EP1157193B1 - Rollenschlepphebel - Google Patents

Rollenschlepphebel Download PDF

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Publication number
EP1157193B1
EP1157193B1 EP99920002A EP99920002A EP1157193B1 EP 1157193 B1 EP1157193 B1 EP 1157193B1 EP 99920002 A EP99920002 A EP 99920002A EP 99920002 A EP99920002 A EP 99920002A EP 1157193 B1 EP1157193 B1 EP 1157193B1
Authority
EP
European Patent Office
Prior art keywords
side walls
section
finger follower
roller finger
roller
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
Application number
EP99920002A
Other languages
English (en)
French (fr)
Other versions
EP1157193A1 (de
Inventor
Cynthia Greene
Timothy Wilton Kunz
Thomas Austin Braun
Shawn H. Russell
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.)
Okay Industries Inc
Delphi Technologies Inc
Okay Ind Inc
Original Assignee
Okay Industries Inc
Delphi Technologies Inc
Okay Ind Inc
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=22272623&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1157193(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Okay Industries Inc, Delphi Technologies Inc, Okay Ind Inc filed Critical Okay Industries Inc
Publication of EP1157193A1 publication Critical patent/EP1157193A1/de
Application granted granted Critical
Publication of EP1157193B1 publication Critical patent/EP1157193B1/de
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
    • F01L1/12—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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2305/02—Mounting of rollers

Definitions

  • This invention relates to a roller finger follower for use in an internal combustion engine.
  • FIGURES 1 and 2 Before describing the preferred example of the present invention, a brief consideration of a typical prior art stamped roller finger follower, shown in FIGURES 1 and 2 will help to better understand the importance of some of the example features of the present invention.
  • a typical prior art stamped roller finger follower 10 has a relatively large overall width W1 compared to wall material thickness t.
  • the front guide walls 12 at the end of the part which contacts the engine valve stem are formed by two layers of material joined in a tight bend.
  • the lash adjuster socket 14 (at the end of the part removed from the legs 12) is an open spherical segment (not seen) facing the bottom of the part to receive the lash adjuster pivot, and the top side of the socket is a full spherical segment 16 located between the side walls 18.
  • the walls 18 are formed of one layer of material of thickness t
  • the legs 12 are each formed of two layers of material of thickness t.
  • the walls 18 must be spaced apart so as to accommodate the full dimension of spherical segment 16. All of this contributes to a wide part with flat guide walls that have relatively short flat surfaces for guidance on the valve for the typical prior art stamped roller finger follower.
  • the width W2 of pallet space 19 available to receive the valve stem is only a wall material thickness t or slightly more. Accordingly, the minimum width W1 for this prior art configuration is at least five wall material thicknesses t, and the ratio W2:W1 is about 1:5. Since pallet space 19 must be wide enough to accept the tip of the valve stem, the relationship between W2 and W1 is that W2 cannot exceed more than about 20% of W1 in order to minimize W1.
  • EP 0 573 674A1 Another prior art roller finger follower is disclosed in EP 0 573 674A1. That patent discloses a configuration in which the pallet 14 is welded between the legs 11b and 11c. As with the prior art of FIGURES 1 and 2, the legs defining the pallet area are each twice the thickness of the walls 11b, 11c, and the overall width is dictated by the pallet width. As shown in EP 0 573 674A1, the pallet width may be greater than 20% of the overall width of the part, but that is achieved only at the expense of enlarging the overall width to more than five wall material thicknesses. Note, also, that the pallet end of this part is the full width of the part, so this pallet end can only be accommodated in an engine space which is wide enough to accept the entire roller finger follower.
  • roller finger follower of the present invention as defined in claim 1.
  • An advantage of the present invention is a new and improved roller finger follower having improved size and strength characteristics. While not limited thereto, the improved roller finger follower is particularly suitable for use in engines where space considerations limit the size of the roller finger follower.
  • roller finger follower is produced by a process of stamping and cold extrusion, and a preferred embodiment has four important features.
  • the manufacturing process starts with flat stock material.
  • a blank and a preform part are formed by a series of stamping steps.
  • the preform has a pair of spaced apart sidewalls, each of thickness equal to the thickness of the original flat stock material.
  • the stamped preform is then cold extruded to thicken the sidewalls and form retaining legs at the pallet end which is intended to receive the valve stem.
  • the first of the features of the example roller finger follower of this invention is an overall channel configuration, with the side walls being folded up and the roller pocket area being drawn down to have a high ratio of height-to-width at the location of the bores which house the roller shaft.
  • This configuration allows greater design and process freedom in that a narrower overall part width requirement can be achieved without sacrificing strength or stiffness. Also, the ratio of height to width in the vicinity of the shaft bores is greater than the prior art.
  • the second feature of the example roller finger follower of this invention is the solid and thin legs which are formed by cold extrusion and which extend down from the vertical side walls at the front (pallet) end of the channel structure where the roller finger follower contacts the tip of the engine valve.
  • the legs provide structure to prevent disengagement between the valve stem and the roller finger follower.
  • a preferred channel stamped roller finger follower could have an overall width of about three (3) times the side wall material thickness in the pallet area, whereas prior art standard and reverse channel configurations would require approximately five (5) times the side wall material thickness for a minimum width.
  • Some prior art cast roller finger followers may have solid front legs, but these cast parts are much more expensive to produce. Because the depending legs are thin, the width W2 available to receive a valve stem can approach the overall width W1 in the pallet area of the part (see FIGURE 6). The narrow valve end of this roller finger follower minimizes effective valve end reciprocating mass, in turn minimizing system loads and friction.
  • the third feature of the example roller finger follower of this invention is the use of a truncated spherical hydraulic lash adjuster socket.
  • the socket is truncated on the nonfunctional side, i.e., the side removed from the side contacting the pivot of the hydraulic lash adjuster, while the side contacting the pivot of the hydraulic lash adjuster retains its sphericity.
  • Part of the nonfunctional surface of the socket is merged by cold extrusion into the side walls. This strengthens the side walls and contributes to the narrow width of the part.
  • the fourth feature of the example roller finger follower of this invention is the use of noncircular shaft bores for the roller shaft. This locks and retains the roller shaft in the part during the joining process.
  • roller finger follower 20 has side walls 22 separated by an interrupted web 24 to form, in effect, a channel.
  • Web 24 has a stamped opening 26 formed therein to provide an operating space or pocket for a roller assembly 28 which is mounted on a shaft 30 housed in pierced or pierced and shaved bores 32 in side walls 22.
  • Roller finger follower 20 is characterized by a high H/W ratio (see FIGURES 4, 5 and 6). This high height to width ratio allows for taller vertical walls 22 in the vicinity of the shaft bores than in the prior art, which improves the stiffness and strength of the part, while still meeting a narrow package width requirement.
  • a second important feature is the configuration of the pallet end of the part which contacts the tip of the engine valve stem.
  • This part is defined by a pair of spaced apart solid legs 34 which form guide walls defining a pocket 36 to receive the tip of the valve stem.
  • Solid legs 34 extend downwardly from their respective side walls 22, and the legs are formed in the manufacturing process by folding the flat stock upward to form the side walls and then cold extruding material downward to form the solid legs 34. It is to be noted that the legs 34 are considerably thinner than the material thickness t1 of the walls 22 from which the legs depend.
  • the overall width W1 of the part at the pallet end (i.e., the right end in FIGURES 3, 4, 5, 8 and 9) is in the range of about 2.5t1 to about 4.0tl, where t1 is the material thickness of a wall 22.
  • the minimum dimension i.e., W1 being about 2.5t1
  • W1 being about 2.5t1
  • the punch forming the upper space between walls 22 at the pallet end be about 0.5t1.
  • W2(max) can be 3.6t1 and W2(min) can be 2.2t1.
  • W2(min) can be 2.2t1.
  • This socket includes a spherical (i.e., a portion of a sphere) recess 38 on the bottom side to receive the top of the hydraulic lash adjuster.
  • the top or nonfunctional side 40 of the socket is not a full spherical segment. Rather, the nonfunctional side 40 is truncated along the inner portions of side walls 22. This truncation is effected by drawing material from the nonfunctional side 40 of the socket up into side walls 22 during the manufacturing process; and this is accomplished without reducing the size or shape of the spherical portion 38 which receives the hydraulic lash adjuster.
  • the use of the truncated spherical portion 40 results in reducing the width W of the roller finger follower. This is in distinction from the prior art where the minimum possible width of prior art roller finger followers is determined by the required socket diameter and depth.
  • the shaft bore in the side walls 22 may be noncircular.
  • the bore may be octagonal as in FIGURE 11a, oval as in FIGURE 11b or splined as in FIGURE 11c.
  • These noncircular bore shapes are pierced and/or shaved into the side walls 22 as part of the forming process to aid in retention of the roller shaft 30.
  • the ends of the roller shaft are relatively soft, and when these soft ends are staked or riveted in the bores, they are deformed to correspond to the shape of the bore, thereby locking the ends of the roller shaft into the shaft bores.
  • a cam In operation of the stamped roller finger follower, a cam, not shown, bears against roller 28 to transmit the lift of the cam to the engine valve stem.
  • the lift of the cam is multiplied by the rocker arm ratio of the roller finger follower. That ratio is the ratio of instantaneous valve lift to instantaneous cam lift, and this ratio varies throughout one rotation of the cam and is dependent on the geometry of the roller finger follower and how it is oriented in the valve train.
  • the roller finger follower 20 pivots about a spherical head of a hydraulic lash adjuster (HLA) or stud.
  • the spherical head mates in spherical socket 38 in the roller finger follower 20.
  • the roller finger follower contacts the cam with a roller bearing assembly 28, supported on a roller shaft 30.
  • the roller shaft is housed in and supported by the roller shaft bore 32 in the roller finger follower.
  • the valve pallet (defined by legs 34 and pocket 36) of the roller finger follower contacts the valve tip of the valve stem of an engine valve.
  • the shape of the vertical side walls 22 and the roller pocket 26 are formed from a flat piece of stock material by a process of forming a blank and a preform part from a coil of stock material by a series of stamping steps.
  • the stock material is then folded upward in a further stamping step, and the material is then cold drawn downward in the roller pocket area to enlarge the side walls 22 around the openings 32 to prevent weakening of the side walls in the vicinity of the openings 32.
  • Roller pocket 26 is subsequently formed by punching, and bores 32 are formed by piercing or piercing and then shaving.
  • This manufacturing process allows greater design and process freedom than the standard channel or standard reverse channel configurations of the prior art where the wall height below or above the roller shaft bores is limited based on the allowable follower width, which can decrease the strength and/or stiffness or require a wider package width than the example of the present invention.
  • FIGURES 10a - 10c illustrate a comparison of the example manufacturing process for the present invention as compared to the prior art.
  • FIGURES 10a, b and c shows a starting piece of flat stock material for forming a stamped roller finger follower.
  • FIGURE 10a depicts the starting configuration and various parameters for the example roller finger follower of the present invention;
  • FIGURE 10b depicts the starting configuration and various parameters for a standard channel prior art stamped roller finger follower;
  • FIGURE 10c depicts the starting configuration and various parameters for a reverse standard channel prior art stamped roller finger follower. Referring to FIGURE 10a

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Massaging Devices (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Organic Insulating Materials (AREA)
  • Dental Preparations (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Claims (6)

  1. Rollenschlepphebel, mit:
    einem gestanzten und kalt stranggepressten länglichen Metallteil (20), das einen allgemein kanalförmigen Querschnitt aufweist und erste und zweite beabstandete Seitenwände (22) umfasst, die durch einen Stegabschnitt (24) miteinander verbunden sind;
    wobei jede der Seitenwände eine Dicke (t1) aufweist;
    einem Paar von abhängigen Beinen (34), wobei sich jeweils eines der Beine von jeder der Seitenwände benachbart eines ersten Endes der Seitenwände abwärts erstreckt, wobei jedes der abhängigen Beine eine Dicke (t2) aufweist, die kleiner als die Dicke (t1) der Seitenwand ist, von der sie abhängt;
    einem Trägerabschnitt (36) an dem ersten Ende der Seitenwände zwischen den abhängigen Beinen, wobei der Trägerabschnitt derart ausgebildet ist, dass er eine Motorventilschaft aufnehmen kann;
    einem ausgenommenen Sockel (38) in dem Stegabschnitt benachbart eines zweiten Endes der Seitenwände zur Aufnahme des Endes einer Stange;
    wobei der Rollenschlepphebel einen schmalen Abschnitt an dem Ende, das den Trägerabschnitt umfasst, und einen breiteren Hauptkörperabschnitt umfasst, wobei die Breite des schmalen Abschnittes im Bereich von etwa 2,5 t1 bis 4,0 t1 liegt; und
    wobei die Breite des Trägerabschnittes zwischen den abhängigen Beinen im Bereich von etwa 0,7 t1 bis etwa 3,6 t1 liegt.
  2. Rollenschlepphebel nach Anspruch 1, wobei die Breite (t2) von jedem der abhängigen Beine das etwa 0,2- bis etwa 0,90-fache der Breite (t1) von jeder der Seitenwände beträgt.
  3. Rollenschlepphebel nach Anspruch 1, wobei der ausgenommene Sockel ein funktionelles kugelförmiges Segment (38) an der unteren Seite aufweist, das zur Aufnahme des Endes einer Stange offen ist; und
       eine nicht funktionelle obere Seite (40) zwischen den Seitenwänden positioniert ist, wobei die Rückseite durch Kaltstrangpressen auf weniger als ein kugelförmiges Segment zwischen den Seitenwänden abgestumpft ist.
  4. Rollenschlepphebel nach Anspruch 1, mit gegenüberliegenden Bohrungen (32) in jeder der Seitenwände zur Aufnahme einer Rollenbefestigungswelle, wobei das Verhältnis der Höhe (H) der Seitenwände zu der Breite (W) des Rollenschlepphebels aus Gründen einer hohen Steifigkeit in einem schmalen Paket maximiert ist, indem die Seitenwände aufwärts gefaltet und dann in den Rollentaschenbereich heruntergezogen sind.
  5. Rollenschlepphebel nach Anspruch 4, wobei jede der Bohrungen durch Stanzen ausgebildet ist und die Form von jeder der Bohrungen nicht kreisförmig ist.
  6. Rollenschlepphebel nach Anspruch 4, wobei jede der Bohrungen durch Stanzen und Nachschneiden bzw. Hobeln ausgebildet ist, und die Form von jeder der Bohrungen nicht kreisförmig ist.
EP99920002A 1999-04-26 1999-04-26 Rollenschlepphebel Expired - Lifetime EP1157193B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1999/008935 WO2000065202A1 (en) 1999-04-26 1999-04-26 Roller finger follower

Publications (2)

Publication Number Publication Date
EP1157193A1 EP1157193A1 (de) 2001-11-28
EP1157193B1 true EP1157193B1 (de) 2004-11-10

Family

ID=22272623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99920002A Expired - Lifetime EP1157193B1 (de) 1999-04-26 1999-04-26 Rollenschlepphebel

Country Status (5)

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EP (1) EP1157193B1 (de)
AT (1) ATE282142T1 (de)
AU (1) AU3759599A (de)
DE (1) DE69921860T2 (de)
WO (1) WO2000065202A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008003653A1 (de) * 2006-07-05 2008-01-10 Schaeffler Kg Schlepp- oder kipphebel für einen ventiltrieb einer brennkraftmaschine
DE102008022601A1 (de) 2008-05-07 2009-11-12 Schaeffler Kg Hebelartiger Nockenfolger
DE102010033090A1 (de) 2010-08-02 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Schlepphebel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10218026A1 (de) * 2002-04-23 2003-11-20 Ina Schaeffler Kg Hebelartiger Nockenfolger aus Blech
JP4525435B2 (ja) 2005-04-14 2010-08-18 株式会社ジェイテクト ロッカアーム
DE102012218661A1 (de) * 2012-10-12 2014-05-15 Schaeffler Technologies Gmbh & Co. Kg Hebelartiger Nockenfolger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5048475A (en) * 1991-01-17 1991-09-17 Henley Manufacturing Holding Company, Inc. Rocker arm
JP3306478B2 (ja) 1993-11-29 2002-07-24 光洋精工株式会社 プレス製ロッカアーム
ATE202404T1 (de) * 1996-12-18 2001-07-15 Sandco Automotive Ltd Schlepphebel
DE19710867A1 (de) * 1997-03-15 1998-09-17 Schaeffler Waelzlager Ohg Betätigungshebel für einen Ventiltrieb einer Brennkraftmaschine
DE19743488A1 (de) * 1997-10-01 1999-04-08 Bayerische Motoren Werke Ag Zylinderkopf mit Ventilsteuerung für eine Brennkraftmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008003653A1 (de) * 2006-07-05 2008-01-10 Schaeffler Kg Schlepp- oder kipphebel für einen ventiltrieb einer brennkraftmaschine
DE102008022601A1 (de) 2008-05-07 2009-11-12 Schaeffler Kg Hebelartiger Nockenfolger
DE102010033090A1 (de) 2010-08-02 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Schlepphebel

Also Published As

Publication number Publication date
ATE282142T1 (de) 2004-11-15
WO2000065202A1 (en) 2000-11-02
DE69921860T2 (de) 2005-10-20
DE69921860D1 (de) 2004-12-16
EP1157193A1 (de) 2001-11-28
AU3759599A (en) 2000-11-10

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