Patents Assigned to Rexroth
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Patent number: 6628186Abstract: A proportional activation magnet (1) for a hydraulic solenoid valve has a pole (3) with a valve cone receiving bore (17) for receiving a valve cone (20) and a pole tube (14) for receiving an armature (30). An armature tappet (33) extends between the armature (30) and valve cone (20). A retention area (35) with a tappet passage opening (36) is provided around the armature tappet (33) in a region between the valve cone receiving bore (17) and pole tube (14). An annular gap with a predefined gap width is formed between the inside of the tappet passage opening (36) and the outside of the armature tappet (33) which extends in the tappet passage opening (36).Type: GrantFiled: August 3, 2001Date of Patent: September 30, 2003Assignee: Bosch Rexroth AGInventor: Hans Wölfges
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Patent number: 6611138Abstract: An inductive length measuring system which, by scanning a scale with a graduation of periodically variable reluctance and a coil system in a linear arrangement, can detect information relating to the position and/or the movement of the coil system with reference to the scale. The coil structure comprises a multi-ply arrangement of a combination of coils in the form of planar spiral windings or turns having a plurality of receiver pairs, each pair having two differentially connected receiver elements which can be interconnected for the purpose of signal generation for each of at least two measuring channels, and wherein at least one emitter element is provided which is inductively coupled to the receiver elements as a function of the relative position in the measuring direction relative to the measuring scale, thereby generating at least one output signal which is compensated for offset and/or sinusoidal shape and/or amplitude.Type: GrantFiled: June 18, 2001Date of Patent: August 26, 2003Assignees: Rexroth Star GmbH, AMO Automatisierung Messtechnik Optik GmbHInventor: Victor Vasiloiu
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Patent number: 6601611Abstract: A hand-actuated control device with an actuating element which extends largely parallel to the axial plane and is fastened to the control lever, the two control signal generators can be actuated individually or jointly in order to generate a control signal. Between two first control signal generators is arranged a further control signal generator. A control lever can be turned together with an actuating element about the lever axis from a first turning position, in which the first control signal generators can be actuated by the actuating element, into a second turning position and vice versa. The actuating element is provided with a recess in such a way that the further control signal generator can be actuated only in the second turning position.Type: GrantFiled: March 28, 2001Date of Patent: August 5, 2003Assignee: Bosch Rexroth AGInventor: John Chapman
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Patent number: 6598622Abstract: A directional control valve which has a movable control piston (5) which separates two pressure chambers (6, 8) from each other in the valve housing interior, which pressure chambers can be subjected to control pressure in order to move the control piston (5) into axial positions corresponding to relevant switch positions of the valve in accordance with the difference in pressure prevailing between the control chambers (6, 8). An arrangement (29) acts on the control piston (5), produces an actuating force and prestresses the control piston for movement into an axial position corresponding to a desired predetermined position.Type: GrantFiled: June 4, 2001Date of Patent: July 29, 2003Assignee: Bosch Rexroth AGInventors: Werner Reith, Binh Nguyen Xuan
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Patent number: 6595327Abstract: A linear motion unit (10) includes a runner that is arranged so as to be movable back and forth on a rod along the rod's axis (S), and at least one lubricating device (28) surrounding the rod at least partially. The lubricating device (28) includes at least one lubricating element (32) that stands in lubricating contact with the rod, and at least one lubricant reservoir (34) that is carried by the runner. In accordance with the invention, the lubricant reservoir (34) is arranged radially outside the lubricating element (32) with respect to the axis (S) of the rod.Type: GrantFiled: May 29, 2001Date of Patent: July 22, 2003Assignee: Rexroth Star GmbHInventor: Bernhard Keller
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Publication number: 20030131826Abstract: A HEUI system uses a fixed displacement, piston pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the pump to minimize parasitic power drains on the engine. The piston pump includes an orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.Type: ApplicationFiled: December 2, 2002Publication date: July 17, 2003Applicant: Bosch Rexroth CorporationInventors: Brian William Smith, Eric D. Ramseyer, Mark Douglas Correll
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Patent number: 6589029Abstract: A compact hydraulic supply unit has a housing forming a reservoir for a pressure fluid, and includes a housing bottom, a housing cover and a housing middle part therebetween in the form of a profiled tube. An electric motor has a laminated stator core held by the housing middle part, and drives a pump located at the housing bottom. The housing middle part has axially extending internal holding Webs for holding the laminated stator core. The size of the housing middle part is independent of the size of the electric motor, so that, with a low structural height, the housing can be so formed that it accepts a larger volume of pressure fluid.Type: GrantFiled: November 2, 2001Date of Patent: July 8, 2003Assignee: Bosch Rexroth AGInventor: Roland Heller
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Patent number: 6579070Abstract: A pump assembly which comprises a vane pump and a second hydraulic pump driven together with this vane pump. The vane pump has a suction region in which first pressure spaces between the vanes and second, rear pressure spaces behind the vanes become larger and a pressure region in which the pressure spaces become smaller and in which the pressure spaces are fluidically connected to a pressure outlet. This vane pump is intended particularly for supplying operating cylinders of a hydromechanical transmission of a motor vehicle with pressure fluid under relatively high pressure. The second hydraulic pump has positively driven displacement elements and is intended for supplying a circuit having a relatively low system pressure, in particular a lubricating-oil circuit of the motor vehicle, with pressure fluid.Type: GrantFiled: June 21, 2001Date of Patent: June 17, 2003Assignee: Bosch Rexroth AGInventors: Egon Birkenmaier, Günter Fischer
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Patent number: 6575630Abstract: A rolling element chain (10) comprises a plurality of rolling elements (14) arranged in close succession and a longitudinal supporting band (12). The supporting band (12) in turn comprises a plurality of recesses (16) for the accommodation of the rolling elements (14), a plurality of retaining elements (20) for retaining the rolling elements accommodated in the recesses (16), where each rolling element (14) is assigned at least one retaining element (20), and at least one longitudinal flexible element (18) for interconnection of the retaining elements (20). Each rolling element (14) is retained, by the at least one retaining element (20) assigned to it, in the longitudinal direction (L) of the supporting band (12) either at its leading side only or at its following side only.Type: GrantFiled: January 30, 2002Date of Patent: June 10, 2003Assignee: Rexroth Star GmbHInventors: Günter Blaurock, Rudolf Schlereth, Hans-Georg Stender
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Patent number: 6571553Abstract: A hydraulic control arrangement for operating a winch with an adjustable hydraulic motor in the easing, hoisting and mooring modes. The arrangement comprises a pilot controller with a control lever which can be actuated as desired and can be deflected from a neutral position in opposite directions over a specific easing angle range and over a specific hoisting angle range. Previously, for the mooring mode, the control lever was blocked at a desired point in the hoisting angle range. The control lever, as viewed from the neutral position, can be deflected over a mooring angle range on the other side of the hoisting angle range, with increasing deflection of the control lever in the mooring angle range, the hydraulic motor being adjusted in the direction of a greater absorption volume and therefore in the direction of a greater torque and increased tension on the hawser.Type: GrantFiled: September 19, 2001Date of Patent: June 3, 2003Assignee: Bosch Rexroth AGInventors: Heinz Habermann, Wilhelm Kastel
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Patent number: 6567255Abstract: An electromagnetic actuator with a control circuit, a combinational circuit and a power section as well as with a magnetic coil, which is connected via electrical lines to the output of the power section, the output signal of the control circuit is passed on to the power section only when, in addition to the output signal of the control circuit, the combinational circuit is fed a release signal. For safety reasons, current is to flow via the magnetic coil only when the release signal is simultaneously available. For monitoring the effectiveness of the combination of the output signal of the control circuit connected upstream of the power section with the release signal with respect to the current flow via the magnetic coil, the voltage of that line which is supplied with the operating voltage on activation of the power section is fed to an evaluation circuit. The evaluation circuit has a threshold switch, which converts the voltage fed to it into a switching signal.Type: GrantFiled: December 17, 1999Date of Patent: May 20, 2003Assignee: Bosch Rexroth AGInventors: Karlheinz Panzer, Rudolf Stenger, Reiner Vathjunker
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Patent number: 6564468Abstract: In an arrangement for determining the relative position of two bodies (3, 7) that are movable relative to each other, a separate measuring tape (29) is attached to a first (3) of the two bodies (3, 7). The measuring tape includes at least one track of measuring markings, distributed in the longitudinal direction of the tape. The second (7) of the two bodies (3, 7) carries a sensor arrangement (31) which responds to the measuring markings and travels along the track, in the course of relative movement between the two bodies (3, 7). The measuring tape (29) is attached to the first body (3), at at least two attachment points that are arranged at a distance from each other in the longitudinal direction of the tape, and is elastically stretched between the attachment points in the longitudinal direction of the tape.Type: GrantFiled: May 15, 2002Date of Patent: May 20, 2003Assignee: Rexroth Star GmbHInventors: Peter Blattner, Bruno Schnös, Herbert Kirchner
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Patent number: 6561053Abstract: A rolling-body screw drive (10) comprises a threaded spindle and a threaded nut (12) enclosing the threaded spindle. A helically running threaded channel (16) is provided between an outer circumferential surface of the threaded spindle and an inner circumferential surface (12a) of the threaded nut (12). The threaded channel (16) forms, together with a return channel (22) in the nut (12) which connects the two end regions (16a, 16b) of the threaded channel (16), an endless circulatory channel (24) in which an endless series of rolling bodies is accommodated. Each of the two end regions (16a, 16b) of the threaded channel (16) is assigned a deflecting element (18) which is retained on the threaded nut (12) and has a deflecting channel (20) for transferring the rolling bodies between the threaded channel (16) and the return channel (22). At least one of the deflecting elements (18) is made up of at least two deflecting-element parts (26, 28) which together bound the deflecting channel (20).Type: GrantFiled: March 7, 2001Date of Patent: May 13, 2003Assignee: Rexroth Satr GmbHInventor: Roland Greubel
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Patent number: 6557344Abstract: The invention relates to a hydraulic drive with a plurality of hydraulic consumers also comprising a differential cylinder which are located in particular on a plastics injection-molding machine. There are a first hydraulic machine and a second hydraulic machine, which can both operate as pump and as motor. A first of the two hydraulic machines is connected to a tank by means of a second port and rests against a pressure line by means of a first port, which pressure line can be connected to that working chamber of the differential cylinder which is remote from the piston rod via a shut-off valve. The second hydraulic machine is likewise connected to the pressure line by means of a first port and can be connected, by means of a second port, to a tank via a nonreturn valve which opens toward the second port and to the piston-rod-side working chamber of the differential cylinder via a shut-off valve.Type: GrantFiled: November 13, 2001Date of Patent: May 6, 2003Assignee: Bosch Rexroth AGInventor: Reiner Püschel
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Patent number: 6532989Abstract: A hydraulic distributor that has a regulating balance including a housing hollowed in the distributor body and containing coaxially a fixed central core. A tubular plunger is interposed sliding freely, coaxially, between the core and the housing and co-operates with a lateral orifice connected to a working orifice. The core and the plunger define between them an annular chamber. The plunger has a first radial annular surface subjected to the highest charge pressure (LS) and a second annular surface subjected to the pressure of the intake fluid. A central passage in the core constitutes a first orifice emerging at one end of the housing exposed to the highest charge pressure (LS). A second orifice emerges in the annular chamber and a third orifice is located opposite the other end of the housing and remains closed by the plunger as long as the charge pressure of the distributor is below the highest charge pressure (LS).Type: GrantFiled: September 7, 2001Date of Patent: March 18, 2003Assignee: Mannesmann Rexroth S.A.Inventor: Wolfgang Kauss
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Patent number: 6527540Abstract: A hydrostatic drive system for an injection molding machine which has a movable mold-closing plate comprises a hydraulic pump and a differential hydraulic cylinder, by which the mold-closing plate can be moved in the direction of the closing position by the feeding of pressure medium into the second pressure space remote from the piston rod and can be moved in the direction of the open position by the feeding of pressure medium into the first pressure space on the piston-rod side.Type: GrantFiled: January 29, 2001Date of Patent: March 4, 2003Assignee: Bosch Rexroth AGInventor: Jörg Dantlgraber
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Patent number: 6516614Abstract: A method and a control arrangement for driving at least one hydraulic consumer are disclosed. The control arrangement comprises a pump whose output is adjustable as a function of the load pressure of a consumer. The consumer is driven through a proportional directional valve forming a measuring orifice, a pressure compensator being associated with the directional valve, allowing the pressure drop across the measuring orifice to be maintained constant irrespective of the load pressure. According to the invention, a low load pressure is indicated to the pump when the pressure compensator is completely open, so that the pressure drop across the measuring orifice is reduced.Type: GrantFiled: June 8, 2001Date of Patent: February 11, 2003Assignee: Bosch Rexroth AGInventor: Burkhard Knoll
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Patent number: 6513976Abstract: In a linear guide arrangement (10a) with an elongated guide rail (12a) and a guide carriage (14a) that can travel thereon in the lengthwise direction (L) of the guide rail (12a), a surface of the guide rail (12a) facing the guide carriage (14a) is covered by a cover band (24a). A band securing element (32a) is placed in the vicinity of each of the two longitudinal ends (30a) of the guide rail (12a). The two band securing elements (32a) jointly secure the cover band (24a) at least with respect to its displacement in lengthwise direction (L) of the guide rail (12a), wherein each of the band securing elements (32a) at least impedes movement of the cover band (24a) relative to the guide rail (12a) directed towards the other band securing element (32a). At least one of the band securing elements (32a) can be non-positively engaged with the cover band (24a) as well as with the guide rail (12a).Type: GrantFiled: October 4, 2001Date of Patent: February 4, 2003Assignee: Rexroth Star GmbHInventors: Harald Maiss, Richard Weidner, Günter Blaurock, Herbert Kirchner, Holger Schmitt, German Dütsch, Alfred Haub
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Patent number: 6499296Abstract: A hydraulic circuit for controlling a consumer of a mobile work tool, wherein the pressure in supply and outlet lines towards the consumer is limited by means of pilot-controlled pressure control valves. The pilot control stage of these pressure control valves may be adjusted in accordance with a pilot control pressure corresponding to the load of the work tool.Type: GrantFiled: February 15, 2001Date of Patent: December 31, 2002Assignee: Mannesmann Rexroth AGInventors: Thomas Weickert, Erich Adlon
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Patent number: 6499295Abstract: The present invention relates to a hydro-transformer including a hydraulic machine, a switching valve and a control means. A work port of the switching valve, which may optionally be connected hydraulically with a pressure port of the switching valve or a drain port of the switching valve, is connected with a first port of the hydraulic machine. The second port of the hydraulic machine is in hydraulic connection with a drive member. The switching valve is driven by the control means in response to a signal characterizing the volume flow into the hydraulic machine. Where the driver member is a cylinder, its extension may be carried out at a constant velocity and independently of a load, and energy may be recovered upon retraction. Due to the provision of a further switching valve between the second part of the hydrostatic motor and the drive member, a higher pressure may be generated at the drive member in the presence of a low pressure at the pressure port of the switching valve.Type: GrantFiled: April 9, 2001Date of Patent: December 31, 2002Assignee: Mannesmann Rexroth AGInventor: Jorg Dantlgraber