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1. (US4783993) Tire pressure sensor for motor vehicles

Office : United States of America
Application Number: 07095536 Application Date: 23.07.1987
Publication Number: 4783993 Publication Date: 15.11.1988
Grant Number: 4783993 Grant Date: 15.11.1988
Publication Kind : A
Prior PCT appl.: Application Number:DE86000446 ; Publication Number: Click to see the data
IPC:
G01L 7/08
B60C 23/04
B60C 23/00
G01L 9/00
B60C 23/02
H01H 35/24
H01H 35/26
G PHYSICS
01
MEASURING; TESTING
L
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
7
Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
02
in the form of elastically-deformable gauges
08
of the flexible-diaphragm type
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
C
VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
23
Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps, of tanks; Tyre cooling arrangements
02
Signalling devices actuated by tyre pressure
04
mounted on the wheel or tyre
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
C
VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
23
Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps, of tanks; Tyre cooling arrangements
G PHYSICS
01
MEASURING; TESTING
L
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9
Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
B PERFORMING OPERATIONS; TRANSPORTING
60
VEHICLES IN GENERAL
C
VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
23
Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps, of tanks; Tyre cooling arrangements
02
Signalling devices actuated by tyre pressure
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
35
Switches operated by change of a physical condition
24
Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
35
Switches operated by change of a physical condition
24
Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
26
Details
CPC:
B60C 23/0408
H01H 35/2671
Applicants: Robert Bosch GmbH
Inventors: Lothar Haas
Gerhard Hettich
Hans-Dieter Schmid
Agents: Striker Michael J.
Priority Data: 3543866 12.12.1985 DE
Title: (EN) Tire pressure sensor for motor vehicles
Abstract: front page image
(EN)

A tire pressure sensor for motor vehicles comprises a pressure switch which is actuated by the tire pressure for monitoring the tire pressure. The pressure switch has a reference pressure chamber which is closed in the direction of the tire by means of an electrically conducting diaphragm and carries a contact pin which is contacted by the middle area of the diaphragm in order to close an electric circuit when there is sufficient air pressure in the tire. In order to trigger an alarm signal during a leak in the reference pressure chamber a leakage check of the reference pressure chamber is realized in that an air gap is located between the contact pin and the middle area of the diaphragm when there is equal pressure on both sides of the diaphragm.


Also published as:
EP0248821WO/1987/003547