Provided is a planetary geared reducer with a dual reduction ratio. The reducer includes: a housing provided with a ring gear, and having one side where an input shaft is rotatably inserted and an opposite side where an output shaft is rotatably inserted; a sun gear provided at the input shaft; at least one planetary gear engaged between the sun gear and the ring gear; and a high reduction carrier provided at the output shaft to rotatably support the planetary gear by a rotation pin, wherein the high reduction carrier is coupled with a low reduction carrier, the low reduction carrier has a through-hole where the sun gear passes, the through-hole has a low reduction gear engaged with the sun gear, and the sun gear is selectively interlocked with the planetary or low reduction gear according to a forward or rearward movement of the input shaft to perform dual reduction.

Provided is a planetary geared reducer with a dual reduction ratio. The reducer includes: a housing provided with a ring gear, and having one side where an input shaft is rotatably inserted and an opposite side where an output shaft is rotatably inserted; a sun gear provided at the input shaft; at least one planetary gear engaged between the sun gear and the ring gear; and a high reduction carrier provided at the output shaft to rotatably support the planetary gear by a rotation pin, wherein the high reduction carrier is coupled with a low reduction carrier, the low reduction carrier has a through-hole where the sun gear passes, the through-hole has a low reduction gear engaged with the sun gear, and the sun gear is selectively interlocked with the planetary or low reduction gear according to a forward or rearward movement of the input shaft to perform dual reduction.

A two-speed transmission for an electric vehicle includes a planetary gear set selectively coupling an input shaft and an output shaft. The planetary gear set is configured to provide two forward gear ratios and neutral. The planetary gear set includes at least one sun gear, at least one pinion in meshing engagement with the at least one sun gear, at least one ring gear meshingly engaged with the at least one pinion, and a carrier. The carrier supports the at least one pinion and is connected to the output shaft such that rotation of the carrier drives the output shaft. The two-speed transmission also includes one or more elements that rotatably couple the at least sun gear, the at least one pinion, the at least one ring gear, the input shaft, and the carrier with one another and/or a ground. Examples of such elements include clutches, brakes, and mechanical diodes.

A two-speed transmission for an electric vehicle includes a planetary gear set selectively coupling an input shaft and an output shaft. The planetary gear set is configured to provide two forward gear ratios and neutral. The planetary gear set includes at least one sun gear, at least one pinion in meshing engagement with the at least one sun gear, at least one ring gear meshingly engaged with the at least one pinion, and a carrier. The carrier supports the at least one pinion and is connected to the output shaft such that rotation of the carrier drives the output shaft. The two-speed transmission also includes one or more elements that rotatably couple the at least sun gear, the at least one pinion, the at least one ring gear, the input shaft, and the carrier with one another and/or a ground. Examples of such elements include clutches, brakes, and mechanical diodes.

A planetary transmission device with a small tooth number difference for implementing smart workload self-adaptation comprises a left planetary gear, a right planetary gear, a left-end disk, a right-end disk, a housing and a connection member. One end of the connection member axially run through the left planetary gear and the right planetary gear. End parts of both ends of the connection member are fixedly connected to the left-end disk and the right-end disk respectively. By means of a force closure mechanism, the transmission device can automatically and steplessly adjust a transmission ratio and an output rotation speed according to a change in load without depending on a measurement md control system, md has a simple structure and low costs.

A planetary transmission device with a small tooth number difference for implementing smart workload self-adaptation comprises a left planetary gear, a right planetary gear, a left-end disk, a right-end disk, a housing and a connection member. One end of the connection member axially run through the left planetary gear and the right planetary gear. End parts of both ends of the connection member are fixedly connected to the left-end disk and the right-end disk respectively. By means of a force closure mechanism, the transmission device can automatically and steplessly adjust a transmission ratio and an output rotation speed according to a change in load without depending on a measurement md control system, md has a simple structure and low costs.

A transmission includes a first planetary gear set and a second planetary gear set that are the only planetary gear sets interconnected from an input to an output. The first planetary gear set includes an input-only first input gear and a first non-input/output gear, a first pinion gear meshed therebetween, and a first output planetary carrier carrying the first pinion gear. The first output planetary carrier is alternatively output-only or output-and-input. Moreover, the first non-input/output gear is alternatively held when the first output planetary carrier is output-only or released when the first output planetary carrier is output-and-input. The second planetary gear set includes an input-only second input gear and a grounded second non-input/output gear, a second pinion gear meshed therebetween, and an output-only second output planetary carrier carrying the second pinion gear.

A transmission includes a first planetary gear set and a second planetary gear set that are the only planetary gear sets interconnected from an input to an output. The first planetary gear set includes an input-only first input gear and a first non-input/output gear, a first pinion gear meshed therebetween, and a first output planetary carrier carrying the first pinion gear. The first output planetary carrier is alternatively output-only or output-and-input. Moreover, the first non-input/output gear is alternatively held when the first output planetary carrier is output-only or released when the first output planetary carrier is output-and-input. The second planetary gear set includes an input-only second input gear and a grounded second non-input/output gear, a second pinion gear meshed therebetween, and an output-only second output planetary carrier carrying the second pinion gear.

A gear assembly includes a planetary gear set and a clutch. The planetary gear set includes a sun gear, at least one planet gear meshing with the sun gear, a carrier supporting the at least one planet gear, and an outer ring gear meshing with the at least one planet gear. The clutch is operable to engage with and disengage from the planetary gear set to enable the planetary gear set to switch between a first mode and a second mode.

A gear assembly includes a planetary gear set and a clutch. The planetary gear set includes a sun gear, at least one planet gear meshing with the sun gear, a carrier supporting the at least one planet gear, and an outer ring gear meshing with the at least one planet gear. The clutch is operable to engage with and disengage from the planetary gear set to enable the planetary gear set to switch between a first mode and a second mode.