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:
Oct. 29, 1991
Filed:
Mar. 14, 1990
Mark R Kinder, Indianapolis, IN (US);
Glenn R Wert, Monticello, IN (US);
TRW Inc., Lyndhurst, OH (US);
Abstract
A fluid motor includes an inner gear member and an outer gear member. The gear members are rotatable and orbital relative to each other and define expandable and contractible fluid pockets. The gear members rotate and orbit relative to each other as the fluid pockets expand and contract. A commutator valve is movable with one of the gear members and defines a first region in communication with high pressure, a second region in communication with low pressure, and a third region which is defined by a modulation opening which selectively communicates with high pressure or low pressure. The modulation opening communicates with at least one fluid pocket. A spool valve includes a valve member having at least two positions for controlling the speed of relative movement between the gear members. When the valve member is in a first position, the modulation opening communicates with the low pressure in the second region. When the valve member is in a second position, the modulation opening communicates with the high pressure in the first region. The fluid pocket communicating with the modulation opening is thereby connected to either high pressure or low pressure depending upon the position of the valve member.