JP5245759B2 - Oil pan - Google Patents

Description

  The present invention relates to an oil pan, and more particularly to an oil pan used for an internal combustion engine.

  In an internal combustion engine, it is desirable to raise the temperature of lubricating oil at an early stage during warm-up from the viewpoint of improving fuel consumption. Patent Document 1 discloses an oil pan including a main body that stores oil, a cover that covers the entire outer side of the main body, and a heat insulating member that is made of inorganic fibers packed between the side surface of the main body and the cover. Yes. According to this technique, heat radiation from the side surface of the oil pan can be suppressed by the heat insulating member.

JP 2001-355422 A

  In the oil pan according to Patent Document 1, heat dissipation from the side surface of the oil pan can be suppressed, but it is difficult to suppress heat dissipation from the bottom surface of the oil pan. Therefore, the heat insulation performance of the oil pan is not high. Moreover, since the oil pan concerning patent document 1 has the structure where the heat insulation member which consists of inorganic fibers was packed between the main body and the cover, the coupling | bonding force of a main body, a cover, and a heat insulation member is weak. Therefore, since it is necessary to increase the thickness of the main body and the cover in order to ensure the rigidity required for the oil pan, the total height of the oil pan may be increased.

  An object of this invention is to provide the oil pan which can have high heat insulation performance and high rigidity.

An oil pan according to the present invention is formed in a container shape opened toward an internal combustion engine body, and has a first metal member that stores oil, and an entire surface of the first metal member opposite to the side in contact with the oil. And a second metal member that covers a surface of the heat insulating member opposite to the first metal member, and the heat insulating member is attached to the first metal member and the second metal member. The heat insulating member is fixed, and extends from an end portion of the first metal member and has an extending portion that covers the end portion .

  According to the oil pan of the present invention, since the heat insulating member covers the entire surface of the first metal member opposite to the side in contact with the oil, not only heat radiation from the side surface of the oil pan but also the bottom surface of the oil pan. The heat radiation from can also be suppressed. Thereby, a high heat insulation effect can be obtained.

Further, since the heat insulating member is fixed to the first metal member and the second metal member, the first metal member, the heat insulating member and the second metal member are firmly coupled and integrated. As a result, compared to a structure in which, for example, a heat insulating member made of inorganic fibers is packed between the first metal member and the second metal member, it can have high rigidity. In this case, the thickness of the first metal member can be reduced to the manufacturing limit, for example. Thereby, the total height of the oil pan can be kept low. Further, according to this configuration, heat conduction from the first metal member to the internal combustion engine body can be suppressed by the extending portion of the heat insulating member. Thereby, compared with the oil pan which does not have an extension part, high heat insulation performance can be acquired.

  ADVANTAGE OF THE INVENTION According to this invention, the oil pan which can have high heat insulation performance and high rigidity can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described.

  An oil pan 10 according to Embodiment 1 of the present invention will be described. FIG. 1 is a schematic cross-sectional view of an oil pan 10 according to the first embodiment. The oil pan 10 is used by being connected to the lower part of the internal combustion engine main body 100. The internal combustion engine main body 100 is not particularly limited, but is a cylinder block, for example. The oil pan 10 includes a first metal member 11, a heat insulating member 12, and a second metal member 13.

  The first metal member 11 is formed in a container shape opened toward the internal combustion engine main body 100. The first metal member 11 stores oil for internal combustion engine lubrication in an inner region surrounded by a bottom surface and side surfaces. The first metal member 11 is made of a material whose main component is a metal such as aluminum (Al) or magnesium (Mg).

  The heat insulating member 12 covers the entire surface of the first metal member 11 opposite to the side in contact with the oil. The heat insulating member 12 is a member made of a heat insulating material having high heat insulating performance as compared with the metal constituting the first metal member 11 and the second metal member 13. The heat insulating member 12 is fixed to the first metal member 11 and the second metal member 13.

  The second metal member 13 covers the entire surface of the heat insulating member 12 opposite to the first metal member 11 side. The 2nd metal member 13 consists of material which has metals, such as aluminum and magnesium, as a main component, for example. A flange 14 is formed at the end of the second metal member 13. The flange 14 is formed with a bolt through hole (not shown) for bolting the oil pan 10 to the internal combustion engine body 100. That is, the flange 14 has a function as a connection part for connecting the oil pan 10 to the internal combustion engine main body 100.

  The oil pan 10 is manufactured by the following method. First, the 1st metal member 11 and the 2nd metal member 13 which were formed in the container shape as shown in FIG. 1 are prepared. Next, a heat insulating material is cast or injection molded between the first metal member 11 and the second metal member. Specifically, the heat insulating material in a molten state is cast between the first metal member 11 and the second metal member 13 so as to cover the entire surface of the first metal member 11 opposite to the side in contact with the oil. Eject. The oil pan 10 is manufactured by the above method. The heat insulating member 12 is fixed to the first metal member 11 and the second metal member 13 by casting or injection molding. In the oil pan 10 manufactured in this way, the first metal member 11, the heat insulating member 12, and the second metal member 13 are firmly coupled and integrated.

  The heat insulating material that is a constituent material of the heat insulating member 12 is not particularly limited as long as it has a higher heat insulating performance than the constituent metals of the first metal member 11 and the second metal member 13 and can be cast or injection molded. . However, the heat insulating material is preferably lightweight. This is because the weight of the oil pan 10 can be reduced.

  The oil pan 10 is connected to the lower part of the internal combustion engine main body 100 and stores oil in an inner region. When the oil pan 10 is connected to the lower part of the internal combustion engine main body 100, the oil pan 10 surrounds the crank, the crankshaft and the like from below. Therefore, the oil pan 10 has a function as a crankcase in addition to a function as an oil storage part of the internal combustion engine.

  According to the oil pan 10 according to the present embodiment, since the heat insulating member 12 covers the entire surface of the first metal member 11 opposite to the side in contact with the oil, only heat radiation from the side surface of the oil pan 10 can be achieved. Therefore, heat radiation from the bottom surface of the oil pan 10 can also be suppressed. Thereby, a high heat insulation effect can be obtained. As a result, fuel consumption can be improved in the warm-up process. For example, even when the temperature of the road surface is low, it is possible to prevent the heat of the oil from being taken away by the heat insulating member 12 covering the bottom surface of the first metal member 11.

  Further, since the heat insulating member 12 is fixed to the first metal member 11 and the second metal member 13, the first metal member 11, the heat insulating member 12, and the second metal member 13 are firmly coupled and integrated. . As a result, compared to a structure in which, for example, a heat insulating member made of inorganic fibers is packed between the first metal member 11 and the second metal member 13, it can have high rigidity. As a result, the thickness of the first metal member 11 can be reduced to the manufacturing limit, for example. Thereby, the total height of the oil pan 10 can be kept low. Further, by reducing the thickness of the first metal member 11, the heat capacity of the entire internal combustion engine including the internal combustion engine body 100 and the oil pan 10 can be reduced.

  Instead of forming the heat insulating member 12 between the first metal member 11 and the second metal member 13 as in the present embodiment, the heat insulating member is, for example, the inner surface of the oil pan (the surface in contact with the oil) or It is also possible to improve the heat insulation performance of the oil pan by arranging it on the outer surface. However, when the heat insulating member is disposed on the inner or outer surface of the oil pan, the heat insulating member may be peeled off from the oil pan. Therefore, after-maintenance of the oil pan is required. Moreover, when arrange | positioning a heat insulation member in the inner surface of an oil pan, since a heat insulation member will contact oil, oil resistance is requested | required of a heat insulation member. Therefore, the room for selecting a material for the heat insulating member is limited. In that respect, according to the oil pan 10 according to the present embodiment, since the heat insulating member 12 is formed between the first metal member 11 and the second metal member 13, there is no fear of peeling of the heat insulating member 12. . Further, the heat insulating member 12 may not have oil resistance. Furthermore, since there is no fear of peeling of the heat insulation member 12, the freedom degree of the shape of the oil pan 10 also becomes high.

  Then, the oil pan 10a which concerns on Example 2 of this invention is demonstrated. FIG. 2 is a schematic cross-sectional view of an oil pan 10a according to the second embodiment. The oil pan 10a differs from the oil pan 10 of FIG. 1 in that it includes a heat insulating member 12a instead of the heat insulating member 12. The heat insulating member 12 a is different from the heat insulating member 12 in that it has an extending portion 15 that is a portion extending from an end portion of the first metal member 11.

  The extending portion 15 covers the end portion of the first metal member 11. Specifically, the extending portion 15 is folded on the inner surface side of the first metal member 11. Thereby, the end portion of the first metal member 11 is covered with the extending portion 15. In this case, when the oil pan 10a is connected to the internal combustion engine body 100, the contact of the first metal member 11 with the internal combustion engine body 100 is suppressed.

  According to the oil pan 10 a according to the present embodiment, since the end portion of the first metal member 11 is covered by the extending portion 15, when the oil pan 10 is connected to the internal combustion engine main body 100, the first Heat conduction from the metal member 11 to the internal combustion engine main body 100 can be suppressed. Thereby, the oil pan 10a can have higher heat insulation performance than the oil pan 10 according to the first embodiment.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

FIG. 1 is a schematic cross-sectional view of an oil pan 10 according to the first embodiment. FIG. 2 is a schematic cross-sectional view of an oil pan 10a according to the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Oil pan 11 1st metal member 12 Heat insulation member 13 2nd metal member 14 Flange 15 Extension part 100 Internal combustion engine main body

Claims (1)

A first metal member that is formed in a container shape that opens toward the internal combustion engine body and stores oil;
A heat insulating member covering the entire surface of the first metal member opposite to the side in contact with the oil;
A second metal member that covers a surface opposite to the first metal member side of the heat insulating member,
The heat insulating member is fixed to the first metal member and the second metal member,
The said heat insulation member has an extending part which covers the said edge part while extending from the edge part of the said 1st metal member, The oil pan characterized by the above-mentioned.

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