JPH0645200B2 - Resin pulley - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pulley (pulley having a tooth, a V pulley) suitable for an engine part of an automobile or the like.

2. Description of the Related Art As automobile parts are becoming smaller, lighter, and lower in cost, pulleys such as toothed pulleys and V-pulleys are becoming an important issue in shifting from metal to resin. These pulleys are required not to wear the belt and have good heat resistance and dimensional stability.

Conventional resin pulleys are molded of phenolic resin, and main fillers include those containing glass fibers and calcium carbonate, those containing cotton cloth sections, and those containing wood powder.

However, in the above description, calcium carbonate having a low hardness is destroyed on the surface of the pulley, and fluffing of glass fibers appears, which causes the belt to wear. Further, in and, although it is good that the belt is not worn, there is a problem that the wear resistance, dimensional stability, and heat resistance of the pulley itself are poor.

The present invention solves the advantages and disadvantages of the conventional technique based on the type of filler, suppresses belt wear, and provides a resin pulley having improved wear resistance, dimensional stability, and heat resistance of the pulley itself. To aim.

Means for Solving the Problems In order to achieve the above object, the present invention, in a pulley molded with a phenol resin, as a main filler, glass fiber, and the following groups, namely glass beads, silica powder, aluminum-silica powder, It is characterized in that it contains one selected from the group of glass powders.

Action The pulley according to the present invention maintains high dimensional stability by blending glass fiber having excellent mechanical strength, and since it incorporates an inorganic filler as a main filler, it has good heat resistance. keeping. Each of the fillers belonging to the above group has high hardness and imparts excellent wear resistance to the pulley. Furthermore, the blending of the granular filler having high hardness contributes to preventing the belt from being worn unexpectedly.

Examples Phenolic resins used in the present invention are novolac resins,
Any of phenolic resins may be used, and hexamine can be applied as a curing agent. In addition to the above-mentioned filler, if necessary, a reinforcing material, a coloring material, a release agent, a curing accelerator, etc. are blended, and the molding material obtained by mixing, kneading and pulverizing using a roll or the like is subjected to compression molding or transfer molding. Alternatively, injection molding is performed to obtain a resin pulley. The pulley usually has a metal insert in the center.

Hereinafter, examples will be described in detail together with comparative examples.

Examples 1 to 3 and Comparative Examples 1 to 2 Mixtures having the compositions shown in Table 1 were mixed by rolls, kneaded and then pulverized to obtain molding materials. This molding material was injection molded (50 molding machine) to obtain a pulley. Molding conditions are a mold temperature of 180 ° C and a cylinder temperature (front 90 ° C, rear 50 ° C).

The characteristics of the pulley are also shown in Table 1. The abrasion resistance of the pulley and the abrasion resistance of the belt are as follows. The state of wear of the pulley and the belt was visually evaluated.
Further, the heat resistance and dimensional stability of the pulley were evaluated in the deteriorated state of the pulley after the abrasion test.

Examples 4 to 6 Molding materials were similarly obtained from the formulations having the compositions shown in Table 2, and pulleys were similarly molded. The characteristics of the pulley are also shown in Table 2. The method of testing the characteristics is also the same.

Examples 7 to 9 Pulleys were obtained in the same manner using the compositions having the compositions shown in Table 3,
The characteristics are also shown in Table 3.

Examples 10-12, Comparative Example 3 Pulleys were obtained in the same manner using the formulations having the compositions shown in Table 4,
Its characteristics are also shown in Table 4. EFFECTS OF THE INVENTION As described above, the pulley made of the phenol resin according to the present invention contains the glass fiber as the main filler and the granular inorganic filler having high hardness, thereby suppressing the wear of the belt and the pulley itself. The abrasion resistance, heat resistance, and dimensional stability of the product have been improved, and its industrial value is extremely large.

Claims (4)

[Claims] 1. A resin pulley formed of a phenol resin and containing glass fibers and glass beads as main fillers. 2. A resin pulley formed of a phenol resin and containing glass fiber and silica powder as main fillers. 3. A resin pulley formed of a phenol resin and containing glass fiber and aluminum-silica powder as main fillers. 4. A resin pulley formed of a phenol resin and containing glass fiber and glass powder as main fillers.