Variable overhead valve control for engines
OwnerTerry Buelnainventor
Life of this patent
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Abstract
A valve control mechanism is provided for an overhead valve, internal combustion engine having a camshaft moving a pushrod to move a rocker arm that in turn moves the valve. Three aligned rollers are fastened to the end of the pushrod adjacent the rocker arm. The outer two rollers roll along parallel profiled surfaces that control at least the valve lift and ramp. The middle roller rolls along an engaging surface on the rocker to move the rocker arm in a motion determined by the configuration and location of the profiled surfaces and the engaging first and second rollers. The outer rollers rotate in a direction opposite the middle roller.
Claims20
A valve control mechanism for an overhead valve, internal combustion engine having a camshaft moving a pushrod to move a rocker arm that in turn moves the valve, the pushrod defining a first end portion opposite the camshaft and a second end portion adjacent to the camshaft, comprising:
- a first roller rotatably connected to the first end portion of the pushrod that is opposite the camshaft;
- a second roller rotatably connected to the first end portion of the pushrod that is opposite the camshaft;
- a roller guide having a first profiled surface, the first roller and roller guide positioned so the first roller rolls along the first profiled surface, the first profiled surface configured to achieve a desired valve movement;
- and
- an engaging surface on the rocker arm with the rocker arm and second roller positioned so the second roller rolls along the engaging surface of the rocker arm to rotate the rocker arm as the first roller rolls along the first profiled surface.
A valve control mechanism for an overhead valve, internal combustion engine having a camshaft moving a pushrod to move a rocker arm that in turn moves the valve, the pushrod defining a first end portion opposite the camshaft and a second end portion adjacent to the camshaft, comprising:
- a roller guide having a two similarly profiled surfaces configured to control the valve closed, ramp and valve lift, the profiled surfaces spaced apart with a slot between them;
- three rollers rotatably connected to the first end portion of the pushrod that is opposite the camshaft, two of the rollers coaxially aligned and abutting a different one of the profiled surfaces and the third roller fining in the slot;
- a rocker arm surface on one arm of the rocker arm, the rocker arm surface located opposite the profiled surfaces with the third roller rolling on the rocker arm surface in a direction opposite the other two rollers.
A valve control mechanism for an overhead valve, internal combustion engine having a camshaft moving a pushrod to move a rocker arm that in turn moves the valve, comprising:
- a pushrod having first and second rollers rotatably mounted at one end of the pushrod, the first roller rolling against a profiled surface in a first direction and the second roller rolling against an engaging surface on the rocker arm in an opposing direction and moving the rocker arm in a motion defined by the shape of the profiled surface.
Dependencies are inferred from the claim text.