EP0155261A2 - Distribution à soupape pour moteur à combustion interne - Google Patents

Distribution à soupape pour moteur à combustion interne Download PDF

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Publication number
EP0155261A2
EP0155261A2 EP85890059A EP85890059A EP0155261A2 EP 0155261 A2 EP0155261 A2 EP 0155261A2 EP 85890059 A EP85890059 A EP 85890059A EP 85890059 A EP85890059 A EP 85890059A EP 0155261 A2 EP0155261 A2 EP 0155261A2
Authority
EP
European Patent Office
Prior art keywords
valve control
valve
valves
cams
control according
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
EP85890059A
Other languages
German (de)
English (en)
Other versions
EP0155261B1 (fr
EP0155261A3 (en
EP0155261B2 (fr
Inventor
Hermann Weichsler
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.)
Weichsler Hermann
Original Assignee
Bombardier Rotax GmbH and Co Kg
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3501045&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0155261(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bombardier Rotax GmbH and Co Kg filed Critical Bombardier Rotax GmbH and Co Kg
Publication of EP0155261A2 publication Critical patent/EP0155261A2/fr
Publication of EP0155261A3 publication Critical patent/EP0155261A3/de
Publication of EP0155261B1 publication Critical patent/EP0155261B1/fr
Application granted granted Critical
Publication of EP0155261B2 publication Critical patent/EP0155261B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/262—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with valve stems disposed radially from a centre which is substantially the centre of curvature of the upper wall surface of a combustion chamber
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/205—Adjusting or compensating clearance by means of shims or the like
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0042—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams being profiled in axial and radial direction
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • 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
    • F01L2003/25—Valve configurations in relation to engine
    • F01L2003/256—Valve configurations in relation to engine configured other than perpendicular to camshaft axis
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • F02F2001/246—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis and orientated radially from the combustion chamber surface

Definitions

  • the invention relates to a valve control for an internal combustion engine with at least one cylinder, the cylinder head of which has at least one pair of valves arranged at an angle to one another and radially oriented with respect to the combustion chamber, which valves can be actuated by a common camshaft by means of conical cams.
  • a particularly advantageous gas exchange is achieved with favorable utilization of the combustion chamber in that two intake and two exhaust valves are provided per cylinder and that the valves with the same function are diametrically opposed to one another with respect to the cylinder axis. Due to the radial alignment of the valves, camshafts below are particularly suitable for valve actuation, from which the valve lift is derived via bumpers and rocker arms. With such a valve arrangement, the transmission of the lifting movement of conventional control cams of overhead camshafts to the valves is only possible via complex drag and angle levers.
  • the invention is therefore based on the object to avoid these deficiencies and to improve a valve control of the type described in such a way that its advantages can also be used for high-speed internal combustion engines without having to accept the disadvantages occurring in the prior art.
  • cup tappets which are mounted displaceably in the cylinder head are provided between the radially oriented valves and the conical cams.
  • the additional mass to be moved via the cam drive can initially be kept comparatively small, so that the achievable engine speed is not restricted in this regard.
  • the bucket tappet arranged coaxially to the valve stem can be guided in a bore of the cylinder head which receives the valve spring, so that the transverse forces transmitted from the conical cams to the bucket tappet can be transferred to the cylinder head in a simple manner without valve loading. Because of the comparatively large diameter of the guide bore for the bucket tappet, the additional load on the tappet guide due to the transverse forces occurring remains within permissible limits, the space required for guiding the bucket tappet being advantageously met by the space available with a radial valve arrangement.
  • the possible guide length for the bucket tappets ensures that they are removed during a cam stroke tipping moments on the tappet. These tilting moments can, however, be avoided if, in the rotational position for the maximum stroke, the conical cams in the raised area are pre-curved from an axis-normal plane against the associated bucket tappet, so that the bucket tappet is not eccentrically overrun even with a full cam stroke. With a corresponding adjustment to the respective geometric conditions, the cam curvature can easily achieve that the bucket tappet is always loaded in the center, which allows the bucket tappets to be supported without tilting moment even with comparatively large angles of inclination between the individual valves.
  • any desired valve clearance can be set in a simple manner because the distance of the control surface of the cams from the cup tappet changes when the conical cams are axially displaced. There is therefore no need to adjust the valve clearance, for example by means of washers between the tappet and the valve stem.
  • One possibility of arranging the cams in an axially adjustable manner is to mount the cams on the camshaft in an axially adjustable manner, the respective axial position of the cams being able to be secured, for example, by shaft nuts.
  • Another possibility of adjusting the valve clearance can be obtained in that the camshaft is divided and that the partial shafts each having a cam are axially adjustable per se. In this case, the partial shafts of the camshaft must be held axially in order to fix the set valve clearance, which can be achieved in different ways.
  • each adjustable partial waves he also allows an independent readjustment of the valve clearance when the partial shafts of the camshaft are hydraulically adjustable. Particularly simple constructional relationships can be ensured in this way that the partial shafts are acted upon hydraulically via a non-return valve in each case in order to reduce the valve clearance, because with the closing of the non-return valve following an adjustment, the axial position of the respective partial shaft is retained.
  • the internal combustion engine shown consists essentially of a cylinder 1, the cylinder head 2 of which has two intake valves 3 and two exhaust valves 4, the arrangement being such that the valves with the same function are diametrically opposed with respect to the cylinder axis lie.
  • the valves 3, 4 are aligned radially with respect to the combustion chamber, which is closed off by a spherical cap, so that the axes of the valve stems 5 intersect at the center of the ball defining the spherical cap.
  • These valves 3 and 4 are assigned in pairs to a camshaft 6 which carries conical cams 7.
  • the cam stroke is transmitted to the valve stems 5 via a tappet 8, which is cup-shaped and coaxially encloses the valve springs 9 and the valve plate 10.
  • This tappet is slidably guided in a bore 11 of the cylinder head 2 coaxially to the valve stems 5, so that the transverse forces transmitted from the conical cams 7 to the tappet 8 can be transferred via the wall of the bore 11 to the cylinder head. Since the tappet 8 lies loosely on the valve stem 5, only a power transmission in the direction of the axis of the valve stem 5 is possible, but not transversely to it.
  • the conical cams 7 are pre-curved in the rotational position for the maximum stroke in the elevation area from a plane normal to the axis against the associated tappet 8, so that the tappet 8 is not off-center from the cam during the stroke can be overrun.
  • the load on the bucket tappet therefore remains central in every stroke position.
  • the camshaft 6 is divided into two part shafts 6a and 6b, each part being axially displaceably mounted in the cylinder head. These two partial shafts 6a and 6b are connected to one another in a rotationally fixed but axially displaceable manner via an axially fixed coupling piece 12, namely a multi-groove connection exists between the partial shafts 6a, 6b and the coupling piece 12.
  • the desired valve clearance is set by an axial adjustment of the partial shafts 6a, 6b, with washers 13 of corresponding thickness in order to fix the position
  • the form of half rings between the coupling piece 12 and shaft collars 14 are inserted before the partial shafts are axially clamped together with the coupling piece 12 via a draw bolt 15.
  • FIG. 4 even allows an independent valve lash adjustment in that the partial shafts 6a, 6b of the camshaft 6 are acted upon hydraulically.
  • the partial shafts 6a, 6b are connected to pressure cylinders 16, which can be supplied with pressure oil from the lubrication system of the engine via channels 17 provided in the coupling piece 12 and check valves 19 inserted into axial through bores 18 of the partial shafts. If a cam 7 moves in the area of its base circle over the bucket tappet 8, any play between the cam and the bucket tappet is compensated for, because the pressure oil flows through the check valve 19 to the pressure cylinder 16 and can axially adjust the partial shaft in the sense of a play reduction.
  • a flow channel 20 for a cooling medium can be kept free between the two camshafts 6 and the valves 3 and 4 assigned to these camshafts, which also creates favorable cooling conditions in the area of the central spark plug 21, especially in air-cooled engines .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP85890059A 1984-03-14 1985-03-12 Distribution à soupape pour moteur à combustion interne Expired - Lifetime EP0155261B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0084384A AT382933B (de) 1984-03-14 1984-03-14 Ventilbetaetigung fuer hubkolben - brennkraftmaschinen
AT843/84 1984-03-14

Publications (4)

Publication Number Publication Date
EP0155261A2 true EP0155261A2 (fr) 1985-09-18
EP0155261A3 EP0155261A3 (en) 1987-01-07
EP0155261B1 EP0155261B1 (fr) 1989-06-14
EP0155261B2 EP0155261B2 (fr) 1996-03-20

Family

ID=3501045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890059A Expired - Lifetime EP0155261B2 (fr) 1984-03-14 1985-03-12 Distribution à soupape pour moteur à combustion interne

Country Status (4)

Country Link
US (1) US4635592A (fr)
EP (1) EP0155261B2 (fr)
AT (2) AT382933B (fr)
DE (1) DE3571061D1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197914A1 (fr) * 1985-03-18 1986-10-15 Hermann Weichsler Commande de soupapes pour moteur à combustion interne
EP0235121A1 (fr) * 1986-02-20 1987-09-02 Hermann Weichsler Moteur à combustion interne
DE3818636A1 (de) * 1988-06-01 1989-12-07 Bayerische Motoren Werke Ag Hubkolben-brennkraftmaschine mit einem zwei obenliegende steuerwellen umfassenden zylinderkopf
DE3838305A1 (de) * 1988-11-11 1990-05-17 Audi Ag Zylinderkopf einer brennkraftmaschine
FR2668797A1 (fr) * 1990-11-05 1992-05-07 Silvetti Gabriel Culasse pour moteurs thermiques avec soupapes a levee variable.
AT400971B (de) * 1985-10-17 1996-05-28 Bombardier Rotax Gmbh Ventilsteuerung für einen zylinder einer brennkraftmaschine
WO1999005404A1 (fr) 1997-07-24 1999-02-04 Peter Pelz Moteur a combustion interne a piston alternatif
WO2009056237A1 (fr) * 2007-11-02 2009-05-07 Daimler Ag Mécanisme de distribution

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5016592A (en) * 1989-02-14 1991-05-21 Yamaha Hatsudoki Kabushika Kaisha Cylinder head and valve train arrangement for multiple valve engine
US4982705A (en) * 1990-02-21 1991-01-08 Tecumseh Products Company Cam pulley and cylinder head arrangement for an overhead cam engine
EP0867601B1 (fr) * 1997-03-27 2003-01-22 Toyota Jidosha Kabushiki Kaisha Dispositif de commande de soupape pour moteur à combustion interne
JP3493296B2 (ja) * 1997-11-25 2004-02-03 茂 長野 エンジン
EP0967367B1 (fr) * 1998-06-24 2003-12-03 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de commande de soupapes pour moteur à combustion interne
US6170449B1 (en) * 1998-09-30 2001-01-09 Yamaha Hatsudoki Kabushiki Kaisha Valve operating system for engine
JP4627121B2 (ja) * 2001-06-12 2011-02-09 ヤマハ発動機株式会社 三次元カムおよび三次元カム用研削装置
JP4201617B2 (ja) * 2003-02-24 2008-12-24 本田技研工業株式会社 内燃機関
DE102007032638A1 (de) * 2007-07-11 2009-01-15 Bayerische Motoren Werke Aktiengesellschaft Brennkraftmaschine mit einer Kurbelwelle und wenigstens einem Zylinderkopf sowie Kraftfahrzeug mit einer derartigen Brennkraftmaschine
CN103277209B (zh) * 2013-06-08 2015-08-19 清华大学 单缸机交叉气道缸盖总成结构

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR327184A (fr) * 1902-12-09 1903-06-16 Filtz Joseph Mécanisme de commande des soupapes d'un moteur à explosion
GB226442A (en) * 1924-06-12 1924-12-24 Montague Stanley Napier Improvements in or relating to internal combustion engines
GB242919A (en) * 1925-07-10 1925-11-19 Napier & Son Ltd Improvements in or relating to valve operating mechanism for internal combustion engines
GB375459A (en) * 1931-04-07 1932-06-30 Frank Albert George Butters Improvements in or relating to the valve mechanism of internal combustion engines
GB467320A (en) * 1935-12-20 1937-06-15 Ludwig Apfelbeck Improvements in cylinder-heads for internal combustion engines
GB558779A (en) * 1943-05-19 1944-01-20 Harold Raymond Morgan Improvements in combustion chambers and overhead valve gear in internal combustion engines
DE953672C (de) * 1952-05-07 1956-12-06 Daimler Benz Ag Ventilsteuerung fuer Brennkraftmaschinen
US3481314A (en) * 1967-08-29 1969-12-02 Georges G Lecrenn Means for optimizing the performance of internal combustion engines
US3638624A (en) * 1970-04-13 1972-02-01 Donald J O Grady Engine valve control means
US3730150A (en) * 1971-10-20 1973-05-01 S Codner Method and apparatus for control of valve operation
DE2300827A1 (de) * 1973-01-09 1974-07-11 Keller Edmund Ventilbetaetigungssystem einer hubkolbenbrennkraftmaschine
GB1505643A (en) * 1975-05-20 1978-03-30 British Leyland Uk Ltd Internal combustion engine
JPS5261618A (en) * 1975-11-17 1977-05-21 Nissan Motor Co Ltd Open and close time control mechanism for inlet or exhaust valve of in ternal combustion engine
JPS538415A (en) * 1976-07-13 1978-01-25 Toyota Motor Corp Hydraulic valve lifter assembly for overhead cam-type engine
JPS5596310A (en) * 1979-01-12 1980-07-22 Nissan Motor Co Ltd Valve rocking device
JPS5838603B2 (ja) * 1979-07-03 1983-08-24 日産自動車株式会社 内燃機関のバルブリフト装置
JPS57210126A (en) * 1981-06-19 1982-12-23 Yamaha Motor Co Ltd High pressure gas fuel engine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197914A1 (fr) * 1985-03-18 1986-10-15 Hermann Weichsler Commande de soupapes pour moteur à combustion interne
AT400971B (de) * 1985-10-17 1996-05-28 Bombardier Rotax Gmbh Ventilsteuerung für einen zylinder einer brennkraftmaschine
EP0235121A1 (fr) * 1986-02-20 1987-09-02 Hermann Weichsler Moteur à combustion interne
DE3818636A1 (de) * 1988-06-01 1989-12-07 Bayerische Motoren Werke Ag Hubkolben-brennkraftmaschine mit einem zwei obenliegende steuerwellen umfassenden zylinderkopf
DE3838305A1 (de) * 1988-11-11 1990-05-17 Audi Ag Zylinderkopf einer brennkraftmaschine
FR2668797A1 (fr) * 1990-11-05 1992-05-07 Silvetti Gabriel Culasse pour moteurs thermiques avec soupapes a levee variable.
WO1999005404A1 (fr) 1997-07-24 1999-02-04 Peter Pelz Moteur a combustion interne a piston alternatif
WO2009056237A1 (fr) * 2007-11-02 2009-05-07 Daimler Ag Mécanisme de distribution

Also Published As

Publication number Publication date
EP0155261B1 (fr) 1989-06-14
ATE44074T1 (de) 1989-06-15
US4635592A (en) 1987-01-13
EP0155261A3 (en) 1987-01-07
AT382933B (de) 1987-04-27
ATA84384A (de) 1986-09-15
EP0155261B2 (fr) 1996-03-20
DE3571061D1 (en) 1989-07-20

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