Actuator

Abstract

The invention provides an actuator which comprises a lead screw, a sleeve and a shell, at least part of the lead screw is installed in the sleeve, the sleeve is installed in the shell, the sleeve comprises a threaded inner wall, the lead screw comprises a connecting section and a traction section, the connecting section is in threaded connection with the threaded inner wall, the actuator further comprises a supporting piece, and the supporting piece is connected with the shell and comprises an installation hole part. The traction section penetrates through the mounting hole part, the mounting hole part comprises at least one first straight plane, the traction section comprises at least one second straight plane, and in the braking process of the lead screw, the first straight planes are attached to the second straight planes, so that the effect of hindering rotation of the lead screw is improved, and rotation stopping of the lead screw is facilitated.

Description

Technical Field

[0001] This application relates to the field of actuators, and particularly to an actuator. Background Art

[0002] Actuators include linear actuators. A linear actuator mainly consists of a motor push rod and a control mechanism. The motor rotates to drive the lead screw to move, converting the rotational motion of the motor into the linear motion of the lead screw. The rotation of the motor is controlled by a control system to achieve motion control.

[0003] Since the linear actuator mainly determines the movement distance to be pulled by the linear actuator by controlling the movement amount of the lead screw, when the lead screw moves to the target movement amount, it is necessary to stop the lead screw in time and fix the lead screw at the current position, thereby ensuring the movement distance required by the actuator. The linear actuator is also provided with a sliding support member that cooperates with the lead screw. The sliding support member mainly provides a supporting effect for the lead screw. When the sleeve stops rotating, ideally, the lead screw will stop moving immediately after the sleeve stops rotating. However, in related technologies, after the sleeve stops rotating, the lead screw itself may continue to move due to inertia or other reasons. In addition, at present, most lead screws use circular cylinders, and the mounting holes of the sliding support members that cooperate with the lead screw also use circular holes. In this way, during the braking process of the lead screw, the mounting holes of the sliding support members cannot play a role in helping the lead screw stop rotating. Summary of the Invention

[0004] The purpose of this application is to provide an actuator that can help the lead screw stop rotating.

[0005] This application provides an actuator, which includes a lead screw, a sleeve, and a housing. At least a part of the lead screw is installed in the sleeve, and the sleeve is installed in the housing. The sleeve includes a threaded inner wall. The lead screw includes a connection section and a traction section. The connection section is threadedly connected to the threaded inner wall. The actuator further includes a support member connected to the housing. The support member includes a mounting hole portion. The traction section passes through the mounting hole portion. The mounting hole portion includes at least one first straight plane, and the traction section includes at least one second straight plane. During the braking process of the lead screw, the first straight plane is in contact with the second straight plane.

[0006] The actuator of this application includes a support member, a sleeve, and a lead screw. The support member includes a mounting hole portion. The lead screw includes a connection section and a traction section. The traction section passes through the mounting hole portion. The mounting hole portion includes at least one first straight plane, and the traction section includes at least one second straight plane. During the braking process of the lead screw, the first straight plane is in contact with the second straight plane, increasing the effect of hindering the rotation of the lead screw and helping the lead screw stop rotating. Description of the Drawings

[0007] Figure 1 is a perspective view of an actuator according to an embodiment of this application;

[0008] Figure 2 Cross-sectional view of an actuator according to an embodiment of the present application;

[0009] Figure 3 Assembly drawing of a support member and a lead screw according to an embodiment of the present application;

[0010] Figure 4 Stereogram of a support member according to an embodiment of the present application;

[0011] Figure 5 Cross-sectional view of the assembly of a support member and a lead screw according to an embodiment of the present application;

[0012] Figure 6 Cross-sectional view of the assembly of a support member and a lead screw according to an embodiment of the present application;

[0013] Figure 7 Stereogram of a support member according to another embodiment of the present application;

[0014] Figure 8 Cross-sectional view of the assembly of a support member and a lead screw according to another embodiment of the present application;

[0015] Figure 9 Assembly drawing of a support member and a lead screw according to yet another embodiment of the present application;

[0016] Figure 10 Assembly drawing of a support member and a lead screw according to still another embodiment of the present application;

[0017] Figure 11 Stereogram of an end cap according to an embodiment of the present application;

[0018] Figure 12 Schematic diagram of an end cap according to an embodiment of the present application at an angle;

[0019] Figure 13 Cross-sectional view of an end cap according to an embodiment of the present application. Detailed Description of the Invention

[0020] In order to better understand the technical solution of the present invention, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0021] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0022] As Figures 1 - 13As shown, an actuator includes a lead screw 2, a sleeve 3, and a housing. The lead screw 2 is at least partially installed in the sleeve 3, and the sleeve 3 is installed in the housing. The sleeve 3 includes a threaded inner wall 31. The lead screw 2 includes a connecting section 21 and a traction section 22. The connecting section 21 is threadedly connected to the threaded inner wall 31. The actuator further includes a support member 1, which is connected to the housing. The support member 1 includes a mounting hole portion 111. The traction section 22 passes through the mounting hole portion 111. The mounting hole portion 111 includes at least one first straight plane 113, and the traction section 22 includes at least one second straight plane 222. During the braking process of the lead screw 2, the first straight plane 113 is in contact with the second straight plane 222.

[0023] The connecting section 21 of the lead screw 2 is threadedly connected to the threaded inner wall 31 of the sleeve 3. When the sleeve 3 rotates, the sleeve 3 drives the connecting section 21 of the lead screw 2 to rotate, enabling the traction section 22 of the lead screw 2 to perform a linear motion. The actuator further includes a support member 1, which is connected to the housing. The traction section 22 of the lead screw 2 is arranged to pass through the mounting hole portion 111. The mounting hole portion 111 includes at least one first straight plane 113, and the traction section 22 includes at least one second straight plane 222. During the braking process of the lead screw 2, the first straight plane 113 is in contact with the second straight plane 222. Such an arrangement increases the effect of hindering the rotation of the lead screw 2 and helps the lead screw to stop rotating.

[0024] Among them, the traction section 22 can be connected to the connecting section 21, or the traction section 22 is not connected to the connecting section 21. That is to say, there is another implementation manner. The lead screw 2 includes a transition section (not shown) located between the traction section 22 and the connecting section 21. Since at least part of the traction section 22 is located in the mounting hole portion 111 of the support member 1, it is only necessary to ensure that the part of the traction section 22 located in the mounting hole portion 111 includes at least one first straight plane 113. The transition section (not shown) can be of any shape.

[0025] Such as Figure 2 and Figure 3As shown, a second straight plane 222 is provided on the outer periphery of the traction section 22. The support member 1 includes an inner wall 11 and an outer wall 12. The mounting hole portion 111 is provided on the inner wall 11. The mounting hole portion 111 includes four first straight planes 113, and the first straight planes 113 are arranged in pairs opposite to each other. The four first straight planes form two opposite groups, and the first straight planes 113 in each group are arranged in parallel. The four first straight planes 113 enclose a square. The traction section 222 of the lead screw 2 passes through the mounting hole portion 111, and the second straight plane 222 can be attached to the first straight plane 113. The arrangement of the four first straight planes 113 being opposite to each other in pairs and enclosing a square provides a limiting space for the second straight plane 222 passing through the mounting hole portion 111. During the braking process of the lead screw 2, the second straight plane 222 can be attached to any first straight plane 113 to help stop the rotation of the lead screw 2. In this application, the outer peripheral contour of the traction section 222 of the lead screw 2 is square. In this application, in the projection plane perpendicular to the axis of the lead screw 2, both the first straight plane 113 and the second straight plane are straight lines.

[0026] The support member 1 includes an avoidance portion 112. The avoidance portion 112 is provided on the inner wall 11. The avoidance portion 112 connects adjacent first straight planes 113, and the avoidance portion 112 extends from the inner wall 11 towards the outer wall. In this application, the avoidance portion 112 is located at the corner of the mounting hole portion 111 and extends towards the outer wall 12. Since the traction section 22 of the lead screw 2 is set to be square, if the mounting hole portion 111 is only set to be square to match the shape of the traction section 22, then the square traction section 222 reciprocates in the square mounting hole portion 111, and it is easy to cause serious wear at the corners of the mounting hole portion 111. In order to reduce the serious wear at the corners of the mounting hole portion 111 in this application, an avoidance portion 112 is provided on the mounting hole portion 111, and the avoidance portion 112 is located at the corner of the mounting hole portion 111. Among them, the avoidance portion 112 can be provided at the edge of the mounting hole portion 111 or at the four corners of the mounting hole portion 111. When the avoidance portion 112 is provided at the edge of the mounting hole portion 111, as Figure 9 shown, during the rotation of the lead screw 2, the avoidance portion 112 located at the edge of the mounting hole portion 111 can reduce the interference probability between the traction section 22 of the lead screw 2 and the edge of the mounting hole portion 111. When the avoidance portion 112 is provided at the corner of the mounting hole portion 111, the avoidance portion 112 can be provided at the diagonal of the mounting hole portion 111, that is, the avoidance portion 112 is provided at the diagonal of the mounting hole portion 111, as Figure 10 shown, the avoidance portion 112 can also be provided at the four corners of the mounting hole portion 111, as Figure 5 and Figure 8As shown, in this way, during the rotation of the lead screw 2, the avoidance portions 112 at the four corners of the mounting hole portion 111 or the avoidance portions 112 at the diagonals of the mounting hole portion 111 can reduce the interference probability between the traction section 22 of the lead screw 2 and the corners of the mounting hole portion 111, thereby reducing the wear of the edges and corners of the mounting hole portion 111.

[0027] As Figure 3 and Figure 4 shown, the avoidance portion 112 includes a first extension section 1121, a second extension section 1122, and a third extension section 1123. The second extension section 1122 connects the first extension section 1121 and the third extension section 1123. The first extension section 1121 and the third extension section 1123 respectively extend from the inner wall 11 towards the outer wall 12, and the first extension section 1121 and the third extension section 1123 are respectively connected to the second extension section 1122 and the connecting edge 113. In this embodiment, the first extension section 1121 and the third extension section 1123 are oppositely arranged. The second extension section 1122 connects the first extension section 1121 and the third extension section 1123. The first extension section 1121 and the third extension section 1123 are connected to the connecting edge 113 of the mounting hole portion 111, realizing the connection between the avoidance portion 112 and the connecting edge 113. Among them, the first extension section 1121, the second extension section 1122, and the third extension section 1123 can be straight line segments or curved line segments.

[0028] As Figure 3 , Figures 5 - 8 shown, the traction section 22 of the lead screw 2 includes a guide sliding portion 221. The guide sliding portion 221 is arc-shaped and is located at the corner of the traction section 22. The guide sliding portion 221 is connected to the adjacent second straight plane 222. The ratio range of the radius r of the guide sliding portion 221 to the maximum distance k between the first extension section 1121 and the third extension section 1123 is 2 - 1.6. The maximum distance k between the first extension section 1121 and the third extension section 1123 is the maximum distance between the first extension section 1121 and the third extension section 1123, and can also be considered as the maximum width of the second extension section 1122.

[0029] When the ratio of the radius r of the guiding and sliding part 221 to the maximum distance k is less than 1.6, the distance between the first extension section 1121 and the third extension section 1123 may be too large, and the width of the avoiding part 112 is too large, which will affect the size of the mounting hole part 111 of the support member 1. There may be a situation where the size of the mounting hole part 111 is too large. When the traction section 22 of the lead screw 2 rotates, it may reduce the contact probability between the traction section 22 of the lead screw 2 and the edge of the mounting hole part 111, ultimately affecting the anti-rotation effect of the support member 1 on the traction section 22 of the lead screw 2. In addition, when the ratio of the radius r of the guiding and sliding part 221 to the maximum distance k is less than 1.6, the radius r may be too small, and the outer peripheral contour of the traction section 22 of the lead screw 2 is more square, which will increase the friction between the traction section 22 and the mounting hole part 111 and affect the movement of the traction section 22 of the lead screw 2 in the mounting hole part 111. When the ratio of the radius r of the guiding and sliding part 221 to the maximum distance k is greater than 2, the distance between the first extension section 1121 and the third extension section 1123 may be too small, and the width of the avoiding part 113 is too small, which will affect the size of the mounting hole part 111 of the support member 1. There may be a situation where the size of the mounting hole part 111 is too small. When the traction section 22 of the lead screw 2 rotates, it may increase the contact probability between the traction section 22 of the lead screw 2 and the edge of the mounting hole part 111, excessively interfering with the movement of the traction section 22 in the mounting hole part 111, and ultimately affecting the movement of the traction section 22 of the lead screw 2 in the mounting hole part 111. Preferably, in this embodiment, the ratio of the radius r of the guiding and sliding part 221 to the maximum distance k between the first extension section 1121 and the third extension section 1123 is 1.8. Of course, the ratio of the radius r of the guiding and sliding part 221 to the maximum distance k can also be 1.7, 1.75, 1.85, 1.9, 1.95, etc.

[0030] As Figure 4 , Figure 5 , Figure 7 and Figure 8 shown, in the projection plane perpendicular to the axis of the lead screw 2, the ratio range of the maximum distance D1 from the axis of the lead screw 2 to the guiding and sliding part 221 to the maximum distance D2 from the center of the mounting hole 111 to the second extension section 1122 is 0.55 - 0.85. When the second extension section 1122 is linear, as Figure 7 , Figure 8 shown, the maximum distance D2 from the center of the mounting hole part 111 to the second extension section 1122 is the longest distance from the center of the mounting hole part 111 to the second extension section 11122. When the second extension section 1122 is arc-shaped, as Figure 5 shown, the maximum distance D2 from the center of the mounting hole part 111 to the second extension section 1122 is the distance from the center of the mounting hole part 111 to the farthest point of the second extension section 1122.

[0031] When the ratio of the maximum distance D1 to the maximum distance D2 is less than 0.55, the avoidance portion 112 extends too far towards the outer wall 12, that is to say, the extension length of the avoidance portion 112 on the inner wall 11 is too large, and the size of the mounting hole portion 111 may be too large. When the traction section 22 of the lead screw 2 rotates, the contact probability between the traction section 22 of the lead screw 2 and the edge of the mounting hole portion 111 may be reduced, ultimately affecting the anti-rotation effect of the support member 1 on the traction section 22 of the lead screw 2. When the ratio of the maximum distance D1 to the maximum distance D2 is greater than 0.85, the avoidance portion 112 extends too short towards the outer wall 12, that is to say, the extension length of the avoidance portion 112 on the inner wall 11 is too small, and the size of the mounting hole portion 111 may be too small. When the traction section 22 of the lead screw 2 rotates, the contact probability between the traction section 22 of the lead screw 2 and the edge of the mounting hole portion 111 may be increased, ultimately possibly affecting the rotation of the lead screw 2. Preferably, in the present embodiment, the ratio of the maximum distance D1 from the axis of the lead screw 2 to the guide sliding portion 221 to the maximum distance D2 from the center of the mounting hole 111 to the second extension section 1122 is 0.7. Of course, the ratio of the maximum distance D1 to the maximum distance D2 may also be 0.65, 0.58, 0.6, 0.75, 0.8, 0.83, etc.

[0032] As Figure 4 and Figure 6 shown, the second extension section 1122 is arc-shaped. In the projection plane perpendicular to the axis of the lead screw 2, the ratio range of the maximum distance D1 from the axis of the lead screw 2 to the guide sliding portion 221 to the distance D3 from the axis of the lead screw 2 to the center of the second extension section 1122 is 0.65 - 0.75. When the second extension section 1122 is arc-shaped, if the maximum distance D1 is less than 0.65 compared to the distance D3 from the axis of the lead screw 2 to the center of the second extension section 1122, the extension length of the avoidance portion 112 on the inner wall 11 is too large, which may cause the strength of the support member 1 to deteriorate, thereby affecting the support stability of the support member 1. If the maximum distance D1 is greater than 0.75 compared to the distance D3 from the axis of the lead screw 2 to the center of the second extension section 1122, the extension length of the avoidance portion 112 on the inner wall 11 is too small, and the size of the mounting hole portion 111 may be too small. When the traction section 22 of the lead screw 2 rotates, the contact probability between the traction section 22 of the lead screw 2 and the edge of the mounting hole 11 may be increased, ultimately possibly affecting the rotation of the lead screw 2.

[0033] As Figure 4As shown, the outer peripheral contour of the support member 1 is square. The housing includes an end cap 5 and a housing 4. The end cap 5 is mounted on the housing 4, and the support member 1 is mounted on the end cap 5. The end cap 5 further includes a through hole 53 which communicates with the mounting hole 111, and at least a part of the traction section 22 passes through the through hole 53. The outer peripheral contour of the support member 1 is set to be square, and the support member 1 is connected to the housing, which further restricts the mounting stability of the support member 1 and reduces the occurrence of the support member 1 moving when the lead screw 2 rotates. Specifically, the end cap 5 includes a first peripheral wall 51 and a second peripheral wall 52 arranged along the axial direction. The first peripheral wall 51 is connected to the second peripheral wall 52 and is arranged in a stepped manner. The second peripheral wall 52 is provided with a mounting groove 521 which is square, and the support member 1 is mounted in the mounting groove 521. The through hole 53 is provided on the second peripheral wall 52 and is located within the mounting groove 521. When the support member 1 is mounted in the mounting groove 521, the mounting hole portion 111 of the support member 1 communicates with the through hole 53, and the traction section 22 of the lead screw 2 sequentially passes through the mounting hole portion 111 of the support member 1 and the through hole 53 and extends out of the actuator.

[0034] The actuator further includes a front cover 6 and a pull ring 7. The front cover 6 is mounted on the end cap 5, and the pull ring 7 is mounted on the extending end of the traction section 22 of the lead screw 2. One end of the end cap 5 is fixedly connected to the housing 4, and the front cover 6 is mounted on the end of the end cap 5 away from the housing 4. Specifically, the front cover 6 is sleeved on the outside of the end cap 5. The actuator further includes a shaft seal 8 which is located between the front cover 6 and the end cap 5, and the shaft seal 8 is mounted within the first peripheral wall 51 of the end cap 5. The front cover 6 is further provided with a through hole 61 through which the traction section 22 of the lead screw 2 extends. The actuator further includes a fastener 10 and a rolling support member 20. The rolling support member 20 is located within the housing 4 and is sleeved on the outer periphery of the sleeve 3. The sleeve 3 is further provided with a limiting portion 32 protruding radially outward, and the limiting portion 32 abuts against the sleeve 3. The fastener 10 is sleeved on the outside of one end of the sleeve 3 close to the end cap 5. Specifically, the sleeve 3 includes an external thread end which is provided on the outside of one end of the sleeve 3 close to the end cap 5. The inner side of the fastener 10 is provided with an internal thread, and the fastener 10 is screwed onto the external thread end of the sleeve 3, and the fastener 10 is located on the side of the rolling support member 20 away from the limiting portion 32. The rolling support member 20 is provided to support the sleeve 3, and the limiting portion 32 of the sleeve 3 and the fastener 10 are provided to axially limit the sleeve 3 and reduce the possibility of the sleeve 3 moving axially.

[0035] The actuator further includes a driving mechanism 9, a sensing mechanism, and a control mechanism. The control mechanism determines the driving amount given by the driving mechanism 9 to the sleeve 3 and controls the operation of the driving mechanism 9. The driving mechanism 9 drives the sleeve 3 to rotate, and the sleeve 3 drives the lead screw 2 to perform reciprocating linear motion. Thus, the pull ring 7 can drive the object to be controlled to perform linear motion. During the motion, the sensing mechanism monitors the rotation of the sleeve 3 or the movement of the lead screw 2. When the sleeve 3 or the lead screw 2 reaches the required rotation amount or displacement amount, the control mechanism controls the driving mechanism 9 to stop working. It should be noted here that the lead screw 2 used in this application is a trapezoidal lead screw, which has a self-locking function and can keep the lead screw 2 fixed at the current position as much as possible when the lead screw 2 stops moving.

[0036] The above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. The understanding of this specification should be based on those skilled in the art of the relevant technical field. For example, the directional descriptions such as "front", "rear", "left", "right", "up", and "down" are only used to describe the relationship between objects and are not substantial limitations. "Multiple" means at least two or more.

[0037] Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the relevant technical field can still modify the present application or make equivalent substitutions. All technical solutions and their improvements that do not depart from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. An actuator, characterized in that, It includes a lead screw (2), a sleeve (3), and housings (4, 5). At least part of the lead screw (2) is installed in the sleeve (3), and the sleeve (3) is installed in the housings (4, 5). The sleeve (3) includes a threaded inner wall (31). The lead screw (2) includes a connecting section (21) and a traction section (22). The connecting section (21) is threadedly connected to the threaded inner wall (31). The actuator further includes a support member (1). The support member (1) is connected to the housings (4, 5). The support member includes a mounting hole portion (111). The traction section (22) passes through the mounting hole portion (111). The mounting hole portion (111) includes at least one first straight plane (113). The traction section (22) includes at least one second straight plane (222). During the braking process of the lead screw (2), the first straight plane (113) fits with the second straight plane (222).

2. The actuator according to claim 1, characterized in that, The second straight plane (222) is provided on the outer periphery of the traction section (22). The support member (1) includes an inner wall (11). The mounting hole portion (111) is provided on the inner wall (11). The mounting hole portion (111) includes four of the first straight planes (113), and the first straight planes (113) are arranged opposite to each other in pairs.

3. The actuator according to claim 2, characterized in that, The support member (1) includes an avoidance portion (112). The avoidance portion (112) is provided on the inner wall (11). The avoidance portion (112) connects adjacent first straight planes (113).

4. The actuator according to claim 3, wherein, The support member (1) includes an outer wall (12). The avoidance portion (112) extends from the inner wall (11) towards the outer wall (12).

5. The actuator according to claim 3, characterized in that, The avoidance portion (112) includes a first extension section (1121), a second extension section (1122), and a third extension section (1123). The second extension section (1122) connects the first extension section (1121) and the third extension section (1123).

6. The actuator according to claim 5, characterized in that The traction section (22) includes a guiding and sliding portion (221). The guiding and sliding portion (221) is arc-shaped. The guiding and sliding portion (221) connects adjacent second straight planes (222). The ratio range of the radius (r) of the guiding and sliding portion (221) to the farthest distance (k) between the first extension section (1121) and the third extension section (1123) is 2 - 1.

6.

7. The actuator according to claim 6, characterized in that, In the projection plane perpendicular to the axis of the lead screw (2), the ratio range of the farthest distance (D1) from the axis of the lead screw (2) to the guiding and sliding portion (221) to the farthest distance (D2) from the center of the mounting hole (111) to the second extension section (1122) is 0.55 - 0.

85.

8. The actuator according to claim 5, characterized in that, The second extension section (1122) is arc-shaped. In the projection plane perpendicular to the axis of the lead screw (2), the ratio range of the farthest distance (D1) from the axis of the lead screw (2) to the guiding and sliding portion (221) to the distance (D3) from the axis of the lead screw (2) to the center of the second extension section (1122) is 0.65 - 0.

75.

9. The actuator according to any one of claims 1-9, characterized in that, In the projection plane perpendicular to the axis of the lead screw (2), the first straight plane (113) and the second straight plane are straight lines.

10. The actuator according to any one of claims 1-9, characterized in that, The outer peripheral contour (1) of the support member is square. The housing includes an end cap (5) and a housing body (4). The end cap (5) is mounted on the housing body (4), and the support member (1) is mounted on the end cap (5).

Images