Miniature linear driver
By designing the bearing portion and setting a matching hole in the housing on the push rod of the micro linear drive, the problems of inaccurate guidance and susceptible to biasing forces in the prior art are solved, and more precise guidance and long-term stable performance are achieved.
Patent Information
- Application Number
- CN202421004525.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-05-10
AI Technical Summary
The nut push rod guide of existing micro linear drives is not accurate enough, and is easily affected by biasing forces, causing damage to the screw and other components. After long-term use, the friction between the screw and the nut push rod leads to a gap, affecting the guidance accuracy.
A micro linear driver is designed, the push rod has a bearing limit part, and a matching hole is provided in the housing. The push rod slides along the axial direction of the screw under the cooperation of the bearing limit part and the matching hole, ensuring accurate guidance and transmitting the force to the housing when it is subjected to a biasing force to avoid impact damage to the screw and other components.
It achieves more precise guidance, resists impact damage caused by external bias forces, reduces wear of threaded connections between the screw and the push rod, and ensures long-term accuracy of push rod guidance.
Smart Images
Figure CN222691515U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of motor drive technology, and in particular to a micro linear drive. Background Art
[0002] A micro linear drive is a device that converts the rotational motion of a motor into linear motion. It is widely used in the fields of automation and precision control.
[0003] Micro linear drives can be classified according to transmission mode and structural form, mainly into linear motor drives and worm gear drives.
[0004] Existing micro linear actuators are usually composed of motors, lead screws, nut push rods, encoders, controllers and sensors. The motor is responsible for achieving linear motion, the encoder provides high-precision position feedback signals, the controller is used to accurately control the motor, and the sensor monitors parameters such as the position and speed of the object.
[0005] In existing miniature linear actuators, the guidance of the nut push rod is generally achieved through a screw rod that is sleeved thereon and a hole in the housing through which the nut push rod extends. However, this structure easily leads to inaccurate guiding of the nut push rod, which can easily cause damage to the screw rod and other components connected to the screw rod when subjected to deflection force. Moreover, after long-term use, the friction between the screw rod and the nut push rod causes a gap to form between the two, further affecting the precise guiding of the nut push rod.
[0006] Therefore, the present application urgently needs a micro linear actuator with precise guidance and the ability to resist impact damage caused by external deflection force to solve the above-mentioned problems. Utility Model Content
[0007] The purpose of the present application is to provide a micro linear actuator with precise guidance and capable of resisting impact damage caused by external bias forces.
[0008] To achieve the above-mentioned purpose, an embodiment of the present application provides a miniature linear actuator, including a shell, a PCB board, a driving motor, a reducer, a screw and a push rod. The PCB board is electrically connected to the driving motor. The driving motor, the reducer, the screw and the push rod are all arranged in the shell and arranged in sequence along the axial direction of the screw. The output shaft of the driving motor is connected to the input end of the reducer, and one end of the screw is connected to the output end of the reducer. The push rod has a threaded hole that cooperates with the screw, and is sleeved on the screw through the threaded hole. The push rod has a bearing portion, and a matching hole that cooperates with the bearing portion is provided in the shell. The push rod slides along the axial direction of the screw under the matching restriction of the bearing portion and the matching hole. The driving motor drives the screw to rotate in its circumferential direction through the reducer, so as to link the push rod to telescopically slide along the axial direction of the screw.
[0009] In some embodiments of the present application, the limiting portion and the limiting hole are configured to limit the rotation of the push rod relative to the housing along the circumferential direction of the screw rod.
[0010] In some embodiments of the present application, the PCB board is disposed at one end of the driving motor away from the reducer, and the PCB board is arranged in an L shape, with one end of the PCB board extending along the axial direction of the screw rod and the other end of the PCB board extending along the radial direction of the screw rod.
[0011] In some embodiments of the present application, a support sleeve is provided on the front cover of the shell, and an end of the push rod away from the reducer is inserted into the support sleeve.
[0012] In some embodiments of the present application, a limiting portion protrudes inward from the shell and is used to limit the push rod from sliding along the axial direction of the screw rod. The limiting portion is located between the push rod and the reducer along the axial direction of the screw rod.
[0013] In some embodiments of the present application, the micro linear drive further includes a bearing, and the bearing is sleeved on an end of the lead screw away from the push rod.
[0014] In some embodiments of the present application, the micro linear drive further comprises a bearing seat clamped in the housing, the bearing seat is located between the limit portion and the reducer along the axial direction of the screw rod, and the bearing is arranged in the bearing seat.
[0015] In some embodiments of the present application, one side of the bearing seat along the axial direction of the screw rod abuts against the reducer, and the other side of the bearing seat along the axial direction of the screw rod abuts against the limiting portion.
[0016] In some embodiments of the present application, two bearings are arranged at intervals, and of the two bearings, one bearing is completely disposed in the bearing seat, and the other bearing is partially disposed in the bearing seat and partially disposed in the limiting portion.
[0017] In some embodiments of the present application, the bearing seat has a spacing positioning portion protruding inwardly, and the spacing positioning portion is arranged between the two bearings along the axial direction of the screw rod, and the two bearings are respectively connected to the spacing positioning portion.
[0018] In some embodiments of the present application, the bearing seat is clamped with the reducer, and the bearing seat is also fixedly connected to the limiting portion by bolts.
[0019] In some embodiments of the present application, the reducer is a planetary gear device, which includes a ring gear fixedly connected to the housing, a sun gear coaxially connected to the output shaft of the drive motor, planetary gears arranged between the ring gear and the sun gear, and a planetary gear carrier coaxially connected to the screw.
[0020] In some embodiments of the present application, the bearing seat is engaged with the ring gear.
[0021] Compared with the prior art, since the push rod in the micro linear actuator of the embodiment of the present application has a bearing portion, and a limiting hole cooperating with the bearing portion is provided in the shell, the push rod slides along the axial direction of the screw rod under the cooperation restriction of the bearing portion and the limiting hole, so that the push rod can achieve more precise guidance through the cooperation of the bearing portion and the limiting hole, and when the push rod is impacted by the deflection force, most of the force can be transmitted to the shell, avoiding the impact damage of the deflection force on the screw rod and other components connected to the screw rod (such as drive motor, reducer), and is beneficial to reducing the wear of the threaded connection between the screw rod and the push rod, further ensuring the long-term accuracy of the push rod guidance. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0023] Figure 1 A three-dimensional diagram of a micro linear actuator according to an embodiment of the present application.
[0024] Figure 2 for Figure 1 Front view of the micro linear actuator.
[0025] Figure 3 for Figure 2 The micro linear actuator is shown in a cross-sectional view taken along line AA. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0029] First of all, in the description of the embodiments of the present application, it needs to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0030] Secondly, the terms "first", "second", "third", etc. are only used to distinguish descriptions, without any distinction of order or importance, and cannot be understood as indicating or implying relative importance. The characteristics specified as "first" or "second" may explicitly or implicitly include one or more of such characteristics.
[0031] Furthermore, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted; the term "along a certain direction" does not mean that it must be absolutely parallel to the direction, but can be offset, that is, it only needs to have a component in the direction.
[0032] In addition, in the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, an electromagnetic connection, or even a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0033] In addition, the “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three cases that it can be “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”. The “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three cases that it can be “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.
[0034] See also Figure 1-3The micro linear actuator 1 of the embodiment of the present application includes a housing 10, a PCB board 20, a driving motor 30, a reducer 40, a screw 50 and a push rod 60. The PCB board 20 is electrically connected to the driving motor 30. The driving motor 30, the reducer 40, the screw 50 and the push rod 60 are all arranged in the housing 10 and arranged in sequence along the axial direction of the screw 50 (parallel to the direction indicated by the arrow X). The output shaft 30a of the driving motor 30 is connected to the input end of the reducer 40, one end of the screw 50 is connected to the output end of the reducer 40, and the push rod 60 is connected to the output end of the reducer 40. The rod 60 has a threaded hole 60a that matches with the screw rod 50, and is sleeved on the screw rod 50 through the threaded hole 60a. The push rod 60 has a bearing portion 60b, and a matching hole 10a that matches with the bearing portion 60b is provided in the housing 10. The push rod 60 slides along the axial direction of the screw rod 50 under the matching restriction of the bearing portion 60b and the matching hole 10a. The driving motor 30 drives the screw rod 50 to rotate along its circumferential direction (parallel to the direction indicated by the arrow Z) through the reducer 40, so as to link the push rod 60 to telescopically slide along the axial direction of the screw rod 50. More specifically, as follows:
[0035] like Figure 3 As shown, the limiting portion 60b and the limiting hole 10a are configured to limit the rotation of the push rod 60 relative to the housing 10 along the circumferential direction of the screw rod 60, so as to prevent the push rod 60 from rotating relative to the housing 10 along the circumferential direction of the screw rod 60, and ensure that the push rod 60 can only produce telescopic sliding along the axial direction of the screw rod 50 under the drive of the rotating screw rod 60, thereby avoiding unnecessary work and ensuring that the telescopic sliding distance of the push rod can be accurately controlled. For example, the limiting portion 60b is a quadrangular prism-like body, and correspondingly, the limiting hole 10a is a quadrangular prism-like hole matched therewith. Of course, according to actual conditions, the limiting portion 60b can also be a triangular prism-like body, a pentagonal prism-like body, a hexagonal prism-like body, etc., so it is not limited to this.
[0036] like Figure 3 As shown, the PCB board 20 is arranged at one end of the driving motor 30 away from the reducer 40, and the PCB board 20 is arranged in an L shape. One end of the PCB board 20 extends along the axial direction of the screw rod 50, and the other end of the PCB board 20 extends along the radial direction of the screw rod 50 (parallel to the direction indicated by the arrow Y), so as to facilitate the electrical connection between the PCB board 20 and the driving motor 30, and facilitate the connection between the PCB board 20 and the outside world, so that the PCB board 20 and the driving motor 30 are more reasonably compact, but not limited to this.
[0037] like Figure 3 As shown, a support sleeve 70 is provided on the front cover 11 of the shell 10, and the end of the push rod 60 away from the reducer 40 is inserted into the support sleeve 70 to provide sliding guidance and support for the end of the push rod 60 away from the reducer 40, ensuring smooth sliding and accurate sliding guidance, but not limited to this.
[0038] like Figure 3 As shown, the housing 10 protrudes inwardly with a limit portion 10b, which is located between the push rod 60 and the reducer 40 along the axial direction of the screw rod 50 to limit the push rod 60 from sliding along the axial direction of the screw rod 50 to avoid impact and damage to other internal components (such as the drive motor 30, the reducer 40, etc.).
[0039] like Figure 3 As shown, the micro linear actuator 1 further includes a bearing 80 , which is sleeved on the end of the lead screw 50 away from the push rod 60 to provide support and guidance for the end of the lead screw 50 away from the push rod 60 .
[0040] like Figure 3 As shown, the micro linear drive 1 also includes a bearing seat 90 clamped in the housing 10, and the bearing seat 90 is located between the limit portion 10b and the reducer 40 along the axial direction of the screw rod 50, and the bearing 80 is arranged in the bearing seat 90 to provide positioning and support for the bearing 80.
[0041] like Figure 3 As shown, the bearing seat 90 abuts against the reducer 40 on one side along the axial direction of the screw rod 50 , and the bearing seat 90 abuts against the limiting portion 10b on the other side along the axial direction of the screw rod 50 to ensure the positioning and stability of the bearing seat 90 .
[0042] like Figure 3 As shown, two bearings 80 are arranged at intervals. Among the two bearings 80, one bearing 80 is completely arranged in the bearing seat 90, and the other bearing 80 is partially arranged in the bearing seat 90 and partially arranged in the limiting portion 10b, so as to further improve the supporting stability and guiding accuracy of the screw push rod 50.
[0043] like Figure 3 As shown, the bearing seat 90 has an inwardly protruding spacing positioning portion, which is arranged between the two bearings 80 along the axial direction of the screw rod 50. The two bearings 80 are respectively abutted against the spacing positioning portion to provide accurate and reliable positioning for the two spaced-apart bearings 80.
[0044] like Figure 3 As shown, the bearing seat 90 is engaged with the reducer 40 , and the bearing seat 90 is also fixedly connected to the limiting portion 10 b by bolts, so as to facilitate the installation and positioning of the bearing seat 90 and the reducer 40 in the housing 10 .
[0045] like Figure 3As shown, the reducer 40 is a one-stage planetary gear device, which includes a ring gear 41 fixedly connected to the housing 10, a gear 42 coaxially connected to the output shaft 30a of the drive motor 30, a planetary gear 43 arranged between the ring gear and 42, and a planetary gear carrier 44 coaxially connected to the screw 50, so as to ensure that the reducer 40 has a compact structure and a large deceleration effect. Of course, according to actual conditions, in other embodiments, the reducer 40 can be a multi-stage planetary gear device such as a two-stage planetary gear device or a three-stage planetary gear device, or other conventional deceleration structures, so it is not limited to this.
[0046] like Figure 3 As shown, the bearing seat 90 is engaged with the ring gear 41 to achieve the engagement of the bearing seat 90 with the reducer 40 and ensure that the structure between the two is reasonable and compact. Figure 3 As shown, the bearing seat 90 is provided with an inner ring groove, and the bearing seat 90 has an outer ring portion corresponding to the inner ring groove, and the outer ring portion is clamped in the inner ring groove to achieve clamping of the two, but this is not limited to this.
[0047] It should be noted that in the drawings, the direction indicated by arrow X is parallel to the axial direction of the screw rod 50, the direction indicated by arrow Y is parallel to a radial direction of the screw rod 50, and the direction indicated by arrow Z is parallel to the circumferential direction of the screw rod 50, but this is not limited to it.
[0048] Compared with the prior art, in the micro linear actuator 1 of the embodiment of the present application, the push rod 60 has a bearing portion 60b, and a limiting hole 10a cooperating with the bearing portion 60b is provided in the housing 10. The push rod 60 slides along the axial direction of the screw rod 50 under the cooperation restriction of the bearing portion 60b and the limiting hole 10a, so that the push rod 60 can achieve more precise guidance through the cooperation of the bearing portion 60b and the limiting hole 10a, and when the push rod 60 is impacted by the deflection force, most of the force can be transmitted to the housing 10, avoiding the impact damage of the deflection force on the screw rod 50 and other components connected to the screw rod 50 (such as the drive motor 30, the reducer 40), and is conducive to reducing the wear of the threaded connection between the screw rod 50 and the push rod 60, further ensuring the long-term accuracy of the guidance of the push rod 60.
[0049] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it, but it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made within the scope recorded in this application still fall within the scope covered by this application.
Claims
1. A micro linear actuator, characterized in that: The invention comprises a shell, a PCB board, a driving motor, a reducer, a screw and a push rod, wherein the PCB board is electrically connected to the driving motor, the driving motor, the reducer, the screw and the push rod are all arranged in the shell and arranged in sequence along the axial direction of the screw, the output shaft of the driving motor is connected to the input end of the reducer, one end of the screw is connected to the output end of the reducer, the push rod has a threaded hole matched with the screw, and is sleeved on the screw through the threaded hole, the push rod has a bearing portion, a matching hole matched with the bearing portion is provided in the shell, the push rod slides along the axial direction of the screw under the matching restriction of the bearing portion and the matching hole, the driving motor drives the screw to rotate along its circumferential direction through the reducer, so as to link the push rod to telescopically slide along the axial direction of the screw.
2. The micro linear actuator according to claim 1, characterized in that: The limiting portion and the limiting hole are configured to limit the rotation of the push rod relative to the housing along the circumferential direction of the screw rod.
3. The micro linear actuator according to claim 1, characterized in that: The PCB board is arranged at one end of the driving motor away from the reducer. The PCB board is arranged in an L shape. One end of the PCB board extends along the axial direction of the screw rod, and the other end of the PCB board extends along the radial direction of the screw rod.
4. The micro linear actuator according to claim 1, characterized in that: A support sleeve is arranged on the front cover of the shell, and one end of the push rod away from the reducer is inserted into the support sleeve.
5. The micro linear actuator according to claim 1, characterized in that: A limiting portion protrudes inwardly from the housing and is used for limiting the push rod from sliding along the axial direction of the screw rod. The limiting portion is located between the push rod and the reducer along the axial direction of the screw rod.
6. The micro linear actuator according to claim 5, characterized in that: It also includes a bearing, which is sleeved on an end of the screw rod away from the push rod.
7. The micro linear actuator according to claim 6, characterized in that: It also includes a bearing seat clamped in the housing, the bearing seat is located between the limiting portion and the reducer along the axial direction of the screw rod, and the bearing is arranged in the bearing seat.
8. The micro linear actuator according to claim 7, characterized in that: The bearing seat abuts against the reducer at one side along the axial direction of the screw rod, and the bearing seat abuts against the limiting portion at the other side along the axial direction of the screw rod.
9. The micro linear actuator according to claim 7, characterized in that: Two bearings are arranged at intervals. Among the two bearings, one bearing is completely arranged in the bearing seat, and the other bearing is partially arranged in the bearing seat and partially arranged in the limiting portion.
10. The micro linear actuator according to claim 7, characterized in that: The bearing seat is clamped with the reducer, and the bearing seat is also fixedly connected with the limiting part by bolts.