Connecting rod and internal combustion engine

Patent metadata

Field	Value
Publication number	US-9695745-B2
Application number	US-201615040054-A
Country	US
Kind code	B2
Filing date	Feb 10, 2016
Priority date	Mar 5, 2015
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A connecting rod ( 10 ) has a pin bearing eye connected to a crankshaft and a connecting rod bearing eye ( 12 ) connected to a piston. An eccentric adjusting device ( 13 ) adjusts an effective connecting rod length and has eccentric rods ( 15, 16 ) that act on an eccentric lever ( 14 ) of the adjusting device ( 13 ). The eccentric adjusting device ( 13 ) has an eccentric ( 36 ) guided in a recess of the lever ( 14 ) and a recess for receiving a gudgeon pin ( 37 ). Lubricating oil bores extend radially of the eccentric in the connecting rod bearing eye ( 12 ) and in the eccentric ( 36 ). Lubricating oil builds up via the lubricating oil bores between the connecting rod bearing eye ( 12 ) and the eccentric ( 36 ) and between the eccentric ( 36 ) and the gudgeon pin ( 37 ). Lubricating oil bores of the eccentric ( 36 ) are diametrically larger than lubricating oil bores of the connecting rod bearing eye ( 12 ).

First claim

What is claimed is:

1. A connecting rod, comprising: a pin bearing eye for connecting to a crankshaft and a connecting rod bearing eye for connecting to a piston of a cylinder, and an eccentric adjusting device for adjusting an effective connecting rod length, the eccentric adjusting device having eccentric rods that act on an eccentric lever of the eccentric adjusting device, the eccentric adjusting device having an eccentric that is guided in a bore or recess of the eccentric lever and that has a bore or recess for receiving a gudgeon pin, lubricating oil bores made in the connecting rod bearing eye and in the eccentric and extending in a radial direction of the eccentric and the connecting rod bearing eye, the lubricating oil bores enabling a lubricating oil film to be built up between the connecting rod bearing eye and the eccentric and between the eccentric and the gudgeon pin, each lubricating oil bore of the eccentric having a diameter D that is sufficiently greater than a diameter d of each lubricating oil bore of the connecting rod bearing eye so that 2d≧D>d.

2. The connecting rod of claim 1 , wherein in a first end position of the eccentric, a first lubricating oil bore of said eccentric and a first lubricating oil bore of the connecting rod bearing eye lie behind one another in the radial direction and, in a second end position of the eccentric, a second lubricating oil bore of said eccentric and a second lubricating oil bore of the connecting rod bearing eye lie behind one another in the radial direction so that a lubricating oil film can be built up between the eccentric and the gudgeon pin via the lubricating oil bores in the respective end position.

3. The connecting rod of claim 2 , wherein, in the first end position of the eccentric, the second lubricating oil bore of the eccentric and the second lubricating oil bore of the connecting rod bearing eye do not lie behind one another in the radial direction so that a lubricating oil film can be built up between the connecting rod bearing eye and the eccentric via the second lubricating oil bore of the connecting rod bearing eye in the first end position, and in the second end position of the eccentric, the first lubricating oil bore of the eccentric and the first lubricating oil bore of the connecting rod bearing eye do not lie behind one another in the radial direction so that a lubricating oil film can be built up between the connecting rod bearing eye and the eccentric via the first lubricating oil bore of the connecting rod bearing eye in the second end position.

4. The connecting rod of claim 3 , wherein the lubricating oil bores of the eccentric are displaced with respect to the lubricating oil bores of the connecting rod bearing eye so that, in the first end position of the eccentric, axes of the first lubricating oil bore of the eccentric and the first lubricating oil bore of the connecting rod bearing eye are offset circumferentially and, in a second end position of the eccentric, axes of the second lubricating oil bore of the eccentric and the second lubricating oil bore of the connecting rod bearing eye are offset in the circumferential direction of the eccentric and the connecting rod bearing eye.

5. The connecting rod of claim 4 , wherein, in the first end position, the displacement of the respective lubricating oil bore of the eccentric with respect to the respective lubricating oil bore of the connecting rod bearing eye is counter to an adjusting direction toward the second end position, and in the second end position, the displacement of the respective lubricating oil bore of the eccentric with respect to the respective lubricating oil bore of the connecting rod bearing eye is counter to an adjusting direction toward the first end position.

6. An internal combustion engine that has an adjustable compression ratio, having at least one cylinder and a crankshaft on which the connecting rod of claim 1 .

7. A connecting rod, comprising:
a pin bearing eye for connecting to a crankshaft;
a connecting rod bearing eye for connecting to a piston of a cylinder, first and second connecting rod lubricating oil bores formed in the connecting rod bearing eye and extending in a radial direction of the connecting rod bearing eye, each of the connecting rod lubricating oil bores having a diameter d;
an eccentric adjusting device for adjusting an effective connecting rod length, the eccentric adjusting device having eccentric rods that act on an eccentric lever of the eccentric adjusting device, the eccentric adjusting device having an eccentric that is guided in a bore or recess of the eccentric lever and that has a bore or recess for receiving a gudgeon pin, first and second eccentric lubricating oil bores formed in the eccentric and extending in a radial direction of the connecting rod bearing eye, each eccentric lubricating oil bore having a diameter D selected relative to the diameter d of each of the connecting rod lubricating oil bores so that 2d≧D>d, wherein
in a first end position of the eccentric, the first eccentric lubricating oil bore and the first lubricating oil bore radially overlap with the first eccentric lubricating oil bore extending to a side of the first connecting rod lubricating oil bore remote from the second lubricating oil bore, while the second eccentric lubricating oil bore and the second lubricating oil bore are not aligned
in a second end position of the eccentric, the second eccentric lubricating oil bore and the second lubricating oil bore radially overlap with the second eccentric lubricating oil bore extending to a side of the second connecting rod lubricating oil bore remote from the first lubricating oil bore, while the first eccentric lubricating oil bore and the first lubricating oil bore are not aligned, and
the lubricating oil bores enable a lubricating oil film between the connecting rod bearing eye and the eccentric and between the eccentric and the gudgeon pin.

Assignees

• Porsche Ag
• Porsche Ag

Inventors

• Paul Michael

Classifications

• F02B75/045 Primary

  by means of a variable connecting rod length · CPC title

• F16C7/06

  Adjustable connecting-rods · CPC title

• F16C9/04

  Connecting-rod bearings; Attachments thereof · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C23/10

  Bearings, parts of which are eccentrically adjustable with respect to each other · CPC title