JPH0519962U - Rotation detector mounting structure - Google Patents

Abstract

(57) [Summary] [Structure] The hollow rotary shaft 3 of the rotation detector 2 is coupled to the shaft end 12 of the rotary shaft 11 of the motor 1, and the opening 61 has a curved portion 62 having a bellows-like elasticity. A cup-shaped cover 6 is provided, the fixed portion 4 of the rotation detector 2 is fixed to the side surface portion 64 of the cover 6, and the end of the curved portion 62 is fixed to the bearing housing 15 that is the fixed portion of the motor 1. . [Effect] Since the fixed portion is supported by the cover having the curved portion having a bellows-like spring property, the fixed portion is allowed to be displaced in the axial direction and is prevented from being displaced in the rotational direction.
Since the opening of the cover is in close contact with the bearing housing of the motor to completely shield the inside of the cover from the outside, the rotation detector inside the cover is completely dust-proofed during the assembly work and during operation in a dusty environment.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotation detector mounting structure that is directly connected to a shaft end of a servomotor or the like and detects the rotation speed or rotation position of a rotation shaft.

[0002]

[Prior Art]

 Conventionally, when a rotation detector is connected to the shaft end of a motor, the rotation detector is provided with a hollow shaft that fixes the rotating part, and the hollow shaft is provided with a fixed part through a bearing, and the hollow shaft is connected to the shaft end of the motor. At the same time, the fixed part is fixed to the bearing housing of the motor through a leaf spring to allow axial displacement of the motor shaft end and the hollow shaft, and prevent rotational displacement of the fixed part of the rotation detector. Further, it is disclosed that the fixed portion is provided with a cover for covering the rotating portion (for example, Japanese Patent Laid-Open No. 59-19809). Further, as shown in FIG. 2, the hollow rotary shaft 3 having the rotary portion 21 such as the rotary disk of the rotation detector 2 fixed to the shaft end 12 of the rotary shaft 11 of the motor 1 is fixed, and the hollow rotary shaft 3 has a bearing. The fixing portion 4 provided with the light emitter 41 and the light receiver 42 is supported via 31 and the fixing portion 4 is fixed to the bearing housing 15 of the motor 1 via the leaf spring 5. Further, a cup-shaped cover 6 that covers the entire rotation detector 2 is fixed to the bearing housing 13 of the motor 1 to prevent dust.

[0003]

[Problems to be solved by the device]

 However, in the structure of Japanese Patent Laid-Open No. 59-19809, since the leaf spring is provided between the fixed portion of the rotation detector and the bearing housing of the motor, the fixed portion of the rotation detector and the bearing housing of the motor are provided. There is always a gap between the bearing and the motor, and in an environment with a lot of dust, dust intrudes into the bearing through the gap and the bearings of the motor and rotation detector are contaminated. Also, with the configuration in which the cover that covers the entire rotation detector is fixed to the bearing housing of the motor, the cover cannot be attached until the rotation detector is adjusted and then installed in the motor. There is a risk that a detection error may be caused by dust adhering to the sensor head or the detection head. The present invention is intended to protect the rotation detector and the bearing from dust and the like during the assembling work and even during operation in a dusty environment.

[0004]

[Means for Solving the Problems]

 The present invention relates to a rotation detector mounting structure in which a rotation shaft of a rotation detector is coupled to a shaft end of a rotation shaft of a motor, and a fixed portion of the rotation detector is fixed to a fixed portion of the motor. A cup-shaped cover having a portion is provided, the fixing portion is fixed to a side surface portion of the cover, and an end portion of the bending portion is fixed to a fixing portion of the motor.

[0005]

[Action]

 The fixed part is supported by a cover that has a curved part with a bellows-like spring property, so that it allows axial displacement and prevents rotational displacement, and the cover that covers the rotation detector is the motor's cover. It is closely attached to the bearing housing and completely shields the inside of the cover from the outside.

[0006]

【Example】

 The present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a side sectional view showing an embodiment of the present invention, in which a shaft end 12 of a rotary shaft 11 of a motor 1 is provided with a mounting screw hole 13 and a rotary portion 21 such as a rotary disk of a rotation detector 2 is fixed. The rotary shaft 3 is fixed to the rotary shaft 11 with a mounting screw 14. A fixed portion 4 provided with a light emitting device 41, a light receiving device 42 and the like is supported on the hollow rotating shaft 3 via a bearing 31. The cup-shaped cover 6 that covers the entire rotation detector 2 is made of a thin steel plate having a spring property, a bellows-shaped curved portion 62 is provided in the opening 61, and a flange portion 63 is formed at the end of the curved portion 62. Then, it is fixed to the bearing housing 15 which is a fixed portion of the motor 1 by a mounting screw 65. The side surface portion 64 of the cover 6 is fixed to the fixing portion 4 with a mounting screw 66. A nut insertion hole 67 is provided on the bottom surface of the cover 6 and is sealed with a rubber bush 68. When assembling the rotation detector 2, the stationary portion 4 is assembled to the hollow rotary shaft 3 via the bearing 31, then the rotating portion 21 is assembled, the cover 6 is covered after the adjustment, and the side portion 64 of the cover 6 is attached to the stationary portion 4. Is fixed by a mounting screw 66, and the cover 6, the fixing portion 4 protects the rotation detector 21, the light emitting portion 41, the light receiving portion 42, and the like of the rotation detector 2 that do not like dust. In this state, the rotation detector is stored, the hollow rotary shaft 3 is inserted into the rotary shaft 11 of the motor 1 as required, the rubber bush 67 is removed, and the attachment provided on the shaft end 12 of the rotary shaft 11 The hollow rotary shaft 3 is fixed to the rotary shaft 11 by tightening the mounting screw 14 in the screw hole 13. Further, the flange portion 63 of the cover 6 is fixed to the bearing housing 15 with a mounting screw 65, the rubber bush 68 is inserted into the nut insertion hole 67, and the rotation detector 2 is sealed in the cover 6.

[0007]

[Effect of the device]

 As described above, according to the present invention, since the fixing portion is supported by the cover having the bellows-like bent portion having the spring property, the fixing portion allows the axial displacement and prevents the rotational displacement. Furthermore, since the opening of the cover is in close contact with the bearing housing of the motor to completely shut off the inside of the cover from the outside, the rotation detector inside the cover is completely protected even during the assembly work and during operation in a dusty environment. Has the effect of being protected from dust.

[Brief description of drawings]

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

FIG. 2 is a side sectional view showing a conventional example.

[Explanation of symbols] 1 motor 11 rotating shaft 12 shaft end 2 rotation detector 21 rotating part 3 hollow rotating shaft 4 fixed part 6 cover 61 opening 62 curved part 63 flange part 64 side part

Claims (1)

[Scope of utility model registration request] 1. A rotation detector mounting structure in which a rotation shaft of a rotation detector is coupled to a shaft end of a rotation shaft of a motor, and a fixing portion of the rotation detector is fixed to a fixing portion of the motor. A rotation detector mounting structure characterized in that a cup-shaped cover having a curved portion is provided, the fixed portion is fixed to a side surface portion of the cover, and an end portion of the curved portion is fixed to a fixed portion of the motor. .