17results about "Telemotors" patented technology

A system and method for a hydraulic swing system of a machine to prevent drift without engaging a swing brake is described. The hydraulic swing system includes a pump powered by a motive element such as an engine and provides a swing motor for rotating the chassis of the machine relative to the undercarriage. The swing system includes a control valve on a first path between the pump and the motor and a second control valve on a second path. The swing system further includes a blocking valve to blocking hydraulic fluid flow and thereby preventing drift engaged when the system is in neutral and below a threshold rotation rate.

An accumulator assembly is interposed hydraulically between a source of pressurized fluid and at least one wheel brake of a corresponding first or second pair of wheels. The accumulator assembly includes a medium pressure accumulator, a nonpowered MPA fill valve interposed fluidically between a pump-side passage of the medium pressure accumulator and the source of pressurized hydraulic fluid, a powered MPA one-way valve interposed fluidically between a brake-side passage of the medium pressure accumulator and the at least one corresponding wheel brake, and an MPA check valve interposed fluidically between the brake-side passage of the MPA cavity and the at least one corresponding wheel brake. An electronic control unit is provided for controlling at least one of the secondary brake module and the master cylinder responsive to at least one braking signal. The accumulator assembly facilitates a non-powered evac / fill phase of lifetime operation of the brake system.

A hydraulic drive includes a hydraulic circuit having a hydraulic machine, a hydraulic consumer, a first hydraulic line, and a second hydraulic line. The hydraulic drive further includes an inertia charging arrangement having a hydraulic motor configured, in response to a power failure of the hydraulic drive, to receive hydraulic fluid from a high-pressure line of the first and second hydraulic lines and to expel hydraulic fluid to a low-pressure line of the first and second hydraulic lines, and a hydraulic pump operably connected to the hydraulic motor such that the hydraulic motor drives the hydraulic pump. The hydraulic pump is configured to pump hydraulic fluid from a reservoir into the low-pressure line.

A hydraulic system includes a hydraulic circuit having a hydraulic machine, a hydraulic consumer, and a first hydraulic line fluidically connecting the hydraulic machine to the hydraulic consumer. The hydraulic system further includes a conditioning circuit having a hydraulic motor configured to withdraw a portion of hydraulic fluid flowing in the first hydraulic line from the hydraulic machine to the hydraulic consumer, the hydraulic motor configured to capture energy from the portion of hydraulic fluid, a conditioning arrangement downstream of the hydraulic motor and configured to condition the portion of hydraulic fluid, and a hydraulic pump arranged downstream of the conditioning arrangement and configured to pump the portion of hydraulic fluid into the first hydraulic line, the hydraulic pump being operably connected to the hydraulic motor and configured to operate at least partially using the energy captured by the hydraulic motor.

The invention relates to a hydraulic actuator (1) having at least one bidirectionally operable hydraulic pump (2) for conveying hydraulic fluid with two connections (6a, 6b), and with a hydraulic actuator component (3) with two hydraulic fluid chambers (4a,4b), to which hydraulic fluid can be applied for actuating the hydraulic actuator component (3), wherein the hydraulic fluid chambers (4a, 4b) are each connected via a line (7a, 7b) to the connections (6a, 6b) of the hydraulic pump (2) such that when one of the hydraulic fluid chambers (4a, 4b) is filled with hydraulic fluid, hydraulic fluid is simultaneously forced out of the other hydraulic fluid chamber (4b, 4a) and a volume of the hydraulic fluid is moved through the hydraulic pump (2), - wherein a second chamber cross section (8b) of the second chamber (4b) differs from a first chamber cross section (8a) of the first chamber (4a) and the first chamber (4a) is connected to a pressure reservoir (5) in which a differential volume (28) can be received and provided, said differential volume occurring as a result of the different chamber cross sections (8a, 8b) of the chambers (4a, 4b), - wherein a first line (7a) connects the first chamber (4a) to the hydraulic pump (2) and a second line (7b) connects the second chamber (4b) to the hydraulic pump (2) and the first line (7a) and the second line (7b) are further connected to one another by a bypass line (9), wherein as a result of the bypass line (9) an undersupply of hydraulic fluid in the hydraulic pump (2) is avoided in that a bypass flow from the first line (7a) into the second line (7b) is adjusted through the bypass line (9) when a pressure in the second line (7b) falls below a threshold value, - wherein in the bypass line (9) a deactivation circuit (11) is arranged by means of which the bypass line (9) can be interrupted when the pressure in the second line (7b) is above a threshold value.

Master cylinder (1) for a clutch actuation device of a motor vehicle, comprising a housing (2) and a piston (3) slidably received in the housing (2), wherein the housing (2) has a flange area (6) extending transversely to a displacement axis (4) of the piston (3) and designed for support on a body-fixed mounting structure (5) of the motor vehicle, characterized in that the flange area (6) is provided on its side (7) provided for support on the mounting structure (5) with a multi-layer sealing and damping element (8) consisting of at least one foamed material, wherein the sealing and damping element (8) has a first layer (9) which consists of a different foamed material or of the same material with a different foam structure than a second layer (10) of the sealing and damping element (8).

Clutch cylinder (1) for a clutch device, with an actuating piston (5) for transmitting an actuating force (F1) to the clutch device, with a cylinder housing (2), wherein the cylinder housing (2) has a pressure chamber (4) for receiving the actuating piston (5), wherein the actuating piston (5) is arranged to be axially displaceable in the pressure chamber (4), with a bellows (7), wherein the bellows (7) is arranged with an end section (7a) on the cylinder housing (2) and with a further end section (7b) on the actuating piston (5), with a gap (8), wherein the gap (8) is formed outside the pressure chamber (4) between the cylinder housing (2) and the bellows (7), wherein the cylinder housing (2) has a ventilation duct (12) for ventilating and / or extracting the space (8), wherein the ventilation duct (12) has several duct sections (12a, b, c, d), wherein the duct sections (12a, b, c, d) connect to each other at an angle, forming a labyrinth, wherein the cylinder housing (2) has a contact section (2a) for contact with a centering surface (14a) and a cylinder section (2b) adjoining the contact section (2a) for forming the pressure chamber (4), wherein the bellows (7) is arranged with the end section (7a) on the contact section (2a), such that the space (8) is limited in a radial direction (RR) by the bellows (7) and in a radial opposite direction (RG) by the cylinder section (2b) and the space (8) is limited in an axial direction (AR) by the contact section (2a), wherein the ventilation channel (12) is introduced into and / or passes through the contact section (2a). characterized by a spring device (9) for pre-tensioning the actuating piston (5), wherein the spring device (9) is arranged in the intermediate space (8) and is supported on one side by a support ring (10) on the cylinder housing (2) and on the other side by a further support ring (11) on the actuating piston (5), wherein the support ring (10) has at least one opening (18) in the area of ​​the ventilation channel (12) so that an inlet interface (ES) is formed, and wherein the mounting section (2a) has a support surface (17) for supporting the spring device (9), wherein at least one channel section (12d) of the ventilation channel (12) is provided in the axial direction (AR) in the support surface (17) as a recess, wherein the at least one channel section (12d) is limited by the support ring (10) in the axial opposite direction (GR).

A method for storing and reutilizing energy during operation of a hydrostatic actuator (EHA) having a hydraulic cylinder, a first bidirectional pump-motor rotationally coupled to an electric motor, and EHA valving and connections between the first pump-motor and the hydraulic cylinder. During at least one of two motoring quadrants, a hydraulic accumulator is charged using a second pump-motor whose rotation is driven by load-driven motoring of the first bidirectional pump-motor. During at least one of the pumping quadrants, driven rotation is imparted to the second pump-motor using stored energy from the accumulator, and said driven rotation of the second pump-motor is used to augment powered rotation of the first bidirectional pump-motor by the electric motor.

An amplifier arrangement is hydraulically connected between a source of pressurized fluid and at least one wheel brake of a corresponding first or second pair of wheels. The accumulator arrangement comprises a medium-pressure accumulator, a non-energized medium-pressure accumulator fill valve fluidically connected between a pump-side passage of the medium-pressure accumulator and the source of pressurized hydraulic fluid, an energized medium-pressure accumulator one-way valve fluidically connected between a brake-side passage of the medium-pressure accumulator and the at least one corresponding wheel brake, and a medium-pressure accumulator check valve fluidically connected between the brake-side passage of the medium-pressure accumulator cavity and the at least one corresponding wheel brake. An electronic control unit is provided for controlling the secondary brake module and / or the master brake cylinder in response to at least one brake signal.The storage arrangement allows for a power-free emptying / filling phase during the operating lifetime of the brake system.

A remote actuation system (100), comprising: A) an actuator assembly (10) comprising: a first cylinder- piston device (11) comprising a first cylinder (12) and a first piston (13) sealingly sliding inside said first cylinder (12) forming a first variable-volume chamber (14) between said first cylinder (12) and said first piston (13) as a function of a relative position between said first cylinder (12) and said first piston (13), a sealing element (15) between said first cylinder (12) and said first piston (13) comprising a first rolling diaphragm (16); an actuator device (30) connected to said first cylinder (12) or said first piston(13) so as to vary said relative position between said first cylinder (12) and said first piston (13); B) an actuated assembly (50) comprising: a second cylinder-piston device (51) comprising a second cylinder (52) and a second piston (53) sealingly sliding inside said second cylinder (52) forming a second variable-volume chamber (54) between said second cylinder (52) and said second piston (53) as a function of a relative position between said second cylinder (52) and said second piston (53), a sealing element (55) between said second cylinder (52) and said second piston (53) comprising a second rolling diaphragm (56); an actuated element (80) connected to said second cylinder (52) or said second piston (53), configured to be actuated as a function of said relative position between said second cylinder (52) and said second piston (53); C) a hydraulic conduit (90), which fluidly connects said first variable-volume chamber (14) to said second 67 variable-volume chamber (54) so that a change in the volume of said first chamber (14) produces a change in the volume of said second chamber (54) having an opposite sign to said change in volume of said first chamber (14); D) an antagonistic preloading device (35, 85) associated with said first cylinder-piston device (11) and / or said second cylinder-piston device (51), configured to apply an antagonistic force (36, 86), which opposes the expansion of said first chamber (14) and / or said second chamber (54), respectively, so as to maintain the internal absolute pressure of said chambers (14, 54) at a value greater than or equal to a predetermined absolute pressure threshold value, during operation; wherein said predetermined absolute pressure threshold value is the greatest of the external absolute pressure value of the environment in which said first cylinder-piston device (11) is immersed and the absolute pressure value of the environment in which said second cylinder-piston device (51) is immersed.

Pressure generator for a hydraulic vehicle brake system, comprising a piston-cylinder unit (2) having a cylinder (4) and a piston (3) which is displaceable in the cylinder (4), and a screw drive (8) comprising a rotatable, axially fixed, threaded component (7) and an axially displaceable, rotationally fixed component (6) having a mating thread, which is axially fixed to the piston (3) of the piston-cylinder unit (2) and whose mating thread engages with the thread of the rotatable component (7) of the screw drive (8), such that a rotary drive of the rotatable component (7) of the screw drive (8) displaces the axially displaceable component (6) of the screw drive (8) and the piston (3) of the piston-cylinder unit (2) which is axially fixed to the axially displaceable component (6) of the screw drive (8), characterized in that the pressure generator (1) has a hollow force transmitter (13) exhibitsin which at least a part of a length of the screw drive (8) is arranged and which transmits an axial force, causing pressure generation with the piston-cylinder unit (2), between the piston (3) of the piston-cylinder unit (2) and the rotatable component (7) of the screw drive (8), and that the pressure generator (1) has a planetary gear (22) to a rotary drive of the rotatable component (7) of the screw drive (8), which is arranged coaxially to the screw drive (8) at one end of the screw drive (8) furthest from the piston-cylinder unit (2), wherein a planet carrier (38) of the planetary gear (22) is rotationally fixed to the rotatable component (7) of the screw drive (8) by a positive locking connection (40) which can be placed axially onto the rotatable component (7) of the screw drive (8), and wherein a ring gear (21) of the planetary gear (22) is connected by a positive locking connection (42) which can be placed axially in the power transmitter (13) can be used,is connected to the power transmitter (13) in a rotationally fixed manner.

To provide an artificial muscle and a method for actuating the artificial muscle.SOLUTION: An artificial muscle includes: a housing having an electrode region and an expandable fluid region; a dielectric fluid accommodated in the housing; an electrode pair arranged in the electrode region of the housing, and including a first electrode and a second electrode; and an electrode insulator having one or a plurality of insulation layers. The electrode insulator is arranged on an inside electrode face of the first electrode of the electrode pair. The second electrode includes the inside electrode face which is exposed and released to the dielectric fluid when the electrode pair is in a non-actuated state. The electrode pair can be actuated between the non-actuated state and an actuated state, and an actuation from the non-actuated state to the actuated state introduces the dielectric fluid into the expandable fluid region, expanding the expandable fluid region.SELECTED DRAWING: Figure 3

An example hydraulic system has: a hydraulic cylinder actuator having a cylinder and a piston axially movable in the cylinder, wherein the piston has a piston head that divides an internal space of the cylinder into a first chamber and a second chamber; a fluid reservoir; a pilot pressure source that generates a pilot fluid signal; and a valve assembly controlling fluid flow to and from the hydraulic cylinder actuator, wherein the valve assembly has a first workport fluidly coupled to the first chamber, a second workport fluidly coupled to the second chamber, a reservoir port fluidly coupled to the fluid reservoir, and a pilot port fluidly coupled to the pilot pressure source to receive the pilot fluid signal, wherein the pilot fluid signal actuates the valve assembly to fluidly couple the first workport and the second workport to the reservoir port, thereby operating the piston in a float mode.

A brake system for actuating a plurality of wheel brakes in a normal non-failure braking mode and in a backup braking mode includes an MC-type power transmission unit having a first electric motor. An iso / dump control valve arrangement is associated with each wheel brake of the plurality of wheel brakes. A pump piston is associated with at least one wheel brake of the plurality of wheel brakes. The pump piston is driven by a second electric motor for selectively providing pressurized hydraulic fluid to the iso / dump control valve arrangement. At least one electric brake motor is operative to selectively drive a selected wheel brake. A first electronic control unit is operative to selectively control the first electric motor. A second electronic control unit is operative to selectively control the second electric motor. A third electronic control unit is operative to control the at least one electric brake motor.

A linear actuator system includes a linear actuator and an integrated pump assembly connected to the linear actuator to provide fluid to operate the linear actuator. The integrated pump assembly includes a pump with two fluid drivers, each fluid driver comprising a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from a first port of the pump to a second port of the pump. The pump assembly also includes two valve assembles to isolate the pump from the system. The linear actuator system also includes a controller that establishes the pump in a normal mode of operation in which the prime movers are independently driven and switches to a fail-safe mode of operation in which only one prime mover is operated.

Agricultural or work vehicle comprising an internal combustion engine (E), an electro-hydraulic circuit (HC) for powering at least one hydraulic actuator (Al - A3) by means of a respective closed-center control valve (V1 - V3), comprising a first hydraulic pump (P) operatively connected to the internal combustion engine (E) to be driven in rotation by it to power said valves (V1 - V3) by means of a hydraulic supply line (PP), a transmission having a hydrostat (HY) comprising a second hydraulic pump (HP) operatively connected to the internal combustion engine (E) to be driven in rotation by it and a pair of hydraulic lines (F, R), wherein the first hydraulic pump has a variable displacement with a displacement value that is a function of a sensing signal generated by a sensing line (LS) connected downstream of said control valve (V1 - V3) and by a supply pressure signal generated by the supply line (PP). A compensation valve (A) is arranged to connect said pair of hydraulic lines (F, R) with said supply line (PP), wherein the compensation valve is controlled as a function of the sensing signal and the supply signal.