Tire internal pressure alarm device
First Claim
1. A tire internal pressure alarm device having a casing in which a pressure sensor for detecting an internal pressure of a tire and electronic components for processing signals with regard to the internal pressure are embedded, the casing being provided with a pressure introduction passage for introducing the internal pressure from a pressure introduction aperture formed on an outer surface of the casing to a pressure sensing portion of the pressure sensor, wherein an elastic member constituting at least a part of a labyrinth structure is positioned between an inner surface of the casing and a front face of the pressure sensing portion of the pressure sensor.
1 Assignment
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Accused Products
Abstract
An elastic member 11 positioned between an inner surface of a casing 2 and a front face of a pressure sensing portion 8 of a pressure sensor 1 reduces a possibility of liquid and foreign matters in a tire directly reaching the pressure sensing portion 8. The elastic member also increases adhesiveness between the pressure sensing portion 8 of the pressure sensor 1 and a labyrinth structure and further prevents a potting agent 9b from flowing into the sensing portion 8. Moreover, the elastic member 11 is a member constituting at least a part of the labyrinth structure, so that it does not need that a wall is provided on the pressure sensor 1 and a dedicated seal member is provided on the pressure sensing portion 8.
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Citations
8 Claims
- 1. A tire internal pressure alarm device having a casing in which a pressure sensor for detecting an internal pressure of a tire and electronic components for processing signals with regard to the internal pressure are embedded, the casing being provided with a pressure introduction passage for introducing the internal pressure from a pressure introduction aperture formed on an outer surface of the casing to a pressure sensing portion of the pressure sensor, wherein an elastic member constituting at least a part of a labyrinth structure is positioned between an inner surface of the casing and a front face of the pressure sensing portion of the pressure sensor.
Specification