JPS5928103Y2 - 2 cycle engine cylinder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a cylinder for a two-stroke engine.

Generally, the cylinder of a two-stroke engine has an exhaust hole 2, a first cleaning hole 3, and a cylinder 1, as shown in FIG.
A second scavenging hole 4, a third scavenging hole 5 that is separated from the second scavenging hole 4 and detoured to the rear side, and an intake hole 6 are arranged.

The cylinder 1 is fastened to the crankcase by fastening bolts 8 passing through bosses 1 provided at the four corners.

In that case, the tightening bolts 8 are arranged so that they can be tightened with uniform force from the four corners, so the width of the intake hole 6 is limited to the positions of the rear left and right tightening bolts 8, and cannot be made larger. Intake air volume cannot be obtained and high output cannot be obtained.

This invention has been improved in view of these points, and an embodiment of the invention shown in FIGS. 2 and 3 will be described below.

There are exhaust holes 2 around the cylinder 1, similar to the conventional example.
, a third scavenging hole 3, a second scavenging hole 4, a third scavenging hole 5 and an intake hole 6 which are separated from the second scavenging hole 4 and detoured to the rear side.

Accordingly, in the present invention, the width of the intake hole 6 in the direction perpendicular to the cylinder axis is widened to the left and right, so that the rear left and right fastening bolts 8 pass through the inside left and right sides of the intake hole 6.

Note that a gasket 9 is used to tighten the tightening bolt 8.

The front left and right tightening bolts 8 pass through the boss T.

The effect will be explained.

The tightening bolts 8 can be arranged in a well-balanced manner at the four corners, and the cylinder 1 can be tightened to the crankcase with uniform force.

The width of the intake hole 6 is made wide enough to allow the rear right and left tightening bolts 8 to pass through the inside thereof, so that the intake resistance is small, the amount of intake air can be increased, and the engine output can be improved.

As explained above, this idea widens the horizontal width of the intake hole opening into the cylinder in the direction orthogonal to the cylinder axis, and places a part of the stud bolt that fastens the cylinder to the crankcase inside the intake hole. This allows the intake hole to be enlarged by widening it, reducing intake resistance while maintaining a well-balanced position of the tightening bolts at the four corners and tightening the cylinder to the crankcase with uniform force. Since the intake amount can be increased, the engine output can be improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing a conventional example, FIGS. 2 and 3 are a cross-sectional side view of an embodiment of the present invention, FIG. 2 is a cross-sectional plan view, and FIG. 3 is a vertical cross-sectional side view. 1...Cylinder, 6...Intake hole, 8...
...Tightening bolt.

Claims (1)

[Scope of utility model registration request] In a two-stroke engine cylinder, in which the cylinder is fastened to the crankcase with a stud bolt, the width of the intake hole opening in the cylinder in the direction perpendicular to the cylinder axis is widened left and right, and the stud bolt is used to fasten the cylinder to the crankcase. A cylinder for a two-stroke engine, characterized in that a portion of the bolt passes through the intake hole.