The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 1979
Filed:
Apr. 14, 1977
Helmut Muller, Heidenheim, DE;
Voith Getreibe KG, Heidenheim, DE;
Abstract
A drive for high-speed locomotives has a variable-speed electric motor which transmits torque to the input shaft of a hydrodynamic power transmission having a hydrodynamic torque converter and a hydrodynamic coupling for transmission of torque to the output shaft which drives the wheels through the medium of a mechanical transmission and cardan shafts. The control unit of the drive engages the converter in the lowest speed range, the coupling in the highest speed range, and the coupling or the converter in the intermediate speed range. In the intermediate speed range, the coupling is engaged when the control unit ascertains that the ratio of maximum traction effort of the drive in engaged condition of the coupling at the momentary intermediate speed to the resistance which the locomotive encounters exceeds one. The resistance is ascertained automatically by determining the tractive effort of the drive in engaged condition of the converter at the momentary intermediate speed and by subtracting therefrom the accelerating force which is the product of the mass of locomotive plus cars (if any) and the momentary acceleration of the vehicle. The output shaft receives braking torque from a hydrodynamic brake whose controls include safety features to insure the application of brake in the event of failure of the primary actuating device.