JPS59190907U

JPS59190907U - Internal combustion engine valve drive device

Info

Publication number: JPS59190907U
Application number: JP8395383U
Authority: JP
Inventors: 須合　雄孝
Original assignee: 日産自動車株式会社
Priority date: 1983-06-03
Filing date: 1983-06-03
Publication date: 1984-12-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来例を示す図で、ａはシリンダヘッド部の断
面図、ｂは弁駆動装置の概要図、第２図は従来例の吸気
弁開閉タイミングを示す図、第３図は本考案の一実施例
図でアイドリング時および部分負荷運転時の作動状態を
示す一部切断した正面図、第４図はそのｘ−ｘ断面図、
第５図は本実施例の始動時および全開出力時の作動状態
を示す一部切断した正面図、第６図は本実施例の吸気弁
開閉タイミングを示す図、第７図は本実施例の吸気弁リ
フト曲線図、第８図は本考案の他の実施例図でアイドリ
ング時および部分負荷運転時の作動状態を示す一部切断
した正面図である。１・・・・・・カム軸、２−−−−−−カム、３・・・
・・・カムホロワ、４・・・・・田ツカアーム、５・・
・・・・ロッカ軸、６・・・・・・吸気弁、８・・・・
・・カムホロワの回動支点軸、９・・・・・・リターン
スプリング、１１・・・・・・アクチュエータ、１２・
・・・・・油圧室、１３・・・・・・リターンスプリン
グ、１４・・・・・・油通路、１５・・・・・・オイル
ポンプ、１６゜１７．１８・・・・・・制御手段（１６
・・・・・・油圧制御弁、１７・・・・・・センサ群、
１８・・・・・・電気的制御装置）１、Ｒ１，Ｒ２・・
・・・・カムホロワのカムとの接触面を構成する曲面の
曲率半径。Fig. 1 is a diagram showing a conventional example, where a is a cross-sectional view of the cylinder head, b is a schematic diagram of the valve drive device, Fig. 2 is a diagram showing the intake valve opening/closing timing of the conventional example, and Fig. 3 is a diagram of the present invention. FIG. 4 is a partially cutaway front view showing the operating state during idling and partial load operation in one embodiment, and FIG.
Fig. 5 is a partially cutaway front view showing the operating state of this embodiment at startup and full open output, Fig. 6 is a diagram showing the intake valve opening/closing timing of this embodiment, and Fig. 7 is a diagram of this embodiment. Intake valve lift curve diagram FIG. 8 is another embodiment of the present invention, which is a partially cutaway front view showing the operating state during idling and partial load operation. 1...camshaft, 2---cam, 3...
...Come follower, 4...Tatsuka arm, 5...
...Rocker shaft, 6...Intake valve, 8...
...Cam follower rotation fulcrum shaft, 9...Return spring, 11...Actuator, 12.
... Hydraulic chamber, 13 ... Return spring, 14 ... Oil passage, 15 ... Oil pump, 16゜17.18 ... Control Means (16
...Hydraulic control valve, 17...Sensor group,
18...Electrical control device) 1, R1, R2...
...The radius of curvature of the curved surface that makes up the contact surface with the cam of the cam follower.

Claims

[Scope of utility model registration request]

In a valve drive device for an internal combustion engine using a rocker arm having a cam follower and a cam, the contact surface of the cam follower on the rocker arm that drives the intake valve with the cam is composed of two curved surfaces with different radii of curvature, and the cam follower is connected to the rocker arm. The cam follower is mounted so that it can rotate about a fulcrum shaft parallel to the cam shaft, and the actuator that rotates the cam follower contacts the cam of the cam follower after the maximum lift point of the intake valve depending on the engine operating conditions. A valve drive device for an internal combustion engine, comprising a control means for operating the actuator so as to change the curvature of the surface.