CYLINDER DEACTIVATION AND ENGINE BRAKE MECHANISM FOR TYPE III CENTER PIVOT VALVETRAINS

Information

  • Patent Application
  • 20230296036
  • Publication Number
    20230296036
  • Date Filed
    May 17, 2023
    a year ago
  • Date Published
    September 21, 2023
    a year ago
Abstract
A rocker assembly for a type III center pivot valvetrain comprises a rocker arm having a cam end, a center pivot bore, and a valve end which includes a first actuator bore and a second actuator bore. The rocker assembly further comprises a a cylinder deactivation actuator arranged in the first actuator bore. The cylinder deactivation actuator comprises a hydraulically actuated latch assembly configured to selectively switch between a latched configuration and an unlatched configuration and a a mechanical lash-setting sleeve distanced from a travel stop defined within the first actuator bore. The cylinder deactivation actuator further comprises a lash step disposed below the mechanical lash-setting sleeve and extending into the first actuator bore. The hydraulically actuated latch assembly is configured to selectively travel between the travel stop and the lash step when the hydraulically actuated latch assembly is in the latched configuration.
Description
Claims
  • 1. A rocker assembly for a type III center pivot valvetrain, the rocker assembly comprising: a rocker arm comprising a cam end, a center pivot bore, and a valve end which includes a first actuator bore and a second actuator bore;a cylinder deactivation actuator arranged in the first actuator bore, the cylinder deactivation actuator comprising: a hydraulically actuated latch assembly configured to selectively switch between a latched configuration and an unlatched configuration;a mechanical lash-setting sleeve distanced from a travel stop defined within the first actuator bore; anda lash step disposed below the mechanical lash-setting sleeve and extending into the first actuator bore; andan engine brake actuator arranged in the second actuator bore,wherein the hydraulically actuated latch assembly is further configured to selectively travel between the travel stop and the lash step when the hydraulically actuated latch assembly is in the latched configuration.
  • 2. The rocker assembly of claim 1, further comprising a first hydraulic port connected from the center pivot bore to the first actuator bore and a second hydraulic port connected from the center pivot bore to the second actuator bore.
  • 3. The rocker assembly of claim 2, wherein the engine brake actuator comprises a castellation assembly configured to selectively switch between a lost motion state and a solid state.
  • 4. The rocker assembly of claim 1, further comprising a spring biasing a plunger in a direction out of the mechanical lash-setting sleeve, wherein the hydraulically actuated latch assembly is seated in the plunger.
  • 5. The rocker assembly of claim 1, wherein the hydraulically actuated latch assembly is further configured to selectively travel between the travel stop, past the lash step, and into the mechanical lash-setting sleeve when the hydraulically actuated latch assembly is in the unlatched configuration.
  • 6. The rocker assembly of claim 1, wherein the engine brake actuator comprises a castellation assembly configured to selectively switch between a lost motion state and a solid state, and wherein the hydraulically actuated latch assembly is further configured be in the latched configuration when the castellation assembly is in the lost motion state.
  • 7. The rocker assembly of claim 1, wherein the engine brake actuator comprises a castellation assembly configured to selectively switch between a lost motion state and a solid state and wherein the hydraulically actuated latch assembly is further configured to abut the lash step when the hydraulically actuated latch assembly is in the latched configuration and the castellation assembly is in the solid state.
  • 8. A valve assembly, comprising: the rocker assembly of claim 7;a valve bridge;a first valve coupled to the valve bridge; anda second valve coupled to a cleat in a pass-through opening of the valve bridge,wherein the engine brake actuator is configured to impart an engine braking function to the second valve via the cleat when the castellation assembly is in the solid state, andwherein the cylinder deactivation actuator is configured to impart a main lift function to the first valve and the second valve via the valve bridge when the hydraulically actuated latch assembly is in the latched configuration.
  • 9. A valve assembly, comprising: the rocker assembly of claim 6;a valve bridge;a first valve coupled to the valve bridge; anda second valve coupled to a cleat in a pass-through opening of the valve bridge,wherein the cylinder deactivation actuator is configured to impart a main lift function to the first valve and the second valve via the valve bridge when the castellation assembly is in the lost motion state and the hydraulically actuated latch assembly is in the latched configuration.
  • 10. A valve assembly comprising: the rocker assembly of claim 5;a valve bridge;a first valve coupled to the valve bridge; anda second valve coupled to a cleat in a pass-through opening of the valve bridge,wherein the engine brake actuator is coupled to the second valve via the cleat, the engine brake actuator comprising a castellation assembly configured to selectively switch between a lost motion state and a solid state, andwherein no valve lift is transferred to the first valve or to the second valve when the hydraulically actuated latch assembly is in the unlatched configuration and the castellation assembly is in the lost motion state.
Priority Claims (1)
Number Date Country Kind
201911024473 Jun 2019 IN national
Continuations (1)
Number Date Country
Parent 17620510 Dec 2021 US
Child 18318884 US