JPH07253122A - Manufacture of frictional plate or mating plate - Google Patents

Abstract

PURPOSE:To provide a manufacture of a frictional plate or a mating plate which improves mu-V characteristic between the frictional plate and the mating plate in a frictional engagement device in an initial stage of usage, and reduces transmission shock, shudder, and engagement abnormal noises. CONSTITUTION:Solution is prepared so as to contain one or two friction adjusting agents selected from fatty acid friction adjusting agent, amine friction adjusting agent, alcohol friction adjusting agent, ester friction adjusting agent and metal sulfonate friction adjusting agent used as additive to automatic transmission oil. A frictional plate 14 or a mating plate 20 is impregnated with the solution. The friction adjusting agents are subjected to impregnation or adhesion to the surface of the frictional plate 14, and adhesion to the surface of the mating plate 20. The friction adjusting agent is confirmed in its function to improve mu-V characteristic of the frictional plate 14 or the mating plate 20 through experiment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction engagement element used for a multiple disc clutch, a multiple disc brake or a band brake in a wet friction engagement device for an automatic transmission or a transfer clutch, that is, a friction plate or a mating member. The present invention relates to a method for manufacturing a plate.

[0002]

2. Description of the Related Art A wet multi-plate clutch is a typical example of a friction engagement device. The wet multi-plate clutch is configured by alternately arranging friction plates to which a wet friction material is fixed and steel mating plates.

Conventional wet friction materials include paper type, elastomer type, graffiti mold type and sintered alloy type. The paper-type wet friction material is usually obtained by impregnating a sheet prepared by a wet papermaking method or a dry papermaking method with a thermosetting resin and curing and molding. The elastomer-type wet friction material is generally obtained by mixing a synthetic rubber binder such as NBR or fluororubber with a filler (processing aid, reinforcing agent, friction modifier, etc.) and curing and molding. Graffiti mold type wet friction material is generally 50-85 wt% carbon,
It is obtained by mixing 15 to 50 wt% of a thermosetting resin binder and 5 to 30 wt% of another friction modifier and curing and molding. Sintered alloy type wet friction material is generally a copper alloy 50
It is obtained by mixing 5 to 50 wt% of a friction modifier (carbon, inorganic filler material) or the like in an amount of at least wt% (including pb) and heating and molding.

[0004]

However, the conventional friction material has a μ-V characteristic (static-dynamic ratio) in the initial stage of use, that is, in the process of becoming familiar with the mating plate.
Is not good (the μo / μ1800 ratio is large), there is a problem that gear shift shock, shudder (friction vibration), and engagement noise are generated. The same problem occurs with the mating plate.

In order to deal with these problems, after the manufacture of the friction plate or the measuring plate is completed, lapping (leveling by slipping or repeatedly engaging) is performed, or the surface of the friction material or the surface of the measuring plate is processed. There is a method of polishing or carbonizing a friction material composition such as a binder. However, these measures cause another problem that a large amount of equipment is required or the number of steps is increased because mechanical processing or heat treatment processing is further required after the production of the friction plate or the mating plate is completed.

As a result of experiments, it was found that the friction modifier of the automatic transmission oil improves the μ-V characteristic in the initial stage of use. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a friction plate or a measuring plate, which can suppress the occurrence of gear shift shock, shudder and engagement noise by using a friction modifier for automatic transmission oil. .

[0007]

SUMMARY OF THE INVENTION The present invention is, firstly, a friction plate comprising a friction material fixed to a core metal, which is a fatty acid type friction modifier used as an additive for an automatic transmission oil, amine. Immersing the friction material in a solution containing one or more friction modifiers selected from the group consisting of friction modifiers based on alcohol, friction modifiers based on alcohol, friction modifiers based on ester and friction modifiers based on metal sulfonate The above-mentioned problems are solved by a method for manufacturing a friction plate characterized by:

Secondly, the present invention relates to a fatty acid friction modifier, an amine friction modifier, an alcohol friction modifier, an ester friction modifier and a metal sulfonate friction modifier used as an additive for an automatic transmission oil. The above problems were solved by a method for producing a plating plate, in which the plating plate is immersed in a solution containing one or more friction modifiers selected from the group consisting of agents.

[0009]

[Function] The friction plate to be immersed is a paper type,
Elastomer type, graffiti mold type,
Any wet friction material of the sintered alloy type may be used. In the case of the mating plate, it is made of conventional steel.

The solution containing the friction modifier is a fatty acid friction modifier, an amine friction modifier, an alcohol friction modifier, an ester friction modifier, and a metal sulfonate which are used as additives for automatic transmission oils. 1 friction modifier
Alternatively, it is a solution containing two or more. The friction modifier itself or the friction modifier diluted with a base oil or an automatic transmission oil may be used. Examples of base oils include isoparaffin, cycloparaffin, monocyclic aromatic hydrocarbons,
A viscosity modifier is included if necessary. Examples of automatic transmission fluids include Apolloyl ATF D-3 (manufactured by Idemitsu Kosan Co., Ltd.), Apolloyl ATF M-3 (manufactured by Idemitsu Kosan Co., Ltd.), Castle Autofluid (manufactured by Esso Oil Co., Ltd.), Diamond AFT Dexron (Mitsubishi Petroleum Corp.). Made).

As the fatty acid-based friction modifier, an olefin-based or paraffin-based friction modifier, a friction modifier such as acrylic acid, oleic acid or stearic acid can be used. As the amine-based friction modifier, amine salts of phosphate, cetylamine, polybutenyl succinimide polyamine, benzylamine and the like can be used. As the alcohol-based friction modifier, oleyl alcohol, lauryl alcohol, cetyl alcohol and the like can be used. As the ester-based friction modifier, phosphoric acid ester, thiophosphoric acid ester, dicarbamic acid ester and the like can be used. As the metal sulfonate-based friction modifier, friction modifiers such as calcium sulfonate, magnesium sulfonate and barium sulfonate can be used.

The friction plate or mating plate is immersed in the friction modifier solution prepared as described above under atmospheric pressure for about 5 minutes. The theoretical basis for producing a certain action and effect by the method of the present invention is not always clear,
The friction modifier is impregnated or adsorbed on the friction material, the friction modifier is adsorbed on the mating plate, and the friction modifier present on the surface of the friction material or the mating plate is used during friction engagement at the initial stage of use. It is considered to improve the μ-V characteristic.

Incidentally, the friction modifier sometimes reduces the coefficient of static friction excessively. In such cases,
By using the base oil or the automatic transmission oil to adjust the concentration of the friction modifier to 10 to 50 wt%, it is possible to suppress the reduction of the static-dynamic ratio.

Further, by raising the temperature of the friction modifier solution, it is possible to promote the adsorption of the friction modifier to the friction material and the mating plate. For example, 100 ℃
The use of the friction modifier solution can increase the adsorption amount of the friction modifier and shorten the immersion time.

[0015]

1 and 2 show a friction plate 10. The friction plate 10 includes a core metal 12 and a friction material 14 fixed to the core metal 12.
Immersion is performed after fixing the friction material 14 to the core metal 12, that is,
It is performed at the final stage of the manufacturing process of the friction plate 10. 3 and 4 show the mating plate 20. Immersion is performed at the final stage of the manufacturing process in which deburring and the like have been completed.

An experiment was conducted to confirm how much the friction plate or the mating plate according to the method of the present invention actually improved the performance. FIG. 5 shows SAE No.
2 shows a friction tester. Mating plate 20
The friction plate 10 is fitted in the case 22, and the friction plate 10 is fitted in the spline on the shaft 24. A motor 28 is provided on the shaft 24 via an inertia 26. Table 1 shows the test conditions
Is the street.

[0017]

[Table 1]

The test products are as follows. (A) Both the friction plate and the mating plate are conventional products. The friction material of the friction plate was manufactured by impregnating and hardening a base paper sheeted by a wet papermaking method with a phenolic resin. The mating plate is a single plate made of steel. (B) A friction plate having a friction material fixed thereto, which is immersed in an amine salt of phosphate at room temperature for 5 minutes, and the above-mentioned conventional mating plate. (C) A friction plate of the above-mentioned conventional product and a mating plate which is immersed in an amine salt of phosphate at 120 ° C. for 30 minutes.

Then, the relationship (torque waveform) between the relative rotational speed between the friction plate and the mating plate and the transmitted torque was obtained. 6 and 7 show torque waveforms obtained as a result of testing the test products (a), (b) and (c). From the torque waveform, the friction coefficient (μ1800) when the relative speed is 1800 rpm and the friction coefficient (μo) when the relative speed is Or.pm and the ratio μo / μ1800 are calculated as a representative of μd. Summarized in 2.

[0020]

[Table 2]

From these experimental results, the following improvements in friction performance were confirmed. FIG. 6 shows the dipping-treated friction plate (b) and the dipping-treated mating plate (c).
Further, as shown in FIG. 7 and Table 2, the μ-V characteristic (ratio of μo / μ1800) is 0.1 to 0.1 as compared with the conventional product (a).
It becomes about 0.3 smaller. This means that dipping the friction plate or the mating plate with the solution containing the friction modifier can alleviate the shock at the time of shifting in the automatic transmission. Further, in applications such as a slip lock-up clutch and a transfer clutch where the friction plate and the mating plate are slid in a low speed range, it is possible to prevent the occurrence of initial shudder.

In addition to the above friction modifiers, finate type, salicylate type, succinimide type, zinc thiophosphate type, sulfurized olefin type, phosphate type, alkyl sulfide type, carboxylic acid type, molybdenum compound type, The effect of preventing the occurrence of shudder, shift shock and abnormal noise is also recognized for the naphthene type additive.

[0023]

According to the present invention, since the friction plate or the measuring plate is immersed in the solution containing the friction modifier, the mechanical or thermal treatment conventionally required is not required. Therefore, there is an effect that large-scale equipment and complicated man-hours can be greatly simplified and simplified. Further, it is possible to prevent the occurrence of shudder, shift shock, and abnormal noise that occur at the initial stage of use, more than or equal to the conventional processing.

[Brief description of drawings]

FIG. 1 is a sectional view of a friction plate.

FIG. 2 is a plan view of a friction plate.

FIG. 3 is a sectional view of a mounting plate.

FIG. 4 is a plan view of a mating plate.

FIG. 5 is a partial cross-sectional view of a SAE No2 friction tester.

FIG. 6 is a graph showing the relationship between the rotation speed and torque of the first cycle of each test product.

FIG. 7 is a graph showing the relationship between the rotation speed and the torque at the 100th cycle of each test product.

[Explanation of symbols]

 10 Friction plate 14 Friction material 20 Measuring plate

Claims (2)

[Claims] 1. A method of manufacturing a friction plate comprising a friction material fixed to a core metal, the method comprising: a fatty acid friction modifier, an amine friction modifier, and an alcohol friction modifier used as an additive for an automatic transmission oil. Of a friction plate, wherein the friction material is immersed in a solution containing one or more friction modifiers selected from the group consisting of agents, ester-based friction modifiers and metal sulfonate-based friction modifiers. Method. 2. A fatty acid-based friction modifier, an amine-based friction modifier, an alcohol-based friction modifier, an ester-based friction modifier, and a metal sulfonate-based friction modifier used as an additive for an automatic transmission oil. A method for producing a mating plate, comprising immersing the mating plate in a solution containing one or more friction modifiers.