JPS6231706U

JPS6231706U -

Info

Publication number: JPS6231706U
Application number: JP12159985U
Authority: JP
Priority date: 1985-08-09
Filing date: 1985-08-09
Publication date: 1987-02-25

Description

[Brief explanation of the drawing]

第１図は本考案による吸排気弁駆動装置の一実
施例を示す断面図、第２図ａ乃至第２図ｃは第１
図に示した調節機構の作動を説明するための一部
拡大断面図、第３図は第１図に示した装置のカム
リフト線図、第４図は本考案による吸排気弁駆動
装置の他の実施例を示す断面図である。１，４１…吸排気弁駆動装置、３…バルブ駆動
カム、１１，４２…調節機構、１２，４４…フリ
ーピストン、１４，４５…プランジヤ、１４ｃ…
リード、１５，４７…油圧室、１９，４９…給油
孔、２７，５０…溢流孔、５３…電磁弁。 FIG. 1 is a sectional view showing one embodiment of the intake/exhaust valve drive device according to the present invention, and FIGS.
FIG. 3 is a cam lift diagram of the device shown in FIG. 1, and FIG. 4 is a partial enlarged cross-sectional view for explaining the operation of the adjustment mechanism shown in FIG. It is a sectional view showing an example. DESCRIPTION OF SYMBOLS 1, 41... Intake and exhaust valve drive device, 3... Valve drive cam, 11, 42... Adjustment mechanism, 12, 44... Free piston, 14, 45... Plunger, 14c...
Lead, 15, 47... Hydraulic chamber, 19, 49... Oil supply hole, 27, 50... Overflow hole, 53... Solenoid valve.

Claims

[Scope of utility model registration request]

It has a valve drive cam that rotates in synchronization with the rotation of the internal combustion engine, and causes the intake and exhaust valves to reciprocate according to the rotation of the valve drive cam, and also controls the opening and closing of the valve between the valve drive cam and the intake and exhaust valve. In an internal combustion engine intake/exhaust valve drive device comprising an adjustment mechanism for adjusting timing and valve stroke amount, the adjustment mechanism includes a cylinder and a valve drive cam that is slidably fitted into the cylinder. a plunger that is reciprocated in the cylinder by a free piston, and a free piston that is slidably disposed within the cylinder and is linked to the intake and exhaust valves so that a hydraulic chamber is formed between the working end side of the plunger. , an oil supply hole formed in the circumferential wall of the cylinder so that oil can be supplied from the outside into the hydraulic chamber, and a one-way valve means that allows oil to pass only in the direction of the hydraulic chamber; an oil supply means for supplying oil into the hydraulic chamber through an oil supply hole; an overflow hole formed in the peripheral wall of the cylinder so that oil in the hydraulic chamber can escape to the outside; and the overflow hole. 1. An intake/exhaust valve drive device for an internal combustion engine, characterized in that it comprises a closing means for stopping oil outflow from the valve at a desired timing.