GB2259553A - A disc brake pad - Google Patents
A disc brake pad Download PDFInfo
- Publication number
- GB2259553A GB2259553A GB9119128A GB9119128A GB2259553A GB 2259553 A GB2259553 A GB 2259553A GB 9119128 A GB9119128 A GB 9119128A GB 9119128 A GB9119128 A GB 9119128A GB 2259553 A GB2259553 A GB 2259553A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc brake
- brake pad
- friction material
- moulded
- recessed element
- 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- Withdrawn
Links
- 239000002783 friction material Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract description 10
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 abstract description 2
- 229920001568 phenolic resin Polymers 0.000 description 9
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000005011 phenolic resin Substances 0.000 description 6
- 239000000945 filler Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- SLGWESQGEUXWJQ-UHFFFAOYSA-N formaldehyde;phenol Chemical compound O=C.OC1=CC=CC=C1 SLGWESQGEUXWJQ-UHFFFAOYSA-N 0.000 description 2
- 229920003986 novolac Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
-
- 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
-
- 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
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D69/0408—Attachment of linings specially adapted for plane linings
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/002—Combination of different friction materials
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/0441—Mechanical interlocking, e.g. roughened lining carrier, mating profiles on friction material and lining carrier
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/0483—Lining or lining carrier material shaped in situ
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
A disc brake pad which in use avoids problems (eg of overheating brake fluid) associated with the conduction of heat generated during brake operation has its friction material 2 contained in a recessed element 3 (moulded for example from a phenolic sheet moulding composition) of low thermal conductivity, whose base forms the pad backing. The base of the recessed element is strengthened by a rib 8. <IMAGE>
Description
Disc brake pads
This invention relates to disc brake pads, and in particular to disc brake pads for automotive applications.
Disc brake pads are conventionally used in one of two forms. The first is that in which a pad of friction material is moulded direct onto a metal support plate, usually described as a backing plate. In the second form, which is used especially in the USA, the friction material is first moulded as a discrete pad, and this is subsequently secured to a metal backing plate by riveting.
Currently, particularly with non-asbestos friction materials, which often contain steel fibres, problems arise as a result of the conduction of heat from the friction material through the metal backing plate and the metal piston of the brake to the brake fluid itself. This tends to result in overheating, even boiling, of the brake fluid, with consequent brake failure.
The present invention provides a construction in which the friction material of the brake pad is thermally insulated from the associated brake piston, so that problems arising from heat conduction are in large measure avoided.
According to the invention, there is provided a disc brake pad in which the friction material is contained in a moulded recessed element of low thermal conductivity whose base forms the pad backing.
The base of the recessed element may be ribbed to strengthen it.
By "low" thermal conductivity, we mean: low in comparison with the metal of which backing plates are commonly made.
Heat-resistant material of appropriately low thermal conductivity can be obtained by moulding heat-curable phenolic resin moulding compositions in solid form, such as those comprising a phenol formaldehyde resin, non-metallic fibrous reinforcing material, and optionally non-fibrous particles of filler, of the composition
phenolic resin: 20-40%
fibrous reinforcement: 20-80%
non-fibrous particulate filler 0-50%
These are available as so-called dough moulding compositions and sheet moulding compositions, and particularly suitable forms of such compositions comprise a phenol formaldehyde novolak resin; a phenol formaldehyde resole resin as cross-linking agent for the novolak resin; fibrous reinforcement (preferably glass fibre); and non-fibrous particulate filler (eg calcium carbonate).
Alternatively, a phenolic prepreg may be employed as moulding material.
In addition to its enabling problems arising from heat conduction to be avoided, the recessed element of the disc brake pad of the invention, especially when moulded from phenolic resin moulding compositions in solid form, is light ie of relatively low density compared with metal.
Moreover, it is not corroded by salt spray thrown up on roads in winter; does not have to be mechanically keyed to the friction material (for the two easily bond to one another by adhesion); and does not have to be machined to shape, for it can be moulded, as by compression moulding, in one step. Furthermore, the friction material is positively located against lateral displacement.
The recessed element is suitably compression moulded to include all chamfers, tabs, ribs and the like as required, and the friction material is then moulded direct into the recess, so that it bonds adhesively to the walls and bottom of the recess. A particularly strong bond develops when the friction material is itself based on a heat-curable phenolic resin.
The invention is further illustrated with reference to the accompanying drawings, in which:
Fig 1 is a view in perspective of the recessed element
of a disc brake pad;
Fig 2 is a view partly in section of one form of pad;
and
Fig 3 is a similar view of a second form of pad
The pad 1 comprises friction material 2, which may be of an entirely conventional kind based on a heat-curable phenolic resin, and an element 3 having a recess 4 to whose bottom 5 and side wall 6 the friction material 2 is bonded through adhesion during curing of the phenolic resin component of the friction material. The base 7 of the recessed element 3 supports the friction material, and it is strengthened by a longitudinal rib 8.
Typical dimensions would be; Fig 2: height of recessed element, 17mm
depth of recess therein, 12 mm
Fig 3: height of recessed element, 8mm
depth of recess therein, 3mm
depth of friction material, 12mm
The element 3 is suitably made by compression-moulding a sheet moulding composition made in accordance with Example 5 in GB-A-2 218 995. If desired, the element can be moulded around the previously-made pad-shaped friction material.
In the embodiment of Fig 2 the "surround" furnished by the side walls of the recessed element prevents the friction material from causing undue wear of the associated disc when the brakes are off but touching. Additionally the effective area of frictional engagement during braking is enlarged. Both the friction material and the side walls of the recessed element are worn down by operation of the brake.
Claims (6)
1 A disc brake pad comprising friction material and a
backing therefore, in which the friction material is
contained in a moulded recessed element of low thermal
conductivity whose base forms the pad backing.
2 A disc brake pad according to claim 1, in which the
base of the recessed element is ribbed.
3 A disc brake pad according to claim 1 or 2, in which
the recessed element is moulded from a heat-curable
phenolic moulding composition in solid form.
4 A disc brake pad according to claim 3, in which the
friction material is itself moulded from a
heat-curable phenolic moulding composition.
5 A disc brake pad substantially as herein described
with reference to Figs 1 and 2 of the accompanying
drawings.
6 A disc brake pad substantially as herein described
with reference to Figs 1 and 3 of the accompanying
drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9119128A GB2259553A (en) | 1991-09-07 | 1991-09-07 | A disc brake pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9119128A GB2259553A (en) | 1991-09-07 | 1991-09-07 | A disc brake pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9119128D0 GB9119128D0 (en) | 1991-10-23 |
| GB2259553A true GB2259553A (en) | 1993-03-17 |
Family
ID=10701052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9119128A Withdrawn GB2259553A (en) | 1991-09-07 | 1991-09-07 | A disc brake pad |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2259553A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1006289A3 (en) * | 1998-12-02 | 2000-06-28 | AlliedSignal Bremsbelag GmbH | Brake lining for disc brakes |
| WO2002010608A1 (en) * | 2000-07-31 | 2002-02-07 | Federal-Mogul Friction Materials Gmbh | Disck brake |
| EP1217246A1 (en) * | 2000-12-19 | 2002-06-26 | Federal-Mogul Friction Products GmbH | Brake pad for disc brakes |
| WO2005085669A1 (en) * | 2004-03-03 | 2005-09-15 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Pair of brake linings for a disk brake |
| WO2009040660A1 (en) * | 2007-09-26 | 2009-04-02 | Fq Innovation Technology S.R.L. | Brake assembly for motor vehicles and similar |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1232539A (en) * | 1968-07-18 | 1971-05-19 |
-
1991
- 1991-09-07 GB GB9119128A patent/GB2259553A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1232539A (en) * | 1968-07-18 | 1971-05-19 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1006289A3 (en) * | 1998-12-02 | 2000-06-28 | AlliedSignal Bremsbelag GmbH | Brake lining for disc brakes |
| US6267206B1 (en) | 1998-12-02 | 2001-07-31 | Alliedsignal Bremsbelag Gmbh | Brake lining for disk brakes |
| WO2002010608A1 (en) * | 2000-07-31 | 2002-02-07 | Federal-Mogul Friction Materials Gmbh | Disck brake |
| EP1180612A1 (en) * | 2000-07-31 | 2002-02-20 | Federal-Mogul Friction Materials GmbH | Disc brake |
| US6983830B2 (en) | 2000-07-31 | 2006-01-10 | Federal-Mogul Friction Products Gmbh | Disc brake |
| EP1217246A1 (en) * | 2000-12-19 | 2002-06-26 | Federal-Mogul Friction Products GmbH | Brake pad for disc brakes |
| WO2005085669A1 (en) * | 2004-03-03 | 2005-09-15 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Pair of brake linings for a disk brake |
| WO2009040660A1 (en) * | 2007-09-26 | 2009-04-02 | Fq Innovation Technology S.R.L. | Brake assembly for motor vehicles and similar |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9119128D0 (en) | 1991-10-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |