JP5494316B2 - Motorcycle body frame - Google Patents

Description

  The present invention relates to a body frame of a motorcycle in which a main frame including a head pipe and a seat frame are configured separately.

  In a body frame of a motorcycle in which a main frame having a head pipe and a seat frame are separate, the main frame has a pair of left and right extending portions extending rearward from the head pipe, and crossed at the rear ends of these extending portions. A member is constructed, and a seat frame attaching portion is formed at the upper part of the rear end of the extending portion, and the body frame is constituted by attaching the seat frame to the seat frame attaching portion.

  When the seat frame is mounted, as shown in Patent Document 1, the outer surface of the seat frame mounting portion is used as a mounting surface, and the inner surface of the front end portion of the seat frame is brought into contact with the mounting surface. Is fastened and fixed to the seat frame mounting portion with fastening bolts.

JP 2000-72076 A

  However, in the seat frame mounting structure as disclosed in Patent Document 1, the welded portion between the extended portion of the main frame and the cross member is in a position close to the seat frame mounting portion in the vehicle width direction. For this reason, when welding the cross member, it is necessary to adjust the shape and operating area of the welding device so that the welding device such as a welding gun does not interfere with the seat frame mounting portion. End up.

  An object of the present invention is to provide a vehicle body frame of a motorcycle that can improve the weldability of a cross member in a main frame in consideration of the above-described circumstances.

  In the present invention, a pair of left and right extending portions extend rearward from the head pipe, and a swing arm pivot supporting portion for supporting a rear wheel is provided at a portion extending downward from the rear end of these extending portions. A main frame in which a cross member is connected to a pair of left and right cross member connecting portions formed at least at the upper rear end of the portion, and the left and right extending portions are coupled, and the rear of the extending portion of the main frame A body frame of a motorcycle having a seat frame attached to a pair of left and right seat frame attachment portions formed at an upper end and extending rearward, wherein a seat frame attachment surface is formed on an inner side in the vehicle width direction of the seat frame attachment portion The cross member connecting portion protrudes in a direction approaching to the inside in the vehicle width direction with respect to the seat frame mounting surface, and is disposed in front of the seat frame mounting portion. The front end portion of the seat frame is fastened and fixed by a tightening bolt inserted from the outside of the seat frame mounting portion in a state where the outer surface of the front end portion of the seat frame is in contact with the seat frame mounting surface. It is what.

  According to the present invention, the seat frame mounting surface is formed on the inner side in the vehicle width direction of the seat frame mounting portion in the main frame, and the cross member connecting portion is provided so as to protrude inward in the vehicle width direction from the seat frame mounting surface. The welding location for connecting the cross member to the cross member connecting portion is separated from the seat frame attaching portion. Therefore, when the cross member is welded to the cross member connecting portion, it is possible to prevent the welding apparatus from interfering with the seat frame mounting portion, so that the weldability of the cross member in the main frame can be improved.

1 is a left side view showing a motorcycle to which an embodiment of a body frame of a motorcycle according to the present invention is applied. Fig. 2 is a left side view showing a body frame of the motorcycle shown in Fig. 1. FIG. 3 is a partial plan view taken along arrow III in FIG. 2. FIG. 4 is a partial plan view showing a situation in which a seat frame is attached to the main frame of FIG. 3. The V arrow line view of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to these embodiments.

  FIG. 1 is a left side view showing a motorcycle to which an embodiment of a body frame of a motorcycle according to the present invention is applied. In the present embodiment, expressions such as up / down, left / right, and front / rear are based on the driver when riding the vehicle.

  A motorcycle 10 shown in FIG. 1 is a so-called sports-type vehicle in which the front side of the vehicle is covered with a streamlined exterior cover (described later). In the motorcycle 10, a main frame 11 extending in the front-rear direction is disposed in the front half of the vehicle, and a head pipe 12 is provided at the front end of the main frame 11. A steering shaft (not shown) is pivotally supported on the head pipe 12 so as to be rotatable to the left and right, and a front wheel 13 is suspended from the steering shaft via a pair of left and right front forks 9. Above the head pipe 12, a handle 14 is connected to the steering shaft so as to rotate together, and the front wheel 13 can be rotated left and right by steering the handle 14. A fuel tank 15 that stores fuel supplied to the engine 16 is disposed above the main frame 11.

  An engine 16 is suspended under the main frame 11, and an air cleaner 17 is connected to the engine 16 via an intake pipe 18 above the engine 16 and in front of the fuel tank 15. Outside air (air) is introduced into the air cleaner 17 from an air duct 19. The outside air introduced from the air duct 19 is purified in the air cleaner 17, mixed with fuel from a carburetor or a fuel injection device (not shown), and supplied to the engine 16.

  Further, exhaust gas from the engine 16 is discharged to the rear of the vehicle by an exhaust pipe (not shown) connected to the front portion of the engine 16 and extending rearward and downward, and a silencer 20 connected to the rear end of the exhaust pipe. The

  A front end of the swing arm 21 is pivotally supported at the lower rear portion of the main frame 11 so as to be swingable in the vertical direction. A rear wheel 22 is rotatably supported at the rear end of the swing arm 21. The power of the engine 16 is transmitted to the rear wheel 22 by a drive chain 23 or the like.

  As shown in FIG. 2, a seat frame 24 extends rearwardly and upwardly on the upper rear portion of the main frame 11 as will be described in detail later. A load acting on the front seat 25 and the rear seat 26 is supported by the seat frame 24. The main frame 11 and the seat frame 24 are made of, for example, an aluminum alloy material, and the body frame 30 of the motorcycle 10 is configured by including the main frame 11 and the seat frame 24.

  As shown in FIG. 1, the exterior cover is disposed in front of the main frame 11 and has a streamlined front cover 31 that covers the front of the vehicle, a side cover 32 that covers the side of the vehicle, and a lower cover 33 that covers the bottom of the vehicle. And an engine side cover 34 that covers the side surface of the engine 16 and a rear cover 35 that covers the seat frame 24. A headlight 36 as a headlamp is disposed at the front end of the front cover 31, and an air inlet 37 is formed on both outer sides of the headlight 36 in the vehicle width direction. The air inlet 37 is connected to the air duct 19.

  2 and 3, the main frame 11 includes a main frame front end portion 38 disposed on the front side, and a pair of left and right main frame rear end portions 39A joined to the rear portion of the main frame front end portion 38. 39B. The main frame front end portion 38 and the main frame rear half portions 39A and 39B are molded by, for example, casting, and then joined together by a joining method such as welding.

  The main frame front end portion 38 is integrated with the head pipe 12 at the front portion, and a pair of left and right extending portion first halves 40 are extended from immediately after the head pipe 12 to the rear. Further, the hanging portion 41 is suspended from the lower surface of the first half 40 of the extending portion. The extension part first half 40 and a later-described extension part second half 42 function as a tank rail part that supports the load of the fuel tank 15 (FIG. 1).

  The main frame rear half portions 39A and 39B each have a rear extension portion 42 extending rearward from a joint portion of the main frame front end portion 38 with the extension front half 40, and further downward from the rear end of the extension rear half 42. The swing arm bracket portion 43 is bent and integrally formed. Further, a stay portion 44 is integrally extended from the lower surface of the extended portion rear half 42 of the main frame rear half portions 39A and 39B, and this stay portion 44 is joined to the hanging portion 41 of the main frame front half portion 38 by welding or the like. . Further, the swing arm bracket portion 43 is formed with a pivot portion 45 for pivotably supporting the swing arm 21.

  A pair of left and right cross member connecting portions 46 are integrally formed at the rear end upper portion of the extended portion latter half 42 in the main frame latter half portions 39A and 39B. A cross member 47 extending in the vehicle width direction is connected to these cross member connecting portions 46 by, for example, welding. Furthermore, a pair of left and right cross member connecting portions (not shown) are integrally formed at the lower end of the swing arm bracket portion 43, and a cross member 48 extending in the vehicle width direction is welded to these cross member connecting portions, for example. Connected by These cross members 47 and 48 increase the rigidity of the main frame 11.

  An engine suspension 49 for suspending the engine 16 is provided on the hanging portion 41 of the main frame front half 38 and the swing arm bracket 43 of the main frame rear half 39A and 39B.

  Seat frame attachment portions 50 and 51 for attaching the seat frame 24 are integrally projected from the rear end upper portion of the extended portion latter half 42 in each of the main frame latter half portions 39A and 39B. As shown in FIGS. 4 and 5, the pair of left and right seat frame mounting portions 50 and the pair of left and right seat frame mounting portions 51 are both formed as seat frame mounting surfaces 53 </ b> A on the inner side surface in the vehicle width direction. In the seat frame attachment portions 50 and 51, the seat frame attachment surface 53A is substantially flush with a portion other than the seat frame attachment surface 53A (that is, the base portion 53B of the seat frame attachment portions 50 and 51), or more vehicle than the base portion 53B. It protrudes inward in the width direction. In the seat frame attachment portions 50 and 51 of the present embodiment, the seat frame attachment surface 53A is provided so as to protrude inward in the vehicle width direction from the base portion 53B.

  Bolt insertion holes 54 are formed in the seat frame mounting portions 50 and 51. As shown in FIGS. 2 to 4, the seat frame 24 is connected to a pair of left and right seat rails 55 by linking a plurality of bridges 56, and bolts are inserted into front end portions 57 and 58 of the seat rails 55. Each hole 59 is formed.

  The outer surface 60A of the front end portions 57 and 58 of the seat frame 24 is in contact with the seat frame mounting surfaces 53A of the seat frame mounting portions 50 and 51 in the main frame 11 from the outside of the seat frame mounting portions 50 and 51. The fastening bolt 61 is inserted into the bolt insertion holes 54 and 59, and the fastening bolt 61 fixes the front end portions 57 and 58 of the seat frame 24 to the seat frame mounting portions 50 and 51 of the main frame 11, respectively. A seat frame 24 is attached to the main frame 11.

  At this time, the axis O of the fastening bolt 61 inserted through the seat frame mounting portions 50 and 51 of the main frame 11 and the front end portions 57 and 58 of the seat frame 24 is in the horizontal direction. On the other hand, in the seat frame 24, the axis P of the fastening bolt 62 for fastening and fixing the bridge 56 to the pair of seat rails 55 is in the vertical direction and is orthogonal to the axis O of the fastening bolt 61. The tightening bolt 62 is inserted into a long hole 63 formed in the bridge 56 and extending in the vehicle width direction, for example, and is loosened, so that the distance L between the pair of seat rails 55 can be adjusted.

  Here, as shown in FIGS. 4 and 5, a welding device (for example, a welding gun) is used for the both ends of the cross member 47 over the entire circumference of the pair of left and right cross member connecting portions 46 in the main frame 11. Connected by welding. At this time, the welding point M between the cross member connecting portion 46 and the cross member 47 is set on the inner side in the vehicle width direction with respect to the seat frame attaching surface 53A of the seat frame attaching portions 50 and 51 of the main frame 11. Accordingly, the cross member connecting portion 46 is integrally provided so as to protrude from the extended portion latter half 42 of the main frame latter half portions 39A and 39B to the welding location M in the direction of approaching each other in the vehicle width direction.

  With the configuration as described above, the following effects (1) to (5) are achieved according to the present embodiment.

  (1) A seat frame mounting surface 53A is formed on the inner side in the vehicle width direction of the seat frame mounting portions 50, 51 in the main frame 11, and the cross member connecting portion 46 is closer to the inner side in the vehicle width direction than the seat frame mounting surface 53A. It protrudes in the direction to do. For this reason, the welding location M at which the cross member 47 is connected to the cross member connecting portion 46 is positioned away from the seat frame attaching portions 50 and 51 inward. Therefore, when the cross member 47 is welded to the cross member connecting portion 46 over the entire circumference, it is possible to prevent the welding apparatus (for example, a welding gun) from interfering with the seat frame attaching portions 50 and 51. The weldability of the cross member 47 can be improved.

  (2) A seat frame mounting surface 53A is formed on the inner side in the vehicle width direction of the seat frame mounting portions 50, 51 in the main frame 11, and the outer surfaces 60A of the front end portions 57, 58 in the seat rail 55 of the seat frame 24 are the seat frame. Since the seat frame 24 is attached to the seat frame attachment portions 50 and 51 of the main frame 11 in contact with the attachment surface 53A, the width L in the vehicle width direction of the seat frame 24 can be reduced. For this reason, since the seat frame 24 can be reduced in size and weight, the weight of the motorcycle 10 can be concentrated on the center side in the vehicle width direction.

  (3) Since the seat frame mounting surface 53A is formed on the inner side in the vehicle width direction of the seat frame mounting portions 50 and 51 in the main frame 11, the distance (pitch) in the vehicle width direction between these seat frame mounting portions 50 and 51. Can be enlarged. Therefore, the strength of the seat frame mounting portions 50 and 51 that support the seat frame 24 can be sufficiently secured against bending and twisting acting on the seat frame 24.

  (4) In the seat frame attachment portions 50 and 51 in the main frame 11, the seat frame attachment surface 53A is substantially flush with the base portion 53B other than the seat frame attachment surface 53A, or protrudes inward in the vehicle width direction from the base portion 53B. Is provided. For this reason, in order to attach the seat frame 24 to the seat frame attaching portions 50 and 51, the front end portions 57 and 58 of the seat rail 55 of the seat frame 24 are brought close to the seat frame attaching portions 50 and 51 of the main frame 11. The interference between the front end portions 57 and 58 and the seat frame mounting portions 50 and 51 can be prevented. As a result, the assembly work (attachment work) of the seat frame 24 can be facilitated.

  (5) In the seat frame 24, the shaft P of the fastening bolt 62 for fastening and fixing the bridge 56 to the seat rail 55 has the front end portions 57 and 58 of the seat frame 24 at the seat frame mounting portions 50 and 51 of the main frame 11. It is orthogonal to the axis O of the fastening bolt 61 for attaching to the shaft. Therefore, after the seat frame 24 is fastened and fixed to the seat frame mounting portions 50 and 51 of the main frame 11 by the fastening bolt 61, the fastening bolt 62 in the seat frame 24 is loosened to bridge the seat rail 55 of the seat frame 24. The position L can be adjusted in the vehicle width direction with respect to 56, and the distance L between the seat rails 55 can be changed. As a result, distortion and deformation that occur in the seat frame 24 when the seat frame 24 is attached to the main frame 11 can be easily eliminated.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.

  For example, in the above embodiment, the extending portion functioning as the tank rail portion is separated into the extending portion first half 40 of the main frame front end portion 38 and the extending portion latter half 42 of the main frame rear end portions 39A and 39B. And then what was joined and configured. On the other hand, a pair of left and right extending portions extending rearward from the head pipe 12 are integrally formed as tank rail portions, and a pivot portion 45 for pivotal support of the swing arm 21 is provided at the lower rear end of these tank rail portions. The present invention may be applied to a main frame in which the swing arm bracket portion 43 is joined by welding and the cross member connecting portion 46 and the seat frame attaching portions 50 and 51 are formed at the upper rear end of the tank rail. .

DESCRIPTION OF SYMBOLS 10 Motorcycle 11 Main frame 12 Head pipe 21 Swing arm 22 Rear wheel 24 Seat frame 30 Body frame 40 Extension part front half 42 Extension part latter half 43 Swing arm bracket part 45 Pivot part 46 Cross member connection part 47 Cross members 50 and 51 Seat frame mounting portion 53A Seat frame mounting surface 55 Seat rail 56 Bridge 57, 58 Front end portion 60A Outer side surface 61, 62 Tightening bolt O, P shaft

Claims (3)

A pair of left and right extending portions extend rearward from the head pipe, and a pivotal support portion of a swing arm that supports a rear wheel is provided at a portion extending downward from the rear end of these extending portions, and at least behind the extending portions. A main frame in which a cross member is connected to a pair of left and right cross member connecting portions formed at an upper end, and the left and right extending portions are coupled;
In a vehicle body frame of a motorcycle having a seat frame attached to a pair of left and right seat frame attachment portions formed on the rear end upper portion of the extension portion of the main frame and extending rearward,
A seat frame mounting surface is formed on the inner side in the vehicle width direction of the seat frame mounting portion,
The cross member connecting portion protrudes in a direction approaching each other in the vehicle width direction from the seat frame mounting surface,
With the outer surface of the front end portion of the seat frame in contact with the seat frame mounting surface of the seat frame mounting portion, the front end portion of the seat frame is moved by a fastening bolt inserted from the outside of the seat frame mounting portion. A motorcycle body frame characterized by being fastened and fixed. In the seat frame mounting portion, the seat frame mounting surface is provided so as to be substantially flush with a portion other than the seat frame mounting surface, or to protrude inward in the vehicle width direction from a portion other than the seat frame mounting surface. The body frame of the motorcycle according to claim 1. The seat frame includes a pair of left and right seat rails and a plurality of bridges that connect the seat rails, and the seat rails and the bridges are tightened to be inserted into seat frame mounting portions of the main frame. 2. The body frame of a motorcycle according to claim 1, wherein the body frame is fixed by fastening bolts having an axis in a direction perpendicular to the axis of the attached bolt.

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