Worm gearboxes
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Product Catalogue Miniature bevel gearboxes Bevel gearboxes Hypoid gearboxes Worm gearboxes Gearbox motors Special gearboxes ATEX gearboxes Gear sets Service Service Servo gearboxes (precision gearboxes) hypoid gearboxes Hygiene-design gearboxes

9.1 Type overview Gear ratios: i = 05:1 to 83:1 Maximum output torque: 13720 Nm 9 sizes, centre-to-centre distance of 040 to 250 mm Low-backlash construction < 6 angular minutes possible Housing made of grey cast iron Type S – Standard worm gearboxes Gear ratios: i = 05:1 to 83:1 Maximum output torque: 13720 Nm 9 sizes, centre-to-centre distance of 040 to 250 mm Low-backlash construction < 6 angular minutes possible Suitable for fitting IEC standard motors Drive side with hollow-bored shaft and flange Housing made of grey cast iron Type SL – Type S with flange for motor mounting Double worm...

Due to its mode of operation, a worm gearbox enables high step-down ratios. In worm gearboxes, both shafts intersect in a defined distance (A). This centre-to-centre distance is reflected in the specification of the gearbox size. (Example: S 100 - centre-to-centre distance 100 mm) 9.2.1 Toothing A gear set consists of worm shaft and worm gear. The worm shaft made of carburised steel is hardened, the toothing is ground. The worm gear consists of a high-quality bronze alloy, the toothing is milled. 9.2.2 Construction types Due to the modular system, different gearbox construction types can be...

9.2.6 Rotational direction and gear ratio As standard, the worm gearboxes are delivered with right-handed worm shafts. This results in rotational directions according to Figure 8.2.5-1. In the special design, delivery with left-handed gear teeth is also possible. Please enquire this. Please refer to the performance tables for the possible gear ratios. Principally, the actual gear ratio iist must be taken into account for the layout. In some cases, this deviates from the nominal gear ratio i. The achievable efficiency depends on rotational speed, torque, installation position, sealing, and...

The worm gearboxes are factory-filled with synthetic polyglycol oil and are normally maintenance-free. In case of very low rotational speeds, lubrication by fluid grease is also possible. Table 9.2.8-1 At operating temperatures over 50°C, high pressure will develop through air expansion in the gearbox. Then a permanent pressure compensation must be ensured. To this end, the use of a vent filter is prescribed. 9.2.9 Vent filter If venting is required the gearboxes will be delivered with a vent filter. The vent bores will be equipped with screw plugs for transport. The vent filter will be...

9.2.10 Low-backlash construction For optimal running, the tooth space in the gear set is manufactured larger than the tooth. When the direction of rotation is changed, this results in a rotation angle until the counter-rotating tooth flanks contact each other. This rotation angle is called circumferential backlash. Circumferential backlash, measuring method The circumferential backlash is measured after the drive shaft (Nx) has been fixed. A force of around 2% of the nominal torque is applied to the output shaft (N2) in both rotational directions. A tooth backlash will result between the...

Dynamic self-locking Worm gearboxes are dynamically self-locking if, with rotating gearbox mechanism, continued operation is impossible due to torque action on the worm gear (output side) of the gearbox. The overrun occurring after switching-off depends on the rotating masses on the drive side. Dynamic self-locking is only possible with very large gear ratios in the range of low driving speeds. Please enquire these. If driven parts have high mass inertia moments no self-locking must occur during the run-down process. Extremely high load peaks may occur in case of sudden blocking of the...

Nominal gear ratios: i = 05:1 to 83:1 Maximum output torque: 13,720 Nm 8 sizes, centre-to-centre distance of 040 to 250 mm Low-backlash construction < 6 angular minutes possible Housing made of grey cast iron 9.3.2 Models 9.3.3 Gearbox sides The example shows the Model B0 Figure 9.3.3-1; Gearbox sides The order code reflects the customer specifications. Example: Centre-to-centre distance A; Table 9.3.5-1 Gearbox side on which fixing is made Table 9.2.3-1 Figure 4.3.1-1; Gearbox sides Side directed downwards Figure 4.3.1-1; Gearbox sides Slowly rotating shaft; Table 9.3.5-1

9.3.5 Overview of performance data n1 Worm gearboxes

Worm gearboxes

9.3.6 Type S 040 – Standard worm gearboxes Characteristics Characteristic Hardened and ground worm shaft / bronze worm gear Gear ratio Housing / Flanges Grey cast iron Threaded mounting hole On gearbox side 1 and on the flanges Material 1 C45, shaft ends greased Fit with ISO j6 tolerance with parallel keyway: according to DIN 6885 Sheet 1 Hollow shaft Material 1 C45, shafts greased Fit with ISO H7 tolerance with parallel keyway: according to DIN 6885 Sheet 1 Radial shaft seal ring Ambient temperature - 10°C to +90°C. The values of the performance tables are valid for 20°C Circumferential...

Permissible radial force Fri and axial force Fai on shaft Ni Permissible radial force Fr2 and axial force Fa2 on shaft N2 < 80 970 485 1250 625 1380 690 1600 800 1800 900 2500 1250 Inertia moments/mass Inertia moment J1 related to the fast-rotating shaft (Ni) The mass of the gearbox may deviate depending on the gear ratio and the type.

9.3.6 Type S 040 – Standard worm gearboxes Model B0 The dimensions of the Models not shown can be figured by mirroring available dimensions.

Worm gearboxes Contour ofder Gegenwelle Kontur the countershaft

9.3.7 Type S 050 – Standard worm gearboxes Characteristics Characteristic Hardened and ground worm shaft / bronze worm gear Gear ratio Housing / Flanges Grey cast iron Threaded mounting hole On gearbox side 1 and on the flanges Material 1 C45, shaft ends greased Fit with ISO j6 tolerance with parallel keyway: according to DIN 6885 Sheet 1 Hollow shaft Material 1 C45, shafts greased Fit with ISO H7 tolerance with parallel keyway: according to DIN 6885 Sheet 1 Radial shaft seal ring Ambient temperature - 10°C to +90°C. The values of the performance tables are valid for 20°C Circumferential...