Abstract: There is provided a V-type engine, in which deck cylinder parts of a cylinder block are offset in the same direction as a rotational direction of a crankshaft, and oil separation chambers are provided at an upper portion of the cylinder head displaced to a lower side by the offset. Therefore, an allowance in the axial direction of cylinders may be provided above a cylinder head of the deck cylinder parts on the lower side, and the capacity of the oil separation chambers is increased by the allowance so that the oil separation performance may be improved, while an increase in the total width and total height of an engine block is suppressed.

Abstract: An internal combustion engine; having block valley radiator core, with electrical water pump and air cooling fans, cooling and circulating water through block water passages, and having block valley oil reservoirs positioned under block valley radiator core for oil storage cooling and directing oil through oil passages. Includes; cylinderhead having horizontally rotating valveshaft; having separate axially spaced intake and exhaust valvepockets between ringseals, being timed rotated, centrally above dual spark plug ignition combustion chambers, over piston cylinders, and communicating centrally between cylinderhead intake and exhaust chambers—having port passageways, with connected intake and exhaust manifolds, providing strainfree; opening and closing combustion chambers, highspeed valvepocket(s) rotation, highflow air-fuel intaking and combustion exhausting—velocity capabilities. The valveshaft provides installation and removal without removing cylinderhead from engine block.

Abstract: A V-twin engine includes a two cylinder reciprocating apparatus, having a pair of connecting rods joined to a crankshaft through a pair of connecting rod journals that are centered at a common throw radius from the crankshaft axis, and angularly displaced from one another along the throw radius by an angular displacement equal to an included angle defined by axes of the cylinders, so that the pistons will move in unison and each reach top dead center (TDC) and bottom dead center (BDC) in their respective cylinders at substantially the same time. The cylinders fire alternately on sequential rotations the crankshaft. Counterweights on two balance shafts rotate in a 1:1 rotation ratio in a direction opposite to the crankshaft, with forces from the balance shaft counterweights and a crankshaft counterweight alternately aligning and opposing for counterbalancing vertical forces and unbalance loads in the engine.

Abstract: A first balancing shaft and a second balancing shaft are provided for an internal-combustion engine having four cylinders in a V-arrangement. The free inertial forces of the second order are reduced by way of the balancing shafts. The second balancing shaft is arranged in the point of intersection of the cylinder Vs above the crankshaft. The rotation center points of the two balancing shafts and of the crankshaft are situated on a perpendicular axis of symmetry which extends through the point of intersection.

Abstract: To provide a bearing device for a rotary shaft which can further restrain the damage to a sliding bearing, by determining the position of a parting surface of the sliding bearing taking into account the position of the maximum pressure of an oil film. A bearing device includes a pair of sliding bearings for rotatably bearing a crankshaft of an internal combustion engine, and an oil supply passage for supplying a lubricating oil into clearances between the crankshaft and the sliding bearings. The sliding bearings are composed of bearing halves bisected at a parting surface located on a flat plane, substantially orthogonal to the direction of the maximum pressure of the oil films, formed of the lubricating oil in the clearances. The bearing device is applicable to an internal combustion engine including a cylinder having an inclined cylinder axis, which reduces the vibration and noise of the internal combustion engine.

Abstract: A rotor housing (2) has flanges (8) projecting to two sides in the directions of axes of rotors and having suction flow outlets for suction pipes (33) which are integrally connected to the rotor housing (2). The rotor housing (2), a collector housing (21), and the suction pipes (33) are integrally formed of aluminum alloy casting. The lower surfaces of the flanges (8) of the rotor housing (2) are used as attaching surfaces to be attached to the upper surface of a cylinder head.

Abstract: A first balancing shaft and a second balancing shaft are provided for an internal-combustion engine having four cylinders in a V-arrangement. The free inertial forces of the second order are reduced by way of the balancing shafts. The second balancing shaft is arranged in the point of intersection of the cylinder Vs above the crankshaft. The rotation center points of the two balancing shafts and of the crankshaft are situated on a perpendicular axis of symmetry which extends through the point of intersection.

Abstract: A V-type engine for vehicle of the present invention includes: a crank shaft; a cam driving intermediate shaft arranged above the crank shaft; a power transmitting mechanism interconnecting the cam driving intermediate shaft and the crank shaft; cam driving chain mechanisms respectively interconnecting the cam driving intermediate shaft and each of front and rear cam shafts; a change gear input shaft; a change gear output shaft arranged in a back part in a mission chamber; and a tensioner for the cam driving chain mechanism for the rear cam shaft. The change gear input shaft and the tensioner are positioned within a range between a line connecting an axis of the change gear output shaft and an axis of the crank shaft and the rear cylinder unit.

Abstract: A balancer shaft is positioned on the center plane which divides cylinder banks of a V-type engine and which passes through an axis of the crankshaft, and is positioned directly below the crankshaft, whereby the balancer shaft is in close proximity to the crankshaft to cancel vibration forces.

Abstract: An tuned induction system for use on a motorcycle having a V-twin engine. The tuned induction system having separate and individual first and second manifold bodies. Each of the separate intake manifold bodies having a flange that couples the individual manifold body to a cylinder head of the V-twin engine. The flange having a continuous radius that maximizes airflow velocity to enhance engine performance.

Abstract: A V-type engine for vehicle of the present invention includes: a crank shaft; a cam driving intermediate shaft arranged above the crank shaft; a power transmitting mechanism interconnecting the cam driving intermediate shaft and the crank shaft; cam driving chain mechanisms respectively interconnecting the cam driving intermediate shaft and each of front and rear cam shafts; a change gear input shaft; a change gear output shaft arranged in a back part in a mission chamber; and a tensioner for the cam driving chain mechanism for the rear cam shaft. The change gear input shaft and the tensioner are positioned within a range between a line connecting an axis of the change gear output shaft and an axis of the crank shaft and the rear cylinder unit.

Abstract: The object of the present invention is to provide an air cleaner for a vehicle capable of preventing introduced air from directly striking an air cleaner element and of reducing a decrease in intake efficiency to a minimum. The air cleaner unit for a vehicle of the present invention is provided with an air cleaner box 12, an air cleaner element 16 mounted on an upper portion in the air cleaner box, an exhaust port 12a formed at the upper front portion of the air cleaner box 12, an intake port 12b formed on the side of the exhaust port at the front portion of the air cleaner, and an intake duct 15 inserted into the air cleaner box through the intake port, wherein the downstream of the intake duct is linearly mounted toward the lower rear portion in the air cleaner box and an opening in the downstream of the intake duct is arranged below the air cleaner element.

Abstract: An improved four stroke engine for outboard motor having a protective cowling encircling the engine. The four stroke engine has V-shaped banks of cylinders and each bank is provided with a couple of overhead camshafts extending generally vertically. The engine has also a single crankshaft extending generally vertically. The crankshaft has a driving wheel, while each camshaft positioned on the inside of each bank has a driven wheel, which diameter is twice as large as the diameter of the driving wheel. The driven wheels on the camshafts are driven by an endless transmitter wound around the driving wheel and the driven wheels. The other camshafts of the respective banks are driven by the camshafts, which are directly driven by the crankshaft, with drive mechanisms. In another embodiment, both of the camshafts of the respective banks are driven by a couple of intermediate shafts and driven wheels placed on them. The driven wheels on the intermediate shafts are driven by the driving wheel on the crankshaft.

Abstract: An improved compact engine construction that facilitates positioning in close quarters while still affording ease of assembly and servicing. This is accomplished by mounting the camshafts at different heights and by providing a two-piece spark plug tube in the cylinder head that facilitates removal in sections rather than all at once.

Abstract: A two-cylinder overhead-valve V-engine has two cylinders arranged so as to form a V-bank (S). Each cylinder is provided with push rods (15, 16) for operating an intake valve rocker arm (12) and an exhaust valve rocker arm (13). The push rods (15, 16) of each cylinder extend gradually away from each other toward a valve rocker arm chamber. An air intake passage is formed between the push rods (15, 16) in the cylinder head (3) of each cylinder. An air intake port (24) is formed in the cylinder head (3) so as to open into the V-bank (S). The air intake port (24) of each cylinder head (3) is connected by the air intake passage formed in the V-bank (S) to a carburetor disposed in the V-bank (S). A water jacket outlet (25) is formed near the air intake port (24) in a part of the cylinder head (3) in between the push rods(15,16). The water jacket outlets (25) of the cylinder heads (3) are connected by a cooling water passage adjacent to the air intake passage.

Abstract: The present invention provides an improved engine for aeronautical applications which includes a core engine block having a drive shaft rotatably mounted within the core engine block and a motive device for rotating the drive shaft. A propeller speed reduction unit is connected to the drive shaft for transferring power from the drive shaft to a propeller and an accessory drive gearbox is connected to the drive shaft for transferring power from the drive shaft to at least one accessory device. The accessory drive gearbox includes an accessory drive crank gear connected to the drive shaft and a drive gear intermeshing with the crank gear. Finally, at least two inter-module dampers are mounted in the engine, one each of the inter-module dampers positioned between the core engine block and the accessory drive gearbox and the core engine block and the propeller speed reduction unit to dampen and isolate vibrations.

Abstract: A coolant passage structure of a small V-type liquid cooled engine is provided for introducing coolant from a water pump to water jackets respectively formed in cylinders and for cooling the cylinders. The water pump is provided in a generator cover placed in a side portion of the engine or in the vicinity of the generator cover. The coolant passage structure includes a coolant passage integrally formed in the generator cover. A water gallery is formed in a crank case of the engine for supplying the coolant to the respective cylinders. The water gallery is located in the vicinity of lower ends of the cylinders and extends in a direction substantially parallel to a crank shaft of the engine between the cylinders. The coolant passage is connected to the water gallery.

Abstract: In an internal combustion engine with two cylinder banks, each cylinder bank having a cylinder head mounting thereon a valve operating device enabling both valve timing and valve lift characteristic to be varied, each valve operating device drives an engine valve through an eccentric cam, a substantially ring-shaped link, a rocker arm, a rod-shaped link, and a rockable cam, by rotation of a drive shaft. A control shaft varies the attitude of the rocker arm via a control cam by rotary motion thereof, in order to change a valve lift characteristic of the engine valve. As viewed in the same axial direction, a lifting direction of the rockable cam relative to a rotational direction of the drive shaft is the same in the two cylinder banks.

Abstract: An over-head cam type V-type engine comprises a crank shaft provided to penetrate through a crank chamber, a cam shaft provided in a head portion of each of two cylinders provided above the crank chamber, an intermediate shaft provided to penetrate through the crank chamber, a chain chamber for accommodating a chain to transmit a rotation of the crank shaft to the intermediate shaft, a first chain tunnel for accommodating a chain to transmit a rotation of the intermediate shaft to the cam shaft of one of the first and second cylinders, a second chain tunnel for accommodating a chain to transmit the rotation of the intermediate shaft to the cam shaft of the other cylinder, forcible oil supply means for supplying a lubricating oil from an oil sump to the head portion of each of the first and second cylinders, a first lubricating oil feedback path formed to reach the oil sump from the head portion of one of the first and second cylinders through the first chain tunnel and the crank chamber, and a second lubricat

Abstract: A drive unit for a motorcycle includes an internal combustion engine with at least two cylinders arranged in V-position, a clutch and a transmission, the transmission being located in the space between the cylinders.

Abstract: To provide a multi-cylinder engine for a vehicle, in which a pair of cylinder bore rows, each including a plurality of cylinder bores disposed in parallel to each other, are disposed in such a manner as to be perpendicular to a crank shaft disposed substantially in the horizontal direction. Accordingly, a relatively large space can be ensured under a cylinder head. Cam shafts corresponding to cylinder bore rows are disposed over a pair of planes containing the axial lines of cylinder bores constituting the cylinder bore rows, respectively.

Abstract: A liquid-cooled internal combustion engine has cylinder banks that tilt toward one another, to for a V engine. A coolant, which is fed to the exhaust gas-sided cooling jackets in the cylinder banks, is fed over cylinder heads with cross flow to cooling jackets. The coolant drains over break-throughs in the cylinder bank boundaries into an outflow line in the V-space. The outflow line and the inflow line are connected to a coolant pump. The coolant is fed from the inflow line over distribution channels at a housing end to the exhaust gas-sided cooling jackets.

Abstract: A motorcycle oil pump that provides a fixed shaft with high volume rotor gears and adjustable oil pressure.

Abstract: This invention relates to a drive unit for a motorcycle, comprising an internal combustion engine with at least two cylinders arranged in V-position, a clutch and a transmission. A particularly compact configuration is obtained by disposing the transmission in the space between the cylinders.

Abstract: A control device for camshaft systems of an internal combustion engine with n banks of cylinders arranged in a V-shaped configuration. The control device has a distribution system with a first distributor gear which intermeshes with an output gear arranged on a crankshaft of the internal combustion engine. The distribution system has m<n secondary distributor gears which intermesh with the first distributor gear and transmit a driving force to the n camshaft systems of the n banks of cylinders through n endless-chain drives.

Abstract: A cam shaft driving structure of an SOHC V-type engine comprises a crank shaft; a first cam shaft and a second cam shaft respectively provided in a cylinder head of a first cylinder and a cylinder of a second cylinder; an intermediate shaft rotatably provided in an upper portion of the crank case, a first cam chain and a second cam chain, an intermediate shaft chain; a first cam chain guide and a second cam chain guide for respectively guiding a tense side of the first cam chain and a loose side of the first cam chain; and a third cam chain guide and a fourth cam chain guide for respectively guiding a tense side of the second cam chain and a loose side of the second cam chain guide, wherein a fulcrum of the second cam chain guide and a fulcrum of the fourth cam chain guide are provided in the vicinity of the intermediate shaft, a first tensioner for the cam chain guide associated with one of the first and second cam chains in which its loose side corresponds to its upper side is provided in the corresponding

Abstract: A V-2 engine includes two cylinder blocks mounted to a crankcase such that the respective cylinder axes of the cylinder blocks extend at an angle to each other and merge together at the axis of a crankshaft with the angle formed between the cylinder axes being divided into two angle parts by a centerline of the crankcase passing through the axis of the crankshaft, and an auxiliary machine mounted to the crankcase on the same side as one of the cylinder blocks when viewed from the axis of the crankshaft. In order to reduce the maximum width of the engine, the cylinder blocks are offset from a symmetric position with respect to the centerline of the crankcase to such an extent that a straight line circumscribing an outer end of a head cover attached to the one cylinder block and an outer end of the auxiliary machine is in parallel to the centerline of the crankcase.

Abstract: A two-cylinder overhead-valve V-engine has two cylinders arranged so as to form a V-bank (S). Each cylinder is provided with push rods (15, 16) for operating an intake valve rocker arm (12) and an exhaust valve rocker arm (13). The push rods (15, 16) of each cylinder extend gradually away from each other toward a valve rocker arm chamber. An air intake passage is formed between the push rods (15, 16) in the cylinder head (3) of each cylinder. An air intake port (24) is formed in the cylinder head (3) so as to open into the V-bank (S). The air intake port (24) of each cylinder head (3) is connected by the air intake passage formed in the V-bank (S) to a carburetor disposed in the V-bank (S). A water jacket outlet (25) is formed near the air intake port (24) in a part of the cylinder head (3) in between the push rods (15, 16). The water jacket outlets (25) of the cylinder heads (3) are connected by a cooling water passage adjacent to the air intake passage.

Abstract: An overhead camshaft V-2 engine includes a single power transmitting mechanism disposed on one side of a crankcase for transmitting rotational power from a crankshaft to respective camshafts of drive valve mechanisms. The power transmitting mechanism has a driving member mounted to only one end portion of the crankshaft. The thus arranged power transmitting mechanism enables downsizing of the engine. Two intake ports are formed in respective cylinder heads of two cylinder blocks and open at one end to respective first surfaces of the cylinder heads facing in a first direction, and two exhaust ports are formed in the respective cylinder heads of the cylinder blocks and open at one end to respective second surfaces of the cylinder heads facing in a second direction opposite to the first direction. With this arrangement of the intake and exhaust ports, intake pipes can be arranged with a high degree of freedom.

Abstract: A torque increasing opposite direction engine employs not a combustion pressure but a high pressure medium by using a differential shifting distance and velocity per angle and a differential equivalent distance of a crank radius depending on a crank angle to thereby have a common joining section of two pistons reciprocating each other in such a way that each upper dead point of two pistons presents in the upper dead point of any one piston in an opposite site to reduce a volume of the combustion chamber in burning. The inventive crank radius is same or different and a suction and an exhaust valves are positioned to a site away from an upper dead point of the piston located at the upper dead point in burning. When one piston is an upper dead point another piston is past the upper dead point. When the equivalent distance is large, a combustion pressure in a narrow space is increased by narrowing the distance between two pistons, thereby increasing a generated torque.

Abstract: Abstract This engine configuration is a crankshaft driven semi-radial piston engine having three banks of three cylinders. It resembles a V-six but has an additional bank of three cylinders centered on a plane dividing the in-line V symmetrically in half through the crankshaft axis. Either outside bank of three cylinders would form a V-six type engine, taken together with the middle bank. The crankshaft has throws at 120 degrees between the nodes with all pistons in a particular in-line bank connected to the crankshaft at a different throw angle. Each cylinder contains one piston that connects to the crankshaft via a typical conecting rod. All pistons in one in-line bank connect to a different node throw angle. Starting with any piston at its TDC position, each 40 degrees will bring a different piston to its TDC position until 360 degrees of crankshaft rotation brings the first back to its TDC position.

Abstract: An internal combustion engine having four individual cylinder banks, in each case two cylinder banks being arranged in a V-shape with respect to one another in such a way that the cylinder banks forming a V are disposed on both sides of one engine plane E defined by a vertical axis H that symmetrically divides the internal combustion engine and by a longitudinal axis L of the internal combustion engine, one cylinder bank of the cylinder banks that are associated with one another in a V-shape being configured closer to the engine plane E or the vertical axis H than the cylinder bank that is diametrically opposed with respect to the engine plane E. The present invention is intended for use in mixture-compressing internal combustion engines having externally supplied ignition, but also for air-compressing, self-ignition internal combustion engines.

Abstract: This invention relates to an internal combustion engine for a motorcycle, with two or more single cylinders arranged in a plane approximately normal to a crankshaft, each cylinder accommodating a reciprocating piston and the pistons acting via connecting rods on the same crank of the crankshaft supported in a crankcase. To reduce manufacturing expense, the engine is to be provided with modular components for universal use with at least two different cylinder arrangements (V-type, W-type).

Abstract: An improved two stroke cycle engine is disclosed. The engine has an intake port for passing air into a cylinder of the engine and has a piston within the cylinder for reciprocal movement between a top dead center position and a bottom dead center position. The engine includes a crankcase, an intake valve in a wall of the crankcase, a plenum chamber for supplying air to the intake port and an output valve positioned between the crankcase and the plenum chamber. The engine also includes an air compressor and an air compressor valve positioned between the air compressor and the plenum chamber. The engine has a first mode of operation during startup wherein the piston draws air into the crankcase through the intake valve and then forces air from the crankcase, through the output valve, into the plenum chamber and to the intake port.

Abstract: First and second gears are interposed, respectively, between first and second endless power transmission belts each for driving a camshaft of a cylinder head of each of V-shaped cylinder banks and a crankshaft 7. A pair of balancer shafts are provided at symmetrical positions with respect to a separating plane acting as a center therebetween where an upper block and a lower block of a cylinder block are separated from each other from a horizontal plane passing through a center of the crankshaft in such a manner that axes of the pair of balancer shafts become parallel with the crank shaft. The crankshaft and the balancer shaft on the lower block side are connected to each other by means of a third endless power transmission belt. The balancer shafts are connected to each other by means of third gears, so that the pair of balancer shafts are driven to rotate in the opposite directions.

Abstract: In a V-type engine including first and second pistons connected to a common crank pin of a crankshaft through first and second connecting rods, a large end of each of the connecting rods is formed so that its lower surface assumes a substantially horizontal attitude at a most-lowered position of the crank pin. This ensures that even if the construction is such that the large ends of the conducting rods do not contact with a defined amount of oil stored in lower portion of a crankcase in the V-type engine, the lower portion of the crankcase can be formed at a small depth, thereby lowering the entire height of the V-type engine.