Connecting rod for an internal combustion engine with variable compression

Patent metadata

Field	Value
Publication number	US-10655535-B2
Application number	US-201815997424-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Jun 23, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A connecting rod for a variable compression internal combustion engine, the connecting rod including a crank bearing eye configured to connect the connecting rod to a crankshaft of the variable compression internal combustion engine; a connecting rod bearing eye configured to connect the connecting rod to a cylinder piston of the variable compression internal combustion engine; an eccentrical element adjustment arrangement configured to adjust an effective connective rod length, which eccentrical element adjustment arrangement includes an eccentrical element that is connected torque proof with an eccentrical element lever, wherein a wrist pin of the cylinder piston is receivable in the eccentrical element, wherein the eccentrical element adjustment arrangement includes two hydraulic chambers respectively including a piston that is movably arranged in a cylindrical borehole and connected with a support rod which is connected with the eccentrical element lever at another end, wherein the support rod is configured from plural components.

First claim

What is claimed is:

1. A connecting rod for a variable compression internal combustion engine, the connecting rod comprising:
a crank bearing eye configured to connect the connecting rod to a crankshaft of the variable compression internal combustion engine;
a connecting rod bearing eye configured to connect the connecting rod to a cylinder piston of the variable compression internal combustion engine; and
an eccentrical element adjustment arrangement configured to adjust an effective connective rod length, which eccentrical element adjustment arrangement includes an eccentrical element that is connected torque proof with an eccentrical element lever,
wherein the eccentrical element adjustment arrangement includes two hydraulic chambers respectively including a piston that is movably arranged in a cylindrical borehole and connected with a support rod which is connected with the eccentrical element lever at another end,
wherein the support rod is configured from plural components,
wherein the support rod is configured as an assembled support rod,
wherein the support rod includes a rod element with a pivot link element arranged at one end and a piston connector arranged at another end, and
wherein the rod element is connected with the pivot link element and the piston connector by a friction weld,
wherein the piston connector is configured as a ball,
wherein the rod element is configured as a tubular rod element,
wherein the pivot link element is configured as a tubular sleeve whose longitudinal axis is configured perpendicular to a longitudinal axis of the tubular rod element, and wherein the tubular sleeve is welded to the tubular rod element by a friction weld,
wherein the link element includes an impressed bearing bushing.

2. The connecting rod according to claim 1 , wherein a cross section of the rod element is configured polygonal.

3. The connecting rod according to claim 1 , wherein the piston connector is secured by a safety ring against sliding out of the piston.

4. The connecting rod according to claim 1 ,
wherein the piston includes an undercut,
wherein the piston connector is secured against sliding out of the piston, and
wherein the piston connector is fixated in the piston by a cover.

5. The connecting rod according to claim 4 , wherein the cover is connected with the piston by welding or folding or impressing.

6. The connecting rod according to claim 1 , wherein the rod element is configured integrally in one piece with the pivot link element.

7. A method for producing the connecting rod according to claim 1 , the method comprising the steps:
producing a support rod including a pivot link element, a rod element and a piston connector;
attaching at least the pivot link element or at least the piston connector at least at one end of the rod element; and
establishing a fixed connection therewith.

8. The method according to claim 7 , wherein the support rod is connected at least with the pivot link element or at least the piston connector by a friction welding method.

9. The method according to claim 7 ,
wherein the rod element is produced integrally in one piece together with the pivot link element or the piston connector, or
wherein the piston connector or the pivot link element is connected with the rod element as a separate component.

10. The method according to claim 7 , wherein a piston is slid onto the rod element before finishing the rod element and the piston connector with the slid-on piston is connected with the rod element.

11. A variable compression internal combustion engine, comprising at least one connecting rod according to claim 1 .

Assignees

• ECO Holding 1 GmbH

Inventors

• Huber David
• Schulze Dietmar
• Mudra Alexander

Classifications

• F16C7/06

  Adjustable connecting-rods · CPC title

• F15B15/06

  for mechanically converting rectilinear movement into non- rectilinear movement · CPC title

• B23K2103/18

  Dissimilar materials · CPC title

• F15B2211/7107

  the output members being mechanically linked · CPC title

• F15B11/20

  controlling several interacting or sequentially-operating members · CPC title