JP7252889B2 - Fluctuating load transmission part for straddled vehicle, injection molding method for straddled vehicle and clutch hub - Google Patents

Description

The present invention relates to a straddled vehicle fluctuating load transmission component to which a fluctuating load is input, a straddled vehicle provided with the straddled vehicle fluctuating load transmission component, and an injection molding method for a clutch hub. Regarding.

In a straddled vehicle such as a motorcycle, the power of the engine is transmitted to the rear wheels, which are driving wheels. Here, torque fluctuations of the engine are transmitted to the rear wheels during acceleration, deceleration, and the like. In order to mitigate this torque fluctuation, for example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-178229), etc., a sprocket connected to a drive chain is provided with a clutch hub and a rear wheel is provided with a wheel hub, and a hub damper is provided. A straddled vehicle is known in which a clutch hub and a wheel hub are connected to each other.

In Patent Document 1, wheel hubs and clutch hubs that receive fluctuating loads are generally made of a metal material in order to ensure rigidity. A damper rubber is provided between a partition formed on the wheel hub and a claw provided on the driven flange. The pawl transmits engine power to the partition wall of the wheel hub via the damper rubber. This mitigates torque fluctuations.

JP 2011-178229 A

By the way, along with the demand for weight reduction of the straddled vehicle, there is also a demand for weight reduction of straddled vehicle component parts used in the straddled vehicle. Reducing the thickness of the straddled vehicle component to reduce the weight of the straddled vehicle component reduces the stiffness of the straddled vehicle component.

As described above, there is a demand for further weight reduction while ensuring the rigidity of structural parts for straddled vehicles. In addition, components for straddled vehicles must meet the demands of their application. Specifically, regarding components to which fluctuating loads are input or output, such as clutch hubs, as described above, in addition to securing rigidity and reducing weight, the load felt by the occupant of the straddle vehicle, such as torque fluctuations, is reduced. There is a demand to mitigate fluctuations.

INDUSTRIAL APPLICABILITY The present invention is a straddle vehicle variation that can further reduce weight while ensuring rigidity, and can mitigate variations in the input load or output load to mitigate variations felt by the occupant of the straddle vehicle. It is an object of the present invention to provide a load component, a straddled vehicle with the same and a method of injection molding a clutch hub.

A straddled vehicle fluctuating load transmission component according to an embodiment of the present invention is used in a straddled vehicle having a rear arm that supports rear wheels, a seat on which an occupant sits, and a vehicle body frame that supports a drive source. A variable load input unit for inputting a variable load, a variable load output unit for outputting the variable load, and a variable load output unit for outputting the variable load input to the variable load input unit. A fluctuating load transmission component for a straddled vehicle, comprising a fluctuating load transmission part that transmits to
The straddle vehicle variable load transmission component is attached to the rear arm, the drive source, or the vehicle body frame, or provided in a power transmission path between the drive source and the rear wheel,
The fluctuating load input section and the fluctuating load output section are arranged at positions separated in a direction different from the input direction of the fluctuating load input to the fluctuating load input section, and the fluctuating load input section and the fluctuating load transmission The section and the variable load output section are integrally molded with fiber-reinforced resin.

As a result, by using fiber-reinforced resin as the material for the variable load transmission parts for straddled vehicles and utilizing the material characteristics, the variable load transmission parts for straddled vehicles themselves can be obtained while ensuring the weight reduction and rigidity of the variable load transmission members. The effect of alleviating the fluctuating load is obtained.

Furthermore, it is possible to further reduce the weight while ensuring the rigidity, and it is possible to alleviate the fluctuations of the input load or the output load, thereby reducing the fluctuations felt by the occupant of the straddled vehicle.

Furthermore, by disposing the fluctuating load input section and the fluctuating load output section at positions separated from each other in a direction different from the input direction of the fluctuating load input to the fluctuating load input section, the tensile force is applied to the fluctuating load transmission section. works. Since the fiber reinforced resin has strength against tensile force, the variable load transmission portion is slightly deformed by the tensile force, and the deformation can reduce the load fluctuation.

Therefore, with the above-described configuration, it is possible to obtain a variable load transmission component for a straddle vehicle that is lightweight, secures rigidity, and also provides the effect of reducing the variable load.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The fiber-reinforced resin is a carbon-fiber-reinforced resin in which the resin is reinforced with carbon fibers.

In this way, by using a carbon fiber reinforced resin reinforced with carbon fibers as the fiber reinforced resin, it is possible to reduce the weight of the variable load transmission component for a straddle vehicle and improve the rigidity.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The fibers are arranged in the fiber-reinforced resin so as to extend in a direction different from the input direction of the fluctuating load input to the fluctuating load input section.

Thus, by arranging the fibers in the fiber-reinforced resin so as to extend in a direction different from the input direction of the fluctuating load input to the fluctuating load input section, the strength against the fluctuating load applied can be increased. can.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The fibers are independent of each other and have a predetermined length.

As a result, it is possible to reduce the weight of the straddled vehicle fluctuating load transmission component, and to easily manufacture the straddled vehicle fluctuating load transmission component that ensures rigidity and obtains the effect of absorbing the fluctuating load.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The fluctuating load transmission component for a straddled vehicle includes a disc-shaped main body portion having a through hole through which an axle passes, and protruding in the axial direction of the axle from a first surface of the main body portion so as to surround the through hole. an annular rib; a claw portion provided on a second surface of the main body portion so as to radially extend in a radial direction; and a metal fastening member that secures the connected rear wheel sprocket.

As a result, it is possible to reduce the torque fluctuation load of the engine while ensuring weight reduction and rigidity.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The fibers are arranged in the fiber-reinforced resin so as to extend in the protruding direction of the claw portion.

As a result, it is possible to provide the strength in the direction to be strengthened against the external force applied to the claw portion.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. A straddled vehicle fluctuating load transmission component includes a wheel hub having a claw portion that meshes with the claw portion of the clutch hub via an elastic member.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The straddled vehicle fluctuating load transmission component includes a base end portion fixed to the vehicle body frame, a main body portion extending outward from the vehicle body from the base end portion, and a front end of the main body portion. and a tip that is a free end;
have

Thus, the base end portion fixed to the vehicle body frame, the body portion extending outward from the vehicle body from the base end portion, and the free end positioned at the tip of the body portion are provided. A straddled vehicle fluctuating load transmission component having a tip is susceptible to fluctuating loads occurring in the straddled vehicle. On the other hand, by configuring the variable load transmission component for straddled vehicle as in each of the configurations described above, the variable load can be reduced. Therefore, each of the above-described configurations includes a straddled vehicle fluctuating load transmission component fixed to the vehicle body frame at a base end portion, a main body portion extending outward from the vehicle body from the base end portion, It is particularly useful for a configuration having a free end positioned at the tip of the main body.

According to another aspect, it is preferable that the fluctuating load transmission component for straddled vehicles of the present invention includes the following configuration. The fibers contained in the fiber reinforced resin are arranged in the fiber reinforced resin so as to extend in a projecting direction from the mounting portion with the vehicle body frame.

Thus, the base end portion fixed to the vehicle body frame, the body portion extending outward from the vehicle body from the base end portion, and the free end positioned at the tip of the body portion are provided. A straddled vehicle fluctuating load transmission component having a front end portion is required to have strength from a fixed portion to the vehicle body frame portion toward the front end portion. That is, a base end portion fixed to the vehicle body frame, a main body portion extending from the base end portion toward the outside of the vehicle body, and a free end positioned at the tip of the main body portion. The strength can be increased by arranging the fibers contained in the variable load transmission component for straddled vehicles having and arranging from the proximal end to the distal end or from the distal end to the proximal end.

According to another aspect, the variable load transmission component for a straddled vehicle of the present invention includes a bracket or footrest attached to the rear arm, the drive source, or the vehicle body frame, or a power transmission path between the drive source and the rear wheel. A clutch hub or wheel hub provided in the

According to another aspect of the present invention, a disk-shaped main body portion having a through hole through which an axle penetrates; an annular rib; a claw portion provided on a second surface of the main body portion so as to radially extend in a radial direction; A clutch hub injection molding method for injection molding a clutch hub provided with a metal fastening member for fixing a connected rear wheel sprocket using a molding die. In the injection molding method, in the cavity of the mold, from a gate positioned radially outward of the main body portion with respect to the metallic fastening member, from a gate positioned radially inwardly with respect to the metallic fastening member A molten resin containing fibers of a predetermined length which are independent of each other is injected toward the substrate.

By injection-molding the clutch hub in this manner, cutting work can be reduced, and the clutch hub can be easily manufactured. In addition, by using a fiber reinforced resin as the molten resin, it is possible to reduce the weight of the fluctuating load transmission component for straddled vehicles, ensure rigidity, and absorb fluctuating loads.

Also, since the metal fastening member is arranged near the gate, the injected resin is dispersed. Further, since the molten resin is injected from the base of the claw to the tip of the claw, the fibers in the molten resin extend in the projection direction of the claw, thereby improving the strength of the clutch hub.

The terminology used herein is for the purpose of defining particular embodiments only and is not intended to limit the invention by the terminology.

As used herein, "and/or" includes all combinations of one or more of the associated listed constructs.

As used herein, the use of "including," "comprising," or "having," and variations thereof, refers to the features, steps, elements, components, and/or , may include one or more of the steps, acts, elements, components and/or groups thereof, although specifying the presence of equivalents thereof.

As used herein, "attached," "connected," "coupled," and/or equivalents thereof are used broadly and include "direct and indirect" attachment, It includes both connection and coupling. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connections or couplings, but can include direct or indirect connections or couplings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms defined in commonly used dictionaries are to be construed to have a meaning consistent with their meaning in the context of the relevant art and this disclosure, unless explicitly defined herein. , is not to be interpreted in an idealized or overly formal sense.

In describing the present invention, it is understood that a number of techniques and processes are disclosed. Each of these has individual benefits and can also be used in conjunction with one or more, or possibly all, of the other disclosed techniques.

Therefore, for the sake of clarity, the description of the invention refrains from unnecessarily repeating all possible combinations of the individual steps. However, the specification and claims should be read with the understanding that all such combinations are within the scope of the present invention.

Embodiments of injection molding methods for straddled vehicle fluctuating load transmission components, straddled vehicles, and clutch hubs according to the present invention are described herein.

In the following description, numerous specific examples are set forth to provide a thorough understanding of the invention. However, it will be obvious to one skilled in the art that the invention may be practiced without these specific examples.

Accordingly, the following disclosure should be considered illustrative of the invention and is not intended to limit the invention to the specific embodiments illustrated by the following drawings or description.

[Straddle vehicle]
In this specification, a straddled vehicle means a vehicle in which an occupant straddles the vehicle. Straddled vehicles include, for example, motorcycles, tricycles, quadricycles, and the like.

[Fiber reinforced resin]
As used herein, fiber-reinforced resin means fiber-reinforced resin in which resin is reinforced with fibers.

[Variable load transmission parts]
As used herein, a variable load transmission component means a component to which a variable load is transmitted. The variable load transmission component includes a rear arm, a bracket or footrest attached to the drive source or the body frame, or a clutch hub or wheel hub provided in the power transmission path between the drive source and the rear wheels.

According to an injection molding method for a straddled vehicle fluctuating load transmission component, a straddled vehicle including the straddled vehicle, and a clutch hub according to an embodiment of the present invention, it is possible to further reduce weight while ensuring rigidity. A straddled vehicle fluctuating load transmission component and a straddled vehicle having the same can be obtained, which can also obtain a reduction effect on fluctuating loads input from, for example, a straddled vehicle.

FIG. 1 is a side view of a vehicle according to an embodiment of the invention. FIG. 2 is a perspective view showing a schematic configuration of the main frame. FIG. 3 is a perspective view showing a schematic configuration of the rear frame. FIG. 4 is a perspective view showing a schematic configuration of a rear wheel. FIG. 5 is a partially enlarged perspective view showing the configuration of the wheel hub provided on the rear wheel. FIG. 6 is a perspective view showing the configuration of the hub damper. FIG. 7 is a perspective view of the configuration of the clutch hub as viewed in the direction of the first surface. FIG. 8 is a perspective view of the configuration of the clutch hub as viewed in the direction of the second surface. 9 is a cross-sectional view taken along line IV-IV of FIG. 7. FIG. FIG. 10 is a perspective view showing the configuration of the footrest bracket and footrest for the driver. FIG. 11 is a perspective view showing the configuration of a footrest bracket for a fellow passenger. FIG. 12 is a diagram showing the overall configuration of the vehicle and the schematic configuration of the clutch hub.

Each embodiment will be described below with reference to the drawings. In each figure, the same parts are denoted by the same reference numerals, and the description of the same parts will not be repeated. Note that the dimensions of the constituent members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratios of the respective constituent members, and the like.

Hereinafter, an arrow F in the drawings indicates the forward direction of the vehicle. An arrow U in the figure indicates the upward direction of the vehicle. An arrow R in the figure indicates the right direction of the vehicle. An arrow L in the figure indicates the left direction of the vehicle. Further, the front, rear, left, and right directions respectively mean the front, rear, left, and right directions as seen from the driver of the vehicle.

The present inventors have studied the configuration of a variable load component for a straddled vehicle that can reduce the weight while ensuring rigidity and alleviate the variation felt by the occupant of the straddled vehicle.

The inventors of the present invention have found in the course of their studies that the use of a resin material makes it possible to reduce the weight of variable load components for straddled vehicles to which variable loads are transmitted.

When the variable load parts for straddled vehicles are made of a resin material as described above, the weight can be reduced compared to when they are made of metal parts. It is necessary to increase the thickness of the resin to some extent. However, due to restrictions on the thickness of the resin, etc., it may not be possible to replace the variable load parts for straddled vehicles with resin materials. Therefore, there is a possibility that the variable load component for straddled vehicles cannot be sufficiently reduced in weight.

As a result of further studies, the present inventors have found that by using a fiber-reinforced resin material in which the resin is reinforced with fibers, it is possible to reduce the weight of the variable load component for a straddled vehicle to which a variable load is input while ensuring rigidity. , it was found that the load fluctuations felt by the occupant of the straddled vehicle can be alleviated by alleviating input load fluctuations or output load fluctuations. The present inventors have conceived the present invention based on the above findings. Embodiments of the present invention will be described below.

<Overall composition>
FIG. 1 is a side view showing an outline of the overall configuration of a vehicle 1 according to the embodiment. A schematic configuration of the vehicle 1 will be described with reference to FIG.

The vehicle 1 is, for example, a motorcycle, and includes a vehicle body 2, front wheels 3, and rear wheels 4. As shown in FIG. In this embodiment, the vehicle 1 is a straddled vehicle that is ridden by an occupant.

The vehicle body 2 includes a vehicle body cover 5 , a bar handle 6 , a front seat 7 a , a tandem seat 7 b , a power unit 8 and a vehicle body frame 10 . The body frame 10 supports components such as the body cover 5, the bar handle 6, the front seat 7a, the tandem seat 7b, and the power unit 8. As shown in FIG.

The power unit 8 includes an engine 8a. In this embodiment, the vehicle body 2 is a structure including a vehicle body frame 10 and a rear arm 14 and supporting each component of the vehicle 1 .

The rear arm 14 supports the rear wheel 4 with respect to the vehicle body frame 10 . A front portion of the rear arm 14 is connected to a main frame 12 (described later) of the body frame 10 so as to be vertically rotatable. A detailed configuration of the rear wheel 4 will be described later.

The front wheel 3 is rotatably supported by a pair of front forks 9 supported by the vehicle body 2 .

The vehicle body frame 10 has a head pipe 11 , a main frame 12 and a rear frame 13 . The vehicle body frame 10 is covered with a vehicle body cover 5 .

As shown in FIGS. 1 and 2, the head pipe 11 is positioned at the front of the vehicle 1 and rotatably supports a steering shaft 6a connected to the bar handle 6. As shown in FIGS. The head pipe 11 is connected to the front portion of the main frame 12 .

<Mainframe>
FIG. 2 is a top view showing an outline of the overall configuration of the vehicle 1. FIG. As shown in FIG. 2, the main frame 12 is connected to the head pipe 11 and extends from the head pipe 11 toward the rear of the vehicle. The main frame 12 supports the power unit 8 and the like.

The mainframe 12 has a left mainframe 20 and a right mainframe 30 . The left main frame 20 and the right main frame 30 are each formed in a plate shape extending in the vehicle front-rear direction.

Specifically, in this embodiment, the left main frame 20 includes a left main frame front portion 21 extending rearward and downward from the head pipe 11 and a left main frame front portion 21 extending downward from the rear end portion of the left main frame front portion 21 . a mainframe rear portion 22; The right main frame 30 includes a right main frame front portion 31 extending rearward and downward from the head pipe 11 and a right main frame rear portion 32 extending downward from the rear end portion of the right main frame front portion 31 . have.

Front ends of the left main frame 20 and the right main frame 30 are connected to the head pipe 11 respectively. That is, the front end portion of the left main frame front portion 21 of the left main frame 20 and the front end portion of the right main frame front portion 31 of the right main frame 30 are connected.

A rear end portion of the left main frame rear portion 22 of the left main frame 20 and a rear end portion of the right main frame rear portion 32 of the right main frame 30 are connected by a cross member 17 extending in the horizontal direction.

The main frame 12 has a left suspension support portion 25 and a right suspension support portion 35 extending rearward and upward from the left main frame 20 and the right main frame 30, respectively, between the front end portion and the rear end portion in the front-rear direction. have.

A rear arm 14 is rotatably supported by the left main frame rear portion 22 and the right main frame rear portion 32 . That is, the front portion of the rear arm 14 is rotatably connected to the rear portions of the left main frame 20 and the right main frame 30 .

A footrest bracket 41 for the driver is attached to each of the left main frame rear portion 22 and the right main frame rear portion 32 (see FIG. 1). The footrest bracket 41 is provided with a foldable footrest 42 on which the driver's feet are placed. A plate-shaped heel guard 43 is connected to the footrest bracket 41 . The heel guard 43 prevents the driver's feet from directly contacting the engine or the like. Detailed configurations of the footrest bracket 41 and the footrest 42 for the driver will be described later.

As shown in FIG. 2, the left main frame 20 has a rear frame mounting portion 20a for mounting the rear frame 13, a rear arm mounting portion 20b for mounting the rear arm 14, and a power unit mounting portion 20c for mounting the power unit 8. is provided. The right main frame 30 is provided with a rear frame mounting portion 30a for mounting the rear frame 13, a rear arm mounting portion 30b for mounting the rear arm 14, and a power unit mounting portion 30c for mounting the power unit 8 thereon.

In this embodiment, the main frame 12 may be made of a metal material, or may be made of a fiber-reinforced resin in which resin is reinforced with fibers such as carbon fibers. Moreover, when the fiber-reinforced resin is used for the main frame 12, at least a part thereof may be made of the fiber-reinforced resin.

The carbon fibers may be continuous fibers or discontinuous fibers having a fiber length equal to or longer than a predetermined length. Also, continuous and discontinuous fibers may be used.

<Rear frame>
A rear frame 13 (straddle vehicle variable load transmission component) is connected to the rear portion of the main frame 12 . Specifically, the rear frame 13 is connected to the left main frame rear portion 22 and the right main frame rear portion 32 . As described above, the power unit 8 including the engine 8 a is fixed to the main frame 12 , so vibrations and fluctuating loads of the engine 8 a are transmitted to the rear frame 13 via the main frame 12 .

FIG. 3 is a perspective view showing a schematic configuration of the rear frame 13. As shown in FIG. Rear frame 13 has a shape extending in the front-rear direction of vehicle 1 . The rear frame 13 has a left rear frame 51 , a right rear frame 52 , a first cross portion 53 and a second cross portion 54 . The left rear frame 51 and the right rear frame 52 are each formed like a wall extending in the vertical direction and the front-rear direction. The left rear frame 51 and the right rear frame 52 are arranged side by side in parallel in the left-right direction. The left rear frame 51 and right rear frame 52 are connected at their rear portions.

The first cross portion 53 connects the left rear frame 51 and the right rear frame 52 at their front and lower portions. The second cross portion 54 connects the left rear frame 51 and the right rear frame 52 at their central and lower portions in the front-rear direction. That is, the first cross portion 53 and the second cross portion 54 each extend in the left-right direction.

The front connecting portion 55 of the left rear frame 51 is connected to the left main frame rear portion 22 by fastening members (not shown) such as bolts. A front connecting portion 56 of the right rear frame 52 is connected to the right main frame rear portion 32 by a fastening member (not shown) such as a bolt. The connection structure between the left rear frame 51 and the left main frame rear part 22 and the connection structure between the right rear frame 52 and the right main frame rear part 32 are omitted.

The left rear frame 51, the right rear frame 52, the first cross portion 53 and the second cross portion 54 may be integrally formed, or may be formed separately and fixed to each other by fastening members or adhesives. may be connected.

A front seat 7a and a tandem seat 7b on which passengers are seated are attached to the left rear frame 51 and the right rear frame 52, respectively. The front seat 7a is used by the driver, and the tandem seat 7b is used by a fellow passenger.

A footrest bracket 41a for a fellow passenger seated on the tandem seat 7b is attached to each of the left rear frame 51 and the right rear frame 52 (see FIG. 1). The footrest bracket 41a is provided with a foldable footrest 42a on which the fellow passenger rests his or her feet. The detailed configurations of the passenger footrest bracket 41a and the footrest 42a will be described later.

In this embodiment, the rear frame 13 is made of a fiber-reinforced resin that is reinforced with fibers such as carbon fibers. A part of the rear frame 13 may be made of the fiber-reinforced resin.

The resin is preferably, for example, a thermoplastic resin such as polypropylene, polyamide, or polyphenylene sulfide, or a thermosetting resin such as epoxy resin, vinyl ester, or phenol resin.

Further, the carbon fibers may be woven together, or may be in a non-woven state. The carbon fibers may be continuous fibers independent of each other and having a predetermined length (for example, 1 mm) or longer, or may be discontinuous fibers. Sheets of continuous fibers and discontinuous fibers may be used as the carbon fibers.

Therefore, since the rear frame 13 is made of carbon fiber reinforced resin, it is possible to further reduce the weight of the rear frame 13 as compared to metal materials while ensuring rigidity, and obtain the effect of reducing engine vibrations transmitted from the engine 8a. be done.

<Rear wheel>
FIG. 4 is an exploded perspective view showing a schematic configuration of the rear wheel 4. As shown in FIG. The rear wheel 4 includes a rear wheel unit 70 rotatably attached to the rear arm 14 and a rubber tire 71 . The rear wheel unit 70 includes a rear wheel 72 , a wheel hub 73 integrated with the rear wheel 72 , a hub damper 74 , a clutch hub 75 and a rear wheel sprocket 76 .

The rear wheel 72 is made of an aluminum alloy and has a rubber tire 71 mounted on its outer periphery. The rear wheel 72 has a wheel hub 73 in its central portion. The wheel hub 73 is provided with a through hole 73d through which an axle (not shown) is inserted.

FIG. 5 is a partially enlarged perspective view showing the configuration of a wheel hub 73 (straddle vehicle fluctuating load transmission component) provided on the rear wheel 72. As shown in FIG. In this embodiment, the wheel hub 73 is configured as an injection molded product using carbon fiber resin reinforced with carbon fiber. A wheel hub 73 is fixed to the rear wheel 72 . The wheel hub 73 includes an annular inner wall 73a and an outer wall 73b arranged concentrically with the through hole 73d, and a plurality of claws 73c arranged between the inner wall 73a and the outer wall 73b and extending in the radial direction.

As shown in FIG. 6, the hub damper 74, which is an elastic member, is made of rubber and includes two blocks 74a and 74b and a connecting portion 74c connecting these blocks 74a and 74b. The hub damper 74 is attached to the wheel hub 73 so that the claw portion 73c of the wheel hub 73 is positioned between two adjacent blocks 74a and 74b.

7 and 8 are perspective views showing the configuration of the clutch hub. The clutch hub 75 (fluctuating load transmission component for straddled vehicle) includes an annular body portion 75a having a through hole 78 through which an axle 78a penetrates in the center, and a second surface 75k of the body portion 75a. and a fastening member 75c (metal fastening member) embedded so as to be exposed on the first surface 75j of the body portion 75a.

The fastening member 75c has a fixing hole 75d extending along the axle M direction as shown in FIG. As shown in FIG. 4, the clutch hub 75 is attached so that the pawl portion 75b is positioned between two adjacent blocks 74a and 74b of the hub damper 74. As shown in FIG. A claw portion 75 b of the clutch hub 75 meshes with a claw portion 73 c of the wheel hub 73 via the hub damper 74 .

The body portion 75a has an inner annular rib 75h and an outer annular rib 75i concentrically arranged on the first surface 75j. The inner surface of the inner annular rib 75h forms a through hole 78. As shown in FIG. Between the inner annular rib 75h and the outer annular rib 75i, six radially extending reinforcing ribs 75f are evenly arranged in the circumferential direction. The height of the reinforcing rib 75f with respect to the first surface 75j is lower than the heights of the inner annular rib 75h and the outer annular rib 75i.

A fastening member mounting portion 75g that holds the fastening member 75c protrudes radially outward from the outer peripheral surface of the outer annular rib 75i.

The fastening member mounting portion 75g is provided on the first surface 75j of the main body portion 75a, and is positioned on the second surface 75k of the main body portion 75a in the circumferential direction of the clutch hub 75 when the first surface 75j is viewed in the normal direction. It is located at an intermediate position between two provided adjacent claw portions 75b.

The pawl portion 75b is located in a gap 74d formed between two adjacent hub dampers 74 in a state where the clutch hub 75 is assembled to the wheel hub 73 . As a result, the claws 75 b of the clutch hub 75 can transmit force to the claw portions 73 c of the wheel hub 73 via the hub dampers 74 .

The fastening member 75c is made of an aluminum alloy and is embedded so as to be exposed on the first surface 75j of the fastening member mounting portion 75g. A rear wheel sprocket 76 is fixed to the fixing hole 75d using a screw (not shown). The driving force of the engine 8a is transmitted to the clutch hub 75 from the fastening member mounting portion 75g to which the rear wheel sprocket 76 is fixed. A fastening member attachment portion 75g of the clutch hub 75 is a variable load input portion.

The rear wheel sprocket 76 is connected to a drive chain 77 as shown in FIG. 4 to transmit the driving force of the engine 8a to the clutch hub 75. As described above, the pawl portion 75b of the clutch hub 75 can transmit force to the pawl portion 73c of the wheel hub 73 via the hub damper 74. Therefore, the driving force transmitted to the clutch hub 75 is transmitted to the wheel hub 73 and the wheel hub. 73 is transmitted to the connected rear wheel 72 . That is, the load that fluctuates due to torque fluctuations of the engine 8 a is transmitted to the clutch hub 75 and the wheel hub 73 .

As described above, the pawl portion 75b of the clutch hub 75 transmits force to the pawl portion 73c of the wheel hub 73 via the hub damper 74. As shown in FIG. A claw portion 75b of the clutch hub 75 is a variable load output portion. The internal annular rib 75h, the external annular rib 75i, and the reinforcing rib 75f, which constitute the main body portion 75a, are fluctuating load transmitting portions.

As described above, the fastening member attachment portion 75g is formed on the first surface 75j of the main body portion 75a, and the fastening member attachment portion 75g extends in the circumferential direction of the clutch hub 75 when the first surface 75j is viewed in the normal direction. It is located at an intermediate position between two adjacent claw portions 75b provided on the second surface 75k of the body portion 75a. Thus, the fastening member mounting portion 75g is provided on the first surface 75j, and the claw portion 75b is provided on the second surface 75k. As a result, the fastening member mounting portion 75g and the claw portion 75b are separated from each other in the axial direction of the clutch hub 75, which is different from the tangential direction of the clutch hub 75, which is the input direction of the fluctuating load input to the fastening member mounting portion 75g. located in position.

A claw portion 73c of the wheel hub 73 is a variable load input portion, a portion of the wheel hub 73 fixed to the rear wheel 72 is a variable load output portion, and an inner wall 73a and an outer wall 73b are variable load transmission portions.

Here, part of the load that fluctuates due to engine torque fluctuation that occurs during acceleration, deceleration, etc., is reduced by the hub damper 74 interposed between the clutch hub 75 and the wheel hub 73 . On the other hand, as will be described later, by forming the clutch hub 75 and the wheel hub 73 from carbon fiber resin reinforced with carbon fiber, the clutch hub 75 and the wheel hub 73 can absorb fluctuating loads. can be done. Therefore, part of the fluctuating load is absorbed by the clutch hub 75 and the wheel hub 73, thereby alleviating torque fluctuations felt by the occupant.

Furthermore, the fastening member mounting portion 75g and the pawl portion 75b are positioned apart from each other in the axial direction of the clutch hub 75, which is different from the tangential direction of the clutch hub 75, which is the input direction of the fluctuating load input to the fastening member mounting portion 75g. Located in As a result, a tensile force acts on the variable load transmission portion (the inner wall 73a and the outer wall 73b). Since the fiber reinforced resin has strength against tensile force, the tensile force slightly deforms the variable load transmitting portion (the inner wall 73a and the outer wall 73b). Due to this deformation, fluctuations in the load input to the fastening member attachment portion 75g can be mitigated.

In this embodiment, the clutch hub 75 and the wheel hub 73 are made of carbon fiber resin reinforced with carbon fiber, so that the rigidity required for the clutch hub 75 and the wheel hub 73 can be ensured. , to realize the absorption of fluctuating loads.

The carbon fiber reinforced resin forming the clutch hub 75 and the wheel hub 73 will be described by taking the clutch hub 75 as an example.

As shown in FIG. 7, the clutch hub 75 has a structure in which a metallic fastening member 75c is embedded in a fastening member mounting portion 75g of a body portion 75a using carbon fiber reinforced resin in which the resin is reinforced with carbon fiber. have The carbon fiber reinforced resin that constitutes the body portion 75a and the claw portion 75b includes carbon fibers that are independent of each other and have a predetermined length of about 1 cm.

The resin is preferably, for example, a thermoplastic resin such as polypropylene, polyamide, or polyphenylene sulfide, or a thermosetting resin such as epoxy resin, vinyl ester, or phenol resin.

The above materials are excellent in heat resistance and chemical resistance, have good dimensional stability, and can make it possible to reduce the weight while ensuring the rigidity of the clutch hub 75 and the wheel hub 73 . In addition, by absorbing the fluctuating load input to the clutch hub 75 and the wheel hub 73, it is possible to alleviate torque fluctuations felt by the occupant.

<Clutch hub manufacturing method>
Injection molding is used for molding the clutch hub 75 according to the present embodiment. Specifically, the molten resin containing the carbon fiber is injected into the mold while the fastening member 75c is placed in the mold (not shown). As a result, the strength of the fastening member can be ensured, and it is possible to prevent the fastening member from falling off from the main body.

Although not shown, the mold used for injection molding has six gates for injecting molten resin from six locations on the outer peripheral surface of the fastening member 75c. These gates are positioned radially outward with respect to the fastening member 75 c of the clutch hub 75 . Therefore, the flow of the molten resin injected into the mold from the gate is dispersed by the fastening member 75c.

This suppresses the occurrence of a weld at the outer periphery of the main body portion 75a and the base of the claw portion 75b. Further, since the molten resin flows from the base of the claw portion 75b to the tip of the claw portion 75b, the fibers can be arranged so as to extend in the projecting direction of the claw portion 75b as indicated by the arrow 150 in FIG. Therefore, the strength of the claw portion 75b can be ensured.

A gate mark 75e is formed in the portion of the clutch hub 75 where the gate of the mold is positioned.

Injection-molded articles using the above materials are excellent in heat resistance and chemical resistance, and have good dimensional stability, so that cutting processes after molding can be reduced. Therefore, the clutch hub 75 and the wheel hub 73 can be easily manufactured.

<Footrest bracket>
A driver footrest bracket 41 (straddle vehicle variable load transmission component) and a fellow passenger footrest bracket 41a (straddle vehicle variable load transmission component) are connected to the main frame 12 and the rear frame 13, respectively. . Since the power unit 8 including the engine 8a is fixed to the main frame 12, vibrations and fluctuating loads of the engine 8a are applied to the footrest bracket 41 and the footrest bracket 41a connected to the main frame 12 and the rear frame 13, respectively. is also transmitted.

As shown in FIG. 10, the footrest bracket 41 has a bracket main body 80 whose longitudinal ends are divided into two, and attachment portions 81 to the main frame 12 are provided at the ends of the respective ends. That is, the footrest bracket 41 has the mounting portion 81 fixed to the main frame 12 . The mounting portion 81 is a base end portion, and a main body portion (body portion) of the bracket body 80 extends from the mounting portion 81 toward the outside of the vehicle body 2 in the footrest bracket 41 . The tip portion located at the tip of the bracket body 80 is the free end.

A plate-like heel guard 43 mounting portion 82 for connecting the plate-like heel guard 43 (see FIG. 1) is provided above the bracket body 80 .

A footrest attachment portion 83 (tip portion) for fixing the footrest 42 in a foldable manner is provided at the tip portion of the bracket body 80 extending outward from the vehicle body 2 from the attachment portion 81 of the bracket body 80 . A pin insertion hole 84 is provided in the footrest mounting portion 83 . The footrest bracket 41 and the footrest 42 are connected by inserting the connecting pin 87 into the pin insertion hole 84 of the footrest mounting portion 83 and the through hole 85 of the footrest 42 .

In the footrest bracket 41, the attachment portion 81 of the bracket main body 80 is the fluctuating load input portion, the footrest attachment portion 83 is the fluctuating load output portion, and the bracket main body 80 is the fluctuating load transmission portion. When the footrest 42 is attached to the footrest bracket 41, a varying load is applied from the footrest 42, so the footrest attachment portion 83 is a variable load input portion and the attachment portion 81 is a variable load output portion.

In the footrest bracket 41, the mounting portion 81 and the footrest mounting portion 83 are positioned apart from each other in a direction different from the input direction of the fluctuating load input to the fluctuating load input portion (the mounting portion 81 of the bracket body 80). As a result, a tensile force acts on the variable load transmission portion (bracket main body 80). Since the fiber reinforced resin has strength against tensile force, the variable load transmission portion (bracket main body 80) is slightly deformed by the tensile force. Due to this deformation, fluctuations in the load input to the attachment portion 81 of the bracket body 80 can be reduced.

In this embodiment, the footrest bracket 41 may be made of fiber-reinforced resin in which the resin is reinforced with fibers such as carbon fibers.

The carbon fibers may be discontinuous fibers independent of each other and having a fiber length equal to or longer than a predetermined length, or may be continuous fibers. Sheets of continuous and discontinuous fibers may also be used. The fibers are oriented toward the footrest mounting portion 83 provided at the tip of the bracket body 80 extending outward from the vehicle body 2 from the mounting portion 81 as indicated by the arrow 151 . Thereby, the footrest bracket 41 can have high strength in the direction where strength is required.

The resin is preferably, for example, a thermoplastic resin such as polypropylene, polyamide, or polyphenylene sulfide, or a thermosetting resin such as epoxy resin, vinyl ester, or phenol resin.

Since the above material has excellent heat resistance and chemical resistance and good dimensional stability, it is possible to reduce the cutting process after molding. Therefore, the footrest bracket 41 can be manufactured easily. By configuring the footrest bracket 41 with carbon fiber reinforced resin, it is possible to reduce the weight while ensuring the rigidity of the footrest bracket 41 . Further, by damping the vibration transmitted to the footrest bracket 41 at an early stage, the vibration can be reduced.

As shown in FIG. 11, the passenger footrest bracket 41a (straddle vehicle fluctuating load transmission component) has a bracket main body 90 at which the longitudinal end is divided into two, and the end of each of which is connected to the rear frame 13. A mounting portion 91 is provided. That is, the footrest bracket 41 a has the mounting portion 91 fixed to the rear frame 13 . This mounting portion 91 is the base end portion. A body portion (main body portion) of a bracket body 90 extends outward from the vehicle body 2 from the mounting portion 91 of the footrest bracket 41a. The tip portion located at the tip of the bracket body 90 is the free end.

A footrest mounting portion 92 (tip portion) for fixing a footrest 42a for a fellow passenger in a foldable manner is provided at the tip portion of the bracket body extending from the mounting portion 81 of the bracket body 80 toward the outside of the vehicle body 2. ing. A pin insertion hole 93 is provided in the footrest mounting portion 92 . The footrest bracket 41a and the footrest 42a are connected by inserting a pin (not shown) into the pin insertion hole 93 of the footrest mounting portion 92 and the through hole (not shown) of the footrest 42a.

In the footrest bracket 41a, the attachment portion 91 of the bracket main body 90 is the fluctuating load input portion, the footrest attachment portion 92 is the fluctuating load output portion, and the bracket main body 90 is the fluctuating load transmission portion. When the passenger's footrest 42a is attached to the footrest bracket 41a, a fluctuating load is applied from the footrest 42a. Therefore, the footrest mounting portion 92 is the fluctuating load input portion, and the mounting portion 91 is the fluctuating load output portion.

In the footrest bracket 41a, the mounting portion 91 and the footrest mounting portion 92 are positioned apart from each other in a direction different from the input direction of the fluctuating load input to the fluctuating load input portion (the mounting portion 91 of the bracket body 90). As a result, a tensile force acts on the variable load transmission portion (bracket main body 90). Since the fiber-reinforced resin has strength against tensile force, the tensile force slightly deforms the variable load transmitting portion (bracket main body 90). Due to this deformation, fluctuations in the load input to the attachment portion 91 of the bracket body 90 can be reduced.

In this embodiment, the footrest bracket 41a may be made of fiber-reinforced resin in which the resin is reinforced with fibers such as carbon fibers.

The carbon fibers may be discontinuous fibers independent of each other and having a fiber length equal to or longer than a predetermined length, or may be continuous fibers. Sheets of continuous and discontinuous fibers may also be used. In addition, the fibers are oriented toward a footrest attachment portion 92 provided at the tip portion of the bracket body 90 extending outward from the vehicle body 2 from the attachment portion 91 as indicated by an arrow 152 . Thereby, the footrest bracket 41a can have high strength in the direction where the strength is required.

The resin is preferably, for example, a thermoplastic resin such as polypropylene, polyamide, or polyphenylene sulfide, or a thermosetting resin such as epoxy resin, vinyl ester, or phenol resin.

Since the above material has excellent heat resistance and chemical resistance and good dimensional stability, it is possible to reduce the cutting process after molding. Therefore, the footrest bracket 41a can be manufactured easily. By configuring the footrest bracket 41a with carbon fiber reinforced resin, it is possible to reduce the weight while ensuring the rigidity of the footrest bracket 41a. Further, by damping the vibration transmitted to the footrest bracket 41a at an early stage, the vibration can be reduced.

<Footrest>
A driver's footrest 42 (straddle vehicle variable load transmission component) and a passenger's footrest 42a (straddle vehicle variable load transmission component) are attached to a footrest bracket 41 connected to the main frame 12 and the rear frame 13, respectively. is connected to the footrest bracket 41a connected to the . Since the power unit 8 including the engine 8a is fixed to the main frame 12, the vibration and fluctuating load of the engine 8a are also transmitted to these members indirectly connected to the main frame 12 and the rear frame 13. be done.

As shown in FIG. 10, the footrest 42 is a rod-shaped member, and has a through hole 85 for connection to the footrest bracket 41 at its longitudinal end. The footrest bracket 41 and the footrest 42 are connected by inserting the connecting pin 87 into the pin insertion hole 84 of the footrest mounting portion 83 and the through hole 85 of the footrest 42 . That is, the footrest 42 has a through hole 85 (base end portion) fixed to the through hole 85 of the footrest mounting portion 83 by a connecting pin 87, and the footrest body portion 120 (main body portion) extending outward from the vehicle body 2 from the through hole 85. ) is extended. The tip of the footrest main body 420 is a free end. The footrest body portion 420 is provided with a placement portion 421 on which the driver's feet are placed.

In the footrest 42, the through hole 85 is a variable load input portion, the mounting portion 421 is a variable load output portion, and the footrest body portion 420 is a variable load transmission portion. When a variable load is applied by the driver, the placement portion 421 is the variable load input portion, and the through hole 85 is the variable load output portion.

In the footrest 42, the through-hole 85 and the mounting portion 421 are positioned apart from each other in a direction different from the input direction of the fluctuating load input to the fluctuating load input portion (the through-hole 85 or the mounting portion 421). As a result, a tensile force acts on the variable load transmission portion (footrest body portion 420). Since the fiber reinforced resin has strength against tensile force, the tensile force slightly deforms the fluctuating load transmitting portion (footrest body portion 420). Due to this deformation, fluctuations in the load input to the through hole 85 or the mounting portion 421 can be reduced.

In this embodiment, the footrest 42 may be made of fiber-reinforced resin in which the resin is reinforced with fibers such as carbon fibers.

The carbon fibers may be continuous fibers or discontinuous fibers having a fiber length equal to or longer than a predetermined length. Also, continuous and discontinuous fibers may be used. Also, the fibers are oriented from the through hole 85 toward the other end as indicated by arrow 153 . Thereby, the footrest 42 can have strong strength in the direction where the strength is required.

When a varying load is applied to the free end of the footrest 42 , a tensile force acts on the footrest 42 up to the through hole 85 of the footrest 42 . The footrest 42 can be deformed by the tensile force by forming the footrest 42 with a carbon fiber reinforced resin having strength against the tensile force. This deformation can relax the load that fluctuates.

The resin is preferably, for example, a thermoplastic resin such as polypropylene, polyamide, or polyphenylene sulfide, or a thermosetting resin such as epoxy resin, vinyl ester, or phenol resin.

Since the above material has excellent heat resistance and chemical resistance and good dimensional stability, it is possible to reduce the cutting process after molding. Therefore, the footrest 42 can be manufactured easily. By configuring the footrest 42 with carbon fiber reinforced resin, it is possible to reduce the weight while ensuring the rigidity of the footrest 42 . Further, by damping the vibration transmitted to the footrest 42 at an early stage, the vibration can be reduced.

From the above, when carbon fiber reinforced resin is used for the variable load transmission parts for straddled vehicles to which the variable load is input from the engine, the carbon fiber reinforced resin has a higher damping ratio than the metal material, so the conventional configuration Absorbs and reduces fluctuating loads more than parts. As a result, the fluctuating load felt by the occupant can be alleviated. In addition, carbon fiber reinforced resin is reinforced with carbon fibers, and can be further reduced in weight while ensuring rigidity compared to metal materials.

Therefore, with the above configuration, it is possible to reduce the fluctuating load applied to the straddle vehicle fluctuating load transmission component and to reduce the weight of the straddle vehicle.

(Other embodiments)
Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, without being limited to the above-described embodiment, it is possible to modify the above-described embodiment as appropriate without departing from the spirit thereof.

In each of the above embodiments, the rear frame 13, the clutch hub 75, the wheel hub 73, the footrest brackets 41, 41a, and the footrests 42, 42a contain carbon fiber reinforced resin. However, if at least some of these components contain a carbon fiber reinforced resin in which the resin is reinforced with carbon fibers, other parts are made of other materials such as metals, resins, elastomers, and the like. may be

In the above embodiment, the rear frame 13, the clutch hub 75, the wheel hub 73, the footrest brackets 41, 41a, and the footrests 42, 42a are independent of each other and have a fiber length of about 1 cm as carbon fibers contained in the carbon fiber reinforced resin. are discontinuous fibers. However, the carbon fiber may also be a resin in which the resin is reinforced by a fiber sheet containing carbon fibers.

In the above embodiment, the rear frame 13, the clutch hub 75, the wheel hub 73, the footrest brackets 41, 41a, and the footrests 42, 42a have the carbon fiber reinforced resin layer 101a containing carbon fiber reinforced resin reinforced with carbon fiber. have. However, the rear frame 13, the clutch hub 75, the wheel hub 73, the footrest brackets 41, 41a, and the footrests 42, 42a are resin-reinforced with fibers other than carbon fibers (for example, aramid fibers, polyethylene fibers, glass fibers, etc.). It may also contain a fiber reinforced resin. In the above embodiment, the rear frame 13, clutch hub 75, wheel hub 73, footrest brackets 41, 41a, and footrests 42, 42a are made of resin such as epoxy resin, vinyl ester, phenol resin, polyamide, polypropylene, polyphenylene sulfide. It is configured. The resin may be any other type of resin as long as it can be reinforced by fibers.

1 vehicle (straddle vehicle)
2 Body 3 Front Wheel 4 Rear Wheel 5 Body Cover 6 Bar Handle 7a Front Seat 7b Tandem Seat 8 Power Unit 8a Engine 10 Body Frame 11 Head Pipe 12 Main Frame 13 Rear Frame 14 Rear Arms 41, 41a Footrest Brackets 42, 42a Footrest 73 Wheel Hub 73d Through hole 74 Hub damper (elastic member)
75 clutch hub 75a body portion 75b claw portion 75c fastening member (metal fastening member)
75d Fixing hole 75e Gate mark 75f Reinforcing rib 75g Fastening member mounting portion 75h Internal annular rib 75i External annular rib 76 Rear wheel sprocket 77 Drive chain 78 Through hole 78a Axle 87 Connecting pin

Claims (11)

a rear arm that supports the rear wheel;
A fluctuating load input unit for inputting a fluctuating load, among straddled vehicle components used in a straddled vehicle having a seat on which an occupant sits and a body frame that supports a drive source;
a fluctuating load output unit that outputs the fluctuating load;
a fluctuating load transmission section that transmits the fluctuating load input to the fluctuating load input section to the fluctuating load output section;
A variable load transmission component for a straddled vehicle comprising:
The straddle vehicle variable load transmission component is attached to any one of the rear arm, the drive source, or the vehicle body frame, or is provided in a power transmission path between the drive source and the rear wheel. ,
The fluctuating load input section and the fluctuating load output section are arranged at positions separated from each other in a direction different from the input direction of the fluctuating load input to the fluctuating load input section,
The fluctuating load input section, the fluctuating load transmission section, and the fluctuating load output section are integrally molded of fiber-reinforced resin,
The fiber is arranged in the fiber reinforced resin so as to extend along a transmission path through which the variable load input to the variable load input section is transmitted to the variable load output section. load transmission parts. The fluctuating load transmission component for a straddled vehicle according to claim 1,
The variable load transmission component for a straddled vehicle, wherein the fiber reinforced resin is a carbon fiber reinforced resin reinforced with carbon fibers. The fluctuating load transmission component for a straddled vehicle according to claim 1 or 2,
A variable load transmission component for a straddled vehicle, wherein said fibers are independent of each other and have a predetermined length. The variable load component for a straddled vehicle according to any one of claims 1 to 3,
A disk-shaped main body having a through hole through which the axle passes;
an annular rib protruding in the axial direction of the axle so as to surround the through hole on the first surface of the main body;
a claw portion provided on the second surface of the body portion so as to extend radially in a radial direction;
a metal fastening member that is embedded in the main body so as to be exposed on the first surface of the main body and fixes a rear wheel sprocket to which a drive chain is connected;
with
including a clutch hub,
The metal fastening member is the fluctuating load input section,
The claw portion is the fluctuating load output portion,
A variable load transmission component for a straddled vehicle, wherein the annular rib is the variable load transmission portion. The fluctuating load transmission component for straddled vehicles according to claim 4,
A fluctuating load transmission component for a straddled vehicle, wherein the fibers are arranged in the fiber-reinforced resin so as to extend in the projecting direction of the claw portion. The fluctuating load transmission component for a straddled vehicle according to claim 4 or 5,
comprising a pawl portion that meshes with the pawl portion of the clutch hub via an elastic member,
Fluctuating load transmission components for straddled vehicles, including wheel hubs. The fluctuating load transmission component for straddled vehicles according to any one of claims 1 to 3,
a base end fixed to the vehicle body frame;
a body portion extending outward from the base end portion of the vehicle body frame;
a free end positioned at the tip of the main body;
has
The distal end portion is the fluctuating load input portion, the base end portion is the fluctuating load output portion, and the body portion is the fluctuating load transmission portion.
or,
A fluctuating load transmission component for a straddled vehicle, wherein the base end portion is the fluctuating load input portion, the tip portion is the fluctuating load output portion, and the body portion is the fluctuating load transmission portion. The fluctuating load transmission component for straddled vehicles according to claim 7,
A variable load transmission component for a straddled vehicle, wherein the fibers are arranged in the fiber-reinforced resin so as to extend from the base end toward the tip end. The fluctuating load transmission component for straddled vehicles according to any one of claims 1 to 3,
The straddle vehicle variable load transmission component is a bracket or footrest attached to the rear arm, the drive source or the vehicle body frame, or a clutch hub or wheel hub provided in a power transmission path between the drive source and the rear wheel. A fluctuating load transmission component for straddled vehicles. A straddled vehicle comprising the straddled vehicle fluctuating load transmission component according to any one of claims 1 to 9. A disk-shaped main body having a through hole through which the axle passes;
an annular rib protruding in the axial direction of the axle so as to surround the through hole on the first surface of the main body;
a claw portion provided on the second surface of the body portion so as to extend radially in a radial direction;
a metal fastening member that is embedded in the main body so as to be exposed on the first surface of the main body and fixes a rear wheel sprocket to which a drive chain is connected;
A method of injection molding a clutch hub, comprising: injection molding a clutch hub using a mold,
independently of each other in the cavity of the mold from a gate located radially outward of the body with respect to the metallic fastening member toward radially inward with respect to the metallic fastening member; and injecting a molten resin containing fibers having a predetermined length, and arranging the fibers so as to extend from the base of the claw portion in the direction in which the claw portion protrudes .

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