A ballscrew assembly comprises: a nut having a nut body with a radially inner surface and a helical groove formed on the radially inner surface; a screw shaft disposed within the nut, the screw shaft comprising a radially outer surface and a groove formed on the outer surface, the groove on the screw shaft cooperating with the groove on the nut to define a helical raceway for a plurality of balls; at least one lubricant reservoir formed in the nut body at or adjacent to an end of the helical raceway; and a lubricant passage extending through the nut body and fluidly coupled to the at least one lubricant reservoir; wherein the lubricant reservoir is fluidly linked to the helical groove of the nut via the lubricant passage.

An actuator system includes a housing with a screw shaft extending along a longitudinal axis. The stator component of an electric motor is coupled to the housing, with a rotor extending along the longitudinal axis. A thrust tube is engaged with the screw shaft, for example with a nut assembly configured to convert rotational motion of the rotor into linear motion of the thrust tube. A modular cooling assembly is selectively coupled to the exterior surface of the actuator housing, and configured to dissipate heat.

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 inner cylindrical element engaged onto the elongated shaft and secured to the ball nut, a housing attached onto the cylindrical element and contacted with the ball nut, and the housing includes a chamber for receiving a lubricating grease, an oil distributing member is engaged into the passage of the ball nut and engaged into the screw hole of the ball nut for engaging with the elongated shaft, and an inner element is engaged in the housing and engaged with the distributing member for supplying the lubricating grease to the distributing member.

A wave machine (8) that produces different shapes of standing, parabolic-shaped waveforms (150) used by surfers (200). The parabolic waveforms (150) have different face angles and depths. The machine (8) includes a rotating container (10) partially filled with a fluid 140. When the container (10) is rotated, a standing, parabolic waveform 150 is created in the fluid (140). In one embodiment, the container (10) is bowl container (11) with curved panels (60) and terminate at an upper edge (16). On or near the upper edge (16) of the sidewall (14) is upper flange (18) that partially extends into the bowl container (11). The bowl container (11) is coupled to a speed adjustable drive mechanism (50). As the bowl container (11) is rotated, fluid (14) is forced outward against the sidewall (14) and forms a parabolic waveform (150). As the speed of rotation is increased, the fluid (140) flows upward over the sidewall (14) and against the upper flange (18). The thickness, depth and face of parabolic waveform (150) adjacent to the sidewall (14) are increased.

An adjustment drive for a steering column of a motor vehicle may include a threaded spindle having an external thread, engaging with a corresponding internal thread of a spindle nut. A thread tooth of the external thread and a thread groove of the internal thread have corresponding axially sliding thread flanks that are braced against each other. At least one thread flank comprises at least one recessed lubricant uptake.

A ballscrew assembly includes a nut having a first helical groove formed on a radially inner surface and defining an axis, a screw disposed along the axis (X) and within the nut and that includes a second helical groove formed on a radially outer surface and opposed to the first helical groove so as to form a helical raceway. The assembly also includes a plurality of balls disposed in the helical raceway and an annular seal disposed radially between the nut and the screw. The seal includes a resilient body and a layer formed of PTFE and disposed radially between the resilient body and the screw and configured to contact the radially outer surface of the screw. An optional annular scraper is disposed axially adjacent to the seal and is configured to receive fluid at one axial end and expel fluid at a second axial end.

A lubrication system comprises a lubricant reservoir, a lubricant supply passage fluidly connecting the lubricant reservoir and a space requiring lubrication, and a lubricant supply pump. The supply pump includes a piston having a first piston head slidably received in a chamber in fluid communication with the lubricant reservoir and a second piston head slidably received in a pumping chamber. The pumping chamber is divided into a first and second cavities by the second piston head. The first cavity is between the first piston head and second piston head. The first and second cavities are placeable in fluid communication with pressure sources externally of the pumping chamber to provide a pressure differential between the first cavity and the second cavity, whereby the piston may move as a result of the pressure differential to cause the first piston head to dispense lubricant from the lubricant reservoir to the space.

A linear actuator system having an actuator housing, a motor assembly, a screw shaft, a thrust tube, and a nut assembly. The nut assembly is engaged with the screw shaft and directly coupled with the thrust tube. The nut assembly can define a mechanical fitting for direct physical engagement between the thrust tube and the nut assembly, absent additional load bearing components intervening therebetween. The nut assembly is configured to convert rotational motion of the rotor about the longitudinal axis to linear motion of the thrust tube along the longitudinal axis. A cooling loop can be at least partially embedded, potted or seated within the actuator housing, with a thermally conductive material disposed at least partially about the cooling loop to conduct heat from the actuator housing.

An actuator assembly is provided for converting rotation into linear displacement including a linear fluid dispensing tube for linear displacement. Hemispherical lugs are monolithically formed on the linear member. A primary gear includes a central bore having helix grooves formed into a surface of the central bore. The helix grooves receive the hemispherical lugs so that each helix groove mates with a respective hemispherical lug to reduce friction, so that hemispherical lugs slide smoothly within the respective helix grooves. Linear projections are formed on the exterior surface of the dispensing tube and extend longitudinally along the dispensing tube. A projecting portion has an aperture for receiving and guiding the dispensing tube through the linear displacement. Mating grooves are formed on an interior of the projecting portion for receiving and guiding the linear projections, thereby preventing the dispensing tube from rotating during travel.

A linear transmission device with capability of real-time monitoring of an amount of a lubricant includes a long shaft, a moving part, a lubricating device and a detecting module. The lubricating device includes a shell and an oil containing unit. The shell is formed with a first accommodating space. The oil containing unit is disposed in the first accommodating space and configured to provide the lubricant to an outer surface of the long shaft. The detecting module includes a temperature sensing unit and a control unit. The temperature sensing unit is configured to detect a current temperature of the oil containing unit. The control unit is connected with the temperature sensing unit and configured to: receive the current temperature; calculate a remaining amount of the lubricant of the oil containing unit based on the current temperature and an oil releasing model; and output the remaining amount.