1. A power transmission apparatus for a harvester, wherein: a driven shaft that is orientated in a left-right direction and is adjacent to and parallel with an input shaft of a power transmission case; a side-clutch shaft that is orientated in the left-right direction and is provided with a power transmission rotating body that is interlocked with an output rotating body provided on the driven shaft; a selective gear type transmission that subjects power from the input shaft to speed change; and a pair of side clutches that are located coaxially with the side-clutch shaft and individually connect and disconnect power transmission from the power transmission rotating body to left and right travelling apparatuses, are built into the power transmission case, the input shaft is provided on an output shaft provided in an external apparatus that is connected to the power transmission case and the output shaft being orientated in the left-right direction, such that the input shaft rotates about an axial center of the output shaft integrally with the output shaft, and the transmission is configured to transmit power from the input shaft to the driven shaft and is installed so as to span the input shaft and the driven shaft.

2. The power transmission apparatus for a harvester as claimed in claim 1, wherein the power transmission rotating body is disposed on a central portion of the side clutch shaft, and the pair of side clutches are respectively distributed on left and right sides of the power transmission rotating body.

3. The power transmission apparatus for a harvester as claimed in claim 2, wherein the output rotating body is disposed on a central portion of the driven shaft.

4. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 3, wherein a driven gear of the transmission is installed to the driven shaft so as to be adjacent to the output rotating body.

5. The power transmission apparatus for a harvester as claimed in claim 4, wherein the driven gear is installed to the driven shaft so as to be adjacent to both side portions of the output rotating body.

6. The power transmission apparatus for a harvester as claimed in claim 4 or 5, wherein a gear part is provided on one end portion of the driven gear, and a linkage part for gear selection is provided on another end portion of the driven gear, so that the driven gear is configured as a linkage gear that links with a shift mechanism for a gear selection operation, and the linkage gear is installed to the driven shaft such that the gear part is adjacent to the output rotating body.

7. The power transmission apparatus for a harvester as claimed in claim 6, wherein the transmission is configured of a constant mesh type, another linkage gear that is different from the linkage gear that is adjacent to the output rotating body is provided as the linkage gear, each linkage gear is provided with a spline boss part that serves as the linkage part, and the other linkage gear is installed to the driven shaft such that a spline shaft part that rotates integrally with the driven shaft intervenes between the spline boss part of the linkage gear that is adjacent to the output rotating body and the spline boss part of the other linkage gear.

8. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 7, wherein the transmission is provided with a linkage gear that has one end portion that is provided with a linkage part that links with a shift mechanism for a gear selection operation, and the linkage gear is installed to the input shaft or the driven shaft such that the linkage part is located on an end portion of the input shaft or the driven shaft, the end portion being on an opposite side to an input-side end portion of the input shaft or the driven shaft.

9. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 8, wherein the transmission is provided with a linkage gear that links with a shift mechanism for a gear selection operation, one of the input shaft and the driven shaft is disposed below the other, and the linkage gear is installed to one of the input shaft and the driven shaft that is located below the other.

10. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 9, wherein the transmission is configured of a constant mesh type having a plurality of linkage gears each having one end portion provided with a spline boss part, the spline boss part serving as the linkage part that links with a shift mechanism for a gear selection operation, the input shaft or the driven shaft to which the plurality of linkage gears are installed so as to be relatively rotatable is provided with spline shaft parts that are located on an adjacent portion that is adjacent to the spline boss parts and that realizes linkage with the adjacent spline boss parts via the shift mechanism such that the spline shaft parts rotate integrally with the input shaft or the driven shaft, and of the spline shaft parts on the adjacent portion, a predetermined spline shaft part that is to be linked with one of the linkage gears is configured from a spline boss that is detachably fitted onto the input shaft or the driven shaft, with a plurality of splines for linkage being formed only on a portion of an outer circumferential surface of the predetermined spline shaft part on a side of one end thereof.

11. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 10, wherein the power transmission case is provided with an opening from which an end portion of the input shaft on an opposite side to an input-side end portion is exposed.

12. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 11, comprising: an oil channel, via which linkage gears that are linked with a shift mechanism for a gear selection operation in the transmission, are supplied with oil, which is caused to return to an inside of the power transmission case from a hydraulic apparatus.

13. The power transmission apparatus for a harvester as claimed in any one of claims 1 to 12, comprising: left and right travelling drive shafts each orientated in the left-right direction and extending from the power transmission case to the corresponding travelling apparatus; and left and right deceleration mechanisms each achieving deceleration transmission of power received via the corresponding side clutch to the travelling drive shafts.

14. The power transmission apparatus for a harvester as claimed in claim 13, comprising: a relay shaft that is orientated in the left-right direction and is located between the side clutch shaft and the left and right travelling drive shafts, wherein the left and right deceleration mechanisms are each provided with a first deceleration part that extends from the side-clutch shaft to the relay shaft and a second deceleration part that extends from the relay shaft to the travelling drive shaft.

15. The power transmission apparatus for a harvester as claimed in claim 14, wherein the first deceleration part and the second deceleration part are each configured of a gear transmission type that cause a pair of gears to engage with and interlocked with each other, and the relay shaft is disposed at a position that is on a front side of and above the travelling drive shafts, and the side-clutch shaft is disposed at a position that is on a rear side of and above the relay shaft.

16. The power transmission apparatus for a harvester as claimed in claim 15, wherein the output rotating body and the power transmission rotating body are configured from gears by which the output rotating body and the power transmission rotating body are engaged and interlocked with each other, and the driven shaft is disposed at a position that is on a front side of and above the side-clutch shaft, and the input shaft is disposed at a position that is on a rear side of and above the driven shaft.

17. The power transmission apparatus for a harvester as claimed in claim 16, wherein the side clutch shaft is disposed at a position that is on the rear side of the input shaft and the travelling drive shafts.

18. The power transmission apparatus for a harvester as claimed in claim 16 or 17, wherein the relay shaft is disposed at a position that is on the front side of the driven shaft.

19. A power transmission apparatus for a working apparatus, wherein a pair of interlocked rotating bodies that are individually interlocked and connected with left and right travelling apparatuses, and a pair of side clutches that individually connect and disconnect power transmission to the pair of interlocked rotating bodies, are installed coaxially with a side clutch shaft that is built into a power transmission case so as to be orientated in a left-right direction, the pair of side clutches are each configured from: a cylindrical shaft that is fitted onto the side clutch shaft so as to be attachable to and detachable from the side clutch shaft by sliding in a direction along an axial center of the side clutch shaft and so as to be relatively rotatable; a moving-side rotating body provided with a locking part on one side edge thereof; a fixed-side rotating body provided with a locked part on one side edge thereof; a compression spring that biases the moving-side rotating body toward an ON position at which the locking part and the locked part engage with each other; a stopper that receives the moving-side rotating body at the ON position; and a spring receiver that receives one end portion of the compression spring, and in each of the pair of side clutches, the moving-side rotating body, the compression spring, the stopper, and the spring receiver are installed to an outer circumferential portion of the cylindrical shaft such that the moving-side rotating body and the compression spring are located between the stopper and the spring receiver, and such that the moving-side rotating body is slidable in the direction along the axial center of the side clutch shaft and is rotatable integrally with the cylindrical shaft, and the cylindrical shaft, the moving-side rotating body, the compression spring, the stopper, and the spring receiver are configured as a sliding unit that slides along the side-clutch shaft integrally with each other in the direction along the axial center of the side-clutch shaft so as to be attachable to and detachable from the side-clutch shaft.

20. The power transmission apparatus for a working apparatus as claimed in claim 19, wherein a power transmission rotating body that transmits power to the pair of interlocked rotating bodies via the pair of side clutches is disposed on a central portion of the side-clutch shaft, and the pair of interlocked rotating bodies, as well as the pair of side clutches, are distributed on left and right sides of the power transmission rotating body, and each of the pair of side clutches is thus configured to connect and disconnect power to the corresponding interlocked rotating body on a same side in the left-right direction from the power transmission rotating body.

21. The power transmission apparatus for a working apparatus as claimed in claim 19 or 20, wherein each of the pair of side clutches is configured such that the moving-side rotating body serves as a driven-side rotating body and the fixed-side rotating body serves as a driving-side rotating body, and each of the sliding units is configured to be provided with the corresponding interlocked rotating body as one constituent part.

22. The power transmission apparatus for a working apparatus as claimed in claim 20, wherein the power transmission case is provided with openings that are respectively located in positions that face the pair of side clutches in the direction along the axial center of the side-clutch shaft and allow the sliding units to pass through, covering members that respectively close the openings are detachably installed, and each sliding unit is configured to be attachable to and detachable from the side-clutch shaft from an outside of the power transmission case.

23. The power transmission apparatus for a working apparatus as claimed in claim 22, wherein each of the covering members is provided with a shaft supporting part that supports an end portion of the side-clutch shaft.

24. The power transmission apparatus for a working apparatus as claimed in claim 22 or 23, wherein each of the fixed-side rotating bodies is fitted onto the side-clutch shaft so as to be attachable to and detachable from the side-clutch shaft by sliding in the direction along the axial center of the side-clutch shaft, and each of the openings is formed to have a size that allows the fixed-side rotating body to pass through.

25. The power transmission apparatus for a working apparatus as claimed in claim 24, wherein each of the pair of side clutches is provided with a spur gear, which serves as the fixed-side rotating body and has a face width that is greater than or equal to twice a length of a path of contact with the locking part of the moving-side rotating body.

26. The power transmission apparatus for a working apparatus as claimed in claim 24 or 25, wherein each of the fixed-side rotating bodies is fitted onto a portion of the side-clutch shaft that is closer to a shaft end than the sliding unit is.

27. The power transmission apparatus for a working apparatus as claimed in any one of claims 22 to 26, wherein driving gears are provided as the pair of interlocked rotating bodies, and each of the side clutches is configured such that the moving-side rotating body serves as a driven-side rotating body and the fixed-side rotating body serves as a driving-side rotating body, and each of the sliding units is configured to be provided with the corresponding driving gear as one constituent part.

28. The power transmission apparatus for a working apparatus as claimed in claim 27, wherein each of the sliding units is provided with the driving gear that is located on the cylindrical shaft.

29. The power transmission apparatus for a working apparatus as claimed in claim 27 or 28, wherein the power transmission case is provided with multi-plate type side brakes, each of which brakes the corresponding travelling apparatus and is installed to an outer circumferential side of the corresponding sliding unit so as to be coaxial with the side-clutch shaft, and each of the sliding units is provided with a brake hub of the corresponding side brake such that the brake hub, which serves as one constituent part, rotates integrally with the cylindrical shaft.

30. The power transmission apparatus for a working apparatus as claimed in claim 29, wherein each of the sliding units is provided with a spline boss that rotates integrally with the cylindrical shaft, and each of the spline bosses is configured as a dual-purpose part, of which one end portion serves as the driving gear and the other end portion serves as the brake hub.

31. The power transmission apparatus for a working apparatus as claimed in claim 30, wherein in each of the spline bosses, an inner circumferential surface on a driving gear side is provided with a spline hole part that is fitted onto a spline shaft part provided on one end portion of the corresponding cylindrical shaft, and an inner circumferential surface on a brake hub side is provided with an enlarged-diameter part due to which a housing space for the compression spring is formed between the enlarged-diameter part and the cylindrical shaft.

32. The power transmission apparatus for a working apparatus as claimed in claim 31, wherein in each of the cylindrical shafts, the spring receiver is configured with a level-difference part provided on an outer circumferential portion of the cylindrical shaft, and the spline shaft part thereof is formed to have a length from the level-difference part to a shaft end on a large-diameter side, each of the spline shaft parts is provided with an engagement part, which is formed as a substantially ring-shaped recess in an outer circumferential side of the spline shaft part, and a C-shaped stopper ring is fitted onto the engagement part, and in each of the spline bosses, the spline hole part thereof is formed to have a length from the stopper ring to the level-difference part, and the enlarged-diameter part is formed to have a length from the level-difference part to a boss end on the brake hub side.

33. The power transmission apparatus for a working apparatus as claimed in any one of claims 29 to 32, wherein each of the side brakes is provided with a plurality of brake discs and a plurality of separator plates, which are arranged one after another in the direction along the axial center of the side-clutch shaft so as to be detachable outward in the left-right direction of the power transmission case by sliding in the direction along the axial center of the side-clutch shaft, and each of the openings is formed to have a size that allows the brake discs and the separator plates to pass through.

34. The power transmission apparatus for a working apparatus as claimed in claim 33, wherein each of the moving-side rotating bodies is provided with a pressing part, which is formed on an outer circumferential portion thereof and acts on the brake discs and the separator plates, and each of the side brakes is configured such that the brake discs and the separator plates are each shifted from a braking release state, in which the brake discs and the separator plates each release pressure contact due to an effect of the pressing part, to a braking state, in which the brake discs and the separator plates each have pressure contact due to an effect of the pressing part, along with the corresponding moving-side rotating body sliding from an OFF position, in which the locking part of the moving-side rotating body and the locked part of the fixed-side rotating body release engagement, toward a braking position, which is located in an opposite direction from an ON position, and such that the brake discs and the separator plates are each shifted from the braking state to the braking release state, along with the corresponding moving-side rotating body sliding from the braking position to the OFF position.

35. The power transmission apparatus for a working apparatus as claimed in claim 33 or 34, wherein each of the fixed-side rotating bodies is fitted onto a portion of the side-clutch shaft that is closer to the shaft end than the sliding unit is, so as to be attachable to and detachable from the side-clutch shaft by sliding in the direction along the axial center of the side-clutch shaft, and each of the covering members is provided with an auxiliary opening that allows the fixed-side rotating body to pass through, and an auxiliary covering member that closes the auxiliary opening is detachably installed to each covering member, and the auxiliary covering member is provided with the shaft supporting part that supports an end portion of the side-clutch shaft.

36. The power transmission apparatus for a working apparatus as claimed in claim 35, wherein each of the auxiliary openings is formed to have a circular shape centered at the axial center of the side-clutch shaft, each of the auxiliary covering members is provided with a large-diameter part that is fitted into the auxiliary opening, and a small-diameter part due to which a ring-shaped space is formed between the small-diameter part and the auxiliary opening, such that the small-diameter part is located inside the power transmission case, each of the sliding units is installed coaxially with the side-clutch shaft such that the moving-side rotating body thereof faces the space, and a ring-shaped piston that operates to slide the moving-side rotating body is fitted into the space so as to be slidable in the direction along the axial center of the side-clutch shaft, and the space serves as an oil chamber for piston operation.

37. The power transmission apparatus for a working apparatus as claimed in any one of claims 19 to 36, wherein each of the moving-side rotating bodies is provided with an enlarged-diameter part that is located on a stopper side inner circumferential surface thereof and allows entry of the stopper at the ON position.

38. The power transmission apparatus for a working apparatus as claimed in claim 37, wherein the stopper is configured from a C-shaped stopper ring that is detachably fitted onto an engagement groove that is formed as a ring-shaped recess in an outer circumferential side of the cylindrical shaft, and the enlarged-diameter part for the stopper is formed to have a size that prevents the stopper from being detached from the engagement groove.

39. A harvester comprising: a main transmission apparatus that subjects a drive force from an engine to forward and reverse continuously variable speed change; a gear type sub transmission apparatus that is built into a transmission case, that is provided with a gear train that can realize a plurality of combinations, and that subjects the drive force output from the main transmission apparatus to multi-level speed change according to a working condition, and transmits the drive force to a travelling apparatus; a working clutch that connects or disconnects transmission of a drive force to a working part; a main speed-change operation part for causing the main transmission apparatus to perform a speed-change operation; a sub speed-change operation part for causing the sub transmission apparatus to perform a speed-change operation; a clutch operation part for causing an ON/OFF operation of the working clutch; and a restraint mechanism that, when the working clutch is turned ON, restrains the main speed-change operation part from being operated to an acceleration side from a predetermined instruction position on a forward travel operation pathway of the main speed-change operation part.

40. The harvester as claimed in claim 39, wherein even when the working clutch is turned ON, the main speed-change operation part is operable between the predetermined instruction position and an intermediate position on the forward travel operation pathway, and along a reversing travel operation pathway.

41. The harvester as claimed in claim 39 or 40, wherein the predetermined instruction position is set be located on an acceleration side of the intermediate position on the forward travel operation pathway.

42. The harvester as claimed in any one of claims 39 to 41, wherein the sub transmission apparatus is shiftable to two states that are a high-speed speed-change state and a low-speed speed-change state, and the restrain mechanism restrains the main speed-change operation part from being operated to the acceleration side of the predetermined instruction position on the forward travel operation pathway when the working clutch has been operated to turn ON, regardless of whether the sub transmission apparatus has been operated to enter the high-speed speed-change state or the low-speed speed-change state.

43. The harvester as claimed in any one of claims 39 to 41, wherein the sub transmission apparatus is shiftable to two states that are a high-speed speed-change state and a low-speed speed-change state, and the restrain mechanism restrains the main speed-change operation part from being operated to the acceleration side of the predetermined instruction position on the forward travel operation pathway when the working clutch has been operated to turn ON in a situation where the sub transmission apparatus has been operated to enter the high-speed speed-change state.

44. The harvester as claimed in any one of claims 39 to 43, wherein a front-rear swing operation type main speed-change lever is provided as the main speed-change operation part and a front-rear swing operation type clutch lever is provided as the clutch operation part, the restraint mechanism is provided with a restraint part that is capable of protruding to and retreating from the forward travel operation pathway, and a linkage part that links the restraint part and the clutch lever with each other, and the restraint part protrudes to a position that corresponds to the predetermined instruction position on the forward travel operation pathway when the clutch lever is operated to a clutch ON position.

45. The harvester as claimed in claim 44, wherein the main speed-change lever is provided on a side panel of an operation part, the clutch lever is provided on a rear side of the main speed-change lever on the side panel, and the restraint part is slidable in a front-rear direction, and retreats to a front side of the forward travel operation pathway when the clutch lever is operated to a clutch OFF position.

46. The harvester as claimed in claim 44, wherein a restriction part that restricts the clutch lever from moving from the clutch ON position to an opposite side to the clutch OFF position is provided, the linkage part is provided with: an arm member that swings about a swing axial center of the clutch lever integrally with the clutch lever; and a rod member having one end that is linked with the arm member so as to be rotatable about a first axial center and another end that is linked with the restraint part so as to be rotatable about a second axial center; and the linkage part is configured such that when the clutch lever is operated from a clutch OFF position to the clutch ON position, the first axial center passes by a rear side of the swing axial center, and a straight line connecting the first axial center and the second axial center crosses over the swing axial center, in a view in a direction along the swing axial center.

47. The harvester as claimed in any one of claims 44 to 46, wherein the restraint part is provided with a guide member that is located apart from the forward travel operation pathway, extends along the forward travel operation pathway, and is slidable along a front-rear direction, a supporting bracket is provided in two different positions along the front-rear direction, and the guide member is supported by the supporting bracket.

48. The harvester as claimed in claim 47, wherein the supporting bracket is provided with two through holes respectively located in two different positions along the front-rear direction, and the guide member passes through and is supported at the through holes.

49. The harvester as claimed in claim 47 or 48, wherein the restraint part is provided with a protruding member that is provided on a tip portion of the guide member, and that is able to protrude to the forward travel operation pathway, another supporting bracket that is different from the supporting bracket is provided, an elongated hole that the protruding member passes through and that allows the protruding member to slide in a front-rear direction is formed in the other supporting bracket, and the other supporting bracket is provided on an opposite side of the supporting bracket with respect to the forward travel operation pathway.

50. The harvester as claimed in any one of claims 39 to 49, wherein the working part is a reaping part, and the working clutch is a reaping clutch.

51. The harvester as claimed in any one of claims 39 to 50, wherein the main transmission apparatus is a hydraulic static continuously variable transmission apparatus.

WE CLAIM :
1. A power transmission apparatus for a harvester, wherein:
a driven shaft that is orientated in a left-right direction and is adjacent to and parallel with an input shaft of a power transmission case; a side-clutch shaft that is orientated in the left-right direction and is provided with a power transmission rotating body that is interlocked with an output rotating body provided on the driven shaft; a selective gear type transmission that subjects power from the input shaft to speed change; and a pair of side clutches that are located coaxially with the side-clutch shaft and individually connect and disconnect power transmission from the power transmission rotating body to left and right travelling apparatuses, are built into the power transmission case,
the input shaft is provided on an output shaft provided in an external apparatus that is connected to the power transmission case and the output shaft being orientated in the left-right direction, such that the input shaft rotates about an axial center of the output shaft integrally with the output shaft, and
the transmission is configured to transmit power from the input shaft to the driven shaft and is installed so as to span the input shaft and the driven shaft.
2. The power transmission apparatus for a harvester as claimed in claim 1,
wherein
the power transmission rotating body is disposed on a central portion of the side clutch shaft, and
the pair of side clutches are respectively distributed on left and right sides of the power transmission rotating body.
3. The power transmission apparatus for a harvester as claimed in claim 2,
wherein
the output rotating body is disposed on a central portion of the driven shaft.
4. The power transmission apparatus for a harvester as claimed in any one
of claims 1 to 3, wherein
a driven gear of the transmission is installed to the driven shaft so as to be adjacent to the output rotating body.
5. The power transmission apparatus for a harvester as claimed in claim 4,
wherein

the driven gear is installed to the driven shaft so as to be adjacent to both side portions of the output rotating body.
6. The power transmission apparatus for a harvester as claimed in claim 4
or 5, wherein
a gear part is provided on one end portion of the driven gear, and a linkage part for gear selection is provided on another end portion of the driven gear, so that the driven gear is configured as a linkage gear that links with a shift mechanism for a gear selection operation, and
the linkage gear is installed to the driven shaft such that the gear part is adjacent to the output rotating body.
7. The power transmission apparatus for a harvester as claimed in claim 6,
wherein
the transmission is configured of a constant mesh type, another linkage gear that is different from the linkage gear that is adjacent to the output rotating body is provided as the linkage gear,
each linkage gear is provided with a spline boss part that serves as the linkage part, and
the other linkage gear is installed to the driven shaft such that a spline shaft part that rotates integrally with the driven shaft intervenes between the spline boss part of the linkage gear that is adjacent to the output rotating body and the spline boss part of the other linkage gear.
8. The power transmission apparatus for a harvester as claimed in any one
of claims 1 to 7, wherein
the transmission is provided with a linkage gear that has one end portion that is provided with a linkage part that links with a shift mechanism for a gear selection operation, and
the linkage gear is installed to the input shaft or the driven shaft such that the linkage part is located on an end portion of the input shaft or the driven shaft, the end portion being on an opposite side to an input-side end portion of the input shaft or the driven shaft.
9. The power transmission apparatus for a harvester as claimed in any one
of claims 1 to 8, wherein
the transmission is provided with a linkage gear that links with a shift mechanism for a gear selection operation,

one of the input shaft and the driven shaft is disposed below the other, and
the linkage gear is installed to one of the input shaft and the driven shaft that is located below the other.
10. The power transmission apparatus for a harvester as claimed in any one
of claims 1 to 9, wherein
the transmission is configured of a constant mesh type having a plurality of linkage gears each having one end portion provided with a spline boss part, the spline boss part serving as the linkage part that links with a shift mechanism for a gear selection operation,
the input shaft or the driven shaft to which the plurality of linkage gears are installed so as to be relatively rotatable is provided with spline shaft parts that are located on an adjacent portion that is adjacent to the spline boss parts and that realizes linkage with the adjacent spline boss parts via the shift mechanism such that the spline shaft parts rotate integrally with the input shaft or the driven shaft, and
of the spline shaft parts on the adjacent portion, a predetermined spline shaft part that is to be linked with one of the linkage gears is configured from a spline boss that is detachably fitted onto the input shaft or the driven shaft, with a plurality of splines for linkage being formed only on a portion of an outer circumferential surface of the predetermined spline shaft part on a side of one end thereof.
11. The power transmission apparatus for a harvester as claimed in any one
of claims 1 to 10, wherein
the power transmission case is provided with an opening from which an end portion of the input shaft on an opposite side to an input-side end portion is exposed.
12. The power transmission apparatus for a harvester as claimed in any one
of claims 1 to 11, comprising:
an oil channel, via which linkage gears that are linked with a shift mechanism for a gear selection operation in the transmission, are supplied with oil, which is caused to return to an inside of the power transmission case from a hydraulic apparatus.
13. The power transmission apparatus for a harvester as claimed in any one

of claims 1 to 12, comprising:
left and right travelling drive shafts each orientated in the left-right direction and extending from the power transmission case to the corresponding travelling apparatus;
and left and right deceleration mechanisms each achieving deceleration transmission of power received via the corresponding side clutch to the travelling drive shafts.
14. The power transmission apparatus for a harvester as claimed in claim 13,
comprising:
a relay shaft that is orientated in the left-right direction and is located between the side clutch shaft and the left and right travelling drive shafts, wherein
the left and right deceleration mechanisms are each provided with a first deceleration part that extends from the side-clutch shaft to the relay shaft and a second deceleration part that extends from the relay shaft to the travelling drive shaft.
15. The power transmission apparatus for a harvester as claimed in claim 14,
wherein
the first deceleration part and the second deceleration part are each configured of a gear transmission type that cause a pair of gears to engage with and interlocked with each other, and
the relay shaft is disposed at a position that is on a front side of and above the travelling drive shafts, and the side-clutch shaft is disposed at a position that is on a rear side of and above the relay shaft.
16. The power transmission apparatus for a harvester as claimed in claim 15,
wherein
the output rotating body and the power transmission rotating body are configured from gears by which the output rotating body and the power transmission rotating body are engaged and interlocked with each other, and
the driven shaft is disposed at a position that is on a front side of and above the side-clutch shaft, and the input shaft is disposed at a position that is on a rear side of and above the driven shaft.
17. The power transmission apparatus for a harvester as claimed in claim 16,
wherein

the side clutch shaft is disposed at a position that is on the rear side of the input shaft and the travelling drive shafts.
18. The power transmission apparatus for a harvester as claimed in claim 16
or 17, wherein
the relay shaft is disposed at a position that is on the front side of the driven shaft.
19. A power transmission apparatus for a working apparatus, wherein
a pair of interlocked rotating bodies that are individually interlocked and connected with left and right travelling apparatuses, and a pair of side clutches that individually connect and disconnect power transmission to the pair of interlocked rotating bodies, are installed coaxially with a side clutch shaft that is built into a power transmission case so as to be orientated in a left-right direction,
the pair of side clutches are each configured from: a cylindrical shaft that is fitted onto the side clutch shaft so as to be attachable to and detachable from the side clutch shaft by sliding in a direction along an axial center of the side clutch shaft and so as to be relatively rotatable; a moving-side rotating body provided with a locking part on one side edge thereof; a fixed-side rotating body provided with a locked part on one side edge thereof; a compression spring that biases the moving-side rotating body toward an ON position at which the locking part and the locked part engage with each other; a stopper that receives the moving-side rotating body at the ON position; and a spring receiver that receives one end portion of the compression spring, and
in each of the pair of side clutches, the moving-side rotating body, the compression spring, the stopper, and the spring receiver are installed to an outer circumferential portion of the cylindrical shaft such that the moving-side rotating body and the compression spring are located between the stopper and the spring receiver, and such that the moving-side rotating body is slidable in the direction along the axial center of the side clutch shaft and is rotatable integrally with the cylindrical shaft, and the cylindrical shaft, the moving-side rotating body, the compression spring, the stopper, and the spring receiver are configured as a sliding unit that slides along the side-clutch shaft integrally with each other in the direction along the axial center of the side-clutch shaft so as to be attachable to and detachable from the side-clutch shaft.
20. The power transmission apparatus for a working apparatus as claimed in

claim 19, wherein
a power transmission rotating body that transmits power to the pair of interlocked rotating bodies via the pair of side clutches is disposed on a central portion of the side-clutch shaft, and
the pair of interlocked rotating bodies, as well as the pair of side clutches, are distributed on left and right sides of the power transmission rotating body, and each of the pair of side clutches is thus configured to connect and disconnect power to the corresponding interlocked rotating body on a same side in the left-right direction from the power transmission rotating body.
21. The power transmission apparatus for a working apparatus as claimed in
claim 19 or 20, wherein
each of the pair of side clutches is configured such that the moving-side rotating body serves as a driven-side rotating body and the fixed-side rotating body serves as a driving-side rotating body, and each of the sliding units is configured to be provided with the corresponding interlocked rotating body as one constituent part.
22. The power transmission apparatus for a working apparatus as claimed in
claim 20, wherein
the power transmission case is provided with openings that are respectively located in positions that face the pair of side clutches in the direction along the axial center of the side-clutch shaft and allow the sliding units to pass through, covering members that respectively close the openings are detachably installed, and each sliding unit is configured to be attachable to and detachable from the side-clutch shaft from an outside of the power transmission case.
23. The power transmission apparatus for a working apparatus as claimed in
claim 22, wherein
each of the covering members is provided with a shaft supporting part that supports an end portion of the side-clutch shaft.
24. The power transmission apparatus for a working apparatus as claimed in
claim 22 or 23, wherein
each of the fixed-side rotating bodies is fitted onto the side-clutch shaft so as to be attachable to and detachable from the side-clutch shaft by sliding in the direction along the axial center of the side-clutch shaft, and
each of the openings is formed to have a size that allows the fixed-side

rotating body to pass through.
25. The power transmission apparatus for a working apparatus as claimed in
claim 24, wherein
each of the pair of side clutches is provided with a spur gear, which serves as the fixed-side rotating body and has a face width that is greater than or equal to twice a length of a path of contact with the locking part of the moving-side rotating body.
26. The power transmission apparatus for a working apparatus as claimed in
claim 24 or 25, wherein
each of the fixed-side rotating bodies is fitted onto a portion of the side-clutch shaft that is closer to a shaft end than the sliding unit is.
27. The power transmission apparatus for a working apparatus as claimed in
any one of claims 22 to 26, wherein
driving gears are provided as the pair of interlocked rotating bodies, and each of the side clutches is configured such that the moving-side rotating body serves as a driven-side rotating body and the fixed-side rotating body serves as a driving-side rotating body, and each of the sliding units is configured to be provided with the corresponding driving gear as one constituent part.
28. The power transmission apparatus for a working apparatus as claimed in
claim 27, wherein
each of the sliding units is provided with the driving gear that is located on the cylindrical shaft.
29. The power transmission apparatus for a working apparatus as claimed in
claim 27 or 28, wherein
the power transmission case is provided with multi-plate type side brakes, each of which brakes the corresponding travelling apparatus and is installed to an outer circumferential side of the corresponding sliding unit so as to be coaxial with the side-clutch shaft, and
each of the sliding units is provided with a brake hub of the corresponding side brake such that the brake hub, which serves as one constituent part, rotates integrally with the cylindrical shaft.
30. The power transmission apparatus for a working apparatus as claimed in

claim 29, wherein
each of the sliding units is provided with a spline boss that rotates integrally with the cylindrical shaft, and
each of the spline bosses is configured as a dual-purpose part, of which one end portion serves as the driving gear and the other end portion serves as the brake hub.
31. The power transmission apparatus for a working apparatus as claimed in
claim 30, wherein
in each of the spline bosses, an inner circumferential surface on a driving gear side is provided with a spline hole part that is fitted onto a spline shaft part provided on one end portion of the corresponding cylindrical shaft, and an inner circumferential surface on a brake hub side is provided with an enlarged-diameter part due to which a housing space for the compression spring is formed between the enlarged-diameter part and the cylindrical shaft.
32. The power transmission apparatus for a working apparatus as claimed in
claim 31, wherein
in each of the cylindrical shafts, the spring receiver is configured with a level-difference part provided on an outer circumferential portion of the cylindrical shaft, and the spline shaft part thereof is formed to have a length from the level-difference part to a shaft end on a large-diameter side,
each of the spline shaft parts is provided with an engagement part, which is formed as a substantially ring-shaped recess in an outer circumferential side of the spline shaft part, and a C-shaped stopper ring is fitted onto the engagement part, and
in each of the spline bosses, the spline hole part thereof is formed to have a length from the stopper ring to the level-difference part, and the enlarged-diameter part is formed to have a length from the level-difference part to a boss end on the brake hub side.
33. The power transmission apparatus for a working apparatus as claimed in
any one of claims 29 to 32, wherein
each of the side brakes is provided with a plurality of brake discs and a plurality of separator plates, which are arranged one after another in the direction along the axial center of the side-clutch shaft so as to be detachable outward in the left-right direction of the power transmission case by sliding in the direction along the axial center of the side-clutch shaft, and

each of the openings is formed to have a size that allows the brake discs and the separator plates to pass through.
34. The power transmission apparatus for a working apparatus as claimed in
claim 33, wherein
each of the moving-side rotating bodies is provided with a pressing part, which is formed on an outer circumferential portion thereof and acts on the brake discs and the separator plates, and
each of the side brakes is configured such that the brake discs and the separator plates are each shifted from a braking release state, in which the brake discs and the separator plates each release pressure contact due to an effect of the pressing part, to a braking state, in which the brake discs and the separator plates each have pressure contact due to an effect of the pressing part, along with the corresponding moving-side rotating body sliding from an OFF position, in which the locking part of the moving-side rotating body and the locked part of the fixed-side rotating body release engagement, toward a braking position, which is located in an opposite direction from an ON position, and such that the brake discs and the separator plates are each shifted from the braking state to the braking release state, along with the corresponding moving-side rotating body sliding from the braking position to the OFF position.
35. The power transmission apparatus for a working apparatus as claimed in
claim 33 or 34, wherein
each of the fixed-side rotating bodies is fitted onto a portion of the side-clutch shaft that is closer to the shaft end than the sliding unit is, so as to be attachable to and detachable from the side-clutch shaft by sliding in the direction along the axial center of the side-clutch shaft, and
each of the covering members is provided with an auxiliary opening that allows the fixed-side rotating body to pass through, and an auxiliary covering member that closes the auxiliary opening is detachably installed to each covering member, and the auxiliary covering member is provided with the shaft supporting part that supports an end portion of the side-clutch shaft.
36. The power transmission apparatus for a working apparatus as claimed in
claim 35, wherein
each of the auxiliary openings is formed to have a circular shape centered at the axial center of the side-clutch shaft,
each of the auxiliary covering members is provided with a large-diameter

part that is fitted into the auxiliary opening, and a small-diameter part due to which a ring-shaped space is formed between the small-diameter part and the auxiliary opening, such that the small-diameter part is located inside the power transmission case,
each of the sliding units is installed coaxially with the side-clutch shaft such that the moving-side rotating body thereof faces the space, and
a ring-shaped piston that operates to slide the moving-side rotating body is fitted into the space so as to be slidable in the direction along the axial center of the side-clutch shaft, and the space serves as an oil chamber for piston operation.
37. The power transmission apparatus for a working apparatus as claimed in
any one of claims 19 to 36, wherein
each of the moving-side rotating bodies is provided with an enlarged-diameter part that is located on a stopper side inner circumferential surface thereof and allows entry of the stopper at the ON position.
38. The power transmission apparatus for a working apparatus as claimed in
claim 37, wherein
the stopper is configured from a C-shaped stopper ring that is detachably fitted onto an engagement groove that is formed as a ring-shaped recess in an outer circumferential side of the cylindrical shaft, and
the enlarged-diameter part for the stopper is formed to have a size that prevents the stopper from being detached from the engagement groove.
39. A harvester comprising:
a main transmission apparatus that subjects a drive force from an engine to forward and reverse continuously variable speed change;
a gear type sub transmission apparatus that is built into a transmission case, that is provided with a gear train that can realize a plurality of combinations, and that subjects the drive force output from the main transmission apparatus to multi-level speed change according to a working condition, and transmits the drive force to a travelling apparatus;
a working clutch that connects or disconnects transmission of a drive force to a working part;
a main speed-change operation part for causing the main transmission apparatus to perform a speed-change operation;
a sub speed-change operation part for causing the sub transmission

apparatus to perform a speed-change operation;
a clutch operation part for causing an ON/OFF operation of the working clutch; and
a restraint mechanism that, when the working clutch is turned ON, restrains the main speed-change operation part from being operated to an acceleration side from a predetermined instruction position on a forward travel operation pathway of the main speed-change operation part.
40. The harvester as claimed in claim 39, wherein
even when the working clutch is turned ON, the main speed-change operation part is operable between the predetermined instruction position and an intermediate position on the forward travel operation pathway, and along a reversing travel operation pathway.
41. The harvester as claimed in claim 39 or 40, wherein
the predetermined instruction position is set be located on an acceleration side of the intermediate position on the forward travel operation pathway.
42. The harvester as claimed in any one of claims 39 to 41, wherein
the sub transmission apparatus is shiftable to two states that are a high-speed speed-change state and a low-speed speed-change state, and
the restrain mechanism restrains the main speed-change operation part from being operated to the acceleration side of the predetermined instruction position on the forward travel operation pathway when the working clutch has been operated to turn ON, regardless of whether the sub transmission apparatus has been operated to enter the high-speed speed-change state or the low-speed speed-change state.
43. The harvester as claimed in any one of claims 39 to 41, wherein
the sub transmission apparatus is shiftable to two states that are a high-speed speed-change state and a low-speed speed-change state, and
the restrain mechanism restrains the main speed-change operation part from being operated to the acceleration side of the predetermined instruction position on the forward travel operation pathway when the working clutch has been operated to turn ON in a situation where the sub transmission apparatus has been operated to enter the high-speed speed-change state.

44. The harvester as claimed in any one of claims 39 to 43, wherein
a front-rear swing operation type main speed-change lever is provided as the main speed-change operation part and a front-rear swing operation type clutch lever is provided as the clutch operation part,
the restraint mechanism is provided with a restraint part that is capable of protruding to and retreating from the forward travel operation pathway, and a linkage part that links the restraint part and the clutch lever with each other, and
the restraint part protrudes to a position that corresponds to the predetermined instruction position on the forward travel operation pathway when the clutch lever is operated to a clutch ON position.
45. The harvester as claimed in claim 44, wherein
the main speed-change lever is provided on a side panel of an operation part,
the clutch lever is provided on a rear side of the main speed-change lever on the side panel, and
the restraint part is slidable in a front-rear direction, and retreats to a front side of the forward travel operation pathway when the clutch lever is operated to a clutch OFF position.
46. The harvester as claimed in claim 44, wherein
a restriction part that restricts the clutch lever from moving from the clutch ON position to an opposite side to the clutch OFF position is provided,
the linkage part is provided with: an arm member that swings about a swing axial center of the clutch lever integrally with the clutch lever; and a rod member having one end that is linked with the arm member so as to be rotatable about a first axial center and another end that is linked with the restraint part so as to be rotatable about a second axial center; and
the linkage part is configured such that when the clutch lever is operated from a clutch OFF position to the clutch ON position, the first axial center passes by a rear side of the swing axial center, and a straight line connecting the first axial center and the second axial center crosses over the swing axial center, in a view in a direction along the swing axial center.
47. The harvester as claimed in any one of claims 44 to 46, wherein
the restraint part is provided with a guide member that is located apart from the forward travel operation pathway, extends along the forward travel operation pathway, and is slidable along a front-rear direction,

a supporting bracket is provided in two different positions along the front-rear direction, and
the guide member is supported by the supporting bracket.
48. The harvester as claimed in claim 47, wherein
the supporting bracket is provided with two through holes respectively located in two different positions along the front-rear direction, and
the guide member passes through and is supported at the through holes.
49. The harvester as claimed in claim 47 or 48, wherein
the restraint part is provided with a protruding member that is provided on a tip portion of the guide member, and that is able to protrude to the forward travel operation pathway,
another supporting bracket that is different from the supporting bracket is provided,
an elongated hole that the protruding member passes through and that allows the protruding member to slide in a front-rear direction is formed in the other supporting bracket, and
the other supporting bracket is provided on an opposite side of the supporting bracket with respect to the forward travel operation pathway.
50. The harvester as claimed in any one of claims 39 to 49, wherein
the working part is a reaping part, and the working clutch is a reaping clutch.
51. The harvester as claimed in any one of claims 39 to 50, wherein
the main transmission apparatus is a hydraulic static continuously variable transmission apparatus.