Duplex sprocket/gear construction and method of making same

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 55/06 (2006.01) B22F 5/08 (2006.01) F16H 55/30 (2006.01)

Patent

CA 2240426

A unitary powder metal gear or sprocket (10) has a teeth region (16) which extends 2-5 mm below the tooth root diameter and a body region (14) radially inside of the teeth region (16). The teeth region (16) is pressed to a higher density than the body region (14) in a two chamber compaction die. The teeth region (16) is made of a sinter or induction hardening material, and the body region (14) is made of a liquid phase sintered material. Materials for the teeth (16) and body (14) regions are selected for compatibility by compacting them into a bimetallic strip (20, 22) with the teeth material (18) on one side and the body material (19) on the other side, sintering the strip (20,22) and observing the amount it bends.

Cette denture de pignon ou cet engrenage (10), fabriqué d'un seul tenant à partir de poudres métalliques, comprend une denture (16) atteignant 2 à 5 mm au-dessous du diamètre correspondant au bas des dents, et un corps (14) disposé dans le rayon de cette denture (16), laquelle est comprimée à une densité supérieure à celle du corps (14) dans une filière de compression à deux chambres. Cette denture (16) est fabriquée par frittage ou trempe par induction d'un matériau, et le corps (14) l'est par frittage d'un matériau en présence de phase liquide. Les matériaux de la denture (16) et du corps (14) sont choisis pour leur compatibilité au compactage en une barre bimétallique (20, 22), le matériau de denture (18) étant placé d'un côté et celui du corps (19) de l'autre côté, après quoi on procède au frittage de cette barre (20, 22) et on observe son degré de fléchissement.

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