JPS62137314U

JPS62137314U -

Info

Publication number: JPS62137314U
Application number: JP2497686U
Authority: JP
Priority date: 1986-02-22
Filing date: 1986-02-22
Publication date: 1987-08-29
Also published as: JPH0437208Y2

Description

[Brief explanation of drawings]

第１〜５図は本考案の一実施例としてのエンジ
ンのタイミング可変式給排気用バルブ機構を示す
もので、第１図はその要部を模式的に示す正面図
、第２図はその要部を模式的に示す横断面図、第
３図はその要部の作動状態を示す模式的正面図、
第４図はその要部の作動状態を示す模式的横断面
図、第５図はその作動を示すグラフであり、第６
図は従来のオーバーヘツドバルブ式給排気用バル
ブ機構を示す模式図である。１……給排気用バルブ機構、２……プツシユロ
ツド、３……タペツト、４……バルブ駆動用カム
、５……第１のアーム、６……第１の駆動機構、
７……第２のアーム、８……第２の駆動機構、９
……第１の偏心シヤフト、１０……第１の回転駆
動手段、１１……第２の偏心シヤフト、１２……
第２の回転駆動手段、１３，１３′……回転中心
、１４，１５……揺動中心、１６……係合点、１
７，１８……ローラ、２７……ロツカアーム、２
８……バルブステム、２９……ロータ。 Figures 1 to 5 show a variable timing intake/exhaust valve mechanism for an engine as an embodiment of the present invention. Figure 1 is a front view schematically showing its main parts, and Figure 2 is its main parts. Fig. 3 is a schematic front view showing the operating state of the main parts;
Fig. 4 is a schematic cross-sectional view showing the operating state of the main parts, Fig. 5 is a graph showing the operation, and Fig. 6 is a graph showing the operation.
The figure is a schematic diagram showing a conventional overhead valve type supply/exhaust valve mechanism. DESCRIPTION OF SYMBOLS 1... Valve mechanism for supply and exhaust, 2... Push rod, 3... Tappet, 4... Valve drive cam, 5... First arm, 6... First drive mechanism,
7...Second arm, 8...Second drive mechanism, 9
...First eccentric shaft, 10...First rotational drive means, 11...Second eccentric shaft, 12...
Second rotational drive means, 13, 13'... Rotation center, 14, 15... Swing center, 16... Engagement point, 1
7, 18...Roller, 27...Lotsuka arm, 2
8... Valve stem, 29... Rotor.

Claims

[Scope of utility model registration request]

The engine is equipped with an overhead valve type supply/exhaust valve mechanism, which consists of a push rod, a tappet attached to the lower end of the push rod, and a valve drive cam disposed below the tappet. a first arm having a distal end interposed between the lower surface of the tappet and the circumferential surface of the cam in order to change the valve opening timing or valve closing timing of the valve mechanism; a first drive mechanism capable of driving the first arm so as to bias the engagement point between the first arm and the circumferential surface of the cam by a required amount in the advance direction;
a second arm that is arranged parallel to the arm in the thickness direction of the cam and has a tip interposed between the lower surface of the tapepet and the circumferential surface of the cam; a second drive mechanism capable of driving the second arm so as to deviate the point of engagement with the circumferential surface by a required amount in the retard direction, and the first drive mechanism drives the first arm. The second drive mechanism includes a first eccentric shaft that is pivotally supported, and a first rotational drive means that rotationally drives the first eccentric shaft by a required amount.
a second eccentric shaft for pivotally supporting an arm; and a second rotational drive means for rotationally driving the second eccentric shaft by a required amount; The center of rotation by the means and the center of rotation of the second eccentric shaft by the second rotation driving means are arranged so as to align, and the center of the first eccentric shaft and the center of the second eccentric shaft are aligned. 1. A variable timing intake/exhaust valve mechanism for an engine, characterized in that the valve mechanism is disposed at a position facing the center of rotation and sandwiching the center of rotation.