A gear motor includes a speed reducer and a motor. The speed reducer includes an internal gear, an external gear, an input shaft having an oscillating portion oscillating the external gear, an oscillating bearing which is disposed between the external gear and the oscillating portion, and an input bearing which supports the input shaft, the input shaft includes a protrusion portion which protrudes from the motor side such that a rotor of the motor is provided in the protrusion portion, and includes a bearing disposition section in which the input bearing is disposed and a rotor disposition section in which the rotor is disposed in this order from the speed reducer side toward the motor side, an outer diameter of the rotor disposition section is equal to or less than an outer diameter of the bearing disposition section, and a rotor magnet is directly fixed to the rotor disposition section.

A gear motor includes a speed reducer and a motor. The speed reducer includes an internal gear, an external gear, an input shaft having an oscillating portion oscillating the external gear, an oscillating bearing which is disposed between the external gear and the oscillating portion, and an input bearing which supports the input shaft, the input shaft includes a protrusion portion which protrudes from the motor side such that a rotor of the motor is provided in the protrusion portion, and includes a bearing disposition section in which the input bearing is disposed and a rotor disposition section in which the rotor is disposed in this order from the speed reducer side toward the motor side, an outer diameter of the rotor disposition section is equal to or less than an outer diameter of the bearing disposition section, and a rotor magnet is directly fixed to the rotor disposition section.

A vehicle drive device includes: an input shaft that receives a driving force of a driving source and that is provided with a first gear; an intermediate shaft that is provided with a second gear meshing with the first gear and a third gear located next to the second gear in a direction of a rotation axis and that is disposed in such a manner that the intermediate shaft is allowed to move in the direction of the rotation axis; an output shaft that is provided with a fourth gear meshing with the third gear; a first gear pair including the first and second gears; and a second gear pair including the third and fourth gears. One of the first gear pair and the second gear pair includes a helical gear, and the other of the first gear pair and the second gear pair includes a double helical gear.

A worm reducer includes a worm shaft; a worm wheel; a housing that houses the worm shaft and the worm wheel; a bearing that holds the worm shaft inside the housing; a coil spring that contacts an outer peripheral surface of the bearing and applies an urging force toward the worm wheel; and a preload member that is screwed into and fixed to the housing and pressurizes the coil spring. A winding direction of the coil spring is different from a winding direction of a thread of the preload member, and contact resistance between the coil spring and the preload member is greater than contact resistance between the coil spring and the bearing.

A worm reducer includes a worm shaft; a worm wheel; a housing that houses the worm shaft and the worm wheel; a bearing that holds the worm shaft inside the housing; a coil spring that contacts an outer peripheral surface of the bearing and applies an urging force toward the worm wheel; and a preload member that is screwed into and fixed to the housing and pressurizes the coil spring. A winding direction of the coil spring is different from a winding direction of a thread of the preload member, and contact resistance between the coil spring and the preload member is greater than contact resistance between the coil spring and the bearing.

A helical-gear transmission for an electromechanical power steering includes a shaft intermeshing with a helical gear. The shaft is arranged in a transmission housing and is rotatably mounted in the transmission housing about a longitudinal axis, having the first end thereof in a drive-side bearing arrangement and the second end thereof in a non-drive-side bearing arrangement. The transmission housing has, in extension of the shaft on a non-drive-side end, an opening which can be sealed by a cover, wherein the cover has a cover base and a surrounding cover edge, wherein the cover base has, in the region of the shaft, a bulge extending to the outside in the direction of the shaft which forms an axial lock of the shaft.

A helical-gear transmission for an electromechanical power steering includes a shaft intermeshing with a helical gear. The shaft is arranged in a transmission housing and is rotatably mounted in the transmission housing about a longitudinal axis, having the first end thereof in a drive-side bearing arrangement and the second end thereof in a non-drive-side bearing arrangement. The transmission housing has, in extension of the shaft on a non-drive-side end, an opening which can be sealed by a cover, wherein the cover has a cover base and a surrounding cover edge, wherein the cover base has, in the region of the shaft, a bulge extending to the outside in the direction of the shaft which forms an axial lock of the shaft.

A method and system for an axle assembly are provided. The axle assembly, in one example, includes a cover at least partially circumferentially surrounding a shaft, a bearing coupled to the shaft and the cover, the bearing including an outer race, and a bearing adjuster including a first axial side adjacent to the outer race and configured to set a bearing preload and/or end play. The assembly further includes a lubricant seal spaced axially away from the bearing adjuster and sealing a lubricant bore and the lubricant bore traverses the cover and extends axially toward the bearing adjuster.

An aspect of the present invention provides a speed reducer including a supporting block, an input gear rotatably supported on the supporting block, an intermediate gear meshing with the input gear, an output gear meshing with the intermediate gear, and a gear position changing mechanism configured to change a position of the intermediate gear relative to the input and output gears.

An aspect of the present invention provides a speed reducer including a supporting block, an input gear rotatably supported on the supporting block, an intermediate gear meshing with the input gear, an output gear meshing with the intermediate gear, and a gear position changing mechanism configured to change a position of the intermediate gear relative to the input and output gears.