GB2346182A - Brake disc pad - Google Patents

Brake disc pad Download PDF

Info

Publication number
GB2346182A
GB2346182A GB9901661A GB9901661A GB2346182A GB 2346182 A GB2346182 A GB 2346182A GB 9901661 A GB9901661 A GB 9901661A GB 9901661 A GB9901661 A GB 9901661A GB 2346182 A GB2346182 A GB 2346182A
Authority
GB
United Kingdom
Prior art keywords
pad
back plate
centre line
brake disc
brake
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Withdrawn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
GB9901661A
Other versions
GB9901661D0 (en
Inventor
Dene Stephen Williams
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.)
MG Rover Group Ltd
Original Assignee
MG Rover Group Ltd
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 MG Rover Group Ltd filed Critical MG Rover Group Ltd
Priority to GB9901661A priority Critical patent/GB2346182A/en
Publication of GB9901661D0 publication Critical patent/GB9901661D0/en
Publication of GB2346182A publication Critical patent/GB2346182A/en
Withdrawn legal-status Critical Current

Links

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
    • F16D65/00—Parts or details
    • F16D65/0006—Noise or vibration control
    • 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
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/092—Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes

Landscapes

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

Abstract

A brake disc pad 10 has a groove formed in a back plate parallel to but offset from the radial centre line of the pad. This is to produce a pad with non-symmetrical stiffness thereby to reduce standing wave vibrations in the pad which cause brake squeal.

Description

Pipe Brakes The present invention relates to disc brakes for vehicles and in particular to the problem of brake squeal.
Analysis has established that brake squeal in disc brakes is partly due to vibrations set up in the brake pads. The$e vibrations tend to be symmetrical about the radial centreline of the pads, with a node at each end of the pad and an antinode in the centre. The present invention aims to make use of this analysis to provide an improved disc brake.
Accordingly the present invention provides a pad for a disc brake having radially inner and radially outer edges and two ends and a centre line arranged to extend in use radially of a brake disc, the pad comprising a back plate and a friction lining, wherein the back plate is arranged so as to have a stiffness which varies in a non-symmetrical manner about the centre line.
Preferred embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is a section through a brake pad according to the invention, and Figure 2 is a front view of the pad of Figure 1.
A pad 10 for a disc brake comprises a back plate 12 with a friction lining 14 mounted on it. The pad has parallel ends, 16,18, a radially inner edge 20 arranged in use to be nearest the axis of the brake disc which the pad operates on, and a radially outer edge 22 arranged to be, in'use, furthest from that axis. The pad is therefore approximately symmetrical in hape about a centre line 24 which runs parallel to the two ends 16,18 and in a direction which will be radial to the disc when the pad is in use.
When the pad 10 is in use it is compressed against a brake disc by one or more pistons acting on the back plate. As discussed above the problem of brake squeal is, in part, caused by vibrations set up in the disc. These vibrations tend to take the form of a standing wave with a node at each end 16,18 of the pad and an anti-node on the centre line 24. In order to counteract the tendency for such wave patterns to form, the back plate, which is otherwise of uniform thickness, is formed with a groove 26 running down it, parallel to the centre line 24 and offset from it to one side. In the embodiment shown the groove 26 has one edge substantially on the centre line 24. The effect of the groove 26 is to produce a region, in this case a line, of reduced stiffness running down the back plate, to one side of the centre line 24. This gives the back plate 12, and therefore the whole pad 10, a stiffness which is non-symmetrical about the centre line 24. This tends to prevent a standing wave such as that described above from occurring.
It will be appreciated that the cross section of the groove is not critical and could take a variety of forms. Similarly instead of a single groove, either a plurality of grooves, or a row of cut-outs, blind bores, or depressions running parallel to the centre line thereby forming a line of reduced stiffness could be used.
A line of through bores or apertures right through the back plate could also be used.

Claims (4)

  1. CLAIMS 1. A pad for a disc brake having radially inner and radially outer edges and two ends and a centre line arranged to extend in use radially of a brake disc, the pad comprising a back plate and a friction lining, wherein the back plate is arranged so as to have a stiffness which varies in a non-symmetrical manner about the centre line.
  2. 2. A pad according to claim 1 wherein the back plate comprises a plate of substantially uniform thickness with one or more cut-outs formed in it to provide a region of reduced stiffness.
  3. 3. A pad according to claim 2 wherein the region comprises a line of reduced stiffness extending across the back plate parallel to the centre line.
  4. 4. A brake disc pad substantially as hereinbefore described with reference to the accompanying drawings.
GB9901661A 1999-01-27 1999-01-27 Brake disc pad Withdrawn GB2346182A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9901661A GB2346182A (en) 1999-01-27 1999-01-27 Brake disc pad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9901661A GB2346182A (en) 1999-01-27 1999-01-27 Brake disc pad

Publications (2)

Publication Number Publication Date
GB9901661D0 GB9901661D0 (en) 1999-03-17
GB2346182A true GB2346182A (en) 2000-08-02

Family

ID=10846507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9901661A Withdrawn GB2346182A (en) 1999-01-27 1999-01-27 Brake disc pad

Country Status (1)

Country Link
GB (1) GB2346182A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1275306A (en) * 1969-06-27 1972-05-24 Bba Group Ltd Improvements in or relating to disc brake assemblies and a method of making a brake pad for such assemblies
GB1275075A (en) * 1968-09-06 1972-05-24 Sumitomo Electric Industries Disc brake and an anti-squeal brake shoe therefor
GB1310843A (en) * 1969-09-03 1973-03-21 Aisin Seiki Spot disc brakes
GB1589392A (en) * 1976-09-30 1981-05-13 Abex Pagid Equip Disc brake pads
GB2143916A (en) * 1983-06-20 1985-02-20 Tokico Ltd Disc brake
GB2245667A (en) * 1990-06-28 1992-01-08 Ferodo Ltd Disc brake pad backplate
GB2260173A (en) * 1991-10-01 1993-04-07 Flertex Sa Disc brake pad for railway use
GB2262320A (en) * 1991-12-10 1993-06-16 Ferodo Ltd Brake pad

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1275075A (en) * 1968-09-06 1972-05-24 Sumitomo Electric Industries Disc brake and an anti-squeal brake shoe therefor
GB1275306A (en) * 1969-06-27 1972-05-24 Bba Group Ltd Improvements in or relating to disc brake assemblies and a method of making a brake pad for such assemblies
GB1310843A (en) * 1969-09-03 1973-03-21 Aisin Seiki Spot disc brakes
GB1589392A (en) * 1976-09-30 1981-05-13 Abex Pagid Equip Disc brake pads
GB2143916A (en) * 1983-06-20 1985-02-20 Tokico Ltd Disc brake
GB2245667A (en) * 1990-06-28 1992-01-08 Ferodo Ltd Disc brake pad backplate
GB2260173A (en) * 1991-10-01 1993-04-07 Flertex Sa Disc brake pad for railway use
GB2262320A (en) * 1991-12-10 1993-06-16 Ferodo Ltd Brake pad

Also Published As

Publication number Publication date
GB9901661D0 (en) 1999-03-17

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)