EP1377732B1 - Verbindung zwischen einem schaftende eines gaswechselventils einer brennkraftmaschine und einem hülsenförmigen stellkolben eines ventilstellers - Google Patents

Verbindung zwischen einem schaftende eines gaswechselventils einer brennkraftmaschine und einem hülsenförmigen stellkolben eines ventilstellers Download PDF

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Publication number
EP1377732B1
EP1377732B1 EP02729823A EP02729823A EP1377732B1 EP 1377732 B1 EP1377732 B1 EP 1377732B1 EP 02729823 A EP02729823 A EP 02729823A EP 02729823 A EP02729823 A EP 02729823A EP 1377732 B1 EP1377732 B1 EP 1377732B1
Authority
EP
European Patent Office
Prior art keywords
piston
sleeve
wedge
connection according
actuating piston
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.)
Expired - Lifetime
Application number
EP02729823A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1377732A1 (de
Inventor
Uwe Hammer
Sevan Tatiyosyan
Volker Beuche
Peter Lang
Stefan Reimer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1377732A1 publication Critical patent/EP1377732A1/de
Application granted granted Critical
Publication of EP1377732B1 publication Critical patent/EP1377732B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/10—Connecting springs to valve members
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7062—Clamped members
    • Y10T403/7064—Clamped members by wedge or cam
    • Y10T403/7066—Clamped members by wedge or cam having actuator
    • Y10T403/7067—Threaded actuator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7062—Clamped members
    • Y10T403/7064—Clamped members by wedge or cam
    • Y10T403/7066—Clamped members by wedge or cam having actuator
    • Y10T403/7067—Threaded actuator
    • Y10T403/7069—Axially oriented

Definitions

  • the invention is based on a connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuating piston of a valve actuator, according to the preamble of claim 1.
  • connection is from the DE 198 26 046 A1 known, with at least two the shaft end enclosing, on the adjusting piston axially supporting, shell-shaped wedge pieces whose radially outer peripheral surface is conical and which are surrounded by a Konusspannhülse whose radially inner peripheral surface extends complementary to the cone angle of the wedge pieces and which against this is axially braced by a screwed onto the shaft end nut.
  • an annular projection is provided which engages in an annular groove on the radially outer peripheral surface of the shaft end.
  • the actuating piston is formed by a differential piston, which can slide up and down within a cylinder housing of the valve actuator depending on the pressurization of its front-facing piston surfaces facing away from each other. Due to the relatively high number of components to be assembled results in this connection, however, a high production cost, also builds the connection is relatively large.
  • the Konusspannhülse is formed according to the invention by the actuating piston, this performs a dual function by attacking him on the one hand, the hydraulic actuating forces and on the other hand, provides for the axial clamping of the cone connection, whereby a separate Konusspannhülse can be omitted.
  • the threaded portions serving for the tensioning of the conical connection are designed according to the invention on the adjusting piston and on the wedge pieces, so that it is also possible to dispense with a clamping nut.
  • the consequently reduced number of connecting components simplifies and shortens the assembly, and in addition reduces the space required for the connection, and finally also the weight of the connection is reduced.
  • the connection through an opening in the valve actuator housing from the combustion chamber remote outside is easily accessible. Because the valve stem for mounting the compound therefore does not have to protrude from the opening, in particular gas exchange valves with short stems and a consequently low inertia can be used.
  • connection radially enclosed by the actuating piston and a pressurized hydraulic fluid is arranged on a radially outer region of the actuating piston. Then the connection is not in the pressure range, so that the hydraulic circuit of the pressure range does not have to be opened when a loosening of the connection, for example, for repair purposes is necessary.
  • the wedge pieces seen in the circumferential direction join each other without a gap and complement each other to form a circumferential wedge sleeve whose inner diameter is slightly larger than the outer diameter of the shaft end of the gas exchange valve and that the projections and recesses interlock with little play.
  • a play-related, positive connection is created by which concentricity errors between the valve seat and the guidance of the valve stem in the valve actuator can be compensated.
  • rotational movements of the shaft end are allowed relative to the actuating piston.
  • the adjusting piston does not have to rotate with the gas exchange valve to allow the known by regular rotation of the gas exchange valve around its longitudinal axis advantages such as a homogenization of the valve wear or a free attitude of the valve seat of deposits, so that the sealing function of the actuating piston is not affected.
  • the actuating piston is formed in two parts and includes a combustion chamber near closing piston and this axially adjoining and working in opposite directions, combustion chamber remote opening piston, wherein the conical portion and the threaded portion are arranged on the opening piston.
  • the adjusting piston can also be designed as a one-piece differential piston.
  • the number of components is further reduced and the length of the gas exchange valve stem can be even smaller because of the then shorter executable actuating piston.
  • a valve train of an internal combustion engine is in Fig.1 for reasons of scale, only one gas exchange valve 1 is shown, which is actuated by an actuating piston 2 of a valve actuator 4 such that it performs up and down opening and closing movements.
  • the actuating piston 2 extends substantially from a bottom opening 6 of a valve housing 8 of the valve actuator 4 close to the combustion chamber to a bore 14 formed in a cover 12 placed on an upper opening 10 of the actuator housing 8 and, according to a preferred embodiment, comprises two counter-rotating pistons, a combustion chamber near sleeve-shaped closing piston 16 and a this axially adjoining combustion chamber remote and also sleeve-shaped opening piston 18.
  • the closing piston 16 and the opening piston 18 surround a shaft 20 of the gas exchange valve 1 with radial distance coaxially.
  • the shaft 20 of the gas exchange valve 1 extends from a cylinder head of the internal combustion engine, not shown, through the bottom opening 6 into the interior of the actuator housing 8, wherein a shaft end 22 is axially spaced from the bore 14 in the cover 12.
  • the closing piston 16 defines a lower working space 28 and a sleeve pushed onto the opening piston 18 with a ring area 24 of a first radially outer shoulder 26 close to the combustion chamber 29 with an upper annular surface 30 of a second radially outer shoulder 32 an upper working space 34, wherein the working spaces 28, 34 through in Fig.1 not shown channels can be filled or relieved with a pressure medium.
  • Both pistons 16, 18 are also axially guided by means of a pressed-in the actuator housing 8 bushing 36.
  • a seal 38 in the region of the bore 14 of the cover 12 and a seal 40 in the region of the bottom opening 6 of the actuator housing 8 ensure an axial sealing of the two working chambers 28, 34.
  • a connection 42 between the shaft end 22 of the gas exchange valve 1 and the opening piston 18 includes two shaft end 22 enclosing, shell-shaped wedge pieces 44, 46, which complement each other to a circumferential wedge sleeve 48, from which the radially outer peripheral surface of a combustion chamber near section 50 in one of Combustion chamber pointing away direction conically tapered.
  • This conical portion 50 of the wedge sleeve 48 is followed by a cylindrical portion 52 with an external thread 54, which in turn terminates in a section 56 with a preferably formed as a square 58 lug surface for a screwing.
  • a radially inner peripheral surface of a combustion chamber near portion 60 of the opening piston 18 extends complementary to the cone angle of the wedge sleeve 48, in addition, this section 60 axially adjoining threaded portion 62 is provided with a screwed to the external thread 54 of the wedge sleeve 48 internal thread 64.
  • the threaded portion 62 of the opening piston 18 is followed by a cylindrical, radially spaced from the square 58 of the wedge sleeve 48 section 66, which has on its radially inner peripheral surface preferably designed as a hexagon 68 approach surface for a screwing.
  • the radial distance of the Square 58 of the hexagon socket 68 is sufficiently large so that the square 58 can attack a screwing tool.
  • connection 42 On the radially inner circumferential surface of the wedge sleeve 48 and on the radially outer circumferential surface of the shaft end 22 of the gas exchange valve 1 interlocking projections 70 and recesses 72 are provided to produce a positive connection 42.
  • the connection 42 is radially enclosed by the opening piston 18 and shielded from it by a radially outer hydraulic area containing the lower and upper working spaces 28, 34.
  • the wedge sleeve 48 on the radially inner peripheral surface of the conical section three equidistantly axially behind each other, each extending in the circumferential direction Ringwülste 70, each of which engages an associated, formed in the shaft end 22, circumferential annular groove 72.
  • the annular beads 70 and annular grooves 72 have a substantially semicircular cross section, wherein the inner radius of the annular grooves 72 is preferably larger by a few hundredths of a millimeter than the outer radius of the annular beads 70.
  • the actuator housing 8 with preassembled bushing 36, preassembled closing piston 16 and preassembled seal 40 is first placed on the cylinder head of the internal combustion engine, wherein the shaft 20 of the gas exchange valve 1 is passed through the closing piston 16 from below , Subsequently, the two wedge pieces 44, 46 are placed through the upper opening 10 of the actuator housing 8 on the shaft end 22 and the opening piston 18 screwed from above onto the thus formed wedge sleeve 48 by a Square key to prevent rotation on the square 58 of the wedge sleeve 48 is placed and at the same time a hex wrench is inserted into the hexagon socket 68 of the opening piston 18, as shown by Fig.2 is easy to imagine.
  • the hex key In order to enable a simultaneous application of tools, the hex key must have a central through hole for the shaft of the square socket wrench.
  • the wedge pieces 44, 46 are braced radially relative to one another and, because of the form-fitting interlocking projections 70 and recesses 72, the shank end 22 is drawn into the conical section 60 of the opening piston 18.
  • a combustion chamber near, the shaft end 22 radially superior annular surface 74 on the front side of the wedge sleeve 48 then forms an axial stop surface for the closing piston 16, between this and the opening piston 18, a narrow axial gap 76 remains, so that the two pistons 16, 18 not with each other are connected.
  • the wedge pieces 44, 46 in the circumferential direction join each other without a gap and flush and complement each other to the circumferential wedge sleeve 48 whose inner diameter is slightly larger than the outer diameter of the shaft end 22 of the gas exchange valve 1 and because the projections 70 and recesses 72 also with play into each other can grasp no frictional contact between the peripheral surface of the shaft end 22 of the gas exchange valve 1 and the radially inner peripheral surface of the wedge sleeve 48 form, which would be sufficient to prevent rotational movements of the shaft end 22 relative to the screwed with the opening piston 18 wedge sleeve 48 can.
  • the gas exchange valve 1 remains freely rotatable relative to the valve actuator 4.
  • the diameter difference between the inner diameter of the wedge sleeve 48 and the outer diameter of the shaft end 22 of the gas exchange valve 1 is preferably a few hundredths of a millimeter.
  • valve actuator 4 is as follows: Starting from the in Fig.1 shown opening position is applied to close the gas exchange valve 1, the lower working chamber 28 with pressure and at the same time the upper working chamber 34 relieved of pressure, so that the closing piston 16 moves upward and via the annular surface 74 of the wedge sleeve 48 and the connection 42 the opening piston 18 entrains, so that this can drive out of the bore 14 in the lid 12. Conversely, to open the gas exchange valve 1, the upper working chamber 34 is pressurized and at the same time depressurizes the lower working chamber 28, whereby the downwardly compressed opening piston 18 entrains the closing piston 16 via the connection 42 and the annular surface 74 of the wedge sleeve 48.
  • the power flow from the opening piston 18 to the shaft end 22 runs mainly on the interlocking projections 70 and recesses 72 in a form-fitting manner, while the axially offset, threaded threaded portions 52, 62 serve only the radial cohesion of the wedge pieces 44, 46, so that they are essentially exposed to no dynamic loads.
  • the parts that are the same and function the same as in the previous example are identified by the same reference numerals.
  • the actuating piston 2 is formed as a one-piece differential piston 78, which is in the open position of the gas exchange valve. 1 extends from the combustion chamber near bottom opening 6 of the actuator housing 8 to the bore 14 in the cover 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP02729823A 2001-03-30 2002-03-27 Verbindung zwischen einem schaftende eines gaswechselventils einer brennkraftmaschine und einem hülsenförmigen stellkolben eines ventilstellers Expired - Lifetime EP1377732B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10116218A DE10116218A1 (de) 2001-03-30 2001-03-30 Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem hülsenförmigen Stellkolben eines Ventilstellers
DE10116218 2001-03-30
PCT/DE2002/001125 WO2002079612A1 (de) 2001-03-30 2002-03-27 Verbindung zwischen einem schaftende eines gaswechselventils einer brennkraftmaschine und einem hülsenförmigen stellkolben eines ventilstellers

Publications (2)

Publication Number Publication Date
EP1377732A1 EP1377732A1 (de) 2004-01-07
EP1377732B1 true EP1377732B1 (de) 2008-02-13

Family

ID=7679987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02729823A Expired - Lifetime EP1377732B1 (de) 2001-03-30 2002-03-27 Verbindung zwischen einem schaftende eines gaswechselventils einer brennkraftmaschine und einem hülsenförmigen stellkolben eines ventilstellers

Country Status (6)

Country Link
US (1) US6729287B2 (ja)
EP (1) EP1377732B1 (ja)
JP (1) JP4083022B2 (ja)
KR (1) KR20030065312A (ja)
DE (2) DE10116218A1 (ja)
WO (1) WO2002079612A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10141176A1 (de) * 2001-08-22 2003-03-20 Bosch Gmbh Robert Lösbare Verbindung zum Kuppeln eines Gaswechselventils einer Brennkraftmaschine mit einem Aktor
US7455798B2 (en) * 2002-08-23 2008-11-25 James Hardie International Finance B.V. Methods for producing low density products
DE10256242A1 (de) * 2002-12-02 2004-06-09 Robert Bosch Gmbh Ventilsteller zur Betätigung eines Gaswechselventils einer Brennkraftmaschine
DE10321157A1 (de) 2003-05-12 2004-12-02 Robert Bosch Gmbh Ventilsteller zur Betätigung eines Gaswechselventils einer Brennkraftmaschine
AT501335B1 (de) * 2005-01-19 2007-05-15 Avl List Gmbh Ventilbetätigungseinrichtung
DE202009017700U1 (de) * 2009-11-18 2010-06-02 Daude, Otto, Dr.-Ing. MBA Gegenkolbenmotor mit Gaswechselsteuerung über hydrostatisch bewegte Schiebebüchsen
DE102019207536A1 (de) * 2019-05-23 2020-11-26 Mahle International Gmbh Gaswechselventil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR931101A (fr) * 1945-07-23 1948-02-13 Eaton Mfg Co Perfectionnements apportés à une soupape pour moteur à combustion interne
US5003940A (en) * 1990-07-25 1991-04-02 Hixson William J Quick adjust tappet assembly
DE4117406A1 (de) * 1991-05-28 1992-12-03 Freudenberg Carl Fa Ventiltrieb im zylinderkopf einer verbrennungskraftmaschine
US5231959A (en) * 1992-12-16 1993-08-03 Moog Controls, Inc. Intake or exhaust valve actuator
US5701930A (en) * 1995-05-01 1997-12-30 Russell; Robert L. Modular valve assembly
SE511768C2 (sv) * 1998-02-23 1999-11-22 Atlas Copco Rocktech Ab Anordning och förfarande för skarvning av stänger, samt kolvpump innefattande anordningen
DE19826046A1 (de) 1998-06-12 1999-12-16 Bosch Gmbh Robert Ventilsteuerungsvorrichtung für eine Brennkraftmaschine
DE10040114A1 (de) * 2000-08-17 2002-02-28 Bosch Gmbh Robert Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem Stellglied eines Ventilstellers

Also Published As

Publication number Publication date
US20030177995A1 (en) 2003-09-25
KR20030065312A (ko) 2003-08-06
DE10116218A1 (de) 2002-10-10
DE50211673D1 (de) 2008-03-27
US6729287B2 (en) 2004-05-04
EP1377732A1 (de) 2004-01-07
JP4083022B2 (ja) 2008-04-30
WO2002079612A1 (de) 2002-10-10
JP2004518893A (ja) 2004-06-24

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