Patents by Inventor Zilek Liberfarb
Zilek Liberfarb has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20080017261Abstract: This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator. The cage tank ports 52 return fluid from the valve 20 to a tank from where fluid circulates back to the pump. Main spool 112 controls fluid flow between cage clutch ports 54 and cage pump ports 56 or cage tank ports 52. An electro-magnetically operated pilot valve regulates fluid pressure applied to a control pressure surface 138. A feedback pressure passage 126, having feedback restriction orifice 128, restrains the rate fluid flows between the cage clutch ports 54 and the feedback pressure surface 114.Type: ApplicationFiled: February 27, 2007Publication date: January 24, 2008Inventors: Louis Harms, Zilek Liberfarb
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Patent number: 7261030Abstract: A hydraulic circuit is disclosed that can include a flow control element, a pressure compensator connected via a pair of load sense lines to an inlet line and an outlet line, respectively, of a flow control element to provide a constant pressure drop across the flow control element, and a load sense line control valve installed in a load sense line to provide controllable resistance in a flow passage in opposite flow directions, the resistance in each flow direction being different. The load sense line control valve can include a restrictive orifice followed by a spring-loaded check valve in a first flow direction and at least one other restrictive orifice and a check valve in a second flow direction, the second flow direction opposing the first flow direction.Type: GrantFiled: September 9, 2005Date of Patent: August 28, 2007Assignee: HydraForce, Inc.Inventors: Zilek Liberfarb, Aleksandr Gershik, Michael Cannestra
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Patent number: 7063100Abstract: A flow regulator with pressure relief combination valve is disclosed which can include a housing and a valve assembly. The housing can have a chamber and four ports. A cage, having a plurality of cross holes, is supported by the housing. A hollow spool is slidably disposed within the cage and is biased to engage the cage. A shoulder of the cage and a counterbore of the spool cooperate to interferingly retain an insert. A poppet is slidably disposed inside of the cage. The valve assembly includes an adaptor, a spring disposed within the adaptor, a guide disposed between the spring and the poppet, and an adjuster adjustably secured to the adaptor. The spring is arranged to bias the poppet against a seat via the guide. The adjustor is movable to adjust the position of the spring.Type: GrantFiled: March 4, 2004Date of Patent: June 20, 2006Assignee: HydraForce Inc.Inventor: Zilek Liberfarb
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Publication number: 20060086244Abstract: A hydraulic circuit is disclosed that can include a flow control element, a pressure compensator connected via a pair of load sense lines to an inlet line and an outlet line, respectively, of a flow control element to provide a constant pressure drop across the flow control element, and a load sense line control valve installed in a load sense line to provide controllable resistance in a flow passage in opposite flow directions, the resistance in each flow direction being different. The load sense line control valve can include a restrictive orifice followed by a spring-loaded check valve in a first flow direction and at least one other restrictive orifice and a check valve in a second flow direction, the second flow direction opposing the first flow direction.Type: ApplicationFiled: September 9, 2005Publication date: April 27, 2006Applicant: HydraForce, INc.Inventors: Zilek Liberfarb, Aleksandr Gershik, Michael Cannestra
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Patent number: 6966329Abstract: A proportional, pilot-operated flow control valve is disclosed which can include a cage, a hollow compensating spool slidably disposed within the cage, a hollow metering guide member slidably disposed within the compensating spool, a regulating spool slidably disposed within the guide member, a dampening guide slidably disposed inside the compensating spool to define a dampening chamber, a compensating spring disposed inside the dampening chamber and arranged to urge the dampening guide to engage the metering guide and the compensating spool to engage the cage, a regulating spring disposed inside the regulating spool and urging the regulating spool to abut the dampening guide, and a cartridge, the cartridge having a pilot valve assembly and an adaptor, the adaptor mounted to the cage, the pilot valve assembly mounted to the adaptor, the pilot valve assembly including an actuator.Type: GrantFiled: January 26, 2004Date of Patent: November 22, 2005Assignee: HydraForce, Inc.Inventor: Zilek Liberfarb
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Publication number: 20050173008Abstract: This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator. The cage tank ports 52 return fluid from the valve 20 to a tank from where fluid circulates back to the pump. Main spool 112 controls fluid flow between cage clutch ports 54 and cage pump ports 56 or cage tank ports 52. An electro-magnetically operated pilot valve regulates fluid pressure applied to a control pressure surface 138. A feedback pressure passage 126, having feedback restriction orifice 128, restrains the rate fluid flows between the cage clutch ports 54 and the feedback pressure surface 114.Type: ApplicationFiled: February 24, 2005Publication date: August 11, 2005Inventors: Louis Harms, Zilek Liberfarb
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Patent number: 6926033Abstract: This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator. The cage tank ports 52 return fluid from the valve 20 to a tank from where fluid circulates back to the pump. Main spool 112 controls fluid flow between cage clutch ports 54 and cage pump ports 56 or cage tank ports 52. An electro-magnetically operated pilot valve regulates fluid pressure applied to a control pressure surface 138. A feedback pressure passage 126, having feedback restriction orifice 128, restrains the rate fluid flows between the cage clutch ports 54 and the feedback pressure surface 114.Type: GrantFiled: October 26, 2004Date of Patent: August 9, 2005Assignee: Parker-Hannifin Corp.Inventors: Louis C. Harms, Zilek Liberfarb
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Publication number: 20050087242Abstract: This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator. The cage tank ports 52 return fluid from the valve 20 to a tank from where fluid circulates back to the pump. Main spool 112 controls fluid flow between cage clutch ports 54 and cage pump ports 56 or cage tank ports 52. An electro-magnetically operated pilot valve regulates fluid pressure applied to a control pressure surface 138. A feedback pressure passage 126, having feedback restriction orifice 128, restrains the rate fluid flows between the cage clutch ports 54 and the feedback pressure surface 114.Type: ApplicationFiled: October 26, 2004Publication date: April 28, 2005Inventors: Louis Harms, Zilek Liberfarb
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Publication number: 20040206397Abstract: A flow regulator with pressure relief combination valve is disclosed which can include a housing and a valve assembly. The housing can have a chamber and four ports. A cage, having a plurality of cross holes, is supported by the housing. A hollow spool is slidably disposed within the cage and is biased to engage the cage. A shoulder of the cage and a counterbore of the spool cooperate to interferingly retain an insert. A poppet is slidably disposed inside of the cage. The valve assembly includes an adaptor, a spring disposed within the adaptor, a guide disposed between the spring and the poppet, and an adjuster adjustably secured to the adaptor. The spring is arranged to bias the poppet against a seat via the guide. The adjustor is movable to adjust the position of the spring.Type: ApplicationFiled: March 4, 2004Publication date: October 21, 2004Applicant: HydraForce, Inc.Inventor: Zilek Liberfarb
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Publication number: 20040154672Abstract: A proportional, pilot-operated flow control valve is disclosed which can include a cage, a hollow compensating spool slidably disposed within the cage, a hollow metering guide member slidably disposed within the compensating spool, a regulating spool slidably disposed within the guide member, a dampening guide slidably disposed inside the compensating spool to define a dampening chamber, a compensating spring disposed inside the dampening chamber and arranged to urge the dampening guide to engage the metering guide and the compensating spool to engage the cage, a regulating spring disposed inside the regulating spool and urging the regulating spool to abut the dampening guide, and a cartridge, the cartridge having a pilot valve assembly and an adaptor, the adaptor mounted to the cage, the pilot valve assembly mounted to the adaptor, the pilot valve assembly including an actuator.Type: ApplicationFiled: January 26, 2004Publication date: August 12, 2004Applicant: HydraForce, Inc.Inventor: Zilek Liberfarb
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Publication number: 20030188788Abstract: The technical field of the invention generally concerns electronically controlled hydraulic valves adapted for use in electro-hydraulically controlled automotive transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and by cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator, such as that for an automotive clutch. The cage clutch ports 54 supply the fluid at a pressure that is proportional to an electrical control signal applied to a solenoid coil 252 of the valve 20. The cage tank ports 52 return fluid from the valve 20 to a tank from which the fluid circulates back to the pump. Located in the cage 42 is a main spool 112 that is movable laterally relative to the cage 42 for controlling a flow of hydraulic fluid between the cage clutch ports 54 and either the cage pump ports 56 or the cage tank ports 52.Type: ApplicationFiled: April 2, 2003Publication date: October 9, 2003Inventors: Louis C. Harms, Zilek Liberfarb
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Patent number: 6571828Abstract: This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator. The cage tank ports 52 return fluid from the valve 20 to a tank from where fluid circulates back to the pump. Main spool 112 controls fluid flow between cage clutch ports 54 and cage pump ports 56 or cage tank ports 52. An electromagnetically operated pilot valve regulates fluid pressure applied to a control pressure surface 138. A feedback pressure passage 126, having a feedback restriction orifice 128, restrains the rate fluid flows between the cage clutch ports 54 and the feedback pressure surface 114.Type: GrantFiled: February 28, 2002Date of Patent: June 3, 2003Assignee: Parker-Hannifin CorporationInventors: Louis C. Harms, Zilek Liberfarb
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Publication number: 20020092573Abstract: The technical field of the invention generally concerns electronically controlled hydraulic valves adapted for use in electro-hydraulically controlled automotive transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and by cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator, such as that for an automotive clutch. The cage clutch ports 54 supply the fluid at a pressure that is proportional to an electrical control signal applied to a solenoid coil 252 of the valve 20. The cage tank ports 52 return fluid from the valve 20 to a tank from which the fluid circulates back to the pump. Located in the cage 42 is a main spool 112 that is movable laterally relative to the cage 42 for controlling a flow of hydraulic fluid between the cage clutch ports 54 and either the cage pump ports 56 or the cage tank ports 52.Type: ApplicationFiled: February 28, 2002Publication date: July 18, 2002Inventors: Louis C. Harms, Zilek Liberfarb
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Patent number: 6405746Abstract: This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator. The cage tank ports 52 return fluid from the valve 20 to a tank from where fluid circulates back to the pump. Main spool 112 controls fluid flow between cage clutch ports 54 and cage pump ports 56 or cage tank ports 52. An electro-magnetically operated pilot valve regulates fluid pressure applied to a control pressure surface 138. A feedback pressure passage 126, having a feedback restriction orifice 128, restrains the rate fluid flows between the cage clutch ports 54 and the feedback pressure surface 114.Type: GrantFiled: July 25, 2001Date of Patent: June 18, 2002Assignee: Parker-Hannifin CorporationInventors: Louis C. Harms, Zilek Liberfarb
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Publication number: 20010052368Abstract: The technical field of the invention generally concerns electronically controlled hydraulic valves adapted for use in electro-hydraulically controlled automotive transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and by cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator, such as that for an automotive clutch. The cage clutch ports 54 supply the fluid at a pressure that is proportional to an electrical control signal applied to a solenoid coil 252 of the valve 20. The cage tank ports 52 return fluid from the valve 20 to a tank from which the fluid circulates back to the pump. Located in the cage 42 is a main spool 112 that is movable laterally relative to the cage 42 for controlling a flow of hydraulic fluid between the cage clutch ports 54 and either the cage pump ports 56 or the cage tank ports 52.Type: ApplicationFiled: July 25, 2001Publication date: December 20, 2001Inventors: Louis C. Harms, Zilek Liberfarb
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Patent number: 6286535Abstract: The technical field of the invention generally concerns electronically controlled hydraulic valves adapted for use in electro-hydraulically controlled automotive transmissions. The proportional pressure control valve 20 includes a hollow cage 42 pierced by cage tank ports 52, cage clutch ports 54, and by cage pump ports 56. The cage pump ports 56 receive fluid from a pump. The cage clutch ports 54 supply fluid to a hydraulic actuator, such as that for an automotive clutch. The cage clutch ports 54. supply the fluid at a pressure that is proportional to an electrical control signal applied to a solenoid coil 252 of the valve 20. The cage tank ports 52 return fluid from the valve 20 to a tank from which the fluid circulates back to the pump. Located in the cage 42 is a main spool 112 that is movable laterally relative to the cage 42 for controlling a flow of hydraulic fluid between the cage clutch ports 54 and either the cage pump ports 56 or the cage tank ports 52.Type: GrantFiled: September 21, 2000Date of Patent: September 11, 2001Assignee: Parker-Hannifin CorporationInventors: Louis C. Harms, Zilek Liberfarb
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Patent number: 6167906Abstract: A bi-directional flow control valve includes a two-port housing, and a hollow cage within the housing. The hollow cage has rows of cross-sectional holes that communicate with the ports. A hollow compensating spool is slidably arranged within the hollow cage between the cross-sectional holes. Pressure differential between the ports induces movement in the compensating spool. This movement causes the compensating spool to reduce the opening of one row of cross-sectional holes and increase the opening of the other. In this manner, the valve provides consistent flow control characteristics in each flow direction.Type: GrantFiled: June 25, 1999Date of Patent: January 2, 2001Assignee: HydraForce, Inc.Inventor: Zilek Liberfarb
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Patent number: 6116263Abstract: An inventive priority flow regulator comprises a valve assembly which is supported by a housing at one end and confines an electro-magnetic actuator at the other end. The housing has an inlet port, an outlet port, and a regulated port. The valve assembly includes a hollow cage that cooperates with a cavity formed in the housing to define a plurality of internal chambers, a hollow compensating spool slidably arranged within the cage between rows of cross-sectional holes formed in the cage, a hollow guide member slidably arranged within the compensating spool and having cross-holes formed therein, and regulating and dampening spools slidably arranged within the guide member at opposite ends thereof. The internal chambers of the housing communicate with respective ports formed in the housing to provide a priority flow configuration as well as a reverse flow configuration.Type: GrantFiled: September 7, 1999Date of Patent: September 12, 2000Assignee: HydraForce, Inc.Inventor: Zilek Liberfarb
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Patent number: 5836335Abstract: The technical field of the invention generally concerns electronically controlled valves for use in electro-hydraulically controlled transmissions. The valve 20 includes a hollow cage 42 pierced by tank ports 52, clutch ports 54, and by pump ports 56. The pump ports 56 receive fluid from a pump. The clutch ports 54 supply fluid to a hydraulic actuator. The cage clutch ports 54 supply fluid at a pressure that is proportional to an electrical control signal applied to a coil 252 of the valve 20. The tank ports 52 return fluid from the valve 20 to a tank. Located in the cage 42 is a main spool 112 that moves laterally relative to the cage 42 for controlling a flow of hydraulic fluid between the clutch ports 54 and either the pump ports 56 or the tank ports 52. An electro-magnetically operated pilot valve regulates a control pressure of fluid applied to a control pressure surface 138 at one end of the main spool 112.Type: GrantFiled: February 8, 1996Date of Patent: November 17, 1998Assignee: Fluid Power Industries, Inc.Inventors: Louis C. Harms, Zilek Liberfarb
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Patent number: 5564676Abstract: A solenoid valve assembly, subject to high vibration and shock induced loading, providing both axial and radial motion restraint of critical valve structures as economical means for achieving structural integrity.Type: GrantFiled: August 14, 1995Date of Patent: October 15, 1996Assignee: Fluid Power Industries, Inc.Inventors: C. Nickolas Goloff, Joseph Reilly, Ronald E. Trost, Zilek Liberfarb