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:
May. 08, 1979
Filed:
Dec. 03, 1976
Ulrich Heitmeyer, Rosbach van der Hohe, DE;
Adrian Kupsa, Dusseldorf, DE;
Hans-Joachim Forster, Stuttgart, DE;
Abstract
A drive aggregate for electric vehicles, especially for trackless street vehicles, which is equipped with an electric shunt motor provided with field current control and with a change-speed transmission having at least two forward speeds connected behind the electric shunt motor; the electric shunt-wound motor thereby has a relatively high rated rotational speed in relation to its maximum rotational speed and a relatively reduced field-weakening range whereby the change-speed transmission is an automatic transmission connected with the electric shunt motor by way of a speed-reducing gear while the oil pump of the automatic transmission is driven by an electric motor coordinated thereto which operates at substantially constant rotational speed.