EP1119689B2 - Valve train assembly - Google Patents
Valve train assembly Download PDFInfo
- Publication number
- EP1119689B2 EP1119689B2 EP99970148A EP99970148A EP1119689B2 EP 1119689 B2 EP1119689 B2 EP 1119689B2 EP 99970148 A EP99970148 A EP 99970148A EP 99970148 A EP99970148 A EP 99970148A EP 1119689 B2 EP1119689 B2 EP 1119689B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker arm
- assembly
- fulcrum
- rocker
- carrier
- 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 - Lifetime
Links
Images
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
- F01L1/20—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
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
-
- 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
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L2001/188—Fulcrums at upper surface
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the present invention relates to a valve train assembly for an internal combustion engine, and to rocker arms for such an assembly.
- the invention is particularly but not exclusively related to arrangements in which the number of parts in the assembly is reduced, in which various parts can be pre-assembled to facilitate engine assembly, and in which various pans are made more simply.
- JP58-88412 describes a valve train assembly comprising: a valve train carrier having a plurality of individual rocker arm fulcra each of which forms part of a hydraulic lash adjuster; and a plurality of rocker arms, each rocker arm being attached to a respective fulcrum to form a self-supporting assembly and being pivotable about the fulcrum; wherein the assembly has been manufactured and then pre-assembled separately from, but is operatively attachable to, an internal combustion engine having a camshaft such that the rocker arms are movable by cams of the camshaft in order to operate valves of the engine, wherein each rocker arm has a part-spherical surface for mating with a corresponding surface of the fulcrum to which it is attached.
- valve train assembly of claim 1 According to the invention there is provided the valve train assembly of claim 1.
- a valve train assembly for a internal combustion engine comprises a valve train carrier having a plurality of individual rocker arm fulcra, and a rocker arm attached to each fulcrum.
- the carrier may also have one or more camshafts mounted thereto.
- Such an arrangement can be provided as a pre-assembled unit for fitting to a cylinder head having valves mounted therein. thus substantially facilitating the assembly of an engine.
- Each fulcrum may form part of a hydraulic lash adjuster. Accordingly, since the lash adjusters would be fixedly mounted to the carrier, they are more easily supplied with oil, so that a smaller oil pump producing relatively low pressure can be used.
- each rocker arm and its associated fulcrum have co-operating part-spherical surfaces which permit not only the pivoting motion required for operating the valves, but also a degree of rotation about the length of the rocker arm, to provide a self-adjusting function.
- the rocker arm has a part-spherical recess into which a part-spherical projection is located.
- the profile of the recess may comprise several, e.g. three, spherical segments of slightly different diameter tangential to each other, sometimes referred to as a gothic socket.
- the rocker arm may be attached to the projection by means of a clip, possibly made of spring steel. which is fitted over the head of the projection.
- rocker arms do not need to be fitted to rocker axles, they may be made smaller and lighter compared to existing aluminium or steel rockers.
- the rockers are made of pressed sheet metal (with the final thickness possibly increased or decreased by the pressing operation to provide suitable weight/strength properties), and their lightness enables the use of lighter valve springs resulting in lower energy consumption.
- rockers of equal length for all the valves. Accordingly, the rockers can be substantially identical, thereby reducing manufacturing costs.
- Fig. 1 shows a prior art rocker (B') made of pressed aluminium, and comprising a lever of the first order mounted on a fixed axle (70), which also carries other rockers arranged in a row.
- One end of the rocker (B') is in contact with a cam (C) by means of a roller (R'), while the other end has a reciprocating and pivoting hydraulic lash adjuster, referred to also as a tappet (80).
- the tappet has a spigot or projection (81) at the base acting on the head of a valve (V).
- a double row of camshafts (A') acts on convex surfaces of rollers (R').
- Fig. 2 shows an example of a rocker arm arrangement according to the present invention.
- the rocker (B) of the present invention is again a lever of the first order, i.e. it is a centre-pivoted rocker arm.
- the rocker (B) is mounted on a tappet (4) placed between a first end of the rocker (B), which is fitted with a roller (R) displaced and pushed against a cam (C) on the camshaft, and a second end, which transmits the pressure to open the poppet valve (V) against the resilient force of a spring (M).
- the rocker (B) shown in Figs. 3 to 6 is made up of two lateral flanges (12) and (12'), linked by an upper plate (13), with which it forms a U-shaped section, and is formed by bending or stamping a sheet of steel.
- a hemispherical recess (14) is formed in the plate (13), suitable for mating with the hemispherical head (41) of a spigot or projection (42) which is part of a lash adjuster or tappet (4).
- the tappet (4) is fitted in its own fixed seat (45, Fig. 7 ) formed by boring an aluminium cover (L) of the engine head.
- the cover (L) constitutes a valve train carrier, and is discussed further below.
- this spigot forms a fulcrum about which the rocker arm (B) can reciprocate in order to operate the valve (V), and around which the rocker arm may be laterally turned. It will be noted in particular that the rocker arm can rotate about an axis X ( Fig. 4 ) and about the axis of the spigot (42), to provide a degree of self-adjustment for the purposes set out below.
- Rocker (B) comprises at one end a transverse opening (15) into which a pivoting trunnion (16) is fitted, the trunnion (16) having opposing recesses (17), one of which presses onto the head of the stem of the valve (V), adjusting itself in accordance with the relative movement of the rocker arm (B) of the valve shaft, which may vary depending on the type of engine.
- roller (R) having needle bearings and located on an axle (20) extending through openings (22) provided in flanges (12) and (12').
- Roller (R) is very simple, with a straight cylindrical outside surface which closely fits the outside surface of cam (C) since as described above the rocker, with its fulcrum on the hemispherical recess (14), automatically compensates for any imperfection in transverse movement, thus making a convex outside surface, as required in customary design, unnecessary.
- a resilient sheet (25) is used with flanges (26) folded back on themselves so that the lower section can be attached to the rocker flanges (see Fig. 5 ).
- the resilient sheet has an inlet (27) at the top for the purpose of lubricating the trunnion (16).
- the sheet (30) may be made of spring steel, and has an aperture which allows the rocker arm (B) to be easily snap-fitted over the head (41) of the spigot (42) and thus attached to the cover (L). The sheet (30) thus retains the rocker arm (B) on the cover (L) without inhibiting any intended operational movement of the rocker arm.
- the projection or spigot (42) has a relatively narrow neck leading to the enlarged, part-spherical head (41), so that the aperture in the sheet (30), which has a diameter slightly larger than that of the neck, can be used to hold the rocker arm in place.
- the aperture is elongate, with its longitudinal axis extended substantially parallel to the length of the rocker arm, so as to facilitate fitting the rocker arm to the tappet (4), and to permit a degree of freedom of movement in the longitudinal direction to ensure proper engagement with the cam shaft and valve.
- alternative arrangements are possible.
- the rocker arm could be fastened to the head (41) by means of a rivet or other member extending through the rocker arm into a recess at the end of the head (41), possibly engaging therein by means of a screw thread or by a resilient enlarged portion which engages in an annular ridge within the recess.
- the means attaching the rocker arm to the fulcrum be fairly loose, and arranged so as not to inhibit the intended operational movement of the rocker arm.
- Fig. 7 is a detailed view of the tappet (4), which keeps rocker (B) pressed against one end of the valve head (V) by means of the pivoting trunnion (16), and at the other end against the cam (C) by means of roller (R).
- Within the lower part of the chamber (43) is a high pressure tappet chamber (47), whilst above is a plunger (48) which houses a low-pressure oil reservoir (49). The oil is supplied through the inlet (50) and channels (51) in the cover (L).
- Inlets (46) and (46') are provided in the spigot (42) for the purpose of lubricating the hemispherical end (41) which acts as the fulcrum.
- FIGs. 8 and 9 show from the side and from above, respectively, the arrangement of a valve control train using rockers (B1), (B2), ... as described above, for operating valves V1, V2, ... in an internal combustion engine with a single central camshaft (A).
- the engine cylinder head has a lower head part (65) into which the valves (V1) and (V2) are installed. Their springs (M) are located in recesses (60) of the lower head (65).
- valve train carrier formed by the cover (L) has fitted thereto the rocker arms (B1) and (B2), together with any other rocker arms required for the engine (see Fig. 9 ).
- This therefore forms a self-supporting assembly which can be manufactured and sold separately from the rest of the engine and provided in a pre-assembled state ready for fitting to the engine.
- the individual fitting of the rocker arms can be carried out as a separate operation, so the final assembly of the engine is significantly simpler.
- valve carrier can supply different versions of the valve carrier, all for fitting to the same engine head, but made to different specifications.
- one version may have hydraulic lash adjusters and rocker arms provided with rollers, and another, less-expensive one may have mechanical lash adjusters and a fixed cam-engaging surface on the rocker arms rather than rollers. This facilitates the production of different types of engines, suited to the customer, while still enabling a simple assembly procedure.
- the location of the respective fulcra on the cover (L) can be selected such that all the rocker arms may have the same length, and therefore can if desired be constructed identically.
- the camshaft is also fitted to the cover (L) during pre-assembly.
- Figs. 10 and 11 show an alternative embodiment of the invention, in which twin camshafts (A1, A2) drive respective rows of rocker arms (B).
- the aluminium valve train carrier (L) is best illustrated in Fig. 11 , which shows identical rocker arms (B) mounted in two lines, the arms within each line being positioned in a staggered arrangement so that they are suitably located for driving the inlet and outlet exhaust valves.
- the camshafts (A1, A2) are also preferably mounted to the carrier (L) before the entire assembly is fitted to the lower cylinder head of the engine.
- the carriers (L) of either embodiment may have channels for distributing oil to the valve trains; indeed, all the required oil channels may be located in the carrier.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
- Magnetically Actuated Valves (AREA)
- Fluid-Driven Valves (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI982136 | 1998-10-05 | ||
IT1998MI002136A IT1302601B1 (it) | 1998-10-05 | 1998-10-05 | Bilanciere dotato di elemento idraulico nel fulcro per un treno dicomando di valvole. |
PCT/IB1999/001699 WO2000020730A1 (en) | 1998-10-05 | 1999-10-05 | Valve train assembly |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1119689A1 EP1119689A1 (en) | 2001-08-01 |
EP1119689B1 EP1119689B1 (en) | 2004-01-21 |
EP1119689B2 true EP1119689B2 (en) | 2010-04-07 |
Family
ID=11380809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99970148A Expired - Lifetime EP1119689B2 (en) | 1998-10-05 | 1999-10-05 | Valve train assembly |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1119689B2 (it) |
JP (1) | JP4558938B2 (it) |
AT (1) | ATE258271T1 (it) |
BR (1) | BR9914635A (it) |
DE (1) | DE69914348T3 (it) |
IT (1) | IT1302601B1 (it) |
WO (1) | WO2000020730A1 (it) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022109243A1 (de) | 2022-04-14 | 2023-10-19 | Bayerische Motoren Werke Aktiengesellschaft | Verbrennungskraftmaschine für ein Kraftfahrzeug sowie Kraftfahrzeug |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10041466B4 (de) * | 2000-08-23 | 2008-10-09 | Man Diesel Se | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine |
FR2821891B1 (fr) * | 2001-03-09 | 2003-05-23 | Renault | Culasse de moteur thermique comportant un element superieur, formant couvre-culasse, qui porte l'arbre a cames |
DE60318836T2 (de) * | 2003-07-23 | 2009-01-22 | Eaton S.R.L., Rivarolo Canavese | Blechklammer für Kipphebel |
DE10340944A1 (de) * | 2003-09-05 | 2005-04-28 | Ina Schaeffler Kg | Ventiltrieb |
DE102004005831A1 (de) * | 2004-02-06 | 2005-08-25 | Ina-Schaeffler Kg | Verbindungsvorrichtung für einen Betätigungshebel und ein Abstützelement einer Ventilsteuerung einer Brennkraftmaschine |
JP4144625B2 (ja) * | 2006-01-19 | 2008-09-03 | トヨタ自動車株式会社 | 内燃機関のカムシャフト支持構造 |
JP4238874B2 (ja) * | 2006-01-19 | 2009-03-18 | トヨタ自動車株式会社 | 内燃機関のカムシャフト支持構造 |
DE102006002996A1 (de) * | 2006-01-21 | 2007-08-02 | Schaeffler Kg | Kipphebel aus Stahlblech |
DE102006031031A1 (de) | 2006-07-05 | 2008-01-10 | Schaeffler Kg | Hebelartiger Nockenfolger eines Ventiltriebs einer Brennkraftmaschine |
EP1881166A1 (de) * | 2006-07-21 | 2008-01-23 | Schaeffler KG | Schaltbarer Ventiltrieb für eine Brennkraftmaschine |
EP1881165A3 (de) * | 2006-07-21 | 2009-12-16 | Schaeffler KG | Schaltbarer Ventiltrieb für eine Brennkraftmaschine |
JP4611964B2 (ja) * | 2006-12-05 | 2011-01-12 | 株式会社オティックス | ロッカアーム組付モジュール |
DE102008022601A1 (de) | 2008-05-07 | 2009-11-12 | Schaeffler Kg | Hebelartiger Nockenfolger |
US8375909B2 (en) * | 2009-01-30 | 2013-02-19 | Eaton Corporation | Rocker arm retention |
EP2233704B1 (de) * | 2009-03-10 | 2011-10-26 | Schaeffler Technologies AG & Co. KG | Kipphebelträger für einen Ventiltrieb einer Brennkraftmaschine |
JP5345075B2 (ja) * | 2010-01-08 | 2013-11-20 | 株式会社オティックス | ロッカアームの製造方法 |
DE102010013942A1 (de) | 2010-04-06 | 2011-10-06 | Schaeffler Technologies Gmbh & Co. Kg | Hebelartiger Nockenfolger |
DE102011005851A1 (de) | 2011-03-21 | 2012-09-27 | Schaeffler Technologies Gmbh & Co. Kg | Ventiltriebsystem für eine Brennkraftmaschine |
GB2501876A (en) | 2012-05-08 | 2013-11-13 | Eaton Srl | Hydraulic lash adjuster |
US9482120B2 (en) * | 2013-03-25 | 2016-11-01 | GT Technologies | Retention device for valve actuating mechanism |
DE102014215129A1 (de) * | 2014-08-01 | 2016-02-04 | Schaeffler Technologies AG & Co. KG | Hebel für die Ventilbetätigung einer Brennkraftmaschine |
DE112016001685T5 (de) * | 2015-05-07 | 2018-01-25 | Eaton Corporation | Ventiltriebbaugruppe |
DE112016001680T5 (de) * | 2015-05-07 | 2018-02-15 | Eaton Corporation | Ventiltriebbaugruppe mit Deaktivierung |
US9863291B2 (en) | 2015-05-14 | 2018-01-09 | GT Technologies | Locator for use in a valvetrain of a cylinder head of an internal combustion engine |
ITUA20163586A1 (it) * | 2016-04-29 | 2017-10-29 | Gnutti Carlo Spa | Apparato di azionamento delle valvole in motore endotermico |
US11286818B2 (en) | 2016-05-10 | 2022-03-29 | Eaton Intelligent Power Limited | Modular rocker arm |
WO2017216946A1 (ja) * | 2016-06-17 | 2017-12-21 | 日鍛バルブ株式会社 | 機械式ラッシュアジャスタ |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT87113B (de) * | 1915-09-06 | 1922-01-25 | Daimler Motoren | Ventilsteuerung für Kraftmaschinen. |
DE1260864B (de) * | 1965-12-07 | 1968-02-08 | Porsche Kg | Luftgekuehlte Brennkraftmaschine |
JPS5888412A (ja) * | 1981-11-20 | 1983-05-26 | Honda Motor Co Ltd | 頭上弁式動弁機構 |
US4682575A (en) * | 1986-03-31 | 1987-07-28 | Ford Motor Company | Low friction high speed rocker arm |
US4762099A (en) * | 1986-07-08 | 1988-08-09 | Honda Giken Koygo Kabushiki Kaisha | Valve actuating device of four-cycle internal combustion engine |
US4913104A (en) * | 1988-11-30 | 1990-04-03 | Henley Manufacturing Corporation | Rocker arm for operating two valves |
JPH0397505U (it) * | 1990-01-27 | 1991-10-08 |
-
1998
- 1998-10-05 IT IT1998MI002136A patent/IT1302601B1/it active IP Right Grant
-
1999
- 1999-10-05 WO PCT/IB1999/001699 patent/WO2000020730A1/en active IP Right Grant
- 1999-10-05 JP JP2000574812A patent/JP4558938B2/ja not_active Expired - Lifetime
- 1999-10-05 EP EP99970148A patent/EP1119689B2/en not_active Expired - Lifetime
- 1999-10-05 AT AT99970148T patent/ATE258271T1/de not_active IP Right Cessation
- 1999-10-05 BR BR9914635-5A patent/BR9914635A/pt active IP Right Grant
- 1999-10-05 DE DE69914348T patent/DE69914348T3/de not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022109243A1 (de) | 2022-04-14 | 2023-10-19 | Bayerische Motoren Werke Aktiengesellschaft | Verbrennungskraftmaschine für ein Kraftfahrzeug sowie Kraftfahrzeug |
Also Published As
Publication number | Publication date |
---|---|
JP2002526707A (ja) | 2002-08-20 |
JP4558938B2 (ja) | 2010-10-06 |
DE69914348D1 (de) | 2004-02-26 |
ATE258271T1 (de) | 2004-02-15 |
ITMI982136A1 (it) | 2000-04-06 |
WO2000020730A1 (en) | 2000-04-13 |
BR9914635A (pt) | 2001-07-03 |
IT1302601B1 (it) | 2000-09-29 |
DE69914348T3 (de) | 2011-02-03 |
EP1119689B1 (en) | 2004-01-21 |
EP1119689A1 (en) | 2001-08-01 |
DE69914348T2 (de) | 2004-11-04 |
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