EP2038565A1 - Procédé et dispositif pour mesurer une force normale active sur un frein à disque - Google Patents

Procédé et dispositif pour mesurer une force normale active sur un frein à disque

Info

Publication number
EP2038565A1
EP2038565A1 EP07729753A EP07729753A EP2038565A1 EP 2038565 A1 EP2038565 A1 EP 2038565A1 EP 07729753 A EP07729753 A EP 07729753A EP 07729753 A EP07729753 A EP 07729753A EP 2038565 A1 EP2038565 A1 EP 2038565A1
Authority
EP
European Patent Office
Prior art keywords
sensor
brake
caliper
disc brake
target
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Withdrawn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
EP07729753A
Other languages
German (de)
English (en)
Inventor
Johannes Ante
Stephan Heinrich
Andreas Ott
Willibald Reitmeier
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.)
Aumovio Germany GmbH
Original Assignee
Continental Automotive Technologies GmbH
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 Continental Automotive Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of EP2038565A1 publication Critical patent/EP2038565A1/fr
Withdrawn legal-status Critical Current

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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0016—Brake calipers
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D2066/005—Force, torque, stress or strain

Definitions

  • the present invention relates to a method and an apparatus for measuring a force acting normal force on a disk brake, as a ⁇ is set especially in motor vehicles.
  • a disc brake has a known design on the hub of a wheel to be braked revolving brake disc to which friction linings in the form of brake pads or brake pads are pressed from both sides. These friction linings are mounted in a so-called caliper.
  • the caliper is also referred to as a brake caliper and spans the brake disk ⁇ .
  • the activation of the brake is generally hyd ⁇ raulisch using tor at least one brake piston as actuaries.
  • partial disk brakes are generally used, ie disk brakes that only use part of the surface of the disk as a friction surface.
  • floating caliper brakes are preferred.
  • Floating caliper brakes have, in contrast to fixed caliper brakes, the actuators only on one side of the disc.
  • the design of the floating caliper brake makes it possible to build the braking force on both sides of the brake caliper basically only one actuator.
  • the longitudinally displaceably mounted or floating suspended caliper transfers the pressure applied by only one actuator mechanically to the other side of the brake disc.
  • Floating caliper brakes require only relatively small space, so that a floating caliper brakes can be better placed at a lower height Ver ⁇ equal to fixed caliper brakes by this structure.
  • floating caliper brakes have a high efficiency and are relatively simple in construction and maintenance. So in particular friction or brake pads in a short time it will be exchanged. In an even lighter design with smaller dimensions, the floating caliper disc brake is used as a so-called pendulum caliper brake on motorcycles.
  • disc brakes serve as an actuator hydraulically operated pistons, which are displaceable by means of hydraulic pressure in corresponding actuators.
  • an electromechanical actuator is used in the case of an electromechanically actuated disc brake instead of a hydraulic cylinder.
  • a self-amplifying device can also be arranged, by means of which an actuating force generated by the electromechanical actuator is amplified automatically during a braking operation and without the supply of further external energy.
  • the disc brake can be controlled reliably and with a required accuracy to comply with a user-specified braking request and also to be able to report back to this.
  • the term "currently acting braking force” is understood to mean a force acting between the friction linings and the brake disk in a direction normal to the brake disk surface, which force is caused on the brake disk by friction linings pressed to decelerate.
  • various approaches are known from the prior art. These approaches build üb ⁇ SHORT- on to a deformation of an introduced into the power flow ei ⁇ ner brake sensor element.
  • Such sensor elements are regularly in a highly contaminated by dirt and high temperatures area of a brake, so that these sensors due to the adverse conditions either particularly protected and / or due to the high demands placed on them in terms of life and reliability even under rough Operating conditions are relatively expensive.
  • a partially slotted caliper verwen ⁇ det is used to measure a current normal force on a disc brake.
  • an elastic expansion of the brake caliper is used as the measured variable, wherein a component with a first, attached to the caliper end and a second, free end is used for measuring.
  • a gap whose respective current gap width is measured as a measure of a currently acting braking force and subsequently evaluated ⁇ .
  • the pitch used in ⁇ an electromechanical or electro-optical distance measurement to the slot.
  • a force-proportional path at the slot is about 0.5 mm in one embodiment.
  • the brake caliper deforms linearly elastically in a measuring range of interest with a good approximation.
  • a change in the slot width is measured by means of Wegmessauf commentary, for which purpose probes or distance sensors can be used on the basis of inductive or capacitive measurement methods, such as so-called.
  • Linear Variable Displacement Transducers or LVDT, or HALL cells For a thermally induced zero-point drift and / or nonlinearities of a réellesig ⁇ nals are compensatory measures and for calibration of the measuring device provided by reference sensors Meßwerttabellen provided.
  • Object of the present invention is the development of a device for measuring an acting normal force with substantial reduction of an additional space required in the field of disc brake and reducing sensitivity to thermal influences.
  • a shearing movement of a part of the disc brake relative to a reference is recorded or sensed by a sensor, in order to deduce a currently acting normal force on the basis of a measuring signal of the sensor in a measuring signal processing logic.
  • inductive eddy-current or eddy current sensors Such sensors generate a magnetic alternating field via a magnetic coil, which is damped by a counter body or target brought into the magnetic field by eddy currents. Depending on a target is close, the greater the damping. The degree of a respective attenuation is measured in a device and, for example, converted to a distance of the sensor relative to the target in a currently we ⁇ kende force.
  • these non-contact We ⁇ belstrom sensors can also measure a shift against an electrically conductive object to be measured wear. In principle, the test object may have both ferromagnetic and non-ferromagnetic properties.
  • a material which is particularly suitable for eddy-current measurements and which produces very clear output signals is preferably used as the target. Due to the high insensitivity to z. As oil, dirt, moisture, dust and interference fields, this measuring principle is very well suited for use in the harsh environment of a disc brake. At high refzi ⁇ sion and resolution in the measurement, such sensors are available with very good price / performance ratio in compact designs on the market. An already available of miniaturization ⁇ Siert typically sensor electronics can either be placed directly at the measurement location or in a central signal processing portion.
  • the magnetic coil of at least one eddy current sensor and a target carry out a shear movement relative to one another. If one measures a shear movement instead of an approximation, it is possible to resort to another space in the area of the disk brake. So ⁇ temerweit réelle have been gained for a given design of a disc brake and a sensor unit new degrees of freedom in the design and Sys. In particular, so at Constructions in which there is no space for a proximity sensor, however, a shear motion at a different location of a disc brake are measured, where there is still sufficient space available.
  • the target has a step.
  • this stage of the target is formed with a special geometry, so that the sensor a desired and in particular linear characteristic he holds ⁇ .
  • the eddy current sensor is in such a way
  • the brake caliper material usually consists of gray cast iron or aluminum or aluminum alloys. In principle, materials suitable for eddy current measurements can be used as the material of a target.
  • Figure 1 is a schematic sectional view of a basic structure of a floating caliper disc brake with an indication of the deformations occurring in the region of a brake caliper under the influence of a braking force;
  • FIG. 2 shows a brake caliper of a disk brake in a spatial view from above in the direction of a disk
  • FIGS 3a and 3b Details of the figures of Figures 1 and
  • FIG. 5 a diagram for the representation of measured sensor output voltages as a function of a respective displacement when parameterized by a
  • FIG. 1 shows a schematic representation of a basic structure of a floating caliper disc brake 1 for a motor vehicle in section.
  • the disc brake 1 comprises a hub 2 on a wheel of a not shown mitlau ⁇ Fende brake disk 3, are pressed against the both sides of the friction linings 4 in the form of brake linings under a braking operation overall. These friction linings 4 are mounted in a caliper 5, which spans the brake disk 3.
  • the disk brake 1 depicted has only one AK tuatoratti 6, on one side of the brake disk 3 is arranged.
  • the caliper 5 is mounted longitudinally displaceably on an axis 7, so that it applies a contact force F applied by the actuator unit 6 uniformly to both sides of the brake disk 3.
  • an electromechanically acting actuator unit 6 is to be used in the disc brake 1.
  • an electromechanically acting actuator unit 6 is to be used in the disc brake 1.
  • floating caliper disc brakes have the disadvantage of a relatively large elastic deformation or distortion, so that an imprecise festlegbarer
  • Figure 2 shows a three-dimensional view of the caliper 5 with a total U-shaped and not shown here brake disc 3 spanning shape and at right angles extending in the same direction arms 10, 12 for receiving the brake pads also not shown in Figure 2 4.
  • Die Arms 10, 12 are therefore connected in one piece with the caliper 5 with appropriate mechanical reinforcement by ribs 13.
  • guides 14, 15, 16 which are likewise connected in one piece with the caliper 5, a floating bearing of the entire disc brake 1 is achieved via the caliper 5 on two axles 7.
  • a device for measuring a current braking force is provided on the caliper 5, which measures an elastic widening of the caliper 5 in response to an applied braking force F by widening a gap width w of a gap 20.
  • This gap 20 is located between a substantially L-shaped, arm-like connected at one end to the caliper 5 component 24, the free, second end 26 is a measurement of the gap width w.
  • a shear of an edge 28 due to the application of force F by an eddy current sensor 30 is evaluated. Since the edge 28 is present over the entire component depth of the caliper 5 and is loaded in the same way under force by the force F in the course of the braking operation, the position of the eddy current sensor 30 along this exemplarily selected edge 28 in accordance with each one available standing space can be freely selected in a wide range.
  • Figures 4a to 4c show embodiments for different shapes in the region of the edge 28.
  • Figure 4a shows a simple, step-shaped extending edge 28 which upon movement of a magnetic head 31 of the sensor 30 an abrupt change of a large distance of the Magnetkop ⁇ 31 leads to an electrically conductive edge material toward a minimum distance d.
  • Figure 4b shows the step edge of Fig 4a with a ⁇ by following curvilinear undercut.
  • FIG. 4 c shows a continuous and monotonous curve of the edge 28, by which a curve of the output signal of the sensor 30 can be influenced over a distance.
  • a far-reaching linearization of the output signal curve can be achieved via a displacement path. It is of course irrelevant whether the sensor element 30 is displaced relative to the target or the edge 28, as is the case in Figures 4a, 4b, or whether the target or the edge 28 re ⁇ relative to a fixed Sensor element 30 is displaced, as is the case in Figure 4c.
  • FIG. 5 shows two measurements of a shearing movement by means of an eddy current sensor on a step-shaped target made of cast iron over a comparatively large lateral displacement path of up to 5 mm in length.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de mesurer une force normale active sur un frein à disque, du type de ceux utilisés dans des automobiles. L'invention vise à perfectionner un dispositif pour mesurer une force normale active, avec une réduction sensible d'un encombrement requis en plus dans la zone d'un frein à disque et par abaissement d'une sensibilité vis-à-vis d'influences thermiques. A cet effet, il est prévu qu'un mouvement de cisaillement d'une partie du frein à disque par rapport à une référence soit enregistré par un détecteur, afin de conclure à une force normale exercée au moment présent, sur la base d'un signal de mesure fourni par le détecteur dans une logique de traitement de signaux de mesure.
EP07729753A 2006-06-29 2007-05-31 Procédé et dispositif pour mesurer une force normale active sur un frein à disque Withdrawn EP2038565A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006029978A DE102006029978B3 (de) 2006-06-29 2006-06-29 Verfahren und eine Vorrichtung zum Messen einer wirkenden Normalkraft an einer Scheibenbremse
PCT/EP2007/055351 WO2008000578A1 (fr) 2006-06-29 2007-05-31 Procédé et dispositif pour mesurer une force normale active sur un frein à disque

Publications (1)

Publication Number Publication Date
EP2038565A1 true EP2038565A1 (fr) 2009-03-25

Family

ID=38441999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07729753A Withdrawn EP2038565A1 (fr) 2006-06-29 2007-05-31 Procédé et dispositif pour mesurer une force normale active sur un frein à disque

Country Status (4)

Country Link
US (1) US20090320579A1 (fr)
EP (1) EP2038565A1 (fr)
DE (1) DE102006029978B3 (fr)
WO (1) WO2008000578A1 (fr)

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JP4908998B2 (ja) * 2006-09-28 2012-04-04 本田技研工業株式会社 ブレーキ力検出装置
EP2245329B1 (fr) 2008-01-22 2014-03-19 KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH Frein à disque
DE102008022956A1 (de) * 2008-05-09 2009-11-12 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Hydraulische Scheibenbremse und Verfahren zum Steuern derselben
KR101482271B1 (ko) * 2008-09-19 2015-01-13 현대모비스 주식회사 전자 웨지 브레이크 시스템의 제동력 측정 센서 장치
EP2406517B1 (fr) * 2008-09-23 2012-10-17 Robert Bosch GmbH Boulon de fixation
DE102008042298A1 (de) * 2008-09-23 2010-03-25 Robert Bosch Gmbh Bremssattel für eine Scheibenbremse
DE102009041951B4 (de) * 2009-09-17 2020-04-02 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Messanordnung zur Zuspannkraftmessung einer Scheibenbremse und eine entsprechende Scheibenbremse
DE102010043320A1 (de) 2010-11-03 2012-05-03 Continental Teves Ag & Co. Ohg Vorrichtung und Verfahren zur Ermittlung einer Maßgröße für eine wirkende Bremskraft oder Reibkraft an einer Scheibenbremse
DE102011002567A1 (de) 2011-01-12 2012-07-12 Continental Teves Ag & Co. Ohg Scheibenbremse sowie Verfahren zur Ermittlung einer wirkenden Bremskraft oder eines wirkenden Bremsmoments
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CN102678789A (zh) * 2012-05-25 2012-09-19 浙江大学 一种应用于车辆的电涡流与摩擦一体化制动装置
DE102012223104A1 (de) 2012-12-13 2014-06-18 Continental Teves Ag & Co. Ohg Bremshalter zur Bestimmung einer Maßgröße für eine wirkende Bremskraft an einer Scheibenbremse eines Kraftfahrzeugs
DE102013213619A1 (de) * 2013-07-11 2015-01-15 Siemens Aktiengesellschaft Bremszuspanneinrichtung für eine Scheiben-Bremsvorrichtung
DE102013216027A1 (de) 2013-08-13 2015-02-19 Bayerische Motoren Werke Aktiengesellschaft Reibbelagbremse für ein Kraftfahrzeug, Bremskörper für eine solche Reibbelagbremse und Kraftfahrzeug mit einer solchen Reibbelagbremse
DE102015222931A1 (de) 2015-11-20 2017-05-24 Continental Teves Ag & Co. Ohg Anordnung zur Messung eines durch Bremskraft erzeugten Verschiebeweges
CN105424274A (zh) * 2015-12-16 2016-03-23 常州电站辅机总厂有限公司 新型阀门电动装置出厂试验摩擦式加载装置
CN110799395B (zh) * 2017-06-28 2021-12-03 弗克斯特有限公司 用于确定制动盘的位置偏差的方法和装置
IT201700075649A1 (it) * 2017-07-05 2019-01-05 Freni Brembo Spa Assieme di pinza e supporto e metodo
DE102018122011A1 (de) * 2018-09-10 2020-03-12 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Scheibenbremse für ein Kraftfahrzeug und Verfahren zum Erfassen eines Bremsmoments einer Scheibenbremse
IT201900025372A1 (it) * 2019-12-23 2021-06-23 Freni Brembo Spa Sistema e metodo per determinare una coppia di frenata mediante dispositivo di rilevazione di una forza ad un’interfaccia tra pinza freno e portamozzo
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DE102022211272A1 (de) 2022-10-25 2024-04-25 Continental Automotive Technologies GmbH Vorrichtung und Verfahren zur Ermittlung einer von einer Radbremse aufgebrachten Spannkraft

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Also Published As

Publication number Publication date
DE102006029978B3 (de) 2007-11-08
US20090320579A1 (en) 2009-12-31
WO2008000578A1 (fr) 2008-01-03

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