Patent ID: 8550796
Filing Date: 2013-10-08
Classification: F04C

Abstract:
1. A fluidic machine with gears, comprising a supporting part where there are formed a low pressure chamber and a high pressure chamber communicating with low pressure and high pressure sections, respectively, of a fluidic circuit in which the machine is connected, and an operating part for transferring a fluid between said low pressure and high pressure chambers, the operating part being mounted within the supporting part and including in turn: an external gear, arranged to rotate about a first axis and having an internal toothing with a first number of teeth; and an internal gear, which is housed within an axial cavity of the external gear, is arranged to rotate about a second axis different from the first axis and has an external toothing with a second number of teeth, arranged to mesh with the internal toothing of the external gear with only partial fluid seal, the teeth of both gears defining fluid chambers the volume of which changes during rotation and through which the fluid is transferred from a machine inlet connected to one of the low pressure and high pressure chambers to a machine outlet connected to the other one of the low pressure and high pressure chambers; wherein one of the internal and external gears is mounted in an axially fixed position and the other gear is associated with a translating mechanism, arranged to cause an axial sliding thereof relative to the gear mounted in the axially fixed position in order to vary the machine capacity by changing the axial extension of an area over which the teeth of both gears mesh, and wherein the translating mechanism defines a first capacity adjustment space in communication with the high pressure chamber and is arranged to slide in response to first pressure conditions existing in the first capacity adjustment space in order to make the axially slidable gear slide, wherein the translating mechanism further defines a second capacity adjustment space where second pressure conditions exist that are dependent on operating conditions of an element of the fluidic circuit different from the high pressure chamber of the machine, the translating mechanism being axially slidable in the supporting part either in response also to the pressure conditions existing in the second capacity adjustment space, or in response to a combination of the pressure conditions existing in the first and second capacity adjustment spaces; said external gear and said translating mechanism are arranged to define radial oriented openings for fluid inlet/outlet into/from said fluid chambers in order to obtain a radial feed of said fluidic machine; and wherein said translating mechanism comprises an external ring which is rigidly connected for the rotational and translational movements to said external gear.