JPH10196345A - Oil pan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an inclination of an oil level by almost horizontally and extendedly arranging overhang walls outward from left and right side wall lower ends of an upper oil pan, and forming these as a ceiling wall of lateral directional end parts inside of a lower oil pan in the lower oil pan communicated through an opening with the upper oil pan having the opening in a front part of a bottom wall. SOLUTION: An upper oil pan 1 extends over the total length in the lengthwise direction of an engine, and a lower oil pan 2 is positioned in a front part of the upper oil pan 1, and overhangs from the upper oil pan 1 in the width direction of the engine, and secures a necessary oil quantity of the engine. Overhang walls 11 which overhang outward from the left and right side wall lower ends and become a ceiling wall of lateral directional end parts 23a and 23b on the inside 23 of the lower oil pan, are extendedly arranged on the lower ends of left and right side walls 9a of the upper oil pan 1. When a vehicle laterally turns, in an oil level in the lower oil pan 2, an excessive rise by an inclination of the oil level can be restrained by the left and right overhang walls 11 so as to become 8b and 8c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a two-part oil pan for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 8-144848 discloses an oil pan having a two-part structure including an upper oil pan and a lower oil pan. Here, a lower oil pan is connected to a front portion of the upper oil pan, and the lower oil pan projects in the left-right direction more than the upper oil pan. The side wall of the upper oil pan has ribs on the outside at intervals, and the space between the rib and the upper oil pan side wall opens toward the inside of the lower oil pan.

[0003]

However, in the above-mentioned conventional oil pan, when the oil level in the lower oil pan is inclined in the left and right directions of the oil pan when the vehicle turns, for example,
The oil freely enters the space between the upper oil pan side wall and the ribs, so that the oil level in the lower oil pan can be greatly inclined, the engine burns in due to the suction of the strainer air, and the fluctuating oil level and rotation Increased friction due to interference with system parts (such as connecting rod locus)
There is a possibility that bubbles in the oil may increase, the oil temperature may increase, or the oil may deteriorate. In order to prevent this, it is conceivable to provide a baffle plate in the lower oil pan, but in that case, processing to attach the baffle plate by welding etc. is necessary, and joining due to engine vibration, oil fluctuating load, etc. Cracks in the part are a new problem. An object of the present invention is to provide a two-part oil pan that can reduce the inclination of the oil surface without attaching a special baffle plate in the lower oil pan.

[0004]

The present invention to achieve the above object is as follows. An upper oil pan having left, right, front and rear side walls and a bottom wall and having at least one opening at a front portion of the bottom wall; and an upper oil pan coupled to the lower end of the front portion of the upper oil pan via the at least one opening. A lower oil pan having an interior communicating with the inside, wherein the left and right side walls of the upper oil pan extend substantially horizontally outward from the lower ends of the left and right side walls, and the left and right side ends of the inside of the lower oil pan are An oil pan with an overhanging wall that becomes the ceiling wall.

In the oil pan of the present invention, the overhanging wall is provided on the upper oil pan, and the overhanging wall is the ceiling wall at the left and right ends inside the lower oil pan. The overhanging wall works to suppress the inclination of the oil level when the vehicle tries to incline left and right, for example, when turning a vehicle. Since the baffle plate is not provided in the lower oil pan, welding time and cracks in the welded portion, which are generated when the baffle plate is welded to the lower oil pan, do not occur.

[0006]

FIG. 1 shows an oil pan according to an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIGS.
The oil pan according to the embodiment of the present invention is composed of an upper and lower oil pan 2 having an upper and lower oil pan 2 which is divided into two parts. The upper oil pan 1 is made of, for example, aluminum, and the lower oil pan 2 is made of, for example, steel. However,
It is not limited to aluminum or steel. The upper oil pan 1 extends over the entire length of the internal combustion engine in the longitudinal direction, and the lower oil pan 2 is located only at the front of the upper oil pan 1 and has a substantially rectangular shape in plan view. Lower oil pan 2
Extends from the upper oil pan 1 in the width direction of the internal combustion engine to secure a necessary oil amount of the engine. The volume of the lower oil pan 2 is set such that the required oil amount can be secured near the upper end of the lower oil pan 2. The upper oil pan 1 is fixed to the lower end of a cylinder block 9 of the internal combustion engine with bolts 3. The bolt 3 is inserted through a bolt hole 12 formed in a flange at the upper end of the upper oil pan 1. The lower oil pan 2 is attached to a lower end of the upper oil pan 1. The mounting flange 24 of the lower oil pan 2 to the upper oil pan 1 is formed over the entire periphery of the upper end of the lower oil pan 2, and the mounting flange 25 is also formed on the upper oil pan 1 so as to be opposed thereto. The lower oil pan 2 is fixed to the mounting flange 25 of the upper oil pan 1 by bolts 13 at the mounting flange 24.

The upper oil pan 1 has left, right, front and rear side walls 9.
(Left and right side wall 9a, front side wall 9b, rear side wall 9c)
And a bottom wall 15. The front of the bottom wall 15 has at least one opening 21, 14a, 14b, 14c (a large opening 20 at the front, a relatively small opening 1 behind it).
4a, 14b, 14c) are formed.
Upper oil pan 1 through 0, 14a, 14b, 14c
The inside 22 of the lower oil pan 2 is communicated with the inside 22 of the lower oil pan 2. The inside 23 of the lower oil pan 2 has a volume substantially equal to the amount of oil stored in the engine oil pan. When the oil level 8 is in a horizontal state, the oil level 8 is substantially at the upper end of the lower oil pan 2. The oil strainer 6 is inserted vertically through the interior 22 of the upper oil pan 1 and through the opening 20,
It extends to the lower part of the inside 23 of the lower oil pan 2,
The suction port is opened at a lower portion of the inside 23 of the lower oil pan 2.

At the lower ends of the right and left side walls 9a of the left and right front and rear side walls 9 of the upper oil pan 1, the right and left side wall lower ends are extended almost horizontally outwardly from the left and right side walls. An overhanging wall 11 is extended. The left and right side walls of the upper oil pan 1 have their skirts smoothly curved outward and are smoothly connected to the overhanging wall 11. Portions of the mounting flange 25 of the upper oil pan 1 corresponding to the left and right sides of the oil pan are formed at outer ends of the overhanging wall 11. The lower surface of the overhanging wall 11 is
Is in a horizontal position, and is substantially at the same height as the oil level 8.

A rib 10 orthogonal to the upper surface of the overhanging wall 11 is formed between the upper surface of the overhanging wall 11 and the outer surfaces of the left and right side walls 9a of the upper oil pan 1. The rib 10 is desirably arranged so as to connect the connection bolt 3 to the cylinder block 19 and the connection bolt 13 to the lower oil pan 2 in plan view of FIG. At the same time, the rib 10 can effectively receive the load pushing up the oil in the lower oil pan 2 when the vehicle turns. The ribs 10 are formed only on the upper surfaces of the left and right overhanging walls 11.

An opening 20 is formed in the bottom wall 15 of the upper oil pan 1.
A raised portion 16 is formed immediately behind the boss. Also, the raised portion 1 of the bottom wall 15 of the upper oil pan 1
6 and a rear wall 9c, a plurality (for example, 2) rising from the bottom wall 15 and extending in the longitudinal direction of the internal combustion engine.
) Are formed on the bottom wall 15.
Of the portion, a portion directly above the lower oil pan 2 and a portion behind the raised portion 16 are formed by a plurality of (for example, three) regions 15a, 15b, and 15c by ribs 18a and 18b.
Are divided into Then, the openings 14a, 14b, 14
c is provided in each of the regions 15a, 15b, and 15c.

A boss portion 26 rising from the bottom wall 15 is formed in a portion of the bottom wall 15 of the upper oil pan 1 that is located behind the openings 14a, 14b, 14c and directly above the flange 24 of the lower oil pan 2. Have been. The boss 26 and the rear side wall 9c of the bottom wall 15 of the upper oil pan 1 are also provided.
A plurality (for example, two) of ribs 17a and 17b rising from the bottom wall 15 are formed in a portion between the ribs 17a and 17b. The ribs 17a and 17b are provided on the ribs 18 when viewed in the width direction of the internal combustion engine.
a, 18b, and the ribs 18a, 18b
And in the longitudinal direction of the internal combustion engine. Rib 17
a, 17b and ribs 18a, 18b
The rigidity of the bottom wall 15 is increased to prevent vibration and noise. Also, ribs 17a, 17b, ribs 18a, 18b
Guides the oil falling from the upper part of the engine and returns it to the lower oil pan 2 through the openings 14a, 14b, 14c. No rib is formed inside the lower oil pan 2 for suppressing oil fluctuation, and therefore, there is no weld between the rib and the inner surface of the lower oil pan 2.

Next, the operation will be described. When the vehicle is turning left and right, the oil level 8 in the lower oil pan 2 is 8b shown in FIG.
8c, the excessive rise due to the inclination of the oil level is suppressed by the lower surfaces of the left and right overhanging walls 11. As a result, the suction port at the lower end of the strainer 6 is suppressed from coming out above the oil level, and the strainer 6 does not suck air. As a result, the seizure of the engine due to the suction of the air by the strainer 6, the increase in friction due to the interference between the fluctuating and raised oil level and the rotating system components, the increase in bubbles in the oil, the increase in the oil temperature, and the deterioration of the oil are suppressed.

When the vehicle suddenly starts, the oil level 8 in the lower oil pan 2 becomes 8a shown in FIG. 2, and the excessive rise due to the inclination of the oil level causes the bottom wall 15 of the upper oil pan 1 It is suppressed by the lower surface of the portion behind the openings 14a, 14b, 14c and ahead of the boss portion 26. As a result, the suction port at the lower end of the strainer 6 is suppressed from coming out above the oil level, and the strainer 6 does not suck air. As a result, the seizure of the engine due to the suction of air by the strainer 6, the increase in friction due to the interference between the fluctuating and elevated oil level and the rotating system components, the increase in bubbles in the oil,
Oil temperature rise, oil deterioration, etc. are suppressed.

Since it is not necessary to weld a baffle plate or the like in the lower oil pan 2 in order to suppress the inclination and rise of the oil level, no labor for welding is required, the cost and the mass can be reduced, and the baffle plate can be reduced. The problem of crack generation at the welded portion when the film vibration of the oil pan and the fluctuating load of oil act on the oil pan can also be avoided.

[0015]

According to the oil pan of the present invention, the left and right side walls of the upper oil pan are extended almost horizontally outward from the lower ends of the left and right side walls to form ceiling walls at the ends in the left and right direction inside the lower oil pan. The extension allows the oil level in the oil pan to be tilted and raised in the left and right directions when the vehicle turns left and right by the lower surface of the overhanging wall. It is possible to suppress an increase in friction, an increase in bubbles in oil, an increase in oil temperature, oil deterioration, and the like due to interference between the surface and the rotating system component. And since these suppressions are achieved without welding the baffle plate in the lower oil pan, there is no occurrence of cracks from the welded portion and propagation of the generated cracks to the oil pan.

[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 cross-sectional view of the oil pan of FIG. 1 taken along line AA.

FIG. 3 is a cross-sectional view of the oil pan of FIG. 2 taken along line BB.

[Explanation of symbols]

 Reference Signs List 1 upper oil pan 2 lower oil pan 6 oil strainer 8 oil level 8a, 8b, 8c inclined oil level 9 upper oil pan side wall 10 rib 11 overhanging wall 14a, 14a, 14a 15 bottom wall of upper oil pan 19 cylinder block 20 Opening 23 Inside of lower oil pan 23a, 23b Left and right end inside

Claims (1)

[Claims] 1. An upper oil pan having left, right, front and rear side walls and a bottom wall, and having at least one opening at a front portion of the bottom wall, wherein the at least one opening is coupled to a lower end of a front portion of the upper oil pan. A lower oil pan having an interior that communicates with the inside of the upper oil pan through the lower oil pan. An oil pan characterized by extending an overhanging wall serving as a ceiling wall at an end portion in a left-right direction.