JPS6165213U

JPS6165213U -

Info

Publication number: JPS6165213U
Application number: JP15074984U
Authority: JP
Priority date: 1984-10-04
Filing date: 1984-10-04
Publication date: 1986-05-02
Also published as: JPH0241290Y2

Description

[Brief explanation of the drawing]

第１図乃至第９図は本考案の第一実施例に係り
、第１図はカムギヤ端面部分の図、第２図は第１
図のＡ−Ａ線断面図、第３図は第１図のＢ−Ｂ線
断面図、第４図は圧縮行程側デコンプピンの斜視
図、第５図は爆発行程側デコンプピンの斜視図、
第６図はクランク角度に対するカムリフトを示す
図、第７図および第８図は第２図のＣ−Ｃ線断面
図で第７図はエンジン始動時の動作説明図、第８
図はエンジンの通常回転時の動作説明図、第９図
は第１図の上面図、第１０図は本考案の第二実施
例を示す図である。１…カムシヤフト、２，３…吸気弁用および排
気弁用タペツト、４，５…吸気および排気カム、
６…カムギヤ、８，９…ピン孔、１０，１１…圧
縮行程側および爆発行程側デコンプピン、１５…
ウエイトレバー、３１，３２…圧縮行程側および
爆発行程側デコンプピン。 1 to 9 relate to the first embodiment of the present invention, FIG. 1 is a diagram of the end face of the cam gear, and FIG. 2 is a diagram of the first embodiment of the present invention.
3 is a sectional view taken along line BB in FIG. 1, FIG. 4 is a perspective view of the decompression pin on the compression stroke side, and FIG. 5 is a perspective view of the decompression pin on the explosion stroke side.
Fig. 6 is a diagram showing the cam lift with respect to the crank angle, Figs. 7 and 8 are cross-sectional views taken along the line C-C in Fig. 2, Fig. 7 is an explanatory diagram of the operation when starting the engine, and Fig. 8 is a diagram showing the cam lift relative to the crank angle.
The figure is an explanatory diagram of the operation of the engine during normal rotation, FIG. 9 is a top view of FIG. 1, and FIG. 10 is a diagram showing a second embodiment of the present invention. 1... Camshaft, 2, 3... Tappet for intake valves and exhaust valves, 4, 5... Intake and exhaust cams,
6... Cam gear, 8, 9... Pin hole, 10, 11... Compression stroke side and explosion stroke side decompression pin, 15...
Weight lever, 31, 32... Compression stroke side and explosion stroke side decompression pins.

Claims

[Scope of utility model registration request]

The end face of the cam gear in which the intake cam and the exhaust cam provided on the camshaft operate tappets to open and close the intake valve and the exhaust valve to the combustion chamber by the rotation of the camshaft which receives rotational force from the crankshaft through the cam gear. Compression stroke side and explosion stroke side pin holes are formed in the pin holes, and compression stroke side and explosion stroke side decompression pins having engagement portions on one side are rotatably inserted into the pin holes,
The ends of the decompression pin on the compression stroke side and the explosion stroke side on the anti-engaging part side are extended to the intake cam side or the exhaust cam side, or the intake cam and the exhaust cam side, and the ends of the decompression pin on the compression stroke side and the explosion stroke side are connected to each other. A notch is provided in a portion facing the end of the tappet so as to protrude and retract from the intake cam surface, exhaust cam surface, or intake cam surface and exhaust cam surface when the decompression pin rotates, while one end is provided on the end surface of the cam gear. A weight lever is provided which is pivotally mounted and whose other end side is engaged with each of the engaging portions, and the intake cam surface or the exhaust cam surface of the decompression pin end on the compression stroke side and the explosion stroke side due to the rotation of the weight lever; Alternatively, a decompression device for an engine is characterized in that the combustion chamber is brought into a semi-compressed state by protrusion from an intake cam surface and an exhaust cam surface, and the combustion chamber is brought into a fully compressed state by recessing.