JP2004278446A - Oil pan cover for vehicle engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress vibration in the part of a fitting flange of an oil pan and to effectively prevent noise leakage from the part and the generation of standing waves. <P>SOLUTION: An oil pan cover is equipped with a rigid cover body 22 that has an inner face form corresponding to an outer face form of the oil pan 16 around which the fitting flange 16a is fitted with a male screw 17 for avoidance in a lower part of a cylinder block 10a, and a foaming body 23 that is formed on the inner face of the cover body 22 facing the oil pan 16 so as to cover the outer face of the oil pan 16. A facing flange 22a facing the fitting flange 16a is formed around the cover body 22. A recess 23a capable of accommodating a head 17a of the male screw 17 is formed at the foaming body 23 formed on the inner face of the facing flange 22a, and the foaming body 23 accommodating the head 17a of the male screw 17 in the recess 23a is closely contacted with the fitting flange 16a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil pan cover that covers an oil pan provided at a lower portion of a vehicle engine, suppresses vibration of the oil pan and absorbs noise, thereby reducing noise leaking outside or into a vehicle compartment.
[0002]
[Prior art]
An engine used in a vehicle is provided with an oil pan that closes a lower portion of a cylinder block. This oil pan is likely to vibrate due to rotation of a crankshaft inside the engine or the like, and there is a problem that noise generated inside the engine leaks out of the vehicle or into the vehicle compartment.
In order to solve this problem, the oil pan is conventionally covered with an oil pan cover. A conventional oil pan cover includes a rigid cover body having an inner surface shape corresponding to the outer shape of the oil pan, and a foam formed integrally with the cover body on an inner surface of the cover body facing the oil pan. Prepare. In this oil pan cover, while the oil pan is covered, the foam adheres to the oil pan and suppresses the vibration of the oil pan together with the cover body to reduce noise, and the foam leaks from the oil pan together with the cover body. (See, for example, Patent Document 1).
On the other hand, since the mounting flange of the conventional oil pan is attached to the lower portion of the cylinder block by a male screw, the head of the male screw projects from the surrounding mounting flange of the oil pan. For this reason, the conventional oil pan cover does not have a portion facing the mounting flange from which the head of the male screw projects, or covers the mounting flange with a predetermined gap.
[0003]
[Patent Document 1]
JP-A-2002-206411
[Problems to be solved by the invention]
However, in the conventional oil pan cover, since the foam does not cover the mounting flange of the oil pan from which the head of the male screw protrudes, vibration in that part cannot be suppressed. There was a problem that the noise in the room could not be reduced sufficiently. In addition, there was a problem that a standing wave was generated due to a gap between the mounting flange of the oil pan and the foam of the oil pan cover. In order to solve this problem, it is conceivable that the foam formed on the oil pan cover is pressed against the mounting flange of the oil pan to cover all of the mounting flange. However, when the foam is pressed against the mounting flange, the foam that interferes with the head of the external thread projecting from the mounting flange is crushed and deformed, and the foam protrudes from the periphery of the cover body and deteriorates the appearance. However, there is also a problem that the protruding foam interferes with other members.
SUMMARY OF THE INVENTION It is an object of the present invention to provide an oil pan cover for a vehicle engine that can suppress vibration at a portion of a mounting flange of an oil pan and effectively prevent noise leakage and standing waves from the portion. It is in.
[0005]
[Means for Solving the Problems]
As shown in FIG. 1, the invention according to claim 1 has a rigid cover having an inner surface shape corresponding to the outer surface shape of an oil pan 16 in which a peripheral mounting flange 16a is attached to a lower portion of a cylinder block 10a by a male screw 17. This is an improvement in an oil pan cover including a main body 22 and a foam body 23 formed on an inner surface of the cover main body 22 facing the oil pan 16 so as to cover an outer surface of the oil pan 16.
The characteristic configuration is such that a concave portion 23a is formed around the cover main body 22 so that a facing flange 22a facing the mounting flange 16a is formed, and a foam 23 formed on the inner surface of the facing flange 22a can accommodate the head 17a of the male screw 17. Is formed, and the foam 23 containing the male screw head 17a in the concave portion 23a is configured to be in close contact with the mounting flange 16a.
[0006]
According to the first aspect of the present invention, when the oil pan cover 21 is covered with the oil pan 16, the foam 23 adheres to the oil pan 16 and suppresses the vibration of the oil pan 16 together with the cover main body 22 to reduce noise. The foam 23 absorbs noise leaked from the oil pan 16 together with the cover main body 22 to reduce noise leaking outside the vehicle or into the vehicle compartment. The foam 23 formed on the opposed flange 22a around the cover main body 22 is in close contact with the mounting flange 16a of the oil pan 16 to prevent noise leakage and standing waves from that portion. On the other hand, the head 23a of the male screw 17 for attaching the mounting flange 16a to the cylinder block 10a is accommodated in the concave portion 23a formed in the foam 23 on the inner surface of the opposed flange 22a, and the foam 23 is pushed by the head 17a of the male screw 17. Smashing is avoided.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 3 shows an engine 10 used in a vehicle. The engine 10 is mounted on a front portion of a chassis frame 11 via an engine mount bracket 12, and the engine mount bracket 12 is mounted on the chassis frame 11 by an independent vibration system. The engine 10 is provided with an oil pan 16 covering a lower portion of a cylinder block 10a covered by an oil pan cover 21.
[0008]
As shown in FIGS. 1 and 2, the oil pan 16 is formed of a relatively thin plate material by sheet metal processing or the like, and a mounting flange 16a corresponding to the periphery of the cylinder block 10a is integrally formed therearound. A plurality of female screws 10b are formed around the cylinder block 10a corresponding to the mounting flange 16a, and a mounting hole 16b is formed in the mounting flange 16a corresponding to the female screw 10b. A male screw 17 is inserted into the mounting hole 16b from below, and is screwed into a female screw 10b formed in the cylinder block 10a, whereby the oil pan 16 is mounted on a lower portion of the cylinder block 10a.
[0009]
On the other hand, the oil pan cover 21 that covers the oil pan 16 has a rigid cover body 22 having an inner surface shape corresponding to the outer surface shape of the oil pan 16, and an oil pan cover 22 on the inner surface of the cover body 22 facing the oil pan 16. And a foam 23 formed so as to cover the outer surface of the fuel cell 16. The cover main body 22 in this embodiment is made by press-molding polypropylene reinforced with glass fiber, and the cover main body 22 is placed in a molding die to foam a foam material inside the die. Thereby, the foam 23 is formed integrally with the cover body 22. Examples of the foam 23 include urethane foam and foam rubber.
[0010]
An opposing flange 22a facing the mounting flange 16a of the oil pan 16 is integrally formed around the cover main body 22 when the polypropylene is press-molded. The inner surface of the opposing flange 22a also covers the outer surface of the mounting flange 16a. The foam 23 is formed. On the other hand, in the foam 23 formed on the inner surface of the opposed flange 22a, a concave portion 23a capable of accommodating the head 17a of the male screw 17 protruding from the mounting flange 16a is formed. The concave portion 23a shown in the figure is a concave groove formed in the opposed flange 22a so as to extend in the width direction in the foam body 23. The concave portion 23a formed by the concave groove is formed when the foam material is foamed inside the mold.
[0011]
Returning to FIG. 3, a mounting bracket 24 for mounting the oil pan cover 21 to the cylinder block 10a is provided on the outer surface of the cover main body 22 of the oil pan cover 21 thus configured. A receiving bracket 26 is provided on a portion of the cylinder block 10a facing the mounting bracket 24, and the mounting bracket 24 and the receiving bracket 26 are fastened by screw means 27, so that the oil pan cover 21 covers the oil pan 16 in a state where the oil pan 16 is covered. It is attached to the cylinder block 10a. When the oil pan 16 is covered with the oil pan cover 21, the head 17a of the male screw 17 enters and is accommodated in the recess 23a of the foam 23 formed on the opposed flange 22a. It is configured to be in close contact with the mounting flange 16a around the pan.
[0012]
When the oil pan cover 21 is put on the oil pan 16 provided at the lower part of the vehicle engine 10 in this manner, the foam 23 is brought into close contact with the oil pan 16 while the oil pan cover 21 is covered with the oil pan 16. The vibration of the oil pan 16 is suppressed together with the cover body 22 to reduce noise. Further, the foam 23 absorbs noise leaked from the oil pan 16 together with the cover main body 22 to reduce noise leaked outside the vehicle or into the vehicle compartment. Here, the foam 23 formed on the opposing flange 22a around the cover main body 22 is in close contact with the mounting flange 16a of the oil pan 16 to prevent a gap from being generated at that portion. As a result, leakage of noise and generation of standing waves from this portion are prevented, and noise outside the vehicle and in the vehicle compartment can be sufficiently reduced.
[0013]
On the other hand, the recess 23a is formed in the foam 23 formed on the inner surface of the opposed flange 22a, and the head 17a of the male screw 17 for attaching the mounting flange 16a to the cylinder block 10a is accommodated in the recess 23a. Even when the foam 23 is brought into close contact with the mounting flange 16 a of the oil pan 16, the foam 23 is not crushed by the head 17 a of the male screw 17, and the foam 23 is deformed and protrudes from the periphery of the cover body 22. Is avoided. For this reason, the appearance in that part is maintained, and the protruding foam 23 can be prevented from interfering with other members.
In the above-described embodiment, the cover main body 22 made by press-molding polypropylene reinforced with glass fiber is used, but the cover main body 22 is made by pressing a metal plate material. It may be something.
Further, in the above-described embodiment, the concave portion 23a formed of a concave groove has been described. However, as shown in FIG. 4, the concave portion 23a may be a concave hole capable of accommodating the head of the male screw.
[0014]
【The invention's effect】
As described above, according to the present invention, an opposing flange is formed around the cover body of the oil pan cover so as to face the mounting flange around the oil pan, and the oil pan is formed on the foam formed on the inner surface of the opposing flange. A recess that can accommodate the head of the external thread to be attached is formed, and the foam that accommodates the head of the external thread in the recess is configured to be in close contact with the mounting flange. Closely attached to the oil pan, the vibration of the oil pan is suppressed together with the cover body to reduce the noise, and the foam reduces the noise leaked from the oil pan together with the cover body to reduce the noise leaking outside and inside the vehicle compartment. it can. The foam formed on the opposed flange around the cover main body is in close contact with the mounting flange of the oil pan, and effectively prevents noise leakage and standing waves from being generated from that portion. On the other hand, the recess formed in the foam on the inner surface of the opposing flange accommodates the head of a male screw for attaching the mounting flange to the cylinder block, so that the foam can be prevented from being crushed by the head of the male screw.
[Brief description of the drawings]
FIG. 1 is a sectional view taken along line AA of FIG. 3 showing an oil pan cover of the present invention.
FIG. 2 is a perspective view showing the oil pan cover.
FIG. 3 is a front view showing an attached state of the engine having the oil pan cover.
FIG. 4 is a perspective view showing another oil pan cover of the present invention.
[Explanation of symbols]
10a Cylinder block 16 Oil pan 16a Mounting flange 17 Male screw 17a Head 21 Oil pan cover 22 Cover body 22a Opposing flange 23 Foam 23a Recess

Claims (1)

A rigid cover body (22) having an inner surface shape corresponding to the outer surface shape of an oil pan (16) having a peripheral mounting flange (16a) attached to a lower portion of a cylinder block (10a) by a male screw (17); An oil pan cover comprising: a foam body (23) formed on an inner surface of the cover body (22) facing the oil pan (16) so as to cover an outer surface of the oil pan (16);
A facing flange (22a) facing the mounting flange (16a) is formed around the cover body (22),
A recess (23a) capable of accommodating the head (17a) of the male screw (17) is formed in the foam (23) formed on the inner surface of the opposed flange (22a),
An oil pan cover for a vehicle engine, wherein the foam (23) containing the head portion (17a) of the male screw in the recess (23a) is in close contact with the mounting flange (16a). .

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