Description
I. Function and Role: Surpassing traditional rocker arms
This rocker arm is by no means an ordinary valve rocker arm; it is the core actuator of Audi's advanced valve train technology AVS (Audi Valvelift System). Its role goes far beyond transmitting power:
Realize variable valve lift: This is its most core function. The intake side of an engine is typically equipped with two different types of cams: the low-lift CAM (emphasizing fuel consumption and smoothness at low speeds) and the high-lift CAM (emphasizing power output at high speeds). The 06E109417E rocker arm is equipped with a switchable lock pin mechanism inside. Under the command of the electronic control unit, it can select which CAM to engage with, thereby changing the opening amplitude (lift) of the valve.
Automatic valve clearance compensation: It integrates the hydraulic tappet function, automatically eliminating valve clearance by utilizing engine oil pressure without the need for manual adjustment, ensuring that the engine always operates quietly.
Precise control of valve opening and closing: As the transmission medium between the camshaft and the valves, it ensures the accuracy of valve timing.
Ii. Installation Location and Working Environment
Location: Installed on the intake side of the engine cylinder head, with each intake valve corresponding to one. It is installed on the rocker shaft and sealed by the valve cover.
Working environment: Extremely demanding.
High-frequency and high-voltage impact: Withstand the continuous impact of thousands of revolutions per minute from the camshaft.
High temperature: Long-term immersion in high-temperature engine oil.
High-precision electronic control requirements: The internal solenoid valves and lock pins need to respond precisely within milliseconds.
Iii. Materials and Manufacturing Process: Ultimate precision
Due to the complexity of its functions, the requirements for materials and craftsmanship have reached the peak of industrial grade:
Main material: High-strength chromium-molybdenum alloy steel, formed through precision forging to ensure that the base material has extremely high strength and fatigue resistance.
Key contact surface: The sliding surface in contact with the camshaft is treated with salt bath nitriding or high-frequency induction hardening, featuring extremely high surface hardness (HV≥800), extreme wear resistance and low friction coefficient.
Hydraulic tongs assembly: The interior is a complex and precise structure, consisting of a low-carbon steel shell (carburized and quenched), alloy steel plungers, spring steel and a micro check valve, with processing accuracy at the micrometer level.
Switchable lock pin mechanism: This is the core for realizing the AVS function, controlled by solenoid valves, and has extremely strict requirements for the wear resistance and fit clearance of materials.
