Abstract: An engine cover is disclosed which replaces the conventional cover generally found on small internal combustion engines. The cover is preferably made of clear Lexan.TM. plastic and is designed to withstand the forces and heat generated by normal engine operation. The cover preferably includes as an integral part thereof a main bearing with heat sinking an auxiliary bearing and an oil fill port.

Abstract: An engine block includes a crankshaft, and is enclosed by a sheath. Sealing elements connect the sheath to the engine block and insulate against structure-borne sound. A flywheel is non-rotatably connected to the crankshaft at one end of the engine block. A power train housing is disposed at that end of the engine block and includes a flywheel housing which accommodates the flywheel. The flywheel housing is rigid with the engine block and forms a unit therewith. The sheath encloses the engine block on all sides and defines an oil chamber around the engine block. The sealing elements consist of rings provided at opposite ends of the engine block. The unit is carried by and connected to a support by elastic elements which insulate against structure-borne sound.

Abstract: A front cover for covering gears and a belt located in the vicinity of the front surface of an automotive engine body, the front cover being made of a soft material which is high in vibration-damping capacity and sticked on the front surface of the engine body, thereby effectively suppressing the vibration of the front cover itself though engine vibration is transmitted thereto, and completely protecting the gears and belt from foreign substances.

Abstract: An engine sump 4 has an oil suction passage 7 formed in its side wall to communicate with the sump well 6 at its lower end and to open upwards at its upper end to communicate with a passage in a crankcase 3. Preferably, the passage 7 opens into an upwardly opening gallery 13 in the top of the sump wall along part of its length. Two such oil suction pipes 7, 8 may be provided at opposite locations relative to a central point so that the sump 4 can be rotated 180 degrees about this point from one fitting position to another. A filter element 11 may be provided in the oil suction passage 7 and held therein by the crankcase 3.

Abstract: A method of regulating the engine compartment temperature by opening shutters and operating blower(s) and radiator cooling fan to provide air flow through the compartment to maintain a minimum temperature. The enclosed engine compartment provides for rapid heat up of engine and the crankcase, supplies heated inducted air into the engine and aerodynamically shapes the forward of the engine enclosure. A sloped shroud at the front of the engine compartment also enhances the cooling efficiency of the radiator.

Abstract: An aluminum rocker housing (10) is secured to the cylinder head (8) of an internal combustion engine (2) to surround and protect the cylinder valve assemblies (156, 158) and associated rocker arm mechanism. The front face (58) of the rocker housing (10) includes a recessed surface (68) which forms an air intake plenum (60) for receiving pressured air from the engine turbocharger (48). Air intake passageways (84, 86, 88) cast to the rear of the front face (58) communicate with the air intake plenum (60) and simultaneously register with air intake ports (160) formed in the cylinder head (8) to provide a means for distributing air from the air intake plenum (60) to the cylinders (16). A rocker cover (12) molded from plastic is secured to the rocker housing (10) by a plurality of vibration-damping bolt assemblies (13). The rocker cover (12) contains a drip lip (148) to prevent engine lubricants from coming into contact with the rocker cover gasket (14).

Abstract: An automotive internal combustion engine comprises a cylinder block having at its bottom section a plurality of main bearing supporting sections, a bearing beam structure secured to the cylinder block bottom section and including a plurality of main bearing caps each cooperating with a main bearing supporting section of the cylinder block, and a beam section securely connecting the main bearing caps with each other, and a support arm disposed on an end portion of the bearing beam structure and rigidly connected to the lower section of a transmission bell housing, thereby effectively suppressing the angular displacement of the cylinder block relative to the transmission bell housing.

Abstract: An internal combustion engine comprises a cylinder block including cylinder barrels, and main bearing bulkheads each having a bearing section; main bearing cap sections respectively secured to the bearing bulkheads so that each main bearing cap section and the corresponding cylinder block bearing section associate to constitute a main bearing for rotatably supporting a crankshaft; and a bearing beam structure detachably secured to the main bearing cap sections to connect the main bearing cap sections with each other as a single unit, the bearing beam structure including a plurality of beam sections which are disposed parallel with each other and extend along the row of the main bearing cap sections, the beam sections being connected with each other, thereby effectively decreasing engine noise while facilitating the handling of the engine parts before assembly.

Abstract: In order to improve in a simple manner the ventilation of a water-cooled internal combustion engine having a sound-absorbing cover, a suction device is provided at the air inlet opening of the cover, the suction device containing a suction port in the low pressure area of the radiator/fan assembly. By specific placement of several air inlet openings a variety of cooling requirements may be met.

Abstract: An internal combustion engine such as that used on a motorcycle is made burglarproof by making inoperable any one of a number of movable engine parts. Externally a key is used to lock such engine elements as the crankshaft, drive shaft, transmission components, shift components and clutch components. A locking means is also disclosed that prevents the two engine casings from being taken apart.

Abstract: An oil pan for an automobile engine comprising an upwardly open pan having first and second bottoms located at different distances from an upper edge, and an auxiliary compartment pan beneath the bottom which is closer to the upper edge and joined to it; a wall extending between the two bottoms of the pan has an aperture communicating the oil pan and the auxiliary compartment.

Abstract: An internal combustion engine comprises a cylinder block having cylinder barrels and bearing sections, and a bearing beam structure including bearing cap sections each of which associates with each cylinder block bearing section so as to rotatably support the journal of a crankshaft, first and second upper beam sections disposed along the two upper opposite portions of each bearing cap section to securely connect the bearing cap sections with each other, and first and second lower beam sections disposed along the two lower opposite portions of each bearing cap section to securely connect the bearing cap sections with each other, thereby effectively reducing engine noise particularly due to the vibration of a skirt section of the cylinder block.

Abstract: A V-type internal combustion engine has a timing gear mechanism positioned in front of the cylinder block for driving the camshaft from the crankshaft. A coolant pump is secured to the cylinder block laterally offset from the crankshaft and adjacent one bank of cylinders. A first discharge passage leads from the coolant pump to the adjacent bank of cylinders and the second discharge passage is formed on a cover for the timing gear mechanism for supplying coolant to the remote bank of cylinders.

Abstract: In a reciprocating piston internal combustion engine to be installed horizontally in a motor vehicle the cylinder block (2), the cylinder head (4), one half (8) of the crankcase and the oil sump (9) are formed from a single casting, the oil sump being positioned below the cylinder block and having an opening (13) in the same plane as a flat surface (12) on the cylinder head which locates a camshaft case (14).The camshaft case (14) and the oil sump cover (17) are formed as one unit, and a stay between the camshaft case and the oil sump cover accommodates the drive shaft (21) of an oil pump (22) located in the oil sump and driven by the camshaft. A second stay (19) between the camshaft case and the oil sump cover contains a duct (25) for conveying oil from the camshaft case back into the oil sump.

Abstract: A constrained-layer construction comprising a stiff layer or substrate and a layer of a viscoelastic polymer which is the reaction product of (a) 25 to 75 weight percent of an acryloyl or methacryloyl derivative of at least one oligomer, said oligomer having a glass transition temperature of less than 25.degree. C. and a molecular weight per oligomer of 600 to 20,000, and (b) 75 to 25 weight percent of a copolymerizable monomer whose homopolymer has a glass transition temperature of at least 50.degree. C., the copolymer being suitable for damping vibrations at relatively high temperatures, e.g., 50.degree.-150.degree. C., is disclosed. Also included is a process for damping vibrations in component parts of devices used in automotive, aerospace, and computer industries.

Abstract: A cylinder block of an internal combustion engine, comprises an integrally formed metallic main body including a cylinder section and bearing bulks and a part of a water jacket. First and second side cover members are secured respectively to the opposite side surfaces of the main body so as to maintain a fluid-tight seal therebetween, each side cover member defining thereinside a part of said water jacket and including a skirt section. The side cover members are made of a non-metallic material which is light in weight and high in damping capacity, thereby effectively damping the engine vibration transmitted to the side cover members to prevent the skirt section of the side cover members from emitting noise.

Abstract: A heat insulating mounting device for use with a carburetor of an internal combustion engine including a heat insulating casing formed of a heat insulating synthetic resinous material for enclosing the carburetor connected to a cylinder in a manner to isolate the carburetor from the heat of radiation of the engine, and a flexible air passageway of small thickness formed of a heat insulating high molecular compound of rubbery properties heat insulatingly communicating the carburetor with the cylinder.

Abstract: An internal combustion engine which includes a secondary aggregate or unit such as, for example, a vacuum pump, located inside of a valve housing which is formed by a cylinder head and a cylinder head cover. A portion of the vacuum pump, for example, a connecting portion for a vacuum line leading to a consumer, extends outwardly through an opening or passage and forms a seal with the cylinder head cover.

Abstract: An air cleaner system for an internal combustion engine located in a vehicle engine compartment. The system includes a cubic air filter device located beside the engine in the engine compartment which is arranged to draw air from outside the vehicle, pass it through a filter cartridge in the air filter device, and through a flexible conduit connecting the air filter device with the carburetor.

Abstract: An intake and exhaust system for a compact motorcycle including a valve arrangement for closing both the intake and exhaust systems so as to preclude the escape of fuel vapors to the surrounding area when the motorcycle is not in use.

Abstract: An internal combustion engine whose engine unit support, comprising such sound-generating parts as cylinders, cylinder head, piston rods, crankshaft bearings, crankshaft, is provided with a bracket of at least two arms at least at its output end. This bracket is attached to the bearing seats of the crankshaft and is provided with at least one sound-insulating element at each end of its arms for connecting said engine unit support to the crankcase. This will reduce any relative movements between the crankshaft and the crankcase in a simple manner.

Abstract: The invention provides an air cleaner assembly in combination with an engine having a blower housing with airflow circulating therethrough and a carburetor having an intake. The assembly comprises a duct having an inlet and an outlet with the inlet angularly disposed through the blower housing, an air cleaner housing having side walls and a bottom wall, and an outlet chamber having an inlet and an outlet in communication with the carburetor inlet. Within the air cleaner housing, a first interior wall is upstanding from the bottom wall and defines with certain side walls an intake chamber having an inlet communicating with the duct outlet, and a second interior wall upstanding from the bottom wall so that a filter chamber is formed between the interior walls having an outlet in its bottom wall so that the filter chamber and outlet chamber communicate through the filter chamber outlet and the outlet chamber inlet.

Abstract: An internal combustion engine includes an engine block, an oil pan, a sound insulating capsule and a sealing gasket connecting the oil pan to an underside of the engine block. The sealing gasket has folds for permitting a relative displacement between the engine block and the oil pan during operation of the engine. The sealing gasket is supported on a lower portion of the capsule as a component thereof, while the capsule is supported externally of the engine. A closure plate is sealingly secured to the engine block for covering an underside of the engine block. The plate has an oil return opening whose dimensions are small relative to length and width dimensions of the closure plate and the oil pan. The closure plate and the oil pan carry nipples which are in alignment with one another and to which the sealing gasket is secured.

Abstract: A hose joint, used in the neighborhood of a radiant heat source such as an exhaust manifold in a vehicle for example, having on one end thereof a hose attaching portion and on the other end a fixing portion, provided with a sheltering cover secured on the hose joint in the middle between the hose attaching portion and the fixing portion for being interposed between the radiant heat source and the hose so as to protect the latter from the former's heat. The sheltering cover is a metallic plate which is metal-plated for effectively reflecting the radiant heat; it is preferably disposed perpendicularly to a line linking the hose attaching portion and the radiant heat source irrespective of the shape of the hose joint, for example, straight or bent.

Abstract: An endless ridge extends along the peripheral portion of each of opposed sides of a cylinder block in a manner to enclose the major portion of the side a soundproof board is sealingly mounted to the ridge in a manner to cover at least the major portion enclosed by the ridge and to define a considerable air space (t) between the outer surface of the major portion and the inner surface of the soundproof board. The soundproof board is constructed of a material having high vibration damping effect and high thermal conductivity.

Abstract: A noise-reducing casing member for oil-containing elements of interval combustion engines. The walls of the casing member are converging stepped plates containing inward depressions and/or grooves for frequency detuning.

Abstract: A semicircular packing comprising a metallic portion and an elastic portion sealing the pierced hole of the cylinder head when setting, having thick portions at both ends of auricules and a thin portion between thick portions at both ends, at least on the metallic portion partly contacting with the outer surface of the pierced hole. This semicircular packing is easily conformed to the curved peripheral surface of the pierced hole and makes it unnecessary to coat it with sealing liquid as well as able to permit the clamping torque of the cylinder head to be small and yet maintain its sealing state over a long term of years without being subjected to excessive or premature aging.

Abstract: An engine oil pan is mounted in noise reducing vibration isolation from the associated engine by a mounting arrangement including a unitary resilient seal having lips that extend under the oil pan flange to retain the seal in assembly with the pan both during and after assembly of the pan to the engine block. Separate support members interconnect spacer sleeves that extend through gripping openings in the seal and limit compression of the seal by oil pan attaching bolts so as to maintain the vibration isolating qualities of the seal in assembly.

Abstract: An internal combustion engine including a piston and cylinder liner in which the cylinder liner is provided with plural annular hardened layers formed on the inner peripheral surface thereof in the vicinity of the top dead center of the piston. The distance between adjacent ones of the annular hardened layers is smaller than the axial length of a piston ring employed with the piston. The width of each of the hardened layers is in a range of from one-half to twice the axial length of the piston ring. The hardened layers may be formed by hardening with a laser beam. The piston ring can be provided with a hardened layer on its outer surface. The piston ring preferably has a barrel shape.

Abstract: Inversion-protection of an outboard marine engine is achieved by fitting inside the engine casing watertight boxes to enclose the water-sensitive electrical components, i.e. the engine starter solenoid and the power pack. The starter motor spindle is provided with a shaft seal and the engine exhaust is fitted with an exhaust pipe in the form of a vertical hairpin or U-tube. The engine air intake box has fitted inside it a horizontally sliding valve that is automatically closed by a vertically-sliding weighted wedge engaging the valve rod.

Abstract: A noiseless cover such as an oil pan, front cover, cylinder head cover and the like for an engine comprises elastic bodies fixed to an engine body of the engine and resiliently abutting against a mid-portion of the cover, thereby preventing surface vibrations of the cover without any troublesome operation for mounting the cover and without any sealing problem.

Abstract: Fittings with internal drain passages leading to the outside through an exterior orifice are normally used in high pressure fluid systems where fluid must be transferred through a wall and leakage on at least one side of the wall cannot be tolerated. Such fittings are used, for example, in compression ignition engines where the fuel injectors are located inside of the valve cover. Any leakage drains from the exterior orifice of the fitting down the outside of the engine. On some installations the side of the engine on which these fittings are mounted must be located out of sight of the operator and the operator is unable to observe if any leakage is occurring. The present invention overcomes this problem by providing a fitting (12) that drains into a drain passage (64) that is located within the engine wall (7, 11). The drain passage (64) in the engine wall (7, 11) is routed within the engine (4) to the most convenient drain point (80) for monitoring.

Abstract: In an internal combustion engine an engine unit support is attached to an engine housing which is extended in upward direction. The two-part crankshaft bearings are attached to the engine unit support such that their upper part is fastened to the upper part of the engine unit support by mounting screws which can be handled from above and outside of the engine housing. The assembly unit which consists of crankshaft and crankshaft main bearings is supported in the engine housing by means of sound insulating elements. The whole design thus facilitates assembly and disassembly of the engine.

Abstract: Disclosed is a reciprocating piston internal combustion engine comprises a housing device connected to a cylinder block for receiving therein a crankshaft of the engine. The housing device is formed with open chambers spaced from each other by partition walls which support the journals of the crankshaft via main bearings mounted to the partition walls. A sound-insulating panel is attached to the housing device in a manner to sealingly close the open ends of all of the open chambers thereby to permit the chambers to serve as lubricant oil reservers.

Abstract: A trough-shaped sheet metal component with a deeper and a shallower portion such as an oil pan for combustion engines, and a method of deep-drawing it. In the transition between the deeper and the shallower portion, the edge between the bottom of the shallower portion and its side walls is made with a much shorter radius than the central portion. In deep-drawing the shallower portion and the transitional area, a pressure pad is used in the transitional area, where the material is locked in between die and pressure pad, so that working only takes place by bending in the edge areas.

Abstract: An aluminum rocker housing (10) is secured to the cylinder head (8) of an internal combustion engine (2) to surround and protect the cylinder valve assemblies (156, 158) and associated rocker arm mechanism. The front face (58) of the rocker housing (10) includes a recessed surface (68) which forms an air intake plenum (60) for receiving pressured air from the engine turbocharger (48). Air intake passageways (84, 86, 88) cast to the rear of the front face (58) communicate with the air intake plenum (60) and simultaneously register with air intake ports (160) formed in the cylinder head (8) to provide a means for distributing air from the air intake plenum (60) to the cylinders (16). A rocker cover (12) molded from plastic is secured to the rocker housing (10) by a plurality of vibration-damping bolt assemblies (13). The rocker cover (12) contains a drip lip (148) to prevent engine lubricants from coming into contact with the rocker cover gasket (14).

Abstract: A hood (12) for an internal combustion engine compartment (C) has an air precleaner (10) and a muffler (11) mounted on the underside of the hood (12). The collar (26) connecting the precleaner (10) to the engine air intake (M1), and the pipe (36) from the exhaust manifold (M2) to the muffler (11) are both connected by means (26b, 37) which are releasable with the hood (12) in position, so the hood (12), precleaner (10) and muffler (11) constitute a removable module.

Abstract: In an internal combustion engine the power generating parts mainly responsible for body resonance and sound vibration such as the crankshaft (3), cylinder block and cylinder head (35) are combined in a power unit which is supported in the crankcase (4) on elastic vibration-absorbing mountings (2) with the sidewalls of the crankcase (4) extending above the crankshaft axis (3).By this arrangement the crankcase (4) is free from direct vibrations leaving other non-power transmitting engine parts mounted above the crankcase (4) which require means to suppress radiated noise.In one embodiment the induction manifold (7) and mounting parts (13, 14) thereof together with the rocker cover (20) are insulated from the cylinder head (35) by vibration-absorbing elements (8,15,16,21,26) and are so shaped and arranged that they provide a screen for noise radiated from the cylinder head (35). Thus, essential parts of the engine have the secondary function of reducing the level of noise emitted by the engine.

Abstract: A reciprocating-piston i.c. engine is supported on a supporting structure by means of mountings which are attached, not to the crankcase wall, but to the main bearing structure of the engine, by means of rigid support members which extend through flexibly-sealed apertures in the crankcase wall and are rigidly secured to the main bearing blocks. The crankcase wall is thus isolated from vibrations generated by internal moving parts of the engine, and the deformations of the crankcase by such vibrations, and hence the level of noise generated by the crankcase wall, are reduced. Where a longitudinal stiffening beam is secured to the bottom bearing blocks of the main bearing structure, some of the rigid supports of the mountings may be attached to the stiffening beam.

Abstract: An air intake assembly (12) of a vehicle (10) can be adjusted to selectively communicate ambient air to an engine for summer operation and air from the engine enclosure (16) to the engine for winter operation. Accordingly, during winter operation, and especially for tree harvesting vehicles, which harvest snow laden trees creating localized snow flurries, any snow which collects on the air intake assembly (12) cannot be drawn into the engine causing poor engine performance or engine shutdown. The air intake assembly (12) includes an intake cover (72) which is pivotal from a position covering an ambient air inlet (60) to a position covering an air inlet (71) from the engine enclosure (16).

Abstract: An internal combustion engine surrounded, at least in part, by a sound insulating casing. The casing is closed to the atmosphere with the exception of an inlet opening for receiving air for combustion in the engine. An air filter is coupled to the inlet opening for filtering the air passing through this opening into the interior of the casing.

Abstract: In an internal combustion engine comprising a crankshaft (7) and crankshaft main bearings (6), an engine unit support (1) which supports the crankshaft main bearings, and a cylinderhead (3) mounted on the engine unit support (1), which are engine parts directly affected by body resonance and sound vibration, at least one vibration absorbing and power transmitting element (15) located between the engine parts directly affected by sound vibration and the crankcase (8), a sealing element (21) located in a joint between a engine unit support (1) and the crankcase (8) which seals an encapsulated upper dry engine region oil-tightly against a lower oil-wetted engine region (22), an elastic filling element (19) bridging at least a part of the joint being inserted into the joint before the mounting of the sealing element (21) and supporting the latter, whereby the sealing element (21) comprises a viscous material forming an adhesive compound with metal which is resilient after curing.

Abstract: Spacers are used where added bolt length is advantageous. Such spacers are usually one piece and are formed from tubing having a solid cylindrical wall which often splits or yields when stressed by highly torqued bolts. An improved spacer (10) is formed from wound coil (12) to form a spiral walled cylindrical body (20) having advantageous over prior spacers. Each spiral (14) includes a portion (26) which abuts each adjacent spiral (14) and a portion (30) which is free of such abutment.

Abstract: A unitary structure for a vehicle engine which provides an air cleaning function, a fuel vapor storage function and a valve cover function. The structure may be molded or cast in a configuration particularly adapted to be secured to the outer portion of an engine cylinder head thus forming an enclosure means for valve components such as rocker arms and a camshaft if the engine is an overhead cam type engine. First and second wall means are spaced progressively outward from the cylinder head to form a space therebetween adapted to hold a quantity of activated charcoal. The charcoal is connected to the fuel tank and carburetor to trap and store fuel vapors therefrom. Another space is formed above the second wall means to house an air filter element. Air inlet and outlet means are located below and above the filter element to provide for a flow of air to the engine carburetor.

Abstract: An internal combustion engine has an oil pan divided into two chambers that communicate with each other. The first chamber is at a distance above the bottom of the oil pan, which is also the bottom of the second chamber. Because the bottom of the oil pan is cooled by the slip stream the oil in the two chambers are at different temperatures. Suction lines lead from each chamber to a thermostat valve that connects them to a discharge line. The thermostat valve operates such that when the engine is cold the oil supplied to the discharge line is relatively hot oil from the first chamber and when the engine is hot the relatively cool oil from the second chamber is supplied via the valve.

Abstract: There is provided an adaptor for use with internal combustion engines which adaptor permits utilization of an improved oil pan. The improvement includes an adaptor for use with the oil pan, an improved oil pan configuration, a flange for use with the adaptor and a clamp for holding the pan to the adaptor and flange.

Abstract: In a reciprocating internal-combustion engine, a power unit comprises cylinders 1, cylinder heads 2, pistons, connecting rods, a crankshaft and crankshaft bearings. Soundproofing supporting members mount the ends of the power unit in an outer pan 7 which is connected to a flywheel housing 8. Soundproofing supporting members 12, 12a, 13 are coaxial with the crankshaft and center the power unit and hold it against substantial axial movement in the outer pan. An oil seal 14 is fitted between the power block and the top rim of the outer pan.

Abstract: A housing for an internal combustion engine of the type used with portable chain saws having a cavity therein for a fuel supply and another cavity for lubricating oil. The engine housing is composed of at least an upper and a lower portion which are joined along a substantially horizontal dividing plane which is substantially parallel to the bottom plate of the lower portion of the engine housing. The dividing plane intersects the crankshaft casing of the engine whereby two separate closed cavities are formed for separately storing fuel and lubricating oil for said chain saw.

Abstract: A multicylinder internal combustion engine with a crankcase secured to a connection flange of the cylinder block and a flywheel at the output end of the crankshaft, the distance between the connection flange and the crankshaft axis corresponding approximately to half the diameter of the flywheel.

Abstract: An oil pan for internal combustion engines having a piston--piston rod--crankshaft assembly effecting "splash" lubrication and having a pressurized engine lubrication system. The oil pan substantially reduces unnecessary "splash" and thus increases engine efficiency. The oil pan has a main sump disposed below the bottom wall of the pan for containing oil. There is a side sump disposed in one side wall of the oil pan and in fluid flow communication with the main sump. An elongated windage tray, semi-circular in cross-section, is provided and is positioned longitudinally in the oil pan adjacent the side sump with the convex side down and is spaced above the pan bottom wall. A coacting elongated skimmer bar is positioned above and spaced from an upper edge of the tray adjacent and slightly above the side sump for channeling oil skimmed off the tray into the side sump and then into the main sump in controlled flow.