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Title:
WORKING MACHINE AND HYDRAULIC CIRCUIT OF THE SAME
Document Type and Number:
Japanese Patent JP2010236648
Kind Code:
A
Abstract:

To reduce a so-called nose dive phenomenon, in which a vehicle body B leans forward when braking, even when a storage amount of a tank T decreases.

A working machine for being travelled includes a hydrostatic transmission with a closed circuit formed of a variable displacement pump P and a hydraulic motor M connected through a pair of connection flow paths 2, 3. In the working machine, a short-circuit passage 4 is provided in the closed circuit and a shut-off valve 5 is provided in the short-circuit passage 4 for opening and closing the short-circuit passage 4. When the shut-off valve 5 is kept at an open position, if a brake is operated while the tank T is empty, the hydraulic motor M gradually stops while performing pumping operation.


Inventors:
TANAKA YASUO
Application Number:
JP2009000086279
Publication Date:
October 21, 2010
Filing Date:
March 31, 2009
Export Citation:
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Assignee:
KYB ENGINEERING & SERVICE CO LTD
International Classes:
F16H39/02; A01M7/00; B60T7/02; F15B11/08
Domestic Patent References:
JPH0312659U1991-02-08
JPH01147735U1989-10-12
JPS4841388Y11973-12-03
JPH062767A1994-01-11
JP2006304695A2006-11-09
Attorney, Agent or Firm:
嶋 宣之