Power actuator for motor-vehicle door latch

Details Power actuator for motor-vehicle door latch Power actuator for motor-vehicle door latch

1993-07-28

1994-12-20

Herrmann, Allan D.

Machine element or mechanism

Mechanical movements

Reciprocating or oscillating to or from alternating rotary

74354, 74404, 292DIG43, 292201, F16H 2518, F16H 340, E05B 4700

Patent

active

053737520

ABSTRACT:
A motor-vehicle power actuator has a housing, an electric motor in the housing having an output shaft, an input gear fixed on the shaft, a threaded spindle extending along and rotatable about a spindle axis in the housing, an output gear fixed on the spindle adjacent and out of contact with the input gear, and a nut threaded on the spindle and nonrotatable relative thereto. Thus rotation of the spindle in one rotational sense displaces the nut axially relative to the spindle axis in a release direction. A rocker pivotal in the housing on the shaft axis carries an intermediate gear meshing with the input gear, and also meshable with the output gear. The rocker is pivotal between an end position in which the intermediate gear meshes with the output gear and through an intermediate position in which the intermediate gear does not mesh with the output gear. The rocker and intermediate gear are so positioned that, on normal forward rotation of the motor shaft, the rocker moves into its end position. A biasing unit urges the rocker into the intermediate position except when the motor is energized and is rotatably driving its shaft and a spring unit engaged between the housing and the nut axially biases the nut in one of the directions so that when the motor is not actuated the biasing unit disconnects the input and intermediate gears from the output gear and the spring unit urges the nut in the one direction.

REFERENCES:
patent: 4624491 (1986-11-01), Vincent
patent: 4669283 (1987-06-01), Ingenhoven
patent: 4723454 (1988-02-01), Periou et al.
patent: 4932277 (1990-06-01), Beaux
patent: 4978155 (1990-12-01), Kobayashi
patent: 5079964 (1992-01-01), Hamada et al.
patent: 5149156 (1992-09-01), Kleefeldt

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