A low-noise small electric push rod

Abstract

The utility model discloses a low noise small -size electric push rod, including the casing, screw rod, push rod and the motor of drive screw rod rotation, the casing adopts two half plastic shell splicing and is formed, the motor output fixedly has worm, and the one end fixedly has the worm wheel of meshing with worm of setting in the casing rotation of screw rod, and worm wheel and worm all adopt the plastic material quality, and one side is equipped with the noise reduction subassembly in the worm wheel worm wheel meshing department of casing, the utility model discloses a casing of adopting the plastic material quality, worm wheel and worm, cooperate the noise reduction subassembly, can effectively reduce the noise of electric push rod use process generation.

Description

Technical Field

[0001] This utility model relates to an electric linear actuator, specifically a low-noise, small electric linear actuator. Background Technology

[0002] As people's living standards continue to improve, most daily work and life are assisted by fully automatic or semi-automatic equipment. Electric linear actuators are a common type of equipment in daily life. However, the electric linear actuators sold on the market now are all-metal gear structures, which generate a lot of noise when in use, especially when lifting heavy objects or supporting items. How to solve this problem is urgent. Utility Model Content

[0003] The purpose of this invention is to provide a low-noise, small electric linear actuator to solve the aforementioned technical problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-noise small electric linear actuator, comprising a housing, a lead screw, a push rod, and a motor for driving the lead screw to rotate. The housing is made of two halves of a plastic shell joined together. A worm gear is fixed to the output end of the motor. A worm wheel that meshes with the worm gear is fixed to one end of the lead screw, which is rotatably disposed inside the housing. Both the worm wheel and the worm gear are made of plastic. A noise reduction component is provided on one side of the worm wheel and worm gear meshing point inside the housing.

[0005] Preferably, a rotating bearing is fixed on the outer wall of the section of the lead screw located inside the housing. The rotating bearing has two sets located on the front and rear sides of the worm gear, respectively, and is rotatably connected inside the housing.

[0006] Preferably, the noise reduction component includes a noise reduction plate and sound-absorbing cotton. The noise reduction plate has a shaft hole corresponding to the axial position of the worm gear. The shaft of the worm gear extends into the shaft hole and is rotatably disposed in the shaft hole through a bearing. The sound-absorbing cotton is disposed in the shaft hole. The shaft of the worm gear has a shaft cavity, and the opening of the shaft cavity faces the position of the sound-absorbing cotton.

[0007] Preferably, the worm gear is provided with multiple sets of sound-absorbing holes, which are connected to the shaft cavity.

[0008] Preferably, the noise reduction plate is provided with an oil cavity, and the lowering plate is also provided with an oil guide pipe below the shaft hole. One end of the oil guide pipe extends outward and faces the meshing point of the worm gear and worm, and the other end of the oil guide pipe is connected to the oil cavity. The upper part of the oil cavity is connected to the shaft hole.

[0009] Preferably, a pressure plate is axially slidably provided inside the shaft hole.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: By using a plastic housing, worm gear, and worm shaft instead of a metal gear meshing structure, the harsh noise generated by metal meshing vibration during the extension and retraction of the drive push rod is effectively reduced. By setting a noise reduction plate with sound-absorbing cotton inside, a shaft cavity inside the worm gear, and sound-absorbing holes on the worm gear that communicate with the shaft cavity, noise is effectively guided to the sound-absorbing cotton for noise reduction. A pressure plate and an oil cavity are slidably set inside the noise reduction plate. The noise reduction plate is also equipped with an oil guide pipe with one end facing the meshing point of the worm gear. It can use the thrust generated by the noise to push the pressure plate and drive the lubricating oil in the oil chamber to flow through the oil guide pipe to the meshing point of the worm gear, further reducing the noise generated when the worm gear drives the lead screw to rotate. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1; Figure 2 This is an exploded view of the overall structure of Embodiment 1; Figure 3 This is a schematic diagram of the structure highlighting the location of the noise reduction component in Embodiment 2; Figure 4 This is a schematic diagram of the noise reduction component highlighted in Embodiment 2.

[0013] The attached diagram lists the components represented by each number as follows: 1. Housing; 2. Motor; 3. Lead screw; 4. Push rod; 5. Worm gear; 6. Worm wheel; 7. Rotary bearing; 8. Noise reduction assembly; 81. Noise reduction plate; 82. Sound-absorbing cotton; 9. Shaft hole; 10. Shaft cavity; 11. Sound-absorbing hole; 12. Oil cavity; 13. Oil guide pipe; 14. Pressure plate; 15. Bearing. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4 The present invention provides a first embodiment: The low-noise miniature electric actuator 4 disclosed in this embodiment has noise reduction as its core objective. It mainly consists of a housing 1, a lead screw 3, a push rod 4, a motor 2 that drives the lead screw 3, and a noise reduction component 8. The motor 2 is fixed inside the housing 1 via a mounting slot (existing technology). The components form a stable transmission system through precise connection and positioning, simultaneously achieving a low-noise effect. The method of the lead screw 3 rotating to drive the push rod 4 in telescopic motion is existing technology and will not be elaborated upon. Furthermore, the housing 1, serving as the mounting and protective carrier for the entire device, is assembled from two halves of a plastic shell. This assembly structure not only facilitates the assembly and subsequent maintenance of internal components, but the plastic material itself also effectively reduces vibration transmission compared to a traditional metal housing 1.

[0016] Motor 2 is fixedly installed in a preset mounting position inside the housing 1. The output end of motor 2 is fixedly connected to worm 5. The rod of worm 5 can be bolted to the output end of motor 2. After motor 2 starts, it can directly drive worm 5 to rotate synchronously. One end of lead screw 3 is rotatably set inside housing 1. The end of lead screw 3 near motor 2 is bolted to worm wheel 6. Worm wheel 6 and worm 5 are in a perpendicular meshing state. Both are made of high-strength engineering plastic material, replacing the all-metal gear structure of traditional electric push rod 4, reducing the harsh vibration and noise generated by rigid metal meshing from the transmission source. To further improve the stability of the lead screw 3 rotation and avoid additional friction noise caused by the lead screw 3 shaking, two sets of rotating bearings 7 are fixedly sleeved on the outer wall of the section of the lead screw 3 located inside the housing 1. The two sets of bearings 15 are symmetrically distributed on the front and rear sides of the worm gear 6, and the outer ring of the bearing 15 is rotatably connected to the bearing 15 seat on the inner wall of the housing 1. The bearings 15 provide axial positioning and radial support for the lead screw 3, ensuring that the lead screw 3 always rotates smoothly along its own axis.

[0017] The present invention provides a second embodiment: the main difference between this embodiment and the first embodiment is that a noise reduction component 8 is added inside the housing 1, as detailed below.

[0018] A noise reduction component 8 is fixedly installed inside the housing 1 on one side corresponding to the meshing point of the worm gear 6 and the worm 5. The noise reduction component 8 consists of a noise reduction plate 81 and sound-absorbing cotton 82. The noise reduction plate 81 is a rigid plate, and its edges are fixed by bolts, clips, or integral injection molding. A through shaft hole 9 is opened on the noise reduction plate 81 corresponding to the axial direction of the worm 5. The shaft of the end of the worm 5 away from the motor 2 extends into the shaft hole 9 and is rotatably connected to the hole wall of the shaft hole 9 through the bearing 15, which not only ensures that the rotation of the worm 5 is not hindered, but also provides support for the end of the worm 5. The sound-absorbing cotton 82 is made of porous sound-absorbing material and is tightly sealed in the shaft hole 9 at the end away from the worm 5. At the same time, a cylindrical shaft cavity 10 is opened along its axial direction inside the shaft of the worm 5. The opening end of the shaft cavity 10 is set directly opposite the sound-absorbing cotton 82. Multiple sets of sound-absorbing holes 11 are evenly distributed on the outer peripheral wall of the worm 5. The sound-absorbing holes 11 penetrate the tube wall radially along the worm 5 and communicate with the inside of the shaft cavity 10. The noise generated by the meshing of the worm wheel 6 and the worm 5 will enter the shaft cavity 10 through the sound-absorbing holes 11, and then be guided by the shaft cavity 10 to the sound-absorbing cotton 82 for absorption and dissipation.

[0019] To achieve automatic lubrication of the meshing surfaces and further reduce friction noise, a sealed oil cavity 12 is provided inside the noise reduction plate 81. The oil cavity 12 is used to store lubricating oil in advance. An oil guide tube 13 is integrally formed at the position of the noise reduction plate 81 below the shaft hole 9. One end of the oil guide tube 13 extends outward and is precisely oriented toward the meshing tooth surface of the worm gear 6 and the worm 5. The other end is connected to the bottom of the oil cavity 12. The upper part of the oil cavity 12 is connected to the inside of the shaft hole 9 through a narrow channel. In addition, an axially sliding pressure plate 14 is provided inside the shaft hole 9. The outer peripheral wall of the pressure plate 14 is tightly fitted with the hole wall of the shaft hole 9 to form a seal. When the worm gear 6 and worm 5 mesh and generate noise, the small vibration air pressure generated by the noise will slowly push the pressure plate 14 to slide axially along the shaft hole 9, thereby helping to squeeze the lubricating oil in the oil chamber 12, so that the lubricating oil flows into the oil guide pipe 13 through the channel, and finally drips onto the meshing point of the worm gear 6 and worm 5, providing real-time lubrication to the meshing surface. This reduces the noise generated by friction and improves the smoothness of transmission and the service life of components.

[0020] In summary, this embodiment reduces metal vibration noise at its source by using a plastic housing 1, worm gear 6, and worm 5. It also improves the rotational stability of the lead screw 3 by using two sets of rotating bearings 7 to reduce shaking noise. Furthermore, it absorbs noise by using the sound-absorbing holes 11, shaft cavity 10, and sound-absorbing cotton 82 of the noise reduction component 8. At the same time, it uses noise pressure to drive the pressure plate 14 to complete automatic lubrication. The synergistic effect of multiple technical features effectively solves the problem of excessive noise in traditional electric push rods 4. The overall structure is compact and the noise reduction effect is significant.

[0021] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on 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.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that modifications may be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-noise, small electric linear actuator, comprising a housing (1), a lead screw (3), a push rod (4), and a motor (2) for driving the lead screw (3) to rotate, characterized in that: The housing (1) is made of two plastic shells spliced ​​together. The output end of the motor (2) is fixed with a worm (5). The lead screw (3) is rotatably set inside the housing (1) and a worm wheel (6) is fixed to mesh with the worm (5). The worm wheel (6) and the worm (5) are both made of plastic. A noise reduction component (8) is provided on one side of the meshing point of the worm wheel (6) and the worm (5) inside the housing (1).

2. The low-noise miniature electric linear actuator according to claim 1, characterized in that: The lead screw (3) is fixed with a rotating bearing (7) on the outer wall of the section inside the housing (1). The rotating bearing (7) has two sets and is located on the front and rear sides of the worm gear (6). The rotating bearing (7) is rotatably connected inside the housing (1).

3. A low noise, compact electric trolley according to claim 1, characterized in that: The noise reduction component (8) includes a noise reduction plate (81) and sound-absorbing cotton (82). The noise reduction plate (81) has a shaft hole (9) corresponding to the axial position of the worm (5). The shaft of the worm (5) extends into the shaft hole (9) and is rotatably disposed in the shaft hole (9) through a bearing (15). The sound-absorbing cotton (82) is sealed in the shaft hole (9). The shaft of the worm (5) has a shaft cavity (10), and the opening of the shaft cavity (10) faces the position directly opposite to the sound-absorbing cotton (82).

4. A low-noise, small electric linear actuator according to claim 3, characterized in that: The worm (5) is provided with multiple sets of sound-absorbing holes (11), and the sound-absorbing holes (11) are connected to the shaft cavity (10).

5. A low-noise, small electric linear actuator according to claim 3, characterized in that: The noise reduction plate (81) is provided with an oil cavity (12). The lower plate is located below the shaft hole (9) and is also provided with an oil guide pipe (13). One end of the oil guide pipe (13) extends outward and faces the meshing point of the worm gear (6) and the worm (5). The other end of the oil guide pipe (13) is connected to the oil cavity (12). The upper part of the oil cavity (12) is connected to the shaft hole (9).

6. A low-noise, small electric linear actuator according to claim 5, characterized in that: A pressure plate (14) is axially slidably provided inside the shaft hole (9).

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