GB2148424A - Friction pad and its manufacture - Google Patents
Friction pad and its manufacture Download PDFInfo
- Publication number
- GB2148424A GB2148424A GB08421088A GB8421088A GB2148424A GB 2148424 A GB2148424 A GB 2148424A GB 08421088 A GB08421088 A GB 08421088A GB 8421088 A GB8421088 A GB 8421088A GB 2148424 A GB2148424 A GB 2148424A
- Authority
- GB
- United Kingdom
- Prior art keywords
- friction pad
- density zones
- friction
- zones
- disc
- 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- Withdrawn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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000002783 friction material Substances 0.000 claims abstract description 17
- 235000005121 Sorbus torminalis Nutrition 0.000 claims abstract description 4
- 244000152100 Sorbus torminalis Species 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 9
- 238000000748 compression moulding Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010425 asbestos Substances 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- 229910052895 riebeckite Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/16—Frictional elements, e.g. brake or clutch 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
- F16D2069/005—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
In a friction pad 1 for use in a disc brake, the density of a friction material of the friction pad is varied in the rotational direction of a disc to produce high and low density zones 2a, 2b to reduce brake squeal there may be three or more different density zones. As shown, the zones 2a, 2b are arranged in striped pattern in plan view in Fig. 3 they make a chequer pattern. To manufacture the pad, friction material (asbestos fibres, duct, copper powders and binding agents) are mixed and preformed to a wave-like cross-section with varying thickness-in a heating and compression moulding process the material is deformed into a flat form whereby the projected portions make high density zones and the recessed portions make low density zones. <IMAGE>
Description
SPECIFICATION
Friction pad and its manufacture
This invention relates to a friction pad for use in a disc brake, and particularly to a technique for suppressing the so-called squeal phenomenon in a disc brake. The invention also relates to the manufacture of such a friction pad.
The squeal phenomenon upon applying a disc brake is frequently observed as high pitched harsh sounds being generated and there are strong demands to suppress such phenomenon. The squeal phenomenon is based on frictional vibrations in a frictional sliding surface of the friction pad of the disc brake which slidingly contacts a rotating disc to apply the disc brake and the vibrations induce resonance vibrations in relating members. However, since the vibration system is complicated, it is very difficult to suppress completely such phenomenon and various proposals have been made with respect to respective parts including the friction pad.
Generally, the friction material of the friction pad is required to be superior as to the frictional force generated and as to the antiwear quality; however, these characteristics are contradictory to the squeal phenomenon.
Namely, when the frictional force of the friction pad is improved, the squeal phenomenon is aggravated and the countermeasure for suppressing the squeal phenomenon sometimes decreases the frictional force of the friction pad.
This invention aims to provide a novel friction pad for suppressing the squeal phenomenon.
According to the invention, the density of a friction material of a friction pad for use in a disc brake is varied in the rotational direction of the disc.
Thus, the distribution of the surface pressure on the friction pad in applying the friction pad against the disc is varied in the rotational direction of the disc and, as a result, the vibration characteristics of the friction pad in the rotational direction of the disc are changed substantially, whereby it is possible to suppress the resonance vibrations.
Further, the compressibility of the friction material can also be changed in the rotational direction of the disc, whereby the decrease in the frictional force and the antiwear characteristics can be minimized.
Preferably, high density zones and low density zones of the friction material are arranged alternately in the rotational direction of the disc to define such as a striped or a chequer pattern as viewed in a plan view.
The invention includes a method of making a friction pad for a disc brake, in which a lining mixture is preformed to produce a preform having a thickness which varies in the rotational direction of the disc and the preform is subsequently compressed into a flat form having high density and low density zones alternately in the rotational direction.
The invention will be further described by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a sectional view of a friction pad according to the invention;
Figure 2 is a plan view of the friction pad of
Fig. 1;
Figure 3 is a plan view of a modified friction material;
Figure 4 is a flow chart of a manufacturing process of the friction pad, and
Figure 5 is a sectional view illustrating a preforming process.
In Figs. 1 and 2, the friction pad according to the invention comprises a friction material 1 secured to a backing plate 3 by conventional technique. The friction material 1 comprises high density zones 2a and low density zones 2b which are arranged alternately as viewed in rotational direction A of a disc (not shown in the drawings) and, as clearly shown in Fig. 2, the zones 2a and 2b make a striped pattern. In a modified embodiment of Fig. 3, the high density zones 2a and low density zones 2b make a chequer pattern.
Although the embodiments show only two patterns, wherein high and low density zones are arranged regularly and alternately, the invention is not limited to specified embodiments; namely, three or more different density zones may be arranged at desired intervals to define a desired pattern.
A preferred manufacturing process for the friction pad of Fig. 1 will now be explained with reference to Figs. 4 and 5. A friction material of a disc brake is usually manufactured by the process shown in Fig. 4. Namely, the friction material is usually composed of friction and anti-wear adjusting agents, such as asbestos fibres, dust, copper powders and the like, and binding agents, such as phenolic resin or the like, which are mixed together by utilizing, for example, a V type mixing machine during a mixing process. The mixture is processed in a preforming process wherein a predetermined amount of the mixture is moulded to have the configuration of the friction material at ambient temperature. In the heating and compression moulding process, a high temperature and a high pressure are applied to obtain desired characteristics.
Preferably, the friction material according to the invention is preformed in the preforming process to produce a preform having a wavelike cross-section, as shown in Fig. 5 such that the thickness thereof varies in the rotational direction of the disc and, in the heating and compression moulding process the friction material is forcibly deformed into a flat form, whereby the projected portions make high density zones and recessed portions make low density zones. Shown at 4 in Fig. 5 is a metal mould and at 1' is the mixture being preformed.
As heretofore described, the friction pad according to the invention can effectively suppress the squeal phenomenon with satisfying required characteristics as a friction pad.
Claims (7)
1. A friction pad for use in a disc brake wherein the density of a friction material of the friction pad is varied in the rotational direction of a disc.
2. A friction pad according to claim 1, wherein high density zones and low density zones of the friction material are arranged alternately in the rotational direction of the disc.
3. A friction pad according to claim 2, wherein high density zones and low density zones are arranged in a chequer pattern, as viewed in a plan view.
4. A friction pad according to claim 2, wherein high density zones and low density zones of the friction material are arranged in a striped pattern, as viewed in a plan view.
5. A method of making a friction pad for a disc brake, in which a lining mixture is preformed to produce a preform having a thickness which varies in the rotational direction of the disc and the preform is subsequently compressed into a flat form having high density and low density zones alternately in the rotational direction.
6. A friction pad constructed substantially as herein described with reference to and as illustrated in Figs. 1 and 2 or Fig. 3 of the accompanying drawings.
7. A method of making a friction pad substantially as herein described with reference to Figs. 4 and 5 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983128927U JPS6035930U (en) | 1983-08-20 | 1983-08-20 | Friction pads for disc brakes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8421088D0 GB8421088D0 (en) | 1984-09-26 |
| GB2148424A true GB2148424A (en) | 1985-05-30 |
Family
ID=14996828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08421088A Withdrawn GB2148424A (en) | 1983-08-20 | 1984-08-20 | Friction pad and its manufacture |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6035930U (en) |
| DE (1) | DE3430599C2 (en) |
| FR (1) | FR2550838B1 (en) |
| GB (1) | GB2148424A (en) |
| IT (1) | IT1179053B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316987A1 (en) * | 1987-11-19 | 1989-05-24 | Ferodo Limited | Sintered metal friction facing |
| US5456339A (en) * | 1994-03-23 | 1995-10-10 | Alliedsignal Inc. | Noise attenuated brake friction member |
| US5555959A (en) * | 1992-05-11 | 1996-09-17 | Everett; Richard C. | Partitioned bicycle brake shoe pad of different compositions on the braking surface for simultaneous contact with the rim |
| US6167992B1 (en) | 1998-07-14 | 2001-01-02 | Alliedsignal Inc. | Abrasive coating on brake pads |
| US6244396B1 (en) | 1999-07-28 | 2001-06-12 | Avid, Llc | Brake block for a bicycle having replaceable brake pad segments |
| WO2002084139A1 (en) * | 2001-04-10 | 2002-10-24 | Volvo Lastvagnar Ab | Brake member, disk brake, drum brake and method for manufacturing brake members |
| US6499571B1 (en) * | 2001-06-07 | 2002-12-31 | Meritor Heavy Vehicle Technology, Llc | Brake pad with improved green performance |
| DE102007048363A1 (en) * | 2007-10-09 | 2009-04-23 | Federal-Mogul Friction Products Gmbh | Brake pad set with different compressibility |
| WO2010144977A1 (en) * | 2009-06-19 | 2010-12-23 | Duroline S.A. | Process for manufacturing brake linings, manufacturing moulds and product obtained |
| CN102102719A (en) * | 2009-12-18 | 2011-06-22 | 日清纺制动器株式会社 | Method for manufacturing a disc brake pad |
| CN102933867A (en) * | 2010-07-05 | 2013-02-13 | 三菱电机株式会社 | Brake lining and method for manufacturing same |
| US20160129656A1 (en) * | 2013-06-18 | 2016-05-12 | Akebono Brake Industry Co., Ltd. | Mold for brake pad friction material, manufacturing apparatus, manufacturing method, preform, and brake pad |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT398726B (en) * | 1987-09-29 | 1995-01-25 | Leinweber Anstalt Ing Joh | METHOD AND PRESS FOR PRODUCING BLOCKS |
| CA1323979C (en) * | 1988-02-23 | 1993-11-09 | Masao Inoue | Method for manufacturing a pad for a disk brake |
| DE4003336A1 (en) * | 1990-02-05 | 1991-08-08 | Teves Gmbh Alfred | Brake lining - has different zones of different friction to reduce oscillation during braking |
| HUT60368A (en) * | 1990-03-19 | 1992-08-28 | Zaporozhskijj Avtomobilnyjj Z | Grinding member of friction-pair particularly for brake- and clutch-plates |
| DE4119515C1 (en) * | 1991-06-13 | 1992-12-10 | Textar Gmbh, 5090 Leverkusen, De | |
| AT410015B (en) * | 1997-07-04 | 2003-01-27 | Hoerbiger & Co | Friction ring for a clutch or brake, and method of production of a friction ring |
| DE102009012056A1 (en) | 2009-03-06 | 2010-09-09 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Disk brake for motor vehicle, has brake disk comprising two circumferential patterns which correspond to radially lateral-edge regions of friction surface, where brake pad is pressable on brake disk |
| DE102012017874A1 (en) * | 2012-09-11 | 2014-03-27 | Hoerbiger Antriebstechnik Holding Gmbh | Method for producing a friction lining and friction lining |
| JP6239151B2 (en) * | 2014-04-29 | 2017-11-29 | ポール エイ． ステファヌッティ、 | Friction material, method of forming the same, and system including friction material |
| DE102015107562B4 (en) * | 2015-05-13 | 2017-06-22 | Tmd Friction Services Gmbh | Method for producing a brake shoe, press for producing brake shoes and brake shoe |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB448351A (en) * | 1935-01-01 | 1936-06-08 | Small & Parkes Ltd | Improvements in brake linings |
| GB616982A (en) * | 1945-03-09 | 1949-01-31 | Lorraine Carbone | Improvements in friction linings with composite surfaces |
| GB1028843A (en) * | 1962-02-16 | 1966-05-11 | Ferodo Sa | Improvements in pads for disc-brakes and method and device for manufacturing the same |
| GB1083344A (en) * | 1965-03-05 | 1967-09-13 | Brake Linings Ltd | Improvements relating to friction materials |
| GB1224823A (en) * | 1969-03-12 | 1971-03-10 | Plexowood Inc | Improvements in and relating to mould loading tools |
| GB1264543A (en) * | 1968-03-11 | 1972-02-23 | ||
| GB1295401A (en) * | 1970-05-21 | 1972-11-08 | ||
| GB1563514A (en) * | 1975-12-08 | 1980-03-26 | Castolin Sa | Track brake |
| WO1983002651A1 (en) * | 1982-01-26 | 1983-08-04 | Matti Tapanainen | Procedure for manufacturing a brake block |
| GB2125122A (en) * | 1982-07-27 | 1984-02-29 | Fibrax Ltd | A brake pad for use in a disc brake |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR753410A (en) * | 1932-07-22 | 1933-10-16 | Improvements to brake linings for all applications | |
| US2284785A (en) * | 1939-04-10 | 1942-06-02 | Cleveland Graphite Bronze Co | Frictional material and method of making same |
| CH363856A (en) * | 1958-12-24 | 1962-08-15 | Saurer Ag Adolph | Sliding part with dry friction for high operating temperatures, especially for bearings and seals |
| GB1143992A (en) * | 1966-08-04 | 1969-02-26 | Ferodo Ltd | Railway brake block |
| DE2109907A1 (en) * | 1970-03-03 | 1971-09-30 | Kyriazis Th | Brake pad |
| US3791493A (en) * | 1970-12-05 | 1974-02-12 | Nippon Carbon Co Ltd | Friction elements for braking rotary bodies |
| US3906466A (en) * | 1974-08-09 | 1975-09-16 | Sperry Rand Corp | Propagation circuit for cross-tie wall memory system |
| HU183259B (en) * | 1980-12-03 | 1984-04-28 | Autoipari Kutato Fejlesztoe | Brake shoe for drum arake |
-
1983
- 1983-08-20 JP JP1983128927U patent/JPS6035930U/en active Pending
-
1984
- 1984-08-17 IT IT8467824A patent/IT1179053B/en active
- 1984-08-17 FR FR8412940A patent/FR2550838B1/en not_active Expired
- 1984-08-20 DE DE3430599A patent/DE3430599C2/en not_active Expired
- 1984-08-20 GB GB08421088A patent/GB2148424A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB448351A (en) * | 1935-01-01 | 1936-06-08 | Small & Parkes Ltd | Improvements in brake linings |
| GB616982A (en) * | 1945-03-09 | 1949-01-31 | Lorraine Carbone | Improvements in friction linings with composite surfaces |
| GB1028843A (en) * | 1962-02-16 | 1966-05-11 | Ferodo Sa | Improvements in pads for disc-brakes and method and device for manufacturing the same |
| GB1083344A (en) * | 1965-03-05 | 1967-09-13 | Brake Linings Ltd | Improvements relating to friction materials |
| GB1264543A (en) * | 1968-03-11 | 1972-02-23 | ||
| GB1224823A (en) * | 1969-03-12 | 1971-03-10 | Plexowood Inc | Improvements in and relating to mould loading tools |
| GB1295401A (en) * | 1970-05-21 | 1972-11-08 | ||
| GB1563514A (en) * | 1975-12-08 | 1980-03-26 | Castolin Sa | Track brake |
| WO1983002651A1 (en) * | 1982-01-26 | 1983-08-04 | Matti Tapanainen | Procedure for manufacturing a brake block |
| GB2125122A (en) * | 1982-07-27 | 1984-02-29 | Fibrax Ltd | A brake pad for use in a disc brake |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316987A1 (en) * | 1987-11-19 | 1989-05-24 | Ferodo Limited | Sintered metal friction facing |
| US4871394A (en) * | 1987-11-19 | 1989-10-03 | Ferodo Limited | Sintered metal friction facing |
| US5555959A (en) * | 1992-05-11 | 1996-09-17 | Everett; Richard C. | Partitioned bicycle brake shoe pad of different compositions on the braking surface for simultaneous contact with the rim |
| US5456339A (en) * | 1994-03-23 | 1995-10-10 | Alliedsignal Inc. | Noise attenuated brake friction member |
| US6167992B1 (en) | 1998-07-14 | 2001-01-02 | Alliedsignal Inc. | Abrasive coating on brake pads |
| US6244396B1 (en) | 1999-07-28 | 2001-06-12 | Avid, Llc | Brake block for a bicycle having replaceable brake pad segments |
| WO2002084139A1 (en) * | 2001-04-10 | 2002-10-24 | Volvo Lastvagnar Ab | Brake member, disk brake, drum brake and method for manufacturing brake members |
| US6499571B1 (en) * | 2001-06-07 | 2002-12-31 | Meritor Heavy Vehicle Technology, Llc | Brake pad with improved green performance |
| DE102007048363A1 (en) * | 2007-10-09 | 2009-04-23 | Federal-Mogul Friction Products Gmbh | Brake pad set with different compressibility |
| WO2010144977A1 (en) * | 2009-06-19 | 2010-12-23 | Duroline S.A. | Process for manufacturing brake linings, manufacturing moulds and product obtained |
| CN102102719A (en) * | 2009-12-18 | 2011-06-22 | 日清纺制动器株式会社 | Method for manufacturing a disc brake pad |
| CN102933867A (en) * | 2010-07-05 | 2013-02-13 | 三菱电机株式会社 | Brake lining and method for manufacturing same |
| CN102933867B (en) * | 2010-07-05 | 2016-03-02 | 三菱电机株式会社 | A kind of brake facing |
| US20160129656A1 (en) * | 2013-06-18 | 2016-05-12 | Akebono Brake Industry Co., Ltd. | Mold for brake pad friction material, manufacturing apparatus, manufacturing method, preform, and brake pad |
| US10144189B2 (en) * | 2013-06-18 | 2018-12-04 | Akebono Brake Industry Co., Ltd. | Mold for brake pad friction material, manufacturing apparatus, manufacturing method, preform, and brake pad |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8467824A0 (en) | 1984-08-17 |
| FR2550838A1 (en) | 1985-02-22 |
| DE3430599A1 (en) | 1985-03-07 |
| GB8421088D0 (en) | 1984-09-26 |
| DE3430599C2 (en) | 1986-08-28 |
| IT1179053B (en) | 1987-09-16 |
| FR2550838B1 (en) | 1989-11-24 |
| JPS6035930U (en) | 1985-03-12 |
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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) |