JP2017223290A - Lubrication structure in friction fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly lubricate drive plates and driven plates.SOLUTION: A lubrication structure in a forward clutch includes: drive plates 21 splined to an outer periphery of a peripheral wall part 241 of a clutch hub 24; driven plates 22 splined to an inner periphery of a peripheral wall part 251 of a clutch drum 25; and a piston 23 which presses the drive plates 21 and the driven plates 22, which are alternately disposed in a rotation axis X direction, in the rotation axis X direction. The piston 23 is configured to press areas, in which the outer diameter side of the drive plate 21 and the inner diameter side of the driven plate 22 are overlapped with each other when viewed in the rotation axis X direction, in the rotation axis X direction. An inner periphery part of the driven plate 22 is provided with taper parts 222, 222 at which a thickness measured in the rotation axis X direction narrows toward the inner periphery side.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lubricating structure in a friction fastening device.

  Patent Document 1 discloses a lubricating structure in a friction fastening device.

JP-A-2015-175456

In the friction fastening device of Patent Document 1, a drive plate that is spline-fitted to the outer periphery of the annular wall of the inner-diameter side rotating body and a driven plate that is spline-fitted to the inner periphery of the annular wall of the outer-diameter side rotating body are Alternatingly arranged in the direction.
In this friction fastening device, a hydraulically actuated piston presses the drive plate and the driven plate in the direction of the rotation axis to fasten the drive plate and the driven plate so that they cannot be rotated relative to each other. The transmission / non-transmission of the rotational driving force between the side and the downstream side can be switched.

Here, when switching between transmission / non-transmission of rotational driving force, the state of the drive plate and the driven plate is switched between the fastening state and the release state, so the drive plate and the driven plate are temporarily It generates heat in a slip state.
Therefore, in the friction fastening device of Patent Document 1, the lubricating oil supplied from the inner diameter side is guided to the drive plate and the driven plate, and the drive plate and the driven plate are cooled with the lubricating oil.

  Specifically, a through hole is provided in the annular wall of the inner diameter side rotator to guide the lubricating oil supplied from the inner diameter side to the space where the drive plate and the driven plate are located, and at the inner periphery of the drive plate. The drive plate and the driven plate that are adjacent in the rotation axis direction are provided by providing a wedge portion whose thickness in the rotation axis direction becomes thinner toward the inner peripheral side, and changing the traveling direction of the lubricating oil that has passed through the through hole at the wedge portion. And is in between.

  However, in the friction fastening device of Patent Document 1, the inner peripheral side of the drive plate is spline-fitted to the outer periphery of the annular wall of the inner diameter side rotating body, and a wedge portion is provided on the inner peripheral side of the drive plate. . Therefore, when the drive plate and the driven plate are switched between the fastened state and the open state, when the drive plate is displaced in the radial direction of the rotating shaft, the wedge portion comes into contact with the outer periphery of the annular wall, There is a risk of damaging the outer periphery.

  Therefore, it is required to properly lubricate the drive plate and the driven plate without causing such inconvenience.

The present invention
A drive plate that is spline-fitted to the outer periphery of the annular wall of the inner diameter side rotor,
A driven plate that is spline-fitted to the inner circumference of the annular wall of the outer diameter side rotor,
A piston that presses drive plates and driven plates alternately arranged in the rotation axis direction in the rotation axis direction;
The piston is a lubricating structure in a friction fastening device configured to press in the direction of the rotation axis the overlapping areas of the outer diameter side of the drive plate and the inner diameter side of the driven plate when viewed from the rotation axis direction,
A tapered portion whose thickness in the rotation axis direction becomes narrower toward the inner peripheral side is provided on the inner peripheral portion of the driven plate.

According to the present invention, the driven plate is provided by spline fitting the outer peripheral portion of the driven plate to the inner periphery of the annular wall of the outer diameter side rotating body, and the driven plate is displaced in the radial direction of the rotating shaft. Even so, the inner peripheral portion provided with the tapered portion does not interfere with the annular wall of the inner diameter side rotating body.
Therefore, when configured as described above, even if the driven plate is displaced in the radial direction of the rotating shaft, the inner peripheral portion provided with the tapered portion does not interfere with other components located on the inner diameter side of the driven plate. The drive plate and the driven plate can be properly lubricated without damaging other components by the inner peripheral portion provided with the tapered portion.

It is a figure explaining the structure around the clutch of the forward / reverse switching mechanism employing the lubricating structure according to the embodiment. It is a disassembled perspective view of the forward clutch of the forward / reverse switching mechanism that employs the lubrication structure according to the embodiment. It is a schematic diagram explaining the lubricating structure concerning embodiment.

Hereinafter, the case where the embodiment of the present invention is applied to the lubrication structure 1 in the forward / reverse switching mechanism 5 of the automatic transmission for a vehicle will be described as an example.
FIG. 1 is a diagram illustrating a configuration around a clutch (forward clutch 2 and reverse brake 3) of a forward / reverse switching mechanism 5 that employs a lubricating structure 1 according to an embodiment.
FIG. 2 is an exploded perspective view of the clutch drum 25 and the clutch hub 24 of the forward clutch 2 and shows a state in which a plurality of drive plates 21 and driven plates 22 are spline-fitted to the clutch hub 24. Yes.

  As shown in FIG. 1, the frictional engagement elements of the forward / reverse switching mechanism 5 are the forward clutch 2 that directly connects the sun gear 41 of the planetary gear set 4 and the carrier 44, and the reverse brake 3 that fixes the ring gear 43. The forward / reverse switching mechanism 5 outputs the rotational driving force input from an engine (drive source) (not shown) as it is when the forward clutch 2 is engaged, and outputs the rotational driving force reversely when the reverse brake 3 is engaged. It is supposed to be.

The forward clutch 2 and the reverse brake 3 are located between the front cover portion 11 of the transmission case 10 and the planetary gear set 4 inside the transmission case 10.
The reverse brake 3 is located on the outer diameter side of the forward clutch 2, a driven plate 32 that is spline-fitted to the inner periphery of the transmission case 10, a drive plate 31 that is spline-fitted to the outer periphery of the clutch drum 25, A piston 33 that strokes in the axial direction of the rotation axis X (hereinafter referred to as the rotation axis X direction) by hydraulic pressure.

The clutch drum 25 has a cylindrical peripheral wall portion 251 and a bottom portion 250 extending from one end of the peripheral wall portion 251 to the inner diameter side, and the clutch drum 25 has a bottomed cylindrical shape in a sectional view. .
As seen from the direction of the rotation axis X, the peripheral wall portion 251 is formed by spline crests 251a and spline valleys 251b located on the outer diameter side alternately in the circumferential direction around the rotation axis X (see FIG. 2). ), Splines are formed on the inner periphery and the outer periphery of the peripheral wall portion 251 along the rotation axis X direction.

  As shown in FIG. 1, a plurality of drive plates 31 are provided by spline fitting on the outer periphery of the peripheral wall portion 251, and each of the drive plates 31 is connected to the peripheral wall portion 251 in the circumferential direction around the rotation axis X. In a state in which the relative rotation is restricted, it is provided to be movable in the direction of the rotation axis X.

  The driven plate 32 located on the radially outer side of the peripheral wall portion 251 is also provided so as to be movable in the direction of the rotation axis X in a state where relative rotation with the transmission case 10 in the circumferential direction around the rotation axis X is restricted. Yes.

  The driven plate 32 and the drive plate 31 of the reverse brake 3 are alternately arranged in the rotation axis X direction, and the outer diameter side of the drive plate 31 and the inner diameter side of the driven plate 32 are viewed from the rotation axis X direction. They are arranged so as to overlap.

These overlapping portions of the drive plate 31 and the driven plate 32 are pressed in the direction of the rotation axis X by a piston 33 provided on the opposite side (left side in the figure) to the front cover portion 11 described above. .
The piston 33 is displaced to the front cover portion 11 side (right side in the drawing) by supplying hydraulic pressure to an oil chamber (not shown) to press the drive plate 31 and the driven plate 32.

  In the reverse brake 3, the relative rotation of the drive plate 31 and the driven plate 32 is regulated according to the fastening state by the pressing of the drive plate 31 and the driven plate 32.

  Therefore, when the drive plate 31 and the driven plate 32 are fastened together so as not to rotate relative to each other, the driven plate 32 is spline-fitted to the inner periphery of the transmission case 10, so that the drive plate 31 is spline-fitted. The clutch drum 25 is prevented from rotating around the rotation axis X.

  The forward clutch 2 located on the inner diameter side of the reverse brake 3 includes a driven plate 22 that is spline-fitted on the inner periphery of the peripheral wall portion 251 of the clutch drum 25 and a spline fit on the outer periphery of the cylindrical peripheral wall portion 241 of the clutch hub 24. The drive plate 21 and the piston 23 that strokes in the direction of the rotation axis X by hydraulic pressure.

As shown in FIG. 1, the clutch hub 24 has a cylindrical peripheral wall portion 241 and a bottom portion 240 that extends from one end of the peripheral wall portion 241 to the inner diameter side. It has a shape.
In the transmission case 10, the clutch hub 24 and the clutch drum 25 are assembled from the direction of the rotation axis X with the openings facing each other. In this state, the clutch hub 24 is a peripheral wall portion of the clutch drum 25. It is accommodated inside 251 (see FIGS. 1 and 2).

  An end portion 240a on the inner diameter side of the bottom portion 240 of the clutch hub 24 is welded to the base portion 410 of the sun gear 41, and the sun gear 41 and the clutch hub 24 are restricted from relative rotation in the circumferential direction around the rotation axis X. Are connected to each other.

As viewed from the direction of the rotation axis X, the peripheral wall portion 241 of the clutch hub 24 is formed by alternately connecting spline crests 241a and spline valleys 241b located on the outer diameter side in the circumferential direction around the rotation axis X. In addition, splines are formed along the rotation axis X direction on the inner periphery and the outer periphery of the peripheral wall portion 241 (see FIG. 2).
A plurality of drive plates 21 are spline-fitted on the outer periphery of the peripheral wall portion 241, and each drive plate 21 is restricted from rotating relative to the peripheral wall portion 241 in the circumferential direction around the rotation axis X. In the state, it is provided so as to be movable in the direction of the rotation axis X (see FIG. 2).

  As shown in FIG. 1, the driven plate 22 located on the radially outer side of the peripheral wall portion 241 also moves in the direction of the rotation axis X in a state where relative rotation with the clutch drum 25 in the circumferential direction around the rotation axis X is restricted. It is provided to be movable.

  The driven plate 22 and the drive plate 21 of the forward clutch 2 are alternately arranged in the rotation axis X direction, and the outer diameter side of the drive plate 21 and the inner diameter side of the driven plate 22 are viewed from the rotation axis X direction. They are arranged so as to overlap.

The overlapping portion of the drive plate 21 and the driven plate 22 is pressed in the direction of the rotation axis X by the piston 23 provided on the front cover portion 11 side (right side in the figure).
The piston 23 is displaced to the side away from the front cover portion 11 (left side in the drawing) by supplying hydraulic pressure to the oil chamber R formed between the bottom portion 250 of the clutch drum 25 and the drive plate 21. And the driven plate 22 are pressed.

  In the forward clutch 2, the relative rotation between the drive plate 21 and the driven plate 22 is regulated according to the engaged state by the pressing of the drive plate 21 and the driven plate 22.

  Therefore, when the drive plate 21 and the driven plate 22 are fastened so as not to rotate relative to each other, the clutch drum 25 into which the driven plate 22 is spline-fitted is connected to the carrier 44 of the planetary gear set 4, and the drive Since the clutch hub 24 to which the plate 21 is spline-fitted is connected to the sun gear 41, the sun gear 41 of the planetary gear set 4 and the carrier 44 are connected so as to be integrally rotatable.

In the peripheral wall portion 241 of the clutch hub 24, oil for guiding the lubricating oil OL supplied from the inner diameter side of the transmission case 10 to the spline peak portion 241 a located on the outer diameter side to the outer diameter side of the peripheral wall portion 241. A hole 242 is formed through the spline peak 241a in the radial direction.
In addition, in the peripheral wall part 241 of the clutch hub 24, the spline peak part 241a in which the oil hole 242 is not provided is located at a predetermined interval in the circumferential direction around the rotation axis (see FIG. 2).

  An oil hole 252 for guiding the lubricating oil OL to the outer diameter side of the peripheral wall portion 251 is also formed in the peripheral wall portion 251 of the clutch drum 25 so as to penetrate the spline peak portion 251a in the radial direction.

[Lubrication structure]
Next, the lubricating structure 1 according to the embodiment will be described.
FIG. 3 is a diagram for explaining the lubricating structure 1 according to the embodiment. FIG. 3A is a diagram of the driven plate 22 of the forward clutch 2 as viewed from the direction of the rotation axis X. FIG. FIG. 6 is a view showing the AA cross section of the driven plate 22 shown in FIG. 5 together with other components (drive plate 21 and clutch hub 24) located around the driven plate 22, and FIG. (D) is a diagram for explaining a driven plate 22A according to a conventional example that does not include a portion corresponding to the tapered portion 222 of the present application.
3A, in order to explain the positional relationship between the drive plates 21 and the driven plates 22 that are alternately arranged in the direction of the rotation axis X, the drive plates 21 that are arranged adjacent to the driven plates 22 are used. A part of is shown by a virtual line.

  As shown in FIG. 3A, the driven plate 22 of the forward clutch 2 has a base 220 that forms a ring shape when viewed from the direction of the rotation axis X. A plurality of teeth 221 that are spline-fitted to the inner periphery of the peripheral wall portion 251 (see FIG. 1) of the drum 25 are provided at predetermined intervals on the entire circumference in the circumferential direction around the rotation axis X.

  As shown in FIG. 3B, in the driven plate 22, the taper portion 222 whose thickness in the direction of the rotation axis X becomes narrower toward the inner periphery side (rotation axis X side) on the inner periphery portion of the base portion 220. , 222 are provided. In the base 220, the tapered portions 222 and 222 are provided over the entire circumference in the circumferential direction around the rotation axis X.

  As shown in FIG. 3C, the tapered portions 222 and 222 are provided on each of the one surface 220a and the other surface 220b in the rotation axis X direction of the base portion 220. The first surface 220a and the other surface 220b are inclined at a predetermined angle θ.

  The tapered portion 222 provided on one surface 220a and the tapered portion 222 provided on the other surface 220b pass through the center of the base portion 220 in the thickness direction (rotation axis X direction) and are orthogonal to the rotation axis X. They are provided symmetrically across the line segment Lm.

  The tapered portion 222 provided on one surface 220a of the base portion 220 and the inner peripheral edge 222b of the tapered portion 222 provided on the other surface 220b are located on the above-described line segment Lm, and are viewed in a cross-sectional view. The inner peripheral part of the base part 220 has a pointed shape in which the thickness in the direction of the rotation axis X decreases toward the end edge 222b.

  Here, in the forward clutch 2, when viewed from the radial direction, a plurality of drive plates 21 and driven plates 22 are alternately arranged in the direction of the rotation axis X, and each drive plate 21 and driven plate 22 has a rotation axis. Oppositely arranged in the X direction.

  As shown in FIG. 3C, in the base portion 210 of the drive plate 21, facing materials 213 and 213 (friction materials) are provided on one surface 210a and the other surface 210b in the rotation axis X direction, respectively. .

As shown in FIG. 3A, these facing materials 213 and 213 are provided in an overlapping region on the outer peripheral side of the drive plate 21 and the inner peripheral side of the driven plate 22 when viewed from the rotation axis X direction. .
Each of the facing materials 213 and 213 is formed in an arc shape along the circumferential direction around the rotation axis X, and a plurality of facing members 213 and 213 are provided at intervals in the circumferential direction around the rotation axis X.
The edge 213a on the inner diameter side of the facing material 213 is provided at a position offset from the outer edge 222a of the tapered portion 222, 222 of the driven plate 22 to the outer periphery side, and the inner diameter side of the facing material 213 The edge 213a is provided at an interval h from the outer peripheral edge 222a of the tapered portions 222, 222.
In the embodiment, the crossing angle θ between the tapered portions 222 and 222 and the one surface 220a and the other surface 220b of the base portion 220 is set so as to ensure this distance h.

The operation of the forward clutch 2 (around the drive plate 21 and the driven plate 22) employing the lubricating structure 1 having such a configuration will be described.
As shown in FIG. 3B, in the clutch hub 24 of the forward clutch 2, the drive plate 21 is spline-fitted to the outer periphery of the peripheral wall portion 241. The peripheral wall portion 241 of the clutch hub 24 has a spline peak portion. An oil hole 242 that penetrates 241 a in the radial direction of the rotation axis X is provided.
Therefore, the lubricating oil OL supplied from the rotation axis X side (inner diameter side) and reaching the inner periphery of the peripheral wall portion 241 by centrifugal force passes through the oil hole 242 and drives the drive plate 21 on the outer diameter side of the peripheral wall portion 241. And the driven plate 22 are supplied to the region Rx.

  Here, the driven plate 22 positioned on the outer diameter side of the peripheral wall portion 241 has tapered portions 222 and 222 on the inner peripheral portion of the base portion 220 (a portion facing the peripheral wall portion 241). , 222 has a pointed shape in which the width in the rotation axis X direction becomes narrower as it approaches the peripheral wall 241 (see FIG. 3C).

  Therefore, the lubricating oil OL that has passed through the oil hole 242 of the peripheral wall portion 241 and has been supplied to the inner peripheral portion side of the driven plate 22 is the end 222b on the inner diameter side of the tapered portions 222, 222 in the rotation axis X direction. The flow of the lubricating oil OL that moves along the tapered portion 222 on one side (the right side in FIG. 3C) and the lubrication that moves along the tapered portion 222 on the other side (the left side in FIG. 3C). It branches into the flow of the oil OL and is distributed to one side and the other side of the driven plate 22 in the rotation axis X direction.

  As a result, the lubricating oil OL supplied from the inner diameter side is not hindered by the driven plate 22 and between the drive plates 21, 21 adjacent on the one side and the other side in the rotational axis X direction of the driven plate 22. Therefore, the facing material 213 provided on the surface of the drive plates 21, 21 facing the driven plate 22 is lubricated with the distributed lubricating oil OL.

  Then, the lubricating oil OL guided to the region where the facing material 213 between the driven plate 22 and the drive plates 21 and 21 is located finally reaches the outer diameter side of the driven plate 22 so that the driven plate 22 is in the inner position. The oil is supplied to the reverse brake 3 located on the outer side in the radial direction from the oil hole 252 of the peripheral wall portion 251 that is spline-fitted to the periphery.

At this time, the lubricating oil OL supplied from the inner diameter side is provided with tapered portions 222 and 222 on the driven plate 22 so that the movement toward the radially outer side is not hindered. Therefore, the lubricating oil OL passes through the region where the facing material 213 is located without greatly reducing the moving speed to the radially outer side.
In this way, the lubricating oil OL passes through the region Rx in which the drive plate 21 and the driven plate 22 of the forward clutch 2 are provided radially outside without greatly reducing the moving speed outward in the radial direction. The drive plate 21 and the driven plates 22 and 22 adjacent in the direction of the rotation axis X of the drive plate 21 are appropriately cooled by the passing lubricating oil OL.

On the other hand, as shown in FIG. 3 (d), in the driven plate 22A according to the conventional example that does not include the taper portions 222, 222 of the present application, the inner peripheral surface 220d is located on the rotation axis X. It is a flat surface parallel to it. Therefore, the lubricating oil OL supplied from the inner diameter side is inhibited from moving outward in the radial direction by the inner peripheral surface 220d, so that the region where the facing material 213 between the drive plate 21 and the driven plate 22 is located is located. The moving speed at the time of passing becomes slower than the case of this application.
Therefore, the lubricating oil OL that has taken heat from the drive plate 21, the driven plate 22A, and the facing material 213 has a longer residence time in the region Rx where the drive plate 21 and the driven plate 22A are provided. The cooling efficiency of the driven plate 22A and the facing material 213 is lower than in the present application.

  Furthermore, in the case of the present application, the tapered portion 222 provided on one surface 220a of the base portion 220 of the driven plate 22 and the tapered portion 222 provided on the other surface 220b pass through the center of the base portion 220 in the rotation axis X direction. At the same time, since it is positioned symmetrically across the line segment Lm orthogonal to the rotation axis X, the lubricating oil OL supplied to the inner peripheral side of the driven plate 22 is at the edge 222b on the inner peripheral side of the driven plate 22. The lubricating oil OL flowing along the tapered portion 222 on one side of the base 220 and the lubricating oil OL flowing along the tapered portion 222 on the other side are distributed substantially evenly. Therefore, the drive plate 21 and the facing material 213 located on one side of the driven plate 22 and the drive plate 21 and the facing material 213 located on the other side are cooled substantially equally and appropriately.

As described above, in the embodiment, (1) the drive plate 21 that is spline-fitted to the outer periphery of the peripheral wall portion 241 (annular wall) of the clutch hub 24 (inner diameter side rotating body);
A driven plate 22 that is spline-fitted to the inner periphery of the peripheral wall portion 251 (annular wall) of the clutch drum 25 (outer diameter side rotating body);
A piston 23 that presses the drive plates 21 and the driven plates 22 alternately arranged in the rotation axis X direction in the rotation axis X direction;
The forward clutch (friction fastening device) configured such that the piston 23 presses the overlapping area on the outer diameter side of the drive plate 21 and the inner diameter side of the driven plate 22 in the rotation axis X direction when viewed from the rotation axis X direction. The lubricating structure in
The inner peripheral portion of the driven plate 22 is provided with tapered portions 222 and 222 in which the thickness of the base portion 220 in the rotation axis X direction becomes narrower toward the inner peripheral side.

With this configuration, since the thickness W2 of the base portion 220 of the driven plate 22 is thicker than the thickness W1 of the base portion 210 of the drive plate 21, the tapered portions 222 and 222 to the one surface 220a and the other surface 220b of the base portion 220 are formed. Can be made easier than a drive plate.
Further, in the driven plate 22, the area of the taper portions 222, 222 can be increased by the thickness of the base portion 220, and the rotating shaft can be prevented without greatly impeding the flow of the lubricating oil OL supplied from the inner diameter side. It can be distributed to one side and the other side of the driven plate 22 in the X direction.
Thus, the lubricating oil OL supplied from the inner diameter side is prevented from moving radially outward by providing the driven plate 22 with the tapered portions 222, 222. Therefore, the lubricating oil OL is prevented. Passes through the region where the facing material 213 is located between the drive plate 21 and the driven plate 22 without greatly reducing the moving speed outward in the radial direction.
Then, the lubricating oil OL passing through the region Rx in which the facing material 213 between the drive plate 21 and the driven plate 22 is located radially outside without greatly reducing the moving speed outward in the radial direction is By removing heat from the driven plate 22 and the facing material 213, the drive plate 21, the driven plate 22, and the facing material 213 are appropriately cooled.

The driven plate 22 is provided by spline fitting the outer peripheral portion of the driven plate 22 to the inner periphery of the peripheral wall portion 251 of the clutch drum 25, and the driven plate 22 is displaced in the radial direction of the rotation axis X. However, the inner peripheral portion provided with the tapered portions 222 and 222 does not interfere with the peripheral wall portion 241 of the clutch hub 24.
Therefore, if comprised as mentioned above, even if the driven plate 22 displaces to the radial direction of the rotating shaft X, the inner peripheral part in which the taper parts 222 and 222 were provided is the other side located in the inner diameter side of the driven plate 22 Since it does not interfere with the components (for example, the clutch hub 24), the inner peripheral portion provided with the tapered portions 222, 222 does not damage other components (for example, the clutch hub 24) and is driven with the drive plate 21. The plate 22 can be properly lubricated.

The driven plate 22 has a base 220 that is annular when viewed from the direction of the rotation axis X,
The tapered portions 222 and 222 are provided on one surface 220a and the other surface 220b of the base 220 in the rotation axis X direction,
The tapered portion 222 provided on one surface 220a and the tapered portion 222 provided on the other surface 220b sandwich a line segment Lm that passes through the center of the base 220 in the direction of the rotation axis X and is orthogonal to the rotation axis X. It was set as the structure located symmetrically.

  With this configuration, the lubricating oil OL supplied from the inner diameter side of the clutch hub 24 can be distributed substantially evenly to the one surface 220a and the other surface 220b in the rotation axis X direction. The drive plate 21 and the facing material 213 located on the one surface 220a side of the 22 and the drive plate 21 and the facing material 213 located on the other surface 220b side can be lubricated and cooled substantially evenly.

In the drive plate 21, facing materials 213 and 213 (friction materials) are provided in a region overlapping the inner peripheral side of the driven plate 22 when viewed from the rotation axis X direction.
When viewed from the direction of the rotation axis X, the outer peripheral edge 222a of the tapered portions 222, 222 is provided in the vicinity of the inner diameter side edge 213a of the facing materials 213, 213.

If comprised in this way, the lubricating oil OL supplied to the edge 222b of the inner peripheral side of the driven plate 22 will move along each taper part 222 and 222, and the edge of the facing materials 213 and 213 on the inner diameter side 213a is supplied to the inner peripheral side.
As a result, the lubricating oil OL distributed by the tapered portions 222 and 222 is supplied to the inner diameter side of the facing materials 213 and 213 without being supplied to the midway position in the radial direction of the facing materials 213 and 213. The lubricating oil OL thus moved moves across the facing materials 213 and 213 in the radial direction.
As a result, the distributed lubricating oil OL flows across the radial direction between the driven plate 22 and the driven plate 22 adjacent to the drive plate 21 in the rotation axis direction, and the region where the facing material 213 is located. The plate 21, the driven plate 22, and the facing material 213 can be appropriately cooled while being lubricated with the lubricating oil OL.

In the above-described embodiment, the case where the present invention is applied to the lubricating structure 1 between the drive plate 21 and the driven plate 22 of the forward clutch 2 in the forward / reverse switching mechanism 5 has been described as an example. It is not limited.
For example, the present invention may be used in a lubricating structure between the drive plate 31 and the driven plate 32 of the reverse brake 3 in the forward / reverse switching mechanism 5.
In this case, a tapered portion whose thickness in the rotation axis X direction becomes narrower toward the inner diameter side is provided on the inner peripheral portion of the driven plate 32 of the reverse brake 3.

Also with this configuration, the driven plate 32 is provided by spline fitting the outer peripheral portion of the driven plate 32 to the inner periphery of the peripheral wall portion of the transmission case 10 as in the above-described embodiment. Thus, even if the driven plate 32 is displaced in the radial direction of the rotation axis X, the inner peripheral portion provided with the tapered portion does not interfere with the peripheral wall portion 251 of the clutch drum 25.
Therefore, if comprised as mentioned above, even if the driven plate 32 displaces to the radial direction of the rotating shaft X, the inner peripheral part in which the taper part was provided is the other component (positioned on the inner diameter side of the driven plate 32 ( For example, since it does not interfere with the clutch drum 25), the drive plate 31 and the driven plate 32 are appropriately lubricated without damaging other components (for example, the clutch drum 25) by the inner peripheral portion provided with the tapered portion. it can.

1 Lubrication Structure 2 Forward Clutch 21 Drive Plate (Inner Diameter Friction Plate)
22 Driven plate (outer diameter friction plate)
222 Taper portion 23 Piston 24 Clutch hub 240 Bottom portion 241 Circumferential wall portion 241a Spline mountain portion 241b Spline valley portion 242 Oil hole 25 Clutch drum 250 Bottom portion 251 Circumferential wall portion 251a Spline mountain portion 251b Spline valley portion 252 Oil hole 3 Reverse brake 31 Plate Inner diameter friction plate)
32 Driven plate (outer diameter friction plate)
33 piston 4 planetary gear set 41 sun gear 42 pinion gear 43 ring gear 44 carrier 5 forward / reverse switching mechanism 10 transmission case 11 front cover part OL lubricating oil R oil chamber X rotating shaft

Claims (3)

A drive plate that is spline-fitted to the outer periphery of the annular wall of the inner diameter side rotor,
A driven plate that is spline-fitted to the inner circumference of the annular wall of the outer diameter side rotor,
A piston that presses the drive plate and the driven plate alternately arranged in the rotation axis direction in the rotation axis direction;
A lubrication structure in a friction fastening device in which the piston is configured to press an overlapping region on the outer diameter side of the drive plate and the inner diameter side of the driven plate in the rotation axis direction when viewed from the rotation axis direction. There,
A lubrication structure in a friction fastening device, wherein a taper portion whose thickness in the rotation axis direction becomes narrower toward an inner peripheral side is provided on an inner peripheral portion of the driven plate. The driven plate has an annular base portion as viewed from the direction of the rotation axis,
The taper portion is provided on one surface and the other surface of the base portion in the rotation axis direction,
The tapered portion provided on the one surface and the tapered portion provided on the other surface pass through the center of the base portion in the rotation axis direction and are symmetrical with respect to a center line orthogonal to the rotation axis. The lubricating structure in a friction fastening device according to claim 1, wherein In the drive plate, a friction material is provided in a region overlapping the inner diameter side of the driven plate when viewed from the rotation axis direction,
The lubricating structure in the friction fastening device according to claim 2, wherein an edge on an outer diameter side of the taper portion extends from an inner diameter side of the friction material when viewed from the rotation axis direction. .

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