Patents
Sitemap › F15 - Fluid-pressure actuators; Hydraulics or pneumatics in general › F15B - Systems acting by means of fluids in general; Fluid-pressure actuators, e.g. servomotors; Details of fluid-pressure systems, not otherwise provided for › F15B 11 - Servomotor systems without provision for follow-up action
Patents for F15B 11 - Servomotor systems without provision for follow-up action (16,384)
03/1991
03/20/1991CN1012053B Hydraulic device with adjustable pump
03/19/1991US5000001 Dual load-sensing passage adjustable relief valves for hydraulic motor control
03/19/1991CA1281612C Brake circuit apparatus for hydraulic motor
03/14/1991DE3930553A1 Lifting mechanism hydraulic control system - has pressure-equalisers for flow to and from pressure accumulator
03/13/1991EP0416130A1 Hydraulic valve capable of pressure compensation
03/13/1991CN2073048U Automatic reciprocatable liquid-controlled cylinder system
03/12/1991CA1281259C Load sensing circuit of load responsive direction control valve
03/07/1991WO1991002905A1 Hydraulic driving apparatus of civil engineering/construction equipment
03/07/1991WO1991002904A1 Pressure oil feed circuit device for hydraulic cylinder of operation machine
03/07/1991WO1991002902A1 Valve device and hydraulic circuit device
03/06/1991EP0415133A1 Hydraulic circuits for actuators
03/05/1991US4997159 Logic valve
03/05/1991US4996907 Pneumatic knocking device
03/01/1991CA2021922A1 Powers transmission
02/1991
02/26/1991US4995470 Control apparatus for hydraulic continuously variable speed transmission
02/26/1991CA1280785C Method and system employing strings of opposed air- inflatable tension actuators in jointed arms, legs, beams and columns for controlling theirmovements
02/21/1991WO1991002167A1 Device for controlling hydraulic pump
02/19/1991US4993924 Reciprocating pump
02/19/1991US4993226 Multi-piston air-oil pressure intensifier with automatically variable working stroke length
02/19/1991CA1280338C Independently actuated pressure relief system
02/13/1991CN2071271U Back pressure self-adjusting composite valve and hydraulic drive system
02/13/1991CN1049218A Hydralic drive automobile
02/07/1991WO1991001451A1 Pressure-relief valve
02/07/1991DE4023946A1 Piston seals for pneumatic cylinder - with combination of slide rings and displaceable seals
02/06/1991EP0411808A1 Logic valve
02/06/1991EP0411151A1 Hydraulic circuit for working machines
02/06/1991EP0346352B1 Hydraulic device with regulable pump
02/06/1991CN1011528B 液压系统 Hydraulic system
02/05/1991US4989495 Hydraulic positioning system with normal and high supply and exhaust flow paths
01/1991
01/31/1991DE3924437A1 Druckbegrenzungsventil Pressure relief valve
01/30/1991EP0410053A1 Method of controlling the slewing operation of a slewing mechanism and a hydraulic control system for carrying out the same
01/30/1991CN1048912A Fluid speed changing device
01/29/1991CA1279689C2 Solenoid assembly for an automatic transmission controller
01/29/1991CA1279554C Auxiliary coupler pressure relief hydraulic system
01/29/1991CA1279553C Alternating valve
01/22/1991US4986072 Hydraulic actuator circuit with flow-joining control
01/22/1991US4986071 Fast response load sense control system
01/22/1991CA1279231C Load responsive system having synchronizing systems between positive and negative load compensation
01/17/1991DE3922517A1 Hydraulic controller for actuator on agricultural machine - has control valve coupling load, circulation and reservoir in selective interconnection
01/16/1991EP0335939B1 Hydraulic drive system
01/15/1991CA1278978C Hydraulic system for an industrial machine
01/10/1991WO1991000432A1 Hydraulic circuit
01/10/1991WO1991000431A1 Hydraulic circuit for operating cylinder of working machine
01/09/1991EP0407231A1 Hydraulic pump control circuit for travelling construction machines
01/02/1991EP0404946A1 Hydraulic circuit device of construction vehicle
01/02/1991CA1278494C Load responsive control system adapted to use of negative load pressure in operation of system controls
01/01/1991US4981159 Controlling flow of oil
12/1990
12/27/1990WO1990015931A1 A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor
12/27/1990CA1278360C Load sensing circuit of load compensated direction control valve
12/26/1990CN1010969B Controlling system for load-transducing hydraulic circuit
12/19/1990EP0402474A1 Service valve circuit in a hydraulic excavator
12/19/1990CN1010875B Valve manifold stacking base
12/18/1990US4977928 Load sensing hydraulic system
12/12/1990CN1047724A Power transmission
12/11/1990US4976187 Fast sweep power cylinder for refuse trucks
12/11/1990US4976106 Load-sensing variable displacement pump controller with adjustable pressure-compensated flow control valve in feedback path
12/05/1990CA2012784A1 Fast response load sense control system
12/04/1990CA1277191C Pneumatic interface apparatus
11/1990
11/29/1990WO1990014519A1 Hydraulic circuit apparatus
11/28/1990EP0399102A1 Hydraulic-pneumatic cylinder device
11/28/1990CN2066527U Hydraulic oil pumping throttling speed adjusting loop with nonadjustable damper
11/28/1990CN1047261A Oil hydraulic lift
11/28/1990CN1010607B Direction controlling valve with hydraulic pilot valve
11/27/1990CA1277013C Electrically operated automatic transmission controller assembly
11/27/1990CA1276858C Load compensated valve
11/22/1990DE3915919A1 Control block to position platform on goods vehicle - gives combination of rapid movement and braking functions
11/21/1990CN1010490B Hydraulic circuit for hydraulic engineering machine
11/14/1990EP0397389A1 Air Cylinder
11/14/1990EP0396760A1 Operation valve device
11/13/1990US4969487 Solenoid valve
11/06/1990US4968099 Fluid control system for roadway grooving apparatus
11/06/1990US4967557 Control system for load-sensing hydraulic drive circuit
11/06/1990US4967554 Commonly-piloted directional control valve and load pressure signal line relieving switching valve
11/01/1990WO1990012973A1 Counterbalance valve
10/1990
10/31/1990EP0395420A2 Electro-hydraulic actuator
10/31/1990EP0394465A1 Hydraulic driving apparatus
10/30/1990CA1275715C Proportional valve control apparatus for fluid systems
10/24/1990EP0393697A2 Electrohydraulic system
10/24/1990EP0393195A1 Fluid control mechanism for power shovels
10/23/1990US4964434 Dual control valve suitable for high pressure fluids
10/18/1990WO1990012212A1 Hydraulic circuit of closed center load sensing system
10/11/1990DE3911022A1 Control circuit for a hydraulic power lift operated with a variable-displacement pump
10/11/1990DE3910895A1 Control arrangement independent of load for hydraulic consumers
10/10/1990EP0391868A2 Arrangement for positioning accuratelly the pistons of load-carrying pressure-fluid cylinder devices
10/10/1990EP0391307A1 Hydraulic control circuit arrangement for a single-acting cylinder
10/09/1990US4961371 Hydraulic circuit for a backhoe
10/09/1990US4961317 Oleopneumatic intensifier cylinder
10/09/1990US4961316 Controlled electric pump drive for hydraulic lifting arrangement with gas spring in motor
10/09/1990CA1275023A1 Control device for at least one hydraulically operated load
10/04/1990WO1990011453A1 Hydraulic valve capable of pressure compensation
10/02/1990US4960035 Control system for a hydraulic lift driven by a variable displacement pump
10/02/1990US4959957 Hydraulic actuating unit, in particular for raising a load, such as a hospital bed
10/02/1990CA1274748A1 Balanced hydraulic propulsion system
09/1990
09/26/1990CN1045551A 液压冲击工具 Hydraulic impact tools
09/25/1990US4958548 Hydraulic drive mechanism
09/25/1990US4958495 Hydraulic differential cylinder
09/25/1990CA1274605A1 Control circuit for positioning an earthmoving blade
09/20/1990WO1990010795A1 Hydraulic driving unit for working machine
09/19/1990EP0171392B1 Load responsive system
09/18/1990US4957457 Control system for the hydraulic tilt function of a marine engine
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