WO2007111510A1 - Hydraulic brake-system for a bicycle - Google Patents

Hydraulic brake-system for a bicycle Download PDF

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Publication number
WO2007111510A1
WO2007111510A1 PCT/NL2007/050130 NL2007050130W WO2007111510A1 WO 2007111510 A1 WO2007111510 A1 WO 2007111510A1 NL 2007050130 W NL2007050130 W NL 2007050130W WO 2007111510 A1 WO2007111510 A1 WO 2007111510A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
chamber
piston
rod
spring
Prior art date
Application number
PCT/NL2007/050130
Other languages
French (fr)
Inventor
Jan Van Frankenhuyzen
Original Assignee
Technische Universiteit Delft
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 Technische Universiteit Delft filed Critical Technische Universiteit Delft
Publication of WO2007111510A1 publication Critical patent/WO2007111510A1/en

Links

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
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/224—Master control, e.g. master cylinders with pressure-varying means, e.g. with two stage operation provided by use of different piston diameters including continuous variation from one diameter to another
    • 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
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/12—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic the transmitted force being varied therein
    • 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
    • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02—Application and release valves
    • B60T15/36—Other control devices or valves characterised by definite functions
    • B60T15/38—Other control devices or valves characterised by definite functions for quick take-up and heavy braking, e.g. with auxiliary reservoir for taking-up slack
    • 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 hydraulic brake system for a bicycle which may or may not be provided with an auxiliary motor, comprising a brake disc and brake claws cooperating with the brake disc, as well as fluid-containing channels that extend between an operating organ and the brake claws, and which system further possesses a spring-loaded piston accommodated and moveable in a first chamber.
  • a drawback of the known hydraulic brake system is that the brake claws have to be mounted very precisely in relation to the brake disc, because the known system is only capable of delivering a limited stroke. In the state of rest therefore, the brake claws need to be almost in contact with the brake disc. In practice this results in the brakes con- tacting during cycling and, as a result of wear, there is a continuous need to readjust the brake claws.
  • Another drawback is that the precise adjustment has to be repeated when changing the wheels .
  • the American patent ⁇ S-A-3, 630, 027 discloses a hy- draulic brake system wherein fluid-containing channels extend between an operating organ and brake provisions, in which a spring-loaded piston is accommodated in a first chamber and in which the piston is provided with a rod fixed to the piston, which rod is provided on the spring-loaded side of the piston, and whose cross-sectional diameter is smaller than that of the piston, and which rod reaches from the first chamber into a second chamber.
  • This known hydraulic brake system possesses a further valve which, when the exerted brake pressure increases opens, allowing free passage through a fluid channel, whereby an increased brake pressure can be exerted.
  • the hydraulic brake system is characterized in that both the first chamber and the second chamber are in communication with a first liq- uid-containing channel, which is coupled to the operating organ, and in that a second liquid-containing channel couples the second chamber with the brake claws, and the second chamber is provided with a seal between the first liquid- containing channel and the second liquid-containing channel, which becomes effective by moving the piston with the rod fixed thereon.
  • the brake system allows the piston initially to maintain a stationary position in the first chamber, because the spring in the spring-loaded piston and the pressure exerted on a surface of the rod in the second chamber will compensate at least a pressure exerted on the piston in the first chamber. Simultaneously, the pressure exerted by the operating organ via the second chamber causes the brake claws to be moved until they abut to the brake disc.
  • the pressure in the first cham- ber and the second chamber may increase further to a level where the pressure exerted on the piston is greater than the spring load on the piston and the pressure exerted on the rod together.
  • the piston with the rod fixed thereon moves, causing the rod to be moved further into the second chamber, and allowing said seal between the first fluid-containing channel and the second fluid- containing channel to become effective.
  • seal it is possible to use, for example, a quad-ring or a lip-seal.
  • the same is formed by the assembly of the rod and an O-ring provided in the second chamber.
  • a further aspect of the hydraulic brake system according to the invention is that the spring of the spring- loaded piston has a predetermined spring characteristic for determining a brake force necessary to be exerted with the operating organ to render the brake claws effective.
  • FIG. 1 A single figure in the drawing shows a hydraulic circuit diagram, according to which the hydraulic brake system of the invention may be embodied.
  • the figure shows an operating organ in the form of a brake handle 1, which is functionally coupled with a brake cylinder 2 comprising a piston 3 having a functional surface Ab.
  • This piston is spring-loaded with a spring having a spring stiffness C b and this causes the piston 3, in a state of rest, to assume a neutral position.
  • a first fluid-containing channel 4 the brake piston 2 is coupled with a brake capacity amplifier 5, whose function will be explained in more detail below.
  • a second fluid-containing channel 6 extends to a set of brake claws 7, between which a brake disc 8 is provided.
  • the brake claws 7 are preferably spring- loaded by means of a spring having a spring stiffness Cr in order to place said brake claws 7 into a preferential posi- tion in which they clear the brake discs 8.
  • the crux of the invention lies in the brake capacity amplifier 5 and the manner in which the same is operationally connected with and coupled between the first fluid-containing channel 4 and the second fluid-containing channel 6.
  • the brake-capacity amplifier 5 comprises a spring- loaded piston 11 accommodated and moveable in a first chamber 10. On said piston 11 a rod 12 is fixed, on the spring-loaded side of the piston 11. This is represented in the figure by showing the rod 12 on the same side as the spring 13. The figure further clearly shows that in cross section, the diameter of the rod 12 is smaller than that of the piston 11, and that the rod 12 extends from the first chamber 10 into a second chamber 14. Both the first chamber 10 and the second chamber 14 are in communication with the first fluid-containing channel 4, which is coupled with the operating organ 1.
  • the coupling to the brake claws 7 is provided by the fact that the second fluid-containing channel 6 couples the second chamber 14 with the brake claws 7. It is further of importance that the second chamber 14 is provided with a seal 12, 15 between the first fluid- containing channel 4 and the second fluid-containing channel 6, which is actuated only after the brake claws 7 have been moved up against the brake disc 8. This is achieved by oper- ating the brake handle 1, a first consequence of which is that via the second chamber 14 and the second fluid- containing channel 6, the oil in the first fluid-containing channel 4 moves the brake claws 7 until they abut against the brake disc 8.
  • the brake pressure exerted in the second chamber 14 upon the functional surface A v of the rod 12, and consequently on the piston 11, together with the force exerted by the spring 13 on the piston 11, is at this instance still greater than the same brake pressure exerted by the oil in the first chamber 10 on the functional surface A k of the piston 11 located at the other side.
  • the ratio between the functional surface A k of the piston 11 and the functional surface A v of the rod 12 determines the degree of pressure increase between the first fluid-containing channel 4 and the second fluid-containing channel 6. This causes the brake claws 7 to be pressed against the brake disc 8 more forcefully.
  • the ratio between the brake pressure exerted by the brake claws 7 on the brake disc 8 and the pressure exerted by means of the brake handle 1 is therefore A k /A v .
  • the seal provided in the second chamber 14 between the first fluid-containing channel 4 and the second fluid-containing channel 6 does not necessarily have to be an O-ring 15 but that it is also possible to use, for example, a quad-ring or a lip seal.

Landscapes

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

Abstract

The invention relates to a hydraulic brake system for a bicycle which may or may not be provided with an auxiliary motor, comprising a brake disc and brake claws cooperating with the brake disc, as well as fluid-containing channels (4,6) that extend between an operating organ (1) and the brake claws, and which system further possesses a spring-loaded pistion (11) accommodated and moveable in a first chamber (13).

Description

Hydraulic brake* system for a bicycle
The invention relates to a hydraulic brake system for a bicycle which may or may not be provided with an auxiliary motor, comprising a brake disc and brake claws cooperating with the brake disc, as well as fluid-containing channels that extend between an operating organ and the brake claws, and which system further possesses a spring-loaded piston accommodated and moveable in a first chamber.
Such a hydraulic brake system is known from the American patent specification US-B-6, 435,318. In the known hydraulic brake system the spring- loaded piston serves to prevent the brake from jamming when abruptly engaging the brake, which could cause the cyclist to go over the handlebars .
A drawback of the known hydraulic brake system is that the brake claws have to be mounted very precisely in relation to the brake disc, because the known system is only capable of delivering a limited stroke. In the state of rest therefore, the brake claws need to be almost in contact with the brake disc. In practice this results in the brakes con- tacting during cycling and, as a result of wear, there is a continuous need to readjust the brake claws. Another drawback is that the precise adjustment has to be repeated when changing the wheels .
The American patent ϋS-A-3, 630, 027 discloses a hy- draulic brake system wherein fluid-containing channels extend between an operating organ and brake provisions, in which a spring-loaded piston is accommodated in a first chamber and in which the piston is provided with a rod fixed to the piston, which rod is provided on the spring-loaded side of the piston, and whose cross-sectional diameter is smaller than that of the piston, and which rod reaches from the first chamber into a second chamber.
This known hydraulic brake system possesses a further valve which, when the exerted brake pressure increases opens, allowing free passage through a fluid channel, whereby an increased brake pressure can be exerted.
However, the American patent US-A-3, 630, 027 offers no solution for the above-mentioned adjustment problem inher- ent to the brake system disclosed in US-B-6, 435,318.
It is an object of the invention to improve the known hydraulic brake system so as to make it possible to carry out the adjustment with greater tolerances.
To this end the hydraulic brake system according to the invention is characterized by one or several of the appended claims .
In a first aspect of the invention, the hydraulic brake system is characterized in that both the first chamber and the second chamber are in communication with a first liq- uid-containing channel, which is coupled to the operating organ, and in that a second liquid-containing channel couples the second chamber with the brake claws, and the second chamber is provided with a seal between the first liquid- containing channel and the second liquid-containing channel, which becomes effective by moving the piston with the rod fixed thereon.
When the pressure in the first liquid-containing channel increases due to the operating organ being operated, the brake system according to the invention allows the piston initially to maintain a stationary position in the first chamber, because the spring in the spring-loaded piston and the pressure exerted on a surface of the rod in the second chamber will compensate at least a pressure exerted on the piston in the first chamber. Simultaneously, the pressure exerted by the operating organ via the second chamber causes the brake claws to be moved until they abut to the brake disc.
Through further pressure increase as a result of operating the operating organ, the pressure in the first cham- ber and the second chamber may increase further to a level where the pressure exerted on the piston is greater than the spring load on the piston and the pressure exerted on the rod together. As soon as this is the case, the piston with the rod fixed thereon moves, causing the rod to be moved further into the second chamber, and allowing said seal between the first fluid-containing channel and the second fluid- containing channel to become effective. As seal it is possible to use, for example, a quad-ring or a lip-seal. In a sim- pie embodiment of the seal, the same is formed by the assembly of the rod and an O-ring provided in the second chamber. Moving the rod inserts it with a tight fit into the O-ring so that together they form a seal between the first fluid- containing channel in communication with the second chamber and the second fluid-containing channel. Further operation of the operating organ subsequently ensures that the pressure thus applied in the first fluid-containing channel and the first chamber is exerted via the piston and the rod on the fluid in the second fluid-containing channel, wherein the re- spective diameters of the piston and the rod are predetermined subject to a desired increase in brake capacity between the operating organ and the brake claws.
A further aspect of the hydraulic brake system according to the invention is that the spring of the spring- loaded piston has a predetermined spring characteristic for determining a brake force necessary to be exerted with the operating organ to render the brake claws effective.
Hereinafter the invention will be further elucidated by way of the drawing and an exemplary embodiment of the hy- draulic brake system according to the invention, without limiting the patent claims .
A single figure in the drawing shows a hydraulic circuit diagram, according to which the hydraulic brake system of the invention may be embodied. The figure shows an operating organ in the form of a brake handle 1, which is functionally coupled with a brake cylinder 2 comprising a piston 3 having a functional surface Ab. This piston is spring-loaded with a spring having a spring stiffness Cb and this causes the piston 3, in a state of rest, to assume a neutral position.
Via a first fluid-containing channel 4 the brake piston 2 is coupled with a brake capacity amplifier 5, whose function will be explained in more detail below. From the brake capacity amplifier 5, a second fluid-containing channel 6 extends to a set of brake claws 7, between which a brake disc 8 is provided. The brake claws 7 are preferably spring- loaded by means of a spring having a spring stiffness Cr in order to place said brake claws 7 into a preferential posi- tion in which they clear the brake discs 8.
The crux of the invention lies in the brake capacity amplifier 5 and the manner in which the same is operationally connected with and coupled between the first fluid-containing channel 4 and the second fluid-containing channel 6. The brake-capacity amplifier 5 comprises a spring- loaded piston 11 accommodated and moveable in a first chamber 10. On said piston 11 a rod 12 is fixed, on the spring-loaded side of the piston 11. This is represented in the figure by showing the rod 12 on the same side as the spring 13. The figure further clearly shows that in cross section, the diameter of the rod 12 is smaller than that of the piston 11, and that the rod 12 extends from the first chamber 10 into a second chamber 14. Both the first chamber 10 and the second chamber 14 are in communication with the first fluid-containing channel 4, which is coupled with the operating organ 1.
The coupling to the brake claws 7 is provided by the fact that the second fluid-containing channel 6 couples the second chamber 14 with the brake claws 7. It is further of importance that the second chamber 14 is provided with a seal 12, 15 between the first fluid- containing channel 4 and the second fluid-containing channel 6, which is actuated only after the brake claws 7 have been moved up against the brake disc 8. This is achieved by oper- ating the brake handle 1, a first consequence of which is that via the second chamber 14 and the second fluid- containing channel 6, the oil in the first fluid-containing channel 4 moves the brake claws 7 until they abut against the brake disc 8. At this stage, the brake pressure exerted in the second chamber 14 upon the functional surface Av of the rod 12, and consequently on the piston 11, together with the force exerted by the spring 13 on the piston 11, is at this instance still greater than the same brake pressure exerted by the oil in the first chamber 10 on the functional surface Ak of the piston 11 located at the other side.
As soon as the point is reached where the brake claws 7 abut against the brake disc 8/ a further movement of the brake handle 1 causes the pressure in the first fluid- containing channel 4 to increase, so that the pressure upon the functional surface Ak of the piston 11 increases and, at a predetermined value, exceeds the spring load 13 on the piston 11 and the brake pressure in the second chamber 14 on the functional surface Av of the rod 12. At that point the piston 11 and the rod 12 fixed thereon move counter to the pressure of the spring 13, pushing the rod 12 further into the chamber 14 and into engagement with an 0-ring 15. The rod 12 and the 0-ring 15 together form a seal 12, 15 between the first fluid-containing channel 4 and the second fluid-containing channel 6. A subsequent further operation of the brake handle 1 causing a further increase of the pressure in the first fluid-containing channel 4, results in a corresponding pressure exertion on the functional surface Ak of the piston 11, and a corresponding pressure exertion via the rod 12 coupled with the piston 11 on the oil in the second fluid-containing channel 6. The ratio between the functional surface Ak of the piston 11 and the functional surface Av of the rod 12 determines the degree of pressure increase between the first fluid-containing channel 4 and the second fluid-containing channel 6. This causes the brake claws 7 to be pressed against the brake disc 8 more forcefully. The ratio between the brake pressure exerted by the brake claws 7 on the brake disc 8 and the pressure exerted by means of the brake handle 1 is therefore Ak/Av.
For the sake of completeness it should be noted that the seal provided in the second chamber 14 between the first fluid-containing channel 4 and the second fluid-containing channel 6 does not necessarily have to be an O-ring 15 but that it is also possible to use, for example, a quad-ring or a lip seal.

Claims

CIAIMS
1. A hydraulic brake system for a bicycle which may or may not be provided with an auxiliary motor, comprising a brake disc (8) and brake claws (7) cooperating with the brake disc, as well as fluid-containing channels (4, 6) that extend between an operating organ (1) and the brake claws (7), and which system further possesses a spring-loaded piston accommodated and moveable in a first chamber (10), in which the piston (11) is provided with a rod (12) fixed to the piston, which rod (12) is provided on the spring-loaded side of the piston (11), and whose cross-sectional diameter is smaller than that of the piston, and which rod (12) reaches from the first chamber (10) into a second chamber (14), characterized. in that both the first chamber (10) and the second chamber (14) are in communication with a first liquid-containing channel (4), which is coupled to the operating organ (1), and in that a second liquid-containing channel (6) couples the second chamber (14) with the brake claws (7), and the second chamber (14) is provided with a seal (12, 15) between the first liquid-containing channel (4) and the second liquid- containing channel (6), which becomes effective by moving the piston (11) with the rod fixed thereon (12) .
2. A hydraulic brake system according to claim 1, characterized in that the seal (12, 15) is formed by the assembly of the rod (12) and an O-ring (15) provided in the second chamber (14) .
3. A hydraulic brake system according to claim 1 or 2, characterized in that the respective diameters of the piston (11) and the rod (12) are predetermined subject to a desired increase in brake capacity between the operating or- gan (1) and the brake claws (7) .
4. A hydraulic brake system according to one of the claims 1-3, characterized in that the spring of the spring- loaded piston (11) has a predetermined spring characteristic for determining a brake force necessary to be exerted with the operating organ (1) to render the brake claws effective (7).
PCT/NL2007/050130 2006-03-27 2007-03-27 Hydraulic brake-system for a bicycle WO2007111510A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1031449 2006-03-27
NL1031449A NL1031449C2 (en) 2006-03-27 2006-03-27 Hydraulic brake system for a bicycle.

Publications (1)

Publication Number Publication Date
WO2007111510A1 true WO2007111510A1 (en) 2007-10-04

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ID=37301774

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2007/050130 WO2007111510A1 (en) 2006-03-27 2007-03-27 Hydraulic brake-system for a bicycle

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NL (1) NL1031449C2 (en)
WO (1) WO2007111510A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20090254A1 (en) * 2009-12-04 2011-06-05 Formula Srl ADJUSTMENT DEVICE FOR THE VACUUM STROKE IN HYDRAULIC BRAKES OF BICYCLES AND MOTORCYCLES
EP3162646A1 (en) * 2015-10-14 2017-05-03 Robert Bosch Gmbh Braking system, method of operating a braking system and vehicle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642720A (en) * 1950-02-21 1953-06-23 Bendix Aviat Corp Compound master cylinder unit for hydraulic systems
US3630027A (en) 1969-08-18 1971-12-28 Andrew A Lambert Hydraulic linear amplifier apparatus for power brake structures
WO1981001692A1 (en) * 1979-12-07 1981-06-25 Valmet Oy Pressure converter for hydraulic brakes,particularly for tractors
US6435318B1 (en) 2001-05-07 2002-08-20 Giant Manufacturing Co., Ltd. Two-stage bicycle disk brake assembly with an anti-lock device
US20020162715A1 (en) * 2001-05-01 2002-11-07 Delphi Technologies, Inc. Manual braking system with hydraulic brake booster

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642720A (en) * 1950-02-21 1953-06-23 Bendix Aviat Corp Compound master cylinder unit for hydraulic systems
US3630027A (en) 1969-08-18 1971-12-28 Andrew A Lambert Hydraulic linear amplifier apparatus for power brake structures
WO1981001692A1 (en) * 1979-12-07 1981-06-25 Valmet Oy Pressure converter for hydraulic brakes,particularly for tractors
US20020162715A1 (en) * 2001-05-01 2002-11-07 Delphi Technologies, Inc. Manual braking system with hydraulic brake booster
US6435318B1 (en) 2001-05-07 2002-08-20 Giant Manufacturing Co., Ltd. Two-stage bicycle disk brake assembly with an anti-lock device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20090254A1 (en) * 2009-12-04 2011-06-05 Formula Srl ADJUSTMENT DEVICE FOR THE VACUUM STROKE IN HYDRAULIC BRAKES OF BICYCLES AND MOTORCYCLES
US20110135521A1 (en) * 2009-12-04 2011-06-09 Giancarlo Vezzoli Device for adjusting the free stroke in hydraulic brakes of bicycles or motorcycles
EP2338778A1 (en) * 2009-12-04 2011-06-29 Formula S.r.l. Device for adjusting the free stroke in hydraulic brakes
US8613346B2 (en) * 2009-12-04 2013-12-24 Formula S.R.L. Device for adjusting the free stroke in hydraulic brakes of bicycles or motorcycles
EP3162646A1 (en) * 2015-10-14 2017-05-03 Robert Bosch Gmbh Braking system, method of operating a braking system and vehicle

Also Published As

Publication number Publication date
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