Internal combustion engine

Patent metadata

Field	Value
Publication number	US-9556803-B2
Application number	US-201314406118-A
Country	US
Kind code	B2
Filing date	Apr 11, 2013
Priority date	Apr 13, 2012
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

An internal combustion engine includes a piston axially displaced in a cylinder over a maximal stroke and a connecting rod device for adjusting the compression of the internal combustion engine and having a transverse lever with one end connected by a first joint with a connecting rod articulately arranged in the piston and another end connected by a second joint with an actuatable control lever pivotal about a third joint. The transverse lever is connected between the first joint and the second joint by a fourth joint with a crankpin of the crankshaft which is spaced apart from a rotation axis of the crankshaft, wherein a lateral distance between the rotation axis of the crankshaft and the third joint in relation to the maximal stroke of the piston is at least −1.0.

First claim

The invention claimed is:

1. An internal combustion engine comprising:
at least one piston axially displaceable in a cylinder over a maximal stroke; and
a connecting rod device for adjusting a compression of the internal combustion engine, said connecting rod device comprising a transverse lever having opposing ends and being connected on one of the opposing ends to a connecting rod via a first joint, and on the other one of the opposing ends being connected via a second joint with an actuatable control lever, said connecting rod being articulately arranged in the piston said control lever being arranged pivotal about a third joint, said transverse lever being connected between the first joint and the second joint with a crankpin of a crankshaft via a fourth joint, said crankpin being spaced apart from a rotation axis of the crankshaft, wherein a lateral distance between the rotation axis of the crankshaft and the third joint in relation to the maximal stroke of the piston is at least −1.0, in particular

−1.23 or −1.78 so that pivot angles of the connecting rod device are reduced and as a result a friction in the joints is reduced.

2. The internal combustion engine of claim 1 , wherein a distance of an eccentric section to the rotation axis in relation to the maximal stroke of the piston is at least 0.3, in particular 0.34 or 0.37.

3. The internal combustion engine of claim 1 , wherein a horizontal distance between the rotation axis and the third joint in relation to the maximal stroke of the piston is at least −0.6, in particular −0.65.

4. The internal combustion engine of claim 1 , wherein a distance between the second joint and the third joint in relation to the maximal stroke of the piston is at least 1.2, in particular 1.27 or 1.74.

5. The internal combustion engine of claim 1 , wherein a distance between the fourth joint and the second joint in relation to the maximal stroke of the piston is at least 1.3, in particular 1.32 or 1.64.

6. The internal combustion engine of claim 1 , wherein a distance between the first joint and the fourth joint in relation to the maximal stroke of the piston is at least 0.5, in particular 0.57 or 0.62.

7. The internal combustion engine of claim 1 , wherein a distance between the first joint and the piston in relation to the maximal stroke of the piston is at least 1.5, in particular 1.57 or 1.75.

8. The internal combustion engine of claim 1 , wherein a length of an angled portion of the transverse lever in relation to the maximal stroke of the piston is at least 0.3, in particular 0.41 or 0.47.

9. The internal combustion engine of claim 1 , wherein the maximal stroke of the piston is at least 84 mm, in particular 92.8 mm.

Assignees

• Audi Ag

Inventors

• Brendel Matthias
• Meyer Markus

Classifications

• F02B75/048

  by means of a variable crank stroke length · CPC title

• F02D15/02 Primary

  by alteration or displacement of piston stroke · CPC title

• F16J7/00

  Piston-rods · CPC title