Title:
TRAVEL OPERATION CIRCUIT FOR WORKING MACHINE
Document Type and Number:
Japanese Patent JP3815990
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a travel operation circuit for working machine capable of driving a hydraulic motor in a state of suppressing a starting shock while having a counter balance valve.
SOLUTION: The counter balance valve 20 is provided with an oil discharge port 20a which communicates with a supply side oil passage 28 when the counter balance valve 20 is switched to an opening position O. The oil discharge port 20a is connected to an operational oil passage 11 through a cushion oil passage 30 having an opening and closing valve 32 and a restricting part 31. A pilot operational oil passage 33 is connected to the opening and closing valve 32. The pilot operational oil passage 33 operates the opening and closing valve 32 to be in a state of closing by a pilot pressure from the operational oil passage 11 after the counter balance valve 20 is switched to the opening position O.
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Inventors:
Isao Tsurumi
Application Number:
JP2001291493A
Publication Date:
August 30, 2006
Filing Date:
September 25, 2001
Export Citation:
Assignee:
Kubota Corporation
International Classes:
F16H61/40; F16H61/4043; F16H61/4148; F16H61/4157; F16H59/10; F16H61/66; (IPC1-7): F16H61/40
Domestic Patent References:
| JP58131405A | ||||
| JP57137805U | ||||
| JP55009963U | ||||
| JP59185454U | ||||
| JP4131504A | ||||
| JP8261133A |
Attorney, Agent or Firm:
Shuichiro Kitamura