Tire-state detection device

• US 10,099,521 B2
• Filed: 01/26/2015
• Issued: 10/16/2018
• Est. Priority Date: 02/25/2014
• Status: Active Grant

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Yamaguchi, Shigeru
• Primary Examiner(s): West, Paul
• Application Number:
  US15/120,593
• Publication Number:
  US 20170015149A1
• Time in Patent Office: 1,359 Days
• CPC Class Codes: B60C 19/00 Tyre parts or constructions not otherwise provided for
• CPC Class Codes: B60C 23/0474 Measurement control, e.g. setting measurement rate or calibrating of sensors; Further processing of measured values, e.g. filtering, compensating or slope monitoring
• CPC Class Codes: B60C 23/0493 for attachment on the tyre
• CPC Class Codes: B60C 23/18 Tyre cooling arrangements , e.g. heat shields wheels with cooling fins B60B19/10
• CPC Class Codes: G01L 17/00 Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
• CPC Class Codes: G01L 2019/0053 Pressure sensors associated with other sensors, e.g. for measuring acceleration, temperature
• CPC Class Codes: G01L 9/0075 using a ceramic diaphragm, e.g. alumina, fused quartz, glass

Abstract

A tire-state detection device according to the present invention includes: an electronic component including a detection unit that detects a pressure of a tire; and a case that houses the electronic component. The case includes: a case main body that houses the electronic component and that has an open surface formed thereon; and a lid member that covers the open surface. The detection unit includes: a pressure sensor section having a diaphragm-type element; a sensor control section that controls the pressure sensor section; and a dome-shaped shield cover that covers the pressure sensor section and the sensor control section. An inside of the case main body having the open surface covered with the lid member is filled with a sealant, and the diaphragm-type element is made of a ceramic.

Claims

1. A tire-state detection device comprising:

an electronic component including a detection unit that detects a pressure of a tire; and

a case that houses the electronic component, wherein

the case includes

a box member that houses the electronic component and that has an open surface formed thereon, and

a lid member that covers the open surface,

the detection unit includes

a pressure sensor section having a diaphragm-type element,

a sensor control section that controls the pressure sensor section, and

a dome-shaped cover member that covers the pressure sensor section and the sensor control section,

an inside of the box member having the open surface covered with the lid member is filled with a sealant, and

the diaphragm-type element is made of a ceramic,

the detection unit includes an introduction pipe that connects a pressure reception surface of the diaphragm-type element to an outside of the case,

a pipe insertion hole through which the introduction pipe is inserted is formed in the cover member,

the introduction pipe is formed in a cylindrical shape,

the pressure reception surface of the diaphragm-type element is formed in a circular shape, and

an inner diameter of the introduction pipe is equal to or larger than a diameter of the pressure reception surface of the diaphragm-type element.

2. The tire-state detection device according to claim 1, wherein

the inner diameter of the introduction pipe is equal to the diameter of the pressure reception surface of the diaphragm-type element.

3. The tire-state detection device according to claim 1, wherein

an external pipe insertion hole through which the introduction pipe is inserted is formed in the box member,

a front end portion of the introduction pipe is located inside the external pipe insertion hole,

an external cap that covers the external pipe insertion hole is provided outside the external pipe insertion hole, and

one or a plurality of ventilation holes are formed in the external cap.

4. The tire-state detection device according to claim 1, wherein

the pressure sensor section and the sensor control section in the detection unit are separate sections.