JPH021406U

JPH021406U -

Info

Publication number: JPH021406U
Application number: JP7827888U
Authority: JP
Priority date: 1988-06-15
Filing date: 1988-06-15
Publication date: 1990-01-08

Description

[Brief explanation of drawings]

第１図は本考案の第１実施例を示す縦断面図、
第２図及び第３図は開弁期間可変機構を示す拡大
断面図で第２図は開弁時を示す図、第３図は閉弁
時を示す図、第４図は第２図のＢ部拡大図、第５
図は制御ロツド制御装置を示す図、第６図は第１
実施例の動作説明図、第７図は給気弁及び排気弁
の開弁期間を示す図、第８図はクランク角と弁リ
フト量の関係を示す線図、第９図は第２実施例を
示す縦断面図、第１０図は第３実施例を示す縦断
面図である。５…給気ポート、６…排気ポート、７…給気弁
弁座、８…排気弁弁座、９…給気弁、１０…排気
弁、２２…マスク壁、５０，５１…開弁期間可変
機構。 FIG. 1 is a longitudinal sectional view showing the first embodiment of the present invention;
Figures 2 and 3 are enlarged cross-sectional views showing the variable valve opening period mechanism. Figure 2 is a diagram showing when the valve is open, Figure 3 is a diagram when it is closed, and Figure 4 is B of Figure 2. Enlarged view of section, 5th
The figure shows the control rod control device.
An explanatory diagram of the operation of the embodiment, Fig. 7 is a diagram showing the opening period of the intake valve and exhaust valve, Fig. 8 is a diagram showing the relationship between the crank angle and the valve lift amount, and Fig. 9 is the second embodiment. FIG. 10 is a longitudinal sectional view showing the third embodiment. 5... Air supply port, 6... Exhaust port, 7... Air supply valve valve seat, 8... Exhaust valve valve seat, 9... Air supply valve, 10... Exhaust valve, 22... Mask wall, 50, 51... Valve opening period variable mechanism.

Claims

[Scope of utility model registration request]

an annular ring which is constantly biased toward the rear surface of the air supply valve or exhaust valve bulk portion and is pressed against the rear surface of the air supply valve or exhaust valve bulk portion until the lift amount of the air supply valve or exhaust valve reaches a predetermined lift amount; A mask wall is slidably disposed on an air supply port or an exhaust port, and when the lift amount of the air intake valve or exhaust valve is less than or equal to a predetermined lift amount, the mask wall provides a space between the air intake valve or exhaust valve and each valve seat. The formed opening is closed, and when the lift amount of the air supply valve or exhaust valve exceeds the predetermined lift amount, the mask wall moves away from the back surface of the air supply valve or exhaust valve bulk part and opens the opening. A two-stroke internal combustion engine.