US3270727A - Valve rocker arm mounting - Google Patents

Valve rocker arm mounting Download PDF

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Publication number
US3270727A
US3270727A US510228A US51022865A US3270727A US 3270727 A US3270727 A US 3270727A US 510228 A US510228 A US 510228A US 51022865 A US51022865 A US 51022865A US 3270727 A US3270727 A US 3270727A
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arms
supports
rocker
support
rocker arm
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US510228A
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Robert L Nance
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Motors Liquidation Co
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Motors Liquidation Co
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18232—Crank and lever
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20582—Levers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20882—Rocker arms

Definitions

  • This invention relates to mounting of rocker arms of the type used for operatin'g poppet valves and the like in internal combustion engines and particularly to such a mounting which comprises relatively inexpensively manufactured components of simple construction and arranged to be easily assembled into an internal combustion engine to form a simple and effective rocker arm support arrangement.
  • the principal object of the present invention is to provide an improved rocker arm support arrangement of simple construction which is capable of utilizing components adapted for relatively inexpensive manufacture.
  • Such components include a plurality of rocker arm supports each having a pair of integral and oppositely extending arms on which a pair of rocker arms are pivotally supportable and designed so as to be adapted for manufacture by sintered iron fabrication. With this process, the need for machining of bearing sur'faces may be avoided.
  • simple formed metal rocker arms may be used. These may be retained in place on the arms of the support members by resilient fingers of a sheet metal retainer means which extends between two or more of the support members to orient them on the cylinder head.
  • FIGURE l is a fragmentary cross-se-ctional view of an internal combustion engine having a rocker arm support arrangement according to the invention
  • FIGURE 2 is a fragmentary plan view taken generally along the plane indicated by the line 2-2 of FIGURE 1;
  • FIGURE 3 is a side view partially in section taken generally along the plane indicated by the line 3-3 of FIG- URE 2;
  • FIGURE 4 is a pictorial view showing the rocker arm and its support
  • FIGURE 5 is a pictorial view showing the retainer means used in conjunction with the invention.
  • valves 16 which control the flow of fluids through passages 18 connecting with the various cylinders of the bank 12. It is common practice for the valves 16 to include an inlet and an outlet valve for each cylinder and the arrangement shown in the drawing is particularly intended for engines of this type although it is not necessarily limited thereto.
  • the cylinder head carries a plurality of T-shaped support members 20 spaced longitudinally along the cylinder head with one of the support members being associated with the valve gear of each cylinder in the cylinder bank.
  • Support members 20 are particularly adapted to be formed by means of sintered iron fabrication and comprise Vertical leg portions 22 of generally rectangular cross section and each having a pair of arms 24 extending oppositely from the upper end thereof. The arms are formed with arcuate bearing portions 26 extending along their lower sides while the upper sides are relieved as at 28. Extending vertically through leg portions 22 are openings 30 through which securing means, such as bolts 32, may eXtend to retain the support members in place on the cylinder head.
  • rocker arms 34, 36 is received on the arms 24 of each support member for rocking motion thereon in individually defined planes.
  • the rocker arms are each formed from a single sheet of metal and comprise parallel inner and outer sides 38 and 40, respectively, connected by a bottom wall portion 42. Openings 44 are provided intermediate the ends of inner Wall portions 38 through which arms 24 are received into the interior of the rocker arms extending into engagement with the outer side walls 40.
  • bearing surfaces 46 are provided on upwardly arcuately formed portions intermediate the ends of lower walls 42. These bearing surfaces are received on bearing portions 26 of arms 24 and provide for 'rocking motion of the rocker arms on the supports.
  • Lower walls 42 include at 'one end thereof actuating portions 48 which contact the ends of valves 16 for actuating the valves in their opening directions.
  • Coil Springs 50 bias the valves in their closing directions and tend to rotate rocker arms 36 in a counterclockwise direction, as shown in FIGURE l.
  • the rocker arms include downwardly facing spherical push rod receiving portions 52 having a lubricating opening 54 therethrough.
  • lubricant may be fed through the hollow push rod and openings 58 and 54 to lubricate the bearing surfaces 46 and 26 of the rocker arms and support arms, respectively.
  • Retainer means 60 are associated with the rocker arms and support members and serve the dual purposes of properly aligning the support members on the cylinder head of each bank and retaining the rocker arms in position on the arms of each support member.
  • Retainer means 60 include a main body 61 which is secured between the support members 20 and cylinder head 14 and extends between at least two adjacent support members. Spaced parallel side portions 62 extend upwardly from the main body 61 and engage opposite faces of the support rectangular leg portions so as to align the support members with their arms extending longitudinally of the cylinder head. Such an aligning arrangement permits the use of single bolt means for securi-ng each support member to the cylinder head, thereby simplifying the valve gear const-ruction.
  • the retainer means also includes a plurality of resilient fingers 64 which extend upwardly from the ends and intermediate portions of the main body 61 and include projections 66 which engage the outer sides of rocker arms 34, 36, holding the rocker arms in their proper positions on the arms of support members 20.
  • Valve gear for an internal combustion engine comprising a plurality of T-shaped supports secured to said engine in linearly spaced relation, each said support including a leg portion and a pair of oppositely extending arms,
  • rocker arms retained on the eXtending arms of each support for rocking motion in separate planes and a unitary retainer means extending between and engaging at least two of said supports to at least partially position them, said retainer means including a plurality of resilient fingers engagng said rocker arms at their outer ends to retain said rocker arms in position on said supports.
  • each of said rocker arms includes spaced sides connected by a formed bottom having an upwardly facing arcuate bearing surface intermediate the ends thereof, one of said sides having an opening adjacent said bearing portion,
  • said support arms extending through said rocker arm side openings and contacting the other sides to locate said rocker arms axially of said support arms and said support arms including bearing receiving surfaces in contact With said rocker arm bearing portions, said resilient fingers contacting said rocker arms other sides op-posite the outer ends of said support arms.
  • rocker arms associated one with each of said valves and mounted for rocking movement in individual planes to control the opening and closing of said valves, said rocker arms being arranged in pairs,
  • a unitary retainer extending between at least two of said supports and engaging said supports so as to fix their angular orientation with respect to said engine, said retainer including a plurality of extending fingers engaging said rocker arms to retain them in place on said supports.
  • said supports include a central leg portion integral with a pair of oppositely extending arms, said rocker arms being carried on said support arms and having outer sides engaged by said fingers, said central leg portions having single openings extendng therethrough, said supports being secured to said engine by single securing means extending through said openings.

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

Description

SeP- 6, 1966 R. L. NANcE 3,270,727
VALVE ROCKER ARM MOUNTING Filed Nov. 29, 1965 I N VENTOR.
United States Patent O 3,270,727 VALVE ROCKER ARM MOUNTING Robert L. Nance, Oak Park, Mich., assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Filed Nov. 29, 1965, Ser. No. 510,228 10 Claims. (Cl. 123-90) This invention relates to mounting of rocker arms of the type used for operatin'g poppet valves and the like in internal combustion engines and particularly to such a mounting which comprises relatively inexpensively manufactured components of simple construction and arranged to be easily assembled into an internal combustion engine to form a simple and effective rocker arm support arrangement.
The principal object of the present invention is to provide an improved rocker arm support arrangement of simple construction which is capable of utilizing components adapted for relatively inexpensive manufacture. Such components include a plurality of rocker arm supports each having a pair of integral and oppositely extending arms on which a pair of rocker arms are pivotally supportable and designed so as to be adapted for manufacture by sintered iron fabrication. With this process, the need for machining of bearing sur'faces may be avoided. Also, simple formed metal rocker arms may be used. These may be retained in place on the arms of the support members by resilient fingers of a sheet metal retainer means which extends between two or more of the support members to orient them on the cylinder head.
Further objects and advantages of the invention will be apparent from the following description of a preferred embodiment thereof selected for purposes of illustration, having reference'to the drawing, wherein:
FIGURE l is a fragmentary cross-se-ctional view of an internal combustion engine having a rocker arm support arrangement according to the invention;
FIGURE 2 is a fragmentary plan view taken generally along the plane indicated by the line 2-2 of FIGURE 1;
FIGURE 3 is a side view partially in section taken generally along the plane indicated by the line 3-3 of FIG- URE 2;
FIGURE 4 is a pictorial view showing the rocker arm and its support and FIGURE 5 is a pictorial view showing the retainer means used in conjunction with the invention.
Referring now to the drawing, numeral generally indicates an internal combustion engine having a bank of cylinders 12 'closed at the upper end thereof by a cylinder head 14. The cylinder head carries a plurality of valves 16 which control the flow of fluids through passages 18 connecting with the various cylinders of the bank 12. It is common practice for the valves 16 to include an inlet and an outlet valve for each cylinder and the arrangement shown in the drawing is particularly intended for engines of this type although it is not necessarily limited thereto.
In the disclosed embodiment, the cylinder head carries a plurality of T-shaped support members 20 spaced longitudinally along the cylinder head with one of the support members being associated with the valve gear of each cylinder in the cylinder bank. Support members 20 are particularly adapted to be formed by means of sintered iron fabrication and comprise Vertical leg portions 22 of generally rectangular cross section and each having a pair of arms 24 extending oppositely from the upper end thereof. The arms are formed with arcuate bearing portions 26 extending along their lower sides while the upper sides are relieved as at 28. Extending vertically through leg portions 22 are openings 30 through which securing means, such as bolts 32, may eXtend to retain the support members in place on the cylinder head.
Patented Sept. 6, 1966 ice A pair of left and right hand rocker arms 34, 36 is received on the arms 24 of each support member for rocking motion thereon in individually defined planes. The rocker arms are each formed from a single sheet of metal and comprise parallel inner and outer sides 38 and 40, respectively, connected by a bottom wall portion 42. Openings 44 are provided intermediate the ends of inner Wall portions 38 through which arms 24 are received into the interior of the rocker arms extending into engagement with the outer side walls 40.
Adjacent `openings 44, bearing surfaces 46 are provided on upwardly arcuately formed portions intermediate the ends of lower walls 42. These bearing surfaces are received on bearing portions 26 of arms 24 and provide for 'rocking motion of the rocker arms on the supports. Lower walls 42 include at 'one end thereof actuating portions 48 which contact the ends of valves 16 for actuating the valves in their opening directions. Coil Springs 50 bias the valves in their closing directions and tend to rotate rocker arms 36 in a counterclockwise direction, as shown in FIGURE l.
At their ends opposite from the actuating portions, the rocker arms include downwardly facing spherical push rod receiving portions 52 having a lubricating opening 54 therethrough. A hollow push rod 56 actuated by cam shaft means (not shown) engages the receiving portion 52 of each rocker arm 'and includes a lubricating passage 58 .in the end thereof which is in continuous communication with opening 54 in the rocker arm. By this means, lubricant may be fed through the hollow push rod and openings 58 and 54 to lubricate the bearing surfaces 46 and 26 of the rocker arms and support arms, respectively.
Unique retainer means 60, preferably formed from a single piece of sheet metal, are associated with the rocker arms and support members and serve the dual purposes of properly aligning the support members on the cylinder head of each bank and retaining the rocker arms in position on the arms of each support member. Retainer means 60 include a main body 61 which is secured between the support members 20 and cylinder head 14 and extends between at least two adjacent support members. Spaced parallel side portions 62 extend upwardly from the main body 61 and engage opposite faces of the support rectangular leg portions so as to align the support members with their arms extending longitudinally of the cylinder head. Such an aligning arrangement permits the use of single bolt means for securi-ng each support member to the cylinder head, thereby simplifying the valve gear const-ruction. The retainer means also includes a plurality of resilient fingers 64 which extend upwardly from the ends and intermediate portions of the main body 61 and include projections 66 which engage the outer sides of rocker arms 34, 36, holding the rocker arms in their proper positions on the arms of support members 20.
It is to be understood that the foregoing disclosure relates to only a preferred embodiment of the invention and that it is intended to cover all changes and modifications which do not constitute departures from the spirit and scope of the invention.
I claim:
1. Valve gear for an internal combustion engine and comprising a plurality of T-shaped supports secured to said engine in linearly spaced relation, each said support including a leg portion and a pair of oppositely extending arms,
a pair of rocker arms retained on the eXtending arms of each support for rocking motion in separate planes and a unitary retainer means extending between and engaging at least two of said supports to at least partially position them, said retainer means including a plurality of resilient fingers engagng said rocker arms at their outer ends to retain said rocker arms in position on said supports.
2. The combination of claim 1 wherein each of said rocker arms includes spaced sides connected by a formed bottom having an upwardly facing arcuate bearing surface intermediate the ends thereof, one of said sides having an opening adjacent said bearing portion,
said support arms extending through said rocker arm side openings and contacting the other sides to locate said rocker arms axially of said support arms and said support arms including bearing receiving surfaces in contact With said rocker arm bearing portions, said resilient fingers contacting said rocker arms other sides op-posite the outer ends of said support arms.
3. The combination of claim 1 wherein said supports are secured to said engine by single securing means and said retainer means comprise a formed sheet metal body secured between said supports and said engine and including pairs of spaced side portions extending perpendicular to the main portion of said body and engaging the leg portions of said supports to prevent their rotating around said single securing means.
4. The combination of claim 2 wherein said supports are secured to said engine by single securing means and said retainer means comprise a formed sheet metal body secured between said supports and said engine and including pairs of spaced side portions extending perpendicular to the main portion of said body and engaging the leg portions of said supports to prevent their rotating around said single securing means.
5. The combination of claim 4 wherein said supports each include single opening means extendng linearly through said leg portions and said securing means comprise single bolt means extending through said opening means.
6. The combination of claim 2 and further including spring means associated with each of said rocker arms and resiliently biasing one end thereof against rocking motion in one direction, said rocker arm other end including a lubricating opening connectable with a source of lubricant supply to transmit lubricant to said formed bottom for lubricating said arcuate bearing surface.
7. Rocker arm support arrangement for an internal combustion engine having at least four passage controlling valves,
a plurality of rocker arms associated one with each of said valves and mounted for rocking movement in individual planes to control the opening and closing of said valves, said rocker arms being arranged in pairs,
a plurality of supports secured to said engine, one carrying each said pair of rocker arms and fixing the planes of said rocking motion with respect to said engine, and
a unitary retainer extending between at least two of said supports and engaging said supports so as to fix their angular orientation with respect to said engine, said retainer including a plurality of extending fingers engaging said rocker arms to retain them in place on said supports.
8. The combination of claim 7 wherein said supports include a central leg portion integral with a pair of oppositely extending arms, said rocker arms being carried on said support arms and having outer sides engaged by said fingers, said central leg portions having single openings extendng therethrough, said supports being secured to said engine by single securing means extending through said openings.
9. The combination of claim 8 wherein said central leg portions include flat portions which are engaged by upstanding side portions of said retainer to position said supports.
10. The combination of claim 9 wherein said supports are formed of sintered iron.
References Cited by the Examiner UNITED STATES PATENTS 1,332,446 3/1920 Newton 123-90 1,477,269 12/1923 Kytlica. 2,298,981 10/1942 Smith 123-90 2,902,0l4 9/1959 Leach 123-90 2,982,273 5/1961 Bergmann 123 90 3,150,648 9/1964 Gropp 123-90 3,198,183 8/1965 Ball 123-90 FOREIGN PATENTS 866,872 5/1961 Great Britain.
MARK NEWMAN, Primary Examner. A. L. SMITH, Assistant Examiner.

Claims (1)

1. VALVE GEAR FOR AN INTERNAL COMBUSTION ENGINE AND COMPRISING A PLURALITY OF T-SHAPED SUPPORTS SECURED TO SAID ENGINE IN LINEARLY SPACED RELATION, EACH SAID SUPPORT INCLUDING A LEG PORTION AND A PAIR OF OPPOSITELY EXTENDING ARMS, A PAIR OF ROCKER ARMS RETAINED ON THE EXTENDING ARMS OF EACH SUPPORT FOR ROCKING MOTION IN SEPARATE PLANES AND A UNITARY RETAINER MEANS EXTENDING BETWEEN AND ENGAGING AT LEAST TWO OF SAID SUPPORTS TO AT LEAST PARTIALLY POSITION THEM, SAID RETAINER MEANS INCLUDING A PLURALITY OF RESILIENT FINGERS ENGAGING SAID ROCKER
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401678A (en) * 1966-11-29 1968-09-17 Chrysler Corp Rocker arm guide
DE1911299B1 (en) * 1969-03-06 1971-01-14 Rheinstahl Hanomag Ag Storage for rocker arms of internal combustion engines
US4401064A (en) * 1980-02-14 1983-08-30 Nissan Motor Company, Limited Rocker arm fitting structure
US4402284A (en) * 1980-03-03 1983-09-06 Nissan Motor Company, Ltd. Internal combustion engine rocker arm arrangement having a readily replaceable plate spring
US4653441A (en) * 1986-04-22 1987-03-31 Navistar International Corporation Engine rocker arm assembly
US4944257A (en) * 1989-09-27 1990-07-31 Henley Manufacturing Holding Company, Inc. Cold-formed rocker arm with bearing flanges and splash plate
WO1992012331A1 (en) * 1991-01-14 1992-07-23 Torrington Company Rocker arm assembly
DE4427706A1 (en) * 1994-08-04 1996-02-08 Bayerische Motoren Werke Ag Valve rocker assembly in IC engine
US5887474A (en) * 1997-03-20 1999-03-30 E & E Manufacturing Company, Inc. Method for manufacturing a rocker arm
US6263847B1 (en) 1998-06-30 2001-07-24 Harley-Davidson Motor Company Group, Inc. Breather assembly for an internal combustion engine
US6296071B1 (en) 1998-06-30 2001-10-02 Harley-Davidson Motor Company Group, Inc. Motorcycle rocker assembly
US6883505B1 (en) 2004-04-02 2005-04-26 Midwest Motorcycle Supply Rocker box assembly with reed valve
US20060000458A1 (en) * 2004-06-30 2006-01-05 Harley-Davidson Motor Company Group, Inc. Breather assembly for an internal combustion engine
DE102007012734A1 (en) * 2007-03-16 2008-09-18 Schaeffler Kg Rocker arm for valve gear of internal combustion engine in e.g. two-wheeler, has axle bearing integrated in crossbar, formed as half-shell and aligned with opening, where half shell has uniform radius, which is adapted to radius of openings

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1332446A (en) * 1919-05-24 1920-03-02 Charles H Newton Anti-sideplay attachment for valve-operating mechanism
US1477269A (en) * 1923-02-12 1923-12-11 John F Kytlica Rocker arm
US2298981A (en) * 1941-05-24 1942-10-13 Buda Co Rocker arm assembly
US2902014A (en) * 1954-06-01 1959-09-01 Gen Motors Corp Valve actuating mechanism for engines
US2982273A (en) * 1959-11-02 1961-05-02 Johnson Products Inc Double rocker arm assembly
GB866872A (en) * 1959-08-15 1961-05-03 Austin Motor Co Ltd Improvements relating to overhead valve mechanism for internal combustion engines
US3150648A (en) * 1962-12-20 1964-09-29 Ford Motor Co Valve gear
US3198183A (en) * 1964-02-21 1965-08-03 Gen Motors Corp Stud type rocker arm mounting

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1332446A (en) * 1919-05-24 1920-03-02 Charles H Newton Anti-sideplay attachment for valve-operating mechanism
US1477269A (en) * 1923-02-12 1923-12-11 John F Kytlica Rocker arm
US2298981A (en) * 1941-05-24 1942-10-13 Buda Co Rocker arm assembly
US2902014A (en) * 1954-06-01 1959-09-01 Gen Motors Corp Valve actuating mechanism for engines
GB866872A (en) * 1959-08-15 1961-05-03 Austin Motor Co Ltd Improvements relating to overhead valve mechanism for internal combustion engines
US2982273A (en) * 1959-11-02 1961-05-02 Johnson Products Inc Double rocker arm assembly
US3150648A (en) * 1962-12-20 1964-09-29 Ford Motor Co Valve gear
US3198183A (en) * 1964-02-21 1965-08-03 Gen Motors Corp Stud type rocker arm mounting

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401678A (en) * 1966-11-29 1968-09-17 Chrysler Corp Rocker arm guide
DE1911299B1 (en) * 1969-03-06 1971-01-14 Rheinstahl Hanomag Ag Storage for rocker arms of internal combustion engines
US4401064A (en) * 1980-02-14 1983-08-30 Nissan Motor Company, Limited Rocker arm fitting structure
US4402284A (en) * 1980-03-03 1983-09-06 Nissan Motor Company, Ltd. Internal combustion engine rocker arm arrangement having a readily replaceable plate spring
US4653441A (en) * 1986-04-22 1987-03-31 Navistar International Corporation Engine rocker arm assembly
US4944257A (en) * 1989-09-27 1990-07-31 Henley Manufacturing Holding Company, Inc. Cold-formed rocker arm with bearing flanges and splash plate
WO1992012331A1 (en) * 1991-01-14 1992-07-23 Torrington Company Rocker arm assembly
DE4427706A1 (en) * 1994-08-04 1996-02-08 Bayerische Motoren Werke Ag Valve rocker assembly in IC engine
US5887474A (en) * 1997-03-20 1999-03-30 E & E Manufacturing Company, Inc. Method for manufacturing a rocker arm
US6263847B1 (en) 1998-06-30 2001-07-24 Harley-Davidson Motor Company Group, Inc. Breather assembly for an internal combustion engine
US6296071B1 (en) 1998-06-30 2001-10-02 Harley-Davidson Motor Company Group, Inc. Motorcycle rocker assembly
US6345613B1 (en) 1998-06-30 2002-02-12 Harley-Davidson Motor Company Group, Inc. Breather assembly for an internal combustion engine
US6883505B1 (en) 2004-04-02 2005-04-26 Midwest Motorcycle Supply Rocker box assembly with reed valve
US20060000458A1 (en) * 2004-06-30 2006-01-05 Harley-Davidson Motor Company Group, Inc. Breather assembly for an internal combustion engine
US7063078B2 (en) 2004-06-30 2006-06-20 Harley-Davidson Motor Company Group, Inc. Breather assembly for an internal combustion engine
DE102007012734A1 (en) * 2007-03-16 2008-09-18 Schaeffler Kg Rocker arm for valve gear of internal combustion engine in e.g. two-wheeler, has axle bearing integrated in crossbar, formed as half-shell and aligned with opening, where half shell has uniform radius, which is adapted to radius of openings

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