JPH06317150A - Muffler cooling device of reverse forced air cooling device of engine - Google Patents

Abstract

PURPOSE:To properly cool a muffler using the cooling exhaust of a reverse type forced air cooling device even if the fixed position of the muffler is varied. CONSTITUTION:A fan case 1 is disposed in front of an engine E and exhaust direction adjusting plates 8 are pivotally supported to both the right and left side portions 6,7 of the exhaust port 4 of the fan case 1 in such a manner as capable of oscillating horizontally, and the direction of adjustment of each exhaust direction adjusting plate 8 can be fixed by direction fixing means 10. Even if a muffler 5 is held in position deviating from the exhaust port 4 owing to the condition under which the engine E is mounted on a working vehicle, the direction, range and speed of cooling exhaust can be properly determined by adjustment of the oscillation of the exhaust direction adjusting plates 8,8, so the muffler 5 can always be cooled sufficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler cooling device for a reverse type forced air cooling system of an engine, in which the direction and flow velocity of cooling exhaust air are properly selected according to the fixed position of the muffler with respect to the engine body. The thing which can be cooled well is provided.

[0002]

2. Description of the Related Art In an enclosure type engine working machine or the like, a muffler is cooled by a reverse type forced air cooling device which is a method of air cooling an engine with suction cooling air,
There are many cases in which the exhaust heat is smoothly discharged to the outside without stagnation in the soundproof case.

The present invention is directed to a muffler cooling device of this engine reverse type forced air cooling device, the basic structure of which is:
As shown in FIG. 2 or FIG. 10, the fan case 1 is arranged in front of the engine E, the centrifugal fan 3 fixed to the rotating shaft 2 of the engine E is housed in the fan case 1, and the fan case 1 has a suction port 11 In addition, the exhaust port 4 is opened, the intake port 11 is exposed to the engine E, the muffler 5 is exposed to the exhaust port 4, and the cooling air is passed by the rotation of the centrifugal fan 3 from behind the engine E to suck the cooling air. It is of a type configured such that it is sucked into the fan case 1 from the air outlet 11 and blown out from the air outlet 4 to the muffler 5.

As a conventional technique of this type, as shown in FIGS. 9 and 10, an air exhaust port 4 is opened above the fan case 1 of the vertical air-cooled engine E, and a muffler 5 is fixed above the air exhaust port 4. There is one arranged.

[0005]

In the above prior art, when the engine E is mounted on a working machine, the muffler 5 or the exhaust pipe 16 easily protrudes from the engine body, so that these should be prevented from interfering with peripheral equipment. It needs to be positioned and fixed. As a result, as shown by the phantom line in FIG. 9, the fixed position of the muffler 5 may be slightly displaced laterally from the air outlet 4 of the fan case 1. In this case, the muffler 5 may not be effectively cooled by the cooling exhaust air. Further, since the exhaust heat increases during the high load operation of the engine E, the exhaust port 4
There is a possibility that the muffler 5 cannot be sufficiently cooled by the cooling exhaust air from the.

Therefore, the applicant of the present invention, as shown in FIG.
By extending the flexible pipe 50 from the air exhaust port 4, even if the muffler 5 is fixed outside the air exhaust port 4, the air outlet 51 of the flexible pipe 50 can be brought into contact with the muffler 5. Was proposed first. In this prior art, unlike the above-mentioned prior art, instead of separately fixing the centrifugal fan 3 and the flywheel 12 to the crankshaft 2 in the front-rear series, only one centrifugal fan 3 also serving as a flywheel is fixed. I am doing it.

However, in the prior art, it is necessary to improve the shape of the fan case 1 so that the flexible pipe 50 can be extended, and a holder for fixing the position of the flexible pipe 50 toward the muffler 5. Is actually necessary, so the structure becomes complicated. The present invention does not have a complicated structure, and even if the fixed position of the muffler changes,
The technical issue is to properly cool the muffler by the cooling exhaust air of the reverse type forced air cooling device.

[0008]

Means for achieving the above object will be described below with reference to FIGS. 1 to 5 showing an embodiment. That is, according to the present invention, in the muffler cooling device of the reverse type forced air cooling device for the engine of the basic structure, the pair of exhaust direction control plates 8 are provided on both side parts 6 and 7 of the fan case 1 facing the exhaust port 4. 8 are pivotally supported so as to be capable of swinging adjustments in the distance direction, and the exhaust direction control plates 8 and 8 are configured to be fixed by the direction fixing means 10 in the postures after the swing adjustments. It is what

[0009]

[Operation] Each of the exhaust direction control plates 8 on both sides 6 and 7 of the exhaust port 4
8 is pivotally supported so that when the engine E is mounted on a working machine or the like, the wind direction adjusting plates 8 and 8 are swingably adjusted in accordance with the fixed position of the muffler 5 to fix the direction. When the direction is fixed by the means 10, the cooling exhaust air can be blown out from the air exhaust port 4 toward the muffler 5 via the fan case 1. When the engine E is operated under high load,
When the exhaust direction control plates 8 and 8 on both the left and right sides 6 and 7 are swingably fixed to each other so as to narrow the passage cross-sectional area of the exhaust port 4, the flow speed of cooling exhaust air is increased and the muffler 5 is cooled strongly. it can.

[0010]

【The invention's effect】

(1) Even if the muffler and the exhaust pipe are slightly displaced to the side from the exhaust port of the fan case due to the condition of mounting the engine on the work machine, the cooling exhaust air blown out from the exhaust port is adjusted by the swing adjustment of the exhaust direction adjustment plate. Since the wind direction, range, flow velocity, etc. can be properly selected, the muffler and the exhaust pipe can always be cooled well. In other words, it is possible to mount the engine on the work machine with a large degree of freedom without being restricted by the fixed position of the muffler while maintaining high cooling performance of the muffler by the cooling exhaust air. In the present invention, the structure of the device can be simplified as compared with the above-mentioned prior art because only the exhaust direction adjusting plate is provided in the fan case.

(2) Since the direction, range and flow rate of the cooling exhaust air can be properly selected by adjusting the swing of the exhaust air direction adjusting plate, the fan case can be shared between engines having different muffler fixing positions. The mass productivity of the muffler cooling device can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view showing a muffler cooling device of a reverse engine forced air cooling device for a vertical engine, FIG. 2 is a vertical cross-sectional left side view showing the muffler cooling device, and FIG. 3 is a front view of a main part of an exhaust direction control plate. 4 is a sectional view taken along line III-III of FIG. 3, and FIG. 5 is IV of FIG.
-A sectional view taken along line IV.

As shown in FIG. 2, the front of the vertical engine E is covered with an air intake case 13, the fan case 1 is fixed in front of the air intake case 13, and the front end of the crank shaft 2 of the engine E is fried. Attach foil 12 and fly foil 1
The centrifugal fan 3 is fixed to the shaft 2 via a transmission pulley 14, the flywheel 12 is housed in the air suction case 13, and the centrifugal fan 3 is housed in the fan case 1. 1 and 2
As shown in FIG. 3, the fan case 1 is formed in a flat and substantially circular box shape, and is sucked toward the inner diameter of the blower blades 15 of the centrifugal fan 3 in the rear portion of the fan case 1 which is in contact with the air suction case 13. Open the wind vent 11 and the upper part 1 of the fan case 1.
a is extended in the shape of a rectangular tube, and the air exhaust port 4 is opened to the left and right in the fan case upper portion 1a.

As shown in FIGS. 1 and 2, the exhaust pipe 16 extends forward from the rear portion of the vertical engine E, and the muffler 5 is fixed to the left and right at the upward front end portion 16a of the muffler 5 and the exhaust pipe. The front end portion 16a is made to face the air exhaust port 4 of the fan case 1 from above, and the cooling air is sucked into the fan case 1 from the rear of the engine E through the air intake port 11 by the rotation of the centrifugal fan 3 and is discharged from the air exhaust port 4. The muffler 5 is configured to blow cooling exhaust air.

As shown in FIG. 1, each exhaust direction adjusting plate 8 is pivotally supported on the left and right side portions 6 and 7 in the fan case 1 facing the exhaust port 4 so as to be swingable in the left and right directions to exhaust air. Each of the direction fixing plates 8 faces the direction adjusting plate 8, and each of the exhaust direction adjusting plates 8
The adjustment direction can be fixed.

That is, as shown in FIGS. 3 to 5, the vane-shaped exhaust direction adjusting plate 8 is pivotally supported on the rear wall 17 of the fan case 1 about the support shaft 18, and is supported on the rear wall 17. An elongated hole 19 is opened in the concentric direction of the shaft 18, and a closing support plate 21 integrated with the airflow direction adjusting plate 8 is brought into contact with the elongated hole 19 from the rear. Further, the direction fixing means 10 is composed of a receiving screw 22 and a fixing nut 23.
1 to project forward through the elongated hole 19, and a fixing nut 23 is screwed into the receiving screw 22 from the front.

In this case, each exhaust direction control plate 8 has a support shaft 18
When the fixing nut 23 is fastened to the receiving screw 22 by swinging in the left-right direction along the long hole 19 around the center, the wind direction adjusting plate 8 can be positioned and fixed in any direction. Incidentally, the side of the elongated hole 19 facing the cooling air exhaust passage 20 is closed by the rear closing support plate 21 as shown in FIG. 3, so that the cooling exhaust air leaks from the elongated hole 19 to the outside. It never comes out.

Therefore, the function of the muffler cooling device of this embodiment will be described. When installing the engine E on a work machine, etc.,
When each exhaust direction adjusting plate 8 is swingably adjusted in the left-right direction according to the fixed position of the muffler 5 and the direction is fixed by the direction fixing means 10, the cooling exhaust air is exhausted from the exhaust port 4 via the fan case 1 to the muffler. It is possible to properly blow out toward 5. For example, each of the exhaust direction adjustments 8 is performed by setting the muffler 5 at the solid line position in FIG.
If is fixed, it is oriented to the position shown by the solid line in Fig. 1,
When the muffler 5 is fixed to the position of the virtual line in order to avoid a collision with the peripheral equipment of the work machine, it is also oriented to the position of the virtual line in FIG. Further, when the left and right air exhaust direction adjusting plates 8 and 8 are oriented so that the tips thereof approach (that is, the cooling air exhaust passage 20 is narrowed), the passage cross-sectional area of the exhaust outlet 4 becomes small. Therefore, it is possible to cope with the case where the flow velocity of the cooling exhaust air increases and the exhaust heat during the high load operation of the engine E increases.

As a result, even if the muffler 5 is disengaged from the exhaust port 4 of the fan case 1 due to the mounting condition of the engine E on the working machine, the swing direction of the exhaust direction adjusting plate 8 is adjusted to cool the exhaust direction. , The range, flow velocity, etc. can be properly selected, and the muffler 5 can always be cooled well. In this embodiment, since the front end portion 16a of the exhaust pipe 16 faces the exhaust port 4, the cooling exhaust air blown from the exhaust port 4 also cools the exhaust pipe front end portion 16a outside the muffler 5. Therefore, the exhaust system can be efficiently cooled.

However, when the muffler 5 is arranged on the upper / lower side or the left / right side of the engine E with the mounting of the engine E on the working machine, as shown in FIGS. May be intermittently fixed to the air intake case 13 by 90 degrees.

That is, a receiving screw 24 is projected forward from the air intake case 13, a plurality of screw insertion holes 25 are opened in the rear wall 17 of the fan case 1 in the circumferential direction, and each receiving screw 24 is inserted into the screw insertion hole. 25, respectively, and fixed nuts 2
The fan case 1 is fastened to the air intake case 13 by means of 6 at an appropriate angular position. Reference numeral 27 is a steady rest supporting arm of the fan case 1. 28 is a bolt, 29 is a nut, and 30 is a bolt insertion hole. In this case, muffler 5
Is arranged on the upper side of the engine E, the fan case 1 is positioned and fixed at the position shown in FIG. 6A. Hereinafter, when the muffler 5 is arranged on the right side, the lower side, and the left side, respectively,
Are arranged at the positions shown in FIGS. 6B, 6C, and 6D, respectively.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a muffler cooling device of a reverse type forced air cooling device of a vertical engine.

FIG. 2 is a left side view in vertical section showing the muffler cooling device.

FIG. 3 is a front view of a main portion of an exhaust direction control plate.

4 is a sectional view taken along line III-III in FIG.

5 is a sectional view taken along line IV-IV in FIG.

FIG. 6 is a schematic front view showing a fan case that can be rotationally fixed.

FIG. 7 is a view corresponding to FIG. 2, showing an example of assembling the rotation-fixable fan case.

FIG. 8 is a view equivalent to FIG. 2 showing the prior art.

FIG. 9 is a view equivalent to FIG. 1 showing a conventional technique.

FIG. 10 is a view corresponding to FIG. 2 showing the same conventional technique.

[Explanation of symbols]

1 ... Fan case, 2 ... Rotating shaft, 3 ... Centrifugal fan, 4 ...
1 air exhaust port, 5 ... muffler, 6 ... 4 left side part, 7 ... 4 right side part, 8 ... exhaust direction control plate, 10 ... direction fixing means, 11
… 1 air intake, E… engine.

Claims (1)

[Claims] 1. A fan case (1) in front of the engine (E).
The centrifugal fan (3) fixed to the rotating shaft (2) of the engine (E) is housed in the fan case (1), and the fan case (1) has an air intake port (11) and an air exhaust port (4). The air intake (11) facing the engine (E), and the air exhaust (4)
Face the muffler (5) to the cooling fan by rotating the centrifugal fan (3) from behind the engine (E) through the engine (E), and suck it into the fan case (1) from the air intake (11). , Muffler from the air outlet (4)
In a muffler cooling device for a reverse forced forced air cooling device of an engine configured to blow out to (5), both side parts (6) in the fan case (1) facing the air outlet (4)
-A pair of exhaust direction adjusting plates (8) and (8) are pivotally supported in (7) so that they can be respectively swung in the perspective direction, and the exhaust direction adjusting plates (8) and (8) are provided. Is a muffler cooling device for a reverse type forced air cooling device of an engine, wherein the muffler cooling device is configured such that it can be fixed by each direction fixing means (10), (10) in a posture after adjusting the swing.