Title:
PRESSURE PULSATION ABSORPTION DEVICE FOR HYDRAULIC CONSTRUCTION MACHINE
Document Type and Number:
Japanese Patent JP2009264560
Kind Code:
A
Abstract:
To inexpensively absorb pressure pulsation without requiring excessive space.
A hydraulic shovel has a circuit configuration of respectively connecting a travel hydraulic motor driving traveling of a lower traveling body and a plurality of hydraulic actuators operating a work attachment attached to an upper revolving body via a switching valve to a hydraulic pump in a state of the switching valve of the traveling hydraulic motor being positioned in a most upstream side. A hollow part 24 and a neck 25 carrying out pressure pulsation absorption work by a principle of Helmholtz resonance are provided in a spool 20 of the selector valves 10, 14 of the traveling hydraulic motor.
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Inventors:
UEDA KOJI
Application Number:
JP2008117684A
Publication Date:
November 12, 2009
Filing Date:
April 28, 2008
Export Citation:
Assignee:
KOBELCO CONSTR MACHINERY LTD
International Classes:
F15B21/04; F16K11/07; F16K47/00; F16L55/04
Domestic Patent References:
| JP2004204868A | 2004-07-22 | |||
| JPH0618465U | 1994-03-11 | |||
| JPH09166261A | 1997-06-24 | |||
| JP2007278625A | 2007-10-25 | |||
| JP2005331154A | 2005-12-02 | |||
| JP2002286153A | 2002-10-03 | |||
| JPS6068368U | 1985-05-15 | |||
| JPS4721675B1 | ||||
| JP2001304433A | 2001-10-31 | |||
| JPH03130979U | 1991-12-27 | |||
| JPS60126550U | 1985-08-26 |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Muramatsu Toshiro
Masataka Otani
Muramatsu Toshiro
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