Seatbelt retractor

摘要

When a gas generating member of a pretensioner mechanism is activated in case of vehicle collision, a piston inside a pipe cylinder is moved from normal state and a pinion gear body is rotated. Thus, the teeth of the pinion gear portion come in contact with a push block and pushes it in outward direction in conjunction with a force of a block urging spring, whereby a rotating lever is rotated by the push block and the lower end portion of the rotating lever gets disengaged from the tip end portion of a gear-side arm. As a result, the gear-side arm is rotated by an urging spring in outer direction and rotates a mechanical arm through a coupling shaft to make the pawl engage a ratchet gear of a take-up drum unit.

主权项

1. A seatbelt retractor for removing a slack in a webbing, the seatbelt retractor comprising:
a take-up drum; a ratchet gear formed at a periphery of an edge portion of the take-up drum onto which the webbing is wound; a pawl configured to engage the ratchet gear in response to a predetermined acceleration of a vehicle speed or an acceleration of a webbing-pull-out speed; a pretensioner assembly configured to rotate the take-up drum in a retracting direction to retract the webbing if a vehicle collision occurs; and a housing which includes a first wall portion and a second wall portion facing the first wall portion and houses the take-up drum, wherein:
the pretensioner assembly includes:
a driving device mounted to an outside surface of the first wall portion of the housing and configured to cause the take-up drum to rotate in the retracting direction of the webbing if a vehicle collision occurs; anda locking device which is directly activated by the driving device upon activation of the driving device and locks the pawl in an engaged state with the ratchet gear,the ratchet gear is formed on the periphery of the edge portion of the take-up drum so as to face an inside of the second wall portion of the housing,the pawl is provided at a position where the pawl is disengaged from the ratchet gear while one end of the pawl is mounted directly on and in contact with the inside of the second wall portion of the housing in a rotatable mariner,the locking device comprises:
an arm member of which one end is rotatably supported at the outside of the first wall portion of the housing;a rotating device which is provided at the outside of the first wall portion of the housing and is directly activated by the driving device so as to cause the arm member to rotate in a predetermined direction;a depressing member which is formed separately from the pawl and arranged in contact with a side face of the pawl at an opposite side with respect to the ratchet gear while one end of the depressing member is rotatably supported at the inside of the second wall portion of the housing; anda coupling shaft which couples the arm member and the depressing member, andwherein, if the driving device is activated, the arm member is rotated in the predetermined direction by the rotating device, thereby the depressing member is rotated towards the ratchet gear by the coupling shaft that is connected to the arm member and the pawl is rotated toward the ratchet gear by the depressing member and caused to engage the ratchet gear.