Oil-drain device for thrust bearing device and turbocharger provided with the same
First Claim
1. An oil-drain device for a thrust bearing, comprising:
- a rotor shaft;
a collar member to be mounted to an outer periphery of the rotor shaft so as to be rotatable with the rotor shaft, the collar member having a collar body portion having a cylindrical shape and a flange portion formed to have a larger diameter than the collar body portion;
a thrust bearing having an insertion hole into which the rotor shaft is inserted, the thrust bearing being configured to make slide contact with a first end surface of the flange portion of the collar member to support the rotor shaft which rotates in a state of being inserted into the insertion hole in an axial direction;
an oil-supply channel for supplying lubricant oil to a sliding portion of the thrust bearing which makes slide contact with the first end surface of the flange portion; and
an oil-drain space forming member disposed on a side of a first end surface of the thrust bearing, the oil-drain space forming member defining an oil-drain space through which the lubricant oil leaking from the sliding portion of the thrust bearing flows, between the thrust bearing and the oil-drain space forming member,wherein the oil-drain space includes;
an oil-drain channel defined between the first end surface of the thrust bearing and a first end surface of the oil-drain space forming member, the oil-drain channel surrounding the flange portion of the collar member; and
an oil-drain port formed below the oil-drain channel, for discharging the lubricant oil flowing through the oil-drain channel outside the oil-drain space,wherein the oil-drain space forming member at least comprises a body portion including;
a center hole into which the collar body portion of the collar member mounted to the rotor shaft is inserted;
an inner peripheral edge portion which makes slide contact with a second end surface of the flange portion of the collar member at a radially outer side of the center hole;
an intermediate portion formed on a radially outer side of the inner peripheral edge portion, with a gap from the first end surface of the thrust bearing; and
an outer peripheral edge portion configured to make contact with the first end surface of the thrust bearing at a radially outer side of the intermediate portion,wherein the oil-dram port is formed by a portion at a lower end body portion, the portion not having the outer peripheral edge portion formed thereon, andwherein the outer peripheral edge portion includes;
an arc shaped portion extending in an arc shape from an upstream edge of the outer peripheral edge portion toward a predetermined position upstream of the oil drain-port in the rotational direction, anda linear portion extending from the predetermined position in the arc-shaped portion to the oil-drain port along a tangent direction at the predetermined position.
2 Assignments
0 Petitions
Accused Products
Abstract
An oil-drain device for a thrust bearing includes: a rotor shaft; a collar member mounted to an outer periphery of the rotor shaft; a thrust bearing supporting the rotor shaft in an axial direction; and an oil-drain space forming member defining an oil-drain space through which lubricant oil leaking from a sliding portion of the thrust bearing flows, between the thrust bearing and the oil-drain space forming member. The oil-drain space includes: an oil-drain channel defined between a first end surface of the thrust bearing and a first end surface of the oil-drain space forming member, surrounding the flange portion of the collar member; and an oil-drain port formed below the oil-drain channel, for discharging the lubricant oil flowing through the oil-drain channel outside the oil-drain space. The oil-drain space is configured to guide the lubricant oil flowing through the oil-drain channel to outside the oil-drain space via the oil-drain port, along a flow direction of the lubricant oil flowing through the oil-drain channel from an upstream side toward a downstream side in a rotational direction of the rotor shaft.
15 Citations
15 Claims
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1. An oil-drain device for a thrust bearing, comprising:
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a rotor shaft; a collar member to be mounted to an outer periphery of the rotor shaft so as to be rotatable with the rotor shaft, the collar member having a collar body portion having a cylindrical shape and a flange portion formed to have a larger diameter than the collar body portion; a thrust bearing having an insertion hole into which the rotor shaft is inserted, the thrust bearing being configured to make slide contact with a first end surface of the flange portion of the collar member to support the rotor shaft which rotates in a state of being inserted into the insertion hole in an axial direction; an oil-supply channel for supplying lubricant oil to a sliding portion of the thrust bearing which makes slide contact with the first end surface of the flange portion; and an oil-drain space forming member disposed on a side of a first end surface of the thrust bearing, the oil-drain space forming member defining an oil-drain space through which the lubricant oil leaking from the sliding portion of the thrust bearing flows, between the thrust bearing and the oil-drain space forming member, wherein the oil-drain space includes; an oil-drain channel defined between the first end surface of the thrust bearing and a first end surface of the oil-drain space forming member, the oil-drain channel surrounding the flange portion of the collar member; and an oil-drain port formed below the oil-drain channel, for discharging the lubricant oil flowing through the oil-drain channel outside the oil-drain space, wherein the oil-drain space forming member at least comprises a body portion including; a center hole into which the collar body portion of the collar member mounted to the rotor shaft is inserted; an inner peripheral edge portion which makes slide contact with a second end surface of the flange portion of the collar member at a radially outer side of the center hole; an intermediate portion formed on a radially outer side of the inner peripheral edge portion, with a gap from the first end surface of the thrust bearing; and an outer peripheral edge portion configured to make contact with the first end surface of the thrust bearing at a radially outer side of the intermediate portion, wherein the oil-dram port is formed by a portion at a lower end body portion, the portion not having the outer peripheral edge portion formed thereon, and wherein the outer peripheral edge portion includes; an arc shaped portion extending in an arc shape from an upstream edge of the outer peripheral edge portion toward a predetermined position upstream of the oil drain-port in the rotational direction, and a linear portion extending from the predetermined position in the arc-shaped portion to the oil-drain port along a tangent direction at the predetermined position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An oil-drain device for a thrust bearing comprising,
a rotor shaft; -
a collar member to be mounted to an outer periphery of the rotor shaft so as to be rotatable with the rotor shaft, the collar member having a collar body portion having a cylindrical shape and a flange portion formed to have a larger diameter than the collar body portion; a thrust bearing having an insertion hole into which the rotor shaft is inserted, the thrust bearing being configured to make slide contact with a first end surface of the flange portion of the collar member to support the rotor shaft which rotates in a state of being inserted into the insertion hole in an axial direction; an oil-supply channel for supplying lubricant oil to a sliding portion of the thrust bearing which makes slide contact with the first end surface of the flange portion; and an oil-drain space forming member disposed on a side of a first end surface of the thrust bearing, the oil-drain space forming member defining an oil-drain space through which the lubricant oil leaking from the sliding portion of the thrust bearing flows, between the thrust bearing and the oil-drain space forming member, wherein the oil-drain space includes; an oil-drain channel defined between the first end surface of the thrust bearing and a first end surface of the oil-drain space forming member, the oil-drain channel surrounding the flange portion of the collar member; and an oil-drain port formed below the oil-drain channel, for discharging the lubricant oil flowing through the oil-drain channel outside the oil-drain space, wherein the oil-drain space forming member comprises; a body portion including; a center hole into which the collar body portion of the collar member mounted to the rotor shaft is inserted; an inner peripheral edge portion which makes slide contact with a second end surface of the flange portion of the collar member at a radially outer side of the center hole; an intermediate portion formed on a radially outer side of the inner peripheral edge portion, with a gap from the first end surface of the thrust bearing; and an outer peripheral edge portion configured to make contact with the first end surface of the thrust bearing at a radially outer side of the intermediate portion; and a tongue portion extending obliquely downward from a lower end of the body portion toward the thrust bearing, wherein the oil-drain port is formed by a portion of the lower end of the body portion, the portion not having the outer peripheral edge portion formed thereon, and wherein the tongue portion is formed so as to increase a height of the oil-drain port from a side of a downstream edge toward a side of an upstream edge gradually, the height of the oil-drain port being defined as a vertical distance between the thrist bearing and the tongue portion. - View Dependent Claims (15)
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Specification