Tire inflation structure of axle assembly and axle assembly

Abstract

The utility model discloses a tire inflation structure of an axle assembly and the axle assembly. The tire inflation structure of the axle assembly comprises an axle, a hub, a tire installed on the hub, a hub cover, a rotor and a stator. The rotor is connected to the hub cover in a penetrating mode and comprises a first end and a second end, and a mounting hole and a flow guide hole are formed in the rotor. The inner side end of the mounting hole extends to the first end to form an opening, the outer side end of the flow guide hole extends to the outer surface of the second end and is communicated with an inner cavity of the tire through a pipeline, a clamping part is arranged on the outer periphery of the rotor, a locking nut is in threaded connection with the outer portion of the rotor, and the hub cover is clamped by the locking nut and the clamping part; the stator penetrates into the mounting hole from the opening of the mounting hole to be in pivot fit with the rotor, a conducting hole is formed in the stator, one end of the conducting hole is communicated with the flow guide hole, and the other end of the conducting hole is communicated to an air source of the vehicle through a connecting pipe located in the axle. The pipeline joint cannot be extruded and pulled during assembly, a pipeline with a fixed length is convenient to configure, and the pipeline joint is easy to assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicles, in particular to a tire inflation structure of an axle assembly and the axle assembly. Background Art

[0002] Traditional commercial vehicles do not have automatic tire inflation structures on their steering axles. If tire pressure drops or leaks during driving, it will have a significant impact on vehicle safety. To solve this problem, some existing commercial vehicle axle assemblies are usually equipped with tire inflation structures, which connect the air source on the vehicle to the inner cavity of the tire. The tire pressure detection device detects the tire pressure in real time. When the tire pressure is too low, the inflation structure replenishes gas into the inner cavity of the tire, thereby ensuring that the tire pressure can always remain in a normal state, improving the driving safety of the vehicle.

[0003] Since the wheel hub rotates relative to the axle, the existing tire inflation structure usually adopts a rotary joint to achieve the connection of the air path. The rotary joint includes a stator and a rotor that rotate relatively. The rotor is fixed on the wheel hub or the hub cover so that the rotor can rotate synchronously with the tire, that is, the rotor and the tire remain relatively fixed, and the stator and the axle remain relatively fixed. A stator air guide channel connected to the air source of the vehicle is provided on the stator, and a rotor air guide channel connected to the inner cavity of the tire of the vehicle is provided on the rotor. The stator air guide channel is connected to the rotor air guide channel and together constitutes an air path channel that connects the air source with the inner cavity of the tire. When the existing tire inflation structure is assembled, the stator is usually fixed to the wheel hub cover. When the wheel end of the axle assembly is assembled, the wheel hub cover is screwed to the wheel hub and the wheel hub is rotated, so that the wheel hub cover moves along the axial direction of the axle, driving the rotor to move along the axial direction of the axle, thereby squeezing the joint connecting the rotor and the axle in the axial direction, causing the joint to loosen and leak, or even loosen. In addition, when the wheel hub cover is screwed to the wheel hub, the initial placement position of the wheel hub cover has a deviation in the radial direction, resulting in the central axis of the stator not being able to coincide well with the central axis of the wheel hub, or the central axis of the stator and the central axis of the wheel hub have a deviation due to processing errors. When the wheel hub cover is rotated, the pipeline connected to the stator will be twisted and deformed. After the wheel hub cover is installed in place, it is difficult to ensure that the joint on the stator and the inflation joint on the tire are aligned in the circumferential direction of the wheel hub, and the length of the inflation joint connecting the stator and the tire cannot be determined, which causes inconvenience to the installation. In short, the existing tire inflation structure is not conducive to the shaft end assembly of the axle assembly. Utility Model Content

[0004] In view of the deficiencies in the prior art, the first object of the utility model is to provide a tire inflation structure of an axle assembly that is easy to assemble.

[0005] The second purpose of the utility model is to provide a vehicle axle assembly.

[0006] In order to achieve the above purpose one, the utility model adopts the following technical solution:

[0007] A tire inflation structure of an axle assembly, including an axle, a wheel hub, a tire mounted on the wheel hub, a hub cover, a rotor, and a stator;

[0008] The wheel hub is pivotally connected to the axle, and the hub cover is fixedly connected to the outer end of the wheel hub;

[0009] The rotor is connected to the hub cover, and includes a first end extending into the inner side of the hub cover, and a second end located outside the hub cover. A mounting hole and a guide hole are provided inside the rotor. The mounting hole extends along the axial direction of the rotor and its central axis coincides with the central axis of the wheel hub; the inner end of the mounting hole extends to the first end to form an opening, the outer end of the guide hole extends to the outer surface of the second end and is connected to the inner cavity of the tire through a pipeline, the outer periphery of the rotor is provided with a clamping part located inside the hub cover, a locking nut is screwed to the outside of the rotor, and the locking nut and the clamping part clamp the hub cover to fix the rotor and the hub cover; the stator is inserted into the mounting hole through the opening of the mounting hole to pivotally cooperate with the rotor, and a conducting hole extending from one end face to the other end face is provided on the stator, one end of the conducting hole is connected to the guide hole, and the other end is connected to the air source of the vehicle through a connecting pipe located inside the axle.

[0010] A roller bearing is arranged in the mounting hole, the outer ring of the roller bearing is fixedly matched with the inner wall of the mounting hole, and the outer peripheral surface of the stator is fixedly matched with the inner ring of the roller bearing.

[0011] The inner wall of the mounting hole is provided with a first step surface, and the outer end of the outer ring of the roller bearing is pressed against the first step surface. A washer is provided on the inner side of the roller bearing in the mounting hole, and the washer is pressed on the inner end of the outer ring of the roller bearing. A clamping piece is clamped in the mounting hole, and the clamping piece is pressed against the inner side of the washer to press the washer against the inner end of the outer ring of the roller bearing.

[0012] The inner wall of the mounting hole is provided with a second step surface, the outer edge surface of the stator is provided with a limiting flange protruding radially outward, the limiting flange abuts against the second step surface, and the outer edge surface of the stator is also provided with a third step surface abutting against the outside of the gasket.

[0013] An annular clamping groove is arranged on the inner wall of the mounting hole, and the clamping piece is a clamping spring clamped in the annular clamping groove.

[0014] The clamping part is an inner nut threaded on the rotor, the inner nut is located on the inner side of the locking nut and cooperates with the locking nut to clamp the hub cover.

[0015] The clamping part is a protrusion protruding radially outward from the outer edge surface of the first end of the rotor. The hub cover is provided with an escape groove for the protrusion to pass through. The hub cover is clamped between the locking nut and the protrusion.

[0016] The guide hole extends radially along the rotor, with its outer end extending to the outer circumference of the rotor and the inner end extending to the middle of the rotor. The outer end of the stator extends into the inner end of the guide hole to connect the outer end of the guide hole with the inner end of the guide hole.

[0017] The two ends of the guide hole extend to both sides of the outer edge surface of the first end of the rotor respectively, the middle of the guide hole is connected to the outer end of the stator's guide hole, and the two ends of the guide hole are connected to the inner cavities of the two tires through pipelines respectively.

[0018] In order to achieve the above-mentioned second purpose, the utility model adopts the following technical solutions:

[0019] The vehicle axle assembly comprises the tire inflation structure of the vehicle axle assembly.

[0020] The beneficial effects of the utility model are:

[0021] During assembly, the rotor of the utility model does not rotate with the rotation of the hub cover, so that when the hub cover is rotated, the rotor does not move along the axial direction of the axle, thereby avoiding the displacement of the stator in the axial direction of the axle, which causes squeezing or pulling of the pipe joint on the axle. In addition, after the hub cover is tightened onto the wheel hub, the axial position and circumferential angle of the rotor can be adjusted to prevent the pipe connecting the stator and the axle from being squeezed, and the rotor can be rotated to adjust the joint at the outer end of the guide hole on the rotor and the joint on the rim of the tire to the same plane, so that a fixed-length pipe can be arranged between the outer end of the guide hole and the tire. In short, during the assembly process, the utility model does not squeeze or pull the pipe joint, so it is convenient to arrange a fixed-length pipe, ensure that the inflation structure has better sealing performance, and make the wheel end of the entire axle assembly easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of an embodiment of the utility model;

[0023] Figure 2 for Figure 1 Magnified view at A in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of an embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of an assembly of an embodiment of the utility model;

[0026] Figure 5 for Figure 4 Schematic diagram of the structure of the middle rotor;

[0027] Figure 6 for Figure 4 Schematic diagram of the structure of the stator;

[0028] Figure 7 It is a structural schematic diagram of another embodiment of the utility model. DETAILED DESCRIPTION

[0029] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0030] like Figure 1 , 2, 3, 4, 5, and 6 show a tire inflation structure of an axle assembly of an embodiment of the utility model, which includes an axle 10, a wheel hub 20, a tire 60 mounted on the wheel hub 20, a hub cover 30, a rotor 40, and a stator 50. The wheel hub 20 is mounted on the end of the axle 10 through two bearings, the hub cover 30 is fixedly connected to the outer end of the wheel hub 20, a rim 61 is mounted on the periphery of the wheel hub 20, the tire 60 is mounted on the rim 61, the rotor 40 is connected to the hub cover 30 and has a columnar structure, including a first end 405 extending into the inner side of the hub cover 30, and a second end 406 located on the outer side of the hub cover 30, the rotor 40 is provided with a mounting hole 401 and a guide hole 403 inside, and the mounting The hole 401 extends along the circumference of the rotor 40, and its central axis coincides with the central axis of the hub 20. The mounting hole 401 extends from the first end 405 to the second end 406, so that the inner end of the mounting hole 401 forms an opening 407 at the first end 405. The guide hole 403 is located at a position on the rotor 40 close to the second end 406. The guide hole 403 can be set to extend along the radial direction of the rotor 40 or approximately along the radial direction of the rotor 40, and the outer end of the guide hole 403 extends to the outer surface of the second end 406. In addition, a joint 404 is provided at the outer end of the guide hole 403, and a joint 62 is provided on the rim 61. The joint 404 and the joint 62 are connected through a pipeline, so that the guide hole 403 is connected to the outer surface of the second end 406. The outer end of the guide hole 403 is connected to the inner cavity of the tire 60, and the inner end of the guide hole 403 extends to the central axis of the rotor 40, so that the inner end of the guide hole 403 coincides with the outer end of the mounting hole 401 in the radial direction of the rotor 40, or the inner end of the guide hole 403 is directly connected to the outer end of the mounting hole 401; an inner nut 41 located on the inner side of the hub cover 30 and a locking nut 42 located on the outer side of the hub cover 30 are provided on the outer periphery of the rotor 40, and the inner nut 41 and the locking nut 42 are both screwed on the rotor 40, and a clamping portion is formed on the inner side of the hub cover 30 by using the inner nut 41, and the locking nut 42 is tightened, so that the hub cover 30 can be clamped by using the inner nut 41 and the locking nut 42, and then the rotor 40 is rotated. The rotor 40 is fixedly matched with the hub cover 30; the stator 50 is a slender tube structure, which is inserted into the mounting hole 401 through the opening 407 of the mounting hole 401. The central axis of the stator 50 coincides with the central axis of the rotor 40 and the stator 50 and the rotor 40 are pivotally matched. The stator 50 is provided with a conducting hole 51 extending from its inner end surface to the outer end surface. After the stator 50 is inserted into the mounting hole 401 and installed in place, the outer end of the stator 50 is located at a predetermined axial position of the rotor 40, so that the outer end of the conducting hole 51 is connected to the inner end of the guide hole 403, and the inner end of the stator 50 is connected to the connecting pipe 501, and the inner end of the conducting hole 51 is connected to the air source of the vehicle through the connecting pipe 501.The outer end of the conducting hole 51 may be connected to the guide hole 403 by adopting the following structure. For example, the outer end of the stator 50 may be passed through the mounting hole 401 and then directly extended into the guide hole 403, or the outer end of the mounting hole 401 may be extended to the inner end of the guide hole 403 and the outer end of the stator 50 may be connected to a position in the mounting hole 401 close to the guide hole 403.

[0031] During assembly, the stator 50 is installed into the installation hole 401 of the rotor 40 so that the stator 50 and the rotor 40 form an assembly. After the assembly passes through the preset hole in the middle of the hub cover 30, the inner nut 41 and the locking nut 42 are respectively sleeved on the rotor 40 from the first end 405 and the second end 406 of the rotor 40, and the locking nut 42 and the inner nut 41 maintain a certain distance from the inner and outer surfaces of the hub cover 30, that is, at least the locking nut 42 is in an untightened state. Then, the hub cover 30 is rotated and tightened to the end of the wheel hub 20. The angle of the rotor 40 is adjusted so that the joint 404 on the rotor 40 and the joint 62 on the rim 61 are on the same plane. Finally, the locking nut 42 is tightened, and the hub cover 30 is clamped by the locking nut 42 and the inner nut 41, so that the stator 50 and the hub cover 30 are kept fixed.

[0032] During assembly, the rotor of the utility model does not rotate with the rotation of the hub cover, so that when the hub cover is rotated, the rotor does not move along the axial direction of the axle, thereby avoiding the displacement of the stator in the axial direction of the axle, which causes squeezing or pulling of the pipe joint on the axle. In addition, after the hub cover is tightened onto the wheel hub, the axial position and circumferential angle of the rotor can be adjusted to prevent the pipe connecting the stator and the axle from being squeezed, and the rotor can be rotated to adjust the joint at the outer end of the guide hole on the rotor and the joint on the rim of the tire to the same plane, so that a fixed-length pipe can be arranged between the outer end of the guide hole and the tire. In short, during the assembly process, the utility model does not squeeze or pull the pipe joint, so it is convenient to arrange a fixed-length pipe, ensure that the inflation structure has better sealing performance, and make the wheel end of the entire axle assembly easy to assemble.

[0033] In a preferred embodiment, the utility model sets a roller bearing 45 inside the mounting hole 401, the outer ring of the roller bearing 45 is fixed to the mounting hole 401 by interference fit, the outer circumferential surface of the stator 50 is fixed to the inner ring of the roller bearing 45 by interference fit, and the stator 50 and the rotor 40 are pivotally connected together by the roller bearing 45. A first step surface 409 is set on the inner wall of the mounting hole 401, and the outer end of the outer ring of the roller bearing 45 abuts on the first step surface 409. A washer 43 is set at the inner side end of the outer ring of the roller bearing 45 inside the mounting hole 401, and the washer 43 is pressed on the inner side end of the outer ring of the roller bearing 45. A retaining spring 44 is also clamped in the mounting hole 401, and the retaining spring 44 is pressed on the inner side of the washer 43, so that the washer 43 is pressed on the inner end of the outer ring of the roller bearing 45. In this way, the axial movement of the roller bearing 405 is limited by the washer 43 and the first step surface 409. A second step surface 402 is also provided on the inner wall of the mounting hole 401, and a limiting flange 52 is provided on the outer edge surface of the stator 50, which protrudes radially outward. When the stator 50 is installed in place inside the mounting hole 401, the limiting flange 52 abuts against the second step surface 402. A third step surface 53 is also provided on the outer edge surface of the stator 50, and the third step surface 53 abuts against the outer side of the gasket 43. In this way, the gasket 43 cooperates with the third step surface 53 to limit the freedom of the stator 50 to move inward, and the limiting flange 52 cooperates with the second step surface 402 to limit the freedom of the stator 50 to move outward. During assembly, the gasket 43 is used to simultaneously press the outer ring of the roller bearing 45 and the stator 50. In order to facilitate installation, an annular groove 408 is provided on the inner wall of the mounting hole 401, and the retaining spring 44 is clamped in the annular groove 408 as a clamping member. In other embodiments, the gasket 43 may be compressed by using other structural forms of clamping parts.

[0034] In the above-mentioned embodiment of the utility model, the guide hole 403 is arranged to extend along the radial direction of the rotor 40 or approximately along the radial direction of the rotor 40, so that the joint 404 at the outer end of the guide hole 403 is located on the outer edge surface of the second end 406 of the rotor 50. In fact, in other embodiments, the guide hole 403 may be arranged to extend along the circumferential direction of the rotor 40, so that the outer end of the guide hole 403 extends to the end surface of the second end 406 of the rotor 50, or the guide hole 403 forms an angle with the axial direction of the rotor 40, so that the outer end of the guide hole 403 extends to the end surface of the second end 406 of the rotor 50.

[0035] In a preferred embodiment, the guide hole 403 forms an outlet on the surface of the rotor 40. For example, the guide hole 403 extends along the radial direction of the rotor 40, and its two ends extend to the two sides of the outer edge surface of the first end 406 of the rotor 40 respectively. The middle part of the guide hole 403 is connected to the outer end of the guide hole 51 of the stator 50. A connector 404 is installed at each end of the guide hole 403. Two rims 61 are installed on the wheel hub 20. Each rim 61 is equipped with a tire 60. The two connectors 404 are connected to the connectors 62 on the two rims 61 through pipelines. In this way, the guide hole 403 is connected to the inner cavity of the two tires 60 respectively, and then the two tires at the wheel ends of the axle assembly can be inflated.

[0036] See also Figure 7 As shown, a tire inflation structure of an axle assembly of another embodiment of the utility model is provided. A protrusion 81 protruding radially outwardly along the rotor 80 is provided on the outer edge surface of the first end 801 of the rotor 80. A hole 71 and an escape groove 72 extending outwardly from the edge of the hole 71 are provided on the hub cover 70. The escape groove 72 is of the same shape as the protrusion 81. During assembly, the protrusion 81 is aligned with the escape groove 72, so that the first end 801 of the rotor 80 passes through the hub cover 70. When the rotor 80 needs to be fixed to the hub cover 30, the rotor 80 is rotated to a certain angle, and then the locking nut 82 is tightened. The hub cover 70 is clamped by the locking nut 82 and the protrusion 81, and then the rotor 80 and the hub cover 70 are kept fixed. The protrusion 81 can be welded on the rotor 80. After the locking nut 82 is firstly put on the rotor 80, the protrusion 81 is welded to the outer edge surface of the first end 801 of the rotor 80. The other structures of this embodiment are Figure 1 The embodiments shown are the same and will not be described repeatedly here.

[0037] The axle assembly of the utility model includes the tire inflation structure of the axle assembly described above. Other structures of the axle assembly are the same as those in the prior art and will not be described in detail here.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. The tire inflation structure of the axle assembly is characterized in that: It includes an axle, a wheel hub, a tire mounted on the wheel hub, a hub cover, a rotor, and a stator; The wheel hub is pivotally connected to the axle, and the hub cover is fixedly connected to the outer end of the wheel hub; The rotor is connected to the hub cover, and includes a first end extending into the inner side of the hub cover, and a second end located outside the hub cover. A mounting hole and a guide hole are provided inside the rotor. The mounting hole extends along the axial direction of the rotor and its central axis coincides with the central axis of the wheel hub; the inner end of the mounting hole extends to the first end to form an opening, the outer end of the guide hole extends to the outer surface of the second end and is connected to the inner cavity of the tire through a pipeline, the outer periphery of the rotor is provided with a clamping part located inside the hub cover, a locking nut is screwed to the outside of the rotor, and the locking nut and the clamping part clamp the hub cover to fix the rotor and the hub cover; the stator is inserted into the mounting hole through the opening of the mounting hole to pivotally cooperate with the rotor, and a conducting hole extending from one end face to the other end face is provided on the stator, one end of the conducting hole is connected to the guide hole, and the other end is connected to the air source of the vehicle through a connecting pipe located inside the axle.

2. The tire inflation structure of the axle assembly according to claim 1, characterized in that: A roller bearing is arranged in the mounting hole, the outer ring of the roller bearing is fixedly matched with the inner wall of the mounting hole, and the outer peripheral surface of the stator is fixedly matched with the inner ring of the roller bearing.

3. The tire inflation structure of the axle assembly according to claim 2, characterized in that: The inner wall of the mounting hole is provided with a first step surface, and the outer end of the outer ring of the roller bearing is pressed against the first step surface. A washer is provided on the inner side of the roller bearing in the mounting hole, and the washer is pressed on the inner end of the outer ring of the roller bearing. A clamping piece is clamped in the mounting hole, and the clamping piece is pressed against the inner side of the washer to press the washer against the inner end of the outer ring of the roller bearing.

4. The tire inflation structure of the axle assembly according to claim 3, characterized in that: The inner wall of the mounting hole is provided with a second step surface, the outer edge surface of the stator is provided with a limiting flange protruding radially outward, the limiting flange abuts against the second step surface, and the outer edge surface of the stator is also provided with a third step surface abutting against the outside of the gasket.

5. The tire inflation structure of the axle assembly according to claim 3, characterized in that: An annular clamping groove is arranged on the inner wall of the mounting hole, and the clamping piece is a clamping spring clamped in the annular clamping groove.

6. The tire inflation structure of the axle assembly according to claim 1, characterized in that: The clamping part is an inner nut threaded on the rotor, the inner nut is located at the inner side of the locking nut and cooperates with the locking nut to clamp the hub cover.

7. The tire inflation structure of the axle assembly according to claim 1, characterized in that: The clamping part is a protrusion protruding radially outward from the outer edge surface of the first end of the rotor. The hub cover is provided with an escape groove for the protrusion to pass through. The hub cover is clamped between the locking nut and the protrusion.

8. The tire inflation structure of the axle assembly according to claim 1, characterized in that: The guide hole extends radially along the rotor, with its outer end extending to the outer circumference of the rotor and the inner end extending to the middle of the rotor. The outer end of the stator extends into the inner end of the guide hole to connect the outer end of the guide hole with the inner end of the guide hole.

9. The tire inflation structure of the axle assembly according to claim 1, characterized in that: The two ends of the guide hole extend to both sides of the outer edge surface of the first end of the rotor respectively, the middle of the guide hole is connected to the outer end of the stator's guide hole, and the two ends of the guide hole are connected to the inner cavities of the two tires through pipelines respectively.

10. Axle assembly, characterized in that: A tire inflation structure comprising the axle assembly according to any one of claims 1 to 9.

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