Browse Prior Art Database

Improved Construction of Bender Element Squeeze Bearings

IP.com Disclosure Number: IPCOM000060919D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Scranton, RA: AUTHOR [+2]

Abstract

A disk-shaped pneumatodynamic bearing including at least one layer of piezoelectric material in a sandwich with another layer has electrical and mechanical connections made at the nodal circle of the disk at which no motion occurs during vibration. The disks are made of ceramic material with via connections at the nodal circle to the inner surface of the piezoelectric material. Alternatively, a cylindrical form of pneumatodynamic bearing mounted at nodal points and connected electrically at nodal points also includes via connections through the ceramic material to the inner surfaces of the ceramic material from which the cylinder is constructed. Ceramic transducers are manufactured by using piezoceramic material in the ceramic green sheet (unfired soft form) which is laminated together and then perforated.

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Improved Construction of Bender Element Squeeze Bearings

A disk-shaped pneumatodynamic bearing including at least one layer of piezoelectric material in a sandwich with another layer has electrical and mechanical connections made at the nodal circle of the disk at which no motion occurs during vibration. The disks are made of ceramic material with via connections at the nodal circle to the inner surface of the piezoelectric material. Alternatively, a cylindrical form of pneumatodynamic bearing mounted at nodal points and connected electrically at nodal points also includes via connections through the ceramic material to the inner surfaces of the ceramic material from which the cylinder is constructed. Ceramic transducers are manufactured by using piezoceramic material in the ceramic green sheet (unfired soft form) which is laminated together and then perforated. Metal paste, such as a Mo paste, is deposited into the perforations to fill them with the paste. Then the resulting structure is fired to form a piezoelectric device. In Fig. 1A, a mandrel M (rod) is shown wound with a tape T1 of green sheet material. The tape T1 is long enough to form a multiple layer structure. In Fig. 1B, the entire underlayer is brushed with Mo paste to form a conductive layer L inside the ultimate structure to be formed. In Fig. 1C, the cylinder produced in Fig. 1B is wrapped with a second tape T2 of green sheet material which is then perforated to form via holes
V. In Fig. 1D, metal paste P is inserted into the via holes V so that contact can be made electrically to the layer L through the metal paste. In Fig. 1E, the resulting cylindrical piezoelectric tubular member produced by firing the green sheet material T1 and T2 and the paste L and P is shown with the contacts C1 and C2 formed from the paste P. The cylinder produced can be employed as a cylindrical portion of a squeeze bearing. The bearing is adapted to provide vibratory low friction support for a rod passing through it. Fig. 2A shows a cross section of a green sheet GS with holes H through it, which serve to form vias in Fig. 2B where metal paste P is inserted in holes H. Also a layer of metal paste L3 is placed below the green sheet GS so that the paste P and the paste L3 are connected. In Fig. 2C, the next step is to add metallic paste contacts and conductors C3 and C4 . Next in Fig. 2D, a second green sheet GS2 with similar configuration is stacked upon the first green sheet with paste P2 in holes in contact with the paste C3 and C4 . On top of the top paste-filled vias P2 are deposited paste pads C5 and C6 which are adapted for connection to external wiring for actuation of the resulting squeeze bearing when the product of Fig. 2E is fired to produce a unitary piezoceramic device. Prior to firing, a disk is punched out of the structure in Fig. 2E to produce the result in Fig. 2F, which is a plan view of the structure. Fig. 3 shows a cross-sectional view of a squee...