SEVEN LINKAGES FOR TRANSPORT

In this design a rotary action is used. The shafts D rotate in unison and also support the main moving member. The shafts are carried in the frame of the machine and can be connected by either a link, a chain and sprocket, or by an intermediate idler gear between two equal gears keyed on the shafts. The rail A-A is fixed rigidly on the machine. A pressure or friction plate can hold the material against the top of the rail and prevent any movement during the period of rest.


Same system animated:

Coupled Planetary drives series

With this new entry, I will try to cover 4 ways to use coupled planetary drives.
The first one is a double planetary drive where the input shaft provides turning capacity to the ring. This one and the input gear of the second planetary stage are coupled. Becouse of that, the input gear turns in opposite direction comparing the first input gear. In this second stage the ring is fixed, therefore the carrier turns at same direcction than input gear two.
We might consider that both carriers are fixed, the last one provides the torque and the first one the initial turning direction.

Gear scheme:


Turning directions:



Image 1:



Image 2( Rear view):



Same system, different application:



References:
Mechanism and Mechanical Devices Sourcebook
Images: Vergara

541.6 RATIO DRIVE

This missile silo cover drive, turned into a double planetary drive has a input-output ratio of 541,6.
The input gear with z=9 would need to be driven by a high speed engine.

Exploded view.

Finally, that's the ratio equation used for this application:



References:
Mechanism & mechanical devices sourcebook
Images:
Desgined and created by Vergara

SIMPLE PLANETARIES AND INVERIONS

Epicyclic gearing or planetary gearing is a gear system that consists of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically, the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear. Epicyclic gearing systems may also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears.


This table could summarize the ratio calculation of a simple planetary system and one gear inversor system:


Planetary drives are usually demanded on transmissions where the input-output ratio is very high. Also these type of transmission can be developed in a small volume. In some final drives, using a double planetary system ratios of 1:26 can be obtained.



Planetary system and Inversor system images and animations.

References:
Wikipedia
Mechanism & Mechanical Devices Sourcebook

Images and Animations by:
Vergara.