WO2006056328A1 - Poussoir a coupelle - Google Patents

Poussoir a coupelle Download PDF

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Publication number
WO2006056328A1
WO2006056328A1 PCT/EP2005/012141 EP2005012141W WO2006056328A1 WO 2006056328 A1 WO2006056328 A1 WO 2006056328A1 EP 2005012141 W EP2005012141 W EP 2005012141W WO 2006056328 A1 WO2006056328 A1 WO 2006056328A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
locking plate
dome
securing element
securing
Prior art date
Application number
PCT/EP2005/012141
Other languages
German (de)
English (en)
Inventor
Josef GRÖSCHEL
Original Assignee
Schaeffler 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 Kg filed Critical Schaeffler Kg
Publication of WO2006056328A1 publication Critical patent/WO2006056328A1/fr

Links

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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/205—Adjusting or compensating clearance by means of shims or the like
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts

Definitions

  • the invention relates to a bucket tappet of mechanical design according to the preamble of claim 1.
  • a mechanical bucket tappet with a hollow-cylindrical housing is known.
  • the housing has a shirt whose outer jacket is guided axially movably in a receiving bore of a cylinder head of an internal combustion engine.
  • the shirt is closed by a disc-shaped bottom of the housing.
  • One end face of the bottom is acted upon by a control cam, while on the other end face abuts a support element designed as an adjusting element. On the adjustment in turn one end of a valve stem is supported.
  • a hydraulic bucket tappet is known in which the maximum stroke of a lift valve is limited by an annular stop in a housing of the bucket tappet, so that a displacement area of an inner tappet in one direction by the aforementioned stop and in a other direction is limited by the bottom of the tappet.
  • a support member is arranged with a predetermined axial extent.
  • the support element is in the form of a dome with a U-shaped longitudinal section, wherein the base leg of the U-shaped cross-section rests against an end face of the valve stem, while the end regions of the side legs of the U-shaped cross-section bear against the bottom of the cup ram.
  • Cup tappets with hydraulic lash adjusters and switchable tappets are known for example from the publications DE 199 02 445 A1, DE 101 23 966 A1, DE 199 13 290 A1, DE 101 35 175 A1 and DE 101 47 561 A1.
  • the invention has for its object to provide a bucket tappets, which carries a simple assembly, low weight, ease of manufacture and / or reliable operation in particular account. Summary of the invention
  • the present invention is based on the finding that a cup tappet according to DE 94 14085 U1 can only be mounted or dismounted with a special tool represented in the document.
  • Another Nach ⁇ part of this tappet is that in the power flow between Ab NAle- ment and housing a frictional connection is interposed. This causes, for example, problems with an exact setting and positioning of the support element with regard to the housing and thus with regard to an exact predefinition of the position of the valve stem, since the frictionally engaged connection permits a plurality of stable positions.
  • Another disadvantage of this known tappet is that the frictional connection, even with vibrations of the internal combustion engine, due to the rapid opening and closing movement of the associated valve high dynamic forces aus ⁇ is set, which must be transmitted via the frictional force. Accordingly, the axial position between the holding part and the adjusting element can be adjusted, which impairs the operation of the internal combustion engine and in the worst case can damage the internal combustion engine.
  • the bucket tappet according to the invention is of such a mechanical design which, in connection with this invention, comprises any type in which a flow of force between the valve stem and the control surfaces does not occur with the interposition of hydraulic elements.
  • This includes bucket tappets in which the distance between the contact surface between the valve stem and the control cam is constant or in which the aforementioned distance a priori or during operation of the internal combustion engine in a mechanical manner, continuously or in stages or switchable adjustable.
  • the bucket tappet according to the invention has a supporting element which is supported in a lifting direction directly opposite the ground. This is a good support, possibly given with a large contact surface. For this purpose, it may be sufficient if an end face of the Ab gale- element rests against the ground. Furthermore, it is advantageous that no further components are interposed between the base and support, whose deformations could influence the control behavior of the tappet associated with the valve.
  • the support element can also bridge larger distances between the base and the valve stem.
  • the support element is positively supported gegen ⁇ over the housing.
  • Such a form-fitting support follows directly hereby, whereby a particularly good connection can be achieved, or indirectly with the interposition of additional components.
  • the support element is thus according to the invention positively received between a first support on the ground in a stroke direction and an opposite Ab ⁇ support on a contact surface of the housing.
  • the support element can be clamped between the abovementioned end positions or boundary conditions, or a fit (clearance fit, transition fit, press fit) can be provided between the abovementioned opposing supports.
  • a support can be made transversely to the stroke direction.
  • a der ⁇ like support in the transverse direction can be accomplished by the support of the Ab leveragele ⁇ element in the region of the bottom and / or by the support of the Ab leveragele- ment in the other stroke direction relative to the housing were ⁇ the.
  • the support on the ground and / or on the housing can be multi-functional.
  • a contact surface of the housing and a contact surface of the support member is provided for the positive support of Abstütz ⁇ against the housing, the surface normal has at least one component in the stroke direction, so that a suitable normal force is generated for positive support. If the support element is located directly on the bottom as well as on the valve stem, a particularly rigid connection is provided.
  • abutment surfaces can be provided in particular by a projection of the housing and / or the support element.
  • a contact surface can be provided, for example, by a securing element such as a securing ring or the like.
  • the positive connection between the support element and the housing is brought about by the fact that the support element is clipped into the housing.
  • Dem ⁇ according to the support element and / or the housing for example, radially elastic means are provided which enter into radial projections or grooves for producing the positive connection.
  • einklipste compounds are characterized in a particularly simple assembly by a high reliability. Under certain circumstances, a disassembly for such a clipped-in solution can be made particularly simple if the radial spreading of the radial elastic means is reversed again for such a disassembly.
  • the Ab ⁇ support element is formed with two separate components:
  • the support element has a dome. This dome abuts the bottom of the support member in one end portion while the other end portion engages the valve stem.
  • the dome has thus primarily the function of a power transmission between the bottom and valve stem.
  • the support element has a securing element.
  • This securing element serves for a positive connection of the dome with the housing in the other stroke direction.
  • the Sichroiss ⁇ element on the one hand, for example, radially inwardly, positively connected to the dome, and on the other hand, for example, radially outward, form-fitting manner connected to the housing.
  • the fuse element can be clipped into the housing.
  • the securing element is a locking plate.
  • Such locking plates can be produced in a particularly simple manner at low production costs and with a low weight.
  • the mechanical properties of a locking plate can be selected and influenced in a special way.
  • a metal sheet with a predetermined stiffness or a spring steel sheet can be used as a semi-finished product for such a safety sheet.
  • the locking plate can be further stiffened, for example by residual stresses of the material and / o ⁇ by introducing suitable stiffening elements or ribs.
  • the invention proposes that the securing element has a bore.
  • the support element is inserted in the second stroke direction.
  • the support element is positively supported in an end position in the second stroke direction relative to the securing element.
  • a suitable abutment surface of the support element may rest against the surrounding area of the bore.
  • the bore can additionally be used to also ensure a guide between the securing element and the supporting element transversely to the lifting direction. Accordingly, the securing element is equipped in the region of the bore with multiple functions.
  • this projection has been produced in a forming process.
  • This forming process may in particular include a loading of the shirt in the stroke direction, as a result of which the shirt evades in the radial direction or an enlargement of the wall thickness of the shirt results inwards.
  • this forming process can take place after the securing plate has been brought to its place of use.
  • the forming process can take place before the securing sheet is introduced, so that the securing sheet is brought into operative connection with the projection in a subsequent assembly step, for example clipping behind this projection.
  • the securing element has an outer contour which supports approximately two parallel side regions and two curve regions connecting the parallel side regions in their end regions, wherein the securing element is supported relative to the housing in the second stroke direction only in the regions of the curved regions is.
  • the securing element has an approximately circular outer contour, in particular for the case that the hedging element is intended to be connected to the housing of the tappet radially outwardly over a large part of the peripheral surface.
  • the outer contour has radial cuts, so that individual radially outwardly oriented tongues are formed.
  • FIG. 1 shows a housing of a tappet according to the invention
  • Figure 2 shows a locking plate of a tappet according to the invention
  • FIG. 3 shows a dome of a cup tappet according to the invention
  • FIG. 5 shows a mounted cup tappet according to the invention in a first longitudinal section
  • FIG. 6 shows a mounted bucket tappet according to the invention in a second longitudinal section
  • FIG. 7 shows an assembly for an alternative embodiment of a tappet according to the invention
  • Figure 8 shows a locking plate of the tappet shown in Fig. 7 in a plan view.
  • the invention relates to a tappet 1, which in a known manner, but not shown in the figures manner between a control cam of a valve train and a valve stem of a valve of an internal combustion engine zwi ⁇ is switched.
  • the bucket tappet according to the invention has a housing 2, a locking plate 3 and a dome 4.
  • the housing 2 is shown in Figure 1 in a spatial, partially sectional view in a coordinate system X, Y, Z, wherein the axis Z-Z of the stroke direction of the valve corresponds.
  • a first stroke direction 40 is oriented in the direction of the bottom or the control cam and the second stroke direction 41 in the opposite direction, which corresponds to an opening of the valve.
  • the housing 2 is shown partially broken.
  • the housing 2 has an approximately U-shaped longitudinal section with two side legs 5, 6 and a base leg 7.
  • the side legs 5, 6 are part of the hollow cylindrical shirt 8.
  • In the upper end of the shirt goes over 8 in the formed with the base leg 7, in
  • the bottom 9 is not flat or formed in a simple manner convexly curved ge ⁇ but rather with a contact region 10 protruding in the direction of the control eye.
  • FIG. 5 shows a section through the housing 2 in the plane XZ with the contact region 10 oriented approximately transversely to the axis ZZ in this section, which is rectilinear in this section and merges into the shirt 8 via radially outer LJ transition regions 11, 12.
  • the transition areas 11, 12 are approximately quarter-circle-shaped with suitable roundings in the connection area with the contact area 10 and the shirt 8.
  • the contact region 10 is slightly convex and merges into the shirt 8 without a transition region.
  • the contact region 10 has an outer contour with two approximately parallel side regions 13, which are oriented parallel to the axis YY and are connected to one another in their end region with the upper end of the shirt 8, ie with approximately circular segment-shaped curve regions 14.
  • the housing 2 has to form the voratden contact portion 10 at approximately constant wall thickness of the housing 2 has a recess 15 which ends on the contact region 10 opposite side of the bottom 9, here approximately has the cross section of the contact portion 10 and whose extension in the direction of the axis XX as a result of the transition regions 11, 12 increases with increasing distance from the bottom 9.
  • the shirt 8 has spaced from the contact region 10 and the transition region of the contact region 10 to the shirt 8 a thickening of the wall thickness, which may be formed as a radially inwardly oriented projection 16, see. FIG. 6.
  • the projection 16 is circumferential in the circumferential direction or provided only in partial peripheral areas, preferably at the mouth into the transitional regions 11, 12.
  • the projection 16 has a central region of approximately constant height and runs in the end region facing the control cam as well in the opposite end region with transition areas 42, 43 in a curved shape or with the formation of a slope into the normal wall thickness of the shirt 8.
  • the transition region 42 arranged on the side facing the bottom 9 forms a contact surface 44. In this way an undercut 17 is formed between the projection 15 and the bottom 9.
  • the outer contour of the securing plate 3 corresponds approximately to an outer contour of the contact area 10 or the recess 15.
  • the locking plate 3 is simplified in a half-section with a sectional view along the plane YZ designed to be U-shaped with a radially inner side leg 18 and a parallel radially outer side leg 19 which are interconnected by the base leg 20.
  • ⁇ leg 18 is formed by a tubular receiving body 21 having a bore 39 forming cylindrical inner surface.
  • the central bore 39 is arranged coaxially with the axis ZZ in the installed state.
  • the thigh 19 is part of a likewise approximately hollow cylindrical projection 22 of the locking plate 3.
  • the projection 22 passes through a step 23 in the base leg 20, in a first annular portion 24, whose inclination relative to the axis ZZ of the inclination of Mixberei ⁇ 10 is adapted in the corresponding area, as well as a second circular annular portion 25 which adjoins this inwardly radially and which is formed corresponding to the lateral surface of a truncated cone with an opening angle in the direction of the control cam, the second portion being radially inward in FIG the receiving body 21 passes.
  • the dome 4 has a U-shaped longitudinal section with a base leg 26 and two approximately parallel side legs 27, 28.
  • the base leg 26 is part of a flat, approximately circular contact surface 29, on which comes in operation a valve lifter for conditioning.
  • the side legs 27, 28 are part of a hollow cylinder 30 which is formed in a radial guide region 31 adjacent to the contact surface 29 with a smaller outside diameter than a support region 32 which is arranged on the side of the radial guide region 31 facing away from the contact surface 29.
  • the radial guide region 31 is received in the bore 39.
  • the radial guide region 31 merges into the support region 32 via a transition region 33.
  • the transition region 33 is formed as a slope, paragraph or any curve-shaped contour. According to the exemplary embodiment illustrated in FIG. 3, the radial guide region 31 merges into the contact surface 29 via a circumferential chamfer 34.
  • a second assembly step 36 then the locking plate 3 is inserted with ein ⁇ set dome 4 from below into the housing 2, wherein the Ausrich ⁇ direction of the locking plate 3 with the alignment of the recess 15 and the contact portion 10 corresponds. Accordingly, the locking plate 3 can enter with the dome 4 in the recess 15.
  • the end face 37 of the supporting region 32 facing away from the contact surface 29 comes to bear against the bottom 9.
  • the projection 22 of the securing sheet 3 comes into operative connection with the projection 16 of the housing 2. With increasing height of the projection 16 in the transition region 43, the projection 22 is increasingly pressed radially inward, which is accompanied by an elastic deformation of the locking plate 3.
  • the securing plate 3 can again expand radially outward, as a result of which a positive reception of the lugs 22 of the securing plate 3 in the housing 2 is provided. If the contact between the dome 4 and the base 9 occurs before the undercut 17 has been reached, a prestressing of the securing plate 3 is provided with reaching the undercut 17, which predetermines a pressure force of the dome 4 on the base 9 - otherwise it is under Circumstances a game between bottom 9 and Dom 4 and the lugs 22 and 16 projection possible. A positive securing of the securing plate 3 against the dome 4 takes place via the fact that the securing plate 3 rests against the contact surface 44 in the region of the projection 22.
  • the securing effect between the locking plate 3 and the housing 2 can be influenced in particular by the following parameters:
  • the height of the projections 16 the design of the transition regions 42, 43 between the projection 16 and undercut 17, in particular the contour or its inclination; the design of the projections 22 in the contact area with the contact surface
  • FIG. 7 shows an alternative embodiment of a tappet 1 ', in which the bottom 9 1 is simplified, since the contact area 10 does not emerge from this, no recess 15 is provided and thus the bottom 9 1 approximately circular disc-shaped, possibly with a slightly convex design is as.bil ⁇ det.
  • the securing plate 3 1 is formed with a deviating, approximately circular outer contour.
  • the securing plate 3 1 has radial cuts 37 which are arranged at arbitrary circumferential angles 8, eight notches 37 are uniformly distributed over the circumference, the notches may be provided only in the area of the lugs 22 or further radially inward through the first portion 24 'or into the second part Tongues 38 are formed between the cuts 37.
  • an anti-rotation device can be provided between locking plate 3 and housing 2 and / or securing plate 3 and dome 4.
  • This rotation lock can be formed, for example, in the form of a radially inwardly or outwardly directed projection of one of the mentioned components, which rests in the circumferential direction on a lateral boundary of a recess of the other component.
  • a radially inwardly directed projection of the shirt 8 ' is to be mentioned here, which enters into an incision 37 of the securing plate 3 1 .
  • the dome preferably has a height in the range of 0.5, 1.0, 1.5, 2.0 or more than two millimeters to 4 millimeters.
  • the dome is in particular made of a material C45M (thermosetting material) produced by means of a Um ⁇ molding process, heat treated and ground at least the height.
  • the security plate is made from C45N (spring steel properties) by forming technology and mounted in soft condition.
  • the dome is measured in height and sorted into groups.
  • the group-sorted dome is placed on the securing plate and clipped together with it into the housing.
  • the cup tappet mounted in the desired group height is labeled and packaged.
  • this assembly process can also be carried out on site by a customer.
  • the group sorting of different domes makes individual tuning to a motor possible. This results in a reduction of a disposition expenditure and the provision area for group-sorted Tas ⁇ senst Congressel.
  • the dome can be made as a solid body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un poussoir à coupelle de conception mécanique, comprenant un boîtier (2) doté d'une chemise (8) et d'un fond (9). Un dôme (4) appuie directement contre le fond (9) dans un sens de la course du poussoir à coupelle (1). Selon l'invention, le dôme (4) appuie par liaison de forme contre le boîtier (2) dans l'autre sens de la course, d'où l'utilisation d'une tôle de sécurité (3) dans laquelle le dôme (4) peut être disposé, ce dernier s'encliquetant radialement à l'extérieur, derrière un épaulement (16) du boîtier (2).
PCT/EP2005/012141 2004-11-23 2005-11-12 Poussoir a coupelle WO2006056328A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004056458.2 2004-11-23
DE200410056458 DE102004056458A1 (de) 2004-11-23 2004-11-23 Tassenstößel

Publications (1)

Publication Number Publication Date
WO2006056328A1 true WO2006056328A1 (fr) 2006-06-01

Family

ID=35825407

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/012141 WO2006056328A1 (fr) 2004-11-23 2005-11-12 Poussoir a coupelle

Country Status (2)

Country Link
DE (1) DE102004056458A1 (fr)
WO (1) WO2006056328A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012013376A1 (fr) * 2010-07-26 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Poussoir à coupelle et procédé pour sa fabrication

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009013130A1 (de) * 2009-03-13 2010-09-16 Schaeffler Technologies Gmbh & Co. Kg Stössel
DE102020104313B3 (de) * 2020-02-19 2021-01-28 Schaeffler Technologies AG & Co. KG Stößel zur Beaufschlagung eines Pumpenkolbens einer Kraftstoffhochdruckpumpe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4118776A1 (de) * 1991-06-07 1992-12-10 Schaeffler Waelzlager Kg Mechanischer ventilstoessel fuer eine brennkraftmaschine
DE4340035A1 (de) * 1992-12-10 1994-06-16 Schaeffler Waelzlager Kg Mechanischer Ventilstößel
DE4406409A1 (de) * 1994-02-28 1995-08-31 Schaeffler Waelzlager Kg Mechanischer Ventilstößel
DE4444481A1 (de) * 1994-12-14 1996-06-20 Schaeffler Waelzlager Kg Stößel mit einem hydraulischen Ventilspielausgleichselement
DE10106983A1 (de) * 2001-02-15 2002-08-29 Ina Schaeffler Kg Stößel
DE10360467A1 (de) * 2003-12-22 2005-07-21 Trw Deutschland Gmbh Mechanischer Ventilstößel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123966A1 (de) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Tassenstößel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4118776A1 (de) * 1991-06-07 1992-12-10 Schaeffler Waelzlager Kg Mechanischer ventilstoessel fuer eine brennkraftmaschine
DE4340035A1 (de) * 1992-12-10 1994-06-16 Schaeffler Waelzlager Kg Mechanischer Ventilstößel
DE4406409A1 (de) * 1994-02-28 1995-08-31 Schaeffler Waelzlager Kg Mechanischer Ventilstößel
DE4444481A1 (de) * 1994-12-14 1996-06-20 Schaeffler Waelzlager Kg Stößel mit einem hydraulischen Ventilspielausgleichselement
DE10106983A1 (de) * 2001-02-15 2002-08-29 Ina Schaeffler Kg Stößel
DE10360467A1 (de) * 2003-12-22 2005-07-21 Trw Deutschland Gmbh Mechanischer Ventilstößel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012013376A1 (fr) * 2010-07-26 2012-02-02 Schaeffler Technologies Gmbh & Co. Kg Poussoir à coupelle et procédé pour sa fabrication

Also Published As

Publication number Publication date
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