Belt-type gear transmission in which gear of planetary gear moves for engagement with gear of belt

The belt-type gear transmission addresses gear positioning and meshing challenges by using a two-way buffer and elastic force to ensure precise meshing and reduce eccentricity, enabling efficient transmission of large driving forces with continuous variable gear ratios.

WO2025193040A1 Publication Date: 2025-09-18CHO SUNG BONG +1
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Patent Information

Application Number
PCT/KR2025/099650
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-18
Filing Date
2025-03-11
Publication Date
2025-09-18

AI Technical Summary

Technical Problem

Conventional belt-type gear transmissions face challenges in controlling the position of planetary gears during gear shifting, precise meshing of gears, changes in belt length due to varying planetary gear radii, and eccentricity issues due to differing rotational radii on the drive and driven shafts.

Method used

The belt-type gear transmission incorporates planetary gears with a two-way buffer and elastic force to allow micro-rotation and meshing, using a bidirectional shock absorber, spring pressure regulator, and rotation inducer to manage gear positioning and movement, ensuring precise meshing and reducing eccentricity.

Benefits of technology

This design enables efficient transmission of large driving forces with continuous variable gear ratios by maintaining precise gear meshing and minimizing eccentricity, enhancing the performance and reliability of belt-type gear transmissions.

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Abstract

Disclosed is a belt-type gear transmission configured such that, when a gear of a planetary gear and a gear of a belt are not accurately engaged and meshed with each other as a result of the radius of rotation of the planetary gear continuously changing, the gear of the planetary gear restrained by the elastic force of a two-way buffer provided on the inside can move in the axial direction and rotate slightly so as to be increased or decreased by one by an incline and meshed with the gear of the belt. The belt-type gear transmission comprises: a driving gear assembly installed on a driving shaft; a driven gear assembly installed on a driven shaft; a belt having a gear formed on the inner surface thereof and connecting the driving gear assembly and the driven gear assembly so as to transmit the rotational force of the driving shaft to the driven shaft; and a transmission control unit for controlling gear shifting by continuously adjusting the radius of rotation of at least one of the driving gear assembly or the driven gear assembly. At least one of the driving gear assembly or the driven gear assembly includes a plurality of planetary gears arranged at equal intervals and spaced the same distance from the center of a corresponding shaft. The planetary gear comprises: a main body having a left pin and a right pin; and a gear sleeve which has a cylindrical shape surrounding a portion of the left pin, can move to the left and right around the main body, is coupled so as to be rotatable within a minute range, and has a gear that is formed on at least a portion of the outer circumference and maintains a constant inclination with respect to the axial direction parallel to the driving shaft while engaged with the gear of the belt.
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