JP2022104167A - Tire measurement device and pneumatic tire - Google Patents

Abstract

To provide a tire measurement device and a pneumatic tire that are satisfactory in workability in separating a tire body and a wheel.SOLUTION: A tire measurement device 3 includes: a sensor 31 disposed on a tire inner cavity surface 14a of a pneumatic tire 1; and a relay 32 and a power source 33, disposed on an outer peripheral surface 23a of a wheel. With respect to a range of a predetermined angle within ±90° in an opposite direction of the sensor 31 as viewed from the rotational axis of the tire, the relay 32 and the power source 33 are disposed outside the range of the predetermined angle.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tire measuring device and a pneumatic tire attached to a pneumatic tire.

Pneumatic tires mounted on vehicles are equipped with various sensors and a power source for supplying electric power to the sensors for estimating tire wear and the like.

Patent Document 1 describes a tire condition measuring device that is arranged inside a tire of a vehicle and attached to a wheel of the vehicle. The tire condition measuring device includes a support portion extending along the circumferential direction on the outer peripheral surface of the wheel and sandwiching the outer peripheral surface of the wheel, and a measuring unit attached to the support portion to measure the tire condition.

Japanese Unexamined Patent Publication No. 2018-176817

In the tire condition measuring device described in Patent Document 1, it is described that one measuring unit is attached to a support unit. By the way, when the tire measuring device is composed of a plurality of separate devices arranged in the tire and is electrically connected to each other by wiring to function, the inventor needs to devise the arrangement of each device. Noticed. That is, when a plurality of devices are arranged in the tire, the workability of separation at the time of recombination of the tire body and the wheel is significantly impaired depending on the arrangement method, and problems such as disconnection of wiring with a tool occur. Is a concern.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a tire measuring device and a pneumatic tire having good workability for separating a tire body and a wheel.

One aspect of the present invention is a tire measuring device. The tire measuring device is a tire measuring device including a sensor disposed on the tire cavity surface of a pneumatic tire and a repeater and a power supply disposed on the outer peripheral surface of the wheel. It is characterized in that the tire is arranged outside the predetermined angle range with respect to the predetermined angle range within ± 90 ° in the direction opposite to the sensor when viewed from the tire rotation axis.

Another aspect of the invention is a pneumatic tire. The pneumatic tire includes a tire body, a wheel for fitting the tire body, a sensor disposed on the tire inner surface surface of the tire body, and a repeater and a power supply arranged on the outer peripheral surface of the wheel. In the pneumatic tire provided, the repeater and the power supply are arranged outside the predetermined angle range with respect to a predetermined angle range within ± 90 ° in the direction opposite to the sensor when viewed from the tire rotation axis. It is characterized by that.

According to the present invention, the workability of separating the tire body and the wheel is good.

It is a side view of the pneumatic tire which arranged the tire measuring apparatus which concerns on embodiment. It is sectional drawing of the pneumatic tire by the line AA shown in FIG. It is a perspective view which shows the appearance of a repeater and a power source. It is sectional drawing which includes the tire circumferential direction of a repeater and a power source. It is a schematic diagram for demonstrating the arrangement of a tire measuring apparatus. It is a schematic diagram for demonstrating the separation work of a tire body and a wheel. It is a schematic diagram for demonstrating the arrangement of the tire measuring apparatus which concerns on a modification. It is a schematic diagram for demonstrating the arrangement of the tire measuring apparatus which concerns on another modification.

Hereinafter, the present invention will be described with reference to FIGS. 1 to 8 based on a preferred embodiment. The same or equivalent components and members shown in the drawings shall be designated by the same reference numerals, and duplicate description thereof will be omitted as appropriate. Further, the dimensions of the members in each drawing are shown in an appropriately enlarged or reduced size for easy understanding. In addition, some of the members that are not important for explaining the embodiment in each drawing are omitted and displayed.

(Embodiment)
FIG. 1 is a side view of the pneumatic tire 1 in which the tire measuring device 3 according to the embodiment is arranged, and FIG. 2 is a cross-sectional view of the pneumatic tire 1 taken along the line AA shown in FIG. The pneumatic tire 1 includes a tire body 10, a wheel 20, and a tire measuring device 3. The tire measuring device 3 has a sensor 31, a repeater 32, and a power supply 33, and transmits the physical information of the tire 1 measured by the sensor 31 from the repeater 32 to the outside.

The sensor 31 is, for example, an acceleration sensor, a strain sensor, a pressure sensor, a temperature sensor, or the like, and measures a physical quantity in the pneumatic tire 1. The repeater 32 transmits the data measured by the sensor 31 to an external device based on a wireless communication method such as WiFi (registered trademark). The power supply 33 has a battery such as a lithium ion battery, and supplies electric power to the sensor 31 and the repeater 32. The power supply 33 may include a rechargeable battery and may be supplied with power from the outside of the pneumatic tire 1.

The sensor 31 is attached to the tire lumen surface 14a surrounding the tire lumen 14 in the tire body 10. The tire lumen surface 14a is an inner surface facing the tire lumen 14 side of the tread portion 11, the side portion 12 and the bead portion 13, which will be described later. In the present embodiment, the sensor 31 is attached to the inner surface of the tread portion 11a of the tire lumen surface 14a facing the tire lumen 14 of the tread portion 11, but is attached to the inner surface of the side portion 12 and the bead portion 13. You may be. Further, the repeater 32 and the power supply 33 are attached to the outer peripheral surface 23a of the wheel 20. By providing the repeater 32 and the power supply 33 in the recess 26 formed in the body portion 24 of the rim portion 23 described later, the protrusion to the outside in the tire radial direction is suppressed. Further, it is preferable that the sensor 31, the repeater 32 and the power supply 33 are arranged in the central portion in the tire width direction so as not to interfere with tools or the like when the tire body 10 and the wheel 20 are recombined.

With reference to FIG. 2, the tire body 10 is provided with side portions 12 continuously at both ends in the axial direction (tire width direction) of the tread portion 11, and corresponds to the rim end portion 25 on the wheel 20 side of the side portion 12. A bead portion 13 is formed at the position.

A wheel 20 is fitted in the center of the tire body 10. The wheel 20 is provided so that the disc portion 22 extends radially around the cylindrical hub portion 21 connecting the axles. The disk portion 22 supports a cylindrical rim portion 23 connected to the outer peripheral edge.

The rim portion 23 has rim end portions 25 on both sides of the body portion 24 in the tire width direction. The rim end portions 25 are provided so as to bend and extend toward the outer side in the radial direction toward the outer side in the tire width direction. The bead portion 13 of the tire body 10 is fitted to the rim end portion 25.

In the body portion 24 between the rim end portions 25, a recess 26 is formed in the central portion in the tire width direction over the entire circumference so as to pierce the center side in the radial direction. By providing the recess 26 in the body portion 24 of the wheel 20, the rim portion 23 can be made highly rigid and lightweight. The recess 26 may not be provided, and in this case, the outer peripheral surface 24a of the body portion 24 is formed flat in the tire width direction.

The outer peripheral surface 23a of the rim portion 23 includes the outer peripheral surface 24a of the body portion 24 and the bottom surface 26a of the recess 26. The repeater 32 and the power supply 33 are attached to the bottom surface 26a of the recess 26 in the outer peripheral surface 23a. The repeater 32 and the power supply 33 may be attached to a portion of the outer peripheral surface 23a other than the bottom surface 26a, and when the recess 26 is not provided, the outer peripheral surface becomes flat in the tire width direction. It can be attached to any position on 24a.

FIG. 3 is a perspective view showing the appearance of the repeater 32 and the power supply 33. The repeater 32 and the power supply 33 may be the same or different in shape and size. Here, the repeater 32 will be described as an example, but the same applies to the power supply 33. The repeater 32 is fixed to the fixing portion 40 by using an adhesive or a fastener 34. Further, the repeater 32 may be integrally formed with the fixed portion 40.

The fixing portion 40 has a base portion 41 and a leg portion 42. The legs 42 have a plate shape and are provided at both ends of the base 41 in the tire circumferential direction. The leg portion 42 is attached to the outer peripheral surface 23a of the rim portion 23 of the wheel 20 with double-sided tape or the like.

The leg portion 42 has a through hole portion 43 penetrating in the tire circumferential direction. In the present embodiment, in each leg portion 42, two through-hole portions 43 are provided side by side in the tire width direction. The cross section of the through hole portion 43 orthogonal to the tire circumferential direction has a rectangular shape with the tire radial direction as the lateral direction.

FIG. 4 is a cross-sectional view including the circumferential direction of the repeater 32 and the power supply 33. FIG. 4 shows a cross section cut at the position of the through hole portion 43. A band 50 is inserted through a through hole 43 provided in the leg 42. In this embodiment, the two bands 50 are used side by side in the tire width direction. The band 50 is inserted through the corresponding through hole 43 of each leg 42 at the same position in the tire width direction. In FIG. 4, the internal configuration of the repeater 32 is not shown.

The band 50 is wound along the outer peripheral surface 23a (including the bottom surface 26a) of the rim portion 23, and both ends thereof are connected by a fastener 51 and wound around the outer peripheral surface 23a. As the fastener 51, various known types such as a ratchet type that pulls in and tightens the end portion of the band 50 by a ratchet lever can be used.

The repeater 32 and the power supply 33 can be fastened together with the outer peripheral surface 23a of the rim portion 23 by the band 50, and it is possible to suppress an increase in the number of parts for fixing the repeater 32 and the power supply 33.

Returning to FIG. 3, a terminal portion 32a is provided on the side surface of the repeater 32. The terminal portion 32a is electrically connected to the sensor 31 and the power supply 33 by the connected wiring 70. In order to attach / detach the wiring 70, for example, the terminal portion 32a may be a pin connector, and a socket connector may be attached to the end portion of the wiring 70 to electrically connect the wiring 70.

Further, the end portion of the wiring 70 may be connected to the terminal portion 32a by soldering or the like. The end portion and the terminal portion 32a of the wiring 70 may be molded with a resin or the like, and the resin may be adhered to and fixed to the side surface of the repeater 32. The wiring 70 may be configured to be detachable by attaching a connector to at least one of both ends. Further, the wiring 70 may have a connector in the middle and be detachable.

FIG. 5 is a schematic diagram for explaining the arrangement of the tire measuring device 3. FIG. 5 shows a cross section orthogonal to the tire rotation axis R. As described above, the sensor 31 is attached to the tire lumen surface 14a (in this embodiment, the inner surface 11a of the tread portion), and the repeater 32 and the power supply 33 are attached to the outer peripheral surface 23a of the wheel 20.

At least one of the repeater 32 and the power supply 33 is arranged within a range S of ± 90 ° in the direction Q opposite to the sensor 31 when viewed from the tire rotation axis R. In the example shown in FIG. 5, both the repeater 32 and the power supply 33 are arranged within the range S.

The repeater 32 and the power supply 33 are arranged outside the range S1 of a predetermined angle within the angle range S. The angle of the range S1 is, for example, 120 °. The range S1 may be a range sandwiched between boundaries B1 and B2 having the same angle on both sides of the opposite direction Q.

As will be described later, the range S1 includes a range in which the lever tool used for separating the tire body 10 from the wheel 20 is pressed against the side portion 12 of the tire body 10 when the tire body 10 and the wheel 20 are recombined. is doing.

The wiring 70 is composed of a wiring 70a between the sensor 31 and the repeater 32, a wiring 70b between the sensor 31 and the power supply 33, and a wiring 70c between the repeater 32 and the power supply 33. When a common power supply line is provided for the sensor 31 and the repeater 32, one of the wiring 70b between the sensor 31 and the power supply 33 and the wiring 70c between the repeater 32 and the power supply 33 can be omitted.

The wiring 70a and the wiring 70b are connected between the sensor 31, the repeater 32, and the power supply 33, and are routed in the air in the tire lumen 14. The wiring 70c is arranged between the repeater 32 and the power supply 33 along the outer peripheral surface 23a of the rim portion 23. Further, the wiring 70a, the wiring 70b, and the wiring 70c are arranged in the central portion in the tire width direction.

Next, the operation of the pneumatic tire 1 will be described. FIG. 6 is a schematic diagram for explaining the separation work of the tire body 10 and the wheel 20. When the tire body 10 is separated from the wheel 20, the lever tool 80 is pressed against the bead portion 13 and the side portion 12 and pushed in the tire axial direction to remove the bead portion 13 from the rim end portion 25 of the wheel 20.

The tip portion 81 of the lever tool 80 is formed in a plate shape having an outer shape such as a fan shape. The tip portion 81 comes into contact with the bead portion 13 and the side portion 12 within the range of the plate surface of the tip portion 81, and is pushed in the tire axial direction. By pushing the tip portion 81 within the range S1 of the predetermined angle shown in FIG. 5, the tip portion 81 can be pushed in without contacting the sensor 31, the repeater 32, the power supply 33, the wiring 70a, the wiring 70b, and the wiring 70c.

Further, when the lever tool 80 makes a round in the circumferential direction along one rim end 25 of the wheel 20 with the tip 81 pushed in, the sensor 31 and the relay arranged in the central portion in the tire width direction are relayed. Do not contact the device 32, the power supply 33, the wiring 70a, the wiring 70b and the wiring 70c.

As described above, since the tire measuring device 3 is arranged at a position where it does not come into contact with the lever tool 80, the workability of separating the tire body 10 and the wheel 20 is improved. By setting the angle of the range S1 to, for example, 120 °, the range in which the lever tool 80 is pushed can be sufficiently included.

Further, in the tire measuring device 3, the repeater 32 and the power supply 33 are arranged within the angle range S (see FIG. 5), so that the weight imbalance caused by the sensor 31, the repeater 32 and the power supply 33 can be suppressed. ..

Further, the range S1 is a range sandwiched between the boundaries B1 and B2 having the same angle on both sides of the opposite direction Q. As a result, the tire measuring device 3 can arrange the repeater 32 and the power supply 33 at positions symmetrical with respect to the opposite direction Q outside the range S1.

(Modification example)
FIG. 7 is a schematic diagram for explaining the arrangement of the tire measuring device 3 according to the modified example. As shown in FIG. 7, the range S1 may define the boundaries B1 and B2 at different angles on both sides of the opposite direction Q. Also in this case, the lever tool 80 can be pushed into the bead portion 13 and the side portion 12 in the range S1 to separate the tire body 10 and the wheel 20.

FIG. 8 is a schematic diagram for explaining the arrangement of the tire measuring device 3 according to another modification. As shown in FIG. 8, one of the repeater 32 and the power supply 33 of the tire measuring device 3 may be arranged within the range S, and the other may be arranged outside the range S, or both. The weight imbalance can be suppressed as compared with the configuration in which the tires are arranged outside the range S.

Next, the features of the tire measuring device 3 and the pneumatic tire 1 according to the embodiment and the modified example will be described.
The tire measuring device 3 includes a sensor 31 disposed on the tire lumen surface 14a of the pneumatic tire 1, a repeater 32 disposed on the outer peripheral surface 23a of the wheel 20, and a power supply 33. The repeater 32 and the power supply 33 are arranged outside the predetermined angle range with respect to a predetermined angle range within ± 90 ° in the direction opposite to the sensor 31 when viewed from the tire rotation axis. As a result, the tire measuring device 3 is arranged so as not to come into contact with the lever tool 80, so that the workability of separating the tire body 10 and the wheel 20 is improved.

Further, at least one of the repeater 32 and the power supply 33 is arranged within ± 90 ° in the direction opposite to the sensor 31 when viewed from the tire rotation axis. As a result, the tire measuring device 3 can suppress the weight imbalance caused by the sensor 31, the repeater 32, and the power supply 33.

Further, the range of a predetermined angle is a range sandwiched by boundaries of the same angle on both sides in the direction opposite to the sensor 31 when viewed from the tire rotation axis. As a result, the tire measuring device 3 can arrange the repeater 32 and the power supply 33 at positions symmetrical with respect to the direction opposite to the sensor 31 when viewed from the tire rotation axis.

The predetermined angle range is 120 °. As a result, the tire measuring device 3 can sufficiently include the range in which the lever tool 80 is pushed.

Further, the repeater 32 and the power supply 33 are co-tightened by a band 50 wound around the outer peripheral surface 23a and fixed to the wheel. As a result, the tire measuring device 3 can suppress an increase in the number of parts for fixing the repeater 32 and the power supply 33.

The pneumatic tire 1 includes a tire body 10, a wheel 20 for fitting the tire body 10, a sensor 31 disposed on the tire lumen surface 14a of the tire body 10, and a relay arranged on the outer peripheral surface 23a of the wheel 20. A device 32 and a power supply 33 are provided. The repeater 32 and the power supply 33 are arranged outside the predetermined angle range with respect to a predetermined angle range within ± 90 ° in the direction opposite to the sensor 31 when viewed from the tire rotation axis. As a result, the pneumatic tire 1 has good workability for separating the tire body 10 and the wheel 20.

The above description has been made based on the embodiment of the present invention. It will be appreciated by those skilled in the art that these embodiments are exemplary and that various modifications and modifications are possible within the claims of the invention and that such modifications and modifications are also within the claims of the present invention. It is about to be done. Therefore, the descriptions and drawings herein should be treated as exemplary rather than limiting.

1 Pneumatic tire, 10 Tire body, 14a Tire lumen surface,
20 wheels, 23a outer peripheral surface, 3 tire measuring device,
31 sensors, 32 repeaters, 33 power supplies, 50 bands.

Claims (6)

Sensors placed on the tire lumen surface of pneumatic tires,
The repeater and power supply arranged on the outer peripheral surface of the wheel,
In a tire measuring device equipped with
The tire is characterized in that the repeater and the power supply are arranged outside the predetermined angle range with respect to a predetermined angle range within ± 90 ° in the direction opposite to the sensor when viewed from the tire rotation axis. Measuring device. The tire measuring device according to claim 1, wherein at least one of the repeater and the power supply is arranged within ± 90 ° in the direction opposite to the sensor when viewed from the tire rotation axis. The tire measuring device according to claim 1 or 2, wherein the range of the predetermined angle is a range sandwiched by boundaries of the same angle on both sides in the direction opposite to the sensor when viewed from the tire rotation axis. The tire measuring device according to any one of claims 1 to 3, wherein the predetermined angle range is 120 °. The tire measuring device according to any one of claims 1 to 4, wherein the repeater and the power supply are co-tightened by a band wound around the outer peripheral surface and fixed to the wheel. In a pneumatic tire comprising a tire body, a wheel into which the tire body is fitted, a sensor disposed on the tire cavity surface of the tire body, and a repeater and a power source disposed on the outer peripheral surface of the wheel. ,
The repeater and the power supply are arranged outside the predetermined angle range with respect to a predetermined angle range within ± 90 ° in the direction opposite to the sensor when viewed from the tire rotation axis. Tires with tires.

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