Chain or belt drive with multiple sprockets or pulleys with non-predominant order

NPO sprockets with unique radial variation patterns address the issues of noise and tension fluctuations in chain drives by using multiple sprockets with non-predominant sequences, reducing noise and maintaining tension within acceptable limits.

DE102023134674B4Active Publication Date: 2026-07-02BORGWARNER INC
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Patent Information

Application Number
DE102023134674
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-12-12
Filing Date
2023-12-11
Publication Date
2026-07-02
Estimated Expiration
2043-12-11

AI Technical Summary

Technical Problem

Existing chain or toothed belt drives experience high pitch frequency noise and increased chain tension due to conventional random sprockets, which exacerbate noise and tension fluctuations, particularly when external vibration excitations are present.

Method used

Implementing non-predominant order (NPO) random sprockets with unique radial variation patterns that avoid sequences predominant in chain tension, using multiple NPO sprockets with different sequences to minimize noise and tension increases.

Benefits of technology

The NPO sprockets effectively reduce pitch frequency noise and maintain maximum chain tension within acceptable levels, even in systems with external vibration excitations, by ensuring no two sprockets excite the same resonance, thus minimizing undesirable tension fluctuations.

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Abstract

A method for reducing the engagement noise in a chain or belt drive for an internal combustion engine with a crankshaft having a drive sprocket (30) and at least one driven shaft with at least one first driven sprocket, comprising the following steps: determining (200) the external excitations in the chain drive to determine the engine cycle sequences in which stresses occur; converting (202) the engine cycle sequences in which stresses predominate into sprocket sequences; determining (204) sprocket sequences that are not predominant; determining (205) a number of sprockets with a non-predominant sequence for the chain or belt drive;Determining (206) a unique set of non-predominant sequences to be integrated into each of the number of non-predominant sequence sprockets intended for the chain or belt drive, such that no non-predominant sequence sprocket has the same engine cycle sequences; Integrating (207) a unique set of at least one non-predominant sequence into a radial variation pattern of a sprocket for each of the non-predominant sequence sprockets; and Installing (208) the non-predominant sequence sprockets into the chain or belt drive of the internal combustion engine.
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Citation Information

Patent Citations

  • Multiple Tension Reducing Sprockets in a Chain and Sprocket System

    US20100292038A1

  • Non-prevalent order random sprocket

    US20180363753A1

  • Roller chain sprockets oriented to minimize strand length variation

    US6213905B1