Abstract: A screw-driven fan device includes a screw, a screw nut, a fan, and a connecting unit. An external edge of the screw has a rolling groove formed thereon and a groove formed alternately with the rolling groove. The screw nut, disposed on the screw, has a linking portion. The fan has a rotary axle with a hole formed thereon for screw passing through. The fan further has blades surrounding the rotary axle. The hole has a flange formed on an interior side thereof and engaged with the groove. The connecting unit has a space therein such that the fan can be placed in the space.

Abstract: A roller screw having plural circulating devices cooperating with plural helical grooves comprises a screw, a nut, plural rollers and circulating devices. The screw is provided in a surface with at least two helical grooves. The nut is provided with helical grooves opposite to the screw and receiving holes in a peripheral wall thereof, and each receiving hole is provided with a fixing groove at each of two ends thereof. The rollers are arranged in the helical grooves of the screw and the nut. The circulating devices have the same number of the helical grooves of the screw, and each circulating device includes an opening at each of two ends thereof and a passage between the two openings.

Abstract: A ball screw device includes an elongated screw shaft and a ball nut having helical grooves for receiving ball bearing members, a housing is attached to the ball nut and includes a bore for receiving the screw shaft, and includes one or more slots communicative with the bore of the housing, and one or more wiper members are changeably engaged into the slots of the housing and include a wiper element engaged into the bore of the housing for engaging into the groove of the screw shaft and for removing or wiping off the dirt from the helical groove of the screw shaft and for preventing the ball nut and the screw shaft from being damaged by the dirt.

Abstract: A roller screw structure comprises a nut, a screw and a rolling assembly. The rolling assembly is movably disposed between the nut and the screw and includes at least one rolling cone. The slantwise rolling surface of the rolling cone contacts the spiral groove surfaces of the nut and the screw in a line-to-line manner, and the angle between the rolling surface and the self-rotation axis of the rolling cone is from 0 degree to 6.3 degrees. Thereby, making the distance between the self-rotation axis and the rolling surface of the rolling cone of the rolling assembly different can prevent the occurrence of speed difference caused at different rolling paths of the rolling assembly.

Abstract: A rolling element screw comprises a screw and a nut mounted on the screw. The screw and the nut are defined with opposite rolling grooves to form a loaded path in which plural rolling elements are to be disposed. The nut is provided with a return element at each of two opposite ends thereof for cooperating with the loaded path. The respective return elements include a return path, and the return paths of the two return elements connect with the loaded path to form a circulation path. The junction where the respective return paths of the return elements are connected to the loaded path is designed to be an inclined surface including a lower portion and an upper portion. There is a height difference between the nut rolling grooves and the respective return paths, so that the rolling elements can roll more smoothly without causing the jammed problem.

Abstract: A screw-driven fan device includes a screw, a screw nut, a fan, and a connecting unit. An external edge of the screw has a rolling groove formed thereon and a groove formed alternately with the rolling groove. The screw nut, disposed on the screw, has a linking portion located on one end of the screw nut. The fan has a rotary axle with a hole formed thereon for screw passing through. The fan further has blades surrounding the rotary axle. The hole has a flange formed on an interior side thereof, and the flange is engaged with the groove. When the screw rotates, the coordination of the flange and the groove causes the fan rotates simultaneously. The connecting unit has one side mounted on the linking portion of the screw nut. The connecting unit has a space therein such that the fan can be placed in the space, thereby the fan and the screw nut move together.

Abstract: A ball crew unit with dual ball deflect arrangements includes a pair of circulation ball deflect units. One of them is equipped axially in a first cavity provided in the nut, while the other is equipped radially in a second cavity provided in the nut. By so, the traditional buck toothed design for the external helical grooves of the shaft can be eliminated, and is unnecessary to lengthen the nut in order to avoid mutual interference between the ball deflect unit and the nut flange, the circulation tunnel formed in the nut does not have to run through the whole nut either so that the structure of the ball screw unit can be simplified. As a result the assembly work is facilitated, production cost is reduced while the mechanical property is upgraded.

Abstract: A roller screw having plural circulating devices cooperating with plural helical grooves comprises a screw, a nut, plural rollers and circulating devices. The screw is provided in a surface with at least two helical grooves. The nut is provided with helical grooves opposite to the screw and receiving holes in a peripheral wall thereof, and each receiving hole is provided with a fixing groove at each of two ends thereof. The rollers are arranged in the helical grooves of the screw and the nut. The circulating devices have the same number of the helical grooves of the screw, and each circulating device includes an opening at each of two ends thereof and a passage between the two openings.

Abstract: A ball screw device includes a screw shaft engaged into a ball nut and each having helical grooves for forming two multiple turn, helical raceways, a group of rollers is received in one of the helical raceways for bearing a greater load in a forward-motion, and a group of ball bearing members is received in another helical raceway for bearing a smaller load in a backward-motion. The helical groove of the screw shaft may include a V-shaped cross section, or a flat surface at one side for engaging with the rollers, and a curved surface at another side for engaging with the ball bearing members. The ball nut may include two nut members secured together.

Abstract: A roller screw with a circulating structure mainly comprises two circulating members and a return pipe. Each circulating member includes a return path that is rotated relative to a tangent plane tangent to the circumference of the helical groove of the nut, and the cross section of each return path is square-shaped. The return pipe is formed with a guiding route having a square-shaped cross section, and both ends of the guiding route are connected to the return paths of the circulating members, respectively. The return paths are connected to and tangent to the helical grooves, and an angle between the tangent surfaces is approximately 90 degrees.

Abstract: A ball screw unit with dust cleaning and ball deflecting element fixing mechanism includes an annular inlaid slot along the inner surface of a nut proper proximate to the outside of a ball deflecting element. A fixed dust scrape formed of a C shaped annular packing is installed in the annular inlaid slot. The C shaped annular packing is covered with a soft covering layer at its inner fringe and the outer fringe of the soft covering layer is just stuffed in the annular inlaid slot of the nut proper. Inner fringe of the soft covering layer is formed into a spiral scraper blade corresponding to the rolling spiral slot of the screw blot. The fixed dust scraper is tightly fixing the ball deflecting element to the nut proper by means of the resiliency of the soft covering layer to clean the dust along the rolling spiral slot with its spiral scraper blade thereby serving as a dust cleaner.

Abstract: A ball screw device includes a number of bearing members received between a ball nut and a screw shaft, and an image device engaged into the bore of the ball nut, and directed toward the screw shaft but spaced from the screw shaft for taking an image of the screw shaft and for viewing a changing of the inner thread of the screw shaft and for allowing the users to change or to replace the worn out ball nut and/or the worn out screw shaft and/or the worn out bearing members right away or at the best time. A processor device may be coupled to the image device for processing the images taken by the image device. A displayer may display the images, and a warning device may generate a warning signal when the screw shaft has been worn out.

Abstract: A ball screw unit has a plurality of partition-rooms each of them accommodating a spacer ball interposed between two load carrying balls. The partition room is formed into two oblique frustum shaped recesses each of them extends a flared mouth tilted downwards to the longitudinal axis of the ball screw unit. The partition room is made of elastic polymer material to facilitate pushing the spacer ball into an oblate ellipsoidal hole opened on the partition room, and the hole is also communicated with the two recesses. With this structure, the spacer balls can be held stably in the partition rooms without the fear of escaping or occurrence of disorganized ball squeezing during operation of the ball screw unit. Besides, the dimension of spacer ball may be made as small as possible so as to increase the number of load carrying balls thereby resulting in improvement of load carrying capability of the structure.

Abstract: A roller screw structure comprises a nut, a screw and a rolling assembly. The rolling assembly is movably disposed between the nut and the screw and includes at least one rolling cone. The slantwise rolling surface of the rolling cone contacts the spiral groove surfaces of the nut and the screw in a line-to-line manner, and the angle between the rolling surface and the self-rotation axis of the rolling cone is from 0 degree to 6.3 degrees. Thereby, making the distance between the self-rotation axis and the rolling surface of the rolling cone of the rolling assembly different can prevent the occurrence of speed difference caused at different rolling paths of the rolling assembly.

Abstract: A spacer contains a magnetic filler and is disposed between the magnetic conductive balls. The magnetic filler produces an indirect magnetic attractive force on the balls, therefore, when the interval between the two neighboring balls is overlarge, the spacer will not tip over under the effect of gravity or centrifugal force, but will be adsorbed on the balls by the magnetic filler.

Abstract: A roller track for a roller screw is formed on a screw and a nut of the roller screw respectively, and the roller track is similar to a V-shaped structure. Round angles with the same radius are formed on the outer edges for contacting rollers. Thereby, the roller chain of the present invention can avoid the two problems of the stress centralization of the rollers and the excessively small contact length of the rollers, further to lift the load capability of the roller screw.

Abstract: A ball screw device includes a ball nut having an inner thread and a channel communicating with each other, a screw shaft threaded with the ball nut, a number of bearing members engaged in between the ball nut and the screw shaft and in the channel of the ball nut. A bearing housing is engaged onto the ball nut for forming a sealed annular gap between the bearing housing and the ball nut and for receiving a lubricating oil, and an oil forcing member includes an extension extended into the annular gap that is formed between the bearing housing and the ball nut for forcing or scrubbing or propelling the lubricating oil to flow into the channel in order to lubricate the bearing members.

Abstract: A circulation system for a ball screw comprises: a screw, a nut, a plurality of return assemblies and balls. The positioning groove of the nut is axially formed with an abutting surface for mating with the return assemblies, in the abutting surface is formed a tapered hole for connecting the through hole, and the abutting surface doesn't interfere with the helical groove, on the open end of the returning assemblies connecting to the through hole is formed a protruding turning structure to be engaged in the tapered hole. The design of the return assembly of the present invention can solve the problem that the radius of curvature of the conventional return path is relatively small and the positioning groove destroys the helical groove, thus increasing the radius of curvature of the return path, and relatively improving the ease of rolling of the balls during circulation.

Abstract: A sectional circulating assembly for a ball screw comprises an inner circulating block and an outer circulating block. In assembly, the inner circulating block is initially placed between the screw shaft and the nut before the balls and the screw shaft are positioned, thus preventing the balls from dropping out and the interference with the threads. After the balls and the screw shaft are positioned, the outer circulating block is placed into the nut and to be engaged with the inner circulating block, and the outer circulating block is fixed to the nut. This method can maintain the tightness of the nut, thus preventing the leakage of noise.

Abstract: A roller screw system comprises a screw shaft, a nut, a pair of return members, a return pipe and a plurality of rollers. The nut is interiorly defined with a receiving recess for accommodation of the return members, and an abutting surface. The roller screw system is characterized in that a through hole is defined in the nut and is in communication with the return hole. The return pipe is disposed in the through hole of the nut. The return members are disposed in the receiving groove of the nut, forming a return system. And the return system is to be connected to the helical groove of the screw shaft and the nut, thus forming a roller screw system. By such arrangements, the rollers can circulate more smoothly and the size of the nut will not be increased.