JP2009269418A - Air supply device for tire of two-wheeler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air supply device for a tire of a two-wheeler, automatically supplying compressed air to the tire by the travel of the two-wheeler. <P>SOLUTION: A front fork 3 and an air pump 50 are arranged parallel to each other. A cylinder 51 is fitted to a boss 44 of a bottom pipe 41, and a piston rod 55 is fitted to a bottom bridge 43. A rubber hose 53 led from the cylinder 51 is connected to a hollow front wheel axle 6. The front wheel axle 6 is communicated with an axle side air chamber 64 provided in a hub 7 of a cast wheel, and the axle side air chamber 64 is communicated with a tire side air chamber 66 provided on the inner side of a tire 63 via an air passage 65 provided in a spoke 61. When the front fork 3 is expanded/contracted by the upper and lower motion of a front wheel 5 during the travel, a piston 52 is integrally advanced/retracted, and compressed air is generated in the cylinder 51 and supplied to the tire side air chamber 66. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a tire air supply device for a motorcycle that can automatically supply compressed air to a tire during traveling in a motorcycle or the like.

In a four-wheeled vehicle, an air compressor using an engine or motor as a drive source is installed in the vehicle body, high-pressure air produced by this air compressor is stored in an air tank, and high-pressure air from this air tank is automatically sent to tires. There is a tire air supply device to supply to.
JP 2002-87029 A

In the tire air supply device for a four-wheeled vehicle as in the above-described conventional example, there is a sufficient space in the vehicle, so it is possible to provide a compressor in the engine or mount a high-pressure pump on the vehicle body.
However, it is difficult to adopt the device configuration as in the above-described conventional example in a motorcycle in which the engine is compact and the degree of freedom of body layout cannot be increased as much as that of a four-wheeled vehicle.
SUMMARY OF THE INVENTION An object of the present invention is to realize a compact tire air supply device that can be mounted on a two-wheeled vehicle having a low degree of freedom in layout.

In order to solve the above-mentioned problem, the invention according to claim 1 relating to a tire air supply device for two-wheeled vehicles is a tire air supply device for two-wheeled vehicles that automatically supplies air from an air pump to a tire during traveling.
It is equipped with a repetitive motion member that repetitively moves depending on the road surface condition or human operation during driving, and a piston type air pump is operated by the repetitive motion of this repetitive motion member, and the compressed air produced by this air pump is automatically applied to the tire. It is characterized by supplying to.

The invention of claim 2 is the above-mentioned claim 1, wherein the repetitive operation member that performs repetitive operation according to the road surface condition during traveling is a suspension member or a handle damper,
The repetitive motion member that performs repetitive motion by human operation is a brake, clutch, change, or steering wheel operation member.
Note that the above-described artificial operation includes both manual operation and stepping operation.

According to a third aspect of the present invention, in the first aspect, the air pump is provided in a front fork, a rear suspension, a bridge member that supports the front fork, a rear brake pedal, a rear change pedal, or a handle lever. To do.

According to a fourth aspect of the present invention, in the first aspect, the compressed air is supplied from the air pump to an axle that forms a pipe shape of a front wheel or a rear wheel, and from a communication hole provided in the axle to an air chamber formed in the hub. And is further supplied from the air chamber into the tire through an air passage formed in the spoke.

According to a fifth aspect of the present invention, in the above-described fourth aspect, the axle passes through the hub, and a pair of bearings are provided between the axle and the hub with an interval in the axial direction of the axle, the pair of bearings, the axle, Forming the air chamber with the hub,
A seal member is provided between each of the bearings and the axle and the hub.

  According to the first aspect of the present invention, a repetitive motion member that repetitively moves according to a road surface condition or an artificial operation while traveling is used, and a compressed air is generated by operating a piston type air pump by repetitive motion of the repetitive motion member. Therefore, there is no need to provide a high-pressure pump or compressor driven by power. Moreover, since the piston-type air pump is relatively small and light, it can be mounted even on a two-wheeled vehicle having a low degree of freedom in layout. Moreover, it can be made inexpensive because of its simple structure.

  According to the second aspect of the present invention, since the air pump is driven by the repetitive motion member of the vehicle, it is possible to eliminate the need for driving by the power of the engine, the motor, etc., and the air pump can be made compact. Can improve fuel efficiency.

  According to the third aspect of the present invention, the air pump can be arranged by utilizing general equipment parts in a two-wheeled vehicle, and there is no need to provide a special member for arranging the air pump.

  According to the invention of claim 4, since the compressed air can be supplied to the tire by using the axle, the hub and the spoke, the structure can be simplified.

According to the invention of claim 5, the axle side air chamber can be easily formed by closing the axle hole of the hub by the pair of bearings in the axial direction of the axle. Moreover, by providing a seal between the bearing, the axle, and the hub, the axle-side air chamber can be hermetically sealed.

  Embodiments will be described below with reference to the drawings. 1 to 4 relate to the first embodiment, FIG. 1 is a left side view of the motorcycle according to the present embodiment, FIG. 2 is a right side view thereof, FIG. 3 is a front view of a front fork portion, and FIG. It is sectional drawing in alignment with the axle shaft of a front wheel.

  In FIG. 1 and FIG. 2, in this motorcycle, a pair of left and right front forks 3 are rotatably supported by a head pipe 2 provided at a front end portion of a body frame 1 and are steered by a handle 4. The lower portion of the handle 4 extends to the left and right sides of the front wheel 5 and is rotatably supported by a front wheel axle 6 spanned between the lower ends. The front wheel axle 6 is a pipe member and penetrates the hub 7 of the front wheel 5 in the left-right direction.

  The front fork 3 is a known telescopic type, and is extendable in the axial direction of the front fork 3. The front fork 3 constitutes a front wheel suspension, and repeats the expansion and contraction operation by the front wheel 5 that moves up and down depending on the road surface condition during traveling, and corresponds to a repetitive operation member of the present invention. 8 is a brake disc, 9 is a brake caliper, and the brake caliper 9 is supported on the lower portion of the front fork 3.

The vehicle body frame 1 includes a main pipe 10, a down pipe 11, a center pipe 12, and a lower pipe 13, which form a loop when viewed from the side, and an engine 14 is supported on the inside thereof. Reference numeral 15 is a radiator, and 16 is a fuel tank.
Further, the vehicle body frame 1 includes a seat rail 17 and a rear pipe 18 and supports a seat 19 on the seat rail 17. 20 is an air cleaner.

  A pivot plate 22 supports a front end portion of a rear swing arm 23 in a swingable manner on a pivot plate 21 provided near a portion where a lower end portion of the center pipe 12 and a rear end portion of the lower pipe 13 are connected. A rear wheel 25 is rotatably supported at the rear end portion of the rear swing arm 23 via a rear wheel axle 24. The rear wheel axle 24 is a pipe member.

  A rear cushion 26 is attached between the vicinity of the connection between the upper end of the rear pipe 18 and the seat rail 17 and the rear end of the rear swing arm 23. The rear swing arm 23 and the rear cushion 26 constitute a rear wheel suspension, and the rear swing arm 23 repeats the swinging motion by the rear wheel 25 that moves up and down depending on the road surface condition while traveling, and the rear cushion 26 expands and contracts while swinging. The operation is repeated and corresponds to the repetitive operation member of the present invention. The rear wheel 25 is driven by the engine 14 via the chain 27.

Reference numeral 28 denotes a change pedal, which changes the transmission via the link 29 when depressed. The change pedal 28 repeats the swinging motion by an artificial operation (stepping) during traveling, and the link 29 swings similarly. The operation unit of the change device including the change pedal 28 and the link 29 corresponds to a repetitive operation member of the present invention.

Reference numeral 30 in FIG. 2 denotes a brake pedal that is rotatably supported by a support shaft 32 on a stay 33 extending from the rear pipe 18. A lever 34 protruding from the brake pedal 30 is connected to one end of a piston rod 36 that extends downward from the lower end of the master cylinder 35. The upper end of the master cylinder 35 is swingably attached to a stay 37 extending from the rear pipe 18 so as to supply hydraulic pressure to the rear wheel brake.
The brake pedal 30 and the lever 34 repeat a swinging operation by an artificial operation (stepping) during traveling, and the piston rod 36 repeats a reciprocating operation. The operation unit of the rear wheel brake device including the brake pedal 30, the lever 34, and the piston rod 36 corresponds to a repetitive operation member of the present invention.

  Next, the structure of the air supply device for the front wheel 5 will be described. As shown in FIG. 3, the front fork 3 includes a small-diameter upper pipe 40 and a large-diameter bottom pipe 41, and the left and right upper pipes 40 are connected by a top bridge 42 and a bottom bridge 43. On either the left or right front fork 3 (bottom pipe 41), a piston type air pump 50 having a cylindrical shape on the outer side is arranged in parallel.

  The air pump 50 is a known device that creates compressed air by reciprocating the piston 52 in the cylinder 51, and sends the compressed air to the rubber hose 53. The lower end of the cylinder 51 is attached by a boss 54 to a boss 44 protruding from the bottom pipe 41 with a bolt 45. A piston rod 55 extends upward from the upper end of the cylinder 51, and a boss 56 provided at the upper end is attached to the side surface of the bottom bridge 43 by a bolt 46. The lower end of the piston rod 55 is attached to the piston 52 in the cylinder 51.

When the front wheel 5 moves up and down due to road surface unevenness or the like, the front fork 3 expands and contracts. As a result, the cylinder 51 and the piston rod 55 move relatively in the axial direction, and the piston 52 slides in the cylinder 51. , Compressed air is sent out to the rubber hose 53.
The rubber hose 53 is provided in a slack state, and the other end of the rubber hose 53 is connected to one end of the front wheel axle 6. The front wheel axle 6 is a long bolt-shaped hollow member made of a pipe member. A head 47 to which a rubber hose 53 is connected is provided at one end, and an axle nut 49 is fastened to the other end.

  The rubber hose 53 is provided adjacent to the cylinder 51 as a single body or as a separate body, and is connected to the pressure accumulation chamber 57. The pressure accumulating chamber 57 is connected to the cylinder 51 so that the compressed air produced by the cylinder 51 is stored in the pressure accumulating chamber 57.

  The front wheel 5 includes a casting wheel 60. In the casting wheel 60, the hub 7, the spoke 61 and the rim 62 are integrally formed, and a hollow tire 63 is attached to the rim 62. An axle side air chamber 64 is formed around the front wheel axle 6 inside the hub 7 (see FIG. 5). The spoke 61 is formed with an air passage 65 penetrating in the thickness direction in the thickness thereof, and a tire-side air chamber 66 is also formed between the rim 62 and the tire 63. Both ends of the spoke 61 in the length direction are connected to the hub 7 and the rim 62, and an air passage 65 communicates the axle side air chamber 64 and the tire side air chamber 66.

  Therefore, the compressed air sent from the air pump 50 to the rubber hose 53 enters the axle side air chamber 64 from the front wheel axle 6, and is further supplied to the tire side air chamber 66 through the air passage 65. The internal pressure is maintained at the same pressure as the pressure accumulation chamber 57. The air in the tire-side air chamber 66 is prevented from flowing back by maintaining the pressure accumulation chamber 57 at a high pressure, and the check valve can be omitted. However, a check valve may be provided on the rim 62 side if necessary.

  Air supply to the tire side air chamber 66 is possible at all times during traveling. When the internal pressure of the tire side air chamber 66 is low, high pressure air is supplied from the pressure accumulation chamber 57 until the reference pressure is reached. When the reference pressure is reached, the air supply to the tire-side air chamber 66 stops. The compressed air of the air pump 50 created during this pause is stored in the pressure accumulating chamber 57. Further, when the pressure in the pressure accumulating chamber 57 becomes higher than a predetermined pressure, the safety valve 59 (see FIG. 4) releases air to the atmosphere so that the internal pressure in the pressure accumulating chamber 57 is lower than the predetermined pressure.

  FIG. 4 shows the details of the pressure accumulating chamber 57 portion. The check valve 58 communicates into the cylinder 51 through the small-diameter communication passage 51 a and prevents the compressed air sent from the cylinder 51 from flowing backward from the pressure accumulation chamber 57 to the cylinder 51. The rubber hose 53 is attached to a nozzle 71 protruding to the side of the air communication joint 70, and the periphery thereof is closely fixed by caulking. The air communication joint 70 is attached by fastening an air communication bolt 73 to a screw hole 74 formed on the side surface of the pressure accumulating chamber 57 through a seal 72 made of an O-ring.

  The air communication bolt 73 has an axial hole 75 and an orthogonal hole 76 that is orthogonal to the nozzle 71. The tip end side of the axial hole 75 communicates with an intermediate portion of the communication hole 77 that penetrates the wall portion of the pressure accumulation chamber 57, and communicates with the pressure accumulation chamber 57 through the communication hole 77. A safety valve 59 is attached to the opening of the lower side wall 78 through which the communication hole 77 passes. The lower side wall portion 78 is formed so as to protrude rearward from the side surface of the cylinder 51 integrally.

FIG. 5 shows a detailed structure of the hub 7 and is a cross-sectional view of the hub 7 taken along the front wheel axle 6.
The front wheel axle 6 passes through the lower end of the hub 7 and the bottom pipe 41 disposed on the left and right sides thereof in the vehicle width direction, and a bolt head 47 that abuts against the side surface of the one bottom pipe 41 is provided at one end. The other end of the axle 6 is provided with a threaded portion and is fastened with an axle nut 49 when passing through the other bottom pipe 41. A shaft hole 48 penetrating in the length direction is formed in the shaft center portion of the shaft portion of the front wheel axle 6.
A through hole 47 a is provided in the head 47, and the rubber hose 53 connected to the head 47 communicates with the shaft hole 48 of the front wheel axle 6. The tip end side to which the axle nut 49 of the shaft hole 48 is fastened is closed. This closing is performed by sealing the tip end side with a plug or the like.

  An axle hole 80 penetrating left and right is formed in the center of the hub 7, and the front axle 6 penetrates through the axle hole 80. The axle hole 80 has an inner diameter larger than that of the front wheel axle 6, and ball bearings 81, 82 are fitted as bearings of the front wheel axle 6 to both left and right openings, respectively. A distant collar 83 is disposed in the area. A portion surrounded by the distant collar 83 and the left and right ball bearings 81 and 82 in the space in the axle hole 80 forms an axle-side air chamber 64.

  Both ends of the distance collar 83 in the length direction are in close contact with the ball bearings 81 and 82. The front wheel axle 6 passes through the shaft hole of the distance collar 83. Communication holes 84 and 85 are formed in the corresponding portions of the front wheel axle 6 and the distant collar 83 to communicate the shaft hole 48 of the front wheel axle 6 and the axle side air chamber 64. The communication holes 84 and 85 are located on the extension of the air passage 65. For this reason, even if the hub 7 rotates, the shaft holes 48 and 64 are always in communication with the air passage 65 and air supply to the tire side air chamber 66 is enabled.

  The outer sides of the ball bearings 81 and 82 are also positioned by collars 86 and 87, and seals 88 and 89 are further provided. The seals 88 and 89 are made of appropriate sealing members such as O-rings, and contact surfaces of the inner races 81 a and 82 a of the ball bearings 81 and 82 and the front wheel axle 6 and outer races 81 b and 82 b of the ball bearings 81 and 82 and the hub 7. Provided on the contact surface with the inner wall facing the axle hole 80, the ball bearings 81, 82 and the front wheel axle 6 and the hub 7 are hermetically sealed.

In this way, the inner space of the axle hole 80 between the pair of ball bearings 81 and 82 can be used as an airtight axle side air chamber 64, and the axle side air chamber 64 can be formed using the axle hole 80 of the hub 7. Easy to form.
In addition, the axle-side air chamber 64 is formed between the non-rotating front wheel axle 6 and the rotating hub 7, and can always supply air from the pressure accumulating chamber 57 through the communication holes 84 and 85, and is a spoke integrated with the hub 7. Since the axle-side air chamber 64 and the tire-side air chamber 66 are always in communication with each other through the air passage 65 formed in 61, air can be constantly supplied to the tire-side air chamber 66 of the rotating front wheel 5 (see FIG. 3). . Moreover, the supply path of the compressed air to the tire 63 can be configured easily, and the structure can be simplified.
In addition, since the ball bearings 81 and 82 are sealed by providing a lubricant around the balls, a sealed space can be formed by using the ball bearings 81 and 82, and the axle-side air chamber 64 is hermetically sealed, so that the air pump Air supply from 50 to the front wheel 5 can be realized reliably and easily.

  Further, since the front fork 3 of the front wheel suspension, which is a repetitive operation member, is used as the drive source of the air pump 50, it is not necessary to provide a high-pressure pump or compressor driven by power, and the air pump can be made compact, The fuel consumption of the vehicle can be improved. Moreover, since the piston-type air pump 50 is relatively small and lightweight, even a motorcycle with a low degree of freedom in layout can be mounted sufficiently without providing a special arrangement space.

Further, since it can be mounted on a front wheel suspension that is generally installed in a motorcycle, it is not necessary to provide a special mounting member, and the piston type air pump 50 is relatively inexpensive, and Since the entire air supply device can be configured simply, the structure is simple and inexpensive.
Effects such as compactness of the device, simplification of the structure, space saving, improvement of mounting property, and low cost are the same in the following embodiments.

  The arrangement of the air pump 50 can be changed. For example, the air pump 50 may be arranged on the center of the vehicle body in a front view. In this case, the handling of the rubber hose 53 becomes long, but a heavy cylinder 51 and the like can be arranged at the center of the vehicle body to facilitate weight balance.

6 to 8 are second to fourth embodiments in which the arrangement structure of the tire air supply device is arranged on the rear cushion 26 side constituting the rear wheel suspension.
First, FIG. 6 shows an example in which one side of a pair of left and right rear cushions 26 is attached to the inside of the rear cushion 26 in parallel and coaxially with upper and lower mounting bolts 90 and 91. The mounting bolt 90 is provided with a collar 93 between the upper mounting boss 56 of the air pump 50 and the upper boss 92 of the rear cushion 26, and similarly, the lower mounting boss 54 and the rear of the air pump 50. A collar 95 is also provided between the lower boss 94 of the cushion 26, and the rear cushion 26 and the air pump 50 are individually mounted around the mounting bolts 90 and 91 so as to be rotatable.

  In this embodiment, the path for supplying compressed air from the rubber hose 53 to the tire-side air chamber 66 and the structure of the air pump 50 are the same as in the previous embodiment (the same applies hereinafter). However, in this example, the rear wheel brake 97 is a drum type, but the airtightness of the axle side air chamber 64 is not changed. Even in this case, the air pump 50 can be provided by using the rear wheel suspension, which is a general equipment in the motorcycle.

  FIG. 7 shows a third embodiment. In this example, the upper portions of the air pump 50 and the rear cushion 26 are attached to a common bracket 100, and the boss 101 formed on the bracket 100 is attached to the vehicle body frame side by the attachment bolt 90. Installed on. The lower side is the same as in the previous embodiment. If it does in this way, attachment of an upper part side can be made easy. Note that the lower side can be formed as an integral bracket in the same manner as the upper side.

  FIG. 8 shows a fourth embodiment in which the upper and lower portions of the air pump 50 and the rear cushion 26 are separately attached to the brackets 110 and 111 on the vehicle body side, respectively. If it does in this way, it can mount, suppressing the overhang | projection dimension of a vehicle width direction, and also the change between the specification which attaches the air pump 50, and the specification which is not attached becomes easy. Reference numeral 112 denotes a rear swing arm made of a pipe member.

  9 and 10 show a fifth embodiment in which the air pump 50 is disposed in relation to the steering device. 9 is a side view of the vicinity of the head pipe 2, and FIG. 10 is a front view thereof. In the air pump 50, a ball joint 121 provided at the upper end is attached to a stay 122 protruding from the head pipe 2 with a bolt 123, and a ball joint 124 provided at the lower end is attached to the front surface of the bottom bridge 43 with a bolt 125.

  As shown in FIG. 10, when the handle 4 is rotated, the front fork 3 and the bottom bridge 43 are rotated together with the handle 4, so that the interval between the ball joints 121 and 124 is changed and the air pump 50 is expanded and contracted. Supply compressed air.

  This operation is shown on the right side of FIG. 10, where the top is a state in which the handle 4 is tilted to the left, the center is in a neutral state, and the bottom is a state in which the handle 4 is tilted to the right. As shown in this figure, the cylinder 51 of the air pump 50 is arranged with the piston rod 55 facing down. 52 is a piston of the air pump 50.

With this arrangement, the air pump 50 is in a contracted state when neutral, and the air pump 50 is in an extended state when tilting to the left and right. Therefore, generation of compressed air by the air pump 50 is repeated each time the handle 4 rotates.
Since the generation of compressed air by the air pump 50 always occurs when the handle is operated, the handle 4 can be used for driving the air pump 50 as a repetitive operation member by human operation.

  For example, the air pump 50 may be provided between the top bridge 42 or the bottom bridge 43 and the main pipe 10 or the down pipe 11 without being provided at the illustrated position.

  FIG. 11 shows a sixth embodiment using a brake lever 130 that is manually operated. In this example, the air pump 50 is disposed along the handle 4, the tip of the cylinder 51 is attached to the top bridge 42, and the tip of the piston rod 55 is extended from a brake lever 130 that is attached in advance to the handle 4. Connect to 131. The brake lever 130 is rotatable to the lever holder 132 about the rotation center axis 133.

Therefore, every time the brake lever 130 is gripped, the arm portion 131 rotates integrally with the brake lever 130, so that the piston 52 can reciprocate in a reciprocating motion to generate compressed air in the air pump 50.
If the brake pedal 30 (FIG. 2) and the air pump 50 are provided in place of the brake lever 130, compressed air can be supplied to the rear wheel 25 in conjunction with the operation of the brake pedal 30. In this way, it is possible to easily attach and operate the air pump 50 using a repetitive operation member by manual operation.

  FIG. 12 shows a seventh embodiment using a change pedal. In this example, a lever 140 that rotates integrally with the change pedal 28 is provided, and this tip is connected to one end of the piston rod 55 of the air pump 50. The cylinder 51 is disposed along the rear of the rear pipe 18 and has an upper end connected to a stay 141 that protrudes rearward from the rear pipe 18. The change pedal 28 allows the boss 142 to be pivoted to a bracket 144 extending from the rear pipe 18 by a support shaft 143. Each time the change pedal 28 is depressed and pivoted, the gear stage of the transmission is switched via the link 29. .

At the same time, since the piston rod 55 is advanced and retracted by the lever 140 that rotates integrally with the change pedal 28, compressed air is generated in the cylinder 51, and the rear wheel axle of the rear wheel 25 from a rubber hose (not shown) extending from the pressure accumulating chamber 57. 24 (see FIG. 1), and compressed air is supplied to the tire inner side of the rear wheel 25.
If it does in this way, change pedal 28 which is a repetitive operation member by manual operation can be used effectively.

The present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, a vehicle to which the present invention is applied may be a straddle type vehicle such as a scooter type vehicle as well as a saddle type motorcycle. Moreover, not only a motorcycle but also a human-powered vehicle such as a bicycle may be used.

Left side view of the motorcycle according to the first embodiment. Same side view Front view of front fork Sectional view along the axle of the front wheel Sectional view showing the detailed structure of the hub 7 The figure which shows 2nd Example The figure which shows 3rd Example The figure which shows 4th Example Side view of the vicinity of the head pipe according to the fifth embodiment Front view The figure which shows 6th Example using the brake lever 130. The figure which shows 7th Example using a change pedal.

Explanation of symbols

1: body frame, 2: head pipe, 3: front fork, 4: handle, 5: front wheel, 6: front wheel axle, 7: hub, 10: main pipe, 23: rear swing arm, 24: rear wheel axle, 25 : Rear wheel, 26: Rear cushion 2, 28: Change pedal, 50: Air pump

Claims (5)

In a tire air supply device for a motorcycle that automatically supplies air from an air pump to a tire during traveling,
It is equipped with a repetitive motion member that repetitively moves depending on the road surface condition or human operation during driving, and a piston type air pump is operated by the repetitive motion of this repetitive motion member, and the compressed air produced by this air pump is automatically applied to the tire. A tire air supply device for a two-wheeled vehicle, characterized by being supplied to the vehicle. The repetitive operation member that performs repetitive operation according to the road surface condition during traveling is a suspension member or a handle damper,
2. The tire air supply device for a motorcycle according to claim 1, wherein the repetitive operation member that performs repetitive operation by an artificial operation is an operation member of a brake, a clutch, a change, or a steering wheel. The tire for a motorcycle according to claim 1, wherein the air pump is provided on a front fork, a rear suspension, a bridge member that supports the front fork, a rear brake pedal, a rear change pedal, or a handle lever. Air supply device. Compressed air is supplied from the air pump to the front or rear axle of the pipe, and is inserted into the air chamber formed in the hub from the communication hole provided in the axle, and further formed from the air chamber to the spoke. 2. The tire air supply device for a motorcycle according to claim 1, wherein the tire air supply device is supplied into the tire through an air passage. The axle passes through the hub, and a pair of bearings is provided between the axle and the hub with an interval in the axial direction of the axle, and the air chamber is formed between the pair of bearings and the axle and the hub. ,
The tire air supply device for a motorcycle according to claim 4, wherein a seal member is provided between each of the bearings and the axle and the hub.

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