JPS61287884A - 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 curves the front part of the main vibe 2 downward, and rotatably supports the steering stem of the front fork at its tip. In addition to fixing the head vibrator 3, a bracket is 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 bracket.

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 vibration 4, and the front and rear parts of the head vibration 4 are comprised of an inner 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 glue 7 covers 16.16 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 consisting of a center cover 17 and a center cover 17.

(Problems to be solved by the invention) However, in both of the above-mentioned products, the frame and body are formed separately, which requires a large number of manufacturing steps such as welding, and a large number of parts, resulting in lower work-in-process costs. It is difficult to reduce costs, especially in the latter case because the body frame has a complex shape that combines many parts, and the rear cover and step floor simply cover the body frame. , the load on the car body was carried only by the frame.

Therefore, an object of the present invention is to significantly reduce the number of parts and manufacturing man-hours, improve workability, and provide a lightweight monocoque body with sufficient strength.

[Means for solving problems]

The present invention has been made in view of the above-mentioned object, and provides a vehicle body such as a motorcycle or tricycle with a lower frame formed of a plate material integrally with a step floor, and an upper reinforcement formed of a plate material fixed on the lower frame. The present invention is characterized in that a floor unit is formed by the above-mentioned lower frame, and a rear body is joined onto the lower frame to form a monocoque body.

(Function) As a result, the rear cover and step floor can 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. 5 to 5.

The main panel 21, which serves as the substrate of the body 20, includes a front frame part 23 that supports the lower end of the head vibrator 22, a low step floor part 24 arranged between the front and rear wheels, and a rear part of the floor part 24. A rear frame part 25 that extends in a circular arc over the engine and rear wheels at the lower part of the rear body is integrally formed from a single plate, and the front frame part 23 has a steering stem of a front fork inserted through it. An insertion hole 23a is formed, a concave rib 24a is provided at the center of the step floor section 24 in the longitudinal direction, and a reinforcing rib 25a is provided at the rear end of the rear frame section 25.

The head vibe 22 has corner flanges 22a and 22b for joining at the upper and lower ends, respectively, and the front and rear parts of the head vibe 22 are covered with a front plate 26 and a front biller 27, and are joined onto the front frame portion 23 of the main panel 21. At the lower part of the front pillar 27, a protruding rib 27a extending over the front part of the concave rib 24a of the step floor part 24 is provided.

On the upper surface of the main panel 21, there is an upper reinforcement 28 that is continuous with the rear end of the protruding rib 27a of the front pillar 27 and extends from the concave rib 24a of the step floor section 24 to the reinforcing rib 25a of the rear frame section 25. A lower reinforcement 29 is provided facing each other from the rear part of the concave rib 24a of the step floor part 24 to the rear end of the rear frame part 25, and both reinforcements 28
29 forms a strength member 30, and the step floor 24, rear frame 25, and this strength member 30 form a floor unit 31.

In addition, the lower reinforcement 29 is installed using brackets 2 to attach the rear suspension on both sides of the rear.
9a, 29a, and the load applied to this rear suspension during driving is effectively distributed by the reinforcing floor cross member 32 fixed to the rear frame 25 above the brackets 29a, 29a and the strength member 30. be able to.

The rear body 33 includes left and right rear covers 34, 34, and opening stiffeners 3 provided on the left and right sides of the upper opening edge.
5, 35, and a separator 36 that connects the rear ends of the stiffeners 35 and 35, and the front part of one opening stiffener 35 rotatably supports a seat arranged on the upper surface of the rear body 33. A hinge bracket 37 is provided for attaching a hinge.

Then, by joining this rear body 33 to the upper surface of the rear frame 25 of the floor unit 31, the monocoque body 20 is formed.

FIG. 6 shows another embodiment, in which a protruding rib 38 is integrally formed on the main panel 21 in place of the separately formed atsuba reinforcement in the above embodiment, and a lower reinforcement at the bottom of the main panel 21 is provided. The strength member 39 is constituted by the joint 29, and thereby the man-hours for manufacturing the product and the labor for joining can be saved.

In this embodiment, as described above, each component of the floor unit 31 and rear body 33 can be manufactured by simplifying them.
It is lightweight and has sufficient strength, and the space inside the rear body 33 can be used effectively, allowing for free placement of fuel tanks, batteries, etc., as well as a large luggage box that can store a helmet. becomes.

〔Effect of the invention〕

As explained above, the present invention forms a floor unit by providing a strength member in the center longitudinal direction of the main panel which integrally forms the step floor 1 and the rear frame, and connects the rear body to the upper surface of the seven frames to form a monocoque. Since it is built into the body, the rear cover and step floor can be used as strength members, and the load on the vehicle body can be widely distributed over the entire monocoque body, improving strength and reducing 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 the drawing]

1 and 2 show a conventional example, FIG. 1 is a perspective view of a vehicle body frame with a round vibrator, FIG. 2 is an exploded perspective view of a cradle type vehicle body frame, and FIGS. 3 to 5 are views of the present invention. Fig. 3 is an exploded perspective view of the monocoque body, Fig. 4 is an assembled perspective view of the monocoque body, and Fig. 5 is an exploded perspective view of the monocoque body.
The figure is a longitudinal sectional view of the rear body, and FIG. 6 is a longitudinal sectional view of the rear body showing another embodiment. 20... Monocoque body 21... Main panel 22... Head vibe 23... Front frame part 24... Step floor part 25...
・Rear frame part 28...Upper reinforcement 29...Lower reinforcement 30...
・Strength member 31...Floor unit 32...
・Floor cross member 33...Rear body
34...Rear cover 38...Protrusion riff 39...
・Strength member patent applicant: Honda Motor Co., Ltd.

Claims (1)

[Claims] 1. A floor unit is formed by a main panel in which the step floor and the rear frame are integrally formed from plate materials, and a strength member arranged in the longitudinal direction of the center of the main panel, and the rear body is joined to the upper surface of the rear frame. Monocoque bodies for motorcycles, tricycles, etc. featuring