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. 08, 1986
Filed:
Aug. 27, 1985
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A vane type rotary pump comprises a cam ring mounted within a stator housing and having an inner peripheral wall defining four circumferentially equi-spaced semicylindrical inner cam surfaces, a pair of end wall structures fitted to opposite ends of the cam ring to form a pump cavity, a drive shaft rotatably mounted within the stator housing, a rotor contained within the pump cavity and mounted on the drive shaft for rotation therewith, and a plurality of circumferentially equi-spaced vanes slidably fitted in the body of the rotor to cooperate with the inner cam surfaces to form four pairs of suction and delivery chambers. One of the end wall structures is formed with four pairs of circumferentially spaced suction and delivery ports in communication with the respective suction and delivery chambers, and a pair of changeover valves are disposed within a pair of delivery passages in connection to a pair of the diametrically opposed delivery ports to connect the delivery passages to the suction ports associated with the diametrically opposed delivery ports in their activated conditions and to disconnect the delivery passages from the suction ports in their deactivated conditions. The changeover valves are arranged to be simultaneously activated when the rotational speed of the drive shaft exceeds a predetermined value.