JP3819508B2 - Motorcycle body frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a body frame of a motorcycle 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]
[Prior art]
A front frame made of iron pipe, a press-molded left and right pair of metal rear halves, and a plurality of metal parts such as a rear fender are welded and joined to form a vehicle body frame. As disclosed in JP-A-1-311975, the entire body frame is formed by integral casting, or as disclosed in British Patent No. 1281731, the pair of left and right frame halves are bolted or the like. Conventionally, a vehicle body frame that is combined to form a vehicle body frame is known.
[0003]
[Problems to be solved by the invention]
However, in the case where a body frame is constructed by welding and joining a plurality of metal parts, not only many processes such as blank, draw, home, trim and piercing are required for press forming of the metal parts. Also, in welding connection, spot welding, MIG welding, TIG welding, and the like are necessary, and the number of steps for attaching and detaching to the jig is increased for each welding, and the assembly process of the body frame becomes longer.
[0004]
Further, in the case where the entire body frame is formed by integral casting (Japanese Patent Laid-Open No. 1-3111975), the shape of the cast product becomes large, the mold splitting structure becomes complicated and casting becomes difficult, and the casting product is also handled. It's not easy.
[0005]
Furthermore, in the structure in which the body frame is constructed by connecting the left and right frame halves with bolts or the like (British Patent No. 1281731), the parting structure is simpler than that of the above-mentioned one integrated with the body frame. Thus, although casting is relatively easy, the shape of the cast product still remains large, and the number of bolt joints increases.
[0006]
The present invention has been made in view of such circumstances. A motorcycle that can easily form at least a part of a vehicle body frame and that can be easily handled and can reduce the number of assembly steps of the vehicle body frame. An object of the present invention is to provide a vehicle body frame.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 comprises a front frame having a head pipe at the front end, and a rear frame formed in a box shape and connected to the front frame, and the rear frame comprises: A motorcycle body frame configured by bolting a pair of left and right rear frame halves that are respectively molded, and the rear portion of the front frame is inserted into the rear frame. The front frame is connected to the rear frame by a first bolt that passes through the rear portion and fastens the left and right pair of rear frame halves together.
[0008]
According to the invention of claim 2, in addition to the structure of the invention of claim 1, the second bolt that penetrates the rear end portion of the front frame and fastens the left and right pair of rear frame halves together. The rear bolt of the front frame, the left and right pair of rear frame halves and the pivot portion of the rear fork are connected to each other by the second bolt.
[0009]
According to the invention of claim 3, in addition to the structure of the invention of claim 1 or 2, it further comprises a third bolt for mutually fastening the left and right pair of rear frame halves, The rear carrier, the rear cushion, and the pair of left and right rear frame halves are connected to each other.
[0010]
According to the invention of claim 4, in addition to the structure of the invention of claim 1, 2, or 3, the left and right pair of rear frame halves are provided with bulging portions bulging outward. A tank chamber having an opening at the upper end is formed between the bulging portions, and the width of the opening is smaller than the maximum width of the tank chamber.
[0011]
Further, the invention of claim 5 comprises a front frame having a head pipe at the front end, and a rear frame formed in a box shape and connected to the front frame, and the rear frames are each molded left, A motorcycle body frame constructed by bolting the right pair of rear frame halves to each other, the first frame for fastening the left and right pair of rear frame halves together, and the front frame being the rear frame while it is coupled to, wherein the rear end of the front frame, the left, the pivot portion of the right pair of rear frame half and the rear fork is connected to each other by a second bolt.
[0012]
According to each structure of such Claims 1-5, since a pair of rear frame half bodies which constitute a rear frame among body frames are die-molded, the number of molding processes is less than that by press molding, In addition, both rear frame halves can be molded with a smaller mold than the mold that covers the entire length of the body frame in the front-rear direction, making it easier to mold and easier to handle, and by bolting compared to welding. The assembly requires less assembly man-hours.
[0013]
In particular, according to the first aspect of the present invention, the front frame is coupled to the rear frame by the first bolt for fastening the pair of left and right rear frame halves to each other, so that both the rear frame halves are bolted together. Since the first bolt for doing so can also serve as a coupling to the rear frame of the front frame, it is possible to reduce the number of parts and the number of assembly steps.
[0014]
According to the second aspect of the present invention, the rear end portion of the front frame, the left and right pair of rear frame halves and the pivot portion of the rear fork are connected to each other by the second bolt, whereby both the rear frames The second bolt for bolting the halves can also be used to connect to the rear frame of the front frame and to connect and support the rear fork to the vehicle body frame, reducing the number of parts and reducing the number of assembly steps. Reduction can be achieved.
[0015]
According to the third aspect of the present invention, a third bolt for fastening the left and right pair of rear frame halves to each other is further provided, and the rear carrier, the rear cushion, and the left and right pair of rear frames are formed by the third bolt. The halves can be connected to each other.
[0016]
According to the fourth aspect of the present invention, it is possible to store in the tank chamber a tank whose capacity is increased by increasing the width below the upper end width.
[0017]
Further, according to the configuration of claim 5 , the front frame is coupled to the rear frame by the first bolts for fastening the left and right pair of rear frame halves together, and the rear end of the front frame, the left, The right pair of rear frame halves and the pivot portion of the rear fork are connected to each other with a second bolt, so that the rear part of the front frame is connected with the first and second bolts for bolting both the rear frame halves. Since it can be combined with the frame, and the rear fork can be connected to and supported by the body frame, the number of parts and the number of assembling steps can be reduced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0019]
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 the overall structure of the body frame, and FIG. 3 is a body frame in an exploded state. FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. 2 for showing the front frame, the rear fork and the rear frame coupled together, and FIG. 5 shows the fuel tank stored in the rear frame. FIG. 6 is an enlarged cross-sectional view taken along line 5-5 of FIG. 2, and FIG. 6 is an enlarged cross-sectional view taken along line 6-6 of FIG.
[0020]
First, in FIG. 1, the vehicle body frames F ₁ of this motorcycle includes a front frame 11 _1, and the rear frame 12 ₁ is bolted to the rear of said front frame 11 _1, the bolt to the rear end of the rear frame 12 ₁ And a rear fender 13 to be coupled.
[0021]
The head pipe 23 ₁ is provided at the front end of the front frame 11 _1, the front fork 14 are steerably supported, the front wheel W _F is rotatably supported to the lower end of the front fork 14, the head pipe 23 A steering handle 15 disposed above ₁ is connected to the front fork 14.
[0022]
The rear frame 12 _1, left, are the rear wheel W _R is suspended through a pair of right rear fork 16 ..., rear cushion 17 ... are provided respectively between both rear fork 16 ... and the rear frames 12 ₁ . 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.
[0023]
Most of the front frame 11 ₁ is covered with synthetic resin cover 19 having a leg shield portion 19a. The rear frame 12 ₁ on the front and the sheet 20 is attached 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.
[0024]
2 and 3, the front frame 11 ₁ includes a metal pipe-like frame main body 22 ₁ , a head pipe 23 ₁ coupled to the front end of the frame main body 22 ₁ by welding or the like, and a frame main body 22 ₁ . The reinforcing member 24 ₁ is provided between the front end and the head pipe 23 ₁ .
[0025]
4 through 6, the rear frame 12 ₁ is to the left of an aluminum alloy or the like are cast respectively, a pair of right rear frame half 25, 26 is formed by a bolt coupled to each other, the front frame 11 with the rear portion of the frame main body 22 ₁ is inserted into the front portion of the rear frame 12 ₁ of _1, is bolted to the front of the rear frame 12 ₁ at two locations spaced in the longitudinal direction of the frame main body 22 ₁ .
[0026]
The portion of the frame main body 22 ₁ of the rear end, the first boss 27 a cylindrical penetrating the frame main 22 ₁ so as to protrude from both ends on both sides of the frame main body 22 ₁ is welded. With the inner surfaces of the front end portions of the left and right pair of rear frame halves 25 and 26 being in contact with both ends of the first boss 27, the rear frame half 26 and the second frame half 26 from the right rear frame half 26 side. The first bolt 28 is inserted into the 1 boss 27 and the left rear frame half 25, and the nut 29 is screwed to the end of the first bolt 28 protruding from the left rear frame half 25. As a result, the front portions of the rear frame halves 25 and 26 are bolted to each other, and _one rear portion of the front frame 11 ₁ is bolted to the rear frame 12 ₁ .
[0027]
Also in the rear end lower portion of the frame main body 22 _1, both ends have a second boss 30 cylindrical so as to protrude from both sides of the frame main body 22 ₁ is welded to both ends of the second boss 30, the The support members 31 and 31 that are coaxial with the two bosses 30 are fixed. On the other hand, fitting cylinder portions 25a and 26a for gently fitting both ends of the second boss 30 are integrally projected on the inner surfaces of both rear frame halves 25 and 26 at a portion corresponding to the second boss 30. Cylindrical projections 25b and 26b that are coaxial with the fitting cylinders 25a and 26a are integrally projected on the outer surfaces of the rear frame halves 25 and 26 at a portion corresponding to the second boss 30.
[0028]
The fitting tube portions 25a and 26a determine the relative position between the front frame 11 ₁ and the rear frame halves 25 and 26 almost accurately when the body frame F ₁ and the rear forks 16 and 16 are assembled. Is possible, which facilitates the assembly work.
[0029]
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 a cylindrical support tube is attached to the pivot portions 16 a, 16 a at the front ends of both rear forks 16, 16. 33 and 33 are fixed, and the outer cylinder portions 34a and 34a of the rubber bushes 34 and 34 are press-fitted into the support cylinders 33 and 33, respectively. That is, the rubber bush 34 is formed by baking an elastic portion 34c made of rubber on an inner peripheral surface of a metal outer cylinder portion 34a and an outer peripheral surface of a metal inner cylinder portion 34b that is coaxial with the outer cylinder portion 34a. The outer cylinder part 34 a is press-fitted into the support cylinder 33.
[0030]
Both rear fork 16 and 16, inner cylindrical portion 34b of the rubber bush 34 of the front end portion thereof 16, 16, 34b and projection 25b, is arranged so as to abut against the distal end of the 26b, the vehicle body frames F ₁ From the right side along the front-rear direction, the support member 31, the second boss 30, and the second boss 30 at one end of the second boss 30 between the inner cylinder portion 34b, the protrusion 26b, and the rear frame halves 25, 26 of one rubber bush 34 The second bolt 35 is inserted into the support member 31 at the other end of the two bosses 30, the protruding portion 25 b, and the inner cylindrical portion 34 b of the other rubber bush 34, and the end of the second bolt 35 protruding from the other rubber bush 34 A nut 36 is screwed into the portion. 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 the both rear fork 16, 16 of the pivot portion 16a, 16a is to be connected to the vehicle body frames F ₁ in the swingable.
[0031]
Between the first and second bolts 28, 35, a fastening bolt 37 is inserted into the rear frame halves 25, 26 from the right rear frame half 26, and protrudes from the left rear frame half 25. A nut 38 is screwed onto the end of the fastening bolt 37. Moreover, the fastening bolt 37 is inserted into the hanger members 39 and 40 sandwiched between the rear frame halves 25 and 26, and the engine in the power unit 18 is supported by the hanger members 39 and 40.
[0032]
With particular attention to FIG. 5, bulging portions 25c and 26c bulging outward are provided at the upper portions near the front ends of both rear frame halves 25 and 26, and between the bulging portions 25c and 26c. A tank chamber 41 is formed, and an opening 42 at the upper end of the tank chamber 41 is formed. A fuel tank 43 with the upper end facing the opening 42 is stored in the tank chamber 41. 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.
[0033]
By the way, the rear frame halves 25 and 26 are bolted to each other, thereby forming a tank chamber 41 having a width larger than the width of the opening 42 and having a width lower than the width of the upper end. The fuel tank 43 whose capacity is increased by increasing the capacity 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 that is wider than the opening 42 and a fuel tank that is wider than the opening 42 is placed in the rear frame. As shown by the chain line in FIG. 5, it is difficult to store the fuel tank, and the fuel tank must be made smaller than the width of the opening 42, and the capacity of the fuel tank must be relatively small. Absent.
[0034]
Ribs 25d and 26d project from the inner surfaces of the rear frame halves 25 and 26 so as to define the bottom of the tank chamber 41, and these ribs 25d and 26d to fulfill also the function of the rear fender for covering the front side above the wheel W _R, it is provided integrally formed in an arc shape corresponding to the front side upper portion of the rear wheel W _R in both rear frame halves 25,26. Moreover both the ribs 25d, 26 d tips of is inserted on both sides of the seal member 44 ₁ made of an elastic material such as rubber.
[0035]
As clearly shown in FIG. 6, the upper end edge 25e of the left rear frame half 25 is formed in a substantially L-shaped step on the front side and the rear side of the opening 42, and the right rear frame half The upper end edge 26e of 26 can be overlapped with the upper end edge 25e from above.
[0036]
Meanwhile, both the rear frame half 25, 26 has a structure obtained by interposing a sealing member 44 ₁ described above, the upper edge 25e of the above, since the structure overlay 26e are joined so as to be switched at an appropriate position the case, any structure of the seal member 44 ₁ overlapped structure and the interposed may also be provided over the entire length of the joint portions of the rear frame half 25,26.
[0037]
The pair of left and right rear cushions 17, 17 are provided with ring-shaped connecting portions 17 a, 17 a at the upper ends of the 17, 17, and each connecting portion 17 a, 17 a is a pair of left, right, provided in the rear carrier 21. the mounting plate portion 21a, together with 21a, is coupled to the rear frame 12 ₁ by the third bolt 45.
[0038]
Cylindrical bosses 25f and 26f projecting sideways are integrally provided on both rear frame halves 25 and 26 at a position where both rear cushions 17 and 17 should be connected. Further, both end portions of the third bolt 45 penetrate the boss portions 25f and 26f and protrude outward. The third bolt 45 is integrally provided with a pair of flange portions 45a, 45a extending outward in the radial direction, and these flange portions 45a, 45a are respectively formed on the inner surfaces of the rear frame halves 25, 26. Engaged.
[0039]
Thus, the protruding portion of the third bolt 45 from the boss portions 25f and 26f is inserted into the mounting plate portions 21a and 21a of the rear carrier 21 and the connecting portions 17a and 17a of the rear cushions 17 and 17, respectively. Nuts 46, 46 are screwed onto the protruding ends of the third bolts 45 from 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 made.
[0040]
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.
[0041]
Next, to explain the action of this first embodiment, as 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, being cast molded, for example, aluminum alloy or the like As a result, the number of molding steps is reduced compared to the conventional press molding, and both rear frame halves 25 and 26 can be cast with a smaller mold than the mold over the entire length in the front-rear direction of the body frame F _1. Therefore, casting becomes easy and the cast product can be made relatively small to facilitate handling. Moreover, since both the rear frame halves 25 and 26 are bolted together, the number of assembling steps can be reduced as compared with the conventional one that is joined by welding.
[0042]
Also by the frame main body 22 ₁ of the front frame 11 ₁ is of a pipe-shaped metallic is closed cross-section, while enabling downsizing of the front frame 11 _1, intensities of said front frame 11 _1, Rigidity can be ensured.
[0043]
Further left, the first bolt 28 which allowed to conclude a right pair of rear frames halves 25 and 26 each other to the front frame 11 ₁ is coupled to the rear frame 12 _1, the rear end portion of the front frame 11 _1, both rear frame The halves 25 and 26 and the pivot portions 16a and 16a of the rear forks 16 and 16 are connected to each other by the second bolt 35, and the rear cushions 17 are connected to each other by the third bolt 45 that joins the rear frame halves 25 and 26 to each other. since attachment to the rear frame 12 ₁ of the coupling and a rear carrier 21 of the rear frame 12 ₁ of 17 is performed, the first to bolted both rear frame halves 25 and 26, second and third bolt 28, 35, 45 include a function of connecting the front frame 11 _{1 to} the rear frame 12 ₁ , a connection of the rear forks 16, 16 to the vehicle body frame F ₁ , a support function, It is possible to provide a function of connecting the rear cushions 21 and 17 to the rear frame 12 ₁ and attaching the rear carrier 21 to the rear frame 12 ₁ , thereby reducing the number of parts and the number of assembling steps.
[0044]
Meanwhile, 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, ribs 25d projecting from the both rear frame halves 25 and 26, 26 d, respectively The seal member 44 _{1 to} be inserted can be formed by extrusion molding, an excellent assembling property can be obtained, and the formation of the seal member 44 ₁ can be facilitated.
[0045]
FIG. 7 shows a first modification of the first embodiment. Both the rear frame halves 25 and 26 (see FIG. 5) are arranged such that the ends of the ribs 25d and 26d are spaced apart from each other. Ribs 25d and 26d are provided so as to project between the tips of the ribs 25d and 26d so that the tip of one rib 25d is inserted into the upper portion on one side and the other rib 26d is inserted into the lower portion on the other side. may also be seal member 44 ₂ is provided which is formed in cross section a substantially S-shape, and as a second modification shown in FIG. 8, cross-section, for example elliptical between both the ribs 25d, 26 d of the tip seal member 44 ₃ shape may be sandwiched.
[0046]
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, the rear frame 12 and rear fender 13 which is bolted to the rear end of _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.
[0047]
According to the second embodiment, the left which constitutes the rear frame 12 _2, it can be more compact casting apparatus for casting each rear frame halves on the right, both rear frame half maneuverability easier Become.
[0048]
Also omitted the tank accommodating portion 48, it is also possible to dispose the fuel tank on the rear frame 12 _2.
[0049]
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 frame main portion 22 ₂ having a substantially U-shaped cross section opened downward, a head pipe 23 ₂ coupled to the front end of the frame main portion 22 ₂ by welding, the front end of the frame main portion 22 ₂ , and the head is composed of a reinforcing portion 24 ₂ provided over between the pipe 23 _2, a frame main portion ₂₂₂ has a plurality of ribs 49 ... are provided integrally.
[0050]
Further, the main frame portion may be formed by casting an aluminum alloy or the like so as to have a substantially U-shaped cross-sectional shape opened upward.
[0051]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0052]
For example, in the above embodiment, the left and right pair of rear frame halves are made of a cast metal such as an aluminum alloy, but may be molded by a resin material.
[0053]
【The invention's effect】
As described above, according to the first to fifth aspects of the present invention, the pair of rear frame halves constituting the rear frame of the vehicle body frame is molded so that the number of molding steps is less than that by press molding. In addition, both rear frame halves can be molded with a smaller mold than the mold that covers the entire length of the vehicle body frame in the front-rear direction. Therefore, the left and right pair of rear frame halves can be easily molded and handled easily. As a result, the number of molding steps can be reduced and the number of assembly steps can be reduced.
[0054]
In particular, according to the first aspect of the present invention, the first bolt for bolting both rear frame halves also serves as a coupling to the rear frame of the front frame, thereby reducing the number of parts and assembling man-hours. Can be reduced.
[0055]
In particular, according to the invention of claim 2, the second bolt for bolting the two rear frame halves also serves as a coupling to the rear frame of the front frame and a connection and support of the rear fork to the vehicle body frame. In this way, it is possible to reduce the number of parts and the number of assembly steps.
[0056]
In particular, according to the invention of claim 3, further comprising a third bolt for mutually fastening the left and right pair of rear frame halves, wherein the third bolt includes a rear carrier, a rear cushion and a pair of left and right rear portions. The frame halves can be connected to each other.
[0057]
In particular, according to the fourth aspect of the present invention, a tank whose capacity is increased by increasing the width below the width of the upper end can be stored in the tank chamber.
[0058]
In particular , according to the invention of claim 5 , the first and second bolts for bolting both rear frame halves, the coupling of the front frame to the rear frame, and the connection of the rear fork to the vehicle body frame, It is possible to reduce the number of parts and the number of assembling steps so as to serve as a support.
[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 an entire structure of a body frame. FIG. 3 is a side view of the body frame in an exploded state. FIG. 5 is an enlarged cross-sectional view taken along line 4-4 of FIG. 2 for showing the coupling state of the rear frame. FIG. 5 is an enlarged cross-sectional view taken along line 5-5 of FIG. 2 for showing the storage state of the fuel tank in the rear frame. FIG. 6 is an enlarged cross-sectional view taken along line 6-6 of FIG. 2 to show the upper combined state of both rear frame halves. FIG. 8 is a cross-sectional view of an essential part for showing a second modification of the first embodiment. FIG. 9 is a side view of a vehicle body frame corresponding to FIG. 3 of the second embodiment. Side view of front frame [FIG. 11] Plan view from arrow 11 of FIG.
11 ₁ , 11 ₂ ... front frame 12 ₁ , 12 ₂ ... rear frame 16 ... rear fork 16a ... pivot parts 23 ₁ and 23 ₂ ... head pipes 25 and 26 ... rear part Frame half 28 ... first bolt 35 ... second bolt F ₁ , F ₂ ... body frame

Claims (5)

A front frame (11 ₁ , 11 ₂ ) having a head pipe (23 ₁ , 23 ₂ ) at the front end, and a rear frame (12 ₁ ) formed in a box shape and connected to the front frame (11 ₁ , 11 ₂ ) , 12 ₂ ), and the rear frame (12 ₁ , 12 ₂ ) is formed by bolting the left and right pair of rear frame halves (25, 26) to be respectively molded. A body frame of a motorcycle,
The rear part of the front frame (11 ₁ , 11 ₂ ) is inserted into the rear frame (12 ₁ , 12 ₂ ), penetrates the rear part of the front frame (11 ₁ , 11 ₂ ), and a pair of left and right rear parts The first frame (11 ₁ , 11 ₂ ) is connected to the rear frame (12 ₁ , 12 ₂ ) by a first bolt (28) for fastening the frame halves (25, 26) to each other. Motorcycle body frame. A second bolt (35) that passes through the rear end of the front frame (11 ₁ , 11 ₂ ) and fastens the left and right pair of rear frame halves (25, 26) to each other is further provided. With the bolt (35), the rear end of the front frame (11 ₁ , 11 ₂ ), the left and right pair of rear frame halves (25, 26) and the pivot part (16a) of the rear fork (16) are mutually connected. 2. The body frame of the motorcycle according to claim 1, wherein the body frame is connected. A third bolt (45) for fastening the left and right pair of rear frame halves (25, 26) to each other is further provided. The third bolt (45) allows the rear carrier (21), the rear cushion (17), and The body frame of a motorcycle according to claim 1 or 2, characterized in that a pair of left and right rear frame halves (25, 26) are connected to each other. The left and right pair of rear frame halves (25, 26) are provided with bulged portions (25c, 26c) that bulge outward, and between the bulged portions (25c, 26c) at the upper end. The tank chamber (41) having an opening (42) is formed, and the width of the opening (42) is smaller than the maximum width of the tank chamber (41). Motorcycle body frame as described. Headpipe (23 ₁ , 23 ₂ ) At the front end (11) ₁ , 11 ₂ ) And a front frame (11 ₁ , 11 ₂ ) Connected to the rear frame (12) ₁ , 12 ₂ ) And a rear frame (12) ₁ , 12 ₂ ) Is a body frame of a motorcycle constituted by bolting the left and right pair of rear frame halves (25, 26) which are respectively molded,
A first bolt (28) that fastens a pair of left and right rear frame halves (25, 26) to each other, ₁ , 11 ₂ ) Is the rear frame (12 ₁ , 12 ₂ ) And the front frame (11 ₁ , 11 ₂ ) The rear end portion, the left and right pair of rear frame halves (25, 26) and the pivot portion (16a) of the rear fork (16) are connected to each other by a second bolt (35). Motorcycle body frame.

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