US-12618669-B2 - Tire sensor and tire

US12618669B2US 12618669 B2US12618669 B2US 12618669B2US-12618669-B2

Abstract

A tire sensor according to the present disclosure is a tire sensor configured to be mountable on a tire inner surface. The tire sensor includes a sensor body including electronic circuitry including a detector configured to be able to detect tire information, and a cover body configured to cover at least a part of a periphery of the sensor body. The cover body includes a mounting surface configured to be mountable on the tire inner surface, and a side surface configured to rise from an outer edge of the mounting surface. In the side surface of the cover body, a concave portion is formed between the mounting surface and a height position of ¼ of a maximum sensor height in a sensor height direction orthogonal to the mounting surface.

Inventors

Shigeru Yamaguchi

Assignees

BRIDGESTONE CORPORATION

Dates

Publication Date: 20260505
Application Date: 20220607
Priority Date: 20210901

Claims (9)

1 . A tire sensor configured to be mountable on a tire inner surface, the tire sensor comprising: a sensor body comprising electronic circuitry comprising a detector configured to be able to detect tire information; and a cover body configured to cover at least a part of a periphery of the sensor body, wherein the cover body comprises: a mounting surface configured to be mountable on the tire inner surface; and a side surface configured to rise from an outer edge of the mounting surface, in the side surface of the cover body, a concave portion is formed between the mounting surface and a height position of ¼ of a maximum sensor height in a sensor height direction orthogonal to the mounting surface, the sensor body comprises a circuit board, the concave portion in the side surface of the cover body is located between the mounting surface and the circuit board of the sensor body in the sensor height direction, and in a plan view along the sensor height direction, a position of the concave portion in the side surface of the cover body is outside an outer edge of the circuit board.
2 . The tire sensor according to claim 1 , wherein the sensor body comprises: a circuit member configured to constitute the electronic circuitry; and a housing configured to support the circuit member, the circuit member comprises the circuit board, the housing comprises a tubular portion configured to surround a periphery of the circuit board in the plan view, and in the plan view, the position of the concave portion in the side surface of the cover body is across outside and inside of the tubular portion of the housing.
3 . The tire sensor according to claim 1 , wherein a maximum width of the side surface on a side of the mounting surface with respect to the concave portion in the sensor height direction is 0.8 times to 1.2 times a maximum width of the side surface on a side of the circuit board with respect to the concave portion in the sensor height direction.
4 . The tire sensor according to claim 1 , wherein the concave portion in the side surface of the cover body is an annular groove extending over the entire side surface in a circumferential direction.
5 . The tire sensor according to claim 1 , wherein the cover body comprises an annular cover portion made of an elastomer, the annular cover portion configured to cover the periphery of the sensor body in a plan view along the sensor height direction, and the side surface of the cover body is constituted of an outer surface of the annular cover portion.
6 . The tire sensor according to claim 1 , wherein the cover body comprises a pedestal portion made of an elastomer, the pedestal portion configured to cover one side of the sensor body in the sensor height direction, the pedestal portion comprises a facing surface configured to face the sensor body, and the mounting surface configured to be located on an opposite side of the facing surface, and the detector of the sensor body is a strain detector configured to detect, as the tire information, strain information on a tire through the pedestal portion of the cover body.
7 . A tire comprising the tire sensor according to claim 1 .
8 . The tire sensor according to claim 2 , wherein a maximum width of the side surface on a side of the mounting surface with respect to the concave portion in the sensor height direction is 0.8 times to 1.2 times a maximum width of the side surface on a side of the circuit board with respect to the concave portion in the sensor height direction.
9 . The tire sensor according to claim 2 , wherein the concave portion in the side surface of the cover body is an annular groove extending over the entire side surface in a circumferential direction.

Description

TECHNICAL FIELD The present disclosure relates to a tire sensor and a tire. BACKGROUND Technology for mounting tire sensors on inner surfaces of tires for the purpose of detecting temperature and pressure inside the tires is known. Patent Literature (PTL) 1 discloses this type of tire sensor. CITATION LIST Patent Literature PTL 1: JP 2013-226853 A SUMMARY Technical Problem Tires are repeatedly deformed by contact with road surfaces during driving. Therefore, tire sensors mounted on inner surfaces of the tires are required to have durability (hereinafter referred to as “tire sensor durability”) so that the tire sensors are not detached even with the above-described repeated deformation of the tires. In the tire sensor described in PTL 1, the tire sensor durability is enhanced by a groove provided in a rubber base. However, even in the tire sensor described in PTL 1, there is still room for improvement with respect to the tire sensor durability. It would be helpful to provide a tire sensor with improved durability, and a tire. Solution to Problem A tire sensor as a first aspect of the present disclosure is a tire sensor configured to be mountable on a tire inner surface. The tire sensor includes a sensor body including electronic circuitry including a detector configured to be able to detect tire information, and a cover body configured to cover at least a part of a periphery of the sensor body. The cover body includes a mounting surface configured to be mountable on the tire inner surface, and a side surface configured to rise from an outer edge of the mounting surface. In the side surface of the cover body, a concave portion is formed between the mounting surface and a height position of ¼ of a maximum sensor height in a sensor height direction orthogonal to the mounting surface. A tire as a second aspect of the present disclosure includes the tire sensor described above. Advantageous Effect According to the present disclosure, it is possible to provide a tire sensor with improved durability, and a tire. BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings: FIG. 1 is a tire-width-directional cross-sectional view of a tire, as an embodiment of the present disclosure, that includes a tire sensor as an embodiment of the present disclosure; FIG. 2 is a diagram in which the tire sensor illustrated in FIG. 1 is viewed from the side of an inner space of the tire; FIG. 3 is a cross-sectional view of the tire sensor in a cross-section along a sensor height direction; FIG. 4 is an enlarged cross-sectional view of a part of FIG. 3; FIG. 5 is a diagram illustrating deformation of the tire sensor illustrated in FIG. 1 associated with deformation of the tire illustrated in FIG. 1; FIG. 6 is a diagram illustrating details on a detection body of a strain detector illustrated in FIG. 4; and FIG. 7 is a side view of a housing, by itself, illustrated in FIG. 3. DETAILED DESCRIPTION Embodiments of a tire sensor and a tire according to the present disclosure will be exemplarily described below with reference to the drawings. In each of the drawings, the same configurations are denoted with the same reference signs. FIG. 1 is a tire-width-directional cross-sectional view of a pneumatic tire 10 (hereinafter referred to as “tire 10”), as an embodiment of the tire according to the present disclosure. FIG. 1 illustrates a state of the tire 10 assembled on a rim 15. An inner space 10a of the tire 10 is filled with a gas such as air. As illustrated in FIG. 1, the tire 10 includes a tire sensor 1, as an embodiment of the tire sensor according to the present disclosure. FIG. 2 is a diagram in which the tire sensor 1 illustrated in FIG. 1 is seen from the side of the inner space 10a of the tire 10. Here, “tire-width-directional cross-section” means a cross-section parallel to a tire width direction A at a position including a central axial line of the tire 10. FIG. 1 is a tire-width-directional cross-sectional view of the tire 10 that passes through a position at which the tire sensor 1 is located in a tire circumferential direction B. In this specification, “rim” means a standard rim (Measuring Rim in ETRTO's STANDARDS MANUAL and Design Rim in TRA's YEAR BOOK) of an applicable size conformable to industrial standards valid for regions in which tires are produced and used, as described in or to be described in JATMA YEAR BOOK of the JATMA (The Japan Automobile Tyre Manufacturers Association, Inc.) in Japan, STANDARDS MANUAL of the ETRTO (The European Tyre and Rim Technical Organisation) in Europe, YEAR BOOK of TRA (The Tire and Rim Association, Inc.) in the United States, or the like, but in the case of a size that is not listed in such industrial standards, a rim with a width corresponding to a bead width of the tire. “Rim” may be of a size that may be included in the above industrial standards in the future, as well as a current size. Examples of the “size that is included in the future” may be sizes listed as “FUTURE DEVELOP