Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio

Patent metadata

Field	Value
Publication number	US-9309831-B2
Application number	US-201214350246-A
Country	US
Kind code	B2
Filing date	Sep 4, 2012
Priority date	Oct 8, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A piston arrangement for a combustion chamber of an internal combustion engine having a variable compression ratio. A piston includes a device for the variable adjustment of the compression ratio associated with the combustion chamber, and a piston pin is coupled to the piston via respective connecting regions, via which piston pin the piston can be coupled to a connecting rod of the internal combustion engine. The device includes the piston pin having at least one eccentric element, which is eccentrically arranged with respect to the connecting regions of the piston pin and via which the piston pin can be coupled to the connecting rod.

First claim

The invention claimed is:

1. A piston arrangement for a combustion chamber of an internal combustion engine having a variable compression ratio, comprising:
a piston;
a device configured for the variable adjustment of the compression ratio associated with the combustion chamber, the device comprising
a piston pin coupled to the piston by respective connecting regions, wherein the piston pin is configured is to couple the piston to a connecting rod of the internal combustion engine, wherein the piston pin has at least one eccentric element eccentrically arranged with respect to the connecting region of the piston pin and is configured to couple the piston pin to the connecting rod,
at least one control element, which is held on the piston in such a manner that it is movable relative to the piston pin and the piston between at least two positions, wherein the at least one control element is displaceable at an angle or perpendicular to a longitudinal extension of the piston pin, wherein displacement of the at least one control element controls whether the piston pin rotates relative to the piston, and
a blocking element accommodated in the piston pin, wherein the blocking element is perpendicularly displaceable relative to the longitudinal extension of the piston pin between at least one release position and at least one blocking position, wherein in the release position of the blocking element the piston pin is rotatable relative to the piston and in the blocking position, in which the blocking element interacts with the piston, the piston pin is not rotatable relative to the piston, wherein the blocking element is moveable by the control element between the release position corresponding to the first position of the control element and the blocking position corresponding to the second position of the control element,

wherein a lubricant of the internal combustion engine is suppliable to the blocking element via the control element to move the blocking element, and
wherein the supply of the medium to the blocking element is controlled by the control element.

2. The piston arrangement according to claim 1 , wherein the lubricant is supplied to the blocking element via at least one first channel provided on the piston, wherein the at least one first channel is in fluid connection with at least one second channel provided on the piston pin to conduct the lubricant.

3. The piston arrangement according to claim 2 , wherein the first channel is integrated directly into the piston.

4. The piston arrangement according to claim 2 , wherein the control element is configured so that supply of the lubricant to the first channel is allowed in one of the positions of the control element and prevented in the other position.

5. The piston arrangement according to claim 3 , wherein the control element is configured so that supply of the lubricant to the first channel is allowed in one of the positions of the control element and prevented in the other position.

6. An internal combustion engine, comprising:
a piston arrangement for a combustion chamber of the internal combustion engine having a variable compression ratio, the piston arrangement comprising
a piston;
a device configured for the variable adjustment of the compression ratio associated with the combustion chamber, the device comprising
a piston pin coupled to the piston by respective connecting regions, wherein the piston pin is configured is to couple the piston to a connecting rod of the internal combustion engine, wherein the piston pin has at least one eccentric element eccentrically arranged with respect to the connecting region of the piston pin and is configured to couple the piston pin to the connecting rod,
at least one control element, which is held on the piston in such a manner that it is movable relative to the piston pin and the piston between at least two positions, wherein the at least one control element is displaceable at an angle or perpendicular to a longitudinal extension of the piston pin, wherein displacement of the at least one control element controls whether the piston pin rotates relative to the piston, and
a blocking element accommodated in the piston pin, wherein the block element is perpendicularly displaceable relative to the longitudinal extension of the piston pin between at least one release position and at least one blocking position, wherein in the release position of the blocking element the piston pin is rotatable relative to the piston and in the blocking position, in which the blocking element interacts with the piston, the piston pin is not rotatable relative to the piston, wherein the blocking element is moveable by the control element between the release position corresponding to the first position of the control element and the blocking position corresponding to the second position of the control element,

wherein a lubricant of the internal combustion engine is suppliable to the blocking element via the control element to move the blocking element, and
wherein the supply of the medium to the blocking element is controlled by the control element.

7. The internal combustion engine according to claim 6 , wherein the piston has at least one passage penetrating an outer peripheral lateral surface of the piston and via which the lubricating oil of the internal combustion engine is suppliable to the control element from outside the piston in order to move the control element between the release and blocking positions.

Assignees

• Nowak Dieter
• Roemheld Tilmann
• Wagenplast Michael
• Daimler Ag

Inventors

• Nowak Dieter
• Roemheld Tilmann
• Wagenplast Michael

Classifications

• F02B75/045

  by means of a variable connecting rod length · CPC title

• F02B75/044 Primary

  by means of an adjustable piston length · CPC title

• F02D15/02

  by alteration or displacement of piston stroke · CPC title

• F02F3/0069 Primary

  the crown and skirt being interconnected by the gudgeon pin · CPC title