EP0085058B1 - Cooled valve seat insert, preferably for exhaust valves for diesel engines - Google Patents

Cooled valve seat insert, preferably for exhaust valves for diesel engines Download PDF

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Publication number
EP0085058B1
EP0085058B1 EP19820902067 EP82902067A EP0085058B1 EP 0085058 B1 EP0085058 B1 EP 0085058B1 EP 19820902067 EP19820902067 EP 19820902067 EP 82902067 A EP82902067 A EP 82902067A EP 0085058 B1 EP0085058 B1 EP 0085058B1
Authority
EP
European Patent Office
Prior art keywords
insert
cooling medium
valve seat
ducts
blind holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19820902067
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0085058A1 (en
Inventor
Jan Bechmann Johansen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
INTERNATIONAL POWER ENGINEERING AS
Original Assignee
INTERNATIONAL POWER ENGINEERING AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by INTERNATIONAL POWER ENGINEERING AS filed Critical INTERNATIONAL POWER ENGINEERING AS
Publication of EP0085058A1 publication Critical patent/EP0085058A1/en
Application granted granted Critical
Publication of EP0085058B1 publication Critical patent/EP0085058B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/12—Cooling of valves
    • F01L3/16—Cooling of valves by means of a fluid flowing through or along valve, e.g. air
    • F01L3/18—Liquid cooling of valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a valve seat insert, preferably for Diesel engines, wherein the insert is provided with means for circulating cooling medium adjacent the valve seat of the insert concerned.
  • valve seat inserts with a circumferentially extending cooling chamber which extends around the stationary seat of the valve and which is fed in different ways with a cooling medium in such a way that the cooling medium is circulated through the circumferentially extending chamber, no matter whether the inserts are constructed as so-called valve baskets with guidings for the stem of the exhaust valve, or are in the form of separate bottom elements which support the stationary seat of the valve and are clamped between the cylinder head of the engine and the housing for the spindle of the exhaust valve.
  • the insert according to the present invention is characterized in that the means for circulating the cooling liquid comprise blind holes, the bottoms of which are arranged adjacent the valve seat of the insert concerned and which open into an annular duct in the insert, the blind holes being by means of guiding baffles inserted therein divided into a feeding duct and a return duct which communicate at the bottoms of the blind holes concerned, and in that the annular duct is divided by partition means into cooling medium inlet and cooling medium outlet chambers which communicate with the feeding ducts and the return ducts, respectively, of the blind holes.
  • the guiding baffles may be inserted generally radially in the blind holes with respect to the longitudinal axis of the corresponding valve, and the partition means may consist of parts of the guiding baffles having the same circumferential shape as the annular duct.
  • This embodiment is advantageous because it is achieved that the guiding baffles and the partition means may be manufactured integrally with each other and the shaping and the arrangement of the guiding baffles result in that a cooling medium which flows to a cooling medium inlet chamber in the annular duct will be forced to flow into and out of blind holes following each other and along a generally meander shaped path of flow.
  • valve seat insert is characterized in that the guiding baffles are inserted in the blind holes generally in the circumferential direction around the longitudinal axis of the corresponding valve, and that the partition means consist of a generally cylindrical guiding sheet integral with the guiding baffles and which is inserted between the upper and lower walls of the annular duct.
  • the cylindrical guiding sheet in a simple way provides a coupling in parallel of the feeding ducts and the return ducts of the blind holes in such a way that all the blind holes cool the insert in the same way.
  • a further embodiment of the valve seat insert is according to the invention characterized in that annular ducts are formed along the separation surface between an upper part and a lower part which are welded together along the outer and inner surfaces of the insert, and in that the insert is clamped into the cylinder head of the engine in such a way that the clamping causes compressive stresses in the outer weld with the direction of the stresses extending generally parallel with the longitudinal axis of the corresponding valve.
  • the insert will not be considerably weakened due to the fact that the outer weld, as mentioned, is under compressive stresses and the inner weld will also due to the heating which it will receive during the operation of the engine be subjected to compressive stresses due to the heat expansions of the inner surface of the insert.
  • valve housing may, preferably, according to a further embodiment of the invention be provided with a number of cooling medium inlet ducts and cooling medium outlet ducts communicating with the cooling medium inlet and cooling medium outlet chambers in the annular duct via ducts provided in the upper part and evenly distributed along the circumference of the annular duct.
  • FIG. 1 is a cylinder head for a Diesel engine viz. that part of the cylinder head which surrounds one of the exhaust valves 2 of the engines. It will be understood that Figures 1 and 3 for the sake of clarity show only one half of the corresponding exhaust valve 2.
  • the exhaust valve 2 cooperates with a stationary valve seat 3 which is welded to the lower end of an insert which in general is provided with reference numeral 4.
  • the valve seat insert 4 is arranged in a bore in the cylinder head 1, and the wall of the bore is provided with reference numeral 5.
  • a shoulder 6 is arranged which serves as support surface for a shoulder 7 which extends around the circumference of the insert 4.
  • the insert 4 is clamped against the shoulder 6 by means of bolts (not shown) which connect the valve housing 8 of the corresponding valve 2 and the cylinder head 1 of the engine.
  • the insert 4 is in the form of a bottom element which is damped, in the way explained, between the valve housing 8 and the cylinder head 1.
  • the present invention equally well may be used in connection with a valve seat insert in the form of a valve basket.
  • the insert 4 is provided with an annular duct 10 which according to the embodiments shown is arranged at the separation surface 11 between an upper part 12 and a lower part 13 for the inserts concerned, and the parts 12 and 13 are mutually connected by means of an inner weld 14 and an outer weld 15.
  • a guiding baffle 19 is inserted in each of the blind holes 17 with the lower edge 20 of the baffle ending at a small distance from the bottom 18 of the corresponding blind hole in such a way that each blind hole 17 is divided into a feeding duct 21 and a return duct 22.
  • the guiding baffles 19 are so inserted that they extend generally in radial planes, i.e. in planes which contain the longitudinal axis of the corresponding valve.
  • each guiding baffle 19 is arranged in the annular duct 10 as it appears from Figure 2 so as to prevent direct passage of cooling medium past the corresponding blind hole and instead cause the cooling medium to follow a meander formed path as indicated by means of arrows 26 in Figure 2.
  • the guiding baffles 19 and the partitions 24 are manufactured integrally with each other and before the welding together of the upper part 12 and the lower part 13 the partition part has been inserted into the part of the annular duct 10 extending in the upper part 12 in such a way that the guiding baffles 19 simultaneously, during the putting together of the upper part and the lower part, will serve as guides for the upper and the lower parts.
  • the insert is clamped against the shoulder 6 in the cylinder head 1 by means of bolts (not shown) which secure the valve housing 8 with respect to the cylinder head, and the valve housing 8 presses on the insert by means of an annular protrusion 28 which engages the circumferentially extending shoulder 29 at the insert.
  • This circumferentially extending shoulder 29 extends, as seen in the axial direction of the valve, generally aligned with the outer weld 15 and, accordingly, the outer weld will, after the insert has been mounted, be subjected to compressive stresses which, generally, extend in the longitudinal direction of the valve.
  • the radially innermost part of the insert has a clearance, as shown at 30, with respect to the valve housing and, accordingly, the radially innermost part of the insert may expand in the longitudinal direction of the valve when the inner part is heated by the hot exhaust gases. Accordingly, it is avoided that the expansion in the longitudinal direction of the valve to which the radially innermost part will be subjected during heating, will be transmitted to the outermost part of the insert which, as previously explained, is clamped axially aligned with the weld 15 in such a way that the outer weld constantly will be subjected to compressive stresses.
  • the annular duct 10 is fed with cooling medium through a number of cooling medium inlet ducts 34 arranged in the valve housing 8 and communicating with ducts 36 arranged in the upper part 12 of the valve insert.
  • cooling medium inlet ducts 34 may be used which means that four cooling medium inlet chambers 37, Figure 2, which are positioned offset 90° with respect to each other in the circumferential direction of the annular duct 10, are fed with cooling medium.
  • cooling medium outlet ducts are arranged in the valve housing 8 and each of the cooling medium outlet ducts communicates with a cooling medium outlet duct (not shown) in the insert corresponding to the ducts 36 but arranged between the ducts 36. Accordingly, the cooling medium outlet ducts communicate with cooling medium outlet chambers (not shown in Figure 2) which are arranged halfway between the cooling medium inlet chambers 37.
  • a cooling medium inlet duct 36 is shown together with the corresponding cooling medium inlet chamber 37 which is defined between two adjacent partitions, and from the arrows 26 in Figure 2 it will be understood that the cooling medium which is supplied through such a duct and such a cooling medium inlet chamber 37 will be divided into two streams which flow away from each other from each cooling medium inlet chamber 37 in the annular duct 10, so that each of said streams flows to an adjacent cooling medium outlet chamber.
  • the outlet ducts open, as indicated by dotted lines 38 in Figure 1, into a cooling medium outlet duct 40 arranged in the valve housing 8.
  • the cylinder head 1 is cooled by means of a cooling medium circulated through a system of cooling ducts 42, 44, an annular cooling chamber 46 which surrounds the insert and ducts 48.
  • the cooling medium used for cooling the insert may appropriately be diverged from the cooling medium circulating through the cylinder head.
  • a recess 50 is provided in the abutment surface 29 opposite each of the ducts in the upper part 12 and sealing rings 52 are positioned in the recesses 50.
  • the recesses are mutually connected in the circumferential direction of the insert by means of a shallow groove having a depth which is smaller than the depth of the recesses, and the parts of the groove extending between the sealing rings 52 are connected with the outer surface of the insert by means of telltale ducts in such a way that it is possible by means of the telltale ducts to ascertain whether a leakage exists at any of the sealings 52, both as regards the cooling medium and as regards exhaust gas.
  • the guiding baffles 19 are inserted into the blind holes 17 so that the guiding baffles 19 extend in the circumferential direction, i.e. in direction around the longitudinal axis of the corresponding valve.
  • the partition means arranged in the annular duct 10 consists of a generally cylindrical guiding metal sheet 60 manufactured integrally with the guiding baffles 19 and extending between the upper and lower walls of the annular duct 10 so as to divide the annular duct 10 into two chambers viz. a cooling medium inlet chamber 61 and a cooling medium outlet chamber 62.
  • the cooling medium inlet chamber 61 communicates with cooling medium inlet ducts 34 in the valve housing 8 via cooling medium inlet ducts 36 in the insert and the cooling medium inlet ducts 36 open into the innermost part of the annular duct 10. From this part the cooling medium flows downwardly, below the lower edges 20 of the guiding baffles 19 and upwardly into the outermost part of the annular chamber 10, from which the cooling medium is conducted through cooling medium outlet ducts 64 indicated by means of broken lines in Figure 3 in the insert, and which are connected with the cooling medium outlet duct 30 in the valve housing 8 opening into an annular chamber 40 in the valve housing 8.
  • the cooling medium inlet ducts and the cooling medium outlet ducts are equally distributed in the circumferential direction in such a way that the cooling medium inlet chamber 61 is fed at positions which are offset with respect to the positions at which cooling medium is guided out from the cooling medium outlet chamber 62.
  • blind holes 17 are coupled in parallel in such a way that each blind hole is traversed by a corresponding partial stream of cooling medium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Details Of Valves (AREA)
  • Lift Valve (AREA)
EP19820902067 1981-07-09 1982-07-07 Cooled valve seat insert, preferably for exhaust valves for diesel engines Expired EP0085058B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK305181A DK147131C (da) 1981-07-09 1981-07-09 Koelet ventilsaedeindsats, navnlig til udstoedsventiler til dieselmotorer
DK3051/81 1981-07-09

Publications (2)

Publication Number Publication Date
EP0085058A1 EP0085058A1 (en) 1983-08-10
EP0085058B1 true EP0085058B1 (en) 1985-06-05

Family

ID=8118524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820902067 Expired EP0085058B1 (en) 1981-07-09 1982-07-07 Cooled valve seat insert, preferably for exhaust valves for diesel engines

Country Status (6)

Country Link
EP (1) EP0085058B1 (da)
JP (1) JPS58501085A (da)
DE (1) DE3264032D1 (da)
DK (1) DK147131C (da)
NO (1) NO152879B (da)
WO (1) WO1983000186A1 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159100B4 (de) * 2001-12-01 2004-09-16 Man B&W Diesel A/S Hubkolbenmaschine
DE102004027084A1 (de) * 2004-06-02 2005-12-29 Man B & W Diesel Ag Gekühlter Ventilsitzring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE332976C (de) * 1916-10-28 1921-02-16 Galloways Ltd Gekuehlter Ventilsitz fuer Verbrennungskraftmaschinen
DE2530736C3 (de) * 1975-07-10 1984-06-28 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Thermisch belastetes Bauteil einer Brennkraftmaschine mit einer heißen Wand
CH614014A5 (da) * 1977-01-28 1979-10-31 Sulzer Ag

Also Published As

Publication number Publication date
DK147131C (da) 1984-10-01
DK305181A (da) 1983-01-10
WO1983000186A1 (en) 1983-01-20
NO152879B (no) 1985-08-26
DE3264032D1 (en) 1985-07-11
JPS58501085A (ja) 1983-07-07
EP0085058A1 (en) 1983-08-10
DK147131B (da) 1984-04-16
NO830804L (no) 1983-03-08

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