Screw jacks with travelling ball nut (Mod.B)
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Screw jacks with travelling ball nut (Mod.B) 3.1 MA Series Mod.B - STRUCTURAL ELEMENTS 1 10 14 1 - ball screw in quenched and tempered alloy steel 2 - ball nut in case-hardened steel with flange according to DIN 69051 (available also with cylindrical flange), with grease nipple and end seals 3 - worm with ground ZI involute thread profile (UNI 4760) in case-hardened steel 4 - bronze worm wheel with true involute profile ZI (UNI 4760) 5 - cast iron support of the bronze worm wheel rim (size 5 and 10: entire wormwheel in bronze) 6 - ball screw fixed to the worm wheel through the cylindrical centring part and metric thread LEFT-HAND for PUSH load or RIGHT-HAND for PULL load 7 - lock nut with opposite metric thread direction to ensure a safe ball screw fixing 8 - ball screw – wormwheel pins against unscrewing 9 - thrust ball bearing for high load capacity 10- gear box 11 - low cover 12 - raised cover; may also be used as a centring diameter 13 - wormwheel radial bronze guide for higher stiffness and better efficiency 14 - grub screw to prevent the threaded cover unscrewing 15 - long-life synthetic oil lubricated worm gearbox 16 - radial lubricant seal 17 - O-ring 18 - breather 19 - oil level plug 20 - oil drain plug

Screw jacks with travelling ball nut (Mod.B) 3.2 SJ Series Mod.B - STRUCTURAL ELEMENTS 1 1 - ball screw in quenched and tempered alloy steel 2 - ball nut in case-hardened steel with flange according to DIN 69051 (available also with cylindrical flange), with grease nipple and end seals 3 - worm with ground ZI involute thread profile (UNI 4760) in case-hardened steel 4 - bronze worm wheel with true involute profile ZI (UNI 4760) 5 - cast iron support of the bronze worm wheel rim (size 5 ... 100: entire wormwheel in bronze) 6 - ball screw fixed to the worm wheel through the cylindrical...

Screw jacks with travelling ball nut (Mod.B) 3.3 HS Series - STRUCTURAL ELEMENTS 1 1 - ball screw in quenched and tempered alloy steel 2 - ball nut in case-hardened steel with flange according to DIN 69051 (available also with cylindrical flange), with grease nipple and end seals 3 - solid input shaft with key (or flange and hollow shaft for motor coupling) 4 - bevel gear in case-hardened and tempered steel 5 - output hollow shaft in hardened and tempered steel 6 - key to transmit the torque to the output shaft 7 - key to transmit the torque to the output shaft 8 - thrust ball bearing for...

Screw jacks with travelling ball nut (Mod.B) 3.4 Standard ball screw – gearbox arrangements Diameter Lead It is possible to supply screw-gearbox arrangements different from the standard ones. For more information please contact SERVOMECH. 3.5 Max. input power Pmax Following tables show the MAX. INPUT POWER Pmax [kW] to the gearbox at different speeds, calculated for a gear life of 10 000 hours. For different life requirements, please contact SERVOMECH. MA n1 [rpm] 3 000 1 500 1 000 750 500 300 100

Screw jacks with travelling ball nut (Mod.B) 3.6 TECHNICAL DATA MA BS Series Mod.B Load capacity [kN], (push - pull) Worm gear centre distance Mass of gear box without ball screw casting in aluminium alloy EN 1706 - AC-AlSi10Mg T6 casting in spheroidal graphite iron EN-GJS-500-7 (UNI EN 1563) Load capacity [kN], (push - pull) [mm] high Mass of gear box without ball screw casting in aluminium alloy EN 1706 - AC-AlSi10Mg T6 Worm gear centre distance casting in grey cast iron EN-GJL-250 (UNI EN 1561) 10.4 Load capacity [kN], (push - pull) Housing side dimensions casting in grey cast iron...

Screw jacks with travelling ball nut (Mod.B) 3.6 TECHNICAL DATA MA 80 BS Load capacity [kN], (push - pull) Worm gear centre distance casting in spheroidal graphite iron EN-GJS-500-7 (UNI EN 1563) 26 Mass of gear box without ball screw casting in grey cast iron EN-GJL-250 (UNI EN 1561) 55 Load capacity [kN], (push - pull) Worm gear centre distance welded steel Gear box material S355 J2 (UNI EN 10025) 120 Mass of gear box without ball screw Load capacity [kN], (push - pull) Housing side dimensions casting in grey cast iron EN-GJL-250 (UNI EN 1561) 38 Mass of gear box without ball screw

Screw jacks with travelling ball nut (Mod.B) 3.7 Ball screws and nuts technical data Ball screws produced with whirling process, accuracy grade IT 5 (1) Ball screw (1) - ball screws with accuracy grade IT 3 can be supplied on request (2) - the nut code in the table is incomplete; to complete it refer to Ch. 3.8 “B

Screw jacks with travelling ball nut (Mod.B) 3.7 Ball screws and nuts technical data Rolled ball screws, accuracy grade IT 7 Ball screw (2) - the nut code in the table is incomplete; to complete it refer to Ch. 3.8 “Ball nu

Screw jacks with travelling ball nut (Mod.B) 3.8 Ball nut dimensions Nuts with flange according to DIN 69051 Ball screw Flange type

Screw jacks with travelling ball nut (Mod.B) 3.8 Ball nut dimensions Nuts with flange at SERVOMECH drawing SERVOMECH Ball screw Flange type Flange type: 2 8 holes at 45° (d0 ≥ 40 mm) Flange type: 1 6 holes at 60° (d0 < 40 mm)

Screw jacks with travelling ball nut (Mod.B) 3.9 Ball nut life Ball screw diameter 16 - 20, accuracy grade IT 3 or IT 5 Following life diagrams refer to a constant applied load, without shocks and 90 % ball screw reliability. For different load and/or reliability conditions, please refer to ch. 1.11 “Ball screw life calculation” on page 18 or contact SERVOMECH. 10 9 8 7 6 5 4 Life in performed stroke [km]

Screw jacks with travelling ball nut (Mod.B) 3.9 Ball nut life Ball screw diameter 16 - 20, accuracy grade IT 7 Following life diagrams refer to a constant applied load, without shocks and 90 % ball screw reliability. For different load and/or reliability conditions, please refer to ch. 1.11 “Ball screw life calculation” on page 18 or contact SERVOMECH. 10 9 8 7 6 5 4 Life in performed stroke [km]

Screw jacks with travelling ball nut (Mod.B) 3.9 Ball nut life Ball screw diameter 25 - 32, accuracy grade IT 3 or IT 5 Following life diagrams refer to a constant applied load, without shocks and 90 % ball screw reliability. For different load and/or reliability conditions, please refer to ch. 1.11 “Ball screw life calculation” on page 18 or contact SERVOMECH. 25 20 Life in performed stroke [km]