JPH11280548A - Oil pan structure for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of a boundary part of a deep bottom part and a shallow bottom part, and loose stress concentration on the boundary part by integratedly forming reinforcing ribs for connecting a rear wall part of the deep bottom part and a bottom wall part of the shallow bottom part to each other. SOLUTION: A sheet metal made oil pan 1 is provided with a deep bottom part 2, a shallow bottom part 3, and a flange part 4, and they are integratedly formed by means of press work. In such constituted oil pan 1, a pair of reinforcing ribs 11, 12 for connecting a bottom wall part 35 of the shallow bottom part 3 and a rear wall part 24 of the deep bottom part 2 to each other are integratedly formed, grooves 17, 18 for connecting the shallow bottom part 3 and the deep bottom part 2 to each other are defined by respective reinforcing ribs 11, 12, and a front part of the shallow bottom part 3 is held between the grooves 17, 18. Rib bottom wall parts 15, 16 of respective reinforcing ribs 11, 12 are bent and formed, curvature radius of each rib bottom wall part 15, 16 is formed larger than that of a corner part 20. It is thus possible to improve rigidity of a boundary part of the deep bottom part 2 and the shallow bottom part 3, and it is also possible to loose stress concentration thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan structure for an engine.

[0002]

2. Description of the Related Art An oil pan needs to have sufficient rigidity against an input from an engine body.
No. 8649, JP-A-6-58111, JP-A-6-53745).

[0003] Conventionally, there is an apparatus provided with a sheet metal oil pan integrally formed with a deep bottom portion for storing lubricating oil and a shallow bottom portion for allowing the lubricating oil to flow down to the deep bottom portion.

[0004]

However, in such a conventional oil pan structure made of sheet metal, a corner connecting the shallow bottom and the deep bottom in order to suppress the fluctuation of the lubricating oil surface accumulated in the deep bottom. If the radius of curvature is reduced, stress concentration may easily occur at this corner.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to suppress fluctuation of a lubricating oil surface and reduce stress concentration at a boundary between a shallow portion and a deep portion in an engine oil pan structure. With the goal.

[0006]

The invention according to claim 1 is applied to a sheet metal oil pan of an engine having a deep portion for storing lubricating oil and a shallow portion for flowing lubricating oil to the deep portion.

The reinforcing ribs connecting the deep bottom rear wall and the shallow bottom wall are integrally formed.

According to a second aspect of the present invention, in the oil pan structure for an engine according to the first aspect, the reinforcing rib is defined by a rib bottom wall portion and a rib side wall portion continuous with the left and right side wall portions of the shallow bottom portion. To be formed.

According to a third aspect of the present invention, in the engine oil pan structure according to the first or second aspect, the rib bottom wall is curved in an arc shape from the deep bottom rear wall to the shallow bottom wall. It was formed by forming.

According to a fourth aspect of the present invention, in the engine oil pan structure according to the first or second aspect, the bottom wall of the reinforcing rib is linearly formed from the rear wall of the deep bottom to the shallow bottom wall. To be formed.

[0011]

In the oil pan structure for an engine according to the present invention, the reinforcing rib connecting the rear wall portion of the deep bottom portion and the bottom wall portion of the shallow bottom portion is integrally formed, so that the deep bottom portion and the shallow bottom portion are formed. The rigidity of the bottom boundary portion is increased, and the concentration of stress on this boundary portion is reduced.

Although the grooves defined by the reinforcing ribs increase the opening area of the deep bottom, the formation of the reinforcing ribs partially allows the lubricating oil surface accumulated in the deep bottom to sufficiently sway. It is possible to prevent the lubricating oil from being sucked up poorly.

In the oil pan structure for an engine according to the second aspect, each of the reinforcing ribs is formed so as to define a groove by a rib bottom wall portion and a rib side wall portion that are continuous with the left and right side wall portions of the shallow bottom portion. Since the grooves are arranged on both sides of the shallow portion, the fluctuation of the lubricating oil surface accumulated in the deep portion via each groove can be suppressed from becoming large, and it is possible to prevent the lubricating oil from being sucked up poorly. .

In the oil pan structure for an engine according to the third aspect, the rib bottom wall portion is formed to be curved in an arc shape, so that the lubricating oil surface accumulated in the deep bottom portion via each groove has a large fluctuation. And rigidity at the boundary between the deep bottom and the shallow bottom can be effectively increased.

In the oil pan structure for an engine according to the fourth aspect, the bottom wall of the reinforcing rib is formed linearly from the rear wall of the deep bottom to the bottom wall of the shallow bottom, thereby forming the deep bottom and the shallow bottom. The stiffness of the boundary portion can be effectively increased.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, an oil pan 1 made of sheet metal is connected to a deep bottom portion 2 for storing lubricating oil, a shallow bottom portion 3 for guiding lubricating oil to the deep bottom portion 2, and an engine body (not shown). And these are integrally formed by press working. The engine main body is mounted so that a crankshaft (not shown) extends in the front-rear direction of the vehicle, and the oil pan is mounted such that the deep bottom portion 2 is located forward of the shallow bottom portion 3 of the vehicle.

The flange portion 4 has a plurality of holes 41 opened at predetermined intervals. Bolts (not shown) inserted into the holes 41 fasten the flange portion 4 to the engine body via a fixing plate 5 joined to the lower surface of the flange 31.

The deep bottom portion 2 includes left and right side wall portions 21 and 22,
A box-like structure is formed by a front wall 23 connecting the front ends of the side walls 21 and 22, a rear wall 24 connecting the rear ends of the side walls 21 and 22, and a bottom wall 25 connecting the lower ends thereof. doing. Two reinforcing ribs 26 are formed on the right wall portion 22. Five reinforcing ribs 27 are formed in the bottom wall portion 25, and a drain hole 28 is opened.

The shallow bottom portion 3 includes left and right side wall portions 31 and 32,
A rear wall portion 34 connecting the rear ends of the side wall portions 31 and 32, and a bottom wall portion 35 connecting the lower ends thereof are provided. Each of the side walls 31 and 32 of the shallow portion 3 is connected to each of the side walls 21 and 22 of the deep portion 2.
And each is continuous. The bottom wall portion 35 of the shallow bottom portion 3 and the rear wall portion 24 of the deep bottom portion 2 are continuous via the corner portion 20 that is curved in an arc shape.

As a gist of the present invention, a pair of reinforcing ribs 11 and 12 connecting the bottom wall 35 of the shallow bottom 3 and the rear wall 24 of the deep bottom 2 are integrally formed. 12, two grooves 17 and 18 connecting the shallow portion 3 and the deep portion 2 are defined, respectively, and the front portion of the shallow portion 3 is sandwiched between the grooves 17 and 18.

The left reinforcing rib 11 includes a rib bottom wall 15 connecting the left side wall 31 and the rib side wall 13, and a right reinforcing rib 12.
Is the rib bottom wall 1 connecting the right side wall 32 and the rib side wall 14
6.

In this embodiment, each rib bottom wall 1
5 and 16 are formed to be curved in an arc shape. The radius of curvature of each of the rib bottom walls 15 and 16 is formed to be larger than the radius of curvature of the corner 20.

Next, the operation of the embodiment of the present invention configured as described above will be described.

The lubricating oil stored in the oil pan 1 is sucked up by an oil pump (not shown) via an oil strainer 4 and supplied to various parts of the engine. The lubricating oil that has lubricated each part of the engine is returned to the oil pan 1 through the crank chamber. The lubricating oil returned to the shallow portion 3 flows down on the shallow portion 3 and returns to the deep portion 2, and the rest passes through the respective grooves 17 and 18 and returns quickly to the deep portion 2. Etc. can be prevented.

The box-shaped oil pan 1 has an angle connecting the bottom wall 35 of the shallow bottom 3 and the rear wall 24 of the deep bottom 2 in order to reduce stress concentrated on the boundary between the deep bottom 2 and the shallow bottom 3. Part 20
There is a demand that the radius of curvature be as large as possible. On the other hand, there is a demand to make the radius of curvature of the corner portion 20 as small as possible in order to suppress the fluctuation of the lubricating oil surface stored in the deep bottom portion 2 due to the vibration of the oil pan 1.

To cope with this, the present invention addresses this problem by providing a pair of reinforcing ribs 1 connecting the bottom wall 35 of the shallow bottom 3 and the rear wall 24 of the deep bottom 2.
The rigidity of the boundary between the deep bottom portion 2 and the shallow bottom portion 3 is increased by integrally forming the first and second portions 12, and concentration of stress on the boundary portion is reduced.

Although the grooves 17 and 18 defined by the reinforcing ribs 11 and 12 increase the opening area of the deep bottom 2, the corners 20 are formed between the reinforcing ribs 11 and 12 on both sides of the shallow bottom 3. The lubricating oil level accumulated in the deep bottom portion 2 due to the sway of the oil pan 1 can be sufficiently suppressed,
It is possible to prevent the lubricating oil from being sucked up poorly.

The rib bottom walls 15 and 16 are formed to be curved in an arc shape, so that the lubricating oil surface stored in the deep bottom portion 25 via the grooves 17 and 18 can be prevented from becoming large. At the same time, the rigidity at the boundary between the deep part 2 and the shallow part 3 can be effectively increased.

As another embodiment, as shown in FIG. 4, the rib bottom walls 15, 16 of the reinforcing ribs 11, 12 may be formed in a straight line.

Also in this case, the reinforcing ribs 11 and 12 increase the rigidity at the boundary between the deep bottom portion 2 and the shallow bottom portion 3 and reduce the concentration of stress at this boundary portion.

[Brief description of the drawings]

FIG. 1 is a plan view of an oil pan according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a cross-sectional view of an oil pan showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil pan 2 Deep bottom 3 Shallow bottom 4 Flange part 11 Reinforcement rib 12 Reinforcement rib 13 Rib side wall part 14 Rib side wall part 15 Rib bottom wall part 16 Rib bottom wall part 20 Corner part 24 Deep bottom part rear wall part 35 Shallow bottom part Bottom wall

Claims (4)

[Claims] An oil pan made of a metal sheet for an engine, comprising: a deep bottom portion for storing lubricating oil; and a shallow bottom portion for allowing the lubricating oil to flow down to the deep bottom portion. A rear wall portion of the deep bottom portion and a bottom wall of the shallow bottom portion An oil pan structure for an engine, wherein reinforcing ribs connecting the parts are integrally formed. 2. The device according to claim 1, wherein the reinforcing ribs are formed so as to define a pair of grooves by a rib bottom wall portion and a rib side wall portion that are continuous with the left and right side wall portions of the shallow bottom portion. Engine oil pan structure. 3. The engine according to claim 1, wherein the rib bottom wall is formed in an arc shape from the rear wall of the deep bottom to the bottom wall of the shallow bottom. Oil pan structure. 4. The engine oil according to claim 1, wherein a bottom wall of said reinforcing rib is formed linearly from a rear wall of said deep bottom to a bottom wall of said shallow bottom. Bread structure.