23results about "Servomotor parallel arrangements" patented technology

The subject matter of this specification can be embodied in, among other things, an apparatus that includes a first assembly having a first piston rod having a first rod end, a second assembly arranged substantially parallel to the first piston assembly and having a second piston rod having a second rod end, an end assembly defining a first aperture configured to receive the first rod end, and a second aperture configured to receive the second rod end, a first retaining cap configured to affix to the first rod end, abut the end assembly when affixed to the first rod end, and retain the first rod end within the first aperture, and a second retaining cap configured to affix to the second rod end, abut the end assembly when affixed to the second rod end, and retain the second rod end within the second aperture.

The subject matter of this specification can be embodied in, among other things, a method that includes controlling, by a first fluid valve, a first fluid flow to a first fluid actuator, actuating, by the first fluid actuator, an output, controlling, by a second fluid valve, a second fluid flow to a second fluid actuator, and actuating, by the second fluid actuator, the output.

A servo valve includes a housing defining a wetted zone for holding a fluid. The servo valve includes a fluid transfer valve assembly disposed in the housing. The fluid transfer valve assembly comprises a fluid supply port and a control port. A spool is arranged to control flow of fluid through a fluid pathway from the fluid supply port to the control port. The spool is movable along a spool axis. A lever is pivotally mounted to the housing and engaged with the spool via a hinged connection. The lever is arranged to pivot and axially move the spool along the spool axis. A seal is provided to isolate the wetted zone from a non-wetted zone. The spool is positioned within the wetted zone and the lever is positioned at least partially within the wetted zone.

The subject matter of this specification can be embodied in, among other things, an apparatus that includes a first assembly having a first piston rod having a first rod end, a second assembly arranged substantially parallel to the first piston assembly and having a second piston rod having a second rod end, an end assembly defining a first aperture configured to receive the first rod end, and a second aperture configured to receive the second rod end, a first retaining cap configured to affix to the first rod end, abut the end assembly when affixed to the first rod end, and retain the first rod end within the first aperture, and a second retaining cap configured to affix to the second rod end, abut the end assembly when affixed to the second rod end, and retain the second rod end within the second aperture.

A servo valve comprises a housing (11) defining a wetted zone for holding a fluid. The servo valve includes a fluid transfer valve assembly (22) disposed in the housing (11). The fluid transfer valve assembly (22) comprises a fluid supply port (16) and a control port (18). A spool (12) is arranged to control flow of fluid through a fluid pathway from the fluid supply port (16) to the control port (18). The spool (12) is movable along a spool axis (14). A lever (28) is pivotally mounted to the housing (11) and engaged with the spool (12) via a hinged connection (24). The lever (28) is arranged to pivot and axially move the spool (12) along the spool axis (14). A seal (26) is provided to isolate the wetted zone from a non-wetted zone. The spool (12) is positioned within the wetted zone and the lever (28) is positioned at least partially within the wetted zone.

The invention relates to a hydraulic system (20) for a working machine (10). The hydraulic system (20) comprises: - a feeding pump (22); - a plurality of variable displacement hydraulic machines (26, 28, 30, 32) being connected in parallel to the feeding pump (22); - at least one (26, 28), preferably a plurality, of the variable displacement hydraulic machines (26, 28, 30, 32) being adapted to drive a ground engagement element (12, 14) of the working machine (10), and - at least one of the variable displacement hydraulic machines (26, 28, 30, 32) is adapted to drive a vibrator (34, 36) for vibrating a ground engagement element (12, 14) of the working machine (10).

An actuator system can include a first actuator (101a), a second actuator (101b), a first actuator control device (103a) configured to control the first actuator, a second actuator control device (103b) configured to control the second actuator, a shared redundant actuator control device (103c), and at least one transfer device (105) operatively connected to the first, second, and shared redundant actuator control devices. The at least one transfer device can be configured to be operated to select between a first control mode where the first actuator control device is operatively connected to the first actuator to control the first actuator and the second actuator control device is operatively connected to the second actuator to control the second actuator, a second control mode where the shared redundant actuator control device is operatively connected to the first actuator to control the first actuator and the second actuator control device is operatively connected to the second actuator to control the second actuator, and a third control mode where the first actuator control device is operatively connected to the first actuator to control the first actuator and the shared redundant actuator control device is operatively connected to the second actuator to control the second actuator.

A direct drive valve for controlling fluid flow, includes a flow spool operable to control fluid flow through the direct drive valve; a control spool located within the flow spool and an actuator operable to drive the control spool relative to the flow spool. The direct drive valve is configured such that in use movement of the control spool relative to the flow spool causes the flow spool to be actuated by fluid pressure.

The subject matter of this specification can be embodied in, among other things, a method that includes controlling, by a first fluid valve, a first fluid flow to a first fluid actuator, actuating, by the first fluid actuator, an output, controlling, by a second fluid valve, a second fluid flow to a second fluid actuator, and actuating, by the second fluid actuator, the output.

A fluid system (10) is provided that includes a first actuator (16A), a second actuator (16B) and a valve system (18). The valve system (18) includes a first control valve (24A), a second control valve (24B) and a transfer valve (26). During a first mode of operation, the transfer valve (26) is configured to fluidly couple the first control valve (24A) to the first actuator (16A) and fluidly couple the second control valve (24B) to the second actuator (16B), and the transfer valve (26) is also configured to fluidly decouple the first control valve (24A) from the second actuator (16B) and fluidly decouple the second control valve (24B) from the first actuator (16A). During a second mode of operation, the transfer valve (26) is configured to fluidly couple the first control valve (24A) to the first actuator (16A) and the second actuator (16B), and the transfer valve (26) is also configured to fluidly decouple the second control valve (24B) from the first actuator (16A) and the second actuator (16B).

A system includes a first electrohydraulic servo valve (EHSV) configured to be in fluid communication with a pressure supply and with a pressure return. The first EHSV includes a first actuator extend line and a first actuator retract line. A second EHSV is configured to be in fluid communication with the pressure supply and with the pressure return. The second EHSV includes a second actuator extend line and a second actuator retract line. An actuator includes an extend chamber in fluid communication with both of the first and second extend actuator lines, and a retract chamber in fluid communication with both of the first and second retract actuator lines for extending an end effector when the first and second EHSVs pressurize the extend chamber, and for retracting the end effector when the first and second EHSVs pressurize the retract chamber.

The utility model discloses an integrated multi-force air cylinder which comprises a plurality of air cylinder assemblies combined in parallel. Each air cylinder assembly comprises a plurality of single air cylinders combined in series, at least one series connection assembly penetrating through all the single air cylinders one by one, a base fixed to the first end of the series connection assembly and a rear cover fixed to the second end of the series connection assembly. Each single air cylinder comprises a cylinder barrel provided with an inner cavity and a piston assembly arranged in the inner cavity of the cylinder barrel. In the same air cylinder assembly, the piston assemblies of every two adjacent single air cylinders are connected in an inserted mode. Multiple-force output is achieved by connecting the single air cylinders in series to form the air cylinder assemblies, the integrated multiple-force air cylinder is formed by connecting the air cylinder assemblies in parallel, multi-station machining can be carried out at a time, the overall structure is compact, working efficiency is improved, occupied space for installation is reduced, installation and debugging difficulty is lowered, and air path design can be simplified.

This invention provides an electro-hydraulic hybrid actuator capable of maintaining balance of moments between parallel-arranged electric actuators and hydraulic actuators. [Solution] An electro-hydraulic hybrid actuator comprising a hydraulic drive unit 1, electric drive units 2a, 2b, a thrust connection unit 3 that receives thrust from the hydraulic drive unit and the electric drive unit, and an operating output unit 5a operated by the thrust connection unit, characterized in that at least two of the electric drive units are symmetrically arranged based on the arrangement of the hydraulic drive unit. By arranging the multiple electric drive units symmetrically around the axis of the hydraulic drive unit, an electro-hydraulic hybrid actuator is obtained that can maintain a balance of moments between each drive unit.

To enable a work machine to be smoothly decelerated according to traveling of the work machine.SOLUTION: A work machine has a control device that automatically decelerates a first revolving speed of a left travel motor capable of transmitting power to a left travel device provided on a left side of a machine body and a second revolving speed of a right travel motor capable of transmitting the power to a right travel device provided on a right side of the machine body from a second speed in a prescribed high speed range to a first speed in a prescribed low speed range. The control device does not automatically decelerate when either one of the first revolving speed or the second revolving speed is equal to or higher than a prescribed revolving speed.SELECTED DRAWING: Figure 1

A fluid system is provided that includes a first actuator, a second actuator and a valve system. The valve system includes a first control valve, a second control valve and a transfer valve. During a first mode of operation, the transfer valve is configured to fluidly couple the first control valve to the first actuator and fluidly couple the second control valve to the second actuator, and the transfer valve is also configured to fluidly decouple the first control valve from the second actuator and fluidly decouple the second control valve from the first actuator. During a second mode of operation, the transfer valve is configured to fluidly couple the first control valve to the first actuator and the second actuator, and the transfer valve is also configured to fluidly decouple the second control valve from the first actuator and the second actuator.

The utility model relates to the technical field of parallel hydraulic cylinders, in particular to a parallel hydraulic cylinder structure which comprises a mounting seat, and a first hydraulic cylinder is mounted on one side of the top end of the mounting seat. The first hydraulic cylinder and the second hydraulic cylinder are symmetrically mounted on the two sides of the mounting base, the support is mounted in the middle of the top end of the mounting base, and meanwhile the forced synchronization assembly composed of the first connecting rod, the connecting column, the synchronous rotating rod and the second connecting rod is jointly mounted between the support and piston rods of the first hydraulic cylinder and the second hydraulic cylinder; when the parallel hydraulic cylinder is used, synchronous stretching and retracting of piston rods on the first hydraulic cylinder and the second hydraulic cylinder can be achieved under the action of the forced synchronization assembly, and the defect that stretching and retracting of the first hydraulic cylinder and stretching and retracting of the second hydraulic cylinder are not synchronous due to adjustment errors of an oil inlet flow valve and an oil outlet flow valve is overcome. Therefore, when the parallel hydraulic cylinder is used, the problems of equipment damage, poor precision, large energy consumption and the like cannot be caused, and the reliability is better.

Apparatus and associated methods relate to a transfer valve with dual authority control porting. The transfer valve has a hydraulic cylinder having a cylindrical wall extending between first and second ends. The cylindrical wall has hydraulic ports therethrough for facilitating operation of the transfer valve. Within the hydraulic cylinder, a bilaterally moveable spool is axially moveable between first and second positions. The bilaterally moveable spool defines hydraulic chambers within the hydraulic cylinder. In the first position, the hydraulic chambers and the hydraulic ports form a fluidly conductive path between a first source and a first application, and another between a second source and a second application. In the second position, the cavities and the hydraulic ports form a fluidly conductive path between the first source and the second application, and another between spool positioning cavities of the transfer valve and the first application.

A fluid system (10) is provided that includes a first actuator (16A), a second actuator (16B) and a valve system (18). The valve system (18) includes a first control valve (24A), a second control valve (24B) and a transfer valve (26). During a first mode of operation, the transfer valve (26) is configured to fluidly couple the first control valve (24A) to the first actuator (16A) and fluidly couple the second control valve (24B) to the second actuator (16B), and the transfer valve (26) is also configured to fluidly decouple the first control valve (24A) from the second actuator (16B) and fluidly decouple the second control valve (24B) from the first actuator (16A). During a second mode of operation, the transfer valve (26) is configured to fluidly couple the first control valve (24A) to the first actuator (16A) and the second actuator (16B), and the transfer valve (26) is also configured to fluidly decouple the second control valve (24B) from the first actuator (16A) and the second actuator (16B).

The present invention is directed to a metering valve for controlling the amount of a fluid passed through the valve and a servo-valve for controlling the metering valve, wherein the servo-valve is decoupled from the metering valve to thermally distance or thermally isolate the servo-valve from any heat from the fluid passing through the metering valve. The metering valve and servo-valve may be used to attemperate a steam stream in a power plant attemperation system, such as a system for attemperating a superheated steam gas stream from a power plant being used for a heat-recovery steam generator. An integrated metering valve and discharge valve for discharging fluid during periods of non-use is also provide. Changeable throttle plates are also provided that control the flow of the fluid through the control chamber of the metering valve and the discharge valve.

The subject matter of this specification can be embodied, inter alia, in an apparatus comprising: a first assembly having a first piston rod having a first rod end; a second assembly disposed substantially parallel to the first piston assembly and having a second piston rod having a second rod end; an end assembly defining a first aperture configured to receive the first rod end and a second aperture configured to receive the second rod end; a first retention cap configured to attach to the first rod end, abut the end assembly when attached to the first rod end, and retain the first rod end within the first aperture; and a second retention cap configured to attach to the second rod end, abut the end assembly when attached to the second rod end, and retain the second rod end within the second aperture.

A direct drive valve (10) for controlling fluid flow, comprising: a flow spool (60) operable to control fluid flow through the direct drive valve (10); a control spool (80) located within the flow spool (60); and an actuator (120) operable to drive the control spool (80) relative to the flow spool (60), wherein the direct drive valve (10) is configured such that in use movement of the control spool (80) relative to the flow spool (60) causes the flow spool (60) to be actuated by fluid pressure.

A hydraulic system having two hydraulic circuits 6, 7, each having a consumer 14, 15 and a variable pump 2, 3. The two pumps are jointly driven by a common motor 4. The two circuits can be selectively

The subject matter of this specification can be embodied in, among other things, an apparatus that includes a first assembly having a first piston rod having a first rod end, a second assembly arranged substantially parallel to the first piston assembly and having a second piston rod having a second rod end, an end assembly defining a first aperture configured to receive the first rod end, and a second aperture configured to receive the second rod end, a first retaining cap configured to affix to the first rod end, abut the end assembly when affixed to the first rod end, and retain the first rod end within the first aperture, and a second retaining cap configured to affix to the second rod end, abut the end assembly when affixed to the second rod end, and retain the second rod end within the second aperture.