Connecting rod for internal combustion engine with variable compression eccentrical element adjustment device

Patent metadata

Field	Value
Publication number	US-10100725-B2
Application number	US-201715431963-A
Country	US
Kind code	B2
Filing date	Feb 14, 2017
Priority date	Mar 16, 2016
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment device for adjusting an effective connecting rod length, the connecting rod including a connecting rod body; and a connecting rod cover arranged at the connecting rod body, wherein the connecting rod body and the connecting rod cover envelop a crank bearing eye, wherein the eccentrical element adjustment device includes two cylinders with a respective piston that is displaceably supported in a respective cylinder bore hole and connected with a respective support rod, wherein a respective inlet is provided for supplying hydraulic fluid to each of the two cylinders, wherein a respective outlet is provided for draining the hydraulic fluid from each of the two cylinders, wherein the connecting rod body includes at least two connecting rod body grooves for connecting each respective inlet with a hydraulic fluid loop, wherein the at least two connecting rod body grooves are arranged so that a highly loaded portion of the connecting rod bearing eye is not provided with the at least two connecting rod body grooves.

First claim

What is claimed is:

1. A connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment device for adjusting an effective connecting rod length, the connecting rod comprising:
a connecting rod body; and
a connecting rod cover arranged at the connecting rod body,
wherein the connecting rod body and the connecting rod cover envelop a crank bearing eye,
wherein the eccentrical element adjustment device includes two cylinders with a respective piston that is displaceably supported in a respective cylinder bore hole and connected with a respective support rod,
wherein a respective inlet is provided for supplying hydraulic fluid to each of the two cylinders,
wherein a respective outlet is provided for draining the hydraulic fluid from each of the two cylinders,
wherein the connecting rod body includes at least two connecting rod body grooves for connecting each respective inlet with a hydraulic fluid loop,
wherein the at least two connecting rod body grooves are arranged so that a highly loaded portion of the connecting rod bearing eye is not provided with the at least two connecting rod body grooves.

2. The connecting rod according to claim 1 ,
wherein the at least two connecting rod body grooves are offset from each other at an inner circumference of the crank bearing eye and arranged at least on a first portion of the inner circumference of the crank bearing eye in a portion of the connecting rod body to supply each respective inlet with the hydraulic fluid.

3. The connecting rod according to claim 1 , wherein the at least two connecting rod body grooves are respectively arranged offset from a center longitudinal axis of the connecting rod body.

4. The connecting rod according to claim 1 , wherein each respective inlet is connected with each of the at least two connecting rod body grooves.

5. The connecting rod according to claim 1 , wherein each respective inlet includes at least one intersection in the connecting rod body between the two cylinders and the at least two connecting rod body grooves so that a fluid connection is provided between each respective inlet at the at least one intersection.

6. The connecting rod according to claim 1 ,
wherein at least one connecting rod cover groove is arranged on at least one second portion of the inner circumference of the crank bearing eye in a portion of the connecting rod cover,
wherein the at least one connecting rod cover groove is provided for hydraulically connecting the at least two connecting rod body grooves.

7. The connecting rod according to claim 1 ,
wherein a bearing shell is arranged in the crank bearing eye,
wherein one or two bearing shell grooves are arranged at least on a portion of an inner circumference of the bearing shell, and
wherein the one or two bearing shell grooves provide a hydraulic connection of the at least two connecting rod body grooves of the connecting rod body with each other.

8. The connecting rod according to claim 1 , wherein an adjustment travel of the eccentrical element adjustment device is adjustable by a switch valve.

9. The connecting rod according to claim 8 ,
wherein the switch valve is provided for controlling a hydraulic fluid flow and displaceable into a first switching condition or a second switching condition,
wherein a respective outlet of a first cylinder of the two cylinders is connected through the crank bearing eye of the connecting rod with the hydraulic fluid loop in the first switching position, and
wherein an outlet of a second cylinder of the two cylinders is connected through the crank bearing eye of the connecting rod with the hydraulic fluid loop in the second switching position.

10. The connecting rod according to claim 8 , wherein a valve housing of the switch valve is arranged at or in the connecting rod body or the connecting rod cover.

11. The connecting rod according to claim 8 , wherein the valve housing is provided as an adapter at the connecting rod cover.

12. The connecting rod according to claim 8 ,
wherein each respective outlet extend from a respective cylinder bore hole through the connecting rod body and the connecting rod cover and leads into a respective drain conduit of the switch valve at a side of the connecting rod cover that is oriented away from the lift bearing eye.

13. The connecting rod according to claim 8 , wherein at least one conduit is arranged in the connecting rod cover for connecting the switch valve with the at least one connecting rood cover groove of the crank bearing eye.

14. The connecting rod according to claim 9 ,
wherein a capture element of the switch valve is provided for controlling the hydraulic fluid flow in the switch valve, and
wherein the capture element is interlockable in the first switching condition or the second switching condition by a spring loaded interlocking element.

15. The connecting rod according to claim 14 , wherein a spring of the interlocking element is at least partially supported in a recess of the connecting rod cover when the valve housing is mounted at the connecting rod cover.

16. A connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment device for adjusting an effective connecting rod length, the connecting rod comprising:
a connecting rod body; and
a connecting rod cover arranged at the connecting rod body,
wherein the connecting rod body and the connecting rod cover envelop a crank bearing eye,
wherein the eccentrical element adjustment device includes a cylinder with a piston that is displaceably supported in a cylinder bore hole and connected with a support rod,
wherein an inlet is provided for supplying hydraulic fluid to the cylinder,
wherein an outlet is provided for draining the hydraulic fluid from the cylinder,
wherein the connecting rod body includes two connecting rod body grooves for connecting the inlet with a hydraulic fluid loop,
wherein the two connecting rod body grooves are arranged so that a highly loaded portion of the connecting rod bearing eye is not provided with the two connecting rod body grooves.

Assignees

• ECO Holding 1 GmbH

Inventors

• Jung Christian
• Mudra Alexander
• Schulze Dietmar

Classifications

• F02B75/045 Primary

  by means of a variable connecting rod length · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C7/06

  Adjustable connecting-rods · CPC title

• F02D15/02

  by alteration or displacement of piston stroke · CPC title

• F02B75/32

  Engines characterised by connections between pistons and main shafts and not specific to preceding main groups · CPC title