Motor main shaft provided with fast cooling means

• US 6,373,158 B1
• Filed: 11/22/2000
• Issued: 04/16/2002
• Est. Priority Date: 10/05/2000
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chang, Tsann-Huei, Hsu, Jih-Jong
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Lam, Thanh
• Application Number:
  US09/717,087
• Time in Patent Office: 510 Days
• Field of Search: 310/90, 310/52, 310/59, 310/64, 384/476, 384/494
• US Class Current: 310/90
• CPC Class Codes: F16C 37/007 of rolling bearings
• CPC Class Codes: H02K 1/32 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 5/18 with ribs or fins for improving heat transfer
• CPC Class Codes: H02K 7/085 radially supporting the rotary shaft at only one end of the rotor H02K7/086, H02K7/09 take precedence

Abstract

A motor main shaft has a plurality of rolling bearings, a plurality of spacing rings, and a sleeve, which are all provided with a plurality of microfins to prevent the overheating of the main shaft in motion. The microfins serve to promote the heat convection.

Claims

1. A motor main shaft comprising:

a main shaft driven by a motor;

a plurality of rolling bearings fitted over said main shaft at an interval;

a plurality of spacing rings, with each being fitted over said main shaft such that said each spacing ring is located between two of said rolling bearings; and

a sleeve fitted over said main shaft, said rolling bearings and said spacing rings;

wherein said rolling bearings, said spacing rings and said sleeve are provided with a plurality of cooling microfins which are arranged at an interval.

2. The main shaft as defined in claim 1, wherein said microfins are made by LIGA.

3. The main shaft as defined in claim 1, wherein said rolling bearings and said spacing rings are coated with a high heat transfer layer by ionic implantation or sputtering.

4. The main shaft as defined in claim 3, wherein said high heat transfer layer is formed of silver.

5. The main shaft as defined in claim 3, wherein said high heat transfer layer is formed of copper.

6. The main shaft as defined in claim 3, wherein said high heat transfer layer is formed of copper-beryllium alloy.