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Title:
MULTI-STAGE HYDRAULIC RATIO CONVERSION DEVICE
Document Type and Number:
Japanese Patent JP2010164085
Kind Code:
A
Abstract:

To convert hydraulic pressure supplied from a hydraulic supply source to a desired value in a static transmission structure for pressure without depending on a dynamic differential pressure generation mechanism such as a spool valve.

A multi-stage hydraulic pressure conversion device includes: a reference thrust plunger 11 always receiving hydraulic pressure supplied from the hydraulic supply source 10 and generating hydraulic thrust; an output plunger 12 attached to a connection member 15 connected to the reference thrust plunger 11, receiving the hydraulic thrust of the reference thrust plunger 11 and generating output hydraulic pressure; a positive thrust plunger 21 attached to the connection member 15 and generating hydraulic thrust in the same direction with the hydraulic thrust of the reference thrust plunger 11; a negative thrust plunger 22 attached to the connection member 15 and generating hydraulic thrust in an opposite direction to the hydraulic thrust of the reference thrust plunger 11; and a switching means for switching the hydraulic pressure supply state of the hydraulic pressure supplied to the positive thrust plunger 21 and negative thrust plunger 22 from the hydraulic supply source 10 to vary the magnitude of the output hydraulic pressure generated by the output plunger 12 in multiple stages.

COPYRIGHT: (C)2010,JPO&INPIT


Inventors:
TAKAHASHI HISAYUKI
Application Number:
JP2009004830A
Publication Date:
July 29, 2010
Filing Date:
January 13, 2009
Export Citation:
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Assignee:
ISUZU MOTORS LTD
International Classes:
F15B3/00
Domestic Patent References:
JP2001153106A2001-06-08
JPS5145384A1976-04-17
JPS491977A1974-01-09
JPS517587U1976-01-20
JPH0814212A1996-01-16
JP2002144089A2002-05-21
JPS517588U1976-01-20
Attorney, Agent or Firm:
絹谷 信雄