| 摘要 |
A collet chuck (1) having a chuck body (3), a collet (11) disposed in the body (3), a nose ring (23) for radially compressing the collet (11), and a locknut (30) for axially moving the nose ring (23) into compressive engagement with the collet (11) is provided with a bearing assembly (45) disposed between the nose ring (23) and the collet (11) which loads compressive forces in a direction which is advantageously parallel to the axis of rotation (A) of the chuck. Both the locknut (30) and the nose ring (23) include flange portions (27, 43) that confront each other with opposing surfaces (47, 49) that are complementary in shape to the spherical profile of the ball bearings (50) and which traverse a line (L) parallel to the axis of rotation (A) of the chuck. The collet chuck (1) further includes O-rings (61, 65) disposed between the nose ring (23) and the locknut (30) both in front of and behind the ball bearings (50) for sealing the bearing assembly (45) against dust and debris and retaining lubricant. Finally, the portion of the nose ring (23) which wedgingly engages the collet (11) to compress it inwardly is undercut with a groove (72) in order to enhance the compliance between the nose ring (23) and the collet (11), thus providing a more uniform radial compressive force around the collet (11) which in turn results in improved gripping characteristics. |
