KR102464448B1 - A steering apparatus for an electric-power cart - Google Patents

Abstract

The present invention is a state in which the user boarded in the electric cart (1) provided with a footrest at the rear
The rotational force of the steering wheel (2) in the form of a bar to be manipulated is transmitted through the transmission shaft (3) in the direction of the wheel on the front wheel side.
It relates to a steering device for an electric cart designed to convert
To increase the rotation angle in the helical gear device 22 provided at the bottom of the fragrance column 21,
The output of the motor 31 is controlled in response to the increased rotation angle of the steering column, and the output of the motor is increased through the reduction gear unit 32 connected to the output shaft of the motor 31.
The rotation for changing the direction of the wheel by the steering gear assembly (5) through the transmission shaft (3) is a circle.
By being configured to be active, the steering wheel amplifies the rotational force of the steering wheel, the rotation angle and torque are sensed by the sensor, the output is increased by the motor controlled by the control unit, and the stabil connected to the steering gear assembly through the transmission shaft riser
Since the wheel is rotated through the
As a result, the direction change of the electric cart can be made smoothly even on a narrow back road.
This has the effect of improving the safety and convenience of the user's steering wheel operation.

Description

Steering device for electric cart {A STEERING APPARATUS FOR AN ELECTRIC-POWER CART}

The present invention relates to a steering device for an electric cart, in particular, the rotation radius of the electric cart

Safety by making it small so that it can easily change direction even on a narrow back road

It relates to a steering device for an electric cart having an improved structure to prevent accidents and improve driving convenience.

In general, an electric cart is an improved manual cart that was moved by manpower by loading goods, so that it can be moved by an electric motor to reduce user fatigue and travel longer distances. In order to load goods and transport them to the subsequent process, the user boards and drives them.

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These electric carts are electric vehicles that can be operated on two feet and can run at a speed of up to 8 km/h. According to Article 2 of the Road Traffic Act, 'motorized bicycles (cars with a motor with an engine displacement of less than 50 cc, rated output less than 059 kW)' Because it belongs to the road, you have to drive it, and the steering wheel is in the same bar shape as a bicycle.

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As an example of such an electric cart, Korean Patent Registration No. 10-1640136 (registration date July 11, 2016) includes a chassis part, a body part, a refrigeration part, and a refrigeration control means, and the chassis part forms the skeleton of the electric cart. a frame, a battery installed in the frame to provide power, four wheels, front and rear, left and right, including a driving wheel and a steering wheel, which are suspended in the frame and driven by the power generated by the battery, and power to transmit the power of the battery to the driving wheels It includes a train, a steering system for controlling the traveling direction of the steering wheel but having a steering control unit installed on the rear side of the frame, and a brake system for controlling deceleration or stopping of the driving wheel, wherein the refrigerating unit is mounted on the frame of the chassis and then the body A portion is attached to accommodate a beverage inside, and an upper door is installed to enable upper surface opening, side opening is possible through a side door installed on the side, and a beverage having a refrigerant system that performs internal cooling. An electric cart for refrigeration transport is disclosed.

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However, the conventional electric cart has a bar-shaped steering wheel, and since the steering angle is greatly restricted, the turning radius is increased. The large turning radius for direction change in the city center causes a lot of inconvenience to pedestrians as well as driving inconvenience.

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Korean Patent Registration No. 10-1640136 (Registration Date July 11, 2016)

An object of the present invention is to overcome the limit of the rotation angle of the bar-shaped steering handle by amplifying the rotation angle of the steering wheel to increase the angle change of the wheel in order to solve the problems in the conventional electric cart, thereby to rotate the cart. It is to provide an improved steering device for an electric cart to improve user convenience and safety by reducing the radius.

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In order to achieve the above object, in the steering apparatus for an electric cart according to the present invention, the rotational force of the steering wheel in the form of a bar operated by the user in a state in which the user is riding in the electric cart provided with a footrest at the rear is the front wheel through the electric shaft. In the steering device for an electric cart to change the direction of

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The rotation angle is adjusted from the helical gear device provided at the bottom of the steering column connected to the steering wheel.

to increase, and to reduce the output of the motor in response to the increased rotation angle of the steering column.

will do,

The output of the motor is increased through the reduction gear unit connected to the output shaft of the motor.

The rotation for changing the direction of the wheel by the steering gear assembly is smoothly performed through the coaxial

It is characterized in that it is configured to be lure.

The torque/angle sensor is configured to detect the increased rotation angle and torque of the steering column, and the controller controls the output of the motor in response to the detection signal.

The steering gear assembly is connected to the last intermediate shaft and the upper end of the transmission shaft.

A wheel ball having teeth formed at the lower end of the shaft, and the teeth extending in both directions within the housing

The gear part formed in the central part of the coaxial shaft is engaged with the gear in the clockwise or counterclockwise direction of the shaft.

When the furnace is rotated, the wheel drive shaft moves horizontally to the left and right and rotates to change the direction of the wheel.

configured to do

The wheel drive shaft is connected to the housing by a yoke plug having a support spring inside it.

It is supported horizontally in the jig, and both ends thereof are respectively connected to ball studs provided on the wheel through a stabilizer link.

The steering device for an electric cart according to the present invention amplifies the rotational force of a steering wheel and

The output is increased by the motor controlled by the control unit by sensing the angular angle and torque from the sensor, and the wheel through the stabilizer link connected to the steering gear assembly through the transmission shaft.

As this is rotated, the rotation angle of the wheel is increased and the rotation radius of the electric cart is reduced.

It is possible to smoothly change the direction of the electric cart even on the back road, which has the effect of improving the safety and convenience of the user's steering wheel operation.

1 is a schematic perspective view of an electric cart to which the steering device of the present invention is applied.
Fig. 2 is a schematic perspective view of the steering device of Fig. 1;
3 is an exploded perspective view of the steering apparatus of FIG. 2 ;
4 is a perspective view of the motor of FIG. 3 and a reduction gear assembly for increasing output;
Figure 5 is a schematic enlarged view of the steering gear assembly of Figure 2;

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing embodiments of the present invention.

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1 to 3, the electric cart 1 to which the steering device of the present invention is applied is provided with a refrigeration system to deliver beverages, for example, and a footrest is provided at the rear to operate it while the user is on board The rotational force of the steering wheel 2 is transmitted to the steering gear assembly 5 provided on the front wheel side through the transmission shaft 3 to change the direction of the wheel, and the battery-powered electricity provided on the rear wheel side not shown in the drawing will be driven by a motor.

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This electric cart 1 is designed to run at a low speed of 8 km per hour in accordance with Article 2 of the Road Traffic Act, and the bar-shaped steering wheel 2 has a turning radius as the rotation angle of the wheel is also limited due to the restriction of the rotation angle. There was a problem that it was difficult to change direction on a narrow road because it was large.

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In order to solve this problem, in the present invention, the rotation angle of the steering wheel 2 is increased, for example, to about 1:581 in the helical gear device 22 provided at the lower end of the steering column 21, and is schematically shown in the drawing. The output of the motor 31 is controlled by the control unit 10 according to the signal sensed by the torque/angle sensor 33 of the steering column and the torque, and at this time, the output of the motor through the reduction gear unit 32 This is increased so that the rotation for changing the direction of the wheel by the steering gear assembly 5 through the transmission shaft 3 is smoothly performed, thereby improving the convenience of the driver's manipulation of the steering wheel. Communication between the control unit and the sensor 33 and the motor 31 is through CAN communication.

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The transmission shaft 3 includes an intermediate shaft 34 obliquely connected to the output end of the reduction gear unit 32 by, for example, a universal joint, a middle shaft 35 arranged horizontally by a bracket 4, and a steering gear assembly 5 ) and the intermediate shafts 36 connected to transmit the rotational force of the motor to the steering gear assembly (5).

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The steering gear assembly (5) has teeth formed at the lower end of the shaft (51) connected to the last intermediate shaft (36) and the upper end, and the teeth of the wheel drive shaft (53) extend in both directions within the T-shaped housing (52). ) is engaged with the gear formed in the central portion of the shaft 51, and when the shaft 51 rotates in the clockwise or counterclockwise direction, the wheel drive shaft 53 moves horizontally to the left or right in the drawing to the end of the wheel drive shaft 53. The direction of the cart is changed by rotating a wheel connected to a ball stud 56 mounted on a socket 55 connected to the stabilizer link 54 .

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The wheel drive shaft 53 is horizontally movably supported in the housing 52 by a yoke plug 57 provided therein with a support spring 58 .

It is preferable that bellows 59 are mounted on both sides of the wheel drive shaft 53 to prevent the inflow of foreign substances such as dust to the connection portion with the stabilizer link 54 .

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The steering device for the electric cart shown and described in the drawings is not limited to the electric cart for beverage delivery, and can be used as a steering device for a non-vehicle, and the configuration of the electric shaft 3 is also easily as needed. It will be readily understood by those skilled in the art that it can be changed.

The present invention can be used to safely change direction even in a narrow place by reducing the turning radius in a non-vehicle steering device such as an electric cart for beverage delivery.

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1: Electric cart 2: Steering handle
3: transmission shaft 5: steering gear assembly
10: control unit 21: steering column
22: helical gear device 31: motor
32: reduction gear 33: torque / angle sensor
34,35,36; intermediate axis 51: axis
52: housing 53: wheel drive shaft
54: stabilizer link 55: ball stud
56: support spring 57: yoke plug

Claims (4)

In the electric cart (1) provided with a footrest at the rear, the rotational force of the bar-shaped steering handle (2) operated while the user is on board controls the direction of the wheel on the front wheel side through the steering column (21) and the transmission shaft (3). The output of the motor 31 is controlled by the control unit 10 according to the signal that the torque/angle sensor 33 senses the rotation angle and torque of the steering column so as to be switched, and the output of the motor through the reduction gear unit 32 This is increased so that the rotation for changing the direction of the wheel by the steering gear assembly 5 through the transmission shaft 3 is smoothly made, and the steering gear assembly 5 is connected to the transmission shaft 3 with the shaft ( The teeth are formed at the lower end of the 51), and the teeth are engaged with the gear unit formed in the central part of the wheel drive shaft 53 extending in both directions in the housing 52 in the clockwise or counterclockwise direction of the shaft 51. In the steering device for an electric cart, the wheel drive shaft 53 moves horizontally to the left and right to rotate to change the direction of the wheel when rotating,
The helical gear device 22 provided at the lower end of the steering column 21 connected to the steering handle 2 increases the rotation angle, and the output of the motor 31 is increased in response to the increased rotation angle of the steering column. to be controlled,
The transmission shaft 3 is connected to an intermediate shaft 34 obliquely connected to the output end of the reduction gear unit 32 by a universal joint, an intermediate shaft 35 horizontally arranged by a bracket 4 and a steering gear assembly 5. A steering device for an electric cart, characterized in that it is composed of intermediate shafts (36) to transmit the rotational force of the motor to the steering gear assembly (5).













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