WO2003000540A1

WO2003000540A1 - Frame structure of motorcycle

Info

Publication number: WO2003000540A1
Application number: PCT/JP2001/005371
Authority: WO
Inventors: Masaaki Yamaguchi
Original assignee: Honda Giken Kogyo Kabushiki Kaisha
Priority date: 2001-06-22
Filing date: 2001-06-22
Publication date: 2003-01-03
Also published as: CN1520367A; TW576384U; KR20030001225A; BR0117059B1; GR20020100282A; BR0117059A; JP3548173B2; CN100391783C; AR033068A1; KR100450290B1; GR1006468B; JPWO2003000540A1

Abstract

A motorcycle in which an engine unit arranged below a main frame extending back downward from a head pipe is suspended from a body frame including the main frame and a pair of left and right rear frames connected to the rear portion of the main frame and extending back upward. The shapes of the parts constituting the body frame are simplified while the number of the parts are reduced. For this purpose, flat portions (14d) confronting the side faces of the main frame (13) composed of a square pipe having a square section are provided at the front ends of the two rear frames (14) respectively, and there are directly attached to the side face of the main frame (13), flat portions (14d) of the two rear frames (14), a pivot plate (17) having at least flat plate portions (18) confronting the side faces of the main frame (13) and supporting a rear fork (21), and hunger plates (16) of which at least portions confronting the side faces of the main frame (13) are formed into a flat plate shape and supporting the engine unit.

Description

Description Frame structure for motorcycle

Field of the invention

The present invention is arranged below a main frame extending from a head pipe to a body frame including a main frame extending rearward and a pair of left and right lyaframes connected to the rear of the main frame and extending rearward. The present invention relates to a motorcycle on which an engine unit is suspended, and more particularly, to an improvement in its frame structure.

Background art

Conventionally, such a motorcycle is already known, for example, from Japanese Patent Application Laid-Open No. H10-16859, etc. In this motorcycle, a rectangular cross section is provided on both sides of a main frame composed of a pipe having a circular cross section. The front end of the rear frame consisting of square pipes and the seat rail is installed.

However, in the prior art described above, in order to attach the front ends of the square frame lya frame and the seat rail to the round pipe main frame, a flat surface is formed on a bracket or the like attached to the main frame, and the lya frame and The non-machined front end of the seat trail is attached to the flat surface. This complicates the configuration of components such as brackets, and it is necessary to improve the shape accuracy of each component. The present invention has been made in view of such circumstances, and provides a frame structure in a motorcycle that can simplify the shape of each part while reducing the number of parts constituting the body frame of the motorcycle. The purpose is to do.

Disclosure of the invention

In order to achieve the above object, the present invention provides a vehicle body frame comprising: a main frame extending rearward and downward from a head pipe; and a pair of left and right lya frames that are connected to a rear portion of the main frame and extend rearward. In a motorcycle in which an engine unit disposed below the main frame is suspended, flat portions opposing the side surfaces of the main frame formed of square pipes having a rectangular cross section are formed at the front ends of both lya frames, respectively. A pivot press for supporting a lya fork, having at least the flat portion of the lya frame and a flat plate facing the side surface of the main frame; A first feature is that a hanger plate and a hanger plate which is formed in a flat plate at least at a portion facing the side surface of the main frame and suspends the engine unit are directly attached to the side surface of the main frame.

According to the configuration of the first feature, it is not necessary to attach a bracket or the like to the main frame, and to the main frame, the flat portion at the front end of the rear frame, and the main frame of the pivot plate and the hanger plate. The front end of the rear frame can be simple because the number of parts can be reduced because brackets are not required, and both sides of the main frame are flat. It is only necessary to make it a flat part, and it is not necessary to apply special processing to the pivot plate and the eighting plate for mounting on the main frame, and it is possible to simplify the shape of each part that constitutes the body frame it can.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a cross member that connects between the front portions of the both frame frames is attached to a rear upper surface of the main frame. According to the configuration, the rear part of the main frame can be used as a reinforcing member for the pair of left and right lyaframes.

Further, in the present invention, in addition to the configuration of the first aspect, the pivot plate includes a pair of the flat plate portions parallel to each other and a connecting plate portion for connecting rear ends of both flat plate portions to each other, and includes a front plate. An intermediate portion of a pair of connecting pipes formed to have a substantially U-shaped cross-sectional shape and opened on both sides of the main frame and connecting the front portions of the two lary frames and the connecting plate portion. The third feature is that the power supply is attached to both rear side surfaces of the main frame.

According to the configuration of the third feature, the front frame assembly including the main frame and the pivot plate, and the rear frame assembly including the pair of left and right rear frames are assembled in advance, respectively. The body frame of the motorcycle can be constructed by connecting the front and rear frame assemblies to each other and connecting the front and rear frame assemblies by connecting pipes. Work efficiency can be improved.

BRIEF DESCRIPTION OF THE FIGURES

1 to 8 show a first embodiment of the present invention. FIG. 1 is a side view of a motorcycle. Fig. 2, Fig. 2 is a side view of the body frame, Fig. 3 is a plan view of Fig. 2, as viewed in the direction of arrow 3, Fig. 4 is a rear view of Fig. 2, as viewed in the direction of arrow 4, Fig. 5 is a perspective view of the body frame, and Fig. 6 is a motorcycle. FIG. 7 is a cross-sectional view taken along the line 7-7 in FIG. 6, FIG. 8 is a perspective view corresponding to FIG. 5 when the vehicle body frame is assembled, and FIG. 9 is a view of the second embodiment. FIG. 4 is a plan view corresponding to FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

A first embodiment of the present invention will be described with reference to FIGS. 1 to 8. First, in FIG. 1, a body frame F serving as a skeleton of the motorcycle includes a head pipe for supporting a front fork 11 so as to be steerable. A single main frame 13 extending downward from the head pipe 12 downward, and a pair of left and right lyaframes 14 constructed at the rear of the main frame 13 and extending upward. A front wheel WF is rotatably supported at a lower end of the front fork 11, and a steering handle 15 is connected to an upper end of the front fork 11.

2 to 5, the main frame 13 is formed of a square pipe having a rectangular cross section having a pair of left and right side surfaces extending in the vertical direction in parallel with each other. The hanger plates 16 and 16 are directly attached to both sides of the intermediate portion of 3 by welding, respectively, and the pipe plate 17 is directly attached to both sides of the rear of the main frame 13 by welding.

The hanger plates 16 and 16 are formed in a flat plate shape at least at portions opposing both side surfaces of the main frame 13. The opposing portions of the hanger plates 16 and 16 to the main frame 13 are formed. It can be installed directly on both sides of the main frame 13.

The pivot plate 17 includes a pair of parallel flat plates 18 and 18 facing both sides of the main frame 13 and a connecting plate for connecting the rear ends of the flat plates 18 and 18 to each other. 19 and is formed so as to have a substantially U-shaped cross-sectional shape opened forward and the upper portions of both flat plate portions 18 and 18 are directly attached to the rear side surfaces of the main frame 13. Attached.

An engine unit E is disposed below the main frame 13. The engine unit E is suspended on the body frame F so as to be supported by the hanger plates 16, 16 and the pivot plate 17. . Between the flat plate portions 18 and 18 of the pivot plate 17, there are provided cylindrical support shafts 20 projecting both ends outward from the flat plate portions 18 and 18. At both end portions of the support shaft 20, The front ends of a pair of left and right lyaforks 21 are vertically swingably supported, and a rear wheel WR is pivotally supported between the rear ends of the lyaforks 21.

The rear frame 14 extends upward from the rear side surface of the main frame 13 and is formed so as to move away from the main frame 13 along the width direction of the body frame F as going rearward, and A second frame portion 14b extending rearward and upward from the rear end of the first frame portion 14a at an inclination angle larger than the inclination angle of the first frame portion 14a; and a smaller angle than the inclination angle of the second frame portion 14b. A round pipe with a circular cross section is bent and formed so as to have an integral third frame part 14c extending rearward from the rear end of the second frame part 14b at an inclined angle. .

A tail frame 22 connects the rear ends of the lya frames 14 and 14, that is, the rear ends of the third frame portions 14 c and 14 c. At the front ends of the two frame frames 14, 14, that is, at the front ends of the first frame portions 14a, 14a, flat portions 14d, 14d, 14 d are formed, and these flat portions 14 d and 14 d are respectively directly attached to both side surfaces of the main frame 13 by welding.

A first cross member 123 made of a round pipe is provided between the rear portions of the second frame members 14b, 14b in the both frame frames 14, 14, and the rear portions of the first frame members 14a, 14a in the both frame frames 14, 14. A second cross member 124 made of a round pipe is provided between the two. Moreover, the intermediate portion of the second cross member 24 is attached to the upper surface of the rear portion of the main frame 13 by welding. Further, a support plate 25 is provided on the front side of the second cross member 24 and between the two lary frames 14, 14.

Further, a pair of connecting pipes 26, 26 are arranged on both sides of the rear portion of the main frame 13, and one ends of the connecting pipes 26, 26 are connected to the first and second frame portions 14a of both the lary frames 14, 14. , 14b are attached by welding to the bend, and the other ends of both connecting pipes 26, 26 are It is commonly attached to the rear surface of the connecting plate 19 by welding. Ie mainframe

A pair of connecting pipes 26, 26 arranged on both sides of the 13 connects the front portions of both lyaframes 14, 14 and the connecting plate 19, and an intermediate portion of these connecting pipes 26, 26 It is attached to each side of the rear part by welding. With reference to FIGS. 6 and 7, the upper part of the rear wheel WR is covered with a lya fender 27 attached to the lya frames 14, 14. Fuel supported by the support blocks 28, 28 fixed to the bent portions between the second and third frame portions 14b, 14c; 14b, 14c, respectively, and the rear portions of the third frame portions 14c, 14c. Tank 29 is arranged.

In the rear frames 14, 14, the bent portions between the second and third frame portions 14b, 14c; 14b, 14c are provided with a pair of bracket plates 30 so as to be located below the support blocks 28, 28. , 31.. Are fixed, and between the bracket plates 30, 31... And the rear portions of the two forks 21.

A weld nut 33 is fixed to the inner surface of the inner one of the pair of bracket plates 30, 31, and both bracket plates 30, 31 and their bracket plates 30, 31 are fixed to each other. The port 34 that is passed through the bracket plate 30 from the bracket plate 30 side is screwed into the weld nut 33 with the upper end of the lya cushion unit 32 sandwiched between the brackets 31, so that the upper end of the lya cushion unit 32 becomes the bracket plate 30. , 31 to the frame 14.

By the way, a fuel tank 29 is disposed on the inner side of the bracket plates 30, 31.To keep the width of the motorcycle as small as possible, the tip of the port 34 should be as close as possible to the fuel tank 29. If the tip of the port 34 is directly opposed to the side of the fuel tank 29, the tip of the port 34 may come into contact with the side of the fuel tank 29 due to vibration during motorcycle driving. Therefore, a wall plate 27 a interposed between the bracket plate 31 and the fuel tank 29 is provided on the ryafender 27.

Therefore, the tip of Porto 34 is located as close as possible to fuel tank 29. Even so, the presence of the partition plate 27a can prevent the tip of the port 34 from coming into contact with the fuel tank 29.

A storage box 35 for storing a helmet (not shown) is disposed in front of the fuel tank 29, and the storage box 35 is provided between the front portions of the both frame frames 14 and 14. The support plate 25 is fixedly supported by the support blocks 25 and the support blocks 28, 28 attached to the lya frames 14, 14, respectively.

A cover 38 made of synthetic resin is attached to the body frame F so as to cover the body frame F. The cover 38 is attached to the front side covers 39 arranged on the left and right sides of the main frame 13. …, The front shield of both front side covers 3 9… so as to cover the occupant's legs from the front, and the both front shields 4 0… to cover the head pipe 12 from the front. The front top cover 41 connected to the front top cover 41 and the front top cover 41 covers the head frame 12 from the rear side and covers the main frame 13 from above. Under side cover 4 3… which is connected to the lower part of the front side cover 3 9…, and Lya side cover 4 4… which covers the lya frames 14, 14, fuel tank 29 and storage box 35 from both sides In constructed.

Between the upper parts of the two side cover covers 4, an evening demister 45 covering the storage box 35 and the fuel tank 29 from above enables storage and removal of articles to and from the storage box 35. It is arranged to be openable and closable.

Next, the operation of the first embodiment will be described. The main frame 1 has a square frame with a rectangular cross section at the front end of the lyaframes 14, 14. The flat portions 14 d, 14 d opposing the side surfaces of the main frame 13 are formed on the flat plate portions 18, 18 opposing the side surfaces of the main frame 13, respectively. , 16 are formed in a flat plate at least at a portion facing the side surface of the main frame 13.

Therefore, when attaching the front ends of the rear frames 14, 14, the pivot plate 17 and the hanger plates 16, 16 to the main frame 13, it is not necessary to attach brackets, etc., to the main frame 13. On the side of the main frame 13, flat portions 14 d and 14 d at the front end of the lya frames 14 and 14, and a pivot The plate 17 and the portions of the hanger plates 16 and 16 facing the main frame 13 can be directly attached, and the number of parts can be reduced by eliminating the need for the bracket. In addition, since both side surfaces of the main frame 13 are flat surfaces, the front end portions of the lary frames 14 and 14 need only be simple flat portions 14 d and 14 d, and the pivot plate 17 and the hanger plate 16 can be used. , 16 need not be specially processed for attachment to the main frame 13, and the shape of each component constituting the body frame F can be simplified.

Also, since the second cross member 24 connecting the front portions of the two frame frames 14 and 14 is attached to the upper surface of the rear portion of the main frame 13, the rear portion of the main frame 13 is used as a reinforcing member for the pair of left and right frame frames 14 and 14. Can be used. Further, the pivot plate 17 has a pair of mutually parallel flat plate portions 18 and 18 and a connecting plate portion 19 for connecting the rear ends of both flat plate portions 18 to each other, and has a substantially U-shaped cross section opened forward. A pair of connecting pipes 16, which are formed to have a shape and are arranged on both sides of the main frame 13 and connect the front portions of the two lary frames 14, 14 and the connecting plate portion 19, have an intermediate portion between the main frames. It is mounted on each of the 13 rear sides.

Therefore, as shown in FIG. 8, a front frame assembly UF including a head pipe 12, a main frame 13, hanger plates 16, 16 and a pivot plate 17, a pair of left and right lya frames 14, 14, and a tail frame 22 are provided. The first and second cross members 23 and 24 and the rear frame assembly UR including the support plate 25 are assembled in advance, and the front and rear frame assemblies UF and UR are connected to each other. The front and rear frame assemblies UF, UR can be connected by the connecting pipes 26, 26 to form the motorcycle body frame F of the motorcycle, so that the assembling work efficiency can be improved. .

FIG. 9 shows a second embodiment of the present invention, in which the front ends of the lya frames 14, 14 are crushed to form flat portions 14d ', 14d', and the flat portions 14d ', 14d' are formed. May be directly attached to the rear side surfaces of the main frame 13.

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

Claims

The scope of the claims

1. A body frame including a main frame (13) extending downward from the head pipe (12) and a pair of left and right rear frames (14) connected to the rear of the main frame (13) and extending upward. In a motorcycle in which an engine unit (E) disposed below the main frame (13) is suspended, a flat surface facing a side surface of a main frame (13) formed of a square pipe having a rectangular cross section is mounted on the main frame (13). Portions (14d, 14d ') are respectively formed at the front ends of both lyaframes (14), and are formed on the flat portions (1d, 14d') of both lyaframes (14) and the side surfaces of the main frame (13). A pivot plate (17) having at least an opposing flat plate portion (18) and supporting a lyafork (21); and at least a portion opposing a side surface of the main frame (13) is formed in a flat plate shape to form an engine unit. Tsu Doo and (E) Hangabureto (16) for supporting the but frame structure in a motorcycle, characterized in that mounted directly to the side of the main frame (13).

2. The frame structure for a motorcycle according to claim 1, wherein a cross member (24) for connecting between front portions of the both frame frames (14) is attached to a rear upper surface of the main frame (13). .

3. The pivot plate (17) has a pair of flat plates (18) parallel to each other and a connecting plate (19) connecting the rear ends of both flat plates (18) to each other. The main frame is formed to have an open substantially U-shaped cross section.

The middle part of a pair of connecting pipes (26) arranged on both sides of (13) and connecting the front part of the two lya frames (14) and the connecting plate part (19) is the main frame.

The frame structure for a motorcycle according to claim 1, wherein the frame structure is attached to both rear side surfaces of the rear part of the motorcycle.