JPH0594711U - Rotational position detector - Google Patents

Abstract

(57) [Summary] [Construction] The rotation of the rotary position detector by inserting the mounting portion 81 to be coupled to the tip of the rotary shaft of the rotary machine and the opening of one of the hollow rotary shafts of the rotary position detector. A nut portion 83 coupled near the other end of the shaft and a spring portion 82 disposed inside the rotation shaft of the rotation detector and having elasticity only in the axial direction are provided between the mounting portion 81 and the nut portion 83. The rotating machine and the rotation axis of the rotation detector are connected by a coupling. [Effect] The vibration of the slit disk fixed to the rotary shaft of the rotary position detector and the photoelectric detector is reduced, and an abnormal detection signal is not output. Also, the motor of the rotary position detector is directly connected. It is possible to provide a rotational position detector whose length can be shortened and whose quality in which axial displacement is absorbed is stable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary position detector that detects a rotary position of a rotary machine such as a motor, and more particularly to a coupling device for connecting a rotary shaft of a rotary machine and a rotary shaft of the rotary position detector.

[0002]

[Prior Art]

 Conventionally, for example, when the rotation shaft of a rotation position detector is connected to a motor shaft to detect the rotation position of the motor, a taper portion 11 is provided at the tip of the motor shaft 1 and the detector shaft 2 is provided as shown in FIG. A taper hole 21 is provided at the end of the motor shaft 1, and the taper portion 11 of the motor shaft 1 and the taper hole 21 of the detector shaft 2 are fitted together and fastened with a bolt 22. A slit disk 3 is fixed to the detector shaft 2, and the detector shaft 2 is supported by a detector bracket 5 via a bearing 4. A photoelectric detector 6 is fixed to the detector bracket 5 to detect the rotational position of the slit disk 3. It is disclosed that the detector bracket 5 is connected to the motor bracket 7 via a plate spring 6 so that the axial displacement of the motor shaft 1 is absorbed by the plate spring 6 (for example, the actual flat plate 3-88120). Publication).

[0003]

[Problems to be solved by the device]

 However, in the above configuration, since the motor shaft 1 and the detector shaft 2 are directly coupled, the vibration of the motor shaft 1 caused by the unbalance of the rotating portion of the motor and the fluctuation of the load is directly detected. Be transmitted to. Therefore, the slit disk 3 fixed to the detector shaft 2 vibrates, and the detector bracket 5 and the photoelectric detector 6 vibrate via the bearing 4 to cause abnormal detection signals and abnormal sounds. there were. An object of the present invention is to provide a rotational position detector of stable quality, in which vibration of the motor shaft is not directly transmitted to the detector shaft and axial displacement is absorbed at the same time.

[0004]

[Means for Solving the Problems]

 The present invention relates to a rotary position detector for detecting a rotary position of a rotary machine, wherein a mounting portion to be coupled with a tip end portion of a rotary shaft of the rotary machine and one opening of a hollow rotary shaft of the rotary position detector. A nut part which is inserted from the position of the rotary position detector and is connected to the rotary position detector at the other end of the rotary shaft of the rotary position detector and between the mounting part and the nut part. The coupling is provided with a spring portion having elasticity only in the axial direction.

[0005]

[Action]

 The spring of the coupling provided between the motor shaft and the detector shaft transmits torque, but absorbs axial displacement and vibration.Therefore, axial displacement and motor displacement due to thermal expansion of the motor shaft occur. The vibrations transmitted from the rotating part to the motor shaft are absorbed by the spring part of the coupling. Therefore, it is possible to prevent the slit disc fixed to the detector shaft from vibrating.

[0006]

【Example】

 The present invention will be described with reference to the embodiments shown in the drawings. 1 is a side sectional view showing an embodiment of the present invention, in which a slit disk 3 is fixed to a detector shaft 2 and the detector shaft 2 is supported by a detector bracket 5 via a bearing 4, The structure in which the photoelectric detector 6 is fixed to detect the rotational position of the slit disk 3 is almost the same as the conventional example. The following points are different from the conventional example. That is, the tip portion 12 of the motor shaft 1 and the detector shaft 2 are fixed by the coupling 8 having elasticity only in the axial direction. As shown in FIG. 2, the coupling 8 is composed of a hollow disk-shaped mounting portion 81 provided at one end, a cylindrical spring portion 82, and a nut portion 83 having a female screw provided at the other end. .. The spring portion 82 is provided with a spiral groove 82A so as to have elasticity only in the axial direction and transmits torque, but absorbs displacement and vibration in the axial direction. The spring portion 82 may be formed of a coil spring. The mounting portion 81 is fixed to the tip portion 12 of the motor shaft 1 with a screw 81A, and the nut portion 83 passes through the inside from one opening of the hollow detector shaft 2 and a fitting hole provided near the end on the opposite side. The motor shaft 1 and the detector shaft 2 are connected to each other by fitting the motor shaft 1 and the detector shaft 2 by fitting the motor shaft 1 and the detector shaft 2 together with the detector shaft 2. Therefore, the spring portion 82 and the nut portion 83 are inserted inside the detector shaft 2. The detector shaft 2 is supported by a detector bracket 5 via a bearing 4. The detector bracket 5 is directly connected to the motor bracket 7. The torque of the motor shaft 1 is transmitted to the detector shaft 2 by the coupling 8, but the axial displacement due to the thermal expansion of the motor shaft 1 and the vibration transmitted from the rotating portion of the motor to the motor shaft are caused by the coupling 8. It is absorbed by the spring portion 82. Further, since the spring portion 82 and the nut portion 83 of the coupling 8 are loaded inside the detector shaft 2, the axial length of the coupling 8 is not increased by mounting the coupling 8. Further, the length of the spring portion 82 of the coupling 8 can be made shorter than the taper shaft used in the conventional example by reducing the thickness of the spring portion 82 in the axial direction. The motor length when the rotary position detector is directly connected can be shortened.

[0007]

[Effect of the device]

 As described above, according to the present invention, the axial displacement due to the thermal expansion of the motor shaft and the vibration transmitted to the motor shaft from the rotating part of the motor are coupled to the coupling provided between the motor shaft and the detector shaft. The vibration of the motor shaft is not directly transmitted to the detector shaft because it is absorbed by the spring part. Therefore, the vibration of the slit disk fixed to the detector shaft, the photoelectric detector, etc. will be reduced, and abnormal detection signals will not be output, and the axial length of the motor when the rotational position detector is directly connected will be reduced. It is possible to provide a rotational position detector having a short length and stable quality that absorbs axial displacement.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a coupling of the present invention.

FIG. 3 is a side sectional view showing a conventional example.

[Explanation of symbols]

1 Motor Shaft 2 Detector Shaft 3 Slit Disk 4 Bearing 5 Detector Bracket 6 Photoelectric Detector 7 Motor Bracket 8 Coupling 81 Attachment Part 82 Spring Part 83 Nut Part

Claims (1)

[Scope of utility model registration request] 1. A rotary position detector for detecting a rotary position of a rotary machine, wherein a mounting portion to be coupled to a tip of a rotary shaft of the rotary machine and one opening of a hollow rotary shaft of the rotary position detector. A nut portion which is inserted from the rotation position detector and is coupled in the vicinity of the other end of the rotation shaft of the rotation position detector, and is arranged inside the rotation shaft of the rotation detector, and is provided between the mounting portion and the nut portion. A rotational position detector comprising a coupling provided with a spring portion having elasticity only in a direction.