JPS62165065A - Friction wheel - Google Patents

Abstract

PURPOSE:To prevent heat generation due to slippage and improve transmission capacity by forming the contact surface of a friction wheel with a molded item in which 0.1-10wt% of silicone oil is added and mixed to an elastomer having affinity for said silicone oil. CONSTITUTION:The friction surfaces of friction wheels A, B are formed with an elastomer. The elastomer is formed with an item in which 0.1-10wt% of silicone oil such as polysiloxane, etc. is valcanized to an elastomer material such as urethane, etc. having affinity for silicone oil. Its surface friction coefficient can be adjusted by the adding quantity of the silicone oil, enabling the friction coefficient on the contact surface to be adjusted without varying the hardness and elasticity modules of the elastomer. Accordingly, a friction wheel with high transmission capacity can be obtained without increasing contact pressure while preventing heat generation, etc. due to surface friction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a friction wheel, and more particularly to an improvement in a friction wheel molded using elastomer as a molding material.

[Conventional technology]

Conventionally, as shown in Fig. 4, in a continuously variable transmission, two discs A and B are brought into contact with their rotating axes A, B, orthogonal to each other, and the surface of one disc A is contacted. The other disc B
A device is known that enables continuously variable speed transmission by making it movable in the axial direction.

The continuously variable transmission device using friction as described above has discs A,
Since the magnitude of the coefficient of friction at the mutual contact surfaces of B greatly affects the transmission performance, from this point of view, the mutual contact surfaces At and Bz of the friction wheels are made of materials with high friction coefficients such as urethane rubber, natural rubber, chloroprene rubber, etc. May be molded from elastomer.

[Problems with conventional technology]

However, in the continuously variable transmission device as described above,
Since disc B contacts the other disc with a constant width S relative to the surface, slip is always generated on the frictional contact surface between the two due to the difference in the radius of rotation according to the width S, and this slip There has been a problem that various adverse effects occur due to this.

In other words, if the friction wheel is made of an elastomer with a large coefficient of surface friction, the transmission performance will be improved at times such as starting even with a small contact pressure, but as high-speed transmission is achieved, mechanically unavoidable slip will be proportional to the contact surface. This has the disadvantage that the heat generation causes melting and adhesion of the elastomer material, leading to the premature end of its useful life.On the other hand, if the surface friction coefficient is lowered by decreasing the hardness of the elastomer, etc. Although the disadvantages caused by frictional heat generation are improved, the contact pressure between the two must be increased in order to improve the transmission performance, and the mechanism for this is large-scale, making it necessary to sacrifice the size and weight of the device. There was a problem with it disappearing.

By the way, for the device shown in Fig. 4, running tests were conducted under various usage conditions using Fj friction wheels made of materials and hardness shown in Table 1, and the results are shown in column 18 of Table 1. It was found that there is still room for improvement in terms of service life and transmission performance.

Table 1 In view of the above-mentioned problems, the present invention has been made for the purpose of providing a friction wheel that can reliably prevent heat generation due to the inevitable slip in the mechanism of the friction wheel and has good transmission performance.

C. Technique for Solving Problems] That is, the friction wheel of the present invention is characterized in that it is formed from a mixture obtained by adding and mixing 0.1 to 10% by weight of silicone oil to an elastomer that has an affinity for silicone oil. It is something to do.

[Effect]

Silicone oil is known to be useful as a material that imparts low friction properties to substances.

Therefore, by uniformly mixing this silicone oil into an elastomer material, it is possible to adjust the surface friction coefficient of the elastomer material while keeping the hardness of the elastomer material constant by adjusting the amount added.

However, silicone oil and elastomer materials do not necessarily interact with each other chemically or physically, or are not necessarily compatible with each other, and incorrect compatibility may actually reduce the physical properties such as the strength of the molded article.

Therefore, the elastomer material should be one that has affinity with silicone oil and has excellent mechanical strength after molding.
In addition, a material whose hardness can be appropriately selected is used.

Such elastomer materials include urethane rubber, natural rubber (NR), and styrene-butadiene rubber (SBR).
, butyl rubber (BR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), chlorosulfonated polyethylene rubber (CSM), and the like.

In addition, as the silicone oil, polysiloxane oil etc. are suitable, and in particular, the viscosity shown by the chemical formula below is 5.
Polydimersiloxane oils of 0 to 500 c/s are preferred.

Cl1z CHs CLl
1 1 Cllz-5i-(-0-5i-), -0-5i-
Chz. ,,l, Cll'ilh In the present invention, the amount of silicone oil added is 0°1-1
The reason why it is set at 0% by weight is that, as is clear from the test results described below, if it is less than 0.1% by weight, sufficient low friction properties cannot be obtained, and if it is more than 10% by weight, the transmission performance and mechanical strength will deteriorate. This is because it is inconvenient as it causes a drop.

〔Example〕

Next, embodiments of the invention will be described.

Example 1 As the elastomer, urethane (trade name "Aziprene L-100J" manufactured by DuPont) was used, and as the silicone oil, polysiloxane oil (trade name "rS" manufactured by Toray Silicone Co., Ltd.) was used.
H-200J, viscosity 100c/s), the following formulation ■
The plow molding material was adjusted based on the following.

Adiprene L - 100 100 parts by weight Polysiloxane oil 0-10 parts by weight 3.
3'-dichloro-4,4'-diaminodiphenylmethane 13 parts by weight When preparing the molding material, first, adiprene L-100 was heated to 90°C, and then polysiloxane oil and crosslinking agent 3, 3"-dichloro-4°4°-diaminodiphenylmethane was mixed, and this mixture was poured into a preheated friction wheel mold or baked and adhered to the core.

The molded friction wheel is a friction wheel A whose contact surface is the disc surface.
As shown in FIG. 1, this is a body baked onto the surface of a metal base 1, with an effective diameter of 125111 mm and an elastomer layer thickness 11 of 311 mm.

On the other hand, regarding the friction wheel 8 whose contact surface is around the disc, the second
As shown in the figure, it is a cast-molded ring body that can be fitted onto the outer periphery of the support wheel 2, with an outer diameter of 99 mm, an inner diameter of 75 mm, and a contact surface. The width S is 7 yen.

In the above Example 1, friction wheels A and B were formed by changing the amount of polysiloxane oil added from 0 to 10% by weight.
When running tests were conducted on each type, the test results shown in Figure 3 were obtained.

That is, in FIG. 3, polysiloxane oil is added to 0.
It was found that while the friction coefficient and degree of friction decreased sharply when 1% by weight was added, the decrease in tensile strength and transmission performance was not so significant, and this trend continued up to approximately 6% by weight. .

Furthermore, if the amount added exceeds 6% by weight and is about 10% by weight, the improvement of the friction coefficient and degree of friction is almost at its limit.
In particular, it has been found that the addition amount is preferably within the range of 0.1 to 10% by weight, preferably 0.1 to 8% by weight, since the decrease in tensile strength is particularly significant.

Example 2 Next, friction wheels A and B shown in FIGS. 1 and 2 were molded by baking or casting using chloroprene rubber as an elastomer and the following formulation.

Carbon 64 The hardness of friction wheel B obtained from the above formulation was 90°.

Example 3 The same material as in Example 1 was used as the elastomer, and
Friction wheels A and B shown in FIGS. 1 and 2 were molded by keeping the amount of polysiloxane oil added at 3.8% by weight. The hardness of the friction wheel B obtained at this time was 88''.

Example 4 Friction wheels A and B were molded using the same compounded materials as in Example 3, and friction wheel B had a hardness of 91″'.

The friction wheels obtained in Examples 2 to 4 above were subjected to a 20-hour running test under the test conditions shown in Table 2 using the test device shown in Figure 4 with the friction wheel ^ on the drive side, and the results are shown in the right column of the table. I got it.

In addition, in the above test device, the slip angle θ of friction wheel B with respect to friction wheel A has a range of 10% depending on the contact position.
It was ~206.

Table 2 [Effects] As explained above, in this invention, the surface friction coefficient of a friction wheel made of elastomer as a molding material can be adjusted by adding silicone oil, so that the hardness and elastic modulus of the elastomer can be changed. It becomes possible to adjust the friction coefficient of the contact surface without increasing the contact pressure, and it is possible to create a friction wheel that can transmit data while preventing heat generation due to friction, etc., without increasing the contact pressure.

[Brief explanation of drawings]

1 and 2 are explanatory cross-sectional views showing the friction wheel of the present invention, and FIG. 3 is a graph showing the friction test results of the present invention.
FIG. 4 is a diagram of the test apparatus.

Claims (2)

[Claims] (1) A friction wheel formed from a mixture obtained by adding and mixing 0.1 to 10% by weight of the silicone oil to an elastomer having an affinity for silicone oil. (2) The friction wheel according to claim 1, wherein the elastomer is one selected from urethane rubber, natural rubber, styrene-butadiene rubber, butyl rubber, chloroprene rubber, acrylonitrile-butadiene rubber, and chlorosulfonated polyethylene rubber.