US20230075127A1 - Variable-Stroke Valve Drive With a Double Leg Spring - Google Patents

Variable-Stroke Valve Drive With a Double Leg Spring Download PDF

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Publication number
US20230075127A1
US20230075127A1 US17/794,755 US202017794755A US2023075127A1 US 20230075127 A1 US20230075127 A1 US 20230075127A1 US 202017794755 A US202017794755 A US 202017794755A US 2023075127 A1 US2023075127 A1 US 2023075127A1
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US
United States
Prior art keywords
spring
leg
variable
stroke
valve drive
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
US17/794,755
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English (en)
Inventor
Johannes Meyer
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
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
Assigned to BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT reassignment BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MEYER, JOHANNES
Publication of US20230075127A1 publication Critical patent/US20230075127A1/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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications 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
    • F01L13/0063—Modifications 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
    • 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
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L2001/467—Lost motion springs
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications 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
    • F01L13/0063—Modifications 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
    • F01L2013/0068—Modifications 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
    • 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 variable-stroke valve drive having a double leg spring in a cylinder head of an internal combustion engine.
  • a generic double leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine is known from the German first and unexamined publication DE 101 22 152 A1, for example. Described in this first and unexamined publication is an assembly aid for a double leg spring for a variable-stroke valve drive in a cylinder head of an internal combustion engine, wherein the double leg spring is embodied by at least one first and one second leg spring which are disposed so as to be largely coaxial to a common spring axis, and the first leg spring has a first spring leg and the second leg spring has a second spring leg, wherein the winding directions of the first and of the second leg spring are mutually opposite, and the first and the second leg spring in the region of the reversal of the winding direction conjointly form a common intermediate leg which is able to be connected to a portion of the cylinder head, wherein the assembly aid, by way of the intermediate leg in a pre-loaded operating position, releasably connects the first and the second spring
  • variable-stroke valve drive for an internal combustion engine is known from DE 10 2006 033 559 A1.
  • the variable-stroke valve drive for an internal combustion engine has at least one first and one second cylinder and identically acting charge-cycle valves, wherein each cylinder is assigned one charge-cycle valve activation unit.
  • This charge-cycle valve activation unit is composed of at least:
  • an intermediate lever which is mounted so as to be displaceable on a guideway track of a guideway, on the one hand, and has a working curve, on the other hand, wherein the working curve by way of an intermediate element is operatively connected to a charge-cycle valve, wherein a first actuation device for rotating the intermediate lever, counter to a spring force of a spring element, about a guideway proximal point is provided, wherein the intermediate lever by way of a second actuation device is displaceable along the guideway track, wherein the second actuation device has a first setting point for a zero stroke, at least one second setting point for a partial stroke, and a third setting point for a full stroke of the charge-cycle valve, and wherein the charge-cycle valve of the first cylinder is assigned a first second actuation device, and the charge-cycle valve of the second cylinder is assigned a second second actuation device.
  • valve drive with a double leg spring in a cylinder head of an internal combustion engine.
  • the valve drive comprises a pivot lever which by way of a rolling element having a pivot point is supported on a guideway track of a guideway, on the one hand, and by way of a control track is supported so as to be clearance-free on an intermediate element to a charge-cycle valve, on the other hand.
  • the pivot lever is pivotable, counter to a force of the double leg spring, in a controlled manner by a cam of a cam shaft, on the one hand, and the pivot point by an adjustment installation for adjusting the stroke height is displaceable in a controlled manner parallel to the guideway track, on the other hand.
  • the double leg spring in the central region thereof forms an intermediate leg having a reversal of the rotation direction of the two spring legs, wherein the double leg spring is able to be assembled in the region of the intermediate leg.
  • variable-stroke valve drive having a double leg spring embodiment with spring legs in an S-bend, wherein the spring leg engages on the contact face on the pivot lever from “above” and when assembling has to be introduced into the lateral guide tabs of the pivot lever from “the rear”.
  • one or both legs of the spring legs may not be correctly introduced onto the contact face of the pivot lever, but bear laterally on the end faces of the lateral guide tabs.
  • the spring leg slides down laterally from the intermediate lever and then rubs on the cam shaft.
  • the variable stroke function of the variable-stroke valve drive is thus no longer guaranteed. This leads to wear on the cam shaft tube by the spring leg, and the cam shaft may break.
  • the contact of the spring legs of the double leg spring is modified, from a vertical arrangement (S-bend) to a horizontal arrangement.
  • the design embodiment according to the invention leads to improved assembling.
  • the L-shaped spring leg of the double leg spring needs only to be placed on the corresponding contact face of the intermediate lever.
  • no additional positioning of the spring leg is required, thus ruling out any assembly error.
  • FIG. 1 shows a perspective view of a portion of a generic variable-stroke valve drive according to the prior art
  • FIG. 2 shows a lateral view of a variable-stroke valve drive according to the invention in comparison to the prior art
  • FIG. 3 shows a perspective view of the variable-stroke valve drive according to the invention in comparison to the prior art.
  • FIG. 1 shows a perspective view of a portion of a generic variable-stroke valve drive 1 with a double leg spring 2 according to the prior art.
  • the portion is provided for two charge-cycle valves 9 , wherein only one charge-cycle valve 9 is provided with a reference sign.
  • This valve drive 1 can be installed in a cylinder head of an internal combustion engine (not illustrated) and is known from the prior art, i.e., DE 10 2006 033 559 A1.
  • the valve drive 1 comprises a pivot lever 3 which by way of a rolling element 4 having a pivot point is supported on a guideway track 5 of a guideway 6 , on the one hand, and by way of a control track 7 is supported so as to be clearance-free on an intermediate element 8 , a roller cam follower, to a charge-cycle valve 9 , on the other hand.
  • the intermediate element 8 in relation to the charge-cycle valve 9 is supported on a clearance compensation element 14 , preferably a hydraulic clearance compensation element 14 .
  • the pivot lever 3 In order for the stroke to be adjusted, the pivot lever 3 , counter to a force of the double leg spring 2 , is pivotable in a controlled manner between the support points of a cam (not illustrated) of a camshaft, on the one hand, and the pivot point of an adjustment installation 10 , an eccentric shaft, for adjusting the stroke height is displaceable in a controlled manner parallel to the guideway track 5 , on the other hand.
  • the double leg spring 2 in the central region thereof forms an intermediate leg 11 having a reversal of the rotation direction of the two spring legs 2 a , 2 b ( 2 b is not provided with the reference sign due to being invisible), wherein the intermediate leg 11 is encased by a sheet-metal assembly plate.
  • the double leg spring 2 is able to be fastened either to the cylinder head or to a shaft bearing (not illustrated).
  • a shaft bearing not illustrated.
  • the known double leg spring embodiment has spring legs 2 a , 2 b with an S-bend, wherein the spring legs 2 a , 2 b engage on the contact faces on the pivot lever 3 from “above” and when assembling are introduced into lateral guide tabs (not provided with a reference sign) of the pivot lever 3 from “the rear”.
  • FIG. 2 shows a lateral view of a variable-stroke valve drive 1 according to the invention in comparison to the prior art.
  • the same circumstances apply to FIG. 2 as to FIG. 1 .
  • the spring leg 2 a which is at the bottom in the drawing corresponds to the embodiment according to the prior art; the spring leg 2 b which is at the top in the drawing corresponds to the design embodiment according to the invention.
  • the end of the spring leg 2 b in this comparison is formed so as to be largely parallel to a longitudinal axis 12 of the double leg spring 2 .
  • the spring leg 2 b is formed toward the inside. In a further exemplary embodiment, the spring leg 2 b may also be formed toward the outside.
  • the spring leg 2 b in the present exemplary embodiment is formed by approx. 90°, larger or smaller forming angles also being possible here.
  • the pivot lever 3 for each end of the spring legs 2 a , 2 b according to the invention has one corresponding contact face 13 .
  • FIG. 3 shows a perspective view of the variable-stroke valve drive 1 according to the invention in comparison to the prior art. The same as has been discussed in the context of FIG. 2 applies. Finally, it is to be mentioned that both spring legs 2 a , 2 b of the double leg spring 2 in reality—and as opposed to FIGS. 2 and 3 -have the L-shape, and the pivot lever 3 has one contact face 13 for each spring leg 2 a , 2 b.
  • the design embodiment according to the invention leads to improved assembling.
  • the L-shaped spring leg 2 b of the double leg spring 2 needs only to be placed on the corresponding contact face 13 of the intermediate lever 3 .
  • no additional positioning of the spring leg 2 b is required, thus ruling out any assembly error.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US17/794,755 2020-01-23 2020-12-15 Variable-Stroke Valve Drive With a Double Leg Spring Abandoned US20230075127A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020101555.0 2020-01-23
DE102020101555.0A DE102020101555A1 (de) 2020-01-23 2020-01-23 Hubvariabler Ventiltrieb mit einer Doppelschenkelfeder
PCT/EP2020/086077 WO2021148199A1 (de) 2020-01-23 2020-12-15 Hubvariabler ventiltrieb mit einer doppelschenkelfeder

Publications (1)

Publication Number Publication Date
US20230075127A1 true US20230075127A1 (en) 2023-03-09

Family

ID=74105990

Family Applications (1)

Application Number Title Priority Date Filing Date
US17/794,755 Abandoned US20230075127A1 (en) 2020-01-23 2020-12-15 Variable-Stroke Valve Drive With a Double Leg Spring

Country Status (5)

Country Link
US (1) US20230075127A1 (de)
EP (1) EP4093951A1 (de)
CN (1) CN114729578A (de)
DE (1) DE102020101555A1 (de)
WO (1) WO2021148199A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040144347A1 (en) * 2001-05-12 2004-07-29 Bayerische Motoren Werke Aktiengesellschaft Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine
DE102006029178A1 (de) * 2006-06-24 2007-12-27 Bayerische Motoren Werke Ag Schlepphebel
US20160146066A1 (en) * 2013-06-25 2016-05-26 Pierburg Gmbh Spring arrangement for a variable valve drive of an internal combustion engine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10122152B4 (de) 2001-05-08 2005-07-21 Bayerische Motoren Werke Ag Montagehilfe und ein Verfahren zur Montage und Demontage für eine Schenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine
US6745734B2 (en) 2002-05-24 2004-06-08 Delphi Technologies, Inc. Variable valve actuating mechanism having torsional lash control spring
DE102006033559A1 (de) 2006-07-20 2008-01-24 Bayerische Motoren Werke Ag Hubvariabler Ventiltrieb für eine Brennkraftmaschine
DE102011082226A1 (de) 2011-09-07 2013-03-07 Bayerische Motoren Werke Aktiengesellschaft Doppelschenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine
DE102016220401A1 (de) 2016-10-18 2017-09-07 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220394B3 (de) 2016-10-18 2017-12-28 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220396A1 (de) 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016220397A1 (de) 2016-10-18 2017-08-10 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016223087A1 (de) 2016-11-23 2017-10-26 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016223086A1 (de) 2016-11-23 2018-05-24 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102016223088A1 (de) 2016-11-23 2018-05-24 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs
DE102017110171A1 (de) 2017-05-11 2018-11-15 Schaeffler Technologies AG & Co. KG Zwischenhebel eines variablen Ventiltriebs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040144347A1 (en) * 2001-05-12 2004-07-29 Bayerische Motoren Werke Aktiengesellschaft Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine
DE102006029178A1 (de) * 2006-06-24 2007-12-27 Bayerische Motoren Werke Ag Schlepphebel
US20160146066A1 (en) * 2013-06-25 2016-05-26 Pierburg Gmbh Spring arrangement for a variable valve drive of an internal combustion engine

Also Published As

Publication number Publication date
CN114729578A (zh) 2022-07-08
EP4093951A1 (de) 2022-11-30
DE102020101555A1 (de) 2021-07-29
WO2021148199A1 (de) 2021-07-29

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