DE4213855A1 - Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve - Google Patents

Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve

Info

Publication number
DE4213855A1
DE4213855A1 DE19924213855 DE4213855A DE4213855A1 DE 4213855 A1 DE4213855 A1 DE 4213855A1 DE 19924213855 DE19924213855 DE 19924213855 DE 4213855 A DE4213855 A DE 4213855A DE 4213855 A1 DE4213855 A1 DE 4213855A1
Authority
DE
Germany
Prior art keywords
valve
cam
opening
transmission element
cams
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.)
Ceased
Application number
DE19924213855
Other languages
German (de)
Inventor
Leopold Dipl Ing Mueller
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.)
Iav Motor Ingenieurgesell GmbH
Original Assignee
Iav Motor Ingenieurgesell GmbH
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 Iav Motor Ingenieurgesell GmbH filed Critical Iav Motor Ingenieurgesell GmbH
Priority to DE19924213855 priority Critical patent/DE4213855A1/en
Publication of DE4213855A1 publication Critical patent/DE4213855A1/en
Ceased 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
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the 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
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20Adjusting or compensating clearance
    • F01L1/22Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245Hydraulic tappets
    • F01L1/25Hydraulic tappets between cam and valve stem
    • 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
    • F01L13/0036Modifications 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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction

Abstract

The valve drive is for variable opening characteristics of esp. intake valves. It has a cam shaft with two different cams for each valve or group. There are two transmission elements associated with the cams, a first one for min. opening, and a second one for max. opening. The elements may be coupled by a controllable locking device. The base circle of the cam (2) for min. opening is dimensioned, so that when the elements (4,5) are coupled, the first one does not touch the cam. A conventional hydraulic tolerance compensation device (8) is located between the first element and each valve (9). The device has an adjusting path, so that the play of the transmission elements may be compensated to both cams. USE/ADVANTAGE - IC engine valve gear has automatic tolerance compensation for stroke transmission elements.

Description

The invention relates to a valve train for changeable Opening characteristics, preferably of intake valves, according to the Preamble of claim 1.

Valve drives of the aforementioned type are known from the documents DE-OS 35 26 543 and 37 01 408. Side by side are on the cam one cam each for low and maximum opening of one Valve or a pair of valves arranged. The transmission elements are designed as rocker arms mounted in the cylinder head. The first rocker arm engages the cam for little opening and opens the valve or valve pair only slightly. The second tilt lever on the cam for maximum opening moves without effect, as long as the locking device is not coupled to the first tilt lever produces. After coupling both rocker arms, the second one transmits Rocker arm the stroke of the cam for maximum opening at first Rocker arm and thus controls the valve. The first When coupled, the rocker arm is only in the area of parallel Ab cuts the base circles of both cams with its associated Cam in engagement. The locking device is in transit Base circuits switched, both for coupling and for decoupling.

The disadvantage is that with the ge to the valve or valves directed static lash adjusters - set screws - only for one of the stroke transmission chains - e.g. B. cams for little Open, first rocker arm, valve - the game optimally adjusted can be used for either minimal or maximum opening. Unfortunate thermal and wear-related play remains visible changes.

A valve train is also known from DE-OS 33 47 680 with one cam each for low and maximum valve opening, the cam for narrow valve opening in its width ge shares. Its cam halves are on both sides of the cam for maxi paint hub arranged, which engages a first plunger element. This first plunger element is slidably seated in a second sleeve  shaped plunger element, the annular end surface of the cams cover halves of cam for small valve opening. over its other closed end face is the second plunger element with a rocker arm actuating one or more valves in stroke direction in positive engagement.

The first is by means of a controllable hydraulic cushion Tappet element can be supported against the second tappet element, so that the stroke of the cam for maximum valve opening over the first Tappet element and the downstream rocker arm on the valve is transmitted. The first plunger element disengages with the cam halves of the cam for small valve opening, it there is a game.

Matters of equalization in alternative operation with the different cams and stroke transmission elements are in the previously discussed script not discussed.

The invention solves the problem in a valve train genus for both operating modes, so with less and maximum valve opening, automatic play compensation for to achieve the stroke transmission elements of the valve or valves.

According to the invention, this object is achieved by executing the Valve train with the characteristics of the features of the claim reached.

Due to the inevitable at low and maximum valve opening Effectiveness of each associated with the valve or valves hydraulic lash adjusters are the by pairing, Wear and thermal conditions caused games between each because acting hub transmission elements and alternatively control the cam safely balanced.

The game compensation device must with its compensation path Cover the sum of the games. At the same time, dampened over gears after switching the mechanical locking device and thus achieved for the change of the acting cam.

Exemplary embodiments of the invention are illustrated in the drawings explained. It shows:

1 shows a valve train at maximum stroke with mechanically locked transmission elements -. Position in a schematic Dar, - from out as a rocker arm

. Fig. 2 is a partial view of a valve gear of Figure 1, but (not shown; Stroke = 0) and unopened valve,

Fig. 3 shows a valve train at maximum stroke with mechanically locked transmission elements - out as a plunger - in a schematic representation.

A camshaft 1 is mounted in the cylinder head of an internal combustion engine. For the valve train according to the invention, it has a cam 3 for maximum valve opening for each valve or valve group to be controlled synchronously - preferably an inlet valve. The first 4 and the second transmission element 5 - each rocker arm - are independently pivotally mounted in the cylinder head on a rocker arm shaft 6 , but can be connected to each other via a locking device 7 in a specific angular position.

When the locking device is not switched on, the first transmission element 4 engages with the cam 2 and actuates the spring-loaded valve 9 via an intermediate hydraulic lash adjuster 8 .

The second, with the cam 3 in meshing element 5 is with the locking device 7 switched on with the transmission element 4 in a positive connection. So that the stroke of the cam 3 is transmitted from the transmission element 5 to the transmission element 4 and subsequently via the lash adjuster 8 to the valve 9 ; shown in Fig. 1 at maximum stroke. With effective locking device 7 between the transmission elements 4 ; 5 , the transmission element 4 disengages from its associated cam 2 . This also applies in the area of the parallel course of the base circles of both cams 2 ; 3 , see Fig. 2.

Fig. 3 shows another embodiment of a valve train according to the invention.

The camshaft 1 runs over the valves 9 , the transmission elements 4 ', 5 ' are designed as a plunger mounted in the cylinder head or one inside the other. The cam 2 is inactive locking device 7 'with the transmission element 4 in engagement, which via the hydraul. Spielausgleichsvorrich device 8 actuates the valve 9 and for this purpose in the transfer element 5 'moves. With effective locking device 7 '- shown schematically as a cross pin in Fig. 3 - the cam 3 determines the valve lift. From the transmission element 5 ', the transmission element 4 ' is taken. It moves over the hy metallic lash adjuster 8, the valve 9th

From both examples it can be seen that by means of the two cams 2 ; 3 effective game compensation device 8 balances the overall game in the respective acting chain of transmission elements.

Claims (1)

  1. Valve train for variable opening characteristics of valves, preferably intake valves, of internal combustion engines consisting of the following components:
    • - a camshaft with two cams of different contours for each valve or each synchronously operated valve group with several valves;
    • - A first transmission element between the cam for little opening and the valve or valve group to be actuated;
    • - A second transmission element, assigned to the cam for maximum opening;
    • a controllable mechanical locking device, by means of which both transmission elements can be coupled,
      characterized by the following features:
    • - The base circle of the cam ( 2 ) for slight opening is dimensioned so that with coupled transmission elements ( 4 , 5 , 4 ', 5 ') the first transmission element ( 4 , 4 ') does not touch it;
    • - Between the first transmission element ( 4 , 4 ') and each valve to be actuated ( 9 ) is a known hy metallic play compensation device ( 8 ) is arranged;
    • - The hydraulic lash adjuster ( 8 ) has such an adjustment path that the game of the transmission elements ( 4 , 5 , 4 ', 5 ') in the coupled and uncoupled state, that is to say both cams ( 2 , 3 ), can be compensated.
DE19924213855 1992-04-27 1992-04-27 Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve Ceased DE4213855A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924213855 DE4213855A1 (en) 1992-04-27 1992-04-27 Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924213855 DE4213855A1 (en) 1992-04-27 1992-04-27 Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve

Publications (1)

Publication Number Publication Date
DE4213855A1 true DE4213855A1 (en) 1993-10-28

Family

ID=6457606

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924213855 Ceased DE4213855A1 (en) 1992-04-27 1992-04-27 Valve drive for intake valves of IC engine - has hydraulic tolerance compensation device between stroke transmission element and valve

Country Status (1)

Country Link
DE (1) DE4213855A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4329590A1 (en) * 1993-09-02 1995-03-09 Bayerische Motoren Werke Ag Valve gear with tappet device for variable valve lift timing, especially for an inlet and exhaust valve of an internal combustion engine
US5431133A (en) * 1994-05-31 1995-07-11 General Motors Corporation Low mass two-step valve lifter
DE19544527A1 (en) * 1994-11-30 1996-06-05 Aisin Seiki Valve control device for internal combustion engines
DE19622174A1 (en) * 1995-12-13 1997-06-26 Porsche Ag Valve train of an internal combustion engine
DE19729198A1 (en) * 1997-07-09 1999-01-14 Deutz Ag Brake device for internal combustion engine
DE4492633C1 (en) * 1993-05-04 2001-05-31 Schaeffler Waelzlager Ohg Valve lifter for IC engine
DE10220904A1 (en) * 2002-05-10 2003-11-27 Meta Motoren Energietech Device for adjusting the stroke of a valve actuated by a camshaft
DE4411182B4 (en) * 1994-03-31 2004-04-08 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Switchable valve control for internal combustion engines
DE4499784B4 (en) * 1993-12-17 2006-09-21 Schaeffler Kg supporting
DE102006029156A1 (en) * 2006-06-24 2007-12-27 Daimlerchrysler Ag Valve drive play minimizing device for internal-combustion engine, has transmission unit with operable lever parts coupled with each other, where lever parts are designed in partial plastic deformable manner
CN108757083A (en) * 2018-05-25 2018-11-06 温州职业技术学院 A kind of variable valve actuator for air of hydraulic-driven

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4768475A (en) * 1986-02-28 1988-09-06 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an automotive engine
DE3904681A1 (en) * 1989-02-16 1990-08-23 Bayerische Motoren Werke Ag Device for the variable timing of the same type of lift valve for each combustion chamber of an internal combustion engine
DE4202506A1 (en) * 1991-02-12 1992-08-13 Volkswagen Ag Variable lift valve drive - has secondary pressure chamber and cams
DE4213147A1 (en) * 1991-05-03 1992-11-05 Volkswagen Ag Variable drive for double tappet valve - has raised extension of one tappet fitting inside other

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4768475A (en) * 1986-02-28 1988-09-06 Fuji Jukogyo Kabushiki Kaisha Valve mechanism for an automotive engine
DE3904681A1 (en) * 1989-02-16 1990-08-23 Bayerische Motoren Werke Ag Device for the variable timing of the same type of lift valve for each combustion chamber of an internal combustion engine
DE4202506A1 (en) * 1991-02-12 1992-08-13 Volkswagen Ag Variable lift valve drive - has secondary pressure chamber and cams
DE4213147A1 (en) * 1991-05-03 1992-11-05 Volkswagen Ag Variable drive for double tappet valve - has raised extension of one tappet fitting inside other

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4492633C1 (en) * 1993-05-04 2001-05-31 Schaeffler Waelzlager Ohg Valve lifter for IC engine
DE4329590B4 (en) * 1993-09-02 2005-01-27 Bayerische Motoren Werke Ag Valve train with plunger device for variable valve lift control, in particular for a gas exchange valve of an internal combustion engine
DE4329590A1 (en) * 1993-09-02 1995-03-09 Bayerische Motoren Werke Ag Valve gear with tappet device for variable valve lift timing, especially for an inlet and exhaust valve of an internal combustion engine
DE4499784B4 (en) * 1993-12-17 2006-09-21 Schaeffler Kg supporting
DE4411182B4 (en) * 1994-03-31 2004-04-08 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Switchable valve control for internal combustion engines
US5431133A (en) * 1994-05-31 1995-07-11 General Motors Corporation Low mass two-step valve lifter
DE19544527A1 (en) * 1994-11-30 1996-06-05 Aisin Seiki Valve control device for internal combustion engines
DE19622174A1 (en) * 1995-12-13 1997-06-26 Porsche Ag Valve train of an internal combustion engine
DE19729198A1 (en) * 1997-07-09 1999-01-14 Deutz Ag Brake device for internal combustion engine
DE10220904A1 (en) * 2002-05-10 2003-11-27 Meta Motoren Energietech Device for adjusting the stroke of a valve actuated by a camshaft
DE10220904B4 (en) * 2002-05-10 2005-04-07 Meta Motoren- Und Energie-Technik Gmbh Device for adjusting the stroke of a valve actuated by a camshaft
US6923151B2 (en) 2002-05-10 2005-08-02 Meta Motoren-Und Energie-Technik Gmbh Apparatus for the adjustment of the stroke of a valve actuated by a camshaft
DE102006029156A1 (en) * 2006-06-24 2007-12-27 Daimlerchrysler Ag Valve drive play minimizing device for internal-combustion engine, has transmission unit with operable lever parts coupled with each other, where lever parts are designed in partial plastic deformable manner
CN108757083A (en) * 2018-05-25 2018-11-06 温州职业技术学院 A kind of variable valve actuator for air of hydraulic-driven
CN108757083B (en) * 2018-05-25 2020-01-10 温州职业技术学院 Hydraulically-driven variable valve mechanism

Similar Documents

Publication Publication Date Title
DE102017101792A1 (en) Variable valve train of a combustion piston engine
US5345904A (en) Valve control means
US6941910B2 (en) Adjustable valve control system with twin cams and cam lift summation lever
US5289806A (en) Combustion engine with at least one camshaft which can be shifted axially
EP1172528B1 (en) Valve drive device of four-stroke cycle engine
US6668775B2 (en) Lock-pin cartridge for a two-step finger follower rocker arm
US4203397A (en) Engine valve control mechanism
JP4047542B2 (en) Engine valve actuation system
EP1387928B1 (en) Gas driving device for variable adjustment of the lift of a gas exchange valve of an internal combustion engine
JP4017705B2 (en) Dual event valve control system
JP4733630B2 (en) Variable valve lift control system for combustion engine with under nice camshaft
US4844023A (en) Valve operating device for internal combustion engine
JP2810442B2 (en) Engine Valve Actuator
EP2653673A1 (en) A switchable rocker arm
US6615782B1 (en) Two-step finger follower rocker arm
US5501186A (en) Engine valve control mechanism
DE3613912C2 (en)
EP0781900B1 (en) Latchable rocker arm mounting
US6691657B2 (en) Two-step finger follower rocker arm
JP2838440B2 (en) Engine valve variable control method and apparatus
US5253621A (en) Valve control means
EP1426569B1 (en) Engine with variable valve mechanism
US8312849B2 (en) Dual intake valve system with one deactivation valve and one multi-lift valve for swirl enhancement
US6311659B1 (en) Desmodromic cam driven variable valve timing mechanism
DE10312961B3 (en) Valve operating device for multi-cylinder IC engine e.g. for automobile, with setting movement of rotation axis for intermediate cam elements for adjusting valve operation

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8110 Request for examination paragraph 44
8131 Rejection