초록 ▼

This invention relates to a fluid mechanism with two cylinder capacities, comprising a distributor valve defining first and second enclosures containing supply and exhaust fluids comprising two groups of distribution conduits, and a device for selecting the cylinder capacity, constituted by a bore a

This invention relates to a fluid mechanism with two cylinder capacities, comprising a distributor valve defining first and second enclosures containing supply and exhaust fluids comprising two groups of distribution conduits, and a device for selecting the cylinder capacity, constituted by a bore and a slide element for selection. According to the invention, a first and a second connection conduit connect the first and second enclosures to the bore and open out between transverse planes; distribution conduits open out in the bore between these planes; and the slide element comprises a groove contained between said planes and establishing communication between the distribution conduits and the connection conduit. One application of the invention is the production of a compact motor.

대표청구항 ▼

A pressurized fluid mechanism, such as a hydraulic motor or pump, with at least two distinct operational cylinder capacities, comprising: a reaction cam; a structure fast with said reaction cam and supporting it; a cylinder-block mounted for relative rotation with respect to said structure about an

A pressurized fluid mechanism, such as a hydraulic motor or pump, with at least two distinct operational cylinder capacities, comprising: a reaction cam; a structure fast with said reaction cam and supporting it; a cylinder-block mounted for relative rotation with respect to said structure about an axis of rotation and provided with a plane communication face perpendicular to the axis of rotation; a plurality of cylinders arranged in said cylinder-block; a plurality of pistons mounted to slide in said cylinders, at least one piston per cylinder defining inside said cylinder a fluid working chamber, which communicates with said communication face by a cylinder conduit; an internal fluid distributor valve which is fast, with respect to rotation of said reaction cam, which defines between itself and said structure at least first and second principal fluid enclosures capable of containing, respectively, a fluid for supplying said working chamber and a fluid for exhaust of fluid from the working chambers, and which comprises a plane distribution face perpendicular to said axis of rotation, capable of being in substantially tight abutment on said communication face, distribution face into which open out pairs of distribution conduits made in the internal fluid distributor valve and distributed in at least two distinct groups of pairs of distribution conduits; a device for selecting the cylinder capacity, which is constituted by a bore made in the internal fluid distributor and by a selection slide element mounted to move inside said bore, which is disposed on the distribution, conduits of at least a first of said two groups of pairs of distribution conduits, the mobile slide element comprising at least two positions, a first position in which first distribution conduits, one of each pair, of said two groups of pairs of distribution conduits are connected to a first of said principal enclosures, the second distribution conduits of said pairs of distribution conduits then being connected to the second of the two principal enclosures, and the second position in which the first distribution conduits and the second distribution conduits of said first group of pairs of distribution conduits are placed in mutual communication, the first distribution conduits of the second group of pairs of distribution conduits being connected to said first principal enclosure and the second distribution conduits of said second group of pairs of distribution conduits being connected to said second principal enclosure; wherein: a1) at least one first and at least one second connection conduit, made in the internal fluid distributor valve, connect said first and second principal enclosures to said bore of the device for selecting the cylinder capacity and open out in this bore between planes belonging to a group of two first transverse planes and between planes belonging to a group of two second transverse planes, respectively; b1) particular distribution conduits, constituted by distribution conduits belonging to the first group of pairs of distribution conduits, open out in said bore between two particular transverse planes belonging either to the group of said two first particular transverse planes, or to the group of said two second transverse planes; c1) the mobile slide element of the device for selecting the cylinder capacity comprises at least one groove capable of being disposed at least partially between said two particular transverse planes; and d1) in the first position of the mobile slide element of the device for selecting the cylinder capacity, said groove is effectively contained at least partially between said two particular transverse planes and establishes communication between said particular distribution conduits and that of said first and second connection conduits which opens out between said two particular transverse planes, whilst, in its second position, said slide element obturates said connection conduit.