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Research Papers

A New Method to Measure Planet Load Sharing and Sun Gear Radial Orbit of Planetary Gear Sets

[+] Author and Article Information
B. Boguski

A. Kahraman1

 The Ohio State University, Columbus, OH 43210kahraman.1@osu.edu Mazda Motor Corporation, Hiroshima 730-8670, Japankahraman.1@osu.edu

T. Nishino

 The Ohio State University, Columbus, OH 43210nishino.t@mazda.co.jp Mazda Motor Corporation, Hiroshima 730-8670, Japannishino.t@mazda.co.jp

1

Corresponding author.

J. Mech. Des 134(7), 071002 (Jun 08, 2012) (8 pages) doi:10.1115/1.4006827 History: Received January 12, 2011; Accepted March 08, 2012; Published June 07, 2012; Online June 08, 2012

A new method of measuring planet load sharing of planetary gear sets is proposed in this paper. The method uses strain gauges mounted directly on the planet pins to measure continuously the loads carried by the planets assembled in a fixed carrier. Example 4-planet gear sets of different planet phasing conditions are procured and tested with a family of planet carriers having various levels and combinations of planet pinhole position errors to demonstrate the measurement method. As the radial floating capability of the central members is critical to planet-to-planet load sharing, a companion proximity-probe based measurement system is also implemented to measure the radial motions of the floating sun gear under various planet phasing and carrier pinhole error conditions. It is shown that both measurement methods are effective in characterizing the loads carried by planets.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 2

(a) A close-up picture of the planetary gear test fixtures in the planet load sharing measurement configuration and (b) the cross-sectional view of fixtures used in the planet load sharing measurements (input: sun gear, fixed: carrier, and output: ring gear)

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Figure 3

(a) A close-up picture of the planetary gear test fixtures in the sun gear orbit measurement configuration, and (b) the cross-sectional view of fixtures used in the sun gear orbit measurements (input: sun gear, fixed: ring gear, and output: carrier)

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Figure 4

Pin instrumentation details and strain gauge locations

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Figure 8

Schematic showing positive directions of tangential hole position errors and theoretical carrier errors used for the planet load share and sun gear orbit tests

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Figure 9

Measured LSFn values from (a) the in-phase gear set, (b) the sequentially phased gear set, and (c) the counterphased gear set as a function of the input torque. Carrier #5 with Eeff=81  μm was used in these tests.

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Figure 10

Measured LSFn values from the in-phase gear set with (a) carrier #1 having Eeff=5  μm, (b) carrier #2 having Eeff=39  μm, (c) carrier #3 having Eeff=80  μm, (d) carrier #4 having Eeff=45  μm, and (e) carrier #5 having Eeff=81  μm

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Figure 11

The measured LSFn values as a function of Eeff values at the sun gear torque values of (a) 40 Nm, (b) 100 Nm, and (c) 160 Nm. The in-phase gear set was used in these tests.

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Figure 12

Measured sun gear orbits of (a) the in-phase gear set, (b) the sequentially phased gear set, and (c) the counterphased gear set with carrier #1 having Eeff=5  μm at 60 Nm

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Figure 13

Measured sun gear orbits of (a) the in-phase gear set, (b) the sequentially phased gear set, and (c) the counterphased gear set with carrier #5 having Eeff=81  μm at 60 Nm

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Figure 1

(a) The planetary test machine used in this study, and (b) the schematic of the layout showing its main components

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Figure 7

Schematic detail of proximity probe placement for the sun gear orbit study

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Figure 6

An example 90-s segment of load sharing stress data taken from an in-phase gear set

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Figure 5

A test carrier assembly and the components of a planet bearing system

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