| 摘要 |
PURPOSE:To enable evaluation of sliding condition between a cylinder liner and a piston cylinder during actual operation, by building up a part of the cylinder liner serving as a desired ultrasonic wave path out of a material with a better ultrasonic transmissivity. CONSTITUTION:A material 31 with a better untrasonic transmissivity such as steel is inserted securely into a cylinderliner 3 made of cast iron to be molded and wrought as one-piece cylinder liner. Then, ultrasonic wave transmitting and receiving elements 71 and 81 are mounted on the portion of the material 31, an ultrasonic wave is beamed through the inner surface of the cylinder toward a sliding surface from the transmitting element 71 and the ultrasonic wave reflected from the sliding surface is received with the receiving element 81. Unlike the cylinder made of the cast ion only, the better ultrasonic transmissivity thereof achieves a higher ultrasonic detection accuracy, thereby facilitating the evaluation of lubricating condition of the sliding surface. It also should be noted that tapering in the shape of the material as illustrated can reduce effect of delayed echoes reflected back from the circumferential surface thereof, thereby allowing further improvement in the accuracy.
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