| 摘要 |
<p>The hydraulic direct-acting bucket tappet for internal combustion engines comprises: a body (10) formed by a cylindrical element which is open at its upper end and closed at its lower end by a base or bottom (12); a plunger (20) whose lower portion (24) has an inwardly directed shoulder (25) provided for holding an helical spring (30); a plastic molded insert (40) housed into said plunger (20), a diametrical portion (400) of said insert being provided with a seat (48) having the shape of a sector of a cylinder transversally arranged with respect to the direction of extension of said diametrical portion (400); a roller (60), provided for contacting a cam of the cam shaft, made of hardened steel which is housed and retained within said seat (48) suitable to realize a condition of rolling friction between the cam shaft of the engine and the bucket. <IMAGE></p> |
