Patent ID: 7887449

Claim:
A speed-change transmission apparatus comprising: a continuously variable speed-change device receiving a drive force from an engine; a planetary transmission section having a plurality of planetary transmission mechanisms for combining an output from the continuously variable speed-change device and a drive force from the engine which is not subjected to a speed-changing action by the continuously variable speed-change device; and a clutch section having a plurality of clutches and outputting a drive force from said planetary transmission section to an output shaft wherein said output shaft outputs an output having a rotational speed corresponding to a speed-change position of the continuously variable speed-change device and an operational condition of each clutch, as the continuously variable speed-change device is operated and as said each clutch is switched over between an engaged condition and a disengaged condition; wherein said each clutch of said clutch section comprises a meshing clutch including an input side rotational member for receiving the drive force from said planetary transmission section, an output side rotational member for outputting a drive force to said output shaft, and a clutch member; said clutch member is switchable between an engaged condition where said clutch member is engaged with said input side rotational member and said output side rotational member so as to operatively couple said input side rotational member and said output side rotational member of a corresponding clutch and a disengaged condition where said clutch member is disengaged from said input side rotational member or said output side rotational member so as to allow relative rotation between said input side rotational member and said output side rotational member; and said planetary transmission section includes a first planetary transmission mechanism having a sun gear receiving the output from said continuously variable speed-change device and a ring gear receiving the drive force of the engine not affected by the speed-changing function of said continuously variable speed-change device, a second planetary transmission mechanism having a planetary gear operatively coupled with a planetary of said first planetary transmission mechanism, and a common carrier for supporting the planetary gear of said first planetary transmission mechanism and the planetary gear of said second planetary transmission mechanism such that the planetary gear of said first planetary transmission mechanism and the planetary gear of said second planetary transmission mechanism are revolved in unison.