Rocker arm control systems
Systems for valve actuation in internal combustion engines with a dedicated rocker for actuating the at least one of two or more engine valves in a braking operation may include a biasing component, such as a compression spring, tension spring, spring catch, hydraulic actuator, pneumatic actuator for biasing the dedicated rocker in a biased direction away from the motion source, and a limiting component, such as a physical stop including a set screw or a stop integrated in the biasing component, for limiting the motion of the dedicated rocker in the biased direction. The biasing component and limiting component maintain the dedicated rocker in a controlled state and a positive, neutral position during operation.
1. A system for actuating at least one of two or more engine valves in an internal combustion engine, the system comprising:
at least one dedicated rocker for actuating the at least one of two or more engine valves in an auxiliary operation;
a motion source for imparting motion to a motion source side of the dedicated rocker;
a motion receiving component for receiving motion from a motion receiving component side of the dedicated rocker; and
a rocker motion control assembly for controlling motion of the dedicated rocker, the rocker motion control assembly comprising:
a biasing component for biasing the dedicated rocker in a biased direction such that the motion source side of the dedicated rocker tends to move away from the motion source; and
a limiting component for limiting the motion of the dedicated rocker in the biased direction, the limiting component defining a positive stop adapted to be engaged by the dedicated rocker.
2. The system of claim 1 , wherein the biasing component is adapted to apply a biasing force on the motion receiving component side of the dedicated rocker.
3. The system of claim 2 , wherein the biasing component includes a spring adapted to engage a surface on the dedicated rocker.
4. The system of claim 1 , wherein the limiting component is adapted to engage the motion source side of the dedicated rocker.
5. The system of claim 4 , wherein the limiting component is an adjustable stop.
6. The system of claim 1 , wherein the biasing component is adapted to apply a biasing force on the motion source side of the dedicated rocker.
7. The system of claim 1 , wherein the biasing component includes a pin secured to the rocker and a spring adapted to apply a biasing force to the pin.
8. The system of claim 7 , wherein the pin extends within a pin guide for guiding the pin for sliding movement relative thereto.
9. The system of claim 8 , wherein limiting component includes a shoulder on the pin for limiting movement of the pin relative to the guide.
10. The system of claim 1 , further comprising a main event rocker for conveying main event valve motion, wherein the biasing component is cooperatively associated with the main event rocker.
11. The system of claim 10 , wherein the biasing component comprises a spring disposed between the main event rocker and the dedicated rocker.
12. The system of claim 1 , further comprising a main event rocker for conveying main event valve motion, wherein the limiting component comprises a stop on the dedicated rocker adapted to engage the main event rocker.
13. The system of claim 1 , further comprising a main event rocker for conveying main event valve motion, wherein the limiting component comprises a first stop on the dedicated rocker adapted to engage a second stop on the main event rocker.
14. The system of claim 1 , wherein the rocker motion control assembly includes a biasing assembly for biasing the rocker towards a neutral position in which the rocker motion source side is out of engagement with the motion source and the rocker motion receiving component side is out of engagement with the motion receiving component.
15. The system of claim 1 , wherein the dedicated rocker is adapted to move within a range of motion defined by the motion source and the limiting component and wherein the biasing component is arranged to apply a continuous biasing force to the dedicated rocker throughout the range of motion.
16. The system of claim 1 , wherein the dedicated rocker is adapted to move on a rocker shaft and wherein the limiting component includes a rocker engagement surface that remains in a fixed position relative to the motion of the rocker.
17. The system of claim 1 , wherein the biasing component comprises a hydraulic piston.
18. The system of claim 1 , further comprising a rocker shaft, wherein the biasing component comprises a torsion spring situated around the rocker shaft.
19. The system of claim 1 , wherein the biasing component comprises a spring disposed between a support plate, fixed relative to an engine cylinder head, and a spring retainer supported on a retaining flange secured to the end of a fastener extending through the support plate.
20. A system for actuating at least one of two or more engine valves in an internal combustion engine, the system comprising:
at least one dedicated rocker for actuating the at least one of two or more engine valves in an auxiliary operation;
a motion source for imparting motion to a motion source side of the dedicated rocker;
a motion receiving component for receiving motion from a motion receiving component side of the dedicated rocker; and
a rocker motion control assembly for controlling motion of the dedicated rocker, the rocker motion control assembly comprising:
a biasing component arranged to apply a continuous biasing force to the dedicated rocker in a biased direction, the biasing force tending to move the motion source side of the dedicated rocker away from the motion source; and
a limiting component for engaging the dedicated rocker and thereby limiting the motion of the dedicated rocker in the biased direction,
wherein the biasing component and limiting component cooperate with the dedicated rocker to maintain the dedicated rocker in a positively defined position when the dedicated rocker is not engaged with the motion source.