JPS6188009U

JPS6188009U -

Info

Publication number: JPS6188009U
Application number: JP17408184U
Authority: JP
Priority date: 1984-11-16
Filing date: 1984-11-16
Publication date: 1986-06-09

Description

[Brief explanation of the drawing]

第１図〜第７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図はその縦断面図、第２図はその平面
図、第３図はそのドラム部およびストツパを示す
断面図、第４図は第３図の円板状部材の正面図、
第５図は第４図の側面図、第６図は負圧式アクチ
ユエータの断面図、第７図はバルブリフト特性を
示すグラフ、第８図はこの考案の第２実施例を示
す断面図、第９図および第１０図はこの考案の第
３実施例を示す図であり、第９図はその要部正面
図、第１０図は第９図の−矢視図、第１１図お
よび第１２図は従来の内燃機関の吸・排気弁リフ
ト制御装置を示す図であり、第１１図はその縦断
面図、第１２図はそのバルブリフト特性を示すグ
ラフである。１１……吸・排気弁駆動カム、１２……吸・排
気弁、１３……ロツカアーム、１５……レバー、
２０……リフト制御カム、２１……カム制御軸、
３５……リターンスプリング、３９Ａ，３９Ｂ…
…ストツパ、５１……負圧式アクチユエータ。 1 to 7 are diagrams showing a first embodiment of the intake/exhaust valve lift control device for an internal combustion engine according to this invention, in which FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view showing the drum part and stopper, FIG. 4 is a front view of the disc-shaped member in FIG. 3,
Fig. 5 is a side view of Fig. 4, Fig. 6 is a sectional view of the negative pressure actuator, Fig. 7 is a graph showing valve lift characteristics, Fig. 8 is a sectional view showing the second embodiment of this invention, 9 and 10 are views showing a third embodiment of this invention, FIG. 9 is a front view of the main part thereof, FIG. 10 is a view taken along the - arrow in FIG. 9, and FIGS. 11 and 12. 1 is a diagram showing a conventional intake/exhaust valve lift control device for an internal combustion engine, FIG. 11 is a longitudinal sectional view thereof, and FIG. 12 is a graph showing its valve lift characteristics. 11... Suction/exhaust valve drive cam, 12... Suction/exhaust valve, 13... Locker arm, 15... Lever,
20... Lift control cam, 21... Cam control shaft,
35...Return spring, 39A, 39B...
...Stopper, 51... Negative pressure actuator.

Claims

[Scope of utility model registration request]

The curved back surface of the rocker arm, whose both 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 and changing the rocking position of the lever, the fulcrum position where the lever contacts the rocker arm is changed, and the intake/exhaust valves are controlled. A variable intake/exhaust valve lift mechanism that variably controls lift characteristics, a negative pressure actuator that rotates a cam control shaft inserted through the lift control cam against the biasing force of a return spring using negative engine intake pressure, and a cam. An intake/exhaust valve lift for an internal combustion engine, comprising a stop means for stopping rotation of the cam control shaft when the control shaft is rotated to a predetermined position by the biasing force of a negative pressure actuator or a return spring. Control device.