Servomech screwjacks new ideas in linear motion - Servo Vision

1 Choose series MA for: high duty cycles higher linear speeds input speeds above1500 r/min long life oil lubricant 1, 2 or 3 start threads optional ballscrewsChoose series SJ for: lower duty cycles lower costs compact dimensions easy mounting long life greaselubricantServomech screwjacksnew ideas in linear motionConstruction and featurespages1-3 Performance summarypages4-5 Screwjack selectionpages 6-17 Ordering and specificationpages 18-19 Dimensionspages 20-23 Options and featurespages 24-32 Installation - Maintenance - Lubricantspage 33 Screwjack systemspages 34-35 screw jacks check sheetpages 36-37 SUMMARY forces from 5 kN to 350 kN speeds up to 150 mm/s maximum duty cycle 30% free shaft or

2 Motorised input ac or dc motors travelling nut or travelling screwFounded in 1989, Servomech has become a leading forceworldwide for industrial linear motion . The Servomechproduct range covers both actuators and screwjacks withmax. forces from 500 N to 350 kN. screwjacks make up theheavier end of this range with housing designs either inmonobloc aluminium or cast iron. Quality construction suitslong life in industrial applications. Copyright Servomech 2004 The contents of this catalogue are the copyright of the publisher and may not be reproduced (even extracts)unless permission is care has been taken to ensure the accuracy of the information contained in this catalogue, but no liabilitycan be accepted for any errors or 2004 8-09-2004 9:41 Pagina II1 Model A travelling screwModel B travelling nutModelsTravelling screw models operate with the screw beingdriven through the centre of the wormwheel.

3 In operation,the screw does not rotate. Space must be available for thescrew to protrude below the gearhousing when in a fullyclosed options: protective tubebellowssafety bronze nutstop nutwear indicator switchvariable screw end fixingslimit switchesstainless steel acme screwtrunnion mountinganti-turn deviceTravelling nut models have the screw fixed to thewormwheel. In operation the screw rotates with thewormwheel, driving the nut up and down. Overalldimensions for this combination remain options: safety travelling nutbellowswear indicator switchstainless steel acme screwtrunnion mounting travelling nutServomech ScrewjacksFor both SJ and MA screwjacks there is a choicebetween two models:Model Atravelling screwModel Btravelling nutYour choice here depends on the configuration of theapplication, also the options required.

4 Performance isthe same for both screwjacks can be operated in vertical orhorizontal planes, or angles in-between. Input optionsare male shaft, motor flange or second 2004 9-09-2004 10:56 Pagina 12SJ screwjacksAttractive low cost screw jacks series Long life grease lubricant for worm gear Compact monobloc housing, cubic design,for high static load capacity Acme screws two or three start threads available Wide range of input versions and accessories availableAluminium bronze travelling nutfor long lifeC43 steel for long life andincreased strengthGuide bush top and bottom asstandard to resist radial loads onacme thread and gearingincreasing efficiency.

5 Also usedto mount involute hardenedand ground steel wormWide range of gear ratiosfor optimal solutionsGearhousingsgrease-filled for monoblochousing for simplemountingTapped mounting holes top andbottom, alternative throughholes, for ease of mountingTrue involute bronzeworm wheel for longlife and efficiencyincreasedScrew fixed to wormwheel by opposingthreads and pinned for increased safetyExampleSJ model Btravelling nutScrewjack 2004 9-09-2004 10:56 Pagina 23MA screwjacksHigh efficiency screw jacks series Long life oil lubricant for worm gear Modern gear housing design for heat dissipation High efficiency allowing high speed and high duty applications Ballscrews and two, three or four start threads available Extensive range of options features and accessoriesC43 for long life and increased start threads as standard,two.

6 Three or four start threadsand ballscrews available on requestRibbed housingallows effective heatdissipation givingincreased dutyTrue involute worm and wheelfor higher efficiencyLong bronze wormwheel forincreased rigidity, duty, lifeand efficiencyOil lubricated for betterheat dissipation, allowinghigher input speeds andgiving a longer life andincreased efficiencyDuty cyclesLimits of 20% and 30% relate tooperation with maximum duty cycles can be achievedwith lower forces, ask for thrust bearings forgreater load capacities Optional raised cover for increasedguiding against radial load, andother options.

7 May also be used asa tolerance location protective tube allowsfitting of limit switchesExampleMA model Atravelling screwScrewjack 2004 9-09-2004 10:56 Pagina 34SJ screwjacksSeries SJ Technical SpecificationStandard performances screw jacks series Load capacity ranging from 5 kN to 200 kN linear speed up to 40 mm/s (up to 100 mm/s on request) Input speed up to 1500 r/min Operating duty cycle up to 30% over a 10 minute period, or20% over a 1 hour period, at 25 C environment temperatureSIZESJ 5SJ 10SJ 25SJ 50SJ 80SJ 200 Max lifting loadkN510255080200 Acme lift screw dia pitchTr 18 4Tr 22 5Tr 30 6Tr 40 7Tr 55 9Tr 70 12Tr 80 12RH1 : 4 AvailableRV1 : : 41 : 61.

8 71 : 71 : 7ratiosRN1 : : 161 : 181 : 141 : 14 RL1 : 251 : 241 : 241 : 281 : 281 : 28RH1 Stroke [mm] input Max power [kW] Max starting at full [Nm] Starting Running 1500 torque ofscrew at max load [Nm]8206516536811801300 Housing materialAluminium alloyCast ironEN 1706 - AC-AlSi10Mg T6EN 1561 - GJL-250 Weight without screwand protection tube [kg] for every100 mm of screw [kg] figures at other speeds on page 9 Performance summaryScrewjack 2004 9-09-2004 10:56 Pagina 45MA screwjacksSIZEMA 5MA 10MA 25MA 50 MA 80 MA 100 MA 200 MA 350 Max lifting loadkN510255080100200350 Acme lift screw dia pitchTr 18 4Tr 22 5Tr 30 6Tr 40 7 Tr 55 9Tr 60 12Tr 70 12 Tr 100 16RV1 : 41 : 51 : 61 : 71 : 71 : 81 : 83 : 32 RatioRN1 : 161 : 201 : 181 : 141 : 141 : 241 : 241 : 16RL1 : 241 : 251 : 241 : 281 : 281 : 321 : 321.

9 32 Stroke [mm] input power [kW] starting at full [Nm] 1500 torque ofscrew at max load [Nm]8206516536852511802880 Housing materialAluminium alloySpheroidal graphite ironEN 1706 - AC-AlSi10Mg T6EN 1563 - GJS-500-7 Weight without screwand protection tube [kg] for every100 mm of screw [kg] figures at other speeds on page 12 series MA Technical SpecificationPerformance summaryHigh perfomances screw jacks series Load capacity ranging from 5 kN to 350 kN linear speed up to 75mm/s (up to 150mm/s on request) Input speed up to 3000 r/min Operating duty cycle up to 40% over a 10 minute period,or 30% over a 1 hour period,at 25 C environment temperature High duty cycle up to 100% for continous performanceswith ball screw optionScrewjack 2004 9-09-2004 10.

10 56 Pagina 56 Screwjack selectionOur screwjack engineers are happy to makeselections for your given full application dataStep1 Step2 Step3 Step4 Step5 Step6 Step7 Step8 Step9 Choose between series SJ andMA based on those maximumperformance speedmm/s40150 Duty cycle%2030 Input speedr/min15003000 Data required: Load, in kN Length of screw Mounting detailsThree mounting possibilities: unguidedpage 13 semi-guidedpage 14 fully guidedpage 15 Note the ratio: RH very low RV low (high speed) RN medium RL high (low speed)If motorised, the input speed isnormally 1500 r/min although 900 r/min is possible.