Seat Belt Retractor

Abstract

The present invention provides a seat belt take-up device capable of reducing the difference in rolling sensitivity of an inertial mass body between an axial direction in which an acceleration sensor rotates relative to a device main body and a direction perpendicular to the axial direction. Restricting surfaces (100, 102) are formed on the mounting surface (96) whose general surface (98) has a conical shape. Therefore, when the sensing ball (110) rolls along the axial direction of the rotation shaft (142, 152), the sensing ball abuts against the limiting surface (100) or the limiting surface (102). In order to further make the induction ball roll along the axial direction of the rotating shaft (142, 152) from this state, it is necessary to make the induction ball (110) climb up the limiting surface (100) or the limiting surface (102) whose inclination angle is larger than the general surface (98). )superior. On the other hand, in order to roll the sensor ball (100) in a direction perpendicular to the axial direction of the rotation shafts (142, 152) in a plan view, it only needs to roll on the general surface (98).

Description

technical field [0001] The present invention relates to a seat belt take-up device constituting a seat belt device for a vehicle, and more particularly to a seat belt take-up device of a type suitable for being built into a seat back of a seat with a seat reclining mechanism mounted on a vehicle. Background technique [0002] In the seat belt take-up device disclosed in the following patent document 1, an inertial mass body (referred to as a sensorball in patent document 1) is placed on a bracket of an acceleration detection member (referred to as an acceleration sensor in patent document 1). )). The bracket is attached to the suspension device so as to be rotatable about an axis whose axial direction is the same as the axial direction of the belt shaft. Thus, when the retractor base is tilted around the axis whose axis is the same as the axial direction of the tape shaft, the bracket rotates relative to the retractor base, and the bracket is intended to be kept in line wit...

AI Technical Summary

Problems solved by technology

Therefore, the inertial mass body is easy to roll in the direction of the rotation axis of the bracket, and the sensitivity of the inertial mass body to roll in the direction of the rotation axis and the direction orthogonal to the axis (mainly the front and rear direction of the vehicle) is different.

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