Decompression unit for internal combustion engine

Details Decompression unit for internal combustion engine Decompression unit for internal combustion engine

F - Mech Eng,Light,Heat,Weapons

01

L

F01L 13/08 (2006.01)

Patent

CA 2372357

In a decompression unit including a decompression arm, a decompression unit for internal combustion engine in which the followability in the opening-and-closing operation of the air intake valve or the exhaust valve with respect to the cam at high- revolution speeds is satisfactory without increasing the equivalent inertia weight of the valve driving system, and the cost can be lowered is provided. A decompression unit comprises a first decompression cam 33 that takes the operating position when the number of revolutions of the engine is not more than the predetermined number of revolution during startup, a second decompression cam 61 that takes the operating position by manual operation, a decompression arm 40 including a first and a second abutting portions 47, 48 that abut against a first and a second decompression cams 33, 61 respectively and an adjusting screw 49 for pressing the rocker arm 17, and a resilient member for bringing the first abutting portion 47 of the decompression arm 40 into abutment against the first decompression cam 33. The decompression arm 40 pivoted by the first and the second decompression cams 33, 61 pivots the rocker arm 17 via the adjusting screw 49 to open the exhaust valve 8.

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