JP2016136032A - Belt vibration detecting system and belt vibration detecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt vibration detecting system and a belt vibration detecting method, capable of detecting vibrations of a belt without contacting with the belt, with a comparatively simple structure, and issuing an alert or stopping a belt drive device before the generation of spin vibrations, in a belt transmission mechanism transmitting power from a driving pulley to a driven pulley through the belt.SOLUTION: A gap sensor 21 for measuring a separation distance Ls from a belt 13 is provided in a first range R1 between a separation point Pa at which the belt 13 separates from a driving pulley 11 and a first position P1 separated from the separation point pa to a downstream side by a first distance L1 set in advance, or a second range R2 between a merging point Pb at which the belt 13 contacts with a driven pulley 12 and a second position P2 separated from the merging point Pb to an upstream side by a second distance L2 set in advance. The gap sensor 21 detects vibrations of the belt 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a belt shake detection system and a belt shake detection method for detecting belt shake in a belt drive mechanism that transmits power from a drive shaft of an internal combustion engine to a drive shaft of an auxiliary machine.

  In an internal combustion engine, a drive pulley is provided on the drive shaft (crankshaft) of the internal combustion engine and a passive pulley is provided on the auxiliary machine side for an auxiliary machine such as an alternator, radiator fan, mechanical supercharger, etc. A transmission belt is connected between the two pulleys via a belt tension adjusting tensioner.

  However, this belt is stretched to lose its elastic force due to aging, the tension is reduced, and a belt between the pulleys called a span vibration undulates in the belt fed from the drive pulley. If this span vibration occurs, the belt will loosen and slip and the driving force will not be transmitted sufficiently, or the belt will jump and slip laterally in the width direction of the pulley, so that it will not be able to drive the accessory because it will come off the pulley. There is a problem that the internal combustion engine itself cannot operate normally and a failure occurs. Although the occurrence of this span vibration is rare, once it occurs, the internal combustion engine will be seriously damaged. Therefore, it is important to detect this at an early stage and replace the belt.

  As a measure against the vibration of the belt, for example, an idler that suppresses the vibration of the belt is arranged on one side of the belt that is stretched so as to be separated and approachable, and a vibration detection sensor that detects the vibration of the belt is provided close to the belt. The belt runout suppression that suppresses the runout of the belt by moving the idler forward toward the belt only when the runout of the belt becomes large by the control of the controller based on the detection signal from the shake detection sensor. An apparatus has been proposed (see, for example, Patent Document 1).

  In this belt runout suppression device, when the runout amount exceeds a certain runout amount using a scientific runout detection sensor that is arranged at an intermediate position between the crank pulley and the alternator pulley and is composed of a light emitting diode and a phototransistor. A shake detection method for detecting the repetition of the received light shielding that occurs is exemplified. Also, there is exemplified a shake detection method for embedding a metal piece over the entire length on one side surface of the belt in the shake direction and detecting the approach of the metal piece generated when the shake amount exceeds a certain shake amount to the electromagnetic pick. Yes.

  However, since these detection devices are arranged near the center between the pulleys, which is the antinode portion where the vibration amplitude of the belt is maximum, the belt is a phototransistor when the belt is greatly shaken or cut. There is a possibility that the detection sensor may be damaged due to contact with or colliding with a detection sensor such as an electromagnetic pick or an electromagnetic pick, and further, it is impossible to continuously detect the belt elongation or the deteriorated state of elasticity. .

  Further, a drive side rotation state detection means for detecting the rotation state of the driving wheel driving the endless transmission band, a driven side rotation state detection means for detecting the rotation state of the driven wheel driven by the endless transmission band, A tension adjusting device for an endless transmission band in an internal combustion engine that calculates a rotational phase difference between driven wheels from the detection result of the rotational state detection means and detects a relatively small change in tension in the transmission band based on the rotational phase difference. It has been proposed (see, for example, Patent Document 2).

  However, in the tension adjusting device for an endless transmission band in this internal combustion engine, in order to detect subtle fluctuations in rotation, a plurality of magnetic material pulsar projections and electromagnetic A relatively complicated configuration such as a pickup and a calculation are necessary to detect a phase difference from these configurations.

  In addition, an operating part (tension roller) of a tensioning device is brought into pressure contact with an outer surface of an annular transmission wound between a plurality of rotating bodies, and a light or magnetic gap sensor for detecting displacement movement of the pressing part is operated. There has been proposed a bending detection device for an annular transmission that is attached so as to face the moving position of the part with a gap and detects the deflection of the annular transmission with this gap sensor (see, for example, Patent Document 3).

  In this annular transmission bending detection device, the displacement movement of the pressure contact portion in contact with the annular transmission is detected by the gap sensor, and the operating portion is always in pressure contact with the annular transmission. There is a problem that the annular transmission is worn.

Japanese Patent Laid-Open No. 5-26313 JP-A-8-326853 JP-A-9-256865

  As a result of many experiments, the present inventor has found that a small amplitude is about several millimeters on the downstream side of the drive pulley and the upstream side of the passive pulley before the span vibration occurs between the drive pulley and the passive pulley. The knowledge that belt runout occurred was obtained.

  The present invention has been made in view of the above, and an object of the present invention is to provide a belt transmission mechanism for transmitting power from a drive pulley to a passive pulley by a belt with a relatively simple configuration using a gap sensor. Belt vibration detection system and belt vibration detection method capable of detecting belt vibration without contacting the belt and generating an alarm or stopping the belt driving device before span vibration occurs Is to provide.

  In order to achieve the above object, a belt vibration detection system according to the present invention is a belt transmission mechanism for transmitting power from a driving pulley to a passive pulley by a belt, and a separation point where the belt is separated from the driving pulley and the separation point. A first range between a first position separated by a first distance preset on the downstream side, or a junction point where the belt contacts the passive pulley and a second distance preset upstream from the junction point A gap sensor for measuring a separation distance from the belt is provided in a second range between the second position and the second position, and the deflection of the belt is detected by the gap sensor.

  In order to achieve the above object, the belt vibration detection method of the present invention is a belt transmission mechanism that transmits power from a drive pulley to a passive pulley by a belt, and a separation point where the belt is separated from the drive pulley and the separation A first range between a first position and a first position that is a predetermined first distance downstream from the point, or a merging point at which the belt contacts the passive pulley and a first point set upstream from the merging point. This is a method of measuring a separation distance from the belt with a gap sensor provided in a second range between the second positions separated by two distances, and detecting a vibration of the belt from the separation distance.

  According to the belt vibration detection system and the belt vibration detection method of the present invention, the belt transmission mechanism that transmits power from the drive pulley to the passive pulley by the belt is a relatively simple configuration in which a gap sensor is used to contact the belt. Therefore, the vibration of the belt can be detected, and an alarm can be generated before the span vibration occurs, or the belt driving device can be stopped.

1 is a diagram schematically illustrating a configuration of a belt shake detection system according to an embodiment of the present invention.

  Hereinafter, a belt shake detection system and a belt shake detection method according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a belt runout detection system 20 according to an embodiment of the present invention includes a first range R1 and a first range in a belt transmission mechanism 10 that transmits power from a drive pulley 11 to a passive pulley 12 by a belt 13. Two ranges R2 are provided. The belt 13 is tension-adjusted by a tensioner 14.

  The first range R1 is a range between a separation point Pa where the belt 13 is separated from the drive pulley 11 and a first position P1 which is separated from the separation point Pa by a first distance L1 set in advance downstream. The second range R2 is a range between a joining point Pb where the belt 13 is in contact with the passive pulley 12 and a second position P2 separated from the joining point Pb by a second distance L2 set in advance upstream.

  The first distance L1 is 0.01 to 0.3 times the diameter D1 of the drive pulley 11 although it depends on the size of the drive pulley 11 and the width, shape, and material of the belt 13. The second distance L2 is also 0.01 to 0.3 times the diameter D2 of the passive pulley 12 depending on the size of the passive pulley 12 and the width, shape, and material of the belt 13. The diameters D1 and D2 are the diameters of the portions where the pulleys 11 and 12 are in contact with each other.

  A gap sensor 21 that measures the separation distance Ls from the belt 13 is provided in the first range R1 or the second range R2, and the deflection of the belt 13 is detected by the gap sensor 21. The detected vibration of the belt 13 is input to the control device 22, and when the detected vibration is larger than a preset first determination width, an alarm is generated and the operation is performed. Prompts the person to replace the belt 13. Further, when the deflection is larger than a preset second determination deflection width, the driving of the belt 13 is immediately stopped.

  The gap sensor 21 is non-contact and has only a measurement range of several mm to several tens of mm. Therefore, the gap sensor 21 is a commercially available optical sensor or an electromagnetic sensor that senses magnetism such as an iron wire woven into the belt 13. A sensor can be used.

  Next, a belt shake detection method according to an embodiment of the present invention will be described. This method is a belt transmission mechanism 10 that transmits power from a drive pulley 11 to a passive pulley 12 by a belt 13, and a separation point Pa where the belt 13 is separated from the drive pulley 11 and a first preset downstream from the separation point Pa. Within the first range R1 between the first position P1 separated by the distance L1 or at a junction Pb where the belt 13 contacts the passive pulley 12 and a second distance L2 set in advance upstream from the junction Pb. This is a method of measuring the separation distance Ls from the belt 13 by the gap sensor 21 provided in the second range R2 between the second position P2 and detecting the deflection of the belt 13 from the separation distance Ls.

  According to the belt vibration detection system 20 and the belt vibration detection method configured as described above, it is relatively simple that the gap sensor 21 is used in the belt transmission mechanism 10 that transmits power from the drive pulley 11 to the passive pulley 12 by the belt 13. With such a configuration, the vibration of the belt 13 can be detected without contacting the belt 13, and an alarm can be generated before the span vibration occurs, or the belt driving device can be stopped.

DESCRIPTION OF SYMBOLS 10 Belt drive mechanism 11 Drive pulley 12 Passive pulley 13 Belt 14 Tensioner 20 Belt run-out detection system 21 Gap sensor 22 Controller D1 Drive pulley diameter D2 Passive pulley diameter L1 First distance L2 Second distance Ls Separation distance Pa Separation point Pb Junction point P1 First position P2 Second position

Claims (2)

  A belt transmission mechanism for transmitting power from a driving pulley to a passive pulley by a belt, between a separation point where the belt is separated from the driving pulley and a first position which is separated from the separation point by a first distance set in the downstream side. Or a second range between a joining point where the belt contacts the passive pulley and a second position separated from the joining point by a preset second distance upstream. A belt shake detection system comprising a gap sensor for measuring a separation distance from the belt and detecting the belt shake with the gap sensor. A belt transmission mechanism for transmitting power from a driving pulley to a passive pulley by a belt, between a separation point where the belt is separated from the driving pulley and a first position which is separated from the separation point by a first distance set in the downstream side. the first range of, or provided in the second range between the second position apart a second distance which is preset on the upstream side from the merging point and the merging point before SL driven pulley the belt is in contact A belt runout detection method, wherein a gap distance from the belt is measured by a gap sensor, and the runout of the belt is detected from the gap distance.

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