NO123426B - - Google Patents
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- Publication number
- NO123426B NO123426B NO162027A NO16202766A NO123426B NO 123426 B NO123426 B NO 123426B NO 162027 A NO162027 A NO 162027A NO 16202766 A NO16202766 A NO 16202766A NO 123426 B NO123426 B NO 123426B
- Authority
- NO
- Norway
- Prior art keywords
- piston head
- corrugations
- ribs
- cone
- piston
- Prior art date
Links
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/02—Special design or construction
- B21J7/14—Forging machines working with several hammers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/20—Drives for hammers; Transmission means therefor
- B21J7/22—Drives for hammers; Transmission means therefor for power hammers
- B21J7/34—Drives for hammers; Transmission means therefor for power hammers operating both the hammer and the anvil, so-called counter-tup
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Stempel for forbrenningsmotor. Piston for internal combustion engine.
Oppfinnelsen vedrører stempler for forbrenningsmotorer. Mere spesielt vedrø-rer oppfinnelsen stempelhoder for bruk ved store motorer, spesielt Diesel-motorer hvor spesielle temperatur- og trykkproblemer oppstår. The invention relates to pistons for internal combustion engines. More particularly, the invention relates to piston heads for use with large engines, especially Diesel engines where special temperature and pressure problems arise.
Stempler ved store forbrenningsmotorer oppviser et konstruksjonsproblem fordi stempelhodet utsettes for temperaturer og trykk som er høye og som også allikevel varierer i rask rekkefølge. Følgelig har stempelhodene en tendens til å sprekke. Det er antatt at sprekkene oppstår av termiske spenninger, og deretter forstørres og forlenges av de spenninger som ér en følge av variasjonen i gasstrykket. Pistons in large internal combustion engines present a design problem because the piston head is exposed to temperatures and pressures which are high and which nevertheless vary in rapid succession. Consequently, the piston heads tend to crack. It is assumed that the cracks arise from thermal stresses, and are then enlarged and lengthened by the stresses that are a consequence of the variation in gas pressure.
Tykkelsen av det metall som anvendes i stempelhodet må selvfølgelig være slik at det er istand til å motstå de høye gass-trykk, og det skal forstås at de termiske spenninger i stempelhodet er uunngåelige ved store motorer på grunn av den store metalltykkelse. Av denne grunn er det van-lig å avkjøle stempelhodet og således re-dusere de termiske spenningene ved å sir-kulere en kjølevæske, som f. eks. olje eller vann gjennom stemplet. The thickness of the metal used in the piston head must of course be such that it is able to withstand the high gas pressures, and it must be understood that the thermal stresses in the piston head are unavoidable in large engines due to the large metal thickness. For this reason, it is common to cool the piston head and thus reduce the thermal stresses by circulating a coolant, such as e.g. oil or water through the piston.
Formålet for den foreliggende oppfinnelse er å tilveiebringe et væskekjølet stempelhode således utført at det kan kjø-les mere effektivt enn de som er i almin-nelig bruk i dag og således har mindre tendens til å sprekke. The purpose of the present invention is to provide a liquid-cooled piston head designed in such a way that it can be cooled more effectively than those in general use today and thus has less tendency to crack.
Ifølge oppfinnelsen er den indre overflate utstyrt med korrugeringer eller ribber for å oppnå forbedret væskékjøling av hodet, og karakteriseres ved åt korrugeringene eller ribbene strekker seg mot spissen av konen eller kjeglen i plan som innbefatter kjeglens akse. According to the invention, the inner surface is equipped with corrugations or ribs to achieve improved liquid cooling of the head, and is characterized by the fact that the corrugations or ribs extend towards the tip of the cone or cone in a plane that includes the axis of the cone.
En utførelsesform for stempelhodet ifølge oppfinnelsen er vist' på de hosføyde tegninger, hvor: fig. 1 er et vertikalt snitt gjennom den øvre delen av et væskekjølet stempel, og An embodiment of the piston head according to the invention is shown in the accompanying drawings, where: fig. 1 is a vertical section through the upper part of a liquid-cooled piston, and
fig. 2 er et snitt langs linjen II—II på figur 1. fig. 2 is a section along the line II—II in figure 1.
Fig. 1 viser et stempelhode 10 på et stort Dieselmotorstempel, idet et stempelhode e.r forbundet til en stempelstang 12. Stempelstangen 12 har en passasje 14 og en utløpskanal 16 for tilføring av kjøle-væske til den indre overflate 18 i stempelhodet, og en annen passasje 20 for utfø-ring a<y> kjølevæske fra et lite sentralt an-brakt kammer 22 i stempelhodet. Fig. 1 shows a piston head 10 on a large Diesel engine piston, a piston head being connected to a piston rod 12. The piston rod 12 has a passage 14 and an outlet channel 16 for supplying coolant to the inner surface 18 of the piston head, and another passage 20 for carrying out coolant from a small, centrally placed chamber 22 in the piston head.
Den indre overflate 18 i stempelhodet har en stort sett konisk form og er korru-gert eller ribbet. De tolv korrugeringene eller ribbene 24 strekker seg mot spissen av kjeglen i plan som inneslutter senter-aksen C i kjeglen. Korrugeringene eller ribbene er passende dype sammenlignet med den metalltykkelse som er anvendt i stempelhodet, og tykkelsen av metallet ved X-X på figur 2 er omkring halvparten av me-talltykkelsen ved Y—Y. The inner surface 18 in the piston head has a largely conical shape and is corrugated or ribbed. The twelve corrugations or ribs 24 extend towards the tip of the cone in a plane which encloses the center axis C of the cone. The corrugations or ribs are suitably deep compared to the metal thickness used in the piston head, and the thickness of the metal at X-X in Figure 2 is about half the metal thickness at Y-Y.
Den lavere delen av stempelhodet er konstruert slik at kjølevæske, som f. eks. olje eller vann, tilføres gjennom passasjen 14 og utløpskanalen 16 og kan vaske over korrugeringene og ribbene 24 og således av-kjøle metallet. Anbringelsen av korrugeringene eller ribbene resulterer i en økning av den overflate som er utsatt for kjøle-væskeh og følgelig oppnår en en mere ef-fektiv kjøling av den ytre eller øvre overflate 26 på stempelhodet som er utsatt for de hete forbrenningsprodukter. The lower part of the piston head is designed so that coolant, such as e.g. oil or water, is supplied through the passage 14 and the outlet channel 16 and can wash over the corrugations and ribs 24 and thus cool the metal. The placement of the corrugations or ribs results in an increase of the surface exposed to coolant and consequently a more effective cooling of the outer or upper surface 26 of the piston head exposed to the hot combustion products is achieved.
En viktig fordel ved den foreliggende oppfinnelse er at den mekaniske styrken til stempelhodet er opprettholdt mens me-: tall tykkelsen mellom kjølevæsken og over-flaten 26 som er utsatt for forbrennings-produktene er redusert. Temperaturfallet inne i metallet i stempelhodet er derfor redusert og metallet behøver ikke å motstå slike høye termiske spenninger. En videre fordel er at stempelhodet ikke teride-rer å deformeres, noe som' kan vise seg å være meget problematisk på grunn av de krefter som et deformert stempelhode ut-øver mot stemplets hoveddeler. An important advantage of the present invention is that the mechanical strength of the piston head is maintained while the metal thickness between the coolant and the surface 26 which is exposed to the combustion products is reduced. The temperature drop inside the metal in the piston head is therefore reduced and the metal does not have to withstand such high thermal stresses. A further advantage is that the piston head does not tend to be deformed, which can prove to be very problematic due to the forces which a deformed piston head exerts against the main parts of the piston.
Kjølingen av stempelhodet er videre forbedret ved anbringelsen av passasjene 28 i korrugeringene eller ribbene 24. Kjøle-væsken går inn i disse passasjer, ved deres ytterender og strømmer gjennom dem til inherendene, m.a.o. endene nærmere spissen av den koniske overflate, hvor passasjene går inn i kammeret 22. Væsken strømmer ut av kammeret 22 inn i passasjen 20 og tilbake til tilførselskilden. The cooling of the piston head is further improved by the placement of the passages 28 in the corrugations or ribs 24. The coolant enters these passages at their outer ends and flows through them to the inner ends, i.e. the ends closer to the tip of the conical surface, where the passages enter the chamber 22. The liquid flows out of the chamber 22 into the passage 20 and back to the supply source.
Metallet som anvendes i stempelhodet behøver selvfølgelig ikke være det samme i alle tilfeller, men det er funnet at fin-kornet støpejern er meget anvendelig både fra et fremstilling- og fra et driftsmessig synspunkt. The metal used in the piston head does not of course have to be the same in all cases, but it has been found that fine-grained cast iron is very applicable both from a manufacturing and operational point of view.
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH321665A CH436932A (en) | 1965-03-09 | 1965-03-09 | Machine for forging continuous metal strip |
Publications (1)
Publication Number | Publication Date |
---|---|
NO123426B true NO123426B (en) | 1971-11-15 |
Family
ID=4251152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO162027A NO123426B (en) | 1965-03-09 | 1966-03-09 |
Country Status (11)
Country | Link |
---|---|
US (1) | US3415106A (en) |
AT (1) | AT258676B (en) |
BR (1) | BR6677409D0 (en) |
CH (1) | CH436932A (en) |
DE (1) | DE1552949C3 (en) |
ES (1) | ES323909A1 (en) |
FR (1) | FR1470931A (en) |
GB (1) | GB1123454A (en) |
NL (1) | NL146411B (en) |
NO (1) | NO123426B (en) |
SE (1) | SE332611B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3921429A (en) * | 1974-04-11 | 1975-11-25 | Tadeusz Sendzimir | Process and apparatus for modifying the cross section of a slab |
CN1815041A (en) * | 2005-02-06 | 2006-08-09 | 何扬东 | Concrete pump hydraulic system auxiliary energy-storage flow-increasing device |
CN1815040A (en) * | 2005-02-06 | 2006-08-09 | 何扬东 | Concrete pump hydraulic system auxiliary energy-storage flow-increasing device (2) |
CN107661957A (en) * | 2017-09-28 | 2018-02-06 | 江苏宏程锻压机床有限公司 | Reservoir formula is passive once to forge type equipment |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1206193A (en) * | 1915-11-03 | 1916-11-28 | Ralph E Bates | Pneumatic power-hammer. |
US2232889A (en) * | 1938-12-23 | 1941-02-25 | Spencer Frank William | High-speed forging press |
-
1965
- 1965-03-09 CH CH321665A patent/CH436932A/en unknown
-
1966
- 1966-02-15 NL NL666601913A patent/NL146411B/en unknown
- 1966-02-28 BR BR177409/66A patent/BR6677409D0/en unknown
- 1966-03-03 DE DE1552949A patent/DE1552949C3/en not_active Expired
- 1966-03-07 ES ES0323909A patent/ES323909A1/en not_active Expired
- 1966-03-07 US US532474A patent/US3415106A/en not_active Expired - Lifetime
- 1966-03-08 SE SE03049/66A patent/SE332611B/xx unknown
- 1966-03-09 NO NO162027A patent/NO123426B/no unknown
- 1966-03-09 AT AT222866A patent/AT258676B/en active
- 1966-03-09 FR FR52786A patent/FR1470931A/en not_active Expired
- 1966-03-09 GB GB10347/66A patent/GB1123454A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1470931A (en) | 1967-02-24 |
DE1552949B2 (en) | 1974-05-22 |
AT258676B (en) | 1967-12-11 |
BR6677409D0 (en) | 1973-05-29 |
GB1123454A (en) | 1968-08-14 |
US3415106A (en) | 1968-12-10 |
DE1552949A1 (en) | 1970-02-12 |
SE332611B (en) | 1971-02-15 |
NL6601913A (en) | 1966-09-12 |
CH436932A (en) | 1967-05-31 |
DE1552949C3 (en) | 1974-12-12 |
ES323909A1 (en) | 1966-12-01 |
NL146411B (en) | 1975-07-15 |
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