JP2016212051A - Reversible rotation speed sensor and fixation installation method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an expected two-phase reversible signal by adjusting the attachment angle of a sensor body even when the module of a gear wheel does not satisfy correctly a standard required by a reversible sensor.SOLUTION: The most leading feature is in that a physical relation in which two detection elements provided for obtaining the electrical signal output of two series having a different phase are fixed is matched and fixed with the attachment angle of a sensor relative to a rotation direction so that the length of Cosine projected in the rotation direction of a gear wheel becomes equal to the pitch of an arbitrary selected gear wheel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reversible rotational speed sensor used for detecting the rotational speed of a mechanical device and a fixed installation method of the reversible rotational speed sensor.

  In order to use a rotation speed detection sensor, a gear mounted on a rotating body is required for the purpose of detecting rotation. In order to perform reversible rotation measurement in which the rotation direction can be discriminated from the output form, two sensors are attached to the gear mounted on the rotating body by shifting the tooth attachment phase, and the electric output waveform level is changed. The rotation direction of the rotating body is detected and determined from the phase difference state.

  However, in reality, it goes without saying that it is more convenient to detect with one sensor than to attach two sensors. For this reason, many products having a reversible output with one sensor are on the market, but the gear teeth pitch designated by the sensor is strictly specified for these products. However, even if the type of sensor is arbitrarily determined, it is impossible to use gears with different modules that are not compatible with the sensor for detection.

“SNDH-T Series Quadrature General Industrial Speed and Direction Sensors” Honeywell International, Inc. [Search May 11, 2015], Internet <URL: http://sensing.honeywell.com/sndh-t-series-ps- 000641-3-en-final-03dec09.pdf>

The problem is that the reversible detection sensor cannot be used practically if the gear module is different from the specified standard within a certain range.
The conventional method of mounting this type of sensor is so that when the sensor is mounted and fixed according to the instruction manual, an electrical signal having a phase difference of 90 degrees is actually obtained inside the sensor as viewed from the tooth phase of the specified standard gear. It is supposed to be. Accordingly, there has been a problem that a satisfactory output signal cannot always be obtained when an arbitrary gear is used.

In order to solve the above problems, the reversible rotational speed sensor of the present invention is characterized in that it is adapted to a gear module by adjusting the mounting angle of the sensor body with respect to the rotational surface of the target gear.
In addition, the reversible rotational speed sensor fixed installation method of the present invention adjusts the mounting angle of the sensor body with respect to the rotation surface of the target gear, thereby adjusting the reference marking and the scale of the adaptive module, etc. in order to adapt to the gear module. It is characterized by describing mutually about a sensor and an installation part.

  According to the present invention, even if the gear module does not exactly match the standard required by the reversible sensor, it is possible to obtain the expected two-phase reversible signal by adjusting the mounting angle of the sensor body.

It is a figure which shows the phase relationship of the detection element of a conventional reversible rotation speed sensor, and a gear. It is a figure which shows the phase relationship applied when the module of a gearwheel is small in the Example of this invention. It is a figure which shows the Example of this invention. It is a figure which shows another Example of this invention.

  In general, in order to detect reversible rotation, two sensors are attached with a phase difference of 90 degrees with respect to a gear tooth pitch period of 360 degrees. In this case, by adjusting the mounting state of the two sensors, the object of reversible detection can be achieved without any problem regardless of the state of the gear module.

  However, in recent years, a sensor in which two or more detection elements are integrated is used for detecting reversible rotation in order to reduce the size of the mechanical device and the trouble of adjusting the sensor attachment.

As shown in FIG. 1, a gear 14 used in a conventional reversible rotational speed sensor is attached to a mechanical device for the purpose of speed detection, and the gear 14 rotates in the direction of an arrow 15 along a rotation surface 16. doing.
When the sensor 11 having two or more detection elements 11A and 11B in the main body is used as shown in FIG. 1, the distance between the two detection elements 11A and 11B is the pitch of the gear teeth. Must be equal to approximately one quarter of the interval (approximately 90 ° phase difference interval). For this reason, the gear module that can be adapted by the sensor is uniquely determined.

  This requires the installation of gears that can accommodate sensors for each mechanical device, so even if there is a gear rotating for other purposes in the mechanical device, it is not always possible to use it for rotation detection. Not always applicable to mechanical sensors. In addition, the space for mounting the rotation detection gear may be a problem.

  Here, in order to detect a reversible speed with a small module gear, the sensor 11 shown in FIG. 1 is attached in the same manner as that shown in FIG. That is, when the sensor 11 shown in the right side of FIG. 2 is attached in the same manner as the attachment of FIG. 1, the detection element 11B of the sensor 11 is compared with the timing 2C of the detection element 11A of the sensor 11. The timing of the 90 degree phase difference should be originally 2D position. However, actually, the position of the detection element 11B of the sensor 11 deviates from the position of the timing 2D corresponding to the 90-degree phase difference.

  As an improvement measure, in the present invention, even when the integrated sensor having the same two detection elements used in FIG. 1 is applied to a gear of an arbitrary small module, as shown in the sensor 21 of FIG. By keeping the angle θ shown in FIG. 5 and attaching, the distance between the two detection elements of the sensor 21 can be adapted to the gear having a small module. That is, the module may be attached to an arbitrarily small gear so that the angle of Cosecθ is a phase interval length corresponding to one-fourth (25%) of the tooth pitch on the rotation surface 26 of the gear. In the signal obtained from each detection element in this case, the waveform 23 appears with a phase difference of 90 electrical degrees with respect to the waveform 22.

  FIG. 3 is a view showing an example of a sensor main body and an attachment mode. The fixing bracket 31 of the sensor body 37 is provided with a hole having a diameter several tens of microns larger than the diameter of the sensor body 37. The fixing bracket 31 is provided with a notch 38, a push screw 36 for tightening the width of the notch 38, and a portion 35 where a screw for the push screw 36 is cut. Further, since the sensor main body 37 needs to be installed at an angle suitable for the gear module of interest, the fixed bracket 31 is engraved with a scale 32 calculated in advance. On the other hand, the sensor body 37 is provided with a marking 34 that serves as a reference for the mounting angle.

  When the sensor body 37 is installed, the sensor body 37 is inserted into the hole of the fixed bracket 31 from the tip, and is rotated at an angle so as to match the scale 32 written in accordance with the gear module of interest. Then, by tightening the push screw 36, the sensor body 37 is fixed to the fixing bracket 31 at an attachment angle whose insertion depth and phase are adjusted.

  The brackets as described above do not particularly define the structure, but in short, if the mounting angle is easily understood, the purpose of reversible detection can be achieved, so a seal as shown in FIG. Those coated with are preferably used.

  Since the relationship between the scale and marking is related to the sensor body and the bracket, the marking is provided on the sensor body and the bracket is scaled in this embodiment. Is achieved.

  DESCRIPTION OF SYMBOLS 11 ... Sensor, 15 ... Arrow, 16 ... Rotation surface, 21 ... Sensor, 22 ... Waveform, 23 ... Waveform, 26 ... Rotation surface, 31 ... Sensor fixing bracket, 34 ... Marking, 35 ... Part, 36 ... Push screw, 37 ... Sensor body

Claims (2)

  A reversible rotational speed sensor, which is adapted to a gear module by adjusting an attachment angle of a sensor body with respect to a rotational surface of a target gear.   In the fixed installation method of the reversible rotation speed sensor, which adjusts the mounting angle of the sensor main body with respect to the rotation surface of the target gear to adapt it to the gear module, the reference marking and the scale of the adaptive module etc. are installed with the sensor A method for fixed installation of a reversible rotational speed sensor, characterized in that the parts are described mutually.

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