JP7155738B2 - Frame structure and scooter type motorcycle - Google Patents

Description

The present disclosure relates to a frame structure and a scooter type motorcycle.

BACKGROUND ART Conventionally, a scooter-type two-wheeled vehicle is known in which a footrest space is formed in front of a rider's seat by a leg shield and a step board (see, for example, Patent Document 1). The rear portion of the body frame of this scooter-type motorcycle has a pair of left and right rear frame members rising from the rear portion of the step board toward the rider seat. are connected so as to be able to swing vertically. An electric motor is built into the swing arm, and a rear wheel driven by the electric motor is supported on the rear side of the swing arm.

WO2011/033613

However, in the scooter-type motorcycle described in Patent Document 1, the front edge of the pivot bracket is welded to each rear frame member, and the cantilever pivot bracket has low support rigidity for the swing arm, resulting in good steering stability. There was a problem that it was not possible to obtain

The present disclosure has been made in view of this point, and an object of the present disclosure is to provide a frame structure and a scooter type two-wheeled vehicle that can increase the rigidity of the frame as a whole and obtain steering stability.

A frame structure according to one aspect of the present disclosure is a frame structure for a scooter-type motorcycle in which a footrest space is formed in front of a seat, and includes a pair of lower frame members extending in the front-rear direction of the vehicle below the footrest space; A pair of rear frame members standing from the lower frame member behind the footrest space, a pair of supporting frame members standing from the lower frame member behind the rear frame member, and a swing arm swinging up and down via a support shaft. a pair of pivot brackets movably connected; and a reinforcing frame integrally connecting the pair of rear frame members and the pair of support frame members , wherein the pivot brackets connect the rear frame members and the support frame. It is characterized in that a battery unit mounting space is provided above the reinforcement frame, and an electric power unit installation space is provided below the reinforcement frame .

According to the frame structure of one aspect of the present disclosure, the pivot bracket is supported by the rear frame member and the support frame member, so that the swing arm is supported more rigidly by the pivot bracket, resulting in good steering stability. be able to. Since the rear frame member and the support frame member are connected in the longitudinal direction via the pivot bracket, the rigidity of the rear frame member and the support frame member is enhanced. In addition, the cross-sectional area of the frame can be reduced by the increased rigidity of the entire frame structure, and a space can be secured between the frames.

1 is a perspective view of a scooter type two-wheeled vehicle from which an exterior member of the present embodiment is removed; FIG. It is the perspective view which looked at the frame structure of this Embodiment from diagonally forward. It is the perspective view which looked at the frame structure of this Embodiment from the downward direction. It is a top view of the frame structure of this embodiment.

Hereinafter, this embodiment will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a scooter-type two-wheeled vehicle with an exterior member removed according to the present embodiment. In the following figures, an arrow FR indicates the front of the vehicle, an arrow RE indicates the rear of the vehicle, L indicates the left side of the vehicle, and R indicates the right side of the vehicle.

As shown in FIG. 1, the scooter type motorcycle 1 has an underbone type body frame 10, and a head pipe 11 into which a steering shaft 41 is inserted is provided at the front end portion of the body frame 10. As shown in FIG. A front frame 12 extends downward from the head pipe 11, and a pair of lower frame members 13 constituting a lower frame extends rearward from the lower portion of the front frame 12. As shown in FIG. A pair of rear frame members 15 forming a rear frame rise obliquely rearward from midway positions of the pair of lower frame members 13, and a pair of support frame members forming a support frame rise from rear end positions of the pair of lower frame members 13. 18 rises obliquely rearward, and upper ends of the pair of support frame members 18 are connected to the pair of rear frame members 15 .

A steering shaft 41 is steerably supported by the head pipe 11 of the vehicle body frame 10 . A handle 42 is provided on the upper portion of the steering shaft 41 , and a front wheel 44 is attached to the lower portion of the steering shaft 41 via a pair of front forks 43 . Supported. A rider seat 46 and a pillion seat 47 are connected to the upper portion of the pair of rear frame members 15, and an installation space surrounded by the pair of rear frame members 15 and the pair of support frame members 18 is provided below the rider seat 46. formed. This installation space is vertically partitioned by reinforcing frames 21 that connect the pair of rear frame members 15 and the pair of support frame members 18 in the horizontal direction.

A battery unit 51 is installed above the installation space, and an electric power unit 52 is installed below the installation space. An inverter unit 53 that converts the DC power of the battery unit 51 into AC power is installed in front of the electric power unit 52 between a pair of lower frame members. By arranging the battery unit 51 and the electric power unit 52, which are heavy items, under the rider seat 46, the steering stability is measured. In addition, by bringing the inverter unit 53 close to the battery unit 51, the high-voltage line from the battery unit 51 to the inverter unit 53 is shortened to facilitate wiring.

The pair of rear frame members 15 and the pair of support frame members 18 are connected in the front-rear direction by a pair of pivot brackets 31, respectively. A swing arm 55 is connected to the pair of pivot brackets 31 so as to be vertically swingable, and a rear cushion unit 56 is attached between the body frame 10 and the swing arm 55 . The swing arm 55 is provided with a chain cover 57 in which a rear sprocket (not shown) and a chain (not shown) are stored, and the driving force of the electric power unit 52 is transmitted to the rear wheel 58 via the rear sprocket and chain. be done.

By the way, a general scooter-type two-wheeled vehicle employs a unit swing type in which the electric power unit can swing along with the rear wheel on the vehicle body frame. Due to the layout of the unit swing type, it is difficult to provide a support frame behind the rear frame. For this reason, the cross-sectional area of the rear frame members (pipes) that make up the rear frame is increased to ensure the strength and rigidity of the rear frame, and the swing arm is supported by a cantilevered pivot bracket on the rear frame. . With only the cantilever pivot bracket, the supporting rigidity of the swing arm is low, and good steering stability of the scooter type motorcycle cannot be obtained.

Therefore, in the present embodiment, instead of the unit swing type, the electric power unit 52 is mounted on the vehicle body frame 10 side, the pair of lower frame members 13 are extended rearward, and the pair of rear frame members 15 are mounted. A pair of support frame members 18 can be installed behind the . A pivot bracket 31 is bridged between the rear frame member 15 and the support frame member 18 to increase the rigidity of the rear frame member 15 and the support frame member 18 . Further, by connecting the swing arm 55 to the pivot bracket 31 supported on both sides, it is possible to secure the support rigidity of the swing arm 55 and obtain good steering stability.

The frame structure of the scooter-type two-wheeled vehicle will be described below with reference to FIGS. 2 to 4. FIG. FIG. 2 is a perspective view of the frame structure of the present embodiment as seen obliquely from the front. FIG. 3 is a perspective view of the frame structure of this embodiment as viewed from below. FIG. 4 is a top view of the frame structure of this embodiment. 2 to 4 omit configurations other than the electric power unit for convenience of explanation.

As shown in FIGS. 2 to 4, the body frame 10 has a frame structure in which a driver's footrest space is formed in front of the seat. A pair of lower frame members 13 extend to the side. A pair of lower frame members 13 are connected by a plurality of bridges 14 to form a lower frame. In the lower frame, the bridges 14 improve the rigidity of the pair of lower frame members 13 in the vehicle width direction. The footrest space is a space surrounded by a body cover (not shown), a leg shield (not shown), and a step board (not shown) below the seat, where the driver's feet are placed on the vehicle body. .

A pair of lower frame members 13 extend in the longitudinal direction of the vehicle, and a pair of rear frame members 15 rise from the pair of lower frame members 13 behind the footrest space. The pair of rear frame members 15 rise obliquely rearward from the lower frame member 13 and are partially curved so that the inclination becomes gentle in the middle of the extending direction. A pair of rear frame members 15 are connected by a plurality of bridges 16 to form a rear frame. In the rear frame, the bridges 16 improve the rigidity of the pair of rear frame members 15 in the vehicle width direction. A triangular reinforcing member 17 is provided at the lower ends of the pair of rear frame members 15 to increase the joint area between the rear frame member 15 and the lower frame member 13 .

A pair of support frame members 18 rise from the pair of lower frame members 13 behind the pair of rear frame members 15 . The pair of support frame members 18 rise obliquely rearward from the rear end positions of the pair of lower frame members 13 and are joined to the rear sides of the curved portions of the pair of rear frame members 15 . Upper ends of the pair of support frame members 18 are joined to lower surfaces of the pair of rear frame members 15 from below, and the seat load is supported by the pair of support frame members 18 together with the pair of rear frame members 15 . A rear cushion bracket 19 having a rhombic shape in a side view is provided at the joint between the rear frame member 15 and the support frame member 18 to increase the joint area between the rear frame member 15 and the support frame member 18 .

The rear cushion bracket 19 is connected to a swing arm 55 via a rear cushion unit 56 (FIG. 1). At this time, a push-up load acts on the rear cushion bracket 19 via the rear cushion unit 56 , but the push-up load acting on the rear cushion bracket 19 is distributed to the rear frame member 15 and the support frame member 18 . A pair of pivot brackets 31 are bridged over the pair of rear frame members 15 and the pair of support frame members 18, respectively. The pivot bracket 31 connects the rear frame member 15 and the support frame member 18 in the longitudinal direction to increase rigidity.

The pivot bracket 31 has a U-shaped groove 32 in cross section, and the extending direction of the groove 32 intersects the extending direction of the rear frame member 15 and the support frame member 18, thereby increasing the rigidity. It is A pivot hole 33 to which a swing arm 55 (see FIG. 1) is vertically swingably connected via a spindle is formed in the bottom surface of the groove shape 32 . The front end of the pivot bracket 31 is joined to the rear surface of the rear frame member 15 , and the rear end of the pivot bracket 31 is joined to the front surface of the support frame member 18 . In this case, the upper side of the rear end of the pivot bracket 31 widens rearward, and stress concentration acting on the upper side of the rear end of the pivot bracket 31 is alleviated.

In this manner, the pivot bracket 31 is supported by both ends of the rear frame member 15 and the support frame member 18, and the pivot bracket 31 itself is formed in a shape that is difficult to deform, so that the swing arm 55 is supported with increased rigidity. Improved steering stability. The rear side of the vehicle body frame 10 has a support structure using four frames, the rear frame member 15 and the support frame member 18, as pillars, but it is difficult to ensure torsional rigidity with only the four frames. Therefore, in the present embodiment, the pair of rear frame members 15 and the pair of support frame members 18 are integrally connected via the reinforcing frame 21 to increase the rigidity.

The reinforcing frame 21 is formed in a rectangular frame shape by a pair of front and rear frame portions 22 extending in the longitudinal direction of the vehicle and a pair of left and right frame portions 23 extending in the vehicle width direction. The pair of rear frame members 15 and the pair of support frame members 18 are provided with support brackets 25 at the same height positions, respectively, and the reinforcement frame 21 is fixed to the support brackets 25 at four points. By integrally connecting the pair of rear frame members 15 and the pair of support frame members 18 with the reinforcing frame 21 having a rectangular frame shape, the rigidity of the rear frame members 15 and the support frame members 18 in the longitudinal direction and the lateral direction is increased. and torsional rigidity is enhanced.

In the vehicle body frame 10 , an installation space surrounded by the rear frame member 15 and the support frame member 18 is vertically partitioned by the reinforcing frame 21 . The upper side of the installation space is an installation space for the battery unit 51 (see FIG. 1), and the battery unit 51 is placed on the rectangular upper surface of the reinforcing frame 21 . The frame dimensions of the reinforcing frame 21 correspond to the width and depth dimensions of the battery unit 51, and the lower surface of the battery unit 51 is supported by the reinforcing frame 21 over the entire circumference. Thus, the reinforcement frame 21 not only ensures the rigidity of the rear frame member 15 and the support frame member 18 but also functions as a mounting surface for the battery unit 51 .

The lower side of the installation space is an installation space for an electric power unit 52, and the electric power unit 52 is attached to the reinforcing frame 21 and the bridge 14 that constitutes the lower frame. An upper bracket 27 that supports the upper portion of the electric power unit 52 is provided on the left and right frame portions 23 on the front side of the reinforcing frame 21, and a lower bracket 28 that supports the lower portion of the electric power unit 52 is provided on the bridge 14 of the lower frame. Since the electric power unit 52 is supported by the upper bracket 27 and the lower bracket 28 , the overall rigidity of the vehicle body frame 10 is increased by the electric power unit 52 .

A battery unit 51 is mounted on the upper surface of the reinforcing frame 21 , and an electric power unit 52 is supported below the reinforcing frame 21 . Therefore, by vertically arranging the heavy battery unit 51 and the electric power unit 52, it is possible to obtain steering stability by centralizing the mass. Further, the reinforcing frame 21 is detachably connected to the support brackets 25 of the pair of rear frame members 15 and the pair of support frame members 18 . Therefore, the electric power unit 52 can be easily attached/detached to/from the vehicle body frame 10 by attaching/detaching the reinforcing frame 21 .

In this way, by raising the rear frame member 15 and the support frame member 18 from the lower frame member 13 and integrating the respective frame members with the reinforcing frame 21, the rigidity of the rear side of the vehicle body frame 10 is ensured. . A pivot bracket 31 spans the rear frame member 15 and the support frame member 18, and the pivot bracket 31 functions as a bridge between the rear frame member 15 and the support frame member 18, thereby further increasing rigidity. Therefore, it is possible to reduce the cross-sectional area of each frame member by the amount corresponding to the increased rigidity, and to ensure a wide installation space for various units inside the frame.

As described above, according to the present embodiment, since the pivot bracket 31 is supported by the rear frame member 15 and the support frame member 18, the swing arm 55 can be supported with increased rigidity by the pivot bracket 31. excellent steering stability can be obtained. Since the rear frame member 15 and the support frame member 18 are connected in the longitudinal direction via the pivot bracket 31, the rigidity of the rear frame member 15 and the support frame member 18 is enhanced. Moreover, the cross-sectional area of the frame member can be reduced by the amount corresponding to the increase in rigidity of the entire frame structure, and a space can be secured between the frames.

In addition, in the present embodiment, the support frame member that configures the support frame is formed separately from the lower frame member that configures the lower frame, but the present invention is not limited to this configuration. The support frame member may be formed integrally with the lower frame member by bending the rear portion of the lower frame member upward.

Further, in the present embodiment, the groove shape of the pivot bracket projects inward in the vehicle width direction, but the present invention is not limited to this configuration. The groove shape of the pivot bracket may protrude outward in the vehicle width direction. Also, although the pivot bracket has a U-shaped groove in cross section, the cross section of the pivot bracket is not particularly limited. As long as sufficient rigidity can be ensured, the pivot bracket may not have a groove shape.

Further, in the present embodiment, the reinforcing frame is configured to have a rectangular shape, but the present invention is not limited to this configuration. The reinforcing frame may be configured to integrally connect the pair of rear frame members and the pair of support frame members.

In the present embodiment, a pair of lower frame members and a pair of rear frame members are connected by a bridge to form a lower frame or a rear frame. The support frame may be constructed by Thereby, the rigidity of the vehicle body frame can be further increased.

Moreover, in the present embodiment, the reinforcing frame is detachably connected to the pair of rear frame members and the pair of support frame members, but the configuration is not limited to this. The reinforcing frame may be integrally joined to the pair of rear frame members and the pair of support frame members.

Moreover, in the present embodiment, the electric power unit and the battery unit are arranged vertically, but the present invention is not limited to this configuration. The positional relationship between the electric power unit and the battery unit is not particularly limited, and for example, the battery unit may be installed in front of the electric power unit.

Moreover, in the present embodiment, an electric motorcycle is exemplified, but the configuration is not limited to this. The frame structure of the present disclosure is applicable to scooter-type motorcycles, and may be applied to motorcycles driven by a drive source other than an electric power unit.

Although the present embodiment has been described, other embodiments may be obtained by combining the above-described embodiments and modifications in whole or in part.

Also, the technology of the present disclosure is not limited to the above-described embodiments, and may be variously changed, replaced, and modified without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in another way by advancement of technology or another derived technology, the method may be used for implementation. Therefore, the claims cover all implementations that may fall within the scope of the technical concept.

Characteristic points in the embodiments of the present invention are summarized below.
The frame structure described in the above embodiment is a frame structure for a scooter-type two-wheeled vehicle in which a footrest space is formed in front of the seat, and includes a pair of lower frame members extending in the longitudinal direction of the vehicle below the footrest space; A pair of rear frame members rising from the lower frame member behind the footrest space, a pair of support frame members rising from the lower frame member behind the rear frame member, and the swing arm are capable of swinging up and down through the support shaft. and a pair of connected pivot brackets, wherein the pivot brackets span the rear frame member and the support frame member. According to this configuration, since the pivot bracket is supported by the rear frame member and the support frame member, the swing arm can be supported more rigidly by the pivot bracket, and excellent steering stability can be obtained. Since the rear frame member and the support frame member are connected in the longitudinal direction via the pivot bracket, the rigidity of the rear frame member and the support frame member is enhanced. Moreover, the cross-sectional area of the frame member can be reduced by the amount corresponding to the increase in rigidity of the entire frame structure, and a space can be secured between the frames.

The frame structure described in the above embodiment includes a reinforcing frame integrally connecting the pair of rear frame members and the pair of support frame members. According to this configuration, the pair of rear frame members and the pair of support frame members can be integrated via the reinforcing frame to increase the rigidity of the entire frame structure.

In the frame structure described in the above embodiment, the reinforcement frame is formed in a rectangular frame shape by a pair of front and rear frame portions extending in the vehicle front-rear direction and a pair of left and right frame portions extending in the vehicle width direction. According to this configuration, the torsional rigidity of the entire frame structure can be increased by the reinforcing frame in the shape of a rectangular frame.

In the frame structure described in the above embodiment, the upper side of the reinforcing frame is a mounting space for the battery unit, and the lower side of the reinforcing frame is an installation space for the electric power unit. According to this configuration, the battery unit and the electric power unit, which are heavy objects, are vertically arranged to centralize the mass, thereby obtaining steering stability.

In the frame structure described in the above embodiment, the reinforcement frame is detachably connected to the pair of rear frame members and the pair of support frame members. According to this configuration, it is possible to easily attach and detach the electric power unit by attaching and detaching the reinforcing frame.

In the frame structure described in the above embodiment, a bridge that connects the pair of lower frame members is provided, the reinforcing frame is provided with an upper bracket that supports the upper portion of the electric power unit, and the bridge supports the lower portion of the electric power unit. A bottom bracket is provided for According to this configuration, the electric power unit is supported by the upper bracket and the lower bracket, so that the overall rigidity of the frame structure can be increased by the electric power unit.

In the frame structure described in the above embodiment, the upper end of the support frame member is joined to a midpoint in the extending direction of the rear frame member, and the connection point of the rear frame member and the support frame member and the swing arm are the rear cushion unit. are spliced. According to this configuration, the push-up load from the rear cushion unit can be distributed to the rear frame member and the support frame member.

In the frame structure described in the above embodiment, the pivot bracket has a U-shaped groove with a rectangular cross section. According to this configuration, the rigidity of the pivot bracket can be increased to obtain better steering stability.

The scooter-type two-wheeled vehicle described in the above embodiment is characterized by including the frame structure described above. According to this configuration, the rigidity of the frame structure is increased, so that the steering stability of the scooter type two-wheeled vehicle can be improved.

1: Scooter type motorcycle 10: Body frame 13: Lower frame member 15: Rear frame member 18: Support frame member 21: Reinforcing frame 22: Front and rear frame portions 23: Left and right frame portions 27: Upper bracket 28: Lower bracket 31: Pivot bracket 32: Groove shape 51: Battery unit 52: Electric power unit 55: Swing arm 56: Rear cushion unit

Claims (7)

A frame structure of a scooter type motorcycle in which a footrest space is formed in front of a seat,
a pair of lower frame members extending in the longitudinal direction of the vehicle below the footrest space;
a pair of rear frame members rising from the lower frame member behind the footrest space;
a pair of support frame members rising from the lower frame member behind the rear frame member;
a pair of pivot brackets to which the swing arm is vertically swingably connected via a support shaft;
a reinforcing frame integrally connecting the pair of rear frame members and the pair of support frame members ,
the pivot bracket spans the rear frame member and the support frame member ;
A frame structure, wherein an upper side of the reinforcing frame is a mounting space for a battery unit, and a lower side of the reinforcing frame is an installation space for an electric power unit . A frame structure of a scooter type motorcycle in which a footrest space is formed in front of a seat,
a pair of lower frame members extending in the longitudinal direction of the vehicle below the footrest space;
a pair of rear frame members rising from the lower frame member behind the footrest space;
a pair of support frame members rising from the lower frame member behind the rear frame member;
a pair of pivot brackets to which the swing arm is vertically swingably connected via a support shaft;
a reinforcing frame integrally connecting the pair of rear frame members and the pair of support frame members;
a bridge that connects the pair of lower frame members,
the pivot bracket spans the rear frame member and the support frame member;
A frame structure, wherein the reinforcing frame is provided with an upper bracket for supporting an upper portion of the electric power unit, and the bridge is provided with a lower bracket for supporting a lower portion of the electric power unit. 3. The reinforcing frame according to claim 1 , wherein the reinforcing frame is formed in a rectangular frame shape by a pair of front and rear frame portions extending in the longitudinal direction of the vehicle and a pair of left and right frame portions extending in the vehicle width direction. frame structure. 4. The frame structure according to claim 1 , wherein the reinforcing frame is detachably connected to the pair of rear frame members and the pair of support frame members. an upper end of the support frame member is joined to a midpoint in the extending direction of the rear frame member;
5. The frame structure according to any one of claims 1 to 4 , wherein the connecting portion of the rear frame member and the support frame member and the swing arm are joined by a rear cushion unit. 6. The frame structure according to any one of claims 1 to 5 , wherein the pivot bracket has an angular U-shaped groove when viewed in cross section. A scooter-type two-wheeled vehicle comprising the frame structure according to any one of claims 1 to 6 .

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