JP2001071973A - Body frame for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the riding posture of a rider and a foot grounding property regardless of the physique of the rider in detachably mounting seat rails on a front frame supporting an engine. SOLUTION: This body frame includes a rear frame 12 detachably connected to the rear end of a front frame 11, the rear frame 12 including both seat rails 38 each of which consists of a mounting plate 38a taking the form of a flat plate extending upward from its rear on plan view and detachably mounted at the rear end of a front frame 11, and a pipe 38b inclined more gently than the mounting part 38a and extending rearwardly and upwardly from the rear end of the mounting plate 38a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head pipe supporting a front wheel so as to be steerable, and a pair of left and right main frames extending rearward from the head pipe. The present invention relates to a motorcycle body frame in which front ends of a pair of left and right seat rails are connected, and a rider's seat is supported on both seat rails.

[0002]

2. Description of the Related Art Conventionally, such a vehicle body frame is already known, for example, from Japanese Patent Application Laid-Open No. 11-34960.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
A pair of left and right seat rail connecting portions extending upward and rearward is provided at the rear end of the front frame, and the front ends of the pair of left and right seat rails extending gently inclining and rising upward from the seat rail connecting portion are the two seat rails. Welded to the connection.

In consideration of maintenance and the like, it is desirable that the seat rail be detachably attached to the front frame. However, if the front end of the seat rail is detachably connected to the conventional seat rail connecting portion, Since the connecting part has a detachable structure, the distance between the left and right connecting parts in the vehicle width direction is widened, and depending on the physique of the rider sitting on the seat supported on the seat rail, the riding posture and May affect footing.

[0005] The present invention provides a body frame for a motorcycle in which a seat rail is detachably attached to a front frame supporting an engine so that the riding posture and the legging ability can be improved irrespective of the physique of the rider. The purpose is to do.

[0006]

In order to achieve the above object, the present invention provides an engine having a head pipe for supporting a front wheel so as to be steerable, and a pair of left and right main frames extending rearward and downward from the head pipe. The front end of a pair of left and right seat rails is connected to the rear end of the front frame to be supported. The seat rails include a mounting plate extending to the rear end of the front frame and detachably attached to the rear end of the front frame, and a pipe that is inclined more gradually than the mounting portion and extends upward from the rear end of the mounting plate. The rear frame is detachably connected to a rear end of the front frame.

According to such a configuration, the rear frame including the seat rail can be detachably attached to the front frame in preparation for maintenance or the like, and the connecting portion between the seat rail and the front frame can be moved forward from the seat. The rider sits on the seat on the seat rail even if the left and right connecting parts are widened in the vehicle width direction by adopting a detachable structure because they are arranged diagonally downward and away from each other. The physique of the rider does not affect the riding posture and the legging ability.

[0008]

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

1 to 7 show one embodiment of the present invention. FIG. 1 is a side view of a motorcycle, FIG. 2 is a plan view of a body frame, FIG. 3 is a rear enlarged side view of the motorcycle, FIG.
5 is an enlarged plan view of the rear frame and the rear fender, FIG. 5 is a side view of the rear fender, FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 4, and FIG. 7 is a cross-sectional view of the rear fender taken along line 7-7 of FIG. It is.

First, in FIG. 1, a body frame F of this motorcycle is a front frame 1 on which an engine E is mounted.
1 and a rear frame 12 joined to the rear end of the front frame 11.
A front fork 18 that supports the front wheel WF is steerably supported on a head pipe 13 provided at the front end of the vehicle 1. A bar handle 19 is connected to an upper end of the front fork 18.

The front frame 11 supports a multi-cylinder engine E in which a plurality of cylinders, for example, four cylinders are arranged in parallel in the width direction of the body frame F. An arm support member 21 is supported at a rear portion of the crankcase 20 of the engine E, and a rear swing arm 22 that supports the rear wheel WR.
Is pivotally supported by the arm support member 21 via a support shaft 23. A link mechanism 24 is provided between the arm support member 21 and the rear swing arm 22, and a rear cushion unit 25 is provided between the link mechanism 24 and a rear portion of the front frame 11.

The power from the output shaft 26 of the transmission incorporated in the engine E is transmitted to the rear wheels WR via the chain transmission means 27,
7 is a drive sprocket 2 fixed to the output shaft 26.
8, a driven sprocket 29 fixed to the rear wheel WR,
An endless chain 30 wound around the sprockets 28 and 29 is arranged on the left side of the engine E in a state facing forward in the traveling direction of the motorcycle.

Above the engine E, a front frame 11
And a fuel tank 31 supported at the front of the rear frame 12. The fuel tank 31 and the engine E
An air cleaner 32 is disposed therebetween, and a radiator 33 is disposed in front of the engine E.

A plurality of, for example, four exhaust pipes 35, 35,... Connected to the cylinder head 34 of the engine E extend from the front side of the engine E, below the engine E, to the right side of the rear wheel WR. , Is connected to an exhaust muffler 36 disposed on the right side of the rear wheel WR.

The rear frame 12 includes a pair of left and right rear stays 37 extending rearward and upward from the rear end of the front frame 11.
And the front frame 1 above the rear stays 37.
A pair of left and right seat rails 38 extending rearward from the rear end of the vehicle 1 and coupled to the rear ends of the rear stays 37.
A main seat 39 for seating a rider is supported by seat rails 38 behind the fuel tank 31, and a pillion seat 40 for seating a passenger is provided at a position away from the main seat 39 behind the seat rails 38. Supported by

Head pipe 1 in front frame 11
The front of the vehicle body 3 is covered with a front cowl 42 made of synthetic resin. Both sides of the front part of the vehicle body are covered with a center cowl 43 made of synthetic resin connected to the front cowl 42. A lower cowl 44 made of synthetic resin and covering a portion arranged below the center cowl 43 is connected to the center cowl 43. Also front cowl 42
Mirrors 4 for rear confirmation
5 are attached.

A rear fender 46 that covers the upper part of the rear wheel WR is attached to the rear frame 12, and the front wheel WF
Is mounted on the front fork 18. The rear frame 12 and the rear fender 46 are covered with a rear cowl 48.

In FIG. 2, a front frame 11 connects a head pipe 13, a pair of left and right main frames 14, 14 extending downward from the head pipe 13, and a rear end of the main frames 14, 14. And both main frames 14, 14
A support stay 51 for supporting the air cleaner 32 is provided between the front portions of the main frame 14, and the support stay 51 also functions as a cross member for reinforcing the main frames 14, 14.

The main frame 14 is formed by, for example, forming an ingot of an aluminum alloy into a hollow rectangular cross section by a conventionally known extrusion method, and the main frames 14, 14 are formed after the extrusion. The intermediate portion in the longitudinal direction is formed so as to be convexly curved outward.

The bracket 15 is disposed above a front end of a rear swing arm 22 for supporting the rear wheel WR, and is welded to the rear ends of the main frames 14, 14, respectively. And a single cross pipe portion 1 connecting between the frame side portions 15a, 15a.
5b are integrally formed, and are cast and formed of an aluminum alloy or the like so as to be substantially U-shaped in plan view.

At the rear end of the front frame 11, that is, both frame side portions 15a, 15a of the bracket 15, mounting plates 52, 52 for fastening the front ends of the two seat rails 38 in the rear frame 12 are provided. The mounting plates 53 for fastening the front ends of the rear stays 37 in the rear frame 12 are integrally provided so as to project rearward.

A pair of connecting plates 54 for connecting the upper end of the rear cushion unit 25 are integrally provided on the cross pipe portion 15b of the bracket 15 so as to project rearward.

Referring to FIGS. 3 and 4, the seat rail 38 has a flat mounting plate 38a in a side view and a rearwardly extending mounting plate 38a. A front end of the mounting plate 38a is fastened to a mounting plate 52 at a rear end of the front frame 11 by a pair of bolts 55, 55 and nuts 56, 56. Is done. That is, the front end of the mounting plate 38a is detachably connected to the rear end of the front frame 11.

The mounting plate 38a is cast from an aluminum alloy or the like, and the pipe 38b is extruded from an aluminum alloy or the like so as to have a square cross section. The front end of the pipe 38b is welded to the rear end of the mounting plate 38a.

Moreover, the main seat 3 on which the rider sits
9 and the rear end of the mounting plate 38a is shown in FIG.
Are bent so as to enter inwardly from the rear stay 37 in a plan view as shown in FIG.
The rear end and the front end of the pipe 38b are bent inward in the vehicle width direction, and at a portion corresponding to the main seat 39,
The space between the two seat rails 38, 38 is set narrow.
The rear ends of the seat rails 38, 38, that is, the rear ends of the pipes 38b, 38b are bent so that the distance between them decreases toward the rear.

The rear stay 37 is formed by extrusion from an aluminum alloy or the like into a pipe having a square cross section. The rear stay 37 is inclined more steeply than the pipe 38b of the seat rail 38, and is inclined straight upward in a side view. The front end of the rear stay 37 extending in the shape of
Bolts 57 and nuts 5
8

Further, the rear ends of the rear stays 37, 37 are arranged below the rear ends of the seat rails 38, 38 so that the distance between them becomes smaller toward the rear. The rear ends of the seat rails 38 are welded to the upper surfaces of the rear ends of the rear stays 37. As a result, the rear end of the rear frame 12 is formed such that the width thereof becomes smaller toward the rear.

Receiving plates 59, 59 are integrally formed on the inner surfaces of the intermediate portions of the mounting plates 38a, 38a of the two seat rails 38, 38, and both ends of the first support plate 60 extending between the mounting plates 38a, 38a. Are their receiving plates 59,5
9 on. Both ends of a second support plate 61 which protrudes upward from the seat rails 38, 38 are welded to upper surfaces of intermediate portions of the pipes 38b, 38b in the both seat rails 38, 38. A first cross pipe 62 is provided between the rear stays 37, 37 near the front, and a second cross pipe 6 is provided between the rear ends of the rear stays 37, 37.
3 are provided, and intermediate portions between the seat rails 38, 38 and the rear stays 37, 37 are mutually connected by connecting plates 64.

The front of the main seat 39 on which the rider sits is attached to the mounting plates 38 on both seat rails 38,38.
a, 38a are mounted on the rear end portion thereof via an elastic member (not shown). On the other hand, an engaged member 65 is fixed to a first support plate 60 provided between the front portions of the two seat rails 38, 38, and an engagement piece 66 extending forward from the lower end of the front portion of the main seat 39 is provided. The engagement member 65 is engaged from below. The rear part of the main seat 39 has pipes 38b, 38
b is mounted on the front end of the pipe 38b and bolts 67 are attached to the pipe 38b.
Is concluded. That is, the main seat 39 is fixed on the two seat rails 38 with the bolts 67 fastened. However, the main seat 39 can be removed from the two seat rails 38 by loosening the bolts 67.

A bearing member 68 is fixed on a second support plate 61 provided between the intermediate portions of the pipes 38b, 38b. An arm 69 is provided below the pillion seat 40 for the passenger and extends forward. The front end is rotatably connected to the bearing member 68 via a shaft 70. On the other hand, a sheet support plate 71 for receiving the lower rear end of the pillion seat 40 is fixed to the second cross pipe 63 connecting the rear ends of the rear stays 37, 37. And a lock mechanism 7 that can be switched between a locked state and an unlocked state by a key operation of a cylinder lock 72 provided at the rear end of the rear fender 46.
3 are provided. In the unlocked state of the lock mechanism 73, the pillion seat 40 can be rotated such that the rear portion thereof is flipped upward.

Holders 74, 74 are fastened to an intermediate portion between the pipes 38b, 38b.
Steps 75, 75 for the passenger on 0 to put his foot on
Are supported by the holders 74 so as to be foldable. On the other hand, left and right steps 76 for the rider on the main seat 39 to put their feet (see FIG. 1) are a pair of right and left holders 77 fastened to the arm support member 21 (see FIG. 1).
See).

Referring also to FIGS. 5 to 7, rear fender 46 is suspended from rear end of fender main portion 80 disposed above rear wheel WR and rear end of fender main portion 80. It is integrally formed with the rear hanging portion 81 and is made of synthetic resin.

The fender main portion 80 includes a pair of left and right side plates 82, 82 extending vertically inside the pair of left and right rear stays 37, 37, and a bottom plate 83 connecting the lower ends of the side plates 82, 82. It is formed so as to have a substantially U-shaped cross-sectional shape opened upward.

A pair of fitting support portions 84, 84 which resiliently fit into the first cross pipe 62 from above are provided integrally with the bottom plate 83 near the front. Also, both side plates 82, 82
At the lower end from the middle to the rear end of the
Flanges 85, 85 projecting outward so as to abut against the lower surfaces of the flanges 7, 37 are integrally provided.
Fastening portions 85a, 85a to be fastened to the rear stays 37, 37 are formed on the rear ends 5, 85.

The rear end of the mounting plate 38a on the seat rail 38 and the front end of the pipe 38b are bent inward in the vehicle width direction, and the rear end of the mounting plate 38a is Placed in On the other hand, the rear portion of the pipe 38b is disposed on the outer side of the side plate 82, and the notches 86, 86 through which the front end of the pipe 38b is bent from the inner side to the outer side of the side plate 82 are inserted. Are provided on the upper front side of the side plates 82, 82, respectively.

In a portion covered by the main sheet 39, a battery housing portion 87 for housing a battery 88 (see FIG. 3) is formed in the fender main portion 80 at an interval inside the side plates 82, 82. Is done. This battery storage part 87
Is partitioned by a partition wall 89 protruding from the bottom plate 83. Between the partition wall 89 and the side plates 82, 82, mounting plates 38a, 38a, which are a part of the seat rails 38, 38, are provided. A wiring groove 90 whose upper part is covered at the rear end,
90 are formed.

The front ends of these wiring grooves 90, 90 are open at the front end of the fender main part 80, and both wiring grooves 9
Wire harnesses 91 and 92 (see FIG. 6) led out of the rear fender 46 from the front end opening portions of 0 and 90 are passed through the respective wiring grooves 90 and 90.

The wire harness 9 connected to the rear lamp 93 provided at the rear end of the rear cowl 48
1 is passed through the wiring groove 90 on the right side (the left side in FIG. 6) of the two wiring grooves 90, 90 while facing forward in the traveling direction of the motorcycle.

An electronic control unit 9 for controlling the engine
4 (see FIG. 3), the fender main part 8 is located at a position adjacent to the front of the battery housing 87.
0 is formed at the front.

Next, the operation of this embodiment will be described. A pair of left and right seat rails 38, 38 are formed in a flat plate shape in a side view and extend rearward and upward.
A mounting plate 38a removably mounted on the rear end of the mounting plate 3 and the mounting plate 3
And a pipe 38b extending upward from the rear end of the seat rails 38, 3a.
A rear frame 12 including the rear frame 8 is detachably connected to a rear end of the front frame 11.

Therefore, the rear frame 12 including the seat rails 38, 38 can be detachably attached to the front frame 11 for maintenance or the like. In addition, since the connecting portions of the seat rails 38, 38 and the front frame 11 are disposed at a position obliquely downward and forward from the rider's main seat 39, the left and right connection is made by a detachable structure. Even if the space in the vehicle width direction is widened, the rider's physique of the rider who sits on the main seat 39 on the seat rails 38, 38 does not affect the riding posture and the legging ability.

A pair of left and right seat rails 38, 38
And the rear end of the rear frame 12, which is composed of a pair of left and right rear stays 37, 37, is formed so as to decrease in width toward the rear.
A rear cowl 48 that covers the rear frame 12 can be made compact in the left-right direction as shown in FIG.
Can be made more compact.

Further, the rear stays 37, 37 extend linearly in a side view so as to incline at a steeper inclination angle than the pipes 38b, which are rear portions of the seat rails 38, 38. The rear end of the rear cowl 12 can be made compact not only in the horizontal direction but also in the vertical direction, and the rear cowl 48 can be made compact not only in the horizontal direction but also in the vertical direction.

Further, a rear fender 46 supported by the rear frame 12 includes a fender main portion 80 integrally including a pair of left and right side plates 82, 82 and a bottom plate 83 connecting lower ends of the side plates 82, 82, The fender main part 8
0, a rear hanging portion 81 hanging downward from the rear end of the fender. A battery housing portion 87 for housing a battery 88 is provided in the fender main portion 80.
82 are formed at intervals inside. Moreover, between the battery accommodating portion 87 and the both side plates 82, 82, the mounting plate portions 38a, 38 which are a part of the seat rails 38, 38 are provided.
a rear ends thereof are arranged, and their mounting plate portions 38
a, a pair of left and right wiring grooves 90, 90, whose upper ends are covered by the rear ends,
2 and 82 are formed in the fender main portion 80, and each of the wiring grooves 90 and 90 is provided with a rear fender 46 from its front end opening portion.
Wire harnesses 91 and 92 are drawn out.

Accordingly, the wiring of the wire harness 91 reaching the rear lamp 93 at the rear end of the motorcycle does not affect the distance between the two seat rails 38, 38.
Further, since it is not necessary to secure a space for wiring the wiring harness above the seat rails 38, 38, the wiring harnesses 91, 92 can be wired without affecting the width and height of the main seat 39. it can.

An electronic control unit 9 for controlling the engine
The ECU accommodating section 95 accommodating the battery accommodation section 87
Is formed in the main part 80 of the fender in front of the vehicle, so that the wire harness for the ECU connected to the electronic control unit 94 can be shortened as much as possible. Since it is not necessary to wire a harness, the width of the vehicle body below the main seat 39 can be reduced, and the height of the main seat 39 can be reduced.

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.

[0048]

As described above, according to the present invention, the rear frame including the seat rails can be detachably attached to the front frame in preparation for maintenance or the like, and the left and right connections are made by using a detachable structure. Even if the interval in the vehicle width direction of the section is widened, it is possible to improve the riding posture and the legging ability regardless of the physique of the rider sitting on the seat on the seat rail.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a plan view of a vehicle body frame.

FIG. 3 is an enlarged rear side view of the motorcycle.

FIG. 4 is an enlarged plan view of a rear frame and a rear fender.

FIG. 5 is a side view of a rear fender.

FIG. 6 is a sectional view taken along line 6-6 of FIG. 4;

FIG. 7 is a sectional view of the rear fender taken along line 7-7 in FIG. 4;

[Explanation of symbols]

 12 Rear frame 13 Head pipe 14 Main frame 11 Front frame 38 Seat rail 38a Mounting plate 38b Pipe 39 Seat E・ Engine F ・ ・ ・ Body frame WF ・ ・ ・ Front wheel

Claims (1)

[Claims] An engine (E) is provided with a head pipe (13) for steeringably supporting a front wheel (WF) and a pair of left and right main frames (14) extending rearward and downward from the head pipe (13). Front frame (11)
A front end of a pair of left and right seat rails (38) is connected to a rear end of the motorcycle, and a rider's seat (39) is supported on both seat rails (38). A mounting plate (38a) which extends upwardly and is detachably attached to the rear end of the front frame (11); and a rear end of the mounting plate (38a) which is inclined more gradually than the mounting portion (38a). A rear frame (12) including the two seat rails (38) including a pipe (38b) extending rearward from an end is detachably connected to a rear end of the front frame (11). Body frame for motorcycles.