JPH0248683Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylinder cover that is connected to a fan cover that covers a fan and covers the top of a cylinder.

Conventionally, air generated by an engine fan is guided to the side of the cylinder by a fan cover and a cylinder cover connected to the fan cover to cool the cylinder. Inside this fan cover, a coil that generates electricity in correspondence with a magnetic foil that rotates together with the fan is installed in the air passage, and dust contained in the air is transferred to and from this coil. It adhered to the fins of the opposing cylinders, impeding the cooling effect of the air blower. This adhering dust required cleaning without removing the entire cylinder cover from the engine, which made cleaning work troublesome.

In addition, the spark plug is provided protruding from the cylinder, and conventionally the cylinder cover was provided to cover the spark plug, so there was a large amount of wasted space in areas other than the spark plug, and it was difficult to replace the spark plug. This was troublesome, and since the ignition cord connecting to the spark plug passed through the inside of the cylinder cover, there was a risk that the insulation material would deteriorate due to its proximity to the hot cylinder.

Furthermore, in the case of a brush cutter, when the machine body was turned upside down to replace the cutting blade, the engine could not be stably placed on the ground.

The present invention improves the above-mentioned drawbacks, and eliminates the need to attach and detach the entire cylinder cover, which is troublesome to remove, and removes only the cover, allowing the coil to easily collect dust and the cylinder facing the coil to be removed. The fins of the aircraft can be easily cleaned, the spark plugs can be easily replaced, the ignition cord can be prevented from deteriorating due to heat, and the engine can be kept stable on the ground when the aircraft is turned over. The aim is to provide a cylinder cover that can be placed on the cylinder cover.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is the engine crankcase 3
It is a cylinder fixed to the upper part of the cylinder, and has fins 4, 4, . . . on its outer periphery, and a piston 5 is slidably fitted inside. Reference numeral 7 denotes a crankshaft rotatably supported by the crankcase 3, with cranks 9, 9 fixed to the center, and a magnetic foil 11 at one end.
is fixed thereto, and a recoil starter device 13 for starting is provided at the other end. A connecting rod 15 has an upper end pivotally connected to the piston 5 by a piston pin 17, and a lower end pivotally connected to a crank pin 19 fixed to the cranks 9, 9. Reference numeral 21 denotes a centrifugal clutch provided on the outer surface of the magnetic foil 11, and when the rotational speed exceeds a predetermined value, the shoe 23 comes into contact with a clutch drum 25 provided outside due to centrifugal force and transmits power to the transmission shaft 27. It is. 29 is a fan provided inside the magnetic foil 11. 3
Reference numeral 1 denotes an electromotive coil installed close to the top of the magnetic foil 11, which generates a primary current in response to a magnet (not shown) embedded in the outer periphery of the magnetic foil 11, and which is further sensitive to this primary current. This generates a secondary current, which discharges and ignites the spark plug 33. A fan cover 35 covers the fan 29 and the electromotive coil 31, and is fixed to the fan case 38, which is connected to the crankcase 3 by bolts 36, 36. 37 short-circuits the primary circuit of the electromotive coil 31 and connects the spark plug 33.
This is a switch for stopping the ignition of the fan cover 35, and is fixed to the top surface of the fan cover 35. 39 is a fuel tank provided below the crankcase 3, 41 is a carburetor communicating with the intake port 43, 45 is an air cleaner, and 47 is a throttle wire. 49 is a wiring for stopping ignition, 51 is an ignition cord connecting the electromotive coil 31 and the spark plug 33, and 53 is a muffler communicating with the exhaust port 55. 57 is screw 5
The cylinder cover is fixed to the cylinder 1 by 9.61 and is provided to cover the top and sides of the cylinder 1. 63 is an opening provided in the cylinder cover 57 at a position close to the electromotive coil 31 in the fan cover 35, and 64 is a plug hole that opens at the position of the ignition plug 33 in the cylinder cover 57 and through which the ignition plug 33 passes. be. 65 is a lid portion that covers the opening 63 and the top of the protruding spark plug 33;
7 and 59, it is removably fixed. Reference numeral 69 denotes an air guide portion fixed to the lid portion 65, and is formed in a shape to guide the air from the fan 29 to the outer periphery of the cylinder 1.

The ignition cord 51 is connected from the electromotive coil 31 to the opening 6
3 and the inside of the lid 65 to be connected to the top of the spark plug 33.

Reference numeral 71 denotes a leg portion protruding from the upper surface of the lid portion 65, which supports the engine on the ground when the engine is turned upside down. Reference numeral 73 designates a sunken hole portion formed by cutting out the edge of the lid portion 65 on the side of the fan cover 35, and is used to accommodate and protect the ignition stop switch 37 provided at the top of the fan cover 35. 7
Reference numerals 5 and 75 designate air intake holes of the fan 29, which open into the fan case 38 of the crankcase 3. A muffler cover 77 is fixed to the cylinder cover 57 with screws 79, and is provided to cover the outer periphery of the muffler 53, and has ventilation holes 81, 81, . . . opened therein.

In the above embodiment, when the engine is started by the recoil starter device 13 and the rotational speed is increased, the shoe 23 of the centrifugal clutch 21 contacts the clutch drum 25 and the transmission shaft 27 is driven. The air generated by the fan 29 passes from the outer circumference of the electromotive coil 31 to the outer circumference of the cylinder 1, further passes through the outer circumference of the muffler 53, and is discharged to the atmosphere from the exhaust hole 81 of the muffler cover 77. It cools the cylinder 1 and muffler 53. A large amount of dust and the like contained in this air is deposited on the electromotive coil 31 and the fins 4, 4 of the cylinder 1 on the side facing the electromotive coil 31, but if the lid 65 is removed, the opening 63, this attached and accumulated dust can be easily removed.

According to the present invention, it is easy to clean dust adhering to the electromotive coil where dust tends to accumulate and the fin portion of the cylinder that faces the electromotive coil.
This makes it possible to prevent the cooling effect of the air from decreasing.

In addition, by making the spark plug pass through the plug hole and protrude outside the cylinder cover, the spark plug can be easily replaced, the cylinder cover can be made compact, and the heating of the ignition cord can be reduced. Preventing ignition cord damage,
In addition to preventing poor insulation, the lid is shaped to cover the spark plug, which prevents the spark plug from soaking even in the rain and causing ignition failure, and prevents workers from touching the spark plug with their hands. There is no risk of burns, and the spark plugs will not be damaged even when the engine is turned upside down and placed on the ground.

In addition, the lid is shaped to support the engine when it is turned upside down, so it protects the spark plug and prevents damage when replacing the mower blade with the engine turned upside down and placed on the ground. In addition, the engine can be stably placed on the ground, making it easier to replace the cutting blade.

In addition, as shown in scope (2) of the claim for utility model registration,
By forming an air guide part in a part of the lid part to guide air from the fan to the side of the cylinder, it is possible to provide an appropriately shaped air guide surface, and since it can be attached and removed together with the lid part, it is easy to clean when cleaning. Do not get in the way.

Furthermore, as stated in claim (3) for utility model registration, if a sinkhole is provided at one end of the lid and a switch for stopping the engine is accommodated in the sinkhole, the switch can be operated from either the left or right side. It can be easily installed on the top of the fan cover, and since the switch is protected by the cylinder cover, there is no risk of erroneous operation.

[Brief explanation of drawings]

1 and 2 are a side sectional view and a front sectional view, respectively, of an embodiment of the present invention, and FIGS. 3 and 4 are a plan view and a perspective explanatory view, respectively, of essential parts. Explanation of the symbols representing the main parts of the drawing, 1...
Cylinder, 29... Fan, 31... Electromotive coil, 33... Spark plug, 35... Fan cover, 37... Switch, 51... Ignition cord, 5
7... Cylinder cover, 63... Opening, 64
... Plug hole, 65 ... Lid section, 69 ... Wind guide section,
71... Leg part, 73... Sinkhole part.

Claims (1)

[Claims for Utility Model Registration] (1) In a cylinder cover 57 that is connected to a fan cover 35 that incorporates a fan 29 and an electromotive coil 31 and covers the top of the cylinder 1, the electromotive coil 31 of the cylinder cover 57
The electromotive coil 31 is opened at a position close to the electromotive coil 31.
an opening 63 for cleaning the spark plug 3;
A plug hole 64 through which the spark plug 33 passes is provided at position 3, and a lid 65 that covers the opening 63 and the top of the spark plug 33 is removably fixed to the cylinder cover 57;
The spark plug 33 passes through the opening 63
An ignition cord 51 connected to the engine is housed in the lid 65, and legs 71 are integrally formed on the top surface of the lid 65 to support the engine when the engine is turned upside down. A cylinder cover that is characterized by: (2) A part of the lid part 65 is provided with an air guiding part 6 for guiding the air blown by the fan 29 to the side surface of the cylinder 1.
9. The cylinder cover according to claim (1) of the utility model registration form. (3) A utility model registration claim (1) in which a sinkhole portion 73 is provided at one end of the lid portion 65, and a switch 37 for stopping ignition is housed in the sinkhole portion 73.
Cylinder cover as described in.