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LOW WEIGHT GEARBOX CARRIER FOR WIND TURBINE

IP.com Disclosure Number: IPCOM000235688D
Publication Date: 2014-Mar-20
Document File: 9 page(s) / 5M

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique for providing low weight wind turbine gearbox with maintained stiffness. The technique includes structural optimization of planet carrier. Software determines a material which is required to support a boundary and load constraints.

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LOW WEIGHT GEARBOX CARRIER FOR WIND TURBINE

BRIEF ABSTRACT

The invention proposes a technique for providing low weight wind turbine gearbox with maintained stiffness. The technique includes structural optimization of planet carrier. Software determines a material which is required to support a boundary and load constraints.

 

KEYWORDS

Wind turbine, gearbox, structural optimization, planet carrier, planets, bearing.

DETAILED DESCRIPTION

A wind turbine uses a gearbox. The gearbox is used to increase rotational speed from a low-speed rotor to a higher speed electrical generator.

FIGURE 1 depicts a typical mechanism of a simple epicyclic gearbox. There are three types of epicyclic gearboxes. One of them is a star type gearbox. A planet carrier is fixed in the star type gearbox. An input torque or speed is attained through a sun shaft, and an output torque or speed is attained through a ring gear and vice versa. Another type is a planetary type gearbox. A ring gear is fixed in the planetary type gearbox. The input torque or speed is attained through the sun shaft, and the output torque or speed is attained through a planet carrier shaft and vice versa. One other type is a differential type gearbox. The ring gear, the planet carrier and the sun gear are unconstrained in differential type gearbox. When the input torque or speed is supplied through the sun gear, the ring gear and the planet carrier operate in opposite directions. The corresponding torque or speed is dependent on a gear teeth count.

As depicted in FIGURE 2 and FIGURE 3, the ring gear is fixed in the planetary type gearbox. The planet carrier is a component which holds planets and planet pins in place .The planet carrier is required to be sufficiently stiff to prevent the planets from becoming misaligned under the loads. When the torque is applied to the sun gear, the ring gear is stationary. The planet gear rotates about the center of the planet gear as well as the center of the sun gear. The planet carrier rotates in same direction as rotation of the sun gear.

 

In an ideal situation, the planet pin centerline is parallel to the planet bore centerline, optimum operation of the bearing is provided, and operating stress of the planet bore or pin is minimized.

FIGURE 4 depicts a structural optimization. The structural optimization is a technique applied to the structure. The structural optimization finds an optimum amount of material to carry the load while maintaining stiffness and minimizing mass.

A conventional technique includes a planet carrier. The planet carrier has a member which is resistant to buckling caused by torsional stress. The member increases a torsional stiffness of the planet carrier.  A torsional load is transmitted evenly from an input member into the planet pins without twisting the planet carrier.

One of the other conventional techniques relates to planet carrier. The planet carrier is used in the planetary gear system. The planet carrier has a plurality of openi...