JPS62283085A - Uneven-ground travelling saddling type car - 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] 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention provides a system in which a balloon tire is attached to each of three or four wheels, and the balloon tire is mounted approximately in the center of the vehicle body. The present invention relates to a straddle-type vehicle that drives the rear two wheels with a built-in engine and travels on rough terrain.

(Prior Art) Conventional engines installed in saddle-type vehicles have been mainly single-cylinder engines, which are advantageous in terms of weight, for the purpose of driving on rough terrain. However, in order to further improve the vehicle's pitching power and driving performance, it was necessary to increase the displacement of the engine and the number of cylinders.

(Problems to be Solved by the Invention) As mentioned above, increasing the displacement of the engine to improve performance increases the size of the cylinder, and the larger the cylinder, the higher the center of gravity, and the higher the center of gravity, the worse running stability becomes. Increasing the engine displacement to such an extent has various disadvantages, so in the past, the center of gravity was raised,
The tread width of the front or rear wheels was set to the optimal width, but if the tread width was unnecessarily widened, other problems would occur, such as making it difficult to turn around easily or maneuvering in narrow spaces. Delicate design was required in terms of size, tread width, and vehicle handling.

Furthermore, in order to prevent the engine center of gravity from becoming too high, it was considered to increase the number of engine cylinders, but simply increasing the number of cylinders in parallel would shift the center of gravity to either the front or the rear, causing the vehicle to There were drawbacks such as poor balance in the front-rear direction.

The present invention has been made in consideration of the above-mentioned circumstances, and although it is possible to improve driving performance by increasing the number of cylinders, it also improves the longitudinal balance of the vehicle and improves driving performance. An object of the present invention is to provide a saddle riding type vehicle for traveling on rough terrain with increased safety.

[Structure of the invention]

(Means for Solving the Problems) The present invention is an invention for the center of gravity and balance of the above-mentioned vehicle, in which balloon tires are mounted on each of the front and rear wheels, and an engine mounted approximately in the center of the vehicle body is used to control uneven terrain. In a traveling straddle-type vehicle, the engine has at least two cylinders at the front and rear with respect to the direction of travel of the vehicle, and the front and rear cylinders are arranged such that the axis of the footrest protrudes from the vehicle body in a direction perpendicular to the direction of travel of the vehicle. They are placed in front and behind each other.

(Function) The engine installed in the uneven terrain riding type vehicle of the present invention has the following features:
The front cylinder is located forward of the footless 1-axis center, and the rear cylinder is located behind the coaxial center, so the center of gravity of the engine is concentrated in the center of the vehicle (centralization of mass), and the height of the center of gravity is also the same for the exhaust. It can be lowered by using a multi-cylinder engine.

(Example) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Figure 1 is a side view of a straddle-type four-wheeled vehicle for traveling on rough terrain, where reference numeral 1 indicates the vehicle body, and front wheels 2, 2 and rear wheels 3, 3 each equipped with balloon tires are attached to the front and rear of the vehicle body 1. It is being Reference numeral 4 indicates a bar-shaped handle for steering the front wheels 2.degree. 2, and a seat 5 is placed vertically at the rear from the approximate center of the vehicle body.

Then, vehicle advancing force=
3 - A footrest 6 is provided to protrude in a direction perpendicular to the direction F.

Further, reference numeral 7 is the engine main body, and in this embodiment, the second
As you can see from the plan view in the figure, the so-called parallel 4
Front two cylinders tilted forward in the direction of vehicle travel 8.8
It consists of two rear cylinders 9.9 inclining to the rear. The front cylinder 8.8 and the rear cylinders 9, 9 are arranged in front and behind the axes F and C of the footless footless 6. It should be noted that if the dimensions A and B between the axes F and C of the footrest 6 and the highest pounds of the front and rear cylinders are made large, the center of gravity will be moved to the front side, and the floating of the front wheels can be suppressed as much as possible.

In addition, the code|symbol 10 is a carburetor, and the code|symbols 11a-11d show each exhaust pipe.

3(A) to 3(C) show examples of Haku, and FIG.
) is a 3-cylinder engine, (B) is a 2-cylinder engine, and (B) is a 2-cylinder engine.
C) shows the relationship between the conceptual diagram of each cylinder of an engine with four or more cylinders and the axes F and C of the footrest. However, in both cases, each cylinder is arranged such that at least the front and rear cylinders are located front and rear across the axes F and C of the footrest that protrudes from the vehicle body in a direction perpendicular to the vehicle traveling direction F. It is.

〔Effect of the invention〕

As described above, the present invention provides a straddle-type vehicle which is equipped with balloon tires on each of the front and rear wheels and which travels on rough terrain with an engine mounted substantially in the center of the vehicle body, in which the cylinders of the engine are at least There are two cylinders in the front and rear, and the front and rear cylinders are located front and rear across the axis of the footrest, which protrudes from the vehicle body in a direction perpendicular to the direction of vehicle travel, so that the engine displacement can be adjusted to improve driving performance. By increasing the number of cylinders, it is possible to make the engine more compact than in the case of a single cylinder, and this also makes it possible to lower the seat height. By lowering the center of gravity in this manner, the tread widths of the front and rear wheels do not have to be widened, making it easier to turn around and handle the vehicle. Furthermore, by arranging the front and rear cylinders across the axis of the footrest, engine weight is reduced.

[Brief explanation of drawings]

FIG. 1 is an overall side view showing an embodiment of a straddle-type vehicle according to the present invention, FIG. 2 is a plan view of the engine section of FIG. 1, and FIG. 3 is a conceptual diagram showing another embodiment of the present invention. (A> indicates a 3-cylinder engine, (B) indicates a 2-cylinder engine, and (C) indicates an engine with 4 or more cylinders. 1...Vehicle body, 2.2...Front wheels, 3,3... Rear wheel,
6...Footrest, 8,8...Front cylinder, 9,9
...Rear cylinder, Fl...Footrest axis, F...
・Vehicle direction of travel.

Claims (1)

[Claims] In a straddle-type vehicle that is equipped with balloon tires on each of the front and rear wheels and that travels on rough terrain with an engine mounted approximately in the center of the vehicle body, the engine has at least two cylinders in the front and rear in the direction of travel of the vehicle, and The above-mentioned front and rear cylinders are arranged front and rear across the axis of a footrest protruding from the vehicle body in a direction perpendicular to the vehicle traveling direction.