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US20130220254A1 - Rocker arm - Google Patents

Rocker arm Download PDF

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Publication number
US20130220254A1
US20130220254A1 US13/780,889 US201313780889A US2013220254A1 US 20130220254 A1 US20130220254 A1 US 20130220254A1 US 201313780889 A US201313780889 A US 201313780889A US 2013220254 A1 US2013220254 A1 US 2013220254A1
Authority
US
United States
Prior art keywords
center
section
rocker arm
lever body
gas exchange
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.)
Abandoned
Application number
US13/780,889
Inventor
Oliver Witter
Michael Kress
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRESS, MICHAEL, WITTER, OLIVER
Publication of US20130220254A1 publication Critical patent/US20130220254A1/en
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG MERGER AND CHANGE OF NAME Assignors: Schaeffler Technologies AG & Co. KG, SCHAEFFLER VERWALTUNGS 5 GMBH
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258. Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Abandoned 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
    • F01L1/181—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
    • 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

Definitions

  • the invention concerns a rocker arm for actuating a gas exchange valve of an internal combustion engine.
  • rocker arms are located in a valve train as transmission elements between cams and the gas exchange valves to be actuated.
  • Rocker arms consist of a lever body that is supported at one of its ends on a support element and with its other end engages, through a contact surface, the gas exchange valve to be opened.
  • a cam pickup surface is provided in a section of the lever body near the center, on which a cam of a camshaft runs during operation of an internal combustion engine, causing a pivoting motion of the rocker arm.
  • the cam pickup surface can be implemented as a sliding surface or as a cam roller.
  • a rocker arm for actuating a gas exchange valve of an internal combustion engine is known from DE 10 2008 029,333 A1.
  • the rocker arm has an oval opening that encompasses a valve stem end of the gas exchange valve.
  • the rocker arm provides a cam roller in a section near the center.
  • WO2011/157499 A1 discloses a rocker arm that has a cam roller supported on an axle pin by means of a needle roller and cage assembly.
  • a contact surface for a valve stem end of the gas exchange valve is provided at one end of the rocker arm.
  • Side bars are provided in the region of the contact surface to guide the rocker arm on the valve stem end.
  • the object of the present invention is to provide a rocker arm that can be manufactured economically and that ensures adequate stiffness.
  • a rocker arm for actuating at least one gas exchange valve of an internal combustion engine having an elongated lever body with a floor and with side walls angled away therefrom, wherein a first end section of the lever body has a cup for a support element formed in the floor, and in that a section near the center is provided with a cam engagement surface and in that a second end section of the lever body has a contact surface for a valve stem end of the gas exchange valve, wherein a crossbar extends between the section near the center and the second end section and wherein the crossbar has a stamping that is provided on the side facing away from the section near the center.
  • the crossbar is provided with a stamping.
  • the stamping can be an embossing, for example.
  • the stamping in the crossbar makes it possible to avoid contact between the valve stem end and the lever body during pivoting motions of the rocker arm.
  • the necessary stiffening of the rocker arm is ensured by the crossbar, which in turn results in increased strength of the rocker arm.
  • the shape of the stamping is matched to the valve stem end.
  • the shape of the stamping is designed to be complementary to the shape of the valve stem end.
  • the stamping is implemented as a cylindrical molding.
  • the second end section of the lever body has a W-shaped profile when viewed in cross-section.
  • the W-shaped profile preferably is open in the direction facing away from the gas exchange valve. However, a reversed arrangement of the W-shaped profile is also possible.
  • a distance between a longitudinal center of the cup and a center of rotation of the cam pickup surface is half as large as or less than half a distance between the longitudinal center of the cup and a center of a contact region of the gas exchange valve at the contact surface. Accordingly, the cam pickup surface can be positioned close to the contact region of the gas exchange valve. This has the advantage that the overall length of the rocker arm can be shortened to achieve a compact component.
  • the cam pickup surface is implemented by a cam roller, and the section near the center has a recess in the floor that serves to accommodate the cam roller.
  • the recess in the floor creates the necessary free space for the cam roller so that rotary motion of the cam roller is possible.
  • the lever body is either produced by stamping and forming techniques from a sheet metal material, or by extrusion molding.
  • stamping and forming techniques from a sheet metal material, or by extrusion molding.
  • other materials and manufacturing methods are also possible.
  • FIG. 1 a rocker arm according to the invention in a perspective view
  • FIG. 2 a bottom view of the rocker arm according to the invention.
  • FIG. 3 a longitudinal cross-section through the rocker arm according to the invention.
  • FIGS. 1 and 2 each show different views of a rocker arm 1 according to the invention.
  • the rocker arm 1 has an elongated lever body 2 , which has a floor 3 and side walls 4 , 5 angled away therefrom.
  • the floor 3 and the side walls 4 , 5 form a W-shaped profile when viewed in cross-section.
  • the lever body 2 which is made of a sheet metal material, is divided into a first end section 6 , a section 7 near the center, and a second end section 8 .
  • a cup 9 Formed in the part of the floor 3 running along the first end section 6 is a cup 9 , which rises between the side walls 4 , 5 .
  • the cup 9 provides support on a support element that is not shown.
  • each of the side walls 4 , 5 has a bore 10 serving to support a cam roller that is not shown.
  • the cam roller that is not shown defines a cam pickup surface.
  • a recess 11 designed with a rectangular outer contour is provided in the part of the floor 3 running along the section 7 near the center.
  • a contact surface 12 for a valve stem end, not shown, of a gas exchange valve is provided on the part of the floor 3 running along the second end section 8 of the lever body 2 .
  • a crossbar 13 that is provided between the side walls 4 , 5 extends between the second end section 8 and the section 7 near the center.
  • the crossbar 13 has a stamping 14 , which is implemented as a cylindrical molding, on the side facing away from the section 7 near the center. The stamping 14 makes it possible for adequate clearance of the contact surface relative to the gas exchange valve, not shown, to be present during pivoting motions of the rocker arm 1 .
  • FIG. 3 shows a longitudinal cross-section through the rocker arm 1 according to the invention. This illustrates the relationship of the individual sections to one another.
  • the cup 9 In the first end section 6 , the cup 9 has a longitudinal center 15 .
  • Each of the bores 10 has a center point 16 that defines a center of rotation 17 for the cam pickup surface.
  • the contact surface 12 defines a contact region 18 of the gas exchange valve, not shown.
  • a distance L 1 is defined between the longitudinal center 15 of the cup 9 and the center of rotation 17 of the cam pickup surface.
  • a distance L 2 is defined between the longitudinal center 15 of the cup 9 and a center of the contact region 18 of the gas exchange valve.
  • the distance L 1 here is half as large as or less than half the distance L 2 . This distance ratio makes possible a short, compact lever body 2 .

Landscapes

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

Abstract

Rocker arm for actuating at least one gas exchange valve of an internal combustion engine having an elongated lever body (2) with a floor (3) and with side walls (4,5) angled away therefrom, wherein a first end section (6) of the lever body (2) has a cup (9) for a support element formed in the floor (3), and in that a section (7) near the center is provided with a cam engagement surface and in that a second end section (8) of the lever body (2) has a contact surface (12) for a valve stem end of the gas exchange valve, wherein a crossbar (13) extends between the section (7) near the center and the second end section (8), wherein the crossbar (13) has a stamping 14) that is provided on the side facing away from the section (7) near the center.

Description

    FIELD OF THE INVENTION
  • The invention concerns a rocker arm for actuating a gas exchange valve of an internal combustion engine.
    • BACKGROUND OF THE INVENTION
  • In internal combustion engines, rocker arms are located in a valve train as transmission elements between cams and the gas exchange valves to be actuated. Rocker arms consist of a lever body that is supported at one of its ends on a support element and with its other end engages, through a contact surface, the gas exchange valve to be opened. In a section of the lever body near the center, a cam pickup surface is provided on which a cam of a camshaft runs during operation of an internal combustion engine, causing a pivoting motion of the rocker arm. The cam pickup surface can be implemented as a sliding surface or as a cam roller.
  • A rocker arm for actuating a gas exchange valve of an internal combustion engine is known from DE 10 2008 029,333 A1. At one end, the rocker arm has an oval opening that encompasses a valve stem end of the gas exchange valve. In addition, the rocker arm provides a cam roller in a section near the center.
  • WO2011/157499 A1 discloses a rocker arm that has a cam roller supported on an axle pin by means of a needle roller and cage assembly. A contact surface for a valve stem end of the gas exchange valve is provided at one end of the rocker arm. Side bars are provided in the region of the contact surface to guide the rocker arm on the valve stem end.
    • SUMMARY OF THE INVENTION
  • The object of the present invention is to provide a rocker arm that can be manufactured economically and that ensures adequate stiffness.
  • According to the invention this object is attained by a rocker arm for actuating at least one gas exchange valve of an internal combustion engine having an elongated lever body with a floor and with side walls angled away therefrom, wherein a first end section of the lever body has a cup for a support element formed in the floor, and in that a section near the center is provided with a cam engagement surface and in that a second end section of the lever body has a contact surface for a valve stem end of the gas exchange valve, wherein a crossbar extends between the section near the center and the second end section and wherein the crossbar has a stamping that is provided on the side facing away from the section near the center.
  • In the rocker arm according to the invention, the crossbar is provided with a stamping. The stamping can be an embossing, for example. The stamping in the crossbar makes it possible to avoid contact between the valve stem end and the lever body during pivoting motions of the rocker arm. The necessary stiffening of the rocker arm is ensured by the crossbar, which in turn results in increased strength of the rocker arm.
  • In a preferred embodiment of the invention, the shape of the stamping is matched to the valve stem end. This means that the shape of the stamping is designed to be complementary to the shape of the valve stem end. Preferably the stamping is implemented as a cylindrical molding.
  • Preferably the second end section of the lever body has a W-shaped profile when viewed in cross-section. As a result of the W-shaped profile, the side bars known from the prior art that would be necessary for valve guidance are eliminated. This has the advantage that the weight of material used can be reduced, and thus the production costs can be decreased. The W-shaped profile preferably is open in the direction facing away from the gas exchange valve. However, a reversed arrangement of the W-shaped profile is also possible.
  • In another embodiment of the invention, a distance between a longitudinal center of the cup and a center of rotation of the cam pickup surface is half as large as or less than half a distance between the longitudinal center of the cup and a center of a contact region of the gas exchange valve at the contact surface. Accordingly, the cam pickup surface can be positioned close to the contact region of the gas exchange valve. This has the advantage that the overall length of the rocker arm can be shortened to achieve a compact component.
  • In one embodiment, the cam pickup surface is implemented by a cam roller, and the section near the center has a recess in the floor that serves to accommodate the cam roller. The recess in the floor creates the necessary free space for the cam roller so that rotary motion of the cam roller is possible.
  • Preferably, the lever body is either produced by stamping and forming techniques from a sheet metal material, or by extrusion molding. However, other materials and manufacturing methods are also possible.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • An exemplary embodiment of the invention is explained below using three figures.
  • They show:
  • FIG. 1 a rocker arm according to the invention in a perspective view,
  • FIG. 2 a bottom view of the rocker arm according to the invention, and
  • FIG. 3 a longitudinal cross-section through the rocker arm according to the invention.
    •  DETAILED DESCRIPTION OF THE DRAWINGS
  • FIGS. 1 and 2 each show different views of a rocker arm 1 according to the invention. The rocker arm 1 has an elongated lever body 2, which has a floor 3 and side walls 4, 5 angled away therefrom. The floor 3 and the side walls 4, 5 form a W-shaped profile when viewed in cross-section. Moreover, the lever body 2, which is made of a sheet metal material, is divided into a first end section 6, a section 7 near the center, and a second end section 8.
  • Formed in the part of the floor 3 running along the first end section 6 is a cup 9, which rises between the side walls 4, 5. The cup 9 provides support on a support element that is not shown.
  • In the region of the section 7 near the center, each of the side walls 4,5 has a bore 10 serving to support a cam roller that is not shown. The cam roller that is not shown defines a cam pickup surface. A recess 11 designed with a rectangular outer contour is provided in the part of the floor 3 running along the section 7 near the center.
  • A contact surface 12 for a valve stem end, not shown, of a gas exchange valve is provided on the part of the floor 3 running along the second end section 8 of the lever body 2. A crossbar 13 that is provided between the side walls 4,5 extends between the second end section 8 and the section 7 near the center. The crossbar 13 has a stamping 14, which is implemented as a cylindrical molding, on the side facing away from the section 7 near the center. The stamping 14 makes it possible for adequate clearance of the contact surface relative to the gas exchange valve, not shown, to be present during pivoting motions of the rocker arm 1.
  • FIG. 3 shows a longitudinal cross-section through the rocker arm 1 according to the invention. This illustrates the relationship of the individual sections to one another. In the first end section 6, the cup 9 has a longitudinal center 15. Each of the bores 10 has a center point 16 that defines a center of rotation 17 for the cam pickup surface. The contact surface 12 defines a contact region 18 of the gas exchange valve, not shown.
  • A distance L1 is defined between the longitudinal center 15 of the cup 9 and the center of rotation 17 of the cam pickup surface. A distance L2 is defined between the longitudinal center 15 of the cup 9 and a center of the contact region 18 of the gas exchange valve. The distance L1 here is half as large as or less than half the distance L2. This distance ratio makes possible a short, compact lever body 2.
    • LIST OF REFERENCE CHARACTERS
    • 1 rocker arm
    • 2 lever body
    • 3 floor
    • 4 side wall
    • 5 side wall
    • 6 first end section
    • 7 section near the center
    • 8 second end section
    • 9 cup
    • 10 bore
    • 11 recess
    • 12 contact surface
    • 13 crossbar
    • 14 stamping
    • 15 longitudinal center of the cup
    • 16 center point
    • 17 center of rotation
    • 18 contact region of the gas exchange valve
    • L1 distance
    • L2 distance

Claims (6)

1. Rocker arm for actuating at least one gas exchange valve of an internal combustion engine having an elongated lever body (2) with a floor (3) and with side walls (4,5) angled away therefrom, wherein a first end section (6) of the lever body (2) has a cup (9) for a support element formed in the floor (3), and in that a section (7) near the center is provided with a cam engagement surface and in that a second end section (8) of the lever body (2) has a contact surface (12) for a valve stem end of the gas exchange valve, wherein a crossbar (13) extends between the section (7) near the center and the second end section (8), characterized in that the crossbar (13) has a stamping (14) that is provided on the side facing away from the section near the center (7).
2. Rocker arm according to claim 1, wherein a shape of the stamping (14) is matched to the valve stem end.
3. Rocker arm according to one of the preceding claims, wherein the second end section (8) of the lever body (2) has a W-shaped profile when viewed in cross-section.
4. Rocker arm according to one of the preceding claims, wherein a distance (L1) between a longitudinal center (15) of the cup (9) and a center of rotation (17) of the cam pickup surface is half as large as or less than half a distance (L2) between the longitudinal center (15) of the cup (9) and a center of a contact region (18) of the gas exchange valve at the contact surface (12).
5. Rocker arm according to one of the preceding claims, wherein the cam pickup surface is implemented by a cam roller, and wherein the section near the center has a recess (11) in the floor that serves to accommodate the cam roller.
6. Rocker arm according to one of the preceding claims, wherein the lever body (2) is either produced by stamping and forming techniques from a sheet metal material, or by extrusion molding.
US13/780,889 2012-02-29 2013-02-28 Rocker arm Abandoned US20130220254A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012203107A DE102012203107A1 (en) 2012-02-29 2012-02-29 cam follower
DE102012203107.3 2012-02-29

Publications (1)

Publication Number Publication Date
US20130220254A1 true US20130220254A1 (en) 2013-08-29

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ID=48950832

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Application Number Title Priority Date Filing Date
US13/780,889 Abandoned US20130220254A1 (en) 2012-02-29 2013-02-28 Rocker arm

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US (1) US20130220254A1 (en)
CN (1) CN103291395A (en)
DE (1) DE102012203107A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130263694A1 (en) * 2012-03-23 2013-10-10 Schaeffler Technologies AG & Co. KG Cam
US20170350281A1 (en) * 2014-12-26 2017-12-07 Otics Corporation Rocker arm and method of manufacturing the rocker arm

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251585A (en) * 1992-02-12 1993-10-12 Erich Neumayer Gmbh & Co. K.G. Two-armed lever
US5655490A (en) * 1992-01-07 1997-08-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Rocker arm with roller and a method for manufacturing the same
US5720245A (en) * 1995-11-13 1998-02-24 Sandco Automotive Limited Finger follower arm
US6932040B2 (en) * 2001-04-19 2005-08-23 Nsk Ltd. Metal plate rocker arm and method of manufacturing the metal plate rocker arm
DE102006052821A1 (en) * 2006-11-09 2008-05-15 Schaeffler Kg Drag lever for actuating a gas exchange valve of an internal combustion engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029333A1 (en) 2008-06-20 2009-12-24 Schaeffler Kg Gas exchange valves switching-off device for internal combustion engine, has valve shaft and/or retaining cover encompassing end of valve shaft, where valve shaft and/or retaining cover are passed and/or penetrated into oval opening
DE102010024196A1 (en) 2010-06-17 2011-12-22 Schaeffler Technologies Gmbh & Co. Kg Drag lever for a valve train of an internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5655490A (en) * 1992-01-07 1997-08-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Rocker arm with roller and a method for manufacturing the same
US5251585A (en) * 1992-02-12 1993-10-12 Erich Neumayer Gmbh & Co. K.G. Two-armed lever
US5720245A (en) * 1995-11-13 1998-02-24 Sandco Automotive Limited Finger follower arm
US6932040B2 (en) * 2001-04-19 2005-08-23 Nsk Ltd. Metal plate rocker arm and method of manufacturing the metal plate rocker arm
DE102006052821A1 (en) * 2006-11-09 2008-05-15 Schaeffler Kg Drag lever for actuating a gas exchange valve of an internal combustion engine
WO2008055785A1 (en) * 2006-11-09 2008-05-15 Schaeffler Kg Cam follower for actuating a gas exchange valve of an internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130263694A1 (en) * 2012-03-23 2013-10-10 Schaeffler Technologies AG & Co. KG Cam
US20170350281A1 (en) * 2014-12-26 2017-12-07 Otics Corporation Rocker arm and method of manufacturing the rocker arm
US10309263B2 (en) * 2014-12-26 2019-06-04 Otics Corporation Rocker arm and method of manufacturing the rocker arm

Also Published As

Publication number Publication date
CN103291395A (en) 2013-09-11
DE102012203107A1 (en) 2013-08-29

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AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WITTER, OLIVER;KRESS, MICHAEL;REEL/FRAME:030593/0645

Effective date: 20130326

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Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, GERMANY

Free format text: MERGER AND CHANGE OF NAME;ASSIGNORS:SCHAEFFLER TECHNOLOGIES AG & CO. KG;SCHAEFFLER VERWALTUNGS 5 GMBH;REEL/FRAME:037732/0228

Effective date: 20131231

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: CHANGE OF NAME;ASSIGNOR:SCHAEFFLER TECHNOLOGIES GMBH & CO. KG;REEL/FRAME:037732/0347

Effective date: 20150101

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258;ASSIGNOR:SCHAEFFLER TECHNOLOGIES GMBH & CO. KG;REEL/FRAME:040404/0530

Effective date: 20150101