Internal-combustion engines – Starting device – Compression relieving type
Patent
1997-05-08
1998-10-20
Dolinar, Andrew M.
Internal-combustion engines
Starting device
Compression relieving type
F01L 1308
Patent
active
058231536
ABSTRACT:
The centrifugally-responsive compression release apparatus of the present invention is a compact unit which can be simply snap-fit to a position on the cam shaft during assembly and will retain that position during engine operation. The compression release apparatus relieves compression in at least one chamber of an internal combustion engine by utilizing a lift member engageable with a valve operating device and centrifugally-responsive means for changing the position of the lift member in response to engine speeds. The apparatus includes a base member which can be injection molded to a shape of a segmented cylinder thereby substantially corresponding to the shape of the outer surface of the cam shaft. The base member also provides means for integrating and retaining the dynamic components of the apparatus to the base member. Furthermore, the compression release apparatus is adaptable to utilizing a single centrifugally-responsive means, such as a flyweight, to engage more than one valve operating device, thereby relieving pressure in more than one combustion chamber. Thus, the compression release apparatus is easy to manufacture and easy to install on the engine, and does not require any major modification to engine components.
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Photo of Compression Release Device first sold by Briggs and Stratton Corporations about Mar., 1988.
Kratz David A.
Santi John D.
Briggs & Stratton Corporation
Dolinar Andrew M.
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