WO2010051843A1 - Vilebrequin démontable à pièces multiples - Google Patents

Vilebrequin démontable à pièces multiples Download PDF

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Publication number
WO2010051843A1
WO2010051843A1 PCT/EP2008/065051 EP2008065051W WO2010051843A1 WO 2010051843 A1 WO2010051843 A1 WO 2010051843A1 EP 2008065051 W EP2008065051 W EP 2008065051W WO 2010051843 A1 WO2010051843 A1 WO 2010051843A1
Authority
WO
WIPO (PCT)
Prior art keywords
crankpin
crankshaft
tapered
recess
disassembling
Prior art date
Application number
PCT/EP2008/065051
Other languages
English (en)
Inventor
Lambertus Hendrik De Gooijer
Original Assignee
Gomecsys B.V.
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 Gomecsys B.V. filed Critical Gomecsys B.V.
Priority to PCT/EP2008/065051 priority Critical patent/WO2010051843A1/fr
Publication of WO2010051843A1 publication Critical patent/WO2010051843A1/fr

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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • F16C3/10—Crankshafts assembled of several parts, e.g. by welding by crimping
    • F16C3/12—Crankshafts assembled of several parts, e.g. by welding by crimping releasably connected

Definitions

  • the invention relates to a crankshaft comprising at least a crankpin.
  • crankshafts for reciprocating piston mechanisms are usually formed of one piece.
  • it is desired to assemble a crankshaft of separate parts for example in case of a reciprocating piston mechanism wherein non- separated parts need to be fitted onto the crankpin, such as a connecting rod made of one piece.
  • PCT/EP2008/051727 of the same applicant as the current application discloses a reciprocating piston mechanism in which a crankshaft made of separate parts is desired for assembling the mechanism.
  • the object of the invention is to provide an innovative crankshaft.
  • This object is achieved by the crankshaft according to the invention which is characterized in that the crankpin comprises at least a first crankpin part and a second crankpin part which are fixed to each other by fixing means, wherein the first crankpin part is provided with a tapered recess and the second crankpin part is provided with a tapered protrusion fitting in the tapered recess of the first crankpin part.
  • crankshaft according to the invention is that it can be manufactured relatively easily, whereas is provides a rigid structure. Besides, due to the tapered connections the first and second crankpin parts can be easily loosened from each other, which may be desired in case of maintenance or in case of experimental reciprocating piston engines. It will be clear to the skilled person that the tapered recess is widest at the free end of the first crankpin part and smallest at the bottom portion of the recess so as to be able to receive the tapered protrusion of the second crankpin part.
  • the inclination angle of the tapered portions of the first and second crankpin parts lies within 6-10° with respect to the centre line of the crankpin, because it appears that loosening of the first and second crankpin parts is relatively easy within that range.
  • the tapered recess may be provided at an end portion of the first crankpin part, which also forms an end portion of the crankpin. This means that the end portion of the first crankpin part is adjacent to a crank arm.
  • the biggest part of the circumferential crankpin surface is a continuous surface between crank arms which are located at the ends of the crankpin.
  • the second crankpin part may be used for coupling it to the first crankpin part without directly bearing a connecting rod, for example.
  • the second crankpin part may be provided with a second tapered recess whereas the tapered protrusion is part of a fitting member which fits in the second tapered recess of the second crankpin part and which is fixed to the second crankpin part.
  • the fitting member may be adapted such that in an assembled condition at least a portion of the ends of the first and second crankpin parts are free of contact. This provides the opportunity to locate an oil channel through the crankpin to the opening between the ends of the first and second crankpin parts.
  • the fitting member may comprise a through hole extending parallel to the centre line of the crankpin. This allows to insert a bolt, for example, through the through hole so as to fix the first and second crankpin parts to each other.
  • the invention is also related to an internal combustion engine which comprises a crankshaft as defined hereinbefore .
  • the invention is also related to a method of manufacturing a crankshaft comprising at least a crankpin, comprising the following steps: supplying an intermediary crankshaft being made of one piece and comprising at least an intermediary crank-pin; cutting the intermediary crankpin hence creating a first crankpin part and a second crankpin part; manufacturing a tapered recess into an end portion of the first crankpin part in a direction along its longitudinal centre line; manufacturing a tapered protrusion at an end portion of the second crankpin part projecting in a direction along its longitudinal centre line; wherein the recess and protrusion are manufactured such that they fit to each other; fitting and fixing the first crankpin part and the second crankpin part to each other.
  • the tapered protrusion may be manufactured at an end portion of the second crankpin part by manufacturing a second tapered recess in the second crankpin part at the end portion thereof projecting in a direction along its longitudinal centre line and then fitting a double tapered fitting member into the second tapered recess.
  • the invention is also related to a method of disassembling a crankshaft as defined hereinbefore, wherein a disassembling bolt including a bolt disassembling thread is screwed into a mating disassembling thread of the second crankshaft part, whereas an end of the disassembling bolt spaced from the disassembling thread is put in contact with a portion of the first crankshaft part without being attached thereto upon turning the disassembling bolt.
  • This is a simple method for pressing the first crankshaft part and the second crankshaft part in opposite directions upon turning the disassembling bolt about its longitudinal axis.
  • FIG. 1 is an exploded perspective view of an embodiment of the crankshaft according to the invention.
  • Fig. 2 is a similar view as Fig. 1, showing the crankshaft in assembled condition.
  • Fig. 3 is a similar view as Fig. 1 of an alternative embodiment of the crankshaft.
  • Fig. 4 is a similar view as Fig. 3, showing the crankshaft in assembled condition.
  • Fig. 5 is a cross-sectional view of the embodiment as shown in Fig. 4.
  • Fig. 6 is a perspective cross-sectional view of the embodiment of Fig. 4 at a different scale, illustrating a method of disassembling the crankshaft.
  • the crankshaft according to the invention is made of separate parts.
  • Such a crankshaft is desired, for example, in case of a reciprocating piston mechanism such as an internal combustion engine wherein non-separated parts need to be fitted onto the crankpin, such as a connecting rod made of one piece.
  • Figs. 1 and 2 show an embodiment of a crankshaft 1 according to the invention in disassembled and assembled condition, respectively.
  • the crankshaft 1 comprises four crankpins 2.
  • Each of the crankpins 2 comprises a first crank- pin part 2a and a second crankpin part 2b. In assembled condition the first and second crankpin parts 2a, 2b are fixed to each other by bolts 3.
  • Fig. 1 shows that the first crankpin part 2a is provided with a tapered recess 4 and the second crankpin part 2b is provided with a tapered protrusion 5.
  • the tapered protrusion 5 fits in the tapered recess 4 of the first crankpin part 2a.
  • the inclination angles of the tapered recess 4 and the tapered protrusion 5 are about 8° with respect to the centre line 6 of the crankpin 2; this angle facilitates loos- ening of the first and second crankpin parts 2a, 2b. Of course, larger or smaller angles are conceivable.
  • the tapered recess 4 is provided at an end portion of the first crankpin part 4, which also forms an end portion of the crankpin 2.
  • the second crankpin part 2b is in fact the tapered protrusion 5 only, in this case.
  • the second crankpin part 2b also has a circumferential portion which is aligned with that of the first crankpin part 2a, such that the circumferential portions of the first and second crankpin parts 2a, 2b are adjacent to each other at a distance of the crank arm 7.
  • Figs. 3-5 show an alternative embodiment of the crankshaft 1 according to the invention.
  • the second crankpin part 2b is provided with a second tapered recess 8 comparable to the tapered recess 4 of the first crankpin part 2a.
  • the tapered protrusion 5 and the second crankpin part 2b are not made of one piece in this case, but the tapered protrusion is part of a fitting member 9 which fits in the second tapered recess 8 of the second crankpin part 2b and is fixed thereto in assembled condition. For this reason a part of the fitting member 9 that fits in the second tapered recess 8 is also tapered.
  • the dimensions of the tapered recess 4 and the second tapered recess 8 are substantially identical, and the fitting member 9 is mir- ror symmetrical in a plane extending perpendicular to a longitudinal centre line of the fitting member 9.
  • Fig. 5 shows the crankshaft 1 in assembled condition. It can be seen that the ends of the first and second crankpin parts 2a, 2b are spaced from each other.
  • the room between the first and second crankpin parts 2a, 2b at the outer surface of the crankpin 2 may be used as an oil channel for lubrication, for example in case of a bearing of a connecting rod pivotally connected to the crankpin 2.
  • the fitting member 9 comprises a through hole which extends parallel to the centre line of the crankpin 2. This allows to insert a bolt into the through hole as illustrated in Fig. 5.
  • the bolt can be fixed in a threaded hole in the crank arm near the first crankpin part 2a of the crankshaft 1, for example.
  • Fig. 4 shows that in the assembled condition the ends of the first and second crankpin parts 2a, 2b are spaced from each other, thereby forming a circular channel, which may be used as an oil channel for lubrication.
  • Manufacturing of the crankshaft 1 can be done on the basis of an intermediary crankshaft made of one piece.
  • the intermediary crankshaft may have an intermediary crank- pin which is longer than the crankpin 2 in its final state.
  • the intermediary crankpin 2 is cut perpendicularly to its longitudinal centre line, which results in the first crankpin part 2a and the second crankpin part 2b.
  • the tapered recess 4 is machined in an end portion of the first crankpin part 2a at the location where the intermediary crankpin was cut.
  • the tapered recess 4 is machined in a direction along its longitudinal centre line.
  • a tapered protrusion 5 is machined.
  • the tapered protrusion 5 projects in a direction along its longitudinal centre line.
  • the tapered recess 4 and tapered protrusion 5 fit to each other.
  • the first crankpin part 2a and the second crankpin part 2b are fixed to each other. This may be performed in several ways, for example by a bolt.
  • the embodiment as shown in Figs. 3-5 can be manufactured in a similar way, but in this case a second tapered recess 8 is machined in an end portion of the second crankpin part 2b.
  • a double tapered fitting member 9 is machined.
  • One side of the double tapered fitting member 9 fits into the tapered recess 4 of the first crankpin part 2a, whereas an opposite side thereof fits into the second tapered recess 8 of the second crankpin part 2b.
  • Fig. 6 illustrates an embodiment of a method of disassembling the crankshaft 1.
  • a disassembling bolt 11 including a bolt disassembling thread 12 is screwed into a mating disassembling thread 13 of the second crankshaft part 2b.
  • An end of the disassembling bolt 11 contacts a portion of the first crankshaft part 2a without being attached thereto upon turning the disassembling bolt 11.
  • the first crankshaft part 2a and the second crankshaft part 2 are pressed in opposite directions .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

La présente invention concerne un vilebrequin (1) qui est doté d’au moins un maneton (2) qui comprend au moins une première partie maneton (2a) et une seconde partie maneton (2b) qui sont fixées l’une à l’autre par des moyens de fixation, la première partie maneton (2a) étant pourvue d’un évidement conique (4) et la seconde partie maneton (2b) étant pourvue d’une saillie conique (5) s’ajustant dans l’évidement conique (4) de la première partie maneton (2a). Le vilebrequin est approprié pour une application dans un moteur à combustion interne.
PCT/EP2008/065051 2008-11-06 2008-11-06 Vilebrequin démontable à pièces multiples WO2010051843A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/065051 WO2010051843A1 (fr) 2008-11-06 2008-11-06 Vilebrequin démontable à pièces multiples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/065051 WO2010051843A1 (fr) 2008-11-06 2008-11-06 Vilebrequin démontable à pièces multiples

Publications (1)

Publication Number Publication Date
WO2010051843A1 true WO2010051843A1 (fr) 2010-05-14

Family

ID=40834557

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/065051 WO2010051843A1 (fr) 2008-11-06 2008-11-06 Vilebrequin démontable à pièces multiples

Country Status (1)

Country Link
WO (1) WO2010051843A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110197705A1 (en) * 2008-11-10 2011-08-18 Beijing Sinocep Engine Technology Co., Ltd. Parts for crankshaft of internal combustion engine or compressor, crankshaft, internal combustion engine and compressor
CN103244548A (zh) * 2013-04-19 2013-08-14 广州万宝集团压缩机有限公司 往复式压缩机的分体曲轴结构
CN103742518A (zh) * 2014-01-29 2014-04-23 广西玉柴机器股份有限公司 内燃机组合式的曲轴
RU2724907C1 (ru) * 2019-08-15 2020-06-26 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный аграрный университет имени И.Т. Трубилина" Устройство составного коленчатого вала

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB157886A (en) * 1920-01-16 1922-03-24 Skf Svenska Kullagerfab Ab Improvements in or relating to built-up crank-shafts
FR690609A (fr) * 1929-05-03 1930-09-24 Perfectionnements relatifs à l'assemblage de deux parties d'arbres
FR858011A (fr) * 1938-08-16 1940-11-15 Arbre-vilebrequin pour moteurs à combustion interne et similaire
US2471982A (en) * 1946-11-04 1949-05-31 Shulda Melvin Splice for crankshaft bearings
US2566785A (en) * 1946-08-16 1951-09-04 Ben W Wheelis Crankshaft construction
DE820347C (de) * 1950-08-22 1951-11-08 Horex Columbus Werk K G Fritz Kurbeltrieb fuer Parallel-Zweizylindermotoren fuer Kraftraeder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB157886A (en) * 1920-01-16 1922-03-24 Skf Svenska Kullagerfab Ab Improvements in or relating to built-up crank-shafts
FR690609A (fr) * 1929-05-03 1930-09-24 Perfectionnements relatifs à l'assemblage de deux parties d'arbres
FR858011A (fr) * 1938-08-16 1940-11-15 Arbre-vilebrequin pour moteurs à combustion interne et similaire
US2566785A (en) * 1946-08-16 1951-09-04 Ben W Wheelis Crankshaft construction
US2471982A (en) * 1946-11-04 1949-05-31 Shulda Melvin Splice for crankshaft bearings
DE820347C (de) * 1950-08-22 1951-11-08 Horex Columbus Werk K G Fritz Kurbeltrieb fuer Parallel-Zweizylindermotoren fuer Kraftraeder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110197705A1 (en) * 2008-11-10 2011-08-18 Beijing Sinocep Engine Technology Co., Ltd. Parts for crankshaft of internal combustion engine or compressor, crankshaft, internal combustion engine and compressor
US9163658B2 (en) * 2008-11-10 2015-10-20 Beijing Sinocep Engine Technology Co., Ltd. Parts for crankshaft of internal combustion engine or compressor, crankshaft, internal combustion engine and compressor
CN103244548A (zh) * 2013-04-19 2013-08-14 广州万宝集团压缩机有限公司 往复式压缩机的分体曲轴结构
CN103742518A (zh) * 2014-01-29 2014-04-23 广西玉柴机器股份有限公司 内燃机组合式的曲轴
RU2724907C1 (ru) * 2019-08-15 2020-06-26 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный аграрный университет имени И.Т. Трубилина" Устройство составного коленчатого вала

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