×

Constant speed hydrostatic drive system

  • US 4,879,501 A
  • Filed: 12/10/1982
  • Issued: 11/07/1989
  • Est. Priority Date: 12/10/1982
  • Status: Expired due to Term
First Claim
Patent Images

1. A constant speed generator drive system adapted for use with a variable speed engine comprising:

  • a. a variable displacement hydraulic pump connected to a powered rotating shaft;

    b. a hydraulic motor;

    c. hydraulic lines operatively connecting said hydraulic motor to said hydraulic pump;

    d. a drive shaft connecting said hydraulic motor to an electrical generator;

    e. means for controlling the displacement of said hydraulic pump relative to the magnitude of a direct current signal applied thereto;

    f. means for delivering a direct current signal to said displacement controlling means responsive to the hydraulic pressure in said hydraulic lines;

    g. speed sensor means;

    h. means for controlling the rotational speed of said drive shaft relative to said speed sensor means;

    i. timing reference means; and

    j. digital trim control means for adjusting said speed sensor means to correspond to said timing reference means.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×