JP2005045885A - Accelerator device for battery-driven turret truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accelerator device for battery-driven turret truck that smoothly accelerates, does not need wire links, and can be easily installed in a vehicle and maintained. <P>SOLUTION: The accelerator device comprises a lever 31 that is rotated by vertical motion of the accelerator of a turret truck, a fan-shape gear 33 that is rotated on the spindle 32 of the lever 31, a circular gear 34 that is engaged with the fan-shaped gear 33, and a variable resistor 21 that outputs to a motor controller 12 a resistance value corresponding to the rotation angle of an operation shaft 35 that is rotated with the rotation of the circular gear 34. The gear ratio of the fan-shaped gear 33 to the circular gear 34 is increased. Thus, a small accelerator stroke can be converted into a large rotation angle, and the resistance value of the variable resistor 21 can be varied over a wide range. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an accelerator device for a turret type transport vehicle using a battery as a drive source.
[0002]
[Prior art]
As shown in FIG. 4, the turret type transport vehicle is composed of a cylindrical power unit 41 including a motor, a power transmission device, a front wheel, a handle and the like, and a loading platform 42 provided at the rear thereof. Since the direction is changed by turning, it has a small turning radius and excellent mobility, and is widely used for transporting articles in the premises such as a wholesale market, a factory, and a warehouse. There are two types of driving sources, one using an engine and one using a motor. In recent years, turret type transport vehicles using a battery type motor that does not emit exhaust gas have been widely used.
[0003]
Conventionally, as a speed control means of a turret type vehicle using such a battery type motor, a resistor is provided between the battery and the motor, and the amount of current supplied from the battery to the motor is increased or decreased by operating the accelerator. A method of controlling the thickness step by step has been used. However, in a vehicle that performs such resistance control, it is difficult to drive because there is a large impact at the time of shifting, and the collapse of the load may occur due to the impact. In addition, since a large resistor is used, it occupies a large installation space, and energy is lost in the resistor. Therefore, there are problems such as low energy efficiency, frequent charging, and short battery life. .
[0004]
Therefore, in recent years, a method of chopper-controlling the electric power input to the motor by a motor controller provided between the battery and the motor has been adopted for speed control of the battery vehicle. When such a chopper control method is used, since the speed can be changed steplessly, there is no impact at the time of gear shift such as resistance control. In addition, there is little energy loss and the battery life is extended.
[0005]
In such a chopper-controlled battery vehicle, as described in Non-Patent Document 1, a variable resistor is connected to the motor controller, and the resistance value of the variable resistor is changed by an accelerator operation. The acceleration request from the hand is transmitted to the motor controller. When the resistance value of the variable resistor changes, the motor controller determines the chopper rate (duty ratio) based on the value.
[0006]
As shown in FIG. 4, the accelerator operation of the turret-type transport vehicle is performed by pushing down an accelerator 44 provided concentrically with the handle on the upper part of the power unit 41 and slightly inside the handle 43.
[0007]
The accelerator device currently widely used has a structure that changes the resistance value of the variable resistor by rotating a lever fixed to the operation shaft of the variable resistor. The angle is equal to the pivot angle of the lever. Therefore, when the resistance value is changed in a wide range, the lever needs to be rotated largely. However, the stroke of the accelerator is limited to a small range because of the structure of the vehicle body. Conventionally, the movement of the accelerator is changed to a rotational movement by a link mechanism using a wire and is transmitted to a variable resistor. However, in such a wire link mechanism, the accelerator feels heavy due to the influence of friction between the wire and the pulley, etc., and when the friction is large, the accelerator does not return properly and a failure is likely to occur. there were.
[Non-Patent Document 1]
Curtis Instruments, Inc. “Curtis PMC 1204/1205 Manual” 1999, p. 6, fig. 5
[0008]
[Problems to be solved by the invention]
The present invention has been made to solve such a problem, and the object of the present invention is to make it possible to rotate the variable resistor greatly with a small accelerator stroke, eliminating the need for a wire link and smoothing the accelerator operation. It is another object of the present invention to provide an accelerator device for a battery-driven turret-type transport vehicle that is easy to mount and maintain on a vehicle body and excellent in durability.
[0009]
[Means for Solving the Problems]
The accelerator device according to the present invention, which has been made to solve the above problems, is an accelerator device that converts an operation amount of an accelerator of a battery-driven turret-type transport vehicle into a resistance value for a motor controller.
a) a lever that is rotated by the vertical movement of the accelerator;
b) a sector gear that rotates about the support shaft of the lever;
c) a circular gear meshing with the sector gear;
and d) a variable resistor that rotates the operation shaft with the rotation of the circular gear and outputs a resistance value corresponding to the rotation angle to the motor controller.
【Example】
[0010]
Hereinafter, an accelerator device of a turret type transport vehicle according to the present invention will be described with reference to examples. FIG. 1 is a circuit diagram of a drive circuit and a speed control circuit of a turret type transport vehicle using the accelerator device of the present invention, where the drive circuit is represented by a bold line and the speed control circuit is represented by a thin line. FIG. 2 is a circuit diagram showing only a speed control circuit represented by a thin line in FIG. 1, and FIG. 3 shows a side view and a front view of the accelerator device for a motor controller of the present invention.
[0011]
As shown in FIG. 1, the motor controller 12 is provided between the battery 11 and the motor 13 in the drive circuit, and the motor controller 12 chopper-controls the power output from the battery 11 to the motor 13. The F / R contactor 14 is for switching between forward and reverse.
[0012]
The variable resistor 21 of the accelerator device of the present invention is connected to the motor controller 12 as shown in FIG. 2 and outputs a signal of a resistance value corresponding to the accelerator operation amount to the motor controller 12. The micro switches A22 and B23 function as limit switches that are turned ON / OFF according to the accelerator operation. The microswitch A22 is normally closed (turns OFF when pressed). When the accelerator is not operated, the microswitch A22 is pressed to the upper side of the sector gear as shown in FIG. 3 (b) and is in the OFF state. When it rotates and moves away from the micro switch A22, it is turned on. The micro switch B23 is normally open (turns on when pressed) and is normally in an OFF state. When the accelerator reaches the maximum stroke, it is pushed to the lower side of the sector gear as shown in FIG. Become.
[0013]
The accelerator of the turret type transport vehicle is provided at the upper part of the power unit in such a manner that the accelerator shaft penetrates the cover of the unit. Therefore, the accelerator device of the present invention is fixed vertically to the back side of the cover of the power unit, The accelerator shaft and the lever 31 are installed in contact with each other.
[0014]
In the state where the accelerator operation is not performed (FIG. 3B), the lever 31 of the accelerator device of the present invention is pushed upward by the force of the return spring 38 provided on the support shaft 32, and is provided on the support shaft 32 of the lever 31. The upper side of the fan-shaped gear 33 thus brought into contact with the stopper A36 is in a state where the rotation is stopped. At this time, the microswitch A22 is pushed by the upper side of the sector gear 33 and is turned OFF, so that no current flows through the contactor coil A17a. Further, the micro switch B23 is not pressed and is in an OFF state. Therefore, both the contactor A17 and the contactor B18 are in an open state.
[0015]
When the driver depresses the accelerator, the lower end of the accelerator shaft pushes down and rotates the lever 31 of the accelerator device of the present invention. When the lever 31 rotates, the sector gear 33 rotates around the support shaft 32 of the lever 31 as a central axis. When the upper side of the sector gear 33 moves away from the micro switch A22, the micro switch A22 is turned on and a current flows through the contactor coil A17a. As a result, the contactor A17 is closed, a current flows through the drive circuit, and the motor 13 rotates.
[0016]
As the sector gear 33 rotates, the circular gear 34 that meshes with the sector gear 33 rotates. At this time, by increasing the gear ratio, the circular gear 34 can be largely rotated at a small rotation angle of the sector gear 33. Since the circular gear 34 is provided on the operation shaft 35 of the variable resistor 21, the resistance value of the variable resistor 21 continuously increases as the circular gear 34 rotates, and the resistance value according to the accelerator operation amount. Is output to the motor controller 12. The output of the motor 13 is controlled between 0% and 100% according to the value, and the traveling speed changes continuously.
[0017]
When the lever 31 reaches the maximum stroke (FIG. 3 (c)), the rotation of the sector gear 33 is stopped by contacting the stopper B37, and at the same time, the micro switch B23 is pushed by the lower side of the sector gear to be turned on. A current flows through the coil B18a. As a result, the contactor B18 is closed, and the current flows directly to the motor 13 without passing through the motor controller 12, and the output of the motor 13 becomes 100%. By directly connecting the battery and the motor in this way, heat loss in the motor controller 12 can be eliminated, power consumption can be reduced, and horsepower can be improved.
[0018]
When the driver weakens the force that pushes down the accelerator, the lever 31 is pushed back by the force of the return spring 38, the micro switch B23 is turned off, and the current flows again to the motor controller 12, and the resistance value of the variable resistor 21 Decreases continuously. The lever 31 returns to the original position, and the rotation of the sector gear is stopped by the stopper A36. At the same time, the micro switch A22 is pushed by the upper side of the sector gear to turn OFF, the drive circuit is shut off, and the output of the motor 13 Becomes 0%.
[0019]
The gear ratio between the sector gear 33 and the circular gear 34 used in this embodiment is 13.4: 1. By engaging the both, the circular gear 34 is approximately 270 ° by the rotation angle of approximately 20 °. Can be rotated. Thereby, since the variable resistor can be largely rotated, smoother acceleration can be obtained than when the conventional accelerator device is used. In addition, by bringing the lower end of the accelerator shaft into contact with the lever of the accelerator device, there is no need for a wire link as in the conventional accelerator device, and the movement of the accelerator can be directly transmitted to the variable resistor. Becomes smooth. In addition, the installation space can be small, the mounting to the vehicle body and maintenance are simple, and the durability is excellent.
In addition, by installing the contact position 40 with the lower end of the accelerator shaft near the base (support shaft 32) of the lever 31, the speed can be adjusted with a smaller stroke of the accelerator shaft. . In this embodiment, the operating shaft of the variable resistor can be rotated by 270 ° with a stroke of the accelerator shaft of only 1 cm.
[0020]
Further, it is desirable that a hole 39 for attaching a spare return spring is provided at the tip of the lever 31 and a spare return spring is installed between the rear surface of the lid of the power unit and the lever 31. Thereby, even when the return spring 38 is damaged, the runaway of the turret type transport vehicle can be prevented.
[0021]
In addition, the battery used for a turret type transport vehicle has a voltage of 36V or 48V, and there are various types of current capacity such as 200A, 275A, and 400A. Accordingly, motor controllers having specifications corresponding to them are used, but the accelerator device according to the present invention can be used for any motor controller.
[0022]
【The invention's effect】
As described above, when the accelerator device according to the present invention is used, the variable resistor can be rotated largely by a slight stroke of the accelerator shaft, and therefore smooth acceleration can be obtained. In addition, since there is no need to link the accelerator shaft and the accelerator device with wires, the number of parts can be reduced, installation space can be reduced, installation and maintenance on the vehicle body is simple, and durability is excellent. Yes. Furthermore, by short-circuiting the motor controller at the maximum stroke, the horsepower at the maximum output can be improved and the power consumption can be suppressed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a drive circuit and a speed control circuit of a turret type transport vehicle using the accelerator device of the present invention. FIG. 2 is a configuration diagram of a speed control circuit of a turret type transport vehicle using the accelerator device of the present invention. 3A is a side view of the accelerator device of the present invention, FIG. 3B is a front view showing the state of the accelerator device of the present invention when the accelerator is not operated, and FIG. 3C is a diagram illustrating the accelerator device of the present invention during the maximum accelerator stroke. Front view showing the state [Fig. 4] Side view of the turret transport vehicle [Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Battery 12 ... Motor controller 13 ... Motor 14 ... F / R contactor 15 ... Key switch 16 ... Accelerator apparatus 17, 18 ... Contactor A, B
17a, 18a ... Contactor coils A, B
21 ... Variable resistors 22, 23 ... Micro switches A, B
31 ... Lever 33 ... Sector gear 34 ... Circular gears 36, 37 ... Stoppers A and B
38 ... Return spring 41 ... Power unit 43 ... Handle 44 ... Accelerator

Claims (2)

In an accelerator device that converts the amount of accelerator operation of a battery-driven turret-type transport vehicle into a resistance value for a motor controller,
a) a lever that is rotated by the vertical movement of the accelerator;
b) a sector gear that rotates about the support shaft of the lever;
c) a circular gear meshing with the sector gear;
d) An accelerator device comprising: a variable resistor that rotates an operating shaft with the rotation of the circular gear and outputs a resistance value corresponding to the rotation angle to a motor controller. In addition,
e) a pair of limit switches provided on both sides of the fan-shaped gear for interrupting current and directly connecting the motor and battery;
The accelerator apparatus according to claim 1, further comprising a pair of stoppers provided on both sides of the sector gear.

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