Claims:WE CLAIM:
1. An arrangement(100) for enabling variable speed selection of a tractor, said arrangement(100) comprising:
• an input shaft(14) driven by engine;
• a power takeoff(PTO) shaft(16);
• a shifting fork(10);
• an intermediate shaft(18);
• an idler shaft(20);
• a lever; and
• a set of gears operatively coupled to said input shaft(14), body of said PTO shaft(16), said intermediate shaft(18), and said idler shaft(20);
said lever configured to displace said shifting fork(10) to selectively engage predefined gears of said set of gears to enable preselected speed configurations of the tractor.
2. The arrangement (100) as claimed in claim 1, wherein said set of gears include:
a. a first gear (1) operatively coupled to said input shaft (14);
b. a second gear (2), a third gear (3), a sixth gear (6), and a seventh gear (7) operatively coupled to said PTO shaft (16);
c. a fourth gear (4) and a fifth gear (5) operatively coupled to said intermediate shaft (18); and
d. an eighth gear (8) and a ninth gear (9) operatively coupled on said idler shaft (20).
3. The arrangement (100) as claimed in claim 1, wherein said input shaft (14) is parallel to said PTO shaft (16).
4. The arrangement (100) as claimed in claim 1, wherein said intermediate shaft (18) is located below said input shaft (14) and said PTO shaft (16).
5. The arrangement (100) as claimed in claim 1, wherein said idler shaft (20) is located below said PTO shaft (16).
6. The arrangement (100) as claimed in claim 2, wherein said displacement of said shifting fork (10) enables speed selection between standard speed mode, economical speed mode, high speed mode, and reverse speed mode.
7. The arrangement (100) as claimed in claim 6, wherein said first gear (1) is meshed with said second gear (2) to enable displacement of said sixth gear (6) to overlap said third gear (3) and mesh with said fourth gear (4) and to enable said seventh gear (7) to mesh with said fifth gear (5) to allow power transmission from engine to the PTO shaft and achieve said standard speed mode.
8. The arrangement (100) as claimed in claim 6, wherein said first gear (1) is meshed with said second gear (2) to enable said third gear (3) to mesh with said fourth gear (4) and to cause said fifth gear (5) to mesh with said sixth gear (6) to allow power transmission from engine to the PTO shaft and achieve said economical speed mode.
9. The arrangement (100) as claimed in claim 8, wherein said first gear (1) meshes with said second gear (2) to enable said third gear (3) to mesh with said fourth gear (4) and causes said fifth gear (5) to mesh with said sixth gear (6) to allow the engine speed to increase above the speed of said economic mode and allow power transmission from engine to the PTO shaft (16) and achieve said high speed mode.
10. The arrangement (100) as claimed in claim 6, wherein said first gear (1) is meshed with said second gear (2) to enable said third gear (3) to mesh with said fourth gear (4) to allow said fifth gear (5) to mesh with said eighth gear (8) and allow seventh gear (7) to mesh with said ninth gear (9) to allow power transmission from engine to the PTO shaft (16) and achieve said reverse speed mode.
11. The arrangement (100) as claimed in any one of claims 7 to 10, wherein said sixth (6) and said seventh gear (7) are configured to linearly displace on said PTO shaft (16) via said shifting fork (10) to achieve said standard speed mode, said economic speed mode, said high speed mode, and said reverse speed mode.
12. The arrangement (100) as claimed in claim 2, wherein said first gear (1) meshes with said second gear (2) to enable said third gear (3) to mesh with said fourth gear (4) and allow said fifth gear (5) to mesh with said eighth gear (8) in neutral position of the tractor.
13. The arrangement (100) as claimed in claim 12, wherein said fifth gear (5) and said eighth gear (8) freely rotate upon receiving power from said fourth gear (4).
14. The arrangement (100) as claimed in claim 1, wherein enclosing ends of each of said input shaft (14), said PTO shaft (16), said intermediate shaft (18), and said idler shaft (20) has bearing provided thereon.
15. The arrangement (100) as claimed in claim 2, wherein said sixth gear (6) and said seventh gear (7) are integrated by using a coupler (26).
16. The arrangement (100) as claimed in claim 15, wherein said shifting fork (10) is coupled to said coupler (26).
17. The arrangement (100) as claimed in claim 2, wherein said first gear (1) rotates about said input shaft (14).
18. The arrangement (100) as claimed in claim 2, wherein said second gear (2) and said third gear (3) are coupled and rotate about said PTO shaft (16).
19. The arrangement (100) as claimed in claim 2, wherein said fourth (4) and said fifth gear (5) are coupled and rotate about said intermediate shaft (18).
20. The arrangement (100) as claimed in claim 2, wherein said eighth gear (8) and said ninth gear (9) rotate about said idler shaft (20).
21. The arrangement (100) as claimed in claim 2, wherein said third gear (3) and said sixth gear (6) are spaced apart and independently rotate with respect to each other.
22. The arrangement (100) as claimed in claim 2, wherein rotation of said sixth (6) and seventh gear (6) facilitates rotation of said PTO shaft (16).
Dated this 18th day of March, 2022

_______________________________
MOHAN RAJKUMAR DEWAN, IN/PA – 25
of R.K.DEWAN & CO.
Authorized Agent of Applicant

TO,
THE CONTROLLER OF PATENTS
THE PATENT OFFICE, New Delhi , Description:FIELD
The present disclosure relates to the field of gear arrangements for variable speed selection in vehicles.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Typically, tractor is used not only for pulling the implements for tillage operations and sowing of various crops but also used to power stationery and moving equipment for doing operations such as threshing of crops, pumping water from tube-wells, spraying, rotavator etc. A power outlet is generally provided at the rear end of the tractors. The power outlet is known as power take off (PTO) shaft. The power take off (PTO) shafts in tractors are used to drive different farm equipment by receiving an engine's mechanical power through tractor’s transmission.
Modern tractors for e.g., offer standard PTO output speeds of 540 rpm and 1000 rpm at the rated engine rpm. However, different operations are executed at different PTO speeds and, and when load on the PTO shaft increases the engine rpm tends to decrease and renders the ability of the PTO having two standard speeds to effectively execute various operations at desired speed. Typically, standard PTO speeds are operated at max engine rpm as decided by the tractor manufacturer, therefore, when workload on PTO shaft increases the torque supplied by the fixed engine rpm is not enough to drive the equipment. Further, when the workload on the PTO shaft decreases the torque supplied by engine rpm at fixed maximum speed is inefficient. Moreover, transmissions of tractors are bulky and have complex meshing gear structures which make servicing of the gears difficult.
There is, therefore felt a need of an arrangement that alleviates the aforementioned drawbacks.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
An object of the present disclosure is to provide an arrangement for enabling variable speed selection.
Another object of the present disclosure is to provide an arrangement that enables variable speed selection in a tractor.
Still another object of the present disclosure is to provide an arrangement that is simple in construction.
Yet another object of the present disclosure is to provide an arrangement for enabling variable speed selection that enables a tractor to perform different operations suitable for different equipment at different speeds like rotary tiller, post hole digger, water pump, seed drill, mulching, power harrow, generator and etc.
Still yet another object of the present disclosure is to provide an arrangement for enabling variable speed selection that is compact.
Yet another object of the present disclosure is to provide an arrangement for enabling variable speed selection that has fewer components.
Other objects and advantages of the present disclosure will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure discloses an arrangement for enabling variable speed selection of a tractor. The arrangement comprises an input shaft driven by the engine of the tractor, a power take off (PTO) shaft, a shifting fork, an intermediate shaft, an idler shaft, a shifting fork, a lever, and a set of gears. The set of gears is operatively coupled to the input shaft, body of the PTO shaft, the intermediate shaft, and the idler shaft. The lever is configured to displace the shifting fork to selectively engage predefined gears of the set of gears to enable preselected speed configurations of tractor.
In an embodiment, the set of gears include a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, and a ninth gear. The first gear is operatively coupled to the input shaft. The second gear, the third gear, the sixth gear, and the seventh gear are operatively coupled to the PTO shaft. The fourth gear and the fifth gear are operatively coupled to the intermediate shaft. The eighth gear and the ninth gear are operatively coupled on the idler shaft.
In an embodiment, the input shaft is parallel to the PTO shaft.
In an embodiment, the intermediate shaft is located below the input shaft and the PTO shaft.
In an embodiment, the idler shaft is located below the PTO shaft.
In an embodiment, the arrangement enables speed selection between standard speed mode, economical speed mode, high speed mode, and reverse speed mode.
In an embodiment, the first gear is meshed with the second gear to enable the sixth gear to overlap the third gear and mesh with the fourth gear and to enable said seventh gear to mesh with said fifth gear to allow power transmission from engine to the PTO shaft and achieve said standard speed mode.
In an embodiment, the first gear is meshed with the second gear enable the third gear to mesh with the fourth gear and to cause the fifth gear to mesh with the sixth gear to allow power transmission from engine to the PTO shaft and achieve the economical speed mode.
In an embodiment, the first gear meshes with the second gear to enable the third gear to mesh with the fourth gear and causes the fifth gear to mesh with the sixth gear and the engine speed is increased in a predetermined range above the speed of the economic mode to allow power transmission from engine to the PTO shaft and achieve the high speed mode.
In an embodiment, the first gear is meshed with the second gear to enable the third gear to mesh with the fourth gear, the fifth gear is meshed with the eighth gear, and the seventh gear is meshed with the ninth gear to allow power transmission from engine to the PTO shaft and achieve the reverse speed mode.
In an embodiment, the sixth and the seventh gear are configured to linearly displace on the PTO shaft via the shifting fork to achieve the standard speed mode, the economic speed mode, the high speed mode, and the reverse speed mode.
In an embodiment, the first gear meshes with the second gear to enable the third gear to mesh with the fourth gear, and the fifth gear with the eighth gear in neutral position of the tractor.
In an embodiment, the fifth gear and the eighth gear freely rotate upon receiving power from the fourth gear.
In an embodiment, the enclosing ends of each of the input shaft, the PTO shaft, the intermediate shaft, and the idler shaft has bearing provided thereon.
In an embodiment, the sixth gear and the seventh gear are integrated by using a coupler. In an embodiment, the shifting fork is coupled to the coupler.
In an embodiment, the first gear rotates about the input shaft.
In an embodiment, the second gear and the third gear are coupled to each other and rotate about the PTO shaft.
In an embodiment, the fourth and the fifth gear are coupled with each other and rotate about the intermediate shaft.
In an embodiment, the eighth gear and the ninth gear rotate about the idler shaft.
In an embodiment, the third gear and the sixth gear are spaced apart and independently rotate with respect to each other.
In an embodiment, the rotation of the sixth and seventh gear facilitates rotation of the PTO shaft.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
An arrangement for enabling variable speed selection of the present disclosure will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates a front isometric view of the arrangement for enabling variable speed selection;
Figure 2 illustrates a rear isometric view of the arrangement of Figure 1;
Figure 3 illustrates an isometric view of a shifting fork and gears coupled to the power take off (PTO) of the arrangement of Figure 1;
Figure 4 illustrates an isometric view of the arrangement of Figure 1 depicting gears meshed in neutral mode;
Figure 5 illustrates an isometric view of the arrangement of Figure 1 depicting gears meshed in economic speed mode and in high speed mode; and
Figure 6 illustrates an isometric view of the arrangement of Figure 1 depicting gears meshed in reverse mode power take off (PTO).
LIST OF REFERENCE NUMERALS
100 – Arrangement for enabling variable speed selection
1 – First gear
2 – Second gear
3 – Third gear
4 – Fourth gear
5 – Fifth gear
6 – Sixth gear
7 – Seventh gear
8 – Eighth gear
9 – Ninth gear
10 – Shifting fork
11 – Shifting rod
14 – Input shaft
16 – Power take-off (PTO) shaft
18 – Intermediate shaft
20 – Idler shaft
24 – Bearing
26 – Coupler
DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
Terms such as “inner,” “outer,” "beneath," "below," "lower," "above," "upper," and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, operations, elements and/or components, but do not forbid the presence or addition of one or more other features, operations, elements, components, and/or groups thereof.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
The present disclosure discloses an arrangement 100 for enabling variable speed selection of a tractor. The arrangement 100 (hereinafter referred to as “arrangement 100”) for variable speed selection of a tractor will now be described with reference to Figure 1 through Figure 6.
Figure 1 and Figure 2 depict the arrangement 100 comprising an input shaft 14 driven by the engine of the tractor, a power take off (PTO) shaft 16, a shifting fork 10, an intermediate shaft 18, an idler shaft 20, a lever (not shown in Figures), and a set of gears. The PTO shaft 16 is disposed parallel to the input shaft 14. The intermediate shaft 18 is disposed below the input shaft 14 and the PTO shaft 16. The idler shaft 20 is disposed below the PTO shaft 16.
The set of gears is operatively coupled to the input shaft 14, body of the PTO shaft 16, the intermediate shaft 18, and the idler shaft 20. The lever (not shown in Figures) is configured to displace the shifting fork 10 along with the shifting rod 11 to selectively engage predefined gears of the set of gears to enable preselected speed configurations of the tractor.
In an embodiment, the set of gears include a first gear 1, a second gear 2, a third gear 3, a fourth gear 4, a fifth gear 5, a sixth gear 6, a seventh gear 7, an eighth gear 8, and a ninth gear 9.
The first gear 1 is operatively coupled to the input shaft 14. The second gear 2, the third gear 3, the sixth gear 6, and the seventh gear 7 are operatively coupled to the PTO shaft 16. The fourth gear 4 and the fifth gear 5 are operatively coupled to the intermediate shaft 18. The eighth gear 8 and the ninth gear 9 are operatively coupled on the idler shaft 9.
In an embodiment, the enclosing ends of each of the input shaft 14, the PTO shaft 16, the intermediate shaft 18, and the idler shaft 20 have bearing 24 provided thereon.
In an embodiment, the first gear 1 rotates about the input shaft 14. In an embodiment, the second gear 2 and the third gear 3 are coupled to each other and rotate about the PTO shaft 16. The rotation of second gear 2 enables the rotation of the third gear 3. In an embodiment, the fourth 4 and the fifth gear 5 are coupled with each other and rotate about the intermediate shaft 18. In an embodiment, the rotation of the sixth gear 6 and seventh gear 7 facilitate the rotation of the PTO shaft 16 at the preselected speed configuration of the tractor. In an embodiment, the eighth gear 8 and the ninth gear 9 rotate about the idler shaft 20.
In an embodiment, the third gear 3 and the sixth gear 6 are spaced apart and independently rotate with respect to each other.
In an embodiment, upon operation of the lever (not shown in figures) the sixth gear 6 and the seventh gear 7 are integrated by using a coupler 26. In an embodiment, the shifting fork 10 is coupled to the coupler 26 to facilitate displacement of the sixth gear 6 and the seventh gear 7 and allow variable speed selection of the tractor (refer Figure 3).
The arrangement 100 enables speed selection between standard speed mode, economical speed mode, high speed mode, and reverse speed mode (refer Figures 4 to Figure 6).
Figure 4 depicts the meshing of gears in the neutral position of the tractor. In the neutral position, the first gear 1 meshes with the second gear 2 to enable the rotation of the third gear 3. The rotation of the third gear 3 allows meshing of third gear 3 with the fourth gear 4. Meshing of third gear 3 with the fourth gear 4 allows rotation of the fifth gear 5 to allow meshing of the fifth gear 5 with the eighth gear 8. In neutral mode, the fifth gear 5 and eighth gear 8 freely rotate they do not transmit any power to the PTO shaft 16.
The operation of the lever (not shown in figures) causes the displacement of the shifting fork 10 first gear 1 is meshed with the second gear 2 to enable the sixth gear 6 to overlap the third gear 3 and mesh with the fourth gear 4. The meshing of sixth gear 6 with the fourth gear 4 causes the fifth gear 5 to mesh with the seventh gear 7 to transmit power from engine to the PTO shaft 16 and achieve the standard speed mode of the tractor. During the standard speed mode, the PTO shaft 16 rotates at 540 revolutions per minute (RPM) at the engine speed of 2600 RPM.
Figure 5 depicts economic speed mode of the tractor. The operation of the lever causes displacement of the shifting fork 10 and the sixth 6 and seventh gear 7 to allow power from the engine to transmit to the input shaft 14 receives power from the engine (not shown in figures) and the first gear 1 is meshed with the second gear 2. The rotation of the second gear 2 enables the third gear 3 to mesh with the fourth gear 4. The rotation of the fourth gear 4 causes the fifth gear 5 to rotate and mesh with the sixth gear 6 to achieve the economical speed mode. During the economical speed mode, the PTO shaft 16 rotates at 750 revolutions per minute (RPM) at the engine speed of 2600 RPM.
Further, in the high speed mode of the tractor, when the lever is operated, the shifting fork 10 shifts the sixth 6 and seventh gear 7 to allow the first gear 1 to mesh with the second gear 2 to enable the third gear 3 to mesh with the fourth gear 4. The meshing of third gear 3 with the fourth gear 4 allows the fifth gear 5 to mesh with the sixth gear 6 to achieve the high speed mode of the tractor. The high speed mode has similar meshing of the gears as in the economical speed mode. In the high speed mode, only the engine speed is increased and the power is received at high speed to the PTO shaft 16. During the high speed mode, the PTO shaft 16 rotates at 750 revolutions per minute (RPM) at the engine speed of 2800 RPM.
Figure 6 depicts the arrangement 100 in reverse speed PTO mode. The operation of the lever causes displacement of the shifting fork 10 and the sixth 6 and seventh gear 7 to allow the first gear 1 to mesh with the second gear 2 to enable the rotation of the third gear 3. The rotation of the third gear 3 allows meshing with the fourth gear 4, which further enables meshing of the fifth gear 5 with the eighth gear 8 and simultaneously the seventh gear 7 is meshed with the ninth gear 9 to transmit power from engine to the PTO shaft 16 and achieve the reverse speed mode of the tractor.
In an operative configuration, when an operator operates the lever to achieve standard speed mode, the operation of the lever causes the displacement of the shifting fork 10 along with the sixth gear 6 and the seventh gear 7 to allow the first gear 1 to mesh with the second gear 2. The second gear 2 rotates and enables the sixth gear 6 to overlap the third gear 3 to mesh with the fourth gear 4. The meshing of sixth gear 6 with the fourth gear 4 causes the fifth gear 5 to mesh with the seventh gear 7 to transmit power from engine to the PTO shaft 16 and achieve the standard speed mode of the tractor.
Further, when the operator operates the lever to achieve the economical speed mode or the high speed mode, the shifting fork 10 along with the sixth gear 6 and the seventh gear 7 is displaced to allow the first gear 1 to mesh with the second gear 2 to rotate the second gear 2. Further, the rotation of the second gear 2 allows rotation of the third gear 3 to enable meshing of the third gear 3 with the fourth gear 4 to facilitate rotation of the fourth gear 4. The rotation of the fourth gear 4 allows the fifth gear 5 to rotate and mesh with the sixth gear 6 to transmit power from engine to the PTO shaft 16 and achieve the economic speed mode/ high speed mode of the tractor.
Further, when the operator operates the lever to achieve the reverse speed PTO mode, the shifting fork 10 along with the sixth gear 6 and the seventh gear 7 displaces to allow the first gear 1 to mesh with the second gear 2 to allow the second gear 2 to rotate. The rotation of the second gear 2 causes the rotation of the third gear 3 to allow meshing of the third gear 3 with the fourth gear 4. The meshing of the third gear 3 with fourth gear 4 causes rotation of the fourth gear 4 which in turn rotates the fifth gear 5. The rotation of the fifth gear 5 allows meshing of the fifth gear 5 with the eighth gear 8 to cause the eighth gear 8 to rotate. Further, the rotation of the eighth gear 8 causes the ninth gear 9 to mesh with the seventh gear 7 to transmit power from engine to the PTO shaft 16 and achieve the reverse speed PTO mode.
Thus, the arrangement 100 of the present disclosure allows for variable speed selection of the tractor. Further, the arrangement 100 is simple in construction and is compact as compared to the conventional arrangements which are bulky and complex. Further, the arrangement 100 enables a tractor to perform different operations suitable for different equipment at different speeds like rotary tiller, post hole digger, water pump, seed drill, mulching, power harrow, generator and etc. The arrangement 100 has fewer components as compared to the conventional arrangements.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of an arrangement for enabling variable speed selection, that:
• is simple in construction;
• enables a tractor to perform different operations suitable for different equipment at different speeds like rotary tiller, post hole digger, water pump, seed drill, mulching, power harrow, generator and etc.;
• is compact; and
• has fewer components.
The embodiments herein, the various features, and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
The foregoing description of the specific embodiments so fully reveals the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.