Shift control mechanism of an automotive manual transmission

Claim 1

In a shift control mechanism of an automotive manual transmission including shift forks slidable along a fork shaft for shifting corresponding coupling sleeves, a control rod rotatable about and slidable along the axis thereof which is normal to the axis of said fork shaft, a pivoting pin extending normal to both the axes of said fork shaft and said control rod, at least one pivoting lever pivotally mounted on said pivoting pin and jointly engaged at one end thereof with an associated shift fork to induce, upon rotation about the pivoting pin, a sliding movement of the associated shift fork along the fork shaft, a selecting head member secured to said control rod to be movable therewith, said head member being engageable with the other end of said pivoting lever when said control rod rotates about the axis thereof into a certain angular position, an interlock plate mounted on said control rod for rotation therewith to ensure that only the selected pivoting lever is rotatable at any given time, means for temporarily restraining said control rod in one longitudinal position thereof, said means including longitudinally spaced notches formed on said control rod and an engaging member biased to slidably engage with said notches, said engaging member being received in a hole formed in the transmission housing, and a supporting member removably secured to said transmission housing and having mounted thereon said pivoting pin, a positioning arrangement for positioning parts of said transmission relative to the transmission housing, said arrangement comprising: a first projection formed on said supporting member, said projection being tightly received in a hole of said transmission housing; a second projection formed on one of said supporting member and said transmission housing; and said second projection being tightly received in another hole formed in the other of said supporting member and said transmission housing, whereby when said first and second projections are both tightly received in the corresponding holes, displacement of said supporting member relative to said transmission housing in a direction normal to the axes of said first and second projections is prevented.