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Title:
ROTATION-TYPE WORKING MACHINE
Document Type and Number:
WIPO Patent Application WO/2012/150650
Kind Code:
A1
Abstract:
Provided is a rotation-type working machine configured so that back pressure generated during the drive of rotation can be reduced. This rotation-type construction machine is provided with: a lower travel body; an upper rotation body; a hydraulic motor (11) having first and second ports (11a, 11b) and rotationally driving the upper rotation body; a hydraulic pump (10); a rotation operation device (12) including an operation member (12a); a control valve (13) for controlling the hydraulic motor (11) on the basis of an operation signal from the rotation operation device (12); first and second conduits (14, 15) connecting the control valve and the first and second ports (11a, 11b) of the hydraulic motor (11); communication switching devices (25, 26) capable of switching between the connection between a tank (T) and both conduits (14, 15) and the interruption of the connection; and a switching commanding section (27) which, when rotationally driving the upper rotation body, operates the communication switching devices (25, 26) so that, among both conduits (14, 15), only the conduit corresponding to the conduit on the discharge side of the hydraulic motor (11) is connected to the tank (T) without passing through the control valve (13).

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Inventors:
KAMIMURA YUSUKE
Application Number:
PCT/JP2012/002718
Publication Date:
November 08, 2012
Filing Date:
April 19, 2012
Export Citation:
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Assignee:
KOBELCO CONSTR MACH CO LTD (JP)
KAMIMURA YUSUKE
International Classes:
E02F9/20; E02F9/22; F15B11/00; F15B11/08
Foreign References:
JP2012127123A2012-07-05
JP2010065510A2010-03-25
JP2005344431A2005-12-15
JP2010065510A2010-03-25
Other References:
See also references of EP 2706150A4
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
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Claims:



 
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