Seat belt retractor
First Claim
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1. A seat belt retractor comprising:
- a spool for retracting a seat belt;
a locking mechanism including a locking member of which rotation in a belt-withdrawing direction is prevented in an emergency; and
first and second seat belt load limiting mechanisms for limiting a load to be exerted on the seat belt when rotation of the locking member in the belt-withdrawing direction is prevented with the spool rotating relative to the locking member in the belt-withdrawing direction,wherein the second seat belt load limiting mechanism comprises;
a load limit setting mechanism to set a load limit for the seat belt, wherein the load limit setting mechanism is configured to nip the seat belt against a belt recieving portion located in a main body of the load limit setting mechanism; and
a load limit control mechanism to control the load limit setting mechanism to change a load limit of the seat belt in an emergency based on an emergency situation, andwherein the load limit setting mechanism is configured to be reused.
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Abstract
A seat belt system includes a retractor and a seat belt. The retractor includes a motor that drives a pressure rod into a seat belt such that the seat belt is nipped between the pressure rod and belt receiving portions. The driving force of the motor that controls the movement of the pressure rod is set based on the situation at the time of a collision. Thus, the load limit to be exerted on the seat belt is set flexibly and widely according to the situation in an emergency. Further, the motor and the pressure piston rod can be activated repeatedly and, therefore, can be reused.
12 Citations
14 Claims
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1. A seat belt retractor comprising:
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a spool for retracting a seat belt; a locking mechanism including a locking member of which rotation in a belt-withdrawing direction is prevented in an emergency; and first and second seat belt load limiting mechanisms for limiting a load to be exerted on the seat belt when rotation of the locking member in the belt-withdrawing direction is prevented with the spool rotating relative to the locking member in the belt-withdrawing direction, wherein the second seat belt load limiting mechanism comprises; a load limit setting mechanism to set a load limit for the seat belt, wherein the load limit setting mechanism is configured to nip the seat belt against a belt recieving portion located in a main body of the load limit setting mechanism; and a load limit control mechanism to control the load limit setting mechanism to change a load limit of the seat belt in an emergency based on an emergency situation, and wherein the load limit setting mechanism is configured to be reused. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification