Abstract:
The invention is a valve deactivator assembly (15) for use in connection with a valve train of an internal combustion engine. In application, a pre-selected number of the engine cylinders would each be equipped with a deactivator connected to its intake engine valve. Upon driver selection or predetermined road conditions, sufficient lost motion would be introduced into the valve train so that the valve would remain closed and the cylinder deactivated as the engine is in operation. The deactivator has in its inner body (19) a latch assembly that is in a latched condition for normal operation of the valve train. When it is desired to retain the valve in the closed position and deactivate a cylinder, the latch assembly is caused to be moved to the unlatched condition by increase in the pressure of the engine oil. When the latch assembly is unlatched, significant lost motion is introduced into the valve train causing the valve to remain closed and the cylinder is deactivated.
Abstract:
A roller finger follower (RFF) wherein the shaft of the roller bearing is restrained in the follower finger by the overhead cam. Ends of the shaft are positioned in place in the follower finger by notches formed in the side walls of the follower finger. The notches restrain the shaft from axial movement. The cam in position over the RFF keeps the shaft nested in the notches. Further restraining means are disclosed to keep the shaft loosely nested in the notches in the follower finger before the cam is installed in position.
Abstract:
A valve control system including a valve actuating camshaft (A), having a high lift cam (B) and a low lift cam (C), and an outer rocker arm (2) engaging the high lift cam, and an inner rocker arm (3) engaging the low lift cam. The ends of the rocker arms adjacent the engine poppet valve (V) are fixed to each other by a connector pin (37). The system includes a latching mechanism disposed at the ends of the rocker arms opposite the connector pin (37). Latching of the rocker arms is accomplished by a compound pin (8) moved between latched (FIG. 14A) and unlatched (FIG. 14B) conditions in response to movement of an actuator (9). The system also includes a rocker ratio varying device, such that, during operation in the low lift mode, the lift can be gradually increased, and gradually phase-shifted, as the engine speed increases.
Abstract:
In a valve operating system in an internal combustion engine, a swinging support section provided at a base end of a rocker arm is swingably carried on a rocker shaft mounted in a cylinder head. A plurality of valve abutments are provided at a tip end of the rocker arm and capable of being individually put into abutment against upper ends of a plurality of engine valves, and a cam abutment is provided on the rocker arm in an intermediate portion between the swinging support section and each of the valve abutments to come into contact with a valve operating cam. The swinging support section comprises a thinner cylindrical portion surrounding the rocker shaft, and thicker cylindrical portions which are formed at a thickness larger than that of the thinner cylindrical portion into a cylindrical shape to surround the rocker shaft and which are integrally and continuously provided at axially opposite ends of the thinner cylindrical portion, respectively. Thus, it is possible to enhance the durability of the rocker arm, while avoiding an increase in weight of the rocker arm.
Abstract:
In a valve operating system in an internal combustion engine, a swinging support section provided at a base end of a rocker arm is swingably carried on a rocker shaft, and tappet screws are threadedly fitted in a plurality of boss portions formed at a tip end of the rocker arm and arranged in a direction parallel to an axis of the rocker shaft, so that they can be individually put into abutment against upper ends of a plurality of engine valves. Cam abutments are provided on the rocker arm in an intermediate portion between the swinging support section and the boss portions to come into contact with a valve operating cam. The boss portions are interconnected by a connection wall having a plurality of wall portions which intersect each other in a plane perpendicular to the axis of the rocker shaft. Thus, the rigidity of the tip end of the rocker arm is enhanced sufficiently.
Abstract:
A switchable cam follower (1) of a valve train of an internal combustion engine, a stop means (19) extending between the axially relatively displaceable components, housing (2) and inner element (6), of the cam follower (1), a first component of the stop means (19) being a locking element (15) fixed in a reception (12) of the inner element (6), the locking element (15) extends radially outwardly into a slot (18) which is a further component of the stop means (19) and slot (18) has an upper end (20) which defines an upper end stop whereby the locking element (15) extends over a substantial part of half a length of the reception (12) in the inner element (6) and, at the same time, penetrates to the largest possible extent through the housing (2) in the region of the slot (18) which guarantees an excellent fixing of the locking element (15) in the housing (2) which is maintained through the entire life of the cam follower (1), and is further assured that component loading resulting from abutment is only slight.
Abstract:
A rocker arm (10) that reduces frictional forces between a cam (86) and the rocker arm (10) is disclosed. The rocker arm (10) includes a pair of spaced side members (20) having a valve portion (14), a middle portion (16), and a pivot portion (12). The side members (20) of rocker arm (10) each define a downwardly extending tappet hole (49) located generally centrally within the valve portion (14). The middle portion (16) of each side member (20) defines a bearing hole (68), and each of the pivot portions (12) defines a pivot hole (66). A web (70) extends between side members (20) at a valve portion (14) and at the pivot portion (12), defining a recess (85) therebetween at about the middle portion (16). A pin bearing is located within the bearing holes (68) and passes through the recess (85). An annular striking member (80) is located within the recess (85) and rotatably engages the pin bearing (69). During operation, a cam (86) is placed in operative contact with striking member (80). Rotation of cam (86) depresses striking member (80) and, in turn, rocker arm (10), while frictional forces from the cam cause the striking member (80) to rotate.
Abstract:
A device for actuating at least one load change valve of an internal combustion engine has at least one load change valve arranged in a cylinder head of an internal combustion engine wherein the load change valve has a valve shaft and a closing spring forcing the valve shaft into a closed position. A camshaft having cams is provided. Its axis of rotation is arranged such that it extends perpendicularly to a travel direction of the valve shaft. A transmission arrangement is positioned so as to be movable parallel to the travel direction of the valve shaft. It has a transverse member positioned between the camshaft and the valve shaft parallel to the camshaft and also has rollers positioned on the transverse member on opposite sides of the valve shaft. Each roller cooperates with one of the cams having identical contours. The cam movement of the cams is transmitted by the rollers onto the transverse member performing a linear movement, and the linear movement of the transverse member is transmitted onto the valve shaft. The transmission arrangement also has slides connected to opposed ends of the transverse member. The slides are moveably guided parallel to the travel direction of the valve shaft in the cylinder head.
Abstract:
A roller supporting device comprises a pair of supporting arms, a supporting shaft attached between the pair of supporting arms in a non-rotatable manner, and a roller having an inner hole in the central part thereof, the roller being disposed between the pair of supporting arms and being supported in a rotatable manner by the supporting shaft inserted through the inner hole, the roller being arranged to rotate along with the relative movement with a mating member by making the roller contact with the mating member, wherein a cut out portion, which extends in the axial direction on the outer circumferential surface of the supporting shaft, is formed at an appropriate portion except the portion on which the inner circumferential surface of the inner hole of the roller is pressed due to the load applied to the roller from the mating member, thereby defining an oil passage which extends in the axial direction between the supporting shaft and the inner circumferential surface of the inner hole of the roller.
Abstract:
A rocker arm (1) for the valve control of an internal combustion engine, in which the rocker arm is manufactured from stamped, deep drawn and subsequently heat treated, deep drawing sheet metal and characterized by the fact that the rocker arm (1) has opposite side pieces, in between a rolling element (10) is acommodated in a rotation position.