Internal-combustion engines – Starting device – Compression relieving type
Patent
1992-03-19
1993-03-30
Dolinar, Andrew M.
Internal-combustion engines
Starting device
Compression relieving type
298881, F01L 1308
Patent
active
051974223
ABSTRACT:
The compression release mechanism for an internal combustion engine is inexpensive, easy to manufacture and assemble, and does not use any welds, pins or other fasteners to keep the components together. The compression release mechanism includes a flyweight having an aperture therein, a bushing having a sleeve portion that fits in the flywheel aperture and having a flange portion, and a lightweight torsion spring having at least several turns that is captured between the flywheel and the bushing flange. The compression release shaft that fits within the sleeve has a knurled outer surface to provide an interference fit with the deformable nylon bushing. The flywheel aperture, the sleeve portion, and the knurled section of the compression release shaft are preferably all D-shaped to provide positive positioning without the need for welds, pins and fasteners. The entire force of the valve tappet is borne by a D-shaped end of the compression release shaft so that a cam shaft surface need not be machined to support the compression release shaft. The opposite end of the release shaft is disposed within a cam gear aperture having a very close tolerance with the compression release shaft.
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"EH Overhead Valve Engines . . . Robin" by Fuji Heavy Industries Ltd. issue EMD-EH0667 (1990.04).
Fliss Gene V.
Oleksy Paul D.
Briggs & Stratton Corporation
Dolinar Andrew M.
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