JP2009287436A - Oil pan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil pan capable of suppressing generation of radiation sound from a bottom surface wall of an oil pan. <P>SOLUTION: The oil pan 100 is a frame body equipped with a side surface wall 11 and the bottom surface wall 12, and is provided with a deep bottom part 15 storing engine oil and a shallow bottom part 16 making the engine oil flow into the deep bottom part 15. The bottom surface wall 12 is equipped with a plurality of expansion parts 12B extended along the longitudinal direction from the shallow bottom part 16 to the deep bottom part 15 and provided in plurality in the width direction orthogonal to the longitudinal direction, and having a width direction cross section expanded in a shape of an arc; and a protruding part 12C extended along the longitudinal direction and provided between the expansion parts 12B, having a width direction cross section in a shape of an arc with a curvature larger than a curvature of the expansion part 12B, and protruded to the opposite side from the expansion direction of the expansion part 12B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine oil pan.

  2. Description of the Related Art Conventionally, an oil pan is known that is disposed under a cylinder block of an engine and temporarily stores engine oil (for example, Patent Document 1). When the oil pan is vibrated by vibrations from the engine body, the oil pan wall surface vibrates and radiated sound is generated from the oil pan wall surface. This radiated sound becomes noise and deteriorates the ride comfort of the vehicle.

The oil pan of Patent Document 1 forms an arcuate curved surface on the side wall of the oil pan, thereby suppressing membrane vibration of the side wall of the oil pan and suppressing the generation of radiated sound.
JP-A-61-252856

  However, in the oil pan described in Patent Document 1, the bottom wall of the oil pan that is most susceptible to membrane vibration due to vibration from the engine body is not taken into consideration, and the generation of radiated sound from the bottom wall of the oil pan cannot be reduced. There is.

  Then, this invention is made | formed in view of an above-described problem, and it aims at providing the oil pan which can suppress generation | occurrence | production of the radiation sound from an oil pan bottom wall.

  The present invention solves the above problems by the following means.

  In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected, it is not limited to this.

  The present invention is a frame having a side wall (11) and a bottom wall (12), a deep bottom portion (15) for storing engine oil, and a shallow bottom portion (16) for flowing engine oil to the deep bottom portion (15). In the oil pan (100) having a plurality of bottom walls (12) extending along the longitudinal direction from the shallow bottom (16) to the deep bottom (15) and extending in the width direction perpendicular to the longitudinal direction. Provided between the bulging portion (12B) having a widthwise section that bulges in an arc shape and extending along the longitudinal direction and between the bulging portions (12B). It has an arc shape with a larger curvature than the curvature of the portion (12B), and has a protruding portion (12C) protruding to the opposite side to the bulging direction of the bulging portion (12B).

  According to the present invention, the bulging portion and the protruding portion are formed on the bottom wall of the oil pan to increase the rigidity of the bottom wall. The projecting portion having a large curvature extends along the oil pan longitudinal direction and functions as a rib on the bottom wall, thereby further increasing the rigidity of the bottom wall. Thereby, the membrane vibration of the bottom wall can be suppressed, and the sound pressure level of the radiated sound caused by the vibration can be reduced. In addition, since the rigidity of the bottom wall is enhanced with a compact configuration, an increase in oil pan weight and deterioration in layout can be suppressed as much as possible even if a bulge or a protrusion is formed on the bottom wall.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic configuration diagram of an oil pan 100.

  The engine is mounted on the vehicle such that the crankshaft extends in the vehicle front-rear direction. The oil pan 100 is disposed below the cylinder block of the engine, and temporarily stores engine oil that circulates inside the engine. The oil pan 100 includes an upper oil pan 10 and a lower oil pan 20. The upper oil pan 10 is disposed below the cylinder block, and the lower oil pan 20 is disposed below the upper oil pan 10.

  In the present embodiment, the oil pan 100 is divided. However, the upper oil pan 10 and the lower oil pan 20 may be integrally formed.

  Details of the upper oil pan 10 will be described with reference to FIGS. 2 (A) to 2 (C).

  FIG. 2A is a plan view of the upper oil pan 10. FIG. 2B is a cross-sectional view in the width direction of the upper oil pan 10 at the BB position in FIG. FIG. 2C is a longitudinal sectional view of the upper oil pan 10 at the CC position in FIG.

  As shown in FIG. 2A, the upper oil pan 10 is configured as a substantially box-shaped frame body including a side wall 11 and a bottom wall 12. The upper oil pan 10 opens upward, and is fixed to the lower side of the cylinder block via a flange 13 formed on the upper surface of the side wall 11. The upper oil pan 10 is formed with an opening 12A in a part of the bottom wall 12 so as to open downward, and the lower oil pan 20 is disposed so as to cover the opening 12A.

  As shown in FIG. 2C, the upper oil pan 10 has a deep bottom portion 15 that stores engine oil and a shallow bottom portion 16 that is relatively shallower than the deep bottom portion 15.

  The deep bottom portion 15 is located on the vehicle front side with respect to the shallow bottom portion 16. The deep bottom portion 15 stores engine oil in a state where the lower oil pan 20 is installed.

The shallow bottom portion 16 is located on the vehicle rear side and allows engine oil to flow toward the deep bottom portion 15. Accordingly, the bottom wall 12 that defines the shallow bottom portion 16 is inclined so that the engine oil in the shallow bottom portion 16 flows smoothly toward the deep bottom portion 15 so that the bottom wall 12 is inclined downward toward the deep bottom portion 15 in the longitudinal direction. The inclined surfaces 12A _{1 to} 12A ₄ having different diameters are formed.

  Further, as shown in FIG. 2B, the bottom wall 12 includes a bulging portion 12B that bulges in an arc shape toward the outside of the oil pan, and a protruding portion 12C that protrudes on the arc toward the inside of the oil pan. Have

Swollen portion 12B is formed as a part of an arc of a circle C ₁ indicated by a broken line. Three bulging portions 12B are provided across the width direction. These bulging portions 12B extend in parallel along the longitudinal direction. The center in the width direction of the bulging portion 12B disposed at the center of the three bulging portions 12B is set on a line D passing through the center in the width direction between the side walls 11 in the vertical direction.

Protrusion 12C is formed as a part of an arc of a circle C ₂ indicated by a broken line. 12 C of protrusion parts are provided between the bulging parts 12B, and two are formed in the width direction. These protrusions 12C extend in parallel along the longitudinal direction.

  The curvatures of the three bulging portions 12B are set to be equal, and the curvatures of the two protruding portions 12C are set to be equal. However, the curvature of the bulging portion 12B is set to be smaller than half the curvature of the protruding portion 12C.

  In the oil pan 100, the plurality of bulging portions 12B are formed on the bottom wall 12 of the upper oil pan 10, and the protruding portions 12C are formed between the bulging portions 12B, thereby increasing the rigidity of the bottom wall 12. As a method for increasing the rigidity of the bottom wall of the upper oil pan, it is conceivable to form a rib 212A on the bottom wall 212 of the upper oil pan 210 of the oil pan 200 as shown in FIG. This oil pan 200 is for comparison with the oil pan 100 of the present embodiment shown in FIG.

  As shown in FIG. 3A, in the oil pan 200, the rib 212A is formed on the flat bottom wall 212 along the longitudinal direction to improve the second moment of section, thereby increasing the rigidity of the bottom wall 212. However, when the sectional moment of inertia is improved in this way, the width W, height H, etc. of the rib 212A are increased, the rib shape is enlarged, the oil pan weight is increased, and the layout is deteriorated. To do.

  On the other hand, in the oil pan 100 of the present embodiment, as shown in FIG. 3B, the bulging portion 12B and the protruding portion 12C are formed on the bottom wall 12 and the entire bottom wall 12 is used to form the bottom surface. The rigidity of the wall 12 is ensured. Therefore, the oil pan 100 can increase rigidity with a compact configuration as compared with the oil pan 200 that forms the rib 212A separately from the bottom wall 212, and suppresses an increase in the weight of the oil pan and a deterioration in layout performance. Can do.

  As described above, since the oil pan 100 increases the rigidity of the bottom wall 12 of the upper oil pan 10, membrane vibration of the bottom wall 12 can be suppressed, and the sound pressure level of sound radiated from the bottom wall 12 can be reduced.

  FIG. 4A to FIG. 4C are diagrams for explaining the effect of reducing the sound pressure level of the radiated sound.

  As shown at a position A in FIG. 4A, the center of the bottom wall 12 that easily vibrates when the engine body vibrates is set as the excitation position. The vibration level of the bottom wall 12 of the upper oil pan 10 and the sound pressure level of the radiated sound from the bottom wall 12 at the vibration position A will be described.

  FIG. 4B is a diagram showing the relationship between the frequency and the vibration level of the bottom wall 12. FIG. 4C is a diagram showing the relationship between the frequency and the sound pressure level of sound radiated from the bottom wall 12. 4 (B) and 4 (C), the solid line shows the oil pan 100 of the present embodiment, and the broken line shows the oil pan as a comparative example having a flat bottom wall not provided with the bulging part and the protruding part. Show.

  In the upper oil pan 10 of the oil pan 100, the bulging portion 12B and the protruding portion 12C are provided on the bottom wall 12 to increase the rigidity of the bottom wall 12. Therefore, as indicated by the hatched area P in FIG. The vibration level is lower than the dashed vibration level at most frequencies.

  For this reason, as shown in FIG. 4C, the sound pressure level of the solid line is lower than the sound pressure level of the broken line in many frequency bands. Further, the sound pressure level indicated by the solid line also decreases in the frequency band where the maximum sound pressure level indicated by the broken line is shown as indicated by the broken line region Q in FIG. Therefore, in the upper oil pan 10 in which the bulging portion 12B and the protruding portion 12C are formed on the bottom wall 12, the generation of radiated sound from the bottom wall 12 is suppressed.

  As described above, in the oil pan 100 of the first embodiment, the following effects can be obtained.

  In the oil pan 100, the bottom wall 12 of the upper oil pan 10 is formed in an arcuate shape with a small bulge portion 12B having a small curvature and a projection portion 12C having a large curvature, thereby increasing the rigidity of the bottom wall 12. The projecting portion 12 </ b> C having a large curvature extends along the longitudinal direction of the oil pan and functions as a rib in the bottom wall 12, thereby further increasing the rigidity of the bottom wall 12. Thereby, the membrane vibration of the bottom wall 12 can be suppressed, and the sound pressure level of the radiated sound generated due to the vibration can be reduced. Thus, since the oil pan 100 can increase rigidity with a compact configuration, even if the bulging portion 12B and the protruding portion 12C are formed on the bottom wall 12, the oil pan weight can be increased and the layout can be deteriorated. It can be suppressed as much as possible.

  Further, in the oil pan 100, the bulged portion 12B having a small curvature is formed so as to bulge outside the oil pan, and the projecting portion 12C having a large curvature is formed so as to project inside the oil pan. It can be secured sufficiently.

Furthermore, in the oil pan 100, a plurality of inclined surfaces 12 </ b> A _{1 to} 12 </ b> A ₄ are formed on the bottom wall 12 of the upper oil pan 10 so as to descend downward from the shallow bottom portion 16 toward the deep bottom portion 15. Thus, the rigidity of the bottom wall 12 can be further increased by arranging the inclined surfaces 12A _{1 to} 12A ₄ having different inclination angles in the longitudinal direction of the upper oil pan.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  In this embodiment, the bulging portion 12B and the protruding portion 12C are formed on the bottom wall 12 of the upper oil pan 10, but the bulging portion and the protruding portion may also be formed on the bottom wall of the lower oil pan 20. .

  In the present embodiment, three arcuate bulging portions 12B are formed in the width direction on the bottom wall 12 of the upper oil pan 10, but in consideration of layout and the like, FIG. As shown in C), the bulging portion 12B may be formed.

In the oil pan 100, forms a bulge portion 12B as a part of an arc of a circle C ₁ (see FIG. 2 (B)), as shown in FIG. 5 (A), as a part of the curve of the ellipse C ₃ The bulging portion 12B may be formed so that the curvature changes continuously. Further, in the oil pan 100, the curvatures of the three bulging portions 12B are set to be the same. However, as shown in FIG. 5B, the curvature of the bulging portion 12B arranged at the center in the width direction is set on both sides. You may make it set smaller than the curvature of the two bulging parts 12B arrange | positioned. Further, in the oil pan 100, the three bulging portions 12B are formed in the width direction. However, as shown in FIG. 5C, the four bulging portions 12B are formed in the width direction, and the bulging portions 12B are formed. The curvature may be set to be different.

  Even if the bulging portion 12B of the bottom wall 12 is formed as shown in FIGS. 5A to 5C, the rigidity of the bottom wall 12 can be increased as in the present embodiment.

In the present embodiment, a plurality of inclined surfaces 12A _{1 to} 12A ₄ are formed on the bottom wall 12 of the upper oil pan 10 so as to descend from the shallow bottom portion 16 toward the deep bottom portion 15. However, as shown in FIG. It is configured to have an inclined surface 12A ₂ inclined from the flat surface 12A ₁ toward the deep bottom portion 15, or the inclined surface 12A is curved as shown in FIG. 6B, and the inclined angle of the inclined surface 12A is continuous. Or may be configured to change.

  Even if the inclined surface 12A of the bottom wall 12 is formed as shown in FIGS. 6A and 6B, the rigidity of the bottom wall 12 can be increased as in the present embodiment.

It is a schematic block diagram of an oil pan. It is a schematic block diagram of an upper oil pan. It is a figure explaining the method to raise the rigidity of the bottom face wall of an upper oil pan. It is a figure explaining the sound pressure level reduction effect of the radiated sound which generate | occur | produces from the bottom wall of an upper oil pan. It is a figure explaining the variation of the bulging part formed in the bottom face wall of an upper oil pan. It is a figure explaining the variation of the inclined surface formed in the bottom face wall of an upper oil pan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Oil pan 10 Upper oil pan 20 Lower oil pan 11 Side wall 12 Bottom wall 12A Inclined surface 12B Swelling part 12C Projection part 15 Deep bottom part 16 Shallow bottom part

Claims (5)

In an oil pan having a side wall and a bottom wall, the oil pan having a deep bottom portion for storing engine oil and a shallow bottom portion for flowing engine oil to the deep bottom portion,
The bottom wall is
A plurality of bulging portions that extend along the longitudinal direction from the shallow bottom portion toward the deep bottom portion and that extend in the width direction orthogonal to the longitudinal direction, and whose cross section in the width direction bulges in an arc shape;
Extending along the longitudinal direction and provided between the bulging portions, the cross section in the width direction is an arc shape having a curvature larger than the curvature of the bulging portion, and the bulging direction of the bulging portion Is a protruding part protruding to the opposite side,
An oil pan comprising: The bulging portion is formed so as to bulge outside the oil pan,
The protrusion is formed to protrude inside the oil pan.
The oil pan according to claim 1. The center in the width direction of one bulge portion among the plurality of bulge portions formed is set on a line passing through the width direction center between the side walls in the vertical direction.
The oil pan according to claim 1 or 2, characterized in that. The curvature of the bulging portion is set to be smaller than half of the curvature of the protruding portion,
The oil pan according to any one of claims 1 to 3, wherein the oil pan is provided. The bottom wall is formed with a plurality of inclined surfaces having different inclination angles so as to be inclined downward from the shallow bottom portion toward the deep bottom portion.
The oil pan according to any one of claims 1 to 4, wherein the oil pan is provided.

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