GB382843A - Improvements in or relating to bearings - Google Patents

Abstract

382,843. Tilting pad bearings. AKTIEBOLAGET NOMY, 2, Norrmalmstorg, Stockholm. Feb. 29, 1932, No. 6065. Convention date, March 6, 1931. [Class 12 (i).] In an axial thrust bearing having tiltably supported bearing-blocks which co-operate with a bearing-surface, the latter, at one or more places, is formed so that the blocks when moving past such places become unloaded. Each block 2, Figs. 1 to 3, has a radially extending rib which engages one or other edge a, b of a groove 8 formed in a carrier ring 3 fixed to the shaft (not shown). The blocks 2 are rotated by the engagement of abutment faces 6 or 6<1> on the ring 3 with projections 7 on the blocks 2. The distance between the faces 6, 6<1> is greater than the circumferential length of the blocks 2 so that the blocks can move slightly relatively to the ring 3 to permit them to tilt either on the edge a or edge b, according to the direction. of rotation, to form wedge-shaped lubricant films between the blocks and a bearing face 12 on a ring 11 seated spherically on a support 14. The ring 11 has one or more recesses 13, preferably two diametrically disposed, circumferentially longer than the blocks 2 so that as the latter move across such recesses they are relieved from load. The blocks are interconnected in pairs by projections 19 on rings 18 which are accommodated in dovetailed grooves 16, 17, in the blocks 2 and carrier 3 respectively. These rings 18 prevent the blocks from falling out during assembly and prevent the blocks from moving on to a wrong supporting surface a, b during operation. In a modification, the bearing face 12 of the ring 11 and the cooperating faces of the blocks. are spherical. As shown in Fig. 13, the blocks 2, as they pass across the unloaded zones 13, are engaged frictionally by spring-urged members 23 carried by the ring 11, to ensure movement of the blocks to the position of correct working upon reversal of rotation of the shaft. In this construction, the projections 19 on the rings 18 may be omitted. In another modification, the blocks 2, Figs. 14 and 15, have parallel ribs 28, 28<1> and are pivoted on pins 27 on the carrier ring 3, the extent of pivoting being limited by a rib 31 on the ring 3. The ring 3 has grooves 30, 30<1>, angularly arranged. When the shaft rotates in one direction, the rib 28 lies across the groove 30 and the block tilts thereabout so that the rib 28<1> enters the groove 30<1>, and upon rotation in the reverse direction the block turns about the pin 27 and tilts about the rib 28<1> and the rib 28 enters the groove 30. The ribs 28, 28<1> may be mutually inclined. The invention may be applied to bearings having stationary blocks 2.