Inductance type encoder

Abstract

The utility model discloses an inductance type encoder, which comprises a rotor, an encoder PCB (printed circuit board), a shell, a rear cover and pouring sealant, the encoder PCB is assembled in the shell, the pouring sealant is laid on the encoder PCB to seal the encoder PCB in the shell, and the rear cover is arranged in the shell. The rear cover covers the pouring sealant and is assembled and fixed with the shell, and the rotor is arranged on the outer surface of the shell; a motor shaft hole of the inductance type encoder sequentially penetrates through the rotor, the shell, the encoder PCB, the pouring sealant and the rear cover. The inductive encoder provided by the utility model has better waterproof and oil-proof functions, and can be applied to motor and gearbox oil more safely and stably.

Description

Technical Field

[0001] The utility model relates to an inductive encoder, belonging to the technical field of encoders. Background Art

[0002] For the existing inductive encoder, its PCB board is exposed without protection. When it is applied to a motor, since there is moisture inside the motor, it is easy to cause damage or burnout of the electronic components on the PCB; in addition, when the inductive encoder is applied to the transmission oil, since there are many metal gears in the transmission and there are metal impurities in the transmission oil, it is easy to cause burnout of the components of the inductive encoder. Summary of the Utility Model

[0003] In view of this, the utility model provides an inductive encoder with a protective structure design to solve the problems existing in the above-mentioned prior art.

[0004] The utility model solves the above problems through the following technical solutions:

[0005] An inductive encoder includes a rotor, an encoder PCB board, a housing, a rear cover and potting glue. The encoder PCB board is assembled in the housing. The potting glue is applied on the encoder PCB board to seal the encoder PCB board in the housing. The rear cover is covered on the potting glue and is assembled and fixed with the housing. The rotor is arranged on the outer surface of the housing. The motor shaft hole of the inductive encoder sequentially penetrates through the rotor, the housing, the encoder PCB board, the potting glue and the rear cover.

[0006] Further, several convex parts are formed outward on the side wall of the housing, and a positioning structure is arranged on each convex part for installation and positioning when the inductive encoder is installed on the motor housing.

[0007] Further, the positioning structure includes a through hole opened on the convex part and a rigid sleeve fixed in the through hole.

[0008] Further, the housing is injection-molded. The rigid sleeve includes a cylindrical part with the same shape as the through hole and annular flanging parts at both ends. The rigid sleeve is connected and fixed with the through hole during the injection molding process of the housing, so that the cylindrical part is located in the through hole, and at the same time, the annular flanging parts at both ends are respectively pressed on the surfaces of the convex parts outside the two ends of the through hole.

[0009] Further, the rigid sleeve is a metal sleeve formed by integral stamping, and several holes are opened in the cylindrical part for the injection molding material to get stuck in the several holes during the injection molding process of the housing to prevent the rigid sleeve from slipping in the through hole.

[0010] Further, a plurality of positioning posts are convexly provided on the inner side of the housing for positioning when the encoder PCB board is assembled in the housing.

[0011] Further, a plurality of positioning holes adapted to the plurality of positioning posts are provided on the encoder PCB board.

[0012] Further, a groove-like structure adapted to the electronic wires of the encoder PCB board is formed on the side wall of the housing, and the electronic wires are pressed in the groove-like structure and led out to the outside of the housing.

[0013] Further, the groove-like structure includes a plurality of card slots arranged at intervals in a row, and each card slot is correspondingly pressed with one of the electronic wires.

[0014] Further, the wall thickness of the housing is 0.4 ± 0.1 mm.

[0015] The beneficial effects of the technical solution of the present utility model are reflected in that: the encoder PCB board is fixedly sealed in a housing by potting glue, and then a rear cover is assembled with the housing by reverse buckling to form external protection. In this way, the inductive encoder of the present utility model can be better protected and can work in high-temperature and high-humidity environments, and the risk of damage can also be reduced in gearbox oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 and Figure 2 are schematic views of the inductive encoder according to an embodiment of the present utility model from different perspectives;

[0017] Figure 3 is a schematic view of the inductive encoder according to an embodiment of the present utility model without the rear cover installed.

[0018] Figure 4 is an exploded view of the structure of the inductive encoder according to an embodiment of the present utility model.

[0019] Figure 5 is a top view of the housing of the inductive encoder according to an embodiment of the present utility model.

[0020] Description of the reference numerals: a110 - rotor, a120 - housing, a121 - positioning post, a122 - convex part, a123 - through hole, a124 - card slot, a130 - iron sleeve, a140 - electronic wire, a150 - encoder PCB board, a160 - potting glue, a170 - rear cover, 100 - induction surface, 200 - motor shaft hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described below in conjunction with the drawings, specific embodiments and examples. The purpose of providing the examples is only for illustration and not for any limitation.

[0022] Please refer to Figures 1 to 4 , an inductive encoder provided by an embodiment of the present utility model includes a rotor a110, a housing a120, an iron sleeve a130, an electronic wire a140, an encoder PCB board a150, potting glue a160, and a rear cover a170; as Figure 3 , the encoder PCB board a150 is assembled in the housing a120; as Figure 4 , the potting glue a160 is applied on the encoder PCB board a150 to seal the encoder PCB board a150 in the housing a120, and the rear cover a170 is covered on the potting glue a160 and assembled and fixed with the housing a120; as Figure 2 and Figure 4 , the rotor a110 is arranged on the outer surface of the housing a120. The inductive encoder of the embodiment of the present invention can be used for a motor, such as Figure 5 , the bottom surface 100 of the housing is an induction surface, and the rotor a110 is arranged outside the induction surface; when the inductive encoder is connected to the motor, it is sleeved on the motor shaft through a motor shaft hole 200 that sequentially penetrates the rotor a110, the housing a120, the encoder PCB board a150, the potting glue a160, and the rear cover a170 and is coaxial and of the same diameter.

[0023] In order to facilitate positioning when installed on the motor housing, in some preferred embodiments, the inductive encoder of the present utility model can be further provided with a positioning structure. Specifically, please refer to Figures 1 to 3 and Figure 5 , several parts of the side wall of the housing a120 protrude outward to form a plurality of convex parts a122, and each convex part a122 is respectively provided with a positioning structure, which can be used for installation positioning when the inductive encoder is installed on the motor housing. In some preferred embodiments, the positioning structure includes a through hole a123 opened on the convex part and an iron sleeve a130 fixed to the through hole. The iron sleeve a130 is integrally formed by stamping, and includes a cylindrical part having the same shape as the through hole a123 and annular flanging parts at both ends of the cylindrical part. The iron sleeve a130 is assembled with the through hole a123 during the injection molding process of the housing a120, that is, when injection molding, the iron sleeve is placed at a predetermined position (corresponding to the position of the through hole) in the mold, and then injection molding is performed to form the housing. In this way, the cylindrical part of the iron sleeve is located in the through hole a123, and at the same time, the annular flanging parts at both ends of the iron sleeve are respectively pressed on the surfaces of the convex parts outside the two ends of the through hole, realizing the assembly and fixation with the housing. More preferably, a plurality of small holes are opened in the cylindrical part of the iron sleeve, and when the housing is injection molded, the injection molding material can be stuck at these small holes, which can prevent the iron sleeve assembled at the through hole from slipping.

[0024] It should be understood that the iron sleeve can also be replaced with a copper sleeve, or other metal materials with equivalent hardness can also be used. The present utility model does not limit this, as long as it is a rigid sleeve with a hardness similar to that of copper and iron.

[0025] In addition, the formation of three groups of positioning structures on the side wall of the housing shown in the figure is only an example. The present utility model is not limited to three groups, and may also be two groups, four groups, etc.

[0026] Reference Figure 3 and Figure 5 For the convenience of positioning when the encoder PCB board a150 is assembled into the housing a120, in some specific embodiments, a plurality of positioning posts a121 are convexly provided on the inner side of the housing 120. Correspondingly, a plurality of positioning holes adapted to the plurality of positioning posts may be formed at corresponding positions on the encoder PCB board a150.

[0027] Continuing to refer to Figure 3 and Figure 5 One end of the electronic wire a140 of the encoder PCB board is welded to the encoder PCB board, and the other end is led out to the outside of the housing a120 to be connected to an external circuit; a groove-like structure adapted to the electronic wire a140 is formed on the side wall of the housing a120, and the electronic wire is pressed in the groove-like structure and led out to the outside of the housing. Specifically, the groove-like structure includes a plurality of card slots a124 arranged at intervals in a row, and one electronic wire is correspondingly pressed into each card slot a124.

[0028] In a preferred embodiment, the housing a120 adopts an ultra-thin design with a wall thickness of 0.4 ± 0.1 mm. Such a design is considered because if the housing a120 is too thick, the induction distance of the encoder will become shorter, and it is difficult to meet the existing industry installation requirements when it is too short.

[0029] The production and assembly process of the inductive encoder according to the embodiment of the present utility model: injection molding to form the housing a120 assembled with an iron sleeve; welding the electronic wire a140 to the encoder PCB board a150, putting the welded encoder PCB board a150 into the housing a120, and then performing potting to form potting glue a160. When the potting glue is not dry, assemble the rear cover a170 to ensure that the rear cover and the housing are fully sealed, and the rear cover a170 and the housing a120 are assembled in an inverted manner to prevent falling off; the rotor a110 and the above-assembled parts are sleeved on the motor shaft together, and the rotor a110 is closely attached to the induction surface of the housing a120.

[0030] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those skilled in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several equivalent substitutions or obvious modifications can still be made, and as long as the performance or use is the same, it should be regarded as belonging to the protection scope of the present utility model.

Claims

1. An inductive encoder, characterized in that: It includes a rotor, an encoder PCB board, a housing, a rear cover and potting glue. The encoder PCB board is assembled in the housing. The potting glue is laid on the encoder PCB board to seal the encoder PCB board in the housing. The rear cover is covered on the potting glue and fixedly assembled with the housing. The rotor is arranged on the outer surface of the housing. The motor shaft hole of the inductive encoder sequentially penetrates through the rotor, the housing, the encoder PCB board, the potting glue and the rear cover.

2. The inductive encoder according to claim 1, characterized in that: A plurality of convex portions are formed outward on the side wall of the housing, and a positioning structure is provided on each convex portion. The positioning structure is used for installation positioning when the inductive encoder is installed on the motor housing.

3. The inductive encoder according to claim 2, wherein: The positioning structure includes a through hole opened on the convex portion and a rigid sleeve fixed in the through hole.

4. The inductive encoder according to claim 3, wherein: The housing is injection molded. The rigid sleeve includes a cylindrical portion having the same shape as the through hole and annular flanging portions at both ends. The rigid sleeve is connected and fixed to the through hole during the injection molding process of the housing, so that the cylindrical portion is located in the through hole, and at the same time, the annular flanging portions at both ends are respectively pressed on the surfaces of the convex portions outside the two ends of the through hole.

5. The inductive encoder according to claim 4, characterized in that: The rigid sleeve is a metal sleeve formed by integral stamping, and a plurality of holes are opened in the cylindrical portion for the injection molding material to be stuck in the plurality of holes during the injection molding process of the housing to prevent the rigid sleeve from slipping in the through hole.

6. The inductive encoder according to claim 1, characterized in that: A plurality of positioning posts are convexly provided on the inner side of the housing for positioning when the encoder PCB board is assembled in the housing.

7. The inductive encoder according to claim 6, wherein: A plurality of positioning holes adapted to the plurality of positioning posts are opened on the encoder PCB board.

8. The inductive encoder according to claim 1, wherein: A groove-like structure adapted to the electronic wires of the encoder PCB board is formed on the side wall of the housing, and the electronic wires are pressed in the groove-like structure and led out to the outside of the housing.

9. The inductive encoder according to claim 8, wherein: The groove-like structure includes a plurality of card slots arranged at intervals in a row, and one of the electronic wires is correspondingly pressed into each card slot.

10. The inductive encoder according to claim 1, wherein: The wall thickness of the housing is 0.4 ± 0.1 mm.

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