ACE

118 Issue7.2014 Specifications subject to change 118 ACE Controls Inc. · Tel. 800-521-3320 · (248) 476-0213 · Fax (248) 476-2470 · E-mail: shocks@acecontrols.com · www.acecontrols.com Filling tolerance: ±7%. Effect of temperature: An increase in temperatureof each18 °F will increase forceby approx. 3.4%. Temperature range: -4 °F to176 °F– special seals from -49 °F to 392 °F. Mounting: Thegas springs should ideally be installedwith the piston rodpointingdownwards touse theenddampingduring theextension stroke to smoothly decelerate themotionof thegas spring. SomeACE gas springs have auniquely designed front bearingwith an integrated grease chamber allowing thegas spring tobemounted andoperated in any position if required. Whenfitting thegasspringsensure that thestroke is fully extended (GZ type fullycompressed) , thismakes assembly and disassemblymucheasier. Support themovingmass/flapduring assemblyor disassembly toprevent accidents. Toavoid twisting orside loading, it is recommended thatball jointsorotherpivoted mountingattachmentsareused. Themountingattachmentsmust alwaysbesecurely tightenedonto the threadedstudsof thegasspring. Gasspringsareuniversallyaccepted , wherever youwant to • push • pull • lift • lower, or • position covers, lids or other componentsby hand without using anexternal energy source. ACEgas springs are individually filled to a predeterminedpressure to suit a custom- er’s requirement (extensionForceF 1 ). The cross-sectional areaof thepiston rod and fillingpressuredetermines theextension forceF=p*A. During the compressionof thepiston rod, nitrogen flows through an orifice in thepiston from the full bore side of thepiston to the annulus. Thenitrogen is compressedby the volumeof thepiston rod. As thepiston rod is compressed the pressure increases, so increasing the reaction force (progression). The force depends on theproportional relationship between thepiston rod and the inner tube diameter, which is approximately linear. ACEgas springs aremaintenance-free. DONOToil or grease thepiston rod! Thepiston rodmust beprotected from any hits, scratches or dirt and especially paint. Damage to the surface finishof thepiston rodwill destroy the sealing system and cause loss of pressure. Theouter body must not bedeformedormechanically damaged. ACEgas springs canbe stored in any position. Experiencehas shown that long storageperiods donot result in loss of pressure. However you may experience some “stiction” requiring ahigher effort tomove thegas spring for the first time after a long storageperiod. Generally, ACEgas springs are tested to70,000 to100,000 complete strokes. This is equivalent to the seal lifetime (dependingonmodel size) to adistance travelledof 6.21miles– for lifetimeof tractiongas springs seepages150 to161. During these tests thegas springmust not lose more than5%of its pressure. Dependingupon the application and operatingenvironment, the service lifeof thesegas springsmay be much longer. Inpractice500000 strokes ormorehavebeen achieved on some applications. OutwardStroke InwardStroke Spring force lbs (N) Total Stroke inches (mm) Stroke inch (mm) 0.20 (5) 0.20 (5) F 3 F 4 F 2 F 1 F R extension 0.20 (5) 0.20 (5) F 3 Stroke inch (mm) compression Total Stroke inches (mm) Spring force lbs (N) F 4 F 2 F 1 F R F 1 =nominal forceat 68 °F– this is the forcefigurenormallyusedwhenspecifying thegasspring F 2 = force in the complete compressedposition F 1 =nominal forceat 68 °F– this is the forcefigurenormallyusedwhenspecifying thegasspring F 2 = force in the completeextendedposition When extending the piston rod, there is an additional friction force caused by the contact pressure of the seals (this only occurs during the extension stroke) F R F 3 = force at the beginning of the extension stroke F 4 = force at the end of the extension stroke When compressing the piston rod, there is an additional friction force caused by the contact pressure of the seals (this only occurs during the compression stroke) F R F 3 = force at the beginning of the compression stroke F 4 = force at the end of the compression stroke Force-StrokeCharacteristicsofGasSpring (PushType) Force-StrokeCharacteristicsof TractionGasSpring (Pull Type) ServiceLife IndustrialGasSprings Function, Calculation andMounting Tips GasSprings (PushType) Type 1 Progression approx. % 2 Friction F R approx. lbs (N) GS-8 28 2.25 (10) GS-10 20 2.25 (10) GS-12 25 4.50 (20) GS-15 27 4.50 (20) GS-19 26 - 39 3 6.74 (30) GS-22 30 - 40 3 6.74 (30) GS-28 58 - 67 3 8.99 (40) GS-40 37 - 49 3 11.24 (50) GS-70 25 11.24 (50) GasSprings (Pull Type) Type 1 Progression approx. % 2 Friction F R approx. lbs (N) GZ-15 23 12.36 (55) - 31.47 (140) GZ-19 10 4.50 (20) - 8.99 (40) GZ-28 20 22.48 (100) - 44.96 (200) GZ-40 40 1 Theprogression (the slope of the force line in the diagrams above) is due to the reduction of the internal gas volume as the piston rodmoves from its initial position to its fully strokedposition. The approx. progression values given above for standard springs canbe alteredon request. Effect of temperature: The nominal F 1 figure is given at 68 °F. An increase of 18 °Fwill increase force by 3.4%. Filling toleranceonF 1 force: ±7%. 2 Depending on the filling force. 3 Depending on the stroke.