JPH0547395U - Structure of resin oil pan - Google Patents

Abstract

(57) [Summary] [Purpose] Reduction of the number of parts and improvement of workability [Configuration] Engine cylinder block 3 lower end 4
In the resin-made oil pan to be joined to, the cylinder-block mating surface 5 of the resin-made oil pan 1 is integrally formed with sealing ridges 6 and 6a made of a resin having elasticity.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a resin oil pan that stores engine oil.

[0002]

[Prior Art]

 A resin oil pan that stores engine oil is connected to the lower end of the engine block through a gasket and liquid packing to maintain oil tightness. For example, as shown in FIG. 3, the resin oil pan 10 has its flange 11 overlapped with the flange 13 of the cylinder block 12 and is fixed with a screw 14, but a gasket 15 is provided between both flanges. By being interposed, oil tightness between the cylinder block 12 and the oil pan 10 is maintained. As the oil seal provided on the cylinder / block mating surface of the oil pan 10, there is a means for applying liquid packing in addition to the gasket 15 shown in the figure.

[0003]

[Problems to be solved by the device]

 The need for the gasket 15 in the resin oil pan that contributes to the weight reduction of the engine is a problem in reducing the number of parts. Further, the oil seal using the liquid packing has problems that it is difficult to reuse and the cost is high, and the workability of assembly including maintenance is poor.

Therefore, an object of the present invention is to provide a structure of a resin oil pan that can reduce the number of parts and improve workability.

[0005]

[Means for Solving the Problems]

 The resin oil pan of the present invention is characterized in that a sealing ridge made of elastic resin is integrally formed on the mating surface with the cylinder block.

[0006]

[Operation] When the oil pan is superposed on the lower end of the cylinder block, the sealing ridge formed on the mating surface seals between the oil pan and the cylinder block.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

In FIGS. 1 and 2, for example, on the upper surface of the flange 2 of the oil pan 1 made of nylon resin reinforced with glass fiber, that is, on the mating surface 5 with the flange 4 at the lower end of the cylinder block 3. The seal projection 6 made of elastic polyethylene resin is integrally formed.

The sealing ridge 6 is formed continuously over the entire circumference of the mating surface 5 of the flange 2. The ridge 6 is formed as a ring-shaped ridge 6a around the hole 8 through which the tightening screw 7 is inserted so as to surround the hole 8.

Here, one of the methods for forming the sealing projection 6 will be described. A well-known hot pressing method is one of the methods for forming a resin oil pan, and this method is used. Nylon-based high-strength resin material containing glass fiber is set in the concave mold. On the other hand, an elastic resin material such as polyethylene is set at a position facing the upper surface 5 of the flange 2 in the convex mold of the molding die having the mold portions corresponding to the sealing protrusions 6 and 6a. Then, when the resin material is pressed with both molds that have been heated, the resin material is spread and fused between the molds to form the resin oil pan 1 and the upper surface of the flange 2 has a sealing protrusion. The strips 6 and 6a are integrally formed.

As shown in FIG. 1A, the resin oil pan 1 thus molded has its flange 2 superposed on the flange 4 and then fixed to the cylinder block 3 by the tightening screw 7. . At this time, the sealing projections 6 and 6a are elastically deformed to seal between the two flanges 2 and 4.

The illustrated sealing ridge 6 is formed by one ridge except for the ring-shaped ridge 6a, but it may be formed by a plurality of parallel ridges. This will improve the stability of oil tightness. Further, if the ridges are formed avoiding the screw holes 8, the ring-shaped ridges 6a need not be provided in particular.

[0013]

[Effect of the device]

 As described above, according to the structure of the resin oil pan of the present invention, since the sealing ridges made of the elastic resin are integrally formed on the mating surfaces of the cylinder and the block, the number of parts of the resin oil pan is reduced. This reduces the cost, reduces the cost, and facilitates assembly work including maintenance.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing a main part of a resin oil pan showing an embodiment of the present invention, and FIG. 1 (b) is bb in (a).
A line sectional view, (c) is a cc line sectional view in (a).

FIG. 2 is a perspective view showing an example of the shape of a sealing ridge.

FIG. 3 is a cross-sectional view showing a main part of a conventional resin oil pan.

[Explanation of symbols]

 1 ... Resin oil pan 2 ... Flange 3 ... Cylinder / block 4 ... Flange 5 ... Cylinder / block mating surface 6 ... Sealing protrusion 6a ... Ring-shaped protrusion 7 ... Tightening screws 8 ... Hole

Claims (1)

[Scope of utility model registration request] 1. A resin oil pan connected to a lower end portion of an engine cylinder block, wherein a sealing ridge made of a resin having elasticity is integrally formed on a cylinder block mating surface of the resin oil pan. The structure of the resin oil pan, which is characterized by that.