Abstract: Method and arrangement for providing a device for delivering lubricant (10a, 10b) to at least one lubrication point (17) and which includes a reservoir (9) for lubricant (10a, 10b) connected to the lubrication point (17) via a valve arrangement (16). The device includes a controller of the valve arrangement (16), depending on the pressure in an hydraulic circuit (26) connected to the device. The invention provides an improved device for the efficient delivery of lubricant to a lubrication point.

Abstract: A static pressure sliding block which can exhibit a stable function for a long time while flow control member 23 is pressed onto recess surface 21b of static pressure receiving surface 21a for fixing it onto main body 21 formed of a brittle material by employing elastic deformation of connecting member 22 so that damage of main body 21 can be avoided because flow control member 23 is fixed without screw holes and only by applying compression stress.

Abstract: A hydrostatic machine with a cylinder block (6), within which sleeve holes (28b) are arranged, in which sleeves (28) sit, surrounding piston bores (28a) in which pistons (29) are mounted, such as to be displaced back and forth and the pistons (29) extend into the cylinder block (5) such as to define cylinders (26) with the front ends thereof. According to the invention, the risk of piston seizure can be reduced, whereby the sleeves (28) comprise an axially-defined recess (41) in the outer surface thereof, in the region facing away from the cylinder and the region with the greatest piston radial force, pressing the pistons (29) against the wall of the piston bore.

Abstract: In a rodless cylinder device, an inside moving unit is slidably inserted in a cylinder and an outside moving unit is slidably inserted on the cylinder, the inside and outside moving units being magnetically coupled. The inside moving unit has inner sliding guide rings on the two opposite ends with an inside magnet device disposed therebetween. A sealing ring or packing is provided between the inside magnet device and one of the inner sliding guide rings in such a manner that a grease retaining space is formed between the packing and the inner sliding guide ring. While the outside moving unit is moved together with the inside moving unit under the magnetic coupling force between the two moving units, the packing is lubricated by grease supplied from the grease retaining space, whereby the lubricating performance of the rodless cylinder is improved.

Abstract: The rotary machine of the invention includes a series of cylindrical chambers swept by pistons in hydraulic liquid admission-and-discharge cycles and alternately connected to high pressure openings and to low pressure openings during each revolution of the machine, wherein said machine it includes a pre-discharge opening disposed between the high pressure opening and the low pressure opening in that order relative to a direction of rotation of the machine, and wherein the pre-discharge opening is connected by a connecting duct to rotary support devices to cause hydraulic fluid to pass through the rotary support devices.

Abstract: A self-lubricating die cylinder assembly is provided containing a cylinder, piston, expansion reservoir and working chamber. A lubricating oil recirculation means is provided to transport oil between the working chamber and the expansion reservoir during each of the piston strokes. A flow restrictor is provided to create a pressure differential between the two chambers during movement of the piston thus creating a jet mixture of compressible working fluid and lubricating oil spraying onto the walls of the cylinder.

Abstract: A precision, very low flow rate, lubricant metering apparatus and method for metering lubricant to a tool and workpiece while various machining operations are performed by the tool on the workpiece. The apparatus has a pneumatic air logic unit which delivers a stream of air pulses to a pneumatically driven positive displacement, precision lubricant injector pump at a selectively variable rate. In response to each air pulse delivered to it, the injector pump delivers a selectively variable amount of lubricant to a lubricant delivery line by which the lubricant can be conveyed to the tool and workpiece. When the apparatus is used with a machine tool powered by an air driven motor, an air flow sensing valve is provided which automatically delivers compressed air to the air logic unit only when the air driven motor is consuming compressed air.

Abstract: For work vehicles, for example, cold weather can be a problem. Disengaging the vehicle clutch (26) aids starting by reducing engine loads during starting. Where the clutch (26) is hydraulically actuated, it can be disengaged by keeping fluid pressures below required engagement pressure when supplying other elements common to the clutch hydraulic circuit. Apparatus is provided which during starting directs fluid to, for example, pump drive bearings (20) at less than clutch engagement pressure. An input signal to the apparatus from the vehicle operator after engine start-up then builds pressure to activate the clutch (26) while continuing to supply the pump drive bearings (20) for lubrication. Upon a preselected fluid flow to the apparatus, such as at engine shutdown, the apparatus automatically returns to the condition at which available pressure levels are less than required for clutch engagement.

Abstract: Oil is supplied to the compressed air supply hose for a jack leg drill by means of a conventional in-line oiler. A substantial part of the oil is separated from the drive air by means of a wall flow separator at the drill and conveyed through internal passages in the drill to various parts to be lubricated such as a chuck and a ratchet mechanism for rotating the chuck.

Abstract: The invention relates to apparatus for supplying pressurized fluid to various controlled members (16,30,34). A problem with prior apparatus is the need for a plurality of separate apparatuses to supply the controlled members. The invention solves this problem through the use of a single valve (25) that controls the supply of pressurized fluid from a fluid source to first (34), second (16) and third (30) controlled members, in which the single valve (25) has a first relief valve segment (46) to relieve the pressure of fluid flowing from the source to the first controlled member (34), a second relief valve segment (100) to relieve the pressure of fluid relieved by the first relief valve segment (46), and a third valve segment (138) to direct the fluid relieved by the first relief valve segment (46) to the second (16) and third (30) controlled members. A movable lever (26) is connected to the third valve segment (138) to shift this valve segment (138) and control the direction of the fluid.

Abstract: A hydraulic control system having a pump and circuits connecting the pump to a pair of hydraulic motors through first and second circuits is provided with a priority valve system operative to provide a priority of fluid pressure to the first motor up to a predetermined minimum pressure and thereafter to maintain the pressure in the first circuit and simultaneously supply fluid to the second motor of the second circuit. The priority valve system is also responsive to a load on a second motor to split the flow of fluid between the two motors above the predetermined minimum pressure up to a second pressure after which the second predetermined pressure is maintained in the first circuit while fluid is being supplied to the second conduit.

Abstract: An improved lubrication system is provided for the cylinder of a reciprocatory plunger rod compressor, having a stationary annular seal assembly around said plunger rod. The key feature of this system resides in the incorporation of check valves in lubricant supply passages located internally within the seal assembly surrounding the plunger rod. Preferably, said check valves are located within suitable recesses bored into the rear face of an interior packing cup element of said seal assembly. The use of such internal lubricant check valves protects the lubricator quills, fittings, and other components of the lubrication system against fatigue failures and lengthens the continuous on-line operating life of the entire lubrication system.

Abstract: A rotary hydraulic jack having two jack compartments, comprising a rotary hydraulic joint for the supply of hydraulic liquid to and the evacuation of hydraulic liquid from at least one of the compartments. The hydraulic joint comprises a fixed, hollow cylindrical part and a rotary part supported by bearings with a narrow annular gap between itself and the fixed part. A passageway leads to said compartment and has a portion in each of the fixed and rotary parts, the passageway portion in the rotary part being equipped with at least one non-return device for hydraulic liquid supplied to said compartment. A groove is provided in at least one of the fixed and rotary parts and communicates with the passageway portions in the fixed and rotary parts. Means is provided for supplying gas under pressure to the annular gap betwen the fixed and rotary parts for the purpose of expelling residual oil from the gap after the supply of hydraulic liquid under pressure to said compartment via the passageway has been completed.

Abstract: An impact motor has a reciprocating piston that has its piston rod guided in bushings in the housing. The bushings are lubricated by oil-loaded compressed air but the piston is forced to reciprocate by oil-free compressed air.