JP3149595U - Wet friction plate - Google Patents

Abstract

A wet friction plate capable of reducing drag torque is provided. A friction plate 1 includes a core plate 11 in which iron or the like is formed in a ring shape, and a gear 13 that engages with a shaft is formed on the inner periphery of the core plate 11. On the surface of the core plate 11, a plurality of friction portions 15 are provided in a dot shape at predetermined intervals, and oil grooves 17 are formed between the friction portions 15. A plurality of convex portions and concave portions having a height lower than the depth of the oil groove 17 are provided on the surface of the friction portion 15, and the convex portions and the concave portions are arranged so as to form a groove portion on the surface of the friction portion 15. Yes. [Selection] Figure 2

Description

  The present invention relates to a wet friction plate.

  For automatic transmission transmissions, torque converters, and starting clutches, multi-plate clutches using wet friction materials, specifically, by applying pressure to the opposing surface with the friction plates immersed in oil. In some cases, a wet friction engagement device is used.

  The wet friction engagement device includes, for example, a friction plate (wet friction plate) in which a friction material using a paper material or a nonwoven fabric is attached to the surface of a core plate such as iron, and a separator plate made of a plate material such as iron. It has a structure of alternately overlapping.

  On the other hand, in a wet friction engagement device using such a friction plate, the friction plate and the separator plate are idling when not engaged.

  Therefore, drag torque (drag torque) due to oil remaining without being discharged from the friction material is generated, which causes a deterioration in fuel consumption.

  Therefore, there is a demand for a wet friction plate having a structure in which drag torque is reduced as much as possible.

  The structure of the wet friction plate that reduces drag torque is a structure in which friction material is attached to the core plate in the form of dots to form oil discharge grooves between the dots, and the oil discharge grooves are also provided on the friction material. Yes (Patent Document 1).

JP 2007-263203 A

  However, the structure as disclosed in Patent Document 1 has a problem that the oil discharge of the wet friction material is insufficient in order to achieve further improvement in fuel consumption.

  This invention is made | formed in view of this point, and the technical subject is to provide the wet friction board which can reduce drag torque conventionally.

  In order to solve the above-described problem, the first device has a core plate and a friction portion arranged in a dot shape on the core plate, and the friction portion has a plurality of convex portions on the surface. A wet friction plate, wherein the plurality of convex portions and the plurality of concave portions are arranged so as to form a groove portion on a surface of the friction portion.

  In the present invention, it is possible to provide a wet friction plate capable of reducing the drag torque as compared with the prior art.

1 is a cross-sectional view showing a structure of a clutch pack 100 using a friction plate 1. FIG. 3 is a plan view showing the friction plate 1. FIG. 3 is an enlarged view of the vicinity of a friction portion 15 in FIG. 2. FIG. 4 is an enlarged view of a region 200 of a friction part 15. It is a figure which shows the test result of drag torque.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the structure of the clutch pack 100 using the friction plate 1 (wet friction plate) according to the present invention will be described with reference to FIG.

  Here, as the clutch pack 100, a clutch pack used in an automatic transmission for an automobile is illustrated.

  As shown in FIG. 1, the clutch pack 100 has a cylindrical drum 3 filled with oil.

  On the inner periphery of the drum 3, a key groove 3 a that engages with a separator plate 5 described later is formed in the longitudinal direction (rotational axis direction A).

  In the drum 3, ring-shaped friction plates 1 and separator plates 5 are provided alternately.

  A shaft 7 is provided inside the friction plate 1 and the separator plate 5.

  A key groove 7 a that engages with the friction plate 1 is formed on the outer periphery of the shaft 7 in the longitudinal direction (rotational axis direction A).

  Here, the outer periphery of the separator plate 5 is engaged with the key groove 3a, and the movement of the separator plate 5 is restricted by the key groove 3a.

  That is, the moving direction of the separator plate 5 is limited to the direction of the key groove 3a, that is, the rotation axis direction of the clutch pack 100 (A direction in FIG. 1).

  On the other hand, the inner periphery of the friction plate 1 is engaged with the key groove 7a of the shaft 7, and the movement of the friction plate 1 is restricted by the key groove 7a.

  That is, the moving direction of the friction plate 1 is limited to the direction of the key groove 7a, that is, the rotation axis direction of the clutch pack 100 (A direction in FIG. 1).

  Therefore, by moving the shaft 7 in the direction A in FIG. 1, the surfaces of the friction plate 1 and the separator plate 5 are engaged and separated, and power is transmitted and cut off between the drum 3 and the shaft 7.

  Next, the structure of the friction plate 1 will be described in detail with reference to FIGS.

  As shown in FIGS. 2 and 3, the friction plate 1 has a core plate 11 in which iron or the like is formed in a ring-shaped plate material, and a gear that engages with the key groove 7 a of the shaft 7 on the inner periphery of the core plate 11. 13 is formed.

  On the surface of the core plate 11, a plurality of friction portions 15 made of paper friction material, woven fabric material, or the like are provided in a dot shape at predetermined intervals, and oil is discharged between the friction portions 15 during rotation. An oil groove 17 is formed.

  In addition, although the friction part 15 is provided in both surfaces of the core plate 11, as shown in FIG. 1, you may provide in only one side. In this case, the separator plate 5 is not necessary.

  As shown in FIG. 4, the surface of the friction portion 15 is provided with a plurality of convex portions 19 having a height lower than the groove depth of the oil grooves 17 and a plurality of concave portions 21 having a depth smaller than the groove depth of the oil grooves 17. The convex portion 19 and the concave portion 21 are arranged so as to form a groove 23 on the surface of the friction portion 15.

  In addition, the width | variety of the convex part 19 and the recessed part 21 is about 1.0 mm, and the width | variety of the groove part 23 is about 1.0 mm.

  The material constituting the groove portion 15 is, for example, a known friction material used in a conventional friction plate, and the concave portion 21 is formed by, for example, cutting or weaving long fibers that are friction material materials. The

  FIG. 4 shows an example in which long fibers are woven together, and the protruding portion is formed by overlapping the fibers to form the convex portion 19, and the concave portion without forming the overlapping portion is forming the concave portion 21. .

  Thus, by providing the convex portion 19 and the concave portion 21 on the surface of the friction portion 15 and arranging the convex portion 19 and the concave portion 21 so as to form the groove portion 23 on the surface of the friction portion 15, it is compared with the prior art. Thus, the drag torque can be reduced, and the effect of reducing the biting shock when the friction portion 15 and the separator plate 5 are engaged can be obtained.

  When the friction portion 15 is provided on both the front and back surfaces of the friction plate 1, the groove portion 23 has directionality in the front and back surfaces of the friction plate 1.

  Specifically, the directionality is created in the direction reversed on the front and back surfaces.

  In addition, it is desirable that this directionality is consistent between the front and back of the friction plate 1.

  Next, a method for manufacturing the friction plate 1 will be described.

  First, a core plate 11 is manufactured by punching a plate material such as iron into a ring shape with a press machine or the like.

  Next, the friction part 15 is manufactured.

  Specifically, a paper material or a woven material is punched into a predetermined shape and formed by weaving long fibers that are cutting, press grooving, or friction material, so that the surface has convex portions 19 and concave portions. 21 is formed, and the friction part 15 is manufactured by arranging so as to form the groove part 23.

  Next, the friction portion 15 is adhered to the core plate 11 at a predetermined interval, and the resin is impregnated as necessary to complete the friction plate 1.

  The friction part 15 is formed by forming the oil groove 17, the convex part 19, and the concave part 21 by the above processing method after bonding a paper material or a nonwoven fabric formed in a ring shape onto the core plate 11. May be.

  Thus, according to the present embodiment, the friction plate 1 has the core plate 11 and the friction portion 15, and the convex portion 19 and the concave portion 21 are arranged on the surface of the friction portion 15 so as to form the groove portion 23. Yes.

  Therefore, compared with a prior art, drag torque can be reduced and the effect which reduces the biting shock at the time of the friction part 15 and the separator plate 5 engaging can be acquired.

  That is, the friction plate 1 can reduce the drag torque as compared with the conventional structure due to the above-described structure.

  Hereinafter, based on an Example, this invention is demonstrated further more concretely.

  A friction plate (design example) having the same structure as that shown in FIGS. 2 to 4 was manufactured, and drag torque was compared with a conventional friction plate (comparative example).

  Specifically, the following samples were prepared.

(Design example)
First, an SPCC or S35C equivalent steel material was punched into a ring shape with a press machine to produce a core plate 11 having an inner diameter of 164 mm, an outer diameter of 184 mm, and a thickness of 0.8 mm.

  Next, the friction part 15 was prepared, affixed on the core plate 11, and impregnated with the phenol resin, and the friction plate 1 was manufactured. The shape of one dot is a nozzle shape, and the maximum dimension is 8.2 mm.

  A paper friction material was used as the material of the friction part, and the convex part 19 and the concave part 21 were arranged on the surface of the friction part 15 by cutting so as to form the groove part 23. The width of the convex part 19 and the concave part 21 was 1.0 mm, and the width of the groove part 23 was 1.0 mm.

(Comparative example)
A friction plate was manufactured by the same manufacturing method using the same material as that of the inventive example except that the groove portion was not provided on the surface of the friction portion 15 to obtain a conventional example.

(Drag torque evaluation)
The test apparatus was a known SAE (Society of Automotive Engineers) No. 2 tester, and the drag torque was measured in the range where the differential rotation speed of the friction plate was 200 to 5000 rpm.

  As the lubricating oil, T4 manufactured by Esso was used, the oil temperature was 40 ° C., and the supply amount of the lubricating oil was 1 liter / minute.

  The results are shown in FIG.

  As shown in FIG. 5, the drag torque of the inventive example is smaller in all the differential rotation speed regions than the comparative example, and the drag torque is most reduced particularly at the differential rotation speed of 2000 rpm.

  From the above experimental results, it was found that the friction plate 1 according to the present invention can reduce the drag torque more than before.

  In the above-described embodiment, the case where the friction plate 1 of the present invention is used for an automatic transmission for an automobile has been described. It can be applied to a wet engagement device such as a multi-plate clutch using a wet friction material used in a transmission of an automatic transmission, a torque converter, a starting clutch and the like.

1 ......... Friction plate 3 ......... Drum 3a ... Key groove 5 ......... Separator plate 7 ......... Shaft 7a ... Key groove 11 ... Core plate 13 ... Gear 15 ... Friction part 17 ... Oil Groove 19 ... convex part 21 ... concave part 23 ... groove part 100 ... clutch pack

Claims (5)

A core plate;
Friction portions arranged in a dot shape on the core plate;
Have
The friction part is
It has a plurality of convex portions and a plurality of concave portions on the surface,
The plurality of convex portions and the plurality of concave portions are:
The wet friction plate, wherein the friction plate is arranged so as to form a groove on the surface of the friction portion. Having an oil groove provided between the friction parts,
2. The wet friction plate according to claim 1, wherein the height of the plurality of convex portions is lower than the groove depth of the oil groove, and the depth of the plurality of concave portions is shallower than the groove depth of the oil groove. .   3. The wet friction plate according to claim 1, wherein the groove portions are arranged so as to face a certain direction in a plane of the core plate. The friction part is provided on both surfaces of the core plate,
The wet friction plate according to claim 3, wherein the grooves have the same direction on both sides.   The wet friction plate according to any one of claims 1 to 4, wherein the friction portion is made of a paper friction material or a woven material.

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