JP2006027540A - Wheel of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable mechanism not requiring supply of electricity for controlling a storage tank of air to replenish a tire concerning a wheel of an automobile. <P>SOLUTION: This wheel is furnished with an opening and closing valve 41 provided on a passage, an auxiliary passage communicated with the inside of the tire, a cylinder 43, a piston 44 connected to the opening and closing valve 41 and an elastic body 45 such as a spring to energize the piston 44, etc. The auxiliary passage 42 is connected to the cylinder 43 and energizes the piston 44 in the direction to retreat it from the cylinder 43 against energizing of the elastic body 45 by giving internal pressure of the tire between a head end of the piston 44 and the inside of the cylinder 43. The opening and closing valve 41 openably blocks the inside of the passage. The piston 44 arranges and positions the opening and closing valve 41 at a position to block the inside of the passage 3 and proceeds to the inside of the cylinder 43 and opens the passage from blocking of the opening and closing valve 41 by energizing force of the elastic body when the internal pressure of the tire is lowered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automobile foil.

Conventionally, various studies have been made on means for avoiding dangers when a tire is punctured during running of an automobile or when air in the tire is removed due to other reasons.
However, these prior arts are limited to conceptual, mere desk-top ideas and lack of concreteness.
For example, proposals typified by Patent Document 1 and Patent Document 2 have been made. In these documents, a sensor that detects a decrease in tire pressure, and a communication means that notifies the driver's seat of the detected tire pressure reduction. In the figure, a decompressed tire is provided with a cylinder for replenishing air.

JP 2003-326929 A JP-A-9-150612

In the invention described in the above document, it is assumed that an extremely precise mechanism of electronic control is used for a sensor for detecting the decompression of a tire and a means for replenishing air to the tire. As a mechanism that is installed on the tire foil that constantly receives heat, there is a great risk of disconnection due to the vibration and a short circuit, and the reliability is remarkably lacking.
Moreover, such a mechanism hinders its practical use in that it requires the supply of electricity. This point will be described in detail. For such power supply, an in-vehicle battery (a battery that an automobile is originally equipped for running and operation of safety parts, such as an alternator and a dynamo provided in the automobile) It is conceivable to use and store electricity.

As described above, if an in-vehicle battery is used to control the opening and closing of the cylinder valve, the sensor is connected to the vehicle body side and the wheel side contact (for example, “movable connector portion 7” in Patent Document 2). Further, it is necessary to supply power to a part of the communication means, and the structure becomes complicated. In other words, it may be considered that it is not difficult to transmit weak electricity such as signal transmission through the above-mentioned contact point, but for supplying power necessary for cylinder control, energization, insulation, etc. A means for preventing electric leakage (shielding) is required, and the structure becomes complicated. Such a method of supplying power is an impediment to practical use both in terms of technology and cost. Generally, in a vehicle such as an automobile, the axle and the wheel are connected via a hub, and if power is to be supplied from the vehicle body side to the wheel side, it is necessary to pass through such a hub, resulting in a complicated structure. Inevitable.
Therefore, the invention disclosed in the prior art document does not provide a practical method for supplying electricity necessary for operation as well as reliability, and is difficult to put into practical use. I cannot deny.

  SUMMARY OF THE INVENTION The present invention provides a highly reliable mechanism that does not require the supply of electricity for the control of the storage tank for the air that is replenished to the tires of a motor vehicle wheel that rotates during traveling, thereby solving the above-mentioned problems. .

The first invention of the present application is an automobile equipped with a storage tank 2 for compressed air to be replenished to the tire T, a passage 3 connecting the tank 2 and the tire T, and a control unit 4 for controlling opening and closing of the passage 3. A foil having the following configuration is provided.
That is, the control unit 4 includes an on-off valve 41 provided in the passage, a sub-passage 42 communicating with the inside of the tire, a cylinder 43, a front end side accommodated in the cylinder 43, and a rear end side connected to the on-off valve 41. A piston 44 and an elastic body 45 such as a spring that biases the piston 44 in a direction to advance the piston 44 toward the inside of the cylinder 43 are provided. The sub-passage 42 is connected to the cylinder 43 and applies the internal pressure of the tire T between the tip of the piston 44 and the inside of the cylinder 43 in a direction in which the piston 44 moves backward from the cylinder 43 against the bias of the elastic body 45. It is a force. The on-off valve 41 closes the passage 3 so that it can be opened and closed. When the internal pressure of the tire T is in a normal state, the piston 44 closes the inside of the passage 3 by the on-off valve 41, and when the internal pressure of the tire T decreases, the piston 44 is urged by the elastic body 45 to the cylinder 43. Proceeding to the inside, the passage 3 is opened from the closing of the on-off valve 41.
Here, the term “automobile” refers to a vehicle having power such as an internal combustion engine or an electric motor, and includes a motorcycle such as a motorcycle in addition to a normal four-wheel vehicle.
The above foil includes a normal foil and also includes a foil cap.

  The second invention of the present application is the first invention of the present application, wherein a bag body 46 having airtightness is accommodated between the tip of the piston 44 and the inside of the cylinder 43, and the auxiliary passage 42 is connected to the bag body 46. An automobile foil is provided.

  In the third invention of the present application, in the first or second invention of the present application, in a state where the bias of the elastic body 45 and the internal pressure of the tire T received through the sub passage 42 are balanced, the piston 44 controls the on-off valve 41. Provided is an automobile foil for closing the passage 3.

According to a fourth invention of the present application, in any one of the first to third inventions of the present application, an operation unit 5 such as a reporting device that operates by receiving supply of electricity, a generator 6, and a generator 6 are connected. When the operating unit 5 is connected to the storage battery 7 via the switch 8 and the piston 44 is in the position of closing the passage 3 by the on-off valve 41, the switch 8 When the piston 44 moves due to a decrease in tire internal pressure, the switch 8 provides a vehicle wheel that connects the operating unit 5 and the storage battery 7 to each other.
The storage battery 7 is a battery that can be charged and can be used repeatedly, and is called a secondary battery or a reversible battery.

  According to a fifth invention of the present application, there is provided an automobile foil according to any one of the first to fourth inventions of the present application, in which the generator 6 includes a solar panel and converts sunlight into electricity.

Each invention of the present application automatically supplies air to the tire from a tank provided in the wheel when the air in the tire decreases. Can be dealt with without bothering. In particular, it controls the air that is replenished from the tank using the internal pressure of the tire, and does not require the supply of electricity for the control. Therefore, there was no risk of malfunction due to concerns such as disconnection of the electric circuit even with vibration from the road surface, and sufficient reliability and safety were obtained.
In addition, by using air pressure and directly controlling the replenishment of air with a decrease in the internal pressure of the tire, it is possible to replenish air quickly without missing the machine.
Further, in the second invention of the present application, the piston is pushed back against the urging force of the elastic body by the expansion pressure of the bag body subjected to the internal pressure of the tire, and air leakage from between the piston and the cylinder due to the high pressure is prevented. , Further improved reliability.
In the third invention of the present application, in particular, when the tire internal pressure is in a normal state, the elastic body and the tire internal pressure are balanced, and if the tire internal pressure decreases even slightly, the balance immediately collapses and the The passage can be opened quickly. Therefore, it is possible to cope with a sharp decrease in the internal pressure of the tire.
In the fourth or fifth aspect of the present application, the operation unit such as an alarm device can be operated simultaneously with the operation of replenishing air to the tire. The actuating unit can generate power in the foil by a generator, does not need to receive power supply from the vehicle body side, and does not need to form a complicated electric circuit. Improved. In addition, the operation unit is operated by electricity, and the operation of the operation unit is interlocked with the operation of replenishing air against the decompression of the tire, but the replenishment of air itself is performed independently of the operation unit. Therefore, even if the operation unit does not operate due to an abnormality in the electrical system, the air is automatically replenished and is not affected by the abnormality in the electrical system. In particular, in the fifth invention of the present application, since a generator provided with a solar panel is used, the weight of the power generator and the circuit can be simplified in this respect.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the present invention. FIG. 1 is a schematic longitudinal sectional view showing a use state of a foil according to an embodiment of the present invention. FIG. 2 is an enlarged schematic vertical sectional view of a main part of FIG. 3A is an enlarged sectional view taken along line XX in FIG. 2, and FIG. 3B is an enlarged sectional view taken along line YY in FIG. FIG. 4 is an explanatory view showing a connection state of the passage and the sub passage. In FIG. 2, a configuration that does not originally appear as a cross-sectional view (a configuration of the on-off valve 41 at a position removed when the cross-section is taken and its surroundings) is also indicated by a solid line in the drawing for convenience of explanation.
In each figure, for convenience of explanation, U indicates an upper side, S indicates a lower side, R indicates an outer side direction of the vehicle body on the left and right sides of the automobile, and L indicates an inner side direction on the left and right sides of the automobile.
The wheel 1 is provided with a tire T on the outer peripheral surface and provided on an axle G of the automobile, and connects the storage tank 2 for compressed air to be replenished to the tire T, and the tank 2 and the tire T. A passage 3, a control unit 4 that controls opening and closing of the passage 3, an operation unit 5 that operates by receiving supply of electricity, a generator 6, a storage battery 7 connected to the generator 6, and a switch 8. .
Hereinafter, the configuration of each unit will be described in detail.

As shown in FIGS. 1 and 2, the foil 1 is formed in a drum shape (cylindrical shape) and includes an attachment portion 10. The attachment portion 10 connects the wheel 1 and the axle G. The mounting portion 2 is a well-known fixing structure portion around the hub on the wheel side and the hub in a normal vehicle. The mounting portion 10 is provided on the rear surface 1b side of the wheel 1 (the side on which the vehicle body is desired, that is, the end surface in which the inner direction L is desired), and is fixed to the axle G by bolting.
In this embodiment, the tank 2, a part of the passage 3, the control unit 4, the operation unit 5, the generator 6, the storage battery 7, and the switch 8 are provided in the housing 11. As a unit, the unit is provided at the center of the foil 1 on the surface 1a side. The housing 11 is fixed to the foil 1 by a known means such as bolting, and is integrated with the foil 1 as a part of the foil 1.
In the center of the surface 1a of the foil 1, a recess that recedes toward the axle G is formed as the housing portion 1c of the housing 11. The housing 11 can be accommodated in the accommodating portion 1c so as not to protrude from the surface 1a of the foil 1.
The housing 11 is preferably formed of a light metal such as aluminum. However, it is not limited to such materials.
In addition, at the time of manufacturing the foil 1, the housing 11 can be formed integrally with the foil 1 from the beginning.

In this embodiment, in the housing 11, the storage battery 7, the operating unit 5, the control unit 4, and the tank 2 are arranged in this order from the vehicle body side (inside L) to the outside (outside R). In this embodiment, the generator 6 is a solar panel and converts sunlight into electricity. Therefore, the housing 11 is provided on the surface of the housing 11 so that sunlight can be received. It is preferable to cover the solar panel (generator 6) with a cover 12 having translucency such as a wire mesh or a punching plate shown in FIGS. 1 and 2 so as not to be damaged by hitting a stone or the like during traveling.
The generator 6 is electrically connected to the storage battery 7 through a conductive wire 60. The electricity generated by the generator 6 in response to sunlight is stored in the storage battery 7.
The tank 2 is a storage chamber (air cylinder) that can store compressed air. That is, the tank 2 is a room defined in the housing 11 from other parts in the housing 11. Since the tank 2 contains compressed air, the tank 2 preferably has a pressure resistance of about 7 kg or more. In order to secure such high-pressure air, it is preferable that the partition wall 20 is divided into a plurality of rooms 2a... 2a as shown in FIG. In this embodiment, the tank 20 is divided into four rooms 2a... 2a by partition walls 20. However, it is not limited to such a number and can be changed. Each room 2a ... a communicates with a communication hole 21 ... 21.
The housing 11 is provided with an inlet 22 (valve) for filling the tank 20 with compressed air from the outside of the housing 11. Reference numeral 23 denotes a cap that closes the inlet 22 when not in use.
Further, in the tank 20, a wiring hole 24 through which the conductive wire 60 connecting the generator 6 and the storage battery 7 is passed is formed. In FIG. 3A, the lead wire 60 connecting the generator 6 and the storage battery 7 is omitted in order to avoid the complexity of the drawing.

As shown in FIGS. 2 to 4, the control unit 4 includes an on-off valve 41 provided in the passage 3, a sub-passage 42 that communicates with the inside of the tire, a cylinder 43, and a tip side that is accommodated in the cylinder 43. A piston 44 whose end side is connected to the opening / closing valve 41, an elastic body 45 such as a spring that urges the piston 44 in a direction to advance toward the inside of the cylinder 43, and a bag body 46 disposed in the cylinder 43. .
The piston 44, the cylinder 43, the on-off valve 41, and the passage 3 and a part of the sub-passage 42 are disposed between the tank 6 and the storage battery 7 in the housing 11. However, such an arrangement can be changed.
The cylinder 43 is fixed to the housing 11 by a support portion 43 a and is integrated with the housing 11.

The on-off valve 41 is a valve mechanism provided in the passage 3 in the housing 11. In this embodiment, the on-off valve 41 is fixed inside the housing 11. The on-off valve 41 includes a valve body provided in the passage 3 and an operation rod 41a that can be operated outside the passage 3, and the position or orientation of the valve body is changed by operating the operation rod 41a. The passage 3 can be opened and closed. As the on-off valve 41, a known valve mechanism such as a ball valve can be adopted.
In this embodiment, a ball valve is employed as the on-off valve 41. The valve body of the ball valve is a ball having a through-hole penetrating from a part of the surface to another part of the surface (not shown), and is interposed in the middle of the passage 3 to block the passage. The through hole is provided at a position off the center of the ball. The tip of the operation rod 41a is attached to the ball, and by swinging the operation rod 41a, the direction of the ball can be changed and the through hole can be directed to coincide with the passage 3. In this state, the front and rear sections of the passage 3 separated by the ball communicate with each other through the through-hole, and air can pass through the passage 3 (the ball releases the closure of the passage 3 and passes through the passage 3). Open).
As described above, the air in the passage 3 can pass through the through hole, so that the air in the tank 2 can be guided to the tire T side (the compressed air in the tank 2 is introduced into the tire T). Can be released).

  The piston 44 includes a head portion 44a and a shaft portion 44b provided at the rear end of the head portion 44a. The base end of the shaft portion 44b is fixed to the rear end of the head portion 44a, and the tip end side of the shaft portion 44b extends rearward (upward in FIG. 3A) from the head portion 44a. The cylinder 43 is a cylindrical body whose both ends are closed. The tip of the cylinder 43 is closed at the bottom 43b, and the rear end of the cylinder 43 is closed at the top 43c. The piston 44 is accommodated in the cylinder 43 so that the tip of the head 44 a of the piston 44 faces the bottom 43 b of the cylinder 43. A through portion that communicates the inside and outside of the cylinder 43 is formed in the top portion 43 c of the cylinder 43, and the tip of the shaft portion 44 a of the piston 44 is exposed to the outside of the cylinder 43 from the through portion.

In the cylinder 43, an elastic body 45 is disposed between the top portion 43 c of the cylinder 43 and the rear end surface of the head portion 44 a of the piston 44. The elastic body 45 biases the head 44 a of the piston 44 toward the bottom 43 b of the cylinder 43. In the cylinder 43, the bag body 46 is accommodated between the bottom 43 b of the cylinder 43 and the tip surface of the head 44 a of the piston 44. The bag body 46 has airtightness made of plastic having flexibility such as vinyl or polyethylene. A through-hole that communicates the inside and outside of the cylinder 43 is formed in the bottom 43b of the cylinder 43, and the auxiliary passage 42 is connected to the bag body 46 through the through-hole.
Since the bag body 46 (and between the cylinder 43 and the piston 44 head 44a) receives the internal pressure of the tire T, a bag body having a strength that can withstand such an internal pressure is adopted. Specifically, those having pressure resistance that can withstand 1.4 to 2.2 atmospheres are preferable.

  A sliding rod 44 c is provided at the rear end of the shaft portion 44 b of the piston 44. The sliding rod 44c is integrated with the shaft portion 44b of the piston 44, and slides back and forth (up and down in FIG. 3A) as the piston 44 advances and retreats. Specifically, the rear end of the operating rod 41a of the on-off valve 41 (ball valve) is connected to the sliding rod 44c via a hinge 41b. The hinge 41b is a joint that links the sliding rod 44c so that the direction of the operating rod 41 can be changed. As the sliding rod 44c slides, the operating rod 41a swings, changes the direction of the valve body (ball), and opens and closes the passage 3.

  As described above, the auxiliary passage 42 is connected to the bag body 46 disposed between the cylinder 43 and the piston 44 head 44a. The bag body 46 swells due to the internal pressure of the tire T, and urges the piston 44 in a direction (upward in FIG. 3A) to retreat the piston 44 against the urging force of the elastic body 45. That is, the auxiliary passage 42 applies the internal pressure of the tire T between the tip of the piston 44 and the inside of the cylinder 43 and urges the piston 44 in the direction in which the piston 44 moves backward from the cylinder 43 against the urging of the elastic body 45. is there. In the above, it is also possible to connect the auxiliary passage 42 directly between the cylinder 43 and the piston 44 head 44a without providing the bag body 46. However, in order to ensure airtightness between the piston 44 and the cylinder 43 against the internal pressure of the tire T, it is preferable to indirectly bias the piston 44 via the bag 46.

  As described above, one end of the passage 3 and the sub passage 42 is connected to the tire T, and the other end passes through the inside of the foil 1 as shown in FIGS. 1 and 2, and the tank 2 in the housing 11. And the cylinder 43 (bag 46). The passage 3 and the sub passage 42 are both metal pipes. For the convenience of attaching / detaching the housing 11 to / from the foil 1, the sections in the housing 11 and the other sections of the passage 3 and the sub-passage 42 are formed separately, and the housing 11 is attached to the foil 1. In addition, it is preferable that both sections are connected by a known connection means. Such connecting means is not shown in order to avoid complication of the drawing.

The operating unit 5 is a device that operates by receiving supply of electricity. In this embodiment, the operation unit 5 is a notification device that notifies the driver's seat that the tire is depressurized or that the tire is refilled with air in response to the tire depressurization. Specifically, in this embodiment, the operating unit 5 is a transmitter that transmits a report to a receiver provided in the driver's seat.
As shown in FIG. 3A, the operating unit 5 is electrically connected to the storage battery 7 via the switch 8. Specifically, in this embodiment, the operation unit 5 operates upon receiving a direct current. Specifically, the corresponding pole of the operating unit 5 is directly connected to either positive or negative pole of the storage battery 7, and the other pole with respect to the positive or negative of the storage battery, and the pole of the operating unit 5 corresponding to the other pole Are connected via the switch 8. The switch 8 includes a contact 81 that is electrically connected to the storage battery 7 and a contact 82 that is electrically connected to the operating portion 5 side. When the two contacts 81 and 82 come into contact with each other, the switch 8 is energized and supplies electricity from the storage battery 7 to the operating unit 5. One of the contacts 81 and 82 (here, the contact 82) is attached to the sliding rod 44c, and the other of the contacts 82 and 82 (here, the contact 81) is fixed to the housing 11. The switch 8 is turned on and off by sliding the sliding rod 44c.

  In the above, when the internal pressure of the tire T is in a normal state, the pressure of the elastic body 45 and the internal pressure of the tire T are balanced. That is, when the internal pressure of the tire T is normal, the pressing force of the elastic body 45 and the pressing force due to the expansion of the bag body 46 are balanced, and the piston 44 (sliding rod 44c) is linked to the sliding rod 44c. The operating rod 41a is stopped at the position where the valve body is closed. Thus, when the internal pressure of the tire T is in a normal state, the piston 44 is set to be balanced (still) at a predetermined position. When the internal pressure of the tire T decreases and the above balance is lost, the piston 44 advances into the cylinder 43 by the urging of the elastic body 45, and the bag body 46 contracts. Then, due to the sliding of the sliding rod 44c due to the advancement of the piston 44, the operating rod 41a linked to the sliding rod 44c swings, changes the direction of the valve body, unlocks the passage 3, The passage 3 is opened. On the other hand, both the contacts 81 and 82 of the switch 8 come into contact with each other by the sliding of the sliding rod 44c, and the operating portion 5 operates. That is, the switch 8 is turned on, and the operating unit 8 notifies the driver's seat of tire pressure reduction.

As described above, when the passage 3 is opened, the air in the tank 2 is sent into the tire T, and the air is replenished.
When the internal pressure of the tire T is restored by the replenishment of air, the bag body 46 expands again, pushes back the piston 44 (retracts the piston 44), and slides the sliding rod 44c in the direction opposite to that during decompression. The piston 44 is balanced (stationary) at the initial normal position. By this restoring operation, the sliding rod 44c returns to the initial normal position, and the operating rod 41a returns the valve body to the position where the passage 3 is closed. The switch 8 returns to the off state, and the operating unit 5 stops reporting.

  In the above embodiment, the generator 6 is a solar panel. In addition, it is also possible to employ a generator other than such a solar. Hereinafter, such an embodiment will be described with reference to FIG. In the embodiment shown in FIG. 5, the components other than those particularly mentioned are the same as those in the embodiment shown in FIGS.

In this embodiment, the generator 5 is disposed in the housing 11 between the control unit 4 and the storage battery 7 in the embodiment shown in FIGS.
The generator 5 is disposed concentrically with the center of the foil 1. The generator 6 includes an outer portion 61 and a core portion 62, and is arranged so that the outer portion 61 surrounds the core portion 62, and the core portion 62 (rotor) with respect to the outer portion 61 (stator). A well-known device (DC machine) that generates electricity by rotating relatively is adopted. As this generator 6, a known generator that generates electricity by power generation at the outer portion 62 is employed. That is, the generator 6 is a brushless type, and the outer portion 61 includes an exciting yoke, an armature core, an armature winding, and an exciting winding, and the core portion 62 projects from the exciting yoke. And a pole portion. As this type of generator 5, for example, the generators disclosed in JP-A-15-79117, JP-A-15-134766, JP-A-15-204661, and JP-A-11-332190 can be employed.
The outer portion 61 is electrically connected to the storage battery 7. The core 62 is fixed to the outer shell 61 via a bearing 63. The core part 62 is provided with a weight 64. The weight 64 has a biased weight in the circumferential direction of the core portion 62. The outer portion 61 is fixed to the foil 1. At the time of rotation of the wheel 1 by the traveling of the automobile, the outer portion 61 rotates together with the foil 1, but the core portion 62 stops rotating with respect to the outer portion 61 by the weight 64 without following the rotation of the outer portion 61. As a result, the outer portion 61 rotates relative to the core portion 62 and power is generated (contrast to the conventional generator, the outer portion 61 that is a stator rotates relative to the core portion 62 that is a rotor. Power is generated.) The inventor of the present application has filed an application on March 29, 2004 for performing power generation by rotating the outer section 62 without rotating the core section 62 (Japanese Patent Application No. 2004-93929). The generator which concerns on invention can be employ | adopted as the said generator 6. FIG.
The generator 6 shown in FIGS. 1 to 4 and the generator 6 shown in FIG. 5 may be provided side by side.

It is a schematic longitudinal cross-sectional view which shows the use condition of one Embodiment of the foil which concerns on this invention. It is a principal part expanded schematic sectional drawing of the foil shown in FIG. (A) is XX sectional drawing of FIG. 2, (B) is YY sectional drawing of FIG. It is explanatory drawing of the said foil. It is a principal part expansion schematic sectional drawing of the foil which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel 2 Tank 3 Passage 4 Control part 5 Actuation part 6 Generator 7 Storage battery 41 On-off valve 42 Sub-passage 43 Cylinder 44 Piston 45 Elastic body 46 Bag body

Claims (5)

In a wheel of an automobile provided with a storage tank for compressed air to be replenished to a tire, a passage connecting the tank and the tire, and a controller for controlling opening and closing of the passage,
The control unit includes an on-off valve provided in the passage, a sub-passage communicating with the inside of the tire, a cylinder, a piston having a front end side accommodated in the cylinder and a rear end side connected to the on-off valve, and the piston into the cylinder. An elastic body such as a spring that urges in a direction to advance toward the
The auxiliary passage is connected to the cylinder, applies the tire internal pressure between the piston tip and the inside of the cylinder, and urges the piston in a direction to move the piston backward from the cylinder against the urging of the elastic body.
The on-off valve closes the passage so that it can be opened and closed.
When the internal pressure of the tire is normal, the piston closes the passage with an on-off valve, and when the internal pressure of the tire decreases, the piston advances to the inside of the cylinder by the urging of the elastic body, An automobile foil characterized in that the passage is opened from closing.   2. The vehicle wheel according to claim 1, wherein a bag body having airtightness is accommodated between the piston tip and the inside of the cylinder, and a secondary passage is connected to the bag body.   3. The vehicle according to claim 1, wherein the piston is configured to close the passage in a state where the urging force of the elastic body and the tire internal pressure received through the sub passage are balanced. foil. It has an operating part such as a reporting device that operates by receiving supply of electricity, a generator, and a storage battery connected to the generator,
The operating unit is connected to the storage battery via a switch,
When the piston is in a position to close the passage by the on-off valve, the switch disconnects the operating unit and the storage battery, and the switch moves between the operating unit and the piston when the tire internal pressure decreases. 4. The vehicle wheel according to claim 1, wherein the vehicle battery is connected to a storage battery.   The motor vehicle wheel according to any one of claims 1 to 4, wherein the generator includes a solar panel and converts sunlight into electricity.

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