EP2156021A1 - Rocker arm of an internal combustion engine - Google Patents
Rocker arm of an internal combustion engineInfo
- Publication number
- EP2156021A1 EP2156021A1 EP08736306A EP08736306A EP2156021A1 EP 2156021 A1 EP2156021 A1 EP 2156021A1 EP 08736306 A EP08736306 A EP 08736306A EP 08736306 A EP08736306 A EP 08736306A EP 2156021 A1 EP2156021 A1 EP 2156021A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker arm
- spacer
- valve
- nut
- shaped profile
- 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
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
-
- 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
- F01L1/20—Adjusting or compensating clearance
Definitions
- the invention relates to a rocker arm of an internal combustion engine, wherein the rocker arm is actuated with a cam and at a first, valve-side end of the rocker arm is provided with an internally threaded recess into which an adjusting screw is screwed, wherein the first, valve-side end of the rocker arm a Has U-shaped profile and the screw is fixed with a nut in the recess.
- Rocker arms also known as toggle levers or valve rocker arms, are used to selectively open and close valves on internal combustion engines, such as, for example, a gasoline engine of a motor vehicle.
- a cam of a camshaft acts on a cam-side end of the rocker arm such that it moves at desired times in the operation of the internal combustion engine, for example, the inflow of an air-fuel mixture into a cylinder chamber or the outflow of combustion gases from the cylinder chamber enable.
- rocker arms which are produced in a casting process. Especially for weight savings, to reduce the moving masses at high speeds of the internal combustion engine, such a rocker arm can also be punched out of a metal sheet and formed in the desired manner.
- the rocker arm has a valve-side first end with a recess, in the internal thread of an adjusting screw is screwed, for example, one end of the screw can be formed substantially hemispherical in order to interact with a correspondingly shaped counter surface as possible on the valve to be controlled to be able to.
- the US 3,096,749 describes a rocker arm, which is composed of two U-shaped and welded together sheets.
- a receiving cylinder with an internal thread for receiving an adjusting screw is arranged or formed at a first, valve side end of the rocker arm, which passes through the two U-shaped plates of the rocker arm.
- This receiving cylinder and thus the male screw is disposed between two side cheeks of the first, valve-side end of the rocker arm.
- This rocker arm has a comparatively complicated structure, since it is composed of two sheet metal blanks and said receiving cylinder.
- the first valve-side end of the rocker arm is provided with a fastening opening for an adjusting screw, this first end region of the rocker arm, as can be seen from FIG. 3, being formed by folding over side cheeks of a U-shaped profile. so as to likewise obtain a material thickening at the location of the attachment opening.
- DE 103 38 837 A1 discloses a valve rocker arm in which a valve-side adjusting screw is arranged between two side cheeks of a U-shaped first end of the rocker arm.
- a fixing of the adjusting screw in an internally threaded mounting hole is made by a lock with two nuts or with a collar nut or with a nut with washer.
- the nuts are arranged on the side cheeks opposite side of the rocker arm and therefore difficult to access in the installed state of the internal combustion engine.
- a disadvantage of known rocker arms is that a fixing or locking of the valve-side adjusting screw with at least one nut, which is arranged between the side cheeks of a U-shaped profile of a first end of the rocker arm is very difficult to impossible, since the tightening or loosening of these nuts, for example, with a ring spanner or socket wrench, through the side walls and the cramped installation dimensions of the rocker arm is practically impossible.
- the invention has for its object to provide a rocker arm for an internal combustion engine, arranged between the side cheeks adjusting screw can be fixed in a simple manner by means of a nut.
- the invention is based on the finding that for fixing a set screw of a rocker arm at least one nut must be screwed and tightened on a corresponding external thread of the screw. If the nut is to be screwed onto the adjusting screw at the side on which side cheeks of a U-shaped profile of a valve-side first end of the rocker arm are formed, it is necessary to remove the fixing nut from the bottom of the U-shaped profile, for example a punching and bending process is made to space. For this purpose, an additional spacer is provided, which engages around the shank of the adjusting screw and is arranged between the at least one nut and the base of the U-shaped profile.
- the invention according to the features of the main claim relates to a rocker arm of an internal combustion engine, wherein the rocker arm is actuated with a cam and at a first, valve-side end of the rocker arm is provided with an internally threaded recess into which an adjusting screw is screwed, wherein the first , Valve side end of the rocker arm has a U-shaped profile and the screw is fixed with a nut in the recess.
- this rocker arm is provided that within a U-shaped profile of the first end of the rocker arm a spacer is disposed between a bottom of the U-shaped profile and the nut.
- the advantage of the rocker arm according to the invention is that an additional spacing of the nut from the bottom of the profile of the rocker arm is achieved by the additional spacer between that sheet metal portion of the rocker arm, which forms the profile base, and the screwed onto the screw nut.
- the length of the adjusting screw and / or the height of the spacer is preferably selected such that the screwed onto the screw nut, for example, can be acted upon with a ring spanner, without preventing the side cheeks this action.
- a spacer can be designed so lightweight that the entire moving mass of the rocker arm is only slightly increased. It is understood in the knowledge of the invention of itself that several nuts can be countered with respect to the screw or that a mother can be screwed with a device for self-assurance.
- the height of the spacer is at least as high or preferably even higher than the height of the side walls, measured from the bottom of the U-shaped profile to position the nut above the side cheeks, so that an actuation the same is always possible without restriction.
- the spacer is formed directly and thus integrally with the nut and has a round or polygonal outer geometry. Accordingly, a screw which has been extended axially so far is used that its screw head extends beyond the height of the side cheeks of the rocker arm. protrudes.
- An additional separate spacer is designed, for example, as a ring or as a block-shaped disk with a central recess and consists of a suitable material, for example a hard plastic or a metal. It may be formed as a separate component, which only at the
- rocker arm on the adjusting screw and fix it together with the nut. It is also possible that the spacer is firmly connected to the rocker arm. A separate metal spacer is fixed to the rocker arm, for example by means of spot welding or gluing, to avoid losing it.
- the side cheeks can be deformed or embossed such that a spacer made of metal or plastic is fixed at the location of the recess for the set screw.
- Such an additional embossing process can be advantageously carried out in the manufacture of the rocker arm.
- the additional spacer is integrally formed together with the first, valve-side end of the rocker arm. This can be done, for example, that the reason of the profile is performed at this end of the rocker arm with a larger frontal length than needed for the toggle lever itself. This pointing away in the longitudinal direction of the rocker arm of the axis of rotation of the rocker arm section can subsequently be folded over in a processing step substantially back on itself, so that this refolding comes to rest within the side cheeks on itself or on the actual first end of the rocker arm.
- the base of the U-shaped profile is cut out in the shape of a U-shape in the region of the recess, and subsequent refolding of this U-shaped section takes place in the direction of the end-side and valve-near end of the rocker arm. Finally, a perforation is made in this folded-over U-shaped section.
- an additional spacing of the nut from the actual bottom of the U-shaped profile is achieved and the punched-out in the bottom of the profile between the two side cheeks of the rocker arm sheet metal is obtained without additional material sections, so that the total weight of the rocker arm practically not increased is.
- the folded-over section or the folded-over U-shaped section is fixed in a form-fitting and / or material-locking manner to the bottom of the first end of the rocker arm.
- a cohesive fixation of the refolding can be realized for example by spot welding.
- FIG. 3 shows a rocker arm with a separate spacer and molded onto the spacer for fixing its side cheeks in a plan view
- Fig. 4 is a rocker arm with an integrated spacer, made by a sheet metal refolding, and
- FIG 5 shows a further rocker arm with an integrated spacer, produced by a separate punching and a sheet metal
- a rocker arm 1 is shown in a perspective view, which can be actuated at its second end remote from the valve by means of a not shown here for simplicity of illustration and arranged on a camshaft of an internal combustion engine cam in a conventional manner.
- valve-side end 2 of the rocker arm 1 a recognizable in Fig. 3 recess 3 is formed, which usually has an internal thread.
- a set screw 4 is screwed, which has one end key surfaces in the form of a square 5 for an operating tool. With its other end, the adjusting screw 4 directly or via another actuator with a Valve be brought into contact.
- a nut For fixation or locking of the adjusting screw 4 on the rocker arm 1 in a desired position depth is used in a conventional manner a nut. 6
- the first, valve-side end 2 of the rocker arm 1 has a substantially U-shaped profile with two side cheeks 7 and 8 and a bottom 9 of the profile connecting the two side cheeks.
- the entire rocker arm 1 has been punched out during its production from a sheet metal blank, perforated in the desired manner and reshaped.
- a spacer 10 is additionally provided which is arranged between the nut 6 and the base 9 of the U-shaped profile and the shaft of the adjusting screw 4 coaxially surrounds.
- the spacer 10 is formed as a separate ring, for example of a hard plastic or a metal.
- the spacer 10 may be spot welded or glued to the base 9 of the rocker arm 1 to prevent it from being lost.
- the spacer 10 may be formed as a substantially rectangular or square disc 12 or block with a central recess for the adjusting screw 4.
- Such an embodiment of the spacer 10 favors in a mounting the coaxial alignment of the recess thereof and the recess 3 in the bottom 9 of the rocker arm first
- the height of the same, seen in the axial direction of the adjusting screw 4 chosen such that it at least largely corresponds to the height of the side cheeks 7, 8 or even exceeds the side cheek height.
- An alternative mounting option for the spacer 10, here in the form of a ring, is an embossing or deformation of the side cheeks 7 and 8, to clamp the spacer 10 between the side cheeks 7, 8, as shown in Fig. 3.
- Fig. 4 Another possibility for the design of the spacer is shown in Fig. 4.
- the base 9 of the U-shaped profile of the first end 2 of the rocker arm 1 is executed extended end face and folded back by 180 ° on itself. This can be done by means of processing machines known per se, with the person skilled in the art selecting the material thickness or the materials suitable for this purpose. It is understood that the folded-over portion 11 also has a recess 3 for passing or screwing in the adjusting screw 4.
- FIG. 5 a further embodiment is shown in Fig. 5, in which the bottom 9 of the first end 2 of the rocker arm 1 is punched out in front of the front end and in front of the rocker arm-side recess 3 is substantially U-shaped. Subsequently, this U-shaped section 12 is also folded over by 180 ° on itself or on the bottom 9 to the front end 2 out and introduced the recess 3 in this double layer of material in order to screw the screw 4 can. As also shown in FIG. 5, on the base 9 of the rocker arm 1, a guide section 13 pointing in the direction of the valve is formed, which serves to increase the screw-in length of the adjusting screw 4. In both of the above embodiments according to FIGS.
- the folded-over sections 11, 12 can still be fixed in the folded-over position by means of spot welding.
- the height of the spacer thus formed is usually less than the height of the side cheeks 7, 8.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL08736306T PL2156021T3 (en) | 2007-05-10 | 2008-04-17 | Rocker arm of an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007021855A DE102007021855A1 (en) | 2007-05-10 | 2007-05-10 | Rocker arm of an internal combustion engine |
PCT/EP2008/054636 WO2008138702A1 (en) | 2007-05-10 | 2008-04-17 | Rocker arm of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2156021A1 true EP2156021A1 (en) | 2010-02-24 |
EP2156021B1 EP2156021B1 (en) | 2010-10-13 |
Family
ID=39684415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08736306A Not-in-force EP2156021B1 (en) | 2007-05-10 | 2008-04-17 | Rocker arm of an internal combustion engine |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2156021B1 (en) |
JP (1) | JP2010526958A (en) |
AT (1) | ATE484656T1 (en) |
DE (2) | DE102007021855A1 (en) |
PL (1) | PL2156021T3 (en) |
WO (1) | WO2008138702A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5381896B2 (en) * | 2010-05-21 | 2014-01-08 | 三菱自動車工業株式会社 | Rocker arm |
DE102016206959A1 (en) | 2016-04-25 | 2017-10-26 | Schaeffler Technologies AG & Co. KG | Tilting or drag lever of an internal combustion engine |
DE102016220939A1 (en) | 2016-10-25 | 2018-04-26 | Schaeffler Technologies AG & Co. KG | Tilting or drag lever of an internal combustion engine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3096749A (en) | 1960-11-25 | 1963-07-09 | Paramount Fabricating Co | Rocker arm and method of making the same |
JP3785859B2 (en) | 1999-06-30 | 2006-06-14 | 三菱電機株式会社 | Radar equipment |
JP3523134B2 (en) * | 1999-12-27 | 2004-04-26 | 本田技研工業株式会社 | Valve train for internal combustion engine |
GB0021181D0 (en) * | 2000-08-30 | 2000-10-18 | Perkins Engines Co Ltd | Method for automatically setting valve clearances setting valve clearances in an internal combustion engine |
US6807932B2 (en) | 2001-11-22 | 2004-10-26 | Ntn Corporation | Rocker arm |
JP2004076656A (en) * | 2002-08-20 | 2004-03-11 | Ntn Corp | Rocker arm |
JP3892373B2 (en) * | 2002-09-09 | 2007-03-14 | Ntn株式会社 | Rocker arm |
DE10338837A1 (en) | 2003-08-21 | 2004-11-11 | Infineon Technologies Ag | Production of DNA chip arrays, to duplicate and characterize nucleic acids, has a structure of ring-shaped sample chambers mounted on an optically transparent wafer carrier which is divided into separate chip arrays |
-
2007
- 2007-05-10 DE DE102007021855A patent/DE102007021855A1/en not_active Withdrawn
-
2008
- 2008-04-17 EP EP08736306A patent/EP2156021B1/en not_active Not-in-force
- 2008-04-17 JP JP2010506880A patent/JP2010526958A/en active Pending
- 2008-04-17 PL PL08736306T patent/PL2156021T3/en unknown
- 2008-04-17 WO PCT/EP2008/054636 patent/WO2008138702A1/en active Application Filing
- 2008-04-17 DE DE502008001539T patent/DE502008001539D1/en active Active
- 2008-04-17 AT AT08736306T patent/ATE484656T1/en active
Non-Patent Citations (1)
Title |
---|
See references of WO2008138702A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL2156021T3 (en) | 2011-04-29 |
JP2010526958A (en) | 2010-08-05 |
DE502008001539D1 (en) | 2010-11-25 |
ATE484656T1 (en) | 2010-10-15 |
DE102007021855A1 (en) | 2008-11-13 |
WO2008138702A1 (en) | 2008-11-20 |
EP2156021B1 (en) | 2010-10-13 |
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