Belt retractor for a seat belt system of a motor vehicle

JP2025530395A5Pending Publication Date: 2026-07-06AUTOLIV DEV AB
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
AUTOLIV DEV AB
Filing Date
2023-09-18
Publication Date
2026-07-06

AI Technical Summary

Technical Problem

Existing belt retractors face challenges in efficiently transmitting drive movement from reversible and irreversible tensioners to the belt reel, particularly due to unintentional coupling and blocking of rotational movements, which hinder normal use and require replacement of irreversible tensioners.

Method used

A belt retractor design with a coupling pawl having an enlarged receiving tooth and radially extending force transmission surfaces, aligned to synchronize engagement with the belt reel toothing, reduces bearing forces and ensures direct force transmission, allowing seamless operation during reversible tensioning and automatic disengagement for irreversible tensioning.

Benefits of technology

Enhances efficient force transmission from the drive wheel to the belt reel, minimizing bearing loads and ensuring smooth operation during reversible tensioning, while automatically disengaging for irreversible tensioning, thus optimizing the belt retractor's functionality without requiring replacement.

✦ Generated by Eureka AI based on patent content.

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Abstract

To provide a belt retractor in which the transmission of the driving motion of a drive wheel to a belt shaft is further improved. The belt retractor (1) comprises a belt reel (5), a reversible belt tensioner with a drive wheel (20) driving the belt reel (5), a coupling pawl (21) transmitting a driving motion from the drive wheel (1) to the belt reel (5), and a tension adjusting coupler including a control element (22) having a first control contour (223) for controlling the engagement movement of the coupling pawl (21) with a toothed portion (231). A first tooth (214) is provided on the coupling pawl (21), and the coupling pawl (21) engages with the first tooth at the toothed portion (231), and second teeth (215, 216) are provided, and the first or second tooth (214, 215, 216) is designed to form a receiving tooth that first engages at the toothed portion (231) during the engagement movement of the coupling pawl (21).
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