Patent ID: 7080659
Filing Date: 2006-07-25
Classification: B62D,Y10T

Abstract:
1. A damper valve comprising: a hollow casing including a first port connected to a hydraulic pump side and a second port connected to a hydraulic actuator side; a valve sleeve which divides the casing into a first chamber communicating with the first port and a second chamber communicating with the second port and includes a plurality of communicating passages communicating the first chamber with the second chamber; a spool relatively movable with respect to the valve sleeve in an axial direction provided at the first chamber; a spring for urging the spool toward the second chamber; a supply port for supplying hydraulic oil, supplied to the first chamber through the first port, to the second chamber through the spool and the valve sleeve; a one-way valve provided in the supply port for allowing the hydraulic oil to flow from the first port to the second port and inhibiting the hydraulic oil from flowing from the second port to the first port; a reflux passage which leads the hydraulic oil from the second chamber to the first chamber through the plurality of communicating passages; and a valve member defining a gap between an outer circumference of the valve member and said valve sleeve, said valve member also for covering openings of the communicating passages which face the first chamber, wherein the valve member is elastically deformed by a low flow rate of the hydraulic oil flowing from the second chamber to the first chamber and when a flow rate of the hydraulic oil flowing from the second chamber to the first chamber exceeds a predetermined value, the valve member is moved with the spool against urging force of the spring to widely open the openings of the communicating passages.