US 12,304,420 B2
Belt retractor
Arndt Söhnchen, Hamburg (DE); Jens Ehlers, Horst (DE); Ronald Jabusch, Elmshorn (DE); Antto-Christian Glaesser, Hasloh (DE); and Alexandru Cirstea, Elmshorn (DE)
Assigned to AUTOLIV DEVELOPMENT AB, Vargarda (SE)
Appl. No. 18/005,154
Filed by Autoliv Development AB, Vargarda (SE)
PCT Filed Jul. 12, 2021, PCT No. PCT/EP2021/069257
§ 371(c)(1), (2) Date Jan. 11, 2023,
PCT Pub. No. WO2022/013118, PCT Pub. Date Jan. 20, 2022.
Claims priority of application No. 10 2020 208 905.1 (DE), filed on Jul. 16, 2020.
Prior Publication US 2023/0256933 A1, Aug. 17, 2023
Int. Cl. B60R 22/34 (2006.01)
CPC B60R 22/34 (2013.01) 9 Claims
OG exemplary drawing
 
1. A belt retractor comprising
a belt shaft which is rotatably mounted in a housing and onto which a safety belt can be wound, the housing being able to be fastened to the vehicle, and
an electric motor for driving the belt shaft to move rotationally, and
a gear mechanism transmitting the rotational movement from the electric motor to the belt shaft, wherein
the gear mechanism can be driven as an assembly in a first force-transmission path to drive the belt shaft with a first torque, and
the gear mechanism can be driven to drive the belt shaft with a second torque, by shifting a speed-controlled and/or torque-controlled coupling, whereby a second force-transmission path is opened, wherein
the coupling has at least one coupling element which is spring-loaded by a spring into engagement in a first part of the gear mechanism, comprising
a drive wheel which is connected to the electric motor in a rotationally fixed manner is provided with a polygonal force-transmission profile, wherein
the coupling element has at least one force-transmission portion which abuts the polygonal force-transmission profile and by which the coupling element can be moved, against the force of the spring, out of engagement in the first part of the gear mechanism due to a relative movement of the drive wheel relative to the coupling element when a predetermined rotational speed transmitted by the drive wheel and/or a predetermined torque and/or a predetermined rotational acceleration is exceeded.