EP3186492B1 - Poussoir à coupelle et procédé pour sa fabrication - Google Patents

Poussoir à coupelle et procédé pour sa fabrication Download PDF

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Publication number
EP3186492B1
EP3186492B1 EP15744476.1A EP15744476A EP3186492B1 EP 3186492 B1 EP3186492 B1 EP 3186492B1 EP 15744476 A EP15744476 A EP 15744476A EP 3186492 B1 EP3186492 B1 EP 3186492B1
Authority
EP
European Patent Office
Prior art keywords
bucket
tappet
cam
contact face
combustion engine
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.)
Not-in-force
Application number
EP15744476.1A
Other languages
German (de)
English (en)
Other versions
EP3186492A1 (fr
Inventor
Günter EISENHARDT
Manfred STRÄTZ
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
Publication of EP3186492A1 publication Critical patent/EP3186492A1/fr
Application granted granted Critical
Publication of EP3186492B1 publication Critical patent/EP3186492B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F01L1/16—Silencing impact; Reducing wear
    • 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
    • F01L1/146—Push-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the invention relates to a tappet for an internal combustion engine, comprising a tappet housing with a hollow cylindrical cup shirt and the cup shirt unilaterally closing cup bottom on which the cup shirt is formed by chipless cold forming a steel blank, the outside of the cup bottom as a contact surface for a tappet hubbeaufierden the Internal combustion engine is used, and in which the outside of the cup top as a contact surface for a cup tappet in the stroke direction overlapping guide bore of the internal combustion engine.
  • Such tappets are used in the gas exchange valve drive of an internal combustion engine to transmit the cam lobe of a cam on a camshaft in an opening movement of the associated gas exchange valve.
  • the bucket tappet as a tappet for the cam of a fuel injection pump to transfer the collection of the pump cam to the piston of the injection pump.
  • it is a mechanically heavily loaded component, which on the one hand has to withstand the Hertzian stresses occurring in the cam contact with sufficient wear and which, on the other hand, has to be supported sufficiently wear and noise in a guide bore.
  • tappet housings made of steel, which are subsequently heat-treated to increase the hardness of all contact surfaces.
  • the machined end contour of the tappet housing is typically carried out in a grinding process in which the outside of the cup, ie the guide contact surface of the tappet, to the required for the longitudinal guidance of the tappet and the cup outside of the cup base, that is, the cam contact surface on the Cam contact required surface geometry with respective reduction of the surface roughness finish.
  • the present invention has the object, a bucket tappet of the type mentioned and a method for its production in each case with regard to reduced manufacturing costs.
  • the invention therefore initially relates to a bucket tappet for an internal combustion engine, comprising a tappet housing with a hollow cylindrical cup shirt and a cup skirt on one side closing cup base on which the cup shirt is formed by chipless cold forming a steel blank, the outside of the cup bottom hubbeaufurgiden as a contact surface for a tappet Cam of the internal combustion engine is used, and in which the outside of the cup top as a contact surface for a cup tappet in the stroke direction overlying guide bore of the internal combustion engine.
  • the unprocessed and uncoated cam contact surface of the cup base is machined by means of a brushing tool in this tappet.
  • the cam contact surface of the cup bottom is not finely worked by a polishing and / or lapping process, but the entire mechanical processing of the cam contact surface of the cup bottom is effected exclusively by brushing, so that the cam contact surface has an isotropic structure, and so mechanically machined tappets whose cup shirt is cut to size, can be used already in this form.
  • the bucket tappet may be heat treated after the cold forming for the purpose of increasing hardness, wherein the brushing of the cam contact surface of the cup bottom may take place before or after the heat treatment.
  • cam contact surface of the cup bottom has a coating, which is preferably formed as a DLC coating.
  • the brushing takes place in such a way that an isotropic surface structure is formed.
  • the method may additionally comprise the following step: aa) heat treatment of the bucket tappet for hardness increase before brushing the cam contact surface.
  • the method can have the additional step: d) After brushing, apply a coating to the cam contact surface, such as a DLC coating.
  • the cam contact surface of the cup bottom has a targeted and significant improvement in the surface roughness, without changing the surface topography generated when rolling the sheets for the steel plate strongly.
  • This special topography has a positive effect on the reduction of the friction torque between the cam and the plunger. Since that according to the DE 10 2011 076 410 A1 provided polishing and / or lapping the cam contact surface before applying the DLC coating is omitted and replaced by the brushing of the unprocessed and uncoated cam contact surface of the cup bottom, while after application of the DLC coating no further brushing is performed, the processing time of the tappet is shortened and simplifies the manufacturing process, resulting in reduced manufacturing costs.
  • the invention is particularly advantageous in relation to the production of a tappet for an internal combustion engine, but also rocker arms or rocker arms in piston machines, but also gear or roller bearing components, in particular bearing rings and rolling elements, such as balls, needles, cylindrical rollers or tapered rollers, according to the invention form and produce.
  • a steel is preferably used as the base material of the machine element to be coated.
  • Fig. 1 shows a designed as a bucket tappet gas exchange valve drive an internal combustion engine with mechanical valve clearance compensation.
  • the mechanical bucket tappet 1 consists exclusively of a cup-shaped tappet housing 2, which is made in one piece by chipless cold forming of a steel blank and here by deep drawing a sheet metal blank.
  • the plunger housing 2 is composed of a hollow cylindrical cup shirt 3 and an axially end-side cup base 4, on which the cup shirt 3 is formed and which closes the cup 3 on one side.
  • the axial outer side of the cup base 4 serves as a contact surface 5 for a cam 6, the elevation of which is transmitted from the tappet 1 in an opening movement of the spring-loaded in the closing direction gas exchange valve 7.
  • the radial outer side of the cup 3 serves as a contact surface 8 for a cup-tappet 1 in the stroke direction supporting hollow cylindrical guide bore 9 of the internal combustion engine.
  • the axial inside of the cup base 4 is provided with an elevation 10 extending in the axial direction of the gas exchange valve 7, which contacts the shaft of the gas exchange valve 7 at the end.
  • the valve clearance adjustment is carried out by sorting a tappet 1 with an appropriate for the setpoint valve clearance axial height 11 of the survey 10, wherein the tappet 1 is selected from a group sorting with different elevations 10 and then mounted.
  • a finely machined, in particular ground end surface 12 of the elevation 10 can be provided.
  • the deep-drawn and subsequently heat-hardened ram housing 2 is at the radial outer side only on the outside of the cup 3, that is machined in the region of the contact surface 8, machined and ground here. This ensures that the required dimensional and shape tolerances of the cup shirt 3 in the guide bore 9 are in their desired range.
  • the axial outer side of the cup base 4, that is, the cam contact surface 5, however, is only brushed and has an isotropic surface structure, which is only slightly different from that in the deep-drawing process and differs in the heat treatment of the plunger housing 2 generated surface structure and surface geometry.
  • Fig. 2 shows the processing of the tappet 1 by brushing.
  • the roller 15 has particle-filled filaments 14.
  • the rotating roller brush 13 is moved in the direction of the double arrow B back and forth.
  • the tappet 1 is rotated in accordance with the arrow D in rotation about its longitudinal axis.
  • the tappet 1 can also be moved back and forth in the direction of the double arrow E in order to obtain the desired isotropic structure of the cam contact surface 5.
  • a DLC coating 5a is applied to the cam contact surface 5 in this embodiment.
  • Such coatings are in the DE 10 2011 076 410 A1 disclosed, so that their content is hereby made the subject of the present disclosure.
  • roller brush 15 instead of a roller brush 15, it is also possible to use a well-known cup brush whose axis of rotation is perpendicular to the cup tappet 1 and whose end face facing the cam contact surface has the particle-filled filaments 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (10)

  1. Poussoir à coupelle (1) pour un moteur à combustion interne, présentant un boîtier de poussoir (2) avec une jupe de coupelle (3) cylindrique creuse ainsi qu'un fond de coupelle (4) fermant d'un côté la jupe de coupelle (3), sur lequel est façonnée la jupe de coupelle (3) par formage à froid, sans enlèvement de copeaux, d'une ébauche en acier, le côté extérieur du fond de coupelle (4) servant de surface de contact (5) pour une came (6) du moteur à combustion interne provoquant une course du poussoir à coupelle (1), et le côté extérieur de la jupe de coupelle (3) servant de surface de contact (8) pour un alésage de guidage (9) du moteur à combustion interne supportant le poussoir à coupelle (1) dans la direction de sa course, caractérisé en ce que la surface de contact de came (5) du fond de coupelle (4) non usinée et non revêtue est usinée par enlèvement de copeaux au moyen d'un outil à brosse (13) .
  2. Poussoir à coupelle selon la revendication 1, caractérisé en ce que la surface de contact de came (5) est usinée de manière à présenter une structure isotrope.
  3. Poussoir à coupelle selon la revendication 1 ou 2, caractérisé en ce que le poussoir à coupelle (1) est soumis à un traitement thermique après le façonnage à froid afin d'augmenter sa dureté.
  4. Poussoir à coupelle selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la surface de contact de came brossée (5) du fond de coupelle (4) présente un revêtement (5a).
  5. Poussoir à coupelle selon la revendication 4, caractérisé en ce que le revêtement (5a) est réalisé sous forme de revêtement DLC.
  6. Procédé de fabrication d'un poussoir à coupelle (1) pour un moteur à combustion interne, qui présente un poussoir à coupelle (1), un boîtier de poussoir (2) avec une jupe de coupelle (3) cylindrique creuse et un fond de coupelle (4) fermant d'un côté la jupe de coupelle (3), sur lequel la jupe de coupelle (3) est façonnée par formage à froid, sans enlèvement de copeaux, d'une ébauche en acier, le côté extérieur du fond de coupelle (4) servant de surface de contact (5) pour une came (6) du moteur à combustion interne provoquant une course du poussoir à coupelle (1), et le côté extérieur de la jupe de coupelle (3) servant de surface de contact (8) pour un alésage de guidage (9) du moteur à combustion interne supportant le poussoir à coupelle (1) dans la direction de sa course, caractérisé par les étapes suivantes :
    a) emboutissage profond du boîtier de poussoir (2) à partir d'un flan en tôle ;
    b) brossage de la surface de contact de came non usinée et non revêtue (5).
  7. Procédé selon la revendication 6, caractérisé en ce que le brossage s'effectue de manière à obtenir une structure isotrope.
  8. Procédé selon la revendication 6 ou 7, comprenant l'étape supplémentaire suivante :
    aa) traitement thermique du poussoir à coupelle (1) afin d'augmenter sa dureté avant le brossage de la surface de contact de came.
  9. Procédé selon la revendication 7 ou 8, comprenant l'étape supplémentaire suivante :
    d) après le brossage, application d'un revêtement (5a) sur la surface de contact de came (5).
  10. Procédé selon la revendication 9, caractérisé par l'application d'un revêtement DLC (5a) sur la surface de contact de came (5).
EP15744476.1A 2014-08-26 2015-06-16 Poussoir à coupelle et procédé pour sa fabrication Not-in-force EP3186492B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014216961.5A DE102014216961A1 (de) 2014-08-26 2014-08-26 Tassenstößel und Verfahren zu dessen Herstellung
PCT/DE2015/200370 WO2016029910A1 (fr) 2014-08-26 2015-06-16 Poussoir à coupelle et procédé pour sa fabrication

Publications (2)

Publication Number Publication Date
EP3186492A1 EP3186492A1 (fr) 2017-07-05
EP3186492B1 true EP3186492B1 (fr) 2018-08-15

Family

ID=53761912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15744476.1A Not-in-force EP3186492B1 (fr) 2014-08-26 2015-06-16 Poussoir à coupelle et procédé pour sa fabrication

Country Status (7)

Country Link
US (1) US10066516B2 (fr)
EP (1) EP3186492B1 (fr)
JP (1) JP2017526856A (fr)
KR (1) KR20170043645A (fr)
CN (1) CN106661968B (fr)
DE (1) DE102014216961A1 (fr)
WO (1) WO2016029910A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020100307A1 (de) * 2020-01-09 2021-07-15 Schaeffler Technologies AG & Co. KG Brücke für einen Ventiltrieb einer Heavy-Duty-Brennkraftmaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19815790B4 (de) * 1997-05-26 2010-05-12 Schaeffler Kg Mechanischer Ventilstößel
DE10114073A1 (de) * 2001-03-22 2002-09-26 Ina Schaeffler Kg Stößel
DE10123966A1 (de) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Tassenstößel
DE10360467B4 (de) * 2003-12-22 2011-11-10 Trw Deutschland Gmbh Mechanischer Ventilstößel
JP5238488B2 (ja) * 2006-02-20 2013-07-17 株式会社ジーベックテクノロジー ブラシ状砥石
DE102006036839A1 (de) * 2006-08-07 2008-02-14 Rolls-Royce Deutschland Ltd & Co Kg Verfahren zum Bürstentgraten von Kanten von Triebwerksschaufeln
DE102010032254A1 (de) * 2010-07-26 2012-01-26 Schaeffler Technologies Gmbh & Co. Kg Tassenstößel und Verfahren zu dessen Herstellung
DE102011076410A1 (de) * 2011-05-24 2012-11-29 Schaeffler Technologies AG & Co. KG Maschinenelement
DE102011120591A1 (de) * 2011-12-08 2013-06-13 Federal-Mogul Burscheid Gmbh Verfahren zur Bearbeitung von Kolbenringen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
KR20170043645A (ko) 2017-04-21
JP2017526856A (ja) 2017-09-14
WO2016029910A1 (fr) 2016-03-03
CN106661968B (zh) 2019-06-21
CN106661968A (zh) 2017-05-10
US10066516B2 (en) 2018-09-04
EP3186492A1 (fr) 2017-07-05
US20170081985A1 (en) 2017-03-23
DE102014216961A1 (de) 2016-03-03

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