JP2013124747A - Wave-shaped friction plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave-shaped wet type friction plate, having little drag torque and high durability.SOLUTION: The wave-shaped friction plate 10 includes a crest part A and a valley part B. A friction material 12a is disposed at the peak of the crest part A. When a friction engaging device is in a disengaged state, only the friction material 12a is brought into contact with an opposite plate 20. When the friction engaging device is in the disengaged state, a contact area between the friction material 12 and the opposite plate 20 can be reduced. Thus, the drag torque is reduced. Heating caused by sliding between the plate 14 of the friction plate 10 and the opposite plate 20 and generation of metal powders due abrasion are prevented, thereby maintaining durability of the friction plate 10 and product life.

Description

  The present invention relates to a wave-type friction plate used for a friction engagement device such as a wet multi-plate clutch.

A wave-shaped friction plate having a waveform in the circumferential direction (hereinafter sometimes simply referred to as “friction plate”) is engaged, for example, because the wave-shaped friction plate is elastically deformed when the clutch is engaged. When the clutch is disengaged, the friction between the friction plates is released quickly by the elastic force of the wave friction plates when the clutch is disengaged. Compared with the friction plate, there is an advantage that smooth operation can be realized. In addition, the wave type friction plate is similar to the conventional flat type friction plate, in which a friction material punched in a ring shape is affixed to the friction plate, and a segment type friction material is spaced apart from the friction plate. There is a thing stuck on.
FIG. 9 is a partially developed cross-sectional view of a friction engagement device including a conventional general wave-shaped friction plate 100 in a non-engagement state. As shown in FIG. 9, the friction plate 100 has a corrugated shape in which crests A and troughs B are alternately arranged on both sides thereof. Examples of such wave-type friction plates that have been improved include the following.

JP 2001-234946 A US published patent 2003-0150686

In Patent Document 1, as shown in FIG. 10, the friction material 112a is provided to avoid the corrugated ridge portion of the wave-shaped friction plate 100a, and the friction material 112a is prevented from cracking due to elastic deformation, thereby improving durability. An improved wave shaped friction plate is disclosed.
Further, in Patent Document 2, the friction material is not attached to the corrugated peaks and valleys of the wave-shaped friction plate, and the friction material of the friction plate is opposed when the friction engagement device is in the non-engagement state. A wave-shaped friction plate is disclosed which is not in contact with the plate.

By the way, the conventional planar friction plate has a problem of torque loss during idling, that is, reduction of drag torque, and this is no exception in the wave type friction plate. That is, when the friction engagement device is in a non-engaged state, the friction plate and the mating plate are not engaged and are idle, so that drag torque due to the viscosity of the oil is generated, and the friction material and the mating plate are always Since the friction material and the mating plate may contact each other instead of continuing to idle at a constant interval, drag torque due to sliding is also generated.
As shown in FIG. 9, the friction material 112 of the conventional general friction plate 100 is arranged at equal intervals and equal pitches, and the friction material 112 and the mating plate 120 are not engaged when the friction engagement device is disengaged. 9, since the three friction materials 112 attached to one peak A come into contact with the mating plate 120, as shown in the X part of FIG. 9, the friction material 112 and the mating plate The area in contact with 120 increases, and drag torque increases. In addition, although the thing of the aspect which affixed three friction materials on one peak part is shown in FIG. 9 for convenience of explanation, three or more friction materials are affixed on one peak part. In some cases.
Further, in the case of the friction plate 100a of Patent Document 1 as shown in FIG. 10, since the friction material at the ridge line portion of the mountain portion is eliminated as compared with the case of the friction plate 100, as shown in the X portion of FIG. Since the two friction materials 112a attached to one peak A come into contact with the mating plate 120a, the area where the friction material 112a and the mating plate 120 are in contact is small compared to the friction plate 100. The drag torque is still generated.
On the other hand, in the case of Patent Document 2, when the friction engagement device is in the non-engagement state, the friction material is pasted on the corrugated peaks and valleys of the wave-shaped friction plate so that the friction material does not contact the mating plate. However, according to this configuration, when the friction engagement device is engaged, the plate of the friction plate, which is a metal, comes into contact with the mating plate, and heat is generated due to friction, so there is a risk that the parts may be burnt. In addition, metal powder is likely to be generated due to wear of the plate, which adversely affects other parts such as bearings. Accordingly, there are problems in terms of durability of the friction plate and product life.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a wave-type wet friction plate that has less drag torque and is excellent in durability.

The present invention relates to a wave-type friction plate in which a segment-like friction material that engages with a mating plate in a friction engagement device is attached and forms a waveform in the circumferential direction.
When the friction material is provided at the top of the corrugated peak and at other positions, and the friction engagement device is in a non-engagement state, only the friction material provided at the top of the corrugated peak is the counterpart. The above-mentioned problem has been solved by a wave friction plate characterized in that it can be brought into contact with the plate.

Further, as in claim 2, in the wave-shaped friction plate in which a ring-shaped friction material that engages with the mating plate in the friction engagement device is attached and forms a waveform in the circumferential direction.
When the friction material is pressed so as to be at the top of the corrugated crest and other positions, and the friction engagement device is in a non-engagement state, only the friction material at the crest of the crest is the counterpart. It may be a wave friction plate characterized by being capable of contacting the plate.

  Further, as in claim 3, it is a preferred embodiment that an oil groove is formed in the friction material pasted on the top of the peak portion.

  According to the present invention, in the wave-shaped friction plate having a corrugated shape including a peak portion and a valley portion, when the friction engagement device is in a non-engagement state, only the friction material provided on the top of the peak portion is the counterpart plate. Since the area of the friction material that comes into contact with the mating plate is reduced when the friction engagement device is in the non-engagement state compared to the conventional friction plate, the area related to sliding is reduced. As a result, drag torque can be reduced. In the present invention, the peak and valley are convex portions when viewed from the center line of the waveform amplitude, and the concave portions are valleys. When the friction engagement device is in the non-engagement state, the friction material at the top of the peak portion comes into contact with the mating plate, so that a situation in which the metal portion of the friction plate and the mating plate do not directly contact each other does not occur. Therefore, there is no problem of excessive heating due to friction between metal parts and generation of metal powder due to wear, so the durability of the friction plate and the product life can be maintained. In addition, the smaller the surface area of the friction material provided on the top of the peak portion, the smaller the contact area between the friction material and the mating plate when the friction engagement device is in the non-engagement state.

  As described in claims 1 and 2, the present invention can be applied to any of a segmented friction material and a ring-shaped friction material. When segmented friction material is used, the material yield of the friction material can be improved and oil groove formation can be simplified. When the ring-shaped friction material is pressed, the friction engagement device is engaged. In this case, since the area of the friction material in contact with the mating plate can be ensured, heat resistance and compression resistance are improved, and durability can be enhanced. Even when a segmented friction material is used, the friction engagement device can be engaged by reducing the interval between the friction materials in the valleys or by providing a continuous friction material in the valleys. It is possible to secure a large area of the friction material in contact with the mating plate.

  Moreover, if the oil groove is formed in the friction material provided at the top of the corrugated shape as in claim 3, the area of the friction material in contact with the mating plate can be further reduced. In addition, since the oil is easily discharged to the outer peripheral portion of the friction plate by using the centrifugal force, the sliding torque due to the sliding and the viscosity of the oil can be further reduced.

The front view of the wave-shaped friction board of 1st embodiment of this invention. 1 is a partially developed cross-sectional view of a friction engagement device including a wave-shaped friction plate according to a first embodiment of the present invention in a non-engagement state. 1 is a partially developed cross-sectional view of a friction engagement device including a wave friction plate according to a first embodiment of the present invention in an engaged state. The figure which compared the drag torque on 1st conditions with the wave-shaped friction board of 1st embodiment of this invention, and a prior art example. The figure which compared the drag torque on 2nd conditions with the wave type friction board of 1st embodiment of this invention, and a prior art example. The partial front view showing the variation of the friction material of the wave type friction board of 1st embodiment of this invention. The partial front view of the wave type friction plate of 2nd embodiment of this invention and a partial expansion | deployment sectional view at the time of the non-engagement state of the friction engagement apparatus provided with the same. The partial front view of the wave type friction board of 3rd embodiment of this invention and a partial expansion | deployment state at the time of the non-engagement state of the friction engagement apparatus provided with the same. The partial expanded sectional view in the non-engagement state of the friction engagement apparatus provided with the wave-shaped friction board of the prior art example 1. FIG. The partially expanded sectional view at the time of the non-engagement state of the friction engagement apparatus provided with the wave-shaped friction board of the prior art example 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. However, the present invention is not limited to this embodiment.

  FIG. 1 is a front view of a wave-shaped friction plate 10, and the friction plate 10 alternately has ridges A and valleys B as viewed from the front. A segment-like friction material 12a is attached to the top of the peak portion A of the friction material 10, while three segment-like friction materials 12b are attached to the valley portion B. For convenience of explanation, one side has four peaks and valleys, and the friction material 12 is exaggerated. However, the configuration is not limited to that shown in FIG.

  As shown in FIG. 2, the friction material 12a is provided on the top of the peak portion A, and when the friction engagement device is in the non-engagement state, as shown in a portion X in FIG. Only is in contact with the mating plate 20. Therefore, the contact area between the friction material 12 and the mating plate 20 when the friction engagement device is in the non-engagement state can be reduced as compared with the conventional case, so that the area related to sliding can be reduced. Thus, drag torque can be reduced. Further, in the friction plate 10, since the friction material 12 is not provided in the peak portion A except for the friction material 12a, the oil passes through a relatively large gap by centrifugal force and is discharged in the outer circumferential direction of the friction plate 10. Therefore, since the amount of oil around the friction material 12a is reduced, the drag torque due to the viscosity of the oil can be further reduced. In addition, when the friction engagement device is in the non-engagement state, if only the friction material 12a is in contact with the mating plate 20, the friction material 12a may be provided on the peak portion A in addition to the friction material 12a. In that case, it is preferable because it is possible to achieve both reduction in drag torque and improvement in durability. Further, when the friction engagement device is engaged by the presence of the friction material 12a, the plate 14 of the friction plate 10 and the mating plate 20 are not in direct contact with each other. Generation of metal powder due to wear can be prevented, and durability of the friction plate 10 and product life can be maintained.

  Next, as shown in FIG. 3, when the friction engagement device is in the engaged state, the corrugated shape is crushed into a linear shape, and the friction materials 12 a and 12 b of the peak A and the valley B contact the mating plate 20. Torque is transmitted by friction. Here, when the friction engagement device is engaged, the friction material 12a of the peak portion A first comes into contact with the mating plate 20, but the friction is applied by gradually applying force in the axial direction of the friction plate 10. Since the corrugated shape of the friction material 10 is easily crushed before a large sliding force is applied to the material 12a, a problem such as peeling of the friction material 12a due to the sliding force does not occur.

  By the way, drag torque can be measured by using a device called a friction tester. Here, the friction tester is a state in which the friction engagement device is disengaged, that is, the friction plate is rotated by a motor in order to measure drag torque when the mating plate and the friction plate are idling, It is a device that can measure the drag torque applied to the mating plate with a torque meter, and can adjust the rotational speed of the motor and the flow rate of oil. FIG. 4 shows the friction plate 10 and the conventional friction plate 100 shown in FIG. 8 that are obtained in an environment where the oil flow rate is 2.0 L and the oil temperature is 40 ° C. using a friction tester. It is a graph showing sliding torque. On the other hand, FIG. 5 is a graph showing drag torque at each rotation speed obtained in an environment where the flow rate of oil is 0.5 L and the oil temperature is 40 ° C. using the same device and friction plate. As apparent from FIGS. 4 and 5, the friction material 10 according to the present invention exhibits a drag torque value lower than that of the conventional friction material 100 at almost all rotation speeds, and in particular, the rotation speed of the motor is low. It can be seen that the difference is large. Moreover, it turns out that the reduction rate of drag torque is so high that there is much flow volume of oil. Thus, it is recognized that the friction plate according to the present invention can improve the drag torque more than the conventional friction plate without being influenced by the flow rate of oil.

  As shown in FIGS. 6A to 6D, the friction engagement device is disengaged by reducing its size compared to the friction material 12a of the friction plate 10 (see FIG. 1). In this state, the sliding area between the friction material and the mating plate can be further reduced, and the drag torque due to sliding can be further reduced. Further, as shown in FIG. 6 (e), by forming the oil groove 12c in the friction material 12a by press working, it is possible to prevent contact with the mating plate 20 when the friction engagement device is in the non-engagement state. In addition to reducing the sliding area, the oil around the friction material 12a can be more easily discharged to the outer peripheral portion of the friction plate 10, and the drag torque due to the viscosity of the oil can be further reduced. Further, by reducing the width of the friction material 12b (see FIG. 1) provided in the valley B (not shown), or by forming a shape like the friction material 12b1 in FIG. Since the friction material in the engaged state can ensure a large area in contact with the mating plate, the heat resistance and compression resistance of the friction plate can be improved and the durability can be enhanced.

  Next, FIG. 7 is a partial front view (a) of a wave-shaped friction plate 50 according to the second embodiment of the present invention and a partially developed cross-sectional view of a friction engagement device including the same in a non-engagement state. (B). As shown in FIGS. 7A and 7B, the friction plate 50 has a ring-shaped friction material 52 attached to the plate 54, and the friction material 52 a of 52 d is left so as to leave the friction material 52 a on the top of the peak A. The part is pressed. In addition, as shown to (b), the friction material 52a is provided so that only the friction material 52a may contact with the other party plate 20, when a friction engagement apparatus is a non-engagement state. Therefore, the contact area between the friction material 52 and the mating plate 20 when the friction engagement device is in the non-engagement state can be reduced compared to the conventional case, and the area related to sliding can be reduced. . In addition, the shape of the friction material 52a can be made into the shape like the friction material 12a shown in FIG. 1, and the friction materials 12a1-12a4 shown in FIG. Further, according to the configuration of the friction plate 50, when the friction engagement device is in the engaged state, it is possible to secure a large area where the friction material 52 comes into contact with the mating plate 20, thereby improving heat resistance and compression resistance. And durability can be improved.

  Finally, as shown in FIGS. 8A and 8B, a ring-shaped friction material 52 is stuck on the plate 54, and the portion 52d is pressed so as to leave the friction material 52a1 on the top of the peak A. In the friction plate 50a to which the oil is applied, if the oil groove 52c is formed in the friction material 52a1 by pressing, the oil around the friction material 52a1 is removed from the outer periphery of the friction plate 50a when the friction engagement device is in the non-engagement state. Therefore, the drag torque due to the viscosity of the oil can be reduced.

  7 and 8, when the friction engagement device is in the non-engagement state, if only the friction material 52a, 52a1 at the top of the peak portion A is in contact with the counterpart plate 20, There may be a friction material 52 that is not pressed in the part A. As described above, the friction material 52 that is not press-processed is provided as much as possible in the peak portion A, so that both reduction of drag torque and improvement of durability can be achieved.

  As described above, according to the present invention, when the friction engagement device is in the non-engagement state, only the friction material provided on the top of the peak portion of the wave-shaped friction plate slides with the counterpart plate. Therefore, there is an effect that it is possible to provide a wave-type wet friction plate having less drag torque and excellent durability as compared with the prior art.

10, 50, 50a Wave type wet friction plate of the present invention 12, 52 Friction material 12c, 52c Oil groove 20 Mating plate A Mountain part B Valley part

Claims (3)

In the wave-shaped friction plate in which a segment-like friction material to be engaged with the mating plate is pasted in the friction engagement device and has a waveform in the circumferential direction,
When the friction material is provided at the top of the corrugated peak and at other positions, and the friction engagement device is in a non-engagement state, only the friction material provided at the top of the corrugated peak is the counterpart. It is possible to contact the plate,
Wave friction plate. In the wave-shaped friction plate in which a ring-shaped friction material that engages with the mating plate in the friction engagement device is attached and forms a waveform in the circumferential direction.
When the friction material is pressed so as to be at the top of the corrugated crest and other positions, and the friction engagement device is in a non-engagement state, only the friction material at the crest of the crest is the counterpart. It is possible to contact the plate,
Wave friction plate.   The wave-shaped friction plate according to claim 1 or 2, wherein an oil groove is formed in the friction material at the top of the peak portion.

Images