초록 ▼

The invention relates to a hydraulic motor having a plurality of cubic capacities, and provided with individual cubic-capacity selectors associated with at least some of its cylinders, each selector being provided with a control member. According to the invention, the control member coupled to each

The invention relates to a hydraulic motor having a plurality of cubic capacities, and provided with individual cubic-capacity selectors associated with at least some of its cylinders, each selector being provided with a control member. According to the invention, the control member coupled to each of said individual selectors can be activated only in that range of positions of the cylinder associated with said individual selector which corresponds to the axis of said cylinder being in alignment with the crest of one of the undulations, and to positions that are angularly adjacent to the position in which said alignment is obtained. An application of the invention is to making a motor that is mechanically strong.

대표청구항 ▼

A hydraulic motor having radial pistons and a device for selecting its active cubic capacity, the motor comprising: a cam having a plurality of undulations, each undulation comprising a crest placed between two troughs; a cylinder block mounted to rotate about an axis of rotation relative to the cam

A hydraulic motor having radial pistons and a device for selecting its active cubic capacity, the motor comprising: a cam having a plurality of undulations, each undulation comprising a crest placed between two troughs; a cylinder block mounted to rotate about an axis of rotation relative to the cam; a plurality of cylinders provided in the cylinder block, and disposed radially relative to said axis of rotation; a plurality of pistons slidably mounted inside the cylinders, each piston delimiting a fluid working chamber inside the cylinder in which it is mounted, and being urged against said cam under drive from the pressure of a fluid under pressure contained in said working chamber; a main inlet fluid enclosure for the fluid under pressure and a main outlet fluid enclosure; an internal fluid distributor co-operating with the cylinder block, while the cylinder block rotates relative to the cam, to put each working chamber into communication alternately with the main inlet enclosure and with the main outlet enclosure; a plurality of individual feed selectors disposed in the cylinder block, each individual selector being associated with a cylinder belonging to a specific group of said cylinders, and being interposed between the working chamber delimited inside said cylinder and the internal fluid distributor; and means for returning the pistons slidably mounted in the cylinders of said specific group of cylinders towards the configuration in which the pistons are retracted inside their respective cylinders; the motor being organized in such manner that firstly each individual feed selector can be placed in two specific configurations, said feed selector being coupled to a return member for returning said feed selector to one of said specific configurations, and to a control member for putting said feed selector in place in the other of said two specific configurations, said control member being connected to a control device, and having the opposite effect to that of the return member; secondly, when said individual feed selector is in said one specific configuration, the working chamber delimited inside the cylinder associated with the individual selector can, while the cylinder block is rotating relative to the cam, be put into communication alternately with the main inlet enclosure and with the main outlet enclosure via the internal fluid distributor; and thirdly, when said individual feed selector is in the other of said two specific configurations, said working chamber is isolated at least from the main inlet enclosure; wherein the control member coupled to each of said individual feed selectors can work only in a range of positions of the cylinder associated with said individual feed selector which corresponds to the axis of said cylinder being in alignment with the crest of one of said undulations of the cam, and to positions that are angularly adjacent to the position in which said alignment is obtained.