INERTIA BODY DRIVE DEVICE

WIPO Patent Application WO/2007/125933

A1

A main pipeline on the high pressure side out of main pipelines (4A, 4B) is communicated, between a hydraulic motor (1) and a directional control valve (5), with a high pressure side oil path (14), and a pressure selection valve (13) for causing the low pressure side main pipeline to be communicated with a low pressure side oil path (15) is provided also between the hydraulic motor (1) and the directional control valve (5). When a spool valve device (16) is switched to a valve open position (e) by pressurized oil supplied from an oil containing chamber (26) of a cylinder device (22), a branch path (14A) of the high pressure side oil path (14) and the low pressure side oil path (15) are communicated with each other. Then, when the pressure difference between the main pipelines (4A, 4B) is small, the pressure selection valve (13) automatically returns to the neutral position to shut off the connection between the main pipelines (4A, 4B). The construction suppresses reverse operation of the hydraulic motor (1) to enable smooth stop of an inertia body even, for example, in a cold region.

INO KAZUYUKI (JP)
UENO KATSUMI (JP)

PCT/JP2007/058891

November 08, 2007

April 18, 2007

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HITACHI CONSTRUCTION MACHINERY (JP)
INO KAZUYUKI (JP)
UENO KATSUMI (JP)

F15B11/00; E02F9/22

WO1994001682A1	1994-01-20
WO1994001682A1	1994-01-20

JPH09310701A	1997-12-02
JPH05321906A	1993-12-07
JPS5820704U	1983-02-08
JPH0527304U	1993-04-09

HIROSE, Kazuhiko (1-2 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, JP)

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