EP3452712A1 - Piston - Google Patents

Piston

Info

Publication number
EP3452712A1
EP3452712A1 EP17720814.7A EP17720814A EP3452712A1 EP 3452712 A1 EP3452712 A1 EP 3452712A1 EP 17720814 A EP17720814 A EP 17720814A EP 3452712 A1 EP3452712 A1 EP 3452712A1
Authority
EP
European Patent Office
Prior art keywords
piston
recess
outer ring
connecting wall
inner ring
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.)
Pending
Application number
EP17720814.7A
Other languages
German (de)
English (en)
Inventor
Klaus Lormes
Willi Sikorsky
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 EP3452712A1 publication Critical patent/EP3452712A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • 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 
    • F02F3/0015—Multi-part 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding

Definitions

  • the invention relates to a piston of an internal combustion engine, formed by an upper part joined together with a lower part, wherein the lower part of opposite the outer diameter of the piston recessed and recessed connecting walls is formed, each having a connecting wall has a pin bore and the respective end of each connecting wall in a piston stem passes, according to the features of the preamble of claim 1.
  • a generic piston is known from DE 102005 041 001.
  • the invention has for its object to provide a piston of an internal combustion engine, which is improved over generic pistons in terms of its production, but in particular in terms of which the weight is further reduced without the stability of the piston during operation in the cylinder of the internal combustion engine thereby limited becomes.
  • the lower part has at least one recess facing the upper part and the upper part has at least one recess facing the lower part, wherein the recesses overlap after assembly, wherein furthermore a permanent connection between the lower part and the upper part forms a positive fit Connection is and the positive connection is formed by at least one spring and at least one operatively engageable groove.
  • the at least one recess of the lower part (and thus also corresponding to the recess of the upper part) is arranged above and outside the connecting wall.
  • the at least one local recess formed by the joining of the upper part and the lower part is arranged below the upper part of the piston and is located outside the inner region of the piston, so that material can be saved at points in which the piston is not heavily loaded.
  • the invention provides that the at least one recess of the lower part (and thus also the corresponding at least one recess of the upper part) is arranged above and within the two connecting walls. This also makes it possible to save material of the piston at locations which are arranged above the inner region, that is to say between the two connecting walls and the two opposite supporting shaft wall sections. This is especially true when the piston has no combustion bowl. Valve pockets that are flat can but need not exist.
  • a wall region of the connecting wall transitions seamlessly into a wall region of the at least one recess of the lower part. If the at least one recess in the lower part (and also in the upper part) is arranged above the connecting wall, it is advantageous that a transition from the wall region of the connecting wall to the wall region of the at least one local recess transitions over, so that here too sharp-edged transitions , step-like transitions or the like are avoided to counteract cracking.
  • This seamless transition can, but need not be arranged in the region of a joining plane between the upper part and lower part. He can also be realized in an advantageous manner by the positive connection (spring-groove principle) very easy.
  • a recess of the lower part above the pin hole and a respective recess of the lower part is arranged above next to the pin bore.
  • FIG. 1 shows a still unfinished piston 1, which is formed by a lower part 2 and a upper part 3. These two parts 2, 3 are separated in a suitable manner (identical or different materials, identical or different production methods and the like) made from each other. 4 designates a pin bore in FIG.
  • Figure 2 shows the upper part 3 in a plan view from below, wherein the plane shown facing the lower part 2, when these two parts 2, 3 are joined together.
  • the upper part 3 has at least one local recess, here in each case three local recesses 5 symmetrically to a transverse axis of the upper part 3.
  • the location and number of recesses 5 is exemplary and may vary in location and / or number.
  • a transverse to the transverse axis of the upper part 3 arranged central local recess 5 is present.
  • Figure 3 shows the lower part 2, which comprises a piston skirt 6, the opposite opposite another not shown piston skirt opposite.
  • This piston shaft 6 is formed as a supporting shaft wall portion and is connected by two approximately parallel and inclined connecting walls (inclined with respect to the Kolbenhubachse).
  • an outer ring 8 may be present, from which at least one web, in this case a plurality of webs 9, extend in the direction of the center of the piston.
  • the reference numeral 12 denotes at least one recess in the lower part 2, which can basically be provided at a suitable location for the purpose of saving material.
  • a recess 12 extending within the central region 11 and in the direction of the piston shanks 6, which is thus located above a middle region of the lower part 2.
  • a recess 12 (or two recesses 12 symmetrical to a transverse axis of the lower part 2) is provided, which is arranged above the pin bore 4.
  • the pin bore 4 arranged recess 12 are each a recess 12 right and left next to and above the Bolzenbohmng 4 available.
  • the outer ring 8 of the lower part 2 corresponds to an outer ring 13 ( Figure 2) of the upper part 3. Exactly corresponds to the respective web 9 of the lower part 2 with associated webs 14 ( Figure 2) of the upper part 3. Also, the inner ring 10 corresponds to a inner ring 15 ( Figure 2) of the upper part. 3
  • the mutually facing bearing surfaces and the respective local recesses for the purpose of weight saving are preferably symmetrical and overlapping.
  • the same can also apply to the central region 11, but need not, as can be seen from FIG.
  • FIG. 3 it can be seen very clearly that the wall region of the recesses 12 arranged above and next to the pin bore transitions seamlessly into the wall region of the connecting wall.
  • the recess 12 of the lower part 2 merges into the corresponding recess 5 of the upper part 3.
  • the recesses 5/12 which overlap also have no transition after assembly.
  • FIG. 4 shows an operational piston 1, in which the lower part 2 and the upper part 3 have been joined to each other in an undetachable manner in a suitable manner. Also recognizable are the opposing piston shafts 6 and connecting the piston shafts 6 connecting walls 7, in which the pin bore 4 is arranged.
  • FIG. 5 shows the piston according to FIG. 4 in a view from below.
  • the horizontal and vertical course of the connecting walls 7 can be seen, which also include the pin bore 4 surrounding bolt hubs.
  • This outwardly directed course as well as the course or shaping of the connecting walls 7 facing into the interior of the piston 1 is particularly important, since they support the introduction of the local recesses in the two parts 2, 3 and at the same time optimally support the piston crown (formed by the latter) Support upper part 3).
  • FIGS. 6 to 9 show an exemplary embodiment of a piston 1 which largely has the same structural details as the piston 1 according to FIGS. 1 to 5.
  • a permanent connection between the lower part 2 and the upper part 3 is a positive connection.
  • This positive connection is formed, as shown in Figure 7, of at least one spring 16 and at least one operable engageable groove 17.
  • the spring 16 for example, on the upper part 13 and the groove 17 on the lower part 2 (and / or conversely).
  • this system is as shown in Figure 6 is multiple times.

Landscapes

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

Abstract

L'invention concerne un piston (1) d'un moteur à combustion interne, constitué d'une partie supérieure (3) assemblée à une partie inférieure (2), la partie inférieure (2) étant constituée de parois de liaison (7) opposées en retrait par rapport au diamètre extérieur du piston (1) et inclinées, une paroi de liaison (7) présentant respectivement un alésage d'axe (4) et chaque extrémité de chaque paroi de liaison (7) rejoignant une tige de piston (6). La partie inférieure (2) présente au moins un évidement (12) orienté dans la direction de la partie supérieure (3), et la partie supérieure (3) présente au moins un évidement (5) orienté dans la direction de la partie inférieure (2), les évidements (5, 12) se recouvrant après l'assemblage, et une liaison permanente entre la partie inférieure (2) et la partie supérieure (3) est réalisée sous la forme d'une liaison par complémentarité de forme, la liaison par complémentarité de forme étant formée par moins un ressort (16) et au moins rainure (17) pouvant être mise en liaison fonctionnelle avec ledit ressort.
EP17720814.7A 2016-05-04 2017-05-03 Piston Pending EP3452712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016108271 2016-05-04
PCT/EP2017/060534 WO2017191189A1 (fr) 2016-05-04 2017-05-03 Piston

Publications (1)

Publication Number Publication Date
EP3452712A1 true EP3452712A1 (fr) 2019-03-13

Family

ID=58664721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17720814.7A Pending EP3452712A1 (fr) 2016-05-04 2017-05-03 Piston

Country Status (6)

Country Link
US (1) US11162453B2 (fr)
EP (1) EP3452712A1 (fr)
CN (1) CN109312688A (fr)
DE (1) DE102017109471A1 (fr)
MX (1) MX2018013353A (fr)
WO (1) WO2017191189A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005041001A1 (de) * 2005-08-29 2007-03-22 Ks Kolbenschmidt Gmbh Leichtbaukolben
DE102014204774A1 (de) * 2013-03-15 2014-09-18 Ks Kolbenschmidt Gmbh Zweiteiliger Stahlkolben, Fügeprozess

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DE102017109471A1 (de) 2017-11-09
CN109312688A (zh) 2019-02-05
US20190145344A1 (en) 2019-05-16
US11162453B2 (en) 2021-11-02
WO2017191189A1 (fr) 2017-11-09

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