JPH0648349A - Frame structure for scooter type motorcycle - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a frame structure for a scooter type motorcycle that can secure a wide foot space and can reduce weight and cost. [Structure] A pair of left and right main frames 12 are passed through both sides of a unit swing type engine 15, and a rear extension portion (footrest portion of a passenger) 35a of a footboard 35 is arranged above the main frame 12 and above the main frame 12. To do. According to the present invention, the main frame 12 passes on both sides of the unit swing type engine 15, and the main frame 1 is provided in the conventional manner.
Since 2 does not rise from the front of the engine 15, the footboard 35 can be brought as close to the engine 15 as possible, and a wide foot space can be secured. or,
Since the rear extension 35a of the footboard 35, which is the footrest portion of the passenger, is directly supported by the main frame 12, members such as stays for supporting the rear extension 35a are not required, which reduces weight and reduces cost. Can be planned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure for a scooter type motorcycle.

[0002]

2. Description of the Related Art In a conventional frame structure for a scooter type motorcycle, as shown in FIG. 5, a pair of left and right main frames 112 stand up from the front of a unit swing type engine 115, and then above the engine 115 to the rear. It was extending diagonally upward.

[0003]

However, in the above conventional frame structure, since the main frame 112 stands up from the front of the engine 115, a predetermined space is provided between the rising portion of the main frame 112 and the engine 115. It is necessary to provide a gap, and there is a problem that the foot space is reduced by the amount occupied by this gap.

Further, since the rear extension 135a of the footboard 135, which is a footrest of the passenger, is not directly supported by the main frame 112, a stay 136 for supporting the rear extension 135a must be attached to the main frame 112. In addition, the weight and cost are increased.

The present invention has been made in view of the above problems, and a purpose thereof is to ensure a wider foot space with a limited wheel base, and to reduce weight and cost. An object is to provide a frame structure for a scooter-type motorcycle that can be used.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the present invention has a low-floor footrest between a handle and a seat, the lower part of the seat is covered with a vehicle body cover, and In a scooter type motorcycle having extension portions of the footrests arranged on both sides of the cover, a pair of left and right extending rearward from under the footrests and passing under the footrest extension portions, and then extending obliquely upward and rearward. Of the main frame and a sub-frame that is disposed inside the vehicle body cover and connects a front portion and a rear rising portion of the main frame to form a frame structure.

[0007]

According to the present invention, since the main frame does not stand up from the front of the engine as in the conventional case, it is possible to bring the footboard as close as possible to the engine, and therefore, the scooter type motorcycle having a limited wheel base is wider. A foot space can be secured.

Further, since the rear extension portion of the footboard, which is a footrest portion of the passenger, is directly supported by the main frame, members such as stays conventionally required to support the rear extension portion of the footboard are not provided. It becomes unnecessary, and weight reduction and cost reduction can be achieved.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of a rear portion of a motorcycle showing a frame structure according to the present invention, FIG. 2 is a side view of a scooter type motorcycle, FIG. 3 is a partial plan view of the scooter type motorcycle, and FIG. It is a perspective view of a body frame of a scooter type motorcycle.

First, a schematic structure of the scooter type motorcycle 1 will be described with reference to FIGS.

In FIG. 2, reference numeral 2 is a head pipe, and a steering shaft 3 is rotatably inserted in the head pipe 2. A steering wheel 4 is attached to an upper portion of the steering shaft 3, and a front wheel 6 is rotatably supported on a lower portion of the steering shaft 3 via a front cushion 5. In FIG. 2, 7 is a front fender and 8 is a front cowl.

Further, as shown in FIG. 4, one down tube 9 and two side tubes 10 extend downward and rearward from the lower portion of the head pipe 2.

That is, the down tube 9 is provided at the center in the vehicle width direction, and one end (front end) thereof is inserted into and welded to a joint 11 connected to the lower portion of the head pipe 2. The down tube 9 is a joint 1
1 extends obliquely downward, and its rear end is bonded to the center of the cross pipe 13 to be described later in the width direction as shown in FIGS. 3 and 4.

On the other hand, the two side tubes 10 are
Disposed on both sides of the down tube 9, one end (front end) of each
Is inserted into the side portion of the joint 11 and welded. And each side tube 10 is a joint 1
After extending substantially horizontally from 1 toward the side outward, after being bent at a substantially right angle and extending obliquely forward toward the lower side, after being bent at a substantially right angle again and extending obliquely downward toward the rear side , Is bent at an obtuse angle, extends obliquely upward toward the rear, and the front end of the main frame 12 is inserted and bonded to the rear end thereof. As shown in FIGS. 3 and 4, a cross pipe 13 is provided horizontally between the pair of left and right main frames 12, and a reinforcing pipe is provided between the cross pipe 13 and the rising portion at the rear of each main frame 12. The side frame 14 is installed.

By the way, the motorcycle 1 is equipped with a four-cycle unit swing type engine 15 as a drive source. The engine body 16 of the unit swing type engine 15 has a cylinder 16a tilted substantially horizontally and a crankcase. 16b, and a transmission case 17 is integrally formed on one side of the crankcase 16b. One end of the unit swing type engine 15 is connected to the cross pipe 13 via a pair of left and right engine side brackets 18 connected to the lower portion of the front end crankcase 16b and links 19 pivotally connected to the brackets 18. It is connected to and suspended from the worn body side bracket 20.
Also, the other end (rear end) of the unit swing type engine 15
Through the rear cushion 21 to the main frame 12
It is connected to and suspended from the bracket 22 that is attached to the.

Thus, the unit swing type engine 15
A rear wheel 23 is attached to an output shaft (rear axle) (not shown) that extends horizontally inward from the rear of the transmission case 17, and the upper portion of the rear wheel 23 is covered by a rear fender 24. ing.

An air cleaner 25 is attached to the side of the rear fender 24 and above the transmission case 17 of the unit swing type engine 15. A carburetor 26 is connected to the air cleaner 25, and the carburetor 26 is an intake pipe. It is connected to the intake side of the cylinder 16 a via 27.

On the other hand, as shown in FIG. 2, above the unit swing type engine 15, a storage box 29 for storing a helmet 28, a seat 30, and a fuel tank 31.
The fuel tank 31 has a rectangular frame-shaped support frame 32 extending rearward from the main frame 12.
Is attached to. A license bracket 33 is attached below the fuel tank 31, and a portion below the seat 30 is covered with a vehicle body cover 34.

The features of the frame structure according to the present invention will be described with reference to FIG.

The pair of left and right main frames 12 extend obliquely upward to the rear on both sides of the unit swing type engine 15 and are then bent and sharply risen. Then, they are bent again and directed rearward. And extends diagonally upward.

The left and right rear extension portions (passengers) extending rearward from the rear end portions of the footboards 35 are provided on the gently inclined portions 12a of the both main frames 12 which pass laterally of the engine 15. Foot mounting portion) 35a is arranged along the inclined portion 12a, and the rear extending portion 35a is directly supported by the inclined portion 12a.

As shown in FIG. 3, the sub-frame 14 is housed in a vehicle body cover 34, which receives a part of the load of the seat 30.

Thus, according to this embodiment, the main frame 12 passes on both sides of the unit swing type engine 15, and the main frame 12 does not stand up from the front of the engine 15 as in the conventional case. The engine 15 can be brought as close as possible to the engine 15. Therefore, a wider foot space can be secured in the scooter type motorcycle 1 having a limited wheel base.

Further, since the rear extension portion 35a of the footboard 35, which is a footrest portion of the passenger, is directly supported by the main frame 12, it is conventionally required to support the rear extension portion 35a of the footboard 35. Since members such as stays are not required, weight reduction and cost reduction can be achieved.

[0026]

As is apparent from the above description, according to the present invention, a low-floor footrest is provided between the handle and the seat, the lower side of the seat is covered with the vehicle body cover, and the vehicle body is covered. In a scooter type motorcycle having extension portions of the footrests arranged on both sides of the cover, a pair of left and right extending rearward from under the footrests and passing under the footrest extension portions, and then extending obliquely upward and rearward. The main frame and the subframe that is disposed inside the vehicle body cover and that connects the front portion and the rear rising portion of the main frame are configured to include a frame structure, so a wider foot space can be provided with a limited wheel base. It is possible to obtain the effect that the weight can be secured and the weight can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a rear portion of a motorcycle showing a frame structure according to the present invention.

FIG. 2 is a side view of a scooter type motorcycle.

FIG. 3 is a partial plan view of the scooter type motorcycle.

FIG. 4 is a perspective view of a vehicle body frame of a scooter type motorcycle.

FIG. 5 is a partial perspective view of a rear portion of a motorcycle showing a frame structure according to a conventional example.

[Explanation of symbols]

1 Scooter type motorcycle 4 Handle 12 Main frame 15 Unit Swing engine 30 Seat 35 Footboard 35a Rear extension of footboard (passenger foot rest)

Claims (1)

[Claims] 1. A low-floor type footrest is provided between a handle and a seat, the lower side of the seat is covered with a vehicle body cover, and extension portions of the footrest are arranged on both sides of the vehicle body cover. In the frame structure of the scooter-type motorcycle, the left and right main frames extend rearward from under the footrest and pass under the footrest extension, and then extend diagonally upward and rearward.
A frame structure for a scooter type motorcycle, comprising: a sub-frame, which is disposed in the vehicle body cover and connects a front portion and a rear rising portion of the main frame.