JPH1122462A - Fan cover structure of internal combustion engine - Google Patents

Abstract

(57) [Problem] To facilitate cleaning of the inside of an engine cover and other maintenance work such as removal of dust and the like adhering and accumulating on a nearby component such as a fin of a cylinder of an internal combustion engine. SOLUTION: An upper half part 2a of a fan cover 2 divided into upper and lower parts and a top guard 8 attached to the upper surface of a cylinder cover 1 are connected and integrally formed, and are detachably mounted on an upper part of an internal combustion engine E. Become.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan cover structure for an internal combustion engine in which cleaning of the inside of a cover and other maintenance are easy.

[0002]

2. Description of the Related Art Conventionally, for example, a small air-cooled two-cycle internal combustion engine used in a portable work machine such as a brush cutter is
A cooling fan driven by a crankshaft of the internal combustion engine is provided to have an air-cooled cylinder having a cooling fin formed on an outer periphery thereof, in order to cool the cylinder and prevent overheating of components close to the cylinder. Have been.

[0003] The cooling fan is covered with a fan cover, and the cylinder portion is covered with a cylinder cover connected to the fan cover. The cooling fan is cooled by the fan cover and the cylinder cover. The wind is guided to the cylinder part to perform cooling.

In addition, even when the internal combustion engine is placed upside down on the upper surface of the cylinder cover at the time of cutting blade replacement or other maintenance, the spark plug or the like may be damaged by grounding or the like. There is a top guard so that there is no.

[0005]

In the internal combustion engine, the cooling air for cooling the cylinder, which is heated to a high temperature, simultaneously sucks in dust and the like, and the dust and the like contained in the cooling air are used for a long time. There is a problem in that the cooling air is gradually attached to and deposited on adjacent components such as the fins of the cylinder or an electronic ignition device, and the cooling air reduces the cooling effect of the cylinder due to the attached and deposited dust.

Therefore, in order to maintain the cooling effect of the cylinder by the cooling air, it is necessary to clean the inside of the cover of the internal combustion engine in a timely manner, such as to remove dust and the like adhering and accumulating on the fins of the cylinder. In such a case, in some cases, it is difficult to remove dust and the like without removing the fan cover and the entire cylinder cover.

However, the removal of the entire fan cover or the cylinder cover and the subsequent reattachment require a great deal of trouble.

The present invention has been made in view of the above circumstances, and has been made to facilitate cleaning of an engine portion, such as removal of dust adhered and deposited on adjacent parts such as cylinder fins or ignition coils, and other easy maintenance. It is an object of the invention to provide a fan cover structure for an internal combustion engine.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to an upper half part of a fan cover, which is divided into upper and lower parts, and a top guard attached to the upper surface of a cylinder cover. The top guard is preferably detachably mounted on the upper part of the internal combustion engine. Preferably, the detachable mounting of the fan cover integrally formed with the top guard on the upper part of the internal combustion engine is performed by screwing or fitting the top guard. This is a configuration made by the locking means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall perspective view of a forced air-cooled small two-stroke gasoline engine having a fan cover structure according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a main part of FIG. 1, and FIG. 3 is another embodiment. A longitudinal sectional view of the main part showing
FIG. 4 is a perspective view showing an example of a conventional internal combustion engine.

The conventional internal combustion engine E shown in FIG.
Cylinder cover 1, fan cover 2, air cleaner 3, diaphragm carburetor C, recoil starter 4, fuel tank 5, work implement components (for example, operation rod mounting portion of brush cutter) 6, spark plug 7, top guard 8 , An icing prevention kit 9, an exhaust muffler 19 and the like.

Further, as shown in FIG. 2, the internal combustion engine E has an air-cooled cylinder 11 having a plurality of cooling fins 10 formed on an outer periphery thereof. In order to prevent overheating of components such as the device 13, a fan 12 for forced cooling driven by a crankshaft (not shown) of the internal combustion engine E is provided.

Further, the periphery of the cylinder 11 is formed around the cylinder 11 in order to improve the cooling performance and ensure the safety of workers.
Covered with the cylinder cover 1,
Two parts are covered with the fan cover 2.

Further, as described above, the ignition plug 7 and the like are directly grounded on the upper surface of the cylinder cover 1 even when the internal combustion engine E is placed upside down at the time of cutting blade replacement or other maintenance. A top guard 8 for protecting the ignition plug 7 and the like is provided at an unequal height, which is attached as a separate component by a screw 14 or the like.

The icing prevention kit 9 is attached so as to cover a part of the leeward side of the cooling air discharge port provided on the outer peripheral surface of the cylinder cover 1 in a cold region or snowfall, The hot air after the cooling of the cylinder 11 is guided to the air intake of the vessel C to prevent the adhesion of frost generated near the air intake of the carburetor C and the suction of powdered snow.

The present invention relates to an internal combustion engine E having the above-described configuration.
1 and FIG. 2 show an embodiment of the fan cover structure.

In the present embodiment, first, the fan cover 2 for covering the fan 12 for forced cooling of the internal combustion engine E is vertically divided into two parts 2a and 2b. The divided upper half 2a and the top guard 8 fixed to the upper surface of the cylinder cover 1 of the internal combustion engine E are connected to each other, and are integrally formed by plastic injection molding or the like.

Specifically, conventionally, as shown in FIG.
Although the top guard 8 is formed as a separate component and is installed at an interval from the fan cover 2, in the present embodiment, the two members are maintained in the respective installation positions. , And are integrally formed by being connected by the connecting portion 15.

The upper half 2a of the fan cover 2 and the top guard 8, which are integrally formed, are detachably mounted on the upper part of the cylinder cover 1 of the internal combustion engine E.

As a simple method of detachably attaching an integral member of the upper half 2a of the fan cover 2 and the top guard 8 to the upper portion of the internal combustion engine E, the top guard 8 is attached to the same as before. There is a method of attaching to the upper surface of the cylinder cover 1 with the screw 14. That is, the screw hole 16 provided in the cylinder cover 1 and the through hole 17 provided in the top guard 8 may be adapted to be attached to the top of the cylinder 11 with the screw 14 in the related art.

Similarly, in order to make the upper half 2a of the fan cover 2 fixed so as to withstand the vibration of the internal combustion engine E, the lower end surface of the upper half 2a of the fan cover 2 is also required. It is preferable to provide an engaging projection 18a on the upper surface and an engaging recess 18b on the upper end surface of the lower half 2b of the fan cover 2 to engage with each other.

That is, after the engaging projection 18a and the engaging recess 18b are engaged, the top guard 8 may be attached to the upper surface of the cylinder cover 1 with the screw 14. As a result, the upper half 2a and the lower half 2b of the two-part fan cover 2 are completely connected to each other, so that vibrations and the like are reduced and there is no space between them. . In the figure, 23.23 is a positioning recess provided on the lower surface of the top guard 8 and fitted with a positioning projection (not shown).

In the above embodiment, the fan cover 2
The upper half 2a and the top guard 8 can be attached or detached to the upper surface of the cylinder cover 1, that is, the upper portion of the internal combustion engine E with one screw 14, so that the inside of the cover of the engine E can be cleaned and cleaned. No trouble is required for other maintenance.

In other words, during cleaning of the engine E and other maintenance, the mounting procedure is reversed, and the screw 14 for mounting the top guard 8 is simply removed. The portion 2a and the top guard 8 can be easily removed.

As a result, the upper half 2 of the fan cover 2
The portion a is largely opened, and the inside of the cover of the engine E such as the cylinder 11, the fan 12, and the electronic ignition device 13 is exposed to the outside, so that the engine E can be easily cleaned. Maintenance work can be easily performed.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals.

In this embodiment, the upper half 2a of the fan cover 2 and the top guard 8, which are integrally formed, are mounted on the upper portion of the engine E by fitting and locking without using the screws 14. Things.

That is, in this embodiment, a locking piece 8a having an L-shaped cross section is attached to the tip of the top guard 8 in advance.
A locking hole 1a is formed on the upper surface of the cylinder cover 1 for fittingly locking the locking piece 8a. The fan cover 2 has a U-shaped cross section at the lower inner surface of the upper half 2a. A locking connection portion 22b having an L-shaped cross section is provided on the inner surface of the upper end of the lower half portion 2b. In the figure,
Reference numeral 20 denotes an intermediate locking piece that is provided as needed to make the fixing more secure, and reference numeral 21 denotes a locking hole to which the intermediate locking piece 20 fits.

In this embodiment, the fan cover 2
In addition, since the top guard 8 is integrally formed of plastic, its deformation returning force (elasticity) is used.

That is, the upper half 2 of the fan cover 2
a, and once the distance between the lower end of the upper cover 2a and the locking piece 8a of the top guard 8 is manually reduced, the locking connecting portion 22a of the upper half 2a of the fan cover 2 and the lower half 2b of the fan cover 2 are locked. By engaging the connecting portion 22b, the intermediate locking piece 20 and the locking hole 21 are matched, and the locking piece 8a of the top guard 8 and the locking hole 1a of the cylinder cover 1 are matched. , Release your hand.

As a result, the upper half 2a of the fan cover 2 and the top guard 8 which are integrally formed are returned to their original shapes, and the locking connection portion 2 of the upper half 2a of the fan cover 2 is restored.
2a and the engagement connecting portion 22b of the lower half portion 2b, and the engagement piece 8a of the top guard 8 is engaged with the engagement hole 1a of the cylinder cover 1 to prevent withdrawal. It is securely fixed without loosening, and the installation is completed.

In this embodiment, the engagement between the locking connecting portion 22a of the upper half 2a of the fan cover 2 and the locking connecting portion 22b of the lower half 2b or the locking of the top guard 8 is performed. Piece 8a and locking hole 1a of cylinder cover 1
It must be possible to release the lock.

For this purpose, for example, when the lower end of the upper half 2a of the fan cover 2 is pressed inward, the locking connecting portion 22a is connected to the locking connecting portion of the lower half 2b of the fan cover 2. 22b, or when the formation portion of the locking piece 8a of the top guard 8 is pressed toward the fan cover 2, the locking piece 8a is easily removed from the locking hole 1a of the cylinder cover 1. In order to make the structure detachable, slits may be appropriately formed on both sides of the locking connecting portion 22b and the locking piece 8a.

[0034]

According to the present invention, the fan cover is divided into upper and lower parts, and the upper half thereof is detachable integrally with the top guard, so that cleaning of the inside of the cover of the internal combustion engine and other maintenance are easy. And the like.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a forced air-cooled small two-stroke gasoline engine having a fan cover structure according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of FIG.

FIG. 3 is a longitudinal sectional view of a main part showing another embodiment.

FIG. 4 is a perspective view showing an example of a conventional internal combustion engine.

[Explanation of symbols]

 E Internal combustion engine 1 Cylinder cover 1a Locking hole (fitting locking means) 2 Fan cover 2a Upper half 2b Lower half 8 Top guard 8a Locking piece (fitting locking means) 14 Screw 22a Locking connection (fitting connection Stopping means) 22b Locking connection part (fitting locking means)

Claims (3)

[Claims] 1. A fan cover (2) divided into upper and lower parts.
The upper half (2a) and a top guard (8) attached to the upper surface of the cylinder cover (1) are connected and integrally formed, and are detachably mounted on the upper part of the internal combustion engine (E). Of the internal combustion engine. 2. The detachable mounting of the upper half (2a) of the fan cover (2) integrally formed with the top guard (8) on the upper part of the internal combustion engine (E) includes the step of: 8. A fan cover structure for an internal combustion engine according to claim 1, wherein the screw is attached by a mounting screw. 3. The detachable mounting of the upper half (2a) of the fan cover (2) integrally formed with the top guard (8) on the upper part of the internal combustion engine (E) is performed by fitting and locking means. The fan cover structure for an internal combustion engine according to claim 1, wherein the fan cover structure is formed by (1aa, 8a, 22a, 22b).