Patent ID: 7217212
Filing Date: 2007-05-15
Classification: F16H

Abstract:
1. A differential gear system, comprising: a casing; a hollow gear with inner teeth rotatably mounted in said casing to rotate about a central axis; a wheel shaft rotatably mounted in said casing to rotate about said central axis; a dual-axis coupling having a first axis parallel to a second axis, said dual-axis coupling attached to said wheel shaft such that said first axis is aligned with said central axis; a stably-oriented orbiting inner gear with outer teeth, said outer teeth in meshing engagement with said inner teeth of said hollow gear, said dual-axis coupling rotatably mounted in said stably-oriented orbiting inner gear such that said stably-oriented orbiting inner gear rotates about said second axis of said dual-axis coupling, wherein said stably-oriented orbiting inner gear is supported by said dual-axis coupling to orbit about said central axis, and wherein said casing is rotatably mounted to rotate about said central axis; and a passive dual-axis coupling having a gear axis parallel to a support axis, said passive dual-axis coupling rotatably mounted in said stably-oriented orbiting inner gear to rotate about said gear axis, wherein said stably-oriented orbiting inner gear is supported by said passive dual-axis coupling.