JPS59126158A - Gear made of fiber reinforced synthetic resin - Google Patents

Abstract

PURPOSE:To prevent gears from breakage on the tooth top and circumferential cracks near the boss by arranging radially one-way filament-like reinforcing fibers about the axis of the gear while attaching fixedly reinforcing members to both or one side of the teeth. CONSTITUTION:Teeth 2 made of fiber reinforced synthetic resin are formed integral with a metal boss 1 on the outer peripheral surface thereof. Reinforcing fibers 3 for reinforcing the synthetic resin teeth 2 consist of one-way filament- like ones of carbon fibers, glass fibers, etc. radially arranged in the synthetic resin of the teeth 2 about the axis of gear. Also, a reinforcing member 4a is fixedly attached to one or both sides of the teeth 2 for reinforcing circumferentially the synthetic resin. Thus, when a large load is applied to the gear, reinforcing fibers 3 strengthen the tooth surface against the surface pressure on the engaging contact portion of the tooth surfaces, while the reinforcing plate 4a strengthens circumferentially the teeth against the circumferential component of load acting on the engaging contact portion in the engagement of gears. As a result, cracks produced near the boss are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear made of fiber-reinforced synthetic resin.

Generally, it is well known to convert metal gears to synthetic resin gears, such as laminated beta or nylon resin, for the purpose of reducing the weight of metal gears to prevent acid parts, lube-free, and increase the number of gears.

However, simply changing the material of the gear from metal to synthetic resin may not be applicable depending on the location and purpose of the gear. That is, when the load acting on the gear is large and the gear rotates at a relatively high speed, for example, the gear is used as a pinion attached to the rotating shaft of a loom as shown in FIG.

In the case of this loom, the reduction ratio of the gears that mesh with each other is approximately 1.
:5 (motor rotation axis 1450 rpm to main shaft 29
Since the speed is reduced to 0 rpm), a large load is applied to the pinion, so a simple synthetic resin gear lacks strength and the meshing portion of the gear is destroyed. Therefore, in order to increase the strength of the synthetic resin, metal rings have been embedded in the synthetic resin of the outer periphery of the boss and the web of synthetic resin gears (
No. 56-80651) or a composite material formed by alternately laminating silicone carbide cloth fibers and carbon cloth fibers as synthetic resins with a binder made of thermosetting resin interposed therebetween. No. 8786/1983) has been proposed.

However, in the case of embedded metal rings, the synthetic W resin is reinforced by the metal ring and is sufficiently effective in preventing cracks caused by loads in the circumferential direction near the gear boss, but the meshing teeth of the gear When the load acting on the surface is large, there is a drawback that the tooth tips are damaged.

On the other hand, in the case of synthetic resin gears reinforced with silicone carbide cross fibers and carbon cross fibers, although they have remarkable effects on heat resistance and antistatic properties, the reinforcement am has an effect on the gears in terms of strength. However, they were not sufficiently effective against such loads, and had drawbacks such as loss of tooth tips and the need to increase the content of these reinforcing fibers.

Therefore, the present invention aims to solve the above-mentioned drawbacks, and its purpose is to prevent the tooth tips from chipping and to maintain the peaks even under conditions where the load acting on the tooth surface of the gear is large. It is an object of the present invention to provide a gear made of fiber-reinforced synthetic resin that can prevent the occurrence of cracks in the circumferential direction near the boss where the parts are fixed. The fibers are arranged radially in the radial direction with respect to the axis, and a reinforcing member is fixed to both sides or one side of the tooth portion to strengthen the synthetic resin in the circumferential direction. It is.

Next, a gear made of fiber-reinforced synthetic resin according to the present invention will be explained with reference to the drawings. In FIGS. 2 and 3, reference numeral 1 denotes a metal boss portion, and the outer peripheral surface of the boss portion is made of fiber-reinforced synthetic resin. The tooth portion 2 is integrally formed. 8 is a reinforcing fiber for reinforcing the synthetic resin of the tooth portion 2, and the fiber may be carbon fiber, glass fiber, or organic fiber (for example, trade name: KEG').
sm machine fibers (alumina fiber, poron fiber, silicon carbide fiber, etc.), etc., while matrix materials include thermosetting resins such as epoxy resins, phenolic resins, urea resins, melamine resins, unsaturated polyester resins, etc., and thermoplastic resins. As the resin, ηmiland resin, polyester resin, polyimide resin, polyolefin resin, etc. can be used. Further, these reinforcing fibers 8 are made of unidirectional filament fibers, and are arranged radially in the synthetic resin of the tooth portion 2 in the radial direction with respect to the axis.

Note that the content of the reinforcing fiber R8 may be appropriately selected depending on the requirements for gear strength.

Furthermore, reinforcing members 4 are fixed to both or one side of the tooth portion 2 to strengthen the synthetic resin in the circumferential direction. That is, FIGS. 4 and 5 show that the reinforcing member 4a is made of metal, for example, a thin plate-shaped body, and this plate-shaped body is fixed to both fil1 surfaces of the tooth portion 2. 6th
7 and 7 show another example of the reinforcing member 4. In this case, the reinforcing member 4a is a synthetic resin laminate in which filament-like reinforcing fibers 8 are arranged in one direction in the circumferential direction of the tooth portion 2. The example shown in FIG. 6 is one in which a single filament-like reinforcing fiber 3 is continuously wound spirally.

On the other hand, in FIG. 7, the filament-like reinforcing fibers 8 are rings, which are arranged concentrically.

FIG. 8 shows another example of the reinforcing member 4. In this case, the reinforcing member 4 is made by laminating reinforcing fibers 3 arranged in parallel so as to cross each other, and in addition to this, the reinforcing fibers 3 are made of fabric. The face is 111 in the shape of a net! ! It is a plate-like material made of a woven net.

9 and 10 show an example of a ring concentric with the reinforcing member 4b or the boss portion 1. Even if this ring is made of metal, it has a filament shape continuous in one direction in the circumferential direction. It may also be a fiber-reinforced synthetic resin reinforced with reinforcing fibers. Furthermore, the filament-like reinforcing fiber may be a single filament fiber wound continuously in a spiral shape, or may be made by concentrically arranging a plurality of rings with different diameters depending on the strength requirements of the gear. It's okay.

Invent this invention! 11! The fiber-reinforced synthetic resin gear to be applied is constructed as described above, and its function will be described next.For example, in FIG. When in use, when a large load is applied to the gear, one-way filament-like reinforcement arranged radially in the synthetic resin of the tooth part 2 can withstand the surface pressure at the meshing contact area of the tooth surface. Fiber 3 plays the role of reinforcing the south side and exhibits a great deal of resistance.

On the other hand, in response to the circumferential component of the load that acts on the meshing contact area when the gears mesh, the reinforcing plate 4 does not have the role of reinforcing the tooth area in the circumferential direction. The occurrence of this is prevented.

As described above, the material of the tooth portion integrally formed with the boss portion is made of a fiber-reinforced synthetic resin in which unidirectional filament-like reinforcing fibers are arranged radially in the radial direction with respect to the axis. Since reinforcing members are attached to both sides or one side of the tooth portion to prevent cranking in the radial direction, the tooth surface and the circumferential direction are much improved compared to conventional synthetic resin gears. It is reinforced and can withstand large loads, and if the reinforcing member is made of metal, the pawl holder of the gear removal tool becomes a part when the pinion is replaced frequently.

While this can prevent damage to the gear due to the tool claw, if the reinforcing member is made of fiber-reinforced resin, the weight of the gear will be lighter, and 1111! When manufacturing, it has the effect of being extremely easy to manufacture by integral molding.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of the loom drive source section, Fig. 2 is a front view of the main parts including a partially cut arrow part showing an example of the fiber-reinforced synthetic resin float of the present invention, and Fig. 3 is the same as Fig. 2. FIG. 4 is a front view showing an example of a fiber-reinforced synthetic resin gear according to the present invention, FIG. 5 is a side sectional view of FIG. 4, and FIGS. Explanatory diagram showing an example of a reinforcing member that strengthens the circumferential direction%
Figure 8 shows the circumferential direction of the gear of the present invention! Figure 9 is a front view showing another example of the reinforcing synthetic resin gear of the present invention.
FIG. 10 shows a side sectional view of FIG. 9. 1 ... Boss part 2 ... Teeth part 3 ... Reinforcement fiber R4 ... Reinforcement member 4
a...Plate-shaped body 4b...Ring Applicant Representative Ishikawa Seisakusho Co., Ltd. Shigeru Nohara Z diagram Mine 3 Kanmine + Zu Kaishichi Entai 6 diagram $7 Figure δ diagram

Claims (1)

[Claims] 1. In a gear consisting of a metal boss and a pair of teeth made of fiber-reinforced synthetic + M fat-hard teeth formed on the boss, N
11. The rod set reinforced with synthetic resin has a unidirectional filament shape, is arranged radially in the radial direction with respect to the III core, and has synthetic resin parts on both sides or one side of the part. A gear made of fiber-reinforced synthetic resin, characterized in that it is constructed by fixing an r reinforcing member for reinforcing the circumferential direction of the gear. 2. The fiber-reinforced synthetic resin gear according to claim 1, wherein the reinforcement S is made of a thin metal plate. 3. The fiber-reinforced resin gear according to claim 111, wherein the reinforcing member is a synthetic resin plate-like body made of a laminated plate in which filament-like reinforcing fibers are arranged in one direction in the circumferential direction. 4. The i-fiber reinforced resin 111 according to claim 1, wherein the reinforcing member is a synthetic resin plate-like body formed by laminating filament-shaped reinforcing fibers arranged in parallel so as to cross each other.
1! gear. 5. The fiber-reinforced resin gear according to claim 1, wherein the reinforcing member is a synthetic resin plate-like body made of reinforced m-fibers woven into a cloth or net shape. 6. The fiber-reinforced resin gear 7 according to claim 1, wherein the reinforcing member is a ring concentric with the ponu portion; The fiber-reinforced resin gear according to claim 6, wherein the ring is made of metal. . 8. The fiber-reinforced resin gear according to claim 6, wherein the ring is made of fiber-reinforced synthetic resin reinforced with filament-like reinforcing fibers continuous in the circumferential direction.