Automatic inflation tool for tire

Abstract

The utility model provides an automatic inflation tool for a tire. Comprising a hub bearing used for connecting a wheel tire and a brake disc, a transmission shaft bell-shaped shell arranged on the hub bearing and used for transmitting power torque, a static sealing assembly used for being connected with the wheel tire, a dynamic sealing assembly used for being connected with an air pump device and an air cavity structure providing a stable cavity. The hub bearing comprises a flange outer ring, a flange inner ring and a small inner ring installed on a shaft neck of the flange inner ring, the static sealing assembly comprises a locking bolt with a vent hole, the locking bolt is arranged in a center hole of the flange inner ring of the hub bearing in a penetrating mode, one end of the locking bolt is matched with the bell-shaped shell in a threaded connection mode, and the other end of the locking bolt is matched with the bell-shaped shell in a threaded connection mode. Clamping and separation of the hub bearing and the bell housing are achieved through the locking bolt, additional weight and other structures do not need to be added, cost can be effectively controlled, meanwhile, high efficiency of power transmission and stability of wheels are ensured, and important guarantee is provided for the overall performance and safety of a vehicle.

Description

Technical Field

[0001] The utility model relates to an automatic tire inflation tool. Background Art

[0002] When the tire pressure drops by 0.1 kg / cm below the standard pressure 2 , fuel consumption will increase by 2%; air pressure will drop by 0.2 kg / cm 2 , fuel consumption will increase by 4%--6%; air pressure drops by 0.4 kg / cm 2 , it will consume more than 10% more fuel.

[0003] Normal driving of a car (especially when encountering potholes or curbs on the road), penetration and seasonal changes in temperature will cause the tire to gradually deflate. Compared with properly inflated tires, under-inflated tires have reduced tire life, vehicle handling performance, and fuel economy. Especially when the tire pressure is insufficient, a car traveling at high speed is prone to tire blowouts and cause danger.

[0004] At present, many cars are equipped with tire pressure monitoring systems. The working principle is that when the tire pressure drops significantly, an alarm will be issued to the driver, prompting the driver to inflate the tire to restore the tire pressure to a normal level. However, this process requires the driver to inflate the tire, and the driver cannot inflate the tire without an external air source.

[0005] Therefore, during driving, the automatic tire inflation device plays a vital role in the safety, convenience and stability of automobile driving. However, there is currently a lack of a structure that can automatically inflate the tire without changing the wheel hub bearing and drive shaft structure, which can easily affect the safety and convenience during driving and affect the efficiency during driving. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides an automatic tire inflation tool.

[0007] To achieve the above-mentioned purpose, the utility model provides an automatic tire inflation tool, including a wheel hub bearing for connecting a wheel tire and a brake disc, a transmission shaft bell-shaped housing arranged on the wheel hub bearing for transmitting power torque, a static sealing assembly for connecting the wheel tire, a dynamic sealing assembly for connecting an air pump device, and an air cavity structure for providing a stable chamber; the wheel hub bearing includes a flange outer ring, a flange inner ring, and a small inner ring installed on the flange inner ring shaft neck, the static sealing assembly includes a locking bolt with a vent hole, the locking bolt is inserted into the center hole of the wheel hub bearing flange inner ring, one end of the locking bolt is threadedly matched with the bell-shaped housing, and the wheel hub bearing and the bell-shaped housing are clamped and separated by the locking bolt.

[0008] Furthermore, the dynamic sealing assembly includes a sealing shell arranged on the outer peripheral wall of the bell-shaped housing, a lug arranged on the sealing shell, the lug is provided with a mounting hole for connecting an external steering knuckle, the sealing shell is also provided with a through vent hole to provide an inflation and deflation channel, and a plurality of sealing lips are provided along the axial direction of the radially inward side of the sealing shell, at least one of which is in interference fit with the small inner ring rib of the wheel hub bearing, and at least one of which is in interference fit with the outer shell of the bell-shaped housing.

[0009] Furthermore, the air cavity structure includes a first chamber formed between the sealing shell and the small inner ring and the bell-shaped shell; a second chamber formed between the axial end of the flange inner ring and the axial end of the bell-shaped shell; and a third chamber formed between the locking bolt and the flange inner ring.

[0010] Furthermore, the vent hole is arranged at the nut of the locking bolt, the vent hole connects the third chamber with the outside, and the vent hole is equipped with a vent nozzle.

[0011] Furthermore, the sealing lip of the dynamic sealing assembly is an oil seal structure, and the oil seal structure includes an O-type spring nested in the sealing lip, and the sealing pressure between the O-type spring and the sealing lip is greater than 0.3Mpa.

[0012] Furthermore, one end of the locking bolt nut fits against the inner ring surface of the flange to form a seal.

[0013] Furthermore, a first tooth portion is provided at the inner ring end of the hub bearing flange located at the second chamber, and a second tooth portion is provided on the bell housing, and the first tooth portion is meshed with the second tooth portion.

[0014] The utility model has the following beneficial effects: by connecting the wheel hub bearing, the transmission shaft bell housing, the static sealing assembly, the dynamic sealing assembly and the air chamber structure, the wheel can be operated stably and efficiently transmitted, and the wheel can be rotated smoothly and supported by the load through the flange outer ring, the flange inner ring and the small inner ring of the wheel hub bearing; the static sealing assembly adopts a locking bolt with a vent hole, which passes through the center hole of the wheel hub bearing flange inner ring and is screwed with the bell housing to achieve a firm connection and convenient separation between the wheel hub bearing and the bell housing. This design not only ensures the sealing performance of the wheel hub bearing, but also facilitates maintenance and replacement; the dynamic sealing assembly can provide a dynamic seal of the wheel hub bearing by connecting an external air pump device, ensure stable air pressure, and help maintain the normal working state of the wheel hub bearing; the air chamber structure provides a stable chamber, further improves the performance and reliability of the wheel hub bearing, and adds a dynamic sealing module without changing the structure of the wheel hub bearing and the transmission shaft, without adding additional weight and other structures, which can effectively control the cost, and also ensures the high efficiency of power transmission and the stability of the wheel, providing an important guarantee for the overall performance and safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0016] Figure 2 This is a schematic structural diagram of a dynamic sealing assembly according to an embodiment of the utility model;

[0017] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at A. DETAILED DESCRIPTION

[0018] The following is a further description of the embodiment of the utility model in conjunction with the accompanying drawings: As shown in the figure, the tire automatic inflation tooling includes a wheel hub bearing 1 for connecting a wheel tire and a brake disc, a transmission shaft bell housing 2 arranged on the wheel hub bearing 1 for transmitting power torque, a static sealing assembly for connecting a wheel tire, a dynamic sealing assembly for connecting an air pump device, and an air cavity structure for providing a stable chamber; the wheel hub bearing 1 includes a flange outer ring 3, a flange inner ring 4, and a small inner ring 5 installed on the journal of the flange inner ring 4, the static sealing assembly includes a locking bolt 7 with a first vent 6, the locking bolt 7 is inserted into the center hole of the flange inner ring 4 of the wheel hub bearing 1, one end of the locking bolt 7 is screwed with the bell housing 2, and the wheel hub bearing 1 and the bell housing 2 are clamped and separated by the locking bolt 7. The air cavity structure constructed in this scheme can not only inflate and replenish the tire pressure when the tire pressure is reduced, but also release part of the gas through the air cavity when the tire pressure is too high, so as to keep the tire at the best working tire pressure and prevent tire blowout.

[0019] The dynamic seal assembly includes a seal housing 8 disposed on the outer peripheral wall of the bell housing 2, a lug 9 disposed on the seal housing 8, a mounting hole for connecting an external steering knuckle is disposed on the lug 9, and the seal housing 8 is also provided with a second vent hole 10 penetrating therethrough to provide an inflation and deflation channel, and a plurality of seal lips 11 are disposed along the axial direction of the radially inward side of the seal housing 8, at least one of which is interference-fitted with the rib of the small inner ring 5 of the hub bearing 1, and at least one of which is interference-fitted with the outer shell of the bell housing 2. The seal lip 11 is tightly connected with the interference-fitted parts to ensure the sealing effect, effectively prevent the leakage of lubricating oil and the intrusion of foreign impurities, and ensure the normal operation and long-term durability of the hub bearing 1 and the transmission system.

[0020] The air cavity structure includes a first cavity 12 formed between the sealing housing 8, the small inner ring 5 and the bell housing 2; a second cavity 13 formed between the axial end of the flange inner ring 4 and the axial end of the bell housing 2; and a third cavity 14 formed between the locking bolt 7 and the flange inner ring 4. The friction torque generated by the dynamic seal of the internal air cavity constructed in this solution is much smaller than that when the air cavity is constructed outside the bearing.

[0021] The first vent hole 6 is disposed at the nut of the locking bolt 7 . The first vent hole 6 connects the third chamber 14 with the outside. The first vent hole 6 is provided with a vent nozzle 15 .

[0022] The sealing lip 11 of the dynamic sealing assembly is an oil seal structure, which includes an O-type spring 15 nested in the sealing lip 11, and the sealing pressure between the O-type spring 15 and the sealing lip 11 is greater than 0.3Mpa. The dynamic sealing solution adopted in this solution is an oil seal structure, and after the sealing lip 11 is worn, the O-type spring 15 can continue to maintain the air cavity sealing performance.

[0023] One end of the nut of the locking bolt 7 is in contact with the surface of the flange inner ring 4 to form a seal. The locking bolt 7 torque is set to 90-230Nm, and the rotation angle is 60°.

[0024] The end of the inner ring 4 of the flange of the hub bearing 1 located at the second chamber 13 is provided with a first tooth portion 16, and the bell housing 2 is provided with a second tooth portion 17, and the first tooth portion 16 meshes with the second tooth portion 17. That is, the root portion of the end face tooth portion corresponds to the tooth top portion. The root and the tooth top portion of the end face tooth portion are both provided with fillets. When the locking bolt 7 is in the locked state, there is a certain tooth top clearance between the two end face teeth, and the tooth top clearance is set to 0.1~0.3 times the chamfer radius. This solution constructs an air cavity inside the bearing through the gap formed between the inner hole of the bearing and the end face teeth. Compared with constructing an air cavity outside, there is no need to add extra weight and other structures.

[0025] The above embodiment is only one of the preferred specific embodiments of the present invention. The common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A tire automatic inflation tool, characterized in that: It includes a wheel hub bearing for connecting a wheel tire and a brake disc, a transmission shaft bell housing arranged on the wheel hub bearing for transmitting power torque, a static sealing assembly for connecting the wheel tire, a dynamic sealing assembly for connecting an air pump device, and an air cavity structure for providing a stable chamber; the wheel hub bearing includes a flange outer ring, a flange inner ring, and a small inner ring installed on the flange inner ring shaft neck; the static sealing assembly includes a locking bolt with a vent hole, the locking bolt is inserted into the center hole of the wheel hub bearing flange inner ring, one end of the locking bolt is threadedly matched with the bell housing, and the wheel hub bearing and the bell housing are clamped and separated by the locking bolt.

2. The automatic tire inflation tool according to claim 1, characterized in that: The dynamic sealing assembly includes a sealing shell arranged on the outer peripheral wall of the bell housing, a lug arranged on the sealing shell, the lug is provided with a mounting hole for connecting an external steering knuckle, the sealing shell is also provided with a through vent hole to provide an inflation and deflation channel, and a radially inward side of the sealing shell is provided with a plurality of sealing lips along its axial direction, at least one of the sealing lips is interference fit with the small inner ring rib of the wheel hub bearing, and at least one of the sealing lips is interference fit with the outer shell of the bell housing.

3. The automatic tire inflation tool according to claim 2, characterized in that: The air cavity structure includes a first chamber formed between the sealing shell and the small inner ring and the bell-shaped shell; a second chamber formed between the axial end of the flange inner ring and the axial end of the bell-shaped shell; and a third chamber formed between the locking bolt and the flange inner ring.

4. The automatic tire inflation tool according to claim 3, characterized in that: The vent hole is arranged at the nut of the locking bolt, the vent hole connects the third chamber with the outside, and the vent hole is equipped with a vent nozzle.

5. The automatic tire inflation tool according to claim 4, characterized in that: The sealing lip of the dynamic sealing component is an oil seal structure, and the oil seal structure includes an O-type spring nested in the sealing lip, and the sealing pressure between the O-type spring and the sealing lip is greater than 0.3Mpa.

6. The automatic tire inflation tool according to claim 2, characterized in that: One end of the locking bolt nut is fitted with the inner ring surface of the flange to form a seal.

7. The automatic tire inflation tool according to claim 2, characterized in that: The inner ring end of the hub bearing flange located at the second chamber is provided with a first tooth portion, and the bell housing is provided with a second tooth portion, and the first tooth portion is meshed with the second tooth portion.

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