JPS61202611U

JPS61202611U -

Info

Publication number: JPS61202611U
Application number: JP8523385U
Authority: JP
Priority date: 1985-06-07
Filing date: 1985-06-07
Publication date: 1986-12-19

Description

[Brief explanation of the drawing]

第１図は本考案の動弁装置の一部切り欠き平面
図でロツカーアームは鎖線で示してあり、第２図
はシリンダヘツドの模式的平面図、第３図は第１
図の―線に沿つたシリンダヘツドの一部の垂
直断面図、第４図はトリツプ機構およびロツカー
アームを示す斜視図、第５図はロツク機構のロー
タを示し、ａはロータの側面をｂはロータの端面
を示し、第６図はロツク機構のラチエツトを表す
図でａはその端面をｂは側面を示し、第７図はロ
ータとラチエツトとの相対関係を示す模式図、第
８図はエンジン停止時の電磁式開閉弁の制御プロ
グラムの一例を示すフローチヤート、第９図はロ
ツカーアーム位置検出手段の変形例を示す。１８……ロツカーアーム、２０……ロツカーア
ームシヤフト、２２……カムシヤフト、２２……
カムシヤフト、４２……第１カム、４４……第２
カム、４６……摺動軸、７６……油圧ポンプ、８
０……ポンプ用カム、８２……ポンププランジヤ
、８５……制御回路、８８……電磁式開閉弁、９
４……ロツク機構、１１２……ロツカーアーム位
置検出センサ。 Fig. 1 is a partially cutaway plan view of the valve train of the present invention, in which the rocker arm is indicated by a chain line, Fig. 2 is a schematic plan view of the cylinder head, and Fig. 3 is a schematic plan view of the cylinder head.
4 is a perspective view showing the trip mechanism and rocker arm; FIG. 5 shows the rotor of the locking mechanism; Fig. 6 shows the end face of the lock mechanism, a shows the end face, b shows the side face, Fig. 7 is a schematic diagram showing the relative relationship between the rotor and the ratchet, and Fig. 8 shows the engine stopped. FIG. 9 is a flowchart illustrating an example of a control program for an electromagnetic on-off valve at the time of operation, and FIG. 9 shows a modification of the rocker arm position detection means. 18...Rotzker arm, 20...Rotzker armshaft, 22...Camshaft, 22...
Camshaft, 42...first cam, 44...second cam
Cam, 46...Sliding shaft, 76...Hydraulic pump, 8
0... Pump cam, 82... Pump plunger, 85... Control circuit, 88... Solenoid on-off valve, 9
4...Lock mechanism, 112...Rocker arm position detection sensor.

Claims

[Scope of Claim for Utility Model Registration] A Rocker arm that operatively engages an intake valve or an exhaust valve is attached to a Rocker arm shaft so as to be swingable and movable in the axial direction, and a camshaft that rotates in synchronization with an engine crankshaft. Two cams with different cam profiles are arranged adjacent to each other,
The rocker arm shaft is formed hollow, and a sliding shaft that interlocks with the rocker arm is installed in the rocker arm shaft so as to be slidable in the axial direction. and a second position in which the rocker arm engages the other cam, the sliding shaft is displaceable to switch the operating mode of the valve, and said sliding shaft is moved into said first position by spring means. A hydraulic actuator is provided, which is aligned with the sliding shaft and drives the sliding shaft toward the second position when switching the valve operation mode, and a ratchet is provided between the hydraulic actuator and the sliding shaft. A plunger driven by a pump cam provided on a camshaft is provided with a locking mechanism so that the sliding shaft is alternately locked in and released from the second position each time the hydraulic actuator is actuated. a hydraulic pump with a pump chamber connected to a hydraulic actuator;
In a variable valve operating mode valve operating system for an internal combustion engine, the discharge port of the hydraulic pump is opened and closed by an electromagnetic on-off valve controlled by a control circuit according to engine operating conditions, and means for detecting the position of the rocker arm. and the control circuit is configured to close the electromagnetic on-off valve when the engine speed is below a set value and the rocker arm is in the valve rest position. Valve mechanism.