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Patent Searching and Data


Title:
POWER STEERING DEVICE
Document Type and Number:
Japanese Patent JPH0740851
Kind Code:
A
Abstract:

PURPOSE: To improve response performance by providing a switching valve leading hydraulic oil in the high-pressure side cylinder chamber of a power cylinder to a differential pressure detecting means to integrally collect a differential pressure detecting means and the switching valve to reduce line resistance.

CONSTITUTION: This device is provided with a hydraulic pump 3 driven by an electric motor, a sensor-closed type servo valve 5 operated by steering a steering device 91, and a power cylinder 94 operated according to the operation of the servo valve 5. Also switching valve 2 is provided by which oil pressure from the high-pressure side cylinder chamber 94A of a cylinder 94 is drawn to be led to a differential pressure detecting means 1 is provided. A spool 11 is moved by the differential pressure between oil pressure on a high-pressure cylinder chamber 94A side introduced from a switching valve 2 and line pressure from a supply path 51. Resultingly a displacement detecting means 12 is operated to output a signal to a controlling means to drive an electric motor. The switching valve 2 and the differential pressure detecting means 1 are housed in the same housing 19, and moreover the servo valve 5 is integrated to shorten an oil pressure passage.


Inventors:
HAGA KYOSUKE
SUZUKI MIKIO
FUKUMURA KENICHI
SUGIYAMA HIDEAKI
Application Number:
JP20896593A
Publication Date:
February 10, 1995
Filing Date:
July 30, 1993
Export Citation:
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Assignee:
TOYODA MACHINE WORKS LTD
International Classes:
B62D6/00; B62D5/07; B62D6/02; B62D123/00; (IPC1-7): B62D6/02; B62D6/00
Attorney, Agent or Firm:
Satoru Ogawa