US 11,795,995 B2
Journal bearing and rotating machine
Naokatsu Takara, Tokyo (JP); Yosuke Uchida, Tokyo (JP); and Saya Okano, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/628,565
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 5, 2019, PCT No. PCT/JP2019/043253
§ 371(c)(1), (2) Date Jan. 20, 2022,
PCT Pub. No. WO2021/090360, PCT Pub. Date May 14, 2021.
Prior Publication US 2022/0260113 A1, Aug. 18, 2022
Int. Cl. F16C 17/03 (2006.01); F16C 33/10 (2006.01)
CPC F16C 17/03 (2013.01) [F16C 33/108 (2013.01); F16C 33/1045 (2013.01); F16C 33/1065 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A journal bearing, comprising:
a carrier ring to be arranged on an outer peripheral side of a rotation shaft;
a pad to be swingably arranged on the outer peripheral side of the rotation shaft and an inner peripheral side of the carrier ring; and
an oil supply nozzle configured to supply oil to a portion between the rotation shaft and the pad,
wherein the pad includes:
an inner peripheral surface opposed to the rotation shaft;
an outer peripheral surface opposed to the carrier ring via a gap; and
an upstream end surface which is formed on an upstream side of the inner peripheral surface in a rotating direction of the rotation shaft, and connects the inner peripheral surface and the outer peripheral surface to each other,
wherein the inner peripheral surface includes:
a partially cylindrical surface; and
a recessed portion which is arranged on an upstream side of the partially cylindrical surface, and forms an opening space for storing the oil,
wherein the opening space includes:
an oil inlet port which is opened at the upstream end surface, and is configured to introduce the oil to the opening space; and
an oil outlet port opened so as to be opposed to the rotation shaft,
wherein the pad includes a backflow prevention portion configured to prevent the oil in the opening space from flowing back to the oil inlet port,
wherein the oil supply nozzle is arranged to be adjacent to the pad in a circumferential direction,
wherein the backflow preventing portion includes a bottom surface that defines an outer peripheral side of the opening space, and
wherein a radial distance between the bottom surface and the rotation shaft decreases toward the upstream side.
 
11. A journal bearing, comprising:
a carrier ring to be arranged on an outer peripheral side of a rotation shaft;
a pad to be swingably arranged on the outer peripheral side of the rotation shaft and an inner peripheral side of the carrier ring; and
an oil supply nozzle configured to supply oil to a portion between the rotation shaft and the pad,
wherein the pad includes:
an inner peripheral surface opposed to the rotation shaft,
an outer peripheral surface opposed to the carrier ring via a gap; and
an upstream end surface which is formed on an upstream side of the inner peripheral surface in a rotating direction of the rotation shaft, and connects the inner peripheral surface and the outer peripheral surface to each other,
wherein the inner peripheral surface includes:
a partially cylindrical surface; and
a recessed portion which is arranged on an upstream side of the partially cylindrical surface, and forms an opening space for storing the oil,
wherein the opening space includes:
an oil inlet port which is opened at the upstream end surface, and is configured to introduce the oil to the opening space; and
an oil outlet port opened so as to be opposed to the rotation shaft,
wherein the pad includes a backflow prevention portion configured to prevent the oil in the opening space from flowing back to the oil inlet port,
wherein the opening space includes two axial end sides, and the backflow preventing portion includes:
a first side surface that defines a first one of the two axial end sides of the opening space; and
a second side surface that defines a second one of the two axial end sides of the opening space, and
wherein an axial distance between the first side surface and the second side surface decreases toward the upstream side.
 
15. A journal bearing, comprising:
a carrier ring to be arranged on an outer peripheral side of a rotation shaft;
a pad to be swingably arranged on the outer peripheral side of the rotation shaft and an inner peripheral side of the carrier ring; and
an oil supply nozzle configured to supply oil to a portion between the rotation shaft and the pad,
wherein the pad includes:
an inner peripheral surface opposed to the rotation shaft;
an outer peripheral surface opposed to the carrier ring via a gap; and
an upstream end surface which is formed on an upstream side of the inner peripheral surface in a rotating direction of the rotation shaft, and connects the inner peripheral surface and the outer peripheral surface to each other,
wherein the inner peripheral surface includes:
a partially cylindrical surface; and
a recessed portion which is arranged on an upstream side of the partially cylindrical surface, and forms an opening space for storing the oil,
wherein the opening space includes:
an oil inlet port which is opened at the upstream end surface, and is configured to introduce the oil to the opening space; and
an oil outlet port opened so as to be opposed to the rotation shaft,
wherein the pad includes a backflow prevention portion configured to prevent the oil in the opening space from flowing back to the oil inlet port,
wherein the backflow preventing portion includes a backflow preventing member separate from the pad, and
wherein the backflow preventing member is mounted to the pad so as to cover a part of the oil inlet port.