JPS6110167A - Fiber reinforced plastics pulley - Google Patents

Abstract

PURPOSE:To provide a plastics pulley which is light and excellent in mechanical property by using reinforcing fiber of single fiber for a tooth form portion, and reinforcing fiber of woven fiber for a disc portion. CONSTITUTION:A plastics pulley comprises a tooth form portion 10 and a disc portion 11, wherein a single fiber 9 having a fiber length of 1/4-4 inch oriented at random is used for reinforcing fiber of the tooth form portion, and a woven fiber 8 in which two axes of fibers meet at right angles is used as reinforcing fiber of the disc portion. Thus, it is possible to provide a fiber reinforced plastics pulley which is light and excellent in mechanical property and mass-production efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fiber-reinforced plastic pulley that is lightweight and can be mass-produced.

(Prior art) The metal gears that have been used in the past have had the problem of producing noise and vibration during driving due to wear due to long-term use, so recently there has been a problem with the use of metal gears. -Made of L-fiber reinforced glass to prevent noise.

It came to be used in various industrial equipment from the viewpoint of weight reduction.

However, this fiber-reinforced plastic pulley is made of continuous fibers such as carbon fibers, glass fibers, and Kevlar fibers, and thermosetting resins such as epoxy, phenol, polyester, and polyimide resins, or polysulfone.

Gear cutting and drilling processing of a disc-shaped molded product made by combining and curing thermoplastic resin such as poly c-tylsulfone resin 9
Because the continuous fibers are cut during cutting, the reinforcing effect of the reinforcing fibers cannot be fully expected and there is a risk of reducing the tooth surface strength. This is a manufacturing method that is not suitable for mass production because it is time consuming and causes severe damage to the cutting jig. Furthermore, during machining, cracks such as chipping and peeling occur due to the anisotropy of strength and modulus of elasticity, resulting in a significant deterioration of the mechanical properties of the pulley. On the other hand, as a method of manufacturing a pulley that does not require machining such as gear cutting and does not have the above drawbacks, a molding material made of continuous fibers impregnated with resin is molded along the tooth surface using a preforming mold having a tooth shape. There is a method in which a preformed body in which a tooth-shaped shape is formed by lamination is produced, and this is hardened in a mold to form a fiber-reinforced plastic pulley. However, with this method, the density of the reinforcing fibers in the tooth profile is lower than in other parts, making it impossible to manufacture a fiber-reinforced plastic pulley with uniform characteristics.

(Object of the Invention) The object of the present invention is to eliminate the drawbacks of these conventional techniques and to provide a pulley made of fiber-reinforced plastic that is light in weight and has excellent mechanical properties and bean production. This invention relates to a fiber-reinforced plastic gooley in which the reinforcing fibers are short fibers and the reinforcing fibers of one disc part are woven fabrics.

FIG. 1 shows a partially cutaway view of an embodiment of a fiber-reinforced plastic pulley according to the present invention.

In the figure, 10 is a tooth-shaped portion, and 11 is a disk portion.

Examples of reinforcing fibers used in the present invention include glass fibers, carbon fibers, silicon carbide fibers, 6-aromatic polyamide fibers, and boron fibers, and these fibers may be used alone or in combination of two or more.

In the present invention, randomly oriented short fibers are used for the toothed portion, but the fibers are long.

A range of 1/4 to 4 inches is preferred. If the fiber is thicker than 4 inches per part, the reinforcing effect of the fiber tends to be reduced, and if it exceeds 4 inches, the fibers tend to be oriented in dark blue when molded with a mold, or the molded product becomes soft and fluid. mechanical properties tend to be non-uniform.

By using short fibers as reinforcing fibers in the toothed portion, the short fibers are randomly oriented and the toothed portion is uniformly reinforced.

The toothed part t is reinforced with short fibers, but it is not necessarily necessary to reinforce all of it with short fibers, and a part of it may be reinforced with the woven fabric used to reinforce the disc part.

A woven fabric is used as the reinforcing fibers of the disk, and a woven fabric in which the fiber directions are arranged perpendicular to two axes is preferable.

The resin compositions used in ZOLLY are particularly limited to heat (-1 resin compositions or polysulfone resins such as Evogishi resin compositions, unsaturated polynisder resin compositions, polyimide resin compositions, etc.).

Thermoplastic resin compositions such as polyether sulfone resins may be used.

The fiber-reinforced plastic pulley of the present invention is produced by impregnating short fibers or woven fabric with a resin composition.

This is then molded in a mold. There are no particular restrictions on the conditions, except that the staple fibers are placed in the toothed portion or the woven fabric is placed in one disk portion in the mold.

(Example) An example will be explained. Parts are by weight.

Example epoxy resin (trade name: Ebiko manufactured by Shell Chemical Co., Ltd.)
82B) 100 parts of curing agent (product name: BF3 manufactured by Hashimoto Kasei)
・400) 3 parts of the composition was uniformly mixed in a width of 1100a.
+ m, 400 g/m' on polypropylene film (Toray No. 40 Type 2505 manufactured by Toshi Co., Ltd.)
After coating with a roll coater, a 1000m wide carbon fiber woven cloth, Torayka 6341 (product name manufactured by Toshi Co., Ltd.), was laminated on top of this, and then the same polypropylene film was laminated on top of it, and a sand-inch coating was applied. It was rolled up into a shape and aged in a heating oven at 80°C for 48 hours to obtain a woven fabric prepreg.

``Boo of Situation'' - God Carbon roving on the same polypropylene film coated with the same epoxy resin composition in the same manner as YL of the above woven fabric prepreg: Trading card T
Short fibers of -30OA (manufactured by Toshi Co., Ltd.) cut into 1-inch pieces are uniformly spread on 119 cloth, and the same polypropylene film is laminated on top of it, made into a sandwich shape, wound into a roll, and heated to 48°C at 80°C. It was aged in a heating oven for hours to obtain short fiber Silipreg.

Next, the polypropytone film was peeled off from both sides of the woven fabric Gripreg described in Section 2 and cut into a width of 100+nm, and cuts 50IIIm in length were placed on one side at VC intervals of 50mm. After wrapping each of the tapes around the upper F insert 1.2 of the molding die shown in the figure 12 times, the upper and lower inserts were combined. Further, around the outer periphery of this combined insert, the polypropylene L/N film on both sides was separated, and short fiber prepreg cut into a width of 100 square meters was wrapped five times to form a preformed body having the laminated structure shown in Fig. 2. was created.

In FIG. 2, 4 is a woven fabric prepreg wrapped around the upper insert, 5 is a woven fabric prepreg wrapped around the lower insert, and 6 is a staple fiber prepreg.

Next, as shown in Fig. 3, after attaching the lower insert 2f to the lower mold 3, the nine-divided tooth mold 7 was loaded in the circumferential direction of the preform, the mold was tightened, and the mold was heated at 150°C for 3 hours. , 3
A fiber-reinforced zolastink gooley was produced by heat-pressing molding at 0 kg f 7 cm''.

The fiber-reinforced plastic pulley obtained in the example had a structure in which the toothed portion was reinforced with short fibers and one disc portion was reinforced with woven fabric, as shown in the partially cutaway view of FIG. A fiber-reinforced plastic pulley that does not require machining such as gear cutting, has a uniform fiber content in the disk portion and the toothed portion, has sufficient strength against loads, is lightweight, and is excellent in mass production.

(Effects of the Invention) According to the present invention, it is possible to obtain a fiber-reinforced plastic gooley that is lightweight and has excellent mechanical properties and mass productivity.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway view of a fiber-reinforced plastic pulley according to an embodiment of the present invention, Fig. 2 is a sectional view of a preform obtained in the embodiment, and Fig. 3 is a molding method performed in the embodiment. It's an explanatory diagram. Explanation of symbols 1... Upper insert 2... Lower insert 3... Lower mold 4... Woven fabric prepreg 5
...Woven fabric prepreg 6...Short fiber prepreg 7
...Tooth pattern 8...Woven fabric layer 9...Short fiber layer

Claims (1)

[Claims] A fiber-reinforced plastic pulley consisting of a toothed part and a disc part, in which the reinforcing fibers in the toothed part are short fibers, and the reinforcing fibers in the disc part are woven fabric.