Electric commercial vehicle power steering system with a globoidal wormgearing

An electric commercial vehicle power steering system, comprising:

• a housing;
• an input shaft rotatable within the housing;
• an electric motor mounted to the housing;
• a planetary gear set disposed within the housing and comprising a sun gear, a plurality of planet gears. a planet carrier, and a ring gear a first one of the sun gear, the planet carrier. and the ring gear of the planetary gear set is connected to and rotatable with a rotor of the electric motor;
• a drive coupling disposed within the housing and comprising a first gear and a second gear. a second one of the sun gear, the planet carrier and the ring gear of the planetary gear set is connected to and rotatable with the first gear of the drive coupling, and the second gear of the drive coupling is connected to and rotatable with the input shaft, the drive coupling further comprising at least one additional gear meshed with the first and second gears of the drive coupling;
• an output shaft rotatable within the housing;
• a globoidal worm drive disposed within the housing and arranged between the input shaft and the output shaft. the globoidal worm drive coupling the input shaft to the output shaft such that the output shaft is rotatable with the input shaft via the globoidal worm drive,
• a Pitman arm connected to the output shaft;
• a steering knuckle with a steering arm;
• and
• a drag link extending between and connected to the Pitman arm and the steering arm of the steering knuckle,
• wherein the input shaft extends between a first end portion and a second end portion, the input shaft forms a manual drive interface at the first end portion of the input shaft, and a globoid worm of the globoidal gearing is positioned on the input shaft proximate the second end portion of the input shaft
• wherein the input shaft is connectable to a steering column at the manual drive interface such that the input shaft is rotatable via the steering column, and
• wherein the electric motor of the electric commercial vehicle power steering system is operable to turn the steering knuckle.

An electric commercial vehicle power steering system, comprising:

• a housing;
• an input shaft rotatably mounted within the housing;
• an electric motor mounted to the housing;
• a planetary gear set disposed within the housing, the planetary gear set comprising a sun gear, a plurality of planet gears, a planet carrier, and a ring gear, the sun gear of the planetary gear set connected to and rotatable with a rotor of the electric motor;
• a drive coupling disposed within the housing, the drive housing comprising comprising a first gear and a second gear, the planet carrier of the planetary gear set connected to and rotatable with the first gear of the drive coupling, the second gear of the drive coupling connected to and rotatable with the input shaft, the drive coupling further comprising at least one additional gear meshed with the first and second gears of the drive coupling;
• an output shaft rotatably mounted within the housing ;
• a globoidal worm drive disposed within the housing, the globoidal worm drive comprising a globoid worm meshed with a globoid worm wheel, the globoid worm positioned on the input shaft, the globoid worm wheel positioned on the output shaft;
• a Pitman arm connected to the output shaft;
• a steering knuckle with a steering arm;
• and
• a drag link extending between and connected to the Pitman arm and the steering arm of the steering knuckle,
• wherein the electric motor of the electric commercial vehicle power steering system is operable to turn the steering knuckle.

An electric commercial vehicle power steering system, comprising:

• a housing;
• an input shaft rotatably mounted within the housing;
• an electric motor mounted to the housing;
• a planetary gear set disposed within the housing, the planetary gear set comprising a sun gear, a plurality of planet gears, a planet carrier, and a ring gear the sun gear of the planetary gear set connected to and rotatable with a rotor of the electric motor;
• a drive coupling disposed within the housing, the drive housing comprising comprising a first gear and a second gear, the planet carrier of the planetary gear set connected to and rotatable with the first gear of the drive coupling, the second gear of the drive coupling connected to and rotatable with the input shaft, the drive coupling further comprising a belt or chain coupling the first gear of the drive coupling to the second gear of the drive coupling;
• an output shaft rotatably mounted within the housing;
• a globoidal worm drive disposed within the housing, the globoidal worm drive comprising a globoid worm meshed with a globoid worm wheel, the globoid worm positioned on the input shaft, the globoid worm wheel positioned on the output shaft:
• a Pitman arm connected to the output shaft:
• a steering knuckle with a steering arm;
• and
• a drag link extending between and connected to the Pitman arm and the steering arm of the steering knuckle,
• wherein the electric motor of the electric commercial vehicle power steering system is operable to turn the steering knuckle.