Automatic tire air supply device and method and vehicle

Abstract

The invention discloses an automatic tire air supply device and method and a vehicle, and belongs to the field of wheel accessories. According to the technical scheme, the automatic tire air supply device comprises a base part, and a plurality of piston assemblies and driving assemblies which are evenly arranged in the circumferential direction are arranged on the base part. The piston assembly comprises a cylinder body and a piston head; the cylinder body is provided with an air inlet and an air outlet; the driving assembly comprises a rotating block and an eccentric weight which can rotate, the axis of the rotating block and the axis of the eccentric weight coincide with the base part, the concave-convex face of the rotating block abuts against the piston head, a clutch mechanism is arranged between the rotating block and the eccentric weight, and when the tire pressure exceeds a set value, the clutch mechanism can be separated. The device is arranged in the center of a hub, the weight of components is balanced, and vibration is reduced; the eccentric heavy block is connected with the rotating block and does not rotate along with wheels when needing air supplement, and the influence of a traditional cam on dynamic balance is eliminated; the components are arranged around the axis of the base part, the structure is compact, wheels do not need to be greatly changed, the mass unevenness is reduced, the dynamic balance adjusting difficulty is lowered, the original performance is maintained, and the NVH problem is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wheel accessories, in particular to a tire automatic air supplement device, a tire automatic air supplement method, and a vehicle. BACKGROUND

[0002] Tire pressure is the guarantee of smooth driving of a vehicle, once the tire pressure is low, it will not only cause the increase of rolling resistance, and thus the increase of energy consumption and the decrease of endurance of the vehicle, but also may cause serious safety accidents such as tire burst due to uneven force on the tire structure. Although modern cars have gradually popularized tire pressure display and alarm functions, they can only play a reminding role, and still need the user to manually supplement air after parking.

[0003] In order to realize automatic air supplement during driving of the vehicle, there are two ways at present: One is to equip the vehicle with a centralized air supply device, and transmit high-pressure gas in the vehicle to the tire through a gas pipe and a rotating connection valve, so as to realize air supplement of the tire. Although the centralized air supply device can realize automatic air supply to a certain extent, the system is bulky and occupies a large amount of vehicle space, and needs to be arranged with a long gas pipe. At present, only a small part of off-road vehicles are equipped with the centralized air supply device.

[0004] The other is to configure a cam in a single wheel hub, and the cam continuously compresses a pump on the vehicle to inflate the tire when the cam rotates with the wheel hub. Although the structure greatly reduces the pipeline and the occupation of the vehicle space, the cam arranged on the wheel hub will make the overall weight of the wheel unevenly distributed, affect the dynamic balance of the wheel, and have an adverse effect on the dynamic balance of the wheel when the vehicle runs at high speed, thereby causing the problem of NVH (Noise, Vibration and Harshness) of the vehicle, and failing to meet the requirements of comfort and stability during normal driving of the vehicle. SUMMARY

[0005] The present application provides a tire automatic air supplement device, a tire automatic air supplement method, and a vehicle, which can solve the problem that the current wheel end automatic air supplement device affects the dynamic balance of the wheel.

[0006] To solve the above problems, the technical scheme adopted by the first aspect of the present application is a kind of automatic tire inflator, comprising a base part, the base part is used to connect wheel and can follow the coaxial rotation of wheel hub, a plurality of piston assemblies and drive assemblies are installed on the base part, the drive assembly can drive the piston assembly to compress: a plurality of the piston assemblies are evenly arranged in the circumferential direction of the base part, the piston assembly includes cylinder body and piston head, the piston head of a plurality of the piston assemblies is towards left side, the first compression spring is arranged in the cylinder body, the first compression spring can push the piston head to left side, the cylinder body has piston inlet and piston outlet, the piston outlet of a plurality of the cylinder body is connected to the tire of wheel;The drive assembly is arranged at the left side of piston head, the drive assembly includes rotating block and eccentric weight, the rotating block and the eccentric weight are rotatably arranged on the base part, the rotating axis of the rotating block and the eccentric weight coincides with the rotating axis of the base part, the right side surface of the rotating block is concave-convex surface, the concave-convex surface is in contact with a plurality of piston heads, the clutch mechanism is arranged between the rotating block and the eccentric weight, when the tire pressure is higher than the set value, the clutch mechanism is separated.In this scheme, the inflator is arranged at the center axis of the wheel hub, a plurality of piston assemblies are evenly arranged in the circumferential direction of the base part, so that the weight of each component is balanced in the circumferential direction of the wheel, reducing the vibration when the wheel rotates;The eccentric weight is rotatably connected with the base part, and remains in a drooping state, when the inflator is needed, the rotating block is connected with the eccentric weight through the clutch mechanism, and always does not rotate with the wheel, eliminating the influence of the traditional cam structure on the dynamic balance of the wheel;The components of the device are arranged around the rotating axis of the base part, the overall structure is compact and concentrated on the related parts of the wheel, without the need to make substantial changes to the wheel, reducing the uneven distribution of mass caused by the installation of additional components, reducing the difficulty of adjusting the dynamic balance of the wheel, helping to maintain the original dynamic balance performance of the wheel and reducing the occurrence of NVH problems.

[0007] As a preferred implementation scheme of the automatic tire inflator, the base part is further provided with a gas storage chamber, a plurality of the piston outlets are in communication with the gas storage chamber, a first one-way valve is arranged in the piston outlet, the first one-way valve is open in the direction from the cylinder body to the gas storage chamber, the gas storage chamber is provided with a charging port for connecting the inflator port of the tire. The gas storage chamber serves as an intermediate chamber between the piston and the tire, ensuring the continuity and stability of the inflation process;The first one-way valve ensures one-way flow of gas, improving the inflation efficiency;The tire is connected through the charging port, simplifying the pipeline layout, reducing the problem of uneven mass distribution caused by messy pipeline, and further maintaining the dynamic balance of the wheel.

[0008] As a preferred implementation scheme of the tire automatic air supplement device, the gas storage chamber is annular, and a plurality of the piston assemblies are arranged in the ring of the gas storage chamber. The annular structure is coaxial with the rotation center of the wheel, conforms to the circular symmetry characteristics of the wheel, uniformly distributes the mass of the gas storage chamber itself, and avoids destroying the dynamic balance of the wheel due to eccentric structure; the piston assembly is built-in in the ring, the overall structure is more compact, the space utilization rate is high, and the interference on other parts in the wheel is reduced.

[0009] As a preferred implementation scheme of the tire automatic air supplement device, the right side surface of the rotating block is provided with first end face teeth, the left side surface of the eccentric weight is provided with second end face teeth, the first end face teeth and the second end face teeth abut and mesh, the clutch mechanism includes a push plate, the push plate is located on the right side in the gas storage chamber, the shape of the push plate is matched with the cross-sectional shape of the gas storage chamber; the outer part of the base part is provided with a push rod, the right side surface of the gas storage chamber is provided with an opening, one end of the push rod is in abutment with the right side surface of the push plate at the opening, and the other end of the push rod is provided with a rotating sleeve, a center rod is rotatably installed in the rotating sleeve, and the center rod is fixedly connected with the rotating block. The end face tooth meshing structure stably transmits power, the clutch action is accurate, the device can be reliably driven when the air pressure is insufficient, the device is timely separated when the air pressure meets the standard, the interference of the eccentric weight on the rotation of the wheel is reduced, the push plate is matched with the cross section of the gas storage chamber, the air tightness is ensured, the push plate can move with the change of the air pressure, and then the push rod is pushed to move, the push rod and the center rod are connected through the rotating sleeve, the center rod and the rotating block can smoothly rotate while moving in the axial direction, and the components are symmetrically distributed along the central axis, and the dynamic balance of the wheel is further ensured.

[0010] As a preferred implementation scheme of the tire automatic air supplement device, the base part is provided with an accommodating cavity along the position of the rotation axis of the base part, the center rod is arranged in the accommodating cavity, a second compression spring is sleeved on the center rod, an axial shoulder is arranged on the center rod and located close to the rotating block, one end of the second compression spring is in abutment with the axial shoulder, and the other end of the second compression spring is in abutment with the inner wall on the right side of the accommodating cavity. The second compression spring provides a reset force, ensures that the clutch mechanism is quickly engaged when the air pressure is insufficient, and improves the response speed of the device; the center rod is arranged along the rotation axis of the base part, the stress directions of the compression spring and the axial shoulder are consistent with the axis, radial eccentric force is avoided, and the additional influence on the dynamic balance of the wheel is reduced; the accommodating cavity restricts the center rod and the compression spring, prevents the mass from deviating due to the shaking of the components, and maintains the stability of the structure.

[0011] As a preferred embodiment of an automatic tire inflation device, multiple push rods are provided, evenly distributed circumferentially along the base, and the projection of each push rod onto the side end face of the base is radially arranged along the base. The circumferential arrangement of multiple push rods, in conjunction with the annular structure of the push plate, facilitates smoother clutch disengagement, preventing component tilting or offset due to unilateral force, and further ensuring wheel dynamic balance.

[0012] As a preferred embodiment of an automatic tire inflation device, the rotating block is wedge-shaped, and a balancing cavity is provided inside the rotating block to ensure that the center of gravity of the rotating block is located on its own rotation axis. Having the center of gravity on the rotation axis ensures that no eccentric centrifugal force is generated when the rotating block rotates with the base, completely eliminating interference with the wheel's dynamic balance caused by the rotating block's own center of gravity shift. The wedge-shaped structure combined with the balancing cavity ensures the function of the drive piston assembly while also taking into account dynamic balance performance, thus improving the stability of the device's operation.

[0013] As a preferred embodiment of an automatic tire inflation device, the rotating block is disc-shaped, and its right side is uniformly provided with continuous wavy protrusions along the circumference. The disc-shaped structure is coaxial with the wheel, and the uniformly circumferentially wavy protrusions ensure that each piston head is subjected to balanced force; the continuous wavy design reduces the impact between the piston head and the rotating block, reduces motion noise, and the symmetrical structural layout further consolidates the wheel dynamic balance and improves vehicle driving comfort.

[0014] Secondly, the present invention provides an automatic tire inflation method, comprising the following steps: When the tire pressure is insufficient, the first end face teeth and the second end face teeth mesh, the rotating block and the eccentric weight block are relatively fixed, the eccentric weight block and the rotating block are stationary relative to the vehicle body, multiple piston assemblies and the base rotate with the wheel hub, the concave and convex surfaces of the rotating block push multiple piston heads in sequence, the piston assemblies inflate the air storage chamber, and the air storage chamber inflates the tire. When the tire pressure reaches the set value, the air pressure in the air chamber rises accordingly, pushing the push plate to move to the right side of the air chamber. The push plate pushes the push rod and the center rod, and the center rod pulls the rotating block, causing the first end face tooth and the second end face tooth to disengage. The rotating block rotates with the base.

[0015] It automatically responds to tire pressure status without external control, achieving adaptive inflation under all working conditions; when the pressure reaches the target, the clutch disengages, and the rotating block moves synchronously with the base, eliminating the additional centrifugal force caused by speed difference and ensuring dynamic balance stability when the wheel rotates at high speed; the inflation and shutdown process is smoothly switched, reducing mechanical impact and minimizing vibration impact on the wheel structure.

[0016] Thirdly, the present invention also provides a vehicle, including a wheel hub, on which an automatic tire inflation device as described above is provided. The device is integrated into the wheel hub, without altering the vehicle's appearance or overall structural layout; through optimized dynamic balance design, it ensures that the device does not affect the vehicle's driving stability during operation, reducing the probability of NVH problems; it achieves automatic tire pressure maintenance, reducing increased rolling resistance and safety hazards caused by low tire pressure, and improving the vehicle's range and driving safety.

[0017] As can be seen from the above technical solutions, the beneficial effects of the present invention are as follows: The device is arranged around the central axis of the wheel hub, and multiple piston assemblies are evenly distributed circumferentially in the base. Combined with the annular air storage chamber and the built-in piston assemblies, the weight of each component is evenly distributed, avoiding structural eccentricity that could disrupt the wheel's dynamic balance and reducing rotational vibration. In the drive assembly, the eccentric weight is rotatably connected to the base. When air replenishment is needed, it engages with the rotating block via a clutch mechanism and does not rotate with the wheel. When the air pressure reaches the target, the clutch disengages, eliminating the influence of the traditional cam structure on the dynamic balance. The rotating block adopts a wedge-shaped or disc-shaped design, and through a balancing cavity or circumferentially uniform wave-shaped protrusions, it ensures that the center of gravity is located on the rotation axis, further avoiding interference from eccentric centrifugal force. Functionally, the air storage chamber, in conjunction with the first one-way valve, ensures air replenishment. Continuous, stable, and efficient, the centralized air inlet simplifies the pipeline layout and reduces uneven mass distribution. The clutch mechanism transmits power through end-face tooth meshing, and the symmetrical design of the push plate, push rod, and center rod achieves precise clutch engagement. The second compression spring ensures rapid response to air pressure changes, and multiple circumferentially evenly arranged push rods prevent unilateral force from causing component displacement, ensuring structural stability. The automatic tire inflation method adapts to tire pressure conditions without external control, and the inflation and de-inflation processes are smoothly switched, reducing mechanical shock and vibration. When applied to vehicles, the device is integrated into the wheel hub without altering the vehicle structure. The optimized dynamic balance design reduces the probability of NVH problems, achieves automatic tire pressure maintenance, reduces increased rolling resistance and safety hazards caused by low tire pressure, and improves vehicle range and driving safety. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Fig. 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0020] Fig. 2 This is a schematic diagram of the axial section of the automatic tire inflation device in a specific embodiment of the present invention.

[0021] Fig. 3This is an exploded view of a specific embodiment of the present invention.

[0022] Explanation of main figure symbols 1. Base section, 2. Piston assembly, 2-1 Cylinder block, 2-2. Piston head, 3. Rotating block, 3-1. Concave-convex surface, 4. Eccentric weight, 5. First compression spring, 6. Piston inlet, 7. Piston outlet, 8. Air storage chamber, 9. First one-way valve, 10. Second one-way valve, 11. Air inlet, 12. First end face tooth, 13. Second end face tooth, 14. Push plate, 15. Push rod, 16. Center rod, 16-1. Shoulder, 17. Rotating sleeve, 18. Receiving cavity, 19. Second compression spring, 20. Hub, 21. Air supply pipe, 22. Valve. Detailed Implementation

[0023] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] Example 1 like Figs. 1-3 As shown, an automatic tire inflation device includes a base 1 for connecting a wheel and rotating coaxially with the wheel hub. Multiple piston assemblies 2 and a drive assembly are mounted on the base 1. The drive assembly compresses the piston assemblies 2. The multiple piston assemblies 2 are evenly arranged circumferentially on the base 1 to balance the weight of each component around the wheel, reducing vibration during wheel rotation. Each piston assembly 2 includes a cylinder 2-1 and a piston head 2-2. The piston heads 2-2 of the multiple piston assemblies 2 all face the left side of the automatic inflation device (in this specific embodiment, to be on the left side). Fig. 3The axial cross-section shown indicates left and right (in actual vehicle installation, the right side faces inward towards the wheel, and the left side faces outward towards the wheel). The cylinder 2-1 is equipped with a first compression spring 5, which pushes the piston head 2-2 to the left. The cylinder 2-1 has a piston inlet 6 and a piston outlet 7. The piston inlet 6 is equipped with a second one-way valve 10. Multiple piston outlets 7 of the cylinder 2-1 are connected to the tires of the wheels. The base 1 also has an air storage chamber 8, which is annular. Multiple piston assemblies 2 are disposed within the annulus of the air storage chamber 8. The annular structure is coaxial with the wheel's rotation center, conforming to the circular symmetry of the wheel, ensuring uniform mass distribution within the air storage chamber and preventing damage due to structural eccentricity. The wheel is dynamically balanced, and the piston assembly is built into the ring, resulting in a more compact overall structure, high space utilization, and reduced interference with other internal components of the wheel. Multiple piston outlets 7 are connected to the air storage chamber 8. Each piston outlet 7 is equipped with a first one-way valve 9, which guides the flow from the cylinder 2-1 to the air storage chamber 8. The air storage chamber 8 is equipped with an air inlet 11, which connects to the tire's inflation port. The air storage chamber can temporarily store compressed gas, ensuring the continuity and stability of the inflation process. The first one-way valve ensures unidirectional gas flow, reducing energy loss and improving inflation efficiency. Centralized connection to the tire via the air inlet simplifies the pipeline layout, reduces uneven mass distribution caused by messy pipelines, and further maintains wheel dynamic balance.

[0025] The drive assembly is located on the left side of the piston head 2-2. The drive assembly includes a rotating block 3 and an eccentric weight 4. Both the rotating block 3 and the eccentric weight 4 are rotatably mounted on the base 1. The rotation axes of both the rotating block 3 and the eccentric weight 4 coincide with the rotation axis of the base 1. The eccentric weight is rotatably connected to the base and remains in a drooping state. When air replenishment is needed, it connects to the rotating block via a clutch mechanism and does not rotate with the wheel, eliminating the influence of traditional cam structures on wheel dynamic balance. The right side of the rotating block 3 is a concave-convex surface 3-1. The rotating block 3 is wedge-shaped and has a balancing cavity inside to keep the center of gravity on its own rotation axis. Alternatively, it can be disc-shaped with continuous wavy protrusions evenly arranged on its right side. The wedge-shaped structure combined with the balancing cavity or the disc shape combined with the wavy protrusions can ensure the function of the driving piston assembly while avoiding eccentric centrifugal force caused by the center of gravity shift, thus taking into account dynamic balance performance and improving the stability of the device operation. A clutch mechanism is provided between the rotating block 3 and the eccentric weight 4. When the tire pressure is higher than the set value, the clutch mechanism disengages.

[0026] The rotating block 3 has a first end face tooth 12 on its right side, and the eccentric weight 4 has a second end face tooth 13 on its left side. The first end face tooth 12 and the second end face tooth 13 are close together and mesh. The clutch mechanism includes a push plate 14, which is located on the right side inside the gas storage chamber 8. The shape of the push plate 14 is adapted to the cross-sectional shape of the gas storage chamber 8 to ensure airtightness and allow it to move with changes in air pressure. The base part 1 has multiple push rods 15 on its exterior. The multiple push rods 15 are arranged along the base part 1. The components of part 1 are evenly distributed circumferentially, and their projections on the side end faces of the base part 1 are arranged radially along the base part 1 to avoid tilting or offset of components caused by unilateral force, further ensuring the dynamic balance of the wheels; the right side face of the air storage chamber 8 is provided with multiple corresponding openings, one end of the push rod 15 abuts against the right side face of the push plate 14 at the opening, and the other end of the push rod 15 is provided with a rotating sleeve 17, in which a central rod 16 is rotatably mounted, and the central rod 16 is fixedly connected to the rotating block 3. The rod and the center rod are connected by a rotating sleeve, ensuring that the center rod and the rotating block can rotate smoothly while moving axially. Furthermore, all components are symmetrically distributed along the central axis, further ensuring the dynamic balance of the wheel. Specifically, a receiving cavity 18 is provided in the base part 1 along its own rotation axis. The center rod 16 passes through the receiving cavity 18, and a second compression spring 19 is sleeved on the center rod 16. A shoulder 16-1 is provided on the center rod 16 near the rotating block 3. One end of the second compression spring 19 abuts against the shoulder 16-1, and the other end abuts against the inner wall of the right side of the receiving cavity 18. The second compression spring provides reset power, ensuring that the clutch mechanism engages quickly when the air pressure is insufficient, improving the device's response speed. Since the center rod is set along the rotation axis of the base part, the force direction of the compression spring and the shoulder is consistent with the axis, avoiding radial eccentric force and reducing additional impact on the wheel's dynamic balance. The receiving cavity constrains the center rod and the compression spring, preventing mass shift caused by component swaying and maintaining structural stability.

[0027] Example 2 Based on the automatic tire inflation device provided in Embodiment 1, this embodiment provides an automatic tire inflation method, including the following steps: When the tire pressure is insufficient, the first end face tooth 12 and the second end face tooth 13 mesh, the rotating block 3 and the eccentric weight 4 are fixed relative to each other, the eccentric weight 4 and the rotating block 3 are stationary relative to the vehicle body, the multiple piston assemblies 2 and the base part 1 rotate with the wheel hub, the concave and convex surfaces 3-1 of the rotating block 3 push the multiple piston heads 2-2 in sequence, the piston assemblies inflate the air storage chamber 5, and the air storage chamber 5 inflates the tire; when the tire pressure reaches the set value, the air pressure in the air storage chamber 5 rises accordingly, pushing the push plate 14 to move to the right side of the air storage chamber 5, the push plate 14 pushes the push rod 15 and the center rod 16, the center rod 16 pulls the rotating block 3, causing the first end face tooth 12 and the second end face tooth 13 to disengage, and the rotating block 3 rotates with the base part 1. This method can automatically respond to tire pressure status without external control, achieve adaptive inflation under all working conditions, disengage the clutch when the pressure is up to standard, and move the rotating block and the base synchronously to eliminate the extra centrifugal force caused by the speed difference, ensuring the dynamic balance stability of the wheel when it rotates at high speed. The inflation and stopping process is smooth, reducing mechanical impact and minimizing the vibration impact on the wheel structure.

[0028] Example 3 Based on the automatic tire inflation device of Embodiment 1, this embodiment further provides a vehicle including a wheel hub 20, on which the automatic tire inflation device of Embodiment 1 is provided, and the inflation port 11 is connected to the valve 22 on the wheel hub 20 through an air supply pipe 21.

[0029] This embodiment integrates the automatic tire inflation device into the wheel hub without changing the vehicle's appearance or overall structural layout. Through optimized dynamic balance design, it ensures that the device does not affect the vehicle's driving stability during operation, reduces the probability of NVH problems, and can automatically maintain tire pressure, reducing the increase in rolling resistance and safety hazards caused by low tire pressure, thereby improving the vehicle's range and driving safety.

[0030] As can be seen from the above embodiments, the advantages of the present invention are as follows: The device is arranged around the central axis of the wheel hub, and multiple piston assemblies are evenly distributed circumferentially in the base. Combined with the annular air storage chamber and the built-in piston assemblies, the weight of each component is evenly distributed, avoiding the disruption of wheel dynamic balance due to structural eccentricity and reducing rotational vibration. In the drive assembly, the eccentric weight is rotatably connected to the base. When air replenishment is needed, it engages with the rotating block through a clutch mechanism and does not rotate with the wheel. When the air pressure reaches the standard, the clutch disengages, eliminating the influence of the traditional cam structure on dynamic balance. The rotating block adopts a wedge-shaped or disc-shaped design, and the center of gravity is ensured to be on the rotation axis through a balance cavity or circumferentially uniform wave-shaped protrusions, further avoiding interference from eccentric centrifugal force. Functionally, the air storage chamber cooperates with the first one-way valve to ensure continuous air replenishment. Stable and efficient, the centralized air inlet simplifies the pipeline layout and reduces uneven mass distribution. The clutch mechanism transmits power through end-face tooth meshing, and the symmetrical design of the push plate, push rod, and center rod achieves precise clutch engagement. The second compression spring ensures rapid response to air pressure changes, and multiple circumferentially evenly arranged push rods prevent unilateral force from causing component displacement, ensuring structural stability. The automatic tire inflation method adapts to tire pressure conditions without external control, and the inflation and de-inflation processes are smoothly switched, reducing mechanical shock and vibration. When applied to vehicles, the device is integrated into the wheel hub without altering the vehicle structure. The optimized dynamic balance design reduces the probability of NVH problems, achieves automatic tire pressure maintenance, reduces increased rolling resistance and safety hazards caused by low tire pressure, and improves vehicle range and driving safety.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tire automatic air refilling device characterized by, The application relates to a wheel driving device, which comprises a base part (1) for connecting a wheel and capable of following the coaxial rotation of a wheel hub, a plurality of piston assemblies (2) and a driving assembly being arranged on the base part (1), and the driving assembly being capable of driving the piston assemblies (2) to compress: The piston assemblies (2) are evenly arranged in the circumferential direction of the base part (1), the piston assembly (2) comprises a cylinder body (2-1) and a piston head (2-2), the piston heads (2-2) of the piston assemblies (2) are all directed to the left side, a first compression spring (5) is arranged in the cylinder body (2-1), the first compression spring (5) is capable of pushing the piston head (2-2) to the left side, the cylinder body (2-1) is provided with a piston air inlet (6) and a piston air outlet (7), the piston air outlets (7) of the cylinder bodies (2-1) are connected to the tire of the wheel; The driving assembly is arranged on the left side of the piston head (2-2), the driving assembly comprises a rotating block (3) and an eccentric weight (4), the rotating block (3) and the eccentric weight (4) are both rotatably arranged on the base part (1), the rotating axes of the rotating block (3) and the eccentric weight (4) are all coincident with the rotating axis of the base part (1), the right side surface of the rotating block (3) is a concave-convex surface (3-1), the concave-convex surface (3-1) is in contact with the piston heads (2-2), a clutch mechanism is arranged between the rotating block (3) and the eccentric weight (4), and the clutch mechanism is separated when the tire air pressure is higher than a set value.

2. The automatic tire inflator of claim 1, wherein The base part (1) is further provided with a gas storage chamber (8), the piston air outlets (7) are in communication with the gas storage chamber (8), a first one-way valve (9) is arranged in the piston air outlet (7), the first one-way valve (9) is in communication in the direction from the cylinder body (2-1) to the gas storage chamber (8), and the gas storage chamber (8) is provided with a gas inlet (11) for connecting the air supplementing port of the tire of the vehicle.

3. The automatic tire inflator of claim 2, wherein The gas storage chamber (8) is annular, and the piston assemblies (2) are arranged in the ring of the gas storage chamber (8).

4. The automatic tire inflator of claim 2, wherein The right side surface of the rotating block (3) is provided with a first end surface tooth (12), the left side surface of the eccentric weight (4) is provided with a second end surface tooth (13), the first end surface tooth (12) and the second end surface tooth (13) are in contact and meshing, the clutch mechanism comprises a push plate (14), the push plate (14) is located on the right side in the interior of the gas storage chamber (8), the shape of the push plate (14) is matched with the cross-sectional shape of the gas storage chamber (8); the outer part of the base part (1) is provided with a push rod (15), the right side surface of the gas storage chamber (8) is provided with an opening, one end of the push rod (15) is in contact with the first side surface of the push plate (14) at the opening, the other end of the push rod (15) is provided with a rotating sleeve (17), a center rod (16) is rotatably arranged in the rotating sleeve (17), and the center rod (16) is fixedly connected with the rotating block (3).

5. The automatic tire inflator of claim 4, wherein The base part (1) is provided with a containing cavity (18) along the position of the rotation axis, the center rod (16) is arranged in the containing cavity (18), the second compression spring (19) is arranged on the center rod (16), the shaft shoulder (16-1) is arranged on the center rod (16) near the rotating block (3), one end of the second compression spring (19) is in abutment with the shaft shoulder (16-1), and the other end of the second compression spring (19) is in abutment with the inner wall of the right side of the containing cavity (18).

6. The automatic tire inflator of claim 4, wherein The plurality of push rods (15) are arranged uniformly along the circumference of the base part (1), and the projection of the push rod (15) in the side end surface of the base part (1) is arranged along the radial direction of the base part (1).

7. The automatic tire inflator of claim 1, wherein The rotating block (3) is wedge-shaped, and the balance cavity is arranged in the rotating block (3) so that the center of gravity of the rotating block (3) is located on the rotation axis.

8. The automatic tire inflator of claim 1, wherein, The rotating block (3) is disc-shaped, and the right side surface of the rotating block (3) is uniformly provided with continuous wave-shaped protrusions in the circumferential direction.

9. A method of automatically inflating a tire, characterized by, The method comprises the following steps: When the tire pressure is insufficient, the first end surface tooth (12) and the second end surface tooth (13) are engaged, the rotating block (3) is fixed relative to the eccentric weight (4), the eccentric weight (4) is stationary relative to the rotating block (3), the plurality of piston assemblies (2) rotate with the base part (1) and the hub, the concave-convex surface (3-1) of the rotating block (3) sequentially pushes the plurality of piston heads (2-2), the piston assembly inflates the air chamber (8), and the air chamber (8) inflates the tire; When the tire pressure reaches the set value, the air pressure in the air chamber (8) rises, the push plate (14) moves to the right side of the air chamber (8), the push plate (14) pushes the push rod (15) and the center rod (16), the center rod (16) pulls the rotating block (3), the first end surface tooth (12) and the second end surface tooth (13) are disengaged, and the rotating block (3) rotates with the base part (1).

10. A vehicle comprising a wheel hub (20), characterized in that The hub (20) is provided with the automatic tire inflator device according to any one of claims 1-8.

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