Bidirectional synchronous electric push rod

Abstract

The present application belongs to the field of electric actuating execution mechanism, and specifically discloses a bidirectional synchronous electric push rod, which comprises a gear box, a gear box cover, a sleeve ball nut, a left-rotating ball screw, a right-rotating ball screw and a bearing seat, characterized in that the right end of the sleeve ball nut is provided with the left-rotating ball nut, the left end is provided with the right-rotating ball nut, the left-rotating ball screw and the right end left-rotating ball nut form a ball screw pair, and the right-rotating ball screw and the left end right-rotating ball nut form a ball screw pair. The bidirectional synchronous electric push rod of the present application replaces the functions of two one-way push rods with one bidirectional push rod, saves installation space and reduces cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric actuating execution mechanism, and particularly relates to an execution mechanism requiring bidirectional movement. BACKGROUND

[0002] Current electric push rods are all unidirectional push rods, and in some mechanisms such as bidirectional opening and closing electric doors or mechanisms requiring bidirectional symmetrical movement, two sets of electric push rods are required for bidirectional execution. SUMMARY

[0003] The present application aims to provide a bidirectional synchronous electric push rod, which replaces the functions of two unidirectional push rods with one bidirectional push rod, saves installation space and reduces cost.

[0004] The technical solution of the present application is a bidirectional synchronous electric push rod, comprising a gear box, a gear box cover, a sleeve ball nut, a left-hand ball screw, a right-hand ball screw and a bearing seat, characterized in that the sleeve ball nut is provided with a left-hand ball nut at the right end and a right-hand ball nut at the left end, the left-hand ball screw and the right-end left-hand ball nut form a ball screw pair, and the right-hand ball screw and the left-end right-hand ball nut form a ball screw pair.

[0005] The diameter of the left-hand ball screw is greater than that of the right-hand ball screw, and a long hole is formed in the center of the left-hand ball screw, and when the left-hand and right-hand ball screws at both ends are closed, the right-hand ball screw can enter the long hole in the center of the left-hand ball screw.

[0006] The sleeve ball nut is provided with support bearings at both ends of the outer diameter, a spacer is arranged between the two support bearings, the outer rings of the two support bearings are mounted on the bearing seat, and the inner and outer rings of the left-end support bearing are fixed by a bearing baffle and a bearing pressure cover, respectively.

[0007] Long guide key grooves are respectively machined on the outer diameters of the left-hand ball screw and the right-hand ball screw.

[0008] Further, a first guide key is arranged on the gear box cover and cooperates with the long guide key groove on the outer diameter of the left-hand ball screw to limit the rotation of the left-hand ball screw, so that the left-hand ball screw can only move linearly forward and backward.

[0009] Further, a second guide key is arranged on the bearing pressure cover and cooperates with the long guide key groove on the outer diameter of the right-hand ball screw to limit the rotation of the right-hand ball screw, so that the right-hand ball screw can only move linearly forward and backward.

[0010] The present application has the following beneficial effects:

[0011] The application is driven by a servo motor, which rotates a sleeve ball nut with left and right rotating ball nuts, so that two ends of the sleeve ball nut are synchronously expanded and contracted, and the function of replacing two one-way push rods with one bidirectional push rod is realized, which has the characteristics of fast extension and retraction speed, high position accuracy, saving installation space, cost saving, economy, practicality, safety and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic diagram of a bidirectional synchronous electric push rod structure.

[0013] Explanation of reference numerals: servo motor 1; speed reducer 2; gear box 3; gear box cover 4; driving gear 5; driven gear 6; sleeve ball nut 7; first guide key 8; left rotating ball screw 9; support bearing 10; spacer 11; bearing seat 12; bearing baffle 13; bearing gland 14; right rotating ball screw 15; second guide key 16; left rotating ball nut 17; right rotating ball nut 18. DETAILED DESCRIPTION

[0014] In Figure 1 , the servo motor 1 is connected with the speed reducer 2, the speed reducer 2 is installed on the gear box 3, the driving gear 5 is installed on the output shaft of the speed reducer 2, the driven gear 6 is installed on the sleeve ball nut 7, the right end of the sleeve ball nut 7 is the left rotating ball nut 17, the left end is the right rotating ball nut 18, the left rotating ball screw 9 and the right end left rotating ball nut form a ball screw pair, and the right rotating ball screw 15 and the left end right rotating ball nut form a ball screw pair; here, the diameter of the left rotating ball screw 9 is greater than that of the right rotating ball screw 15, and a long hole is made in the center of the left rotating ball screw 9, when the two ends of the screw are closed, the right rotating ball screw 15 can enter the long hole in the center of the left rotating ball screw 9; the outer diameter of the sleeve ball nut 7 is provided with support bearings 10, and the two support bearings 10 are provided with a spacer 11, the outer rings of the two support bearings 10 are installed on the bearing seat 12, and the inner and outer rings of the left end support bearing are fixed by the bearing baffle 13 and the bearing gland 14 respectively; the outer diameter of the left rotating ball screw 9 and the right rotating ball screw 15 is processed with a long guide key groove, the gear box cover 4 is provided with a first guide key 8, which cooperates with the long guide key groove on the outer diameter of the left rotating ball screw 9 to limit the rotation of the left rotating ball screw 9, so that the left rotating ball screw 9 can only move straight forward and backward; similarly, the bearing gland 14 is provided with a second guide key 16, which cooperates with the long guide key groove on the outer diameter of the right rotating ball screw 15 to limit the rotation of the right rotating ball screw 15, so that the right rotating ball screw 15 can only move straight forward and backward.

[0015] Working principle: the servo motor 1 drives the driving gear 5 to rotate through the speed reducer 2, so that the driven gear 6 rotates to drive the sleeve ball nut 7 to rotate, so that the left rotating ball screw 9 and the right rotating ball screw 15 can be simultaneously expanded and closed.

[0016] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A bidirectional synchronous electric push rod, comprising a gear box (3), a gear box cover (4), a sleeve ball nut (7), a left-hand ball screw (9), a right-hand ball screw (15), a bearing seat (12), characterized in that, The sleeve ball nut (7) is provided with a left-hand ball nut (17) at the right end and a right-hand ball nut (18) at the left end, the left-hand ball screw (9) and the right-end left-hand ball nut form a ball screw pair, and the right-hand ball screw (15) and the left-end right-hand ball nut form a ball screw pair; the left-hand ball screw (9) has a larger diameter than the right-hand ball screw (15), and the left-hand ball screw (9) has a long hole in the center, when the left-hand and right-hand ball screws at both ends are closed, the right-hand ball screw (15) can enter the long hole in the center of the left-hand ball screw (9); the sleeve ball nut (7) is provided with support bearings (10) at both ends of the outer diameter, a spacer sleeve (11) is arranged between the two support bearings (10), the outer rings of the two support bearings (10) are mounted on the bearing seat (12), and the inner and outer rings of the left-end support bearing are fixed by the bearing baffle (13) and the bearing pressure cover (14) respectively; the left-hand ball screw (9) and the right-hand ball screw (15) are respectively provided with long guide key grooves on the outer diameters.

2. The bidirectional synchronous electric trolley as claimed in claim 1, characterized in that, The gear box cover (4) is provided with a first guide key (8) and cooperates with the long guide key groove on the outer diameter of the left-hand ball screw (9), so as to limit the rotation of the left-hand ball screw (9) and make the left-hand ball screw (9) move linearly forward and backward only.

3. The bidirectional synchronous electric tappet according to claim 1, characterized in that The bearing pressure cover (14) is provided with a second guide key (16) and cooperates with the long guide key groove on the outer diameter of the right-hand ball screw (15), so as to limit the rotation of the right-hand ball screw (15) and make the right-hand ball screw (15) move linearly forward and backward only.

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