Ball Spline Series
24Pages

Ball Spline Series_ Optimal for mechanisms that perform linear motion while transmitting a torque Capable of high-speed motion and high-speed rotation A wide array of lineups TOKYO. JAPAN CATALOG No.381-3E

Ball Spline Series Medium-torque Type High-torque Type Rotary Type

Ball Spline Series Seal Snap ring Spline shaft Spline nut Ball Ball Retainer Spline nut Snap ring Model LBS Seal Spline shaft Retainer Model LT Structure of Ball Spline Models LBS and LT Structure and Features The Ball Spline is an innovative linear motion system in which balls accommodated in the spline nut transmit torque while linearly moving on precision-ground raceways on the spline shaft. , Unlike the conventional structure, a single spline nut can provide a preload with THK s Ball Spline. As a result, the Ball Spline demonstrates high performance in environments subject to vibrations...

^Classification of Ball Splines There are three types of the Ball Spline: medium-torque type, high-torque type and rotary type. You can choose a type according to the intended use. In addition, wide arrays of spline nut shapes are available for each type, enabling the user to choose a desired shape according to the mounting or service Shaft diameter Nominal shaft diameter: Nominal shaft diameter: Model LBST Nominal shaft diameter: Nominal shaft diameter: Nominal shaft diameter: Nominal shaft diameter: Model LTR-A Nominal shaft diameter: Model LBGT Nominal shaft diameter:

QConditions and Guidelines for Selecting of a Preload Table 1 provides guidelines for selecting a clearance in the rotational direction with given conditions of The rotational clearance of the Ball Spline significantly affects the accuracy and rigidity of the spline nut. Therefore, it is essential to select a correct clearance according to the intended use. Generally, the Ball Spline is provided with a preload. When it is used in repeated circular motion or reciprocating straight motion, the Ball Spline is subject to a large vibration impact, and therefore, its service life and accuracy are...

Table 2 Clearance in the Rotational Direction for Models LT and LF Table 3 Clearance in the Rotational Direction for Models LBS, LBF, LBST, LBR and LBH Table 4 Clearance in the Rotational Direction for Model LTR

The accuracy of the Ball Spline is classified into three grades: normal grade (no symbol), high grade (H) and precision grade (P), according to the run-out of spline nut circumference in relation to the support of the spline shaft. Fig. 3 shows the measurement items. Part-mounting section Support section / Spline section \ Part-mounting section Support section Fig.3 Accuracy Measurement Items for the Ball Spline Table 5 Run-out of the Spline Nut Circumference in relation to the Support Section of the Spline Shaft Un( ^m Note 1 : The dimension in parentheses does not apply to a nominal shaft...

Table 7 Concentricity of the Part-mounting Section in Relation to the Support Section of the Spline Shaft Table 8 Perpendicularity of the Spline Nut's Flange Mounting Surface to the Support Section of the Spline Shaft Note: Except models LBG, LBGT, LTR and LTR-A Maximum Manufacturing Length by Accuracy Tables 9 and 10 show the maximum manufacturing lengths of the ball spline shafts by accuracy. Table 9 Maximum Manufacturing Length of Models Table 10 Maximum Manufacturing Length of Models The lengths in the table each represent the overall shaft length. For the standard hollow shaft type...

Dimensional Table for Model LT Note 1 : Models LT4 and 5 do not use a retainer. Do not remove the shaft from the spline nut (doing so will cause balls to fall off). Note 2: O: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available. "L"-Symbol for high-temperature type Example of model number coding Accuracy symbol Overall spline shaft Dust prevention accessory symbol No symbol: without seal UU: rubber seal attached on both ends of spline nut U: rubber seal attached on either end of spline nut Symbol for standard hollow spline shaft (no...

Note 3: MM indicates the permissible moment value in the axial direction when one spline nut is used. MA2 indicates the permissible moment value in the axial direction when two spline nuts are used. (Using a single LT unit is not stable in accuracy. We recommend using two units in close contact with each other.) Note 4: For details on the maximum lengths of ball spline shafts by accuracy, please see page 8.

Dimensional Table for Model LF 4-^di drilled through, ¡j>d2 counter bore depth h 4-^di drilled through, ¡j>d2counter bore depth h Note 1: 0:For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available. ~£-Symbol for high-temperature type Example of model number coding Accuracy symbol Overall spline shaft Dust prevention accessory symbol No symbol: without seal UU: rubber seal attached on both ends of spline nut U: rubber seal attached on either end of spline nut Symbol for standard hollow spline shaft (no symbol: solid spline shaft)

Note 2: MM indicates the permissible moment value in the axial direction when one spline nut is used. MA2 indicates the permissible moment value in the axial direction when two spline nuts are used. (Using a single LF unit is not stable in accuracy. We recommend using two units in close contact with each other.) Note 3: For details on the maximum lengths of ball spline shafts by accuracy, please see page 8.

Dimensional Table for Model LBS - Medium Load Type (Overall length with seal) (Overall length without seal) Note 1 : Models LBS6 and 8 are end cap types. With models LBS6 and 8, do not give a shock to the end cap. Note 2: A high-temperature type is not available for miniature Ball Splines. O: For those models, high-temperature types (metal retainer, service temperature: up to 100°C) are available. "E-Symbol for high-temperature type 9: Those models can be attached with a felt seal. Ball Splines using metal retainers cannot be attached with a felt seal.