Patent application EP17172902A (EP), filed 2017-05-24
Publication number: EP3255314A1
Title: PLANETARY GEARSETS
Abstract: A method for designing a planetary gearset meeting one or more design targets is described. Initially, a size and ratio of the planetary gear set, and the number of planet gears for the planetary gearset is specified. All valid combinations of tooth numbers and planet numbers that satisfy one or more constraints are then calculated. From these, a starting combination is selected and a value for a design target for the gear set is calculated. One or more of the macro-geometry parameters are modified, and the macrogeometry parameters are chosen such that the positive effects of one macrogeometry parameter on the design target counteract any negative effects of another macrogeometry parameter. In this way, a design for planetary gearset meeting the one or more design targets is produced. Also disclosed is a method additionally calculating a sideband distribution resulting from the selected combination. The side band distribution is compared with a design target for sideband distribution and parameters are varied as necessary to achieve the required design.
IPC codes: F16H  57/    00            A I
G06F  17/    50            A I
Claims: number: 1
text: A computer-implemented method for designing a planetary gearset meeting one or more design targets, said method comprising the following steps:
number: 2
text: A method of claim 1, in which the step of selecting a starting combination comprises selecting a starting combination having a small module and a large number of teeth.
number: 3
text: A method of claim 1 or claim 2, in which the design target is for bending strength, step f) comprising:
number: 4
text: A method of any preceding claim, in which the macrogeometry parameter is module, step f) comprising:
number: 5
text: A method of any preceding claim additionally comprising the step of modifying one or more micro-geometry parameters, in which one or more of the following micro-geometry parameters is modified:
number: 6
text: A method of claim 5, in which the micro-geometry parameters are optimised by using the Design of Experiments method, which can be automated in computer implementations to identify all permutations possible within user-specified tolerances, and determine the effects on design targets in order for the user to select an optimum micro-geometry design based on a weighted combination of one or more design targets.
number: 7
text: A method of any preceding claim comprising the additional steps of:
number: 8
text: A method of claim 7, in which the step of calculating the sideband distribution includes using run out/assembly errors and transmission error; or
using mesh misalignment and transmission error using loaded tooth contact analysis, in which mesh misalignment includes one or more the following factors:
number: 9
text: A method of claim 8, further comprising: calculating an extent to which high radiated noise is caused by an error.
number: 10
text: A method of claim 7, in which the planetary gearset is part of a machine, and the sideband distribution includes a frequency that is a known resonance in the machine.
number: 11
text: A method of claim 7, additionally comprising the steps of:
number: 12
text: A method of any preceding claim, in which lubricant test data is integrated into an efficiency calculation using loaded tooth contact analysis.
number: 13
text: A method of any preceding claim, in which the step of specifying a size and ratio comprises specifying a packaging space and calculating size from a ratio, torque capacity, face width and a constant.
number: 14
text: A non-transitory computer readable storage medium encoded with instructions that, when executed by a processor, perform the steps of the method according to any preceding claim.
number: 15
text: A machine including a planetary gearset designed according to the method of any of claims 1 to 13.
Office action: search_report, dated 2017-12-13
Prior art cited: ref_id: US2013085722A1
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severity: background
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severity: background
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ref_type: npl
severity: background
ref_id: - NADEL B A ET AL, "AUTOMOBILE TRANSMISSION DESIGN AS A CONSTRAINT SATISFACTION PROBLEM: MODELLING THE KINEMATIC LEVEL", ARTIFICIAL INTELLIGENCE FOR ENGINEERING DESIGN, ANALYSIS ANDMANUFACTURING, LONDON, GB, (19910101), vol. 5, no. 3, pages 137 - 171, XP008032722 [I] 1-15 * page  165  - page  166 *
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severity: background
ref_id: - Bernhard-Robert Höhn ET AL, "Low Loss Gears", Gear Technolgy June 2007, (20071231), URL: http://s3.amazonaws.com/zanran_storage/www.geartechnology.com/ContentPages/16895532.pdf, (20171107), XP055422280 [AD] 1-15 * the whole document *
ref_type: npl
severity: background
ref_id: - MAGALHAES L ET AL, "Influence of tooth profile and oil formulation on gear power loss", TRIBOLOGY INTERNATIONAL, ELSEVIER, AMSTERDAM, NL, vol. 43, no. 10, ISSN 0301-679X, (20101001), pages 1861 - 1871, (20091012), XP027195740 [AD] 1-15 * the whole document *
ref_type: npl
severity: background
ref_id: - Hermann Stadtfeld ET AL, "Operation Pressure Angle", Gear Technolgy 2013, (20131231), URL: https://www.geartechnology.com/issues/0513x/operating-pressure-angle.pdf, (20171107), XP055422277 [AD] 1-15 * the whole document *
ref_type: npl
severity: background
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ref_type: npl
severity: background
Final disposition: pending (2017-12-13)