JPS6261910U

JPS6261910U -

Info

Publication number: JPS6261910U
Application number: JP15492985U
Authority: JP
Priority date: 1985-10-09
Filing date: 1985-10-09
Publication date: 1987-04-17
Also published as: JPH0326246Y2

Description

[Brief explanation of the drawing]

第１図〜第４図はこの考案に係る内燃機関の吸
・排気弁リフト制御装置の第１実施例を示す図で
あり、第１図は吸・排気弁リフト可変機構を示す
その縦断面図、第２図はその要部平面図、第３図
はそのリフト制御カムの取付部の分解斜視図、第
４図はコイルスプリングとその係止部とを示す分
解斜視図、第５図は比較例を示す斜視図、第６図
Ａ，Ｂは比較例の作用を説明する各作用説明図、
第７図Ａ，Ｂはこの実施例の作用を説明する各作
用説明図、第８図〜第１０図はこの考案の第２実
施例を示す図であり、第８図はその吸・排気弁リ
フト可変機構を示すその縦断面図、第９図はその
油圧ピボツトを示す断面図、第１０図はコイルス
プリングの取付部を示す分解斜視図、第１１図Ａ
，Ｂはこの考案の第３実施例を示す図であり、第
１１図Ａはコイルスプリングの取付部を示す分解
斜視図、第１１図Ｂはその要部断面図、第１２図
は従来の内燃機関の吸・排気弁リフト制御装置を
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、２０ｈ……円筒部、２０
ｉ……溝（係止部）、２３……カム制御軸、２４
……コイルスプリング（弾性部材）、２９……ホ
ルダ（支持部材）、２９ａ……溝（係止部）。 1 to 4 are diagrams showing a first embodiment of an intake/exhaust valve lift control device for an internal combustion engine according to this invention, and FIG. 1 is a longitudinal sectional view showing a variable intake/exhaust valve lift mechanism. , Fig. 2 is a plan view of the main parts, Fig. 3 is an exploded perspective view of the attachment part of the lift control cam, Fig. 4 is an exploded perspective view showing the coil spring and its locking part, and Fig. 5 is a comparison. A perspective view showing an example, FIGS. 6A and 6B are action explanatory diagrams explaining the action of a comparative example,
7A and 7B are operation explanatory diagrams for explaining the operation of this embodiment, and FIGS. 8 to 10 are diagrams showing a second embodiment of this invention, and FIG. 8 is an illustration of the intake/exhaust valve. FIG. 9 is a longitudinal cross-sectional view showing the variable lift mechanism, FIG. 9 is a cross-sectional view showing the hydraulic pivot thereof, FIG. 10 is an exploded perspective view showing the mounting portion of the coil spring, and FIG. 11A
, B are views showing a third embodiment of this invention, FIG. 11A is an exploded perspective view showing the mounting part of the coil spring, FIG. 11B is a sectional view of the main part, and FIG. 12 is a conventional internal combustion engine. FIG. 2 is a longitudinal sectional view showing an engine intake/exhaust valve lift control device. 11... Drive cam, 12... Intake/exhaust valve, 13
...Rocker arm, 13a...Back, 15...Lever, 17...Cylinder head (engine body), 2
0...Lift control cam, 20h...Cylindrical part, 20
i...Groove (locking part), 23...Cam control shaft, 24
... Coil spring (elastic member), 29 ... Holder (supporting member), 29a ... Groove (locking part).

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 cam control shaft and changing the swinging position of the lever, the fulcrum position where the lever and the rocker arm come into contact is changed and suction is performed. - In an intake/exhaust valve lift control device for an internal combustion engine configured to variably control the lift characteristics of an exhaust valve, a cylindrical portion formed protruding from the lift control cam and a support member provided on the cam control shaft each have a While forming locking portions, a portion of both ends of the elastic member are restrained to the cylindrical portion and the support member by a predetermined angle, and both ends are locked so that a bending moment acts uniformly on each locking portion, An intake/exhaust valve lift control device for an internal combustion engine, characterized in that a lift control cam and a cam control shaft are connected via the elastic member.