A new low-noise waterproof electric push rod

Abstract

The utility model relates to electric push rod technical field especially, relates to a novel low noise waterproof electric push rod, solved the problem that electric push rod exists in the practical application process and the problem of insufficient waterproof performance of big noise, a novel low noise waterproof electric push rod, include: shell subassembly: lower shell, upper shell, main body, aluminium shell cover, rear support and guide sleeve, the opposite side of lower shell, upper shell all is equipped with the potting groove for filling sealant, and the rear support is equipped with the damping ring between main body, aluminium shell cover rear end is sleeved and has the flange shaft sleeve for positioning installation, and aluminium shell cover front end is inserted and has the flange guide sleeve, and fixed with guide sleeve, sealing assembly: including the elastomer of setting in the outside of aluminium shell cover, tail sealing ring no. One, tail sealing ring no. Two, middle sealing ring, front sealing ring no. One, front sealing ring no. Two form the multiple sealing structure of the utility model. The utility model can improve the waterproof performance of the utility model, reduce the noise when the utility model is running, improve the use experience.

Description

Technical Field

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

[0002] Electric linear actuators, which convert rotary motion into linear motion, have been widely used in industrial automation, medical care, smart homes, and transportation equipment due to their advantages such as precise control, compact structure, and environmental friendliness. However, with the diversification of application scenarios, the limitations of traditional electric linear actuators in terms of noise suppression and waterproof performance are becoming increasingly apparent.

[0003] In real-world applications, the noise from the push rod may disturb patients' rest or affect precision operations. For example, in smart home scenarios (such as electric beds), high decibel noise will directly impact the user experience. In outdoor or high-humidity environments (such as industrial machinery) or underwater, moisture intrusion can easily lead to short circuits in the motor or corrosion of transmission components, affecting the stability of equipment operation and shortening the equipment's lifespan.

[0004] To address this, a novel low-noise, waterproof electric actuator is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a new type of low-noise waterproof electric linear actuator to solve the problems of high noise and insufficient waterproof performance in practical applications of electric linear actuators.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A novel low-noise waterproof electric actuator includes: a housing assembly comprising a lower housing, an upper housing, a main body, an aluminum housing sleeve for support, a rear support, and a guide sleeve; the lower housing and the upper housing are fixed by ultrasonic welding, and each has a potting groove on its opposite side, the potting groove being filled with sealant, the potting groove extending to the inner surface of the adjacent rear support; the main body is disposed between the lower housing and the upper housing; the rear end of the aluminum housing sleeve is connected to the main body via a flange bushing, the flange bushing having several locking blocks circumferentially arranged along its outer edge, the locking blocks being embedded in the main body, the front end of the aluminum housing sleeve being inserted with a flange guide sleeve, the guide sleeve being pressed and fixed to the front end of the aluminum housing sleeve by bolts; the rear support is composed of two symmetrical independent parts spliced ​​together, the rear support being nested within the main body and extending rearward for connection to external equipment, the rear support having several bearings, and a shock-absorbing ring being sleeved between the rear support and the main body;

[0008] Drive assembly: includes a motor and a motor shaft driven by the motor, the motor being located inside the lower housing, and the motor shaft being rotatably supported on the motor body by a plurality of bearings;

[0009] Transmission assembly: Installed within the lower and upper housings via a main body positioning system, comprising a meshing worm and worm wheel, a rotating shaft, a linkage nut, and a push rod; the worm is integrally formed with the motor shaft; the rear end of the rotating shaft is fixedly connected to the worm wheel and rotatably supported by a bearing within the rear support; the front end of the rotating shaft is threadedly connected to the linkage nut; the linkage nut is slidably fitted within the aluminum housing; the push rod is sleeved on the outside of the linkage nut and extends to the outside of the aluminum housing, and is slidably connected to the aluminum housing; the front end of the push rod is sealed by a sealing plug.

[0010] Sealing assembly: includes an elastomer fitted onto the outside of the aluminum shell sleeve, the elastomer being reinforced through holes thereon, the elastomer being pressed between the lower shell and the upper shell, the elastomer being fitted onto the outside of the aluminum shell sleeve; tail sealing ring one and tail sealing ring two located between the rear support and the lower and upper shells; middle sealing ring located between the aluminum shell sleeve and the lower and upper shells; front sealing ring one located between the guide sleeve and the flange guide sleeve; and front sealing ring two located at the junction of the guide sleeve, the flange guide sleeve and the aluminum shell sleeve, the outer side of the rear support having a circular groove along the circumference for nesting and fixing tail sealing ring one and tail sealing ring two.

[0011] The bottom shell and the top shell are ultrasonically welded together and filled with sealant in the grouting groove to double seal the shell gaps. Multiple independent sealing rings (tail / middle / front sealing rings) and an elastomer compression structure form a multi-layer waterproof barrier to improve the waterproof rating. The elastomer reduces the vibration transmission of the aluminum shell sleeve, the shock-absorbing ring reduces the vibration transmission of the rotating shaft, and the vibration isolation washer (motor shaft) and shock-absorbing pad (motor) reduce the vibration transmission of the motor and the meshing noise of the worm gear.

[0012] Furthermore, a molten groove is provided on the side opposite to the upper shell of the lower shell. The molten groove extends to the inner side of the adjacent rear support. The molten groove is located outside the potting groove. The molten groove on the rear support can be sealed by either sealant or ultrasonic waves. The middle sealing ring and the tail sealing ring are both in contact with the molten groove.

[0013] The molten pool is located outside the potting tank, which expands the ultrasonic welding contact area, enhances the reliability of the shell connection, and prevents cracking due to external forces.

[0014] Furthermore, the rear edge of the flange guide sleeve is chamfered, and the front sealing ring is pressed against the chamfer.

[0015] The chamfered structure ensures that the front sealing ring 2 (O-ring) is evenly compressed, preventing sharp edges from cutting the sealing ring and improving the sealing effect.

[0016] Furthermore, the outer side of the elastomer is provided with several annular grooves, and the lower shell and the upper shell are symmetrically provided with several annular protrusions on their opposite sides, the annular protrusions being pressed into the annular grooves.

[0017] The annular groove of the elastomer and the annular protrusion of the shell form a mechanical interlock, which can improve the fixing effect of the elastomer and the sealing between the elastomer and the lower and upper shells.

[0018] Furthermore, a vibration isolation washer is provided between the bearing two on the lower outer side of the motor shaft and the motor body. The vibration isolation washer cuts off the high-frequency vibration transmission path of the motor shaft and the motor in the radial and axial directions, reducing noise at the source.

[0019] Furthermore, the outer side surface of the motor housing, the gap between the outer bottom surface and the lower housing are all provided with shock-absorbing pads. The gap between the motor and the housing is filled with shock-absorbing pads to prevent the motor from resonating with the housing when it is running, thereby further reducing noise transmission.

[0020] Furthermore, a cable sheath is provided on one side of the lower shell, and the cable sheath is pressed between the lower shell and the upper shell. Sealing bolts reinforced by compression are provided on both sides of the lower shell and the cable sheath. The cable sheath is sealed with the lower shell and the upper shell by sealant.

[0021] The cable sheath is pressed together to form a primary seal between the casings; the sealing bolts on both sides are squeezed and deformed to fill the gaps, thus solving the problem of water seepage at the cable inlet.

[0022] Furthermore, the second tail seal ring contacts the potting groove;

[0023] Among them, the second tail seal ring is located between the potting grooves, and the middle seal ring and the first tail seal ring are both located between the melting grooves, forming a "main sealant seal + secondary seal ring seal" combination sealing method, which directionally blocks the intrusion path of external moisture.

[0024] Furthermore, a support member is provided between the upper end of the worm and the upper shell, and the worm is rotatably connected to the support member;

[0025] Among them, the support component can further improve the stability of the worm gear during rotation, thereby reducing the noise generated by resonance during the rotation of the worm gear.

[0026] The beneficial effects of this utility model are as follows:

[0027] 1. A double sealing barrier is set up to improve the waterproof performance of this utility model. The potting groove and the melting groove form a double defense line of "glue sealing + welding". The ring groove of the elastomer and the ring protrusion are pressed together to form a labyrinth seal to prevent water vapor from entering along the axial direction of the aluminum shell. The double-layer tail sealing ring → middle sealing ring → double-layer front sealing ring cover all dynamic / static interfaces and provide directional sealing for different penetration paths. The cable sheath adopts a compression structure + sealing bolt extrusion reinforcement to prevent water seepage at the cable inlet.

[0028] 2.1 To reduce the noise during operation of this utility model and improve the user experience, the motor vibration damping pad is used to fill the gap between the motor and the lower shell, absorb the vibration energy of the motor, and block the noise transmission path. The motor shaft vibration isolation washer isolates the axial vibration generated by the high-speed rotation of the motor rotor and reduces structural resonance noise.

[0029] 2.2 The shock-absorbing ring is used to buffer the vibration transmission between the rear support and the main body, and to prevent the noise of the rotating shaft from being amplified through the connecting parts. The elastic body sleeved on the outside of the aluminum shell can further reduce the noise generated by vibration. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0031] Figure 2 This is a cross-sectional view of the lower shell of this utility model;

[0032] Figure 3 This is a schematic cross-sectional view of the motor of this utility model;

[0033] Figure 4 This is a cross-sectional schematic diagram of the connection structure between the guide sleeve and the aluminum shell sleeve of this utility model;

[0034] Figure 5 This is a schematic diagram of the elastomer structure of this utility model;

[0035] Figure 6 This is a schematic diagram of the partial waterproof structure of this utility model;

[0036] Figure 7 This is a schematic diagram of a partial structure of the rear support of this utility model;

[0037] Figure 8 This is an external view of the utility model in use.

[0038] Figure 9 This is a schematic diagram of the connection structure between the flange bushing and the main body of this utility model.

[0039] Reference numerals: 1. Lower shell; 2. Upper shell; 3. Main body; 4. Aluminum shell sleeve; 4a. Flange bushing; 4b. Clamping block; 5. Rear support; 6. Guide sleeve; 7. Encapsulation groove; 8. Bearing one; 9. Vibration damping ring; 10. Flange guide sleeve; 11. Motor; 12. Motor shaft; 13. Bearing two; 14. Worm gear; 15. Worm wheel; 16. Rotating shaft; 17. Linkage nut; 18. Push rod; 19. Elastomer; 20. Tail seal ring one; 21. Tail seal ring two; 22. Middle seal ring; 23. Front seal ring one; 24. Front seal ring two; 25. Melting tank; 26. Annular groove; 27. Annular protrusion; 28. Vibration isolation washer; 29. ​​Shock damping pad; 30. Cable sheath; 31. Sealing bolt; 32. Support component. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They 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. Therefore, they should not be construed as limitations on this utility model.

[0044] Reference Figure 1-9 A novel low-noise waterproof electric actuator includes a housing assembly: a lower housing 1 and an upper housing 2 are fixed into a main frame by ultrasonic melting welding. Continuous potting grooves 7 are opened on the opposite sides of the two, and the grooves are filled with epoxy sealant to form an overall sealing barrier. Melting grooves 25 are also provided on the sides of the two, located outside the potting grooves 7. Melting grooves 25 and potting grooves 7 both extend to the inner surface of the adjacent rear support 5 to form an overall sealing barrier.

[0045] The main body 3 is embedded between the lower shell 1 and the upper shell 2, providing a reference for the installation of internal components. The rear end of the aluminum shell sleeve 4 is connected to the main body 3 through a flange bushing 4a. The flange bushing 4a is clamped in the front end of the main body 3 by several locking blocks 4b to stabilize the connection between the flange bushing 4a and the main body 3. The front end of the aluminum shell sleeve 4 is inserted into the flange guide sleeve 10. The guide sleeve 6 is tightened with bolts to the flange guide sleeve 10 to achieve axial fixation with the aluminum shell sleeve 4.

[0046] The rear support 5 is composed of two symmetrical independent parts, nested inside the main body 3 and extending rearward to connect external equipment. It has multiple bearings 8 inside, and a shock-absorbing ring 9 is fitted between the rear support 5 and the main body 3 to absorb vibration.

[0047] It also includes a drive assembly: the motor 11 is fixed inside the lower shell 1, and its motor shaft 12 is rotatably supported by two bearings 13. A vibration isolation washer 28 is provided between the lower end of the motor shaft 12 and the motor body 11, and the gap between the side and bottom of the motor 11 and the lower shell 1 is filled with a shock-absorbing pad 29.

[0048] It also includes a transmission assembly: a worm gear 14 is fixedly connected to a motor shaft 12, and a support member 32 fixed in the main body 3 is provided at the upper end for stable connection of the upper end of the worm gear 14. A worm wheel 15 meshes with the worm gear 14, and the worm wheel 15 is formed by machining the front end of the motor shaft 12 that extends to the outside of the motor 11.

[0049] The rotating shaft 16 is supported by bearing 8 inside the rear support 5, and the middle section is supported by flange bushing 4a. The front end of the rotating shaft 16 is threadedly connected to the linkage nut 17, and the linkage nut 17 is slidably fitted inside the aluminum shell sleeve 4. The push rod 18 is sleeved on the outside of the linkage nut 17 and fixedly connected (any one of thread, welding, or snap-fit), extending to the outside of the aluminum shell sleeve 4 and slidably connected thereto.

[0050] It also includes a sealing component: an elastomer 19 is fitted on the outside of the aluminum shell 4 and is pressed between the lower shell 1 and the upper shell 2; two annular grooves 26 are opened on its outer side, which are pressed together with the corresponding annular protrusions 27 on the shell to form a seal.

[0051] Tail sealing ring 1 20 and tail sealing ring 21: They are embedded in the circular groove on the outside of the rear support 5, and are located inside the melting tank 25 and the potting tank 7 respectively. They seal the interface between the rear support 5 and the bottom / upper shell 2, and provide a double seal between the rear support 5 and the lower shell 1 and the upper shell 2.

[0052] Middle sealing ring 22: Located between aluminum shell 4 and bottom / upper shell 2, inside the molten pool;

[0053] Front sealing ring 1 23: located between guide sleeve 6 and flange guide sleeve 10; Front sealing ring 2 24: pressed onto the rear chamfer of flange guide sleeve 10, sealing the interface between guide sleeve 6, flange guide sleeve 10 and aluminum shell sleeve 4.

[0054] The cable sheath 30 is pressed between the lower shell 1 and the upper shell 2, and is reinforced on both sides by sealing bolts 31. The upper and lower sides of the cable sheath 30 and the extension position of the potting groove 7 are sealed with sealant to ensure that the cable inlet is waterproof.

[0055] Motor 11 drives worm gear 14 to rotate, which in turn drives worm wheel and shaft 16 to rotate, causing linkage nut 17 to move axially within aluminum housing 4, ultimately pushing push rod 18 to extend and retract linearly. Vibration is absorbed by multiple layers of damping ring 9, elastomer 19, vibration isolation washer 28, support 32, and damping pad 29, significantly reducing noise; moisture is blocked from the outside through sealant, elastomer 19, multiple sealing rings, and labyrinth structure.

Claims

1. A novel low-noise waterproof electric linear actuator, characterized in that, include: The housing assembly includes a lower shell (1), an upper shell (2), a main body (3), an aluminum shell sleeve (4) for support, a rear support (5), and a guide sleeve (6); the lower shell (1) and the upper shell (2) are fixed by ultrasonic melting welding, and each of their opposite sides is provided with a potting groove (7), which is filled with sealant and extends to the inner surface of the adjacent rear support (5); the main body (3) is disposed between the lower shell (1) and the upper shell (2); the rear end of the aluminum shell sleeve (4) is connected to the main body (3) through a flange bushing (4a), and the flange bushing (4a) The outer circumferential edge is provided with several locking blocks (4b), which are embedded in the main body (3). The front end of the aluminum shell sleeve (4) is connected to a flange guide sleeve (10). The guide sleeve (6) presses and fixes the flange guide sleeve (10) to the front end of the aluminum shell sleeve (4) by bolts. The rear support (5) is spliced ​​from two independent parts that are symmetrical to each other. The rear support (5) is nested in the main body (3) and extends backward for the connection of external equipment. The rear support (5) is provided with several bearings (8). A shock-absorbing ring (9) is sleeved between the rear support (5) and the main body (3). Drive assembly: includes a motor (11) and a motor shaft (12) driven by the motor (11). The motor (11) is located inside the lower housing (1). The motor shaft (12) is rotatably supported on the body of the motor (11) by a plurality of bearings (13). Transmission assembly: Positioned and installed in the lower shell (1) and upper shell (2) by the main body (3), including a worm (14) and worm wheel (15) meshing with each other, a rotating shaft (16), a linkage nut (17) and a push rod (18); the worm (14) is integrally formed with the motor shaft (12); the rear end of the rotating shaft (16) is fixedly connected to the worm wheel (15) and is rotatably supported by the bearing (8) in the rear support (5); the front end of the rotating shaft (16) is threadedly connected to the linkage nut (17); the linkage nut (17) is slidably fitted in the aluminum shell sleeve (4); the push rod (18) is sleeved on the outside of the linkage nut (17) and extends to the outside of the aluminum shell sleeve (4), and is slidably connected to the aluminum shell sleeve (4); the front end of the push rod (18) is sealed by a sealing plug; Sealing assembly: includes an elastomer (19) sleeved on the outside of the aluminum shell sleeve (4), the elastomer (19) being reinforced through holes thereon, the elastomer (19) being pressed between the lower shell (1) and the upper shell (2), the elastomer (19) being sleeved on the outside of the aluminum shell sleeve (4); tail sealing ring one (20) and tail sealing ring two (21) located between the rear support (5) and the lower shell (1) and the upper shell (2); middle sealing ring (22) located between the aluminum shell sleeve (4) and the lower shell (1) and the upper shell (2); front sealing ring one (23) located between the guide sleeve (6) and the flange guide sleeve (10); and front sealing ring two (24) located at the junction of the guide sleeve (6), the flange guide sleeve (10) and the aluminum shell sleeve (4), the outer side of the rear support (5) having a circular groove along the circumference for nesting and fixing tail sealing ring one (20) and tail sealing ring two (21).

2. The novel low-noise waterproof electric actuator according to claim 1, characterized in that, The lower shell (1) is provided with a melting groove (25) on the side opposite to the upper shell (2). The melting groove (25) extends to the inner side of the adjacent rear support (5). The melting groove (25) is located outside the potting groove (7). The melting groove (25) on the rear support can be sealed by either sealant or ultrasonic waves. The middle sealing ring (22) and the tail sealing ring (20) are in contact with the melting groove (25).

3. The novel low-noise waterproof electric actuator according to claim 1, characterized in that, The rear edge of the flange guide sleeve (10) is chamfered, and the second front sealing ring (24) is pressed against the chamfer.

4. The novel low-noise waterproof electric actuator according to claim 1, characterized in that, The outer side of the elastomer (19) is provided with several annular grooves (26), and several annular protrusions (27) are symmetrically provided on the side opposite to the upper shell (2) of the lower shell (1), and the annular protrusions (27) are pressed into the annular grooves (26).

5. A novel low-noise waterproof electric actuator according to claim 1, characterized in that, A vibration isolation washer (28) is provided between the bearing 2 (13) on the lower outer side of the motor shaft (12) and the motor body (11).

6. A novel low-noise waterproof electric actuator according to claim 1, characterized in that, The outer side of the motor housing, the outer bottom surface and the gap between the lower housing (1) are provided with shock-absorbing pads (29).

7. A novel low-noise waterproof electric actuator according to claim 1, characterized in that, The lower shell (1) is provided with a cable sheath (30) on one side. The cable sheath (30) is pressed between the lower shell (1) and the upper shell (2). Sealing bolts (31) reinforced by compression are provided on both sides of the lower shell (1) and the cable sheath (30).

8. A novel low-noise waterproof electric actuator according to claim 1, characterized in that, The tail seal ring 2 (21) is in contact with the potting groove (7).

9. A novel low-noise waterproof electric actuator according to claim 1, characterized in that, A support member (32) is provided between the upper end of the worm (14) and the main body (3), and the worm (14) is rotatably connected to the support member.

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