Seat belt retractot with hydraulic load limiting
First Claim
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1. A seat belt retractor comprising:
- a belt reel;
a free-flowing load limiting medium arranged in a working chamber;
a displacement means drivable by the belt reel the displacement means being either a linear displacement means or a rotary displacement means;
at least one flow channel through which the load limiting medium is transported by the displacement means in the direction of linear or rotational displacement;
the flow cross-section in the at least one flow channel exhibits, as a function of the kinematic viscosity of the load limiting medium, a constant area, the dimensions of which lie, in the case of a linear displacement means, in the range delimited by the two curves (KL1, KL2) in FIG. 6, the constant area being less than 3.5 mm2 at kinematic viscosities of less than 3000 mm2/s, or in the case of a rotary displacement means, in the range delimited by the two curves (KR1, KR2) in FIG. 7, the constant area being 4 mm2 or less at kinematic viscosities of less than 3000 mm2/s.
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Abstract
A seat belt retractor for a vehicle seat belt has a belt reel for the seat belt. A free-flowing load limiting medium is arranged in a working chamber. A displacement means is drivable by the belt reel. The load limiting medium is transported through at least one flow channel by the displacement means. The flow cross-section in the flow channel is selected as a function of the kinematic viscosity of the load limiting medium, to achieve a belt force limitation profile over time which approaches that of a torque rod.
39 Citations
5 Claims
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1. A seat belt retractor comprising:
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a belt reel;
a free-flowing load limiting medium arranged in a working chamber;
a displacement means drivable by the belt reel the displacement means being either a linear displacement means or a rotary displacement means;
at least one flow channel through which the load limiting medium is transported by the displacement means in the direction of linear or rotational displacement;
the flow cross-section in the at least one flow channel exhibits, as a function of the kinematic viscosity of the load limiting medium, a constant area, the dimensions of which lie, in the case of a linear displacement means, in the range delimited by the two curves (KL1, KL2) in FIG. 6, the constant area being less than 3.5 mm2 at kinematic viscosities of less than 3000 mm2/s, or in the case of a rotary displacement means, in the range delimited by the two curves (KR1, KR2) in FIG. 7, the constant area being 4 mm2 or less at kinematic viscosities of less than 3000 mm2/s. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeKey Safety Systems, Inc. (Ningbo Junsheng Investment Group Co., Ltd.)
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Original AssigneeKey Safety Systems, Inc. (Ningbo Junsheng Investment Group Co., Ltd.)
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InventorsHeckmayr, Thomas
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Primary Examiner(s)DUNN, DAVID R
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Application NumberUS10/259,449Publication NumberTime in Patent Office708 DaysField of Search280/805, 280/806, 280/807, 242/379.1, 242/381, 297/470, 188/318US Class Current280/805CPC Class CodesB60R 2022/282 using fluids or vico-elasti...B60R 2022/283 using tearing or scoring of...B60R 22/3413 operating between belt reel...
