Shifting fork and synchronizer for tractor

Abstract

The utility model relates to a gear shifting fork and a synchronizer for a tractor, and belongs to the technical field of gear shifting transmission. Comprising a shifting fork body and a piston structure. The shifting fork body comprises an arm body, a shifting fork arm and a shifting fork shaft seat; the shifting fork arms are located on the two sides of the arm body. The shifting fork shaft base is connected with the arm body and located on the top of the shifting fork body. A coaxial shaft hole is formed in the shifting fork shaft seat; the piston structure comprises a piston and a sleeving ring; the piston is arranged in the sleeving ring in a penetrating mode, and the sleeving ring is arranged in the shaft hole in a penetrating mode. Two lubricating oil channels are formed in the shifting fork body and used for storing lubricating oil for lubricating the shifting fork body. An oil channel opening is formed in the upper portion of the inner wall of each of the two sides of the shifting fork arm. Active lubrication of the shifting fork structure and the synchronizer can be achieved, the requirement for lubrication of the synchronizer at different rotating speeds is met, the overheating risk is reduced, and the transmission efficiency of the synchronizer is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear shifting and transmission, and particularly relates to a gear shift fork and a synchronizer for a tractor. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Tractors are generally equipped with a power take-off (PTO) device at the rear end of the rear axle to provide power to agricultural equipment such as rotary tillers, balers, and seeders. Usually, tractors achieve changes in PTO speed by shifting the synchronizer meshing gear sleeve left and right through the shift fork. Ensuring the lubrication of the shift fork structure and synchronizer is key to the normal operation of the power take-off (PTO).

[0004] However, the existing lubrication structure design for the shift fork structure and synchronizer has some technical problems, such as:

[0005] (1) In the prior art, the lubrication method for the shift fork structure and the synchronizer is mainly splash lubrication. However, the contact area between the lubricating oil in the splashing state and the shift fork structure and the synchronizer is small, and the internal lubrication is difficult, which leads to easy wear of the contact surface of the shift fork structure and the synchronizer. At the same time, due to the small amount of lubricating oil, the heat needs to be removed multiple times, which increases the risk of overheating of the synchronizer.

[0006] (2) In the prior art, the lubrication method for the shift fork structure and the synchronizer is also the immersion lubrication method. This lubrication method has a relatively poor lubrication effect on the unimmersed parts or the parts far from the oil level when the synchronizer speed is low, and is more prone to wear or overheating; when the synchronizer speed is high, the parts immersed in the oil will produce a relatively large oil stirring power loss, thereby reducing the transmission efficiency of the synchronizer; and it is difficult to adapt to the different speeds of the synchronizer. Utility Model Content

[0007] The purpose of the utility model is to provide a shift fork and synchronizer for a tractor, which can realize active lubrication of the shift fork structure and the synchronizer, adapt to the lubrication requirements of the synchronizer at different speeds, thereby reducing the risk of overheating and improving the transmission efficiency of the synchronizer.

[0008] A shift fork for a tractor, comprising: a shift fork body and a piston structure;

[0009] The fork body includes an arm body, a fork arm and a fork shaft seat; the fork arms are located on both sides of the arm body, the fork shaft seat is connected to the arm body and is located on the top of the fork body; a coaxial shaft hole is provided on the fork shaft seat;

[0010] The piston structure comprises a piston and a sleeve ring; the piston is arranged in the sleeve ring, and the sleeve ring is arranged in the shaft hole;

[0011] Two lubricating oil channels are arranged in the inside of the shifting fork body, and are used for storing lubricating oil for lubricating the shifting fork body; meanwhile, one oil channel opening is arranged above the inner wall of each side of the shifting fork arm.

[0012] As a further technical scheme, a first hole and a second hole are arranged at the bottom of the sleeve ring and the bottom of the shaft hole respectively, and the first hole and the second hole are vertically corresponding.

[0013] As a further technical scheme, the top ports of the two lubricating oil channels correspond to the second hole, and the two bottom ports of the two lubricating oil channels correspond to the two oil channel openings arranged above the inner walls of the two sides of the shifting fork arm respectively.

[0014] As a further technical scheme, a sealing ring is arranged between the piston and the sleeve ring.

[0015] As a further technical scheme, the sleeve ring is fixedly connected with the shaft hole through a bolt.

[0016] As a further technical scheme, a sliding shoe hole is arranged below the inner wall of each side of the shifting fork arm.

[0017] As a further technical scheme, the shifting fork for tractors further comprises two sliding shoes, and the two sliding shoes are fixed to the inner walls of the two sides of the shifting fork arm through bolts respectively; the fixed positions of the two sliding shoes correspond to the two sliding shoe holes.

[0018] As a further technical scheme, the outer surfaces of the two sliding shoes are elliptical.

[0019] As a further technical scheme, the length of the sleeve ring is greater than the length of the shaft hole and less than the length of the piston.

[0020] The utility model discloses still a kind of synchronizer for tractor, it include: synchronizer gear sleeve, synchronizer ring assembly, synchronizer gear hub and combined gear ring;The synchronizer gear sleeve, synchronizer ring assembly, synchronizer gear hub and combined gear ring are adapted with the gear shifting fork described in any one of the above.

[0021] The beneficial effects of one or more of the above technical solutions are as follows:

[0022] (1) The utility model discloses inside the inside of the shifting fork body is equipped with two lubricating oil channels for storing the lubricating oil for lubricating the shifting fork body, and an oil port is formed on the upper side of the inner wall of the shifting fork arm.

[0023] (2) After the utility model discloses setting the lubricating mode as active lubrication, the lubricating effect of each part is no longer affected by the speed of the synchronizer, and even the parts far from the oil level can still be sufficiently lubricated. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein for purposes of illustration. The embodiments of the application, and the specification, are exemplary

[0025] Figure 1 It is a structural schematic diagram of the shifting fork for tractor in the utility model embodiment.

[0026] Figure 2 It is the general structure schematic diagram of the shifting fork and synchronizer for tractor in the utility model embodiment.

[0027] Figure 3 It is a structural schematic diagram of the synchronizer for tractor in the utility model embodiment.

[0028] Figure 4 It is a partial structure schematic diagram of the shifting fork in the utility model embodiment.

[0029] In the figure, 1 is an arm body, 2 is a shifting fork arm, 3 is a shifting fork shaft seat, 4 is a shaft hole, 5 is a piston, 6 is a sleeve ring, 7 is a lubricating oil channel, 8 is an oil port, 9 is a sliding shoe hole, 10 is a sliding shoe, 11 is a synchronizer gear sleeve, 12 is a synchronizer ring assembly, 13 is a synchronizer gear hub, and 14 is a combined gear ring. DETAILED DESCRIPTION

[0030] The specific implementation of the embodiment will be described below with reference to the accompanying drawings.

[0031] As Figure 1 described, the utility model embodiment provides a shifting fork for tractor.

[0032] A shifting fork for tractor comprises a shifting fork body and a piston structure.

[0033] The fork body includes an arm body 1, a fork arm 2 and a fork shaft seat 3; the fork arm 2 is located on both sides of the arm body 1, and the fork shaft seat 3 is connected to the arm body 1 and is located on the top of the fork body; a coaxial shaft hole 4 is provided on the fork shaft seat 3;

[0034] The piston structure includes a piston 5 and a sleeve ring 6; the piston 5 is inserted into the sleeve ring 6, and the sleeve ring 6 is inserted into the shaft hole 4;

[0035] Two lubricating oil channels 7 are provided inside the fork body for storing lubricating oil for lubricating the fork body. At the same time, an oil channel opening 8 is provided above the inner wall on both sides of the fork arm 2 .

[0036] Based on the above-mentioned design of the present invention, active lubrication of the shift fork structure and synchronizer can be achieved, adapting to the synchronizer's lubrication requirements at different speeds, thereby reducing the risk of overheating and improving the synchronizer's transmission efficiency. To facilitate understanding of the technical solution of the present invention, the specific structure of this tractor shift fork is further explained and illustrated below.

[0037] like Figure 1 、 Figure 4 As shown, two lubricating oil passages 7 are provided inside the shift fork body, and an oil passage opening 8 is provided above the inner wall on both sides of the shift fork arm 2. To achieve the through-flow of the lubricating oil passages, a first hole and a second hole (not shown in the figure) are provided at the bottom of the sleeve ring 6 and the bottom of the shaft hole 4, respectively. The first hole and the second hole correspond vertically. After the lubricating oil passages 7 are added to the interior of the shift fork body, the lubrication of the shift fork structure and synchronizer in motion becomes active lubrication, and no longer needs to rely on the rotational speed to drive the oil splashing to achieve lubrication. At the same time, the increased amount of lubricating oil means that the lubrication effect of each part is no longer affected by the speed of the synchronizer, and even parts far from the oil level can still receive sufficient lubrication. Therefore, the utility model can not only effectively reduce the wear of the contact surface of the shift fork structure and the synchronizer, but also enhance the cooling capacity of the synchronizer and reduce the risk of overheating. It can also adapt to the lubrication needs of the synchronizer at different speeds, thereby improving the transmission efficiency of the synchronizer. At the same time, this design no longer requires the design of oil passages on the outside of the shift fork structure, reducing the number of components and facilitating the compact arrangement of the oil passages.

[0038] Furthermore, the top ports of the two lubricating oil passages correspond to the second hole; simultaneously, the bottom ports of the two lubricating oil passages correspond to the two oil passage openings 8 provided on the inner walls of the shift fork arm 2. This allows hydraulic oil and the system oil within the piston 5 to flow directly into the first and second holes, respectively, pass through the lubricating oil passages 7, and then exit through the oil passage openings 8. Therefore, the present invention allows for the system oil within the piston 5 to be shared with the system oil. Furthermore, the system oil within the piston 5 can be depressurized through the lubricating oil passages 7. This faster pressure drop in the system oil facilitates the rapid return of the synchronizer sleeve, thereby improving pressure relief and shifting efficiency.

[0039] A sealing ring (not shown in the figure) is further provided between the piston 5 and the sleeve ring 6 to ensure a sealing effect between the piston 5 and the sleeve ring 6 .

[0040] Furthermore, the sleeve ring 6 is fixedly connected to the shaft hole 4 by a pin, and the length of the sleeve ring 6 is greater than the length of the shaft hole 4 and less than the length of the piston 5. In actual operation, the axial movement of the piston 5 can indirectly drive the movement of the fork body.

[0041] like Figure 1 As shown, a slipper hole 9 is provided below the inner wall on both sides of the shift fork arm 2; at the same time, the tractor shift fork also includes two slippers 10, which are fixed to the inner wall of the shift fork arm 2 on both sides by pins, and the fixed positions of the two slippers 10 correspond to the two slipper holes 9.

[0042] Furthermore, the outer surfaces of the two sliding shoes 12 are elliptical. As auxiliary components, the sliding shoes 12 can interact with the fork body and the synchronizer during actual application to help the fork body move more smoothly and provide additional support.

[0043] like Figure 2 、 Figure 3 As shown, the utility model also discloses a synchronizer for a tractor, comprising: a synchronizer sleeve 11, a synchronizer ring assembly 12, a synchronizer hub 13 and a combined ring gear 14; the synchronizer sleeve 11, the synchronizer ring assembly 12, the synchronizer hub 13 and the combined ring gear 14 are adapted to any of the shift forks described above.

[0044] In actual work process, the piston 5 drives the shift fork body to move axially under the power of hydraulic oil;Because the sliding shoe 10 on the shift fork body is directly connected with the synchronizer gear sleeve 11, and the synchronizer gear sleeve 11 has a gap with the synchronizer ring on the synchronizer ring assembly 12, the axial movement of the shift fork body will make the synchronizer gear sleeve 11 and the synchronizer ring on the synchronizer ring assembly 12 gradually close;The synchronizer ring assembly 12 will make the synchronizer gear sleeve 11 and the combined gear 14 synchronous in speed through friction, and then make the synchronizer gear sleeve smoothly slide into the synchronizer gear ring 14 to realize gear shifting;Because the structure design of the synchronizer is not the main technical point of the utility model, it is not described here.

[0045] In the whole gear shifting process, the two sliding shoes 10 drive the synchronizer ring assembly 12 to move left and right, and the piston 5 exerts hydraulic oil force at the place, the shift fork body transmits the force transmitted by the piston 5 to the sliding shoe 10, realizes the pre-synchronization and gear shifting of the synchronizer, through the active lubrication design on the lubrication channel 9, the system oil can be shared with the lubricating oil, the amount of lubricating oil is increased, and then the wear of the contact surface of the shift fork structure and the synchronizer can be reduced while the cooling capacity of the synchronizer is enhanced, the overheating risk and the transmission efficiency are reduced.

[0046] Although the specific embodiments of the utility model have been described above with reference to the drawings, it is not a limitation on the protection scope of the utility model, and those skilled in the art should understand that various modifications or deformations made by the skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. A shift fork for a tractor, characterized in that, Include: Shifting fork body and piston structure; The shifting fork body includes an arm body (1), a shifting fork arm (2) and a shifting fork shaft seat (3); the shifting fork arm (2) is located on both sides of the arm body (1), and the shifting fork shaft seat (3) is connected with the arm body (1) and located at the top of the shifting fork body; a coaxial shaft hole (4) is arranged on the shifting fork shaft seat (3); The piston structure includes a piston (5) and a sleeve ring (6); the piston (5) is arranged in the sleeve ring (6), and the sleeve ring (6) is arranged in the shaft hole (4); Two lubricating oil channels (7) are arranged in the shifting fork body, for storing lubricating oil for lubricating the shifting fork body; meanwhile, an oil channel opening (8) is arranged on the upper side of the inner wall of the shifting fork arm (2) on both sides.

2. A shift fork for a tractor as set forth in claim 1, characterized in that A first hole and a second hole are respectively arranged at the bottom of the sleeve ring (6) and the bottom of the shaft hole (4), and the first hole and the second hole are vertically corresponding.

3. A shift fork for a tractor according to any one of claims 1-2, characterized in that The top ports of the two lubricating oil channels (7) correspond to the second hole, and the two bottom ports of the two lubricating oil channels (7) correspond to the two oil channel openings (8) arranged on the upper side of the inner wall of the shifting fork arm (2) on both sides.

4. The shift fork according to claim 1, wherein A sealing ring is arranged between the piston (5) and the sleeve ring (6).

5. The shift fork according to claim 1, wherein The sleeve ring (6) is fixedly connected with the shaft hole (4) through a latch.

6. The shift fork according to claim 1, wherein A sliding shoe hole (9) is arranged on the lower side of the inner wall of the shifting fork arm (2) on both sides.

7. A shift fork for a tractor as defined in claim 6, characterized in that Two sliding shoes (10) are arranged on the inner wall of the shifting fork arm (2) on both sides through a latch; the fixed positions of the two sliding shoes (10) correspond to the two sliding shoe holes (9).

8. A shift fork for a tractor as defined in claim 7, characterized in that The outer surfaces of the two sliding shoes (10) are elliptical.

9. The shift fork according to claim 1, wherein The length of the sleeve ring (6) is greater than the length of the shaft hole (4) and less than the length of the piston (5).

10. A tractor synchronizer characterized by comprising: Include: Synchronizer sleeve (11), synchronizer ring assembly (12), synchronizer hub (13) and combined gear ring (14); the synchronizer sleeve (11), synchronizer ring assembly (12), synchronizer hub (13) and combined gear ring (14) are adapted to the gear shifting fork in any one of claims 1-9.

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