Abstract:
There is provided an engine for a small vehicle where driven sprockets, around which a cam chain for transmitting power from a crankshaft is wound, are provided at one end of camshafts that form a part of a valve system provided with hydraulic valve-operation mode changing mechanisms; and a valve-moving hydraulic pressure control device, which controls hydraulic pressure applied to the valve-operation mode changing mechanisms, is provided in the engine body. In the engine, it is possible to increase the degree of freedom in disposing the oil passage between the valve-operation mode changing mechanism and the valve-moving hydraulic pressure control device while avoiding the increase in the number of parts and assembly man-hours. A valve-moving hydraulic pressure control device is mounted on the side surface of the engine body on the side opposite to a cam chain in an axial direction of a camshaft.
Abstract:
A variable valve system varies an operation condition of an engine valve by controlling an angular position of a control shaft in accordance with an operation condition of the engine. The system has an actuating mechanism for actuating the control shaft. The actuating mechanism comprises a mounting member that is connected to one end of the control shaft by means of bolts and has a projection projected axially in an opposite direction of the control shaft; a permanent magnet piece that is mounted on the projection thereby to rotate together with the control shaft; and a sensing device that senses a rotation condition of the permanent magnet piece.
Abstract:
To provide a valve timing control apparatus which allows attachment of both a driven device and a valve timing control apparatus to one end of a cam shaft while restricting increase in the total length of an internal combustion engine in the axial direction of the cam shaft and which has high versatility and can restrict weight increase also.The apparatus includes a driving rotational member 5, 51, 52 rotatable in synchronism with a crank shaft of an internal combustion engine, a driven rotational member 4 disposed coaxial relative to the driving rotational member 5, 51, 52, a fastening member 7 extending through the driven rotational member 4 from one axial end to the other axial end thereof, the fastening member being fastened to a cam shaft 3 of the internal combustion engine at the other axial end of the driven rotational member 4, thereby fixing the driven rotational member 4 to the cam shaft 3 and an engaging means 8 disposed at one axial end relative to the driving rotational member 5, 51, 52 and having an engaging groove 81 for attachment of a driven device 9, said engaging means being integrally formed at one axial end of the fastening member 7.
Abstract:
In an engine valve operating system, a camshaft (36) is supported via a bearing (41) on a cylinder head (5) having an intake valve (29i) and an exhaust valve (29e) provided therein, and an intake rocker arm (38i) and an exhaust rocker arm (38e) are mounted on a rocker arm shaft (42) supported on the cylinder head (5) so as to be parallel to the camshaft (36), the intake rocker arm (38i) and the exhaust rocker arm (38e) respectively providing a connection between the camshaft (36) and the intake valve (29i) and between the camshaft (36) and the exhaust valve (29e). A fixing bolt (44) that abuts against an end part of the rocker arm shaft (42) so as to restrict movement thereof in the thrust direction is screwed into the cylinder head (5), and a flange seat (44a) that abuts against one side face of the bearing (41) so as to restrict movement thereof in the thrust direction is formed integrally with the fixing bolt (44). Therefore, there is provided a compact engine valve operating system in which means for restricting movement in the thrust direction of a camshaft and a rocker shaft is shared to thus reduce the number of components and simplify the structure.
Abstract:
The present invention provides a motorcycle having a valve-operating mechanism for actuating a valve which opens and closes a combustion chamber of an internal combustion engine. The valve-operating mechanism includes a biasing means for biasing the valve toward a valve closing direction and a drive means for driving the valve toward the valve opening direction against the biasing means, the biasing means is a gas spring formed by filling a gas spring chamber with compressible gas, and a compressed-gas container for supplying the compressible gas is connected to the gas spring chamber, and the compressed-gas container is disposed in an outermost line of body components of the motorcycle except for the compressed-gas container when the motorcycle is viewed from above.
Abstract:
A variable valve train system for an internal combustion engine wherein the engagement section of a transmission mechanism is lubricated by means of an existing part for driving a variable valve actuation mechanism. Gears forming the engagement section of the transmission mechanism are arranged at a position where the engagement section is lubricated with a lubricant scattered from an endless elongate member for driving a camshaft. The transmission mechanism can therefore be lubricated without the need for additional use of a lubricant passage and its associated elements, besides the existing parts for driving the variable valve actuation mechanism.
Abstract:
A camshaft adjuster (1) for an internal combustion engine, which is attached on the end to a camshaft (2) and which acts as a transmission element to a drive wheel (3) for the rotating drive of the camshaft (2), with an internal wheel (4) locked in rotation with the camshaft (2) and a coaxial external wheel (5) that can rotate relative to the internal wheel. A control valve with a valve slide (6) is provided for controlling a fluid for pressurizing pressure spaces (20) arranged between the internal wheel (4) and the external wheel (5), and is provided coaxial to the internal wheel (4), in order to create angular adjustment between the internal wheel (4) and the external wheel (5). The internal wheel (4) has a central valve slide space (24) extending in the axial direction toward the camshaft (2) in which the valve slide (6) is held so that it can move in the axial direction and the valve slide space (24) of the internal wheel (4) includes at least one control edge (7), with which the valve slide (6) interacts in a sealing manner.
Abstract:
In a valve timing controlling apparatus having: a first rotary body rotatable with a cam shaft of an internal combustion engine; a second rotary body rotatable with a crank shaft and rotatable relative to the first rotary body; a controlling means for varying relative rotational phase between the first rotary body and the second rotary body; and a torsion coil spring for urging the first rotary body relative to the second rotary body in a phase advancing direction. The coil portion 22 of the torsional coil spring 20 includes a pair of holding areas 23a, 23b extending continuously from the respective retaining portions and capable of fixing the coil portion in position relative to the first rotary body 1 and the second rotary body 2 and includes also a torque generating area 25 disposed between the pair of holding area. The holding areas and the torque generating area have different coiling diameters.
Abstract:
A method for controlling an engine airflow, the engine having at least one cylinder, the engine also having an intake manifold and an outlet control device for controlling flow from the intake manifold into the cylinder, comprising of generating a desired engine torque, generating a desired cylinder air charge amount based on said desired engine torque and changing the outlet control device to provide said desired cylinder air charge amount and thereby provide said desired engine torque.
Abstract:
Internal combustion engine and method with compression and expansion chambers of variable volume, a combustion chamber, a variable intake valve for controlling air intake to the compression chamber, a variable outlet valve for controlling communication between the compression chamber and the combustion chamber, means for introducing fuel into the combustion chamber to form a mixture of fuel and air which burns and expands in the combustion chamber, a variable inlet valve for controlling communication between the combustion chamber and the expansion chamber, a variable exhaust valve for controlling exhaust flow from the expansion chamber, means for monitoring temperature and pressure conditions, and a computer responsive to the temperature and pressure conditions for controlling opening and closing of the valves and introduction of fuel into to the combustion chamber to optimize engine efficiency over a wide range of engine load conditions. The relative volumes of the compression and expansion chambers and the timing of the valves are such that the pressure in the combustion chamber remains substantially constant throughout the operating cycle of the engine, and exhaust pressures are very close to atmospheric pressure regardless of the load on the engine. The engine runs so quietly and burns so cleanly that in some applications it may not require a muffler and/or a catalytic converter.