EP1064120B2 - Method for machining plane surfaces of a disk brake for motor vehicles - Google Patents

Method for machining plane surfaces of a disk brake for motor vehicles Download PDF

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Publication number
EP1064120B2
EP1064120B2 EP00906212A EP00906212A EP1064120B2 EP 1064120 B2 EP1064120 B2 EP 1064120B2 EP 00906212 A EP00906212 A EP 00906212A EP 00906212 A EP00906212 A EP 00906212A EP 1064120 B2 EP1064120 B2 EP 1064120B2
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EP
European Patent Office
Prior art keywords
wheel hub
wheel
machined
rotation
machining
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EP00906212A
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German (de)
French (fr)
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EP1064120B1 (en
EP1064120A1 (en
Inventor
Manfred G. Becker
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Ernst Thielenhaus GmbH and Co KG
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Ernst Thielenhaus GmbH and Co KG
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Priority claimed from US09/233,595 external-priority patent/US6071180A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies

Definitions

  • the invention relates to a method for machining flat surfaces of a disc brake consisting of wheel bearing unit and brake disc for motor vehicles.
  • the wheel bearing unit comprises a wheel hub, a roller bearing assembly and an outer bearing ring having a mounting surface for attachment to the vehicle.
  • the wheel hub has a flange surface for mounting the brake disc.
  • the brake disc rotating with the hub carries out wobbling movements or rotational angle-dependent offset movements in the axial direction, which are also referred to as impact. Even slight angle-dependent offset movements or wobbling movements are noticeable as vibrations that are transmitted to the brake pedal during a braking operation. Machining errors on the flange surface of the wheel hub are more noticeable, the larger the brake disc is. The effect described therefore occurs especially in vans, pickups, trucks and similar commercial vehicles.
  • the surfaces of the wheel hub are finished before the wheel hub is mounted together with the rolling bearing assembly and the bearing ring to a wheel bearing unit.
  • a disturbing shock during a rotational movement of the wheel hub is regularly detected on the flange surface for the brake disc.
  • the rotational angle-dependent offset movement is often in the order of 40 to 60 microns after measurements on hubs of commercial vehicles. As the diameter increases, the impact increases.
  • On the outer diameter of the brake disk rotation angle-dependent displacement movements occur in the axial direction of up to 100 microns, which are transmitted to the brake pedal as a disturbing vibrations upon actuation of the brake.
  • the invention has for its object to perform the machining so that the measurable blow on the disc of a built-in vehicle disc brake blow is negligible.
  • the object of the invention and solution to this problem is a method for processing flat surfaces of a disc brake for motor vehicles according to claim 1.
  • the outer bearing ring and the hub are not finished as individual parts, but the processing takes place on the preassembled wheel bearing unit.
  • either the flange surface of the wheel hub or the braking surfaces of the previously mounted brake disc are processed.
  • the wheel hub of the wheel bearing unit always serves as a spindle, so that the same conditions prevail as in the later installed state on the vehicle.
  • the invention is based on the consideration that the initially described disturbing angle-dependent offset movements, ie the impact, can be almost eliminated in this way, since aligned after machining the mounting surface of the outer bearing ring and the flange of the wheel hub and the braking surfaces of the brake disc exactly plane-parallel are.
  • the required plane parallelism between the mounting surface and braking surfaces of the brake disc is ensured when the wheel bearing unit is clamped with the mounting surface of the outer bearing ring on a workpiece carrier and the assembly is machined with a grinding tool, the grinding surface is aligned parallel to the workpiece carrier.
  • machining operations eg. B. turning, milling u. like.
  • the braking surfaces of the brake disc are processed, the brake disc is biased with a Anyakschreibe and clamping screws against the hubs and tighten the clamping screws with a defined bias corresponding to the subsequent use on the motor vehicle before the braking surfaces are processed.
  • the surface to be machined is scanned with a sensor and angular displacement movements are measured in the axial direction. As soon as the measured values of the sensor remain within a permissible tolerance range, processing is stopped.
  • the wheel hub can be driven by the spindle of a machine tool, which surrounds the preferably ring-shaped workpiece carrier and is coupled with the interposition of a flexible adapter element to the wheel hub. Due to the flexible adapter element, any slight eccentricity between the clamped on the workpiece carrier to be machined assembly and the axis of rotation of the spindle can be compensated.
  • Another embodiment of the method according to the invention provides that the wheel hub is driven by a spindle, the above to be machined Assembly is coupled. It is expedient for axial bearing bearings to apply an axial preload to eliminate axial play of the rolling bearing arrangements on the wheel bearing unit during machining.
  • the workpiece carrier is arranged stationary or can be fed on a transport device to a processing station.
  • the wheel bearing unit to be machined or consisting of wheel bearing unit and mounted brake disc assembly is clamped to a workpiece carriers of a turntable and brought by a rotary movement of the turntable in the working area of a processing machine, which can be coupled to the assembly spindle for the rotary drive of the wheel hub and at least one rotating having drivable machining tool.
  • the processing station can be designed, for example, as a double-side grinding machine for double-sided machining of the brake disc.
  • the inventive method is suitable for finishing planar surfaces of a disc brake for motor vehicles, in which the surfaces to be machined are ground flat with a rotating grinding wheel.
  • a grinding wheel for example, a cup wheel can be used, whose axis of rotation is offset parallel to the axis of rotation of the wheel hub.
  • the flange surface 1 of a wheel hub 2 is machined on a wheel bearing unit for motor vehicles.
  • the flange surface 1 to be machined is a connection surface for a brake disk.
  • the wheel hub 2 Before the surface grinding, the wheel hub 2 is mounted with a rolling bearing assembly 3 and an outer bearing ring 4 to a wheel bearing unit.
  • the outer bearing ring has a mounting surface 5 for attachment to the vehicle.
  • the wheel bearing unit is clamped to the mounting surface 5 of the outer bearing ring 4 on a stationary workpiece carrier 6.
  • the workpiece carrier 6 is designed as a precision machined ring and positioned on the machine bed 7 of a machine tool.
  • the outer bearing ring 4 of the wheel bearing unit is fixed on the workpiece carrier.
  • the wheel hub 2 is driven in rotation by a spindle 9 of the machine tool.
  • the spindle 9 passes through the annular workpiece carrier 6 and is coupled with the interposition of a flexible adapter element 10 to the wheel hub 2.
  • a cup wheel 11 is used, which is connected to a drive, not shown.
  • the cup wheel 11 rotates and performs indicated by directional arrows axial feed movements.
  • the flange 1 of the rotating hub 2 is scanned with a sensor 12.
  • a sensor 12 By means of the sensor 12, z.
  • rotation angle-dependent displacement movements of the flange 1 in the axial direction which are also referred to as shock measured.
  • the grinding process is stopped as soon as the measured values of the sensor 12 remain within a permissible tolerance range.
  • the offset movements that can still be measured on the flange surface 1 in the axial direction are between 2 and 8 ⁇ m, with an average of 4 ⁇ m being achieved.
  • Fig. 5 offset movements on the flange surface 1 of the wheel hub 2 have been measured for 69 machined parts.
  • the curve I shows the measurement results on assemblies that have been processed in accordance with the prior art, by the flange surface of the wheel hub was first finished and then the parts were assembled to a wheel bearing unit.
  • the rotation angle-dependent offset movements are in the range between 24 and 74 microns and on average at 51 microns.
  • the curve II shows the measurement results on the flange 1 of a process according to the invention processed wheel bearing unit.
  • the blow, d. H. the rotation angle-dependent offset movement is on average only 4 microns.
  • the tool arrangement shown in FIG. 3 also serves to machine flat surfaces of a disk brake which has a wheel bearing unit and a brake disk 13 fastened to the wheel hub 2 of the wheel bearing unit.
  • the wheel bearing unit is clamped in the manner described above on a workpiece carrier 6.
  • the brake disk 13 is fastened to the wheel hub 2.
  • the brake disc 13 is clamped with a pressure washer 14 and clamping screws 15 against the wheel hub 2, wherein the clamping screws 15 with a defined Pretension are tightened, which corresponds to the later use on the motor vehicle.
  • the wheel hub 2 is driven to rotate and the brake disk 13 is machined on both sides on the surfaces 13 ', 13 "The machining consists of a surface grinding of the braking surfaces 13', 13" using rotationally driven grinding wheels 16 ', 16 "which are delivered axially.
  • the wheel hub 2 is driven by a spindle 17, which is coupled on the upper side to the assembly to be machined. During grinding, an axial preload is applied to the wheel hub 2 to eliminate axial play of the rolling bearing assembly.
  • Fig. 4 shows a system that allows automatic processing as part of a series production.
  • Assemblies consisting of wheel bearing unit and brake disc 13 are clamped to workpiece carriers 6 of a turntable 18 and brought by a movement of the turntable 18 in the working area of a processing machine, which can be coupled to the assembly spindle 17 for the rotational drive of the wheel hub 2 and rotatably driven grinding wheels 16 for the double-sided machining of the brake disc 13 has.
  • the surfaces to be machined are ground flat.
  • Other processing methods eg. As turning or milling, should not be excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Rolling Contact Bearings (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Turning (AREA)
  • Braking Arrangements (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Bearbeitung planer Flächen einer Scheibenbremse bestehend aus Radlagereinheit und Bremsscheibe für Kraftfahrzeuge. Die Radlagereinheit umfasst eine Radnabe, eine Wälzlageranordnung und einen äußeren Lagerring, der eine Montagefläche zur Befestigung am Fahrzeug aufweist. Die Radnabe besitzt eine Flanschfläche zur Montage der Bremsscheibe.The invention relates to a method for machining flat surfaces of a disc brake consisting of wheel bearing unit and brake disc for motor vehicles. The wheel bearing unit comprises a wheel hub, a roller bearing assembly and an outer bearing ring having a mounting surface for attachment to the vehicle. The wheel hub has a flange surface for mounting the brake disc.

Ein derartiges Verfahren ist gemäß des Oberbegriffs des Anspruches 1 aus dem Dokument US 4 361 988 bekannt. Ein Verfahren zur Bearbeitung planer Flächen einer Scheibenbremse für Kraftfahrzeuge, bei dem die Bremsscheibe mit dem äußeren Lagerring verbunden ist, wird in US 5 430 926 beschrieben.Such a method is known from document US 4 361 988 according to the preamble of claim 1. A method for machining planar surfaces of a disc brake for motor vehicles in which the brake disc is connected to the outer bearing ring is described in US 5,430,926.

Wenn die ringförmige Flanschfläche nicht exakt rechtwinklig zur Rotationsachse ausgerichtet ist, führt die mit der Nabe rotierende Bremsscheibe Taumelbewegungen bzw. drehwinkelabhängige Versatzbewegungen in axialer Richtung aus, die auch als Schlag bezeichnet werden. Bereits geringfügige drehwinkelabhängige Versatzbewegungen bzw. Taumelbewegungen sind als Vibrationen, die sich auf das Bremspedal übertragen, bei einem Bremsvorgang spürbar. Bearbeitungsfehler an der Flanschfläche der Radnabe machen sich um so stärker bemerkbar, je größer die Bremsscheibe ist. Der beschriebene Effekt tritt daher insbesondere bei Kleintransportern, bei Pickups, bei Lastkraftwagen und ähnlichen Nutzfahrzeugen auf.If the annular flange surface is not aligned exactly at right angles to the axis of rotation, the brake disc rotating with the hub carries out wobbling movements or rotational angle-dependent offset movements in the axial direction, which are also referred to as impact. Even slight angle-dependent offset movements or wobbling movements are noticeable as vibrations that are transmitted to the brake pedal during a braking operation. Machining errors on the flange surface of the wheel hub are more noticeable, the larger the brake disc is. The effect described therefore occurs especially in vans, pickups, trucks and similar commercial vehicles.

Im Rahmen der bekannten Maßnahmen werden die Flächen der Radnabe fertig bearbeitet, bevor die Radnabe zusammen mit der Wälzlageranordnung und dem Lagerring zu einer Radlagereinheit montiert wird. Nach dem Einbau der Radlagereinheit im Fahrzeug ist regelmäßig an der Flanschfläche für die Bremsscheibe ein störender Schlag bei einer Drehbewegung der Radnabe feststellbar. Die drehwinkelabhängige Versatzbewegung liegt nach Messungen an Radnaben bei Nutzfahrzeugen oft in der Größenordnung von 40 bis 60 µm. Mit zunehmendem Durchmesser verstärkt sich der Schlag. Am äußeren Durchmesser der Bremsscheibe treten drehwinkelabhängige Versatzbewegungen in axialer Richtung von bis zu 100 µm auf, die sich bei Betätigung der Bremse als störende Vibrationen auf das Bremspedal übertragen.As part of the known measures, the surfaces of the wheel hub are finished before the wheel hub is mounted together with the rolling bearing assembly and the bearing ring to a wheel bearing unit. After installation of the wheel bearing unit in the vehicle a disturbing shock during a rotational movement of the wheel hub is regularly detected on the flange surface for the brake disc. The rotational angle-dependent offset movement is often in the order of 40 to 60 microns after measurements on hubs of commercial vehicles. As the diameter increases, the impact increases. On the outer diameter of the brake disk rotation angle-dependent displacement movements occur in the axial direction of up to 100 microns, which are transmitted to the brake pedal as a disturbing vibrations upon actuation of the brake.

Der Erfindung liegt die Aufgabe zugrunde, die Bearbeitung so durchzuführen, dass der an der Bremsscheibe einer im Fahrzeug eingebauten Scheibenbremse messbare Schlag vernachlässigbar klein ist.The invention has for its object to perform the machining so that the measurable blow on the disc of a built-in vehicle disc brake blow is negligible.

Gegenstand der Erfindung und Lösung dieser Aufgabe ist ein Verfahren zur Bearbeitung planer Flächen einer Scheibenbremse für Kraftfahrzeuge nach Anspruch 1.The object of the invention and solution to this problem is a method for processing flat surfaces of a disc brake for motor vehicles according to claim 1.

Nach der erfindungsgemäßen Lehre werden der äußere Lagerring und die Radnabe nicht als Einzelteile fertigbearbeitet, sondern erfolgt die Bearbeitung an der vormontierten Radlagereinheit. Dabei werden entweder die Flanschfläche der Radnabe oder die Bremsflächen dervorhermontierten Bremsscheibe bearbeitet. Die Radnabe der Radlagereinheit dient dabei stets als Spindel, so dass die gleichen Verhältnisse wie im späteren Einbauzustand am Fahrzeug herrschen. Die Erfindung beruht auf der Überlegung, dass die eingangs beschriebenen störenden drehwinkelabhängigen Versatzbewegungen, also der Schlag, auf diese Weise nahezu beseitigt werden können, da nach der Bearbeitung die Montagefläche des äußeren Lagerringes und die Flanschfläche der Radnabe bzw. die Bremsflächen der Bremsscheibe exakt planparallel ausgerichtet sind. Die geforderte Planparallelität zwischen Montagefläche und Bremsflächen der Bremsscheibe ist gewährleistet, wenn die Radlagereinheit mit der Montagefläche des äußeren Lagerringes auf einem Werkstückträger aufgespannt wird und die Baugruppe mit einem Schleifwerkzeug bearbeitet wird, dessen Schleiffläche parallel zum Werkstückträger ausgerichtet ist. Entsprechendes gilt für andere spanende Bearbeitungen, z. B. Drehen, Fräsen u. dgl.According to the teaching of the invention, the outer bearing ring and the hub are not finished as individual parts, but the processing takes place on the preassembled wheel bearing unit. In this case, either the flange surface of the wheel hub or the braking surfaces of the previously mounted brake disc are processed. The wheel hub of the wheel bearing unit always serves as a spindle, so that the same conditions prevail as in the later installed state on the vehicle. The invention is based on the consideration that the initially described disturbing angle-dependent offset movements, ie the impact, can be almost eliminated in this way, since aligned after machining the mounting surface of the outer bearing ring and the flange of the wheel hub and the braking surfaces of the brake disc exactly plane-parallel are. The required plane parallelism between the mounting surface and braking surfaces of the brake disc is ensured when the wheel bearing unit is clamped with the mounting surface of the outer bearing ring on a workpiece carrier and the assembly is machined with a grinding tool, the grinding surface is aligned parallel to the workpiece carrier. The same applies to other machining operations, eg. B. turning, milling u. like.

Danach dem erfindungsgemäßen Verfahren die Bremsflächen der Bremsscheibe bearbeitetwerden, wird die Bremsscheibe mit einer Andruckschreibe und Spannschrauben gegen die Radnaben vorgespannt und werden die Spannschrauben mit einer definierten Vorspannung, die dem späteren Einsatz am Kraftfahrzeug entspricht angezogen, bevor die Bremsflächen bearbeitet werden.After the method according to the invention, the braking surfaces of the brake disc are processed, the brake disc is biased with a Andruckschreibe and clamping screws against the hubs and tighten the clamping screws with a defined bias corresponding to the subsequent use on the motor vehicle before the braking surfaces are processed.

Gemäß einer bevorzugten Ausführung des erfindungsgemäßen Verfahrens wird die zu bearbeitende Fläche mit einem Sensor abgetastet und werden drehwinkelabhängige Versatzbewegungen in axialer Richtung gemessen. Sobald die Meßwerte des Sensors innerhalb eines zulässigen Toleranzbereiches bleiben, wird die Bearbeitung gestoppt.According to a preferred embodiment of the method according to the invention, the surface to be machined is scanned with a sensor and angular displacement movements are measured in the axial direction. As soon as the measured values of the sensor remain within a permissible tolerance range, processing is stopped.

Die Radnabe kann von der Spindel einer Werkzeugmaschine angetrieben werden, die den vorzugsweise ringförmig ausgebildeten Werkstückträger durchfaßt und unter Zwischenschaltung eines flexiblen Adapterelementes an die Radnabe angekuppelt wird. Durch das flexible Adapterelement kann eine etwaige geringe Exzentrizität zwischen der auf dem Werkstückträger aufgespannten, zu bearbeitenden Baugruppe und der Rotationsachse der Spindel ausgeglichen werden.The wheel hub can be driven by the spindle of a machine tool, which surrounds the preferably ring-shaped workpiece carrier and is coupled with the interposition of a flexible adapter element to the wheel hub. Due to the flexible adapter element, any slight eccentricity between the clamped on the workpiece carrier to be machined assembly and the axis of rotation of the spindle can be compensated.

Eine andere Ausführung des erfindungsgemäßen Verfahrens sieht vor, daß die Radnabe von einer Spindel angetrieben wird, die oberhalb an die zu bearbeitende Baugruppe angekuppelt wird. Zweckmäßig wird bei Lagern mit Axialspiel während der Bearbeitung eine axiale Vorlast zur Beseitigung eines axialen Spiels der Wälzlageranordnugn auf die Radlagereinheit aufgebracht.Another embodiment of the method according to the invention provides that the wheel hub is driven by a spindle, the above to be machined Assembly is coupled. It is expedient for axial bearing bearings to apply an axial preload to eliminate axial play of the rolling bearing arrangements on the wheel bearing unit during machining.

Der Werkstückträger ist ortsfest angeordnet oder kann auf einerTransporteinrichtung einer Bearbeitungsstation zugeführt werden. Vorzugsweise wird die zu bearbeitende Radlagereinheit oder aus Radlagereinheit und montierter Bremsscheibe bestehende Baugruppe an einem Werkstückträgern eines Drehtisches aufgespannt und durch eine Drehbewegung des Drehtisches in den Arbeitsbereich einer Bearbeitungsmaschine gebracht, die eine an die Baugruppe ankuppelbare Spindel für den rotierenden Antrieb der Radnabe sowie mindestens ein rotierend antreibbares Bearbeitungswerkzeug aufweist. Die Bearbeitungsstation kann beispielsweise als Doppelseitenschleifmaschine zur beidseitigen Bearbeitung der Bremsscheibe ausgelegt sein.The workpiece carrier is arranged stationary or can be fed on a transport device to a processing station. Preferably, the wheel bearing unit to be machined or consisting of wheel bearing unit and mounted brake disc assembly is clamped to a workpiece carriers of a turntable and brought by a rotary movement of the turntable in the working area of a processing machine, which can be coupled to the assembly spindle for the rotary drive of the wheel hub and at least one rotating having drivable machining tool. The processing station can be designed, for example, as a double-side grinding machine for double-sided machining of the brake disc.

Das erfindungsgemäße Verfahren eignet sich zur Finishbearbeitung planer Flächen einer Scheibenbremse für Kraftfahrzeuge, bei der die zu bearbeitenden Flächen mit einer rotierenden Schleifscheibe plan geschliffen werden. Als Schleifscheibe kann beispielsweise eine Topfscheibe verwendet werden, deren Rotationsachse zur Drehachse der Radnabe parallel versetzt angeordnet ist.The inventive method is suitable for finishing planar surfaces of a disc brake for motor vehicles, in which the surfaces to be machined are ground flat with a rotating grinding wheel. As a grinding wheel, for example, a cup wheel can be used, whose axis of rotation is offset parallel to the axis of rotation of the wheel hub.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung erläutert. Es zeigen schematisch

Fig. 1
in einer Seitenansicht, teilweise im Schnitt, eine Werkzeuganordnung zum Planschleifen einer Flanschfläche an einer Radnabe für Kraftfahrzeuge,
Fig. 2
den Schnitt II-II aus Fig. 1,
Fig. 3
eine Werkzeuganordnung zum doppelseitigen Schleifen einer Bremsscheibe nach dem erfindungsgemäßen Verfahren,
Fig. 4
eine Anlage zur Bearbeitung von Scheibenbremsen für Kraftfahrzeuge,
Fig. 5
Messwerte an einer nach dem erfindungsgemäßen Verfahren plan geschliffenen Flanschfläche einer Radnabe nach dem Einbau im Kraftfahrzeug im Vergleich zum Stand der Technik,
In the following the invention will be explained with reference to a drawing showing only one embodiment. It show schematically
Fig. 1
in a side view, partially in section, a tool assembly for surface grinding a flange on a wheel hub for motor vehicles,
Fig. 2
the section II-II of Fig. 1,
Fig. 3
a tool arrangement for double-sided grinding of a brake disk according to the method of the invention,
Fig. 4
a system for machining disc brakes for motor vehicles,
Fig. 5
Measured values on a flange surface of a wheel hub which has been ground flat according to the method according to the invention after installation in the motor vehicle in comparison with the prior art,

Mit der in Fig. 1 dargestellten Werkzeuganordnung wird an einer Radlagereinheit für Kraftfahrzeuge die Flanschfläche 1 einer Radnabe 2 bearbeitet. Die zu bearbeitende Flanschfläche 1 ist eine Anschlussfläche für eine Bremsscheibe.With the tool arrangement shown in FIG. 1, the flange surface 1 of a wheel hub 2 is machined on a wheel bearing unit for motor vehicles. The flange surface 1 to be machined is a connection surface for a brake disk.

Vor dem Planschleifen wird die Radnabe 2 mit einer Wälzlageranordnung 3 und einem äußeren Lagerring 4 zu einer Radlagereinheit montiert. Der äußere Lagerring weist eine Montagefläche 5 zur Befestigung am Fahrzeug auf. Die Radlagereinheit wird mit der Montagefläche 5 des äußeren Lagerringes 4 auf einem feststehenden Werkstückträger 6 aufgespannt. Der Werkstückträger 6 ist als präzisionsbearbeiteter Ring ausgebildet und auf dem Maschinenbett 7 einerwerkzeugmaschine positioniert. Durch z. B. sternförmig angeordnete Spannklammem 8 ist der äußere Lagerring 4 der Radlagereinheit auf dem Werkstückträger fixiert.Before the surface grinding, the wheel hub 2 is mounted with a rolling bearing assembly 3 and an outer bearing ring 4 to a wheel bearing unit. The outer bearing ring has a mounting surface 5 for attachment to the vehicle. The wheel bearing unit is clamped to the mounting surface 5 of the outer bearing ring 4 on a stationary workpiece carrier 6. The workpiece carrier 6 is designed as a precision machined ring and positioned on the machine bed 7 of a machine tool. By z. B. star-shaped Spannklammem 8, the outer bearing ring 4 of the wheel bearing unit is fixed on the workpiece carrier.

Die Radnabe 2 wird von einer Spindel 9 der Werkzeugmaschine rotierend angetrieben. Die Spindel 9 durchfaßt den ringförmig ausgebildeten Werkstückträger 6 und ist unter Zwischenschaltung eines flexiblen Adapterelementes 10 an die Radnabe 2 angekuppelt. Als Schleifscheibe zum Planschleifen der Radnabe wird eine Topfscheibe 11 verwendet, die mit einem nicht dargestellten Antrieb verbunden ist. Die Topfscheibe 11 rotiert und führt durch Richtungspfeile angedeutete axiale Zustellbewegungen aus.The wheel hub 2 is driven in rotation by a spindle 9 of the machine tool. The spindle 9 passes through the annular workpiece carrier 6 and is coupled with the interposition of a flexible adapter element 10 to the wheel hub 2. As a grinding wheel for surface grinding of the wheel hub a cup wheel 11 is used, which is connected to a drive, not shown. The cup wheel 11 rotates and performs indicated by directional arrows axial feed movements.

Während des Schleifvorganges wird die Flanschfläche 1 der rotierenden Radnabe 2 mit einem Sensor 12 abgetastet. Mittels des Sensors 12, z. B. eines Taststiftes, werden drehwinkelabhängige Versatzbewegungen der Flanschfläche 1 in axialer Richtung, die auch als Schlag bezeichnet werden, gemessen. Die Schleifbearbeitung wird gestoppt, sobald die Messwerte des Sensors 12 innerhalb eines zulässigen Toleranzbereiches bleiben. Nach der Bearbeitung betragen die an der Flanschfläche 1 noch messbaren Versatzbewegungen in axialer Richtung zwischen 2 und 8 µm, wobei im Mittel 4 µm erreicht werden.During the grinding process, the flange 1 of the rotating hub 2 is scanned with a sensor 12. By means of the sensor 12, z. As a stylus, rotation angle-dependent displacement movements of the flange 1 in the axial direction, which are also referred to as shock measured. The grinding process is stopped as soon as the measured values of the sensor 12 remain within a permissible tolerance range. After machining, the offset movements that can still be measured on the flange surface 1 in the axial direction are between 2 and 8 μm, with an average of 4 μm being achieved.

In Fig. 5 sind für 69 bearbeitete Teile Versatzbewegungen an der Flanschfläche 1 der Radnabe 2 gemessen worden. Der Kurvenzug I zeigt die Messergebnisse an Baugruppen, die nach dem Stand der Technik bearbeitet wurden, indem die Flanschfläche der Radnabe zunächst fertig bearbeitet wurde und anschließend die Teile zu einer Radlagereinheit montiert wurden. Die drehwinkelabhängigen Versatzbewegungen liegen im Bereich zwischen 24 und 74 µm und im Mittel bei 51 µm. Die Kurve II zeigt die Meßergebnisse an der Flanschfläche 1 einer nach dem erfindungsgemäßen Verfahren bearbeiteten Radlagereinheit. Der Schlag, d. h. die drehwinkelabhängige Versatzbewegung, beträgt im Mittel nur noch 4 µm.In Fig. 5, offset movements on the flange surface 1 of the wheel hub 2 have been measured for 69 machined parts. The curve I shows the measurement results on assemblies that have been processed in accordance with the prior art, by the flange surface of the wheel hub was first finished and then the parts were assembled to a wheel bearing unit. The rotation angle-dependent offset movements are in the range between 24 and 74 microns and on average at 51 microns. The curve II shows the measurement results on the flange 1 of a process according to the invention processed wheel bearing unit. The blow, d. H. the rotation angle-dependent offset movement is on average only 4 microns.

Die in der Fig. 3 dargestellte Werkzeuganordnung dient ebenfalls zur Bearbeitung planer Flächen einer Scheibenbremse, die,eine Radlagereinheit und eine an der Radnabe 2 der Radlagereinheit befestigte Bremsscheibe 13 aufweist. Die Radlagereinheit wird in der zuvor beschriebenen Weise auf einem Werkstückträger 6 aufgespannt. Vorher oder im Anschluss daran wird die Bremsscheibe 13 an der Radnabe 2 befestigt. Dazu wird die Bremsscheibe 13 mit einer Andruckscheibe 14 und Spannschrauben 15 gegen die Radnabe 2 verspannt, wobei die Spannschrauben 15 mit einer definierten Vorspannung angezogen werden, die dem späteren Einsatz am Kraftfahrzeug entspricht. Anschließend wird die Radnabe 2 rotierend angetrieben und die Bremsscheibe 13 beidseitig an den Flächen 13', 13" bearbeitet. Die Bearbeitung besteht aus einem Planschleifen der Bremsflächen 13',13" unter Verwendung rotierend angetriebener Schleifscheiben 16',16" die axial zugestellt werden. Die Radnabe 2 wird von einer Spindel 17 angetrieben, die oberseitig an die zu bearbeitende Baugruppe angekuppelt wird. Während der Schleifbearbeitung wird eine axiale Vorlast zur Beseitigung eines axialen Spiels der Wälzlageranordnung auf die Radnabe 2 aufgebracht.The tool arrangement shown in FIG. 3 also serves to machine flat surfaces of a disk brake which has a wheel bearing unit and a brake disk 13 fastened to the wheel hub 2 of the wheel bearing unit. The wheel bearing unit is clamped in the manner described above on a workpiece carrier 6. Before or after that, the brake disk 13 is fastened to the wheel hub 2. For this purpose, the brake disc 13 is clamped with a pressure washer 14 and clamping screws 15 against the wheel hub 2, wherein the clamping screws 15 with a defined Pretension are tightened, which corresponds to the later use on the motor vehicle. Subsequently, the wheel hub 2 is driven to rotate and the brake disk 13 is machined on both sides on the surfaces 13 ', 13 "The machining consists of a surface grinding of the braking surfaces 13', 13" using rotationally driven grinding wheels 16 ', 16 "which are delivered axially. The wheel hub 2 is driven by a spindle 17, which is coupled on the upper side to the assembly to be machined. During grinding, an axial preload is applied to the wheel hub 2 to eliminate axial play of the rolling bearing assembly.

Die Fig. 4 zeigt eine Anlage, die eine automatische Bearbeitung im Rahmen einer Serienfertigung ermöglicht. Baugruppen, bestehend aus Radlagereinheit und Bremsscheibe 13 werden an Werkstückträgern 6 eines Drehtisches 18 aufgespannt und durch eine Bewegung des Drehtisches 18 in den Arbeitsbereich einer Bearbeitungsmaschine gebracht, die eine an die Baugruppe ankuppelbare Spindel 17 für den Rotationsantrieb der Radnabe 2 sowie rotierend angetriebene Schleifscheiben 16 für die doppelseitige Bearbeitung der Bremsscheibe 13 aufweist.Fig. 4 shows a system that allows automatic processing as part of a series production. Assemblies consisting of wheel bearing unit and brake disc 13 are clamped to workpiece carriers 6 of a turntable 18 and brought by a movement of the turntable 18 in the working area of a processing machine, which can be coupled to the assembly spindle 17 for the rotational drive of the wheel hub 2 and rotatably driven grinding wheels 16 for the double-sided machining of the brake disc 13 has.

Gemäß den Ausführungsbeispielen werden die zu bearbeitenden Flächen plangeschliffen. Andere Bearbeitungsverfahren, z. B. Drehen oder Fräsen, sollen nicht ausgeschlossen sein.According to the embodiments, the surfaces to be machined are ground flat. Other processing methods, eg. As turning or milling, should not be excluded.

Claims (8)

  1. A method of machining flat faces of a disc brake for motor vehicles, wherein
    a wheel bearing unit consisting of a wheel hub (2), a rolling bearing arrangement (3) and an outer bearing ring (4) is clamped with the vehicle-side mounting face (5) of the bearing ring on a workpiece holder (6),
    the wheel hub (2) of the wheel bearing unit is driven in rotation, and
    a flange face (1) for a brake disc, which flange face is present on the wheel hub, or the braking faces of a brake disc mounted on the flange face, is/are machined, characterised in that the workpiece holder (6) is positioned on the machine bed (7) of a machine tool or is fed on a conveying device to a machining station, wherein the brake disc (13) is pre-stressed against the wheel hub (2) by a contact pressure disc (14) and clamping screws (15), and the clamping screws (15) are tightened to a defined pre-stress, which corresponds to subsequent use on the motor vehicle, before the braking faces are machined.
  2. A method according to claim 1, wherein the face to be machined is surface-ground by a rotating grinding wheel.
  3. A method according to claim 1 or 2, wherein a cup wheel is used as the grinding wheel, the axis of rotation of which is offset parallel to the axis of rotation of the wheel hub.
  4. A method according to any one of claims 1 to 3, wherein the face to be machined is scanned with a sensor, and run-out movements which are dependent on the angle of rotation are measured in an axial direction, and wherein machining is stopped as soon as the readings from the sensor remain within a permissible range of tolerance.
  5. A method according to any one of claims 1 to 4, wherein the wheel hub is driven in rotation by the spindle of a machine tool, which spindle passes through the workpiece holder of annular construction, and is coupled to the wheel hub with a flexible adaptor element interposed therebetween.
  6. A method according to any one of claims 1 to 5, wherein the wheel hub is driven by a spindle which is coupled to the upper face of the sub-assembly to be machined.
  7. A method according to claim 6, wherein the sub-assembly to be machined is clamped to a workpiece holder of a turntable and is brought into the working region of a machining machine by a movement of the turntable which machine comprises a spindle for driving the wheel hub in rotation and comprises at least one machining tool which can be driven in rotation.
  8. A method according to any one of claims 1 to 7, wherein an axial pre-stress is applied to the wheel bearing unit during machining to eliminate axial play in the rolling bearing arrangement.
EP00906212A 1999-01-19 2000-01-19 Method for machining plane surfaces of a disk brake for motor vehicles Expired - Lifetime EP1064120B2 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US09/233,595 US6071180A (en) 1999-01-19 1999-01-19 Method of surface grinding a flange surface of a wheel hub for an automotive vehicle
US233595 1999-01-19
US09/304,875 US6139405A (en) 1999-01-19 1999-05-04 Method of making a motor-vehicle brake-disk assembly
US304875 1999-05-04
PCT/EP2000/000394 WO2000043161A1 (en) 1999-01-19 2000-01-19 Method for machining plane surfaces of a disk brake for motor vehicles

Publications (3)

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EP1064120A1 EP1064120A1 (en) 2001-01-03
EP1064120B1 EP1064120B1 (en) 2002-10-09
EP1064120B2 true EP1064120B2 (en) 2006-09-20

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EP00906212A Expired - Lifetime EP1064120B2 (en) 1999-01-19 2000-01-19 Method for machining plane surfaces of a disk brake for motor vehicles

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US (1) US6139405A (en)
EP (1) EP1064120B2 (en)
JP (1) JP2002535152A (en)
DE (1) DE50000612D1 (en)
WO (1) WO2000043161A1 (en)

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US6575476B2 (en) 2001-06-27 2003-06-10 The Timken Company Chuck for holding a hub assembly
DE20207427U1 (en) 2002-05-10 2002-10-10 Müller, Michael, 96231 Bad Staffelstein grinder
DE10225988B4 (en) * 2002-06-11 2013-07-18 Emag Holding Gmbh Machine tool for processing brake discs
EP1486289A3 (en) * 2003-06-12 2005-03-09 Koyo Seiko Co., Ltd. Method of processing antifriction bearing unit for wheel
JP4876669B2 (en) * 2006-03-29 2012-02-15 株式会社ジェイテクト Manufacturing method of rolling bearing device for wheel
US9120195B2 (en) * 2009-02-20 2015-09-01 Diversified Machine, Inc. Wheel assembly and method for making same
TWI672191B (en) * 2013-10-16 2019-09-21 美商應用材料股份有限公司 System and method of chemical mechanical polisher with hub arms mounted

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Also Published As

Publication number Publication date
EP1064120B1 (en) 2002-10-09
EP1064120A1 (en) 2001-01-03
WO2000043161A1 (en) 2000-07-27
US6139405A (en) 2000-10-31
JP2002535152A (en) 2002-10-22
DE50000612D1 (en) 2002-11-14

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