WO1986000859A1 - Braking device for motor vehicles - Google Patents

Braking device for motor vehicles Download PDF

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Publication number
WO1986000859A1
WO1986000859A1 PCT/EP1985/000358 EP8500358W WO8600859A1 WO 1986000859 A1 WO1986000859 A1 WO 1986000859A1 EP 8500358 W EP8500358 W EP 8500358W WO 8600859 A1 WO8600859 A1 WO 8600859A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
brake
brake cylinder
wheel
vehicle
Prior art date
Application number
PCT/EP1985/000358
Other languages
German (de)
French (fr)
Inventor
Günther Schier
Original Assignee
Schier Guenther
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 Schier Guenther filed Critical Schier Guenther
Publication of WO1986000859A1 publication Critical patent/WO1986000859A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/343—Systems characterised by their lay-out
    • B60T8/344—Hydraulic systems
    • B60T8/345—Hydraulic systems having more than one brake circuit per wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/3225—Systems specially adapted for single-track vehicles, e.g. motorcycles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
    • B62L3/00—Brake-actuating mechanisms; Arrangements thereof
    • B62L3/02—Brake-actuating mechanisms; Arrangements thereof for control by a hand lever
    • B62L3/023—Brake-actuating mechanisms; Arrangements thereof for control by a hand lever acting on fluid pressure systems

Definitions

  • the invention relates to a motor vehicle brake system according to the preamble of the main claim.
  • the braked vehicle wheels block as soon as they can no longer transmit the applied braking force completely to the road. Locking wheels impair the driving stability and the steerability of the vehicle. De3 further extends the braking distance.
  • the stepped piston of the master brake cylinder with its different pressure areas allows the pressure in the brake circuit to be regulated independently of the force actually applied by the driver.
  • the step-by-step connection of the individual effective pressure areas gradually reduces the pressure in the wheel brake cylinder if the vehicle wheel tends to lock. If the road conditions change, that is to say the grip changes, for example due to the transition from a snow-slick road to a dry road, the brake pressure in the wheel brake cylinders can be gradually built up again by successively locking the individual pressure surfaces.
  • control valves are provided as control means, which are controlled by an electronic computing unit.
  • Speed sensors attached to the respective vehicle wheel, provide the computing unit with a signal corresponding to the circumferential deceleration of the vehicle wheel.
  • the control valves which are assigned to the individual pressure stages, normally block the connection between the pressure stage and the wheel brake cylinder. When the control valve is switched over by the computing unit, the flow is released. Since at Brakes and when the valve is locked in the individual pressure stages brake fluid is displaced, this must be fed via a return to a reservoir. However, this return must be blocked during the pressure connection to the wheel brake cylinder. This function is also performed in a simple manner by the control valve. It is therefore advisable to design the ' control valves as 4/2-way valves.
  • the drawing shows in the single figure the schematic radar position of a brake system for a motorcycle and more precisely, the part of the brake system that is used to brake the front wheel. From the drawing, a stepped piston 1 can be seen, which is part of a master brake cylinder, not shown.
  • a manually operated brake lever 2 moves the stepped piston 1 in the axial direction when it is actuated in the direction of the force arrow 3, as is to be indicated by the arrow 4.
  • the hand brake lever 2 is pivotally articulated on a bearing block 5.
  • the step piston 1 provides three steps with effective
  • a brake line 9, 10, 11 leads from each pressure stage assigned to the respective pressure surface 6, 7, 8 to the wheel brake cylinder of the front wheel.
  • the brake line 9 of the smallest pressure area 8 leads directly to the wheel brake cylinder.
  • the other two brake lines take their way via control valves 13, 14.
  • the control valves 13, 14 are designed as electromagnetically actuated 4/2-way valves. In their non-excited state, they block the flow of the brake lines 10 and 11 to the wheel brake cylinder.
  • the brake shoe 12 works together with a brake disc 21.
  • Control lines 25, 26 go from the computing unit 24 to the control valves 13, 1.
  • the brake system works as follows:
  • the stepped piston 1 moves in the direction of the arrow 4.
  • a corresponding pressure builds up in the pressure stage which is assigned to the pressure surface 6 and propagates via the brake line 9 to the wheel brake cylinder.
  • the brake shoe 12 bears against the brake disc 21 with a force which is derived from the ratio of the area of the brake cylinder and the pressure surface 6 results. No pressure can build up in the two remaining pressure stages, since the oil displaced by the stage piston 1 flows back into the reservoir 17 via the return lines 15, 16.
  • the vehicle is decelerated by braking. If the circumferential deceleration of the vehicle wheel now falls below a defined threshold, which the computing unit 24 recognizes via the speed sensor 22, the computing unit 24 switches the control valve 13. As a result, the return line 15 is now blocked and the brake line 10 is opened. The pressure area 7 is added to the pressure area 6, so that overall the ratio between the brake cylinder area and the effective pressure area on the stepped piston 1 becomes smaller. The result is a pressure drop in the brake circuit. The brake shoe is accordingly pressed against the brake disk 21 with less force. If this pressure drop is not sufficient, the computing unit also switches the control valve 14 so that the effective pressure area on the step piston is increased by the pressure area 8. This lowers the pressure in the brake circuit again.
  • the computer generally switches the control valve 14 back to the initial state after a short time.
  • the braking force on the wheel brake cylinder increases again. If the vehicle wheel tends to lock again as a result, the computer switches the control valve 14 again.
  • the computing unit also blocks the control valve 13 and waits again for a blocking signal from the speed sensor 22. If such a signal does not come, this stage also remains closed. The maximum pressure that can be applied is thus applied to the wheel brake cylinder.
  • control valve 13 is opened again and possibly also the control valve 14.
  • Such a vehicle brake system is not limited to motorcycles. It can also be used for other motor vehicles, in particular passenger cars.

Abstract

A braking device for motor vehicles comprises a main brake cylinder and a differential piston (1). The differential piston (1) has a plurality of useful pressure surfaces (6, 7, 8) which may be connected or disconnected according to the needs by appropriate control devices (servo valves (13, 14)). Said device enables to regulate the pressure in the brake line independently from the power supplied by the differential piston (1). It enables to prevent to a large extent the blocking of the wheels of the vehicle.

Description

KraftfahrzeugbremsanlageMotor vehicle brake system
Die Erfindung bezieht sich auf eine Kraftfahrzeugbrems¬ anlage nach dem Oberbegriff des Hauptanspruchs.The invention relates to a motor vehicle brake system according to the preamble of the main claim.
Bei herkömmlichen Fahrzeugbremsen blockieren die gebrem¬ sten Fahrzeugräder, sobald sie die aufgebrachte Bremskraft nicht mehr vollständig auf die Fahrbahn übertragen können. Blockierende Räder beeinträchtigen die Fahrstabilität und die Lenkbarkeit des Fahrzeugs. De3 weiteren verlängert sich der Bremsweg.In conventional vehicle brakes, the braked vehicle wheels block as soon as they can no longer transmit the applied braking force completely to the road. Locking wheels impair the driving stability and the steerability of the vehicle. De3 further extends the braking distance.
Es sind Fahrzeugbremsanlagen εjuf dem ^arkt, die ein Blockieren der Fahrzeugräder verhindern. Solche Bremsan¬ lagen sind jedoch in ihrer Konstruktion aufwendig und daher teuer. Sie sind deshalb vornehmlich den Kraftfahr¬ zeugen der gehobenen Preisklasse vorbehalten. Des weiteren eignen sie sich nur bedingt für bestimmte Fahrzeugarten, wie beispielsweise für Motorräder. Denn je nach Ausführung weist eine solche blockiergeschü zte Fahrzeugbremsanlage entweder eine verhältnismäßig schwere hydraulische Puπpen- einheit oder einen winkelbeschleunigμngserkennenden Schwungradmechanismus auf. Der Einbau solcher schweren Teile sind für ein Motorrad nicht vertretbar. Außerdem geht bei solchen Fahrzeugbremsanlagen allmählich das Gefühl für des Bremsen verloren, was sich besonders für einen Motorradfahrer negativ auswirken kann. Aufgabe der Erfindung ist es daher, eine Fahrzeugbrems- anläge zu schaffen, die einfacher aufgebaut ist als her¬ kömmliche blockiergeschützte Fahrzeugbremsanlagen, die aber trotzdem ein Blockieren der Fahrzeugräder weitgehend verhindert.There are vehicle brake systems on the market that prevent the vehicle wheels from locking. However, such brake systems are complex in their construction and therefore expensive. They are therefore primarily reserved for motor vehicles in the upper price range. Furthermore, they are only conditionally suitable for certain types of vehicles, such as motorcycles. Because, depending on the version, such an anti-lock vehicle brake system either has a relatively heavy hydraulic pump unit or a flywheel mechanism that detects angular acceleration. The installation of such heavy parts is not justifiable for a motorcycle. In addition, with such vehicle brake systems, the feeling for braking is gradually lost, which can have a negative effect especially for a motorcyclist. The object of the invention is therefore to create a vehicle brake system which is of simpler construction than conventional anti-lock vehicle brake systems, but which nevertheless largely prevents the vehicle wheels from locking.
Die Aufgabe wird erfindungsgemäß gelöst mit den kenn¬ zeichnenden Merkmalen des Hauptanspruchs. Eine besonders vorteilhafte Ausgestaltung einer solchen Fahrzeugbrems- anl ge ergibt sich aus Anspruch 2.The object is achieved according to the invention with the characterizing features of the main claim. A particularly advantageous embodiment of such a vehicle brake system results from claim 2.
Durch den Stufenkolben des Hauptbremszylinders mit seinen unterschiedlichen Druckflächen läßt sich der Druck im Bremskreis losgelöst von der tatsächlich vom Fahrer auf- gebrachten Kraft regeln. Durch das stufenweise Hinzuschal¬ ten der einzelnen wirksamen Druckflächen vermindert sich der Druck in dem Radbremszylinder schrittweise, falls das Fahrzeugrad zum Blockieren neigt. Sollten sich die Fahr¬ bahnverhältnisse ändern, also die Griffigkeit wechseln, beispielsweise durch Übergang von einer schneeglatten Fahrbahn auf eine trockene Fahrbahn, so kann durch ein aufeinanderfolgendes Sperren der- einzelnen Druckflächen der Bremsdruck in den Radbremszylindern wieder schritt¬ weise aufgebaut werden.The stepped piston of the master brake cylinder with its different pressure areas allows the pressure in the brake circuit to be regulated independently of the force actually applied by the driver. The step-by-step connection of the individual effective pressure areas gradually reduces the pressure in the wheel brake cylinder if the vehicle wheel tends to lock. If the road conditions change, that is to say the grip changes, for example due to the transition from a snow-slick road to a dry road, the brake pressure in the wheel brake cylinders can be gradually built up again by successively locking the individual pressure surfaces.
In dem vorteilhaften Ausführungsbeispiel sind als Steuer¬ mittel Stellventile vorgesehen, die durch eine elektro¬ nische Recheneinheit angesteuert werden. Drehzahlfühler, an dem jeweiligen Fahrzeugrad abgebracht, liefern der Recheneinheit ein der Umfangverzögerung des Fahrzeugrades entsprechendes Signal. Die Stellventile, die den einzelnen Druckstufen zugeordnet sind, sperren normalerweise die Verbindung zwischen der Druckstufe und dem Radbrems¬ zylinder. Beim Umschalten des Stellventils durch die Recheneinheit wird der Durchfluß freigegeben. Da beim Bremsen und bei gesperrtem Ventil in den einzelnen Druck¬ stufen Bremsflüssigkeit verdrängt wird, muß diese über einen Rücklauf in einen Vorratsbehälter geführt werden. Dieser Rücklauf muß aber gesperrt sein während der durch- geschalteten Druckverbindung zu dem Radbremszylinder. In einfacher Weise wird diese Funktion ebenfalls von dem Stellventil übernommen. Es ist deshalb zweckmäßig, die ' Stellventile als 4/2- Wegeventile auszulegen.In the advantageous exemplary embodiment, control valves are provided as control means, which are controlled by an electronic computing unit. Speed sensors, attached to the respective vehicle wheel, provide the computing unit with a signal corresponding to the circumferential deceleration of the vehicle wheel. The control valves, which are assigned to the individual pressure stages, normally block the connection between the pressure stage and the wheel brake cylinder. When the control valve is switched over by the computing unit, the flow is released. Since at Brakes and when the valve is locked in the individual pressure stages brake fluid is displaced, this must be fed via a return to a reservoir. However, this return must be blocked during the pressure connection to the wheel brake cylinder. This function is also performed in a simple manner by the control valve. It is therefore advisable to design the ' control valves as 4/2-way valves.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung näher beschrieben und in der dazugehörigen Zeichnung dargestellt.An exemplary embodiment of the invention is described in more detail below and illustrated in the accompanying drawing.
Die Zeichnung zeigt in der einzigen Figur die Schemadar- Stellung einer Bremsanlage für ein Motorrad und genauer, den Teil der Bremsanlage, der zum Bremsen des Vorderrades dient. Aus der Zeichnung läßt sich ein Stufenkolben 1 entnehmen, der Bestandteil eines nicht näher dargestellten Hauptbremszylinders ist. Ein von Hand betätigter Brems¬ hebel 2 verschiebt bei seiner Betätigung in Richtung des Kraftpfeiles 3 den Stufenkolben 1 in axialer Richtung, wie dies mit dem Pfeil 4 angedeutet sein soll. Dabei ist der Handbremshebel 2 an einem Lagerbock 5 schwenkbar ange¬ lenkt.The drawing shows in the single figure the schematic radar position of a brake system for a motorcycle and more precisely, the part of the brake system that is used to brake the front wheel. From the drawing, a stepped piston 1 can be seen, which is part of a master brake cylinder, not shown. A manually operated brake lever 2 moves the stepped piston 1 in the axial direction when it is actuated in the direction of the force arrow 3, as is to be indicated by the arrow 4. The hand brake lever 2 is pivotally articulated on a bearing block 5.
Der Stufenkolben 1 sieht drei Stufen vor mit wirksamenThe step piston 1 provides three steps with effective
Druckflächen 6, 7, 8. Dabei weist die Druckfläche 6 den kleinsten Druchmesser auf, während sich der Durchmesser der Druckfläche 7 und 8 stufenweise erhöht. Von jeder der jeweiligen Druckfläche 6, 7 , 8 zugeordneten Druckstufe führt eine Bremsleitung 9, 10, 11 zu dem Radbremszylinder des Vorderrades. Die Bremsbacken des Radbremszylinders sind m'it 12 bezeichnet. Bevor die Bremsleitungen 9, 10, 11 in den Radbremszylinder eintreten, vereinigen sie sich zu einer einzigen Leitung. " Die Bremsleitung 9 der kleinsten Druckfläche 8 führt direkt zum Radbremszylinder. Die anderen beiden Brems¬ leitungen nehmen ihren Weg über Stellventile 13, 14. Die Stellventile 13, 14 sind als elektromagnetisch betätigbare 4/2-Wege-Ventile ausgelegt. In ihrem nichterregten Zustand sperren sie den Durchfluß der Bremsleitungen 10 und 11 zu dem Radbremszylinder.Printing areas 6, 7, 8. The printing area 6 has the smallest diameter, while the diameter of the printing area 7 and 8 increases gradually. A brake line 9, 10, 11 leads from each pressure stage assigned to the respective pressure surface 6, 7, 8 to the wheel brake cylinder of the front wheel. The brake shoes of the wheel, m 'denotes it 12th Before the brake lines 9, 10, 11 enter the wheel brake cylinder, they unite into a single line. " The brake line 9 of the smallest pressure area 8 leads directly to the wheel brake cylinder. The other two brake lines take their way via control valves 13, 14. The control valves 13, 14 are designed as electromagnetically actuated 4/2-way valves. In their non-excited state, they block the flow of the brake lines 10 and 11 to the wheel brake cylinder.
Von den Druckstufen der Druckflächen 7 und 8 gehen neben den Bremsleitungen auch noch Rückflußleitungen 15, 16 ab, die ebenfalls über die Stellventile 13, 14 führen und in einem Hydrauliköl- Vorratsbehälter 17 enden. Im nicht¬ erregten Zustand der Stellventile 13, 14 besteht unge¬ hinderter Rückfluß von der jeweiligen Druckstufe zu den Vorratsbehälter 17. Der Vorratsbehälter 17 versorgt die einzelnen Druckstufen über Zuflußleitungen 18, 19, 20 mit Hydrauliköl.From the pressure stages of the pressure surfaces 7 and 8, in addition to the brake lines, there are also return lines 15, 16, which likewise lead via the control valves 13, 14 and end in a hydraulic oil reservoir 17. In the non-excited state of the control valves 13, 14 there is unimpeded backflow from the respective pressure stage to the storage container 17. The storage container 17 supplies the individual pressure stages via inflow lines 18, 19, 20 with hydraulic oil.
Die Bremsbacke 12 arbeitet mit einer Bremsscheibe 21 zusammen. An der Stirnseite dieser Bremsscheibe 21, die in der Zeichnung wiederum nur angedeutet ist, befindet sich ein Drehzahlfühler 22, der über eine Signalleitung 23 mit einer elektronischen Recheneinheit 24 verbunden ist. Von der Recheneinheit 24 gehen Steuerleitungen 25, 26 zu den Stellventilen 13, 1 ab.The brake shoe 12 works together with a brake disc 21. On the front side of this brake disk 21, which is again only indicated in the drawing, there is a speed sensor 22 which is connected to an electronic computing unit 24 via a signal line 23. Control lines 25, 26 go from the computing unit 24 to the control valves 13, 1.
Die Bremsanlage arbeitet wie folgt:The brake system works as follows:
Betätigt der Motorradfahrer den Handbremshebel 2, ver- schiebt sich der Stufenkolben 1 in Richtung des Pfeiles 4. Dabei baut sich in der Druckstufe, die der Druckfläche 6 zugeordnet ist, ein entsprechender Druck auf, der sich über die Bremsleitung 9 zum Radbremszylinder fortpflanzt. Die Bremsbacke 12 legt sich an die Bremsscheibe 21 mit einer Kraft an, die sich aus dem Verhältnis der Fläche des Bremszylinders und der Druckfläche 6 ergibt. In den beiden übrgen Druckstufen kann sich kein Druck aufbauen, da das von dem Stufenkolben 1 verdrängte öl über die Rückflußleitungen 15, 16 in den Vorratsbehälter 17 zurück- fließt.If the motorcyclist actuates the hand brake lever 2, the stepped piston 1 moves in the direction of the arrow 4. A corresponding pressure builds up in the pressure stage which is assigned to the pressure surface 6 and propagates via the brake line 9 to the wheel brake cylinder. The brake shoe 12 bears against the brake disc 21 with a force which is derived from the ratio of the area of the brake cylinder and the pressure surface 6 results. No pressure can build up in the two remaining pressure stages, since the oil displaced by the stage piston 1 flows back into the reservoir 17 via the return lines 15, 16.
Durch die Bremsung wird das Fahrzeug verzögert. Fällt nun die Umfangsverzögerung des Fahrzeugrades unter eine fest¬ gelegte Schwelle, was die Recheneinheit 24 über den Dreh- zahlfühler 22 erkennt, schaltet die Recheneinheit 24 das Stellventil 13 um. Dadurch wird nun die Rückflußleitung 15 gesperrt und die Bremsleitung 10 geöffnet. Die Druckfläche 7 addiert sich zur Druckfläche 6, so daß insgesamt das Verhältnis zwischen Bremszylinderfläche und wirksame Druckfläche am Stufenkolben 1 kleiner wird. Die Folge ist eine Druckabsenkung im Bremskreis. Die Bremsbacke wird demnach, mit geringerer Kraft an die Bremsscheibe 21 ge¬ drückt. Sollte diese Druckabsenkung noch nicht ausreichen, schaltet die Recheneinheit auch das Stellventil 14 um, damit sich die wirksame Druckfläche am Stufenkolben noch um die Druckfläche 8 vergrößert. Dadurch wird der Druck abermals in dem Bremskreis abgesenkt.The vehicle is decelerated by braking. If the circumferential deceleration of the vehicle wheel now falls below a defined threshold, which the computing unit 24 recognizes via the speed sensor 22, the computing unit 24 switches the control valve 13. As a result, the return line 15 is now blocked and the brake line 10 is opened. The pressure area 7 is added to the pressure area 6, so that overall the ratio between the brake cylinder area and the effective pressure area on the stepped piston 1 becomes smaller. The result is a pressure drop in the brake circuit. The brake shoe is accordingly pressed against the brake disk 21 with less force. If this pressure drop is not sufficient, the computing unit also switches the control valve 14 so that the effective pressure area on the step piston is increased by the pressure area 8. This lowers the pressure in the brake circuit again.
Es könnte nun der Fall sein, daß sich das Fahrzeug während des Bremsvorganges auf einer weniger griffigen Fahrbahn befindet, die Griffigkeit sich jedoch plötzlich erhöht. In diesem Fall wird das Fahrzeugrad, wenn die drei Druck¬ stufen zugeschaltet sind, mit viel zu kleiner Kraft abge¬ bremst. Um dem vorzubeugen, schaltet der Rechner ganz generelldas Stellventil 14 nach kurzer Zeit in den Aus¬ gangszustand zurück. Die Bremskraft am Radbremszylinder erhöht sich wieder. Sollte das Fahrzeugrad dadurch aber¬ mals zum Blockieren neigen, schaltet der Rechner das Stellventil 14 wieder um. Sollte jedoch die Blockier- schwelle nicht unterschritten werden, sperrt die Rechen¬ einheit auch noch das Stellventil 13 und wartet abermals auf ein Blockiersignal des Drehzahlfühlers 22. Kommt ein solches Signal nicht, bleibt auch diese Stufe geschlossen. Am Radbremszylinder steht damit der maximal aufbringbare Druck an.It could now be the case that the vehicle is on a road with less grip during braking, but the grip suddenly increases. In this case, the vehicle wheel is braked with far too little force when the three pressure stages are engaged. In order to prevent this, the computer generally switches the control valve 14 back to the initial state after a short time. The braking force on the wheel brake cylinder increases again. If the vehicle wheel tends to lock again as a result, the computer switches the control valve 14 again. If, however, the blocking threshold is not fallen below, the computing unit also blocks the control valve 13 and waits again for a blocking signal from the speed sensor 22. If such a signal does not come, this stage also remains closed. The maximum pressure that can be applied is thus applied to the wheel brake cylinder.
Neigt das Fahrzeugrad zum Blockieren, wird das Stellventil 13 wieder geöffnet und gegebenenfalls auch das Stellventil 14.If the vehicle wheel tends to lock, the control valve 13 is opened again and possibly also the control valve 14.
Bisher wurde davon ausgegangen, als ob die einmal aufge¬ brachte Kraft dem Betrag nach konstant bliebe. In Wirk- lichkeit jedoch steigt diese Kraft über der Zeit an bis zu einer maximalen Kraft entsprechend der maximal mögli¬ chen Handkraft des Motorradfahrers. Dies ändert aber nichts an der vorgeschriebenen Wirkungsweise der Brems¬ anlage.So far it has been assumed as if the force once applied remained constant in amount. In reality, however, this force increases over time up to a maximum force corresponding to the maximum possible hand force of the motorcycle rider. However, this does not change the prescribed mode of operation of the brake system.
Es liegt auf der Hand, statt einen dreistufigen einen mehrstufigen Kolben vorzusehen. Dadurch lassen sich noch feinere Abstufungen vornehmen. Des weiteren bezieht sich * die vorgeschriebene Fahrzeugbremsanlage nur auf das Vorderrad. Es bereitet aber keinerlei Schwierigkeiten, auch das Hinterrad mit einer solchen Fahrzeugbremse aus¬ zurüsten. In diesem Fall wird die Bremskraft dann durch ein mit dem Fuß betätigbares Bremspedal eingeleitet, dem in gleicher Weise wie dem Handbremshebel 2 ein Stufen- kolben zugeordnet ist.It is obvious to provide a multi-stage piston instead of a three-stage one. This allows even finer gradations to be made. Furthermore, * the prescribed vehicle brake system only applies to the front wheel. However, there is no difficulty in equipping the rear wheel with such a vehicle brake. In this case, the braking force is then introduced by means of a brake pedal which can be operated with the foot and to which a stepped piston is assigned in the same way as the hand brake lever 2.
Es ist auch ohne weiteres einzusehen, daß eine solche Fahrzeugbremsanlage nicht auf Motorräder beschränkt ist. Sie läßt sich ebensogut für sonstige Kraftfahrzeuge, insbesondere Personenkraftwagen einsetzen. It is also readily apparent that such a vehicle brake system is not limited to motorcycles. It can also be used for other motor vehicles, in particular passenger cars.

Claims

1-•510 Patentansprüche: 1- • 510 claims:
1. Kraftfahrzeugbremsanlage mit einem Hauptbremszylinder, dessen Druckkolben einen dem einzelnen Fahrzeugrad zugeordneten Radbremszylinder beaufschlagt, dadurch1. Motor vehicle brake system with a master brake cylinder, the pressure piston acts on a wheel brake cylinder assigned to the individual vehicle wheel, thereby
15 gekennzeichnet, daß der Druckkolben als Stufenkolben (1) ausgelegt ist mit im Durchmesser größer werdenden Druckflächen (6; 7; 8) und daß über Steuerungsmittel die einzelnen Druckflächen (6; 7; 8) nacheinander zuschaltbar oder sperrbar sind.15 characterized in that the pressure piston is designed as a stepped piston (1) with increasing pressure surfaces (6; 7; 8) in diameter and that the individual pressure surfaces (6; 7; 8) can be switched on or off in succession via control means.
2020th
2. Bremsanlage nach Anspruch 1, mit wenigstens einem im Bremskreis zwischen dem Hauptbremszylinder und Rad¬ bremszylinder vorgesehenen Stellventil und mit einem die Umfangsverzögerung des Fahrzeugrades messenden2. Brake system according to claim 1, with at least one in the brake circuit between the master cylinder and Rad¬ brake cylinder provided control valve and with a measuring the circumferential deceleration of the vehicle wheel
25 Drehzahlfühler, durch dessen Signal eine elektronische Recheneinheit das Stellventil steuert, dadurch gekenn¬ zeichnet, daß die Druckstufe der im Durchmesser klein¬ sten Druckfläche (6) des Hauptbremszylinder mit dem Radbremszylinder ohne Zwischenschaltung eines Stell-25 speed sensor, by the signal of which an electronic processing unit controls the control valve, characterized in that the pressure stage of the smallest pressure surface (6) in diameter of the master brake cylinder with the wheel brake cylinder without the interposition of a control
30 ventils in Verbindung steht und daß jeder der übrigen Druckstufen ein Stellventil (13; 14) zugeordnet ist, das als elektromagnetisch betätigbares 4/2-Wege-Ventil ausgelegt ist und im nicht erregten Zustand den Durch¬ gang zwischen Druckstufe und Radbremszylinder sperrt30 valve is connected and that each of the remaining pressure stages is assigned a control valve (13; 14) which is designed as an electromagnetically actuable 4/2-way valve and blocks the passage between the pressure stage and the wheel brake cylinder when not energized
35 und den.Rückfluß zu einem Vorratsbehälter 17 freigibt, 35 and the reflux to a reservoir 17 releases
PCT/EP1985/000358 1984-07-19 1985-07-19 Braking device for motor vehicles WO1986000859A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3426612.7 1984-07-19
DE19843426612 DE3426612A1 (en) 1984-07-19 1984-07-19 MOTOR VEHICLE BRAKE SYSTEM

Publications (1)

Publication Number Publication Date
WO1986000859A1 true WO1986000859A1 (en) 1986-02-13

Family

ID=6241039

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Application Number Title Priority Date Filing Date
PCT/EP1985/000358 WO1986000859A1 (en) 1984-07-19 1985-07-19 Braking device for motor vehicles

Country Status (3)

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EP (1) EP0187848A1 (en)
DE (1) DE3426612A1 (en)
WO (1) WO1986000859A1 (en)

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DE4015745A1 (en) * 1989-10-06 1991-04-18 Teves Gmbh Alfred BLOCK-PROTECTED, HYDRAULIC BRAKE SYSTEM
DE19501487C2 (en) * 1995-01-19 1997-07-03 Deinlein Kalb Hans Device for combined anti-lock and traction control for motorcycles
DE19716404C1 (en) * 1997-04-18 1998-10-29 Lucas Automotive Gmbh Hydraulic brake system for motor vehicles
US6161903A (en) * 1997-04-18 2000-12-19 Lucas Industries Public Limited Company Brake-pressure-transmitter arrangement for a hydraulic motor-vehicle brake system, and brake system equipped therewith
JP4320968B2 (en) * 2000-05-02 2009-08-26 トヨタ自動車株式会社 Brake system
DE102004046940A1 (en) * 2004-02-06 2005-08-25 Continental Teves Ag & Co. Ohg Brake system for a motorcycle comprises a front wheel brake circuit in which during wheel slip control pressure build-up is determined according to an inlet/outlet valve switching position
KR101205745B1 (en) * 2004-02-06 2012-11-28 콘티넨탈 테베스 아게 운트 코. 오하게 Motorcycle brake system
DE102011008928A1 (en) * 2011-01-20 2012-07-26 Audi Ag Vehicle i.e. hybrid vehicle, has hollow volume provided with two partial volumes and distribution switch device, so that fluid pressure for braking body is optionally produced by brake fluid from one of partial volumes
DE102014208107A1 (en) * 2014-04-29 2015-10-29 Hema Maschinen- Und Apparateschutz Gmbh Clamping and / or braking device

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FR1435064A (en) * 1965-03-02 1966-04-15 Ferodo Sa Improvements to hydraulic brakes, especially for motor vehicles
DE1780416A1 (en) * 1968-09-13 1972-02-03 Roessner Hans Dipl Ing Stepped piston master cylinder for dual circuit brakes of motor vehicles
US3999807A (en) * 1970-10-06 1976-12-28 Tetsuo Haraikawa Dual network hydraulic brake system
GB1341338A (en) * 1971-06-14 1973-12-19 Fiat Spa Anti-skid braking systems
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DE2355541A1 (en) * 1973-11-07 1975-05-15 Knorr Bremse Gmbh VALVE DEVICE FOR THE CONTROL OF PRESSURE-ACTUATED BRAKES, IN PARTICULAR FOR RAIL VEHICLES
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Also Published As

Publication number Publication date
DE3426612C2 (en) 1988-07-28
EP0187848A1 (en) 1986-07-23
DE3426612A1 (en) 1986-01-30

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