| 摘要 |
<p>The heat dissipating apparatus includes a piston (2) having a valve pin locking hole (3) installed in a cylinder (1), with a piston bushing (5) fitted around the upper end of a valve pin (4). An outside guide bushing (10) is installed between a cylinder housing (8) and a manifold (9), with both a protrusion (11) and a groove (12) formed on the lower surface of the outside guide bushing (10). An inside guide bushing (13) is installed in the outside guide bushing (10) such that the head of the inside guide bushing protrudes outside the upper end of the outside guide bushing and is inserted into a locking hole (14) of the cylinder housing (8). During operation thereof, the pin guide bushing (5) thermally expands to come into close contact with the cylinder housing (8), thus eliminating the need for a conventional O-ring in the gap between the piston (2) and the cylinder housing (8).</p> |
