Electronic actuator magnet fixing structure

Abstract

The utility model relates to a magnet fixing structure of an electronic actuator. The magnet fixing structure comprises an output shaft; a magnet mounting groove is formed in the end part of the half tooth, and a magnet is arranged in the magnet mounting groove; the magnet protection cover covers the magnet; a supporting convex part is arranged on the bottom surface in the magnet mounting groove, the supporting convex part is used for ensuring the horizontal position of the magnet and isolating complete contact between the magnet and the magnet mounting groove, a plurality of positioning convex parts are arranged on the side wall in the magnet mounting groove, and the outer side wall of the magnet is in contact with the positioning convex parts; a plurality of first welding protrusions are arranged on the end face, away from the output shaft, of the half gear and used for being welded to the magnet protection cover. The magnet fixing structure of the electronic actuator does not need an additional magnetizing process, is convenient to install, ensures that the magnet (including magnetism) is not damaged in the whole temperature working interval, and simplifies the complexity of the magnet installation process; and the magnet material selection cost and the production / assembly cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a magnet fixing structure for an electronic actuator. Background Art

[0002] An actuator is an essential and important component in an automatic control system. Its function is to receive the control signal sent by the controller, change the size of the controlled medium, so as to maintain the controlled variable at the required value or within a certain range.

[0003] Among them, the magnets in an electronic actuator are usually fixed in two ways:

[0004] 1. Overmolding co - forming, that is, the shaft and the magnet are placed in a plastic injection mold, and then plastic is injected. By filling the mold, it will provide the necessary connection between the two metal parts, and at the same time, a toothed wheel will be formed for motion transmission. The disadvantage of this solution is the potential demagnetization of the permanent magnet due to the exposure of the large metal volume represented by the injection mold; therefore, in order to overcome the demagnetization problem, magnetization must be carried out after the molding process, but if the investment required for the magnetizer is to be limited, this severely restricts the range of materials that can be used.

[0005] 2. Bonding with epoxy glue or resin; however, this solution has limitations in use in terms of temperature and vibration. Even where there are no such problems, it will bring high costs and complexity in the production process due to the particularity of specific applications. Summary of the Utility Model

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the problem that there are certain defects in both the overmolding co - forming and the bonding with epoxy glue or resin in fixing the magnet of the electronic actuator in the prior art.

[0007] To solve the above - mentioned technical problem, the utility model provides a magnet fixing structure for an electronic actuator, including: an output shaft; a half - tooth sleeved on one end of the output shaft, a magnet mounting groove is provided at the end of the half - tooth far from the output shaft, and a magnet is arranged in the magnet mounting groove; a magnet protection cover connected to the end of the half - tooth provided with the magnet mounting groove, and the magnet protection cover covers the magnet; a support protrusion is provided on the bottom surface inside the magnet mounting groove, which is used to ensure the horizontal position of the magnet and at the same time isolate the magnet from complete contact with the magnet mounting groove, a plurality of positioning protrusions are provided on the side wall inside the magnet mounting groove, and the outer side wall of the magnet is in contact with the plurality of positioning protrusions, and a plurality of welding protrusions I are provided on the end surface of the half - tooth far from the output shaft, and the welding protrusions I are used for welding with the magnet protection cover.

[0008] In an embodiment of the present utility model, a bushing is provided in the middle of the semi-tooth. An output shaft mounting groove is provided at the center of one end of the bushing, and one end of the output shaft is disposed in the output shaft mounting groove.

[0009] In an embodiment of the present utility model, the output shaft is cylindrical, and an annular groove is provided on the outer wall of one end of the output shaft extending into the output shaft mounting groove.

[0010] In an embodiment of the present utility model, an annular protrusion is provided on the inner wall of the output shaft mounting groove, and the annular protrusion is disposed in the annular groove.

[0011] In an embodiment of the present utility model, the magnet is in the shape of a rectangular block, the magnet mounting groove is a rectangular groove, and the cross-sectional area of the magnet mounting groove is larger than the cross-sectional area of the magnet.

[0012] In an embodiment of the present utility model, the number of the support protrusions is set to four, and support protrusions are provided on four sides of the bottom surface of the magnet mounting groove.

[0013] In an embodiment of the present utility model, two positioning protrusions are provided on each of the four side walls of the magnet mounting groove, and the positioning protrusions are arc-shaped.

[0014] In an embodiment of the present utility model, the cross-section of the first welding protrusion is triangular, and the first welding protrusions are provided at the positions of the four sides of the magnet mounting groove.

[0015] In an embodiment of the present utility model, the magnet protection cover is in the shape of a round cover, and a circular groove is provided at one end of the magnet protection cover. A second welding protrusion is provided on the bottom surface of the circular groove. The second welding protrusion is circular ring-shaped and is used for welding with the semi-tooth.

[0016] In an embodiment of the present utility model, one end of the bushing is disposed in the circular groove.

[0017] The above technical solution of the present utility model has the following beneficial effects compared with the prior art:

[0018] For the magnet fixing structure of the electronic actuator of the present utility model, by providing a groove structure on the semi-tooth for accommodating the magnet, and at the same time providing a structure of support and positioning protrusions on the bottom surface and inner wall of the magnet placement groove, the magnet can be supported and positioned. Finally, with the cooperation of the welded magnet protection cover, the magnet is stably fixed. No additional magnetizing process is required, which is convenient for installation and ensures that the magnet (including its magnetism) is not damaged in the entire temperature working range, simplifies the complexity of the magnet installation process, reduces the cost of magnet material selection and production / assembly costs. Description of the Drawings

[0019] To make the content of the present utility model easier to be clearly understood, the following further elaborates on the present utility model in detail according to the specific embodiments of the present utility model and in combination with the attached drawings, where

[0020] Figure 1 is a schematic structural view of the magnet fixing structure of the electronic actuator in the preferred embodiment of the present utility model;

[0021] Figure 2 is a top view of the magnet fixing structure of the electronic actuator in the preferred embodiment of the present utility model;

[0022] Figure 3 is in the preferred embodiment of the present utility model Figure 2 is a sectional view taken along the line A-A;

[0023] Figure 4 is a schematic structural view of the magnet fixing structure of the electronic actuator in the preferred embodiment of the present utility model Figure 1 ;

[0024] Figure 5 is a schematic structural view of the magnet fixing structure of the electronic actuator in the preferred embodiment of the present utility model Figure 2 ;

[0025] Figure 6 is a schematic structural view of the magnet protection cover in the preferred embodiment of the present utility model.

[0026] Explanation of the reference numerals in the drawings of the specification: output shaft 1, annular groove 11, semi-tooth 2, magnet mounting groove 21, support convex part 211, positioning convex part 212, first welding convex part 213, second circular groove 214, bushing 22, output shaft mounting groove 221, annular protrusion 222, magnet 3, magnet protection cover 4, V-shaped groove 41, second welding convex part 42. Specific embodiments

[0027] The following further explains the present utility model in combination with the attached drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0028] Refer to Figures 1 - 5As shown in the figure, the magnet fixing structure of the electronic actuator of the present utility model includes four parts: an output shaft 1, a half-tooth 2, a magnet 3, and a magnet protection cover 4; the half-tooth 2 is sleeved on one end of the output shaft 1, and a magnet installation groove 21 is provided at the end of the half-tooth 2 away from the output shaft 1, and a magnet 3 is provided in the magnet installation groove 21; the magnet protection cover 4 is connected to the end of the half-tooth 2 provided with the magnet installation groove 21, and the magnet protection cover 4 covers the magnet 3; a support convex portion 211 is provided on the bottom surface inside the magnet installation groove 21, and the support convex portion 211 is used to ensure the horizontal position of the magnet 3 and at the same time isolate the magnet 3 from complete contact with the magnet installation groove 21. A plurality of positioning convex portions 212 are provided on the side wall inside the magnet installation groove 21, and the outer side wall of the magnet 3 is in contact with the plurality of positioning convex portions 212. A plurality of first welding convex portions 213 are provided on the end surface of the half-tooth 2 away from the output shaft 1, and the first welding convex portions 213 are used for welding with the magnet protection cover 4.

[0029] In the above structure, a bushing 22 is provided in the middle of the half-tooth 2, and an output shaft installation groove 221 is provided at the center of one end of the bushing 22, and one end of the output shaft 1 is arranged in the output shaft installation groove 221. The magnet installation groove 21 is provided at the central position of the bushing 22, and the first welding convex portions 213 are provided on the end surface of the bushing 22.

[0030] Refer to Figure 3 As shown in the figure, the output shaft 1 is cylindrical, and an annular groove 11 is provided on the outer wall of one end of the output shaft 1 extending into the output shaft installation groove 221. An annular protrusion 222 is provided on the inner wall of the output shaft installation groove 221, and the annular protrusion 222 is arranged in the annular groove 11.

[0031] In the above structure, the magnet 3 is a rectangular block, the magnet installation groove 21 is a rectangular groove, and the cross-sectional area of the magnet installation groove 21 is larger than the cross-sectional area of the magnet 3.

[0032] In the above structure, the number of the support convex portions 211 is set to four, and the support convex portions 211 are provided on the four sides of the bottom surface of the magnet installation groove 21. The cross-section of the support convex portion 211 is rectangular, and the corners of the support convex portion 211 are provided with rounded corners. The height of the support convex portion 211 is higher than the bottom surface of the magnet installation groove 21. The support convex portion 211 ensures the horizontal position of the magnet and at the same time avoids contact of the whole surface to prevent the influence of deformation on the magnet 3 during the thermal cycle operation process.

[0033] In the above structure, two positioning convex portions 212 are provided on each of the four side walls of the magnet installation groove 21, and the positioning convex portions 212 are arc-shaped. The positioning convex portions 212 ensure that the magnet 3 will not bear excessive stress during the cycle of thermal expansion and contraction, but still maintain the pressure required for its correct connection.

[0034] In the above structure, the cross-section of the first welding convex part 213 is triangular, and the first welding convex parts 213 are provided at the positions of the four sides of the magnet mounting groove 21. The first welding convex part 213 is used to weld the magnet protection cover 4, and there are corresponding welding convex parts on the magnet protection cover 4. The magnet protection cover 4 not only prevents the axial sliding of the magnet 3 but also ensures that the magnet 3 is completely covered by the plastic. Moreover, the material protruding from the welding compensates for the axial tolerance between the magnet 3 and the valve seat and provides axial locking.

[0035] Refer to Figure 6 As shown, the magnet protection cover 4 is in the shape of a round cover, and a circular groove 41 is provided at one end of the magnet protection cover 4. A second welding convex part 42 is provided on the bottom surface of the circular groove 41. The second welding convex part 42 is arranged in a circular ring shape, and the second welding convex part 42 is used to weld with the half tooth 2. The cross-section of the second welding convex part 42 is triangular. One end of the bushing 22 is arranged in the circular groove 41. A second circular groove 214 is provided on the bottom surface of the magnet mounting groove 21. The second circular groove 214 is a process hole.

[0036] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. An electronic actuator magnet fixing structure, characterized in that: Comprising, An output shaft; A half-tooth, which is sleeved on one end of the output shaft. A magnet mounting groove is provided at the end of the half-tooth far from the output shaft, and a magnet is provided in the magnet mounting groove; A magnet protection cover, which is connected to the end of the half-tooth provided with the magnet mounting groove, and the magnet protection cover covers the magnet; A support protrusion is provided on the bottom surface inside the magnet mounting groove. The support protrusion is used to ensure the horizontal position of the magnet and at the same time isolate the magnet from complete contact with the magnet mounting groove. A number of positioning protrusions are provided on the inner side wall inside the magnet mounting groove. The outer side wall of the magnet is in contact with the number of positioning protrusions. A number of welding protrusions I are provided on the end surface of the half-tooth far from the output shaft. The welding protrusions I are used for welding with the magnet protection cover.

2. The electronic actuator magnet fixing structure according to claim 1, wherein: A bushing is provided in the middle of the half-tooth. An output shaft mounting groove is provided at the center of one end of the bushing. One end of the output shaft is arranged in the output shaft mounting groove.

3. The electronic actuator magnet fixing structure according to claim 2, characterized in that: The output shaft is cylindrical, and an annular groove is provided on the outer wall of the end of the output shaft extending into the output shaft mounting groove.

4. The electronic actuator magnet fixing structure according to claim 3, wherein: An annular protrusion is provided on the inner wall of the output shaft mounting groove, and the annular protrusion is arranged in the annular groove.

5. The electronic actuator magnet fixing structure according to claim 2, characterized in that: The magnet is a rectangular block, the magnet mounting groove is a rectangular groove, and the cross-sectional area of the magnet mounting groove is larger than the cross-sectional area of the magnet.

6. The electronic actuator magnet fixing structure according to claim 1, characterized in that: The number of the support protrusions is set to four, and the support protrusions are provided on all four sides of the bottom surface of the magnet mounting groove.

7. The electronic actuator magnet fixing structure according to claim 6, characterized in that: Two positioning protrusions are provided on each of the four side walls of the magnet mounting groove, and the positioning protrusions are arranged in an arc shape.

8. The electronic actuator magnet fixing structure according to claim 6, characterized in that: The cross-section of the welding protrusion I is triangular, and the welding protrusion I is provided at the positions of the four sides of the magnet mounting groove.

9. The electronic actuator magnet fixing structure according to claim 8, characterized in that: The magnet protection cover is in the shape of a round cover, and a circular groove is provided at one end of the magnet protection cover. A welding protrusion II is provided on the bottom surface of the circular groove. The welding protrusion II is arranged in a circular ring shape, and the welding protrusion II is used for welding with the half-tooth.

10. The electronic actuator magnet fixing structure according to claim 2, characterized in that: One end of the bushing is arranged in the circular groove.

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