JP2850722B2 - Phenolic resin gear and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phenolic resin gear using an aramid nonwoven fabric obtained by mixing and compounding a meta-aromatic polyamide fiber and a para-aromatic polyamide fiber as a reinforcing base material for a tooth part structure and its production. About the law.

[0002]

2. Description of the Related Art Resin gears are widely used with many advantages such as low engagement noise, excellent wear resistance, light weight and low rotational inertia. The resin gear is filled with an organic or inorganic reinforcing material in the resin to increase the load bearing capacity. These are granular materials, monofilaments and woven fabric substrates. For example, when glass resin is filled in the resin constituting the tooth portion, strength and heat resistance can be improved. However, in this case, the tooth surface of the mating gear to be meshed is liable to be remarkably worn, so that it is not suitable for applications in which a large tooth surface load must be borne. Therefore, conventionally, a cotton cloth or a meta-based aromatic polyamide woven cloth has been frequently used as a reinforcing base material. Gears made by impregnating cotton cloth or meta-based aromatic polyamide woven fabric with phenolic resin, and applying heat cutting under pressure to gears have excellent abrasion resistance and have the necessary performance as gears on average. I have.

[0003]

However, a phenolic resin gear having a tooth portion made of a cotton cloth or a meta-aromatic polyamide woven fabric as a reinforcing base material is required to have a higher strength. It is difficult due to the characteristics of the polyamide woven fabric itself. When used in a lubricating oil at a high temperature of 100 to 130 ° C., such as a timing gear for an automobile engine, the durability is insufficient. On the other hand, a phenol resin gear in which the teeth are formed using a para-aromatic polyamide woven fabric as a reinforcing material can obtain high strength, but is not desirable because of poor workability. The problem to be solved by the present invention is
An object of the present invention is to provide a phenol resin gear excellent in workability at the time of manufacture and durability at high temperatures by selecting a reinforcing base material of a tooth part structure.

[0004]

In order to solve the above-mentioned problems, a phenolic resin gear according to the present invention is characterized in that the reinforcing base material of the tooth portion is composed of 30 to 95% by weight of a meta-based aromatic polyamide fiber and para-based. It is an aramid nonwoven fabric in which 70 to 5% by weight of an aromatic polyamide fiber is mixed and compounded.
The nonwoven fabric is, for example, a nonwoven fabric obtained by mixing para- and meta-raw cotton cut into a length of 51 mm, dissociating, dispersing, laminating, and needle-forming. In addition, the method for producing a phenolic resin gear according to the present invention is basically based on Japanese Patent Publication No. 46-29683.
According to the method disclosed in Japanese Patent Application Laid-Open Publication No. H10-209, the following steps (1) to (5) are performed. (1) A step of impregnating and drying a phenolic resin in an aramid nonwoven fabric in which 30 to 95% by weight of a meta-aromatic polyamide fiber and 70 to 5% by weight of a para-aromatic polyamide fiber are mixed and composited (2) Impregnation and drying of the resin (3) a step of cutting the cut aramid nonwoven fabric into a predetermined shape, winding the cut aramid nonwoven fabric from an edge while heating, forming a rod-like shape, and further rounding it into a ring-shaped tooth structure (4) the ring shape (5) A molding product having undergone the above-described process, in which the tooth structure is loaded into a mold, and a molding material and a bush for forming a gear web and a boss are arranged inside the tooth structure to form a heat and pressure. Forming teeth by machining on the tooth part constituting part

[0005]

The nonwoven fabric of para-aromatic polyamide is a substrate having extremely high strength as compared with cotton, but generally has poor workability. The meta-based aromatic polyamide nonwoven fabric is inferior in strength to the para-based non-woven fabric, but is excellent in workability by that much. Therefore, by using an aramid nonwoven fabric that is a mixture and composite of a meta-based aromatic polyamide fiber and a para-based aromatic polyamide fiber, the ratio of the meta-based aromatic polyamide fiber and the para-based aromatic polyamide fiber is set as described above. Thereby, a phenol resin gear excellent in balance between workability and strength can be obtained. In the present invention, a non-woven fabric is used instead of a woven fabric, but the non-woven fabric is superior in terms of workability of the woven fabric and the non-woven fabric. Further, the nonwoven fabric is more excellent in resin impregnating property than the woven fabric, and is less likely to vary in strength depending on the direction of the base material such as a woven fabric.

[0006]

【Example】

Example 1 Raw cotton of polymetaphenylene isophthalamide fiber ("CONEX" manufactured by Teijin, fiber diameter: 2 de, fiber length 51 mm)
And raw cotton of polyparaphenylene terephthalamide fiber (“Technola type T330” manufactured by Teijin, fiber diameter 1.5d
e, a fiber length of 51 mm) was mixed and composited at a weight ratio of 95/5, and a phenol resin was impregnated and dried with a resin amount of 57% by weight into a prepreg 1 (unit weight: 130 g / m ² ).
The prepreg 1 was cut into a predetermined shape, heated and softened on a hot plate, rolled into a rod shape, and then rolled into a band-shaped tooth structure 2 as shown in FIG. Further, as shown in FIG. 2, a phenol resin-impregnated meta-aromatic polyamide woven fabric substrate and a phenol resin-impregnated cotton fabric substrate were cut into 5 mm square, and a phenol resin impregnated glass woven fabric substrate was cut into 10 mm square. Thus, a molding material as the chip piece 3 was prepared. This molding material is put into the temporary molding die 4 10
At 0 ° C., an annular web structure 5 was temporarily formed. Next, as shown in FIG. 3, a metal bush 7 is arranged at the center of the mold 6, and the above annular web structure 5 is surrounded therearound.
The tooth structure 2 was arranged on the outermost periphery, and heated and pressed at 180 ° C. to integrate the three members. After molding, the teeth were formed by mechanical cutting on the tooth component structure to obtain a resin gear. The characteristics are shown in Table 1.

Example 2 In Example 1, the mixing ratio of polymetaphenylene isophthalamide fiber and polyparaphenylene terephthalamide fiber was 80/20 by weight. Hereinafter, a resin gear was formed in the same manner as in Example 1. The characteristics are shown in Table 1.

Example 3 In Example 1, the mixing ratio of polymetaphenylene isophthalamide fiber and polyparaphenylene terephthalamide fiber was 70/30 by weight. Hereinafter, a resin gear was formed in the same manner as in Example 1. The characteristics are shown in Table 1.

Example 4 In Example 1, the mixing ratio of polymetaphenylene isophthalamide fiber and polyparaphenylene terephthalamide fiber was 50/50 by weight. Hereinafter, a resin gear was formed in the same manner as in Example 1. The characteristics are shown in Table 1.

Example 5 In Example 1, the mixing ratio of the polymetaphenylene isophthalamide fiber and the polyparaphenylene terephthalamide fiber was 30/70 by weight. Hereinafter, a resin gear was formed in the same manner as in Example 1. The characteristics are shown in Table 1.

Comparative Example 1 In Example 1, the mixing ratio of polymetaphenylene isophthalamide fiber and polyparaphenylene terephthalamide fiber was 10/90 by weight. Hereinafter, a resin gear was formed in the same manner as in Example 1. The characteristics are shown in Table 1.

Comparative Example 2 Raw cotton of polymetaphenylene isophthalamide fiber (“CONEX” manufactured by Teijin, fiber diameter: 2 de, fiber length 51 mm)
And raw cotton of polyparaphenylene terephthalamide fiber (“Technola type T330” manufactured by Teijin, fiber diameter 1.5d
e, a fiber length of 51 mm) was mixed and spun at a weight ratio of 50/50, and the woven fabric was impregnated with a phenol resin at a resin amount of 57% by weight and dried to obtain a prepreg 1. The above prepreg 1
Was used for the tooth part constituting body 2 to obtain a resin gear in the same manner as in Example 1. The characteristics are shown in Table 1.

Conventional example Woven fabric (filament diameter: 2 de) made of raw cotton of polymetaphenylene isophthalamide fiber ("Conex" manufactured by Teijin Ltd., fiber diameter: 2de), number of threads per inch: 57 per inch, horizontal 57) phenolic resin amount 57
The prepreg 1 was impregnated and dried at a weight percentage of 1%. The above-mentioned prepreg 1 was used for the tooth part constituting body 2, and thereafter, a resin gear was formed in the same manner as in Example 1. The characteristics are shown in Table 1.

In Table 1, the mounting endurance time is shown in Examples,
The resin gears of the conventional example and the comparative example were subjected to a cam gear acceleration test of an automobile engine (rotation speed: 3000 rpm, oil temperature at which the resin gear was immersed at 130 ° C., tooth root load stress 18 kg / mm ² ), and the durability time was measured. The gear cutting workability was confirmed by visually checking the processing state of the teeth during the gear cutting of each resin gear.

[0015]

[Table 1]

[0016]

As described above, in the phenolic resin gear according to the present invention, the reinforcing base material constituting the tooth portion is formed by using 30 to 95% by weight of the meta-based aromatic polyamide fiber and 70 to 5% by weight of the para-based aromatic polyamide fiber. By using an aramid nonwoven fabric in which the weight% is mixed / composited, a resin gear excellent in workability and durability at high temperatures can be obtained. When the proportion of the meta-based aromatic polyamide fiber is 50 to 80% by weight and the proportion of the para-based aromatic polyamide fiber is 50 to 20% by weight, the balance between processability and durability is further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a step of preparing a tooth component in the production of a phenol resin gear.

FIG. 2 is an explanatory view showing a step of preparing a web structure in the production of a phenolic resin gear.

FIG. 3 is an explanatory sectional view showing a state in which a phenol resin gear is molded.

[Explanation of symbols]

 1 is a prepreg 2 is a tooth component 3 is a chip piece 4 is a temporary molding die 5 is a web component 6 is a die 7 is a metal bush

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code FI B29K 277: 00 (56) References JP-A-55-41273 (JP, A) JP-A-60-206628 (JP, A) JP-A-61-167070 (JP, A) JP-A-2-241729 (JP, A) JP-A-2-252537 (JP, A) JP-A-3-89059 (JP, A) JP-A-3-70292 (Japanese) JP, U) Japanese Utility Model Hei 5-59012 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 55/06 B29D 15/00 B29C 67/14 B29K 61:04 B29K 277: 00 D04H 1/42

Claims (4)

(57) [Claims] 1. A phenolic resin gear having a tooth structure formed by heating and pressing a reinforcing base material impregnated with a phenolic resin, wherein the reinforcing base material comprises 30 to 95% by weight of a meta-aromatic polyamide fiber. A phenol resin gear, which is an aramid nonwoven fabric in which 70 to 5% by weight of a para-aromatic polyamide fiber is mixed and compounded. 2. A reinforcing base material comprising 50 to 80% by weight of a meta aromatic polyamide fiber and 50 to 80% by weight of a para aromatic polyamide fiber.
The phenolic resin gear according to claim 1, wherein the phenolic resin gear is an aramid nonwoven fabric in which 20% by weight is mixed and combined. 3. A method for producing a phenolic resin gear, comprising the following steps (1) to (5). (1) A step of impregnating and drying a phenolic resin in an aramid nonwoven fabric in which 30 to 95% by weight of a meta-aromatic polyamide fiber and 70 to 5% by weight of a para-aromatic polyamide fiber are mixed and composited (2) Impregnation and drying of the resin (3) a step of cutting the cut aramid nonwoven fabric into a predetermined shape, winding the cut aramid nonwoven fabric from an edge while heating, forming a rod-like shape, and further rounding it into a ring-shaped tooth structure (4) the ring shape (5) A molding product having undergone the above-described process, in which the tooth structure is loaded into a mold, and a molding material and a bush for forming a gear web and a boss are arranged inside the tooth structure to form a heat and pressure. Forming teeth by machining on the tooth part constituting part 4. The method according to claim 1, wherein the step (1) comprises mixing 50 to 80% by weight of the meta-aromatic polyamide fiber with the para-aromatic polyamide fiber 50.
4. A method for producing a phenolic resin gear according to claim 3, wherein the step of impregnating and drying a phenolic resin in an aramid nonwoven fabric mixed and compounded with -20% by weight.