SUPPORTING DEVICE

The reduction device addresses the challenge of maintaining moment stiffness and preventing bearing wear by using flanges with lower hardness than the power transmission journal to adjust preload based on load conditions, ensuring efficient operation and extended bearing life.

DE102025154075A1Undetermined Publication Date: 2026-07-09NABTESCO CORP
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Patent Information

Application Number
DE102025154075
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-12-18
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing reduction devices with eccentrically pivoting mechanisms face challenges in maintaining moment stiffness of rolling bearings while preventing a reduction in service life and drive efficiency due to preload application, which increases bearing load and shortens service life.

Method used

A reduction device design featuring flanges with lower hardness than the power transmission journal, allowing adjustable preload based on load conditions, ensuring minimal preload under light loads and increased preload under heavy loads, thus maintaining moment stiffness without reducing bearing life or efficiency.

Benefits of technology

The design effectively suppresses a reduction in the service life of rolling bearings and maintains drive efficiency by dynamically adjusting preload to match load conditions, achieving desired moment stiffness while preventing bearing wear.

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Abstract

A reduction device comprises: a cylindrical housing 2; a first flange 13 rotatably mounted on an inner circumferential surface 2b of the housing 2 via a first bearing 15; a second flange 14 rotatably mounted on the inner circumferential surface 2b of the housing 2 via a second bearing 16; a power transmission pin 9 inserted into the first bolt insertion bore 51 and the second bolt insertion bore 52; a reduction mechanism 30 provided between the first flange 13 and the second flange 14; a first bearing holder 81 provided on the first flange 13, wherein the first bearing holder 81 holds the first bearing 15 from a side opposite the second flange 14; and a second bearing holder 82 provided on the second flange 14, wherein the second bearing holder 82 holds the second bearing 16 from a side opposite the first flange 13.The hardness of the power transmission pin 9 is greater than the hardness of the first flange 13 and the second flange 14.
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Citation Information

Patent Citations

  • Gear transmission

    JP2017082993A