In order to clarify the friction and wear mechanism of the contact between cam and follower in the valve train incorporated with ERG system, an experimental investigation was performed with a cam-follower test rig. A fresh CD-level SAE10W30 multi-grade oil and its deteriorated versions with different contaminants were tested. Changes in friction force and amount of wear were measured during the course of the tests. The influence of the soot in the deteriorated oil was examined by mixing the exhaust gas soot blended with the dispersant and ZnDTP and/or MoDTC additives. Results are summarized as follows. (1) The friction fluctuated and gradually increased with the lapse of time in case of contaminated oils with the soot. (2) Under the coexistence of ZnDTP and MoDTC, however, it became a gradual decrease lower in friction. (3) The soot dispersed in the oil increased wear rate by reducing the anti-wear effect of the ZnDTP. (4) The wear rate became the lowest under the soot contamination as if the anti-wear effect was kept due to the MoDTC.
Friction and wear characteristics for cam and follower influenced by soot contamination
Reibungs- und Verschleißkennwerte für rußkontaminierte Kipphebel und Stößel
2001
6 Seiten, 7 Bilder, 15 Quellen
Aufsatz (Konferenz)
Englisch
Additiv , Kipphebel , Kontamination , Ölschmierung , Prüfverfahren , Reibkraft , Reibung , Ruß , Stößel (Ventil) , Tribologie , Ventilsteuerung , Verschleiß , Viskosität
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