JPH10218064A - Body frame of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a part of a body frame easily and facilitate accessibility to reduce assembly man-hour of the body frame by molding a pair of right and left rear frame half bodies by using dies and connecting both rear frame half bodies mutually by using bolts to constitute a rear frame. SOLUTION: A body frame F1 of a motorcycle is provided with a front frame 111 , a rear frame 121 connected with a rear part thereof by using a bolt, and a rear fender 13 connected with a rear end of the rear frame 121 by using a bolt. A rear wheel is suspended from the rear frame 121 through a pair of right and left rear forks. In this case, the rear frame 121 is constituted by mutually connecting a pair of right and left rear frame half bodies 25, 25 which are cast and molded by using aluminum alloy, respectively, by using bolts, and a front part of the rear frame 121 is assembled at two sections which are apart in the longitudinal direction of a frame main body 221 in a rear part of the frame main body 221 in the front frame 111 by connecting them by using bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle body frame including a front frame having a head pipe at a front end and a rear frame formed in a box shape and connected to the front frame.

[0002]

2. Description of the Related Art A body frame is formed by welding and connecting a plurality of metal parts such as a front frame made of an iron pipe, a pair of press-formed left and right metal rear halves and a rear fender. And Japanese Patent Laid-Open No. 1-3119
No. 75, the entire body frame is formed by integral casting, and British Patent No. 12817.
As disclosed in the specification of JP-A-31-31, there has been conventionally known a structure in which a pair of left and right frame halves are combined with a bolt or the like to form a vehicle body frame.

[0003]

However, in the case where a plurality of metal parts are welded and joined to form a body frame, a large number of blanks, draws, homes, trims, pierces and the like are used in press forming of metal parts. In addition to the above steps, spot welding, MIG welding, TIG welding, etc. are also required for welding and joining, and the number of steps of attaching and detaching to and from the jig for each welding increases, and the assembly process of the body frame becomes longer. Become.

Further, in the case where the entire body frame is formed by integral casting (Japanese Patent Laid-Open No. 1-311975), the shape of the cast product becomes large, the mold structure becomes complicated, and casting becomes difficult. It's not easy to handle.

[0005] Further, in a vehicle body frame in which a pair of left and right frame halves are connected by bolts or the like (British Patent No. 1281731), a mold is divided as compared with the above-mentioned vehicle body frame integrated body. The structure becomes simple,
Although casting is relatively easy, the shape of the cast product is still large and the number of bolt connection points increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and enables at least a part of a vehicle body frame to be easily formed, facilitates routing, and reduces the number of assembly steps of the vehicle body frame. It is an object of the present invention to provide a motorcycle frame of a motorcycle.

[0007]

In order to achieve the above object, the present invention is directed to a front frame having a head pipe at a front end thereof, and a rear frame formed in a box shape and connected to the front frame. A left and right pair of rear frame halves are respectively formed by molding, and the rear frame halves are bolted to each other to form a rear frame. .

[0008] According to such a configuration, the pair of rear frame halves constituting the rear frame of the vehicle body frame are formed by molding, so that the number of molding steps is reduced as compared with the case of press molding, and the vehicle body frame is formed. Since both rear frame halves can be molded with a smaller mold than the mold over the entire length in the front-rear direction, molding is easier and easier to arrange. Need less.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the front frame is formed by the first bolt for fastening the pair of left and right rear frame halves to each other. The two rear frame halves are bolted by being connected to the frame and the rear end of the front frame, the pair of left and right rear frame halves and the pivot portion of the rear fork are interconnected by second bolts. The first and second bolts can be used to connect the front frame to the rear frame and to connect and support the rear fork to the body frame, thereby reducing the number of parts and the number of assembly steps. Can be achieved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 is a side view of a motorcycle, FIG. 2 is a side view showing an entire structure of a vehicle body frame, and FIG. FIG. 4 is an enlarged cross-sectional view taken along line 4-4 in FIG. 2 to show a combined state of a front frame, a rear fork, and a rear frame. FIG. 5 is a view showing storage of a fuel tank in the rear frame. FIG. 6 is an enlarged cross-sectional view taken along line 5-5 of FIG. 2 showing the state, and FIG. 6 is an enlarged cross-sectional view taken along line 6-6 of FIG.

First, referring to FIG. 1, the body of the motorcycle
Frame F₁Is the front frame 11 ₁And the front frame
11₁Frame 12 bolted to the rear of the₁
And the rear frame 12₁Rear bolted to rear end
And a fender 13.

[0013] the head pipe 23 ₁ is provided at the front end of the front frame 11 _1, the front fork 14 are supported to be steered, the front wheel W _F is rotatably supported to the lower end of the front fork 14, the steering wheel 15 which is arranged above is connected to the front fork 14 of the head pipe 23 _1.

[0014] The rear frame 12 _1, left, rear wheel W _R through the right pair of rear forks 16 ... are suspended,
Between the two rear fork 16 ... and the rear frames 12 ₁ rear cushion 17 ... are respectively provided. Also in the vehicle body frames F ₁ at the junction near the front frame 11 ₁ and the rear frame 12 _1, a power unit 18 including an engine and speed reducer mounted, is supported, the driving force to the rear wheel W _R from the power unit 18 Is transmitted.

[0015] Most of the front frame 11 ₁ is covered with synthetic resin cover 19 having a leg shield portion 19a. Sheet 20 to the rear frame 12 ₁ on the front
There is mounted as possible to be erected on the front side, the rear carrier 21 is mounted on the rear frame 12 ₁ in the rear side of the seat 21.

In FIG. 2 and FIG.
1 ₁ includes a frame main body 22 ₁ of the shaped metal pipe, a head pipe 23 ₁ which is coupled by welding or the like to the front end of the frame main body 22 _1, provided over between front and the head pipe 23 ₁ of the frame main body 22 ₁ Reinforcements 24
Consists of _one and _one .

4 to 6, a rear frame 1 is shown.
2₁Are each formed by casting with aluminum alloy etc.
The left and right pair of rear frame halves 25 and 26
And the front frame 11₁In
Frame body 22₁The rear part is the frame main body 22₁
Rear frame 12 at two locations spaced apart in the longitudinal direction of the ₁
Bolted to the front.

[0018] portion of the rear end of the frame main body 22 _1, the first boss 27 a cylindrical penetrating the frame main 22 ₁ is welded so as to project the both ends from both sides of the frame main body 22 ₁ . At both ends of the first boss 27,
When the inner surfaces of the front ends of the pair of left and right rear frame halves 25 and 26 are in contact with each other, the rear frame half 26, the first boss 27 and the left rear frame half from the right rear frame half 26 side. The first bolt 28 is inserted through the body 25, and the first bolt 28 protruding from the left rear frame half 25.
A nut 29 is screwed into the end of the nut. As a result, the front part of both rear frame halves 25, 26 are bolted one position of the rear of the front frame 11 ₁ is a rear frame 12 ₁ while being bolted to each other.

Further to the lower rear end of the frame main body 22 _1, a second boss 30 a cylindrical is welded so as to project the both ends from both sides of the frame main body 22 _1, a second
At both ends of the boss 30, support members 31, 31 having a ring shape coaxial with the second boss 30 are fixed. On the other hand, fitting cylindrical portions 25a, 26a for loosely fitting both ends of the second boss 30 are integrally formed on the inner surfaces of both rear frame halves 25, 26 at portions corresponding to the second boss 30. Both rear frame halves 25, 26 at portions corresponding to the second boss 30
On the outer surface, are formed cylindrical projections 25b and 26b which are coaxial with the fitting cylinders 25a and 26a.

[0020] The fitting tube portion 25a, 26a, upon assembly of the body frame F ₁ and the rear fork 16, 16, almost exactly the relative position between the front frame 11 ₁ and two rear frame halves 25 and 26 , Which facilitates the assembling work.

The portions near the front end of the pair of left and right rear forks 16, 16 are connected to each other via a connecting rod 32, and the pivot portions 1 at the front ends of the rear forks 16, 16 are connected to each other.
The cylindrical support cylinders 33, 33 are fixed to 6a, 16a,
The outer cylinder portions 34a, 34a of the rubber bushes 34, 34 are press-fitted into the support cylinders 33, 33. That is, the rubber bush 3
4 is an inner peripheral surface of the metal outer cylinder portion 34a and the outer cylinder portion 34a
An elastic portion 34c made of rubber is baked on the outer peripheral surface of a metal inner cylindrical portion 34b which is coaxial with the outer cylindrical portion 34b.

The two rear forks 16, 16 are
The inner cylindrical portion 34b of the rubber bush 34 of the front end of the 6, 16, 34b and projection 25b, is arranged so as to abut against the tip of 26b, one of the rubber from the right side along the longitudinal direction of the vehicle body frames F ₁ An inner cylindrical portion 34b of the bush 34,
The protrusion 26 b, the support member 31 at one end of the second boss 30 between the two rear frame halves 25, 26, the second boss 30, and the second
The second bolt 3 is attached to the support member 31 at the other end of the boss 30, the protrusion 25b, and the inner cylinder portion 34b of the other rubber bush 34.
5 is inserted, and a nut 36 is screwed into an end of a second bolt 35 protruding from the other rubber bush 34. Thus, results in the front of both rear frame halves 25, 26 are bolted rear end of the front frame 11 ₁ is a rear frame 12 ₁ while being bolted to each other,
Further, pivot portions 16a of both rear forks 16, 16 are provided.
16a is to be connected to the vehicle body frames F ₁ in the swingable.

A fastening bolt 37 is inserted between the first and second bolts 28, 35 from both the rear frame halves 25, 26 from the right rear frame half 26 side, and is connected to the left rear frame half. A nut 38 is screwed into an end of a fastening bolt 37 protruding from 25. Moreover, fastening bolt 3
Reference numeral 7 is inserted through hanger members 39, 40 sandwiched between the rear frame halves 25, 26. The hanger members 39, 40 support the engine of the power unit 18.

Paying particular attention to FIG. 5, bulging portions 25c and 26c bulging outward are provided above the front end portions of the rear frame halves 25 and 26, respectively.
A tank chamber 41 is formed between 5c and 26c,
An opening 42 at the upper end of the tank chamber 41 is formed, and a fuel tank 43 having an upper end facing the opening 42 is provided in the tank chamber 41.
Is stored in. Moreover, the opening 42 is formed to have a width smaller than the maximum width of the tank chamber 41, and the opening 42 is closed by the sheet 20 shown in FIG.

Incidentally, both rear frame halves 25, 26
Are bolted to each other to form a tank chamber 41 having a width larger than the width of the opening 42, and to increase the capacity by increasing the width below the upper end to increase the capacity. The tank 43 can be stored in the tank chamber 41. On the other hand, when the entire rear frame is integrally cast, it is difficult to form a tank chamber wider than the opening 42, and a fuel tank wider than the opening 42 is placed in the rear frame. It is difficult to store, and as shown by a chain line in FIG.
The fuel tank has to be narrower than the width of the
The capacity of the fuel tank must be relatively small.

Ribs 25d and 26d project from the inner surfaces of both rear frame halves 25 and 26 in directions approaching each other so as to define the bottom of the tank chamber 41.
These ribs 25d, 26 d is the rear wheel W _R in order also performs the function of a rear fender for covering the front side upward, the rear wheel W _R of the front-side upper portion being formed in an arc shape corresponding both rear frame half 25, 26 are provided integrally. Moreover, both ribs 25
d, the tip of 26d are inserted on both sides of the seal member 44 ₁ made of an elastic material such as rubber.

As shown in FIG. 6, on the front side and the rear side of the opening 42, the upper edge 25e of the left rear frame half 25 is formed in a substantially L-shaped step shape, and the right rear part is formed. The upper end edge 26e of the frame half 26 can be overlapped with the upper end edge 25e from above to abut it.

By the way, both rear frame halves 25, 26
Has a structure obtained by interposing a sealing member 44 ₁ described above, the upper edge 25e of the above, the structure overlay 26e is being joined so as to be switched at an appropriate position, is interposed a seal member 44 ₁ Any of the above-mentioned structures and the above-mentioned superposed structure may be provided over the entire length of the joint portion between the two rear frame halves 25 and 26.

A pair of left and right rear cushions 17, 17
The ring-shaped connecting portion 17 is
a, 17a, and each connecting portion 17a, 17
a is left rear carrier 21 is provided, the right pair of mounting plate portions 21a, together with 21a, is coupled to the rear frame 12 ₁ by the third bolt 45.

At the positions where the two rear cushions 17, 17 are to be connected, the rear frame halves 25, 26 are integrally provided with cylindrical boss portions 25f, 26f protruding laterally. Further, both ends of the third bolt 45 are connected to the boss portions 2.
It protrudes outward through 5f and 26f. The third bolt 45 has a pair of flanges 45a extending radially outward,
45a are provided integrally, and their flanges 45a,
45a are respectively engaged with the inner surfaces of both rear frame halves 25 and 26.

The projection of the third bolt 45 from the bosses 25f, 26f is attached to the mounting plate 2 of the rear carrier 21.
The nuts 46, 46 are inserted through the connecting portions 17 a, 17 a of the two cushions 17, 17, respectively, and the protruding ends of the third bolts 45 from the connecting portions 17 a, 17. Thus, the mounting together with the two rear frames halves 25 and 26 are coupled to each other by the third bolt 45, the rear frame 12 ₁ of the coupling and a rear carrier 21 of the rear frame 12 ₁ of the two rear cushions 17 and 17 Will be done.

The rear fender 13 is made of a, for example, synthetic resin, both the rear frame halves 25, 26 are bolted to the rear end of the rear frame 12 ₁ formed by bolted to one another.

[0033] Next, to explain the action of this first embodiment, the left which constitutes the rear frame 12 ₁ of the body frame F _1, the right pair of rear frames halves 25 and 26, for example, casting an aluminum alloy or the like by being intended to be, shaped steps is reduced as compared with the conventional by press molding, and in a small mold than to the mold over the longitudinal direction the entire length of the vehicle body frames F ₁ both rear frame halves 25 and 26 Can be cast, casting can be facilitated, and the cast product can be made relatively small to facilitate routing. Moreover, both rear frame halves 2
Since the bolts 5 and 26 are joined by bolts, the number of assembling steps can be reduced as compared with a conventional joint joined by welding.

The main frame 2 of the front frame 11 ₁
By 2 ₁ is of a pipe-shaped metallic is closed cross-section, while enabling downsizing of the front frame 11 _1,
Intensity of said front frame 11 _1, the rigidity can be secured.

Further, a pair of left and right rear frame halves 2
5 and 26 are fastened to each other by first bolts 28 which fasten each other.
Laem 11₁Is the rear frame 12₁To the front
Laem 11₁Rear end, both rear frame halves 25, 26
And the pivot portions 16a, 1 of the rear forks 16, 16
6a are interconnected by second bolts 35, and both rear frames
Third bolt 45 that couples the memory halves 25 and 26 to each other
And both rear cushions 17, 17, rear frame 12₁What
And rear frame 12 of rear carrier 21₁
The rear frame halves 25,
First, second and third bolts for bolting 26
G, 28, 35, 45, the front frame 11 ₁Rear frame
Room 12₁Coupling function to the rear forks 16, 16 cars
Body frame F₁Connection, support function, rear cushion 1
7, 17 rear frame 12₁Connection to the rear
Rear frame 12 of carrier 21₁Has a function to attach to
The number of parts and assembly man-hours
Can be reduced.

By the way, so as to perform also the function of the rear fender for covering the front side above the rear wheel W _R together define the bottom of the tank chamber 41, both the rear frame half 25, 26
With the seal member 44 ₁ projecting from the ribs 25d, 26 d are inserted respectively are capable of formation by extrusion, it is possible to obtain an excellent assembling property, the
The formation of the seal member 44 ₁ can be facilitated.

FIG. 7 shows a first modification of the first embodiment. The rear frame halves 25, 25d are arranged such that the tips of ribs 25d, 26d are vertically spaced.
26 (see FIG. 5) are provided with ribs 25d, 26d, and one of the ribs 25d is provided between the tips of the ribs 25d, 26d.
d is inserted into the upper part on one side and the other rib 26d is inserted into the lower part on the other side, so that the cross section is approximately S.
May also be seal member 44 ₂ is formed in shape is provided, and as a second modification shown in FIG. 8, both the ribs 25d, the seal member cross-section, for example elliptical in between the tips of 26d 44 ₃ may be sandwiched.

[0038] As a second embodiment of the present invention, as shown in Figure 9, the body frame F ₂ is the front frame 11 _1, and the rear frame 12 ₂ is bolted to the rear of said front frame 11 ₁ , a rear fender 13 which is bolted to the rear end of the rear frame 12 _2, may be constituted by a tank accommodating portion 48 which is bolted to the front of the rear frame 12 _2. Rear frame 12 ₂ is left, is constituted by a bolt coupling the right rear frame half, tank accommodating portion 48 is formed, for example, a synthetic resin, the fuel tank 43 (see FIG. 5) is accommodated in the tank accommodating portion 48 Is done.

According to the second embodiment, the rear frame 1
Left constituting the 2 _2, can be more compact casting apparatus for casting each rear frame halves on the right, handling becomes easier for both the rear frame half.

Further omitted the tank accommodating portion 48, it is also possible to dispose the fuel tank on the rear frame 12 _2.

[0041] Figures 10 and 11 show a third embodiment of the present invention, the front frame 11 ₂ is, may be one that is formed by casting, for example such as an aluminum alloy, the front frame 11 _2, for example, a cross section substantially U-shaped frame main portion 22 ₂ which is open downward, a head pipe 23 ₂ which is coupled by welding or the like to the front end of the frame main portion 22 _2, the front end of the frame main portion 22 ₂ parts and is composed of a reinforcing portion 24 ₂ provided over between the head pipe 23 _2, a frame main portion ₂₂₂ has a plurality of ribs 49 ...
Are provided integrally.

Further, the frame main portion may be formed by casting an aluminum alloy or the like so as to have a substantially U-shaped cross section open upward.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above-described embodiment, the left and right rear frame halves are made of a cast metal such as an aluminum alloy, but may be formed of a resin material.

[0045]

As described above, according to the first aspect of the present invention, the pair of left and right rear frame halves constituting the rear frame are formed so as to be easily formed and easily arranged. The number of molding steps and the number of assembly steps can be reduced.

According to the second aspect of the present invention, the first and second bolts for bolting the two rear frame halves are connected to the rear frame of the front frame and to the body frame of the rear fork. , The number of parts and the number of assembling steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle according to a first embodiment.

FIG. 2 is a side view showing the overall configuration of the vehicle body frame.

FIG. 3 is a side view of the vehicle body frame in a disassembled state.

FIG. 4 is an enlarged cross-sectional view taken along line 4-4 in FIG. 2 for showing a combined state of a front frame, a rear fork, and a rear frame.

FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 2 for showing a state of storing the fuel tank in the rear frame.

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 2 for showing an upper connection state of both rear frame halves.

FIG. 7 is a sectional view of a main part for illustrating a first modification of the first embodiment.

FIG. 8 is an essential part cross-sectional view for showing a second modification of the first embodiment.

FIG. 9 is a side view of the vehicle body frame corresponding to FIG. 3 of the second embodiment.

FIG. 10 is a side view of the front frame of the third embodiment.

11 is a plan view as viewed from the direction of arrow 11 in FIG. 10;

[Explanation of symbols]

11 ₁ , 11 ₂ ··· front frame 12 ₁ · 12 ₂ ··· rear frame 16 ··· rear fork 16a ··· pivot part 23 ₁ and 23 ₂ ··· head pipe 25 and 26 ··· rear frame halves 28 ... first bolt 35 ... second bolt F _1, F ₂ ... body frame

Claims (2)

[Claims] 1. A front frame (11 ₁ , 11 ₂ ) having a head pipe (23 ₁ , 23 ₂ ) at a front end and a box-shaped front frame (11 ₁ , 11 ₂ ). In a motorcycle body frame having a rear frame (12 ₁ , 12 ₂ ), a pair of left and right rear frame halves (25, 26) are molded respectively, and the rear frame halves (25, 26) are formed. Are bolted to each other to form rear frames (12 ₁ , 12 ₂ ). 2. A pair of left and right rear frame halves (25,
The front frames (11 ₁ , 11 ₂ ) are connected to the rear frames (12 ₁ , 12 ₁ ) by first bolts (28) that fasten the _two frames to each other.
12 ₂ ) and the front frame (1
11 ₁ , 11 ₂ ) The rear end portion, the pair of left and right rear frame halves (25, 26) and the pivot portion (16 a) of the rear fork (16) are interconnected by the second bolt (35). The body frame of a motorcycle according to claim 1, wherein: