Rear axle transmission mechanism of tire central inflation system and tractor

Abstract

The utility model relates to a rear axle transmission mechanism of a tire central inflation system and a tractor, and relates to the field of tractor rear axles. A transmission shell is provided with a shell air hole, one end of a driving shaft is rotatably connected with the transmission shell, an in-shaft air hole is formed in the driving shaft, and one end of the in-shaft air hole penetrates through the side wall of one end of the driving shaft and is communicated with the shell air hole; the other end of the in-shaft air hole penetrates through the end wall or the side wall of the other end of the driving shaft and is communicated with a wheel; a key groove is formed in the side wall of the other end of the driving shaft, the wheel slidably sleeves the other end of the driving shaft, and the positioning key is inserted between the key groove and the wheel and positions the wheel. The wheel has the beneficial effects that the holes for air to pass through are formed in the driving shaft and the transmission shell, so that the wheel can be communicated with a tire inflation / deflation system in the running process of a vehicle to carry out inflation / deflation operation, and the purposes of improving the traction force of the whole vehicle, saving oil consumption and improving the operation comfort are achieved. The wheels can move in the axial direction so as to adjust the wheel distance, and the positions of the wheels are locked through the positioning keys after adjustment is completed.

Description

Technical Field

[0001] This utility model relates to the field of tractor rear axles, specifically to a rear axle transmission mechanism of a tire central inflation system and a tractor. Background Technology

[0002] Equipping tractors with a tire inflation / deflation system that automatically inflates and deflates tires can improve the tractor's passability, such as on icy or muddy roads.

[0003] Most existing tire inflation / deflation systems can only connect to the tires when the vehicle is parked. Due to structural limitations, they cannot maintain connection with the tires while the vehicle is in motion (i.e., while the rear axle drive shaft is rotating). Furthermore, the wheel track between the two rear wheels often needs to be adjusted under different operating conditions. Therefore, it is necessary to design a new type of rear axle drive mechanism that allows the tire inflation / deflation system to always be connected to the tires, continuously monitoring and adjusting tire pressure according to different soil conditions, types of agricultural implements, etc., while also facilitating the adjustment of the rear wheel track. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to keep the tire inflation / deflation system always connected to the tire and make it easy to adjust the wheel track.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A rear axle transmission mechanism of a tire central inflation system includes a transmission housing, a drive shaft, a wheel, and a positioning key. The transmission housing has a housing air hole. One end of the drive shaft is rotatably connected to the transmission housing. The drive shaft has an internal air hole. One end of the internal air hole penetrates the side wall of one end of the drive shaft and communicates with the housing air hole. The other end of the internal air hole penetrates the end wall or side wall of the other end of the drive shaft and communicates with the wheel. A keyway is provided on the side wall of the other end of the drive shaft. The wheel is slidably sleeved on the other end of the drive shaft. The positioning key is inserted between the keyway and the wheel and positions the wheel.

[0006] The beneficial effects of this utility model are as follows: This solution improves the rear axle assembly by creating holes for gas to pass through in the drive shaft and transmission housing. This allows the wheels to connect with the tire inflation / deflation system during vehicle operation. The system works in conjunction with the overall tire inflation / deflation system to determine the difference between the actual tire pressure and the target tire pressure, performing inflation / deflation operations to improve overall vehicle traction, save fuel, and increase handling comfort. Simultaneously, a keyway is provided at the other end of the drive shaft, allowing the wheels to move axially to adjust the wheel track. After adjustment, the wheel position is locked using a positioning key.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the wheel includes a hub and a tire, the tire is fitted on the outside of the hub, the length of the keyway is greater than the length of the hub, and the other end of the air hole in the axle is connected to the tire through a pipe.

[0009] Furthermore, the rear axle transmission mechanism of the tire central inflation system also includes a retaining ring, which is fixedly sleeved on the other end of the drive shaft.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the retaining ring is used to limit the wheel and prevent the wheel from falling off the drive shaft.

[0011] Furthermore, air valves are installed at both the end of the housing air hole and the other end of the shaft air hole.

[0012] The beneficial effects of adopting the above-mentioned further solution are: the air valve opens when inflation or deflation is needed, allowing gas to enter or exit the wheel; and the air valve closes when inflation or deflation is not needed, preventing air leakage from the wheel.

[0013] Furthermore, the rear axle transmission mechanism of the tire central inflation system also includes a shaft sleeve and two sets of oil-gas seal assemblies. The shaft sleeve is fixedly sleeved on the outside of one end of the drive shaft. The shaft sleeve has a sleeve hole that is correspondingly provided and communicates with one end of the air hole inside the shaft. The oil-gas seal assembly is sleeved between the shaft sleeve and the transmission housing. The two sets of oil-gas seal assemblies are respectively arranged on both sides of the sleeve hole along the axial direction of the drive shaft.

[0014] The beneficial effects of adopting the above-mentioned further solution are: the shaft sleeve rotates with the drive shaft, the oil-gas seal assembly does not rotate, and seals the gap between the shaft sleeve and the transmission housing. The area between the two sets of oil-gas seal assemblies forms a channel for gas to pass through. After passing through the housing vent, the channel between the two sets of oil-gas seal assemblies, and the sleeve hole, the gas enters the vent inside the shaft and inflates the wheel; or the gas inside the wheel is discharged in the reverse direction.

[0015] Furthermore, the rear axle transmission mechanism of the tire central inflation system also includes a spacer sleeve. The spacer sleeve is annular and located between the two sets of oil-gas seal assemblies. The spacer sleeve has a spacer sleeve through hole along its radial direction. One end of the spacer sleeve through hole is coaxially arranged and communicates with the housing air hole. The inner wall of the spacer sleeve is spaced apart from the shaft tube sleeve to form an annular gas flow cavity. The other end of the spacer sleeve through hole and the sleeve hole are both communicated with the gas flow cavity.

[0016] The beneficial effects of adopting the above-mentioned further solution are: on the one hand, the spacer can axially limit the two sets of oil and gas sealing components; on the other hand, during the rotation of the drive shaft, the annular gas flow cavity of the spacer can always be connected with the rotating sleeve hole.

[0017] Furthermore, the inner wall of the bushing has an annular groove opened along its circumference, the bushing hole is located at the bottom of the annular groove, and multiple holes are spaced apart along the circumference of the annular groove.

[0018] The beneficial effects of adopting the above-mentioned further solution are: the annular groove forms an annular space for air to flow through, multiple sleeve holes can be connected to the annular groove at the same time, the gas passage efficiency is high, and the airflow can be buffered at the same time.

[0019] Furthermore, the rear axle transmission mechanism of the tire central inflation system also includes a sealing ring, which is sandwiched between the shaft sleeve and the drive shaft, and at least one sealing ring is provided on each side of the air hole inside the shaft along the axial direction of the drive shaft.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the sealing ring seals the gap between the shaft sleeve and the drive shaft, thus preventing gas leakage.

[0021] Furthermore, the rear axle transmission mechanism of the tire central inflation system also includes a positioning pin, one end of which passes through the axle sleeve, and the other end of which is fixedly connected to the drive shaft.

[0022] The advantages of adopting the above-mentioned further solution are: the shaft sleeve and the drive shaft are fixed by the locating pin, realizing circumferential and axial limiting, which makes positioning convenient and easy to disassemble and assemble.

[0023] This utility model also provides a tractor, including a tire inflation / deflation system and a rear axle transmission mechanism of the central tire inflation system, wherein the tire inflation / deflation system is connected to the air vent of the housing. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the rear axle transmission mechanism of a tire central inflation system according to this utility model.

[0025] Figure 2 for Figure 1 A partial enlarged view of point A of the rear axle transmission mechanism of a tire central inflation system;

[0026] Figure 3 This is a structural diagram of the rear axle transmission mechanism of a tire central inflation system of this utility model when a wheel is installed.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Transmission housing; 101. Housing vent; 2. Drive shaft; 201. Shaft vent; 202. Keyway; 3. Oil-air seal assembly; 4. Spacer; 5. Shaft sleeve; 501. Sleeve hole; 502. Annular groove; 6. Sealing ring; 7. Locating pin; 8. Washer; 9. Wheel; 10. Air valve; 11. Retaining ring. Detailed Implementation

[0029] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] like Figures 1-3 As shown, this embodiment provides a rear axle transmission mechanism for a central tire inflation system, including a transmission housing 1, a drive shaft 2, a wheel 9, and a positioning key. The transmission housing 1 has a housing air hole 101. One end of the drive shaft 2 is rotatably connected to the transmission housing 1. The drive shaft 2 has an internal air hole 201. One end of the internal air hole 201 passes through the side wall of one end of the drive shaft 2 and communicates with the housing air hole 101. The other end of the internal air hole 201 passes through the end wall or side wall of the other end of the drive shaft 2 and communicates with the wheel 9. The side wall of the other end of the drive shaft 2 is provided with a keyway 202. The wheel 9 is slidably sleeved on the other end of the drive shaft 2. The positioning key is inserted between the keyway 202 and the wheel 9 and positions the wheel 9.

[0031] This solution improves the rear axle assembly by creating holes in the drive shaft 2 and transmission housing 1 for air to pass through. This allows the wheels 9 to connect with the tire inflation / deflation system during vehicle operation. The system works in conjunction with the overall tire inflation / deflation system to determine the difference between the actual tire pressure and the target tire pressure, performing inflation / deflation operations to improve vehicle traction, save fuel, and increase handling comfort. Simultaneously, a keyway 202 is provided at the other end of the drive shaft 2, allowing the wheels 9 to move axially to adjust the wheel track. After adjustment, the position of the wheels 9 is locked using a positioning key.

[0032] Optional, such as Figure 1 As shown, when the other end of the internal air hole 201 is connected to the end wall of the other end of the drive shaft 2, the other end of the internal air hole 201 is coaxially arranged with the drive shaft 2. Alternatively, when the other end of the internal air hole 201 is connected to the side wall of the other end of the drive shaft 2, an annular component similar to a spacer 4 is fixedly provided on the outside of the drive shaft 2, and an annular cavity is formed in the annular component. The other end of the internal air hole 201 is connected to the tire of the wheel 9 through the annular component.

[0033] Specifically, the positioning key is a flat key or other types of positioning key.

[0034] Based on the above technical solution, the wheel 9 includes a hub and a tire. The tire is fitted on the outside of the hub. The length of the keyway 202 is greater than the length of the hub. The other end of the air hole 201 in the axle is connected to the tire through a pipe.

[0035] The length of the keyway 202 is greater than the length of the hub. Specifically, the length of the hub refers to the length at the contact point between the hub and the drive shaft 2.

[0036] In this design, the position of the wheel hubs on drive shaft 2 can be infinitely adjusted, meaning the installation position of the left and right wheel hubs on drive shaft 2 can be adjusted within a range of 0–250 mm, enabling adjustable rear wheel track and accommodating different row spacing operations. It also incorporates a central air inflation function, which helps agricultural tractors get out of trouble and increases driving torque.

[0037] Based on the above technical solution, the rear axle transmission mechanism of the tire central inflation system also includes a retaining ring 11, which is fixedly sleeved on the other end of the drive shaft 2.

[0038] The retaining ring 11 is used to limit the wheel 9 and prevent the wheel 9 from falling off the drive shaft 2.

[0039] Based on the above technical solution, an air valve 10 is installed at the end of the housing air hole 101 and the other end of the shaft air hole 201.

[0040] The air valve 10 opens when inflation or deflation is needed, allowing air to enter or exit the wheel 9; when inflation or deflation is not needed, the air valve 10 closes to prevent air leakage from the wheel 9.

[0041] Specifically, valve 10 is an electronically controlled valve. Valve 10 is connected to the tire inflation / deflation system. The tire inflation / deflation system monitors tire pressure in real time and opens valve 10 when inflation or deflation is required.

[0042] Based on the above technical solution, the rear axle transmission mechanism of the tire central inflation system also includes a shaft sleeve 5 and two sets of oil-air seal assemblies 3. The shaft sleeve 5 is fixedly sleeved on the outside of one end of the drive shaft 2. The shaft sleeve 5 has a sleeve hole 501 that is correspondingly provided and connected to one end of the air hole 201 inside the shaft. The oil-air seal assembly 3 is sleeved between the shaft sleeve 5 and the transmission housing 1. The two sets of oil-air seal assemblies 3 are respectively arranged on both sides of the sleeve hole 501 along the axial direction of the drive shaft 2.

[0043] The shaft sleeve 5 rotates with the drive shaft 2, while the oil-gas seal assembly 3 does not rotate and seals the gap between the shaft sleeve 5 and the transmission housing 1. The area between the two sets of oil-gas seal assemblies 3 forms a channel for gas to pass through. After passing through the housing vent 101, the channel between the two sets of oil-gas seal assemblies 3, and the sleeve hole 501, the gas enters the shaft vent 201 and inflates the wheel 9; or the gas in the wheel 9 is discharged in the reverse direction.

[0044] Based on the above technical solution, the rear axle transmission mechanism of the tire central inflation system also includes a spacer 4. The spacer 4 is annular and is located between the two sets of oil-gas seal assemblies 3. The spacer 4 has a spacer through hole along its radial direction. One end of the spacer through hole is coaxially arranged and connected with the housing air hole 101. The inner wall of the spacer 4 is spaced apart from the shaft tube sleeve 5 to form an annular gas flow cavity. The other end of the spacer through hole and the sleeve hole 501 are both connected to the gas flow cavity.

[0045] The spacer 4 can axially limit the two sets of oil and gas sealing components 3; on the other hand, during the rotation of the drive shaft 2, the annular gas flow cavity of the spacer 4 can always be connected with the rotating sleeve hole 501.

[0046] Specifically, such as Figure 2 As shown, the oil-gas seal assembly 3, the spacer 4 and the oil-gas seal assembly 3 are arranged sequentially along the axial direction of the drive shaft 2. A stepped hole is provided in the transmission housing 1. One end of one of the oil-gas seal assemblies 3 abuts against the boss of the stepped hole. A washer 8 is inserted in the stepped hole. The other oil-gas seal assembly 3 abuts against the washer 8.

[0047] Based on the above technical solution, the inner wall of the shaft sleeve 5 has an annular groove 502 opened along its circumference, the sleeve hole 501 is located at the bottom of the annular groove 502, and multiple holes are provided at intervals along the circumference of the annular groove 502.

[0048] The annular groove 502 forms an annular space for air to flow through. Multiple sleeve holes 501 can simultaneously communicate with the annular groove 502, resulting in high gas passage efficiency and buffering of airflow.

[0049] Furthermore, the internal air hole 201 includes a plurality of radial holes that are interconnected along the radial direction of the drive shaft 2 and an axial hole that is arranged along the axial direction. The plurality of radial holes are arranged circumferentially at intervals along the axial hole, and the plurality of radial holes are coaxially arranged in a one-to-one correspondence with the plurality of sleeve holes 501.

[0050] Based on the above technical solution, the rear axle transmission mechanism of the tire central inflation system also includes a sealing ring 6, which is sandwiched between the shaft sleeve 5 and the drive shaft 2, and at least one sealing ring 6 is provided on each side of the air hole 201 in the shaft along the axial direction of the drive shaft 2.

[0051] The sealing ring 6 seals the gap between the shaft sleeve 5 and the drive shaft 2 to prevent gas leakage.

[0052] Specifically, the outer wall of the drive shaft 2 is also provided with a mounting groove for installing the sealing ring 6, and the sealing ring 6 is located in the mounting groove.

[0053] Based on the above technical solution, the rear axle transmission mechanism of the tire central inflation system also includes a positioning pin 7, one end of which passes through the shaft sleeve 5, and the other end of which is fixedly connected to the drive shaft 2.

[0054] The shaft sleeve 5 and the drive shaft 2 are fixed by the locating pin 7, which realizes circumferential and axial limiting, making positioning convenient and easy to disassemble and assemble.

[0055] This embodiment also provides a tractor, including a tire inflation / deflation system and a rear axle transmission mechanism of the central tire inflation system, wherein the tire inflation / deflation system is connected to the air hole 101 of the housing.

[0056] In the description of this utility model, it should be noted that the terms "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rear axle transmission mechanism for a central tire inflation system, characterized in that, The device includes a transmission housing (1), a drive shaft (2), a wheel (9), and a positioning key. The transmission housing (1) has a housing vent (101). One end of the drive shaft (2) is rotatably connected to the transmission housing (1). The drive shaft (2) has an internal vent (201). One end of the internal vent (201) passes through the side wall of one end of the drive shaft (2) and communicates with the housing vent (101). The other end of the internal vent (201) passes through the end wall or side wall of the other end of the drive shaft (2) and communicates with the wheel (9). The side wall of the other end of the drive shaft (2) is provided with a keyway (202). The wheel (9) is slidably sleeved on the other end of the drive shaft (2). The positioning key is inserted between the keyway (202) and the wheel (9) and positions the wheel (9).

2. The rear axle transmission mechanism of a tire central inflation system according to claim 1, characterized in that, The wheel (9) includes a hub and a tire. The tire is fitted on the outside of the hub. The length of the keyway (202) is greater than the length of the hub. The other end of the air hole (201) in the shaft is connected to the tire through a pipe.

3. The rear axle transmission mechanism of a tire central inflation system according to claim 1, characterized in that, It also includes a retaining ring (11), which is fixedly sleeved on the other end of the drive shaft (2).

4. The rear axle transmission mechanism of a tire central inflation system according to claim 1, characterized in that, Air valves (10) are installed at both the end of the housing air hole (101) and the other end of the shaft air hole (201).

5. The rear axle transmission mechanism of a tire central inflation system according to claim 1, characterized in that, It also includes a shaft sleeve (5) and two sets of oil-gas seal assemblies (3). The shaft sleeve (5) is fixedly sleeved on the outside of one end of the drive shaft (2). The shaft sleeve (5) has a sleeve hole (501) that is corresponding to and communicates with one end of the shaft air hole (201). The oil-gas seal assembly (3) is sleeved between the shaft sleeve (5) and the transmission housing (1). The two sets of oil-gas seal assemblies (3) are respectively arranged on both sides of the sleeve hole (501) along the axial direction of the drive shaft (2).

6. The rear axle transmission mechanism of a tire central inflation system according to claim 5, characterized in that, It also includes a spacer (4), which is annular and located between the two sets of oil and gas sealing assemblies (3). The spacer (4) has a spacer through hole along its radial direction. One end of the spacer through hole is coaxially arranged and connected with the housing vent (101). The inner wall of the spacer (4) is spaced apart from the shaft sleeve (5) to form an annular gas flow cavity. The other end of the spacer through hole and the sleeve hole (501) are both connected to the gas flow cavity.

7. The rear axle transmission mechanism of a tire central inflation system according to claim 5, characterized in that, The inner wall of the bushing (5) has an annular groove (502) opened along its circumference. The bushing hole (501) is located at the bottom of the annular groove (502) and is provided at intervals along the circumference of the annular groove (502).

8. The rear axle transmission mechanism of a tire central inflation system according to claim 5, characterized in that, It also includes a sealing ring (6), which is sandwiched between the shaft sleeve (5) and the drive shaft (2), and at least one sealing ring (6) is provided on each side of the shaft air hole (201) along the axial direction of the drive shaft (2).

9. The rear axle transmission mechanism of a tire central inflation system according to any one of claims 5-8, characterized in that, It also includes a positioning pin (7), one end of which passes through the shaft sleeve (5), and the other end of which is fixedly connected to the drive shaft (2).

10. A tractor, characterized in that, The rear axle drive mechanism includes a tire inflation / deflation system and a tire central inflation system as described in any one of claims 1-9, wherein the tire inflation / deflation system is connected to the housing air vent (101).

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