Transmission structure of electric push rod and electric push rod

Abstract

The transmission structure of the electric push rod comprises an installation box, a motor and a shell are fixedly installed at one end of the installation box, a driving shaft of the motor extends into the installation box, a push rod assembly is arranged in the shell, the push rod assembly comprises a screw rod, a nut and a telescopic pipe, and the screw rod is connected with the nut. The screw extends into the mounting box and is rotationally connected with the mounting box, the nut is in threaded connection with the screw, the telescopic pipe is fixedly connected with the nut, the first worm is coaxially connected with the driving shaft, the first worm gear is meshed with the first worm, the second worm is fixedly connected with the first worm gear, and the second worm and the first worm gear are coaxially arranged. The device further comprises a second worm gear coaxially connected with the screw, and the second worm gear is meshed with the second worm. By means of the worm gear transmission structure, space can be saved, the installation box can be made smaller, and meanwhile noise generated by the worm gear transmission structure is small.

Description

Technical Field

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

[0002] The electric push rod is mainly composed of a motor and a retractable push rod assembly. The push rod assembly includes a screw and a telescopic rod threadedly connected to the screw. The motor drives the screw to rotate to drive the telescopic rod to move.

[0003] The driving shaft of the motor is connected with a driving gear, the screw is connected with a transmission gear, and an intermediate gear is provided between the driving gear and the transmission gear to connect the two. This structure is a common transmission structure, which has the problems of occupying a large space and having a loud transmission sound. Summary of the invention

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

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

[0006] A transmission structure of an electric push rod includes a driving shaft and a screw arranged in parallel and at intervals, a first worm coaxially connected to the driving shaft, a first worm wheel meshing with the first worm, a second worm fixedly connected to the first worm wheel, the second worm being coaxially arranged with the first worm wheel, and a second worm wheel coaxially connected to the screw, the second worm wheel meshing with the second worm.

[0007] The utility model is further configured that the centers of the first worm wheel and the second worm are provided with an axial hole penetrating the two, and a rotating shaft is connected in the axial hole.

[0008] The utility model is further configured such that the angle between the line passing through the center of the driving shaft and the screw and the central axis of the rotating shaft is an acute angle.

[0009] An electric push rod comprises an installation box, one end of which is fixedly mounted with a motor and a shell, the drive shaft of the motor extends into the installation box, a push rod assembly is arranged in the shell, the push rod assembly comprises a screw, a nut, and a telescopic tube, the screw extends into the installation box and is rotatably connected to the installation box, the nut is threadedly connected to the screw, the telescopic tube is fixedly connected to the nut, and also comprises a first worm coaxially connected to the drive shaft, a first worm wheel meshing with the first worm, a second worm fixedly connected to the first worm wheel, the second worm is coaxially arranged with the first worm wheel, and also comprises a second worm wheel coaxially connected to the screw, the second worm wheel meshing with the second worm.

[0010] The utility model is further configured that the centers of the first worm wheel and the second worm are provided with an axial hole penetrating the two, and a rotating shaft is connected in the axial hole.

[0011] The utility model is further configured such that the angle between the line passing through the center of the driving shaft and the screw and the central axis of the rotating shaft is an acute angle.

[0012] The utility model is further configured that the screw rod is connected to the installation box via a bearing.

[0013] The utility model is further configured that the other end of the installation box is opened and a cover is provided at the other end of the installation box.

[0014] The utility model is further configured that bearings are respectively arranged on the inner sides of the two ends of the installation box, and the screw rod is rotatably connected with the bearings.

[0015] The utility model is further configured that the shell is cylindrical, one end of the shell is fixedly connected to the installation box, and the other end of the shell is provided with a through hole for the telescopic tube to pass through.

[0016] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0017] The transmission structure of the electric push rod and the electric push rod provided by the utility model use two sets of worm gear structures to replace the existing gear connection structure. The existing gear connection structure, for example, is provided with three gears, two of which are respectively connected to the driving shaft and the screw of the motor, and the other gear is arranged between the two gears and meshes with the two gears. In this way, the space of the installation box needs to be able to accommodate three gears arranged side by side, and the space occupied by the gears will be relatively large. In the present application, a worm is connected to the driving shaft, a worm wheel is connected to the screw, and then a coaxial linked worm wheel and worm are arranged between the worm and the worm wheel. The coaxial linked worm wheel and worm can be arranged at an angle, which can save space and make the installation box smaller. At the same time, the noise emitted by the worm gear transmission structure will also be relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a half-section front view of the utility model.

[0021] Figure 3 For this utility model Figure 2 AA section view.

[0022] Figure 4 For this utility model Figure 2 BB cross-sectional view.

[0023] Figure 5 For this utility model Figure 2 CC cross-sectional view.

[0024] Explanation of the numbers in the accompanying drawings: drive shaft 1, screw 2, first worm 3, first worm wheel 4, second worm 5, second worm wheel 6, shaft hole 7, rotating shaft 8, mounting box 9, motor 10, housing 11, nut 12, telescopic tube 13, bearing 14, cover 15, through hole 16. DETAILED DESCRIPTION

[0025] 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.

[0026] For reference Figure 1-5 The utility model is described as follows:

[0027] Embodiment 1: An electric push rod includes a mounting box 9, one end of which is fixedly mounted with a motor 10 and a housing 11. The motor 10 is fixedly connected to the mounting box 9 by screws, and the housing 11 is a cylindrical structure with openings at both ends, and one end of the housing 11 is fixedly connected to the mounting box 9 by screws.

[0028] The drive shaft 1 of the motor 10 extends into the installation box 9 .

[0029] A push rod assembly is provided in the housing 11, and the push rod assembly includes a screw 2, a nut 12, and a telescopic tube 13. The screw 2 extends into the installation box 9 and is rotatably connected to the installation box 9. Bearings 14 are provided on the inner sides of both ends of the installation box 9 (a groove for installing the bearing 14 is provided inside the installation box 9). The screw 2 is rotatably connected to the bearing 14. The nut 12 is threadedly connected to the screw 2. The nut 12 forms a sliding fit with the inner wall of the housing 11. The telescopic tube 13 is fixedly connected to the nut 12. The telescopic tube 13, the nut 12, and the screw 2 are coaxially arranged, and the screw 2 is located on the inner side of the telescopic tube 13. A through hole 16 is provided at the other end of the housing 11 for the telescopic tube 13 to pass through. The screw 2 rotates, driving the nut 12 to slide, driving the telescopic tube 13 to telescope.

[0030] It also includes a first worm 3 coaxially connected to the drive shaft 1, a first worm wheel 4 meshing with the first worm 3, a second worm 5 fixedly connected to the first worm wheel 4, the second worm 5 is coaxially arranged with the first worm wheel 4, and a second worm wheel 6 coaxially connected to the screw 2, the second worm wheel 6 and the second worm 5 meshing, the centers of the first worm wheel 4 and the second worm 5 are provided with an axial hole 7 penetrating both, a rotating shaft 8 is connected in the axial hole 7, the rotating shaft 8 can be rotatably connected to the inner wall of the installation box 9, the first worm wheel 4 and the second worm 5 are fixedly connected to the rotating shaft 8, or the rotating shaft 8 is fixedly connected to the inner wall of the installation box 9, the first worm wheel 4 and the second worm 5 are rotatably connected to the rotating shaft 8, and the angle between the line passing through the center of the drive shaft 1 and the screw 2 and the central axis of the rotating shaft 8 is an acute angle. In the above technical solution, the drive shaft 1 drives the screw 2 to rotate through two sets of worm wheels and worm structures, and the inclined setting of the worm wheel and the worm can save space.

[0031] The other end of the installation box 9 is opened, and a cover 15 is provided on the other end of the installation box 9 .

[0032] 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. A transmission structure of an electric push rod, comprising a drive shaft (1) and a screw (2) arranged in parallel and at intervals, characterized in that: The invention also comprises a first worm (3) coaxially connected to the drive shaft (1), a first worm wheel (4) meshing with the first worm (3), a second worm (5) fixedly connected to the first worm wheel (4), the second worm (5) being coaxially arranged with the first worm wheel (4), and a second worm wheel (6) coaxially connected to the screw (2), the second worm wheel (6) meshing with the second worm (5); the centers of the first worm wheel (4) and the second worm (5) are provided with an axial hole (7) penetrating the first worm wheel (4) and the second worm (5), the axial hole (7) being connected with a rotating shaft (8); and the angle between a line passing through the centers of the drive shaft (1) and the screw (2) and the central axis of the rotating shaft (8) is an acute angle.

2. An electric push rod, comprising a mounting box (9), one end of which is fixedly mounted with a motor (10) and a housing (11), a drive shaft (1) of the motor (10) extending into the mounting box (9), a push rod assembly being arranged in the housing (11), the push rod assembly comprising a screw rod (2), a nut (12), and a telescopic tube (13), the screw rod (2) extending into the mounting box (9) and being rotatably connected to the mounting box (9), the nut (12) being threadedly connected to the screw rod (2), and the telescopic tube (13) being fixedly connected to the nut (12), characterized in that: It also includes a first worm (3) coaxially connected to the drive shaft (1), a first worm wheel (4) meshing with the first worm (3), a second worm (5) fixedly connected to the first worm wheel (4), the second worm (5) being coaxially arranged with the first worm wheel (4), and a second worm wheel (6) coaxially connected to the screw (2), the second worm wheel (6) meshing with the second worm (5).

3. The electric push rod according to claim 2, characterized in that: An axial hole (7) penetrating the first worm wheel (4) and the second worm (5) is provided at the center of the two, and a rotating shaft (8) is connected to the axial hole (7).

4. The electric push rod according to claim 3, characterized in that: The angle between a line passing through the center of the drive shaft (1) and the screw (2) and the central axis of the rotating shaft (8) is an acute angle.

5. The electric push rod according to claim 2, characterized in that: The screw rod (2) is connected to the mounting box (9) via a bearing (14).

6. The electric push rod according to claim 2, characterized in that: The other end of the installation box (9) is open, and a cover body (15) is provided at the other end of the installation box (9).

7. The electric linear actuator according to claim 5, characterized in that: Bearings (14) are respectively provided on the inner sides of both ends of the installation box (9), and the screw rod (2) is rotatably connected to the bearings (14).

8. The electric linear actuator according to claim 2, characterized in that: The housing (11) is cylindrical, one end of the housing (11) is fixedly connected to the installation box (9), and the other end of the housing (11) is provided with a through hole (16) for the telescopic tube (13) to pass through.

Images