Abstract:
The invention concerns valve gear (1) for simultaneously actuating, for example, three equally acting gas-exchange valves (2), longitudinal axes of the gas-exchange valves (2) being disposed such that they form an angle relative to one another. According to the invention, a bridge (4) is disposed between cams on a camshaft (3) and the gas-exchange valves (2), the guide means (5) of the bridge (4) extending with its longitudinal axis (9) parallel to a median line (10) between the longitudinal axes of the gas-exchange valves (2a, 2b).
Abstract:
Multiple intake valves operatively associated in a common combustion chamber are advantageous in that the design achieves high output for an internal combustion engine. The subject modified cylinder head utilizes the advantages available in a multiple intake valve system, but further enhances the design by reducing heat rejection. In the subject modified cylinder head, three intake valves (38, 40, 42) having corresponding intake valve ports (26, 28, 30) and one exhaust valve (68) having an exhaust valve port (66) are operatively associated in a common combustion chamber. A reduction in heat rejection is achieved through a relationship between the cross-sectional areas of the intake and exhaust valve ports (26, 28, 30, 66). The intake valve ports (26, 28, 30) are constructed so that their cross-sectional area is larger than about 69 % of the combined cross-sectional area of the intake and the exhaust ports (26, 28, 30, 66).
Abstract:
A valve mechanism in an internal combustion engine, wherein a driving rocker arm interlockingly connected to an air intake valve and a free rocker arm capable of becoming independent of the air intake valve are interposed between a cam shaft and at least the air intake valve out of the air intake valve and an exhaust valve which are biased by springs in the valve-closing direction, each of the rocker arms is provided with a connection switching mechanism for switching between connection and release, and a lost motion mechanism for resiliently biasing the free rocker arm toward the cam shaft is provided on a main body of the engine, said lost motion mechanism (38) being provided on the main body of the engine (E) upwardly of the driving rocker arm (26), so that a sufficient space can be secured under the respective rocker arms (24-26).
Abstract:
An internal combustion engine cylinder head has three inlet valves (65a, b, c) whose axes do not all lie in the same plane, one of which are being inclined to others (angle y°). All three inlet valves (65) are operated by the same rocker (63). To obtain geometrically similar operating motions, the valve stem engaging tappets carried by the rocker are angularly spaced about the rocker axis (63A) at the same angular spacing (y°) as the inclination of the valve stem axes and the length of each valve stem is chosen to ensure that all three valves are operated simultaneously.
Abstract:
Valve mechanism (1) for an internal combustion engine operable to selectively open and close a gas exchange valve (3) to accomplish an engine brake during an engine brake mode of an engine, said valve mechanism comprising a cam follower (5) in biased abutment against a gas exchange cam element (7) for actuation of a rocker arm (9) connected to said gas exchange valve (3).
Abstract:
The invention relates to a mechanism (l) for varying the valve stroke of an internal combustion piston engine to any rate between zero stroke and nominal stroke, where there is a valve actuating camshaft (27), the cam (28) of which is constantly in contact with the contact surface (24) of a single-arm rocker lever (19); the single-arm rocker lever (19) is pinned on a stationary pin (23) at one of its ends, and at the other rotating end a rocker pivot (9) is fitted using an axis parallel with the stationary pin (23), on which one end of the lifting rocker lever (6) is pinned, and at the other end a pressure surface (7) resting on the stem (4) of the actuated valve (2) is arranged. According to the invention the lifting rocker lever (6) is fitted with a support surface (13) for turning around the rocker pivot (19), and it is permanently in contact with the guiding curve (35) of a guiding block (32) pinned in a movable way, the basic position of which is assigned to the zero stroke position of the valve (2) and the other extreme position is assigned to the nominal stroke position, with the middle stroke assigned to the current position in the middle, and the guiding block (32) is in communication with the engine control/regulator actuating member controlling the valve lift.
Abstract:
The invention concerns a multi-cylinder internal-combustion engine in which the cylinders (1, 2) are disposed in two rows, the cylinders (1) in one row being staggered with respect to the cylinders (2) in the other row and the longitudinal axes of the cylinders in the first row being disposed at an angle to the longitudinal axes of the cylinders in the other row. The outlet valves (11, 11') are located close to the plane of symmetry (S) between the rows of cylinders whereas the inlet valves (7, 7') are located out of this plane. Provided for all the outlet valves of both rows of cylinders is a common centrally located camshaft (14) and provided for the inlet valves of each row of cylinders are dedicated side-located camshafts (15 and 15', respectively).
Abstract:
A multi-valve engine has a plurality of inlet channels (2, 3) each having a choke (6) and a fuel injection (7) as well as an intake valve (5). The intake channels, which run in different directions, are arranged so that the gas stream which flows through them into the cylinder forms a vortex. At low engine speeds, only one intake channel is open and other inlet channels open in succession. Because of the differences in cross-sectional area of the channels, the gas flow rate is greatest in the intake channel which opens first and becomes progressively smaller in the intake channels which open in succession. By means of variable interconnection of the channels, a higher maximum output with good torque characteristic is obtained as well as optimal fast combustion as a result of strong turbulence throughout the entire production of torque.
Abstract:
A method of providing a rocker arm set for a valvetrain includes providing a first intake rocker arm, a second intake rocker arm and a first exhaust rocker arm. The first intake rocker arm is configured as a switching rocker arm for a first intake valve on a first cylinder. The second intake rocker arm is for a second intake valve on a second cylinder. The second rocker arm is configured to operate in a normal Otto cycle mode. The first exhaust rocker arm is provided for a first exhaust valve on the second cylinder. The first intake rocker arm operates in one of an LIVC or EIVC mode where the first intake rocker arm is configured to open or close at a different time compared to the second intake valve. The first exhaust rocker arm operates in a cylinder deactivation mode.
Abstract:
An actuating mechanism for three inlet valves of a cylinder of an internal combustion engine has three first finger levers (6), each of which actuates an inlet valve (E) and is actuated by a cam (2, 3, 4) for a lower revolution speed range, and two second finger levers (9) which are arranged between neighbouring finger levers (6) and are actuated by their own identical cams (8) for the upper speed range. The first and second finger levers are coupled together in the upper speed range so that the valves are actuated in accordance with the contour of the cams (8).