This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Engine Valve Stem Seal II, Improved Lip with PTFE Layer for Oil Leakage Control
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 24, 1997 by SAE International in United States
Annotation ability available
It was presented in the previous paper (1) that oil leakage from valve stem seal (VSS) can be controlled by design and the characteristics of the newly designed composite VSS with a filled polyetrafluoroethylene (PTFE) layer lip are:
- a constant lower limit of oil leakage,
- minimal loss of power at low speed due to low friction,
- extended life over 300,000 km of vehicle traveled distance.
It was also reported that oil leakage for lubrication can be determined by the stress distribution across the seal lip contact width touching the valve stem under a certain interference. However, the variable pressure inside Intake and Exhaust ports of an engine will affect the stress distribution of the seal lip causing the change in oil leakage.
This report presents the design evaluation method and results of the improved VSS with filled PTFE layer lip which keeps the oil leakage constant even though the inside pressure of the engine port changes.
|Technical Paper||Finite Element Analysis of a Valve Stem Seal|
|Technical Paper||Experimental Study of Properties of Material for Reciprocating Valve Stem Seals|
|Technical Paper||The Use of FEA and DOE for PTFE Oil Seals Optimization|
CitationSilan, M., Seki, S., Goichi, M., Ohishi, T. et al., "Engine Valve Stem Seal II, Improved Lip with PTFE Layer for Oil Leakage Control," SAE Technical Paper 970548, 1997, https://doi.org/10.4271/970548.
- Goichi Mori Umeki Takashi Ueno Yoshinobu Ohishi Tetsu “Engine Valve Stem Seal, Oil Leakage Control Technology and Performance” SAE Paper 960208 Detroit, MI 1996
- Yasuo Esaki Ishiguro Tomoji Suzuki Noritomo Akada Masahiko “Mechanism of Intake-Valve Deposit Formation Part 1: Characterization of Deposits” SAE Paper 900151 Detroit, MI 1990
- Yoshihiro Nomura Ohsawa Katsuyuki Ishiguro Tomoji Nakada Asahiko “Mechanism of Intake-Valve Deposit Formation Part 2: Simulation Tests” SAE Paper 900152 Detroit, MI 1990