Automatic transmission

Abstract

An automatic transmission, wherein a baffle (4) for limiting the movement of lubricating oil (OL) stirred by the driven sprocket (32) is provided on a side where an oil pump (OP) is located in the direction of a rotation axis (X2) of a driven sprocket (32), wherein the structure is such that, when viewed from the direction of the rotation axis (X2), a dividing wall (52) arranged to cross the chain (33) is arranged in a manner to reach closer to the chain (33) than a base (40) of the baffle (4), and when viewed from the direction of the rotation axis (X2), a guide wall (61) extending along the chain (33A) on the torque transmission side of the chain (33) wound on the driven sprocket (32) is provided on the baffle (4), and in the direction of the rotation axis (X2), the guide wall (61) has an inclined portion (611) inclined in a direction approaching the chain (33) as it moves toward the front end side.

Description

[0001] This application is a divisional application of the Chinese invention patent application filed on February 10, 2017, with application number 201780016702.0, and invention name “Lubricating oil guiding structure in automatic transmission”, and the applicants are JATCO Co., Ltd. and Nissan Motor Co., Ltd. Technical Field

[0002] The present invention relates to an automatic transmission. Background Art

[0003] like Figure 4 As shown in FIG. 1 , in an automatic transmission for a vehicle, there is a structure in which an oil pump OP is arranged at a position separated from the input shaft 110 .

[0004] The above-mentioned automatic transmission with an oil pump OP has a rotation transmission mechanism 100, which has: a driving sprocket 101 rotated by the rotational driving force of the engine, a driven sprocket 102 arranged on the rotating shaft of the oil pump OP, and a chain 103 wound around the driving sprocket 101 and the driven sprocket 102. The oil pump OP is driven by the rotational driving force transmitted via the rotation transmission mechanism 100.

[0005] Here, if the driven sprocket 102 of the rotation transmission mechanism 100 is disposed on the lower side of the transmission case and is located in the lubricating oil OL, when the oil pump OP is driven, the lubricating oil OL in the transmission case is splashed by the driven sprocket 102 .

[0006] The lubricating oil OL splashed by the driven sprocket 102 contains a large number of bubbles. Therefore, when the lubricating oil OL containing a large number of bubbles directly moves into the oil pan fixed at the lower part of the transmission case, the lubricating oil OL containing a large number of bubbles is sucked into the oil filter arranged in the oil pan.

[0007] Therefore, generally, a baffle plate 104 is provided between the driven sprocket 102 and the oil pump OP to restrict the movement of the lubricating oil OL containing a large number of bubbles toward the oil pan. An example of providing such a baffle plate is disclosed in, for example, Patent Document 1.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2000-199436

[0011] In the transmission case, other rotating elements (for example, a planetary gear mechanism) are arranged adjacent to the drive sprocket 101. When the oil pump OP is arranged in the space S radially outside the dividing wall 106 surrounding the periphery of the other rotating elements, the baffle 104 is also arranged in the space S, and the setting range of the components of the rotation transmission mechanism 100 in the direction of the rotation axis will not be expanded.

[0012] Here, when the oil pump OP is driven, the lubricating oil OL splashed up by the driven sprocket 102 moves toward the driving sprocket 101 side between the chain 103 and the retainer 104 along the chain 103 on the torque transmission side.

[0013] However, when the baffle 104 is set in the space S, when viewed from the direction of the rotation axis X2, the dividing wall 106 arranged in a direction transverse to the chain 103 prevents the lubricating oil OL moving along the baffle 104 from moving toward the driving sprocket 101 side. Therefore, the splashed lubricating oil OL flows into the oil pump OP side through the dividing wall 106 and the baffle 104, and then moves downward to the oil pan side.

[0014] Therefore, in order to control the moving direction of the splashed lubricating oil OL, a rubber sealing plate 107 that fills the gap with the dividing wall 106 is set on the baffle 104, but the rubber sealing plate 107 is expensive, and in order to attach the sealing plate 107 to the steel baffle 104, operating costs are required.

[0015] Therefore, it is required to be able to control the moving direction of lubricating oil containing air bubbles with a more inexpensive structure. Summary of the invention

[0016] The present invention is a lubricating oil guiding structure in an automatic transmission, wherein the rotation transmission between the driving side gear and the driven side gear is carried out via a chain wound around the driving side gear and the driven side gear, and a baffle is provided on one side in the direction of the rotation axis of the driven side gear for limiting the movement of the lubricating oil stirred by the driven side gear to the said one side, wherein the structure is such that, when viewed from the direction of the rotation axis, a partition wall is provided on the driving side gear side of the baffle, and in the direction of the rotation axis, the partition wall is provided in a manner to reach closer to the chain than the baffle, and when viewed from the direction of the rotation axis, a wall portion is provided on the baffle extending toward the driving side gear side along the torque transmission side of the chain wound around the driven side gear, and in the direction of the rotation axis, the wall portion is inclined in a direction approaching the chain as it approaches the front end side.

[0017] When the rotation is transmitted between the driving side gear and the driven side gear via the chain, the lubricating oil splashed up by the driven side gear moves toward the driving side gear along the chain on the torque transmission side.

[0018] With the above configuration, the movement direction of the lubricating oil moving along the chain on the torque transmission side is changed by the inclined portion, and the lubricating oil is guided between the driving side gear and the partition wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram for explaining a lubricating oil guide structure according to an embodiment;

[0020] Figure 2 is a diagram illustrating a baffle and a guide member;

[0021] Figure 3 is a diagram illustrating a lubricating oil guide structure according to a modified example;

[0022] Figure 4 It is a diagram for explaining the arrangement around the baffle plate of a conventional example. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present invention will be described.

[0024] Figure 1 The figures illustrate the guide structure 1 of the lubricating oil OL in the automatic transmission, (a) is an enlarged view around the driven sprocket 32, (b) is a diagram schematically showing the A-A section of (a), and is a diagram illustrating the flow of the lubricating oil OL splashed by the driven sprocket 32 ​​and toward the driving sprocket 31 side, and (c) is an enlarged view of area B of (b).

[0025] also, Figure 1 In (a), in order to clarify the position of the partition wall 52, the region of the partition wall 52 is shaded.

[0026] Figure 2 1 and 2 are diagrams for explaining the baffle plate 4 and the guide member 6 . (a) is a diagram for explaining the flow of the lubricating oil OL around the guide wall 61 of the guide member 6 , and (b) is a perspective view of the guide member 6 .

[0027] like Figure 1 As shown in (b) of FIG. 1 , inside a transmission case of an automatic transmission for a vehicle, an oil pump OP is located radially outside an input shaft 2 to which output rotation of a torque converter (not shown) is input.

[0028] The oil pump OP is driven by a rotational driving force transmitted via a rotation transmission mechanism 3 including a drive sprocket 31 rotating about a rotation axis X1 , a driven sprocket 32 ​​rotating about a rotation axis X2 parallel to the rotation axis X1 , and a chain 33 wound around the drive sprocket 31 and the driven sprocket 32 ​​.

[0029] The drive sprocket 31 is connected to a pump impeller sleeve 21 extending from a torque converter (not shown) and rotates about a rotation axis X1 by a rotational driving force input from a driving source (eg, an engine) via the pump impeller sleeve 21 .

[0030] The rotation input to the driving sprocket 31 is transmitted to the driven sprocket 32 ​​via the chain 33 . When the driven sprocket 32 ​​rotates about the rotation axis X2 due to the transmitted rotation, the rotation axis of the oil pump OP connected to the driven sprocket 32 ​​rotates, thereby driving the oil pump OP.

[0031] Inside the transmission case, other rotating elements (for example, a planetary gear mechanism) and the like are provided adjacent to the drive sprocket 31 , and a partition wall 51 through which the input shaft 2 penetrates is located between the other rotating elements and the drive sprocket 31 .

[0032] A partition wall 52 surrounding the periphery of other rotating elements is connected to the outer diameter side of the partition wall 51 with reference to the rotation axis X1 , and a space S in which the oil pump OP is installed is formed on the radially outer side of the partition wall 52 .

[0033] In the transmission case, this space S is located on the lower side where the lubricating oil OL is stored, and the oil pump OP and the driven sprocket 32 ​​are located in the lubricating oil OL.

[0034] Therefore, when the oil pump OP is driven, the driven sprocket 32 ​​rotating about the rotation axis X2 splashes the lubricating oil OL.

[0035] like Figure 1 As shown in (a), in the embodiment, the driven sprocket 32 ​​only rotates in the clockwise direction in the figure (in the figure, the arrow CW direction), and the chain 33 wound on the driving sprocket 31 and the driven sprocket 32 ​​moves in the clockwise direction in the figure and transmits the rotation of the driving sprocket 31 to the driven sprocket 32 ​​side.

[0036] Here, Figure 1 In (a), with respect to the chain 33 wound on the driven sprocket 32, the left side of the figure where the final gear F is located is the chain 33A on the torque transmission side (tension side), and the right side is the chain 33B on the torque non-transmission side (slack side).

[0037] In the following description, when there is no particular distinction between these chains 33A and 33B, they are simply referred to as the chain 33 .

[0038] like Figure 1 As shown in (b) of FIG. 1 , a baffle 4 for adjusting the moving direction of the lubricating oil OL splashed by the driven sprocket 32 ​​is provided between the driven sprocket 32 ​​and the oil pump OP.

[0039] The baffle plate 4 has a plate-shaped base portion 40 disposed in a direction perpendicular to the rotation axis X2, and is located in the same space S as the oil pump OP.

[0040] The base 40 of the baffle plate 4 has an area covering a range larger than the outer diameter of the chain 33 wound around the driven sprocket 32 ​​when viewed from the direction of the rotation axis X2 in order to prevent the lubricating oil OL splashed by the driven sprocket 32 ​​from moving toward the oil pump OP (see FIG. Figure 2 (a)).

[0041] The base portion 40 is provided with an arc-shaped partition wall 41 surrounding the outer periphery of the final gear F at a predetermined interval on the outer side of the chain 33A on the torque transmission side with reference to the rotation axis X2.

[0042] The partition wall 41 is formed by making a part of the base 40 face Figure 2 The baffle plate 4 is formed to extend in front of the paper surface in (a), and the area on the opposite side of the oil pump OP in the direction of the rotation axis X2 is divided into an area where the driven sprocket 32 ​​is provided and an area where the final gear F is provided by a partition wall 41.

[0043] Therefore, the lubricating oil OL splashed by the driven sprocket 32 ​​is moved along the partition wall 41 to the drive sprocket 31 side together with the chain 33A moving toward the drive sprocket 31 side. Figure 2 Move to the upper side of (a).

[0044] like Figure 1 As shown in (b) of FIG. 1 , the baffle plate 4 is located in the space S outside the partition wall 52 , and the partition wall 52 is provided so as to reach the chain 33 side (right side in the figure) rather than the baffle plate 4 .

[0045] Therefore, the end surface 52a of the partition wall 52 facing the chain 33 is located closer to the chain 33 than the base 40 of the baffle 4 , and the gap W1 between the end surface 52a of the partition wall 52 and the chain 33 is narrower than the gap W2 between the base 40 of the baffle 4 and the chain 33 .

[0046] Here, when viewed from the direction of the rotation axis X2, the partition wall 52 is provided so as to cross the chain 33 (see Figure 1 (a)), the outer periphery 52b of the partition wall 52 is located radially outside the baffle 4 with respect to the rotation axis X2 (refer to Figure 1 (b), (c)).

[0047] Therefore, the outer periphery 52b of the dividing wall 52 is located at a position transverse to the moving direction of the lubricating oil OL splashed by the driven sprocket 32 ​​and moving toward the driving sprocket 31 side. In an embodiment, in order to prevent the movement of the lubricating oil OL from being hindered by the outer periphery 52b of the dividing wall 52, a guide component 6 for guiding the movement of the lubricating oil OL is provided on the baffle 4.

[0048] like Figure 2As shown in (b), in the guide component 6, a guide wall 61 for the lubricating oil OL is provided on one side of the long side direction of the plate-shaped connecting portion 60, and the guide wall 61 is composed of an inclined portion 611 inclined at a predetermined angle relative to the connecting portion 60 and a flat portion 612 parallel to the connecting portion 60.

[0049] like Figure 2 As shown in (a), when viewed from the direction of the rotation axis X2, the guide wall 61 extends along the chain 33A on the torque transmission side in the direction away from the connecting portion 60 (in the direction approaching the drive sprocket 31), and is set in a manner such that an imaginary line Ln along the connection direction of the chain 33 is located approximately in the center of the width direction of the guide wall 61. Thus, the chain 33 and the guide wall 61 are configured so that the positions of the chain 33 and the guide wall 61 overlap when viewed from the direction of the rotation axis X2.

[0050] When viewed from the direction of the rotation axis X2 , the width of the inclined portion 611 becomes narrower as it moves away from the connecting portion 60 , and the flat portion 612 extending from the front end of the inclined portion 611 is formed to have a substantially uniform width in the direction away from the connecting portion 60 .

[0051] The guide wall 61 is provided to avoid interference with the partition wall 52, and a small gap Sa is ensured between the guide wall 61 and the outer periphery 52b of the partition wall 52 (see Figure 1 (c)).

[0052] The inclined portion 611 is inclined toward the chain 33 as it moves away from the connecting portion 60 , and the gap between the flat portion 612 extending from the front end of the inclined portion 611 and the chain 33 is substantially the same as the gap W1 between the end surface 52a of the partition wall 52 and the chain 33 .

[0053] Furthermore, if Figure 2 As shown in (b) , a stopper wall 62 that is bent in the same direction as the guide wall 61 is provided at the side edge of the connecting portion 60 where the guide wall 61 is located.

[0054] A cutout portion 621 is provided at a midway position in the longitudinal direction of the blocking wall 62. The cutout portion 621 is provided to prevent the blocking wall 62 from interfering with the fixing member 45 (see FIG. 4 ) fixing the baffle plate 4 to the partition wall 52. Figure 1 (a)) is set to prevent interference.

[0055] like Figure 1 As shown in (c), in the direction of the rotation axis X2, the blocking wall 62 is arranged to reach the vicinity of the chain 33 closer than the dividing wall 52, as shown in FIG. Figure 1 As shown in FIG. 5A , the blocking wall 62 is provided along the partition wall 52 between the chain 33A on the torque transmission side and the chain 33B on the torque non-transmission side of the chain 33 wound around the driven sprocket 32 ​​, as viewed from the rotation axis X2 direction.

[0056] Therefore, in the region of the partition wall 52 where the prevention wall 62 is provided, the lubricating oil OL splashed up by the driven sprocket 32 ​​is prevented from moving toward the driving sprocket 31 side by the prevention wall 62 .

[0057] Next, the operation of the lubricating oil guide structure 1 having the above-mentioned structure will be described.

[0058] When the oil pump OP is driven, the driven sprocket 32 ​​rotates about the rotation axis X2, and the lubricating oil OL in the transmission case is splashed.

[0059] Therefore, the base 40 of the baffle 4 is located on the oil pump OP side of the driven sprocket 32, and the base 40 is provided with a partition wall 41 surrounding the outer periphery of the final gear F on the radial outside of the driven sprocket 32, so that the splashed lubricating oil OL moves toward the driving sprocket 31 side along the chain 33A on the torque transmission side.

[0060] Here, the baffle plate 4 is located in the space S outside the partition wall 52 based on the rotation axis X1. Therefore, the outer periphery 52b of the partition wall 52 is located across the movement direction of the lubricating oil OL moving along the chain 33A on the torque transmission side.

[0061] Therefore, on the baffle 4, when viewed from the direction of the rotation axis X2, a guide wall 61 is arranged at a position overlapping with the chain 33A, and on the guide wall 61, an inclined portion 611 is provided which is inclined in a direction in which the gap with the chain 33 in the direction of the rotation axis X2 becomes narrower as it moves away from the baffle 4 and toward the dividing wall 52.

[0062] Therefore, the lubricating oil OL moving along the chain 33A changes its traveling direction in the guide wall 61 by the inclined portion 611, changing from a direction colliding with the outer periphery 52b of the partition wall 52 to a direction approaching the chain 33A, and is finally guided to the gap between the drive sprocket 31 and the partition wall 52.

[0063] Furthermore, a flat portion 612 parallel to the chain 33A is provided adjacent to the inclined portion 611 , and the traveling direction of the lubricating oil OL changed by the inclined portion 611 is changed to a direction along the moving direction of the chain 33A when passing through the flat portion 612 .

[0064] Furthermore, since the gap between the flat portion 612 and the chain 33A is the same as the gap between the end surface 52a of the partition wall 52 and the chain 33A, the lubricating oil OL passing through the guide wall 61 smoothly flows into the gap between the end surface 52a of the partition wall 52 and the chain 33A.

[0065] Furthermore, even if there is a gap between the flat portion 612 and the partition wall 52 , the opening direction of the gap is approximately orthogonal to the movement direction of the lubricating oil OL. Therefore, the lubricating oil OL does not flow into the gap between the flat portion 612 and the partition wall 52 in large quantities, but moves toward the drive sprocket 31 side.

[0066] Moreover, the lubricating oil that reaches the drive sprocket 31 side along the chain 33A eventually moves from the chain 33B on the non-torque transmission side to the lower side of the oil pan, but the bubbles contained therein decrease in the process until reaching the oil pan, and therefore, the bubble content in the lubricating oil OL sucked from the oil filter in the oil pan decreases.

[0067] Furthermore, part of the lubricating oil that does not move along the chain 33A but travels in a direction that collides with the partition wall 52 between the chain 33A and the chain 33B collides with the stopper wall 62 that reaches a height closer to the chain 33 than the partition wall 52 .

[0068] Therefore, the lubricating oil OL containing a large number of bubbles can be prevented from flowing into the oil pump OP side of the baffle plate 4 through the gap Sa between the baffle plate 4 and the outer periphery 52b of the partition wall 52 in the area between the chain 33A on the torque transmission side and the chain 33B on the torque non-transmission side. Thus, the lubricating oil OL containing a large number of bubbles can be appropriately prevented from moving from the oil pump OP side to the oil pan side and being sucked into the oil filter.

[0069] As described above, in the embodiment, (1) a lubricating oil guiding structure 1 in an automatic transmission, the rotation between the driving sprocket 31 (driving side gear) and the driven sprocket 32 ​​(driven side gear) is transmitted via a chain 33 wound around the driving sprocket 31 and the driven sprocket 32, and a baffle 4 is provided on the side where the oil pump OP is located in the direction of the rotation axis X2 of the driven side gear 32, which restricts the movement of the lubricating oil OL stirred by the driven side gear 32 to one side, wherein the baffle 4 is configured such that, when viewed from the direction of the rotation axis X2, the lubricating oil OL stirred by the driven side gear 32 is not moved to one side. A partition wall 52 is provided on the side of the driving sprocket 31. In the direction of the rotation axis X2, the end face 52a of the partition wall 52 is provided closer to the chain 33 than the base 40 of the baffle plate 4. When viewed from the direction of the rotation axis X2, a guide wall 61 (wall portion) is provided on the baffle plate 4, extending toward the driving sprocket 31 along the chain 33A on the torque transmission side of the chain 33 wound on the driven side gear 32. In the direction of the rotation axis X2, the guide wall 61 has an inclined portion 611 which is inclined in a direction approaching the chain 33 as it moves toward the front end side of the extension direction.

[0070] When the rotation is transmitted between the driving sprocket 31 and the driven sprocket 32 ​​via the chain 33 , the lubricating oil OL splashed up by the driven sprocket 32 ​​moves toward the driving sprocket 31 side along the chain 33A on the torque transmission side.

[0071] When constructed as described above, the moving direction of the lubricating oil OL moving along the chain 33A on the torque transmission side is changed by the inclined portion 611, from the direction of colliding with the outer periphery 52b of the dividing wall 52 to the direction approaching the chain 33A, and finally guided to the gap between the drive sprocket 31 and the dividing wall 52.

[0072] Thus, without sealing the gap Sa between the baffle 4 and the dividing wall 52 with a rubber sealing material, the lubricating oil OL containing bubbles can be prevented from moving toward the oil pan through the gap Sa. Therefore, it is cheaper and simpler to prevent the lubricating oil OL containing bubbles from moving toward the oil pan, and at the same time, the moving direction of the lubricating oil OL can be controlled.

[0073] (2) The structure is such that the gap between the front end of the inclined portion 611 in the extending direction (the boundary with the flat portion 612) in the direction of the rotation axis X2 and the chain 33 and the gap W1 between the end surface 52a of the partition wall 52 in the direction of the rotation axis X2 and the chain 33 are set to be equal.

[0074] Here, the term "equal" used in the request scope description does not mean that the gap between the front end of the inclined portion 611 in the extension direction in the direction of the rotation axis X2 (the boundary with the flat portion 612) and the chain 33 and the gap W1 between the end face 52a of the dividing wall 52 in the direction of the rotation axis X2 and the chain 33 are strictly the same (equal).

[0075] This includes design errors, manufacturing errors, and slight deviations caused by the arrangement of the baffle 4 and the guide wall 61, and therefore should be interpreted as a term of “substantially the same”.

[0076] With this configuration, the lubricating oil OL splashed up by the driven sprocket 32 ​​can be appropriately guided to the driving sprocket 31 side.

[0077] (3) The guide wall 61 is configured such that the flat portion 612 and the inclined portion 611 are continuously provided at the front end of the guide wall 61 in the extending direction.

[0078] In the case where the flat portion 612 is not provided, the gap with the chain 33 becomes wider at the time point when the front end of the inclined portion 611 is passed. Therefore, the flow of the lubricating oil OL moving toward the drive sprocket 31 is diffused at the time point when the front end of the inclined portion 611 is passed, and therefore, a part of the lubricating oil OL flows into the gap between the base 40 of the baffle 4 and the partition wall 52.

[0079] In contrast, when the flat portion 612 is provided, the flow direction of the diffused lubricating oil OL is guided in the direction of the flat portion 612. Therefore, even if there is a gap Sa between the flat portion 612 and the outer periphery 52b of the dividing wall 52, the lubricating oil OL will not flow in in large quantities. Therefore, there is no need to additionally prepare a rubber sealing material of a complex shape and seal the gap Sa with the sealing material.

[0080] In particular, in the embodiment, with the gap Sa remaining between the flat portion 612 of the baffle plate 4 and the outer periphery 52 b of the partition wall 52 , the moving direction of the lubricating oil OL is controlled by the guide wall 61 so as to cross the gap Sa.

[0081] Therefore, when the lubricating oil OL on the driving sprocket 31 side moves downward toward the driven sprocket 32 ​​side due to its own weight, the lubricating oil OL moved due to its own weight can be returned to the oil pan side through the gap Sa.

[0082] Therefore, the return performance of the lubricating oil OL to the oil pan, which is poor due to low viscosity, especially at extremely low temperatures, can be improved.

[0083] (4) The structure is such that a preventing wall 62 adjacent to the guide wall 61 and inclined in the same direction as the guide wall 61 is also provided on the baffle plate 4, and when viewed from the direction of the rotation axis X2, the preventing wall 62 is provided between the chain 33A on the torque transmission side on one side of the chain 33 wound on the driven sprocket 32 ​​and the chain 33B on the other side, along the dividing wall 52 provided transversely to the chain 33, and in the direction of the rotation axis X2, the preventing wall 62 is provided closer to the chain 33 than the dividing wall 52.

[0084] With this configuration, the lubricating oil OL can be prevented from flowing into the gap Sa between the baffle plate 4 and the partition wall 52 in the region between the chain 33A on one torque transmission side of the chain 33 wound around the driven sprocket 32 ​​and the chain 33B on the other side.

[0085] (5) The guide wall 61 and the stopper wall 62 are integrally provided with the plate-shaped connecting portion 60 of the guide member 6 provided separately from the baffle plate 4 , and the guide member 6 is connected to the baffle plate 4 by connecting the connecting portion 60 to the surface of the baffle plate 4 on the oil pump OP side.

[0086] According to this configuration, the guide wall 61 for the lubricating oil OL can be provided without changing the shape of the existing baffle plate 4 . Therefore, the existing baffle plate 4 can be used as it is to provide the guide wall 61 .

[0087] In the above-mentioned embodiment, the guide member 6 provided separately from the baffle plate 4 is provided with the guide wall 61 and the stop wall 62. However, for example, Figure 3As shown, a structure in which both or at least one of the guide wall 46 and the stopper wall 47 are provided integrally with the baffle plate 4 may be adopted.

[0088] That is, (5) at least the guide wall 61 may be formed integrally with the baffle plate 4 .

[0089] In this configuration, when the baffle is produced by punching a metal plate, the region to be the wall portion is also produced at the same time, so the wall portion can be produced with good positional accuracy. In addition, when the wall portion is provided separately from the baffle, positioning of the wall portion is required, and the cost of attaching the wall portion to the baffle is increased, but when the baffle is provided integrally, the cost of attaching the wall portion to the baffle can be reduced.

Claims

1. An automatic transmission, comprising: Drive side gear; Driven side gear; a chain wound around the driving side gear and the driven side gear; a partition wall connected to the outer diameter side of the partition wall between the drive side gear and other rotating elements; a baffle plate disposed on one side in the direction of the rotation axis of the driven side gear and restricting or regulating the movement of the lubricating oil stirred by the driven side gear to the one side, The guard has a base covering a larger area than the outer diameter of the chain, When viewed from the rotation axis direction of the driven side gear, the chain is located on the front side of the base of the baffle. When viewed from the rotation axis direction of the driven side gear, the end surface of the partition wall is located on the front side of the base of the baffle plate. The baffle plate includes a wall portion extending from a base portion of the baffle plate toward a front side of the base portion when viewed in the rotation axis direction of the driven side gear.

2. The automatic transmission according to claim 1, wherein: When a direction extending from a base of the baffle toward a front side of the base is defined as a front end direction, the wall portion has a shape in which a width gradually narrows toward the front end.

3. The automatic transmission according to claim 1 or 2, wherein: The baffle has a partition wall portion, The partition wall portion has a portion located between the chain and the final gear when viewed from the rotation axis direction of the driven side gear. The wall portion has a portion located between the chain and the final gear when viewed from the rotation axis direction of the driven-side gear.

4. The automatic transmission according to claim 1 or 2, wherein: The wall portion has a flat portion at an end portion extending from a base portion of the baffle toward a front side of the base portion.

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