A hydraulic actuation device includes a tool, an actuation part having a pressure oil supply mechanism configured to send pressure oil from an oil chamber to the tool and return return oil from the tool to the oil chamber, an operation handle for adjusting oil passages for the pressure oil and the return oil in the pressure oil supply mechanism and configured to be able to be moved from an initial position, and biasing means configured to bias the operation handle toward the initial position when no external force is applied to the operation handle. When the operation handle moves from the initial position, the tool is actuated by the actuation part. When the operation handle is returned to the initial position by the biasing means, operation of the tool by the actuation part is stopped.

A lubricant pump for conveying lubricant from a lubricant reservoir to a pump outlet includes a pump housing with a longitudinal axis. The pump housing has a receiving opening for a pump unit, a lubricant inlet opening and a lubricant outlet opening opening into the receiving opening, a pump drive, and a pump unit with a reciprocatingly movable delivery piston. The pump unit has a suction opening, which corresponds with the lubricant outlet opening when the pump unit is inserted into the receiving opening, and an outlet opening for lubricant. A coupling mechanism for driving the at least one pump unit includes an eccentric element which is rotatable about the longitudinal axis, a drive-side coupling section connected to the eccentric element, and a pump-side coupling section. The drive-side coupling section and the pump-side coupling section can be connected to one another automatically via a resilient latching connection.

A lubricant pump for conveying lubricant from a lubricant reservoir to a pump outlet includes a pump housing with a longitudinal axis. The pump housing has a receiving opening for a pump unit, a lubricant inlet opening and a lubricant outlet opening opening into the receiving opening, a pump drive, and a pump unit with a reciprocatingly movable delivery piston. The pump unit has a suction opening, which corresponds with the lubricant outlet opening when the pump unit is inserted into the receiving opening, and an outlet opening for lubricant. A coupling mechanism for driving the at least one pump unit includes an eccentric element which is rotatable about the longitudinal axis, a drive-side coupling section connected to the eccentric element, and a pump-side coupling section. The drive-side coupling section and the pump-side coupling section can be connected to one another automatically via a resilient latching connection.

A partial stroke pump or motor includes a piston coupled to a rotating shaft to evacuate a fluid within a cylinder during an upstroke. A latching check valve includes an actuator piston that is displaceable within a center cavity to bypass a blocking member in a bypass state. The actuator piston is driven by a latch supply line. A spool of a rotary valve selectively couples one of the low and pilot pressure supplies to the latch supply line over different timing angle ranges of the rotating shaft. Coupling of the pilot pressure to the latch supply line causes the bypass state. When operating as a pump, the bypass state causes the pressure in the cylinder to fall below the high pressure during part of the upstroke. When operating as a motor, the bypass state allows the fluid to be evacuated from the cylinder during the upstroke.

A partial stroke pump or motor includes a piston coupled to a rotating shaft to evacuate a fluid within a cylinder during an upstroke. A latching check valve includes an actuator piston that is displaceable within a center cavity to bypass a blocking member in a bypass state. The actuator piston is driven by a latch supply line. A spool of a rotary valve selectively couples one of the low and pilot pressure supplies to the latch supply line over different timing angle ranges of the rotating shaft. Coupling of the pilot pressure to the latch supply line causes the bypass state. When operating as a pump, the bypass state causes the pressure in the cylinder to fall below the high pressure during part of the upstroke. When operating as a motor, the bypass state allows the fluid to be evacuated from the cylinder during the upstroke.

Provided is a braking device capable of increasing boost responsiveness of wheel cylinders. The braking device includes a second chamber from which a brake fluid is discharged by a movement of a piston caused by inflow of the brake fluid flowed out from a master cylinder to a first chamber through a brake operation by a driver, and a pump configured to discharge the brake fluid into an oil passage for supplying the brake fluid flowed out from the second chamber to a wheel cylinder.

A lubricant pump for conveying lubricant from a lubricant reservoir to a pump outlet includes a pump housing with a longitudinal axis. The pump housing has a receiving opening for a pump unit, a lubricant inlet opening and a lubricant outlet opening opening into the receiving opening, a pump drive, and a pump unit with a reciprocatingly movable delivery piston. The pump unit has a suction opening, which corresponds with the lubricant outlet opening when the pump unit is inserted into the receiving opening, and an outlet opening for lubricant. A coupling mechanism for driving the at least one pump unit includes an eccentric element which is rotatable about the longitudinal axis, a drive-side coupling section connected to the eccentric element, and a pump-side coupling section. The drive-side coupling section and the pump-side coupling section can be connected to one another automatically via a resilient latching connection.

A fuel pump for an internal combustion engine is provided comprising a barrel including a central bore having a longitudinal axis, a plunger disposed partially in the central bore and movable along the longitudinal axis, a spring retainer, a first coil spring having a proximal end in contact with a first section of the barrel and a distal end in contact with the spring retainer to urge the spring retainer into engagement with a tappet assembly, an extender element coupled to the plunger, and a second coil spring having a proximal end in contact with a second section of the barrel and a distal end in contact with the extender element to urge the plunger toward the spring retainer, wherein the extender element includes a counter-bore to couple the extender element to the plunger.

A piston rod for pumping paint includes an elongated cylindrical stem and a piston rod cap connected to the cylindrical stem. The cylindrical stem is formed from metal and has an outer diameter that is uniform along most or all of a length of the cylindrical stem. The piston rod cap is cylindrical and formed from metal. The piston rod cap includes an annular top portion that has an outer diameter that is larger than the outer diameter of the cylindrical stem, an annular bottom portion that has an outer diameter that is larger than the outer diameter of the cylindrical stem, and an exterior recess located between the annular top and bottom portions. The recess has an outer diameter that is smaller than the outer diameters of the annular top and bottom portions.

The object of the present invention is to provide a fluid rotary machine in which dead spaces can be reduced as much as possible even if the machine is enlarged by arranging rotary valves directly behind cylinder chambers. The fluid rotary machine in which first and second double-headed pistons (7, 8) intersecting within a case body (1, 2) move linearly back and forth within cylinders (16) due to the hypocycloid principle along with rotation of shafts (4a, 4b) and in which intake and exhaust cycles are repeated in chambers (22), wherein cylinder heads (17) for closing the cylinder chambers (22) are each provided with rotary valves (19) which are rotated by drive transmission from the shafts (4a, 4b) and which are provided with intake holes and discharge holes (19b) alternately communicated with the cylinder chambers (22) via communication channels (20a, 20b), and the rotary valves (19) intersect longitudinal axis of the opposing pistons (7, 8) and are capable of rotating parallel with output axil lines.