Schaeffler North America

Components with hydraulic valve lash adjustment

Roller type rocker arm with hydr. valve lash adjustment


The main body of the roller type rocker arm is preferably made from aluminium or steel; it is fitted with:

  • a pin
  • a needle bearing cam roller
  • a hydraulic insert element


  • Very low valve train friction
  • Very little space is required, since all the valves can be activated by a single camshaft

Special designs of rocker arm allow activation of 1, 2 or 3 valves. Each valve contact has one insert element which hydraulically adjusts the valve lash of each valve.


Hydraulic insert element with contact pad

  • The contact pad made from hardened steel
  • Supported with a swivel facility on the insert element by means of a ball/socket joint
  • Very low contact pressures in the cam contact area
  • Advantages of hydraulic valve lash adjustment correspond to those of the tappet