Internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016333780-A1
Application number	US-201615151669-A
Country	US
Kind code	A1
Filing date	May 11, 2016
Priority date	May 15, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

The internal combustion engine comprises: operating members and operating by a predetermined pressure or more of oil pressure; a hydraulic oil path supplying hydraulic oil to the operating members through crank journals; a lubricating oil path supplying lubricating oil to crankpins through the crank journals; a hydraulic control valve linearly controlling an oil pressure supplied to the operating members due to change of that opening degree; and a control device. The control device controls the opening degree of the hydraulic control valve so that when operating the operating members, the predetermined pressure or more of oil pressure is supplied to the operating members, and controls the opening degree of the hydraulic control valve so that when not operating the operating members, less than the predetermined pressure of oil pressure is supplied to the operating members.

First claim

1 . An internal combustion engine comprising
operating members provided at a connecting rod and operating by a predetermined pressure or more of oil pressure, a hydraulic oil path supplying hydraulic oil from an oil feed device to the operating members through part of crank journals among a plurality of crank journals, and a lubricating oil path supplying lubricating oil from the oil feed device to crankpins through the remaining crank journals among the plurality of crank journals, characterized in that the internal combustion engine further comprises a hydraulic control valve provided in the hydraulic oil path and linearly controlling oil pressure supplied to the operating members due to change of that opening degree, and a control device controlling the opening degree of the hydraulic control valve, and that the control device controls the opening degree of the hydraulic control valve so that when operating the operating members, the predetermined pressure or more of oil pressure is supplied to the operating members, and controls the opening degree of the hydraulic control valve so that when not operating the operating members, less than the predetermined pressure of oil pressure is supplied to the operating members.

2 . The internal combustion engine according to claim 1 , wherein if the control device does not operate the operating members, the control device makes the opening degree of the hydraulic control valve smaller when a temperature of the hydraulic oil is relatively low compared with when the temperature of the hydraulic oil is relatively high, and makes the opening degree of the hydraulic control valve smaller when an engine speed is relatively high compared with when the engine speed is relatively small.

3 . The internal combustion engine according to claim 1 , wherein the engine further comprises a hydraulic sensor provided in the hydraulic oil path at the operating member side from the hydraulic control valve and detecting an oil pressure supplied to the operating members, and the control device controls the opening degree of the hydraulic control valve based on an output of the hydraulic sensor.

4 . The internal combustion engine according to claim 2 , wherein the engine further comprises a hydraulic sensor provided in the hydraulic oil path at the operating member side from the hydraulic control valve and detecting an oil pressure supplied to the operating members, and the control device controls the opening degree of the hydraulic control valve based on an output of the hydraulic sensor.

5 . The internal combustion engine according to claim 1 , wherein the hydraulic oil path is communicated with the lubricating oil path at a position at an upstream side from the part of crank journals in a direction of oil flow and at a downstream side of the hydraulic control valve in the direction of oil flow so that an oil pressure of less than the predetermined pressure is supplied from the lubricating oil path to the part of crank journals when the lubricating oil path is supplied with the lubricating oil.

6 . The internal combustion engine according to claim 2 , wherein the hydraulic oil path is communicated with the lubricating oil path at a position at an upstream side from the part of crank journals in a direction of oil flow and at a downstream side of the hydraulic control valve in the direction of oil flow so that an oil pressure of less than the predetermined pressure is supplied from the lubricating oil path to the part of crank journals when the lubricating oil path is supplied with the lubricating oil.

7 . The internal combustion engine according to claim 3 , wherein the hydraulic oil path is communicated with the lubricating oil path at a position at an upstream side from the part of crank journals in a direction of oil flow and at a downstream side of the hydraulic control valve in the direction of oil flow so that an oil pressure of less than the predetermined pressure is supplied from the lubricating oil path to the part of crank journals when the lubricating oil path is supplied with the lubricating oil.

8 . The internal combustion engine according to claim 4 , wherein the hydraulic oil path is communicated with the lubricating oil path at a position at an upstream side from the part of crank journals in a direction of oil flow and at a downstream side of the hydraulic control valve in the direction of oil flow so that an oil pressure of less than the predetermined pressure is supplied from the lubricating oil path to the part of crank journals when the lubricating oil path is supplied with the lubricating oil.

9 . The internal combustion engine according to claim 1 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

10 . The internal combustion engine according to claim 2 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

11 . The internal combustion engine according to claim 3 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

12 . The internal combustion engine according to claim 4 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

13 . The internal combustion engine according to claim 5 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

14 . The internal combustion engine according to claim 6 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

15 . The internal combustion engine according to claim 7 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil path and lubricating oil path, the hydraulic oil is supplied from the main gallery to the part of crank journals, and the lubricating oil is supplied from the main gallery to the remaining crank journals.

16 . The internal combustion engine according to claim 8 , wherein a main gallery formed in a cylinder block is formed with two passages, these passages respectively form parts of the hydraulic oil

Assignees

• Toyota Motor Co Ltd

Inventors

• Kamo Yoshiro
• Ezaki Shuichi
• Kidooka Akio

Classifications

• F01M2011/026

  for lubricating crankshaft bearings · CPC title

• F02B75/045 Primary

  by means of a variable connecting rod length · CPC title

• F01M1/16

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

• F01M11/02

  Arrangements of lubricant conduits · CPC title

• F02D15/02 Primary

  by alteration or displacement of piston stroke · CPC title