JP4857785B2 - Motor with encoder and assembly method thereof - Google Patents

Description

  The present invention relates to a motor with an encoder and a method for assembling the same, and more particularly to a motor with an encoder provided with an encoder module in which a light emitting element and a light receiving element are arranged to face each other with an encoder wheel interposed therebetween. .

  Conventionally, in this kind of motor 1 with an encoder, as shown in FIG. 3, the encoder module 2 is formed in a U-shape having a gap, and the light emitting element 3 and the light receiving element 4 are mutually attached on both side surfaces sandwiching the gap. Opposed to each other. The encoder module 2 is attached to a base member 5 provided on the end face side of the motor case 1a. An encoder wheel 8 is mounted and fixed to the end of the motor shaft 6 protruding from the end surface of the motor case 1a by a hub member 7. A plurality of light transmitting portions and light shielding portions are alternately arranged in the rotation direction on the outer portion of the encoder wheel 8.

The outer portion of the encoder wheel 8 is disposed in the gap between the light emitting element 3 and the light receiving element 4. Accordingly, as the encoder wheel 8 rotates together with the motor shaft 6, the light beam emitted from the light emitting element 3 passes through the light transmitting portion of the encoder wheel 8 and is incident on the light receiving element 4 intermittently. An electric signal is generated so that the number of rotations of the motor 1 can be detected (for example, see FIG. 6 of Patent Document 1).
JP-A-62-293143

  In the motor 1 with an encoder described in Patent Document 1, an outer peripheral portion of the encoder wheel 8 is disposed between the light emitting element 3 and the light receiving element 4 of the encoder module 2 formed in a U-shape. For this reason, when the encoder module 2 is incorporated into the base member 5 provided on the motor end surface portion, the encoder module 2 is attached to the base member 5 in a state where the outer peripheral side portion of the encoder wheel 8 is disposed in the gap portion of the encoder module 2. At the same time, the encoder wheel 8 is assembled to the motor shaft 6. Thus, since it is necessary to assemble the encoder module 2 and the encoder wheel 8 to the base member 5 and the motor shaft 6 respectively, there is a problem that the assembling manufacturability of the encoder module 2 and the encoder wheel 8 is not good.

  In particular, it is necessary to incorporate the encoder wheel 8 in a predetermined position with respect to the encoder module 2. However, since this position adjustment is difficult, misalignment may be caused, and the product yield cannot be improved. In addition, the encoder module 2 and the encoder wheel 8 are integrally held by a dedicated holding jig at the time of assembling. In this case, considerable skill is required and the number of assembling steps increases. As a result, the productivity of parts assembly cannot be improved.

  Therefore, there is a technical problem to be solved in order to improve the assembling property (productivity) of the encoder module and the encoder wheel, and to improve the product yield, and the present invention solves the problem. Objective.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 includes a base member provided on an end surface of a motor case and an encoder wheel attached to a motor shaft protruding from the base member. When, a with an encoder motor comprising an encoder module formed by opposed to the light emitting element and the light receiving element across the encoder wheel,
The light emitting element and the light receiving element are configured to be separated and independent from each other, and either one of the light emitting element or the light receiving element is attached to the base member, and the other of the light emitting element or the light receiving element has a bracket. in the motor with an encoder that is attached to the base member through,
The base member is a circuit board on which either the light emitting element or the light receiving element is mounted,
The bracket is supported by a conduction pin having one end electrically connected to one of the light emitting element or the light receiving element, and the other end of the conduction pin is inserted into a pin hole provided in the base member. It is inserted and fixed by soldering,
Thus, when the bracket is attached to a predetermined position of the base member, the light emitting element or the light receiving element fixed to the tip side portion of the bracket is positioned at a predetermined upper position with respect to the encoder wheel and the light receiving element or the encoder wheel and the light emitting element. A motor with an encoder is provided.

  According to this configuration, since the light receiving element and the light emitting element are configured separately from each other, either the light emitting element or the light receiving element, the encoder wheel, and the other one of the light receiving element or the light emitting element in this order. It is assembled. For example, when the light receiving element, the encoder wheel, and the light emitting element are assembled in this order, the light receiving element is first attached to the base member, and then the encoder wheel is disposed on the upper side of the light receiving element. Thereafter, a light emitting element is disposed on the upper side of the encoder wheel, and the light emitting element is attached to the base member via a bracket. Thus, the light emitting element and the light receiving element are assembled so as to face each other with the encoder wheel interposed therebetween.

  According to this configuration, the circuit board on which the light emitting element or the light receiving element is mounted functions as a base member, and there is no need to separately provide a dedicated base plate.

  According to this configuration, the other end portion of the conduction pin that supports the bracket is fitted and fixed to a pin hole provided at a predetermined position on the base member side, thereby aligning the bracket with respect to the base member, that is, a light receiving element ( Alternatively, the light emitting element (or the light receiving element) is automatically positioned with respect to the light emitting element) and the encoder wheel.

According to a second aspect of the present invention, a base member provided on an end surface of the motor case, an encoder wheel attached to a motor shaft protruding from the base member, and a light emitting element and a light receiving element are disposed opposite to each other with the encoder wheel interposed therebetween. An encoder module including the encoder module , wherein the light emitting element and the light receiving element are configured to be separated and independent from each other, and one of the light emitting element or the light receiving element is attached to the base member, The other of either the light emitting element or the light receiving element is a motor with an encoder attached to the base member via a bracket, and the base member mounts either the light emitting element or the light receiving element. And one end of the bracket is electrically connected to either the light emitting element or the light receiving element. The other end of the conduction pin is inserted into a pin hole provided in the base member and fixed by soldering, and thus the bracket is fixed at a predetermined position of the base member. In the assembling method of the motor with an encoder, the light emitting element or the light receiving element fixed to the front end side portion of the bracket is assembled at a predetermined upper position with respect to the encoder wheel and the light receiving element or the encoder wheel and the light emitting element . ,
Attaching one of the light emitting element or the light receiving element to the base member;
Attaching the encoder wheel to the motor shaft from the upper surface of the motor shaft such that the encoder wheel is disposed on the upper side of one of the light emitting element or the light receiving element attached on the base member;
Attaching either the light receiving element or the light emitting element to the base member via a bracket so that the other of either the light receiving element or the light emitting element is disposed on the upper side of the encoder wheel,
Provided is a method for assembling a motor with an encoder, which is formed so that the encoder wheel is smoothly inserted between the light emitting element and the light receiving element and can be attached to the motor shaft.

According to this configuration, for example, when the light receiving element, the encoder wheel, and the light emitting element are assembled in this order, after the light receiving element is directly mounted on the base member, the encoder wheel is placed on the upper side of the light receiving element mounted on the base member. The encoder wheel is attached to the motor shaft from the top surface of the motor shaft so that it is arranged. Next, the light emitting element is attached to the base member via a bracket so that the light emitting element is disposed on the upper side of the encoder wheel. Thus, the encoder wheel is smoothly inserted between the light emitting element and the light receiving element and is fixedly mounted on the motor shaft.

  According to the first aspect of the present invention, the light receiving element and the light emitting element of the encoder module are assembled separately and independently from each other. Therefore, the assembly and alignment of the encoder module and the encoder wheel are facilitated and the product yield is improved as compared with the conventional structure. As well as improving, the assembly man-hour is reduced and the productivity is improved. Furthermore, since the light receiving element and the light emitting element are assembled separately from each other, there is an advantage that the degree of freedom in design is increased.

This invention, since the circuit board of the light emitting element or the light receiving element also serves as the base member, in addition to the above effects, the number of parts is reduced, cost can be reduced structure is simplified.

This invention has the conductive pins of the bracket side only fitted fixed to pin holes in the base member side, the light-receiving element, since the positioning of the light emitting element and the encoder wheel is completed, in addition to the effects, special Even if a positioning mechanism is not provided, accurate positioning can be performed automatically.

This invention, for example, light receiving elements of the encoder module (or a light emitting device), the encoder wheel, and by mounting separate independently in the order of the light emitting element (or light receiving elements), the encoder wheel between the light emitting element and a light receiving element Since it is smoothly inserted and fixed to the motor shaft, the encoder module and the encoder wheel can be easily assembled, the product yield can be improved, and the number of assembling steps can be reduced.

  The present invention relates to an encoder module comprising a base member provided on an end surface of a motor case, an encoder wheel attached to a motor shaft protruding from the base member, and a light emitting element and a light receiving element disposed opposite to each other across the encoder wheel. The light emitting element and the light receiving element are configured to be separated and independent from each other, and one of the light emitting element or the light receiving element is attached to the base member, and The other of the light receiving elements is attached to the base member via a bracket, thereby improving the assembly and productivity of the encoder module and the encoder wheel, and improving the positioning accuracy and improving the product yield. Achieved the goal of

  An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, in a motor with an encoder that is fixed to a base member provided with an encoder module on an end surface of a motor case and the motor shaft passes through the base member, the light emitting element of the encoder module is connected to the base member. Although the light receiving elements are independently mounted and applied to the light receiving element, the encoder wheel, and the light emitting element in this order, the present invention can be applied to any motor provided with an encoder module.

FIG. 1 is an explanatory diagram illustrating a motor 10 with an encoder according to the present embodiment. In the figure, 11 is a motor case, 12 is a motor shaft, and a base member 13 is provided on one end surface of the motor case 11 in the motor axial direction. 13 protrudes by a predetermined dimension. An encoder wheel 14 is coaxially attached to the protruding portion of the motor shaft 12, and a plurality of light transmitting portions (slit portions) and light shielding portions are alternately arranged in the rotation direction on the outer peripheral side portion of the encoder wheel 14. . In the present embodiment, the encoder wheel 14 is attached to the protruding portion of the motor shaft 12 in a press-fit state, and is firmly fixed by hub members 15 attached to the upper and lower sides of the encoder wheel 14.

  The base member 13 is provided with an optical encoder module 16, and the encoder module 16 includes a light receiving element (PD-IC) 17 and a light emitting element (LED) 18. Here, the base member 13 is composed of a circuit board on which the light receiving element 17 is mounted. Further, the light emitting element 18 and the light receiving element 17 are respectively disposed on the upper side and the lower side of the encoder wheel 14, but unlike the conventional integrated configuration, the light emitting element 18 and the light receiving element 17 are separated and independent from each other. It is configured separately.

  In this embodiment, the light receiving element 17 is directly attached to the base member 13, whereas the light emitting element 18 is attached to the base member 13 through a resin bracket 19 that also serves as a casing. A preferred specific structure example of the mounting portion is shown in FIG. In this illustrated example, the bracket 19 is formed in a substantially L shape, and includes a proximal end portion perpendicular to the base member 13 and a distal end portion connected perpendicularly to the proximal end portion. The tip side portion is disposed in parallel to the base member 13.

  The bracket 19 is supported by a metal conduction pin 20, and the conduction pin 20 serves as both a conduction pin and a mounting pin here. That is, in FIG. 2, the upper end portion of the conduction pin 20 is electrically connected to the light emitting element 18 by being soldered to, for example, a jumper wire of the light emitting element side circuit board 22. The lower end portion of the conduction pin 20 is inserted and fitted into a pin hole 21 formed at a predetermined position of the base member 13 and fixed. Note that the lower end side of the conduction pin 20 is electrically connected to a drive circuit (not shown).

  The emission part of the light emitting element 18 is exposed from a circuit board 22 fixed to the lower surface of the bracket 19 on the tip side. Further, an outer peripheral portion of the encoder wheel 14 is disposed between the light emitting element 18 and the light receiving element 17. Thus, when the encoder wheel 14 is rotated together with the motor shaft 12, the light emitted from the light emitting element 18 passes through the light transmitting portion of the encoder wheel 14 and enters the light receiving element 17. By being converted into a sensor signal by a connected signal detection circuit (not shown), the rotation speed, rotation amount, etc. of the motor 10 can be detected. Reference numeral 23 in FIG. 1 denotes a connector.

  In the motor 10 with an encoder, the light receiving element 17 and the light emitting element 18 of the encoder module 16 are separated and independent from each other, so that the light receiving element 18, the encoder wheel 14, and the light emitting element 18 can be assembled in this order. That is, an example of the assembly procedure of the encoder module 16 and the encoder wheel 14 will be described. First, the light receiving element 17 is soldered and fixed to a predetermined position of the base member 13.

  Next, the encoder wheel 14 is mounted and press-fitted into the motor shaft 12 from above in the axial direction so that the encoder wheel 14 is disposed above the light receiving element 17 attached to the base member 13, and the hub member 15 is used to firmly press the shaft. Fix it. Thereafter, the light emitting element 18 is fixed to the front end portion of the substantially L-shaped bracket 19, and then the bracket 19 is attached to the base member 13, so that the light emitting element 18 is positioned on the upper side of the encoder wheel 14 and assembled.

When the bracket 19 is attached to the base member 13, the lower end portion of the conduction pin 20 on the bracket 19 side is fitted into a pin hole 21 drilled at a predetermined position of the base member 13 and fixed by soldering. Thus, when the bracket 19 is attached to a predetermined position of the base member 13, the light emitting element 18 fixed to the tip side portion of the bracket 19 is assembled at a predetermined upper position with respect to the encoder wheel 14 and the light receiving element 17. It is done.

  As described above, in this embodiment, the light receiving element 17 and the light emitting element 18 are provided separately from each other, and when assembled, the light receiving element 17 is fixed to the base member 13 and then the encoder wheel 14 is attached to the light receiving element 17. It is attached to the motor shaft 12 so as to be positioned on the upper side, and the light emitting element 18 is assembled so as to be positioned on the upper side of the encoder wheel 14.

  Therefore, since the light receiving element 17, the encoder wheel 14, and the light emitting element 18 can be sequentially and reliably assembled, the encoder module 16 and the encoder wheel 14 can be assembled very easily as compared with the conventional simultaneous assembly method. Therefore, in the motor 10 according to the present embodiment, the quality performance of the encoder is improved with the ease of component assembly.

  In particular, since the light receiving element 17 and the light emitting element 18 separated from each other can be incorporated independently, the degree of freedom in designing the encoder module 16 is increased, and a special holding jig is used as in the prior art. There is no need, and it has the merit of reducing assembly man-hours.

  Further, the conductive pin 20 on the bracket 19 side is fitted and fixed in the pin hole 21 on the base member 13 side, whereby the light emitting element 18 is accurately positioned with respect to the light receiving element 17 automatically. Further, since the fitting portions of the conductive pins 20 and the pin holes 21 are fixed by soldering, the fixing strength between the substantially L-shaped bracket 19 and the base member 13 is further increased, and the vibration resistance performance is improved. To do.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones. For example, in the above embodiment, the light receiving element 17 is directly attached to the base member 13, and the light emitting element 18 is attached to the base member 13 via the bracket 19, but conversely, the light emitting element 18 is attached to the base member 13. In addition to the direct attachment, the light receiving element 17 can be attached to the base member 13 via the bracket 19.

The front view of the motor with an encoder which shows one Example of this invention. Sectional drawing which shows the attachment structural example of the encoder part which concerns on one Example. The front view of the conventional motor with an encoder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motor with encoder 11 Motor case 12 Motor shaft 13 Base member 14 Encoder wheel 15 Hub member 16 Encoder module 17 Light receiving element (PD-IC)
18 Light Emitting Element (LED)
19 Bracket 20 Conduction pin (connector pin)
21 Pin hole 22 Circuit board

Claims (2)

A base member provided on an end surface of the motor case, an encoder wheel attached to a motor shaft protruding from the base member, and an encoder module in which a light emitting element and a light receiving element are arranged to face each other across the encoder wheel. A motor with an encoder,
The light emitting element and the light receiving element are configured to be separated and independent from each other, and either one of the light emitting element or the light receiving element is attached to the base member, and the other of the light emitting element or the light receiving element has a bracket. in the motor with an encoder that is attached to the base member through,
The base member is a circuit board on which either the light emitting element or the light receiving element is mounted,
The bracket is supported by a conduction pin having one end electrically connected to one of the light emitting element or the light receiving element, and the other end of the conduction pin is inserted into a pin hole provided in the base member. It is inserted and fixed by soldering,
Thus, when the bracket is attached to a predetermined position of the base member, the light emitting element or the light receiving element fixed to the tip side portion of the bracket is positioned at a predetermined upper position with respect to the encoder wheel and the light receiving element or the encoder wheel and the light emitting element. A motor with an encoder, characterized in that it is assembled to the motor.   A base member provided on an end surface of the motor case, an encoder wheel attached to a motor shaft protruding from the base member, and an encoder module in which a light emitting element and a light receiving element are arranged to face each other across the encoder wheel. A motor with an encoder, wherein the light emitting element and the light receiving element are configured to be separated and independent from each other, and one of the light emitting element or the light receiving element is attached to the base member; The other of which is a motor with an encoder attached to the base member via a bracket,
The base member is a circuit board on which either the light emitting element or the light receiving element is mounted, and the bracket is a conduction pin whose one end is electrically connected to one of the light emitting element or the light receiving element. The other end of the conductive pin is inserted into a pin hole provided in the base member and fixed by soldering, and thus a bracket is attached to a predetermined position of the base member. Thus, in the assembly method of the motor with an encoder, the light emitting element or the light receiving element fixed to the tip side portion of the bracket is assembled at a predetermined upper position with respect to the encoder wheel and the light receiving element or the encoder wheel and the light emitting element.
Attaching one of the light emitting element or the light receiving element to the base member;
Attaching the encoder wheel to the motor shaft from the upper surface of the motor shaft such that the encoder wheel is disposed on the upper side of one of the light emitting element or the light receiving element attached on the base member;
Attaching either the light receiving element or the light emitting element to the base member via a bracket so that the other of either the light receiving element or the light emitting element is disposed on the upper side of the encoder wheel,
A method of assembling a motor with an encoder, wherein the encoder wheel is smoothly inserted between the light emitting element and the light receiving element so that the encoder wheel can be attached to the motor shaft.

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