A system includes a hydraulic energy transfer system configured to exchange pressures between a first fluid and a second fluid, wherein pressure of the first fluid is greater than pressure of the second fluid. The system also includes a lubrication system coupled to the hydraulic energy transfer system and configured to pump or direct a lubrication fluid into the hydraulic energy transfer system.

A plug for retaining a filter screen in a fluid port of a servovalve, the plug comprises an annular body. The annular body comprises opposed first and second axial annular end surfaces. A radially inner surface extends between the first and second axial annular end surfaces and a radially outer surface extends between the first and second axial annular end surfaces. At least one recess is formed in the radially inner surface for receiving a tool for removing the plug from the port. A plurality of slots is formed in the first axial annular end surface and extends into the at least one recess for providing access for the tool to the at least one recess.

An electromagnet for a hydraulic system, such as an automatic transmission of a motor vehicle. The electromagnet may include an armature chamber filled with hydraulic medium, which may be fluidically connected to hydraulic lines of the hydraulic system, and may have an armature mounted therein. The armature may have an adjustable stroke and may include a shut-off body. The armature may divide the armature chamber into an opening-side chamber facing the flow opening, and an inner chamber facing away from it. During a stroke movement of the armature, an oil exchange may occur, during which a displacement volume of the hydraulic medium overflows from the opening-side chamber into the inner chamber. The electromagnet may further include a hydraulic medium reservoir, which may store a hydraulic medium having a higher degree of purity than the hydraulic medium in the hydraulic lines and which may be fluidically connected to the opening-side chamber.

An electromagnet for a hydraulic system, such as an automatic transmission of a motor vehicle. The electromagnet may include an armature chamber filled with hydraulic medium, which may be fluidically connected to hydraulic lines of the hydraulic system, and may have an armature mounted therein. The armature may have an adjustable stroke and may include a shut-off body. The armature may divide the armature chamber into an opening-side chamber facing the flow opening, and an inner chamber facing away from it. During a stroke movement of the armature, an oil exchange may occur, during which a displacement volume of the hydraulic medium overflows from the opening-side chamber into the inner chamber. The electromagnet may further include a hydraulic medium reservoir, which may store a hydraulic medium having a higher degree of purity than the hydraulic medium in the hydraulic lines and which may be fluidically connected to the opening-side chamber.

In order to be able to easily check the state of foreign matter contained in oil regardless of an installation location, a device main body 10 having a housing chamber 11 in which oil is stored, a plug 20 attached to a bottom portion of the housing chamber 11 in a state where an end surface of a shaft portion 20a faces upward, a spacer member 30 formed by a transparent member and arranged on the plug 20 in such a manner that one end surface 30a faces an inside of the housing chamber 11; and an imaging unit 40 arranged on the plug 20, the imaging unit 40 imaging the inside of the housing chamber 11 via the spacer member 30 are provided.

In order to be able to easily check the state of foreign matter contained in oil regardless of an installation location, a device main body 10 having a housing chamber 11 in which oil is stored, a plug 20 attached to a bottom portion of the housing chamber 11 in a state where an end surface of a shaft portion 20a faces upward, a spacer member 30 formed by a transparent member and arranged on the plug 20 in such a manner that one end surface 30a faces an inside of the housing chamber 11; and an imaging unit 40 arranged on the plug 20, the imaging unit 40 imaging the inside of the housing chamber 11 via the spacer member 30 are provided.

Systems and method determine a fluid efficiency of a fluid that flows through a fluid power system. Characteristics of the fluid is monitored in real-time as the fluid flows through the fluid monitoring device that is coupled to the fluid power system as the fluid flows through the fluid power system. A fluid status is determined in real-time that is associated with fluid parameters of the fluid that is determined from the fluid parameters detected by the fluid monitoring device. The fluid status of the fluid is determined in real-time when the fluid status indicates that a corrective action is to be executed to increase a quality of the fluid and an assessment of the corrective action that is to be executed is generated based on the fluid parameters. Degradation of the components of the fluid power system increases without the corrective action being executed to the fluid.

A length-adjustable connecting rod for a reciprocating piston machine, which may be a reciprocating piston internal combustion engine, is disclosed as well as a reciprocating piston machine and a vehicle. The connecting rod comprises a hydraulic length-adjusting device for adjusting an effective connecting rod length and a control device that can switch between two switching states, for controlling the length-adjusting device. The length-adjusting device comprises a hydraulic cylinder with a piston and a first hydraulic working chamber and a second hydraulic working chamber, the control device comprising a first valve and a second valve, the first valve of the control device being connected to the first hydraulic working chamber of the length-adjusting device in a fluid-communicating manner, and the second valve to the second hydraulic working chamber, the first valve and the second valve each being actuatable by means of a hydraulically actuatable adjusting piston that can axially move along an adjusting axis, the adjusting axis of the first valve being different from the adjusting axis of the second valve.

A filter band assembly for a solenoid-actuated valve includes a filter band adapted to be disposed about a valve body of the solenoid-actuated valve. The filter band has a first end at one end and a second end at another end. The filter band assembly also includes a separate bracket affixed to one of the first end and the second end and adapted to support the one of the first end and the second end on the valve body to allow the first end and the second end to be joined together in a closed position.

A filter band assembly for a solenoid-actuated valve includes a filter band adapted to be disposed about a valve body of the solenoid-actuated valve. The filter band has a first end at one end and a second end at another end. The filter band assembly also includes a separate bracket affixed to one of the first end and the second end and adapted to support the one of the first end and the second end on the valve body to allow the first end and the second end to be joined together in a closed position.