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:
Jul. 15, 1980
Filed:
Feb. 23, 1978
Walter Z Ruseff, New Lenox, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
Variable displacement pumps are each provided with internal biasing means which adjusts displacement in response to spring forces, discharge pressures and net swivel torque forces in order to limit output pressure and to avoid overtaxing the power output capabilities of the motor which drives the pumps. In a system where a plurality of such pumps each supply a separate fluid-operated device but are driven by a single motor, the internal displacement control means of each pump may be arranged to be responsive in part to the discharge pressure of each other pump. The pumps may operate at different power output levels and if one experiences a relatively heavy load, the displacements of the others also reduce if necessary to avoid exceeding the power limitations of the drive motor from a total system overload.