Bearings – Rotary bearing – Plain bearing
Patent
1993-01-14
1994-01-18
Hannon, Thomas R.
Bearings
Rotary bearing
Plain bearing
384100, 384115, F16C 3310, F16C 3206
Patent
active
052794970
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL AREA
The present invention relates to a radial sliding contact bearing for rotary rolls, with a cylindric fixed inner portion, a sleeve rotatable thereon, and a gap intended for a fluid film arranged between the sleeve and the inner portion, said film in operation forming a rotational bearing for the sleeve, the fluid being delivered to the gap through first and second longitudinal rows of nozzle openings in the peripheral surface of the inner portion, said rows being arranged on each its side of a vertical diametrical plane through the inner portion.
PRIOR ART
A bearing of this kind is known through U.S. Pat. No. 4,558,960. This bearing is practically used in a roll assembly with curved roll intended to be used e.g. as a transport roll or treatment roll within the paper or textile industry. The roll is assembled from sleeve modules connected together end-to-end sealingly and torque transmitting, said modules consisting of rotatable sleeves of the kind defined by way of introduction. This roll rotates about a fixed shaft assembled from cylindric modules arranged end to end and consisting of inner portions of the kind likewise defined by way of introduction, each sleeve then rotating around a corresponding cylindric module. More particularly, the cylindric modules/inner portions have somewhat inclined end surfaces and are arranged end to end with the end surfaces suitably orientated to give the roll the desired curved shape. A steel rod passing through the cylindric modules is tensioned and attached at the ends for obtaining a rigid shaft body.
The said recesses in the peripheral surface of the inner portion include a number of axially extending surface grooves distributed around the periphery of the shaft body, and transverse grooves connecting together said surface grooves, as well as trapezoidally shaped shallow pockets which at their broader base pass over into the longitudinal grooves. Water for the water film appearing during operation is delivered at one end of the longitudinal grooves and is withdrawn at the other one.
Although the introduction of radial bearings and rolls of the described type meant an improvement within the art in a number of respects, some disadvantages have also been noted in practice. Due the absence of a water film between the upper bearing surfaces during standing still of the bearing the roll has thus turned out to be very slow and power demanding at start. Also in operation seemingly unwarranted increases of the power demand and unexplainable wear of portions of the bearing surfaces have appeared.
Through U.S. Pat. No. 3,386,149 a radial bearing for rotating rolls is known, in which two rows of radially directed openings extend through the wall of a tube shaped fixed shaft on equal distances from the vertical central line through the shaft. On this shaft the roll is arranged as a rotatable sleeve. A liquid under pressure is introduced through the tube shaped shaft to the radial openings and out into gap between the shaft and the sleeve. The radial liquid jets flowing out through the openings in the gap are stated to form two lines of support for the sleeve in order to facilitate starting of the sleeve from standing still and as a support against an applied load in the form of a web transported over the sleeve.
THE INVENTION
The object of the present invention is to provide a bearing requiring less power than thus far both at start and during operation.
According to the invention this object is attained in that, at a bearing of the kind defined by a way of introduction,
the two rows of nozzle openings communicate with each other via a common fluid delivery channel in the inner of the inner portion,
the openings of the first row are so located with respect to the vertical diametrical plane that, on the one hand, at start, fluid flowing out through these into the gap lifts the sleeve from the inner portion, and on the other hand, due to tangential forces appearing during start and in operation, said first openings will be choked by the rotatable sleeve resulti
REFERENCES:
patent: 3386149 (1968-06-01), Robertson
patent: 3610146 (1971-10-01), Willmott
patent: 4295690 (1981-10-01), Rutz
patent: 4558960 (1985-12-01), Lehtinen et al.
patent: 4710035 (1987-12-01), Vaughn
patent: 5069558 (1991-12-01), Dinnebier et al.
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