EP1036256A1 - Valve operating lever - Google Patents
Valve operating leverInfo
- Publication number
- EP1036256A1 EP1036256A1 EP98965707A EP98965707A EP1036256A1 EP 1036256 A1 EP1036256 A1 EP 1036256A1 EP 98965707 A EP98965707 A EP 98965707A EP 98965707 A EP98965707 A EP 98965707A EP 1036256 A1 EP1036256 A1 EP 1036256A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- symmetry
- tabs
- valve
- plane
- base body
- 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.)
- Granted
Links
- 230000007704 transition Effects 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000004080 punching Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000001154 acute effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- F01L2303/00—Manufacturing of components used in valve arrangements
-
- 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
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49295—Push rod or rocker arm making
-
- 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
- the present invention relates to a valve actuation lever for transmitting the movement of a cam arranged on a camshaft to a gas exchange valve of an internal combustion engine.
- a roller rocker arm of the type in question has become known from DE 195 43 657 A1.
- the known valve actuation lever has a U-shaped base body, at one end of which a pan-like depression is provided, with which the lever is supported in the installed state via a support element on the cylinder head. At the other end, the valve contact area is provided, through which the gas exchange valve of the internal combustion engine is actuated depending on the position of the cam of the camshaft.
- the cam is in contact with the valve actuation lever in a cam contact area, a roller which is rotatably supported by roller elements being arranged in this cam contact area in the case of a roller cam follower.
- the base body of the valve actuation lever is formed without cutting and has, at the end at which the valve contact area is provided, inwardly bent tabs which form lateral boundary surfaces.
- valve actuation lever fulfills its function very satisfactorily, there is nevertheless a need to further increase the technical functionality by reducing the weight and therefore the moment of inertia of the lever about its axis of rotation without impairing the rigidity. There is also a desire to further reduce manufacturing costs.
- the present invention is therefore based on the object of providing a valve actuation lever and in particular a roller finger follower and a method for its production, in which the moment of inertia of the lever is reduced about the axis of rotation.
- Another aspect of this task is to design the valve actuation lever in such a way that the rigidity is increased compared to the prior art and low manufacturing costs can be achieved.
- the valve actuation lever according to the invention has an essentially non-cutting elongated base body, preferably with a U-shaped profile.
- the base body is designed essentially symmetrically to a longitudinal plane of symmetry extending in its longitudinal direction.
- tabs are arranged in the valve contact area, each of which has a side surface facing the plane of longitudinal symmetry. The tabs are formed on an end edge of this base body and bent towards the valve contact area.
- At least one of these tabs has a transition area extending from this plane of longitudinal symmetry, in which the distance between these sen side surfaces enlarged and at least one parallel area in which these side surfaces run substantially parallel to this longitudinal plane of symmetry.
- the two tabs are arranged with a clear distance at the end edge of the base body that is less than the clear distance between the side surfaces in the parallel area, this distance being determined in each case in a direction perpendicular to the plane of longitudinal symmetry.
- the design according to the invention has a number of essential advantages.
- the distance between the tabs at the end edge of the elongated base body is a structural size that determines the width of the elongated base body in the valve contact area. By reducing this distance, the width of the elongated base body is reduced at least in the valve contact area and thereby also its weight. Since the valve contact area is radially spaced from the axis of rotation of the actuating lever, this results in a substantial reduction in the moment of inertia about the axis of rotation of the lever. This reduces the forces required to operate the lever at the same speed, and increases the speed limit permitted for the valve train with regard to the operating forces.
- the material expenditure is reduced by reducing the lever width, as a result of which the production costs are reduced.
- the non-cutting shape, in which the tabs are also produced by a simple stamping and bending process has considerable cost advantages anyway.
- valve train can be made narrower overall. Since the engine designers are forced to develop engines with the shortest possible overall length due to the demands placed on space economy and weight optimization, this is not only particularly so important if three or more valves per cylinder are to be used based on the specifications for power, consumption and exhaust gas values.
- the tabs are integrally formed on the base body before the bending process in such a way that they extend parallel to the longitudinal plane of symmetry, i. H. run straight.
- the bending then takes place in such a way that one or both tabs are bent away from the longitudinal plane of symmetry to form the transition region.
- the tabs are then bent in such a way that the inner side surface of the tab facing the plane of symmetry runs parallel to the latter.
- the tabs are punched in such a way that the transition area and the parallel area are already present in the non-deformed tabs.
- the tabs then only have to be bent through 180 ° and then have the desired contour in the valve contact area in the bent state, without any further bending process.
- the first and the second embodiment can also be combined with one another.
- the tabs are brought into an initial shape by a punching process and then by a bend through 180 ° and an additional bend to the longitudinal plane of symmetry or away from it into the final shape.
- the initial shape of the tabs can be the same, for example correspond to the shape of an elongated cuboid with longitudinal edges running parallel to the longitudinal plane of symmetry, or different from one another.
- Figure 1 is a bottom view of a first embodiment of the invention, which is designed as a roller rocker arm;
- Figure 2 shows a longitudinal section of the embodiment of FIG. 1;
- Figure 3 is a section through the representation of Figure 2 seen along the lines III-III;
- Figure 4 is a plan view of the embodiment of FIG. 1;
- Figure 5 is a view of the roller finger follower of the embodiment according to
- Figure 6 is a representation corresponding to FIG. 5 in a further stage of
- Figure 7 shows a second embodiment of the roller finger follower according to the invention in a previous stage of manufacture, seen from below;
- Figure 8 seen the roller rocker arm according to Figure 7 in a view from below.
- FIGS. 1 to 6 A first embodiment of the invention will now be described with reference to FIGS. 1 to 6.
- Fig. 1 shows a first embodiment of the roller finger follower according to the invention.
- the roller rocker arm has a base body, generally designated 1, which is essentially symmetrical along a longitudinal plane of symmetry 2. stretches.
- the term plane of symmetry is not to be understood here in a purely geometrical sense, but merely means that essential areas of the valve actuation lever are designed symmetrically to this plane of symmetry.
- the plane of symmetry 2 runs perpendicular to the drawing plane in the illustration according to FIG. 1 and forms the sectional plane in the illustration according to FIG. 2.
- the elongated base body is essentially U-shaped and has a recess 4 which extends symmetrically to the plane of symmetry 2 and in which a roller 7 mounted over rolling elements 6 is arranged. When installed, the roller 7 is in contact with the cam of a camshaft.
- a depression 10 is provided for receiving a support element (not shown). In the installed state, this element in turn is supported within the cylinder head (not shown).
- This recess 10 is known in the prior art and therefore need not be discussed further here.
- a valve contact area 20 is provided on the left side of the base body in the illustration according to FIG. 1.
- the valve contact area has a surface 21 which is slightly convex in the exemplary embodiment, but can also have other shapes of curvature or be flat.
- valve contact area is delimited by two lateral surfaces 23, 24 facing the longitudinal plane of symmetry 2, which are part of the tabs 25, 26.
- the tabs 25, 26 are formed on an end edge 30 of the elongated base body 1, the end edge 30 being essentially perpendicular to the plane of symmetry 2.
- the distance between the tabs 25 and 26 at this end edge of the base body corresponds to the length a in FIG. 5 between the arrows 31 and 32 or, in other words, the tabs 25 and 26 are at the end edge 30 of a web 30a which has the width c ( see Fig. 5) between the arrows 33 and 34, integrally formed.
- both tabs 25, 26 have a transition region 35, 36, in which the tabs move away from the plane of symmetry 2 extend.
- a parallel area 37, 38 adjoins this transition area 35, 36, in which both tabs run parallel to the plane of symmetry 2.
- this is followed by a narrowing region 40 in which the tab again runs towards the plane of symmetry 2.
- transition region is consequently defined by the fact that the angular orientation of the tab or of the side surfaces changes with respect to the longitudinal plane of symmetry.
- the distance between the two tabs corresponds to the distance b, as shown between the arrows 42, 43.
- This distance b is greater than the distance a.
- the difference between the two sections essentially corresponds to the width saving of the base body compared to the prior art discussed at the beginning.
- the two tabs 25, 26 are flush, as shown in particular by the illustration according to FIG. H. without space, on the curved surface of the valve contact area 20.
- the tabs in this embodiment and also in the next embodiment can be designed such that a gap is provided between the tabs and the surface of the valve contact area, the tabs then being shaped such that their end area rests on the valve contact area.
- an additional connection is made at the end, preferably by means of a welding point.
- the roller rocker arm shown in the exemplary embodiment is punched out of a metal sheet as a whole and then preferably cold-formed in order to achieve the final design shown in FIGS. 1 to 4.
- the tabs 25 and 26 are at Punching is designed as an essentially straight extension of the base body 1. Subsequently, as shown in FIG. 6, they are formed downward (seen in the illustration of the drawing), the distance between the tabs still corresponding to the distance a. The tabs are then bent away from the plane of symmetry 2 to form the transition region 35, 36.
- This bending process is carried out in such a way that the tabs are initially bent outward at a first bending angle, so that the first part of the transition region 35, 36 which extends outward from the plane of symmetry 2 is formed, and that the tabs then follow in the direction of the plane of symmetry 2 are bent back so that the further part of the tabs runs parallel to the line of symmetry 2. Only one or both ends of the tabs, as indicated by 40 in FIG. 1, is again shaped with an inward bending angle on the plane of symmetry 2.
- this design makes it possible to design the valve actuation lever with a small width. This saves a considerable amount of material, which reduces the moment of inertia about the axis of rotation and increases the stiffness while maintaining the same dimensions.
- the end product shown essentially in FIG. 8 namely the roller finger follower, essentially corresponds to the illustration according to FIG. 1. Corresponding reference numerals are therefore also used there.
- the tabs are formed directly during a punching process in such a way that the desired transition area already results during the punching process and not, as in the exemplary embodiment according to FIGS. 1 to 6, during bending.
- the tab 51 is formed on the end edge 30 of the base body 1, which is essentially perpendicular to the plane of symmetry 2.
- the tab 51 has a first area, in which the tab, even in the undeformed state, is designated 53. Neth forms an acute angle to this end edge 30, which forms a transition region 54 pointing away from the longitudinal plane of symmetry 2.
- the transition region 54 is followed by a parallel region 55, which is designed parallel to the plane of longitudinal symmetry, followed by a region 56, in which the side surface is directed at an acute angle to the plane of longitudinal symmetry.
- a parallel region 57 is initially provided, which runs parallel to the longitudinal symmetry plane 2, to which the transition region 58 then adjoins, in which the tab extends away from the longitudinal symmetry plane 2.
- a further parallel region 59 which runs parallel to the longitudinal symmetry plane 2 and which forms the side surface 60.
- the method for producing this valve actuation lever is designed similarly to that in the exemplary embodiment described above.
- the tabs are bent by approximately 180 °, which results in a design of the rocker arm according to FIG. 8.
- the bend directed towards or away from the longitudinal symmetry plane is omitted here.
- the punching tool is designed somewhat more complex than in the exemplary embodiment according to FIGS. 1 to 6. However, this is offset by the advantage that the bending process is easier.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19753424 | 1997-12-02 | ||
DE19753424A DE19753424A1 (en) | 1997-12-02 | 1997-12-02 | Valve actuation lever |
PCT/EP1998/007674 WO1999028600A1 (en) | 1997-12-02 | 1998-11-27 | Valve operating lever |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1036256A1 true EP1036256A1 (en) | 2000-09-20 |
EP1036256B1 EP1036256B1 (en) | 2002-04-03 |
Family
ID=7850497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98965707A Expired - Lifetime EP1036256B1 (en) | 1997-12-02 | 1998-11-27 | Valve operating lever |
Country Status (5)
Country | Link |
---|---|
US (1) | US6273044B1 (en) |
EP (1) | EP1036256B1 (en) |
DE (2) | DE19753424A1 (en) |
ES (1) | ES2174539T3 (en) |
WO (1) | WO1999028600A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2228241A1 (en) * | 2003-02-20 | 2005-04-01 | Tratasa 2000, S.L. | Fabrication of water filter involves extrusion of homogenized PVDF and titanium dioxide-based filter element |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6470842B2 (en) * | 2000-10-12 | 2002-10-29 | Ina Walzlager Schaeffler Ohg | Lever-type cam follower |
US20100018276A1 (en) * | 2008-07-28 | 2010-01-28 | Edelmayer Thomas C | Sheet metal rocker arm with integrally formed cross member |
DE102011006694A1 (en) * | 2010-04-15 | 2011-10-20 | Schaeffler Technologies Gmbh & Co. Kg | Assembly for a gas exchange valve drive of an internal combustion engine |
DE102011076727A1 (en) | 2011-05-30 | 2012-12-06 | Schaeffler Technologies AG & Co. KG | Rocker arm i.e. roller rocker arm, for variable valve train of combustion piston engine, has bars designed in stepped manner at inner walls, where distance between walls in inner region is less than that between walls in outer region |
JP6769691B2 (en) * | 2014-12-26 | 2020-10-14 | 株式会社オティックス | Rocker arm manufacturing method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5016582A (en) * | 1990-10-12 | 1991-05-21 | Henley Manufacturing Holding Company, Inc. | Rocker arm |
KR960014920B1 (en) | 1992-01-07 | 1996-10-21 | 나까무라 유이찌 | Roller rocker arm & process for manufacturing the same |
DE19543657C2 (en) | 1995-11-23 | 1998-07-02 | Schaeffler Waelzlager Ohg | Chipless rocker arm or rocker arm |
DE19617668C2 (en) | 1995-11-23 | 2003-11-20 | Ina Schaeffler Kg | Chipless rocker arm or rocker arm |
DE19617523C2 (en) * | 1996-05-02 | 2001-11-08 | Schaeffler Waelzlager Ohg | Securing for operating lever of valve controls for internal combustion engines |
-
1997
- 1997-12-02 DE DE19753424A patent/DE19753424A1/en not_active Withdrawn
-
1998
- 1998-11-27 US US09/555,550 patent/US6273044B1/en not_active Expired - Lifetime
- 1998-11-27 DE DE59803669T patent/DE59803669D1/en not_active Expired - Lifetime
- 1998-11-27 ES ES98965707T patent/ES2174539T3/en not_active Expired - Lifetime
- 1998-11-27 EP EP98965707A patent/EP1036256B1/en not_active Expired - Lifetime
- 1998-11-27 WO PCT/EP1998/007674 patent/WO1999028600A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9928600A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2228241A1 (en) * | 2003-02-20 | 2005-04-01 | Tratasa 2000, S.L. | Fabrication of water filter involves extrusion of homogenized PVDF and titanium dioxide-based filter element |
Also Published As
Publication number | Publication date |
---|---|
WO1999028600A1 (en) | 1999-06-10 |
DE59803669D1 (en) | 2002-05-08 |
ES2174539T3 (en) | 2002-11-01 |
EP1036256B1 (en) | 2002-04-03 |
DE19753424A1 (en) | 1999-06-10 |
US6273044B1 (en) | 2001-08-14 |
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