Patent application number | Description | Published |
20080282826 | Roller Track for a Roller Screw - 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. | 11-20-2008 |
20090071278 | Ball screw device having image sensor - 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. | 03-19-2009 |
20090158873 | Roller Screw with a Circulating Structure - 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. By such arrangements, the cross section of the roller screw with a circulating structure is continuous and complete, such that the rollers can be circulated in each path smoothly | 06-25-2009 |
20090308192 | Ball screw device having bearing members of different load - 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. | 12-17-2009 |
20100064836 | Roller Screw Having Plural Circulating Devices Cooperating with Plural Helical Grooves - 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. | 03-18-2010 |
20100071494 | Ball Screw Unit with Dual Ball Deflect Arrangements - 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. | 03-25-2010 |
20100180706 | Roller Screw Structure - 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. | 07-22-2010 |
20100288063 | Dustproof device for ball screw apparatus - 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. | 11-18-2010 |
20130055839 | BALL SCREW WITH SECTIONAL CIRCULATING ASSEMBLIES - A ball screw with sectional circulating assemblies 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 rolling balls and the screw shaft are positioned, thus preventing the rolling balls from dropping out and the interference with the threads of the screw shaft. After the rolling balls and the screw shaft are positioned, the outer circulating block is placed into the nut and 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. | 03-07-2013 |
20140016890 | BEARING DEVICE FOR MOTION GUIDE DEVICE - A motion guide device includes a rolling passage formed between two members, a number of cylindrical roller bearing members disposed in the rolling passage and engaged between the members, and a number of spacers disposed in the rolling passage and engaged between the cylindrical roller bearing members, the spacers each include two opposite curved depressions for engaging with the cylindrical outer peripheral surfaces of the cylindrical roller bearing members, and each defined by a planar middle surface, a tilted upper surface and a tilted lower surface inclined relative to the planar middle surface and the vertical axis (Z) of the spacer for selectively engaging with the cylindrical roller bearing members. | 01-16-2014 |