A new type of electric push rod

Abstract

A new type of electric push rod includes a drive motor; a worm gear assembly, which is connected to the drive motor; a fixed housing, in which the worm gear assembly is accommodated and can reciprocate within the fixed housing; a screw rod, which passes through the fixed housing and is fixedly connected to an external component to be adjusted at one end in its length direction and has a screw rod connection seat at the other end, and the screw rod is in transmission cooperation with the worm gear assembly; a slide plate, one end of which is connected to the screw rod connection seat, and an arc-shaped guide slot is provided on the slide plate body. A fixed housing guide rod is provided on the side surface of the fixed housing facing the slide plate, and the guide slot is mounted on the fixed housing guide rod. The screw rod can drive the slide plate to reciprocate on the fixed housing guide rod and realize the reciprocating motion of the screw rod itself along the moving trajectory of the guide slot. The angle adjustment of the adjustable position product can be completed efficiently and quickly, the overall structure is simple, the number of parts is small, the processing materials are reduced, and it is easy to assemble and convenient to maintain.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical transmission equipment, and particularly relates to a novel electric push rod. Background Art

[0002] The aforementioned electric linear actuator is an electric drive device that converts the rotational motion of an electric motor into the linear reciprocating motion of a screw or push rod. It is a motion drive unit widely used in industries such as industrial automation, home furniture, medical equipment, and automobiles. It can be used in products with adjustable body positions, such as home electric beds, leisure massage beds, electric rehabilitation beds, dental beds, elderly standing chairs, massage chairs, and car seats, to adjust the angles of related components and thus adjust the body to the appropriate position. Electric linear actuators can efficiently achieve remote control, centralized control, or automatic control, thereby meeting the diverse needs of users. Due to their greater environmental protection, efficiency, and tight control advantages, electric linear actuators have gradually replaced the original hydraulic cylinders and pneumatic cylinders, gaining favor with relevant manufacturers and users. The existing electric push rod mainly includes a drive motor, a worm gear reduction mechanism, a main housing, a screw and a transmission nut. The output end of the drive motor is connected to the worm gear reduction mechanism, and the output end of the worm gear reduction mechanism is connected to the screw. A bearing for the screw to pass through is provided at the end of the main housing near the worm gear reduction mechanism, and the transmission nut is sleeved on the screw. The motor drives the screw to rotate, thereby driving the transmission nut to move linearly, and a limiting guide rail is provided inside the main housing, and a limiting groove matching the limiting guide rail is provided on the outer surface of the transmission nut. When the screw rotates to drive the transmission nut to reciprocate, the transmission nut eventually drives the push rod body to drive the workpiece to move to achieve angle adjustment of the product that adjusts the position. However, the existing electric linear actuator has a complex internal structure, and bearings, transmission nuts and other components need to be set in the shell, which makes assembly inconvenient and requires a large number of processing materials, resulting in high production costs. In addition, the existing electric linear actuator is usually set as an integrated structure as a whole, and the lead screw and transmission nut are set in the main shell and are difficult to disassemble. When a single electric linear actuator is damaged, it requires a lot of manpower and material resources to repair it or it is directly discarded, resulting in a considerable waste of resources.

[0003] In view of the above-mentioned prior art, it is necessary to reasonably improve the existing electric push rod structure. For this reason, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of electric push rod with a simple structure, reliability and durability, easy assembly and maintenance, which can realize the rapid and stable reciprocating motion of the screw rod to complete the angle adjustment of the product with adjustable body position, and ensure the stable movement trajectory of the screw rod by providing a slide plate that can drive the screw rod to move along the guide slide groove.

[0005] The object of the present invention is achieved in this way. A new type of electric push rod includes a driving motor; a worm gear assembly, which is transmission-connected to the driving motor, and the worm gear assembly has an outer shell; a fixed shell, the worm gear assembly is accommodated as a whole in the fixed shell, and the outer shell of the worm gear assembly can reciprocate inside the fixed shell; a screw rod passes through the fixed shell and one end of the screw rod in the length direction is fixedly connected to the external component to be adjusted, and a screw rod connecting seat is also provided at the other end of the screw rod in the length direction. The screw rod is transmission-connected to the worm gear assembly The screw rod can make reciprocating motion under the drive of the driving motor and the worm gear assembly; a slide plate, one end of which is connected to the screw rod connecting seat of the screw rod, and a guide slide groove in an arc shape and extending along its length direction is provided on the plate body of the slide plate, and a fixed shell guide rod is convexly provided on the side surface of the fixed shell facing the slide plate, and the guide slide groove is mounted on the fixed shell guide rod, and the screw rod can drive the slide plate to reciprocate on the fixed shell guide rod and realize the reciprocating motion of the screw rod itself along the moving trajectory of the guide slide groove of the slide plate.

[0006] In a specific embodiment of the present invention, the fixed housing is of a substantially kidney-shaped structure, and is provided with a plurality of fixed housing connection holes for positioning the fixed housing.

[0007] In another specific embodiment of the present invention, a rotating cavity is formed at the central position of the fixed housing and runs through the thickness direction thereof. The outer housing of the worm gear assembly is fitted in the rotating cavity and can rotate back and forth in the rotating cavity.

[0008] In another specific embodiment of the present invention, a first clearance groove I and a second clearance groove II are respectively formed on the fixed shell and on both sides corresponding to the disc-moving cavity, for the screw to pass through. The vertical lengths of the first clearance groove I and the second clearance groove II are both greater than the radial diameter of the screw. After passing through the first clearance groove I, the screw penetrates into the worm gear assembly and exits from the second clearance groove II. The screw can make reciprocating motion along its axial direction in the first clearance groove I and the second clearance groove II, and has a swinging motion perpendicular to its axial direction.

[0009] In another specific embodiment of the present invention, a connecting sleeve adapted to the shape of the guide slot is mounted on the guide rod of the fixed housing. The connecting sleeve is arranged in the guide slot and can reciprocate in the guide slot, and the rod body of the guide rod of the fixed housing protrudes outward from the connecting sleeve, and a guide rod nut is threadedly connected to a portion of the rod body of the fixed housing guide rod that protrudes from the connecting sleeve, and the guide rod nut connects the connecting sleeve and the rod body of the fixed housing guide rod together.

[0010] In another specific embodiment of the present invention, a pair of slide plate rivet holes penetrating the thickness direction of the slide plate is formed on the plate body of the slide plate close to the screw rod connecting seat, and a pair of screw rod connecting seat rivet holes are also formed on the screw rod connecting seat at positions corresponding to the pair of slide plate rivet holes, and a pad is provided between the slide plate body and the screw rod connecting seat, and a connecting rivet is provided inside each of the two slide plate rivet holes, which passes through the slide plate rivet hole and the pad in turn and then penetrates into the screw rod connecting seat rivet hole to connect the slide plate and the screw rod connecting seat together.

[0011] After the present invention adopts the above structure, it has the beneficial effect: the electric push rod adopted in the present invention can quickly realize the reciprocating motion of the screw rod in the axial direction along the motion trajectory of the guide slide groove of the slide plate through the transmission of the driving motor and the worm gear assembly, thereby efficiently and quickly completing the angle adjustment of the adjustable body position product, meeting the various riding and use needs of users. At the same time, the overall structure is simple, the number of parts is small, and the processing materials are reduced, which is convenient for assembly and maintenance, and helps to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0013] Figure 2 for Figure 1 The schematic structural diagram of the embodiment shown is from another angle.

[0014] Figure 3 for Figure 1 Exploded perspective view of the embodiment shown.

[0015] In the figure: 1. Drive motor; 2. Worm gear assembly, 21. Outer shell; 3. Stationary shell, 31. Stationary shell guide rod, 311. Connecting sleeve, 312. Guide rod nut, 32. Stationary shell connecting hole, 33. Rotating cavity, 34. First clearance groove I, 35. Second clearance groove II; 4. Screw, 41. Screw connecting seat, 411. Screw connecting seat connecting hole; 5. Slide plate, 51. Guide slide, 52. Slide plate rivet hole, 521. Connecting rivet, 53. Spacer. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solutions. Any changes in form rather than substance based on the concept of the present invention should be considered as the scope of protection of the present invention.

[0017] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and therefore cannot be understood as a special limitation on the technical solution provided by the present invention.

[0018] See Figure 1 and Figure 2 Please combine Figure 3 , shows a new type of electric push rod, including a drive motor 1; shows a worm gear assembly 2, which is transmission-connected to the aforementioned drive motor 1, the output shaft of the aforementioned drive motor 1 is inserted into the worm gear assembly 2, and the worm gear assembly 2 has an outer shell 21; shows a fixed shell 3, the aforementioned worm gear assembly 2 is accommodated in the fixed shell 3 as a whole, and the outer shell 21 of the worm gear assembly 2 can reciprocate inside the fixed shell 3; shows a screw 4, which passes through the aforementioned fixed shell 3 and one end of which is fixedly connected to the external component to be adjusted in the length direction, and a screw connecting seat 41 is also provided at the other end of the screw 4 in the length direction. The screw 4 is connected to the aforementioned worm gear assembly 2. The worm gear assembly 2 is in transmission cooperation and the screw 4 can move under the drive of the aforementioned drive motor 1 and the worm gear assembly 2; a slide plate 5 is shown, one end of which is connected to the screw connecting seat 41 of the aforementioned screw 4, and a guide slide 51 in an arc shape and extending along its length direction is also provided on the plate body of the aforementioned slide plate 5, and a fixed housing guide rod 31 is convexly provided on the side surface of the aforementioned fixed housing 3 facing the slide plate 5, and the aforementioned guide slide 51 is mounted on the fixed housing guide rod 31, and the aforementioned screw 4 can drive the slide plate 5 to reciprocate on the fixed housing guide rod 31 and realize the reciprocating motion of the screw 4 itself along the moving trajectory of the guide slide 51 of the slide plate 5.

[0019] In this embodiment, the aforementioned fixed shell 3 has a roughly kidney-shaped structure, and is also provided with a plurality of fixed shell connecting holes 32 for fixedly connecting the fixed shell 3 with components of the adjustable body position product. By inserting fasteners into the fixed shell connecting holes 32, the fixed shell 3 is fixedly placed.

[0020] Please continue to see Figures 1 to 3 The central position of the fixed housing 3 is formed with a rotating cavity 33 that runs through the thickness direction thereof. The outer housing 21 of the worm gear assembly 2 is fitted in the rotating cavity 33 and can rotate back and forth in the rotating cavity 33. Figure 1As shown, the overall appearance of the outer shell 21 is a pear-shaped structure.

[0021] Furthermore, a first clearance groove I 34 and a second clearance groove II 35 are respectively formed on the fixed housing 3 and on both sides corresponding to the aforementioned disk cavity 31 for the screw rod 4 to pass through. The vertical lengths of the first clearance groove I 34 and the second clearance groove II 35 are both greater than the radial diameter of the aforementioned screw rod 4. After passing through the first clearance groove I 34, the aforementioned screw rod 4 penetrates into the worm gear assembly 2 and passes out from the second clearance groove II 35. The screw rod 4 can reciprocate along its axial direction in the first clearance groove I 34 and the second clearance groove II 35 and also has a swinging motion perpendicular to its axial direction. Figure 1 As shown, the screw rod 4 can make a back-and-forth reciprocating motion in the first clearance groove I 34 and the second clearance groove II 35 and also have an up-and-down swinging motion.

[0022] Furthermore, a connecting sleeve 311 adapted to the shape of the aforementioned guide groove 51 is mounted on the aforementioned fixed housing guide rod 31. The connecting sleeve 311 is arranged in the aforementioned guide groove 51 and can reciprocate in the guide groove 51. The rod body of the aforementioned fixed housing guide rod 31 protrudes outward from the connecting sleeve 311, and a guide rod nut 312 is threadedly connected to a portion of the rod body of the fixed housing guide rod 31 that protrudes out of the connecting sleeve 311. The guide rod nut 312 connects the connecting sleeve 311 and the rod body of the fixed housing guide rod 31 together.

[0023] In this embodiment, a pair of slide plate rivet holes 52 are formed on the plate body of the aforementioned slide plate 5 close to the aforementioned screw connecting seat 41, and a pair of screw connecting seat rivet holes 411 are also formed on the aforementioned screw connecting seat 41 at positions corresponding to the pair of slide plate rivet holes 52. A pad 53 is also provided between the slide plate 5 plate body and the screw connecting seat 41, and a connecting rivet 521 is provided inside the two aforementioned slide plate rivet holes 52. The connecting rivet 521 passes through the slide plate rivet hole 52 and the pad 53 in sequence, and then penetrates into the screw connecting seat rivet hole 411 to connect the aforementioned slide plate 5 and the screw connecting seat 41 together.

[0024] See Figure 1 and Figure 2, briefly describe the working principle of the technical solution provided by the present invention: the electric push rod of the present technical solution is driven by the driving motor 1 and the worm gear assembly 2 to provide a power source to drive the combined screw 4 and the slide plate 5 to move. When the driving motor 1 rotates, the worm gear assembly 2 can drive the screw 4 to move in the axial direction, and because the slide plate 5 is connected to the screw connecting seat 41 of the screw 4, during the movement of the screw 4, the guide slide 51 of the slide plate 5 moves on the fixed housing guide rod 31, and the guide slide 51 is an arc groove structure. Therefore, when the screw 4 moves in the axial direction, the slide plate 5 can drive it to swing perpendicular to the axial direction, combined with Figure 2 and Figure 3 , that is, the screw rod 4 itself will reciprocate back and forth along the motion trajectory of the guide slide groove 51 of the slide plate 5. The reason for such swinging is that the connection point between the screw rod 4 and the part to be adjusted on the product is fixed. During the flipping and movement of the part to be adjusted, this connection point will also move in the vertical direction. Specifically, taking the backrest angle adjustment of an electric sofa using this electric push rod as an example, the fixed shell 3 will be fixedly connected to the bottom basin frame or the sofa frame of the electric sofa, and one end of the screw rod 4 will be connected to the sofa backrest; when the passenger needs to tilt the seat back forward to make the angle between the backrest and the horizontal seat cushion smaller to obtain a better sitting posture, the screw rod 4 will move forward as a whole through the drive motor 1, and under the guidance of the slide plate 5, the screw rod 4 will have an upward tilt swing; and when the passenger needs to tilt the sofa back backward, that is, to make the angle between the backrest and the horizontal seat cushion larger so that the passenger can lie on the sofa seat, the screw rod 4 and the slide plate 5 will move backward as a whole through the drive motor 1, and under the guidance of the slide plate 5, the screw rod 4 will have a downward swing, thereby finally achieving the adjustment of the backrest tilt angle stably and reliably.

[0025] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. A new type of electric linear actuator, characterized by: The invention comprises a driving motor (1); a worm gear assembly (2) which is transmission-connected to the driving motor (1), and the worm gear assembly (2) is provided with an outer shell (21); a fixed shell (3), the worm gear assembly (2) is entirely accommodated in the fixed shell (3), and the outer shell (21) of the worm gear assembly (2) can reciprocate inside the fixed shell (3); a screw (4) which passes through the fixed shell (3) and has one end in the longitudinal direction thereof fixedly connected to an external component to be adjusted, and a screw connecting seat ( 41), the screw (4) is in transmission cooperation with the worm gear assembly (2) and the screw (4) can make reciprocating motion under the drive of the drive motor (1) and the worm gear assembly (2); a slide plate (5), one end of which is connected to the screw connecting seat (41) of the screw (4), and a guide slide (51) in an arc shape and extending along its length direction is also provided on the plate body of the slide plate (5), and a fixed housing guide rod (31) is convexly provided on the side surface of the fixed housing (3) facing the slide plate (5), and the guide slide (51) is sleeved on the fixed housing The guide rod (31) is mounted on the guide rod (31), and the screw rod (4) can drive the slide plate (5) to reciprocate on the fixed housing guide rod (31) and realize the screw rod (4) itself to reciprocate along the moving track of the guide slide groove (51) of the slide plate (5); the fixed housing (3) is roughly kidney-shaped, and a disc-moving cavity (33) is formed at the central position of the fixed housing (3) and runs through the thickness direction thereof. The outer housing (21) of the worm gear assembly (2) is mounted in the disc-moving cavity (33) and can reciprocate in the disc-moving cavity (33); on the fixed housing (3) and corresponding to the A first clearance groove I (34) and a second clearance groove II (35) are respectively formed on both sides of the disc-moving cavity (33) for the screw rod (4) to pass through. The vertical lengths of the first clearance groove I (34) and the second clearance groove II (35) are both greater than the radial diameter of the screw rod (4). After passing through the first clearance groove I (34), the screw rod (4) penetrates into the worm gear assembly (2) and passes out from the second clearance groove II (35). The screw rod (4) can make a reciprocating motion along its axial direction in the first clearance groove I (34) and the second clearance groove II (35) and also has a swinging motion perpendicular to its axial direction.

2. A novel electric linear actuator according to claim 1, characterized in that: A plurality of fixed housing connection holes (32) for positioning the fixed housing (3) are also provided on the fixed housing (3).

3. The novel electric linear actuator according to claim 1, characterized in that: A connecting sleeve (311) adapted to the shape of the guide slot (51) is mounted on the fixed housing guide rod (31). The connecting sleeve (311) is arranged in the guide slot (51) and can reciprocate in the guide slot (51). The rod body of the fixed housing guide rod (31) protrudes outward from the connecting sleeve (311). A guide rod nut (312) is threadedly connected to a portion of the rod body of the fixed housing guide rod (31) that protrudes out from the connecting sleeve (311). The guide rod nut (312) connects the connecting sleeve (311) and the rod body of the fixed housing guide rod (31) together.

4. The novel electric linear actuator according to claim 1, characterized in that: A pair of chute plate rivet holes (52) extending through the thickness direction of the chute plate (5) is formed on the plate body of the chute plate (5) close to the screw rod connecting seat (41), and a pair of screw rod connecting seat rivet holes (411) are also formed on the screw rod connecting seat (41) at positions corresponding to the pair of chute plate rivet holes (52), and a cushion block (53) is also provided between the chute plate (5) plate body and the screw rod connecting seat (41), and a connecting rivet (521) is provided inside each of the two chute plate rivet holes (52), and the connecting rivet (521) passes through the chute plate rivet hole (52) and the cushion block (53) in sequence and then penetrates into the screw rod connecting seat rivet hole (411) to connect the chute plate (5) and the screw rod connecting seat (41) together.

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