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. 08, 2013
Filed:
Apr. 14, 2010
Armando Codeca, Offanengo, IT;
Matteo Cortesi, Offanengo, IT;
Franco Fermini, Offanengo, IT;
VHIT S.p.A., Offanengo (CR), IT;
Abstract
An internal gear fluidic machine, in particular a pump for the lubrication circuit of a motor vehicle engine, comprises an operating part including an external gear () and an internal gear (), which is housed within an axial cavity () of the external gear () and meshes with the latter. The external gear () is associated with a translating mechanism (), arranged to cause an axial sliding thereof relative to the internal gear () in order to vary the capacity and the fluid flow rate of the machine. The translating mechanism () defines a first capacity, adjustment space () in communication with a high pressure chamber () of the machine, and a second capacity adjustment space () where pressure conditions exist that are dependent on the operating conditions of an element, different from the high pressure chamber (), of a fluidic circuit in which the machine () is connected. The translating mechanism () causes the sliding of the external gear () in response to the pressure conditions existing in the first or the second capacity adjustment spaces (), or in response to the combination of the pressure conditions existing in both spaces. The invention also concerns a method of varying the capacity of an internal gear fluidic machine.