Apparatus and method for engaging components through thermal...

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 31/20 (2006.01) B23P 11/02 (2006.01) B23P 19/06 (2006.01) F16B 39/30 (2006.01)

Patent

CA 2647028

A bushing (50) has an externally threaded portion (52) with a thread pitch P1. A collet body (20) has an internally threaded portion (31) with a thread pitch P2, which is smaller than P1 by a pitch differential, .DELTA.P. To assembly the bushing (50) and collet body (20), the collet body is heated relative to the bushing to reduce the .DELTA.P. The threaded portions (52, 31) of the bushing and collet body are then threadingly engaged with each other. The temperature of the bushing (50) and collet body (20) are then equalized, which tends to increase the .DELTA.P, which causes the threaded portions (52, 31) to bind with each other and resist relative loosening rotation. The threaded portions (52, 31) may additionally/alternatively be reverse tapered and/or include variable thread pitches that cause the threaded portions to further bind with each other.

La présente invention concerne une douille présentant une portion à filetage extérieur avec un pas de vis P1. Un corps de mandrin présente une portion à filetage intérieur avec un pas de vis P2 qui est inférieur à P1 d'un différentiel de pas .DELTA.P. Pour assembler la douille et le corps de mandrin, le corps de mandrin est chauffé relativement à la douille pour réduire .DELTA.P. Les portions filetées de la douille et du corps de mandrin sont alors engagés par filetage l'une à l'autre. La douille et le corps de mandrin sont alors amenés à une même température, ce qui tend à augmenter .DELTA.P de sorte que les portions filetées sont en prise l'une avec l'autre et résistent au desserrage relatif par rotation. Les portions filetées peuvent en outre/en variante présenter une conicité arrière et/ou présenter des pas de vis variables permettant aux portions filetées d'être davantage en prise l'une avec l'autre.

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