JP2012201245A - Electric assist two-wheeled cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric assist two-wheeled cart capable of assisting driving force in response to operation of a worker even in turning.SOLUTION: This electric assist two-wheeled cart 100 can travel by imparting assist force to the driving force input by the worker, and includes a loading space 1 capable of mounting a cargo, a pair of wheels 10 arranged on the right and left of the loading space 1 and supporting the loading space 1, an operation handle 20 extended forward from right-left two places of the loading space 1 and enabling the worker to input the driving force to the loading space 1, a pair of throttle portions 25 installed on the operation handle 20 at a predetermined interval on the right and left, gripped by the worker in operation and operable by the worker, and an assist portion 30 for respectively imparting the assist force to the wheels 10 positioned on the installed side of the throttle parts 25 in response to respective operation quantities of the throttle portions 25.

Description

  The present invention relates to an electric assist rear car whose driving force is assisted by an electric motor.

  In general, a rear car is used to carry a load. When a heavy load is placed on the rear car, a large amount of force is required for transportation, which has been a heavy labor for the operator.

  As a countermeasure, Patent Document 1 proposes an electric rear car in which electric wheels are driven in accordance with the operation of a throttle by an operator. In this electric rear car, when an operator operates a throttle attached to one of the left and right handles, a driving force is applied to the electric wheels so that the electric wheels can move forward and backward.

Japanese Patent Application Laid-Open No. 2011-11637

  However, in the electric rear car described in Patent Document 1, an operator needs to swing the handle left and right when turning. Therefore, when attempting to turn the electric rear car, a large force is required, which may cause heavy labor for the worker.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to obtain an electrically assisted rear car capable of assisting a driving force in response to an operator's operation even when turning.

  The present invention is an electrically assisted rear car capable of traveling with driving force input by an operator and capable of traveling, and is provided with a cargo bed on which luggage can be mounted, and provided on the left and right sides of the cargo bed to support the cargo bed. A pair of wheels, an operation handle that extends forward from two left and right positions of the loading platform, and allows an operator to input driving force to the loading platform, and is attached to the operation handle at a predetermined interval on the left and right, A pair of throttle portions that are sometimes gripped by an operator and can be operated by the operator, and an assisting force is applied to the wheel located on the side where the throttle portion is attached according to the amount of operation of each throttle portion. And an assisting section for imparting each of the above.

  In the present invention, when the operator operates the left and right throttle portions attached to the operation handle with the left and right hands, an assist force corresponding to the operation amount of each throttle portion is applied to the left and right wheels. Thus, the operator can independently adjust the assist forces applied to the left and right wheels by adjusting the operation amounts of the left and right throttle portions. Therefore, the driving force can be assisted according to the operation of the operator even when turning.

1 is a perspective view of an electrically assisted rear car according to an embodiment of the present invention. It is a side view in FIG. It is a front view in FIG. It is a top view in FIG.

  Hereinafter, an electric assist rear car 100 according to an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of the electrically assisted rear car 100 will be described with reference to FIGS. 1 to 4.

  The electric assist rear car 100 is used for transporting a load mounted on the loading platform 1. The electric assist rear car 100 travels with the driving force input from the operation handle 20 by the operator being applied with the assist force due to the rotation of the electric motor 35.

  The electrically assisted rear car 100 is provided with a load carrier 1 on which a load can be loaded, a pair of wheels 10 provided on the left and right sides of the load carrier 1 to support the load carrier 1, and extending forward from two left and right locations of the load carrier 1. An operation handle 20 capable of inputting driving force to the loading platform 1 is provided.

  The loading platform 1 is formed in a box shape by combining a pipe material and a plate material. The loading platform 1 is provided at a rectangular flat surface portion 2 on which a load is loaded, a pair of side wall portions 3 erected upward from left and right end portions of the flat surface portion 2, and front and rear end portions of the flat surface portion 2. And a pair of connecting portions 4 for connecting the left and right side wall portions 3.

  The plane portion 2 is a flat plate that forms the bottom surface of the loading platform 1. A load is directly mounted on the flat portion 2. The flat surface portion 2 is formed by a pair of flat plates 2a and 2b which are provided so that the longitudinal direction thereof is positioned in the front-rear direction and are arranged in parallel to each other. The pair of flat plates 2 a and 2 b abut on each other at the approximate center in the width direction of the loading platform 1. The flat plates 2a and 2b can be folded around the portions that contact each other.

  The side wall part 3 prevents the load mounted on the flat part 2 from falling from the left and right. The side wall portion 3 is formed in a flat plate shape in order to prevent a load mounted on the flat surface portion 2 from being caught in the wheel 10. The side wall portions 3 on the left and right side surfaces can be close to each other in the width direction as the pair of flat plates 2a and 2b in the plane portion 2 are folded.

  The connecting part 4 is fixed to the side wall part 3. The connecting portion 4 regulates the interval between the left and right side wall portions 3. In the state where the connecting portion 4 is attached, the distance between the left and right side wall portions 3 is fixed, and thus the flat surface portion 2 cannot be folded.

  The connection part 4 prevents the load mounted on the flat part 2 from falling from the front and rear. The connection part 4 is removed when the plane part 2 is folded. The connecting portion 4 may be configured to be foldable similarly to the flat portion 2.

  The wheel 10 is provided so as not to be steered in the front-rear direction of the loading platform 1. A pair of wheels 10 are provided on the left and right sides of the loading platform 1 and are rotatably fixed to the side wall portion 3.

  The operation handle 20 includes a handle portion 21 extending in the width direction of the loading platform 1, and a pair of coupling portions 22 that respectively connect both ends of the handling portion 21 and the loading platform 1, and is pulled by an operator. It is a letter-shaped handle. End portions of the left and right connecting portions 22 in the operation handle 20 are connected to the side wall portion 3 in the loading platform 1. As a result, the driving force input by the operator pulling the operation handle 20 is transmitted to the loading platform 1.

  The electrically assisted rear car 100 has a pair of throttle portions 25 attached to the operation handle 20 at a predetermined interval on the left and right sides, and an assist force applied to the wheel 10 in accordance with each operation amount of the throttle portion 25. And an assist unit 30 that is provided to each of the wheels 10 located on the side to which the is attached. The assist unit 30 includes a controller 31 that calculates an assist force according to the rotation angle of the throttle unit 25, and a pair of electric motors 35 that apply the assist force to the wheel 10 according to a command from the controller 31.

  The throttle unit 25 is electrically connected to the controller 31 and outputs an electrical signal corresponding to the amount of operation by the operator to the controller 31. The throttle part 25 is provided so as to be held by an operator during operation and to be operable by the operator.

  The throttle portion 25 is formed in a cylindrical shape through which the handle portion 21 of the operation handle 20 is inserted through the inner periphery. The throttle portion 25 is rotatably attached to the handle portion 21 in the operation handle 20. As a result, when the operator grips the handle portion 21 and pulls the electric assist rear car 100, the throttle portion 25 is naturally gripped.

  When the right throttle unit 25 is operated by the driver, the right electric motor 35 rotates and assist force is applied to the right wheel 10. On the other hand, when the left throttle unit 25 is operated by the driver, the left electric motor 35 rotates and assist force is applied to the left wheel 10.

  The throttle unit 25 outputs an electrical signal corresponding to the rotation angle with respect to the handle unit 21 to the controller 31. As the rotation angle of the throttle unit 25 increases, the magnitude of the assist force applied from the electric motor 35 to the wheel 10 increases.

  The throttle portion 25 is biased toward the origin position by a return spring (not shown). Therefore, when the operator releases his / her hand, the throttle unit 25 returns to the origin position, and the electric motor 35 stops rotating, so that the assist force is not applied to the wheel 10.

  Therefore, when the operator removes his / her hand from the operation handle 20, both the driving force and the assisting force from the electric motor 35 that are pulled by the operator disappear, and the electric assist rear car 100 is stopped. . Thereby, the electric assist rear car 100 does not continue to run against the operator's will.

  When the throttle unit 25 is rotated in the forward direction, the electric motor 35 rotates in the forward direction, and an assist force in a direction for moving the electric assist rear car 100 forward is applied to the wheels 10. On the other hand, when the throttle unit 25 is rotated in the reverse direction, the electric motor 35 rotates in the reverse direction, and the assist force in the direction of moving the electric assist rear car 100 backward is applied to the wheel 10.

  Thus, the electrically assisted rear car 100 can be moved forward and backward by the operation of the throttle unit 25 by the operator. In addition, when the operator makes a difference in the amount of operation of the left and right throttle portions 25, the electric assist rear car 100 can be turned.

  The controller 31 is mounted on the outer peripheral surface of the side wall 3 in the loading platform 1 together with a power supply device and other electronic devices (not shown). The controller 31 controls the electric assist rear car 100 and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an I / O interface (input / output interface). It consists of a microcomputer. The RAM stores data in the processing of the CPU, the ROM stores a control program of the CPU in advance, and the I / O interface is used for input / output of information with the connected device. Control of the electric assist rear car 100 is realized by operating a CPU, RAM, and the like according to a program stored in the ROM.

  The controller 31 performs control to cause the left and right electric motors 35 to generate assist force corresponding to the operation amount of the left and right throttle portions 25, respectively, and moves the electric assist rear car 100 forward or backward, and also assists force to go straight, turn, or bend. Is granted. The controller 31 adjusts the assist force applied from the electric motor 35 to the wheel 10 according to the rotation angle of the throttle unit 25 with respect to the handle unit 21.

  The electric motor 35 is electrically connected to the controller 31 and rotates according to an electrical signal input from the controller 31. The electric motor 35 is an in-wheel motor that is disposed on the inner periphery of the wheel 10 and applies assist force to the wheel 10. In addition, the electric motor 35 may contact the wheel 10 from the outer periphery to apply a driving force.

  Hereinafter, the operation of the electrically assisted rear car 100 will be described.

  First, the case where the electric assist rear car 100 is moved straight forward will be described.

  When the operator rotates the throttle unit 25 in the forward direction by the same amount with both hands, the electrically assisted rear car 100 moves straight forward. At this time, since the electrical signals transmitted from the left and right throttle portions 25 to the controller 31 are the same, the same assist force is applied from the left and right electric motors 35 to the left and right wheels 10. As a result, the electric assist rear car 100 moves straight forward with the assisting force of the electric motor 35 applied to the driving force applied by the operator.

  Note that when the electric assist rear car 100 is moved backward straight, the left and right throttle portions 25 are simply rotated in the reverse direction, and the rest is the same as when moving forward straight.

  Next, the case where the electric assist rear car 100 is turned will be described.

  When the operator makes the operation amounts of the left and right throttle portions 25 different, the electric assist rear car 100 turns left or right. At this time, the assist force applied to the left and right wheels 10 is different between the left and right electric motors 35.

  Specifically, for example, when the electric assist rear car 100 is turned leftward, the operator increases the operation amount for rotating the throttle unit 25 with the right hand compared to the operation amount for rotating the throttle unit 25 with the left hand. That's fine. At this time, the controller 31 commands the assist force applied from the right electric motor 35 to the right wheel 10 to be larger than the assist force applied from the left electric motor 35 to the right wheel 10. As a result, the assist force applied to the right wheel 10 is greater than the assist force applied to the left wheel 10.

  As described above, when the operator operates the left and right throttle portions 25 attached to the operation handle 20 with the left and right hands, an assist force corresponding to the operation amount of each throttle portion 25 is applied to the left and right wheels 10. The Therefore, the operator can independently adjust the assist force applied to the left and right wheels 10 by adjusting the operation amount of the left and right throttle portions 25. Therefore, the driving force can be assisted according to the operation of the operator even when turning.

  The electric assist rear car 100 can move forward and backward depending on whether the operator operates the throttle unit 25 in the forward direction or in the reverse direction.

  The throttle portion 25 is urged toward the origin position by a return spring (not shown), and therefore, when the operator releases his hand from the operation handle 20, the driving force generated by the operator pulling is reduced. Both the assist force from the electric motor 35 is lost. Therefore, the electric assist rear car 100 does not continue to run against the operator's will.

  According to the above embodiment, the following effects are obtained.

  When the operator operates the left and right throttle portions 25 attached to the operation handle 20 with left and right hands, an assist force corresponding to the operation amount of each throttle portion 25 is applied to the left and right wheels 10. Therefore, the operator can independently adjust the assist force applied to the left and right wheels 10 by adjusting the operation amount of the left and right throttle portions 25. Therefore, the driving force can be assisted according to the operation of the operator even when turning.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The electric assist rear car according to the present invention can be used as a rear car for carrying a load.

DESCRIPTION OF SYMBOLS 100 Electric assist rear car 1 Loading platform 10 Wheel 20 Operation handle 21 Handle part 22 Connection part 25 Throttle part 30 Assist part 31 Controller 35 Electric motor

Claims (4)

An electrically assisted rear car capable of traveling with an assist force applied to a driving force input by an operator,
A loading platform capable of carrying luggage,
A pair of wheels provided on the left and right sides of the loading platform to support the loading platform;
An operation handle that extends forward from two left and right sides of the loading platform, and allows an operator to input driving force to the loading platform,
A pair of throttle parts that are attached to the operation handle at a predetermined interval on the left and right, are gripped by an operator during operation, and can be operated by the operator,
An electrically assisted rear car comprising: an assist unit that applies assist force to each of the wheels positioned on a side where the throttle unit is attached according to an operation amount of each throttle unit. The operation handle is formed in a U shape having a handle portion extending in the width direction of the loading platform, and a pair of coupling portions respectively coupling both ends of the handle portion and the loading platform,
The electric assist rear car according to claim 1, wherein the throttle part is attached to the handle part. The throttle portion is formed in a cylindrical shape through which the handle portion of the operation handle is inserted through an inner periphery,
The electric assist rear car according to claim 2, wherein the assist part adjusts an assist force applied to the wheel according to a rotation angle of the throttle part with respect to the handle part. The assist part
A controller for calculating an assist force according to a rotation angle of the throttle unit;
The electric assist rear car according to any one of claims 1 to 3, further comprising: a pair of electric motors that apply assist force to the wheels in response to a command from the controller.

Images