Fluid handling – Processes – Carbonated beverage handling processes
Patent
1992-01-13
1995-06-06
Walton, George L.
Fluid handling
Processes
Carbonated beverage handling processes
123 9012, 251 48, 251 57, F01L 102, F01L 902, F16K 31122
Patent
active
054213592
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
A snubber for decelerating a moving member, and more particularly, a snubber for decelerating an engine poppet valve during valve closing to an acceptable impact velocity before the valve contacts the valve seat.
BACKGROUND ART
Engine combustion chamber valves are almost universally of a poppet type. A number of means exist for opening such valves including a cam on a rotating cam shaft, hydraulic pressure, electromagnets, and others.
Engine valves are typically spring loaded toward a valve-closed position and opened against the spring bias. Because the valve should open and close very quickly, the spring is typically very stiff and is loaded to a high force under the relatively high force needed to open the valve quickly against the high internal pressures of the combustion chamber. Therefore, when the valve closes, it impacts the valve seat at velocities that can create forces which eventually erode the valve or the valve seat or even fracture or break the valve.
Therefore, it is an object of the present invention to provide a means whereby the valve will be slowed or snubbed as it nears the valve seat so that the valve seats at an acceptable velocity.
It is an additional object of the present invention to provide a hydraulic snubbing valve for slowing the engine poppet valve, wherein the snubbing valve restricts fluid flow exiting a hydraulic fluid path between the engine valve and the snubbing valve as the engine valve closes, thereby slowing the engine valve to an acceptable impact velocity.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, an apparatus for controllably altering the speed of an engine poppet valve during movement of the poppet valve between first (open) and second (closed) locations is disclosed.
The apparatus includes a valve body having a fluid pathway formed therein. The poppet valve has a first end positioned adjacent a first end of the fluid pathway. The pathway includes a snubber cavity having first and second stops. Positioned within said snubber cavity is a snubber having first and second ends. Extending between the first and second ends of the snubber is a snubbing passage. The snubber is movable between a first location whereat the snubber is against the first stop of the snubber cavity and a second location whereat the snubber is against the second stop of the snubber cavity.
In another aspect of the present invention, a method for controllably altering the speed of an engine poppet valve during movement of the poppet valve between its first and second locations is disclosed. The method includes: the poppet valve exerting a force on fluid in the fluid pathway as the poppet valve is moved in a direction from its open to its closed locations; the force being transmitted through the fluid to the first end of the snubber; the snubber being moved from its first location to its second location by the force; the snubber being stopped at its second location by the first stop of the snubber cavity; fluid being controllably passed through the snubbing passage; the pressure in the fluid being increased in response to controlling the fluid passing through the snubbing passage as the poppet valve continues moving; and the speed of the poppet valve being controllably altered in response to the increasing fluid pressure during further movement of the poppet valve.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an elevation, cross-sectional depiction of an engine poppet valve, fluid pathway, and snubbing valve of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring now to FIG. 1, a preferred embodiment of an apparatus 10 for controllably altering the speed of a moving member 12, in this case an engine poppet valve, by use of a snubbing valve 14, is shown. The poppet valve 12 includes a head 16 connected to a stem 18 and a first end 20. The stem 18 includes a plunger 22. The poppet valve 12 is movable in a longitudinal direction; down to open, which for purposes of this description is its first location, and up to close, which
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Meister Steven F.
Shafer Scott F.
Caterpillar Inc.
Skarvan Dennis C.
Walton George L.
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