EP0991554A1 - Chambre de compensation concentrique et maitre-cylindre pour un systeme de freins a disques - Google Patents

Chambre de compensation concentrique et maitre-cylindre pour un systeme de freins a disques

Info

Publication number
EP0991554A1
EP0991554A1 EP99918859A EP99918859A EP0991554A1 EP 0991554 A1 EP0991554 A1 EP 0991554A1 EP 99918859 A EP99918859 A EP 99918859A EP 99918859 A EP99918859 A EP 99918859A EP 0991554 A1 EP0991554 A1 EP 0991554A1
Authority
EP
European Patent Office
Prior art keywords
master cylinder
disc brake
chamber
brake assembly
thermal compensation
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Withdrawn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
EP99918859A
Other languages
German (de)
English (en)
Inventor
William Martin Becker
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.)
Rockshox Inc
Original Assignee
Rockshox Inc
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 Rockshox Inc filed Critical Rockshox Inc
Publication of EP0991554A1 publication Critical patent/EP0991554A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
    • B62L1/00—Brakes; Arrangements thereof
    • 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 disclosed herein relates to design of disc brake systems for use in connection with vehicles.
  • the present invention is particularly suited for use in connection with bicycle disc brake systems .
  • reservoirs used in fluid-based disc brake systems have been made of plastic and have been formed and mounted separately from and/or external to the master cylinder assembly of such disc brake systems .
  • the reservoirs therefore have typically been undesirably exposed and susceptible to being damaged.
  • Typical disc brake systems are also undesirably bulky and therefore less aerodynamic and more unsightly 2 than desirable, due not only to the use of external reservoirs but also to the use in such systems of an unnecessary number of parts .
  • the excess number of parts also results in conventional systems being unnecessarily costly. Accordingly, there is a need for a vehicle disc brake system that is more compact than typical conventional systems, and which may potentially be manufactured at a lower cost due to a reduction and consolidation of parts.
  • a disc brake assembly which is formed with a concentric cylinder that defines concentrically disposed master cylinder chamber and internal thermal compensation chamber .
  • the two chambers are provided with brake fluid for actuating disc brakes, which may be remotely or directly mounted to the subject invention. Additionally, the invention may be actuated through an actuator, such as a brake lever, mounted directly onto the assembly, or remotely through a brake wire.
  • the combination of the concentrically disposed internal thermal compensation chamber and the master cylinder chamber advantageously provide for a compact design which eliminates the need for an external reservoir.
  • a spring-biased compensator piston is disposed within the internal thermal compensation chamber to be pressed into fluid engagement with brake fluid to prevent the creation of an air pocket therein.
  • the disc brake assembly may be oriented in any manner, without an air pocket being formed which requires removal through bleeding.
  • FIG. 1 is a sectional view of a first embodiment of the disc brake assembly of the present invention.
  • FIG. 1A is an enlarged partial sectional view of the first embodiment showing the additional feature of using a screw to control depth of the compensator piston during bleeding.
  • FIG. 2 is a sectional view of the first embodiment of the disc brake assembly of FIG. 1, illustrating the actuation of the assembly's master cylinder.
  • FIG. 3 is a partial sectional view of a second embodiment of the disc brake assembly of the present invention, in which the disc brake assembly is connected to a handlebar mounting boss for actuation by a pushrod attached to a brake lever.
  • the disc brake assembly 10 of the present invention comprises a main unit 12 and an actuator which extends from a remote location, such as a brake lever.
  • the main unit 12 comprises a caliper body 16 and a concentric cylinder 18, which are preferably attached or integrally formed.
  • the caliper body 16 of the disc brake assembly 10 includes two caliper piston bores 20 that house two caliper pistons (not shown) for operation as described, for example, in U.S. Patent No. 5,632,362 to Leitner, issued May 27, 1997 (the "Leitner patent"), the disclosure of which is incorporated herein by reference in its entirety.
  • a cylindrical wall 22 is mounted onto, or as shown in
  • FIGS. 1 and 2 is formed integrally with, the caliper body
  • the cylindrical wall 22, the caliper body 16 and the concentric cylinder 18 can be integrally formed together, thus eliminating the concentric cylinder seals described below.
  • the concentric cylinder 18 has an interior surface 26 and an exterior surface 28.
  • the interior surface 26 defines a master cylinder chamber 30 for receiving a master cylinder piston 32 and a master cylinder spring 34.
  • a master cylinder port 36 extends from the interior surface 26 to define a fluid passage between the master cylinder chamber 30 and one or more caliper piston ports 38 which enable the master cylinder piston 32 to actuate the disc brake.
  • An annular interior surface seal 27 is seated into the interior surface 26 adjacent to the master cylinder port 36.
  • the master cylinder piston 32 is generally 6 tubular shaped with an annular pressure seal 33 and an annular secondary seal 35 being seated on outer portions thereof.
  • the master cylinder spring 34 is disposed between, and preferably connected to, a shoulder 37 formed inside of the master cylinder piston 32 and a flange 39 formed to extend inwardly from the interior surface 26. Accordingly, the master cylinder spring 34 is arranged to urge the master cylinder piston 32 leftward with reference to the figures .
  • a lip 43 may be formed on the interior surface 26 to act as a stop against the master cylinder spring's 34 biasing force.
  • the exterior surface 28 of the concentric cylinder 18 has two portions: a first exterior surface portion 28A and a second exterior surface portion 28B.
  • the first exterior surface portion 28A is preferably formed to define a first diameter D l7 whereas, the second exterior surface portion 28B is preferably formed to define a second diameter D 2 , which is greater than the first diameter D 1 .
  • a generally annular step 41 preferably being planar, is defined.
  • the first exterior surface portion 28A defines an inner surface of an annular-shaped internal thermal compensation chamber 42 that is disposed concentrically about the master cylinder chamber 30.
  • a compensator port 44 and a relief port 46 extend through the first exterior surface portion 28A to communicate the master cylinder chamber 30 with the internal thermal compensation chamber 42.
  • the first exterior surface portion 28A provides an axial guide for an annular compensator piston described below.
  • the second exterior surface portion 28B is disposed to be at least partially disposed in engagement with the cylindrical wall 22 of the caliper body 16 and is 7 preferably provided with a pair of annular concentric cylinder seals 48 seated thereon.
  • the concentric cylinder seals 48 are used to seal the junction of the master cylinder port 36 and the caliper body 16 around the caliper piston port 38.
  • a pressure chamber 45 is located between the interior surface seal 27 and the pressure seal 33
  • a relief chamber 47 is located between the pressure seal 33 and the secondary seal 35.
  • the compensator port 44 is in communication with the pressure chamber 45
  • the relief port 46 is in communication with the relief chamber 47 in an unactuated state of the disc brake assembly 10 with the master cylinder piston 32 being fully seated leftwardly.
  • the concentric cylinder 18 is formed with a cable housing boss 40 at one axial end for connecting to a brake cable housing BCH (shown in FIG.
  • a cap or cover 49 may be mounted onto the other axial end of the concentric cylinder 18 to prevent the ingress of dirt and debris into the disc brake assembly.
  • a volume of brake fluid (shown schematically by dashed lines in the figures) is disposed within the disc brake assembly 10 to cause actuation thereof.
  • sufficient brake fluid must be provided to flood the caliper piston bores 20, the caliper piston port 38, the master cylinder port 36, and the pressure chamber 45. Due to thermal effects, brake fluid expands and contracts.
  • the internal thermal 8 compensation chamber 42 is also flooded with brake fluid which acts as a reservoir.
  • a compensator piston 50 is disposed in the internal thermal compensation chamber 42.
  • the compensator piston 50 is an annular or thru-hole design with annular inner and outer seals 52 and 54, respectively.
  • the inner seal 52 prevents fluid leakage between the inside diameter of the compensator piston 50 and the first exterior surface portion 28A of the concentric cylinder 18.
  • the outer seal 54 prevents fluid leakage between the outside diameter of the compensator piston 50 and the cylindrical wall 22.
  • the compensator piston 50 is biased by a compensator spring 56 on one side and acts upon the internal thermal compensation chamber 42 on the other.
  • the compensator spring 56 is disposed between the compensator piston 50 and a surface such as a disc and/or retaining ring, such as the disc described below, to bias the compensator piston 50 in a direction pushing fluid into the master cylinder chamber 30 through the compensator port 44.
  • the compensator spring 56 is a coil spring disposed to encircle the concentric cylinder 18.
  • the compensator spring 56 is used both to overcome the friction of the inner and outer compensator piston seals 52, 54 and to ensure positive filling of the master cylinder chamber 30 as the brake fluid volume changes.
  • the compensator piston 50 moves axially with respect to the major axis of the concentric cylinder 18 as the brake fluid expands and contracts due to increases and decreases in the temperature of the brake fluid.
  • the compensator piston 50 moves to the right when the brake fluid contracts due to a decrease in ambient air temperatures, and/or when the caliper pistons move out of the caliper body 16 due to brake pad wear.
  • the compensator piston 50 moves to the 9 left due to the thermal expansion of the fluid as a result of an increase in ambient air temperatures, and/or as a result of braking.
  • a stop 58 may be provided to limit the leftward travel of the compensator piston 50.
  • FIGS. 1-2 may be used to fix the concentric cylinder 18 axially to the cylindrical wall 22.
  • the retaining ring 62 preferably are configured to allow for the removal and installation of the compensator piston 50 and the compensator spring 56.
  • the disc brake assembly 10 of the present invention does not require bleeding of the brake system when, for example, the internal thermal compensation chamber 42 is turned upside-down. However, the disc brake assembly 10 still will require bleeding when, for example, the system's brake fluid is changed. When such bleeding is necessary, the compensator piston 50 must be maintained at a specific depth during the bleeding operation. For this purpose, as shown representatively in FIG. 1A, small screws S could be passed through thru-holes 59 in the disc 60, preferably located at evenly-spaced locations in the disc 60, and threaded into threaded holes
  • an internal or external machined feature on the compensator piston 50 such as an undercut, could be used to permit special tools with a hook or flange to control the depth of the compensator piston 50 during the bleeding process .
  • bleed screws 64 shown in FIGS. 1 and 2 are used to conduct the bleeding operation.
  • the two bleed screws 64 of the first embodiment may be removed, and fluid may be pumped into one bleed port 63 using a plastic bottle, flexible hose, or other such implement.
  • the other bleed port 63 may be simultaneously observed to detect the presence of air bubbles until the bubbles have dissipated.
  • one of the two bleed screws 64 may be removed and the disc brake assembly may be bled in a vacuum fluid tank.
  • Other methods of and arrangements for bleeding known to those skilled in the art may be utilized, such as that described below with respect to the second embodiment.
  • the disc brake assembly 10 is initially in an unactuated state as shown in FIG. 1.
  • the disc brake assembly 10 is located in proximity to the disc brake which is controlled.
  • Various modes of actuation may be located remotely therefrom and controlled through various methods known in the prior art.
  • the disc brake assembly 10 is mounted onto the frame of a bicycle adjacent to the tire to be braked, and actuated through a brake cable B which passes through the brake cable housing BCH that is fastened to the cable housing boss 40.
  • the brake cable B is threaded through the flange 29 and connected to the master cylinder piston 32 using any method known to those skilled in the art, such as through mounting to a bar or flange that extends across the inner portion of the master cylinder piston 32.
  • the brake cable B Upon actuation, the brake cable B is caused to be withdrawn from the master cylinder chamber 30, thus applying a pulling force to the master cylinder piston 32 against the biasing force of the master cylinder spring 34.
  • the pulling force of the brake cable B is generated to be 11 greater than the biasing force of the master cylinder spring 34, resulting in movement of the master cylinder piston 32 in a rightward direction relative to the figures.
  • the pressure seal 33 slides with the movement of the master cylinder piston 32 to cause a reduction in volume in the pressure chamber 45. Eventually, the pressure seal 33 passes the compensator port 44 with further reduction in volume in the pressure chamber 45.
  • the master cylinder spring 34 urges the master cylinder piston 32 leftwardly and back into its unactuated position.
  • brake fluid is drawn out of the caliper piston bores 20, thus reducing the pressure therein and allowing for release of the disc brakes .
  • the internal compensation chamber 42 acts as a reservoir for the pressure chamber 45. Under ideal conditions, a fixed volume of brake fluid would be required to actuate the disc brake assembly 10 in a manner as described above. However, losses due to leakage, and thermal effects of expansion and contraction, cause changes in volume of the brake fluid which may result in severe degradation in or altogether a lack of performance. To ensure a sufficient working volume of brake fluid is maintained, the internal thermal compensation chamber 42 feeds additional brake fluid through the compensator port 12
  • the first embodiment of the present invention as illustrated in FIGS. 1 and 2, in which the concentric cylinder 18 of the present invention is integrally mounted to the caliper body 16 of the disc brake assembly 10, is compact and convenient, and therefore ideal for use on pedal driven vehicles such as bicycles.
  • the principles of the present invention may be used in connection with a concentric cylinder 18 housing a lever-actuated master cylinder.
  • a disc brake system is shown in FIG. 3 and is generally designated with the reference numeral 100.
  • the disc brake assembly 100 operates in conjunction with a remote caliper unit (not shown) connected to the assembly 100 by a brake hose H which conducts the brake fluid to the caliper unit.
  • This type of system is particularly useful, for example, in connection with bicycles, motorcycles, snowmobiles and quad-runners .
  • the disc brake assembly 100 is similar to that of FIGS. 1 and 2.
  • the concentric cylinder 18 is housed within a cylindrical wall 68, that is defined by a handlebar mounting boss 70.
  • the handlebar mounting boss 70 is formed with a filler port 72, configured to receive the filler plug 66, and be in communication with the internal thermal compensation chamber 42.
  • the handlebar mounting boss 70 is formed with a delivery port 74 provided to communicate the brake hose H with the 13 pressure chamber 45.
  • a mounting groove or recess is defined in the handlebar mounting boss 76 which is shaped for mounting onto a bicycle handlebar or other location.
  • a modified flange 39A is provided to seal off entirely one axial end of the concentric cylinder 18.
  • a cap 78 is mounted at the other axial end of the concentric cylinder 18 through which passes a pushrod 80.
  • the pushrod 80 is mounted to a brake lever 82 through an articulating connection 84.
  • the brake lever 82 is also pivotally mounted to the handlebar mounting boss 70 through a pivot connection 86.
  • the first and second embodiments are structurally the same.
  • the second embodiment relies on the pushrod 80, through manipulation of the brake lever 82, to depress the master cylinder piston 32 and cause actuation of the disc brake assembly 100 in the same manner as described with respect to the first embodiment. Release of the brake lever 82 causes withdrawal of the pushrod 80 and a return of the disc brake assembly 100 to an unactuated state.
  • the filler plug 66 may be removed and fluid may be pumped through the filler port 72 with a plastic bottle, flexible hose, or other such implement.
  • the delivery port 74 on the remote caliper unit connected to the lever-actuated assembly may be opened and observed while pumping fluid through the filler port 72 to detect the presence of bubbles, until the bubbles have dissipated.
  • the present invention represents an improvement over conventional disc brake assemblies due to 14 use of an internal thermal compensation chamber 42 which replaces and eliminates the external fluid reservoir of such conventional systems.
  • the internal thermal compensation chamber 42 is more compact than typical external fluid reservoir designs due to it being concentric to and integrated with the master cylinder chamber 30.
  • the internal thermal compensation chamber 42 is also less susceptible to damage on open cockpit vehicles such as bicycles, motorcycles, snowmobiles and quad-runners due to the elimination of the external fluid reservoir, which typically is made of plastic.
  • the internal thermal compensation chamber 42 of the present invention is a sealed system.
  • the internal thermal compensation chamber 42 of the present invention therefore does not suffer the drawback of external fluid reservoir systems which, if turned upside- down, risk having air enter the fluid circuit and cause a deterioration or less of brakes.
  • the sealed system of the present invention eliminates the need to bleed the brake system. This feature is particularly useful when the present invention is applied to bicycles, which are frequently turned upside-down.
  • the integrated internal thermal compensation chamber 42 and the master cylinder chamber 30 of the present invention allow for the elimination of the conventional external reservoir tank on a disc brake system.
  • the disc brake assembly 10, 100 of the present invention performs all of the same functions as described, for example, in connection with the disc brake assembly of the Leitner patent, such as providing disc brake fluid to the master cylinder chamber through the compensator port, 15 providing a chamber to accommodate increases in brake fluid volume due to thermal expansion or decreases in brake fluid volume due to thermal contraction, and providing additional disc brake fluid to the master cylinder chamber when necessary due to brake pad wear.
  • the assembly of the present invention can be manufactured at a lower cost due to a reduction and consolidation of parts used in such disc brake assemblies.
  • the use of the concentric cylinder of the present invention also enhances the manufacturing cost savings due to the increase in lathe-turned parts, and the reduction in the complexity and number of machining operations required in connection with a caliper body in comparison to those that would be required in connection with designs such as that described in the Leitner patent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Braking Arrangements (AREA)

Abstract

L'ensemble concerne un ensemble de frein à disque (10; 100) commandé par un système hydraulique avec un liquide de freinage. Une chambre de maître-cylindre (30) est ménagée à l'intérieur d'un cylindre concentrique (18) autour duquel un réservoir de compensation thermique interne (42) est prévu. La chambre de maître-cylindre (30) et le réservoir de compensation thermique interne (42) sont en communication par le fluide pour permettre le passage du liquide de freinage entre eux. Un piston de maître-cylindre (32) est placé en vue de son coulissement dans la chambre de maître-cylindre (30) pour générer une accumulation de pression dans le liquide de freinage et provoquer l'actionnement des freins à disques. Un piston de compensation (50) est placé à l'intérieur du réservoir de compensation thermique interne (42) et est poussé en force par un ressort (56) afin de se mettre en prise avec le liquide de freinage. En assurant une mise en prise continue entre le piston de compensation (50) et le fluide de freinage, il est possible d'éviter la formation de poches d'air dans le liquide de freinage, et de supprimer la nécessité d'un système de purge pour enlever les poches d'air.
EP99918859A 1998-04-28 1999-04-28 Chambre de compensation concentrique et maitre-cylindre pour un systeme de freins a disques Withdrawn EP0991554A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US8327698P 1998-04-28 1998-04-28
US83276P 1998-04-28
PCT/US1999/009127 WO1999055567A1 (fr) 1998-04-28 1999-04-28 Chambre de compensation concentrique et maitre-cylindre pour un systeme de freins a disques

Publications (1)

Publication Number Publication Date
EP0991554A1 true EP0991554A1 (fr) 2000-04-12

Family

ID=22177296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99918859A Withdrawn EP0991554A1 (fr) 1998-04-28 1999-04-28 Chambre de compensation concentrique et maitre-cylindre pour un systeme de freins a disques

Country Status (5)

Country Link
EP (1) EP0991554A1 (fr)
JP (1) JP2002506408A (fr)
AU (1) AU3667599A (fr)
CA (1) CA2295130A1 (fr)
WO (1) WO1999055567A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003070552A1 (fr) * 2002-02-20 2003-08-28 Brakes India Limited Systeme de freinage integre pour deux roues
US7377367B2 (en) 2005-02-18 2008-05-27 Shimano Inc. Hydraulic disc brake lever assembly
US7308791B2 (en) * 2005-02-18 2007-12-18 Shimano Inc. Hydraulic disc brake lever assembly
JP2007069638A (ja) * 2005-09-05 2007-03-22 Yamaha Motor Co Ltd 油圧マスタシリンダ
US7500545B2 (en) * 2005-12-13 2009-03-10 Shimano, Inc. Reservoir apparatus for a bicycle brake lever device
DE102006040328A1 (de) * 2006-08-29 2008-03-06 Gustav Magenwirth Gmbh & Co. Kg Bremssystem mit einer hydraulischen Bremsanlage
US7938234B2 (en) * 2007-07-02 2011-05-10 Shimano Inc. Multi-position brake lever system with a converter that converts a cable actuator to a hydraulic actuator
DE102011078153A1 (de) * 2011-06-27 2012-12-27 Gustav Magenwirth Gmbh & Co. Kg Hydraulikkonverter und hydraulische Bremse
IT201900012996A1 (it) * 2019-07-26 2021-01-26 High Tech Bca Performance S R L Dispositivo di azionamento idraulico per un fluido di un sistema idraulico di un ciclo o di un motociclo.
IT202100028463A1 (it) * 2021-11-09 2023-05-09 Sunstar Eng Europe Gmbh Pompa di azionamento idraulico per un ciclo o un motociclo.

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Publication number Priority date Publication date Assignee Title
US3729169A (en) * 1969-06-10 1973-04-24 Bendix Corp Adaptive braking system with hydraulically powered modulator
JPS57186563A (en) * 1981-05-13 1982-11-17 Honda Motor Co Ltd Interlocking brake device for motorcycle
US4834221A (en) * 1986-12-04 1989-05-30 Honda Giken Kogyo Kabushiki Kaisha Wheel angular acceleration sensor for anti-lock controller for vehicles
GB2236819B (en) * 1989-09-14 1993-07-14 Gen Motors France Dual master cylinder
US5372408A (en) * 1992-03-06 1994-12-13 Honda Giken Kogyo Kabushiki Kaisha Motorcycle brake system having dual master cylinder proportioning
JP3605423B2 (ja) * 1994-06-14 2004-12-22 本田技研工業株式会社 自動二輪車用制動装置
US5632362A (en) * 1995-08-15 1997-05-27 Rockshox, Inc. Bicycle disc brake

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Title
See references of WO9955567A1 *

Also Published As

Publication number Publication date
WO1999055567A1 (fr) 1999-11-04
AU3667599A (en) 1999-11-16
JP2002506408A (ja) 2002-02-26
CA2295130A1 (fr) 1999-11-04

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