JPH10274093A - engine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the assemblability of an engine and to improve the sealing performance of the engine. SOLUTION: An elastic member 44 is adhered to an oil pan 14 and a mounting member (plate 42) is adhered to the elastic member so that a fastening member (bolt 46) penetrates the oil pan in a non-contact state. A hole 31) is formed, the fastening member is inserted into the through cutout, the mounting member is fixed to the cylinder block by the fastening member, and the oil pan is connected to the cylinder block side with a connecting member (cylinder cover 12). It was supported so that it could be isolated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine constituted by connecting a cylinder block and an oil pan.

[0002]

2. Description of the Related Art Conventionally, an oil pan is supported by being directly connected to an engine body using bolts or the like.
It is necessary to firmly tighten the oil pan from the viewpoint of maintaining the sealing property of the oil and the strength for supporting the weight of the oil pan and the oil. In this case, the vibration of the engine body is transmitted to the oil pan, which is a factor of deteriorating noise radiation downward.

As a countermeasure against the noise radiation, a method of sandwiching rubber between the engine body and the oil pan to suppress the transmission of vibration to the oil pan may be adopted. Therefore, vibration transmission cannot be completely eliminated. Therefore, the oil pan is supported on the cylinder block side using a connecting member so as to be able to perform vibration isolation, and a film-like elastic member is bonded between the oil pan and the cylinder block between two annular members. A method of sealing with a toting adapter has been proposed (Japanese Utility Model Laid-Open No. 4-109453). In this device, the one annular member is fixed to a cylinder block by a bolt, the other annular member is fixed to an oil pan by a bolt, and the connecting member is fixed to the oil pan by a bolt.

[0004]

However, in the engine disclosed in Japanese Utility Model Laid-Open No. 4-109453, it is necessary to fix the annular member to the cylinder block and the oil pan and fix the connecting member to the oil pan. 3 places
It is difficult to assemble. Also, since there are two contact surfaces between the cylinder block, the oil pan and the annular member,
It is necessary to interpose a sealing member such as a gasket in order to secure the sealing property of the portion, and the sealing property is poor.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide an engine capable of improving the assemblability of the engine and improving the sealing performance of the engine.

[0006]

According to the present invention, an elastic member is adhered to an oil pan and a mounting member is adhered to the elastic member, and a penetration notch is formed in the oil pan so that a fastening member penetrates in a non-contact state. The fastening member was inserted into the through cutout, the mounting member was fixed to the cylinder block by the fastening member, and the oil pan was supported on the cylinder block side by a connecting member so as to be vibration-proof.

It is preferable that the connecting member is a cylinder cover that covers the cylinder block.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings.

FIG. 3 shows an engine according to an embodiment of the present invention. Reference numeral 1 denotes a cylinder block. In this embodiment, a vertically divided structure is adopted, 2 is an upper cylinder block, and 3 is a lower cylinder. It is a cylinder block.
The upper cylinder block 2 has a cylinder section 4,
The lower part is a skirt part 5, and the cylinder part 4 is provided with four bores 6 equally spaced in the longitudinal direction. The bottom of the skirt portion 5 is connected to a lower cylinder block 3 which is open up and down, and a crank chamber 7 is defined by the lower cylinder block 3 to accommodate a crankshaft (not shown) therein. Cylinder block 1 having such a configuration
Has a main bearing 10 for the crankshaft on its longitudinal end walls, i.e., a front wall 8 and a rear wall 9.

A cylinder cover 12 is attached to both side walls 11 along the longitudinal direction of the cylinder block 1 so as to cover the entire wall at a predetermined interval.

The cylinder cover 12 is formed of a steel plate, an aluminum plate, or the like, and is formed by bending according to the shape of the side wall 11 as shown in FIG. The cylinder cover 12 is provided with six holes 13 (see FIG. 5) for attachment to the cylinder block 1. Further, a plurality of through holes 16 are provided at a lower end of the cylinder cover 12 at predetermined intervals in a longitudinal direction for passing bolts for connecting the oil pan 14. The vertical length of the cylinder cover 12 is formed larger than that of the cylinder block 1, and the front-rear length is longer than that of the cylinder block 1. At the front end and the rear end of the cylinder cover 12, two cover mounting holes 19 for mounting the front cover 17 and the rear cover 18 are provided.

As shown in FIGS. 3 and 4, a gap 21 is formed between the cylinder cover 12 and the cylinder block side wall 11 at a predetermined interval. The vibration material is filled up, thereby forming a vibration-proof layer. The vibration isolating layer is specifically a vibration isolating plate 22, and the vibration isolating plate 22 is formed in a rectangular shape whose vertical length and front and rear length are equal to those of the cylinder block side wall 11. The vibration isolating plate 22 is attached at the same time as the cylinder cover 12 and is sandwiched between the cylinder cover 12 and the cylinder block side wall 11. Anti-vibration plate 2 before installation
The thickness of 2 is a constant thickness slightly larger than the gap between the gaps 21, so that after being mounted, it uniformly compresses and deforms in the thickness direction and closely contacts each other. A mounting member 20 for mounting accessories is attached to the cylinder block side wall 11.
Are provided integrally, and these mounting members 20 are
Through the holes (not shown) and the insertion holes 34 of the cylinder cover 12, respectively.

Further, as shown in FIG. 5, the cylinder cover 12 is supported on the cylinder block side wall 11 in a vibration-proof manner. The cylinder cover 1 is provided on the cylinder block side wall 11.
A mounting surface 23 serving as a reference for the position of the second hole 13 is formed, and a bolt hole 25 for fixing a stepped bolt 24 is provided in the mounting surface 23. Corresponding to the position of the mounting surface 23, the vibration isolating plate 22 also has a hole 2 having a larger diameter than the mounting surface 23.
6 are provided. A split-type grooved rubber member 28 is fitted to the shaft 27 of the stepped bolt 24. The peripheral portion of the hole 13 of the cylinder cover 12 is fitted into the groove of the grooved rubber member 28, and the grooved rubber member 28 is fixed to the mounting surface 23 via the washer 29 by the stepped bolt 24.

As shown in FIG. 3, a flange portion 30 is formed along the periphery of the upper end of the oil pan 14. The periphery of the flange portion 30 is further bent to form a bent portion 3
6 are formed. As shown in FIG.
A plurality of through-holes 31 (corresponding to through-cuts of the present invention) are formed at predetermined intervals along the peripheral edge of 0. The through-hole 31 is formed in such a size that a tool such as a nut runner head into which a bolt is screwed can be inserted as described later. A plurality of through holes 37 are formed in the bent portion 36 at predetermined intervals along the bent portion 36. An elastic member 44 having a rectangular cross section and a flat plate shape formed in an annular shape along the shape of the inner peripheral edge thereof is fixed to the flange portion 30 by adhesion, and an annular plate 42 (the mounting of the present invention) is provided on the upper surface of the elastic member 44. ) Are adhered. The elastic member 44 is formed of a material such as silicon rubber. The plate 42 has the through hole 3
A plurality of through-holes 43 are formed at predetermined positions along the plate 42 at positions corresponding to 1. In this manner, the elastic member 44 and the plate 42 are bonded and integrated with the oil pan 14 in advance.

At the lower end of the cylinder block 1 facing the upper surface of the flange 30 of the oil pan 14, a plurality of screw holes 45 are formed at predetermined intervals in correspondence with the through holes 31 and 43. This screw hole 45 has a through hole 43
And the oil pan 14 is positioned below the cylinder block 1 so that the through holes 31 coincide with each other, and a bolt 46 as a fastening member of the present invention is inserted from the through hole 31 side into the screw hole 4.
5 so that the oil pan 14 and the cylinder block 1 are connected to each other. When connected in this manner, a gap is formed between the lower end of the cylinder block 1 and the flange 30 of the oil pan 14, but this gap is closed and sealed by the elastic member 44 and the plate 42. .

At the lower end of the cylinder cover 12, through holes 48 are formed corresponding to the through holes 37 formed in the bent portion 36, and bolts 49 are inserted into these through holes 37, 48. The oil pan 14 is supported by the cylinder block 1 in a vibration-proof manner by being tightened with the nut 50.

Next, the operation of the engine according to the embodiment of the present invention will be described.

Regarding the vibration noise, the cylinder block 1
Direct vibration transmission from the cylinder cover 12 to the cylinder cover 12 is suppressed by the cylinder cover 12 being vibration-proof supported by the grooved rubber member 28. Indirect vibration transmission from the cylinder block side wall 11 due to the airborne sound is greatly reduced because the airborne sound is absorbed by the vibration isolator 22. In particular, most of the vibration isolating plate 22 has a low density of a foamed structure, the hardness is relatively flexible and the soundproofing is high, and since it covers the entire cylinder block side wall 11, its absorption capacity is low. Extremely high. Furthermore, vibration of the cylinder cover 12 itself due to direct transmission is also reduced by the damper effect of the vibration isolator 22. Thus, the vibration of the cylinder cover 12 can be effectively and largely reduced, and the emission of sound from the cylinder cover 12 can be suppressed to greatly reduce the noise.

Since the oil pan 14 is attached to the cylinder cover, the transmission of vibration from the cylinder cover 1 to the oil pan 14 is greatly suppressed.
Noise is suppressed from being radiated.

Further, since the oil pan 14 is connected to the cylinder block 1 via the elastic member 44 and is not rigidly connected, the vibration of the cylinder block 1 is not directly transmitted to the oil pan 14, and from this point, Also, noise emission from the oil pan 14 is suppressed.

On the other hand, in assembling the engine, the elastic member 44 and the plate 42 are integrated with the oil pan 14 in advance by adhesion, so that the handling is easy in assembling and the productivity of assembling is improved. Also,
To connect the cylinder block 1 and the oil pan 14, bolts on the plate 42 and the oil pan 14
Since only two places for bolting the cylinder cover 12 to the cylinder are required, the time and effort for tightening can be reduced as compared with the conventional technique of bolting at three places, and the productivity of assembly is improved. Further, the cylinder block 1 and the plate 42 attached to the oil pan 14 can be fixed by inserting the bolt 46 from the outside of the through hole 31 and screwing it into the screw hole 43, so that assembly is easy. become.

Further, since the elastic member 44 has a flat plate shape, and the flange portion 30 and the plate 42 of the oil pan 14 are also flat plates, it is very easy to integrate them by bonding, thereby simplifying the manufacturing process and manufacturing. Costs can be reduced. In addition, since the height of the elastic member 44 and the plate 42 can be reduced, the height of the engine does not increase.

Next, regarding the sealing performance of the engine, the fastening portion by the bolt is the cylinder block 1 and the plate 4.
2 and the elastic member 44, the plate 42, and the oil pan 14 are integrated by bonding in advance, so that higher sealing performance is secured as compared with the above-described conventional technique of bolting at two locations.

In addition, since it is not necessary to make a significant change in the design of the cylinder block 1, it is possible to divert the cylinder block used in the conventional product.

In the above-described embodiment, the cylinder cover 12 is formed as the connecting member of the present invention. However, the cylinder cover 12 may be formed of a member having a function independent of the cylinder cover, for example, a stay-shaped member. Good.

In the above embodiment, the bent portion 36 of the oil pan 14 and the cylinder cover 12 are directly connected to the bolt 49,
Although connected by the nut 50, an elastic body may be interposed between the bent portion 36 and the cylinder cover 12. Thereby, it is possible to further increase the vibration isolation. When a stay-like member is used as the connecting member, for example, the stay-like member may be firmly connected to the cylinder block, and the stay-like member and the oil pan may be connected via an elastic member. .

In the above embodiment, the plate 42 is directly in contact with the lower end of the cylinder block 1 and is fixed by the bolt 46. However, a suitable sealing means (between the lower end of the cylinder block 1 and the plate 42) is used. For example, a rubber seal, a liquid seal, etc.) may be interposed. This allows
The sealing performance of the portion can be enhanced, and the sealing performance of the engine of the embodiment can be further enhanced.

In this embodiment, the through hole 31 is used as the through notch, but a V notch or a U notch may be used as long as at least the fastening member penetrates in a non-contact manner.

In the above embodiment, an annular plate is used as the plate 42. However, a plurality of plate-like members are formed in accordance with the shape of the lower end of the cylinder block 1 and the shape of the flange 30 of the oil pan 14. It may be a combination in a rectangular shape.

The vibration isolating plate 22 may have its lower end a formed at a higher density than the upper end thereof, that is, the portion b excluding the lower end a. For example, the lower end a of the vibration isolator 22 may have a solid structure instead of a foam structure. In this case, the lower end a
Thereby, the lower end of the gap 21 can be sealed.

[0031]

As described above, according to the present invention, the assemblability of the engine can be improved, and the sealing performance of the engine can be improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an engine according to an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow A in FIG. 1;

FIG. 3 is an overall configuration diagram showing an engine according to an embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of the engine according to the embodiment of the present invention.

FIG. 5 is a diagram showing a support structure of a cylinder cover according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 12 Cylinder cover (connection member) 14 Oil pan 30 Flange part 31 Through hole (through cutout) 42 Plate (mounting member) 44 Elastic member 46 Bolt (fastening member)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02F 11/00 F02F 11/00 C

Claims (2)

[Claims] 1. An elastic member is adhered to an oil pan and a mounting member is adhered to the elastic member. A through-cut is formed in the oil pan so that a fastening member penetrates the oil pan in a non-contact state. The engine is characterized in that the mounting member is fixed to the cylinder block by the fastening member, and the oil pan is supported on the cylinder block side by a connecting member so as to be vibration-proof. 2. The engine according to claim 1, wherein the connecting member is a cylinder cover that covers the cylinder block.