| 摘要 |
A hydraulic motor is provided having radial pistons, with a cylinder block, two main ducts, a fluid distributor, one distribution valve per cylinder, and a control system for controlling the distribution valves. The motor includes at least two elementary motors, and can operate in various different states in which, in each elementary motor, each of the cylinders is connected on the rising ramps to a second main duct and on the falling ramps to a second main duct; a first elementary motor being driving in a first state, and inactive or opposing in a second state, the control system operating the remainder of the hydraulic motor in the same way in these two states. A hydraulic circuit including said motor and a method of controlling such a motor are also provided. |
| 主权项 |
1. A hydraulic motor having radial pistons, and including:
a cylinder block, in which each cylinder has a chamber in which a piston is mounted to slide; a cam, on which each of the pistons can exert pressure in order to generate torque, the cam having at least two lobes, each lobe having a rising ramp and a falling ramp, the cylinder block being mounted to rotate relative to the cam; at least two main ducts, via which the hydraulic motor can receive or send fluid, a fluid distributor for distributing the fluid from said main ducts to the cylinders, which distributor includes, for each cylinder, a distribution valve configured to connect the chamber of the cylinder to one or the other of said main ducts, so as to enable fluid to enter into or to exit from said chamber; and a control system including an angular position sensor for sensing the angular position of the cam relative to the cylinder block, for controlling the distribution valves wherein: a) the hydraulic motor includes at least two elementary motors, wherein, with the lobes being distributed in one or more groups of lobes and the cylinders being distributed in one or more groups of cylinders, each elementary motor is defined by a group of cylinders and by a group of lobes, and includes those of the cylinders of the group of cylinders that act on the lobes of the group of lobes, the elementary motor being, due to the arrangement of the group of cylinders and the group of lobes that define it, capable of delivering torque regardless of the angular position of the cam relative to the cylinder block; b) the control system operates the distribution valves such that the hydraulic motor has a plurality of operation modes, in which operation modes, in each elementary motor, each of the cylinders is put into communication on the rising ramps with a first main duct and on the falling ramps with a second main duct, any changes to these communications taking place when the cylinder passes substantially facing a top or bottom dead center, on the basis of the information delivered by the angular position sensor; and c) a first elementary motor of the at least two elementary motors is driving when the hydraulic motor is in a first one of said operating modes, and is inactive or opposing when said hydraulic motor is in a second one of said operating modes, the control system operating the remainder of the hydraulic motor in the same way in said first and second operating modes. |
