JPS6234871A - motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle having a low-floor footrest located between front and rear wheels, and particularly to a motorcycle having a body frame IM structure and a footrest IX. This relates to temporary support relationships.

Motorcycles (e.g., scooters) with a low-floor footrest
, relatively large-diameter steel pipes, press-formed steel products,
Alternatively, they can be combined to form a frame material for the low floor area, and this is arranged as a living member on the center line of the vehicle body, and protrusions that support the left and right footrests are provided on the frame material. was.

However, in order to increase the distance between the front and rear axles of such a motorcycle, it is necessary to increase the length of the frame material in such a way that it can resist the bending moment and torsional moment acting on the frame material of the low floor part. However, when providing a protrusion on the large-diameter frame material in the low floor area, it is necessary to make the protrusion large in the vehicle width direction in order to secure the necessary width of the footrest. It has to protrude, which reduces the bank angle.

An object of the present invention is to provide a #4 motorcycle that is capable of suppressing the protrusion m in the vehicle width direction while ensuring the necessary width of the footrest plate. be.

The purpose of this is to form a low floor part in a downwardly curved shape connected to the head pipe in a motorcycle with a low floor footrest, and to connect the main body frame that extends toward the rear of the vehicle body to the left and right sides. It is formed by a lower main frame of a book and an upper main frame of a tree that is offset upwardly, and the upper and lower main frames are connected to each other by a reinforcing member at the low floor part, and the inclined part of the reinforcing member is Left and right protrusions extending outward in the vehicle width direction are provided on the side surfaces, and the footrest is achieved by supporting a plate with the protrusions.

Husband IJI Hereinafter, one embodiment of the present invention shown in FIGS. 1 to 6 will be described.

FIG. 1 is a schematic left side view of a motorcycle 10 having a low-floor footrest, and FIG. 2 is a plan view of the main parts thereof. The body frame of the motorcycle 10 includes a head pipe 14 that rotatably supports a handle rotation shaft 12 that carries the weight of the front wheel at its lower end, and a head pipe 14 that is connected to the head pipe 14 and extends toward the rear of the vehicle body in a downwardly curved shape. As shown in FIG. 4, the main vehicle body frame 16 is formed with two lower main frames 18 on the left and right that are spaced apart from each other and located at the vertices of a triangle.
, and an upper main frame 22 located above the center thereof. The upper main frame 22 is located on the center line of the vehicle body, and has a horizontal connection frame 24 that interconnects the left and right lower main frames 18 at their rising portions 20.
The IM Q'A of the upper main frame 22 is welded to the upper main frame 22. In addition, each main frame 18, 18, 22 is connected to each other at two locations (near the curved part of the frame at the front and rear of the low-floor footrest A), and the triangular steel plates 2G,
28 are welded and fixed, and a reinforcing frame 23A is located in front of the triangular steel plate 26 and connects the upper main frame 22 and the left and right lower main frames 18, respectively, and the left and right lower main frames 18 are connected in a suitable manner. A reinforcing frame 233 is attached that interconnects the two.

Further, a U-shaped seat support frame 32 is welded to the rising portion 20 of the lower main frame 18 in a horizontal position, and a pair of reinforcing members 34 supporting the seat support frame 32 on the left and right sides are welded in an inclined position. A two-person seat S is placed on the rear end portions of the seat support frame 32 and the lower main frame 18.

In addition, a support shaft 38 is installed on a pair of reinforcing plates 36 that are welded and fixed to the rising portions 20 of the left and right lower main frames 18,
A power unit 42 is tiltably supported on the support shaft 38 via a pair of links 40, and a rear wheel RW and a muffler 4 are mounted on the output shaft of the power unit 42.
4 is supported, and the left and right lower main frames 18
A left-side loose i device 46 is interposed between the horizontal connection frame 21 and the power unit 42, which connect the rear end portions of the two, and a right-side shock absorber 48 is interposed between the horizontal connection frame 21 and the muffler 44. .

The fuel tank 56 is constructed by front and rear triangular steel plates 26.28, which are rigid members, and each main frame 18.18°2.
2, and is welded to the left and right lower main frames 18 in a manner that connects the lower main frames 18. A groove-shaped horizontal member 50.52 is located in the space surrounded by It is fixed by a pair of screws 54 at the front and a rear at a flange 64 protruding from the peripheral wall thereof. The volume of the fuel tank 56 is sufficiently large, with a top wall 58 degrees, a left wall 60 degrees, and a left wall 60 degrees. The right wall 62 is the upper main frame 22° and the lower main frame is, respectively.
An oil supply cylinder 70 is provided upright on the top wall 58, adjacent to the upper main frame 22 and located on the right side of the upper main frame 22. moreover,
The fuel vibrator 100 is pulled out from the bulge 68 formed on the bottom wall 66 of the fuel tank 56, passes through an opening 29 formed in the triangular steel plate 28, and is attached to the rising portion 20 of the lower main frame 18. connected to a filter 5102,
By operating an electromagnetic pump 104 also attached to the rising portion 20, the fuel tank purified through the filter 102 is supplied to the carburetor of the power unit 42 through a fuel vibrator 106.

The body cover 72 of the motorcycle 10 is placed on the low-floor footrest, as shown in FIG. The left and right portions are formed as a footrest plate 74, and the legal footrest 14 portion is screwed and fixed to a member on the vehicle body frame side at two points B and C at the front and rear.

This fixed relationship is illustrated in FIGS. 3, 5, and 6. That is, the reinforcing frame 233 penetrates the left and right lower main frames 18 and projects outward at both ends, and the protruding pieces 30 protruding from both sides of the triangular steel plate 28 are provided with a gentle groove on the front side of the vehicle body. A long vehicle body cover support pipe 84, which is a U-shaped bent pipe that rises at an angle, and a connecting plate 86 that maintains the distance between the vehicle body cover support pipe 84.
An assembly consisting of 88 is fixed using screws, and the footrest plate 14 is fixed to the assembly. A passenger footrest protrusion 76 is protruded from the footrest plate 74 in the vicinity of the triangular steel plate 28 .

In addition, a lid 78 that covers the lubricating valve 70 of the fuel tank 56 in an openable and closable manner is attached to a window formed in the vehicle body cover 72 via a hinge 79. It is designed to be locked with 80 pieces of locking devices.

This embodiment is constructed as described above, and although the interval between the left and right lower main frames 18 and 18 is sufficiently large, the left and right protrusions for holding the footrest plate 74 are Piece 3
0 is fixed to the flange portion (bent portion) of the triangular steel plate 28 that is the inclined side, it is possible to keep the protrusion m in the vehicle width direction small while ensuring the necessary width Q of the footrest plate 74 ( bank angler). By forming the opening 30a for screwing the connection 4Fi88 (a member attached to the vehicle body cover support pipe 84) as a long hole, the fixed position of the protrusion 30 relative to the triangular steel plate 28 can be adjusted slightly in the vertical direction. Even if you change it, it's still good! The protrusion of the root 74 in the vehicle width direction can be maintained immovably, increasing the degree of freedom in designing the vehicle body.

Moreover, the structure in which the protruding piece 30 is welded and fixed to the triangular steel plate 28 does not require a plurality of footrest plate support parts for fixing the frame to the vehicle body, as in conventional vehicle body structures.
It is possible to reduce the number of parts and reduce the weight of the vehicle body.

Furthermore, in this embodiment, in response to the increased distance between the front and rear axles, the main body frame 1 is attached to the low-floor footrest.
Although the rear length of No. 6 lyI is greatly increased, the main body frame 16 is formed by the lower main frame 18゜18 and the tenth main frame 22, which define a large triangular space, and each main frame 18. The structure of the low-floor two-foot rest A, in which .22 is connected by triangular steel plates 26° 28 and reinforcing frames 23A and 23B, has sufficiently high bending rigidity and torsional rigidity, and is able to withstand large bending moments and torsions that act on the vehicle body frame during driving. It can effectively counter the moment.

In addition, the heavy fuel tank 56 is placed in each main frame 18.
．． 22, the torsional moment acting on the main body frame 16 due to the inertial force of the fuel tank 56 during driving is significantly reduced.
It is possible to obtain a high-strength, high-rigidity vehicle body frame without increasing the diameter of 8.16 more than necessary, and while suppressing an increase in vehicle weight.

By placing the fuel tank 56, which was conventionally placed directly in front of the seat F, by placing it between the lower frames, it is possible to lower the center of gravity of the vehicle, but at the same time, the seat S can be moved to a lower position without being constrained by the fuel tank 5G. This has the advantage of lowering the center of gravity of the occupants and reducing the torsional D-ment that acts on the main body frame 16 due to the weight of the rider during driving. It is also possible to reduce the diameter of each main frame by 1g, 18°22, and thereby reduce the weight.

As is clear from the above description, in the present invention, a low floor part is formed in a downwardly curved shape connected to the head pipe, and the main vehicle body frame that is close to the rear of the vehicle body is connected to the left, It is formed by two lower main frames on the right and one upper main frame that deviates upward from the center thereof, and the inclination of the reinforcing member is Left and right protrusions extending in the vehicle width direction are provided on the side surface of the vehicle, and the legs 41 are attached to the protrusions. Because the board was supported, the left
The gap between the right lower main frame can be increased, and the protrusion beyond the lower main frame in the vehicle width direction can be kept small while ensuring the necessary width of the foot 4Jt-t plate. It is. By installing the projecting piece on the reinforcing member, there is no need to use a plurality of members to attach the projecting piece to the intermediate frame, and the number of parts can be reduced and the weight of the structure can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic left side view of a motorcycle according to an embodiment of the present invention, FIG. 2 is a plan view of the main parts thereof, FIG. 3 is an enlarged right side view of the main parts of the motorcycle, and FIG. . Figures 5 and 6 are IV-IV in Figure 3, respectively.
FIG. 4 is a schematic enlarged cross-sectional view taken along lines V-v and VI-Vl. DESCRIPTION OF SYMBOLS 10... Motorcycle, 12... Handle rotation axis, head pipe 14... Head pipe, 16... Main body frame, 18... Lower main frame, 20... Rising part, 21...・Horizontal connection frame, 22... Upper main frame, 24... Horizontal connection frame, 26.28...
Triangle t14, 29...opening, 30...projection, 3
2... Seat support frame, 34... Reinforcement material, 3G.
... Reinforcement plate, 39 ... Support shaft, 40 ... Link, 42
... Power unit, 44... Silencer, 46...
・Left side shock absorber, 48...Right side shock absorber, 50...
Groove type horizontal member, 52...Groove type horizontal member, 54...Screw,
56... Fuel tank, 58... Top wall, 60... Left wall, 62... Right wall, 64... Tsuba, 66... Bottom wall,
68... Swelling portion, 70... Oil cylinder, 72... Vehicle body cover, 14... Foot rest plate, 16... Foot rest protrusion for passenger, 78... Lid, 79...・Hinge, 80...Lock stopper, 84...Vehicle cover support vibe, 86.88・
...Connecting plate, 100...Fuel pipe, 102...Filter, 104...Electromagnetic pump, 106...Fuel pipe.

Claims (1)

[Scope of Claims] In a motorcycle having a low-floor footrest located between the front and rear wheels, the low-floor portion is formed in a downwardly curved shape connected to the head pipe and extends toward the rear of the vehicle body. The main body frame
It is formed by two lower main frames on the left and right and one upper main frame that is offset upward from the center thereof, and the upper and lower main frames are interconnected at the low floor part with a reinforcing member, and the reinforcing A motorcycle characterized in that left and right protrusions extending outward in the vehicle width direction are provided on the inclined side surface of the member, and a footrest is supported by the protrusions.