Electric push rod

Abstract

The utility model discloses an electric push rod, which comprises a motor, a screw rod and a variable transmission unit connected between the motor and the screw rod, the outer pipe is connected to the box body of the variable speed transmission unit; the inner pipe is assembled in the outer pipe and is driven by the rotating motion of the lead screw to stretch out and draw back relative to the outer pipe; the tail puller is arranged on the side, back on to the outer pipe, of the variable transmission unit; the front puller is connected to the end part of the inner pipe; the carrier connecting piece comprises a base and a connecting body which are connected with each other, and the connecting body is provided with a connecting shaft and / or a connecting hole used for attaching and installing a carrier; the base is connected to the outer pipe; wherein at least one of the tail puller and the carrier connecting piece is matched with the front puller to connect the electric push rod to the mounting carrier. The front puller can be used in cooperation with the rear puller and can also be used in cooperation with the carrier connecting piece, in addition, the front puller, the rear puller and the carrier connecting piece can be used in cooperation, and the application range of products is greatly widened.

Description

Technical Field

[0001] The utility model relates to the field of electric push rods, and more particularly to an electric push rod. Background Art

[0002] Electric push rods are widely used in furniture, medical equipment, solar power generation and other fields. Its main structure includes a motor, an intermediate transmission mechanism, a lead screw, an inner tube and an outer tube. The working principle is that the motor starts and drives the lead screw to rotate through the intermediate transmission mechanism, and the lead screw drives the inner tube to expand and contract within the outer tube.

[0003] In the existing linear actuators on the market, generally a front pull is installed at the extended end of the inner tube, and some also install a tail pull at one end of the electric push rod far from the front pull. The existence of the front pull and the tail pull adapts to most usage scenarios, but cannot meet the diverse installation requirements of the electric push rod. Summary of the Utility Model

[0004] In order to overcome the deficiencies in the prior art, the utility model provides an electric push rod with the advantage of a wide range of applications.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] An electric push rod includes a motor, a lead screw, and a variable speed transmission unit connected between the two; an outer tube connected to the housing of the variable speed transmission unit; an inner tube assembled in the outer tube and driven by the rotational movement of the lead screw to expand and contract relative to the outer tube; a tail pull provided on a side of the variable speed transmission unit facing away from the outer tube; a front pull connected to an end of the inner tube; a carrier connecting member including a base and a connecting body connected to each other, the connecting body having a connecting shaft and / or a connecting hole for attaching to an installation carrier; the base is connected to the outer tube; wherein at least one of the tail pull and the carrier connecting member cooperates with the front pull to connect the electric push rod to the installation carrier.

[0007] By adopting the above technical solutions, either the front pull and the tail pull can be used in combination, or the front pull and the carrier connecting member can be used in combination. In addition, the front pull, the tail pull and the carrier connecting member can also be used in combination, which greatly improves the scope of application of the product; in addition, the connecting body uses the base to connect to the outer tube, and the base increases the force-bearing area of the installation carrier acting on the outer tube, thereby improving the connection strength between the installation carrier and the outer tube.

[0008] Optionally, the base is connected to an end of the outer tube close to the front pull.

[0009] By adopting the above technical solutions, the base is installed at the end of the outer cylinder close to the front pull, so that the outer cylinder does not need to be modified.

[0010] Optionally, the base includes an integrally formed cover plate and a sleeve; the cover plate closes the outer tube and is freely penetrated by the inner tube; the sleeve is sleeved on the outer tube.

[0011] By adopting the above technical solution, the base replaces the original front cover plate, so there is no need to change the outer cylinder. In addition, when the base is installed, the installation of the connecting piece and the closing of the outer tube are realized at the same time.

[0012] Optionally, the base and the connecting shaft are integrally formed.

[0013] By adopting the above technical solution, the base and the connecting body are integrally formed. In this way, the installation of the connecting body is completed while the installation of the base is completed, which is more convenient to operate. At the same time, the connection strength between the connecting body and the base is greater.

[0014] Optionally, the base and the outer tube form an axially sliding connection; the carrier connecting piece further includes a locking piece for fixing the base on the outer tube.

[0015] By adopting the above technical solution, the base and the outer tube are axially slidably connected and fixed by the locking piece. In this way, the position of the base can be adjusted, the adaptability is improved, and the applicable range of the product is further increased.

[0016] Optionally, the base has a radially penetrating threaded hole; the connecting shaft is used as the locking piece to cooperate with the threaded hole.

[0017] By adopting the above technical solution, the base is locked by the connecting piece, the fixing of the base is completed, and the connection of the connecting piece is also completed. It serves two purposes and is convenient to operate.

[0018] Optionally, the base is formed by circumferentially splicing at least two components.

[0019] By adopting the above technical solution, the base is divided into a plurality of components distributed circumferentially, which is convenient for disassembly and assembly with the outer tube.

[0020] Optionally, a thickened portion is locally protruded on the outer side wall of the base; the connecting body is arranged on the thickened portion.

[0021] By adopting the above technical solution, the thickened portion is used for the connecting body, thereby improving the connection stability of the connecting body.

[0022] Optionally, the thickened portion is integrally formed or separately arranged.

[0023] By adopting the above technical solution, the integrally formed thickened portion is beneficial to increasing its strength; the separately arranged thickened portion is convenient for subsequent replacement of the thickened portion and improves the overall service life.

[0024] Optionally, the base is integrally formed with the outer tube; the base extends along the axial direction of the outer tube and protrudes from the outer side surface of the outer tube.

[0025] By adopting the above technical solution, the base protrudes along the axial direction of the outer tube, increasing the load-bearing area of the outer tube. At the same time, the protruding base provides sufficient installation space for the connecting piece, avoiding interference with the inner tube during the subsequent installation of the connecting shaft. In addition, the installation range of the connecting shaft is larger.

[0026] In summary, the beneficial effects of the present utility model are as follows:

[0027] 1. The front pull can be used in cooperation with the rear pull, or in cooperation with the carrier connecting piece, or all three can be used in cooperation at the same time, greatly improving the application range of the product.

[0028] 2. The position of the base can be adjusted, improving the adaptability and further increasing the application range of the product. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of one of the usage scenarios of the present utility model.

[0030] Figure 2 is a schematic structural diagram of Embodiment 1 of the present utility model.

[0031] Figure 3 is of the present utility model Figure 2 partial enlarged schematic structural diagram.

[0032] Figure 4 is a schematic structural diagram of Embodiment 2 of the present utility model.

[0033] Figure 5 is of the present utility model Figure 4 partial enlarged schematic structural diagram.

[0034] Figure 6 is a schematic structural diagram of Embodiment 3 of the present utility model.

[0035] Figure 7 is a schematic structural diagram of Embodiment 4 of the present utility model.

[0036] Description of the Reference Numerals:

[0037] 10. Outer cylinder; 11. Variable speed transmission unit; 12. Motor;

[0038] 20. Front pull;

[0039] 30. Tail pull;

[0040] 40. Carrier connecting piece;

[0041] 50. Base; 51. Cover plate; 52. Sleeve; 53. Thickened part;

[0042] 60. Connecting shaft. Detailed implementation mode

[0043] The following will further elaborate on the present utility model in conjunction with the attached Figure 1-7 drawings.

[0044] Embodiment 1: Disclose an electric push rod. Refer to Figure 2 and Figure 3 , there are a motor 12, a speed change transmission unit 11, a lead screw, an inner tube and an outer tube 10; the motor 12 is connected to the lead screw through the speed change transmission unit 11; the speed change transmission unit 11 plays a role in decelerating; the outer tube 10 is fixed on the casing of the speed change transmission unit 11; the inner tube is telescopically arranged inside the outer tube 10; during operation, the motor 12 drives the lead screw to rotate through the speed change transmission unit 11, and the lead screw drives the inner tube to axially move inside the outer tube 10 so as to drive the inner tube to telescopically move inside the outer tube 10.

[0045] Refer to Figure 2 and Figure 3 , a front pull 20 is installed at the extended end of the inner tube, and a tail pull 30 is installed at one end of the speed change transmission unit 11 away from the outer tube 10; a carrier connecting piece 40 is connected to the end of the outer tube 10; refer to Figure 1 , the installation carrier is connected to the electric push rod through the tail pull 30, the front pull 20 and the carrier connecting piece 40; the carrier connecting piece 40 is used to support the electric push rod.

[0046] Refer to Figure 2 and Figure 3 , the carrier connecting piece 40 includes a base 50 and a connecting body; the base 50 is connected to the outer tube 10; the connecting body is used to connect the installation carrier, and the connecting body can be a connecting hole formed on the base 50 or a connecting shaft 60 connected to the base 50. Additionally, the connecting body can also be a connecting hole and a connecting shaft 60, so that the subsequent connection methods of the installation carrier are diverse. When the connecting body is the connecting shaft 60, the connecting shaft 60 is integrally formed with the base 50.

[0047] The original outer tube 10 did not consider the adaptability with the connecting body. For example, when using welding or threaded connection, the connecting body is not suitable for directly fixing on the outer tube. Now, the base 50 is set to connect the outer tube 10 and the connecting body, without the need to adapt by changing the outer tube 10, greatly saving the design and manufacturing costs.

[0048] Refer to Figure 2 and Figure 3, the base 50 is integrally formed by means of sheet metal stamping, casting, etc. Since sheet metal stamping has requirements for material thickness, among sheet metal stamping and casting, casting is preferred. When casting, the base 50 and the connecting shaft 60 can be integrally cast, so that the strength of the entire carrier connecting member 40 is greater.

[0049] Reference Figure 2 and Figure 3 , the base 50 includes a cover plate 51 and a sleeve 52; the cover plate 51 closes the end of the outer tube; the sleeve 52 circumferentially surrounds the end of the outer tube 10. When the base 50 is installed, there is no need to install the original front cover plate. The base 50 is sleeved on the outer tube 10 and then fixed with screws, so that the installation of the cover plate 51 and the sleeve 52 is completed at one time, saving the assembly process. At this time, the cover plate 51 of the base 50 closes the outer tube 10, the inner tube freely penetrates through the cover plate 51 of the base 50, the sleeve 52 of the base 50 is sleeved on the outer tube 10 and the inner wall surface of the sleeve 52 fits the outer surface of the outer tube 10. In addition, the base 50 can also be directly welded to the outer tube 10 without using screws for fixation. The stress area of the outer tube 10 changes from the area between the connection hole or the connecting shaft 60 and the outer tube 10 to the contact area between the inner surface of the base 50 and the outer surface of the outer tube 10, which greatly increases the stress area of the outer tube 10, thereby improving the connection strength between the installation carrier and the outer tube 10. In addition, there is a sealing design between the original front cover plate and the end of the outer tube 10. The base 50 is provided with a sleeve 52 whose inner wall surface fits the outer surface of the outer tube 10, so that the sealing area is increased and the sealing effect is better. Especially when the base 50 is welded and fixed to the outer tube 10, the original sealing structure can even be omitted.

[0050] The base 50 can also be designed in an L shape. The horizontal part of the base 50 is the cover plate 51, the vertical part is closely attached to the outer side wall of the outer tube 10, and the horizontal part of the base 50 is connected to the end of the outer tube 10 by screws; the vertical part of the base 50 is welded to the outer tube 10, so that the stress area of the outer tube 10 is also larger than the stress area of the outer tube 10 when the connecting body is directly arranged on the outer tube 10. The base 50 is not limited to the above structure, and any structure that can increase the stress area of the outer tube 10 is acceptable.

[0051] Embodiment 2: The difference between Embodiment 2 and Embodiment 1 lies in: Reference Figure 4 and Figure 5 , the base 50 integrally formed by casting has a thickened part 53; a connection hole is machined on the thickened part 53. When the connecting shaft 60 needs to be installed, the connecting shaft 60 is installed in the connection hole by means of thread or interference fit, etc., so that the conditions of the base 50 itself, such as the wall thickness of the base 50, etc., do not need to be considered too much. In addition, for the convenience of machining and subsequent maintenance of parts, the thickened part 53 can be an independent part and is fixedly connected to the base 50 by welding.

[0052] Reference Figure 4 andFigure 5 , the thickening part 53 is only provided at the positions where the connecting member needs to be set. However, the thickening part 53 can also be provided on the outer surface of the base 50 and all the thickening parts 53 are connected together, which can greatly increase the overall strength of the base 50.

[0053] Embodiment 3: The difference between Embodiment 3 and Embodiment 2 is: Refer to Figure 6 , the base 50 is not fixed at the end of the outer tube 10 close to the front pull 20, and the base 50 can be set at any position on the axial direction of the outer tube 10.

[0054] Refer to Figure 6 , the base 50 is provided with a hole for fitting with the outer tube 10; the base 50 is slidably arranged on the outer tube 10 through this hole and the inner side wall of this hole is in contact with the outer side surface of the outer tube 10; when fixing, the base 50 is locked on the outer tube 10 through fasteners such as screws; when the fastener is locked, the end of the fastener abuts against the outer side surface of the outer tube 10 for limiting, and a limiting block can also be radially slidably arranged inside the base 50, and the limiting block is driven by the fastener to abut against the outer side surface of the outer tube 10. Of course, it is not limited to the above method, as long as there is a mechanism on the base 50 that can apply radial pressure to the outer side surface of the outer tube 10 to increase the friction force. The connection points required for different installation carriers are also different, and the base 50 can be unlocked by the fastener, so as to move the base 50 to a suitable position, so that the electric push rod has stronger adaptability and a wider application range.

[0055] In addition, the base 50 is formed by circumferentially splicing multiple components, such as two hoop fasteners connected by bolts, and the two hoop fasteners are tightened on the outer tube 10 by bolts.

[0056] Refer to Figure 6 , in order to reduce the use of locking parts such as screws, the connecting shaft 60 can be used as a screw; the specific method is as follows: a threaded hole is machined on the base 50 as a connection hole, the threaded hole is radially penetrated, the connecting shaft 60 is machined with an external thread matching the threaded hole, and the connecting shaft 60 is screwed into the threaded hole; when locking, the inner end of the connecting shaft 60 abuts against the outer side wall of the outer tube 10 to complete the limiting of the base 50 and the outer tube 10 and the connection between the connecting shaft 60 and the base 50.

[0057] Of course, considering that the applicable scenario is generally fixed after installation, the base 50 can also be directly welded to the outer tube 10 after moving to a suitable position.

[0058] Embodiment 4: The difference between Embodiment 4 and Embodiment 1 is: Refer to Figure 7, the base 50 is integrally formed with the outer tube 10; the base 50 extends along the axial direction of the outer tube and protrudes from the outer side surface of the outer tube; the existing outer tube 10 is a square tube or a round tube, and the protruding base 50 is equivalent to forming a reinforcing rib on the outer tube 10, thereby improving the strength of the outer tube 10. At the same time, the protruding base 50 itself also has greater strength than other positions of the outer tube 10. In addition, when the connecting member is provided on the base 50, compared with the connecting member directly provided on the existing outer tube 10 of the square tube or the round tube, the force-bearing area of the outer tube 10 changes from the area between the connecting hole or the connecting shaft 60 and the outer tube 10 to the connecting surface between the base 50 and the outer tube 10, which greatly increases the force-bearing area of the outer tube 10, thereby improving the connection strength between the installation carrier and the outer tube 10. At the same time, the protruding base 50 provides sufficient installation space for the connecting member, avoiding interference between the subsequent connecting shaft and the inner tube inside the outer tube 10, which affects the normal operation and service life of the electric push rod.

[0059] A connecting hole is formed in the base 50; the connecting shaft 60 is installed in the connecting hole of the base 50 by interference fit; of course, the connecting shaft 60 can also be threadedly connected or directly welded to the base 50; the base 50 and the outer tube 10 have the same length, so that the installation range of the connecting member is wider, and at the same time, the force-bearing area of the outer tube 10 is relatively larger. In addition, when the base 50 and the outer tube 10 are integrally formed by stretching, the processing is more convenient.

[0060] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An electric push rod, characterized in that: Comprising a motor (12), a lead screw, and a variable speed transmission unit (11) connected between the two; an outer tube (10), connected to the housing of the variable speed transmission unit (11); an inner tube, assembled in the outer tube (10) and driven by the rotational movement of the lead screw to telescopically move relative to the outer tube (10); a tail pull (30), provided on a side of the variable speed transmission unit (11) facing away from the outer tube (10); a front pull (20), connected to an end of the inner tube; a carrier connecting member (40), including a base (50) and a connecting body connected to each other, the connecting body having a connecting shaft (60) and / or a connecting hole for attaching and mounting a carrier; the base (50) is connected to the outer tube (10); wherein at least one of the tail pull (30) and the carrier connecting member (40) cooperates with the front pull (20) to connect the electric push rod to the mounting carrier.

2. The electric push rod according to claim 1, wherein: The base (50) is connected to an end of the outer tube (10) close to the front pull (20).

3. An electric push rod according to claim 2, characterized in that: The base (50) includes an integrally formed cover plate (51) and a sleeve (52); the cover plate (51) closes the outer tube (10) and is freely penetrated by the inner tube; the sleeve (52) is sleeved on the outer tube (10).

4. An electric push rod according to claim 2, characterized in that: The base (50) and the connecting shaft (60) are integrally formed.

5. An electric push rod according to claim 1, characterized in that: The base (50) and the outer tube (10) form an axially sliding connection; the carrier connecting member (40) further includes a locking member for fixing the base (50) on the outer tube (10).

6. An electric push rod according to claim 5, characterized in that: The base (50) has a radially penetrating threaded hole; the connecting shaft (60) cooperates with the threaded hole as the locking member.

7. An electric push rod according to claim 5, characterized in that: The base (50) is formed by circumferentially splicing at least two components.

8. An electric push rod according to claim 1, characterized in that: A locally protruding thickened portion (53) is formed on an outer side wall of the base (50); the connecting body is provided on the thickened portion (53).

9. The electric push rod according to claim 8, characterized in that: The thickened portion (53) is integrally formed or separately provided.

10. An electric push rod according to claim 1, characterized in that: The base (50) and the outer tube (10) are integrally formed; the base (50) extends along the axial direction of the outer tube and protrudes from an outer side surface of the outer tube.

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