Rotary seal structure for a vehicle central tire inflation system

Abstract

The utility model discloses a rotary seal structure of vehicle central tire inflation and deflation system, including, dynamic ring, static ring, half axle air inlet pipeline and electromagnetic pushing mechanism, the radial section of dynamic ring is horizontally arranged U shape, sets up in the upper half axle and rotates with half axle together, the radial setting of dynamic ring inner wall has air inlet hole I, static ring is discoid, sets up in the opposite surface of dynamic ring and does not rotate with half axle together, sets up on the disc body of static ring axial air inlet hole II, and air inlet hole II corresponds with the U shape opening of dynamic ring, half axle air inlet pipeline includes radial hole and center hole, electromagnetic pushing mechanism fixedly sets up in static ring outside, pushes static ring relative dynamic ring axial movement, the utility model discloses beneficial technical effects can effectively avoid the problem that the sealing surface is easy to lead to leakage or wear because of lacking dynamic lubrication when vehicle stops, simultaneously, still provided a kind of method for the vehicle installation central tire inflation and deflation system of solid half axle.

Description

Technical Field

[0001] This utility model relates to vehicle central tire inflation / deflation technology, and more particularly to a rotary sealing structure for a vehicle central tire inflation / deflation system. Background Technology

[0002] Central tire inflation / deflation technology refers to a system that improves a vehicle's driving performance on different road surfaces by controlling the air pressure in each tire. For example, when driving on soft surfaces, appropriately lowering the tire pressure increases the contact area between the tire and the ground, making the vehicle easier to drive and reducing damage to the road surface. When driving at high speeds, appropriately increasing the tire pressure prevents tire damage and reduces friction. Additionally, it can maintain the internal air pressure when a tire experiences a slow leak or is punctured. Of course, the driver needs to preset the appropriate tire pressure for each situation, and the system will maintain that pressure accordingly.

[0003] One of the key structural features of existing central tire inflation / deflation systems is the dynamic seal. This dynamic seal refers to a pair of sealing rings installed in the high-pressure gas transmission pipeline. One ring, located on the tire side and rotating with the tire, is typically called the moving ring; the other ring, located on the vehicle frame side and not rotating with the tire, is typically called the stationary ring. The stationary ring has a through-hole, and a dynamic sealing chamber is located on the moving ring side. When tire inflation is needed, high-pressure gas enters the dynamic sealing chamber through the through-hole on the stationary ring, and then connects to the tire valve for inflation / deflation via the pipeline within the dynamic sealing chamber. When the vehicle is stationary, the axle stops rotating, and the sealing surface of the dynamic seal is prone to leakage or wear due to the lack of dynamic lubrication.

[0004] Furthermore, existing central tire inflation / deflation systems are mostly installed on vehicles with hollow half-shafts to utilize the hollow half-shafts for high-pressure gas transmission. For ordinary passenger cars, whose half-shafts are all solid axles, it is more difficult to install a central tire inflation / deflation system.

[0005] Clearly, existing central tire inflation / deflation systems suffer from problems such as being prone to leakage or wear and being difficult to install in ordinary passenger vehicles. Summary of the Invention

[0006] To address the problems of leakage or wear in existing central tire inflation / deflation systems and the difficulty in setting them up in ordinary passenger vehicles, this utility model proposes a rotary sealing structure for a vehicle central tire inflation / deflation system.

[0007] This utility model relates to a rotary sealing structure for a vehicle central tire inflation / deflation system, comprising a rotating ring, a stationary ring, a half-shaft air intake pipe, and an electromagnetic actuation mechanism. The rotating ring has a transverse U-shaped radial cross-section, is mounted on the half-shaft, and rotates with the half-shaft. An air intake hole I is radially provided on the inner wall of the rotating ring. The stationary ring is disc-shaped, positioned opposite the rotating ring, and does not rotate with the half-shaft. An axial air intake hole II is provided on the disc of the stationary ring, and the air intake hole II corresponds to the U-shaped opening of the rotating ring. The half-shaft air intake pipe includes a radial hole and a central hole. The radial hole is coaxial with the air intake hole I on the rotating ring, and the central hole extends from the center of the inner end of the half-shaft to the center end of the radial hole and is connected to the radial hole. The electromagnetic actuation mechanism is fixedly mounted on the outside of the stationary ring, driving the stationary ring to move axially relative to the rotating ring.

[0008] Furthermore, the rotary sealing structure is provided with a housing on its outer side, including a rotating ring outer housing and a stationary ring outer housing; the rotating ring outer housing is horizontally L-shaped and located outside the rotating ring, and one end of the L-shaped rotating ring outer housing is connected to the half shaft through a bearing and does not rotate with the half shaft, while the other end is connected to the stationary ring outer housing; the stationary ring outer housing is horizontally U-shaped with its opening pointing towards the rotating ring and located outside the stationary ring, the bottom end of the horizontally U-shaped stationary ring outer housing is clearance-fitted with the half shaft and does not rotate with the half shaft, and the top end is provided with an air inlet, and the two sides of the top end are respectively connected to the rotating ring outer housing and the vehicle steering knuckle.

[0009] Furthermore, an O-ring is provided between the outer side of the inner circle of the moving ring and the surface of the half shaft; an O-ring is provided between the inner and outer circles of the stationary ring and the corresponding surfaces of the outer shell of the U-shaped stationary ring.

[0010] The beneficial technical effect of the rotary sealing structure of the vehicle central tire inflation / deflation system of this utility model is that it can effectively avoid the problem of leakage or wear of the sealing surface due to lack of dynamic lubrication when the vehicle is stopped. At the same time, it also provides a method for installing a central tire inflation / deflation system on vehicles with solid half shafts. Attached Figure Description

[0011] Appendix Figure 1 This is a cross-sectional schematic diagram of the rotary sealing structure (open state) of the vehicle central tire inflation / deflation system of this utility model.

[0012] Appendix Figure 2 This is a three-dimensional schematic diagram of the moving ring of this utility model;

[0013] Appendix Figure 3 This is a cross-sectional schematic diagram of the rotary sealing structure (closed state) of the vehicle central tire inflation / deflation system of this utility model.

[0014] In the diagram, 1 is the moving ring, 1-1 is the air inlet I; 2 is the stationary ring, 2-1 is the air inlet II; 3 is the half-shaft air inlet pipe, 3-1 is the radial hole, 3-2 is the center hole; 4 is the electromagnetic drive mechanism; 5 is the outer housing of the moving ring, 6 is the outer housing of the stationary ring, 6-1 is the air inlet III; and 7 is the O-ring seal.

[0015] The rotary sealing structure of the vehicle central tire inflation / deflation system of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0016] See appendix Figure 1 , 2 3. As shown in the figure, the rotary sealing structure of the vehicle central tire inflation / deflation system of this utility model includes a rotating ring 1, a stationary ring 2, a half-shaft air intake pipe 3, and an electromagnetic drive mechanism 4. The radial section of the rotating ring is a transverse U-shape, which is set on the half-shaft and rotates with the half-shaft. An air intake hole I1-1 is radially provided on the inner wall of the rotating ring. The stationary ring is a disc shape, which is set on the opposite side of the rotating ring and does not rotate with the half-shaft. An axial air intake hole II2-1 is provided on the disc of the stationary ring, and the air intake hole II corresponds to the U-shaped opening of the rotating ring. The half-shaft air intake pipe includes a radial hole 3-1 and a central hole 3-2. The radial hole is coaxial with the air intake hole I on the rotating ring, and the central hole extends from the center of the inner end of the half-shaft to the center end of the radial hole of the half-shaft and is connected to the radial hole. The electromagnetic drive mechanism is fixedly set on the outside of the stationary ring and pushes the stationary ring to move axially relative to the rotating ring. This utility model's vehicle central tire inflation / deflation system employs a rotary sealing structure with a rotating ring and a movable stationary ring working together to inflate or deflate the tire. When inflation or deflation is not needed (e.g., when the vehicle is stationary), the stationary ring disengages from the rotating ring, causing the dynamic sealing surface to disengage, thus preventing leakage or wear due to lack of dynamic lubrication. In operation, when vehicle or road conditions change and tire inflation is required, the electromagnetic drive mechanism moves the stationary ring towards the rotating ring until they are in close contact, forming a dynamic seal. High-pressure gas enters the cavity of the rotating ring's transverse U-shaped structure through the air inlet II on the stationary ring, then enters the radial hole on the half-shaft through the air inlet I on the rotating ring, and finally enters the pipeline connecting to the tire valve through the central hole of the half-shaft, inflating the tire. When partial deflation is required, the electromagnetic drive mechanism moves the stationary ring towards the rotating ring until they are in close contact, forming a dynamic seal. At this point, the gas flows in reverse, releasing some of the gas from the tire. When the car does not need to inflate or deflate the tires, the electromagnetic drive mechanism pulls the stationary ring back to its original position, separating the dynamic ring and the stationary ring. This prevents the sealing surface of the dynamic seal from leaking or wearing due to lack of dynamic lubrication.

[0017] As one of the preferred technical solutions, the rotary sealing structure is provided with a housing on its outer side, including a rotating ring outer housing 5 and a stationary ring outer housing 6. The rotating ring outer housing is horizontally L-shaped and located outside the rotating ring. One end of the L-shaped rotating ring outer housing is connected to the half-shaft via a bearing and does not rotate with the half-shaft, while the other end is connected to the stationary ring outer housing. The stationary ring outer housing is horizontally U-shaped with its opening pointing towards the rotating ring and located outside the stationary ring. The bottom end of the horizontally U-shaped stationary ring housing is clearance-fitted with the half-shaft, and the top end is provided with an air inlet Ⅲ6-1. The two sides of the top end are respectively connected to the rotating ring outer housing and the vehicle steering knuckle. The outer housing can protect the rotating ring and the stationary ring, preventing dust and other contaminants from contaminating the dynamic sealing surface. At the same time, high-pressure gas can enter from the air inlet Ⅲ at the top of the stationary ring outer housing and enter from the air inlet Ⅱ on the stationary ring, or exit from the air inlet Ⅱ on the stationary ring and then exit from the air inlet Ⅲ at the top of the stationary ring outer housing.

[0018] As a preferred technical solution, an O-ring seal 7 is provided between the outer inner circle of the moving ring and the surface of the half-shaft. O-ring seals 7 are also provided between the inner and outer circles of the stationary ring and the corresponding surfaces of the U-shaped stationary ring housing. Using O-ring seals effectively ensures a tight seal and facilitates replacement or maintenance.

[0019] Obviously, the beneficial technical effect of the rotary sealing structure of the vehicle central tire inflation / deflation system of this utility model is that it can effectively avoid the problem of leakage or wear of the sealing surface due to lack of dynamic lubrication when the vehicle is stopped. At the same time, it also provides a method for installing a central tire inflation / deflation system on vehicles with solid half shafts.

Claims

1. A rotary sealing structure for a vehicle central tire inflation / deflation system, characterized in that, The sealing structure includes a rotating ring, a stationary ring, a half-shaft air intake pipe, and an electromagnetic actuation mechanism. The rotating ring has a transverse U-shaped radial section, is mounted on the half-shaft, and rotates with the half-shaft. An air intake hole I is radially provided on the inner wall of the rotating ring. The stationary ring is disc-shaped, is mounted on the opposite side of the rotating ring, and does not rotate with the half-shaft. An axial air intake hole II is provided on the disc of the stationary ring, and the air intake hole II corresponds to the U-shaped opening of the rotating ring. The half-shaft air intake pipe includes a radial hole and a central hole. The radial hole is coaxial with the air intake hole I on the rotating ring, and the central hole extends from the center of the inner end of the half-shaft to the center end of the radial hole and is connected to the radial hole. The electromagnetic actuation mechanism is fixedly mounted on the outside of the stationary ring and drives the stationary ring to move axially relative to the rotating ring.

2. The rotary sealing structure of the vehicle central tire inflation / deflation system according to claim 1, characterized in that, The rotary sealing structure has a housing on its outer side, including a rotating ring outer housing and a stationary ring outer housing. The rotating ring outer housing is horizontally L-shaped and located outside the rotating ring. One end of the L-shaped rotating ring outer housing is connected to the half-shaft via a bearing, and the other end is connected to the stationary ring outer housing. The stationary ring outer housing is horizontally U-shaped with its opening pointing towards the rotating ring and located outside the stationary ring. The bottom end of the horizontally U-shaped stationary ring outer housing is clearance-fitted with the half-shaft and does not rotate with the half-shaft. An air inlet is provided at the top end, and the two sides of the top end are respectively connected to the rotating ring outer housing and the vehicle steering knuckle.

3. The rotary sealing structure of the vehicle central tire inflation / deflation system according to claim 1 or 2, characterized in that, An O-ring is provided between the outer side of the inner circle of the moving ring and the surface of the half shaft, and an O-ring is provided between the inner and outer circles of the stationary ring and the corresponding surfaces of the outer shell of the U-shaped stationary ring.

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