Transtech AS

The flexible pin concept was invented over 40 years ago as a means to improve overall performance and reduce total volume in planetary gear transmission designs. With the employment of an experienced team of engineers and custom designed software, Transtech AS of Norway has further developed this concept lending to innovative designs and constructions of transmission systems with dramatically improved power ratings and longer life cycles. The key advantage to a Flex Pin system is that it allows the designer to increase the total number of planetary gears per gear train. This increases the shared load and gives the design such benefits as more torque in the same volume, or conversely, the design’s overall size can be reduced while maintaining the customer’s torque requirements. Contrary to a conventional planetary system, where planetary gear pins are rigidly fixed to the planet carrier on both sides of the gear, a Flex Pin design allows the forces to dictate the position of each individual planetary gear. The figure below on the left visualizes how a conventional planet carrier reacts when forces are dictated by a rigid pin design. The induced “torque wind up” reduces both gear life and bearing life and increases the probability of total breakdown.                       As the figure below on the right helps explain, a Flex Pin system will maintain proper gear mesh along the planet gear’s tooth faces regardless of its natural tendancy to flex.

A FEM analysis of a conventional rigid                                    The flexible pin concept under load.
pin planetary carrier under load.

Transtech AS has produced numerous custom designed transmissions using the Flex Pin design for
applications all over the world. We take our leadership in this field seriously and are constantly
working on ways to further improve it.

RECENT PROJECTS USING THE FLEX PIN DESIGN

Provoc Gear 30 pcs. Provoc Marine propulsion gear 1500 kW @ 1600 rpm, i= 4,523	Deburring Spindle 15 pcs. Deburring spindles, output speed 12 kW @ 40.000 rpm, i= 0,218
Anchor Handling Winch 20 pcs. Anchor handling winch, 2 speeds Input power 2x826 kW i= 13,6 / 27,46	Anchor Handling Winch 20 pcs. Anchor handling winch, 2 speeds Input power 2x826 kW i= 13,6 / 27,46
Winch Drive 2 pcs winch gearbox, output torque 337200 Nm 1596kW @ 130 rpm, i= 2,875	TBM Gearbox 2 pcs Tunnell boring drill gear train 50 kW @ 450 rpm output torque Output: 17361 Nm, i= 13,35
	Winch Drive w/Concial Output Shaft 8 pcs. winch gearbox Output torque 337200 Nm 1596 kW @ 130 rpm  i= 2,875

	3,4 MW Windmill Gearbox 27000 kg 1 pc Windmill gearbox Variable ratio: i= 75-107 Input speed: 14-20 rpm Constant output: 1500 rpm
Planetary gear for 25 tons winch, weight 1420 kg 12 pcs winch gearboxes, i= 4,09 max output torque 45000 Nm, 424 kW / 210 rpm	Planetary gear for 25 tons winch, weight 1420 kg 12 pcs winch gearboxes, i= 4,09 max output torque 45000 Nm, 424 kW / 210 rpm
Top drive 1 pc. 250 T Topdrive 2 x 419 kW @ 2000 rpm, i= 12	PMW-90k Gearbox for drawwork 1 pc. 2-speed gearbox for drawwork 2250 kW @ 1100 rpm, i= 3,77 / 11,43