JPH03108809U

JPH03108809U -

Info

Publication number: JPH03108809U
Application number: JP12733489U
Authority: JP
Priority date: 1989-10-31
Filing date: 1989-10-31
Publication date: 1991-11-08

Description

[Brief explanation of drawings]

第１図は本考案のエンジンの弁タイミング及び
リフト制御装置の一実施例を示す側面図、第２図
は同実施例の平面図、第３図及び第４図は夫々作
動状態の異なる同実施例の縦断面図、第５図は同
実施例における弁タイミング及びリフト特性図で
ある。１……ロツカアーム、２……エンジン、３……
吸気弁、４……シリンダヘツド、５……ピボツト
、８……低速用油圧タペツト、９……高速用油圧
タペツト、１０，１０ａ……プランジヤ、２４，
２４ａ，２５，２５ａ……給油口、２６，２６ａ
……排出口、２７…切換弁、２８……シリンダ室
、２９……給油路、３０……高速側送油口、３１
……低速側送油口、３３……低速側戻し口、３２
……高速側戻し口、３９，４０，４１，４２……
連通路、５０……カム軸、５１……低速用カム、
５２……高速用カム。 Fig. 1 is a side view showing one embodiment of the engine valve timing and lift control device of the present invention, Fig. 2 is a plan view of the same embodiment, and Figs. 3 and 4 are the same embodiment in different operating states. FIG. 5, which is a longitudinal sectional view of the example, is a valve timing and lift characteristic diagram in the same example. 1...Rotsuka arm, 2...engine, 3...
Intake valve, 4... Cylinder head, 5... Pivot, 8... Hydraulic tappet for low speed, 9... Hydraulic tappet for high speed, 10, 10a... Plunger, 24,
24a, 25, 25a... Fuel filler port, 26, 26a
...Discharge port, 27...Switching valve, 28...Cylinder chamber, 29...Oil supply path, 30...High speed side oil supply port, 31
...Low speed side oil feed port, 33...Low speed side return port, 32
...High speed side return port, 39, 40, 41, 42...
Communication path, 50... cam shaft, 51... low speed cam,
52...High speed cam.

Claims

[Scope of utility model registration request]

In a valve drive mechanism in which a cam operates a valve via a rocker arm, the same number of hydraulic tappets as the cams have different contact points with the plurality of cams;
A valve timing and lift control device for an engine, characterized in that a switching valve for switching oil supply to each hydraulic tappet according to engine oil pressure is embedded in the rocker arm.