초록 ▼

The present invention is an apparatus 10 for hydraulically slowing a member (12), preferably an engine poppet valve, to an acceptable impact seating velocity as the valve (12) is moved from open to closed. The poppet valve (12) has a stem (16) having a first portion (18) connected through a stepped

The present invention is an apparatus 10 for hydraulically slowing a member (12), preferably an engine poppet valve, to an acceptable impact seating velocity as the valve (12) is moved from open to closed. The poppet valve (12) has a stem (16) having a first portion (18) connected through a stepped portion (20) to a second portion (22) having a greater cross-sectional area than the first portion (18). The valve (12) rides within a guide body (28) having an opening (34) in an end wall (32) thereof through which the first portion (18) of the stem (16) extends. A hydraulic fluid space (50) is formed by the guide body (28) and the valve (12). As the valve (12) closes, fluid is forced out of the space (50) through a first fluid exit opening (66). As the valve (12) nears its seat (44), the fluid still in the space (50) is forced out through a second fluid exit opening (68) through which the rate of flow is less than the rate of flow through the first fluid exit opening (66). As the valve (12) continues closing, fluid still in the space (50) is compressed, increasing its hydraulic pressure and creating a resistive force to further movement of the poppet valve (12), thereby slowing it to an acceptable impact velocity.

대표청구항 ▼

An apparatus (10) for controllably altering the speed of an engine poppet valve (12) during movement of the valve (12) between first and second locations, comprising: a guide body (28) having walls (30); said valve (12) being positioned within said guide body (28) and being moveable between said fir

An apparatus (10) for controllably altering the speed of an engine poppet valve (12) during movement of the valve (12) between first and second locations, comprising: a guide body (28) having walls (30); said valve (12) being positioned within said guide body (28) and being moveable between said first and second locations, said valve (12) having first and second ends; elements (30,32,12) defining a space (50), said space being disposed between said first and second ends of said valve, said space (50) having a volume which varies with the position of said valve (12), the volume of said space (50) being greatest when said valve (12) is at said first location and decreasing as said valve (12) is moved in the direction from said first location towards said second location; a first fluid exit opening (66) in communication with said space (50) when said valve (12) is at said first location; a second fluid exit opening (68) in communication with said space (50) when said valve (12) is at said second location; and a port (52) having a first end (54) in communication with said space (50) at least when said valve (12) is at a location between said first and second locations and is spaced from said second location and a second end (56) in communication with a hydraulic fluid supply (58), said valve (12), when positioned at said second location, obstructing communication between said port (52) and said space (50).