JPH03127006U

JPH03127006U -

Info

Publication number: JPH03127006U
Application number: JP1990033577U
Authority: JP
Priority date: 1990-03-31
Filing date: 1990-03-31
Publication date: 1991-12-20

Description

[Brief explanation of drawings]

第１図乃至第１３図はこの考案の一実施例を示
すもので、第１図はバルブタイミング調整装置の
要部の概略構成図、第２図は低速用ロツカーアー
ムおよび高速用ロツカーアームの取付け状態を示
す縦断面図、第３図は第２図の−線断面図、
第４図は第２図の−線断面図、第５図は第２
図の−線断面図、第６図は連結ピンを示す斜
視図、第７図は高速用ロツカーアームとロツカー
シヤフトとの連結状態を示す縦断面図、第８図は
同横断面図、第９図は動弁系駆動トルクとエンジ
ン回転数との関係を示す特性図、第１０図はエン
ジンフリクシヨンとエンジン回転数との関係を示
す特性図、第１１図はエンジン全開トルクとエン
ジン回転数との関係を示す特性図、第１２図はバ
ルブのリフト動作時の動作特性を示す特性図、第
１３図はカムの凹み曲面部分の製造状態を示す概
略構成図、第１４図はスリツパ式のロツカーアー
ムを示す概略構成図、第１５図はローラ式のロツ
カーアームを示す概略構成図である。１１……ロツカーシヤフト、１３……低速用ロ
ツカーアーム、１４……高速用ロツカーアーム、
１７……転動ローラ、２０……低速用カム、２１
……高速用カム、２２……カムシヤフト、２９…
…摺接部。 Figures 1 to 13 show an embodiment of this invention, with Figure 1 being a schematic diagram of the main parts of the valve timing adjustment device, and Figure 2 showing the installation state of the low-speed rocker arm and the high-speed rocker arm. Fig. 3 is a longitudinal sectional view shown in Fig. 2,
Figure 4 is a sectional view taken along the - line in Figure 2, and Figure 5 is a cross-sectional view of Figure 2.
6 is a perspective view showing the connecting pin, FIG. 7 is a vertical sectional view showing the connection state between the high-speed rocker arm and the rocker shaft, FIG. 8 is a cross-sectional view of the same, and FIG. A characteristic diagram showing the relationship between valve train drive torque and engine speed, Figure 10 is a characteristic diagram showing the relationship between engine friction and engine speed, and Figure 11 is a relationship between full-throttle engine torque and engine speed. Figure 12 is a characteristic diagram showing the operating characteristics during valve lift operation, Figure 13 is a schematic configuration diagram showing the manufacturing state of the concave curved surface portion of the cam, and Figure 14 shows a slipper type rocker arm. FIG. 15 is a schematic diagram showing a roller type rocker arm. 11...Rotsuker shaft, 13...Rotsuker arm for low speed, 14...Rotsuker arm for high speed,
17...Rolling roller, 20...Low speed cam, 21
...High-speed cam, 22...Camshaft, 29...
...Sliding contact part.

Claims

[Claims for Utility Model Registration] A low-speed cam and a high-speed cam are mounted on a camshaft, and the low-speed cam drives a low-speed rocker arm, and the high-speed cam drives a high-speed rocker arm, respectively. In the low-speed rotation range of the engine, the low-speed rocker arm opens and closes the valves provided in the valve train of the engine according to the rotation of the low-speed cam, and in the high-speed rotation range of the engine, the high-speed cam is driven to open and close. A valve timing adjustment device provided with a switching operation mechanism that switches between the low-speed rocker arm and the high-speed rocker arm so that the high-speed rocker arm opens and closes the valve according to the rotation, wherein the low-speed rocker arm is connected to the low-speed rocker arm. A valve timing adjusting device characterized in that a rolling roller is provided in contact with the high-speed cam, and a sliding contact portion is provided in the high-speed rocker arm to make sliding contact with the high-speed cam.