A reduction in the amount of filled grease and a reduction in weight are achieved, and an excessive rise in the internal pressure is suppressed. Provided is a gearbox including: a plurality of gears that are rotated by a motor; a housing that has a sealed interior space for rotatably accommodating the respective gears; and a spacer that is disposed in the interior space of the housing and that partially occupies the interior space, wherein the spacer has a lower density than grease and is elastically deformable so as to change the volume thereof according to the internal pressure of the interior space.

A ball screw device includes an elongated shaft having an outer groove, a ball nut having a screw hole for receiving the elongated shaft and having a passage communicating with the screw hole of the ball nut, and a lubricating device includes an oil distributing member engaged into the ball nut and having one end portion engaged into the ball nut for engaging with the groove of the elongated shaft, and a spacing element is attached onto an outer peripheral portion of the distributing member, and the spacing element includes an end portion engaged into the ball nut for engaging with the elongated shaft and for spacing the distributing member from being engaged with the elongated shaft.

A ball screw device includes an elongated shaft having an outer groove, a ball nut having a screw hole for receiving the elongated shaft and having a passage communicating with the screw hole of the ball nut, and a lubricating device includes an oil distributing member engaged into the ball nut and having one end portion engaged into the ball nut for engaging with the groove of the elongated shaft, and a spacing element is attached onto an outer peripheral portion of the distributing member, and the spacing element includes an end portion engaged into the ball nut for engaging with the elongated shaft and for spacing the distributing member from being engaged with the elongated shaft.

A fluid containing component is provided having a structure and a sump for storing a fluid. A gear baffle is disposed between the rotatable component and the structure. The gear baffle includes a first side end and a second side defining a gear cavity therebetween. The fluid displaced by rotation of a gear positioned within the gear baffle collects on inner surfaces of the gear baffle and is directed out of the gear baffle through at least one flow port of the baffle.