JP7024474B2 - Motorcycle frame structure - Google Patents

Description

The present invention relates to a frame structure of a motorcycle.

In some motorcycles, predetermined functional parts are arranged in a space below a pair of frames extending in the front-rear direction. For example, the motorcycle described in Patent Document 1 is a fuel cell vehicle, and a fuel supply system including a fuel tank and the like is arranged in a space below a pair of frames. A cross member (frame bridge) is bridged between the pair of frames, and a tank valve as a valve device connected to the fuel tank is arranged below the cross member. The cross member is fixed to a pair of frames by welding, for example.

Japanese Unexamined Patent Publication No. 2017-114213

However, in Patent Document 1, there is a problem that the cross member is fixed to the pair of frames, which affects the assemblability of the tank valve below the cross member and the accessibility to the tank valve.

The present invention has been made in view of the above points, and provides a frame structure of a motorcycle capable of improving the assembling property of vehicle components under the frame bridge and the accessibility to the lower side of the frame bridge. The purpose is.

The frame structure of the motorcycle according to one aspect of the present invention is formed in a convex shape on the upper side by connecting a pair of left and right seat frames extending downwardly in the front and rear of the seat of the motorcycle and the pair of left and right seat frames. Holds a frame bridge having an inclined portion inclined along the back surface of the seat and a horizontal portion extending horizontally along the rear end of the inclined portion, and vehicle components arranged in the space below the frame bridge. A bracket is provided, and a notch or a hole is formed in the inclined portion of the frame bridge, and the bracket has a long portion extending in the vehicle width direction and the long portion extending from the trailing edge of the long portion. It has a bent portion that is bent substantially at right angles to the scale portion, the vehicle component is attached to the rear end portion of the bent portion, and the bracket is removable with respect to the frame bridge. The vehicle components attached to the frame bridge so that the elongated portion straddles at least a part of the notch or the hole, and the vehicle component attached to the bent portion in a side view, is the inclined portion of the frame bridge and the said portion. It is characterized by being arranged in the space below the horizontal portion .

According to the present invention, it is possible to improve the assembling property of vehicle components under the frame bridge and the accessibility to the lower side of the frame bridge.

It is a left side view which shows the schematic structure of the frame structure of the motorcycle which concerns on this embodiment. It is a vertical sectional view around a seat frame. It is an enlarged perspective view of the peripheral structure of a seat frame. It is the figure which omitted the seat frame cover from FIG. It is an enlarged view of the bracket which holds a vehicle component.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, an example in which the present invention is applied to a sports type motorcycle will be described, but the application target is not limited to this and can be changed. For example, the frame structure of the motorcycle according to the present invention may be applied to other types of motorcycles, buggy type motorcycles, and the like. Further, regarding the direction, the front of the vehicle is indicated by the arrow FR and the rear of the vehicle is indicated by the arrow RE. Further, in each of the following figures, some configurations are omitted for convenience of explanation.

With reference to FIG. 1, a schematic configuration of a frame structure of a motorcycle according to the present embodiment will be described. FIG. 1 is a left side view showing a schematic configuration of a frame structure of a motorcycle according to the present embodiment.

As shown in FIG. 1, the motorcycle according to the present embodiment is configured by suspending a power unit (both not shown) including an engine and a transmission on a vehicle body frame 1. The vehicle body frame 1 is, for example, a diamond frame made of steel or an aluminum alloy, and suspends a power unit as described above. The vehicle body frame 1 is formed by connecting a plurality of pipes by welding or the like.

Specifically, the vehicle body frame 1 includes a head pipe 10, a main frame 11 extending rearward from the upper end of the head pipe 10, and a down frame 12 extending downward from substantially the center of the head pipe 10 in the axial direction.

The main frame 11 is slightly inclined downward toward the rear, and branches to the left and right on the way. Then, each of the left and right mainframes 11 bends downward and extends to the rear and lower part of the engine. The rear part of the engine is supported by the mainframe 11. The down frame 12 includes a suspension portion for suspending the front portion of the engine.

Further, a pair of left and right seat frames 13 extending rearward are welded to each bent portion of the main frame 11 branched to the left and right. The seat frame 13 is slightly inclined upward toward the rear. A front seat 14 and a rear seat 15 are provided above the seat frame 13 from the front side. Rear handles 16 for passengers are attached to the left and right sides of the rear seat 15.

Further, in the pair of left and right main frames 11, a pair of rear frames 17 extending downward and upward are welded in the middle of the portions extending downward. The rear end of the rear frame 17 is connected to the rear portion of the seat frame 13 from below. A passenger footrest bracket 18 extending in a V-shape in a side view is connected to the middle of the rear frame 17. Further, in the latter half of the pair of left and right rear frames 17, a first rear fender 19 is provided so as to cover the space between the frames from below. At the rear end of the first rear fender 19, a second rear fender 20 that extends rearward and covers the upper part of the rear wheel (not shown) is provided.

Further, as will be described in detail later, predetermined vehicle components are arranged in the space surrounded by the pair of left and right seat frames 13 and the rear frame 17.

Various exterior covers are provided on each part of the vehicle body frame 1 configured in this way. Specifically, the upper half of the side view of the main frame 11 is covered by the upper side cover 21, and the lower half of the side view of the main frame 11 is covered by the lower side cover 22. The side (outside) of the seat frame 13 is covered by the seat frame cover 23, and the side of the rear frame 17 is covered by the rear frame cover 24.

Next, the frame structure of the motorcycle will be described in detail with reference to FIGS. 2 to 5. FIG. 2 is a vertical sectional view around the seat frame. FIG. 3 is an enlarged perspective view of the peripheral configuration of the seat frame. FIG. 4 is a diagram in which the seat frame cover is omitted from FIG. FIG. 5 is an enlarged view of a bracket that holds vehicle components.

As shown in FIGS. 2 to 4, a frame bridge 4 connecting the front seat 14 and the rear seat 15 is welded to the pair of left and right seat frames 13 in the vicinity of the boundary. The frame bridge 4 enhances the torsional rigidity of the seat frame 13. The frame bridge 4 also serves as a support member that supports a part of the front seat 14 and the rear seat 15.

The front seat 14 has a lower surface 14a facing the seat frame 13 and a back surface 14b rising upward from the rear end portion of the lower surface 14a. The back surface 14b of the front seat 14 is inclined upward toward the rear. The lower surface 14a of the front seat 14 is supported by a pair of left and right seat frames 13, and the back surface 14b is supported by a frame bridge 4. The lower surface of the rear seat 15 has a horizontal plane 15a in the first half portion and an inclined surface 15b in which the latter half portion gently inclines upward toward the rear. The horizontal plane 15a of the rear seat 15 is supported by the frame bridge 4.

Further, a seat side bridge 25 and a fender side bridge 26 connecting the rear ends of the pair of left and right seat frames 13 are also welded to each other. The torsional rigidity of the seat frame 13 is also enhanced by the seat side bridge 25 and the fender side bridge 26.

The seat-side bridge 25 located above the seat frame 13 also serves as a support member that supports a part of the rear seat 15. The seat side bridge 25 connects the rear end portions of the pair of left and right seat frames 13. The rear end portion of the rear seat 15 is supported by the upper surface of the seat side bridge 25. Further, the fender side bridge 26 located on the lower side of the seat frame 13 also serves as a support member for supporting a part of the first rear fender 19. The fender side bridge 26 connects the rear end portions of the pair of left and right rear frames 17. The lower surface of the fender side bridge 26 supports the rear end portion of the first rear fender 19.

Here, the detailed configuration of the frame bridge 4 will be described. The frame bridge 4 is formed of a convex plate-like body that bulges upward, and has a left-right width corresponding to a facing distance between the pair of left and right seat frames 13 and a predetermined front-rear width. More specifically, the frame bridge 4 has an inclined portion 40 inclined along the back surface 14b of the front seat 14 in a side view, a horizontal portion 41 extending horizontally connected to the rear end of the inclined portion 40, and four corners in front, back, left and right. It has a plurality of (four in this embodiment) leg portions 42, which are formed.

The inclined portion 40 is inclined upward toward the rear like the back surface 14b of the front seat 14. Further, the inclined portion 40 has a notch 43 formed in the central portion in the vehicle width direction. As a result, the frame bridge 4 as a whole has a U-shape in a top view with the front open. The inclined portion 40 faces the back surface 14b of the front seat 14, and supports the back surface 14b of the front seat 14 via a seat cushion (not shown) provided between the inclined portion 40 and the front seat 14. The horizontal portion 41 faces the horizontal plane 15a of the rear seat 15, and supports the horizontal plane 15a of the rear seat 15 via the seat striker 28 provided on the upper surface.

The four legs 42 form a connection portion with a pair of left and right seat frames 13, and two legs 42 arranged in the front-rear direction are welded to one seat frame 13. A gap corresponding to the facing distance between the pair of left and right seat frames 13 is formed between the two legs 42 arranged side by side. Further, openings 44 are formed on both left and right sides of the frame bridge 4, and a predetermined gap is formed between the two legs 42 arranged in the front-rear direction. The number of legs 42 is not limited to four, and can be changed as appropriate.

Further, in the space surrounded by the front seat 14, the rear seat 15, the first rear fender 19, the pair of left and right seat frames 13, and the rear frame 17, the relay 29, the fuel cut sensor 30, and the ECU 31 (Electronic Control Unit) are used as vehicle components. Electrical components such as are arranged. In particular, the relay 29 is arranged in the lower space formed by the frame bridge 4 that bulges upward. More specifically, the relay 29 is located between the pair of left and right seat frames 13 below the inclined portion 40 and the horizontal portion 41 and above the axial center of the seat frame 13. Although the details will be described later, the relay 29 is attached to the frame bridge 4 via the bracket 5 in a state of being fixed to the plate-shaped bracket 5 in advance.

Below the relay 29, a fuel cut sensor 30 and an ECU 31 are arranged as other vehicle components. Further, the fuel cut sensor 30 and the ECU 31 are arranged below the seat frame 13 in the side view and are held on the upper surface side of the second rear fender 20. More specifically, the fuel cut sensor 30 is arranged directly below the relay 29, and the ECU 31 is arranged below the rear of the relay 29.

By the way, in a motorcycle, when vehicle components such as electrical components are arranged in a limited space surrounded by a frame, the ease of assembling the vehicle components and the accessibility to the space have been problems. For example, it is assumed that the frame bridge connecting the pair of left and right seat frames becomes an obstacle, making it difficult to assemble when arranging vehicle components below the frame bridge and to access the bottom of the frame bridge. To.

Therefore, the present inventors have focused on the shape of the frame bridge and came up with the present invention. Specifically, in the present embodiment, a notch 43 corresponding to the size of the vehicle component (relay 29) is formed in a part (inclined portion 40) of the frame bridge 4 and straddles a part of the notch 43. The plate-shaped bracket 5 is attached as described above. The bracket 5 holds a relay 29 arranged in the space below the frame bridge 4, and is configured to be removable from the frame bridge 4.

According to this configuration, the relay 29 can be easily arranged in the space below the frame bridge 4 by fixing the relay 29 to the bracket 5 in advance and attaching the bracket 5 to the frame bridge 4. Further, since the bracket 5 can be attached to and detached from the frame bridge 4, the bracket 5 can be removed from the frame bridge 4 together with the relay 29. As a result, the notch 43 of the frame bridge 4 is opened, and it becomes possible to access the space below the frame bridge 4 through the notch 43. That is, the assembling property of the relay 29 below the frame bridge 4 and the accessibility to the relay 29 (below the frame bridge 4) are improved.

Next, the peripheral configuration of the bracket 5 will be described in detail. As shown in FIGS. 3 to 5, the bracket 5 is formed by bending a metal plate having a predetermined thickness. Specifically, the bracket 5 has a long portion 50 extending in the vehicle width direction (left-right direction) and a pair of bent portions 51 extending from the trailing edge portion of the long portion 50 and bent at a substantially right angle to the long portion 50. And have.

The long portion 50 has a length corresponding to the left-right width of the inclined portion 40 so as to straddle the notch 43 on the left and right. Through holes 52 for inserting fixing screws B are formed at both ends of the long portion 50. In addition, screw holes (not shown) are formed at both ends of the inclined portion 40 corresponding to the through holes 52.

The pair of bent portions 51 are arranged side by side within the width of the notch 43. The left-right width of each bent portion 51 is set sufficiently smaller than the width of the notch 43. A relay 29 is attached to the rear end portion of the bent portion 51.

The relay 29 generally has a rectangular parallelepiped shape, and the outside is covered with an elastic body 29a having a complementary shape. The elastic body 29a is formed of, for example, rubber or the like. The upper surface of the elastic body 29a projects one step upward with respect to the bent portion 51, and a slit (not shown) for inserting the bent portion 51 is formed in the protruding portion. The relay 29 can be floated and supported by inserting the bent portion 51 through the slit, and vibration transmission to the relay 29 is suppressed. Note that FIGS. 3 and 4 show a state in which the relay 29 is attached to each bent portion 51, and FIG. 5 shows a state in which the relay 29 is attached to only one (right side).

In the state where the relay 29 is attached to the bracket 5, the back surface of the long portion 50 and the front surface of the relay 29 (elastic body 29a) face each other as shown in FIG. Further, as shown in FIG. 4, in a state where the two relays 29 are arranged side by side, the left-right width of the two relays 29 (including the elastic body 29a) is smaller than the left-right width of the notch 43. It has become. Therefore, the bracket 5 can be attached to and detached from the frame bridge 4 while the relay 29 is attached to the bracket 5 without the relay 29 interfering with the frame bridge 4. In this way, the workability of attaching and detaching the bracket 5 and the relay 29 is improved.

Further, by making the frame bridge 4 convex on the upper side and arranging the relay 29 in the space below the frame bridge 4 formed by the convex shape, the limited space between the pair of left and right seat frames 13 can be effectively utilized. It is possible to do. Further, by arranging the fuel cut sensor 30 and the ECU 31 held on the first rear fender 19 below the relay 29, that is, below the seat frame 13, the limited space between the pair of left and right seat frames 13 is provided. Can also be used in the height direction.

Further, by forming a predetermined gap between the plurality of legs 42 constituting the connection portion with the seat frame 13, it is possible to secure an escape route for air around the electrical components, and the heat dissipation is improved. ..

Further, as shown in FIG. 3, when the bracket 5 is attached to the frame bridge 4, the seat frame cover 23 is also attached. That is, the pair of left and right seat frame covers 23 are attached to the frame bridge 4 together with the bracket 5. Specifically, the seat frame cover 23 has a side wall portion 23a that covers the outside of the seat frame 13, and a protruding portion 23b that protrudes inward in the vehicle width direction from a part of the side wall portion 23a.

The protruding portion 23b is provided at a position facing the upper surface of the inclined portion 40, and a through hole (not shown) is formed at a position corresponding to a screw hole (not shown). A long portion 50 and a protruding portion 23b are provided in this order on the inclined portion 40, and by tightening the screw B from above the protruding portion 23b, the seat frame cover 23 and the bracket 5 are co-tightened to the frame bridge 4. Will be done. Therefore, it is not necessary to separately provide a bracket for fixing the seat frame cover 23, and the number of parts is reduced and the man-hours for mounting work are reduced.

As described above, in the present embodiment, a notch 43 is formed in a part of the frame bridge 4 connecting the pair of left and right seat frames 13, and the bracket 5 is attached so as to straddle the part of the notch 43. It was configured. Further, a relay 29 is attached to the bracket 5 as a vehicle component, and the bracket 5 can be attached to and detached from the frame bridge 4. Thereby, it is possible to improve the assembling property of the vehicle components under the frame bridge 4 and the accessibility to the lower side of the frame bridge 4. Further, it is possible to secure the torsional rigidity of the seat frame 13.

In the above embodiment, the diamond type frame has been described as an example of the vehicle body frame 1, but the present invention is not limited to this configuration. For example, the vehicle body frame 1 may be composed of a twin spar type or cradle type frame.

Further, in the above embodiment, the frame bridge 4 connecting the pair of left and right seat frames 13 has been described as an example, but the present invention is not limited to this configuration. For example, the frame bridge 4 may be configured to connect a pair of main frames 11 or a pair of rear frames 17.

Further, in the above embodiment, the relay 29, the fuel cut sensor 30, and the ECU 31 have been described as examples as vehicle components, but the present invention is not limited to this configuration. In addition, a battery, an ABS unit, an intake system component, and the like may be adopted as vehicle components.

Further, in the above embodiment, the case where the relay 29 is floatingly supported by the bracket 5 via the elastic body 29a has been described, but the present invention is not limited to this configuration. The method of attaching the relay 29 can be appropriately changed, and for example, other methods such as fastening with screws, welding of metals, welding or adhesion of resins, and engagement such as snap fit can be adopted.

Further, in the above embodiment, the notch 43 is formed in the frame bridge 4 (inclined portion 40), but the configuration is not limited to this. A hole may be formed in the frame bridge 4 instead of the notch 43.

Further, in the above embodiment, the case where the bracket 5 is formed of a metal plate has been described, but the present invention is not limited to this configuration. The bracket 5 may be made of, for example, a resin material.

Further, in the above embodiment, the case where the bracket 5 is attached so as to straddle a part of the notch 43 has been described, but the present invention is not limited to this configuration. The bracket 5 may be formed so as to straddle all of the notches 43.

Moreover, although the present embodiment and the modified example have been described, as another embodiment of the present invention, the above-described embodiment and the modified example may be combined in whole or in part.

Further, the embodiment of the present invention is not limited to the above-described embodiment, and may be variously modified, replaced, or modified without departing from the spirit of the technical idea of the present invention. Further, if the technical idea of the present invention can be realized in another way by the advancement of the technology or another technology derived from it, it may be carried out by the method. Therefore, the scope of claims covers all embodiments that may be included within the scope of the technical idea of the present invention.

As described above, the present invention has the effect of improving the assembling property of vehicle components under the frame bridge and the accessibility to the lower side of the frame bridge, and in particular, the frame of a motorcycle. Useful for the structure.

1: Body frame 4: Frame bridge 5: Bracket 10: Head pipe 11: Main frame 12: Down frame 13: Seat frame 14: Front seat (seat)
14a: Bottom surface 14b: Back surface 15: Rear seat (seat)
15a: Horizontal plane 15b: Inclined surface 16: Rear handle 17: Rear frame 18: Footrest bracket 19: 1st rear fender 20: 2nd rear fender 21: Upper side cover 22: Lower side cover 23: Seat frame cover (frame cover)
23a: Side wall 23b: Protruding part 24: Rear frame cover 25: Seat side bridge 26: Fender side bridge 28: Seat striker 29: Relay (vehicle component)
29a: Elastic body 30: Fuel cut sensor 31: ECU
40: Inclined part 41: Horizontal part 42: Leg part 43: Notch 44: Opening 50: Long part 51: Bending part 52: Through hole B: Screw

Claims (4)

A pair of left and right seat frames that extend back and forth below the seats of a motorcycle,
It has an inclined portion that connects the pair of left and right seat frames, is formed in a convex shape on the upper side, and is inclined along the back surface of the seat, and a horizontal portion that is continuous with the rear end of the inclined portion and extends horizontally. With frame bridge,
A bracket for holding a vehicle component placed in the space below the frame bridge.
A notch or a hole is formed in the inclined portion of the frame bridge.
The bracket has a long portion extending in the vehicle width direction and a bent portion extending from the trailing edge of the long portion and bent at a substantially right angle to the long portion, and the rear end of the bent portion. The vehicle component is attached to the part,
The bracket is removable from the frame bridge and is attached to the frame bridge such that the elongated portion straddles at least a portion of the notch or hole.
A frame structure of a motorcycle, characterized in that, in a side view, the vehicle component attached to the bent portion is arranged in a space below the inclined portion and the horizontal portion of the frame bridge . The frame structure of a motorcycle according to claim 1 , wherein the frame bridge faces the back surface of the seat. The frame bridge has a plurality of legs constituting a connection portion with the seat frame.
The frame structure of a motorcycle according to claim 1 or 2 , wherein a predetermined gap is formed between the plurality of legs. Further provided with a frame cover covering the outside of the seat frame,
The frame structure of a motorcycle according to any one of claims 1 to 3 , wherein the frame cover is attached to the frame bridge together with the bracket.

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