JPH0442495Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dust prevention device applied to a small air-cooled engine.

[Conventional technology]

FIG. 3 is an external view of a conventional engine, and FIG. 4 is a sectional view of the main parts of the engine.

1 is the recoil starter and screw 2 connects the wind guide plate 3
A cooling air intake port 1a is provided on the outer periphery of the recoil starter 1. Reference numeral 4 denotes a recoil pulley which is fastened together with a flywheel 6 to a crankshaft 7 by a nut 5. The plate 8 is attached to the recoil pulley 4 by spot welding or the like.

Next, the operation of the conventional example will be explained.

When the crankshaft 7 rotates and the flywheel 6 attached to it rotates, the air guide plate 3 becomes under negative pressure due to the action of the wind fan attached to the flywheel 6. Therefore, the cooling air flows through the cooling air intake port 1a.
At the same time, foreign matter such as grass is sucked into the baffle plate 3, but this suctioned foreign matter is repelled by the plate 8 rotating at high speed and released from the engine through the cooling air inlet 1a. ,
It is configured so that only cooling air flows into high temperature parts such as the finned cylinder.

[Problem that the invention attempts to solve]

However, in the structure of the conventional example, the window of the cooling air intake port 1a does not have an outlet (cooling air intake port 1a) in the direction in which foreign matter is repelled by the plate 8, and each
Since the cooling air intake ports 1a are small and their total area is also small, there is a problem that foreign objects that are repelled by the plate 8 are difficult to come out due to reasons such as the high speed of inflow of the cooling air. It was hot. In addition, as seen in Utility Model Publication No. 57-6766, the side of the recoil starter 1 that meets the air guide plate 3 is hollowed out at several points on the circumference to form gaps between it and the air guide plate.
A means of using this as a cooling air inlet hole is also provided, but in this case, the area of the cooling air inlet hole cannot be made large enough, and the rigidity of the recoil starter 1 is reduced, and the strength is insufficient to withstand the starting torque. There was also the problem that it was not possible to obtain

The purpose of the present invention is to solve the problems of the conventional device described above, and to easily release foreign matter (grass, etc.) that has entered the air guide plate, thereby preventing foreign matter from clogging the cylinder fins etc. of the air-cooled engine and causing overheating. to provide dustproof equipment.

[Means for solving problems]

The present invention was developed in order to solve the above-mentioned problems, and the part of the mating surface of the wind guide plate and the recoil starter, excluding the screw-fastening boss part of the wind guide plate to which the recoil starter is attached, is made into a concave shape. A feature is that a gap 13a is provided between the recoil starter and the baffle plate.

[Effect]

Since a gap is provided in the direction in which foreign matter is repelled by the plate 8, and the total area of the cooling air intake portion is increased, the cooling air inflow speed is reduced, making it easier to discharge foreign matter outside the baffle plate.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is an external view of the engine according to the present invention, and FIG. 2 is a sectional view of the main parts thereof.

In the figure, a recoil starter 1 is attached to a baffle plate 13 with screws 2, and a cooling air intake port 1a is provided on the outer periphery of the recoil starter 1. On the mating surface of the recoil starter 1 and the baffle plate 13, the portion excluding the screwed boss portion of the baffle plate to which the recoil starter 1 is attached is made concave,
Gap 1 between recoil starter 1 and baffle plate 13
3a is provided. This gap 13a constitutes a second cooling air intake as shown in FIG. It is designed so that it can be discharged. The recoil pulley 4 is fastened together with the flywheel 6 to the crankshaft 7 by a nut 5, and the plate 8 is attached to the recoil pulley 4 by spot welding or the like.

Next, the operation of the above embodiment will be explained.

When the crankshaft 7 rotates and the flywheel 6 attached to it rotates, the inside of the air guide plate 13 becomes negative pressure, and at the same time, the cooling air enters from the cooling air intake ports 1a and 13a, and at the same time, foreign objects are also drawn into the air guide plate 13. Get into it. Foreign matter that has entered the air guide plate 13 is repelled by the plate 8, and the cooling air intake ports 1a, 13
Only the cooling air is discharged to the outside from a and flows to high-temperature parts such as cylinders, and there is no risk of foreign matter clogging the fins or the like and causing the engine to overheat.

Although a vertical engine has been described above, the present invention is also applicable to a horizontal engine.

[Effect of idea]

Since the present invention is constructed as described above, foreign objects that have entered the baffle plate can be easily released without impairing the rigidity of the recoil starter side, and foreign objects (grass, etc.) can clog the cylinder fins and cause the engine to overheat. do not have. In addition, since the recess formed by hollowing out a part of the mating surface of the comparatively robust baffle plate is used as the cooling air intake, it is similar to the conventional recoil starter side that is hollowed out and used as the cooling air intake. There is no concern about a decrease in the rigidity of the starter, and it has sufficient strength.

[Brief explanation of drawings]

Figures 1 and 2 are related to the present invention; Figure 1 is an external view of the engine, Figure 2 is a sectional view of the same main part, Figure 3 is an external view of a conventional engine, and Figure 4 is a cross-sectional view of the main part. It is a diagram. 1... Recoil starter, 13... Wind guide plate, 1
3a...Gap.

Claims (1)

[Scope of utility model registration request] In an air-cooled engine equipped with a recoil starter in which a plate for discharging foreign matter is attached to a recoil pulley, a first cooling air intake port is bored on the outer periphery of the recoil starter, and a recoil plate on which the recoil starter is attached is installed. A dust prevention device for an air-cooled engine, characterized in that a recess is provided in a portion outside the plate on the mating surface with the starter, and a second cooling air intake is formed between the recess and the mating surface of the recoil starter.