Gear shifting device, transmission mechanism, and wind turbine generator system

A gearbox, comprising a first planetary gear train, wherein the first planetary gear train comprises a first ring gear, a first planet carrier, a first planetary gear, a sun idle gear and a planetary idle gear;

• the planetary idle gear and the first planetary gear both mounted to the first planet carrier;
• the first planetary gear comprises a pinion and a bull gear;
• the planetary idle gear and the pinion are both internally engaged with the first ring gear and both externally engaged with the sun idle gear;
• the pinion is radially floatable relative to the first planet carrier;
• the gearbox is further provided with an input shaft, and one end of the input shaft is connected to the first ring gear or the sun idle gear,
• wherein a first bearing is provided between the first planetary gear and the first planet carrier,
• wherein the first planet carrier comprises a base and a bottom plate located at one end of the base, wherein the bottom plate and the base are connected or integrated with each other, the base is provided with a base plate, the base plate and the bottom plate opposite to each other and form a first receiving space therebetween for receiving the bull gear, and the first bearing is provided between the bull gear and the base plate and/or the bottom plate.

A gearbox, comprising a first planetary gear train, wherein the first planetary gear train comprises a first ring gear, a first planet carrier, a first planetary gear, a sun idle gear and a planetary idle gear;

• the planetary idle gear and the first planetary gear both mounted to the first planet carrier;
• the first planetary gear comprises a pinion and a bull gear;
• the planetary idle gear and the pinion are both internally engaged with the first ring gear and both externally engaged with the sun idle gear;
• the pinion is radially floatable relative to the first planet carrier;
• the gearbox is further provided with an input shaft, and one end of the input shaft is connected to the first ring gear or the sun idle gear,
• wherein the first planetary gear train further comprises a first sun gear,
• wherein the gearbox further comprises one or more stages of second planetary gear train, the second planetary gear train comprises a second ring gear, a second planet carrier, a second planetary gear and a second sun gear, the second planetary gear is mounted to the second planet carrier, and the second planetary gear is internally engaged with the second ring gear and externally engaged with the second sun gear;
• and the second planet carrier is in transmission connection with the first sun gear or the second sun gear of a previous stage,
• wherein the second planet carrier comprises two mounting plates spaced apart along the axial direction, and a receiving space for receiving the second planetary gear is formed between the two mounting plates, wherein the second planetary gear is mounted on a second planetary gear shaft, a third bearing is provided between the second planetary gear and the second planetary gear shaft, and two ends of the second planetary gear shaft are respectively connected to the two mounting plates.