GB2076087A - Dual Disc Brake Mechanism - Google Patents

Dual Disc Brake Mechanism Download PDF

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Publication number
GB2076087A
GB2076087A GB8015723A GB8015723A GB2076087A GB 2076087 A GB2076087 A GB 2076087A GB 8015723 A GB8015723 A GB 8015723A GB 8015723 A GB8015723 A GB 8015723A GB 2076087 A GB2076087 A GB 2076087A
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GB
United Kingdom
Prior art keywords
disc
discs
brake
pad
braking
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.)
Granted
Application number
GB8015723A
Other versions
GB2076087B (en
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.)
SIMMONS ROBERT MILLER
Original Assignee
SIMMONS ROBERT MILLER
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 SIMMONS ROBERT MILLER filed Critical SIMMONS ROBERT MILLER
Priority to GB8015723A priority Critical patent/GB2076087B/en
Publication of GB2076087A publication Critical patent/GB2076087A/en
Application granted granted Critical
Publication of GB2076087B publication Critical patent/GB2076087B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/24—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
    • F16D55/26—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member without self-tightening action
    • F16D55/36—Brakes with a plurality of rotating discs all lying side by side
    • F16D55/40—Brakes with a plurality of rotating discs all lying side by side actuated by a fluid-pressure device arranged in or one the brake
    • 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
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/065—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing disc
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D65/84—Features relating to cooling for disc brakes
    • F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0062—Partly lined, i.e. braking surface extending over only a part of the disc circumference

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

Abstract

The brake mechanism comprises two discs mounted closely together, to rotate with a wheel and to slide axially on studs; a caliper includes a single piston (operable hydraulically, pneumatically or mechanically) and three pads providing four pad surfaces for acting one on each of the four braking surfaces provided by the discs. The central pad floats, and determines the separation of the discs, which discs have ventilation holes. <IMAGE>

Description

SPECIFICATION Safer Dual Disc Brake Mechanism Technical Field Motor vehicle engineering; motor vehicle and motorcycle braking systems.
Background Original disc brake mechanism developed for motor vehicles by Dunlop. Now manufactured world wide and fitted as standard equipment on most modern motor cars and motorcycles. In the conventional disc brake mechanism, a steel disc, fixed to the rotating wheel is acted upon by two brake pads, one on each side of the disc. These pads are actuated by hydraulically (or pneumatically) operated pistons mounted on a caliper, one piston pushing one pad. Alternatively, a single actuating piston may be used, with some mechanism for centering the braking effort, such as a floating, or self-aligning disc, or a pivoting mount for the caliper itself.
In conventional disc brakes the effectiveness of the brakes can only be improved by increasing the area over which the pads are swept. This can be achieved by enlarging the disc, together with the caliper, or, on motorcycles, two discs can be fitted, one on each side of the wheel, each with its actuating caliper mechanism. This leads to an increase in unsprung weight, which reduces the effectiveness of the vehicle suspension system.
In addition disc brakes are subject to disconcerting delays in operation in wet weather because of water which accrues on the discs owing to their exposed location. Much is flung off by centrifugal action, but a thin film remains which has to be wiped by the brake pads before any effective braking action can commence.
The Invention The basic construction is a dual disc, both discs being mounted close together and operated upon by a single acting caliper, containing one piston and three brake pads with four braking surfaces.
The dual discs are self aligning, being retained on the rotating wheel by six or more steel studs passing through locating holes near the centre of the disc. The discs are free to slide axially (i.e.
along the axis of rotation of the wheel) and are prevented from moving beyond the ends of the studs by pins in the ends of the studs. The discs are ventiiated, that is there are large holes near the central region of the disc to admit air for cooling purposes. The separation of the discs is dependant on the thickness of the central pad and is in the range six (6) to ten (10) millimetres. In operation, the hydraulic pressure (or mechanical or pneumatic pressure) actuates the piston in the cal per, pushing the pad into contact with the outer surface of the outer disc. This disc is forced to float along the studs until its inner surface contacts the outer braking surface of the centre brake pad. This pad itself is also floating or selfaligning, so when pushed by the disc, it moves across until its inner pad contacts the inner disc.
This disc in turn floats sideways along the studs until its inner surface contacts the last, fixed brake pad. When all four brake pad/disc surfaces are in contact, braking action commences. The selfaligning nature of the discs and the central brake pad equalises the braking effort on the two discs.
The advantages of this invention are as follows: a) Twice the braking area swept by the pads, with only a small increase in unsprung weight, namely the weight of one steel disc and the centre floating brake pad.
b) No extra hydraulic actuating mechanism is required.
c) The narrow aperture between the discs shields the inner surfaces from much of the water thrown up from the road. In addition the two discs, rotating in close proximity, act like the impeller of a centrifual pump, throwing anything between the discs outwards; air is drawn in at the centre of the discs through the ventilation holes, so that the inner surfaces are kept clear.
Applications The invention enables an improvement, by a factor of two, in the swept area of disc brakes.
This gives better, safer braking. The invention could be applied to many of the presently manufactured disc brake systems with very little increase in cost or complexity, by modifying the caliper to take the central, floating brake pad, and by the addition of an extra floating disc on the wheel. The inner surfaces of the dual disc brake mechanism are better shielded from water than existing disc brake systems.
Claims
1. A disc brake comprising a pair of discs mounted close together and having an associated single caliper arrangement, the caliper arrangement including a single piston and providing four brake pad surfaces for acting one on each of the four braking surfaces provided by the disc, the discs being adapted to be mounted at the axis of the wheel to which the disc-brake is to be applied, so that at least one is capable of sliding movement along the rotational axis of the wheel.
2. A disc-brake according to Claim 1, wherein the discs are both slidably mounted on a plurality of shafts which are arranged parallel to each other and which are adapted to be rotationally fixed at the axis of the wheel to which the disc brake is to be applied.
3. A disc brake according to Claim 1 or 2, wherein the two pad surfaces for the mutually inwardly directed braking surfaces of the discs are provided by opposed ends of a single, central brake pad which is mounted on the caliper so as to be capable of floating, the arrangement being such that the piston of the caliper is actuated to push one adjacent outer pad into contact with the outer braking surface of one disc, thereby causing this disc to float along said shafts until its inner braking surface contacts one pad surface of the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Safer Dual Disc Brake Mechanism Technical Field Motor vehicle engineering; motor vehicle and motorcycle braking systems. Background Original disc brake mechanism developed for motor vehicles by Dunlop. Now manufactured world wide and fitted as standard equipment on most modern motor cars and motorcycles. In the conventional disc brake mechanism, a steel disc, fixed to the rotating wheel is acted upon by two brake pads, one on each side of the disc. These pads are actuated by hydraulically (or pneumatically) operated pistons mounted on a caliper, one piston pushing one pad. Alternatively, a single actuating piston may be used, with some mechanism for centering the braking effort, such as a floating, or self-aligning disc, or a pivoting mount for the caliper itself. In conventional disc brakes the effectiveness of the brakes can only be improved by increasing the area over which the pads are swept. This can be achieved by enlarging the disc, together with the caliper, or, on motorcycles, two discs can be fitted, one on each side of the wheel, each with its actuating caliper mechanism. This leads to an increase in unsprung weight, which reduces the effectiveness of the vehicle suspension system. In addition disc brakes are subject to disconcerting delays in operation in wet weather because of water which accrues on the discs owing to their exposed location. Much is flung off by centrifugal action, but a thin film remains which has to be wiped by the brake pads before any effective braking action can commence. The Invention The basic construction is a dual disc, both discs being mounted close together and operated upon by a single acting caliper, containing one piston and three brake pads with four braking surfaces. The dual discs are self aligning, being retained on the rotating wheel by six or more steel studs passing through locating holes near the centre of the disc. The discs are free to slide axially (i.e. along the axis of rotation of the wheel) and are prevented from moving beyond the ends of the studs by pins in the ends of the studs. The discs are ventiiated, that is there are large holes near the central region of the disc to admit air for cooling purposes. The separation of the discs is dependant on the thickness of the central pad and is in the range six (6) to ten (10) millimetres. In operation, the hydraulic pressure (or mechanical or pneumatic pressure) actuates the piston in the cal per, pushing the pad into contact with the outer surface of the outer disc. This disc is forced to float along the studs until its inner surface contacts the outer braking surface of the centre brake pad. This pad itself is also floating or selfaligning, so when pushed by the disc, it moves across until its inner pad contacts the inner disc. This disc in turn floats sideways along the studs until its inner surface contacts the last, fixed brake pad. When all four brake pad/disc surfaces are in contact, braking action commences. The selfaligning nature of the discs and the central brake pad equalises the braking effort on the two discs. The advantages of this invention are as follows: a) Twice the braking area swept by the pads, with only a small increase in unsprung weight, namely the weight of one steel disc and the centre floating brake pad. b) No extra hydraulic actuating mechanism is required. c) The narrow aperture between the discs shields the inner surfaces from much of the water thrown up from the road. In addition the two discs, rotating in close proximity, act like the impeller of a centrifual pump, throwing anything between the discs outwards; air is drawn in at the centre of the discs through the ventilation holes, so that the inner surfaces are kept clear. Applications The invention enables an improvement, by a factor of two, in the swept area of disc brakes. This gives better, safer braking. The invention could be applied to many of the presently manufactured disc brake systems with very little increase in cost or complexity, by modifying the caliper to take the central, floating brake pad, and by the addition of an extra floating disc on the wheel. The inner surfaces of the dual disc brake mechanism are better shielded from water than existing disc brake systems. Claims
1. A disc brake comprising a pair of discs mounted close together and having an associated single caliper arrangement, the caliper arrangement including a single piston and providing four brake pad surfaces for acting one on each of the four braking surfaces provided by the disc, the discs being adapted to be mounted at the axis of the wheel to which the disc-brake is to be applied, so that at least one is capable of sliding movement along the rotational axis of the wheel.
2. A disc-brake according to Claim 1, wherein the discs are both slidably mounted on a plurality of shafts which are arranged parallel to each other and which are adapted to be rotationally fixed at the axis of the wheel to which the disc brake is to be applied.
3. A disc brake according to Claim 1 or 2, wherein the two pad surfaces for the mutually inwardly directed braking surfaces of the discs are provided by opposed ends of a single, central brake pad which is mounted on the caliper so as to be capable of floating, the arrangement being such that the piston of the caliper is actuated to push one adjacent outer pad into contact with the outer braking surface of one disc, thereby causing this disc to float along said shafts until its inner braking surface contacts one pad surface of the centre brake pad, this in turn being caused to float or self-align, so that its other pad surface moves into contact with the inner braking surface of the other disc, which disc in turn floats along the shaft until its outer braking surface contacts the other outer, fixed, brake pad.
4. A disc brake according to Claim 3 wherein the spacing of the discs which is determined by the thickness of the central brake pad is in the range six (6) to ten (10) millimetres.
5. A disc brake according to any one of Claims 1 to 4, wherein the discs have apertures in their central region so as, in use, to permit cooling air flow.
6. A disc brake constructed, arranged, and adapted for use substantially as hereinbefore described with reference to the accompanying drawing.
GB8015723A 1980-05-13 1980-05-13 Dual disc brake mechanism Expired GB2076087B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8015723A GB2076087B (en) 1980-05-13 1980-05-13 Dual disc brake mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8015723A GB2076087B (en) 1980-05-13 1980-05-13 Dual disc brake mechanism

Publications (2)

Publication Number Publication Date
GB2076087A true GB2076087A (en) 1981-11-25
GB2076087B GB2076087B (en) 1984-09-12

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164712A (en) * 1984-09-21 1986-03-26 Automotive Products Plc Caliper disc brake
EP0810135A1 (en) * 1996-04-11 1997-12-03 SAME S.p.A. Drive axle for agricultural harvesting machine
WO2000009901A1 (en) 1998-08-15 2000-02-24 Federal-Mogul Technology Limited Disc brake pad assembly
EP0994269A2 (en) 1998-10-14 2000-04-19 Shimano Inc. Disk brake assembly
US6223863B1 (en) 1996-12-12 2001-05-01 Federal-Mogul Technology Limited Disc brake suspension for improved turning circle
US6244391B1 (en) 1996-12-12 2001-06-12 Federal-Mogul Technology Limited Disc brake system with ABS
US6247560B1 (en) 1996-12-12 2001-06-19 Federal-Mogul Technology Limited Slidable brake disc system
US6334514B1 (en) 2000-02-02 2002-01-01 Shimano Inc. Bicycle disc brake
US6349800B1 (en) 2000-02-07 2002-02-26 Shimano Inc. Bicycle disc brake assembly
US6352314B1 (en) 2000-01-31 2002-03-05 Shimano Inc. Bicycle hub for disc brake
WO2005090815A1 (en) * 2004-03-20 2005-09-29 Continental Teves Ag & Co. Ohg Brake disc arrangement for a vehicle disc brake
DE102006017039A1 (en) * 2006-04-11 2007-10-18 Bubenzer Bremsen Gerhard Bubenzer Ing. Gmbh Brake device, brake disc assembly and brake element assembly
IT202100030635A1 (en) * 2021-12-03 2023-06-03 Brembo Spa METHOD OF CONTROL OF A BRAKING SYSTEM IN BBW TECHNOLOGY FOR THE DISTRIBUTION OF BRAKING FORCES FOR SERVICE BRAKING OF A VEHICLE

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164712A (en) * 1984-09-21 1986-03-26 Automotive Products Plc Caliper disc brake
EP0810135A1 (en) * 1996-04-11 1997-12-03 SAME S.p.A. Drive axle for agricultural harvesting machine
US6371250B1 (en) * 1996-12-12 2002-04-16 Delphi Technology, Inc. Disc brake system with ABS
US6223863B1 (en) 1996-12-12 2001-05-01 Federal-Mogul Technology Limited Disc brake suspension for improved turning circle
US6244391B1 (en) 1996-12-12 2001-06-12 Federal-Mogul Technology Limited Disc brake system with ABS
US6247560B1 (en) 1996-12-12 2001-06-19 Federal-Mogul Technology Limited Slidable brake disc system
WO2000009901A1 (en) 1998-08-15 2000-02-24 Federal-Mogul Technology Limited Disc brake pad assembly
EP0994269A2 (en) 1998-10-14 2000-04-19 Shimano Inc. Disk brake assembly
US6164421A (en) * 1998-10-14 2000-12-26 Shimano Inc. Disc brake assembly
EP0994269A3 (en) * 1998-10-14 2002-12-18 Shimano Inc. Disk brake assembly
US6431657B2 (en) 2000-01-31 2002-08-13 Shimano, Inc. Bicycle hub for disc brake
US6352314B1 (en) 2000-01-31 2002-03-05 Shimano Inc. Bicycle hub for disc brake
US6334514B1 (en) 2000-02-02 2002-01-01 Shimano Inc. Bicycle disc brake
USRE38975E1 (en) * 2000-02-02 2006-02-14 Shimano Inc. Bicycle disc brake
US6349800B1 (en) 2000-02-07 2002-02-26 Shimano Inc. Bicycle disc brake assembly
WO2005090815A1 (en) * 2004-03-20 2005-09-29 Continental Teves Ag & Co. Ohg Brake disc arrangement for a vehicle disc brake
DE102006017039A1 (en) * 2006-04-11 2007-10-18 Bubenzer Bremsen Gerhard Bubenzer Ing. Gmbh Brake device, brake disc assembly and brake element assembly
IT202100030635A1 (en) * 2021-12-03 2023-06-03 Brembo Spa METHOD OF CONTROL OF A BRAKING SYSTEM IN BBW TECHNOLOGY FOR THE DISTRIBUTION OF BRAKING FORCES FOR SERVICE BRAKING OF A VEHICLE
WO2023100096A1 (en) * 2021-12-03 2023-06-08 Brembo S.P.A. Method for controlling a braking system with bbw technology for the distribution of braking forces for service braking of a vehicle

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Publication number Publication date
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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920513