CN219960302U

CN219960302U - Connection structure, encoder and motor

Info

Publication number: CN219960302U
Application number: CN202321624552.0U
Authority: CN
Inventors: 孙登晔; 周溪; 彭玉礼; 胡森; 林炜彬
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Priority date: 2023-06-25
Filing date: 2023-06-25
Publication date: 2023-11-03
Anticipated expiration: 2033-06-25

Abstract

The utility model relates to a connecting structure, an encoder and a motor, and relates to the technical field of motors. The connecting structure comprises a supporting piece, a shaft sleeve and a limiting piece; the shaft sleeve is rotationally arranged in the supporting piece and is used for being connected with an output shaft of the motor; the limiting piece is arranged in the shaft sleeve and is used for being abutted with the end face of the output shaft of the motor. The technical scheme disclosed by the utility model can ensure that the encoder and the motor shaft synchronously rotate, and improve the working performance and measurement accuracy of the encoder.

Description

Connection structure, encoder and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a connecting structure, an encoder and a motor.

Background

The motor is an electromagnetic device for converting or transmitting electric energy according to the law of electromagnetic induction, and in order to realize various controls on the speed, the position and the torque of the motor, an encoder is arranged on the motor so as to be used for acquiring the rotating speed and the position information of the motor.

The encoder is a high-precision sensor for measuring angular displacement and angular velocity, has the advantages of high resolution, good working reliability and the like, and the quality level and precision of an output signal of the encoder are determined by the assembly structure of the encoder and the motor. At the rotation initiation of the motor shaft, the assembly structure of the existing encoder and the motor shaft can not ensure the synchronous rotation of the shaft sleeve of the encoder and the motor shaft, so that the rotation of the shaft sleeve of the encoder is delayed from the rotation of the motor shaft, and the measurement accuracy of the encoder is affected.

Disclosure of Invention

The embodiment of the utility model provides a connecting structure, an encoder and a motor, which can ensure that a shaft sleeve of the encoder and a motor shaft synchronously rotate, and improve the working performance and measurement accuracy of the encoder.

In a first aspect, an embodiment of the present utility model provides a connection structure, including:

a support;

the shaft sleeve is rotationally arranged on the supporting piece and is used for being connected with an output shaft of the motor; and

and the limiting piece is arranged on the shaft sleeve and is used for being abutted with the end face of the output shaft of the motor.

The limiting part is arranged to limit the output shaft of the motor, and the shaft sleeve and the output shaft of the motor always synchronously rotate by utilizing the friction force between the limiting part and the end face of the output shaft of the motor, so that the measuring precision of the encoder is ensured.

In one embodiment, the inner wall of the shaft sleeve is provided with a first thread part which is used for being matched and connected with a second thread part on the output shaft of the motor; wherein, the locating part is located the terminal surface of first screw thread portion.

The shaft sleeve is assembled with the output shaft of the motor in a threaded connection mode, so that coaxiality precision of the encoder and the output shaft of the motor is guaranteed, and working performance and measurement precision of the encoder are improved.

In one embodiment, the inner diameter of the stop is smaller than the inner diameter of the sleeve.

Therefore, a step surface is formed between the limiting piece and the shaft sleeve, and a structural foundation is provided for the abutting connection of the end surface of the output shaft of the motor and the end surface of the shaft sleeve.

In one embodiment, an annular groove is formed in the inner wall of the shaft sleeve, and the limiting piece is partially arranged in the annular groove.

The annular groove is arranged to provide a structural foundation for the installation of the limiting piece.

In one embodiment, the stop is a nylon stop.

By limiting the nylon limiting piece to serve as the limiting piece, friction force between the limiting piece and an output shaft of the motor is increased, synchronous rotation of the shaft sleeve and the output shaft of the motor is guaranteed, and therefore measuring accuracy of the encoder is improved.

In one embodiment, the support member is provided with an assembly hole coaxially arranged with the shaft sleeve, the connecting structure comprises a bearing assembly arranged in the assembly hole, and the shaft sleeve is rotatably connected with the support member through the bearing assembly.

The impact resistance and stability of the encoder are improved by arranging the bearing assembly, so that the encoder can still stably feed back signals under the working condition of large interference.

In one embodiment, the bearing assembly comprises at least one bearing comprising an outer race and an inner race rotatable relative to the outer race, the inner race being coupled to an outer wall of the sleeve;

the outer ring is in threaded connection with the supporting piece, and an adhesive layer is arranged between the outer threaded portion of the outer ring and the inner threaded portion of the supporting piece so as to adhere the outer ring and the supporting piece.

Through bearing and support piece threaded connection, not only can guarantee the axiality precision of bearing assembly, still utilize the screw thread of screw thread portion as the accommodation space of adhesive linkage, provide structural basis for the adhesive linkage.

In one embodiment, at least one bearing chamber is arranged on the hole wall of the assembly hole, the at least one bearing chamber corresponds to the at least one bearing one by one, and the bearing is arranged in the corresponding bearing chamber.

By providing a bearing chamber, a structural basis is provided for the assembly of the bearing on the support.

In one embodiment, the sleeve comprises:

the main body part is rotationally connected with the supporting piece through the bearing assembly; and

a base, one end of which is connected with the main body part;

the minimum width of the cross section of the base is larger than the outer diameter of the main body part, so that a step surface which is abutted with the bearing assembly is formed.

The minimum width of the cross section of the base is smaller than the outer diameter of the main body part, so that the limiting effect is achieved for the shaft sleeve in the assembly process.

In a second aspect, embodiments of the present utility model provide an encoder comprising a connection structure as described above.

In a third aspect, embodiments of the present utility model provide an electric machine comprising an encoder as described above.

Compared with the prior art, the embodiment of the utility model has the advantages that the limiting piece is arranged to limit the output shaft of the motor, and the shaft sleeve and the output shaft of the motor always synchronously rotate by utilizing the friction force between the limiting piece and the end face of the output shaft of the motor, so that the condition that the shaft sleeve cannot synchronously rotate with the output shaft of the motor in the initial rotation of the output shaft of the motor is avoided, and the measuring precision of the encoder is improved.

Drawings

The utility model will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.

FIG. 1 is a schematic view of a connection structure according to an embodiment of the present utility model when assembled with an output shaft of a motor;

FIG. 2 is a schematic structural view of the connection structure provided in the embodiment of FIG. 1;

FIG. 3 is a schematic view of the structure of the sleeve provided by the embodiment of FIG. 1;

FIG. 4 is a schematic view of the structure of the support provided by the embodiment of FIG. 1;

fig. 5 is a schematic structural diagram of an encoder according to another embodiment.

Reference numerals:

10. a support; 110. a bearing chamber; 120. a shoulder; 130. an internal thread portion; 20. a shaft sleeve; 210. a main body portion; 220. a base; 230. a first threaded portion; 30. a limiting piece; 40. a bearing assembly; 410. a bearing; 50. an output shaft; 60. a circuit board; 70. a photosensitive device; 80. a movable grating; 90. a light source.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

In order to solve the above-mentioned problems, at least one embodiment of the present utility model provides a connecting structure, which includes a supporting member 10, a shaft sleeve 20 and a limiting member 30; the shaft sleeve 20 is rotatably arranged on the support member 10, and the shaft sleeve 20 is used for being connected with an output shaft 50 of the motor; the limiting piece 30 is disposed on the shaft sleeve 20, and the limiting piece 30 is used for abutting against an end face of an output shaft 50 of the motor.

From the above, the limiting part 30 is arranged to limit the output shaft 50 of the motor, and the friction force between the limiting part 30 and the end face of the output shaft 50 of the motor is utilized to enable the shaft sleeve 20 and the output shaft 50 of the motor to always rotate synchronously, so that the situation that the shaft sleeve 20 cannot rotate synchronously with the output shaft 50 of the motor when the output shaft 50 of the motor is in initial rotation is avoided, and the measuring precision of the encoder is improved.

As shown in fig. 1 to 3, the connection structure includes a support member 10, a sleeve 20, and a stopper 30; the shaft sleeve 20 is rotatably arranged on the support member 10, and the shaft sleeve 20 is used for being connected with an output shaft 50 of the motor; the limiting piece 30 is disposed on the shaft sleeve 20, and the limiting piece 30 is used for abutting against an end face of an output shaft 50 of the motor.

Through setting up locating part 30 and playing the limiting displacement to the output shaft 50 of motor, utilize the frictional force between the terminal surface of locating part 30 and the output shaft 50 of motor, make axle sleeve 20 and the output shaft 50 of motor synchronous rotation all the time to improve the measurement accuracy of encoder.

The support 10 is a metal support, and for example, the support 10 is an aluminum alloy support.

It should be noted that the sleeve 20 is a metal sleeve, for example, the sleeve 20 is a stainless steel sleeve.

As shown in fig. 1-3, in some embodiments, the inner wall of the sleeve 20 is provided with a first threaded portion 230, the first threaded portion 230 being adapted to matingly engage a second threaded portion on the output shaft 50 of the motor; wherein the limiting member 30 is located at an end surface of the first threaded portion 230.

The first threaded part 230 is arranged on the inner wall of the shaft sleeve 20, so that the shaft sleeve 20 and the output shaft 50 of the motor are assembled together in a threaded connection mode, the assembly precision of the shaft sleeve 20 and the output shaft 50 of the motor in the axial direction is ensured, the coaxiality precision of the encoder and the output shaft 50 of the motor is ensured, and the working performance and the measurement precision of the encoder are improved; meanwhile, the assembling process of the encoder can be simplified, the requirement on the working skill of workers in the assembling process is reduced, and the assembling efficiency is improved. Compared with the assembly structure that the existing encoder is assembled on the motor shaft through two screws which are circumferentially arranged and have an included angle of 90 degrees, the assembly method adopting the threaded connection does not cause radial force on the encoder, and can effectively avoid the situation that the encoder is deviated from the position of the output shaft 50 of the motor, so that the encoder is not coaxial, and the coaxiality precision is abnormal.

As shown in fig. 1 and 2, in some embodiments, the inner diameter of the stop 30 is smaller than the inner diameter of the sleeve 20.

By limiting the inner diameter of the limiting piece 30 to be smaller than the inner diameter of the shaft sleeve 20, a step surface is formed between the limiting piece 30 and the shaft sleeve 20, and a structural basis is provided for the abutting of the end face of the output shaft 50 of the motor and the end face of the shaft sleeve 20.

In some embodiments, an annular groove is provided on the inner wall of the sleeve 20 and the stop 30 is partially disposed in the annular groove. It should be noted that the shape of the annular groove may be adapted to the shape of the stopper 30.

The annular groove is arranged to provide a structural foundation for the installation of the limiting piece 30, and the installation and the replacement are simple and convenient.

In some embodiments, the stop 30 is a nylon stop.

By limiting the nylon limiting piece as the limiting piece 30, the friction force between the limiting piece and the output shaft 50 of the motor is increased, so that synchronous rotation of the shaft sleeve 20 and the output shaft 50 of the motor is ensured, and the measuring precision of the encoder is improved. Meanwhile, heat in motor work can be conducted to the nylon limiting piece through the output shaft 50, the nylon limiting piece is heated and expanded, so that the contact area between the nylon limiting piece and the output shaft 50 of the motor is increased, and further larger friction force and better vibration reduction effect are provided, and vibration resistance and coaxiality accuracy of the encoder in the axial direction are improved.

As shown in fig. 1, in some embodiments, the support member 10 has a mounting hole coaxially disposed with the shaft sleeve 20, and the connection structure includes a bearing assembly 40 disposed in the mounting hole, wherein the shaft sleeve 20 is rotatably connected with the support member 10 through the bearing assembly 40.

The bearing assembly 40 is arranged to realize the rotary connection of the shaft sleeve 20 and the supporting piece 10, so that the shock resistance and stability of the encoder are improved, and the encoder can still stably feed back signals under the working condition of large interference.

As shown in fig. 1, 2, and 4, in some embodiments, the bearing assembly 40 includes at least one bearing 410, the bearing 410 including an outer race and an inner race rotatable relative to the outer race, the inner race being coupled to an outer wall of the sleeve 20; the outer ring is in threaded connection with the support member 10, and an adhesive layer is disposed between the external threaded portion of the outer ring and the internal threaded portion 130 of the support member 10 to adhere the outer ring and the support member 10.

The adhesive layer is a glue adhesive layer, and is formed by applying glue to the external thread portion of the outer race and/or the internal thread portion 130 of the support member 10.

It should be further noted that, the bearing 410 is a rolling bearing 410, the bearing assembly 40 includes a plurality of bearings 410, and the number of bearings 410 is set according to actual needs, and of course, the number of bearings 410 cannot be excessive, and the excessive number of bearings 410 increases the thickness and the volume of the encoder. For example, as shown in FIG. 2, bearing assembly 40 includes two bearings 410.

It should be noted that, the sleeve 20 is in clearance fit with the bearing 410, and the sleeve 20 is bonded with the bearing 410 by glue.

Through bearing 410 and support 10 threaded connection, not only can guarantee the axiality precision of bearing 410 assembly, avoid bearing 410 slope or eccentric, still utilize the screw thread of screw thread portion as the accommodation space of adhesive linkage, provide structural foundation for the adhesive linkage. In addition, when the adhesive layer is formed by coating the glue, the glue can gradually fill the threads along the threads of the threaded part, so that the area of the adhesive layer is increased, the adhesive force of the adhesive layer is improved, and the phenomenon of glue overflow can be effectively avoided under the condition of poor glue quantity control. Compared with the existing assembly mode of adopting interference fit or clearance fit between the bearing 410 and the supporting piece 10, the interference fit is easy to cause the position deviation of the bearing 410, so that the coaxiality of the encoder is poor, the clearance fit is required to be glued and fixed, the situation that the rotation of the bearing 410 is unsmooth due to glue overflow is easy to occur, and the coaxiality of the encoder is poor.

As shown in fig. 4, in some embodiments, at least one bearing chamber 110 is disposed on a hole wall of the assembly hole, at least one bearing chamber 110 corresponds to at least one bearing 410 one by one, and the bearing 410 is disposed in the corresponding bearing chamber 110. By providing bearing housing 110, a structural basis is provided for the assembly of bearing 410 on support 10.

It should be noted that, two bearing chambers 110 are provided on the hole wall of the assembly hole, the two bearing chambers 110 are in one-to-one correspondence with the two bearings 410, and the two bearing chambers 110 are arranged at intervals along the axis direction of the assembly hole; the bore diameter of the bearing housing 110 is larger than that of the assembly hole, and a shoulder 120 is formed between adjacent two bearing housings 110 to support the bearing 410.

As shown in fig. 3, in some embodiments, the sleeve 20 includes a body portion 210 and a base 220; the main body 210 is rotatably connected with the support 10 through the bearing assembly 40; one end of the base 220 is connected to the body 210; wherein the minimum width of the cross section of the base 220 is greater than the outer diameter of the body portion 210 to form a stepped surface against the bearing assembly 40.

By defining the cross-sectional minimum width of the base 220 to be less than the outer diameter of the body portion 210, a limiting effect is provided to the sleeve 20 during assembly to facilitate assembly.

The assembly hole penetrates the main body 210 and the base 220. It should be further noted that the base 220 may be a regular hexagonal base 220 to facilitate assembly.

At least one embodiment of the present utility model further provides an encoder, including the connection structure of any one embodiment of the present utility model, so as to have all technical effects brought by the technical solutions of the foregoing embodiments.

It should be noted that, the encoder includes, but is not limited to, an optical-to-electrical encoder, which converts an optical signal into an electrical signal, so as to implement measurement of various physical quantities such as angular displacement, velocity, and position.

For example, as shown in fig. 5, when the encoder is a photoelectric encoder, the encoder includes a circuit board 60, a photosensitive device 70, a movable grating 80, and a light source 90, the circuit board 60, the movable grating 80 are arranged at intervals in the axial direction of the shaft sleeve 20, the movable grating 80 is disposed on the shaft sleeve 20, and the movable grating 80 can rotate with the shaft sleeve 20; the photosensitive device 70 is arranged on the circuit board 60, and the photosensitive device 70 is arranged opposite to the movable grating 80; the light source 90 is disposed on the support 10.

At least one embodiment of the present utility model further provides a motor, including the encoder according to any one of the embodiments of the present utility model, so as to have all the technical effects brought by the technical solutions of the foregoing embodiments.

It should be noted that, the encoder is mounted on the output shaft 50 of the motor through the connection structure, and detects and collects the motion information of the motor through the encoder, and transmits the motion information to the control system, thereby realizing accurate control of the motor.

While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A connection structure, characterized by comprising:

a support;

2. The connection structure according to claim 1, wherein an inner wall of the sleeve is provided with a first screw portion for mating connection with a second screw portion on an output shaft of the motor; wherein, the locating part is located the terminal surface of first screw thread portion.

3. The connection according to claim 1, wherein an inner diameter of the stopper is smaller than an inner diameter of the boss.

4. The connection structure according to claim 1, wherein an annular groove is provided on an inner wall of the sleeve, and the stopper portion is provided in the annular groove.

5. The connection according to claim 1, wherein the stop is a nylon stop.

6. The connection structure according to any one of claims 1 to 5, wherein the support member has a fitting hole provided coaxially with the boss, the connection structure including a bearing assembly provided in the fitting hole, wherein the boss is rotatably connected with the support member through the bearing assembly.

7. The connection according to claim 6, wherein the bearing assembly comprises at least one bearing comprising an outer race and an inner race rotatable relative to the outer race, the inner race being connected to an outer wall of the sleeve;

8. The connection structure according to claim 7, wherein at least one bearing chamber is provided on a wall of the fitting hole, the at least one bearing chamber being in one-to-one correspondence with the at least one bearing, the bearing being provided in the corresponding bearing chamber.

9. The connection according to claim 6, wherein the sleeve comprises:

a base, one end of which is connected with the main body part;

10. An encoder comprising a connection structure as claimed in any one of claims 1 to 9.

11. An electric machine comprising an encoder as claimed in claim 10.