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:
Jun. 26, 2018
Filed:
Apr. 29, 2016
Caterpillar Inc., Peoria, IL (US);
Steven Edward Johnson, Crest Hill, IL (US);
Caterpillar Inc., Deerfield, IL (US);
Abstract
A hydraulic driven fan system includes at least one first fan motor and a second fan motor connected in series with each other. The system also includes a fixed displacement pump configured to supply a pressurized flow of a hydraulic fluid to the at least one first and second fan motors. The system includes a proportional flow control valve in fluid communication with the at least one first fan motor and configured to allow a regulated amount of the pressurized flow of the hydraulic fluid there through to the corresponding at least one first fan motor. The system includes a pressure compensator disposed parallel to the proportional flow control valve and configured to maintain a pressure difference across the proportional flow control valve. The system further includes a proportional pressure relief valve disposed parallel to the second fan motor and configured to control a pressure difference across the second fan motor.