A hybrid drivetrain for a hybrid-drive vehicle, comprising:
- a transmission, which can be shifted by shifting elements into different transmission steps and which is connectable via an internal combustion engine shaft to an internal combustion engine, via an electric machine shaft to an electric machine, and via an output shaft to at least one vehicle axle, wherein the internal combustion engine shaft and a pinion shaft, which can be connected with respect to drive to the output shaft, are connectable via spur gearwheel sets, which can be shifted by shifting elements and which each form gear planes, of which at least one hybrid gear plane is additionally connectable to the electric machine shaft, wherein a further gear plane, which is free of attachments with respect to the electric machine shaft, directly adjoins the hybrid gear plane, wherein the hybrid gear plane and the further gear plane are components of a partial transmission having shifting elements, by which the partial transmission can be decoupled from the drivetrain during the transmission mode, wherein the hybrid gear plane includes a floating pinion-side gearwheel arranged on the pinion shaft, a drive-side gearwheel arranged on the internal combustion engine shaft, and an electric-machine-side gearwheel, and the electric-machine-side gearwheel is designed as a floating gearwheel and can be decoupled from the electric machine shaft or coupled thereto by means of the shifting element, wherein the further gear plane includes a pinion-side floating gearwheel, which is rotationally mounted on the pinion shaft and can be coupled by one of the shifting elements to the pinion shaft, and a first shifting element arranged on the pinion shaft can be shifted on both sides and is arranged in an axial direction between the pinion-side floating gearwheels, which are rotationally mounted on the pinion shaft, of the hybrid gear plane and the further gear plane, wherein the first shifting element is decoupled in a neutral position from the hybrid gear plane and the further gear plane and the first shifting element either couples the pinion-side floating gearwheel of the further gear plane to the pinion shaft in a first shifting position or couples the pinion-side floating gearwheel of the hybrid gear plane to the pinion shaft in a second shifting position wherein in the partial transmission, the further gear plane includes a drive-side floating gearwheel rotationally mounted on the internal combustion engine shaft, which can be coupled by a second shifting element to the internal combustion engine shaft, which are rotationally mounted on the internal combustion engine shaft, of the hybrid gear plane and the further gear plane are arranged in a rotationally-fixed manner on a pinion-side hollow shaft, which is coaxially rotationally mounted on the internal combustion engine shaft and can be coupled via precisely one shifting element to the internal combustion engine shaft.