JPS6251790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to motorcycles and tricycles, and particularly to a head pipe, a down tube extending rearward from the head pipe, a rising portion connected to the rear end of the down tube, and a rising portion rising from the upper end thereof. A vehicle body frame is constituted by a pair of left and right side frames each having a horizontal portion extending horizontally to the rear, and a cross member connecting these both side frames, and a power unit is disposed immediately after the rising portion of the both side frames.

In such motorcycles and tricycles, in order to reduce the dimensions of the entire vehicle in the longitudinal and lateral directions without narrowing the riding space for the operator, it is necessary to It is required to bring the power unit close to the side frame by inserting as many parts of the power unit as possible within the limited space between the side frames.

An object of the present invention is to provide a simple and effective motorcycle or tricycle that satisfies such requirements. It is composed of an upper plate bent inward and a lower plate bent outward from the lower end of the main plate, and a part of the power unit is exposed between the main plates of both side frames, so that the power unit can be mounted on both sides. It is located close to the frame.

Hereinafter, an embodiment in which the present invention is applied to a scooter will be described with reference to the drawings. In FIGS. 1 and 2, the vehicle body frame 1 consists of a front frame 1 and a rear frame 1r, and the front frame 1 has a head pipe 2, A down tube 3 extending rearward from the head pipe 2 in an L-shape, a pair of side frames 4, 4' disposed on both left and right sides of the down tube 3, and front ends of these side frames 4, 4'. The bridge member 5 connects the head pipe 2 to the down tube 3, and the intermediate portions of the side frames 4 and 4' are connected to the down tube 3.
The cross member 6 is connected to the cross member 6. The rear frame 1r has both side frames 4 of the front frame 1f,
A pair of side frames 7, 7' are arranged on the left and right with an interval narrower than 4', and these side frames 7, 7' are interconnected at two locations at both ends and at two locations in the middle. The rear end of the down tube 3 is connected to the cross member _{8 1} at the forefront, and the front ends of _the side frames 7 and 7' are connected to the side frames 4 of the front frame 1. , 4' via a cross member 9.

Each of the side frames 7, 7' of the rear frame 1r is bent at the middle part, and has a rising part 10 rising from the joint with the down tube 3, and a horizontal part 11 extending horizontally rearward from the upper end of the rising part 10. has. Each of the side frames 7, 7' is made of steel plate, and as clearly shown in FIGS. 3 and 4, includes a main plate 12 in the vertical direction, and an upper plate 13 bent at a right angle from the upper end toward the inside of the vehicle. Main plate 1
A lower plate 14 bent at a right angle to the outside of the vehicle from the lower end of 2
and each cross member 8 except the front
₂ to ₈₄ are also made of steel plates and consist of a main plate 15, an upper plate 16, and a lower plate 17, and connecting flanges 17a, 17a' are integrally provided at both left and right ends of the lower plate 17.
When joining, the upper plate 16 of each cross member 8 ₂ - 8 ₄ is spot welded 18 to the lower surface of the upper plate 13 of both side frames 7, 7', and the joining flange 17 a of the lower plate 17 of each cross member 8 ₂ - 8 ₄ is , 17a' are spot welded 19 to the lower surface of the lower plate 14 of both side frames 7, 7'. Such spot welding 18, 19 can be performed simultaneously since there is no interference between the respective electrodes. Furthermore, grooves 20 are defined on the outer sides of the side frames 7, 7' by the lower plate 14 of the main plate 12, and these grooves 20 are used for accommodating electric wires and wires 21.

A steering shaft 23a of a front fork 23 that pivotally supports the front wheel 22 is attached to the head pipe 2.
A floor 24 is formed on the front frame 1f. Immediately after the rising portion 10 of the rear frame 1r, there is disposed a power unit 27 that integrally includes an engine 25 and a transmission device 26 that supports and drives the rear wheels 22r. The front end is suspended from the rising part 10 via the link 28, and the rear end is suspended from the shock absorber 2.
It is suspended on the horizontal part 11 via 9. Further, a sheet 30 is provided on the horizontal portion 11.

In this case, as clearly shown in FIG. 3, in the power unit 27, a part of the engine 25, for example, the carburetor 25c and the exhaust pipe 25e, are inserted as deeply as possible between the main plates 12, 12 of the side frames 7, 7'. Therefore, the rear frame 1r is disposed close to the rising portion 10 of the rear frame 1r. What is particularly noteworthy here is that the outward facing lower plates 14, 14 of the side frames 7, 7' are connected to the exhaust pipe 25.
e into the two main plates 12, 12, and if the lower plates 14, 14 are bent inward as shown by the chain lines, the insertion is prevented, Accordingly, the power unit 27 must be moved back from the rising portion 10 of the rear frame 1r. 31 indicates an exhaust muffler.

Incidentally, the present invention can also be applied to a tricycle having one wheel at the front and two wheels at the rear.

As described above, according to the present invention, the rear frame 1
A pair of left and right side frames 7, 7' of R are respectively connected to a main plate 12 in the vertical direction, an upper plate 13 bent inward from the upper end of the main plate 12, and a lower plate bent outward from the vehicle from the lower end of the main plate 12. 14, and the power unit 27 is made to face between the main plates 12, 12 of the rising portions 10 of these side frames 7, 7'. Lower plate 1
4, a part of the power unit 27 can be inserted without being obstructed by the raised portion 10, and the power unit 27 can be placed close to the rising portion 10, contributing to the miniaturization of the vehicle.

In addition, the lower plate 14, together with the main plate 12 and the upper plate 13, gives each side frame 7, 7' a large section modulus, which not only serves to strengthen the rigidity of the rear frame, but also serves to strengthen the rigidity of the rear frame. It is advantageous that it can also be used as an arrangement part for electric wires and wires 21 without being obstructed by the cross members 8 ₁ to 8 ₄ between 7'.

[Brief explanation of the drawing]

Fig. 1 is a side view of a scooter embodying the present invention with the cover removed, Fig. 2 is a perspective view of the body frame of the scooter, and Figs. 3 and 4 are - and - lines in Fig. 1. FIG. 1...Vehicle frame, 1,1r...Front, rear frame, 2...Head pipe, 3...Down tube, 7,7'...Side frame, ₈₁ to ₈₄ ...Cross member, 10...Rising Part, 11...Horizontal part,
12... Main plate, 13... Upper plate, 14... Lower plate, 2
7...Power unit.

Claims (1)

[Claims] 1 A head pipe 2, a down tube 3 extending rearward from the head pipe 2, and a rising portion 1 connected to the rear end of the down tube 3.
0 and a horizontal portion 1 extending horizontally backward from its upper end.
A pair of left and right side frames 7, 7' consisting of 1 and cross members 8 ₁ to 8 that connect these side frames 7, 7'.
₂ constitute the vehicle body frame 1, and the power unit 2 is installed immediately after the rising portion 10 of the side frames 7, 7'.
7, each side frame 7, 7' is connected to the main plate 12 in the vertical direction.
It is composed of an upper plate 13 bent inward from the upper end of the vehicle and a lower plate 14 bent outward from the vehicle from the lower end of the main plate 12, and the rising portions 1 of these side frames 7, 7'
The power unit 27 is placed between the main plates 12 and 12 of
Motorcycles and tricycles characterized by the appearance of