Disclosure herein are hydraulic systems and method of use thereof. The hydraulic systems can include a hydraulic cylinder and a manifold. The hydraulic cylinder can have a first end and a second end. The hydraulic cylinder can include a first port, a second port, and a third port. The first port can be located proximate the first end. The second port cane be located proximate the second end. The third port can be located in between the first port and the second port. The manifold can include a first valve and a second valve. The first valve can be in fluid communication with the first port and the third port. The second valve can be in fluid communication with the second port and the third port.

An actuator according to an aspect of the present invention includes: a driving body including a plurality of conductive grains, a chamber configured to confine the plurality of conductive grains, and two or more electrodes disposed on a surface of the chamber; and a controller configured to obtain, through the two or more electrodes, a change in an electric signal, in response to a load applied to the chamber, and to adjust the load applied to the chamber based on the change in the electric signal.

Sod harvesters can have hydraulic systems that are configured to actuate components with precise timing. The hydraulic system of a sod harvester can be configured to maintain the temperature of hydraulic fluid both during harvesting and while harvesting is paused to thereby eliminate or minimize the occurrence of periods of variation in the timing of actuation of the components that the hydraulic fluid drives. As a result, these components can be consistently actuated with precise timing even after harvesting has been paused. Additionally, such configurations can minimize the amount of time required to warm the hydraulic fluid to a steady operational temperature.

A device and a system for controlling the turning of an object includes a shaft enclosing a first space, and a sleeve forming a second space between the shaft and the sleeve. Movement of the sleeve is transmitted to movement of the object. The device further comprises a housing comprising means for rotating the shaft and at least one inlet for a lubricant, and a lubricant collector. The shaft has a first through hole extending from the first space to the second space, and the sleeve has at least a second through hole for providing the second space in fluid communication with the lubricant collector. The housing is in fluid communication with the second space, and the first space is pressurizeable for causing the lubricant in the second space to be displaced through the second through hole and collected in the lubricant collector.

A fluid actuated linear drive which includes a drive housing and a drive member which is movable relative to the drive housing. The drive force which is necessary for producing the drive movement is provided by a drive fluid which can be fed and discharged through housing channels of the drive housing. The housing channels each with a lateral coupling opening run out at a housing side surface of the drive housing. An L-shaped attachment coupling part which in the position of use is assembled on the drive housing has a coupling limb which is assigned to a housing rear surface and which is provided with two axial coupling openings. The axial coupling openings are in connection with lateral coupling openings via coupling channels. Hence there is the possibility of using the axial coupling openings for the feed and discharge of the drive fluid.

Disclosed are seal arrangements in a hydraulic device. The seal arrangement includes a seal channel defining a loop. A seal is seated within the seal channel. A coolant flow passage has a first part intersecting with the seal channel at a first point and a second part intersecting with the seal channel at a second point. The first part of the coolant flow passage is configured to provide hydraulic fluid to the seal channel such that, at the first point, a first portion of the hydraulic fluid flows in a first direction around the loop and a second portion of the hydraulic fluid flows in a second direction opposite to the first direction around the loop. At the second point, the first portion of hydraulic fluid and the second portion of hydraulic fluid are configured to flow into the second part of the coolant flow passage.

Provided is a cylinder device capable of preventing rotation unevenness while reducing power consumption and achieving compactification in particular. The present invention is to provide a cylinder device including a cylinder body and a shaft member supported in the cylinder body, the cylinder body being provided with a rotation port that communicates with an outer circumferential surface around the shaft member and rotates the shaft member based on a supply and discharge of a fluid. Thus, it is possible to prevent rotation unevenness while reducing power consumption and achieving compactification.

Cushion holes are provided in cover members, tubular cushion rings are provided on a piston and a piston rod so as to be insertable into and withdrawable from the cushion holes as the piston moves, cushion packings capable of slidably contacting the outer circumference of the cushion rings are mounted to be movable in an axial direction, in mounting grooves formed on inner walls of the cover members constituting the cushion holes, the cushion packings each include a plurality of protrusions extending from the outer circumferential surface to the side surface near the piston and disposed circumferentially alongside one another, and cushioning grooves that extend in parallel with the axis of the cushion rings and whose cross-sectional area changes are formed on the outer circumferential surface of the cushion rings.

A self-setting valve assembly for a power steering gear assembly includes a plug, a first plunger, a second plunger, and a biasing member. The plug extends between a first end and a second end. The plug defines a cavity that is disposed between the first end and the second end, a first bore that extends from the first end to the cavity, and a second bore that extends from the second end to the cavity. The first plunger has a first head that is disposed within the cavity and a first stem that extends from the first head through the first bore. The second plunger has a second head that is disposed within the cavity and a second stem that extends from the first head through the second bore. The biasing member is disposed within the bore and extending between the first head and the second head.

A control unit for pneumatic actuation of a cylinder, in particular an active creel of a textile-processing machine or a cabling machine, having a compressed air inlet for connecting a compressed air supply, a working air outlet for operating the cylinder, which acts at least on one side, a valve unit arranged between the compressed air inlet and the working air outlet, and an operating element for opening the valve unit to trigger a lifting movement of the cylinder. In order to provide a control unit for pneumatic actuation of an active creel, the actuation of the creel being particularly simple by the control unit, so that an operator can use the creel more easily, quickly and safely, and in addition the creel is protected from damage by incorrect operation, the control unit for achieving a self-retaining valve function, in which the lifting movement of the cylinder is fully executed with a single and/or brief actuation of the operating element, and for the control unit is connected to an end position sensor of the cylinder such that, when the end position sensor is activated, the valve unit is closed and/or the cylinder connected to the working air outlet is automatically depressurized when or after an end position is reached.