Modified rolled thread form for studs
First Claim
Patent Images
1. A stud for engaging a threaded hole in a cylinder liner having:
- a shank, an end, and a threaded section adjacent the end;
the threaded section having a plurality of full threads adjacent the shank and a plurality of axially extending relief zones extending from the full threads to the end for interrupting threads adjacent the end;
the full and partial threads having the same uniform major and pitch diameters and a minor diameter defining the smallest cross section of the threaded section; and
the relief zones lying outside the minor diameter of the threads.
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Accused Products
Abstract
A stud for securing a cylinder liner to a head has a modified thread form engaging a threaded hole in the stud with an interference fit. The thread is rolled and all threads have the same pitch diameter except the endmost thread. Three relief channels are formed in the threads and extend axially from the stud end through several threads while some full threads remain to engage the hole. The relief channels decrease hoop stress in the threaded hole and allow debris developed during installation to escape from the thread interface to prevent entrapment therein.
45 Citations
7 Claims
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1. A stud for engaging a threaded hole in a cylinder liner having:
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a shank, an end, and a threaded section adjacent the end; the threaded section having a plurality of full threads adjacent the shank and a plurality of axially extending relief zones extending from the full threads to the end for interrupting threads adjacent the end; the full and partial threads having the same uniform major and pitch diameters and a minor diameter defining the smallest cross section of the threaded section; and the relief zones lying outside the minor diameter of the threads.
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2. A stud for engaging a threaded hole with an interference fit having:
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a threaded end section with rolled threads, all of the threads except the endmost thread having a uniform major diameter and a uniform pitch diameter adapted for interference with the threaded hole; a plurality of interruptions in several threads nearest the end, the remaining threads being full threads; each interruption comprising a locally reduced maximum diameter of the several threads to a value less than the said pitch diameter to form a recess which is symmetrical with respect to a radial plane of the stud; and the minimum diameter of the stud in the threaded section being defined by the minor thread diameter, whereby the said recess is not deeper than the minor thread diameter. - View Dependent Claims (3, 4)
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5. A stud for engaging a threaded hole with an interference fit having:
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a threaded end section with rolled threads, all of the threads except the endmost thread having a uniform pitch diameter adapted for interference with the threaded hole, whereby debris is produced upon assembly of the stud to the threaded hole; means for receiving said debris to prevent entrapment of debris between the interfering threads comprising a plurality of channels axially extending through several threads adjacent the end and above the minor diameter of such threads; and each channel being symmetrical with respect to a radial plane of the stud. - View Dependent Claims (6, 7)
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Specification