JPH0723333Y2 - Six-wheel drive vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a six-wheel drive vehicle, and more particularly to a six-wheel drive vehicle capable of turning on a spot even in a narrow space.

(Prior Art) Conventional six-wheel drive vehicles such as large buses and trucks are driven by the rear wheels and steered by the front wheels. in this case,
Each of the rear wheels that exert a driving force is arranged on the axle so that the driving direction thereof is parallel to the longitudinal direction of the vehicle body.

(Problems to be Solved by the Invention) Due to the structure as described above, the conventional six-wheel drive vehicle cannot perform a sharp turning motion in a small turn, and its turning radius becomes large. Therefore, a large space is required for the turning movement.

An object of the present invention is to solve such a problem and to provide a six-wheel drive vehicle capable of turning on the spot.

(Means for Solving the Problems) In order to achieve the above object, a six-wheel drive vehicle of the present invention comprises a pair of left and right front wheels, a middle wheel and a rear wheel, which are sequentially installed in a longitudinal direction of a vehicle body, and the front wheel or the rear wheel. In a state where the wheel levitation means is provided so that the wheel can be lifted from the grounding point and the front wheel or the rear wheel is lifted by the wheel levitation means, four wheels other than the lifted wheel are mutually in plan view. An actuator provided to steer the four wheels in a form of a parallelogram, and a state in which the wheel levitation means lifts the front wheel or the rear wheel. And a drive mechanism provided so as to rotationally drive only the wheels located on one of the left and right sides.

(Operation) When changing the direction of a 6-wheel drive vehicle, first lift the front wheel or rear wheel from the ground contact point. As a result, the vehicle body is supported by the middle wheel and the other wheels, that is, four wheels in total. Then these 4
The actuators independently arranged on the two wheels are operated to arrange the four wheels so that they are parallelogram sides when viewed from the lower part of the vehicle body. Then, only one of the middle wheels drives and the other three
By making the wheels freely rotate, the direction of the vehicle body can be changed with a point equidistant from the center of the four wheels arranged as the center of turning.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a conceptual side view when the six-wheel drive vehicle of the present invention enters a turning motion, FIG. 2 is a conceptual perspective view showing an arrangement state of each wheel during the turning motion, and FIG. 3 is a vehicle body during the turning motion. FIG. 3 is a plan view of the vehicle as viewed from below the vehicle body.

In these figures, a front wheel 2, a middle wheel 3 and a rear wheel 4 each composed of a pair of wheels are arranged on a vehicle body 1 at equal intervals. A transmission 5 is arranged in the longitudinal direction of the vehicle body at the center of the lower portion of the vehicle body 1, and power is formed from the three positions 5a, 5b, 5c of the transmission to the respective wheels 2a, 2b and the middle wheel 3 which form the front wheel 2. It is distributed to each wheel 3a, 3b and each wheel 4a, 4b that constitutes the rear wheel 4. In this case, power is transmitted from the power distribution positions 5a, 5b, 5c to the wheels 2b, 3b, 4b via the clutch mechanisms 5'a, 5'b, 5'c.

Wheels 2a, 2b, 3a, 3b, 4a, 4b and axles 6a, 6b, 6c, 6d,
6e and 6f are universal joints, and each vehicle has its joints 2'a, 2'b, 3 '.
a, 3'b, 4'a, 4'b, each axle
It is possible to freely tilt with respect to 6a, 6b, 6c, 6d, 6e, 6f.

The actuators 7a, 7b,
7c, 7d, 7e, 7f are provided, and by expanding and contracting these actuators, each wheel can be tilted at any angle with respect to each axle around the joint with the axle.

The front wheel 2 can be lifted as a whole from the ground contact point by the hydraulic mechanism 8 arranged on the vehicle body 1, for example.

Next, the operation will be described.

When the six-wheel drive vehicle of the present invention reaches the edge of a cliff as shown in FIG.
From the ground point. After that, the remaining middle wheels 3 and rear wheels 4
The actuators 7c, 7d, 7e, 7f independently arranged on the respective wheels 3a, 3b, 4a, 4b are operated to move the respective wheels from the positional relationship shown by the phantom line in FIG. The two are arranged in such a positional relationship that they are inclined to each other and form a parallelogram as a whole. Then, by disengaging the clutches 5'b and 5'c to bring the wheels 3b and 4b into a freely rotating state and transmitting the engine power only to the wheel 3a of the middle wheel 3 or the wheel 4a of the rear wheel 4, the vehicle body It makes a circular motion about points equidistant from the four wheels 3a, 3b, 4a, 4b. That is, the vehicle body turns on the spot.

It should be noted that the present invention is not limited to the structure in which the front wheel 2 is lifted from the ground contact point, but the rear wheel 4 can be lifted and the front wheel 2 can be in contact with the middle wheel 3 as well. In this case, the problem of the position of the center of gravity of the vehicle body can be solved by moving the wheel of the middle wheel to the ground contact point with the ground outside the above-described turning center when steering each wheel. Further, the driving force at the time of turning is not limited to being supplied from the two wheels 3a and 4a, and may be a form supplied from one of the middle wheel 3a and one of the rear wheels 4a. . However, in that case, the other wheels need to be in a state where they can rotate freely.

(Effect of the Invention) As is clear from the above description, the six-wheel drive vehicle of the present invention is
A pair of left and right front wheels, a middle wheel, and a rear wheel that are sequentially installed in the longitudinal direction of the vehicle body, a wheel levitation unit that is capable of lifting the front wheel or the rear wheel from a ground point, and the wheel levitation unit is the front wheel or the An actuator provided to steer the four wheels in a form in which four wheels other than the lifted wheels form sides of parallelograms with respect to each other in a plan view in a state where the rear wheels are lifted up; And a drive mechanism provided to rotate only one of the four wheels located on the left or right side while the front wheel or the rear wheel is floating. Therefore, by arranging the four wheels of the middle wheel and the rear wheel (or the front wheel) that are in contact with each other in a parallelogram,
The turning operation can be performed on the spot.

[Brief description of drawings]

FIG. 1 is a conceptual side view of an embodiment of the present invention, FIG. 2 is a conceptual perspective view showing the positional relationship of each wheel during turning, and FIG. 3 is a plan view of the state of FIG. Is. 1 ... Car body, 2 ... Front wheel, 3 ... Middle wheel, 4 ... Rear wheel, 2
a, 2b, 3a, 3b, 4a, 4b ... wheels, 2'a, 2'b, 3'a, 3'b, 4 '
a, 4'b ... Joint part, 5 ... transmission, 5a, 5b, 5c ... position, 5'a, 5'b, 5'c ... clutch, 6a, 6b, 6c, 6d, 6e, 6f ...... Axle, 7a, 7b, 7c, 7d, 7e, 7f
…… Actuator, 8 …… Hydraulic mechanism.

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right front wheels, a middle wheel, and a rear wheel, which are sequentially installed in a longitudinal direction of a vehicle body, wheel levitation means capable of lifting the front wheel or the rear wheel from a ground point, and the wheel levitation. Provided to steer the four wheels such that the four wheels other than the lifted wheels form parallelogram sides with each other in plan view while the means lifts the front wheels or the rear wheels. An actuator, and a drive mechanism provided to rotationally drive only one of the four wheels located on the left or right side of the four wheels in a state where the wheel levitation means floats the front wheel or the rear wheel, A six-wheel drive vehicle characterized by being equipped with.