Experimental evaluation of tappet/bore and cam/tappet friction for a direct acting bucket tappet valvetrain
Conference
·
OSTI ID:5936216
This paper reports on tappet/bore friction and torque at the camshaft that were measured for a direct acting bucket tappet using a cam/tappet friction torque and friction coefficient as a function of cam angle were derived from those measurements. The results showed that, for the particular geometry tested, tappet/bore friction torque accounted for about 13% of the total cam/tappet/bore friction torque at 250 cam rpm. This fraction decreased with increasing speed. Tappet bore friction was greatest at about {plus minus}40 degrees of cam angle, where side loads on the tappet bore were highest. In contrast, earlier results for a center pivot rocker arm design showed tappet bore friction to be negligible.
- OSTI ID:
- 5936216
- Report Number(s):
- CONF-9010205--
- Country of Publication:
- United States
- Language:
- English
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