WO2016030569A1 - Système permettant de réduire une usure de contact dans un assemblage boulonné (en particulier pour une structure de contrepoids de vilebrequin) - Google Patents

Système permettant de réduire une usure de contact dans un assemblage boulonné (en particulier pour une structure de contrepoids de vilebrequin) Download PDF

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Publication number
WO2016030569A1
WO2016030569A1 PCT/FI2014/050660 FI2014050660W WO2016030569A1 WO 2016030569 A1 WO2016030569 A1 WO 2016030569A1 FI 2014050660 W FI2014050660 W FI 2014050660W WO 2016030569 A1 WO2016030569 A1 WO 2016030569A1
Authority
WO
WIPO (PCT)
Prior art keywords
counterweight
crankshaft
bolt
protrusion
bolt hole
Prior art date
Application number
PCT/FI2014/050660
Other languages
English (en)
Inventor
Teemu KUIVANIEMI
Original Assignee
Wärtsilä Finland Oy
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 Wärtsilä Finland Oy filed Critical Wärtsilä Finland Oy
Priority to PCT/FI2014/050660 priority Critical patent/WO2016030569A1/fr
Publication of WO2016030569A1 publication Critical patent/WO2016030569A1/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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
    • F16F15/283—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same for engine crankshafts

Definitions

  • the present invention relates to a system of to each other joinable two parts, especially a crankshaft - counterweight system for piston engines. Especially the invention relates to a system of two to each other joinable two parts as defined in the preamble of independent system claim.
  • Fretting refers to wear damage that is caused when two surfaces move in relation to each other with very small amplitudes.
  • a typical cause of fretting is vibration under load.
  • Fretting is a common problem in machines, where moving parts cause vibrations.
  • a typical example of such machines is a piston engine, where movement of the pistons and pressure variations in the cylinders cause movements of the contact surfaces between various parts.
  • Joints where the contact pressure is uneven are more susceptible to fretting. At the areas of low contact pressure, the contact surfaces of the joint slide more easily in relation to each other, and this causes fretting.
  • Bolt joints are a typical example of joints with uneven contact pressure. The tension of a bolt causes deformation of the clamped parts around the bolt holes.
  • each counterweight is typically attached to the crankshaft with two stud bolts.
  • the crankshaft is provided with threaded blind holes for the stud bolts and each counterweight is provided with corresponding through holes.
  • One end of each stud bolt is inserted into a hole of the crankshaft and engaged with the internal thread of the hole.
  • the stud bolts are then arranged into the bolt holes of the counterweight and a nut is tightened around the second end of each stud bolt.
  • bolt joints are the joints between the engine block and brackets for different parts to be joined to the engine, such as pumps, turbo chargers etc.
  • Fretting damage is one problem relating to crankshafts of piston engines.
  • Main reason for the fretting damage is too low contact pressure on contact surface between crankshaft and counter weights, which cannot resist the high shear stresses caused by counter weight vibrations.
  • Globally contact pressure is enough to resist shear forces but contact pressure and shear stresses are not evenly distributed to whole contact surface and there are areas on the contact surface where contact pressure is very low but shear stress amplitude can be high.
  • An object of the present invention is to provide a system of to each other join- able parts, in which the problems described above, in particular relating to fretting, are eliminated or at least minimized.
  • One particular object of the invention is to create a crankshaft-counterweight system with an improved crankshaft - counterweight contact surface.
  • One particular object of the invention is to create a part-part system with an improved contact surface.
  • the system of to each other joinable two parts which parts are opposed to each other and joined to each other by at least one bolt joint comprising a bolt located through respective bolt hole such that part- part contact surface is formed, characterized in that on at least surface of one of the parts is formed at least one circular protrusion extending at least partially around the joint and that the at least one circular protrusion forms contact area of the part-part contact surface.
  • each protrusion on one part is towards the opposed part and upwards from the surface of the one part.
  • the protrusion is formed as two protrusions, which are located spaced apart around the bolt hole.
  • the protrusion is formed as one protru- sion circumventing bolt hole.
  • the contact area of the part-part contact surface formed by the protrusion/-s is defined based on the tightening force of the bolts.
  • edges of the protrusion are inclined. According to an advantageous feature corners of the protrusion are rounded.
  • the system is a crankshaft - counterweight system comprising a crankshaft and a counterweight, which are attached to each other by bolt joints, which comprise bolts located through bolt holes in the counterweight to threaded holes in the crankshaft so that a crankshaft - counterweight contact surface is formed, and on surface of the counterweight has been formed at least one, preferably two circular protrusion/ ⁇ , which are formed as at least two circular segments around each bolt hole of the crankshaft.
  • at least one of the protrusions is located between the longitudinal end of the counterweight and the bolt hole and at least one other of the protrusions is located on opposed side of the bolt hole in respect to the other protrusion.
  • crankshaft - counterweight system comprises according to an advantageous aspect a crankshaft - counterweight contact surface, wherein shape of the con- tact surface is two segments around the bolt holes of the bolt joint of the crankshaft - counterweight system, wherein the area, which is below the fillet of the main journal, is contactless, wherein the area close to the bolt holes is contactless and wherein the corners of the contact surface have rounded shape.
  • Main journal fillet degreases the stiffness at the corner of the contact surface. This is a contact area where fretting damage is very likely to occur due to low contact pressure. Threads close to contact surface causes contact pressure concentration around the bolt holes.
  • figure 1 is show schematically a simplified example of a crankshaft - counterweight contact surface according to prior art
  • figure 2 is shown schematically a simplified example of locations of bolt holes on a crankshaft - counterweight contact surface according to an advantageous feature of the invention
  • figure 3 is shown schematically a simplified example of a crankshaft - counterweight contact surface according to the invention
  • figures 4A - 4C is shown schematically a simplified example of a part- part contact surface according to the invention.
  • FIG 1 shows schematically a simplified example of a crankshaft - counterweight contact surface 12 (squared area) according to prior art on the coun- terweight 10 side.
  • Each bolt hole 1 1 is located substantially centrally on the contact area.
  • the contact area 12 is located around the corresponding bolt hole 1 1 extending to substantially whole area of the counterweight surface in cross direction and in longitudinal direction such that a square like surface is formed, when the area of the recess 13.
  • Figure 2 shows schematically a simplified example of locations of bolt holes 21 on a crankshaft - counterweight contact surface 12 according to an advantageous feature. In figure 2 with dashed lines are indicated the locations of bolt holes 1 1 according to prior art. The location of the bolt hole 21 is moved slightly towards the center of the counterweight 10 in longitudinal direction and slightly away from the recess 23.
  • FIG 3 shows schematically a simplified example of a crankshaft - counterweight contact surface according to the invention.
  • protrusions 22A; 22B are formed as two segments around the bolt holes 21 .
  • the contact pressure is more evenly distributed over the whole contact surface.
  • the low contact pressure areas 31 at each end of the recess 23 are contactless and thus there is not contact in area which is below the fillet of the main journal, which were contact areas where fretting damage would very likely occur due to low contact pressure.
  • the contact pressure is more evenly distributed to whole contact surface, as threads close to contact surface would cause contact pressure concentration around the bolt holes 21 .
  • the protrusions 22A; 22B have rounded shape in the corners. Typically highest shear stresses due to counter weight vibrations occur in the corners of contact surfaces. With the rounded shape shear stress is more evenly distributed to whole contact area.
  • each contact surface is towards the crankshaft protruding circular segment with rounded corners and inclined edges.
  • FIGS 4A - 4C is schematically shown a simplified example of a part- part (10, 12) contact surface according to the invention.
  • protrusions 22 are formed circularly on at least one 10 of the parts around the bolt hole 21 of the joint of the parts 10, 12.
  • the contact pressure is evenly distributed over the whole contact surface.
  • the protrusions 22 have rounded shape in the corners and inclined edges.
  • the system has been described above by referring to a joint of a crankshaft and a counterweight, it can be used in many other applications as well such as bolt joints between the engine block and brackets for different parts to be joined to the engine, such as pumps, turbo chargers etc. Basically, the system can be applied to any two part system, where fretting phenomenon can occur.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

La présente invention concerne un système de deux pièces (10, 12) pouvant être assemblées l'une avec l'autre, lesdites pièces (10, 12) étant opposées l'une par rapport à l'autre et assemblées l'une avec l'autre par au moins un assemblage boulonné comprenant un boulon situé dans un trou de boulon respectif, de sorte qu'une surface de contact pièce-pièce soit formée. Sur au moins une surface de l'une (10) des pièces (10, 12), est formée au moins une saillie circulaire (22 ; 22A, 22B) qui s'étend au moins partiellement autour de l'assemblage, la ou les saillies circulaires formant une zone de contact de la surface de contact pièce-pièce.
PCT/FI2014/050660 2014-08-29 2014-08-29 Système permettant de réduire une usure de contact dans un assemblage boulonné (en particulier pour une structure de contrepoids de vilebrequin) WO2016030569A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2014/050660 WO2016030569A1 (fr) 2014-08-29 2014-08-29 Système permettant de réduire une usure de contact dans un assemblage boulonné (en particulier pour une structure de contrepoids de vilebrequin)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2014/050660 WO2016030569A1 (fr) 2014-08-29 2014-08-29 Système permettant de réduire une usure de contact dans un assemblage boulonné (en particulier pour une structure de contrepoids de vilebrequin)

Publications (1)

Publication Number Publication Date
WO2016030569A1 true WO2016030569A1 (fr) 2016-03-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2014/050660 WO2016030569A1 (fr) 2014-08-29 2014-08-29 Système permettant de réduire une usure de contact dans un assemblage boulonné (en particulier pour une structure de contrepoids de vilebrequin)

Country Status (1)

Country Link
WO (1) WO2016030569A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT520205B1 (de) * 2017-09-15 2019-02-15 Miba Sinter Austria Gmbh Lagerdeckel
DE102017119058A1 (de) * 2017-08-21 2019-02-21 Schunk Sintermetalltechnik Gmbh Lagerdeckel sowie Lageranordnung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1111877B (de) 1958-01-22 1961-07-27 Zentrale Entwicklung Veb Vorrichtung zur Daempfung von Dreh- und Biegeschwingungen an Kurbelwellen mit an der Kurbelwelle bzw. der Wange nachgiebig befestigtem Gegengewicht
DE1273900B (de) 1959-10-31 1968-07-25 Daimler Benz Ag Loesbare Gegengewichtsbefestigung an der Kurbelwelle von Brennkraftkolbenmaschinen
DE3738717A1 (de) 1986-11-28 1988-07-28 Volkswagen Ag Gebaute kurbelwelle
WO1997042424A1 (fr) * 1996-05-03 1997-11-13 Zenith Sintered Products, Inc. Chapeau de palier pouvant etre repositionne avec precision
US6471406B1 (en) * 1996-05-03 2002-10-29 Gkn Sinter Metals, Inc. Side-bolt bearing caps
JP2014005859A (ja) * 2012-06-22 2014-01-16 Ihi Corp 結合構造体

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1111877B (de) 1958-01-22 1961-07-27 Zentrale Entwicklung Veb Vorrichtung zur Daempfung von Dreh- und Biegeschwingungen an Kurbelwellen mit an der Kurbelwelle bzw. der Wange nachgiebig befestigtem Gegengewicht
DE1273900B (de) 1959-10-31 1968-07-25 Daimler Benz Ag Loesbare Gegengewichtsbefestigung an der Kurbelwelle von Brennkraftkolbenmaschinen
DE3738717A1 (de) 1986-11-28 1988-07-28 Volkswagen Ag Gebaute kurbelwelle
WO1997042424A1 (fr) * 1996-05-03 1997-11-13 Zenith Sintered Products, Inc. Chapeau de palier pouvant etre repositionne avec precision
US6471406B1 (en) * 1996-05-03 2002-10-29 Gkn Sinter Metals, Inc. Side-bolt bearing caps
JP2014005859A (ja) * 2012-06-22 2014-01-16 Ihi Corp 結合構造体

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017119058A1 (de) * 2017-08-21 2019-02-21 Schunk Sintermetalltechnik Gmbh Lagerdeckel sowie Lageranordnung
AT520205B1 (de) * 2017-09-15 2019-02-15 Miba Sinter Austria Gmbh Lagerdeckel
AT520205A4 (de) * 2017-09-15 2019-02-15 Miba Sinter Austria Gmbh Lagerdeckel
US10400816B2 (en) 2017-09-15 2019-09-03 Miba Sinter Austria Gmbh Bearing cover

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