EP1775432B1 - Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels - Google Patents

Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels Download PDF

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Publication number
EP1775432B1
EP1775432B1 EP05256306A EP05256306A EP1775432B1 EP 1775432 B1 EP1775432 B1 EP 1775432B1 EP 05256306 A EP05256306 A EP 05256306A EP 05256306 A EP05256306 A EP 05256306A EP 1775432 B1 EP1775432 B1 EP 1775432B1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
control system
valve control
bridge member
valve
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.)
Ceased
Application number
EP05256306A
Other languages
English (en)
French (fr)
Other versions
EP1775432A1 (de
Inventor
Majo Cecur
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.)
Eaton SRL
Original Assignee
Eaton SRL
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 Eaton SRL filed Critical Eaton SRL
Priority to DE602005025880T priority Critical patent/DE602005025880D1/de
Priority to EP05256306A priority patent/EP1775432B1/de
Publication of EP1775432A1 publication Critical patent/EP1775432A1/de
Application granted granted Critical
Publication of EP1775432B1 publication Critical patent/EP1775432B1/de
Anticipated expiration legal-status Critical
Ceased 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
    • F01L1/02—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
    • F01L1/185—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
    • F01L1/26—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
    • 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 control system for an internal combustion engine, and more particularly, to such a system which moves a pair of engine poppet valves simultaneously, by means of a bridge member.
  • Valve control systems of the type to which the present invention relates typically include a poppet valve which is moveable between an open position and a closed position in response to pivotal movement of a rocker arm.
  • One end of the rocker arm engages some sort of "fulcrum" type member, such as, but not limited to, a hydraulic lash adjuster, such that the pivotal movement of the rocker arm is about the fulcrum member, and occurs in response to rotation of a cam shaft, in a manner generally well known in the art.
  • One of the approaches utilized by those skilled in the valve control art for actuating two poppet valves simultaneously is to provide a bridge member which engages the stem tip portions of both of the valves. Another portion of the valve control system (for example, the end of the rocker arm opposite the fulcrum member) engages the bridge member, typically at a location intermediate the two poppet valves such that the valve control system is able to move both poppet valves simultaneously, simply by moving the bridge member.
  • FIG. 1 is a perspective view of a valve control system made in accordance with the present invention, with the cylinder head omitted for ease of illustration.
  • FIG. 2 is a fragmentary, transverse cross-section of the valve control system shown in perspective in FIG. 1 , but including a fragmentary portion of the cylinder head as a point of reference.
  • FIG. 3 is an enlarged, fragmentary view, similar to FIG. 2 , illustrating in greater detail one aspect of the present invention.
  • FIG. 4 is a further enlarged, fragmentary view similar to FIG. 3 but illustrating an alternative embodiment of the present invention.
  • FIG. 5 is a schematic representation of the geometry of the conventional, prior art bridge arrangement, illustrating the change in lateral distance between the rocker arm contact with the bridge member and the contact points with the poppet valves
  • FIG. 6 is a schematic representation of the geometry on the present invention, illustrating the improved ability to maintain equidistance to the poppet valve contact points.
  • FIG. 7 is a graph of valve lift and valve velocity, as a function of cam angle, in degrees, illustrating the "designed" or intended velocity as opposed to the actual valve velocity, utilizing the prior art valve bridge.
  • FIG. 1 illustrates a perspective view of a valve control system made in accordance with the present invention. It should be noted that in FIG. 1 no portion of the cylinder head is included, for ease of illustration. It should also be noted in FIG. 1 that, what is shown is, in effect, one complete valve control system for all the valves of one cylinder, including a pair of intake valves 11 and 13 and a pair of exhaust valves 15 and 17.
  • the valve control system includes a cam shaft 19 having an intake cam profile 21 and an exhaust cam profile 23, each of the cam profiles including a base circle portion and a lift portion, as is well known to those skilled in the art.
  • Valve actuation motion is imparted to the intake valves 11 and 13, from the intake cam profile 21, by means of an intake rocker arm 25, while valve actuation motion is imparted to the exhaust valves 15 and 17, from the exhaust cam profile 23, by means of an exhaust rocker arm 27.
  • the intake rocker arm 25 has an end 25a supported on an intake hydraulic lash adjuster ("HLA") 29, which is received within a bore 30 defined in an engine cylinder head 31, and is shown in external plan view in FIG. 2 .
  • HLA 29 includes a moveable plunger portion 29P, as is well known in the HLA art.
  • the exhaust rocker arm 27 has an end 27a which is supported on an exhaust hydraulic lash adjuster 33 (see FIG. 1 ).
  • the rocker arm 25 includes an axially opposite end 25b (i.e., axially opposite the end 25a), and a cam follower 35 (also referred to typically as a "roller follower”), disposed intermediate the ends 25a and 25b of the rocker arm 25.
  • the cam follower 35 is preferably maintained in operable engagement with the intake cam profile 21, as is conventional, and well known in the engine valve train art.
  • Disposed toward the end 25b of the rocker arm 25 is a cylindrical opening 37 defined by the two side walls of the rocker arm 25, and disposed within the opening 37 is a cylindrical shaft member 39, also referred to hereinafter in the appended claims as a "pivot member".
  • the shaft member 39 is received within a mating saddle surface 41 (see FIG. 3 ) defined by a bridge member, generally designated 43, the saddle surface 41 also being referred to hereinafter in the appended claims as a "pivot member receiving portion".
  • a bridge member generally designated 43
  • the saddle surface 41 also being referred to hereinafter in the appended claims as a "pivot member receiving portion".
  • the bridge member 43 will be described in some further detail.
  • the bridge member 43 includes axially opposite valve-engaging portions 45 and 47, in engagement with the intake valves 11 and 13, respectively, the details of such engagement to be described in greater detail in connection with a subsequent embodiment.
  • FIG. 4 there is illustrated an alternative embodiment of the invention, in which like elements bear the same reference numerals, and modified elements bear the same reference numeral, plus “100”. Therefore, in the alternative embodiment of FIG. 4 , there is shown a bridge member, generally designated 143, which is preferably, but not necessarily, formed as a flat, stamped steel member, although it should be apparent that other metals, or even other forming processes, could be utilized to manufacture the bridge member 143.
  • the bridge member 143 defines a circular opening 141, also referred to hereinafter as the "pivot member receiving portion", and disposed within the opening 141 is the cylindrical shaft member 39.
  • the bridge member 143 includes, in the same manner as in the first embodiment, a pair of axially spaced-apart valve-engaging portions 145 and 147, in engagement with the intake valves 11 and 13, respectively.
  • each of the valve-engaging portions 145 and 147 includes an engagement surface, in direct engagement with the valve stem tip, which is both radiused and crowned, for reasons to be described in greater detail subsequently.
  • the valve-engaging portions 145 and 147 each include an engagement surface 149 which, preferably, defines a slight curve in the plane of FIGS. 4 and 6 , and a slight crown in a plane perpendicular to that of FIGS. 4 and 6 .
  • the contact point (generically, "CP") of the engagement surface 149 with the valve stem tip surface will tend to remain at substantially the same distance from the axis A of the cylindrical shaft member 39.
  • FIGS. 5 and 6 there is presented a schematic comparison of the "Prior Art” ( FIG. 5 ) and the “Invention” ( FIG. 6 ).
  • the contact point of each valve engaging portion with its respective valve stem tip (labeled “CP2" and “CP3” in FIG. 5 ) is relatively fixed, but the point of contact (“CP1") of the rocker arm (“ROCKER ARM”) and the bridge member (“BRIDGE”) moves laterally (back-and-forth between the valves 11 and 13) as the rocker arm pivots, during the lift event.
  • CP1 point of contact
  • ROCKER ARM rocker arm
  • BRIDGE bridge member
  • the point of contact (“CP4") between the rocker arm (actually, between the shaft member 39) and the bridge member 143 is fixed as the rocker arm pivots during the lift event.
  • the contact point (“CP5") of the valve-engaging portion 145 with the stem tip of the valve 11 remains “fixed” on the portion 145, but moves laterally relative to the stem tip of the valve 11.
  • the contact point (“CP6") of the valve-engaging portion 147 with the stem tip of the valve 13 remains “fixed” on the portion 147, but moves laterally relative to the stem tip of the valve 13.
  • valves 11 and 13, or 15 and 17 which are intended to move as a pair, are designed to have the same valve velocity (V D ), such does not occur in actual practice. Instead, as the distances X2 and X3 vary, the valve velocities (V v1 and V v2 ) will differ from the designed valve velocity (V D ), and will vary from each other, as shown.
  • V D valve velocity
  • One adverse result is shown in the region of the graph in FIG. 7 identified as "Valve Close", wherein it may be seen that the varying velocities of the two valves results in quite different "profiles" just before closing of the valves.
  • the same bridge member (43 or 143) and the same rocker arm 25 design i.e., the same "part number" could be used for both the intake poppet valves 11 and 13 and for the exhaust poppet valves 15 and 17.
  • the same bridge member (43 or 143) and the same rocker arm 25 design i.e., the same "part number"
  • engagement surfaces 149 being radiused, such that if, for example, the separation of the intake poppet valves 11 and 13 is slightly greater than that of the exhaust poppet valves 15 and 17, the crowns of the engagement surfaces 149 will merely engage the stem tips of the valves 11 and 13 slightly “inside” of their center lines, while the engagement surfaces 149 will engage the stem tips of the valves 15 and 17 slightly “outside” of their center lines.
  • such slight changes in geometry will not effect the resulting forces applied to the valves, or the dynamics associated therewith.
  • the bridge member of the present invention may engage the shaft member 39 about only 180 degrees (i.e., the saddle surface 41), as shown in FIGS. 2 and 3 , or the bridge member may, alternatively, wrap all around the shaft member, as shown in FIGS. 1 , 4 , and 6 . It is anticipated that the version of the invention in which the shaft member 39 merely passes through an opening (as at 141) in the bridge member may represent and improvement, in terms of production and assembly cost.
  • the invention has been described in great detail in the foregoing specification, and it is believed that various alterations and modifications of the invention will become apparent to those skilled in the art from a reading and understanding of the specification. It is intended that all such alterations and modifications are included in the invention, insofar as they come within the scope of the appended claims.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (4)

  1. Ventilsteuerungssystem für eine Verbrennungsmaschine umfassend einen Zylinderkopf (31), ein erstes (11) und zweites (13) Tellerventil, die relativ zum Zylinderkopf zwischen einer offenen (Abb. 1) und einer geschlossenen (Abb. 2) Position verschiebbar sind; eine Nockenwelle (19) mit einem Nockenprofil (21); wobei das Ventilsteuerungssystem einen Schlepphebel (25) mit einem ersten (25a) und einem zweiten (25b) axial gegenüberliegenden Ende und einen Nockenstößel (35) aufweist, der zwischen den Enden des Schlepphebels (25) angeordnet und so ausgelegt ist, dass er in das Nockenprofil (21) eingreift; das erste Ende (25a) steht mit einer Drehachse (29) in Eingriff, die üblicherweise relativ zum Zylinderkopf (31) unbeweglich ist, wobei der Schlepphebel (25) bei Drehbewegung des zweiten Endes (25b) über die Drehachse (29) aufgrund der Drehung der Nockenwelle (19) eingreift; ein Brückenglied (42; 143), das für den Betrieb mit dem zweiten Ende (25b) des Schlepphebels verbunden ist, steht mit dem ersten (11) und zweiten (13) Tellerventil in Eingriff, wobei sich die genannten Tellerventile je nach Drehbewegung des Schlepphebels in geöffnetem oder geschlossenem Zustand befinden; wobei das Ventilsteuerungssystems ferner aufweist: eine Vorrichtung (37, 39) geeignet zum Fixieren der lateralen Position des Brückenglieds (42; 143) relativ zum zweiten Ende (25b) des Schlepphebels (25), um eine Achse (A) zu bilden, gekennzeichnet durch Mittel (39), das eines der Brückenglieder (43; 143) aufweist und dem zweiten Ende (25b), das ein Drehelement (39) bildet, sowie dem anderen Brückenglied und dem zweiten Ende (25b), das ein Aufnahmeteil (37) des Drehelements bildet und dem Brückenglied (43; 143), das Eingriffsabschnitte des ersten und zweiten Ventils aufweist, die abgerundet und ballig sind und mit dem ersten (11) bzw. dem zweiten (13) Tellerventil zusammenwirken, um den ersten (CP5) und zweiten (CP6) Kontaktpunkt zu bilden, wobei wenn der Schlepphebel (25) in die Drehbewegung eingreift, bleibt der erste (CP5) bzw. der zweite (CP6) Kontaktpunkt an den Eingriffsabschnitten des ersten bzw. zweiten Ventils fixiert, bewegt sich aber seitlich relativ zur Spindel des ersten (11) und zweiten (13) Tellerventils, so dass die seitliche Entfernung von der Achse (A) zum ersten Kontaktpunkt (CP5) und zum zweiten Kontaktpunkt (CP6) im Wesentlichen konstant und gleich bleibt.
  2. Ventilsteuerungssystem gemäß Anspruch 1, gekennzeichnet durch die Drehachse, die einen Hydrostößel (29) in einer Bohrung (30) aufweist, und durch den Zylinderkopf (31), den Hydrostößel (29), einschließlich eines verschiebbaren Stößels (29P) sowie dem ersten Ende (25a) des Schlepphebels (25), das in den Stößel eingreift (29P), definiert ist.
  3. Ventilsteuerungssystem gemäß Anspruch 1, gekennzeichnet durch ein Drehelement mit einem im Allgemeinen zylindrischen Glied (39), wobei das Aufnahmeteil des Drehelements die Form einer Sattelfläche aufweist (41; 141), der für die Aufnahme und das Eingreifen des zylindrischen Glieds (39) über wenigstens einen wesentlichen Teil desselben ausgelegt ist.
  4. Ventilsteuerungssystem gemäß Anspruch 3, gekennzeichnet durch das im Allgemeinen zylindrische Glied (39), das das zweiten Ende (25b) des Schlepphebels (25) und das Brückenglied (43; 143) aufweist, wobei die sattelförmige Oberfläche (41:141) definiert wird, um das zylindrische Glied aufzunehmen und den Abstand dazu so gering wie möglich zu halten.
EP05256306A 2005-10-11 2005-10-11 Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels Ceased EP1775432B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE602005025880T DE602005025880D1 (de) 2005-10-11 2005-10-11 Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels
EP05256306A EP1775432B1 (de) 2005-10-11 2005-10-11 Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05256306A EP1775432B1 (de) 2005-10-11 2005-10-11 Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels

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EP1775432A1 EP1775432A1 (de) 2007-04-18
EP1775432B1 true EP1775432B1 (de) 2011-01-12

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EP05256306A Ceased EP1775432B1 (de) 2005-10-11 2005-10-11 Rollenschlepphebel mit Ventilbrücke als integraler Bestandteil des Rollenschlepphebels

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DE (1) DE602005025880D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8210144B2 (en) 2008-05-21 2012-07-03 Caterpillar Inc. Valve bridge having a centrally positioned hydraulic lash adjuster
CN103334804A (zh) * 2013-07-15 2013-10-02 安徽江淮汽车股份有限公司 一种发动机用气门摇臂
ITUA20163586A1 (it) * 2016-04-29 2017-10-29 Gnutti Carlo Spa Apparato di azionamento delle valvole in motore endotermico
DE102019124549A1 (de) * 2019-08-12 2021-02-18 Schaeffler Technologies AG & Co. KG Brücke für einen Ventiltrieb einer Heavy-Duty-Brennkraftmaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996807A (en) * 1933-09-25 1935-04-09 Gen Motors Corp Valve gear for operating dual valves
US3021826A (en) * 1959-11-23 1962-02-20 Gen Motors Corp Rocker arm and multiple valve actuating mechanism
US3140698A (en) * 1962-04-13 1964-07-14 Voorhies Carl Hydraulic tappet unit inverted
IT1195192B (it) * 1986-10-07 1988-10-12 Fiat Auto Spa Comando valvole per motori ad alberi a camme in testa
US4924821A (en) * 1988-12-22 1990-05-15 General Motors Corporation Hydraulic lash adjuster and bridge assembly
DE9405442U1 (de) * 1994-03-31 1995-08-03 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen 4-Ventil-Kolbenbrennkraftmaschine
US5410995A (en) * 1994-04-15 1995-05-02 Cummins Engine Company, Inc. Valve crosshead assembly with wear-reducing contact pad
US6474282B1 (en) * 2001-07-26 2002-11-05 Toledo Technologies Inc. Flat rocker arm having a clevis

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Publication number Publication date
EP1775432A1 (de) 2007-04-18
DE602005025880D1 (de) 2011-02-24

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