JP7332021B2 - motorcycle seat rail - Google Patents

Description

The present invention relates to a seat rail for a motorcycle having two side members spaced apart in the width direction of the vehicle body of the motorcycle and having a front end of each side member attached to a main frame of the vehicle body. Regarding.

A motorcycle is provided with a seat rail for supporting a seat. Typically, the seat rail has two side members spaced apart across the width of the motorcycle body, with the front end of each side member attached to the main frame of the body. . Such seat rails are sometimes constructed using fiber-reinforced resin.

As an example of such a seat rail, a seat rail (rear frame) that supports a passenger seat is made of fiber-reinforced resin, and a main frame (front frame) that supports an engine is provided with a rear seat rail. Further, the seat rail has two left and right side walls, and each side wall has an insertion hole for inserting a bolt through the insertion hole. There is a seat rail in which the seat rail is fastened to a main frame with bolts (see, for example, Patent Literature 1).

WO2015/033425

When a motorcycle travels on a rough road or the like, a large load is applied to the seat rails by a passenger or a load. However, in the seat rail made of fiber-reinforced resin as in the above example, the resin may undergo creep deformation, so it is difficult to ensure sufficient axial force of the fastening element in order to prevent such creep deformation. . In such a state in which the axial force of the fastening element cannot be ensured, the seat rail and the main frame are likely to be displaced by an external force. Such misalignment may cause contact between the inner peripheral surface of the insertion hole in the fastening portion of the seat rail fastened to the main frame and the outer peripheral surface of the insertion portion of the fastening element such as the threaded portion of the bolt. As a result, this contact may cause local stress concentration around the fastened portion of the seat rail. Furthermore, such stress concentration may reduce the strength of the seat rail.

Therefore, in the seat rail of the motorcycle, it is desired to suppress the local stress concentration at the fastening portion of the seat rail fastened to the main frame. As a result, in seat rails for motorcycles, it is desired to efficiently improve the strength of the seat rails.

In order to solve the above-described problems, a seat rail for a motorcycle according to one aspect has two sides that are spaced apart in the width direction of the vehicle body of the motorcycle and that are configured using fiber reinforced resin. Each side member includes a body portion positioned outward in the width direction of the vehicle body, and a lower side projecting in the width direction of the vehicle body from a lower edge of the body portion in the vertical direction of the vehicle body. and a mounting element for mounting the side member to the main frame of the vehicle body. At least one lower flange portion of each side member is mounted with a bracket for supporting a pillion footrest, and the seat rail extends to connect the lower flange portions of the two side members. A side connecting member is provided, and a lower flange portion of each side member is positioned forwardly and rearwardly of the vehicle body, respectively. an inflection section connecting the forward and aft sections so as to lift them upwardly of the side member, the inflection section of the lower flange portion of each side member connecting the forward end of the side member and the at least one Among the two lower connecting members, it is arranged between the frontmost lower connecting member in the longitudinal direction of the vehicle body or the bracket.

In the seat rail of the motorcycle according to one aspect, it is possible to suppress local stress concentration at the fastening portion of the seat rail fastened to the main frame. As a result, in the seat rail of the motorcycle according to one aspect, the strength of the seat rail can be efficiently improved.

FIG. 1 is a side view schematically showing a motorcycle having seat rails according to this embodiment. FIG. 2 is a side view schematically showing the seat rail according to the present embodiment together with the main frame of the vehicle body with the main seat, pillion seat and battery mounted. FIG. 3 is a perspective view schematically showing a seat rail according to this embodiment with a main seat and a pillion seat mounted thereon. FIG. 4 is a front view schematically showing a seat rail according to this embodiment. FIG. 5 is a plan view schematically showing the seat rails according to this embodiment.

A seat rail according to this embodiment will be described using a motorcycle having such a seat rail. 1 to 3 and 5 used for explanation in this embodiment, arrow F indicates the front of the motorcycle body, and arrow R indicates the rear of the vehicle body. That is, the longitudinal direction of the vehicle body is indicated by arrows F and R. As shown in FIG. 3 to 5, the width direction of the vehicle body (hereinafter referred to as "width direction") is indicated by a double-headed arrow W. As shown in FIG. 1 to 4, arrow U indicates the upper side of the vehicle body, and arrow D indicates the lower side of the vehicle body. The vertical direction of the vehicle body is indicated by arrows U and D. As shown in FIG.

"Overview of seat rails for motorcycles"
An outline of the seat rail 10 of the motorcycle 1 will be described with reference to FIGS. 1 to 5. FIG. First, an outline of the motorcycle 1 will be described. As shown in FIG. 1, a motorcycle 1 includes a main frame 2 forming a vehicle body, a main seat 3 on which a rider (front seat occupant) (not shown) sits, and a pillion rider (rear seat occupant) (not shown). not shown) has a pillion seat 4 on which it sits, a pillion footrest 5, a bracket 6 for mounting the pillion footrest 5, and a battery 7 (indicated by dashed lines). Such a motorcycle 1 has a seat rail 10 according to this embodiment. A front end portion 10 a of the seat rail 10 is attached to the main frame 2 .

Next, the outline of the seat rail 10 will be described. As shown in FIGS. 2 to 5, the seat rail 10 has two side members 20 spaced apart in the width direction of the vehicle body. Each side member 20 is constructed using a fiber-reinforced resin. Each side member 20 has a body portion 21 located outside in the width direction of the vehicle body. Each side member 20 also has an upper flange portion 22 that protrudes in the width direction of the vehicle body from the upper edge of the body portion 21 in the vertical direction of the vehicle body.

As shown in FIGS. 1 and 2, a fastening element T configured as an attachment element for attaching the side member 20 to the main frame 2 is provided at a front end portion 20a of each side member 20 in the longitudinal direction of the vehicle body. is provided. The fastening element T consists of a bolt and a nut, and the bolt is screwed onto the nut. However, such attachment elements may be fastening elements other than fastening elements consisting of bolts and nuts, joining elements, attachment elements other than fastening elements and joining elements, and the like.

As shown in FIGS. 2-5, the seat rail 10 has at least one upper connecting member 30 extending to connect the upper flange portions 22 of the two side members 20. As shown in FIGS. 2 to 5 show the seat rail 10 having two upper connecting members 30 as an example. However, the invention is not so limited.

The upper flange portion 22 of each side member 20 has a forward section 22a and a rearward section 22b located toward the front and rear of the vehicle body, respectively. The upper flange portion 22 of each side member 20 also connects the front section 22a and the rear section 22b so that the rear section 22b of the upper flange section 22 is lifted higher than the front section 22a in the vertical direction of the vehicle body. has an inflection zone 22c.

The inflection area 22c of the upper flange portion 22 of each side member 20 is formed between the front end portion 20a of the side member 20 and the foremost upper connecting member 30 of at least one upper connecting member 30 in the longitudinal direction of the vehicle body. is placed between A front end portion 20a of each side member 20 is positioned at a front end portion 10a of the seat rail 10. As shown in FIG.

Further, the outline of the seat rail 10 according to this embodiment is preferably as follows. As shown in FIG. 4, the body portion 21 and upper flange portion 22 of each side member 20 intersect at an angle greater than approximately 90 degrees. As shown in FIGS. 2 to 5, each side member 20 has a lower flange portion 23 that protrudes in the width direction of the vehicle body from the lower edge of the body portion 21 of the side member 20 in the vertical direction of the vehicle body. . A bracket 6 that supports the pillion footrest 5 is attached to the lower flange portion 23 of each side member 20 .

As shown in FIGS. 2 , 4 and 5 , the seat rail 10 has at least one lower connecting member 40 extending to connect the lower flange portions 23 of the two side members 20 . 2 to 5 show the seat rail 10 having one lower connecting member 40 as an example. However, the invention is not so limited.

As shown in FIGS. 2-5, the lower flange portion 23 of each side member 20 has a front section 23a and a rear section 23b located toward the front and rear of the vehicle body, respectively. The lower flange portion 23 of each side member 20 also connects the front and rear sections 23a and 23b such that the rear section 23b of the lower flange section 23 is raised above the vehicle body relative to the front section 23a. It has an inflection area 23c.

As shown in FIGS. 2, 4 and 5, the inflection area 23c of the lower flange portion 23 of each side member 20 is such that the forwardmost lower connecting member 40 is attached to this lower flange portion 23. As shown in FIGS. When positioned behind the bracket 6 in the vehicle body, it is positioned between the front end 20 a of the side member 20 and the bracket 6 . However, the present invention is not limited to this, and the inflection area of the lower flange portion of each side member is located forward of the vehicle body from the bracket to which the foremost lower connecting member is attached to this lower flange portion. When located, it is located between the forward end of this side member and the forwardmost lower connecting member.

As shown in FIG. 4, the body portion 21 and the lower flange portion 23 of each side member 20 intersect at an angle of greater than approximately 90 degrees. As shown in FIG. 2, each of the upper and lower flange portions 22, 23 is provided with the fastening element T described above.

As shown in FIGS. 4 and 5, at least one of the upper and lower flange portions 22 and 23 of each side member 20 has a width in the width direction of the vehicle body that decreases from the front to the rear of the vehicle body. are doing. 4 and 5, the lengths in the vehicle width direction of the upper and lower flange portions 22 and 23 of the two side members 20 decrease from the front to the rear of the vehicle body. there is However, the invention is not so limited.

At least one of the at least one upper connecting member 30 and the at least one lower connecting member 40 is joined to the two side members 20 by welding. That is, at least one upper connecting member 30 is joined to the upper flange portions 22 of the two side members 20 by welding, and/or at least one lower connecting member 40 is joined to the two side members 20 by welding. It is joined to the lower flange portion 23 . As will be described later, when each side member 20 and at least one of the upper and lower connecting members 30 and 40 are configured using a fiber reinforced resin containing a thermoplastic resin, each side member 20 and the upper and at least one of the lower connecting members 30 and 40 can be joined by vibration welding, ultrasonic welding, or the like. However, the invention is not so limited. For example, each side member and at least one of the upper and lower connecting members can be integrally formed by injection molding or the like.

"Details of motorcycle seat rails"
Details of the seat rail 10 of the motorcycle 1 will be described with reference to FIGS. 1 to 5. FIG. Specifically, the seat rails 10 are preferably configured as follows. The upper and lower connecting members 30, 40 are constructed using fiber reinforced resin.

The fiber reinforced resin used for the side member 20 and the upper and lower connecting members 30 and 40 may be either continuous fiber reinforced resin or discontinuous fiber reinforced resin. The fiber-reinforced resin contains a predetermined resin material and a plurality of fibers. A thermoplastic resin or a thermosetting resin can be used as the resin material of the fiber-reinforced resin. Examples of thermoplastic resins that can be used include polyamide and polypropylene. As the thermosetting resin, for example, epoxy resin, phenol resin, or the like can be used. The fibers of the fiber-reinforced resin can be carbon fibers, glass fibers, aramid fibers, polyamide fibers, polyethylene fibers, and the like. However, the fiber-reinforced resin is not limited to these. Also, the fiber reinforced resin used for the side member 20 and the upper and lower connecting members 30, 40 may be the same or different.

As shown in FIGS. 2-5, the body portion 21 of each side member 20 has a front section 21a and a rear section 21b located respectively toward the front and rear of the vehicle body. The body portion 21 of each side member 20 also has an inflection section 21c connecting the front section 21a and the rear section 21b so as to lift the rear section 21b of the body section 21 above the front section 21a of the vehicle body. have. As shown in FIGS. 2 and 3, the length of the rear section 21b of the main body 21 in the vertical direction of the vehicle body decreases from the front toward the rear of the vehicle body.

As shown in FIGS. 2-5, the front section 21a of the body portion 21 of each side member 20 is located between the front sections 22a, 23a of the upper and lower flanges 22, 23 of that side member 20. . The rear section 21b of the body portion 21 of each side member 20 is located between the rear sections 22b, 23b of the upper and lower flange sections 22, 23 of this side member 20 . The inflection area 21c of the body portion 21 of each side member 20 is located between the inflection areas 22c, 23c of the upper and lower flange portions 22, 23 of this side member 20. As shown in FIG.

The upper flange portion 22 protrudes from the upper edge of the body portion 21 toward the center in the width direction of the vehicle body. The upper flange portion 22 is inclined from below to above the vehicle body as it goes from the outside to the center in the width direction of the vehicle body. The lower flange portion 23 protrudes from the lower edge of the body portion 21 toward the widthwise center of the vehicle body. The lower flange portion 23 is inclined from above to below the vehicle body as it extends from the outside toward the center in the width direction of the vehicle body.

Each front section 21a, 22a, 23a is arranged along the longitudinal direction of the vehicle body. Each rear section 21b, 22b, 23b extends rearwardly of the vehicle body from an inflection section 21c, 22c, 23c that connects the rear section 21b, 22b, 23b. Each of the rear sections 21b, 22b, 23b inclines from below to above the vehicle body as it goes from the front to the rear of the vehicle body. Each of the inflection zones 21c, 22c, 23c is formed with a bend. However, the invention is not limited to this and, for example, each inflection zone may be curved.

Both side end portions 30a of the upper connecting member 30 in the width direction of the vehicle body are inclined along the upper flange portions 22 of the two side members 20, respectively. Both side end portions 30a of the upper connecting member 30 are joined to the upper surfaces of the upper flange portions 22, respectively. As shown in FIGS. 2, 4 and 5, both side end portions 40a of the lower connecting member 40 in the width direction of the vehicle body are inclined along the lower flange portions 23 of the two side members 20. . Both side end portions 40a of such a lower connecting member 40 are joined to the upper surfaces of these upper flange portions 22, respectively.

As shown in FIG. 2 , the frontmost upper connecting member 30 supports the main seat 3 . The rearmost upper connecting member 30 in the longitudinal direction of the vehicle body supports the pillion seat 4 . Lower connecting member 40 supports battery 7 .

As shown in FIG. 2 , the rear end 2 a of the main frame 2 in the longitudinal direction of the vehicle body is located between the front ends 20 a of the two side members 20 . The rear end 2 a of the main frame 2 is attached to the front ends 20 a of the two side members 20 .

As shown in FIGS. 3 to 5, the front section 22a of the upper flange portion 22 is provided with an insertion hole 22d penetrating vertically through the vehicle body so that the bolt of the fastening element T can be inserted. A front section 23a of the lower flange portion 23 is provided with an insertion hole 23d penetrating in the vertical direction of the vehicle body so that the bolt of the fastening element T can be inserted. As shown in FIG. 2, a fastening element T is arranged on the front sections 22a, 23a of the upper and lower flanges 22, 23, respectively. Each fastening element T fastens the front sections 22a, 23a in which the fastening elements T are arranged and the portion of the main frame 2 to which the front sections 22a, 23a are attached in the vertical direction of the vehicle body.

As described above, in the seat rail 10 according to the present embodiment, typically the frontmost upper connecting member 30 supports the main seat 3 on which the rider sits. Therefore, a large downward load from the rider is applied to the forwardmost upper connecting member 30 . In this case, the stress concentrates in the area between the frontmost upper connecting member 30 and the front end 20a of each side member 20 to which the main frame 2 of the vehicle body is attached. On the other hand, since the inflection area 22c of the upper flange portion 22 of each side member 20 is arranged between the front end portion 20a of this side member 20 and the forwardmost upper connecting member 30, The stress can be dispersed in the inflection area 22c, and stress concentration can be suppressed at the fastening element T of the front end portion 20a of each side member 20 and its periphery. Therefore, local stress concentration at the fastening portion of the seat rail 10 fastened to the main frame 2 can be suppressed, and the strength of the seat rail 10 can be efficiently improved. The upper flange portion 22 and the upper connecting member 30 of each side member 20 can also be used to attach hooks, fender braces, etc. (not shown) for holding the main seat 3 or pillion seat 4 . Furthermore, the inflection area 22c of the upper flange portion 22 of each side member 20 can also be used for positioning when attaching the seat rail 10 to the main frame 2. As shown in FIG.

In the seat rail 10 according to this embodiment, the body portion 21 and the upper flange portion 22 of each side member 20 intersect at an angle of greater than approximately 90 degrees. Therefore, even if the side member 20 is made of CFRP (carbon fiber reinforced resin) and moisture adheres to the upper flange portion 22 of the side member 20, the moisture will flow downwards. Moisture can be prevented from accumulating in the side member 20, and corrosion of the side member 20 due to water can be prevented. As a result, the strength of the seat rail 10 can be efficiently improved.

In the seat rail 10 according to the present embodiment, the battery 7 is typically supported by the forwardmost lower connecting member 40, so that a large downward load from the battery 7 is applied to the forwardmost lower connecting member 40. be done. Also, a large downward load is typically applied to the pillion footrest 5 from the pillion rider. In such a case, stresses are concentrated in the area between the forwardmost lower connecting member 40 or pillion footrest 5 and the forward end 20a of each side member 20 to which the main frame 2 of the vehicle body is attached. In contrast, the inflection section 23c of the lower flange 23 of each side member 20 is arranged between the front end 20a of this side member 20 and the forwardmost lower connecting member 40. Therefore, the stress can be dispersed in the inflection area 23c, and stress concentration can be suppressed in the fastening element T of the front end portion 20a of each side member 20 and its periphery. Therefore, local stress concentration at the fastening portion of the seat rail 10 fastened to the main frame 2 can be suppressed, and the strength of the seat rail 10 can be efficiently improved. In addition, the inflection area 23 c of the lower flange portion 23 of each side member 20 can also be used for positioning when attaching the seat rail 10 to the main frame 2 .

In the seat rail 10 according to this embodiment, the body portion 21 and the lower flange portion 23 of each side member 20 intersect at an angle of greater than approximately 90 degrees. Therefore, even if the side member 20 is made of CFRP and water adheres to the lower flange portion 23 of the side member 20, the water flows downward, so that the side member 20 Moisture can be prevented from accumulating, and corrosion of the side member 20 due to the moisture can be prevented. As a result, the strength of the seat rail 10 can be efficiently improved.

In the seat rail 10 according to this embodiment, the fastening elements T are provided on each of the upper and lower flange portions 22 and 23 . Therefore, the mounting elements T of the upper and lower flange portions 22, 23 have high strength against vertical loads generated when the motorcycle 1 travels on rough roads, etc., so that the strength of the seat rails 10 can be effectively increased. can be improved.

In the seat rail 10 according to the present embodiment, the length in the vehicle width direction of at least one of the upper and lower flange portions 22 and 23 of each side member 20 increases from the front to the rear of the vehicle body. is decreasing. Since the need to increase the strength of the seat rail 10 increases from the rear to the front in the longitudinal direction of the vehicle body, the strength of the seat rail 10 is efficiently improved by at least one of the upper and lower flange portions 22 and 23. can be made

In the seat rail 10 according to this embodiment, at least one connecting member 30, 40 out of at least one upper connecting member 30 and at least one lower connecting member 40 is joined to two side members 20 by welding. ing. When the at least one connecting member 30, 40 and the two side members 20 are joined by welding, compared to the case where they are joined using an additional member such as a bolt. , the strength of the seat rail 10 can be efficiently improved while preventing an increase in the weight of the vehicle body.

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and the present invention can be modified and changed based on its technical ideas.

DESCRIPTION OF SYMBOLS 1... Motorcycle, 2... Main frame, 10... Seat rail, 20... Side member, 20a... Front end part, 21... Body part, 22... Upper flange part, 22a... Front area, 22b... Rear area 22c... Change Curved section 23 Lower flange portion 23a Front section 23b Rear section 23c Inflection section 30 Upper connecting member 40 Lower connecting member T Fastening element (mounting element)

Claims (5)

Two side members arranged with an interval in the width direction of the motorcycle body and constructed using fiber reinforced resin,
Each side member has a body portion positioned outward in the width direction of the vehicle body, and a lower flange portion projecting in the width direction of the vehicle body from a lower edge of the body portion in the vertical direction of the vehicle body. death,
A seat rail for a motorcycle, wherein a mounting element for mounting the side member to a main frame of the vehicle body is provided at a front end portion of each side member in the front-rear direction of the vehicle body,
A bracket supporting a pillion footrest is attached to the lower flange of each side member,
the seat rail comprises at least one lower connecting member extending to connect the lower flange portions of the two side members;
The lower flange portion of each side member has front and rear sections respectively positioned toward the front and rear sides of the vehicle body, and the rear section of the lower flange section is lifted above the vehicle body relative to the front section. and an inflection zone connecting the front and rear zones,
the inflection area of the lower flange portion of each side member is between the front end of the side member and the foremost lower connecting member of the at least one lower connecting member in the longitudinal direction of the vehicle body; or A seat rail of a motorcycle arranged between the bracket. A seat rail for a motorcycle according to claim 1, wherein the body portion and the lower flange portion of each side member intersect at an angle greater than 90 degrees. A seat rail for a motorcycle according to claim 1 or 2, wherein the mounting element is provided on the lower flange portion . 4. The length in the width direction of the vehicle body of at least one of the lower flange portions of the side members decreases from the front toward the rear of the vehicle body. The seat rail for the motorcycle described in . A seat rail for a motorcycle according to any one of claims 1 to 4, wherein at least one of said at least one lower connecting member is joined to said two side members by welding.

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