Journal bearing assembly with dual oil cavities
A gas turbine engine comprising a gearbox, the gearbox having gear(s). A journal bearing assembly rotatably supports the gear, the journal bearing assembly having at least a pin, and a journal having a tubular body defining a pin-receiving inner cavity having an inner surface, a first cavity and a second cavity defined in the inner surface of the pin-receiving inner cavity, a rib support located between the first cavity and the second cavity, the rib support being aligned with a longitudinal center of the tubular body, with the first cavity and the second cavity on opposed axial sides of the rib support.
1. A gas turbine engine comprising a gearbox, the gearbox having at least one gear, a journal bearing assembly rotatably supporting said gear, the journal bearing assembly having at least a pin, and a journal having a tubular body defining a pin-receiving inner cavity having an inner surface and receiving the pin therein, a first cavity and a second cavity defined in the inner surface of the pin-receiving inner cavity, a rib support located between the first cavity and the second cavity, the rib support being aligned with a longitudinal center of the tubular body, with the first cavity and the second cavity on opposed axial sides of the rib support, the pin-receiving inner cavity defining a pin-engaging surface contacting the pin at the rib support and between axial end faces and the first cavity and the second cavity.
2. The gas turbine engine according to claim 1 , wherein a recess is defined in an outer annular surface of the tubular body, a first oil passage extending from the first cavity to the recess.
3. The gas turbine engine according to claim 2 , wherein a second oil passage extends from the second cavity to the recess.
4. The gas turbine engine according to claim 2 , wherein the recess has a plane on the outer annular surface.
5. The gas turbine engine according to claim 1 , wherein an undercut is defined circumferentially in a first and/or a second one of the axial end faces of the tubular body.
6. The gas turbine engine according to claim 1 , wherein the first cavity and the second cavity are annular.
7. The gas turbine engine according to claim 1 , wherein a length to diameter ratio of the tubular body is from between 1.50 and 3.00 inclusively.
8. The journal according to claim 1 , wherein the journal has a plane of symmetry passing through the longitudinal center and transverse to a longitudinal axis of the tubular body.
9. A journal bearing assembly comprising
a pin, and
a journal defining an inner cavity receiving the pin, a first cavity and a second cavity defined in an inner surface of the pin-receiving cavity, a central support located between the first cavity and the second cavity and contacting said pin, the central support being aligned with a longitudinal center of the journal, the pin-receiving inner cavity defining a pin-engaging surface contacting the pin at the central support and between axial end faces and the first cavity and the second cavity;
wherein the pin defines an inner oil reservoir, a first outlet oil passage extending from the oil reservoir to the first cavity.
10. The journal bearing assembly according to claim 9 , wherein a second outlet oil passage extends from the oil reservoir to the second cavity.
11. The journal bearing assembly according to claim 10 , further comprising a sleeve rotatably mounted onto the journal, and a recess is defined between an outer annular surface of the journal and an inner surface of the sleeve, a first oil passage extending from the first cavity to the recess and a second oil passage extending from the second cavity to the recess.
12. The journal bearing assembly according to claim 11 , wherein the recess is defined in the outer annular surface of the journal.
13. The journal bearing assembly according to claim 9 , wherein the first cavity and the second cavity are annular.
14. The journal bearing assembly according to claim 9 , wherein a length to diameter ratio of the tubular body is from between 1.50 and 3.00 inclusively.
15. The journal bearing assembly according to claim 9 , wherein the journal has a plane of symmetry passing through the longitudinal center and transverse to a longitudinal axis of the tubular body.
16. A journal bearing assembly comprising
a pin, and
a journal defining an inner cavity receiving the pin, a first cavity and a second cavity defined in an inner surface of the pin-receiving cavity, a central support located between the first cavity and the second cavity and contacting said pin, the central support being aligned with a longitudinal center of the journal, the pin-receiving inner cavity defining a pin-engaging surface contacting the pin at the central support and between axial end faces and the first cavity and the second cavity;
wherein the first cavity and the second cavity are annular.
17. The journal bearing assembly according to claim 16 , wherein a length to diameter ratio of the tubular body is from between 1.50 and 3.00 inclusively.
18. The journal bearing assembly according to claim 16 , wherein the journal has a plane of symmetry passing through the longitudinal center and transverse to a longitudinal axis of the tubular body.