Collet chuck having parallel force loaded bearing

Details Collet chuck having parallel force loaded bearing Collet chuck having parallel force loaded bearing

B - Operations, Transporting

23

B

B23B 31/20 (2006.01)

Patent

CA 2196069

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.

Un mandrin de serrage (1), comportant un corps (3), une pince de serrage (11) placée dans le corps (3), une bague avant (23) comprimant radialement la pince (11), et un contre-écrou (30) déplaçant axialement la bague avant (23) pour que celle-ci applique une pression contre la pince (11), est pourvu d'un ensemble de roulements (45) placé entre la bague avant (23) et la pince (11) qui applique des forces compressives dans un sens parallèle à l'axe de rotation A du mandrin. Le contre-écrou (30) et la bague avant (23) comportent des sections à rebords (27, 43) qui font face à des surfaces opposées (47, 49) qui sont complémentaires par leur forme par rapport au profil sphérique des roulements à billes (50) et qui traversent une ligne L parallèle à l'axe de rotation A du mandrin. Le mandrin de serrage (10) comprend également des joints toriques d'étanchéité (61, 65) placés entre la bague avant (23) et le contre-écrou (30) à la fois devant et derrière des roulements à billes (50) afin de protéger l'ensemble paliers (45) de la poussière et des débris et de retenir le lubrifiant. Enfin, la partie de la bague avant (23), qui vient en coin contre la pince (11) afin de comprimer cette dernière vers l'intérieur, est pourvue d'une rainure (72) pour qu'elle s'adapte mieux entre la bague avant (23) et la pince (11), ce qui génère une force compressive radiale plus homogène autour de la pince (11), cette dernière offrant à son tour de meilleures caractéristiques de serrage.

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