JP2011162018A - Vehicle body frame structure of saddle-riding type vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the rigidity around a head pipe without increasing the size of a frame around the head pipe in a vehicle body frame structure of a saddle-riding type vehicle. <P>SOLUTION: The vehicle body frame structure of the saddle-riding type vehicle includes a head pipe 3 having an inner cylindrical part 71, an upper connection part 72, and a lower connection part 73, an outer cylindrical member 75 arranged in the inner cylindrical part 71 via a space part S, and welded to the upper connection part 72 and the lower connection part 73, and a pair of right and left main frames 10 connected to the head pipe 3. The main frames 10 are welded to the inner cylindrical part 71 and the upper connection part 72, and to the inner cylindrical part 71 and the lower connection part 73. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a body frame structure of a saddle-ride type vehicle provided with a head pipe.

  Conventionally, in a vehicle body frame structure of a saddle-ride type vehicle, the head pipe includes an inner cylinder portion that surrounds the steering shaft, and an outer cylinder portion that includes front and rear divided cylinder bodies that are disposed in the inner cylinder portion via a gap portion, A double pipe structure comprising an upper connecting part that connects the upper ends of the inner cylinder part and the outer cylinder part, and a lower connecting part that connects the lower ends of the inner cylinder part and the outer cylinder part. The structure which welded is disclosed (for example, refer patent document 1). According to the structure of Patent Document 1, the upper connecting portion and the lower connecting portion are formed with the required rigidity, and the inner tube portion and the outer tube portion are firmly connected, so that the head pipe periphery It is possible to reduce the weight while increasing the rigidity.

JP 2006-231958 A

However, in the body frame structure of the conventional saddle-ride type vehicle, when further increasing the rigidity around the head pipe, the upper connecting portion and the lower connecting portion are increased in diameter, the outer tube portion is increased in thickness, the head pipe It is conceivable that the length around the head pipe becomes large and the frame around the head pipe becomes large. For this reason, it becomes a subject to obtain the vehicle body frame structure which can improve rigidity, without causing the enlargement of the flame | frame around a head pipe.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve the rigidity around the head pipe without causing an increase in the size of the frame around the head pipe in the body frame structure of the saddle-ride type vehicle. And

In order to achieve the above object, the present invention has an inner cylinder portion surrounding the steering shaft, an upper connection portion connected to the upper end of the inner cylinder portion, and a lower connection portion connected to the lower end of the inner cylinder portion. And a head pipe that rotatably supports the steering shaft, an outer cylinder member that is disposed in the inner cylinder part via a gap part and is welded to the upper connection part and the lower connection part, In a vehicle body frame structure of a saddle-ride type vehicle including a pair of left and right main frame members connected to the head pipe, the main frame member may be the inner cylinder part and the upper connection part, or the inner cylinder part and the lower part. It is welded to at least one of the connecting portions.
According to this configuration, the outer tube member is provided in the inner tube portion via the gap portion, the head pipe has a double tube structure, and the main frame member is the inner tube portion and the upper connecting portion, or the inner tube portion and the lower portion. It is welded to at least one of the connecting portions. Therefore, the main frame member can be firmly welded to the head pipe so as to straddle at least one of the inner cylinder portion and the upper connecting portion, or the inner cylinder portion and the lower connecting portion, while being reinforced with the outer cylinder member. The rigidity around the head pipe can be improved without increasing the size of the frame.

Further, in the above configuration, the outer cylinder member is provided as a plate member having an arcuate cross section in front of the inner cylinder part, and has an outer shape between the upper connecting part and the inner cylinder part at an upper part of the main frame member. And an upper step part welded to the upper connecting part and the inner cylinder part is provided, and along the outer shape of the lower connection part and the inner cylinder part at the lower part of the main frame member, the lower part A lower step portion welded to the connecting portion and the inner cylinder portion may be provided.
In this case, an outer cylinder member is provided in front of the inner cylinder part, the head pipe has a double pipe structure, and is welded to the upper part of the main frame member along the outer shape of the upper connecting part and the inner cylinder part. A lower step portion welded along the outer shape of the lower connecting portion and the inner cylinder portion, and the head pipe serving as an upper connecting portion, an inner cylinder portion, and a lower connecting portion. And is welded to the main frame member. For this reason, the main frame member can be firmly welded to the head pipe via the upper step portion and the lower step portion while reinforcing the front side with the outer cylinder member, without causing an increase in the size of the frame around the head pipe, The rigidity around the head pipe can be improved.
Further, the main frame member is a hollow member having a closed cross-sectional structure, the upper stepped portion has an upper front stepped portion and an upper rear stepped portion having different positions in the front-rear direction, and the lower stepped portion is front-rear. It is good also as a structure which has a lower front side step part and a lower back side step part from which a position differs in a direction.
In this case, the main frame member is formed of a hollow member, the upper step has an upper front step and an upper rear step, and the lower step has a lower front step and a lower rear step. Since the main frame member is welded to the head pipe at different positions in the front-rear direction, the weld length can be increased and the rigidity around the head pipe can be further improved.

Further, the side rear edge of the outer cylinder member may be welded to the side surface of the main frame member.
In this case, by welding the side rear edge of the outer cylinder member to the side surface of the main frame member, the welded portion between the outer cylinder member, the head pipe and the main frame member can be closed, and the rigidity around the head pipe is improved. it can.

Further, between the pair of left and right main frame members, the head pipe and a gusset member for connecting the left and right main frame members are provided, and the gusset member has a reinforcing plate portion along the vehicle front-rear direction, At the front part of the reinforcing plate part, along the outer shape of the upper connecting part and the inner cylinder part, an upper reinforcing step part welded to the upper connecting part and the inner cylinder part, the lower connecting part and the Along with the outer shape of the inner cylinder part, a lower reinforcing step part welded to the lower connecting part and the inner cylinder part may be provided.
In this case, the gusset member provided between the left and right main frame members has a reinforcing plate portion extending in the front-rear direction, and the upper reinforcing step portion and the lower reinforcing step portion provided at the front portion of the reinforcing plate portion are the head pipe. Therefore, the rigidity around the head pipe can be improved.

The main frame member includes an upper main frame member, a lower main frame member provided below the upper main frame member, and an intermediate frame that connects the upper main frame member and the lower main frame member. And an inner space of the lower main frame member may be configured as a reservoir tank of the radiator.
In this case, by configuring the main frame member with a plurality of members, the degree of freedom when adjusting the rigidity of the frame can be improved. Further, since the volume in the lower main frame member is increased by the lower step portion, it is possible to easily secure the capacity when the inner space of the lower main frame member is used as a reservoir tank of the radiator.

In the vehicle body frame structure of a saddle-ride type vehicle according to the present invention, an outer cylinder member is provided in the inner cylinder part via a gap, the head pipe has a double pipe structure, and the main frame member is connected to the inner cylinder part and the upper part. Or at least one of the inner tube portion and the lower connecting portion. Therefore, the main frame member can be firmly welded to the head pipe so as to straddle at least one of the inner cylinder portion and the upper connecting portion, or the inner cylinder portion and the lower connecting portion, while being reinforced with the outer cylinder member. The rigidity around the head pipe can be improved without increasing the size of the frame.
In addition, the main frame member can be firmly welded to the head pipe via the upper step portion and the lower step portion while the front side is reinforced with the outer cylinder member, and the size of the frame around the head pipe is not increased. The rigidity around the pipe can be improved.

In addition, the upper step portion has an upper front step portion and an upper rear step portion, the lower step portion has a lower front step portion and a lower rear step portion, and the main frame member is attached to the head pipe. Since the welding is performed at the portions having different positions in the front-rear direction, the weld length can be made longer, and the rigidity around the head pipe can be further improved.
Also, by welding the side rear edge of the outer cylinder member to the side surface of the main frame member, the welded portion between the outer cylinder member, the head pipe and the main frame member can be closed, and the rigidity around the head pipe can be improved. .

Furthermore, the gusset member has a reinforcing plate portion along the front-rear direction, and the upper reinforcing step portion and the lower reinforcing step portion provided at the front portion of the reinforcing plate portion are welded along the outer shape of the head pipe, The rigidity around the head pipe can be improved.
Moreover, the freedom degree at the time of adjusting the rigidity of a flame | frame can be improved by comprising a main frame member with a some member. Furthermore, since the volume in the lower main frame member is increased by the lower step portion, it is possible to easily secure the capacity when the inner space of the lower main frame member is used as a reservoir tank of the radiator.

It is a left view which shows the saddle-riding type vehicle provided with the vehicle body frame structure which concerns on embodiment of this invention. It is sectional drawing of the vicinity of a head pipe. It is a left view of a vehicle body frame. It is the top view which looked at the body frame from the upper part. It is the top view which looked at the upper main frame member from the upper part. It is a side view of a left upper main frame member. It is the front view which looked at the front part of the body frame from the direction which intersects perpendicularly with the axis of a head pipe. It is the top view which looked at the lower main frame member from the upper part. It is a side view of the lower main frame member on the left side. It is the top view and left view which show a gusset member. It is a left view which shows the welding location around a head pipe. It is XII-XII sectional drawing in FIG. It is XIII-XIII sectional drawing in FIG. It is XIV-XIV sectional drawing in FIG. It is XV-XV sectional drawing in FIG. It is XVI-XVI sectional drawing in FIG. It is XVII-XVII sectional drawing in FIG.

Hereinafter, a saddle-ride type vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the up / down, front / rear, and left / right directions are directions seen from the driver of the vehicle.
FIG. 1 is a left side view showing a saddle-ride type vehicle having a body frame structure according to an embodiment of the present invention.
A saddle-ride type vehicle 1 includes a body frame 2, a pair of left and right front forks 4 that are slidably supported by a head pipe 3 at the front of the body frame 2, and an upper end portion of these front forks 4. A steering handle (not shown) disposed at the top of the vehicle, a front wheel 5 rotatably supported by the front fork 4, an engine 6 supported by the vehicle body frame 2 at the approximate center of the vehicle body, and the vehicle body frame 2 A swing arm 7 supported so as to be swingable up and down, a rear wheel 8 rotatably supported on the rear portion of the swing arm 7, and a fuel tank 9 disposed above the body frame 2. Yes.

The body frame 2 includes a main frame 10 (main frame member) provided in a pair of left and right in the vehicle width direction, and a pair of left and right pivot plates 11 extending downward from the rear end of each main frame 10.
The pivot plate 11 is provided with a pivot shaft 12 penetrating in the vehicle width direction, and the swing arm 7 is supported so as to be swingable up and down around the pivot shaft 12. The upper end of the rear cushion unit 13 is attached to the upper part of the front portion of the swing arm 7, and the lower end of the rear cushion unit 13 is connected to the pivot plate 11 via a link mechanism 14 provided at the lower end of the pivot plate 11. ing.

The engine 6 is a V-type 5-cylinder engine, is supported by the vehicle body frame 2, and is positioned below the main frame 10. The cylinder head 21 on the front side of the engine 6 is provided with exhaust pipes 22, 23, 24 for each cylinder. The exhaust pipes 22, 23, 24 extend rearward and gather into one, and are arranged at the rear part on the right side of the vehicle. The right muffler 25 is connected. The cylinder head 26 on the rear side of the engine 6 is provided with exhaust pipes 27 and 28 for each cylinder. The exhaust pipes 27 and 28 extend rearward and are connected to a central muffler 29 provided at the center of the rear portion of the vehicle.
An oil pan 31 is provided below the crankcase 30 that houses a crankshaft (not shown).

A radiator 32 through which cooling water of the engine 6 circulates is disposed in front of the engine 6. The radiator 32 is located between the front wheel 5 and the engine 6 and extends up and down from the lower portion of the head pipe 3 to the lower portion of the engine 6.
The battery 16 is provided between the lower end of the radiator 32 and the oil pan 31 and is positioned below the crankcase 30.
The fuel tank 9 includes a fuel pump 9 </ b> A that supplies fuel to the engine 6.

  The saddle-ride type vehicle 1 is a full cowling type vehicle whose vehicle body is covered with a vehicle body cover 33. The vehicle body cover 33 includes an upper cowl 34 that covers the front of the head pipe 3, a middle cowl 35 that covers the side of the engine 6, and The lower cowl 36, the tank cover 37 that covers the front part of the fuel tank 9, and the seat cowl 38 that extends from the rear part of the main frame 10 to the rear part of the vehicle. The seat cowl 38 is provided with a seat 39 on which the driver is seated. The front fork 4 is provided with a front fender 40 that covers the upper side of the front wheel 5.

FIG. 2 is a cross-sectional view of the vicinity of the head pipe 3.
The head pipe 3 includes a cylindrical inner cylinder portion 71 that surrounds the steering shaft 70, an upper connection portion 72 that is connected to the upper end of the inner cylinder portion 71, and a lower connection portion 73 that is connected to the lower end of the inner cylinder portion 71. A head pipe body 74 having an outer cylinder member 75 and an outer cylinder member 75 covering the front portion of the inner cylinder portion 71.
The upper connecting portion 72 and the lower connecting portion 73 are each formed in a cylindrical shape having a larger diameter than the inner cylindrical portion 71, and are provided coaxially with the central axis of the inner cylindrical portion 71. The outer diameters of the upper connecting portion 72 and the lower connecting portion 73 are substantially the same. The head pipe 3 is formed with a recessed portion 3 </ b> A in which the outer peripheral surface of the inner cylinder portion 71 is recessed over the entire periphery of the upper connecting portion 72 and the lower connecting portion 73.

  On the outer surface side of the head pipe main body 74, boundaries between the inner cylinder portion 71, the upper connecting portion 72, and the lower connecting portion 73 are formed in a step shape, which forms an annular upper flange portion 74A and a lower flange portion 74B. The upper flange portion 74A and the lower flange portion 74B are provided so as to go around the outer peripheral side of the inner cylinder portion 71 and face each other. The outer cylinder member 75 is a plate member that connects the upper flange portion 74A and the lower flange portion 74B, is provided in the recess 3A, and is formed so as to cover only the front portion side of the head pipe main body 74. The outer cylinder member 75 is formed in a circular arc shape by curving a rectangular plate material into a bowl shape. It is substantially the same as the radius of curvature of the diameter portion.

The upper connecting portion 72 and the lower connecting portion 73 are respectively formed with concave accommodating portions 76A and 76B, and ring-shaped bearing holders 77 are respectively disposed in the accommodating portions 76A and 76B. Bearings 78 and 79 that support the upper and lower portions of the steering shaft 70 are supported by a bearing holder 77, respectively.
The steering shaft 70 is provided through the head pipe 3, and the upper end and the lower end of the steering shaft 70 are provided across the left and right front forks 4 and are connected to a top bridge 81 and a bottom bridge 82 that support the front fork 4, respectively. . A steering handle is attached to the top of the top bridge 81.

FIG. 3 is a left side view of the vehicle body frame 2. FIG. 4 is a plan view of the body frame 2 as viewed from above.
As shown in FIGS. 3 and 4, the main frames 10 and 10 are provided in a pair of left and right substantially symmetrical shapes, branch left and right from the head pipe 3 at the front of the vehicle, and widen up to the middle part before and after the rear. After that, the width gradually becomes narrower as it extends rearward, and the rear end portion is joined to the upper portions of the pivot plates 11 and 11 by welding. The head pipe 3 is provided so as to be inclined rearward according to the caster angle, and the main frames 10 and 10 extend rearward and downward so as to be orthogonal to the axial direction of the head pipe 3.
A cross member 15 that connects the pivot plates 11 and 11 is provided at the lower end of the pivot plates 11 and 11. The cross member 15 is formed with a link connecting portion (not shown) to which the link mechanism 14 is connected.

The main frames 10 and 10 are formed by welding a plurality of members, and an upper main frame member 41 extending from the head pipe 3 to the pivot plate 11 and a lower main frame member 42 provided below the upper main frame member 41. The intermediate frame member 43 that connects the upper main frame member 41 and the lower main frame member 42 is provided.
The upper main frame member 41 has an upper frame main body 44 that connects the upper part of the head pipe 3 and the upper part of the pivot plate 11, and the rear end of the upper frame main body 44 welds the main frame 10 to the pivot plate 11. This is the rear joint 44A. A branch frame portion 46 that branches off from the upper frame main body portion 44 and extends forward below the upper frame main body portion 44 is provided from the rear joint portion 44 </ b> A. It extends to the middle part. The upper main frame member 41 is formed in a tube shape having a substantially rectangular cross section, and is a hollow member having a closed cross section structure.

  The lower main frame member 42 is formed in a substantially inverted L shape in a side view, and is bent from the lower frame rear joint portion 45 joined by welding to the front end of the branch frame portion 46 and the upper portion of the lower frame rear joint portion 45. And a lower frame base 47 joined to the lower portion of the head pipe 3. The lower frame base 47 is provided below the upper frame main body 44 and substantially parallel to the upper frame main body 44 with a space between the lower frame base 44 and the upper frame main body 44. The lower main frame member 42 is formed in a tube shape having a substantially rectangular cross section, and is a hollow member having a closed cross section structure.

  The intermediate frame member 43 includes an outer intermediate frame member 48 provided on the outer surface side of the main frame 10 and an inner intermediate frame member 49 (see FIG. 12) provided on the inner surface side of the main frame 10. The outer intermediate frame member 48 and the inner intermediate frame member 49 are plate-like members provided so as to close the gap between the upper frame main body portion 44 and the lower frame base portion 47. On each of the outer surface side and the inner surface side, It joins to the lower edge of the upper frame main-body part 44 and the upper edge of the lower frame base 47 by welding.

The intermediate frame member 43 is provided with a cross pipe 50 that penetrates the left and right intermediate frame members 43 in the vehicle width direction, and the cross pipe 50 is welded to the intermediate frame member 43.
The rear end of the intermediate frame member 43 is located in the vicinity of the front end of the branch frame portion 46, and the main frame 10 is disposed in the vehicle width direction between the upper frame main body portion 44 and the branch frame portion 46 behind the intermediate frame member 43. A through opening 10A is formed. An intake port (not shown) of the intake device of the engine 6 is disposed so as to face the outer surface from the opening 10A.
A gusset member 51 is provided between the main frames 10 and 10 to connect the front portions of the left and right main frames 10 and 10 to each other.

As shown in FIG. 3, cowl stays 83 </ b> A and 83 </ b> B used for attaching the upper cowl 34 are provided at the front portions of the upper connecting portion 72 and the lower connecting portion 73 of the head pipe 3. The outer cylinder member 75 is provided at the front portion of the head pipe 3.
A pair of handle stoppers 85 are provided on the lower edges of the left and right lower frame bases 47 to restrict the rotation range of the steering shaft 70 by coming into contact with the convex portions of the bottom bridge 82. A side surface portion of the handle stopper 85 is a radiator mount portion 85 </ b> A that supports the upper portion of the radiator 32. The lower frame rear joint 45 is provided with a cowl stay 83C for the middle cowl 35.
The left and right outer intermediate frame members 48 are provided with steering damper fixing portions 84 to which a pair of left and right steering dampers (not shown) are attached. On the upper surface of the gusset member 51, a stay 83D for the tank cover 37 and a ground attachment portion 89 are provided.

  Cowl stays 83E and 83F for the seat cowl 38 are provided on the upper portion of the rear joint portion 44A and the upper portion of the pivot plate 11. At the rear edge of the pivot plate 11, there are provided a step holder fixing portion 86 to which a step holder (not shown) for supporting a driver's step is fixed, and cowl stays 83 </ b> G and 83 </ b> H for the lower cowl 36. The pivot plate 11 is formed with a pivot hole 11A that supports the pivot shaft 12.

  The engine 6 is connected to the vehicle body frame 2 at four hanger portions, a first hanger portion 86A is provided at the lower end of the lower frame rear joint portion 45, and a second hanger portion 86B is provided at the branch frame portion 46. A third hanger portion 86C and a fourth hanger portion 86D are provided on the upper and lower portions of the pivot plate 11, respectively.

  A tube connecting portion 87 is provided on the front surface of the lower end of the lower frame rear joint portion 45, and a cooling water tube 32 </ b> A connected to the radiator 32 is connected to the tube connecting portion 87. That is, the inside of the lower main frame member 42 is connected to the radiator 32 via the cooling water tube 32 </ b> A, and the lower main frame member 42 is configured to function as a reservoir tank of the radiator 32. When the cooling water of the radiator 32 becomes hot and the pressure rises, the cooling water is stored in the lower main frame member 42 that functions as a reservoir tank.

  As shown in FIGS. 3 and 4, the right main frame 10 is provided with a communication pipe 88 communicating with the inside and outside of the main frame 10, and the communication pipe 88 is connected to the cylinder heads 21 and 26 via a tube 88A. ing. The main frame 10 communicates with the cylinder heads 21 and 26 via the communication pipe 88 and the tube 88A, and the inside of the main frame 10 functions as an oil catch tank.

FIG. 5 is a plan view of the upper main frame member 41 as viewed from above. FIG. 6 is a side view of the upper main frame member 41 on the left side. FIG. 7 is a front view of the front portion of the vehicle body frame 2 as viewed from a direction orthogonal to the axis of the head pipe 3. Here, in FIG.5 and FIG.6, the head pipe 3 is shown with the dashed-two dotted line.
As shown in FIGS. 5 to 7, the upper main frame member 41 is provided in a pair of left and right, and is configured substantially symmetrically about the head pipe 3. Each upper main frame member 41 is formed in a hollow tube shape by joining a bowl-like long material 41A and a long material 41B having a substantially U-shaped cross section divided into left and right, and the cross-sectional shape is substantially rectangular. It has become. The long material 41A is located on the outer side of the main frame 10, and the long material 41B is located on the inner side.
As shown in FIG. 5, on the upper surface and the lower surface of the upper main frame member 41, a welded portion 41 </ b> C between the long material 41 </ b> A and the long material 41 </ b> B is located in the middle portion in the width direction, and the welded portion 41 </ b> C is in the longitudinal direction. It extends to.

The upper frame main body 44 of the upper main frame member 41 is joined to the head pipe 3 so as to sandwich the head pipe 3 from the left and right side surfaces. A head pipe upper joint 55 is formed at the tip of the upper frame main body 44, and the upper frame main body 44 is welded to the head pipe 3 via the head pipe upper joint 55.
The head pipe upper joint portion 55 is formed at the tip of a tube-shaped upper frame main body 44 having an open end, and the cross-sectional shape is exposed to the head pipe 3 side. The head pipe upper joint portion 55 has an upper step portion 56 formed in a step shape so that the upper portion thereof is cut out and the lower portion protrudes toward the head pipe 3 side. The upper step portion 56 is located at the upper portion of the main frame 10 and is formed in a step shape along the outer shape of the upper connecting portion 72 and the inner cylinder portion 71 of the head pipe 3, and the upper flange portion 74 </ b> A of the head pipe 3. Is provided so as to support the head pipe 3 from below.

More specifically, the upper step portion 56 is connected to the upper inner cylinder joint portion 57 welded to the upper outer surface 71A of the inner cylinder portion 71 below the upper flange portion 74A and the upper flange portion 74A of the head pipe 3 from below. It has an upper flange joint 58 that is welded to the upper flange 74 </ b> A in a contact state, and an upper outer peripheral joint 59 that is welded to the outer peripheral 72 </ b> A of the upper connecting portion 72.
The upper inner cylinder joint portion 57 and the upper outer peripheral surface joint portion 59 are each formed in an arc shape along the shapes of the outer surface 71A and the outer peripheral surface 72A in plan view.

The upper flange joint 58 has an upper front stepped portion 58A and an upper rear stepped portion 58B provided at different positions in the front-rear direction. The upper front step portion 58A is welded to the front portion of the upper flange portion 74A and is formed on the long material 41A. The upper rear step portion 58B is welded to the rear portion of the upper flange portion 74A and is formed on the long material 41B.
Further, the front end portion of the upper front side step portion 58 </ b> A and the upper inner cylinder joint portion 57 has an extension portion 56 </ b> A that protrudes so as to go around to the curved surface portion of the front portion of the inner cylinder portion 71.

FIG. 8 is a plan view of the lower main frame member 42 as viewed from above. FIG. 9 is a side view of the lower main frame member 42 on the left side. Here, in FIG.8 and FIG.9, the head pipe 3 is shown with the dashed-two dotted line. Further, FIG. 8 shows only the lower main frame member 42 on the left side.
As shown in FIGS. 7 to 9, the lower main frame member 42 is provided in a pair of left and right sides, and is configured to be substantially symmetrical with respect to the head pipe 3. The lower main frame member 42 on the right side is substantially symmetrical with the lower main frame member 42 on the left side, and is not shown in FIG.
Each lower main frame member 42 is formed into a hollow tube shape by joining a long member 42A and a long member 42B having a substantially U-shaped cross section divided into left and right parts, and the sectional shape is substantially the same. It is a rectangle. The long material 42A is located on the outer side of the main frame 10, and the long material 42B is located on the inner side.
As shown in FIG. 8, on the upper surface and the lower surface of the lower main frame member 42, a welded portion 42 </ b> C between the long material 42 </ b> A and the long material 42 </ b> B is located in the middle portion in the width direction, and the welded portion 42 </ b> C is a longitudinal portion. Extends in the direction.

The lower frame base 47 of the lower main frame member 42 is joined to the head pipe 3 so as to sandwich the head pipe 3 from the left and right side surfaces. A head pipe lower joint 61 is formed at the tip of the lower frame base 47, and the lower frame base 47 is welded to the head pipe 3 via the head pipe lower joint 61.
The head pipe lower joint portion 61 is formed at the tip of a tube-like lower frame base 47 having an open end, and the cross-sectional shape is exposed to the head pipe 3 side. The head pipe lower joint portion 61 has a lower step portion 62 that is formed in a step shape so that the lower portion is cut out and the upper portion protrudes toward the head pipe 3 side. The lower step portion 62 is located at the lower portion of the main frame 10 and is formed in a step shape along the outer shape of the lower connecting portion 73 and the inner cylinder portion 71 of the head pipe 3. By engaging with 74B, the head pipe 3 is provided to be supported from above.

Specifically, the lower step portion 62 abuts the lower flange portion 74B from above and the lower inner cylinder joint portion 63 welded to the lower outer surface 71B of the inner cylinder portion 71 above the lower flange portion 74B. The lower flange joint portion 64 is welded to the lower flange portion 74B in the state, and the lower outer peripheral surface joint portion 65 is welded to the outer peripheral surface 73A of the lower connection portion 73.
The lower inner cylinder joint portion 63 and the lower outer peripheral surface joint portion 65 are each formed in an arc shape along the shapes of the outer surface 71B and the outer peripheral surface 73A in plan view.

The lower flange joint portion 64 includes a lower front step portion 64A and a lower rear step portion 64B that are provided at different positions in the front-rear direction. The lower front step portion 64A is welded to the front portion of the lower flange portion 74B and is formed on the long material 42A. The lower rear stepped portion 64B is welded to the rear portion of the lower flange portion 74B and is formed on the long material 42B.
Further, the front end portions of the lower front side step portion 64 </ b> A and the lower inner cylinder joint portion 63 have extension portions 62 </ b> A that protrude so as to go around to the curved surface portion of the front portion of the inner cylinder portion 71. Since the volume in the lower main frame member 42 is increased by the extension 62A, the capacity when the lower main frame member 42 is used as a reservoir tank of the radiator 32 can be increased as much as possible. it can.

10A and 10B are views showing the gusset member 51. FIG. 10A is a plan view and FIG. 10B is a left side view. 10A, the head pipe 3 and the upper main frame member 41 are indicated by a two-dot chain line, and in FIG. 10B, the head pipe 3 is indicated by a two-dot chain line.
As shown in FIGS. 7 and 10, the gusset member 51 is provided across the upper plate portion 90 provided across the upper surfaces of the left and right upper main frame members 41 and the lower surface of the left and right lower main frame members 42. Provided between the lower plate portion 91, the reinforcing plate portion 92 that connects the upper plate portion 90 and the lower plate portion 91, and the rear edge portion of the upper plate portion 90 and the rear edge portion of the lower plate portion 91. And a rear plate portion 93.

The upper plate portion 90 is formed in a substantially triangular shape in accordance with the shape of the vehicle body frame 2 behind the head pipe 3 and is welded to the outer peripheral surface 72A of the rear portion of the upper connecting portion 72 of the head pipe 3. And left and right side edge portions 90B welded to the upper surface of the upper main frame member 41.
The lower plate portion 91 is formed in a substantially triangular shape in accordance with the shape of the vehicle body frame 2 behind the head pipe 3 and is welded to the outer peripheral surface 73A of the rear portion of the lower connecting portion 73 of the head pipe 3. And left and right side edge portions 91B welded to the lower surface of the lower main frame member 42.

The rear plate portion 93 is provided with a central portion in the width direction curved toward the head pipe 3 side, and between the left and right main frames 10 and 10 so as to close the rear portion of the space between the upper plate portion 90 and the lower plate portion 91. It is provided to the full width.
The reinforcing plate portion 92 is fixed by welding an upper end 92A and a lower end 92B to the upper plate portion 90 and the lower plate portion 91, respectively. The lower plate portion 91 has a curved portion 91C curved upward at the center in the vehicle width direction, and the lower end 92B of the reinforcing plate portion 92 is welded to the curved portion 91C. Further, the rear edge portion 92 </ b> C of the reinforcing plate portion 92 is welded to the rear plate portion 93.
The reinforcing plate portion 92 is provided with a plurality of embossed portions 94 to enhance rigidity. Further, a hole 95 through which the cross pipe 50 passes is formed in the reinforcing plate portion 92.

The reinforcing plate portion 92 is a plate member disposed so as to extend along the front-rear direction of the vehicle, and is provided in the center between the left and right main frames 10 and 10 and welded to the rear portion of the head pipe 3.
As shown in FIG. 10B, the reinforcing plate portion 92 is formed with a front edge protruding portion 97 in which the upper and lower intermediate portions of the front edge of the reinforcing plate portion 92 protrude to the front side. An upper reinforcing step portion 150 formed in a step shape along the outer shape of the upper connecting portion 72 and the inner cylindrical portion 71 is provided at the upper portion of the upper connecting portion 72, and the lower connecting portion 73 and the lower portion of the front edge protruding portion 97 are provided. A lower reinforcing step portion 160 formed in a step shape so as to follow the outer shape of the inner cylinder portion 71 is provided.

The upper reinforcing step portion 150 is welded to the front edge portion 96A welded to the upper connecting portion 72, the upper edge portion 97A welded to the upper flange portion 74A of the head pipe 3, and the outer peripheral surface of the inner cylinder portion 71. It has a front end 97C.
The lower reinforcing step portion 160 is welded to the front edge portion 96B welded to the lower connecting portion 73, the lower edge portion 97B welded to the lower flange portion 74B of the head pipe 3, and the outer peripheral surface of the inner cylinder portion 71. Front end 97C.

  That is, the reinforcing plate portion 92 is assigned to the rear portion of the head pipe 3, and the upper reinforcing step portion 150, the lower reinforcing step portion 160, and the front end 97C are welded along the axial direction of the head pipe 3. For this reason, the rigidity of the vehicle body frame 2 around the head pipe 3 can be greatly improved by the reinforcing plate portion 92 with respect to the force applied in the front-rear direction and the axial direction of the head pipe 3. Further, the front edge protruding portion 97 is engaged with the recess 3A of the head pipe 3, and the upper edge portion 97A and the lower edge portion 97B are welded to the upper flange portion 74A and the lower flange portion 74B. Since the upper flange portion 74A and the lower flange portion 74B are supported by the edge portion 97B, the rigidity against the force applied in the axial direction of the head pipe 3 can be further improved.

FIG. 11 is a left side view showing the welding locations around the head pipe 3. 12 is a cross-sectional view taken along line XII-XII in FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG. Here, in FIG. 11, the outer cylinder member 75 is shown with the dashed-two dotted line.
As shown in FIGS. 11 to 14, the upper main frame member 41 is closed at the distal end portion of the upper step portion 56 by an upper inner cylinder joint portion 57, an upper flange joint portion 58 and an upper outer peripheral surface joint portion 59. The closed cross section is joined to the head pipe 3 by a welded portion 100 that is continuously formed on portions of the head pipe 3 that are in contact with the upper outer surface 71A, the upper flange portion 74A, and the outer peripheral surface 72A.

  Since the welded portion 100 is provided across the upper connecting portion 72 and the inner cylindrical portion 71 and is also continuously welded to the upper flange portion 74A, the weld length of the head pipe upper joint portion 55 can be increased, and the welded portion 100 is firmly joined. can do. In addition, since the welded portion 100 joins the upper front stepped portion 58A and the upper rear stepped portion 58B that are provided at different positions in the front-rear direction, a long welding length can be secured in the front-rear direction and can be firmly joined. it can.

  As shown in FIG. 11, the upper edge of the outer intermediate frame member 48 is joined to the upper main frame member 41 by a welded portion 101 that continues along the lower edge of the upper main frame member 41. The lower edge of the outer intermediate frame member 48 is joined to the lower main frame member 42 by a welded portion 102 that continues along the upper edge of the lower main frame member 42.

15 is a cross-sectional view taken along the line XV-XV in FIG.
As shown in FIGS. 11 and 15, the front edge 48 </ b> A of the outer intermediate frame member 48 is in contact with the outer peripheral surface of the inner cylinder portion 71 of the head pipe 3 and extends continuously in the axial direction of the head pipe 3. To be joined to the inner cylinder portion 71.

As shown in FIG. 12, the upper edge of the inner intermediate frame member 49 is joined to the upper main frame member 41 by a welded portion 104 that continues along the inner lower edge of the upper main frame member 41. The lower edge of the inner intermediate frame member 49 is joined to the lower main frame member 42 by a welded portion 105 that is continuous along the inner upper edge of the lower main frame member 42.
As shown in FIGS. 12 and 15, the front edge 49 </ b> A of the inner intermediate frame member 49 is located on the outer peripheral surface of the rear portion of the inner cylinder portion 71 of the head pipe 3, and is welded by the welded portion 106 that extends in the axial direction of the head pipe 3. It is joined to the inner cylinder part 71.
As shown in FIG. 14, the inner cylinder portion 71 is formed in a long hole shape extending in the front-rear direction, and the upper inner cylinder joint portion 57 of the upper step portion 56 is welded to the outer side surface 71 </ b> A having a flat portion and extending in the front-rear direction. For this reason, the weld length can be increased and strong bonding can be achieved. In addition, since the inner cylinder portion 71 is a long hole, a plurality of bearing holders 77 having different bearing support positions are prepared, and the steering shaft 70 can be set within the inner cylinder portion 71 by changing the bearing holder 77 as desired. The position of the vehicle can be offset back and forth, and the vehicle geometry can be easily changed.

16 is a cross-sectional view taken along the line XVI-XVI in FIG. 17 is a cross-sectional view taken along XVII-XVII in FIG.
As shown in FIGS. 11, 12, 16, and 17, the lower main frame member 42 has a lower inner cylinder joint 63, a lower flange joint 64, and a lower outer peripheral surface contact at the tip of the lower step 62. The head has a closed cross section formed by the joint portion 65, and the closed cross section is formed continuously from the lower surface 71B of the head pipe 3, the lower flange portion 74B, and the outer surface 73A. It is joined to the pipe 3.

  Since the welded portion 107 is provided across the lower connecting portion 73 and the inner cylinder portion 71 and is also continuously welded to the lower flange portion 74B, the weld length of the head pipe lower joint portion 61 can be increased, and the welded portion is firmly joined. can do. Further, since the welded portion 107 joins the lower front side stepped portion 64A and the lower rear side stepped portion 64B provided at different positions in the front-rear direction, it is possible to ensure a long welding length in the front-rear direction and to join firmly. it can.

As shown in FIGS. 11 and 14 to 16, the outer cylinder member 75 having a circular cross section is disposed in the recess 3 </ b> A and covers the front part of the inner cylinder part 71. The outer cylinder member 75 is joined so that the outer circumferential surface 75D is continuous with the outer circumferential surface 72A of the upper coupling portion 72 and the outer circumferential surface 73A of the lower coupling portion 73, and the outer diameter of the front portion of the head pipe 3 is from the upper end. It is substantially the same up to the lower end.
The plate thickness of the outer cylinder member 75 is formed to be smaller than the depth of the recess 3 </ b> A of the head pipe 3, and a gap S is formed between the outer cylinder member 75 and the inner cylinder portion 71. Thus, since the front portion of the head pipe 3 has a double pipe structure having the gap portion S, the head pipe 3 can be configured to be lightweight, and the head pipe 3 can be reinforced and rigid by the outer cylinder member 75. Can be improved.

As shown in FIG. 11, the upper edge portion 75A of the outer cylindrical member 75 is joined to the upper connecting portion 72 by a welded portion 108 that is continuously provided on the outer diameter portion of the upper flange portion 74A. The lower edge portion 75B of the outer cylinder member 75 is joined to the lower connecting portion 73 by a welded portion 109 that is continuously provided on the outer diameter portion of the lower flange portion 74B.
The left and right side rear edges 75C of the outer cylinder member 75 are located outside the outer surface of the extension portion 56A of the upper main frame member 41, the outer surface of the outer intermediate frame member 48, and the extension portion 62A of the lower main frame member 42. It is joined to the outer surface of the left and right main frames 10 and 10 by the welded portion 110 that extends across the side surfaces. As described above, the outer cylinder member 75 has a closed cross-section with the welded portion straddling not only the head pipe 3 but also the upper main frame member 41, the outer intermediate frame member 48 and the lower main frame member 42 constituting the main frame 10. Therefore, the rigidity of the vehicle body frame 2 around the head pipe 3 can be effectively improved.
Further, the outer cylinder member 75 is set and welded to the concave portion 3 </ b> A at the front portion of the inner cylinder portion 71 after the head pipe body 74 and the main frames 10 and 10 are welded. For this reason, after finishing the welding part 100, the welding part 103, the welding part 107, etc., it can weld easily from the front side, and workability | operativity is good.

  As shown in FIGS. 12 and 13 to 17, the reinforcing plate portion 92 of the gusset member 51 is attached to the head pipe 3 by welding portions 111 </ b> A, 111 </ b> B, 111 </ b> C, and 111 </ b> D provided so as to be continuous vertically at the rear portion of the head pipe 3. Welded. The welded portions 111A, 111B, 111C, and 111D are alternately provided on the left and right of the reinforcing plate portion 92 in order from the bottom, and the end portions thereof are arranged so as to overlap the vertically adjacent welded portions.

  As described above, according to the embodiment to which the present invention is applied, the outer tube member 75 is provided in the inner tube portion 71 via the gap portion S, so that the head pipe 3 has a double tube structure, and the main frame. 10 and 10 are welded to the inner tube portion 71 and the upper connecting portion 72, and the inner tube portion 71 and the lower connecting portion 73. Thereby, while reinforcing the head pipe 3 with the outer cylinder member 75, the welding length can be increased so as to straddle the inner cylinder part 71 and the upper connection part 72 and the inner cylinder part 71 and the lower connection part 73. Since the main frames 10 and 10 can be firmly welded to the head pipe 3, the rigidity of the body frame 2 around the head pipe 3 can be improved without increasing the size of the body frame 2 around the head pipe 3. Further, since the head pipe 3 has a double pipe structure, the weight can be reduced.

  Further, an outer cylinder member 75 is provided in front of the inner cylinder part 71 so that the head pipe 3 has a double pipe structure, and is welded to the upper main frame member 41 along the outer shapes of the upper connecting part 72 and the inner cylinder part 71. The lower main frame member 42 is provided with a lower step portion 62 welded along the outer shape of the lower connecting portion 73 and the inner cylinder portion 71, and the main frames 10, 10 are The head pipe 3 is welded so as to straddle the upper connecting portion 72, the inner cylindrical portion 71, and the lower connecting portion 73. For this reason, the main frame 10, 10 can be firmly welded to the head pipe 3 via the upper step portion 56 and the lower step portion 62 while the front side is reinforced by the outer cylinder member 75, and the vehicle body frame around the head pipe 3. The rigidity around the head pipe 3 can be improved without increasing the size of the head 2.

  Further, the upper main frame member 41 and the lower main frame member 42 are formed of hollow members, the upper step portion 56 has an upper front step portion 58A and an upper rear step portion 58B, and the lower step portion 62 is a lower portion. Since it has a front stepped portion 64A and a lower rear stepped portion 64B, the upper main frame member 41 and the lower main frame member 42 are welded to the head pipe 3 at different positions in the front-rear direction. And the rigidity around the head pipe 3 can be further improved.

  Further, the side rear edge 75C of the outer cylinder member 75 is continuously welded to the side surfaces of the upper main frame member 41, the lower main frame member 42, and the outer intermediate frame member 48, so that the outer cylinder member 75 Since the welded portion 108, the welded portion 109, and the welded portion 110, which are welded portions between the head pipe 3 and the main frames 10, 10, can be closed, the rigidity around the head pipe 3 can be improved.

Further, the gusset member 51 provided between the left and right main frames 10 and 10 has a reinforcing plate portion 92 extending in the front-rear direction, and an upper reinforcing step portion 150 and a lower reinforcing step provided at the front portion of the reinforcing plate portion 92. Since the portion 160 is welded along the outer shapes of the upper connecting portion 72, the inner cylindrical portion 71 and the lower connecting portion 73 of the head pipe 3, the rigidity around the head pipe 3 can be improved.
Further, since the main frame 10 is composed of a plurality of members by joining the upper main frame member 41, the intermediate frame member 43, and the lower main frame member 42, the degree of freedom in adjusting the rigidity of the main frame 10 is increased. It can be improved. Further, since the volume in the lower main frame member 42 is increased by providing the extension portion 62A, the capacity when using the inner space of the lower main frame member 42 as a reservoir tank of the radiator 32 is easy. Can be secured.

Moreover, the said embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said embodiment.
In the above embodiment, the upper step 56 and the lower step 62 are provided on the upper and lower portions of the main frame 10 formed by welding the upper main frame member 41, the intermediate frame member 43, and the lower main frame member 42. However, the present invention is not limited to this, and an upper step and a lower step are provided at the upper and lower portions of the front portion of the main frame 10 constituted by a single member. Also good. In the above embodiment, the main frame 10 has the upper step portion 56 welded to the inner cylindrical portion 71 and the upper connecting portion 72, and the lower step portion 62 welded to the inner cylindrical portion 71 and the lower connecting portion 73. However, the present invention is not limited to this, and the main frame 10 is connected to at least one of the inner tube portion 71 and the upper connecting portion 72 or the inner tube portion 71 and the lower connecting portion 73. It only has to be welded. For example, only the upper step portion 56 may be provided without providing the lower step portion 62 on the main frame 10, and only the upper step portion 56 may be welded to the inner cylinder portion 71 and the upper connection portion 72. Of course, other detailed configurations of the saddle-ride type vehicle 1 can be arbitrarily changed.

1 saddle riding type vehicle 3 head pipe 10 main frame (main frame member)
32 Radiator 41 Upper main frame member 42 Lower main frame member 43 Intermediate frame member 51 Gusset member 56 Upper step 58A Upper front step 58B Upper rear step 62 Lower step 64A Lower front step 64B Lower rear step Part 70 Steering shaft 71 Inner cylinder part 72 Upper connection part 73 Lower connection part 75 Outer cylinder member 75C Side rear edge 92 Reinforcement plate part 150 Upper reinforcement step part 160 Lower reinforcement step part S Gap part

Claims (6)

An inner cylinder portion that surrounds the steering shaft, an upper connection portion that is connected to the upper end of the inner cylinder portion, and a lower connection portion that is connected to the lower end of the inner cylinder portion, and rotatably supports the steering shaft And a pair of left and right mains connected to the head pipe, the outer pipe member being welded to the upper connection part and the lower connection part In a body frame structure of a saddle-ride type vehicle provided with a frame member,
A vehicle body frame structure for a saddle-ride type vehicle, wherein the main frame member is welded to at least one of the inner cylinder part and the upper connecting part, or the inner cylinder part and the lower connecting part. The outer cylinder member is provided as a plate member having an arcuate cross section in front of the inner cylinder part, and is arranged along the outer shape of the upper connection part and the inner cylinder part at the upper part of the main frame member and the upper connection part. An upper step portion to be welded to the portion and the inner cylinder portion is provided,
The lower portion of the main frame member is provided with a lower step portion that is welded to the lower connecting portion and the inner cylinder portion along the outer shape of the lower connecting portion and the inner cylinder portion. The body frame structure of the saddle-ride type vehicle according to claim 1.   The main frame member is a hollow member having a closed cross-sectional structure, the upper stepped portion has an upper front stepped portion and an upper rear stepped portion having different positions in the front-rear direction, and the lower stepped portion is formed in the front-rear direction. The vehicle body frame structure for a saddle-ride type vehicle according to claim 1 or 2, further comprising a lower front side step portion and a lower rear side step portion which are different in position.   The body frame structure of a saddle-ride type vehicle according to any one of claims 1 to 3, wherein a side rear edge of the outer cylinder member is welded to a side surface of the main frame member. Between the pair of left and right main frame members, the head pipe and a gusset member for connecting the left and right main frame members are provided, and the gusset member has a reinforcing plate portion along the vehicle longitudinal direction,
At the front part of the reinforcing plate part, along the outer shape of the upper connecting part and the inner cylinder part, an upper reinforcing step part welded to the upper connecting part and the inner cylinder part, the lower connecting part and the The saddle riding type according to any one of claims 1 to 4, further comprising a lower reinforcing step portion welded to the lower connecting portion and the inner cylinder portion along the outer shape of the inner tube portion. Vehicle body frame structure.   The main frame member includes an upper main frame member, a lower main frame member provided below the upper main frame member, and an intermediate frame member connecting the upper main frame member and the lower main frame member. The vehicle body frame structure of a saddle-ride type vehicle according to any one of claims 1 to 5, wherein an inner space of the lower main frame member is configured as a reservoir tank of a radiator.

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