Motor Cover Nut Fixation via Segmented Pockets and Grooves
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Solution Overview
Problem
Motors with a housing and cover structure experience low loosening torque during caulking, leading to potential nut loosening due to the caulked portion only contacting the upper surface of the bearing, resulting in reduced foreign material generation and increased risk of nut detachment.
Innovation Solution
A motor design featuring a cover with a first pocket for the bearing and a second pocket for the nut, where the nut includes a body with screw threads and an extension portion above the cover surface, and grooves on both the nut and cover to enhance coupling force, ensuring the nut is securely fastened and reducing foreign material generation during caulking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover is caulked to fix the nut, then the nut is secured to the cover, but foreign material is generated during the caulking process
Solution Approach 1:
The cover is divided into two separate pockets: a first pocket for accommodating the bearing and a second pocket for accommodating the nut. This segmentation isolates the caulking operation to only the second pocket area, preventing foreign material from being generated in the bearing accommodation region while still achieving reliable nut fixation through selective caulking of the extension portion.
2Reliability
If the cover is caulked, then the nut is fixed to the cover, but the loosening torque is low because the caulked portion contacts only the upper surface of the bearing
Solution Approach 1:
The nut is designed with an extension portion that extends upward from the body, and the second pocket includes grooves that engage with protrusions on the nut. The caulking process deforms the extension portion to engage with these grooves, creating a multi-dimensional engagement structure that significantly increases loosening torque compared to conventional single-surface contact fixation.
3Device complexity
If a conventional single-pocket structure is used, then the structure is simple, but the nut is easily loosened due to low loosening torque
Solution Approach 1:
The cover is segmented into a first pocket for the bearing and a second pocket for the nut, with the second pocket specifically designed to receive and secure the extension portion of the nut through grooves. This segmentation enables enhanced loosening torque through multi-point engagement while maintaining overall structural simplicity and avoiding the need for complex additional fastening mechanisms.
Data Source
AI summary
The present invention may provide a motor including a housing, a cover which covers the housing, a stator disposed inside the housing, a rotor disposed inside the stator, a rotary shaft coupled to the rotor, a bearing disposed on the cover, and a nut which is coupled to the cover and which is in contact with an outer ring of the bearing, wherein the cover incudes a first pocket accommodating the bearing and a second pocket which is disposed above the first pocket and to which the nut is rotation-coupled, the nut includes a body disposed to be lower than an upper surface of the cover and including a screw thread and an extension portion disposed to be higher than the upper surface of the cover, the body incudes a protrusion protruding outward from the screw thread, and the second pocket includes a first groove in which the protrusion is positioned.