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. 16, 1989
Filed:
Oct. 26, 1987
Charles E Kraus, Austin, TX (US);
Excelermatic Inc., Austin, TX (US);
Abstract
A hydraulic speed control arrangement for an infinitely variable transmission which is coupled to an engine and adapted to drive auxiliary equipment including a hydraulic fluid displacement pump includes a spool valve provided with an inlet cavity at one end of the valve spool in the valve body and connected to the hydraulic fluid displacement pump and has a spring disposed at the opposite end and biasing the valve spool against the pressure of the fluid in the inlet cavity, whereby the valve spool is adapted to control the flow of pressurized fluid from the inlet cavity to the transmission ratio control mechanism of the infinitely variable transmission in such a manner that the output shaft speed of the transmission is maintained essentially at a predetermined value. The valve spool had a face portion at its one end provided with a flow orifice structure at its circumference and, further there is a pressuzized fluid cavity disposed adjacent the valve spool face portion so as to control the fluid flow through the orifice structure depending on the position of the face portion which for some applications is in communication with the area of the valve at the other end of the valve spool and the fluid cavity is connected to a pressurized hydraulic fluid user to supply thereto the pressurized fluid needed thereby.