JP2012057712A - Separator plate of wet type multi-plate clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separator plate of a wet type multi-plate clutch that does not make the structure of the wet type multi-plate clutch complicated, improves a friction coefficient, and has a large torque capacity.SOLUTION: The separator plate 10 of the wet type multi-plate clutch is formed by coating a metallic base material 14 with a polymer 12 which is a thermosetting resin or a thermoplastic resin. The torque capacity of the wet type multi-plate clutch can be increased by improving the friction coefficient of the separator plate 10 by coating the base material 14 with the polymer 12, without making the structure of the wet type multi-plate clutch complicated, and also without having an effect on the magnitude and weight of the plate.

Description

  The present invention relates to a separator plate of a wet multi-plate clutch used in a power transmission device that transmits and cuts power in lubricating oil.

In an automatic transmission of an automobile, a multi-plate clutch in which friction plates and separator plates are alternately arranged is incorporated, and these plates are pressed against each other in an ATF (automatic transmission fluid) used as a lubricating oil. The driving force is transmitted or cut off by frictional engagement and release from the pressure contact.
Patent Documents 1 and 2 show examples of wet multi-plate clutches in which some processing is applied to the separator plate.

JP-A-8-247190 JP 2002-147491 A

Patent Document 1 discloses a friction clutch including a separator plate in which a separator plate is subjected to chrome plating and an engagement surface with a friction plate is covered with an organosilicon compound having a siloxane bond. According to the invention of Patent Document 1, by using such a separator plate, it is said that the durability of the separator plate and the friction plate can be improved and the stick-slip phenomenon caused by the friction coefficient and minute fluctuation can be prevented.
In the invention of Patent Document 2, a plurality of separator plates are arranged between the friction plates, and the surfaces of the separator plates facing each other are subjected to coating treatment or surface treatment. According to Patent Document 2, by arranging a plurality of separator plates, the occurrence of heat spots (thermal deformation) can be prevented, and each separator plate can be formed by performing coating treatment or surface treatment on the mutually facing surfaces of the separator plates. It is said that heat insulation, vibration suppression, and shock absorption between them work.

  One of the problems of the wet multi-plate clutch is the torque capacity. Of course, it is desirable that the torque capacity can be increased without complicating the structure of the wet multi-plate clutch. However, Patent Documents 1 and 2 do not disclose a method for increasing the torque capacity. The invention of Patent Document 2 also has a problem that the weight of the wet multi-plate clutch is increased by disposing a plurality of separator plates between the friction plates.

  Accordingly, an object of the present invention is to provide a separator plate that can improve the coefficient of friction and increase the torque capacity of the wet multi-plate clutch by coating the separator plate with a polymer.

The present invention is a separator plate used in a wet multi-plate clutch,
The above problems have been solved by a separator plate of a wet multi-plate clutch, wherein a polymer is coated on at least a surface of the separator plate that engages with a friction material.
Moreover, if the filler is added to the polymer as in claim 2, the durability of the separator plate is improved.

  According to the present invention, since the coefficient of friction is improved by coating the polymer on the separator plate, the torque capacity can be increased without complicating the structure of the wet multi-plate clutch.

Schematic of the separator plate of the present invention. The figure which shows the measurement result of (micro | micron | mu) s and microd of Examples 1-4 and a comparative example. The figure which showed the abrasion loss of the friction material of the wet multi-plate clutch which uses the separate plate of Examples 1-4 and a comparative example.

First, an outline of the separator plate of the present invention will be described with reference to FIG.
The separator plate 10 is formed by coating a base material 14 with a polymer 12. As the polymer 12, it is preferable to use a thermosetting resin or a thermoplastic resin. Specifically, when a thermosetting resin is used, a phenol resin, an epoxy resin, an unsaturated polyester resin, an alkyd resin, or the like. When a thermoplastic resin is used, a fluorine resin, polyphenylene sulfide, polyimide, general-purpose plastic, or the like. It is good to use.
Furthermore, various modified resins of the above resins may be used.
For the base material 14, a metal or an alloy such as iron or aluminum is used.
In FIG. 1, the polymer 12 is coated on the entire base material 14, but the coating may be performed only on the surface that engages with the friction plate.

  Moreover, you may add a filler to the polymer 12 as needed. Thereby, the durability of the separator plate 10 can be improved. When using inorganic fillers, diatomaceous earth, graphite, activated carbon, carbon black, carbon fibers, carbon nanotubes, glass fibers, talc, molybdenum disulfide, sepiolite, etc. should be used, and when using organic fillers It is preferable to use fine organic fibers such as rubber powder / cellulose, aramid, polyester, polyethylene, acrylic and rayon.

Next, a method for coating the base material 14 with the polymer 12 will be described.
The polymer 12 is coated on the substrate 14 by a dipping method. The dipping method refers to a method in which a substrate is dipped in a coating liquid (liquid polymer), then the substrate is pulled up, and the coating liquid (liquid polymer) is applied to the substrate. The polymer 12 can have a desired film thickness by adjusting the viscosity of the liquid polymer and the speed at which the substrate 14 is pulled up from the liquid polymer.
In addition to the dipping method, a general coating method such as spray or roll coater may be applied.

  Hereinafter, the separator plate of the present invention will be specifically described by way of examples. However, the present invention is not limited to these examples.

Example 1
Separator plate coated with phenolic resin.
(Example 2)
Separator plate coated with a material in which carbon black is added to phenolic resin.
Example 3
Separator plate coated with a material in which carbon fiber is added to phenolic resin.
Example 4
Separator plate coated with polyimide.
(Comparative example)
Separator plate not coated with polymer (conventional product).

  Table 1 shows the requirements for the durability test conducted for each example and comparative example, and the measurement requirements for μs (static friction coefficient) and μd (dynamic friction coefficient) after the test. The durability test was performed for 200 cycles.

FIG. 2 shows the measurement results of μs and μd in each example and comparative example. μs was calculated based on the value after 2 seconds from the maximum value of torque.
As shown in FIG. 2, it can be seen that each example has higher μs than the comparative example. μd is equal to or higher than that of the comparative example in Examples 1, 2, and 3, but Example 4 is lower than that of the comparative example. Since the separator plate of the comparative example was not coated with polymer, both μs and μd were lower than those of the examples except for Example 4 of μd. Since the torque capacity is related to μs rather than μd, Example 4 also achieves the object of the present invention to increase the torque capacity.

FIG. 3 shows the amount of wear of the friction material of the wet multi-plate clutch using the separator plates of the examples and comparative examples.
As shown in FIG. 3, the difference in the amount of wear between each of the examples and the comparative example is in the range of 15 μm, and it can be seen that coating the polymer does not significantly affect the amount of wear of the friction material. .

  As described above, according to the present invention, the coefficient of friction can be improved by coating the polymer on at least the surface of the base plate of the separator plate that engages with the friction plate. Therefore, the torque capacity can be increased without complicating the structure of the wet multi-plate clutch and without affecting the size and weight. Moreover, if a filler is added to the polymer, the durability of the separator plate can be improved.

10 Separator plate 12 Polymer 14 Base material

Claims (3)

A separator plate used in a wet multi-plate clutch,
A polymer is coated on at least a surface of the base plate of the separator plate that engages with the friction plate,
Separator plate for wet multi-plate clutch.   The separator plate of the wet multi-plate clutch according to claim 1, wherein a filler is added to the polymer.   The separator plate of the wet multi-plate clutch according to claim 1 or 2, wherein the polymer is a thermosetting resin or a thermoplastic resin.

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