Planetary gear units

Operating principle

Planetary gearboxes (PLGs) operate as their name implies: the motor-driven sun wheel is in the middle, transmitting its movement to three circumferential planet gears which form one stage. They are arranged on the bearing pins of a planet carrier. The last planet carrier in each sequence is rigidly linked to the output shaft and so ensures power transmission to the output shaft. The planet gears run within an internally toothed outer ring gear.

Properties

Input and output are co-axial. The shafts turn in the same direction. PLGs are suitable for clockwise and anti-clockwise rotation, for alternating, continuous and cyclic operation, and they excel due to their high degree of efficiency. Unlike other gear types, their compact design provides ultimate power density and excellent torque transfer in the smallest space. Their resistance to shock loads is high due to load distribution over several components (the three planetary wheels) and the support of the annular gear.

Exploded drawing P62

1. Motor pinion input side
2. Motor flange
3. Plastic planet gears (optional), Stage 1
4. Metal planet gears, Stage 1
5. Metal planet gears and planet carrier, Stage 2
6. Outer ring gear
7. Metal planet gears, Stage 3
8. Output flange
9. Ball bearing
10. Output shaft

Modular system for planetary gearboxes

Motor pinions: virtually unlimited options (Optional)

IMS planetary gears are designed for connecting any type of motor currently available using a motor pinion which is adaptable to suit various designs or using our option involving bearing mounted input shafts. With appropriate quantities and after consultations with the motor manufacturer, the motor shaft can also be intermeshed directly. With an adapted motor mounting plate the motor can then be connected to the annular wheel without any additional motor flange, allowing shorter and more cost-effective gearing assemblies.

Motor flange: to date, almost 1,400 options (Optional)

Flanges are available in plastic, die-cast zinc or aluminium in basic, standard or special versions adapted individually depending on requirements. For diameters below 42 mm and with PK 52 the motor is connected to the gear via a special flange. For larger quantities you can also obtain tool-specific special flanges, e.g. made of plastic or die-cast zinc. Type series P 52 to P 120 are also available with standard DIN 42948 flanges. In this case, we recommend designing both motor and flange according to DIN 42955-R.

Planetary gears: to date, 1,270 standard gear variants (Standard)

Seven different diameters with as many as four gear stages and a wide variety of reduction ratios ranging from 3.7:1 to 2,075.9:1 are available in plastic, metal or material mix versions with output torques ranging from 0.2 to 300 Nm.

Output flange: to date, over 1,300 options (Optional)

The output flange includes bearings. Sintered metal bearings or ball bearings can be selected to match operating requirements. Gearboxes with two RS seals in the ball bearing of the output shaft are protection class IP 53 whereas, with two Z cover disks, they are protection class IP 42. Sintered metal versions are protection class IP 00. Higher protection classes can be obtained by applying specific seals.

Output shaft: virtually unlimited adaptation options (Optional)

The output shaft is linked to the last planet carrier and can be designed in any customer specific layout depending on the machine to be driven.

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