Lubricating oil supply structure

Patent metadata

Field	Value
Publication number	US-11028740-B2
Application number	US-202016783245-A
Country	US
Kind code	B2
Filing date	Feb 6, 2020
Priority date	Mar 15, 2019
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A lubricating oil supply structure includes: a shaft; a bearing supporting the shaft and having an oil supply port, through which lubricating oil is supplied to between the shaft and the bearing, and an oil introduction port, through which the lubricating oil is introduced; a first oil passage, connected to the oil supply port, distributing the lubricating oil from an oil pump toward the oil supply port; a second oil passage, connected to the oil introduction port, supplying the lubricating oil introduced through the oil introduction port to a supply destination; a connection oil passage, formed by a gap between the bearing and the shaft, connecting between the first oil passage and the second oil passage, and a throttle portion, formed on a part of the connection oil passage, suppressing a flow of the lubricating oil from the oil supply port toward the oil introduction port.

First claim

What is claimed is:

1. A lubricating oil supply structure, comprising:
a shaft;
a bearing having a bearing surface on which an oil groove that extends along a circumferential direction of the bearing, is formed, the bearing supports the shaft and has an oil supply port that is formed on the oil grove, through which a lubricating oil is supplied to between the shaft and the bearing, and an oil introduction port that is formed on the bearing surface and on an area other than an area where the oil groove is formed, through which the lubricating oil between the shaft and the bearing is introduced;
a first oil passage, which is connected to the oil supply port and distributes the lubricating oil from an oil pump toward the oil supply port;
a second oil passage, which is connected to the oil introduction port and supplies the lubricating oil introduced through the oil introduction port to a supply destination other than the bearing;
a connection oil passage, which is formed by a gap between the bearing and the shaft and connects between the first oil passage and the second oil passage; and
a throttle portion, formed on a part of the connection oil passage, configured to suppress a flow of the lubricating oil from the oil supply port toward the oil introduction port, the throttle portion being formed by a gap which is narrower than a gap between a part where the oil groove where the throttle portion is not formed and the shaft, wherein the connection oil passage passes through the oil groove and the throttle portion.

2. The lubricating oil supply structure according to claim 1 , wherein
an oil outlet port and an inlet port are formed on respective positions, which overlap with each other in an axial direction and differs from each other in a circumferential direction of the lubricating oil supply structure.

3. The lubricating oil supply structure according to claim 1 , wherein
an oil outlet port and an inlet port are formed on respective positions, which differs from each other in an axial direction of the lubricating oil supply structure.

4. The lubricating oil supply structure according to claim 1 , wherein
the shaft is a camshaft provided in an internal combustion engine,
the portion supported on the bearing is a cam journal of the camshaft, and
the supply destination is a cam shower which drops the lubricating oil to a cam lobe of the camshaft.

5. The lubricating oil supply structure according to claim 1 , wherein
the shaft is a crank shaft of an internal combustion engine,
the portion supported on the bearing is a crank journal of the crank shaft, and
the supply destination is a sprocket integrally rotating with the crank shaft.

6. A lubricating oil supply structure, comprising:
a shaft having an outer circumferential surface;
a bearing, which supports the shaft and has an oil supply port, through which a lubricating oil is supplied to between the shaft and the bearing, and an oil introduction port, through which the lubricating oil between the shaft and the bearing is introduced;
a first oil passage, which is connected to the oil supply port and distributes the lubricating oil from an oil pump toward the oil supply port;
a second oil passage, which is connected to the oil introduction port and supplies the lubricating oil introduced through the oil introduction port to a supply destination other than the bearing;
a connection oil passage, which is formed by a gap between the bearing and the shaft and connects between the first oil passage and the second oil passage; and
a throttle portion, formed on a part of the connection oil passage, configured to suppress a flow of the lubricating oil from the oil supply port toward the oil introduction port,
wherein:
an oil groove, extending along a circumferential direction of the shaft, is formed on a part of the outer circumferential surface, the part being supported by the bearing,
the oil supply port is formed on the bearing surface of the bearing and on a position facing the oil groove in a radial direction of the lubricating oil supply structure,
the oil introduction port is formed on the bearing surface and on a position which does not face the oil groove in the radial direction, and
the throttle portion is formed by a gap which is narrower than a gap between a part of the oil groove where the throttle portion is not formed and the bearing surface.

7. The lubricating oil supply structure according to claim 6 , wherein
an oil outlet port and an inlet port are formed on respective positions, which overlap with each other in an axial direction and differs from each other in a circumferential direction of the lubricating oil supply structure.

8. The lubricating oil supply structure according to claim 6 , wherein
an oil outlet port and an inlet port are formed on respective positions, which differs from each other in an axial direction of the lubricating oil supply structure.

9. The lubricating oil supply structure according to claim 6 , wherein
the shaft is a camshaft provided in an internal combustion engine,
the portion supported on the bearing is a cam journal of the camshaft, and
the supply destination is a cam shower which drops the lubricating oil to a cam lobe of the camshaft.

10. The lubricating oil supply structure according to claim 6 , wherein
the shaft is a crank shaft of an internal combustion engine,
the portion supported on the bearing is a crank journal of the crank shaft, and
the supply destination is a sprocket integrally rotating with the crank shaft.

Assignees

• Toyota Motor Co Ltd

Inventors

• Koyama Takashi

Classifications

• F01M11/02

  Arrangements of lubricant conduits · CPC title

• F01M1/16

  Controlling lubricant pressure or quantity (rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22) · CPC title

• F01L2810/02

  Lubrication · CPC title

• F01M9/105

  using distribution conduits · CPC title

• F01M2011/026

  for lubricating crankshaft bearings · CPC title