Description
Functional positioning: One of the core precision components of the engine valve train, responsible for accurately transmitting the movement of the camshaft to the intake and exhaust valves and automatically eliminating valve clearance.
Ii. Main Functions and Working Principles
Transmitting motion and force: The tantler is installed in the seat hole of the cylinder head, with the bottom in direct contact with the CAM of the camshaft and the top in contact with the end of the valve stem. When the camshaft rotates, the profile of the CAM pushes the tappet to move up and down in a reciprocating motion, thereby precisely opening and closing the valves.
Automatic elimination of valve clearance (core function) :
Why eliminate the gap? When the engine is running, the parts will expand due to the increase in temperature. If there is no automatic compensation, the reserved mechanical clearance will become smaller or even disappear, resulting in the valves not closing tightly, or causing a huge "dada" abnormal noise and wear.
How to achieve it? 13750-0R020 is a type of hydraulic tappet. Its interior is a precise hydraulic structure, including a plunger, a small spring, a check valve and an oil chamber. It utilizes the oil pressure of the engine lubrication system to automatically fill or drain the oil chamber, thereby compensating for the minute clearances of the valve mechanism in real time and always maintaining a "zero clearance" state.
Advantages
Quiet operation: Fundamentally eliminates the noise generated by valve clearance.
Maintenance-free: There is no need to regularly check and adjust the valve clearance as with mechanical tappets.
Reduce impact wear: The hydraulic buffering effect reduces the impact and wear of the entire valve train components.
Iii. Structural and Material Characteristics
As an original factory precision part, its design and manufacturing requirements are extremely high:
Main material: Usually high-strength alloy steel is adopted to ensure the overall structural strength and durability.
The bottom working surface (in contact with the CAM) : This is the part that wears out the most severely. This surface undergoes special heat treatment and coating processes. Common techniques include laser cladding or phosphating treatment, forming an extremely hard and wear-resistant surface layer to withstand the high-speed friction and impact of the CAM.
The outer wall of the cylinder: The surface has undergone fine grinding and possibly smooth coating treatment to ensure smooth movement in the seat holes of the cylinder head, while maintaining an appropriate oil lubrication film to prevent jamming.
Internal hydraulic components: The internal plunger, check valve (usually a miniature steel ball), and spring are all made of high-precision and highly wear-resistant materials, ensuring long-term sealing and reliability in an oil environment.
