JP6809252B2 - 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.

Jikken Sho 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 is provided in an internal combustion engine having a cylinder block and installed in the vehicle so that the rotation center axis of the crank shaft faces the front-rear direction of the vehicle, and is provided in the lower part of the cylinder block and behind the internal combustion engine. An oil pan connected to a transmission provided, the first oil pan portion and the first oil pan located behind the first oil pan portion and connected to the transmission. The second oil pan portion having a bottom wall located below the bottom wall of the first oil pan portion so as to be deeper than the portion, and the bottom wall of the first oil pan portion. It has a curved portion that curves toward the bottom wall of the second oil pan portion, and the first oil pan portion has a curved portion that curves from the front wall of the first oil pan portion to the bottom of the first oil pan portion. A first oil strainer portion extending along the wall in the direction of the rotation center axis of the crank shaft and integrally formed with the first oil pan portion is formed, and the second oil pan portion has the said A second oil strainer portion extending from the rear end portion of the first oil strainer portion toward the bottom wall of the second oil pan portion is provided, and the rear end portion of the first oil strainer portion is provided. wherein and the tip portion of the second oil strainer portion is a boss portion fitted is formed, the boss portion is formed from at least the first bottom wall of the oil pan portion at a position leading to the curved portion 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. Is characterized by having a fastening portion to which the tip end portion of the second oil strainer portion is fastened .

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 plan view of a vehicle provided with an oil pan according to an embodiment of the present invention. FIG. 2 is a bottom view of a vehicle provided with an oil pan according to an embodiment of the present invention. FIG. 3 is a side view of the power unit as viewed from the direction of arrow III in FIG. FIG. 4 is a front view of an engine provided with an oil pan according to an embodiment of the present invention. FIG. 5 is a top 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 cross-sectional view taken along the line VII-VII of FIG. FIG. 8 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. 9 is a cross-sectional view taken along the line in the IX-IX direction 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 and the rotation center axis of the crank shaft faces the front-rear direction of the vehicle, and is provided in the lower part of the cylinder block. And an oil pan connected to a transmission provided behind the internal combustion engine, which is located behind the first oil pan portion and the first oil pan portion and is connected to the transmission. From the second oil pan portion having a bottom wall located below the bottom wall of the first oil pan portion so as to be deeper than the oil pan portion of the first oil pan portion and from the bottom wall of the first oil pan portion. It has a curved portion that curves toward the bottom wall of the second oil pan portion, and the first oil pan portion has a curved portion that curves from the front wall of the first oil pan portion to the bottom wall of the first oil pan portion. A first oil strainer portion extending in the direction of the rotation center axis of the crank shaft and integrally formed with the first oil pan portion is formed, and the second oil pan portion is formed with the first oil strainer portion. A second oil strainer portion extending from the rear end portion toward the bottom wall of the second oil pan portion is provided, and the tip portion of the second oil strainer is provided at the rear end portion of the first oil strainer portion. A boss portion to be fitted is formed, and the boss portion is formed at a position connected to at least a curved portion from the bottom wall of the first oil pan portion.
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 9 are views showing an oil pan according to an embodiment of the present invention. In FIGS. 1 to 9, the top, bottom, front, back, left, and right directions are the directions seen by the driver in the vehicle.

First, the configuration will be described.
In FIGS. 1 and 2, the vehicle 1 includes an engine 2 as an internal combustion engine. In FIGS. 3 and 4, 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 3A (see FIG. 4) is rotatably provided in the cylinder block 3, and the reciprocating motion of the piston is converted into a rotational motion of the crankshaft 3A. FIG. 3 shows the rotation center axis 3a of the crankshaft 3A.

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 3A faces the front-rear direction of the vehicle 1 (see FIG. 3), and the vehicle 1 of this embodiment has a longitudinal engine.
In FIGS. 1 and 2, a transmission 6 is connected to the engine 2, and the transmission 6 shifts and outputs the rotational speed of the crankshaft 3A. The transmission 6 is installed behind the engine 2, and the oil pan 5 is connected to the lower part of the cylinder block 3 and the transmission 6 (see FIG. 3).

The front end portion of the first front propeller shaft 7 is connected to the transmission 6, and the first front propeller shaft 7 extends from the transmission 6 to the rear in the front-rear direction of the vehicle 1. A transfer device 8 is installed behind the transmission 6, and the rear end portion of the first front propeller shaft 7 is connected to the transfer device 8. As a result, the power of the transmission 6 is transmitted to the transfer device 8 via the first front propeller shaft 7.

The rear end of the second front propeller shaft 9 and the front end of the rear propeller shaft 10 are connected to the transfer device 8. The second front propeller shaft 9 extends forward from the transfer device 8 in the front-rear direction of the vehicle 1 toward the side in the vehicle width direction of the engine 2.

The front end of the second front propeller shaft 9 is connected to the front differential device 11. The front differential device 11 transmits the power of the second front propeller shaft 9 to the front wheels 13L and 13R via the front left and right drive shafts 12L and 12R so as to be differentially rotatable.

The rear end of the rear propeller shaft 10 is connected to a rear differential (not shown). The rear differential device transmits the power of the rear propeller shaft 10 to the rear wheels (not shown) via the left and right drive shafts on the rear side (not shown) so as to be differentially rotatable.

The transfer device 8 switches the transmission path so that the power transmitted from the first front propeller shaft 7 is transmitted to one or both of the second front propeller shaft 9 and the rear propeller shaft 10.

As a result, the vehicle 1 is subjected to part-time 4WD in which the vehicle 1 is switched to two-wheel drive or four-wheel drive. The transfer device 8 may be driven so as to be a power transmission path for driving the vehicle 1 with four wheels at all times, that is, to be full-time 4WD.

The first front propeller shaft 7 of the present embodiment constitutes the first propeller shaft of the present invention, and the second front propeller shaft 9 constitutes the second propeller shaft of the present invention. The front differential device 11 constitutes the differential device of the present invention.

In FIGS. 5 and 6, 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 second oil pan portion 32. Is located behind the first oil pan portion 31 so as to be connected to the transmission 6. The first oil pan portion 31 includes a bottom wall 31A, a front wall 31B, and side walls 31C and 31D.

The second oil pan portion 32 includes a bottom wall 32A, a rear wall 32B, and side walls 32C and 32D. 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 rear wall 32B is connected to the transmission 6 by a bolt 38 (see FIG. 3).

The side walls 31C and 31D are provided integrally with the side walls 32C and 32D, and the side walls 31C, 31D, 32 and 32D form the side wall of the oil pan 5. Oil is stored in the oil pan 5 in a space surrounded by the bottom walls 31A and 32A, the front wall 31B, the rear wall 32B and the side walls 31C, 31D, 32 and 32D.

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 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. 5 shows a range in which the first oil pan portion 31, the second oil pan portion 32, and the curved portion 33 are formed.

A first oil strainer portion 34 is formed in the first oil pan portion 31. The first oil strainer portion 34 extends from the front wall 31B 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 integrated with the first oil pan portion 31. Is formed in. An oil passage 34a through which oil flows is formed inside the first oil strainer portion 34.

The second oil pan portion 32 is provided with a second oil strainer portion 35. The second oil strainer portion 35 extends from the rear end portion 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 catching portion (not shown) is provided at the rear end portion of the second oil strainer portion 35 facing the bottom wall 32A of the second oil pan portion 32. The tip of the first oil strainer portion 34 is connected to an oil filter 41 (see FIG. 4), and the oil filter 41 is connected to an oil pump 42 (see FIG. 4) through an oil pipe (not shown).

The oil pump 42 is rotationally driven by the crankshaft 3A. When the oil pump 42 is rotationally driven, the oil in the oil pan 5 is sucked up from the rear end 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 35a is introduced into the oil filter 41, purified by the oil filter 41, and then supplied from the oil pump 42 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 rear end portion 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. 5, 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.

A bulging portion 31F is formed on the bottom wall 31A of the first oil pan portion 31. The bulging portion 31F bulges upward from the bottom wall 31A (see FIG. 7). The bulging portion 31F bulges upward from the bottom wall 31A on the side where the front differential device 11 is installed with respect to the first oil strainer portion 34.

The bulging portion 31F connects the side wall 31C of the first oil pan portion 31 facing the front differential device 11, the first oil strainer portion 34, the boss portion 31E, and the curved portion 33.

The engine 2, the transmission 6, the first front propeller shaft 7, the transfer device 8, the second front propeller shaft 9, the rear propeller shaft 10, the front differential device 11, and the drive shafts 12L and 12R of this embodiment are engines. It constitutes a power train that transmits the power generated in 2 to the front wheels 13L and 13R. Further, the engine 2 and the transmission 6 of the present embodiment constitute a power unit that generates power.

Next, the action will be described.
While the engine 2 is in operation, the transmission 6 vibrates in the vertical direction X and the horizontal direction Y due to the vibration of the engine 2 and the vibration of the vehicle 1 (see FIG. 4). 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 second oil pan portion 32 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. 3) of the vehicle 1 starting from the curved portion 33.

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

The first oil pan portion 31 extends from the front wall 31B 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 3A. A first oil strainer portion 34 formed integrally with the first oil pan portion 31 is formed.
The second oil pan portion 32 is provided with a second oil strainer portion 35 extending from the rear end portion of the first oil strainer portion 34 toward the bottom wall 32A of the second oil pan portion 32.

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

As a result, the rigidity of the first oil pan portion 31 can be increased by the first oil strainer portion 34, and the rigidity of the curved portion 33 can be increased by the boss portion 31E. Therefore, it is possible to prevent the second oil pan portion 32 from being deformed starting from the curved portion 33 due to the vibration of the transmission 6.

Since it is possible to prevent the second oil pan portion 32 having a deep depth from being deformed in this way, the oil is stored in the second oil pan portion 32 in which more oil is stored than in the first oil pan portion 31. It is possible to prevent it from shaking greatly.
Therefore, 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 the oil pump 42 from sucking air.

Further, since the second oil pan portion 32 is located behind the first oil pan portion 31, when the traveling wind B collides with the oil pan 5 from the front of the vehicle 1, the traveling wind B becomes the first. After colliding with the curved portion 33 along the bottom wall 31A of the oil pan portion 31 of the above, the oil flows backward from the curved portion 33 along the bottom wall 32A (see FIG. 3).

As a result, the oil stored in the oil pan 5 can be cooled by the running wind, and the oil can be kept at an appropriate temperature. Therefore, the viscosity of the oil can be maintained appropriately, the lubricity of the lubricated portion of the engine 2 can be improved, and the engine parts can be prevented from being deteriorated at an early stage.

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 second oil pan portion 32 starting from the curved portion 33 due to the vibration of the transmission 6 can be more effectively suppressed.

On the other hand, the power train of this embodiment is installed behind the transmission 6 and is connected to the transmission 6 via the first front propeller shaft 7 and the transfer device 8 and the side of the engine 2 from the transfer device 8. It is provided with a second front propeller shaft 9 extending in the front-rear direction of the vehicle 1 toward the vehicle 1.

Further, the power train is provided at the front end portion of the second front propeller shaft 9, and includes a front differential device 11 that transmits the power of the second front propeller shaft 9 to the front wheels 13L and 13R so as to be differentially rotatable. ..

As a result, when the transmission 6 vibrates in the vertical and horizontal directions, the first front propeller shaft 7 vibrates in the front-rear direction of the vehicle 1, and this vibration vibrates in the front-rear direction via the transfer device 8 and the second front propeller shaft 9. It is transmitted to the device 11.

Since the second front propeller shaft 9 and the front differential device 11 are installed so as to be offset sideways with respect to the oil pan 5, the oil pan 5 is provided on the second front propeller shaft 9 and the front differential device 11. It is easily deformed to the side where it is installed (X1 direction in FIG. 1).

According to the oil pan 5 of this embodiment, the bulging portion 31F is formed on the bottom wall 31A of the first oil pan portion 31. The bulging portion 31F bulges upward from the bottom wall 31A on the side where the front differential device 11 is installed with respect to the first oil strainer portion 34.

In addition to this, the bulging portion 31F connects the side wall 31C of the first oil pan portion 31 facing the front differential device 11, the first oil strainer portion 34, the boss portion 31E, and the curved portion 33. doing.

As a result, the rigidity of the first oil pan portion 31 can be increased, and the deformation of the oil pan 5 toward the front differential device 11 can be easily suppressed. Therefore, it is possible to more effectively suppress the deformation of the second oil pan portion 32 starting from the curved portion 33 due to the vibration of the transmission 6.

Further, in the oil pan 5 of the present embodiment, as shown in FIGS. 8 and 9, 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 second oil pan portion 32 starting from the curved portion 33 due to the vibration of the transmission 6.

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 ... crankshaft, 3a ... rotation center shaft, 5 ... oil pan, 6 ... shift Machine, 7 ... 1st front propeller shaft (1st propeller shaft), 8 ... transfer device, 9 ... 2nd front propeller shaft (front propeller shaft), 11 ... front differential device (Differential device), 31 ... 1st oil pan part, 31A, 32A ... bottom wall, 31B ... front wall, 31 ... side wall, 31E ... boss part (1st boss part) ), 31F ... bulging part, 31e ... screw groove (fastening part), 32 ... second oil pan part, 33 ... curved part, 33A ... boss part (second boss) Part), 34 ... 1st oil strainer part, 35 ... 2nd oil strainer part

Claims (3)

A transmission that has a cylinder block and is provided in an internal combustion engine installed in the vehicle so that the central axis of rotation of the crankshaft faces the front-rear direction of the vehicle, and is provided in the lower part of the cylinder block and behind the internal combustion engine. An oil pan that is connected to the machine
The first oil pan is located behind the first oil pan and is connected to the transmission so as to be deeper than the first oil pan. A second oil pan portion having a bottom wall located below the bottom wall of the 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. And have
The first oil pan extends from the front wall of the first oil pan along the bottom wall of the first oil pan in the direction of the rotation center axis of the crankshaft to the first oil pan. A first oil strainer portion formed integrally with the portion is formed.
The second oil pan portion is provided with a second oil strainer portion extending from the rear end portion of the first oil strainer portion toward the bottom wall of the second oil pan portion.
A boss portion into which the tip end portion of the second oil strainer portion is fitted is formed at the rear end portion of the first oil strainer portion.
The boss portion is formed at a position connected to at least the curved portion from the bottom wall of the first oil pan portion .
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 boss portion is an oil pan having a fastening portion to which the tip end portion of the second oil strainer portion is fastened . The vehicle is installed behind the transmission and is connected to the transmission via a first propeller shaft.
A second propeller shaft extending in the front-rear direction of the vehicle from the transfer device toward the side of the internal combustion engine.
It is provided at the front end of the second propeller shaft and is provided with a differential device that transmits the power of the second propeller shaft to the left and right front wheels in a differentially rotatable manner.
The oil pan has at least a bulging portion that bulges upward from the bottom wall on the side where the second propeller shaft or the differential device is installed with respect to the first oil strainer portion.
The bulging portion connects the side wall of the oil pan facing the second propeller shaft or the differential device, the first oil strainer portion, the boss portion, and the curved portion. The oil pan according to claim 1. The second oil strainer portion extends along the curved portion and extends.
Claim 1 or claim , wherein when the boss portion is used as 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 2.