Actuator and assembling method thereof

Abstract

The actuator comprises a shell, a power assembly and an output assembly, at least part of the power assembly is located in the shell, the power assembly comprises a stator part and a rotor part, the stator part comprises a stator core and a framework, the stator core is connected with the framework, and the framework is provided with an avoiding groove; in the direction from the framework to the stator core, part of the stator core is exposed out of the avoiding groove. When an external tool is used for assembling the shell and the stator core, the external tool can act on the stator core through the receding grooves, and damage to the framework is reduced. The invention further provides an assembling method of the actuator, the shell and the stator part comprising the stator core and the framework are provided, the framework is provided with the receding groove, the tool is provided, and the tool is inserted into the receding groove to push the stator core to be in interference fit with the inner wall of the shell. According to the invention, when the stator core and the shell are assembled, the tool can abut against the stator core through the receding groove, so that the damage to the skeleton in the assembling process can be reduced.

Description

Technical Field

[0001] The present application relates to the field of actuators, and in particular to a skeleton of an actuator. Background Art

[0002] The actuator includes a power assembly, which consists of a stator and a rotor. The rotor consists of a stator core and a frame. During actuator assembly, the frame is connected to the stator core, coils are wound around it, and then the stator core and frame are assembled into the actuator housing, creating an interference fit between the stator core and the housing. In related art, the frame is made of plastic. When the tooling is used to push the stator core and frame into the actuator housing, it can damage the frame, causing assembly failure. Summary of the Invention

[0003] The present application provides an actuator, comprising a housing, a power assembly, and an output assembly, wherein the power assembly is at least partially located within the housing, the output assembly is at least partially located within the housing, and the power assembly drives the output assembly;

[0004] The power assembly includes a stator part and a rotor part, the stator part includes a stator core and a frame, the stator core is connected to the frame, and the frame has an avoidance groove;

[0005] In a direction from the frame to the stator core, a portion of the stator core is exposed in the avoidance groove.

[0006] In the present application, the skeleton has an avoidance groove, and part of the stator core is exposed in the avoidance groove in the direction from the skeleton to the stator core, so that when the external tooling is assembling the shell and the stator core, it can act on the stator core through the avoidance groove, thereby reducing damage to the skeleton.

[0007] The present application also provides an actuator assembly method, providing a housing, a stator portion including a stator core and a frame, the frame being provided with an avoidance groove, and a tooling, which is inserted into the avoidance groove to push the stator core to achieve an interference fit with the inner wall of the housing.

[0008] In the present application, when the stator core and the housing are assembled, the tooling can push the stator core through the avoidance groove, thereby reducing damage to the frame during the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A perspective view of the actuator in this application;

[0010] Figure 2 is a cross-sectional view of the actuator in this application;

[0011] Figure 3 This is an exploded view of the housing and stator in this application;

[0012] Figure 4 This is an exploded view of the stator core and skeleton in this application;

[0013] Figure 5 A three-dimensional diagram of the skeleton in this application;

[0014] Figure 6 A top view of the skeleton in this application;

[0015] Figure 7 is an exploded view of the actuator in this application;

[0016] Figure 8 for Figure 2 Enlarged view of the middle circle A;

[0017] Figure 9 A three-dimensional diagram of the support base in this application;

[0018] Figure 10 A cross-sectional view of the support seat in this application;

[0019] Figure 11 This is an exploded view of the threaded sleeve and base in this application;

[0020] Figure 12 This is an exploded view of the threaded sleeve and the base in this application from another perspective. DETAILED DESCRIPTION

[0021] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0022] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] In the related technology, the actuator includes a stator part and a rotor part. The stator part forms a magnetic fit with the rotor part after power is applied. The stator part includes a stator core and a frame. The stator core serves as the supporting structure of the stator part. Coils need to be wound on the stator core and the frame to generate a magnetic field after power is applied. The frame is connected to the end of the stator core, and plays a blocking and insulating role between the end of the stator core and the coil.

[0024] During actuator assembly, the stator core and the frame are first connected. After the coils are wound, the stator core and frame are assembled together into the actuator housing. Tooling is used to push the stator core and frame into the housing, creating an interference fit between the stator core and the housing. This requires applying a certain amount of force to the stator core and frame, which acts on the frame. However, the frame is typically made of plastic, making it susceptible to damage during assembly. To prevent this, technicians typically design and develop materials to improve the strength of the frame, thereby reducing damage. However, this is less effective, and replacing high-strength materials also increases the production cost of the frame.

[0025] This application provides an actuator, such as Figures 1 to 6 As shown, its specific structure includes a shell 1, a power component 2 and an output component 3. The power component 2 is at least partially located in the shell 1, and the output component 3 is at least partially located in the shell 1. The power component 2 drives the output component 3; the power component 2 includes a stator part 201 and a rotor part 220, the stator part 201 includes a stator core 202 and a skeleton 203, the stator core 202 is connected to the skeleton 203, and the skeleton 203 has an avoidance groove 204, which can facilitate the assembly of the stator core 202 and the shell 1; in the direction from the skeleton 203 to the stator core 202, the avoidance groove 204 can expose part of the stator core 202.

[0026] The stator core 202 is also the main supporting structure of the stator part 201, and constitutes the general structure and shape of the stator part 201. During assembly, the partial assembly sequence is the same as the assembly sequence of the related art. First, the skeleton 203 is connected to the end of the stator core 202, and then the coil is wound onto the stator core 202 and the skeleton 203. Then, the stator core 202 and the skeleton 203 with the coil wound are assembled into the shell 1. During assembly, the tooling abuts against the end face of the stator core 202 through the avoidance groove 204, pushing the stator core 202 so that the stator core 202 and the skeleton 203 are assembled into the shell 1. Compared with the related art that uses tooling to push the skeleton 203, the present application achieves assembly by pushing the stator core 202, which can better protect the skeleton 203 from being damaged.

[0027] Compared with the improvement of the skeleton 203 material by R&D personnel, the setting of the avoidance groove 204 can reduce the material cost of the skeleton 203. The avoidance groove 204 leaves space for the tooling to abut the stator core 202, avoiding damage to the skeleton 203 by the tooling.

[0028] Among them, the skeleton 203 includes a frame 205 and a winding part 206, the frame 205 is ring-shaped, the frame 205 is connected to the winding part 206, and the avoidance groove 204 is located on the frame 205; along the axial direction of the frame 205, the avoidance groove 204 passes through the frame 205, and the avoidance groove 204 has a notch 207, and the notch 207 faces the inner wall of the shell 1.

[0029] The frame 205 constitutes the overall structural shape of the skeleton 203 and provides a connection point for the winding portion 206. The winding portion 206 is the connection point for winding the coil. When winding, the coil is wound around the winding portion 206 and the stator core 202. The overall strength of the skeleton 203 is mostly determined by the strength of the frame 205. The avoidance groove 204 is provided on the frame 205. On the one hand, it is convenient for external tooling to be assembled, and on the other hand, it also reduces the weakening of the overall strength of the skeleton 203. In addition, the notch 207 is facing the inner wall of the shell 1, that is, the notch 207 is located on the circumferential outer wall of the frame 205, which is not only convenient for processing, but also reduces the reduction in the strength of the frame 205. The frame 205 and the winding portion 206 can be an integral part.

[0030] In the related art, there is also a method of reducing the wall thickness of the frame 205, thereby increasing the distance between the frame 205 and the inner wall of the shell 1, thereby leaving a larger space for the tooling to abut the stator core 202. However, this will also cause the strength of the frame 205 to be greatly reduced, thereby reducing the strength of the skeleton 203, and easily causing damage to the skeleton 203.

[0031] More specifically, the circumferential inner wall of the frame 205 is connected to the winding portion 206. Along the circumferential direction of the frame 205, the winding portion 206 is evenly spaced and the avoidance grooves 204 are evenly spaced. In the circumferential direction of the frame 205, the avoidance grooves 204 are located close to the position where the winding portion 206 is connected to the frame 205.

[0032] The number of winding sections 206 can be adjusted based on the actual actuator requirements. Arranged along the circumference of the frame 205, the winding sections 206 ensure even spacing of the coils after winding, thereby improving the overall stability of the actuator. The connection between the winding sections 206 and the frame 205 provides greater strength than other locations on the frame 205. Therefore, positioning the avoidance slot 204 near the connection between the winding sections 206 and the frame 205 minimizes the impact on the strength of the frame 205.

[0033] like Figures 3 to 6 As shown, in the circumferential direction of the frame 205 , the skeleton 203 has a wire outlet groove 208 , which is located near the connection position between the winding portion 206 and the frame 205 ; in the radial direction of the frame 205 , the wire outlet groove 208 passes through the frame 205 .

[0034] The provision of the wire outlet slot 208 facilitates the coil to extend from the wire outlet slot 208 after winding, thereby regularizing the position of the coil and preventing the wire ends from becoming tangled and knotted after winding, thereby causing short circuits and the like. On the other hand, the provision of the wire outlet slot 208 also facilitates seeing the direction of the internal circuit of the actuator, making it easier to repair problems later. The wire outlet slot 208 is also provided on the frame 205. The wire outlet slot 208 radially penetrates the frame 205, making it easier for the coil to pass through the wire outlet slot 208. The number of wire outlet slots 208 is an integer multiple of the winding portion 206, to ensure that after the coil is wound onto the winding portion 206, there is a wire outlet slot 208 for the wire ends to extend at the corresponding position where the winding portion 206 is connected to the frame 205. Since the series-parallel relationship between each set of coils is uncertain after being wound onto the winding portion 206 and needs to be determined based on the actual design of the actuator, at least one wire outlet slot 208 is provided at the corresponding position where each winding portion 206 is connected to the frame 205, thereby ensuring that the skeleton 203 can be adapted to the requirements of different types of actuators, thereby expanding its universal applicability.

[0035] like Figures 3 to 6 As shown, the skeleton 203 includes a positioning member 209 connected to the frame 205 . The stator core 202 has a positioning groove 210 . The positioning member 209 is at least partially located in the positioning groove 210 . The positioning member 209 can abut against the wall constituting the positioning groove 210 .

[0036] Positioning member 209 can position the frame 203 when it is connected to the stator core 202. Positioning member 209 can abut against the wall of positioning slot 210. The positioning member 209 cooperates with the wall of positioning slot 210 to limit the circumferential rotation of the frame 203, thereby facilitating coil winding. Positioning member 209 and frame 205 can be integral.

[0037] More specifically, the frame 205 includes a first end wall 211 and a second end wall 212, and the positioning member 209 is connected to the second end wall 212; the winding portion 206 is closer to the second end wall 212 than the first end wall 211, and the winding portion 206 is in contact with the stator core 202; in the circumferential direction of the frame 205, the positioning members 209 are evenly spaced; the positioning members 209 are staggered with the avoidance groove 204.

[0038] The connection between the positioning member 209 and the second end wall 212 and the winding portion 206 closer to the second end wall 212 can make the skeleton 203 fit the stator core 202 more closely, so that the two can fit more closely when the coil is wound, and the shaking of the skeleton 203 and the stator core 202 when the coil is wound can also be reduced.

[0039] Since the positioning member 209 is at least partially located in the positioning groove 210, in the axial direction of the frame 205, the avoidance groove 204 and the positioning member 209 cannot be located on the same straight line. If the two are located on the same straight line, the tooling cannot abut against the stator core 202 when passing through the avoidance groove 204. Moreover, if the two are located on the same straight line, the setting of the avoidance groove 204 will also reduce the strength of the positioning member 209, thereby affecting the overall strength of the skeleton 203.

[0040] In one embodiment, the number of the winding parts 206 is 12, the number of the positioning members 209 and the number of the avoidance grooves 204 are both 6, and the positioning members 209 and the avoidance grooves 204 are evenly spaced along the circumferential direction of the frame 205 without affecting each other.

[0041] like Figure 6 As shown, the inner circumferential wall of the frame 205 includes a straight line segment 213 , and the winding portion 206 is connected to the straight line segment 213 ; the straight line segments 213 are connected end to end in sequence.

[0042] The circumferential outer wall of the frame 205 is circular and can be adapted to the shape of the inner wall of the stator core 202 and the housing 1, thereby facilitating assembly. The winding portion 206 is located in the area enclosed by the frame 205 and then winds the coil together with the stator core 202. The stability of the magnetic coordination between the stator portion 201 and the rotor portion 220 is also related to the uniformity and position of the coil winding. The setting of the straight line segment 213 can provide a reference surface for the coil winding when the coil is wound, and the coil fits the straight line segment 213 when winding. Compared with the circular circumferential inner wall in the related art, the number of coil windings will be greater, and the uniformity and regularity of the coil winding will also be better. When winding the coil, it can start from the end of the winding portion 206 close to the straight line segment 213 and wind towards the end away from the straight line segment 213.

[0043] The winding portion 206 includes an arcuate segment 214 and a flat segment 215 . The arcuate segment 214 is connected to the flat segment 215 , and the flat segment 215 is in contact with the stator core 202 .

[0044] In one embodiment, the cross-section of the winding portion 206 is semicircular. The provision of the flat section 215 allows the winding portion 206 to conform to the end surface of the stator core 202, thereby improving the fit between the stator core 202 and the frame 203. When winding the coil, the chance of shaking between the frame 203 and the stator core 202 is reduced, making the structure more stable. The provision of the curved section 214 allows for a smooth transition during winding of the coil, ensuring a closer fit between the winding portion 206 and the stator core 202.

[0045] If the winding portion 206 is composed only of the arc segment 214 or the flat segment 215, although the connection between the skeleton 203 and the stator core 202 and the winding of the coil can be achieved, the connection effect and the flatness and smoothness of the wire winding will be worse. Among them, if the cross-section of the winding portion 206 is circular, the winding portion 206 cannot be completely fitted when connected to the stator core 202, and then after the coil is wound, there will be a gap between the winding portion 206 and the stator core 202 and the coil, and the compactness of the structure is low. In addition, if the cross-section of the winding portion 206 is square, although the winding portion 206 can fit between the stator core 202, there will be a gap between the winding portion 206 and the coil, which will also reduce the compactness of the structure after the coil is wound.

[0046] The housing 1 has a limiting groove 101 , and the stator core 202 includes a protrusion 216 . The protrusion 216 is at least partially located in the limiting groove 101 , and the protrusion 216 is limitedly engaged with a wall constituting the limiting groove 101 .

[0047] The stator core 202 and the inner wall of the housing 1 form an interference fit. The provision of the limiting groove 101 and the protrusion 216 can further reduce the possibility of the stator portion 201 rotating. The long-term magnetic engagement between the stator portion 201 and the rotor portion 220 may cause the interference fit between the stator portion 201 and the inner wall of the housing 1 to loosen, but the coordination of the limiting groove 101 and the protrusion 216 can reduce the occurrence of such a situation. In addition, if the limiting groove 101 and the protrusion 216 do not cooperate, in order to prevent the stator portion 201 from rotating, it is necessary to increase the interference fit between the stator portion 201 and the inner wall of the housing 1. A high interference fit may cause deformation of the stator portion 201 and the housing 1, thereby producing adverse effects. The provision of the limiting groove 101 and the protrusion 216 can reduce the interference fit between the stator core 202 and the inner wall of the housing 1, thereby reducing the structural deformation caused by the interference fit.

[0048] In addition, the present application also provides an assembly method for an actuator, providing a shell 1, a stator core 202 and a skeleton 203, the skeleton 203 is provided with an avoidance groove 204, the skeleton 203 is connected to the stator core 202, and the coil is wound around the skeleton 203 and the stator core 202, and a tool is provided, and the tool is inserted into the avoidance groove 204 to push the stator core 202 and the inner wall of the shell 1 to have an interference fit.

[0049] The tooling includes a pin. When the stator core 202 is pushed into the housing 1 and interference fits with the inner wall of the housing 1 , the pin can be inserted into the avoidance groove 204 , and then the stator core 202 can be directly pushed into the housing 1 .

[0050] In the related art, an actuator includes a housing, a support base, and an output assembly. The support base is located within the housing, and the output assembly consists of a threaded sleeve and a screw. The support base is used to support the threaded sleeve in the output assembly. The support base and the housing have an interference fit, and the threaded sleeve is driven to rotate during the operation of the actuator. After long-term operation, the support base and the housing will become loose, especially in the circumferential direction of the actuator. The two are more likely to loosen and rotate relative to each other, thereby reducing the support effect of the support base. (For ease of understanding and to distinguish them from the technical features in this application, the technical features described in the related art are not numbered.)

[0051] In another embodiment, Figures 7 to 10 As shown, the present application provides an actuator, whose specific structure includes a shell 1, a power assembly 2 and an output assembly 3, the power assembly 2 is at least partially located in the shell 1, and the output assembly 3 is at least partially located in the shell 1; the actuator includes a support seat 4, the support seat 4 is at least partially located in the shell 1, the support seat 4 supports the output assembly 3, the actuator includes a limiting structure, the limiting structure includes a limiting portion 5 and a matching groove 6; one of the limiting portion 5 and the matching groove 6 is located in the support seat 4, and the other is located in the shell 1; the limiting portion 5 is limited and matched with the wall constituting the matching groove 6.

[0052] Part of the function of the support seat 4 is the same as that in the related art, which is to support the output component 3. The limiting cooperation between the limiting portion 5 and the matching groove 6 can reduce the relative rotation of the support seat 4 in the circumferential direction of the actuator during operation or under the influence of external movement collision and other factors. At the same time, it also has a limiting effect on the movement of the support seat 4 in the axial direction of the actuator, so that the position of the support seat 4 can be relatively fixed, thereby improving the supporting effect of the support seat 4.

[0053] When the matching groove 6 is located in one of the support seat 4 or the shell 1, the limiting portion 5 can be fixedly connected to the other one, thereby forming a relative fixation and limitation between the support seat 4 and the shell 1 through the limitation between the limiting portion 5 and the wall of the matching groove 6. When the matching groove 6 is located on the support seat 4, the limiting portion 5 is fixedly mechanically connected to the shell 1 or is an integral part. More specifically, the matching groove 6 is located on the circumferential side wall of the support seat 4, and the limiting portion 5 is fixedly mechanically connected to the inner wall of the shell 1 or is an integral part. When the matching groove 6 is located on the shell 1, the limiting portion 5 is fixedly mechanically connected to the support seat 4 or is an integral part. More specifically, the matching groove 6 is located on the wall of the shell 1, and the limiting portion 5 is fixedly mechanically connected to the circumferential side wall of the support seat 4 or is an integral part.

[0054] In one embodiment, Figure 7As shown, the mating groove 6 is located in the shell 1, the shell 1 is cylindrical, the support seat 4 is interference fit with the inner wall of the shell 1, and in the radial direction of the shell 1, the mating groove 6 passes through the wall of the shell 1; the limiting portion 5 is connected to the circumferential side wall of the support seat 4, and the limiting portion 5 and the support seat 4 are an integrated part.

[0055] The interference fit between the support seat 4 and the shell 1 is smaller than the interference fit in the related art. In the related art, the limiting fit of the support seat and the shell is achieved by the interference fit between the two. In order to ensure the limiting fit between the two, the interference fit is relatively large, but this will cause the support seat 4 or the shell 1 to be deformed or dislocated during interference assembly, causing problems in the positioning of the support seat 4, and causing the output component 3 supported by the support seat 4 to deviate from the center line of the actuator shaft.

[0056] In the present application, the limited fit between the support seat 4 and the housing 1 can be achieved through the limited fit between the limiting portion 5 and the matching groove 6, so the interference fit between the support seat 4 and the housing 1 can be relatively small. The wall of the matching groove 6 can limit the limiting portion 5 in both the axial direction and the circumferential direction, thereby making the position of the support seat 4 relatively fixed. At the same time, the matching groove 6 can also be used to position the support seat 4 during installation.

[0057] During the installation process, when the support seat 4 is sent into the shell 1 for assembly, the limiting portion 5 is aligned with the position of the matching groove 6 so that the limiting portion 5 can be snapped into the matching groove 6 to complete the positioning of the support seat 4. In the related art, the positioning of the support seat still needs to rely on external tooling to make the position of the support seat relatively accurate after being installed in the shell, which is relatively troublesome and the positioning effect is also average. In the present application, the relative position of the support seat 4 is controlled by controlling the position of the matching groove 6, which is very convenient. Among them, the limiting portion 5 and the wall constituting the matching groove 6 can also be interference fit, thereby further improving the limiting effect of the support seat 4.

[0058] More specifically, Figure 7 and Figure 10 As shown, the support seat 4 includes a first side wall 401 and a second side wall 402. In the axial direction of the support seat 4, the first side wall 401 and the second side wall 402 are respectively located on opposite sides of the limiting portion 5; the first side wall 401 is interference fit with the inner wall of the shell 1; the actuator includes a first end cover 7, the first end cover 7 is connected to the end of the shell 1, the second side wall 402 is at least partially located in the first end cover 7, the first end cover 7 includes a step portion 701, and the second side wall 402 can abut against the step portion 701.

[0059] The interference fit between the support seat 4 and the shell 1 is mostly achieved through the interference fit between the first side wall 401 and the inner wall of the shell 1, and the second side wall 402 can be used to abut against the step portion 701 of the first end cover 7, so that the position of the first end cover 7 can also be positioned, so that the concentricity of the axial center line of the first end cover 7, the shell 1 and the output component 3 is higher.

[0060] The shell 1 has an end wall 103. In the axial direction of the shell 1, the matching groove 6 is recessed from the end wall 103 in the direction away from the first end cover 7; the matching groove 6 is recessed from the end wall 103 in the direction away from the first end cover 7, which makes the installation of the support seat 4 more convenient. During installation, the support seat 4 also enters the shell 1 from the end of the end wall 103. When the limiting portion 5 abuts against the bottom end of the matching groove 6 and can no longer move further into the shell 1, the assembly is completed, and the positioning of the support seat 4 is also completed.

[0061] In one embodiment, in the axial direction of the shell 1, the length of the depression of the matching groove 6 is equal to the length of the limiting portion 5, the first end cover 7 abuts against the end wall 103, and the first end cover 7 abuts against the limiting portion 5; at this time, the first end cover 7 abuts against the end wall 103 and the limiting portion 5 at the same time, and the first end cover 7 can limit the limiting portion 5 in the axial direction. Bolt connection points are provided on the outer wall of the first end cover 7 and the shell 1, so that the two are fastened together by bolts.

[0062] In another embodiment, in the axial direction of the housing 1, the length of the limiting portion 5 is greater than the length of the recess of the matching groove 6, and the first end cover 7 abuts against the limiting portion 5. Similarly, the first end cover 7 and the outer wall of the housing 1 are also provided with bolt connection points, which are fastened by bolts. The first end cover 7 abuts against the limiting portion 5, which can also limit the limiting portion 5 in the axial direction.

[0063] More specifically, four limiting portions 5 and four matching grooves 6 are provided. In the circumferential direction of the housing 1 , the limiting portions 5 are evenly spaced and the matching grooves 6 are evenly spaced.

[0064] The uniform arrangement of the limiting portions 5 and the matching grooves 6 makes the overall mass distribution of the actuator more uniform, thereby improving the stability of the actuator during operation.

[0065] like Figure 10 As shown, the support seat 4 has a first cavity 403, the actuator includes a first bearing 8, the first bearing 8 is at least partially located in the first cavity 403, the outer ring of the first bearing 8 is interference fit with the wall constituting the first cavity 403, the output component 3 includes a threaded sleeve 301 and a screw rod 302, the threaded sleeve 301 and the screw rod 302 are threadedly matched, and the inner ring of the first bearing 8 is connected to the threaded sleeve 301.

[0066] The support seat 4 has a second cavity 404 , the actuator includes a retaining spring 9 , the retaining spring 9 is at least partially located in the second cavity 404 , the first cavity 403 is communicated with the second cavity 404 , and the retaining spring 9 abuts against the outer ring of the first bearing 8 .

[0067] The support base 4 includes a third cavity 405 , which is communicated with the second cavity 404 , and a portion of the threaded sleeve 301 is located in the third cavity 405 .

[0068] The first cavity 403, the second cavity 404, and the third cavity 405 all extend through the support base 4 in the axial direction, allowing the threaded sleeve 301 to be inserted into the support base 4. The first cavity 403 provides space for the installation of the first bearing 8, and the second cavity 404 provides space for the connection of the retaining spring 9. The retaining spring 9 abuts against the outer ring of the first bearing 9 to limit the position of the first bearing 8. The third cavity 405 provides space for the end of the threaded sleeve 301. On the one hand, this allows the threaded sleeve 301 to be separated from other components by a certain distance, and on the other hand, it also allows for tolerance of the threaded sleeve 301. If the threaded sleeve 301 is larger than the standard design size, the longer portion can be placed in the third cavity 405 without interfering with other components.

[0069] like Figure 2 As shown, the actuator includes a second bearing 10, the outer ring of the second bearing 10 is interference fit with the inner wall of the housing 1, the inner ring of the second bearing 10 is connected to the threaded sleeve 301, and the first bearing 8 and the second bearing 10 are respectively located at both ends of the threaded sleeve 301.

[0070] The actuator includes a second end cover 11, which is connected to the housing 1, and the first end cover 7 and the second end cover 11 are respectively located at both ends of the housing 1; the second end cover 11 includes an abutment portion 1101, which is at least partially located in the housing 1, and the abutment portion 1101 abuts against the outer ring of the second bearing 10.

[0071] The second bearing 10 and the first bearing 8 are located at either end of the threaded sleeve 301, providing stable support for the rotation of the threaded sleeve 301. The second end cap 11 and the first end cap 7 are also located at either end of the housing 1, protecting the internal components of the actuator. The abutment portion 1101 of the second end cap 11 also abuts the outer ring of the second bearing 10, thereby limiting the position of the second bearing 10 and preventing it from moving.

[0072] In yet another embodiment, an actuator is provided, such as Figure 1 、 2 , 11 and Figure 12As shown, its specific structure includes a shell 1, an output component 3 and a sensing device 20, and the output component 3 is at least partially located in the shell 1; the output component 3 includes a threaded sleeve 301 and a screw rod 302, and the threaded sleeve 301 and the screw rod 302 are threaded together. The sensing device 20 includes a base 2001 and a sensing component 2002, and the sensing component 2002 is at least partially connected to the base 2001, and the base 2001 is welded to the threaded sleeve 301.

[0073] In related art, the base is assembled to one end of the threaded sleeve 301 through an interference fit, thereby achieving relative fixation between the base and the threaded sleeve. This allows the sensing component 2002, when attached to the base, to detect the operating status of the threaded sleeve as it rotates. The sensing component is typically an encoder assembly, including an encoder magnetic ring and an electronic control board that receives and transmits electromagnetic signals. However, during actual actuator operation, factors such as the rotation of the threaded sleeve itself and vibrations during overall actuator operation can cause the threaded sleeve and base to loosen, resulting in inaccurate sensing results and even affecting actuator operation.

[0074] To address the aforementioned issue of the threaded sleeve and base becoming loose, those skilled in the art typically increase the interference fit between the threaded sleeve and base. However, this can increase the deformation of the sleeve or base during the interference fit, causing structural distortion or misalignment, leading to inaccurate test results. Later designs have also employed bolt holes to secure the two, but these have been less than ideal.

[0075] During their research and development, the technical personnel of this application developed the solution of this application. In this application, the base 2001 is welded to the threaded sleeve 301 to achieve a fixed connection between the two. Compared with the interference fit or bolt connection methods in the related art, the welding method makes the connection between the two more secure and improves the integrity, preventing them from loosening easily. At the same time, the welding method also reduces the possibility of deformation and misalignment between the two.

[0076] More specifically, the base 2001 includes a protrusion 2003 , the threaded sleeve 301 has a docking groove 303 , the protrusion 2003 is at least partially located in the docking groove 303 , and the protrusion 2003 contacts a wall constituting the docking groove 303 .

[0077] The threaded sleeve 301 includes a docking surface 304, and in the axial direction of the threaded sleeve 301, the docking groove 303 is recessed from the docking surface 304 toward the direction away from the base 2001; the base 2001 includes a connecting surface 2004, and in the axial direction of the threaded sleeve 301, the protrusion 2003 extends from the connecting surface 2004 toward the direction close to the threaded sleeve 301; the docking surface 304 and the connecting surface 2004 can contact each other.

[0078] The overall structure of the base 2001 is roughly cylindrical, and its diameter is roughly the same as that of the threaded sleeve 301. The setting of the protrusion 2003 and the docking groove 303 makes the positioning between the threaded sleeve 301 and the base 2001 more convenient and quick, and also facilitates the welding of the two after positioning, which facilitates assembly.

[0079] The docking groove 303 is recessed from the docking surface 304 in the direction away from the base 2001, and is also recessed from the circumferential outer wall of the threaded sleeve 301 in the direction of the center line of the axis. The docking groove 303 forms a gap between the circumferential outer wall of the threaded sleeve 301 and the docking surface 304, thereby facilitating the protrusion 2003 to enter the docking groove 303 for positioning.

[0080] In one embodiment, in the axial direction of the threaded sleeve 301 , the length of the protrusion 2003 is the same as the depth of the docking groove 303 . At this time, the protrusion 2003 contacts the wall of the docking groove 303 , and the docking surface 304 and the connecting surface 2004 can also contact.

[0081] The base 2001 has a mounting cavity 2005 , which is located on a side of the base 2001 away from the threaded sleeve 301 . The induction component 2002 includes a magnetic ring 2006 , which is at least partially located in the mounting cavity 2005 and connected to a wall constituting the mounting cavity 2005 .

[0082] The sensing component 2002 includes an electric control board 2007, the actuator includes a first end cover 7, and the electric control board 2007 is connected to the inner wall of the first end cover 7; on the projection plane perpendicular to the axial direction of the threaded sleeve 301, the projection of the magnetic ring 2006 at least partially falls within the projection range of the electric control board 2007.

[0083] The setting of the installation cavity 2005 provides space for the installation of the magnetic ring 2006, so that the magnetic ring 2006 can rotate synchronously with the threaded sleeve 301. The magnetic force generated by the magnetic ring 2006 can be converted into an electrical signal through the components in the electronic control board 2007 and transmitted out, thereby monitoring the operation status of the threaded sleeve 301 in real time.

[0084] In addition, since the base 2001 is connected to the threaded sleeve 301 by welding, the interference fit that can easily cause deformation and dislocation in the related art is avoided. Therefore, the positioning of the base 2001 can be made more accurate, thereby making the magnetic signal transmission between the magnetic ring 2006 and the electronic control board 2007 more precise after installation. In one embodiment, in the axial direction of the threaded sleeve 301, the axial centerline of the magnetic ring 2006 and the axial centerline of the magnetic force receiving element in the electronic control board 2007 are located on the same straight line, thereby making the magnetic force transmission between the two more accurate. The principle is the same as that of the encoder assembly in the related art and will not be described in detail here. The welding of the base 2001 and the threaded sleeve 301 also improves the concentricity of the corresponding components in the sensing assembly 2002.

[0085] Among them Figure 11 and 12 As shown, the base 2001 has an accommodating cavity 2008, the threaded sleeve 301 has a cylindrical cavity 305, the screw rod 302 is at least partially located in the cylindrical cavity 305, and the screw rod 302 is threadedly matched with the wall of the cylindrical cavity 305; the accommodating cavity 2008 and the cylindrical cavity 305 can be communicated, and in the axial direction of the threaded sleeve 301, the accommodating cavity 2008 is recessed from the connecting surface 2004 in the direction away from the screw rod 302, and the opening of the accommodating cavity 2008 faces the screw rod 302.

[0086] The setting of the accommodation cavity 2008 provides space margin for the screw rod 302 to move in the axial direction and the tolerance of the screw rod 302 itself during production. If the length of the screw rod 302 in the axial direction is longer than the standard size, the excess length can be placed in the accommodation cavity 2008 and will not interfere with the contact with the base 2001.

[0087] If the accommodation cavity 2008 is not provided, after the base 2001 is welded to the threaded sleeve 301, there is no space margin between the cylinder cavity 305 and the base 2001. At this time, if the amount of movement of the screw rod 302 is large or the tolerance of the screw rod 302 is large, the screw rod 302 and the base 2001 will collide and interfere, resulting in structural damage, and thus affecting the overall operation of the actuator.

[0088] like Figure 2 and Figure 8 As shown, the actuator includes a support seat 4 and a first bearing 8. The support seat 4 has a first cavity 403. The first bearing 8 is at least partially located in the first cavity 403. The outer ring of the first bearing 8 is connected to the wall constituting the first cavity 403. The inner ring of the first bearing 8 is connected to the threaded sleeve 301.

[0089] The support base 4 has a second cavity 404 and a third cavity 405 . Part of the base 2001 is located in the second cavity 404 , and part of the base 2001 is located in the third cavity 405 .

[0090] On the one hand, the support seat 4 provides a connection point for the first bearing 8, thereby supporting one end of the threaded sleeve 301. On the other hand, the second cavity 404 and the third cavity 405 provide space for the installation of the base 2001, thereby reducing the overall axial size of the actuator and making the overall structure of the actuator more compact.

[0091] The actuator includes a power assembly 2 , which includes a stator portion 201 and a rotor portion 220 . The stator portion 201 is connected to the inner wall of the housing 1 , and the rotor portion 220 is connected to the threaded sleeve 301 .

[0092] The rotor portion 220 includes at least one magnetic steel group, which is attached to the outer circumferential surface of the threaded sleeve 301 using a surface-mount connection. This connection directly affixes the magnetic steel group to the outer circumferential surface of the threaded sleeve 301, thereby reducing the overall radial size of the actuator. If, as in the related art, the magnetic steel group is first affixed to a bushing and then mounted on the threaded sleeve 301, the radial size of the actuator would increase, the assembly process would be more complex, and production efficiency would be reduced.

[0093] In one embodiment, the rotor portion 220 includes a first magnetic steel group 221, a second magnetic steel group 222 and a third magnetic steel group 223, and the first magnetic steel group 221, the second magnetic steel group 222 and the third magnetic steel group 223 are all connected to the circumferential outer wall of the threaded sleeve 301; in the circumferential direction of the threaded sleeve 301, the first magnetic steel group 221, the second magnetic steel group 222 and the third magnetic steel group 223 are arranged in staggered polarity.

[0094] The first magnetic steel group 221, the second magnetic steel group 222 and the third magnetic steel group 223 are all arranged in a surface-mounted and staggered manner, thereby reducing the radial size of the actuator while also reducing the torque fluctuation of the actuator, thereby improving the performance of the actuator.

[0095] The above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. The understanding of this specification should be based on technical personnel in the relevant technical field. For example, directional descriptions such as "front", "back", "left", "right", "up", and "down" are only used to describe the relationship between objects and are not substantive limitations. "Multiple" means at least two or more.

[0096] Although this specification has described the present application in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that they can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereto that do not depart from the spirit and scope of the present application should be included within the scope of the claims of the present application.

Claims

1. An actuator, characterized in that: The invention comprises a housing (1), a power assembly (2) and an output assembly (3), wherein the power assembly (2) is at least partially located in the housing (1), the output assembly (3) is at least partially located in the housing (1), and the power assembly (2) drives the output assembly (3); The power assembly (2) comprises a stator part (201) and a rotor part (220), the stator part (201) comprises a stator core (202) and a skeleton (203), the stator core (202) is connected to the skeleton (203), and the skeleton (203) has an avoidance groove (204); In the direction from the skeleton (203) to the stator core (202), a portion of the stator core (202) is exposed in the avoidance groove (204).

2. The actuator according to claim 1, characterized in that The skeleton (203) includes a frame (205) and a winding portion (206); the frame (205) is annular, the frame (205) is connected to the winding portion (206), and the avoidance groove (204) is located in the frame (205); The avoidance groove (204) passes through the frame (205) along the axial direction of the frame (205), and the avoidance groove (204) has a notch (207), and the notch (207) faces the inner wall of the housing (1).

3. The actuator according to claim 2, characterized in that The circumferential inner wall of the frame (205) is connected to the winding portion (206); along the circumferential direction of the frame (205), the winding portions (206) are evenly spaced and arranged; and the avoidance grooves (204) are evenly spaced. In the circumferential direction of the frame (205), the avoidance groove (204) is located close to the position where the winding portion (206) is connected to the frame (205).

4. The actuator according to claim 2 or 3, characterized in that In the circumferential direction of the frame (205), the skeleton (203) has a wire outlet groove (208), and the wire outlet groove (208) is located close to the position where the winding part (206) is connected to the frame (205); in the radial direction of the frame (205), the wire outlet groove (208) passes through the frame (205).

5. The actuator according to claim 4, characterized in that The skeleton (203) includes a positioning member (209), the positioning member (209) is connected to the frame (205), the stator core (202) has a positioning groove (210), the positioning member (209) is at least partially located in the positioning groove (210), and the positioning member (209) can abut against a wall constituting the positioning groove (210).

6. The actuator according to claim 5, characterized in that The frame (205) includes a first end wall (211) and a second end wall (212), and the positioning member (209) is connected to the second end wall (212); the winding portion (206) is closer to the second end wall (212) than the first end wall (211), and the winding portion (206) is in contact with the stator core (202); In the circumferential direction of the frame (205), the positioning members (209) are evenly spaced and arranged; the positioning members (209) and the avoidance grooves (204) are staggered.

7. The actuator according to claim 4, characterized in that The circumferential inner wall of the frame (205) includes a straight line segment (213), and the winding portion (206) is connected to the straight line segment (213); the straight line segments (213) are connected end to end in sequence.

8. The actuator according to claim 2 or 7, characterized in that: The winding portion (206) includes an arcuate segment (214) and a plane segment (215), the arcuate segment (214) is connected to the plane segment (215), and the plane segment (215) is in contact with the stator core (202).

9. The actuator according to claim 1 or 2, characterized in that: The housing (1) has a limiting groove (101), the stator core (202) includes a protrusion (216), the protrusion (216) is at least partially located in the limiting groove (101), and the protrusion (216) is limitedly matched with a wall constituting the limiting groove (101).

10. A method for assembling an actuator, characterized in that: A housing (1) and a stator portion (201) comprising a stator core (202) and a frame (203) are provided, wherein the frame (203) is provided with an avoidance groove (204); and a tool is provided, wherein the tool is inserted into the avoidance groove (204) to push the stator core (202) to achieve interference fit with the inner wall of the housing (1).

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