JP6809251B2 - Oil pan - Google Patents

Description

The present invention relates to an oil pan mounted on a vehicle.

An oil pan for storing the oil that lubricates the internal combustion engine is provided below the internal combustion engine mounted on the vehicle, and the oil pan is provided with an oil strainer that removes foreign matter from the oil sucked up by the oil pump. .. As a conventional oil pan having an oil strainer, for example, the one described in Patent Document 1 is known.

This oil pan has two high and low bottom surfaces having different heights across a plate, and a shallow high-level bottom surface and a deep low-level bottom surface are connected via a curved portion. There is. The oil strainer is integrally formed with the bottom surface on the lower side.

Special Publication No. 62-24730

A transmission is connected to the internal combustion engine provided with such an oil pan, and the transmission vibrates in the vertical and horizontal directions due to the vibration of the internal combustion engine, the vibration of the vehicle, and the like. As a result, the vibration of the transmission is transmitted to the oil pan.

In the conventional oil pan, the bottom surface on the high side and the bottom surface on the low side are connected via a curved portion, and the portion of the oil pan having the bottom surface on the high side (hereinafter referred to as the high side oil pan portion) , The rigidity of the oil pan portion having the lower bottom surface (hereinafter referred to as the lower oil pan portion) is low.

Therefore, when the transmission is connected to the oil pan portion on the higher side, the oil pan portion on the lower side is likely to be deformed starting from the curved portion due to the vibration of the transmission. Since an oil strainer is integrally provided on the lower oil pan portion, if the lower oil pan portion is deformed, the oil stored in the lower oil pan portion will be shaken significantly. Therefore, the oil strainer may suck in air, and the oil pump may suck in this air.

The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to provide an oil pan capable of increasing rigidity and suppressing deformation.

The present invention has a cylinder block transmission is connected, and the central axis of rotation of the crankshaft is provided in the installed internal combustion engine vehicles to face in the width direction of the vehicle, and the lower portion of the cylinder block An oil pan connected to the transmission, wherein the internal combustion engine passes through a cylinder head provided on the upper part of the cylinder block and the front of the cylinder block from the cylinder head, and from below the oil pan. The oil pan has an exhaust pipe extending to the rear of the internal combustion engine, and the oil pan has a first oil pan portion and the first oil pan portion so as to be deeper than the first oil pan portion. A second oil pan portion having a bottom wall located below the bottom wall of the first oil pan portion, and a curved portion that curves from the bottom wall of the first oil pan portion toward the bottom wall of the second oil pan portion. An oil strainer portion is formed integrally with the first oil pan portion, and the oil strainer portion extends from the side wall of the first oil pan portion to the bottom wall of the first oil pan portion. The oil pan extends along the direction of the rotation center axis of the crank shaft, and the oil pan has a bulging portion on the bottom wall of the first oil pan portion on the front side with respect to the oil strainer portion, and the bulging portion. The portion bulges upward from the bottom wall of the first oil pan portion, and the bottom wall of the bulging portion inclines downward from the front wall of the first oil pan portion toward the rear. The rear end portion in the inclined direction is connected to the oil strainer portion, the exhaust pipe faces the curved portion in the width direction of the vehicle, and is below the bulging portion of the first oil pan portion. It is characterized by passing through .

As described above, according to the present invention, the rigidity of the oil pan can be increased and the deformation of the oil pan can be suppressed.

FIG. 1 is a bottom view of the front part of a vehicle provided with an oil pan according to an embodiment of the present invention. FIG. 2 is a front view of a power unit provided with an oil pan according to an embodiment of the present invention. FIG. 3 is a top view of an oil pan according to an embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line in the IV-IV direction of FIG. FIG. 5 is a bottom view of an oil pan according to an embodiment of the present invention. FIG. 6 is a sectional view taken along line in the VI-VI direction of FIG. FIG. 7 is a perspective view of an oil pan according to an embodiment of the present invention. FIG. 8 is a sectional view taken along line in the VI-VI direction of FIG. FIG. 9 is a view showing an oil pan according to an embodiment of the present invention, and is a top view of an oil pan provided with a second oil strainer portion having another shape. FIG. 10 is a cross-sectional view taken along the line XX of FIG.

The oil pan according to the embodiment of the present invention is provided in an internal combustion engine installed in a vehicle so as to have a cylinder block to which a transmission is connected and the rotation center axis of the crank shaft faces the width direction of the vehicle. The oil pan is connected to the lower part of the cylinder block and the transmission, and the depth of the first oil pan portion and the depth of the first oil pan portion is deeper than that of the first oil pan portion. It has a second oil pan portion having a bottom wall located below the bottom wall, and a curved portion that curves from the bottom wall of the first oil pan portion toward the bottom wall of the second oil pan portion. An oil strainer portion is formed integrally with the first oil pan portion, and the oil strainer portion is the center of rotation of the crank shaft from the side wall of the first oil pan portion to the bottom wall of the first oil pan portion. It extends in the axial direction.
As a result, the rigidity of the oil pan can be increased and the deformation of the oil pan can be suppressed.

Hereinafter, examples of the oil pan according to the present invention will be described with reference to the drawings.
1 to 10 are views showing an oil pan according to an embodiment of the present invention. In FIGS. 1 to 10, the top, bottom, front, back, left, and right are the directions seen from the driver in the vehicle.

First, the configuration will be described.
In FIG. 1, the vehicle 1 includes an engine 2 as an internal combustion engine. In FIG. 2, the engine 2 has a cylinder block 3, a cylinder head 4 connected to the upper part of the cylinder block 3, and an oil pan 5 connected to the lower part of the cylinder block 3.

A cylinder (not shown) is formed in the cylinder block 3, and a piston (not shown) is provided in the cylinder so as to be reciprocating. A crankshaft (not shown) is rotatably provided in the cylinder block 3, and the reciprocating motion of the piston is converted into the rotational motion of the crankshaft. FIG. 2 shows the rotation center axis 3a of the crankshaft.

The cylinder head 4 is provided with an intake / exhaust camshaft (not shown) and an intake / exhaust valve (not shown) for opening and closing an intake / exhaust port (not shown). The cylinder head 4 introduces intake air into the cylinder through the intake port and exhausts the air from the cylinder. Exhaust gas is discharged through the port. Oil for lubricating a lubricated portion such as a crankshaft or a piston is stored in the oil pan 5.

The engine 2 is installed so that the rotation center axis 3a of the crankshaft faces the width direction of the vehicle 1 (hereinafter, simply referred to as the vehicle width direction), and the vehicle 1 of the present embodiment has a transverse engine. The vehicle width direction is the left-right direction of the vehicle 1.

In FIGS. 1 and 2, a transmission 6 is connected to the engine 2, and the transmission 6 shifts and outputs the rotation speed of the engine 2. The transmission 6 is installed on the side of the engine 2 in the vehicle width direction, and the oil pan 5 is connected to the lower portion of the cylinder block 3 and the transmission 6.

In FIG. 1, the power transmitted from the engine 2 to the transmission 6 is differentially rotated from a differential device (not shown) provided in the transmission 6 to the left and right drive wheels 9L and 9R via the left and right drive shafts 8L and 8R. Communicated as possible. The engine 2 and the transmission 6 of this embodiment form a power unit that generates power.

In FIG. 2, an exhaust pipe 7 is attached to the cylinder head 4, and the exhaust pipe 7 discharges the exhaust gas discharged from the engine 2 to the outside through the exhaust port. The exhaust pipe 7 passes from the cylinder head 4 in front of the cylinder block 3 and extends from below the oil pan 5 to the rear of the engine 2 (see FIG. 1).

The oil pan 5 includes a first oil pan portion 31 and a second oil pan portion 32 having bottom walls 31A and 32A having different heights, and the first oil pan portion 31 is connected to the transmission 6. It is located to the left of the second oil pan portion 32 so as to be.

In FIG. 3, the first oil pan portion 31 is configured to include a bottom wall 31A, a front wall 31B, a side wall 31C, and a rear wall 31D, and the side wall 31C is connected to the transmission 6 by a bolt (not shown). There is.

The second oil pan portion 32 includes a bottom wall 32A, a front wall 32B, a side wall 32C, and a rear wall 32D. In FIG. 4, the bottom wall 32A is located below the bottom wall 31A, and the second oil pan portion 32 is formed so as to be deeper than the first oil pan portion 31. ..

The bottom walls 31A and 32A, the front walls 31B and 32B, the side walls 31C and 32C, and the rear walls 31D and 32D are integrally provided. The bottom walls 31A and 32A form the bottom wall of the oil pan 5, and the front walls 31B and 32B form the front wall of the oil pan 5. The side walls 31C and 32C form the side wall of the oil pan 5, and the rear walls 31D and 32D form the rear wall of the oil pan 5.

In the oil pan 5, oil is stored in a space surrounded by bottom walls 31A and 32A, front walls 31B and 32B, side walls 31C and 32C, and rear walls 31D and 32D. In FIG. 4, the oil pan 5 has a curved portion 33.

The curved portion 33 is curved from the bottom wall 31A of the first oil pan portion 31 toward the bottom wall 32A of the second oil pan portion 32. Here, the curved portion 33 may extend from the bottom wall 31A of the first oil pan portion 31 to the bottom wall 32A of the second oil pan portion 32.

In FIGS. 4 and 6, the exhaust pipe 7 passes below the first oil pan portion 31 so as to face the curved portion 33 in the vehicle width direction. In FIG. 6, the bottom wall 31A and the curved portion 33, which are the reference planes of the first oil pan portion 31, are shown by broken lines.

In the oil pan 5 of this embodiment, the curved portion 33 may be formed between the bottom wall 31A of the first oil pan portion 31 and the bottom wall 32A of the second oil pan portion 32. FIG. 3 shows a range in which the first oil pan portion 31, the second oil pan portion 32, and the curved portion 33 are formed.

In FIGS. 3 and 4, a first oil strainer portion 34 is formed in the first oil pan portion 31. The first oil strainer portion 34 extends from the side wall 31C of the first oil pan portion 31 along the bottom wall 31A in the direction of the rotation center axis 3a of the crankshaft, and is integrally with the first oil pan portion 31. It is formed. An oil passage 34a through which oil flows is formed inside the first oil strainer portion 34. The side wall 31C of this embodiment constitutes the side wall of the first oil pan portion of the present invention.

The second oil pan portion 32 is provided with a second oil strainer portion 35. The second oil strainer portion 35 extends from the end portion located to the right of the first oil strainer portion 34 toward the bottom wall 32A of the second oil pan portion 32 along the curved portion 33. An oil passage 35a through which oil flows is formed inside the second oil strainer portion 35, and the oil passage 35a communicates with the oil passage 34a.

A foreign matter trapping portion (not shown) is provided at the end of the second oil strainer portion 35 facing the bottom wall 32A of the second oil pan portion 32. The tip portion located on the left side of the first oil strainer portion 34 is connected to the oil pump 10 (see FIG. 2) through an oil pipe (not shown), and the oil pump 10 is connected to an oil filter (not shown).

The oil pump 10 may be an electric oil pump driven by a motor (not shown), or a mechanical oil pump in which the power of the crankshaft is transmitted to a timing belt (not shown). When the oil pump 10 is rotationally driven, the oil in the oil pan 5 is sucked up from the end portion of the second oil strainer portion 35.

The oil sucked up by the second oil strainer section 35 flows through the oil passage 35a after the foreign matter is removed from the oil by the foreign matter catching section, and then flows through the oil passage 34a of the first oil strainer section 34.

The oil flowing through the oil passage 34a is sucked up by the oil pump 10, and the sucked up oil is introduced into the oil filter to be purified and then supplied to the lubricated portion of the engine 2. As a result, the lubricated portion is lubricated by the purified oil.

A boss portion 31E is formed at the end of the first oil strainer portion 34, and the tip portion of the second oil strainer portion 35 is fitted to the boss portion 31E. The boss portion 31E is formed at a position connected to the curved portion 33 from the bottom wall 31A of the first oil pan portion 31.

In FIG. 3, a flange 35A is formed at the tip of the first oil strainer portion 34. A screw groove 31e to which the bolt 38 is fastened is formed in the boss portion 31E, and the flange 35A is fixed to the boss portion 31E by the bolt 38. As a result, the tip of the second oil strainer portion 35 is fastened to the boss portion 31E. The thread groove 31e of this embodiment constitutes a fastening portion of the present invention.

The boss portion 31E has a larger dimension L2 in the direction orthogonal to the axial direction of the first oil strainer portion 34 than the dimension L1 in the axial direction of the first oil strainer portion 34 (the same direction as the rotation center axis 3a). It is formed in a shape.

In FIGS. 5 and 6, a first bulging portion 31F is formed on the bottom wall 31A of the first oil pan portion 31, and the first bulging portion 31F is formed on the first oil strainer portion 34. On the other hand, it is formed on the bottom wall 31A of the first oil pan portion 31 on the front side, that is, on the front side with respect to the central axis in the extending direction of the first oil strainer portion 34.

In FIG. 6, the first bulging portion 31F bulges upward from the bottom wall 31A of the first oil pan portion 31. In FIG. 7, the first bulging portion 31F is inclined downward from the front wall 31B of the first oil pan portion 31 toward the rear, and the rear end portion 31f in the inclined direction is the first oil strainer portion. It is connected to 34 (see FIGS. 5 and 8). The rear end portion 31f of the present embodiment constitutes the rear end portion of the first bulging portion of the present invention.

In FIG. 5, the distance L3 in the vehicle width direction of the first bulging portion 31F is narrowed from the front wall 31B of the first oil pan portion 31 toward the rear first oil strainer portion 34. That is, the first bulging portion 31F is formed so that the distance L3 in the vehicle width direction from the front wall 31B to the rear side is narrower than the distance L4 in the vehicle width direction on the front wall 31B side of the first oil pan portion 31. Has been done.

In FIG. 6, the exhaust pipe 7 is installed below the first oil pan portion 31 so as to face the curved portion 33 in the width direction of the vehicle 1 and pass below the first bulging portion 31F. ing. In FIGS. 5 and 7, an inclined surface 32t is formed on the front wall 32B of the second oil pan portion 32, and the inclined surface 32t is in the vehicle width direction of the front wall 32B of the second oil pan portion 32. It is inclined rearward from the right end portion 32b toward the curved portion 33. The right end portion 32b of the present embodiment constitutes the widthwise end portion of the inclined portion of the present invention.

In FIG. 7, a second bulging portion 32F is formed in the second oil pan portion 32, and the second bulging portion 32F has the first bulging portion 31F and the inclined surface 32t in the vehicle width direction. It is formed between and.

The second bulging portion 32F bulges upward from the bottom wall 32A of the second oil pan portion 32 so as to extend from the upper portion 32u of the front wall 32B of the second oil pan portion 32 toward the curved portion 33. (See Fig. 6). The first bulging portion 31F and the second bulging portion 32F of the present embodiment constitute the bulging portion of the present invention.

Next, the action will be described.
While the engine 2 is in operation, the transmission 6 vibrates in the vertical direction X and the front-rear direction Y due to the vibration of the engine 2 and the vibration of the vehicle 1 (see FIG. 1). Since the oil pan 5 has a second oil pan portion 32 having a depth deeper than that of the first oil pan portion 31, the rigidity of the second oil pan portion 32 is higher than that of the first oil pan portion 31. Low. Further, in the oil pan 5, the first oil pan portion 31 is connected to the transmission 6.
As a result, when the vibration of the transmission 6 is transmitted to the oil pan 5, the oil pan 5 tries to deform in the front-rear direction R (see FIG. 2) of the vehicle 1 starting from the curved portion 33.

The oil pan 5 of this embodiment has a first oil pan portion 31 connected to the transmission 6 and a bottom of the first oil pan portion 31 so as to be deeper than the first oil pan portion 31. The second oil pan portion 32 having the bottom wall 32A located below the wall 31A and the bottom wall 31A of the first oil pan portion 31 are curved toward the bottom wall 32A of the second oil pan portion 32. It has a curved portion 33.

The first oil pan portion 31 has a first oil pan portion 31 extending from the side wall 31C of the first oil pan portion 31 along the bottom wall 31A of the first oil pan portion 31 in the direction of the rotation center axis 3a of the crankshaft. A first oil strainer portion 34 formed integrally with the oil pan portion 31 of the above is formed.

As a result, the rigidity of the first oil pan portion 31 can be increased by the first oil strainer portion 34, and the first oil pan portion 31 is deformed starting from the curved portion 33 due to the vibration of the transmission 6. Can be suppressed.

Therefore, the oil pan 5 is suppressed from being deformed as a whole, and the oil shakes greatly in the second oil pan portion 32 in which more oil is stored than in the first oil pan portion 31. Can be prevented.

As a result, it is possible to prevent the second oil strainer portion 35 from sucking air in the second oil pan portion 32, and it is possible to prevent air from being sucked into the oil pump 10.

Further, according to the oil pan 5 of the present embodiment, the second oil pan portion 32 extends from the end portion of the first oil strainer portion 34 toward the bottom wall 32A of the second oil pan portion 32. The oil strainer portion 35 of 2 is provided.

A boss portion 31E to which the tip end portion of the second oil strainer portion 35 fits is formed at the end portion of the first oil strainer portion 34, and the boss portion 31E is the bottom of the first oil pan portion 31. It is formed at a position connected to the curved portion 33 from the wall 31A.

As a result, the rigidity of the curved portion 33 can be increased by the boss portion 31E, and the deformation of the first oil pan portion 31 starting from the curved portion 33 due to the vibration of the transmission 6 can be more effectively suppressed. It is possible to prevent the oil pan 5 from being deformed more effectively.

Therefore, it is possible to more effectively prevent the second oil strainer portion 35 from sucking air in the second oil pan portion 32, and it is possible to more effectively prevent the air from being sucked into the oil pump 10.

Further, according to the oil pan 5 of the present embodiment, the boss portion 31E is in a direction orthogonal to the axial direction of the first oil strainer portion 34 with respect to the axial dimension L1 of the first oil strainer portion 34. The dimension L2 is formed in a large shape.
In addition to this, the boss portion 31E has a thread groove 31e to which the tip end portion of the second oil strainer portion 35 is fastened by the bolt 38.

As a result, the installation area of the boss portion 31E with respect to the curved portion 33 can be increased, and the thickness of the boss portion 31E in the direction of the thread groove 31e can be increased by the depth of the thread groove 31e. Therefore, the rigidity of the curved portion 33 can be increased more effectively, and the deformation of the first oil pan portion 31 starting from the curved portion 33 due to the vibration of the transmission 6 can be more effectively suppressed.

Further, according to the vehicle 1 of the present embodiment, the engine 2 passes through the cylinder head 4 provided on the upper part of the cylinder block 3 and the front of the cylinder block 3 from the cylinder head 4, and the engine 2 is passed from below the oil pan 5. It has an exhaust pipe 7 extending to the rear of the.

The exhaust pipe 7 passes below the first oil pan portion 31 so as to face the curved portion 33 in the width direction of the vehicle 1.
As a result, the temperature of the oil stored inside the oil pan 5 can be raised by the heat of the exhaust gas passing through the exhaust pipe 7. Therefore, in a state where the viscosity of the oil is high, such as when the engine 2 is cold started, the oil can be warmed up early by the heat of the exhaust gas, and the viscosity of the oil is suitable for lubrication of the lubricated portion. Can be made.

Further, as shown in FIG. 8, when the vehicle 1 is traveling, the traveling wind F flowing from the front of the vehicle 1 to the engine 2 is measured by the exhaust pipe 7 and the first oil pan portion 31 as shown by the traveling wind F3. Can be shed in between. As a result, in a state where the engine 2 is in a high temperature state and the viscosity of the oil is low (the oil becomes smooth), a heat insulating layer can be formed between the exhaust pipe 7 and the lower part of the oil pan 5 by the running wind F3.

Further, the oil pan 5 of this embodiment has a first bulging portion 31F on the bottom wall 31A of the first oil pan portion 31 on the front side with respect to the first oil strainer portion 34. The first bulging portion 31F bulges upward from the bottom wall 31A of the first oil pan portion 31, and the bottom wall 31A of the first bulging portion 31F is in front of the first oil pan portion 31. It is inclined downward from the wall 31B toward the rear, and the rear end portion 31f in the inclined direction is connected to the first oil strainer portion 34.

Further, the exhaust pipe 7 is installed below the first oil pan portion 31 so as to pass below the first bulging portion 31F.
As a result, as shown in FIGS. 5 and 8, the traveling wind F flowing from the front of the vehicle 1 to the engine 2 when the vehicle 1 is traveling is along the first bulging portion 31F as shown by the traveling wind F3. It can flow between the exhaust pipe 7 and the first oil pan portion 31.

Therefore, a heat insulating layer due to the traveling wind F3 can be easily formed between the exhaust pipe 7 and the first bulging portion 31F. Therefore, it is possible to prevent the oil inside the oil pan 5 from being excessively heated by the heat of the high-temperature exhaust gas flowing through the exhaust pipe 7, and the running wind F3 can cool the oil more effectively. As a result, it is possible to more effectively prevent the viscosity of the oil from decreasing, and the viscosity of the oil can be made suitable for lubrication of the lubricated portion.

Further, according to the oil pan 5 of the present embodiment, the first bulging portion 31F is in the vehicle width direction from the front wall 31B of the first oil pan portion 31 toward the rear first oil strainer portion 34. The interval L3 is narrowly formed.

As a result, as shown in FIG. 5, the flow velocity of the traveling wind F3 flowing along the interval L3 from the interval L4 of the first bulging portion 31F is increased by the interval L3 narrower than the interval L4, and the first bulging It is possible to easily pass the traveling wind F3 from the front to the rear of the vehicle 1 along the portion 31F.
Therefore, the oil inside the oil pan 5 can be cooled more effectively by the traveling wind having a high flow velocity, and the viscosity of the oil can be prevented from being lowered more effectively.

Further, according to the oil pan 5 of the present embodiment, an inclined surface 32t is formed on the front wall 32B of the second oil pan portion 32, and the inclined surface 32t is the front wall 32B of the second oil pan portion 32. It is inclined rearward from the right end portion 32b in the vehicle width direction toward the curved portion 33.

As a result, as shown in FIG. 5, the traveling wind F flowing from the front of the vehicle 1 to the engine 2 is smoothly guided to the first bulging portion 31F along the inclined surface 32t as shown in the traveling wind F1. Can be done. Therefore, the traveling wind F taken in from the front of the vehicle 1 can be easily flowed between the exhaust pipe 7 and the first oil pan portion 31 along the first bulging portion 31F.
As a result, it is possible to prevent the oil inside the oil pan 5 from being excessively heated by the heat of the high-temperature exhaust gas flowing through the exhaust pipe 7, and the oil can be cooled more effectively by the traveling wind F3.

Further, since the inclined surface 32t is inclined rearward from the right end portion 32b of the front wall 32B of the second oil pan portion 32 in the vehicle width direction toward the curved portion 33, the vehicle of the second oil pan portion 32 The cross-sectional coefficients in the width direction and the front-rear direction of the vehicle 1 can be reduced. Therefore, the rigidity of the second oil pan portion 32 can be improved, and the deformation of the oil pan 5 due to the vibration of the transmission 6 can be more effectively suppressed.

Further, the oil pan 5 of this embodiment has a second bulging portion 32F between the first bulging portion 31F and the inclined surface 32t in the vehicle width direction. The second bulging portion 32F bulges upward from the bottom wall 32A of the second oil pan portion 32 so as to extend from the upper portion 32u of the front wall 32B of the second oil pan portion 32 toward the curved portion 33. ing.

As a result, the traveling wind F flowing from the front of the vehicle 1 to the engine 2 is guided along the inclined surface 32t as shown in the traveling wind F1, and then by the second bulging portion 32F as shown in the traveling wind F2. It can be smoothly guided to the first bulging portion 31F (see FIGS. 5 and 7).

Further, as shown in FIG. 7, the traveling wind F taken in from the front of the vehicle 1 is transferred from the front wall 32B of the second oil pan portion 32 to the second bulging portion 32F as shown by the traveling wind F4. It can be smoothly guided to the curved portion 33 along the line.

Further, in the oil pan 5 of the present embodiment, as shown in FIGS. 9 and 10, a rib 35B is provided in the second oil strainer portion 35, and a boss portion 33A in which a screw groove is formed is provided in the curved portion 33. , The rib 35B may be fastened to the boss portion 33A by the bolt 43. The boss portion 31E of the present embodiment constitutes the first boss portion of the present invention, and the boss portion 33A constitutes the second boss portion of the present invention.

In this way, the curved portion 33 and the second oil strainer portion 35 can be connected, and the rigidity of the curved portion 33 can be increased more effectively. Therefore, it is possible to more effectively suppress the deformation of the first oil pan portion 31 starting from the curved portion 33 due to the vibration of the transmission 6.

In the oil pan 5 of this embodiment, the transmission 6 is connected to the first oil pan portion 31, but conversely, the transmission 6 is connected to the second oil pan portion 32. May be good.

Although the embodiments of the present invention have been disclosed, it is clear that some skilled in the art can make changes without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1 ... vehicle, 2 ... engine (internal combustion engine), 3 ... cylinder block, 3a ... rotation center axis (crankshaft rotation center axis), 4 ... cylinder head, 5 ... Oil pan, 6 ... transmission, 7 ... exhaust pipe, 31 ... first oil pan part, 31A ... bottom wall (bottom wall of first oil pan part), 31B ... Front wall (front wall of the first oil pan portion), 31C ... side wall (side wall of the first oil pan portion), 31E ... boss portion (first boss portion), 31e ... screw groove (Fastening part), 31F ... 1st bulging part (bulging part), 31f ... rear end part (rear end part of bulging part), 32 ... 2nd oil pan part, 32A ... bottom wall (bottom wall of the second oil pan), 32B ... front wall (front wall of the second oil pan), 32F ... second bulge (bulge) , 32b ... right end (width direction end of vehicle on slope), 32f ... bottom wall (bottom wall of second bulge), 32t ... slope, 32u ... top ( Upper part of the front wall of the second oil pan part), 33 ... curved part, 33A ... boss part (second boss part), 34 ... first oil strainer part, 35 ... 2 oil strainer part

Claims (8)

Has a cylinder block transmission is connected, and the central axis of rotation of the crankshaft is provided in an internal combustion engine installed in vehicles so as to face in the width direction of the vehicle, and the transmission and a lower portion of the cylinder block It is an oil pan that is connected to
The internal combustion engine has a cylinder head provided on the upper part of the cylinder block, and an exhaust pipe that passes from the cylinder head in front of the cylinder block and extends from below the oil pan to the rear of the internal combustion engine.
The oil pan has a first oil pan portion and a bottom wall located below the bottom wall of the first oil pan portion so as to be deeper than the first oil pan portion. It has a second oil pan portion and a curved portion that curves from the bottom wall of the first oil pan portion toward the bottom wall of the second oil pan portion.
An oil strainer portion is formed integrally with the first oil pan portion, and the oil strainer portion is a crank from the side wall of the first oil pan portion along the bottom wall of the first oil pan portion. It extends in the direction of the center of rotation of the shaft and
The oil pan has a bulging portion on the bottom wall of the first oil pan portion on the front side with respect to the oil strainer portion.
The bulging portion bulges upward from the bottom wall of the first oil pan portion.
The bottom wall of the bulging portion is inclined downward from the front wall of the first oil pan portion toward the rear, and the rear end portion in the inclined direction is connected to the oil strainer portion.
The oil pan is characterized in that the exhaust pipe faces the curved portion in the width direction of the vehicle and passes below the bulging portion of the first oil pan portion . The oil according to claim 1, wherein the bulging portion is formed so as to have a narrow distance in the width direction of the vehicle from the front wall of the first oil pan portion toward the rear oil strainer portion. Bread. An inclined surface is formed on the front wall of the second oil pan portion.
The oil pan according to claim 1 or 2, wherein the inclined surface is inclined rearward from the widthwise end portion of the front wall of the second oil pan portion toward the curved portion. .. When the oil strainer portion is used as the first oil strainer portion, it extends to the second oil pan portion from the end portion of the first oil strainer portion toward the bottom wall of the second oil pan portion. A second oil strainer is provided,
A boss portion into which the tip end portion of the second oil strainer portion fits is formed at the end portion of the first oil strainer portion.
The oil pan according to any one of claims 1 to 3, wherein the boss portion is formed at least at a position connected to the curved portion from the bottom wall of the first oil pan portion . When the bulging portion is used as the first bulging portion, the oil pan has a second bulging portion between the first bulging portion and the inclined surface in the width direction of the vehicle. ,
The second bulging portion bulges upward from the bottom wall of the second oil pan portion so as to extend from the upper part of the front wall of the second oil pan portion toward the curved portion. The oil pan according to claim 3 . The boss portion is formed in a shape in which the dimension in the direction orthogonal to the axial direction of the first oil strainer portion is larger than the dimension in the axial direction of the first oil strainer portion.
The oil pan according to claim 4 , wherein the boss portion has a fastening portion to which the tip end portion of the second oil strainer portion is fastened . The oil pan according to claim 6 , wherein the second oil strainer portion extends along the curved portion . 4. The fourth or claim , wherein when the boss portion is the first boss portion, a second boss portion to which the second oil strainer portion is fastened is formed on the curved portion. The oil pan according to 6 .