JPH0244018Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention was developed in order to prevent elongated dust such as wheat wild hair from being sucked into the fan case and clogging the fan case in a forced air-cooled engine with a recoil starter. The present invention relates to a device for shredding elongated dust, and provides a technology that can sufficiently shred the dust while reducing the air intake resistance of the fan.

<Prior art> When a forced air-cooled engine is operated in an atmosphere of elongated dust, the elongated dust is sucked into the fan case by the cooling air of the engine cooling fan, accumulates, and becomes clogged, blocking the flow of cooling air. This can cause the engine to overheat.

The elongated dust includes, for example, the wild hair that falls off from the ears of wheat during wheat reaping and threshing operations, and this wild hair generally has a diameter of 1 mm or more and a length of 1 mm or more.
There are also 100-150mm.

As a means to prevent elongated dust from accumulating inside the fan case, the dust is shredded into pieces of a predetermined length or less using a shredding tool, and then blown into the fan case and between the fins of the cylinder to be discharged outside the engine. There is technology.

Conventionally, as a device to shred elongated dust,
There is a technique described in Japanese Utility Model Publication No. 60-18581 (see Figure 5).

In this conventional technology, a large number of slit-shaped suction ports 30 are radially formed in the fan case 7 of the fan 6.
The rotating disk 31 is located on the front side of the fan case 7 and fixed to the starting cup 32.
A large number of ventilation holes 33 and dust shredding tools 34 are formed alternately in a radial manner.

Then, when the engine is running, the starting cup 32
The rotating disk 31 is driven to rotate through the cooling air, and the elongated dust is inserted into the ventilation hole 33 and the intake port 30 through the cooling air, and the rotating dust shredding tool 34 cuts it to a predetermined length or less. It is shredded to the size of .

<Problems to be solved by the invention> In the above-mentioned conventional technology, a large number of slit-shaped suction ports 30 must be formed radially in order to cut the elongated dust into pieces of a predetermined length or less, and the dust Since a large number of dust shredding tools 34 are required, and the large number of dust shredding tools 34 intermittently close the radial intake ports 30 one after another while rotating, the air intake resistance of the fan 6 becomes large, and the engine There is a problem that the cooling performance of

The purpose of this invention is to reduce the air intake resistance of the fan and improve the cooling performance of the engine while cutting long and thin dust into sufficiently short pieces.

<Means for Solving the Problems> In order to achieve the above object, the present invention is constructed as follows, as shown in FIGS. 1 to 3, for example.

That is, the recoil case 13 is fixed to the peripheral wall portion 11 of the intake port 10 of the fan case 7 of the cooling centrifugal fan 6 of the forced air-cooled engine E with a recoil starter, the recoil starter 14 is fixed to the front part of the recoil case 13, and the recoil starter 14 is fixed to the peripheral wall portion 13a is provided with a dust-proof air intake port 15, and a starter cup 16 fixed to the front center of the fan 6 is inserted into the recoil case 13 and faces the recoil starter 14, so that the cooling air from the fan 6 is attached to the fan case. In the dust shredding device for a forced air-cooled engine with a recoil starter configured to shred elongated dust D that is about to be sucked into the dust shredding tool 20, the dust shredding tool 20
The second cut part 22 is attached to the first cut part 21 and the bent part 23
The folded part 23 of the dust shredding tool 20 is brought close to the peripheral wall part 13a of the recoil case 13 and the peripheral wall part 11 of the intake port 10 of the fan case 7 within the recoil case 13. , 1st
After running the shredded part 21 forward from the bent part 23, it is fixed to the starting cup 16, and the second shredded part 22 is run in the centripetal direction from the bent part 23, and then fixed to the starting cup 16.
It is characterized by being fixed at .

<Effect> The present invention works as follows.

When the engine is running, the dust shredding tool 20 is rotationally driven by the power of the engine via the fan 6 and the starting cup 16. The elongated dust D is sucked into the fan case 7 from the atmosphere by the cooling air of the fan 6 through the dust-proof air intake port 15, recoil case 13, and suction port 10.

The elongated dust D first enters the recoil case 13 and is then cut into the first shredding part 21 of the dust shredding tool 20.
It is cut into pieces longer than a predetermined short length, and then, when it leaves the recoil case 13, it is cut into pieces shorter than a predetermined short length at a second cutting part 22.

In the present invention, since the dust is shredded twice in this way, the required number of dust shredders 20 can be halved compared to the conventional technology that shreds the dust only once.

<Example> Hereinafter, an example of this invention will be described with reference to the drawings. FIG. 1 shows a longitudinal side view of the front part of a forced air-cooled side valve engine E, and in the figure, an arrow Fr indicates the front side of the engine E. Figures 2 and 3 are
2A and 2B are cross-sectional views taken along the - line and - line arrows in FIG. 1, respectively.

1 is a crankcase, 2 is a cylinder block, and this cylinder block 2 is integrally formed with a cylinder 3 and an intake/exhaust block 4 arranged side by side. A cooling centrifugal fan 6 interlocked with the crankshaft 5 is disposed on the front surface of the crankcase 1.

The fan 6 is housed in a fan case 7 attached to the crankcase 1. In the figure, an arrow R indicates the rotation direction of the fan 6.

A partition plate 8 is suspended from the upper inner peripheral surface 7a of the fan case 7 on the front side of the cylinder block 2. The cooling air discharged from the fan 6 is distributed between the cylinder 3 and the intake/exhaust block 4 by the partition plate 8 .

Further, a cylindrical recoil case 13 is fixed to a peripheral wall portion 11 of the intake port 10 of the fan case 7 . A recoil starter 14 is housed in the front part of the recoil case 13. Further, a mesh-like dustproof air intake port 15 is formed in the peripheral wall portion 13a of the recoil case 13. On the other hand, a starting cup 16 is fixed to the center of the front surface of the fan 6. This starting cup 16 is inserted into the recoil case 13 and faces the recoil starter 14.
4 can be interlocked with the crankshaft 5 via a starting cup 16. Then, by pulling a recoil handle (not shown) connected to the recoil starter 14, the engine E is started, and the outside air taken in from the dust-proof air intake port 15 is guided to the fan case 7 by the fan 6, and is blown onto the cylinder block 2. ing. In the figure, arrow A indicates the flow of cooling air.

In the above configuration, a plurality of dust shredding tools 20 are provided in the recoil case 13 to shred long and narrow dust D that is about to be blown into the fan case 7 by the cooling air of the fan 6. These dust shredding tools 2
0 are arranged on the peripheral wall 16a of the starting cup 16 at approximately equal intervals in the circumferential direction.

Each of the dust shredding tools 20 described above has two shredding parts formed by bending a strip. The first cut portion 21 extends in the front-rear direction, and as it extends forward, the first cut portion 21 extends on the peripheral wall 13a of the recoil case 13.
It is formed so that it gradually moves away from the From the rear end of this first cut portion 21 to the peripheral wall 1 of the starting cup 16
The second cut portion 22 is bent toward 6a. 23 is the bent portion.

The bent portion 23 is arranged so as to approach the peripheral wall portion 13a of the recoil case 13 and the peripheral wall portion 11 of the intake port 10 of the fan case 7 with a small gap (3 to 4 mm) between them. The front end of the first shredded part 21 is extended and fixed to the front part of the starting cup 16, and the inner end of the second shredded part 22 in the centripetal direction is fixed to the rear part of the started cup 16.

FIG. 4 shows another embodiment. in this case,
The first cut portion 21 is a peripheral wall 1 of the recoil case 13.
It extends in the front-rear direction from 3a with a certain gap therebetween.

<Effects of the invention> Since the present invention is configured and operates as described above, it has the following effects.

As explained in the <Function> section above, the required number of dust shredding tools can be halved, the dust-proof air intake port on the peripheral wall of the recoil case does not need to be slit-shaped, and can be left wide open, and the number of dust-shredding tools can be reduced by half. Since the small dust shredding tool does not intermittently close the dust-proof air intake port which opens widely as it rotates, the air intake resistance of the fan is reduced.

This reduces the air intake resistance of the fan and improves the cooling performance of the engine, while cutting long and thin dust particles to smaller pieces than a predetermined length and preventing them from accumulating and clogging inside the fan case. can.

[Brief explanation of the drawing]

1 to 4 show examples of this invention,
Fig. 1 is a vertical side view of the front part of the engine, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. FIG. 1 is a view corresponding to an example, and FIG. 5 is a perspective view showing a conventional example. D...Elongated dust, E...Engine, 6...
Fan, 7...Fan case, 10...Inlet,
11... Peripheral wall portion, 13... Recoil case, 1
3a... Peripheral wall portion, 14... Recoil starter, 1
5...Dust-proof air intake, 16...Starting cup, 20...
...Dust shredding tool, 21...First shredding part, 22...Second shredding part, 23...Bending part.

Claims (1)

[Scope of utility model registration request] Inlet port 1 of fan case 7 of centrifugal fan 6 for cooling of forced air-cooled engine E with recoil starter
A recoil case 13 is fixed to the peripheral wall portion 11 of the fan 6, a recoil starter 14 is provided to the front of the recoil case 13, a dust-proof air intake port 15 is provided to the peripheral wall portion 13a, and a starting cup 16 fixed to the front central portion of the fan 6 is connected to the recoil starter 14. It is constructed so as to be inserted into the case 13 and facing the recoil starter 14, and is configured to shred elongated dust D that is about to be sucked into the fan case 7 by the cooling air of the fan 6 with the dust shredding tool 20. In the dust shredding device for a forced air-cooled engine with a recoil starter, the dust shredding tool 20 is configured by connecting a first shredding part 21 and a second shredding part 22 through a bending part 23 in a bent manner, The bent part 23 of the dust shredding tool 20 is connected to the peripheral wall part 13a of the recoil case 13 and the fan case 7.
The first shredded part 21 is run forward from the bent part 23 and then fixed to the starting cup 16, and the second shredded part 22 is moved from the bent part 23 in the centripetal direction. A dust shredding device for a forced air-cooled engine with a recoil starter, which is run and fixed to a starting cup 16.