BRAKE RELEASE SYSTEM VIA MECHANICAL CONTROL OF A DISC BRAKE CALIPER MOVEMENT

The clamping device with an epicyclic gear train and elastically deformable element addresses the issue of brake release in motor failure by ensuring automatic brake release, maintaining vehicle control and enabling continued movement.

FR3168927A1Pending Publication Date: 2026-05-29HITACHI ASTEMO FRANCE
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
HITACHI ASTEMO FRANCE
Filing Date
2024-11-25
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing electromechanical brake systems fail to automatically return the caliper to its inactive position in the event of a motor failure, leading to potential disruption of vehicle control and continued braking.

Method used

A clamping device with an epicyclic reduction gear train and an elastically deformable element, such as a spiral spring, allows the clamping force application member to be moved away from the friction element, ensuring automatic release in the event of motor failure by converting rotational motion into translational motion through a nut and ball screw mechanism.

Benefits of technology

Ensures safe and predictable brake release, maintaining vehicle control and allowing continued movement even in the absence of electrical actuation, applicable to both self-locking and non-self-locking brakes.

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Abstract

The invention relates in particular to a clamping device for a brake system comprising an electric actuator, a clamping force application member with at least one friction element, a ball screw and nut transmission, and an epicyclic reduction gear train (1). The device includes a rotationally elastically deformable element (6), fixed between a toothed ring (5) of the epicyclic reduction gear train (1) and a housing (2) receiving said gear train. The elastically deformable element (6) is angularly constrained in the active position of the toothed ring (5) such that, in the event of a motor failure, the elastically constrained element (6) rotates the toothed ring (5) from its active position to its rest position to actuate a reverse rotation of the epicyclic reduction gear train (1), thus ensuring a reverse translation of the transmission sufficient to retract a force application member. Figure for the abstract: [Fig. 4]
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