DE19723378A1 - Counterbalancing shaft for piston engine - Google Patents

Counterbalancing shaft for piston engine

Info

Publication number
DE19723378A1
DE19723378A1 DE1997123378 DE19723378A DE19723378A1 DE 19723378 A1 DE19723378 A1 DE 19723378A1 DE 1997123378 DE1997123378 DE 1997123378 DE 19723378 A DE19723378 A DE 19723378A DE 19723378 A1 DE19723378 A1 DE 19723378A1
Authority
DE
Germany
Prior art keywords
shaft
balance
drive wheel
basic
characterized
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Withdrawn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
DE1997123378
Other languages
German (de)
Inventor
Michael Kaempfner
Karsten Tremper
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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
Priority to DE19623532 priority Critical
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE1997123378 priority patent/DE19723378A1/en
Publication of DE19723378A1 publication Critical patent/DE19723378A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/22Compensation of inertia forces
    • F16F15/26Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system
    • F16F15/264Rotating balancer shafts
    • F16F15/268Hollow shafts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/22Compensation of inertia forces
    • F16F15/26Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system
    • F16F15/264Rotating balancer shafts

Abstract

The shaft (1) has one or more weights (4), two surfaces (6,7) spaced apart and by which it works in bearings and a driving wheel (5). One weight at least is detachable from a portion (2) of the shaft and to which the wheel is positively secured. It is held in place by a component (14) passing through it in the radial direction and extending into the shaft.The coupling between the latter and the wheel can be by mating flats, and the wheel can be secured in the axial direction between the detachable weight and a flange (20) on the shaft.

Description

The invention relates to a balance shaft for a reciprocating piston internal combustion engine at least one balance weight according to the preamble of claim 1.

EP 0 075 659 A2 describes a balancing shaft of the generic type for an internal combustion engine known with a so-called Lancaster compensation. Is on this balance shaft at the end a drive wheel is floating, while starting from there in the distance ren axial extent two spaced-apart bearing surfaces to the rota toric support in bearings located on the surface of this balancer shaft. On both sides of the bearing surface located away from the drive wheel are two off Equilibrium weights rigidly attached to the shaft.

The bearing surface assigned to the counterweights is part of a pure radial bearing, while at the opposite end on either side of the storage area there a collar is formed on the balance shaft for axial bearing.

In this known balancer shaft there is relatively great freedom of movement with regard to Design of the balance shaft, as this is in a separate, outside on a crank Housing of the internal combustion engine flange-mounted bearing housing is arranged.

Detachable attachments of counterweights to crankshafts, for example known from DE-AS 12 73 900, DE 37 38 717 A1 or EP 0 402 607. From the aforementioned DE 37 38 717 A1 it is, for example, for a built crankshaft known, separately by means of tie rod bolts supported on crank pins formed crank webs between this crank pin and one on the opposite to brace the side of the crank pin arranged counterweight.

The invention has for its object a generic balancer shaft for a To create reciprocating internal combustion engine, which in particular with regard to their overall length is minimized in the installation space and deformations in the bearing area due to the centrifugal force effect largely avoided by the counterweights.  

This object is achieved with the features of patent claim 1. Advantageous embodiments of the invention are in the dependent claims specified.

The invention provides a detachable arrangement of at least one balance weight a fundamental wave of the balance shaft and a positive connection between the the balance shaft driving drive wheel and this basic shaft. The compensation Weight is in this case radially by a connecting element of the detachable arrangement sets, which extends into the positive connection part of the fundamental wave. With the detachable arrangement of the at least one balance weight, this is the advance created for the fundamental wave with its bearing surfaces in corresponding Bearing of a housing of the reciprocating internal combustion engine without problems and without collisions can be inserted. Then this can have a maximum balancing effect optimized balance weight by means of the connecting element on the basic shaft be attached. The radial pushing through of the balance weight through the connector tion element ensures an optimal loading of this connecting element in Direction of centrifugal forces occurring during rotation.

Characterized in that the said connecting element in the positive connection part of the fundamental wave, the balance weight is fixed on the fundamental wave and secured against twisting.

The positive connection between the drive wheel and the basic shaft, whereby due to the extension of the connecting element in the fundamental wave form conclusive connecting part this connection must be flat, offers the Advantage of a safe and torque-correct transmission of the to the drive wheel forces acting on the fundamental wave.

Problems such as those encountered in particular in inline engines with low cylinders number due to the uneven rotation of the balance shaft by the crankshaft when using z. B. inserted keys for torque transmission can be avoided.

In an advantageous embodiment of the invention it can further be provided that one end of the fundamental wave is attached to a sleeve, which is between the compensating ge weight and the fundamental wave is clamped by means of the connecting element. The drive wheel is preferably in one piece and of the same material with this sleeve formed, wherein the drive wheel is axially secured by being between a collar of Fundamental wave and the balance weight is fixed.  

This covenant of the fundamental wave arises as a result of being on the fundamental wave as part of the form conclusive connection trained flattening.

As a result, an arrangement which is optimal in terms of installation space, in particular in terms of the installation length, is reduced created by the drive wheel and balance weight on the balance shaft.

In a further advantageous embodiment, a radial and axial bearing of the balance shaft between a hub of the drive wheel and another, attached to the basic shaft formed covenant.

The sequence of off starting from one end of the balancer shaft Equilibrium weight, drive wheel and bearing surface ensure a load-bearing capacity Stress concentration through the centrifugal force of the balance weight in one favorable cross-section of the fundamental wave and a favorable inclusion of the drive radial forces introduced into the adjacent bearing. Because of this close cooperation back of the drive wheel and bearings are largely deformations in the bearing area avoided.

Further advantages of the invention result from the following with the aid of a drawing embodiment explained in more detail.

Show it:

Fig. 1 shows a cross section through a balance shaft,

Fig. 2 is a plan view of a balance shaft,

Fig. 3 is a view from the direction of arrow X according to Fig. 2 and

Fig. 4 is a perspective view of a balance shaft.

A generally designated 1 balancer shaft to compensate for oscillating Mas senmomenten of a reciprocating piston internal combustion engine, not shown, consists Wesent union of a base shaft 2, a rigidly mounted thereon counterweight 3, a releasably attached to the base shaft 2 balance weight 4 and a drive wheel. 5 The basic shaft 2 has two axially spaced bearing surfaces 6 and 7 for rotational support of the balancer shaft 1 in bearings of the reciprocating piston internal combustion engine, not shown.

The drive wheel 5 is rotatably arranged in the course of a flattening 8 with mutually facing positive locking surfaces 9 and 10 of the drive wheel 5 and the basic shaft 2 .

The adjusting is due to the flattening 8 positive connection part 11 of the base shaft 2 has a thread 12 for receiving a fitting screw 13 formed as connecting element fourteenth

The drive wheel 5 has a hub 15 and is formed in one piece and of the same material with a sleeve 16 which carries the form-fitting surface 9 on its inner circumference.

The releasable balance weight 4 is fixed by means of the fitting screw 13 with the interposition of the sleeve 16 on the basic shaft 2 . The dowel screw 13 radially passes through a recess 17 of the balance weight 4 , an opening 18 in the sleeve 16 and provides an exact axial position assignment from the drive wheel 5 to the basic shaft 2 and from the balance weight 4 to the drive wheel 5 via a collar 19 .

A collar 20 extends radially between the form-fitting surface 10 of the flat 8 and the bearing surface 6 , the hub 15 being secured axially between the counterweight 4 and this collar 20 .

On the side of the drive wheel 5 facing away from the counterweight 4, the hub 15 encircles the bearing surface 6 in a circular manner and forms an axial bearing of the counterbalance shaft 1 with a thrust surface 21 and a further collar 22 formed on the basic shaft.

At the end, an end plane E extends transversely to the longitudinal axis L of the balance shaft 1 , in which an end face 23 of the basic shaft 2 , an end face 24 of the sleeve 16 and an end face 25 of the releasable balance weight 4 are arranged.

Adjacent to the further bearing surface 7 , the basic shaft 2 carries the other balance weight 3 in one piece and material uniformly. The basic shaft 2 is hollow drilled along the longitudinal axis L by means of a bore 26 for lightening the weight.

The above-described arrangement of the releasable balance weight 4 with the interposition of the drive wheel 5 via the flattening 8 on the basic shaft 2 represents an extremely compact arrangement of these required components, in particular with respect to the longitudinal extension in the direction of the longitudinal axis L.

When installing the balancer shaft 1 , the one-piece basic shaft 2 with its bearing surfaces 6 and 7 can first be inserted into corresponding bearings until the collar 22 comes into contact. Then the drive wheel 5 can be joined by hand. After mounting the counterweight 4 and the tightening of the fitting screw 13 in the operation of these balance shaft 1 are introduced, the centrifugal forces caused by the balance weight 4 stressable on the dowel screw 13 and the thread 12 in the fundamental wave. 2

The closely adjacent to the bearing surface 6 drive via the drive wheel 5 gently minimizes bending loads at this bearing point.

The drive power for the balancer shaft 1 introduced via the drive wheel 5 is transmitted over the comparatively large interlocking surfaces 9 and 10 in accordance with the stress and pressure, while avoiding any notches. Since there is no notch effect as a result, the material used for the fundamental wave 2 can accordingly be selected inexpensively, for example as spheroidal cast iron GGG-50.

The drive wheel 5 is designed with a hub 15 and a sleeve 16 as a sintered part, since this enables the necessary tolerances to be provided inexpensively and simply.

The positive connection between the drive wheel 5 and the basic shaft 1 can also take place over a plurality of flats 8 .

Claims (7)

1. balance shaft ( 1 ) for a reciprocating internal combustion engine, with
  • - at least one counterweight ( 4 ),
  • - Two spaced-apart bearing surfaces ( 6 , 7 ) for rotational support in bearings and
  • - a drive wheel ( 5 ),
    marked by
  • - A detachable arrangement of at least one balance weight ( 4 ) on a base shaft ( 2 ) of the balance shaft ( 1 ),
  • - A positive connection between the drive wheel ( 5 ) and the basic shaft ( 2 ),
  • - The detachable arrangement has a connecting element ( 14 ) which passes through the counterweight ( 4 ) radially and extends into the form-fitting connec tion part ( 11 ) of the basic shaft ( 2 ).
2. Balance shaft according to claim 1, characterized in that
  • - The positive connection is formed by at least one flattening ( 8 ) with mutually facing positive locking surfaces ( 9 , 10 ) of the drive wheel ( 5 ) and the basic shaft ( 2 ),
  • - That the drive wheel ( 5 ) on the basic shaft ( 2 ) between the releasable counterweight ( 4 ) and a collar ( 20 ) of the basic shaft ( 2 ) is arranged axially secured.
3. balance shaft according to claim 2, characterized in that the collar ( 20 ) extends radially between the fundamental shaft-side positive locking surface ( 10 ) and the bearing surface ( 6 ) and a hub ( 15 ) of the drive wheel ( 5 ) this bearing surface ( 6 ) circular, forming an axial bearing with a further collar ( 22 ) of the fundamental shaft ( 2 ).
4. Balance shaft according to one of claims 1 to 3, characterized in that the balance weight ( 4 ) with the interposition of a on the positive connec tion part ( 11 ) arranged sleeve ( 16 ) on the basic shaft ( 2 ) is arranged.
5. balance shaft according to claim 4, characterized in that the sleeve ( 16 ) and the drive wheel ( 5 ) are integrally formed and of the same material.
6. Balance shaft according to claim 5, characterized in that the Verbindungsele element ( 14 ) is designed as a fitting screw ( 13 ) which passes through the balance weight ( 4 ) and the sleeve ( 16 ) and into a thread ( 12 ) of the basic shaft ( 2 ) engages, a fitting collar ( 19 ) in the screwed-in state extending from the counterweight ( 4 ) into the basic shaft ( 2 ).
7. balance shaft according to claim 6, characterized in that end faces ( 23 and 24 and 25 ) of the basic shaft ( 2 ) and the sleeve ( 16 ) and the releasable balance weight ( 4 ) in an end, transverse to the longitudinal axis (L) of the balance shaft ( 1 ) extending end plane (E) are arranged horizontally.
DE1997123378 1996-06-13 1997-06-04 Counterbalancing shaft for piston engine Withdrawn DE19723378A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19623532 1996-06-13
DE1997123378 DE19723378A1 (en) 1996-06-13 1997-06-04 Counterbalancing shaft for piston engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997123378 DE19723378A1 (en) 1996-06-13 1997-06-04 Counterbalancing shaft for piston engine

Publications (1)

Publication Number Publication Date
DE19723378A1 true DE19723378A1 (en) 1998-01-02

Family

ID=7796806

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1997123378 Withdrawn DE19723378A1 (en) 1996-06-13 1997-06-04 Counterbalancing shaft for piston engine

Country Status (1)

Country Link
DE (1) DE19723378A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207459A1 (en) * 2002-01-22 2003-07-24 Opel Adam Ag - Mass balance shaft made in sections with weight zones for automotive piston engine
DE10320747A1 (en) * 2003-05-09 2004-12-09 Daimlerchrysler Ag Balance shaft for an internal combustion engine and a method for producing the same
DE10322308B4 (en) * 2003-05-17 2006-03-02 Daimlerchrysler Ag Balancer shaft bearings
WO2007003217A1 (en) * 2005-07-05 2007-01-11 Fites A 4-stroke, mono-cylinder, liquid-cooled, internal combustion engine, in particular for motorcycles or quads
DE102008003807A1 (en) * 2008-01-10 2009-07-16 Magna Powertrain Ag & Co Kg Mass balancing unit for balancing mass force or momentum with internal combustion engine in motor vehicle, has rotary gearwheel, rotary imbalances and bolt
WO2012013339A1 (en) * 2010-07-28 2012-02-02 Gkn Sinter Metals Holding Gmbh Arrangement of a balance weight on a balance shaft

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207459A1 (en) * 2002-01-22 2003-07-24 Opel Adam Ag - Mass balance shaft made in sections with weight zones for automotive piston engine
DE10320747A1 (en) * 2003-05-09 2004-12-09 Daimlerchrysler Ag Balance shaft for an internal combustion engine and a method for producing the same
DE10320747B4 (en) * 2003-05-09 2007-02-01 Daimlerchrysler Ag Balance shaft for an internal combustion engine and a method for producing the same
US7533646B2 (en) 2003-05-09 2009-05-19 Daimler Ag Balancing shaft for an internal combustion engine and a method for the production thereof
DE10322308B4 (en) * 2003-05-17 2006-03-02 Daimlerchrysler Ag Balancer shaft bearings
WO2007003217A1 (en) * 2005-07-05 2007-01-11 Fites A 4-stroke, mono-cylinder, liquid-cooled, internal combustion engine, in particular for motorcycles or quads
DE102008003807A1 (en) * 2008-01-10 2009-07-16 Magna Powertrain Ag & Co Kg Mass balancing unit for balancing mass force or momentum with internal combustion engine in motor vehicle, has rotary gearwheel, rotary imbalances and bolt
WO2012013339A1 (en) * 2010-07-28 2012-02-02 Gkn Sinter Metals Holding Gmbh Arrangement of a balance weight on a balance shaft

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