JPH06185409A - Oil pan of internal combustion engine for vehicle - Google Patents

Abstract

PURPOSE:To secure necessary strength of a side of an oil pan without increasing plate thickness of a first vessel and moreover to prevent degradation of fittingness between a lower end of a cylinder block and an upper end of the first vessel. CONSTITUTION:A first vessel 4 composed of a bottom 4a, side wall 4b and flange 4c is formed of a thin plate, and this vessel 4 serves as a reservoir of lubricating oil for an engine 1. A second vessel 7 composed of a bottom 7a, side wall 7b having holes 8 and flange 7c is formed of a thick plate. The first vessel 4 is inserted and superposed in a second vessel 7 like a cylinder liner. Both the flanges 4c, 7c are fastened to a lower end 2a of a cylinder block 2. In order to protect the side wall 4b of the first vessel 4 against a shock applied from an exterior side to the wall 4b, protective members 11 of rigid bodies each being larger than each hole 8 are fitted to positions corresponding to holes 8 of the second vessel 7, on the side wall 4b of the first vessel 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan which is fastened to a cylinder block of an internal combustion engine mounted on a vehicle and stores lubricating oil of the internal combustion engine.

[0002]

2. Description of the Related Art Noise generated by an internal combustion engine for a vehicle is not only noise directly emitted from an internal combustion engine body such as a cylinder block but also vibration of the internal combustion engine body is transmitted to an oil pan, and the oil pan itself. There is noise caused by the vibration of the. In order to reduce the latter noise, it is effective to reduce the thickness of the oil pan. However, since the oil pan is also required not to be damaged when it interferes with the road surface, there is a limit to making the oil pan evenly thin as described above.

[0003] Therefore, in the past, there has been a conventional method, Sho 59-100949.
The publication discloses an oil pan that is configured by nesting a first container made of a thin plate and a second container made of a thick plate in a nested manner. In this oil pan, holes having a large opening area are provided on the side walls other than the bottom of the second container.

According to the above technique, the weight of the entire oil pan is reduced by the amount of the holes. Therefore, the absolute amount of vibration energy that the oil pan receives from the internal combustion engine body decreases. Along with this, the sound energy emitted from the oil pan into the air becomes smaller. Further, since no hole is provided in the bottom of the second container, there is no risk of damage even if the oil pan interferes with the road surface. As described above, according to the above technique, noise can be reduced without impairing the strength of the oil pan.

[0005]

In the above prior art, only the bottom portion of the oil pan is likely to be damaged, and no hole is provided in the bottom portion of the first container. However, in reality, a portion of the side wall of the first container corresponding to the hole of the second container may be damaged.

On the other hand, in order to reinforce the side wall of the first container, it is conceivable to increase the plate thickness of the side wall to some extent. Here, in manufacturing a general oil pan, a method of pressing a single metal plate having a uniform plate thickness is adopted. Therefore, if the same press working as described above is adopted also in the production of the first container, in this working method, as described above, only the side wall of the first container may be thicker than other portions. Have difficulty. Therefore, in the end,
The first container is formed from a metal plate having a large plate thickness. This means that the portion of the first container that is fastened to the lower end of the cylinder block, that is, the upper end of the first container also becomes thick like the side wall, and the rigidity of the same part increases. Then, when the oil pan is fastened to the cylinder block, it becomes difficult to bend the upper end of the first container along the shape of the lower end of the cylinder block. In other words, the conformability between the lower end of the cylinder block and the upper end of the first container deteriorates, which causes a decrease in sealing performance.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to secure the necessary strength of the side surface and prevent damage without increasing the plate thickness of the first container,
A vehicle in which when the upper end of the first container is fastened to the lower end of the cylinder block, the upper end can be bent along the shape of the lower end and the conformability between the upper and lower ends can be prevented. To provide an oil pan for an internal combustion engine.

[0008]

In order to achieve the above object, the present invention provides a first lubricating oil reservoir which is formed of a thin plate and is fastened to a lower end of a cylinder block of an internal combustion engine for a vehicle at an upper end thereof. A container and a second container formed by a thick plate having a plate thickness larger than that of the first container, and nestably stacked on the first container, and on a side wall of the second container excluding a bottom portion. An oil pan for a vehicle internal combustion engine having a plurality of holes, wherein impact is applied from the outside of the first container to a portion of the side wall of the first container corresponding to each hole of the second container. In order to protect the same place from the above, a protective member that is larger than each of the holes and is made of a rigid body is attached.

[0009]

The bottom of the second container formed by the thick plate has no hole. Therefore, even when the oil pan interferes with the road surface when the vehicle is traveling, the impact at that time is received by the bottom portion of the second container, and it is difficult to reach the bottom portion of the first container.

Further, since a portion corresponding to the hole of the second container is exposed on the side wall of the first container, there is a possibility that a flying stone, a sharp projection or the like hits this portion to give an impact. However, a protective member that is larger than the hole and is made of a rigid body is attached to the side wall of the first container. Therefore, the strength of the side wall is supplemented by the protective member, and the necessary strength of the side surface of the oil pan is secured. Therefore, even if a shock is applied to the oil pan from the outside, a hole that allows the inside and outside of the oil pan to communicate with each other is not opened.

Furthermore, since the side wall of the second container is provided with holes, the entire oil pan is lighter than that in the case where the oil pan is formed from a single plate material having a large plate thickness. Therefore, the absolute amount of vibration energy that the oil pan receives from the cylinder block is small. Therefore, the sound energy radiated into the air by vibrating the oil pan is reduced.

As described above, the strength of the side surface of the oil pan is secured even though the entire first container is formed of the thin plate. Further, since the plate thickness of the upper end portion of the first container fastened to the lower end portion of the cylinder block can be small, the upper end portion of the first container can be easily bent along the shape of the lower end portion of the cylinder block. It is possible.

[0013]

【Example】

(First Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS.

An engine 1 as an internal combustion engine as shown by a chain double-dashed line in FIG. 1 is mounted in the engine room of the vehicle. An oil pan 3 is arranged below the cylinder block 2 of the engine 1. Oil pan 3
Comprises a first container 4 and a second container 7.

The first container 4 is for storing the lubricating oil of the engine 1, and comprises a bottom portion 4a, a side wall 4b having a rectangular frame shape, and a flange 4c around the upper end of the side wall 4b. The material forming the first container 4 is a thin plate having a uniform plate thickness at any part. In this embodiment, an iron plate having a plate thickness of 0.5 to 0.6 mm is used as a thin plate that satisfies this condition. Then, the first container 4 is formed by pressing the iron plate. The flange 4c is provided with a large number of bolt holes 6 through which bolts can be inserted at predetermined intervals.

The second container 7 has a bottom portion 7a, a side wall 7b,
The side wall 7b and the flange 7c around the entire upper end of the side wall 7b have a shape slightly larger than that of the first container 4. The material forming the second container 7 is a thick plate having a uniform plate thickness at any part and having a plate thickness larger than the plate thickness of the first container 4. In this embodiment, an iron plate having a plate thickness of 1.2 to 1.6 mm is used as a thick plate satisfying this condition. The second container 7 is formed by pressing the iron plate. In the flange 7c, a bolt hole 10 is provided at a position corresponding to the bolt hole 6 of the flange 4c. The second container 7
The bottom portion 7a is for protecting the bottom portion 4a of the first container 4 from an impact applied from below and is not provided with a hole. On all side walls 7b of the second container 7,
A plurality of holes 8 having a substantially rectangular shape are formed.

The first container 4 is inserted in the second container 7 in a nested manner. By this insertion, the bottom portion 4a, the side wall 4b and the flange 4c of the first container 4 are overlapped with the bottom portion 7a, the side wall 7b and the flange 7c of the second container 7, respectively. The containers 4 and 7 are fixed to each other by spot welding or the like. In this state, the bottom 4a of the first container 4 is the bottom 7a of the second container 7.
Although it is covered from below by a, most of the side wall 4 b of the first container 4 is exposed in the hole 8 of the second container 7.

On the inner surface of the side wall 4b, a protective member 11 is provided at a location corresponding to each of the holes 8. Each protection member 11 is made of a plate material having a large rigidity and an appropriate weight, for example, a metal plate such as an iron plate, and slightly larger than the corresponding hole 8. And
Each protection member 11 is fixed to the inner surface of the side wall 4b by welding or the like.

The oil pan 3 having the above construction is fixed to the lower end portion 2a of the cylinder block 2 by a bolt (not shown). That is, bolts are inserted into the bolt holes 6 and 10 from the lower side of the flanges 4c and 7c, and these bolts are fastened to the lower end portion 2a of the cylinder block 2.

In the oil pan 3 constructed as described above, the hole 8 is not provided in the bottom portion 7a of the second container 7 formed of a thick plate. Therefore, even when the oil pan 3 interferes with the road surface when the vehicle is traveling, the impact at that time is received by the bottom portion 7a of the second container 7 and damage to the bottom portion 4a of the first container 4 is prevented. It

Further, since the portion of the side wall 4b of the first container 4 corresponding to the hole 8 of the second container 7 is exposed,
When the vehicle is running, etc., flying stones, sharp protrusions, etc. may hit the location from the outside and impact may be applied. However, in this embodiment, an iron plate protection member 11 that is larger than the hole 8 and has high rigidity is fixed to the inner surface of the side wall 4b. Therefore, the strength of the side wall 4b is supplemented by the protective member 11, and the necessary strength of the side surface of the oil pan 3 is secured. Therefore, even if an impact is applied to the oil pan 3 from the outside, a hole that connects the inside and the outside of the oil pan 3 is not opened.

Further, in the oil pan 3, since a substantially rectangular hole 8 is provided in most of the side wall 7b of the second container 7, when the oil pan is formed from one iron plate having a large plate thickness. The entire oil pan 3 is lighter than. Therefore, the absolute amount of vibration energy that the oil pan 3 receives from the cylinder block 2 and the like is small, and the sound energy that the oil pan 3 vibrates and radiates into the air is small.

In addition to this, in this embodiment, each protection member 1
1 functions as a damper mass of the dynamic damper, and a portion of the side wall 4b of the first container 4 corresponding to the hole 8 functions as a spring system of the dynamic damper. The dynamic damper is a technique of adding a weight to the vibration system to change the original natural frequency of the vibration system and reduce vibration of a predetermined frequency. Here, in the state where the protective member 11 was not used, the frequency of the vibration of the side wall 4b, which had a high radiation efficiency and was liable to be a radiated sound, was measured and found to be 1 kHz or higher. On the other hand, if the weight of the protective member 11 is set such that the resonance frequency of the dynamic damper is a low frequency of 100 Hz or lower, the high frequency vibration of 1 kHz or higher will not occur.
Can be reduced as compared with the case of not using (corresponding to the related art). This reduction further reduces the sound emitted from the oil pan 3.

As described above, according to this embodiment, although the first container 4 is entirely formed of a thin plate,
Since the side wall 4b is reinforced by the protection member 11, the strength of the side wall 4b can be secured and damage can be prevented. Moreover, since the plate thickness of the flange 4c, which is a fastening portion with the lower end 2a of the cylinder block 2, can be small, the lower end 2
It is possible to easily bend the flange 4c along the shape of the lower end surface of a. Therefore, when a plate material having a large plate thickness is used in order to increase the strength of the side wall 4b, the conformability of the fastening portion between the cylinder block 2 and the first container 4 deteriorates. It is possible to maintain good conformability and prevent deterioration of the sealing property.

Further, by making the side wall 4b of the first container 4 and the protection member 11 function as a dynamic damper,
It is possible to effectively reduce the vibration of the side wall 4b, which is likely to be a radiated sound, and further improve the noise reduction of the oil pan 3. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, a protection member 12 larger than each hole 8 of the second container 7 is arranged outside the hole 8, and the protection member 12 is connected to the first container 4 via an elastic member 13 such as rubber.
It is fixed to the side wall 4b. The other structure is the same as that of the first embodiment.

Therefore, according to this embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, since the protection member 12 arranged outside the second container 7 is larger than the hole 8, when the protection member 12 is impacted from the outside, the protection member 12 is used as the second container 7. Side wall 7
Upon hitting b, further movement is restricted. Therefore,
The deformation of the side wall 4b of the first container 4 when an impact is applied to the oil pan 3 from the outside is suppressed to a small level, and the side wall 4
Damage to b is reliably prevented.

In this embodiment, the side wall 4b of the first container 4 and the elastic member 13 function as a spring system of the dynamic damper, and the protection member 12 functions as a damper mass of the dynamic damper. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the protection member 14 is formed from one closed portion 14a and a plurality of protection portions 14b.
The closing portion 14a is arranged parallel to the bottom portion 4a so as to close the upper end open portion of the first container 4. Each protection part 14b hangs from the side edge of the closed part 14a. Each protection part 14b
Is larger than the hole 8 of the second container 7. Then, in the protective portion 14b, the protective member 14 is fixed to the inner surface of the first container 4 by welding or the like. The other structure is the same as that of the first embodiment.

Therefore, according to the present embodiment, in addition to exhibiting the same action and effect as the first embodiment, the rigidity of the entire protection member 14 is increased by the closing portion 14a, so that a large impact is exerted on the first container 4. Even when it is applied to the side wall 4b, it is possible to reliably restrict the deformation of the side wall 4b. In addition, the closed portion 1
4a also functions as a baffle plate. That is,
The closing portion 14a functions to suppress the fluctuation of the oil level of the lubricating oil in the first container 4. However, in this case, the function of the dynamic damper is impaired by the closing portion 14a.

The present invention is not limited to the configuration of the above embodiment, and may be arbitrarily modified within the scope not departing from the spirit of the invention, for example, as follows. (1) The shape of the hole 8 of the second container 7 may be appropriately changed to a circle, an ellipse, a triangle, a pentagon or more polygons, and the like. Further, the size and number of the holes 8 may be changed. Along with this, it is necessary to change the number and shape of the protective members 11, 12, and 14.

(2) The first container 4 may be nested on the outside of the second container 7 in a nested manner. (3) As the thin plate forming the first container 4, a rubber plate may be used instead of the metal plate.

[0031]

As described in detail above, according to the present invention, a portion of the side wall of the first container corresponding to each hole of the second container is subjected to the same impact from the outside of the first container. In order to protect the oil container, a protective member, which is larger than each of the holes and is made of a rigid body, is attached. Therefore, the necessary side strength of the oil pan can be secured without increasing the plate thickness of the first container. Therefore, it is possible to prevent the side surface of the oil pan from being perforated. Further, when fastening the upper end of the first container to the lower end of the cylinder block, it is possible to bend the upper end along the shape of the lower end, so that the conformability between the upper and lower ends is improved. Can be prevented from worsening.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil pan according to a first embodiment of the present invention.

FIG. 2 is a perspective view of an oil pan according to the first embodiment.

FIG. 3 is a sectional view of an oil pan according to a second embodiment of the present invention.

FIG. 4 is a sectional view of an oil pan according to a third embodiment of the present invention.

[Description of Reference Signs] 1 ... Engine as internal combustion engine, 2 ... Cylinder block, 2a ... Lower end part, 4 ... First container, 4b, 7b ... Side wall, 4c ... Flange, 7 ... Second container, 7a ... Bottom part , 8
... Hole, 11,12,14 ... Protective member

Claims (1)

[Claims] 1. A first container for lubricating oil storage, which is formed of a thin plate and is fastened to a lower end of a cylinder block of an internal combustion engine for a vehicle at an upper end thereof, and a plate thickness larger than that of the first container. An oil pan for a vehicular internal combustion engine, comprising a second container formed of a plate and nestably stacked on the first container, and having a plurality of holes in a side wall of the second container except a bottom portion. In the side wall of the first container, a position corresponding to each hole of the second container, in order to protect the same position from an impact applied from the outer side of the first container, larger than each hole, An oil pan for an internal combustion engine for a vehicle, further comprising a protective member made of a rigid body.