JPH0625543B2 - Rotational power joint protection device and protection method thereof - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective device for a rotary power joint installed between an engine and a generator in a vehicle equipped with a generator, etc., and a method for protecting the same. The present invention relates to protection of shear pin loss of a rotary power joint.

(Prior Art) Conventionally, a rotary power transmission device (PTO) using a vehicle engine as a rotary power supply source and a rotary power coupling (universal joint) to drive a load such as a winch is Rapid rotation fluctuation on the power supply side,
For example, at the time of stop, an excessive force is applied to the shear pin of the rotary power transmission device by the inertial force of the load, and the shear pin is damaged, so that the rotary power supply source is protected.

On the other hand, in recent years, in a vehicle for special work and a vehicle for leisure, a lighting device and a large communication device are installed, and a large-capacity power supply for supplying power to these loads is required. In particular, since automobiles are expected to become popular for leisure purposes in the future, when the engine of the automobile is not used for traveling, this is used as a rotary power supply source to generate power through the rotary power transmission device. Driving machines and getting power.

(Problems to be Solved by the Invention) However, when the engine is used as a power source to drive a generator, a rapid rotation fluctuation on the engine side is left with the selection that the rotary power transmission device transmits rotary power. , If there is an erroneous operation, such as a stop, the inertial force of the generator as a load will cause an excessive force to be applied to the shear pin of the rotary power joint, causing the shear pin to be lost and transmitting the rotary power. The device can no longer fulfill its role. Particularly, in the case of a generator as a load, it has a rotor for generating electric power, and the rotor rotates at a high speed, so that its inertia force is naturally large.

On the other hand, conventionally, in order to prevent the shear pin of the rotary power joint from being damaged, in general, attention is only given in the instruction manual or the like so that the engine is stopped after the load is stopped.

In addition to being unable to fully prevent erroneous operations with such measures, the above-mentioned generator-equipped vehicles have become popular, and the operations by general drivers will be performed instead of the operations by full-time operators as with special vehicles. Therefore, the erroneous operation tends to occur frequently.

In order to solve the above problems, the present invention prevents a shear pin of a rotary power joint from being damaged, and protects the rotary power joint so that the engine and the generator can smoothly cooperate with each other even when an erroneous operation is performed. And its protection method.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention relates to a rotary power joint protection device, including an engine, a rotary power transmission device linked to the engine, and a rotary power transmission device. A rotary power joint having a share pin connected thereto, a generator connected to the rotary power joint, a frequency / voltage converter for converting an output frequency of the generator into a voltage, and an output voltage of the frequency / voltage converter. And a reference voltage, a switching means that operates by an output signal of the comparing means, a bypass device that is operated by the operation of the switching device, and an ignition switch that is bypassed by the bypass device. It is the one.

Further, detection means for detecting the off state of the ignition switch, an AND circuit to which the output signal of the detection means and the output signal of the switching means are input, and an alarm / display device driven by the output signal of the AND circuit And are provided.

(Operation) According to the present invention, as shown in FIGS. 1 to 3, the engine (1) is turned on when the ignition switch (14) is turned on.
Is started, and its rotational power is transmitted to the generator (8) via the rotational power transmission device (2) and the rotational power coupling (3),
Electric power is obtained by the generator (8). The frequency of the electric power is converted into a voltage by the F / V converter (10). The voltage converted by the F / V converter (10) and the reference voltage corresponding to the specified rotation speed are compared by the comparator (11). As a result, when it is determined that the value of the voltage converted by the F / V converter (10) is larger than the reference voltage, the output signal is output from the comparator (11) and the switching circuit (12) is operated. The switching circuit
By the operation of (12), the bypass device (13) is operated to bypass the ignition switch (14). With such a configuration, even if the ignition switch (14) is turned off in the erroneous operation, that is, the generator (8) is driven, the engine (1) does not substantially stop and the rotational power is not substantially stopped. Excessive force is not applied to the shear pin (6) of the joint (3), and the shear pin (6) can be protected from being damaged.

Further, in order to give an alarm / display of the state where the ignition switch (14) is bypassed, as shown in FIG. 6, when the ignition switch (14) is operated in the off state, it is detected and the terminal ( Input to one end of the AND circuit (51) via A). On the other hand, when the switching circuit (12) operates, the output signal of the terminal (D) is applied to the AND circuit (51).
To the other end of. Then, set the ignition switch (1
When the signal of "H" is obtained with the 4) turned off, and the control relays (38, 40) operate to the "H" state, the transistor (52) operates and the alarm / display device ( 53) can be driven. From this alarm / display, the driver can recognize that the generator is being driven by an erroneous operation, and can operate the rotary power transmission device (2) to release the linkage between the engine and the generator. .

(Example) Hereinafter, the Example of this invention is described in detail, referring drawings.

FIG. 1 is a schematic block diagram of a rotary power joint protection system showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a rotary power joint protection device showing an embodiment of the present invention, and FIG. 3 is its rotation. It is an exploded perspective view of a power joint.

In these figures, 1 is an engine as a rotary power supply source, 2 is a rotary power transmission device (PTO), 3 is a rotary power joint (universal joint), 4 is an engine side shaft, 5 is a generator side shaft, and 6 is Generator side shaft 5
A share pin for connecting the rotary power joint 3 with the rotary power joint 3, a split pin 7 for preventing the share pin 6 from coming off, a generator driven by an engine, and a control device 9. This control device 9
Includes an F / V converter 10 for converting the output frequency of the generator 8 into a voltage, a comparator 11 for comparing the output of the F / V converter 10 with a reference voltage, and a switching circuit 12. Further, 13 is a bypass device, 14 is an ignition switch, and 15 is a battery.

Therefore, as shown in these figures, when the ignition switch 14 is turned on, the engine 1 is started, and its rotational power is transmitted to the generator 8 via the rotational power transmission device 2 and the rotational power coupling 3. By the generator 8, for example, single-phase / AC power can be obtained. The frequency of this power is F
The voltage is converted by the / V converter 10. Here, the comparator 11 compares the converted voltage with the reference voltage corresponding to the specified rotation speed. As a result, when it is determined that the value of the voltage converted by the F / V converter 10 is larger than the reference voltage, the comparator 11 outputs an output signal to operate the switching circuit 12. By this operation, the bypass device 13 operates and bypasses the ignition switch 14.

Here, the reference voltage is, for example, a generator rotation speed of 1400.
When rpm (21.6Hz) or more, the bypass device 13 operates,
When the generator rotation speed becomes 700 rpm (11.7 Hz) or less, the bypass device 13 is set to a value at which it does not operate.

As a result, even if the ignition switch 14 is turned off while the erroneous operation is being performed, that is, the generator 8 is being driven, the engine 1 is not substantially stopped, and an excessive force is applied to the shear pin 6 of the rotary power coupling 3. It is possible to protect the shear pin 6 from being damaged without adding a force.

Further, as a result of the comparison by the comparator 11, when it is determined that the value of the voltage converted by the F / V converter 10 is smaller than the reference voltage, the output signal from the comparator 11 is not output, so that the bypass device 13 Does not work. Therefore, the engine 1 can be turned on / off according to the operation of the ignition switch 14.

Hereinafter, a specific circuit of the protection device for a rotary power joint of the present invention will be described with reference to the drawings.

FIG. 4 is an overall circuit diagram of a protective device for a rotary power joint showing an embodiment of the present invention, FIG. 5 is a circuit diagram of a control unit of the protective device for the rotary power joint, and FIG. 6 is protection for the rotary power joint. It is a circuit diagram of an alarm / display device of the device.

In these figures, 16 is the excitation device (AV
R), 17 are feeder lines of the generator 8, 18 is a transformer, 19 is an outlet, and 20 is a control unit. This control unit 20 includes resistors 21, 25
~ 28,33, diode 22,23,29,41, capacitor 24,32,3
4, Zener diode 37, and comparator 3
0/35, charge pump 31, and LM2907 having transistor 36, F / V converter 10, comparator
11, constituting the switching circuit 12. Also, 38 and 40 are
The bypass device 31, that is, the relay for controlling the exciting coil of the electromagnetic relay, 39 and 42 are fuses, 51 is an AND circuit, 5
2 is a transistor operated by the output of the AND circuit 51, 5
Reference numeral 3 is an alarm / display device driven by the transistor 52. Here, as the alarm / display device 53, a warning lamp or an alarm device is provided, and notification is provided by a visually appealing display or an auditory warning.

Further, the output of the transformer 18 is connected to the AVR 16, and the voltage side terminals of the resistor 33 and the capacitor 34 are connected to a synchronous speed relay (not shown) and an overspeed relay (not shown).

Therefore, the frequency of the electric power corresponding to the rotation speed output from the generator 8 is output as a pulse corresponding to the frequency by the comparator 30 of the control device 9, and the output pulse is converted into a voltage by the charge pump 31. The comparator 35 compares the voltage with a reference voltage divided by the resistors 25 to 27 and corresponding to the specified rotation speed of the generator 8. When the voltage converted by the charge pump 31 is equal to or higher than the reference voltage, an output signal is output from the comparator 35 and the transistor 36 is turned on. Then, the control relays 38, 40 operate to activate the bypass device 13, thereby bypassing the ignition switch 14.

Next, in order to give an alarm / display of the state in which the ignition switch 14 is bypassed in this way, as shown in FIG. 6, when the ignition switch 14 is operated in the off state, this is detected and the detection signal is detected. It is input to one end of the AND circuit 51 via the terminal A. On the other hand, control relay 3
When 8,40 operates, AND the output signal of the terminal D
Input to the other end of the circuit 51. Therefore, when there is a detection signal of the off state of the ignition switch 14, that is, "H"
And the control relays 38, 40 are in the "H" state, the transistor 52 operates and the alarm / display device 53 can be driven. By thus driving the alarm / display device 53, the driver recognizes that the generator is being driven by an erroneous operation, operates the rotary power transmission device 2, and connects the engine and the generator. You can take measures to cancel.

The present invention is not limited to the above embodiment,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention, the shear pin of the rotary power coupling has been unavoidable due to an unavoidable erroneous operation that can be prevented only on the instruction manual or the like so far. It becomes possible to avoid the loss of the engine, and even if an erroneous operation is performed, the engine and the generator can smoothly cooperate with each other.

Further, by providing the alarm / display device, the driver can easily recognize that the bypass device is in operation due to an erroneous operation, and can take measures accordingly.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a rotary power joint protection system showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a rotary power joint protection device showing an embodiment of the present invention, and FIG. 3 is its rotation. FIG. 4 is an exploded perspective view of the power coupling, FIG. 4 is an overall circuit diagram of a rotary power coupling protection device showing an embodiment of the present invention, FIG. 5 is a circuit diagram of a control unit of the rotary power coupling protection device, and FIG. FIG. 3 is a circuit diagram of an alarm / display device of the protective device for the rotary power joint. 1 ... Engine, 2 ... Rotation power transmission device (PTO),
3 ... Rotary power joint (universal joint), 4 ...
… Engine side shaft, 5… Generator side shaft, 6…
… Share pin, 7 …… split pin, 8 …… generator, 9 …… control device, 10 …… F / V converter, 11 …… comparator, 12 …… switching circuit, 13 …… bypass device, 14
...... Ignition switch, 15 ...... Battery, 16 ......
Exciter (AVR), 17 ... Feed line, 18 ... Transformer, 19
...... Outlet, 20 ...... Control section, 21,25 to 28,33 ...... Resistance, 22,23,29,41 ...... Diode, 24,32,34 ...... Capacitor, 30,35 ...... Comparator, 31 ... … Charge pump, 36,52 …… Transistor, 37 …… Zener diode, 38,40 …… Control relay, 39,42 …… Fuse, 51…
... AND circuit, 53 ... Alarm / display device.

Claims (4)

[Claims] 1. An engine; (a) an engine; (b) a rotary power transmission device linked to the engine; (c) a rotary power coupling having a shear pin connected to the rotary power transmission device; and (d) A generator connected to the rotary power joint; (e) a frequency / voltage converter for converting the output frequency of the generator into a voltage; (f) comparing the output voltage of the frequency / voltage converter with a reference voltage. Comparing means, (g) switching means operated by the output signal of the comparing means, (h) a bypass device operated by the operation of the switching means, and (i) an ignition switch bypassed by the bypass device. A protection device for a rotary power joint, comprising: 2. An (a) detection means for detecting an off state of the ignition switch, (b) an AND circuit to which an output signal of the detection means and an output signal of the switching means are inputted, (c) 2. The rotary power joint protection device according to claim 1, further comprising an alarm / display device driven by an output signal of the AND circuit. 3. An engine, a rotary power transmission device linked to the engine, a rotary power coupling having a shear pin coupled to the rotary power transmission device, and a generator coupled to the rotary power coupling. In the method for protecting a rotary power joint, (a) comparing the output value of the generator with a reference value, (b) as a result of the comparison, if the output value of the generator exceeds the reference value, an ignition switch A method for protecting a rotary power joint, characterized in that the bypass is bypassed. 4. An engine, a rotary power transmission device linked to the engine, a rotary power coupling having a shear pin coupled to the rotary power transmission device, and a generator coupled to the rotary power coupling. In the method for protecting a rotary power joint, (a) comparing the output value of the generator with a reference value, (b) as a result of the comparison, if the output value of the generator exceeds the reference value, an ignition switch And (c) a warning and display of the bypass condition, a method of protecting a rotary power joint.