JPS62127519A - Manufacture of friction material - Google Patents

Abstract

PURPOSE:To raise a friction factor in a friction material as well as to improve a magnetic characteristic, by mixing a magnetic material in the friction mate rial, while adding a magnetic field to it at the time of sintering or casting or afterward, and treating it for manufacturing. CONSTITUTION:A clutch plate 6 connected to a shaft 5 with a spline and a clutch 8 attached to the housing 10 locked to a driven shaft 2 are alternately installed in a parallel manner, and each surface is covered with friction materials 7 and 9. These friction materials 7 and 9 are opposed to each other with a minute clearance and rotation of a driving shaft 1 is not transmitted to the driven shaft 2, but when a coil 4 is excited, these clutch plates 6 and 8 are attracted with each other, whereby its rotation is transmittable by friction grip joints of these friction plates 7 and 9. These friction materials 7 and 9 are manufactured after being treated in a magnetic field at the time of sintering or casting of the friction material mixed with a magnetic material, or afterward. Therefore, with treatment in the magnetic field, magnetic spins are put in order and, what is more, both magnetic and frictional characteristics are improvable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention applies pressure to the friction surfaces of members such as brakes and clutches, and provides I! i! This invention relates to an improvement in a method for manufacturing S raw material used in a friction device that is intermittent by rubbing.

[Problems with conventional technology]

Conventionally, it has been known to sinter a magnetic material with a large coefficient of friction into a friction plate for use in magnetic clutches and magnetic brakes, but there is a limit to this because the amount of Fe is increased in order to improve the magnetic properties of the material. As this increases, the mixed amount of CU, C, etc. decreases, resulting in a decrease in the coefficient of friction.

[Means for solving problems]

In view of the above points, the present invention is designed to increase both magnetic properties and frictional properties, and involves mixing a magnetic material into a friction material and applying a magnetic field during or after sintering or casting. Features.

〔Example〕

First of all, the present invention! An example of a clutch using II material will be described. 1 is a drive shaft, 2 is a driven wheel, and a clutch for intermittent control is provided between the two. 3 is a magnetic iron core fixed to the drive shaft, 4 is its excitation coil, 5 is a shaft coaxial with shaft 1.2 and fixed to iron core 3, 6 is a clutch plate spline-coupled to shaft 5, Reference numeral 8 denotes a clutch plate attached to a housing 10 fixed to the driven shaft 2. Both clutch plates 6 and 8 are arranged alternately in parallel, and each surface is coated with a friction material 7.9.

The clutch plates 6.8 to which the friction materials 7 and 9 are fixed face each other with a small gap, and when the magnets are not energized, they fit loosely and the rotation of the drive shaft 1 is not transmitted to the driven shaft. Therefore, when the coil 4 is energized, the clutch plates 6, 8 are attracted to each other, and the frictional coupling between the friction plates 7, 9 allows rotational force to be transmitted to the driven shaft 2 without loss.

The friction materials 7 and 9 coated on the surfaces of the clutch plates 6.8 are I! which is a mixture of magnetic materials. ! It is manufactured by processing raw material for friction material during curing or casting, or afterward in a magnetic field. During or after sintering or casting, it is preferable to maintain the temperature above a certain level to cause spinodal transformation. Magnetic spins can be aligned by treatment in a magnetic field, thereby improving magnetic properties and frictional properties.

For example, in the friction material, 84% Fe, 4% Cu, 5% Pb,
A mixture of 600 mesh powder of 2% 5N and 5% C was sintered. The as-sintered material A and the sintered material A were treated by holding at 800°C for 1 hour in a 2400G magnetic field perpendicular to the sintered plate surface. When the II friction coefficient was measured for each sintered C1 while applying a magnetic field, the results were as follows.

Friction coefficient A, i, 4 B, 2.8 C, 3, 1 It can be seen that the friction coefficient is improved by 2 to 3 times by treatment in a magnetic field. What's more, the magnetic property improvement treatment that aligns the spins in one direction increases the magnetic adsorption force of the friction material. A high-performance friction clutch with increased friction force can be obtained.

When the clutch plate 6.8 in the above embodiment was coated with the friction material treated in the magnetic field, the excitation current could be reduced to about 115 to operate the same friction clutch.

Note that the present invention can be used not only for clutches but also for brakes and other friction members.

〔Effect of the invention〕

As described above, the present invention mixes a magnetic material into a friction material,
Since a magnetic field is applied during or after sintering or casting, the friction coefficient of the friction material can be increased, and at the same time, the magnetic properties can be improved, increasing the magnetic adsorption force and friction. II friction raw material with increased strength can be easily obtained, and high-performance magnetic brakes and magnetic clutches can thereby be obtained.

[Brief explanation of drawings]

The drawings are examples of friction materials obtained according to the present invention. １・・・・・・・・・Drive shaft 2.......driven shaft ４・・・・・・・・・Exciting coil 6.8・・・・・・・・・Clutch plate 7.9・・・・・・Friction material Patent applicant

Claims (1)

[Claims] In the production of friction materials used in friction devices such as brakes and clutches that connect clutch plates, brake plates, etc. magnetically and are disconnected by friction between the two, a magnetic material is mixed into the friction material during or after sintering or casting. A method for manufacturing a friction material, characterized by applying a magnetic field to the material.