JPS61261176A - Four-wheel barrow for travelling on wasteland - 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] [Technical Field of the Invention] The present invention relates to a four-wheeled vehicle for running on rough terrain equipped with low-pressure tires or balloon tires, and can be mounted on a power unit used in a motorcycle with minimal changes. Concerning the composition of Toshikosha's body style.

[Conventional technology]

Conventionally, small three- or four-wheeled vehicles equipped with a rider-style seat and stick-shaped steering wheels are equipped with low-pressure tires or tires called balloon tires that can be used at a low air pressure of 1/- or less. known (for example, JP-A-59
-106787).

By the way, these caged vehicles generally have almost the same engine body and transmission gear mechanism as those used in motorcycles.
Many cases are reused and only the case or part of the case is made new. Therefore, the power unit has a vertical engine and a gear transmission connected to the side of the crankcase in an abbreviated shape similar to a motorcycle, and the crankshaft is connected in the left-right direction of the vehicle. The vehicle is mounted so that it faces toward the vehicle, and the running wheels are driven via a chain.

On the other hand, in order to improve the ability of such vehicles to travel on rough roads, it is required to use a drive shaft instead of a chain. For this purpose, it is preferable to mount the power unit on the vehicle with the crankshaft facing forward and backward to reduce the use of a bevel gear mechanism. It is not suitable for such use because it has a substantially backbone shape used in automatic tricycles for traveling on rough terrain operated by.

[Objective and Summary of the Invention] The present invention provides a four-wheeled vehicle for traveling on rough terrain using a power unit having the same main parts as that for the aforementioned two-wheeled motor vehicle, and improving the mountability of the power unit. This is a power unit that consists of a vertical engine and a transmission housed in an integrated case adjacent to its crank chamber, and two lower members on the left and right that extend in the front-rear direction. The engine is comprised of an upper member and a connecting member arranged in a substantially triangular shape that connects them, and is characterized in that the crankshaft of the engine is mounted in the center of the vehicle body frame with the crankshaft of the engine facing in the direction of travel of the vehicle.

〔Example〕

This invention will be explained with reference to the following example. A four-wheeled vehicle for traveling on rough terrain according to this example has a body frame 1 assembled by welding tubes made of steel or steel alloy.

The vehicle body frame 1 has two lower members 1a on the left and right that extend in the front-rear direction,
1a, one upper member 1b, and a substantially triangular connecting member 1C that connects them are welded together for assembly.

The front part of the vehicle body frame 1 is formed into a quadrangular pyramid shape by welding four auxiliary frames 1d and 1dt to the front end of the lower member 1a, and the top part of the four auxiliary frames 1d and 1dt is welded to the front end of the upper member 1b. At the rear of the vehicle body frame 1, the rear end of the upper member 1b is bent upward, opened rearward, and welded to the U-shaped seat frame 1e.
e directly by the two lower members 1a, 1a at the rear,
The front portions are indirectly supported via two vertical frames 1 f, 1 f.

Reference numeral 2 denotes a bifurcated swinging arm pivotally supported to the rear of the vehicle body frame 1 so as to be able to swing vertically; one of the swinging arms 2 has a rear wheel drive box 2a containing a gear mechanism at the rear end; This itself also forms a case for the propulsion shaft 2c, which will be described later. 2d is a rear axle, and rear wheels 2e are located at both ends of the rear axle.

2e is screwed on.

At the center of the vehicle body frame 1, struts 3a and 3b for a fuel tank 3 are erected at two locations, front and rear, from an upper member 1b, and the fuel tank 3 is removably fixed to a pole 3c. Further, bearings 4a and 4b of the steering shaft 4 are fixed to the upper end of the front strut 3a and the upper member 3b, respectively. 4C is steering axis 4
The seat 5 is in the shape of a rider similar to that of a motorcycle.

6 is a power unit suspended in the center of the vehicle body frame 1, and three brackets 1 are fixed to the upper member 1b and the lower members 1a and 1m by welding or bolting.
It is bolted to the free end of g. The power unit 6 houses a vertical engine 7 and a transmission 8 in an integrated case. As shown in FIG. 4, the vertical engine 7 is
It consists of an upper combustion chamber member 7a and a lower crank chamber member 7b, and the combustion chamber member 7a includes a cylinder, a cylinder head,
It is composed of known engine parts such as a piston and a connecting rod, and a crankshaft 9 is pivotally supported in the crank chamber member 7b. The transmission 8 includes an input shaft 8a, an output shaft 8b, and a gear group 8C provided between them. That's how it is.

The combustion chamber member 7a protrudes upward from the crank chamber member rb, and the Mayu transmission 8 protrudes laterally, and the power unit 6 itself has an approximately oval lateral shape as a whole.
A carburetor is connected to the combustion chamber member 7a, and an air cleaner 12 is installed across the upper member 1b. In order to avoid interference with the combustion chamber member 7a of the power unit 6, the body frame 1 has a part F of the upper member 1b bent to the right in FIG. 7
can be accommodated on the bottom surface of the combustion tank 3.

To mount this power unit 6 on the vehicle body frame 1.

Hold the vehicle body frame 1 horizontally, lift the power unit 6 with a crane or chain block, and move it horizontally from the side of the vehicle body frame 1 in the same position as the state, and install the power unit 6 and the bracket 1g. This is done by aligning holes (not shown) and inserting bolts. However, since the lower member 1a and the upper member 1b constituting the vehicle body frame 1 are arranged in a substantially triangular shape, when adjusting the bolt positions of the power unit 6 and the bracket 1g, the power unit 6 is temporarily attached to the lower member 1a. It is also possible to place the machine on top of the machine, which is convenient for loading and unloading for maintenance in places where there are no facilities such as the above-mentioned crane or chain hoist. In addition, from engine maintenance, fuel tank 3
It is preferable that it be constructed so that it can be easily attached and detached.

15 is a companion front wheel drive box suspended at the front part of the vehicle body frame 1;
It is connected to the power unit 6 via the propulsion shaft 16, and is connected to the left and right front wheels 15b via the left and right axles 15a, 15a.
is connected to.

Next, the power transmission system from the engine T to the front and rear wheels will be explained in detail. The crankshaft 9 is connected to the input shaft 8a and output shaft 8b via a manual clutch 8d installed on the input shaft 8a of a transmission 80 via a centrifugal clutch 9a and a reduction gear train 9b.
and drives a transmission gear group 8C provided between the two. The other end of the output shaft 8b projects outward from the case of the power unit 6 and is connected to the propulsion shaft 16.

The output shaft 8b is further connected to the rear wheel propulsion shafts 2b, 2c via an auxiliary transmission 18. The auxiliary transmission 18 has an intermediate shaft 18a and an output shaft 18b, and between the output shaft 8b and the output shaft 8b, an auxiliary gear train that switches between high and low speeds and a gear mechanism that switches between forward and backward movements are constructed.

〔Effect of the invention〕

The four-wheeled vehicle for traveling on rough terrain according to the present invention has a vertical structure y-)y.
7h%OI5 yj@VC″11″182) is housed in an integrated case, and the power unit 6t is arranged in an approximately triangular shape, with the crankshaft oriented in the direction of vehicle travel in the center of the nine-body frame. Since it can be easily mounted on a motorcycle, it is easy to adopt a configuration in which the front and rear wheels are driven by the shaft using the power unit of a conventional motorcycle. Further, when mounting the power unit on the vehicle body frame 1, the crankshaft 9 of the engine is directed in the traveling direction of the vehicle, and the ratio transmission 8 is protruded to the side.
Since the engine is passed under the upper member 1b and supported by the lower member 1a on the other side via the bracket 1g, it is easy to assemble it into the vehicle body frame 2, even though the engine itself has an approximately rectangular side shape. However, it has the advantage of providing a relatively lightweight and highly rigid body frame structure.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a four-wheeled vehicle for traveling on rough terrain, FIG. 2 is a plan view with its main parts cut away, FIG. FIG. 4 is an enlarged view of the main parts thereof, and FIG. 5 is a plan view showing the vehicle body frame. 1a...Lower member, 1b...Upper member. 3... Fuel tank, 3a, 3b... Support. 6...power unit, 7...engine, 8...
··transmission.

Claims (4)

[Claims] (1) A power unit consisting of a vertical engine and a transmission adjacent to its crank chamber housed in an integrated case includes two lower members on the left and right extending in the front and rear direction, one upper member, and A four-wheel vehicle for traveling on rough terrain, in which the crankshaft of the engine is mounted in the center of a body frame configured with connecting members arranged in a substantially triangular shape, with the crankshaft of the engine facing in the traveling direction of the vehicle. (2) A vertical engine consists of a combustion chamber member and a crank chamber member, and the combustion chamber member extends upward from the crank chamber, and
The four-wheeled vehicle for traveling on rough terrain according to claim 1, wherein the transmissions project laterally, and the power unit itself has a substantially L-shape when viewed from the side. (3) The four-wheeled vehicle for traveling on rough terrain according to claim 1, wherein the lower member, the upper member, and the connecting member connecting them are constructed by welding and assembling steel pipes. (4) The four wheels for running on rough terrain according to claim 1, wherein the vertical engine includes a combustion chamber member disposed on one side of the upper member and a carburetor and an air cleaner disposed on the other side. car.