JP5929024B2 - ENCODER, ENCODER INSTALLATION METHOD, AND MOTOR DEVICE - Google Patents

Description

  The present invention relates to an encoder, an encoder mounting method, and a motor device.

  An encoder is known as a device that detects rotational information such as the rotational speed, rotational angle, and rotational position of a rotating body including a rotational shaft of a motor (Patent Document 1). The encoder is used by being attached to a rotating shaft of a motor, for example. As an example of an encoder, for example, a rotating part (disk) on which a predetermined light reflection pattern and a magnetic pattern are formed is rotated integrally with a rotation shaft, and for example, the light reflection pattern is irradiated with light to read the reflected light, For example, the rotation information of the rotation shaft of the motor can be detected by detecting the change of the magnetic pattern.

  In the encoder having the above-described configuration, the rotating unit and a main body unit including a detection unit that detects a change in reflected light or a magnetic pattern, for example, are formed separately. For this reason, when attaching an encoder to the rotating shaft of a motor, etc., a rotation part and a main-body part are attached separately. In this case, for example, if there is a deviation in the mounting position, the detection accuracy may decrease. Therefore, for example, after each unit is mounted between the rotating unit and the detection unit so as to obtain a predetermined detection accuracy. Positioning process such as position adjustment is performed.

JP 2004-20548 A

  However, since the position adjustment between the rotation unit and the detection unit uses, for example, a special tool or a signal adjustment device, the operation is complicated and takes time.

  In view of the circumstances as described above, it is an object of the present invention to provide an encoder, an encoder mounting method, and a motor device that can be mounted on a measurement target so that desired detection accuracy can be obtained in a short time.

  According to the first aspect of the present invention, there is a rotating part that has a pattern and is fixed to the rotor to be measured, a detecting part that detects the pattern, and a position restriction surface that is based on the rotor, An encoder is provided that includes a bearing portion that rotatably holds a rotor and a main body portion that is provided with an abutting portion that abuts against a position regulating surface.

According to the second aspect of the present invention, the rotating part fixing step of fixing the rotating part having the pattern to the rotor to be measured, and the bearing part for rotatably holding the rotor to the non-rotating part of the measuring object. A bearing unit mounting step for mounting on a fixed main body unit, a main body unit fixing step for fixing the main body unit to a measurement object while positioning using the bearing unit with respect to the rotor, and a detection unit for detecting a pattern. An encoder mounting method including a detecting unit fixing step for fixing to an encoder is provided.
According to a third aspect of the present invention, a rotor, a drive unit that rotates the rotor, and an encoder that is fixed to the rotor and detects position information of the rotor are provided. A motor device is provided in which the encoder according to the first aspect of the present invention is used.

  According to the aspects of the present invention, it is possible to provide an encoder, an encoder mounting method, and a motor device that can be mounted so that desired detection accuracy can be obtained in a short time.

Sectional drawing which shows the structure of the encoder and motor which concern on embodiment of this invention. FIG. 3 is a plan view showing a partial configuration of the encoder according to the present embodiment. FIG. 3 is a plan view showing a partial configuration of the encoder according to the present embodiment. FIG. 3 is an exploded perspective view showing a configuration of a part of the encoder according to the present embodiment. The figure which shows the attachment process of the encoder which concerns on this embodiment. The figure which shows the attachment process of the encoder which concerns on this embodiment. The figure which shows the attachment process of the encoder which concerns on this embodiment. The figure which shows the attachment process of the encoder which concerns on this embodiment. The figure which shows the other attachment process of the encoder which concerns on this embodiment. The figure which shows the other attachment process of the encoder which concerns on this embodiment. The figure which shows the other attachment process of the encoder which concerns on this embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a configuration of a motor device MTR having an encoder EC according to the present embodiment.
As shown in FIG. 1, the encoder EC is a device that detects rotational information such as the rotational speed, rotational angle, rotational position, and the like of a rotating body such as a rotational shaft 40 of a motor device MTR (measurement target). The motor device MTR includes a rotating shaft 40 that is rotationally driven by the drive mechanism 43 and a housing 41 that serves as a non-rotating portion that supports the rotating shaft 40.

  The encoder EC according to the present embodiment can detect the rotation information of the rotary shaft 40 by irradiating the light on the light reflection pattern to detect the reflected light and detecting the change in magnetism generated by the magnetic pattern. It has become. The encoder EC of the present embodiment includes a rotating part R, a main body part D, and a bearing part 60. FIG. 2 is a diagram illustrating a configuration of the rotating portion R, the main body portion D, and the motor device MTR in a plan view. Hereinafter, the configuration of the encoder EC will be described with reference to FIGS. 1 and 2.

  In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship of each member will be described with reference to this XYZ orthogonal coordinate system. Specifically, the axial direction of the rotating shaft 40 of the motor device MTR is the Z-axis direction, the predetermined direction on the plane orthogonal to the axial direction of the rotating shaft 40 is the X-axis direction, and the direction orthogonal to the X-axis direction on the plane. Is the Y-axis direction. Further, the rotation (inclination) directions around the X axis, Y axis, and Z axis are the θX, θY, and θZ directions, respectively. For example, the rotation direction of the rotation shaft 40 is the θZ direction.

  The rotating portion R is a portion that is fixed to the rotating shaft 40 of the motor device MTR using, for example, a fixing member 50 (for example, a screw) and is rotated integrally with the rotating shaft 40. The rotating part R includes a disk member 10 and a magnet member 20. The rotating part R is integrally fixed to the rotating shaft 40 by a fixing mechanism (not shown) such as a screw.

  The disk member 10 is a part that is directly attached to the rotary shaft 40. The disk member 10 is attached to the rotating shaft 40 so that the center when viewed in the Z direction coincides with the center of the rotating shaft 40 when viewed in the Z direction. The disk member 10 rotates in the θZ direction with the rotation of the rotating shaft 40. The disk member 10 is made of a highly rigid material such as SUS, and has excellent deformation resistance. Other materials may be used as the constituent material of the disk member 10.

  The disk member 10 has a mounting portion 11 and a pattern forming portion 12. The attachment portion 11 is provided to protrude toward the lower surface 10b side of the disk member 10, for example. The attachment portion 11 is formed with an insertion hole 11a at a central portion in plan view. The rotation shaft 40 of the motor device MTR is inserted into the insertion hole 11a. The rotating shaft 40 of the motor device MTR is fixed by the fixing mechanism (not shown) or the like while being inserted into the insertion hole 11a.

  The pattern forming part 12 is a disk-shaped part provided around the attachment part 11. A light reflection pattern 12 a is formed on the pattern forming unit 12. The light reflection pattern 12 a is formed in an annular region along the outer periphery of the disk member 10 on the upper surface 10 a of the disk member 10. The light reflection pattern 12a is formed using, for example, a light reflection member that reflects light having a predetermined wavelength.

  The magnet member 20 is a permanent magnet formed in an annular shape. The magnet member 20 is fixed to the upper surface 10a of the disk member 10 via, for example, an adhesive (not shown). The center position of the magnet member 20 as viewed in the Z direction coincides with the center position of the rotating shaft 40 and the disk member 10 as viewed in the Z direction. A predetermined magnetic pattern 20 a is formed on the magnet member 20.

  As the magnetic pattern 20a of the magnet member 20, for example, as shown in FIG. 2, the outer peripheral region of the half region of the magnet member 20 as viewed in the Z direction (for example, −X side in FIG. 2) is magnetized to the N pole. The inner peripheral region is magnetized to the S pole, and the other half region (for example, the + X side in FIG. 2) of the magnet member 20 is magnetized to the S pole. A configuration in which the peripheral region is magnetized in the N pole can be used. Of course, other forms may be adopted as the magnetic pattern 20a.

  The main body D is fixed to a housing 41 that is a non-rotating part of the motor device MTR. The main body D includes a detection substrate 30, a first cylindrical member (first portion) 33, a second cylindrical member (second portion) 34, and a control unit CONT.

  The control unit CONT obtains the rotation information of the rotation shaft 40 based on the output from the optical sensor 31 and performs the process of obtaining the rotation information of the rotation shaft 40 based on the output from the magnetic sensor 32. The rotation information includes information such as the number of rotations, the rotation direction, the rotation angle, and the rotation position of the rotation shaft 40, for example.

  The detection substrate 30 includes, for example, a plate-like base material 30 a formed in a circular shape in plan view, an optical sensor (detection unit) 31, and a magnetic sensor (detection unit) 32. The base material 30a is fixed to the first cylindrical member 33, the second cylindrical member 34, and the motor device MTR by, for example, three fixing members 51. Since the base material 30a is fixed to the motor device MTR, the relative position between the base material 30a and the motor device MTR does not change even when the rotating shaft 40 rotates. For example, a screw or the like is used as the fixing member 51. The fixing member 51 is attached so as to pass through the base material 30a, the second cylindrical member 34, and the first cylindrical member 33 so that the surface on the + Z side of the motor device MTR is not easily inserted.

  For example, the optical sensor 31 is disposed at a position overlapping the light reflection pattern 12a (optical pattern) when viewed in the Z direction. The optical sensor 31 has a light emitting unit and a light receiving unit (not shown). The optical sensor 31 is attached to, for example, the −Z side surface of the base material 30a. The optical sensor 31 is a part that detects the light reflection pattern 12a by emitting light from the light emitting unit toward the light reflection pattern 12a and reading the reflected light in the light receiving unit. The detection result is transmitted to the control unit CONT as an electrical signal.

  For example, two magnetic sensors 32 are provided at the center of the substrate 30a as viewed in the Z direction. The two magnetic sensors 32 each have a bias magnet (not shown) and a magnetoresistive element (not shown). The magnetic sensor 32 is arranged at a position shifted by 90 ° in the θZ direction, for example.

  The bias magnet forms a combined magnetic field with the magnetic field of the magnet member 20. As a material constituting the bias magnet, for example, a rare earth magnet having a large magnetic force such as samarium / cobalt can be cited. The bias magnet is disposed at a position that does not contact the magnetoresistive element and is not adjacent to the magnetoresistive element.

  The magnetoresistive element has two orthogonal repeating patterns formed by, for example, metal wiring. In the magnetoresistive element, the electric resistance decreases when the direction of the magnetic field is close to the direction perpendicular to the direction of the current flowing in the repetitive pattern. The magnetoresistive element converts the direction of the magnetic field into an electric signal by utilizing the decrease in electric resistance. The magnetoresistive element detects a combined magnetic field generated by the magnetic field of the magnet member 20 and the magnetic field of the bias magnet. The detection result is transmitted to the control unit CONT as an electrical signal.

  The first cylindrical member 33 is a part attached to the housing 41 of the motor device MTR. The first cylindrical member 33 is formed so as to surround the rotating portion R. The inner wall of the first cylindrical member 33 is formed so as not to contact the rotating portion R at least in a state where the encoder EC is attached to the rotating shaft 40 of the motor device MTR. The first cylindrical member 33 is fixed to the fixing surface 41 a of the housing 41 by, for example, a fixing member 52.

  The second cylindrical member 34 is a support member that supports the detection substrate 30. For example, the second cylindrical member 34 is disposed so as to overlap the first cylindrical member 33 in the Z direction. The second cylindrical member 34 is formed so as to surround the rotating portion R. The outer diameter, inner diameter, and height (dimension in the Z direction) of the second cylindrical member are formed to have the same dimensions as the outer diameter, inner diameter, and height of the first cylindrical member 33, for example. The inner wall of the second cylindrical member 34 is formed so as not to contact the rotating portion R at least in a state where the encoder EC is attached to the rotating shaft 40 of the motor device MTR. The + Z side end surface 33 s of the first cylindrical member 33 is configured to contact the −Z side end surface 34 s of the second cylindrical member 34.

FIG. 3 is an exploded perspective view showing configurations of the first cylindrical member 33 and the second cylindrical member 34. FIG. 4 is a diagram illustrating a positional relationship among the first cylindrical member 33, the bearing portion 60, and the rotation shaft 40.
As shown in FIG. 3, a convex portion 33 a is formed on the end surface 33 s of the first cylindrical member 33. For example, one protrusion 33a is formed on each end of the end surface 33s in the X direction. On the other hand, as shown in FIG. 4, a recess 34 a is formed on the end surface 34 s of the second cylindrical member 34. The concave portion 34a is formed at a position overlapping with the convex portion 33a in the Z direction. In a state where the end surface 33 s of the first cylindrical member 33 and the end surface 34 s of the second cylindrical member 34 are in contact, the convex portion 33 a of the first cylindrical member 33 is fitted into the concave portion 34 a of the second cylindrical member 34. For this reason, the 1st cylindrical member 33 and the 2nd cylindrical member 34 are latched between the convex part 33a and the recessed part 34a.

  On the end surface 33s of the first cylindrical member 33, for example, three fixing through portions 33b are formed. On the other hand, on the end surface 34s of the second cylindrical member 34, for example, three fixing through portions 34b are formed. The fixing penetrating portion 33b and the fixing penetrating portion 34b are formed at positions where the first cylindrical member 33 and the second cylindrical member 34 are communicated with each other in an overlapping state. The fixing member 51 is inserted into the fixing through portion 33b and the fixing through portion 34b.

  In the end surface 33 s of the first cylindrical member 33, a fixing through portion 33 c is formed separately from the above fixing through portion 33 b. For example, the fixing through portions 33c are arranged at two locations across the center of the cylinder. The fixing through portion 33 c is formed only in the first cylindrical member 33. For example, the fixing member 52 is inserted into the fixing through portion 33c.

  As shown in FIGS. 1, 2, and 4, the bearing unit 60 rotatably supports the rotating shaft 40. As the bearing portion 60, for example, a sliding bearing or a rolling bearing can be used.

  The bearing unit 60 is disposed between the casing 41 and the rotating unit R in the Z direction. Further, the bearing portion 60 is provided on the fixed surface 41 a of the housing 41, and is disposed with a gap between the rotating portion R and the bearing portion 60. Therefore, the bearing portion 60 is in contact with the housing 41 but is not in contact with the rotating portion R. The bearing unit 60 is disposed between the rotary shaft 40 and the first cylindrical member 33 in the radial direction of the rotary shaft 40.

  The bearing portion 60 has an annular outer shape. The bearing portion 60 has an outer peripheral surface 60a and an inner peripheral surface 60b, which are cylindrical surfaces. The diameter of the outer peripheral surface 60 a is substantially equal to the diameter of the inner peripheral surface 33 e of the first cylindrical member 33. For this reason, the outer peripheral surface 60 a is in contact with the inner peripheral surface 33 e of the first cylindrical member 33. That is, the outer peripheral surface 60a is in contact with the inner peripheral surface 33e over the entire circumference.

  The diameter of the inner peripheral surface 60 b is substantially equal to the diameter of the outer peripheral surface 40 a of the rotating shaft 40. For this reason, the inner peripheral surface 60 b is in contact with the outer peripheral surface 40 a of the rotating shaft 40. That is, the inner peripheral surface 60b is in contact with the outer peripheral surface 40a over the entire circumference.

  As described above, the bearing portion 60 has the outer peripheral surface 60 a in contact with the inner peripheral surface 33 e of the first cylindrical member 33, and the inner peripheral surface 60 b is in contact with the outer peripheral surface 40 a of the rotating shaft 40. Further, the bearing portion 60 is disposed so as to fill a gap formed between the rotating shaft 40 and the first cylindrical member 33. For this reason, the grease or dust of the fluid transmitted from the housing 41 to the rotating shaft 40 is restricted from flowing toward the rotating portion R by the bearing portion 60.

  Further, the movement of the rotating shaft 40 in the radial direction is regulated by the bearing portion 60 and the first cylindrical member 33 that contacts the bearing member 60. Thus, the bearing part 60 supports the rotating shaft 40 so that rotation is possible, and regulates the position of the rotating shaft 40 in the radial direction.

Next, a process of attaching the encoder EC configured as described above to the motor device MTR will be described.
First, as shown in FIG. 5, the bearing portion 60 is mounted inside the first cylindrical member 33. The bearing portion 60 is inserted into the first cylindrical member 33 so that the outer peripheral surface 60a of the bearing portion 60 and the inner peripheral surface 33e of the first cylindrical member 33 are in contact with each other. The cylindrical member 33 is integrated.

  Thereafter, the integrated bearing portion 60 and the first cylindrical member 33 are disposed on the fixed surface 41 a of the housing 41. At this time, the rotating shaft 40 is inserted into the bearing portion 60 so that the inner peripheral surface 60b of the bearing portion 60 and the outer peripheral surface 40a of the rotating shaft 40 are in contact with each other. Thereby, the bearing part 60 and the 1st cylindrical member 33 are attached with respect to the housing | casing 41 (bearing part attachment process).

  In the bearing part attaching step, for example, the bearing part 60 may be fitted to the rotary shaft 40 first, and then the first cylindrical member 33 may be fitted to the bearing part 60. Further, for example, after the first cylindrical member 33 is first disposed on the fixed surface 41 a, the bearing portion 60 may be disposed between the rotating shaft 40 and the first cylindrical member 33.

  In the bearing part attaching step, the bearing part 60 is supported by the rotating shaft 40. In this state, the inner peripheral surface 33e of the first cylindrical member 33 and the outer peripheral surface 60a of the bearing portion 60 are in contact with each other, thereby restricting the position of the first cylindrical member 33 on the fixed surface 41a.

  Thus, the outer peripheral surface 60 a of the bearing portion 60 is used as a position restricting surface that restricts the position of the first cylindrical member 33. Since the bearing portion 60 is supported by the rotating shaft 40 on the inner peripheral surface 60b, the position of the first cylindrical member 33 regulated by the outer circumferential surface 60a, which is a position regulating surface, is a position based on the rotating shaft 40. .

  Further, the inner peripheral surface 33e of the first cylindrical member 33 is used as an abutting portion that abuts on the outer peripheral surface 60a, which is a position regulating surface of the bearing portion 60, for example, over the entire circumference. In the present embodiment, the first cylindrical member 33 is disposed, for example, at a position where the central axis of the first cylindrical member 33 and the central axis of the rotary shaft 40 substantially coincide.

  After positioning the first cylindrical member 33, the first cylindrical member 33 is fixed (main body fixing step). For example, as shown in FIG. 6, the fixing member 52 is inserted into the fixing through portions 33 c provided at two places on the end surface 33 s of the first cylindrical member 33, and the first cylindrical member 33 and the housing 41 are fixed. .

  After the first cylindrical member 33 is fixed, the rotating portion R is fixed to the rotating shaft 40 (rotating portion fixing step). In the rotating part fixing step, for example, as shown in FIG. 7, the disk member 10 is attached to the rotating shaft 40 so that the rotating shaft 40 is inserted into the insertion hole 11 a of the disk member 10, and the disk member 10 is used using the fixing member 50. And the rotating shaft 40 are fixed.

  After fixing the rotation part R, the detection substrate 30 is attached to the first cylindrical member 33 (detection part fixing step). As shown in FIG. 8, for example, the detection substrate 30 and the second cylindrical member 34 are integrated in advance. In this case, the detection substrate 30 may be fixed to the second cylindrical member 34. Further, the fixing through portion 30b of the detection substrate 30 and the fixing through portion 34b of the second cylindrical member 34 are penetrated by the fixing member 51, and the detection substrate 30 and the second cylindrical member 34 are fixed. Instead, the positioning may be performed.

In the detection unit fixing step, as shown in FIG. 8, the second cylindrical member 34 is attached to the first cylindrical member 33 in a state where the detection substrate 30 and the second cylindrical member 34 are integrated. At this time, the first cylindrical member 33 and the second cylindrical member 34 can be positioned by fitting the convex portion 33 a of the first cylindrical member 33 into the concave portion 34 a of the second cylindrical member 34. After the second cylindrical member 34 is attached to the first cylindrical member 33, the detection substrate 30 and the second cylindrical member 34 are fixed to the first cylindrical member 33 by the fixing member 51, and the detection substrate 30 and the second cylindrical member are fixed. 34, the first cylindrical member 33 is fixed to the housing 41.
Through the above steps, the encoder EC is easily attached to the motor device MTR with high accuracy.

Next, the operation of the encoder EC attached to the motor device MTR will be described.
When the rotating shaft 40 of the motor device MTR rotates, the rotating portion R fixed to the rotating shaft 40 rotates integrally with the rotating shaft 40. About the main-body part D, since it is not connected or contacted to the rotating shaft 40, it maintains the stationary state without rotating.

  When the rotating part R rotates, the light reflection pattern 12a formed on the rotating part R moves in the rotating direction. The optical sensor 31 emits light to the moving light reflection pattern 12a, and detects the rotation information (eg, rotation angle) based on the light reflection pattern 12a by reading the reflected light.

  When the rotating part R rotates, the magnet member 20 bonded to the rotating part R also rotates. When the magnet member 20 rotates, the combined magnetic field of the magnetic field formed by the magnetic pattern 20a of the magnet member 20 and the magnetic field formed by the bias magnet changes periodically. The magnetic sensor 32 detects rotation information (eg, multi-rotation information) based on the magnet member 20 (rotation axis) by detecting the change in the combined magnetic field.

  As described above, the encoder EC according to the present embodiment includes the light reflection pattern 12a and the magnetic pattern 20a, the rotating portion R fixed to the rotation shaft 40 of the motor device MTR, the light reflection pattern 12a, and the magnetic pattern 20a. The optical sensor 31 and the magnetic sensor 32 that detect the rotation, the outer peripheral surface 60a (position regulating surface) with respect to the rotation shaft 40, a bearing portion 60 that rotatably holds the rotation shaft 40, and the outer peripheral surface 60a (position) Since the first cylindrical member 33 (main body portion) is provided with an inner peripheral surface 33e (contact portion) that is in contact with the regulating surface), the bearing portion is attached when the encoder EC is attached. Positioning between the rotating part R and the main part D can be performed using 60. Accordingly, it is possible to provide an encoder EC that can be mounted so that desired detection accuracy can be obtained in a short time.

  Further, in the above configuration, since the bearing portion 60 is provided, the rotating shaft 40 can be stably rotated, and fluid grease and dust from the motor device MTR can be prevented from flowing to the rotating portion R. it can. For this reason, positioning of the rotation part R and the main-body part D, stable rotation of the rotating shaft 40, and reduction of the influence of grease can be achieved by one component of the bearing part 60. Thereby, the encoder EC according to the present embodiment can reduce the component cost.

  In addition, the encoder EC mounting method according to the present embodiment includes a rotating unit fixing step of fixing the rotating unit R having the light reflection pattern 12a and the magnetic pattern 20a to the rotating shaft 40 of the motor device MTR, and rotating the rotating shaft 40. A bearing unit mounting step for mounting the bearing unit 60 to be held on the body unit D fixed to the housing 41 of the motor device MTR, and positioning using the bearing unit 60 on the basis of the rotating shaft 40 while the motor device MTR is positioned. The encoder includes a main body fixing step for fixing the main body portion D, and a detecting portion fixing step for fixing the optical sensor 31 and the magnetic sensor 32 for detecting the light reflection pattern 12a and the magnetic pattern 20a to the main body portion D. In the process of attaching EC, positioning between the rotating portion R and the main body portion D is performed by the bearing portion 60. It made. For this reason, it is not necessary to perform signal adjustment used for positioning the rotating portion R and the main body portion D. For this reason, the encoder EC according to the present embodiment does not need to perform signal adjustment or the like used for positioning the rotating portion R and the main body portion D. Thereby, the encoder EC according to the present embodiment can perform efficient maintenance.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the main body D has a configuration including two cylindrical members (the first cylindrical member 33 and the second cylindrical member 34). However, the configuration is not limited thereto, and for example, only one cylindrical member is used. You may have the structure which has. For example, as shown in FIG. 9, the detection substrate 30 may be directly fixed to the first cylindrical member 33 in the detection substrate fixing step. Before performing the detection substrate fixing step, the same steps as in the above embodiment are performed.

  For example, the concave portion 30 c is formed in the base material 30 a of the detection substrate 30 so as to correspond to the convex portion 33 a formed in the first cylindrical member 33. In the detection substrate fixing step, positioning is performed between the detection substrate 30 and the first cylindrical member 33 so that the convex portion 33 a is fitted into the concave portion 39 c of the detection substrate 30, and then the detection substrate 30 is used using the fixing member 51. And the first cylindrical member 33 may be fixed. According to such a configuration, when the detection board 30 is replaced, the encoder EC according to this embodiment can be detached and attached only to the detection board 30 with the first cylindrical member 33 fixed. Efficient maintenance can be done.

  In the above description, as a configuration for positioning the first cylindrical member 33 and the second cylindrical member 34 (or the detection substrate 30), for example, the convex portion 33a formed with the first cylindrical member 33 is replaced with the second cylinder. Although the configuration in which the first cylindrical member 33 and the second cylindrical member 34 are locked by being fitted in the concave portion 34a formed in the member 34 (or the concave portion 30c formed in the detection substrate 30) has been described as an example. It is not limited to this. For example, a concave portion may be formed on the first cylindrical member 33 and a convex portion may be formed on the second cylindrical member 34 (or the detection substrate 30).

  Further, as shown in FIG. 10, for example, the first cylindrical member 33 may have an annular engaging portion 33f along the circumferential direction. The outer peripheral surface of the engaging portion 33f is formed so as to have the same diameter as the inner peripheral surface of the second cylindrical member 34, for example. Thereby, the encoder EC according to the present embodiment can position the first cylindrical member 33 and the second cylindrical member 34 in the radial direction.

  The circumferential positioning is performed, for example, by inserting the fixing member 51 into the second cylindrical member 34 and causing the fixing member 51 to protrude from the end surface 34 s of the second cylindrical member 34. For example, when the second cylindrical member 34 is fitted in the first cylindrical member 33 while rotating in the circumferential direction, the fixing member 51 is inserted into the fixing through portion 33 b of the first cylindrical member 33. Thus, the encoder EC according to the present embodiment can easily perform positioning in the rotational direction.

  Further, as shown in FIG. 11, the encoder EC according to the present embodiment may have a configuration in which a positioning portion is provided in the second cylindrical member 34. As shown in FIG. 11, an annular engagement portion 34 f is provided at a position along the inner peripheral surface of the second cylindrical member 34. The outer peripheral surface of the engaging portion 34 f is formed to have substantially the same diameter as the inner peripheral surface 33 e of the first cylindrical member 33. Even in this case, positioning can be easily performed between the first cylindrical member 33 and the second cylindrical member 34. When the engaging portion 34f is provided on the second cylindrical member 34, the dimension of the engaging portion 34f in the Z direction is set so that the −Z side end portion of the engaging portion 34f does not press the bearing portion 60. deep.

  Note that the configuration of the engaging portion 33f is not limited to the annular configuration as described above as long as positioning is possible by contacting the inner peripheral surface of the second cylindrical member 34, and other configurations may be used. Absent. For example, a configuration may be adopted in which the first cylindrical member 33 is disposed with an interval along the inner peripheral surface 33e. The same description can be applied to the configuration of the engaging portion 34f. In addition, the encoder EC and the motor device MTR according to the present embodiment, for example, provide a clearance between the bearing portion 60 and the first cylindrical member 33 or a clearance between the bearing portion 60 and the rotating shaft 40 with a rubber system. It can be sealed using a silicon-based elastic adhesive. With this sealing, the encoder EC and the motor device MTR according to the present embodiment can reduce the ingress of fluid grease and dust to the rotating portion R side and the like, and can reduce the vibration caused by the rotating shaft 40.

EC ... Encoder MTR ... Motor device R ... Rotating part D ... Main body part 10 ... Disk member 30 ... Detection board 33 ... First cylindrical member 33s ... End face 33a ... Convex part 33b ... Fixing penetration part 33c ... Fixing penetration part 33e ... Inner peripheral surface 33f ... engaging portion 34 ... second cylindrical member 40 ... rotating shaft 60 ... bearing portion 60a ... outer peripheral surface 60b ... inner peripheral surface

Claims (14)

A rotating part having a pattern and fixed to the rotor to be measured;
A detection unit for detecting the pattern;
A bearing portion having a position regulating surface based on the rotation axis of the rotor, and rotatably holding the rotor;
A contact portion that is in contact with the position restricting surface is provided, and is positioned in the radial direction of the rotating shaft by the position restricting surface and the contact portion, and is fixed to a non-rotating portion of the measurement target. Members,
A second member connected to the first member and having the detection unit fixed thereto;
A positioning portion that is provided on the first member or the second member with respect to the rotation shaft, and that positions the first member and the second member in a radial direction of the rotation shaft;
An encoder comprising: The first member is a cylindrical member;
The encoder according to claim 1, wherein a central axis of the first member substantially coincides with a central axis of the rotating shaft. The second member is a cylindrical member;
The encoder according to claim 1 or 2, wherein a central axis of the first member and a central axis of the second member substantially coincide with each other. The encoder according to any one of claims 1 to 3, wherein the positioning portion includes an engaging portion that locks the first member and the second member. The encoder according to any one of claims 1 to 4, wherein the bearing portion is held by the first member. One of the first member and the second member is formed with a recess as the positioning portion,
A convex portion corresponding to the concave portion is formed as the positioning portion on the other of the first member and the second member,
The encoder according to any one of claims 1 to 5, wherein the first member and the second member are joined in a state where the convex portion is inserted into the concave portion. The encoder according to any one of claims 1 to 6, wherein the bearing portion is disposed between the rotation shaft and the first member or the second member in a radial direction of the rotation shaft. The encoder according to any one of claims 1 to 7, wherein the bearing portion has an annular shape, and an inner peripheral surface of the bearing portion is in contact with an outer peripheral surface of the rotating shaft. The first member is a cylindrical member, the bearing portion is annular, and the diameter of the inner peripheral surface of the first member is substantially equal to the diameter of the outer peripheral surface of the bearing portion.
  The encoder according to claim 1. The second member is a cylindrical member, and the diameter of the inner peripheral surface of the second member is substantially equal to the diameter of the inner peripheral surface of the first member.
  The encoder according to claim 9. A bearing part attaching step of attaching a bearing part that has a position regulating surface with respect to a rotor to be measured as a reference and that rotatably holds the rotor to a first member that is fixed to a non-rotating part of the object to be measured;
A first member fixing step of performing positioning using the bearing portion and fixing the first member to a non-rotating portion of the measurement object;
A rotating part fixing step of fixing a rotating part having a pattern to the rotor;
A second member fixing step in which the second member to which the detection unit for detecting the pattern is fixed is connected to and fixed to the first member by the first member or the positioning unit provided in the second member;
A method of installing an encoder including: The encoder mounting method according to claim 11, wherein the first member fixing step includes inserting the rotor into the first member provided integrally with the bearing portion. In the second member fixing step, a convex portion corresponding to the concave portion formed in the other of the first member and the second member is formed in the concave portion formed in one of the first member and the second member. The method for attaching an encoder according to claim 11 , comprising inserting the encoder. A rotor,
A drive unit for rotating the rotor;
An encoder fixed to the rotor and detecting position information of the rotor,
As the encoder, the motor device encoder is used as claimed in any one of claims 1 to 10.

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