JP3740764B2 - Rotation detector mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation detector mounting structure, and more particularly, to a novel improvement for absorbing a displacement of a rotation detector that changes in accordance with a displacement of a motor shaft of a motor and preventing a decrease in detection accuracy.
[0002]
[Prior art]
Conventionally, the structure shown in FIGS. 5 to 6 has been adopted as this type of rotation detector mounting structure.
That is, what is denoted by reference numeral 1 in FIG. 5 is a rotation detector connected to the motor shaft 3 of the motor 2, and this rotation detector 1 is constituted by a known resolver or encoder. A case support 5 formed on one case 4 is supported in a freely operable state in a recess 6a of a mounting body 6 fixedly arranged on a fixed side (not shown).
As shown in FIG. 6, the case support 5 has a quadrangular cross section, and the case support 5 and the recess 6a have a vertical Y-direction axial runout Y _K as shown in FIG. And an X-direction axial runout dependency amount X _{K in the} lateral direction and a Z-direction axial runout tolerance Z _K in the Z direction shown in FIG. 5.
Accordingly, when the case support column 5 escapes in the X, Y, and Z directions with respect to the attachment body 6 in accordance with the displacement of the motor shaft 3 of the motor 2, the displacement is absorbed by the slip and prevents the case from rotating. .
[0003]
[Problems to be solved by the invention]
Since the conventional rotation detector mounting structure is configured as described above, the following problems exist. That is, to increase the allowable displacement in the X direction, it is necessary to increase the gap between the case column and the recess, which increases the amount of backlash in the rotation direction, causes a shift in the detection angle, and causes the motor shaft to rotate. The vibration is generated in the rotation detector, so that the detection accuracy is lowered. Further, if this gap is made too small, the case column will be damaged when displacement more than the gap occurs.
Further, in order to absorb the displacement in the Z direction, it is necessary to keep the parallelism between the case column and the mounting body below the gap, which is a difficult task to perform at the installation site.
[0004]
The present invention has been made to solve the above-described problems. In particular, the present invention absorbs the displacement of the rotation detector that changes in accordance with the displacement of the motor shaft of the motor, and prevents a decrease in detection accuracy. An object of the present invention is to provide a rotation detector mounting structure.
[0005]
[Means for Solving the Problems]
The rotation detector mounting structure according to the present invention is a rotation detector mounting structure in which a support column for a case formed on a case of a rotation detector connected to a motor is supported by a fixedly arranged mounting body in an operable state. The mounting column of the mounting body has a circular cross section and is configured to be tiltable by a flange-shaped ball bearing unit that forms the mounting body, and the recess of the case column is biaxial with respect to the mounting column. It is the structure provided so that it could move freely.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a rotation detector mounting structure according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same or equivalent part as before.
In FIG. 1 to FIG. 4, reference numeral 1 denotes a rotation detector connected to the motor shaft 3 of the motor 2, and this rotation detector 1 is composed of a known resolver or encoder. The case support 5 formed on the case 4 of the container 1 is supported in a freely operable state by a fixedly arranged mounting body 6 on a fixed side (not shown).
[0007]
As shown in FIGS. 2 and 4, the case column 5 has a recess 5 a, and a mounting column 10 of an attachment body 6 fixedly arranged on a fixed side (not shown) is operable in the recess 5 a. It is mated.
The recess 5a is formed in the diametrical direction, and the mounting column 10 has a cylindrical (or column) cross-sectional shape as shown in FIG. It is integrally coupled to an inner ring 11a of a well-known flange-shaped ball bearing unit 11 that is configured. The recess 5a and the mounting column 10 have a vertical Y-direction shaft runout tolerance Y _K , a lateral X-direction shaft runout tolerance X _K , a Z-direction Z-axis axial runout tolerance Z _K and a flange. Due to the action of the ball bearing unit 11, the mounting column 10 is configured to freely tilt within a predetermined angle range θ in the 360-degree direction as the X-direction axial runout allowance X _K.
[0008]
Therefore, when the motor shaft 3 is displaced in the X, Y, and Z directions in the above-described configuration, the X-direction shaft runout allowance X _K and the Y-direction shaft runout allowance Y _K due to the tilting of the mounting column 10. Further, the displacement due to the shake in the three-axis directions is absorbed by the Z-direction axis shake allowance Z _K , and the rotation detector 1 is prevented from being swung, and a highly accurate rotation detection signal can be obtained.
[0009]
【The invention's effect】
Since the rotation detector mounting structure according to the present invention is configured as described above, the following effects can be obtained. That is, the flange-shaped ball bearing unit used for the rotation stopper has a function that the mounting support column tilts and rotates around the bearing center incorporated therein, so that when the motor shaft is displaced in the X direction, By tilting about the mounting column, a rotation stopping action is obtained, and the displacement of the motor shaft can be flexibly absorbed.
In addition, since the mounting post has a circular cross section, it can be installed ignoring the perpendicularity to the motor shaft end surface when installing the flange-type ball bearing unit, which is a rotation stopper, on the ground or on the base side. Is easier than before.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a rotation detector mounting structure according to the present invention.
FIG. 2 is a configuration diagram seen from the left side of FIG.
3 is a cross-sectional view taken along the line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is a configuration diagram showing a conventional configuration.
6 is a cross-sectional view taken along the line AA in FIG.
7 is a configuration diagram viewed from the left side of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotation detector 2 Motor 4 Case 5 Case support 5a Recess 6 Attachment body 10 Installation support

Claims (1)

Rotation in which the case support (5) formed on the case (4) of the rotation detector (1) connected to the motor (2) is supported by a fixedly mounted body (6) in an operable state. In the detector mounting structure, the mounting column (10) of the mounting body (6) has a circular cross section, and is configured to be tiltable by a flange-shaped ball bearing unit (11) forming the mounting body (6). A rotation detector mounting structure characterized in that the recess (5a) of the case column (5) is configured to be movable in two axial directions with respect to the mounting column (10).

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