Hydraulic support element

Patent metadata

Field	Value
Publication number	US-11459915-B2
Application number	US-201816619238-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Jun 7, 2017
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

This disclosure relates to a hydraulic support element for a switchable rocker arm of a valve train of an internal combustion engine. The hydraulic support element includes a cup-shaped cylinder, within which a hollow piston is arranged in an axially displaceable manner. The piston includes a filter cartridge which is in the form of a hollow body and can be charged from the outside with pressurized oil and an interior space of which is connected to an outlet opening of the contact head. An interior space of the piston has two pressurized oil chambers, including a first pressurized oil chamber above the piston head and connected to a first pressurized oil feed, and a second pressurized oil chamber formed under the contact head and connected to a second pressurized oil feed. The filter cartridge is tubular and located in the second pressurized oil chamber.

First claim

The invention claimed is:

1. A hydraulic support element for a switchable finger follower of a valve train of an internal combustion engine, the hydraulic support element comprising:
a cup-shaped cylinder with a base arranged at a cylinder end,
a hollow piston arranged in an axially movable manner within the cup-shaped cylinder, the hollow piston having:
a piston head facing the base,
a contact head arranged at a free end of the hollow piston, the contact head configured to support the finger follower, and
an interior space fluidly connected to an outlet opening formed in the contact head,
a filter cartridge formed as a tubular body, the filter cartridge configured to be charged from outside the filter cartridge with pressurized oil and an interior space of the filter cartridge fluidly connected to the outlet opening of the contact head and,
the interior space of the hollow piston having a first pressurized oil chamber and a second pressurized oil chamber separated from each other by a partition element, the first pressurized oil chamber arranged above the piston head and fluidly connected to a first pressurized oil feed, and the second pressurized oil chamber formed under the contact head and fluidly connected to a second pressurized oil feed, and
a first end of the filter cartridge sealingly located on the partition element in the second pressurized oil chamber, and a second end of the filter cartridge fluidly connected to the outlet opening of the contact head.

2. The hydraulic support element as claimed in claim 1 , wherein the filter cartridge has a sealing collar at each of its two ends, a first sealing collar associated with the first end of the filter cartridge is sealingly located on the partition element and a second sealing collar associated with the second end of the filter cartridge is sealingly located against an inner wall of the contact head.

3. The hydraulic support element as claimed in claim 1 , wherein the filter cartridge is mounted by means of the first end on a tubular protuberance of the partition element, the protuberance being directed toward the second pressurized oil chamber, and the second end of the filter cartridge carries a sealing sleeve, which is sealingly located against an inner wall of the contact head.

4. The hydraulic support element as claimed in claim 1 , wherein the partition element has a restriction orifice which connects the first pressurized oil chamber to the second pressurized oil chamber.

5. The hydraulic support element of claim 4 , wherein the restriction orifice is arranged between the second pressurized oil feed and the contact head.

6. The hydraulic support element as claimed in claim 1 , wherein the first and second pressurized oil feeds each comprise:
a feed opening formed in a wall of the cylinder, the feed opening configured to be connected to a pressurized oil line,
at least one inlet opening formed in a wall of the hollow piston, and
an annular space formed between the wall of the cylinder and the wall of the hollow piston, the annular space having an axial extent that connects the feed opening and the at least one inlet opening.

7. A hydraulic support element for a switchable finger follower of a valve train of an internal combustion engine, the hydraulic support element comprising:
a cup-shaped cylinder with a base arranged at a cylinder end,
a hollow piston arranged in an axially movable manner within the cup-shaped cylinder, the hollow piston having:
a piston head facing the base,
a contact head arranged at a free end of the hollow piston, the contact head configured to support the finger follower, and
an interior space fluidly connected to an outlet opening formed in the contact head,
a filter cartridge formed as a tubular body disposed within the interior space, the filter cartridge configured to be charged from outside the filter cartridge with pressurized oil and an interior space of the filter cartridge fluidly connected to the outlet opening of the contact head and,
the interior space of the hollow piston having two pressurized oil chambers separated from each other by a partition element, a first end of the filter cartridge sealingly located on the partition element, and a second end of the filter cartridge fluidly connected to the outlet opening of the contact head.

8. The hydraulic support element of claim 7 , wherein the filter cartridge is configured to be charged from outside the filter cartridge with pressurized oil from one of the two pressurized oil chambers formed between the contact head and the partition element.

9. The hydraulic support element as claimed in claim 7 , wherein the partition element has a restriction orifice which connects the two pressurized oil chambers.

10. A hydraulic support element for a switchable finger follower of a valve train of an internal combustion engine, the hydraulic support element comprising:
a cup-shaped cylinder with a base arranged at a cylinder end,
a hollow piston arranged to move axially within the cup-shaped cylinder, the hollow piston having:
a piston head facing the base, a first pressurized oil chamber formed between the piston head and base,
a contact head arranged at a free end of the hollow piston, the contact head configured to support the finger follower, and
an interior space having a second pressurized oil chamber and a third pressurized oil chamber, the second pressurized oil chamber arranged between the first and third pressurized oil chambers, and
a filter cartridge formed as a tubular body disposed within the third pressurized oil chamber, the filter cartridge configured to be charged from outside the filter cartridge with pressurized oil and an interior space of the filter cartridge fluidly connected to an outlet opening of the contact head.

11. The hydraulic support element of claim 10 , wherein a length of the tubular body is greater than a diameter of the tubular body.

12. The hydraulic support element of claim 10 , further comprising a check valve arranged between the first and second pressurized oil chambers.

13. The hydraulic support element of claim 12 , wherein the first, second, and third pressurized oil chambers are fluidly connected with each other when the check valve is in an open state.

14. The hydraulic support element of claim 10 , further comprising a first oil feed fluidly connected to: i) the second pressurized oil chamber; and, ii) the first pressurized oil chamber via the second pressurized oil chamber and a check valve, the check valve arranged between the first and second pressurized oil chambers.

15. The hydraulic support element of claim 14 , further comprising a second oil feed fluidly connected to the third pressurized oil chamber.

16. The hydraulic support element of claim 15 , wherein the second oil feed is arranged between the first oil feed and the outlet opening of the contact head.

Assignees

• Schaeffler Technologies Ag

Inventors

• Schnell Oliver
• Sailer Peter
• Witter Oliver

Classifications

• F01L1/146

  Push-rods · CPC title

• F01L1/185

  Overhead end-pivot rocking arms · CPC title

• F01L13/0005 Primary

  Deactivating valves · CPC title

• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• F01L2001/34426

  Oil control valves · CPC title