Abstract: A reinforcing structure is integrally formed on a front wall of a cylinder block of shallow water jacket type. The reinforcing structure comprises mutually crossing vertical and lateral ribs. The vertical rib extends vertically between upper and lower deck portions of the cylinder block, and the lateral rib is constructed to constitute a raised ridge of a front one of jacket bottom wall. Alternatively, the reinforcing structure comprises a raised bolt boss that is integrally formed on a front one of jacket bottom walls to catch a connecting bolt used for securing a middle portion of a front cover to the front wall.

Abstract: To simplify the connection of a cylinder barrel and a cylinder head to, a crankcase and to reduce the weight of an engine. A liquid-cooled engine is provided with the crankcase wherein a cylinder barrel having a water jacket on the cylinder side for cooling is connected to the crankcase. A cylinder head is connected to the cylinder barrel. A plurality of mounting bosses extend from fitting planes to a crankcase of the cylinder barrels and to cylinder heads that are integrated with cylinder blocks. The cylinder barrels and the cylinder heads are integrated in a state in which the mounting bosses encircle the cylinder bores and the cylinder blocks are fastened to the crankcase by bolts inserted into each mounting boss.

Abstract: In a water-cooled multi-cylinder vertical engine for an outboard engine system, cooling water having passed through an exhaust-manifold cooling water jacket for cooling an exhaust passage within an engine room is supplied to a cylinder-block cooling water jacket provided in a cylinder block through water supply pipes, a branching member and two upper and lower couplings. In this case, the lower coupling is locked below the center of a lowermost cylinder to minimize unevenness in flow rate of the cooling water flowing through a water jacket on opposite left and right sides of a cylinder toward a cooling water outlet provided at an upper portion thereof, thereby making uniform the distribution of the temperature around a combustion chamber, leading to an enhancement in cooling effect.

Abstract: A water-cooled vertical engine includes a cylinder block cooling water jacket formed in a cylinder block and a cylinder head cooling water jacket formed in a cylinder head, the jackets being substantially independent. Cooling water from a cooling water pump is supplied to the cylinder block cooling water jacket via through holes, and cooling water branching just before the cylinder block cooling water jacket is supplied to the cylinder head cooling water jacket via a pair of cooling water passages through gasket faces of the cylinder block and the cylinder head.

Abstract: A multi-cylinder engine comprises a cylinder block (1) provided with a side water passage (3) oriented in a front and rear direction and passing by each of cylinder walls 12 so as to introduce cooling water from a radiator into a cylinder jacket 4 laterally through the side water passage (3). The side water passage (3) has front and rear end portions provided with front and rear openings (3a), (3b) which communicate the side water passage (3) with a water pump (10). Thus even if the water pump (10) is arranged at either of the front and rear end portions, the opening of the side water passage 3 near the end portion where the water pump (10) is arranged can communicate the side water passage (3) with the water pump (10). And a method for alternatively producing multi-cylinder engines, uses the cylinder block (1) as a common part.

Abstract: A cylinder block for constituting an engine such as a diesel engine, comprises a cylinder portion (31) housing a piston (33); a curved skirt portion (32) covering a crankshaft (25); and ribs (61,62) formed on the inside of the skirt portion (32).

Abstract: A water cooling device of a vertical multi-cylinder engine includes a cylinder block (1) one side wall of which is provided with a side water passage (3) running along a longitudinal direction of the cylinder block (1). The cylinder block (1) has an interior area provided with a cylinder jacket (4). Cooling water from a radiator is introduced into the cylinder jacket (4) through the side water passage (3). The side water passage (3) has an outlet (5) toward a lower portion of the cylinder jacket (4).

Abstract: A cylinder block has a number of cylinder bores and a water jacket at least partially surrounding the bores. When casting a cylinder block the water jacket is formed by a slender wall of a sand core. To enable the wall to be removed from the core box the wall must taper over its entire height. Prior art water jackets therefore taper from a minimum sand core wall width at the base to a large width at the top. The cylinder block of the invention has a water jacket which, when viewed in transverse section, is wider in an intermediate portion than at either its top or base. In providing a water jacket which is narrower at the top, there is more room for the addition of machined features on the top deck. Furthermore, a water jacket which is narrower at the base can have a greater depth than conventional water jackets.

Abstract: The invention relates to a cylinder block of the closed-deck type, which can be produced by die-casting. The cylinder block includes a water jacket surrounding the cylinders adapted to be open to the side. The lateral opening can be closed by a cover, which is additionally shaped on its inside in such a way as to promote flow distribution or heat dissipation.

Abstract: A cooling system for an internal combustion engine of a marine propulsion system is provided with a poppet that is overmolded with a resilient sealing material to enhance its sealing capacity. As a result, the pressure within the internal combustion engine cooling passages can be maintained more accurately. Because undesirable leakage past the poppet is more successfully prevented by the overmolded poppet, the cooling system can more accurately regulate the temperature of the engine.

Abstract: A cavity is provided at a bend in a cooling passage near a bore bridge region between cylinders of an internal combustion engine. The cavity can be provided with a downstream protuberance which induces a portion of the stream of coolant within the cooling passage to join a vortical flow of coolant within the cavity. An upstream protuberance can be provided to align a portion of the vortical flow within the cavity with the stream of coolant within the cooling passage in order to facilitate the return of the vortical flow back into the stream of coolant within the cooling passage.

Abstract: A water jacket structure for a cylinder head and cylinder block of an automobile engine with a split cooling system adapted therein is disclosed, in which the shape of the inlet of the water jacket is altered to diminish the flow loss, and the position of the outlets for the cylinder head and the cylinder block is disposed at the same height to improve the life expectancy of the thermostat device. Water jackets are formed for the cylinder head and the cylinder block respectively and independently. An inlet is shared between the cylinder head and the cylinder block, with its cross sectional area being reduced inward, and two outlets are formed on the cylinder head respectively and independently.

Abstract: A multi-cylinder engine comprises a cylinder block (1) provided with a side water passage (3) oriented in a front and rear direction and passing by each of cylinder walls 12 so as to introduce cooling water from a radiator into a cylinder jacket 4 laterally through the side water passage (3). The side water passage (3) has front and rear end portions provided with front and rear openings (3a), (3b) which communicate the side water passage (3) with a water pump (10). Thus even if the water pump (10) is arranged at either of the front and rear end portions, the opening of the side water passage 3 near the end portion where the water pump (10) is arranged can communicate the side water passage (3) with the water pump (10).

Abstract: This invention relates to a cylinder head (1) for a multi-cylinder liquid-cooled internal combustion engine, with a cooling chamber configuration (3) adjacent to a fire deck, which is divided by an intermediate deck (4) essentially parallel to the fire deck (2) into a lower cooling chamber (5) next to the fire deck, and an upper cooling chamber (7) adjoining the lower one in the direction of the cylinder axis (6), where lower and upper cooling chamber (5,7) communicate with each other via at least one first transfer opening (9), and where at least one first transfer opening (9) is provided in the area of an opening (20) receiving a preferably centrally disposed fuel injection device (11), and where at least one coolant inlet (13) per cylinder (A,B,C), which is preferably located in the fire deck (2), opens into the lower cooling chamber (5), and at least one coolant outlet (32) departs from the upper cooling chamber (7), and where a lower cooling chamber (5) is associated with each cylinder (A,B,C) and the lo

Abstract: In an engine of a cylinder-head first cooling type, cooling performance for a cylinder head and a cylinder block is enhanced. Cooling water from a water pump is supplied via a water jacket in a cylinder head to a water jacket in a cylinder block. The water jacket in the cylinder head is defined to extend along opposite sides of a plurality of cylinders disposed in a row, and has a cooling-water inlet and a cooling-water outlet provided at lengthwise one end thereof and the lengthwise other end thereof, respectively. The water jacket in the cylinder block is defined to surround outer peripheries of the plurality of cylinders disposed in the row, and is shielded at one point by a shield member, and has a cooling-water inlet provided on one side of the shield member to communicate with the cooling-water outlet in the water jacket.

Abstract: A cylinder block has a number of cylinder bores and a water jacket at least partially surrounding the bores. When casting a cylinder block the water jacket is formed by a slender wall of a sand core. To enable the wall to be removed from the core box the wall must taper over its entire height. Prior art water jackets therefore taper from a minimum sand core wall width at the base to a large width at the top. The cylinder block of the invention has a water jacket which, when viewed in transverse section, is wider in an intermediate portion than at either its top or base. In providing a water jacket which is narrower at the top, there is more room for the addition of machined features on the top deck. Furthermore, a water jacket which is narrower at the base can have a greater depth than conventional water jackets.

Abstract: In a fluid passage structure of an internal combustion engine wherein oil flows from an in-block flow passage formed in a cylinder block to an in-head flow passage formed in a cylinder head, a groove that is generally rectangular in cross section is so formed in a top face of the cylinder block as to extend from a position corresponding to an opening of the in-block flow passage formed in the top face to a position corresponding to an opening of the in-head flow passage formed in a bottom face of the cylinder head, by machining or the like. Thus, a flow passage arrangement in which the openings of the flow passages are offset from each other is allowed. As a result, the degree of freedom in designing the fluid passage structure is enhanced.

Abstract: A cylinder block for constituting an engine such as a diesel engine, comprises a cylinder portion (31) housing a piston (33); a curved skirt portion (32) covering a crankshaft (25); and ribs (61,62) formed on the inside of the skirt portion (32).

Abstract: A water jacket structure for a cylinder head and cylinder block of an automobile engine with a split cooling system adapted therein is disclosed, in which the shape of the inlet of the water jacket is altered to diminish the flow loss, and the position of the outlets for the cylinder head and the cylinder block is disposed at the same height to improve the life expectancy of the thermostat device. Water jackets are formed for the cylinder head and the cylinder block respectively and independently. An inlet is shared between the cylinder head and the cylinder block, with its cross sectional area being reduced inward, and two outlets are formed on the cylinder head respectively and independently.

Abstract: A cylinder block and crankcase for a liquid-cooled internal-combustion engine is to be constructed by composite casting, a magnesium case being cast around an aluminum power unit block. The cylinder block and crankcase is conceived such that the aluminum power unit block is significantly used for the distribution of force between the cylinder head and the crankshaft bearing caps as well as for the guiding of the cooling water, in which case, the magnesium case is free of a cooling water guidance and predominantly used for the guiding of lubricating oil and, in addition, is correspondingly designed for the proportional stiffening against bending and torsion loads.

Abstract: The present invention, in one aspect, is a cooling system for a marine engine and includes cylinder cooling jackets, cylinder head cooling jackets, and thermostatic and pressure controls which facilitate safely operating the engine with low water flow rates. In one specific embodiment, the cooling system is employed in a marine engine including a V-type cylinder block with two cylinder banks and a valley between the banks. Each cylinder bank includes a plurality of cylinder bores (e.g., each cylinder bank includes three cylinder bores in a six cylinder engine), and respective exhaust ducts extend from and are in flow communication with each cylinder bore. Respective coolant flow paths extend from the valley to a section of each cylinder bore water jacket adjacent each cylinder exhaust duct. Specifically, water is provided from the valley to adjacent each exhaust duct in the cylinder banks. Each cylinder bore water jacket includes an outlet at an upper portion of each said cylinder bank.

Abstract: A cooling apparatus of an internal combustion engine includes an insert that is deformable, and a surface of the insert opposing a cylinder bore wall is close to the cylinder bore wall after the insert is inserted into a water jacket. A cooling apparatus of an internal combustion engine includes a cylinder block having a water jacket in which an insert is disposed; the cylinder block is machined so that a water hole or an aperture having a size corresponding to a size of the insert is formed in the cylinder block and the insert can be inserted into the water jacket through the water hole or the aperture.

Abstract: In a water-cooled outboard marine engine, a heat transfer portion is provided in an exit passage located between an outlet end of a cylinder water jacket and a cooling water outlet passage at a position upstream of the thermostat valve. Thus, when the thermostat valve has opened and the cooling water expelled from the water jacket via the thermostat valve has been replaced by freshly introduced cooling water, the heat transfer portion having a certain heat capacity warms the freshly introduced cooling water so that the rapid change in the cooling water temperature at the thermostat valve and the resulting hunting of the thermostat valve can be avoided.

Abstract: A cooling circuit arrangement for a multicylinder internal combustion engine with V-shaped cylinder banks and cooling jackets which surround the cylinder banks and which are provided with cooling liquid by a pump arranged between the two cylinder banks on one of their face sides is disclosed. The pressure-sided connection of the coolant pump, arranged on the one face side of the two cylinder banks, is connected by a coolant pipe to a distributor pipe, arranged on the other face side of the cylinder banks, for the purpose of feeding cooling liquid. A return flow chamber for the coolant from the cooling jackets is arranged between the two cylinder banks adjacent to the pump housing. In this manner the space, existing between the two cylinder banks, is utilized for a part of the coolant arrangement so that the internal combustion engine exhibits a compact design.

Abstract: In a cooling structure of a cylinder block, a cooling medium is supplied into the cylinder block in which a water jacket continuously extends around a bore wall, so as to uniform the bore wall temperature. The cooling structure sets a cooling characteristic of the water jacket based on at least one of variation in the bore wall temperature in a direction perpendicular to the axis of the borehole and variation in the temperature of the cooling medium flowing around the bore wall. The structure improves the cylinder bore cooling efficiency or the cooling uniformity.

Abstract: The present invention relates to such a water cooling device of a vertical multi-cylinder engine as mentioned below.

Abstract: An improved sealing arrangement 40 is provided for a replaceable cylinder liner 10. The sealing arrangement 40 includes a seal 26 in the form of a band that is positioned in an annular groove 28 under a flange seat 20 of the cylinder liner 10. The annular groove 28 includes a first and a second undercut 30,34 that provides a relief area for the seal 26 to deflect into lessening the opportunity of damage to the seal 26. The first and second undercuts 30,34 also relieve stress in the axial direction improving the fatigue life of the cylinder liner 10.

Abstract: A cylinder block for a multi-cylinder engine is provided with a water jacket partly on an intake side of a row of cylinders and partly on an exhaust side of the row of cylinders and a water guide passage through which cooling water is introduced into the water jacket. The cylinder block is provided with oil return passages each of which extends straight from top to bottom of the cylinder block between each adjacent cylinders. A branch oil return passage branches off from a middle portion of the rearmost oil return passage and extends rearward up.

Abstract: An improved sealing arrangement 40 is provided for a replaceable cylinder liner 10. The sealing arrangement 40 includes a seal 26 in the form of a band that is positioned in an annular groove 28 under a flange seat 20 of the cylinder liner 10. The annular groove 28 includes a first and a second undercut 30,34 that provides a relief area for the seal 26 to deflect into lessening the opportunity of damage to the seal 26. The first and second undercuts 30,34 also relieve stress in the axial direction improving the fatigue life of the cylinder liner 10.

Abstract: The invention relates to an internal combustion engine comprising a cylinder block with at least one cylinder and at least one intake and exhaust valve per cylinder. A cooling system includes an inlet opening that is formed in the cylinder block and leads to a first coolant space in the cylinder block. At least one restriction element is arranged in the first coolant space. A second coolant space is arranged in a cylinder head and inlet ports are arranged in the cylinder head which connect the first and second coolant spaces to one another. The inlet ports are principally situated on an exhaust side of the cylinder head. Outlet ports are arranged in the cylinder head and connect the first and second coolant space to one another. The outlet ports are principally situated on an intake side of the cylinder head. An outlet opening formed in the cylinder block has a connection to the first coolant space.

Abstract: A closed deck type cylinder block providing an optimum area ratio of opening at a top deck side, and a method for producing such cylinder block having the reduced area ratio of the opening at a reduced energy cost and with reduced labor, yet exhibiting smooth discharge of waste sand converted from a water jacket core through the opening in spite of the reduced area ratio of the opening. The cylinder block is formed with a plurality of cylinders juxtaposedly arranged to each other and a water jacket portion surrounding the cylinders. An upper end of the water jacket portion is open at a top deck and is partly covered with bridge portions. The opening has an area ratio of from 10 to 30% of a projection area of the water jacket portion at the top deck surface.

Abstract: The invention relates to an internal combustion engine with at least one cylinder bank of cylinders (12) arranged in a row in at least one cylinder block, and at least one fluid cooling system allocated to a particular cylinder bank. Said fluid cooling system has at least one fluid channel (10) configured in a cylinder block. This fluid channel (10) conducts fluid through the cylinder block in order to provide a water jacket adjacent to the cylinders (12) for cooling the same. Said fluid channel (10) is delimited by a floor (16) on the crankcase side in a cylinder block situated between a cylinder head and the crankcase. This floor (16) of the fluid channel (10) is configured in the form of a curved plane.

Abstract: A cylinder block for a multi-cylinder engine is provided with a water jacket partly on an intake side of a row of cylinders and partly on an exhaust side of the row of cylinders and a water guide passage through which cooling water is introduced into the water jacket. The cylinder block is provided with oil return passages each of which extends straight from top to bottom of the cylinder block between each adjacent cylinders. A branch oil return passage branches off from a middle portion of the rearmost oil return passage and extends rearward up.

Abstract: An engine block having a cooling system includes a body, a plurality of cylinder bores formed on the body, cylinder liners each coaxially fitted in a corresponding cylinder bore, and at least one coolant channel formed between the cylinder bores, wherein each cylinder liner has recesses on an outer surface facing other cylinder bores for securing space for forming the coolant channels.

Abstract: A cylinder block, often a siamese cylinder block, for an internal combustion engine having a heat pipe located in each of the common walls between adjacent cylinders where at least one of the ends of each heat pipe extends into the cylinder block coolant passage such that heat emanating from each cylinder flows into an adjacent portion of one or more heat pipes and flows through the pipes by continuous evaporation and condensation of the pipe's working fluid into the engine coolant.

Abstract: In a water-cooled outboard marine engine, a heat transfer portion is provided in an exit passage located between an outlet end of a cylinder water jacket and a cooling water outlet passage at a position upstream of the thermostat valve. Thus, when the thermostat valve has opened and the cooling water expelled from the water jacket via the thermostat valve has been replaced by freshly introduced cooling water, the heat transfer portion having a certain heat capacity warms the freshly introduced cooling water so that the rapid change in the cooling water temperature at the thermostat valve and the resulting hunting of the thermostat valve can be avoided.

Abstract: In a cooling structure of a cylinder block, a cooling medium is supplied into the cylinder block in which a water jacket continuously extends around a bore wall, so as to uniform the bore wall temperature. The cooling structure sets a cooling characteristic of the water jacket based on at least one of variation in the bore wall temperature in a direction perpendicular to the axis of the borehole and variation in the temperature of the cooling medium flowing around the bore wall. The structure improves the cylinder bore cooling efficiency or the cooling uniformity.

Abstract: A cylinder block for a water-cooled internal combustion engine has a top deck, a cylinder wall structure defining a row of cylinder bores, and a water jacket wall structure defining a water jacket around the cylinder bores. The jacket wall structure has a plurality of cylinder head bolt bosses each formed with a bolt hole for a cylinder head bolt for fastening a cylinder head on the top deck of the cylinder block. At least one of the head bolt bosses is a terminal head bolt boss which is formed at an end portion of the cylinder block, and which is connected, by a rib, with the cylinder wall structure and the top deck to prevent stress concentration and cracks.

Abstract: An internal combustion engine includes a siamese engine block having cylinders defined by cylinder walls arranged in series with adjoining cylinders sharing a common wall. The engine block has a coolant jacket defined by a coolant jacket wall radially positioned parallel to and outboard of the cylinder walls to define a coolant passage for coolant flow through the engine block. The coolant passage includes an arc passage and a V-bend passage where the V-bend passage is adjacent the common wall of the adjoining cylinders. The V-bend passage is configured as a narrow rectangular portion having a coolant pocket projecting inboard from the rectangular portion into the common wall to provide heat transfer from the common wall of the cylinder. The cylinder wall includes a protrusion extending into the arc passage and disrupts flow from about the upper one-half of the coolant pocket.

Abstract: An integral cylinder block is provided having features which enhance structural stiffness, thereby reducing noise emissions. The block includes an upper portion with cylinder bores and a lower portion forming at least a part of a crankcase. At the upper and lower portions of the block, the casing has sculpted wall portions with a curved, undulate shape. At a side of the cylinder block, a closed oil cooler cavity is formed. A wall is provided to generally separate the oil cooler cavity from the water jacket defined within the block. An opening is provided in the wall, but the opening is distally located relative to a water pump outlet that provides a flow of coolant into the cavity, thereby improving the flow direction of coolant across the oil cooler. Also, an opposite side of the cylinder block includes a closed tappet cavity to accommodate pushrods.

Abstract: In an engine block having cylinder cavities arranged close together, a cooling duct is produced in an intermediate wall between the cylinders by pouring the casting material around a mold core made preferably from a material that is soluble in a liquid, combustible and/or brittle, so that the mold core can easily be removed from the duct once the casting has solidified. In the casting mold, the duct mold core is secured solely at its ends so that a cooling duct is formed that is bordered exclusively by a skin of casting material.

Abstract: An internal combustion engine comprising a cylinder block (1) with at least two cylinders (8) and at least two exhaust valves (12) per cylinder (8), a slit (28) in the cylinder block (1) between each pair of cylinders (8), and a cooling system which comprises an inlet opening (36) for cooling liquid (20), formed in the cylinder block (1), an outlet opening (42) for cooling liquid (20), formed in a cylinder head (2), a restriction member (34) which is arranged in the cylinder block (1) and guides most of the cooling water flow to an intake side (38) of the cylinder block (1), and cooling liquid channels (18a-18e) in the cylinder head (2) which are chiefly located on an exhaust side (40) of the cylinder head (2). The cooling liquid channels (18a-18e) open into the cylinder head (2) in an area between the exhaust valve seats (16) for each cylinder (8) and thereby regulate at the same time the flow and cooling around the cylinder liners (32) and between the exhaust valve seats (16).