EP3628831A1 - Poussoir à coupelle à blocage de rotation et son procédé de fabrication - Google Patents

Poussoir à coupelle à blocage de rotation et son procédé de fabrication Download PDF

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Publication number
EP3628831A1
EP3628831A1 EP19185122.9A EP19185122A EP3628831A1 EP 3628831 A1 EP3628831 A1 EP 3628831A1 EP 19185122 A EP19185122 A EP 19185122A EP 3628831 A1 EP3628831 A1 EP 3628831A1
Authority
EP
European Patent Office
Prior art keywords
wall
tappet
screw
bead
cup
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.)
Granted
Application number
EP19185122.9A
Other languages
German (de)
English (en)
Other versions
EP3628831B1 (fr
Inventor
Thorsten MATTHIAS
Florian Ringeling
Antonius Wolking
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.)
Federal Mogul Valvetrain GmbH
Original Assignee
Federal Mogul Valvetrain 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 Federal Mogul Valvetrain GmbH filed Critical Federal Mogul Valvetrain GmbH
Priority to PL19185122T priority Critical patent/PL3628831T3/pl
Publication of EP3628831A1 publication Critical patent/EP3628831A1/fr
Application granted granted Critical
Publication of EP3628831B1 publication Critical patent/EP3628831B1/fr
Active 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/063—Friction heat forging
    • B21J5/066—Flow drilling
    • 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
    • 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
    • F01L2307/00—Preventing the rotation of tappets

Definitions

  • the present invention relates to a tappet with rotation lock, in particular a method for producing a cup tappet with rotation lock.
  • Cup tappets come in the valve train, e.g. in internal combustion engines with an overhead camshaft, used to transmit the power from the cams to the valves.
  • the camshaft and valve e.g. Inlet and outlet valve
  • the cam stroke is transmitted to the valve directly from the bottom of the tappet.
  • This direct drive is characterized by very high rigidity and at the same time small moving masses and is therefore particularly well suited for engines with high speeds. Frictional losses occur at the contact surface between the cam and the cup base, the so-called sliding tap. These losses can, however, be kept low by means of a suitable pairing of materials or friction-reducing coatings.
  • the cam can be ground obliquely and laterally offset from the bucket tappet, so that the bucket tappet is rotated by a certain angle around the valve axis, which runs in the actuation direction, each time it is actuated.
  • the object of the present invention is therefore to provide a rotation lock for a tappet, which is simple to manufacture and allows short cycle times in the manufacture. Another task is to provide a corresponding tappet with a rotation lock.
  • the method for producing the cup tappet with rotation lock comprises providing a cup-shaped cup tappet blank with a base and a cylindrical wall and flow drilling at least one hole in the wall, so that an outer bead in the form of a web running around the at least one hole on an outside of the Wall is formed.
  • the method can further comprise removing an inner bead formed during flow drilling on an inner side of the wall.
  • flow drilling can be carried out in such a way that an inner bead is formed on the inside of the wall in the form of a web running around the at least one bore; and the method can furthermore introduce a thread into a through opening, which is formed by the at least one bore, the associated outer bead and the associated inner bead.
  • the method can include screwing a screw into the thread so that a part of the screw protrudes outwards beyond the outer bead.
  • the screwing can take place from the outside, so that a screw head of the screw is arranged on the outside of the wall.
  • flow drilling can be carried out with a flow drill which has a collar with an annular recess.
  • flow drilling may include drilling a plurality of axially aligned holes.
  • the tappet with rotation lock comprises a bottom and a cylindrical wall, the wall having at least one bore and at least one outer bead in the form of a web running around the at least one bore being arranged on an outside of the wall.
  • At least one inner bead in the form of a web running around the at least one bore can be arranged on an inside of the wall, with a through opening formed by the at least one bore, the associated outer bead and the associated inner bead is provided with a thread, and wherein a screw is screwed into the thread, a part of the screw projecting outward beyond the outer bead.
  • a screw head of the screw can be arranged on the outside of the wall.
  • the outer bead can have the shape of a hollow cylinder in an outer region.
  • the wall can have a plurality of bores, the plurality of bores being aligned with one another in the axial direction.
  • cup tappet is specified, which is produced by the method according to one of the above methods.
  • FIGs 1A and 1B illustrate in a cross section the inventive method according to a first embodiment.
  • a cup tappet blank (see Fig. 1A ) provided, which has a cup shape (or bowl shape) with a bottom 2 and a cylindrical wall 4.
  • Cylindrical wall ' should be understood here so that the wall has the shape of a hollow cylinder.
  • the cylindrical shape of the wall 4 defines an axial direction, a radial direction and a circumferential direction.
  • the tappet blank is produced in a known manner, for example by deep drawing, forging or a cutting process, and a combination is also possible.
  • the tappet blank is preferably rotationally symmetrical.
  • a cavity is formed by the base 2 and the wall 4 and is open on a side opposite the base 2.
  • This cavity defines an inside of the tappet blank and the subsequent tappet, in particular also the wall 4; the sides of the base 2 and wall 4 facing away from the cavity are correspondingly defined as the outside; the terms 'outside' and 'inside' refer to this accordingly. (These definitions therefore correspond to the usual designation of the inside and outside of a cup shape.)
  • the material for the cup tappet blank can be steel, a steel alloy, aluminum, brass or copper, for example.
  • a hole 6 is then drilled into the wall 4 of the tappet blank by means of flow drilling (see Fig. 4 and the associated description of the flow drilling process). This is done in such a way that an outer bead 8 is formed at least on the outside of the wall 4 (see Figure 1B ), which protrudes outwards beyond the wall 4, the outer bead 8 thus forms a projection on the outside of the wall 4.
  • an inner bead 10 will generally arise on the inside of the wall 4.
  • Outer bead 8 or inner bead 10 have the shape of a web, which extends around the bore 6. Flow drilling is preferably carried out from the outside. Flow drilling from the inside is also conceivable (if there is sufficient space).
  • the projection formed by the outer bead 8 can engage or protrude into a groove provided on a tappet guide (for example a guide bore in a cylinder head) in the installed state of the cup tappet, in order to prevent rotation of the cup tappet during operation.
  • a tappet guide for example a guide bore in a cylinder head
  • the material of the wall 4 that is already present is used to secure the rotation form, additional material and other workpieces (e.g. parts that are attached to the outside of the wall, e.g. by welding) are not necessary.
  • the flow drilling process also runs relatively quickly (approx. 5 seconds), so that short cycle times are possible.
  • an inner bead created during flow drilling can then be removed.
  • a cup tappet with rotation lock according to a second embodiment thus obtained is in cross section in Fig. 2 shown.
  • the in Figure 1B Inner bead 10 still present was removed, so that there is more space inside, for example for a valve holder. Otherwise, this applies to the second embodiment in connection with the first embodiment ( 1A, 1B ) Said, in particular, the outer bead 8 can continue to serve as a rotation lock by engaging in a corresponding groove.
  • FIGs 3A and 3B a third embodiment is shown.
  • a thread is introduced into the through-opening or bushing formed by the bore 6, the outer bead 8 and the inner bead 10 (see Figure 3A ).
  • the thread 12 is preferably introduced without cutting using a thread former.
  • a screw 14 can be screwed into the thread 12, ie the screw 14 can be screwed into the thread 12 (see Figure 3B ).
  • the screw 14 is screwed in or screwed in such that a part of the screw 14 protrudes outward beyond the outer bead 8 in order to serve as a rotation lock, ie this part of the screw 14 is provided to protrude into a corresponding groove. Because the thread 12 also extends over the outer bead 8 and the inner bead 10, there are sufficient threads to hold the screw 14 securely, although the wall 4 alone is generally not thick enough to accommodate a thread with a sufficient number To enable threads.
  • Screwing can be done from the outside or the inside.
  • a screw head 16 of the screw 14 comes to rest on the outside of the wall 4; the screw head 16 is then used to secure rotation, which is provided in a to engage the corresponding groove.
  • one end of the screw 14 facing away from the screw head serves as a rotation lock; this end should remain free of a thread of the screw 14.
  • a screw locking device can be provided, for example a screw locking adhesive.
  • a rotating flow drill 22 ie a flow drilling tool or flow drilling head, also referred to as a flow hole former
  • the flow drill 22 has a conical tip 24 at one end of a cylindrical part of the flow drill 22.
  • the flow drill 22 has a collar 26, which is spaced from the conical tip 24, at least by the thickness of the wall 20 to be drilled.
  • the conical tip 24 of the flow drill 22 Since the conical tip 24 of the flow drill 22 is pressed against the wall 20 and rotates in the process, arises by friction heat, which leads to heating of the material of the wall 20 at the drilling site and ultimately to plasticization of the material. This enables one Penetration of the flow drill 22 into the wall 20, the plasticized material being pressed aside to form beads on both sides of the wall 20 (see middle part of the figure). Finally, after the conical tip 24 of the flow drill 22 has completely penetrated the wall 20, the flow drill 22 is advanced until the collar strikes the bead on the drill side and presses it flat (see the right part of the figure).
  • the flow drilling process parameters eg flow drill rotation speed, flow drill feed pressure, flow drill feed speed, the size of the inner bead or outer bead can be controlled to a certain extent.
  • Fig. 5 shows in a cross section (for simplicity's sake without hatching) a flow drill 22 which is preferably used for the method according to the invention.
  • This has a collar 28 with an annular recess running around the cylindrical part of the flow drill 22 with a rectangular cross section, which is on the side of the Is located federally, which faces the conical tip 24; a rectangular cross section of the recess is preferred, but it is also possible to deviate from it, for example to provide a trapezoidal cross section.
  • the annular recess begins (radially) on the inside, based on the flow drill, directly on the cylindrical part of the flow drill 22 and extends outward over a portion of the collar 28 (radially), based on the flow drill.
  • the outer bead of the rotation lock in particular according to the first or second embodiment ( 1B, 2 ) to give a defined outer contour with a circular cylindrical surface, since the shape of the outer bead 8 is complementary to the shape of the recess on the collar 28. The dimensions are therefore not dependent on the flow behavior of the material.
  • the outer bead then has a defined radius in the areas that are used for guidance, so that the angular position of the bucket tappet relative to the cam can be determined by the groove in which the outer bead engages as a rotation lock (regardless of the flow behavior of the material contingent deviations).
  • the outer bead according to this embodiment has the shape of a hollow cylinder in an (radially, based on the cup tappet) outer region (ie at a free end of the bead).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP19185122.9A 2018-09-25 2019-07-09 Poussoir à coupelle à blocage de rotation et son procédé de fabrication Active EP3628831B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19185122T PL3628831T3 (pl) 2018-09-25 2019-07-09 Popychacz szklankowy z zabezpieczeniem rotacyjnym i sposób wytwarzania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018123539.9A DE102018123539B3 (de) 2018-09-25 2018-09-25 Tassenstössel mit rotationssicherung und verfahren zur herstellung

Publications (2)

Publication Number Publication Date
EP3628831A1 true EP3628831A1 (fr) 2020-04-01
EP3628831B1 EP3628831B1 (fr) 2021-01-13

Family

ID=67220681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19185122.9A Active EP3628831B1 (fr) 2018-09-25 2019-07-09 Poussoir à coupelle à blocage de rotation et son procédé de fabrication

Country Status (3)

Country Link
EP (1) EP3628831B1 (fr)
DE (1) DE102018123539B3 (fr)
PL (1) PL3628831T3 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001132413A (ja) * 1999-11-08 2001-05-15 Toyota Motor Corp 内燃機関用バルブリフタ及びその製造方法
US20070170025A1 (en) * 2006-01-25 2007-07-26 Performance Automotive Group, Inc. Dual cylinder shock and method therefor
WO2017187329A1 (fr) * 2016-04-29 2017-11-02 Kauno technologijos universitetas Outil combiné de forage et de taraudage sans enlèvement de copeaux
EP3375542A1 (fr) * 2017-03-16 2018-09-19 Bollhoff Otalu S.A. Procédé d'assemblage d'un insert sur un support, et insert à assembler sur un support

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429171A (en) * 1965-10-21 1969-02-25 Joseph J Feher Radius spin drill
JP3700409B2 (ja) * 1998-09-04 2005-09-28 トヨタ自動車株式会社 ３次元カム用バルブリフタおよび可変動弁装置
JP5496696B2 (ja) * 2010-01-27 2014-05-21 Ｎｔｎ株式会社 ポンプ用タペット

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001132413A (ja) * 1999-11-08 2001-05-15 Toyota Motor Corp 内燃機関用バルブリフタ及びその製造方法
US20070170025A1 (en) * 2006-01-25 2007-07-26 Performance Automotive Group, Inc. Dual cylinder shock and method therefor
WO2017187329A1 (fr) * 2016-04-29 2017-11-02 Kauno technologijos universitetas Outil combiné de forage et de taraudage sans enlèvement de copeaux
EP3375542A1 (fr) * 2017-03-16 2018-09-19 Bollhoff Otalu S.A. Procédé d'assemblage d'un insert sur un support, et insert à assembler sur un support

Also Published As

Publication number Publication date
EP3628831B1 (fr) 2021-01-13
PL3628831T3 (pl) 2021-07-05
DE102018123539B3 (de) 2020-02-06

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