STUDY ON HIGH-SPEED TRACTION DRIVE CVT FOR AIRCRAFT POWER GENERATION

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  • Study on high-speed traction drive CVT for aircraft power generation - Gyroscopic effect of the thrust ball bearing on the CVT -
  • - GYROSCOPIC EFFECT OF THE THRUST BALL BEARING ON THE CVT -

Description

<p>The traction drive - integrated drive generator (T-IDG®) has been developed since 1999 to replace current hydrostatic transmission drive generators mounted on Japanese military aircrafts. The T-IDG® consists of a generator and a half-toroidal traction-drive continuously variable transmission (CVT), which maintains a constant output speed of 24,000 rpm. In terms of coping with recent trends of high-power electric drive aircraft (MEA) and the need for weight reduction, a high-speed traction-drive CVT is advantageous over current hydro-static drive transmissions. The high-speed half-toroidal CVT has a fundamental issue regarding the thrust ball bearing, which must support a large loading force at a high rotational speed. This paper describes the gyroscopic effect of this thrust ball bearing on the T-CVT up to 20,000 rpm with a peripheral speed of the traction contact of 70 m/s.</p>

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