Structure of ring gear unit
By designing a spherical recess and a gradually widening support structure at the foot of the ring gear, the stress concentration problem at the boss part is solved, the strength and durability of the ring gear are improved, and its large size is avoided.
CN122407759APending Publication Date: 2026-07-17TOYOTA JIDOSHA KK
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2025-12-13
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing ring gears tend to concentrate bending or shear stress at the root of the boss, leading to a decrease in strength and durability. Larger size may be needed to solve this problem.
Method used
A spherical recess is formed at the support foot of the ring gear, and the width of the support foot gradually increases at the root. The radius of curvature of the connecting R part gradually decreases on the disk side, forming a smooth shape change to avoid stress concentration.
Benefits of technology
By improving the structure of the support legs, stress concentration was reduced, the strength and durability of the ring gear were improved, and the need for larger size was avoided.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN122407759A_ABST
Abstract
本发明提供一种环形齿轮单元，其用于在受限尺寸范围内能够提高强度或耐久性的差速齿轮。一种环形齿轮单元的结构，其在形成有外齿的环状部的内侧具有盘部，在盘部的外周部中相对于环状部的中心对称的两个部位形成有沿环状部的轴线方向突出的支脚部，在支脚部形成有嵌合小齿轮轴的安装孔，其中，在支脚部的彼此对置的对置面上形成有球面状的凹部，支脚部的夹着凹部的两侧部成为截面形状呈凸圆弧状的R部，R部的对置面上的边界线彼此的间隔即支脚部的宽度比凹部的宽度宽。
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Citation Information
Patent Citations
Differential ring gear
JP2017219141A