JPS6233946Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover structure for an exhaust part of an engine used mainly for a portable working machine such as a brush cutter.

In this type of engine, a cord extending from the magnet coil to the outside of the engine body is bent at the top of the cylinder and connected to the spark plug. For this reason, it is installed in, for example, brush cutters.
When in use, the bent portion of the spark plug cord may get caught on a tree branch or the like, causing it to become disconnected from the spark plug, causing the engine to stop inadvertently.

The present invention was developed based on the above circumstances, and focused on the point that the bent part of the ignition hydrant cord is located near the top of the muffler cover, and by partially improving the muffler cover, the above-mentioned ignition hydrant cord It is an object of the present invention to provide a cover structure for an exhaust part of an engine that can accommodate a bent part and prevent catching from the outside.

Hereinafter, the present invention will be explained in detail based on the illustrated embodiments. In the figure, reference numeral 1 denotes a crankcase, which has a front case member 1a at the front and a rear case member 1b at the rear.A mounting flange 1c is formed on the front edge of the front case member 1a, and a rear case member 1b is provided at the front edge of the front case member 1a. A scroll portion 1d is provided at the rear of the scroll portion 1d, and a cooling air inlet 1e is opened at the front side of the scroll portion 1d. Furthermore, a recoil starter 2 equipped with a starting operation handle 2a is arranged on the front side of the crankcase 1. An engine cylinder 3 is provided above the crankcase 1, and the cylinder 3 has a large number of heat dissipation fins 3a formed on the outside of the cylinder wall 3b, and a combustion chamber 3.
The heat generated by the combustion of the air-fuel mixture inside c can be released to the outside by air cooling. An exhaust pipe 3d is integrally formed on the left side of the cylinder 3 (the right side when viewed from the back as shown in FIGS. 2 and 3), and an exhaust passage 3e therein opens into the inner wall of the cylinder. It communicates with the inside of the cylinder 3 via the exhaust port 3f. A piston (not shown) is reciprocated up and down within the cylinder 3, and a crankshaft connected to the piston via a connecting rod is disposed within the crankcase 1 as is known in the art. A fan wheel 4 which also serves as a flywheel is provided on the crankshaft, and a fan cover 5 is attached to the back of the engine so as to surround this fan wheel 4. The fan cover 5 is provided with a mounting seat 5a for connecting to a working machine (not shown). Further, a guard 5b for a spark plug is integrally formed on the top of the fan cover 5, and a cylinder cover 6 having an air exhaust port 6a is attached to the front of the cylinder 3. Furthermore, a bulge 6b is formed at the top of the cylinder cover 6 to cover and protect the ignition plug mounting portion. Further, reference numeral 7 denotes a fuel tank attached to the waist of the engine, its fuel inlet is located on one side of the front, and a cap 7a is detachably attached. Further, a stand 8 made of a plate material is attached to the lower part of the engine. A spark plug 9 is attached to the top of the cylinder 3, and a spark plug 9 is attached to the top of the cylinder 3.
A muffler 13 is mounted on the left side in FIG. 3 and communicates with the exhaust passage 3e, and a cutting opening 6c corresponding to the exhaust passage 3e is provided in the cylinder cover 6.

In the present invention, the muffler cover 14 that covers the muffler 13 has a slit 14a formed on its circumferential surface, and an exhaust port 14b that corresponds to the opening of the tail pipe 13a of the muffler 13 on the side surface. Rather, a protective cover 14d that protects the bent portion 11a of the spark plug cord 11 is integrally formed above the storage chamber 14c in which the muffler 13 is stored. The storage chamber 14e constituted by the protective cover 14d includes the bent portion 11a.
is accommodated to prevent snagging from the outside. A mounting bracket 6d having a hook-shaped tip is attached to one side of the upper part of the cylinder cover 6, and is adapted to be engaged with an engagement hole 14f formed at the top of the muffler cover 14. There is. Note that the spark plug cord 11 is connected to the cylinder cover 6.
It enters the cover 6 through a grommet 12 into a hole provided in the cylinder cover 6, and is electrically connected to a magnet coil 10 provided inside the cylinder cover 6.

Further, the muffler cover 14 has a U-shaped jetty 14g formed at the front and rear sides, and a tongue piece 14j formed by a pair of notches 14h on the inside thereof. A stop protrusion 14k is formed, which can be engaged with the engagement hole 1f provided in the flange part 1c on the front part, and by engaging with the engagement hole 1f provided on the flange part 1c on the rear part. 5d to the above jetty 14
By engaging the locking protrusion 14k with the engagement hole 5e formed in the tongue piece 5c while being received in the crankcase 1 and the fan cover 5 integrally combined therewith. Connected. To remove the muffler cover 14, push the top of the locking protrusion 14k into each of the engaging holes 1f, 5e, insert the engaging portion 14l into the muffler cover 14, and engage with the engaging holes 1f, 5e. All you have to do is release it and pull it away from the engine. After the engagement on the lower side is released, the mounting fitting 6d is removed from the engagement hole 14f.

In such a configuration, the muffler cover 14 is provided with the protective cover 14d, and the bent portion 11a of the spark plug cord 11 is accommodated in the storage chamber 14e that is independent of the storage chamber 14c that stores the muffler 13. The bent portion 11a of the cord 11 will not be caught from the outside, and there is no possibility that the connection with the ignition plug 9 will be disconnected. Further, the storage chamber 14e is the storage chamber 1
4c, and the thermal influence of the muffler 13 can be avoided.

Moreover, since the protective cover 14d is constructed integrally with the muffler cover 14, it can be constructed without increasing the number of parts or assembly man-hours, and without requiring extra expense.

As a result, when using this engine for work such as mowing, it is possible to avoid situations where the cord comes off from the ignition plug and the engine is inadvertently stopped, and it is also possible to prevent the cord from being pulled out of the muffler or other places in the exhaust gas. Practical effects such as being able to safely hold the cord without causing accidents such as short circuits due to melting of the coating by contacting the cord can be obtained.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a rear view of the same, FIG. 3 is an enlarged rear view with a part of the back surface cut away, FIG. 4 is a view taken along the line X-X in FIG. 3, and FIG. 5 is a Y- Y-line arrow sectional view, No. 6
The figure is a sectional view taken along the Z-Z line in FIG. 4, and FIG. 7 is an enlarged side view of the engaging portion. 3...Engine cylinder, 3d...Exhaust pipe, 1
3...muffler, 14...muffler cover, 14c...
...Storage chamber, 14d...Protective cover, 14e...Accommodation chamber, 11...Ignition plug cord, 11a...Bending portion.

Claims (1)

[Scope of utility model registration request] In a muffler cover that covers a muffler attached to an exhaust part of an engine cylinder, the muffler cover is integrally provided with a protective cover part having a housing chamber independent of a storage chamber in which the muffler is stored, and A cover structure for an exhaust part in an engine, characterized in that when the muffler cover is attached to the engine side to cover the muffler, a bent part of the spark plug cord is housed in the housing chamber.