WO2017093891A1 - Dispositif actionneur pour système de freinage combiné avant-arrière d'un véhicule automobile, système de freinage combiné avant-arrière d'un véhicule automobile et véhicule automobile correspondant - Google Patents

Dispositif actionneur pour système de freinage combiné avant-arrière d'un véhicule automobile, système de freinage combiné avant-arrière d'un véhicule automobile et véhicule automobile correspondant Download PDF

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Publication number
WO2017093891A1
WO2017093891A1 PCT/IB2016/057183 IB2016057183W WO2017093891A1 WO 2017093891 A1 WO2017093891 A1 WO 2017093891A1 IB 2016057183 W IB2016057183 W IB 2016057183W WO 2017093891 A1 WO2017093891 A1 WO 2017093891A1
Authority
WO
WIPO (PCT)
Prior art keywords
float
actuation
device body
braking
motor vehicle
Prior art date
Application number
PCT/IB2016/057183
Other languages
English (en)
Inventor
Marco CEREDA
Andrea Alberti
Fabio PELLEGRIS
Roberto Lavezzi
Original Assignee
Freni Brembo S.P.A.
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 Freni Brembo S.P.A. filed Critical Freni Brembo S.P.A.
Publication of WO2017093891A1 publication Critical patent/WO2017093891A1/fr

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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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/04—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting mechanically
    • B60T11/06—Equalising arrangements

Definitions

  • This invention relates to an actuator device for a combined rear-front braking system for a motor vehicle, a combined rear-front braking system for a motor vehicle and motor vehicle thereof.
  • the purpose of combined braking is to maximise the use of tyre-road friction and increase braking performance .
  • the purpose of this invention is to provide a reliable and economical combined brake system for motor vehicles, comprising both hydraulically and mechanically actuated braking devices that can be easily applied, even on pre-existing systems.
  • Such combined braking systems typically comprise a drum brake, mechanically actuated and placed on the rear wheel or axle, and at least one hydraulically actuated disc brake disposed on the front wheel or axle.
  • the braking action exerted on the rear or axle is less effective than that exerted on the front wheel or axle that, due to deceleration and the load transfer on the front axle, is able to ensure much greater deceleration in complete safety, i.e., without the risk of locking the related wheel or axle.
  • an actuator device for a combined rear-front braking system for a motor vehicle comprising a device body that houses and guides a float mechanically connected to a first cable for the mechanical actuation of an associable first braking device, wherein the float defines an axial direction,
  • a manual actuation lever or pedal mechanically connected to said device body so as to command the translation, along said axial direction, of a first actuating stroke in a first actuating direction, and so as to translate the first cable and actuate the first braking device
  • the device body delimits a hydraulic fluid chamber that houses said float suitable to put the fluid of said hydraulic fluid chamber under pressure, said chamber being fluidically connectable, by means of an output, to an associable second hydraulically-actuatable braking device, distinct from the first braking device, - wherein between the float and the device body are interposed elastic means so as to actuate the float and put the hydraulic fluid chamber under pressure as a result of the actuation of the actuating rod by means of the manual actuation lever or pedal,
  • the elastic means are arranged coaxially to the float, between a first shoulder of the device body and a plate integral with the float so as to be preloaded, and to influence the float in a rest condition in which the fluid in the hydraulic fluid chamber is not put under pressure by the float.
  • the device body drags in translation, along the axial direction, the first cable in the first actuation direction, wherein the device body delimits a hydraulic fluid chamber that houses a float suitable to put the fluid of said chamber under pressure when translated with respect to the device body, in the axial direction, of a second actuation stroke, in a second actuation direction opposite to the first actuation direction.
  • the device body comprises elastic means that exert an elastic thrust on the float in the first actuation direction to maintain the device body and the float axially integral with each other, said elastic means opposing the actuation thrust of the actuating lever or pedal, wherein the float moves with respect to the device body of said second actuating stroke in the second actuation direction, when the thrust exerted on the device body by the actuating lever or pedal exceeds the elastic thrust exerted by elastic means.
  • the float comprises a first connection end to a connection bush of the first cable so as to be always integral in translation with the first cable, which actuates the first braking device according to the first actuation direction .
  • connection bush realises an end-of-stroke stop against a second shoulder of the device body that defines the rest position of the float itself, so as to be able to translate with respect to the device body only for a second actuation stroke, in a second actuation direction opposite to said first actuation direction.
  • said second shoulder is arranged on the axially opposite side to said elastic means.
  • the device body is fluidically connected to a liquid reservoir connected to said hydraulic fluid chamber through a feed hole, wherein, in the rest condition of the actuator device, the feed hole is arranged axially spaced apart by a gasket of the float in the second actuation direction, the distance between the feed hole and the gasket of the float in the rest condition defining an idle stroke of the float, during which the fluid is not put under pressure by the float.
  • the gasket of the float is shaped so as to occlude the feed hole after performing a second actuation stroke greater than, or equal to, said idle stroke, in said second actuation direction.
  • said liquid reservoir is in one piece with the device body.
  • said actuator device is mechanically connected to the actuation lever or pedal by a second cable, and is connected to the device body by means of a rigid connection element, such as a link block.
  • a combined rear-front braking system for a motor vehicle comprising an actuator device as described above, and comprising, as a first braking device, a drum brake, mechanically connected to said first cable, and comprising as a second braking device, a disc brake having a disc brake calliper fluidically connected to said hydraulic fluid chamber of the device body.
  • said disc brake calliper is provided with an additional and independent manual lever or pedal actuation device.
  • said braking system is a combined rear-front braking system, wherein the first mechanically-actuated braking device is at least a drum brake disposed on a rear axle of the motor vehicle and the second hydraulically-actuated braking device is at least a disc brake arranged on the front axle of the motor vehicle.
  • Figure 2 is a partial schematic side view of a system comprising an actuator device according to an embodiment of this invention, in a rest configuration;
  • Figure 3 is a sectional view of the system of Figure 2, in a rest configuration
  • Figure 4 is a sectional view of the system of Figure 2, in an actuation or braking configuration
  • Figure 5 is a schematic side view of a braking device according to an embodiment of this invention, in a rest configuration, in which the dashed lines represent the same device in braking configuration;
  • Figure 6 is a schematic side view of the braking device of Figure 5, in braking configuration
  • Figure 7 is a sectional view of the braking device of Figure 5, in a rest configuration
  • Figure 8 shows a sectional view of the braking device of Figure 6, in braking configuration
  • Figure 9 is a schematic view of a distribution of braking between two separate braking devices operatively connected to the actuator device of this invention.
  • Figures 10 to 11 are perspective views of front axles of motor vehicles comprising actuator devices 4 according to possible variants of this invention.
  • the reference number 4 globally indicates an actuator device for a combined rear-front braking system for a motor vehicle 8.
  • motor vehicle For the purposes of this invention the concept of motor vehicle must be understood in a broad sense, including not only a motorcycle, but also a three-wheeled vehicle and even a motorised quadricycle.
  • the actuator device 4 comprises a device body 12 ) that houses and guides a float 14 mechanically connected to a first cable 16 for the mechanical actuation of an associable first braking device 20, wherein the float defines an axial direction X-X.
  • the first braking device 20 can for example comprise a drum brake typically comprising actuatable jaws in contact against a drum integral to a wheel hub, in a known manner.
  • the actuator device 4 comprises a manual actuation lever or pedal 24, mechanically connected to said device body 12 so as to command the translation, along said axial direction X-X, of a first actuating stroke 26 in a first actuating direction A, and so as to translate the first cable 16 and actuate the first braking device 20.
  • Said actuator device 4 can be mechanically connected to the actuation lever or pedal 24 by a second cable 25, and is connected to the device body 12 by means of a rigid connection element 27, such as a link block.
  • the device body 12 delimits a hydraulic fluid chamber 28 that houses a float 14 suitable for putting the fluid of said hydraulic fluid chamber 28 under pressure.
  • the hydraulic fluid chamber 28 is fluidically connectable, via an output 36, to an associable second hydraulically-actuated braking device 40, separate from the first braking device 20.
  • the second braking device 40 comprises a hydraulically-actuated disc brake calliper.
  • disc brake calliper is not relevant, comprising callipers of the fixed or floating type, or further configurations.
  • Said disc brake calliper 40 can be provided with an additional and independent manual lever or pedal actuation device 42.
  • the device body 12 drags in translation, along the axial direction X-X, the first cable 16 in the first actuation direction A.
  • the device body 12 delimits a hydraulic fluid chamber 28 that houses the float 14 suitable to put the fluid of said chamber 28 under pressure when translated with respect to the device body 12, in the axial direction X-X, of a second actuation stroke 56, in a second actuation direction B opposite to the first actuation direction A.
  • the device body 12 comprises elastic means 44 that exert an elastic thrust on the float 14 in the first actuation direction A to maintain the device body 12 and the float 14 axially integral with each other, said elastic means 44 opposing the actuation thrust of the actuation lever or pedal 24.
  • the float 14 translates with respect to the device body 12 of said second actuation stroke 56 in the second actuation direction B, when the thrust exerted on the device body 12 by means of the actuation lever or pedal 24 exceeds the elastic thrust exerted by the elastic means 44.
  • These elastic means are a first calibration of the actuator device 4 since the activation or actuation of the second braking device 40 does not take place until the elastic thrust exerted by the elastic means is exceeded by the thrust exerted on the device body 12 by the user acting on the actuating lever or pedal 24.
  • the elastic characteristic and therefore the stiffness of the elastic means 44 it is possible to raise the threshold of intervention of the automatic activation of the second braking device 40 following manual actuation of the first braking device 20, and vice versa.
  • the elastic means 44 are arranged coaxially to the float 14, between a first shoulder 48 of the device body 12 and a plate 50 integral with the float 14 so as to be preloaded, and to influence the float 14 in a rest condition in which the fluid in the hydraulic fluid chamber 28 is not put under pressure by the float 14.
  • the float 14 comprises a first connection end 52 to a connection bush 53 of the first cable 16 so as to be always integral in translation with the first cable 16, which actuates the first braking device 20 according to the first actuation direction A.
  • Said connection bush 53 realises an end-of-stroke stop against a second shoulder 54 of the device body 12 that defines the rest position of the float 14 itself, so as to be able to translate with respect to the device body 12 only for a second actuation stroke 56, in a second actuation direction B opposite to said first actuation direction A.
  • the second shoulder 54 defines the maximum translation of the float 14 with respect to the device body 12, in the first actuation direction A.
  • said second shoulder 54 is arranged on the axially opposite side to said elastic means 44.
  • the device body 12 is fluidically connected to a liquid reservoir 57 connected to said hydraulic fluid chamber 28 through a feed hole 60, wherein, in the rest condition of the actuator device 4, the feed hole 60 is arranged axially spaced apart by a gasket 64 of the float 14 in the second actuation direction B, said gasket 64 being disposed on the head of the float 14.
  • said gasket 64 is a lip gasket .
  • the liquid reservoir 57 can also be in one piece with the device body 12.
  • the liquid reservoir is provided with an upper cap 58 and, according to a possible embodiment, a porthole 59 for checking the level of liquid contained in it.
  • the distance between the feed hole 60 and the gasket 64 of the float 14 in the rest condition defines an idle stroke 68 of the float 14, during which the feed hole 60 puts in communication the hydraulic fluid chamber 28 and the liquid reservoir 57, and the fluid is not pressurised by the float 14.
  • Such idle stroke 68 represents a second calibration of the actuator device since the activation or actuation of the second braking device 40 does not take place until the actuating lever or pedal 24 is actuated so as to translate the float 14 for a second actuation stroke 56 at least equal to said idle stroke 68.
  • the gasket 64 of the float 14 is shaped so as to occlude the feed hole 60 after performing a second actuation stroke 56 greater than, or equal to, said idle stroke 68, in said second actuation direction B.
  • the braking system is a combined rear- front braking system, wherein the first mechanically- actuated braking device 20 is at least a drum brake disposed on a rear axle 90 of the motor vehicle 8 and the second hydraulically-actuated braking device 40 is at least a disc brake arranged on a front axle 92 of the motor vehicle 8.
  • the actuator device 4 is fixed to a frame 88 of the motorcycle, in a distal position with respect to the handlebar, so as not to interfere with the space available in proximity of the handlebar.
  • said actuator device 4 is fixed to the frame 88 in a vertical position, i.e., with the upper cap 58 facing upwards and the porthole 59 facing downwards, i.e., towards the ground.
  • the actuator device 4 be fixed to a portion of handlebar 89 of the motorcycle .
  • “combined rear-front braking system” means that the single actuation of the first braking device 20, preferably disposed on the rear axle 90, also automatically determines the actuation of the second braking device 40 disposed on the front axle 92. It is clear that, for the purposes of this invention, it is also possible to obtain a combined front-rear braking system so that the single actuation of the first braking device 20, disposed on the front axle 92, also automatically determines the actuation of the second braking device 40 disposed on the rear axle 90.
  • the float 14 is in a rest configuration, and therefore the feed hole is not occluded by the float 14 itself, i.e., by its gasket 64 ( Figure 3.7); in other words, in this configuration there is fluid connection between the reservoir 57 and the hydraulic fluid chamber 28, for which the latter is not put under pressure by the float 14 itself and does not activate, through the output 36, the second braking device 40. So, a force is exerted on the actuation lever or pedal 24 in order to operate a braking of the vehicle 8.
  • This manual action on the actuation lever or pedal 24 determines the displacement of the device body 12 associated to said actuation lever or pedal 24 through the rigid connection element, such as for example the link block 27.
  • the displacement of the device body 12 also determines the translation of the float 14 and the first cable 16 in the first actuation direction A of a first actuating stroke 26. This translation of the first cable 16 determines a first braking action by means of the first braking device 20 mechanically connected to this.
  • the first intervention or automatic actuation calibration of the second braking device 40 is therefore due to the choice of the elastic constant of the elastic means 44. If the device 4 is configured so that in the rest configuration the gasket 64 of the float 14 is flush with the feed hole 60 (i.e., in the absence of the idle stroke 68), then the immediate displacement of the float of the second actuation stroke 56 corresponds to a substantially immediate actuation of the second braking device 40 as a result of putting the fluid in the chamber 24 under pressure. In fact, this putting under pressure only occurs after the feed hole 60 is occluded. In this case the intervention calibration of the actuator device 4 is performed by playing exclusively on the elastic constant and the elastic means 44.
  • the intervention calibration of the second braking device 40 is also performed in the light of a first stroke of the float 14: in other words, the fluid chamber 28 does not go under pressure and therefore does not activate the second braking device until the float follows a second actuation stroke 56 in the second actuation direction B at least equal to said idle stroke 68.
  • the plate 50 of the float performs the function of mechanical limiter of the amount of fluid sent that generates a pressure increase in the second hydraulically-actuated braking device, so as to avoid the risk of locking of the corresponding wheel: in fact, when said plate 50 abuts against the first shoulder 48 of the device body, it prevents the related stroke of the float 14 with respect to the hydraulic fluid chamber 28, i.e., it locks the second actuation stroke and therefore prevents the further increase of pressure in the hydraulic fluid chamber 28.
  • a possible actuation scheme of the braking device by means of the actuator device 4 of this invention is, for example, illustrated in Figure 9.
  • the abscissa shows the braking force exerted by the second hydraulically-actuated braking device 40 and the ordinate shows the braking force exerted by the first mechanically-actuated braking device 20.
  • the braking is not combined since it is performed only by the first braking device 20.
  • braking begins to be exerted also by the second hydraulically-actuated braking device 40 (see section B of the curve) .
  • the system is calibrated to limit the maximum braking exercisable by the second hydraulically-actuated braking device 40, as seen in section C of the curve.
  • This limitation is achieved by reaching the stop between the plate 50 of the float 14 and the first shoulder 48 of the device body 12; this stop prevents a relative motion in the second actuation direction B between the float 14 and the device body 12 and thus prevents the increase of pressure inside the hydraulic fluid chamber 28.
  • the mounting of the actuator device 4 on the frame of the motor vehicle 8 can be reversed: in other words, it is possible to mount the actuator device 4 either having the second cable 25 connected mechanically to the link block 27 and the first cable 16 connected to the first braking device 20 by means of the connection bush 53 ( Figure 10), or having the second cable 25 connected mechanically to the connection bush 53 and the first cable 16 connected to the first braking device 20 by means of the link block 27 ( Figure 11) .
  • the two cited solutions are mechanically equivalent to each other and likewise protected by this invention.
  • the actuator device for a combined rear-front braking system for a motor vehicle according to the invention allows overcoming the drawbacks presented in the prior art.
  • the actuator device allows manual actuation, by the user, of the mechanical braking device for example on a rear wheel or axle and, as a function of its calibration, also automatically actuating the hydraulic braking device disposed, for example, on the front wheel or axle.
  • the actuator device of this invention is simple and inexpensive to produce and can easily be inserted into a pre-existing non-combined brake system, i.e., with separate and independent actuation of the various braking devices, so as to make it become a combined type system, preferably from the rear towards the front, increasing the effectiveness of the braking system itself.
  • the intervention of the combined braking can be easily calibrated not only as a function of the type of vehicle but also of its load, by acting, as seen, on the calibration, i.e., on the preload of the spring.
  • the braking system thus configured is always safe and reliable since, in case of failure of the actuator described, the operation of the individual braking devices is not affected but, at most, automatic combined braking is not achieved.
  • this invention is also applicable to vehicles with cable command on the handlebar and with little availability of space on the handlebar, such as for example scooters.
  • a mechanical limiter is provided of the output pressure to the second hydraulically-actuated braking device so as to avoid the risk of locking of the corresponding wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Regulating Braking Force (AREA)
  • Braking Systems And Boosters (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

On décrit un dispositif actionneur (4) pour système de freinage combiné avant-arrière d'un véhicule automobile (8) comprenant: un corps du dispositif (12) qui reçoit et guide un flotteur (14) relié mécaniquement à un premier câble (16) pour l'actionnement mécanique d'un premier dispositif de freinage (20) associable. Le flotteur délimite une direction axiale (X-X), un levier ou pédale d'actionnement manuel (24), relié mécaniquement audit corps du dispositif (12) de façon à commander la translation, le long de ladite direction axiale (X-X), d'une première course d'actionnement (26) dans une première direction d'actionnement (A). Le corps du dispositif (12) délimite une chambre de fluide hydraulique (28) qui loge ledit flotteur (14) et peut être reliée de manière fluidique à un second dispositif de freinage à commande hydraulique (40) associable, distinct du premier dispositif de freinage (20). Des moyens élastiques (44) sont interposés entre le flotteur (14) et le corps du dispositif (12). Le flotteur (14) et le premier câble (16) sont parallèles et disposés en série le long de ladite direction axiale (X-X).
PCT/IB2016/057183 2015-11-30 2016-11-29 Dispositif actionneur pour système de freinage combiné avant-arrière d'un véhicule automobile, système de freinage combiné avant-arrière d'un véhicule automobile et véhicule automobile correspondant WO2017093891A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102015000078337 2015-11-30
ITUB2015A006014A ITUB20156014A1 (it) 2015-11-30 2015-11-30 Dispositivo attuatore per un impianto frenante combinato posteriore-anteriore di motoveicolo, impianto frenante combinato posteriore-anteriore di motoveicolo e relativo motoveicolo

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800002765A1 (it) * 2018-02-16 2019-08-16 Piaggio & C Spa Impianto frenante combinato anteriore-posteriore di un motoveicolo e relativo motoveicolo
EP3599151A1 (fr) * 2018-07-25 2020-01-29 Raicam Driveline S.r.l. Actionneur hydraulique pour système de freinage combiné arrière-avant d'une motocyclette
IT202000007483A1 (it) * 2020-04-08 2021-10-08 Blubrake S R L Dispositivo attuatore di abs per un sistema idraulico di frenatura di bicicletta
WO2022070091A1 (fr) * 2020-10-02 2022-04-07 C.R.G. S.R.L. Pompe pour systèmes de freinage pour véhicules, en particulier des karts et similaires

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE828640C (de) * 1948-10-22 1952-01-21 Bosch Gmbh Robert Handbremsvorrichtung fuer Kraftfahrzeuge
EP1614600A1 (fr) * 2004-07-07 2006-01-11 ROBERT BOSCH GmbH Dispositif d'actionnement hydraulique de frein de stationnement et procédé de commande d'un tel dispositif
JP2007176339A (ja) * 2005-12-28 2007-07-12 Nissin Kogyo Co Ltd バーハンドル車両用連動ブレーキ機構
DE102012209521A1 (de) * 2012-06-06 2013-12-12 Robert Bosch Gmbh Simulatorvorrichtung für ein Bremssystem eines Motorrads, Verfahren zum Montieren eines Bremssystems an einem Motorrad und Verfahren zum Abbremsen eines Motorrads

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828640C (de) * 1948-10-22 1952-01-21 Bosch Gmbh Robert Handbremsvorrichtung fuer Kraftfahrzeuge
EP1614600A1 (fr) * 2004-07-07 2006-01-11 ROBERT BOSCH GmbH Dispositif d'actionnement hydraulique de frein de stationnement et procédé de commande d'un tel dispositif
JP2007176339A (ja) * 2005-12-28 2007-07-12 Nissin Kogyo Co Ltd バーハンドル車両用連動ブレーキ機構
DE102012209521A1 (de) * 2012-06-06 2013-12-12 Robert Bosch Gmbh Simulatorvorrichtung für ein Bremssystem eines Motorrads, Verfahren zum Montieren eines Bremssystems an einem Motorrad und Verfahren zum Abbremsen eines Motorrads

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800002765A1 (it) * 2018-02-16 2019-08-16 Piaggio & C Spa Impianto frenante combinato anteriore-posteriore di un motoveicolo e relativo motoveicolo
WO2019159048A1 (fr) * 2018-02-16 2019-08-22 Piaggio & Co. S.P.A. Système de freinage combiné avant/arrière pour un véhicule et véhicule équipé d'un tel système de freinage
EP3599151A1 (fr) * 2018-07-25 2020-01-29 Raicam Driveline S.r.l. Actionneur hydraulique pour système de freinage combiné arrière-avant d'une motocyclette
CN110758626A (zh) * 2018-07-25 2020-02-07 莱卡姆动力传动系统责任有限公司 用于摩托车的组合式后前制动系统的液压致动器
CN110758626B (zh) * 2018-07-25 2022-07-19 莱卡姆动力传动系统责任有限公司 用于摩托车的组合式后前制动系统的液压致动器
IT202000007483A1 (it) * 2020-04-08 2021-10-08 Blubrake S R L Dispositivo attuatore di abs per un sistema idraulico di frenatura di bicicletta
WO2021205337A1 (fr) * 2020-04-08 2021-10-14 Blubrake S.R.L. Dispositif actionneur d'abs pour système de freinage hydraulique de bicyclette
WO2022070091A1 (fr) * 2020-10-02 2022-04-07 C.R.G. S.R.L. Pompe pour systèmes de freinage pour véhicules, en particulier des karts et similaires

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