JP6810620B2 - Oil case - Google Patents

Description

The present invention relates to an oil case having an oil pan and a strainer.

In vehicles such as automobiles, oil for lubricating various parts (for example, mission oil) is used. Oil is generally stored in an oil case below the vehicle body. For example, as described in Patent Document 1, an oil pan and a strainer are arranged in the oil case, and the oil is sucked by the suction port provided in the strainer and the oil is circulated to each part of the vehicle. To.

Japanese Unexamined Patent Publication No. 2008-185084

By the way, when the vehicle suddenly accelerates, decelerates, or makes a sharp turn, the oil stored in the oil pan is biased in the oil pan due to the gravitational acceleration (G) and the inertial force. If the oil is biased in the oil pan, the oil runs out at the lower part of the suction port of the strainer, and the suction port is exposed to air. When the suction port of the strainer is exposed to air, when the oil is sucked, the air is also sucked (so-called air suction). If air is sucked from the suction port of the strainer, abnormal noise or abnormal hydraulic pressure may occur.

In view of such problems, it is an object of the present invention to provide an oil case capable of suppressing the occurrence of abnormal noise and abnormal hydraulic pressure.

In order to solve the above problems, the oil case of the present invention has an oil pan having a bottom, a strainer in which the bottom surface on which the suction port is formed faces the bottom of the oil pan, and a strainer arranged in the vicinity of the suction port. It is provided on one or both of the bottom of the oil pan and the bottom of the strainer at at least one position in the front position in the traveling direction or the width direction of the vehicle with respect to the suction port , and projects in the direction opposite to the bottom and the bottom. It is provided with a convex portion in which the amount of protrusion increases as it approaches the suction port .

The convex portion may be provided on the front side in the traveling direction of the vehicle with respect to the suction port.

The convex portion may be formed by being curved in the direction along the suction port.

The side surface of the convex portion extending in the longitudinal direction may be formed so as to be curved with respect to the protruding direction.

According to the present invention, it is possible to suppress the occurrence of abnormal noise and abnormal hydraulic pressure.

It is a figure for demonstrating an oil case. It is a figure which shows the shape of a bead, and the arrangement relation with a suction port. It is a figure explaining the movement of the oil of the oil pan of the comparative example. It is a figure which showed the movement of the oil when a vehicle suddenly starts and accelerates. It is a table for explaining that the rigidity of an oil pan changes by providing a bead. It is a figure for demonstrating a modification.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in such an embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown. To do.

In the transmission, transmission oil is circulated to lubricate the internal parts. The transmission oil is stored in an oil pan provided below the transmission. The stored mission oil is sucked up by the oil pump and circulated inside the transmission. The oil case in which the mission oil is stored will be described below as an example.

FIG. 1 is a diagram for explaining the oil case 1. As shown in FIG. 1, the oil case 1 includes a strainer 10 and an oil pan 30. FIG. 1 shows a vertical cross section of the strainer 10 and the oil pan 30. In the following, the front shown in FIG. 1 will be described as the traveling direction (front side) of the vehicle, and the rear will be described as the backward direction (rear side) of the vehicle.

The strainer 10 and the oil pan 30 are arranged, for example, vertically below the transmission of the vehicle. The strainer 10 includes a main body 12 having an open vertical upper side (upper side in FIG. 1), and at least a part of the main body 12 on the vertically lower side enters the oil pan 30 and is arranged. Further, the strainer 10 is arranged on the vertically lower side of the transmission (not shown) and on the vertically upper side of the oil pan 30. That is, the bottom surface 14 of the main body 12 of the strainer 10 and the bottom portion 32 of the oil pan 30 face each other. The oil pan 30 is a container with an open vertical upper side, and is fastened to a transmission (transmission) (not shown) with, for example, bolts. Further, oil (mission oil) is stored in the oil pan 30.

The main body 12 of the strainer 10 is a hollow component, and has a filter 16, a suction port 18, and an opening 20. The filter 16 is made of a filter material (mesh or non-woven fabric) or the like, and is arranged in the space inside the main body 12. The suction port 18 is formed on the bottom surface 14 of the strainer 10. The suction port 18 is open (communication) inside the oil pan 30. The opening 20 is provided in an open portion on the vertically upper side of the strainer 10 described above. The opening 20 is arranged at a position horizontally displaced from the suction port 18. Here, the opening 20 is arranged on the front side of the vehicle with respect to the suction port 18. The opening 20 is connected to the suction side of an oil pump (not shown).

When the pump connected to the opening 20 is operated, the oil stored in the oil pan 30 is sucked into the strainer 10 through the suction port 18. The sucked oil passes through the filter 16 and the opening 20 and is sucked into the oil pump and discharged to a lubrication target such as a transmission. When the oil passes through the filter 16, foreign substances such as metal powder and dust contained in the oil are removed.

The bottom portion 32 of the oil pan 30 faces the bottom surface 14 of the main body 12 of the strainer 10 at a distance from each other. A bead 40 is formed on the bottom 32 of the oil pan 30. The bead 40 is formed so as to extend vertically from the bottom 32 of the oil pan 30 (on the bottom 14 side of the main body 12 of the strainer 10). In other words, the bead 40 is formed so as to project from the bottom 32 of the oil pan 30 (in the direction opposite to the bottom 32 and the bottom 14). The bead 40 is arranged in the vicinity of the suction port 18 as shown in FIG. The bead 40 is arranged, for example, on the front side in the traveling direction of the vehicle with respect to the suction port 18.

FIG. 2 is a diagram showing the shape of the bead 40 and the arrangement relationship with the suction port 18. As shown in FIGS. 2A and 2B, the bead 40 is formed by raising the bottom 32 of the oil pan 30 toward the bottom 14 of the strainer 10. The bead 40 has an upper portion 42 and a side portion 44.

The upper portion 42 has three surfaces (upper surface 42a, first inclined surface 42b, and second inclined surface 42c) facing the bottom surface 14 of the strainer 10. The upper surface 42a is formed at a position where the length in the vertical direction (height direction) of the beads 40, that is, the amount of protrusion of the beads 40 is maximum. The upper surface 42a is closest to the bottom surface 14 of the strainer 10 among the upper portions 42. Further, as shown in FIG. 2B, the upper surface 42a is arranged in the vicinity of the suction port 18 in the upper portion 42.

The first inclined surface 42b and the second inclined surface 42c are surfaces extending from the upper surface 42a, respectively. The first inclined surface 42b extends from one end 42d of the upper surface 42a toward one end 40a of the bead 40. The length of the bead 40 in the vertical direction (the amount of protrusion of the bead 40) decreases from one end 42d of the upper surface 42a toward one end 40a of the bead 40. That is, the first inclined surface 42b is inclined so as to be lowered so as to be separated from the upper surface 42a.

The second inclined surface 42c extends from the other end 42e of the upper surface 42a toward the other end 40b of the bead 40. The length of the bead 40 in the vertical direction (the amount of protrusion of the bead 40) decreases from the other end 42e of the upper surface 42a toward the other end 40b of the bead 40. That is, the second inclined surface 42c is inclined so as to be lowered so as to be separated from the upper surface 42a. As described above, the length of the bead 40 in the vertical direction is such that the first inclined surface 42b and the second inclined surface 42c far from the suction port 18 are short, and the upper surface 42a near the suction port 18 is long. In other words, the amount of protrusion of the bead 40 increases as it approaches the suction port 18. More specifically, as shown in FIG. 2A, the vertical length of the bead 40 is the lowest at both ends (one end 40a of the bead 40 and the other end 40b of the bead 40) (length La). The upper surface 42a on the center side is the highest (length Lb). That is, it can be said that the protrusion amount (length in the vertical direction) of the bead 40 is partially different.

Further, as shown in FIG. 2B, the bead 40 is curved so that the upper surface 42a is located at the frontmost position and the first inclined surface 42b and the second inclined surface 42c are located behind the upper surface 42a. ing. In other words, the upper portion 42 is formed with one end 40a of the bead 40 and the other end 40b of the bead 40 curved in a direction along the suction port 18 with the upper surface 42a as the center.

The side surface portion 44 is a surface extending in the longitudinal direction of the bead 40. The side surface portions 44 are surfaces extending from the bottom portion 32 of the oil pan 30 to the upper portion 42 of the bead 40, and are provided in pairs on the bead 40 as shown in FIG. 2 (b). One of the side surface portions 44 faces the front side of the vehicle, and the other side of the side surface portion 44 faces the rear side of the vehicle. The distance between the pair of side surface portions 44 in the front-rear direction of the vehicle is small on the upper 42 side and larger on the bottom 32 side. Therefore, it can be said that the side surface portion 44 is raised at a predetermined angle with respect to the vertical direction as shown in the cross section in FIG.

FIG. 3 is a diagram illustrating the movement of oil in the oil pan 50 of the comparative example. The oil pan 50 of this comparative example is different from the present embodiment only in that the bead 40 is not provided. While the vehicle is running, as described above, oil is sucked through the filter 16 by an oil pump (not shown). When suddenly starting or accelerating, the oil stored in the oil pan 50 is biased toward the rear side of the vehicle in the oil pan 50 due to gravitational acceleration (G) and inertial force, as shown in FIG. 3A. It ends up.

At this time, when the liquid level of the oil approaches the suction port 18, the oil is rapidly sucked into the suction port 18 from the front side of the vehicle. As a result, as shown by the black arrow in FIG. 3B, air is sucked into the suction port 18 together with the oil (air suction is generated). When air suction occurs, abnormal noise is generated, or the oil pump runs idle, causing an abnormal oil pressure (a state in which the oil pressure is low). Therefore, in the present embodiment, as shown in FIG. 1, the bead 40 is provided in the vicinity of the suction port 18 to suppress air suction.

FIG. 4 is a diagram showing the movement of oil when the vehicle suddenly starts or accelerates according to the present embodiment. As shown in FIG. 4A, by providing the bead 40 in the oil pan 30, even if the oil is biased toward the rear side of the vehicle, the suction port 18 of the strainer 10 is less likely to be exposed to air. For example, in FIG. 4B, the white arrow line indicates the velocity vector of the oil flow when the oil is sucked. As shown in FIG. 4B, by providing the bead 40, it is more likely that the oil is sucked into the suction port 18 from the rear side and the left-right direction side of the vehicle than when the oil gets over the bead 40 from the front side of the vehicle. The velocity vector of the flow becomes large. That is, more oil is sucked into the suction port 18 from the vertical direction and the right direction in the figure than from the left direction in the figure. Specifically, when the oil is sucked into the suction port 18, the bead 40 becomes a resistance to the oil stored on the front side of the vehicle with respect to the suction port 18. As a result, when the oil is biased, a part of the oil gets over the bead 40 and is sucked into the suction port 18, and the other part is sucked into the suction port 18 so as to hit the bead 40 from the vertical direction in the figure. To. As a result, even if the liquid level of the oil approaches the suction port 18 at the time of sudden start or sudden acceleration, the oil is not rapidly sucked into the suction port 18 from the front side of the vehicle, that is, the liquid level side. As described above, the oil case 1 of the present embodiment can reduce air suction, and can suppress the occurrence of abnormal noise and hydraulic abnormality.

Further, by providing the bead 40 in the oil pan 30, the rigidity of the oil pan 30 is improved. FIG. 5 is a table for explaining that the rigidity of the oil pan is changed by providing the bead. Here, the primary eigenvalues were measured for each shape (oil pans 30 and 50) without changing the mass of the oil pan as much as possible so that the comparison could be easily performed for each shape. In FIG. 5, the primary eigenvalue indicates the magnitude of the frequency at which the oil pan begins to vibrate. The larger the primary eigenvalue, the slower the start of vibration of the oil pan. That is, the larger the primary eigenvalue, the less likely the oil pan will vibrate. Further, here, the primary eigenvalue is synchronized with the engine speed. A large primary eigenvalue means that the oil pan does not vibrate until the engine speed reaches a high speed state, that is, it becomes difficult to vibrate at a low speed. As shown in the figure, it can be seen that the oil pan 30 of the present embodiment having the bead 40 has a larger primary eigenvalue and improved rigidity as compared with the oil pan 50 of the comparative example having no bead 40.

Further, by providing the bead 40 in the oil pan 30, it is possible to improve the fuel efficiency. That is, as a measure to prevent air suction, it is possible to increase the amount of oil and keep the liquid level high. However, if more oil is added, the total weight of the vehicle will be heavier and fuel efficiency will deteriorate. That is, in the oil case 1 of the present embodiment, the amount of oil stored in the oil pan 30 can be reduced, the total weight of the vehicle can be reduced, fuel efficiency can be improved, and air suction can be reduced. It is possible to suppress the occurrence of abnormal noise and abnormal oil pressure.

FIG. 6 is a diagram for explaining a modified example. The description of the configuration substantially the same as that of the bead 40 described above will be omitted. As shown in FIG. 6A, the oil pan 60 is provided with a bead 62. As shown in FIGS. 6A and 6B, the bead 62 is provided with a pair of side surface portions 64a and 64b extending in the longitudinal direction. The side surface portion 64b faces the front side of the vehicle, and the side surface portion 64a faces the rear side of the vehicle. As shown in FIG. 6B, the distance between the side surface portions 64a and 64b in the front-rear direction is small on the vertical upper side and large on the bottom side. Further, both the side surface portions 64a and 64b have a curved shape, the side surface portion 64a has the center of curvature positioned on the side surface portion 64b side with the side surface portion 64a as the boundary, and the side surface portion 64b has the side surface portion 64b as the boundary. The center of curvature is located on the side surface portion 64a side. That is, the side surface portions 64a and 64b are formed to be curved with respect to the projecting direction of the bead 62 so as to bulge outward from the center side in the width direction of the bead 62. Here, the curvatures of the side surface portions 64a and 64b are constant over the longitudinal direction, and the curvatures of the side surface portions 64a and 64b are equal to each other.

As shown in FIG. 6C, comparing the oil pan 30 of the present embodiment and the oil pan 60 of the modified example, the side surface portion 64a and the side surface portion 64b of the bead 62 are curved to be primary. It can be seen that the eigenvalue has increased. Originally, the primary eigenvalue can be increased by increasing the mass, but in the modified example oil pan 60, the primary eigenvalue can be increased without increasing the mass. That is, the oil pan 60 can reduce air suction and further increase the rigidity.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Will be done.

Further, in the above-described embodiment and modification, the case where the beads 40 and 62 are provided on the bottom 32 of the oil pans 30 and 60 has been described. However, the beads 40 and 62 may be provided on the bottom surface 14 of the strainer 10 or may be provided on both the oil pans 30 and 60 and the strainer 10.

Further, in the above-described embodiments and modifications, the beads 40 and 62 have described the case where the upper portion 42 is separated from the bottom surface 14 of the strainer 10. However, the beads 40 and 62 may be connected to both the bottom 32 of the oil pans 30 and 60 and the bottom 14 of the strainer 10.

Further, in the above-described embodiments and modifications, the case where the lengths of both ends (one end 40a and the other end 40b) of the beads 40 and 62 are the smallest in the vertical direction has been described. However, the lengths of both ends of the beads 40 and 62 in the vertical direction may be the highest. In any case, the beads need only have a partially different protrusion amount, and the position where the protrusion amount is maximized is not necessarily limited to the vicinity of the suction port 18.

Further, in the above-described embodiments and modifications, the beads 40 and 62 have been described in the case where the side surface portion 44 is curved along the suction port 18, but the beads 40 and 62 may be formed in a cylindrical shape so as to surround the suction port 18. Good.

Further, in the above-described modification, the bead 62 has the same curvature of the side surface portions 64a and 64b, but the side surface portions 64a and 64b may have different curvatures. Further, for example, the center of curvature of the side surface portion 64a may be curved so as to be located on the side opposite to the side surface portion 64b with the side surface portion 64a as a boundary. In this case, the bead 62 has a curved shape so as to bulge toward the center side in the width direction.

Further, in the above-described embodiments and modifications, the case where the lengths of the beads 40 and 62 in the vertical direction are the longest in the portion closest to the suction port 18 has been described. However, when the length of the portion of the beads 40 and 62 closest to the suction port 18 in the vertical direction is the longest, it is merely an example. For example, both ends of the beads 40 and 62 (one end 40a and the other end 40b) may be provided. It may be the longest. In that case, when the vehicle suddenly starts or accelerates and the oil is biased toward the rear side of the vehicle, the oil level hits the beads 40 and 62. Then, a large amount of oil flows into the places where the lengths of the beads 40 and 62 in the vertical direction are short (the center side of the beads 40 and 62 (the one closer to the suction port 18)). Therefore, the suction port 18 is less likely to be exposed to air, and the same effect as that of the above embodiment is realized.

Further, in the above-described embodiments and modifications, the case where the vehicle suddenly starts or accelerates has been described. However, when the vehicle suddenly starts or accelerates suddenly, it is merely an example. For example, when focusing on the case where the vehicle makes a sharp turn, it is preferable to provide beads 40 and 62 in the width direction of the oil pans 30 and 60. By providing the beads 40 and 62 in the width direction of the oil pans 30 and 60, the same effect as described above can be obtained when the vehicle makes a sharp turn. That is, it goes without saying that the beads 40 and 62 can be set at positions other than those illustrated above according to the design.

The present invention can be applied to an oil case having an oil pan and a strainer.

1 Oil case 10 Strainer 14 Bottom 18 Suction port 30, 60 Oil pan 32 Bottom 40, 62 Beads (convex)
44, 64a, 64b side surface

Claims (4)

An oil pan with a bottom and
A strainer with the bottom surface on which the suction port is formed facing the bottom of the oil pan, and a strainer.
It is arranged in the vicinity of the suction port, and is provided on either or both of the bottom of the oil pan and the bottom of the strainer at at least one position in the front position in the traveling direction or the width direction of the vehicle with respect to the suction port . A convex portion that protrudes in the opposite direction between the bottom portion and the bottom surface and increases as the amount of protrusion approaches the suction port .
Oil case with. The oil case according to claim 1, wherein the convex portion is provided on the front side in the traveling direction of the vehicle with respect to the suction port. The oil case according to claim 1 or 2 , wherein the convex portion is formed so as to be curved in a direction along the suction port. The oil case according to any one of claims 1 to 3 , wherein the side surface extending in the longitudinal direction of the convex portion is formed so as to be curved with respect to the protruding direction.

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