| 摘要 |
Tension (slack, sag or free play) in a span of a flexible member (e.g. motorcycle transmission chain or belt drive; cable, rope or tie-rod) is measured by sequentially applying increasing deflection forces to the member in two opposite directions perpendicular to its lengthwise axis; detecting when each force attains a pre-defined magnitude; electronically measuring the corresponding deflections; and calculating a function of these two distances (e.g. their absolute difference). Apparatus may include input (13, Fig. 1) and jaws 8 (comprising deflectors (6, 7, Fig. 1), compression spring (9, Fig. 1)) mounted to a fixed base (1, Fig.1) for movement along a common axis such that forward and reverse axial forces at the input act on the member via the deflectors. Deflection force sensors (18, 19, Fig. 1) may comprise micro-switches. Deflection distances may be measured by linear potentiometer (11, Fig. 3), LVDT, ultra-sonic or laser distance transducer. |
