JP6838152B2 - vehicle - Google Patents

Description

The present invention relates to a vehicle comprising a head pipe that steerably supports a steering wheel, a main frame that extends downward from the head pipe, and a rear frame that is joined to the main frame and extends rearward.

Conventionally, it is disclosed in, for example, International Publication No. 2017/042884 that a rear frame is joined to a lower portion of a main frame (down frame) extending from a head pipe that steerably supports a steering wheel.

In a vehicle adopting such a frame structure, even if manufacturing variations of each frame occur, it is necessary to devise a method for manufacturing with a caster angle and a wheelbase predetermined by design. In this case, a frame structure that can suppress the influence of manufacturing variations while ensuring the rigidity of each frame is required.

Therefore, an object of the present invention is to provide a vehicle that can be manufactured with a desired caster angle and wheelbase while suppressing the influence of manufacturing variations of each frame.

The present invention is a vehicle including a head pipe that steerably supports a steering wheel, a main frame that extends downward from the head pipe, and a rear frame that is joined to the main frame and extends rearward, and has the following features. Have.

First feature: The main frame has a lower frame that extends outward in the vehicle width direction at the lower part of the main frame. The lower part of the frame has a main frame side joint surface to be joined to the rear frame. On the other hand, the rear frame includes a rear frame side joint portion joined to the main frame side joint surface, an inner member arranged inside the vehicle width direction, and an outer member arranged outside the vehicle width direction. And a protruding joint portion formed by joining the end portion of the inner member and the end portion of the outer member . In this case, the main frame side joint surface is formed so as to extend to the outside of the rear frame side joint portion in a state of being joined to the rear frame side joint portion. Further, both ends of the inner member and both ends of the outer member project in the vertical direction of the vehicle, so that the protruding joints are formed on the upper side and the lower side of the rear frame, respectively. Further, the vehicle is fitted on the upper side of the rear frame so as to cover the upper protruding joint portion and the outer member from above, and further includes a component support portion capable of supporting the vehicle body parts arranged in the vehicle. Be prepared.

Second feature; said rear frame, by a pre-Symbol inner member and said outer member are joined, is formed in a substantially hollow shape along the longitudinal direction of the vehicle. In this case, the rear frame side joint portion includes the front end portion of the inner member, and the front end portion is joined to the main frame side joint surface.

Third feature: The rear frame is formed in a substantially hollow shape along the front-rear direction by joining the inner member and the outer member, which are press-molded plate-shaped members. In this case, the front end portion of the inner member is joined to the mainframe side joint surface by surface contact.

Fourth feature: The protruding joint portion is inside the rear frame in the vehicle width direction, and has an end portion of the inner member projecting outward from a hollow portion of the rear frame and an end portion of the outer member. bonded to Ru is formed.

Fifth feature: The rear frame side joint portion and the protruding joint portion are formed so as to be continuous along the rear frame.

Sixth feature; the component supporting part is connected to the rear frame by connecting the protruding joint portion of the upper.

Seventh feature; the previous SL body components and the component supporting part are integrally fixed.

Eighth feature: The main frame side joint surface is formed on the outer side of the lower part of the frame in the vehicle width direction, and the rear frame approaches the main frame side joint surface from the rear to the front of the vehicle. As described above, the vehicle is formed so as to face inward in the vehicle width direction.

According to the first feature of the present invention, due to the manufacturing variation of the main frame and the rear frame, the joint position between the main frame side joint surface and the rear frame side joint portion is displaced. Also, the influence of the misalignment can be absorbed by the main frame side joint surface extending to the outside of the rear frame side joint portion. This makes it possible to manufacture a vehicle having a desired caster angle and wheelbase predetermined by design.

Further, since the mainframe-side joint surface is formed on the lower part of the frame that extends outward in the vehicle width direction, workability in the joint process is ensured while ensuring rigidity in the axial direction (torsion direction) of the handle. Can be improved.

According to the second feature of the present invention, the inner member and the outer member are joined to form the rear frame having a substantially hollow shape, and the front end portion of the inner member and the main frame side joint surface are joined. By doing so, the rear frame is joined to the lower part of the frame, so that the efficiency of the joining work can be improved.

According to the third feature of the present invention, since the front end portion of the inner member and the main frame side joint surface are joined by surface contact, rattling of the joint portion between the lower part of the frame and the rear frame is suppressed. , Manufacturability can be improved.

According to the fourth feature of the present invention, since the protruding joint portion is formed inside the rear frame in the vehicle width direction, the exterior cover is placed along the rear frame (the protruding joint portion). When attached to a vehicle, the exterior cover can be made to look compact. As a result, the appearance of the vehicle can be improved.

According to the fifth feature of the present invention, the joint portion between the main frame side joint surface and the rear frame side joint portion, and the end portion of the inner member and the end portion of the outer member at the protruding joint portion. Since it is possible to integrally show different joint points such as the joint points with the vehicle, it is possible to further improve the appearance of the vehicle.

According to the sixth feature of the present invention, the strength of the component support portion with respect to the vehicle body component can be ensured by connecting the component support portion and the upper protruding joint portion.

According to the seventh feature of the present invention, it is possible to easily realize high strength of the component support portion with respect to the vehicle body component.

According to the eighth feature of the present invention, the lower part of the main frame and the rear frame can form an integral curved surface, and the main frame and the rear frame are manufactured by press molding. It will be easier to do.

It is a left side view of the motorcycle which concerns on this embodiment. It is a perspective view of the vehicle body frame of FIG. It is a top view of the vehicle body frame of FIG. It is a partial front view of the vehicle body frame of FIG. It is a left side view of the vehicle body frame of FIG. FIG. 5 is a cross-sectional view taken along the line VI-VI of FIG. FIG. 5 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 5 is a cross-sectional view taken along the line VIII-VIII of FIG. It is sectional drawing along the IX-IX line of FIG. It is a perspective view of the rear part of the vehicle body frame of FIG. FIG. 5 is a cross-sectional view taken along the line XI-XI of FIG. It is sectional drawing along the XII-XII line of FIG.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[1. Outline configuration of motorcycle 10]
As an embodiment of the present invention, the scooter type motorcycle 10 shown in FIG. 1 will be described as an example. The present embodiment is not limited to the scooter type motorcycle 10, but can also be applied to other types of vehicles such as a turnip type and a motorcycle type saddle-mounted vehicle. Further, in the description of the present embodiment, the front-rear, left-right, and up-down directions will be described according to the directions seen from the driver (occupant) seated on the motorcycle 10. Further, in the following description, with respect to the pair of left and right components arranged in the vehicle width direction (horizontal direction) of the motorcycle 10, the left component is designated by an "L" following the reference number. On the other hand, for the component on the right side, a reference number may be followed by an "R" sign.

As shown in FIG. 1, the motorcycle 10 includes a front wheel 12 which is a steering wheel, a steering wheel 14 which steers the front wheel 12, a body frame 16 which constitutes a vehicle body, a unit swing engine 18 which is a drive source, and a rear wheel which is a drive wheel. It includes a wheel 20, a seat 22, and the like.

The front wheels 12 are provided in front of the vehicle body and are rotatably supported by a pair of left and right front forks 26L and 26R extending from the lower end side of the steering shaft 24. A front fender 28 that covers the upper part of the front wheel 12 is attached to the front forks 26L and 26R. A handle 14 is connected to the upper end side of the steering shaft 24, and a substantially intermediate portion thereof is rotatably held by the head pipe 30 of the vehicle body frame 16.

The steering wheel 14 extends symmetrically in the vehicle width direction about a connecting portion with the steering shaft 24. By operating the steering wheel 14, the driver changes the direction of the front wheels 12 connected via the steering shaft 24 and the front forks 26L and 26R.

The body frame 16 is made of a metal material such as aluminum, and has a head pipe 30, a main frame 32 connected to the head pipe 30 and extending downward, and a pair of left and right rear frames connected to the lower part of the main frame 32 and extending rearward. It is composed of 34L and 34R. The main frame 32 is a down frame extending downward and rearward from the head pipe 30. The rear frames 34L and 34R are connected to the left and right sides of the lower frame 36 as the lower part of the main frame 32, respectively, and are curved from the rear ends of the lower frames 38L and 38R extending rearward at the bottom of the vehicle body and the lower frames 38L and 38R. It is composed of seat rails 40L and 40R extending to the rear of the vehicle body.

The unit swing engine 18 is supported by a pair of left and right lower frames 38L and 38R so as to be able to swing up and down. Further, in the upper rear part of the vehicle body, a fuel tank 42 for supplying fuel (gasoline) to the unit swing engine 18 is supported by a pair of left and right seat rails 40L and 40R. Further, in the upper rear part of the vehicle body, in front of the fuel tank 42, a storage box 44 for accommodating articles is supported by a pair of left and right seat rails 40L and 40R.

Although not shown, the unit swing engine 18 includes an engine and a belt-type continuously variable transmission in which the output of the engine is continuously changed by a transmission belt and a movable pulley and transmitted to the rear wheels 20. The rear wheels 20 are rotatably supported by the unit swing engine 18, and rotate by transmitting rotational driving force from the continuously variable transmission to propel the vehicle body as drive wheels.

The unit swing engine 18 also functions as a swing arm. In this case, in the rear frame 34L on the left side, a suspension support portion 46, which is a frame separate from the seat rail 40L, is connected to the rear portion of the seat rail 40L. The suspension support portion 46 provided on the rear frame 34L supports the rear portion of the unit swing engine 18 via a rear cushion 48 as a suspension device. As will be described later, the suspension support portion 46 is provided only on the left rear frame 34L. Further, the rear portion of the suspension support portion 46 and the seat rail 40R of the rear frame 34R on the right side are connected via a bridge member 50 extending in the vehicle width direction.

The seat 22 is provided from a substantially intermediate portion in the front-rear direction of the vehicle body to the rear of the vehicle body. The seat 22 is a so-called tandem type seat composed of a front seat 22a in which the driver sits and a rear seat 22b in which the passenger sits behind the front seat 22a. In this case, the storage box 44 is provided below the front seat 22a, and the fuel tank 42 is provided below the rear seat 22b. Further, the seat 22 also functions as a lid for covering the upper surface of the storage box 44, and the internal space is exposed by pulling the seat 22 forward. Below the fuel tank 42 and the storage box 44, an air cleaner 52 that purifies the exhaust gas of the engine is arranged.

Below the unit swing engine 18, a rotatably supported main stand 54 is provided. The main stand 54 is erected so as to be substantially orthogonal to the road surface when parked, and the rear wheels 20 are floated to allow the motorcycle 10 to stand on its own.

Then, in the motorcycle 10, a vehicle body cover 56 that constitutes the appearance of the vehicle body and is made of resin or the like is attached to the vehicle body frame 16, the steering shaft 24, etc. in the front-rear direction of the vehicle body. The vehicle body cover 56 includes a front cover 58 that covers the front portion of the steering shaft 24 and the upper portion of the front wheels 12, a handle cover 60 that covers the steering wheel 14 above the front cover 58, and a driver's foot behind the front cover 58. A leg shield 62 that covers from the front, a floor center cover 66 that forms a step floor 64 behind the leg shield 62, and a body cover 68 that is arranged below the seat 22 and is connected to the floor center cover 66 and extends rearward. And.

Further, the steering wheel cover 60 covers the upper portion of the steering shaft 24 and the central portion of the steering wheel 14, and a meter device (not shown) for displaying the vehicle speed or the like is provided on the rear upper surface thereof. The front cover 58 is provided with a headlight portion 70.

The step floor 64 is formed flat so that the driver's foot can be placed on the step floor 64 during traveling. The body cover 68 extends upward and rearward from the floor center cover 66 and covers the fuel tank 42, the storage box 44, and the like. A rear fender 72, which covers the rear wheel 20 from the rear and arranges a license plate and the like, is attached to the lower portion of the rear side of the body cover 68. A tail lamp 74 is arranged behind the body cover 68. The tail lamp 74 turns on and off in response to the driver's braking operation.

[2. Structure of body frame 16]
Next, the structure of the vehicle body frame 16, which is a characteristic configuration of the motorcycle 10 according to the present embodiment, will be described with reference to FIGS. 2 to 12.

<2.1 Configuration of mainframe 32>
In the vehicle body frame 16, the front end portion of the main frame 32 is joined to the rear portion of the head pipe 30. In the present embodiment, "joining" is a concept including joining by various welding such as laser welding, joining by an adhesive, and the like. In the following description, joining by laser welding or arc welding will be described as an example.

The main frame 32 is configured by contacting the frame portions 32L and 32R, which have a substantially U-shaped cross section and have a half-split shape, in the middle, and joining both end portions of the contact. That is, a metal plate such as aluminum is press-molded into a half-split frame member having a substantially U-shaped cross section. Next, as shown in FIG. 7, the front and rear end portions of the left frame member (frame portion 32L) and the front and rear end portions of the right frame member (frame portion 32R) are brought into contact with each other in the middle and overlapped. match. Then, for example, laser welding is performed on the overlapping portions to join the left and right frame portions 32L and 32R to form a hollow main frame 32. Therefore, as shown in FIGS. 2 to 4, 6 and 7, the central portion of the main frame 32 in the vehicle width direction is the joint portion of the left and right frame portions 32L and 32R.

Further, the main frame 32 has a shape that expands outward in the left-right direction (vehicle width direction) downward from the head pipe 30, and the lower portion of the divergent portion is formed as the frame lower portion 36. As shown in FIGS. 2 to 7, the left and right side surfaces of the frame lower portion 36 are configured as joint surfaces (main frame side joint surfaces) 76L and 76R that are flat in the vertical direction. Holes 78L and 78R are formed on the joint surfaces 76L and 76R.

Then, the joint portions (rear frame side joint portions) 80L and 80R, which are the front ends of the lower frames 38L and 38R constituting the pair of left and right rear frames 34L and 34R, are joined to the left and right joint surfaces 76L and 76R, respectively. ing.

<2.2 Configuration of rear frames 34L and 34R>
Next, the configuration of the pair of left and right rear frames 34L and 34R will be described. Each of the rear frames 34L and 34R has inner members 82L and 82R arranged so as to stand up and down inside the vehicle width direction, and outer members 84L and 84R arranged outside in the vehicle width direction, respectively. ..

In this case, the inner members 82L and 82R are formed by forming a metal plate such as aluminum into a flat frame member by press molding. Further, the outer members 84L and 84R are formed by forming a metal plate such as aluminum into a frame member having a substantially U-shaped cross section by press molding. Then, the outer members 84L and 84R are brought closer to the inner members 82L and 82R from the outside in the vehicle width direction, and both ends (upper end and lower end) of the inner members 82L and 82R and both ends of the outer members 84L and 84R. Overlap the portions (upper end and lower end).

Next, laser welding (for example, spot laser welding at predetermined intervals) is performed on the overlapping portions along the front-rear direction of the motorcycle 10, so that the upper ends and the outer sides of the inner members 82L and 82R are formed. The upper ends of the members 84L and 84R are joined, and the lower ends of the inner members 82L and 82R and the lower ends of the outer members 84L and 84R are joined. As a result, the protruding joint portions 86L and 86R that project upward are formed by the joined upper end portions and the welded portions that join the upper end portions, respectively. On the other hand, the protruding joint portions 88L and 88R protruding downward are formed by the joined lower end portions and the welded portion for joining the lower end portions, respectively.

By joining the inner members 82L, 82R and the outer members 84L, 84R by the protruding joint portions 86L, 86R, 88L, 88R, a substantially hollow rear frames 34L, 34R are formed. Further, in the pair of left and right rear frames 34L and 34R in which the inner members 82L and 82R and the outer members 84L and 84R are integrally formed, the front frame portion becomes the lower frames 38L and 38R connected to the main frame 32. The rear frame portion is the seat rails 40L and 40R.

Regarding the inner members 82L and 82R and the outer members 84L and 84R, the plate thickness DLs of the inner member 82L and the outer member 84L on the left side are set to be thicker than the plate thickness DRs of the inner member 82R and the outer member 84R on the right side. (DL> DR).

As shown in FIGS. 3 and 7, the lower frames 38L and 38R are formed so as to approach the joint surfaces 76L and 76R inward in the vehicle width direction from the rear to the front of the motorcycle 10. There is. Specifically, the inner members 82L and 82R and the outer members 84L and 84R are curved inward in the vehicle width direction from the rear to the front of the motorcycle 10. The front ends of the inner members 82L and 82R are in surface contact with the joint surfaces 76L and 76R so as to cover the holes 78L and 78R. Further, the front end portions of the outer members 84L and 84R are curved inward in the vehicle width direction and are in contact with the front end portions of the inner members 82L and 82R.

As shown in FIGS. 2 to 5 and 7, the edge portion of the outer members 84L, 84R on the front end side connects the upper end and the lower end of the outer members 84L, 84R, and the inner members 82L, 82R. It is in contact with the front end of the. By performing laser welding on the portion where the edge portion on the front end portion side of the outer members 84L and 84R and the front end portion of the inner members 82L and 82R overlap, the front end portions and the outer member 84L of the inner members 82L and 82R are subjected to laser welding. , 84R is joined to the edge on the front end side. As a result, the joined front end portion and the edge portion and the welded portion for joining these portions form protruding joint portions 90L and 90R protruding outward from the lower frames 38L and 38R, respectively. By forming the protruding joints 90L and 90R, the hollow portions 92L and 92R formed in the rear frames 34L and 34R are closed in the front.

The joint portions 80L and 80R, which are the front end portions of the lower frames 38L and 38R, include the front end portions of the inner members 82L and 82R, the front end portions of the outer members 84L and 84R, and the protruding joint portions 90L and 90R. Further, the joint portions 80L and 80R (protruding joint portions 90L and 90R) and the protruding joint portions 86L, 86R, 88L and 88R are connected along the rear frames 34L and 34R as shown in FIGS. 2 and 5. It is formed like this.

Then, laser welding is performed on the overlapping portions in a state where the front end portions of the flat inner members 82L and 82R are in surface contact with the joint surfaces 76L and 76R so as to close the holes 78L and 78R. As a result, the joint portions 80L and 80R and the joint surfaces 76L and 76R are joined.

In this case, as shown in FIGS. 2 to 6, with the joint surfaces 76L and 76R and the joint portions 80L and 80R joined, the joint surfaces 76L and 76R extend to the outside of the joint portions 80L and 80R. That is, the joint surfaces 76L and 76R are formed so that the joint surfaces 76L and 76R protrude from the joint portions 80L and 80R (so that the joint portions 80L and 80R fit within the region of the joint surfaces 76L and 76R). ..

Further, as shown in FIGS. 3 and 7, in a plan view, the pair of left and right lower frames 38L and 38R are joined to the lower frame 36 so as to wrap around from the outside to the inside in the vehicle width direction. Therefore, the lower frame 36 and the lower frames 38L and 38R form a substantially integral curved surface.

<2.3 Rear frame 34L, 34R peripheral configuration>
The pair of left and right rear frames 34L and 34R are further provided with the following components.

The pair of left and right lower frames 38L and 38R are connected via a bridge member 94 extending in the left-right direction. Further, as shown in FIGS. 2, 3, 5, and 8, on the seat rails 40L and 40R sides of the lower frames 38L and 38R, component support portions 96L and 96R having a substantially U-shaped cross section are on the upper side. It is fitted on the upper side of the lower frames 38L and 38R so as to cover the protruding joint portions 86L and 86R, the inner members 82L and 82R and the outer members 84L and 84R from above.

The pair of left and right component support portions 96L and 96R are connected via a bridge member 98 extending in the left-right direction. The front portion of the storage box 44 as a body component of the motorcycle 10 is connected and fixed to the central portion of the bridge member 98. As a result, the storage box 44 and the component support portions 96L and 96R are integrally fixed via the bridge member 98, and the storage box 44 is connected to the lower frame via the bridge member 98 and the component support portions 96L and 96R. It is supported by 38L and 38R.

Further, a pair of left and right steps 100L and 100R on which a passenger (occupant) seated on the rear seat 22b rests his / her feet are connected to the lower frames 38L and 38R of the pair of left and right seat rails 40L and 40R, respectively.

Furthermore, as shown in FIGS. 2, 3, 5, 9 and 10, on the bridge member 50 side of each of the seat rails 40L and 40R, component support portions 102L and 102R having a substantially U-shaped cross section are provided. It is fitted on the upper side of the seat rails 40L and 40R so as to cover the upper protruding joint portions 86L and 86R, the inner members 82L and 82R and the outer members 84L and 84R from above. In this case, the pair of left and right component support portions 102L and 102R, the left and right sides of the upper housing 42a and the lower housing 42b constituting the fuel tank 42 as the vehicle body parts, and the left and right sides of the storage box 44 are screwed. By tightening together with 104L and 104R, the fuel tank 42, the storage box 44, and the component support portions 102L and 102R are integrally connected and fixed. As a result, the fuel tank 42 and the storage box 44 are supported by the seat rails 40L and 40R via the component support portions 102L and 102R.

<2.4 Configuration of suspension support portion 46 and bridge member 50>
The suspension support portion 46 is a member that is connected to the rear end portion of the seat rail 40L and is separate from the seat rail 40L. As shown in FIGS. 2, 3, 5, and 10 to 12, the suspension support portion 46 is arranged so as to stand vertically inside the vehicle width direction, like the rear frame 34L. It has a member 106 and an outer member 108 arranged on the outer side in the vehicle width direction.

In this case, the inner member 106 is formed by molding a metal plate such as aluminum into a flat plate-shaped frame member by press molding, while the metal plate such as aluminum is press-molded into a frame member having a substantially U-shaped cross section. The outer member 108 is formed by molding into. Then, the outer member 108 is brought close to the inner member 106 from the outer side in the vehicle width direction, and the upper end portion and the lower end portion of the inner member 106 and the upper end portion and the lower end portion of the outer member 108 are overlapped with each other. By performing arc welding or the like along the front-rear direction on the overlapping portions, the upper end portion of the inner member 106 and the upper end portion of the outer member 108 are joined, and the lower end portion of the inner member 106 and the outer member are joined. The lower end of 108 is joined. As a result, the joint portion (support portion side joint portion) 110 that protrudes upward is formed by the joined upper end portions and the welded portion that joins each upper end portion. On the other hand, a joint portion (support portion side joint portion) 112 that protrudes downward is formed by the joined lower end portions and the welded portion that joins each lower end portion. The protruding joint portions 110 and 112 are configured to include a bead (not shown) formed by arc welding or the like, and each end of the inner member 106 and each end of the outer member 108 are joined by the bead. ..

By joining the inner member 106 and the outer member 108 by such joint portions 110 and 112, a hollow suspension support portion 46 is formed, and the suspension support portion 46 is hollow so as to communicate with the hollow portion 92L. Part 114 is formed. As shown in FIG. 11, the suspension support portion 46 is connected to the rear frame 34L so that the inner member 106 and the outer member 108 fit into the opening portion at the rear end of the rear frame 34L.

The suspension support portion 46 extends so as to bend (direct) inward in the vehicle width direction toward the rear of the motorcycle 10. On the other hand, the seat rail 40R on the right side extends to the rear of the motorcycle 10 so as to face the suspension support portion 46, and is curved inward in the vehicle width direction toward the rear of the motorcycle 10. Therefore, the total length of the right seat rail 40R along the front-rear direction is longer than the total length of the left seat rail 40L along the front-rear direction. Further, the rear end portion of the suspension support portion 46 and the rear end portion of the seat rail 40R on the right side are connected via a bridge member 50 made of a metal material such as aluminum.

Regarding the inner member 106 and the outer member 108, each plate thickness DS of the inner member 106 and the outer member 108 is a plate of the inner members 82L, 82R and the outer members 84L, 84R constituting a pair of left and right rear frames 34L, 34R. Thickness It is set thicker than DL and DR. That is, each plate thickness DL, DR, and DS has a relationship of DS> DL> DR.

Further, the vertical protrusion length LS from the suspension support portion 46 of the joint portions 110 and 112 is the protrusion length outward (vertical direction or front-rear direction) from the rear frame 34L of the left protruding joint portions 86L, 88L and 90L. It is set shorter than the LL and the outward protrusion length LR from the rear frame 34R of the right protruding joints 86R, 88R, 90R (LS <LL = LR). Therefore, in the side view of FIG. 5, the protruding joint portion 86R on the right side protrudes upward from the joint portion 110, while the protruding joint portion 88R on the right side protrudes downward from the joint portion 112.

A rod-shaped cushion support member 116 that penetrates the inner member 106 and the outer member 108 in the vehicle width direction is connected and fixed to the suspension support portion 46, and the upper end portion of the rear cushion 48 is connected to the inner portion of the cushion support member 116. Is supported.

[3. Effect of this embodiment]
As described above, according to the motorcycle 10 according to the present embodiment, the following effects can be obtained.

Due to manufacturing variations of the main frame 32 and the rear frames 34L and 34R, the joint positions of the joint surfaces 76L and 76R on the main frame 32 side and the joint portions 80L and 80R on the rear frames 34L and 34R sides are displaced. Even so, the influence of the misalignment can be absorbed by the joint surfaces 76L and 76R extending to the outside of the joint portions 80L and 80R. This makes it possible to manufacture a motorcycle 10 having a desired caster angle and wheelbase predetermined by design.

Further, since the joint surfaces 76L and 76R are formed on the frame lower portion 36 extending outward in the vehicle width direction, the workability in the joining process is improved while ensuring the rigidity of the handle 14 in the axial direction (twisting direction). Can be made to.

Further, the inner members 82L and 82R and the outer members 84L and 84R are joined to form substantially hollow rear frames 34L and 34R, and the front ends of the inner members 82L and 82R and the joint surfaces 76L and 76R are joined. As a result, the rear frames 34L and 34R are joined to the lower frame 36, so that the efficiency of the joining work can be improved.

In this case, since the front ends of the inner members 82L and 82R and the joint surfaces 76L and 76R are joined by surface contact, rattling of the joint portion between the lower frame 36 and the rear frames 34L and 34R is suppressed, and the manufacturability is improved. Can be planned.

Furthermore, the protruding joint portion 86L is formed by joining the ends (upper end, lower end, front end) of the inner members 82L and 82R and the ends (upper end, lower end, front end) of the outer members 84L and 84R. , 86R, 88L, 88R, 90L, 90R are formed. As a result, when the body cover 56, which is an exterior cover, is attached to the motorcycle 10 while following the rear frames 34L, 34R (protruding joints 86L, 86R, 88L, 88R, 90L, 90R), the body cover 56 becomes compact. Can be shown to. That is, since the protruding joints 86L, 86R, 88L, 88R, 90L, 90R are formed inside the rear frame 34L, 34R in the vehicle width direction, the vehicle body is formed as compared with the case where it is formed outside in the vehicle width direction. It is possible to avoid increasing the size of the cover 56. As a result, the appearance of the motorcycle 10 can be improved.

Further, the joint portions 80L and 80R and the protruding joint portions 86L, 86R, 88L and 88R are formed so as to be continuous along the rear frames 34L and 34R. As a result, the joints between the joint surfaces 76L and 76R and the joints 80L and 80R, and the ends and outer members 84L of the inner members 82L and 82R at the protruding joints 86L, 86R, 88L, 88R, 90L and 90R, It is possible to integrally show different joints such as the joint with the end of 84R. As a result, the appearance of the motorcycle 10 can be further improved.

Further, by connecting the component support portions 96L, 96R, 102L, 102R and the upper protruding joint portions 86L, 86R, the component support portions 96L, 96R, 102L, 102R with respect to the fuel tank 42 and the storage box 44 as vehicle body parts. Strength can be ensured.

Furthermore, by integrally fixing the component support portions 96L, 96R, 102L, 102R and the fuel tank 42 and the storage box 44, the component support portions 96L, 96R, 102L, 102R with respect to the fuel tank 42 and the storage box 44 are integrally fixed. It is possible to easily realize high strength.

Further, since the rear frames 34L and 34R are curved so as to face the joint surfaces 76L and 76R from the rear to the front of the motorcycle 10, the lower frame 36 and the rear frames 34L and 34R are integrated. It is possible to form a curved surface. As a result, the main frame 32 and the rear frames 34L and 34R can be easily manufactured by press molding.

Further, according to the motorcycle 10 according to the present embodiment, the following effects can also be obtained.

Since the protruding joints 86L, 86R, 88L, 88R, 90L, and 90R are not formed on the suspension support portion 46, if the rear cushion 48 is supported by the suspension support portion 46, the rear cushion 48 is passed through the suspension support portion 46. Even if a force is applied to the left rear frame 34L, the rear frame 34L can be made less likely to be distorted. As a result, the weight of the rear frames 34L and 34R can be reduced while ensuring the strength of the rear frames 34L and 34R. Further, the wheelbase of the motorcycle 10 can be adjusted by appropriately changing the components of the suspension support portion 46.

Further, since the protruding length LS of the joint portions 110 and 112 is shorter than the protruding lengths LL and LR of the protruding joint portions 86L, 86R, 88L, 88R, 90L and 90R (LS <LL = LR), the left side from the rear cushion 48 It is possible to suppress the distortion of the rear frame 34L due to the force transmitted to the rear frame 34L. That is, the occurrence of distortion is suppressed by shortening the protruding length with respect to the portion where the force from the rear cushion 48 is likely to be applied. As a result, the weight of the rear frames 34L and 34R can be reduced while ensuring the strength of the rear frames 34L and 34R.

Further, when the suspension support portion 46 is formed along the front-rear direction, the protruding length LS of the joint portions 110 and 112 is set from the protruding lengths LL and LR of the protruding joint portions 86L, 86R, 88L, 88R, 90L and 90R. Can be shortened, so that the distortion of the rear frame 34L on the left side can be effectively suppressed.

Furthermore, since the plate thickness DL and DR of the rear frames 34L and 34R are thinner than the plate thickness DS of the suspension support portion 46 (DS> DL, DS> DR), sufficient strength is provided against the force from the rear cushion 48. While securing the weight, the weight of the entire motorcycle 10 can be reduced.

Moreover, by making the plate thickness DR of the rear frame 34R on the right side thinner than the plate thickness DL of the rear frame 34L on the left side (DL> DR), the weight of the entire motorcycle 10 can be further reduced. That is, in the present embodiment, the plate thickness is thickened as the force from the rear cushion 48 is easily applied (DS> DL> DR), so that the occurrence of distortion is suppressed and the weight of the motorcycle 10 is reduced. Can also be realized.

Further, by connecting the suspension support portion 46 and the rear frame 34R on the right side with the bridge member 50, the force transmitted from the rear frame 34R via the bridge member 50 can be received by the suspension support portion 46.

Further, since the suspension support portion 46 is directed inward in the vehicle width direction toward the rear of the motorcycle 10, the total length of the bridge member 50 along the vehicle width direction is shortened, and the rigidity of the motorcycle 10 can be increased. ..

[4. Modification example of this embodiment]
In the motorcycle 10 according to the present embodiment, the motorcycle 10 having the unit swing engine 18 has been described, but the present embodiment can also be applied to the motorcycle 10 having a power train at a position different from the above description. Of course. For example, the present embodiment can be applied to a motorcycle in which a power train is arranged below the main frame.

Further, in the present embodiment, the case where the suspension support portion 46 is connected to the rear of the left rear frame 34L has been described, but when the suspension device such as the rear cushion 48 is provided on the right side of the vehicle such as the motorcycle 10. , The suspension support portion 46 may be connected to the rear of the rear frame 34R on the right side. Further, when suspension devices are provided on both the left and right sides of the vehicle, the suspension support portions 46 may be connected to the rear of the pair of left and right rear frames 34L and 34R, respectively.

Further, in the present embodiment, the case where the hollow suspension support portion 46 is formed by joining the inner member 106 and the outer member 108 has been described. In the present embodiment, the suspension support portion 46 may be connected to the rear end portion of the rear frame 34L, so that a hollow frame can be adopted as the suspension support portion 46. In this case, the joints 110 and 112 are unnecessary.

Further, in the present embodiment, the rear frame 34L and the suspension support portion 46 are separately configured, but these may be integrally configured. In this case, for one hollow frame, the protruding lengths LS of the joints 110 and 112 at the suspension support portion 46 are shorter than the protruding lengths LL of the protruding joints 86L, 88L and 90L at the rear frame 34L. Just do it. Further, the protruding joint portions 86L, 88L, 90L and the joint portions 110, 112 may also be formed by different joining methods (for example, laser welding and arc welding).

Although the present invention has been described above using suitable embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the claims that the form with such modifications or improvements may also be included in the technical scope of the invention. Further, the reference numerals in parentheses described in the claims are attached following the reference numerals in the accompanying drawings for the purpose of facilitating the understanding of the present invention, and the present invention is limited to the elements to which the reference numerals are given. It is not interpreted as being done.

Claims (8)

A head pipe (30) that steerably supports the steering wheel (14), a main frame (32) that extends downward from the head pipe (30), and a rear frame (32) that is joined to the main frame (32) and extends rearward. In the vehicle (10) equipped with 34L, 34R),
The main frame (32) has a frame lower portion (36) extending outward in the vehicle width direction of the vehicle (10) at a lower portion of the main frame (32).
The lower frame (36) has a main frame side joint surface (76L, 76R) joined to the rear frame (34L, 34R).
The rear frame (34L, 34R) includes a rear frame side joint portion (80L, 80R) joined to the main frame side joint surface (76L, 76R) and an inner member (80L, 80R) arranged inside in the vehicle width direction. 82L, 82R), the outer member (84L, 84R) arranged on the outer side in the vehicle width direction, the end of the inner member (82L, 82R), and the end of the outer member (84L, 84R). It has a protruding joint portion (86L, 86R, 88L, 88R, 90L, 90R) formed by joining .
The main frame side joint surface (76L, 76R) extends to the outside of the rear frame side joint portion (80L, 80R) in a state of being joined to the rear frame side joint portion (80L, 80R). Formed ,
By projecting both ends of the inner member (82L, 82R) and both ends of the outer member (84L, 84R) in the vertical direction of the vehicle (10), the protruding joints (86L, 86R, 88L, 88R) are formed on the upper side and the lower side of the rear frame (34L, 34R), respectively.
The vehicle (10) is fitted on the upper side of the rear frame (34L, 34R) so as to cover the upper protruding joint portion (86L, 86R) and the outer member (84L, 84R) from above, and the vehicle. supportable part support part disposed (10) a body part (42, 44) the vehicle (10), wherein (96L, 96R, 102L, 102R ) further comprises Rukoto a. In the vehicle (10) according to claim 1.
The rear frame (34L, 34R), the front Symbol inner member (82L, 82R) and said outer member (84L, 84R) by the are joined, a substantially hollow shape along the longitudinal direction of the vehicle (10) Formed in
The rear frame side joint portion (80L, 80R) includes a front end portion of the inner member (82L, 82R), and the front end portion is joined to the main frame side joint surface (76L, 76R). Vehicle (10). In the vehicle (10) according to claim 2.
The rear frame (34L, 34R) is substantially hollow along the front-rear direction by joining the inner member (82L, 82R) and the outer member (84L, 84R), which are press-molded plate-shaped members. Formed into a shape
The vehicle (10), wherein the front end portion of the inner member (82L, 82R) is joined to the mainframe side joint surface (76L, 76R) by surface contact. In the vehicle (10) according to claim 2 or 3.
The protruding joints (86L, 86R, 88L, 88R, 90L, 90R) are inside the rear frame (34L, 34R) in the vehicle width direction, and are hollow portions (92L, 34R) of the rear frame (34L, 34R). the inner member projecting outwardly from 92R) (82L, 82R) wherein the end portion outer member (84L, the vehicle (10, wherein the benzalkonium formed by joining an end portion of the 84R) of). In the vehicle (10) according to claim 4.
The rear frame side joints (80L, 80R) and the protruding joints (86L, 86R, 88L, 88R, 90L, 90R) are formed so as to be continuous along the rear frame (34L, 34R). (10). In the vehicle (10) according to claim 4 or 5.
Said component support part (96L, 96R, 102L, 102R ) , the upper protruding joint portions (86L, 86R, 88L, 88 R) the rear frame by connecting the (34L, 34R) to be connected to the Characteristic vehicle (10). In the vehicle (10) according to claim 6 .
Before SL said component supporting part and the body part (42, 44) (96L, 96R, 102L, 102R) and the vehicle (10), characterized in that it is integrally fixed. In the vehicle (10) according to any one of claims 1 to 7.
The main frame side joint surfaces (76L, 76R) are formed on the outer side of the lower frame (36) in the vehicle width direction.
The rear frame (34L, 34R) is formed so as to approach the mainframe side joint surface (76L, 76R) from the rear to the front of the vehicle (10) toward the inside in the vehicle width direction. A vehicle (10) characterized by being

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