JPS5828027A - Power control device equipped with cork friction material - Google Patents

Abstract

PURPOSE:To increase a life of cork friction materials, by applying liquid lubricant, contained in the inside of a cork forming member, with an affinity for cork smaller than an affinity of lubricant applied to a friction surface of the cork forming member. CONSTITUTION:A life of cork friction materials depends on a multiplied product effect of internal liquid lubricant and surface lubricant, and the internal liquid lubricant, contained in the cork friction material, is gradually infiltrated into a surface lubricant layer, applied to a surface of the cork friction material, while in use of said material, to perform action of holding lubrication of a cork surface. The surface lubricant of an affinity to cork larger than of the internal liquid lubricant, contained in the cork, is applied, and the surface lubricant is intruded into a rugged part of cork, then the internal liquid lubricant, contained in the cork, can be prevented from excessive leakage, thus appropriate supply of the internal liquid lubricant to the surface lubricant layer can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power control device equipped with a friction material mainly made of cork.

The friction coefficient used in the braking device of the modele in electric sewing machines, etc. or the clutch facing in the power transmission device used therein must have an appropriate friction coefficient, and the generation of noise or odor from the friction surface during operation. Cork is prized because it has extremely low

However, it had poor wear resistance and had problems in terms of service life.

Therefore, in order to extend the service life,
As seen in Japanese Patent No. 312, a friction material made of cork impregnated with lubricating oil is provided.

Additionally, friction materials in which solid lubricant particles such as molybdenum disulfide are dispersed in an oil film on the surface of such lubricating oil have also been put into practical use in some cases. However, it is still not sufficient in terms of service life, and improvements are desired.

An object of the present invention is to provide a power control device equipped with a cork friction material that has a long service life.

The friction-based power control device of the present invention includes a cork molded body and a liquid or semi-solid lubricant (hereinafter referred to as
Abbreviated as surface lubricant. ) and a liquid lubricant (abbreviated as internal liquid lubricant) contained inside the friction surface of the cork friction material. It is characterized by being a liquid lubricant that has a lower affinity for cork than liquid or semi-solid lubricants applied to the friction surface of a cork molded body.

Next, the present invention will be explained with reference to the drawings. FIG. 1 shows a sectional view of the main parts of a power control device according to an embodiment of the present invention, and is a partial sectional view of a modele with a clutch and a brake. A flywheel 3 to which a clutch disk 2, which is a clutch component, is fixed is fixed to one end of a rotor 1 of a driving mode. The end bracket 4 has a clutch electromagnetic frame 5 having a clutch coil.
, a brake electromagnetic frame 6 having a brake coil, and a brake disc 7 are held. It also has a pulley 9 that takes out the output via a bearing 8, and a sliding shaft 10 at the other end.
It supports an output shaft 11 having a spline shaft or the like. The clutch armature 14 and the brake armature 15, which respectively hold the clutch lining 12 and the brake lining 3, are movable in the axial direction on the sliding shaft 10, and are held so that there is no relative movement in the rotational direction. They are connected by a coupling 16.In operation, the rotor 1 of the modle constantly rotates, and the flywheel 3 fixed to the other end stores rotational energy, and when the clutch coil 17 is energized, the clutch side A magnetic circuit 18 is generated, the clutch armature 14 is attracted to the clutch disk 2, and the rotational power is taken out to the pulley 9 via the clutch lining and the sliding shaft 10 and output shaft 11, and becomes driving force. On the other hand, in the event of a power outage, the brake side magnetic circuit 20 is generated by energizing the brake coil 19, the brake armature 15 is attracted to the brake disc 7, and the sliding shaft 10 is moved through the brake lining 13 and the brake armature 15. The pulley 9 is stopped by a braking force caused by friction between the output shaft 11 and the brake disc 7 fixed to the pulley side end bracket 4.The present invention is directed to the clutch lining 12 or brake lining 13 in this type of device. In other words, a material mainly made of cork as described above is attached as a friction material.

The reason why the life of the above-mentioned cork friction material in the present invention is improved is as follows. That is, the life of the cork friction material is due to the synergistic effect of the internal liquid lubricant and the surface lubricant.

The internal liquid lubricant contained in the cork friction material gradually leaches into the surface lubricant layer applied to the surface of the cork friction material during use.
Replenishment) It acts to maintain the lubricity of the cork surface. The amount supplied to the surface lubricant layer varies depending on the affinity of the internal liquid lubricant contained in the cork friction material for cork. If the internal liquid lubricant leaches out excessively, a thick oil film layer is formed under the surface lubricant layer applied to the cork friction surface, resulting in the surface lubricant layer disappearing from the friction surface. However, by applying a surface lubricant that has a higher affinity for the cork than the internal liquid lubricant contained in the cork, the surface lubricant will penetrate into the cork's uneven parts and prevent excessive leakage of the internal liquid lubricant contained in the cork. This is presumed to be because the internal liquid lubricant is appropriately replenished into the surface lubricant layer.

In the present invention, the internal liquid lubricant and the surface lubricant may have different affinities for cork and may be used together. Some examples are given below. Mineral oil, diester oil, neopentyl polyol ester oil, polybdenum oil, polyglycol oil, fluorine oil, polyphenyl ether oil, alkylbenzene oil. Among these, combinations having different affinity for cork can be arbitrarily selected. Particularly preferred as surface lubricants are viscous lubricants, such as graphite, molybdenum disulfide, tungsten disulfide, perforated boron, organomolybdenum, graphite fluoride, metal oxides and bentonites, silica gel, dyes (copper caps, etc.). , Indusren).

It is a semi-solid compound containing a solid lubricant such as polyurea and a thickener. In addition, the viscosity of the internal lubricant used is 210' F (98.9 tl, 3 to 80 2/S). From the viewpoint of the iJ performance and braking performance of the cork friction material, the viscosity is 3.5 to 2/S. Particularly preferred are those with BOmm2/S.

At least a little bit of surface lubricant and internal liquid lubricant,
If necessary, antioxidants such as amine compounds, phenol compounds or sulfur compounds, and rust preventive agents such as carboxylates and sulfonates may be added.

The cork molded body as used in the present invention is a chip or powdered cork molded into a predetermined shape using an adhesive.

The internal liquid lubricant can be contained inside the cork molded product by adding the liquid lubricant to the mixture of cork and adhesive before molding, or by adding the liquid lubricant to the mixture of cork and adhesive before molding, or by adding the liquid lubricant to the mixture of cork and adhesive before molding, or by adding it to the mixture under normal pressure or reduced pressure after molding. A method of impregnating at the bottom can also be adopted.

The power control device equipped with a cork friction material as used in the present invention refers to the brake device and clutch device as shown in the above-mentioned drawings, as well as the J.
: Una Railway Car Bogie Pitching Prevention Device 9 Refers to a disc pad used for the dehydration tank of a dehydrating washing machine or the disc brake of a machine tool, etc.

Next, examples of the present invention will be shown. The amount of solid lubricant added (capacity) in each of the following examples is a value based on the total volume of the composition.

Example 1 85 parts by weight of cork grains having a particle size in the range of 300-500 II m, 15 parts by weight of phenolic adhesive, 5 parts by weight of glycol (softener) and 210° 1-(98,
26 parts by weight of a polyolefin oil (containing antioxidant nickel nidibutyldithiocarbamate 0.5% by weight) having a viscosity in the range of 24 to 10], 2/S (average molecular weight Mn 300 to 2100) at After mixing, put into a mold and pressurize and compress (], OK9/cm
21 L, 130 tl? A cork board with a thickness of 10 m was obtained by heat molding at a temperature of about 2 hours. 14 from this cork board
A cork piece cut out to the dimensions of x14m+n, thickness 5mm, inner diameter 68 holes, outer diameter 96fi.

A ring-shaped cork molded product with a thickness of 5 cm was made. 6% by volume of graphite and 54% molybdenum disulfide per ml of this cork molded product.
Apply polyalkylene glycol oil (semi-solid lubricant) mixed with volume%, and test using a pin-disk friction tester.
The coefficient of friction, which is related to durability and braking performance, was measured.

Evaluation of durability performance and friction coefficient using a pin-disk friction tester was conducted under the following conditions.

[Durability test]

Sliding speed: 13m/S Surface pressure: 0.5 Kgf/cm2 Disk surface temperature: 100t? (Metal plate temperature) Under the above conditions, evaluation was made based on the operating time until the surface lubricant applied to the surface of the cork material was consumed due to continuous sliding friction.

[Brake performance test]

Sliding speed: 0.9m/S Surface pressure' 05 K9 f/Crn2 [Practical performance test] Typical usage conditions of an electric sewing machine were simulated, and the actual machine shown in the figure was simulated under deceleration, stop, and constant slipping motion. Using the clutch/brake mode, the two operations were considered to be one cycle, and the evaluation was made by the number of operation cycles until the surface lubricant applied to the cork surface was exhausted.

The measurement results are shown in Table 1. In order to clarify the advantages of the present invention, a comparison was made with what was conventionally used.

Table 1 *Surface lubricant: Mineral oil (viscosity 2100F (98,9c)
98 fin 2/S), containing 45% graphite by volume From Table 1, the dynamic friction coefficient, durability performance, and practical performance of the cork friction material containing polyolefin oil are as follows:
It can be seen that it is superior to conventional products.

Example 2 A test piece cut out from a cork board molded under the conditions described above using the same particle size, softener, and adhesive as in Example 1 was coated with polyolefin oil (average molecular weight = 300 to 210) shown in Table 2.
0) under reduced pressure at 20% by weight (based on total weight including cork)
impregnated with. Furthermore, Example 1 was added to the above cork test piece.
After applying a surface lubricant having the same composition as in Example 1, the test was conducted under the same conditions as in Example 1. The results are shown in Table 2.

(11) Table 2 Example 3 Example from a cork plate obtained by molding using the same softener and adhesive as in Example 1 using cork grains having a particle size within the range of 1100 to 120011 m. A test piece with the same dimensions as 1 was prepared, and 1 part of the internal liquid lubricant shown in Table 3 was added to it.
0% by weight (based on the total weight including cork) was impregnated. Next, the same surface lubricant as in Example 1 was applied to the friction surface, and the wear coefficient and surface j
Longevity performance (12) was evaluated. The results are shown in Table 3.

Table 3 (g) shows the viscosity at 210°F (98,9C): 82
/S is indicated.

Example 4 A polyalkylene glycol oil containing 5% by weight of the thickener shown in Table 4 (0 nickel dibutyl dithiocarbamate as antioxidant) was applied to the surface of the same cork test piece as in Example 1.
, 5% by weight) was added with 6% by volume of graphite and 54% by volume of molybdenum disulfide, and the resulting surface lubricant was uniformly dispersed using a roll machine. It was applied to the friction surface of a cork containing 10% by weight of polyolefin (13) oil of 20.6 2/5 (210°F), and the dynamic friction coefficient and durability were measured using a pin-disk friction tester under the same conditions as in Example 1. Performance and practicality were evaluated using the clutch/brake mode for electric sewing machines shown in Figure 1. The results are shown in Table 4.

Table 4 As is clear from Table 4, the durability and practical performance of the greases using any of the thickeners are significantly superior to those of the conventional products shown in Table 1. Ru.

[Brief explanation of drawings]

The figure is a sectional view of the main part (14) of a clutch/brake equipped model used in an industrial sewing machine or the like according to an embodiment of the present invention. ■...Rotor, 2...Clutch disc, 3...
Flywheel, 4... Pulley side end bracket, 5... Clutch electromagnetic frame, 6... Brake electromagnetic frame, 7... Brake/ki disc, 8... Bearing, 9...
...Pulley, 10...Sliding shaft (spline shaft), 1
1... Output shaft, 12... Clutch lining, 13
... Brake lining, 14... Clutch armature, 15... Brake armature, 16... Coupling, 17... Clutch coil, 18... Clutch side magnetic circuit, 19 (15) /// /θ and the continuation of the first page (tz Inventor Tomio Yoshida Hitachi, Ltd., 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo

Claims (1)

[Scope of Claims] 1. A friction method comprising a cork molded body, a liquid or semi-solid lubricant layer applied to the friction surface thereof, and a cork friction material containing the liquid lubricant contained from the friction surface to the inside. In the power control device, the liquid lubricant contained inside the cork molded body is a liquid lubricant that has a lower affinity for cork than a liquid or semi-solid lubricant applied to the friction surface of the cork molded body. Power control device equipped with cork friction material. 2. Claim No. 2, characterized in that the liquid or semi-solid lubricant applied to the friction surface of the cork molded body is grease, and the liquid lubricant contained inside the cork molded body is hydrocarbon oil. A power control device comprising the cork friction material according to item 1.