JPH0118827Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of an oil pan using vibration-damping steel plates in an internal combustion engine.

[Prior Art] As an oil pan for suppressing engine combustion noise, an oil pan has been proposed in which a damping plate with lubricating oil permeated into the inner wall surface is combined, as shown in Japanese Utility Model Application Publication No. 53-28338, for example. has been done. In recent years, instead of such damping plates, damping steel plates have been developed that are made by interposing a resin layer between two steel plates. If an oil pan is made by press forming using such a damping steel plate, processing becomes very easy. However, delamination may occur at the cut edges of damping steel plates during press forming, and after long-term use, there is a risk that water may enter the delaminated areas from the outside and cause corrosion.

[Problems to be solved by the invention] The purpose of the invention is to provide an oil pan structure using vibration-damping steel plates with excellent durability, in which the covering material covering the cut edge will not peel off due to vibration etc. It's about doing.

[Means for Solving the Problem] In order to achieve the above object, the structure of the present invention is such that the outer peripheral edge is folded downward onto the flange of the oil pan which is overlapped with the lower end wall surface of the crankcase via packing. A hanging edge is formed by extending the outer peripheral edge of the packing along the hanging edge, and the extended edge is folded back to cover both sides of the hanging edge.

[Function] According to the present invention, the covering material covering the cut edge of the hanging edge 13 of the flange of the oil pan is
The extended edge 17a of 7 is folded back to cover both sides of the hanging edge 13. Therefore, the cut edge is completely covered by the folded portion 17b of the extended edge 17a, and water and the like are prevented from entering the overlapping surface of the steel plates at the cut edge.

Since the extended edge 17a is constructed integrally with the packing 17, as long as the oil pan is connected to the crankcase, it will not come off even if subjected to vibrations.

[Embodiment of the invention] As shown in Fig. 1, the oil pan 2 according to the invention is integrally formed with a known vibration-damping steel plate made by interposing a resin layer between two steel plates. , the flat flange 3 formed at the opening edge of the oil pan 2 is stacked on the lower end wall surface of the crankcase 5 with the packing 18 in between, as shown in FIG. A bolt 6 inserted through the hole 4 is screwed into the crankcase 5 and fixed. In order to prevent water from entering the bolt holes 4 of the flange 3, the seat plate 20 is made of a metal plate 22 with rubber layers 21 baked on both sides, as shown in FIG.

According to the present invention, for an oil pan made of a damping steel plate, the hanging edge 13 is formed by folding back the outer edge of the flange 3 which overlaps the lower end wall surface of the crankcase 5 downward, and the cut edge of this hanging edge 13 The edge is covered by a grommet 19 integral with the packing 18 and having a U-shaped cross section. In other words, the outer peripheral edge of the packing 18 is extended along the hanging edge 13, and the cut edge of the hanging edge 13 is covered by the grommet 19 formed by folding the end of the extended portion back into a U-shape.

Therefore, according to the present invention, even if water splashes up and adheres to the hanging edge 13 when the vehicle runs through a puddle on the road, the grommet 19 prevents the water from flowing from the cut edge to between the layers of the damping steel plate. Deep penetration is prevented.

Grommet 1 for sealing the cut edge of the hanging edge 13
9 is integrated with the packing 18, so there is no fear that the grommet 19 will come off. Furthermore, forming the packing 18 and the grommet 19 as a water seal member in one piece is more advantageous than manufacturing them separately.
Manufacturing and assembly costs are reduced.

As shown in FIG. 4, when the packing 17 is made of a relatively hard material, the outer peripheral edge of the packing 17 is bent downward to form an extended edge 17a, and the lower edge is further folded back. The cut edge of the hanging edge 13 of the flange 3 is covered by the folded edge 17b.

[Effects of the invention] As described above, the present invention has the outer peripheral edge of the flange of the oil pan, which is overlapped with the packing on the lower end wall of the crankcase, folded downward to form a hanging edge, and the packing is attached to the flange of the oil pan. The extended edge formed by extending the outer peripheral edge along the hanging edge is folded back to cover both sides of the hanging edge, and since the extended edge of the packing is folded back to cover both sides of the hanging edge, the cut edge is The folded portion of the extended edge completely covers the cut edge and prevents water from entering the overlapping surface of the steel plates at the cut edge.

Since the extension edge is integrated with the packing,
It is easy to manufacture and assemble, and as long as the oil pan is connected to the crankcase, it will not come off even when subjected to vibrations and has excellent durability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the schematic structure of the oil pan;
Fig. 2 is a side cross-sectional view of an oil pan using a damping steel plate according to the present invention, Fig. 3 is a side cross-sectional view of a seat plate attached to a bolt that fixes the oil pan, and Fig. 4 is a side cross-sectional view of an oil pan using a damping steel plate according to the present invention. FIG. 2 is a side sectional view of an oil pan using a damping steel plate according to a second embodiment. 2: Oil pan, 3: Flange, 5: Crankcase, 13: Hanging edge, 19: Grommet, 1
7, 18: Packing, 17a: Extension edge, 17
b: Folded edge.

Claims (1)

[Scope of utility model registration request] An extension formed by folding the outer peripheral edge of the flange of the oil pan, which is overlapped with the lower end wall of the crankcase via packing via a packing, to form a hanging edge, and extending the outer peripheral edge of the packing along the hanging edge. An oil pan structure using vibration-damping steel plates characterized by folding back the edges and covering both sides of the hanging edges.