Seat belt retractor
First Claim
1. A seat belt retractor, comprising:
- a base frame, a spool journalled to the base frame, a webbing wound around the spool, a motor connected to the spool for rotating the spool, and a speed-reduction mechanism interposed between the motor and the spool, said speed-reduction mechanism including at least one transmission train with a predetermined gear ratio, a common transmission element attached to the transmission train, and resistant torque means connected to the transmission train and having a preset value so that the common transmission element transmits rotation of the motor to the spool when a rotational torque of the motor applied to the resistant torque means is smaller than the preset value, said resistant torque means being a slip mechanism including a viscosity resistant element disposed on the transmission train of the speed-reduction mechanism.
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0 Petitions
Accused Products
Abstract
A seat belt retractor includes a base frame, a spool journalled to the base frame, a webbing wound around the spool, and a motor for rotating the spool. A speed-reduction mechanism is interposed between the motor and the spool. The speed-reduction mechanism includes at least one transmission train with a predetermined gear ratio, a common transmission element connected to the transmission train, and a resistant torque device connected to the transmission train. The common transmission element transmits rotation of the motor to the spool when the torque of the rotation is smaller than the preset value. Winding of the webbing is made based on the wearing condition of the webbing and the running condition of the vehicle.
76 Citations
12 Claims
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1. A seat belt retractor, comprising:
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a base frame, a spool journalled to the base frame, a webbing wound around the spool, a motor connected to the spool for rotating the spool, and a speed-reduction mechanism interposed between the motor and the spool, said speed-reduction mechanism including at least one transmission train with a predetermined gear ratio, a common transmission element attached to the transmission train, and resistant torque means connected to the transmission train and having a preset value so that the common transmission element transmits rotation of the motor to the spool when a rotational torque of the motor applied to the resistant torque means is smaller than the preset value, said resistant torque means being a slip mechanism including a viscosity resistant element disposed on the transmission train of the speed-reduction mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A seat belt retractor, comprising:
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a base frame, a spool journalled to the base frame, a webbing wound around the spool, a motor connected to the spool for rotating the spool, and a speed-reduction mechanism interposed between the motor and the spool, said speed-reduction mechanism including two transmission trains with predetermined different gear ratios having an internal gear with ratchet teeth;
switching means for switching the transmission trains to one of the transmission trains corresponding to a driving signal obtained from an external unit, said switching means including a pawl mechanism having first and second pawls journalled by pawl shafts and engaging the ratchet teeth to fix rotation of the internal gear, said first pawl pivoting about the pawl shaft by excitation of a solenoid to engage one of the ratchet teeth, and then allowing the second pawl to engage another of the ratchet teeth;
a common transmission element common to the two transmission trains attached to the transmission trains; and
resistant torque means connected to and interposed between the transmission trains and having a preset value so that the common transmission element transmits rotation of the motor to the spool when a rotational torque of the motor applied to the resistant torque means is smaller than the preset value.
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Specification