JPS61287883A - Mono-cock body of motor bicycle-tricycle,etc. - 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 [Field of Industrial Application] The present invention particularly relates to the body structure of motorcycles and tricycles such as scooters and family bikes.

[Conventional technology]

In conventional motorcycles and tricycles such as scooters and family bikes, the central part of the body frame between the front and rear wheels is bent downward or a step floor is installed to allow the rider to have a free driving posture and ease getting on and off. The engine, fuel tank, and other equipment are placed inside the rear body at the rear of the vehicle.

Figure 1 shows a body frame used in this type of vehicle.The body frame 1 has the front part of the main vibe 2 curved downward, and the steering stem of the front fork can be rotated at the tip of the body frame 1. In addition to fixing the head vibrator 3 to be supported, brackets are attached to each part of the main vibrator 2, and members such as a step floor, a rear cover, a leg shield, etc. are arranged on the brackets.

Figure 2 shows another conventional example, in which a cradle-type vehicle body frame 7 is constructed by connecting a rear frame 6 to which a steel plate is bonded to the rear end of a down tube 5 shaped like a vibrator with a head vibrator 4 fixed to its tip. The steering stem 9 of the front fork 8 is rotatably supported within the head vibrator 4, and the front and rear portions of the head vibrator 4 are comprised of an inch cover 11 integrally formed with a front cover 10 and an inner box 11a. A floor panel 13 is fixed to the down tube 5 and a floor mat 14 is laid on the upper surface, and the left and right rear covers 16 and 16 are placed around the rear frame 6 to which the engine hanger bracket 15 is fixed. A body 19 is surrounded by a rear body 18 including a center cover 17.

[Problem that the invention seeks to solve]

However, in both of the above-mentioned models, the frame and body are formed separately, so the number of manufacturing steps such as welding and the number of parts is large, making it difficult to reduce work-in-process costs. Because the body frame has a complex shape that combines many parts, it is difficult to reduce costs, and because the rear cover and step floor simply cover the body frame, only the frame carries the load on the body. Was.

SUMMARY OF THE INVENTION An object of the present invention is to significantly reduce the number of parts and manufacturing man-hours, improve workability, and provide a monocoque body that is light and has sufficient strength.

(Means for Solving the Problems) The present invention has been made in view of the above object, and includes a lower frame formed of a plate material at least at the rear of the vehicle body, and a lower frame formed in a bifurcated shape from the center to the rear of the vehicle body. The present invention is characterized in that a strength member is formed by an upper lane forstat formed of a plate material connected to the frame, and a rear body is joined to the lower frame.

[For production]

This allows the rear cover and step floor to be used as strength members, so the load on the vehicle body is widely distributed over the entire monocoque body, and the weight can be reduced.

〔Example〕

Hereinafter, a third embodiment of the present invention in which the present invention is applied to a two-wheeled scooter will be described.
This will be explained based on FIGS. 6 to 6.

The lower frame 20 has two arc-shaped protrusions 20a and 20b at the front and rear parts that cover the engine and the upper part of the model wheel, and the rear part 21a of the step floor 21 is integrally formed with a plate material such as a steel plate at the front end of the lower frame 20. The upper surface of the protrusion 20a is provided with an opening 20c for maintenance of the engine area, and a reinforcing concave rib 22a is formed in the front-rear direction of the central portion of the rear half 21a of the step floor 21. ing.

Note that this lower frame 20 may be formed integrally with the atsuba reinforcement 20.

The leg shield 23 provided at the front part of the vehicle body is composed of a front cover 24 having the front half 21b of the step floor 21 integrally provided at the lower end, and a front pillar 26 surrounding the herald pipe 25. In the center part of 21b, there is a concave rib 2 similar to the rear part 21a.
2b, and a protruding rib 27a extending from the lower end of the front pillar 26 and having an opening-shaped cross section covers the upper surface of the concave protrusion 22b.

Then, the step floor 21 is formed by joining the leg shield 23 with the head vibrator 25 fixed therein and the lower frame 20.

Reference numeral 28 denotes a reinforcing upper reinforcement that is joined to the upper surface of the step floor 21, and the upper reinforcement 28 is connected to the protruding rib 27a of the front pillar 26.
A concave rib 22a of the step floor 21 continuous to the rear end,
A protruding rib 27b with an opening-shaped cross section that covers the upper part of the lower frame 22b, a covering part 28a1 that covers the front part of the lower frame 20, and forked arm parts 28b and 28b that are continuous thereto are integrally formed from a single plate material. An opening 28G for maintenance and connection work is provided on the upper surface of the protruding rib 27b.

The engine 2 is placed at the bottom of the rear end of the step floor 21.
At the same time, the center stiffener 30 and the center bracket 31 for attaching the upper reinforcement 9 and the center stand are fixed, and the upper reinforcement 28 is joined to the upper surface of the step floor 21.
, 28b by connecting the floor cross member 32 between the step floors 21., 28b. Floor unit 33 with lower frame 20 and Atsuba reinforcement 28
, each opening 200 of the protrusion 20a of the lower frame 20 and the protrusion rib 27b of the upper lane forstat 28
．． 28G are each fitted with a cover plate 34,35.

As a result, a strength member 36 with a rectangular cross section consisting of concave ribs 22a, 22b and protruding ribs 27a, 27b is formed in the center of the step floor 21 in the front-rear direction, thereby improving the strength of the step floor 21. Cables such as control cables and wire harnesses can be inserted into the strength member 36. In addition, the rear cushion is the arm part 28 of the upper lane forstat 28.
b.

28b and the floor cross member 32, the load applied to the rear cushion is effectively dispersed by the strength member 36.

The rear body 37 includes left and right rear covers 38, 38, and opening stiffeners 3 provided on the left and right sides of the upper opening edge.
9.39 and a separator 40 that connects the rear ends of the stiffeners 39.39. Each opening stiffener 39.39 has side stiffeners 39a, 39a that reinforce the inner surface of the rear cover 38.38. A hinge bracket 42 is provided at the front of one of the opening stiffeners 39 for attaching a hinge that rotatably supports the seat 41 disposed on the upper surface of the rear body 37.
It is equipped with

Then, by joining this rear body 37 to the upper surface of the lower frame 20 of the floor unit 33, a monocoque body 43 is formed.

Since the floor unit 33 and the rear body 37 can be manufactured by simplifying each component as described above, they have sufficient strength over time, and the space inside the rear body 37 can be used effectively, reducing fuel tank damage. In addition to allowing for free arrangement of items such as the above, it is also possible to provide a large luggage box 44 that can store a helmet.

In the above embodiment, the first half of the step floor is provided on the leg shield, but the entire step floor may be formed integrally with the lower panel, and for a family bike, only the strength member is provided, and the step floor and You can omit the leg shield.

〔Effect of the invention〕

As explained above, the present invention provides a strength member by at least a lower frame made of a plate material, and an upper lane forstat made of a plate material formed in a bifurcated shape from the center to the rear of the vehicle body and continuously installed on the lower frame. Since the rear body is formed on the upper surface of the lower frame to form a monocoque body, the center and rear parts of the vehicle body can be easily and firmly attached, and the load on the vehicle body can be spread over a wide range over the entire monocoque body. It can be dispersed to improve strength and reduce weight. Furthermore, costs can be reduced by simplifying the manufacturing process and significantly reducing the number of parts compared to conventional products.

[Brief explanation of drawings]

1 and 2 show a conventional example, FIG. 1 is a perspective view of a vehicle body frame made of round pipes, FIG. 2 is an exploded perspective view of a cradle type vehicle body frame, and FIGS. 3 to 6 are a perspective view of a vehicle body frame of the present invention. Fig. 3 is an exploded perspective view of the monocoque body, Fig. 4 is an exploded perspective view of the floor unit and rear body, Fig. 5 is an assembled perspective view of the monocoque body, and Fig. 6 is a vertical cross-section of the rear body. It is a front view.

Claims (1)

[Claims] 1. A strength member is formed by a lower frame formed of a plate material at least at the rear of the vehicle body, and an upper lane forstat formed of a plate material formed in a bifurcated shape from the center of the vehicle body to the rear and connected to the lower frame. A monocoque body for a motorcycle, tricycle, etc., characterized in that a rear body is joined to the lower frame.