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Gearing with error compensation for precision mechanisms

A timer and gear technology, applied to the adjustment of gear sets, gear mechanisms, components with teeth, etc., can solve problems such as static charge generation and degassing problems

Active Publication Date: 2007-01-17
ROLEX SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This material can also cause outgassing issues, can generate static charges, and can cause washing bath resistance issues

Method used

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  • Gearing with error compensation for precision mechanisms
  • Gearing with error compensation for precision mechanisms
  • Gearing with error compensation for precision mechanisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 The diagram shows the time α in the gear assembly as 1 (t) affects angular displacement transmission as a function of time ω 1 (t) affects the transmission of angular velocity and as a function of time M 1 The function of (t) affects several parameters of torque transmission. These effects come from the system itself and include imperfections of the gears, including those of their toothings. Defects particularly mentioned are roundness distortion, eccentricity, inclination of the shaft, variations in ring gear penetration due to variations in center-to-center spacing, rotational play in bearings, wear, twisted teeth and lubricant aging. These influences also originate from external factors such as shock and vibration, dust, gravity and temperature changes.

[0030] The angular displacement α relative to the driven moving part if the sum of all potential defects within accepted tolerances is considered 2 The angular displacement of the driving moving part ...

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Abstract

In such a defect-compensating gear assembly for a chronograph mechanism, wherein at least some of the evenly distributed teeth of at least one mating toothed moving part have elastically deformable regions in the direction of their respective thicknesses, the meshing of said moving part The teeth have at least two simultaneous points of contact, the increase in the nominal thickness (eSJ, e2) of the teeth in contact with said respective mating moving parts, measured along the pitch circles (C1, C2) of these mating moving parts, gives the ratio The pitch (P) of these toothed moving parts is greater in length as a result. The thickness of the elastically deformable region extends on either side of the theoretical profile of the tooth.

Description

technical field [0001] The invention relates to a defect-compensating gear assembly for a chronograph or timepiece, wherein: at least some of the evenly distributed teeth of at least one of the paired toothed moving parts have elastically deformable regions along their respective thickness directions, The toothing of the moving part has at least two simultaneous points of contact. Background technique [0002] Various backlash compensating gear assemblies of the type described above have been proposed for various types of mechanisms. This is especially the case of JP63 130961A, US4 127 041 and EP1 380 772. [0003] Gear assemblies most often have some backlash to allow for all tolerances, which must affect the meshing; otherwise, alternatives such as "Théorie" published by Chambre Suisse de l'Horlogerie [Swiss Chamber of Horology], La Chaux-de-Fonds (Switzerland) can be chosen. Générale del'Horlogerie” [General Theory of Horology] L.Defossez, 1950, first volume, p.210 conf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B13/02F16H55/16
CPCF16H55/16G04B13/00F16H55/18G04B35/00Y10T74/19898
Inventor 杰罗姆·都优特
Owner ROLEX SA
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