deflector type ball screw

0000026251 00000 n BEAVER AEROSPACE & DEFENSE, INC., MICHIGAN, Free format text: 0000005487 00000 n 4 is an elevational view of a preferred embodiment of the ball deflector of the present invention. 0000006054 00000 n 0000009753 00000 n To this end, NSK has created a deflector type ball screw that boasts the highest* maximum feed speed in the world, and that conforms to German DIN industrial standards. This article presents all the information you need to know about ball screws. 5 is a plan view of the preferred ball deflector of FIG. 2 0 obj Inaccurate mounting causes noise, vibration, positioning errors, and may cause material failure and accelerated wear during continuous operation. 2 is a cross sectional view along lines 2--2 of FIG. The balls pass through an external tube that is protruding from the ball nuts wall. The deflector 50 incorporates an elongate body 52, wherein a threaded stem 54 is rigidly affixed to the body 52, preferably integral therewith. Example (2): The Internal Ball Return System used by Barnes Industries. In a preferred form, the ball deflector is mounted within the nut of a recirculating ball screw and nut assembly, the deflector having an elongate body adapted for cooperation with balls moving within a ball passage formed by a segment of cooperating helical grooves in the screw and nut. 0000025842 00000 n In this type of return system, the ball is returned to the opposite end of the circuit through or along the nut wall, but below the outside diameter through a "V" cap. 0000005814 00000 n With this profile, the ball has one contact point on the screw shaft and one contact point on the nut. This may be appreciated by those skilled in the art by reference to the cross section 2--2 of FIG. As a result, the working action of the deflector is compromised and maximum efficiency or smoothness in circulation of the balls is inhibited. Deflectors, return tubes, and end caps are devices used to feed the ball back to its original position. The screw shaft is the component of the ball screw that receives rotational force for it to rotate about its axis; this is translated to linear motion. Meanwhile, lead screws are used for transfer applications where speed, accuracy, and precision are not of high priority. screw ball bolas husillo skf

Preloading is the application of force to compact the ball screw structure to avoid backlash. The upper and lower bodies 62 and 64 are symmetrically positioned with respect to each other. GVS:,AiBqE.9\y@mZ(\=[&u'tX. Each ball deflector 30 has an elongate body 32 retained within the mating helical grooves of the screw and nut. Ball screw and nut assemblies include deflectors for the purpose of ensuring efficiency of ball transfer between return tubes and associated ball passages formed by helical grooves provided in the screw and nut. FIG. In a preferred form, the bosses are disposed in adjacent quadrants on an upper body portion of the elongated deflector body, and are arranged in pairs, each disposed at opposite ends of the deflector body and located adjacent the ends of the deflector. They also generate less noise and vibration than external systems because recirculation only occurs inside the nut housing. 4, 5, and 6, a preferred embodiment of the deflector 50 of the present invention is now shown and described.

Ball screws use rolling and recirculating ball bearings in the ball grooves in the screw and the nut. Lead screws, like ball screws, serve a similar purpose to mechanical linear actuators that translate rotational motion to linear motion. The ball bearings, or the balls, are the most prominent component of the ball screws that moves between the clearance of the nut and the shaft. When a long ball screw rotates at high speed it can begin to vibrate once the slenderness ratio reaches the natural harmonics for that shaft size. The preloading mechanism dictates if the ball screw has a single or double ball nut. 0000003690 00000 n The ball groove profile of a ball screw may either be a semi-circular arc or a gothic arc. Barnes Industries engineering department has developed various rotating ball nut designs. 432 69 2 will be treated as a single one of the three continuous or endless trains of balls 22. Single start screws are the most common. The turn is the number of trips that a ball travels before being recirculated. It is a left-hand ball screw if the groove runs in a counterclockwise direction and it slants to the left. These are used in many applications across many industries. However, the number of balls accommodated around the screw shaft decreases, resulting also in a decrease in load capacity. A substantial improvement would result if there were provided a mechanical means to alleviate or minimize such movement during fit-up of the deflector body within the nut groove. Continuous rubbing of the metal components with poor lubrication causes galling, a form of abrasive wear that causes tearing of the metal surface at the microscopic level. 0000004239 00000 n screw ball thk standard india The industrys smallest nut dimensions were achieved by using an improved ball circulation system called deflector method, which allows for minimal nut dimensions. The two groove profiles differ on the contact points they touch on the ball. %`vQ@9Jy=,swSIue0'G%}'#s-GF\tde9NMJeU DpVXWq;@Mn>.}~q066#di(ZQ!agk3id:He.LS9b=o#`4eAPFM#cTgm I The semi-circular arc profile is formed from a single arc, while the gothic arc profile has an ogival shape formed from two arcs. website require registration. This is a very durable ball return system and is also used on high load carrying applications. 8. 0000015650 00000 n 0000006667 00000 n Ideally, the bosses are symmetrically positioned on the upper body in a manner such that the two equal angles A equal 10 to 25 degrees (FIG. The ball screw is identified as a right-hand ball screw if the groove is traced in a clockwise direction around the screw shaft and slants to the right. The purposes of preloading are to increase the rigidity and to eliminate the backlash of the ball screw assembly. 0000024760 00000 n Lead screws have deeper helical threads in the screw shaft and a matching nut that slides with each other. 6 cross sectional view along lines 6--6 of FIG. It has a compact size, which is suitable for small clearance assemblies. The ball deflector of claim 4 wherein each of said bosses lies on an angle of 10 to 25 degrees as measured from a line which passes through the center of the upper body, said line being orthogonal to said vertical centerline. 0000008936 00000 n FIG. The ball deflector of claim 7 wherein said bosses are semi-spherical, each having an initial unadjusted radius of approximately 0.100 inch. The main components of ball screws are the screw shaft, the nut, and the ball bearings (or balls). The friction acting on the ball screw component is the rolling friction, which is relatively smaller compared to sliding friction. The radius R1 of the lower body 64 is approximately 30 percent of the ball diameter, while the radius R2 of the upper body 62 may range from approximately 35 to 50 percent of the ball diameter. MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING, ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL, Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms, Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions, Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members, Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls, Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls, GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS, TECHNICAL SUBJECTS COVERED BY FORMER USPC, TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION, ASSIGNMENT OF ASSIGNORS INTEREST. Assigned to SANWA BUSINESS CREDIT CORPORATION 1 SOUTH WACKER, SANWA BUSINESS CREDIT CORPORATION 1 SOUTH WACKER. Call 248.541.2333 Today The efficiency of screws is measured by their capability to transform power utilized in exerting rotational force to the linear distance covered. To benefit from the lead accuracy a ball screw offers, it must have an accurate mounting. The return tube directs the balls back to their starting point. The primary function of ball screws is to convert rotational motion to linear motion. 1. A lead screw is a kind of mechanical linear actuator that converts rotational motion into linear motion. Lead screws do not typically reach the torque conversion efficiencies of ball screws (around 90%). 0000010364 00000 n The ball deflector of claim 5 wherein said recirculating ball screw and nut assembly comprises a plurality of recirculating balls, and wherein said radius of said lower body portion comprises approximately 30% of said ball diameter. The ball nut determines the load and life of the ball screw assembly. The design of ball screws yields high accuracy during operation. For every turn, there must be one deflector to close the pathway of the ball. This is where a rotating ball nut design is needed. The pitch refers to the distance of two consecutive threads, while the lead is the linear distance covered in one complete rotation. Please fill out the following form to submit a Request for Quote to any of the following companies listed on.

%%EOF 0000015939 00000 n 0 0000009944 00000 n However, this preload mechanism creates longer leads, which reduce the load capacity of the ball screw. FIG. It is the minimum diameter of the screw shaft. Assigned to BEAVER AEROSPACE & DEFENSE, INC. Assignors: BEAVER PRECISION PRODUCTS, INC. An integral ball deflector stem 34 has an exterior threaded surface which receives a conventional threaded fastener 36 for retaining each deflector 30 rigidly within the groove 20 of the nut 18. 0000035021 00000 n Preload is applied by assembling larger ball bearings. bk10 bf10 ballscrew sfu1204 floated mounts 2, while appearing to show one of the three loops, actually depicts partial views of two separate loops. They are capable of carrying heavier loads than single circuit ball nuts. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BEAVER PRECISION PRODUCTS, INC.;REEL/FRAME:008512/0558, Free format text: As the lead of ball screws increases, the linear distance covered and the speed increase.

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deflector type ball screw