JPH0543702U - Electric vehicle accelerator control device - Google Patents

Abstract

(57) [Summary] [Purpose] Release the brake by tilting the handle,
This is an accelerator control device for electric vehicles, which changes the traveling direction by turning the steering wheel. It reduces the number of wires and effectively utilizes the space in a narrow vehicle body. [Structure] In an accelerator control device for an electric vehicle in which speed is controlled by a limit switch that is integrally interlocked with a rotation operation of an accelerator lever, a circuit in which a timer is activated by the activation signal of the limit switch and a notch is raised thereafter. As a configuration, the number of wires can be reduced and the space in a narrow vehicle body can be effectively used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an accelerator control device for an electric vehicle, particularly a pallet truck, in which the brake is released by tilting the handle and the traveling direction is changed by the turning movement of the handle.

[0002]

[Prior Art]

 Conventionally, a cam is fixed to the accelerator lever, and one or more limit switches are sequentially operated by the cam, and a resistor connected in series with the traveling motor is short-circuited with a relay contact corresponding to the sequential operation of the limit switch. The configuration is such that the traveling speed is controlled by controlling the voltage applied to the traveling motor.

[0003]

[Problems to be solved by the device]

 In the former conventional technique, one control contactor is used for one microswitch, and as the number of control stages increases, the number of microswitches and the number of electric wires used for wiring increase accordingly, and However, there was a problem that there was no space and it was difficult to place and adjust parts. Also, especially when tilting the handle, if the number of wires that penetrate the movable part is large, the movable range is restricted, there is no space, and the wires require bending resistance, which is expensive. It was The present invention has been devised to solve the above problems.

[0004]

[Means for Solving the Problems]

 The present invention is an accelerator control device for an electric vehicle in which the speed is controlled by a limit switch that is integrally linked with the rotation operation of the accelerator lever, and the timer is activated by the activation signal of the limit switch, and the notch is raised by the timer thereafter. The circuit configuration solves the above-mentioned problems.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4, which is a side view of a low lift truck equipped with the present invention. 1 is a low lift truck, 2 is a vehicle body of the low lift truck 1, 3 is a drive wheel, 4 is an idle wheel, 5 is a handle for releasing a brake by tilting and changing a traveling direction by a turning motion, and 6 is a handle 5 in the vicinity thereof. A rotatably provided accelerator lever 26 is a control device for issuing a command signal for controlling the traveling speed to the vehicle body 2 by rotating the accelerator lever 6 described above.

FIG. 2 is an accelerator lever structure diagram, in which a cam 7 is provided inside the accelerator lever 6, and a controller 8 formed on an upper portion of the handle 5 is operated by a convex portion of the cam 7 to advance a limit. Two switches LS1 and reverse limit switch LS2 are attached, and the forward limit switch LS1 and reverse limit switch LS2 also serve as the first notch.

FIG. 3 shows a control circuit diagram. The forward limit switch LS1 is provided with an exciting coil X1 of a forward contactor in the control device 26, and the reverse limit switch LS2 is provided with an exciting coil X2 of a reverse contactor. Is connected in parallel to the 2-notch timer exciting coil T1 via backflow prevention diodes D1 and D2. The normally open contact T1 of the 2-notch timer is the exciting coil X3 of the 2-notch contactor and the exciting coil T2 of the 3-notch timer, and the normally-open contact T2 of the 3-notch timer is the exciting coil X4 of the 3-notch contactor. It is composed by connecting and.

FIG. 4 shows a main electric circuit diagram. The armature 19 and the normally open contact point X1 of the forward contactor and the normally open contact point X2 of the forward contactor both perform forward and backward movement and control the speed of the first notch. A forward / reverse switching circuit 20 and a resistor 21 are connected in series, and a resistor 21 is sequentially short-circuited at a normally open contact X3 of a 2-notch contactor and a normally-open contact X4 of a 3-notch contactor to configure a circuit for speed control. is doing.

The present invention is configured as described above, and when the forward limit switch LS1 is actuated, the forward contactor exciting coil X1 and the 2-notch timer exciting coil T1 are both excited, and the forward / reverse switching circuit is also provided. The normally open contact X1 of the forward contactor in 20 is electrically connected, and a current flows through the entire resistor 21 to control the forward traveling speed at the first notch.

When a set time has elapsed from the excitation start time of the 2-notch timer exciting coil T1, the normally-open contact T1 of the 2-notch timer is activated, and the 2-notch contactor exciting coil X3 and 3-notch contact When the excitation coil T2 of the timer is excited, the normally open contact X3 of the 2-notch contactor is activated to short-circuit half of the resistor 21. As the resistance value becomes lower, more current flows, and the control shifts to forward traveling control at the second notch where the traveling speed becomes faster than at the first notch. After that, when the set time elapses from the excitation start time of the 3-notch timer exciting coil T2, the normally-open contact T2 of the 3-notch timer is activated and the exciting coil X4 of the 3-notch contactor is excited. Then, the normally open contact X4 of the 3-notch contactor is activated to short-circuit the resistor 21. When the resistance value disappears, a large amount of current flows, and the vehicle moves to forward traveling control at the third notch where the traveling speed becomes faster than at the second notch. In short, the cam 7 linked to the accelerator lever 6 actuates the forward and reverse limit switches LS1 and LS2 to start traveling, and the traveling speed is controlled by a timer in the course of progress of the notch.

On the contrary, when the reverse limit switch LS2 is activated, the exciting coil X2 of the backward contactor and the 2-notch timer exciting coil T1 are both excited, and the forward / reverse switching circuit 20 is moved forward. The normally open contact X2 of the contactor is electrically connected, and a current flows through the entire resistor 21 to control the backward traveling speed at the first notch. The following notches are the same as above.

[0012]

【effect】

 As described above, the present invention relates to an accelerator control device for an electric vehicle in which the speed is controlled by a limit switch that is integrally linked to the rotation operation of the accelerator lever as described above. By using a circuit configuration that uses a timer, the number of micro switches can be reduced and the number of wires that connect the limit switch and each contactor in the control circuit can be reduced, so space can be effectively used in a narrow vehicle body. This makes it easy to place and adjust parts, and even when the handle is tilted, there are few wires that penetrate the moving parts, the movable range is not restricted, and the wires are expensive The number of required electric wires is reduced, and the practical effect that the electric wires can be provided at low cost is great.

[Brief description of drawings]

FIG. 1 is a side view of a low lift truck equipped with the present invention.

FIG. 2 is an accelerator lever structure diagram.

FIG. 3 is a control circuit diagram of the present invention.

FIG. 4 is a main electric circuit diagram.

[Explanation of symbols]

 1 Low lift truck 2 Vehicle body 3 Drive wheel 4 Idler wheel 5 Handle 6 Accelerator lever 7 Cam 8 Controller LS1 Forward limit switch LS2 Reverse limit switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Shinichi Kajiyama, 2-1-1, Higashijinzou, Nagaokakyo-shi, Kyoto Within Nippon Transport Co., Ltd. No. Japan Transport Co., Ltd. (72) Inventor, Yoshito Tanaka, 1-1 1-1 Higashijinzou, Nagaokakyo, Kyoto Prefecture

Claims (1)

[Scope of utility model registration request] 1. In an accelerator control device for an electric vehicle in which speed is controlled by a limit switch that is integrally interlocked with a rotation operation of an accelerator lever, a timer is activated by an activation signal of the limit switch, and a notch-up is subsequently performed by the timer. An accelerator control device for an electric vehicle characterized by performing.