JPS5843614Y2 - Forced air-cooled engine with recoil starter - Google Patents

Description

[Detailed description of the invention] The present invention provides a recoil starter that is low in noise, lightweight, and has sufficient strength when installing a recoil starter on the outside of a cooling fan or installing a coil starter on a forced air-cooled engine with a coil starter. It was proposed for this purpose.

Conventionally, in a forced air-cooled engine with a recoil starter installed outside the cooling fan or with a coil starter, an air guide case that covers the cooling fan and one side of the engine cylinder is fixed to a part of the engine. The structure is such that the starter case of the recoil starter is fixed to the front side.

Therefore, during the starting operation, the operating force must be supported by the air guide case, and it is necessary to make the air guide case strong.

Therefore, the wind guide case becomes thick and relatively heavy, and for example, making even a portion of the case made of resin poses a problem in terms of durability.

Furthermore, since the center of the wind guiding case is not fixed, there is also the disadvantage that it is susceptible to noise due to vibrations from the engine.

In view of this, the present invention aims to achieve the above objectives.
It is characterized by the fact that the wind guide case and starter case are fixed together in multiple places using a support installed upright on the engine body.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 is a front view, Figure 2 is a cross-sectional view along the line ■-■,
Reference numeral 1 indicates the engine as a whole.

As shown in FIG. 2, a starting shaft 3 made of the front end of a crankshaft projects from the front side of a crankcase 2 of this engine 1, and a cooling fan 5 is formed integrally with a flywheel 4 on this starting shaft 3. is fixed externally.

The cooling fan 5 and the air guide case 7 that covers the front side of the cylinder 6 of the engine 1 are desirably made of synthetic resin.

When synthetic resin is used, it may be reinforced with reinforcing fibers or the like, or may not contain any special reinforcing material.

The air guide case 7 is fixed to the front end wall 8 of the crankcase 2.

The air guide case 7 has an insertion port 9 opened in front of the cooling fan 5, which also serves as an intake port for sucking cooling air.

Since this insertion hole 9 is formed to have a larger diameter than the starter pulley 11 of the recoil starter 10, the starter pulley 11 of the recoil starter 10
1 is inserted through this insertion hole 9 and connected to the tip of the starting shaft 3 located inside the air guide case 7.

In this example, the starter pulley 11 is connected to the starting shaft 3 via the cooling fan 5, but the air guiding case 7 can be removed from or attached to the engine 1 in this state.

An end portion of the wind guiding case 7 that projects forward from the insertion opening 9 of the starter pulley 11 is covered with a starter case 12 .

The starter case 12 also serves as a dustproof cover that covers the insertion opening 9, and is fixed to a starter case mounting portion 13 provided around the insertion opening 9 of the wind guide case 7.

A support 15 made of iron plate is run across the attachment part 14 of the air guide case 7 to the engine 1 and the starter case attachment part 13 of the air guide case 7.

In this example, as shown in FIGS. 3 and 4, the support 15
is located inside the wind guide case 7, but the support 15
may be embedded inside the air guide case 7 (see FIG. 4), or may be placed along the outer surface of the air guide case 7.

Furthermore, another annular reinforcing plate surrounding the insertion opening 9 may be added, or this may be integrated with the support 15 of this example.

As explained above, the present invention has a starting shaft protruding from one side of the crankcase of a forced air-cooled engine, a cooling fan is fixed to this starting shaft, and the wind from the cooling fan is guided to the cylinder. An air guide case is placed on one side of the engine while covering the cooling fan, an insertion hole is opened in the air guide case at -IU of the cooling fan, and the tip of the starting shaft is inserted into the insertion hole. The starter pulley is formed to a size that allows insertion of the starter pulley of the recoil starter connected to the recoil starter, and the end of the starter pulley that protrudes one inch outward from the insertion opening is covered with a starter case, and the starter case and the air guide case are connected to each other. and are fastened together to the outer end of the support installed on the engine body at multiple locations around the insertion port, so that the starting operation force that is transmitted to the air guide case through the starter cover during the starting operation is reduced. This provides sufficient strength to prevent damage to the wind guide case caused by starting operations.

Therefore, the wind guide case can be made thinner or made of resin, and its weight can be reduced.

Furthermore, since the air guide case is fastened together with the starter case to the engine body at multiple locations around the insertion port, the air guide case is less likely to vibrate even when subjected to engine vibrations, and noise can be reduced.

Moreover, since the starter case and the air guide case are fixed together in a collinear manner, the structure can be simplified and the manufacturing cost can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
4 is a sectional view taken along the line IV--IV of FIG. 1, and FIG. 5 is a view corresponding to FIG. 3 of a modification. 1...Engine, 2...Crankcase, 3...
Starting shaft, 5...Cooling fan, 6...Cylinder, I.
... Air guide case, 9... Insertion port, 10... Recoil starter, 11... Starter pulley, 12... Starter case, 15... Support tool.

Claims (1)

[Scope of utility model registration request] A starting shaft 3 is protruded from one side of a crankcase 2 of a forced air-cooled engine 1, a cooling fan 5 is fixed to the starting shaft 3, and an air guide case is used to guide the air from the cooling fan 5 to a cylinder 6. 7 is positioned on one side of the engine 1 in a state covering the cooling fan 5, and an insertion hole 9 is opened in the air guide case 7 on one side of the cooling fan 5, and this insertion hole 9 is connected to the starting shaft. Recoil starter 1 connected to the tip of 3
It is shaped into a size that allows the starter pulley 11 of 0 to be inserted through it,
The end of the starter pulley 11 that protrudes outward from the insertion port 9 on one side is covered with a starter case 12, and the starter case 12 and the air guide case 7 are connected to the engine body at multiple locations around the insertion port 9. Supports 15 erected...
・A forced air-cooled engine with a coil starter, which is fixed to the outer end of the starter in a co-tight manner.