JPH024940U

JPH024940U -

Info

Publication number: JPH024940U
Application number: JP8227488U
Authority: JP
Priority date: 1988-06-23
Filing date: 1988-06-23
Publication date: 1990-01-12

Description

[Brief explanation of drawings]

第１図は従来の２サイクルエンジンのシリンダ
部を示す縦断面図、第２図はその排気口の正面図
、第３図は本考案による２サイクルエンジンのシ
リンダ部を示す縦断面図、第４図は第３図の―
線に沿う断面図、第５図は第３図の―線に
沿う断面図である。１……シリンダ、２……シリンダブロツク、３
……排気通路、４……排気口、５……掃気口、６
……吸気口、７……ピストン、８……小溝、９…
…隔壁。 FIG. 1 is a vertical sectional view showing the cylinder section of a conventional two-stroke engine, FIG. 2 is a front view of its exhaust port, FIG. 3 is a longitudinal sectional view showing the cylinder section of the two-stroke engine according to the present invention, and FIG. The diagram is from Figure 3.
FIG. 5 is a cross-sectional view taken along the line -- in FIG. 3. 1...Cylinder, 2...Cylinder block, 3
...Exhaust passage, 4...Exhaust port, 5...Scavenging port, 6
...Intake port, 7...Piston, 8...Small groove, 9...
...bulkhead.

Claims

[Claims for Utility Model Registration] (1) In a two-stroke engine in which an exhaust port is opened on the inner peripheral surface of the cylinder and scavenging ports are opened on both sides of the exhaust port, the upper edge of the exhaust port on the inner peripheral surface of the cylinder A two-stroke engine characterized in that at least two small grooves communicating with the upper edge are formed at adjacent positions and spaced apart in the circumferential direction. (2) The two-stroke engine according to claim 1, wherein the small grooves are formed on both sides of a circumferential center point of the upper edge of the exhaust port and are spaced apart from each other.