Linear drive with brake mechanism

By employing a combination of ball screw and drum brake in the linear drive, the problems of braking noise and unreliable braking are solved, and the stability and reliability of the screw drive under external axial load are achieved.

CN121844148APending Publication Date: 2026-04-10SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Application Number
CN202480058080.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-09-13
Filing Date
2024-09-12
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The braking device of the existing linear actuator has the problem of grinding noise, and it cannot reliably prevent the rotation of the threaded nut under large external forces, which affects the stability and reliability of the equipment.

Method used

It employs a ball screw drive and a drum brake, utilizing a combination of brake shoes and brake drums to ensure effective braking under external axial loads by releasing and closing the actuating elements, and to transmit power when the drive shaft rotates.

Benefits of technology

This reduces noise, ensures reliable braking of the screw drive under external axial load, prevents unwanted rotation, and improves the stability and reliability of the equipment.

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Abstract

The invention relates to a linear drive comprising a spindle drive (2), the spindle drive parts (4, 5) of which are threadingly engaged, one of the spindle drive parts (4) being mounted for longitudinal movement along a drive axis (10) and having a stroke part (11) for executing a stroke. The drum brake (18) is released when a rotationally driven spindle drive part (5) is rotationally driven and is closed when the stroke part (11) is under external load. The drum brake (18) is provided with a plurality of brake shoes (24) and a brake drum (21) having a brake surface (23) for the brake shoes (24). A release actuating element (26) and a closing actuating element (27) are provided, which actuate the brake shoe (24) in opposite directions.
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