MEJORAS EN MECANISMO DE CONTROL DE CAMBIOS DE VELOCIDAD DE UNA TRANSMISION MANUAL PARA AUTOMOVILES

In an automotive manual transmission comprising a common fork shaft on and along which a plurality of shift forks are slidable, a control rod (94) rotatable about and slidable along the axis thereof which is normal to the axis of the common fork shaft, a pivoting pin (90) extending normal to both the axes of the common fork shaft and the control rod, a plurality of pivoting levers (82) pivotally mounted on the pivoting pin (90) and jointly engaged at their one ends with the corresponding shift forks, a selecting head member (110) secured to the control rod (94) and engageable with the other end of selected one of the pivoting levers (82) when the control rod (94) is rotated about its axis, an interlock plate (106) rotatably mounted on the control rod (94) to ensure that only the selected pivoting lever (82) is rotatable at any given time, and a supporting member (92) removably connected to the transmission housing (12, 14) and having mounted thereon the pivoting pin (90), there is proposed a positioning arrangement in which the supporting member (92) is provided with at least one positioning means (92e, 92f) which is, when the supporting member is mounted to the transmission housing (12, 14), brought into a locking engagement with a partner positioning means (98, 102) provided at the transmission housing (12, 14).