JPH041608U

JPH041608U -

Info

Publication number: JPH041608U
Application number: JP4184490U
Authority: JP
Priority date: 1990-04-19
Filing date: 1990-04-19
Publication date: 1992-01-08

Description

[Brief explanation of the drawing]

第１図乃至第１１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図はロツカーシヤフト内の貫通
穴を示す縦断面図、第１０図はバルブの開閉動作
時にロツカーシヤフトに作用する最大荷重方向を
示す概略構成図、第１１図はロツカーシヤフトに
作用する荷重方向と荷重の大きさとの関係を示す
特性図、第１２図は他の実施例を示す要部の横断
面図、第１３図乃至第１６図は切換え操作機構の
一例を示すもので、第１３図は連結ピンが収容位
置で保持されている状態を示す要部の縦断面図、
第１４図は第１３図の−線断面図、第１
５図は連結ピンがロツカーアームの係合穴に係合
された状態を示す要部の縦断面図、第１６図は第
１５図の−線断面図である。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、
１６ａ，１６ｂ……バルブ、２０……低速用カム
、２１……高速用カム、２２……カムシヤフト、
３１……連結ピン、３２……貫通穴、４２……係
合穴。 Figures 1 to 11 show one embodiment of this invention. Figure 1 is a schematic diagram of the main parts of the valve timing adjustment device, and Figure 2 shows 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 vertical cross-sectional view showing the through hole in the rocker shaft, Figure 10 is a schematic configuration diagram showing the direction of the maximum load acting on the rocker shaft during valve opening/closing operations, and Figure 11 is the relationship between the direction of the load acting on the rocker shaft and the magnitude of the load. FIG. 12 is a cross-sectional view of the main part of another embodiment, FIGS. 13 to 16 are examples of the switching operation mechanism, and FIG. 13 shows the connecting pin in the housed position. A vertical cross-sectional view of the main parts showing the state in which they are maintained;
Figure 14 is a sectional view taken along the line -1 in Figure 13.
FIG. 5 is a longitudinal cross-sectional view of the main part showing a state in which the connecting pin is engaged with the engaging hole of the rocker arm, and FIG. 16 is a cross-sectional view taken along the line -- in FIG. 15. 11...Rotsuker shaft, 13...Rotsuker arm for low speed, 14...Rotsuker arm for high speed,
16a, 16b...Valve, 20...Low speed cam, 21...High speed cam, 22...Camshaft,
31... Connection pin, 32... Through hole, 42... Engagement hole.

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 rotation, wherein the low-speed rocker arm and the high-speed rocker arm A rocker shaft is provided in which one of the rocker arms is fixed and the other rotatably mounted, and an engagement hole is provided in the joint surface of the rocker arm rotatably mounted to the rocker shaft, and the Through holes are respectively formed at positions corresponding to the engagement holes, and the screws are installed so as to be able to protrude and retract from a housing position accommodated in the through holes to a protrusion position protruding toward the engagement hole, and at the protrusion position, the A connecting pin is provided in the engagement hole so as to be removably engaged to switch the rocker shaft and the rotatable rocker arm into a connected state, and is aligned in the direction of the load acting on the rocker shaft during the opening/closing operation of the valve. A valve timing adjustment device characterized in that the direction of the center line of the through hole is set by the direction of the center line of the through hole.