JPH0324817Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internal combustion engine that achieves low noise.

[Conventional technology]

Conventionally, an oil pan in which the upper part of the oil pan is made of a highly elastic material has been proposed for the purpose of damping oil pan vibrations (Japanese Utility Model Publication No. 55-119337). Furthermore, it has been proposed that the oil pan is made of a resin material and the bottom wall is made of a metal plate to improve heat dissipation (Japanese Utility Model Publication No. 57-25141).

Also, for cylinder block and lower deck reinforcement,
A stiffener that covers the bottom surface of the block is used and an oil drain hole is added to it (Japanese Utility Model Publication No. 59-5738)
There are also oil pan butt full plates with a strainer function added (Utility Model Publication No. 56-25007, Utility Model Application Publication No. 57-126513), which have sound insulation functions in addition to the stiffener and strainer functions. have

[Problem that the invention attempts to solve]

As mentioned above, in order to block the block vibrations that are transmitted to the oil pan, the upper part of the oil pan is often made of elastic material, which, like floating support of the oil pan with a rubber gasket, is effective in reducing noise. .

However, when analyzing the behavior of the oil pan during actual operation, membrane vibration occurs in the elastic material (mainly polymeric resin material) portion, and it is necessary to reduce noise generation due to this membrane vibration.

With the structure of the oil pan using the conventional resin material mentioned above (for example, Japanese Utility Model Application Publication No. 55-119337), a large sound insulation effect cannot be obtained against the sound radiated to the side and bottom surfaces, especially the bottom surface, which passes through the oil pan. , measures to prevent transmitted sound are required. In addition, when using a stiffener (Utility Model Application Publication No. 59-5738), although it is effective in improving block rigidity, higher-order vibration components are transmitted to the oil pan, reducing the overall noise level. contribution is small. In addition, if an oil strainer is installed on the intermediate plate (Utility Model 56-25007
(Japanese Utility Model Publication No. 57-126513), since the strainer is made of a wire mesh, its contribution to the shielding of transmitted sound is small.

In order to alleviate these problems, it is conceivable to construct both the upper and lower tanks of the oil pan with high-mass steel plates, etc., but damping due to the resin cannot be expected and the problem of increased weight remains. Furthermore, the sound insulation structure must not interfere with other structures, such as the insertion of an oil level gauge.

The purpose of this invention is to increase the sound insulation effect of the oil pan when the oil pan has both upper and lower tanks, and the upper tank is composed of a resin tank, and also to facilitate the insertion of an oil level gauge in the above sound insulation structure. shall be.

[Means for solving problems]

The internal combustion engine of the present invention which meets this purpose has an oil pan for an internal combustion engine consisting of two tanks, an upper tank and an upper tank, in which the upper tank is made of resin and the lower tank is made of steel plate, and the upper tank has a bottom part. There are multiple ribs that have a convex cross section downward and extend in the direction of the crankshaft, multiple vertical ribs that connect the upper and lower mounting flanges of the upper tank on the side of the upper tank, and an oil level gauge on the bearing beam. It consists of an internal combustion engine with a guiding hole.

[Effect]

In the above oil pan, the resin upper tank is
It has a bottom surface to prevent transmitted sound radiated downward from the engine moving parts, and the bottom surface is provided with multiple ribs with a downwardly convex cross section and running in the engine rank axis direction, increasing the bottom surface rigidity and suppressing bottom plate vibration. is prevented. In addition, on the outer surface of the resin upper tank, a plurality of vertical ribs are provided on each side to connect the upper and lower mounting flanges of the upper tank, increasing the rigidity of the side surface of the upper tank. Noise is reduced by dispersing the membrane vibration mode into higher-order components.

Furthermore, since the bearing beam is provided with a hole for guiding the oil level gauge, there will be no interference with the insertion of the oil level gauge, regardless of the above vibration damping structure.

〔Example〕

An internal combustion engine according to the present invention will be explained below with reference to the drawings.

FIG. 1 shows an internal combustion engine equipped with a two-tank oil pan according to the present invention, and FIG. 2 shows the oil pan taken out. In the figure, a cylinder block 1 is fitted with a two-part oil pan consisting of an upper tank 2 made of resin and a lower tank 3 made of steel plate. Since the lower tank 3 is made of steel plate, it eliminates the risk of damage due to external impact forces such as flying stones and interference from bumps on rough roads, which is a disadvantage of resin materials.
By making the upper tank 2 made of resin, it is 30% lighter than a conventional all-rope oil pan. Since the sides of the oil pan are protected by body members, no problem will occur.

The cylinder block 1 and the upper tank 2 and the upper tank 2 and the lower tank 3 are formed by a notch groove 4 shown in FIGS. 3 and 4.
A liquid gasket 5 coated with a liquid gasket 5 is used as a sealing material, and it is fixed with a stud bolt 6 and nut 7 shown in FIG. 5 or a bolt 8 shown in FIGS. 6 and 7.

3 and 4 show the upper tank 2 taken out. As shown in the figure, the upper tank 2 has a bottom part 9 on the lower surface, and the bottom part 9 vertically separates the space inside the oil pan. The bottom part 9 improves the rigidity of the upper tank 2 itself, and has the effect of preventing twisting deformation and lateral bending deformation. As shown in FIGS. 8 and 9, the bottom portion 9 is provided with a grooved rib 10 that also serves as an oil drain, thereby increasing the rigidity of the bottom portion 9. The rib 10 extends parallel to the axis of the crankshaft. An inclined surface 11 having a downwardly convex cross section is formed in the opening so that oil can easily fall off. Slope 1
1 prevents oil scattering. In FIG. 9, a receiving portion 12 is provided at the lower end of the opening and extends to cover the opening, further blocking sound transmitted through the opening. A filtering net 13 is fixed above the oil drop groove by heat welding or the like using protruding columns 14 provided on the bottom surface 9. Further, the bottom surface portion 9 is provided with an opening hole 17 fitted with a grommet 16 for guiding a strainer pipe 15 fixed to the block 1 side.

Fastening hole 1 on the upper and lower mounting flange parts of the upper tank 2
As shown in FIGS. 10 and 11, 8 and 19 are thick-walled portions 20 and 21, which have higher rigidity than the general flange surfaces.

The upper tank 2, as shown in FIGS. 1 to 4,
The vertical ribs 22 connecting the upper and lower flanges are connected on both sides,
By arranging a plurality of them on each of the front and rear sides, side surface rigidity is increased and side membrane vibration is prevented.

Furthermore, as shown in FIG. 1, a bearing beam 23 is disposed within the oil pan, and the oil level reaches the vicinity of the bearing beam 23.
Oil level gauge 2 is installed on the bearing beam 23.
4 is provided with a hole 25 for guiding it. The hole 25 guides the oil level gauge 24 toward the rib groove.

Next, the operation of the embodiment of the present invention constructed as described above will be explained.

First, the damping effect will be explained. Since the upper tank 2 is made of resin, it has greater damping than an oil pan made entirely of steel plates, and has a damping effect. Since the upper tank 2 has a bottom part 9 made of resin and integral with the side surface, sound directed from above to below is blocked. The bottom surface portion 9 is reinforced with ribs 10 extending parallel to the crankshaft, thereby reinforcing the side surface portions and suppressing membrane vibrations on the side surfaces. The bottom part 9 has a greater sound insulation effect than a conventional wire mesh structure having an oil strainer function. When the opening of the oil pit is covered with the receiving part 12, the effect of blocking transmitted sound is even greater.

Since vertical ribs 22 are integrally provided on the side surface of the upper tank 2, membrane vibration is suppressed and the effect of noise reduction is significant.

FIG. 12 and FIG. 13 respectively show the results of examining the static deformation and dynamic vibration modes of the oil pan using laser holography. Figures 12A and 13A show the case where the upper and lower tanks are integrated and the oil pan is normally tightened without floating on the cylinder block. It can be seen that this occurs. FIGS. 12B and 13B show the case where the upper and lower tanks are integrated and floatingly supported on a cylinder block, and show that vibrations are reduced compared to A. Figures 12C and 13C show the case where the upper and lower tanks are split and the oil pan is floatingly supported on the cylinder block, but since the upper tank is not provided with vertical ribs, the This indicates that membrane vibration is occurring in the tank. Figures 12D and 13D show the present invention in which the upper tank is made of resin and has vertical ribs, the lower tank is made of steel plate, the upper tank and the lower tank are separated, and the oil pan is floatingly supported on the cylinder block. In this case, the pattern shows that the membrane vibration is dispersed and becomes less likely to occur. That is, it is shown that the vertical ribs 22, the floating support, and the upper and lower split type all have a vibration damping effect.

Further, since the bearing beam 23 is provided with a hole 25 to guide the oil level gauge 24, it is possible to measure the oil level appropriately.

[Effect of idea]

When using an internal combustion engine having the above configuration and operation, the following various effects can be obtained.

(b) Since the lower tank is made of steel plate, damage caused by flying stones, etc., which is a drawback of conventional resin oil pans, is eliminated.

(b) By using a resin material for the upper tank, the noise in the high frequency range due to oil pan vibration damping can be reduced, and the weight can also be reduced.

C. Since the upper tank has a bottom part, it not only has a separator function but also improves the rigidity of the upper tank.
Fluctuations in oil level can be kept to a minimum while still functioning as a sound insulator.

D. If the upper tank is attached to the cylinder block using floating support, the sound insulation effect will be enhanced and there will be a significant effect in reducing noise.

E. A hole for guiding the oil level gauge is provided in the bearing beam, so there is no problem in inserting the oil level gauge.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an internal combustion engine according to an embodiment of the present invention, Figure 2 is a sectional view of the oil pan in Figure 1, Figure 3 is a perspective view of the upper tank of the oil pan, and Figure 4 is an oil pan. Perspective view of the upper bread tank shown upside down, No. 5
The figure is a partial sectional view of the oil pan cylinder block attachment part, Figure 6 is a partial sectional view of the floating support of the upper and lower tanks, Figure 7 is a sectional view of the upper and lower tank attachment parts, and Figure 8 is a partial sectional view of the oil pan cylinder block attachment part. The figure is a partial sectional view of the lower part of the upper tank.
The figure is a partial sectional view of another aspect of the oil pan pit.
Figure 10 is a perspective view of the upper flange of the upper tank;
12 is a perspective view of the lower flange portion of the upper tank, FIG. 12 is a modified view of various oil pans, and FIG. 13 is a vibration mode diagram of various oil pans. 1...Cylinder block, 2...Upper tank, 3...
Lower tank, 9...bottom part, 10...grooved rib, 12...
...Receiving part, 22... Vertical rib, 23... Bearing beam, 25... Hole.

Claims (1)

[Scope of utility model registration request] In an oil pan for an internal combustion engine consisting of two upper and lower tanks, the upper tank is made of resin and the lower tank is made of steel plate, the upper tank has a bottom part, and the bottom part has a downwardly convex section and extends in the crankshaft direction. Provided with multiple extending ribs,
An internal combustion engine characterized in that a plurality of vertical ribs connecting upper and lower mounting flanges are provided on the upper tank on a side surface of the upper tank, and a hole for guiding an oil level gauge is provided in the bearing beam.