Anti-jumping linear actuator

Abstract

The utility model discloses an anti-jumping type linear actuator, which comprises a cover plate assembly, a tail cover assembly, a stator assembly and a rotor assembly, the rotor assembly comprises a rotor shaft, a magnetic ring, a commutator and an output shaft, and the tail part of the rotor shaft is connected with a fixed sheet through a limiting sleeve. And a bearing mounting surface on the rotor shaft is of a concave-convex rib structure. The circumferential welding and injection molding processes of the fixing piece, the limiting sleeve and the rotor shaft are good, the firmness is better, the coaxiality is higher when the rotor shaft rotates, the jumping condition is avoided, and the working stability of the rotor assembly is good; the bearing mounting surface on the rotor shaft is designed into a concave-convex rib structure, and after the injection molding process, the shrinkage amount of the bearing mounting surface is extremely small, the outer diameter of the bearing mounting surface is ensured, the roundness of the whole bearing mounting surface is relatively good, and the phenomena of bearing press mounting damage and clamping stagnation are avoided when the bearing is press-mounted.

Description

TECHNICAL FIELD

[0001] The utility model relates to power drive device especially a linear actuator. BACKGROUND

[0002] Power drive device can be divided into linear actuator, rotary actuator (circumferential motion motor) etc., and linear actuator (EGR actuator) is an actuator, for linear motion output, and compared with rotary actuator, it is for rotary motion output. It can be applied to engine exhaust gas recirculation flow control, and the purpose is to improve engine thermal efficiency and economy, and reduce nitrogen oxide (NO x ) emission. Linear actuator mainly comprises rotor assembly and stator assembly etc., and rotor assembly is a rotating part, which is used for realizing the conversion device of electric energy and mechanical energy and mechanical energy and electric energy.

[0003] At present, linear actuator generally includes cover plate assembly, tail cover assembly, stator assembly (including coil silicon steel sheet, stator shell), rotor assembly (including rotor shaft and bearing, magnetic coil, limit sheet, fixed sheet, commutator, output shaft etc.); the rotor shaft of rotor assembly is injection molded with magnetic coil and limit sheet, then the limit sheet at the tail of rotor shaft is connected with fixed sheet through welding (four-point argon arc welding mode), there are spot welding defects and easy welding-through problems, the fixed sheet and limit sheet, rotor shaft combination firmness is poor, when rotor shaft is running, corresponding bounce is large, work is unstable and the like; in addition, the bearing mounting surface of rotor shaft of rotor assembly is integral circular surface structure, after injection molding, the integral circular surface structure can cause deformation shrinkage problem of bearing mounting surface, leading to that the roundness of whole bearing mounting surface is poor and presents oval shape, size deviation is large, and then when pressing the bearing (ball bearing), pressing is difficult and easy to cause bearing pressing damage, and the bearing rotation is stuck. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of linear actuators of anti-bounce type to solve the deficiencies of prior art, and the utility model discloses a kind of linear actuators of anti-bounce type.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme: the anti-bounce type linear actuator includes cover plate assembly, tail cover assembly, stator assembly, rotor assembly, the rotor assembly includes rotor shaft, magnetic coil, commutator, output shaft, the tail of the rotor shaft is connected with fixed sheet by limit sleeve.

[0006] The limit sleeve is hollow cylindrical structure. Multiple through holes are provided on the wall surface of the limit sleeve to make the rotor shaft more firmly combined with the injection molding material. The bearing mounting surface on the rotor shaft is in a concave-convex rib structure.

[0007] After the structure of the utility model, the limiting sleeve and the fixed sheet are pressed together through laser welding for one round, the fixed sheet, the limiting sleeve and the circumference of the rotor shaft are welded and the injection molding process is good and the firmness is better, the welding bad phenomenon such as welding penetration does not appear, the coaxiality is higher when the rotor shaft rotates and the jumping condition does not appear, the working stability of the rotor assembly is good, the bearing mounting surface on the rotor shaft is designed as a concave-convex rib structure and after the injection molding process, the shrinkage of this bearing mounting surface is extremely small, the outer diameter size of the bearing mounting surface is guaranteed, the roundness of the whole bearing mounting surface is better, when the bearing is pressed, the bearing pressing damage and the jamming phenomenon do not appear. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is a structure schematic view of the anti-jumping linear actuator of the utility model.

[0009] Figure 2 It is a partial sectional view of the rotor assembly in Figure 1

[0010] Figure 3 It is a structure schematic view of the rotor assembly in Figure 1 DETAILED DESCRIPTION

[0011] Referring to Figures 1 to 3 It can be known that the utility model discloses an anti-jumping linear actuator (EGR actuator), including cover plate assembly 3, tail cover assembly 1, stator assembly 4 (including coil, stator shell), rotor assembly 2, the rotor assembly 2 includes rotor shaft 24, magnetic ring 21, commutator 25, output shaft 27, the tail of rotor shaft 24 is connected through limiting sleeve 22 and fixed sheet 23.

[0012] The limiting sleeve 22 is hollow cylindrical structure, the limiting sleeve 22 and fixed sheet 23 are pressed together through laser welding for one round, the welding and injection molding process of fixed sheet 23, limiting sleeve 22 and rotor shaft 24 are good, and the firmness is better, the coaxiality is higher when the rotor shaft rotates, the wall of limiting sleeve 22 is equipped with multiple through holes 26 and is combined with the injection molding material of rotor shaft 24 more firmly. The bearing mounting surface 28 (respectively at the upper and lower parts of rotor shaft 24 and all correspondingly equipped with bearing 29) on rotor shaft 24 is concave-convex rib structure (that is part of the surface structure, as shown in Figure 3 After the injection molding process, the shrinkage of this bearing mounting surface is extremely small, the outer diameter size of the bearing mounting surface is guaranteed, and the roundness of the whole bearing mounting surface is better.

[0013] The coil of the stator assembly 4 is magnetically inducted with the magnetic ring 21 of the rotor assembly 2, drives the rotary engagement movement of rotor shaft 24 and output shaft 27 and makes the output shaft make linear expansion and contraction movement and outputs power.​​

Claims

1. An anti-jump linear actuator, comprising a cover plate assembly, a tail cover assembly, a stator assembly, and a rotor assembly, wherein the rotor assembly comprises a rotor shaft, a magnetic coil, a commutator, and an output shaft, characterized in that: The tail end of the rotor shaft is connected to the fixing plate via a limiting sleeve.

2. The anti-skip linear actuator as described in claim 1, characterized in that: The limiting sleeve is a hollow cylindrical structure.

3. The anti-skip linear actuator as described in claim 1 or 2, characterized in that: The wall surface of the limiting sleeve is provided with multiple through holes.

4. The anti-skip linear actuator as described in claim 1 or 2, characterized in that: The bearing mounting surface on the rotor shaft has a concave-convex rib structure.

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