Vehicle body structure of straddle-type vehicle

There is provided a vehicle body structure of a straddle-type vehicle in which an accommodation space of a battery is formed inside a pair of left and right seat rails supporting a seat. The vehicle body structure includes: a seat rail bridge connecting the pair of left and right seat rails; a pair of left and right frame covers covering the pair of left and right seat rails from sides; a battery cover covering the battery arranged in the accommodation space from above; and a frame cover bracket to which the pair of left and right frame covers are attached. The battery cover and the frame cover bracket are attached to the seat rail bridge.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on Japanese Patent Application No. 2020-174564 filed on Oct. 16, 2020, the contents of which are incorporated herein by way of reference.

TECHNICAL FIELD

The present invention relates to a vehicle body structure of a straddle-type vehicle.

BACKGROUND

A seat of a straddle-type vehicle is supported by a pair of left and right seat rails, and various electrical components are accommodated inside the pair of seat rails. A box-shaped battery holder is supported by the pair of seat rails, and a battery is held as an electrical component in the battery holder. An upper surface of the battery holder is open, and the battery is exposed from an opening of the battery holder. As a vehicle body structure of this type of straddle-type vehicle, there has been known a vehicle body structure for protecting the battery from a foreign matter, an impact, or the like by covering the opening of the battery holder with a battery cover (see, for example, Patent Literature 1).

Since various articles such as a manual are accommodated inside the pair of seat rails as well as electrical components such as the battery, it is necessary to ensure a large accommodation space inside the pair of seat rails. However, when the battery cover is attached to an inner side of the pair of seat rails, it is necessary to ensure a gap with other members in order to attach and detach the battery cover, and the accommodation space inside the pair of seat rails becomes narrow.

The present invention has been made in view of the foregoing, and an object of the present invention is to provide a vehicle body structure of a straddle-type vehicle that can effectively utilize an accommodation space inside a pair of seat rails even when a battery cover is provided.

SUMMARY

A vehicle body structure of a straddle-type vehicle according to an aspect of the present invention is a vehicle body structure of a straddle-type vehicle in which an accommodation space of a battery is formed inside a pair of left and right seat rails supporting a seat. The vehicle body structure includes a seat rail bridge connecting the pair of left and right seat rails, a pair of left and right frame covers covering the pair of left and right seat rails from sides, a battery cover covering the battery arranged in the accommodation space from above, and a frame cover bracket to which the pair of left and right frame covers are attached, and the battery cover and the frame cover bracket are attached to the seat rail bridge. Accordingly, the problems described above are solved.

DESCRIPTION OF EMBODIMENTS

In a vehicle body structure of a straddle-type vehicle according to an aspect of the present invention, an accommodation space of a battery is formed inside a pair of left and right seat rails supporting a seat. The pair of left and right seat rails are connected to each other by a seat rail bridge, and the pair of left and right seat rails are covered from sides by a pair of left and right frame covers. The battery is accommodated in the accommodation space, and the battery is covered with the battery cover from above. The pair of left and right frame covers are attached to a frame cover bracket. The battery cover and the frame cover bracket are attached to the seat rail bridge, and attachment positions of the battery cover and the frame cover bracket are collectively positioned on the seat rail bridge. Since the attachment portion of the battery cover and the attachment portion of the frame cover bracket are not dispersed, even when the battery cover is attached to the seat rail bridge in order to protect the battery, a large accommodation space is ensured inside the pair of left and right seat rails. Therefore, the accommodation space can be effectively utilized to improve the layout of electrical components and articles other than the battery.

Embodiment

Hereinafter, a straddle-type vehicle to which a vehicle body structure according to an embodiment is applied will be described in detail with reference to the accompanying drawings.FIG.1is a left side view of the straddle-type vehicle according to the present embodiment. In addition, in the following drawings, an arrow FR indicates a vehicle front side, an arrow RE indicates a vehicle rear side, an arrow L indicates a vehicle left side, and an arrow R indicates a vehicle right side.

As shown inFIG.1, a straddle-type vehicle1is configured by mounting various components such as an engine16and an electrical system on a twin spar type vehicle body frame10formed by aluminum casting. The vehicle body frame10includes a pair of main frames11branching from a head pipe (not shown) to the left and right and extending rearward, and a pair of down frames (not shown) branching from the head pipe to the left and right and extending downward. A rear portion of the engine16is supported by the pair of main frames11, and a front portion of the engine16is supported by the pair of down frames. Since the engine16is supported by the vehicle body frame10, rigidity of the entire vehicle is ensured.

Front side portions of the pair of main frames11are tank rails12positioned above the engine16, and a fuel tank17is supported by the tank rails12. Rear side portions of the pair of the main frame11are body frames13positioned behind the engine16, and swing arms18are swingably supported at substantially intermediate positions of the body frames13in an upper-lower direction. A pair of left and right seat rails14,15extend rearward from an upper portion of the body frame13. A driver's front seat21and a passenger's rear seat22are supported by the upper seat rails14.

A pair of front forks23are steerably supported on the head pipe via a steering shaft (not shown). A front wheel25is rotatably supported at lower portions of the front forks23. The swing arms18extend rearward from the body frames13. A rear wheel28is rotatably supported at rear ends of the swing arms18, and an upper side of the rear wheel28is covered with a rear fender29. The engine16is connected to the rear wheel28via a chain drive type transmission mechanism, and power from the engine16is transmitted to the rear wheel28via the transmission mechanism.

A front side of the vehicle body frame10is covered with a front cowl31, and a rear side of the front cowl31and a front side of the engine16are covered with a pair of side covers32. Sides of the pair of seat rails14,15and a lower side of the rear seat22are covered by a pair of frame covers33, and lower sides of the pair of seat rails14,15are covered with a lower cover34. Rear end portions of the pair of seat rails14,15are covered by a rear cover35, and a rear fender29is attached to a lower side of the rear cover35. A grab bar (not shown) for a passenger straddling the rear seat22to grip is supported by the upper seat rail14.

In such a straddle-type vehicle1, it is desired to arrange a battery68(seeFIG.6), which is a heavy object, below the front seat21in the vicinity of a center of the vehicle. An accommodation space for the battery68is formed inside the pair of seat rails14. In addition to the battery68, articles such as various electrical components and manuals are accommodated in the accommodation space, so that it is necessary to ensure a large accommodation space. When a battery cover61(seeFIG.5) is provided in the accommodation space for battery protection, it is difficult to ensure a large accommodation space since a gap between the battery cover61and other members is required due to attachment and detachment of the battery cover61.

Therefore, in a vehicle body structure of the straddle-type vehicle1according to the present embodiment, attachment portions of various members are collectively positioned, in addition to an attachment portion of the battery cover61, on a seat rail bridge43(seeFIG.5) connecting the pair of seat rails14. Since the attachment portion is not required for each member, the straddle-type vehicle1has a simple vehicle body structure, and a large accommodation space for an electrical component, an article, or the like is ensured inside the pair of seat rails14. At this time, since the height of an accommodated article arranged below the front seat21is suppressed and the accommodated article does not interfere with the front seat21, a flat seat surface is ensured widely on the front seat21in a front-rear direction.

Hereinafter, the vehicle body structure of the straddle-type vehicle will be described with reference toFIGS.2to6.FIG.2is a top view of a vehicle rear portion around a seat according to the present embodiment.FIG.3is a top view of the vehicle rear portion with the rear seat removed fromFIG.2.FIG.4is a perspective view of the vehicle rear portion with the seat according to the present embodiment removed.FIG.5is a top view of the vehicle rear portion with the front seat and the frame cover removed fromFIG.3.FIG.6is a top view of the vehicle rear portion with the battery cover removed fromFIG.5.

As shown inFIG.2, the front seat21and the rear seat22are provided side by side in the front-rear direction in the vehicle rear portion of the straddle-type vehicle1. A rear end portion of the front seat21on the front side is recessed forward toward an inner side in a vehicle width direction, and a front end portion of the rear seat22on the rear side bulges forward toward the inner side in the vehicle width direction. The bulge at the front end portion of the rear seat22enters the recess at the rear end portion of the front seat21, and the front seat21and the rear seat22are connected to each other without a gap as viewed from the top of the vehicle. The pair of frame covers33are provided on the left and right sides of the rear seat22, and the rear cover35is provided on the rear side of the rear seat22.

As shown inFIG.3, when the rear seat22(seeFIG.2) is detached from the vehicle rear portion of the straddle-type vehicle1, the inner sides of the pair of frame covers33are exposed upward. Rear half portions of the pair of seat rails14are covered from sides by the pair of frame covers33. Plate-shaped rear seat brackets41,42are attached to the rear half portion of the pair of seat rails14, and the pair of seat rails14are connected by the rear seat brackets41,42. A cylindrical seat rail bridge43is joined to the pair of seat rails14in front of the rear seat bracket41, and the pair of seat rails14are connected by the seat rail bridge43.

The pair of frame covers33are attached to the seat rail bridge43via a frame cover bracket51. A seat plate47of the front seat21is attached to a center of the frame cover bracket51in the vehicle width direction via a tubular cushion81. The front end portion of the rear seat22(seeFIG.2) is supported from below by an upper surface of the cushion81, and a rear end portion of the rear seat22is supported from below by the rear cover35. In a state in which the rear seat22is supported by the cushion81and the rear cover35, the rear seat22is fixed to the rear seat brackets41,42by bolts (not shown).

As shown inFIGS.4and5, when the front seat21(seeFIG.3) is detached from the vehicle rear portion of the straddle-type vehicle1, the battery cover61that protects the battery68inside the pair of seat rails14,15is exposed upward. On the left and right sides of the battery cover61, rail brackets71are joined to the inner side surfaces of the pair of seat rails14. The pair of rail brackets71extend along the seat rail14. A long plate-shaped front seat bracket72is attached to front end portions of the pair of rail brackets71, and the pair of seat rails14are connected to each other by the front seat bracket72.

A pair of support frames73are attached to the front seat bracket72, and the pair of support frames73extend forward from the front seat bracket72. A long plate-shaped support frame bracket74is attached to front end sides of the pair of support frames73, and the pair of support frames73are connected to each other by the support frame bracket74. A cushion76with a protrusion is attached to each of the rail brackets71, the front seat bracket72, and the support frame bracket74, and the seat plate47(seeFIG.3) of the front seat21is attached to the protrusions of the plurality of cushions76.

In the front seat bracket72, a pair of attachment holes75for the battery cover61are formed inside attachment portions of the pair of support frames73. A pair of attachment pieces62on a front end side of the battery cover61are pressed against a lower surface of the front seat bracket72, and the pair of attachment pieces62are fixed to the pair of attachment holes75of the front seat bracket72by a pair of bolts (not shown). The frame cover bracket51is superposed on upper surfaces of a pair of attachment pieces63on a rear end side of the battery cover61, and the pair of attachment pieces63are fixed to the seat rail bridge43together with the frame cover bracket51by a pair of bolts59.

The battery cover61covers the battery68arranged inside the pair of seat rails14,15from above. The battery cover61includes a horizontal plate portion64positioned above the battery68, and an inclined plate portion65extending obliquely upward and rearward from a rear end of the horizontal plate portion64to the seat rail bridge43. Since the battery68is covered by the battery cover61, the battery68is protected from a foreign matter or an impact. An upper surface of the horizontal plate portion64is also used as a placement surface of other electrical component or an article, and not only the accommodation space below the battery cover61but also the accommodation space above the battery cover61is effectively utilized.

The frame cover bracket51is formed by bending a long plate into a W shape as viewed from the front, and extends along the seat rail bridge43. Both end portions and a central portion of the frame cover bracket51protrude upward, and a pair of bottom portions between both end portions and the central portion of the frame cover bracket51are recessed downward. The pair of bottom portions of the frame cover bracket51are fixed to the seat rail bridge43by the pair of bolts59via the pair of attachment pieces63of the battery cover61, and both end portions and the central portion of the frame cover bracket51are separated upward from the seat rail bridge43.

A pair of cover attachment holes (cover attachment portions)52to which the pair of frame covers33are attached are formed at both end portions of the frame cover bracket51. A seat attachment hole (seat attachment portion)53to which the front seat21(seeFIG.2) is attached is formed in the central portion of the frame cover bracket51. A pair of bridge attachment holes (bridge attachment portions, seeFIG.8)54, which are attached to the seat rail bridge43, are formed at a pair of bottom portions of the frame cover bracket51. Attachment states of the pair of frame covers33, the front seat21, the frame cover bracket51, and the battery cover61will be described later.

As described above, the frame cover bracket51includes the pair of cover attachment holes52positioned on an outer side in the vehicle width direction with respect to the pair of bridge attachment holes54, and the seat attachment hole53positioned between the pair of bridge attachment holes54. In addition, as viewed from a direction perpendicular to a plate surface of the frame cover bracket51, the pair of cover attachment holes52, the pair of bridge attachment holes54, and the seat attachment hole53are aligned on the same straight line. The attachment holes of the battery cover61, the frame cover bracket51, the frame covers33, and the front seat21are collectively positioned on the seat rail bridge43, and tool lines for an attachment work by using tools are also collectively positioned to improve workability.

As shown inFIG.6, when the battery cover61and the frame cover bracket51(seeFIG.5) are detached from the vehicle rear portion of the straddle-type vehicle1, planar portions44of the battery68and the seat rail bridge43are exposed upward. The battery68is held by a battery holder69, and the battery68is arranged in the accommodation space via the battery holder69. In addition to the battery68, an electrical component such as an electronic control unit (ECU), a fuse box, an electronic toll collection (ETC) unit, or a harness, or an article such as a manual or a tool may be accommodated in the accommodation space.

In the seat rail bridge43, the planar portion44is formed in which a part of an outer peripheral surface is recessed and the battery cover61is attached. A pair of self-locking nuts45are fixed to the planar portion44of the seat rail bridge43, and head portions of the pair of self-locking nuts45protrude from the planar portion44. The pair of self-locking nuts45are attached to positions corresponding to attachment holes66(seeFIG.8) of the pair of attachment pieces63of the battery cover61. Recesses67(seeFIG.8) for receiving the head portions of the self-locking nuts45are formed on lower surfaces of the pair of attachment pieces63, and the head portions of the self-locking nuts45enters the recesses67, so that the battery cover61is positioned on the seat rail bridge43.

Attachment states of the seat bracket, the battery cover, and the seat will be described with reference toFIGS.7to9.FIG.7is a perspective view showing the attachment state of the seat bracket according to the present embodiment.FIG.8is a sectional view showing the attachment state of the battery cover according to the present embodiment.FIG.9is a sectional view showing the attachment state of the seat according to the present embodiment.

As shown inFIG.7, the pair of bottom portions of the frame cover bracket51are attached to the seat rail bridge43by the pair of bolts59together with the pair of attachment pieces63of the battery cover61(seeFIG.5). Both end portions and the central portion of the frame cover bracket51are floated from the seat rail bridge43, the pair of frame covers33are attached to both end portions thereof, and the seat plate47of the front seat21is attached to the center portion thereof. At this time, both end portions and the central portion of the frame cover bracket51have the same height, and the front seat21on the seat plate47is in contact with the pair of the frame covers33.

Upper surfaces of the pair of frame covers33overhangs toward both end portions of the frame cover bracket51, and boss portions38protrude from lower surfaces of overhang portions37of the frame covers33. Tubular cushions (not shown) are attached to the cover attachment holes52(seeFIG.5) of the frame cover bracket51. The overhang portions37of the frame covers33are superposed on both end portions of the frame cover bracket51from above, and the frame cover33is attached to the frame cover bracket51by inserting the boss portions38into the cushions. A claw is formed at a tip end of the boss portion38, and the claw is caught on the cushion to prevent the frame cover33from coming off. As a result, the attachment portions of the pair of frame covers33are collectively positioned on the seat rail bridge43.

As shown inFIG.8, the head portions of the pair of self-locking nuts45(only one is shown inFIG.8) protrude from the planar portion44of the seat rail bridge43. The pair of attachment pieces63of the battery cover61are superposed on the planar portion44of the seat rail bridge43from above, and the head portions of the pair of self-locking nuts45enter the recesses67of the pair of attachment pieces63. The battery cover61is positioned with respect to the seat rail bridge43, and the attachment holes66of the pair of attachment pieces63are easily aligned with screw holes46of the self-locking nuts45. In addition, the frame cover bracket51is superposed on the pair of attachment pieces63from above, and the pair of bridge attachment holes54are aligned with the attachment holes66of the pair of attachment pieces63.

Tip ends of the pair of bolts59are inserted into the screw holes46of the pair of self-locking nuts45through the pair of bridge attachment holes54and the attachment holes66of the pair of attachment pieces63. When the bolt59is tightened, the frame cover bracket51is pressed against the battery cover61, and the battery cover61is sandwiched between the frame cover bracket51and the self-locking nuts45. The pair of attachment pieces63and the frame cover bracket51are fastened and fixed to the seat rail bridge43by the same bolts59, and a burden of attaching the battery cover61and the frame cover bracket51is reduced. As a result, the attachment portions of the frame cover bracket51and the battery cover61are collectively positioned on the seat rail bridge43.

At this time, the planar portion44of the seat rail bridge43is formed by recessing a part of the outer peripheral surface of the seat rail bridge43, and the upper surfaces of the pair of attachment pieces63on the planar portion44are adjusted to have the same height as the upper surfaces of the pair of seat rails14. The battery cover61and the frame cover bracket51are lowered, the height of the battery68below the front seat21is suppressed, and it becomes easy to ensure the flat seat surface of the front seat21. Since the seat rail14is inclined so as to be higher toward the rear, the frame cover bracket51is lowered, so that the front end of the rear seat22is retreated and the flat seat surface of the front seat21is widely ensured.

As shown inFIG.9, a welding nut55is joined coaxially with the seat attachment hole53on the lower surface of the central portion of the frame cover bracket51. The cushion81is a rubber bush having an H-shaped cross section, and a cylindrical spacer82is mounted inside the cushion81. The cushion81is superposed on the seat attachment hole53, and a through hole83of the spacer82is aligned with the seat attachment hole53. Tip end of a bolt84is inserted into a screw hole85of the welding nut55through the through hole83of the spacer82and the seat attachment hole53. When the bolt84is tightened, the cushion81is attached to the frame cover bracket51.

An annular groove86to which the seat plate47of the front seat21is mounted is formed on an outer peripheral surface (attachment surface)87of the cushion81. A mounting hole49is formed in an extending portion48at a rear end of the seat plate47, and an opening edge of the mounting hole49enters the annular groove86of the cushion81, so that a rear end side of the front seat21is attached to the outer peripheral surface87of the cushion81. A recess88for accommodating a head portion of the bolt84is formed on the upper surface (support surface)89of the cushion81. When the cushion81around the recess88abuts against a seat plate50of the rear seat22, a front end side of the rear seat22is supported from below by the upper surface89of the cushion81. As a result, the attachment portion of the front seat21and a support portion of the rear seat22are collectively positioned on the seat rail bridge43.

As described above, according to the present embodiment, the attachment portions of the pair of frame covers33, the attachment portion of the frame cover bracket51, the attachment portion of the battery cover61, the attachment portion of the front seat21, and the support portion of the rear seat22are collectively positioned on the seat rail bridge43.

Since the attachment portion and the support portion of the members are not dispersed, even when the battery cover61is attached to the seat rail bridge43in order to protect the battery, a large accommodation space is ensured inside the pair of seat rails14. Therefore, the accommodation space can be effectively utilized to improve the layout of electrical components and articles other than the battery68.

In the present embodiment, the frame cover bracket is superposed on the upper surface of the battery cover, but the battery cover may be superimposed on an upper surface of the frame cover bracket.

In the present embodiment, the battery cover and the frame cover bracket are attached to the seat rail bridge by the pair of bolts, but a method for attaching the battery cover and the frame cover bracket is not particularly limited. The battery cover and the frame cover bracket may be attached to the seat rail bridge by other attachment method such as hooking or clipping.

In the present embodiment, the frame cover is attached to the frame cover bracket by the boss portion of the frame cover, but a method for attaching the frame cover is not particularly limited. The frame cover may be attached to the frame cover bracket by other attachment method such as screwing, hooking, or clipping.

In the present embodiment, the front seat is attached to the frame cover bracket by the cushion attached to the frame cover bracket, but a method for attaching the front seat is not particularly limited. The front seat may be attached to the frame cover bracket by other attachment method such as screwing, hooking, or clipping without interposing a cushion.

In the frame cover bracket according to the present embodiment, the pair of cover attachment holes are positioned on the outer side in the vehicle width direction with respect to the pair of bridge attachment holes, and the seat attachment hole is positioned between the pair of bridge attachment holes, but the positions and the number of the attachment holes are not particularly limited. The frame cover bracket may be provided with a bridge attachment hole, a cover attachment hole, and a seat attachment hole.

Although the bridge attachment hole is illustrated as an example of the bridge attachment portion in the present embodiment, the bridge attachment portion may have any shape as long as the bridge attachment portion can be attached to the seat rail bridge. Although the cover attachment hole is illustrated as an example of the cover attachment portion, the cover attachment portion may have any shape as long as the cover attachment portion can allow the frame cover to be attached. Further, although the seat attachment hole is illustrated as an example of the seat attachment portion, the seat attachment portion may have any shape as long as the seat attachment portion can allow the seat to be attached. The bridge attachment portion, the cover attachment portion, and the seat attachment portion may have, for example, a cutout shape.

In the present embodiment, the front seat and the rear seat are supported as the seats on the pair of seat rails, but at least the front seat may be supported on the pair of seat rails.

In the present embodiment, the battery cover is positioned on the seat rail bridge by the self-locking nut protruding from the outer peripheral surface of the seat rail bridge and the recess formed on the lower surface of the battery cover, but a positioning configuration is not particularly limited. For example, the battery cover may be positioned on the seat rail bridge by a protrusion protruding from the lower surface of the battery cover and a recess formed on the outer peripheral surface of the seat rail bridge.

In the present embodiment, the planar portion is formed by recessing the outer peripheral surface of the seat rail bridge so that the upper surface of the battery cover has the same height as the upper surface of the seat rail, but the planar portion may be formed by recessing the outer peripheral surface of the seat rail bridge so that the upper surface of the battery cover is lower than the upper surface of the seat rail.

In the present embodiment, the battery cover includes the horizontal plate portion and the inclined plate portion, but the shape of the battery cover is not particularly limited as long as the battery cover is formed so as to cover the battery from above.

The vehicle body structure may be adopted not only to the straddle-type vehicle shown in the drawings but also in other types of straddle-type vehicles. The straddle-type vehicle is not limited to general vehicles in which a rider rides in a posture of straddling a seat, and also includes a small-sized scooter-type vehicle in which a rider rides without straddling the seat.

As described above, the vehicle body structure of a straddle-type vehicle according to the present embodiment is a vehicle body structure of a straddle-type vehicle in which an accommodation space of a battery (68) is formed inside a pair of left and right seat rails (14) supporting a seat (front seat21). The vehicle body structure includes a seat rail bridge (43) connecting the pair of left and right seat rails, a pair of left and right frame covers (33) covering the pair of left and right seat rails from sides, a battery cover (61) covering the battery arranged in the accommodation space from above, and a frame cover bracket (51) to which the pair of left and right frame covers are attached. The battery cover and the frame cover bracket are attached to the seat rail bridge. According to this configuration, the attachment portions of the battery cover and the frame cover bracket are collectively positioned on the seat rail bridge. Since the attachment portion of the battery cover and the attachment portion of the frame cover bracket are not dispersed, even when the battery cover is attached to the seat rail bridge in order to protect the battery, a large accommodation space is ensured inside the pair of left and right seat rails. Therefore, the accommodation space can be effectively utilized to improve the layout of electrical components and articles other than the battery.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, the battery cover and the frame cover bracket overlap with each other in an upper-lower direction, and are attached to the seat rail bridge by the same fastening member (bolt59). According to this configuration, attachment portions of the battery cover and the frame cover bracket are reduced, and the large accommodation space is ensured inside the pair of left and right seat rails. In addition, the battery cover and the frame cover bracket can be attached at a time by the fastening member, and a burden of attaching the battery cover and the frame cover bracket can be reduced.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, the frame cover bracket extends along the seat rail bridge, the frame cover bracket has a bridge attachment portion (bridge attachment hole54) attached to the seat rail bridge and a pair of cover attachment portions (cover attachment holes52) to which the pair of left and right frame covers are attached, and the pair of cover attachment portions are positioned on an outer side in a vehicle width direction than the bridge attachment portion. According to this configuration, similarly to the attachment portions of the battery cover and the frame cover bracket, attachment portions of the pair of left and right frame covers are also collectively positioned on the seat rail bridge, and the large accommodation space is ensured inside the pair of left and right seat rails.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, the frame cover bracket is formed with a seat attachment portion (seat attachment hole53) to which the seat is attached, the bridge attachment portion is a pair of bridge attachment portions separated from each other in the vehicle width direction, and the seat attachment portion is positioned between the pair of bridge attachment portions. According to this configuration, similarly to the attachment portions of the battery cover and the frame cover bracket, an attachment portion of the seat is also collectively positioned on the seat rail bridge, and the large accommodation space is ensured inside the pair of left and right seat rails.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, the pair of cover attachment portions, the pair of bridge attachment portions, and the seat attachment portion are aligned on the same straight line in the frame cover bracket. According to this configuration, the attachment portions of the battery cover, the frame cover bracket, the frame cover, and the seat are collectively positioned on the seat rail bridge, and tool lines for an attachment work by using tools are also collectively positioned.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, the seat has a front seat (21) and a rear seat (22), a cushion (81) is attached to the seat attachment portion, and the cushion is formed with an attachment surface (outer peripheral surface87) to which a rear end side of the front seat is attached and a support surface (upper surface89) that supports a front end side of the rear seat from below. According to this configuration, an attachment portion on the rear end side of the front seat and a support portion on the front end side of the rear seat are collectively positioned on the seat rail bridge, and the large accommodation space is ensured inside the pair of left and right seat rails.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, a self-locking nut (45) is attached to an outer peripheral surface of the seat rail bridge so as to protrude from the outer peripheral surface, the battery cover is formed with a positioning portion (recess67) for receiving the self-locking nut protruding from the outer peripheral surface of the seat rail bridge, and the battery cover is sandwiched between the self-locking nut and the frame cover bracket. According to this configuration, the battery cover is easily positioned with respect to the seat rail bridge, and the battery cover and the frame cover bracket can be easily attached to the seat rail bridge.

In the vehicle body structure of a straddle-type vehicle according to the present embodiment, the seat rail bridge is formed into a cylindrical shape, a planar portion (44) to which the battery cover is attached is formed on the outer peripheral surface of the seat rail bridge, and the planar portion is formed by recessing the outer peripheral surface of the seat rail bridge so that an upper surface of the battery cover has the same height as upper surfaces of the pair of left and right seat rails or is lower than the upper surfaces of the pair of left and right seat rails. According to this configuration, since the battery cover and the frame cover bracket are lowered and the height of the member below the seat is suppressed, it is easy to ensure a wide flat seat surface of the seat.

Although the present embodiment has been described, the above-described embodiment and modifications may be combined entirely or partially as other embodiment.

The technique of the present invention is not limited to the above-described embodiment, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical concept of the present invention. The present invention may be implemented using other methods as long as the technical concept can be implemented by the methods through advance of the technology or other derivative technology. Accordingly, the claims cover all embodiments that may be included within the scope of the technical concepts.