JP2001286087A - Servomotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a servomotor which is small in size, enables a smooth attachment work of an encoder cover and prevents encoder lead wires from contact with the encoder cover and an encoder main part. SOLUTION: An encoder cover 11 is divided into two by a dividing part 12. A rotary encoder 16 is attached to a rotary shaft 16 first, a Cannon plug (R) 14 and the rotary encoder 13 are connected to each other with lead wires 15, the divided parts of the encoder cover 11 are integrated and then the Cannon plug (R) 14 is fixed to the side part of the encoder cover 11 with screws.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an encoder cover of a servomotor for extracting a signal of a rotary encoder from a connector such as a cannon plug.

[0002]

2. Description of the Related Art In recent years, the performance and accuracy of industrial robots, machine tools, semiconductor devices, mounting machines, and the like have been improved, and the resolution of rotary encoders and signal lines have been increased in servo motors as power sources. Are being reduced.

[0003] However, although the function is improved, the signal transmission system using a conventional lead wire is structurally followed. On the other hand, in parallel with the demand for miniaturization of the servo motor, space saving of the encoder section is progressing.

In particular, in the case of a large servomotor such as a robot to which excessive vibration is applied, there is a possibility that the lead wire of the rotary encoder may come into contact with the encoder cover and the parts of the rotary encoder body due to the vibration, so that the size cannot be reduced. Was.

In a conventional servo motor for extracting a signal from a rotary encoder from a cannon plug, a cannon plug with one end of a lead wire soldered is fixed to an encoder cover, and then the other end of the lead wire is soldered to a terminal portion of the rotary encoder. Attach. After that, it is necessary to assemble the rotary encoder to the servomotor. At this time, since the encoder cover is in the way, the work will not proceed smoothly unless the lead wire is set long. In some cases, the lead wire may break due to contact with the wire, and the lead wire may be thickened or covered with a protective tube to improve the strength of the lead wire.

[0006]

However, in the above-mentioned conventional structure, regardless of whether the lead wire comes into contact with the encoder cover or the encoder body, the lead wire or the protective tube is rubbed by external vibration, and wear powder is generated. The disconnection in the case of further progress could not be prevented.

Another problem is that the encoder cannot be downsized from the viewpoint of workability during mounting.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a small-sized servomotor which facilitates the workability when mounting a rotary encoder and an encoder cover and does not allow an encoder lead wire to contact an encoder cover or an encoder body. The purpose is to do.

[0009]

In order to solve the above-mentioned problems, the present invention provides an encoder cover for protecting a rotary encoder attached to a servomotor, and a connector such as a cannon plug attached to a side of the encoder cover. The encoder cover is divided into two or more, and the rotary encoder and the connector are connected to each other by a lead wire, and the divided encoder cover is integrated, so that the encoder unit can be downsized, and the rotary encoder and the encoder cover are attached. In addition, the workability at the time can be made smooth, and the encoder lead wire can be shortened, so that contact with the encoder cover and the encoder body can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above problems, the present invention comprises an encoder cover for protecting a rotary encoder attached to a servomotor, and a connector such as a cannon plug attached to a side of the encoder cover. The encoder cover is divided into two or more parts, and a rotary encoder and a connector are connected by a lead wire, and the divided encoder cover is integrated. And the connection work of the connector can be facilitated.

The servomotor according to claim 1, wherein the encoder cover is divided into two parts in the axial direction and integrated by abutment, and the lead wire connecting the rotary encoder and the connector can be shortened, so that the encoder part can be downsized. And contact with the encoder cover and the encoder body can be prevented.

The servo motor according to claim 1, wherein the encoder cover is divided into two parts vertically at the bottom in the axial direction and integrated by a screw or the like in an engagement relationship. Since the divided portions are provided with a screw or the like for engagement, the encoder cover can be easily integrated.

Further, the servo motor according to claim 1 or 2 uses a split type encoder cover for a large servo motor whose encoder cover is smaller than the servo motor main body, and the encoder section of the servo motor can be downsized. .

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, reference numeral 11 denotes an encoder cover;
3 is a rotary encoder, 14 is a connector, a cannon plug, 15 is a lead wire, 16 is a rotary shaft of a servomotor,
The motor body is omitted.

The encoder cover 11 is divided into two parts in the axial direction by a dividing part 12, and can be attached later.
The rotary encoder 13 is attached to the rotating shaft 16 first.

Then, the cannon plug 14 and the rotary encoder 13 are connected by a lead 15 and the encoder cover 11 is integrated, and then the cannon plug 14 is fixed to the side of the encoder cover 11 with screws.

As described above, the rotary encoder 13 can be easily attached to the rotary shaft 16, the lead 15 can be shortened, and the lead 15 can be prevented from coming into contact with the encoder cover 11 and the components of the rotary encoder 13. .

When the divided encoder covers are abutted and integrated, as shown in FIG. 2, if the divided surfaces are provided with irregularities and a liquid packing 21 serving as both a seal and an adhesive is applied, dust-proofing can be performed simultaneously with the integration. Waterproof measures can be taken.

Further, the connector is not limited to the cannon plug, but can be implemented similarly with a connector or the like.

(Embodiment 2) In FIG. 3, reference numeral 31 denotes an encoder cover, reference numeral 32 denotes a bottom portion of the encoder cover, and reference numeral 33 denotes a dividing portion, which divides the encoder cover 31 and the bottom portion 32 into two portions perpendicular to the axial direction. 13 is a rotary encoder, 14 is a connector, a cannon plug, 15 is a lead wire,
Reference numeral 16 denotes a rotary shaft of the servo motor.

The configuration other than the encoder cover is the same as that of the first embodiment.
Since the assembling work is slightly different, the method will be described.

First, the lead wire 15 is connected to the cannon plug 14.
To one end. Then, the cannon plug 14 with the lead wire is fixed to the side of the encoder cover 31 with a screw.

Next, the rotary encoder 13 is connected to the rotating shaft 1.
6 and cannon plug 1 with lead wire
4 is fixed to the servomotor. At this time, since the bottom 32 is absent, that is, the bottom 32 is open, the other end of the lead 15 can be connected to the rotary encoder 13 by soldering. Therefore, the lead wire can be shortened. Note that the lead wire 15 may be soldered to the rotary encoder 13 first, and then soldered to the cannon plug 14 later.

Finally, the bottom portion 32 is attached to the encoder cover 31. Since the bottom portion 32 and the divided portion 33 of the encoder cover 31 are engaged with each other, the bottom portion 32 can be easily attached.

Although not shown, as an example of the engagement relationship, a screw may be provided on both sides, a circumferential groove portion is provided inside the encoder cover, and a convex portion is provided on the outer peripheral portion of the bottom portion. May be. If a sealing material is applied to the groove, waterproof measures can be taken.

Further, if a split type encoder cover is used for a servomotor having a large motor output, the work of mounting the rotary encoder and wiring the rotary encoder and the connector can be improved, so that the encoder cover can be made smaller and the encoder section can be made smaller. it can.

Further, the length of the lead wire can be shortened, and contact can be prevented.

[0029]

As apparent from the above embodiments, according to the first and second aspects of the present invention, the encoder cover is divided, so that the rotary encoder can be mounted and the rotary encoder and the connector can be connected even if the encoder section is downsized. Wiring work can be improved, the lead wire can be shortened, and contact with other components can be prevented. Therefore, abrasion powder and disconnection due to contact of the lead wire can be prevented.

According to the third aspect of the present invention, it is possible to further easily integrate the divided encoder cover in addition to the above.

Further, according to the fourth aspect of the present invention, it is possible to reduce the size of the encoder section of a large servo motor, which contributes to the miniaturization of the servo motor.

[Brief description of the drawings]

FIG. 1A is a sectional view of an encoder unit according to a first embodiment of the present invention. FIG. 1B is a front view of an encoder unit according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of integration in Embodiment 1 of the present invention.

3A is a sectional view of an encoder unit according to a second embodiment of the present invention. FIG. 3B is a front view of the encoder unit according to a second embodiment of the present invention.

[Explanation of symbols]

 11, 31 Encoder cover 12, 33 Dividing part 13 Rotary encoder 14 Connector (cannon plug) 15 Lead wire 16 Rotary shaft 32 Bottom part

Claims (4)

[Claims] An encoder cover for protecting a rotary encoder attached to a servomotor, and a connector such as a cannon plug attached to a side of the encoder cover, wherein the encoder cover is divided into two or more, and a rotary encoder is provided. A servo motor, wherein the encoder cover is divided after connecting the connector and the connector with a lead wire. 2. The encoder cover is divided into two parts in the axial direction,
2. The servo motor according to claim 1, wherein the servo motor is integrated by butting. 3. The servo motor according to claim 1, wherein the encoder cover is vertically divided into two parts at the bottom in the axial direction, and integrated by a screw or the like. 4. The servo motor according to claim 1, wherein the split type encoder cover is used for a large-sized servomotor whose encoder cover is smaller than the servomotor body.