| 摘要 |
<p>Bolts (11) are used to assemble a cylinder head and an engine block. The bolts (11) must be torqued to a preload tension. The tension often decays or relaxes after a time, thus reducing the firm fastening which is desired. A fastening tool (10, 10a) of this invention provides for the efficient and closely controlled imposition of a predetermined tension on a stud (13) while simultaneously applying a torque to a nut (15) to rotate and tighten it to maintain such tension. The fastening tool (10, 10a) comprises a housing (18, 18a) having a fluid-actuated piston (24, 24a) reciprocally mounted therein. The piston (24, 24a) is adapted for threaded attachment with the stud (13) to impose a predetermined tension thereon. </p> |
