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. 20, 1981
Filed:
Aug. 29, 1978
Keiji Tachibana, Tokyo, JP;
Yoshihiko Nakayama, Shimoinayoshi, JP;
Junichi Kaneko, Amimachi, JP;
Susumu Ishii, Tsuchiura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus for controlling the operation of a fluid pressure raising system having a motor and a centrifugal fluid machine adapted to be driven by the motor. The apparatus has an overdrive gear disposed between the motor, which is typically an electric motor suited for the commercially available electric power, and the centrifugal fluid machine. The overdrive gear consists of two gear trains or pairs having different overdrive ratios, each consisting of a gear and a pinion meshing with the gear, and a clutch adapted to selectively switch over the gear pair taking part in the torque transmission between the output shaft of the motor and the impeller shaft of the centrifugal fluid machine, from one gear pair to the other gear pair and vice versa. Thus, the overdrive gear can transmit the power of the motor to the impeller at two different overdrive ratios. The clutch is adapted to be actuated in response to a signal representative of an external condition of the fluid pressure raising system, which signal is delivered by a detector.