JP4161365B2 - Encoder coupling device and motor with encoder using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary encoder / motor combination device, for example.
[0002]
[Prior art]
FIG. 3 shows a conventional encoder / motor coupling device (for example, Patent Document 1).
In FIG. 3, M is a motor such as a servo motor, and E is a rotary encoder, for example. Reference numeral 1 denotes a motor housing, and 2 a thermal insulator made of resin attached to the motor housing 1. 3 shaft of the motor M, the holo over the shaft of the encoder E which is fitted attached to the shaft 3 of the motor M, 5 is the shaft coupling screw for coupling the holo over shaft 4 of the shaft 3 and the encoder E of the motor M 4 It is. 6 is a encoder housing linked via the holo over shaft 4 and the bearing 7. 8A is an eccentric absorber that connects the motor housing and the encoder housing, and is constituted by a leaf spring. 9 is a rotating disk mounted on the holo over shaft.
In such a configuration, the holo over shaft 4 of the encoder E, the eccentric shaft 3 of the motor M, have been absorbed by the deformation of the plate spring 7 attached between the encoder housing 6 and the motor housing 1.
Further, the heat from the motor M is blocked by the thermal insulator 2 so that it is not transmitted to the encoder E, which is sensitive to heat.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 4-101268 [0004]
[Problems to be solved by the invention]
However, such conventional techniques have the following problems.
(1) The eccentricity of the encoder hollow shaft and the motor shaft is absorbed only by the leaf spring. However, the deformation is not uniform with a normal leaf spring, and stress is applied to the bearing.
(2) A deviation occurs between the rotation angles of the encoder hollow shaft and the motor shaft, causing a rotation error.
(3) In order to block the heat from the motor, it is necessary to provide a thermal insulator as a separate member, and the number of parts is large.
The present invention has been made to solve such a problem, and is a combination of encoders that can absorb the eccentricity between the shafts well and can well block the heat from the motor without providing a separate member. The object is to provide an apparatus.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention relates to an encoder coupling device that couples a hollow shaft of an encoder and a shaft of a motor and absorbs the eccentricity of each shaft with an eccentric absorber attached between the encoder housing and the motor housing. The eccentric absorber is formed on the end surface in the axial direction on the encoder side of the motor housing 1 so that the resin protrusion 11 passes through the center of the shaft 3 of the motor M, and the motor side of the intermediate member 10 A recess 12 for inserting and fitting the protrusion 11 is formed on the end surface in the axial direction, and a recess 13 is formed on the encoder side end surface of the intermediate member 10 so as to intersect the recess 12 at a right angle. while, on the end face in the axial direction of the motor side of the encoder housing 6, form a protrusion 14 to be inserted fitting into the recess 13 configuration Those were.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
FIG. 1 is a side sectional view showing an encoder coupling device according to an embodiment of the present invention. FIG. 2 is a perspective view showing an embodiment of the present invention.
Since the basic configuration of the motor M and the encoder E is the same as that of the prior art, description thereof is omitted. The present invention differs from the prior art in the configuration of the eccentric absorber 8.
The eccentric absorber 8 has a resin intermediate member 10 interposed between the motor housing 1 and the encoder housing 6, and the motor housing 1, the encoder housing 6 and the intermediate member 10 have an Oldham coupling shape. . That is, for example, a resin protrusion 11 is formed on the end surface of the motor housing 1 in the axial direction on the encoder side so as to pass through the center of the shaft 3 of the motor M, and the end surface of the intermediate member 10 in the axial direction on the motor side. In addition, a recess 12 for inserting and fitting the protrusion 11 is formed. A recess 13 is formed on the end surface of the intermediate member 10 in the axial direction on the encoder side so as to intersect the recess 12 at a right angle, and is inserted and fitted into the recess 13 in the end surface of the encoder housing 6 in the axial direction on the motor side. The protruding portion 14 is formed.
In assembling the encoder E into the motor M, the protrusion 11 of the motor housing 1 is inserted into the recess 12 of the intermediate member 10 and the protrusion 14 of the encoder housing 6 is inserted into the recess 13 of the intermediate member 10. Then, the motor housing 1 and the encoder housing 6 are assembled so as to sandwich the intermediate member 10.
In such a configuration, the holo over shaft 4 of the encoder E, the eccentricity of the motor M of the shaft 3, by projection 11 of the motor housing 1 slides in the recess 12 of the intermediate member 10, also the encoder housing As the six protrusions 14 slide in the recess 13 of the intermediate member 10, they are absorbed smoothly.
Further, since the intermediate member 10 is made of a resin having good thermal insulation, the heat of the motor M is hardly transmitted to the encoder E.
[0007]
【The invention's effect】
As described above, the present invention has the following effects.
(1) Unlike conventional leaf springs, the Oldham structure that slides in the XY direction can absorb the eccentricity of the encoder shaft and the motor shaft with high accuracy, and the rotational accuracy is greatly improved.
(2) Since the intermediate member is made of resin having good thermal insulation, it is possible to easily and inexpensively prevent the heat of the motor from being transmitted to the encoder without providing a separate thermal insulator. it can.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an encoder coupling device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a side sectional view showing an encoder coupling device in the prior art.
[Explanation of symbols]
M Motor E encoder 1 motor housing 2 thermal insulator 3 the shaft of the motor 4 encoder holo over the shaft 5 Shaft coupling screw 6 encoder housing 7 bearing 8,8A eccentric absorber 9 rotating disk 10 intermediate member 11 projection 12 recess 13 recess 14 Protrusion

Claims (2)

In an encoder coupling device that couples the hollow shaft 4 of the encoder E and the shaft 3 of the motor M and absorbs the eccentricity of the shafts 4 and 3 with an eccentric absorber 8 attached between the encoder housing 6 and the motor housing 1. ,
The eccentric absorber 8 is formed on the end surface of the motor housing 1 in the axial direction on the encoder side, and the resin protrusion 11 is formed so as to pass through the center of the shaft 3 of the motor M. A recess 12 for inserting and fitting the protrusion 11 is formed on the end surface in the axial direction, and a recess 13 is formed on the end surface in the axial direction on the encoder side of the intermediate member 10 so as to intersect the recess 12 at a right angle. In addition, the encoder coupling device is characterized in that a projecting portion 14 to be inserted and fitted into the concave portion 13 is formed on an end surface of the encoder housing 6 on the motor side in the axial direction . A motor with an encoder, wherein the encoder is coupled using the encoder coupling device according to claim 1.

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