JPH0727016A - Resinous oil pan and its manufacture - Google Patents

Abstract

PURPOSE:To get excellent strength and shock resistance by forming the first layer by fiber-reinforced resin and, outside the first layer, the second layer by zincropentadien resin. CONSTITUTION:An oil pan 1 has a flange part 2a attached to the bottom of a cylinder block 4, and it is made in double structure consisting of the first layer 2, where engine oil is reserved, and the second layer 3 constituting its top coat. Fiber-reinforced resin is used for the first layer 2 constituting the inner layer of the oil pan 1, and zincropentadien resin for the second layer 3 constituting its top coat. What is more, the second layer 3 is provided integrally on the first layer 2, within the range of not lying upon the flange part 2a. Hereby, the inward transformation of the oil pan 1 by the collision with a margin stone or the like can be suppressed, and the danger of breakage of internal parts such as a crank, etc., reduced, and also the break of the oil pan 1 prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan made of resin which is mounted on a lower portion of a cylinder block of an engine and a method for manufacturing the oil pan.

[0002]

2. Description of the Related Art Conventionally, at the bottom of a cylinder block,
An oil pan that stores engine oil for cooling and lubrication inside the engine is fastened. As the oil pan, there has been proposed a product made of sheet metal, a product made by injection-molding a synthetic resin, or a product made of a fiber-reinforced resin containing glass fiber or the like.

[0003]

In the above-mentioned sheet metal or oil pan made of synthetic resin, when hitting a curb or the like,
The oil pan itself is less likely to break due to deformation,
Although oil leakage can be prevented, the deformed part may interfere with internal parts such as the crank and there is a risk of damage.

Further, in the oil pan made of a reinforced resin containing glass fiber or the like, the rigidity of the flange portion and the like can be secured, but there is a problem that it is easily broken.

[0005]

Therefore, in the resin oil pan of the present invention, the first layer portion is molded with a fiber reinforced resin having excellent strength and heat resistance, and the first layer portion is arranged in a molding die. After that, a dicyclopentadiene-based resin having excellent impact resistance was injected into the molding die by the reaction injection molding method to mold the second layer portion outside the first layer portion.

[0006]

[Function] The first layer portion is molded with a fiber reinforced resin having excellent strength and heat resistance, and after the first layer portion is placed in the molding die, the reaction injection of dicyclopentadiene resin having excellent impact resistance is performed. Since the second layer portion is formed outside the first layer portion by injection into the mold by the molding method, a double structure is formed, and the impact from the outside on the oil pan is buffered by the second layer portion, The impact force transmitted to the first layer is reduced. Further, since the first layer portion is formed of a strong resin, deformation of the oil pan due to impact can be suppressed.

[0007]

1 and 2, reference numeral 1 indicates an oil pan. This oil pan 1 has a flange portion 2a attached to the lower portion of a cylinder block 4, and is a double layer composed of a first layer portion 2 for storing engine oil (not shown) and a second layer portion 3 forming its exterior. It is molded into a structure.

A fiber reinforced resin is used for the first layer portion 2 forming the inner layer of the oil pan 1, and a dicyclopentadiene resin is used for the second layer portion 3 forming the exterior. The second layer portion 3 is integrally provided on the first layer portion 2 within a range where it does not overlap with the flange portion 2a.

Now, a method of manufacturing the oil pan 1 will be described. First, the first layer portion 2 is preformed by a fiber reinforced resin, and then a reaction injection molding (hereinafter referred to as "RIM") molding, which is a reaction injection molding of a dicyclopentadiene resin having excellent impact resistance. Is injected outside the first layer portion 2 to form the second layer portion 3.

For example, as shown in FIG. 3A, a polyethylene-based stampable sheet 6 which is a thermoplastic material as a fiber reinforced resin member formed in a sheet shape on a female die 5A of a press 5 is heated. The oil pan main body as the first layer portion 2 is formed by arranging it above and closing the mold as shown in FIG. 3 (b) to press it, or as shown in FIG. A solution of a fiber reinforced resin, in which glass fibers (not shown) are melted, is supplied from a runner 9 from a pouring machine (not shown) to a capital 8 formed in the first layer portion 2 formed between the male mold 7A and the female mold 7B. And injection molding the first layer 2
To form.

Next, as shown in FIG. 5, the first layer portion 2 is set in a RIM molding die 10 in which the second layer portion 3 is imitated. Then, a predetermined amount of both solutions are discharged at predetermined timing from the storage tanks 11 and 12 containing the solutions A and B having different viscosities forming the dicyclopentadiene-based resin which is a thermosetting resin, and are indicated by a chain double-dashed line. Mixing is performed by the mixing head 13 provided in the confluence part, and the mixed solution is injected from the melt passage 10A formed in the mold 10 into the capital 14 formed by the mold and the first layer part 2 to form the second layer part. 3 first
It is welded to the outside of the layer 2.

In the present embodiment, the first layer portion 2 is formed of a fiber reinforced resin containing glass fibers or a polyethylene type stamped sheet 6, but in addition to this, a nylon type stampable sheet or a polycarbonate type long fiber reinforced resin is used. Alternatively, a sheet molding compound (commonly referred to as “SMC”) obtained by impregnating a glass mat or glass fiber with polyester or the like and curing the mixture halfway may be used. That is, the first thermoplastic resin having reinforcing fibers
It is desirable that the layer portion is molded and the second layer portion 3 is composed of a dicyclopentadiene resin which is a thermosetting resin having excellent impact resistance.

As described above, the second layer portion 3 superposed on the first layer portion, which is the main body, is made of a resin having excellent impact resistance 3, so that the second layer portion 3 is not affected by curbs or the like. Even if you hit, you can absorb the impact. Therefore,
The impact on the first layer portion 2 is reduced, and the first layer portion 2
Will prevent cracking.

Further, since the second layer portion 3 made of a thermosetting resin having excellent impact resistance is not polymerized on the flange portion 2, the risk of cracking at the time of fastening to the cylinder block 4 is reduced. At the same time, since it is strengthened by the reinforcing fiber typified by glass fiber, the flange portion 2a can be made strong even though it is a plastic resin.

That is, when the content of the reinforcing fiber in the flange portion 2a is large, the amount of the resin in the flange portion 2a relatively decreases, so that the deformation of the flange portion 2a due to heat can be suppressed. Therefore, the fluctuation of the tightening torque between the cylinder block 4 and the flange portion 2a can be reduced, which leads to the improvement of the sealing property.

[0016]

As described above, according to the present invention, the first layer portion of the oil pan including the flange portion is formed of a fiber-reinforced resin having strength, and the outer side thereof is formed of a dicyclopentadiene-based resin having excellent impact resistance. Since it has a double structure that forms two layers, it suppresses internal deformation of the oil pan due to collision with curbs, etc., reduces the risk of damage to internal parts such as the crank, and prevents cracks in the oil pan. can do.

[Brief description of drawings]

FIG. 1 is a perspective view of a resin oil pan showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the resin oil pan shown in FIG.

3 (a) and 3 (b) are side views showing a manufacturing process of the first layer portion.

FIG. 4 is a side view showing the manufacturing process of the first layer portion.

FIG. 5 is a side view showing the manufacturing process of the second layer portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin oil pan 2 1st layer part 2a Flange part 3 2nd layer part 4 Cylinder block 6 Sheet-like fiber reinforced resin member A, B Dicyclopentadiene system resin

Claims (7)

[Claims] 1. A resin oil comprising a first layer portion formed of a fiber reinforced resin and a second layer portion formed of a dicyclopentadiene resin bonded to the outside of the first layer portion. Bread. 2. The resin oil pan according to claim 1, wherein the first layer portion has a flange portion at an edge portion thereof on which the second layer portion is not polymerized. 3. The first layer portion is formed by molding the first layer portion with a fiber reinforced resin, arranging the first layer portion in a molding die, and then injecting a dicyclopentadiene resin by reaction injection molding. A method for manufacturing a resin oil pan, wherein a second layer portion is formed on the outer side of the. 4. The method of manufacturing a resin oil pan according to claim 3, wherein the first layer portion is formed by press-molding a fiber-reinforced resin member which is previously formed in a sheet shape. 5. The method of manufacturing a resin oil pan according to claim 3, wherein the first layer portion is formed by injection molding a fiber reinforced resin. 6. The method for producing a resin oil pan according to claim 1, wherein the fiber reinforced resin contains glass fibers. 7. The method for producing a resin oil pan according to claim 4, wherein the fiber reinforced resin member is made of polyethylene, a nylon type stampable sheet, a polycarbonate type long fiber reinforced resin, or a sheet molding compound.