Electric trolley and motor structure thereof

Abstract

The utility model relates to electric push rod and motor structure thereof, a kind of motor structure includes motor shell, stator assembly, magnetic ring, rotating shaft, control circuit board and fixed sleeve, one end of fixed sleeve is fixed with first half shell, the control circuit board and stator assembly are sequentially fixed in fixed sleeve, the rotating shaft rotation is arranged in fixed sleeve, and both ends are projected fixed sleeve, magnetic ring is fixed on the inner wall of motor shell, and it is set in stator assembly outside, one end of the rotating shaft is fixed with motor shell. The utility model's motor uses outer rotor design: magnetic ring is fixed in motor shell inner wall (outer rotor), rotating shaft directly drives shell, and torque transmission is more direct, and response is fast. The fixed sleeve in the utility model motor bears stator framework, bearing support body and circuit board pedestal triple function simultaneously, eliminates the cumulative error of multiple components assembly, ensures air gap uniformity;While overall integration is high, installation space is saved, and motor axial length is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of electric linear actuator technology, and particularly relates to an electric linear actuator and its motor structure. Background Technology

[0002] Electric linear actuators are general-purpose auxiliary drive devices widely used in various industries. They convert the rotary motion of an electric motor into the linear reciprocating motion of a linear actuator, serving as a mechanical actuator for remote, centralized, or automated control. The main working principle of an electric linear actuator is that a motor drives a lead screw to rotate, with a transmission nut mounted on the lead screw. The rotation of the lead screw drives the transmission nut to reciprocate.

[0003] Traditional electric linear actuators typically employ a split motor structure, where the stator assembly is directly fixed to the motor housing, and the rotor assembly is supported within the housing by bearings. This structure has the following inherent drawbacks: High assembly precision requirements: The air gap between the stator and rotor needs to be ensured through the machining precision of the housing and the coaxiality of multiple bearings. Cumulative tolerances can easily lead to eccentric vibration, reducing motor efficiency and lifespan. Unstable circuit board installation: Control circuit boards are mostly suspended and fixed inside the housing by brackets. High-frequency vibration during motor operation can easily cause fatigue fracture of solder joints, affecting reliability. Existing technologies have not overcome the limitations of the split support structure: The stator, bearing housing, and circuit board are still independent components, relying on the housing for final positioning, resulting in a large structural volume and complex assembly process. Utility Model Content

[0004] To solve the above-mentioned technical problems, the first objective of this utility model is to provide a compact motor structure suitable for electric linear actuator assembly, and the second objective of this utility model is to provide an electric linear actuator.

[0005] To achieve the objective of the first utility model mentioned above, the present utility model adopts the following technical solution: An electric motor structure includes a motor housing, a stator assembly, a magnetic ring, a rotating shaft, a control circuit board, and a fixing sleeve. One end of the fixing sleeve is fixed to a first half-shell. The control circuit board and the stator assembly are sequentially sleeved and fixed on the fixing sleeve. The rotating shaft is rotatably disposed in the fixing sleeve, with both ends extending out of the fixing sleeve. The magnetic ring is fixed to the inner wall of the motor housing and sleeved outside the stator assembly. One end of the rotating shaft is fixed to the motor housing.

[0006] As a preferred embodiment, a plurality of positioning posts A are spaced apart on the outer wall of one end of the fixed sleeve, and the first half shell is provided with corresponding through holes. The positioning posts A are inserted into the corresponding through holes, and connecting ears are provided between adjacent positioning posts A. The fixing bolt passes through the first half shell and is fastened to the connecting ears.

[0007] As a preferred embodiment, one side of the connecting ear is a threaded hole, and the other side is a positioning post B. The control circuit board has a corresponding positioning hole, and the fixing sleeve is also fitted with a retaining ring. The retaining ring abuts against the control circuit board, so that the positioning post B is inserted into the positioning hole.

[0008] As a preferred embodiment, the two ends of the rotating shaft and the fixed sleeve are rotatably connected by bearings A and B, respectively, and a concave ring is provided on the outside of bearings A and B on the rotating shaft. An open retaining ring is provided inside the concave ring to prevent axial displacement of the bearing.

[0009] As a preferred embodiment, both ends of the fixed sleeve are provided with stepped surfaces, and the bearings A and B are embedded in the fixed sleeve and abut against one side of the stepped surface, while the other side abuts against the open retaining ring.

[0010] As a preferred embodiment, one end of the rotating shaft is inserted and fixed in the center of the motor housing, and an axially extending rib is provided on the side wall at the insertion point between the rotating shaft and the motor housing.

[0011] To achieve the second objective mentioned above, this utility model adopts the following technical solution: An electric linear actuator includes a actuator sleeve, a linear actuator, a lead screw assembly, a housing, and a motor. The motor is as described in any of the above descriptions. The lead screw assembly includes a lead screw and a nut, with the nut threaded onto the lead screw. The linear actuator is fixed to the nut. The actuator sleeve is fitted over the linear actuator, with the linear actuator extending from one end of the actuator sleeve. The housing is fixed to the other end of the actuator sleeve. The lead screw is inserted into the housing. The motor is fixed to the housing, with its shaft extending into the housing. The motor drives the lead screw to rotate through gear meshing, thereby driving the linear actuator on the lead screw to perform telescopic movement.

[0012] As a preferred embodiment, a retaining ring is provided on one side of the housing, the motor is located inside the retaining ring and is fixed by fixing bolts, and the retaining ring is also fitted with a buckle cover.

[0013] As a preferred embodiment, the nut includes a guide block and a threaded post disposed on the guide block. At least one side of the guide block is provided with a guide groove, and the inner wall of the push rod sleeve is provided with a guide strip. The guide strip cooperates with the guide groove, so that the guide block slides along the length direction of the push rod sleeve.

[0014] As a preferred embodiment, one end of the push rod sleeve is also fixed with a push rod sleeve cover, and one end of the push rod is inserted into the push rod sleeve cover.

[0015] The motor of this invention adopts an external rotor design: the magnetic ring is fixed to the inner wall of the motor housing (external rotor), and the rotating shaft directly drives the housing, resulting in more direct torque transmission and faster response. The fixing sleeve in the motor of this invention simultaneously serves as the stator frame, bearing support, and circuit board base, eliminating accumulated errors in the assembly of multiple components and ensuring uniform air gap; at the same time, the overall integration is high, saving installation space and reducing the axial length of the motor. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 and Figure 3 These are two different exploded structural diagrams of this utility model; Figure 4 and Figure 5 This is a schematic diagram of the installation structure of the first half-shell, the cover, and the motor at two different angles of this utility model; Figure 6 This is a schematic diagram of the motor structure of this utility model; Figure 7 and Figure 8 These are two different angles showing the exploded structure of the motor according to this utility model; Figure 9 This is a structural schematic diagram of the push rod sleeve, push rod, lead screw, nut, and gear components of this utility model; Figure 10 This is a partial structural diagram of the push rod sleeve, push rod, lead screw, nut, and gear components of this utility model.

[0018] The attached figures are labeled as follows: 11, first half-shell; 111, retaining ring; 112, fixing bolt; 113, gear limiting part; 114, motor shaft through hole; 115, bearing limiting part; 12, second half-shell; 13, cover; 2, motor; 21, motor housing; 22, stator assembly; 23, rotor; 24, rotating shaft; 241, concave ring; 242, convex rib; 25, control circuit board; 251, positioning hole; 26, fixing sleeve; 261, positioning post A; 27, bearing A; 28, open retaining ring; 29, connecting ear; 291, positioning post B; 210, retaining ring; 211, bearing B; 3, lead screw; 31, nut; 311, guide groove; 32, push rod; 321, push rod plug; 33, gear; 34, support bearing; 4, push rod sleeve; 41, push rod sleeve cover; 42, limiting notch. Detailed Implementation

[0019] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figures 1 to 5 As shown, the electric linear actuator includes a linear actuator sleeve 4, a linear actuator 32, a lead screw assembly, a housing, and a motor 2. The lead screw assembly includes a lead screw 3 and a nut 31. One end of the lead screw 3 is fixed with a support bearing 34, the outer ring of which is fixed in the housing. The nut 31 is threaded onto the lead screw 3. One end of the linear actuator 32 is fixed to the nut 31. The linear actuator sleeve 4 is fitted over the linear actuator 32, with one end of the linear actuator 32 extending out of the sleeve 4. The housing includes a first half-shell 11 and a second half-shell 1. 2. The first half-shell 11 and the second half-shell 12 are respectively fastened to both sides of one end of the push rod sleeve 4, and the first half-shell 11 and the second half-shell 12 clamp and fix the push rod sleeve 4; the motor 2 is fixed on the first half-shell 11, and the motor shaft passes through the first half-shell 11. A drive gear is fixed on the motor shaft, and a gear 33 is also fixed on the inner side of the support bearing 34 on the lead screw 34. The motor 2 drives the lead screw 3 to rotate through the meshing transmission of the drive gear and the gear 33, and then drives the push rod 32 on the lead screw 3 to perform telescopic movement.

[0026] The aforementioned structure enables modular assembly: the separate snap-fit ​​design of the first and second half-shells simplifies the assembly process of the push rod sleeve and motor assembly, reducing production difficulty; it also makes power transmission more efficient: power is output from the motor, through the drive gear, gear to lead screw transmission chain, avoiding radial sway of the push rod and ensuring linearity of the telescopic movement; in addition, the above structure also optimizes the bearing support: the outer ring of the support bearing is fixed to the housing, while the inner ring rotates with the lead screw, effectively distributing axial load and extending the lead screw's life. The motor is fixed to the first half-shell, and the gear is built into the housing, reducing the overall volume and making the layout more compact.

[0027] The first half-shell 11 is also provided with a gear limiting part 113 and a bearing limiting part 115. One end of the gear limiting part 113 is also provided with a motor shaft through hole 114. The limiting part constrains the position of the gear and the bearing, ensuring a constant meshing depth between the drive gear and the gear 33, and avoiding tooth disengagement or jamming.

[0028] A retaining ring 111 is also provided on one side of the first half-shell 11. The motor 2 is located inside the retaining ring 111 and is fixed by a fixing bolt 112. The retaining ring 111 is also fitted with a cover 13. The retaining ring restricts the radial displacement of the motor, and the cover isolates dust and liquid from entering, improving the IP protection level of the motor. At the same time, maintenance is more convenient: the motor can be inspected by removing the cover without disassembling the entire push rod.

[0029] like Figures 6 to 8 As shown, the motor 2 includes a motor housing 21, a stator assembly 22, a magnetic ring 23, a rotating shaft 24, a control circuit board 25, and a fixing sleeve 26. One end of the fixing sleeve 26 is fixed to the first half-shell 11. The control circuit board 25 and the stator assembly 22 are sequentially sleeved and fixed on the fixing sleeve 26. The rotating shaft 24 is rotatably disposed in the fixing sleeve 26, and both ends extend out of the fixing sleeve 26. The magnetic ring 23 is fixed on the inner wall of the motor housing 21 and sleeved on the outside of the stator assembly 22. One end of the rotating shaft 24 is fixed to the motor housing 21.

[0030] The motor adopts an external rotor design: the magnetic ring is fixed to the inner wall of the motor housing (external rotor), and the shaft directly drives the housing, resulting in more direct torque transmission and faster response. In the above structure, a fixing sleeve serves as the mounting base for components such as the stator assembly, circuit board, and shaft, achieving high overall integration, saving installation space, and reducing the axial length of the motor.

[0031] Multiple positioning posts A261 are spaced apart on the outer wall of one end of the fixed sleeve 26. The first half-shell 11 has corresponding through holes, and the positioning posts A261 are inserted into the corresponding through holes. Connecting ears 29 are also provided between adjacent positioning posts A261. The fixing bolt 112 passes through the first half-shell 11 and is fastened to the connecting ears 29. The positioning posts A261 are inserted into the through holes of the first half-shell to ensure the coaxiality of the motor and the drive gear and reduce transmission wear. The connecting ears cooperate with the fixing bolt to distribute vibration stress and prevent the motor from loosening.

[0032] One side of the connecting ear 29 has a threaded hole, and the other side has a positioning post B291. The control circuit board 25 has a corresponding positioning hole 251. The fixing sleeve 26 also has a retaining ring 210, which abuts against the control circuit board 25, so that the positioning post B291 is inserted into the positioning hole 251. One side of the connecting ear is used to fix the motor to the housing, and the other side is inserted into the positioning hole of the control board through the positioning post B, which prevents the circuit board from being installed backwards or offset. At the same time, the retaining ring presses the control board, making the control board more secure and preventing the solder joints from falling off due to vibration.

[0033] The two ends of the rotating shaft 24 and the fixed sleeve 26 are rotatably connected by bearings A27 and B211, respectively. A concave ring 241 is also provided on the rotating shaft 24 outside bearings A27 and B211, and an open retaining ring 28 is provided inside the concave ring 241 to prevent axial displacement of the bearings. Both ends of the fixed sleeve 26 have stepped surfaces. Bearings A27 and B211 are embedded in the fixed sleeve 26 and abut against one stepped surface, while the other abut against the open retaining ring 28, ensuring that the bearings do not experience axial displacement and making the motor operation more stable.

[0034] The above structure uses a stepped surface and an open retaining ring for bidirectional locking bearings, which eliminates axial movement when the motor is running at high speed, so that the bearing has no axial displacement, reduces friction noise, and extends bearing life.

[0035] One end of the rotating shaft 24 is inserted and fixed in the center of the motor housing 21, and an axially extending rib 242 is provided on the side wall of the insertion point between the rotating shaft 24 and the motor housing 21. The rib is embedded in the slot of the motor housing to prevent the rotating shaft from slipping with the housing and to ensure 100% torque transmission.

[0036] like Figure 9 and Figure 10 As shown, a limiting notch 42 is provided at one end of the push rod sleeve 4, and a protrusion is provided on the first half shell 11 and / or the second half shell 12. Through the cooperation of the protrusion and the notch 42, the push rod sleeve 4 is limited in the length direction.

[0037] The nut 31 includes a guide block and a threaded post disposed on the guide block, and the push rod 32 is threadedly fastened to the threaded post. At least one side of the guide block has a guide groove 311, and the inner wall of the push rod sleeve 4 has a guide strip. The guide strip engages with the guide groove 311, allowing the guide block to slide along the length of the push rod sleeve 4. The engagement of the guide groove and the guide strip on the inner wall of the push rod sleeve forces the nut to move only linearly, preventing it from rotating with the lead screw. Simultaneously, the guide groove distributes radial force, reducing one-sided wear of the lead screw threads.

[0038] One end of the push rod sleeve 4 is also fixed with a push rod sleeve cover 41. One end of the push rod 32 is inserted into the push rod sleeve cover 41. The push rod sleeve cover provides support for the push rod, which helps the push rod to extend and retract smoothly. At the same time, the push rod sleeve cover prevents external impurities from entering the push rod sleeve. The end of the push rod 32 that extends out of the push rod sleeve 4 is also fixed with a push rod plug 321. The push rod plug has a connecting hole for easy connection of the push rod to other components.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An electric machine structure, characterized by The device includes a motor housing (21), a stator assembly (22), a magnetic ring (23), a rotating shaft (24), a control circuit board (25), and a fixing sleeve (26). One end of the fixing sleeve (26) is fixed to the first half-shell (11). The control circuit board (25) and the stator assembly (22) are sequentially fitted and fixed on the fixing sleeve (26). The rotating shaft (24) is rotatably disposed in the fixing sleeve (26), and both ends extend out of the fixing sleeve (26). The magnetic ring (23) is fixed on the inner wall of the motor housing (21) and fitted outside the stator assembly (22). One end of the rotating shaft (24) is fixed to the motor housing (21).

2. An electrical machine structure according to claim 1, characterised in that Multiple positioning posts A (261) are spaced apart on the outer wall of one end of the fixed sleeve (26). The first half shell (11) is provided with corresponding through holes. The positioning posts A (261) are inserted into the corresponding through holes. Connecting ears (29) are also provided between adjacent positioning posts A (261). The fixing bolt (112) passes through the first half shell (11) and is fastened to the connecting ears (29).

3. An electrical machine structure according to claim 2, characterised in that, One side of the connecting ear (29) is a threaded hole, and the other side is a positioning post B (291). The control circuit board (25) has a corresponding positioning hole (251). The fixing sleeve (26) is also fitted with a retaining ring (210). The retaining ring (210) abuts against the control circuit board (25), so that the positioning post B (291) is inserted into the positioning hole (251).

4. An electrical machine structure according to claim 1, characterised in that, The two ends of the rotating shaft (24) and the fixed sleeve (26) are rotatably connected by bearing A (27) and bearing B (211) respectively. A concave ring (241) is also provided on the outside of bearing A (27) and bearing B (211) on the rotating shaft (24). An open retaining ring (28) is provided inside the concave ring (241) to prevent the bearing from axially displacing.

5. An electrical machine structure according to claim 4, characterised in that, Both ends of the fixed sleeve (26) are provided with stepped surfaces. The bearings A (27) and B (211) are embedded in the fixed sleeve (26) and abut against one side of the stepped surface, and abut against the open retaining ring (28) on the other side.

6. The motor structure according to claim 1, characterized in that, One end of the rotating shaft (24) is inserted and fixed in the center of the motor housing (21), and an axially extending rib (242) is provided on the side wall of the insertion point between the rotating shaft (24) and the motor housing (21).

7. An electric linear actuator, comprising a actuator sleeve (4), a linear actuator (32), a lead screw assembly, a housing, and a motor (2), characterized in that: The motor (2) is as described in any one of claims 1 to 6. The lead screw assembly includes a lead screw (3) and a nut (31). The nut (31) is threadedly connected to the lead screw (3). The push rod (32) is fixed to the nut (31). The push rod sleeve (4) is sleeved on the push rod (32), and the push rod (32) extends from one end of the push rod sleeve (4). The housing is fixed to the other end of the push rod sleeve (4). The lead screw (3) is inserted into the housing. The motor (2) is fixed on the housing, and the motor shaft extends into the housing. The lead screw (3) is driven to rotate through gear meshing, thereby driving the push rod (32) on the lead screw (3) to perform telescopic movement.

8. The electric linear actuator according to claim 7, characterized in that, A retaining ring (111) is provided on one side of the housing. The motor (2) is located inside the retaining ring (111) and is fixed by a fixing bolt (112). The retaining ring (111) is also fitted with a buckle cover (13).

9. The motorized push rod of claim 7, wherein, The nut (31) includes a guide block and a threaded post on the guide block. At least one side of the guide block is provided with a guide groove (311). The inner wall of the push rod sleeve (4) is provided with a guide strip. The guide strip cooperates with the guide groove (311) so that the guide block slides along the length direction of the push rod sleeve (4).

10. The motorized push rod of claim 7, wherein, One end of the push rod sleeve (4) is also fixed with a push rod sleeve cover (41), and one end of the push rod (32) is inserted into the push rod sleeve cover (41).

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