Outer rotor type motor
JP2026096315APending Publication Date: 2026-06-15SHINANO KENSHI CO LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SHINANO KENSHI CO LTD
- Filing Date
- 2024-12-03
- Publication Date
- 2026-06-15
AI Technical Summary
⚠Technical Problem
Existing outer rotor type motors experience abnormal noise and reduced lifespan due to the preload spring rotating synchronously with the rotor, leading to increased friction and scratches when the rotational load on the rolling bearings increases, especially in low-temperature environments.
⚗Method used
The preload spring is wound in a direction that does not hinder the driven rotation of the rotor yoke, minimizing friction and interference, thereby suppressing abnormal noise and reducing scratches.
🎯Benefits of technology
The solution reduces noise generation and extends the lifespan of components by preventing the preload spring's winding end from catching on the sliding surfaces, even under increased rotational loads.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026096315000001_ABST
Abstract
This invention provides an outer rotor type motor that, even when the rotational load on the rolling bearing supporting the rotor shaft increases, suppresses the occurrence of abnormal noise by reducing the snagging of the winding end of the preload spring against the sliding surface, thereby reducing noise and preventing scratches, thus extending the lifespan of the components. [Solution] The rotor shaft 3b is fitted between the hub 3a1 of the rotor yoke 3a and the bearing 8b which is positioned axially opposite to it, and a preload spring 8d is fitted and installed compressed from its natural length. The preload spring 8d is a compression coil spring and is wound in a direction such that the wound end 8d1 does not interfere with the driven rotation with respect to the rotational direction of the rotor yoke 3a.
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