JP2019137153A - Motor cycle frame structure - Google Patents

Abstract

To improve assemblability of vehicle components below a frame bridge and accessibility to an area below the frame bridge.SOLUTION: The invention includes: a pair of left and right seat frames (13) extending in a fore and aft direction below a seat of a motor cycle; a frame bridge (4) connecting the pair of left and right seat frames; and a bracket (5) which holds vehicle components disposed in a space below the frame bridge. A cutout (43) is formed in a part of the frame bridge. The bracket can be attached to or detached from the frame bridge and is attached to the frame bridge so as to cross at least a part of the cutout.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a motorcycle frame structure.

  In some motorcycles, predetermined functional parts are arranged in a lower space of a pair of frames extending in the front-rear direction. For example, a motorcycle described in Patent Document 1 is a fuel cell vehicle, and a fuel supply system including a fuel tank or the like is disposed 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 disposed below the cross member. The cross member is fixed to the pair of frames, for example, by welding.

JP 2017-114213 A

  However, in Patent Document 1, there is a problem that the cross member is fixed to the pair of frames, thereby affecting the assembling property 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 that can improve the assembling property of vehicle components below the frame bridge and the accessibility to the lower side of the frame bridge. For the purpose.

  A motorcycle frame structure according to an aspect of the present invention includes a pair of left and right seat frames extending forward and backward under a seat of the motorcycle, a frame bridge connecting the pair of left and right seat frames, and a space below the frame bridge. A bracket for holding the vehicle component to be arranged, the frame bridge is partially cut or formed with a hole, and the bracket is detachable from the frame bridge. It attaches to the said frame bridge so that at least one part of a notch or a hole may be straddled.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly property of the vehicle component in the downward direction of a frame bridge, and the accessibility to the downward direction of a frame bridge can be improved.

1 is a left side view showing a schematic configuration of a frame structure of a motorcycle according to the present embodiment. It is a longitudinal cross-sectional view around a seat frame. It is the perspective view which expanded the peripheral structure of the seat frame. It is the figure which abbreviate | omitted the seat frame cover from FIG. It is an enlarged view of the bracket holding 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 a motorcycle according to the present invention may be applied to other types of motorcycles, buggy type motorcycles and the like. Regarding the direction, the front of the vehicle is indicated by an arrow FR, and the rear of the vehicle is indicated by an arrow RE. In the following drawings, a part of the configuration is 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 body frame 1. The body frame 1 is, for example, a diamond frame made of steel or aluminum alloy, and suspends the 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 that extends rearward from the upper end of the head pipe 10, and a down frame 12 that extends downward from a substantially axial center of the head pipe 10.

  The main frame 11 is slightly inclined downward toward the rear, and branches right and left in the middle. Each of the main frames 11 branched to the left and right is bent downward and extends to the lower rear of the engine. The rear part of the engine is supported by the main frame 11. The down frame 12 includes a suspension for suspending a 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 as it goes rearward. A front seat 14 and a rear seat 15 are provided above the seat frame 13 from the front side. Passenger rear handles 16 are attached to the left and right of the rear seat 15.

  Also, in the pair of left and right main frames 11, a pair of rear frames 17 extending rearward and upward are welded in the middle of a portion extending downward. The rear end of the rear frame 17 is connected to the rear portion of the seat frame 13 from below. In the middle of the rear frame 17, a passenger's footrest bracket 18 extending in a V shape when viewed from the side is connected to the rear frame 17. A first rear fender 19 is provided at the rear half of the pair of left and right rear frames 17 so as to cover the frame from below. A rear rear end of the first rear fender 19 is provided with a second rear fender 20 that extends rearward and covers an upper portion of a rear wheel (not shown).

  Although details will be described later, predetermined vehicle components are disposed in a space surrounded by the pair of left and right seat frames 13 and the rear frame 17.

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

  Next, the frame structure of the motorcycle will be described in detail with reference to FIGS. FIG. 2 is a longitudinal 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 view in which the seat frame cover is omitted from FIG. FIG. 5 is an enlarged view of a bracket for holding a vehicle component.

  As shown in FIGS. 2 to 4, a pair of left and right seat frames 13 in the vicinity of the boundary between the front seat 14 and the rear seat 15 is welded with a frame bridge 4 that connects the two. The torsional rigidity of the seat frame 13 is enhanced by the frame bridge 4. 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 a rear end portion of the lower surface 14a. The back surface 14b of the front seat 14 is inclined upward as it goes rearward. The front seat 14 has a lower surface 14 a supported by a pair of left and right seat frames 13 and a rear surface 14 b supported by the frame bridge 4. As for the lower surface of the rear seat 15, a front half portion is a horizontal surface 15a, and a rear half portion is an inclined surface 15b that gently slopes upward as it goes rearward. The horizontal surface 15 a of the rear seat 15 is supported by the frame bridge 4.

  In addition, a seat side bridge 25 and a fender side bridge 26 are also welded to the rear ends of the pair of left and right seat frames 13. The seat side bridge 25 and the fender side bridge 26 also increase the torsional rigidity of the seat frame 13.

  The seat-side bridge 25 located on the upper side of 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 on 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 that supports 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 rear end portion of the first rear fender 19 is supported by the lower surface of the fender-side bridge 26.

  Here, a 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 the facing distance between the pair of left and right seat frames 13 and a predetermined front-rear width. More specifically, the frame bridge 4 includes an inclined portion 40 that is inclined along the back surface 14b of the front seat 14 in a side view, a horizontal portion 41 that extends horizontally from the rear end of the inclined portion 40, and four corners on the front, rear, left, and right. A plurality of (four in this embodiment) leg portions 42 formed.

  The inclined portion 40 is inclined upward as it goes rearward in the same manner as the back surface 14 b of the front seat 14. Further, the inclined portion 40 has a notch 43 formed in the center portion in the vehicle width direction. Thereby, 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 front portion 14 and the front seat 14. The horizontal portion 41 faces the horizontal surface 15a of the rear seat 15, and supports the horizontal surface 15a of the rear seat 15 via a seat striker 28 provided on the upper surface.

  The four leg portions 42 constitute a connection portion with the pair of left and right seat frames 13, and the two leg portions 42 arranged in the front-rear direction per one seat frame 13 are welded. A gap corresponding to the facing distance between the pair of left and right seat frames 13 is formed between the two leg portions 42 arranged side by side. Moreover, the opening 44 is formed in the right-and-left both sides | surfaces of the frame bridge 4, and the predetermined clearance gap is formed between the two leg parts 42 located in front and back. The number of leg portions 42 is not limited to four, and can be changed as appropriate.

  A 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 includes a relay 29, a fuel cut sensor 30, an ECU 31 (Electronic Control Unit) as vehicle components. Electrical components such as are arranged. In particular, the relay 29 is disposed in a lower space formed by the frame bridge 4 bulging upward. More specifically, the relay 29 is positioned 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 in a side view. Although 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-like 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 disposed below the seat frame 13 in a side view and are held on the upper surface side of the second rear fender 20. More specifically, the fuel cut sensor 30 is disposed immediately below the relay 29, and the ECU 31 is disposed below the relay 29.

  By the way, in a motorcycle, when a vehicle component such as an electrical component is disposed in a limited space surrounded by a frame, the assembling property of the vehicle component and the accessibility to the space have been problems. For example, it is assumed that the frame bridge that connects the pair of left and right seat frames becomes an obstacle, making it difficult to assemble the vehicle component parts below the frame bridge and to access the lower part of the frame bridge. The

  Accordingly, the inventors of the present invention have focused on the shape of the frame bridge and have come 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. In this manner, the plate-like bracket 5 is attached. The bracket 5 holds a relay 29 arranged in a space below the frame bridge 4 and is configured to be detachable from the frame bridge 4.

  According to this configuration, the relay 29 can be easily disposed 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 detached from the frame bridge 4 together with the relay 29. As a result, the notch 43 of the frame bridge 4 is opened, and the space below the frame bridge 4 can be accessed 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 includes a long portion 50 that extends in the vehicle width direction (left-right direction) and a pair of bent portions 51 that extend from the rear edge portion of the long portion 50 and are bent substantially at right angles to the long portion 50. And having.

  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. At both ends of the long portion 50, through holes 52 for inserting the fixing screws B are formed. Note that screw holes (not shown) are formed at both ends of the inclined portion 40 so as to correspond 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 and right widths of the bent portions 51 are set to be 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 has a generally rectangular parallelepiped shape, and the outside is covered with a complementary elastic body 29a. The elastic body 29a is made of rubber or the like, for example. The upper surface of the elastic body 29a protrudes one step above the bent portion 51, and a slit (not shown) for inserting the bent portion 51 is formed in the protruded portion. By inserting the bent portion 51 through the slit, the relay 29 can be supported in a floating manner, and vibration transmission to the relay 29 is suppressed. 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 a state where the relay 29 is attached to the bracket 5, as shown in FIG. 2, the back surface of the long portion 50 and the front surface of the relay 29 (elastic body 29a) are opposed to each other. As shown in FIG. 4, in the state where the two relays 29 are arranged side by side, the left and right widths of the two relays 29 (including the elastic body 29 a) are smaller than the left and right widths of the notches 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. Thus, the workability of attaching and detaching the bracket 5 and the relay 29 is improved.

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

  In addition, since a predetermined gap is formed between the plurality of leg portions 42 constituting the connecting portion with the seat frame 13, an air escape path around the electrical component can be secured, and 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 together. 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 includes 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). On the inclined portion 40, a long portion 50 and a protruding portion 23b are provided in this order. By tightening the screw B from above the protruding portion 23b, the seat frame cover 23 and the bracket 5 are fastened to the frame bridge 4 together. Is done. Therefore, it is not necessary to provide a separate bracket for fixing the seat frame cover 23, and the number of parts and the number of installation work steps are reduced.

  As described above, in the present embodiment, the notch 43 is formed in a part of the frame bridge 4 that connects the pair of left and right seat frames 13, and the bracket 5 is attached so as to straddle a part of the notch 43. The configuration. In addition, a relay 29 is attached to the bracket 5 as a vehicle component so that 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 component parts below the frame bridge 4 and the accessibility to the lower side of the frame bridge 4. In addition, the torsional rigidity of the seat frame 13 can be ensured.

  In the above embodiment, a 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 body frame 1 may be a twin spar type or cradle type frame.

  In the above embodiment, the frame bridge 4 that connects the pair of left and right seat frames 13 is 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 the pair of main frames 11 or the pair of rear frames 17.

  Moreover, in the said embodiment, although the relay 29, the fuel cut sensor 30, and ECU31 were demonstrated as an example of vehicle components, it is not limited to this structure. In addition, a battery, an ABS unit, an intake system component, or the like may be employed as the vehicle component.

  Moreover, although the said embodiment demonstrated the case where the relay 29 was floatingly supported by the bracket 5 via the elastic body 29a, it is not limited to this structure. The attachment method of the relay 29 can be appropriately changed. For example, other methods such as fastening with screws, welding between metals, welding or adhesion between resins, and snap fitting can be employed.

  Moreover, in the said embodiment, although it was set as the structure by which the notch 43 is formed in the frame bridge 4 (inclination part 40), it is not limited to this structure. A hole may be formed in the frame bridge 4 instead of the notch 43.

  Moreover, although the said embodiment demonstrated the case where the bracket 5 was formed with a metal plate, it is not limited to this structure. The bracket 5 may be made of, for example, a resin material.

  Moreover, although the said embodiment demonstrated the case where the bracket 5 was attached so that a part of notch 43 might be straddled, it is not limited to this structure. The bracket 5 may be formed so as to straddle all of the notches 43.

  Moreover, although this Embodiment and the modified example were demonstrated, what combined the said embodiment and modified example entirely or partially as another embodiment of this invention may be sufficient.

  The embodiments of the present invention are not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea of the present invention. Furthermore, if the technical idea of the present invention can be realized in another way by technological advancement or other derived technology, the method may be used. Accordingly, the claims cover all embodiments that can be included within the scope of the technical idea of the present invention.

  As described above, the present invention has an effect that it is possible to improve the assembling property of the vehicle component parts below the frame bridge and the accessibility to the lower side of the frame bridge, and in particular, the frame of the motorcycle. Useful for 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: lower surface 14b: back surface 15: rear seat (seat)
15a: Horizontal surface 15b: Inclined surface 16: Rear handle 17: Rear frame 18: Footrest bracket 19: First rear fender 20: Second rear fender 21: Upper side cover 22: Lower side cover 23: Seat frame cover (frame cover)
23a: Side wall part 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 (5)

A pair of left and right seat frames extending back and forth under the seat of the motorcycle;
A frame bridge connecting the pair of left and right seat frames;
A bracket for holding vehicle components arranged in a lower space of the frame bridge,
The frame bridge has a notch or a hole formed in part,
The frame structure of a motorcycle, wherein the bracket is detachable from the frame bridge and is attached to the frame bridge so as to straddle at least a part of the notch or the hole.   The motorcycle frame structure according to claim 1, wherein the frame bridge is formed in a convex shape upward.   The motorcycle frame structure according to claim 1, wherein the frame bridge faces a back surface of the seat. The frame bridge has a plurality of legs constituting a connection portion with the seat frame,
The motorcycle frame structure according to any one of claims 1 to 3, wherein a predetermined gap is formed between the plurality of leg portions. A frame cover that covers the outside of the seat frame;
The motorcycle frame structure according to any one of claims 1 to 4, wherein the frame cover is attached to the frame bridge together with the bracket.

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