EP0076348B1 - Chapelle de soupape d'échappement - Google Patents

Chapelle de soupape d'échappement Download PDF

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Publication number
EP0076348B1
EP0076348B1 EP19810304727 EP81304727A EP0076348B1 EP 0076348 B1 EP0076348 B1 EP 0076348B1 EP 19810304727 EP19810304727 EP 19810304727 EP 81304727 A EP81304727 A EP 81304727A EP 0076348 B1 EP0076348 B1 EP 0076348B1
Authority
EP
European Patent Office
Prior art keywords
valve
exhaust
casing
coolant
valve seat
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
EP19810304727
Other languages
German (de)
English (en)
Other versions
EP0076348A1 (fr
Inventor
Keijiro C/O Diesel Engine Engineering S. Tayama
Hiroaki C/O Diesel Engine Res. & Dev. Miyano
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to EP19810304727 priority Critical patent/EP0076348B1/fr
Priority to DE8181304727T priority patent/DE3171601D1/de
Publication of EP0076348A1 publication Critical patent/EP0076348A1/fr
Application granted granted Critical
Publication of EP0076348B1 publication Critical patent/EP0076348B1/fr
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
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • F01L3/085—Valve cages

Definitions

  • the present invention relates to exhaust valve casings for an internal combustion engine of the kind which provides an exhaust passage independently of the cylinder head.
  • FIG. 1 A known construction of exhaust valve and its valve casing is shown in Figure 1.
  • a valve seat 2 and a valve 3 by the intermediary of a valve spring 4 and a spring cap 5; it will be noted that the periphery of the valve seat 2 is formed independently of the cylinder head.
  • a valve guide bush 7 made of a material that is favourable for lubrication in order to obtain smooth sliding movement of the valve 3.
  • the valve casing 1 is fastened jointly with the valve seat 2 in a pressure-tight manner to a cylinder head 6 at a contact surface 2a between said valve seat 2 and cylinder head by means of bolts (not shown).
  • valve 3 may be opened and closed at predetermined timing by means of an exhaust valve driving apparatus (not shown) so that exhaust gas within the cylinder 8 can flow out, to be replaced by a fresh charge flowing in through a scavenging port (not shown), or the like.
  • coolant flows continuously through a coolant inlet 1 b provided in the valve casing 1 into cooling chambers 1c and 1d in said valve casing and, after it has cooled the valve casing and valve seat, it flows out through a coolant outlet 1e.
  • valve casing is formed as a casting, due to casting difficulties, the coolant chambers 1c and 1d cannot be made as small as desired. Consequently, the height of the valve casing 1 must be made greater than desired.
  • FIG. 1 Another construction of such an exhaust valve casing is known from CH-A-429 304 in which cooling chambers (14, 18) are provided around the valve guide (19) and around the valve seat.
  • the chambers are connected by a coolant duct (11) extending through the wall of the casing and, a further coolant duct (16) extends through the length of the casing wall to the valve seat chamber (14).
  • a wall (10) of the valve casing defining the valve guide cooling chamber (18) extends downwardly around the valve into the exhaust gas passageway so that, in use, the effect of coolant flowing through that chamber is to cool the gas exhaust passageway as well as the valve guide.
  • One object of the present invention is to provide an exhaust valve casing of the kind discussed above, in which thermal loss in the exhaust gas is reduced, whilst ensuring adequate cooling of the valve guide, and valve seat.
  • Another object of the present invention is to provide such an exhaust valve casing, in which the height of the casing, and thus a length of the exhaust valve stem, can be reduced, with resultant saving in weight and manufacturing costs.
  • an exhaust valve casing for an internal combustion engine of the kind which is intended to be fastened to the cylinder head to provide a valve seat and exhaust gas passage and to support the exhaust valve and a valve guide therefor independently of the cylinder head, and in which said casing is provided with annular cooling chambers at two locations, one disposed around the periphery of said valve guide, and the other disposed around said valve seat, characterised in that the two cooling chambers and ducts through said valve casing for supplying coolant to and from said chambers are arranged with respect to, and spaced sufficiently away from, the exhaust gas passage such that, in use, coolant flowing therethrough cools respectively the valve guide and valve seat without substantially any cooling effect on said exhaust passage.
  • the valve casing may include respective independent coolant inlet and outlet ducts through the wall of said casing to the two chambers, and in that said coolant inlet and outlet ducts of the valve seat are in the proximity of said valve seat. It will be appreciated that the independent coolant ducts to the two chambers can, nevertheless, be connected externally of the casing to a common source of coolant.
  • the exhaust valve casing according to the present invention lacks a cooling chamber in the vicinity of the exhaust passage, the height of the valve casing, as well as the length of the valve stem can be reduced, with a consequent saving in weight and manufacturing costs. Also, such a reduced height and configuration of the exhaust valve can be advantageous for space utilisation in an engine room.
  • the casing wall around the gas exhaust passage may be lagged externally to further reduce thermal losses in the exhaust gas.
  • the exhaust valve casing 11 is provided at its inner end with a wall part defining a valve seat 12 and a valve 13 is supported in the casing by the intermediary of a valve spring 14 and a spring cap 15.
  • the exhaust valve thus provides an exhaust gas passage and valve assembly which is independent of the cylinder head 16.
  • the stem of the valve 13 is slidably mounted in a valve guide bush 17.
  • the valve casing 11 is fastened jointly with the valve seat 12 to the cylinder head 16 in a pressure-tight manner by means of bolts 19 (see Figure 3).
  • reference numeral 20 designates ribs provided for enabling transmission of a uniform stress in a circumferential direction through a contact surface 12a (see Figure 2) between the valve seat and cylinder head.
  • An annular cooling chamber 11c is formed along an outer periphery of the valve guide bush 17, and coolant is introduced thereto through a coolant inlet duct 11b and discharged through a coolant outlet duct 11d.
  • seals 21 are provided in the valve guide bush 17.
  • a second annular cooling chamber 12b is formed within the wall part defining the valve seat 12, and coolant is introduced to this chamber through a coolant inlet duct 11 and discharged through a coolant outlet duct (not shown).
  • cooling of a peripheral wall 11f around the exhaust passage 11 a by means of coolant is practiced in the known construction discussed above, is abolished. Furthermore the cooling arrangement is constructed in such a manner that only the two locations described above are cooled by the coolant.
  • the outer periphery of the valve guide bush 17 is positively cooled by means of the coolant.
  • the valve seat 12 is positively cooled by coolant.
  • the peripheral wall 11f around the exhaust passage 11 of the exhaust valve casing 11 is lagged externally by a heat-insulating materia) 11g (see Figure 3) such as, for example, asbestos.
  • coolant is introduced through the coolant inlet duct 11 for valve seat cooling as shown by arrow B, and flows into the cooling chamber 12b, and thereafter, around the cooling chamber, to be discharged externally through the coolant outlet duct. Coolant is also introduced through the coolant inlet duct 11 b for the valve guide bush 17 as shown by an arrow A, to flow into the cooling chamber 11c along the outer periphery of the bush 17 and to be discharged externally through the coolant outlet duct 11d.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (3)

1. Chapelle de soupape d'échappement d'un moteur à combustion interne, agencée pour être fixée à la culasse des cylindres pour constituer un siège de soupape (12) et un passage (11a) des gaz d'échappement, et pour supporter la soupape d'échappement (13) et un guide de soupape (17) indépendamment de la culasse, et comportant des chambres annulaires de refroidissement qui sont situées en deux emplacements diffèrents, l'une (11 c) de ces chambres étant située autour de la périphérie du guide de soupape et l'autre (12b) étant située autour du siège de soupape, caractérisée en ce que les deux chambres de refroidissement (11c et 12b) et les conduits qui leur sont raccordés pour la circulation d'un fluide de refroidissement sont disposés de telle manière par rapport au passage (11a) des gaz d'échappement, et à une telle distance de ce passage, que le fluide de réfroidissement circulant dans ces chambres et ces conduits pendant le fonctionnement du moteur refroidit respectivement le guide de soupape (17) et le siège de soupape (12) sans refroidir substantiellement ledit passage des gaz d'échappement (11a).
2. Chapelle de soupape d'échappement selon la revendication 1, caractérisée en ce que chacune des chambres est pourvue de conduits individuels d'entrée et de sortie (11b, 11d, 11e, -) du fluide de refroidissement, traversant les parois de la chapelle, et en ce que les conduits d'entrée et de sortie pour le refroidissement du siège de soupape se trouvent à proximité de ce siège.
3. Chapelle de soupape d'échappement selon la revendication 1 ou 2, caractérisée en ce que la paroi (11f) de la chapelle entourant le passage (11a) des gaz d'échappement est revêtue extérieurement d'une matière thermiquement isolante (11g).
EP19810304727 1981-10-12 1981-10-12 Chapelle de soupape d'échappement Expired EP0076348B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19810304727 EP0076348B1 (fr) 1981-10-12 1981-10-12 Chapelle de soupape d'échappement
DE8181304727T DE3171601D1 (en) 1981-10-12 1981-10-12 Exhaust valve casing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810304727 EP0076348B1 (fr) 1981-10-12 1981-10-12 Chapelle de soupape d'échappement

Publications (2)

Publication Number Publication Date
EP0076348A1 EP0076348A1 (fr) 1983-04-13
EP0076348B1 true EP0076348B1 (fr) 1985-07-31

Family

ID=8188433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810304727 Expired EP0076348B1 (fr) 1981-10-12 1981-10-12 Chapelle de soupape d'échappement

Country Status (2)

Country Link
EP (1) EP0076348B1 (fr)
DE (1) DE3171601D1 (fr)

Cited By (1)

* 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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1074516C (zh) * 1999-02-13 2001-11-07 董永钏 球阀
DE19943264C2 (de) * 1999-09-10 2002-07-25 Man B & W Diesel As Kopenhagen Hubkolbenmaschine, insbesondere Zweitakt-Großdieselmotor
CN104847521A (zh) * 2015-05-13 2015-08-19 柳州金盾机械有限公司 一种装载机汽缸盖结构

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1068041A (en) * 1963-01-05 1967-05-10 Mirrlees Nat Ltd Improvements in or relating to caged valves for internal combustion engines
GB1100403A (en) * 1965-03-17 1968-01-24 Mirrlees Nat Ltd Improvements in or relating to caged poppet valves for internal combustion engines
FR2259232B1 (fr) * 1974-01-29 1976-06-25 Semt
DD110682A1 (fr) * 1974-02-14 1975-01-05
DE2410893C2 (de) * 1974-03-07 1982-09-16 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Ventilkorb für Brennkraftmaschinen
DE2441689A1 (de) * 1974-08-30 1976-03-11 Maschf Augsburg Nuernberg Ag Vorrichtung zur kuehlung von ventilen, insbesondere von auslassventilen fuer brennkraftmaschinen
GB1546661A (en) * 1975-04-22 1979-05-31 Honda Motor Co Ltd Internal combustion engines
CH614014A5 (fr) * 1977-01-28 1979-10-31 Sulzer Ag
DE2737689A1 (de) * 1977-08-20 1979-02-22 Maschf Augsburg Nuernberg Ag Ventilanordnung

Cited By (1)

* 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

Also Published As

Publication number Publication date
DE3171601D1 (en) 1985-09-05
EP0076348A1 (fr) 1983-04-13

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