초록 ▼

Adjacent an axially displaceable engine poppet valve (12) is a fluid pathway (36). Within the fluid pathway (36) is a snubbing valve (14) including a snubber (48) movable between first and second locations within the pathway (36) and a snubbing passage (54). When the poppet valve (12) is open, the s

Adjacent an axially displaceable engine poppet valve (12) is a fluid pathway (36). Within the fluid pathway (36) is a snubbing valve (14) including a snubber (48) movable between first and second locations within the pathway (36) and a snubbing passage (54). When the poppet valve (12) is open, the snubber (48) is at its first location and there is fluid in the fluid pathway (36) between the snubber (48) and poppet valve (12). During a first portion of displacement of the poppet valve (12) as it closes, the snubber (48) is displaced to its second location. During the second portion of displacement of the poppet valve (12) as it closes, fluid in the fluid pathway (36) is snubbed through the snubbing passage (54), thereby increasing the pressure in the fluid in the pathway (36), thereby providing a resistive force against movement of the poppet valve (12), thereby slowing the poppet valve (12) to an acceptable impact seating velocity.

대표청구항 ▼

A method for slowing movement of an engine valve poppet during a portion of its travel, the engine valve poppet being in fluid communication with a hydraulic passageway and being actuable between first and second positions in response to fluid pressure in said hydraulic passageway, the hydraulic pas

A method for slowing movement of an engine valve poppet during a portion of its travel, the engine valve poppet being in fluid communication with a hydraulic passageway and being actuable between first and second positions in response to fluid pressure in said hydraulic passageway, the hydraulic passageway including a dampening member actuable against a first stop in response to fluid pressure in said hydraulic passageway, said dampening member including a second fluid passageway for restricting fluid flow therethrough, the method comprising the steps of: applying high fluid pressure in said hydraulic passageway to actuate said dampening member away from said first stop; said dampening member moving with said high fluid pressure to actuate said engine valve poppet during a first portion of its travel from said first position to said second position; applying low fluid pressure in said hydraulic passageway to actuate said dampening member against said first stop; said dampening member being seated against said first stop to restrict fluid flow through said second fluid passageway to dampen movement of said engine valve poppet during a first portion of its travel from said second position to said first position as said high fluid pressure is being dissipated primarily through said second fluid passageway.