JPS628310U

JPS628310U -

Info

Publication number: JPS628310U
Application number: JP9918485U
Authority: JP
Priority date: 1985-06-28
Filing date: 1985-06-28
Publication date: 1987-01-19

Description

[Brief explanation of the drawing]

第１図Ａ，Ｂ，Ｃ〜第４図はこの考案に係る内
燃機関の吸・排気弁駆動装置の一実施例を示すも
のであり、第１図Ａは、その縦断面図、第１図Ｂ
はその要部平面図、第１図Ｃはリフト制御カムの
取付部を示すその分解斜視図、第２図はリフト制
御カムのカム面の回動を説明するための説明図、
第３図はリフト制御カムに作用するトルクを示す
グラフ、第４図はリフト制御カムの係止部にコイ
ルスプリングの一端が係止されている状態を示す
図、第５図Ａ，Ｂはこの考案の他の実施例を示し
た図であり、第５図Ａはその要部平面図、第５図
Ｂはカム制御軸の円筒部を示すその側面図、第６
図は従来の内燃機関の吸・排気弁駆動装置を示す
その縦断面図である。１１……駆動カム、１２……吸・排気弁、１３
……ロツカアーム、１３ａ……背面、１５……レ
バー、１７……シリンダヘツド（機関本体）、２
０……リフト制御カム、２０ｉ……係止部、２３
……カム制御軸、２４……コイルスプリング（弾
性部材）。 1A, B, C to 4 show an embodiment of the intake/exhaust valve drive device for an internal combustion engine according to this invention, and FIG. 1A is a vertical sectional view thereof, and FIG. B
1C is an exploded perspective view showing the attachment part of the lift control cam, and FIG. 2 is an explanatory diagram for explaining the rotation of the cam surface of the lift control cam.
Figure 3 is a graph showing the torque acting on the lift control cam, Figure 4 is a graph showing one end of the coil spring being locked in the locking part of the lift control cam, and Figures 5A and B are graphs showing this state. 5A is a plan view of the main part thereof, FIG. 5B is a side view showing the cylindrical part of the cam control shaft, and FIG. 6 is a diagram showing another embodiment of the invention.
The figure is a longitudinal sectional view showing a conventional intake/exhaust valve drive device for an internal combustion engine. 11... Drive cam, 12... Intake/exhaust valve, 13
...Rocker arm, 13a...Back, 15...Lever, 17...Cylinder head (engine body), 2
0... Lift control cam, 20i... Locking part, 23
...Cam control shaft, 24...Coil spring (elastic member).

Claims

[Scope of utility model registration request]

The curved back surface of the rocker arm, whose ends engage with the intake/exhaust valve drive cam and the stem ends of the intake/exhaust valves, is brought into fulcrum contact with a lever that is swingably attached to the engine body along the back surface. By controlling the amount of rotation of the lift control cam engaged with one end of the lever by the rotation of the cam control shaft and changing the swinging position of the lever, the fulcrum position where the lever and the rocker arm contact is changed. The internal combustion engine is equipped with an elastic member that connects the lift control cam and the cam control shaft by engaging a locking portion formed on the lift control cam or the cam control shaft. In the intake/exhaust valve drive device for an internal combustion engine, the locking portion is provided with a predetermined gap that causes play in the elastic member when torsion torque is applied to the elastic member. Exhaust valve drive device.