JPH0455213Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an oil pan structure for a vehicle engine.

(Prior Art) In vehicle engines, especially those mounted horizontally on the vehicle body, such as front-mounted engines and front-wheel drive vehicles (F/F vehicles), it is usually The mounting direction of the engine is set so that the exhaust manifold is located toward the front of the vehicle body. On the other hand, since the intake passage is equipped with a large number of devices such as an air cleaner and a fuel supply device, it is usually arranged above the engine in consideration of ease of maintenance of these devices.

Therefore, an exhaust pipe, one end of which is connected to an exhaust manifold placed on the front side of the vehicle relative to the engine, and which guides exhaust gas from the engine to the rear of the vehicle, inevitably bypasses the area below the engine from the front of the vehicle. It will be pulled out to the rear of the vehicle. Specifically, as shown in FIG. 3, a recess 36 extending in the width direction is formed in a part of the oil pan that is fastened to the lower surface of the cylinder block 32 of the engine, and the exhaust pipe 34 is inserted through this recess 36. It is customary to pull the engine out from the front of the vehicle to the rear of the vehicle. In FIG. 3, reference numeral 35 denotes an exhaust pipe protector that surrounds the outside of the exhaust pipe 34.

However, when the recess 36 for passing the exhaust pipe 34 is formed at the bottom of the oil pan 31 in this way, the shallow dish part 37 of the shallow dish and the deep dish part 3 of the deep bottom are inevitably separated.
8 is formed, and the rigidity of the shallow dish part 37 is naturally weaker than that of the deep dish part 38.

Therefore, for example, if the oil pan 31 is cast from an aluminum alloy that has lower toughness than a steel plate,
If an excessive load is applied to the oil pan 31 during a car collision, etc., the oil pan 31
Cracks are likely to occur in the shallow dish portion 37, which has the lowest rigidity. If a crack occurs in the shallow pan 37 of the oil pan 31, the oil in the oil pan 31 will leak to the outside from the crack, causing a It is also conceivable that the dust may fall on the exhaust pipe protector 35 (directly on the exhaust pipe 34 if the exhaust pipe protector 35 is not installed), evaporate due to the heat of the exhaust pipe protector 35, and emit a bad odor to the surrounding area.

A known example of a cast oil pan is disclosed in Japanese Utility Model Publication No. 55-34248.

(Purpose of the invention) The present invention is an attempt to solve the problems pointed out in the prior art section above.In an engine in which the exhaust pipe is located below the oil pan, the present invention is designed to prevent oil from flowing into the exhaust pipe using a simple structure. The purpose of this project was to propose an oil pan structure for a vehicle engine that prevents the occurrence of bad odors caused by adhesion and also reduces vibration noise caused by oil pan membrane vibration. .

(Means for Achieving the Object) As a means for achieving the above object, the present invention provides a deep dish part for storing oil at the bottom of an oil pan, and a shallow dish shallower than the deep dish part. In the vehicle engine, an exhaust pipe is arranged below the shallow dish part, and an oil absorbing material is provided on the lower surface side of the oil pan shallow dish part located above the exhaust pipe. It is something.

(Function) In the present invention, by the above means, (1) Since the oil absorbing material is arranged on the lower surface side of the shallow dish part of the oil pan located above the exhaust pipe, for example, it is difficult to crack the shallow dish part of the oil pan. Even if oil leaks from this area due to oil leakage, this oil will be absorbed and collected by the oil absorbing material and will be prevented from dripping into the exhaust pipe. (2) Oil absorbing material is provided in the shallow pan of the oil pan. Therefore, effects such as controlling the generation of membrane vibration of the oil pan due to the mutual interference effect due to the difference in the natural frequencies of the two can be obtained.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 and 2 show the bottom of a multi-cylinder automobile engine equipped with an oil pan structure according to an embodiment of the present invention, and in each figure, reference numeral 1 indicates the main body of the present invention, which will be described in detail later. 2 is a cylinder block, 3 is a transmission, 4 is an exhaust pipe, and 5 is an exhaust pipe protector that surrounds the outside of the exhaust pipe 4.

The oil pan 1 is integrally cast and formed from an aluminum alloy, and includes a bottom wall 11 and a bottom wall 11.
It is provided with a side wall 12 that is continuous with the circumference. Furthermore, this oil pan 1 has its depth changed in two stages in the cylinder arrangement direction, with the part located on the transmission 3 side having a shallow shallow dish part 21, and the part located on the side opposite to the transmission 3 having a shallow depth. The portion where it is located is a deep dish portion 22. still,
Of the shallow dish part 21 and the deep dish part 22, the shallow dish part 21
mainly functions as a recovery passage for oil flowing down from the cylinder block 2 side to the oil pan 1 side,
Further, the deep dish portion 22 functions as an oil storage portion outside the oil recovery passage.

Further, inside the oil pan 1, reinforcing ribs 13, 14, and 15 are provided so as to partition a shallow dish part 21 and a deep dish part 22 in the cylinder arrangement direction. The reinforcing ribs 13, 14, 15 have oil holes 16, 16, . . . formed at their bottoms, as shown in FIGS. 13, 14,
They are communicated with each other through 15 oil ports 16, 16, . . . .

In addition, in this embodiment, each reinforcing rib 1
The thickness dimensions of 3, 14, and 15 are set so that the closer to the shallow dish portion 21, the thicker the portions are. That is, among the three reinforcing ribs 13, 14, 15 of this embodiment, the first reinforcing rib 13 provided on the shallow dish portion 21
The third reinforcing rib 15 is the thickest and is provided in the deep dish portion 22 and at the farthest position from the shallow dish portion 21.
is the thinnest. In this way, each reinforcing rib 1
By setting the thicknesses 3, 14, and 15, the rigidity of the oil pan 1 has a gradient in the cylinder arrangement direction such that it is highest on the shallow dish part 21 side and decreases as it moves away from the shallow dish part 21. It is considered a characteristic.

On the other hand, when the oil pan 1 is configured with the shallow dish part 21 and the deep dish part 22 as described above, the recess 18 is recessed upward under the shallow dish part 21 and extends in the width direction of the oil pan 1. is formed. This recess 18 functions as a space for arranging the exhaust pipe 4, and as shown in FIGS. An exhaust pipe 4 that is cut and drawn out from the front side of the engine toward the rear of the vehicle body is arranged so as to be spaced apart from the shallow dish portion 21. Furthermore, an exhaust pipe protector 5 is attached to the outside of the exhaust pipe 4.

As described above, the oil pan 1 is made of an aluminum alloy casting having relatively low toughness, and the exhaust pipe 4 is disposed below the shallow dish portion 21, which is likely to have the weakest rigidity among the oil pans 1 due to its shape. In some cases, for example, when an automobile crashes, an excessive load is applied to the oil pan 1, causing the shallow dish portion 21 to
If a crack occurs in the crack, oil that leaks to the outside from the crack and drips downward from the bottom surface of the shallow dish portion 21 will adhere to the exhaust pipe protector 5, which has become hot due to exhaust heat, and will evaporate. As mentioned above, there is a risk of emitting a bad odor to the surrounding area.

In order to prevent the occurrence of bad odors caused by oil adhering to the exhaust pipe protector 5 (exhaust pipe 4 if the exhaust pipe protector 5 is not provided), the present invention is adopted in this embodiment. An oil absorbing material 6 is attached to the lower surface side of the shallow dish portion 21 of the oil pan 1. Specifically, as shown in FIGS. 1 and 2, the oil-absorbing material 6 is formed by molding polynorformene rubber, which is a fibrous material and has good heat resistance and oil absorption rate, into a plate shape. There is. Then, this oil absorbing material 6 is attached to the shallow dish portion 21 of the oil pan 1 and to a portion located above the exhaust pipe 4, and is further tightened with fixing bolts 8, 8, etc. via the mounting stays 7, 7, 7. It is fixed to the shallow dish portion 21 side.

By doing this, for example, in the unlikely event that an impact force at the time of a collision occurs, the shallow dish portion 21 of the oil pan 1
Even if a crack occurs and oil leaks to the outside from this crack portion, this leaked oil is effectively adsorbed and collected by the oil absorbing material 6 attached to the lower surface of the shallow dish portion 21. Therefore, the leaked oil is prevented from dripping to the exhaust pipe protector 5 side, and as a result, the occurrence of a bad odor due to the evaporation of the oil adhering to the exhaust pipe protector 5 is prevented in advance and reliably. Become.

Furthermore, in this embodiment, reinforcing ribs 13, 1 provided inside the oil pan 1 as described above are used.
Among 4 and 15, the thickness of the first reinforcing rib 13 provided particularly in the shallow dish portion 21 is made thicker than the other ribs,
The first reinforcing rib 13 increases the rigidity of the shallow dish portion 21 to prevent cracks from occurring in the shallow dish portion 21, and also to prevent the oil pan 1 from being strong enough to resist. When an excessive load is applied, the shallow dish portion 21
The crack is caused to occur at a position away from the center, for example on the third reinforcing rib 15 side.

Therefore, due to the synergistic effect of installing the oil absorbing material 6, setting the rigidity of the oil pan 1 as described above, and setting the rigidity of the oil pan 1 as described above, the exhaust pipe protector 5 This will further reliably prevent oil adhesion.

In this embodiment, each reinforcing rib 13,
Oil ports 16 and 1 are provided at the bottom of 14 and 15, respectively.
6..., when the engine is tilted in the direction of the crankshaft, for example when cornering, each of these reinforcing ribs 13, 14, 15 functions as a full plate and prevents oil in the oil pan 1. It acts to stabilize the oil level.

(Effect of the invention) The oil pan structure of the vehicle engine of the invention is as follows:
A vehicle engine in which a deep dish part for storing oil and a shallow dish part shallower than the deep dish part are formed at the bottom of the oil pan, and an exhaust pipe is disposed below the shallow dish part. The oil absorbing material is characterized in that an oil absorbing material is provided on the lower surface side of the oil pan shallow dish portion located above the exhaust pipe.

Therefore, according to the present invention, (1) the simple structure of providing an oil absorbing material on the lower surface side of the shallow pan of the oil pan located above the exhaust pipe prevents cracks from occurring in the shallow pan; Even if oil leaks from the exhaust pipe, this oil can be absorbed and collected by the oil-absorbing material, preventing it from dripping into the high-temperature exhaust pipe.As a result, the occurrence of bad odors due to oil evaporation can be prevented. (2) The occurrence of membrane vibration in the oil pan is effectively controlled due to mutual interference caused by the difference in natural frequencies between the oil pan and the oil absorbing material, and the vibration noise of the engine as a whole is reduced accordingly. Practical effects such as this can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of an oil pan portion of a vehicle engine equipped with an oil pan structure according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of the main part of FIG. 1, and FIG. FIG. 2 is a side view of an oil pan portion of a vehicle engine having a conventional oil pan structure. 1...Oil pan, 2...Cylinder block,
3...transmission, 4...exhaust pipe, 5...
...Exhaust pipe protector, 6...Oil absorbing material, 7...Mounting stay, 8...Fixing bolt, 11...Bottom wall,
12... Side wall, 13-15... Rib, 16... Oil vent, 18... Recessed portion, 21... Shallow plate portion, 22...
Deep dish section.

Claims (1)

[Scope of utility model claims] A vehicle engine in which a deep dish part for storing oil and a shallow dish part shallower than the deep dish part are formed at the bottom of the oil pan, and an exhaust pipe is disposed below the shallow dish part. An oil pan structure for a vehicle engine, characterized in that an oil absorbing material is provided on the lower surface side of the oil pan shallow dish portion located above the exhaust pipe.