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AssigneeDrausuisse Brasil Comercio E Locacao De Unidades Hidraulicas Inteligentes S.A.
InventorErcio Miguel Nema
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The present patent of invention relates to a hydraulic unit (U) with a pneumatic cylinder (15) that works jointly with a servomotor (M), together with a ball screw (29) to together move a hydraulic piston pump (8), made up of a hydraulic plunger (7), with related sealing elements to prevent oil leaks, noise, metal-on-metal attrition and loss of efficiency, that is moved upwards and downwards using a ball screw (29) and a pneumatic cylinder (15), jointly with a servomotor (M) which, when moved, pushes the pressurized oil outwards while filling the opposite hydraulic chamber with an oil suction movement, the pumped oil entering a hydraulic pressure accumulator (25), where it remains idle to be used when required and being supplied by the up/down movement of the piston, generating continuous pumping, which is automatically stopped when the hydraulic pressure accumulator (25) is full and has reached the predetermined hydraulic pressure. With regard to the field of application, the invention is intended to be used to move hydraulic actuators in a variety of different machines and equipment.
1-10. (canceled)
A hydraulic unit with combined pneumatic/servomotor action characterized by comprising:
The hydraulic unit according to claim 1, characterized in that the pneumatic cylinder works immersed in oil from the oil reservoir, using the low temperature generated by the expansion of the compressed air in the pneumatic cylinder to automatically cool the oil contained in the oil reservoir.
The hydraulic unit according to claim 1, characterized in that the upper sensor is activated when the pneumatic plunger arrives at the end of the upward stroke, said sensor electronically controlling the inversion of the turning direction of the servomotor, thus causing the inversion in the turning direction of the ball screw, which thereafter turns counter-clockwise.
The hydraulic unit according to claim 1, characterized in that the servomotor (M) electronically monitors the need to replace oil from the pressure accumulator.
The hydraulic unit according to claim 1, characterized in that the hydraulic plunger contains sealing elements to eliminate oil leaks and loss of efficiency.
The hydraulic unit, according to claim 1, characterized by being for moving hydraulic actuators in machines or equipment.
The hydraulic unit according to claim 7, characterized in that up to 90% of the volume of oil from the reservoir is reduced.
The hydraulic unit according to claim 8, characterized by generating savings of up to 90% in electric energy.
The hydraulic unit according to claim 7, characterized by dissipating the heat of the hydraulic oil.
Dependencies are inferred from the claim text.