Valve arrangement

Patent metadata

Field	Value
Publication number	US-10794334-B2
Application number	US-201616099456-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Jun 2, 2016
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A valve arrangement for supplying air to a combustion chamber of an internal combustion engine includes a first valve, the first valve including a first valve head, a first valve stem assembly and an internal cavity, which is at least partly located in the first valve stem assembly, and a second valve partly arranged within the internal cavity of the first valve, the second valve including a second valve head and a second valve stem assembly, and being movable within the internal cavity between an upper, closed position and a lower, open position, wherein a junction seal extends over a junction between the first valve stem assembly and the second valve stem assembly when the second valve is in the closed position. A leakage preventing arrangement is arranged to hinder leakage of liquid from the outside of the junction seal from reaching in between the first valve stem assembly and the second salve stem assembly.

First claim

The invention claimed is:

1. A valve arrangement for supplying air to a combustion chamber of an internal combustion engine, the valve arrangement comprising:
a first valve, the first valve comprising a first valve head, a first valve stem assembly and an internal cavity, which is at least partly located in the first valve stem assembly, the first valve being movable between an upper, closed position of the valve, and a lower, open position, in which open position air provided via an air intake is supplied to the combustion chamber past the first valve head;
a second valve partly arranged within the internal cavity of the first valve, the second valve comprising a second valve head and a second valve stem assembly, and being movable within the internal cavity between an upper, closed position, in which closed position the second valve head is in contact with an inner surface of the first valve head, and a lower, open position in which open position additional air may be supplied to the combustion chamber via the internal cavity past the second valve head, wherein at least one air inlet for supplying the additional air to the internal cavity is arranged along a circumference of the first valve stem assembly, at least one of the at least one air inlets being separately arranged from the air intake;
a stem joining device extending between the first valve stem assembly and the second valve stem assembly and allowing relative movement between the first valve stem assembly and the second valve stem assembly between the closed position and the open position of the second valve, the stem joining device extending over a junction between the first valve stem assembly and the second valve stem assembly so as to form a junction seal; and
a junction leakage preventing means being arranged to hinder leakage of liquid from the outside of the junction seal from reaching in between the first valve stem assembly and the second valve stem assembly.

2. A valve arrangement according to claim 1 , wherein the stem joining device comprises an upper washer and a lower washer.

3. A valve arrangement according to claim 2 , wherein the upper washer or the lower washer forms the junction seal.

4. A valve arrangement according to claim 2 , wherein the upper washer is arranged in connection to the second valve stem assembly, and/or the lower washer is arranged in connection to the first valve stem assembly.

5. A valve arrangement according to claim 2 , wherein a second spring member is arranged to act on the upper washer so as to bias the second valve stem assembly towards the closed position of the second valve.

6. A valve arrangement according to claim 2 , wherein a first spring member is arranged to act on the lower washer so as to bias the first valve stem assembly towards the closed position of the first valve.

7. A valve arrangement according to claim 1 , wherein the junction leakage preventing means comprises at least one member arranged on the outside of the junction seal.

8. A valve arrangement according to any one of the previous claims, wherein the junction leakage preventing means comprises a member being arranged upwards of the junction seal.

9. A valve arrangement according to claim 1 , wherein the junction leakage preventing means comprises a member being arranged to seal between the stem joining arrangement and the first or second valve stem assembly.

10. A valve arrangement according to claim 1 , wherein the junction leakage preventing means comprises a member being arranged inside the stem joining device.

11. A valve arrangement according to claim 9 , wherein the member forms a sealing member.

12. A valve arrangement according to claim 9 , wherein the member is compressible for allowing movement between the open and closed positions of the second valve.

13. A valve arrangement according to claim 1 , wherein the junction leakage preventing means comprises at least one member being arranged on the inside of the junction seal.

14. A valve arrangement according to claim 1 , wherein the junction leakage preventing means comprises a member being arranged between the first valve stem assembly and the second valve stem assembly, the member being arranged so as to form a protruding portion from the first valve stem assembly and the second valve stem assembly comprising a recess adapted to at least partially receive the protruding portion, when the second valve is in a fully open position.

15. A valve arrangement according to claim 1 , wherein the junction leakage preventing means comprises a member in the form of a circumferential cavity in the junction seal, the circumferential cavity opening towards the junction between the first and second valve stent assemblies.

16. A valve arrangement according to claim 1 , wherein the junction comprises a gap having a varying longitudinal extension between the closed and the open position of the second valve.

17. A valve arrangement according to claim 16 , wherein the second valve stem assembly comprises a valve tip, the valve tip comprising a downward abutment surface, and the first valve stem assembly comprising an upward abutment surface, facing the downward abutment surface, wherein the gap is formed between the downward and upward abutment surfaces.

18. A valve arrangement according to claim 1 , wherein a valve guide is arranged to surround a portion of the first valve stem assembly.

19. A valve arrangement according to claim 18 , wherein the valve guide comprises an air passage allowing supply of additional air to the combustion chamber via the internal cavity in the first valve, when the first valve is in its closed position.

20. A valve arrangement according to claim 19 , comprising a second leakage preventing means, for preventing liquid from leaking from a region externally of the first valve stem assembly to the valve guide air passage.

21. An internal combustion engine comprising a valve arrangement according to claim 1 .

22. A vehicle comprising an internal combustion engine according to claim 21 .

Assignees

• Volvo Truck Corp

Inventors

• Svensson Stig Arne
• Langervik Lennart

Classifications

• F01L1/28

  characterised by the provision of coaxial valves; characterised by the provision of valves co-operating with both intake and exhaust ports · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02B29/06

  After-charging, i.e. supplementary charging after scavenging · CPC title

• F02B29/00

  Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof · CPC title

• F02M23/006 Primary

  Valves specially shaped for supplying secondary air · CPC title