Shaft cap for automatic inflation hub

Abstract

The utility model discloses a shaft cover for an automatic inflation hub. One side of a connecting plate is fixed with the bottom surface of a groove formed in a main body, and two annular grooves formed in the side are communicated with a step-shaped groove formed in the other side where a fixed seat is fixed through two channels II; a first straight hole formed in the center of each annular groove communicates with a second straight hole formed in the bottom face of one circular groove through a first channel. The hollow rotating shaft and the fixed seat form a rotating pair and are communicated with the step-shaped groove; two first stepped holes coaxial with the two annular grooves are formed in the bottom face of the groove, and valve element assemblies are arranged in the first stepped holes. Two second stepped holes are formed in the outer side wall of the body, one-way valves are arranged in column holes formed in the inner ends of the second stepped holes, connecting pipe fittings are arranged at the outer ends of the one-way valves, and the two column holes communicate with the two circular grooves. According to the utility model, the tire can be automatically inflated, so that the tire pressure of the tire is kept within a preset pressure range.

Description

Technical Field

[0001] The utility model belongs to the field of automobile parts, and in particular relates to a shaft cover for an automatic inflatable wheel hub. Background Art

[0002] Tires need to operate at a stable pressure. Insufficient or excessive tire pressure will cause abnormal wear of the tire, or even premature scrapping or tire blowout causing traffic accidents. At the same time, insufficient tire pressure will increase rolling resistance, thereby increasing fuel consumption and vehicle operating costs. Existing cars can only automatically detect tire pressure, but cannot automatically adjust the tire pressure within a reasonable range. When insufficient tire pressure is detected, the tire can only be inflated manually, which not only wastes labor costs, but also affects travel and transportation operations. In particular, most of the semi-trailers currently in use do not even have tire pressure monitoring equipment. Therefore, how to develop a device that can automatically inflate tires with insufficient tire pressure or leaking tires in real time during vehicle driving or stopping is an urgent problem to be solved. Summary of the invention

[0003] The utility model aims to overcome the shortcomings of the prior art and provides a shaft cover for an automatic inflatable wheel hub.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a shaft cover for an automatic inflatable wheel hub, which comprises a connecting plate, a fixing seat, a rotating shaft, a main body and a connecting pipe fitting.

[0006] The connecting plate is provided with a step-shaped groove on one side, and two annular grooves and two circular grooves arranged at intervals are provided on the other side, and the center line of the two annular grooves is perpendicular to the center line of the two circular grooves; the connecting plate is provided with a straight hole 1 perpendicular to the connecting plate at the center position of the two annular grooves, and the bottom surface of the two circular grooves is provided with a straight hole 2, each straight hole 1 is connected to a straight hole 2 through a channel 1 provided on the connecting plate; the fixing seat and the connecting plate are both located in the groove provided on the main body; the fixing seat can be detachably fixed on the step-shaped groove, and each annular groove is connected to a straight hole 2 through a channel provided on the connecting plate The second is connected with the gap between the fixed seat and the connecting plate in the step-shaped groove; the side of the connecting plate away from the fixed seat is detachably fixed to the bottom surface of the groove; two symmetrically arranged step holes 1 are opened on the bottom surface of the groove, and two coaxial step holes 2 are opened on the outer wall of the main body and symmetrically arranged about the central axis of the main body. The inner ends of the two step holes 2 are opened with coaxially arranged column holes, and the central axis of each step hole 1 is parallel to the central axis of the main body, and is perpendicular to the central axis of the step hole 2, and is respectively arranged in line with the central axis of the two annular grooves, and each column hole is connected with a circular groove through a channel opened on the main body. Among them, the gap between the fixed seat and the connecting plate in the step-shaped groove and each channel 2 and each annular groove constitute a cavity A, and each straight hole 1 and the corresponding channel 1, straight hole 2, circular groove, channel and column hole constitute a cavity B. The rotating shaft and the fixed seat constitute a revolving pair; the rotating shaft is hollow and connected with the A cavity.

[0007] Each step hole 1 is provided with a valve core assembly, and each step hole 2 is provided with a one-way valve. The valve core assembly includes a gasket, a valve spring, a spring seat, a diaphragm and a set screw; the outer edge of the diaphragm is fixed to the end of the step hole 1 close to the annular groove, the diaphragm separates the annular groove from the step hole 1, the spring seat is fixed to the side of the diaphragm away from the annular groove, and is connected to the gasket through the valve spring, the set screw is connected to the step hole 1 through a thread, and is tightly attached to the side of the gasket away from the spring seat, and the valve spring is compressed. The one-way valve includes a valve body and a valve core 1, the valve body is fixed to the step hole 2; the outer end of the valve core 1 coaxially arranged with the column hole is located in the through hole opened on the valve body, and is connected to the through hole through a compression spring, the inner end is located in the column hole, and an O-ring 1 is sleeved on the side wall of the valve core 1 close to the inner end face, and the O-ring 1 is tightly attached to the through hole.

[0008] The connecting pipe fittings include a valve core, a liner core 1, a pipe sleeve 1, an air pipe, a pipe sleeve 2, a liner core 2, a valve core 2 and a connecting nut; the pipe sleeve 1 and the pipe sleeve 2 are respectively fixedly sleeved on the two ends of the air pipe; the connecting nut is sleeved on the pipe sleeve 1 and forms a rotating pair with the pipe sleeve 1; the liner core 1 is coaxially fixed with the pipe sleeve, and the center hole 1 opened on the liner core 1 is connected with the air pipe, and the valve core is fixed at the end of the center hole 1 away from the air pipe; the liner core 2 is coaxially fixed with the pipe sleeve 2, and the liner core 2 is provided with a center hole 2 connected with the air pipe, and the end of the center hole 2 away from the air pipe is provided with a step hole 3; the valve core 2 is located at the end of the center hole 2 away from the air pipe, and is fixed in the step hole 3, and the center hole 2 is connected with the step hole 3 through the groove opened on the valve core 2.

[0009] Preferably, an observation cavity is provided at the end of the main body where no groove is provided, an observation window is provided at the outer end of the observation cavity, and a pressure ring is provided outside the observation window; the pressure ring is fixed to the main body by a plurality of countersunk screws evenly distributed along the circumference, and the outer edge of the observation window is pressed against the main body; an oil port is provided on the bottom surface of the groove of the main body near the outer edge of the connecting plate, and the groove is connected to the observation cavity through the oil port.

[0010] More preferably, an O-ring 2 is provided between the observation window and the boss, and a rubber ring is provided between the pressure ring and the main body.

[0011] Preferably, an O-ring three is provided between the main body and the connecting plate at a position within the circular groove.

[0012] Preferably, an O-ring four is provided between the fixing seat and the step-shaped groove.

[0013] Preferably, a flood seal is sleeved on one end of the rotating shaft close to the step-shaped groove.

[0014] Preferably, the rotating shaft is supported on the fixed seat through a bearing, and a shaft elastic retaining ring is provided on the rotating shaft, and the shaft elastic retaining ring limits the axial position of the rotating shaft.

[0015] Preferably, an O-ring five is embedded on one end of the rotating shaft away from the fixing seat.

[0016] Preferably, an O-ring six is ​​sleeved on the valve body.

[0017] Preferably, a plurality of O-rings 7 arranged at intervals are sleeved on the liner core 1.

[0018] The utility model has the following beneficial effects:

[0019] The utility model can realize automatic inflation of tires, so that the tire pressure is maintained within a preset pressure range, reducing tire wear and the possibility of tire blowout, extending the service life of the tire, improving safety, reducing the time for manual pressure inspection and filling, and reducing the cost of fleet maintenance, travel and transportation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view in the first cutting direction when the utility model does not include a connecting pipe fitting;

[0021] Figure 2 for Figure 1 A magnified view of part A;

[0022] Figure 3 It is a cross-sectional view in the second cutting direction when the utility model does not include the connecting pipe fittings;

[0023] Figure 4 for Figure 3 A magnified view of part B;

[0024] Figure 5 It is a cross-sectional view in the third cutting direction when the utility model does not include the connecting pipe fittings;

[0025] Figure 6 It is a partial cross-sectional view of the utility model when connecting a connecting pipe;

[0026] Figure 7 for Figure 6 Enlarged view of part C;

[0027] Figure 8 This is an inner end view of the utility model without connecting pipe fittings. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the utility model is a shaft cover for an automatic inflatable wheel hub, which includes a connecting plate 12, a fixing seat 14, a rotating shaft 16, a main body 25 and a connecting pipe.

[0030] A step-shaped groove is provided on one side of the connecting plate 12, and two annular grooves and two circular grooves arranged at intervals are provided on the other side, and the center line of the two annular grooves is perpendicular to the center line of the two circular grooves; a straight hole 1 perpendicular to the connecting plate 12 is provided at the center position of the two annular grooves on the connecting plate 12, and a straight hole 2 is provided on the bottom surface of the two circular grooves, and each straight hole 1 is connected to a straight hole 2 through a channel 1 provided on the connecting plate 12; the fixing seat 14 and the connecting plate 12 are both located in the groove provided on the main body; the fixing seat 14 is detachably fixed on the step-shaped groove, and each annular groove is connected to the gap between the fixing seat 14 and the connecting plate 12 in the step-shaped groove through a channel 2 provided on the connecting plate 12 (see Figure 3 ); the side of the connecting plate 12 away from the fixing seat 14 (i.e., the side with two annular grooves arranged at intervals and two circular grooves arranged at intervals) is detachably fixed to the bottom surface of the groove; two symmetrically arranged step holes 1 are provided on the bottom surface of the groove, and two coaxial and symmetrically arranged step holes 2 are provided on the outer wall of the main body 25, and the inner ends of the two step holes 2 are provided with coaxially arranged column holes, and the central axis of each step hole 1 is parallel to the central axis of the main body 25, and is perpendicular to the central axis of the step hole 2, and is respectively colinearly arranged with the central axes of the two annular grooves, and each column hole passes through a channel (see Figure 5 ) is connected to a circular groove. The gap between the fixed seat 14 and the connecting plate 12 in the stepped groove and each channel 2 and each annular groove constitute a cavity A, and each straight hole 1 and the corresponding channel 1, straight hole 2, circular groove, hole and column hole constitute a cavity B. The rotating shaft 16 and the fixed seat 14 form a revolving pair; the rotating shaft 16 is hollow and connected to the cavity A.

[0031] Each step hole 1 is provided with a valve core assembly, and each step hole 2 is provided with a one-way valve. The valve core assembly includes a gasket 6, a valve spring 7, a spring seat 8, a diaphragm 9 and a set screw 10; the outer edge of the diaphragm 9 is fixed to the end of the step hole 1 close to the annular groove, the diaphragm 9 separates the annular groove from the step hole 1, the spring seat 8 is fixed to the side of the diaphragm 9 away from the annular groove, and is connected to the gasket 6 through the valve spring 7, the set screw 10 is connected to the step hole 1 through a thread, and is tightly attached to the side of the gasket 6 away from the spring seat 8, and the valve spring 7 is compressed. The one-way valve includes a valve body 20 and a valve core 1 21, the valve body 20 is fixed to the step hole 2; the outer end of the valve core 1 21 coaxially arranged with the column hole is located in the through hole opened on the valve body 20, and is connected to the through hole through a compression spring, the inner end is located in the column hole, and the side wall of the valve core 1 21 close to the inner end face is sleeved with an O-ring 1 24, and the O-ring 1 24 is tightly attached to the through hole. In the initial state, each diaphragm 9 covers one end of each straight hole close to the diaphragm 9 under the action of the corresponding valve spring 7, and the A cavity is not connected with each B cavity.

[0032] The connecting pipe fittings include a valve core 29 , a liner core 1 31 , a pipe sleeve 1 32 , an air pipe 33 , a pipe sleeve 2 34 , a liner core 2 35 , a valve core 2 36 and a connecting pipe nut 38 . The pipe sleeve 1 32 and the pipe sleeve 2 34 are fixedly sleeved on the two ends of the air pipe 33 respectively; the connecting pipe nut 38 is sleeved on the pipe sleeve 1 32 and forms a rotating pair with the pipe sleeve 1 32; the liner core 1 31 is coaxially fixed with the pipe sleeve 1 32, and the center hole 1 opened on the liner core 1 31 is connected with the air pipe 33, and the valve core 29 is fixed at the end of the center hole 1 away from the air pipe 33; the liner core 2 35 is coaxially fixed with the pipe sleeve 2 34, and the liner core 2 35 is provided with a center hole 2 connected with the air pipe 33, and the end of the center hole 2 away from the air pipe 33 is provided with a step hole 3; the valve core 2 36 is located at the end of the center hole 2 away from the air pipe 33, and is fixed in the step hole 3, and the center hole 2 is connected with the step hole 3 through the groove opened on the valve core 2 36.

[0033] Before use, each step hole 2 is connected to a dustproof head to prevent the valve body 20 and the valve core 1 21 from being contaminated.

[0034] As a preferred embodiment, an observation cavity is provided at one end of the main body 25 where no groove is provided, an observation window 3 is provided at the outer end of the observation cavity, and a pressure ring 2 is provided outside the observation window 3; the pressure ring 2 and the main body 25 are fixed by a plurality of countersunk screws 5 evenly distributed along the circumference, and the outer edge of the observation window 3 is pressed against the main body 25; an oil port is provided on the bottom surface of the groove of the main body near the outer edge of the connecting plate 12, preferably four oil ports evenly distributed along the circumference; the groove is connected with the observation cavity through the oil port, and the oil added to the groove for lubricating the bearing on the vehicle wheel hub will flow into the observation cavity through the oil port, and the observation window 3 is made of transparent material, which is used to observe the amount of oil in the cavity and the groove. If the oil is insufficient, it should be refueled in time.

[0035] More preferably, an O-ring 24 is provided between the observation window 3 and the boss, and a rubber ring 1 is provided between the pressure ring 2 and the main body 25 . Both the rubber ring 1 and the O-ring 24 are used to ensure the sealing of the gap between the observation window 3 and the main body 25 .

[0036] As a preferred embodiment, an O-ring 3 11 is provided in the circular groove between the main body 25 and the connecting plate 12, and the O-ring 3 11 is used to ensure the sealing of the corresponding B cavity.

[0037] As a preferred embodiment, an O-ring 13 is provided between the fixing seat 14 and the step-shaped groove, and the O-ring 13 is used to ensure the sealing between the connecting plate 12 and the fixing seat 14.

[0038] As a preferred embodiment, a flood seal 15 is sleeved on one end of the rotating shaft 16 close to the step-shaped groove, and the flood seal 15 is used to ensure the sealing of the gap between the fixing seat 14 and the rotating shaft 16 .

[0039] As a preferred embodiment, the rotating shaft 16 is supported on the fixed seat 14 through a bearing 18 , and a shaft elastic circlip 17 is provided on the rotating shaft 16 , and the shaft elastic circlip 17 limits the axial position of the rotating shaft 16 .

[0040] As a preferred embodiment, an O-ring 5 19 is embedded on one end of the rotating shaft 16 away from the fixing seat 14. The O-ring 5 19 is used to ensure the sealing between the hose in the axle and the rotating shaft 16 when the rotating shaft 16 is connected to the hose in the axle.

[0041] As a preferred embodiment, one end of channel one is connected to the corresponding straight hole two, the middle part is connected to the corresponding straight hole one, and the other end is fixed with a seal 28, which is used to seal channel one after the processing of channel one is completed by drilling.

[0042] As a preferred embodiment, an O-ring 6 23 is sleeved on the valve body 20, and the O-ring 6 23 is used to ensure the sealing of the column hole.

[0043] As a preferred embodiment, Figure 8 As shown, the connecting plate 12 and the main body 25 are fixed by cylindrical head screws 26 .

[0044] As a preferred embodiment, the fixing seat 14 and the connecting plate 12 are fixed by pan head screws 27 .

[0045] As a preferred embodiment, a plurality of O-rings 7 30 arranged at intervals are sleeved on the liner core 1 31 , and the O-rings 7 30 are used to ensure the sealing between the valve body 20 and the liner core 1 31 .

[0046] As a preferred embodiment, a sealing gasket 37 is sleeved on the valve core 2 36 , and the sealing gasket 37 is used to ensure the sealing between the liner core 2 35 and the inflation port on the tire.

[0047] The working principle of the shaft cover for an automatic inflatable wheel hub of the utility model is as follows:

[0048] The utility model is installed at each end of the automobile axle, and the installation process is: remove the end cover at the outer end of the wheel hub, place the hose in the axle and the wheel hub, and fix and connect one end of the hose to the end of the rotating shaft 6 away from the step-shaped groove (preferably, a filter is arranged between the hose and the rotating shaft 6), and the other end is connected to the gas cylinder fixed on the chassis of the automobile through a pressure regulating valve, and then the main body 25 is installed on the wheel hub; if there are two tires at the end of the axle, the dustproof heads at the two step holes are removed, and each step hole is connected to the inflation hole on a wheel tire through a connecting pipe fitting; if there is only one tire at the end of the axle, only the dustproof head at the second of one of the step holes is removed, and the second step hole is connected to the inflation hole on the tire through a connecting pipe fitting.

[0049] Among them, the connection between the connecting pipe fitting and the step hole two is specifically as follows: the connecting nut 38 is connected to the step hole two by threads, and the end of the liner core 31 away from the air pipe 33 is embedded in the through hole, the valve shaft of the valve core 29 and the valve core 21 are pressed against each other, the compression spring is further compressed, and there is a gap between the O-ring 24 and the valve body 20, the column hole is connected with the through hole, and the valve core 29 is in an open state, and the through hole is connected with the air pipe 33 through the center hole 1 and the valve core 29.

[0050] The connection between the connecting pipe and the inflation hole on the tire is specifically as follows: the liner core 2 35 is connected to the inflation hole on the tire through threads, and the valve core 2 36 contacts the valve shaft of the valve core in the inflation hole, and pushes the valve shaft of the valve core in the inflation hole to move inward, so that the valve core in the inflation hole opens, and the internal space of the tire is connected to the air pipe 33 through the valve core in the inflation hole.

[0051] The gas pressure is set by the pressure regulating valve, and the gas cylinder is opened. At this time, the gas cylinder fills the rotating shaft 6 with compressed air through the pressure regulating valve, the hose and the filter. The compressed air enters the A cavity through the rotating shaft 6. When the compressed air pressure is greater than the force of the valve spring 7 (the opening pressure of the diaphragm 9), the compressed air overcomes the force of each valve spring 7, pushes each diaphragm 9 to arch upward, so that each straight hole 1 is opened, and then each B cavity is connected with the A cavity. The compressed air enters each B cavity, and then enters the air pipe 33 through the corresponding through hole, the center hole 1 and the valve core 29, and then enters the tire through the center hole 2, the notch, the step hole 3 and the valve core on the tire, and the tire is inflated until the tire pressure reaches the gas pressure set by the pressure regulating valve. Among them, the opening pressure of the diaphragm 9 can be changed by adjusting the locking screw 10. The tire pressure is determined by the gas pressure set by the pressure regulating valve and the opening pressure of the diaphragm 9. By changing the gas pressure set by the pressure regulating valve and the opening pressure of the diaphragm 9, the tire pressure can be adjusted to change within a preset pressure range, thereby reducing the friction between the tire and the ground and extending the service life of the tire. After the locking screw 10 is adjusted, it is generally no longer adjusted. Therefore, the tire pressure is ultimately determined by the gas pressure set by the pressure regulating valve. Of course, the gas pressure set by the pressure regulating valve needs to be greater than the opening pressure of the diaphragm 9, so that the tire can be continuously and automatically inflated so that the tire pressure always automatically reaches the preset pressure range.

[0052] In addition, the utility model can remove the observation window 3, add oil into the observation cavity and the groove to lubricate the bearing on the vehicle wheel hub, and then install the observation window 3 after adding the oil. The amount of oil in the observation cavity and the groove can be directly observed through the observation window 3.

[0053] The utility model is installed on the wheel hub of the vehicle. When the wheel hub rotates, the rotating shaft 16 does not rotate with the wheel hub, while the other parts rotate with the wheel hub. The rotating shaft 16 and the fixing seat 14 form a rotating pair, so there is no interference in the overall structure.

Claims

1. A shaft cover for an automatic inflatable wheel hub, comprising a main body and a connecting pipe, characterized in that: It also includes a connecting plate, a fixing seat and a rotating shaft; a step-shaped groove is provided on one side of the connecting plate, and two annular grooves and two circular grooves arranged at intervals are provided on the other side, and the center line of the two annular grooves is perpendicular to the center line of the two circular grooves; a straight hole 1 perpendicular to the connecting plate is provided at the center position of the two annular grooves on the connecting plate, and a straight hole 2 is provided on the bottom surface of the two circular grooves, and each straight hole 1 is connected with a straight hole 2 through a channel 1 provided on the connecting plate; the fixing seat and the connecting plate are both located in the groove provided on the main body; the fixing seat can be detachably fixed on the step-shaped groove, and each annular groove is connected with the gap between the fixing seat and the connecting plate in the step-shaped groove through a channel 2 provided on the connecting plate; the side of the connecting plate away from the fixing seat and the bottom surface of the groove can be Disassembly and fixation; two symmetrically arranged step holes 1 are provided on the bottom surface of the groove, two coaxial step holes 2 are provided on the outer side wall of the main body and symmetrically arranged about the central axis of the main body, and coaxially arranged column holes are provided at the inner ends of the two step holes 2, and the central axis of each step hole 1 is parallel to the central axis of the main body, and is perpendicular to the central axis of the step hole 2, and is respectively colinearly arranged with the central axes of the two annular grooves, and each column hole is connected to a circular groove through a channel provided on the main body; wherein, the gap between the fixed seat and the connecting plate in the step-shaped groove and each channel 2 and each annular groove constitute a cavity A, and each straight hole 1 and the corresponding channel 1, straight hole 2, circular groove, channel and column hole constitute a cavity B; the rotating shaft and the fixed seat constitute a rotating pair; the rotating shaft is hollow and connected to the A cavity; A valve core assembly is provided in each step hole 1, and a one-way valve is provided in each step hole 2; the valve core assembly includes a gasket, a valve spring, a spring seat, a diaphragm and a set screw; the outer edge of the diaphragm is fixed to the end of the step hole 1 close to the annular groove, the diaphragm separates the annular groove from the step hole 1, the spring seat is fixed to the side of the diaphragm away from the annular groove, and is connected to the gasket through the valve spring, the set screw is connected to the step hole 1 through a thread, and is tightly attached to the side of the gasket away from the spring seat, and the valve spring is compressed; the one-way valve includes a valve body and a valve core 1, the valve body is fixed to the step hole 2; the outer end of the valve core 1 coaxially arranged with the column hole is located in the through hole opened on the valve body, and is connected to the through hole through a compression spring, the inner end is located in the column hole, and an O-ring 1 is sleeved on the side wall of the valve core 1 close to the inner end face, and the O-ring 1 is tightly attached to the through hole; The connecting pipe fittings include a valve core, a liner core 1, a pipe sleeve 1, an air pipe, a pipe sleeve 2, a liner core 2, a valve core 2 and a connecting nut; the pipe sleeve 1 and the pipe sleeve 2 are respectively fixedly sleeved on the two ends of the air pipe; the connecting nut is sleeved on the pipe sleeve 1 and forms a rotating pair with the pipe sleeve 1; the liner core 1 is coaxially fixed with the pipe sleeve, and the center hole 1 opened on the liner core 1 is connected with the air pipe, and the valve core is fixed at the end of the center hole 1 away from the air pipe; the liner core 2 is coaxially fixed with the pipe sleeve 2, and the liner core 2 is provided with a center hole 2 connected with the air pipe, and the end of the center hole 2 away from the air pipe is provided with a step hole 3; the valve core 2 is located at the end of the center hole 2 away from the air pipe, and is fixed in the step hole 3, and the center hole 2 is connected with the step hole 3 through the groove opened on the valve core 2.

2. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: An observation cavity is provided at one end of the main body where no groove is provided, an observation window is provided at the outer end of the observation cavity, and a pressure ring is provided outside the observation window; the pressure ring is fixed to the main body by a plurality of countersunk screws evenly distributed along the circumference, and the outer edge of the observation window is pressed against the main body; an oil port is provided on the bottom surface of the groove of the main body near the outer edge of the connecting plate, and the groove is connected to the observation cavity through the oil port.

3. The shaft cover for an automatic inflatable wheel hub according to claim 2, characterized in that: An O-shaped sealing ring 2 is arranged between the observation window and the boss, and a rubber ring is arranged between the pressure ring and the main body.

4. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: An O-shaped sealing ring three is arranged between the main body and the connecting plate at a position in the circular groove.

5. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: An O-ring four is arranged between the fixing seat and the step-shaped groove.

6. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: An overflow seal is sleeved on one end of the rotating shaft close to the step-shaped groove.

7. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: The rotating shaft is supported on the fixed seat through a bearing, and a shaft elastic retaining ring is provided on the rotating shaft, and the shaft elastic retaining ring limits the axial position of the rotating shaft.

8. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: An O-shaped sealing ring 5 is embedded on one end of the rotating shaft away from the fixing seat.

9. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: An O-shaped sealing ring 6 is sleeved on the valve body.

10. The shaft cover for an automatic inflatable wheel hub according to claim 1, characterized in that: The liner core 1 is sleeved with a plurality of O-shaped sealing rings 7 arranged at intervals.

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