JP2008121643A - Engine equipped with member made of resin material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine equipped with engine components such as an oil pan and the like having a simple and lightweight structure, capable of being installed with small assembly man-hours and reduced in manufacturing cost. <P>SOLUTION: The engine is characterized in that the oil pan or a gear case which is mounted to the under side of a crankcase and receives oil inside is formed of single resin material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine provided with a resin member made of a resin material such as an oil pan, a gear case, and a rocker cover.

An oil pan, which is attached to the lower surface of the crankcase and accommodates oil dropped from the inside of the engine, is usually composed of a welded structure of thin steel plates. Since the oil pan is made of a thin steel plate, it is likely to be a noise generation source due to the propagation of vibration generated in the crankcase.
Therefore, various means for reducing the noise of the oil pan are provided, and one of them is a technique provided in Patent Document 1 (Japanese Patent Laid-Open No. 8-42395).

  In the technique of Patent Document 1, an outer container made of a resin material is placed on the outer side of an inner container formed of a metal plate, and the space in the plate surface direction of the oil pan is placed between the outer surface of the inner container and the inner surface of the outer container. The damping liquid is enclosed in the space, and the noise radiated from the outer surface of the oil pan is reduced by the vibration damping capability of the damping liquid and the vibration damping due to the elastic deformation of the outer container made of a resin material. .

JP-A-8-42395

However, in the technique of Patent Document 1 (Japanese Patent Laid-Open No. 8-42395), a three-layer structure of an attenuation liquid filling space formed between an inner container made of a metal plate and an outer container made of a resin material. Since the noise radiated from the outer surface of the oil pan is reduced, the structure is complicated and the weight is increased.
In addition, when assembling the oil pan, the damping liquid is sealed in the space formed between the inner container made of metal plate and the outer container made of resin material while preventing leakage, so that the number of assembling steps of the oil pan is increased. .

  Therefore, in the prior art, although the effect of preventing noise propagation from the oil pan can be achieved, the three-layer structure makes the structure complicated and heavy, and increases the number of assembly steps for the oil pan. In addition, there is a problem to be solved such as an increase in the manufacturing cost of the oil pan.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide an engine having an engine component such as an oil pan that is simple and lightweight, can be installed with a small number of assembly steps, and has a reduced manufacturing cost. .

The present invention achieves such an object, and is characterized in that an oil pan which is attached to the lower surface of an engine crankcase and contains oil therein is made of a single resin material.
Further, the present invention is characterized in that a gear case that is attached to the front surface or the rear surface of the crankcase and that houses a gear therein is formed of a single resin material.
Further, the present invention is characterized in that an engine component having a radiation surface for noise caused by engine vibration including a rocker cover is formed of a single resin material.

  As the resin material, specifically, hard vinyl chloride resin, vinylidene chloride resin, ABS, polypropylene, nylon, acetal resin, fluororesin, polycarbonate, methylpentene resin, phenol resin, melamine resin, furan resin, epoxy It is preferable to use any one of resin, unsaturated polyester resin, and diallyl phthalate resin.

  According to the present invention, the engine component including the engine oil pan, the gear case, and the oil pan and the rocker cover including the noise emission surface of the engine vibration is made of the resin material having a large vibration damping capacity. The vibration propagated from the oil pan to the gear case and the like and the vibration of the rocker cover can be damped by internally absorbing with the resin material. Therefore, the vibration causes the oil pan and the gear case and the rocker cover from the outer surface. The emitted noise can be reduced.

Therefore, according to the present invention, the oil pan, the gear case, the rocker cover, and the like are formed of a single resin material, so that the oil pan having the three-layer structure according to Patent Document 1 (Japanese Patent Laid-Open No. 8-42395) is provided. Compared to the conventional technology such as the oil pan of Patent Document 1, the weight is lighter because the structure is simple and the oil pan and the gear case are configured with a single resin material having a small specific gravity. Since it is a single resin material, it is easier to assemble and assemble with fewer assembling steps than those in which an attenuation liquid such as an oil pan of Patent Document 1 is enclosed. Thereby, compared with the said prior art, the cost of an oil pan, a gear case, a rocker cover, etc. becomes cheap.
Further, since the resin material itself has a sealing function, the gasket on the connection surface between the oil pan and the gear case and the crankcase is not necessary, and the number of parts and parts cost can be reduced and the assemblability is improved.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example.

FIG. 1 is a partial cross-sectional view (cross-sectional view perpendicular to the crankshaft center) in the vicinity of an oil pan of an engine according to a first embodiment of the present invention.
In FIG. 1, an engine 100 includes a crankcase 2, an oil pan 1 that is fixed to a lower surface of the crankcase 2 by a plurality of bolts (not shown), accommodates falling oil from the inside of the engine 100, a piston 3, a crank Axis 4 etc. are provided.
In the first embodiment, the oil pan 1 is integrally constituted by a single resin material made of a material as will be described later.

2A is a partial longitudinal sectional view (sectional view along the crankshaft) in the vicinity of a gear case of an engine according to a second embodiment of the present invention, and FIG. 2B is a sectional view taken along line AA in FIG. .
In FIG. 2, the gear case indicated by reference numeral 5 is attached to the front or rear surface of the crankcase 2 by a plurality of bolts inserted into the bolt holes 5c of FIG. Gears such as the gear 6 and the idler gear 8 are accommodated.
Reference numeral 7 in FIG. 2A denotes an accessory driving pulley fixed to the end of the crankshaft 4 concentrically with the crankshaft 100a.
In the second embodiment, the gear case 5 is integrally formed of a single resin material made of a material as will be described later.

  In addition to the oil pan and the gear case, the engine component having a radiation surface for noise caused by engine vibration, such as a rocker cover, a gear case cover, and a flywheel cover, specifically, a single resin material made of the above material. Can be configured.

The single resin material constituting the oil pan 1 in the first embodiment, the single resin material constituting the gear case 5 in the second embodiment, and the engine components in the third embodiment are specifically Consists of one of the following materials.
That is, the resin material includes hard vinyl chloride resin, vinylidene chloride resin, ABS, polypropylene, nylon, acetal resin, fluororesin, polycarbonate, methylpentene resin, phenol resin, melamine resin, furan resin, epoxy resin, unsaturated polyester. Any one of resin and diallyl phthalate resin is used.

  According to the first, second, and third embodiments, the engine has an emission surface for noise caused by engine vibration other than the oil pan 1 and the gear case 5 such as the engine oil pan 1 and the gear case 5 and the rocker cover. Since the parts are made of a resin material having a large vibration damping capacity, vibrations transmitted from the crankcase 2 side to the oil pan 1, the gear case 5, the rocker cover, etc. can be damped by internally absorbing the resin material. Therefore, noise emitted from the outer surfaces of the oil pan 1, the gear case 5, the rocker cover, and the like due to the vibration can be reduced.

Therefore, according to this embodiment, the oil pan 1, the gear case 5, the rocker cover, and the like are formed of a single resin material, so that the structure is simpler than that of the three-layer oil pan according to Patent Document 1. In addition, since the oil pan 1 and the gear case 5 and the like are made of a single resin material having a small specific gravity, the weight is lighter than that of the prior art such as the oil pan of Patent Document 1, and moreover, Since it is a resin material, it is easier to assemble and assemble with a smaller number of man-hours than the one that fills the damping liquid such as the oil pan of Patent Document 1. Thereby, compared with the said prior art, the cost of an oil pan, a gear case, etc. becomes cheap.
Further, since the resin material itself has a sealing function, gaskets for the connection surface 1a between the oil pan 1 and the crankcase 2 and the connection surface 5b between the gear case 5 and the crankcase 2 are not necessary, and the number of parts and Parts cost can be reduced and assemblability is improved.

  According to the present invention, it is possible to provide an engine having an engine component such as an oil pan that is simple and lightweight, can be installed with a small number of assembly steps, and has a reduced manufacturing cost.

1 is a partial cross-sectional view (cross-sectional view perpendicular to a crankshaft center) in the vicinity of an oil pan of an engine according to a first embodiment of the present invention. (A) is the fragmentary longitudinal cross-sectional view (sectional view which follows a crankshaft center) of the gear case vicinity of the engine which concerns on 2nd Example of this invention, (B) is the sectional view on the AA line in (A).

Explanation of symbols

1 Oil pan 2 Crankcase 5 Gear case 100 Engine

Claims (4)

  An engine having a resin member, wherein an oil pan attached to the lower surface of a crankcase and containing oil is made of a single resin material.   An engine provided with a resin material member, characterized in that a gear case which is attached to a front surface or a rear surface of a crankcase and houses a gear therein is made of a single resin material.   An engine having a resin member, wherein an engine component having a radiation surface for noise caused by engine vibration including a rocker cover is made of a single resin material. As the resin material, hard vinyl chloride resin, vinylidene chloride resin, ABS, polypropylene, nylon, acetal resin, fluororesin, polycarbonate, methylpentene resin, phenol resin, melamine resin, furan resin, epoxy resin, unsaturated polyester resin, diallyl The engine provided with the resin-made member according to any one of claims 1 to 3, wherein any one of phthalate resins is used.

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