WO2011157499A1 - Levier oscillant pour un mécanisme de distribution d'un moteur à combustion interne - Google Patents

Levier oscillant pour un mécanisme de distribution d'un moteur à combustion interne Download PDF

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Publication number
WO2011157499A1
WO2011157499A1 PCT/EP2011/057847 EP2011057847W WO2011157499A1 WO 2011157499 A1 WO2011157499 A1 WO 2011157499A1 EP 2011057847 W EP2011057847 W EP 2011057847W WO 2011157499 A1 WO2011157499 A1 WO 2011157499A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever
cam
cam roller
needle
drag lever
Prior art date
Application number
PCT/EP2011/057847
Other languages
German (de)
English (en)
Inventor
Stephan Möck
Original Assignee
Schaeffler Technologies Gmbh & 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 Gmbh & Co. Kg filed Critical Schaeffler Technologies Gmbh & Co. Kg
Priority to CN201180029482.8A priority Critical patent/CN102947552B/zh
Publication of WO2011157499A1 publication Critical patent/WO2011157499A1/fr

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
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers

Definitions

  • the invention relates to a drag lever for a valve train of an internal combustion engine, which serves to actuate a gas exchange valve and having a pivotally supported at one end lever, at the otherem end a valve stem support for the valve stem end of the gas exchange valve is formed, and with a cam roller on during operation of the internal combustion engine, a cam of a camshaft starts and which is mounted by means of a needle bearing having a needle bearing on a pivot pin, wherein the axle pin is arranged in bores of spaced apart side walls of the lever and wherein the axial dimension of the needle ring is greater than the width the cam roller on its cam-facing cam contact surface.
  • Drag levers are arranged in internal combustion engines with overhead camshaft within the valve train as transmission elements between the cams and the gas exchange valves to be actuated. They consist of a one-armed lever, which is supported by means of its one end on a mostly hydraulically adjustable support member and engages with its other end via a valve stem support on the gas exchange valve to be opened. In the central portion of the lever either a sliding surface or a cam roller are arranged, to which the respective cam starts and causes the pivoting movement of the finger lever. By using this cam roller, which rolls on the circumference of the respective cam, the friction in the valve train can be significantly reduced, so that it is possible to achieve a significant reduction in fuel consumption during operation of the internal combustion engine.
  • valve trains with cam followers which have a cam roller
  • cam followers which have a cam roller
  • These cam followers can also be provided with a cam roller.
  • a drag lever of the type described in the preamble of claim 1 is known from DE 101 21 798 A1. This drag lever has a cam roller which fills the entire space between the spaced side walls of the lever.
  • the raceways for a bearing for the cam roller on a spindle serving Nellellager should be made wider to reduce the surface pressure (Hertzian pressure) on the corresponding raceways of an inner ring and an outer ring.
  • the drag lever is provided for a variable-stroke valve drive, in which at least two cams with a different outer contour and a uniform cam base circle are provided for each gas exchange valve to be actuated.
  • the different cam contour also includes differences in cam lobe, that is, there is a cam with a large cam lobe and a cam with a small cam lobe, wherein the cam lobe is slidably mounted on the camshaft so as to selectively engage one of the two lobes on the outer circumference of the cam roller.
  • the cam roller On its outer circumference, the cam roller is provided in each case in the edge region with circumferential recesses, whereby a free space is provided in which the cam can move freely with large cam lobe when the adjacent cam with small cam lobe actuates the cam follower on the cam roller.
  • the cam roller whose provided for the radial contact with the needle ring inner raceway and outer race are therefore wider than its provided on the outer circumference cam contact surface.
  • the invention has the object of providing a drag lever of the type mentioned in such a way that the weight of this lever and its manufacturing costs are reduced. Summary of the invention
  • the lever based on its longitudinal center plane to be formed symmetrically.
  • the lever may have a relatively simple geometric shape and can therefore be produced using a low-cost manufacturing process.
  • an advantage is terhin, if the spacer sleeve has special sliding properties, that is, that it is slidably guided both at the ends of the needle ring than on the lateral surface of the side wall.
  • an inner race for the needles of the needle ring can be formed directly on the axle. The axially above the cam roller protruding needles roll over its entire length on the axle from. The spacer then supports only at the end of the needle ring and on the side wall.
  • a separate inner ring on the axle which forms an inner race corresponding to the width of the needle ring. This inner ring may be rotatably mounted on the axle.
  • the lever seen in cross section, U-shaped, wherein the side walls are interconnected by a transverse wall, in which a serving for receiving the cam roller recess is arranged.
  • This lever profile has a sufficient rigidity and can be produced in an advantageous manner by a non-cutting shaping process, in particular by cold deformation, from a punched sheet metal blank.
  • the outer ring of the cam roller can be guided on the front side at the edges of the recess.
  • the appropriately trained roller cam follower should be arranged in the valve train such that the open U-shaped profile is remote from the support element and the gas exchange valve.
  • the cap and the support which acts directly on the end of a valve stem, are formed.
  • the transverse wall can have a course, radially to the protruding end of the needle ring, so that sufficient clearance for this created and the rigidity of the lever is not affected.
  • the axial dimension of the needle bearing by 30% to 60% greater than the width of the cam roller.
  • a corresponding relation of the width of the cam roller to the width of the needle ring results in that the Hertzian pressure is reduced sufficiently and that the structural dimensions of the finger lever still allow its space-saving arrangement in the valve train.
  • a cam follower cam lever is provided for a switchable valve train, in which roll on the camshaft, at least two axially displaceable cam with different cam contours optionally on the outer circumference of the cam roller.
  • a corresponding valve drive is explained in detail in DE 100 54 623 A1.
  • a corresponding clearance of the large cam can be achieved in that the side wall lying in this area is provided at its upper edge with a flattening or recess.
  • FIG. 1 shows a plan view of a drag lever according to the invention
  • FIG. 2 shows a perspective view of the finger lever according to FIG. 1,
  • FIG. 3 shows a longitudinal section along the line III - III through the drag lever of Figure 1 and
  • FIG. 4 shows a perspective view from below of the drag lever according to FIG. 1
  • a drag lever which consists essentially of a U-shaped lever 2 and a cam roller 3.
  • the U-shaped lever 2 is formed as a chipless manufactured sheet metal part, wherein in the context of the forming process first a blank punched out of sheet metal and then cold-formed.
  • the lever 2 has a transverse wall 4 and side walls 5 and 6 extending therefrom.
  • the transverse wall 4 is formed as a valve stem support 7, with which the lever 2 rests on one end of a valve stem, not shown, of a gas exchange valve.
  • a dome 8 is formed in the transverse wall 4, via which the lever 2 used in the valve drive is supported on a support element, also not shown.
  • This support element is preferably formed hydraulically variable in length.
  • the cam roller 3 is arranged in the transverse wall 4 in a recess 9 designed substantially with a rectangular outer contour.
  • a first end 10 a of a needle ring 10 of which individual needles 1 1 can be seen in the illustration according to FIG. 1, protrudes on one side over a first end face 12 of the cam roller 3.
  • the ends 10a of the needles 1 1 are up to an inner circumferential surface 13 of the side wall 6 reaching and guided on this sliding.
  • a spacer sleeve 15 is arranged between the side wall 5 of the lever 2 and the second ends 10b of the needle ring 10, whose axial dimension substantially corresponds to that of the projection of the needle ring 10 on the first end face 12. Furthermore, it can be seen from FIG. 1 that an injection opening 16 directed onto the cam roller 3 is provided on the dome 8, via which lubricating oil is applied to the cam roller 3. In the region of the projecting first end 10 a of the needle ring 10 and the spacer sleeve 15, as shown in FIG.
  • the transverse wall 4 is provided with a bulge 17 downwards, ie, the transverse wall 4 extends radially to the needle ring 10 and to the spacer sleeve and thus creates a sufficient space, in particular for the above needles 1 1.
  • the cam roller 3 has an outer ring 8 with a cam contact surface 19 and an outer race 20 for the needle rim 10. Furthermore, the needles 1 1 of the needle bearing are guided on an inner race 21 formed on an inner ring 21, wherein this inner ring 21 and thus the entire cam roller 3 by means of an axle pin 23 relative to the side walls 5 and 6 is mounted. On this pivot pin 23 and the spacer sleeve 15 is arranged, wherein it rests both at the end of the inner ring 21 and at the second ends 10b of the needle bearing 10.
  • the side walls are otherwise provided with flats 24, so that a switchable valve train with a longitudinally displaceable on a camshaft cam pair ensures sufficient clearance of the large cam. Furthermore, the side walls 5 and 6 in the region of the dome 8 grooves 25 and 26, in which a clip, not shown, on the side walls 5 and 6 can be fixed.
  • This clamp serves to connect the drag lever 1 with the support element to a preassembled unit that can be delivered for assembly in the corresponding cylinder head.
  • the lever 2 is provided in the region of the support 7 with tabs 27 and 28, which extend from the side walls 5 and 6 and are bent to below the transverse wall 4. These bent tabs 27 and 28 are spaced apart from each other by a distance that corresponds approximately to the diameter of the valve creating end.
  • FIG. 1 to 4 it can be seen that the relatively narrow formed cam roller 3 is provided with a considerably wider needle ring 10, which projects beyond the cam roller 3 on one side, so that the surface pressure of the trained as needles 1 1 rolling elements on the inner ring 22 are significantly reduced can.
  • the lever 2 is formed symmetrically, ie, the axial clearance between the side wall 5 and the second end 10b of the needle bearing 10 is compensated by the spacer sleeve 15.

Landscapes

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

Abstract

L'invention concerne un levier oscillant (1) comportant un galet de came (3) monté sur un boulon-pivot d'axe (24) au moyen d'une cage à aiguilles (10). Le boulon-pivot d'axe (23)est disposé dans des perçages de parois latérales (5 et 6) du levier (2) agencées à une certaine distance l'une de l'autre, et afin de réduire la pression hertzienne, une dimension axiale de la cage à aiguilles (10) est supérieure à la largeur du galet de came (3) sur sa surface de contact de came (19) tournée vers la came. Selon l'invention, une première extrémité (10a) de la cage à aiguilles (10) dépasse d'un premier côté frontal (12) du galet de came (3) et se termine au voisinage immédiat de la paroi latérale correspondante (5) du levier (2) ou s'applique contre celle-ci. De plus, la cage à aiguilles (10) est bordée, à sa seconde extrémité (10b), sensiblement par un second côté frontal (14) du galet de came (3). Une douille d'écartement (15) est disposée entre cette seconde extrémité (10b) de la cage à aiguilles (10) et la paroi latérale (5) tournée vers celle-ci.
PCT/EP2011/057847 2010-06-17 2011-05-16 Levier oscillant pour un mécanisme de distribution d'un moteur à combustion interne WO2011157499A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201180029482.8A CN102947552B (zh) 2010-06-17 2011-05-16 用于内燃机阀传动件的牵引杆

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010024196.2 2010-06-17
DE102010024196A DE102010024196A1 (de) 2010-06-17 2010-06-17 Schlepphebel für einen Ventiltrieb einer Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2011157499A1 true WO2011157499A1 (fr) 2011-12-22

Family

ID=44351571

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/057847 WO2011157499A1 (fr) 2010-06-17 2011-05-16 Levier oscillant pour un mécanisme de distribution d'un moteur à combustion interne

Country Status (3)

Country Link
CN (1) CN102947552B (fr)
DE (1) DE102010024196A1 (fr)
WO (1) WO2011157499A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012203107A1 (de) 2012-02-29 2013-08-29 Schaeffler Technologies AG & Co. KG Schlepphebel
CN103321701A (zh) * 2012-03-23 2013-09-25 谢夫勒科技股份两合公司 气门压杆

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012211525A1 (de) * 2012-07-03 2014-01-09 Schaeffler Technologies AG & Co. KG Nockenfolger für den Ventiltrieb einer Brennkraftmaschine
EP3181836B1 (fr) * 2015-12-17 2020-02-05 Aktiebolaget SKF Dispositif suiveur de came à galet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10054623A1 (de) 2000-11-03 2002-05-08 Audi Ag Vorrichtung zum Umschalten zumindest eines Nockenpaketes
DE10121798A1 (de) 2001-05-04 2002-11-07 Audi Ag Ventiltrieb für eine Brennkraftmaschine
JP2009281217A (ja) * 2008-05-21 2009-12-03 Ntn Corp ロッカーアーム用カムフォロアおよびカムフォロア装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62203910U (fr) * 1986-06-13 1987-12-26
JP2005201066A (ja) * 2004-01-13 2005-07-28 Koyo Seiko Co Ltd ロッカアーム
CN100593631C (zh) * 2007-06-06 2010-03-10 马振万 一种发动机气门摇臂装置
US20090078224A1 (en) * 2007-09-26 2009-03-26 Scott Paul Smith Cam follower rocker arm

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10054623A1 (de) 2000-11-03 2002-05-08 Audi Ag Vorrichtung zum Umschalten zumindest eines Nockenpaketes
DE10121798A1 (de) 2001-05-04 2002-11-07 Audi Ag Ventiltrieb für eine Brennkraftmaschine
JP2009281217A (ja) * 2008-05-21 2009-12-03 Ntn Corp ロッカーアーム用カムフォロアおよびカムフォロア装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012203107A1 (de) 2012-02-29 2013-08-29 Schaeffler Technologies AG & Co. KG Schlepphebel
CN103321701A (zh) * 2012-03-23 2013-09-25 谢夫勒科技股份两合公司 气门压杆
DE102012204727A1 (de) 2012-03-23 2013-09-26 Schaeffler Technologies AG & Co. KG Schlepphebel
US20130263694A1 (en) * 2012-03-23 2013-10-10 Schaeffler Technologies AG & Co. KG Cam

Also Published As

Publication number Publication date
CN102947552A (zh) 2013-02-27
DE102010024196A1 (de) 2011-12-22
CN102947552B (zh) 2014-12-24

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