EP0849436B1 - Schlepphebel - Google Patents

Schlepphebel Download PDF

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Publication number
EP0849436B1
EP0849436B1 EP96120301A EP96120301A EP0849436B1 EP 0849436 B1 EP0849436 B1 EP 0849436B1 EP 96120301 A EP96120301 A EP 96120301A EP 96120301 A EP96120301 A EP 96120301A EP 0849436 B1 EP0849436 B1 EP 0849436B1
Authority
EP
European Patent Office
Prior art keywords
side walls
support post
poppet valve
bridge piece
arm
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
EP96120301A
Other languages
English (en)
French (fr)
Other versions
EP0849436A1 (de
Inventor
Andrzej Calka
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.)
Sandco Automotive Ltd
Original Assignee
Sandco Automotive 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 Sandco Automotive Ltd filed Critical Sandco Automotive Ltd
Priority to EP96120301A priority Critical patent/EP0849436B1/de
Priority to DE69613477T priority patent/DE69613477T2/de
Priority to ES96120301T priority patent/ES2160203T3/es
Priority to AT96120301T priority patent/ATE202404T1/de
Publication of EP0849436A1 publication Critical patent/EP0849436A1/de
Application granted granted Critical
Publication of EP0849436B1 publication Critical patent/EP0849436B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • B21K1/205—Making machine elements valve parts rocker 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
    • F01L1/12—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
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • This invention relates to finger followers used to transfer rotary motion from an overhead camshaft into reciprocal motion of poppet valves used as inlet and outlet valves in an engine. More particularly, the invention relates to an improved finger follower arm for assembly with a roller bearing used to engage with a cam of an overhead camshaft, the arm being made by stamping a steel blank and then forging to complete the arm.
  • the present invention is particularly useful in automobiles which use internal combustion engines. Manufacturers of such engines have been concentrating for some time in making them more efficient while at the same time reducing the overall weight to improve the efficiency of the automobile generally. This has focused design efforts on making inexpensive, lighter finger follower arms which nevertheless have high structural rigidity to ensure accurate performance free of harmonic vibrations caused by repeated bending loads applied to the arm.
  • Finger followers are initially stamped in one of two ways as illustrated by Figs. 1 and 2 which are labelled "Prior Art”.
  • a follower arm 20 has a domed socket 22 at a support post end 24 of the arm, and a poppet valve end 26 has a U-shaped cross-section.
  • the structure is open downwardly so that an upwardly facing aperture 28 has to be provided for a roller bearing (as is conventional in the art).
  • a finger follower 30 seen in Fig. 2 is open upwardly. Both followers have advantages which will be apparent from the following comparisons.
  • the follower 20 is made by first stamping the general shape of the follower. At the other end, the U-shaped cross-section is shaped to accommodate a poppet valve end located between sides of the U-shaped section.
  • the aperture 28 is post formed by pushing a die through the arm to finish form the opening by flaring the material and defining side walls 32, 34. These walls must be smooth and relatively accurately positioned to guide the aforementioned roller bearing.
  • openings 36, 38 are finished to receive a pin on which the bearing is mounted.
  • the arm 20 has a number of disadvantages which are generally thought to be outweighed by the advantage that the poppet valve end 26 is well formed to receive and locate an end of the poppet valve.
  • the disadvantages include the difficulty of making the walls 32, 34 to the required specifications and the fact that the formation of the domed socket 22 inevitably results in a weakness in the structure between the socket and an adjacent transverse wall 40 bordering the aperture 28. To overcome this, relatively large gauge material must be used with resulting complications in stamping and forming as well as increased weight.
  • the arm 30 shown in Fig. 2 has advantages where the arm 20 has disadvantages and vice versa.
  • no opening 28 has to be formed so that the walls 42, 44 can be defined; and a domed socket 46 is contained within a peripheral wall which gives great rigidity.
  • a poppet valve end 48 has no guide for the poppet valve consequently a disadvantage of this arm is that the arm relies entirely on alignment of parts and resistance to misalignment to keep the poppet valve and arm in the required relationship. This is undesirable because repeated loading will inevitably result in wear and gradual exacerbation of the problem.
  • United States Patent US-5 372 097 discloses a cam follower for mounting on a lifter post to transmit oscillatory motion from an overhead cam to a valve stem to cause the valve to move between open and closed positions, the cam follower extending longitudinally and comprising a supporting end and an active end spaced longitudinally from the supporting end.
  • the supporting end includes a domed cap for engagement on the lifter post and an upstanding peripheral wall.
  • the base is crimped upwardly between the side walls to provide a channel that accommodates and rides on the upper end of the valve stem. The crimping of the base provides small gullies to encourage oil flow.
  • United States Patent US-5 016 582 discloses a rocker arm for mounting on a lifter post to transmit oscillatory motion from a cam to a valve stem, to cause the valve to move between open and closed positions.
  • a rocker arm comprises a first end portion, a second end portion, and an intermediate portion therebetween.
  • the first end portion includes a rounded recess for engagement on the lifter post and a peripheral wall.
  • the intermediate portion of the rocker arm comprises two substantially parallel side walls which are structurally integral with and form continuations of the peripheral walls of the support post end.
  • the parallel side walls have axially-aligned openings for mounting a cam contacting roller.
  • the intermediate portion of the rocker arm further has an opening formed in its bottom wall.
  • the second end portion of the rocker arm has an elongate groove for receiving the valve stem.
  • the second end portion comprises a bottom wall with two downwardly-extending inner side walls, which form the groove.
  • the downwardly-extending inner side walls are doubled back and form upwardly-extending outer side walls, which are structurally integral with and form continuations of the side walls of the intermediate portion.
  • a steel finger follower arm is provided for use with a bearing to form a finger follower of the type which in use is mounted on a support post to transmit oscillatory motion from a cam to a poppet valve to cause the valve to move linearly between open and closed positions;
  • the grooves are pressed into the upper surface of the bridge piece, so as to separate a central surface from the side walls; and the downwardly open channel is pressed into the lower surface of the bridge piece below the central surface and has a smaller width than this central surface wherein the poppet valve end has a W-shaped cross-section defined by the bridge piece and the side wall.
  • FIGS. 1 and 2 show exemplary prior art finger follower arms which illustrate the advantages and disadvantages of prior art structures. The remainder of the Figs. illustrate aspects of the present invention.
  • FIG. 3 illustrates a finger follower arm indicated generally by the numeral 50.
  • the finger follower 50 includes an arm 52 and a roller bearing 54 which, on assembly, includes a pin 56 held in place by staking ends of the pin into a chamfer 58 (one of which can be seen) around openings 60,62 in the arm 52.
  • roller bearings are conventional in the art.
  • the arm 52 includes a support post end 64 having a partial floor 66 from which extends an upstanding peripheral wall 68 which extends about a downwardly opening domed socket 70 positioned so that the floor 66 connects the socket to the peripheral wall 68.
  • This wall blends smoothly into a pair of spaced-apart and parallel upstanding side walls 72,74 which define the respective openings 60,62 for the pin 56.
  • the side walls 72,74 terminate at a poppet valve end 76 which has a generally W-shaped cross-section including a bridge piece 78 including at its ends a pair of parallel grooves 80,82 located adjacent ends of the side walls 72,74.
  • the poppet valve end 76 also defines a downwardly opening channel 84 extending longitudinally of the arm 52 from an outer extremity of this end and defined by side surfaces 86,88 and a downwardly facing bearing surface 90.
  • the surface 90 is downwardly convex to maintain sliding contact with the upper end of a poppet valve 91 (seen in ghost outline) as the finger follower moves angularly about the end 64 which is supported on a post 92, (also seen in ghost outline in Fig. 5).
  • the upper end of the post 92 is hemispherical as is the corresponding shape of the domed socket 70 to provide angular sliding movement between these parts.
  • the arm 64 is formed initially with a generally U-shaped section at the poppet valve end 76 and the end is completed by a second step to be described with reference to Figs. 6 and 7 to complete the W-shaped cross-section of this end.
  • Fig. 4 Details of the underside of the arm 52 can be seen in Fig. 4. It will be clear in this view that the domed socket 70 is formed in effect from the partial floor 66. This floor combines with the side walls 72,74 and the bridge piece 78 to define a rectangular opening 94. This opening both provides space for the roller bearing 54 and frees the bridge piece 78 for deformation into the W-shaped section as will be explained with reference to Figs. 6 and 7. The opening can also be seen in Fig. 5 which is a sectional view on line 5-5 of Fig. 1.
  • Fig. 6 illustrate the forming step used to complete the shape of the poppet valve end in 76 (Fig. 3) which starts as a U-shaped section illustrated at 100 in Fig. 6 and ends as a W-shaped cross-section previously seen in Fig. 3 and illustrated also in Fig. 7.
  • the U-shaped section 100 is positioned in a lower die 102 which is shaped to accommodate the width of the arm and includes an upstanding ridge 104 which is the complementary shape of the channel 84 seen in Figs. 3 and 4.
  • An upper die 106 has a projecting lower surface including a pair of spaced-apart ribs 108,110 separated by a central surface 112. The ribs and central surface complement the upper features of the bridge piece 78 including the grooves 80, 82 seen in Fig. 3.
  • the upper die 106 also incorporates a pair of shoulders 114,116 proportioned to engage upright wall portions 118,120 of the arm as the upper die is closed with the lower die in the manner illustrated in Fig. 7.
  • Finger followers of the type described are used extensively in internal combustion engines to operate poppet valves which control the flow of intake and exhaust gases.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Dry Shavers And Clippers (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (2)

  1. Stahlschlepphebel (50), der zur Montage an eine Trägerstange (92) vorgesehen ist, um eine Hin- und Herbewegung von einem Nocken auf ein Tellerventil (91) zu übertragen, um eine Bewegung des Ventils zwischen einer offenen und einer geschlossenen Stellung zu erreichen, wobei sich der Arm der Länge nach erstreckt und umfasst:
    ein Trägerstangenende (64), das einen nach unten offenen, gewölbten Sockel (70) zum Eingriff mit der Trägerstange und eine aufragende, umfängliche Wand (68) umfasst;
    ein Tellerventilende (76), das der Länge nach von dem Trägerstangenende beabstandet ist;
    ein Brückenteil (78) an dem Tellerventilende, welches Brückenteil eine obere und eine untere Fläche aufweist und einen nach unten offenen Kanal (84) bildet, welcher Kanal (84) parallele Seitenflächen (86, 88) aufweist, die sich der Länge nach erstrecken, sowie zwischen den Seitenflächen (86, 88) eine nach unten weisende Anliegefläche (90) zum Eingriff mit dem Tellerventil;
    ein Paar aufragende, voneinander beabstandete parallele Seitenwände (72, 74), die ausgerichtete Öffnungen (60, 62) für die Montage eines Lagers (54) definieren, wobei sich die Seitenwände (72, 74) der Länge nach zwischen dem Trägerstangenende (64) und dem Tellerventilende (76) erstrecken und sich in die umfängliche Wand (68) einfügen, wobei sich die umfängliche Wand (68) durchgehend zwischen den Seitenwänden (72,74) erstreckt, um das Trägerstangenende (64) zu versteifen, wobei die obere Fläche des Brükkenteils (78) seitlich von den Seitenwänden (72, 74) begrenzt wird; und wobei die Seitenwände (72, 74), das Trägerstangenende (64) und das Tellerventilende (76) zusammenwirken, um eine Öffnung (94) zu bilden, die Spiel für das Lager (54) schafft; und
    ein Paar Nuten (80, 82), die sich der Länge nach in der oberen Fläche des Brückenteils (78) entlang jeder der Seitenwände (72, 74) erstrecken
    dadurch kennzeichnet, dass
    die Nuten (80, 82) in die obere Fläche des Brückenteils (78) gepresst sind, um eine mittlere Fläche von den Seitenwänden (72, 74) zu trennen;
    und dass der nach unten offene Kanal (84) in die untere Fläche des Brückenteils (78) unter der mittleren Fläche gepresst ist und eine geringere Weite als diese mittlere Fläche aufweist;
    wobei das Tellerventilende (76) einen W-förmigen Querschnitt aufweist, der von dem Brückenteil (78), den Nuten (80, 82) und den Seitenwänden (72, 74) definiert wird.
  2. Stahlschlepphebel nach Anspruch 1, bei dem das Trägerstangenende ferner einen parziellen Boden (66) umfasst, der an die Öffnung angrenzt und sich zwischen dem gewölbten Sockel (70) und der umfänglichen Wand erstreckt.
EP96120301A 1996-12-18 1996-12-18 Schlepphebel Expired - Lifetime EP0849436B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP96120301A EP0849436B1 (de) 1996-12-18 1996-12-18 Schlepphebel
DE69613477T DE69613477T2 (de) 1996-12-18 1996-12-18 Schlepphebel
ES96120301T ES2160203T3 (es) 1996-12-18 1996-12-18 Balancin.
AT96120301T ATE202404T1 (de) 1996-12-18 1996-12-18 Schlepphebel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96120301A EP0849436B1 (de) 1996-12-18 1996-12-18 Schlepphebel

Publications (2)

Publication Number Publication Date
EP0849436A1 EP0849436A1 (de) 1998-06-24
EP0849436B1 true EP0849436B1 (de) 2001-06-20

Family

ID=8223508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120301A Expired - Lifetime EP0849436B1 (de) 1996-12-18 1996-12-18 Schlepphebel

Country Status (4)

Country Link
EP (1) EP0849436B1 (de)
AT (1) ATE202404T1 (de)
DE (1) DE69613477T2 (de)
ES (1) ES2160203T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011076727A1 (de) 2011-05-30 2012-12-06 Schaeffler Technologies AG & Co. KG Schlepphebel eines Ventiltriebs

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69921860T2 (de) * 1999-04-26 2005-10-20 Delphi Technologies, Inc., Troy Rollenschlepphebel
DE10030341C2 (de) * 2000-06-20 2003-04-10 Ina Schaeffler Kg Verfahren zur Herstellung eines hebelartigen Nockenfolgers
DE10218026A1 (de) * 2002-04-23 2003-11-20 Ina Schaeffler Kg Hebelartiger Nockenfolger aus Blech
JP2004025240A (ja) * 2002-06-26 2004-01-29 Koyo Seiko Co Ltd ロッカアームおよびその製造方法
DE10330881A1 (de) * 2003-07-09 2005-01-27 Ina-Schaeffler Kg Verfahren zur Herstellung eines Außenhebels eines schaltbaren Schlepphebels
DE102004018387A1 (de) * 2004-04-16 2005-11-03 Ina-Schaeffler Kg Fließgepresster Hebel für die Ventilsteuerung einer Kolbenmaschine und Verfahren zu dessen Herstellung
DE102006002996A1 (de) * 2006-01-21 2007-08-02 Schaeffler Kg Kipphebel aus Stahlblech
DE102006002994A1 (de) * 2006-01-21 2007-08-02 Schaeffler Kg Hebelartiger Nockenfolger

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5016582A (en) * 1990-10-12 1991-05-21 Henley Manufacturing Holding Company, Inc. Rocker arm
DE69309346T2 (de) * 1992-01-07 1997-07-10 Koyo Seiko Co Kipphebel mit rolle und dessen herstellungsverfahren
US5372097A (en) * 1992-12-18 1994-12-13 Welles Manufacturing Self-lubricating cam follower
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011076727A1 (de) 2011-05-30 2012-12-06 Schaeffler Technologies AG & Co. KG Schlepphebel eines Ventiltriebs

Also Published As

Publication number Publication date
DE69613477T2 (de) 2002-04-25
ES2160203T3 (es) 2001-11-01
DE69613477D1 (de) 2001-07-26
EP0849436A1 (de) 1998-06-24
ATE202404T1 (de) 2001-07-15

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