Hydraulic unit with sequential piston pumps operated by rolling weights

Abstract

The present patent of invention refers to a hydraulic unit (U) that uses at least one rolling weight (8) having radial movement, connected to a drive shaft (3) moved by at least one servomotor (1), in order to exert the force, favored by the action of gravity, on the hydraulic pistons (11) of sequential pumps positioned on a circular track (12), which force can be enhanced by the activation of a pneumatic cylinder (13), the speed of the servomotor (1) or the quantity of rolling weights (8), thereby obtaining volumes of pressurized hydraulic oil, using small/low-power electric motors.

1 . A HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, comprising at least one upper servomotor ( 1 ) which activates a speed reducer ( 2 ) which has the function of turning a drive shaft ( 3 ), in the vertical position, supported and guided on an upper bearing ( 4 ) and on a lower bearing ( 5 ), in addition to a safety system, wherein the drive shaft ( 3 ) derives at least one conductor shaft ( 6 ), fastened thereon in a swivel joint ( 7 ), at whose distal end there is prominently at least one rolling weight ( 8 ) in disk form, of known magnitude, seated on bearings ( 10 ): in rotating, the rolling weight ( 8 ) exerts a force, making use of the action of gravity, on the hydraulic pistons ( 11 ) of the sequential pumps supported on a circular track ( 12 ): the force exerted on the hydraulic pistons ( 11 ) can be enhanced by the action of at least one pneumatic cylinder ( 13 ) mounted at the end of a support ( 14 ) equally connected to the drive shaft ( 3 ), by the very rotation of the servomotor ( 1 ) and by the quantity of rolling weights: the hydraulic unit suctions the oil from the reservoir ( 15 ) and when the rolling weight ( 8 ) passes by the hydraulic piston ( 11 ) it displaces the volume of oil accumulated in its chamber ( 16 ) to the hydraulic ring ( 11 ) ( 17 ), pressure chamber ( 18 ), output connection ( 19 ) and external connection ( 20 ) to the user's manifold ( 21 ) at a high pressure and outflow. 
     
     
         2 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 1 , wherein the support ( 14 ) of the pneumatic cylinder ( 13 ) and the conductor shaft ( 6 ) of the hydraulic pistons ( 11 ) rotate in solidarity with each other around the drive shaft ( 3 ) travelling the circuit of the circular track ( 12 ). 
     
     
         3 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 1 , wherein the rolling weight ( 8 ) is conducted in the radial direction and moves supported by the bearings ( 10 ) at the end of the conductor shaft ( 6 ). 
     
     
         4 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 1 , wherein the enhancement of the force applied, increased or decreased by means of the pneumatic cylinder ( 13 ), occurs by action of a pneumatic directional valve ( 22 ) which is powered by a source of compressed air ( 23 ). 
     
     
         5 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 4 , wherein the pneumatic directional valve ( 22 ) directs the compressed air to the upper pneumatic chamber ( 24 ), or to the lower pneumatic chamber ( 25 ). 
     
     
         6 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 1 , wherein the rolling weight ( 8 ) upon reaching the centerline of the shaft of the hydraulic piston ( 11 ), displaces it downwards compressing the spring ( 26 ) of the hydraulic piston ( 11 ): the volume of oil that is in the chamber ( 16 ) is directed to the pressure chamber ( 18 ) of the hydraulic ring ( 11 ) ( 17 ), through the guide pipe ( 27 ) of pressurized oil, after opening the hydraulic check valve ( 28 ): the rolling weight ( 8 ) upon leaving from the top of the hydraulic piston ( 11 ) enables the spring ( 26 ) to start the displacement thereof upwards, suctioning hydraulic oil from the reservoir ( 15 ) through the suction pipe ( 29 ). 
     
     
         7 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 6 , wherein the rolling weight ( 8 ) in pressing the hydraulic piston ( 11 ) makes the oil in the hydraulic chamber ( 16 ) move and starts opening the hydraulic check valve ( 28 ), enabling this oil to move through the guide pipe ( 27 ) of pressurized oil and reach the hydraulic ring ( 17 ) continuing to move through its pressure chamber ( 18 ), reaching the output connection ( 19 ) of the hydraulic ring ( 11 ), passing through the hydraulic oil output pipe ( 30 ) arriving at the external oil pressure connection ( 17 ) and being conducted to the user's manifold block ( 21 ). 
     
     
         8 . The HYDRAULIC UNIT WITH SEQUENTIAL PISTON PUMPS OPERATED BY ROLLING WEIGHTS, according to  claim 1 , wherein the safety system, by means of an external command, changes the position of the pneumatic directional valve ( 22 ) reversing the position of the air in the pneumatic chambers of the pneumatic cylinder ( 13 ) resulting in raising the rolling weight ( 8 ) by means of its conductor shaft ( 6 ).