Speed changing apparatus

• Main Authors: SU, HSIN-YANG, LIN, SHIH-LIANG, TSAI, MINGIH
• Format: Patent
• Language: English; French; German
• Published: 25.04.2012
• Subjects: BLASTING; CYCLES; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; POWERED PROPULSION OF SLEDGES OR; RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; THERMAL INSULATION IN GENERAL; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES; TRANSPORTING; WEAPONS

A speed changing apparatus (1) comprises a planet gear set (11) including a sun gear (111), planet pinions (112), a planet pinion carrier (113) and a ring gear (114) mounted inside a rotary sleeve (14). The sun gear (111) is driven by a D.C. motor (2) to rotate in either of two opposed rotary directions. Clutch arrangements (12,13,141,142) are operative to lock one of either the carrier arm (113) or the ring gear (114) to a rotationally fixed component (10) and to drivingly couple the other of the carrier arm (113) and the ring gear (114) to the sleeve ring (14) depending on the direction of rotation of the motor (2). Different gear ratios are selected by reversing the direction of rotation of the motor (2) whilst the sleeve ring (14) is always driven in same direction. The speed change apparatus (1) may comprise part of a hub of an electric vehicle in which the sleeve ring (14) is a hub shell and the apparatus (1) is mounted about an axle (10).