JPS6451709U

JPS6451709U -

Info

Publication number: JPS6451709U
Application number: JP14747187U
Authority: JP
Priority date: 1987-09-29
Filing date: 1987-09-29
Publication date: 1989-03-30

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例における内燃機関の
閉弁時期可変装置の閉弁時期変更前の正断面図、
第２図は第１図のＡ―Ａ方向の側断面図、第３図
は第１図のＢ―Ｂ方向の側断面図、第４図は第１
図の閉弁時期変更後の正断面図、第５図は第１図
の装置の油圧室への油圧操作配置側断面図、第６
図は本考案を適用した内燃機関の低負荷領域にお
けるＰ―Ｖ線図、第７図は本考案を適用した内燃
機関の高負荷領域におけるＰ―Ｖ線図、第８図は
本考案と従来例とを比較するためのＰ―Ｖ線図、
第９図は従来の内燃機関のＰ―Ｖ線図である。１…カム軸、３…油圧ポンプ、１２ａ，１２ｂ
…油通路、１１ａ…固定カム、１１ｂ…回転カム
、１３…キー、１４…回転羽根、１５…固定羽根
、１６…ガイドフレーム、２１ａ，２１ｂ，２２
ａ，２２ｂ…油圧室。 FIG. 1 is a front sectional view of a variable valve closing timing device for an internal combustion engine according to an embodiment of the present invention before changing the valve closing timing;
Figure 2 is a side cross-sectional view taken along the line A--A in Figure 1, Figure 3 is a side cross-sectional view taken along the line B-B in Figure 1, and Figure 4 is the side cross-sectional view taken along the line A-A in Figure 1.
Figure 5 is a front sectional view after changing the valve closing timing, Figure 5 is a side sectional view of the hydraulic operation arrangement in the hydraulic chamber of the device in Figure 1,
The figure shows a PV diagram in the low load range of an internal combustion engine to which the present invention is applied, Figure 7 is a PV diagram in the high load range of an internal combustion engine to which the present invention is applied, and Figure 8 shows the present invention and the conventional PV diagram for comparison with examples,
FIG. 9 is a PV diagram of a conventional internal combustion engine. 1...Camshaft, 3...Hydraulic pump, 12a, 12b
...Oil passage, 11a... Fixed cam, 11b... Rotating cam, 13... Key, 14... Rotating blade, 15... Fixed blade, 16... Guide frame, 21a, 21b, 22
a, 22b...hydraulic chamber.

Claims

[Scope of utility model registration request]

A two-part cam consisting of a fixed cam fixed to the camshaft and a rotating cam that can rotate around the camshaft using the fixed cam as a guide is provided, and the direction of the rotating cam can be varied by hydraulic pressure using the fixed cam as a fulcrum. A variable valve closing timing device for an internal combustion engine, in which a hydraulic chamber capable of rotating the valve is disposed within the two-part cam.