US20170211429A1 - Lever for the valve actuation of an internal combustion engine - Google Patents

Lever for the valve actuation of an internal combustion engine Download PDF

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Publication number
US20170211429A1
US20170211429A1 US15/327,840 US201515327840A US2017211429A1 US 20170211429 A1 US20170211429 A1 US 20170211429A1 US 201515327840 A US201515327840 A US 201515327840A US 2017211429 A1 US2017211429 A1 US 2017211429A1
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US
United States
Prior art keywords
lever
valve
contact surface
sheet metal
rocker 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.)
Abandoned
Application number
US15/327,840
Inventor
Andreas Grotsch
Joachim Seitz
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: GROTSCH, ANDREAS, SEITZ, JOACHIM
Publication of US20170211429A1 publication Critical patent/US20170211429A1/en
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
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers

Definitions

  • the invention relates to a lever for the valve actuation of an internal combustion engine, which is supported so that it can pivot about an axis and has a contact surface for a valve stem end and a contact surface for a cam of a camshaft.
  • Such a lever is provided for use in engines for motorcycles. Such levers are typically used in motorcycle engines with more than two valves per cylinder, because then two camshafts are also provided for actuation.
  • a valve lash compensation device forms, on one longitudinal end of the lever, a contact surface for a valve stem end, while a contact surface for a cam is located on the other longitudinal end.
  • This contact surface is, however, formed by the outer circumferential surface of a roller, which requires a needle bearing for its rotatable arrangement.
  • the lever material is forged, sintered, or cast.
  • the invention is based on the object of providing an alternative to cast and forged swinging arms for the lever.
  • a lever is to be created that is equivalent to forged and cast levers in mass, stiffness, and inertia and that makes it possible to comply with the installation space necessary for previously known levers.
  • the lever is formed as a sheet metal rocker arm with an inverted U-shaped base body including a top section and two parallel side walls integral with this section, wherein the axis is arranged on one longitudinal end of the lever and a valve contact lug with the contact surface for the valve stem end is arranged on the other longitudinal end.
  • valve contact lug On the longitudinal end of the lever facing away from the axis, the valve contact lug can be arranged on the lever bottom side and a contact surface for a cam can be arranged on the lever top side.
  • This sheet metal solution thus provides a U-profile-shaped base body on which the two contact surfaces for the cam and for the valve stem end are arranged on one of the two longitudinal ends of the lever, while the axis is located on the other longitudinal end.
  • the contact surface for the valve stem end and the contact surface for the cam can be coated as sliding surfaces.
  • the lever area containing the contact surface for the cam can be constructed integrally with the top section of the base body and the top section can have a stiffening rib.
  • a simple production option of the lever is then given when the lever area that contains the valve contact lug with the contact surface for the valve stem end is constructed integrally with the top section, is bent toward the side walls, and is connected with a positive fit to these walls. If at least one recess is then arranged on the valve contact lug on each side pointing toward a side wall of the lever, the valve contact lug can be fixed with a positive fit on each side wall by a swaged section, wherein the material of the bottom section of a side wall is pressed into the recess of the valve contact lug.
  • FIG. 1 a sheet metal rocker arm in the not yet finished state with a formed valve contact lug in perspective view
  • FIG. 2 the sheet metal rocker arm according to FIG. 1 in a side view
  • FIG. 3 the sheet metal rocker arm in the finished state, the valve contact lug is bent toward its side walls, and is connected there to the lever with a positive fit in perspective view,
  • FIG. 4 another perspective view of the sheet metal rocker arm according to FIG. 3 .
  • FIG. 5 an end view of the sheet metal rocker arm according to FIG. 3 .
  • FIG. 6 the sheet metal rocker arm according to FIG. 3 in a bottom view
  • FIG. 7 the sheet metal rocker arm according to FIG. 3 in a side view
  • FIG. 8 the sheet metal rocker arm according to FIG. 3 in a top view.
  • a lever according to the invention is constructed as a sheet metal rocker arm 1 with a deep-drawn base body made from sheet metal which has been shaped during the deep drawing process into an inverted U-shape.
  • the base body contains a top section 2 that attaches to two parallel side walls, namely, according to the drawing, a front side wall 3 with a bottom section 4 and a rear side wall 5 with a bottom section 6 .
  • the sheet metal rocker arm 1 has, on its one longitudinal end on the top side, a contact surface 7 for a cam of a not-shown camshaft. On this longitudinal end there is, on the bottom side of the lever 1 , a contact surface 8 for a valve stem end of a not-shown motor valve. On the other longitudinal end of the lever 1 there is the rocker arm axis 9 for which aligned holes 10 and 11 are punched out from the sheet metal from the side walls 3 and 5 .
  • the contact surface 8 for the valve stem end is located on a valve contact lug 12 that is constructed integrally with the base body and is also punched out from the sheet metal.
  • the valve contact lug 12 has recesses 13 on its sides adjacent to the side walls 3 and 5 . It is bent according to the required contours of the curvature of the contact surface 8 in the valve contact and the contact surface 7 in cam contact on the base body, as FIGS. 3 to 8 show.
  • FIGS. 1 and 2 a shaping stage of the sheet metal rocker arm 1 is shown in which the valve contact lug 12 is not yet completely bent, so that the recesses 13 of the valve contact lug 12 can be identified.
  • valve contact lug 12 After the valve contact lug 12 has been bent over so that it contacts with its bottom side on the bottom sections 4 and 6 of the side walls 3 and 5 , material is pressed out from the bottom sections 4 and 6 into the recesses 13 of the valve contact lug 12 with a swaging tool, so that the valve contact lug 12 is connected in an undetachable manner on each side with a positive fit with each side wall 3 and 5 of the sheet metal rocker arm 1 due to these swaged sections 14 .

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

Abstract

A lever for the valve actuation of an internal combustion engine, which is mounted such that it can pivot about an axis and has a contact surface for a valve stem end and a contact surface for a cam of a camshaft, is formed as a sheet metal rocker lever having an inverse U-shaped base including a top section and two parallel side walls integral thereto, wherein the axis is arranged at one longitudinal end of the lever, and a valve contact lug having the contact surface for the valve stem end is arranged at the other longitudinal end.

Description

    FIELD OF THE INVENTION
  • The invention relates to a lever for the valve actuation of an internal combustion engine, which is supported so that it can pivot about an axis and has a contact surface for a valve stem end and a contact surface for a cam of a camshaft.
  • Such a lever is provided for use in engines for motorcycles. Such levers are typically used in motorcycle engines with more than two valves per cylinder, because then two camshafts are also provided for actuation.
  • From publication DE 42 34 868 C2, a rocker arm that is supported so that it can pivot about an axis in a cylinder head not shown in more detail is known for a valve train in addition to a cam follower. The axis is located there in the middle area of the lever. A valve lash compensation device forms, on one longitudinal end of the lever, a contact surface for a valve stem end, while a contact surface for a cam is located on the other longitudinal end. This contact surface is, however, formed by the outer circumferential surface of a roller, which requires a needle bearing for its rotatable arrangement.
  • In previous production methods for pivot arms that can be used in valve trains of motorcycle engines, the lever material is forged, sintered, or cast.
    • BACKGROUND
  • The invention is based on the object of providing an alternative to cast and forged swinging arms for the lever. Through the use of shaping and assembly techniques, a lever is to be created that is equivalent to forged and cast levers in mass, stiffness, and inertia and that makes it possible to comply with the installation space necessary for previously known levers.
    • SUMMARY
  • This objective is achieved according to the invention in that the lever is formed as a sheet metal rocker arm with an inverted U-shaped base body including a top section and two parallel side walls integral with this section, wherein the axis is arranged on one longitudinal end of the lever and a valve contact lug with the contact surface for the valve stem end is arranged on the other longitudinal end.
  • On the longitudinal end of the lever facing away from the axis, the valve contact lug can be arranged on the lever bottom side and a contact surface for a cam can be arranged on the lever top side.
  • This sheet metal solution thus provides a U-profile-shaped base body on which the two contact surfaces for the cam and for the valve stem end are arranged on one of the two longitudinal ends of the lever, while the axis is located on the other longitudinal end.
  • The contact surface for the valve stem end and the contact surface for the cam can be coated as sliding surfaces. The lever area containing the contact surface for the cam can be constructed integrally with the top section of the base body and the top section can have a stiffening rib.
  • A simple production option of the lever is then given when the lever area that contains the valve contact lug with the contact surface for the valve stem end is constructed integrally with the top section, is bent toward the side walls, and is connected with a positive fit to these walls. If at least one recess is then arranged on the valve contact lug on each side pointing toward a side wall of the lever, the valve contact lug can be fixed with a positive fit on each side wall by a swaged section, wherein the material of the bottom section of a side wall is pressed into the recess of the valve contact lug.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • An embodiment of the invention is shown in the drawing and is described in more detail below. Shown are:
  • FIG. 1 a sheet metal rocker arm in the not yet finished state with a formed valve contact lug in perspective view,
  • FIG. 2 the sheet metal rocker arm according to FIG. 1 in a side view,
  • FIG. 3 the sheet metal rocker arm in the finished state, the valve contact lug is bent toward its side walls, and is connected there to the lever with a positive fit in perspective view,
  • FIG. 4 another perspective view of the sheet metal rocker arm according to FIG. 3,
  • FIG. 5 an end view of the sheet metal rocker arm according to FIG. 3,
  • FIG. 6 the sheet metal rocker arm according to FIG. 3 in a bottom view,
  • FIG. 7 the sheet metal rocker arm according to FIG. 3 in a side view,
  • FIG. 8 the sheet metal rocker arm according to FIG. 3 in a top view.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • A lever according to the invention is constructed as a sheet metal rocker arm 1 with a deep-drawn base body made from sheet metal which has been shaped during the deep drawing process into an inverted U-shape. The base body contains a top section 2 that attaches to two parallel side walls, namely, according to the drawing, a front side wall 3 with a bottom section 4 and a rear side wall 5 with a bottom section 6.
  • The sheet metal rocker arm 1 has, on its one longitudinal end on the top side, a contact surface 7 for a cam of a not-shown camshaft. On this longitudinal end there is, on the bottom side of the lever 1, a contact surface 8 for a valve stem end of a not-shown motor valve. On the other longitudinal end of the lever 1 there is the rocker arm axis 9 for which aligned holes 10 and 11 are punched out from the sheet metal from the side walls 3 and 5.
  • The contact surface 8 for the valve stem end is located on a valve contact lug 12 that is constructed integrally with the base body and is also punched out from the sheet metal. The valve contact lug 12 has recesses 13 on its sides adjacent to the side walls 3 and 5. It is bent according to the required contours of the curvature of the contact surface 8 in the valve contact and the contact surface 7 in cam contact on the base body, as FIGS. 3 to 8 show. In FIGS. 1 and 2, a shaping stage of the sheet metal rocker arm 1 is shown in which the valve contact lug 12 is not yet completely bent, so that the recesses 13 of the valve contact lug 12 can be identified.
  • After the valve contact lug 12 has been bent over so that it contacts with its bottom side on the bottom sections 4 and 6 of the side walls 3 and 5, material is pressed out from the bottom sections 4 and 6 into the recesses 13 of the valve contact lug 12 with a swaging tool, so that the valve contact lug 12 is connected in an undetachable manner on each side with a positive fit with each side wall 3 and 5 of the sheet metal rocker arm 1 due to these swaged sections 14.
    • LIST OF REFERENCE NUMBERS
    • 1 Sheet metal rocker arm
    • 2 Top section
    • 3 Front side wall
    • 4 Bottom section
    • 5 Rear side wall
    • 6 Bottom section
    • 7 Contact surface for a cam
    • 8 Contact surface for a valve stem end
    • 9 Axis
    • 10 Hole
    • 11 Hole
    • 12 Valve contact lug
    • 13 Recess
    • 14 Swaged section

Claims (8)

1. A lever for the valve actuation of an internal combustion engine, which is supported to pivot about an axis and having a contact surface for a valve stem end and a contact surface for a cam of a camshaft, the lever comprising a sheet metal rocker arm with an inverted U-shaped base body including a top section and two parallel side walls formed integrally with the top section, the axis is arranged at one longitudinal end of the lever, and on another longitudinal end, a valve contact lug with the contact surface for the valve stem end is arranged.
2. The sheet metal rocker arm according to claim 1, wherein the valve contact lug is arranged on a bottom side on the longitudinal end facing away from the axis and a contact surface for a cam is arranged on a top side of the lever.
3. The sheet metal rocker arm according to claim 2, wherein the contact surface for the valve stem end and the contact surface for the cam are coated as sliding surfaces.
4. The sheet metal rocker arm according to claim 2, wherein the lever area containing the contact surface for the cam is constructed integrally with the top section.
5. The sheet metal rocker arm according to claim 4, wherein the top section has a stiffening rib.
6. The sheet metal rocker arm according to claim 2, wherein the lever area that contains the valve contact lug with the contact surface for the valve stem end, is constructed integrally with the top section, is bent toward the side walls, and is connected with a positive fit to said side walls.
7. The sheet metal rocker arm according to claim 6, wherein at least one recess is arranged on each side of the valve contact lug pointing respectively toward one of the side walls of the lever.
8. The sheet metal rocker arm according to claim 7, wherein the valve contact lug is fixed with a positive fit on each of the side walls by a swaged section, and material of bottom sections of each of said side walls is pressed into the recesses of the valve contact lug.
US15/327,840 2014-08-01 2015-06-02 Lever for the valve actuation of an internal combustion engine Abandoned US20170211429A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014215129.5 2014-08-01
DE102014215129.5A DE102014215129A1 (en) 2014-08-01 2014-08-01 Lever for the valve actuation of an internal combustion engine
PCT/DE2015/200334 WO2016015722A1 (en) 2014-08-01 2015-06-02 Lever for the valve actuation of an internal combustion engine

Publications (1)

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US20170211429A1 true US20170211429A1 (en) 2017-07-27

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DE (1) DE102014215129A1 (en)
WO (1) WO2016015722A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020111773A1 (en) 2020-04-30 2021-11-04 Schaeffler Technologies AG & Co. KG Lever for a valve train of an internal combustion engine
DE102020111775A1 (en) 2020-04-30 2021-11-04 Schaeffler Technologies AG & Co. KG Lever for a valve train of an internal combustion engine

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002507A (en) * 1959-02-03 1961-10-03 Daimler Benz Ag Valve control mechanism for internal combustion engines
US4369740A (en) * 1976-12-01 1983-01-25 Bayerische Motoren Werke A.G. Valve-actuating lever
US5010857A (en) * 1990-08-15 1991-04-30 Ni Industries, Inc. Rocker arm
US5655490A (en) * 1992-01-07 1997-08-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Rocker arm with roller and a method for manufacturing the same
US6253636B1 (en) * 1996-11-07 2001-07-03 Ina Walzlager Schaeffler Ohg Finger lever shaped without cutting
US7185618B1 (en) * 2006-01-12 2007-03-06 Gentek Technologies Marketing Inc. Sheet metal rocker arm with integrally formed cross member
US20070271985A1 (en) * 2004-08-26 2007-11-29 Gentek Technologies Marketing Inc. Method for Forming a Cam-Engaged Rocker Arm
US20100018485A1 (en) * 2008-07-25 2010-01-28 Schaeffler Kg Cam follower for a valve drive of an internal combustion engine
US20100307437A1 (en) * 2009-06-05 2010-12-09 Schaeffler Technologies Gmbh & Co. Kg Rocker arm for a valve train of an internal combustion engine
US20120024248A1 (en) * 2010-08-02 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Drag lever
US20120097123A1 (en) * 2009-07-10 2012-04-26 Schaeffler Technologies Gmbh & Co. Kg Finger lever
US20120325168A1 (en) * 2010-03-18 2012-12-27 Schaeffler Technologies AG & Co. KG Switchable lever for a valve drive of an internal combustion engine
US20130263694A1 (en) * 2012-03-23 2013-10-10 Schaeffler Technologies AG & Co. KG Cam
US20140366826A1 (en) * 2013-06-18 2014-12-18 GT Technologies Retention device for valve actuating mechanism
US20150377083A1 (en) * 2013-02-04 2015-12-31 Mechadyne International Limited Cam profile summation mechanism

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1183465A (en) * 1966-05-07 1970-03-04 Mitsuya Seiko Kabushiki Kaisha Valve Rocker Arm for Internal Combustion Engine
DE4234868C2 (en) 1992-10-16 1999-10-28 Schaeffler Waelzlager Ohg Process for the production of a rocker arm or rocker arm
DE4310735C1 (en) * 1993-04-01 1994-05-26 Audi Ag IC engine valve operating drive - has longitudinal lubrication channel and lubrication bores incorporated in camshaft for lubricating lever arm cam contact surfaces
IT1302601B1 (en) * 1998-10-05 2000-09-29 Eaton Automotive Spa ROCKER EQUIPPED WITH HYDRAULIC ELEMENT IN THE BELL FOR A VALVE VALVE TRAIN.
JP2003222005A (en) * 2001-11-22 2003-08-08 Ntn Corp Rocker arm

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002507A (en) * 1959-02-03 1961-10-03 Daimler Benz Ag Valve control mechanism for internal combustion engines
US4369740A (en) * 1976-12-01 1983-01-25 Bayerische Motoren Werke A.G. Valve-actuating lever
US5010857A (en) * 1990-08-15 1991-04-30 Ni Industries, Inc. Rocker arm
US5655490A (en) * 1992-01-07 1997-08-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Rocker arm with roller and a method for manufacturing the same
US6253636B1 (en) * 1996-11-07 2001-07-03 Ina Walzlager Schaeffler Ohg Finger lever shaped without cutting
US20070271985A1 (en) * 2004-08-26 2007-11-29 Gentek Technologies Marketing Inc. Method for Forming a Cam-Engaged Rocker Arm
US7185618B1 (en) * 2006-01-12 2007-03-06 Gentek Technologies Marketing Inc. Sheet metal rocker arm with integrally formed cross member
US20100018485A1 (en) * 2008-07-25 2010-01-28 Schaeffler Kg Cam follower for a valve drive of an internal combustion engine
US20100307437A1 (en) * 2009-06-05 2010-12-09 Schaeffler Technologies Gmbh & Co. Kg Rocker arm for a valve train of an internal combustion engine
US20120097123A1 (en) * 2009-07-10 2012-04-26 Schaeffler Technologies Gmbh & Co. Kg Finger lever
US20120325168A1 (en) * 2010-03-18 2012-12-27 Schaeffler Technologies AG & Co. KG Switchable lever for a valve drive of an internal combustion engine
US20120024248A1 (en) * 2010-08-02 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Drag lever
US20130263694A1 (en) * 2012-03-23 2013-10-10 Schaeffler Technologies AG & Co. KG Cam
US20150377083A1 (en) * 2013-02-04 2015-12-31 Mechadyne International Limited Cam profile summation mechanism
US20140366826A1 (en) * 2013-06-18 2014-12-18 GT Technologies Retention device for valve actuating mechanism

Also Published As

Publication number Publication date
WO2016015722A1 (en) 2016-02-04
DE102014215129A1 (en) 2016-02-04

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AS Assignment

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

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GROTSCH, ANDREAS;SEITZ, JOACHIM;SIGNING DATES FROM 20161109 TO 20161116;REEL/FRAME:041027/0298

STCB Information on status: application discontinuation

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