Photoelectric encoder assembly for motor and motor

Abstract

The utility model belongs to the technical field of encoders, and particularly relates to a photoelectric encoder assembly for a motor and the motor. A photoelectric encoder assembly for a motor comprises an encoder cover cap and an encoder base, a code disc is arranged in a cavity formed by the encoder cover cap and the encoder base, a circuit board is fixed on the encoder base, and a socket and a reading head are arranged on the circuit board. The encoder base is provided with a supporting part which extends towards the side of the encoder cover cap and is in contact with the lower end face of the circuit board, the supporting part is enclosed to form a receding groove, the encoder base is provided with two positioning columns which extend towards the side of the encoder cover cap, the circuit board is provided with two positioning holes through which the positioning columns penetrate, and the positioning holes are communicated with the positioning columns. And a pressing part for pressing the circuit board is arranged in the encoder cover. A motor comprising a photoelectric encoder comprises a motor body, an end cover and the photoelectric encoder fixed on the end cover. The utility model has the advantages that the encoder circuit board can be conveniently replaced by an operator, and the universality is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of encoders, and in particular relates to a photoelectric encoder assembly for a motor and the motor. Background Art

[0002] Photoelectric encoders are widely used in automation control technology due to their simple structure, high measurement accuracy, and long life. Photoelectric encoders mainly include encoder cover and encoder base. The chamber surrounded by the encoder cover and encoder base is equipped with a circuit board, an encoder reader and wiring socket set on the circuit board, and a code disk matched with the encoder reader. Usually, the circuit board is fixed to the encoder base by ultrasonic welding, glue fixing, riveting or screw fixing. Usually, photoelectric encoders are used on DC motors.

[0003] For example, Chinese patent application number 200580032806.8 discloses an optical encoder device for a small motor and a manufacturing method thereof, wherein a spacer (encoder base) is provided between the substrate (circuit board) and the end cover of the optical sensor module, and the substrate (circuit board) and the spacer (encoder base) are connected by riveting.

[0004] For example, a Chinese patent with application number 201420869147.X discloses a servo motor encoder. Among them, a plurality of isolation columns are arranged between the second circuit board and the mounting seat, and the second circuit board is fixed on the top of the mounting seat by a plurality of fasteners. The fasteners are arranged one-to-one with the isolation columns and the fasteners are inserted into the isolation columns. One end of the fastener is fixedly connected to the mounting seat, and the other end passes through the first circuit board and its end presses the first circuit board against the end of the isolation column. The circuit board is fixed to the encoder base by fasteners (screws).

[0005] Different encoders have different line counts, such as 100 lines, 200 lines, 500 lines, etc. The line count represents the resolution of the encoder, that is, the number of pulses the encoder can send after one rotation. When the motor requires an encoder with a different resolution, the code disk and the entire circuit board need to be replaced. If ultrasonic welding, glue fixing or riveting are used, it is difficult to remove the circuit board and the encoder base, and the entire encoder base needs to be replaced. Even if the circuit board is removed, it cannot be reused, and the versatility is poor. If screw fixing is used, although it can be disassembled, the efficiency is low. The operator needs to unscrew the screws one by one, and then re-screw the screws after replacing the circuit board, and the replacement efficiency is low. Utility Model Content

[0006] The utility model aims to provide a photoelectric encoder assembly and a motor for a motor, which are convenient for operators to replace an encoder circuit board and have good versatility.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a photoelectric encoder assembly for a motor, comprising an encoder cover and an encoder base matched with the encoder cover, the encoder base is used to be fixed to the end cover of the motor, the encoder base and the encoder cover are both provided with a through hole through which the power supply motor output shaft passes, the code disk is used to be sleeved on the motor output shaft and is located in a chamber formed by the encoder cover and the encoder base, a circuit board is fixed on the encoder base, a socket and a reader matched with the code disk are provided on the circuit board; the encoder base is provided with a support portion extending toward the encoder cover side and in contact with the lower end surface of the circuit board, the support portion encloses to form a make way groove for making way for the electronic components of the circuit board, the encoder base is provided with at least two positioning posts extending toward the encoder cover side, the circuit board is provided with at least two positioning holes for the positioning posts to pass through, a pressing portion for pressing the circuit board is provided in the encoder cover, and when the encoder cover is covered with the encoder base, the pressing portion presses the circuit board.

[0008] Among them, a reader head and a wiring socket that match the code disk are fixed on the circuit board.

[0009] When the circuit board needs to be replaced, the operator opens the encoder cover to release the circuit board from the compressed state, then takes the circuit board out of the positioning column and removes the code disc from the motor output shaft. Then replace the new code disc and position the circuit board from top to bottom through the positioning column, then install the reader and the socket, and cover the encoder cover with the encoder base so that the compression part compresses the replaced circuit board, thus completing the replacement of the circuit board.

[0010] This solution supports the circuit board through the support part, and then realizes the positioning of the circuit board through the cooperation of at least two positioning columns and the positioning holes of the circuit board, limits the lateral position of the circuit board, and finally presses the circuit board through the clamping part to limit the vertical position of the circuit board. Thereby, the circuit board is fixed to the encoder base. Compared with the reference document, it does not need to be fixed with welding or glue, and can be recycled after removal, and has good versatility. And there is no need to fix the circuit board to the encoder base with screws, which can facilitate the operator to replace the circuit board.

[0011] Preferably, the inner wall of the lower end of the encoder cover is provided with an annular protrusion extending radially inward, and the annular protrusion forms the clamping portion. When the encoder cover is covered with the encoder base, the inner wall of the lower end of the encoder cover contacts the outer wall of the encoder base, and the axial end face of the annular protrusion contacts and presses the circuit board.

[0012] When the encoder cover is covered with the encoder base, the inner wall of the lower end of the encoder cover contacts the outer wall of the encoder base to ensure that the encoder cover does not deviate. The position of the encoder cover is determined to ensure that the axial end face of the annular protrusion contacts the end face of the circuit board, thereby ensuring that the circuit board is pressed tightly.

[0013] Preferably, the axial end surface of the annular protrusion contacts the upper end surface at the radial outer edge of the circuit board, and the supporting portion contacts the lower end surface at the radial outer edge of the circuit board.

[0014] There are electronic components on the circuit board, but there are no electronic components at the radial outer edge of the circuit board. When the annular protrusion presses the circuit board, the pressing force will directly act on the radial outer edge of the circuit board and then be transmitted to the supporting part. The pressed part of the circuit board will be supported by the supporting part, thereby preventing the circuit board from being crushed and preventing the supporting part and the annular protrusion from hitting the electronic components.

[0015] Preferably, a mating piece is fixed to the lower end of the positioning column, and the encoder base is provided with a mating groove opening to the encoder cover side, the circumferential outer wall of the mating piece contacts the circumferential inner wall of the mating groove, and the mating piece and the mating groove are detachable.

[0016] The circuit boards of encoders with different line counts may be different, so different positioning holes and positioning columns are required to achieve the positioning effect of the circuit board. The matching pieces and matching slots are detachable, and both the matching pieces and matching slots are standard parts and can always be disassembled or matched; different sizes of positioning columns and matching pieces can be fixed, making the circuit board base more universal.

[0017] Preferably, at least three annular buckles evenly spaced apart are provided on the circumferential outer wall of the circuit board base, the outer side surface of the buckle is a slope, the thickness of the buckle gradually increases from the encoder cover side to the encoder base side, the lower end of the encoder cover is provided with a buckle portion corresponding to the buckle one by one, the buckle portion is provided with a buckle groove penetrating the inner and outer walls of the encoder cover, and the buckle cooperates with the buckle groove.

[0018] The encoder cover is connected to the encoder base by a snap-fit ​​connection, which further facilitates assembly by the operator and reduces the number of parts by eliminating the need for screw fixation.

[0019] Preferably, each of the buckle portions is provided with spacing grooves on both circumferential sides, which are open to the encoder base side and radially penetrate the inner wall and the outer wall of the encoder cover.

[0020] The spacing groove can be provided to facilitate the buckle portion to deform when the buckle is buckled in, thereby facilitating the buckle to be buckled in.

[0021] Preferably, a groove with a lateral opening and axially penetrating the top of the encoder cover is provided on the outer wall of the encoder cover, and the groove is located above the buckle portion and communicated with the buckle groove of the buckle portion.

[0022] By providing the groove, the wall of the encoder cover above the buckle portion can be made thinner, so that the buckle portion is easier to deform when the buckle is engaged.

[0023] A motor including a photoelectric encoder includes a motor body and an end cover, wherein a bearing support portion extending axially outward is provided at the center of the end cover, and the encoder base is provided with an inner ring hole axially penetrating and cooperating with the bearing support portion, and the inner wall of the inner ring hole contacts the outer wall of the bearing support portion; the encoder base is fixed to the end cover, and the code disc is mounted on the motor output shaft through a code disc fixing sleeve, and when the encoder cover is covered with the encoder base, the axial lower end face of the encoder cover contacts the end face of the end cover of the motor.

[0024] The bearing support part cooperates with the inner ring hole of the encoder base, so as to realize the positioning of the encoder base. The axial lower end surface of the encoder cover contacts with the end surface of the end cover of the motor, so that the dustproof effect of the encoder is good.

[0025] The utility model has the following advantages: the circuit board is supported by the support part, and then the circuit board is positioned by the cooperation of at least two positioning columns and the positioning holes of the circuit board, and the lateral position of the circuit board is limited. Finally, the circuit board is pressed by the pressing part to limit the vertical position of the circuit board, so as to achieve the fixation between the circuit board and the encoder base. The operator does not need to screw the screws, and can directly cover the encoder cover to achieve the clamping and fixing of the circuit board, which is very convenient. And when the circuit board is pressed, the circuit board can be prevented from being crushed. At the same time, the encoder cover and the encoder base are fixed by the cooperation of the buckle and the buckle groove, and no screws are required to fix it, which can reduce parts and facilitate the closing of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] Figure 2 This is a schematic diagram of the structure after removing the encoder cover.

[0028] Figure 3 for Figure 1 Explosion diagram.

[0029] Figure 4 This is a schematic diagram of the structure of the encoder base.

[0030] Figure 5 This is a schematic diagram of the structure of the encoder cover.

[0031] Figure 6This is a cross-sectional view of the encoder cover and encoder base after they are covered.

[0032] Figure 7 This is an enlarged view of the clamping part where the circuit board is clamped.

[0033] Figure numbers: encoder cover 1, lead wire cover 11, inner wall of the lower end of the encoder cover 12, annular protrusion 13, encoder base 2, code disk 21, code disk fixing sleeve 22, give way groove 23, support part 24, circuit board 3, socket 31, reader 32, positioning hole 33, fixing hole 4, positioning column 5, mating part 51, mating groove 52, buckle 6, buckle part 7, buckle groove 71, spacing groove 72, groove 73, screw 8, inner ring hole 9, motor body 100, end cover 200, motor output shaft 300, electronic component 400, bearing support part 500. DETAILED DESCRIPTION

[0034] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0035] like Figures 1 to 3 As shown, this embodiment discloses a motor including a photoelectric encoder assembly, including a motor body 100 and a photoelectric encoder assembly, the photoelectric encoder assembly including an encoder cover 1 and an encoder base 2, the encoder cover 1 and the encoder base 2 are covered, the encoder base 2 is fixed on the end cover 200 of the motor body 100, and the encoder cover 1 and the encoder base 2 are both provided with a through hole through which the power supply motor output shaft 300 passes. The motor end cover 200 is provided with a bearing support portion 500 extending upward, the encoder base 2 is annular, the inner ring hole 9 of the encoder base 2 cooperates with the bearing support portion 500, and the inner wall of the inner ring hole 9 of the encoder base 2 contacts the outer wall of the bearing support portion 500, thereby realizing the circumferential positioning of the encoder base 2. The encoder base 2 is provided with two fixing holes 4 that penetrate up and down, and the screws 8 pass through the fixing holes 4 and are threadedly matched with the motor end cover 200 to realize the fixation between the encoder base 2 and the motor end cover 200. After the encoder cover 1 and the encoder base 2 are covered, the lower end surface of the encoder cover 1 contacts the end surface of the motor end cover 200.

[0036] like Figures 2 to 4 As shown, the encoder cover 1 and the encoder base 2 form a chamber together, in which a circuit board 3 and a code disc 21 are arranged, and a socket 31, a reader 32 and an electronic component 400 are fixed on the circuit board 3. Code disc fixing sleeves 22 are arranged at both axial ends of the code disc 21, and the code disc 21 and the code disc fixing sleeve 22 are sleeved on the motor output shaft 300. The code disc 21 and the code disc fixing sleeve 22 are located on one side of the circuit board 3 and part of the code disc 21 is located in the reader 32, and the reader 32 is a light emitting element and a light receiving element. The code disc 21 and the code disc fixing sleeve 22 can also be an aluminum one-piece code disc.

[0037] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the encoder base 2 is provided with a support portion 24 extending toward the encoder cover 1, and the support portion 24 is used to contact the lower end surface of the circuit board 3 to support the circuit board 3. The support portion 24 encloses a clearance groove 23 for making way for the electronic components 400 of the circuit board 3, and the clearance groove 23 presents an arc structure. The encoder base 2 is provided with two positioning columns 5 extending toward the encoder cover 1, and a matching piece 51 is fixed at the lower end of the positioning column 5; the encoder base 2 is provided with a matching groove 52 opening toward the encoder cover 1 and penetrating the upper end surface of the support portion 24, the matching groove 52 and the matching piece 51 are detachably arranged, and the circumferential outer wall of the matching piece 51 contacts the circumferential inner wall of the matching groove. The circuit board 3 is provided with a positioning hole 33 penetrating from top to bottom and for the positioning column 5 to pass through, the circumferential inner wall of the positioning hole 33 contacts the circumferential outer wall of the positioning column 5, and the positioning hole 33 is located at both ends of the circumference of the circuit board 3 and matches the positioning column 5.

[0038] like Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the opening of the encoder cover 1 faces the encoder base 2, and the inner wall 12 at the lower end of the encoder cover is provided with an annular protrusion 13 extending radially inward. A step-shaped step structure is formed between the annular protrusion 13 and the inner wall 12 at the lower end of the encoder cover, and the annular protrusion 13 constitutes a pressing portion for pressing the circuit board 3. When the encoder cover 1 is covered with the encoder base 2, the axial end face of the annular protrusion 13 presses the circuit board 3. The support portion 24 contacts the lower end face at the radial outer edge of the circuit board 3, and the axial end face of the annular protrusion 13 contacts the upper end face at the radial outer edge of the circuit board. The circumferential outer wall of the encoder base 3 is provided with three annular buckles 6 evenly spaced apart. The outer side of the buckle 6 is an inclined surface. The thickness of the buckle 6 gradually increases from the encoder cover 1 side to the encoder base 2 side. The lower end of the encoder cover 1 is provided with a buckle portion 7 corresponding to the buckle 6. The buckle portion 7 is provided with a buckle groove 71 penetrating the inner and outer walls of the encoder cover 1. The buckle 6 cooperates with the buckle groove 71. The lower end of the encoder cover is provided with a spacing groove 72 opening to the encoder base 2 side and radially penetrating the inner and outer walls of the encoder cover 1 on both sides of the circumference of the buckle portion 7. The outer wall of the encoder cover 1 is provided with a groove 73 opening laterally and penetrating the top of the encoder cover 1 axially. The groove 73 is located above the buckle portion 7 and communicates with the buckle groove 71 of the buckle portion 7. The encoder cover 1 is also provided with a lead-out wire cover 11. The inner cavity of the lead-out wire cover 11 is communicated with the inner cavity of the encoder cover 1, and the lead-out wire cover 11 corresponds to the side of the socket 31.

[0039] When the number of lines of the encoder needs to be changed, the operator opens the encoder cover 1, then removes the reader 32, the code disc 21 and the code disc fixing sleeve 22, then takes the circuit board 3 out of the encoder base 2, and then places the circuit board 3 of another number of lines on the encoder base 2, so that the positioning column 5 on the encoder base 2 passes through the positioning hole 33 of the circuit board 3, and then assembles the reader 32 of another number of lines, the code disc 21 and the code disc fixing sleeve 22 on the circuit board 3 and the motor output shaft 300 respectively, and then fixes the encoder cover 1 and the encoder base 2 with the buckle 6, so that the pressing part of the encoder cover 1 presses the end face of the circuit board 3, thereby realizing the replacement and fixation of the circuit board 3, and finally realizing the replacement of the number of encoder lines.

Claims

1. A photoelectric encoder assembly for a motor, comprising an encoder cover and an encoder base matched with the encoder cover, the encoder base being used to be fixed to the end cover of the motor, the encoder base and the encoder cover both being provided with a through hole through which the output shaft of the power supply motor passes, the code disc being used to be sleeved on the output shaft of the motor and being located in a chamber formed by the encoder cover and the encoder base, a circuit board being fixed on the encoder base, the circuit board being provided with a socket and a reader matched with the code disc; characterized in that: The encoder base is provided with a support portion extending toward the encoder cover side and in contact with the lower end surface of the circuit board, the support portion encloses a groove for making way for the electronic components of the circuit board, the encoder base is provided with at least two positioning posts extending toward the encoder cover side, the circuit board is provided with at least two positioning holes for the positioning posts to pass through, the encoder cover is provided with a clamping portion for clamping the circuit board, and when the encoder cover is covered with the encoder base, the clamping portion clamps the circuit board.

2. The photoelectric encoder assembly for a motor according to claim 1, characterized in that: The inner wall of the lower end of the encoder cover is provided with an annular protrusion extending radially inward, and the annular protrusion forms the clamping portion. When the encoder cover is covered with the encoder base, the inner wall of the lower end of the encoder cover contacts the outer wall of the encoder base, and the axial end face of the annular protrusion contacts and clamps the circuit board.

3. The photoelectric encoder assembly for a motor according to claim 2, characterized in that: The axial end surface of the annular protrusion contacts the upper end surface at the radial outer edge of the circuit board, and the support portion contacts the lower end surface at the radial outer edge of the circuit board.

4. The photoelectric encoder assembly for a motor according to claim 1, characterized in that: A matching piece is fixed to the lower end of the positioning column, and the encoder base is provided with a matching groove opening to the encoder cover side, the circumferential outer wall of the matching piece contacts the circumferential inner wall of the matching groove, and the matching piece and the matching groove are detachably arranged.

5. The photoelectric encoder assembly for a motor according to any one of claims 1 to 4, characterized in that: At least three annular buckles are evenly spaced on the circumferential outer wall of the circuit board base, the outer side surface of the buckle is a slope, the thickness of the buckle gradually increases from the encoder cover side to the encoder base side, the lower end of the encoder cover is provided with a buckle portion corresponding to the buckle one by one, the buckle portion is provided with a buckle groove penetrating the inner and outer walls of the encoder cover, and the buckle cooperates with the buckle groove.

6. The photoelectric encoder assembly for a motor according to claim 5, characterized in that: Both circumferential sides of each buckle portion are provided with spacing grooves which are open to the encoder base side and radially penetrate the inner wall and the outer wall of the encoder cover.

7. The photoelectric encoder assembly for a motor according to claim 6, characterized in that: The outer wall of the encoder cover is provided with a groove which has a lateral opening and axially penetrates the top of the encoder cover. The groove is located above the buckle portion and communicates with the buckle groove of the buckle portion.

8. A motor comprising the photoelectric encoder assembly according to any one of claims 1 to 7, comprising a motor body and an end cover, characterized in that: A bearing support portion extending axially outward is provided at the center of the end cover, and the encoder base is provided with an inner ring hole axially penetrating and cooperating with the bearing support portion, and the inner wall of the inner ring hole contacts the outer wall of the bearing support portion; the encoder base is fixed to the end cover, and the code disc is mounted on the motor output shaft through a code disc fixing sleeve, and when the encoder cover is covered with the encoder base, the axial lower end face of the encoder cover contacts the end face of the end cover of the motor.

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