JP6946465B2 - Body frame structure of saddle-riding vehicle - Google Patents

Description

The present invention relates to a vehicle body frame structure.
This application claims priority based on Japanese Patent Application No. 2017-236481 filed on December 8, 2017, the contents of which are incorporated herein by reference.

Conventionally, adhesives are often used as a method for binding a fiber reinforced resin to a metal or the like, and many improvements in their physical properties have been proposed (see, for example, Patent Document 1).

Special Table 2016-510270A

However, since it is inevitable that the adhesive strength of the adhesive will decrease due to deterioration over time, it is required to use mechanical coupling together when bonding members used under severe environmental conditions such as weather, so simpler bonding is required. A method is required.

An object of the present invention is to suppress aging deterioration in a vehicle body frame structure using a fiber reinforced resin, and to firmly bond the fiber reinforced resin to a metal or the like.

(1) The vehicle body frame structure of one aspect according to the present invention forms a frame portion forming the skeleton of the vehicle, and forms the frame portion together with the metal material constituent portion made of a metal material and the metal material constituent portion. A resin material component made of a fiber-reinforced resin material, and the resin material component are bonded to the metal material component with elastic deformation.
(2) In the embodiment of (1) above, the metal material component may have an open cross section having an opening, and the resin material component closes the opening of the metal material component. It may be provided in.
(3) In the aspect of (1) or (2) above, at least one of the metal material component and the resin material component may be provided with a holding portion for fitting and holding the other.
(4) In the aspect of (3) above, the holding portion provided in the metal material constituent portion may be held so as to cover the end portion of the resin material constituent portion.
(5) In any one aspect of (1) to (4) above, the frame portion may include a curved portion that is curved outward in the vehicle width direction in a plan view, and the resin may be provided. The material component may be provided along the curved shape inside the curved portion in the vehicle width direction.
(6) In any one aspect of (1) to (5) above, the metal material component may form the outer side of the frame portion in the vehicle width direction, and the vehicle may be formed more than the resin material component. It may be arranged outside in the width direction.
(7) In the aspect of (6) above, the metal material component may be provided at the maximum width portion in the vehicle width direction of the vehicle body frame of the vehicle including the frame portion.
(8) In the embodiment of any one of (1) to (7) above, fiber threads of reinforcing fibers may be arranged in the resin material constituent portion along the longitudinal direction of the frame portion.

According to the aspect (1) above, at least a part of the frame portion forming the skeleton of the vehicle is formed of a fiber reinforced resin material instead of the metal material, so that the weight of the vehicle body frame can be reduced. Further, since the resin material component can be fitted to the metal material component in an elastically deformed state, mechanical bonding of both components can be performed more easily than when a fastening member such as a bolt is used. be able to. That is, since both components can be mechanically bonded by a simple operation, the bonding force due to aged deterioration of the adhesive is stronger than that in the case of bonding the metal material component and the resin material component only by bonding. The decrease can be suppressed without increasing the cost of the fastening member, and the frame portion made of different materials can be reliably integrated with a high bonding force.
According to the aspect (2) above, the frame portion having a hollow closed cross section is formed by closing the opening of the metal material constituent portion having an open cross section with the resin material constituent portion, so that the strength of the frame portion and the strength of the frame portion are increased. Weight can be reduced while ensuring rigidity. Further, since the hollow closed cross section is composed of a plurality of divided members, nesting is not required in the manufacturing process of the vehicle body frame, and the manufacturing of the vehicle body frame can be facilitated.
According to the aspect (3) above, since the metal material component and the resin material component can be bonded in a state of being mechanically positioned with each other, the bonding force between the metal material component and the resin material component is increased, and different types of components are formed. The frame portion made of the material can be surely integrated.
According to the aspect (4) above, since the end portion of the resin material constituent portion is covered with the holding portion of the metal material constituent portion, it is possible to prevent the reinforcing fibers of the resin material constituent portion from being exposed or scattered.
According to the aspect (5) above, since the resin material constituent portion is arranged on the curved inner peripheral side of the curved portion, the inner peripheral side of the curved portion can be supported by the elastic force and the restoring force of the resin material constituent portion. ..
Therefore, when a pressing load is applied to the frame portion from the front or the rear, it is possible to prevent the frame portion from being deformed so as to further bend the curved portion.
According to the aspect (6) above, the metal material component forming the outer side of the frame portion in the vehicle width direction functions as a protective part for protecting the resin material component from the outer side in the vehicle width direction, so that the frame portion may fall, collide with the side, or the like. Disturbance from the outside in the vehicle width direction due to the vehicle width is unlikely to reach the resin material component, and damage to the resin material component can be suppressed.
According to the aspect (7) above, in the maximum width portion that is susceptible to disturbance from the outside in the vehicle width direction due to a fall, a side collision, etc., it is possible to suppress the direct disturbance from reaching the resin material component and damage the resin material component. Can be suppressed.
According to the aspect (8) above, the drag force against the tensile load along the longitudinal direction of the frame portion can be increased.

It is a left side view of the motorcycle in embodiment of this invention. It is a left side view of the body frame of the motorcycle. FIG. 2 is a view taken along the line III of FIG. 2 and is a plan view of the vehicle body frame. It is a perspective view of the said body frame. It is a perspective view which shows typically the frame main body part of the main frame in embodiment of this invention. It is a perspective view which shows typically the frame main body part of the main frame of the comparative example. It is sectional drawing of the said frame main body part. It is sectional drawing which shows the 1st modification of FIG. It is sectional drawing which shows the 2nd modification of FIG. It is sectional drawing which shows the 3rd modification of FIG. It is sectional drawing which shows the 4th modification of FIG. It is sectional drawing which shows the 5th modification of FIG. It is sectional drawing which shows the 6th modification of FIG. It is sectional drawing which shows the 7th modification of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Unless otherwise specified, the directions such as front, rear, left, and right in the following description are the same as the directions in the vehicle described below. Further, in the appropriate places in the figure used in the following description, an arrow FR indicating the front of the vehicle, an arrow LH indicating the left side of the vehicle, an arrow UP indicating the upper part of the vehicle, a line CL indicating the center of the left and right sides of the vehicle body, and the outside in the vehicle width direction (horizontal direction). The arrow OUT indicating the inside of the vehicle width direction and the arrow IN indicating the inside in the vehicle width direction are shown.

<Whole vehicle>
As shown in FIG. 1, the saddle-riding vehicle of the present embodiment is a motorcycle 1. The front wheels 2 of the motorcycle 1 are supported by the lower ends of a pair of left and right front forks 3. The upper parts of the left and right front forks 3 are supported by the head pipe 6 at the front end of the vehicle body frame 5 via the steering stem 4. The steering stem 4 includes a steering shaft that is rotatably inserted into the head pipe 6, and a top bridge 4a and a bottom bridge 4b that are rotatably attached to the upper and lower ends of the steering shaft, respectively. The upper parts of the left and right front forks 3 are supported on the left and right sides of the top bridge 4a and the bottom bridge 4b, respectively. A steering handle 4c is mounted on the top bridge 4a.

The vehicle body frame 5 includes a head pipe 6 located at the front end portion, a pair of left and right main frames 7 extending downward and rearward from the head pipe 6, and a pair of left and right pivot frames 8 extending downward from the rear end portion of the main frame 7. It has. A seat frame 9 is connected to the rear portion of the main frame 7 and the pivot frame 8. The front end portion of the swing arm 11 is pivotally supported on the pivot frame 8 via a pivot shaft 8a along the vehicle width direction so as to be swingable. The rear wheel 12 of the motorcycle 1 is supported at the rear end of the swing arm 11. Behind the pivot frame 8, a step 8b on which the occupant puts his / her foot is arranged.

A rear cushion 13 is arranged in an upright posture in the vicinity of the front end portion of the swing arm 11. One end of the rear cushion 13 is connected to the swing arm 11, and the other end is connected to the vehicle body frame 5 via the link mechanism 14. An upper cross member 15 is erected between the upper ends of the left and right pivot frames 8 (see FIG. 2). A lower cross member 16 is erected between the lower ends of the left and right pivot frames 8 (see FIG. 2). A link connecting portion 16a for connecting the link mechanism 14 is integrally formed at the intermediate portion of the lower cross member 16 in the vehicle width direction.

A fuel tank 18 is supported above the left and right main frames 7. A seat 19 on which an occupant sits is supported behind the fuel tank 18 and above the seat frame 9. Below the left and right main frames 7, the power unit PU, which is the prime mover of the motorcycle 1, is suspended. The power unit PU is linked to the rear wheel 12 via, for example, a chain type transmission mechanism 21. A side stand bracket 22 is attached to the lower end of the left pivot frame 8. The side stand bracket 22 supports a foldable side stand (not shown) that supports the vehicle body in an upright posture tilted to the left.

The front part of the vehicle body is covered with the front cowl 25, the side of the power unit PU is covered with the side cowl 26, and the periphery of the seat frame 9 is covered with the rear cowl 27. At the front end of the front cowl 25, a front end intake port 25a of an intake duct (not shown) extending to the air cleaner box 36 is opened.

<Power unit>
As shown in FIG. 1, the power unit PU integrally includes an engine (internal combustion engine) 31 located on the front side thereof and a transmission 31a located on the rear side thereof. The engine 31 is, for example, a parallel four-cylinder engine in which the rotation center axis C1 of the crankshaft 32 is aligned in the left-right direction (vehicle width direction). The engine 31 has a cylinder 34 standing diagonally forward and upward above the front portion of the crankcase 33. The rear part of the crankcase 33 is a transmission case for accommodating the transmission 31a.

An independent intake passage (including the throttle body) 35 is connected to the upper rear part of the cylinder 34 for each cylinder. Each intake passage 35 is connected to an air cleaner box 36 arranged above the cylinder 34. The air cleaner box 36 projects upward from the main frame 7 in a side view and enters the inside of the front portion of the fuel tank 18. For example, the air cleaner box 36 and the fuel tank 18 may be covered with an exterior cover. An independent exhaust pipe 37 is connected to the lower front portion of the cylinder 34 for each cylinder. Each exhaust pipe 37 is arranged below the power unit PU and appropriately assembled to form a single collecting pipe, for example, which is connected to the silencer 38. A radiator 39 used for cooling the engine 31 is arranged in front of the cylinder 34.

The cylinder 34 has a wide left-right width with respect to the front-rear width. The cylinder 34 is arranged between the left and right main frames 7. The left and right main frames 7 have a curved shape that is convex outward in the vehicle width direction so as to avoid the outer portion of the cylinder 34. The portion of the left and right main frames 7 located outside the cylinder 34 in the vehicle width direction maximizes the distance between the left and right main frames 7.

<Body frame>
As shown in FIG. 1, the vehicle body frame 5 is a so-called diamond frame type in which a frame member that supports the power unit PU from below is omitted.
As shown in FIGS. 2 to 4, the vehicle body frame 5 includes a head block 41 including a head pipe 6 and front portions of the left and right main frames 7, and a pair of left and right main frame bodies forming a front-rear intermediate region of the left and right main frames 7. It is divided into 42 and a pivot block 43 including the rear portion of the left and right main frames 7 and the left and right pivot frames 8.

The head block 41 includes a plan-view triangular gusset 41a extending over the front portion of the head pipe 6 and the left and right main frames 7. The pivot block 43 includes an upper cross member 15 and a lower cross member 16 that connect the upper and lower ends of the left and right pivot frames 8, respectively.
Each dividing element of the vehicle body frame 5 is bonded to each other by various bonding means such as welding of metal material constituent parts 61 described later, fastening with bolts or rivets, bonding with caulking or structural adhesive, and the like. It is integrated.

The head pipe 6 has a cylindrical shape that is inclined so that the upper portion is located rearward. Reference numeral H1 in the figure indicates a downwardly sloping plane that is substantially orthogonal to the central axis C2 of the head pipe 6 in a side view. The main frame 7 extends rearward and downward along the inclined plane H1 in a side view. The upper surface of the front portion of the main frame 7 is inclined so as to be separated downward from the inclined plane H1 toward the front side in a side view. The upper end of the head pipe 6 is located below the inclined plane H1 in a side view.

<Mainframe>
With reference to FIGS. 2 to 4, the main frame 7 has a head pipe in a top view (top view substantially orthogonal to the inclined plane H1 and arrow III in FIG. 2) when viewed from a direction along the axis C2 of the head pipe 6. It extends from 6 so as to branch diagonally rearward and outward in the vehicle width direction. The main frame 7 is curved so that the middle portion in the front-rear direction is convex outward in the vehicle width direction. The rear portion of the main frame 7 extends rearward and diagonally inward in the vehicle width direction, and then is curved so as to be substantially parallel to the vehicle front-rear direction. The rear end portion of the main frame 7 is arranged substantially parallel to the vehicle front-rear direction, and is connected to the upper end portion of the pivot frame 8. The curve K1 in FIG. 3 shows a curve that curves along the extending direction (longitudinal direction) of the main frame 7 on the inclined plane H1. The main frame 7 has a frame main body portion 7a extending over the head pipe 6 and the upper end portion of the pivot frame 8. FIG. 2 The middle chain line 7b shows the lower edge portion of the frame main body portion 7a.

For example, a tank mount 44 that supports the side surface of the fuel tank 18 is projected on the upper rear side of the main frame 7, and a first frame mount that supports the upper front end of the seat frame 9 behind the tank mount 44. The portion 45a is projected. A second frame mount portion 45b that supports the lower side of the front end portion of the seat frame 9 is projected from the rear side of the upper end portion of the pivot frame 8.

With reference to FIG. 3, the front-rear intermediate portion of the main frame 7 forms a convex curved portion 46 that is curved so as to bulge outward in the vehicle width direction in a plan view (top view). The convex curved portion 46 includes a maximum width portion 46a that maximizes the distance between the left and right main frames 7 and maximizes the left and right width of the vehicle body frame 5. A component placement space S1 for arranging the cylinder 34 of the engine 31 and the air cleaner box 36 is formed between the left and right convex curved portions 46. The left and right convex curved portions 46 are curved so as to embrace the cylinder 34 and the air cleaner box 36 inside in the vehicle width direction (so as to bypass the outside of the cylinder 34 and the air cleaner box 36 in the vehicle width direction).

The rear portion of the main frame 7 forms a concave curved portion 47 that is curved inward in the vehicle width direction in a plan view (top view). The concave curved portion 47 includes a minimum width portion 47a that minimizes the distance between the left and right main frames 7. The portion extending from the rear portion of the left and right main frame 7 to the left and right pivot frame 8 is also a throttle portion that narrows the left and right width of the vehicle body frame 5 behind the convex curved portion 46. By narrowing the left-right width of the vehicle body frame 5 behind the convex curved portion 46, it becomes easier for the driver seated on the seat 19 to place his / her feet, and the foot-holding property and the vehicle body holdability due to the knee grip are ensured.

The main frame 7 has a vertically long rectangular shape having a wide vertical width with respect to the horizontal width and a hollow cross-sectional shape (see FIG. 2). The vertical width of the front end portion of the main frame 7 is substantially the same as the axial length of the head pipe 6. On the lower side of the main frame 7 (below the frame main body 7a), an engine hanger 48 having an inverted triangular shape when viewed from the side extends downward. A front mount portion 48a for supporting the front end portion of the crankcase 33 or the cylinder 34 is provided at the lower end portion of the engine hanger 48. The main frame 7 is provided so as to widen the vertical width toward the rear side in the range from the head pipe 6 to the front mount portion 48a. A recess 48b is formed in the rear portion of the engine hanger 48 so as to be recessed upward and forward in a side view. The main frame 7 is provided so as to narrow the vertical width toward the rear side from the recess 48b to the rear end portion of the main frame body 42.

Front and rear openings 49a and 49b that penetrate the main frame body 42 in the vehicle width direction are formed in front of and behind the main frame body 42. The front and rear openings 49a and 49b cut out the inner and outer walls of the hollow main frame body 42, and have inner peripheral walls 49a and 49b-1 extending between the inner and outer walls. The inner peripheral walls 49a-1 and 49b-1 also function as cross members connecting the inner and outer walls. By forming such front and rear openings 49a and 49b in the main frame 7, the rigidity balance of the entire body frame 5 is optimized.

<Pivot frame>
With reference to FIGS. 2 to 4, the pivot frame 8 extends in the vertical direction having a front-rear width substantially the same as the vertical width of the rear portion of the main frame 7 in a side view. The pivot frame 8 is inclined and extends so as to be located on the front side toward the lower side in a side view. A pivot support portion 51 for inserting and supporting the pivot shaft 8a is provided offset to the front side in the upper and lower intermediate portions of the pivot frame 8. Behind the pivot support portion 51, a step mount portion 52 for attaching the step bracket 8c that supports the step 8b is provided. A chain arrangement space S2 through which the drive chain 21a of the chain type transmission mechanism 21 passes is formed in the corner portion 53 formed by the lower end portion of the left pivot frame 8 and the left end portion of the lower cross member 16.

The upper cross member 15 is erected between the middle portions of the front-rear width at the upper end portions of the left and right pivot frames 8. The upper cross member 15 has an inverted trapezoidal shape with a narrow lower side and a hollow cross-sectional shape. A rear upper mount portion 54a that supports the rear upper side of the crankcase 33 is provided in front of the upper cross member 15 at the upper end portion of the pivot frame 8.
The lower cross member 16 is erected between the rear sides of the front-rear width at the lower ends of the left and right pivot frames 8. The lower cross member 16 has an inverted pentagonal shape with a substantially horizontal upper end and a hollow cross-sectional shape. In front of the lower cross member 16 at the lower end of the pivot frame 8, a rear lower mount portion 54b that supports the rear lower side of the crankcase 33 is provided.
At the lower end of the left pivot frame 8, a stand mounting portion 55 for fastening the side stand bracket 22 is provided.

<Frame cross-sectional structure>
FIG. 5A schematically shows a frame main body portion 7a of the main frame 7 according to the embodiment of the present invention. FIG. 5B is a perspective view schematically showing a frame main body portion of the main frame of the comparative example.
As shown in FIG. 5A, in the vehicle body frame 5, at least one of the dividing elements (main frame body 42 in the present embodiment) is formed of, for example, a metal material component 61 made of an aluminum alloy as a raw material, and, for example, a carbon fiber reinforced resin. The resin material constituent unit 62 made of the above material is integrated.

The main frame 7 has a vertically long rectangular shape and a hollow cross-sectional shape, and has a U-shape including the upper and lower connecting walls (hereinafter referred to as upper and lower walls 64 and 65) in the drawing and the outer outer wall 63 in the vehicle width direction. The range is defined as, for example, a metal material component 61 having a U-shaped cross section made of an aluminum alloy as a raw material. In the main frame 7, the remaining range (the range including the inner side wall 66 inside in the vehicle width direction) of the cross-sectional shape is, for example, a flat plate-shaped resin material component 62 made of carbon fiber reinforced resin as a raw material.

The resin material component 62 is formed by laminating a plurality of carbon sheets. The resin material component 62 is arranged so that long carbon fibers (long fiber threads) are arranged along the longitudinal direction of the main frame 7. The resin material component 62 closes the opening 67 opened inward in the vehicle width direction in the cross-sectional shape of the metal material component 61, and forms a rectangular closed cross section together with the metal material component 61. For example, the resin material component 62 is provided inside the main frame body 42 in the vehicle width direction. The resin material component 62 is provided along the inside (inner peripheral side) in the vehicle width direction of the convex curved portion 46 including the maximum width portion 46a in the main frame 7. The resin material component 62 may be provided inside the engine hanger 48 in the vehicle width direction, which has a large protrusion outward in the vehicle width direction. The resin material component 62 may be provided over the inside of the head block 41 and the pivot block 43 in the vehicle width direction.

FIG. 5B shows a frame main body portion 7a of the main frame 7 made of only a metal material such as an aluminum alloy as a comparative example. In this comparative example, although it is easy to manufacture and the cost can be suppressed, the effect of weight reduction by replacing a part of the main frame 7 with the resin material component 62 cannot be obtained as compared with the present embodiment of FIG. 5A. On the other hand, for example, when the entire main frame 7 is composed of only a fiber reinforced resin material such as carbon fiber reinforced resin, the effect of weight reduction is high, but internal damage occurs in the main frame 7 due to an impact from the outside in the vehicle width direction or the like. If so, the damage is difficult to recognize from the outside.

In the present embodiment, the following effects can be obtained by forming the main frame 7 not from a single material but from a plurality of materials. That is, since at least a part of the main frame 7 is made of a fiber reinforced resin material instead of the metal material, the weight of the vehicle body frame 5 should be reduced as compared with the case where the main frame 7 is made entirely of the metal material. Can be done. Further, since the resin material component 62 has a high degree of freedom in shape, it is possible to increase the degree of freedom in setting the strength and rigidity, and in this respect as well, the weight of the vehicle body frame 5 can be reduced.

Further, as compared with the case where the main frame 7 is entirely made of the fiber reinforced resin material, the disturbance from the outside in the vehicle width direction does not directly reach the resin material component 62, and the resin layer is caused by an impact from the outside in the vehicle width direction. Is not easily damaged. That is, by using the metal material constituent unit 61 as a protective portion of the resin material constituent portion 62, it is possible to prevent the resin layer from being laminated and peeled off. Further, from the state of the metal material component 61 on the outer side in the vehicle width direction, it is easy to recognize that the main frame 7 has been damaged, and it is possible to recognize the possibility that the fiber reinforced resin material on the inner side in the vehicle width direction has been damaged. Can be done.

As a method of integrating the metal material component 61 and the resin material component 62, in the present embodiment, the resin material component 62 is formed at the inner ends of the upper and lower walls 64 and 65 of the metal material component 61 in the vehicle width direction. The upper and lower rail portions 68 for inserting the upper and lower end portions from the inside of the cross section are provided. The resin material component 62 has a vertical width and has a strip shape extending in the longitudinal direction of the main frame 7. The resin material component 62 has a vertical width larger than the distance between the upper and lower walls 64 and 65. The resin material component 62 can be elastically deformed in the vertical direction so as to reduce its own vertical width, and in a state of being elastically deformed so as to reduce the vertical width, the opening inside the metal material component 61 in the vehicle width direction. Enter into part 67. In this state, by eliminating at least a part of the elastic deformation of the resin material constituent portion 62, the upper and lower end portions of the resin material constituent portion 62 are inserted into the upper and lower rail portions 68, respectively. When the resin material constituent portion 62 is made of fiber reinforced resin, the upper and lower end portions of the resin material constituent portion 62 are inserted into the upper and lower rail portions 68, so that the upper and lower end portions are covered with the upper and lower rail portions 68. The end treatment for eliminating the exposure and swelling of the fiber ends of the resin can be omitted.

When the upper and lower end portions of the resin material constituent portion 62 are inserted into the upper and lower rail portions 68, the upper and lower end portions are elastically pressed into the upper and lower rail portions 68 by leaving the bending in the vertical direction.
As a result, the state in which the resin material component 62 is mechanically bonded to the metal material component 61 is maintained. That is, the upper and lower rail portions 68 are holding portions (positioning portions) that hold the resin material constituent portion 62 in a closed state (position) of the opening 67 of the metal material constituent portion 61. The upper and lower end portions of the resin material constituent portion 62 may be fixed to the upper and lower rail portions 68 in combination with a structural adhesive. In this case, since the resin material component 62 is arranged inside the main frame 7 in the vehicle width direction, the structural adhesive is less likely to be affected by sunlight, wind and rain, etc., and the binding force of the structural adhesive is reduced. It can be suppressed. The structural adhesive may be applied to the upper and lower rail portions 68 in advance before assembling the resin material constituent portion 62, or may be applied to the upper and lower rail portions 68 after assembling the resin material constituent portion 62. After inserting the upper and lower end portions into the upper and lower rail portions 68, the resin material constituent portion 62 returns to the state before the elastic deformation without leaving elastic deformation, and is fixed to the upper and lower rail portions 68 by using a structural adhesive. May be good.

As a method of manufacturing the main frame 7, in addition to a method of bending and assembling the resin material component 62 with respect to the metal material component 61 having the opening 67, the opening 67 of the metal material component 61 is widened. It is also conceivable to form a work, set the resin material component 62 in the opening 67 of the work, perform a process of narrowing the opening 67 of the work, and bend the resin material component 62 at the same time as this process. ..

In the examples of FIGS. 5A and 6, the resin material component 62 is curved inward in the vehicle width direction (outside the cross-sectional shape of the main frame 7) in a state of being assembled to the metal material component 61 due to its own bending. It has a shape. Hereinafter, a modified example of the present embodiment will be described, but the above-mentioned configurations will be designated by the same reference numerals and the description thereof will be omitted.

In the example of FIG. 7, the resin material component 62 has a curved shape that is convex to the outside in the vehicle width direction (inside the cross-sectional shape of the main frame 7) in a state of being assembled to the metal material component 61 due to its own bending. ing. The resin material component 62 may be configured to apply an urging force to the convex curved portion 46 of the main frame 7 so as to extend the curvature by the elastic force due to its own bending. That is, the resin material component 62 may be elastically deformed according to the plan view shape of the metal material component 61, and may be curved outward in the vehicle width direction in a plan view. When the front wheels 2 are braked or the rear wheels 12 are pushed upward while the motorcycle 1 is traveling, a pressing load is input to the main frame 7 from the front or the rear, and the convex curved portion 46 is moved in the vehicle width direction. An action of bulging outward (trying to further bend the convex curved portion 46) occurs. This action can be reduced by the urging force of the resin material component 62.

In the example of FIG. 8, the resin material component 62 has a U-shaped cross section including the upper and lower walls 64 and 65 and the inner side wall 66 inside in the vehicle width direction in the cross-sectional shape of the main frame 7, and the metal material component 61 has a cross section of U shape. , The flat plate shape including the outer wall 63 on the outer side in the vehicle width direction in the cross-sectional shape. The upper and lower rail portions 68 insert and hold the outer ends of the upper and lower walls 64 and 65 in the vehicle width direction from the inside in the vehicle width direction. The upper and lower walls 64 and 65 may be held by the upper and lower rail portions 68 in a state of being elastically deformed inside the cross section.

In the example of FIG. 9, the main frame 7 has a cross-sectional shape different from the above-mentioned cross-sectional shape (for example, a vertically long elliptical shape), and the cross-sectional shape is divided in the vehicle width direction (for example, half-divided). It is composed of a material component 61 and a resin material component 62. That is, the cross-sectional shape of the main frame 7 is not limited to a rectangular shape. The upper and lower rail portions 68 insert and hold the upper and lower end portions of the resin material component 62 facing outward in the vehicle width direction from the inside in the vehicle width direction. The upper and lower ends of the resin material component 62 may be held by the upper and lower rail portions 68 in a state of being elastically deformed inside the cross section.

In the example of FIG. 10, the metal material component 61 and the resin material component 62 have a U-shaped cross section in which the openings 67a and 67b face each other in the vehicle width direction, and the inside of the opening 67a of the metal material component 61. The resin material component 62 is inserted into the structure, and the upper walls 64a and 64b and the lower walls 65a and 65b are joined by the structural adhesive Z. The upper and lower walls 64b and 65b ends of the resin material component 62 may be joined to the upper and lower walls 64a and 65a of the metal material component 61 in a state of being elastically deformed inward in the cross section.

In the example of FIG. 11, the metal material constituent portion 61 has a U-shaped cross section and the resin material constituent portion 62 has a flat plate shape, and the upper and lower end portions thereof face each other in the vehicle width direction and are joined by the structural adhesive Z. There is. For example, upper and lower flanges 64c and 65c forming an adhesive surface are continuously provided at the tips of the upper and lower walls 64 and 65 of the metal material component 61. The upper and lower flanges 64c and 65c may stand inside the cross section (upper flange 64c) or outside the cross section (lower flange 65c).

In the example of FIG. 12, the resin material component 62 has a pipe shape including the closed cross-section structure 69, and the metal material component 61 has a flat plate shape and is arranged outside the closed cross section structure 69 in the vehicle width direction. .. Upper and lower walls 64b and 65b extend outward in the vehicle width direction from the upper and lower ends of the closed cross-section structure portion 69, and the outer ends of the upper and lower walls 64b and 65b in the vehicle width direction are the upper and lower rail portions 68 of the metal material component 61. It is inserted and held from the inside in the width direction of the vehicle.

In the example of FIG. 13, the resin material constituent portion 62 has a pipe shape including the closed cross-section structure portion 69, the metal material constituent portion 61 has a U-shaped cross section, and the upper and lower walls 64 and 65 of the metal material constituent portion 61 are closed. It is joined to the upper and lower ends of the cross-sectional structure portion 69 with a structural adhesive Z. The metal material component 61 may be in the shape of a pipe including a closed cross-sectional structure.

As described above, the vehicle body frame structure in the above embodiment forms the main frame 7 forming the skeleton of the vehicle, and forms the main frame 7 together with the metal material component 61 made of a metal material and the metal material component 61. A resin material constituent portion 62 made of a fiber-reinforced resin material, and the resin material constituent portion 62 are bonded to the metal material constituent portion 61 with elastic deformation.

According to this configuration, at least a part of the main frame 7 forming the skeleton of the vehicle is formed of a fiber reinforced resin material instead of the metal material, so that the weight of the vehicle body frame 5 can be reduced. Further, since the resin material component 62 can be fitted to the metal material component 61 in an elastically deformed state, the machines of both components 61 and 62 can be easily fitted as compared with the case where a fastening member such as a bolt is used. Target coupling can be carried out. That is, since both the constituent parts 61 and 62 can be mechanically bonded by a simple operation, the adhesive material is aged as compared with the case where the metal material constituent portion 61 and the resin material constituent portion 62 are bonded only by bonding. It is possible to suppress a decrease in the bonding force due to deterioration without increasing the cost of the fastening member, and it is possible to reliably integrate the main frame 7 made of different materials with a high bonding force.

Further, in the vehicle body frame structure, the metal material component 61 has an open cross section having an opening 67, and the resin material component 62 is provided so as to close the opening 67 of the metal material component 61. There is.
In this way, by closing the opening 67 of the metal material component 61 having an open cross section with the resin material component 62, the main frame 7 having a hollow closed cross section is formed, so that the strength and rigidity of the main frame 7 are formed. It is possible to reduce the weight while ensuring the above. Further, since the hollow closed cross section is composed of a plurality of divided members, nesting is not required in the manufacturing process of the vehicle body frame 5, and the manufacturing of the vehicle body frame 5 can be facilitated.

Further, in the vehicle body frame structure, at least one of the metal material constituent portion 61 and the resin material constituent portion 62 includes a rail portion 68 for fitting and holding the other.
As a result, the metal material component 61 and the resin material component 62 can be bonded in a state of being mechanically positioned with each other. Therefore, the bonding force of the metal material component 61 and the resin material component 62 is increased, and the materials are made of different materials. The main frame 7 can be reliably integrated.

Further, in the vehicle body frame structure, the rail portion 68 provided in the metal material constituent portion 61 is held so as to cover the end portion of the resin material constituent portion 62.
As a result, since the end portion of the resin material constituent portion 62 is covered with the rail portion 68 of the metal material constituent portion 61, it is possible to prevent the reinforcing fibers of the resin material constituent portion 62 from being exposed or scattered.

Further, in the vehicle body frame structure, the main frame 7 includes a convex curved portion 46 that is curved outward in the vehicle width direction in a plan view, and the resin material constituent portion 62 is a vehicle of the convex curved portion 46. It is provided along the curved shape inside in the width direction.
By arranging the resin material constituent portion 62 on the curved inner peripheral side of the convex curved portion 46 in this way, the inner peripheral side of the convex curved portion 46 is supported by the elastic force and the restoring force of the resin material constituent portion 62. be able to. Therefore, when a pressing load is applied to the main frame 7 from the front or the rear, it is possible to prevent the main frame 7 from being deformed so as to further bend the convex curved portion 46.

Further, in the vehicle body frame structure, the metal material component 61 forms the outer side of the main frame 7 in the vehicle width direction, and is arranged outside the resin material component 62 in the vehicle width direction.
As a result, the metal material component 61 forming the outer side of the main frame 7 in the vehicle width direction functions as a protective unit that protects the resin material component 62 from the outer side in the vehicle width direction. It is difficult for disturbance from the outside to reach the resin material component 62, and damage to the resin material component 62 can be suppressed.

Further, in the vehicle body frame structure, the metal material component 61 is provided in the maximum width portion 46a in the vehicle width direction of the vehicle body frame 5 including the main frame 7.
As a result, in the maximum width portion 46a, which is susceptible to disturbance from the outside in the vehicle width direction due to a fall, a side collision, or the like, it is possible to suppress the direct disturbance from reaching the resin material constituent portion 62 and suppress damage to the resin material constituent portion 62. can.

Further, in the vehicle body frame structure, fiber threads of reinforcing fibers are arranged in the resin material constituent portion 62 along the longitudinal direction of the main frame 7.
As a result, the drag force against the tensile load along the longitudinal direction of the main frame 7 can be increased.

The present invention is not limited to the above embodiment. For example, the resin material constituent portion 62 is not limited to carbon fiber reinforced resin (CFRP), but reinforced fibers other than carbon fibers such as glass fiber reinforced resin (GFRP). May be used.
The engine of the power unit of the applicable vehicle is not limited to the parallel four-cylinder engine, and the number of cylinders and the cylinder arrangement do not matter. Further, a longitudinal engine in which the axial direction of the crankshaft is directed in the front-rear direction may be used. Further, the power unit may include an electric motor as a drive source. At this time, a running battery may be mounted between the left and right main frames.
The saddle-riding type vehicle includes all vehicles that the driver rides across the vehicle body, and includes not only motorcycles (including motorized bicycles and scooter type vehicles) but also three wheels (one front wheel and two rear wheels). , Front two-wheeled and rear one-wheeled vehicles) or four-wheeled vehicles are also included.
The configuration in the above embodiment is an example of the present invention, and various modifications can be made without departing from the gist of the present invention, such as replacing the constituent elements of the embodiment with well-known constituent elements.

1 Motorcycle (saddle-riding vehicle)
5 Body frame 6 Head pipe 7 Main frame (frame part)
7a Frame body 8 Pivot frame 15 Upper cross member 16 Lower cross member 41 Head block 42 Main frame body 43 Pivot block 46 Convex curved part (curved part)
46a Maximum width 48 Engine hanger 61 Metal material component 62 Resin material component 63 Outer side wall 64 Upper wall 65 Lower wall 66 Inner side wall 67 Opening 68 Rail part (holding part)

Claims (7)

A frame portion (7) forming the skeleton of a saddle-riding vehicle is formed, and a metal material component portion (61) made of a metal material and a metal material component portion (61) are formed.
The frame portion (7) is formed together with the metal material constituent portion (61), and the resin material constituent portion (62) made of a fiber reinforced resin material is provided.
The resin material component (62) is bonded to the metal material component (61) with elastic deformation.
The metal material component (61) has an open cross section having an opening (67).
The resin material component (62) is provided so as to close the opening (67) of the metal material component (61).
Body frame structure of saddle-riding vehicle. The body frame of a saddle-riding vehicle according to claim 1, wherein at least one of the metal material component (61) and the resin material component (62) is provided with a holding portion (68) for fitting and holding the other. structure. The body frame of a saddle-riding vehicle according to claim 2, wherein the holding portion (68) provided in the metal material constituent portion (61) is held so as to cover the end portion of the resin material constituent portion (62). structure. The frame portion (7) includes a curved portion (46) that is curved outward in the vehicle width direction in a plan view.
The vehicle body of the saddle-riding vehicle according to any one of claims 1 to 3, wherein the resin material component (62) is provided along the curved shape inside the curved portion (46) in the vehicle width direction. Frame structure. The metal material component (61) forms the outer side of the frame part (7) in the vehicle width direction, and is arranged outside the resin material component (62) in the vehicle width direction. The body frame structure of the saddle-riding vehicle described in any one of the items. The metal material component (61) is provided at the maximum width portion (46a) in the vehicle width direction of the body frame (5) of the saddle-riding vehicle including the frame portion (7).
The body frame structure of the saddle-riding vehicle according to claim 5. The saddle-riding type according to any one of claims 1 to 6, wherein fiber threads of reinforcing fibers are arranged in the resin material constituent portion (62) along the longitudinal direction of the frame portion (7). Vehicle body frame structure.

Images