JPS6256036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft drive type small vehicle.

Off-road tricycles equipped with ultra-low pressure tires called balloon tires have been put into practical use.
Conventionally, a chain and sprocket drive mechanism has been generally adopted, but instead of this, a shaft drive type drive mechanism is also being contemplated.

This kind of tricycle is composed of a pipe frame,
It does not have a body shell and uses a horizontally mounted engine and transmission with a crankshaft and countershaft.
When a shaft drive mechanism is adopted, the drive gear mechanism on the countershaft side is preferably located on one side of the transmission case. Therefore, a driven gear mechanism is provided at a biased position near one end of the axle of the rear wheel, and this is connected to the drive shaft. They must be connected in a system.

By the way, this type of tricycle does not have a body shell, but has a pipe frame body, and a driven gear mechanism and drive shaft system are installed on the outside of the frame, making it difficult to drive on rough road surfaces such as gravel, grassland, and wasteland. It is necessary to protect the drive mechanism from flying stones and the like, and secondly, it is desirable to transmit power over the center of the vehicle body, preferably at the axle.

The present invention has been made in view of the above, and its purpose is to make the engine output shaft face one side of the transmission case, provide a drive gear mechanism thereon, and provide a driven gear mechanism in the middle of the axle. These are connected by a drive shaft system disposed diagonally across above the axle support member, so that the shaft system and driven gear mechanism are exposed between the frames, and these mechanisms and systems are surrounded by the frame. To provide a shaft drive type small vehicle which can be protected and transmit power at the center of the axle.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic side view of the tricycle, Fig. 2 is a perspective view of only the frame, and Fig. 3 is a side view of the same.
FIG. 4 shows the same plan view.

A single front wheel 5 serving as a steering wheel is supported on a head tube 3 at the front end of the frame 2 of the tricycle 1 so as to be steerable via a front fork 4, and the front fork 4 is steered by a handle 7 on a top bridge 6 at the upper end. The fuel tank 8 is mounted on the front upper part of the frame 2, and the engine 9 is mounted on the front lower part.
A seat 10 is arranged behind the fuel tank 8. The frame 2 is made of a joined body of pipe materials, for example as shown in FIGS. 2 to 4, with one backbone frame 2a extending slightly diagonally backward and downward from the upper rear part of the head tube 3 at the front end, and one , one down tube 2b is extended downwardly diagonally from the lower rear part of the head tube 3, a pair of left and right down tube blowers 2c, 2c are extended rearward from the lower end of the down tube 2b, lower 2c, 2
Center frame 2 diagonally upward and forward from the rear end of c.
d and 2d are integrally bent, and their front ends are joined to both rear ends of the back bone frame 2a.
e horizontally and attach steps to the protruding parts at both ends. Incidentally, the backbone frame 2a and the down tube blower 2c constitute a main frame. The upper and lower front ends of the rear frames 2f, 2f, which are U-shaped on the side, are joined to the center frames 2d, 2d, respectively, and a second cross member 2g is horizontally suspended between the rear ends of the lowers 2c, 2c. 2f, 2
The front ends of the lower parts 2h and 2h which are the axle support members of f are joined, and the front ends of the lower parts 2h and 2h and the cross member
A cross plate 2i is installed between the rear parts of g.
Then, a sub pipe 2j is constructed between the upper rear corner portions of the rear frames 2f, 2f and the rear lower portion of the center frame 2d. Furthermore, the rear frame 2f, 2
End members 2k, 2k extend rearward from the rear upper part of f, and the rear parts of the end members 2k, 2k are connected to the rear lower part of the rear frames 2f, 2f by sub-members 2m, 2m. The brackets 11, 11 are fixedly installed.

A holding member 12 for the axle 13 is installed between the brackets 11, 11, and rear wheels 25, 25 forming driving wheels are attached and supported at both ends of the axle 13, and one end of the holding member 12 is attached to the middle of the axle 13 in the vehicle width direction. A gearbox 14 is provided in the section, and a final driven bevel gear 15 is provided on the axle 13 within the gearbox 14, and a bevel gear 17 of a final drive shaft 16 that is supported and extends diagonally forward with respect to the axle 13 is meshed with this. Seshime, axis 1
6 is rotatably supported by a gear box 14. The driven gear mechanism B is composed of the above gears.

The engine 9 has a horizontal crankshaft, and the countershaft 18 of the transmission mechanism forms the output shaft.
is placed horizontally, one end of the countershaft 18 faces one side of the transmission case 9a at the bottom of the engine, and one end of the countershaft 18 has a drive bevel gear 1.
On the other hand, a driven shaft 20 extends diagonally rearward, and a driven bevel gear 21 provided on this is meshed with the bevel gear 19. These gears are covered with a case 22 provided on one side of the transmission case 9a, and the driven shaft 20 extends diagonally rearward. At 22 the shaft 20 is supported. The drive gear mechanism A is configured as described above.

In the above, the driven gear mechanism B is the rear frame 2
On the other hand, the drive gear mechanism A faces the outside of the rear lower part of the center frame of the frame, and one is at or near the center line of the vehicle body, and the other is biased to the side. It happens. The shafts 20 and 16 of each mechanism are connected by a propeller shaft 23 arranged diagonally, with the front end facing outward and the rear end close to the vehicle body center line.
24 in FIG. 7 is a torque limiter. As an overall explanation of the above, an explanatory plan view is shown in FIG.

As is clear from the above, according to the present invention, the countershaft is placed horizontally, and the drive gear part constituting the shaft drive mechanism is disposed on one side of the transmission case, so that the cover of the gear part, the structure of the transmission case, etc. On the other hand, the driven gear part is arranged in the middle part of the axle and faces between the axle support members, and the driven gear mechanism and the output drive gear mechanism are arranged above one of the axle support members obliquely in plan view. Since the shaft drive system is crossed and connected, the shaft drive system can be protected by the axle support member from bumps from the road surface when driving on rough terrain, and there is no need to provide a separate protection member for the shaft drive system. Furthermore, since it is driven at the middle part of the axle, it has many advantages such as being favorable in terms of power transmission.

In the embodiment, a fixed type rear axle is shown, but this may be supported by a swing arm (rear fork), and the rear wheel may be of a swinging damping type.

In the embodiment, a tricycle with one front wheel and two rear wheels is shown, but the present invention can also be applied to a tricycle with two front wheels and one rear wheel, or a four-wheel vehicle with two front wheels and two rear wheels.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic side view of a tricycle, Fig. 2 is a perspective view of the frame, Fig. 3 is a side view, and Fig. 4 is a plan view.
FIG. 5 is a cutaway plan view of essential parts of the tricycle, FIG. 6 is an enlarged cross-sectional plan view of the shaft drive system, and FIG. 7 is a longitudinal cross-sectional side view of the same. In the drawings, 1 is a tricycle, 2 is a frame, 5 is a front wheel, 8 is a fuel tank, 9 is an engine, 10 is a seat, 13 is an axle, 18 is an output shaft, A is a driving gear mechanism, B is a driven gear mechanism, 23 is a drive shaft system.

Claims (1)

[Claims] 1. An engine with an output drive gear mechanism mounted on the side is mounted on the main frame consisting of upper and lower pipes.
The main frame is provided with a pair of left and right axle support members that connect and support a front or rear axle of the main frame, and a driven gear mechanism that drives the axle is provided between the pair of left and right axle support members, and the driven gear A shaft drive type small vehicle, characterized in that the mechanism and the output drive gear mechanism are connected by a shaft drive system that intersects obliquely in plan view above one of the axle support members.