Pressure relief protection structure of trailer axle and trailer axle

Abstract

The utility model discloses a pressure relief protection structure of a trailer axle and the trailer axle. The pressure relief protection structure of the trailer axle comprises an axle, a hub, a hub cover, an inner bearing, an outer bearing and an oil seal. The hub is pivoted to the axle through the inner bearing and the outer bearing, and the oil seal is located on the inner side of the inner bearing and sealed between the inner edge face of the hub and the outer edge face of the axle. The hub cover is fixed at the outer side end of the hub and covers the outer sides of the axle and the outer bearing; a cavity is formed in the axle, and an exhaust hole for communicating the cavity with the external environment is formed in the axle; an end wall for isolating the cavity from the inner cavity of the hub is formed at the outer side end of the cavity, a pressure relief hole is formed in the end wall, a diaphragm for blocking the pressure relief hole is connected to one side, located on the cavity, of the end wall, and the diaphragm is used for deforming to open the pressure relief hole when the pressure of the inner cavity of the hub is larger than that of the cavity. The pressure of the inner cavity of the hub can be automatically adjusted, the pressure of the inner cavity of the hub is prevented from being too large, and therefore it is guaranteed that the oil seal has good sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicles, in particular to a pressure relief protection structure of a trailer axle and the trailer axle. Background Art

[0002] The wheel hub of a trailer axle is usually pivotally connected to the axle head of the axle through an inner bearing and an outer bearing. The wheel hub, the axle head, the inner bearing and the outer bearing together form a closed chamber. The interior of the chamber is filled with lubricating oil for lubricating the inner bearing and the outer bearing. A hub cover located outside the outer bearing is sealed on the outer end face of the wheel hub. An oil seal is arranged between the inner end of the wheel hub and the axle head to prevent the lubricating oil from leaking from the inner bearing. During driving of the vehicle, the friction between the inner ring and the outer ring of the inner bearing and the outer bearing causes the temperature inside the chamber to rise. As the temperature inside the chamber rises, the pressure inside the chamber increases. The oil seal is subjected to a large pressure inside the chamber, resulting in a decrease in the sealing performance of the oil seal, and the lubricating oil inside the chamber will leak from the oil seal. Utility Model Content

[0003] In view of the deficiencies in the prior art, the first object of the utility model is to provide a pressure relief protection structure for a trailer axle, which can prevent the pressure in the inner cavity of the wheel hub from being too high and ensure that the oil seal has better sealing performance.

[0004] The second purpose of the utility model is to provide a trailer axle.

[0005] In order to achieve the above purpose one, the utility model adopts the following technical solution:

[0006] The pressure relief protection structure of the trailer axle includes the axle, wheel hub, wheel hub cover, inner bearing, outer bearing, and oil seal;

[0007] The wheel hub is pivotally connected to the axle through an inner bearing and an outer bearing. The inner bearing is located on the inner side of the outer bearing and is arranged at a certain distance from the outer bearing. The oil seal is located on the inner side of the inner bearing and is sealed between the inner edge surface of the wheel hub and the outer edge surface of the axle. The wheel hub cover is fixed to the outer end of the wheel hub and covers the outer side of the axle and the outer bearing.

[0008] A cavity is formed inside the axle, and an exhaust hole is provided on the axle to connect the cavity with the external environment; an end wall is formed at the outer end of the cavity to isolate the cavity from the inner cavity of the wheel hub, and a pressure relief hole is provided on the end wall. A diaphragm for blocking the pressure relief hole is connected to the end wall on one side of the cavity, and the diaphragm is used to deform when the pressure in the inner cavity of the wheel hub is greater than the cavity pressure to open the pressure relief hole.

[0009] A one-way valve is installed at the exhaust hole, and the flow direction of the one-way valve is from the end of the exhaust hole connected with the cavity to the end of the exhaust hole connected with the external environment.

[0010] A joint is connected to the exhaust hole, and the one-way valve is a flexible check valve installed inside the joint, with an inlet of the flexible check valve facing the cavity and an outlet facing the outer end of the joint.

[0011] The inlet of the flexible check valve is sealed with a waterproof and breathable membrane.

[0012] A flange is arranged on the outer peripheral edge of the inlet of the flexible check valve, a step surface is arranged on the inner wall of the joint, the flange is tightly attached to the inner side of the step surface, the edge of the waterproof breathable membrane is tightly attached to the inner side of the flange, and a press ring is fixed inside the joint, which is pressed tightly to the inner side of the edge of the waterproof breathable membrane.

[0013] An internal thread is provided on the inner wall of the exhaust hole, and an external thread matching the internal thread is provided on the outer peripheral surface of the joint so that the joint can be screwed into the exhaust hole.

[0014] The outer end of the exhaust hole is connected with an air guide pipe, and a bending portion is arranged on the air guide pipe so that the end of the air guide pipe away from the joint extends downward.

[0015] The inside of the axle is provided with an axial hole extending to the end of the axle, a plugging cover is installed inside the axial hole, the end wall is arranged on the plugging cover, the periphery of the plugging cover is provided with a side wall which is tightly matched with the inner wall of the axial hole, and the diaphragm is fixedly connected to the inner side surface of the end wall.

[0016] In order to achieve the above-mentioned second purpose, the utility model adopts the following technical solutions:

[0017] A trailer axle comprises the above-mentioned pressure relief protection structure of the trailer axle.

[0018] The beneficial effects of the utility model are:

[0019] The utility model blocks the pressure relief hole by a diaphragm. When the pressure in the inner cavity of the wheel hub increases to a certain value, the pressure difference between the inner cavity of the wheel hub and the cavity causes the diaphragm to deform and open the pressure relief hole. The air in the inner cavity of the wheel hub flows into the cavity through the pressure relief hole. When the pressure in the inner cavity of the wheel hub is equivalent to the pressure inside the cavity, the diaphragm rebounds and blocks the pressure relief hole. In this way, the pressure in the inner cavity of the wheel hub can be automatically adjusted during the driving of the vehicle to avoid excessive pressure in the inner cavity of the wheel hub, thereby ensuring that the oil seal has better sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 for Figure 1 Structural schematic diagram of the middle plugging cover;

[0022] Figure 3 A schematic diagram of a working state of the utility model;

[0023] Figure 4 for Figure 1 Magnified view at A in the middle;

[0024] Figure 5 for Figure 1 Schematic diagram of the assembly of the center joint and the flexible check valve. DETAILED DESCRIPTION

[0025] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0026] like Figure 1 , 2 , 3, 4, and 5 show a pressure relief protection structure of a trailer axle of the present invention, which includes an axle 10, a wheel hub 20, a wheel hub cover 30, an inner bearing 21, an outer bearing 22, and an oil seal 23. The wheel hub 20 is pivotally connected to the axle 10 through the inner bearing 21 and the outer bearing 22. The inner bearing 21 is located on the inner side of the outer bearing 22. Specifically, the inner bearing 21 is located near the inner end of the wheel hub 20, and the outer bearing 22 is located near the outer end of the wheel hub 20, so that the inner bearing 21 and the outer bearing 22 are located at a position close to the inner end of the wheel hub 20. The oil seal 23 is arranged at a certain distance, and is located on the inner side of the inner bearing 21 and is sealed between the inner edge surface of the wheel hub 20 and the outer edge surface of the axle 10; the wheel hub cover 30 is fixed to the outer end of the wheel hub 20 and covers the outer side of the axle 10 and the outer bearing 22; in this way, the inner cavity of the wheel hub 20 is formed into a closed space by using the wheel hub cover 30 and the oil seal 23; a cavity 11 is formed inside the axle 10, and an exhaust hole 12 is provided in the middle of the length direction of the axle 10 to connect the cavity 11 with the external environment, and an exhaust hole 12 is provided at the end of the axle 10 to connect the cavity 11 with the external environment. The end wall 41 is provided with a pressure relief hole 43 for connecting the cavity 11 with the inner cavity of the wheel hub 20. A diaphragm 50 is connected to one side of the cavity 11 on the end wall 41. The diaphragm 50 is blocked at the pressure relief hole 43. When the pressure in the inner cavity of the wheel hub 20 is greater than the pressure in the cavity 11, the diaphragm 50 can be deformed under the action of the pressure difference. The deformed diaphragm 50 can open the pressure relief hole 43, so that the airflow enters the cavity 11 from the inner cavity of the wheel hub 20 through the pressure relief hole 43. In the cavity 11, excess air in the cavity 11 is discharged to the external environment through the exhaust hole 12; when the diaphragm 50 is connected to the end wall 41, one end of the diaphragm 50 is connected to the end wall 41, and the other end of the diaphragm 50 is a free end and covers the pressure relief hole 43. The free end of the diaphragm 50 can be deformed under the action of the pressure difference, so that the pressure relief hole 43 is opened. The diaphragm 50 and the pressure relief hole 43 form a pressure relief valve, and the pressure relief valve is unidirectional, which only allows airflow to enter the cavity 11 from the inner cavity of the hub 20.

[0027] During vehicle driving, the heat generated by the friction between the inner bearing 21 and the outer bearing 22 increases the pressure in the inner cavity of the wheel hub 20. When the pressure in the inner cavity of the wheel hub 20 increases to a certain value, the pressure difference between the inner cavity of the wheel hub 20 and the cavity 11 causes the diaphragm 50 to deform, opening the pressure relief hole 43, and the air in the inner cavity of the wheel hub 20 flows into the cavity 11 through the pressure relief hole 43. Therefore, when the pressure in the inner cavity of the wheel hub 20 is equivalent to the pressure inside the cavity 11, the diaphragm 50 rebounds to block the pressure relief hole 43. When the pressure in the inner cavity of the wheel hub 20 increases again, the diaphragm 50 opens again. In this way, during vehicle driving, the pressure in the inner cavity of the wheel hub 20 can be automatically adjusted to avoid excessive pressure in the inner cavity of the wheel hub 20, thereby ensuring that the oil seal has better sealing performance.

[0028] In a preferred embodiment, a one-way valve is installed at the exhaust hole 12, and the flow direction of the one-way valve is from the end of the exhaust hole 12 connected to the cavity 11 to the end of the exhaust hole 12 connected to the external environment, that is, only the airflow in the cavity 11 is allowed to flow out to the external environment through the exhaust hole 12. Specifically, a joint 60 is connected to the exhaust hole 12, and the one-way valve is a flexible check valve 62 installed inside the joint 60, the inlet of the flexible check valve 62 faces the cavity 11, and the outlet faces the outer end of the joint 60. The flexible check valve 62 is made of rubber, and its inlet is circular and the outlet is a long strip of slits. When the internal pressure of the cavity 11 is greater than the external environment pressure, the outlet of the flexible check valve 62 will open under the action of the pressure difference, so that the airflow inside the cavity 11 can be discharged to the external environment through the flexible check valve. On the contrary, when the external environment pressure is greater than the internal pressure of the cavity 11, the outlet of the flexible check valve 62 will be pressed and closed under the action of the pressure difference. The inlet of the flexible check valve 62 is sealed with a waterproof breathable membrane 63, which can prevent external water vapor from entering the cavity 11 through the flexible check valve 62, and at the same time ensure that when the internal pressure of the cavity 11 is too high, the air inside the cavity 11 can pass through the waterproof breathable membrane 63 and then be discharged to the external environment through the flexible check valve 62. In order to facilitate assembly, a flange 621 is provided on the outer periphery of the inlet of the flexible check valve 62, and a step surface is provided on the inner wall of the joint 60. The flexible check valve 62 is placed inside the joint 60 so that the flange 621 is tightly attached to the step surface, and the edge of the waterproof breathable membrane 63 is tightly attached to the inner side of the flange 621. A press ring 64 is fixed inside the joint 60, and the press ring 64 is pressed tightly against the inner side of the edge of the waterproof breathable membrane 63. In this way, the flexible check valve 62 and the waterproof breathable membrane 63 are fixed inside the joint 60; the joint 60 is fixed to the axle 10 by screwing, which has The exhaust hole 12 has an internal thread on its inner wall, and the joint 60 has an external thread on its outer circumferential surface. The joint 60 is screwed into the exhaust hole 12 through the internal thread and the external thread, so that the joint 60 and the axle 10 are kept fixed. An air guide pipe 61 is connected to the outer end of the joint 60, and a bending portion is provided on the air guide pipe 61. The bending portion is provided on the air guide pipe 61 so that the end of the air guide pipe 61 away from the joint 60 extends downward at an angle, so as to avoid water vapor from entering the cavity 11 through the air guide pipe 61 as much as possible, and prevent dust from entering through the air guide pipe 61.

[0029] In order to facilitate the processing of the hollow axle 10, an axial hole extending to the end of the axle 10 is provided inside the axle 10, and a plug cover 40 is installed from the end of the axle 10 to the inside of the axial hole. The end wall 41 is provided on the plug cover 40, and the periphery of the plug cover 40 is a side wall 42 connected to the edge of the end wall 41. The side wall 42 is tightly matched with the inner wall of the axial hole. The diaphragm 50 is fixedly connected to the inner side surface of the end wall 41 by a rivet 51, so that the diaphragm 50 can block the pressure relief hole 43.

[0030] The trailer axle of the utility model includes the pressure relief protection structure of the trailer axle mentioned above, and other structures of the trailer axle are the same as those in the prior art, which will not be described in detail here.

[0031] 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 pressure relief protection structure of the trailer axle is characterized by: Including axle, wheel hub, hub cover, inner bearing, outer bearing, oil seal; The wheel hub is pivotally connected to the axle through an inner bearing and an outer bearing. The inner bearing is located on the inner side of the outer bearing and is arranged at a certain distance from the outer bearing. The oil seal is located on the inner side of the inner bearing and is sealed between the inner edge surface of the wheel hub and the outer edge surface of the axle. The wheel hub cover is fixed to the outer end of the wheel hub and covers the outer side of the axle and the outer bearing. A cavity is formed inside the axle, and an exhaust hole is provided on the axle to connect the cavity with the external environment; an end wall is formed at the outer end of the cavity to isolate the cavity from the inner cavity of the wheel hub, and a pressure relief hole is provided on the end wall. A diaphragm for blocking the pressure relief hole is connected to the end wall on one side of the cavity, and the diaphragm is used to deform when the pressure in the inner cavity of the wheel hub is greater than the cavity pressure to open the pressure relief hole.

2. The pressure relief protection structure of the trailer axle according to claim 1, characterized in that: A one-way valve is installed at the exhaust hole, and the flow direction of the one-way valve is from the end of the exhaust hole connected with the cavity to the end of the exhaust hole connected with the external environment.

3. The pressure relief protection structure of the trailer axle according to claim 2, characterized in that: A joint is connected to the exhaust hole, and the one-way valve is a flexible check valve installed inside the joint, with an inlet of the flexible check valve facing the cavity and an outlet facing the outer end of the joint.

4. The pressure relief protection structure of the trailer axle according to claim 3, characterized in that: The inlet of the flexible check valve is sealed with a waterproof and breathable membrane.

5. The pressure relief protection structure of the trailer axle according to claim 4, characterized in that: A flange is arranged on the outer peripheral edge of the inlet of the flexible check valve, a step surface is arranged on the inner wall of the joint, the flange is tightly attached to the inner side of the step surface, the edge of the waterproof breathable membrane is tightly attached to the inner side of the flange, and a press ring is fixed inside the joint, which is pressed tightly to the inner side of the edge of the waterproof breathable membrane.

6. The pressure relief protection structure of the trailer axle according to claim 3, characterized in that: An internal thread is provided on the inner wall of the exhaust hole, and an external thread matching the internal thread is provided on the outer peripheral surface of the joint so that the joint can be screwed into the exhaust hole.

7. The pressure relief protection structure of the trailer axle according to claim 2, characterized in that: The outer end of the exhaust hole is connected with an air guide pipe, and a bending portion is arranged on the air guide pipe so that the end of the air guide pipe away from the joint extends downward.

8. The pressure relief protection structure of the trailer axle according to claim 1, characterized in that: The inside of the axle is provided with an axial hole extending to the end of the axle, a plugging cover is installed inside the axial hole, the end wall is arranged on the plugging cover, the periphery of the plugging cover is provided with a side wall which is tightly matched with the inner wall of the axial hole, and the diaphragm is fixedly connected to the inner side surface of the end wall.

9. A trailer axle, characterized in that: A pressure relief protection structure for a trailer axle comprising any one of claims 1-8.

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