Patent ID: 6367321
Filing Date: 2002-04-09
Classification: F01L,G01N

Abstract:
A method for testing the strength of a ceramic engine-valve comprising an umbrella-shaped head portion at one end and a bar-shaped stem portion which extends to the opposing end of the valve, the end portion of the bar-shaped stem portion having a cotter-groove portion near the end of the end portion and a cotter-fastening portion on the end portion of the stem portion which is closer to the umbrella-shaped head portion than the cotter-groove portion, said method comprising the steps of:fastening and holding only the cotter-fastening portion to be fastened by a cotter to one end portion of a main spindle connected to a rotational driving system coaxially with the main spindle; rotatably holding the stem portion at a position separated from the cotter-fastening portion being held by a predetermined span; and applying a load in a direction perpendicular to the stem portion axis at the position on the stem portion separated from the cotter-fastening portion being held by the predetermined span while the valve is rotated about the axial line thereof by rotating the main spindle so as to test the strength of the cotter-fastening portion.