JP2009208527A - Movement direction free electric driving truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movement direction free electric driving truck capable of directly performing movement in an arbitrary direction without repeating advancement/retreating at a narrow place. <P>SOLUTION: The truck is constituted, which is provided with a pair of driving wheels for determining a movement direction of the vehicle and moving the vehicle other than the wheels for supporting weight of the truck including a loaded article and can be freely moved in the arbitrary direction. A pair of driving wheels are attached to both sides of a drive axle crossed and fixed to a lower part of a rotatable vertical shaft retained to a central part of a vehicle base, the driving wheels are driven by two pairs of drivers and motors using electric power of an on-vehicle secondary battery, and two drivers are coordinated/controlled making a drive instruction signal as reference. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

    A pair of drive wheels mounted on both ends of a drive axle that can rotate in a horizontal plane around a vertical axis with a downward force applied to the center of a carriage supported by a universal caster, but using a separate driver and motor The present invention relates to a technology that gives a function of moving in any direction by driving uniformly according to a command signal.

  At present, the traveling direction of a vehicle such as an automobile is mainly changed by changing the support direction of the front wheels by a lever or the like. The direction of the rear wheel is fixed.

    For this reason, to change the traveling direction of the vehicle, it is necessary to move forward or backward by a certain distance.

    Moving the position to the side requires repeated forward and backward movements.

    A large reaction force works to change the direction of the front wheels.

    Such inconvenience is due to the fact that the four wheels that support the weight of the car are shared with the function of transmitting power and changing direction.

There are currently no cars with independent drive wheels other than the weight support wheels.
Special table 2002-512152

    Provided is an electric drive carriage that can be moved directly in any direction of front, rear, left, and right.

  This electric trolley is not intended for long-distance transportation, but should provide a means of transportation that can be easily turned on the premises or indoors, a quick movement of the position, and a means of following.

    As shown in FIG. 1, a holding sleeve (6) is provided at the center of the lower surface of a carriage (1) having four universal casters (2) for supporting weight, and the vertical shaft (3) is held so that it can rotate and move up and down. .

    A drive wheel (5) and a timing pulley (8) connected by a drive sleeve (7) on the left and right sides of a drive axle (4) fixed orthogonally as shown in FIG. 1 below the vertical shaft (3). Wear each one.

    The vertical shaft (3) is pushed down via the spring (12) and presses the drive wheel (5) against the floor surface. The pressing force by the spring should be adjustable according to the load.

    Two motors (10) driven by individual drivers using an in-vehicle secondary battery as a power source are independently rotated through a timing belt (11) and a timing pulley (8) as shown in FIG. To the drive wheel (5).

    The timing belt and timing pulley may be replaced with a plurality of v-belts and multi-row v-pulleys as necessary.

  In addition to the wheels that support the weight of the load and the carriage, the function of directly moving the carriage in any direction by providing a drive-only wheel is a major change in the concept of a conventional automobile.

  By rotating the two drive wheels (5) on the left and right sides of the drive shaft at the same speed in the same direction, the carriage moves in one direction of the horizontal perpendicular to the drive axle (3) without changing the direction, and so on in the opposite direction. It moves in the opposite direction by rotating at high speed.

    By rotating the left and right drive wheels (5) at the same speed in opposite directions, the drive axle (4) rotates about the vertical axis (3) to change the moving direction of the carriage. At this time, the direction of the carriage does not change.

    If the rotation of the vertical axis (3) is prevented and the same operation as described above is performed, the direction of the carriage and the moving direction change simultaneously.

    There is no reaction force against the turning of the drive axle caused by rotating the two drive wheels counterclockwise. That is, the moving direction can be changed very easily.

    If the two drive wheels are rotated in the same direction at a non-constant speed, the carriage moves along an arc in contact with the horizontal perpendicular of the drive shaft (4).

    The motor suitable for driving the carriage is a brushless DC motor, and has a characteristic that the speed can be varied in a wide range with a constant rotational force, and there is no need to provide a reduction ratio switching clutch.

    Since a DC motor with a deceleration gear is used, it has a high resistance to external force, and a lightweight cart does not require a mechanical braking device and the structure is simple.

    The drive shaft, drive wheel, and rotation transmission mechanism of the motor may basically be as described above, but measures for maintaining strength, durability, reducing friction, and the like are desired.

    In addition to the load, a shock absorber that prevents vibrations due to road surface changes from being directly transmitted to loading devices such as motors and drivers would be necessary.

    The ease and smoothness of operation are governed by the flexibility of the driver circuit and the automatic balancing circuit that connects the two motor driver input circuits to the traveling direction and the traveling operation instruction circuit. Research and enhancement of acceleration, deceleration and other control methods and circuits are desired.

    A battery charger for the secondary battery is also mounted on the carriage so that it can be charged with an AC power source as needed.

    This electric drive bogie is newly conceived and there is no embodiment at present.

    It is expected to be used as a small-tracking robot, a delivery robot, and an electric drive vehicle for delivery.

    Use of the two electric drive carts is convenient for transporting long materials. A transport vehicle equipped with two sets of drive units on one long cart will also be useful for transporting long objects. This can be considered as a solution to the difficulty of changing the direction of travel in a long trailer track. Of course, the structure and function of the drive carriage need to be modified to meet the purpose.

    If this trolley is equipped with a thin armchair with a footrest, the sick and disabled will be able to leave the bed and enjoy their free lives, and also be a convenient care product that can be moved to the restroom, dining room and so on.

It is front center sectional drawing of this electric drive vehicle. It is a top view of this electric drive vehicle written on the assumption that the trolley was transparent.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carriage 2 Caster 3 Vertical axis 4 Drive axle 5 Drive wheel 6 Holding sleeve 7 Drive sleeve 8 Timing pulley 9 Motor support base 10 Motor 11 Timing belt 12 Spring

Claims (1)

A pair of drive wheels attached to both ends of a drive axle that can rotate in a horizontal plane around a vertical axis with a downward force applied to the center of a carriage supported by a universal caster, powered by an in-vehicle secondary battery This is a freely moving electric drive cart that uses a driver and motor to drive in a unified manner according to the operation command signal.