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Air Bearing Using Bernoulli Effect to Obtain Pressure Differential

IP.com Disclosure Number: IPCOM000047295D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 72K

Publishing Venue

IBM

Related People

McLachlan, DS: AUTHOR

Abstract

This article describes an arrangement for suspending magnetic recording heads between a pair of discs in a recording head disk drive. Air flow is supplied by the Bernoulli effect to provide low friction support by separating the bearing surfaces with air drawn through the arrangement. The low pressure regions around an aerodynamically designed head are used to suck the air in through the bearing. The concept is illustrated below for a head moving symmetrically between two disc surfaces. This symmetric structure is not necessary for the above principle to work. Fig. 1 is a vertical elevation of a magnetic recording head drive for a stack of magnetic recording disks a. Fig. 2 is a section taken along line 2-2 in Fig. 1. Fig. 3 is a perspective view of several elements including the air bearing member c (of Figs.

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Air Bearing Using Bernoulli Effect to Obtain Pressure Differential

This article describes an arrangement for suspending magnetic recording heads between a pair of discs in a recording head disk drive. Air flow is supplied by the Bernoulli effect to provide low friction support by separating the bearing surfaces with air drawn through the arrangement. The low pressure regions around an aerodynamically designed head are used to suck the air in through the bearing. The concept is illustrated below for a head moving symmetrically between two disc surfaces. This symmetric structure is not necessary for the above principle to work. Fig. 1 is a vertical elevation of a magnetic recording head drive for a stack of magnetic recording disks a. Fig. 2 is a section taken along line 2-2 in Fig. 1. Fig. 3 is a perspective view of several elements including the air bearing member c (of Figs. 1 and 2) riding on tube b. Member c is adapted for supporting magnetic recording heads g. Member c slides along the length of tube b, in the directions shown by the arrow in Fig. 3. In other words, the member c slides reciprocally, moving the heads back and forth. The independently suspended recorder heads g float above the disc surface. The rapidly spinning magnetic disks a are shown in edge views in Figs. 1 and 2. In Fig. 3, the disks a and heads g have been removed for convenience of illustration. Hollow tube b provides an axle or rod upon which a member c can ride back and forth. Member c and tube b form a sleeve bearing. Because disks a are rotating rapidly, a Bernoulli effect is created on the surfaces of member c which are juxtaposed with the flat surfaces of the disks a. Member c has slots s, seen in Figs. 1 and 3, which connect to passageways w and duct d to the interior of member c which includes a cylindrical hole k though which the tube b is inserted. Use of the Bernoulli effect to produce air flow through the bearing eliminates the need for an air compressor booster pump to generate sufficient positive air pressure to operate or assist the frictionless air-bearing in such a head. Low pressure is created between the surfaces of a rapidly rotating magnetic recording disk and a member for supporting a magnetic recording head. The support has surfaces which are very close to the disk. The low pressure draws air from slots s in the support member c which are connected by means explained below to draw air through the perforations p in the tubular bearing member b. Inside bearing member c the air is drawn out through perforations p, creating a flow of air which provides an air-bearing from the air rushing between the exterior surface of tube b and the hole k upon which the tube b is supported. The mechanism for generating the air pressure diffe...