Patent ID: 8047942
Filing Date: 2011-11-01
Classification: B60K,F16H

Abstract:
1. A speed change transmission apparatus comprising: a hydrostatic stepless speed change section having a hydraulic pump and a hydraulic motor and receiving an output of an engine via a pump shaft; a planetary transmission section having a plurality of planetary transmission mechanisms and a plurality of output members, the planetary transmission section being configured to combine a drive force outputted from the hydrostatic stepless speed change section and an engine drive force that has not been subjected to any speed change action by the hydrostatic stepless speed change section; and a speed change output section having a single output shaft, the speed change output section being configured to output combined drives force outputted from the plurality of output members in a plurality of different speed ranges from the output shaft; wherein the engine, the hydrostatic stepless speed change section, and the planetary transmission section are provided in the stated sequence from an upstream side in a drive force transmitting direction; wherein a power takeoff shaft is operatively coupled with the pump shaft which extends through the hydraulic pump, and the engine drive force that has not been subjected to any speed change action by the hydrostatic stepless speed change section is transmitted to said planetary transmission section via the power takeoff shaft; wherein said speed change output section includes a plurality of transmission mechanisms disposed between said plurality of output members and said output shaft, and a clutch provided for each of the plurality of transmission mechanisms; and each of the plurality of transmission mechanisms includes an input gear provided at the output member associated therewith, and an output gear mounted on the single output shaft and meshed with the input gear.