JPH0240904U

JPH0240904U -

Info

Publication number: JPH0240904U
Application number: JP12079488U
Authority: JP
Priority date: 1988-09-14
Filing date: 1988-09-14
Publication date: 1990-03-20
Anticipated expiration: 2003-09-14
Also published as: JP2516075Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す要部断面図、
第２図は第１図の要部のみを示した平面図、第３
図は第１図のエンジン構造の概念的機構図、第４
図は従来の同種エンジンの第１図同様の要部断面
図、第５図は第４図のエンジン構造の概念的機構
図、第６図は第１図及び第４図のエンジン構造に
共通の弁配置を示す平面図である。１０……シリンダブロツク；１２……シリンダ
；１４……シリンダヘツド；１６……排気弁；１
８ａ，１８ｂ及び１８ｃ……吸気弁；２０……排
気側ロツカシヤフト；２２……排気側ロツカアー
ム；２６ａ，２６ｂ及び２６ｃ……第１、第２及
び第３吸気側ロツカアーム；３０……排気カム；
３４ａ，３４ｂ及び３４ｃ……吸気カム；３８…
…燃焼室；４６……カム軸；５０ａ，５０ｂ及び
５０ｃ……ロツカアーム支点。 FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention;
Figure 2 is a plan view showing only the main parts of Figure 1;
The figure is a conceptual mechanical diagram of the engine structure in Figure 1, and Figure 4.
The figure is a sectional view of the main parts of a conventional engine of the same type as in Figure 1, Figure 5 is a conceptual mechanical diagram of the engine structure in Figure 4, and Figure 6 is a common engine structure in Figures 1 and 4. It is a top view showing valve arrangement. 10... Cylinder block; 12... Cylinder; 14... Cylinder head; 16... Exhaust valve; 1
8a, 18b and 18c...Intake valve; 20...Exhaust side rocker shaft; 22...Exhaust side rocker arm; 26a, 26b and 26c...First, second and third intake side rocker arm; 30...Exhaust cam;
34a, 34b and 34c...Intake cam; 38...
...Combustion chamber; 46...Camshaft; 50a, 50b and 50c...Rocker arm fulcrum.

Claims

[Scope of utility model registration request]

One or more exhaust valves and three intake valves provided in each cylinder are configured to be opened and closed, respectively, controlled by exhaust cams and intake cams provided on a single camshaft, and the above three The valve shaft end of the central intake valve of the intake valves is brought into contact with the other end of a first rocker arm whose one end is pivoted on a fulcrum disposed closer to the cylinder center than the axis of the camshaft, and The valve shaft ends of the two intake valves on both sides abut the other ends of second and third rocker arms, each of which has one end pivoted on a fulcrum located on the cylinder outer peripheral side from the camshaft axis. An engine structure characterized in that the intake cam is configured to abut intermediate points of the first to third rocker arms, respectively.