JPH04103837A - Fan case for engine cooling centrifugal fan - Google Patents

Abstract

PURPOSE:To make noise low and make manufacture simple as well as to enhance durability by making up a fan case main body while reinforcing members formed into the shape of the main body are being integrated into one, forming a sheet type metallic reinforcing member for which a great number of small holes are closely provided, and thereby constituting an inlet port section to act as a dust proof inlet fixture. CONSTITUTION:A fan case main body 6 is made up by integrating an thickened end sections 10 of synthetic resin with a series of sheet type metallic reinforcing members 9 formed into the shape of the main body, and a sheet type metallic reinforcing member 9 is made up out of a mesh member for the entire surface of which a great number of small holes 11 are closely provided. The fan case main body 6 is formed in such a way that the sheet type metallic reinforcing member 9 is housed in the mold of an injection molding machine while synthetic resin such as polypropylene and the like is pressed into the mold with pressure. In this case, a part of the sheet type metallic member 9 is exposed in a state that it comes across an inlet port 7, the inlet port section 12 of the sheet type metallic reinforcing member 9 is thereby utilized as a dust proof inlet fixture 8 as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fan case for a centrifugal fan for engine cooling.

[Basic Structure] The basic structure of the fan case of the centrifugal fan for engine cooling, which is the premise of the present invention, is as follows.

For example, as shown in FIG. 1 or 2, a case end wall 3 facing the fan outer end surface 2 of the engine cooling centrifugal fan 1 and a case peripheral wall 5 facing the fan outer peripheral surface 4 are integrally formed. A case end wall 3 constitutes a fan case body 6.
An air suction port 7 is opened at the top, and a dust-proof air suction device 8 is provided in the air suction port 7.

With this basic structure, the centrifugal fan 1 is protected by the fan case main body 6, and the dust-proof air suction device 8 can remove dust from the outside air sucked in from the air intake port 7 by the suction force of the centrifugal fan 1.

[Prior Art] The above basic structure has also been conventionally employed in the technology shown in FIG. 4.

However, in this prior art, in order to ensure robustness, the fan case main body 50 is formed of a drawn metal plate, and the dust-proof wind suction device 51 is constructed of a disk-shaped punched metal. It is configured by being attached to the air intake port 52 with a fixing bolt 53.

[Problem to be solved by the invention] The above conventional technology has the following problems.

■The metal fan case main body 50 resonates with engine vibration and emits large vibration noise, so it is noisy.

(2) During manufacturing, in addition to the process of molding the fan case main body 50 by a complicated drawing process, a process of attaching the dust-proof air suction device 51 is required, which increases the manufacturing cost.

Therefore, in order to solve the above-mentioned problems (1) and (2), prior to the present invention, the inventor of the present invention considered forming the fan case body 50 of the prior art described above from synthetic resin.

In this case, the fan case body 50 does not resonate with engine vibrations, there is no room for large vibration noise to be generated from the fan case body 50, and the molding can be done by simple injection molding. Problem ■ arises.

■The fan case main body 50 made of synthetic resin has lower robustness and therefore lower durability than one made of metal.

The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to maintain high durability while reducing noise and simplifying manufacturing.

[Means for Solving the Problems] As shown in FIG. 1 or 2, for example, in the basic structure, the fan case main body 6 has a series of planar metal parts that maintain the shape of the main body. The reinforcing material 9 is constructed by integrating a synthetic resin flesh part 10, and the planar metal reinforcing material 9 has a large number of small holes 11 arranged closely over its entire surface. Of these, the air intake port portion 12 is configured as the dust-proof air suction tool 8.

As the planar metal reinforcing material 9, net material, punched metal, expanded metal, etc. can be suitably used.

As the synthetic resin forming the flesh portion 10, a thermoplastic resin such as polypropylene or a thermosetting resin may be used.

The planar metal reinforcing material 9 may be completely buried in the flesh portion 10, or may be buried in the flesh portion 10 with its surface portion exposed from the inner or outer surface of the flesh portion 10. .

[Function] According to the present invention, the fan case body 6 having the synthetic resin flesh portion 10 does not resonate with the vibrations of the engine 13, and there is no room for large vibration noise to be emitted from the fan case body 6. becomes smaller.

At this time, since the planar metal reinforcing material 9 that constitutes a part of the fan case body 6 is integrated with the synthetic resin flesh part 10, it does not resonate independently with the vibrations of the engine 13. There is no room for vibration noise to be emitted from the planar metal reinforcing material 9.

In addition, when the fan case body 6 is formed by simple injection molding, compression molding, etc., the air inlet portion 12 of the planar metal reinforcing material 9 that is exposed at the air inlet 7 can be used as it is as the dustproof air intake device 8. Manufacturing costs are lower.

Since the robustness of the fan case body 6 is enhanced by the planar metal reinforcing material 9, its durability can be maintained at a high level.

[effect] The present invention has the following effects (1) to (2).

■The fan case body, which has a synthetic resin flesh part, does not resonate with engine vibrations, and there is no room for large vibration noise to be emitted from the fan case body, so noise is reduced.

■When molding the fan case body using simple injection molding, compression molding, etc., the air intake part of the planar metal reinforcing material that is exposed at the air intake can be used as it is as a dustproof air intake, reducing manufacturing costs.

■The robustness of the fan case body is increased by the planar metal reinforcing material, so its durability can be maintained at a high level.

[Example] Embodiments of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 13 indicates a partially oil-cooled forced air-cooled diesel engine.

In this engine 13, a cylinder head 31 and a head cover 16 are sequentially assembled on the upper side of a cylinder 33 formed at the upper part of a cylinder block 15, a centrifugal fan 1 is provided in the front part of the cylinder block 15, and a centrifugal fan 1 is installed in a fan case 1.
4, a fuel tank 17 and a muffler 18 are provided on the left and right sides of the head cover 16, an air cleaner 19 is provided in the front of the muffler 18, and an oil cooler 20 is provided in the front of the head cover 16.
It is configured by providing.

The oil cooling mechanism of this engine 13 includes a cylinder block 15
A part of the lubricating oil in the oil pan 21 formed at the lower part of the oil pan 21 is circulated in this order through the oil pump, the oil jacket in the cylinder head 31 (not shown), and the oil cooler 20 by the pumping force of the oil pump (not shown). The structure is such that the cylinder head 31 can be cooled.

In addition, the air cooling mechanism takes outside air into the fan case 14 from the air intake port 7 by the bow suction force of the centrifugal fan 1, and draws it into the fan case 14 through the suction force of the centrifugal fan 1 around the cylinder 33 and into the ventilation passages in the cylinder head 31. 32, it is configured to allow ventilation around the oil cooler 20.

The fan case body 6 of the fan case 14 is configured by integrally forming a case end wall 3 facing the fan outer end surface 2 of the centrifugal fan 1 and a case peripheral wall 5 facing the fan outer peripheral surface 4. A circular air intake port 7 is opened in the air intake port 3, and a dust-proof air suction device 8 is provided in the air intake port 7.

As shown in FIG. 2, the fan case main body 6 is constructed by integrating a synthetic resin flesh part 10 with a series of planar metal reinforcing members 9 that maintain the shape of the main body. The reinforcing material 9 is made of a net material, and as shown in FIG. 1, a large number of small holes 11 are arranged closely over the entire surface thereof.

The fan case body 6 is molded by housing a planar metal reinforcing material 9 in the formwork of an injection molding machine and press-fitting a synthetic resin such as polypropylene into the formwork. Since a part of the material 9 is exposed across the air intake port 7, the air intake port portion 12 of the planar metal reinforcing material 9 is used as it is as the dust-proof air intake tool 8.

Case mounting brackets 22, as shown in FIG. The bulging portion 23 is bulged to the outside of the case, the bracket fitting bulging portion 23 is fitted to the case mounting bracket 22, and the bracket fitting bulging portion 2 is fitted.
3 and the case mounting bracket 22.
interposed between the bracket fitting bulge 23 and the vibration isolating rubber 2.
4 and the case mounting bracket 22 are collinear with the case mounting bolt 25, and the fan case 14 is removably fixed to the cylinder block 15, so that transmission of vibration from the cylinder block 15 to the fan case 14 can be buffered. It's Nishide.

As shown in FIG. 1, the left and right sides of the cylinder block 15, the front side of the fan case 14, and the upper side of the head cover 16 are respectively opposed to soundproof plates 27 attached via soundproof plate mounting brackets 26. is the board 28
A sound absorbing material 29 made of urethane sponge is attached to the inner surface of the cylinder block 15 to reduce noise emitted from the cylinder block 15 and the like to the surroundings.

A ventilation gap of a predetermined width is formed between the cylinder block 15 etc. and the soundproof plate 27 by a soundproof plate mounting bracket 26, so that the heat radiation of the engine 13 is not obstructed by the soundproof plate 27.

The soundproof plate 27 attached to the upper side of the head cover 16 has its front end edge 30 led out to the upper side of the oil cooler 2o,
It may be possible to reduce the noise emitted from the fan case 14 to the oil cooler 20 side.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining a fan case of a centrifugal fan according to an embodiment of the present invention. FIG. 1 is a perspective view of the engine, and FIG. 2 is a cross-sectional view taken along the line The end view and FIG. 3 are perspective views of the fan case mounting portion. FIG. 4 is an explanatory diagram of the prior art. 1...Centrifugal fan, 2...Fan outer end surface, 3...
Case end wall, 4... Fan outer circumferential surface, 5... Case circumferential wall, 6... Fan case body, 7... Air intake port, butt.
, dustproof wind absorber, 9... planar metal reinforcing material, 10...
Flesh part, 11...small hole, 12...9 air intake port part. Patent applicant Ribota Co., Ltd.

Claims (1)

[Claims] 1. A case end wall 3 facing the fan outer end surface 2 of the engine cooling centrifugal fan 1 and a case peripheral wall 5 facing the fan outer peripheral surface 4 are integrally formed to form a fan case body 6. In a fan case of a centrifugal fan for engine cooling, which has an air intake port 7 opened in the case end wall 3 and a dust-proof air suction device 8 provided in the air intake port 7, the fan case main body 6
is a series of planar metal reinforcing members 9 that maintain the shape of the main body, and a synthetic resin flesh part 10.
The planar metal reinforcing material 9 has a large number of small holes 11 arranged closely over its entire surface, and the air intake port part 12 of the planar metal reinforcing material 9 is connected to the dustproof A fan case of a centrifugal fan for engine cooling, configured as an air suction device 8.