Tire air filling device

Abstract

A tire air filling device (1) of one embodiment includes a cylinder (11) having a first opening (11r) communicating with a tire, and a weight (12) provided inside the cylinder (11), having an air flow hole (12b) through which air is supplied to the tire, and moving in the axial direction of the cylinder (11) by centrifugal force to supply air to the tire from the first opening (11r). The tire air filling device (1) includes a weight spring (16) interposed between the weight (12) and an inner surface (11b) of the cylinder (11), and an inclination member (15) installed to the one-way valve (20) and the cylinder (11) in a state in which the cylinder (11) is inclined with respect to the one-way valve (20) that prevents backflow of air from the tire to the inside of the cylinder (11).

Description

Technical Field

[0001] This disclosure relates to a tire air filling device for filling the inside of a tire with air.

[0002] This application claims priority based on Japanese Application No. 2021-148565, dated September 13, 2021, and incorporates all the contents of that Japanese application. Background Technology

[0003] Tire air filling devices that fill the inside of tires in automobiles and other vehicles are known to exist. Japanese Patent Application Publication No. 2008-308081 describes an air pressure adjusting device installed on the spokes of a wheel. A portion of the air pressure adjusting device protrudes from the outer periphery of the wheel rim towards the inner space of the tire. The air pressure adjusting device includes: a cylinder screwed into the spoke; and a piston configured to reciprocate within the cylinder.

[0004] A first umbrella-shaped valve is installed at the end of the cylinder near the tire side, which opens and closes the airflow path within the cylinder. This first umbrella-shaped valve functions as a check valve to prevent backflow of air from the tire's internal space into the cylinder. The first umbrella-shaped valve opens its flow path when the air pressure inside the cylinder is greater than the air pressure inside the tire's internal space, allowing air to flow from the cylinder's internal space to the tire's internal space. The first umbrella-shaped valve prevents this airflow when the air pressure inside the cylinder is less than the air pressure inside the tire's internal space.

[0005] The piston divides the internal space of the cylinder into a first chamber and a second chamber, with the second chamber communicating with the internal space of the tire. A recess is formed at the end of the piston exposed to the first chamber, and a partition wall is provided in this recess. This partition wall divides the interior of the piston into a third chamber, separate from the first chamber. A second umbrella-shaped valve is installed on this partition wall, which opens and closes a through-hole of the piston serving as an airflow path from the first chamber to the third chamber. A helical spring is positioned between the piston and the bottom surface of the cylinder's internal space, applying force to the piston towards the first chamber.

[0006] In this air pressure regulating device, if the wheel rotation speed increases as the car moves, centrifugal force acts on the piston. This centrifugal force causes the piston to move in a manner that overcomes the force of the coil spring, causing the volume of the second chamber to decrease. As the second chamber decreases, the air pressure within it increases. When the air pressure inside the tire is lower than the reference air pressure, the first umbrella valve opens, injecting air into the second chamber into the tire's internal space.

[0007] If the car decelerates and the wheels rotate slower, the piston moves in the direction of increasing the volume of the second chamber due to the force of the coil spring. If the pressure in the second chamber decreases and becomes lower than the air pressure inside the tire, the first umbrella valve closes. During the piston's movement, if the pressure in the second chamber is lower than the pressure in the first chamber, the second umbrella valve opens, allowing air to flow from the first chamber into the second chamber.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2008-308081 Summary of the Invention

[0011] The problem the invention aims to solve

[0012] In the aforementioned air pressure adjustment device, the cylinder is screwed into the spokes so that it protrudes from the outer circumference of the wheel rim into the internal space of the tire. However, there are many types of wheels, such as automobiles, and there are cases where the aforementioned air pressure adjustment device cannot be installed in the proper position due to the shape of the spokes, etc. The aforementioned air pressure adjustment device is not properly installed on a wide variety of wheels; therefore, there is room for improvement in terms of versatility.

[0013] The present disclosure aims to provide a highly versatile tire air filling device.

[0014] Solution for solving the problem

[0015] The tire air filling device disclosed herein is (1) a tire air filling device installed on a wheel of a tire, which compresses air and fills the tire with air. The tire air filling device includes: a cylinder having a first opening communicating with the tire; and a weight disposed inside the cylinder having an air passage for air to flow to the tire, the weight being moved in the axial direction of the cylinder by centrifugal force, supplying air to the tire from the first opening. The tire air filling device includes: an airtight member for the weight disposed between the weight and the inner surface of the cylinder; a spring for the weight applying force to the weight on the opposite side of the tire; and an tilting member installed on the one-way valve and the cylinder in a state where the cylinder is tilted relative to the one-way valve, the one-way valve preventing backflow of air from the tire to the interior of the cylinder.

[0016] In this tire air filling device, the cylinder has a first opening communicating with the inside of the tire. Inside the cylinder, a weight is placed to supply air to the inside of the tire via the first opening. The weight moves along the cylinder's axis due to centrifugal force, thereby filling the tire with air. The tire air filling device includes a tilting member installed with a one-way valve, which prevents backflow of air from the tire into the cylinder, tilted relative to the cylinder. Therefore, by having the tilting member between the one-way valve and the cylinder, the orientation of the cylinder relative to the one-way valve can be changed. A tilting member with a tilt angle corresponding to the shape of the wheel can be installed between the cylinder and the one-way valve. By pre-preparing various tilting members with different tilt angles and selecting one corresponding to the shape of the wheel, the tire air filling device can be properly installed on various types of wheels. Therefore, the versatility of the tire air filling device can be improved.

[0017] (2) According to (1) above, at least one of the tilting member and the cylinder may have a weak part, which is more vulnerable than the one-way valve and may break due to external force. For example, if the wheel collides with a curb or the like during driving and the one-way valve installed on the wheel breaks, there is a possibility that the tire will leak air and the vehicle will be unable to move. In contrast, if the tilting member or the cylinder between the one-way valve and the cylinder has a weak part as described above, even if the wheel is subjected to an impact force, it is this weak part that breaks. Since the breakage of the one-way valve can be suppressed by utilizing the breakage of the weak part provided in at least one of the tilting member and the cylinder, the leakage of air from the tire caused by the impact force on the wheel can be suppressed more reliably.

[0018] (3) According to (1) or (2) above, the aforementioned tire air filling device may also include multiple airtight components for loads. Alternatively, the multiple airtight components for loads may be arranged along the axial direction. Alternatively, the cross-section of the multiple airtight components for loads, when cut with a plane extending along the axial direction, may be U-shaped with an open end. Alternatively, the multiple airtight components for loads may be arranged such that the open end faces the first opening side. However, when using O-rings as airtight components, higher dimensional accuracy is required depending on the inner diameter of the cylinder or the outer diameter of the load. In contrast, when using airtight components for loads with a U-shaped cross-section when cut with a plane extending along the axial direction, this dimensional accuracy can be mitigated. The open ends of the U-shape of the multiple airtight components for loads face the first opening side. Therefore, the sliding resistance when the load returns due to the force of the load spring can be reduced, making it difficult for the air compressed into the tire to leak.

[0019] (4) According to any one of (1) to (3) above, the aforementioned tire air filling device may also include an anti-backflow valve, which is located inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. Alternatively, the anti-backflow valve may have a sliding member that slides in the axial direction within the air passage. Alternatively, the specific gravity of the sliding member may be less than the specific gravity of the weight. In this case, when the centrifugal force increases and the weight moves toward the first opening side (tire side), and the air pressure on the first opening side of the cylinder increases, the movement of the sliding member can be suppressed, preventing the anti-backflow valve from opening unexpectedly. Therefore, air can be supplied to the tire side more efficiently using the weight.

[0020] (5) According to any one of (1) to (4) above, the cylinder may also have a second opening on the side opposite to the first opening. Alternatively, the tire air filling device may include a cover that can be detached from the second opening. In this case, when not in use, for example, the cover can be opened to open the second opening, allowing air to be forcibly supplied to the tire through the second opening. When in use, the cover can be closed, and air can be filled into the tire by centrifugal force. Furthermore, when the vehicle stops, the cover can be removed to directly supply air to the tire through the second opening.

[0021] (6) According to any one of (1) to (5) above, the aforementioned tire air filling device may also include an anti-backflow valve, which is disposed inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. Alternatively, the anti-backflow valve may have: a sliding member that slides in the axial direction within an air passage; and an anti-backflow valve spring that applies force to the sliding member towards the opposite side of the tire. Alternatively, the one-way valve may have: a valve seat portion having an air hole; a valve core portion that slides within the air hole; and a one-way valve spring that applies force to the valve core towards the opposite side of the tire. Alternatively, the spring constant of the one-way valve spring may be larger than the spring constant of the anti-backflow valve spring. In this case, because the spring constant of the one-way valve spring is larger than the spring constant of the anti-backflow valve spring, air leakage from the tire at the one-way valve can be suppressed more reliably.

[0022] (7) According to any one of (1) to (6) above, the aforementioned tire air filling device may also include an anti-backflow valve, which is disposed inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. Alternatively, the anti-backflow valve may include: a sliding member that slides in the axial direction within an air passage; and an anti-backflow valve spring that applies force to the sliding member towards the opposite side of the tire. Alternatively, the one-way valve may include: a valve seat portion having an air hole; a valve core portion that slides within the air hole; and a one-way valve spring that applies force to the valve core portion towards the opposite side of the tire. Alternatively, the set load of the one-way valve spring may be greater than the set load of the anti-backflow valve spring. In this case, by making the set load of the one-way valve spring greater than the set load of the anti-backflow valve spring, air leakage from the tire at the one-way valve can be suppressed more reliably.

[0023] (8) According to any one of (1) to (7) above, the aforementioned tire air filling device may also include an anti-backflow valve, which is disposed inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. Alternatively, the weight may have a housing portion for housing the anti-backflow valve, with at least a portion of the housing portion inserted into a weight spring. In this case, at least a portion of the housing portion for the anti-backflow valve is inserted into the weight spring. By inserting the weight spring into the housing portion of the weight, the internal space change of the cylinder caused by the movement of the weight can be increased. Even without increasing the size of the cylinder, the internal pressure generated by the cylinder can be increased, thus enabling efficient air supply to the tire and contributing to the compactness of the components.

[0024] The effects of the invention

[0025] According to this disclosure, a highly versatile tire air filling device can be provided. Attached Figure Description

[0026] Figure 1 This is a schematic side view of the tire air filling device, tire, and wheel according to the embodiment.

[0027] Figure 2 yes Figure 1 A sectional view of the tire air filling device along the AA line.

[0028] Figure 3 This is an exploded perspective view showing the embodiment of the tire air filling device.

[0029] Figure 4 This is a cross-sectional view showing an embodiment of a tire air filling device.

[0030] Figure 5 This indicates that it is installed with Figure 4 Cross-sectional view of the tire air filling device with different inclined members.

[0031] Figure 6 It is a cross-sectional view showing the state of the weak part of the inclined member having broken.

[0032] Figure 7 This is a cross-sectional view showing a modified tire air filling device.

[0033] Figure 8 This is a perspective view of a tire air filling device, showing a further variation.

[0034] Figure 9 From and Figure 8 Observing from different directions Figure 8 The image obtained from the tire air filling device.

[0035] Figure 10 It means Figure 8 A cross-sectional view of a tire air filling device. Detailed Implementation

[0036] The following is a reference to the appendix. Figure 1 The embodiments of the tire air filling device of this disclosure will be described below. In the description of the drawings, the same or equivalent elements are labeled with the same reference numerals, and repeated descriptions are omitted where appropriate. For ease of understanding, the drawings may contain partial simplifications or exaggerations, and the scales are not limited to those shown in the drawings.

[0037] Figure 1 The illustration shows a wheel 100 and a tire 110 equipped with the tire air filling device 1 of this embodiment. For example, multiple wheels 100 and multiple tires 110 are provided in a car. Each wheel 100 and each tire 110 rotates as the car moves.

[0038] The wheel 100 has multiple spokes 101. The multiple spokes 101 extend radially from the center portion 102 of the wheel 100. A rim 103 of the wheel 100 is provided on the radially outer side of the multiple spokes 101. A tire 110 is mounted on the rim 103.

[0039] The tire air filling device 1 is mounted, for example, across the two spokes 101. The tire air filling device 1 is disposed, for example, between the center portion 102 of the wheel 100 and the rim 103. The tire air filling device 1 is subjected to the radial centrifugal force of the tire 110 as the vehicle moves and the wheel 100 and tire 110 rotate.

[0040] The tire air filling device 1 generates compressed air based on the centrifugal force exerted by the rotation of the tire 110 and fills the inside of the tire 110 with compressed air. The wheel 100 may have one or more tire air filling devices 1. Alternatively, multiple tire air filling devices 1 may be provided on each of the multiple tires 110. Figure 1 The example shown is a tire air filling device 1 installed on a tire 110.

[0041] The tire air filling device 1 includes a main body 2 for generating compressed air to supply to the tire 110 and a mounting member 3 for mounting the main body 2 to the wheel 100. The main body 2 includes a cylinder 11, a one-way valve 20, and a tilting member 15. The cylinder 11 generates compressed air internally, and the one-way valve 20 prevents air from flowing back from the tire 110 to the cylinder 11. The tilting member 15 connects the cylinder 11 and the one-way valve 20 to each other.

[0042] For example, the one-way valve 20 is mounted on the wheel 100 (as an example, the rim 103). The internal space of the one-way valve 20 is in communication with the internal space of the tire 110. Therefore, compressed air generated inside the cylinder 11 is supplied to the internal space of the tire 110 via the tilting member 15 and the one-way valve 20. In this embodiment, the device body 2 includes the tilting member 15, which is mounted on the one-way valve 20 and the cylinder 11 in a state where the one-way valve 20 is tilted relative to the cylinder 11.

[0043] Figure 2 yes Figure 1 A sectional view along line AA of the tire air filling device 1. (See attached image.) Figure 1 and Figure 2 As shown, the mounting member 3, as an example, includes a clamp 4 and a plurality of bolts 5. The clamp 4 includes, for example, a first clamping portion 4b and a second clamping portion 4c for clamping the device body 2. For example, the device body 2 is mounted to the wheel 100 in a manner extending along a first direction D1, which is the radial direction of the tire 110. The clamp 4 extends along a second direction D2, which intersects the first direction D1. The second direction D2 corresponds to the direction in which a pair of spokes 101 are arranged.

[0044] As an example, the length of the first clamping portion 4b in the second direction D2 is longer than the length of the second clamping portion 4c in the second direction D2. For example, the first clamping portion 4b is mounted on the spoke 101 and the second clamping portion 4c. The first clamping portion 4b has a pair of end portions 4d arranged along the second direction D2 and a central portion 4f located between the pair of end portions 4d.

[0045] The first clamping portion 4b and the second clamping portion 4c are stacked, for example, along a third direction D3 that intersects both the first direction D1 and the second direction D2. The third direction D3 corresponds to the thickness direction of the first clamping portion 4b and the second clamping portion 4c. With the second clamping portion 4c stacked with the first clamping portion 4b, a pair of end portions 4d protrude relative to the second clamping portion 4c in the second direction D2. A through hole 4g ​​is formed in each pair of end portions 4d for a bolt 5 screwed into the spoke 101 to pass through.

[0046] The central portion 4f is the area where the second clamping portion 4c is stacked. The central portion 4f has a protrusion 4h that protrudes relative to the end portion 4d and a recess 4j that is recessed in the center of the protrusion 4h in the second direction D2. A threaded hole 4k is formed in the protrusion 4h for a bolt 5 that passes through the second clamping portion 4c to be screwed in. The recess 4j is the area where the device body 2 enters, and for example, it is designed to have a shape similar to the outer periphery of the device body 2. As an example, the recess 4j is arc-shaped.

[0047] The second clamping part 4c has a pair of end portions 4p arranged along the second direction D2 and a central part 4q located between the pair of end portions 4p. A through hole 4r is formed on each pair of end portions 4p for a bolt 5 to be screwed into the threaded hole 4k of the first clamping part 4b. The central part 4q is the portion opposite to the central part 4f of the first clamping part 4b along the third direction D3.

[0048] The central portion 4q bends away from the recess 4j as it moves toward the center in the second direction D2. The central portion 4q and the recess 4j together form a space through which the device body 2 passes. In this space, a cushioning material 6 is disposed, for example, between the clamp 4 and the device body 2. As an example, multiple cushioning materials 6 are positioned between the clamp 4 and the device body 2. The above describes an example of the structure of the mounting member 3 and the clamp 4. However, the structure of the mounting member 3 and the clamp 4 is not limited to the above example and can be appropriately modified.

[0049] Next, while referring to Figure 3 and Figure 4 The structure of the tire air filling device 1 (device body 2) will be explained. For example... Figure 3 and Figure 4 As shown, the tire air filling device 1 includes a cylinder 11, a weight 12, and an airtight member 13 for the weight. The cylinder 11 is cylindrical. The weight 12 moves inside the cylinder 11 in a first direction D1 corresponding to the axial direction of the cylinder 11. The airtight member 13 for the weight is located between the inner surface 11b of the cylinder 11 and the weight 12. The cylinder 11 has a first opening 11r located on the tire 110 side (one-way valve 20 side) and a second opening 11c located on the side opposite to the tire 110. As an example, grease may be applied between the airtight member 13 for the weight and the inner surface 11b.

[0050] The cylinder 11, for example, has a flange portion 11d for mounting the mounting member 3. The mounting member 3 is mounted to a pair of spokes 101 with the mounting member 3 mounted on the flange portion 11d. Thus, the tire air filling device 1 can be mounted to the pair of spokes 101 in a stable state. As an example, the weight 12 is cylindrical. The width W1 of the weight 12 is, for example, 5 mm or more and 15 mm or less. The width W1 is 15 mm or less, thereby effectively increasing the air pressure generated as the weight 12 moves in the first direction D1.

[0051] As an example, the length L1 of the weight 12 in the first direction D1 is more than 20 mm and less than 45 mm. The length L1 is less than 45 mm, which ensures a large amount of movement of the weight 12 inside the cylinder 11. However, the values ​​of the width W1 and the length L1 are not limited to the example above.

[0052] The weight 12 and the airtight member 13 divide the internal region of the cylinder 11 into a first region A1 on the side of the tire 110 and a second region A2 on the opposite side of the tire 110. The weight 12 and the airtight member 13 reciprocate inside the cylinder 11 along a first direction D1 corresponding to the radial direction of the wheel 100.

[0053] Cylinder 11 is, for example, cylindrical. Cylinder 11 has a second opening 11c that allows air to flow into a second region A2 of cylinder 11. A cover member 14 is installed in the second opening 11c. The second opening 11c and the cover member 14 are positioned on the opposite side of tire 110 when viewed from the weight 12. Figure 3 The middle is the lower side, in Figure 4 (The middle is the left side). The cover member 14 is, for example, a filter that allows gases such as air to pass through, but does not allow liquids and solids to pass through.

[0054] As an example, the cover member 14 has: a sealing portion 14b that seals the second opening 11c; a protrusion 14c that protrudes relative to the sealing portion 14b in the first direction D1; and an engaging portion 14d located at the end of the protrusion 14c. The sealing portion 14b allows gas to pass from the outside of the cylinder 11 to the inside of the cylinder 11. The sealing portion 14b blocks the entry of liquids and solids into the inside of the cylinder 11. The sealing portion 14b is, for example, in the shape of a circular plate.

[0055] The protrusion 14c is, for example, an annular portion that protrudes radially inward from the sealing portion 14b in the first direction D1. The engaging portion 14d has a convex portion 14f at the end of the protrusion 14c that protrudes radially outward from the protrusion 14c. The convex portion 14f has a tapered surface 14g that is inclined in a manner that decreases in diameter as it moves away from the sealing portion 14b.

[0056] The second opening 11c is formed, for example, by dividing a first protrusion 11f that protrudes radially inward in the internal space of the cylinder 11 and a second protrusion 11g located between the first protrusion 11f and the weight 12. The second protrusion 11g has an abutment surface 11h for the weight 12, which moves in the first direction D1, to abut against.

[0057] The first protrusion 11f is located between the second protrusion 11g and the end face 11j of the cylinder 11, and protrudes radially inward relative to the second protrusion 11g. The first protrusion 11f has a conical surface 11k opposite to the protrusion 14c of the cover member 14. The conical surface 11k is inclined in a manner that protrudes radially inward toward the cylinder 11 as it moves away from the end face 11j. The cover member 14 engages with the cylinder 11 by the conical surface 14g passing over the conical surface 11k and the protrusion 14f engaging radially inward with the second protrusion 11g. An O-ring 17 is located between the cover member 14 and the cylinder 11. The O-ring 17 ensures an airtight seal between the cover member 14 and the cylinder 11.

[0058] Air flows into the weight 12 through the second opening 11c of the cover member 14 and the cylinder 11. The weight 12 is, for example, cylindrical. An annular recess 12g is formed on the outer peripheral surface 12f of the weight 12. The weight enters the annular recess 12g through an airtight member 13.

[0059] The tire air filling device 1 includes a plurality of airtight components 13 for loads. The plurality of airtight components 13 for loads are arranged along a first direction D1. The cross-section of the plurality of airtight components 13 when cut along a plane arranged along the first direction D1 is U-shaped with an open end 13b. In this disclosure, "U-shaped" refers not only to a tight U-shape, but also includes shapes slightly different from a U-shape, such as a V-shape or a C-shape. As an example, the airtight components 13 for loads are lip seals. The plurality of airtight components 13 for loads are arranged such that the open end 13b faces the first opening 11r side of the cylinder 11. The sliding resistance when the weight 12 returns due to the force of the weight spring 16 is less than the sliding resistance when the weight 12 moves towards the tire 110 side.

[0060] An air passage 12b is formed on the weight 12 to allow incoming air to flow to the side opposite to the second opening 11c. For example, the air passage 12b includes a first space portion 12c located on the side of the second opening 11c and a second space portion 12d extending from the first space portion 12c toward the tire 110 side. As an example, the second space portion 12d is enlarged relative to the first space portion 12c. The second space portion 12d is formed by a conical surface 12r that gradually enlarges in diameter away from the first space portion 12c and an inner peripheral surface 12s between the conical surface 12r and the first region A1.

[0061] The weight 12 is made of, for example, a tungsten-containing material. The weight 12 may also be made of tungsten or a tungsten alloy. The weight 12 is, for example, a high-specific-gravity material with a specific gravity greater than that of the specific gravity cylinder 11. As an example, the specific gravity of the weight 12 is 15 or higher. In this case, the diameter of the weight 12 can be reduced, and the mass of the weight 12 can be increased. Therefore, the reciprocating motion of the weight 12 in the first direction D1 generated by centrifugal force can be sufficiently performed, and the air supply to the tire 110 can be more efficient.

[0062] The tire air filling device 1 includes a weight spring 16 arranged to extend from the weight 12 toward the tire 110. The weight spring 16 is a spring that applies force from the weight 12 toward the opposite side of the tire 110. The weight 12 has: a storage section 12h for storing the anti-backflow valve 30 (discussed later); and a large-diameter section 12j having a diameter larger than that of the storage section 12h.

[0063] A spring 16 for receiving weights is inserted into at least a portion of the receiving portion 12h. The receiving portion 12h and the large-diameter portion 12j are, for example, cylindrical. The outer diameter of the receiving portion 12h is smaller than the inner diameter of the cylinder 11. A gap S is formed between the outer surface of the receiving portion 12h and the inner surface 11b of the cylinder 11. An annular recess 12g is formed on the outer surface of the large-diameter portion 12j. An airtight member 13 for receiving weights enters the annular recess 12g.

[0064] The storage section 12h has an annular protrusion 12p protruding radially outward from the large-diameter section 12j. An annular recess 12m is formed between the annular protrusion 12p and the large-diameter section 12j. The weight is inserted into the annular recess 12m by an airtight member 13. A weight spring 16 is disposed between the annular protrusion 12p and the tilting member 15.

[0065] The tire air filling device 1 includes an anti-backflow valve 30 to prevent air from flowing back from the weight 12 to the opposite side of the tire 110. The anti-backflow valve 30 includes a sliding member 31, an anti-backflow valve spring 32, a support portion 33, and an airtight member 34. The sliding member 31 slides, for example, in the air passage 12b in a first direction D1. The anti-backflow valve spring 32 applies force to the sliding member 31 towards the opposite side of the tire 110. The support portion 33 supports the end of the anti-backflow valve spring 32 in the first direction D1. The airtight member 34 is located between the inner surface of the air passage 12b and the sliding member 31.

[0066] The specific gravity of the sliding member 31 is, for example, less than that of the weight 12. The sliding member 31 is, for example, made of aluminum. The sliding member 31 slides along a first direction D1 in the air passage 12b (second space 12d) of the weight 12. The sliding member 31 includes: an end face 31b opposite to the first space 12c; an inclined surface 31c extending from the end face 31b along a conical surface 12r; and a shaft portion 31d extending from the inclined surface 31c toward the support portion 33 and partially entering the support portion 33.

[0067] An annular recess 31f is formed on the inclined surface 31c of the sliding member 31. An airtight member 34 for the anti-backflow valve enters the annular recess 31f. The airtight member 34 for the anti-backflow valve is, for example, an O-ring. The airtight member 34 for the anti-backflow valve is, for example, made of EPDM. Lubricant may also be applied between the airtight member 34 for the anti-backflow valve and the inner surface of the air passage 12b.

[0068] The anti-backflow valve spring 32 is made of, for example, SUS (Stainless Steel). The anti-backflow valve spring 32 is disposed in the second space 12d. The anti-backflow valve spring 32 is located radially outward of the shaft portion 31d of the sliding member 31, extending in the first direction D1 between the sliding member 31 and the support portion 33. The support portion 33 is, for example, made of aluminum. The support portion 33 is a bearing for the shaft portion 31d of the sliding member 31.

[0069] The sliding member 31 and the airtight member 34 for the anti-backflow valve are movable relative to the support 33 in the first direction D1. When the sliding member 31 and the airtight member 34 for the anti-backflow valve move relative to the weight 12 toward the opposite side of the tire 110, the airtight member 34 for the anti-backflow valve abuts against the conical surface 12r and blocks the air passage 12b. On the other hand, when the sliding member 31 and the airtight member 34 for the anti-backflow valve move relative to the weight 12 toward the tire 110, the air passage 12b is opened.

[0070] Next, the one-way valve 20 will be described. The one-way valve 20 is, for example, installed in an air hole formed in the wheel 100. Air is supplied from the one-way valve 20 through this air hole to the internal space of the tire 110. For example, a portion of the components of the one-way valve 20 has the same shape as the components included in the weight 12. This allows for the standardization of components, thus contributing to a reduction in the cost of the components.

[0071] The one-way valve 20 includes: a valve seat portion 21 having an air hole 21h through which air from the first region A1 of the cylinder 11 and the air flow path 15b of the inclined member 15 passes; and a valve core portion 22 that slides along the extending direction D4 of the air hole 21h while passing through the air hole 21h. The one-way valve 20 also includes: a one-way valve spring 23 that supports the valve core 22 on the opposite side of the tire 110 (in...). Figure 4 The force is applied in the direction of left-sloping downwards; and the support part 24, which supports the end of the one-way valve spring 23 on the side near the tire 110.

[0072] The valve seat portion 21 is, for example, made of aluminum. The valve seat portion 21 has, for example, a first mounting portion 21b, which is mounted on the inclined member 15; and a second mounting portion 21c, which is mounted on the wheel 100. For example, the shape of the valve seat portion 21 is similar to the shape of the weight 12. The valve seat portion 21 has, for example, a first air flow path 21d, located inside the first mounting portion 21b; and a second air flow path 21f, communicating with the first air flow path 21d, and housing the valve core portion 22, the one-way valve spring 23, and the support portion 24.

[0073] The valve seat 21 is mounted to the inclined member 15, for example, by screwing the first mounting portion 21b into the inclined member 15. For example, an O-ring 25 is provided between the valve seat 21 and the inclined member 15 to ensure an airtight seal. The second mounting portion 21c is provided with, for example, two nuts 21g and a sealing member 21j. The second mounting portion 21c is mounted to the wheel 100 by means of the two nuts 21g and the sealing member 21j.

[0074] The valve core 22 includes a sliding member 22b that slides in the extending direction D4 while passing through the air hole 21h, and an airtight member 22c mounted on the sliding member 22b. At least one of the shape and material of the sliding member 22b is the same as at least one of the shape and material of the aforementioned sliding member 31.

[0075] For example, the material of the spring 23 for the check valve is the same as the material of the spring 32 for the anti-backflow valve. The spring constant of the spring 23 for the check valve is greater than the spring constant of the spring 32 for the anti-backflow valve. For example, the set load of the spring 23 for the check valve is greater than the set load of the spring 32 for the anti-backflow valve. For example, the load (holding force) at which the check valve 20 begins to move is greater than the load at which the anti-backflow valve 30 begins to move. The support portion 24 is, for example, provided to have the same shape as the support portion 33 of the anti-backflow valve 30.

[0076] The support portion 24 serves as the bearing for the sliding member 22b. The space on the side opposite to the one-way valve spring 23, as viewed from the support portion 24, communicates with the internal space of the tire 110. The sliding member 22b and the airtight member 22c are designed to be movable relative to the support portion 24 in the extending direction D4. When the sliding member 22b and the airtight member 22c move to the side opposite to the tire 110, the air hole 21h of the valve seat portion 21 is blocked. On the other hand, when the sliding member 22b and the airtight member 22c move towards the tire 110 side, the air hole 21h is opened.

[0077] Next, the tilting member 15 will be described. The tilting member 15 is a component used to tilt the extension direction D4 of the one-way valve 20 relative to the first direction D1, which is the extension direction of the cylinder 11. The tilting member 15 includes, for example, a first part 15c for mounting the cylinder 11, a second part 15d for mounting the one-way valve 20, and a weak part 15f located between the first part 15c and the second part 15d.

[0078] Part 15c and Part 25d are, for example, cylindrical. The axial direction of Part 15c is aligned with the first direction D1. The axial direction of Part 25d is aligned with the extension direction D4. The tilting member 15 is a component used to tilt the one-way valve 20 relative to the extension direction of the cylinder 11. For example, various tilting members 15 are prepared.

[0079] like Figure 4 and Figure 5 As shown, among the various tilting members 15, the tilt angle θ of the axial direction of the second part 15d relative to the axial direction of the first part 15c is different for each of them. By preparing various tilting members 15 with different tilt angles θ in advance (e.g., before the tire air filling device 1 is installed on the wheel 100), it is possible to install the tire air filling device 1 at an appropriate angle on various wheels 100. Therefore, this contributes to improving the versatility of the tire air filling device 1.

[0080] The tilting member 15 is a connecting component that links the cylinder 11 and the one-way valve 20 together. For example, the cylinder 11 is screwed into the first part 15c, and the one-way valve 20 is screwed into the second part 15d. The air passage 15b of the tilting member 15 communicates with the first region A1 of the cylinder 11 and the air port 21h of the one-way valve 20. An O-ring 15h is disposed between the cylinder 11 and the tilting member 15 to ensure an airtight seal.

[0081] like Figure 4 and Figure 6As shown, the vulnerable part 15f is the part that breaks when an external force is applied to the tire air filling device 1. The vulnerable part 15f is provided, for example, between the first recess 15j and the second recess 15k. The first recess 15j is the part that bends from the first part 15c to the second part 15d, and the second recess 15k is formed at the end of the first part 15c on the side opposite to the cylinder 11.

[0082] When an external force is applied, the vulnerable portion 15f of the tilting member 15 fractures preferentially, thereby preventing damage to the one-way valve 20 caused by the application of such an external force. Alternatively, the cylinder 11 may have a vulnerable portion instead of the vulnerable portion 15f of the tilting member 15. In this case, the cylinder 11 fractures preferentially upon the application of an external force, thus preventing damage to the one-way valve 20 in the same manner as described above.

[0083] Next, while referring to Figure 4 An example of the operation of the tire air filling device 1 will be explained. For example, when the car equipped with the tire air filling device 1 is stationary, the weight 12 is positioned on the opposite side of the tire 110 due to the force of the spring 16. Figure 4 (The middle is the left side).

[0084] At this time, the sliding member 31 inside the weight 12 is located on the opposite side of the tire 110 due to the force of the anti-backflow valve spring 32, and the anti-backflow valve airtight member 34 seals the air passage 12b. The valve core 22 of the one-way valve 20 is located on the opposite side of the tire 110 due to the force of the one-way valve spring 23 (in Figure 4 (The middle is diagonally below the left), the valve core 22 seals the air hole 21h.

[0085] If the car accelerates, it will be subjected to centrifugal force generated by the rotation of wheel 100, and the weight 12 will overcome the force of spring 16 and move towards tire 110 (in). Figure 4 (The middle is the right side) moves. At this time, air enters the second region A2 of the cylinder 11 from the cover member 14 as the weight 12 moves towards the tire 110 side. As the weight 12 moves towards the tire 110 side, the air pressure in the first region A1 increases, and air flows from the first region A1 through the air flow path 15b of the inclined member 15 to the one-way valve 20, and the valve core 22 opens the air hole 21h. Due to the opening of the air hole 21h, the air flowing to the one-way valve 20 is injected towards the inside of the tire 110.

[0086] When the car is traveling at, for example, 40 km / h, the weight 12 is positioned next to the tire 110 and is compressed by the spring 16. When the air pressure in the tire 110 is lower than the air pressure in the first region A1, the valve core 22 opens the air hole 21h, supplying air from the first region A1 to the inside of the tire 110 via the air hole 21h. Conversely, when the air pressure in the tire 110 is higher than the air pressure in the first region A1, the valve core 22 blocks the air hole 21h, preventing air supply to the tire 110.

[0087] If the car decelerates, the weight 12 moves to the opposite side of the tire 110 due to the force of the weight spring 16. At this time, the sliding member 31 inside the weight 12 overcomes the force of the anti-backflow valve spring 32 and moves relative to the weight 12 towards the tire 110, and the anti-backflow valve airtight member 34 opens the air passage 12b. Due to the opening of the air passage 12b, air from the second region A2 of the cylinder 11 enters the first region A1 through the air passage 12b. And, when the car stops, it returns to normal. Figure 4 The initial state is shown.

[0088] Next, the effects obtained by the tire air filling device 1 of this embodiment will be explained. In the tire air filling device 1, the cylinder 11 has a first opening 11r that communicates with the inside of the tire 110. Inside the cylinder 11, a weight 12 is provided to supply air to the inside of the tire 110 through the first opening 11r. The weight 12 moves in the axial direction (first direction D1) of the cylinder 11 due to centrifugal force, thereby filling the tire 110 with air.

[0089] A one-way valve 20 is provided between the cylinder 11 and the tire 110 to prevent air from flowing back from the tire 110 into the interior of the cylinder 11. Furthermore, the tire air filling device 1 includes a tilting member 15 installed so that the one-way valve 20 is tilted relative to the cylinder 11. Therefore, by positioning the tilting member 15 between the one-way valve 20 and the cylinder 11, the orientation of the one-way valve 20 relative to the cylinder 11 can be changed.

[0090] An inclined member 15 having an inclination angle θ corresponding to the shape of the wheel 100 can be installed between the cylinder 11 and the one-way valve 20. By pre-preparing various inclined members 15 with different inclination angles and selecting an inclined member 15 corresponding to the shape of the wheel 100, the tire air filling device 1 can be properly installed on various wheels 100. Therefore, the versatility of the tire air filling device 1 can be improved.

[0091] At least one of the tilting member 15 and cylinder 11 may also have a vulnerable portion (e.g., vulnerable portion 15f), which is more vulnerable than the one-way valve 20 and may break due to external force. For example, if the one-way valve 20 installed on the wheel 100 breaks due to a collision with a curb or the like during driving, air may leak from the tire 110, making it impossible to drive. In contrast, if the tilting member 15 or cylinder 11, which is located between the one-way valve 20 and cylinder 11, has a vulnerable portion as described above, even if the wheel 100 is subjected to an impact force, it is this vulnerable portion that breaks. Since the breakage of the vulnerable portion provided in at least one of the tilting member 15 and cylinder 11 can be used to suppress the breakage of the one-way valve 20, it is possible to more reliably suppress air leakage from the tire 110 caused by the impact force on the wheel 100.

[0092] In this embodiment, the tire air filling device 1 includes a plurality of airtight components 13 for heavy objects. The plurality of airtight components 13 for heavy objects are arranged along an axial direction (e.g., a first direction D1). The cross-section of the plurality of airtight components 13 for heavy objects when cut with a plane extending along the axial direction is U-shaped with an open end 13b. The plurality of airtight components 13 for heavy objects are arranged such that the open end 13b faces the first opening 11r side.

[0093] However, when using O-rings as airtight components for heavy objects, high dimensional accuracy is required depending on factors such as the inner diameter of the cylinder or the outer diameter of the heavy object. In contrast, using airtight components 13 for heavy objects, whose cross-section is U-shaped when cut along a plane extending along the axial direction, can alleviate this dimensional accuracy requirement. The open ends 13b of the U-shape of the plurality of airtight components 13 for heavy objects face the first opening 11r. Therefore, the sliding resistance of the heavy object 12 when it returns due to the force of the heavy object spring 16 can be reduced, making it difficult for the air compressed into the tire 110 to leak.

[0094] In this embodiment, the tire air filling device 1 includes an anti-backflow valve 30, which is disposed inside the weight 12 to prevent air from flowing back from the weight 12 to the opposite side of the tire 110. The anti-backflow valve 30 has a sliding member 31 that slides in the axial direction within the air passage 12b. The specific gravity of the sliding member 31 is less than that of the weight 12. When the centrifugal force increases and the weight 12 moves toward the first opening 11r side (tire 110 side), the movement of the sliding member 31 can be suppressed when the air pressure on the first opening 11r side of the cylinder 11 increases, preventing the anti-backflow valve 30 from opening unexpectedly. Therefore, air can be supplied to the tire 110 side more efficiently using the weight 12.

[0095] In this embodiment, the tire air filling device 1 includes an anti-backflow valve 30, which is disposed inside the weight 12 to prevent air from flowing back from the weight 12 to the opposite side of the tire 110. The anti-backflow valve 30 includes: a sliding member 31 that slides in the axial direction in the air passage 12b; and an anti-backflow valve spring 32 that applies force to the sliding member 31. The one-way valve 20 includes: a valve seat 21 having an air hole 21h; a valve core 22 that slides in the air hole 21h; and a one-way valve spring 23 that applies force to the valve core 22 towards the opposite side of the tire 110. The spring constant of the one-way valve spring 23 is larger than the spring constant of the anti-backflow valve spring 32. Because the spring constant of the one-way valve spring 23 is larger than the spring constant of the anti-backflow valve spring 32, air leakage from the tire 110 at the one-way valve 20 can be suppressed more reliably.

[0096] In this embodiment, the set load of the spring 23 for the check valve is greater than the set load of the spring 32 for the anti-backflow valve. Because the set load of the spring 23 for the check valve is greater than the set load of the spring 32 for the anti-backflow valve, air leakage from the tire 110 at the check valve 20 can be suppressed more reliably.

[0097] In this embodiment, the tire air filling device 1 includes an anti-backflow valve 30, which is disposed inside the weight 12 to prevent air from flowing back from the weight 12 to the opposite side of the tire 110. The weight 12 has a housing portion 12h for housing the anti-backflow valve 30, and at least a portion of the housing portion 12h is inserted into the weight spring 16. Since the housing portion 12h of the weight 12 is inserted into the weight spring 16, the internal space change of the cylinder 11 caused by the movement of the weight 12 can be increased. Even without increasing the size of the cylinder 11, the internal pressure generated by the cylinder 11 can be increased. Therefore, air can be supplied to the tire 110 efficiently, and it also contributes to the compactness of the components.

[0098] Next, while referring to Figure 7 The modified tire air filling device 41 will be described below. A portion of the structure of the tire air filling device 41 is the same as a portion of the structure of the aforementioned tire air filling device 1. Therefore, in the following descriptions, the same reference numerals will be used, and descriptions that are repeated with those of the tire air filling device 1 will be omitted as appropriate.

[0099] The tire air filling device 41 includes a cylinder 51 with a different shape from the cylinder 11 and a cover 52 that is detachable from the second opening 51c of the cylinder 51. In the tire air filling device 41, the cover member 14 is mounted to the cylinder 51 by means of the cover 52. The cylinder 51 has a cylindrical portion 51b that protrudes toward the cover member 14 and a recess 51d that is located radially outward of the cylindrical portion 51b and is recessed in the first direction D1. An external thread 51g is formed on the outer peripheral surface of the cylindrical portion 51b. An O-ring 51f is inserted into the recess 51d.

[0100] The cover 52 is cylindrical. The cover 52 has a engaging portion 52b for inserting the cover member 14 and a threaded engagement portion 52c that screws into the cylinder 51. The engaging portion 52b has a protrusion 52h protruding radially inward toward the cover 52. The protrusion 52h has a conical surface 52k that slopes in a direction away from the end face 52j of the cover 52 as it protrudes toward the protrusion 52h. The cover member 14 engages with the cover 52 by causing the conical surface 14g to pass over the conical surface 52k.

[0101] The threaded connection 52c is an internal thread that engages with the external thread 51g of the cylindrical portion 51b of the cylinder 51. The cover 52 is installed on the cylinder 51 by screwing the external thread 51g into the threaded connection 52c. The cover 52 is designed to be removable from the cylinder 51. Removing the cover 52 allows air to be forcibly introduced into the tire 110 from the second opening 51c through the cylinder 51, the tilting member 15, and the interior of the one-way valve 20.

[0102] In the modified tire air filling device 41 described above, the cylinder 51 has a second opening 51c on the side opposite to the first opening 11r. The tire air filling device 41 includes a cover 52 that is detachable from the second opening 51c. Therefore, when not in motion, the cover 52 is opened to open the second opening 51c, thereby allowing air to be forcibly supplied to the tire 110 from the second opening 51c. Therefore, when in motion, the cover 52 is closed, and the weight 12 fills the tire 110 with air using centrifugal force, and when the vehicle stops, the cover 52 can be removed to directly supply air to the tire 110 from the second opening 51c.

[0103] In the foregoing embodiment, a tire air filling device 1 equipped with a one-way valve 20 has been described. However, the tire air filling device may also not have a one-way valve. For example, it may be a tire air filling device with a one-way valve pre-installed on the wheel 100 of the tire 110. Hereinafter, with reference to Figure 8 , Figure 9 as well as Figure 10 One example is then provided.

[0104] Figure 8 This is a perspective view showing the tire air filling device 61 installed on the wheel 100. Figure 9 It means from and Figure 8 The image shows the tire air filling device 61 viewed from different directions. Figure 10 This is a cross-sectional view of the tire air filling device 61. Figures 8-10 To facilitate understanding, some of the diagrams have been simplified. For example... Figures 8-10 As shown, the tire air filling device 61 includes: a cylinder 11 having a first opening 11r communicating with the tire 110; and a weight 12 disposed inside the cylinder 11, which moves along the axis of the cylinder 11 under centrifugal force to supply air to the tire 110. Furthermore, the tire air filling device 61 includes a weight spring 16 and a weight airtight member 13 located between the weight 12 and the inner surface of the cylinder 11.

[0105] The wheel 100 has a TPMS (Tire Pressure Monitoring System) unit 105. The TPMS unit 105 includes, for example, a one-way valve and a pressure sensor that monitors the air pressure of the tire 110. For example, the tire air filling device 61 is connected to the TPMS unit 105 via a tube 63. The tube 63 has: a first connection portion 63b, which is connected to the tire air filling device 61; a second connection portion 63c, which is connected to the TPMS unit 105; and a tube body 63d, which extends from the first connection portion 63b to the second connection portion 63c. For example, the tube body 63d is made of a flexible material. In this case, the tube body 63d can be flexibly deformed.

[0106] The tire air filling device 61 has a cover assembly 62 installed in the first opening 11r of the cylinder 11. The cylinder 11 is connected to the pipe 63 via the cover assembly 62. The cover assembly 62 has an air flow path 62d communicating with the internal space of the pipe 63 and the internal space of the TPMS unit 105. Air from the cylinder 11 is supplied to the tire 110 via the air flow path 62d, the internal space of the pipe 63, and the internal space of the TPMS unit 105.

[0107] The cover assembly 62, for example, has a first cover portion 62c mounted on the cylinder 11 and a second cover portion 62f mounted on the first cover portion 62c. The airflow path 62d includes the internal spaces of the first cover portion 62c and the second cover portion 62f. The internal space of the cylinder 11 communicates with the internal space of the pipe 63 via the internal spaces of the first cover portion 62c and the second cover portion 62f. The second cover portion 62f is, for example, located adjacent to the cylinder 11. For example, in the tire air filling device 61, the cylinder 11 and the second cover portion 62f move from the first cover portion 62c in the same direction (in...) Figure 10 (The middle is the right side) extends. This allows the tire air filling device 61 to be compact.

[0108] The internal space of the first cover 62c extends from the cylinder 11 in the direction intersecting with the internal space of the cylinder 11 (in... Figure 10 Extending upwards (from the top), then in the same direction as the interior space of cylinder 11 (in... Figure 10 (The middle is the right side) bend. For example, the cover assembly 62 has a small cover 62b that is removable from the first cover portion 62c. The small cover 62b opens the air flow path 62d by removing it from the first cover portion 62c. With the small cover 62b removed and the air flow path 62d open, for example, air can enter the tire 110 from the portion where the small cover 62b has been removed.

[0109] The modified tire air filling device 61 described above does not have a one-way valve. In the tire air filling device 61, a weight 12 is provided to supply air to the inside of the tire 110 via a cover assembly 62, a pipe 63, and a TPMS unit 105. The weight 12 moves along the axis of the cylinder 11 due to centrifugal force, thereby filling the tire 110 with air. Therefore, the tire air filling device 61 achieves the same effect as the aforementioned tire air filling device 1, etc.

[0110] The embodiments and various modifications of the tire air filling device of this disclosure have been described above. However, the tire air filling device of this disclosure is not limited to the foregoing embodiments or modifications, and can be modified within the scope of the spirit of the claims, or it can be applied to other situations. That is, the shape, size, quantity, material, and configuration of the various parts of the tire air filling device are not limited to the foregoing examples, and can be appropriately changed.

[0111] For example, the example described above, where the weight 12 is made of tungsten or a tungsten alloy, was given. However, the material of the weight may also contain gold, and is not limited to tungsten or a tungsten alloy; it can be varied as appropriate. The same applies to the materials of components other than the weight, such as sliding members.

[0112] Explanation of reference numerals in the attached figures

[0113] 1. Tire air filling device; 2. Device body; 3. Mounting component; 4. Clamp; 4b. First clamping part; 4c. Second clamping part; 4d. End; 4f. Central part; 4g. Through hole; 4h. Protrusion; 4j. Recess; 4k. Threaded hole; 4p. End; 4q. Central part; 4r. Through hole; 5. Bolt; 11. Cylinder; 11b. Inner surface; 11c. 51c. Second opening; 11d. Flange; 11f. First protrusion; 11g. Second protrusion; 11h. Abutment surface; 11j. End face; 11k. Conical surface; 11r. First opening; 12. Weight; 12b. Air circulation hole; 12c. First space 12d, second space section; 12f, outer peripheral surface; 12g, annular recess; 12h, storage section; 12j, large diameter section; 12m, annular recess; 12p, annular protrusion; 12r, conical surface; 12s, inner peripheral surface; 13, airtight component for heavy objects; 13b, open end; 14, cover component; 14b, sealing part; 14c, protrusion; 14d, engaging part; 14f, protrusion; 14g, conical surface; 15, inclined component; 15b, airflow path; 15c, first part; 15d, second part; 15f, vulnerable part; 15h, O-ring; 15j, first recess; 15k, second recess; 16, spring for heavy objects; 20, one-way valve; 21. Valve seat; 21b. First mounting part; 21c. Second mounting part; 21d. First air flow path; 21f. Second air flow path; 21g. Nut; 21h. Air hole; 22. Valve core; 22b. Sliding member; 22c. Airtight member; 23. Spring for one-way valve; 24. Support part; 25. O-ring; 30. Anti-backflow valve; 31. Sliding member; 31b. End face; 31c. Inclined surface; 31d. Shaft part; 31f. Annular recess; 32. Spring for anti-backflow valve; 33. Support part; 34. Airtight member for anti-backflow valve; 51b. Cylindrical part; 51d. Recess; 51f. O-ring; 51g. External thread; 52. Cover; 52b, Engaging part; 52c, Threaded joint; 52h, Protrusion; 52j, End face; 52k, Conical surface; 61, Tire air filling device; 62, Cover assembly; 62b, Small cover; 62c, First cover part; 62d, Air flow path; 62f, Second cover part; 63, Tube; 63b, First connecting part; 63c, Second connecting part; 63d, Tube body; 100, Wheel; 101, Spoke; 102, Central part; 103, Rim; 110, Tire; A1, First region; A2, Second region; D1, First direction; D2, Second direction; D3, Third direction; D4, Extension direction; S, Gap; W1, Width; θ, Inclination angle.

Claims

1. A tire air-filling device, disposed on a wheel of a tire, wherein air is compressed and filled into the inside of the tire, wherein, The tire air filling device includes: A cylinder having a first opening communicating with the tire; A weight, disposed inside the cylinder, has an air passage for air to flow into the tire. The weight is subjected to centrifugal force and moves in the axial direction of the cylinder, supplying air to the tire from the first opening. An airtight component for heavy objects is located between the heavy object and the inner surface of the cylinder; A spring for a weight, which applies a force to the weight on the opposite side of the tire; and An inclined member is installed between the one-way valve and the cylinder so that the cylinder is tilted relative to the one-way valve, the one-way valve preventing air from flowing back from the tire into the interior of the cylinder.

2. The tire air filling device according to claim 1, wherein, At least one of the inclined member and the cylinder has a vulnerable part, which is more vulnerable than the one-way valve and is prone to breakage due to external force.

3. The tire air filling device according to claim 1 or 2, wherein, The tire air filling device includes multiple airtight components for heavy objects. Multiple weights are arranged along the axial direction using airtight components. When multiple airtight components for heavy objects are cut with a plane extending along the axial direction, the cross-section is U-shaped with an open end. The plurality of the airtight components for the weights are arranged such that the open ends face the first opening side.

4. The tire air filling device according to claim 1 or 2, wherein, The tire air filling device includes an anti-backflow valve, which is located inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. The anti-backflow valve has a sliding member that slides in the air passage in the axial direction. The specific gravity of the sliding component is smaller than that of the weight.

5. The tire air filling device according to claim 1 or 2, wherein, The cylinder has a second opening on the side opposite to the first opening. The tire air filling device includes a cover that can be detached from the second opening.

6. The tire air filling device according to claim 1 or 2, wherein, The tire air filling device includes an anti-backflow valve, which is located inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. The anti-backflow valve includes: a sliding member that slides in the air passage in the axial direction; and an anti-backflow valve spring that applies a force to the sliding member toward the opposite side of the tire. The one-way valve includes: a valve seat having an air hole; a valve core sliding in the air hole; and a spring for the one-way valve applying a force to the valve core toward the opposite side of the tire. The spring constant of the spring used in the one-way valve is greater than the spring constant of the spring used in the anti-backflow valve.

7. The tire air filling device according to claim 1 or 2, wherein, The tire air filling device includes an anti-backflow valve, which is located inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. The anti-backflow valve includes: a sliding member that slides in the air passage in the axial direction; and an anti-backflow valve spring that applies a force to the sliding member toward the opposite side of the tire. The one-way valve includes: a valve seat having an air hole; a valve core sliding in the air hole; and a spring for the one-way valve applying a force to the valve core toward the opposite side of the tire. The set load of the spring for the one-way valve is greater than the set load of the spring for the anti-backflow valve.

8. The tire air filling device according to claim 1 or 2, wherein, The tire air filling device includes an anti-backflow valve, which is located inside the weight to prevent air from flowing back from the weight to the opposite side of the tire. The weight has a housing section for accommodating the anti-backflow valve. The spring at least partially inserts the weight into the storage section.

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