JP4844495B2 - Fiber reinforced plastic gear - Google Patents

Description

  The present invention relates to a fiber reinforced resin gear.

  Conventionally, a fiber reinforced resin gear has advantages such as low meshing noise, light weight, and low rotational inertia, and is used, for example, in a reduction gear mechanism of an electric power steering apparatus in which high surface pressure acts on a gear portion. Sometimes. As an example of such a fiber reinforced resin gear, there is a fiber reinforced resin gear in which the reinforcing fibers are spiral on the meshing surface even when the outer periphery of the ring-shaped material made of fiber reinforced resin is geared. It has been proposed (see, for example, Patent Document 1).

  The fiber reinforced resin gear described in Patent Document 1 uses a prepreg having reinforcing fibers, and the reinforcing fibers include first fibers oriented 90 ° / 0 ° and ± 45 ° oriented embedded in the tooth root portion. Second fibers. And the layer which consists of a 1st fiber and a 2nd fiber is formed in the tooth root part which the largest stress produces in a tooth part, and it sets so that the ratio of the 2nd fiber may be larger than the 1st fiber. It has been enhanced with.

In addition, as other fiber reinforced resin gears, two types of prepregs composed of soft fibers and hard fibers are used, and relatively more soft fibers with good workability are disposed on the outermost periphery than hard fibers. In the vicinity of the tooth root, a structure in which hard fibers are disposed relatively more than soft fibers has been proposed (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 5-240324 JP-A-6-91770

  However, the fiber reinforced resin gear described in Patent Document 1 employs a method in which two types of prepregs are wound in a stacked state to be formed into a rod shape, and the rod ends are combined to form a donut shape before being molded. Therefore, the first fiber and the second fiber have a spiral shape. When the first fiber and the second fiber are spiral, the strength design for the fiber reinforced resin portion is limited. For example, in the radial cross section of the fiber reinforced resin gear, the strength increases from the inside toward the outside. It is difficult to design.

  Moreover, in the fiber reinforced resin gear described in Patent Document 2, the fiber reinforced resin gear described in Patent Document 1 is wound in a spiral shape, and a soft fiber made of aramid fiber and a hard fiber made of carbon fiber. Since the strength is set by adjusting the relative proportions of these, there is a drawback that the strength design for the fiber reinforced resin portion is limited.

  The present invention has been made in view of the above problems, and its purpose is to ensure the continuity of the fibers of the fiber tissue layer in the tooth portion, and the fiber in which the fiber tissue layer is formed in a spiral shape. Provided is a fiber reinforced resin gear capable of improving the degree of freedom in setting strength compared to a reinforced resin gear.

  In order to achieve the above object, the invention according to claim 1 is a fiber reinforced resin gear in which a fiber reinforced resin portion is formed at least on the outer peripheral portion, and a plurality of teeth are formed on the fiber reinforced resin portion. The fiber reinforced resin portion is formed by impregnating a fiber tissue body with a resin, the fiber tissue body has a plurality of fiber tissue layers, and the plurality of fiber tissue layers correspond to the tooth portions. The gist is that the portion has at least continuous fibers reaching the tooth root portion, and is formed so as to be concentric in an independent state in a radial cross section.

  Here, the “fiber structure layer” means a structure in which continuous fibers are structured, and includes, for example, a woven fabric or a braid. The “radial section” means a surface including the axis of the fiber reinforced resin gear and orthogonal to the outer periphery of the fiber reinforced resin gear.

  In the present invention, for example, even when a tooth portion is formed by cutting a fiber reinforced resin portion, a plurality of fiber tissue layers are independent ring-shaped in a radial section of a portion corresponding to the tooth portion. In the tooth portion, there are a plurality of continuous fibrous tissue layers. And since the fiber of the fiber structure layer in the part corresponding to the tooth part is continuous, compared to the case where the tooth part is formed by cutting the fiber reinforced resin reinforced by the hoop-wrapped continuous fiber, The mechanical property which is the feature of continuous fiber can be provided to the part.

  Further, in the radial cross section of the fiber reinforced resin gear, a plurality of annular fiber structure layers are concentrically formed in an independent state, and each fiber structure layer is not formed in a spiral shape. Therefore, if the roughness, orientation, fiber type, etc. of each fiber structure layer are set, the strength of the fiber reinforced resin portion can be set for each fiber structure layer. Therefore, for example, the strength of the fiber reinforced resin portion is different for each fiber tissue layer as compared to the case where the fiber tissue body is configured from a plurality of fiber tissue layers formed in a spiral shape in the radial cross section of the fiber reinforced resin gear. Since it can set finely, the freedom degree at the time of setting the intensity | strength of a fiber reinforced resin gear improves.

The gist of the invention of claim 2 is that, in the invention of claim 1, at least one of the plurality of fiber tissue layers has a different fiber volume content.
In this invention, for example, if the fiber structure layer is formed using fibers having the same thickness, the fiber volume content of the fiber structure layer can be changed by changing the roughness of the fiber structure layer. . And if the fiber volume content rate of a fiber structure layer can be changed, since the intensity | strength of a fiber reinforced resin part can be changed with a site | part, the freedom degree at the time of setting intensity | strength in a fiber reinforced resin part improves.

  According to a third aspect of the present invention, in the second aspect of the invention, of the plurality of fibrous tissue layers, an outer fibrous tissue layer has a smaller fiber volume content than an inner fibrous tissue layer. The gist is that it is formed.

  In this invention, since the inner fiber tissue layer has a larger fiber volume content than the outer fiber tissue layer, the strength of the root portion corresponding to the inside of the tooth portion can be made larger than the tip portion of the tooth portion. it can. Therefore, it is advantageous in terms of strength when used as a gear.

  Moreover, since the fiber volume content rate of the fiber reinforced resin part comprised from the outer fiber structure layer becomes small, the hardness of the outer peripheral part of a fiber reinforced resin part becomes low. Therefore, since the outer periphery of the fiber reinforced resin portion can be easily cut, a tooth portion is easily formed on the outer periphery of the fiber reinforced resin portion.

  According to the present invention, the fiber continuity of the fiber structure layer in the tooth portion can be ensured, and the degree of freedom in setting the strength from the fiber reinforced resin gear in which the fiber structure layer is formed in a spiral shape. Can be improved.

Hereinafter, an embodiment in which the present invention is embodied in a worm wheel used for a worm gear will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the worm gear 11 includes a metal worm 13 having a helical and continuous tooth portion 12 formed on the outer periphery, and a worm wheel 14 as a fiber reinforced resin gear meshing with the worm 13. Has been. The worm 13 has a first end connected to an output shaft of a drive device (not shown), and is configured so as to apply a rotational force to the worm wheel 14 from the worm 13 side.

  The worm wheel 14 is provided with a ring-shaped metal core 15 at the center thereof, and a fiber reinforced resin portion 16 is provided so as to be integrated with the metal core 15 so as to surround the outer periphery of the metal core 15.

  The fiber reinforced resin portion 16 is formed with a plurality of tooth portions 17 that mesh with the tooth portions 12 of the worm 13 by cutting the outer peripheral portion thereof. As shown in FIG. 2, the fiber reinforced resin portion 16 is formed by impregnating a thermoplastic resin into the braided layers R1 to R7 as a plurality of fiber texture layers formed by knitting reinforcing fibers in a braided shape. Has been. An aramid fiber is used as the reinforcing fiber, and a polyamide-based synthetic resin is used as the thermoplastic resin.

  Each assembly layer R1 to R7 is formed in a closed ring shape in the radial cross section of the worm wheel 14 corresponding to the tooth portion 17, and is concentrically arranged in an independent state in the radial cross section of the worm wheel 14. . Specifically, each of the braided layers R1 to R7 is formed such that, in the radial cross section of the worm wheel 14, the entire circumference is closed by 360 °, and the outline is substantially rectangular. Each braided layer R1 to R7 is knitted using reinforcing fibers having the same thickness and knitted to have the same orientation. And each braid layer R1-R7 has a coarser grain, so that the layer which is spaced apart from the center O of each braid layer R1-R7 arrange | positioned concentrically in radial direction cross section. Therefore, the innermost braid layer R1 has the largest amount of fibers per unit volume, and the outermost braid layer R7 has the smallest amount of fibers per unit volume. Therefore, the fiber reinforced resin part 16 is formed so that the fiber volume content decreases as the distance from the center O of each braided layer R1 to R7 increases in the radial cross section. In addition, as shown in FIG. 1, the continuous fiber which reaches to the tooth root part 17a exists in the part corresponding to the tooth part 17 among the braided layers R5 to R7. Part of the braid layers R5 to R7 is exposed from the meshing surface 18 of the worm wheel 14. Further, the assembled layers R5 to R7 appear from the tooth bottom surface 19 and extend along the circumferential direction of the worm wheel 14. In addition, the “radial direction of the worm wheel” is a direction that passes through the axis P of the worm wheel 14 and is orthogonal to the outer periphery of the worm wheel 14 (arrow Y direction shown in FIG. 1). That is, the direction is orthogonal to the axis P. The “radial section of the worm wheel” means a surface that passes through the axis P of the worm wheel 14 and is orthogonal to the outer periphery of the worm wheel 14. That is, it is a cross section cut by a plane including the axis P. Moreover, in FIG.1 and FIG.2, resin between each braided layer is abbreviate | omitted and shown in FIG. 2, for convenience of drawing, after omitting hatching of the fiber reinforced resin part 16, each braided layer is shown. It is shown.

Next, a method for manufacturing the worm wheel 14 will be described.
First, in order to knit a plurality of braided layers R1 to R7, a rod-shaped core material 20 is prepared, the core material 20 is arranged at the center of a stringing machine (not shown), and the stringing machine is arranged on the outer periphery of the core material 20 On the other hand, the reinforcing fibers are knitted into a braid. Next, when the work of knitting the braid layer R1 to a length longer than the outer periphery of the cored bar 15 is finished, the reinforcing fibers existing between the unillustrated stringing portion (carrier) and the assembling point of the braid layer R1. Is cut by a cutting device (not shown). Then, the core material 20 is returned to the original position, and the work of knitting the braid layer R2 covering the outer periphery of the braid layer R1 is performed again. Furthermore, when the work of knitting the braided layers R3 to R7 is repeated five times in the same manner, as shown in FIG. 3A, the seven layered layers R1 to R7 form a seven-layer structure 21. Produced. As shown in FIG.3 (b), the fiber structure 21 is a cylinder shape, and is comprised in the state on which seven assembly layers R1-R7 were piled up concentrically. In addition, when performing the operation | work which forms the braid layers R1-R7, it knitted so that the braid layers R1-R7 which are separated from the core material 20 may become coarser. However, the braids illustrated in FIGS. 3A and 3B are illustrated as braids having the same eye roughness for convenience of drawing.

  Thereafter, the core material 20 is extracted from the fibrous structure 21, and a part of both end portions 21a of the fibrous structure 21 is excised to form the both end portions 21a in an oblique shape and the same shape. And as shown in FIG.3 (c), the fiber structure 21 is curved and it deform | transforms cyclically | annularly by abutting the both ends 21a.

  Thereafter, in a molding die (not shown) composed of a lower die and an upper die, the ring-shaped cored bar 15 is arranged in a state of being positioned on the lower die, and the annularly deformed fiber structure 21 is then formed into the molding die. The outer periphery of the cored bar 15 is surrounded by being disposed in the cavity. Next, in a state where the upper mold is lowered and the fibrous structure 21 disposed in the cavity is pressed and compressed, a polyamide-based synthetic resin melted into the cavity from an injection hole (not shown) is injected into the fibrous structure. The body 21 is impregnated. When the fiber structure body 21 is impregnated with the polyamide-based synthetic resin, the fiber structure body 21 is then cooled to solidify the polyamide-based synthetic resin so that the fiber-reinforced resin portion 16 is formed on the outer peripheral portion. The molded body is completed. In addition, since the groove part 15a (refer FIG. 2) which makes one round along an outer periphery is formed in the outer peripheral part of the metal core 15, and it shape | molds in the state which the polyamide-type synthetic resin entered in the groove part 15a, the fiber reinforced resin part 16 Are bonded so as not to separate from the cored bar 15.

  Thereafter, the molded body is taken out from the molding die, and an outer peripheral portion (portion corresponding to the assembly layers R5 to R7) of the fiber reinforced resin portion 16 constituting the molded body is cut. At this time, the outer peripheral portion of the fiber reinforced resin portion 16 has a smaller fiber volume content than the vicinity of the center portion O in the radial cross section of the worm wheel 14, and therefore can be easily cut. Then, by cutting the fiber reinforced resin portion 16, tooth portions 17 are formed on the outer peripheral portion, and when all the tooth portions 17 are formed, the fiber reinforced resin worm wheel 14 is completed.

Next, the operation of the worm wheel 14 will be described.
In the worm gear 11, when the worm 13 is rotated by a driving device (not shown), a rotational force is transmitted from the worm 13 to the worm wheel 14. Here, since the transmission of the rotational force is performed by sequentially meshing the tooth portion 12 and the tooth portion 17, when the rotational force is transmitted, the meshing surface 18 of the tooth portion 17 is applied from the tooth portion 12 of the worm 13. High surface pressure is applied. However, the tooth portion 17 of the worm wheel 14 is a part of the fiber reinforced resin portion 16, and in the tooth portion 17, the fibers of the braided layers R <b> 5 to R <b> 7 continue to the tooth root portion 17 a in the radial cross section of the worm wheel 14. Therefore, the mechanical properties (for example, high strength, high elasticity, etc.) of the continuous fiber are imparted to the tooth portion 17 without being impaired. In particular, in the fiber reinforced resin portion 16, the portion from the braid layer R1 to the braid layer R5 has a higher fiber volume content than the portion from the braid layer R6 to the braid layer R7. The strength of the portion 17 near the tooth root portion 17 a is set higher than that of the tooth edge portion 17. Therefore, even if stress concentrates on the vicinity of the root portion 17a of the tooth portion 17, the damage is suppressed, and even if a high surface pressure is applied to the meshing surface 18 of the tooth portion 17, the tooth portion 17 has a sufficient pressure. The worm wheel 14 can rotate without any trouble.

According to this embodiment, the following effects can be obtained.
(1) The worm wheel 14 has a fiber reinforced resin portion 16 formed on the outer periphery thereof. The fiber reinforced resin portion 16 is formed with a plurality of concentric layers in a state where the closed ring-shaped braid layers R1 to R7 are independent in the radial cross section of the worm wheel 14. Therefore, even when the fiber reinforced resin portion 16 is cut to form the tooth portion 17, continuous fibers are present in the portions of the braided layers R5 to R7 corresponding to the tooth portion 17. Moreover, it can suppress that the mechanical characteristic of the reinforced fiber which comprises the assembly layers R1-R7 is impaired, and sufficient intensity | strength can be set to the tooth root part 17a of the tooth part 17. FIG.

  (2) The strength of the fiber reinforced resin portion 16 can be set for each of the assembly layers R1 to R7 by setting the roughness, orientation, fiber type, and the like of each assembly layer R1 to R7. Therefore, in the radial cross section of the worm wheel 14, the coarseness, orientation, and fiber type of the braid layers R1 to R7 are set as compared with the case where the fiber reinforced resin portion is formed from a plurality of spiral braid layers. Only by doing, since it can set to desired intensity | strength for each assembly layer R1-R7 in the fiber reinforced resin part 16, the freedom degree at the time of setting intensity | strength with respect to the fiber reinforced resin part 16 improves.

  (3) In the fiber reinforced resin part 16, it is formed so that fiber volume content may change for each braided layer R1-R7. And, for example, the fiber volume content of the braided layers R1 to R7 can be changed by changing the roughness of the braided layers R1 to R7 after using reinforcing fibers of the same thickness. If it changes, the intensity | strength of the fiber reinforced resin part 16 can be changed with a site | part. Therefore, the degree of freedom when setting the strength of each part in the fiber reinforced resin portion 16 is improved.

  (4) It is formed so that fiber volume content rate may become small, so that it is the braid layers R1-R7 spaced apart from the center O of the braid layers R1-R7. And the fiber volume content rate in the tooth part 17 is set so that the direction of the tooth root part 17a may become larger than the tooth tip part. Therefore, even if stress concentrates in the vicinity of the tooth root portion 17a of the tooth portion 17, damage is suppressed, and the worm wheel 14 that is advantageous in strength can be obtained.

  (5) In the fiber reinforced resin portion 16, the portion corresponding to the outer braid layers R5 to R7 cut when forming the tooth portion 17 is compared to the portion corresponding to the inner braid layers R1 to R4. Thus, the fiber volume content is reduced. Therefore, since the hardness of the outer peripheral part of the fiber reinforced resin part 16 cut when forming the tooth part 17 becomes low, it is easy to cut and form a tooth part.

  (6) The fiber structure 21 is comprised by the braided layers R1-R7. Here, in the case of producing a fiber structure using a woven fabric woven in a bag weave, after weaving woven fabrics with different widths one by one, it is necessary to carry out the operation of covering the core materials sequentially on the core material. It is. On the other hand, when constructing the fiber structure 21 with the braided layers R1 to R7, a plurality of braided layers R1 to R7 are knitted on the outer peripheral portion of the core member 20 by a cord making machine, If the core material 20 is removed, the fibrous structure 21 having a plurality of braided layers R1 to R7 that are concentrically arranged in an independent state can be manufactured. Therefore, since the operation of knitting the braid can be repeatedly performed, the fiber structure can be manufactured more efficiently than when the fiber structure is manufactured using the woven fabric in the bag weave.

The present embodiment is not limited to the above, and may be embodied as follows, for example.
In the fiber reinforced resin portion, the fiber volume content distribution in the radial cross section of the worm wheel may be changed. For example, you may form so that the fiber volume content rate may become large as it separates from the center O of the braided layers R1-R7 arrange | positioned concentrically in a fiber reinforced resin part. In this case, when a fiber structure having a multi-layer structure composed of a plurality of braided layers is manufactured, the reinforcing fiber having the same thickness is used, and the braid that is farther from the center O becomes finer. Organize each assembly. If comprised in this way, the fiber volume content rate of a fiber reinforced resin part can be set so that the outer side may become larger than inner side (center O side of a braided layer). Further, the fiber volume content of the fiber reinforced resin portion from the center O to the braid layer R3 and the fiber reinforced resin portion outside the braid layer R5 is the fiber volume content of the fiber reinforced resin portion from the braid layer R3 to the braid layer R5. You may set so that it may become smaller. Further, the fiber volume content may not be changed continuously in the order of the braided layers R1 to R7. For example, the fiber volume content may be changed in two stages and three stages.

  (Circle) You may change the method of setting the fiber volume content rate of each braided layer R1-R7. Instead of changing the fiber volume content by changing the roughness when knitting each assembled layer R1 to R7, for example, the same roughness when knitting each assembled layer R1 to R7 As it is, when the braided layers R1 to R7 are knitted, the fiber volume content of each braided layer R1 to R7 may be changed by using reinforcing fibers having different thicknesses.

  ○ The method for setting the strength of the fiber-reinforced resin portion may be changed. Instead of setting the strength of the fiber reinforced resin part by changing the fiber volume content of the fiber reinforced resin part, for example, when forming each assembly layer, the orientation of the reinforced fiber is changed by changing the orientation of the fiber reinforced resin part. The intensity may be set. Moreover, you may set the intensity | strength of a fiber reinforced resin part by changing the kind of reinforced fiber used for each braided layer. In addition, if the strength of the fiber reinforced resin part is set by changing the orientation of the reinforcing fibers constituting each braided layer and the type of reinforcing fiber used in the braided layer, the fiber volume of the fiber reinforced resin part The content rate may be constant.

  ○ When forming a fiber structure having a multi-layer structure with a string making machine, the reinforcing fiber cutting operation performed every time after the braid layer is knitted to a preset length may be omitted. In this case, for example, after knitting a braided layer of a preset length, the reinforcement existing between the braided machine holding unit and the knitted braided layer that holds the reinforcing fibers when knitting is started. Cut the fiber. Then, the braided layer is placed so that it enters the space between itself and the core little by little from the end of the braided layer in the free state. Is done. After that, the stringing portion is moved to the position where the knitting of the reinforcing fiber is started, and the reinforcing fiber is knitted again. When the braided layer having a preset length is knitted, the core material is again placed inside. The work to turn the braided layer upside down is performed. If such an operation is performed, it is not necessary to repeatedly perform the cutting operation of the reinforcing fibers, and a fiber structure having a multi-layer structure can be formed by performing the operation by bending the string making portion a plurality of times. In addition, a fiber structure having a multi-layer structure may be manufactured by forming a braided layer having a predetermined length with a string-forming portion and then folding the string-forming portion to perform knitting. In this case, if the driving device that drives the string portion is configured to be movable to the opposite side, the string portion is knitted to an arbitrary length and then folded back to the outer periphery of the braid layer. Furthermore, a braid layer can be knitted.

  ○ The number of layers of the fiber structure layer in the fiber reinforced resin part may be a plurality of layers, and the fiber reinforced resin part may be composed of less than 7 fiber structure layers, or the number of layers greater than 7 layers. You may comprise a fiber reinforced resin part from a fiber structure layer.

  (Circle) in the radial direction cross section of a fiber reinforced resin part, you may change so that two sets of several braided layer groups arrange | positioned concentrically may be formed independently. In this case, prepare two fibrous structures that have been deformed into an annular shape, place the two fibrous structures that have been deformed into an annular shape in the mold cavity, and then compress the two fibrous structures with the upper mold. To do. In addition, when overlapping two fiber structures, it arrange | positions so that the part with which both ends of each fiber structure are faced | abutted may shift | deviate 180 degrees. Then, if the resin injection process and the heating process are performed in the mold, the fiber reinforced resin part having two braided layers arranged concentrically in an independent state in the radial cross section is formed. can do.

  The fiber structure layer is not limited to a substantially rectangular shape as long as the entire circumference of the worm wheel 14 is 360 ° closed in the radial cross section of the worm wheel 14, and the fiber structure layer is a perfect circle or an ellipse. You may change to

○ Monomer cast nylon may be used as the polyamide constituting the molded body.
○ The resin impregnated in the fibrous structure may be changed. Instead of impregnating the polyamide resin as the thermoplastic resin, the fiber reinforced resin portion may be formed by impregnating the fibrous structure with polycarbonate, polybutylene terephthalate or polyacetal as the thermoplastic resin as another engineering plastic. Good. Moreover, you may impregnate a fiber structure | tissue with the epoxy resin and phenol resin as a thermosetting resin.

  O You may change the kind of reinforcing fiber which comprises the braided layers R1-R7. For example, the braid layer may be knitted using carbon fibers as reinforcing fibers. Depending on the properties required for the fiber-reinforced resin gear, the braid layer may be knitted using glass fibers or polyester fibers as the reinforcing fibers.

  (Circle) instead of comprising a fiber structure from a braided layer, you may comprise a fiber structure from the textile as a fiber structure layer formed, for example by bag weaving. In this case, for example, after weaving a plurality of woven fabrics having different widths by bag weaving, a rod-shaped core material is prepared, and the core material is covered with a plurality of woven fabrics to produce a multi-layered fiber structure. Then, if the core material is removed and the fiber structure is placed in the mold and molded, a molded body made of fiber reinforced resin can be formed.

The fiber reinforced resin gear of the present invention may be applied to a spur gear or a planetary gear instead of being applied to a worm wheel.
The fiber tissue layer may be formed concentrically in a state where each fiber tissue layer formed in a ring shape is independent in a radial cross section, and each fiber tissue layer may not be a closed ring shape. For example, as shown in FIG. 4, each braid layer R1 to R7 is formed in a ring shape with a part opened in the radial cross section of the fiber reinforced resin part 16 so that the open parts do not overlap with each other. You may arrange in a shape. The following technical idea (invention) can be understood from the embodiment.

The fiber reinforced resin gear according to any one of claims 1 to 3, wherein the fiber structure is composed of a plurality of fiber structure layers made of a braid.
○ In an annular gear molded body in which a fiber reinforced resin portion is formed at least on the outer periphery, the fiber reinforced resin portion is formed by impregnating a resin into a fiber structure, and the fiber structure includes a plurality of fibers. A molded article for gears, which is constituted by a tissue layer, wherein the fiber tissue layer is formed in a closed ring shape in a radial cross section and is concentric in an independent state.

The perspective view of the worm gear in this embodiment. The partial schematic cross section of the worm wheel in this embodiment. (A) is a partial fracture | rupture schematic diagram of a fiber structure, (b) is a schematic cross section of a fiber structure, (c) is a model perspective view which shows the fiber structure deform | transformed cyclically | annularly. The partial schematic cross section of the worm wheel in another embodiment.

Explanation of symbols

  R1 to R7: a braided layer as a fiber structure layer, 14: a worm wheel as a fiber reinforced resin gear, 16 ... a fiber reinforced resin part, 17 ... a tooth part, 17a ... a root part, 21 ... a fiber structure.

Claims (3)

In a fiber reinforced resin gear in which a fiber reinforced resin portion is formed at least on the outer periphery, and a plurality of teeth are formed on the fiber reinforced resin portion,
The fiber reinforced resin portion is formed by impregnating a fiber structure with resin,
The fibrous structure has a plurality of fibrous structure layers,
The plurality of fiber tissue layers have at least continuous fibers that reach the tooth root portion in a portion corresponding to the tooth portion, and are formed in a ring shape and are concentric in an independent state in a radial cross section. A fiber reinforced resin gear, characterized in that it is formed. The fiber-reinforced resin gear according to claim 1, wherein at least one of the plurality of fiber structure layers has a different fiber volume content. 3. The fiber reinforcement according to claim 2, wherein among the plurality of fiber tissue layers, the outer fiber tissue layer is formed so that the fiber volume content is smaller than the inner fiber tissue layer. Resin gear.

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