Disc brake device

The disk brake device addresses the issue of O-ring wear and damage by incorporating a groove to distribute stress, improving the O-ring's durability and reducing load on the O-ring.

WO2026127104A1 Publication Date: 2026-06-18ADVICS CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ADVICS CO LTD
Filing Date
2025-12-11
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Conventional disk brake devices experience issues where the O-ring is pushed by brake fluid pressure and enters the narrow gap between the rotating member and the caliper body. In this case, the O-ring is subjected to high loads due to contact with both the stationary caliper body and rotating member, leading to potential wear and damage.

⚗Method used

The disk brake device incorporates a groove on the side surface of the caliper body, allowing the O-ring to elastically deform and distribute stress, reducing the load on the O-ring by having it partially enter the groove instead of the narrow gap between the rotating member and caliper body.

🎯Benefits of technology

This design effectively reduces the stress on the O-ring, minimizing wear and damage by distributing the load between the portion entering the groove and the narrow gap, thereby enhancing the O-ring's durability and performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

A disc brake device according to an embodiment of the present invention includes the following for example: a caliper body that is provided with a hole which extends along a central axis and a bore which opens to the outside and communicates with an end of the hole in a first axial direction extending along the central axis, the caliper body also having an inner peripheral surface which is provided in the bore and faces the central axis, and a side surface which is provided in the bore and in which the hole opens; a rotary member that extends through the hole and has an outer peripheral surface facing the inner peripheral surface; a linear motion member that is attached to a screw thread of the rotary member so as to move in the first axial direction or a second axial direction; a piston that is fitted into the bore so as to be movable along the central axis; and an O-ring that contacts the inner peripheral surface, the side surface, and the outer peripheral surface and seals the space between the inner peripheral surface and the outer peripheral surface. The side surface is provided with a groove separated from the hole.
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