Seatbelt retractor
AssigneeAutoliv Development AB
InventorsKatsuhiro Ito, Kenichi Morizane
Life of this patent
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Abstract
A pretensioner includes a gas generator, a pinion, a tube pipe, a piston ball, a plurality of balls, and a tube cover. The tube pipe includes a tubular part that is formed continuously from one end portion to the other end in order to receive the piston ball and the plurality of balls. A hook portion formed at the other end portion is angled toward the pinion. A tip end part of the hook portion is attached to at least one of a refractor frame and the tube cover. With this construction, a reduction in an engagement amount between the pinion and the balls during operation of the pretensioner can be prevented, and as a result, the pinion can be rotated efficiently.
Claims5
A seatbelt retractor for retracting a seatbelt, the seatbelt retractor comprising:
- a spindle coupled to the seatbelt for retracting the seatbelt;
- a retractor frame having a pair of side plates that support the spindle so that the spindle is free to rotate;
- and
- a pretensioner that is adapted to cause rotation of the spindle in a retraction direction using a gas pressure,
- wherein the pretensioner comprises:
- an igniter adapted to be ignited and generate the gas pressure;
- a rotary member that rotates integrally with the spindle;
- a guide member disposed around the rotary member and to a side of a side plate of the retractor frame, the igniter being generally attached to one end portion of the guide member;
- a piston member that is located within the guide member and adapted to be pushed within the guide member directly by the gas pressure;
- and
- a plurality of rolling bodies that are located within the guide member and being configured to cause the rotary member to rotate by moving in conjunction with movement of the piston member,
- the guide member further comprises a tubular part formed continuously from the one end portion to another end portion, the piston member and the plurality of rolling bodies being located within the tubular part, and the another end portion having a rectilinear engagement portion and a hook portion angled toward the rotary member, and a tip end part provided on the hook portion and being fixed relative to the retractor frame so as to be incapable of moving relative thereto, a boundary part between the rectilinear engagement portion and the hook portion, the boundary part being configured to deform in a rectilinear fashion when the igniter generates the gas pressure.
Dependencies are inferred from the claim text.