A wet disc brake

The wet disc brake with a contactless wear sensor assembly addresses the challenge of invasive wear measurement by continuously monitoring disc pack wear, ensuring timely replacement and preventing safety issues in hazardous environments.

WO2025262024A1 Publication Date: 2025-12-26MERITOR HEAVY VEHICLE SYST CAMERI
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Patent Information

Application Number
PCT/EP2025/066858
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-06-17
Filing Date
2025-06-17
Publication Date
2025-12-26

AI Technical Summary

Technical Problem

Existing methods for measuring the wear of a disc pack in a wet disc brake require disassembly or manual intervention, which is impractical and risky, especially in hazardous environments like mining, where brake failure can lead to significant safety and financial disruptions.

Method used

A wet disc brake with a contactless wear sensor assembly, such as an ultrasonic sensor, measures the axial length of the disc pack in operation, using fixed and movable reference surfaces to determine wear without disassembly, allowing continuous monitoring and alerting when replacement is necessary.

Benefits of technology

Enables continuous, non-invasive wear monitoring, reducing the risk of brake failure by providing timely alerts and minimizing downtime, thus enhancing safety and operational efficiency in off-highway vehicles.

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Abstract

The present invention relates to a wet disc brake (10) for an off-highway vehicle comprising: a brake caliper (14), a disc pack (28) located within the brake caliper (14) and arranged to locate on a vehicle shaft having a longitudinal axis extending in an inboard-outboard direction, the disc pack (28) comprising: a plurality of counter discs (30) arranged in series on the axis; and a plurality of friction discs (34) arranged in series on the axis in an alternating arrangement with the counter discs (30), each friction disc (34) comprising friction material and being configured to be rotatably fixed to the vehicle shaft; and a piston (46) actuatable within the brake caliper (14) during a brake operation to urge the friction material of the friction discs (34) to engage the counter discs (30) to slow the vehicle; and a contactless wear sensor assembly (66) configured to measure the axial length of the disc pack (28).
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