Auto-decompression system for engines
This patent describes a valve control device for an engine having a combustion chamber, a valve controlling communication with the chamber, a camshaft rotatably mounted in the engine, a valve motion cam fixed to the camshaft for rotation therewith, and a valve actuation mechanism including a cam follower engageable with the valve motion cam, the valve control device comprising: a decompression cam carried by the camshaft axially adjacent the valve motion cam, the decompression cam including a base circle portion defining an outer peripheral surface smaller in radial extent than the outer peripheral surface of the valve motion cam and having an inner bore to loosely encircle the camshaft; means for adjusting the position of the decomposition cam with respect to the camshaft between two locations including a first location on which the outer peripheral surface of the decompression cam extends radially outwardly from the axis of the camshaft to an extent greater than that of the valve motion cam to engage the cam follower for decompression operation of the valve, and a second location at which the outer peripheral surface of the decompression cam extends radially outwardly from the axis of the camshaft to an extent less than that of the valve motion cam whereby the valve motion cam engages the cam follower for normal operation of the valve; and means responsive to the rotational speed of the camshaft for automatically moving the decompression cam between the first and second locations.
- Assignee:
- Honda Giken Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4790271
- OSTI ID:
- 6232948
- Resource Relation:
- Patent File Date: Filed date 8 May 1987
- Country of Publication:
- United States
- Language:
- English
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