Abstract: For the distribution of lubricating oil, a duct is arranged in the crankcase 13 of a piston-operated internal-combustion engine and extends through several transverse walls 11, 12. The sections of the duct between two transverse walls 11, 12 are composed of an insert pipe 23 and of a socket pipe 24 which are constructed to be axially slidable and clampable with respect to one another. The free ends of the insert pipe 23 and of the socket pipe 24, in a sealed manner, extend in the bored transverse-wall passages 14, 15 of the duct. The arrangement results in a simplified tooling of the crankcase 13 in the area of the duct.

Abstract: A process and apparatus for changing the oil in an engine and/or flushing and scrub cleaning the moveable components in the engine utilizing the internal lube oil distribution system of the engine. The device includes an oil filter adapter positioned in the oil filter boss, a remote oil filter mounting boss and inlet and outlet hoses connecting the two. The device is mounted in the engine compartment. Suitable pump-out and fill lines are connected to the device and can be releasably attached to an external pump device. When the device is employed to change oil, the external pump device is connected, a brief surge of purge gas is introduced to remove spent oil remaining in the oil filter and internal lube oil passages and spent oil is removed from the oil pan through the pump-out line. A measured amount of fresh oil is then introduced through the fill line and the internal lube oil distribution system. Once accomplished, the external pump device is uncoupled.

Abstract: In a cylinder head for a DOHC internal combustion engine of the type having four valves per cylinder, a thin, flat recess is formed in the wall above an upper deck in such a way as to communicate an oil supply passage and an upper side of the upper deck. An oil return passage is provided adjacent a head bolt hole for providing communication between the recess and a lower side of a lower deck so that oil having lubricated parts and portions of the engine flows down to the upper side of the upper deck from which it is conducted to the lower side of the lower deck through the recess and the oil return passage. From the lower side of the lower deck, oil is returned to an oil pan by way of a cylinder block.

Abstract: To allow engine lubricant to quickly and smoothly flow downward along the inner wall surfaces of the chain casing formed in front of an engine having at least one camshaft, an idler sprocket, and first and second chains, the chain casing is composed of a head side chain casing fixed to a front end of the cylinder head, a rocker cover fixed to top ends of the cylinder head and the head side chain casing, and a block side chain casing fixed to a front end of the cylinder block in such a way that lubricant can flow downward on the basis of gravity along the inner wall surfaces of the chain casing.

Abstract: In an internal combustion engine having an engine block and a cylinder head, a pair of axially offset lubricating oil passsages in the block and the head respectively positioned so that there is no direct axial communication therebetween and with a gasket therebetween with openings corresponding to the pair of passages and a restricted communicating structure therebetween for limiting the flow of oil from the block to the head.

Abstract: A lubricating system has a main oil gallery provided for supplying pressurized oil, a first gallery connected with the main gallery for supplying first lubricating oil to the hydraulic valve-lash adjusters. A relief valve is provided for keeping pressure of the first lubricating oil constant. A second gallery is provided for supplying second lubricating oil to journals of the camshafts, and nozzles are provided for lubricating a camshaft and rocker arm for a valve disposed in an upper position than another valve.

Abstract: A prelubricating system for an internal combustion engine includes an oil intake dimensioned for insertion into the dipstick well of the engine. The oil intake tube is connected to an inlet side of an electric pump. An outlet side of the pump is connected to the oil pressure sender coupling aperture on the engine block for supplying oil to internal oil passages. A pressure activated switch causes actuation of the electric oil pump when the engine ignition switches is activated. When a predetermined oil pressure is achieved, the electric pump is deactuated and the engine starter motor solenoid is energized. In a second embodiment, the system includes an electric oil heater and a thermostatic control for preventing starting of the engine until a predetermined oil pressure and temperature has been reached. The oil intake tube includes a quick release coupling and a graduated scale for measuring the quantity of oil in the sump.

Abstract: An oil drain valve consisting of a drain fitting and a removable actuator. The drain fitting is substantially the size and shape of a standard oil, is axially hollowed, and is perforated in the walls thereof to form a passageway to drain oil from the oil pan. The passageway contains a spring-loaded ball valve. The drain fitting is internally threaded on its bolt end to accommodate the external threads of the actuator. A mechanically advantaged lever is positioned within the actuator such that tightening and loosening of the actuator within the drain fitting causes the opening and shutting of the ball valve. The actuator may be fitted to a hose and optional pump for disposal of the oil. A protective cap is mounted within the head end of the drain fitting when the fitting is not in use.

Abstract: The invention relates to an internal-combustion engine-braking device and comprises a throttle valve actuated by a control piston both of which are arranged in a controlled bore in a cylinder head. To ensure lubrication of the control piston in a simple way, the control bore is equipped with a connecting orifice to the oil return bore leading from the engine rocker-arm space into the crankcase.

Abstract: A separated lubrication type two-cycle internal combustion engine system having: a lubricating oil pump capable of discharging lubricating oil at a rate higher than the rate at which an internal combustion engine needs to be lubricated, the lubricating oil pump being disposed in the vicinity of one of projecting ends of a crankshaft and having an inlet communicating with a lubricating oil tank and a pair of outlets one of which communicates with the interior of the internal combustion engine and the other of which communicates with the lubricating oil tank; and a drive member disposed at the one of the projecting ends of the crankshaft to drive the lubricating oil pump by the torque of the engine.

Abstract: A motor vehicle power unit comprised of a transversely disposed in-line cylinder block inclined rearwardly. A crankshaft is contained within a dry sump crankcase positioned between the cylinder block and drives and output shaft through an intermediate gear. The output shaft and crankshaft define a plane that intersects a plane defined by the cylinder bores and crankshaft. A dry sump oil reservoir is positioned between these planes and the output shaft has a pulley that drives a plurality of engine accessories that lie forwardly of and over the cylinder block.

Abstract: A marine outboard drive unit (10) includes a two-cycle internal combustion engine (14), an oil storage tank (30) storing lubricating oil for the engine, and a fill tube (40) within the engine cowl (24) for filling the oil tank therebelow. The fill tube includes a partitioned (82) upper cup portion (66) vented (76) to the tank and closed by a tactilely hinged cap (68).

Abstract: A lubrication system for engines, comprising a main engine body with a crank chamber formed at the bottom portion thereof for storing lubricating oil therein, a rocker cover securely attached to the outside wall of the engine body so as to surround a rocker arm, thereby forming therein a rocker chamber, lubricating oil supply means for supplying the lubricating oil into the rocker chamber, lubricating oil return means for returning the lubricating oil in the rocker chamber to the crank chamber, a breather device intercommunicating between the crank chamber and a suction system, and bypass means for intercommunicating through the breather device between the crank chamber and the rocker chamber. The bypass means causes the gas under pressure in the crank chamber to flow into the rocker chamber and the lubricating oil supplied into the rocker chamber, is forcibly discharged into the crank chamber through the lubricating oil return means.

Abstract: An oil reservoir structure for an engine having an oil reservoir chamber attached to the lower end of the cylinder block of the engine. A volume body having a predetermined volume is located in the space defined between the crankshaft of the engine and the normal oil level in the oil reservoir chamber. The volume body becomes submerged upon tilting of the oil level, such as in vehicle turning, acceleration, deceleration or on inclines, to displace a volume of oil to raise the oil level and maintain the oil level above the oil strainer inlet leading to the oil pump. The volume body may be fixedly mounted or disposed on the oil level and vertically movable in response to a change in the oil level.

Abstract: In a two-cycle engine lubrication system in which a crankshaft is supported on a pair of bearings in a crankcase, the crankshaft being sealed with seals mounted outwardly of the bearings and lubricating holes being provided along transfer passages which connect the crankcase with a combustion chamber and extending into the crankshaft bore between the bearings and the seals. The lubricating holes open into the crankshaft bore close to the bearing and one or more lubricant guide grooves extend outwardly in the crankshaft bore from the lubricating holes to a seal.

Abstract: An oil absorbent bib to be suspended under an engine for preventing oil drip, the bib comprising a first layer of wire mesh for strength, a second layer of a pad that absorbs oil and oil based fuels, a third layer of a perforated neoprene and a fourth layer of neoprene sheet that holds water not abosrbed in the second layer that may flow out between third and fourth layers. In the assembly of the bib provisions are made for adding a bib extension for extra long engines or mechanical devices that drip oil.

Abstract: A V-shaped cylinder block for a V-type engine includes a main oil gallery elongating in an axial direction of a crank shaft; a subordinate oil gallery elongating in the axial direction thereof; a linkage passage interconnecting the main oil gallery to the subordinate oil gallery; a first feed passage feeding oil from the subordinate oil gallery to a predetermined crank journaling portion disposed at least on one side of the cylinder block in the axial direction thereof without passing through the main oil gallery; a second feed passage feeding a lubricating oil from the main oil gallery to the crank journaling portions other than the predetermined crank journaling portion; and a pump chamber having a rotary shaft disposed in parallel to the crank shaft.

Abstract: A diesel engine with a wobble plate for aircraft comprises cylinders of which the axis is arranged coaxially to the shaft. The pistons move into a cylinder and form a common combustion chamber. The pistons control the exhaust and intake with control times being modifiable by stepped pistons. The engins is supercharged by an exhaust gas supercharger associated with a mechanically controlled radial compressor.

Abstract: An oil relief valve for lubrication systems for internal combustion engines comprising a valve body having a hollow cylindrical shape, a valve seat provided at a bottom end of the valve body, a valve plug placed in the seat, a port bored in the seat to bring the oil relief valve into fluid communication with a lubrication line which supplies oil from an oil pump to various engine parts to be lubricated, a spring mounted on top of the valve plug and adapted to urge the plug against the seat to close the port, and slits cut in the valve body and provided to bring the valve in fluid communication with an oil pan. The spring has a free length smaller than the distance of the space defined between the valve plug and the top end of the valve body.

Abstract: This storage funnel is designed to retain oil or a gasoline mixture for dispensing into an engine or tank, and is also employed to store parts, etc. Primarily, it consists of a housing that serves as a reservoir for the oil or fuel mixture which will be dispensed by the operator through the employment of a rotatable valve in the housing. The funnel housing also includes a cover over the oil or fuel mixture that is pivotal, and a filler neck is included in the cover for filling the reservoir, a cap being provided on the filler neck for closure and which is opened to serve as a vent when the oil or fuel mixture is being dispensed. A second outer cover is also provided to cover articles stored on top of the other cover.

Abstract: A device (1) for use in conjunction with an engine (25) is adapted to contain a predetermined level (A) of a liquid such as oil therein. A fill passage (4) is provided for adding liquid to the device and a drain passage (7) is provided for draining liquid from the device when the liquid is above the predetermined level. A movable valve (12) is provided for opening and closing the fill passage and the drain passage. The valve is automatically positioned so as to close both passages in response to start up of the engine whereby liquid will not be lost through the passage during operation of the engine. When the engine is not operating, the fill passage and drain passage are automatically opened in response to the application of pressure filling pressure to the fill passage as a result of an axial vent hole (31) which communicates the filling pressure to an end (32) the movable valve.

Abstract: An oiling apparatus for an internal combustion engine serviced for pre-oiling the engine before the engine is started. The apparatus includes a manually operated positive displacement oil pump with an inlet at one end and an outlet at the other. An oil suction line connects the pump inlet to the oil sump of the engine, while an oil feed line connects the pump outlet to an oil gallery of the engine through the fitting usually provided for a pressure light or gage sender unit. An oil pressure switch in the feedline is normally open and closes when the oil pressure in the feedline is greater than that necessary to pre-oil the engine. The ignition switch of the engine is connected in series with the oil pressure switch between the battery and the starter motor relay so that the starter motor is disabled until the oil pressure in the feedline is sufficient to close the oil pressure switch.

Abstract: The invention relates to a prelubrication system for an engine. It is desirable to prelubricate relatively large engines to prevent possible damage of certain components such as the crankshaft and camshaft bearings. Engines that must be started in a matter of seconds are provided with prelube pumps that run continually. During long periods of continuous prelube lubrication fluid being pumped upward into the upper rocker arm area may find its way into combustion chambers and result in damage of engine components. The present system provides a fluid level control device that prevents lubrication fluid from reaching the upper rocker arm area of the engine when the engine is not running and disables the control device when the engine is running allowing the supply of lubricant to reach the upper rocker arm area.

Abstract: A rotor type oil pump is arranged about a leading end of a crankshaft having an annular external gear of the pump concentrically disposed about the leading end. An oil pump driving mechanism is proposed, which comprises a cylindrical portion integrally defined by the leading end of the crankshaft, the cylindrical portion having the same diameter throughout the axial length thereof; and a tubular spacer member coaxially disposed on and splined to the cylindrical portion to rotate therewith, the tubular spacer member having such an external shape as to be latchingly engageable with the annular input member of the oil pump.

Abstract: The invention relates to the construction of a lubricating oil channel (12), by way of which lubricating oil is conducted to spray nozzles (2) for the cooling of the pistons of an internal combustion engine. The spray nozzles (2) are connected with spray nozzle holders (3) that are secured at cross walls (4) in the crankcase (5). Passages (7) formed-in into the spray nozzle holders (3) which adjoin through-bores (9) in the cross walls (4). Plug-in pipes (10) are arranged between the passages (7) of two mutually oppositely disposed spray nozzle holders (3) secured at different cross walls (4) which complete the lubricating oil channel. A simple and cost-favorably representable lubricating oil channel is indicated therewith. A particular advantage is that the components of the lubricating oil channel are finish-machined prior to the installation and thus contaminations by machining residues are controllable prior to the installation.

Abstract: Method and apparatus for changing oil in an internal combustion engine pierces an outer wall of an old oil filter containing old motor oil to form an opening in a lower portion of the filter wall. Old motor oil is drawn from the pierced oil filter into a container by suction through the filter wall opening and a suction conduit. The oil drain plug from a crankcase containing old motor oil is removed to form a drain opening in the crankcase, and old motor oil is drawn from the crankcase into a container by suction through the drain opening and a suction cup, to empty the crankcase of old motor oil. The drain opening is closed after emptying the crankcase of old motor oil by securing the drain plug in the drain opening. The pierced and drained old oil filter is replaced with a new filter and the drained crankcase is refilled with fresh motor oil.

Abstract: A lubricating arrangement attached end face at the engine housing of a reciprocating piston engine is surrounded by an oil pump housing which is composed of two housing parts cast of magnesium. The oil pumps are preassemblable in the oil pump housing. The couplings of the oil pumps and the lubricating connections are so constructed that the oil pump housing is easily assemblable at the engine housing as a structural unit.

Abstract: An oil flow restrictor system (100) is provided for increasing the oil pressure to the main bearings of a V-block engine internal combustion engine (10) while simultaneously restricting the flow of oil independently to the left lifter oil gallery (18) and the right lifter oil gallery (16), both of which supply oil to the upper portions of their respective sides of engine (10). Oil restrictor system (100) includes a tubular body (110) having an inlet chamber (140). Oil flow is provided from inlet chamber (140) to axial outlet (154) through oil restricting orifice (130). Simultaneously oil flow is provided to the transverse outlet, provided by annular slot (116) through transverse flow restricting orifice (119), formed in annular wall (111) of tubular body )110). Each of the orifices (119 and 130) may have substantially equal cross-sectional flow areas so as to equally restrict oil flow to the left and right upper portions of engine (10).

Abstract: A venting arrangement with integrated oil separator is arranged at a crankcase of an internal combustionengine with preferably V-shaped cylinder rows and includes a housing with the oil separator. The housing is formed for reasons of structural simplification by an upper part and by a lower part which have both pot-shaped configurationand upright, mutually overlapping boundary walls and form a unit. The boundary walls of the upper part are supported at the crankcase by means of flanges which assures a simple installation of the venting arrangement.

Abstract: An oil pump cover is provided which converts a standard Volkswagen type air-cooled engine into a full flow oil system for the installation of auxiliary oil filters and coolers by merely replacing the standard oil pump cover with the cover of the present invention. The cover includes a baffle for segregating a discharge chamber of the oil pump into a first (outlet) compartment and a second (return inlet) compartment. The cover includes an outlet recess for communicating with the first compartment and has an outlet passage extending from the outlet recess to the exterior of the cover, forming an outlet. The cover further includes an oil return inlet recess for communicating with the second compartment and has a passage extending from the inlet recess to the exterior of the cover forming a return inlet. The auxiliary oil filter or cooler is installed at a remote location on a vehicle and is connected by suitable hoses to the inlet and outlet of the oil pump cover.

Abstract: A filter unit including a housing element having a first and a second inlet for fluid and a first and a second outlet for fluid, flow passages defined in the housing defining a first path of flow for fluid between the first inlet and the first outlet of the housing, a flow passage defined in said housing defining a second path of flow for fluid between the second inlet and the second outlet of the housing, and a filter member in housing being capable of filtration to remove particles of dimensions greater than 5 micrometers, the second path of flow including a path through the filter and a by-pass about the filter having a resistance to flow of fluid no greater than that of the filter whereby in normal use a proportion only of fluid passing through the second flow path passes through the filter, provides fine filtration for an internal combustion engine and is attachable to a conventional engine filter mount.

Abstract: A wrist pin lubricating system for a multi-cylinder two-cycle engine comprises a passage system for collecting and distributing crankcase condensate to the piston wrist pin bearings. A slot in each piston skirt provides continuous communication between each wrist pin bearing and a passage in the cylinder wall delivering condensate from the engine crankcases. The condensate is collected at the low point of each crankcase and is pumped to the wrist pin bearings by the pressure differential between two crankcases. Check valves are provided in the passages to maintain a directional flow of the condensate.

Abstract: An oil pump for an internal combustion engine includes an annular boss on a front cover of the engine, a counterbore in the front cover behind the boss, crankshaft driven oil pump elements in the counterbore, and a planar closure plate attached to the front cover over the counterbore and capturing the pump elements. The closure plate has a pair of raised protuberances thereon which span the chain drive chamber of the engine behind the front cover and which straddle the chain within the chamber, each of the protuberances having a flat wall around respective ones of a pair of ports in the closure plate. One of the ports is connected to the pump intake and the other is connected to the pump discharge. A pair of face seal assemblies on the cylinder block of the engine around low and high pressure galleries engage the flat walls of the protuberances when the front cover is installed on the cylinder block and define fluid seals around the ports.

Abstract: Components in or for self-powered vehicles, including in particular an integrated power unit in which a reciprocating-piston internal combustion engine and a transmission system are formed as a compact, single structural item in which the engine cylinders and the principal rotary members of the transmission are all located to one side of a plane which lies normal to the cylinder axes and includes the engine crankshaft axis. Compactness and simplicity are further promoted by designing the casing structure of the power unit to include an indivisible main component which encases parts of both the engine and the transmission system. The invention also includes features combined with and/or related to such a power unit, including a specific design for the transmission system, an arrangement of the induction system for the engine, installation arrangements for the power unit within vehicles, and related vehicle suspension systems.

Abstract: Wear is minimized in a reciprocating internal combustion engine operated by fuel with abrasive particles, such as coal based fuel. A flexible diaphragm is used to equalize pressure in a ring pack area having lubricating film with the combustion chamber pressure. This equalization of pressure minimizes the pressure differential which might occur across an oil scraper ring separating the combustion chamber from the ring pack area. This minimizing of the pressure differential prevents or minimizes the passage of abrasive particles behind the oil scraper ring. A second ring, further from the combustion chamber end of the piston than is the oil scraper ring, serves as a high pressure sealing ring and separates the ring pack area from an oil blowby chamber. The second ring provides a predetermined amount of blowby from the ring pack area into the blowby chamber, which is also bounded by a third ring.

Abstract: Components in or for self-powered vehicles, including in particular an integrated power unit in which a reciprocating-piston internal combustion engine and a item in which the engine cylinders and the principal rotary plane which lies normal to the cylinder axes and includes the engine crankshaft axis. Compactness and simplicity are further promoted by designing the casing structure of the power unit to include an indivisible main component which encases parts of both the engine and the transmission system. The invention also includes features combined with and/or related to such a power unit, including a specific design for the transmission system, an arrangement of the induction system for the engine, installation arrangements for the power unit within vehicles, and related vehicle suspension systems.

Abstract: A cover is secured to a crankcase of an engine to form a part of the crankcase. The crankshaft is supported by bearings provided in the cover and the crankcase. An oil passage is provided in the crankcase and cover and extending from an opening at a bottom of the crankcase to an inlet of an oil pump. Further, oil passages are provided in the cover and crankshaft extending from an outlet of oil pump to openings which open to the bearings for the crankshaft.

Abstract: A marine drive (2) having a lower gearcase (4) with a torpedo housing (10) having an internal lubricant-containing cavity (26) has a removable drain plug (50) and drain plug hole (52) at a location away from the exterior hydrodynamic surface (46) of the torpedo housing along which water flows, to prevent cavitation burns on the torpedo housing and the propeller (24), and to aid in eliminating propeller ventilation.

Abstract: An arrangement for the control of the oil feed into a control chamber of a piston with variable compression height for internal-combustion engines comprises a control valve in the longitudinal bore of a connecting rod that is provided with a flow-through bore for the oil supply of the control chamber in the operation of the internal-combustion engine. This flow-through bore is closed as a function of the inertial forces acting in the oil feed. In order to avoid a ceasing of the oil column in the longitudinal bore, the control valve has an additional control bore that is opened only in the starting phase and via which an additional amount of oil is guided from the lubricating oil circuit of the internal-combustion engine into the control chamber, which accelerates the upward control of the piston.

Abstract: The invention relates to a piston with variable compression height, particularly for internal-combustion engines, that consists of an interior piston part to which a connecting rod is coupled, and an exterior piston part that is slidably held at said interior piston part. In this case, the exterior piston, via two control chambers that are supplied with oil from the lubricating oil circuit, supports itself by adherence at the interior piston part, said control chambers being connected by a hydraulic system.

Abstract: An assembly for locking together in sliding relationship a yoke with a sliding block with one of the walls of a crankcase and having a channel apparatus isolated from the crankcase volume throughout rotation of the crankshaft for transmitting lubricant from an aperture in one of the walls of the crankcase via the yoke to lubricate the sliding block and crankthrow.

Abstract: A method for manufacturing a piston of an internal combustion engine, especially for forming a piston gallery portion provided in the piston head for cooling the engine. A gallery member made of a metal pipe having a high thermal conductivity or a salt-core having a shape corresponding to the piston gallery is fixed to a fixing member having a peripheral rim and a plurality of fixing legs extended from the rim. The gallery member or the salt-core fixed to the fixing member is cast in the piston, body, and then, the fixing member is cut off from the piston body. The salt-core is melted away by pouring water. By this method, a piston of light weight and having high cooling efficiency can be manufactured.

Abstract: Method and apparatus for changing oil in an internal combustion engine pierces an outer wall of an old oil filter containing old motor oil to form an opening in a lower portion of the filter wall. Old motor oil is drawn from the pierced oil filter into a container by suction through the filter wall opening and a suction conduit. The oil drain plug from a crankcase containing old motor oil is removed to form a drain opening in the crankcase, and old motor oil is drawn from the crankcase into a container by suction through the drain opening and a suction cup, to empty the crankcase of old motor oil. The drain opening is closed after emptying the crankcase of old motor oil by securing the drain plug in the drain opening. The pierced and drained old oil filter is replaced with a new filter and the drained crankcase is refilled with fresh motor oil.

Abstract: An engine lubricating system includes a lubricating oil supply mechanism having a plunger member adapted to be reciprocated in the axial direction in response to an engine output shaft to discharge lubricating oil, a control pin which is adapted to abut against the plunger member and is movable to change the stroke of the plunger member, thereby changing the discharge rate of the plunger member, and an electric actuator which moves the control pin to change the stroke of the plunger member. The engine operating condition is detected by way of at least both the engine load and the engine speed, and an electrical control unit outputs an electric control signal for controlling the electric actuator to change the discharge rate according to the engine operating condition.

Abstract: An engine block comprises a top part of the crankcase that is reinforced by a separate bottom part of the crankcase with an oil pan arranged at an exterior case wall of the bottom part of the crankcase configured so that the lubricating oil to be returned from the upper case area into the oil pan is not taken along by rotating engine components because, the bottom part of the crankcase has a lubricating-oil passage that is arranged in a fastening flange and leads out between the exterior case wall and an interior case wall, wherein the interior case wall, as a semicylindrical shell and, is arranged so that it extends close to the contour of the connecting-rod "violin" arrangement and forms a reinforcing connection to an additional opposite fastening flange of the bottom part of the crankcase and wherein the shell that separates the crank space from a space above the oil pan additional passages that are preferably arranged tangentially with respect to the shell for the discharge of lubricating oil coming out o

Abstract: A structure of internal combustion engine comprises a cylinder member composed of a cylinder which accomodates a piston connected with a crankshaft, a crankcase provided to accomodate said crankshaft, a rocker case provided to accomodate a valve actuating mechanism, an oil return passage constituting means for leading oil in said rocker case into said crankcase, and a restraining means for restraining an air flow within said crankcase from entering into said oil return passage constituting means. By the effect of the restraining means provided in relation to the oil return passage constituting means, the air flow generated by the rotation of the crankshaft does not work as a dynamic pressure of hingering the flowingdown of oil.

Abstract: A vertical shaft internal combustion engine particularly adapted for powering a rotary type lawn mower. The engine is provided with a baffled crankcase so as to minimize the adverse effects of oil "sloshing" within the crankcase while, at the same time, permitting flow between the baffles. In addition, an oil slinger arrangement is incorporated that is also baffled so as to reduce frothing in the crankcase to reduce aeration of the oil in the crankcase and also to direct the oil flow from the slinger.

Abstract: The invention relates to the arrangement of a balancing device in a casing, for a reciprocating piston engine, which permits the evacuation of the lubricating oil. The device comprises two balancing shafts (7, 8) disposed in a main part (19) of the casing (11) and each fastened to one or two intermeshing pinions (21, 22) situated in an auxiliary part of the casing. A bottom oil passage (25a) provided between the two parts of the casing enables the pinions, acting as a draining pump, to fully drain the casing.

Abstract: In an engine lubricating system in which a measured amount of lubricating oil is supplied to the combustion chamber of an engine by a metering oil pump so that a larger amount of lubricating oil is supplied to the combustion chamber when the engine load is heavy than when the engine load is light. The amount of the lubricating oil to be supplied to the combustion chamber per unit engine revolution is corrected to be larger at high engine speed than at low engine speed.

Abstract: Disclosed herein is an automatically forced fluid supply system for lubricating a crankpin in an internal combustion engine of the type wherein lubricant is suspended in a gaseous medium within the engine, the automatically forced fluid supply system comprising a crankpin including an end, an exterior bearing surface, and an interior passageway extending from the end and opening through the bearing surface, and a scoop, adjacent the crankpin end and communicating with the passageway, for intercepting lubricant in response to movement of the crankpin through the gaseous medium having therein the suspended lubricant and for conveying the intercepted lubricant to the interior passageway for distribution onto the bearing surface.