JPH03118205U

JPH03118205U -

Info

Publication number: JPH03118205U
Application number: JP2768390U
Authority: JP
Priority date: 1990-03-20
Filing date: 1990-03-20
Publication date: 1991-12-06
Anticipated expiration: 2005-03-20
Also published as: JPH08483Y2

Description

[Brief explanation of drawings]

第１図は第２図の−線に沿う断面図、第２
図は第４図の動弁装置が適用されたシリンダヘツ
ドの部分平面図、第３図は第２図の−線に沿
う断面図、第４図はこの考案に係る４サイクルエ
ンジンの動弁装置の一実施例を示す斜視図、第５
図は第４図の動弁装置の平面図、第６図および第
７図は第４図の動弁装置の作用を示す動作状態図
、第８図は第４図のカムのカムプロフイールを示
す図、第９図および第１０図は第８図に示すカム
プロフイールのそれぞれの変形例を示す図である
。１，２……バルブ、３……低速用カム、４，５
……中高速用カム、７……低速用ロツカアーム、
８，９……中高速用ロツカアーム、１１……ロツ
カシヤフト、１２，１３……偏心ブツシユ、１５
……油圧シリンダ、１６……ラツク、１７……ピ
ニオン、２１……シリンダヘツド、Ａ……低速用
カムのカムプロフイール、Ｂ……中高速用カムの
カムプロフイール。 Figure 1 is a sectional view taken along the - line in Figure 2;
The figure is a partial plan view of a cylinder head to which the valve train shown in Figure 4 is applied, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a valve train for a four-stroke engine according to this invention. A perspective view showing an embodiment of the fifth embodiment.
The figure is a plan view of the valve train in Figure 4, Figures 6 and 7 are operating state diagrams showing the operation of the valve train in Figure 4, and Figure 8 is a cam profile of the cam in Figure 4. 9 and 10 are views showing respective modifications of the cam profile shown in FIG. 8. 1, 2... Valve, 3... Low speed cam, 4, 5
...cam for medium and high speeds, 7...rotsuka arm for low speeds,
8, 9...Mid-high speed rocker arm, 11...Rocker shaft, 12,13...Eccentric bush, 15
... Hydraulic cylinder, 16 ... Rack, 17 ... Pinion, 21 ... Cylinder head, A ... Cam profile of low speed cam, B ... Cam profile of medium and high speed cam.

Claims

[Scope of utility model registration request]

a rocker shaft rotatably supported and formed with an eccentric large diameter portion; a first rocker arm directly fitted into the rocker shaft; The second part inserted into the
and a third rocker arm, and a first rocker arm that drives the first, second, and third rocker arms, respectively.
, second and third cams, the second and third cams are formed with the same cam profile, the cam profile of the first cam is formed differently from the cam profile, and A valve drive for a four-stroke engine, characterized in that a rack connected to a rocker shaft rotation drive source that rotates the rocker shaft is engaged with a pinion formed at one end of the rocker shaft from above the cylinder head. Device.