TOOL ADAPTER

摘要

In this traction drive tool adapter, a rotary portion (A) has an inner housing (1) at its front half with bores (5) for the insertion of planetary rollers (7), extending radially from the outer circumferential surface of the housing into a central bore (4) therein. Each of the roller-inserting bores (5) has grooves (6,Fig. 2) for the drive pins (8) of the planetary rollers (7), these grooves continuing from the two axially opposite ends of the roller-inserting bore. Each drive pin (8) with its planetary roller (7) may thus be set into the front half of the rotary portion (A) by inserting the planetary roller (7) from radially outside, the ends of the pins (8) fitting into the shaft-member-setting grooves (6). The rotary portion (A) can therefore be in one piece. The outer circumferential section of each planetary roller (7) is engaged with an annular fixed track (32) in a fixed portion (30) of the adapter and the outer circumferential section of a sun roller (52) on the tool mount portion (50) of the adapter. A thread (24a) may be provided in a through bore (24) extending from the rear end of the rotary portion (A) to the central bore (4) in the axial direction, with a screw (25) engaged with the thread. This assists removal of the tool mount (50). Labyrinth seals (18,35,53) may be provided at the outer ends of the relative rotary regions between the fixed, rotary and tool mount portions, with elastic contact lip-carrying rings (19,20,21) fitted on the inner side of the labyrinth seals.