Abstract: Disclosed is lubrication for a slow-running two-stroke engine, especially marine diesel engines. The lubrication uses Swirl Injection Principle by locating the lubricant injectors closer to the TDC than ? of the full stroke of the piston, which is closer than in typical marine diesel engines. This can be achieved by reconstructing cylinder liners or by adding new mounting holes to the cylinder. In case that such reconstruction is not possible, an improvement of SIP principles can also be achieved by directing the spray towards the TDC or to a location on the cylinder liner closer to the TDC as compared to the location of the SIP valves, for example under an angle of more than 30 degrees or even more than 60 degrees when measured from a plane normal to the cylinder axis.

Abstract: A relief valve device includes: a housing including a valve chamber, an orifice, and a relief discharge port; a valve body that opens and closes the relief discharge port while moving inside the valve chamber of the housing; a relief valve including an elastic member that elastically biases the valve body in a direction in which the valve body closes the relief discharge port; and an oil control valve that controls the supply of oil into the valve chamber, wherein an inlet port for the oil supplied from the oil control valve and the orifice are configured such that oil can always circulate in the valve chamber.

Abstract: A compressor valve plate (80) for a reed valve (94) has a mounting surface portion for mounting a base portion (104) of a reed (100). The compressor has a port (90). A seat (150) surrounds the port. A trepan (154) surrounds the seat. A relieved area (180, 182) less deep than the trepan extends proximally (182) of and distally (180) of the trepan. A reciprocating piston compressor comprises a valve assembly having such a compressor valve plate and a reed.

Abstract: The present invention refers to a method for controlling a piston cooling circuit of an internal combustion engine wherein said circuit comprises at least a circulation pump and means for emitting cooling oil connected to the delivery of the pump. According to the method, said pistons are cooled by a jet generated by said emitting means only during the upward stroke of said pistons from the bottom dead center to the top dead center.

Abstract: The present invention discloses an oil supply valve assembly of a linear compressor including a shell, the oil being stored at the lower portion of the shell, a cylinder disposed in the shell, a piston disposed in the cylinder, a main body frame to which the cylinder is fixed, and a linear motor connected to the piston, for driving the piston, comprising: a passage formed in the main body frame, for supplying the oil to a gap between the cylinder and the piston; an oil valve being coupled to the main body frame to communicate with the passage, and including an oil suction valve and an oil discharge valve; and an oil cover coupled to overlap with the oil valve and communicate with the passage of the main body frame. By this configuration, the manufacturing process of the oil supply valve assembly is simplified and mis-assembly of the components is prevented by reducing the number of the components.

Abstract: A drive unit of a transmission includes, but is not limited to a main shaft. The main shaft includes, but is not limited to a bore formed along its center axis for the transport of lubricating oil. An oil transport line is provided via which a roller bearing arranged on an end section of the main shaft is at least indirectly connected to the bore.

Abstract: There is disclosed a method for cylinder lubrication of large diesel engines, such as marine engines. Injection of lubricating oil is performed via a number of injection units that correspond to a multiple of the cylinder number in the engine. There is desired an efficient distribution of the lubricating oil, not only across the periphery of the cylinder, but also across the travel of the piston in the cylinder in order thereby to reduce the consumption of lubricating oil. This is achieved in that lubricating oil is supplied by a combination of injection of a first part of the lubricating oil directly on a ring area of the cylinder wall before the passage of the piston and an injection of a second part of the lubricating oil directly onto the piston during its passage.

Abstract: Methods and apparatus for lubricating suspension seals by pumping fluid to the seals using a compression or rebound action of a suspension component.

Abstract: There is described a hydraulic lubricating apparatus (252) for dosing cylinder lubricating oil, including a housing which via one or more valves (220) is connected to a source for supplying hydraulic oil (262) and cylinder lubricating oil (not shown), a number of hydraulic cylinders each having a hydraulic piston (6) and which may be pressurized by hydraulic oil. Furthermore, there are a number of injection units (251) corresponding to a multiple of the cylinder (250) number in the engine, and which are connected with each their dosing cylinder by a dosing piston (21). Also, there is provided a distributor plate (7) which at one side is in contact with the dosing pistons (21) and which at its other side is in contact with the hydraulic pistons (6) for displacing the distributor plate for actuating the dosing pistons.

Abstract: Divider device for a flow of lubricant carried by a gas, typically air, comprising a distribution barrel (4) having an end face (5) into which run longitudinal distribution channels (6, 7) communicating with outlet orifices (8, 10) and a connection piece (18) mounted upstream of the distribution barrel (4) and comprising a hollow body with a bore (20) through which the flow of lubricant and gas can pass. The bore (20) of the connection piece (18) has a localized throttling region (26) of reduced cross section followed by a region (22) of enlarged cross section, and there is a gap defining a chamber (25) between the connection piece and the distribution barrel.

Abstract: A lubricating structure of a rotational shaft oil sealing portion includes a casing, a rotational shaft rotatably retained by the casing, an annular space defined between the casing and the rotational shaft, an annular oil seal retained by the casing at one axial end of the annular space and sealing a clearance between the casing and the rotational shaft, the annular oil seal defining an oil seal chamber at the other axial end of the annular space, an oil supply passage, an oil drain passage, and an oil groove formed at the inner peripheral wall of the casing by cutting away the inner peripheral wall into a crescent shape in a circumferential direction, the oil supply passage communicating with the oil groove at a circumferentially center portion of the oil groove, wherein pressurized lubricating oil is supplied to the oil groove via the oil supply passage.

Abstract: A linear compressor is provided. The linear compressor includes a cylinder having a refrigerant compression space inside; a piston, linearly reciprocating inside the cylinder to compress a refrigerant; a frame having the cylinder affixed at one end and a mounting groove at a lower portion; an oil feed assembly positioned in the mounting groove to supply oil; an oil supply path in a linear shape, positioned at a lower portion inside the frame to communicate with the mounting groove and with a bottom of the cylinder and which supplies oil between the cylinder and the piston; and an oil recovery path in a linear shape positioned at an upper portion inside the frame to communicate with an upper side of the frame and with a top of the cylinder and which recovers the oil between the cylinder and the piston. The oil feed assembly is in kit form.

Abstract: An oil squirter for an engine includes a piston-type valve having a damping vent configured to damp oscillations of the valve piston during opening and closing. The valve piston may be spring biased and the valve may opened by oil pressure exerted on the piston at or above a cracking pressure. The damping vent controls displacement of the valve piston by creating delta pressure in oil contained in a piston chamber in opposition to axial piston movement during opening and closing of the valve, to stabilize the axial movement of the piston thereby damping valve oscillation during valve opening and closing. The damping vent operates to increase cracking stability and eliminate cyclic contact of the valve piston and valve seat to prevent noise, wear, binding, and oil system pressure fluctuations due to squirter valve instability.

Abstract: There is disclosed a method and a hydraulic lubricating apparatus for dosing cylinder lubricating oil. The dosing system includes a supply line and a return line connected with the lubricating apparatus via each one or more valves for supplying hydraulic oil, a central hydraulic oil feed pump connected with hydraulic cylinders, each having a hydraulic piston and which may be subjected to pressure by hydraulic oil via the supply line, a number of injection units corresponding to a multiple of the cylinder number in the engine and which are connected with each their dosing cylinder with a dosing piston and a supply line for cylinder lubricating oil.

Abstract: A bearing apparatus includes: two split outer ring halves which includes outer ring raceway surfaces and are disposed within a supporting hole of the housing, respectively; and a plurality of rollers which are disposed on respective inner surfaces of the both split outer ring halves and supports a shaft. Each of the two split outer ring halves includes an oil hole penetrating the split outer ring half in a radial direction thereof and an oil groove formed on an outer diameter surface of the split outer ring half along a circumferential direction thereof to allow the oiling passage and the oil holes to communicate with each other. Each of the oil holes is disposed at a position located at an angle of within 45° from the joint surface of the split outer ring halves in an opposite direction to a rotating direction of the shaft.

Abstract: First and second oil flow passages are defined in a wall portion of a transmission casing. The first oil flow passage has an open end exposed to an interior of the casing. The second oil passage is connected to the first oil passage through a connection opening defined by the first oil passage. A separate pipe member has a predetermined end portion that is inserted into the first oil passage from the open end of the same. The predetermined end portion comprises a cylindrical portion having a fixed length; an end opening defined by an end of the cylindrical portion and exposed to the first oil passage; and an orifice opening defined by a side wall of the cylindrical portion. The orifice opening is blocked by an inner wall of the first oil passage when the connection opening takes a first position relative to the open end of the first oil passage, and exposed to the second oil passage when the connection opening takes a second position relative to the open end of the first oil passage.

Abstract: Disclosed is a drilling and/or striking hammer that includes a lubricating device having a lubricant reservoir and a volume of lubricant contained therein. The lubricating device conveys lubricant to at least one a transmission system within the hammer's housing, a percussion system, and/or a tool holder at a variable dosing or flow rate. The dosing or flow rate varies as a function of tool stress which can include use intensity and/or temperature. A flexible tube extends between the reservoir and the lubricated component(s). At lease part of the flexible tube vibrates with the lubricated components during use and modifies a viscosity of the lubricant therein, based on tool use intensity. A pressure generating device can pressurize the lubricant, helping convey the lubricant to a targeted area for lubricating movable parts.

Abstract: A lubricating oil composition comprising (a) a major amount of a base oil of lubricating viscosity and (b) a minor deposit-inhibiting effective amount of a reaction product prepared by transesterifying at least one glycerol ester and at least one non-glycerol polyol ester is provided. Methods for its use are also provided.

Abstract: A piston squirter system for an internal combustion engine includes an oil reservoir, a variable displacement pump, and, for each cylinder, a piston squirter that sprays oil onto a piston for cooling and lubricating. A gallery connects the variable displacement pump to the piston squirters. The variable displacement pump receives oil from the oil reservoir and distributes the oil through the gallery to the piston squirters at a flow rate according to pressure required. The gallery does not require a relief valve and the piston squirters do not require check valves.

Abstract: Embodiments are directed to lubricant delivery systems and methods. In one embodiment, the system comprises a lubricant feeder; a pipe comprising at least one nozzle; and at least one lubricant flow outlet extending upwardly from the nozzle. The nozzle comprises at least one flow area reducing portion along the length of the pipe near the lubricant feeder and the at least one lubricant flow outlet is configured to provide lubricant to at least one portion of a machine. In one embodiment, a method for controlling flow is provided comprising; delivering lubricant to an initial section of a lubricant delivery system; increasing the speed of the lubricant as it approaches a first outlet; allowing a portion of the lubricant to exit through the outlet; decreasing the speed of the lubricant after it passes the outlet; and allowing at least a portion of the lubricant to exit through a second outlet.

Abstract: An internal-combustion engine having a pressure lubrication system according to the dry-sump principle, particularly for an opposed-cylinder engine, having a crankcase in which an oil scavenging space is constructed in the lower part feeds the lubricating oil by way of an oil return feed pump equipped with an oil scavenging pipe to an oil storage tank. The lubricating oil situated in the oil storage tank is fed by way of a main feed pump to the consuming devices. The oil storage space forming the wet sump is also integrated in the crankcase of the internal-combustion engine.

Abstract: There is described a method and an installation for lubricating cylinder surfaces 6 in large diesel engines. The installation includes a lubricating apparatus 3 with a number of piston pumps 4 which via connecting lines 5 are connected with lubricating points 6 in the cylinder walls 7. In order to enable electronically controlled regulation of the lubricating oil portion, there is provided an electronic control unit 9 which is connected with a flow regulator 8. The flow regulator includes redirecting valves 12 which are inserted in connecting lines 5 between the lubricating apparatus 3 and the lubricating points 6.

Abstract: A chainsaw includes an internal combustion engine with a fuel-air mixture inlet and a carburettor with a fuel-air mixture outlet disposed in the direction of flow of a fuel-air mixture in front of the fuel-air mixture inlet. A fuel-air mixture channel is provided between the fuel-air mixture outlet and the fuel-air mixture inlet. A lubricant guide is provided along components to be lubricated, such that the lubricant circuit is connected particularly effectively to the fuel supply of the internal combustion engine. A removal device for fuel with a recess which receives fuel and supplies the lubricant guide is provided between the fuel-air mixture outlet and the fuel-air mixture inlet.

Abstract: A piston squirter system and method for an internal combustion engine is disclosed. The piston squirter system includes an oil reservoir, a variable displacement pump, and, for each cylinder, a piston squirter that sprays oil onto a piston for cooling and lubricating. A gallery connects the variable displacement pump to the piston squirters. The variable displacement pump receives oil from the oil reservoir and distributes the oil through the gallery to the piston squirters at a flow rate according to pressure required. The gallery does not require a relief valve and the piston squirters do not require check valves.

Abstract: An internal combustion engine including a cylinder with bore and a piston disposed to reciprocate in the bore is operated by moving the piston in the bore between top and bottom dead center positions and applying lubricant to a portion of the piston that protrudes from the bore. Lubricant is wiped from the piston as the piston travels into the bore toward its top dead center position.

Abstract: A novel device and method is provided for incorporating oil passageways in existing cylinder head assemblies of an overhead cam type engine valve train. The system provided utilizes a longitudinal preformed metal tube which contains multiple separate longitudinal passageways. In the course of the assembly of the tube in the cylinder head, a temperature differential is employed, e.g., the tube is cooled such as by cryogenic means to reduce its outer diameter and/or the cylinder head is heated and the tube is inserted into a mating opening in the cylinder head to provide a permanent interference fit.

Abstract: A check valve of a cylinder head controls an oil supply amount to the cylinder head according to oil pressure of a hydraulic pump. The check valve of the cylinder head according to the exemplary embodiment of the present invention may include: a lower cover of cylindrical shape including upper and lower surfaces, the upper surface being open and the lower surface having at least one first oil hole for receiving oil from the hydraulic pump; an upper cover coupled to the upper surface of the lower cover and having a sliding axle and at least one second oil hole; a first plate mounted in the lower cover, sliding vertically along the sliding axle, and having at least one third oil hole that is disposed eccentrically to the at least one second oil hole; and a second plate disposed between the first plate and the lower cover, sliding vertically along the sliding axle, and having at least one fourth oil hole disposed eccentrically to the first, second, and third oil holes.

Abstract: A motorcycle is provided in which a seat and a storage box are arranged so as to be vertically stacked on each other in a rear portion of a body frame, and a pivotally mounted powertrain unit is suspended from the body frame under the storage box. The powertrain unit extends in the fore-and-aft direction of the body frame, and the engine has a crank chamber and a lubricant oil chamber provided separately from each other. A lubrication-oil passage structure for the engine is provided between each of a pair of journal bearing portions of a crankcase. The crankcase has an enclosed crank chamber and a crankshaft which is freely rotatably supported by the journal bearing portions with plain bearings. The journal bearing portions are provided with protrusion bosses for resisting entry of lubricating oil into the crank chamber from outside of the crankcase.

Abstract: An engine lubrication method is provided. The four-cycle engine has a lightweight aluminum alloy engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A crankshaft is rotatably mounted in the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod. An oil pump driven by the cam gear, which mates with crank gear that is driven by crank shaft, inhales the oil from the oil reservoir to splash lubricate into the cylinder bore. The engine is provided with a cylinder head assembly defining a compact combustion chamber having a pair of overhead intake and exhaust ports and cooperating intake and exhaust valves. A lightweight, high-powered engine is thereby provided having relatively low HC and CO emissions. A circular arc wall surrounds around web of the crankshaft with a slight distance from the web.

Abstract: A hermetic electric compressor is capable of efficiently pumping up a necessary amount of lubricating oil even at low-speed rotation and has a simple constitution to provide an excellent workablity in assembling. The hermetic electric compressor includes an oil pump. The oil pump includes (i) a slanting channel formed in the lower portion of a main shaft and slanting from the lower portion to the upper portion thereof outwardly, (ii) a throttle formed at the bottom end of the main shaft and having an inlet port of diameter smaller than the section of the slanting channel at the center thereof, and (iii) a lower communicating passage for providing a communication between the bottom end of a spiral groove and the slanting channel. This constitution is capable of effectively lift the head of the lubricating oil.

Abstract: A gas spring has a cylinder body, a rod member internally slidably fitted in the cylinder body, and a gas chamber which is formed inside the cylinder body and filled with compressed gas. The seal members for sealing between the cylinder body and the rod member are disposed at both sides of the gas chamber, while ring members for partitioning the gas chamber are disposed at the end portions of the gas chamber close to the seal members, and accordingly, annular grease chambers for grease between the seal member and the ring member are formed, and it is possible to prevent grease shortage by the grease in the grease chambers.

Abstract: A lubrication system for an engine including a sump for lubricant, a main pump operable to pump lubricant to first lubrication positions within the engine, and an auxiliary lubricant pump also operable to pump lubricant to second lubrication positions within the engine and wherein the auxiliary pump is an electrically driven pump which is controlled by a system controller the output of the auxiliary pump being controlled according to engine operating conditions, the main pump in use, pumping lubricant to the first lubrication positions within the engine along a main lubricant feed line, and the auxiliary pump when operated pumping lubricant to the second lubrication positions within the engine along an auxiliary feed line, and wherein the main and auxiliary feed lines, are connected via a communication passage which includes a closeable communication valve, the communication valve when closed preventing the flow of lubricant from the auxiliary feed line to the first lubrication positions, and when open permit

Abstract: An oil supplying apparatus for an opposed type reciprocating compressor comprises oil kickers which are mounted on spring supporting plates coupled to armatures of respective reciprocating motors, or oil valves which are mounted on oil paths formed on a cylinder and coonnecting with a suction path, and thereby, oil in a casing can be supplied to a slant portion between the cylinder and pistons regardless of the installation type of the compressor. In addition, lack of oil in the compressor and friction caused by the lack of oil can be prevented in advance, and a reliability of the compressor can be improved.

Abstract: Kindly consider the abstract on the cover sheet of published PCT Application WO 02/35068 A1 (attached hereto).

Abstract: A lubrication system for an engine including a sump for lubricant, a main pump operable to pump lubricant to first lubrication positions within the engine, and an auxiliary lubricant pump also operable to pump lubricant to second lubrication positions within the engine and wherein the auxiliary pump is an electrically driven pump which is controlled by a system controller the output of the auxiliary pump being controlled according to engine operating conditions, the main pump in use, pumping lubricant to the first lubrication positions within the engine along a main lubricant feed line, and the auxiliary pump when operated pumping lubricant to the second lubrication positions within the engine along an auxiliary feed line, and wherein the main and auxiliary feed lines, are connected via a communication passage which includes a closeable communication valve, the communication valve when closed preventing the flow of lubricant from the auxiliary feed line to the first lubrication positions, and when open permit

Abstract: The present invention includes a distribution manifold for evenly distributing engine oil to the cylinders of an internal combustion engine, as well as, directing oil and purging any air accompanying the oil through the fuel system of an internal combustion engine. The manifold includes a plurality of cylinder oiling outlet housings, each having a number of cylinder oiling valves corresponding to the number of cylinders in an internal combustion engine. The distribution manifold has a centrally-located dome in fluid communication with the cylinder oiling outlet housings. Extending from the apex of the dome is a fuel system outlet housing also having an oiling valve to regulate the flow of oil to the fuel system. A notch extends along the upper interior surface of the centrally-located dome in fluid communication with the fuel system outlet housing.

Abstract: A lubrication structure for an internal combustion engine including an oil pump provided at a first end of an oil pump shaft arranged parallel to a crankshaft. Oil passageways are formed from a side surface of a pump chamber of the oil pump to another end of the oil pump shaft in parallel with the oil pump shaft. An oil filter is provided facing towards the oil passageways. A communicating passageway extending vertically from the oil passageways to the oil filter is also provided. This arrangement provides a lubrication structure for an internal combustion engine with a high degree of freedom with respect to oil filter arrangement with a simple oil passageway that is easy to manufacture, requires relatively small space for arrangement, and thus makes it possible to reduce the size of the internal combustion engine.

Abstract: For the lubrication of the cylinders in marine diesel engines, it is normal practice to supply doses of oil through non-return valves in a ring area of the cylinder in immediate connection with the passage of a piston ring. It is aimed at providing a more-or-less uniform distribution of the oil along the circumference of the cylinder. However, a considerable variation is ascertained in the wear along this area. With the invention, use is made of a high-pressure injection through atomization nozzles, so that an outspread oil mist if formed opposite the individual nozzles, which upon being influenced by the rotating scavenging air in the cylinder is made to impinge against the wall by centrifugal force, and herewith to form a substantially continuous film of oil in a ring area immediately before the passage of the piston ring. There is hereby achieved a good utilization of the lubricating oil, i.e.

Abstract: The present invention prevents the clogging of the oil supply hole in a compressor due to foreign substances, such as sludge, and avoids performance degradation caused by the leakage of the discharged refrigerant.

Abstract: A bushing device includes a spindle, a sleeve slidably engaged on the spindle, and a lubricating collar disposed on the inner peripheral portion of the sleeve for slidably engaging onto the spindle and for lubricating the sliding movement between the sleeve and the spindle. The lubricating collar may be made of nylon powder, sulfurous tungsten, and calcium fluoride, and may be directly secured onto the inner peripheral portion of the sleeve with such as a molding or heating process, without additional adhering process or without additional adhesive materials.

Abstract: In a reciprocating compressor, an adequate lubricating effect is ensured for a sliding surface between a piston and a cylinder bore, and the leakage of a refrigerant for discharge is prevented.

Abstract: The present invention includes an oiling distribution system having an oil distribution manifold for evenly distributing engine oil to the cylinders of an internal combustion engine and an adapter base for coupling to the oil distribution manifold having therein an air purging passage for purging any air accompanying the oil exiting an oil pumping system. The air purging passage discharges air to the oil distribution manifold wherein the air is transported to the fuel system of an internal combustion engine through a fuel system oiling outlet. The air purging passage has an air inlet and air outlet that are sufficient size to allow the transport of air but minimize the flow of oil through the air purging passage. The present invention also provides a method for purging air from an oiling system.

Abstract: The present invention, in one form, is an oiling system for an outboard engine and includes an oil tank and an oil pump located within the tank. A manifold is coupled to the oil pump, and the manifold includes a solenoid controlled valve. The solenoid controlled valve controls the flow of oil through the manifold. The manifold further includes a plurality of check valves in flow communication with the solenoid controlled valve. The check valves are in flow communication between the solenoid controlled valve and the engine cylinders. The oil system, in the one embodiment, further includes a pressure regulator in flow communication with, and downstream from, the manifold. An outlet of the pressure regulator in flow communication with the oil tank, and allows oil to flow from the manifold to the tank when pressure in the system exceeds a preselected pressure. The oil system also includes a fuel solenoid controlled valve coupled to receive oil from the manifold and to supply oil to the engine fuel system.

Abstract: An internal combustion engine has a positive displacement supercharger which can be used with particular advantage in an underpumping two stroke engine which is in the form of a valved diaphragm which reciprocates in a housing to deliver positive pulses of air. The internal combustion engine also has an oiling system which includes injecting oil between the piston and cylinder walls at discrete time intervals and any excess oil is removed through galleries in the piston, connecting rod and main drive shaft preferably by a vacuum exerted on the galleries. Various other innovative features include a two part exhaust valve, generation of the vacuum by a positive displacement supercharger, a two-part cylinder head, use of inserts on moving parts to increase the efficiency of an underpumping engine and a specially constructed flywheel.

Abstract: A piston-driven oil pump mechanism constructed to simplify structure and reduce parts for increased compression efficiency but drastically reduced generating of noise, the mechanism comprising: an oil pump cylinder additionally mounted at one side of a cylinder block formed with a cylinder where a piston is reciprocally driven by explosion in a combustion chamber; an oil pump piston reciprocally driven in the oil pump cylinder by a crank shaft where reciprocal motion of the piston is changed rotary motion; an oil drainage outlet so formed to communicate with an oil gallery above the oil pump cylinder; an oil suction inlet formed adjacent to the oil outlet above the oil pump cylinder for connection to an oil pan; and oil suction and oil drainage valves openably and closeably actuated by a valve train for opening the oil suction inlet when the oil pump cylinder is downwardly actuated to block the oil drainage outlet and for closing the oil suction inlet when the oil pump cylinder is upwardly actuated to open th

Abstract: The invention is directed to a reciprocating internal combustion engine including a four-stroke engine. A longitudinally movable piston drives a crankshaft via a crank drive and a connecting rod. The crankshaft is journalled in a crankcase containing a lubricating oil for the crank drive. The chamber containing the lubricating oil is formed adjacent the cylinder by barrier walls within the crankcase as an oil receptacle to hold the lubricating oil in the overhead position of the cylinder. The crankcase is configured to have a trough-like shape and holds the lubricating oil and the cylinder projects axially into the crankcase and defines the barrier wall of the oil receptacle with its cylinder jacket. In this way, adequate lubrication is guaranteed in every operating position of the engine.

Abstract: A piston pump of the roller tappet type for high-pressure fuel delivery in fuel injection systems of internal combustion engines, particularly in common rail injection systems. A drive shaft that is supported in the pump housing and has a number of cam-like projections in the circumference direction. At least one tappet that is disposed in a cylinder chamber radially with regard to the drive shaft and in its radially inner end region has a rotatable roller which is supported so that it can roll in the circumference direction against the drive shaft in the region of its projections in order to reduce the wear in the region of the roller bearing. The pump is embodied so that a lubricant supply opening that leads from the circumference of the tappet and feeds into the radially inner tappet end region supporting the roller and at least during a part of the stroke, communicates with a lubricant supply line of the housing, which line feeds into the cylinder chamber.