公开(公告)号：DE69311547D1

公开(公告)日：1997-07-17

申请号：DE69311547

申请日：1993-03-17

Applicant: SIEMENS AUTOMOTIVE CORP LP

Inventor： ROBNETT JAMES ,  MOLITOR MARK

IPC: F01L1/14 ,  F01L1/16 ,  F01L1/24 ,  F01L1/255 ,  F01L9/02 ,  F01L13/00

Abstract: A damping mechanism for a lost motion hydraulic actuator utilizes a thin edge orifice in cooperation with a communication passageway between the upper and lower chambers controls the damping of the upper piston on closure. The upper piston is operatively connected to the engine valve of an internal combustion engine. A communication port from the upper chamber to the communication passageway is closed off as the upper piston returns to its normal position forcing the flow of the hydraulic fluid through the thin edge orifice. In this manner the viscosity of the hydraulic fluid does not control the damping of the actuator and the noise factor is substantially reduced.

公开(公告)号：DE69311547T2

公开(公告)日：1998-06-04

申请号：DE69311547

申请日：1993-03-17

Applicant: SIEMENS AUTOMOTIVE CORP LP

Inventor： ROBNETT JAMES ,  MOLITOR MARK

IPC: F01L1/14 ,  F01L1/16 ,  F01L1/24 ,  F01L1/255 ,  F01L9/02 ,  F01L13/00

Abstract: A damping mechanism for a lost motion hydraulic actuator utilizes a thin edge orifice in cooperation with a communication passageway between the upper and lower chambers controls the damping of the upper piston on closure. The upper piston is operatively connected to the engine valve of an internal combustion engine. A communication port from the upper chamber to the communication passageway is closed off as the upper piston returns to its normal position forcing the flow of the hydraulic fluid through the thin edge orifice. In this manner the viscosity of the hydraulic fluid does not control the damping of the actuator and the noise factor is substantially reduced.