JPH0231550Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an engine cover for a small two-stroke engine.

FIG. 1 is a front view showing a conventional small two-stroke engine, and FIG. 2 is a view taken along the arrow in FIG. In the figure, 1 is a cylinder, 2 is a muffler cover, 3 is an insulator, 4 is a carburetor, 5 is an air cleaner, 6 is a cylinder cover, 7 is a fan case, 8
is a fuel tank, and 9 is a recoil starter.

A small two-stroke engine equipped with the above-mentioned components is designed to have a lightweight and compact structure as a whole, so exterior parts such as the muffler cover 2, cylinder cover 6, and air cleaner 5 are placed in the center of the engine as much as possible. Although these components are grouped together in close proximity to each other, each of these components has its own unique function and is therefore formed separately. Therefore, these parts inevitably suffer from the disadvantages of high cost and increased assembly man-hours.

In addition, if foreign matter such as dust becomes clogged between the fins of the cylinder 1 on the side of the fan case 7 to which a working machine (not shown) is connected, it is not enough to simply remove the fan case 7 to remove the foreign matter; ,
It was necessary to remove the brush cutter itself.

The purpose of the present invention is to provide an engine cover that eliminates the above-mentioned drawbacks, and is characterized by a part that covers the outer periphery of the air cleaner, carburetor, muffler, and cylinder, and an upper end near the bottom of the cylinder. The engine cover is formed by integrally molding the part that is connected to the upper end of the fan case that opens and forms a smooth cooling air passage wall to the cylinder with a plate material such as sheet metal or heat-resistant resin. At least a cooling wind exhaust window, a carburetor adjustment window,
A hole facing the muffler exhaust port, a heat dissipation louver from the muffler, and a spark plug protrusion hole are provided, and the cover is detachably attached to the engine body from the cylinder neck direction. .

Embodiments of the present invention will be described below with reference to the drawings.

3 is a front view showing an engine cover according to an embodiment of the present invention, FIG. 4 is a view taken in the direction of the arrow in FIG. 3, and FIG. 6 is a view taken in the direction of the arrows in FIG. 5, and FIG. 7 is a view taken in the direction of the arrows in FIG.

In the figure, 1 is a cylinder, 8 is a fuel tank,
9 is a recoil starter.

Reference numeral 11 denotes an engine cover, which is integrally molded from sheet metal or heat-resistant resin, and covers parts such as an air cleaner (not shown), a muffler (not shown), a carburetor 19, and a cylinder 1, and extends from a fan case 13 (described later) to the cylinder 1. It covers the part forming the cooling air passage wall of the cylinder 1, and is fixed at the upper part of the cylinder 1 with screws 12, etc.
etc. are jointly tightened. Note that it is connected to the fan case 13 through a smooth shape so that the movement of the cooling air is not obstructed.

The part of the fan case 13 that faces the cylinder 1 is removed, that is, the part that forms the cooling air passage wall from the fan case to the cylinder is removed, and is fixed to the main case 15 with screws 14 or the like, and the lower end 16 of the main case 15 is removed. has an engine stand function.

Reference numeral 17 denotes a window, which is formed so that the cooling air that has passed through the cylinder 1 can escape. Reference numeral 18 denotes an adjustment window, which is formed so as to be able to operate an adjustment screw of the carburetor 19 and a choke lever. Reference numeral 20 denotes a hole, which is formed to face an exhaust port of a muffler (not shown).
A plurality of louvers 21 are formed to dissipate heat. 22 is a square hole formed to allow the carburetor 19 to protrude. Reference numeral 24 denotes a protruding hole for a spark plug, which is provided in a portion of the cover 11 corresponding to the cylinder neck portion.

The functions and effects of the above configuration will be described.
Conventionally, cylinder covers, muffler covers, air cleaners, etc. were each separate and their assembly methods were carried out separately, but the exterior parts were integrally molded using sheet metal or heat-resistant resin, and the (In the case of FIG. 5, the upper part) can be assembled and removed much more easily, so that a remarkable effect can be achieved in reducing parts costs and assembly man-hours.

Also, if dust gets clogged between the fans on the fan case 13 side of the cylinder 1, the fan case 13
Cleaning becomes easy by removing only the engine cover 11 without removing it.

Note that the engine cover 11 is attached to the fan case 13.
Instead of tightening the engine cover 11 together with the starter case 23 and the fan case 13, the engine cover 11 may be held between the starter case 23 and the fan case 13. At this time, the upper part of the engine cover 11 may be fixed to the cylinder 1 with screws 12 or the like, or may not be fixed.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional small two-stroke engine, FIG. 2 is a view taken along the arrow in FIG. 3, FIG. 5 is a side view showing the engine equipped with the engine cover shown in FIG. 3, FIG. 6 is a view shown in the direction of the arrow in FIG. 5, FIG. FIG. 8 is a view taken along the arrows in FIG. 1...Cylinder, 11...Engine cover, 1
3...Fan case.

Claims (1)

[Scope of utility model registration request] A part that surrounds and covers the outer periphery of the air cleaner, carburetor, muffler, and cylinder, and a part that is connected to the upper end of the fan case whose upper end opens near the bottom of the cylinder and forms a smooth cooling air passage wall to the cylinder. An engine cover is formed by integrally molding a sheet material such as sheet metal or heat-resistant resin, and the cover has at least a cooling air exhaust window, a carburetor adjustment window, a hole facing the muffler exhaust port, and heat dissipation from the muffler. A small two-stroke engine characterized in that a louver and a spark plug protruding hole are provided, and the cover is detachably attached to the engine body from the top of the cylinder.