JP2003090369A - Wet friction plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet friction plate capable of restraining generation of dragging torque at the time of not requiring torque transmission while maintaining cooling capacity by lubricating oil. SOLUTION: An inner clutch plate 32a is constituted of a core plate 60 made of a roughly annular metal plate seen from a front surface and a plural number of friction materials 61 fastened on its surface. A plurality of the friction materials 61 are arranged with equal intervals between each other along a peripheral direction, and two rows of the friction materials 61 extending in the peripheral direction are arranged to make a concentric circle shape. A first oil groove 62 extending along a radial direction of the core plate 60 and a second oil groove 63 extending along the peripheral direction of the core plate 60 are respectively formed between each of the friction materials 61. Additionally, the first oil groove 61 and the second oil groove 63 are crossed with each other so as to make a T shape as the friction material 61 on the outer peripheral side is dislocated in the peripheral direction against the friction material 61 on the inner peripheral side of the core plate 60.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a four-wheel drive vehicle (4W
The present invention relates to a wet friction plate provided in a torque transmission device used for a driving force transmission device to a rear wheel side of a D vehicle, an automatic transmission (A / T) of various vehicles, a wet clutch of an industrial machine, and the like.

[0002]

2. Description of the Related Art Conventionally, among the above torque transmitting devices, for example, a driving force transmitting device is an inner shaft which is two rotating members which are coaxially and relatively rotatable with each other.
It is equipped with an outer case. A plurality of clutch plates as wet friction plates are arranged between the inner shaft and the outer case, and the outer case and the inner shaft are coupled so that torque can be transmitted by frictionally engaging the clutch plates. It has become so. Lubricating oil is contained between the outer case and the inner shaft.

The clutch plate is formed by adhering a plurality of friction materials made of paper material on the surface of a core plate made of a substantially annular metal plate. These friction materials are formed in a rectangular shape that extends in the radial direction of the core plate, and each long side has a length that reaches from the inner peripheral edge to the outer peripheral edge of the core plate, and forms a radial shape on the surface of the core plate. It is arranged as follows. When the clutch plates are engaged with each other, the friction plates prevent the core plates from directly slidingly contacting each other and prevent iron wear particles from coming out.

An oil groove is formed between each pair of adjacent friction materials so as to extend linearly in the radial direction from the inner peripheral edge to the outer peripheral edge of the core plate. When the clutch plate rotates, the lubricating oil flows in the oil groove from the inner peripheral edge to the outer peripheral edge of the core plate due to centrifugal force during rotation. Then, the clutch plate is cooled by the lubricating oil flowing through the oil groove.

[0005]

However, according to the above-mentioned conventional clutch plate, in order to perform torque transmission with high efficiency, the width of the oil groove is made narrow so that the area where the clutch plates contact each other is as small as possible. Need to be bigger. However, in this case, since the lubricating oil has viscosity, the clutch plates are not sufficiently separated from each other, and one of the two clutch plates is disengaged from the frictional engagement and the other is dragged through the lubricating oil. Torque may be generated. Then, when the drag torque is generated, there is a problem that the torque may be transmitted even when the torque transmission is not required.

On the other hand, in order to solve the above problems,
It is also known that one end of some oil grooves does not reach the outer peripheral edge of the core plate, and the flow of lubricating oil from the inner peripheral edge of the core plate toward the outer peripheral edge is stopped midway. . When configured in this way, the lubricating oil whose flow has been stopped in the middle tries to spread laterally from there, so that the clutch plates are sufficiently separated from each other,
Generation of drag torque can be suppressed. However, in the case of such a configuration, there is a problem that the cooling capacity of the clutch plate is reduced because the lubricating oil remains in the oil groove.

The present invention has been made by paying attention to the problems existing in the prior art. It is an object of the present invention to provide a wet friction plate that can suppress the generation of drag torque when torque transmission is not required while maintaining the cooling capacity of lubricating oil.

[0008]

In order to achieve the above object, the invention of a wet friction plate according to a first aspect of the present invention is arranged in a lubricating oil of a torque transmission device, and friction between two rotating members is provided. A wet friction plate that is in a connected state in which it is engaged to transmit torque and in a non-connected state in which it is separated to cut off torque transmission, and a plurality of friction members are provided on the surface of a core plate made of a substantially annular metal plate. Are fixed at intervals, the first oil groove extending from the inner peripheral edge to the outer peripheral edge of the core plate between the adjacent friction materials, and the second oil groove extending in a direction intersecting with the first oil groove. And a groove for forming the first oil groove and the second oil groove.
The oil groove is configured to allow the lubricating oil to flow, and the first oil groove and the second oil groove are intersected with each other so as to form a substantially T shape on at least a part of the surface of the core plate. It is characterized in that the flowing lubricating oil hits the friction material and flows into the second oil groove.

The invention of a wet friction plate according to a second aspect is the invention according to the first aspect, wherein the first oil groove and the second oil groove formed by the friction material are such that the inflowing lubricating oil is the core plate. It is configured to be discharged to the outside of the core plate from the inner circumference through the first oil groove and the second oil groove.

The invention of a wet friction plate according to a third aspect is the invention of the first or second aspect, wherein the friction material is formed in a substantially rectangular shape and the core is sandwiched by the second oil groove. It is characterized in that the first oil groove provided on the outer peripheral side is displaced from the first oil groove provided on the inner peripheral side of the plate in the circumferential direction of the core plate.

The invention of the wet friction plate according to claim 4 is the invention according to any one of claims 1 to 3,
A plurality of the friction materials are arranged at substantially equal intervals along the circumferential direction of the core plate, and at least two rows of the friction materials extending in the circumferential direction of the core plate are concentrically arranged. It is characterized by being provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 3, a driving force transmission device 11 as a torque transmission device, which is an embodiment of the present invention, is arranged in a driving force transmission path to a rear wheel side of a four-wheel drive vehicle 12. There is. That is,
The four-wheel drive vehicle 12 includes a drive force transmission device 11, a transaxle 13, an engine 14, and a pair of front wheels 15 and rear wheels 1.
6 is provided. The driving force transmission device 11 is supported by the vehicle body via the differential carrier 22 while being housed in the differential carrier 22.

The engine 14 drives the front wheels 15 by outputting its driving force to the front axle shaft 17 via the transaxle 13. From the rear wheel 16 side to the transaxle 13, the propeller shaft 1
A driving force transmission device 11 is connected via 8. The drive force transmission device 11 includes a drive pinion shaft 19
The rear differential 20 is connected via.
A rear wheel 16 is connected to the rear differential 20 via a rear axle shaft 21. Then, when the propeller shaft 18 and the drive pinion shaft 19 are coupled by the driving force transmission device 11 so that torque can be transmitted, the driving force of the engine 14 is transmitted to the rear wheels 16.

Next, the driving force transmission device 11 will be described. As shown in FIG. 2, the driving force transmission device 11 includes an outer case 30a and an inner shaft 30b as two rotating members. The outer case 30a has a tubular front housing 31a that extends in the lateral direction and has a front end side opening on the left side in FIG. 2 closed, and a rear screwed to the rear end side opening of the front housing 31a. It is composed of a housing 31b. An input shaft 50 is projectingly provided on the front end of the front housing 31a.

The inner shaft 30b passes through the central portion of the rear housing 31b and passes through the front housing 31.
It is inserted in a. Inner shaft 30 in this state
The movement of b is restricted in the axial direction, and is supported so as to be rotatable relative to the front housing 31a and the rear housing 31b.

On the front end side inside the front housing 31a, a multi-plate clutch mechanism 30c having a large number of inner clutch plates 32a as wet friction plates and an outer clutch plate 32b is arranged. Each inner clutch plate 32a has an inner shaft 30b.
Is fitted to the outer periphery of the inner shaft 30b by a spline so as to be movable in the axial direction of the inner shaft 30b. Each outer clutch plate 32b is spline-fitted to the inner circumference of the front housing 31a, and is assembled so as to be movable in the axial direction of the front housing 31a. Inner clutch plate 32a and outer clutch plate 32b
Are arranged alternately and are in a frictional engagement state when they are in contact with each other, and in a non-engaged free state when they are separated from each other.

A first member is provided on the front surface of the rear housing 31b.
A cam member 37 is rotatably supported. Further, the first cam member 37 is rotatably mounted on the outer circumference of the inner shaft 30b. A second cam member 38 is arranged on the front end side of the first cam member 37 so as to face the inner clutch plate 32a. The second cam member 38 is spline-fitted on the outer periphery of the inner shaft 30b so as to be movable in the axial direction thereof, and is rotatable integrally with the inner shaft 30b.

The second cam member 38 and the first cam member 3
A ball-shaped cam follower 39 is interposed between the cam follower 39 and the camera 7. The cam follower 39 is housed in a cam groove (not shown) which is provided in a recess in the facing surface of each of the second cam member 38 and the first cam member 37. Then, when relative rotation occurs between the first cam member 37 and the second cam member 38, the cam followers 39 shift the second cam member 38 to the clutch mechanism 30 due to the displacement of the respective cam grooves.
It is configured to press to the c side.

At the front end of the rear housing 31b, a multi-plate friction clutch 34 consisting of one inner clutch plate 34a and two iron outer clutch plates 34b is arranged. Inner clutch plate 34a
Is spline-fitted to the outer periphery of the first cam member 37 so as to be movable in the axial direction. The outer clutch plate 34b is arranged so as to sandwich the inner clutch plate 34a from the front-rear direction, and is spline-fitted to the inner periphery of the front housing 31a so as to be movable in the axial direction. The outer clutch plate 34b and the inner clutch plate 34a are in a frictional engagement state when they abut each other, and are in a disengaged free state when they are separated from each other.

On the front end side of the friction clutch 34,
An annular armature 35 is spline-fitted to the inner circumference of the front housing 31a so as to be movable in the axial direction of the front housing 31a. Also, this armature 3
5 is assembled so as to face the friction clutch 34.
A yoke 3 is provided on the outer periphery of the rear end of the rear housing 31b.
6 is supported so as to be rotatable relative to the rear housing 31b. The yoke 36 has an annular electromagnet 33.
Is fitted.

As shown in FIGS. 2 and 3, the driving force transmission device 11 is mounted on the differential carrier 22 of the four-wheel drive vehicle 12 by rotatably supporting the outer case 30a and supporting the yoke 36. Has been. With the driving force transmission device 11 attached to the differential carrier 22, the front housing 31
The input shaft 50 of a is connected to the propeller shaft 18, and the inner shaft 30b is connected to the drive pinion shaft 19.

The driving force transmission device 11 includes an outer case 30a, an inner shaft 30b and a rear housing 31.
A wet drive force transmission device 11 is configured by filling a chamber surrounded by b with lubricating oil. The lubricating oil lubricates the outer case 30a, the inner shaft 30b, the rear housing 31b, and the like. Further, the clutch mechanism 30c and the friction clutch 3
The inner clutch plates 32a and 34a and the outer clutch plates 32b and 34b of No. 4 are arranged in the lubricating oil and are cooled by the lubricating oil.

Here, the inner clutch plate 32a and the outer clutch plate 3 of the clutch mechanism 30c.
2b as a specific example, the structure of the wet friction plate will be described. 1A shows a front view of the inner clutch plate 32a, and FIG. 1B shows the inner clutch plate 32a.
The front view which expanded a part of surface of FIG. Also,
FIG. 1C is a side sectional view showing a state where the inner clutch plate 32a and the outer clutch plate 32b are frictionally engaged.

The inner clutch plate 32a is a core plate 60 made of a metal plate having a substantially annular shape when viewed from the front.
And a plurality of friction materials 61 made of strips of paper-based material fixed to the surface of the core plate 60. Further, the outer clutch plate 32b also has a core plate 60, like the inner clutch plate 32a.
A plurality of friction materials 61 made of strips of paper-based material are fixed to the surface of the core plate 60. The inner clutch plate 32a and the outer clutch plate 32b are arranged so that the surfaces to which the friction material 61 is fixed are in sliding contact with each other. The friction members 61 prevent the core plates 60 from directly slidingly contacting each other and prevent metal wear particles from coming out.

The friction material 61 has a rectangular shape extending in the circumferential direction of the core plate 60 when viewed from the front, and has the same thickness, for example, 0.4 mm. A plurality of the friction members 61 are arranged at equal intervals along the circumferential direction of the core plate 60, and the rows of the friction members 61 extending in the circumferential direction of the core plate 60 are concentric. Two rows are provided. Further, the friction members 61 of the row provided on the outer peripheral side are displaced from the friction materials 61 of the row provided on the inner peripheral side of the core plate 60 by half in the circumferential direction of the core plate 60. The plurality of friction materials 61 are arranged in a staggered pattern.

On the surface of the core plate 60, between the friction members 61 adjacent to each other in the circumferential direction, the first oil radially extending from the inner peripheral edge to the outer peripheral edge along the radial direction of the core plate 60. Each groove 62 is formed. Between each friction material 61 provided on the outer peripheral side of the core plate 60 and each friction material 61 provided on the inner peripheral side,
Second oil grooves 63 extending along the circumferential direction of the core plate 60 are formed so as to intersect the first oil grooves 62, respectively. Since the plurality of friction materials 61 are arranged in a substantially zigzag manner, the first oil groove 62 and the second oil groove 63 intersect each other in a T shape on the entire surface of the core plate 60. ing. In this state, the inner first oil groove 62a provided on the inner peripheral side of the core plate 60 with the second oil groove 63 interposed therebetween.
And the outer first oil groove 62b provided on the outer peripheral side are displaced from each other. Also, these inner first oil grooves 62a,
The second oil groove 63 and the outer first oil groove 62b are continuously formed from the inner peripheral edge to the outer peripheral edge of the core plate 60 without interruption.

When the inner clutch plate 32a and the outer clutch plate 32b are in sliding contact with each other, the lubricating oil interposed therebetween flows into the first oil groove 62 and the second oil groove 63. Then, when the inner clutch plate 32a rotates, the lubricating oil is rotated by the centrifugal force of the inner first oil groove 62a, the second oil groove 63, and the outer first oil groove 62b in the order shown by the arrow in FIG. 1 (b). It comes to flow. At this time, the lubricating oil removes heat from the inner clutch plate 32a and is discharged to the outside as it is, thereby cooling the inner clutch plate 32a. Further, the inner first oil groove 62a is arranged substantially at the center in the longitudinal direction with respect to the friction material 61 provided on the outer peripheral side of the core plate 60. Therefore, the lubricating oil flowing out from the inner first oil groove 62a is divided into two, and the second oil groove 6
3 to reach the outer first oil groove 62b,
The clockwise direction and the counterclockwise direction are the same in the circumferential direction of the core plate 60.

The operation of the above embodiment will be described below. Now, in the driving force transmission device 11 shown in FIG. 2, when the electromagnet 33 is not energized, the friction clutch 3
4 is in a non-engaged state. Therefore, the first cam member 37
Is rotatable integrally with the second cam member 38 via the cam follower 39, and the clutch mechanism 30c is in the non-operating state. Then, the four-wheel drive vehicle 12 enters the two-wheel drive mode.

On the other hand, when the electromagnet 33 is energized, the armature 35 is attracted to the electromagnet 33 and the friction clutch 3
4 is pressed and frictionally engaged. In this state, the first cam member 37 is connected to the front housing 31a side, and relative rotation occurs between the first cam member 37 and the second cam member 38, so that the second cam member 38 is rotated.
Is pressed by the cam follower 39 in a direction away from the first cam member 37. As a result, the second cam member 38 pushes the clutch mechanism 30c forward. Then, the inner clutch plate 32a and the outer clutch plate 32b that form the clutch mechanism 30c are frictionally engaged with each other, and torque is transmitted between the outer case 30a and the inner shaft 30b. Then, the four-wheel drive vehicle 12 enters a four-wheel drive drive mode in which the propeller shaft 18 and the drive pinion shaft 19 are directly connected.

In the four-wheel drive mode, the lubricating oil flows through the first oil groove 62 and the second oil groove 63 formed on the surface of the inner clutch plate 32a. At this time,
The lubricating oil first enters the inner first oil groove 62a from the inner peripheral edge of the core plate 60, as indicated by the arrow in FIG. As it is, the lubricating oil flows through the inner first oil groove 62a while removing heat from the surroundings, and eventually collides with the side surface of the friction material 61 provided on the outer peripheral side of the core plate 60. Then,
The lubricating oil is divided into two and spreads in the second oil groove 63 in the lateral direction while reducing the flow velocity thereof.

Then, the lubricating oil that has spread inside the second oil groove 63 eventually reaches the outer first oil groove 62b formed between the friction members 61 provided on the outer peripheral side, and from there, the inner clutch plate 32a. Is discharged to the outside. Therefore, the lubricating oil is discharged from the surface of the inner clutch plate 32a almost immediately while cooling the inner clutch plate 32a. Then, the discharged lubricating oil is cooled while lubricating them in the outer case 30a or the like, and then enters the first oil groove 62 from the inner peripheral edge of the core plate 60 again to cool the same.

When changing from the four-wheel drive drive mode to the two-wheel drive drive mode, in reverse to the above, first the second
The pressing of the clutch mechanism 30c by the cam member 38 is released. Then, the inner clutch plate 32a and the outer clutch plate 32b are disengaged from each other in an attempt to separate from each other. At this time, as shown by the arrow in FIG. 1C, the lubricating oil collides with the side surface of the friction material 61 and is blocked from flowing in the centrifugal direction, that is, the radial direction,
The inner clutch plate 32a and the outer clutch plate 32b are pushed laterally in the second oil groove 63 so as to be separated from each other. Therefore, the frictional engagement between the inner clutch plate 32a and the outer clutch plate 32b is quickly released, and the drag torque is prevented from being generated.

Therefore, according to this embodiment, the following effects can be obtained. (1) In the present embodiment, the inner clutch plate 34a
By fixing a plurality of friction materials 61 to the surface of the core plate 60, a first oil groove 62 extending in the radial direction and a second oil groove 63 extending in the circumferential direction are continuously formed on the surface. There is. The first oil groove 62 and the second oil groove 63 intersect each other in a T shape on the entire surface of the core plate 60. For this reason, the lubricating oil flowing through the first oil groove 62 and the second oil groove 63 is discharged to the outside of the inner clutch plate 34a almost immediately without removing the heat while taking heat, and therefore the lubricating oil is used. The cooling capacity can be maintained.

(2) Further, due to the centrifugal force of the core plate 60, the lubricating oil easily flows into the first oil groove 62 and the second oil groove 63, and the lubricating oil reaching the second oil groove 63 is laterally moved. Since the inner clutch plate 32a and the outer clutch plate 32b can be pressed in the directions in which the inner clutch plate 32a and the outer clutch plate 32b are separated from each other, the generation of drag torque when torque transmission is not required can be suppressed.
In addition, the first oil groove 6 that intersects in a T shape by a simple operation such as fixing the friction material 61 to the surface of the core plate 60.
The second and second oil grooves 63 can be easily formed, the manufacturing cost can be reduced, and the amount of waste generated can be reduced as compared with the case where press processing, cutting processing or the like is performed. Can be planned.

(3) In this embodiment, since the friction material 61 is formed in a rectangular shape, the first oil groove 62 and the second oil groove 63 formed between the friction materials 61 are enlarged in the middle. It can be formed in a substantially linear shape with almost no obstacles without bending or the like. Therefore, the first oil groove 62
Also, the lubricating oil can flow in the second oil groove 63 with almost no resistance, and the cooling capacity can be maintained well.

(4) Further, the inner first oil groove 62a and the outer first oil groove 62b provided on the inner peripheral side and the outer peripheral side of the core plate 60 with the second oil groove 63 interposed therebetween are the core plate 60. Are displaced from each other in the circumferential direction. Therefore, it is possible to prevent the lubricating oil from being discharged to the outside of the core plate 60 excessively quickly, and to surely spread the lubricating oil flowing in the first oil groove 62 and the second oil groove 63 in the lateral direction. Therefore, it is possible to effectively prevent the generation of drag torque.

(5) The friction material 61 is the core plate 6
A plurality of sheets are arranged at equal intervals along the circumferential direction of 0, and two rows of the friction material 61 extending in the circumferential direction of the core plate 60 are provided so as to form concentric circles. . Therefore, the bend angle between the first oil groove 62 and the second oil groove 63 can be reduced, the decrease in the flow velocity when the lubricating oil makes a turn at such a bend angle can be suppressed, and the cooling capacity can be more effectively achieved. Can be maintained. Of course, three or more rows of concentric friction members 61 may be provided.

(6) Since the first oil groove 62 is formed to extend in the radial direction of the core plate 60 and the second oil groove 63 is formed to extend in the circumferential direction, centrifugal force is effectively exerted on the lubricating oil. Therefore, the lubricating oil can efficiently and smoothly flow in the first oil groove 62 and the second oil groove 63.

(7) Further, by arranging the friction materials 61 in a zigzag manner, the first oil groove 62 and the second oil groove 63 can be easily crossed in a T shape on the entire surface of the core plate 60. it can. Further, by arranging in a staggered manner, the inner first oil groove 62a is arranged in the center between the pair of outer first oil grooves 62b adjacent to each other.
The lubricating oil can be efficiently and smoothly made to flow at a substantially constant flow velocity over the entire surface. (Other Embodiments) The present embodiment can be modified and embodied as follows.

In the above-described embodiment, by disposing the friction materials 61 in a zigzag manner, the first oil groove 62 and the second oil groove 63 intersect each other in a T shape on the entire surface of the core plate 60. I am letting you. However, the present invention is not limited to this, and as shown in FIG. 4, for each friction material 61 of the row provided on the inner peripheral side of the core plate 60, each friction material 61 of the row provided on the outer peripheral side is provided. The position may be gradually displaced in the circumferential direction of. And, in part, the inner first oil groove 62a
The outer first oil groove 62b may be arranged in a substantially straight line. With such a configuration, the lubricating oil can be discharged more quickly at the portion where the inner first oil groove 62a and the outer first oil groove 62b are arranged in a substantially straight line, so that the cooling capacity can be enhanced. Therefore, by increasing or decreasing the number of locations where the inner first oil groove 62a and the outer first oil groove 62b are arranged in a substantially straight line, the cooling performance is emphasized or the drag torque is prevented. You can adjust whether or not. Alternatively, each first oil groove 6
By changing the width of 2 respectively, the core plate 60
The inner first oil groove 62a and the outer first oil groove 62b may be displaced from each other on the entire surface or a part thereof.

As shown in FIG. 5, the core plate 6
The friction material 61 arranged on the inner peripheral side of 0 is set to about half the size of the friction material arranged on the outer peripheral side, and the two friction materials 61 on the inner peripheral side and the one friction material 61 on the outer peripheral side are used. You may form the 1st oil groove 62 and the 2nd oil groove 63 which intersect in a T shape between them. When configured in this way, the number of outer first oil grooves 62b provided on the outer peripheral side is smaller than the number of inner first oil grooves 62a provided on the inner peripheral side, and more lubricating oil is generated in the centrifugal direction. In other words, the flow in the radial direction is blocked,
The amount can be expanded laterally in the second oil groove 63. Therefore, the pressing force acting in the direction of separating the inner clutch plate 32a and the outer clutch plate 32b from each other can be increased, and the drag torque can be more effectively prevented.

Further, assuming that the inner clutch plate 32a rotates clockwise, as shown in FIG. 6, each friction material 61 is formed into a substantially parallelogram shape, and the inner first oil groove 62a is formed.
The first oil grooves 62 of both the outer first oil groove 62b and the outer first oil groove 62b may be provided in an oblique shape that extends in the clockwise direction toward the outer periphery of the core plate 60. With such a configuration, the lubricating oil is less likely to flow in the inner first oil groove 62a and the outer first oil groove 62b, and tends to spread laterally also in the first oil groove 62. Therefore, the pressing force acting in the direction of separating the inner clutch plate 32a and the outer clutch plate 32b from each other can be increased, and the drag torque can be more effectively prevented.

In addition, as shown in FIG. 7, each friction material 61
In a substantially parallelogram shape, the inner first oil groove 62a extends obliquely in the counterclockwise direction toward the outer periphery of the core plate 60, and the outer first oil groove 62b extends obliquely in the clockwise direction toward the outer periphery of the core plate 60. You may provide in a shape. With this configuration, the lubricating oil easily flows in the inner first oil groove 62a, and the cooling capacity can be enhanced. Further, the lubricating oil is less likely to flow in the outer first oil groove 62b and is easily spread laterally in the second oil groove 63, so that the pushing force acting in the direction in which the inner clutch plate 32a and the outer clutch plate 32b are separated from each other. It is possible to increase the pressure and more effectively prevent the drag torque from being generated.

In addition to the configuration shown in FIG.
The inner first oil groove 6 is partially combined with the configuration shown in FIG.
2a and the outer first oil groove 62b are arranged in a substantially straight line, and by making it difficult for the lubricating oil to flow in the inner first oil groove 62a and the outer first oil groove 62b, the cooling capacity is improved and the drag torque is reduced. It may be configured to obtain a synergistic effect by combining the respective configurations such as prevention of occurrence. In addition to this, a synergistic effect can be obtained by combining the configuration shown in FIG. 5 with the configurations shown in FIGS. 6 and 7, or by combining the configuration shown in FIG. 4 with the configuration shown in FIG. May be configured to obtain

In the above-described embodiment, the clutch plate of the driving force transmission device 11 used for transmitting torque to the rear wheels of the four-wheel drive vehicle 12 is used, but the present invention is not limited to this, and for example in an automatic transmission of various vehicles. It may be used for the clutch plate of the torque transmission device used. Alternatively, it may be used for a clutch plate of a torque transmission device such as a wet brake used in an industrial machine or the like.

In the above embodiment, the clutch mechanism 30
Although the first oil groove 62 and the second oil groove 63 that intersect each other in a T shape are provided on the inner clutch plate 32a and the outer clutch plate 32b of c, the friction clutch 34
The inner clutch plate 34a and the outer clutch plate 34b may be configured as described above.

The friction material 61 is not limited to a rectangular shape, but is, for example, a square shape, a vertically long quadrangular shape, a parallelogram shape, a quadrilateral shape such as a rhombus shape, a triangular shape, a pentagonal shape, a hexagonal shape, a circular shape, an ellipse shape, and the like. It may have a shape, a fan shape, an arc shape, or the like.

The rows of the friction material 61 extending in the circumferential direction of the core plate 60 may be provided in three or more rows so as to form a concentric circle shape. -In the said embodiment, the 1st oil groove 62 is made into the core plate 6
Although it is formed in a substantially straight line shape extending in the radial direction of 0, the present invention is not limited to this, and may be formed in, for example, an oblique line shape, an arc shape, or the like, which is separated from the radial direction toward the outer periphery. In addition, the second oil groove 63
Does not have to be formed in a substantially annular shape extending in the circumferential direction of the core plate 60, but may be formed in an oblique line shape, an arc shape, or the like that is closer to the outer peripheral edge or the inner peripheral edge in the circumferential direction.

Next, technical ideas that can be understood from the above-described embodiment and other embodiments will be described below together with their effects. (A) The wet friction plate according to any one of claims 1 to 4, wherein the friction materials are arranged in a staggered pattern.
With this configuration, the first oil groove and the second oil groove can intersect in a T shape on the entire surface of the core plate.

(B) The first oil groove and the second oil groove are formed so as to extend in the radial direction and the circumferential direction of the core plate, respectively. Wet friction plate. When configured in this way, the first
The lubricating oil can efficiently and smoothly flow in the oil groove and the second oil groove.

(C) The first oil groove provided on the inner peripheral side of the core plate is arranged in the center between a pair of first oil grooves provided on the outer peripheral side. The wet friction plate according to claim 3 or 4. With this structure, the lubricating oil can be efficiently and smoothly flowed over the entire surface of the core plate.

[0052]

As described in detail above, the present invention has the following effects. According to the invention described in claim 1, it is possible to suppress the generation of the drag torque when torque transmission is not required, while maintaining the cooling capacity by the lubricating oil.

According to the invention of claim 2, claim 1
In addition to the effects of the invention described in 1,
It is possible to facilitate the flow into the first and second oil grooves. According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the cooling capacity can be favorably maintained, and the generation of drag torque is effectively suppressed. be able to.

According to the invention of claim 4, claim 1
From the effect of the invention according to claim 3,
The cooling capacity can be more effectively maintained while suppressing the generation of drag torque.

[Brief description of drawings]

1A is a front view showing an inner clutch plate of an embodiment, FIG. 1B is a partially enlarged front view showing a state in which a part of the inner clutch plate is enlarged, and FIG. 1C is an inner clutch plate and an outer clutch. FIG. 4 is a partially enlarged side sectional view showing a state where the plates are frictionally engaged.

FIG. 2 is a sectional view of a main part of the driving force transmission device according to the present embodiment.

FIG. 3 is an explanatory diagram of a four-wheel drive vehicle equipped with a driving force transmission device.

FIG. 4 is a partially enlarged front view showing a part of an inner clutch plate of another form.

FIG. 5 is a partially enlarged front view showing a part of an inner clutch plate of another form.

FIG. 6 is a partially enlarged front view showing a part of an inner clutch plate of another form.

FIG. 7 is a partially enlarged front view showing a part of an inner clutch plate of another form.

[Explanation of symbols]

30a ... Outer case as rotating member, 30b ... Inner shaft as rotating member, 32a ... Inner clutch plate as wet friction plate, 32b ... Outer clutch plate as wet friction plate, 60 ... Core plate, 6
1 ... Friction material, 62 ... 1st oil groove, 63 ... 2nd oil groove.

Claims (4)

[Claims] 1. Arranged in the lubricating oil of the torque transmitting device,
A wet friction plate that is in a coupled state in which two rotary members are frictionally engaged to transmit torque and in a non-coupled state in which they are separated from each other to interrupt torque transmission, and is a core plate made of a substantially annular metal plate. A plurality of friction materials are fixed to the surface of the core at intervals, and a first oil groove extending from the inner peripheral edge to the outer peripheral edge of the core plate is provided between the adjacent friction materials, and the first oil groove. A second oil groove extending in the intersecting direction is formed, and the lubricating oil flows through the first oil groove and the second oil groove, and the first oil groove and the second oil groove are formed in the core plate. A wet type friction plate, characterized in that at least a part of the surface is crossed so as to form a substantially T-shape, and the lubricating oil flowing through the first oil groove hits the friction material and flows into the second oil groove. 2. The first oil groove and the second oil groove formed of the friction material are such that the inflowing lubricating oil passes from the inner periphery of the core plate to the first oil groove and the second oil groove of the core plate. The wet friction plate according to claim 1, wherein the wet friction plate is configured to be discharged outward. 3. The friction material is formed in a substantially rectangular shape, and a first oil groove provided on the outer peripheral side with respect to a first oil groove provided on the inner peripheral side of the core plate with the second oil groove interposed therebetween. The wet friction plate according to claim 1 or 2, wherein the oil groove is displaced in the circumferential direction of the core plate. 4. A plurality of the friction materials are arranged at substantially equal intervals along the circumferential direction of the core plate,
The wet friction plate according to any one of claims 1 to 3, wherein at least two rows of friction materials extending in the circumferential direction of the core plate are provided so as to form a concentric circle shape.