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Vehicle door lock with a centrally-operated locking unit

  • US 5,762,384 A
  • Filed: 10/25/1996
  • Issued: 06/09/1998
  • Est. Priority Date: 10/26/1995
  • Status: Expired due to Fees
First Claim
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1. A motor-vehicle door lock comprising:

  • a closure-element component provided with a pivotable bolt engageable with a door-frame pin and a keeper for said bolt;

    a locking-element component adjacent said closure-element component and operatively connected therewith;

    an actuating-element component comprised of opening actuation elements and of a securing actuation element, at least one of said components being provided with a main element operable by a central lock unit;

    a polyphase reversible stepping motor having a phase-conforming stator winding and provided with a step-down transmission operatively connected to said main element for operating same in response to a signal from a remote source said motor, said transmission and said main element forming a centrally operable unit,the polyphase reversible stepping motor being designed to have a certain nominal power LN at an output of said polyphase stepping motor under constant energization,the centrally operable unit being designed to have a required drive power LANZ greater than said nominal power LN of said polyphase stepping motor whereby LN is less than LANZ ;

    means for energizing said polyphase reversible stepping motor with a working voltage UAR which is greater than a design voltage UAU of said polyphase reversible stepping motor and corresponding to the drive power of the centrally operable unit; and

    a computer controlling said polyphase reversible stepping motor and provided with position-monitoring means for monitoring a position of at least one of said elements as a motor-stepping monitor.

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