Linear execution mechanism and linear module comprising same

Abstract

The linear executing mechanism comprises a lead screw, a nut seat and an injection molding nut, the lead screw is in threaded fit with the injection molding nut, a mounting hole is formed in the nut seat, the injection molding nut is integrally arranged in the mounting hole in an injection molding mode, and the lead screw is in threaded fit with the injection molding nut. A plurality of limiting grooves extending in the circumferential direction and the axial direction are formed in the inner surface of the mounting hole, and limiting ribs are formed in the limiting grooves of the injection molding nut. According to the utility model, the nut is injection-molded in the nut seat, so that the injection-molded nut is completely positioned in the nut seat and does not occupy the movement stroke of the screw rod, and the injection-molded nut is limited and resists torsion by processing the limiting groove in the mounting hole of the nut seat, so that the injection-molded nut is prevented from being separated from the nut seat; therefore, the overall motion precision of the linear module is improved, and miniaturization design of the linear module is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of linear module design technology, and in particular to a linear actuator and a linear module containing the same. Background Technology

[0002] Motor modules have become a popular choice for customers dealing with linear and curvilinear motion, widely used across various industries due to their high stability and precision. However, with the continuous development of the industry, customers have increasingly higher requirements for equipment operating costs and operational accuracy, necessitating continuous improvement and optimization to address emerging issues.

[0003] The linear module with the lead screw as the main moving part includes a nut that is threaded with the lead screw and a nut seat for mounting the nut. In the prior art, in order to facilitate the replacement of parts, the nut and nut seat are often set separately and fixed to the end of the nut seat by the flange part at the end of the nut. This not only facilitates the replacement of parts, but also allows the nut to be a standard part, which reduces the cost of use. However, the module will have the following problems when in use: (1) Due to the large rotational torque, the flange part at the end of the nut will be thicker to resist the torque, resulting in a certain amount of wasted stroke, which in turn increases the length of the module. It is not suitable for situations with relatively compact space, and it will also cause inconvenience in installation, especially when the stroke is short. As the operating space of the auxiliary tool is squeezed, the installation difficulty is greatly increased. (2) Since the nut mounting hole of the nut seat is larger than the outer diameter of the nut, there is a certain fit clearance between the nut and the nut seat, which may cause the nut and the nut seat to shift. This is unavoidable. Once there is a shift, it will greatly affect the life of the nut and also reduce the concentricity of the nut and the lead screw, thereby reducing the life of the module.

[0004] In summary, existing technologies, due to their failure to consider the design requirements of miniaturized modules and differences in installation precision, will cause a series of subsequent problems when using detachable nuts, resulting in increased overall module usage costs and reduced structural performance. Therefore, it is necessary to design a linear module with high concentricity, space-saving design, and easy installation. Utility Model Content

[0005] To address the technical problems of insufficient concentricity between the nut and the lead screw, large space occupation by the nut, and difficult installation in existing linear modules, this utility model provides a linear actuator and a linear module containing the same to solve the above problems.

[0006] This utility model proposes a linear actuator, including a lead screw, a nut seat, and an injection-molded nut. The lead screw and the injection-molded nut are threaded together. The nut seat has an internal mounting hole. The injection-molded nut is integrally injection-molded into the mounting hole. The inner surface of the mounting hole has several circumferentially extending and axially extending limiting grooves. The injection-molded nut forms limiting ribs at the limiting grooves.

[0007] In an optional embodiment of this utility model, the mounting hole extends through both ends of the nut seat.

[0008] In an optional embodiment of this utility model, the axial length of the injection nut is equal to the axial length of the mounting hole.

[0009] In an optional embodiment of this utility model, the limiting rib includes a straight limiting rib extending axially and an annular limiting rib extending circumferentially. Multiple straight limiting ribs are evenly distributed along the circumferential direction, and multiple annular limiting ribs are evenly distributed along the axial direction.

[0010] This utility model also proposes a linear module, including a drive motor, a linear guide rail, a slider, and the linear actuator described above. The slider is slidably engaged with the linear guide rail, the nut seat is fixed to the slider, and the drive motor drives the lead screw to rotate.

[0011] In an optional embodiment of this utility model, the linear module further includes a guide rail mounting base, a motor mounting base, and a bearing mounting base. The linear guide rail is fixed on the guide rail mounting base, and the motor mounting base and bearing mounting base are installed at both ends of the guide rail mounting base. The drive motor is fixed to the motor mounting base, and the two ends of the lead screw are supported by the bearing mounting base and the bearings inside the drive motor, respectively.

[0012] In an optional embodiment of this utility model, the bottom of the nut seat has a baffle extending toward the side of the slider, and the two baffles and the lower surface of the nut seat form a groove for locking the slider.

[0013] In an optional embodiment of this utility model, a reinforcing rib is fixed to one end of the motor mounting base facing the slider, and the reinforcing rib is connected to the guide rail mounting base.

[0014] In an optional embodiment of this utility model, two reinforcing ribs are provided, and the two reinforcing ribs are sandwiched on both sides of the linear guide rail.

[0015] In an optional embodiment of this utility model, buffer pads are provided on the opposing surfaces of the motor mounting base and the bearing mounting base.

[0016] The beneficial effects of this utility model are:

[0017] This invention involves injection molding the nut inside the nut seat, ensuring that the injection-molded nut is completely located inside the nut seat and does not obstruct the movement stroke of the lead screw. Furthermore, the injection-molded nut is limited by machining a limiting groove in the mounting hole of the nut seat to resist torque and prevent the injection-molded nut from detaching from the nut seat. This improves the overall motion accuracy of the linear module and facilitates the miniaturization design of the linear module. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is an axial sectional view of a specific embodiment of the linear actuator and linear module containing the present invention.

[0020] Figure 2 This is an exploded view of a specific embodiment of the linear actuator and linear module comprising the present invention;

[0021] Figure 3 This is a schematic diagram of the end face of the cross section where the injection-molded nut is located in this utility model;

[0022] Figure 4 This is a schematic diagram of the fit between the injection-molded nut and the nut seat in this utility model;

[0023] Figure 5 This is a schematic diagram of the fit between the motor mounting base and the linear guide rail in this utility model.

[0024] In the diagram, 1. Lead screw, 2. Nut seat, 3. Injection nut, 4. Mounting hole, 5. Limiting groove, 6. Limiting rib, 601. Linear limiting rib, 602. Circular limiting rib, 7. Drive motor, 8. Linear guide rail, 9. Slider, 10. Guide rail mounting base, 11. Motor mounting base, 12. Bearing mounting base, 13. Baffle, 14. Slot, 15. Reinforcing rib, 16. Buffer pad, 17. Bearing. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] Example 1

[0027] like Figures 1-4As shown, a linear actuator includes a lead screw 1, a nut seat 2, and a molded nut 3. The lead screw 1 and the molded nut 3 are threaded together. The nut seat 2 has a mounting hole 4 inside. The molded nut 3 is integrally molded into the mounting hole 4. The inner surface of the mounting hole 4 has several circumferentially extending and axially extending limiting grooves 5. The molded nut 3 forms limiting ribs 6 at the limiting grooves 5. The molded nut 3 is a columnar structure with threads on the inner surface and limiting ribs 6 on the outer surface. The lead screw 1 is a rotating component, and the nut seat 2 is a sliding component. When the lead screw 1 rotates, the molded nut 3 moves along a helical line relative to the lead screw 1, causing the molded nut 3 to move linearly, thereby driving the client to reciprocate. The cooperation between the limiting grooves 5 and the limiting ribs 6 can effectively eliminate the axial and radial movement of the molded nut 3.

[0028] Although the injection-molded nut 3 and nut seat 2 in this invention are non-separable and require replacement when parts are damaged, this invention offers significant advantages over traditional split structures in environments with high precision requirements and limited space. Firstly, this invention eliminates the installation process of the injection-molded nut 3, which is directly molded within the nut seat 2. Furthermore, it reduces the nut installation portion outside the nut seat 2, avoiding wasted stroke. With the same thread length, it reduces nut processing costs and improves cost-effectiveness. More importantly, this invention fully utilizes the length of the nut seat 2 to maximize the thread engagement length between the injection-molded nut 3 and the lead screw 1, thereby improving the concentricity of the injection-molded nut 3 and the lead screw 1, enhancing linear motion accuracy, and preventing displacement of the injection-molded nut 3 during movement, resulting in a longer module lifespan. Compared to the consumption of individual components, extending the lifespan of the entire module maximizes cost reduction; therefore, this invention offers greater advantages over traditional structures.

[0029] In order to fill the mounting hole 4 with injection molding material, the mounting hole 4 needs to penetrate at least one end of the nut seat 2. The length of the injection nut 3 determines the length of the threaded engagement between the injection nut 3 and the lead screw 1. The longer the thread length of the injection nut 3 within the effective space, the better the concentricity between the injection nut 3 and the lead screw 1, which can improve the overall stability. Therefore, this utility model preferably has the mounting hole 4 penetrating both ends of the nut seat 2. At this time, the axial length of the injection nut 3 can be set to be equal to the axial length of the mounting hole 4, so as to maximize the thread length of the injection nut 3.

[0030] The limiting rib 6 is used to eliminate axial and radial movement of the injection nut 3. The limiting rib 6 can be arranged at any angle on the outer surface of the injection nut 3. To ensure the limiting effect, in this embodiment, for example... Figure 2As shown, the limiting ribs 6 include axially extending straight limiting ribs 601 and circumferentially extending annular limiting ribs 602. Multiple straight limiting ribs 601 are evenly distributed along the circumference, and multiple annular limiting ribs 602 are evenly distributed along the axial direction. The straight limiting ribs 601 can eliminate the radial movement of the injection-molded nut 3, and the annular limiting ribs 602 can eliminate the axial movement of the injection-molded nut 3. The evenly distributed design ensures structural symmetry and balances the forces on the injection-molded nut 3.

[0031] Example 2

[0032] A linear module, such as Figure 1 and Figure 2 As shown, it includes a drive motor 7, a linear guide rail 8, a slider 9, and the linear actuator described above. The slider 9 is slidably engaged with the linear guide rail 8, the nut seat 2 is fixed to the slider 9, and the drive motor 7 drives the lead screw 1 to rotate.

[0033] During assembly, the linear guide 8 is usually fixed on the guide rail mounting base 10. The two ends of the guide rail mounting base 10 are equipped with motor mounting base 11 and bearing mounting base 12. The bearing mounting base 12 is equipped with a bearing 17. The motor mounting base 11 is used to install the drive motor 7. The positioning of the motor mounting base 11 and the guide rail mounting base 10 ensures the concentricity of the drive motor 7 and the lead screw 1. One end of the lead screw 1 is fixed to the inner ring of the bearing 17 inside the bearing mounting base 12, and the other end of the lead screw 1 passes through the motor mounting base 11 and is fixed to the inner ring of the bearing 17 inside the drive motor 7.

[0034] In order to improve the connection strength between the motor mounting base 11 and the guide rail mounting base 10, in a preferred embodiment, a reinforcing rib 15 is fixed to one end of the motor mounting base 11 facing the slider 9, and the reinforcing rib 15 is connected to the guide rail mounting base 10.

[0035] In other alternative embodiments, buffer pads 16 are provided on the opposing surfaces of the motor mounting base 11 and the bearing mounting base 12. The buffer pads 16 can prevent the slider 9 from impacting the motor mounting base 11 and the bearing mounting base 12.

[0036] Example 3

[0037] Based on Embodiment 2, in order to ensure good concentricity between the slider 9 and the linear guide 8, this embodiment is designed as follows: the bottom of the nut seat 2 has a baffle 13 extending towards the side of the slider 9, and the two baffles 13 and the lower surface of the nut seat 2 form a groove 14 to hold the slider 9 in place. Figure 3 and Figure 4 As shown.

[0038] In further design, two stiffeners 15 are provided, such as... Figure 5As shown, two reinforcing ribs 15 are clamped on both sides of the linear guide rail 8. The motor mounting base 11 secures the linear guide rail 8 with the two reinforcing ribs 15, resulting in a small gap. This ensures the parallelism between the guide rail mounting base 10 and the lead screw 1. The positioning of the two reinforcing ribs 15 and the slot 14 ensures that the straightness of the guide rail mounting base 10, the lead screw 1, and the slider 9 is consistent, improving stability and increasing the first-time assembly pass rate.

[0039] In the description of this utility model, it should be understood that the terms "center", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0041] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A linear actuator, characterized by: The linear motion mechanism comprises a screw rod (1), a nut seat (2) and an injection nut (3), the screw rod (1) is in threaded cooperation with the injection nut (3), the nut seat (2) has a mounting hole (4) in the interior, the injection nut (3) is integrally injection molded in the mounting hole (4), the inner surface of the mounting hole (4) has a plurality of limiting grooves (5) extending in the circumferential direction and the axial direction, and the injection nut (3) forms a limiting rib (6) at the limiting groove (5).

2. The linear actuator of claim 1, wherein: The mounting hole (4) penetrates through both ends of the nut seat (2).

3. The linear actuator of claim 2, wherein: The axial length of the injection nut (3) is equal to the axial length of the mounting hole (4).

4. The linear actuator of claim 1, wherein: The limiting rib (6) comprises straight limiting ribs (601) extending in the axial direction and annular limiting ribs (602) extending in the circumferential direction, the straight limiting ribs (601) are uniformly distributed in the circumferential direction, and the annular limiting ribs (602) are uniformly distributed in the axial direction.

5. A linear module, characterized by: The linear module further comprises a guide rail mounting seat (10), a motor mounting seat (11) and a bearing mounting seat (12), the linear guide rail (8) is fixed on the guide rail mounting seat (10), the motor mounting seat (11) and the bearing mounting seat (12) are mounted on both ends of the guide rail mounting seat (10), the driving motor (7) is fixed with the motor mounting seat (11), and both ends of the screw rod (1) are respectively supported by the bearing (17) in the bearing mounting seat (12) and the driving motor (7).

6. Linear module according to claim 5, characterized in that The bottom of the nut seat (2) has a baffle (13) extending to the side surface of the sliding block (9), and the two baffles (13) and the lower surface of the nut seat (2) form a clamping groove (14) clamping the sliding block (9).

7. The linear module according to claim 5, characterized in that: One end of the motor mounting seat (11) towards the sliding block (9) is fixed with a reinforcing rib (15), and the reinforcing rib (15) is connected with the guide rail mounting seat (10).

8. The linear module of claim 6, wherein: The reinforcing rib (15) is provided with two, and the two reinforcing ribs (15) are clamped on both sides of the linear guide rail (8).

9. Linear module according to claim 8, characterized in that The opposite surfaces of the motor mounting seat (11) and the bearing mounting seat (12) are respectively provided with a buffer pad (16).

10. The linear module of claim 6, wherein: The opposite surfaces of the motor mounting seat (11) and the bearing mounting seat (12) are respectively provided with a buffer pad (16).

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