JP5808351B2 - Induction structure of lubricating oil in automatic transmission - Google Patents

Description

  The present invention relates to a structure for guiding lubricating oil in an automatic transmission.

Some automatic transmissions have an oil pump disposed away from a drive shaft.
An automatic transmission having such an oil pump includes a rotation transmission mechanism having a drive sprocket provided on a drive shaft, a driven sprocket provided on the oil pump, and a chain wound around both sprockets, The oil pump is driven by the rotation transmitted through the rotation transmission mechanism.

Here, if the driven sprocket of the rotation transmission mechanism is disposed on the lower side of the transmission case and is positioned in the lubricating oil, the lubricating oil in the transmission case is scraped up by the driven sprocket when the oil pump is driven. It will be.
In addition to the rotation transmission mechanism, a rotation element is provided in the transmission case, and if the scraped lubricating oil interferes with another rotation element, friction is caused with respect to the rotation of the other rotation element.

  For this reason, various wall structures have been proposed for preventing the scraped lubricating oil from interfering with other rotating bodies (for example, Patent Document 1).

Japanese Utility Model Publication No. 62-97354

FIG. 4 is a diagram illustrating a wall structure for preventing interference of lubricating oil.
In the transmission case 100, a large-diameter final gear F is provided adjacent to the rotation transmission mechanism 101, and the lower side of the final gear F and the driven sprocket 103 of the rotation transmission mechanism 101 are positioned in the lubricating oil. doing. A partition wall 107 is provided below the transmission case 100 to partition the transmission case 100 into a final gear F side and a rotation transmission mechanism 101 side.

For example, when the driven sprocket 103 and the final gear F rotate in the clockwise direction CW in the figure, the lubricating oil scraped up by the driven sprocket 103 flows into the final gear F side over the partition wall 107 (in the figure). , See arrow A).
Then, the flow of lubricating oil (see arrow A) scraped up by the driven sprocket 103 collides with the flow of lubricating oil (see arrow B) that is scraped up by the final gear F and moves to the rotation transmission mechanism 101 side. End up.

  Therefore, the support member 105 that rotatably supports the drive sprocket 102 is provided with a wall portion 106 that prevents inflow of the lubricating oil scraped up by the driven sprocket 103 to the final gear F side.

  In the support member 105 of the drive sprocket 102, the wall 106 is provided in a direction intersecting with the longitudinal direction of the chain 104 wound around the drive sprocket 102 and the driven sprocket 103, and the driven sprocket 103 is scraped up. The movement of the lubricating oil is blocked by the wall portion 106, thereby preventing the lubricating oil scraped up by the driven sprocket 103 from flowing into the final gear F side.

  However, the lubricating oil whose movement is blocked by the wall portion 106 falls downward in the transmission case 100 due to gravity, and collides with the lubricating oil that the driven sprocket 103 scrapes up (arrow A, C)), this collision increases the air content of the lubricating oil.

  Therefore, it is required to prevent the lubricating oil scraped up by the rotating body (driven sprocket 103) from interfering with the other rotating body (final gear F) and not to increase the air content of the lubricating oil. ing.

In the present invention, the driven gear disposed below the drive side gear is located in the lubricating oil in the transmission case, and the rotation of the drive side gear causes the drive side gear and the driven side gear to rotate. Lubricating oil induction structure in an automatic transmission configured to be transmitted to a driven gear via a chain wound around the gear and provided with a rotating body adjacent to the torque transmission side of the chain A wall portion is provided along the torque transmission side of the chain, and the wall portion includes a first wall portion extending vertically between the drive-side gear and the rotating body, and an upper portion in a direction away from the rotating body. A second wall portion extending linearly from the first wall portion, and the second wall portion has a gap between the chain and a downstream side in the rotational direction of the gear on the drive side. It is arranged so that it becomes narrower toward the side It was induced structure of the lubricating oil in the automatic transmission according to claim.

With this configuration, the lubricating oil scooped up by the driven gear passes between the chain wound around the drive gear and the wall and is discharged to the upper side in the transmission case. Therefore, the flow of the lubricating oil scraped up by the driven gear is not hindered by the wall.
If the flow of lubricating oil scraped up by the driven gear is obstructed, the lubricating oil whose flow has been blocked collides with the lubricating oil newly scraped up by the driven gear, resulting in a large amount of lubricating oil. However, since the flow of the lubricating oil scraped up by the driven gear is not hindered, an increase in the air content of the lubricating oil due to the collision of the lubricating oil can be prevented.

It is a top view of a transmission case. It is a figure explaining the induction | guidance | derivation structure of the lubricating oil concerning embodiment. It is a figure explaining the support member of a drive sprocket. It is a figure explaining the wall structure which prevents the interference of the conventional lubricating oil.

Embodiments of the present invention will be described below.
FIG. 1 is a plan view of the transmission case 10 as viewed from the torque converter side. The arrangement of the final gear F in the transmission case 10 and the positions of the mounting portions 21 and 22 of the support member 50 (see FIG. 2). It is a figure explaining a relationship.
2A is a diagram illustrating a state in which the rotation transmission mechanism 80 is assembled to the transmission case 10, and is an enlarged view of a portion of the rotation transmission mechanism 80, and FIG. These are the enlarged views of the area | region A in (a). 2 (a) and 2 (b), the chain V wound around the drive sprocket 60 and the driven sprocket 70 is simply displayed.

As shown in FIG. 1, an annular peripheral wall 11 that surrounds the outer periphery of the transmission case 10 over the entire circumference is provided on the surface of the transmission case 10 on the side of the torque converter.
The upper right portion in the peripheral wall 11 is a housing portion 20 for a forward / reverse switching mechanism (not shown) to which the output rotation of the torque converter is input. The lower side of the accommodating portion 20 is a valve accommodating portion 30 that accommodates a control valve body (not shown). The valve accommodating portion 30 is located below the boundary portion 24 with respect to the accommodating portion 20. It bulges from the portion 20 to the back side of the drawing.

  The accommodating portion 20 and the valve accommodating portion 30 are located on the right side of the transmission case 10 when viewed from the torque converter side, and the differential chamber 40 for accommodating the final gear F is located on the left side of the valve accommodating portion 30. ing.

An insertion hole 20a is provided substantially at the center of the accommodating portion 20, and an input shaft (not shown) of a primary pulley located on the opposite side of the accommodating portion 20 is inserted into the insertion hole 20a. A recessed hole 20b is provided below the insertion hole 20a, and one end of an input shaft (not shown) of the forward / reverse switching mechanism is rotatably supported in the recessed hole 20b.
Mounting portions 21 and 22 are provided on the radially outer side of the recessed hole 20b so as to protrude to the torque converter side (front side of the paper). These mounting portions 21 and 22 are provided at positions that are substantially targeted with the concave hole 20b interposed therebetween, and each has an arc shape as viewed from the axial direction so as to surround the periphery of the concave hole 20b.

  The mounting portions 21 and 22 are provided with a plurality of bolt holes 21a and 22a at intervals in the longitudinal direction, and the support member 50 of the drive sprocket 60 is mounted on the surface of the mounting portions 21 and 22 on the torque converter side. These are fixed with bolts B (see FIG. 2).

  In the transmission case 10, an oil pump (not shown) driven by the engine is provided below the recessed hole 20b that supports the input shaft of the forward / reverse switching mechanism, and is driven to rotate by this oil pump. A rotation transmission mechanism 80 for transmitting force is provided in a predetermined range from the mounting portions 21 and 22 to the lower side of the transmission case 10.

  As shown in FIG. 2, the rotation transmission mechanism 80 includes a drive sprocket 60 that rotates integrally with the input shaft of the forward / reverse switching mechanism, a driven sprocket 70 that rotates integrally with the oil pump (pump shaft), An oil pump (not shown) positioned radially outward (lower in the case of FIG. 1) with respect to the input shaft. It is driven by the rotation transmitted through the rotation transmission mechanism 80.

In the transmission case 10, the drive sprocket 60 is rotatably supported by the support member 50 fixed to the mounting portions 21 and 22, and a driven sprocket 70 is positioned below the drive sprocket 60. Yes.
As shown in FIG. 1, in the transmission case 10, the support portion 25 of the driven sprocket 70 is provided at the boundary portion 24 between the storage portion 20 below the concave hole 20 b and the valve storage portion 30. The driven sprocket 70 connected to the rotation shaft of the motor is rotatably supported by a recessed hole 25a provided in the support portion 25.

  In the embodiment, the drive sprocket 60 rotates only in the clockwise direction in the figure (the arrow CW direction in the figure). Therefore, the chain V wound around the drive sprocket 60 and the driven sprocket 70 moves in the clockwise direction in the figure, and transmits the rotation of the drive sprocket 60 to the driven sprocket 70 side. The left side in the figure as viewed from the side is the torque transmission side (tight side) of the chain V.

The final gear F provided in the differential chamber 40 is provided so as to be rotatable around the rotation axis X3 (see FIG. 1), and when the vehicle is traveling forward, the final gear F is clockwise (in the figure, the direction of the arrow CW). Rotate to.
The rotation axis X3 is provided in parallel to the rotation axes X1 and X2 of the drive sprocket 60 and the driven sprocket 70.

The final gear F is located on the torque transmission side of the rotation transmission mechanism 80 (chain V). In the transmission case 10 of the embodiment, the final gear F and the rotation transmission mechanism 80 (drive sprocket 60 and driven sprocket). 70 and the chain V) are provided in a positional relationship in which the positions in the direction of the rotation axis X3 substantially coincide.
In other words, when the transmission case 10 is not provided with a countermeasure for preventing the interference of the lubricating oil, the lubricating oil picked up by the final gear F interferes with the rotation transmission mechanism 80, and the rotation transmission mechanism 80 (driven sprocket). The final gear F and the rotation transmission mechanism 80 are provided in a positional relationship where the lubricating oil scooped up 70) interferes with the final gear F.

  FIG. 3 is a view for explaining the support member 50 of the drive sprocket 60. FIG. 3A is a perspective view, and FIG. 3B is a plan view seen from the torque converter side. FIG. 3C is a view of the state in which the drive sprocket 60 is assembled to the support member 50 as seen from the direction of arrows AA in FIG. 3B, and is wound around the drive sprocket 60. In order to make the position of the chain V easy to understand, it is shown with hatching.

The support member 50 has a plate-like base 51. The base 51 is oriented in a direction orthogonal to the rotation axis X1 of the drive sprocket 60 when the support member 50 is attached to the attachment portions 21 and 22. It is arranged.
At the center of the base 51, a through hole 51a is formed through the base 51 in the thickness direction, and an input shaft (not shown) of the forward / reverse switching mechanism is inserted through the through hole 51a.

  A peripheral wall 52 surrounding the through holes 51a at a predetermined interval is formed on the surface of the base 51 on the torque converter side so as to protrude toward the torque converter. The inner diameter D1 of the peripheral wall 52 has a diameter that substantially matches the outer diameter of a cylindrical shaft portion (not shown) of the drive sprocket 60. In the support member 50, the drive sprocket 60 has a cylindrical shaft portion. Is rotatably supported in a state of being inserted into the peripheral wall 52.

  On both sides in the width direction of the base portion 51, insertion holes 51b and 51c for inserting the bolts B are provided through the base portion 51 in the thickness direction, and these insertion holes 51b and 51c are provided on the mounting portion 21 described above. It is provided at a position aligned with the 22 bolt holes 21a, 22a.

As seen from the torque converter side, a guide wall 53 that protrudes in the same direction as the peripheral wall 52 is provided on the side edge of the base 51 on the side of the insertion hole 51 b (side edge on the side of the final gear F).
The guide wall 53 is provided substantially along the side edge of the base 51, and the height h 1 of the guide wall 53 from the upper surface 510 of the base 51 is higher than the height h 2 of the peripheral wall 52. (See (c) of FIG. 3).
In the embodiment, the height h1 of the guide wall 53 is set to a height that covers the radially outer side of the drive sprocket 60 assembled to the peripheral wall 52. The guide wall 53 is lubricated by the final gear F. Of the oil, the flow of the lubricating oil from the diagonally upper left side in FIG. 2 toward the drive sprocket 60 is cut off.

  Further, the upper surface 510 of the base 51 is a flat surface orthogonal to the rotation axis X1, and in the portion between the peripheral wall 52 and the guide wall 53 in the base 51, the chain V wound around the drive sprocket 60 and Between these, space S1 (refer FIG.3 (c)) which can let lubricating oil pass is ensured.

  In the state where the support member 50 is attached to the transmission case 10, the guide wall 53 includes a partition portion 531 extending in the vertical direction in the transmission case 10 and a direction approaching the peripheral wall 52 from the upper end of the partition portion 531 (right side in the figure). And a guide portion 532 extending obliquely upward).

  A partition wall 12 that partitions the differential chamber 40 side and the valve housing 30 side in the transmission case 10 is provided at a lower portion of the transmission case 10, and the partition portion 531 of the guide wall 53 is the partition wall 12. It is located on the approximate extension of.

  The lower end 532b of the guide portion 532 extends from the outer periphery of the chain V wound around the driven sprocket 70 in a tangential direction, and the differential chamber 40 is located at a position where a straight line Lo passing through the peripheral edge of the partition wall 12 on the driven sprocket 70 side intersects. It is located on the side (left side in the figure).

  The lubricating oil scraped up by the driven sprocket 70 forms a flow along the straight line Lo. Therefore, by positioning the lower end 532b side of the guide portion 532 and the partition portion 531 closer to the differential chamber 40 side than the straight line Lo, the inflow of the scraped-up lubricating oil to the differential chamber 40 side is suitably prevented.

The guide portion 532 extends substantially linearly from the upper end of the partition portion 531 toward the upper right in the drawing, and the upper end portion 532a of the guide portion 532 is a chain wound around the drive sprocket 60 and the driven sprocket 70. V is located on the extension of the straight line portion V1 on the torque transmission side. Specifically, it extends to a position P1 that intersects the straight line Ln along the longitudinal direction of the straight line portion V1.
This is because if the upper end portion 532a of the guide portion 532 is positioned on the left side in the drawing with respect to the straight line Ln, there is a possibility that the lubricating oil scooped up by the driven sprocket 70 may escape as it is above the drive sprocket 60. is there. In such a case, the lubricating oil picked up by the driven sprocket 70 collides with the flow of lubricating oil picked up by the final gear F and moving to the drive sprocket 60 side from the upper left side in the figure (see arrow B in the figure). As a result, the air content of the lubricating oil may increase.
As described above, by setting the position of the upper end portion 532a of the guide portion 532, the flow of the lubricating oil scraped up by the driven sprocket 70 is changed in the direction along the guide portion 532 (in the upper right direction, see arrow A1 in the figure). ) To avoid collision with the lubricating oil flow from the final gear F side (see arrow B in the figure).

In the support member 50, the guide portion 532 is provided so that the gap between the outer periphery of the chain V wound around the drive sprocket 60 and the guide wall 53 becomes narrower toward the downstream side in the rotation direction of the drive sprocket 60. It has been.
Here, if the gap between the outer periphery of the chain V and the guide wall 53 is narrowed toward the downstream side in the rotational direction of the drive sprocket 60, the gap between the outer periphery of the chain V and the guide wall 53 is the narrowest. As the portion (see point P1 in the figure) is approached, the flow rate of the lubricating oil increases. Then, due to the so-called Venturi effect, the pressure on the downstream side (region Y) is lower than the upstream side (region X) rather than the narrowest portion P1, so that the upstream lubricating oil is drawn downstream. become.

In the embodiment, the guide portion 532 is provided so that the intersection angle θ between the guide portion 532 and the straight line Ln (the straight line Ln along the longitudinal direction of the straight portion V1 of the chain V) is smaller than 45 degrees. ing.
If the angle is greater than 45 degrees, the movement of the lubricating oil scraped up by the driven sprocket 70 is blocked by the guiding portion 532, which hinders the guiding of the lubricating oil in the upper right direction in the figure.

  When the angle is less than 45 degrees, the lubricating oil that has been scraped up by the driven sprocket 70 and reaches the region X is quickly drawn into the region Y side through the space between the chain V and the guide wall 53 in combination with the above-described venturi effect. Therefore, it is possible to suitably prevent the lubricant oil from staying in the region X and colliding with the lubricant oil newly scraped up by the driven sprocket 70 and reaching the region X. Therefore, an increase in the air content of the lubricating oil due to the collision can be suitably prevented.

In the embodiment, the width W1 of the narrowest portion P1 in the gap between the outer periphery of the chain V and the guide wall 53 is as follows with respect to the width W2 of the chain V when viewed from the direction of the rotation axis X1. It is set to satisfy (1).
W1: W2 = 1: 1 to 1: 0.6 (1)

  This relationship (1) is set based on the results of experiments and simulations. The width W1 of the narrowest portion P1 in the gap between the chain V and the guide wall 53, and the width W2 of the chain V This relationship is set based on the results when the lubricating oil in the region X is most efficiently discharged to the region Y side.

In the embodiment, instead of the wall portion 106 according to the conventional example, that is, the wall portion 106 that prevents the movement of the lubricating oil scraped up by the driven sprocket 70, the scraped-up lubricating oil is passed diagonally right above the drive sprocket 60. Since the guide wall 53 that guides the oil is provided, the movement of the scraped lubricating oil is not hindered by the guide wall 53.
If the movement of the scavenged lubricating oil is inhibited and stays, the air content of the lubricating oil increases due to the collision between the newly scraped lubricating oil and the stagnant lubricating oil.
As described above, by providing the guide wall 53 along the outer periphery of the chain V wound around the drive sprocket 60, the lubricating oil does not stay in the upper right direction of the drive sprocket 60 (the final gear F is In a direction that avoids interference with the scraped lubricating oil). Therefore, an increase in the air content of the lubricating oil due to the collision can be suitably prevented.

Further, by preventing the increase in the air content of the lubricating oil, the oil level in the transmission case of the lubricating oil that has increased due to the increase in the air content is lowered. As a result, the agitation resistance in the final gear F and the pulley of the continuously variable transmission is reduced, so that an improvement in fuel consumption is expected.
Furthermore, oil vibration caused by an increase in the air content of the lubricating oil is suppressed, so that wear of sliding parts such as valves can be suppressed, and a decrease in hydraulic pressure caused by an increase in the air content of the lubricating oil can be suppressed. Therefore, it is expected to prevent slipping of clutches and pulleys, improve durability, and improve power transmission efficiency.
Further, since the gap between the guide wall 53 and the chain V becomes narrower toward the downstream side in the rotational direction of the drive sprocket 60, the flow rate of the lubricating oil when passing through the gap is increased. Thereby, when passing through the gap, bubbles contained in the lubricating oil are removed, and the bubbles staying in the transmission case are reduced, so that the bubble jet from the breather provided in the transmission case is prevented. Is prevented.

As described above, in the embodiment, the driven sprocket 70 (driven gear) disposed below the drive sprocket 60 (drive side gear) is located in the lubricating oil in the transmission case 10. The rotation of the drive sprocket 60 is configured to be transmitted to the driven sprocket 70 side via the chain V wound around the drive sprocket 60 and the driven sprocket 70, and adjacent to the torque transmission side of the chain V. An induction structure for lubricating oil in an automatic transmission provided with a final gear F,
A guide wall 53 (wall portion) is provided along the outer periphery of the chain V wound around the drive sprocket 60 on the torque transmission side, and a gap between the guide wall 53 and the outer periphery of the chain V is defined in the rotational direction of the drive sprocket 60. The configuration is narrower toward the downstream side.

With this configuration, the lubricating oil scraped up by the driven sprocket 70 passes between the chain V wound around the drive sprocket 60 and the guide wall 53, and reaches the upper side in the transmission case 10. Since it is discharged, the flow of the lubricating oil picked up by the driven sprocket 70 is not hindered.
When the flow of the lubricating oil scraped up by the driven sprocket 70 is obstructed, the lubricating oil whose flow is obstructed falls in the transmission case 10 due to gravity, and the lubricating oil newly picked up by the driven sprocket 70 Since the oil collides with the oil, the lubricating oil contains a large amount of bubbles, but the flow of the lubricating oil picked up by the driven sprocket 70 is not hindered, so it is preferable to prevent the air content of the lubricating oil from increasing. it can.

  In the portion where the gap between the guide wall 53 and the outer periphery of the chain V is the narrowest, the relationship between the gap and the width of the chain V is 1: 0.6 to 1: 1 when viewed from the direction of the rotation axis of the drive side gear. It was set as the configuration set to.

  When this relationship is set, the lubricating oil on the upstream side (region X side) is most efficiently discharged to the downstream side (region Y side) even near the portion P where the gap between the guide wall 53 and the outer periphery of the chain V is the narrowest. Therefore, it is preferable that the lubricating oil that has been scraped up by the driven sprocket 70 and reaches the region X stays in the region X and collides with the lubricating oil that has been newly scraped up by the driven sprocket 70 and reaches the region X. Can be prevented. Therefore, an increase in the air content of the lubricating oil due to the collision can be suitably prevented.

The guide wall 53 is linear from the partition part 531 toward the upper part in the direction away from the final gear F and the partition part 531 (first wall part) extending in the vertical direction between the drive sprocket 60 and the final gear F. A guide portion 532 (second wall portion) extending to
The gap between the guide portion 532 and the chain V is configured to become narrower toward the downstream side in the rotational direction of the drive sprocket 60.

With this configuration, the lubricating oil scraped up by the driven sprocket 70 is guided into the region X by the partition part 531, and the guided lubricating oil flow is guided by the guide part 532 to the outer periphery of the chain V and the guide part. Instead of the flow toward the gap between the 532 and 532, the lubricating oil can be discharged in a direction away from the final gear F from the gap (in the figure, diagonally upward to the right).
Therefore, it is possible to quickly discharge the lubricating oil from the region X while preventing the lubricating oil scraped up by the driven sprocket 70 from flowing into the final gear F side.
In particular, since the lubricating oil induced in the region X does not stay in the region X, the lubricating oil staying in the conventional manner collides with the newly-spiked lubricating oil, and the air content of the lubricating oil is reduced. There is no increase.

  At this time, the upper end portion 532a of the guide portion 532 is located on an extension of the straight portion V1 on the torque transmission side in the chain V wound around the drive sprocket 60 and the driven sprocket 70, and the longitudinal portion of the straight portion V1 If the crossing angle between the straight line Ln along the direction and the guide portion 532 is set to be smaller than 45 degrees, the flow of the lubricating oil scraped up by the driven sprocket 70 is not hindered by the guide portion 532, The direction is changed to the direction along the guide portion 532 (upwardly to the right, see arrow A1 in the figure). Therefore, the driven sprocket 70 is used to change the direction to avoid the collision with the lubricating oil flow from the final gear F side (see arrow B in the figure) and to avoid the collision with the lubricating oil. The raised lubricating oil can be quickly guided.

  In addition, since the guide wall 53 is formed on the support member 50, it is not necessary to provide an extra mounting portion in the transmission case 10, and an increase in the number of parts can be suitably prevented.

  Further, the support member 50 has a plate-like base 51 that is orthogonal to the rotational axis direction of the drive sprocket 60, and the upper surface 510 on the side of the base 51 where the guide wall 53 is provided in the rotational axis direction. And the chain V wound around the outer periphery of the drive sprocket 60, the lubricating oil scooped up by the driven sprocket 70 is outside the radial direction of the chain V (guide wall 53 side). ) As well as moving through the sides. As a result, the lubricating oil flows from the final gear F side (see arrow B in the figure) more quickly than when the lubricating oil movement path is secured only on the radially outer side of the chain V. Can be guided in a direction to avoid collision with

DESCRIPTION OF SYMBOLS 10 Transmission case 12 Partition wall 20 Storage part 21 Mounting part 24 Boundary part 25 Support part 30 Valve storage part 40 Differential chamber 50 Support member 51 Base part 51a Through-hole 51b Insertion hole 52 Peripheral wall 53 Guide wall 60 Drive sprocket 70 Driven sprocket 80 Rotation Transmission mechanism 100 Transmission case 101 Rotation transmission mechanism 102 Drive sprocket 103 Driven sprocket 104 Chain 105 Support member 106 Wall portion 107 Partition wall 510 Upper surface 531 Partition portion 532 Guide portion 532a Upper end portion 532b Lower end B Arrow in the figure F Final gear V Chain

Claims (9)

A driven gear disposed below the drive side gear is located in the lubricating oil in the transmission case, and the rotation of the drive side gear causes the drive side gear and the driven side gear to rotate. Induction of lubricating oil in an automatic transmission which is configured to be transmitted to the driven gear via a chain wound around the chain and provided with a rotating body adjacent to the torque transmission side of the chain Structure,
A wall is provided along the torque transmission side of the chain,
The wall is
A first wall portion extending vertically between the drive-side gear and the rotating body;
A second wall portion extending linearly from the first wall portion in a direction away from the rotating body,
The second wall portion is
A structure for guiding lubricating oil in an automatic transmission , wherein a gap between the chain and the chain is arranged to become narrower toward a downstream side in a rotation direction of the gear on the drive side . In the portion where the gap between the second wall portion and the chain is the narrowest, the relationship between the gap and the width of the chain is 1: 0. 2. The structure for guiding lubricating oil in an automatic transmission according to claim 1, wherein the structure is set to 6 to 1: 1. The crossing angle of the second wall portion with respect to a straight portion between the drive-side gear and the driven-side gear in the chain is set to an angle smaller than 45 degrees. An induction structure for lubricating oil in the automatic transmission according to claim 1 or 2. The said wall part is formed in the supporting member which supports the gear of the said drive side rotatably while being fixed to the said transmission case, The Claim 1 characterized by the above-mentioned. Guide structure for lubricating oil in the automatic transmission described. The support member is
It has a plate-like base that is orthogonal to the rotational axis direction of the drive side gear,
5. A clearance is provided between a surface of the base portion where the wall portion is provided in the rotation axis direction and the chain wound around the gear on the drive side. A structure for guiding lubricating oil in the automatic transmission according to claim 1. A driven gear disposed below the drive side gear is located in the lubricating oil in the transmission case, and the rotation of the drive side gear causes the drive side gear and the driven side gear to rotate. Induction of lubricating oil in an automatic transmission which is configured to be transmitted to the driven gear via a chain wound around the chain and provided with a rotating body adjacent to the torque transmission side of the chain Structure,
A wall is provided along the torque transmission side of the chain,
The wall is
The gap between the chain and the chain is arranged so as to become narrower toward the downstream side in the rotational direction of the drive side gear,
A structure for guiding lubricating oil in an automatic transmission, wherein the lubricating oil induction structure is formed on a support member fixed to the transmission case and rotatably supporting a gear on the drive side. In the portion where the gap between the wall portion and the chain is the narrowest, the relationship between the gap and the width of the chain is 1: 0.6 to 1 when viewed from the direction of the rotation axis of the gear on the drive side. 7. The structure for guiding lubricating oil in an automatic transmission according to claim 6, wherein the structure is set to 1. The wall is
A first wall portion extending vertically between the drive-side gear and the rotating body;
A second wall portion extending linearly from the first wall portion in a direction away from the rotating body,
The second wall portion is
  The gap between the chain and the chain is arranged so as to narrow toward the downstream side in the rotational direction of the drive side gear,
The automatic transmission according to claim 6, wherein an intersection angle with respect to a straight portion between the drive-side gear and the driven-side gear in the chain is set to an angle smaller than 45 degrees. Lubricating oil induction structure. The support member is
It has a plate-like base that is orthogonal to the rotational axis direction of the drive side gear,
7. A clearance is provided between a surface of the base portion on the side where the wall portion is provided and the chain wound around the drive-side gear in the rotation axis direction. A structure for guiding lubricating oil in the automatic transmission according to claim 1.

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