EP0076348A1 - Chapelle de soupape d'échappement - Google Patents

Chapelle de soupape d'échappement Download PDF

Info

Publication number
EP0076348A1
EP0076348A1 EP19810304727 EP81304727A EP0076348A1 EP 0076348 A1 EP0076348 A1 EP 0076348A1 EP 19810304727 EP19810304727 EP 19810304727 EP 81304727 A EP81304727 A EP 81304727A EP 0076348 A1 EP0076348 A1 EP 0076348A1
Authority
EP
European Patent Office
Prior art keywords
valve
exhaust
casing
valve seat
around
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.)
Granted
Application number
EP19810304727
Other languages
German (de)
English (en)
Other versions
EP0076348B1 (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 lb provided in the valve casing 1 into cooling chambers lc and ld in said valve casing and, after it has cooled the valve casing and valve seat, it flows out through a coolant outlet le.
  • valve casing is formed as a casting, due to casting difficulties, the coolant chambers lc and ld cannot be made as small as desired. Consequently, the height of the valve casing 1 must be made greater than desired.
  • 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, characterised in that said casing is provided with cooling chambers only at two locations that is, within a peripheral wall around the valve guide, and within a peripheral wall around the valve seat.
  • no cooling chamber or path is located adjacent the exhaust gas passage, thereby significantly reducing, if not eliminating thermal losses in the exhaust gas flowing througn the casing.
  • valve guide is in the form of a bush
  • the cooling chamber around the valve guide may be of annular shape and extend along the outer periphery of said bush; also the cooling chamber around the valve seat may be of annular shape and be provided within the wall defining the valve seat, coolent inlet and outlet ducts being provided within the wall of the exhaust valve casing in the proximity of said valve seat.
  • 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 configuration of the exhaust valve can be advantageous for space utilisation in an engine room.
  • 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 llc is formed along an outer periphery of the valve guide bush 17, and coolant is introduced thereto through a coolant inlet duct llb and discharged through a coolant outlet duct lld.
  • 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 lle and discharged through a coolant outlet duct (not shown).
  • 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 llf around the exhaust passage lla of the exhaust valve casing 11 is lagged externally by a heat-insulating material llg (see Figure 3) such as, for example, asbestos.
  • coolant is introduced through the coolant inlet duct lle 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 llb for the valve guide bush 17 as shown by an arrow A, to flow into the cooling chamber llc along the outer periphery of the bush 17 and to be discharged externally through the coolant outlet duct lld.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
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 true EP0076348A1 (fr) 1983-04-13
EP0076348B1 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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001020154A1 (fr) * 1999-09-10 2001-03-22 Man B & W Diesel A/S Machine, de preference machine a piston alternatif
CN1074516C (zh) * 1999-02-13 2001-11-07 董永钏 球阀
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

Families Citing this family (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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH429304A (de) * 1963-01-05 1967-01-31 Mirrlees National Limited Käfigventil für Verbrennungskraftmaschine
DE1526593A1 (de) * 1965-03-17 1970-02-12 Mirrlees Nat Ltd Mit einem Gehaeuse versehenes Ventil fuer Brennkraftmaschinen
DD110682A1 (fr) * 1974-02-14 1975-01-05
DE2441689A1 (de) * 1974-08-30 1976-03-11 Maschf Augsburg Nuernberg Ag Vorrichtung zur kuehlung von ventilen, insbesondere von auslassventilen fuer brennkraftmaschinen
FR2308787A1 (fr) * 1975-04-22 1976-11-19 Honda Motor Co Ltd Perfectionnements aux moteurs a combustion interne
US4000730A (en) * 1974-03-07 1977-01-04 Maschinenfabrik Augsburg-Nurnberg Ag Valve cage structure for internal combustion engines, particularly adapted for fluid cooling
US4008695A (en) * 1974-01-29 1977-02-22 Societe D'etudes De Machines Thermiques Cooled integral valve chest for an internal combustion engine and method for making same
FR2378945A1 (fr) * 1977-01-28 1978-08-25 Sulzer Ag Moteur a combustion interne
DE2737689A1 (de) * 1977-08-20 1979-02-22 Maschf Augsburg Nuernberg Ag Ventilanordnung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH429304A (de) * 1963-01-05 1967-01-31 Mirrlees National Limited Käfigventil für Verbrennungskraftmaschine
DE1526593A1 (de) * 1965-03-17 1970-02-12 Mirrlees Nat Ltd Mit einem Gehaeuse versehenes Ventil fuer Brennkraftmaschinen
US4008695A (en) * 1974-01-29 1977-02-22 Societe D'etudes De Machines Thermiques Cooled integral valve chest for an internal combustion engine and method for making same
DD110682A1 (fr) * 1974-02-14 1975-01-05
US4000730A (en) * 1974-03-07 1977-01-04 Maschinenfabrik Augsburg-Nurnberg Ag Valve cage structure for internal combustion engines, particularly adapted for fluid cooling
DE2441689A1 (de) * 1974-08-30 1976-03-11 Maschf Augsburg Nuernberg Ag Vorrichtung zur kuehlung von ventilen, insbesondere von auslassventilen fuer brennkraftmaschinen
FR2308787A1 (fr) * 1975-04-22 1976-11-19 Honda Motor Co Ltd Perfectionnements aux moteurs a combustion interne
FR2378945A1 (fr) * 1977-01-28 1978-08-25 Sulzer Ag Moteur a combustion interne
DE2737689A1 (de) * 1977-08-20 1979-02-22 Maschf Augsburg Nuernberg Ag Ventilanordnung

Cited By (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
WO2001020154A1 (fr) * 1999-09-10 2001-03-22 Man B & W Diesel A/S Machine, de preference machine a piston alternatif
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

Also Published As

Publication number Publication date
DE3171601D1 (en) 1985-09-05
EP0076348B1 (fr) 1985-07-31

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