A decompression device of a four-stroke cycle internal...

Details A decompression device of a four-stroke cycle internal... A decompression device of a four-stroke cycle internal...

F - Mech Eng,Light,Heat,Weapons

02

N

F02N 99/00 (2010.01) F01L 13/08 (2006.01) F02D 15/00 (2006.01) F02N 3/02 (2006.01)

Patent

CA 2298986

A small and light decompression device of a four- stroke-cycle engine which cancels decompression operation surely when the engine rotational speed exceeds a predetermined speed to enable a stable engine starting. The device comprises an axial hole formed in a cam shaft , an oil pressure chamber formed in the axial hole, a decompression shaft reciprocating in accordance with oil pressure in the oil pressure chamber, a decompression pin which drives an exhaust valve to open in the compression stroke when the decompression shaft positions at a first position and stops the opening drive of the exhaust valve when the decompression shaft positions at a second position, a weight rotating in accordance with the engine rotational speed, and an oil pressure control valve interlocked with the weight to open and close a leak hole for controlling oil pressure in the oil pressure chamber.

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