Class / Patent application number | Description | Number of patent applications / Date published |
417213000 | Having condition responsive pumped fluid control | 34 |
20080232978 | VARIABLE DISPLACEMENT VANE PUMP - A variable displacement vane pump, including a pump body, a driving shaft, a rotor, a cam ring swingable on a swing support surface, first and second plate members on opposite sides of the cam ring, a suction port and a discharge port on a side of at least one of the first and second plate members, a seal cooperating with the swing support surface to divide a space on an outer circumferential side of the cam ring into first and second fluid pressure chambers, a fluid pressure control valve, a stop disposed on the pump body on a side of the first fluid pressure chamber and restricting a swing movement of the cam ring, and a detent disposed between the cam ring and the pump body on a side of the second fluid pressure chamber and preventing a rotational movement of the cam ring around the driving shaft. | 09-25-2008 |
20090081052 | VARIABLE DISPLACEMENT PUMP - A variable displacement pump includes: a pump body; a rotor; a cam ring; inlet and outlet ports; first and second fluid pressure chambers; a metering orifice provided in a discharge passage connected with the outlet port; a pressure regulating section arranged to regulate the pressure introduced into the first or second fluid pressure chamber, and including a high pressure chamber, a middle pressure chamber, and a low pressure chamber; a relief valve; a pilot orifice provided in a passage connecting the metering orifice and the middle pressure chamber, and having a circular section with a diameter of a mm; and a damper orifice provided in a passage connecting the outlet port and the high pressure chamber, and having a circular section with a diameter of b mm. The pilot orifice and the damper orifice satisfy the following relationships: a+2b−2.1≧0, −4a+b−16.3≦0, and a≦1.8. | 03-26-2009 |
20090123300 | System and method for controlling a variable displacement compressor - A system and method for controlling the displacement of a variable displacement compressor by feeding back crankcase pressure as part of a control scheme is disclosed. | 05-14-2009 |
20090208348 | Capacity varying device for scroll compressor - A capacity varying device for a scroll compressor is provided. The device may include a fixed scroll and an orbiting scroll both located in a casing, a low pressure passage formed by an orbiting motion of the orbiting scroll that communicates with a suction side, an intermediate pressure passage formed by the orbiting motion of the orbiting scroll that communicates with an intermediate pressure side, a rotating device rotatably coupled to the fixed scroll and having a connection passage therein, and an operating device mounted at the fixed scroll and configured to rotate the rotating device such that the low pressure passage and the intermediate pressure passage are connected/disconnected to/from each other via the connection passage of the rotating device. Accordingly, a capacity for compressing gas may be varied, a size of the device may be reduced due to a compact configuration and structure for varying the capacity, and also a fast response to the varying of the capacity may be provided. | 08-20-2009 |
20100028168 | Drive unit and vehicle - A drive unit that includes a solenoid device that includes: a solenoid section having a movable portion that abuts on a case to arrive at an initial state when de-energized; a pump section axially sliding in association with a movement of the movable portion by an electromagnetic force of the solenoid section and pumping a hydraulic fluid by reciprocation; and an elastic member biasing the pump section in a direction counter to the electromagnetic force of the solenoid section; and a control unit that controls the solenoid device so that a current applied to the solenoid section is repeatedly increased and decreased between an upper limit value and a lower limit value that is greater than 0. | 02-04-2010 |
20100047084 | FUEL PUMP DEVICE - A fuel pump device includes a fuel pump in which pressure-generating components in the form of a movable piston movable through a cylinder in the fuel pump together are operable to pressurize the fuel in a chamber exposed to the components to high pressure. To prevent the clearance between the pressure-generating components from increasing with increased heating of the fuel pump and to maintain a predetermined clearance between the piston and the surrounding cylinder, a temperature-regulator maintains a temperature within a predetermined temperature range in a region of the fuel pump which includes the clearance and at least portions of the pressure-generating components. | 02-25-2010 |
20100260619 | Displacement Control System for Variable Displacement Compressor - A displacement control system (A) of a variable displacement compressor comprises a target pressure setting means ( | 10-14-2010 |
20100303643 | Fan Drive System - A fan drive system for driving an engine cooling fan mounted in a working machine is described. The fan drive system includes a variable displacement pump that supplies oil to an actuator and is also used as a hydraulic pump for the hydraulic motor that drives the cooling fan. A pump displacement of a variable displacement pump can be controlled in accordance with the load of the working machine, and when a load is not generated in the working machine, the pump displacement of the variable displacement pump can be controlled in accordance with a load pressure of a hydraulic motor which drives a cooling fan. Examples of such working machines include a forklift, a skid steer loader (SSL) and a crawler dump. | 12-02-2010 |
20100322787 | ELECTRONIC CLUTCH FOR A WATER PUMP - The present invention relates to an electronic clutch for a water pump which is able to break the transmission of drive force between a pulley and a water pump drive shaft in accordance with the temperature of the cooling water in an engine. A characterizing feature of the present invention is that it is arranged in such a way that, when the temperature of the cooling water is above a reference value, the water pump is engaged in operation by transmitting, to the drive shaft, the drive force of the pulley through contact between the two surfaces of a disk by means of a screw in the case of a main clutch and a clutch pulley by means of a spring, whereas, when the temperature of the cooling water is below the reference value, the operation of the water pump can be halted by supplying electricity to a coil, causing the main clutch to separate from the disk by means of the screw while the clutch pulley is in contact with the coil, and interrupting the transmission of the drive force of the pulley to the drive shaft. | 12-23-2010 |
20110020146 | ROTATION DRIVE CONTROLLING SYSTEM FOR CONSTRUCTION MACHINE - The system includes: a variable displacement hydraulic pump supplying pressure oil to a hydraulic actuator; a pressure detector detecting a pump discharge pressure from the hydraulic pump; a control valve controlling a supply of the pressure oil to the hydraulic actuator; a controller controlling a pump displacement of the hydraulic pump; a hydraulic motor rotating an upper structure of the construction machine; a swing relief valve defining a relief pressure of the hydraulic motor; and a control lever switching a control valve for the hydraulic motor. The controller includes: an adjuster that, when a pump discharge pressure detected by the pressure detector exceeds a first set value, conducts an adjustment to reduce the pump displacement; and a canceller that cancels the adjustment when the pump discharge pressure falls below a second set value. The second set value is equal to or larger than the first set value. | 01-27-2011 |
20110076160 | CONTROL DEVICE FOR A HYDRAULIC PISTON MACHINE WITH A VARIABLE FLOW RATE - A control device for a hydraulic piston machine with a variable flow rate averaged over time has a plurality of pistons each defining a working chamber with a changeable value and connectable to high-pressure and low-pressure line via first and second valves actuable in an electric fashion, and an electronic control unit operating the valves in several modes, so that the valves can be operatable only in the partial stroke mode, or in the partial stroke mode and in the idle stroke mode, or in the partial stroke mode and in the full stroke mode, or in the way that all three modes are used on a limited number of working chambers and only the idle stroke and the full stroke modes are used on the remaining working chambers. | 03-31-2011 |
20110076161 | Displacement Control System for Variable Displacement Compressor - A displacement control system (B) for a variable displacement compressor has an electromagnetic clutch ( | 03-31-2011 |
20110085921 | Apparatus Having Control Valve and Variable Capacitance Pump and Hydraulic Pressure Circuit of Internal Combustion Engine in which the Same Apparatus is Used - In a hydraulic pressure circuit including an introduction section through which oil is introduced, a main passage section installed at a downstream side of the introduction section to be communicated with a supply section through which oil is supplied to each of slide sections of an internal combustion engine, a branch passage branched from the main passage section to supply oil to a hydraulic pressure actuator, and a control valve having a valve body which is moved in accordance with a pressure of an upstream side thereof, and a variable capacitance pump configured to drain oil to the introduction section, the variable capacitance pump is configured to vary a drained flow quantity in accordance with the drained pressure of oil and a pressure under which the oil drained flow quantity is started to be varied is higher than a pressure under which the valve body is started to move. | 04-14-2011 |
20110142688 | MEMS FLUID PUMP WITH INTEGRATED PRESSURE SENSOR FOR DYSFUNCTION DETECTION - The invention relates to a pumping device including a pump ( | 06-16-2011 |
20110256000 | LOCAL BACKUP HYDRAULIC ACTUATOR FOR AIRCRAFT CONTROL SYSTEMS - A backup system is provided that has a local electric motor and pump for some or all of hydraulic actuators. A local backup hydraulic actuator has two power sources, hydraulic as primary and electrical as backup. During normal operation, the hydraulic actuator receives pressurized fluid from a hydraulic system and the fluid flow to the chambers is controlled by a servo valve. If the hydraulic system fails, the electronic controller detects the failure by observing the signal indicative of the pressure from the pressure sensor, and the controller powers the local hydraulic pump to provide high pressure hydraulic fluid to the hydraulic actuator via the servo valve. | 10-20-2011 |
20110262286 | SUCTION DEVICE - A suction device comprises a first element, a second element, and an intermediate element. The first element comprises a first control volume having a first pressure. The second element comprises a second control volume having a second pressure. The intermediate element is controlled by the first pressure of the first control volume of the first element and the second pressure of the second control volume of the second element. When the first control volume of the first element is varied, the varied first control volume of the first element can substantially have the first pressure under automatic pressure compensation by the second pressure of the second control volume of the second element via the intermediate element. | 10-27-2011 |
20110268587 | CONTROL OF A FLUID PUMP ASSEMBLY - A pump control assembly includes a fluid pump assembly having a fluid pump and a load sensing valve. The fluid pump includes a fluid inlet and a fluid outlet. The fluid pump includes a variable displacement mechanism. The load sensing valve is adapted to adjust the position of the variable displacement mechanism. The load sensing valve includes a first end and an oppositely disposed second end. An actuator is in fluid communication with the fluid pump assembly. A position sensor monitors the position of the actuator. A ramping valve provides selective fluid communication between the fluid outlet of the fluid pump and the first end of the load sensing valve. An electronic control unit is in electrical communication with the position sensor and the ramping valve. The electronic control unit transmits an output current to the ramping valve in response to the position of the actuator. | 11-03-2011 |
20110268588 | CONTROLLER OF HYBRID CONSTRUCTION MACHINE - Discharge energy of a rotation motor RM and a boom cylinder BC are used as an assist force for an electric motor MG. An assist motor AM and a sub pump SP driven by output of the electric motor MG are integrally rotated on the discharge side of main pumps MP1, MP2. The assist motor AM is rotated by the discharge energy of the rotation motor RM and the boom cylinder BC, and the driving force of the assist motor AM is used to assist the output of the electric motor MG. | 11-03-2011 |
20110286862 | PUMP FOR A LUBRICATING SYSTEM OF A COMBUSTION ENGINE - A pump is provided for a lubricating system of a combustion engine that includes, but is not limited to a housing and a lid that together define a pump hollow space in which a pump mechanism for the pumping of lubricant of the lubricating system is arranged. The pump hollow space includes, but is not limited to at least one intake opening and at least one discharge opening. The pump additionally includes, but is not limited to a regulating valve for regulating a flow of the lubricant through the pump, which is integrated in the lid. | 11-24-2011 |
20120134854 | Differential pressure control valve and variable displacement compressor having the differential pressure control valve - A differential pressure control valve has a valve seat made of magnetic material, a valve body having a lid made of magnetic material, and a guiding member. Fluid passes through a valve hole formed in the seat. The body on the downstream side of the seat separates from or is seated on the seat in accordance with the pressure difference between the upstream and downstream sides to selectively open and close the hole. The guiding member fixed to the seat guides the body. The lid is seated on the seat to close the hole. A guided member is made of nonmagnetic material. One of the seat and the lid has a permanent magnet. The body is urged in the direction approaching the seat by the force of the magnet located at a position outside the area where the body is seated on the seat. | 05-31-2012 |
20120251342 | Control System and Method for Pump Output Pressure Control - A pump system includes pump having a control feature which, responsive to a supply of pressurized working fluid, reduces the pressure of the working fluid pressurized by the pump. The control feature is connected to the output of the pump by a regulating valve. The control feature receives pressurized working fluid to decrease the output of the pump in response to the pressure of the supplied working fluid. A regulating valve selectively connects the pressurized working fluid to the control feature. The regulating valve has a control port to receive pressurized working fluid from the pump to urge the valve to a closed position against a biasing force. A controllable valve is operable to interrupt the supply of pressurized working fluid to control port to alter the output pressure of the pump. | 10-04-2012 |
20130121852 | SYSTEM FOR CONTROLLING HYDRAULIC PUMP IN CONSTRUCTION MACHINE - Disclosed is a system for controlling a hydraulic pump in a construction machine which can reduce the discharge flow of the hydraulic pump in proportion to the load pressure of the hydraulic pump to enhance operability by the driver. The present invention provides the system for controlling the hydraulic pump in the construction machine, which is characterized by detecting the discharge pressure of the hydraulic pump and the operation activity of an operation lever, and comparing the detected discharge pressure of the hydraulic pump and a predetermined pressure value, and when the detected discharge pressure exceeds the predetermined pressure value, the maximum dischargeable flow of the hydraulic pump is reduced in proportion to the difference between the detected pressure and the predetermined pressure value. | 05-16-2013 |
20130189126 | HYDRAULIC CONTROL CIRCUIT - The present invention relates to a hydraulic circuit including: a variable displacement pump, a booster pump, a pump control controlling the displacement of the variable displacement pump, supplied by the booster pump via pressure control means, the pump control including a double-acting cylinder including a first chamber and a second chamber, wherein the first chamber is connected to said booster pump via a first setting line including pressure reducing means, the second chamber is connected to said booster pump via a second setting line including a proportional pressure reducer, such that control of the proportional pressure reducer controls the displacement of the variable displacement pump. | 07-25-2013 |
20130336812 | HYDRAULIC DRIVE - A hydraulic drive for a hydraulic load or for a hydraulic system includes a variable-displacement pump which is mechanically coupled to a variable-speed drive motor. The hydraulic drive also includes a control configured to adjust at least the capacity of the pump and optionally the speed of the drive motor. The hydraulic drive also includes a torque detecting device configured to detect or calculate a current output torque of the drive motor. Based on the current output torque of the drive motor, the capacity of the pump is set to a value at which the current output torque is at or below a set maximum value. | 12-19-2013 |
20140154104 | Hydrostatic Positive Displacement Machine - A hydrostatic positive displacement machine ( | 06-05-2014 |
20140234128 | Apparatus Having Control Valve and Variable Capacitance Pump and Hydraulic Pressure Circuit of Internal Combustion Engine in which the Same Apparatus is Used - In a hydraulic pressure circuit including an introduction section through which oil is introduced, a main passage section installed at a downstream side of the introduction section to be communicated with a supply section through which oil is supplied to each of slide sections of an internal combustion engine, a branch passage branched from the main passage section to supply oil to a hydraulic pressure actuator, and a control valve having a valve body which is moved in accordance with a pressure of an upstream side thereof, and a variable capacitance pump configured to drain oil to the introduction section, the variable capacitance pump is configured to vary a drained flow quantity in accordance with the drained pressure of oil and a pressure under which the oil drained flow quantity is started to be varied is higher than a pressure under which the valve body is started to move. | 08-21-2014 |
20140294610 | PERISTALTIC PUMP FOR PUMPING A LIQUID AND METHOD FOR OPERATING A PERISTALTIC PUMP - A peristaltic pump ( | 10-02-2014 |
20140377086 | AIR-DRIVEN PUMP SYSTEM - An air-driven pump system comprising: a directional unit that defines a directional air chamber and comprises a directional piston, a first process air intake, and a second process air intake; two pump units each including a liquid chamber, an air chamber, and a piston; a shaft affixed to the pistons; an efficiency valve system comprising an efficiency piston, wherein the efficiency unit is configured to divide inlet air entering the air-driven piston pump into control air, first process air, and second process air, and wherein the efficiency piston is in communication with the control air, first process air, and second process air before the air is distributed to the directional unit; and a second shaft which is in communication with the efficiency piston. The efficiency valve system is to prevent overfilling of the air chambers. | 12-25-2014 |
20150044065 | VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR - A variable displacement swash plate type compressor includes a displacement control valve. The displacement control valve includes a drive force transmitting member, a valve member having a first valve body, a valve chamber, which accommodates the first valve body, an accommodating chamber, which communicates with a control pressure chamber, a pressure sensing mechanism, which adjusts the valve opening degree of the first valve body, a communicating chamber, which is located on the opposite side of the pressure sensing mechanism from the valve chamber, and a second valve body, which is located in the pressure sensing mechanism and selectively opens and closes the communicating chamber. When the current supply to the electromagnetic solenoid is stopped and the pressure in the suction pressure zone in the communicating chamber is higher than a predetermined pressure, the pressure sensing mechanism contracts to open the second valve body. | 02-12-2015 |
20150078922 | HIGH PRESSURE PUMP - A high pressure pump includes a pump body, a pressurizing chamber, a fuel passage, a union, a seat member, a relief valve seat, a relief valve, a discharge valve seat, a discharge valve, a spring and a spring holder. The union has an inner threaded portion and a step portion formed on an inner wall of the union. The seat member includes a relief passage that extends through the seat member in an axial direction of the seat member and a discharge path that is not in fluid communication with the relief passage. The one opening of the relief passage is closer to the pressurizing chamber than an other opening of the relief passage is to the pressurizing chamber. The one opening of the discharge path is further from the pressurizing chamber than an other opening of the discharge path is from the pressurizing chamber. The seat member is pressed toward the step portion when the spring holder is fastened to the union by engaging the inner threaded portion with the outer threaded portion. | 03-19-2015 |
20150118072 | PUMPING SYSTEM - A high pressure pumping system in which a first pump delivers a medium to a discharge port and to a second pump which subsequently delivers the medium to the discharge port. | 04-30-2015 |
20150132152 | Reinforced Smart Mud Pump - A pump system for movement of fluids having a reciprocating piston power pump having at least three reciprocating pistons operable to displace fluid from a housing having a pumping chamber, an integrally forged crankshaft operably connected to the pistons, at least one sensor operable to sense ambient conditions on the pump, and a computer control for processing data from the sensor to regulate the operation of the pump in response to the data. The system also utilizes protective infused treatments for lubricity and enhanced lubrication sprayers and a reset relief valve and pressure sensors operably connected to the computer system for control and monitoring of the pump. | 05-14-2015 |
20150377223 | Hydraulic Swash Block Positioning System - A hydraulic swash block positioning system for positioning a swash block to set a variable displacement, the hydraulic device including a rotor with pistons and piston chambers, the positioning system having, between the housing and the swash block, a positioning cylinder with a positioning piston forming a positioning chamber for setting an average value of the swash block position and a control valve connecting the high oil pressure source with the positioning chamber through a feeding line. In accordance with the invention the feeding line is connected to an oil container that has a variable container volume that can be adjusted synchronously with the changes in the number of piston chambers connected to the high oil pressure source. | 12-31-2015 |
20160069344 | HIGH PRESSURE PAINT PUMP - There is provided an airless paint spray pump wherein the pump is a double acting piston pump having an inlet communicating with a source of paint, a motor for driving the pump, a pressure controller for controlling the pressure of the pressurized paint delivered by the pump, and a filter for filtering the paint delivered by the pump. The pump includes features which increase the accessibility of the components thereof, prevent the incorrect installation of the seal packings in the pump cylinder, and allow the assembly of the piston in the pump cylinder properly aligned with the cylinder so as not to damage the seal packings therein. | 03-10-2016 |