JP2695389B2 - Electromagnetic clutch controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch control device for connecting a prime mover and a load to each other via an electromagnetic clutch so that they can be connected and disconnected.

[0002]

2. Description of the Related Art As a conventional electromagnetic clutch control device,
Some include an electromagnetic clutch that connects and disconnects a drive end that is rotationally driven by a prime mover and an operating end that is connected to a load, and a changeover switch that turns on and off the drive power of the electromagnetic clutch. It is applied to the vacuum sweeper driven by the driving force from the prime mover.
When the changeover switch is switched from off to on by the user, the electromagnetic clutch is supplied with power to switch from the disengaged state to the connected state, the driving end and the operating end are connected, and the driving force of the prime mover is transmitted to the load. It With such a control device, not only the manufacturing cost can be reduced because the structure is simple, but also the clutch operation is unnecessary and the operability is improved because the contact / separation of the prime mover and the load is controlled only by the changeover switch. be able to.

[0003]

However, the electromagnetic clutch control device having such a structure has a problem that switching from the disengaged state to the connected state is too rapid.

That is, the prime mover always drives near the rated output to drive the wheels, and when the changeover switch is switched from the disconnected state to the connected state, the driving end rotating at high speed suddenly becomes the working end. Will be connected. Therefore, when the load is excessive or a large driving force is required for the initial drive, the working end cannot immediately follow the drive end, and the prime mover stalls or the load is suddenly increased. Not only can the rotation occur, smooth driving cannot be performed, but also the prime mover, the electromagnetic clutch, and the load are greatly burdened, which may shorten the life of the device.

An object of the present invention is to provide an electromagnetic clutch drive mechanism that solves the above problems.

[0006]

In order to achieve the above object, the present invention employs the following configuration.

That is, an electromagnetic clutch control device according to the present invention includes an electromagnetic clutch that connects and disconnects a driving end that is rotationally driven by a prime mover and an operating end that is connected to a load, and a controller that controls a driving voltage of the electromagnetic clutch. A switching switch for outputting a control signal indicating a connected state or a disengaged state to the controller, and when the control signal is switched from the disengaged state to the connected state, the electromagnetic clutch is discontinued from the disengaged state for a predetermined time. The controller is configured to continuously change from the clutch state to the connected state .

The electromagnetic clutch is disengaged when the drive voltage is 0, connected when the drive voltage is 0, and increased between the drive voltage and the drive end when the drive voltage is between 0 and the connection voltage. It is configured to be in a half-clutch state in which the difference in rotation speed from the end is reduced, and the controller connects a plurality of timer resistor circuits in which resistors and timer switches are connected in series, and one end is a power source, The other end is connected to the drive voltage input end of the electromagnetic clutch, and the timer switches are all turned off when the control signal is in the disengaged state, and when the control signal is switched from the disengaged state to the connected state in advance. It is characterized in that it is configured to be individually turned on after a lapse of different set delay times .

[0009]

In the electromagnetic clutch control device having such a configuration, the electromagnetic clutch reaches the connected state through the disengaged state, the half-clutched state, and the connected state over a predetermined time. By adjusting the, the driving force of the prime mover can be gradually transmitted to the load to realize a smooth drive, as well as the prime mover, the electromagnetic clutch,
Also, the burden on the load can be reduced and the life can be extended.

Further, since the controller is constructed by arranging a large number of series circuits of resistors and timers in parallel, effective effects can be obtained with a simple structure, and the number of parts, manufacturing process, and manufacturing cost can be suppressed. , It is also possible to reduce the possibility of failure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In this embodiment, the electromagnetic clutch control device is applied to the vacuum sweeper. As shown in FIG. 1, this vacuum sweeper is equipped with an engine 1 that is a prime mover and wheels 2 that are driven by the engine 1 to enable traveling, and the driving force of the engine 1 is transmitted via an electromagnetic clutch control device 3. The fan 4, which is a load, is also transmitted to suck the grass or the like. The engine 1 is driven near the rated output to drive the wheels 2, and also supplies the driving force to the electromagnetic clutch control device 3 via the belt 11. The fan 4 has a blade shape, and is rotationally driven by the driving force transmitted from the electromagnetic clutch control device 3 to create an air flow and suck the air.

The electromagnetic clutch control device 3 comprises an electromagnetic clutch 5, a controller 6 which supplies a drive voltage Vc to the electromagnetic clutch 5, and a changeover switch 7 which outputs a control signal Sc to the controller 6. Sc
If 1 is 1, the connected state is selected, and if 0, the disconnected state is selected.

The electromagnetic clutch 5 has one end connected to the belt 11 and a drive end 51 which is driven to rotate by the engine 1.
The operating end 52 connected to the fan 4 is brought into contact with and separated from by the electromagnetic force generated by the coil 53 having a resistance value Rcoil driven by the drive voltage Vc. The drive voltage Vc is supplied through the drive voltage input terminal 54. When the drive voltage Vc is 0, the drive voltage Vc is in the disconnection state, when the connection voltage V0 is in the connection state, and when it is between 0 and the connection voltage V0, the drive voltage Vc is in the connection state.
In the half-clutch state, the amount of torque transmitted from the driving end 51 to the actuating end 52 increases in proportion to.

As shown in FIG. 2, the controller 6 is controlled by the control signal Sc output from the changeover switch 7, and includes N timer resistance circuits 61 to 6.
N is connected in parallel, and the output voltage is connected to one end of the connection voltage V0.
Is connected to the drive voltage input terminal 54 of the electromagnetic clutch 5. Timer resistor circuit 6
1 to 6N are resistances 611 to 6N1 and timer switches 612 to 6N2 connected in series, respectively, and the resistance value Rc of the controller 6 is controlled by these timer resistance circuits 61 to 6N, and the electromagnetic clutch 5 is controlled. V0
A driving voltage Vc of × Rcoil / (Rcoil + Rc) is supplied. The resistors 611 to 6N1 have resistance values R1 to RN, and the resistance value RN of the resistor 6N1 is zero. The timer switches 612 to 6N2 are all turned off when the control signal Sc is 0, and when the control signal Sc is 1, the delay times ΔT1 to ΔT are respectively set.
It is configured to switch from off to on after the lapse of N, and the delay times ΔT1 to ΔTN are ΔT1 <ΔT2 <to <
As ΔTN-1 <ΔTN, each timer switch 612 to 612
6N2 is preset to switch from off to on at equal time intervals.

The changeover switch 7 is a switch controlled by the user, and outputs either 0 or 1 to the controller 7 as a control signal Sc.

The operation of such an electromagnetic clutch control device 3 is shown in FIG. When the control signal Sc is 0, the timer switches 612 to 6N2 are all off, the drive voltage Vc supplied by the controller 6 is 0, and the electromagnetic clutch 5 is disengaged. When the control signal Sc switches from 0 to 1 at time 0, immediately after that, the timer switches 612 to 6N2 are all 0 and the drive voltage Vc remains 0. When the delay time ΔT1 elapses, the timer switch 612 is turned on and the timer resistance circuit 61 becomes conductive, so that the resistance value Rc of the controller 6 becomes R1. When the delay time .DELTA.T2 elapses, the timer switch 622 is turned on and the timer resistance circuits 61 and 62 become conductive, so that the resistance value Rc of the controller 6 becomes 1 / (1 / R1 + 1 / R2). When the delay time .DELTA.T3 elapses, the timer switch 632 is turned on and the timer resistance circuits 61 to 63 become conductive, so that the resistance value Rc of the controller 6 becomes 1 / (1 / R1 + 1 / R
2 + 1 / R3). In this way, the timer resistance circuits 61 to 6N sequentially become conductive as time passes, and the drive voltage Vc = V0 * Rcoil / as the resistance value Rc decreases.
(Rcoil + Rc) increases, the electromagnetic clutch 5 becomes a half clutch, and the amount of torque transmitted from the drive end 51 to the operating end 52 gradually increases. When the delay time .DELTA.TN elapses, the timer switch 61N is turned on, but since the resistance value RN of the resistor 6N1 is 0, the controller 6 is short-circuited and the resistance value Rc becomes 0, and the drive voltage Vc becomes V0, and the electromagnetic clutch 5 becomes. Are fully connected. It is desirable to adjust the resistance values R1 to RN of the resistors 611 to 61N so that the drive voltage Vc increases substantially in proportion to time as shown by the virtual line at the bottom of FIG.

The electromagnetic clutch control device 3 having such a configuration
Then, the electromagnetic clutch 5 reaches the connected state from the disengaged state through the half-clutch state over the time of ΔTN. Therefore, the resistance values R1 to RN and the delay times ΔT1 to ΔTN correspond to the characteristics of the engine 1 and the fan 4. Adjustment is performed to gradually transmit the driving force to the fan 4 to realize smooth driving, and reduce the load on the engine 1, the electromagnetic clutch control device 3, and the fan 4 to prolong the life. It is possible. In addition, the controller 6 controls the resistors 611 to 6N.
1 and the timer switches 612 to 6N2 are connected in series to form a large number of timer resistor circuits 61 to 6N in parallel, so that an effective effect can be obtained with a simple configuration, and the number of parts, the manufacturing process, and the manufacturing cost can be suppressed. At the same time, it is possible to reduce the possibility of failure.

As another configuration, as shown in FIG. 4, the changeover switch 7 can be configured as a power switch inserted between the controller 6 and the power source 8. In this case, the control signal Sc is output to the controller 6 as on / off of the power supply voltage, and the timer switch 612
By setting 6N2 to 6N2 so as to switch from off to on after a delay time .DELTA.T1 to .DELTA.TN from the time when the power supply voltage is supplied to the controller 6, it is possible to obtain the same effect as that of the previous embodiment.

Of course, the structure of the present invention is not limited to that described above. For example, the delay time ΔT1 of the timer switch 612 can be set to 0. It is also possible to configure the controller 6 such that the drive voltage Vc is continuously changed by using a variable resistor so that the drive can be performed more smoothly. Further, the prime mover and the load are not limited to the engine 1 and the fan 4. Further, the changeover switch 7 does not have to be directly switched by the user, and may be, for example, one that outputs the control signal Sc via the control circuit. In addition, various modifications can be made without departing from the present invention.

[0021]

In the electromagnetic clutch control device according to the present invention, not only smooth drive can be realized by adjusting the controller according to the characteristics of the engine and the load, but also the load of the prime mover, the electromagnetic clutch and the load. Can be reduced to prolong life.

In addition, since a large number of series circuits of resistors and timers are arranged in parallel to form a controller, effective effects can be obtained with a simple structure, the number of parts, the manufacturing process,
In addition, the manufacturing cost can be suppressed and the possibility of failure can be reduced.

As described in detail above, the present invention realizes smooth driving and life extension of the device with a simple structure, and
It is possible to reduce the possibility of failure while suppressing the number of parts, the manufacturing process, and the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vacuum sweeper to which an embodiment of the present invention is applied.

FIG. 2 is a circuit diagram of a clutch control device of the same embodiment.

FIG. 3 is a graph for explaining an operation when switching from the separated state to the contacting / separating state in the embodiment.

FIG. 4 is a circuit diagram of a clutch control device according to another embodiment of the present invention.

[Explanation of symbols]

 Vc ... Drive voltage V0 ... Connection voltage ΔT1 to ΔTN ... Delay time Sc ... Control signal 1 ... Motor (engine) 3 ... Electromagnetic clutch control device 4 ... Load (fan) 5 ... Electromagnetic clutch 6 ... Controller 7 ... Changeover switch 51 ... Drive End 52 ... Operating end 54 ... Driving voltage input end 61 ... Resistor timer circuit 611-6N1 ... Resistor 612-6N2 ... Timer switch

Claims (1)

(57) [Claims] 1. An electromagnetic clutch that connects and disconnects a driving end that is rotationally driven by a prime mover and an operating end that is connected to a load, a controller that controls a driving voltage of the electromagnetic clutch, and a control signal that indicates a connection state or a disconnection state. the result was and a selector switch for outputting to said controller, when the control signal is switched to the connected state from the disengaged state, continuous with the electromagnetic clutch from disengaged at a predetermined time to the connection state via the half-clutch state In the controller , the electromagnetic clutch is disengaged when the drive voltage is zero.
When the connection voltage is reached, the connection state is established and the connection is made with 0.
When it is between the voltages, the driving
The half-clutch reduces the difference in rotation speed between the moving end and the working end.
The controller is configured to be in a
Is a tie with a resistor and a timer switch connected in series.
Multiple resistance circuits are connected in parallel and one end is the power source.
The other end to the drive voltage input end of the electromagnetic clutch.
Wherein the timer switch is the control signal.
When the signal is in the detached state, all are turned off and the control signal is
Differences set in advance when switching from the disconnected state to the connected state
Configured to switch on individually after a certain delay time
Electromagnetic clutch control apparatus characterized by and comprising.