US 11,814,814 B2
Hydraulic system for hydro-mechanical machines comprising rotary mechanism and boom cylinder
Atul Chandra Tripathi, Noida (IN); and Shailendra J Shrivastava, Bangalore (IN)
Assigned to L&T TECHNOLOGY SERVICES LIMITED, Chennai (IN)
Appl. No. 17/720,349
Filed by L&T TECHNOLOGY SERVICES LIMITED, Chennai (IN)
PCT Filed Mar. 18, 2020, PCT No. PCT/IB2020/052443
§ 371(c)(1), (2) Date Apr. 14, 2022,
PCT Pub. No. WO2021/090076, PCT Pub. Date May 14, 2021.
Claims priority of application No. 201941045055 (IN), filed on Nov. 6, 2019.
Prior Publication US 2022/0397133 A1, Dec. 15, 2022
Int. Cl. E02F 9/22 (2006.01); F15B 1/02 (2006.01); F15B 21/14 (2006.01); F15B 15/22 (2006.01)
CPC E02F 9/2217 (2013.01) [E02F 9/2203 (2013.01); F15B 1/024 (2013.01); F15B 15/22 (2013.01); F15B 21/14 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/6306 (2013.01); F15B 2211/7135 (2013.01); F15B 2211/761 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A hydraulic system for a hydro-mechanical machine comprising a rotary mechanism and a boom cylinder, the hydraulic system comprising:
a primary accumulator configured to receive and store high-pressure fluid in response to starting and stopping of the rotary mechanism;
a control system coupled to the primary accumulator through a hydraulic supply circuit, wherein the control system is configured to enable passage of the high-pressure fluid stored in the primary accumulator to a rotary control valve operated by a swing controller configured to control the rotary mechanism, a boom control valve operated by a boom controller configured to control the boom cylinder through the hydraulic supply circuit, based on a predefined pressure threshold associated with the primary accumulator;
a direction control valve configured to enable passage of the high-pressure fluid from the primary accumulator to the rotary control valve, the rotary mechanism, the boom control valve, and the boom cylinder in the hydraulic supply circuit, based on initiation or control by at least one of the swing controller, the boom controller and commanded by the control system, when pressure in a fluid supply line of the rotary control valve or the boom control valve is less than the pressure of the high-pressure fluid in the primary accumulator;
wherein the swing controller and the boom controller commanded by the control system are further configured to enable passage of the high-pressure fluid from the primary accumulator to the rotary control valve, the boom control valve, or to control valves of the hydro mechanical machine, through a secondary pump system in the hydraulic supply circuit, when pressure in a fluid supply line of the rotary control valve or the boom control valve is greater than or equal to the fluid pressure in the primary accumulator;
wherein the secondary pump system comprises:
a hydraulic motor configured to convert hydraulic energy of the fluid from the primary accumulator into mechanical energy;
a hydraulic pump coupled to the hydraulic motor, wherein the hydraulic motor drives the hydraulic pump, wherein each of the hydraulic motor and the hydraulic pump is one of a fixed displacement type and a variable displacement type; and
a flow control valve in a line supplying fluid from the direction control valve to the hydraulic motor of the secondary pump system, to regulate the fluid supply, wherein the flow control valve is one of a fixed setting type, a variable setting type, an electronic control type, a temperature compensated type, or a physical parameter compensation type; and
a secondary accumulator coupled to the primary accumulator and operated by at least one of the swing controller and the boom controller and commanded via the control system and the hydraulic supply circuit, wherein the secondary accumulator is configured to store surplus high-pressure fluid provided by the primary accumulator through the hydraulic supply circuit.
 
9. A hydraulic system for a hydro-mechanical machine comprising a rotary mechanism and a boom cylinder, the hydraulic system comprising:
a primary accumulator configured to:
receive high-pressure fluid in response to starting and stopping of the rotary mechanism;
temporarily store the high-pressure fluid; and
provide the high-pressure fluid to a rotary control valve configured to control the rotary mechanism, and to a boom control valve configured to control the boom cylinder through a hydraulic supply circuit, based on a predefined pressure threshold associated with the primary accumulator;
a control system coupled to the primary accumulator through a hydraulic supply circuit;
a swing controller and a boom controller commanded by the control system are configured to enable passage of the high-pressure fluid from the primary accumulator to the rotary control valve, the boom control valve, or to control valves of the hydro mechanical machine, through a secondary pump system in the hydraulic supply circuit, when pressure in a fluid supply line of the rotary control valve or the boom control valve is greater than or equal to fluid pressure in the primary accumulator;
a direction control valve configured to enable passage of the high-pressure fluid from the primary accumulator to the rotary control valve, the rotary mechanism, the boom control valve, and the boom cylinder in the hydraulic supply circuit, based on initiation or control by at least one of the swing controller, the boom controller and commanded by the control system, when pressure in a fluid supply line of the rotary control valve or the boom control valve is less than the pressure of the high-pressure fluid in the primary accumulator;
wherein the secondary pump system comprises:
a hydraulic motor configured to convert hydraulic energy of the fluid from the primary accumulator into mechanical energy;
a hydraulic pump coupled to the hydraulic motor, wherein the hydraulic motor drives the hydraulic pump, wherein each of the hydraulic motor and the hydraulic pump is one of a fixed displacement type and a variable displacement type; and
a flow control valve in a line supplying fluid from the direction control valve to the hydraulic motor of the secondary pump system, to regulate the fluid supply, wherein the flow control valve is one of a fixed setting type, a variable setting type, an electronic control type, a temperature compensated type, or a physical parameter compensation type; and
a secondary accumulator coupled to the primary accumulator via the hydraulic supply circuit, wherein the secondary accumulator is configured to store surplus high-pressure fluid provided by the primary accumulator in the hydraulic supply circuit.
 
11. A hydraulic system for an off-highway machine comprising a swing motor and a boom cylinder, the hydraulic system comprising:
a primary accumulator configured to receive and store high-pressure fluid in response to starting and stopping of the swing motor;
a control system, via a swing controller, coupled to the primary accumulator through a hydraulic supply circuit, wherein the control system is operated by the swing controller and a boom controller and is configured to enable passage of the high-pressure fluid stored in the primary accumulator to a rotary control valve configured to control the swing motor, a boom control valve to control the boom cylinder through the hydraulic supply circuit, based on a predefined pressure threshold associated with the primary accumulator;
a direction control valve configured to enable passage of the high-pressure fluid from the primary accumulator to the rotary control valve, the swing motor, the boom control valve, and the boom cylinder in the hydraulic supply circuit, based on initiation or control by at least one of the swing controller, the boom controller and commanded by the control system, when pressure in a fluid supply line of the rotary control valve or the boom control valve is less than the pressure of the high-pressure fluid in the primary accumulator;
wherein the swing controller and the boom controller commanded by the control system are further configured to enable passage of the high-pressure fluid from the primary accumulator to the rotary control valve, the boom control valve, or to control valves of the hydraulic mechanical machine, through a secondary pump system in the hydraulic supply circuit, when pressure in a fluid supply line of the rotary control valve or the boom control valve is greater than or equal to the fluid pressure in the primary accumulator;
wherein the secondary pump system comprises:
a hydraulic motor configured to convert hydraulic energy of the fluid from the primary accumulator into mechanical energy;
a hydraulic pump coupled to the hydraulic motor, wherein the hydraulic motor drives the hydraulic pump, wherein each of the hydraulic motor and the hydraulic pump is one of a fixed displacement type and a variable displacement type; and
a flow control valve in a line supplying fluid from the direction control valve to the hydraulic motor of the secondary pump system, to regulate the fluid supply, wherein the flow control valve is one of a fixed setting type, a variable setting type, an electronic control type, a temperature compensated type, or a physical parameter compensation type; and
a secondary accumulator coupled to the primary accumulator and the control system via the hydraulic supply circuit, wherein the secondary accumulator is configured to store surplus high-pressure fluid provided by the primary accumulator through the hydraulic supply circuit.