Tilting pad type journal bearing

Patent metadata

Field	Value
Publication number	US-2016169274-A1
Application number	US-201514961981-A
Country	US
Kind code	A1
Filing date	Dec 8, 2015
Priority date	Dec 10, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

Provided is a tilting pad type journal bearing capable of reducing the amount of oil that has to be supplied to the bearing. A bearing comprises nozzles 5 which are each arranged between pads 2 to supply lubricating oil to sliding surfaces 14 of the pads 2 . The sliding surface 14 of each of the pad 2 is formed so that the width of the sliding surface 14 increases as it goes from a front edge part towards a rear edge part thereof. A tip end part of each of the nozzles 5 has a groove part 18 which induces a flow heading from lateral parts towards the center in the width direction, in an oil flow from the rear edge part of the sliding surface 14 of an upstream pad 2 to the front edge part of the sliding surface 14 of a downstream pad 2.

First claim

What is claimed is:

1 . A tilting pad type journal bearing comprising:
a plurality of pads which are arranged along the periphery of a rotary shaft; a bearing housing which supports the pads in a tiltable manner via a plurality of pivots; and a plurality of nozzles which are each arranged between the pads to supply lubricating oil to sliding surfaces of the pads, wherein the sliding surface of each of the pads is formed so that the width of the sliding surface increases as it goes from a front edge part towards a rear edge part of the sliding surface, and a tip end part of at least one of the nozzles has a groove, part which induces a flow heading from lateral parts towards the center in the width direction, in an oil flow from the rear edge part of the sliding surface of an upstream pad to the front edge part of the sliding surface of a downstream pad.

2 . The tilting pad type journal bearing according to claim 1 , wherein:
the tip end part of each of the nozzles has a top surface whose outline width dimension is greater than or equal to the width dimension of the rear edge part of the sliding surface of the pad, and the groove part is formed on the top surface of the at least one of the nozzles.

3 . The tilting pad type journal bearing according to claim 2 , wherein:
each nozzle not having the groove part includes at least one oil discharge port formed on the top surface, and each nozzle having the groove part includes at least one oil discharge port formed at the bottom of the groove part.

4 . The tilting pad type journal bearing according to claim 2 , wherein:
the rotary shaft extends in a horizontal direction, and the groove part is formed on at least one of the nozzles excluding a nozzle on the upstream side of a pad situated under the rotary shaft.

5 . The tilting pad type journal bearing according to claim 2 , wherein:
the rotary shaft extends in a horizontal direction, and the groove part is formed on at least one of the nozzles excluding a nozzle situated under the rotary shaft and a nozzle situated upstream of the former nozzle across a pad.

6 . The tilting pad type journal bearing according to claim 1 , wherein the pad is configured so that the total width of the entire pad including the sliding surface and step surfaces is constant from its front edge to its rear edge.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Sato Motoki
• Suzuki Kenta
• Hemmi Makoto

Classifications

• F16C33/1045

  Details of supply of the liquid to the bearing · CPC title

• F16C17/03 Primary

  with tiltably-supported segments, e.g. Michell bearings {(hydrostatic bearings with tiltably supported bearing pads F16C32/0666; made from a plurality of rods F16C33/26; with flexible leaves F16C17/024; hydrodynamic bearings with chambers F16C33/1075)} · CPC title

• F16C33/1085

  Channels or passages to recirculate the liquid in the bearing · CPC title

• F16C33/106

  Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid · CPC title

• F16C33/108

  with a plurality of elements forming the bearing surfaces, e.g. bearing pads · CPC title