Title of Invention

A CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE

Abstract A cylinder head (1) for an internal combustion engine with at least one intake port (3) which generates a tumble flow (S) in the combustion chamber (2), which channel is curved preferably in the direction of the tumble flow (S) and comprises a wall region (3a) which is external relative to the tumble flow (S) and an inner wall region (3b); with a valve seat ring (4) being arranged in the region of the opening (9) of the intake port (3) into the combustion chamber (2) and with the outer wall region (3a) in the area of the valve seat ring (4) being formed at least partly by an extension (11) of the cylinder head (1) within an inner jacket surface (4a) of the valve seat ring (4), characterized in that the inner jacket surface (4a) of the valve seat ring (4) is radially exposed relative to the extension (11).
Full Text FORM 2
THE PATENTS ACT 1970 [39 OF 1970]
COMPLETE SPECIFICATION
[See Section 10; rule 13 ]
"A CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE"
AVL LIST GMBH, an Austrian company of Hans-List-Platz 1, A-8020 Graz, Austria,
GRANTED
30-3-2005
The following specification particularly describes the nature of the invention and the manner in which it is to be performed:-
ORIGINAL
93/MUMNP/2004

A cylinder head for an internal combustion engine
The invention relates to a cylinder head for an internal combustion engine with at
least one intake port which generates a tumble flow in the combustion chamber,
which channel is curved preferably in the direction of the tumble flow and
comprises a wall region which is external relative to the tumble flow and an inner
wall region, with a valve seat ring being arranged in the region of the opening of
the intake port into the combustion chamber, '
Cylinder heads with intake ports producing a tumble flow are known from US 5,640,941 A, US 5,165,374 A, US 5,359,972 A or GB 2 165 886 A. Especially in the partial load region it is possible to favorably influence the progress of the combustion by the tumble flow and thus the fuel consumption and emission formation, with the highest possible tumble flow being desirable.
The amount of the tumble flow is relevantly determined by the position of the point of intersection of the central line of the intake port with the central line of the valve seat ring. The closer the point of intersection lies to the combustion chamber, the stronger the tumble flow. A strong inclination of the intake port relative to the central line of the valve seat ring allows for a strong tumble movement in the combustion chamber. A strong inclination of the central line of the flow of the intake port relative to the axis of the valve seat ring leads to the disadvantage however that the flow cross section of the intake port is strongly reduced, which has a disadvantageous effect especially in the full load range by a considerably reduced throughput. In designing the intake port it is therefore necessary to seek a compromise between high tumble flow in the partial load range and high throughput in the full load range.
From DE 1 295 274 B1 a gas exchange port of a cylinder head of an internal combustion engine is known in the opening region of which a valve seat ring is inserted which forms the inside curvature of the port wall at the core contact point, In one embodiment a wall region of the gas exchange port is formed in the region of the valve seat ring by an extension of the cylinder head within the valve seat ring. The valve seat ring is enclosed at least three sides directly by

cylinder head material. This leads to multiple pressings and high mechanical stresses in this region,
It is the object of the present invention to further develop a cylinder head of the kind mentioned above in such a way that a strong tumble flow can be produced without any substantial reduction of the flow cross section of the intake port whilst preventing tension peaks in the cylinder head.
This occurs in accordance with the invention in such a way that the outer wall region in the area of the valve seat ring is formed at least partly by an extension of the cylinder head within an inner jacket surface of the valve seat ring, with the inner jacket surface of the valve seat ring being exposed relative to the extension. This exposure effectively helps prevent multiple pressings in the region of the valve seat ring, It is preferably provided that a fictitious extension of the port wall of the intake port in the region of the extension intersects the valve seat ring in the region of the inner jacket surface, with the line of intersection, when seen in the direction of the axis of the valve seat ring, preferably lying at least partly in a half of the inner jacket surface on the valve seat side.
This measure ensures that the point of intersection between the central line of intake port and the central line of the valve seat ring has a very small distance from-the combustion chamber, thus producing a very strong tumble flow in the combustion chamber already at a iow inclination of the centra! line of the intake port relative to the central line of the valve seat ring. This maintains the highest possible throughput in the full load region.
In a further development of the invention it is provided that the valve seat ring is provided with a sharp-edged chamfering upstream of its narrowest flow cross section in the transitional region to the intake port. This allows achieving a high tumble movement As an alternative it may be provided that the valve seat ring is provided with a transitional radius continuously adjacent to the intake port upstream of its narrowest flow cross section in the transitional region to the intake port. This allows to provide the flow cross section of the intake port with a

design in the region of the opening which is as large as possible and to substantially prevent flow detachments.
The cylinder head in accordance with the invention can be removed in an especially advantageous manner from a steel ingot mold having a casting incline, thus allowing for a very simple production.
The invention is explained below in closer detail by reference to the drawings, wherein:
Fig. 1 shows a cylinder head in accordance with the invention in a cross-sectional view, and
Fig. 2 shows the detail II of Fig. 1,
The cylinder head 1 comprises at least one intake port 3 producing a tumble flow 5 in the combustion chamber 2. A valve seat ring 4 is arranged in the cylinder head 1 in the region of the opening 9 of the intake port 3 into the combustion chamber 3. The valve seat ring 4 forms the valve seat 5 for the intake valve 6. An exhaust valve is designated with reference numeral 7 and is used for controlling an exhaust port 8. The wall region of intake port 3 which is the outside one relative to the tumble flow S is designated with reference numerals 3a. The inner wall region is designated with reference numeral 3b. When seen in a norma! sectional view relative to the central line 3c of the port, the outer wall region 3a is spaced further away from the cylinder head plane 10 than the inner wall region 3b,
In order to produce the strongest possible tumble flow S in the combustion chamber 2, the cylinder head 1 is provided in the region of the opening 9 of the intake port 3 into the combustion chamber 2 with an extension 11 which extends into the hollow space 4b opened by the inner jacket surface 4a. The extension 11 which is situated within the inner jacket surface 4a is configured as an extension of the outer wall region 3a.
The fictitious extension 12 of the channel wall 13 in the region of the extension 11 intersects the valve seat ring 4 in the region of the inner jacket surface 4a,

with the lines of intersection 14 being situated at least partly in the half 4' of the valve seat ring 4 on the valve seat side. The half of the valve seat ring 4 which is averted from the valve seat 5 is designated with 4". The extension 11 per se extends at least partly up to a central plane 15 of the valve seat ring 4.
The extension 11 produces a displacement of the central line 3c of the intake port 3 in the direction of the cylinder head plane 10, thus displacing the point of intersection P between the central line 3c of the port and the central line 4c of the valve seat ring 4 towards the combustion chamber and reducing the distance L between the point of intersection P and the face surface 4d of the valve seat ring 4 on the combustion side.
Without the extension 11, a respective reduction of the distance L between the point of intersection P and the face surface 4d on the combustion chamber side which leads to an amplification of the tumble flow S could only be achieved via a respective relatively large angle of inclination 0 between the central line 3c of the port and the central line 4c of the valve seat ring 4, which would lead to the disadvantage of a considerable reduction in cross section of the intake port 3. The extension 11 allows for a strong tumbling movement S at a relatively low angle of inclination 0, as a result of which a high throughput can be achieved in full-load operation.
As a further measure for producing the largest possible flow cross section of the intake port 3, the valve seat ring 4 comprises a transitional radius 16 according to the inclination of the inner wall region 3b in the region of the transition between the inner jacket surface 4a and the face surface 4e on the cylinder head side. Instead of the transitional radius 16 it is also possible to provide a sharp-edged chamfer 16a, as a result of which the tumbling movement S can be increased. For the purpose of illustrating this, Fig. 2 shows the valve seat ring 4 in its left half with a chamfering 16a and its right half with a transitional radius 16. In practice, however, the valve seat ring 4 is configured either with a circular transitional radius 16 or with a circular chamfering 16.

We claim:
1. A cylinder head (1) for an internal combustion engine with at least one intake port (3) which generates a tumble flow (S) in the combustion chamber (2), which channel is curved preferably in the direction of the tumble flow (S) and comprises a wall region (3a) which is external relative to the tumble flow (S) and an inner wall region (3b); with a valve seat ring (4) being arranged in the region of the opening (9) of the intake port (3) into the combustion chamber (2) and with the outer wall region (3a) in the area of the valve seat ring (4) being formed at least partly by an extension (11) of the cylinder head (1) within an inner jacket surface (4a) of the valve seat ring (4), characterized in that the inner jacket surface (4a) of the valve seat ring (4) is radially exposed relative to the extension (11).
2. A cylinder head (1) as claimed in claim 1 wherein a fictitious extension (12) of the
'i
port wall (13) of the intake port (3) in the region of the extension (11) intersects the valve seat ring (4) in the region of the inner jacket surface (4a), with the line of intersection (14), when seen in the direction of the axis (4c) of the valve seat ring (4) preferably lying at least partly in a half (4') of the inner jacket surface (4a) on the
valve seat side.

3. A cylinder head (1) as claimed in claim 1, wherein the intake port (3) can be removed from a steel ingot mold having a casting incline.
4. A cylinder head (1) as claimed in claim 1, wherein the valve seat ring (4) is provided with a transitional radius (16) continuously adjacent to the intake port (3) upstream of its narrowest flow cross section in the transitional region to the intake port (3).
5. A cylinder head (1) as claimed in claim 1, wherein the valve seat ring (4) is provided with a sharp-edged chamfering (16a) upstream of its narrowest flow cross section in the transitional region to the intake port.
Dated this :06th day of February, 2004.
RITUSHKA NEGI
OF REMFRY & SAGAR
ATTORNEY FOR THE APPLICANTS

Documents:

00093-mumnp-2004-cancelled pages(30-3-2005).pdf

00093-mumnp-2004-claims(granted)-(30-3-2005).doc

00093-mumnp-2004-claims(granted)-(30-3-2005).pdf

00093-mumnp-2004-correspondence(22-3-2006).pdf

00093-mumnp-2004-correspondence(ipo)-(16-11-2006).pdf

00093-mumnp-2004-drawing(30-3-2005).pdf

00093-mumnp-2004-form 1(6-2-2004).pdf

00093-mumnp-2004-form 19(10-3-2004).pdf

00093-mumnp-2004-form 2(granted)-(30-3-2005).doc

00093-mumnp-2004-form 2(granted)-(30-3-2005).pdf

00093-mumnp-2004-form 3(30-3-2005).pdf

00093-mumnp-2004-form 3(6-2-2004).pdf

00093-mumnp-2004-form 3(7-5-2004).pdf

00093-mumnp-2004-form 5(6-2-2004).pdf

00093-mumnp-2004-form-pct-isa-210(6-2-2004).pdf

00093-mumnp-2004-petition under rule 137(30-3-2005).pdf

00093-mumnp-2004-power of authority(8-6-2004).pdf

abstract1.jpg


Patent Number 203057
Indian Patent Application Number 93/MUMNP/2004
PG Journal Number 43/2008
Publication Date 24-Oct-2008
Grant Date 16-Nov-2006
Date of Filing 06-Feb-2004
Name of Patentee AVL LIST GMBH
Applicant Address HANS-LIST-PLATZ 1, A-8020 GRAZ,
Inventors:
# Inventor's Name Inventor's Address
1 FRANZ LAIMBOCK WALDSDORFBERG 86, A-8051 THAL,
PCT International Classification Number N/A
PCT International Application Number PAT/AT02/00232
PCT International Filing date 2002-08-01
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 GM 609/2001 2001-08-02 Austria