JP2007290519A - Axle rotational force amplifying device of hand truck constituting force detection (torque sensing) and electric-driven assist by one component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a truck capable of conveying a heavy load in a feeling of loading and conveying a light luggage by a hand truck by human power at site. <P>SOLUTION: The truck for conveying a heavy load in a feeling of loading and conveying a light luggage on a hand truck by human power by amplifying the truck pushing force of an operator without any sense of incongruity is invented. The truck is equipped with an axle rotational force amplifier for the hand truck while the force detection (the torque sensing) and the electric-driven assist are constituted by one component. The force detection (the torque sensing) is calculated not by a sensor but by the induced current of the generator function. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an axle rotational force amplifying device for a handcart, in which force detection (torque sensing) and electric assist are configured as a single component.

  A high-performance small rechargeable battery widely used in electric-assisted bicycles such as electric-assist bicycles and lithium-ion batteries.

In general, when operating a hand-powered electric cart, the lever moves forward and backward with a simple structure.In a complex structure, the speed of the cart driven by the force applied by a person is measured with a biaxial acceleration sensor, and the built-in computer After calculating the force applied by the person in the system, a system that compensates for the shortage is equipped with a system that calculates the force applied by the person from the speed of the trolley or wheelchair, as well as a force sensor, torque sensor, etc. There is a method of detecting the force that the sensor pushes the carriage and replacing it with an electric signal, and supplying a driving force proportional to the load through a control circuit. Each of these methods is slightly different from the feeling that a pilot pushes and moves a simple mechanical cart without a power unit, so there is a need to master it. There is a need for trolleys that carry heavy objects. The hand cart referred to in the present invention includes not only a luggage cart but also a wheelchair, a stroller, a service cart, a luggage cart, and the like.

  We have invented a cart that amplifies the force that the operator pushes the cart, and that carries heavy objects as if it were loaded with light loads on the wheelbarrow. This cart is equipped with an axle rotational force amplifying device for a hand cart that comprises force detection (torque sensing) and electric assist in one part. In this structure, force detection (torque sensing) is calculated from the induced current of the generator function, not the sensor.

  In the sense of carrying a light load on a wheelbarrow with human power alone, it is actually possible to carry heavy objects. Helper's fatigue when using a wheelchair and mother's burden when using a stroller are reduced.

The force with which the driver pushes the carriage is detected by a torque sensor, and the control device calculates the electric assist amount instantly (less than 1/100 second) and assists with a powerful motor. The shaft (axle) coming out from the axle rotation force amplifying device for the handcart has a primary rotor and a secondary rotor inside the motor, and the axle is fixed to the tire wheel. While the primary and secondary rotors cooperate, each moves independently. The tire is preferably a non-flat pneumatic tire. The force that the driver pushes the carriage detects the force with the primary rotor (torque sensing), and the controller calculates the electric assist amount instantaneously (less than 1/100 second), and the secondary command is given by the controller command. Turn the tire by turning the shaft (axle) while the rotor assists as a motor. These series of mechanisms and control software are similar to the operating principle of an electrically assisted bicycle that detects the pedaling force (torque sensing). The greater force required for the dolly once moved is mainly the force against the rolling friction of the tire. The difference between the present invention and most electric assist bicycles is that the primary rotor also detects the force opposite to the direction of travel (torque sensing). It is similar in that the truck is braked. A motor for an electric vehicle has a diameter of about 20 cm. However, the present invention does not require a torque as much as that of an automobile, and thus is miniaturized as much as possible. Each component is highly waterproof and durable. According to the second aspect of the present invention, the control performance of the cart is improved by mounting and controlling the axle rotation force amplifying device for the hand cart one by one on the left and right of the shaft (axle). Although the addition of this mechanism is heavy and expensive, when turning the head, it is very easy to handle a cart that is difficult to steer from side to side by reversing the direction of rotation of the left and right wheels. In the case of a structure in which a wheelchair and a stroller are folded when not in use, the folding can be easily performed if left and right wheel axle power amplifiers are installed. It is designed to be easy to carry with a design that does not reduce structural strength and is easy to carry. This type of wheelchair is usually very easy to carry because it does not have some large diameter wheels. The assist amount by the secondary rotor is variable in accordance with the weight of the article to be transported within a range that does not change the safe speed for use. In other words, for serving carts, etc., the amount of iced is in the range that does not spill food. However, various sensors that are expensive and difficult to develop integrated control software will be introduced for a while. Various sensors refer to weight sensors, acceleration sensors, force sensors, angle sensors, and the like. In order to minimize the assist reaction time, the control unit is arranged as close to the motor as possible without being affected by the heat of the motor. In order to lower the overall unit price, we will use parts of electric assist bicycles that are widely spread and have high reliability, and use high-performance small rechargeable batteries that are widely used in electric assist bicycles such as lithium-ion batteries. Although it corresponds to an emergency to the last, it can be used at 12V and 100V in order to cope with the battery running out. With respect to the battery / power supply circuit, in order to save the trouble of charging, importance is attached to maintainability such as making it detachable from the vehicle body or devising a charging connector. When the present invention is applied to a wheelchair, a stroller, and a serving cart, the form is conceptually combined on the basic chassis shown in FIG.

"Effect of the embodiment"
It is possible to carry heavy objects with the feeling of carrying a light load on a wheelbarrow manually, and the effect is immeasurable. You can easily reverse. In the case of a wheelchair, a stroller, etc., by providing a space for loading the operator's luggage, the burden on the assistant and mother is reduced and fatigue is reduced. You can climb the slope easily. Warning is not allowed, but it does not require excessive structural weight reduction efforts. Since it has a battery, it can be used for a short time in places where there is no power source. Can supply power to other patented blind angle monitors.

"Other embodiments"
Equipped with a joystick that passengers use for maneuvering on electric wheelchairs, so that elderly people can move by their own maneuvers as needed. An axle rotation power amplifying device for ultra-compact handcarts is built in a travel trunk with casters.

The basic principle of this invention is shown. The perspective view of a handcart with an axle rotation force amplifying device.

Explanation of symbols

1 in FIG. 1 1 The operator's pushing hand 2 The force in the direction of travel 3 The control device (calculated from the torque detected by the primary rotor and moves the secondary rotor)
4 Shaft (connects to axle and tire wheel)
5 Detected torque 6 Primary rotor (torque sensor)
7 Secondary rotor (assist motor) 8 Assist torque 9 Symbol in axle "Fig. 2" with amplified rotational force 1 Wheelbarrow with axle rotational force amplifying device 2 Small and high-efficiency motor 3 Control panel 4 Small lithium rechargeable battery 5 Pusher 6 Non-flat pneumatic tire 7 Control device (including external power input unit) 8 Axle to which torque is amplified

Claims (5)

Axle torque amplifying device for handcarts that consists of force detection (torque sensing) and electric assist in one part. The axle rotation force amplifying device for a hand cart of claim 1 is arranged on each of the left and right sides. 3. An axle rotational force amplifying device arranged one by one on the left and right according to claim 2 is built in a tire wheel. The one which drives a caterpillar (endless track) by the axle rotational force amplifying device arranged one by one on the left and right of claim 2. An axle torque amplifying device for a handcart composed of two main parts, a torque sensor and an electric assist motor.

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