DE10235403A1 - Swivel lever for a variable stroke valve train - Google Patents

Swivel lever for a variable stroke valve train

Info

Publication number
DE10235403A1
DE10235403A1 DE10235403A DE10235403A DE10235403A1 DE 10235403 A1 DE10235403 A1 DE 10235403A1 DE 10235403 A DE10235403 A DE 10235403A DE 10235403 A DE10235403 A DE 10235403A DE 10235403 A1 DE10235403 A1 DE 10235403A1
Authority
DE
Germany
Prior art keywords
roller element
roller
element
swivel lever
hand
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.)
Withdrawn
Application number
DE10235403A
Other languages
German (de)
Inventor
Michael Allgeier
Torsten Eder
Benedikt Dr. Klaus
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.)
Bayerische Motoren Werke AG
PSA Automobiles SA
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE10235403A priority Critical patent/DE10235403A1/en
Publication of DE10235403A1 publication Critical patent/DE10235403A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005Deactivating valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00Valve arrangements comprising rollers

Abstract

Swivel lever (3) for a variable-stroke valve train (2) in a cylinder head (1) of an internal combustion engine, which on the one hand has a roller element (4) with an oscillation pivot point (4 ') on a slide track (5'), a slide (5) and on the other hand A control track (6) is supported without play on an intermediate element (7) to a gas exchange valve (8), the swivel lever (3) for adjusting the stroke between the support points on the one hand by a cam (9) of a camshaft (9 ') against a force of a spring (10) can be pivoted in a controlled manner and, on the other hand, the roller element (4) can be displaced in a controlled manner by an adjusting device (11) for adjusting the lifting height parallel to the slide track (5 '), the roller element (4) comprising at least a first roller element (4a) and a second roller element ( 4b) and is supported radially by at least one roller bearing (12). DOLLAR A Due to the proposed design of the pivot lever, the internal friction and thus the wear of the pivot lever is reduced.

Description

  • The invention relates to a pivot lever for one stroke variable valve train according to the characteristics in the preamble of claim 1.
  • It is based on the as yet unpublished German patent application DE 101 23 186 out. In this a valve drive device for variable stroke adjustment of a gas exchange valve of an internal combustion engine is described. In the valve drive device, the gas exchange valve is in operative connection with a control element with a roller movable about an axis of rotation with a control path comprising an idle stroke curve and a stroke curve, which is arranged in an end region of a pivot lever controlled by a cam of a camshaft for actuating the gas exchange valve. The pivot lever, which is assigned to the cam without play by means of a spring via a roller, is supported at the other end along a circular path for the variable stroke position of the gas exchange valve via a positionally adjustable and fixable oscillating pivot point controlled by an adjusting device. In order to achieve a purely rotary movement or pure pivoting movement of the pivoting lever about its pivot point with a reduced stroke of the gas exchange valve, a circular path arranged on a housing part of the internal combustion engine is used as a backdrop with a radius “R” around the axis of rotation of the roller of the transmission element for controlled, position-adjustable support of the pivot lever provided.
  • Because the first role element 4 both on the adjustment device 11 as well as being supported on the slide track, relatively high frictional forces can occur when the pivoting lever is adjusted, as a result of which increased wear can occur.
  • Object of the present invention is to reduce friction for one generic pivot lever show.
  • This task is due to the characteristics solved in the characterizing part of claim 1.
  • The division of the role element in two separate roll elements leads to more advantageous Way the first roller element or the second roller element each only in operative connection either with the backdrop or with the adjustment unit stands. Manufacturing-related tolerances in roll production can can be better compensated by this arrangement, which makes the inner Friction and thus wear are reduced becomes.
  • In a configuration according to claim 2 add up the bearing tolerances of the first roller element and of the second roller element, so that production-related Tolerances can be compensated even better.
  • The complex design according to claims 3 and 4 has the lowest friction losses during operation of the pivot lever and therefore the least wear.
  • The design according to claim 5 shows the best power distribution and the lowest in operation Friction, which in turn increases the lifespan, the internal friction Wear and the Fuel consumption of the internal combustion engine is minimized.
  • The invention is described below two preferred embodiments in five Figures closer explained.
  • 1 shows a schematic structure of a variable stroke valve train,
  • 2 shows a plan view of a swivel lever according to the invention,
  • 3 shows a first embodiment based on a section through the pivot lever,
  • 4 shows a second embodiment also as a section through the pivot lever,
  • 5 shows the second embodiment in one opposite 4 90 ° cut through the swivel lever.
  • For the same components apply in the 1 to 5 the same reference numerals.
  • 1 shows a variable stroke valve train 2 , which is shown in a rudimentary cylinder head 1 is arranged. The variable stroke valve train 2 consists essentially of a swivel lever 3 , with a roller element 4 and a swing pivot 4 ' , a third role element 13 , as well as a backdrop 5 with a backdrop 5 ' , an intermediate element 7 , a gas exchange valve 8th , a cam 9 that on a camshaft 9 ' is arranged as well as a spring 10 and an adjustment device 11 , The swivel lever 3 is supported on the one hand by the roller element 4 on the backdrop 5 ' the backdrop 5 and on the other hand with a control track 6 that from an idle stroke curve 6 ' and a stroke curve 6 '' consists on the intermediate element 7 from. The intermediate element 7 is a roller rocker arm, its roller around an axis of rotation 12 is rotatable. The axis of rotation 12 is also the center of the backdrop 5 ' in a zero stroke position. The intermediate element is supported on the one hand by the axis of rotation 12 on a game compensation element 14 , here a hydraulic valve lash adjuster, and on the other hand on the gas exchange valve 8th from. Between the control lane 6 and the first roller element 4 is on the swivel lever 3 parallel to the first roller element 4 the third role element 13 arranged. This is in operative connection with the cam 9 , When the camshaft rotates 9 ' pivots the pan lever 3 and pushes with its stroke curve 6 '' the gas exchange valve in an open position, not shown. The first role element 4 is next to the support on the backdrop 5 ' continue on an adjustment device 11 supported with which the swing pivot 4 ' of the first roll element 4 parallel to the backdrop 5 ' can be moved. Such a shift causes a change in the valve lift.
  • 2 shows the side view of a pivot lever 3 for the first and the second embodiment. The swivel lever 3 consists of an approximately box-shaped housing 3 ' which on one end is the control track 6 , with the idle stroke curve 6 ' and the stroke curve 6 " and a first hole on the opposite end 15 that are normal to the control track 6 is aligned. In the first hole 15 there is a first bolt 16 , Radially around the first bolt 16 is the role element 4 arranged. Between the roller element 4 and the control track 6 there is a second hole 15 ' in which a second bolt 16 ' parallel to the first bolt 16 is stored. Radially on the outer circumference is around the bolt 16 ' is the third role element 13 rotatably mounted. Through the axes of the first hole 15 and the second hole 15 ' a section AA is drawn. This section AA corresponds to the representations in 3 and 4 for one embodiment.
  • 3 shows a section through the plane AA for a first embodiment of the pivot lever 3 , In the first embodiment is radially on the outer circumference around the first bolt 16 a rolling bearing 17 arranged. Radial around this rolling bearing 17 the roller element is rotatable 4 , inside the case 3 ' stored. The role element 4 is divided into two first role elements 4a and a second roller element 4b , The role element 4b extends in the axial direction over the entire length of the rolling bearing 17 , corresponding to an internal dimension of the housing, not shown 3 ' , Radially on the outer circumference of the first roller element 4b are the two second role elements 4a rotatably arranged. The first two role elements 4a form with the second roller element 4b a plain bearing. The swivel lever is used to operate the variable valve train 3 with the second roller element 4b on the adjustment device 11 supported while being with the first roller element 4a on the backdrop 5b the backdrop 5 rolls. Otherwise the execution corresponds to 3 the execution in 2 ,
  • In further exemplary embodiments, only a first roller element can also be used 4a can be provided, this then being in axial alignment over approximately one half of the second roller element 4b extends or in the middle of the second Rolle element 4b is arranged. A roller bearing of the first roller element 4a on the second roller element 4b is possible.
  • 4 shows the section through the swivel lever 3 in the plane AA for a second embodiment. In this are radially on the outer circumference around the first bolt 16 two first role elements 4a and a second roller element 4b , from the housing 3 ' limited, rotatably mounted. These first role elements 4a and the second roller element 4b are arranged next to each other in the axial direction compared to the first embodiment and each have their own rolling bearing 17 ' . 17 '' . 17 '' 'compared to the first bolt 16 , As in the first embodiment, the first roller element 4a with the adjustment device 11 in operative connection while the second roller element 4b with the backdrop 5 ' the backdrop 5 is in operative connection. A section BB is drawn centrally, which is rotated by 90 ° with respect to section AA.
  • In a further exemplary embodiment, as in the case of the first exemplary embodiment, only a single first roller element can 4a be provided. In this case, the first role element 4a and the second roller element 4b in the axial direction of the first bolt 16 again side by side.
  • For all exemplary embodiments, the roller bearing applies 17 . 17 ' . 17 '' . 17 '' 'can be designed as a needle bearing and possibly also as a plain bearing.
  • 5 shows one opposite for illustration 4 90 ° rotated section through the pivot lever for the second embodiment. The figure description of 4 ,
  • 1
    cylinder head
    2
    Hubvariabler valve train
    3
    pivoting lever
    3 '
    casing
    4
    roller element
    4a
    first roller element
    4b
    second roller element
    4 '
    Swing fulcrum
    5
    scenery
    5 '
    link path
    6
    control track
    6 '
    Leerhubkurve
    6 ''
    stroke curve
    7
    intermediate element
    8th
    Gas exchange valve
    9
    cam
    9 '
    camshaft
    10
    feather
    11
    adjustment
    12
    axis of rotation
    13
    third roller element
    14
    Lash adjuster
    15
    First drilling
    15 '
    Second drilling
    16
    first bolt
    16 '
    second bolt
    17
    roller bearing
    17 ', 17 ''
    17 ''' Separate roller bearing

Claims (5)

  1. Swivel lever ( 3 ) for a variable stroke valve train ( 2 ) in a cylinder head ( 1 ) of an internal combustion engine, which on the one hand has a roller element ( 4 ) with a pivot point ( 4 ' ) on a backdrop ( 5 ' ) a backdrop ( 5 ) and on the other hand with a control track ( 6 ) on an intermediate element ( 7 ) to a gas exchange valve ( 8th ) is supported without play, the swivel lever ( 3 ) for stroke adjustment between the support points on the one hand by a cam ( 9 ) a camshaft ( 9 ' ) against the force of a spring ( 10 ) controlled swiveling and on the other hand the roller element ( 4 ) from an adjustment device ( 11 ) for height adjustment parallel to the slide path ( 5 ' ) can be moved in a controlled manner, characterized in that the roller element ( 4 ) from at least one first roller element ( 4a ) and a second roller element ( 4b ) exists and radially from at least one roller bearing ( 17 ) is stored.
  2. Swivel lever according to claim 1, characterized in that at least one first roller element ( 4a ) radially on the outer circumference of the second roller element ( 4b ) is stored.
  3. Swivel lever according to claim 1, characterized in that the first roller element ( 4a ) and the second roller element ( 4b ) are mounted side by side in the axial direction.
  4. Swivel lever according to claim 2 or 3, characterized in that the first roller element ( 4a ) and the second roller element ( 4b ) each on a separate roller bearing ( 17a . 17b . 17c ) are arranged.
  5. Swivel lever according to one of the aforementioned claims, characterized in that the roller bearing ( 17a . 17b . 17c ) is a needle bearing.
DE10235403A 2002-08-02 2002-08-02 Swivel lever for a variable stroke valve train Withdrawn DE10235403A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10235403A DE10235403A1 (en) 2002-08-02 2002-08-02 Swivel lever for a variable stroke valve train

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10235403A DE10235403A1 (en) 2002-08-02 2002-08-02 Swivel lever for a variable stroke valve train
EP03015068A EP1387048B1 (en) 2002-08-02 2003-07-03 Rocking lever for valve drive with variable lift
DE50312150A DE50312150D1 (en) 2002-08-02 2003-07-03 Swivel lever for a variable-stroke valve drive

Publications (1)

Publication Number Publication Date
DE10235403A1 true DE10235403A1 (en) 2004-02-12

Family

ID=30010568

Family Applications (2)

Application Number Title Priority Date Filing Date
DE10235403A Withdrawn DE10235403A1 (en) 2002-08-02 2002-08-02 Swivel lever for a variable stroke valve train
DE50312150A Active DE50312150D1 (en) 2002-08-02 2003-07-03 Swivel lever for a variable-stroke valve drive

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE50312150A Active DE50312150D1 (en) 2002-08-02 2003-07-03 Swivel lever for a variable-stroke valve drive

Country Status (2)

Country Link
EP (1) EP1387048B1 (en)
DE (2) DE10235403A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008389A1 (en) * 2004-02-20 2005-09-08 Bayerische Motoren Werke Ag Valve drive for an I.C. engine comprises a first adjusting device with a cam whose radius increases or decreases over a periphery with respect to a rotating axle
DE102006018510A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Swinging arm for stroke-variable valve gear of internal combustion engine, has stroke area, where maximum width of stroke area is formed larger or equal to maximum width of idle-stroke area and larger than minimum width of idle-stroke area
DE102006018512A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Roller element for a pivotable machine part
DE102015118884A1 (en) * 2015-11-04 2017-05-04 Pierburg Gmbh Mechanically controllable valve train

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4766007B2 (en) * 2007-06-14 2011-09-07 トヨタ自動車株式会社 Variable valve gear
DE102011003898A1 (en) * 2011-02-10 2012-08-16 Schaeffler Technologies Gmbh & Co. Kg Intermediate lever
DE102011003900A1 (en) * 2011-02-10 2012-08-16 Schaeffler Technologies Gmbh & Co. Kg Intermediate lever
DE102014100748B4 (en) * 2014-01-23 2017-04-27 Pierburg Gmbh Transmission arrangement for a mechanically controllable valve train and mechanically controllable valve train
DE102014109573A1 (en) * 2014-07-09 2016-01-14 Pierburg Gmbh Mechanically controllable valve train
DE102016122179A1 (en) * 2016-11-18 2018-05-24 Pierburg Gmbh Mechanically controllable valve train

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223173A1 (en) * 1992-07-15 1994-01-20 Bayerische Motoren Werke Ag Valve mechanism for vehicle IC engine - has different lift curves for each pair of valves per cylinder controlled by roller-actuated eccentrics
DE4446725A1 (en) * 1993-07-06 1996-01-11 Meta Motoren Energietech Method for variably controlling valve in IC engine
EP1022443A1 (en) * 1999-01-19 2000-07-26 Ford Global Technologies, Inc. Variable valve drive for internal combustion engine
DE19920512A1 (en) * 1999-05-05 2000-11-09 Opel Adam Ag Device for actuating a valve with a variable stroke on internal combustion engines
DE19960742A1 (en) * 1999-12-16 2001-06-21 Iav Gmbh Variable valve drive, preferably for combustion engine, has pressure roller rotatably mounted in swinging arm with pivot axis fixed relative to cylinder head but adjustable in position
EP1255027A1 (en) * 2001-05-03 2002-11-06 STS System Technology Services GmbH Mechanic control of variable lift of an intake valve of an internal combustion engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913742A1 (en) * 1999-03-26 2000-09-28 Bayerische Motoren Werke Ag Device for stroke adjustment of a gas exchange valve in the cylinder head of an internal combustion engine
EP1096115B1 (en) * 1999-10-29 2002-07-10 STS System Technology Services GmbH Mechanically controlled intake valve lift in an internal combustion engine
DE10016103A1 (en) * 2000-03-31 2001-10-04 Audi Ag Variable valve timing
DE10123186A1 (en) 2001-05-12 2002-11-14 Bayerische Motoren Werke Ag Valve gear device for variable lift adjustment is for gas exchange valve of internal combustion engine and has valve vai intermediary of transmission component effectively connected to roller movable around rotary axis

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223173A1 (en) * 1992-07-15 1994-01-20 Bayerische Motoren Werke Ag Valve mechanism for vehicle IC engine - has different lift curves for each pair of valves per cylinder controlled by roller-actuated eccentrics
DE4446725A1 (en) * 1993-07-06 1996-01-11 Meta Motoren Energietech Method for variably controlling valve in IC engine
EP1022443A1 (en) * 1999-01-19 2000-07-26 Ford Global Technologies, Inc. Variable valve drive for internal combustion engine
DE19920512A1 (en) * 1999-05-05 2000-11-09 Opel Adam Ag Device for actuating a valve with a variable stroke on internal combustion engines
DE19960742A1 (en) * 1999-12-16 2001-06-21 Iav Gmbh Variable valve drive, preferably for combustion engine, has pressure roller rotatably mounted in swinging arm with pivot axis fixed relative to cylinder head but adjustable in position
EP1255027A1 (en) * 2001-05-03 2002-11-06 STS System Technology Services GmbH Mechanic control of variable lift of an intake valve of an internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008389A1 (en) * 2004-02-20 2005-09-08 Bayerische Motoren Werke Ag Valve drive for an I.C. engine comprises a first adjusting device with a cam whose radius increases or decreases over a periphery with respect to a rotating axle
US7225773B2 (en) 2004-02-20 2007-06-05 Bayerische Motoren Werke Aktiengesellschaft Variable stroke valve drive for an internal combustion engine
DE102006018510A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Swinging arm for stroke-variable valve gear of internal combustion engine, has stroke area, where maximum width of stroke area is formed larger or equal to maximum width of idle-stroke area and larger than minimum width of idle-stroke area
DE102006018512A1 (en) * 2006-04-21 2007-10-25 Schaeffler Kg Roller element for a pivotable machine part
DE102015118884A1 (en) * 2015-11-04 2017-05-04 Pierburg Gmbh Mechanically controllable valve train

Also Published As

Publication number Publication date
EP1387048B1 (en) 2009-11-25
EP1387048A3 (en) 2007-07-25
EP1387048A2 (en) 2004-02-04
DE50312150D1 (en) 2010-01-07

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: BAYERISCHE MOTOREN WERKE AG, 80809 MüNCHEN, DE

Owner name: PEUGEOT CITROEN AUTOMOBILES S.A., VELIZY-VILLA, FR

8128 New person/name/address of the agent

Representative=s name: BEETZ & PARTNER PATENTANWäLTE, 80538 MüNCHEN

8141 Disposal/no request for examination
8170 Reinstatement of the former position
8110 Request for examination paragraph 44
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20120301