Seat belt retractor and seat belt device using the same

Abstract

The present invention provides a seat belt retractor and a seat belt device capable of reducing the electric current consumption of the motor and controlling the motor more simply, and realizing two winding performances of rapidly winding the seat belt and winding the seat belt with a high torque . In the state where the clutch pawl (49) and the internal gear (30) are not engaged, the clutch gear (43) is meshed with the planet carrier gear (31) by making the motor rotate forward in the direction of winding the safety belt. Thus, the low reduction ratio transmission mode is set, and the seat belt can be wound at high speed and with low torque. When the seat belt is tensioned and the load of the seat belt rises, the clutch pawl (49) can be engaged with the internal gear (30). Moreover, when the motor current increases and exceeds the set value, the motor is reversed, and the clutch gear (43) is separated from the transmission gear (31). As a result, the transmission mode with a high reduction ratio is set, and the seat belt is wound at a low speed and with a high torque.

Description

technical field [0001] The present invention relates to a seat belt retractor equipped on a motor vehicle, an airplane, a ship, etc., on which passengers ride and move (hereinafter collectively referred to as a vehicle) and is wound by a motor to constrain and protect the seat belt of the passenger, and the use of the seat belt retractor. A seat belt device of a seat belt retractor, in particular, relates to a seat belt retractor capable of efficiently winding a seat belt by utilizing limited electric power consumption of a motor, and a seat belt device using the seat belt retractor. Background technique [0002] Conventionally, a seat belt device equipped on a vehicle such as a motor vehicle includes at least a seat belt retractor for winding a seat belt, a tongue slidably supported on the seat belt, and a buckle capable of being engaged with the tongue. In the state of wearing the seat belt with the tongue fastened on the buckle, when a collision occurs and a large deceler...

AI Technical Summary

Problems solved by technology

Therefore, although the seat belt retractor shown in Patent Document 2 has two transmission paths with different reduction ratios as transmission paths, it has only one transmission path with a fixed reduction ratio for directly transmitting the rotational torque of the motor to the transmission path. on the scroll

Therefore, when the rotational torque of the motor is directly transmitted to the reel, as in the above-mentioned Patent Document 1, only one transmission path with a fixed reduction ratio is uniquely set, and it is difficult to flexibly and effectively adapt to the above-mentioned various reel rotation speeds. and the belt winding torque of the reel

Images