A novel central inflation / deflation structure for drive axles

Abstract

This invention relates to a novel central air filling and deflation structure for a drive axle, comprising a shaft end, a bushing, a hub, and a combined oil-air seal. The bushing is fixedly connected to the shaft end; the shaft end passes through the hub and is fixedly connected to it; the hub is provided with a combined oil-air seal and an air filling and deflation channel; both the shaft end and the bushing have communicating air filling and deflation holes, which communicate with the air filling and deflation channel on the hub; combined oil-air seals are provided on both sides of the air filling and deflation channel. The oil sealing lip and the air sealing lip of the combined oil-air seal are designed separately and uniformly packaged. The oil sealing lip ensures the sealing requirements of the lubricating oil, and the air sealing lip ensures the sealing requirements of the high-pressure air. The two work in a complementary manner, thereby effectively ensuring the sealing performance of the central air filling and deflation structure.

Description

Technical Field

[0001] This invention relates to the field of axle sealing technology, and in particular to a novel central inflation / deflation structure for drive axles. Background Technology

[0002] With the continuous development of technology, the emergence of various complex working conditions places more stringent demands on the vehicle's maneuverability. The reliability of the central air filling and defilling structure of the drive axle is particularly important to the vehicle's maneuverability. Conventional central air filling and defilling sealing structures all adopt a double oil seal structure, which isolates the lubricating oil from the high-pressure air through the sealing performance of the oil seal. However, in order to ensure the sealing performance, the interference fit between the oil seal and the axle head is relatively large, which generates a large frictional torque during operation. This makes it easy for the axle head to groove and the oil seal to fail at high temperature during use, which seriously affects the vehicle's driving safety and makes it difficult to meet the requirements of use under harsh working conditions. Summary of the Invention

[0003] This invention proposes a novel central inflation / deflation structure for drive axles, which solves the defects of existing central inflation / deflation structures, such as poor sealing performance, large frictional torque, high temperature, rapid temperature rise, and short lifespan.

[0004] To address the problems mentioned above in the background section, the present invention is achieved through the following technical solution:

[0005] A novel central inflation / deflation structure for a drive axle includes an axle head, a bushing, a hub, and a combined oil-gas seal. The bushing is fixedly connected to the axle head. The axle head passes through the hub and is fixedly connected to it. The hub is provided with the combined oil-gas seal and an inflation / deflation channel. Both the axle head and the bushing are provided with communicating inflation / deflation holes, and these holes communicate with the inflation / deflation channel on the hub. Combined oil-gas seals are provided on both sides of the inflation / deflation channel.

[0006] Preferably, the lower end of the inflation / deflation channel communicates with the inflation / deflation hole provided at the connection between the axle head and the bushing, the upper end of the inflation / deflation channel is provided with a wheel valve, and the wheel valve is connected to the tire; the upper end of the axle head inflation / deflation hole communicates with the bushing inflation / deflation hole, and the lower end of the axle head inflation / deflation hole is provided with a connector, and the connector is connected to the vehicle air source.

[0007] Preferably, the combined oil-gas seal includes a skeleton, an oil seal lip, a thermally conductive insulating ring, a gas seal lip, and a fixing gasket ring; the oil seal lip is provided on one side of the skeleton; the gas seal lip is provided on the other side of the skeleton; a thermally conductive insulating ring is provided between the oil seal lip and the gas seal lip; one side of the gas seal lip is connected to the thermally conductive insulating ring; and a fixing gasket ring is connected to the other side of the gas seal lip.

[0008] Preferably, the gas sealing lip of the combined oil-gas seal is adjacent to the inflation / deflation channel of the wheel hub; the combined oil-gas seal is limited by the limiting platform of the wheel hub and positioned by the inner and outer retaining rings of the wheel hub.

[0009] Preferably, an adjusting shim ring is also provided between the inner retaining ring and the combined oil-gas seal.

[0010] Preferably, the combined oil-gas seal has an oil seal lip and a sealing ring fitted onto the bushing.

[0011] Preferably, the thermally conductive spacer ring is made of aluminum alloy.

[0012] Preferably, the gas sealing lip is made of polytetrafluoroethylene or polytetrafluoroethylene composite material.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] 1- Excellent sealing performance: The oil seal lip and the air seal lip are designed separately and packaged uniformly. The oil seal lip ensures the sealing requirements of the lubricating oil side, and the air seal lip ensures the sealing requirements of the high-pressure air side. The two work in a complementary manner, thereby effectively ensuring the sealing performance of the central venting structure.

[0015] 2- Slow temperature rise and high reliability: The gas seal lip in this application is made of a high-rigidity elastic wear-resistant material. When not in operation, it is relatively loose, and the frictional torque between it and the shaft head is relatively small, resulting in less heat generation. When in operation, due to the action of high-pressure gas, the gas seal lip is in close contact with the heat-conducting ring, thereby quickly dissipating the heat generated by friction, effectively reducing the working temperature of the sealing component and improving the working reliability of the central inflation and deflation structure.

[0016] 3- Good assembly processability: This application encapsulates the oil seal lip and gas seal lip through a skeleton, and the assembly of the sealing components in the central inflation and deflation structure can be completed in one press-fitting, thereby effectively improving the assembly efficiency of the product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the combined oil-gas seal;

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Shaft head; 2. Fastening screw; 3. Inner retaining ring; 4. Adjusting washer ring; 5. Hub; 6. Combined oil and gas seal; 61. Frame; 62. Oil seal lip; 63. Thermal insulating ring; 64. Gas seal lip; 65. Fixing washer ring; 7. Outer retaining ring; 8. Liner ring; 9. Sealing ring. Detailed Implementation

[0022] Example 1

[0023] like Figure 1 As shown, a novel central inflation / deflation structure for a drive axle includes an axle head 1, a bushing 8, a hub 5, and a combined oil-gas seal 6. The bushing 5 is fixedly connected to the axle head 1. The axle head 1 passes through the hub 5 and is fixedly connected to the hub 5. The hub 5 is provided with a combined oil-gas seal 6 and an inflation / deflation channel. Both the axle head 1 and the bushing 8 are provided with communicating inflation / deflation holes, and the inflation / deflation holes are connected to the inflation / deflation channel provided in the hub 5. Combined oil-gas seals 6 are provided on both sides of the inflation / deflation channel.

[0024] The lower end of the inflation / deflation channel is connected to the inflation / deflation hole at the connection between the axle head 1 and the bushing 8. The upper end of the inflation / deflation channel is equipped with a wheel valve, which is connected to the tire. The upper end of the inflation / deflation hole of the axle head 1 is connected to the inflation / deflation hole of the bushing 8. The lower end of the inflation / deflation hole of the axle head 1 is equipped with a connector, which is connected to the vehicle's air source.

[0025] Gas from the vehicle's air supply enters the inflation / deflation channel of the wheel hub 5 through the connector and inflation / deflation hole on the axle head 1, then through the inflation / deflation hole on the bushing 8, and finally through the wheel valve at the upper end of the inflation / deflation channel of the wheel hub 5, thus inflating the tires. Similarly, when the tires need to be deflated, the process is reversed. Since the wheel hub 5 rotates via the axle head 1 during vehicle operation, the inflation / deflation channel of the wheel hub 5 remains connected to the axle head 1 and the inflation / deflation hole on the bushing 8, enabling gas to be transferred from a stationary pipeline to the rotating wheel and tires. The inflation / deflation of the vehicle's tires during operation is regulated by controlling the supply of the vehicle's air supply. A combined oil-air seal 6 is installed; the oil seal isolates the lubricating oil from the high-pressure air, ensuring the structure's sealing performance. The air seal quickly dissipates the heat generated by friction during inflation / deflation, effectively reducing the operating temperature of the sealing components.

[0026] Example 2

[0027] like Figure 2 As shown, the combined oil-gas seal 6 includes a skeleton 61, an oil seal lip 62, a thermally conductive insulating ring 63, a gas seal lip 64, and a fixing gasket 65; the skeleton 61 has an oil seal lip 62 on one side; the skeleton 61 has a gas seal lip 64 on the other side; the thermally conductive insulating ring 63 is provided between the oil seal lip 62 and the gas seal lip 64; one side of the gas seal lip 64 is connected to the thermally conductive insulating ring 63; the other side of the gas seal lip 64 is connected to the fixing gasket 65.

[0028] The gas sealing lip 64 of the combined oil-gas seal 6 is adjacent to the inflation / deflation channel of the wheel hub 5; the combined oil-gas seal 6 is limited by the limiting platform of the wheel hub 5 and positioned by the inner retaining ring 3 and the outer retaining ring 7 of the wheel hub 5.

[0029] An adjusting shim ring 4 is also provided between the inner retaining ring 3 and the combined oil and gas seal 6.

[0030] The combined oil-gas seal 6 is provided with an oil seal lip 62 and a bushing 8, which are fitted with a sealing ring 9.

[0031] The thermally conductive spacer ring 63 is made of aluminum alloy.

[0032] The gas sealing lip 64 is made of polytetrafluoroethylene or polytetrafluoroethylene composite material.

[0033] The oil seal lip 62 isolates the lubricating oil from the high-pressure air during charging and discharging, while ensuring sealing performance. The combined oil-air seal 6 generates significant friction during operation, making it prone to grooving of the shaft head 1 and high-temperature failure of the combined oil-air seal 6, severely impacting vehicle safety and failing to meet the requirements of harsh operating conditions. In contrast, the air seal lip 64 in this application uses polytetrafluoroethylene (PTFE) or PTFE vinyl composite material, which has high rigidity, elasticity, and wear resistance. When not in operation, it is relatively loose, resulting in less friction with the shaft head 1 and less heat generation. At that time, due to the action of high-pressure gas, the gas seal lip 64 and the heat-conducting isolation ring 63 are in close contact, thereby quickly dissipating the heat generated by friction, effectively reducing the working temperature of the combined oil-gas seal 6, and improving the working reliability of the central charging and discharging structure. Because aluminum alloy has high strength and good thermal conductivity, the heat-conducting isolation ring 63 is made of aluminum alloy so that the heat generated by friction can be quickly dissipated. Because the interference fit between the combined oil-gas seal 6 and the shaft head 1 is set relatively large, an adjusting shim ring 4 is set to adjust the structural fit position, and the adjusting shim ring 4 can be removed from the assembly according to the structural adjustment requirements.

[0034] Example 3

[0035] like Figure 3 As shown, the oil seal lip 62, gas seal lip 64, thermally conductive insulating ring 63, and fixing gasket ring 65 are uniformly encapsulated by the skeleton 61, and the assembly of the combined oil and gas seal 6 in the central inflation and deflation structure can be completed in one press-fitting, thereby effectively improving the assembly efficiency of the product.

Claims

1. A novel central inflation / deflation structure for a drive axle, characterized in that: The assembly includes a shaft head (1), a bushing (8), a hub (5), and a combined oil-gas seal (6); the bushing (5) is fixedly connected to the shaft head (1); the shaft head (1) passes through the hub (5) and is fixedly connected to the hub (5); the hub (5) is provided with the combined oil-gas seal (6) and an inflation / deflation channel; both the shaft head (1) and the bushing (8) are provided with communicating inflation / deflation holes, and the inflation / deflation holes are connected to the inflation / deflation channel provided on the hub (5); combined oil-gas seals (6) are provided on both sides of the inflation / deflation channel. The combined oil-gas seal (6) includes a skeleton (61), an oil seal lip (62), a thermally conductive insulating ring (63), a gas seal lip (64), and a fixing washer (65); the oil seal lip (62) is provided on one side of the skeleton (61); the gas seal lip (64) is provided on the other side of the skeleton (61); a thermally conductive insulating ring (63) is provided between the oil seal lip (62) and the gas seal lip (64); one side of the gas seal lip (64) is connected to the thermally conductive insulating ring (63); the other side of the gas seal lip (64) is connected to the fixing washer (65).

2. The novel central inflation / deflation structure for the drive axle according to claim 1, characterized in that, The lower end of the inflation / deflation channel is connected to the inflation / deflation hole provided at the connection between the axle head (1) and the bushing (8). The upper end of the inflation / deflation channel is provided with a wheel valve, which is connected to the tire. The upper end of the inflation / deflation hole of the axle head (1) is connected to the inflation / deflation hole of the bushing (8). The lower end of the inflation / deflation hole of the axle head (1) is provided with a connector, which is connected to the vehicle air source.

3. The novel drive axle central inflation / deflation structure according to claim 1, characterized in that, The gas sealing lip (64) of the combined oil-gas seal (6) is adjacent to the inflation / deflation channel of the hub (5); the combined oil-gas seal (6) is limited by the limiting platform of the hub (5) and positioned by the inner retaining ring (3) and the outer retaining ring (7) of the hub (5).

4. The novel central inflation / deflation structure for the drive axle according to claim 3, characterized in that, An adjusting shim (4) is also provided between the inner retaining ring (3) and the combined oil and gas seal (6).

5. The novel central inflation / deflation structure for the drive axle according to claim 1, characterized in that, The combined oil seal (6) has an oil seal lip (62) and a sealing ring (9) fitted onto the bushing (8).

6. The novel drive axle central inflation / deflation structure according to claim 1, characterized in that, The thermally conductive spacer ring (63) is made of aluminum alloy.

7. The novel central inflation / deflation structure for the drive axle according to claim 3, characterized in that, The gas sealing lip (64) is made of polytetrafluoroethylene or polytetrafluoroethylene composite material.

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