CN220187744U

CN220187744U - Ultra-thin encoder

Info

Publication number: CN220187744U
Application number: CN202321035252.9U
Authority: CN
Inventors: 王沛玉
Original assignee: Changsha Meichuang Sensing Technology Co ltd
Current assignee: Changsha Meichuang Sensing Technology Co ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-12-15
Anticipated expiration: 2033-05-04

Abstract

The utility model discloses an ultrathin encoder, which comprises a cylindrical supporting part with a shaft hole, a supporting part of a flange plate positioned on the cylindrical supporting part, an upper bearing and a lower bearing which are arranged on the upper side and the lower side of the flange plate, an upper frame arranged on the inner side wall of the flange structure of the upper bearing, a lower frame arranged on the inner side wall of the flange structure of the lower bearing, and a middle frame matched with the outer edges of the upper frame and the lower frame, wherein the inner rings of the upper bearing and the lower bearing are arranged on the cylindrical supporting part, the upper frame and the lower frame are arranged on the outer rings of the upper bearing and the lower bearing through respective center holes, the lower end face of the flange plate is fixedly connected with a code plate, and the upper frame and the lower frame are fixedly connected with the middle frame; the utility model can greatly reduce the overall thickness of the encoder, eliminate play and improve the overall precision and stability.

Description

Ultra-thin encoder

Technical Field

The utility model relates to the field of motor encoders, in particular to an ultrathin encoder.

Background

An encoder (encoder) is a device that compiles, converts, or converts a signal (e.g., a bit stream) or data into a signal form that can be used for communication, transmission, and storage. The encoder converts angular displacement, referred to as a code wheel, or linear displacement, referred to as a code scale, into an electrical signal. Encoders can be classified into contact type and non-contact type according to the read-out mode; encoders can be classified into incremental and absolute types according to the operating principle. The incremental encoder converts the displacement into a periodic electric signal, and then converts the electric signal into counting pulses, and the number of the pulses is used for representing the size of the displacement. Each position of the absolute encoder corresponds to a determined digital code, so that its indication is only related to the start and end positions of the measurement, and not to the intermediate course of the measurement.

The encoder is an important component part of a servo motor or a stepping motor, is an indispensable important accessory in production, the structure of the existing encoder is shown in fig. 1, three main components such as a light source, a code disc, a sensing component and the like are all arranged on the same side of a supporting component (a rack), on one hand, the thickness of the existing structure is still large and basically ranges from 20mm to 30mm, on the other hand, the structure is characterized in that the light source is required to be fixed at a position close to the supporting component, the code disc and the sensor circuit board are arranged at a position gradually far away from the supporting component, the efficiency is low when the encoder is regulated to enable the code disc and the sensor to be accurately aligned with a code channel, and the maintenance is inconvenient, so that the encoder which is more convenient to regulate and maintain and thinner is required to be designed.

Disclosure of Invention

In view of this, there is a need to overcome at least one of the above-described drawbacks of the prior art. The utility model provides an ultrathin encoder, which comprises a supporting part arranged on a motor shaft, wherein the supporting part comprises a cylindrical supporting part which is provided with a shaft hole for passing through the motor shaft and is provided with a bearing on the outer wall, and a flange plate is positioned in the middle of the outer wall of the cylindrical supporting part; the upper bearing and the lower bearing are arranged on the cylindrical supporting part and on the upper side and the lower side of the flange plate, an upper frame matched with the outer end face and the outer side wall of the outer ring of the upper bearing, a lower frame matched with the outer end face and the outer side wall of the outer ring of the lower bearing, and a middle frame matched with the upper frame and the lower frame, wherein the inner rings of the upper bearing and the lower bearing are arranged on the cylindrical supporting part, the upper frame and the lower frame are arranged on the outer rings of the upper bearing and the lower bearing through respective center holes, the lower end face of the flange plate is fixedly connected with the code wheel, and the upper frame is fixedly connected with the lower frame and the middle frame.

The code disc is fixedly arranged on the outer edge of the flange, the bearing is a commonly used cylindrical bearing, at the moment, the upper bearing is fixedly arranged on two sides of the flange, in this case, the inner ring of the bearing is required to be fixedly connected in a bonding mode, for example, an upper frame, a middle frame and a lower frame are simultaneously arranged on the outer ring of the bearing, the upper frame and the lower frame are provided with surfaces which are simultaneously attached to the outer side end face of the bearing and the outer side wall of the outer ring, namely, a stepped structure is formed, as shown in fig. 6 and 7, the lower frame 33 and the outer side end face of the bearing 142 are in a stepped structure, at the moment, the inner side surfaces of the upper frame and the lower frame are attached to and fixed with the outer side end face of the outer ring of the bearing, the inward pressure of the upper frame and the lower frame to the outer ring of the bearing is formed, so that the clearance of the bearing in rotation is eliminated, and meanwhile, as the matching surfaces between the upper frame and the lower frame are in a precision processing fit, the concentricity requirement of the encoder is ensured, and the whole precision is further improved.

The upper frame and the lower frame also adopt corresponding hollow structures for penetrating through components on the PCB (the hollow structures have the significance that the components on the PCB are welded on one side facing the inside of the encoder, and the inner space of the encoder is fully utilized), so that the overall thickness of the encoder is further shortened; the whole thickness of the encoder can reach about 9 mm by using the supporting component, even the encoder can be thinner, and the thickness is reduced by more than 30%, thus the encoder is the thinnest product in the similar products in the world at present.

Further, an upper circuit board is installed on the upper side of the upper frame, and a photocell board is installed on the lower side of the lower frame.

Further, the shaft hole is an internally threaded hole including internal threads for locking engagement with the motor shaft.

Further, the internal thread hole is positioned at one end of the shaft hole, the internal thread hole is a part of the shaft hole, the outer end of the internal thread hole is consistent with the outer end of the shaft hole, and the other end of the internal thread hole is positioned at the inner side of the shaft hole

Preferably, the internal thread hole has a middle hole (not shown) having an inner diameter larger than that of the internal thread hole at the inner side of the shaft hole, which is extended into the shaft hole, to form a transition structure with the shaft hole at the other side.

Further, the outer edge of the flange plate is provided with a tilting structure for fixing the code plate, and the flange plate between the tilting structure and the cylindrical supporting part forms an annular groove structure.

Further, the upper frame, the lower frame and the middle frame are provided with positioning structures which are used for mutually matching and ensuring concentricity, and locking parts used for locking and fixing are arranged between the upper frame, the lower frame and the middle frame.

Furthermore, the positioning structure comprises positioning holes and positioning columns, wherein the positioning holes are arranged on the upper frame, the lower frame or the middle frame and are matched with each other to ensure concentricity precision of the upper frame, the lower frame and the middle frame; the positioning holes and the positioning columns can be designed, wherein one part is provided with the positioning holes, the other part matched with the positioning holes is also provided with the matched positioning holes, and the positions of the positioning holes and the positioning columns are accurately fixed through the positioning columns or the positioning pins;

or (b)

The positioning male head/female head is arranged on the upper frame or the lower frame or the middle frame and matched with each other to ensure concentricity precision of the upper frame, the lower frame and the middle frame, and the principle of the positioning male head/female head is the same as that of the positioning column and the positioning hole;

or (b)

The structure comprises an arc surface or a positioning surface which is arranged between the upper frame and the middle frame and is used for mutually matching and ensuring concentricity precision, and an arc surface or a positioning surface which is arranged between the lower frame and the middle frame and is used for mutually matching and ensuring concentricity precision, wherein in the structure, the two matched surfaces can be adopted for accurately positioning, if the cambered surface matched with the upper frame and the middle frame is used as a positioning surface to ensure accurate positioning between the upper frame and the middle frame, the cambered surface needs to be subjected to finish machining for ensuring accuracy, and the matched plane is made on the upper frame and the middle frame more simply and conveniently, and the positioning is performed through the positioning surface.

The upper frame, the middle frame and the lower frame are matched for positioning, a positioning surface or a positioning cambered surface can be freely selected, or a positioning pin hole, a positioning male head, a positioning female head and the like are selected according to a convenient mode or cost and the like.

Further, the upper frame and the lower frame are provided with hollow structures penetrating through the upper circuit board and the components on the photocell board, and the upper circuit board and the photocell board are provided with components, one side of the components faces the inner side of the supporting part for installation.

Further, the upper circuit board is provided with a mounting through hole, the upper circuit board is mounted on the upper frame through the mounting through hole by using a fastener, the photocell board is provided with a mounting hole, and the photocell board is mounted on the lower frame through the mounting hole by using a fastener.

Further, the bearing inner ring is fixedly arranged with the outer wall of the cylindrical supporting part in a bonding mode.

Further, the shaft hole includes an upper shaft hole in which the motor shaft is installed and a lower shaft hole for a locking screw for locking the encoder to the motor shaft, the locking screw being fitted with a locking screw hole whose opening is located at an end face of the motor shaft.

Further, the aperture of the lower shaft hole is larger than that of the locking threaded hole, and the inner wall of the lower shaft hole is a smooth hole or a hole with internal threads.

Further the lower shaft bore includes a counterbore for carrying the head of the locking screw.

Further, the upper frame and the middle frame are integrally formed, the lower frame and the middle frame are cooperatively connected, or the lower frame and the middle frame are integrally formed, and the upper frame and the middle frame are cooperatively connected.

Further, the upper frame and the lower frame are respectively in step fit with the middle frame, the lower surface of the step structure of the upper frame is matched with the upper surface of the middle frame, the upper surface of the step structure of the lower frame is matched with the lower surface of the middle frame, and fastening pieces are arranged at the step fit positions of the upper frame and the lower frame and the middle frame for connection.

Furthermore, the upper frame and the lower frame are provided with matching countersunk holes at the positions corresponding to the matching positions, the heads of the fasteners are arranged in the matching countersunk holes, and the threaded parts of the fasteners are matched with the threaded holes of the middle frame at the positions corresponding to the matching positions.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a prior art arrangement;

FIG. 2 is a schematic view of the side upper angle structure of the support member of the present utility model;

FIG. 3 is a schematic view of the side down angle structure of the support member of the present utility model;

FIG. 4 is a schematic top view of the support member of the present utility model;

fig. 5 is a cross-sectional view of the support member AA of the present utility model in the direction;

FIG. 6 is a schematic diagram of a structure including a code wheel, upper, middle and lower frames, and a bearing with a flange structure;

FIG. 7 is a schematic view of one of the mating structures between the upper, middle and lower frames;

FIG. 8 is a schematic view of the mounting of an encoder on a motor shaft using a locking screw;

the motor comprises a motor 11, a motor 12, a motor shaft 121, a locking threaded hole, a motor 13, a motor 14 lower bearing 15 upper bearing 16 code wheel, a motor 17PCB (various components are arranged above the motor, not shown), a motor 171 upper PCB, a motor 172 lower PCB, a motor 18, a motor 19, a motor 21, a motor flange 211 upper chamfer, a motor 212 lower chamfer, a motor 213 inner groove, a motor 214 tilting structure, a motor 22 cylindrical support part, a motor 221 cylindrical support part lower part, a motor 222 cylindrical support part upper part, a motor 23 shaft hole, a motor 21 flange, a motor 231 threaded hole, a motor 232 upper shaft hole, a motor 233 lower shaft hole, a motor 151 upper bearing inner ring, a motor 152 upper bearing outer ring, a motor 141 lower bearing inner ring, a motor 142 lower bearing outer ring, a motor 31 upper frame, a motor 32 middle frame 33 lower frame, a motor M locking screw, a motor M1 counter sunk hole, a motor MJ fastener MJ 1.

Description of the embodiments

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "connected," "coupled," "mated," and the like are to be construed broadly, and may be, for example, fixedly coupled, integrally coupled, detachably coupled, rotatably coupled, etc.; may be a communication between the interiors of two elements; can be directly connected or indirectly connected through an intermediate medium; the "mating" may be a face-to-face or a point-to-face or line-to-face mating, and also includes a mating of the axes of the holes, as would be understood by one of ordinary skill in the art, in a particular sense by the terms described above.

The ultra-thin encoder of the present utility model will be described with reference to the accompanying drawings, in which fig. 1 is a schematic view of a prior art scheme; FIG. 2 is a schematic view of the side upper angle structure of the support member of the present utility model; FIG. 3 is a schematic view of the side down angle structure of the support member of the present utility model; FIG. 4 is a schematic top view of the support member of the present utility model; fig. 5 is a cross-sectional view of the support member AA of the present utility model in the direction; FIG. 6 is a schematic diagram of a structure including a code wheel, upper, middle and lower frames, and a bearing with a flange structure; fig. 7 is a schematic view of one of the fitting structures between the upper and lower frames, and fig. 8 is a schematic view of the structure in which the encoder is mounted on the motor shaft using the locking screw.

As shown in fig. 6, an embodiment of an ultra-thin encoder according to the present utility model includes a support member mounted on a motor shaft, the support member including a cylindrical support part having a shaft hole for passing through the motor shaft and having a bearing mounted on an outer wall, a flange plate positioned at a middle portion of the outer wall of the cylindrical support part; the upper bearing and the lower bearing are arranged on the cylindrical supporting part and on the upper side and the lower side of the flange plate, an upper frame matched with the outer end face and the outer side wall of the outer ring of the upper bearing, a lower frame matched with the outer end face and the outer side wall of the outer ring of the lower bearing, and a middle frame matched with the upper frame and the lower frame, wherein the inner rings of the upper bearing and the lower bearing are arranged on the cylindrical supporting part, the upper frame and the lower frame are arranged on the outer rings of the upper bearing and the lower bearing through respective center holes, the lower end face of the flange plate is fixedly connected with the code wheel, and the upper frame is fixedly connected with the lower frame and the middle frame.

The code disc is fixedly arranged on the outer edge of the flange, the bearings are commonly used cylindrical bearings (such as deep groove ball bearings), at the moment, the upper bearings are fixedly arranged on the two sides of the flange, in this case, the inner ring of the bearing needs to be fixedly connected in a bonding mode, for example, an upper, middle and lower frames are simultaneously arranged on the outer ring of the bearing, the upper and lower frames are provided with surfaces which are simultaneously attached to the outer side end face of the bearing and the outer side wall of the outer ring, namely, a stepped structure is formed, as shown in fig. 6 and 7, the inner side surfaces of the upper and lower frames are attached and fixed with the outer side end face of the outer ring of the bearing, so that the inward pressure of the upper and lower frames on the outer ring of the bearing is formed, the clearance of the bearing in rotation is eliminated, and meanwhile, the requirement of concentricity of the encoder is further improved due to the fact that the matching surfaces between the upper and lower frames are in precision processing fit.

According to some embodiments of the utility model, an upper circuit board is mounted on the upper side of the upper frame, and a photocell board is mounted on the lower side of the lower frame.

According to some embodiments of the utility model, the shaft bore is an internally threaded bore having internal threads for locking engagement with the motor shaft.

Further, the internal threaded hole is positioned at one end of the shaft hole, the internal threaded hole is a part of the shaft hole, the outer end of the internal threaded hole is consistent with the outer end of the shaft hole, and the other end of the internal threaded hole is positioned at the inner side of the shaft hole

According to some embodiments of the utility model, the flange plate outer edge is provided with a tilting structure for fixing the code plate, and the flange plate between the tilting structure and the cylindrical supporting part forms an annular groove structure.

According to some embodiments of the utility model, the upper frame and the lower frame and the middle frame have positioning structures for mutually matching and ensuring concentricity, and locking components for locking and fixing are arranged between the upper frame and the lower frame and between the middle frame.

Further, the positioning structure comprises positioning holes and positioning columns, wherein the positioning holes are arranged on the upper frame, the lower frame or the middle frame and are matched with each other to ensure concentricity precision of the upper frame, the lower frame and the middle frame;

or (b)

The positioning male/female heads are arranged on the upper frame or the lower frame or the middle frame and are matched with each other to ensure concentricity precision of the upper frame, the lower frame and the middle frame;

or (b)

The device comprises an upper frame, a middle frame, a cambered surface or a positioning surface, and a cambered surface or a positioning surface, wherein the cambered surface or the positioning surface is arranged between the upper frame and the middle frame and used for mutually matching and ensuring concentricity precision, and the cambered surface or the positioning surface is arranged between the lower frame and the middle frame and used for mutually matching and ensuring concentricity precision.

According to some embodiments of the utility model, the upper frame and the lower frame have hollow structures penetrating through the upper circuit board and the components on the photocell board, and the upper circuit board and the photocell board are installed with the components facing the inner side of the supporting part.

According to some embodiments of the utility model, the upper circuit board is provided with a mounting through hole, the upper circuit board is mounted on the upper frame through the mounting through hole by using a fastener, the photocell board is provided with a mounting hole, and the photocell board is mounted on the lower frame through the mounting hole by using a fastener.

According to some embodiments of the utility model, the bearing inner ring is fixedly mounted with the outer wall of the cylindrical support part by means of bonding.

According to some embodiments of the utility model, the shaft holes include an upper shaft hole in which the motor shaft is mounted and a lower shaft hole for a locking screw for locking the encoder to the motor shaft, the locking screw being engaged with a locking screw hole opened at an end face of the motor shaft.

Further, the hole diameter of the lower shaft hole is larger than that of the locking threaded hole, and the inner wall of the lower shaft hole is a smooth hole or a hole with internal threads, as shown in fig. 8.

Still further, the lower shaft hole includes a countersunk hole for receiving the head of the locking screw, as shown in fig. 8.

Further, the upper frame and the middle frame are integrally formed, the lower frame is cooperatively connected with the middle frame, or the lower frame is integrally formed with the middle frame, and the upper frame is cooperatively connected with the middle frame, wherein when the upper frame and the middle frame or the lower frame and the middle frame are integrally formed, the lower frame and the middle frame are only required to be locked through a positioning part and a screw, or the upper frame and the middle frame are locked through the positioning part and the screw, so that the positioning precision is ensured, and the tight combination of the three is ensured.

Further, the upper frame and the lower frame are respectively in step fit with the middle frame, the lower surface of the step structure of the upper frame is matched with the upper surface of the middle frame, the upper surface of the step structure of the lower frame is matched with the lower surface of the middle frame, and fastening pieces are arranged at the step fit positions of the upper frame, the lower frame and the middle frame to be connected with each other, as shown in fig. 7.

Still further, the upper frame and the lower frame are provided with mating countersunk holes at the positions corresponding to the mating positions, the heads of the fasteners are provided in the mating countersunk holes, and the threaded portions of the fasteners are mated with threaded holes at the positions corresponding to the mating positions of the middle frame, as shown in fig. 7.

Any reference to "one embodiment," "an exemplary embodiment," etc., means that a particular element, structure, or feature described in connection with the embodiment is included in at least one embodiment of the utility model. This schematic representation throughout this specification does not necessarily refer to the same embodiment. Moreover, when a particular element, structure, or feature is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such element, structure, or feature in connection with other ones of the embodiments.

While the detailed description of the utility model has been made with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this utility model. In particular, reasonable variations and modifications are possible in the component parts, modules and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the claims without departing from the spirit of the utility model. Except insofar as variations and modifications in parts, modules and/or arrangements are limited by the appended claims and the equivalents thereof.

Claims

1. An ultrathin encoder is characterized by comprising a supporting part arranged on a motor shaft, wherein the supporting part comprises a cylindrical supporting part provided with a shaft hole for installing the motor shaft, a bearing is arranged on the outer wall of the cylindrical supporting part, and a flange plate is positioned in the middle of the outer wall of the cylindrical supporting part; the upper bearing and the lower bearing are arranged on the cylindrical supporting part and on the upper side and the lower side of the flange plate, an upper frame matched with the outer end face and the outer side wall of the outer ring of the upper bearing, a lower frame matched with the outer end face and the outer side wall of the outer ring of the lower bearing, and a middle frame matched with the upper frame and the lower frame, wherein the inner rings of the upper bearing and the lower bearing are arranged on the cylindrical supporting part, the upper frame and the lower frame are arranged on the outer rings of the upper bearing and the lower bearing through respective center holes, the lower end face of the flange plate is fixedly connected with the code wheel, and the upper frame is fixedly connected with the lower frame and the middle frame.

2. The ultra-thin encoder of claim 1, wherein the upper frame has an upper circuit board mounted on an upper side thereof and the lower frame has a photovoltaic panel mounted on a lower side thereof.

3. The ultra-thin encoder of claim 1, wherein the shaft bore is an internally threaded bore having internal threads for locking engagement with the motor shaft.

4. An ultra-thin encoder according to claim 3, wherein the internally threaded bore is located at one end of the shaft bore, the internally threaded bore is part of the shaft bore, the externally threaded bore has an outer end that is coincident with the outer end of the shaft bore, and the other end of the internally threaded bore is located inside the shaft bore.

5. The ultra-thin encoder of claim 1, wherein the flange has a raised structure at the outer edge for securing the code wheel, the flange between the raised structure and the cylindrical support forming an annular groove structure.

6. The ultra-thin encoder of claim 1, wherein the upper and lower frames and the middle frame have a positioning structure for ensuring concentricity for mutual engagement, and locking members for locking and fixing are provided between the upper and lower frames and the middle frame.

7. The ultra-thin encoder of claim 6, wherein the positioning structure comprises positioning holes and positioning columns, wherein the positioning holes are formed on the upper frame, the lower frame or the middle frame and are matched with each other to ensure concentricity precision of the upper frame, the lower frame and the middle frame;

or (b)

8. The ultra-thin encoder of claim 2, wherein the upper and lower frames have hollowed structures passing through the upper circuit board and the components on the photocell board, and the upper circuit board and the photocell board have components mounted on the inner side of the support member facing the upper circuit board and the photocell board.

9. The ultra-thin encoder of claim 2, wherein the upper circuit board has mounting holes through which the upper circuit board is mounted to the upper frame using fasteners, and the photocell board has mounting holes through which the photocell board is mounted to the lower frame using fasteners.

10. The ultra-thin encoder of claim 1, wherein the bearing inner race is fixedly mounted to the outer wall of the cylindrical support portion by means of adhesive.

11. The ultra-thin encoder of claim 1, wherein the shaft hole comprises an upper shaft hole for mounting the motor shaft and a lower shaft hole for a locking screw for locking the encoder to the motor shaft, the locking screw being engaged with a locking screw hole formed in an end face of the motor shaft.

12. The ultra-thin encoder of claim 11, wherein the lower shaft bore has a larger bore diameter than the locking threaded bore diameter, and the lower shaft bore inner wall is a smooth bore or a bore with internal threads.

13. The ultra-thin encoder of claim 11, wherein the lower shaft bore includes a counterbore for carrying the locking screw head.

14. The ultra-thin encoder of claim 1, wherein the upper frame and the middle frame are integrally formed, the lower frame and the middle frame are cooperatively coupled, or the lower frame and the middle frame are integrally formed, and the upper frame and the middle frame are cooperatively coupled.

15. The ultra-thin encoder of claim 1, wherein the upper frame and the lower frame are respectively in step fit with the middle frame, the lower surface of the upper frame step structure is fit with the upper surface of the middle frame, the upper surface of the lower frame step structure is fit with the lower surface of the middle frame, and fasteners are arranged at the step fit positions of the upper frame and the lower frame and the middle frame.

16. The ultra-thin encoder of claim 15, wherein the upper frame and the lower frame are provided with mating counter bores corresponding to the mating locations, the heads of the fasteners are provided in the mating counter bores, and the threaded portions of the fasteners mate with threaded bores of the middle frame corresponding to the mating locations.