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:
Jan. 24, 1984
Filed:
Feb. 01, 1980
Curtiss W Robinson, Seattle, WA (US);
Eugene T Raymond, Seattle, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
An electric stepping motor, operated by command pulses from a computer or microprocessor, rotates a rotary control member of a distributor valve, for sequencing hydraulic pressure and flow to the cylinders of one or more axial piston hydraulic motors. A group of the cylinders are subjected to pressure and flow and the remaining cylinders are vented to a return line. Rotation of the rotary control member sequences pressurization by progressively adding a cylinder to the forward edge to the pressurized group and removing a cylinder from the trailing edge of the pressurized group. The pistons of each new pressurized group function to rotate a wobble plate into a new position of equilibrium and the hold it in such position until another change in the makeup of the pressurized group. An increment of displacement of the rotary pressurized group. An increment of displacement of the rotary hydraulic motor occurs in direct response to each command pulse that is received by the stepping motor. In an installation which includes two hydraulic motors connected to a common output, the rotary distributor valve functions to alternate driving pulses of hydraulic pressure and flow between the two motors.