VARIABLE DISPLACEMENT SWASH PLATE TYPE HYDRAULIC PUMP

Title:

VARIABLE DISPLACEMENT SWASH PLATE TYPE HYDRAULIC PUMP

Document Type and Number:

Japanese Patent JP2006077708

Kind Code:

A

Abstract:

To measure positions of feedback links provided in a plurality of variable displacement swash plate type hydraulic pumps respectively, without providing position sensors in the respective variable displacement swash plate type hydraulic pumps.

Swash plates 28A, 28B, tilting actuators 33A, 33B driving the swash plates 28A, 28B and the feedback links 41A, 41B for transmitting tilting angles of the swash plates 28A, 28B to a regulator are provided. Measurement ports 42A, 42B into which the position sensors 50A, 50B measuring the positions of the feedback links 41A, 41B, respectively can be inserted are formed in a casing main body 2. Plugs 43A, 43B for closing the measurement ports 42A, 42B when the respective position sensors 50A, 50B are not inserted into the corresponding measurement ports 42A, 42B are provided.

Inventors:

ARIGA SHIYUUEI
ISHIKAWA HIROJI
TAKEUCHI YOSHINORI
SAKAIRI TETSUYA

Application Number:

JP2004264230A

Publication Date:

March 23, 2006

Filing Date:

September 10, 2004

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY

International Classes:

F04B1/22; F04B23/06

Domestic Patent References:

JPH1137042A	1999-02-09
JP2003227471A	2003-08-15
JPH0942148A	1997-02-10
JPH0710470U	1995-02-14

Foreign References:

WO2000003142A1

2000-01-20

Attorney, Agent or Firm:

Kenjiro Take
Ichiro Suzuki
Hirohiro Ichimura
Kazunori Satake

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