JPS595784B2 - engine oil pan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine oil pan, and particularly to its noise reduction structure.

In general, an engine generates vibrations in response to its operation, and the engine vibrations are transmitted to an oil pan attached to the lower part of the engine by a tightening member, and are propagated to the outside as noise.

Among these noises, those caused by low frequency vibrations are particularly audible.

Conventionally, as in Utility Model Application No. 55-28778, a bead extending vertically is formed on the side surface of the oil pan, and this bead improves the rigidity of the oil pan and eliminates low frequency components, thereby reducing noise. Techniques have been proposed to reduce the occurrence of.

However, in the above proposed structure, a bead is formed in the entire area from the top to the bottom of the oil pan, and the relationship between the members and the arrangement of the bead is not considered when tightening the oil pan to attach and secure it to the engine. Therefore, while the noise caused by low frequency vibration pressure is reduced, the noise caused by high frequency vibration increases.

In other words, if a bead is also formed near the tightening member, the rigidity of this part will improve, so high frequency vibrations from the engine will be transmitted from the member to the bead with high rigidity tightening.
When the bead itself vibrates at high frequency, the surfaces connected on both sides of the bead vibrate greatly in the form of bead joints, and the noise due to the high frequency vibration increases.

In view of this, the present invention provides an oil pan for an engine in which the upper end of the bead is located between a plurality of tightening members, thereby reducing the noise of both low-frequency vibration and high-frequency vibration. It also reduces the

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

In the drawings, reference numeral 1 denotes an oil pan for storing lubricating oil, which is attached to the lower part of the engine E by a plurality of fastening members 2;
3 is a cylinder head of engine E, and 4 is a cylinder block.

The oil pan 1 has a flange-like tightening surface 1a at the upper end.
The member 2 is brought into contact with the lower end of the cylinder block 4 of the engine E, and the bolts are tightened by tightening the members 2 at predetermined intervals to be fixed to the lower part of the engine E.

The oil pan 1 has a plurality of groove-shaped beads 5 extending in the vertical direction formed in parallel on its side surface, and the upper end portion 5a of each bead 5 is provided so as to be located between each tightening member 2. It is being

That is, the upper end 5a of the bead 5 is provided at an equal distance from the member 2, and each clamp is provided at a predetermined height below the surface 1a. It is configured so that no bead 5 exists inside.

To explain the operation of the above embodiment, by forming the beads 5 in the vertical direction on the side surface, the rigidity of the entire oil pan 1 is improved and low frequency vibrations are eliminated, while the upper end portion of each bead 5
A is provided between each of the tightening members 2, so that the rigidity of the peripheral part of the member 2 is maintained low during tightening.
Its damping effect eliminates high frequency vibrations and makes the bead 5
The transmission of high frequency vibrations to is reduced.

Therefore, both noise caused by low frequency vibrations and noise caused by high frequency vibrations can be reduced or eliminated.

In addition, when forming the bead 5 described above, if the bead 5 is formed directly under the member 2, the length of the bead 5 in the vertical direction will be shortened, and the rigidity of the oil pan 1 will not be improved sufficiently.
Although low-frequency vibrations are not sufficiently eliminated, when the upper end 5a of the bead 5 is tightened closer to the member 2, high-frequency components are transmitted to the bead 5.

On the other hand, as in the present invention, the bead 5 is tightened by the member 2.
0, the distance between the upper end 5a of the bead 5 and the tightening member 2 can be increased, so that the upper end 5a of the bead 5 can be placed in an upward position, and the bead 5 is formed long to improve rigidity. By increasing the effect, the tightening can provide a sufficient low-frequency vibration reduction effect even if the damping effect around the member 2 is ensured.

Therefore, according to the present invention as described above, in forming a bead extending in the vertical direction on the side surface of the oil pan, the upper end of the bead is provided so as to be located between each of the plurality of fastening members. By forming a single bead, the rigidity of the entire oil pan is improved and low frequency vibrations are eliminated. At the same time, tightening makes it difficult for high frequency vibrations to be transmitted from the member to the bead and suppresses noise generation due to high frequency vibrations. Therefore, it is possible to effectively eliminate and reduce both low frequency components and high frequency components of noise caused by the transmission of engine vibrations, and has an excellent overall noise reduction effect.

[Brief explanation of the drawing]

The drawing is a schematic side view of an engine showing one embodiment of the present invention. E...Engine, 1...Oil pan,
2...Tightening member, 4...Cylinder block, 5...Bead.

Claims (1)

[Claims] 1. In an oil pan of an engine in which a plurality of fasteners are attached to the lower part of the engine and a bead extending in the vertical direction is formed on the side surface, the upper end of the bead is attached to each of the plurality of fasteners of the member. An engine oil pan characterized in that it is located between.