Protective low-noise electric push rod

Abstract

The utility model relates to electric push rod technical field especially is a kind of protective low-noise electric push rod, including shell part, inner drive part and inner transmission part;Shell part includes the upper shell part and lower shell part of threaded connection;Inner transmission part is set as threaded rod;Threaded rod surface layer is equipped with sliding nut, and threaded rod is equipped with the rod body outside sliding nut, and sliding nut outer surface is equipped with slider, and the inner surface of upper shell part is equipped with linear slide, and slider is in linear slide;When the rod body moves relative to upper shell part, the both ends of upper shell part are equipped with rubber protective washer;In upper shell part extension end limit part and upper shell part retract end limit part are equipped with rubber protective washer;When the rod body extends and retracts, when moving to limit part position, it is formed flexible contact by rubber protective washer, and the rod body itself and inner transmission part whole can be effectively protected.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, and in particular to a protective low-noise electric linear actuator. Background Technology

[0002] An electric linear actuator is a mechanical device that converts the rotary motion of an electric motor into linear motion. Its core components include a motor, a transmission mechanism (such as a screw, gear, or belt), the actuator body, and a control unit. It features precise control, high load capacity, and programmability, and is widely used in industrial automation, medical equipment, and home appliances.

[0003] In the design of electric linear actuators, while considering the compactness of the structural assembly, the following problems also need to be considered: (1) When the rod extends to the end limit and when it retracts to the reset limit, there will be a collision phenomenon. That is, if the rod is limited at both the extension and retraction ends for a long time, it will cause damage to the rod; (2) It is also necessary to achieve low noise to meet the noise standards of conventional electric linear actuators (such as the electric linear actuators used in office equipment, home appliances and other usage scenarios, the standard is below 60dB); Therefore, a new protective low-noise electric linear actuator can be designed. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0005] A protective low-noise electric actuator includes a housing, an internal drive, and an internal transmission. The housing comprises a threaded upper housing and a lower housing. The internal drive is mounted inside the lower housing, and the internal transmission is mounted inside the upper housing. The internal drive drives the internal transmission. The internal transmission is a threaded rod. A sliding nut is mounted on the surface of the threaded rod, and a rod body is connected to the sliding nut. A slider is provided on the outer surface of the sliding nut. A linear slide is provided on the inner surface of the upper housing, and the slider is located within the linear slide. When the rod body moves relative to the upper housing, rubber protective washers are provided at both ends of the upper housing for the rod body.

[0006] Furthermore, the upper shell end is provided with a through hole for the rod to extend and retract.

[0007] Furthermore, a positioning protrusion is provided on the inner wall of the lower shell, and the inner drive part is a drive motor. The drive motor consists of an upper layer and a lower layer composed of a motor and a reduction gearbox. The connection between the upper and lower layers of the drive motor abuts against the positioning protrusion, and a gap is left between the drive motor and the inner wall of the lower shell.

[0008] Furthermore, the upper end of the drive motor is provided with a reduction gearbox, and the outer end of the reduction gearbox is provided with a flat plug; one end of the threaded rod is provided with an assembly that connects to the reduction gearbox, and the assembly is provided with a socket that matches the flat plug.

[0009] Furthermore, an intermediate connecting component is assembled between the internal drive part and the internal transmission part; the intermediate connecting component includes a coupling assembly installed at the insertion hole of the plug and a fixed base for fixing the drive motor, the outer surface of the fixed base is threaded to the inner surface of the upper shell; the fixed base and the gearbox at the end of the drive motor are matched with positioning screw holes, the fixed base and the drive motor are assembled by screws, and a shock-absorbing rubber pad is provided between the fixed base and the drive motor.

[0010] Furthermore, the coupling assembly includes a sleeve with a pin inserted through it, and the pin passes through the threaded rod for fixation.

[0011] Furthermore, a bearing is provided between the coupling assembly and the sliding nut, which is fitted onto the surface of the threaded rod.

[0012] Furthermore, a transmission line for signal connection with the drive motor is also provided in the lower shell.

[0013] Furthermore, the rear end of the lower shell is provided with an extension strip, and holes are provided on both the extension strip and the rod.

[0014] Furthermore, a limiting and anti-blocking layer is loaded at the through hole of the upper shell.

[0015] The beneficial effects of this utility model are:

[0016] (1) Compared with the prior art, rubber protective gaskets are provided at both the extension end limiting part and the retraction end limiting part of the upper shell; that is, when the rod extends and retracts, when it moves to the limiting part position, it is in flexible contact with the rubber protective gasket, which can effectively protect the rod itself and the entire internal transmission part.

[0017] (2) By leaving a gap between the drive motor and the inner wall of the lower shell, the noise from vibration to the outside can be effectively reduced;

[0018] (3) During the assembly of the drive motor with the internal transmission part through the coupling assembly, the rigid assembly is transformed into a flexible assembly by loading a shock-absorbing rubber pad between the drive motor and the coupling assembly. This effectively reduces the generation of noise during torque transmission.

[0019] (4) The drive motor and the threaded rod are assembled in a matching flat assembly. The flat plug design enhances torque transmission efficiency and makes the power transmission more stable during driving, thereby ensuring that the threaded rod rotates.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention in its retracted state.

[0022] Figure 2 This is a schematic diagram of the extended state structure of this utility model.

[0023] Figure 3 Based on Figure 2 Schematic diagram of the decomposition structure.

[0024] Figure 4 This is a cross-sectional view of the connection between the internal drive section and the internal transmission section.

[0025] Figure 5 This is a schematic diagram of the connection between the internal drive section and the internal transmission section.

[0026] Figure 6 Based on Figure 3 A schematic diagram of a local part of the structure.

[0027] The labels in the attached figures are as follows:

[0028] Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Please see Figures 1-6This utility model includes an outer shell portion 1, an inner drive portion 2, and an inner transmission portion 3. The outer shell portion 1 includes an upper shell portion 101 and a lower shell portion 102 connected by threads. The inner drive portion 2 is assembled inside the lower shell portion 102, and the inner transmission portion 3 is assembled inside the upper shell portion 101. The inner drive portion 2 is used to drive the inner transmission portion 3 to push. The inner transmission portion 3 is a threaded rod 301. A sliding nut 304 is assembled on the surface of the threaded rod 301. A rod body 305 is connected to the outside of the sliding nut 304, and a slider 306 is provided on the outside of the sliding nut 304. A linear slide 307 is provided on the inner surface of the upper shell portion 101, and the slider 306 is located in the linear slide 307. When the rod body 305 moves relative to the upper shell portion 101, the two ends of the upper shell portion 101 are provided with an extension end limiting part and a retraction end limiting part for the movement position of the rod body 305. Both the extension end limiting part and the retraction end limiting part of the upper shell portion 101 are provided with rubber protective gaskets.

[0031] The main focus of this technical solution is the assembly of the structure:

[0032] It is mainly assembled and cooperated by the outer shell part 1, the inner drive part 2 and the inner transmission part 3. Specifically, the outer shell part 11 includes an upper shell part 101 and a lower shell part 102 connected by threads. At the connection between the two, the outer surface of the upper shell part 101 is provided with threads, and the inner surface of the lower shell part 102 is provided with threads. After the upper shell part 101 and the lower shell part 102 are completed by thread assembly, the overall appearance surface is smooth and simple, and the internal mechanism is protected and the structural stability is enhanced.

[0033] To achieve the pushing action of the electric actuator, a through hole 104 for the extension and retraction of the rod 305 is provided at the end of the upper shell 101. A sliding nut 304 is mounted on the surface of the threaded rod 301, with the rod 305 connected to the outside of the sliding nut 304. A slider 306 is provided on the outer surface of the sliding nut 304, and a linear slide 307 is provided on the inner surface of the upper shell 101. The slider 306 is located in the linear slide 307. The working principle of the rod 305 is as follows: when the threaded rod 301 is driven to rotate by the drive motor 201, the sliding nut 304 will rotate axially in sync. Due to the cooperation between the slider 306 on the outer surface of the sliding nut 304 and the linear slide 307 on the inner surface of the upper shell 101, the sliding nut 304 will move along the linear slide to guide the rod 305 to extend into the through hole 104 or retract.

[0034] Regarding the protection of the internal assembly, the main focus is on the protective design of the rod 305. Specifically, when the rod 305 moves relative to the upper shell 101, the upper shell 101 has an extension end limiting part and a retraction end limiting part at both ends for the movement position of the rod 305. Both the extension end limiting part and the retraction end limiting part of the upper shell 101 are equipped with rubber protective gaskets. The principle is that when the rod 305 extends, retracts, and retracts, when it moves to the limiting part position, it forms a flexible contact with the rubber protective gasket 309, which can effectively protect the rod 305 itself and the entire internal transmission part 3, thereby effectively playing a protective role.

[0035] Meanwhile, a bearing 308 is provided between the coupling assembly 401 and the sliding nut 304 and is sleeved on the surface of the threaded rod 301. Its purpose is to help the threaded rod 301 reduce friction and avoid radial displacement that would cause a hard collision with the inner wall of the upper shell 101.

[0036] The lower housing 102 is also provided with a transmission line 103 for signal connection with the drive motor 201, and the drive motor 201 is controlled by the transmission line 103.

[0037] Regarding the principle of internal assembly, specifically, a positioning protrusion 105 is provided on the inner wall of the lower shell 102. The internal drive part 2 is a drive motor 201. The drive motor 201 consists of an upper and a lower layer composed of a motor and a reduction gearbox. The connection between the upper and lower layers of the drive motor 201 abuts against the positioning protrusion 105. A gap 205 is left between the drive motor 201 and the inner wall of the lower shell 102. The assembly is as follows: the drive motor 201 is placed in the lower shell 102 from the front end. The upper wall thickness of the drive motor 201 is made thicker so that the upper wall thickness of the drive motor 201 can just abut against the positioning protrusion 105. Then, it is finally formed and assembled through the cooperation of the insertion hole 303 and the insertion post 204 and the assembly action of the fixed base 402. After assembly, the positioning protrusion 105 serves two purposes: firstly, it positions the drive motor 201 for mounting; secondly, it provides support and load-bearing capacity while creating a gap between the surface of the drive motor 201 and the inner wall of the lower shell 102. As a result, compared to the noise caused by vibration from the drive motor 201 being in close contact with the shell, this assembly method effectively reduces the noise from external vibration.

[0038] The upper end of the drive motor 201 is a reduction gearbox 202. The reduction gearbox 202 has a flat insert 204 at its outward end. The inner transmission part 3 is a threaded rod 301. One end of the threaded rod 301 is an assembly 302 connected to the reduction gearbox 202. The assembly 302 has a socket 303 that matches the flat insert 204. That is, with the insertion 204 and the socket 303 cooperating, the final housing realizes power transmission. When the drive motor 201 is driven, the motor 201 drives the reduction gearbox 202 to reduce speed and increase torque. The threaded rod 301 and the output shaft insert 204 of the reduction gearbox 202 rotate synchronously.

[0039] Meanwhile, in order to strengthen the assembly connection between the two, an intermediate connector 4 is provided at the position where the insert post 204 is inserted into the insertion hole 303, specifically including a coupling assembly 401 and a fixed seat 402; as shown in the figure, the coupling assembly 401 mainly includes a sleeve 403, on which a pin 404 is inserted and the pin 404 passes through the threaded rod 301 for fixation. The sleeve 403 is provided with a snap-fit ​​part to lock the assembly 302, and a pin 404 inserted into the threaded hole for fixation. That is, the threaded rod 301 and the drive shaft of the drive motor 201 are fitted with a sleeve 403 to achieve stable power transmission and avoid radial displacement between the two. The outer surface of the fixed base 402 is threaded, and the inner surface of the upper shell 101 is threaded, that is, the fixed base 402 is threaded to the upper shell. At the same time, the fixed base 402 and the gearbox 202 at the end of the drive motor 201 are matched with positioning screw holes 405. The fixed base 402 and the drive motor 201 are assembled by screws. Thus, the drive motor 201 and the upper shell 101 are further reinforced and fixed by the action of the fixed base 402, ensuring their stability.

[0040] The above describes the main structural compactness and robustness of the assembly.

[0041] Meanwhile, in order to further reduce vibration, a damping rubber pad 206 is provided between the fixed base 402 and the drive motor 201 in the design. The purpose is that during the assembly of the drive motor 201 with the inner transmission part 3 through the coupling assembly 401, the damping rubber pad 206 is loaded between the drive motor 201 and the coupling assembly 401 to change the rigid assembly into a flexible assembly. In this way, the noise generation can be effectively reduced during the torque transmission process.

[0042] Meanwhile, the rear end of the lower shell 102 is also provided with an extension strip 106. Both the extension strip 106 and the rod 305 are provided with holes 107. The holes 107 are mainly used for assembling and connecting the electric push rod with other equipment.

[0043] A limiting and anti-blocking layer 108 is loaded at the through hole 104 of the upper shell 101. The limiting and anti-blocking layer 108 serves as a guide and limits the locking of the slider nut 304.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A protected low noise electric trolley characterised in that: It includes a shell part (1), an inner driving part (2) and an inner transmission part (3); the shell part (1) includes a screw-connected upper shell part (101) and a lower shell part (102); the inner driving part (2) is assembled in the lower shell part (102), and the inner transmission part (3) is assembled in the upper shell part (101); the inner driving part (2) is used for driving the inner transmission part (3) to push; The inner transmission part (3) is provided as a threaded rod (301); a sliding nut (304) is assembled on the surface of the threaded rod (301); a rod body (305) is connected with the sliding nut (304); a sliding block (306) is arranged on the outer surface of the sliding nut (304); a linear slide (307) is arranged on the inner surface of the upper shell part (101); and the sliding block (306) is located in the linear slide (307). When the rod body (305) moves relative to the upper shell part (101), rubber protective washers (309) are arranged on both ends of the rod body (305).

2. The low noise electric push rod of claim 1, wherein: And the upper shell part (101) is provided with a through hole (104) for the extension and retraction of the rod body (305).

3. The low noise electric push rod of claim 2, wherein: A positioning protrusion (105) is arranged on the inner wall of the lower shell part (102); the inner driving part (2) is provided as a driving motor (201); the driving motor (201) is composed of a motor and a reduction box (202); the upper layer and the lower layer of the driving motor (201) are abutted at the position of the positioning protrusion (105); and a gap (205) is left between the driving motor (201) and the inner wall of the lower shell part (102).

4. The low noise electric push rod of claim 3, wherein: The upper end of the driving motor (201) is provided with the reduction box (202); the reduction box (202) is provided with a flat insertion column (204) at the outer end; one end of the threaded rod (301) is provided with an assembly part (302) connected with the reduction box (202); the assembly part (302) is provided with a insertion hole (303) matched with the flat insertion column (204).

5. The protective low-noise electric push rod according to claim 1, wherein: An intermediate connecting part (4) is assembled between the inner driving part (2) and the inner transmission part (3); the intermediate connecting part (4) includes a connecting shaft assembly (401) installed at the position where the insertion column (204) is inserted into the insertion hole (303), and a fixed seat body (402) fixed with the driving motor (201); the outer surface of the fixed seat body (402) is screwed with the inner surface of the upper shell part (101); The fixed seat body (402) is matched with a positioning screw hole (405) at the end of the reduction box (202) of the driving motor (201); the fixed seat body (402) and the driving motor (201) are assembled by screws; and a shock-absorbing rubber gasket (206) is arranged between the fixed seat body (402) and the driving motor (201).

6. The low noise, shielded electric push rod of claim 5, wherein: The connecting shaft assembly (401) includes a sleeve (403) with a pin (404) inserted through; the pin (404) penetrates the threaded rod (301) to be fixed.

7. The low noise, shielded electric push rod of claim 6, wherein: A bearing (308) is arranged on the surface of the threaded rod (301) between the connecting shaft assembly (401) and the sliding nut (304).

8. The low noise electric push rod of claim 1, wherein: The lower shell part (102) is also provided with a transmission line (103) for signal connection with the driving motor (201).

9. The low noise electric push rod of claim 2, wherein: The rear end of the lower shell part (102) is also provided with an extension strip (106), and the extension strip (106) and the rod body (305) are both provided with a hole position (107).

10. The low noise electric push rod of claim 2, wherein: The upper shell part (101) is loaded with a limiting anti-blocking layer (108) at the through hole (104).

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