JPS6231222B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides that when the rotation of the driving shaft changes, the rotation speed of the driven shaft always conforms to the optimum characteristic curve in response to each change in the rotation speed of the drive shaft. The present invention relates to a rotation control method that automatically controls rotation so that the rotation speed can be increased.

For example, when an engine is used to drive a generator, an energy-saving system is provided by controlling the ratio between the engine rotation speed and the generator rotation speed according to the characteristics of the driven side generator. be able to.

As another example, if the load on the driven shaft is not uniform, such as a compressor, oil, water pump, fan, etc., and the rotation speed and load characteristics are not uniform, the engine also has uneven rotation speed and output characteristics. When there is a combination of both or two or more types of loads, it is sometimes necessary to change the rotation speed of the driven shaft with certain characteristics with respect to the engine rotation speed.

The situation is shown in Figure 1. That is, in the figure,
Nr indicates the rotation speed of the drive shaft (engine), and Nn indicates the rotation speed of the driven shaft, and the ratio of the two generally tends to decrease as the rotation speed of the drive shaft increases. However, in the relationship between the two, there are characteristics that are suitable for this, and even though the optimal characteristics shown by the solid line are desirable, in reality, when the engine is operated at various rotational speeds as shown by the dotted line. There are also quite a few.

Therefore, it is extremely necessary to improve the relationship between the two and to be able to control the driven side rotation speed with characteristics that are always suitable for changes in engine rotation speed, and it is equally required by the industry. be.

The present invention has been developed in response to the above-mentioned circumstances and demands, and it is an object of the present invention to provide a V-belt variable speed rotation control method capable of controlling rotation in accordance with the above-mentioned required characteristics. The purpose is to

That is, the present invention is characterized in that it includes a driving pulley and a driven pulley opposite to the driving pulley, and a V-speed change pulley is disposed on at least one of the driven pulleys, and tension is applied to the V-belt suspended between both pulleys. In a belt transmission mechanism that is equipped with a tension pulley that provides a V-belt, a specific method for controlling the rotation speed using the tension pulley is to use power to vary the tension that the tension pulley applies to the V-belt in both positive and negative directions. Movable and movable,
The movement of the tension pulley is captured as a voltage change according to the movement of the tension pulley by a displacement or angle converter linked thereto, and on the other hand, the shaft rotation speed of the drive pulley is changed to a voltage proportional to the rotation speed,
The two voltage signals are guided to a differential amplifier, which detects whether the potential difference is positive, negative, zero, or close to zero, outputs a differential signal corresponding to the difference, and operates a forward/reverse operating converter based on the signal. The tension pulley is operated as the power to operate the tension pulley, and the tension pulley is adjusted so that the potential difference between the two voltage signals to the differential amplifier is zero or within a range close to zero with a certain width. In this method, the number of revolutions of the driven pulley is maintained at a required number of revolutions or at a number of revolutions that conforms to a required optimum characteristic curve in response to changes in the number of revolutions of the driving pulley.

Hereinafter, specific embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

Fig. 2 shows an example of a belt transmission mechanism that implements the rotation control method according to the present invention. A V-belt 5 is suspended across the belt, and a tension pulley 6 is provided to press the back side of the belt on the slack side. The effectiveness of the V-belt 5 can be changed.

On the other hand, the drive pulley 1 has a coaxial gear 3 at its end that rotates integrally with the drive pulley 1, and a magnetic rotating pickup 4 adjacent to the gear 3.
is installed.

In the above configuration, the tension pulley 6 is attached to the tip of the arm 8 which is pivotally attached to the shaft 9 supported by the bearing 7.
A variable resistor 1 is supported on a bearing 7 and is rotatable or movable integrally with the shaft 9 by an arm 8, and at the end of the shaft 9 is also a variable resistor 1 movable integrally with the shaft 9.
0 and a geared motor 11 are provided, respectively.

Therefore, the relative rotation of the arm 8 with respect to the shaft 9 is interlocked with the variable resistor 10 on the one hand, and with the geared motor 11 on the other hand.

FIG. 3 is a block diagram for implementing the rotation control method of the present invention when using the belt transmission mechanism as described above. In particular, although the mechanism is mainly shown in FIG. An electric control system is combined to automatically control the shaft rotation of the driven speed change pulley 2 with respect to the drive shaft rotation speed. That is, the rotation signal of the drive shaft is now taken out by the magnetic rotation pickup 4, and the signal is introduced as a voltage change to the differential amplifier _M2 via the rotation amplifier _M1 . On the other hand, the voltage change generated by the variable resistor 10, which operates in conjunction with the vertical position change of the tension pulley 6, is guided to the differential amplifier _M2 , and the voltage signal from the rotation of the drive shaft and the variable resistor 10 are connected to each other. Based on the potential difference of the generated voltage signal, the output signal from the differential amplifier _M2 is applied to a forward/reverse operation converter consisting of a servo amplifier _M3 , which is operated to generate power for forward rotation, reverse rotation, and stop. is applied to the geared motor 11, and the tension pulley 6 is actuated by the rotation of the geared motor 11. At this time, the voltage on the variable resistor 10 side also changes in conjunction with the rotation of the drive shaft. Output voltage signal and variable resistor 1
The geared motor 11 is operated to automatically move the tension pulley 6 to a balanced position where the voltage signal from the 0 side is zero within the differential amplifier _M2 or within a range close to zero with a certain width. The rotation ratio of each pulley between the driving side and the driven side is maintained appropriately.

Therefore, even if the rotational speed of the driving side variable speed pulley 1 changes, the driven side pulley 2 changes accordingly.
In order to obtain an appropriate and balanced rotation speed for that case, and when there is a predetermined characteristic curve for the driving side and driven side, the rotation ratio of both sides that matches this can be maintained. can be controlled.

Note that although the above description is based on the case where the driven pulley is a V speed change pulley, it is also possible to apply the above control system even when the drive pulley is a speed change pulley.

Further, in the mechanism shown in FIG. 2, a magnetic rotation pickup is used as a drive-side rotation detector, and a variable resistor 10 is used as a device that is linked to the arm 6 for operating the movable pulley piece, but instead of the former, a power generation type It is also possible to use a system that directly extracts an analog signal, such as a tachometer, or to use a differential transformer, variable capacitor, magnetic sensor, etc. instead of the latter, and any of these methods can produce the same effect.

Note that the rotation control method of the present invention is particularly effective when an engine is used as the prime mover.

As described above, in a belt transmission mechanism using a variable speed pulley on either the driving pulley or the driven pulley, the present invention utilizes a tension pulley to adjust the displacement or Detects the angle conversion position, and more specifically generates a voltage change according to the movement, and in particular moves the tension pulley in both positive and negative directions via an arm, etc., and generates a voltage signal obtained from the drive shaft. Then, the voltage signal from the variable resistor side obtained in conjunction with the displacement converter or angle converter due to the movement of the arm is adjusted to a balanced position within the differential amplifier to rotate both the driving and driven axes. Since it is designed to match the ratio to the required characteristics, even if there are various changes in the shaft rotation speed of the driving pulley, it will always match the desired characteristics for the driven pulley in response to each of these rotation speeds. The movable pulley piece of the driven side pulley piece can be automatically adjusted so that the movement of the pulley piece on the driven side can be automatically adjusted, even when the load characteristics on the driven side are not uniform in automobiles, etc., and even when the engine speed and output characteristics are not uniform. Each of these has the advantage of being able to change the rotation of the driven shaft with predetermined characteristics in response to changes in engine speed.

In this way, by providing the tension pulley and using the above-mentioned movable configuration, there is no waste between the number of rotations on the driving side and the number of rotations on the driven side, and the simple configuration not only saves energy but also improves the durability of the mechanical equipment. It is expected that it will be put to practical use not only economically, but also in terms of effectiveness.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the relationship between the rotational speeds of the driving shaft and the driven shaft, FIG. 2 is a schematic perspective view of a mechanism implementing the V-belt variable speed rotation control method of the present invention, and FIG. 3 is the same as that shown in FIG. 1 is a block wiring diagram of an electrical control system; FIG. 1... Drive side V pulley, 2... Drive side variable speed V pulley, 3... Gear, 4... Magnetic rotation pick-up, 5... V belt, 6... Tension pulley, 7... Bearing, 8... Arm, 9...shaft, 10...variable resistor, 11...geared motor, _M1 ...rotary amplifier, _M2 ...differential amplifier,
_M3 ... Servo amplifier.

Claims (1)

[Claims] 1 A tensioner comprising a driving pulley and a driven pulley facing the driving pulley, disposing a V-speed variable pulley on either of these pulleys, suspending the V-belt between both pulleys, and applying tension to the V-belt. In belt transmission using a transmission mechanism provided with a pulley, the tension pulley is of a movable type that can be moved in both positive and negative directions by power so that the tension applied to the V-belt can be varied, and the movement of the tension pulley is linked to this. A displacement or angle converter is used to generate a voltage change according to the movement of the tension pulley, while the shaft rotation speed of the drive pulley is changed to a voltage proportional to the rotation speed, and both voltage signals are sent to a differential amplifier. power that operates the tension pulley by detecting whether the potential difference is positive, negative, zero, or close to zero, outputs a corresponding differential signal, and operates a forward/reverse operation converter based on the signal. The tension pulley is operated as shown in FIG. A V-belt variable speed rotation control method characterized by maintaining the rotational speed of the driven pulley at a required rotational speed according to the rotational speed of the driven pulley or maintaining the rotational speed of the driven pulley so as to conform to a required characteristic curve with respect to changes in the rotational speed of the driving pulley. .