Electric push rod

Abstract

The electric push rod comprises a shell, a push rod assembly and a motor, the shell is of a tubular structure with the two ends open, an annular fixing groove is formed in the inner side wall of the shell, a clamping spring is connected into the fixing groove, a shaft sleeve, the motor, a spring and a rear cover are sequentially arranged on the rear side of the clamping spring, a rotatable screw rod is connected to the shaft sleeve, and the screw rod is connected with the push rod assembly. The screw penetrates through the clamping spring to extend forwards, a nut is connected to the screw and located on the front side of the clamping spring, a telescopic pipe is connected to the nut, and the screw is connected with a driving shaft of the motor through a coupler. The shaft sleeve and the motor in the shell are limited and fixed between the snap spring and the rear cover, and the spring is arranged between the motor and the rear cover, so that under the elastic force action of the spring, possible gaps can be eliminated, and the problems that components in the shell move and generate abnormal sound are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric push rods, in particular to an electric push rod. Background Art

[0002] like Figure 1 As shown, an existing electric push rod is a long rod-shaped structure, in which a motor and a push rod assembly driven by the motor are arranged.

[0003] Generally, the motor is set at the rear end and the push rod assembly is set at the front end, and the components are installed in a straight line. Due to the manufacturing errors of the parts and the need to reserve installation space, there is a problem of gaps between the components on the installation line. In this way, when the push rod is working, its internal components will move, produce abnormal noise, and affect the use of the push rod. Summary of the invention

[0004] In view of the problems pointed out in the background technology, the utility model proposes an electric push rod to solve the above technical problems.

[0005] The technical solution of the utility model is achieved in this way:

[0006] An electric push rod comprises a shell, a push rod assembly, and a motor. The shell is a tubular structure with openings at both ends. An annular fixing groove is provided on the inner wall of the shell, and a retaining spring is connected in the fixing groove. A shaft sleeve, a motor, a spring, and a rear cover are sequentially provided on the rear side of the retaining spring. A rotatable screw is connected to the shaft sleeve, and the screw extends forward through the retaining spring. A nut is connected to the screw, and the nut is located on the front side of the retaining spring. A telescopic tube is connected to the nut. The screw and the driving shaft of the motor are connected by a coupling.

[0007] The utility model is further configured such that a positioning ring is fixedly connected to the end face of the motor facing the shaft sleeve, a protruding positioning block is provided on the outer side face of the positioning ring, a connecting groove connected to the positioning block is provided on the inner side wall of the shell, and the connecting groove extends along the length direction of the shell and passes through both ends of the shell.

[0008] The utility model is further configured that the coupling is located on the inner side of the shaft sleeve.

[0009] The utility model is further configured that a front cover is provided at the front end of the shell, and a hole for the telescopic tube to pass through is provided on the front cover.

[0010] The utility model is further configured that a limiting sleeve is provided on the inner side of the front cover, and the telescopic tube passes through the limiting sleeve.

[0011] The utility model is further configured that a protruding sliding portion is provided on the outer side surface of the nut, and the sliding portion is slidably matched with the connecting groove.

[0012] The utility model is further configured that a spring seat is provided between the motor and the rear cover, the spring seat abuts against the motor, and the spring is provided between the spring seat and the rear cover.

[0013] The utility model is further configured that a protruding positioning portion is provided on the outer side surface of the clamping spring, the positioning portion is arranged in the middle of the clamping spring, and a positioning groove matched with the positioning portion is provided on the inner side wall of the shell.

[0014] By adopting the above technical solution, the positioning groove can guide the retaining spring to be installed into the fixed groove in the shell. When the retaining spring enters the fixed groove, the two ends of the retaining spring are squeezed to move towards each other until the retaining spring moves to the position of the fixed groove. The retaining spring enters the fixed groove, and the two ends of the retaining spring restore their deformation. The inner diameter of the retaining spring is smaller than the inner diameter of the shell, and the depth of the positioning groove is greater than the depth of the fixed groove. In this way, when the retaining spring enters the fixed groove, the positioning part is still connected to the positioning groove, which can prevent the retaining spring from rotating.

[0015] The utility model is further configured that two threaded holes connected to the fixing groove are provided on the side wall of the shell, the two threaded holes are symmetrically arranged with respect to the positioning groove, and the threaded holes are correspondingly arranged with the two ends of the retaining spring.

[0016] By adopting the above technical solution, the retaining ring can be disassembled. When the retaining ring needs to be disassembled, a screw can be screwed into the threaded hole, the screw squeezes the retaining ring out of the fixing groove, and then a tool is used to pull the retaining ring out of the housing.

[0017] The utility model is further configured that the front cover and the rear cover are respectively provided with hinge holes.

[0018] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0019] The electric push rod provided by the utility model has a shaft sleeve and a motor in a housing that are restricted and fixed between a retaining spring and a rear cover, and a spring is arranged between the motor and the rear cover, so that under the elastic force of the spring, possible gaps can be eliminated, thereby avoiding the problem of movement of components in the housing and generation of abnormal noises. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of an existing electric push rod.

[0022] Figure 2 It is a cross-sectional view of the utility model.

[0023] Figure 3 It is a partial cross-sectional view of the utility model.

[0024] Figure 4 The utility model is shown in FIG. Figure 1 .

[0025] Figure 5 The utility model is shown in FIG. Figure 2 .

[0026] Figure 6 It is a structural schematic diagram of the connection between the clamping spring and the housing of the utility model.

[0027] Figure 7 It is a structural schematic diagram of the retaining spring of the utility model.

[0028] Explanation of the numbers in the accompanying drawings: housing 1, motor 2, fixing groove 3, retaining ring 4, sleeve 5, spring 6, rear cover 7, screw 8, nut 9, telescopic tube 10, coupling 11, positioning ring 12, positioning block 13, connecting groove 14, front cover 15, limiting sleeve 16, sliding part 17, spring seat 18, positioning part 19, positioning groove 20, threaded hole 21, hinge hole 22. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] For reference Figure 1-7 The utility model is described as follows:

[0031] Embodiment 1: An electric push rod comprises a housing 1, a push rod assembly, and a motor 2. The housing 1 is a long tubular structure with openings at both ends. An annular fixing groove 3 is provided on the inner wall of the housing 1. A retaining spring 4 is connected in the fixing groove 3. A shaft sleeve 5, a motor 2, a spring 6, and a rear cover 7 are provided on the rear side of the retaining spring 4 in sequence. The rear cover 7 is fixedly connected to the end of the housing 1. In the above technical solution, the shaft sleeve 5, the motor 2, and the spring 6 are restricted and fixed between the retaining spring 4 and the rear cover 7, and a spring 6 is provided therebetween (a spring seat 18 is provided between the motor 2 and the rear cover 7, the spring seat 18 abuts against the motor 2, and the spring 6 is provided between the spring seat 18 and the rear cover 7) to eliminate the gap that may exist on the connecting straight line, so that the equipment connection is more compact, stable, and firm.

[0032] A rotatable screw rod 8 is connected to the sleeve 5, and the screw rod 8 is rotatably connected to the sleeve 5 through a bearing. The screw rod 8 extends forward through the retaining spring 4. The screw rod 8 is connected to a nut 9, and the nut 9 is located on the front side of the retaining spring 4. The nut 9 is connected to a telescopic tube 10, and the screw rod 8 is located on the inner side of the telescopic tube 10. The screw rod 8 and the driving shaft of the motor 2 are connected through a coupling 11, and the coupling 11 is located on the inner side of the sleeve 5. The motor 2 drives the screw rod 8 to rotate, and the rotation of the screw rod 8 drives the nut 9 to move (a protruding sliding portion 17 is provided on the outer surface of the nut 9, and the sliding portion 17 is slidably matched with the connecting groove 14, so that the circumferential rotation of the nut 9 can be limited), and the nut 9 drives the telescopic tube 10 to move, so that the telescopic movement of the telescopic tube 10 is realized. A front cover 15 is provided at the front end of the housing 1, and a hole is provided on the front cover 15 for the telescopic tube 10 to pass through. A limiting sleeve 16 is provided on the inner side of the front cover 15 , and the telescopic tube 10 passes through the limiting sleeve 16 . The limiting sleeve 16 can limit the extreme position of the forward movement of the nut 9 , and the backward movement of the nut 9 is limited by the retaining spring 4 .

[0033] The front cover 15 and the rear cover 7 are respectively provided with hinge holes 22 for realizing hinge connection between the two ends of the electric push rod and other components.

[0034] A positioning ring 12 is fixedly connected to the end face of the motor 2 facing the shaft sleeve 5. The positioning ring 12 is fixedly connected to the motor 2 by screws. A protruding positioning block 13 is provided on the outer side face of the positioning ring 12. A connecting groove 14 connected to the positioning block 13 is provided on the inner side wall of the shell 1. The connecting groove 14 extends along the length direction of the shell 1 and passes through both ends of the shell 1. The positioning block 13 cooperates with the connecting groove 14 to limit the circumferential rotation of the positioning ring 12 and the motor 2.

[0035] A wire inlet hole is provided on the side wall at the rear end of the housing 1, and wires for supplying power to the motor pass through the wire inlet hole.

[0036] In order to realize the detachability of the clamping spring 4, the following technical solution is provided:

[0037] A protruding positioning portion 19 is provided on the outer surface of the clamping spring 4, and the positioning portion 19 is arranged in the middle of the clamping spring 4. A positioning groove 20 that cooperates with the positioning portion 19 is provided on the inner side wall of the housing 1. The positioning portion 19 cooperates with the positioning groove 20 to fix the position of the clamping spring 4, so that the clamping spring 4 inserted into the fixing groove 3 is in a fixed position. Two threaded holes 21 that are connected to the fixing groove 3 are provided on the side wall of the housing 1. The two threaded holes 21 are symmetrically arranged about the positioning groove 20, and the threaded holes 21 are arranged correspondingly to the two ends of the clamping spring 4. With this technical solution, the clamping spring 4 can be pushed out of the fixing groove 3 by using a screw to enter the threaded hole 21, so that the clamping spring 4 can be pulled out of the housing 1 with a tool to complete the disassembly of the clamping spring 4.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric push rod, comprising a housing (1), a push rod assembly, and a motor (2). Features: The housing (1) is a tubular structure with two ends open. An annular fixing groove (3) is provided on the inner side wall of the housing (1). A retaining spring (4) is connected in the fixing groove (3). A shaft sleeve (5), a motor (2), a spring (6), and a rear cover (7) are provided in sequence on the rear side of the retaining spring (4). A rotatable screw (8) is connected to the shaft sleeve (5). The screw (8) passes through the retaining spring (4) and extends forward. A nut (9) is connected to the screw (8). The nut (9) is located on the front side of the retaining spring (4). A telescopic tube (10) is connected to the nut (9). The screw (8) and the drive shaft of the motor (2) are connected via a coupling (11).

2. The electric push rod according to claim 1, Features: A positioning ring (12) is fixedly connected to the end surface of the motor (2) facing the shaft sleeve (5), a protruding positioning block (13) is provided on the outer side surface of the positioning ring (12), and a connecting groove (14) connected to the positioning block (13) is provided on the inner side wall of the housing (1), and the connecting groove (14) extends along the length direction of the housing (1) and passes through both ends of the housing (1).

3. The electric push rod according to claim 1, Features: The coupling (11) is located on the inner side of the shaft sleeve (5).

4. The electric push rod according to claim 1, Features: The front end of the housing (1) is provided with a front cover (15), and the front cover (15) is provided with a hole for the telescopic tube (10) to pass through.

5. The electric push rod according to claim 4, Features: A limiting sleeve (16) is provided on the inner side of the front cover (15), and the telescopic tube (10) passes through the limiting sleeve (16).

6. The electric push rod according to claim 2, Features: A protruding sliding portion (17) is provided on the outer side surface of the nut (9), and the sliding portion (17) is slidably matched with the connecting groove (14).

7. The electric push rod according to claim 1, Features: A spring seat (18) is provided between the motor (2) and the rear cover (7), the spring seat (18) abuts against the motor (2), and the spring (6) is provided between the spring seat (18) and the rear cover (7).

8. The electric linear actuator according to claim 1, Features: A protruding positioning portion (19) is provided on the outer surface of the retaining spring (4), the positioning portion (19) is arranged in the middle of the retaining spring (4), and a positioning groove (20) cooperating with the positioning portion (19) is provided on the inner wall of the housing (1).

9. The electric push rod according to claim 8, Features: The side wall of the housing (1) is provided with two threaded holes (21) connected to the fixing groove (3); the two threaded holes (21) are symmetrically arranged with respect to the positioning groove (20); and the threaded holes (21) are arranged correspondingly to the two ends of the retaining spring (4).

10. The electric push rod according to claim 4, Features: The front cover (15) and the rear cover (7) are respectively provided with hinge holes (22).

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