JP7035566B2 - Resin gears - Google Patents

Description

The present invention relates to resin gears.

Resin gears are lightweight and have excellent quietness, and are widely used, for example, as gears for vehicles or industrial use. The resin gear includes an annular metal bush, an annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and an elastic member provided between the metal bush and the resin member. , And resin gears are known (see, for example, Patent Document 1). In the resin gear as described above, the impact generated by meshing with other gears is absorbed by the elastic deformation of the elastic member, so that even if a strong load is temporarily applied to the resin gear, the impact can be absorbed. The occurrence of damage can be suppressed.

Japanese Unexamined Patent Publication No. 2017-151000

It is preferable that fluororubber is used for the elastic member of the resin gear as described above in consideration of strength, oil resistance, heat resistance and the like. However, in general, it is difficult for fluororubber to be firmly bonded to the metal bush when integrally molded with the metal bush. Therefore, before the elastic member exerts the desired damping function, the bond between the metal bush and the elastic member may be broken and the resin gear may be damaged.

Therefore, an object of the present invention is to provide a resin gear capable of obtaining a desired damping function even when fluororubber is used as an elastic member.

The resin gear of the present invention is provided between an annular metal bush, an annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and the metal bush and the resin member. An annular elastic member is provided, and the elastic member includes a first layer provided on the interface side with the metal bush in the radial direction and a second layer provided on the outside of the first layer in the radial direction. The second layer is made of fluororubber, and the first layer is made of nitrile rubber, acrylic rubber or natural rubber.

The resin gear having this configuration is an elastic member having a first layer made of nitrile rubber, acrylic rubber or natural rubber, which is arranged at an interface with a metal bush in addition to a second layer made of fluororubber. Is provided between the metal bush and the resin member. As a result, the annular metal bush is in contact with the first layer formed of nitrile rubber, acrylic rubber or natural rubber, which has lower non-contact and slipperiness than fluororubber and has excellent adhesion to metal. Since it is bonded to the elastic member at the same time, the bonding force between the elastic member and the metal bush can be increased as compared with the case where the elastic member made of a single fluororubber and the metal bush are bonded. Further, as compared with the case where a layer formed of nitrile rubber, acrylic rubber or a single natural rubber is provided between the metal bush and the resin member, chemical resistance, heat resistance and the like can be improved. As a result, even when fluororubber is used as the elastic member, a desired damping function can be obtained.

In the resin gear having this configuration, the layer thickness of the first layer may be smaller than the layer thickness of the second layer. As a result, it is possible to increase the bonding force between the elastic member and the metal bush while maintaining superiorities such as strength, oil resistance, and heat resistance.

In the resin gear of the present invention, the layer thickness of the first layer may be 0.1 mm to 20 mm. With this elastic member, the layer thickness of the first layer can be made smaller than the layer thickness of the second layer, so that the elastic member and the metal bush can be maintained while maintaining superiority in strength, oil resistance, heat resistance, and the like. It is possible to increase the binding force with.

The resin gear of the present invention further includes an annular metal member bonded to the inner peripheral surface of the resin member between the resin member and the elastic member, and the elastic member is at the interface with the metal member in the radial direction. It further has a third layer provided and provided outside the second layer in the radial direction, and the third layer may be formed of a resin material having a higher shear strength than fluororubber.

Since the resin gear having this configuration is provided with an annular metal member on the inner peripheral surface of the resin member, it can be fastened to the metal shaft by a method such as press fitting or shrink fitting. In this case, in addition to the second layer formed of fluororubber, the elastic member arranged at the interface with the annular metal member and further having the third layer formed of nitrile rubber, acrylic rubber or natural rubber is a metal. It is provided between the bush and the resin member. As a result, the annular metal material is bonded to the elastic member in contact with the third layer, so that the elastic member and the metal material can be combined with each other as compared with the case where the elastic member made of fluororubber alone and the metal material are bonded. It is possible to increase the binding force of. As a result, even when fluororubber is used as the elastic member, a desired damping function can be obtained.

In the resin gear of the present invention, the layer thickness of the third layer may be smaller than the layer thickness of the second layer. As a result, it is possible to increase the bonding force between the elastic member and the metal bush while maintaining superiorities such as strength, oil resistance, and heat resistance.

In the resin gear of the present invention, the layer thickness of the third layer may be 0.1 mm to 20 mm. With this elastic member, the layer thickness of the third layer can be made smaller than the layer thickness of the second layer, so that the elastic member and the metal bush can be maintained while maintaining superiority in strength, oil resistance, heat resistance, and the like. It is possible to increase the binding force with.

According to the present invention, it is possible to obtain a desired damping function even when fluororubber is used as the elastic member.

FIG. 1 is a plan view of a resin gear according to an embodiment. FIG. 2 is a diagram showing a cross-sectional structure taken along the line II-II in FIG. 3A to 3D are explanatory views illustrating a method for manufacturing a resin gear according to an embodiment. FIG. 4 is a plan view of the resin gear according to the modified example. FIG. 5 is a diagram showing a cross-sectional configuration taken along the line VV in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

The resin gear 1 according to one embodiment is a so-called high-strength resin gear, and is used as a gear for a vehicle or an industrial use. As shown in FIGS. 1 and 2, the resin gear 1 includes a metal bush 3, an elastic member 5, a resin member 7, an adhesive layer 9, and an adhesive layer 11. The resin gear 1 according to the present embodiment is a spur gear. In FIG. 1, the adhesive layers 9 and 11 are not shown.

The metal bush 3 is a member attached to a rotating shaft (not shown). The metal bush 3 has an annular shape. The metal bush 3 is made of a metal material, and is made of, for example, carbon steel such as carbon steel S45C for machine structure, sintered metal, or the like. The metal bush 3 is provided with a through hole 3h. The through hole 3h penetrates one side surface 3a and the other side surface 3b of the metal bush 3. A rotation shaft is inserted into the through hole 3h. The metal bush 3 has an inner peripheral surface 4a and an outer peripheral surface 4b. The inner peripheral surface 4a defines a through hole 3h. The outer peripheral surface 4b is a surface facing the elastic member 5.

The elastic member 5 is a member that attenuates the impact generated by the resin gear 1 meshing with other gears. Specifically, when excessive collision energy is applied to the resin member 7 due to the tooth profile 7b of the resin member 7 being driven, which will be described in detail later, meshing with the mating gear, the resin member 7 and the metal bush 3 are combined. The elastic member 5 arranged between them is deformed (compressive deformation or tensile deformation) to absorb the above energy. The elastic member 5 is annular. The elastic member 5 is provided around the metal bush 3. The elastic member 5 is provided between the metal bush 3 and the resin member 7.

The elastic member 5 has a first layer 5a provided at the interface with the metal bush 3 in the radial direction R, and a second layer 5b provided outside the first layer 5a in the radial direction R. The second layer 5b is made of fluororubber. The first layer 5a is made of NBR (nitrile rubber), ACM (acrylic rubber) or natural rubber. Nitrile rubber is preferable as the material used for the first layer 5a.

An example of the size (layer thickness) T1 in the radial direction R of the elastic member 5 is 1 mm to 45 mm. The layer thickness of the first layer 5a is smaller than the layer thickness of the second layer 5b. An example of the layer thickness T11 of the first layer 5a is 0.1 mm to 20 mm, and an example of the layer thickness T12 of the second layer 5b is 0.9 mm to 25 mm. The ratio of the layer thickness T11 of the first layer 5a to the layer thickness T12 of the second layer 5b is 1: 1.25 to 1: 9.

The resin member 7 is a member that meshes with other gears. The resin member 7 is annular. The resin member 7 is made of resin. The resin member 7 is provided around the elastic member 5. The resin member 7 here is provided so as to be in contact with the outer peripheral surface of the elastic member 5. A tooth profile 7b is formed on the outer peripheral portion of the resin member 7. A plurality of tooth profiles 7b are formed at predetermined intervals in the circumferential direction of the resin member 7. It should be noted that the provision around the elastic member 5 includes not only the provision in direct contact with the circumference of the elastic member 5 but also the provision around the elastic member 5 via another member.

An adhesive layer 9 formed during vulcanization adhesion is arranged between the metal bush 3 and the first layer 5a of the elastic member 5. An adhesive layer 11 formed during vulcanization adhesion is arranged between the first layer 5a of the elastic member 5 and the second layer 5b of the elastic member 5. An adhesive layer 13 formed during vulcanization adhesion is arranged between the second layer 5b of the elastic member 5 and the resin member 7.

Subsequently, a method for manufacturing the resin gear 1 will be described. The method for manufacturing the resin gear 1 includes a bushing process, a manufacturing element forming process, a resin member forming process, a cutting process, a resin member processing process, an elastic member forming process, and a gear cutting process. include.

[Bush processing process]
In the bush processing step, the outer peripheral surface 4b of the metal bush 3 is processed. Specifically, for example, the outer peripheral surface 4b of the metal bush 3 is subjected to a phosphate coating treatment to form a phosphoric acid layer on the outer peripheral surface 4b. The phosphoric acid layer can be, for example, a zinc phosphate coating (composition containing zinc). The main components of the zinc phosphate coating are hopite (Zn ₃ (PO ₄ ) _{2.4H 2} O) and phosphophyllite (Zn ₂ Fe (PO ₄ ) _{2.4H 2} O). The zinc phosphate film is treated with a treatment liquid containing phosphate ions and zinc ions as main components, and is formed by precipitating zinc. The thickness of the zinc phosphate coating is, for example, 2 μm to 3 μm. By forming the phosphoric acid layer on the outer peripheral surface 4b of the metal bush 3, unevenness is formed on the outer peripheral surface 4b. After processing the metal bush 3, the metal bush 3 is washed. Cleaning of the metal bush 3 may be performed before the adhesive application step.

[Paper machine forming process]
In the papermaking element forming step, an annular papermaking element is formed by the papermaking method. The papermaking element may contain only short fibers or may contain short fibers and a resin.

A conventionally known method can be applied to the formation of the papermaking element by the papermaking method. For example, the annular shape can be formed by using a cylindrical mold. Further, for the abstracted sol, for example, a bush is placed in the center of the mold, a dispersion liquid of staple fibers, a dispersion medium and an arbitrary resin is injected around the bush, and the dispersion medium is discharged from the mold, and then the cylinder is formed. It can be formed by compressing the aggregate remaining in the mold.

The melting point of the staple fibers or the decomposition temperature of the staple fibers is preferably 250 ° C. or higher. By using such staple fibers, the short fibers do not cause thermal deterioration at the molding temperature or processing temperature at the time of molding, and the atmospheric temperature at the time of actual use, and the fiber base material or the resin gear having excellent heat resistance can be obtained. can do.

As short fibers, para-aramid fiber, meta-aramid fiber, carbon fiber, glass fiber, boron fiber, ceramic fiber, ultra-high strength polyethylene fiber, polyketone fiber, polyparaphenylene benzobisoxazole fiber, total aromatic polyester fiber, It is preferable to use at least one type of short fiber selected from the polyimide fiber and the polyvinyl alcohol-based fiber. In particular, when a mixed fiber of a para-based aramid fiber and a meta-based aramid fiber is used as a staple fiber, the balance between heat resistance, strength, and processability after resin molding is excellent.

As the slurry, an organic solvent, a mixture of an organic solvent and water, water or the like can be used. As the slurry, it is preferable to use water, which is particularly economical and has a low environmental load. When using an organic solvent, paying sufficient attention to safety, it is also possible to use an organic solvent such as methanol, ethanol, acetone, toluene, and diethyl ether.

The resin may be either a thermosetting resin or a thermoplastic resin, but is preferably a thermosetting resin from the viewpoint of improving the strength of the resin gear to be manufactured. More specifically, epoxy resin, polyaminoamide resin, phenol resin, unsaturated polyester resin, polyimide resin, polyether sulfone resin, polyether ether ketone resin, polyamideimide resin, polyamide resin, polyester resin, polyphenylene sulfide resin, A combination of one or more resins selected from polyethylene resin, polypropylene resin and the like and a curing agent according to the type of the selected resin can be used. Among these, the polyaminoamide resin is preferable from the viewpoint of the strength and heat resistance of the cured resin, and the mixture 100 of 2,2'-(1,3 phenylene) bis2-oxazoline and the amine curing agent having excellent heat resistance and strength is 100. With respect to parts by mass, it is preferable to use, for example, a resin having n-octyl bromide of 5 parts by mass or less as a curing accelerator for the catalyst.

The resin may be made together with the short fibers in the papermaking element forming step, or may be impregnated into the papermaking element in the resin member forming step after forming the papermaking element containing only the staple fibers.

[Resin member forming process]
In the resin member forming step, the papermaking element is placed in the mold and the resin is cured to form the resin member 7. When the resin is not used in the process of forming the paper machine, the resin is injected into the mold to impregnate the paper machine and then the resin is cured.

[Cutting process]
In the cutting process, the molded product composed of the metal bush 3 and the resin member 7 is cut to adjust the dimensions of the molded product. In the cutting process, the molded product is cut by a machine tool such as a lathe. Specifically, in the cutting step, the outer diameter portion and the inner diameter portion side surface of the molded product are scraped, and the molded product is processed to a predetermined size.

[Resin member processing process]
In the resin member processing step, the inner peripheral surface 7a of the resin member 7 is processed. Specifically, for example, the inner peripheral surface 7a of the resin member 7 is subjected to shot blasting to form irregularities on the inner peripheral surface 7a. After the resin member processing step, the resin member 7 is washed. The cleaning of the resin member 7 may be performed before the adhesive application step. The resin member processing step may be omitted.

[Elastic member forming process]
In the elastic member forming step, the elastic member 5 composed of the first layer 5a and the second layer 5b is formed between the metal bush 3 and the resin member 7. As shown in FIG. 3A, the metal bush 3 is arranged in the first molding die 20A, and the adhesive A1 is applied to the outer peripheral surface 4b of the metal bush 3. The adhesive A1 is a vulcanized adhesive, and for example, Chemlock 607 (manufactured by Lord Japan Inc.) can be used.

Subsequently, as shown in FIG. 3B, the unvulcanized rubber material (nitrile rubber) G1 is pushed into the first injection section 21A by the first push-in member 22A, and the rubber material is pushed through the first injection section 21A. Inject G1. As a result, the rubber material G1 is filled on the outside of the metal bush 3. Then, the filled rubber material G1 is vulcanized, and heat and pressure are applied to the vulcanized rubber material G1. As a result, the metal bush 3 and the rubber material G1 are vulcanized and bonded, and the first layer 5a made of nitrile rubber is formed on the outside of the metal bush 3. Further, by the above-mentioned vulcanization adhesion, an adhesive layer 9 is formed between the metal bush 3 and the first layer 5a of the elastic member 5 (interface).

Subsequently, as shown in FIG. 3C, an intermediate body in which the metal bush 3 and the first layer 5a of the elastic member 5 are integrated and the resin member 7 are arranged in the second molding die 20B. The adhesive A2 is applied to the outer peripheral surface 5a of the first layer 5a, and the adhesive A3 is applied to the inner peripheral surface 7a of the resin member 7. The adhesives A2 and A3 are vulcanized adhesives like the adhesive A1, and for example, Chemlock 607 (manufactured by Lord Japan Inc.) can be used.

Subsequently, as shown in FIG. 3D, the unvulcanized rubber material (fluororubber) G2 is pushed into the second injection portion 21B by the second pushing member 22B, and the metal bush 3 and the elastic member 5 are the first. The rubber material G2 is injected between the layer 5a and the layer 5a via the second injection unit 21B. As a result, the rubber material G2 is filled between the metal bush 3 and the first layer 5a of the elastic member 5. Then, the filled rubber material G2 is vulcanized, and heat and pressure are applied to the vulcanized rubber material G2. As a result, the first layer 5a of the elastic member 5 and the rubber material G2 are vulcanized and bonded, and the metal bush 3 and the rubber material G2 are vulcanized and bonded, so that the first layer 5a of the elastic member 5 and the resin member 7 are vulcanized and bonded. A second layer 5b formed of fluororubber is formed between the two. Further, by the above vulcanization adhesion, an adhesive layer 11 is formed between the first layer 5a of the elastic member 5 and the second layer 5b of the elastic member 5 (interface), and the second layer 5b of the elastic member 5 and the resin are formed. An adhesive layer 13 is formed between the member 7 and the member 7.

Through the above steps, the elastic member 5 composed of the first layer 5a and the second layer 5b is formed between the metal bush 3 and the resin member 7. The elastic member 5 removes burrs and the like, if necessary.

[Tooth cutting process]
In the gear cutting process, the resin member 7 is geared. Applicable gear cutting includes finishing with a hobbing or shaving machine. As the hobbing board, for example, GE15A (trade name) manufactured by Mitsubishi Heavy Industries, Ltd. can be used. The cutting amount by the hobbing machine is 200 μm or more. As the shaving board, for example, FE30A (trade name) manufactured by Mitsubishi Heavy Industries, Ltd. can be used. The amount of cutting by shaving is small, about 20 to 150 μm. The tooth profile 7b is formed on the resin member 7 by the gear cutting process.

The resin gear 1 is manufactured by the above steps.

In the resin gear 1 of the above embodiment, as shown in FIGS. 1 and 2, in addition to the second layer 5b formed of fluororubber, nitrile rubber and acrylic rubber are arranged at the interface with the metal bush 3. Alternatively, an elastic member 5 having a first layer 5a formed of natural rubber is provided between the metal bush 3 and the resin member 7. As a result, the annular metal bush 3 comes into contact with the first layer 5a formed of nitrile rubber, acrylic rubber or natural rubber, which has lower non-contact and slipperiness than fluororubber and has excellent adhesion to metal. Since it is coupled to the elastic member 5 in this state, it is possible to increase the bonding force between the elastic member 5 and the metal bush 3 as compared with the case where the elastic member made of a single fluororubber and the metal bush 3 are bonded. can. Further, as compared with the case where a layer formed of nitrile rubber, acrylic rubber or a natural rubber alone is provided between the metal bush 3 and the resin member 7, chemical resistance, heat resistance and the like can be improved. As a result, even when fluororubber is used as the elastic member 5, a desired damping function can be obtained.

In the resin gear 1 of the above embodiment, the layer thickness T11 of the first layer 5a may be smaller than the layer thickness T12 of the second layer 5b. As a result, it is possible to increase the bonding force between the elastic member 5 and the metal bush 3 while maintaining superiorities such as strength, oil resistance, and heat resistance.

Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

For example, the resin gear 101 as shown in FIGS. 4 and 5 may be used. That is, in the resin gear 101, in addition to the configuration of the resin gear 1 of the above embodiment, the annular metal member 8 coupled to the inner peripheral surface of the resin member 7 between the resin member 7 and the elastic member 5 And the adhesive layers 13 and 15 are further provided. Further, the elastic member 5 further has a third layer 5c provided at the interface with the metal member 8 in the radial direction and provided outside the second layer 5b in the radial direction. The third layer 5c is made of nitrile rubber, acrylic rubber or natural rubber.

An adhesive layer 9 formed during vulcanization adhesion is arranged between the metal bush 3 and the first layer 5a of the elastic member 5. An adhesive layer 11 formed during vulcanization adhesion is arranged between the first layer 5a of the elastic member 5 and the second layer 5b of the elastic member 5. An adhesive layer 13 formed during vulcanization adhesion is arranged between the second layer 5b of the elastic member 5 and the third layer 5c of the elastic member 5. An adhesive layer 15 formed during vulcanization adhesion is arranged between the third layer 5c of the elastic member 5 and the metal member 8. In FIG. 4, the adhesive layers 9, 11, 13, and 15 are not shown.

An example of the size (layer thickness) T2 in the radial direction R of the elastic member 5 is 2 mm to 65 mm. The layer thickness of the third layer 5c is smaller than the layer thickness of the second layer 5b. An example of the layer thickness T23 of the third layer 5c is 0.1 mm to 20 mm, and an example of the layer thickness T22 of the second layer 5b is 0.8 mm to 25 mm. The ratio of the layer thickness T23 of the third layer 5c to the layer thickness T21 of the second layer 5b is 1: 1.25 to 1: 8. The ratio of the layer thickness T21 of the first layer 5a to the layer thickness T22 of the second layer 5b is the same as that of the above embodiment.

Since the resin gear 101 according to the modified example is provided with the annular metal member 8 on the inner peripheral surface of the resin member 7, it can be fastened to the metal shaft by a method such as press fitting or shrink fitting. In this case, in addition to the first layer 5a formed of nitrile rubber or the like and the second layer 5b formed of fluororubber, it is arranged at the interface with the annular metal member 8 and formed of nitrile rubber, acrylic rubber or natural rubber. An elastic member 5 further having the third layer 5c is provided between the metal bush 3 and the metal member 8. As a result, the annular metal member 8 is bonded to the elastic member 5 in contact with the third layer 5c, so that it is more elastic than the case where the elastic member 5 made of fluororubber alone and the metal member 8 are bonded. The bonding force between the member 5 and the metal member 8 can be increased. As a result, even when fluororubber is used as the elastic member 5, a desired damping function can be obtained.

Further, in the resin gear 101 according to the modified example, the layer thickness T13 of the third layer 5c may be smaller than the layer thickness T12 of the second layer. As a result, it is possible to increase the bonding force between the elastic member 5 and the metal member 8 while maintaining superiorities such as strength, oil resistance, and heat resistance.

In the above embodiment, the example in which the outer peripheral surface of the metal bush 3 is formed flat has been described, but it may have a plurality of protrusions protruding outward from the outer peripheral surface. In a resin gear having a metal bush on which this protrusion is formed, the bonding force between the metal bush and the resin material can be strengthened.

In the above embodiment or modification, the example of indirect adhesion using a vulcanization adhesive has been described, but direct adhesion may be performed without using a vulcanization adhesive.

In the above embodiment, the embodiment in which the resin gear 1 is a spur gear has been described as an example. However, the resin gear 1 may be a helical gear or the like.

1,101 ... Resin gear, 3 ... Metal bush, 5 ... Elastic member, 5a ... First layer, 5b ... Second layer, 5c ... Third layer, 7 ... Resin member, 7b ... Tooth profile, 8 ... Metal member ..

Claims (6)

An annular metal bush and
An annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and an annular resin member.
An annular elastic member provided between the metal bush and the resin member is provided.
The elastic member has a first layer provided on the interface side with the metal bush in the radial direction and a second layer provided outside the first layer in the radial direction.
The second layer is made of fluororubber and the first layer is made of nitrile rubber, acrylic rubber or natural rubber .
The first layer is arranged between the metal bush and the second layer in the radial direction.
A resin gear in which the outer peripheral surface of the metal bush and the inner peripheral surface of the first layer are fixed to each other, and the outer peripheral surface of the first layer and the inner peripheral surface of the second layer are fixed to each other . The resin gear according to claim 1, wherein the layer thickness of the first layer is smaller than the layer thickness of the second layer. The resin gear according to claim 1 or 2, wherein the layer thickness of the first layer is 0.1 mm to 20 mm. An annular metal bush and
An annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and an annular resin member.
An annular elastic member provided between the metal bush and the resin member,
An annular metal member provided between the resin member and the elastic member and bonded to the inner peripheral surface of the resin member is provided.
The elastic member includes a first layer provided on the interface side with the metal bush in the radial direction, a second layer provided outside the first layer in the radial direction, and the metal member in the radial direction. It has a third layer provided at the interface and provided outside the second layer in the radial direction.
The first layer is formed of nitrile rubber, acrylic rubber or natural rubber, the second layer is formed of fluororubber, and the third layer is formed of nitrile rubber, acrylic rubber or natural rubber. Resin gear. The resin gear according to claim 4, wherein the layer thickness of the third layer is smaller than the layer thickness of the second layer. The resin gear according to claim 4 or 5, wherein the layer thickness of the third layer is 0.1 mm to 20 mm.

Images