JP2018119425A - Oil pan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pan enabling deformation to be suppressed by enhancing rigidity.SOLUTION: A first oil strainer section 34 is formed in a shallow first oil pan section 31 integrally with the first oil pan section 31 so as to extend from a front wall 31B of the first oil pan section 31 along a bottom wall 31A of the first oil pan section 31 to a direction of a rotation center axis 3a of a crank shaft 3A. A second oil strainer section 35 extending from a rear end of the first oil strainer section 34 toward a bottom wall 32A of a second oil pan section 32 is provided in the deep second oil pan section 32. A boss section 31E to which a tip of the second oil strainer section 35 is fitted is formed at the rear end of the first oil strainer section 34, and the boss section 31E is located at a position leading from the bottom wall 31A of the first oil pan section 31 to a curved section 33.SELECTED DRAWING: Figure 6

Description

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

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

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

Japanese Utility Model 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. Thereby, the vibration of the transmission is transmitted to the oil pan.

  In a 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 oil pan portion 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 side bottom surface (hereinafter referred to as the lower side oil pan portion) is low.

  For this reason, when the transmission is connected to the higher oil pan portion, the lower oil pan portion is likely to be deformed starting from the curved portion due to the vibration of the transmission. Since the oil strainer is integrally provided in the lower oil pan portion, when the lower oil pan portion is deformed, the oil stored in the lower oil pan portion is greatly shaken. For this reason, there exists a possibility that an oil strainer may inhale air and an oil pump may inhale this air.

  The present invention has been made paying attention to the above-described 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 that is installed in the vehicle so as to have a cylinder block and that a rotation center axis of a crankshaft is directed in the front-rear direction of the vehicle, and is provided below the cylinder block and behind the internal combustion engine. An oil pan connected to a provided transmission, wherein the oil pan is connected to the transmission at a position behind the first oil pan portion and the first oil pan portion. A second oil pan portion having a bottom wall positioned 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 from the bottom wall A curved portion that curves toward the bottom wall of the second oil pan portion, and the first oil pan portion has a bottom from the front wall of the first oil pan portion to the bottom of the first oil pan portion. Axis of rotation center of the crankshaft along the wall A first oil strainer portion formed integrally with the first oil pan portion is formed, and the second oil pan portion is formed from the rear end portion of the first oil strainer portion. A second oil strainer portion extending toward the bottom wall of the second oil pan portion is provided, and a tip end portion of the second oil strainer is fitted to a rear end portion of the first oil strainer portion. The boss part is formed, and the boss part is formed at a position connecting at least from the bottom wall of the first oil pan part to the curved part.

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

FIG. 1 is a plan view of a vehicle including an oil pan according to an embodiment of the present invention. FIG. 2 is a bottom view of a vehicle including an oil pan according to an embodiment of the present invention. FIG. 3 is a side view of the power unit viewed from the direction of arrow III in FIG. FIG. 4 is a front view of an engine including 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 cross-sectional view taken along arrow VI-VI in FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. FIG. 8 is a view illustrating an oil pan according to an embodiment of the present invention, and is a top view of the oil pan including a second oil strainer portion having another shape. 9 is a cross-sectional view taken along arrow IX-IX in FIG.

An oil pan according to an embodiment of the present invention includes a cylinder block, and is provided in an internal combustion engine installed in a vehicle so that a rotation center axis of a crankshaft is directed in the front-rear direction of the vehicle. And an oil pan connected to a transmission provided at the rear of the internal combustion engine, the oil pan being connected to the first oil pan portion and the transmission located at the rear of 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 so as to be deeper than the oil pan portion, and a bottom wall of the first oil pan portion. A curved portion that curves toward the bottom wall of the second oil pan portion, and the first oil pan portion extends along the bottom wall of the first oil pan portion from the front wall of the first oil pan portion. Extending in the direction of the center axis of rotation of the crankshaft, A first oil strainer portion formed integrally with the pan portion is formed, and the second oil pan portion is formed from the rear end portion of the first oil strainer portion toward the bottom wall of the second oil pan portion. A second oil strainer portion is provided, and a boss portion is formed at the rear end portion of the first oil strainer portion to which the tip portion of the second oil strainer is fitted. At least the first oil pan portion is formed at a position connecting to the curved portion from the bottom wall.
Thereby, the rigidity of an oil pan can be improved and a deformation | transformation of an oil pan can be suppressed.

Embodiments of an oil pan according to the present invention will be described below with reference to the drawings.
1 to 9 are views showing an oil pan according to an embodiment of the present invention. In FIG. 1 to FIG. 9, up, down, front, back, left, and right are directions as viewed from the driver on the vehicle.

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

  The cylinder head 4 is provided with an intake / exhaust valve (not shown) for opening / closing an intake / exhaust camshaft (not shown) and an intake / exhaust port (not shown). Exhaust gas is exhausted through the port. The oil pan 5 stores oil for lubricating lubricating parts such as a crankshaft and a piston.

The engine 2 is installed such that the rotation center shaft 3a of the crankshaft 3A is directed in the front-rear direction of the vehicle 1 (see FIG. 3), and the vehicle 1 of the present embodiment has a vertical engine.
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).

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

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

  The front end portion 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 through the front left and right drive shafts 12L and 12R so as to be differentially rotatable.

  The rear end portion of the rear propeller shaft 10 is connected to a rear differential device (not shown). The rear differential device transmits the power of the rear propeller shaft 10 to a rear wheel (not shown) through a rear left and right drive shafts (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 which is switched to two-wheel drive or four-wheel drive. Note that the transfer device 8 may be driven so as to be a power transmission path that always drives the vehicle 1 with four wheels, that is, 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 a differential device of the present invention.

  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 provided. Is positioned behind the first oil pan 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 32 </ b> A is located below the bottom wall 31 </ b> A, and the second oil pan portion 32 is formed 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 constitute the side wall of the oil pan 5. In the oil pan 5, oil is stored in a space surrounded by the bottom walls 31A, 32A, the front wall 31B, the rear wall 32B, and the side walls 31C, 31D, 32, 32D.

  The oil pan 5 has a curved portion 33. The curved portion 33 is curved from the bottom wall 31 </ b> A of the first oil pan portion 31 toward the bottom wall 32 </ b> A of the second oil pan portion 32. Here, the curved portion 33 may extend from the bottom wall 31 </ b> A of the first oil pan portion 31 to the bottom wall 32 </ b> A of the second oil pan portion 32.

  In the oil pan 5 of the present embodiment, the curved portion 33 only needs to 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. In FIG. 5, the range in which the 1st oil pan part 31, the 2nd oil pan part 32, and the curved part 33 are formed is shown.

  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. An oil passage 34 a 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 32 </ b> A 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 front end of the first oil strainer 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 driven to rotate, the oil in the oil pan 5 is sucked up from the rear end portion of the second oil strainer portion 35.

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

  Oil flowing through the oil passage 35 a is introduced into the oil filter 41, purified by the oil filter 41, and then supplied from the oil pump 42 to the lubrication part of the engine 2. As a result, the lubricated part 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 end portion of the second oil strainer portion 35 is fitted to the boss portion 31E. The boss portion 31 </ b> E is formed at a position connecting the curved wall 33 from the bottom wall 31 </ b> A of the first oil pan portion 31.

  In FIG. 5, a flange 35 </ b> A is formed at the tip of the first oil strainer 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. Thereby, the front-end | tip part of the 2nd oil strainer part 35 is fastened by the boss | hub part 31E. The thread groove 31e of the present embodiment constitutes a fastening portion of the present invention.

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

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

  The bulging portion 31 </ b> F connects the side wall 31 </ b> C of the first oil pan portion 31 facing the front differential device 11, the first oil strainer portion 34, the boss portion 31 </ b> E, and the bending 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 the present embodiment are the engine 2 constitutes a power train that transmits the power generated at 2 to the front wheels 13L, 13R. Further, the engine 2 and the transmission 6 of this embodiment constitute a power unit that generates power.

Next, the operation will be described.
While the engine 2 is operating, the transmission 6 vibrates in the vertical direction X and the horizontal direction Y due to vibrations of the engine 2 and the vehicle 1 (see FIG. 4). Since the oil pan 5 has the second oil pan portion 32 that is deeper than 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, the oil pan 5 has a second oil pan portion 32 connected to the transmission 6.

  Thereby, when the vibration of the transmission 6 is transmitted to the oil pan 5, the oil pan 5 tends to deform in the front-rear direction R (see FIG. 3) of the vehicle 1 with the curved portion 33 as a starting point.

  The oil pan 5 according to this embodiment is connected to the first oil pan unit 31 and the transmission 6 at the rear of the first oil pan unit 31 and has a depth deeper than that of the first oil pan unit 31. A second oil pan portion 32 having a bottom wall 32A positioned below the bottom wall 31A of the first oil pan portion 31 so as to be deep, and a second wall from the bottom wall 31A of the first oil pan portion 31 to the second And a curved portion 33 that curves toward the bottom wall 32 </ b> A 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 that extends from the rear end portion of the first oil strainer portion 34 toward the bottom wall 32 </ b> A of the second oil pan portion 32.

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

  Thereby, while the rigidity of the 1st oil pan part 31 can be improved with the 1st oil strainer part 34, the rigidity of the curved part 33 can be improved with the boss | hub part 31E. For this reason, it can suppress that the 2nd oil pan part 32 deform | transforms from the bending part 33 by the vibration of the transmission 6 as a starting point.

Since the second oil pan 32 having a deep depth can be suppressed from being deformed in this way, in the second oil pan 32 where more oil is stored than the first oil pan 31, It can be prevented from shaking greatly.
For this reason, it is possible to prevent the second oil strainer portion 35 from sucking air in the second oil pan portion 32 and 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 is After flowing through the bottom wall 31A of the oil pan portion 31 and colliding with the bending portion 33, the oil pan portion 31 flows backward along the bottom wall 32A from the bending portion 33 (see FIG. 3).

  Thereby, the oil stored in the oil pan 5 can be cooled by the traveling wind, and the oil can be kept at an appropriate temperature. For this reason, the viscosity of oil can be kept appropriate, the lubricity of the lubrication part of the engine 2 can be improved, and engine parts can be prevented from deteriorating early.

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 dimension L1 in the axial direction 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 of the second oil strainer portion 35 is fastened by a bolt 38.

  Thereby, the installation area of the boss part 31E with respect to the curved part 33 can be increased, and the thickness of the boss part 31E in the direction of the thread groove 31e can be increased by the depth of the thread groove 31e. For this reason, the rigidity of the bending part 33 can be improved more effectively, and it can suppress more effectively that the 2nd oil pan part 32 deform | transforms from the bending part 33 by the vibration of the transmission 6 as a starting point.

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

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

  Thus, when the transmission 6 vibrates in the up / down / left / right directions, the first front propeller shaft 7 vibrates in the front / rear direction of the vehicle 1, and this vibration is transmitted through the transfer device 8 and the second front propeller shaft 9 to the front differential. Is transmitted to the device 11.

  Since the second front propeller shaft 9 and the front differential device 11 are installed laterally offset with respect to the oil pan 5, the oil pan 5 is connected to the second front propeller shaft 9 and the front differential device 11. It is easy to deform on the side where it is installed (X1 direction in FIG. 1).

  According to the oil pan 5 of the present embodiment, the bulging portion 31F is formed on the bottom wall 31A of the first oil pan portion 31. The bulging portion 31 </ b> F bulges upward from the bottom wall 31 </ b> A 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 bending portion 33. doing.

  Thereby, the rigidity of the 1st oil pan part 31 can be improved, and it can suppress easily that the oil pan 5 deform | transforms into the front side differential apparatus 11 side. For this reason, it can suppress more effectively that the 2nd oil pan part 32 deform | transforms from the curved part 33 by the vibration of the transmission 6. FIG.

  Further, in the oil pan 5 of the present embodiment, as shown in FIGS. 8 and 9, the second oil strainer portion 35 is provided with a rib 35B, and the curved portion 33 is provided with a boss portion 33A in which a thread groove is formed. The rib 35B may be fastened to the boss portion 33A by the bolt 43. The boss portion 31E of this embodiment constitutes the first boss portion of the present invention, and the boss portion 33A constitutes the second boss portion of the present invention.

  If it does in this way, the curved part 33 and the 2nd oil strainer part 35 can be connected, and the rigidity of the curved part 33 can be improved more effectively. For this reason, it can suppress more effectively that the 2nd oil pan part 32 deform | transforms from the curved part 33 by the vibration of the transmission 6. FIG.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the 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 ... speed change 7 ... first front propeller shaft (first propeller shaft), 8 ... transfer device, 9 ... second front propeller shaft (front propeller shaft), 11 ... front differential device (Differential device), 31 ... first oil pan portion, 31A, 32A ... bottom wall, 31B ... front wall, 31 ... side wall, 31E ... boss portion (first boss portion) ), 31F ... bulge part, 31e ... thread groove (fastening part), 32 ... second oil pan part, 33 ... curved part, 33A ... boss part (second boss) Part), 34 ... first oil strainer part, 35 ... second oil strainer part

Claims (4)

A shift mechanism provided in an internal combustion engine installed in the vehicle so as to have a cylinder block and the rotation axis of the crankshaft is directed in the longitudinal direction of the vehicle, and provided below the cylinder block and behind the internal combustion engine. An oil pan connected to the machine,
A first oil pan section; and the first oil pan section positioned behind the first oil pan section and coupled to the transmission so as to be deeper than the first oil pan section. A second oil pan part having a bottom wall located below the bottom wall of the part, and a curved part that curves from the bottom wall of the first oil pan part toward the bottom wall of the second oil pan part And
The first oil pan portion extends from the front wall of the first oil pan portion along the bottom wall of the first oil pan portion in the direction of the center axis of rotation of the crankshaft. A first oil strainer portion formed integrally with the portion is formed,
A second oil strainer portion extending from a rear end portion of the first oil strainer portion toward a bottom wall of the second oil pan portion is provided in the second oil pan portion;
A boss portion is formed at the rear end portion of the first oil strainer portion to which the tip portion of the second oil strainer is fitted.
The oil pan, wherein the boss portion is formed at a position connecting at least from the bottom wall of the first oil pan portion to the curved portion. The boss portion is formed in a shape having a size in a direction perpendicular to the axial direction of the first oil strainer portion with respect to the axial size of the first oil strainer portion,
2. The oil pan according to claim 1, wherein the boss portion includes a fastening portion to which a distal 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 longitudinal direction of the vehicle from the transfer device toward the side of the internal combustion engine;
A differential device provided at a front end portion of the second propeller shaft and transmitting the power of the second propeller shaft to the left and right front wheels so as to be differentially rotatable;
The oil pan has a bulging portion that bulges upward from a bottom wall on the side where the second propeller shaft or the differential device is installed at least 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 bending portion. The oil pan according to claim 1 or 2, characterized by the above. The second oil strainer portion extends along the curved portion,
The second boss portion to which the second oil strainer portion is fastened is formed in the curved portion when the boss portion is the first boss portion. 4. The oil pan according to any one of 3 above.