JPS5950847B2 - engine niokeruboujinsouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust prevention device for an engine, which prevents straw and various dust from adhering to and interfering with the engine mounted on a harvester such as a combine, and in particular prevents intervening dust. This was done in order to maintain normal engine cooling performance over a long period of time by preventing the centrifugal particles from strongly accumulating in the inner periphery of the intake side end of the starting pulley. The unique feature is that a side-flow type draft fan is installed on the fan mounting shaft that protrudes from one side of the crankcase, and a draft cover that conducts the generated air from around the fan to the cylinder is attached to the outer circumferential area of the fan. The fan-side outer end surface of the baffle cover is located outward from the outer end surface of the fan, and the fan has a stepped section at the center of the outer end surface consisting of a small diameter part and a large diameter part. A cylindrical starting pulley is installed concentrically with the fan, the large diameter part of the pulley is located at the outer end in the axial direction, the outer end surface is open, and a rope is wound around the outer peripheral surface of the large diameter part. A groove is formed, an intake communication port is provided on the circumferential surface of the small diameter part, and a truncated conical dust removal guide is provided between the outer end corner of the small diameter part and the outer end opening edge of the large diameter part. In addition, a dustproof net is attached to the opening of the large diameter portion in a lid-like manner so as to be rotatable together with the pulley, and between the outer peripheral edge of the dustproof net and the opening edge of the large diameter portion. A dust removal port that communicates between the inside and outside is provided along the slope of the dust removal guide, and on the other hand, an intake connecting cylinder that covers the outer circumferential area of the small diameter part is provided on the shoulder of the large diameter part, and the inner end surface of the connecting cylinder is connected to the guide. An intake port that faces the outer end surface of the wind cover with a predetermined gap therebetween and communicates between the inside and outside is provided on the circumferential surface of the connecting tube, and the outer circumferential surface of the inner end of the intake connecting tube is provided with a radial distance from the gap. It is equipped with a dust removal fan that can blow air outward.

Hereinafter, the present invention will be explained according to illustrated examples and in conjunction with the prior art.

Figure 1 shows the outline of the engine. 1 is a crankcase with a power take-off shaft 2 on the left side and a second shaft on the other side.
As shown in the cross section in the figure, a fan mounting shaft 3 such as a crankshaft is taken out.

4 is a finned cylinder installed on the crankcase 1, including the cylinder head, 5 and 6 are the intake ports and exhaust ports, and 7 is the cowling around the cylinder 4, as is well known. .

Regarding the cooling system, reference numeral 8 denotes an air blowing fan attached to the fan mounting shaft 3 as shown in the second figure, and an air guide cover 10 is provided around the outer periphery of the fan 8 to conduct the generated air to the cylinder 4 as shown in the first figure.
At the center of the outside of the fan 8, a starting pulley 9 having an air intake communication port 9a penetrating the outer periphery and having an open protruding end is attached to the center of the outside of the fan 8. The intake air passage port 10a, which is opened at the center of the end, is configured to have a bulge shape so as to leave a gap between the layers.

An enlarged stepped portion 9b, which is not particularly limited, is formed on the outer periphery of the protruding end of the starting pulley 9, and a tenth ring 11 is protruded in the shape of a flange on the outer periphery of the end. At the inner side of the stepped portion 9b, there is a hat-shaped intake connecting pipe 1 to form a rope winding groove 12 as an outer circumferential groove together with the outer circumferential wall of the stepped portion 9b.
3 are both rotatably fixed.

The cylinder 13 has an open end so as to correspond internally to the air intake passage port 10a of the air guiding cover 10, and the proximal thrust portion of the cylinder 13 has a number of first air intake ports 14 as shown in the third figure. A second air intake port 16 is formed in the body of the cylinder 13, and a second air intake port 16 is provided with a sub-dust-proof net 15 made of expanded metal or the like on the inner circumferential side. It is penetrated as a position etc.

In addition, a dust removal fan 1 is installed in the circumferential position of the cylinder 13 corresponding to the protruding end of the air guide cover 10 as shown in FIG.
7 is disposed so that the wind can be raised freely in the outer radial direction while leaving an appropriate thrust interval.

Note that 18 in the first diagram is a well-known starting rope, and 19 is the same rope 1.
This is the hook part of No.8.

In the specific example, which is not particularly limited, as shown in FIG. 80 to 80 through an intake range corresponding to the second illustrated arrow X, that is, the cross section of the starting pulley 9.
It has been experimentally confirmed that 90% of the intake air is introduced, and the remaining intake air amount is divided between the first and second intake ports 14 and 16.

Therefore, under such a suction ratio, not only the above-mentioned specific example but also the straw dust etc. sucked in by the rotation of the starting pulley 9 will be attracted to the inner peripheral area of the tip of the pulley 9 due to the centrifugal force. 2
As shown in the hypothetical diagram, the conventional pulley 9 has an open tip, so a large amount of dust accumulates regardless of its size or whether it is wet or not, and it can even form a condensation state. As a result, the engine is inevitably heated due to the blockage of the intake port.

In particular, as shown in the second figure, the rope winding groove 12 is connected to the starting pulley 9.
In the case of the type configured with the stepped portion 9b, there is a strong tendency for dust to accumulate and accumulate because the intake air circulation is passive in this portion.

As shown in FIGS. 2 and 3 as a first specific example, the present invention includes a dustproof net 20 attached in a transverse shape to the tip opening of the starting pulley 9, and the starting pulley 9 and the starting pulley 9
Some dust removal ports 21 are opened around the entire circumference between the inside and outside of the
In addition, an expanded dust removal guide 22 is attached to the tip blade as a separate ring body along the inner peripheral side corresponding to the stepped portion 9b, and the guide 22 has an expanded end on the dust removal port 21 side. To be oriented.

Note that 23 is a main intake port, and 24 is a fixing device for fixing the dustproof net 20 to the starting pulley 9.

Therefore, when the starting pulley 9 rotates as in the above example, most of the air intake by the draft fan 8 is introduced from the dustproof net 20 which is the main intake port 23, but since the net 20 also rotates, straw waste is removed. etc. are subjected to the so-called first stage intervention cut.

This intervention is extremely difficult due to the rotation, and there is no chance of intervention for relatively large pieces of straw. may also be exhibited.

The fine dust that has intervened in this way is immediately led out to the dust removal port 21 by the centrifugal force in the inner area, as shown by arrow Y in FIG.
Here, in combination with the dust removal guide 22, the dust is removed smoothly through a similar route.

In particular, if the space is made narrower as it approaches the dust removal port 21 as in the second illustrated example, the discharge speed will be increased.

In addition, as shown in the second illustrated example, the dust removal fan 17 is connected to the air guide cover 1.
If it is attached between the protruding side of the 0 and the 0, it will act as a third stage dust remover.

As described above, the present invention attaches the dustproof net 20 to the open end of the starting boob 119 so that both can freely rotate.
Most of the straw waste is cut off, and once the dust has intervened, it is centrifugally released from the dust removal port 21 attached to the circumference near the dustproof net 20, so the amount of intake air is reduced as described above. A large amount of dust from the opening at the tip of the starting pulley 9, which accounts for most of the engine noise, does not accumulate on the inner periphery of the starting pulley 9, and the intake area can be maintained at the required level, improving engine cooling performance to an initial level. can be maintained in the same condition.

Furthermore, in the present invention, since a truncated conical dust removal guide is provided on the inner surface of the large diameter part of the starting pulley, the guide serves as a reinforcing material for the large diameter part and also prevents the large diameter from stagnation due to cooling air. Effectively prevents dust from adhering to the inner surface of the part.

In addition, this dustproof guide uses centrifugal force due to its rotation.
Since the dust-containing air near the guide is led out from the dust removal port, dust is not sucked into the fan.

Further, in the event that the dust is sucked in by the fan, it is sucked outside by the dust removal fan provided in the intake connecting cylinder, so that dust-containing air is no longer sent to the engine.

[Brief explanation of the drawing]

FIG. 1 is an external view showing a specific example of the present invention as an entire engine, FIG. 2 is an enlarged cross-sectional view showing the cooling system shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line v--v in FIG. 1...Crankcase, 4...Cylinder, 8...Breath fan, 9...Start pulley, 9a...Intake communication Mouth, 10...
・Wind guide cover, 20...Dustproof mesh, 21・
...Dust removal port.

Claims (1)

[Claims] 1. A fan mounting shaft 3 protruding from one side of the crankcase 1.
A side-flow type draft fan 8 is provided in the fan 8 , and a draft cover 10 is provided to cover the outer peripheral area of the fan 8 to conduct the generated wind from the periphery of the fan 8 to the cylinder 4 . The fan-side outer end surface of the fan 8 is located outward from the outer end surface of the fan 8, and the fan 8 has a small diameter portion and a large diameter portion 9b at the center of the outer end surface.
A stepped cylindrical starting pulley 9 is installed concentrically with the fan 8, and the large diameter portion 9b of the pulley 9 is located at the outer end in the axial direction, and its outer end surface is open. A rope winding groove 12 is formed on the outer circumferential surface of the large diameter portion 9b, and an intake communication port 9a is formed on the circumferential surface of the small diameter portion. A truncated conical dust removal guide 22 between the end opening edges
is provided, and a dustproof net 20 is attached to the opening of the large diameter portion 9b in a lid-like manner so as to be able to rotate integrally with the pulley 9, and the outer peripheral edge of the dustproof net 20 and the large diameter portion 9b are A dust removal port 21 that communicates between the inside and outside is provided along the slope of the dust removal guide 22 between the opening edges, and an intake connecting cylinder 13 that covers the outer peripheral area of the small diameter portion is provided at the shoulder of the large diameter portion 9b. , the inner end surface of the connecting tube 13 faces the outer end surface of the air guide cover 10 with a predetermined gap therebetween, and an intake port 16 is provided on the circumferential surface of the connecting tube 13 to communicate between the inside and outside, and the intake connection A dust prevention device for an engine, characterized in that a dust removal fan 17 is provided on the outer circumferential surface of the inner end of the cylinder 13 and is capable of blowing air radially outward from the gap.