| 摘要 |
<p>PURPOSE: To obtain a high force feed efficiency by controlling the axial displacement of a seal member interposed in a plunger. CONSTITUTION: A plunger 14 is inserted in such a way that it can be slid within a cylinder 18 in the axial direction, and a cam 12 is provided while being brought into contact with one end of the plunger. A groove 28 in the circumferential direction is provided for the plunger 14, and a D ring and a Teflon ring are interposed in the groove 28. The width of the groove 28 shall be set at a value that a specified clearance is added to the total widths of the Teflon ring 22 and the D ring 24, with assemblage taken into consideration. In order to control the axial displacement of the D ring 24 as the plunger 24 is reciprocated, a projection 24a filling the clearance interspaced with the groove 28 is provided for the end section in the axial direction of the D ring 24.</p> |
