EP4562321A1 - Ausgleichswelle und verfahren zu deren herstellung - Google Patents
Ausgleichswelle und verfahren zu deren herstellungInfo
- Publication number
- EP4562321A1 EP4562321A1 EP23751253.8A EP23751253A EP4562321A1 EP 4562321 A1 EP4562321 A1 EP 4562321A1 EP 23751253 A EP23751253 A EP 23751253A EP 4562321 A1 EP4562321 A1 EP 4562321A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- bearing ring
- shaft
- pin
- journal
- 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
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
- F16F15/22—Compensation of inertia forces
- F16F15/26—Compensation 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
- F16F15/264—Rotating balancer shafts
- F16F15/267—Rotating balancer shafts characterised by bearing support of balancer shafts; Lubrication arrangements
Definitions
- the invention relates to a balancer shaft and a method for producing it.
- the balance shaft includes:
- Balancing shafts are used to balance mass forces and/or moments in reciprocating internal combustion engines.
- the mass balancing of a four-cylinder in-line engine is carried out by two balancer shafts that rotate in opposite directions at twice the crankshaft speed.
- a generic balancing shaft with an unbalanced shaft and a bearing ring mounted thereon is known from DE 10 2019 101 320 A1.
- Another balancing shaft of the type mentioned at the beginning is currently in series use in reciprocating internal combustion engines from BMW. The different radius dimensions of the inner ring and the bearing journal are implemented on these series parts.
- the present invention is based on the object of considerably simplifying the production of a balance shaft of the type mentioned at the beginning.
- the enveloping circle of the bearing pin should be concentric with the centering holes, with the drive pin being eccentric to the centering holes by the radius difference R - rz and concentric with the bearing ring.
- this geometric design significantly simplifies the machining of the unbalanced shaft into the finished part.
- the drive pin of the finished unbalanced shaft is concentric with its centering holes.
- the axis of rotation of the balance shaft is concentric to the drive journal and the bearing ring and - in order to avoid deformations of the bearing ring due to component tolerances - the inner radius R of the bearing ring resting on the bearing journal is larger than the enveloping circle radius rz of the bearing journal, the radius difference R - rz must be reduced by eccentric machining of the bearing journal Centering holes are compensated.
- this eccentricity cannot be created by a simple turning process between centers in the centering holes. Rather, machining requires a complex milling process or a complex eccentric turning process with correspondingly high investment and/or manufacturing costs.
- the present invention eliminates this disadvantage through the aforementioned eccentricity of the drive pin to the centering holes, so that the machining of the bearing seat is made possible by the comparatively simple and inexpensive turning process of the unbalanced shaft between points in the centering holes.
- the eccentricity of the drive pin to the centering holes can also be done comparatively easily by turning or milling the drive pin using a bell tool.
- Figure 1 shows the balance shaft in a perspective view
- Figure 2 shows the balance shaft in longitudinal section.
- the balance shaft comprises an unbalance shaft 1 finished from a cast or forged blank with an end drive pin 2, two bearing pins 3 and 4 and unbalance sections 5, 6 and 7.
- the drive pin 2 takes a deep groove ball bearing (not shown) which supports the balance shaft axially in the internal combustion engine. and a gear (also not shown) driving the balance shaft.
- the bearing journals 3, 4 only have a partially cylindrical circumference, with the cylindrical partial circumference 8 being oriented in the direction of the shaft unbalance u (see arrow in Figure 2), which is caused by the mass gravity which is eccentric to the operational axis of rotation 9 of the balancing shaft. points of both the unbalance sections 5, 6, 7 and the bearing journals 3, 4 are generated.
- the unbalanced shaft 1 is radially supported in the internal combustion engine by means of needle bearings 10, the inner raceways 11 of which are each formed by a bearing ring 12 surrounding the bearing journal 3, 4.
- the bearing rings 12 are also axially fastened to the unbalanced shaft 1 by means of the sheet metal springs 14, which are each axially positively connected to the bearing pin back 13 on the one hand and to the bearing ring 12 on the other.
- the bearing rings 12 each rest with an inner radius R on the cylindrical partial circumference 8 of the bearing journals 3, 4. A deformation of the exactly cylindrical inner race 11 of each bearing ring 12 is prevented in view of unavoidable component tolerances in that the inner radius R of the bearing ring 12 is larger than the enveloping circle radius rz of the respective bearing journal 3, 4.
- Figure 2 illustrates the geometric relationships on the dimensioned bearing pin 4, on which the enveloping circle C lying on the cylindrical partial circumference 8 is shown rotated by 90 °.
- the enveloping circle C is concentric with a machining axis 15, which in turn is concentric with centering holes 16 and 17, which are machined into the end faces of the unbalance shaft 1.
- the machining of each cylindrical partial circumference 8 is carried out by a simple turning process, namely by holding the unbalanced shaft 1 on tips in the centering bores 16, 17, so that the origin of the enveloping circle radius rz lies on the machining axis 15.
- the operational axis of rotation 9 of the balance shaft is concentric with the bearing rings 12 and the drive pin 2 and eccentric to the machining axis 15 by the radius difference R - rz.
- the final machining of the drive pin 2 is carried out using a bell tool, which moves eccentrically to the centering bores 16, 17 by the radius difference R - rz.
Landscapes
- 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
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022118782.9A DE102022118782B4 (de) | 2022-07-27 | 2022-07-27 | Ausgleichswelle und Verfahren zu deren Herstellung |
| PCT/DE2023/100550 WO2024022559A1 (de) | 2022-07-27 | 2023-07-26 | Ausgleichswelle und verfahren zu deren herstellung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4562321A1 true EP4562321A1 (de) | 2025-06-04 |
Family
ID=87557678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23751253.8A Pending EP4562321A1 (de) | 2022-07-27 | 2023-07-26 | Ausgleichswelle und verfahren zu deren herstellung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4562321A1 (de) |
| CN (1) | CN119343546A (de) |
| DE (1) | DE102022118782B4 (de) |
| WO (1) | WO2024022559A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19807180A1 (de) | 1998-02-20 | 1999-08-26 | Bayerische Motoren Werke Ag | Vorrichtung zum Massenausgleich an einer Hubkolben-Brennkraftmaschine |
| DE102010034289A1 (de) * | 2010-08-13 | 2012-02-16 | Schaeffler Technologies Gmbh & Co. Kg | Unwuchtwelle und Verfahren zu deren Herstellung |
| DE102019101320A1 (de) | 2018-08-30 | 2020-03-05 | Schaeffler Technologies AG & Co. KG | Ausgleichswelle |
-
2022
- 2022-07-27 DE DE102022118782.9A patent/DE102022118782B4/de active Active
-
2023
- 2023-07-26 EP EP23751253.8A patent/EP4562321A1/de active Pending
- 2023-07-26 CN CN202380045724.5A patent/CN119343546A/zh active Pending
- 2023-07-26 WO PCT/DE2023/100550 patent/WO2024022559A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022118782B4 (de) | 2024-11-28 |
| WO2024022559A1 (de) | 2024-02-01 |
| CN119343546A (zh) | 2025-01-21 |
| DE102022118782A1 (de) | 2024-02-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
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| AK | Designated contracting states |
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