CA1137884A - Disc brake pad assemblies - Google Patents
Disc brake pad assembliesInfo
- Publication number
- CA1137884A CA1137884A CA000397550A CA397550A CA1137884A CA 1137884 A CA1137884 A CA 1137884A CA 000397550 A CA000397550 A CA 000397550A CA 397550 A CA397550 A CA 397550A CA 1137884 A CA1137884 A CA 1137884A
- Authority
- CA
- Canada
- Prior art keywords
- spring
- projection means
- backing plate
- recesses
- top edge
- 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
Landscapes
- Braking Arrangements (AREA)
Abstract
A B S T R A C T
A friction pad assembly comprises a backing plate having friction material secured thereto, and an anti-rattle spring having a bent portion intermediate its ends, the bent portion being wrapped around a pro-jection extending upwardly from the top edge of the backing plate and being retained in a pair of laterally spaced recesses defined between the projection and a pair of side abutments. The assembly is inexpensive to pro-duce and has improved anti-rattle properties.
A friction pad assembly comprises a backing plate having friction material secured thereto, and an anti-rattle spring having a bent portion intermediate its ends, the bent portion being wrapped around a pro-jection extending upwardly from the top edge of the backing plate and being retained in a pair of laterally spaced recesses defined between the projection and a pair of side abutments. The assembly is inexpensive to pro-duce and has improved anti-rattle properties.
Description
113~8~
DISC BRAKE P~D I~SSE~IBI,II:S
__ This invention relates to friction pad assemblies for use in sliding caliper disc brakes.
Commolly, friction pads are supported on guides of the disc brake, the braking drag forces being transmitted from the pad to the vehicle frame via the guides. Clearance is usually provided between the guides and the pad to permit the pad to slide towards and away from the disc during brake application and release. To prevent rattling of the pad on the guides it has previously been proposed to attach to the pad an anti-rattle spring to bias the pad against the guide.
A pad assembly incorporating an anti-rattle spring is illustrated and described in U.S. Patent No. 4,056,174 issued November 1, 1977 to Wienand et al. The spring shown in that patent has a coil portion and two arms çxtending outwardly from the coil portion. The spring is attached to an upwardly extending projection on the pad backing plate by a pin passing through the coil portion of the spring.
That pad assembly has proved expensive to produce because a considerable amount of backing plate material has to be scrapped during production, which is by a stamping pro-cess, because the provision of the projection necessitates a larger blank of material than would otherwise be required.
The quality, and thus the cost of the backing plate material is necessarily high.
Pg/
113~
In an attempt to reduce the amount of scrap material, it has been proposed to locate the anti-rat-tle spring in a groove in the backing plate, the pad holding the spriny in position. This has the disadvantage that -the spring has to be located in the groove before the friction material is moulded on to the back plate. The heat required in the moulding process can damage the spring and alter its characteristics~ Furthermore, we have discovered that when the pad ~ools the spring remains "fixed" and cannot adjust its position to allow the pad assembly to align properly in the brake. Such fail-ure to align creates uneven side loads on the pad causing it to tilt within the pad guides.
The aim of the present invention is to overcome, or at least reduce, the above-mentioned disadvantages of previously pro-posed pad assemblies.
This application is a division of Canadian Application Serial No. 335,566 filed September 13, 1979.
- The problems of the prior art are overcome by the invention of the parent application by providing a friction pad assembly comprising a backing plate having front and rear faces and friction material secured to the front face, an anti-rattle spring having a bent portion intermed-iate its ends, and a recess extending across the width of the backing plate from the front to the rear faces thereof, the recess having an opening which extends outwardly through the edge of the backing plate between the front and rear faces thereof the opening being smaller -than the largest dimension of the recess, the bent intermediate portion of the spring being seated in the recess and forming a positive connec-tion ther~with by the inherent resilience of the bent portion, the recess and the bent portion forming the sole connection between the spring and the backing plate, the recess being accessible to Pg/~ .
113~
secure the spring to the backincJ plate after the friction material is secured to the backinc3 plate, the spring being removable from the recess without deformation of the backing plate.
On the other hand the invention of this divisional application overcomes the problems of the prior art by pro-viding a friction pad assembly comprising: a backing plate having front a~d rear faces, a t~p edge, and two lateral edges:
projection means extending upwardly from the top edge of the backing plate, the projection means including a pair of laterally spaced apart recesses defining therebetween a cen-tral abutment portion of the projection means and defining laterally outwardly of the recesses a pair of side abutment portions of the projection means; friction material secur-ed to the front face of the backi.ng plate; and an anti-rattle spring secured to the projection means by means of a bent region of the spring which passes through the recesses and forms an interlock fit with the abutment portions.
Several embodiments of th.e invention in the form of disc brake pad assemblies will now be described, by way of example, with reference to the accompanying drawings, in which: -Figure 1 is a side elevation of one form of assem-hly, Figure 2 is a plan view of the assembly of Figure 1, Figure 3 is a side elevation of the backing plate of the assembly of Figure 1, Pg/~! ~\ 3 1~37~
Figure 4 is a detail perspectiye view of the backing plate of Figure 3, E'igure 5 is a si.de elevation of another form of assembly, Figure 6 is a cross sectional view taken on lines 6~6 of Figure 5, Figure 7 and 8 are views similar to those of Figure 5 and 6, respectivel~, before attachment of an anti-rattle spring, ~o Figure 9 is a side elevation of another form of assembly, Figure 10 is a detail side view of yet another form of assembly, Figure 11 is a view similar to that of Figure 10 of yet another form of assembly, Figure 12 is a detail transverse sectional view of the assembly of Figure 11, Figure 13 is a sectional view similar to that of Figure 12 of a further form of assembly, and pg/',~ - 3A -1~37~3~4 ~ igure 14 is a detail view showing means for retain-ing a spring of an assembly.
Each of the forms of pad assembly comprises the backing plate 1 and a pad 2. The backing plate 1 has later-ally extending shoulders 3 which are free of friction pad material and which, when mounted in a sliding caliper disc brake, are supported on guides. A suitable disc brake for mounting the pad assemblies described herein is described - and illustrated in aforementioned U.S. Patent No. 4jO56,174.
The pad assembly of Figures 1 t~ 4 comprises an anti-rattle spring 4 having a bent portion 5 of rectangular shape and two outwardly and upwardly extending arms 6. When mount-ed in a brake, the arms 6 serve to bias the shoulders 3 against their guides to prevent or reduce rattle of the assembly. Side parts 5A of the bent portion seat in recesses provided by undercuts 7 formed at the base of an upwardly extending projection 8 on the backing pla-te 1. The spring 4 is preferably wrapped around the projection in such a manner that it is difficult to remove the spring from the projection.
The projection 8 has a depth considerably smaller than - that of the projection of the pad assembly described in the U.S. patent identified above, the comparative si~ze of the last-mentioned projection being , ~, - , .
~137~
sho~ in broken lines in Figure 1. The deptll of projection 8 is the minimllm required to provide the undercuts 7.
In the pad assembl~ of ~igures 5 to 8, the backing plate 1 has a recess formed by a hole 1 which provides an opening 12 at the top of the plate, the opening 12 having a width less than the diameter of the hole 11. A spring 13 havins a circular coil portion 1~
and outwardly extending arms 15 is inserted in the recess with the plane o~ the coil portion 14 being parallel with 1~ the plane of the backing plate 1.
One side o~ the hole 11 is partially covered by the pad 2 and the edge of the other side o~ the hole is inturned after insertion of the spring to form a lip 16. Thus, the spring is prevented from falling out of the - 15 hole.
In each of the above described emboditnen*s the bent portion of the spring has at least one complete turn.
The last-described embodiment has the advantages over the fixst described embodiment that the 3prinS 13 acts as a true coil sprinS which utilizes the full spring effect of the coil portion 1t~ hereas in the spring 4 the resilience is pro~ided by the arms 6, and that the projection 8 is not required.
~urthermore, the diameter of the coil portion 14 can be so chosen that it is an interference fit in the hole 11, but that when the spring is laden the diameter can alter to be smaller than the hole diameter.
Thus, the spring 13 can be readily inserted by loading it to reduce the diameter o~ coil portion lt~ and then insertingr the coil portion into the hole. The change in diameter o~ the coil portion 1~ under load ensures mo~e-ment of that portion durins use w~1ich preven-ts corrosion which provides a cleaning effect o~ the hole 1l.
In the assemblies described be]ow the bent 1~37~3~4 port;.o~s are only par-t:ially coi.1ed.
The embodiment of ~ig~lre 9 is similar to that of ~isure 1 and the same numerals are used to denote similar parts. The bent portion 5 is part~rectangular in shape and seats in recesses formed hy undercuts 7 at the base of the upwardly extendins portion 8 of the backing plate 1. The portion 8 may extend to a greater height and be tapered to,permit the spring to ba pushed downwardly over the portion 8.
The bent portion 5 of the spring ~ of the assembly of ~igure 10 is part-circ~lar and seats in a part-circular recess 9 whose upper openinS width is less than the diameter of the recess. I`he plane of the bent portion 5 is substantially parallel with the plane-of baclcing plate 1.
Figures 11 and 12 shown an assembly in which the spring bent portion is substantially part rectangular, two sides of the portion fitting in recesses 11 formed - in an ups-tanding portion 8 of the backins plate 1~ In this form of assenlbly cut-outs 17 are provided on one side of the portion 8 to ensure that the arms 6 of the sprin~ do not protrude beyond the plane of the rear sur-face lA of the backing'plate.
The assembly of Fisllre :l3 is sim:ilar to that of Fisures 11 ancl 12 except that the cut-outs 17 are not provided.
Figure 14 illustrates an assembly in which the spring seats in recesses ~8 in an upstand:ins portion 8 of the backing plate 1 and is retained therein by projec-tions or lips16. The recesses are preferably locatedclose to the base of the portion 8 so that the heigh-t of the portion is as small as poss.ible~
In each of the abo~e described embod~ ents it is possible to arrange the bent portion of the spr:in~ SllCh that the i.nherent res:ilience o~ tl-le spri.nS ret~;.ns the ~13~884 spring in position in the recess. ~urthermore, it will be appreciated that the spr:ings may be attac}led *o the backins plate after the pad has been secured thereto, so that the spring is not subjected to *he hea-t required to bond *he pad to the backing plate.
It will be appreciated that to accommodate the larger projection of *he pad assembly described in said Complete Specification a recess ~as provided in the caliper bridge of the disc brake and that the above-described pad assembl:ies require a much s~n~ller recess, ornone at all. Thus, the bridge may be made tnore compact and/or stronser.
, .
` .
' ~
DISC BRAKE P~D I~SSE~IBI,II:S
__ This invention relates to friction pad assemblies for use in sliding caliper disc brakes.
Commolly, friction pads are supported on guides of the disc brake, the braking drag forces being transmitted from the pad to the vehicle frame via the guides. Clearance is usually provided between the guides and the pad to permit the pad to slide towards and away from the disc during brake application and release. To prevent rattling of the pad on the guides it has previously been proposed to attach to the pad an anti-rattle spring to bias the pad against the guide.
A pad assembly incorporating an anti-rattle spring is illustrated and described in U.S. Patent No. 4,056,174 issued November 1, 1977 to Wienand et al. The spring shown in that patent has a coil portion and two arms çxtending outwardly from the coil portion. The spring is attached to an upwardly extending projection on the pad backing plate by a pin passing through the coil portion of the spring.
That pad assembly has proved expensive to produce because a considerable amount of backing plate material has to be scrapped during production, which is by a stamping pro-cess, because the provision of the projection necessitates a larger blank of material than would otherwise be required.
The quality, and thus the cost of the backing plate material is necessarily high.
Pg/
113~
In an attempt to reduce the amount of scrap material, it has been proposed to locate the anti-rat-tle spring in a groove in the backing plate, the pad holding the spriny in position. This has the disadvantage that -the spring has to be located in the groove before the friction material is moulded on to the back plate. The heat required in the moulding process can damage the spring and alter its characteristics~ Furthermore, we have discovered that when the pad ~ools the spring remains "fixed" and cannot adjust its position to allow the pad assembly to align properly in the brake. Such fail-ure to align creates uneven side loads on the pad causing it to tilt within the pad guides.
The aim of the present invention is to overcome, or at least reduce, the above-mentioned disadvantages of previously pro-posed pad assemblies.
This application is a division of Canadian Application Serial No. 335,566 filed September 13, 1979.
- The problems of the prior art are overcome by the invention of the parent application by providing a friction pad assembly comprising a backing plate having front and rear faces and friction material secured to the front face, an anti-rattle spring having a bent portion intermed-iate its ends, and a recess extending across the width of the backing plate from the front to the rear faces thereof, the recess having an opening which extends outwardly through the edge of the backing plate between the front and rear faces thereof the opening being smaller -than the largest dimension of the recess, the bent intermediate portion of the spring being seated in the recess and forming a positive connec-tion ther~with by the inherent resilience of the bent portion, the recess and the bent portion forming the sole connection between the spring and the backing plate, the recess being accessible to Pg/~ .
113~
secure the spring to the backincJ plate after the friction material is secured to the backinc3 plate, the spring being removable from the recess without deformation of the backing plate.
On the other hand the invention of this divisional application overcomes the problems of the prior art by pro-viding a friction pad assembly comprising: a backing plate having front a~d rear faces, a t~p edge, and two lateral edges:
projection means extending upwardly from the top edge of the backing plate, the projection means including a pair of laterally spaced apart recesses defining therebetween a cen-tral abutment portion of the projection means and defining laterally outwardly of the recesses a pair of side abutment portions of the projection means; friction material secur-ed to the front face of the backi.ng plate; and an anti-rattle spring secured to the projection means by means of a bent region of the spring which passes through the recesses and forms an interlock fit with the abutment portions.
Several embodiments of th.e invention in the form of disc brake pad assemblies will now be described, by way of example, with reference to the accompanying drawings, in which: -Figure 1 is a side elevation of one form of assem-hly, Figure 2 is a plan view of the assembly of Figure 1, Figure 3 is a side elevation of the backing plate of the assembly of Figure 1, Pg/~! ~\ 3 1~37~
Figure 4 is a detail perspectiye view of the backing plate of Figure 3, E'igure 5 is a si.de elevation of another form of assembly, Figure 6 is a cross sectional view taken on lines 6~6 of Figure 5, Figure 7 and 8 are views similar to those of Figure 5 and 6, respectivel~, before attachment of an anti-rattle spring, ~o Figure 9 is a side elevation of another form of assembly, Figure 10 is a detail side view of yet another form of assembly, Figure 11 is a view similar to that of Figure 10 of yet another form of assembly, Figure 12 is a detail transverse sectional view of the assembly of Figure 11, Figure 13 is a sectional view similar to that of Figure 12 of a further form of assembly, and pg/',~ - 3A -1~37~3~4 ~ igure 14 is a detail view showing means for retain-ing a spring of an assembly.
Each of the forms of pad assembly comprises the backing plate 1 and a pad 2. The backing plate 1 has later-ally extending shoulders 3 which are free of friction pad material and which, when mounted in a sliding caliper disc brake, are supported on guides. A suitable disc brake for mounting the pad assemblies described herein is described - and illustrated in aforementioned U.S. Patent No. 4jO56,174.
The pad assembly of Figures 1 t~ 4 comprises an anti-rattle spring 4 having a bent portion 5 of rectangular shape and two outwardly and upwardly extending arms 6. When mount-ed in a brake, the arms 6 serve to bias the shoulders 3 against their guides to prevent or reduce rattle of the assembly. Side parts 5A of the bent portion seat in recesses provided by undercuts 7 formed at the base of an upwardly extending projection 8 on the backing pla-te 1. The spring 4 is preferably wrapped around the projection in such a manner that it is difficult to remove the spring from the projection.
The projection 8 has a depth considerably smaller than - that of the projection of the pad assembly described in the U.S. patent identified above, the comparative si~ze of the last-mentioned projection being , ~, - , .
~137~
sho~ in broken lines in Figure 1. The deptll of projection 8 is the minimllm required to provide the undercuts 7.
In the pad assembl~ of ~igures 5 to 8, the backing plate 1 has a recess formed by a hole 1 which provides an opening 12 at the top of the plate, the opening 12 having a width less than the diameter of the hole 11. A spring 13 havins a circular coil portion 1~
and outwardly extending arms 15 is inserted in the recess with the plane o~ the coil portion 14 being parallel with 1~ the plane of the backing plate 1.
One side o~ the hole 11 is partially covered by the pad 2 and the edge of the other side o~ the hole is inturned after insertion of the spring to form a lip 16. Thus, the spring is prevented from falling out of the - 15 hole.
In each of the above described emboditnen*s the bent portion of the spring has at least one complete turn.
The last-described embodiment has the advantages over the fixst described embodiment that the 3prinS 13 acts as a true coil sprinS which utilizes the full spring effect of the coil portion 1t~ hereas in the spring 4 the resilience is pro~ided by the arms 6, and that the projection 8 is not required.
~urthermore, the diameter of the coil portion 14 can be so chosen that it is an interference fit in the hole 11, but that when the spring is laden the diameter can alter to be smaller than the hole diameter.
Thus, the spring 13 can be readily inserted by loading it to reduce the diameter o~ coil portion lt~ and then insertingr the coil portion into the hole. The change in diameter o~ the coil portion 1~ under load ensures mo~e-ment of that portion durins use w~1ich preven-ts corrosion which provides a cleaning effect o~ the hole 1l.
In the assemblies described be]ow the bent 1~37~3~4 port;.o~s are only par-t:ially coi.1ed.
The embodiment of ~ig~lre 9 is similar to that of ~isure 1 and the same numerals are used to denote similar parts. The bent portion 5 is part~rectangular in shape and seats in recesses formed hy undercuts 7 at the base of the upwardly extendins portion 8 of the backing plate 1. The portion 8 may extend to a greater height and be tapered to,permit the spring to ba pushed downwardly over the portion 8.
The bent portion 5 of the spring ~ of the assembly of ~igure 10 is part-circ~lar and seats in a part-circular recess 9 whose upper openinS width is less than the diameter of the recess. I`he plane of the bent portion 5 is substantially parallel with the plane-of baclcing plate 1.
Figures 11 and 12 shown an assembly in which the spring bent portion is substantially part rectangular, two sides of the portion fitting in recesses 11 formed - in an ups-tanding portion 8 of the backins plate 1~ In this form of assenlbly cut-outs 17 are provided on one side of the portion 8 to ensure that the arms 6 of the sprin~ do not protrude beyond the plane of the rear sur-face lA of the backing'plate.
The assembly of Fisllre :l3 is sim:ilar to that of Fisures 11 ancl 12 except that the cut-outs 17 are not provided.
Figure 14 illustrates an assembly in which the spring seats in recesses ~8 in an upstand:ins portion 8 of the backing plate 1 and is retained therein by projec-tions or lips16. The recesses are preferably locatedclose to the base of the portion 8 so that the heigh-t of the portion is as small as poss.ible~
In each of the abo~e described embod~ ents it is possible to arrange the bent portion of the spr:in~ SllCh that the i.nherent res:ilience o~ tl-le spri.nS ret~;.ns the ~13~884 spring in position in the recess. ~urthermore, it will be appreciated that the spr:ings may be attac}led *o the backins plate after the pad has been secured thereto, so that the spring is not subjected to *he hea-t required to bond *he pad to the backing plate.
It will be appreciated that to accommodate the larger projection of *he pad assembly described in said Complete Specification a recess ~as provided in the caliper bridge of the disc brake and that the above-described pad assembl:ies require a much s~n~ller recess, ornone at all. Thus, the bridge may be made tnore compact and/or stronser.
, .
` .
' ~
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A friction pad assembly comprising a backing plate having front and rear faces, a top edge, and two lateral edges: projection means extending upwardly from the top edge of the backing plate, the projection means includ-ing a pair of laterally spaced apart recesses defining therebetween a central abutment portion of the projection means and defining laterally outwardly of the recesses a pair of side abutment portions of the projection means;
friction material secured to the front face of the back-ing plate; and an anti-rattle spring secured to the projection means by means of a bent region of the spring which passes through said recesses and forms an inter-lock fit with said abutment portions.
friction material secured to the front face of the back-ing plate; and an anti-rattle spring secured to the projection means by means of a bent region of the spring which passes through said recesses and forms an inter-lock fit with said abutment portions.
2. A friction pad assembly according to claim 1 wherein the bent region of the spring includes: a central portion located between the recesses and lying against the projection means in engagement with the central abutment portion; two transverse portions, one transverse portion extending transversely from each end of the central por-tion through a respective recess; and two end portions, one end portion extending from each transverse portion in a laterally outward direction in engagement with the side abutment portions of the projection means.
3. A friction pad assembly according to claim 2 wherein each of said side abutment portions is provided with cut-outs to accommodate the spring thereat whereby no portion of the spring extends beyond the plane of the rear face of the backing plate.
4. A friction pad assembly according to claim 1, wherein said recesses open onto lateral edges of the pro-jection, and wherein the side abutment portions are formed by lips defining a relatively small mouth of the recesses.
5. A friction pad assembly according to any of claims 1, 2 or 3 wherein said projection means is located centrally on said top edge and wherein said spring includes arm portions which extend from said bent portion away from said top edge and towards respective lateral edges of said backing plate.
6. A friction pad assembly according to claim 4 wherein said projection means is located centrally on said top edge and wherein said spring includes arm portions which extend from said bent portion away from said top edge and towards respective lateral edges of said backing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000397550A CA1137884A (en) | 1978-09-14 | 1982-03-03 | Disc brake pad assemblies |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7836802 | 1978-09-14 | ||
| GB36802/78 | 1978-09-14 | ||
| GB46110/78 | 1978-11-27 | ||
| GB7846110 | 1978-11-27 | ||
| CA335,566A CA1125676A (en) | 1978-09-14 | 1979-09-13 | Disc brake pad assemblies |
| CA000397550A CA1137884A (en) | 1978-09-14 | 1982-03-03 | Disc brake pad assemblies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1137884A true CA1137884A (en) | 1982-12-21 |
Family
ID=27426179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000397550A Expired CA1137884A (en) | 1978-09-14 | 1982-03-03 | Disc brake pad assemblies |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1137884A (en) |
-
1982
- 1982-03-03 CA CA000397550A patent/CA1137884A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |