JPH07279756A - Noise shut out structure for oil pan - Google Patents

Abstract

PURPOSE:To simplify structure, and improve workability by arranging a cover above an oil pan at a prescribed interval, fixing the cover to the oil pan at their lower parts, and also interposing a seal member between the circumferential rim of the cover and the outer wall surface of the oil pan. CONSTITUTION:An oil pan 13 is fixed to the lower surface circumferential rim part 12 of a cylinder block 11 by using a plurality of bolts 18, and a cover 14 is provided above the outer side of the oil pan 13 at a prescribed interval. A plurality of bolt penetrating holes are drilled on the bottom plate of the oil pan 13, and also weld nuts 15 are fixed on the part on the oil pan 13 inner side at its drilling positions. The cover 14 is fixed by screwing a plurality of bolts 19 which are inserted from the bottom surface of the cover 14 in the weld nuts 15, in such a condition that an insulator seal member 16 is interposed between the bottom surface 14a of the cover 14 and the bottom surface 13b of the oil pan 13. A seal member 17 is interposed between the upper part circumferential surface 13c of the oil pan 13 and the opening part inner circumferential surface of the cover 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan soundproof structure in which an engine oil pan is covered with a sound insulating cover.

[0002]

2. Description of the Related Art Generally, an oil pan of an engine is attached to a lower end surface of a cylinder body through a gasket. Vibration of the body is transmitted to the oil pan to generate a large noise, which is a main noise source of the engine. It is one.

Therefore, conventionally, it has been proposed to cover the outer circumference of the oil pan with a sound insulating cover to prevent the generation of noise, and a conventional example of the sound insulating structure is shown in FIGS. 7 and 8.

In FIG. 7, reference numeral 1 denotes a cylinder block of an engine, a flange 2 is provided so as to project on a lower outer peripheral portion of the cylinder block 1, and an inner surface 2a of the lower surface of the flange 2 is provided. The oil pan 3 is supported by bolts 8. Outside 2 of the bottom surface of the flange 2
An oil pan cover (hereinafter referred to as a cover) 4 is supported by a bolt 9 at b via a seal member 6, 7 formed of an elastic material so as to maintain an appropriate gap outside the oil pan 3. .

In FIG. 8 showing another conventional example, an oil pan 3 is fixed to a lower lower surface of a cylinder block 1 by a plurality of bolts 8. Outside the oil pan 3, there are provided covers 4a and 4b which are divided into two at the center in the longitudinal direction of the cylinder block 1 with an appropriate gap from the oil pan 3 and are provided at the center of the oil covers 4a and 4b. Flanges 4c and 4d are formed on the mating surfaces, and the flanges 4c and 4d are opposed to each other, and the seal member 6 is interposed therebetween.
The bolts 8a are screwed into the nuts 8b with the bolts interposed. A seal member 7 is interposed between the upper inner surfaces of the oil covers 4a and 4b and the upper outer surface of the oil pan 3 (1992 Utility Model Application Publication No. 47377).

[0006]

In the case of the structure of FIG. 7, since the flange 2 for supporting the oil pan 3 and the cover 4 is provided on the outer peripheral portion of the lower portion of the cylinder block 1 of the engine, the portion of the flange 2 is Cylinder block 1
Of the cylinder block 1 becomes bulky, the degree of freedom when the engine is mounted on the vehicle is reduced, and the flange 2 is fastened with the oil pan 3 and the cover 4 together with the bolts 8 and 9. Therefore, the structure is complicated. Not only that, but the workability is poor. Further, in the structure of FIG. 8, since the bolt tightening flanges 4c and 4d of the oil covers 4a and 4b divided into two project in the road surface direction, there is a problem that the load clearance is limited.

[0007]

According to a first aspect of the present invention, there is provided a cover which covers the entire oil pan of the engine and is arranged at a predetermined distance from the oil pan, and the cover and the oil. And a first seal member interposed between a peripheral edge of the cover and an outer wall surface of the oil pan, the fixing means fixing the pan between the lower surface of the oil pan and the lower surface of the cover. The sound insulation structure of the characteristic oil pan.

The invention according to claim 2 is characterized in that the cover comprises a first cover portion covering at least the drain plug portion and a second cover portion covering the other portion. It has a sound insulation structure for bread.

According to a third aspect of the present invention, the first cover portion is provided,
The sound insulation structure for an oil pan according to claim 2, wherein a second seal member is interposed between the second cover portion and the second cover portion.

A fourth aspect of the present invention is the sound-insulating structure for an oil pan according to the third aspect, wherein the second seal member has a contact portion that bulges toward the oil pan.

[0011]

In the invention of claim 1, the cover is fixed to the outside of the oil pan by the first seal member and the fixing means for fixing the cover between the lower surface of the oil pan and the lower surface of the cover. The cover is fixed without providing a flange and a bolt for holding the cover on the outside of the cover.

According to the second aspect of the present invention, since the cover is composed of the first cover portion that covers at least the drain plug portion and the second cover portion that covers the other portions, the oil pan is covered by the two-divided cover. .

In the invention of claim 3, since the second seal member is interposed between the first cover portion and the second cover portion, the opening of the first cover portion and the opening of the second cover are formed. The part is sealed with the second seal member.

According to the fourth aspect of the present invention, since the second seal member has the contact portion that bulges toward the oil pan side, the lower surface of the oil pan and the cover are also sealed by the second seal member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 4, reference numeral 11 indicates a cylinder block. An oil pan 13 is fixed to the lower surface peripheral portion 12 of the cylinder block 11 by a plurality of bolts 18 in a state where the peripheral portion 13a is in contact with the oil pan 13. Oil pan 1
A cover 14 is provided on the outer side of 3 with a predetermined gap.

As shown in FIGS. 1, 3 and 4, the bottom plate 13e of the oil pan 13 is provided with holes 13d through which bolts pass, at a plurality of positions. Inside the oil pan 13, the holes 13d are formed. A weld nut 15 is fixed to the holed portion. A plurality of bolts 19 are inserted between the lower surface 14a of the cover 14 and the lower surface 13b of the oil pan 13 with the insulator seal member 16 interposed therebetween.
It is screwed to. Reference numeral 110 indicates a drain plug.

As shown in FIG. 2, a first seal member 17 is provided between the upper peripheral surface 13c of the oil pan 13 and the inner peripheral surface 14c of the opening of the cover 14. Cover 14
Is supported by the first seal member 17 and the bolt 19 outside the oil pan 13 with a predetermined gap. The first seal member 17 is composed of an insulator as a vibration isolator. Reference numeral 20 indicates a bolt for fixing the support bearing of the crankshaft.

In the above embodiment, the weld nut is provided inside the oil pan, and the cover is supported and fixed to the outside of the oil pan. However, as shown in FIG.
The weld nut 15 is provided on the lower surface 13b of the bolt 1 and the bolt 1 is attached to the weld nut 15 via the seal member 16.
The cover 14 may be fixed by screwing 9 together. In this example, since the weld nut is provided on the outer side of the oil pan 13, the structure is simple and the manufacturing is easy.

Another embodiment of the present invention will be described with reference to FIG. In FIG. 6, only the characteristic parts of this embodiment are shown.
The same members as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

On the outside of the oil pan 13, two covers 24 and 34 are provided. One cover 24
Covers the drain plug 110 side of the oil pan 13, and the other cover 34 covers the side of the oil pan 13 where the drain plug 110 is not provided.
Opening 24b of cover 24 and opening 34b of cover 34
Overlap each other outside the oil pan 13. A second seal member 41 is provided in the overlapping portion. The inner side 41 a of the second seal member 41 bulges toward the oil pan 13 side, and the lower surface 13 of the oil pan 13
It is in contact with b. The cover 24 and the cover 34 are the second
Since the seal members 41 are overlapped with each other and fixed to the outside of the oil pan 13, the airtightness between the cover 24 and the cover 34 is maintained.

The cover 24 and the cover 34 are fixed by screwing bolts 29 and 39 onto the lower surface 13b of the oil pan 13. The fixing structure is the fixing structure of the bolt 19 of the embodiment shown in FIG. Since it is the same as the above, its explanation is omitted.

In addition, the upper opening 24a of the cover 24,
The upper opening 34a of the cover 34 is supported on the outside of the oil pan 13 with the first seal member interposed therebetween, and the supporting structure thereof is the oil pan 13 of the embodiment shown in FIG. The structure is the same as the support structure in which the cover 13 is supported with the first seal member 17 interposed between the upper peripheral surface 13c and the inner peripheral surface 14c of the opening of the cover 14, and therefore description thereof will be omitted.

In the above embodiment, the cover 24 is placed on the outside of the cover 34, but the cover 34 may be placed on the opposite side of the cover 24.

[0025]

According to the first aspect of the present invention, the cover is held without providing a flange for holding the cover on the outside of the cylinder block. Therefore, the cylinder block does not become bulky and the degree of freedom when the engine is mounted on the vehicle is reduced. Since the cover is held by the first seal member and the bolt while increasing
The structure is simple, the number of parts is small, the attachment / detachment is easy, and the workability is improved.

According to the second aspect of the invention, the oil pan is covered with the cover composed of the first cover part covering the drain plug part and the second cover part covering the other part, so that the workability of oil exchange is improved. In addition, the limit of road clearance will be removed.

According to the third aspect of the invention, the space between the opening of the first cover and the opening of the second cover is sealed by the second sealing member, so that the vibration-proof airtightness is improved.

According to the fourth aspect of the invention, the second seal member also seals between the lower surface of the oil pan and the cover, so that the first cover and the second cover are held in a stable state.

[Brief description of drawings]

FIG. 1 is a side view of an oil pan showing an embodiment of the present invention.

FIG. 2 is an enlarged partial sectional view of a portion C in FIG.

FIG. 3 is an enlarged partial cross-sectional view of portion B of FIG.

FIG. 4 is a vertical sectional view taken along the line AA of FIG.

FIG. 5 is a partial vertical cross-sectional view showing another example of the fixing means.

FIG. 6 is a partially cutaway side view of an oil pan showing another embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing an example of a sound insulating structure of a conventional oil pan.

FIG. 8 is a partially cut front view showing another example of the conventional sound insulation structure for an oil pan.

[Explanation of symbols]

 13 oil pan 13b lower surface of oil pan 14, 24, 34 cover 17 first seal member 19, 29, 39 bolt 41 second seal member

Claims (4)

[Claims] Claim: What is claimed is: 1. A cover which covers the entire oil pan of the engine and is arranged at a predetermined distance from the oil pan; and the cover and the oil pan, the lower surface of the oil pan and the cover. A sound insulation structure for an oil pan, comprising a fixing means for fixing the lower surface and a lower surface, and a first seal member interposed between the peripheral edge of the cover and the outer wall surface of the oil pan. 2. The sound insulation structure for an oil pan according to claim 1, wherein the cover comprises a first cover portion that covers at least the drain plug portion and a second cover portion that covers the other portions. 3. The sound insulating structure for an oil pan according to claim 2, wherein a second seal member is interposed between the first cover portion and the second cover portion. 4. The second seal member has an abutment portion that is bulged toward the oil pan.
Sound insulation structure of oil pan described in.