WO2019017477A1

WO2019017477A1 - Vehicle body frame structure

Info

Publication number: WO2019017477A1
Application number: PCT/JP2018/027294
Authority: WO
Inventors: 貴正井口
Original assignee: 本田技研工業株式会社
Priority date: 2017-07-20
Filing date: 2018-07-20
Publication date: 2019-01-24
Also published as: BR112020000861B1; JPWO2019017477A1; CN110914141A; JP6783939B2; CN110914141B; BR112020000861A2; PH12020500061A1

Abstract

This vehicle body frame structure is provided with: a head pipe (21); a main frame (22) which extends to the rear of the head pipe (21); a plurality of seat rails (30) which extend to the rear of the main frame (22); and a plurality of cross members (31, 32) which connect the plurality of seat rails (30). The plurality of cross members (31, 32) are separated by a region (R1) where there are no joints with the seat rails (30), and are integrated with each other by connecting parts (40) disposed in said region (R1) where there are no joints.

Description

Body frame structure

The present invention relates to a vehicle body frame structure.
Priority is claimed on Japanese Patent Application No. 201-141153, filed July 20, 2017, the content of which is incorporated herein by reference.

Conventionally, there is a body frame structure of a saddle-ride type vehicle provided with a plurality of cross members between seat rails (for example, see Patent Document 1).

Japanese Patent Application Laid-Open No. 10-86872

By the way, in the said vehicle body frame structure, since the some cross member is provided, the increase in a number of parts is mentioned as a subject. In addition, an increase in the number of assembling steps due to the positioning of the individual cross members is also an issue.

Therefore, an object of the present invention is to suppress an increase in the number of parts and the number of assembling steps in a vehicle body frame structure including a plurality of cross members between seat rails.

In order to solve the above-mentioned subject, the mode of the present invention has the following composition.
(1) A vehicle body frame structure according to an aspect of the present invention includes a head pipe, a main frame extending rearward of the head pipe, a plurality of seat rails extending rearward of the main frame, and the plurality of seat rails And a plurality of cross members connected to each other, wherein the plurality of cross members are separated from each other through a non-joining area with respect to the seat rail and integrated with each other through a coupling portion disposed in the non-joining area There is.

(2) In the vehicle body frame structure described in the above (1), the connecting portion has a plurality of connecting pieces along the plurality of seat rails and an opening formed between the plurality of connecting pieces. You may

(3) In the vehicle body frame structure described in the above (1) or (2), the plurality of cross members may be respectively disposed between the front end portions of the plurality of seat rails and between the front and rear middle portions.

(4) In the vehicle body frame structure according to any one of (1) to (3), the cross member provided between the front end portions of the plurality of seat rails may be a stay portion joined to the main frame May be included.

(5) In the vehicle body frame structure according to any one of (1) to (4), the cross member provided between the front and rear middle portions of the plurality of seat rails is a tank support portion for supporting a fuel tank May be included.

According to the vehicle body frame structure described in the above (1) of the present invention, since the plurality of cross members separated from each other are integrated through the connecting portion, the number of parts and the number of assembling steps can be reduced. Further, the plurality of cross members and the connecting portion can be integrally formed as an integral member, and the accuracy of the relative position between the plurality of cross members can be enhanced.

According to the vehicle body frame structure described in the above (2) of the present invention, weight reduction can be achieved when the plurality of cross members and the connecting portion are integrated into one member, and the seat rail can be reinforced by the connecting piece. .

According to the vehicle body frame structure described in (3) of the present invention, the front end portions of the plurality of seat rails connected to the main frame are solidified with the cross member, and the front and rear intermediate portions susceptible to bending stress in the seat rails are crossed It can be reinforced by members.

According to the vehicle body frame structure described in the above (4) of the present invention, it is possible to enhance the bonding strength between the front end portion of the seat rail and the main frame. Further, the seat rail and the main frame can be easily positioned by the stay portion.

According to the vehicle body frame structure described in the above (5) of the present invention, the functionality can be improved by providing the tank support portion for the fuel tank in the front and rear middle portion of the seat rail.

1 is a left side view of a motorcycle according to an embodiment of the present invention. FIG. 6 is a left side view of a vehicle body frame of the motorcycle. It is a top view of the above-mentioned body frame. It is a left side view showing an important section of a seat rail of the above-mentioned body frame. FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 4; It is a perspective view including a partial cross section of the above-mentioned seat rail. It is a top view around the above-mentioned seat rail. FIG. 7 is a left side view of the vicinity of a connection between a main frame and a pivot frame of the vehicle body frame. It is IX-IX sectional drawing of FIG. It is the perspective view which looked at the said connection part periphery from the front side. It is the perspective view which looked at the said connection part periphery from the rear side. It is a top view around the cross member of the above-mentioned seat rail. It is a perspective view of the above-mentioned cross member circumference.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, directions such as front, rear, left, and right are the same as the directions in the vehicle described below unless otherwise specified. Further, an arrow FR indicating the front of the vehicle, an arrow LH indicating the left of the vehicle, an arrow UP indicating the upper side of the vehicle, and a line CL indicating the left-right center of the vehicle are shown at appropriate positions in the drawings used for the following description.

As shown in FIG. 1, the present embodiment is applied to a motorcycle 1 which is a saddle-ride type vehicle. The front wheels 2 of the motorcycle 1 are supported by lower end portions of the left and right front forks 3. The upper portions of the left and right front forks 3 are supported by the head pipe 21 at the front end of the vehicle body frame 20 via the steering stem 4. A steering bar handle 6 is attached to the top of the steering stem 4.

The rear wheel 7 of the motorcycle 1 is supported by the rear end of the swing arm 8. The front end portion of the swing arm 8 is supported by a pivot pipe 25 at the front and rear middle portion of the vehicle body frame 20. The “middle” used in the present embodiment includes not only the center between the ends of the target but also the inner range between the ends of the target.
The rear wheel 7 is connected to an engine 10 which is a prime mover of the motorcycle 1 via, for example, a chain type transmission mechanism 7a disposed on the left rear side of the vehicle body. Lower ends of a pair of left and right rear cushions 9 are connected to rear portions of left and right arms of the swing arm 8.

The engine 10 is mounted on a vehicle body frame 20. The engine 10 has a cylinder 12 raised above the front of the crankcase 11.
An intake passage 13 is connected to the rear of the cylinder 12. An exhaust pipe 14 is connected to the front of the cylinder 12. The exhaust pipe 14 extends rearward from the front to the rear of the engine 10 and is connected, for example, to an exhaust muffler (not shown) disposed on the right side of the rear of the vehicle body.

Above the engine 10, a fuel tank 15 for storing fuel of the engine 10 is disposed. A seat 16 on which a driver and a rear passenger sit is disposed behind the fuel tank 15. A pair of left and right main steps 17 on which the driver's foot is placed and a pair of left and right pillion steps 18 on which the rear passenger carries a foot are respectively disposed on both sides of the lower portion of the vehicle body.

Referring to FIGS. 2 and 3, the vehicle body frame 20 is configured by integrally joining a plurality of types of steel materials by welding or the like.
The vehicle body frame 20 is joined to the head pipe 21, a single main frame 22 extending rearward and downward along the vehicle left and right center to the rear of the head pipe 21, and the rear lower end 48 of the main frame 22 and extends vertically. And a pivot frame 23.

The main frame 22 extends rearward from the head pipe 21 in a side view so as to narrow the vertical width toward the rear side. The main frame 22 has a front half slightly expanded to the left and right in a plan view, and then extends rearward with a substantially uniform width. The main frame 22 is generally curved rearward and downward in a side view. The front portion of the main frame 22 is curved relatively gently, while the rear portion of the main frame 22 is curved with an increased curvature. The rear portion of the main frame 22 may be referred to as a curved portion 22w.

The pivot frame 23 is provided continuously below the rear lower end 48 of the main frame 22. The upper end portion 49 of the pivot frame 23 constitutes a connection portion 47 together with the rear lower end portion 48 of the main frame 22. A rear hanger bracket 24 for supporting the rear of the crankcase 11 of the engine 10 is fixed to the front lower portion of the pivot frame 23. A pivot pipe 25 for supporting the front end of the swing arm 8 is fixed to the upper and lower intermediate portions of the pivot frame 23. The pivot pipe 25 projects left and right side portions to the left and right outer sides of the pivot frame 23. The front lower end portions of the pair of left and right support pipes 26 are joined to the outer peripheral surface of the left and right side portions of the pivot pipe 25.

The vehicle body frame 20 includes a single down frame 27 extending rearward and downward along the center of the vehicle body from the lower part of the head pipe 21 to the rear. The down frame 27 has a steeper inclination than the main frame 22 in a side view and extends rearward and downward. At the lower end portion of the down frame 27, a front hanger bracket 28 for supporting the front portion of the crankcase 11 of the engine 10 is integrally formed. The upper portion of the down frame 27 is formed to extend in the front and rear width toward the upper side in a side view. An upper portion of the down frame 27 constitutes a gusset portion 27 g integrally joined to the lower front side of the main frame 22. The front edge of the down frame 27 is formed in a straight line in a side view, while the rear edge of the down frame 27 is formed in a curved shape that is convex forward in a side view.

The vehicle body frame 20 has a front end portion joined to the rear portion of the main frame 22, a pair of left and right seat rails 30 extending substantially horizontally from the front end portion, and a front end portion joined to the pivot pipe 25 And a pair of left and right support pipes 26 extending upward and rearward and upward and backward. The left and right support pipes 26 support the front and rear intermediate portions of the left and right seat rails 30 from below. The left and right seat rails 30 extend to the rear end of the vehicle body frame 20. Rear end portions of the left and right seat rails 30 are connected to each other via a rear cross member 34. Front end portions of the left and right seat rails 30 are connected to each other via a first front cross member (cross member) 31. Front and rear intermediate portions of the left and right seat rails 30 are connected to each other via a second front cross member (cross member) 32. The front and rear intermediate portions of the left and right seat rails 30 are further connected to each other via a cross pipe 33 at the rear of the second front cross member 32.

Referring also to FIG. 1, the vehicle body frame 20 has a so-called diamond frame structure that utilizes the engine 10 as a part of the frame structure. The engine 10 is mounted on the vehicle body frame 20 so as to be surrounded by the main frame 22, the down frame 27 and the pivot frame 23 in a side view. The front of the crankcase 11 of the engine 10 is supported by the front hanger bracket 28, and the rear of the crankcase 11 is supported by the rear hanger bracket 24. The down frame 27 and the pivot frame 23 are connected to each other via the crankcase 11 of the engine 10.

The lower portion of the fuel tank 15 is formed in a bowl shape straddling the main frame 22 in the left and right direction. The rear of the fuel tank 15 extends rearward so as to overlap the front of the left and right seat rails 30 in the front-rear direction. At a rear end portion of the fuel tank 15, a rear mounting portion 15a rubber-mounted to the second front cross member 32 is provided. On the left and right inner side surfaces of the lower portion of the wedge shape in the fuel tank 15, a pair of U-shaped receiving members 15b which are opened forward in a side view are provided in a left-right pair. The left and right receiving members 15 b are engaged from behind with cylindrical mount rubbers (not shown) held on the left and right outer side surfaces of the main frame 22, and the front portion of the fuel tank 15 is rubber mounted on the vehicle body frame 20.

The main frame 22, the pivot frame 23, the down frame 27, and the left and right seat rails 30 are each formed of a combination of press frame bodies formed by pressing a steel plate.

As shown in FIGS. 8 and 9, the main frame 22 is configured by integrally joining a pair of left and right main press frame bodies 42L and 42R. The left and right main press frame bodies 42L and 42R are steel plate press-formed parts that are integral with each other. Each of left and right main press frame bodies (first press frame bodies) 42L and 42R extends inward in the vehicle width direction from the upper edge of the outer side wall portion 42a facing the outer side in the vehicle width direction (lateral side outer side) and the outer side wall portion 42a. Upper wall portion 42b which stands up, upper joint flange 42d which stands up from the tip edge of upper wall portion 42b, lower wall portion 42c which stands up inward in the vehicle width direction from the lower edge of outer wall portion 42a, lower wall portion The lower joint flange 42e which stands up downward from the front end edge of 42c is integrally provided.

The left and right main press frame bodies 42L, 42R contact the upper and lower joining

flanges

42d, 42e with each other in the vehicle width direction. The upper and lower joining

flanges

42d and 42e are integrally joined by a plurality of spot welded parts (joining parts) sp arranged in the flange length direction (front and rear direction, length direction of the main frame 22) orthogonal to the flange erecting direction (vertical direction). It is done.

Thereby, an integral main frame 22 having a rectangular closed cross-sectional structure (first closed cross-sectional structure) 22cs by the left and right outer side walls 22a and the upper and

lower walls

22b and 22c is configured. Hereinafter, portions of the left and right main press frame bodies 42L and 42R excluding the upper and lower joining

flanges

42d and 42e are referred to as a bulging portion (first bulging portion) 42bs forming the closed cross-sectional structure 22cs of the main frame 22. is there.

Referring to FIGS. 8 and 9, the pivot frame 23 is configured by integrally joining a pair of left and right pivot

press frame bodies

43L and 43R. The left and right pivot press frame bodies (second press frame bodies) 43L and 43R are steel plate press-formed parts that are integral with each other. Each of the left and right pivot

press frame bodies

43L and 43R includes an outer side wall 43a facing outward in the vehicle width direction, a front wall 43b rising inward in the vehicle width direction from a front edge of the outer side wall 43a, and an outer side wall 43a. And a rear wall portion 43c which is erected inward in the vehicle width direction from the rear edge.

The front end of the front wall 43b in one of the left and right pivot

press frame bodies

43L and 43R (for example, the left pivot press frame body 43L) is the front in the other (for example, the right pivot press frame body 43R) of the left and right pivot

press frame bodies

43L and 43R. It is displaced in a step-like manner forward by the thickness of the end of the wall 43b. As a result, the tip end of the front wall 43b at the other of the left and right pivot

press frame bodies

43L and 43R enters the inside of the cross section at one of the left and right pivot

press frame bodies

43L and 43R. The front end portions of the front wall portions 43b of the left and right pivot

press frame bodies

43L and 43R overlap with each other in the thickness direction, and the front end portions are integrally joined by, for example, arc welding or the like. The symbol bd in the figure indicates a weld bead.

Similarly, the tip of the rear wall 43c of one of the left and right pivot

press frame bodies

43L and 43R (for example, the left pivot press frame body 43L) is the other of the left and right pivot

press frame bodies

43L and 43R (for example, the right pivot press frame body 43R). Is displaced in a step-like manner rearward by an amount corresponding to the thickness of the tip of the rear wall 43c. As a result, the end of the rear wall 43c at the other of the left and right pivot

press frame bodies

43L and 43R. The front end portions of the rear wall portions 43c of the left and right pivot

press frame bodies

43L and 43R overlap each other in the thickness direction, and these front end portions are integrally joined by, for example, arc welding or the like.

Thus, an integral pivot frame 23 having a rectangular closed cross-sectional structure (second closed cross-sectional structure) 23cs formed by the left and right outer wall portions 23a and the front and

rear wall portions

23b and 23c is configured. Hereinafter, the portion of the left and right pivot

press frame bodies

43L and 43R that forms the closed cross-sectional structure 23cs of the pivot frame 23 may be referred to as a bulging portion (second bulging portion) 43bs. A reinforcing member 49g is fixed in the closed cross-sectional structure 23cs of the pivot frame 23.

Referring to FIG. 2, the down frame 27 is configured by integrally joining a pair of left and right down press frame bodies. The left and right down press frame bodies are respectively integral steel plate press molded parts. At the front edge of the down frame 27, the left and right down press frame bodies are joined together in the same manner as the left and right pivot

press frame bodies

43L and 43R. At the rear edge of the down frame 27, the left and right down press frame bodies are joined together in the same manner as the left and right main press frame bodies 42L and 42R. In the figure, reference numeral 27 h denotes a rear joint flange of the down frame 27.

4 to 7, each of left and right seat rails 30 integrally joins outer seat press frame body 45O located on the outer side in the vehicle width direction and inner seat press frame body 45I located on the inner side in the vehicle width direction. Is configured. The inner and outer sheet press frame bodies (press frame bodies) 45I and 45O are steel plate press-formed parts that are integral with each other. Each of the inner and outer seat press frame bodies 45I and 45O includes an outer side wall 45a facing outward in the vehicle width direction, an upper wall 45b rising inward in the vehicle width direction from an upper edge of the outer side wall 45a, and an upper wall 45b. An upper joint flange 45d standing upward from the leading edge, a lower wall 45c standing inward in the vehicle width direction from the lower edge of the outer wall 45a, and a lower joint flange standing downward from the leading edge of the lower wall 45c And the joint flange 45e.

The inner and outer seat press frame bodies 45I and 45O contact the upper and lower joining

flanges

45d and 45e with each other in the vehicle width direction. The upper and lower

joint flanges

45d and 45e are integrally formed by a plurality of spot welded portions (joint portions) sp lined up in a flange length direction (front and rear direction, which is also the length direction of the seat rail 30) orthogonal to the flange rising direction (vertical direction). Bonded to.

As a result, an integral seat rail 30 having a rectangular closed cross-sectional structure 30cs of the left and right outer side walls 30a and the upper and

lower walls

30b and 30c is formed. Hereinafter, a portion of the inner and outer sheet press frame bodies 45I and 45O excluding the upper and lower joining

flanges

45d and 45e may be referred to as a bulging shape portion 45bs forming the closed cross-sectional structure 30cs of the seat rail 30.

The left and right support pipes 26 are integrally formed of round steel pipes, respectively. Rear upper end portions of the left and right support pipes 26 are connected to front and rear middle portions of the left and right seat rails 30, respectively.

The seat rail 30 forms a downward projecting portion 35 having a triangular shape which is downwardly convex in a side view at a front and rear intermediate portion connecting the support pipe 26. The rear upper end of the support pipe 26 is inserted into the front slope 35a of the lower projection 35 from the front lower side. The lower projecting portion 35 is formed with a cylindrical insertion portion 35c extending along the rear inclined portion 35b. For example, an oblong weld hole 35d is formed on the side wall of the insertion portion 35c. For example, arc welding is performed along the inner peripheral edge of the welding hole 35d, and the insertion portion 35c and the support pipe 26 are joined. The rear inclined portion 35b of the lower protruding portion 35 is substantially parallel to the inclination of the support pipe 26 in a side view and substantially parallel to the upward inclination of the rear portion of the seat rail 30.

The seat rail 30 has a front and rear intermediate portion forming the lower projecting portion 35 connected to the front half portion 36 linearly extending in the front and rear direction in a side view via the curved portion 37. The lower joining flange 45e is between the first straight portion 45e1 along the front half 36 of the seat rail 30, the second straight portion 45e2 along the front inclined portion 35a of the lower protruding portion 35, and both straight portions 45e1 and 45e2. And a curved portion 45e3 having a circular arc shape in a side view. The curved portion 45 e 3 is included in the curved portion 37 of the seat rail 30.

At the central portion of the curved portion 45e3 of the lower joint flange 45e in the flange length direction, a widened portion 45e4 is formed in which the flange rising height is increased with respect to the portion excluding the curved portion 45e3. The widening portion 45 e 4 has, for example, two spot welded portions sp aligned in the flange length direction. These spot welds sp are separated from the flange proximal end of the lower joining flange 45 e as compared to the spot welds sp of both straight portions 45

e

1 and 45 e 2 excluding the curved portion 45 e 3.

A panel bending portion 45e5 between the lower joint flange 45e and the lower wall portion 45c in the inner and outer sheet press frame bodies 45I and 45O is formed at the flange base end of the lower joint flange 45e. The panel bending portion 45e5 is formed along the flange length direction (the length direction of the seat rail 30). The front end edge of the lower joint flange 45e is formed along the flange length direction, but the front end edge of the wide portion 45e4 is formed so as to project more trapezoidally than the front end edges of both linear portions 45e1 and 45e2. It is done.

When a seating load is applied to the rear portion of the seat rail 30 or an upward load for supporting the rear of the vehicle body, stress tends to be concentrated on the curved portion 37 where the cross section of the seat rail 30 changes significantly. In particular, distortion is likely to occur in various panel bending portions 45 e 5 in the bending portion 37. Therefore, particularly in the central portion of the curved portion 37 (the central portion of the curved portion 45e3 of the lower bonding flange 45e), the spot welded portion sp is set apart from the panel bent portion 45e5, thereby affecting the distortion of the panel bent portion 45e5. The load on the spot welds sp due to

Referring to FIG. 7, the seat rail 30 has a frame widening portion 38 at the same position as the curved portion 37 in the front-rear direction, in which the width in the vehicle width direction is increased with respect to the frame general portion excluding the curved portion 37 ing. The rigidity of the curved portion 37 is enhanced by the frame widening portion 38, and the distortion thereof is suppressed. The seat rail 30 also has a frame bending portion 39 bent in the vehicle width direction in plan view at the same position as the bending portion 37 in the front-rear direction. At the front-rear intermediate position where the curved portion 37 in the vertical direction and the frame bending portion 39 in the vehicle width direction exist, enhancing the frame rigidity by the frame widening portion 38 has a high effect of suppressing distortion.

The downward protruding portion 35 of the seat rail 30 is a narrow width portion (cross-sectional reduction portion) in which both side portions in the vehicle width direction of the seat rail 30 are displaced to the inside of the frame in the upper front region of the insertion portion 35c for the support pipe 26 ) 35e is formed. The narrowing portion 35 e reduces the cross-sectional shape by reducing the frame width of the seat rail 30 in the upper front region of the insertion portion 35 c. This narrowing portion 35 e relieves stress concentration on the curved portion 37 at the time of load input to the seat rail 30. That is, at the time of load input to the seat rail 30, stress and deformation are dispersed in the narrow portion 35e together with the curved portion 37, and the load on the spot welded portion sp of the curved portion 37 is suppressed.

The correspondence to separate the spot welded part sp from the panel bending part 45e5 and the correspondence to provide the narrow part 35e adjacent to the curved part 37 are not limited to the application to the concave curved part 37, but applied to the convex curved part You may Furthermore, the present invention is not limited to the application to the curved portion 37 of the seat rail 30, but may be applied to the curved portion 22w of the main frame 22.

As described above, the vehicle body frame structure in the present embodiment includes the head pipe 21, the main frame 22 extending to the rear of the head pipe 21, and the seat rail 30 extending to the rear of the main frame 22. At least one of the main frame 22 and the seat rail 30 (for example, the seat rail 30) has a curved portion 37 which is curved when viewed from the first direction (vehicle width direction), and a plurality of press frame bodies 45I, 45O It is formed of a combination of The plurality of press frame bodies 45I and 45O have bulging portions 45bs which form a closed cross-sectional structure 30cs when they are combined with each other. A joint (spot welded part sp) for joining the plurality of press frame bodies 45I and 45O is provided on a joint flange 45e extending from the bulging shape part 45bs of the press frame bodies 45I and 45O to be joined. The distance from the panel bending portion 45e5 for raising the bulging shape portion 45bs at the base end of the joint flange 45e to the joint portion (spot welded portion sp) is the distance from the frame general portion excluding the curved portion 37 The curved portion 37 is long.

According to this configuration, in the seat rail 30 having the curved portion 37 that curves when viewed from the first direction, when a load is applied to the seat rail 30, stress tends to be concentrated on the curved portion 37. In particular, the panel bending portion 45 e 5 in the bending portion 37 is easily deformed. Therefore, the joint on the curved part 37 of the seat rail 30 is separated from the panel bending part 45e5, and the distance from the panel bending part 45e5 to the jointing part is increased, thereby affecting the joint on the deformation of the panel bending part 45e5. It can be suppressed.

In the vehicle body frame structure, the curved portion 37 has a thickness greater than that of the frame general portion in a second direction (front-rear direction) intersecting the first direction.
According to this configuration, the rigidity of the bending portion 37 can be increased to suppress deformation.

Further, in the vehicle body frame structure, the bending portion 37 is bent as viewed from a third direction (vertical direction) intersecting the first direction and the second direction.
According to this configuration, the rigidity is further required for the bent portion of the frame, so the effect of increasing the thickness of the curved portion 37 is enhanced.

In the vehicle body frame structure, at least one of the main frame 22 and the seat rail 30 has the curved portion 37 and has a narrow portion 35e around the curved portion 37 for reducing the cross-sectional shape of the frame. ing.
According to this configuration, the stress is dispersed when the load is input to the frame by the narrow width portion 35 e provided around the curved portion 37, and the narrow width portion 35 e is favorably deformed together with the curved portion 37. The load on the joints of the

As shown in FIG. 8 to FIG. 11, the rear lower end portion 48 of the main frame 22 and the upper end portion 49 of the pivot frame 23 constitute a connecting portion 47 that integrally connects the main frame 22 and the pivot frame 23 to each other. . The connecting portion 47 is provided outside the left and right

outer side walls

48a and 48c of the rear lower end 48 of the main frame 22 in the cross-sectional rectangular shape, and the left and right

outer side walls

49a and 49a in the upper end 49 of the pivot frame 23 in the rectangular shape. The rear wall 49c is overlapped and joined. Further, the connection portion 47 overlaps and welds the front wall portion 49 b of the upper end portion 49 of the pivot frame 23 on the inside of the front wall portion 48 b of the rear lower end portion 48 of the main frame 22. The main frame 22 and the pivot frame 23 are integrally joined by, for example, arc welding.

For example, an oval welding hole (opening) 49 d is formed in the left and right outer side walls 49 a of the upper end 49 of the pivot frame 23. For example, arc welding is applied along the inner peripheral edge of the welding hole 49d, and left and right outer side walls 49a of the upper end 49 of the pivot frame 23 and left and right outer side walls 48a of the rear lower end 48 of the main frame 22 overlapping the inner side. And are joined.

At the left and right front corners of the upper end portion 49 of the pivot frame 23, notches 49e for separating the left and right outer side wall portions 49a and the front wall portion 49b are provided. The front wall 49b is inserted into the main frame 22 independently of the left and right outer walls 49a by the left and right notches 49e.

For example, in the front wall portion 48b of the rear lower end portion 48 of the main frame 22, an oval-shaped welding hole (opening) 48d is formed in a left-right pair. For example, arc welding is performed along the inner peripheral edge of the left and right welding holes 48d, and the front wall 48b of the rear lower end 48 of the main frame 22 and the front wall 49b of the upper end 49 of the pivot frame 23 overlapping the inside Are joined to each press frame body.

On the base end side of the lower joint flange 42e of the rear lower end portion 48 of the main frame 22, a bulged portion 48e for avoiding the weld bead bd on the front side of the upper end portion 49 of the pivot frame 23 is formed. The lower joint flange 42e which is at the same height as the bulging portion 48e is formed with a widening portion 48f for increasing the flange height. It is easy to provide the spot weld sp by avoiding the bulging portion e by the wide portion f.

The rear portion of the upper end portion 49 of the pivot frame 23 is cut away so that the upper end height is lower than the front wall portion 49 b and the left and right outer wall portions 49 a. The rear wall 49c of the upper end 49 of the pivot frame 23 overlaps the rear wall 48c of the rear lower end 48 of the main frame 22 from behind with a small wrap amount compared to the front wall 49b and the left and right outer walls 49a. . In this state, the rear wall 49c of the upper end 49 of the pivot frame 23 and the rear wall 48c of the rear lower end 48 of the main frame 22 are joined by, for example, arc welding. The rear wall 49 c of the upper end 49 of the pivot frame 23 is formed with a notch 49 f that avoids the upper joint flange 42 d of the main frame 22.

The left and right outer side walls 49a and the rear wall 49c of the upper end 49 of the pivot frame 23 are overlapped and joined to the outer sides of the left and right outer side walls 48a and the rear wall 48c of the rear lower end 48 of the main frame 22, The configuration is not limited to the configuration in which the front wall 49b of the upper end 49 of the upper end 49 overlaps and is joined to the inside of the front wall 48b of the rear lower end 48 of the main frame 22. For example, the wall portions overlapping each other may be replaced by the main frame 22 and the pivot frame 23, the inside and outside of the overlapping wall portions may be reversed, or the wall portions may be overlapped in a pattern different from the above.

In the configuration in which one of the main frame 22 and the pivot frame 23 is entirely inserted into the other cross section, it is difficult to absorb an assembly error due to component variation or the like. That is, in the configuration in which the main frame 22 and the pivot frame 23 are so-called inlay fitting, a gap or interference may occur between the two.

In the present embodiment, the left and right outer side walls 49a and the front wall 49b of the upper end 49 of the pivot frame 23 are independently made independent and the upper end is a cantilevered piece with a free end. It becomes easy to absorb. The left and right outer side walls 49a and the front wall 49b of the upper end 49 of the pivot frame 23 are set to overlap by pressing the left and right outer side walls 49a and the front wall 48b of the rear lower end 48 of the main frame 22. It becomes possible to suppress the clearance gap mutually and to join.

As described above, the vehicle body frame structure in the present embodiment includes the head pipe 21, the main frame 22 extending to the rear of the head pipe 21, and the pivot frame 23 extending to the lower side of the main frame 22. Between the main frame 22 and the pivot frame 23, there is provided a connecting portion 47 for connecting the main frame 22 and the pivot frame 23 to each other. The connecting portion 47 abuts and joins a part of one of the main frame 22 and the pivot frame 23 from the outside of the other closed sectional structure 22cs, 23cs of the main frame 22 and the pivot frame 23, and The remaining part of one of the frame 22 and the pivot frame 23 is abutted and joined from the inside of the other closed cross-sectional structure 22cs, 23cs of the main frame 22 and the pivot frame 23.

According to this configuration, when one of the main frame 22 and the pivot frame 23 is inserted into the other closed cross-sectional structure 22cs, 23cs in a so-called plug-in engagement, rattling or interference occurs in the connection portion 47 due to an assembly error. , Frame connection becomes difficult. Therefore, a part of one frame is abutted and joined from the outside of the other frame, and the remaining part of one frame is abutted and joined from the inside of the other frame to absorb assembly errors. The frame connection can be made easily and reliably.

Further, in the vehicle body frame structure, the connecting portion 47 forms an opening (

welding holes

48d, 49d) where the inner peripheral edge becomes a joining portion in at least one of the main frame 22 and the pivot frame 23.
According to this configuration, the bonding strength can be improved by increasing the length of the bonding portion.

In the vehicle body frame structure, the main frame 22 is formed of a combination of a plurality of press frame bodies 42L and 42R. The plurality of press frame bodies 42L, 42R have bulging portions 42bs that form a closed cross-sectional structure 22cs when they are combined with each other. Joints (spot welded parts sp) for joining the plurality of press frame bodies 42L and 42R together are

joint flanges

42d and 42e bent and extended from the bulging shape part 42bs of the press frame bodies 42L and 42R to be joined. It is provided.
According to this configuration, the plurality of press frame bodies 42L and 42R that form the main frame 22 are joined by the joining

flanges

42d and 42e that are bent and extended from the bulging shape portion 42bs, so that the plurality of press frame bodies It is possible to suppress the distortion of the closed cross-sectional structure 22cs due to the connection between the 42L and 42R.

Further, in the vehicle body frame structure, the pivot frame 23 is formed of a combination of a plurality of

press frame bodies

43L and 43R. The plurality of

press frame bodies

43L, 43R have bulging portions 43bs that form a closed cross-sectional structure 23cs when they are combined with each other. The joint portion (spot welded portion sp) for joining the plurality of

press frame bodies

43L and 43R together is formed on the inside of one of the bulged portions 43bs of the

press frame bodies

43L and 43R to be joined. Are provided at the overlapping portions.
According to this configuration, when the

press frame bodies

43L and 43R forming the main frame 22 are joined at the overlapping portion of the bulging shape portions 43bs, a joint flange extending from the bulging shape portion 43bs is provided. In contrast, the space for arranging the engine 10 and the electrical components around the pivot frame 23 can be easily secured.

Further, in the vehicle body frame structure, the connecting portion 47 contacts a part of the pivot frame 23 from the outside in the vehicle width direction of the closed cross-sectional structure 22cs of the main frame 22 and joins the same. The remaining portions of the main frame 22 are brought into contact from the inside of the closed cross-sectional structure 22cs of the main frame 22 in the longitudinal direction of the vehicle.
According to this configuration, even in the configuration in which the joining flanges stand upright on the front and back of the main frame 22, the pivot frame 23 and the main frame 22 can be connected easily and reliably while avoiding interference between the pivot frame 23 and the joining flange. it can.

Referring to FIGS. 12 and 13, the first front cross member 31 connecting the front ends of the left and right seat rails 30 to each other forms a stay portion 31a extending forward and abutting on the upper wall 22b of the main frame 22. ing. The front end portions of the left and right seat rails 30 and the upper wall portion 22 b of the main frame 22 are integrally joined via the first front cross member 31. The first front cross member 31 is provided with a notch 31 b which avoids the upper joint flange 42 d of the main frame 22.

The front end portions of the left and right seat rails 30 form a front extension 30e1 and a lower extension 30e2 in order to secure a welding length with respect to the left and right outer side walls 22a of the main frame 22. The front extension 30e1 and the lower extension 30e2 are provided flush with the upper and lower joining

flanges

45d and 45e of the seat rail 30, and the lower ends thereof are integrated with the left and right outer side walls 22a of the main frame 22 by, for example, arc welding. Bonded to. By joining the front extension 30e1 and the lower extension 30e2 to the main frame 22, the welding strength of the front end of the seat rail 30 is enhanced. As a result, even if a moment that causes the seat rail 30 to swing up and down around its front end acts on the seat rail 30 due to the load input to the seat rail 30, the bonding strength against the moment is secured.

The second front cross member 32 connecting the front and rear middle portions of the left and right seat rails 30 to each other is provided at the rear of the first front cross member 31 so as to be separated. The second front cross member 32 is provided with a tank support portion 32 a that supports the rear end portion of the fuel tank 15. The first front cross member 31 and the second front cross member 32 are integrated through a connecting portion 40 disposed between the left and right seat rails 30. The connecting portion 40 has a pair of left and right connecting pieces 40 a extending along the upper bonding flanges 45 d of the left and right seat rails 30. An opening 40 b is formed between the left and right connecting pieces 40 a. The first front cross member 31, the second front cross member 32, and the connecting portion 40 (left and right connecting pieces 40a) are configured as an integral cross member member 40C.

The left and right connecting pieces 40 a have a gap between the left and right seat rails 30 and are not joined to the left and right seat rails 30. As a result, the welding cost is reduced and the influence of welding distortion on the first and second

front cross members

31 and 32 is suppressed. The first and second

front cross members

31 and 32 are integrated with each other while being separated from each other via the non-joining region R1 with respect to the seat rail 30.

The structure of the connecting portion 40 is not limited to the structure having the pair of connecting pieces 40a extending along the inner side of the left and right seat rails 30 in the vehicle width direction. There may be various configurations in which the first and second

front cross members

31 and 32 are coupled, such as a configuration having a single coupling piece.

Thus, the vehicle body frame structure in the present embodiment includes the head pipe 21, the main frame 22 extending to the rear of the head pipe 21, the plurality of seat rails 30 extending to the rear of the main frame 22, and the plurality of sheets And a plurality of

cross members

31 and 32 connected between the rails 30. The plurality of

cross members

31 and 32 are separated from each other through the non-bonding area R1 with respect to the seat rail 30, and are integrated with each other through the connecting portion 40 disposed in the non-bonding area R1.

According to this configuration, since the plurality of

cross members

31 and 32 separated from each other are integrated through the connecting portion 40, the number of parts and the number of assembling steps can be reduced. In addition, the plurality of

cross members

31 and 32 and the connecting portion 40 can be integrally formed as an integral member, and the accuracy of the relative position between the plurality of

cross members

31 and 32 can be enhanced.

In the vehicle body frame structure, the connecting portion 40 has a plurality of connecting pieces 40a along the plurality of seat rails 30, and an opening 40b formed between the plurality of connecting pieces 40a. There is.
According to this configuration, weight reduction can be achieved when the plurality of

cross members

31 and 32 and the connecting portion 40 are integrated into one member, and reinforcement of the seat rail 30 can be achieved by the connecting piece 40 a.

Further, in the vehicle body frame structure, the plurality of

cross members

31 and 32 are respectively disposed between the front end portions of the plurality of seat rails 30 and between the front and rear intermediate portions.
According to this configuration, the front end portions of the plurality of seat rails 30 connected to the main frame 22 are solidified by the cross member 31, and the front and rear intermediate portions in which bending stress is easily generated in the seat rail 30 are reinforced by the cross member 32. it can.

Further, in the vehicle body frame structure, the cross member 31 provided between the front end portions of the plurality of seat rails 30 has a stay portion 31 a joined to the main frame 22.
According to this configuration, the joint strength between the front end portion of the seat rail 30 and the main frame 22 can be enhanced. Further, the seat rail 30 and the main frame 22 can be easily positioned by the stay portion 31a.

Further, in the vehicle body frame structure, the cross member 32 provided between the front and rear middle portions of the plurality of seat rails 30 has a tank support portion 32 a for supporting the fuel tank 15.
According to this configuration, the functionality can be improved by providing the tank support portion 32 a for the fuel tank 15 at the front and rear intermediate portion of the seat rail 30.

The present invention is not limited to the above embodiment. For example, the saddle-ride type vehicle includes all vehicles on which the driver straddles the vehicle body, and motorcycles (motor bike and scooter type vehicles Not only three wheels (including one front wheel and two rear wheels but also front two rear wheels and one rear wheel) or four-wheeled vehicles are included.
The configuration in the above embodiment is an example of the present invention, and various modifications can be made without departing from the scope of the present invention, such as replacing the components of the embodiment with known components.

1 Motorcycles (saddle-type vehicles)
Reference Signs List 15 fuel tank 20 body frame 21 head pipe 22 main frame 23 pivot frame 30 seat rail 31 first front cross member (cross member)
31a stay portion 32 second front cross member (cross member)
32a Tank support 22cs closed cross section (first closed cross section)
23cs closed cross-section (second closed cross-section)
30cs Closed cross-sectional structure 35e Narrowing part (cross-sectional reduction part)
37 curved portion 40 connecting portion 40 a connecting piece 40 b opening 42 bs bulging shape (first bulging shape)
43bs bulging shape (second bulging shape)
45bs bulging

shape part

42d, 42e connecting flange 42L, 42R left and right main press frame body (first press frame body)
43L, 43R left and right pivot press frame body (second press frame body)
45I, 45O inner and outer sheet press frame body (press frame body)
45e Lower Joint Flange (Joint Flange)
45e5 Panel bend 47

Connection

48d, 49d Weld hole (opening)
R1 Non-joint area sp Spot weld (joint)

Claims

With the head pipe,
A main frame extending to the rear of the head pipe;
A plurality of seat rails extending rearward of the main frame;
A plurality of cross members connecting the plurality of seat rails;
The plurality of cross members are separated from each other through a non-joining area with respect to the seat rail, and are integrated with each other through a connecting portion disposed in the non-joining area.
Body frame structure.
The connecting portion has a plurality of connecting pieces along the plurality of seat rails, and an opening formed between the plurality of connecting pieces.
The vehicle body frame structure according to claim 1.
The plurality of cross members are respectively disposed between the front ends of the plurality of seat rails and between the front and rear middle portions.
The vehicle body frame structure according to claim 1 or 2.
The cross member provided between the front ends of the plurality of seat rails has a stay portion joined to the main frame,
The vehicle body frame structure according to any one of claims 1 to 3.
The cross member provided between the front and rear middle portions of the plurality of seat rails has a tank support portion for supporting the fuel tank.
The vehicle body frame structure according to any one of claims 1 to 4.