EP3452711A1 - Piston - Google Patents

Piston

Info

Publication number
EP3452711A1
EP3452711A1 EP17718518.8A EP17718518A EP3452711A1 EP 3452711 A1 EP3452711 A1 EP 3452711A1 EP 17718518 A EP17718518 A EP 17718518A EP 3452711 A1 EP3452711 A1 EP 3452711A1
Authority
EP
European Patent Office
Prior art keywords
piston
slot
skirt
width
mean width
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.)
Withdrawn
Application number
EP17718518.8A
Other languages
German (de)
English (en)
Inventor
Klaus Lormes
Edward Werninghaus
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt 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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP3452711A1 publication Critical patent/EP3452711A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/04—Resilient guiding parts, e.g. skirts, particularly for trunk pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • F02F3/025—Pistons  having means for accommodating or controlling heat expansion having circumferentially slotted piston skirts, e.g. T-slots

Definitions

  • the invention relates to a piston of an internal combustion engine having an upper part and a lower part, wherein the upper part has at least one annular field and the lower part is formed by opposite pin holes and piston shanks, according to the features of the preamble of claim 1.
  • Pistons of internal combustion engines which are integrally formed in the operational state and are integral in their manufacture or can be formed from two or more parts are known. Regardless of whether a piston blank has been produced in one piece or in several parts to produce a ready-to-use piston, such pistons have an upper part which comprises a ring field. Optionally, a combustion bowl and other elements of the piston can be provided in this region of the upper part. Attached to the upper part is in a manner known per se the piston skirt area, which for example is continuous cylindrical or from opposite piston shanks (supporting shaft wall sections). In the region of the lower part there are also opposite pin holes which penetrate either the piston skirt or connecting walls connecting the supporting skirt wall sections.
  • a piston is known from DE 10 2009 032 916 A1.
  • the invention has for its object to improve such a known piston in terms of its operating characteristics when used in a cylinder of an internal combustion engine.
  • a slot is arranged between the upper part and at least one piston skirt.
  • the piston shaft remains connected to the upper part, it can be partially decoupled by means of the slot of the upper part and thus advantageously the stiffness of the piston skirt can be selectively reduced depending on the geometry of the slot.
  • such a slot leads to a reduction in the friction of the piston skirt and also to a significant noise reduction.
  • the configuration of the height and the width of the slot depends on the occurring lateral forces, the piston total height and the shaft length.
  • a design clearance % range
  • this% range can be set by FEA calculations.
  • the slot between the lowermost annular groove of the annular field and the upper edge of the piston skirt, with which the piston skirt merges into the upper part is arranged. If the slot is arranged at this point, a particularly good partial decoupling of the rigidity of the shaft is achieved by the upper part of the piston.
  • the slot has a mean width B1 and the piston shaft has a mean width B2, where B2 ⁇ B1.
  • the slot has a mean width B1 of 70% to 90% of the mean width B2 of the piston skirt.
  • the slot has a mean width B1 and the piston shaft has a mean width B2, where B2> B1.
  • B1 the box walls (connecting walls between the supporting shaft wall sections) on pistons can be made wider and thus also the shaft surfaces larger than necessary for the lateral forces that occur is. In this case, a flexibility or expansion of the% range is necessary in order to be able to respond to these special geometric conditions.
  • the mean width of the slot or of the piston shaft is to be understood as meaning that the respective width is determined either by the plan view of the cylindrical region in which the slot and piston shaft are located (two-dimensional view) or that the average width is the partial circumference in the course corresponds to the slot or the piston shaft.
  • the slot has a height which is 0.25% to 3.5% of the outer diameter of the piston.
  • the slot has a height which is 3.5% to 5% of the outer diameter.
  • the height of the slot, but also the width of the slot are dependent on a cost-optimal manufacturing process to choose. Depending on which manufacturing process is integrated in a production line or can be integrated, this must be taken into account in the slot design. For example, by machining with a saw blade small slot heights ( ⁇ 0.5 mm) can be implemented more economically than, for example, by milling. Again, for example, by milling a greater freedom of design of the slot geometry (height and / or width and / or geometry) is given.
  • the slit design must be designed so that a good compromise between shaft decoupling and sufficient component strength can be implemented.
  • the end regions of the slot are aligned parallel to a transverse axis of the piston.
  • the end portions of the slot are oriented at an angle ⁇ to a transverse axis of the piston.
  • ⁇ is an angle perpendicular to a pin bore axis.
  • the end regions of the slot are formed by a bore.
  • the diameter of the bore is smaller than or equal to or greater than the height of the slot.
  • FIGS. 1 to 4 show a first exemplary embodiment of a piston according to the invention
  • FIGS. 5 to 7 show a second exemplary embodiment.
  • Both embodiments are based on the same geometry of the piston 1, wherein the differences relate to the embodiments of the slot according to the invention, which will be described in detail.
  • a ring field here with three annular grooves
  • the lower part 3 has in a conventional manner opposite pin holes 4 and also opposite piston shanks 5.
  • the piston 1 shown in Figures 1 to 7 is a piston in the box design, wherein the two opposite Kolben2020fte 5 (supporting shaft wall sections) are interconnected via unspecified connecting walls and wherein in each connecting wall in each case the pin bore 4, which is surrounded by a pin boss , is arranged.
  • a slot 6 is inserted into the piston 1 between the upper part 2 and the lower part 3.
  • the slot 6 extends from a piston stroke axis in the further course in the piston shaft 5 in the direction of a respective pin bore 4 in the same longitudinal extent, wherein an asymmetrical arrangement of the slot 6 with respect to the piston stroke 7 is conceivable. Partial decoupling of the piston shaft 5 from the upper part 2 in order to reduce the rigidity of the shaft region of the piston 1 takes place in an advantageous manner by means of the slot 6.
  • a pin bore axis 8 extends through the pin bore 4 and a transverse axis 9 is perpendicular to the pin bore axis 8.
  • the slot 6 is not only introduced into the surface of the piston 1, but penetrates the region, for example the transition region, the upper edge of the piston shaft 5, with which it merges into the lower region of the upper part 2, completely into an inner region 10 of the piston 1, wherein this inner region 10 extends behind the piston skirt and between the two connecting walls connecting the piston shafts 5.
  • FIG. 3 shows that the slot 6 has a width B1 and the piston shaft 5 has a width B2.
  • These two average widths can be determined, for example, by considering the three-dimensional operational piston 1 in this way two-dimensionally and, according to this approach, determining the two widths B1 and B2. Alternatively, they can also be determined three-dimensionally by measuring the partial circumference of the ready-to-use piston 1.
  • the at least one end region, preferably both end regions, of the slot 6 are aligned at an angle ⁇ with respect to the transverse axis 9.
  • ⁇ is aligned at an angle ⁇ with respect to the transverse axis 9.
  • other courses are conceivable, such as, for example, a parallel course of the end area with respect to the transverse axis 9.
  • FIGS. 5 to 7 in principle, the same design of the piston 1 is shown as in FIGS. 1 to 4. The only difference is that one end region of the slot 6, here both end regions, is closed with a bore 11.
  • the diameter of the bore 1 1 is greater than the height of the slot 6.
  • the diameter of the bore 1 1 corresponds to the height of the slot 6 or is smaller.
  • the slot 6 penetrates the upper area of the piston shaft 5 into the inner area 10 for decoupling the piston shaft 5 from the upper part 2.
  • the longitudinal axis of the bore 11 can be set to the transverse axis 9, wherein other courses (such as, for example, parallel to the transverse axis) are also conceivable. LIST OF REFERENCE NUMBERS

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Piston (1) d'un moteur à combustion interne, comprenant une partie supérieure (2) et une partie inférieure (3), la partie supérieure (2) présentant au moins une zone de segmentation et la partie inférieure étant formée d'alésages d'axe de piston (4) et de jupes de piston (5) en regard, une fente (6) étant située entre la partie supérieure (2) et au moins une jupe de piston (5).
EP17718518.8A 2016-05-02 2017-04-19 Piston Withdrawn EP3452711A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016207494 2016-05-02
PCT/EP2017/059250 WO2017190952A1 (fr) 2016-05-02 2017-04-19 Piston

Publications (1)

Publication Number Publication Date
EP3452711A1 true EP3452711A1 (fr) 2019-03-13

Family

ID=58579166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17718518.8A Withdrawn EP3452711A1 (fr) 2016-05-02 2017-04-19 Piston

Country Status (3)

Country Link
EP (1) EP3452711A1 (fr)
DE (1) DE102017108271A1 (fr)
WO (1) WO2017190952A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021013788A1 (fr) 2019-07-19 2021-01-28 Ks Kolbenschmidt Gmbh Piston pour un moteur à combustion interne, avec réduction de la puissance de frottement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6453446U (fr) * 1987-09-30 1989-04-03
JPH078544U (ja) * 1993-06-29 1995-02-07 株式会社ユニシアジェックス 内燃機関用ピストン
JPH11280544A (ja) * 1998-03-31 1999-10-12 Unisia Jecs Corp 内燃機関用ピストン
JP2005069219A (ja) * 2003-06-12 2005-03-17 Hitachi Metals Ltd 内燃機関用ピストン
US8146560B2 (en) 2008-11-05 2012-04-03 Mahle International Gmbh Multi-part piston for an internal combustion engine and method for its production

Also Published As

Publication number Publication date
WO2017190952A1 (fr) 2017-11-09
DE102017108271A1 (de) 2017-11-02

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