DE19728100B4 - Switchable plunger for a valve train of an internal combustion engine - Google Patents

Switchable plunger for a valve train of an internal combustion engine

Info

Publication number
DE19728100B4
DE19728100B4 DE19728100A DE19728100A DE19728100B4 DE 19728100 B4 DE19728100 B4 DE 19728100B4 DE 19728100 A DE19728100 A DE 19728100A DE 19728100 A DE19728100 A DE 19728100A DE 19728100 B4 DE19728100 B4 DE 19728100B4
Authority
DE
Germany
Prior art keywords
plunger
ring
annular
circular
radially
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
DE19728100A
Other languages
German (de)
Other versions
DE19728100A1 (en
Inventor
Michael Dipl.-Ing. Haas
Wilfried Huber
Mario Dipl.-Ing. Kuhl
Gerhard Dr.-Ing. Maas
Barbara Meder
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and 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 AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to DE19728100A priority Critical patent/DE19728100B4/en
Publication of DE19728100A1 publication Critical patent/DE19728100A1/en
Application granted granted Critical
Publication of DE19728100B4 publication Critical patent/DE19728100B4/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/14Tappets; Push rods
    • F01L1/143Tappets; Push rods for use with overhead camshafts
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00Manufacturing of components used in valve arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2307/00Preventing the rotation of tappets

Abstract

Switchable plunger (1) for a valve drive of an internal combustion engine for charging at least one gas exchange valve, having the following features:
a) the plunger (1) has an outer annular portion (2) which acted upon by one or two cams stroke bottom (3 a) and radially outwardly a feasible in a receiving bore of a cylinder head shirt (3) and radially inside a guiding approach ( 32);
b) the annular portion (2) includes with its guide projection (32) concentric with a relative to this axially movable, circular portion (4) whose bottom (5) is acted upon by a cam smaller or 0-stroke;
c) immediately below the bottoms (3a, 5) of the sections (2, 4) extending radially formations (11, 12), in which in a Nockengrundkreisphase mutually aligned receptacles (7, 8) for coupling means (9) for coupling the sections (2, 4) are arranged on the cam large stroke;
d) in the circular section (4) is acting on the gas exchange valve hydraulic lash adjuster ...

Description

  • Territory of invention
  • The The invention relates to a switchable plunger for a valve train of an internal combustion engine for applying at least one gas exchange valve, with an outer annular portion, the a circular one Includes section the sections over radially or secantially displaceable coupling means with each other can be coupled.
  • background the invention
  • A generic switchable pestle goes out of the DE 195 15 284 A1 out. This also has immediately below bottoms of its sections radially extending formations with recordings for coupling agent. In the shirt two opposing passages for hydraulic means are applied, of which a passage leads into a lying below the bottom of the annular portion storage space and from there a transition to a hydraulic clearance compensation element in the inner element is shown. To limit the storage space in the distance from the floor, a ring part from "below" is brought to the formation of the annular portion which is merely applied or snapped radially outward with its sleeve portion to an inner shell of the shirt of the outer portion.
  • From the other, opposite passage in the shirt goes a weird Channel through a separate rib or through the in this area made of solid material annular section to another Channel in front of the coupling means in the circular section. These coupling agents communicate thus only in a small cam contact window (base circle) with the channel in the outer section.
  • The document mentioned above DE 195 15 284 A1 are no measures a simple, stationary and oil-tight attachment of the ring member with its sleeve section removed, which can be mass-produced.
  • adversely it is also in the aforementioned ram, that this is relatively massive and complicated; solid in particular by the rib or the solid material for passage the aforementioned oblique Channels in the outer section. This is thus not symmetrical or mirror-symmetrical, what's his mass production unnecessary more expensive and mass increased relatively strong.
  • An elaborate double-walled ring part also goes from the DE 44 43 101 A1 out. The double wall increases unnecessarily the weight and thus the oscillating valve train masses and on the other hand is expected to increase production costs. On the other hand, it should be noted that no hydraulically separate supply of the lash adjuster and the coupling means is realized.
  • A switchable bucket tappet with two secant coupling mechanisms discloses the DE 43 33 927 A1 , This has because of the two shots in the ground area an unnecessarily complicated, only consuming to be presented in mass production structure and is greatly increased in terms of its mass. Circumferentially distributed a plurality of storage spaces for hydraulic means are arranged, which is valid against each other and to the outside (cam-distal direction) to seal. This is complex, with no further suggestions being given.
  • task The invention is to provide a switchable plunger in which the mentioned disadvantages are eliminated and which plunger in particular a simple and cheap to assemble in mass production Ring part for safe separation of the supply of hydraulic means to Having the coupling means and the hydraulic clearance compensation element.
  • Summary the invention
  • at that in claim 1 or in the claims 2, 3 described switchable plunger is fulfilled this task.
  • It is a simple and mass production in terms of his Fixing well controllable ring part before, under simultaneous warranty a simply constructed, separate and therefore double-flow supply from hydraulic fluid to the corresponding customers in the ram. Circular ring-shaped storage spaces for the hydraulic medium, which is almost over 180 degrees extend, are on both sides of the formations for the coupling means in the circular Section made. The outer tappet is in terms of its mass the well-known from the former document plunger clearly reduced and lets in mass production cheap manufacture.
  • As such, there is the danger that in the radially outer and inner edge regions of the annular part at the radial formation an undesired fluid connection can be established from one storage space to another on the basis of geometrical and manufacturing conditions. By inventively proposed radial Verschwei ßung or the introduced sealing paste, the solder or the sintered powder according to the alternative claims 2, 3 is a good hydraulic separation of the circular ring-shaped storage spaces, in particular in the critical edge region proposed.
  • The for example listed Lot, which through openings of the ring part can be introduced, spreads after a heat treatment in the sealed room.
  • Likewise it is intended, only the edge portions of the ring member with a point or similar welding sealingly connect with the formations or the shirt, so that in the unequal with respect to its radii edge area a hydraulic medium is prevented.
  • It is the subject of the invention, the ring part in the region of the molding to be provided with a groove. In this groove can also sealant, as mentioned above, introduced for hydraulikmitteldichten separation of the storage rooms become.
  • The listed sealing measures can optionally before or after a heat treatment process be applied applied to the formation of the annular part.
  • Advantageous It is true if the passages for the separate channels to the individual, circular ring-shaped storage rooms itself seen in plan view of the plunger diametrically opposed, however, an offset is also conceivable.
  • Short description the drawing
  • The Invention is suitably closer to the drawing explained. Show it:
  • 1 a longitudinal section through a plunger with inventive ring part in the region of the coupling means;
  • 2 a longitudinal section after 1 , but rotated by 90 °;
  • 3 an annular portion of the plunger, for example, with a solder as a sealant in the region of edges of the ring member;
  • 4 an annular portion of the plunger as mentioned above, with a seal as a sealant and the
  • 5 a sectional view along the section line of 4 with a groove in the ring part for the solder or the like.
  • Full Description of the drawing
  • 1 discloses a pestle 1 in longitudinal section, as he is known in the art. The pestle 1 consists of an outer annular section 2 which section 2 in the area of his soil 3a is acted upon by one or two cams large stroke. Radially outside has the annular portion 2 a hollow cylindrical shirt 3 , With this shirt 3 is the pestle 1 longitudinally movably received in a bore of a cylinder head, not shown. The circular section 2 concentrically encloses a circular section 4 one. The circular section 4 is in the area of its soil 5 acted upon by a cam smaller stroke, whereby it can also be contacted by a cam 0-Hubes or by no cam.
  • Inside the circular section 5 is a hydraulic lash adjuster 6 arranged, which acts directly on one or more gas exchange valves in the hoist. In the circular and circular section 2 . 4 run in a Grundkreisphase mutually aligned recordings 7 . 8th for coupling agent 9 , These shots 7 . 8th are in the field of soils 3a . 5 arranged. A shift of the coupling agent 9 , shown here as a piston, in the direction of a stop element 10 , causes a coupling of the plunger 1 on the stroke of the big cams. At the in 1 Uncoupling position shown would be the plunger 1 just follow the stroke of the cam, which is the circular section 4 assigned.
  • The above recordings 7 . 8th for the coupling agent 9 run in from the floors 3a . 5 outgoing, radially extending formations 11 . 12 , In the cross section of the plunger 1 seen limit the formations 11 of the annular portion 2 two circular cut-out storage rooms 13 . 14 ( 13 first and 14 second storage space) for hydraulic means. It shows 2 that in the shirt 3 two separate passages 15 . 16 ( 15 first and 16 second passage) are arranged. These passages 15 . 16 serve a separate supply of hydraulic fluid on the one hand to the coupling means 9 and on the other hand to the hydraulic lash adjuster 6 ,
  • Inside the circular section 2 (Sat. 1 ) is a thin-walled ring part 17 , For example, produced by thermoforming, arranged. This ring part 17 is in the cam direction against the formations 11 of the annular portion 2 created. In the ground-facing direction and radially outward goes the ring part 17 in a sleeve 18 above. The sleeve 18 is largely liquid-tight on the inner shell 19 of the shirt 3 at. Thus, the ring part limited 17 below the ground 3 the first and second pantries 13 . 14 in cam-distant direction.
  • Starting from the first passage 15 (please refer 2 ) is in the sleeve 18 of the ring part 17 a first channel 20 formed in the axial direction. This channel 20 opens on the cam side in the first pantry 13 , Starting from this first pantry 13 is an unspecified transfer 21 (please refer 1 ) for the hydraulic fluid before the coupling agent 9 realized.
  • Diametrically the first passage 15 Opposite is in the shirt 3 axially to the first passage 15 in the cam direction, the second passage increases 16 , This second passage 16 flows into the second storeroom 14 , Starting from the second pantry 14 is a supply line for the hydraulic fluid to the clearance compensation element 6 between an internal leadership approach 32 of the annular portion 2 and a voltage applied to the outer jacket annular collar 58 of the ring part 17 created.
  • The ring part 17 is very simple and at the same time has a double-flow supply for the separate application of the play compensation element 6 and the coupling agent 9 Furthermore, despite its one-piece a good hydraulic medium density separation of the circular ring-shaped storage spaces 13 and 14 created so that the hydraulic fluid located in these do not emerge undesirable or in the other storage space 14 . 13 can transgress.
  • In previously performed ring parts 17 was in particular a transfer of the hydraulic fluid in the region of the respective formation 11 adjacent ring part 17 in particular on the outer or inner edge 22 . 23 determine. In these areas, it proves to be extremely unfavorable, the radii of the ring part 17 those of the opposite plunger 1 adapt.
  • 3 shows that the ring part 17 in its radially inner or outer edge region 45 . 46 with openings 47 is provided. Here only the critical edge area becomes 45 . 46 sealed. Between the ring part 17 and the shape 11 Can be used as a sealant 28 for hydraulic medium-tight separation of the storage rooms 13 . 14 Sealing paste, a lot 48 be brought, inter alia. This in turn can optionally before or after a heat treatment process for the ring member 17 will be realized.
  • 4 shows that the ring part 17 in the edge area 46 . 45 to the sleeve 18 and to the collar 58 by means of a welding 49 is sealingly attached. Also, it is conceivable the whole at the molding 11 adjacent area of the ring part 17 durchzuschweißen.
  • The 5 shows a partial section along the section line of the figure 12 , The ring part 17 has in the field of shaping 11 a groove 51 , This groove 51 can have a passage on each side 52 have. Through this passage 52 It is possible, a solder, sealing paste or sintering powder 48 or the like as a sealant 28 for hydraulic medium-tight separation of the storage rooms 13 . 14 contribute.
  • 1
    tappet
    2
    circular section
    3
    shirt
    3a
    ground
    4
    circular section
    5
    ground
    6
    hydraulic
    Lash adjuster
    7
    admission
    8th
    admission
    9
    coupling means
    10
    stop element
    11
    formation
    12
    formation
    13
    first pantry
    14
    second pantry
    15
    first passage
    16
    second passage
    17
    ring part
    18
    shell
    19
    inner sheath
    20
    first channel
    21
    crossing
    22
    outer edge
    23
    inner edge
    26
    second channel
    28
    sealant
    32
    leadership approach
    45
    internal edge region
    46
    outer edge area
    47
    opening
    48
    Sealing paste, Solder, sinter powder
    49
    penetration
    51
    fillet
    52
    passage
    56
    cam remote page
    57
    outer sheath
    58
    collar

Claims (3)

  1. Switchable plunger ( 1 ) for a valve drive of an internal combustion engine for acting upon at least one gas exchange valve, having the following features: a) the plunger ( 1 ) has an outer annular portion ( 2 ), which acts on a floor of one or two cams ( 3a ) and radially outward in a receiving bore of a Zylin derkopfes feasible shirt ( 3 ) and radially inside a guiding approach ( 32 ); b) the annular portion ( 2 ) concludes with its leadership approach ( 32 ) concentrically relative to this axially movable, circular portion ( 4 ) whose bottom ( 5 ) is acted upon by a cam smaller or zero stroke; c) immediately below the soil ( 3a . 5 ) of the sections ( 2 . 4 ) extend radially formations ( 11 . 12 ), in which in a cam base circle phase mutually aligned recordings ( 7 . 8th ) for coupling agent ( 9 ) for coupling the sections ( 2 . 4 ) are arranged on the cam large stroke; d) in the circular section ( 4 ) is a acting on the gas exchange valve hydraulic lash adjuster ( 6 ) e) to a floor ( 3a ) facing away ( 56 ) of the shaping ( 11 ) of the annular portion ( 2 ) is a thin-walled ring part ( 17 ), which on the one hand at its outer edge ( 22 ) with a sleeve extending in the direction of the gas exchange valve ( 18 ) connected to its outer shell ( 57 ) on an inner jacket ( 19 ) of the shirt ( 3 ), and which ring part ( 17 ) on the other hand at its inner edge ( 23 ) in an annular, on an outer shell of the guiding approach ( 32 ) adjoining collar ( 58 ) passes over; f) in the cross section of the plunger ( 1 ) limit the formations ( 11 ) of the annular portion ( 2 ) exactly two opposite, circular ring-shaped storage rooms ( 13 . 14 ) for hydraulic means; g) in the circumferential direction of the plunger ( 1 ) are offset to each other in the shirt ( 3 ) two passages ( 15 . 16 ), one of which is in the axial direction of the plunger ( 1 ) extending first channel ( 20 ) and the other with a in the axial direction of the plunger ( 1 ) extending second channel ( 26 ), the first channel ( 20 ) in a first of the two storerooms, 13 . 14 ) and the second channel ( 26 ) into a second of the two storerooms ( 13 . 14 ); h) the first storage room ( 13 ) has a perpendicular to the axial line of the plunger ( 1 ) crossing ( 21 ) into the shape ( 11 ) into the coupling means ( 9 ), the second storage space ( 14 ) into one between the management approach ( 32 ) and the collar ( 58 ) extending supply line to the clearance compensation element ( 6 ) and i) that ring part ( 17 ) is at its edge region ( 46 ) to the sleeve ( 18 ), his at the molding ( 11 ) adjacent section and its edge region ( 45 ) to the collar ( 58 ) with a radially extending weld ( 49 ) for hydraulic medium-tight separation of the storage rooms ( 13 . 14 ) from each other.
  2. Plunger with the features a) - h) according to claim 1, wherein the ring part ( 17 ) in the region of the formations ( 11 ) each have a radially extending groove ( 51 ) with at least one passage ( 52 ) and that in these grooves ( 51 ) a flowable sealing paste, a solder or a sintering powder ( 48 ) as a sealant ( 28 ), for hydraulic medium-tight separation of the storage spaces ( 13 . 14 ) from each other, via the passages ( 52 ) is brought.
  3. Plunger with the features a) - h) according to claim 1, wherein the ring part ( 17 ) at its edge region ( 45 ) to the sleeve ( 18 ) and its edge region ( 46 ) to the collar ( 58 ) in the area of the molding ( 11 ) one opening each ( 47 ) through which opening ( 47 ) a flowable sealing paste, a solder or a sintering powder ( 48 ) as a sealant ( 28 ), for hydraulic medium-tight separation of the storage spaces ( 13 . 14 ) from each other,
DE19728100A 1997-07-02 1997-07-02 Switchable plunger for a valve train of an internal combustion engine Expired - Lifetime DE19728100B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19728100A DE19728100B4 (en) 1997-07-02 1997-07-02 Switchable plunger for a valve train of an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19728100A DE19728100B4 (en) 1997-07-02 1997-07-02 Switchable plunger for a valve train of an internal combustion engine

Publications (2)

Publication Number Publication Date
DE19728100A1 DE19728100A1 (en) 1999-01-07
DE19728100B4 true DE19728100B4 (en) 2005-11-10

Family

ID=7834332

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19728100A Expired - Lifetime DE19728100B4 (en) 1997-07-02 1997-07-02 Switchable plunger for a valve train of an internal combustion engine

Country Status (1)

Country Link
DE (1) DE19728100B4 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913290A1 (en) * 1999-03-24 2000-09-28 Schaeffler Waelzlager Ohg Switchable cam tracker for engine valve drive, with at least one web forms in sectors or completely of injectable foam material
DE10123966A1 (en) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Bucket tappet for valve drive has jacket with appreciably lower height than bucket tappet as whole
DE10201805A1 (en) 2002-01-18 2003-07-31 Ina Schaeffler Kg Switchable cam follower or switchable support element of a valve train of an internal combustion engine
DE102004036108A1 (en) * 2004-07-24 2006-02-16 Ina-Schaeffler Kg Periodically actuated plunger for a valve or pump drive
DE102010008007A1 (en) 2010-02-15 2011-08-18 Schaeffler Technologies GmbH & Co. KG, 91074 Switchable cam follower for actuating gas exchange valve of internal combustion engine, has hollow-cylindrical outer element for actuating valve with large stroke and cylindrical inner element for actuating valve with smaller stroke

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409235A1 (en) * 1984-03-14 1985-09-19 Motomak External guide part for a valve tappet for internal combustion engines
DE3810436A1 (en) * 1988-03-26 1989-10-12 Schaeffler Waelzlager Kg Automatically hydraulically adjusting valve
DE4314619A1 (en) * 1993-05-04 1994-11-10 Schaeffler Waelzlager Kg Pestle
DE4333927A1 (en) * 1993-10-05 1995-04-06 Schaeffler Waelzlager Kg Switch plunger
DE4436952A1 (en) * 1994-10-15 1996-04-18 Schaeffler Waelzlager Kg Switchable tappet of a valve train of an internal combustion engine
DE4440469A1 (en) * 1994-11-12 1996-05-30 Peter Prof Dr Tenberge Engageable tappet for valve drive in IC engine
DE4443101A1 (en) * 1994-12-03 1996-06-05 Schaeffler Waelzlager Kg Valve tappet for IC engine valve drive
DE19515284A1 (en) * 1995-04-26 1996-10-31 Schaeffler Waelzlager Kg Cam follower of a valve train of an internal combustion engine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409235A1 (en) * 1984-03-14 1985-09-19 Motomak External guide part for a valve tappet for internal combustion engines
DE3810436A1 (en) * 1988-03-26 1989-10-12 Schaeffler Waelzlager Kg Automatically hydraulically adjusting valve
DE4314619A1 (en) * 1993-05-04 1994-11-10 Schaeffler Waelzlager Kg Pestle
DE4333927A1 (en) * 1993-10-05 1995-04-06 Schaeffler Waelzlager Kg Switch plunger
DE4436952A1 (en) * 1994-10-15 1996-04-18 Schaeffler Waelzlager Kg Switchable tappet of a valve train of an internal combustion engine
DE4440469A1 (en) * 1994-11-12 1996-05-30 Peter Prof Dr Tenberge Engageable tappet for valve drive in IC engine
DE4443101A1 (en) * 1994-12-03 1996-06-05 Schaeffler Waelzlager Kg Valve tappet for IC engine valve drive
DE19515284A1 (en) * 1995-04-26 1996-10-31 Schaeffler Waelzlager Kg Cam follower of a valve train of an internal combustion engine

Also Published As

Publication number Publication date
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