Structure of a radiating fan

• US 6,254,348 B1
• Filed: 04/19/1999
• Issued: 07/03/2001
• Est. Priority Date: 04/19/1999
• Status: Expired due to Fees

• Current Assignee: Richard Lee
• Original Assignee: Richard Lee
• Inventors: Lee, Richard
• Primary Examiner(s): Ryznic, John E.
• Application Number:
  US09/296,429
• Time in Patent Office: 806 Days
• Field of Search: 416/174, 416/244.R, 416/204.R, 415/216.1, 415/229, 415/220, 415/223, 384/913, 384/907.1, 384/291, 384/297
• US Class Current: 416/174
• CPC Class Codes: F04D 29/023 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/0566 Ceramic bearing designs
• CPC Class Codes: F04D 29/057 hydrostatic; hydrodynamic
• CPC Class Codes: F05D 2300/20 Oxide or non-oxide ceramics
• CPC Class Codes: F05D 2300/506 Hardness
• CPC Class Codes: F16C 33/043 Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]

Abstract

An improved structure of a radiating fan comprises a blade seat, an axle center and a bearing. The central portion of the blade seat is installed with the axle center made of precision ceramic material, the outer peripheral surface of the axle center is covered by a hollow bearing made of precision ceramic material. Since the axle center and the bearing made of precision ceramic material have the advantages of long lifetime, low noise, and without using lubricating oil. Thus it is better than the axle center made of stainless steel and the oil bearing made of copper.

Claims

1. A structure of a radiating fan comprising a blade seat, an axle and a hollow bearing, wherein the axle is made of precision ceramic material and installed in a center portion of the blade seat, the hollow bearing being self lubricating and made of precision ceramic material, the hollow bearing being located to enclose an outer peripheral surface of the axle, the hollow bearing having at least one annular groove formed in an inner peripheral surface of the bearing for reducing frictional contact area between the axle and the bearing.

2. The structure of a radiating fan as claimed in claim 1, wherein an outer peripheral surface of the axle has at least one annular groove formed therein.

3. The structure of a radiating fan as claimed in claim 1, wherein the precision ceramic material has a hardness greater than HK1200.

4. A structure of a radiating fan comprising a blade seat, an axle and a hollow bearing, wherein the axle is made of precision ceramic material and installed in a center portion of the blade seat, the hollow bearing being self lubricating and made of precision ceramic material, the hollow bearing being located to enclose a longitudinally extended portion of an outer peripheral surface of the axle, the hollow bearing having a plurality of longitudinally extended and angularly spaced trenches formed in an inner peripheral surface of the bearing for reducing frictional contact area between the axle and the bearing.

5. The structure of a radiating fan as claimed in claim 4, wherein the precision ceramic material has a hardness greater than HK1200.