331results about "Telemotors" patented technology

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 work machine includes: a hydraulic actuator; a closed-circuit pump that is connected to the hydraulic actuator in a closed circuit, and supplies and discharges a hydraulic working fluid to and from the hydraulic actuator; an open-circuit pump that is connected to the hydraulic actuator in an open circuit, and supplies the hydraulic working fluid to the hydraulic actuator; a charge pump; a charge flow path that introduces the hydraulic working fluid delivered from the charge pump to the closed circuit; an excess fluid discharging device that discharges an excess hydraulic working fluid of the closed circuit to the charge flow path; and a controller that controls a delivery capacity of the closed-circuit pump and a delivery capacity of the open-circuit pump. The controller increases the delivery capacity of the open-circuit pump, or reduces the delivery capacity of the closed-circuit pump when a state of a pressure of the charge flow path has transited to be lower than a predetermined pressure threshold from equal to or higher than the predetermined pressure threshold, or when a state of the work device has transited to a state of performing the excavation work from a state of not-performing the excavation work.

A method for filling a hydraulic circuit of an electro-hydrostatic system includes connecting first and third shut-off valves to a discharge valve, and connecting a second shut-off valve to a filling valve, while the second and third shut-off valves are closed, opening the filling valve, the discharge valve and the first shut-off valve and operating a vacuum generator, once a vacuum has been established in the hydraulic circuit, opening the second shut-off valve in order to fill the hydraulic circuit with pressurized hydraulic fluid while the vacuum generator is still in operation, once the hydraulic circuit has been filled with fluid, closing the first shut-off valve and then opening the third shut-off valve in order to bypass the vacuum generator and circulate the fluid through the electro-hydrostatic system until the fluid contained in the hydraulic circuit reaches a predetermined pressure, and closing the discharge valve and the filling valve.

The invention relates to a hydraulic transmission unit for an actuator, which hydraulic transmission unit can be filled with a hydraulic fluid and has a first and a second chamber which are hydraulically interconnected and of which one is designed as a drive chamber and the other one is designed as an output chamber. At least in the first chamber, a piston is arranged movably along a piston axis, such that this piston subdivides the first chamber into a variable-volume working chamber and a rear-side chamber, the rear-side chamber being delimited at least partially by a bellows element having a variable axial length. The invention further relates to an actuator having such a hydraulic transmission unit.

The invention relates to a low-pressure unit (1) for raising a pressure level in a hydraulic drive (8). The low-pressure unit (1) comprises a tank pressure accumulator (2) for storing a hydraulic fluid at a desired pressure, a low-pressure accumulator (3) downstream of the tank pressure accumulator (2) for intermediate storage of the fluid, and a hydraulic pump (4) driven by a motor (5). According to the invention, the tank pressure accumulator (2), the low-pressure accumulator (3), and the pump (4) are hydraulically coupled to one another via a connecting block (6), and the connecting block (6) is designed such that the low-pressure unit (1) can be directly integrated into or connected to a main control block of the hydraulic drive (8) via the connecting block (6), or is already integrated into or connected to it.

An actuator system for articulated mechanism may have a fluid actuator having a displaceable member operating an output configured to apply an output force to the articulated mechanism. A fluid system may be in fluid communication with the fluid actuator to supply the fluid actuator with motive fluid to contribute to the output force. The fluid system may include a pressure reservoir configured for storing fluid, a pumping device for controlling a pressure of the fluid in the reservoir, and a circuit for directing the fluid from the reservoir to the fluid actuator. An actuator device may be operatively connected to the fluid actuator to apply a variable force to the displaceable member to contribute to the output force.

The invention proposes a double barrier pressure compensator for performing a pressure compensation between seawater surrounding a subsea installation and a medium filling a volume of the subsea installation. Said pressure compensator comprises: —a housing (20) having a first opening (202b) and a second opening (30); —a first bellows (4) and a second bellows (5) arranged one above the other within the housing (20) and each sealingly fixed to the housing (20) at their distal ends (43, 53); —a moving separation element (6) adapted to move inside the housing (20) and sealingly fixed to each of the proximal ends (44, 54) of the first and second bellows (4, 5) so as to separate a first compartment (21) from a second compartment (22) of the housing (20) sealed with respect to each other. Said pressure compensator (2) further comprising a third compartment (23) formed by a space between the housing (20) and the first and second bellows (4, 5), the first compartment (21) being arranged to be fluidly connected to the subsea installation (1) through the second opening (30), the second compartment (22) being arranged to be in communication with sea water through the first opening (202b), and said third compartment (23) being filled with a barrier medium.

An open and closed circuit parallel drive system and a control method based on a four-chamber hydraulic cylinder are provided. The system includes: a closed pump-controlled drive unit and an open valve-controlled drive unit. The four-chamber hydraulic cylinder is driven by the open valve-controlled drive unit with a large load power, and the operating velocity and displacement of the four-chamber hydraulic cylinder are controlled by the closed pump-controlled drive unit with a small load power, thereby improving the linearity and stability of the four-chamber hydraulic cylinder control and reducing the system installed power and throttling loss.

The present invention obtains a hydraulic pressure control unit capable of appropriately detecting abnormality in a hydraulic pressure control unit.In a hydraulic pressure control unit (5) according to the present invention, a controller (52) includes a diagnosis section that executes a diagnostic mode to diagnose presence or absence of abnormality in the hydraulic pressure control mechanism (51) on the basis of a current fluctuation of a motor (35) in a state where a pump (34) is driven by the motor (35).

The present disclosure belongs to the technical field of hydraulic control, and relates to a velocity and position compound control system for a pump-valve dual-source driven hydraulic cylinder used in engineering machinery. The system includes a first power source, a first hydraulic pump, a second power source, a second hydraulic pump, a safety valve, a proportional directional valve, a pilot operated check valve, a single-rod hydraulic cylinder, a handle, a tank, a rotating speed sensor, a first pressure sensor, a second pressure sensor, a third pressure sensor, a temperature sensor, a position transmitting unit, magnetic induction marks, a count correction module, an integrator module, a calculation control module, a signal acquisition module, a data storage module, a cloud memory, a communication protocol module, a fault diagnosis module, and a process monitoring module.

A thrust reverser device for an aircraft turbojet engine nacelle an electro-hydrostatic actuation system that includes a motor pump and a first actuation assembly. The first actuation assembly includes a series of at least two actuators configured to be attached to a movable cover of the thrust reverser and to move the movable cover or covers between a retracted position and a deployed position relative to the nacelle. The first electro-hydraulic actuation system further includes a volumetric flow divider with an inlet connected to the motor pump and at least two outlets, wherein each outlet is connected to an actuator. The volumetric flow divider is configured to receive a fluid and to supply the fluid to the actuators with an equal flow rate.

The present invention provides a hydraulic pressure control unit capable of appropriately detecting abnormalities in the hydraulic pressure control unit. In a hydraulic pressure control unit (5) according to the present invention, a control device (52) that includes a diagnosis unit that runs a diagnosis mode for diagnosing the presence / absence of an abnormality in a hydraulic pressure control mechanism (51) on the basis of current fluctuations in a motor (35) under conditions in which a pump (34) is driven by the motor (35).

A hydraulic system (1A) according to one embodiment is provided with: a first two-way pump (2) connected to a single-rod cylinder (4) via a head-side line (21) and a rod-side line (22); a second two-way pump (3) connected to the head-side line (21) via a first supply / discharge line (31); and the energy accumulator (7) is connected with the second two-way pump (3) through a second feeding and discharging pipeline (71). The hydraulic system (1A) is further provided with a low-pressure selection valve (6) connected to the head-side line (21), the rod-side line (22), and the second supply / discharge line (71). The second supply / discharge line (71) is connected by a relay line (72) to a portion between a pair of check valves (55, 56) in a bridge line (54) connecting the head-side line (21) and the rod-side line (22).

Device (1) for use in a braking system for a motor vehicle, wherein the device (1) has a housing (2) designed as a tandem master cylinder and wherein a piston (3) is designed as the piston of the tandem master cylinder, comprising a housing (2) with a housing outer surface (22) and a housing inner space (21), a piston (3) which can be inserted through an opening into the housing (2) and is linearly movable in the housing inner space (21), and a sensor arrangement (8) designed to detect a position of the piston (3), characterized in that the housing (2) has a slot (7) extending between the housing inner space (21) and the housing outer surface (22), in which at least a part of the sensor arrangement (8) is arranged.

Actuator (1, 1a, 1b), in particular hydrostatic actuator, for a motor vehicle with a rotor (3) and a stator (4) with at least one winding (8) and a circuit board (6, 6a, 6b) controlling the current supply to the at least one winding (8) and at least one connection (9) of the at least one winding (8) to the circuit board (6, 6a, 6b), wherein at least one compensating element (11, 11a) is connected to the circuit board (6, 6a, 6b) with a cantilever (12) following the path of the at least one connection (9) passing through the circuit board (6, 6a, 6b), and the at least one connection (9) and the cantilever (12) are electrically connected to each other on the side of the circuit board (6, 6a, 6b) facing away from the at least one winding (8), the at least one compensating element (11, 11a) by means of three uniformly spaced Mounting pins (13, 13a) are attached to the circuit board (6, 6a, 6b), and between a,The central part (15) receiving the boom (12) and the fastening pins (13, 13a) each has a curved arm (17, 17a), characterized in that the respective arm (17, 17a) is curved in a plane parallel to the circuit board (6, 6a, 6b).

Disclosed herein is an electric brake system including a reservoir, a master cylinder, a hydraulic pressure supply device configured to operate a hydraulic piston according to an electrical signal output in response to a displacement of a brake pedal and generate a hydraulic pressure, a hydraulic pressure control unit configured to control the hydraulic pressure transmitted to a wheel cylinder from the hydraulic pressure supply device, a hydraulic pressure auxiliary device configured to operate when the hydraulic pressure supply device is inoperable and provide the hydraulic pressure to two wheel cylinders and including a pair of pumps configured to pressurize the pressurizing medium, a motor configured to drive the pair of pumps, a first support valve provided on a first auxiliary hydraulic pressure flow path for transmitting the pressurizing medium pressurized by any one of the pair of pumps to a first wheel cylinder to control a flow of the pressurizing medium, and a second support valve provided on a second auxiliary hydraulic pressure flow path for transmitting the pressurizing medium pressurized by the other of the pair of pumps to a second wheel cylinder to control the flow of the pressurizing medium, a pressure sensor configured to detect pressures of the pressurizing media transmitted to the first support valve and the second support valve from the pair of pumps, and a controller configured to control the hydraulic pressure supply device, the hydraulic pressure control unit, and the hydraulic pressure auxiliary device, wherein the controller is configured to estimate a wheel pressure of at least one control target wheel cylinder of the first wheel cylinder and the second wheel cylinder during ABS control in a first fallback mode performed by the hydraulic pressure auxiliary device, synchronize an upstream pressure and a downstream pressure of at least one control target support valve of the first support valve and the second support valve, and compensate the estimated wheel pressure of the control target wheel cylinder to be a pressure detected by the pressure sensor during the synchronization.

A two-way fluid actuator assembly (100) comprising: a first cylinder-piston device (10) comprising a first cylinder (12) and a first piston (11) sliding inside said first cylinder (12) along a first axis (PA), forming a first variable-volume chamber (14) between said first cylinder (12) and said first piston (11) as a function of a relative position between said first cylinder (12) and said first piston (11), a first rolling-diaphragm fluid-tight element (13) between said first cylinder (12) and said first piston (11); a first hydraulic pipe (8) having a first end communicating with said first variable-volume chamber (14); a second cylinder-piston device ((2200)) comprising a second cylinder (22) and a second piston (21) sliding inside said second cylinder (22) along a second axis (SA), forming a second variable-volume chamber (24) between said second cylinder (22) and said second piston (21) as a function of a relative position between said second cylinder (22) and said second piston (21), a second rolling-diaphragm fluid-tight element (23) between said second cylinder (22) and said second piston (21); a second hydraulic pipe (9) having a first end communicating with said second variable-volume chamber (24); a linear actuator device (5) comprising a translating element (1) arranged to translate along a translation axis (T) wherein the remaining movements of said translating element (1) are prevented, a rotating element (2) arranged to rotate about said translation axis (T) constrained in all remaining movements, wherein the translating element (1) and the rotating element (2) are engaged with each other by means of a helical kinematic couple, the linear actuator device (5) comprising an electric motor (3) connected to said rotating element (2) to rotate said rotating element (2), wherein said first cylinder-piston device (10) and said second cylinder-piston device (20) are connected to said translating element (1) on opposite sides with respect to the translation direction (T) so that a translation of said translating element (1) corresponds to a compression of one of said first variable-volume chamber (14) and said second variable-volume chamber (24) and a simultaneous expansion of the other of said first variable-volume chamber (14) and said second variable-volume chamber (24).

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 actuating device 12 for actuating a clutch device 30 is provided, comprising a concentric slave cylinder 13, which has an annular piston 15 and an annular housing 14, wherein the annular piston 15 is axially movably received in an annular space 31 of the annular housing 14 which revolves around the main axis 100 and limits the annular space 31 axially with respect to the main axis 100, so that a pressure chamber 16 which can be filled with a hydraulic fluid is formed between the annular piston 15 and the annular housing 14, and comprising a housing section 18, wherein the annular housing 14 is received in the housing section 18 and an intermediate pressure chamber 16 which revolves around the axis of rotation 100 is formed radially between the annular housing 14 and the housing section 18.which is fluidically connected on the one hand to the pressure chamber 16 via at least one fluid opening 17 formed in the annular housing 14 and on the other hand to a pressure connection 21 via a pressure connection opening 20 formed in the housing section 16, wherein a hydraulic brake 44 is formed between the pressure connection 21 and the pressure chamber 16 to increase a flow resistance in the intermediate pressure chamber 19, which slows down a pulsating flow of a hydraulic fluid displaced by the annular piston 15 when the annular piston 15 moves.

The invention relates to a hydraulic actuator (1) having the ability to recover energy from the pressure of a hydraulic fluid, having at least one bidirectionally operable hydraulic pump (2) for pumping the hydraulic fluid, the hydraulic pump (2) having two ports (6a, 6b); and a hydraulic actuator assembly (3) having two hydraulic fluid chambers (4a, 4b) to which hydraulic fluid can be applied in order to drive the hydraulic actuator assembly (3), in which the hydraulic fluid chambers (4a, 4b) are each connected to the ports (6a, 6b) of the hydraulic pump (2) by means of pipelines (7a, 7b), such that when one of the hydraulic fluid chambers (4a, 4b) is filled with hydraulic fluid, the hydraulic fluid is supplied to the hydraulic actuator assembly (3). The second chamber (4b) has a second chamber cross-section (8b) which is different from the first chamber cross-section (8a) of the first chamber (4a), and wherein the first chamber (4a) is connected to a pressure accumulator (5), and wherein the second chamber cross-section (8b) of the second chamber (4b) is different from the first chamber cross-section (8a) of the first chamber (4a). A differential volume (28) can be received and provided in the pressure accumulator, the differential volume (28) being caused by 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), 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 each other by a bypass line (9) by means of which when the pressure in the second line (7b) drops from above to a threshold value, the pressure in the second line (7b) drops from above to the threshold value. According to the invention, a bypass flow from the first line (7a) into the second line (7b) is established via a bypass line (9) in order to prevent an insufficient supply of hydraulic fluid in the hydraulic pump (2), a deactivation circuit (11) being arranged in the bypass line (9), by means of which the bypass line (9) can be interrupted when the pressure in the second line (7b) is above a threshold value.

Slide valve (V3) comprising a valve element (111) and a cylinder (112) with a bore (112a) that accommodates the valve element (111) to be movable in an axial direction, and designed such that when the valve element (111) moves in an initial position in the axial direction relative to the cylinder (112), a supply valve port (Vi) formed between the valve element (111) and the cylinder (112) opens, thereby introducing a working fluid from a hydraulic pressure source (31) through the supply valve port (Vi) into a hydraulic chamber, wherein a throttle section (O3) is provided in a fluid channel formed between the supply valve port (Vi) and the hydraulic pressure source (31), or in a fluid channel formed between the supply valve port (Vi) and the hydraulic chamber, wherein the throttle section (O3) is designed such that the area of ​​an opening formed between the valve element (111) and the cylinder (112) is constant in a throttle effectiveness range extending from the initial position to a position where the magnitude of an axial movement of the valve element (111) from the initial position becomes equal to a predetermined value, and the area of ​​the opening increases in a throttle ineffective range where the magnitude of an axial movement of the valve element (111) exceeds the predetermined value. characterized by the fact that the throttle section (O3) is provided at a position axially offset by a predetermined amount from one end of a wall surface of the bore (112a) of the cylinder (112), the end of which forms the feed valve port (Vi); wherein the throttle section (O3) is formed by an outer circumferential surface of the valve element (111) and a cylindrical projection (112e1) having a predetermined thickness and extending along the entire circumference of an inner end of a connecting hole (112e) formed in the cylinder (112) and communicating with the bore (112a) of the cylinder (112) at its inner end; and wherein a recess (112g) is formed between the cylindrical projection (112e1) and the end of the wall surface of the bore (112a) of the cylinder (112), the end of which forms the feed valve port (Vi), and the connecting hole (112e) and the cylindrical projection (112e1) are formed by a tube (P) which is fluid-tightly joined to the cylinder (112).

The invention relates to a computer-implemented method for controlling an electro-hydraulic drive network, the network comprising n hydraulic cylinders (10, 12) each having two chambers (20, 22, 24, 28), n-1 chamber short-circuiting's between the cylinder's chambers, and n+1 displacement units (14, 16, 18), the method comprises generating a signal for the displacement units (14, 16, 18), wherein the signals for the displacement units (14, 16, 18) are generated from a representation of an aimed rod velocity, wherein the representation of the aimed rod velocity is determined using a piston speed reference and system level active damping functions for each of the n hydraulic cylinders (10, 12), wherein the system level active damping functions describe the influence of the hydraulic cylinders (10, 12) on the oscillatory behavior of the mounting system.

The invention relates to a thrust reverser device for an aircraft turbojet engine nacelle, having an electro-hydrostatic actuation system, the electro-hydrostatic system comprising a motor pump (106) and a first actuation assembly (E) formed by: - a series of at least two actuators (A1, A2) intended to be attached to a movable cover of the thrust reverser and configured to move the movable cover or covers between a retracted position and a deployed position relative to the nacelle; and - a volumetric flow divider (120) having an inlet connected to the motor pump (106) and at least two outlets, each connected to an actuator (A1, A2), the volumetric flow divider (120) being configured to receive a fluid and to supply the fluid to the actuators with a substantially equal flow rate.

The present disclosure shows a hydraulic regeneration circuit for a hydraulic cylinder that enables multiple extension speeds for the cylinder even while using fixed displacement pumps. The regeneration circuit uses the expelled fluid to drive a hydraulic pump / motor combination to create 4 or more speeds, as opposed to the 2 speeds typical in regeneration circuits. By using directional flow control valves, the fluid can be combined in such a way that the operator can choose a speed multiplier for the hydraulic cylinder to operate at.

An electro-hydrostatic actuator, EHA, assembly comprising: a power line (200), and a one-piece, integral housing (100) housing a hydraulic control block, a power control module, PCM, and a motor-pump assembly, the integral housing (100) comprising a passage through which the power line (200) passes.

Disclosed herein are various embodiments of a hydraulic actuator that includes one or more check valves having a dynamically varying cracking pressure. In certain embodiments, a hydraulic actuator may be configured to vary the cracking pressure of a check valve based on an operating condition of a pump of the hydraulic actuator. The check valve may be located along a bypass path in the hydraulic actuator, thereby allowing for fluid flow to bypass a pump of the hydraulic actuator by passing through the check valve. The use of such hydraulic actuators is contemplated in, for example, an active suspension system of a vehicle.Additionally, various embodiments of suitable check valves are disclosed. Additionally, methods are disclosed for operation of the check valve and the hydraulic actuator.

2. Method for positioning an actuator (12), in particular in the form of a hydraulic working cylinder (14) which is connected to a hydraulic supply circuit (10) with a pressure supply device (32) in the form of a motor-pump group (34), characterized in that during the movement process of the actuator (12) a theoretical position s (t) is determined by means of the hydraulic transmission ratio between the pump (36) and the actuator (12) taking into account the respective current rotational speed n of the motor (M). zyl - and actual speed value v (t) zyl is calculated and that at least this theoretical actual position value serves as the actual value of a position controller for a motor control (FU) of the motor-pump group (34).

The invention relates to a hydraulic drive system, to a method for adjusting a delivery volume in a hydraulic drive system, and to the use of the hydraulic drive system for controlling a hydraulic cylinder. The hydraulic drive system according to the invention is a hydraulic drive system with a first hydraulic machine and a second hydraulic machine which are connected mechanically to one another. The first hydraulic machine and the second hydraulic machine are operated jointly by a variable-speed drive. The first hydraulic machine and the second hydraulic machine are connected hydraulically to at least one first hydraulic cylinder, comprising a first hydraulic cylinder surface and a second hydraulic cylinder surface. The first hydraulic machine and / or the second hydraulic machine have / has an adjustable delivery volume.

The present invention discloses a parallel twin-cylinder brake pump, which includes an integral master cylinder casting body, a primary actuator piston component, a secondary actuator piston component, a sealing piston component, a main return spring, a U-shaped connecting oil pipe between the master cylinders, a secondary actuator piston limiting component, a sealing piston limiting component, a connecting rod fixing component, a brake pedal connecting component, a cross stop-and-pass valve core, and a sliding guiding rod for the primary actuator piston component. Wherein, a directly communicating primary chamber and secondary chamber are provided inside the integral master cylinder casting body; the primary actuator piston component is slidably installed in the primary chamber and the secondary chamber; a pressurizing and liquid supplementing chamber is provided inside the primary actuator piston component; the secondary actuator piston component is slidably installed in the pressurizing and liquid supplementing chamber; and the sealing piston component is slidably installed in the primary chamber.

Disclosed herein are various embodiments of a hydraulic actuator that includes one or more check valves having a dynamically varying cracking pressure. In certain embodiments, a hydraulic actuator may be configured to vary the cracking pressure of a check valve based on an operating condition of a pump of the hydraulic actuator. The check valve may be located along a bypass path in the hydraulic actuator, thereby allowing for fluid flow to bypass a pump of the hydraulic actuator by passing through the check valve. The use of such hydraulic actuators is contemplated in, for example, an active suspension system of a vehicle. Additionally, various embodiments of suitable check valves are disclosed. Additionally, methods are disclosed for operation of the check valve and the hydraulic actuator.