JP2007315424A - Oil pan structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil pan structure inhibiting air from being sucked from an oil suction port with a simple and light structure. <P>SOLUTION: The oil pan structure is provided with an oil pan 12 including an oil receiving surface 21 and storing oil supplied to an automatic transmission, and a strainer 32 including the oil suction port 33 provided with opposing to the oil receiving surface 21 and sucking oil stored in the oil pan 12. The oil receiving surface 21 includes a region X on which lipophilic treatment is applied, at least at a position where the oil suction port 33 is projected. Moreover, the oil receiving surface 21 includes a region Y on which oil repellant treatment is applied at a position adjoining the region X. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention generally relates to an oil pan structure, and more particularly to an oil pan structure applied to a vehicle.

Regarding a conventional oil pan structure, for example, Japanese Laid-Open Patent Publication No. 10-184859 discloses a lubricating device for an automatic transmission that can be reliably reduced while preventing air from being sucked from an inflow port. (Patent Document 1). In the lubricating device disclosed in Patent Document 1, a portion having a high oil level and a portion having a low oil level are formed in the oil pan. On the other hand, by forming an oil guide groove on the top surface of the strainer, the oil dropped on the top surface of the strainer is guided to a portion having a low oil level. As a result, the oil level in the oil pan is kept uniform, so that air is prevented from being sucked from the inlet along with the oil.
Japanese Patent Laid-Open No. 10-184859

  As disclosed in Patent Document 1 described above, when an oil guide groove is provided in an oil pan, the shape of a part for forming the oil guide groove is complicated, or a new part for forming the oil guide groove is provided. Need to add. For this reason, there exists a possibility of causing the increase in manufacturing cost or the weight.

  Accordingly, an object of the present invention is to solve the above-described problem, and to provide an oil pan structure that suppresses air from being sucked from an oil suction port with a simple and lightweight configuration.

  An oil pan structure according to one aspect of the present invention is an oil pan structure connected to a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface, has an oil pan for storing oil to be supplied to the mechanism, and an oil suction port disposed to face the oil receiving surface. An oil suction part for sucking. The oil receiving surface includes a first region that has been subjected to a lipophilic treatment at least at a position where the oil suction port is projected. The oil receiving surface further includes a second region subjected to oil repellent treatment at a position adjacent to the first region.

  An oil pan structure according to another aspect of the present invention is an oil pan structure connected to a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface, has an oil pan for storing oil to be supplied to the mechanism, and an oil suction port disposed to face the oil receiving surface. An oil suction part for sucking. The oil receiving surface includes a first region that has been subjected to a lipophilic treatment at least at a position where the oil suction port is projected. The oil receiving surface further includes a second region where neither the lipophilic treatment nor the oil repellent treatment is performed at a position adjacent to the first region.

  An oil pan structure according to still another aspect of the present invention is an oil pan structure connected to a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface, has an oil pan for storing oil to be supplied to the mechanism, and an oil suction port disposed to face the oil receiving surface. An oil suction part for sucking. The oil receiving surface includes a first region where neither the lipophilic treatment nor the oil repellent treatment is performed at least at a position where the oil suction port is projected. The oil receiving surface further includes a second region subjected to oil repellent treatment at a position adjacent to the first region.

  According to the oil pan structure configured as described above, the first region and the second region of the oil receiving surface are selectively subjected to a lipophilic treatment or an oil repellent treatment, whereby the oil is relatively It becomes easy to stay and in the 2nd field, oil becomes difficult to stay relatively. Accordingly, even when the amount of oil in the oil pan is small, the oil can be collected in the first region facing the oil suction port. Further, in the present invention, the oil can be collected at a desired position by the surface treatment applied to the oil receiving surface, so that the component shape is not complicated and new components are not added. For this reason, it is possible to suppress air from being sucked from the oil suction port with a simple and lightweight configuration.

  Preferably, the second region is formed so as to surround the periphery of the first region. According to the oil pan structure configured as described above, oil can be collected from the four sides of the first region at positions facing the oil suction port. Thereby, it can suppress more effectively that air is inhaled from an oil suction inlet.

  Preferably, the oil receiving surface includes a bottom portion extending in a substantially horizontal direction below the oil suction port and an inclined portion rising in an oblique direction with respect to the horizontal direction from a peripheral edge of the bottom portion. The oil receiving surface includes a first region at the bottom and a second region at the inclined portion. According to the oil pan structure configured as described above, the oil transmitted through the inclined portion can be more actively flowed toward the bottom portion, and the oil can be accumulated in the bottom portion. Thereby, it can suppress more effectively that air is inhaled from an oil suction inlet.

  Preferably, the first region extends in a circular shape on the oil receiving surface. According to the oil pan structure configured as described above, the oil stays in the first region in a form in which the surface tension is not easily broken, and therefore, the oil collected in the first region hardly flows out to the second region.

  An oil pan structure according to still another aspect of the present invention is an oil pan structure connected to a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface, and includes an oil pan that stores oil supplied to the mechanism and an oil suction unit that sucks oil stored in the oil pan. The oil suction portion has a facing surface facing the oil receiving surface and an oil suction port provided in the facing surface. The oil receiving surface is opposed to a position where the distance between the oil suction port and the peripheral edge of the opposing surface is relatively small, the first region where the lipophilic treatment is performed, the oil suction port, and the peripheral surface of the opposing surface And a second region that has been subjected to an oil repellent treatment.

  An oil pan structure according to still another aspect of the present invention is an oil pan structure connected to a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface, and includes an oil pan that stores oil supplied to the mechanism and an oil suction unit that sucks oil stored in the oil pan. The oil suction portion has a facing surface facing the oil receiving surface and an oil suction port provided in the facing surface. The oil receiving surface is opposed to a position where the distance between the oil suction port and the peripheral edge of the opposing surface is relatively small, the first region where the lipophilic treatment is performed, the oil suction port, and the peripheral surface of the opposing surface And a second region in which neither the lipophilic treatment nor the oil repellent treatment is performed.

  An oil pan structure according to still another aspect of the present invention is an oil pan structure connected to a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface, and includes an oil pan that stores oil supplied to the mechanism and an oil suction unit that sucks oil stored in the oil pan. The oil suction portion has a facing surface facing the oil receiving surface and an oil suction port provided in the facing surface. The oil receiving surface is opposed to a position where the distance between the oil suction port and the peripheral edge of the opposing surface is relatively small, the first region where neither the lipophilic treatment nor the oil repellent treatment is performed, and the oil suction A second region that is opposed to a position where the distance between the mouth and the peripheral edge of the opposing surface is relatively large and that has been subjected to an oil repellent treatment.

  According to the oil pan structure configured as described above, the oil flows toward the oil suction port in the first region facing the position where the distance between the oil suction port and the peripheral edge of the facing surface becomes relatively small. In the second region facing the position where the distance between the oil suction port and the peripheral edge of the opposing surface is relatively large, the oil is less likely to flow toward the oil suction port. In this case, since the oil in the first region is preferentially sucked from the oil suction port, the oil tends to be insufficient in the first region.

  On the other hand, by selectively applying a lipophilic treatment or an oil repellent treatment to the first region and the second region of the oil receiving surface, the oil is likely to stay relatively in the first region, and in the second region, , The oil is relatively difficult to stay. Thereby, even when the amount of oil in the oil pan is small, the oil can be collected in the first region where the oil tends to be insufficient. Further, in the present invention, the oil can be collected at a desired position by the surface treatment applied to the oil receiving surface, so that the component shape is not complicated and new components are not added. For this reason, it is possible to suppress air from being sucked from the oil suction port with a simple and lightweight configuration.

  As described above, according to the present invention, it is possible to provide an oil pan structure that suppresses air from being sucked from the oil suction port with a simple and lightweight configuration.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
1 is an exploded view showing an automatic transmission to which an oil pan structure according to Embodiment 1 of the present invention is applied. The automatic transmission shown in the figure is mounted on a vehicle.

  Referring to FIG. 1, a housing of an automatic transmission 10 includes a transmission case 11 that is opened vertically downward, and an oil pan 12 that is attached to the transmission case 11 so as to close the opening position. . The transmission case 11 is composed of gears, shafts, bearings, and the like, and houses a gear train for shifting the power output from the engine and outputting it to the drive shaft side.

  The oil pan 12 has an oil receiving surface 21. The oil pan 12 is formed in a saucer shape. The oil pan 12 is made of metal. The oil pan 12 is made of, for example, a steel plate. The oil pan 12 may be made of resin.

  FIG. 2 is a cross-sectional view of the automatic transmission along the line II-II in FIG. Referring to FIGS. 1 and 2, a predetermined amount of oil is sealed in the casing of automatic transmission 10, and oil pan 12 receives the oil on oil receiving surface 21. Oil is called ATF (automatic transmission fluid) and functions as a lubricant to operate clutches for shifting gears, transmit torque converter force, and prevent seizure between gears and other mechanical elements. To do.

  A valve body 31 that performs hydraulic control is disposed at the bottom of the gear train housed in the transmission case 11. The valve body 31 is made of, for example, an aluminum alloy. The valve body 31 is disposed at a position spaced vertically from the oil receiving surface 21.

  A strainer 32 is provided at the bottom of the valve body 31. The strainer 32 removes foreign matter in the oil supplied from the oil pan 12 to the valve body 31. The entire strainer 32 is accommodated in the oil pan 12. The strainer 32 is positioned between the oil receiving surface 21 and the valve body 31.

  The strainer 32 has a bottom surface 32 c and an oil suction port 33. The bottom surface 32 c extends to face the oil receiving surface 21. The oil suction port 33 is provided on the bottom surface 32c. The oil suction port 33 is provided to face the oil receiving surface 21. The oil suction port 33 is provided at a position spaced vertically from the oil receiving surface 21. The oil stored in the oil pan 12 is introduced into the strainer 32 through the oil suction port 33.

  FIG. 3 is a plan view showing an oil receiving surface of the oil pan in FIG. FIG. 4 is a table showing the form of surface treatment applied to the oil receiving surface in FIG.

  Referring to FIGS. 3 and 4, oil receiving surface 21 includes at least a region X that extends to a position where oil suction port 33 is projected and a region Y that extends to a position adjacent to region X. The region X extends in an elliptical shape within a predetermined range around the position where the oil suction port 33 is projected. A region X exists at a position where the oil suction port 33 is projected onto the oil receiving surface 21 at a right angle. The region Y extends so as to surround the periphery of the region X. The region Y extends over the entire oil receiving surface 21 excluding the region X.

The region X is subjected to a lipophilic treatment. The oleophilic treatment is a surface treatment that improves the wettability of the oil receiving surface 21 to oil. Examples of the lipophilic treatment include a coating treatment using titanium oxide (TiO ₂ ) or a manganese crystal salt, and an organic phosphate treatment. The region Y is subjected to oil repellent treatment. The oil repellent treatment is a surface treatment that reduces the wettability of the oil receiving surface 21 to oil. Examples of the oil repellent treatment include a coating treatment using polytetrafluoroethylene (PTFE) or the like.

  As another form of surface treatment applied to the oil receiving surface 21, the region X is subjected to lipophilic treatment. In the region Y, neither the lipophilic treatment nor the oil repellent treatment is performed. As still another form of the surface treatment applied to the oil receiving surface 21, neither the lipophilic treatment nor the oil repellent treatment is performed on the region X. The region Y is subjected to oil repellent treatment. In any form, the wettability of the oil receiving surface 21 to oil is higher in the region X than in the region Y.

  FIG. 5 is a cross-sectional view showing the state of oil stored in the oil pan in FIG. Referring to FIG. 5, when the amount of oil stored in oil pan 12 is small, there is a risk that air will be sucked into oil suction port 33. On the other hand, in the present embodiment, the region X and the region Y of the oil receiving surface 21 are selectively subjected to the lipophilic treatment or the oil repellency treatment, so that the oil is likely to stay relatively in the region X. In the region Y, the oil is relatively difficult to stay. Moreover, while it becomes difficult for air to flow into the area | region X from the area | region Y, oil becomes difficult to flow into the area | region Y from the area | region X. As a result, it is possible to prevent oil from collecting in the region X facing the oil suction port 33 and sucking air from the oil suction port 33.

  FIG. 6 is a plan view showing a modified example of the region X spreading on the oil pan receiving surface in FIG. 3. With reference to FIG. 6A, in this modification, the region X extends in a perfect circle shape. The region X may be a circle other than an ellipse and a perfect circle. When the region X is formed in a circular shape, the oil stays in the region X in a form in which the surface tension is not easily broken, so that the oil collected in the region X hardly flows out to the region Y. With reference to FIG. 6B, the region X is not limited to a circular shape, and may be formed in a rectangular shape.

  The shape of the region X and the region Y and the range in which these regions are formed are not limited to the forms shown in FIGS. 3 and 6, and are matched to the shape of the oil receiving surface 21 and the position of the oil suction port 33. Are appropriately changed.

  The oil pan structure in Embodiment 1 of the present invention is connected to an automatic transmission 10 as a mechanism to which oil is supplied via an oil passage. The oil pan structure has an oil receiving surface 21, an oil pan 12 that stores oil to be supplied to the automatic transmission 10, and an oil suction port 33 that is disposed to face the oil receiving surface 21. And a strainer 32 as an oil suction part for sucking oil stored in the pan 12. The oil receiving surface 21 includes a region X as a first region where the lipophilic treatment is performed at least at a position where the oil suction port 33 is projected. The oil receiving surface 21 further includes a region Y as a second region subjected to oil repellent treatment at a position adjacent to the region X.

  In another form, the oil receiving surface 21 includes a region X as a first region subjected to a lipophilic process at least at a position where the oil suction port 33 is projected. The oil receiving surface 21 further includes a region Y as a second region where neither the lipophilic treatment nor the oil repellent treatment is performed at a position adjacent to the region X. In yet another embodiment, the oil receiving surface 21 includes a region X as a first region where neither the lipophilic treatment nor the oil repellent treatment is performed at least at a position where the oil suction port 33 is projected. The oil receiving surface 21 further includes a region Y as a second region subjected to oil repellent treatment at a position adjacent to the region X.

  According to the oil pan structure according to the first embodiment of the present invention configured as described above, it is possible to prevent the automatic transmission 10 from being supplied with oil mixed with air. As a result, it is possible to avoid a situation in which the lubricating oil film is interrupted in the gear train or the controllability of the automatic transmission 10 deteriorates due to a decrease in hydraulic pressure. Moreover, in this Embodiment, said effect can be acquired by the structure which only performs the surface treatment to the oil receiving surface 21. FIG. For this reason, it is possible to prevent the weight of the oil pan 12 from increasing and the component cost from increasing.

  In particular, when a vehicle equipped with the automatic transmission 10 is used in a cold region, the oil temperature may become below freezing (for example, about −30 ° C.) at the time of starting. At this time, the viscosity of the oil becomes very high, and the return of the oil to the oil pan 12 becomes worse. For this reason, the oil level in the oil pan 12 is significantly reduced. Further, when the vehicle suddenly accelerates or starts suddenly, an inertial force acts on the oil stored in the oil pan 12 to cause a deviation. In these cases, sufficient oil does not exist around the oil suction port 33, and the risk of air being sent to the strainer 32 increases. For these reasons, the oil pan structure according to the present invention can be more effectively applied to an oil pan mounted on a vehicle.

  FIG. 7 is a sectional view showing a modification of the oil pan in FIG. FIG. 8 is a plan view showing an oil receiving surface of the oil pan in FIG.

  7 and 8, in this modification, the oil receiving surface 21 has a bottom portion 21p extending in a substantially horizontal direction below the oil suction port 33, and an oblique direction with respect to the substantially horizontal direction from the bottom portion 21p. Inclined portions 21q and 21r rising to There is a bottom 21p at a position where the oil suction port 33 is projected on the oil receiving surface 21 at a right angle. The inclined portion 21q and the inclined portion 21r are disposed on both sides of the bottom portion 21p. Each of the inclined portion 21q and the inclined portion 21r has a certain inclination. The inclined portion 21q and the inclined portion 21r may be formed by bending so as to change the inclination in the middle. The inclined portion 21q and the inclined portion 21r may be formed to be curved.

  Oil receiving surface 21 includes region X at bottom 21p and region Y at inclined portions 21q and 21r. With such a configuration, the oil transmitted through the inclined portions 21q and 21r can be made to flow positively toward the bottom portion 21p, and a large amount of oil can be stored in the bottom portion 21p. Thereby, it is possible to suppress the oil shortage around the oil suction port 33.

  In the present embodiment, the case where the present invention is applied to the automatic transmission 10 has been described. However, the present invention may be applied to a manual transmission or a continuously variable transmission (CVT) in addition to the automatic transmission. it can. In addition to the transmission, the present invention can be applied to a wet sump type machine including an oil pan, such as an engine, a power shovel, and a work robot.

(Embodiment 2)
FIG. 9 is a plan view showing an automatic transmission to which an oil pan structure according to Embodiment 2 of the present invention is applied. FIG. 9 is a diagram corresponding to FIG. 8 in the first embodiment.

  Referring to FIG. 9, the oil pan structure in the present embodiment has a position where surface treatment is applied to oil receiving surface 21 as compared with the oil pan structure in FIGS. 7 and 8 in the first embodiment. Different. In the present embodiment, oil pan 12 includes region X and region Y. The region X faces a position where the distance (L1) between the oil suction port 33 and the periphery of the bottom surface 32c is relatively small. The region X may further extend to a position where the oil suction port 33 is projected. The region Y faces a position where the distance (for example, L2) between the oil suction port 33 and the peripheral edge of the bottom surface 32c becomes relatively large. Region X and region Y are subjected to lipophilic treatment or oil repellent treatment according to the form shown in FIG.

  The region X faces a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32c is the smallest. A bottom portion 21p exists at a position where the bottom surface 32c is projected on the oil receiving surface 21 at a right angle. Oil receiving surface 21 includes region X and region Y at bottom 21p. The oil receiving surface 21 may further include a region Y in the inclined portions 21q and 21r. Region X is adjacent to region Y. The region Y may be formed so as to surround the periphery of the region X.

  In the oil pan 12 having such a configuration, the oil on the oil receiving surface 21 flows toward the oil suction port 33 at a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32 c becomes relatively small. In the position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32 c is relatively large, the oil on the oil receiving surface 21 hardly flows toward the oil suction port 33. For this reason, the oil in the region X is preferentially sucked into the oil suction port 33, and the oil tends to be insufficient in the region X.

  On the other hand, oil can be collected in the region X by subjecting the region X and region Y of the oil receiving surface 21 to selective lipophilic treatment or oil repellency treatment. Thereby, air can be prevented from being sucked from the oil suction port 33.

  In the oil pan structure according to the second embodiment of the present invention, the strainer 32 has a bottom surface 32c as a facing surface facing the oil receiving surface 21, and an oil suction port 33 provided in the bottom surface 32c. The oil receiving surface 21 is opposed to a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32c is relatively small, and the region X as the first region subjected to the lipophilic treatment and the oil suction port And a region Y as a second region which is opposed to a position where the distance between 33 and the peripheral edge of the bottom surface 32c becomes relatively large and which has been subjected to oil repellent treatment.

  In another embodiment, the oil receiving surface 21 is opposed to a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32c becomes relatively small, and is a region as a first region subjected to lipophilic treatment. A region Y as a second region that faces X and a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32c is relatively large, and in which neither the lipophilic treatment nor the oil repellent treatment is performed. including. In yet another embodiment, the oil receiving surface 21 faces a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32c becomes relatively small, and both the lipophilic process and the oil repellent process are performed. A region X as a first region that is not performed, and a region Y as a second region that is opposed to a position where the distance between the oil suction port 33 and the peripheral edge of the bottom surface 32c is relatively large and subjected to an oil repellent treatment. including.

  According to the oil pan structure in the second embodiment of the present invention configured as described above, an effect similar to the effect described in the first embodiment can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is an exploded view showing an automatic transmission to which an oil pan structure according to Embodiment 1 of the present invention is applied. It is sectional drawing of the automatic transmission along the II-II line in FIG. It is a top view which shows the oil receiving surface of the oil pan in FIG. It is a table | surface which shows the form of the surface treatment given to the oil receiving surface in FIG. It is sectional drawing which shows the state of the oil stored by the oil pan in FIG. It is a top view which shows the modification of the area | region X extended on the oil pan receiving surface in FIG. It is sectional drawing which shows the modification of the oil pan in FIG. It is a top view which shows the oil receiving surface of the oil pan in FIG. It is a top view which shows the automatic transmission to which the oil pan structure in Embodiment 2 of this invention was applied.

Explanation of symbols

  10 automatic transmission, 12 oil pan, 21 oil receiving surface, 21p bottom, 21q, 21r inclined part, 32 strainer, 32c bottom, 33 oil suction port.

Claims (9)

An oil pan structure connected via an oil passage to a mechanism to which oil is supplied,
An oil pan having an oil receiving surface and storing oil to be supplied to the mechanism;
An oil suction port disposed opposite to the oil receiving surface, and an oil suction part for sucking oil stored in the oil pan;
The oil receiving surface includes a first region subjected to an oleophilic treatment at least at a position where the oil suction port is projected, and further, an oil repellent treatment is performed at a position adjacent to the first region. An oil pan structure including the second region. An oil pan structure connected via an oil passage to a mechanism to which oil is supplied,
An oil pan having an oil receiving surface and storing oil to be supplied to the mechanism;
An oil suction port disposed opposite to the oil receiving surface, and an oil suction part for sucking oil stored in the oil pan;
The oil receiving surface includes a first region that has been subjected to a lipophilic treatment at least at a position where the oil suction port is projected, and further, at a position adjacent to the first region, a lipophilic treatment and an oil repellent treatment. An oil pan structure including a second region in which none of the processes is performed. An oil pan structure connected via an oil passage to a mechanism to which oil is supplied,
An oil pan having an oil receiving surface and storing oil to be supplied to the mechanism;
An oil suction port disposed opposite to the oil receiving surface, and an oil suction part for sucking oil stored in the oil pan;
The oil receiving surface includes a first region where neither the lipophilic treatment nor the oil repellent treatment is performed at least at a position where the oil suction port is projected, and further, at a position adjacent to the first region, An oil pan structure including a second region subjected to an oil repellent treatment.   The oil pan structure according to any one of claims 1 to 3, wherein the second region is formed so as to surround a periphery of the first region. The oil receiving surface includes a bottom portion extending in a substantially horizontal direction below the oil suction port, and an inclined portion rising in an oblique direction with respect to the horizontal direction from a peripheral edge of the bottom portion,
5. The oil pan structure according to claim 1, wherein the oil receiving surface includes the first region at the bottom portion and includes the second region at the inclined portion.   The oil pan structure according to any one of claims 1 to 5, wherein the first region extends in a circular shape on the oil receiving surface. An oil pan structure connected via an oil passage to a mechanism to which oil is supplied,
An oil pan having an oil receiving surface and storing oil to be supplied to the mechanism;
An oil suction portion that has a facing surface facing the oil receiving surface and an oil suction port provided in the facing surface, and sucks oil stored in the oil pan;
The oil receiving surface is opposed to a position where a distance between the oil suction port and a peripheral edge of the facing surface is relatively small, and a first region subjected to a lipophilic treatment, the oil suction port, and the An oil pan structure that includes a second region that is opposed to a position where a distance between the peripheral surface of the opposing surface is relatively large and that has been subjected to an oil repellent treatment. An oil pan structure connected via an oil passage to a mechanism to which oil is supplied,
An oil pan having an oil receiving surface and storing oil to be supplied to the mechanism;
An oil suction portion that has a facing surface facing the oil receiving surface and an oil suction port provided in the facing surface, and sucks oil stored in the oil pan;
The oil receiving surface is opposed to a position where a distance between the oil suction port and a peripheral edge of the facing surface is relatively small, and a first region subjected to a lipophilic treatment, the oil suction port, and the An oil pan structure that includes a second region that is opposed to a position where the distance from the periphery of the facing surface is relatively large and in which neither the lipophilic treatment nor the oil repellent treatment is performed. An oil pan structure connected via an oil passage to a mechanism to which oil is supplied,
An oil pan having an oil receiving surface and storing oil to be supplied to the mechanism;
An oil suction portion that has a facing surface facing the oil receiving surface and an oil suction port provided in the facing surface, and sucks oil stored in the oil pan;
The oil receiving surface is opposed to a position where the distance between the oil suction port and the peripheral edge of the facing surface is relatively small, and the first region where neither the lipophilic treatment nor the oil repellent treatment is performed. An oil pan structure including a second region which is opposed to a position where a distance between the oil suction port and a peripheral edge of the facing surface is relatively large and which has been subjected to an oil repellent treatment.

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