VEHICULAR SEAT BELT

• US 20110031800A1
• Filed: 04/03/2009
• Published: 02/10/2011
• Est. Priority Date: 04/18/2008
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Motozawa, Yasuki
• Granted Patent: US 8,523,097 B2
• Time in Patent Office: Days
• US Class Current: 297/475
• CPC Class Codes: B60R 2022/4642 the gas directly propelling a flexible driving means, e.g. a plurality of successive masses, in a tubular chamber
• CPC Class Codes: B60R 22/4628 characterised by fluid actuators, e.g. pyrotechnic gas generators actuating a cable B60R22/4619

Abstract

A vehicular seat belt device including: a belt reel on which a webbing that restrains an occupant is wound; an actuator that generates instantaneous rotational drive force by gas that is generated during an emergency; a flywheel that rotates by the rotational drive force of the actuator; a speed increasing mechanism that is housed inside the flywheel and that increases the rotational speed of the actuator and transmits it to the flywheel; and a connecting and disconnecting unit that connects a low-speed rotation side of the speed increasing mechanism and the belt reel during rotation of the flywheel, wherein the belt reel rotates to the webbing winding-up direction by the rotational drive force of the actuator.

Claims

1. A vehicular seat belt device comprising:

a belt reel on which a webbing that restrains an occupant is wound;

an actuator that generates instantaneous rotational drive force by gas that is generated during an emergency;

a flywheel that rotates by the rotational drive force of the actuator;

a speed increasing mechanism that is housed inside the flywheel and that increases the rotational speed of the actuator and transmits it to the flywheel; and

a connecting and disconnecting unit that connects a low-speed rotation side of the speed increasing mechanism and the belt reel during rotation of the flywheel, wherein

the belt reel rotates to the webbing winding-up direction by the rotational drive force of the actuator.

2. The vehicular seat belt device according to claim 1, wherein

the speed increasing mechanism comprises:

an external tooth gear that is arranged in a hollow portion inside the flywheel and that rotates integrally with the flywheel; and

an internal tooth gear that is connected to the actuator via the connecting and disconnecting unit and that is meshed with the external tooth gear in the hollow portion, and

the rotating shaft of the flywheel is offset from the rotating shaft of the belt reel.

3. The vehicular seat belt device according to claim 2, wherein

when the rotational speed of the actuator has been decreased, the connecting and disconnecting unit releases the connection between the actuator and the internal tooth gear.