| 摘要 |
A hydraulic lash adjuster ( 17;61;81 ) in which the body ( 19 ) defines a body bore ( 39 ) extending over substantially the entire axial length of the body, thus making it possible to finish the bore ( 39 ) by a more accurate process, such as honing. In the FIG. 2 embodiment, there is a cylindrical member ( 71 ) disposed in the lower portion of the body bore ( 39 ) cooperating to define a leakdown clearance ( 39,71 S), to isolate side load on the plunger ( 25 ) the leakdown. In the FIG. 3 embodiment, there is both the leakdown clearance ( 23 S, 39 ) between the body bore and the plunger ( 23 ) and the leakdown clearance ( 39,71 S) between the body bore and the cylindrical member ( 71 ), the leakdown flow rate of FIG. 3 being variable if the body and the cylindrical member ( 71 ) comprise dissimilar metals, having different coefficients of thermal expansion.
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