Hydraulic motor with radial pistons and control by cylinder
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01B-013/04
F03C-001/30
F03C-001/40
F03C-001/24
F03C-001/247
F03C-001/26
출원번호
US-0142521
(2009-12-30)
등록번호
US-9074578
(2015-07-07)
우선권정보
FR-0859172 (2008-12-31)
국제출원번호
PCT/FR2009/052720
(2009-12-30)
§371/§102 date
20111024
(20111024)
국제공개번호
WO2010/076543
(2010-07-08)
발명자
/ 주소
Souply, Jean-Pierre
Charrier, Guillaume
Lemaire, Gilles
출원인 / 주소
POCLAIN HYDRAULICS INDUSTRIE
대리인 / 주소
Ladas & Parry LLP
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
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
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.
대표청구항▼
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 ram
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; anda 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; andc) 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. 2. A hydraulic motor according to claim 1, wherein, when the hydraulic motor is in said operating modes, a single group of lobes is defined, in such manner that each elementary motor includes all of the lobes of the cam. 3. A hydraulic motor according to claim 1, wherein, when the hydraulic motor is in said operating modes, a single group of cylinders is defined, in such manner that each elementary motor includes all of the cylinders. 4. A hydraulic motor according to claim 1, wherein the first elementary motor has a cylinder capacity that is different from the cylinder capacity of another elementary motor. 5. A hydraulic motor according to claim 1, wherein the control system includes an activation table that indicates and makes it possible to determine the operating modes of the various elementary motors as a function of a desired cylinder capacity, each operating mode being chosen from among drive, opposing, and inactive. 6. A hydraulic motor according to claim 1, wherein the control system automatically effects a plurality of cylinder capacity changes in a predefined order, as a function at least of a speed of rotation of the hydraulic motor and of a speed or acceleration setpoint transmitted to the hydraulic motor. 7. A hydraulic motor according to claim 1, wherein, when the hydraulic motor is in one of said states, the control system operates the distribution valves, in such a manner that two elementary motors exert torque in opposite directions. 8. A hydraulic motor according to claim 1, wherein the elementary motors are constant-velocity motors. 9. A hydraulic motor according to claim 1, wherein the fluid distributor has, for at least one elementary motor, inactivation means connecting said elementary motor in a continuous manner to the main duct having a pressure chosen from among the lower pressure and the higher pressure of the main ducts. 10. A hydraulic motor according to claim 9, wherein the inactivation means include means for detecting the direction of rotation of the hydraulic motor, said chosen pressure being selected as a function of the direction of rotation of the hydraulic motor and of the direction of a speed command or of an acceleration command that is applied to the hydraulic motor. 11. A hydraulic motor according to claim 1, wherein, at least for one elementary motor, the pistons are retractable, such that they are disengaged from the cam. 12. A hydraulic motor according to claim 1, wherein, when the hydraulic motor is in said states, the control system is suitable for operating the distribution valves in such a manner as to revert the direction of rotation of an outlet member of the hydraulic motor without reversing the input and output directions in which the fluid is input and output in the hydraulic motor. 13. A hydraulic motor according to claim 1, wherein, when the hydraulic motor is in said operating modes, the control system operates the distribution valves in such a manner as to maintain the direction of rotation of an outlet member of the motor constant, during a reversal of input and output directions in which the fluid is input and output through the hydraulic motor. 14. A hydraulic motor according claim 1, wherein the fluid distributor is disposed substantially along the axis of rotation over the cylinder block. 15. A hydraulic circuit comprising: at least one first hydraulic motor according to claim 1, coupled to a first movement member for moving a vehicle; andat least one second hydraulic motor, coupled to a second movement member for moving a vehicle;the control system of the first motor being capable of causing the first motor and thus the first movement member to rotate at a different speed or in an opposite direction relative to the speed and direction of the second movement member. 16. A hydraulic circuit comprising at least one hydraulic motor according to claim 1, and at least two pressure accumulators, connected to two main ducts of the hydraulic motor; the hydraulic motor comprising:two first main ducts connected to the two pressure accumulators;two second main ducts connected to the main orifices of a pressurized fluid source other than said pressure accumulators;a first group of at least one elementary motor, the distribution valves of which are suitable for connecting the cylinders of said at least one elementary motor of the group to said first main ducts;a second group of at least one elementary motor, the distribution valves of which are suitable for connecting the cylinders of the at least one elementary motor of the group to said second main ducts. 17. A method of controlling a hydraulic motor having radial pistons, said hydraulic motor comprising: 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 suitable 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; anda 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;the hydraulic motor including at least two elementary motors;the method comprising:the hydraulic motor is operated in at least a first and a second operating state by means of the distribution valves;in each of said states, 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;in the first state, a first elementary motor is driving; and in the second state, the first elementary motor is inactive or opposingthe control system operating the remainder of the hydraulic motor in the same way in said first and operation modes. 18. A hydraulic motor according to claim 9, wherein the inactivation means includes pressure sensors detecting which of the at least two main ducts is at a lower pressure.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (6)
Lemaire, Gilles G; Souply, Jean-Pierre Adrien, Device for managing the displacement of a hydraulic motor or a group of hydraulic motors.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.