EP2235393A1 - Frein à disque à auto-renforcement - Google Patents

Frein à disque à auto-renforcement

Info

Publication number
EP2235393A1
EP2235393A1 EP08838568A EP08838568A EP2235393A1 EP 2235393 A1 EP2235393 A1 EP 2235393A1 EP 08838568 A EP08838568 A EP 08838568A EP 08838568 A EP08838568 A EP 08838568A EP 2235393 A1 EP2235393 A1 EP 2235393A1
Authority
EP
European Patent Office
Prior art keywords
brake
self
disc
caliper
energizing
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Withdrawn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
EP08838568A
Other languages
German (de)
English (en)
Inventor
Dietmar Baumann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2235393A1 publication Critical patent/EP2235393A1/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Withdrawn legal-status Critical Current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
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • 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
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • 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
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/08—Self-amplifying or de-amplifying mechanisms
    • F16D2127/10—Self-amplifying or de-amplifying mechanisms having wedging elements

Definitions

  • the invention relates to a self-energizing disc brake having the features of the preamble of claim 1.
  • the disc brake is provided in particular as a wheel brake of a motor vehicle (motorcycle, motor vehicle).
  • Such a disc brake is known from the published patent application DE 103 02 516 A1.
  • the known disc brake has a brake caliper, in which on one side of a brake disc, a friction brake lining is arranged, which can be pressed to a brake actuation with an actuating device against the brake disc.
  • the known disc brake optionally provides an electromechanical actuating device with an electric motor, possibly a reduction gear and a spindle drive, that is, a helical gear, or a hydraulic actuating device with a hydraulic piston.
  • the actuator is on the same side of the Brake disc as the friction brake pad that can be pressed against the brake disk with it and is arranged on or in the brake caliper as a self-reinforcing device.
  • the actuator is also referred to as an actuator.
  • the known disc brake has a wedge mechanism with a wedge surface extending obliquely at a wedge angle to the brake disk, against and / or with which the friction brake lining is supported and along which it can be moved.
  • the wedge surface may be provided on / in the brake caliper and / or on the brake lining, in particular on its rear side facing away from the brake disk. If the rotating brake disk exerts a frictional force on the friction brake lining pressed against it when the disk brake is actuated, the support of the friction brake lining in the wedge angle on the wedge surface of the wedge mechanism effects a supporting force on the friction brake lining, which is directed perpendicular to the wedge surface.
  • a component of the supporting force acts on the friction brake lining perpendicular to the brake disk.
  • This component of the supporting force of the wedge mechanism is a pressing force that presses the friction brake lining against the brake disk.
  • the pressing force caused by the wedge mechanism acts on the friction brake lining in addition to an actuating force exerted by the actuating device, which together with the pressing force causes a clamping force with which the friction brake lining is pressed against the brake disk.
  • the wedge mechanism converts the frictional force exerted by the rotating brake disc on the friction brake pad pressed against it when the disc brake is actuated into a pressing force pressing against the brake disc against the brake disc brake pad. Due to the pressing force exerted on the friction brake lining in addition to the actuating force, a braking force of the disk brake is increased, the wedge mechanism causes a self-reinforcement of the disk brake.
  • the self-energizing is effective in both directions of rotation of the brake disc, the known disc brake with a double wedge mechanism oppositely inclined to the brake disc extending wedge surfaces.
  • the brake disc always displaces the friction brake lining pressed against it along the wedge surface, which runs obliquely toward the brake disk in the direction of rotation.
  • the known disc brake can also be understood as having two self-reinforcing devices which are each effective in a rotational direction of the brake disc.
  • the wedge mechanism acts on the brake caliper of the known disc brake in the sense of widening. Since the caliper is not absolutely rigid in practice, the wedge mechanism causes an elastic widening of the brake caliper, which lengthens a actuating travel of the actuating device. An actuation energy required for the brake actuation is correspondingly increased.
  • the self-energizing device of the disc brake according to the invention with the features of claim 1 is supported in both directions of rotation of the brake disc at different points of the caliper.
  • this is possible by arranging the wedge surfaces, which run at an angle opposite to the brake disk, at different points of the brake caliper, ie, they are supported at different points of the brake caliper.
  • the support levers opposite to the brake disk for effecting the self-reinforcement in the two directions of rotation of the brake disk can be articulated at different points of the brake caliper.
  • the pistons of the self-boosting device can be arranged at different points of the brake caliper.
  • the deformation of the caliper is in particular a widening due to the pressing force that causes the self-energizing device in a braking operation.
  • the actuating device of the brake disc is also supported on the different, separate points of the brake caliper, on which the self-reinforcing device is supported.
  • Support for the purposes of the invention is to be understood as a holding or attachment.
  • the caliper deforms due to the pressing force which causes the self-energizing device in a braking operation, deform or move only the body or areas of the brake caliper on which the self-energizing device is supported at the respective rotational direction of the brake disc.
  • the support of the actuating device in or on the brake caliper of the disc brake according to the invention is therefore not influenced by the deformation of the brake caliper due to the pressure force caused by the self-energizing device. That is, the position (s) of the caliper supporting the actuator rather than the self-energizing means in the respective rotational direction of the brake disc are not acted upon by the pressing force which causes the self-energizing means, but only by the operating force of the actuator. The deformation or movement of the actuating device in the respective direction of rotation of the brake disc supporting position / s of the caliper is thereby reduced.
  • the invention shortens the actuating travel to be performed by the actuating device and the actuating energy required for the brake actuation.
  • Advantages of the invention are a possible reduced mass and power consumption of the actuator.
  • the shortened by the invention actuating travel actuators with a short actuation travel as Ele- romagnete or possibly piezoelectric elements can be used. Possibly.
  • the separation of the various points of the caliper reduces noise and reduces vibration excitation.
  • the electrical system of a motor vehicle is less heavily burdened by the lower actuation energy, the control or regulating electronics for the brake actuation can be designed for lower power.
  • claim 2 provides an incision, so for example, a slot in the brake caliper, which divides the caliper into areas that are mutually movable by deformation.
  • the separate areas have the various locations at which the self-energizing device is supported in opposite directions when the brake disk rotates.
  • the incision separates the brake caliper in a region which can also be referred to as a yoke and spans the brake disk on the circumference and / or in an area which can also be referred to as a leg on the side of the brake disk on which the self-energizing device is located and is located or supported on the caliper.
  • On the other side of the brake disc of the caliper is formed without incision contiguous and thus connects the separated by the incision and by deformation mutually movable areas.
  • An embodiment of the invention according to claim 4 provides a Doppelram- pen mechanism for the effective in both directions of rotation of the brake disc self-energizing device.
  • the ramp angle of a ramp mechanism changes in the course of the ramp.
  • a decreasing with increasing displacement of the friction brake lining along the ramp ramp angle increases the self-boosting at high clamping and braking force.
  • a ramp mechanism can be understood as a generalization of a wedge mechanism, wherein a wedge mechanism a borderline case of a ramp mechanism, namely with the length of the ramp or the wedge constant ramp or wedge angle are understood.
  • the double ramp mechanism like the double wedge mechanism, has rising ramps in both directions of rotation of the brake disc to achieve self-energizing in both directions of rotation of the brake disc.
  • the invention is not limited to wedge or ramp mechanisms, it may also have other mechanical self-reinforcing devices, for example with support levers or a non-mechanical, for example, hydraulic self-reinforcing device. Also hydraulic self-reinforcing devices are known and should therefore not be explained in detail at this point.
  • the invention is preferably provided for an electromechanical see, self-energizing disc brake, ie a disc brake with electromechanical actuator.
  • an electromagnetic, pneumatic, hydraulic actuation or actuation with a piezoelectric element is also possible. The list is not exhaustive. Short description of the drawing
  • FIGURE shows a self-energizing disc brake according to the invention viewed radially to the brake disc from its axis to the outside.
  • the drawing is to be understood as a schematic and simplified representation for understanding and explanation of the invention.
  • disc brake 1 has a caliper (Faustsattel) designed as a caliper 2, which engages over a brake disc 3 with a region designated as a yoke 4 on the circumference of the brake disc 3.
  • a friction brake lining 7 is arranged immovably on an inner side of the leg 5 facing the brake disk 3 in the brake caliper 2. This friction brake lining 7 will also be referred to below as a fixed friction brake lining 7.
  • a friction brake pad 8 is arranged in the brake caliper 2, which is movable in the circumferential or rotational direction of the brake disc 3.
  • This friction brake pad 8 will be referred to below as a movable friction brake pad 8.
  • the caliper 2 is floating, that is, it is guided transversely to the brake disc 3 slidably.
  • the disc brake 1 has an electromechanical actuator
  • the electromechanical actuating device 9 has a
  • Electric motor a reduction gear and a spindle drive, so a Screw gear, on.
  • the electric motor may be, for example, a hollow shaft motor whose hollow shaft forms or has the ring gear of the planetary gear.
  • the sun gear of the planetary gear is also hollow and forms the nut of the spindle drive or has them.
  • the disc brake 1 may also be referred to as an electromechanical disc brake 1.
  • the invention is not limited to an electromechanical actuation, there are also other, for example, a mechanical, pneumatic, hydraulic or electromagnetic actuation or actuation with a piezoelectric element possible.
  • the movable Reibbremsbeleg 8 has on its rear side facing away from the brake disc 3 on a wedge body 12 with wedge surfaces 13.
  • the wedge surfaces 13 extend obliquely with opposite slopes in a wedge angle ⁇ to the brake disc 3.
  • the leg 6 of the caliper 2 has on its the brake disc 3 and the wedge body 12 facing inside to the wedge surfaces 13 parallel abutment surfaces 14, in which the wedge body 12 with its wedge surfaces 13 is supported.
  • rollers 15 are arranged as rolling elements for reducing friction.
  • the wedge body 12 with the movable Radbremsbelag 8 is along the abutment surfaces 14, so obliquely ⁇ in the wedge angle to the brake disc 3 to be displaced.
  • the direction of displacement may be in the direction of an imaginary chord to brake Disc 3 and obliquely in the wedge angle ⁇ to the brake disc 3 to be displaced.
  • the displacement of the wedge body 12 is a helical path whose imaginary axis coincides with a rotational axis of the brake disc 3.
  • a displacement is a small fraction of a full turn.
  • the wedge surfaces 13 and the abutment surfaces 14 are correspondingly helical. Other displacement directions of the wedge body 12 with the movable friction brake pad 8 are possible.
  • a friction force which exerts the rotating brake disc 3 when pressed disc brake 1 on the pressed against them, movable friction brake pad 8, acts on the friction brake pad 8 with the wedge body 12 in a narrowing wedge gap between one of the two abutment surfaces 14 and the brake disc 3.
  • the support of movable Reibbremsbelags 8 on the wedge body 12 on the abutment surface 14 causes a supporting force perpendicular to the abutment surface 14 on the wedge body 12 and the movable friction brake pad 8.
  • the support force has a component perpendicular to the brake disc 3, which presses the friction brake pad 8 against the brake disc 3.
  • the supporting force presses the friction brake lining 8 in addition to an actuating force exerted by the actuating device 9 against the brake disk 3 and thus increases a clamping force with which the friction brake lining 8 is pressed against the brake disk 3 as a whole.
  • the disc brake 1 thus has a self-boosting.
  • the wedge body 12 with the wedge surfaces 13 and the abutment surfaces 14 on the inside of the leg 6 of the caliper 2 form a wedge mechanism 16, in the manner explained by a force exerted by the rotating disc 3 on the actuated disc brake 1 against them friction brake pad 8 frictional force in a Pressure force converts the friction brake pad 8 presses against the brake disc 3.
  • the disc brake 1 thus has a mechanical self-boosting device 17 with the wedge mechanism 16.
  • the friction brake lining 8 with the wedge body 12 always shifts in the direction of rotation of the brake disk 3 and thereby along the abutment surface 14, which extends obliquely toward the brake disk 3 in the direction of rotation of the brake disk 3.
  • the amount of self-reinforcement depends on the wedge angle ⁇ , the same for both wedge surfaces 13, abutment surfaces 14 and directions of rotation of the brake disc 3 or may be different.
  • the caliper 2 has an incision 18, which passes through its yoke 4 and the legs 6 with the obliquely to the brake disc 3 extending abutment surfaces 14. As a result, the yoke 4 and the leg 6 of the caliper 2 are separated into two halves, which are movable relative to one another by deformation of the caliper 2.
  • the leg 5 of the caliper 2 is integrally continuous, he connects the two in the region of the yoke 4 and one leg 6 through the incision 18 two-part caliper Halves into which the indentation 18 divides the leg 6 of the caliper 2 are provided with the reference numbers 19, 20 and can generally also be referred to as areas or points 19, 20.
  • Each abutment surface 14 is formed on one of the two parts, in which the incision 18 divides the leg 6.
  • the abutment surfaces 14 form points 19, 20 of the caliper 2, on which the wedge mechanism 16 having self-reinforcing device 17 is supported, the support depending on the direction of rotation of the brake disc 3 each at one of the two abutment surfaces 14, ie at one of the two points 19th , 20, in which the incision 18 divides the caliper 2, supported.
  • the movable friction brake lining 8 is pressed against the rotating brake disk 3 with the actuating device 9 for braking operation.
  • the brake disk 3 acts on the friction brake lining 8 by frictional force in the narrowing wedge gap between one of the two abutment surfaces 14 and the brake disk 3.
  • the friction brake lining 8 with the wedge body 12 shifts along this one abutment surface 14 and is supported on one abutment surface 14.
  • the support causes, as already explained, a supporting force, which not only the friction brake pad 8 against the brake disc 3 presses, but as a reaction force the caliper 2 elastically expands, ie, deformed.
  • the support force deforms only half of the leg 19 of the caliper 2 2, along the abutment surface 14 of the wedge body 12 shifts and on which it is supported.
  • the other abutment surface 14 is relieved of the body 12 and is not subjected to a supporting force. Due to the separation by means of the incision 18, the unimpaired half 20 of the leg 6 and the yoke 4 of the caliper 2 is not deformed by the supporting force of the wedge mechanism 16 having self-reinforcing device 17.
  • the actuator 9 is also supported on both halves 19, 20 of the leg 6, in which the incision 18 divides the caliper 2. If one half 19 of the leg 6 is deformed by the supporting force of the self-reinforcing device 17, ie, pushed off by the brake disk 3, the actuating device 9 is supported on the other half 20 of the leg 6 of the caliper 2. This half 20 of the leg 6 of the caliper 2 is acted upon and deformed only by the actuating force of the actuator 9.
  • the amount of actuation force of the actuator 9 in relation to the supporting force of the self-energizing device 17 is dependent on the design and design of the self-energizing device 17, in particular the wedge angle ⁇ , the height of the Self-amplification (in addition to the coefficient of friction ⁇ between the brake disc 3 and the friction brake pad 8) is decisive. If the operating force of the actuator 9 is smaller than the supporting force of the self-energizing mechanism 17 having the wedge mechanism 16, even taking into account that the stiffness of the leg 6 by dividing into two halves for each of the two halves is only half as large as for an undivided leg is still the deformation of the part of the leg 6, which supports the actuator 9, even lower than it would be with undivided leg 6. This reduces one of the actuating device 9 for braking operation to be executed actuating path and the actuating energy. At the same time the dynamics of the brake actuation increases.
  • the recess 18 does not have straight, but may not have a straight shape and / or the two parts of the yoke 4 and of the leg 6 may consist of different materials with different stiffness and / or have different shapes to achieve different stiffnesses.
  • the invention is not limited to a mechanical self-amplifying device 17, but may for example also have a hydraulic self-amplifying device (not shown).
  • the hydraulic self-boosting device has, for each direction of rotation of the brake disk 3, a piston acting on the movable friction brake pad 8, one piston each being accommodated in one of the two parts of the leg 6, which are separated from one another by the cut 18.

Landscapes

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

Abstract

La présente invention concerne un frein à disque électromécanique à auto-renforcement (1) qui comporte un mécanisme à double rampe (16) muni de surfaces en coin (13) s'étendant dans des directions opposées, de manière oblique par rapport au frein à disque (3), et de surfaces d'appui (14). L'invention propose de diviser l'étrier (2) avec une incision (18) entre les surfaces d'appui (14) de telle sorte que la force d'appui du dispositif d'auto-renforcement (17) ne déforme pas (par élargissement) la zone de l'étrier (2) sur laquelle s'appuie le dispositif d'actionnement (9).
EP08838568A 2007-12-19 2008-12-08 Frein à disque à auto-renforcement Withdrawn EP2235393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007061093.0A DE102007061093B4 (de) 2007-12-19 2007-12-19 Selbstverstärkende Scheibenbremse
PCT/EP2008/067003 WO2009077368A1 (fr) 2007-12-19 2008-12-08 Frein à disque à auto-renforcement

Publications (1)

Publication Number Publication Date
EP2235393A1 true EP2235393A1 (fr) 2010-10-06

Family

ID=40365360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08838568A Withdrawn EP2235393A1 (fr) 2007-12-19 2008-12-08 Frein à disque à auto-renforcement

Country Status (3)

Country Link
EP (1) EP2235393A1 (fr)
DE (1) DE102007061093B4 (fr)
WO (1) WO2009077368A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2539716A (en) * 2015-06-26 2016-12-28 Meritor Heavy Vehicle Braking Systems (Uk) Ltd A disc brake

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10056451A1 (de) * 2000-11-14 2002-05-29 Bosch Gmbh Robert Scheibenbremse
DE10261455B8 (de) * 2002-12-31 2019-05-29 Robert Bosch Gmbh Reibungsbremse mit Selbstverstärkung
DE10302516A1 (de) 2003-01-23 2004-08-05 Robert Bosch Gmbh Scheibenbremse mit mechanischer Selbstverstärkung
DE10314449A1 (de) * 2003-03-31 2004-10-14 Robert Bosch Gmbh Sensoranordnung zur Kraftmessung
DE10321159A1 (de) * 2003-05-12 2004-12-02 Robert Bosch Gmbh Scheibenbremse mit mechanischer Selbstverstärkung
US20050230197A1 (en) * 2004-04-14 2005-10-20 Jedele Philip N One piece sliding brake caliper
DE102006002308A1 (de) * 2006-01-18 2007-07-19 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Selbstverstärkende Scheibenbremse mit Keilelementen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009077368A1 *

Also Published As

Publication number Publication date
WO2009077368A1 (fr) 2009-06-25
DE102007061093B4 (de) 2021-01-28
DE102007061093A1 (de) 2009-06-25

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