| 摘要 |
A lash adjuster is provided in which the friction coefficient between the pressure flanks is less likely to decrease over a long time use. The lash adjuster 1 includes a nut member 10 having an internal thread 17 on its inner periphery, an adjusting screw 11 having an external thread 18 on its outer periphery which is in threaded engagement with the internal thread 17, and a return spring 12 biasing the adjusting screw 11 in a direction to protrude from the nut member 10, the external thread 18 and the internal thread 17 having pressure flanks 19 and 21, respectively, for receiving an axial load that tends to push the adjusting screw 11 into the nut member 10, wherein a satin finished surface is formed on the pressure flank 19 of the external thread 18, and the satin finished surface has a higher surface hardness than the pressure flank 21 of the internal thread 17.
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