DESC:FIELD OF THE INVENTION
[001] The invention relates to an oil feeding device.

BACKGROUND OF THE INVENTION
[002] Lubrication of transmission and its various parts is critical for smooth or efficient performance of a vehicle. A synchronizer is one of the main components of a transmission which plays an important role in how a driver experiences gear shift. Typically, the synchronizer comprises of a hub, a sleeve, an inner ring, an intermediate ring, and an outer ring. The sleeve of the synchronizer is moved by a shift fork towards a gear to be engaged. As long as there is speed difference between the sleeve and the gear, the sleeve is blocked by the outer ring creating a frictional torque. During this operation, significant heat is generated, and hence it is essential to keep the synchronizer lubricated.
[003] It is also common to provide a synchronizer for engaging a reverse gear. During the reverse gear operation especially, it has been observed that the outer ring tends to wear out. Thus, there is a need for additional lubrication of the outer ring when the reverse gear is engaged to address at least the aforementioned problem.

SUMMARY OF THE INVENTON
[004] In one aspect, the present invention provides an oil feeding device for a transmission. The oil feeding device feeds oil to an outer ring of a synchronizer. The oil feeding device comprises a tray mounted adjacent to at least one shift fork on a shift rail. The tray is disposed above the outer ring of the synchronizer engaged by the shift fork. The tray receives oil splashed by one or more gears disposed in the transmission. At least one passage is provided on the tray to allow oil in the tray to pass out from the tray and feed oil to the outer ring underlying gear.

BRIEF DESCRIPTION OF THE DRAWINGS
[005] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 shows an oil feeding device in accordance with an embodiment of the invention.
Figure 2 shows a reverse shift fork in accordance with an embodiment of the invention.
Figure 3 shows a transmission in accordance with an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION
[006] The present invention provides an oil feeding device to feed oil or lubricate one or more parts of a transmission. The oil feeding device can be adapted inside a transmission casing such that the oil feeding device accumulates/catches oil picked up by a gear and feeds the oil to parts adjacent to the oil feeding device.
[007] Figure 1 shows an oil feeding device 100 in accordance with an embodiment of the invention. The oil feeding device comprises of a tray 110, a first support member 140 and a second support member 150. The tray comprises a base plate 112, opposing side walls 120a, b, and a rear wall 130. The base plate extends from a first end to a second end with pair of opposing side walls and the rear wall provided at the second end. The plate member is open at the first end for allowing oil to be introduced into the oil feeding device, and the walls allow oil to be accumulated in the oil feeding device. In an embodiment, the base plate extends in a curvilinear manner from the first end to the second end. The curvilinear profile enables the oil feeding device to be accommodated above a gear/synchronizer. Further as shown in the figure, a passage 112 is provided on base of the tray i.e. the base plate for allowing oil to pass out from the oil feeding device. Preferably, two passages are provided. The first support member is provided on the side wall or the rear wall. As shown in the figure, the first support member is a ring-shaped member capable of being adapted to a shaft. Further, a slit is provided on the ring-shaped member for easy assembly of the oil feeding device. The second support member is an arm extending perpendicularly from the other side wall. The arm has a slit-type construction enabling the oil feeding device to be snap-fitted with a corresponding slot or hole in a part or component adjacent to the oil feeding device. Accordingly, the oil feeding device when mounted rests on a shaft and is further locked/supported via the second support member.
[008] In an embodiment, the oil feeding device feeds is adapted to a shift fork on a shift rail so as to feed oil to a synchronizer being engaged by the shift fork. Figure 2 shows a reverse shift fork 200 in accordance with an embodiment of the invention. As shown, the oil feeding device is mounted on a shift rail 210 of the reverse shift fork. The oil feeding device is mounted on the shift rail via the first support member, and further locked with the body of the reverse shift fork. The oil feeding device will thus move along with the reverse shift fork when the reverse shift fork is engaged or disengaged with a synchronizer 250. The synchronizer typically comprises of a hub, an inner ring, an intermediate ring, an outer ring. Upon engagement of the reverse gear, the oil feeding device is positioned/packaged above outer ring 252 of the synchronizer. During operation, oil feeding device catches oil splashed in the transmission, and the oil gets accumulated/collected in the oil feeding device. Further, the passages of the oil feeding device which are aligned with the outer ring allows the oil to fall on to the outer ring, thereby lubricating the outer ring when the reverse fork is engaged.
[009] Figure 3 shows an illustrative representation of the oil feeding device adapted to a transmission 300 during a reverse gear operation. As shown, the reverse fork 200 is engaged with the synchronizer 250. In reverse gear operation, ring gear 302 rotates in an anti-clockwise direction. While rotating, the ring gear picks up oil which is thrown/splashed in the direction of the oil feeding device, which is denoted by ‘X’. The oil feeding device will catch the oil splashed by at least the ring gear, and direct it towards the outer ring through the passages provided on the oil feeding device, thereby feeding oil to the outer ring during its operation, and avoiding the problems emanating due to inadequate lubrication of the outer ring.
[010] Advantageously, the present invention enables outer ring of the synchronizer assembly to be well lubricated. Further, the present invention is capable of being adapted on existing transmissions and does not require the installation of an entirely new transmission. Accordingly, the oil feeding device is economical and provides lubrication at no added cost.
[011] While the present invention has been described with respect to certain embodiments, it will be apparent to those skilled in the art that various changes and modification may be made without departing from the scope of the invention as defined in the following claims.
,CLAIMS:WE CLAIM:
1. An oil feeding device 100 for a transmission, the oil feeding device feeds oil to an outer ring of a synchronizer 250, the oil feeding device comprising:
a tray 110 mounted adjacent to a shift fork 200 on a shift rail 210 such that the tray is disposed above the outer ring of the synchronizer engaged by the shift fork, the tray receives oil splashed by one or more gears disposed in the transmission; and
at least one passage 112 provided on the tray 110 to allow oil in the tray to pass out from the tray 110 and feed oil to the underlying outer gearing of the synchronizer.

2. The oil feeding device 100 as claimed in claim 1, wherein the tray comprising a base plate extending from a first end to a second end with a pair of opposing side walls 120a, 120b, the first end being open for allowing oil to be introduced into the oil feeding device, and a rear wall 130 provided at the second end of the plate.

3. The oil feeding device 100 as claimed in claim 2, wherein the at least one passage is provided on the base plate.

4. The oil feeding device as claimed in claim 1, wherein a first support member 140 is provided on the rear wall or side wall for adapting the oil feeding device to the shift rail.

5. The oil feeding device as claimed in claim 4, wherein the first support member is a ring-shaped bracket.

6. The oil feeding device as claimed in claim 1, wherein a second support member 150 is provided on at least one of the side walls for coupling the oil feeding device to an adjacent part or component.

7. The oil feeding device as claimed in claim 6, wherein the second support member is an arm extending perpendicularly from one of the side walls, the arm engageable with a corresponding slot/hole in the adjacent part or component.

8. The oil feeding device as claimed in claim 1, wherein the tray has a curvilinear profile.