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| | | Ambient Conditions | | |
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| | | The UNIVERSAL worm gear unit series is suitable for installing in enclosed rooms and outdoors because of the corrosion resistance of the aluminium surfaces. Avoid allowing contact with aggressive mediums or corrosive substances (contaminated air, gases, acids, alkaline solution, salts, etc.). A colour coating is available in these cases at additional cost. Please ask us. | | The NORD UNIVERSAL worm gear unit series is suitable for ambient temperatures of -25° to 40°C. Please note that at low temperatures, increased torque is required at start up because the lubrication has toughened. | | |
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| | | Self-Locking | | |
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| | | Self-locking and self-braking with worm gear units is dependent on the gear ratio: | | |
| | | During self-locking also when the torque is so large on the output (worm gear), the idling gears cannot turn in either direction when the motor is shut off. When the motor is turned off, the drive inevitablycomes to a stop with self-locking in operation and when the self-braking is specified. | | |
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| | | | | | | | | | | | Self-locking with UNIVERSAL Worm Gear Units | | | | isch = 5-10 | isch = 12.5-40 | isch =50-80 | isch = 100 | | | | no self-locking | no reliable information on self-locking | self-locking while idling and during zero vibration | self-locking | | | | no self-braking | no self-braking | no reliable information on self-braking | self-braking with SK 1SI 31 SK 1SI40 SK 1SI 50 and n1<1500min-1 | | | | | | | | | | | |
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| | | With a mass acceleration factor of maf > 1 (see the section Selecting a Gear Unit - page 12) self-locking can cause an abrupt locking or chatter vibration during a reverse load in motor-braking (see VDI 2158). A non-self-locking gear unit should be chosen in this situation. | | |
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| | | Lateral Forces and Axial Loads | | |
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| | | The hollow output shaft is stored in unusuallyoversized ball bearings with UNIVERSAL worm gear units. Because of this, the UNIVERSAL worm gear units are suitable to attach on the output end for lateral forces and axial loads also. | | |
| | | The selection lists show the permissible Fr and Frf lateral forces which can load the output shafts in addition to the M2 torques. The transmission of force at the middle of the shaft ends of the insert shafts is used as the basis for calculating the values of the lateral forces. The values Fr applyto the insert shafts 60393000, 60493000, 60593000, 60693000, 60793000, 60393100, 60493100, 60593100, 60693100, 60793100. The values Frf applyto the flange-mounted design long insert shafts 60393200, 60493200, 60593200, 60693200, 60793200. During a midwayradical force acting on the hollow shaft, the permissible lateral force is 2xFr. The calculation of permissible lateral forces is based on the worst possible direction of force and takes into account the gear unit bearing, the gear unit housing and the insert shaft. | | |
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| | | | | | | | | | | | | Permitted Axial Load FA [N] | | | | SK 1SI 31 | SK 1SI 40 | SK 1SI 50 | SK 1SI 63 | SK 1SI 75 | | | | 1800 N | 3200 N | 4800 N | 6300 N | 8000 N | | | | | | | | | | | | |
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| | | The permissible amount of lateral force working at the middle of the shaft ends on a drive shaft of the free drive shaft module - type W is 1200N (order no. 60494200) or 1500N (order no. 60794200). | | |
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| | | Dimensions and Weight | | |
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| | | Notes on Dimension Sheets on Pages 54 to 68: • Threaded holes on shaft ends: DIN 332, Page 2 • Keyways: DIN 332, Page 1 • Flange centering: H7 and j6 • Tolerances of flange hole diameter: DIN 42948 | | |
| | | The to-scale dimension sheets and CAD-sketches of the drive as a whole is available online at the NORD homepage www.nord.com. In addition, there is the CD-ROM "NordPAC" with which you can easilycreate dimension sheets and sketches. We will gladlyfulfill your CD-ROM created request. | | |
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| | | | | | | | | | | | | Weight of Worm Gear Unit Module | | | | SK 1SI 31 | SK 1SI 40 | SK 1SI 50 | SK 1SI 63 | SK 1SI 75 | | | | 1.3 kg | 2.4 kg | 4.1 kg | 7.6 kg | 12 kg | | | | | | | | | | | | |
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| | | G 1035 www.nord.com 11 | | |
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