CA1090720A - Friction element, particularly for disc brakes - Google Patents
Friction element, particularly for disc brakesInfo
- Publication number
- CA1090720A CA1090720A CA303,507A CA303507A CA1090720A CA 1090720 A CA1090720 A CA 1090720A CA 303507 A CA303507 A CA 303507A CA 1090720 A CA1090720 A CA 1090720A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- friction
- strata
- friction element
- respect
- 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.)
- Expired
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
- 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
- F16D65/12—Discs; Drums for disc brakes
- F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
- F16D65/126—Discs; Drums for disc brakes characterised by the material used for the disc body the material being of low mechanical strength, e.g. carbon, beryllium; Torque transmitting members therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a friction element comprising at least one friction layer of which at least one face constitutes a rubbing surface of the friction element, and which constituted by an assembly of strata of a friction material having a high heat conductivity, particu-larly carbon, said element comprising at least two friction layers having their outer faces constituting opposite rubbing surfaces of the friction element, each layer being formed by an assembly of strata with a rosette type arrangement in the opposite direction with respect to the other layer, each stratum of one layer extending from the rubbing surface over the whole thickness of the layer by being inclined with respect to the rubbing surface.
The present invention relates to a friction element comprising at least one friction layer of which at least one face constitutes a rubbing surface of the friction element, and which constituted by an assembly of strata of a friction material having a high heat conductivity, particu-larly carbon, said element comprising at least two friction layers having their outer faces constituting opposite rubbing surfaces of the friction element, each layer being formed by an assembly of strata with a rosette type arrangement in the opposite direction with respect to the other layer, each stratum of one layer extending from the rubbing surface over the whole thickness of the layer by being inclined with respect to the rubbing surface.
Description
~0~0720 The present invention relates to a friction element, parti-cularly for disc brake, and, more particularly, an element comprising at least one friction layer of which at least one face constitutes a rubbing surface of the friction element, and which is constituted by an assembly of strata of a friction material having a high heat conductivity, parti-cularly carbon.
Friction elements of this type are used in particular for multiple disc brakes for aircraft and are in this case generally formed by a stack of annular flat strata. The strata are oriented perpendicularly to the axis of the discs and the one located at one or each end of the stack defines a rubbing surface of the friction element. This arrangement presents multiple drawbacks.
Firstly, if whole strata cut out in one piece from a reinfor-cing sheet of carbon fibres are used, the unusable waste material resul-ting therefrom is considerable, this increasing the cost price due to the high cost of the material used. Furthermore, the stack of the strata in planes parallel to the rubbing surface does not promote the role of heat well which the friction element must fulfill in order to evacuate the heat produced by the friction as rapidly and uniformly as possible.
Heat stresses may therefore be produced and promote the appearance of cleavages. Moreover, the risks or irregularities of the rubbing sur-faces, due to an irregular wear, are not negligible. This may result in a decohesion of the strata near the rubbing surfaces. Moreover, the passage from one stratum to the other during the wear of the friction element provokes a discontinuity of the rubbing characteristics. Finally, in the case of the manufacture of the discs requiring treatments during which the materials emit gases, or must allow gases or liquids to pene-trate for their densification, the arrangement of the strata one above the other perpendicularly to the axis of the disc is the least favourable as the evacuation or penetration of these fluids which is generally
Friction elements of this type are used in particular for multiple disc brakes for aircraft and are in this case generally formed by a stack of annular flat strata. The strata are oriented perpendicularly to the axis of the discs and the one located at one or each end of the stack defines a rubbing surface of the friction element. This arrangement presents multiple drawbacks.
Firstly, if whole strata cut out in one piece from a reinfor-cing sheet of carbon fibres are used, the unusable waste material resul-ting therefrom is considerable, this increasing the cost price due to the high cost of the material used. Furthermore, the stack of the strata in planes parallel to the rubbing surface does not promote the role of heat well which the friction element must fulfill in order to evacuate the heat produced by the friction as rapidly and uniformly as possible.
Heat stresses may therefore be produced and promote the appearance of cleavages. Moreover, the risks or irregularities of the rubbing sur-faces, due to an irregular wear, are not negligible. This may result in a decohesion of the strata near the rubbing surfaces. Moreover, the passage from one stratum to the other during the wear of the friction element provokes a discontinuity of the rubbing characteristics. Finally, in the case of the manufacture of the discs requiring treatments during which the materials emit gases, or must allow gases or liquids to pene-trate for their densification, the arrangement of the strata one above the other perpendicularly to the axis of the disc is the least favourable as the evacuation or penetration of these fluids which is generally
- 2 -: .
. ,, , ,. . , .,, _, .. , . _ , __ _ ,, _ __ _ .. . . .. . ~ , . ' -. :, : ':
` ~
effected parallel to the strata, can then be made only through the side faces of the stack. This promotes the appearance of the cleavages in the course of treatment, if the evacuation of the gases is rendered difficult, and may lead to an insufficient or heterogeneous densification in the case 5 of the penetration not being able to be effected completely or uniformly from the cylindrical side faces of the stack.
It is an object of the present invention to provide a friction element which does not present the above-mentioned drawbacks, namely a stratified friction element resisting decohesion, which effectively fulfills its role of heat well, the wear of which is progressive and regular, which may be formed by sectors of strata cut out with a mini-mum waste of material and wherein the arrangement of the strata promotes to a maximum the admission or evacuation of gases or liquid in the course of a heat treatment or a densification operation.
This purpose is attained by a friction element which comprises at least two friction layers having their outer faces constituting opposite rubbing surfaces .of the friction element, each layer being formed by an assembly of strata with an arrangement of rosette type in the opposite direction with respect to the other layer, each stratum of a layer extending from the rubbing surface over the whole thickness of the layer by being inclined with respect tothe rubbing surface.
Due to the rosette arrangement, the heat is rapidly evacuated through the strata towards the inside of the friction element Further-more, the rubbing surfaces are constituted by the juxtaposed edges of the strata and not by end strata as in the case of the arrangement by stacking of strata oriented perpendicularly to the axis of the discs, hence a more regular wear and the obtaining of rubbing surfaces with relatively constant characteristics. The regularity of the wear and the better eva-cuation of the heat contribute to reducing the risks of decohesion.
Furthermore, the sector shape of the strata enables them to .. ... .. . . . .
. . ~ . , : . . ..
--: .: . . .
. : .
.
'' - ' '. : '' 1090~Z0 to be cut out in one piece from a reinforcing sheet with a minimum of waste. The cost price of the friction element may therefore be consi-derably reduced. Their arrangement allows on the other hand a better penetration or an improved evacuation of fluids through all the faces of the friction element which they form, hence a clear reduction of the risks oi manufacturing defects occuring.
Finally, due to the double-rosette arrangement, the friction element is subjected to the same stresses on each rubbing surface, for example within the scope of its use as intermediate element in a disc 1 0 brake The invention will be more readily understood on reading the following description with reference to the accompanying drawings, in which:
Fig. 1 is a schematic view in perspective of an embodiment of a friction element according to the inventil;
Fig. Z is a schematic view in perspective, partly torn away, illustrating a layer of the friction element shown in Fig. l;
Fig. 3 is a schematic view in perspective illustrating another embodiment of a friction element according to the invention;
Fig. 4 is a schematic view in perspective illustrating the use as brake disc of a friction element according to the invention, and Figs. 5 and 6 are two schematic views in perspective illustrating two modes of using friction elements according to the inven-tion for producing a multiple disc brake.
Referring now to the drawings, the friction element 10 shown in Fig. 1 is an element of annular shape constituted by two annular friction layers 11, 12 which are superposed, coaxial and connected to each other.
The outer flat faces 13, 14 of the friction layers 11, 12 constitute the rubbing surfaces of the friction element 10.
Each layer 11, 12 is formed by an assembly of strata 15 'r' : . .. : ~ : : , :
. : - : . ~ . : :
: . .: . .. . , . . : : :
.. .. ~ ,. . ~ .
lO9(~ZO
disposed as a rosette Each stratum 15 of a layer extends from the outer face of this layer, where it is flush substantially radially, up to the inner face where it is also flush substantially radially by being inclined with respect to the rubbing face The traces of each stratum 15 on the side faces of a layer therefore extend along a part of the periphery the-reof.
By way of example the strata 15 of each layer are disposed on regulated surfaces each produced by a straight line which passes through the axis 16 of the element and bears on a helix (for example 17) traced on a side face 18 of this layer.
Fig. 2 illustrates the arrangement of the strata 15 in the layer 11 These strata are disposed similarly in layer 12, but with an inclination, with respect to the rubbing surfaces, opposite that of the strata of layer 11. The arrangements of the strata of layers 11, 12 are preferably symmetrical one to the other with respect to the median radial plane of the element 10, the layers 11, 12 having the same thickness The layers 11, 12 may be contiguous (Fig 1) or, as a variant, may be separated by an intermediate layer 19 (Fig. 3) made of a material identical to that of layers 11 and 12 or a different material, for example 2 0 metal The strata 15 are for example cut out of reinforcing sheets constituted by carbon ffbres which are or are not impregnated. As these strata have substantially the shape of an annular sector, cutting out may be effected with minimum waste, this being very important in view of the cost of such sheets. Thus, with respect to the cutting of annular strata, in one piece, the saving of material may be of the order of 30% or more, to form friction elements of the same dimensions.
After assembly of the strata of each layer by rosette arran-gement on one another and superposition of the layers, the element 10 may be formed by a known process of rigidification by densification, for tr -5 -- . .. .
: . ,: . . . . :. . .:
.' ~
- . . . .
~V907Z0 example by deposit of pyro-carbon. It will be noted that the rosette arrangement facilitates, during a densification treatment, the penetration of gas or liquids or the evacuation of gas since this may take place through all the faces of the element 10. This promotes, of course, the obtaining of a friction element with homogeneous physical characteristics, there-fore with constant braking properties as it wears. On this subject, it will be noted that such a wear is progressive and regular since the strata are not orientated perpendicularly to the axis 16.
For its use, for example as brake disc (Fig. 4), the friction element 10 is placed between two rings 21, 22 with respect to which it is animated by a relative rotating movement. Upon braking, the discs 21 and 22 are applied against the rubbing surfaces 13 and 14 of the element 10. In fact, the heat condu~ivity of the strata perpendicularly to the rubbing faces is improved in comparison with a stratification perpendicular to the friction axis.
The regularity of wear and an improved evacuation of heat contribute, of course, to limiting the possibility of creation of mechanical or thermal stresses tending to the decohesion of the strata 15, well anchored within the friction element.
Due to the double-rosette arrangement, the rubbing surfaces 13, 14 of the friction element 10 are urged in the same direction, or -~
"direction of slide" when the element 10 rotates with respect to the discs 21, 22, in the direction materialised by arrow 23, or in "opposite direction", when the element 10 rotates in the other direction (arrow 24).
Figs. 5 and 6 illustrate two relative arrangements of friction elements according to the invention for producing a multiple disc brake of the type used for aircraft.
Figs. 5 and 6 represent coaxial friction elements which are alternately fixed 31, 33, 35 (stators) and rotary 32, 34 (rotors). In the example illustrated, each intermediate element 32, 33, 34 is consti-.;-.. . . . . . . . .. . .
- . . .
' tuted by a friction element according to the invention of the type shown in Fig. 1, with two coupled friction layers constituted by assemblies of strata in rosette arrangement with opposite directions for the two layers. The end friction elements 31, 35 may be of identical consti-tution to that of the intermediate elements or, as illustrated, may be friction elements comprising one friction layer only since these elements 31, 35 have only one rubbing surface.
Upon braking, the friction elements are pressed against one another.
In the case illustrated in Fig. S, the elements are disposed so that all the rubbir.g surfaces are subjected tG the same stresses, either in the "opposite direction" when the rotary elements 32, 34 rotate in the direction materialised by the arrows 36, or in the "direction of slide"
when the rotary elements rotate in the other direction (arrows 37).
In the case illustrated in Fig. 6, the rubbing surfaces of each friction element are subjected to the same stresses but these stresses are opposite for two adjacent elements.
,i, ~ .
" ' .
'
. ,, , ,. . , .,, _, .. , . _ , __ _ ,, _ __ _ .. . . .. . ~ , . ' -. :, : ':
` ~
effected parallel to the strata, can then be made only through the side faces of the stack. This promotes the appearance of the cleavages in the course of treatment, if the evacuation of the gases is rendered difficult, and may lead to an insufficient or heterogeneous densification in the case 5 of the penetration not being able to be effected completely or uniformly from the cylindrical side faces of the stack.
It is an object of the present invention to provide a friction element which does not present the above-mentioned drawbacks, namely a stratified friction element resisting decohesion, which effectively fulfills its role of heat well, the wear of which is progressive and regular, which may be formed by sectors of strata cut out with a mini-mum waste of material and wherein the arrangement of the strata promotes to a maximum the admission or evacuation of gases or liquid in the course of a heat treatment or a densification operation.
This purpose is attained by a friction element which comprises at least two friction layers having their outer faces constituting opposite rubbing surfaces .of the friction element, each layer being formed by an assembly of strata with an arrangement of rosette type in the opposite direction with respect to the other layer, each stratum of a layer extending from the rubbing surface over the whole thickness of the layer by being inclined with respect tothe rubbing surface.
Due to the rosette arrangement, the heat is rapidly evacuated through the strata towards the inside of the friction element Further-more, the rubbing surfaces are constituted by the juxtaposed edges of the strata and not by end strata as in the case of the arrangement by stacking of strata oriented perpendicularly to the axis of the discs, hence a more regular wear and the obtaining of rubbing surfaces with relatively constant characteristics. The regularity of the wear and the better eva-cuation of the heat contribute to reducing the risks of decohesion.
Furthermore, the sector shape of the strata enables them to .. ... .. . . . .
. . ~ . , : . . ..
--: .: . . .
. : .
.
'' - ' '. : '' 1090~Z0 to be cut out in one piece from a reinforcing sheet with a minimum of waste. The cost price of the friction element may therefore be consi-derably reduced. Their arrangement allows on the other hand a better penetration or an improved evacuation of fluids through all the faces of the friction element which they form, hence a clear reduction of the risks oi manufacturing defects occuring.
Finally, due to the double-rosette arrangement, the friction element is subjected to the same stresses on each rubbing surface, for example within the scope of its use as intermediate element in a disc 1 0 brake The invention will be more readily understood on reading the following description with reference to the accompanying drawings, in which:
Fig. 1 is a schematic view in perspective of an embodiment of a friction element according to the inventil;
Fig. Z is a schematic view in perspective, partly torn away, illustrating a layer of the friction element shown in Fig. l;
Fig. 3 is a schematic view in perspective illustrating another embodiment of a friction element according to the invention;
Fig. 4 is a schematic view in perspective illustrating the use as brake disc of a friction element according to the invention, and Figs. 5 and 6 are two schematic views in perspective illustrating two modes of using friction elements according to the inven-tion for producing a multiple disc brake.
Referring now to the drawings, the friction element 10 shown in Fig. 1 is an element of annular shape constituted by two annular friction layers 11, 12 which are superposed, coaxial and connected to each other.
The outer flat faces 13, 14 of the friction layers 11, 12 constitute the rubbing surfaces of the friction element 10.
Each layer 11, 12 is formed by an assembly of strata 15 'r' : . .. : ~ : : , :
. : - : . ~ . : :
: . .: . .. . , . . : : :
.. .. ~ ,. . ~ .
lO9(~ZO
disposed as a rosette Each stratum 15 of a layer extends from the outer face of this layer, where it is flush substantially radially, up to the inner face where it is also flush substantially radially by being inclined with respect to the rubbing face The traces of each stratum 15 on the side faces of a layer therefore extend along a part of the periphery the-reof.
By way of example the strata 15 of each layer are disposed on regulated surfaces each produced by a straight line which passes through the axis 16 of the element and bears on a helix (for example 17) traced on a side face 18 of this layer.
Fig. 2 illustrates the arrangement of the strata 15 in the layer 11 These strata are disposed similarly in layer 12, but with an inclination, with respect to the rubbing surfaces, opposite that of the strata of layer 11. The arrangements of the strata of layers 11, 12 are preferably symmetrical one to the other with respect to the median radial plane of the element 10, the layers 11, 12 having the same thickness The layers 11, 12 may be contiguous (Fig 1) or, as a variant, may be separated by an intermediate layer 19 (Fig. 3) made of a material identical to that of layers 11 and 12 or a different material, for example 2 0 metal The strata 15 are for example cut out of reinforcing sheets constituted by carbon ffbres which are or are not impregnated. As these strata have substantially the shape of an annular sector, cutting out may be effected with minimum waste, this being very important in view of the cost of such sheets. Thus, with respect to the cutting of annular strata, in one piece, the saving of material may be of the order of 30% or more, to form friction elements of the same dimensions.
After assembly of the strata of each layer by rosette arran-gement on one another and superposition of the layers, the element 10 may be formed by a known process of rigidification by densification, for tr -5 -- . .. .
: . ,: . . . . :. . .:
.' ~
- . . . .
~V907Z0 example by deposit of pyro-carbon. It will be noted that the rosette arrangement facilitates, during a densification treatment, the penetration of gas or liquids or the evacuation of gas since this may take place through all the faces of the element 10. This promotes, of course, the obtaining of a friction element with homogeneous physical characteristics, there-fore with constant braking properties as it wears. On this subject, it will be noted that such a wear is progressive and regular since the strata are not orientated perpendicularly to the axis 16.
For its use, for example as brake disc (Fig. 4), the friction element 10 is placed between two rings 21, 22 with respect to which it is animated by a relative rotating movement. Upon braking, the discs 21 and 22 are applied against the rubbing surfaces 13 and 14 of the element 10. In fact, the heat condu~ivity of the strata perpendicularly to the rubbing faces is improved in comparison with a stratification perpendicular to the friction axis.
The regularity of wear and an improved evacuation of heat contribute, of course, to limiting the possibility of creation of mechanical or thermal stresses tending to the decohesion of the strata 15, well anchored within the friction element.
Due to the double-rosette arrangement, the rubbing surfaces 13, 14 of the friction element 10 are urged in the same direction, or -~
"direction of slide" when the element 10 rotates with respect to the discs 21, 22, in the direction materialised by arrow 23, or in "opposite direction", when the element 10 rotates in the other direction (arrow 24).
Figs. 5 and 6 illustrate two relative arrangements of friction elements according to the invention for producing a multiple disc brake of the type used for aircraft.
Figs. 5 and 6 represent coaxial friction elements which are alternately fixed 31, 33, 35 (stators) and rotary 32, 34 (rotors). In the example illustrated, each intermediate element 32, 33, 34 is consti-.;-.. . . . . . . . .. . .
- . . .
' tuted by a friction element according to the invention of the type shown in Fig. 1, with two coupled friction layers constituted by assemblies of strata in rosette arrangement with opposite directions for the two layers. The end friction elements 31, 35 may be of identical consti-tution to that of the intermediate elements or, as illustrated, may be friction elements comprising one friction layer only since these elements 31, 35 have only one rubbing surface.
Upon braking, the friction elements are pressed against one another.
In the case illustrated in Fig. S, the elements are disposed so that all the rubbir.g surfaces are subjected tG the same stresses, either in the "opposite direction" when the rotary elements 32, 34 rotate in the direction materialised by the arrows 36, or in the "direction of slide"
when the rotary elements rotate in the other direction (arrows 37).
In the case illustrated in Fig. 6, the rubbing surfaces of each friction element are subjected to the same stresses but these stresses are opposite for two adjacent elements.
,i, ~ .
" ' .
'
Claims (6)
1. A friction element comprising at least two friction layers having their outer faces constituting opposite rubbing surfaces of the friction element, each layer being formed by a respective assembly of strata with a rosette-type arrangement in the opposite direction with respect to the other layer, said strata being made of a frictional material having a high heat conductiv-ity, and each stratum of each layer extending from the rubbing surface over the whole thickness of the layer by being inclined with respect to the rubbing surface.
2. A friction element as claimed in Claim 1 having the form of a disc or ring wherein each stratum of each layer is dis-posed substantially along a regulated surface produced by a straight line which passes through the axis of the friction element and which bears on a helix traced on the side face of the layer.
3. A friction element as claimed in Claim 1, further comprising at least one intermediate layer between the two friction layers.
4. A friction element as claimed in Claim 1, wherein the arrangements of the strata of the friction layers are symmetrical one to the other with respect to the median radial plane of the friction element.
5. A multiple disc brake comprising alternatively fixed and rotary annular friction elements, in which brake each inter-mediate friction element comprises at least two friction layers having their outer faces constituting opposite rubbing surfaces of the friction element, each layer being formed by a respective assembly of strata with a rosette-type arrangement in the opposite direction with respect to the other layer, said strata being made of a frictional material having a high heat conductivity, and each stratum of each layer extending from the rubbing surface over the whole thickness of the layer by being inclined with respect to the rubbing surface.
6. A disc brake as claimed in Claim 5, wherein the arrangements of the strata of the friction layers of each inter-mediate element are symmetrical one to the other with respect to the median radial plane of this intermediate element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7715984A FR2392280A1 (en) | 1977-05-25 | 1977-05-25 | FRICTION ELEMENT ESPECIALLY FOR DISC BRAKES |
| FR7715984 | 1977-05-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1090720A true CA1090720A (en) | 1980-12-02 |
Family
ID=9191262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA303,507A Expired CA1090720A (en) | 1977-05-25 | 1978-05-16 | Friction element, particularly for disc brakes |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS53146075A (en) |
| BE (1) | BE867393A (en) |
| BR (1) | BR7803347A (en) |
| CA (1) | CA1090720A (en) |
| CH (1) | CH630155A5 (en) |
| DE (1) | DE2822386A1 (en) |
| ES (1) | ES249532Y (en) |
| FR (1) | FR2392280A1 (en) |
| GB (1) | GB1602542A (en) |
| IT (1) | IT1095530B (en) |
| NL (1) | NL7805580A (en) |
| SE (1) | SE441615B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2626637B1 (en) * | 1988-02-02 | 1993-04-16 | Carbone Ind | DISC BRAKE FOR ROTATING SHAFT |
| JPH03194227A (en) * | 1990-10-26 | 1991-08-23 | Toho Rayon Co Ltd | Carbon brake |
| JPH03194228A (en) * | 1990-10-26 | 1991-08-23 | Toho Rayon Co Ltd | Carbon brake with reinforced periphery |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1670224A (en) * | 1923-07-14 | 1928-05-15 | Watson John Warren | Friction member |
| US1845096A (en) * | 1925-10-06 | 1932-02-16 | John Warren Watson Company | Friction equalizing material and use thereof |
| GB938661A (en) * | 1960-10-18 | 1963-10-02 | Ferodo Ltd | Improvements in friction material for use in clutch facings |
| US3730320A (en) * | 1971-05-12 | 1973-05-01 | Goodrich Co B F | High temperature brake disc |
| US3731769A (en) * | 1971-10-13 | 1973-05-08 | Goodrich Co B F | Friction member assembly |
| US3948363A (en) * | 1972-04-19 | 1976-04-06 | The B. F. Goodrich Company | Friction member assembly |
| US3936552A (en) * | 1975-02-05 | 1976-02-03 | The B. F. Goodrich Company | Nonmetallic composite friction member |
-
1977
- 1977-05-25 FR FR7715984A patent/FR2392280A1/en active Granted
-
1978
- 1978-05-05 CH CH489178A patent/CH630155A5/en not_active IP Right Cessation
- 1978-05-11 SE SE7805380A patent/SE441615B/en unknown
- 1978-05-16 CA CA303,507A patent/CA1090720A/en not_active Expired
- 1978-05-18 GB GB20388/78A patent/GB1602542A/en not_active Expired
- 1978-05-23 DE DE19782822386 patent/DE2822386A1/en not_active Withdrawn
- 1978-05-23 NL NL7805580A patent/NL7805580A/en unknown
- 1978-05-23 ES ES1978249532U patent/ES249532Y/en not_active Expired
- 1978-05-24 BR BR787803347A patent/BR7803347A/en unknown
- 1978-05-24 IT IT23768/78A patent/IT1095530B/en active
- 1978-05-24 BE BE2056999A patent/BE867393A/en not_active IP Right Cessation
- 1978-05-25 JP JP6322178A patent/JPS53146075A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE441615B (en) | 1985-10-21 |
| JPS53146075A (en) | 1978-12-19 |
| SE7805380L (en) | 1978-11-26 |
| BR7803347A (en) | 1979-02-06 |
| GB1602542A (en) | 1981-11-11 |
| CH630155A5 (en) | 1982-05-28 |
| IT7823768A0 (en) | 1978-05-24 |
| FR2392280B1 (en) | 1981-04-30 |
| BE867393A (en) | 1978-11-24 |
| NL7805580A (en) | 1978-11-28 |
| IT1095530B (en) | 1985-08-10 |
| DE2822386A1 (en) | 1978-12-21 |
| ES249532U (en) | 1980-11-16 |
| FR2392280A1 (en) | 1978-12-22 |
| ES249532Y (en) | 1981-05-16 |
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