JPH0885352A - Power transmission mechanism for saddle-shaped four-wheel car - Google Patents

Abstract

PURPOSE: To provide a power transmission mechanism for a saddle-shaped four-wheel car which is capable of running more stably, and which can be enjoyed even by short women or children by lowering the gravity center of the vehicle and the height of a vehicle seat. CONSTITUTION: In a power transmission device A for a saddle-shaped four-wheel car in which output shafts 9, 11 relating to an engine 7 axially penetrate a central part of an engine for transmitting power of the output shafts 9, 11 to front and rear propeller shafts 15f, 15r connected to the output shafts 9, 11 through couplings 13f, 13r provided at a front and a rear ends of it, the output shafts 9, 11 are located to be inclined down on their front sides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission mechanism for a saddle type four-wheel vehicle.

[0002]

2. Description of the Related Art There is a four-wheel drive type vehicle called a four-wheeled motorcycle, which is a member of so-called leisure bikes. This four-wheeled motorcycle has the image that it is a completely different vehicle because it is a four-wheeled vehicle but has a handle for the motorcycle.
In addition to being able to run stably with only four wheels, it is equipped with low-pressure balloon tires and equipped with a so-called Ackermann mechanism similar to general four-wheeled vehicles so that the front two wheels can be swung freely, so rough road and You can easily drive through wetlands. However, the vehicle is not always driven by driving all wheels, but is driven by switching between four-wheel drive and two-wheel drive according to the road surface condition. That is, when traveling on rough terrain such as off-road, all wheels are driven as a four-wheel drive vehicle, and on a flat road, only front wheels or rear wheels are driven as a two-wheel drive vehicle.

FIG. 7 shows an example of a conventional four-wheeled motorcycle shown in Japanese Utility Model Laid-Open No. 63-165236, in which propeller shafts c and d are provided on an output shaft b arranged in the vehicle front-rear direction. The front and rear wheels e and f can be driven by connecting and in a substantially straight line.

By the way, since a four-wheeled motorcycle is a leisure motorcycle that normally enjoys off-road traveling, it must be enjoyed by anyone regardless of age or sex. In addition, even a four-wheeled vehicle is a motorcycle, so a rider usually rides on a vehicle seat in the same manner as a two-wheeled vehicle.
Therefore, it is desirable that the center of gravity (usually in the engine part) be lowered as much as possible to enable stable running, and that the height of the vehicle seat be as low as possible so that short women and children can enjoy it. For this reason, it has been desired to provide a technology capable of lowering the center of gravity of the vehicle and further lowering the vehicle seat.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the problem to be solved is to lower the vehicle center of gravity and the height of the vehicle seat as compared with the prior art. Another object of the present invention is to provide a power transmission mechanism for a saddle-shaped four-wheeled vehicle that enables more stable running and can be enjoyed by short women and children.

[0006]

The power transmission mechanism for a saddle-type four-wheel vehicle according to the present invention solves the above problems and is as follows. That is, according to the present invention, the output shaft of the engine penetrates the center of the engine in the front-rear direction and transmits the power of the output shaft to the front and rear propeller shafts connected to the output shaft via joints provided at the front and rear ends thereof. A power transmission device for a saddle-shaped four-wheel vehicle, characterized in that the output shaft is arranged in a front-down direction.

[0007]

Therefore, according to the power transmission mechanism of the saddle-type four-wheel vehicle of the present invention, since the output shaft is arranged in the front lower direction, the engine is also lowered in the front direction, so that the center of gravity can be lowered.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power transmission mechanism A for a saddle-shaped four-wheel vehicle according to the present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view of a saddle-type four-wheel vehicle in which a power transmission mechanism for a saddle-type four-wheel vehicle according to the present invention is adopted, FIG. 2 is a schematic side view thereof, FIG. 3 is a plan view of FIG. Is the front view of FIG.
5 is an enlarged view of a main part of FIG. 2, and FIG. 6 is a plan view of FIG.

Balloon tires 2, 2, 3 and 3 for running on rough terrain with low air pressure are mounted on the front and rear wheels of a four-wheeled motorcycle 1 as a saddle-type four-wheeled vehicle. Further, the direction change of the saddle type four-wheeled vehicle 1 is performed by the bar handle 4, and when the bar handle 4 is operated, the front wheel is driven by a wheel manipulating mechanism (for example, Ackermann mechanism) not shown arranged inside the vehicle body 5. Balloon tires 2.2 are operated and the direction is changed.

An engine 7 is mounted in the center of a vehicle body frame 6 of the vehicle body 5. The engine 7 is attached to the vehicle body frame 6 so as to be arranged substantially in the center between the front and rear wheels, and is arranged so that the mating surface of the left and right split crankcases 61 and 6r is included in the median plane S. . In addition, as shown in FIGS. 5 and 6, the engine 7 includes a first output shaft 9 for driving front wheels and a second output shaft 11 for driving rear wheels, which are arranged on the same axis line and penetrate through the center of the lower portion in the front-rear direction. And they are respectively connected to universal joints 13f and 13r as joints.

The universal joint 13f has a shaft drive mechanism 17 having a propeller shaft 15f.
Are connected to the front deceleration unit 16f via the above, and the balloon tires 2, 2 of the front wheels are rotated via these. Further, the universal joint 13r is connected to the rear reduction unit 16r via a shaft drive mechanism 18 having a propeller shaft 15r and the like, and the rear wheel balloon tires 3 and 3 are connected via these.
Is rotated.

Further, the first output shaft 9 and the second output shaft 11
As shown in FIG. 2 and FIG. 5, the propeller shaft 15f, which is lowered downwards and is connected to the first output shaft 9 via the universal joint 13f, is attached in a forwardly inclined state. And the second output shaft 1
The propeller shaft 15r, which is connected to 1 via a universal joint 13r, is attached in a rearward and downward inclined state.

Therefore, the power of the engine 7 is transmitted to the first and second output shafts 9 and 11, and further, via the respective shaft drive mechanisms 17 and 18 and the front and rear speed reduction units 16f and 16r which are connected to these. It is transmitted to the balloon tires 2, 2, 3 and 3, and the four wheels are selectively driven at the same time or one of them depending on the road surface condition.

Reference numeral 20 indicates a vehicle seat, which is located above the engine 7. The rider rides on the vehicle seat 20 in a saddle-like manner, as in the case of riding an ordinary motorcycle.

However, in a saddle-shaped four-wheeled vehicle in which the power transmission mechanism for the saddle-shaped four-wheeled vehicle configured as described above is adopted, the first output shaft 9 and the second output shaft 11 are placed in front. Since it is arranged on the lower side, the engine 7 also moves forward. For this reason,
Since the center of gravity can be lowered, the height of the vehicle seat 20 can be lowered. Therefore, more stable running is possible, and even short women and children can enjoy it.

[0016]

According to the present invention, by lowering the center of gravity of the vehicle and the height of the vehicle seat, more stable running is possible, and even short women and children can enjoy it as a leisure bike.

[Brief description of drawings]

FIG. 1 is a perspective view of a saddle-type four-wheel vehicle in which a power transmission mechanism for a saddle-type four-wheel vehicle according to the present invention is adopted.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a front view of FIG.

5 is an enlarged view of a main part of FIG.

FIG. 6 is a plan view of FIG.

FIG. 7 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 7 Engine 9 Output shaft 11 Output shaft 13f Joint 13r Joint 15f Propeller shaft 15r Propeller shaft A Power transmission mechanism for saddle type four-wheel vehicle

Claims (1)

[Claims] 1. A saddle for transmitting power of an output shaft of an engine to a front and rear propeller shafts which penetrate the center of the engine in the front-rear direction and are connected to the output shaft through joints provided at front and rear ends thereof. A power transmission device for a saddle-shaped four-wheel vehicle, wherein the output shaft is arranged in a front-down direction.