JP6879727B2 - Lubricating oil discharge structure - Google Patents

Description

The present invention relates to a lubricating oil discharge structure.

Patent Document 1 discloses a lubricating oil discharge structure in a transmission case of an automatic transmission for a vehicle.

Japanese Unexamined Patent Publication No. 2014-20421

In a belt-type continuously variable transmission for a vehicle, a storage chamber for a transmission mechanism is provided in a transmission case.
The transmission mechanism portion is composed of a primary pulley, a secondary pulley, and a belt wound around the primary pulley and the secondary pulley, and the transmission mechanism portion is provided inside a peripheral wall portion surrounding the accommodation chamber. ing.

In the transmission case, the peripheral wall portion is provided so as to open the accommodation chamber on the side of the transmission case, and the space on the oil pan side is located on the lower side of the accommodation chamber.
With reference to the vertical direction when the automatic transmission is mounted on the vehicle, a return hole for lubricating oil is opened in the lower region in the vertical direction on the peripheral wall portion.
This return hole communicates with the space on the oil pan side, and the lubricating oil used for lubricating and cooling the transmission mechanism is returned from the accommodation chamber to the oil pan side through the return hole. There is.

When the continuously variable transmission is driven, rotation is transmitted between the primary pulley and the secondary pulley via a belt.
At that time, the lubricating oil used for lubricating and cooling the primary pulley and the secondary pulley is scattered inside the accommodation chamber. Then, the lubricating oil scattered inside the accommodation chamber travels along the inner peripheral surface of the peripheral wall portion and reaches the region where the return hole is provided by its own weight, and then is discharged from the return hole to the oil pan side.

Therefore, the return hole is provided in the lowermost region of the peripheral wall portion so that more lubricating oil can be returned to the oil pan side.
However, when the temperature of the lubricating oil is low and the fluidity of the lubricating oil is low, such as immediately after driving the automatic transmission in a cold region, the arrival of the lubricating oil at the return hole is delayed. Then, the lubricating oil returning to the oil pan side may be insufficient.
Therefore, when the temperature of the lubricating oil is low and the fluidity of the lubricating oil is low, it is required that the lubricating oil can be appropriately returned to the oil pan side.

The present invention
The transmission case of the belt-type continuously variable transmission is provided with a peripheral wall portion surrounding the accommodation chamber of the transmission mechanism portion so as to open the accommodation chamber sideways.
A lubricating oil discharge structure in which a space on the oil pan side located below the storage chamber in the vertical direction and the storage chamber are communicated with each other and a return hole for lubricating oil is provided on the peripheral wall portion. ,
In the peripheral wall portion, a communication hole for communicating the storage chamber and the space on the oil pan side is provided in a region located above the return hole in the vertical direction .
In the peripheral wall portion, a protruding wall is provided between the return hole and the communication hole so as to cross the flow of the lubricating oil toward the return hole along the inner circumference of the peripheral wall portion . ..

According to the present invention, the lubricating oil that moves toward the return hole along the inner circumference of the peripheral wall portion can be returned to the space on the oil pan side from the communication hole in front of the return hole.
As a result, the residence time of the lubricating oil in the storage chamber can be shortened, so that the lubricating oil can be used in an oil pan in a shorter time even when the temperature of the lubricating oil is low and the fluidity of the lubricating oil is low. It can be returned to the space on the side.

It is a figure explaining the transmission case which adopted the lubricating oil discharge structure which concerns on embodiment. It is a figure explaining the lubricating oil discharge structure which concerns on embodiment. It is a figure explaining the lubricating oil discharge structure which concerns on embodiment. It is a figure explaining the modification of the lubricating oil discharge structure.

Hereinafter, the embodiment of the present invention will be described by exemplifying the case of the lubricating oil discharge structure 1 applied to the transmission case 10 of the belt-type continuously variable transmission for a vehicle.
FIG. 1 is a diagram illustrating a transmission case 10 that employs the lubricating oil discharge structure 1 according to the embodiment. FIG. 1A is a plan view of the transmission case 10 as viewed from the accommodation chamber 20 side of the transmission mechanism unit 15. FIG. 1B is a view taken along the line AA in FIG. 1A, and is a plan view of the transmission case 10 as viewed from the oil pan 17 side.

For convenience of explanation, in FIG. 1A, the joint surface 11a on the front side of the paper surface of the peripheral wall portion 11 is shown with hatching, and in FIG. 1B, the front side of the paper surface of the peripheral wall portion 31 is shown. The joint surface 31a on the side and the end surface 32a on the front side of the paper surface of the mounting portion 32 are shown with hatching.

As shown in FIG. 1A, the belt-type continuously variable transmission has a primary pulley Pa, a secondary pulley Pb, and a belt V bridged to the primary pulley Pa and the secondary pulley Pb. It has a mechanism unit 15.

The transmission mechanism unit 15 is housed in an accommodation chamber 20 provided in the transmission case 10. In the accommodation chamber 20, the primary pulley Pa and the secondary pulley Pb of the transmission mechanism unit 15 are rotated by a rotation shaft X1 parallel to each other. It is rotatably provided around the shaft X2.
In the transmission mechanism unit 15, when the rotational driving force of the engine (not shown) is input to the primary pulley Pa, the rotational driving force input to the primary pulley Pa is transmitted to the secondary pulley Pb via the belt V. It has become.

The transmission case 10 is provided with a peripheral wall portion 11 extending in the rotation shafts X1 and X2 directions from the side surface of the transmission case 10. When viewed from the directions of the rotating shafts X1 and X2, the peripheral wall portion 11 forms an annular shape surrounding the transmission mechanism portion 15, and the inside of the peripheral wall portion 11 is an accommodation chamber 20 for accommodating the transmission mechanism portion 15.

In the transmission case 10, the peripheral wall portion 11 is provided so as to open the accommodating chamber 20 toward the side of the transmission case 10 (rotational axes X1 and X2 directions).
In the embodiment, the primary pulley Pa and the secondary pulley Pb are located on the lower side and the upper side in the accommodation chamber 20 with reference to the vertical line VL direction in the state where the automatic transmission is mounted on the vehicle.

The joint surface 11a on the front side of the paper surface of the peripheral wall portion 11 in FIG. 1A is a flat surface orthogonal to the rotation axes X1 and X2.
The outer peripheral edge of the side cover 16 (see (b) in FIG. 1, virtual line) is fixed to the joint surface 11a with bolts, and by fixing the side cover 16 to the peripheral wall portion 11. , A closed containment chamber 20 is formed.

A valve body storage chamber 30 (see (b) in FIG. 1) for accommodating a control valve is provided in the lower part of the storage chamber 20 on the oil pan 17 (see (a) in FIG. 1, virtual line) side. The peripheral wall portion 31 surrounding the valve body accommodating chamber 30 is formed so as to bulge toward the front side of the paper surface in FIG. 1 (a).

As shown in FIG. 1B, the valve body accommodating chamber 30 has a peripheral wall portion 31 forming an annular shape when viewed from the oil pan 17 side, and a control valve 50 (FIG. 1) is inside the peripheral wall portion 31. The mounting portion 32 (see (b) of 3) is provided.
Bolt holes and oil holes are opened in the end surface 32a of each mounting portion 32 on the oil pan 17 side, and a bolt (not shown) penetrating the control valve 50 is screwed into the bolt hole to control valve. When the 50 is attached to the attachment portion 32, the oil passage on the transmission case 10 side and the oil passage in the control valve 50 communicate with each other through the oil holes.

The joint surface 31a on the front side of the paper surface of the peripheral wall portion 31 in FIG. 1B is a flat surface orthogonal to the rotation axes X1 and X2.
The outer peripheral edge of the oil pan 17 is fixed to the joint surface 31a with bolts, and by fixing the oil pan 17 to the peripheral wall portion 31, an automatic transmission is installed inside the oil pan 17. A storage space (space on the oil pan side) for the lubricating oil OL used for driving and lubricating the bolt is formed.
The valve body accommodating chamber 30 inside the peripheral wall portion 31 forms a part of the “space on the oil pan side”.

FIG. 2 is a diagram for explaining the lubricating oil discharge structure 1 according to the embodiment. FIG. 2A is a diagram for explaining the positional relationship between the return hole 12 and the communication hole 13 constituting the lubricating oil discharge structure 1, and is an enlarged view of a main part of FIG. 1B. FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A, and is a diagram illustrating a main part of the lubricating oil discharge structure 1. FIG. 2C is a sectional view taken along line BB in FIG. 2B, and is a diagram for explaining a main part of the lubricating oil discharge structure 1.

For convenience of explanation, in FIG. 2A, the joint surface 31a on the front side of the paper surface of the peripheral wall portion 31 and the end surface 32a on the front side of the paper surface of the mounting portion 32 are shown with hatching. Further, the region showing the opening of the return hole 12 and the communication hole 13 described later is also shown with hatching.
Further, in FIG. 2C, the positions of the mating surfaces of the side cover 16 that closes the opening of the accommodation chamber 20 and the joint surface 31a of the peripheral wall portion 31 are indicated by virtual lines indicated by reference numerals F.

FIG. 3 is a diagram for explaining the lubricating oil discharge structure 1 according to the embodiment. FIG. 3A is a diagram for explaining the operation of the lubricating oil discharge structure 1, and FIG. 3B is a diagram for explaining the positional relationship between the communication hole 13 and the suction port 51a of the oil strainer 51. is there.
For convenience of explanation, in FIG. 3B, the joint surface 31a on the front side of the paper surface of the peripheral wall portion 31 is shown with hatching. Further, the region showing the opening of the return hole 12 and the communication hole 13 is also shown with hatching. Further, the outer shapes of the control valve 50 and the oil strainer 51 are shown by virtual lines.

In the accommodation chamber 20 of the transmission mechanism unit 15, the lubricating oil OL used for driving, lubricating, and cooling the primary pulley Pa and the secondary pulley Pb is discharged from the primary pulley Pa and the secondary pulley Pb.
Therefore, the lubricating oil OL discharged when the primary pulley Pa and the secondary pulley Pb are rotating around the rotation shafts X1 and X2 is discharged in the radial direction of the rotation shafts X1 and X2 by the centrifugal force due to the rotation. It adheres to the inner peripheral surface of the containment chamber 20. Specifically, it adheres to the bottom surface 201 of the accommodation chamber 20 (see (c) in FIG. 2) and the inner peripheral surface 11b (see (b) in FIG. 2) of the peripheral wall portion 11.
Then, the lubricating oil OL adhering to the inner peripheral surface of the accommodating chamber 20 travels along the inner peripheral surface of the accommodating chamber 20 and moves toward the lower part of the accommodating chamber 20 by its own weight.

Therefore, with respect to the vertical VL direction when the automatic transmission is mounted on the vehicle, the space on the peripheral wall portion 11 located on the lower side in the vertical VL direction is the space on the accommodation chamber 20 and the oil pan 17 side. A return hole 12 for communicating with (valve body accommodating chamber 30) is provided.

The return hole 12 when viewed from the oil pan 17 side has a substantially rectangular shape (see (a) in FIG. 2), and the lubricating oil OL that has moved downward in the vertical VL direction in the accommodation chamber 20 due to its own weight. However, it is returned to the oil pan 17 side through the return hole 12.

As shown in FIG. 2B, in the accommodation chamber 20, a tubular shape surrounding the oil passage is located above the return hole 12 in the vertical VL direction and avoiding interference with the primary pulley Pa. A boss portion 33 is provided.
The boss portion 33 is located outside the tangent line TL passing through the arcuate outer circumference of the primary pulley Pa and in the vicinity of the peripheral wall portion 11 when viewed from the direction of the rotation axis X1.
Here, the tangent line TL is a tangent line passing through the intersection P2 between the diameter line R passing through the position P1 at which the belt V is separated from the primary pulley Pa and the outer circumference of the primary pulley Pa.

The transmission case 10 is provided with an extension wall 40 for guiding the lubricating oil OL moving along the inner peripheral surface 11b of the peripheral wall portion 11 toward the return hole 12.
As shown in FIG. 3A, the extending wall 40 is provided so as to straddle the boss portion 33 and the bolt seat portion 112 surrounding the bolt hole 111 of the peripheral wall portion 11.

The extending wall 40 is provided linearly along the virtual line Lm in a direction in which the height in the direction of the vertical line VL increases from the boss portion 33 toward the bolt seat portion 112 side when viewed from the direction of the rotation axis X1. Has been done.
On the bolt seat 112 side of the extension wall 40, a notch 41 that communicates the primary pulley Pa side (inner peripheral side) and the peripheral wall portion 11 side (outer peripheral side) of the extension wall 40 extends the extension wall 40. It is provided so as to penetrate in the thickness direction.

In the extending wall 40, a protruding wall 42 protruding toward the primary pulley Pa side is provided on the boss portion 33 side of the notch portion 41, and the protruding wall 42 is offset from the notch portion 41 to the boss portion 33 side. It is provided in.
The protruding wall 42 is oriented orthogonal to the virtual line Lm in order to hinder the movement of the lubricating oil OL that moves beyond the notch 41 to the return hole 12 side (left side in (a) of FIG. 3). It is provided across the OL movement path.

Therefore, the lubricating oil OL that has moved beyond the notch 41 to the return hole 12 side (left side in FIG. 3A) is hindered from moving to the return hole 12 side by the protruding wall 42. ..
The bolt seat portion 112 side of the extension wall 40 collides with the protruding wall 42 in the direction of movement of the lubricating oil OL, which moves the inner circumference of the peripheral wall portion 11 downward toward the return hole 12 side. It functions as a guide wall 40a that changes in the direction of lubrication.

Here, when the fluidity of the lubricating oil OL is extremely low due to the low temperature of the lubricating oil OL, such as immediately after starting the engine in an environment of extremely low temperature (for example, −40 ° C.), the notch 41 is formed. The movement of the lubricating oil OL that could be exceeded is hindered by the protruding wall 42 located at the tip of the notch 41.
In this case, the lubricating oil OL stays in the vicinity of the protruding wall 42, and when the amount of the retained lubricating oil OL increases, the lubricating oil OL is discharged from the notch 41 to the lower side of the peripheral wall portion 11.

Further, when the fluidity of the lubricating oil OL is high, the lubricating oil OL guided by the guide wall 40a and colliding with the protruding wall 42 moves in the direction from the direction toward the protruding wall 42 toward the notch 41. Is inverted to.
Also in this case, the lubricating oil OL is discharged from the notch 41 to the lower side of the peripheral wall portion 11.

As shown in FIG. 3A, in the transmission case 10 when viewed from the directions of the rotating shafts X1 and X2, the boss portion 33 and the bolt seat portion 112 are located between the protruding wall 42 and the peripheral wall portion 11. A communication hole 13 is opened in the area between them.

The communication hole 13 is formed in the vicinity of the bolt seat portion 112 in a direction along the opening direction of the return hole 12 (vertical direction in FIG. 2B), and is formed with the accommodating chamber 20 inside the peripheral wall portion 11. , The valve body accommodating chamber 30 (the space on the oil pan 17 side) communicates with each other through the communication hole 13.

Further, as shown in FIG. 3B, the communication hole 13 is opened at a position above the oil strainer 51 attached to the control valve 50.
The return hole 12 is opened at a position above the control valve 50, and the control valve 50 is formed to be thicker and have a wider area than the oil strainer 51.
Therefore, the lubricating oil OL discharged from the communication hole 13 into the valve body accommodating chamber 30 reaches the suction port 51a of the oil strainer 51 more than the lubricating oil OL discharged from the return hole 12 into the valve body accommodating chamber 30. Since the moving distance to the oil is short, the lubricating oil OL can reach the suction port 51a of the oil strainer 51 in a shorter time.

The operation of the lubricating oil discharge structure 1 having such a configuration will be described.
The lubricating oil OL discharged into the accommodation chamber 20 from the primary pulley Pa and the secondary pulley Pb of the transmission mechanism portion 15 is the bottom surface 201 of the accommodation chamber 20 (see (c) of FIG. 2) and the inner circumference of the peripheral wall portion 11. Adheres to surface 11b (see (b) in FIG. 2).

Then, of the lubricating oil OL adhering to the bottom surface 201, the lubricating oil that has reached the region where the extending wall 40 is provided has the opening of the accommodation chamber 20 sealed by the side cover 16, so that the extending wall It falls from the notch 41 of 40 toward the communication hole 13.

On the other hand, the lubricating oil OL adhering to the inner peripheral surface 11b of the peripheral wall portion 11 travels along the inner peripheral surface 11b and moves toward the lower side where the return hole 12 is provided (FIG. 1 (a), FIG. 2). (B)).
As shown in FIG. 3A, when the lubricating oil OL moving by its own weight reaches the region where the extending wall 40 is provided, the moving direction of the lubricating oil OL collides with the protruding wall 42 by the guiding wall 40a. It is changed in the direction of
Then, when the lubricating oil OL that has moved along the guide wall 40a collides with the protruding wall 42, the moving direction of the lubricating oil OL is reversed by the protruding wall 42, and the communication hole 13 that opens to the inner circumference of the peripheral wall portion 11 is formed. It is changed in the direction to go.

In this way, the lubricating oil OL that has adhered to the bottom surface 201 and the inner peripheral surface 11b and has reached the communication hole 13 is finally discharged from the accommodation chamber 20 into the valve body accommodation chamber 30 through the communication hole 13. Lubricate.
As shown in FIG. 3B, the communication hole 13 is provided at a position overlapping the oil strainer 51 when viewed from the oil pan 17 side. Therefore, the lubricating oil OL discharged into the valve body accommodating chamber 30 through the communication hole 13 can be quickly moved to the vicinity of the suction port 51a of the oil strainer 51.

On the other hand, when the communication hole 13 is not provided, the lubricating oil OL that has reached the area where the extension wall 40 is provided bypasses the area where the return hole 12 is provided and then accommodates the valve body. It is discharged to the chamber 30.
Therefore, the moving distance is increased by the distance from the region where the extending wall 40 is provided to the return hole 12 and the distance from the return hole 12 to the suction port 51a of the oil strainer 51.
Therefore, when the temperature of the lubricating oil OL is low and the fluidity of the lubricating oil OL is low, the return of the lubricating oil OL to the oil pan 17 side, particularly to the suction port 51a of the oil strainer 51, becomes poor.

In the transmission case 10 according to the embodiment, the extension wall 40 is provided by providing a communication hole 13 for communicating the accommodation chamber 20 and the valve body accommodation chamber 30 in the area where the extension wall 40 is provided. The moving distance of the lubricating oil OL from the region to the suction port 51a of the oil strainer 51 is shortened.
As a result, when the temperature of the lubricating oil OL is low and the fluidity of the lubricating oil OL is low, the return of the lubricating oil OL to the oil pan 17 side, particularly the return to the suction port 51a of the oil strainer 51 becomes worse. Can be suppressed.

As described above, in the embodiment, (1) in the transmission case 10 of the belt-type continuously variable transmission, the peripheral wall portion 11 surrounding the accommodation chamber 20 of the transmission mechanism portion 15 sideways the accommodation chamber 20 (primary pulley Pa). , The direction along the rotation axes X1 and X2 of the secondary pulley Pb) is provided.
The peripheral wall portion 11 communicates with the space on the oil pan 17 side (valve body storage chamber 30) located below the storage chamber 20 in the vertical VL direction and the storage chamber 20, and the lubricating oil OL return hole 12 Is a lubricating oil discharge structure 1 provided with
In the peripheral wall portion 11, a communication hole 13 for communicating the storage chamber 20 and the space on the oil pan 17 side (valve body storage chamber 30) is provided in a region located above the return hole 12 in the vertical VL direction. The configuration was set to.

With this configuration, the lubricating oil OL that moves toward the return hole 12 along the inner peripheral surface of the peripheral wall portion 11 is transferred from the communication hole 13 in front of the return hole 12 to the valve body accommodating chamber 30 (space on the oil pan side). ) Can be returned.
As a result, the residence time of the lubricating oil OL in the storage chamber 20 can be shortened, so that the lubricating oil OL can be used even when the temperature of the lubricating oil OL is low and the fluidity of the lubricating oil OL is low. It can be returned to the valve body accommodating chamber 30 in a shorter time.

(2) In the peripheral wall portion 11, a protruding wall 42 is provided between the return hole 12 and the communication hole 13 so as to cross the flow of the lubricating oil OL toward the return hole 12.

With this configuration, the lubricating oil OL toward the return hole 12 collides with the protruding wall 42, so that the moving direction of the lubricating oil OL can be changed to the side toward the communication hole 13.
As a result, more lubricating oil OL can be returned from the communication hole 13 to the valve body accommodating chamber 30 side.

(3) A guide wall 40a for guiding the lubricating oil OL to the protruding wall 42 is provided on the inner circumference of the peripheral wall portion 11.

With this configuration, the lubricating oil OL can be reliably collided with the protruding wall 42 and the moving direction of the lubricating oil OL can be changed. Therefore, the moving direction of the changed lubricating oil OL is set to the direction toward the communication hole 13. As a result, more lubricating oil OL can be discharged from the communication hole 13 to the valve body accommodating chamber 30 side.

(4) The peripheral wall portion 11 is provided with an extension wall 40 extending from the inner circumference of the peripheral wall portion 11 into the accommodation chamber 20, and the extension wall 40 is provided with the inner peripheral side of the extension wall 40. A notch 41 that communicates with the outer peripheral side is provided.
The communication hole 13 is configured to face the notch 41 on the peripheral wall portion 11 side of the extension wall 40.

With this configuration, the lubricating oil OL that moves along the extension wall 40 can be dropped from the notch 41 toward the communication hole 13, so that more lubricating oil OL can be valved from the communication hole 13. It can be discharged to the body storage chamber 30 side.

(5) The extending wall 40 is configured such that the protruding wall 42 is provided before the notch 41 in the extending direction of the extending wall 40.

With this configuration, the lubricating oil OL whose movement is hindered by the protruding wall 42 can be discharged from the notch 41 toward the communication hole 13, so that more lubricating oil OL can be discharged from the communication hole 13 to the valve. It can be discharged to the body storage chamber 30 side.

Further, when the fluidity of the lubricating oil OL is extremely low due to the low temperature of the lubricating oil OL, such as immediately after starting the engine in an extremely low temperature (for example, −40 ° C.) environment, the peripheral wall portion 11 The lubricating oil OL adhering to the inner circumference tends not to move toward the return hole 12 until a certain amount of lump is reached.
Then, the lubricating oil OL having a certain amount of mass tends to move downward in the vertical VL direction.
Therefore, by providing a notch 41 in the middle of the extending wall 40 and opening the communication hole 13 below the notch 41, the lubricating oil OL having a certain amount of mass is positively accommodated in the valve body. It can be discharged to the chamber 30 side.

Further, the protruding wall 42 is provided on the boss portion 33 side of the notch portion 41, and even when the lumped lubricating oil OL exceeds the notch portion 41, the lubricating oil OL is moved to the return hole 12 side. The movement of the oil is blocked by the protruding wall 42.
Then, when the newly arrived lubricating oil OL lumps join the lubricating oil OL whose movement is hindered by the protruding wall 42, the enlarged lubricating oil OL lumps fall from the notch 41 toward the communication hole 13. Will be done.
Therefore, a lump of the lubricating oil OL having low fluidity can be guided to the communication hole 13, and a larger amount of the lubricating oil OL can be discharged from the communication hole 13 to the valve body accommodating chamber 30 side.

Further, when the fluidity of the lubricating oil OL is high, the lubricating oil OL guided by the guide wall 40a and colliding with the protruding wall 42 reverses its movement direction toward the notch 41 side from the direction toward the protruding wall 42. Will be done. Therefore, the lubricating oil OL discharged from the notch 41 can be appropriately guided toward the communication hole 13.

(6) In the extension wall 40, the guide wall 40a on the front side of the notch 41 in the extension direction of the extension wall 40 is a guide wall 40a for guiding the lubricating oil OL to the protrusion wall 42. And said.

With this configuration, when the fluidity of the lubricating oil OL is high, the lubricating oil OL guided by the guide wall 40a and colliding with the protruding wall 42 moves from the direction toward the protruding wall 42 to the notch. It is inverted in the direction toward 41.
Therefore, also in this case, the lubricating oil OL can be discharged from the notch 41 to the lower side of the peripheral wall portion 11 and discharged from the communication hole 13 to the valve body accommodating chamber 30 side.

(7) In the valve body accommodating chamber 30 (space on the oil pan side), the communication hole 13 is configured to be open closer to the suction port 51a of the oil strainer 51 than the return hole 12.

With this configuration, the moving distance of the lubricating oil OL that has reached the region where the extension wall 40 is provided to the suction port 51a of the oil strainer 51 is shorter than that in the case where the communication hole 13 is not provided. ..
As a result, when the temperature of the lubricating oil OL is low and the fluidity of the lubricating oil OL is low, the return of the lubricating oil OL to the oil pan 17 side, particularly the return to the suction port 51a of the oil strainer 51 becomes worse. Can be suppressed.

FIG. 4 is a diagram illustrating a lubricating oil discharge structure according to a modified example.
In the above-described embodiment, the lubricating oil is bypassed by the primary pulley Pa side (rotating shaft X1 side) of the boss portion 33, and the extending wall 40 for guiding the lubricating oil OL to the return hole 12 side is used. The case where the discharge structure 1 is provided is illustrated.
The lubricating oil discharge structure 1 is not limited to this embodiment, and as shown in FIG. 4A, when the extending wall 40 is not provided, the arc-shaped protruding wall 43 is formed by the boss portion 33. The lubricating oil discharge structure 1A having the configuration provided in 1A may be used.
In this case, it is preferable that the protruding wall 43 is provided so as to project from the boss portion 33 toward the bolt seat portion 112, and the surface of the protruding wall 43 having a large radius of curvature is directed toward the bolt seat portion 112 side. As a result, the movement of the lubricating oil OL can be blocked on the tip 43a side of the protruding wall 43, and the lubricating oil OL that has been blocked can be guided to the communication hole 13 side.
By adopting the lubricating oil discharge structure 1A having the protruding wall 43 and the communication hole 13, the same function and effect as those of the above-described embodiment can be obtained.

Further, as shown in FIG. 4B, a protruding wall 44 that protrudes from the inner peripheral surface 11b of the peripheral wall portion 11 to the inside of the accommodation chamber 20 is provided, and the protruding wall 44 is formed by the boss portion 33 and the bolt seat. As a lubricating oil discharge structure 1B having a structure in which the arc-shaped outer periphery of the portion 112 is formed with a length extending to a virtual line Lm connecting the outer circumferences thereof and the lubricating oil OL is guided to the communication hole 13 by the protruding wall 44. good.
By adopting the lubricating oil discharge structure 1B having the protruding wall 44 and the communication hole 13, the same function and effect as those of the above-described embodiment can be obtained.

1, 1A, 1B Lubricating oil discharge structure 10 Transmission case 11 Peripheral wall 11a Joint surface 11b Inner peripheral surface 12 Return hole 13 Communication hole 15 Transmission mechanism 16 Side cover 17 Oil pan 20 Storage chamber 21 Peripheral wall 21a Joint surface 30 Valve Body containment chamber 31 Peripheral wall 31a Joint surface 32 Mounting part 32a End surface 33 Boss part 40 Extension wall 40a Guide wall 41 Notch 42, 43, 44 Protruding wall 50 Control valve 51 Oil strainer 51a Suction port 111 Bolt hole 112 Bolt seat 201 Bottom Lm Virtual line OL Lubricating oil Pb Secondary pulley Pa Primary pulley R Diameter line TL tangent line V belt VL Vertical line X1 Rotation axis X2 Rotation axis

Claims (6)

The transmission case of the belt-type continuously variable transmission is provided with a peripheral wall portion surrounding the accommodation chamber of the transmission mechanism portion so as to open the accommodation chamber sideways.
A lubricating oil discharge structure in which a space on the oil pan side located below the storage chamber in the vertical direction and the storage chamber are communicated with each other and a return hole for lubricating oil is provided on the peripheral wall portion. ,
In the peripheral wall portion, a communication hole for communicating the storage chamber and the space on the oil pan side is provided in a region located above the return hole in the vertical direction .
The peripheral wall portion is characterized in that a protruding wall is provided between the return hole and the communication hole so as to cross the flow of the lubricating oil toward the return hole along the inner circumference of the peripheral wall portion. Lubricating oil discharge structure. Lubricating oil discharge structure according to claim 1 in the inner periphery of the peripheral wall, characterized in that the guide wall for guiding the lubricating oil to the protruding wall is provided. The transmission case of the belt-type continuously variable transmission is provided with a peripheral wall portion surrounding the accommodation chamber of the transmission mechanism portion so as to open the accommodation chamber sideways.
A lubricating oil discharge structure in which a space on the oil pan side located below the storage chamber in the vertical direction and the storage chamber are communicated with each other and a return hole for lubricating oil is provided on the peripheral wall portion. ,
In the peripheral wall portion, a communication hole for communicating the storage chamber and the space on the oil pan side is provided in a region located above the return hole in the vertical direction.
The peripheral wall portion is provided with an extension wall extending from the inner circumference of the peripheral wall portion into the accommodation chamber.
The extending wall guides the lubricating oil, which moves along the inner circumference of the peripheral wall portion, to the return hole side.
The extending wall is provided with a notch that communicates the inner peripheral side and the outer peripheral side of the extending wall.
The communication hole is a lubricating oil discharge structure characterized in that it is opened on the outer peripheral side of the extension wall. The claim is characterized in that the extending wall is provided with a protruding wall in a direction crossing the flow of the lubricating oil toward the return hole before the notch in the extending direction of the extending wall. Item 3. The lubricating oil discharge structure according to item 3. In the extending wall, the front side of the notched portion in the extending direction of the extending walls has, according to the lubricating oil in claim 4, characterized in that has a guide wall for guiding said projecting wall Lubricating oil discharge structure. The lubrication according to any one of claims 1 to 5 , wherein the communication hole is opened closer to the suction port of the oil strainer than the return hole in the space on the oil pan side. Oil discharge structure.

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