Title:
建設機械用流量制御弁
Document Type and Number:
Japanese Patent JP2014500936
Kind Code:
A
Abstract:
A flow control valve for a construction machine is provided, which can constantly control a flow rate of hydraulic fluid supplied to a hydraulic actuator through a flow control spool in a spool. The flow control valve for a construction machine, having a valve body in which a supply passage communicating with a pump passage and actuator ports connected to a hydraulic actuator are formed, and a spool installed in the valve body to be shifted, includes a flow control spool shifted in the spool to variably control a cross-sectional area of a passage connected to the one actuator port if a flow rate of the hydraulic fluid that flows through the supply passage is higher than a set flow rate, a first passage formed on the spool to communicate with the supply passage, a second passage formed on the spool to communication with the one actuator port and having a cross-sectional area that is varied depending on the shifting of the flow control spool, a third passage formed on the flow control spool to communicate with the first and second flow control passages, a first signal pressure passage formed on the flow control spool to make a first flow control passage and a pressure chamber communicate with each other, and a second signal pressure passage formed on the flow control spool to make the third passage and a back pressure chamber communicate with each other.
Inventors:
Kubonseok
John Hae Gyun
John Manseok
John Hae Gyun
John Manseok
Application Number:
JP2013540872A
Publication Date:
January 16, 2014
Filing Date:
November 25, 2010
Export Citation:
Assignee:
Volvo Construction Equipment Arbor
International Classes:
F15B11/00
Domestic Patent References:
| JPH109415A | 1998-01-13 | |||
| JPH1193221A | 1999-04-06 | |||
| JPS4921718A | 1974-02-26 | |||
| JPH109415A | 1998-01-13 |
Attorney, Agent or Firm:
Isono Dozo