JP5663355B2 - Motorcycle body frame - Google Patents

Description

  The present invention relates to a technique for improving a body frame of a motorcycle.

  There is known a body frame of a motorcycle having a structure in which a pipe material and a metal plate material are joined and integrated by welding (see, for example, Patent Document 1 (FIG. 2)).

As shown in FIG. 2 of Patent Document 1, tail pipes (9, 9) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) are arranged on the left and right sides in the vehicle width direction. The tail pipes (9, 9) each extend rearward of the vehicle, and two cross members are passed between the left and right tail pipes (9, 9).
However, since these two cross members are flat plates, the rigidity of the rear part of the vehicle body frame cannot be sufficiently increased, and there is room for improvement.
An improved technique with respect to Patent Document 1 will be described next.

  A motorcycle body frame having a structure in which press-molded metal plates are joined and integrated by welding is known (see, for example, Patent Document 2 (FIG. 5)).

As shown in FIG. 5 of Patent Document 2 , the main frame (30) as a component of the vehicle body frame (21) (the numbers in parentheses indicate the reference numerals described in Patent Document 2. The same shall apply hereinafter) is made by pressing the plate material. The upper member (31) and the lower member (32), which are molded and have a U-shaped cross section, are joined to each other so as to have a substantially cross-shaped cross section by abutting vertically. The main frame (30) is extended to the rear of the vehicle. The upper member (31) and the lower member (32) are butt-joined and joined together to increase the rigidity of the seat rail portion that supports the seat. However, a cross member cannot be provided in the seat rail portion.

  It is suitable if there is a technique capable of passing a rigid cross member between the left and right seat rails and increasing the rigidity of the seat rails while making the left and right seat rails into press frames. .

Japanese Patent No. 3060487 Japanese Patent No. 4153104

  It is an object of the present invention to provide a technique that can increase the rigidity of a seat rail in a body frame that is formed of a press-formed product and that has a pair of seat rails extending in the left-right direction in the vehicle width direction.

The invention according to claim 1 includes a head pipe, a main frame that extends from the head pipe to the rear of the vehicle and then extends downward, and a pair of left and right seat rails that extend from the main frame to the rear of the vehicle and support the seat. In the motorcycle body frame, the pair of left and right seat rails are pressed metal plates, each of the left and right main members having an open portion that opens inward in the vehicle width direction, and the left and right open portions, respectively. A pair of left and right seat rails, each having upper and lower flanges to which the left and right sub-members are abutted and welded to the upper end in the height direction of the left and right main members. A cross member is provided between the pair of left and right seat rails,
This cross member is a pressed metal plate, and left and right cross member bent portions extending in the vehicle longitudinal direction and bent upward are provided at the left and right ends of the cross member in the vehicle width direction. The cross member bent portion is joined to the upper flange portion, and the left and right submembers are divided into left and right front submembers and left and right rear submembers positioned on the vehicle rear side of each of the left and right front submembers. The cross member is provided so as to straddle the divided part of the left and right front submembers and the left and right rear submembers .

  In the invention according to claim 2, the left and right cross member bent portions and the upper flange portion are simultaneously joined by spot welding when the left and right submembers are welded to the left and right main members, respectively. It is characterized by.

  The invention according to claim 3 is characterized in that the cross member includes at least one of a front end and a rear end in the vehicle longitudinal direction and a width direction bent portion extending in the vehicle width direction.

  In the invention according to claim 4, the cross member is provided with a fuel tank fastening portion for fastening the rear end of the fuel tank supported by the vehicle body frame, and the fuel tank fastening portion is provided at a substantially central position in the vehicle width direction. A bulging portion that bulges upward is provided.

In the invention according to claim 1, since the left and right cross member bent portions extending in the longitudinal direction of the vehicle are provided at the left and right ends of the cross member, the rigidity of the cross member is increased.
In addition, since the left and right cross member bent portions are bent upward, the cross member can be disposed closer to the torsional center point of the seat rail than the structure bent downward. As a result, the torsional rigidity of the seat rail can be increased.
Further, a cross member is provided so as to straddle the divided portion of the front sub-member and the rear sub-member. Since the divided portion can be reinforced by straddling the divided portion with the cross member, the rigidity of the entire body frame can be increased.

In the invention according to claim 2, when the left and right submembers are welded to the left and right main members, the left and right cross member bent portions are simultaneously welded to the left and right main members.
By welding the main member, the sub member and the cross member at the same time, the number of welding processes can be reduced and the welding time can be reduced as compared with the case where the cross member bent portion is welded after welding the sub member to the main member. it can.

  In the invention according to claim 3, the cross member includes a width-direction bent portion extending in the vehicle width direction. By providing the width direction bent portion, the rigidity of the cross member can be further increased. By increasing the rigidity of the cross member, the rigidity of the body frame can be increased.

In the invention which concerns on Claim 4, the fuel tank fastening part is provided in the cross member, and the bulging part is provided in this fuel tank fastening part.
By forming the bulging portion on the cross member, the rigidity of the cross member can be further increased as compared with the case where the bulging portion is not formed. By increasing the rigidity of the cross member, the rigidity of the entire body frame can be increased.

1 is a left side view of a motorcycle according to the present invention. Fig. 3 is a left side view of a body frame of the motorcycle. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a top view of the 1st cross member which comprises a vehicle body frame. It is a perspective view of the 1st cross member which comprises a body frame. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 5. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 5. It is a top view of the 2nd cross member which comprises a body frame. It is a perspective view of the 2nd cross member which comprises a body frame. FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. 9.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “up”, “down”, “front”, “rear”, “left”, and “right” respectively indicate directions viewed from the driver who rides the motorcycle. The drawings are viewed in the direction of the reference numerals.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a motorcycle 10 includes a body frame 11, a front fork 13 provided on a head pipe 12 included in the body frame 11 so as to be steerable, and a front wheel 14 attached to a lower end of the front fork 13. A handle 15 attached to the upper part of the front fork 13, a fuel tank 16 attached to the upper part of the front part of the vehicle body frame 11, and a power unit 21 having an engine 17 and a transmission 18 disposed below the fuel tank 16 are provided. It has been.

  A seat 22 is attached to the rear upper part of the body frame 11, a swing arm 23 is attached to the lower part of the body frame 11 so as to be swingable, and a rear wheel 24 is attached to the rear end of the swing arm 23. A rear cushion unit 25 is passed between the rear portions of the vehicle body frame 11.

  A headlamp 27 is disposed in front of the head pipe 12, and a front fender 28 that covers the upper portion of the front wheel 14 and is attached to the front fork 13 is provided on the front fork 13. A throttle body 31 is provided at the upper rear portion of the engine 17. A tail lamp 32 is disposed behind the seat 22, and a rear fender 33 that covers the upper portion of the rear wheel 24 is provided below the tail lamp 32. The throttle body 31 may be a carburetor.

Next, the structure of the body frame will be described.
As shown in FIG. 2, the vehicle body frame 11 includes a head pipe 12, a main frame 41 that extends downward from the head pipe 12 and then extends downward, and a pivot that is fixed to the rear end of the main frame 41. A frame 42; a down frame 43 extending from the front of the main frame 41 and the head pipe 12 diagonally downward and rearward; a pair of left and right seat rails 44L extending from the main frame 41 to the rear of the vehicle and supporting the seat 22; 44R (only the reference numeral 44L on the front side of the figure is shown). An engine hanger 45 that supports the engine 17 is fixed to the lower end portion of the down frame 43.

  The main frame 41 includes a main frame front half 47 extending rearward from the head pipe 12 and a main frame rear half 48 extending downward from the main frame front half 47. A convex portion 49 bulging outward in the vehicle width direction is integrally provided in the main frame front half portion 47. A pivot frame 42 is attached to the lower end of the main frame rear half 48.

  The seat rails 44L and 44R are rail bodies 51L and 51R (only the reference numeral 51L on the front side in the figure is shown) that extends substantially horizontally from the boundary 53 between the main frame front half 47 and the main frame rear half 48 to the rear of the vehicle. Sub-frames 52L, 52R (only the reference numeral 52L on the front side of the figure is shown) extending from the vicinity of the rear cushion support portion 54 provided on each of the rail bodies 51L, 51R toward the pivot frame 42 obliquely forward and downward in the vehicle. It is constructed integrally.

  That is, rail main bodies 51L and 51R that support the seat (FIG. 1, reference numeral 22) extend from the main frame 41, and the sub frames 52L and 52R are passed between the rail main bodies 51L and 51R and the pivot frame. The seat rails 44L and 44R are members that are substantially Y-shaped with the rail bodies 51L and 51R and the sub frames 52L and 52R in a side view of the vehicle. Each component of the body frame 11 is a hollow frame made of a press-molded metal plate.

Next, the structure when the body frame is viewed from above will be described.
As shown in FIG. 3, one main frame 41 extends from the head pipe 12 toward the rear of the vehicle, and the front ends of the left and right seat rails 44L, 44R are joined to the left and right side surfaces 41L, 41R of the main frame 41. The left and right seat rails 44L, 44R are extended to the rear of the vehicle with the front portion extending outward in the vehicle width direction, and the first cross member 55 is passed between the left and right seat rails 44L, 44R. A rear cushion unit (see reference numeral 25 in FIG. 1) is provided between the left and right seat rails 44L and 44R behind the first cross member 55 so that both ends protrude outward from the outer surfaces of the left and right seat rails 44L and 44R. ) Is attached between the rear ends of the left and right seat rails 44L, 44R behind the cross bar 57. Member 56 is passed.

Returning to FIG. 2, the front ends 58 of the sub frames 52L and 52R as components of the seat rails 44L and 44R are first planes 65 and 65 as side walls of the pivot frame 42 (only the reference numeral 65 on the front side of the drawing is shown). Is superimposed. Subframes 52L and 52R are joined to the first plane 65 by spot welding. In the figure, the points indicated by x are spot welding points.
The joining means is not limited to spot welding (resistance welding), and arc welding, gas welding, brazing or the like may be used.

Next, the cross-sectional structure of the front half of the main frame will be described.
As shown in FIG. 4, the main frame 41 is a pressed metal plate and abuts the concave left and right main members 59 </ b> L and 59 </ b> R having an opening portion opened inward in the vehicle width direction from the outside in the vehicle width direction. It is a member having a space portion having a substantially B-shaped cross section. The left and right main members 59L and 59R are respectively formed with left and right convex portions 49L and 49R that bulge outward in the vehicle width direction. By providing the protrusions 49L and 49R on the main frame 41, the rigidity can be increased compared to the case where the protrusions are not provided, so that the occurrence of vibration can be suppressed.

Next, the first cross member passed to the front part of the left and right seat rails will be described.
As shown in FIG. 5, the left seat rail 44L includes a left main member 61L provided on the outer side in the vehicle width direction, a left front submember 62L that abuts against the front portion of the left main member 61L from the inner side in the vehicle width direction, The left rear submember 63L lining the left main member 61L from the inside in the vehicle width direction so as to overlap the rear end portion of the left front submember 62L.

Similarly, the right seat rail 44R includes a right main member 61R provided outward in the vehicle width direction, a right front submember 62R that abuts against the front portion of the right main member 61R from the vehicle width direction inner side, and the right front submember 62R. It consists of a right rear submember 63R that lines the right main member 61R from the inside in the vehicle width direction so as to overlap the rear end portion.
The portions where the left and right front submembers 62L and 62R overlap with the left and right rear submembers 63L and 63R are hereinafter referred to as left and right divided portions 64L and 64R.

A cross member (first cross member 55) is provided between the pair of left and right seat rails 44L and 44R so as to straddle the pair of left and right seat rails 44L and 44R.
The first cross member 55 is provided so as to straddle the left and right divided portions 64L and 64R where the left and right front submembers 62L and 62R and the left and right rear submembers 63L and 63R respectively overlap. The first cross member 55 is a pressed metal plate.

As shown in FIG. 6, the first cross member 55 includes left and right first cross member bent portions 66L and 66R that extend in the vehicle longitudinal direction and are bent upward at left and right end portions 65L and 65R in the vehicle width direction. Yes.
Further, the first cross member 55 is provided with a width direction bent portion 67b extending in the vehicle width direction at the rear end 55b in the vehicle longitudinal direction.

  By providing the first cross member 55 with a width direction bent portion 67b extending in the vehicle width direction, the rigidity of the first cross member 55 can be increased. By increasing the rigidity of the first cross member 55, the rigidity of the entire body frame 11 can be increased.

  Further, since the left and right first cross member bent portions 66L and 66R extending in the longitudinal direction of the vehicle are provided at the left and right end portions 65L and 65R of the cross member, the rigidity of the first cross member 55 can be further increased. .

  In this embodiment, the width direction bent portions are provided at both ends of the front end portion and the rear end portion of the first cross member 55, but may be provided only at the rear end in the vehicle longitudinal direction, or at the front end in the longitudinal direction. It can be provided only in the case.

Next, the structure of the seat rail will be described in more detail.
As shown in FIG. 7, the pair of left and right seat rails 44L and 44R are formed by joining a plurality of press-worked metal plates and having concave portions 71L and 71R each opening inward in the vehicle width direction. The left and right main members 61L and 61R and the left and right submembers 60L and 60R joined so as to cover the left and right open portions 71L and 71R, respectively.

  Since the left and right submembers 60L and 60R are positioned in the left and right divided portions 64L and 64R, the left front submember 62L and the left rear submember 63L, which are components of the left submember 60L, overlap each other, and the configuration of the right submember 60R The right front submember 62R and the right rear submember 63R, which are elements, overlap each other.

  Upper and lower flange portions 72La, 72Ra, 72Lb, 72Rb to which the left and right submembers 60L, 60R are abutted and welded to the upper and lower end portions 61La, 61Ra, 61Lb, 61Rb in the height direction of the left and right main members 61L, 61R, respectively. Each is provided.

As shown in FIG. 8, left and right first cross member bent portions 66L and 66R that extend in the vehicle longitudinal direction and are bent upward are provided on the left and right ends 65L and 65R in the vehicle width direction of the first cross member 55. The left and right first cross member bent portions 66L and 66R are joined to the upper flange portions 72La and 72Ra.
Further, the first cross member 55 is provided with a fuel tank fastening portion 75 to which the rear end of the fuel tank (FIG. 1, reference numeral 16) is fastened, and a bulging portion 76 bulging upward in the fuel tank fastening portion 75 is provided. Is provided.

The operation of the body frame of the motorcycle described above will be described next.
Returning to FIG. 7, a first cross member 55 is provided between the pair of left and right seat rails 44L, 44R so as to straddle the pair of left and right seat rails 44L, 44R.

  Since the left and right cross member bent portions 66L and 66R extending in the vehicle longitudinal direction are provided at the left and right end portions 65L and 65R of the first cross member, the rigidity of the first cross member 55 is increased. In addition, since the left and right cross member bent portions 66L, 66R are bent upward, the first cross member 55 is brought closer to the torsion center point of the seat rails 44L, 44R than the structure bent downward. Can be arranged. As a result, the torsional rigidity of the seat rails 44L and 44R can be increased.

  Further, in the present invention, when the left and right submembers 60L and 60R are welded to the left and right main members 61L and 61R, the left and right cross member bent portions 66L and 66R are simultaneously welded to the left and right main members 61L and 61R. .

  The main member 61L (61R), the sub member 60L (60R), and the cross member 55L (55R) are welded at the same time, so that the sub member 60L (60R) is welded to the main member 61L (61R) and then the cross member bent portion 66L (66R). ), The number of welding processes can be reduced, and the welding time can be reduced.

  Returning to FIG. 6, the first cross member 55 is provided with a fuel tank fastening portion 75 for fastening the rear end of the fuel tank (FIG. 1, reference numeral 16) supported by the vehicle body frame 11, and this fuel tank fastening portion 75. In addition, a bulging portion 76 bulging upward at a substantially central position in the vehicle width direction is provided.

  The first cross member 55 includes a width direction bent portion 67b extending in the vehicle width direction. By providing the width direction bent portion 67b, the rigidity of the first cross member 55 can be further increased. By increasing the rigidity of the first cross member 55, the rigidity of the entire body frame 11 can be increased.

  Referring also to FIG. 8, the first cross member 55 is provided with a fuel tank fastening portion 75 for fastening the rear end of the fuel tank 16 supported by the vehicle body frame 11. A bulging portion 76 that bulges upward at a substantially central position in the width direction is provided.

  By forming the bulging portion 76 on the first cross member 55, the rigidity of the first cross member 55 can be further increased as compared with the case where the bulging portion is not formed. By increasing the rigidity of the first cross member 55, the rigidity of the entire body frame 11 can be increased.

  Further, the left and right submembers 60L and 60R are divided into left and right front submembers 62L and 62R, and left and right rear submembers 63L and 63R positioned on the vehicle rear side of the left and right front submembers 62L and 62R, respectively.

  6 and 7, the first cross member 55 is provided so as to straddle the left and right divided portions 64L and 64R which are the boundary portions between the left and right front submembers 62L and 62R and the left and right rear submembers 63L and 63R. ing. Since the left and right divided portions 64L and 64R can be reinforced by straddling the left and right divided portions 64L and 64R with the first cross member 55, the rigidity of the entire body frame 11 can be increased.

Next, a structure in which the second cross member constituting the cross member is passed to the rear ends of the left and right seat rails 44L and 44R will be described.
As shown in FIG. 9, a cross member (second cross member 56) is provided between the pair of left and right seat rails 44L and 44R so as to straddle the pair of left and right seat rails 44L and 44R. The second cross member 56 is a pressed metal plate.

As shown in FIG. 10, the second cross member 56 is provided with left and right second cross member bent portions 86L and 86R extending in the vehicle longitudinal direction and bent upward at left and right ends 65L and 65R in the vehicle width direction. Yes.
Further, the second cross member 56 includes width direction bent portions 87a and 87b extending in the vehicle width direction at the vehicle longitudinal direction front end 56a and the rear end 56b.

  By providing the second cross member 56 with width direction bent portions 87a and 87b extending in the vehicle width direction, the rigidity of the second cross member 56 can be increased. By increasing the rigidity of the second cross member 56, the rigidity of the vehicle body frame 11 can be increased.

Further, since the left and right cross member bent portions 66L and 66R extending in the longitudinal direction of the vehicle are provided at the left and right end portions 85L and 85R of the second cross member, the rigidity of the second cross member 56 can be further increased. .
In the present embodiment, the width direction bent portion is provided at the front end and the rear end in the vehicle longitudinal direction of the second cross member 56, but may be provided at either the front end or the rear end in the longitudinal direction.

  As shown in FIG. 11, the pair of left and right seat rails 44L and 44R are formed by joining two pressed metal plates, and left and right main members 61L and 61R positioned outward in the vehicle width direction. The left and right main members 61L and 61R are respectively composed of left and right submembers 60L and 60R which are abutted and joined from the inside in the vehicle width direction.

The operation of the second cross member will be described below.
Since the left and right cross member bent portions 86L and 86R extending in the vehicle longitudinal direction are provided at the left and right end portions 85L and 85R of the second cross member, the rigidity of the second cross member 56 is increased.

  In addition, since the left and right cross member bent portions 86L and 86R are bent upward, the second cross member 56 is brought closer to the torsion center point of the seat rails 44L and 44R than the structure bent downward. Can be arranged. As a result, the torsional rigidity of the seat rails 44L and 44R can be increased.

  Returning to FIG. 10, the second cross member 56 includes width-direction bent portions 87a and 87b extending in the vehicle width direction. By providing the width direction bent portions 87a and 87b, the rigidity of the second cross member 56 can be further increased. By increasing the rigidity of the second cross member 56, the rigidity of the vehicle body frame 11 can be increased.

  In FIG. 11, when the left and right submembers 60L and 60R are welded to the left and right main members 61L and 61R, the left and right cross member bent portions 86L and 86R are simultaneously welded to the left and right main members 61L and 61R. did.

  The main member 61L (61R), the sub member 60L (60R), and the second cross member 56L (56R) are welded at the same time, so that the sub member 60L (60R) is welded to the main member 61L (61R) and then the cross member bent portion 86L. Compared to the case of welding (86R), the number of welding processes can be reduced, and the welding time can be reduced.

Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a saddle-ride type tricycle and can be applied to a general saddle-ride type vehicle.
In the first aspect, the left and right cross member bent portions and the upper flange portion may be welded separately after the sub-members are welded to the left and right main members, respectively.

According to the second aspect of the present invention, it is possible to omit the widthwise bent portion provided at the front end or the rear end of the cross member in the vehicle longitudinal direction and extending in the vehicle width direction.
According to the third aspect of the present invention, it is possible to omit the bulging portion that bulges up substantially at the center of the cross member in the vehicle width direction.

  The present invention is suitable for motorcycles.

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame of motorcycle, 12 ... Head pipe, 16 ... Fuel tank, 22 ... Seat, 44L, 44R ... Seat rail, 55 ... Cross member (first cross member), 56 ... Cross member ( Second cross member), 60L, 60R ... left and right submembers, 61L, 61R ... left and right main members, 61La, 61Ra ... upper end in the height direction of the main member, 61Lb, 61Rb ... lower end in the height direction of the main member 62L, 62R ... left and right front submembers, 63L, 63R ... left and right rear submembers, 64L, 64R ... divided portions, 66L, 66R ... left and right first cross member bent portions, 67a, 67b ... width-direction bent portions, 71L, 71R ... Open portion, 72La, 72Ra ... Upper flange portion, 72Lb, 72Rb ... Lower flange portion, 75 ... Fuel tab Click fastening portion, 76 ... swelling portion, 86L, 86R ... second cross member bent portions of the left and right, 87a, 87b ... widthwise bent portion.

Claims (4)

A head pipe (12), a main frame (41) extending from the head pipe (12) to the rear of the vehicle and then downward, and a pair of left and right seat rails extending from the main frame (41) to the rear of the vehicle and supporting the seat (44L, 44R), in a vehicle body frame of a motorcycle,
The pair of left and right seat rails (44L, 44R) are pressed metal plates, and left and right main members (61L, 61R) having open portions (71L, 71R) that open inward in the vehicle width direction. And left and right sub-members (60L, 60R) joined so as to cover the left and right open portions (71L, 71R),
Upper flange portions (72La, 72Ra) on which the left and right submembers (60L, 60R) are abutted and welded to the upper end portions in the height direction of the left and right main members (61L, 61R), respectively,
Cross members (55, 56) are provided between the pair of left and right seat rails (44L, 44R) so as to straddle between the pair of left and right seat rails (44L, 44R),
The cross members (55, 56) are pressed metal plates, and left and right cross member bent portions extending in the vehicle longitudinal direction and bent upward at left and right ends in the vehicle width direction of the cross member (55). (66L, 66R, 86L, 86R)
These left and right cross member bent portions (66L, 66R, 86L, 86R) are joined to the upper flange portion (72La, 72Ra) ,
The left and right submembers (60L, 60R) are the left and right front submembers (62L, 62R) and the left and right rear submembers (63L, 63R) located on the vehicle rear side of the left and right front submembers (62L, 62R). And is divided into
The cross member (55) is provided so as to straddle the divided portions (64L, 64R) of the left and right front submembers (62L, 62R) and the left and right rear submembers (63L, 63R). Motorcycle body frame.    The left and right cross member bent portions (66L, 66R, 86L, 86R) and the upper flange portions (72La, 72Ra) are connected to the left and right main members (61L, 61R) and the left and right submembers (60L, 60R). 2. The body frame of the motorcycle according to claim 1, wherein each of the two is welded by spot welding at the same time.    The cross member (55, 56) includes a width direction bent portion (67b, 87a, 87b) extending in the vehicle width direction at least one of the front end and the rear end in the vehicle longitudinal direction. The body frame of the motorcycle according to claim 1 or 2. The cross member (55, 56) is provided with a fuel tank fastening part (75) for fastening a rear end of the fuel tank (16) supported by the vehicle body frame (11),
The fuel tank fastening part (75) is provided with a bulging part (76) that bulges upward at a substantially central position in the vehicle width direction. Motorcycle motorcycle body frame .

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