GB2258701A - Disc brake and spring member therefor - Google Patents
Disc brake and spring member therefor Download PDFInfo
- Publication number
- GB2258701A GB2258701A GB9117353A GB9117353A GB2258701A GB 2258701 A GB2258701 A GB 2258701A GB 9117353 A GB9117353 A GB 9117353A GB 9117353 A GB9117353 A GB 9117353A GB 2258701 A GB2258701 A GB 2258701A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring member
- caliper
- mounting bracket
- disc brake
- arms
- 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- Withdrawn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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—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
- F16D65/095—Pivots or supporting members therefor
- F16D65/097—Resilient means interposed between pads and supporting members or other brake parts
- F16D65/0973—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces
- F16D65/0974—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces acting on or in the vicinity of the pad rim in a direction substantially transverse to the brake disc axis
- F16D65/0975—Springs made from wire
-
- 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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
- F16D55/2265—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
- F16D55/227—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing by two or more pins
-
- 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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/0016—Brake calipers
- F16D2055/002—Brake calipers assembled from a plurality of parts
-
- 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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/0041—Resilient elements interposed directly between the actuating member and the brake support, e.g. anti-rattle springs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
A disc brake (10) comprises a mounting bracket (12) having side arms (24) extending across the outer periphery of a rotor (22); a pair of brake pads (16, 18), each comprising a backing plate (36, 38) having a pair of guide surfaces for slidably engaging corresponding guide surfaces (34) on the side arms; a caliper (14) slidably mounted on the mounting bracket, the caliper having a bridge portion (54), and an end portion (56) engageable with one (18) of the brake pads; and a spring member (62, 64) secured to each side arm, each spring member being substantially C-shaped and having a first arm (72) engaging the backing plate (36) of other brake pad (16) to bias the respective guide surfaces into contact, and a second arm (74) engaging the bridge portion of the caliper to bias the caliper towards the mounting bracket. <IMAGE>
Description
DISC BRAKE AND SPRING MEMBER THEREFOR
This invention relates to a disc brake, in particular to a floating or spot-type disc brake, and to a spring member therefor.
Disc brakes are known in which a caliper is slidably mounted on a mounting bracket which is secured to the knuckle (front or rear) of a motor vehicle. The mounting bracket has side arms which extend across the outer periphery of a rotor. Brake pads are slidably mounted on the mounting bracket either side of the rotor, and are moved into frictional engagement with the rotor by a fluid actuated piston slidably mounted in a cylinder in the caliper. It is also known to provide, for this type of disc brake, spring members which act on the caliper and the brake pads to retain the caliper and brake pads on the mounting bracket. Examples can be found in US Patent No. 4,134,477 and GB Patent No.
1,279,055. In US Patent No. 4,134,477, the spring members bias the caliper inwardly, that is, towards the mounting bracket. In GB Patent No. 1,279,055, the spring members bias the caliper outwardly, that is, away from the mounting bracket. In both these publications, the spring members bias both brake pads inwardly. The spring members act also act as anti-rattle springs for the caliper and the brake pads. These known arrangements have the disadvantages of using spring members which are complicated to manufacture and are difficult to install.
It is an object of the present invention to overcome the above mentioned disadvantages.
To this end, a disc brake in accordance with the present invention comprises a mounting bracket securable to a motor vehicle and having side arms extending across the outer periphery of a rotor, each side arm having a longitudinal axis substantially perpendicular to the plane of the rotor, an outer surface directed away from the other side arm, and a lip at each end; a pair of brake pads positionable either side of the rotor and each comprising a backing plate having friction lining material thereon for frictionally engaging the rotor, each backing plate having a pair of guide surfaces for slidably engaging corresponding guide surfaces on the mounting bracket; a caliper slidably mounted on the mounting bracket, the caliper having a bridge portion extending across the outer periphery of the rotor substantially parallel to the side arms, and an end portion engageable with one of the brake pads; a fluid actuated piston slidably mounted in a cylinder in the caliper and engageable with the other of the brake pads, actuation of the piston causing movement of the brake pads and the caliper relative to the mounting bracket in a direction substantially parallel to the longitudinal axes of the side arms to bring the brake pads into frictional engagement with the rotor; and a spring member associated with each side arm, each spring member being substantially
C-shaped and having a base portion engageable with the outer surface of its respective side arm, a leg portion attached to each end of the base portion engageable with the lip at each end of its respective side arm, a first arm attached to one of the leg portions, and a second arm attached to the other of the leg portions, the first arms of each spring member engaging the backing plate of the said other brake pad to bias the respective guide surfaces into contact, the second arms of each spring member engaging the bridge portion of the caliper to bias the caliper towards the mounting bracket, and the base and leg portions of each spring member securing the spring members to their respective side arm.
Preferably, each spring member is made of resilient wire.
Each leg portion of each spring member is preferably bent through a predetermined angle to define a first portion and a second portion, the predetermined angle between the first and second portions determining the biasing force exerted by the first and second arms on the said other brake pad and caliper respectively.
Preferably, the base portion of each spring member is bent in a direction towards the arms to define a central portion which engages the outer surface of the respective side arm.
The bridge portion preferably has a shoulder formed in its edges adjacent the side arms, the second arm of each spring member engaging its respective shoulder to bias the caliper towards the mounting bracket. In this case, each shoulder is preferably defined by first and second surfaces substantially perpendicular to one another.
Preferably, the lip at each end of the side arms is defined by a protrusion which extends away from each side arm in the direction of the longitudinal axis.
The present invention also includes a spring member substantially as herein described for use in a disc brake as herein described.
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a top view of a disc brake in accordance with the present invention;
Figure 2 is a view from one side, partially in cross-section, of the disc brake of Figure 1 in the direction of arrow II;
Figure 3 is a view from the other side of the disc brake of Figure 1 in the direction of arrow
III;
Figure 4 is a cross-sectional view on the line IV-IV in Figure 3;
Figure 5 is a top view of one of the spring members used in the disc brake of Figure 1;
Figure 6 is a side view of the spring member of Figure 4; and
Figure 7 is an end view of the spring member of Figure 4.
Referring to Figures 1 to 4, a disc brake 10 in accordance with the present invention comprises a mounting bracket 12, a caliper 14, and a pair of brake pads 16,18. The mounting bracket 12 is securable to a knuckle (not shown) of a motor vehicle by way of bolts passing through mounting apertures 20. The mounting bracket 12 straddles a rotor 22 secured to a wheel of the motor vehicle, and has a pair of side arms 24 which extend across the outer periphery of the rotor and have a longitudinal axis A substantially perpendicular to the plane of the rotor.Each side arm 24 has an outer surface 26 directed away from the other side arm; a protrusion 28 at each end 30 directed away from the rotor 22 which defines a lip 32, a portion 33 of which is directed substantially inwardly towards the other side arm; and an inner surface 34 directed towards the other side arm which defines a guide surface for the brake pads 16,18. A cross-member 35 interconnects the side arms 24 on one side of the rotor 22.
The brake pads 16,18 each comprise a backing plate 36,38 respectively on which is secured friction lining material 40. The brake pads 16,18 are mounted on either side of the rotor 22 with the friction lining material 40 directed towards the rotor. Each backing plate 36,38 has a pair of guide surfaces 42,44 for slidably engaging the guide surfaces on the inner surfaces 34 of the side arms 24 of the mounting bracket 12.
The caliper 14 is slidably mounted on the mounting bracket 12 by way of slide pins 46 which are secured to the mounting bracket, and which pass though guiding bushes 48 positioned in guiding apertures 50 in the caliper. End caps 52 close the guiding bushes 48 to substantially prevent ingress of dirt and moisture. The caliper 14 has a bridge portion 54 which extends across the outer periphery of the rotor 22 in a longitudinal direction substantially parallel to the side arms 24 of the mounting bracket 12. The bridge portion 54 has a shoulder 90 formed in its outer edges 92 adjacent each side arm 24. The shoulders 90 are substantially parallel to one another and are defined by a first surface 94 directed towards the respective side arm 24, and a second surface 96 directed away from the mounting bracket 12 and substantially perpendicular to the first surface. The caliper 12 also has an end portion 56 which extends substantially perpendicular to the bridge portion 54 and engages the backing plate 38 of one 18 of the brake pads, which is preferably the outer or outboard brake pad. A piston 58, which is fluid pressure actuated, is slidably positioned in a cylinder 60 in the caliper 14, and engages the backing plate 36 of the other brake pad 16, which is preferably the inner or inbroad brake pad. Actuation of the piston 58 causes the piston to push the said other brake pad 16 into frictional engagement with the rotor 22, and by reaction forces, to slide the caliper on the slide pins 46 thereby causing the end portion 56 to also push the said one brake pad 18 into frictional engagement with the rotor.The overall effect is that, on actuation of the piston 58, the brake pads 16,18 and the caliper 14 move relative to the mounting bracket 12 in a direction substantially parallel to the longitudinal axes A of the side arms 24. The operation of the disc brake 10 is well known to those skilled in the art and will not be described in greater detail.
A pair of spring members 62,64 are mounted on the side arms 24 and engage the bridge portion 54 of the caliper 14 and the backing plate 36 of the said other brake pad 16. The spring members 62,64, which are substantially identical, but symmetrically opposed, are preferably made from resilient steel wire. Each spring member 62,64 is substantially
C-shaped (Figures 5 to 7) and has a base portion 66, a leg portion 68,70 attached to each end of the base portion, a first arm 72 attached to one 68 of the leg portions, and a second arm 74 attached to the other 70 of the leg portions. As can be seen from Figures 5 to 7, the said one leg portion 68 is shorter in length than the said other leg portion 70. The free ends 76,78 of each arm 72,74 respectively are directed substantially towards one another.The base portion 66 is bent inwardly towards the arms 72,74 to define a central portion 80 substantially parallel to the arms. Each leg portion 68,70 is preferably bent through a predetermined angle to define first 82,84 and second 86,88 portions respectively. In use, the central portion 80 of the base portion 66 of each spring member 62,64 engages the outer surface 26 of its respective side arm 24, and the leg portions 68,70 engage the inwardly directed portions 33 of the lips 32 of the side arms to prevent the spring members 62,64 moving in a direction substantially towards and away from one another. The lips 32 also retain the spring members 62,64 on the side arms 24 by preventing the spring members moving in a direction substantially away from the mounting bracket 12.The gripping force exerted by the spring members 62,64 on the side arms 24 is determined, in part, by the amount of inward bending of the base portion 66. The first arms 72 of each spring member 62,64 engage the backing plate 36 of the said other brake pad 16 to exert a biasing force on the said other brake pad in an inward direction towards the mounting bracket 12. This biasing force maintains the guide surfaces 42,44 on the backing plate 36 in contact with the corresponding guide surfaces on the inner surface 34 of each side arm 24.Similarly, the second arms 74 of each spring member 62,64 engage the second surface 96 of the shoulders 90 of the bridge portion 54 of the caliper 14 to exert a biasing force on the caliper in an inward direction towards the mounting bracket 12, and engage the first surface 94 to substantially prevent the caliper from moving in a direction towards and away from the side arms 24.
This biasing force maintains the caliper 14 in position relative to the mounting bracket 12 to maintain substantially free sliding action of the caliper on the slide pins 46. Further, this biasing force pushes the bridge portion 54 into contact with the backing plate 38 of the said one brake pad 18, thereby maintaining the guide surfaces 42,44 on this backing plate 38 in contact with the corresponding guide surfaces on the inner surface 34 of each side arm 24. The predetermined angle between the first portion 82,84 and the second portion 86,88 of each leg portion 68,70 respectively can be adjusted to vary the biasing force exerted by the spring members 62,64 on the caliper 14 and/or the said other brake pad 16.
The spring members 62,64, as well as retaining the caliper 14 and the brake pads 16,18 in position, also act as anti-rattle springs for these components, thereby removing the need for separate anti-rattle springs. Further, a retaining spring means between the piston 58 and the said other brake pad 16 is no longer required. The spring members have simple structures, are easy to manufacture, and are easy to install.
It will be appreciated that various modifications could be made to the above described embodiment of the present invention. For example, the lips 32 on each end 30 of the side arms 24 could be defined by grooves formed in each end. Similarly, the shoulders 90 in the bridge portion 54 could be defined by grooves therein. Further still, the central portion 80 of the base portion 66 of each spring member may engage in a groove formed in the outer surface 26 of each side arm 24.
Claims (10)
1. A disc brake comprising a mounting bracket securable to a motor vehicle and having side arms extending across the outer periphery of a rotor, each side arm having a longitudinal axis substantially perpendicular to the plane of the rotor, an outer surface directed away from the other side arm, and a lip at each end; a pair of brake pads positionable either side of the rotor and each comprising a backing plate having friction lining material thereon for frictionally engaging the rotor, each backing plate having a pair of guide surfaces for slidably engaging corresponding guide surfaces on the mounting bracket; a caliper slidably mounted on the mounting bracket, the caliper having a bridge portion extending across the outer periphery of the rotor substantially parallel to the side arms, and an end portion engageable with one of the brake pads; a fluid actuated piston slidably mounted in a cylinder in the caliper and engageable with the other of the brake pads, actuation of the piston causing movement of the brake pads and the caliper relative to the mounting bracket in a direction substantially parallel to the longitudinal axes of the side arms to bring the brake pads into frictional engagement with the rotor; and a spring member associated with each side arm, each spring member being substantially
C-shaped and having a base portion engageable with the outer surface of its respective side arm, a leg portion attached to each end of the base portion engageable with the lip at each end of its respective side arm, a first arm attached to one of the leg portions, and a second arm attached to the other of the leg portions, the first arms of each spring member engaging the backing plate of the said other brake pad to bias the respective guide surfaces into contact, the second arms of each spring member engaging the bridge portion of the caliper to bias the caliper towards the mounting bracket, and the base and leg portions of each spring member securing the spring members to their respective side arm.
2. A disc brake as claimed in Claim 1, wherein each spring member is made of resilient wire.
3. A disc brake as claimed in Claim 1 or
Claim 2, wherein each leg portion of each spring member is bent through a predetermined angle to define a first portion and a second portion, the predetermined angle between the first and second portions determining the biasing force exerted by the first and second arms on the said other brake pad and caliper respectively.
4. A disc brake as claimed in any one of
Claims 1 to 3, wherein the base portion of each spring member is bent in a direction towards the arms to define a central portion which engages the outer surface of the respective side arm.
5. A disc brake as claimed in any one of
Claims 1 to 4; wherein the bridge portion has a shoulder formed in its edges adjacent the side arms, the second arm of each spring member engaging its respective shoulder to bias the caliper towards the mounting bracket.
6. A disc brake as claimed in Claim 5, wherein each shoulder is defined by first and second surfaces substantially perpendicular to one another.
7. A disc brake as claimed in any one of
Claims 1 to 6, wherein the lip at each end of the side arms is defined by a protrusion which extends away from each side arm in the direction of the longitudinal axis.
8. A disc brake substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
9. A spring member substantially as hereinbefore described for use in a disc brake as claimed in any one of Claims 1 to 8.
10. A spring member substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9117353A GB2258701A (en) | 1991-08-10 | 1991-08-10 | Disc brake and spring member therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9117353A GB2258701A (en) | 1991-08-10 | 1991-08-10 | Disc brake and spring member therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9117353D0 GB9117353D0 (en) | 1991-09-25 |
| GB2258701A true GB2258701A (en) | 1993-02-17 |
Family
ID=10699846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9117353A Withdrawn GB2258701A (en) | 1991-08-10 | 1991-08-10 | Disc brake and spring member therefor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2258701A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001086165A1 (en) * | 2000-05-05 | 2001-11-15 | Delphi Technologies Inc. | Apparatus and method for mounting friction elements in disc brakes |
| US10400838B2 (en) | 2016-07-21 | 2019-09-03 | Preferred Tool & Die, Inc. | Caliper hardware providing separation between pad and rotor |
| USD878984S1 (en) | 2018-11-15 | 2020-03-24 | Preferred Tool & Die, Inc. | Brake caliper hardware |
| USD928674S1 (en) | 2020-01-08 | 2021-08-24 | Preferred Tool & Die, Inc. | Brake caliper hardware |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1164548A (en) * | 1966-06-22 | 1969-09-17 | Dba Sa | Spot-Type Disc Brake |
| GB1279055A (en) * | 1969-10-08 | 1972-06-21 | Bendix Corp | Disc brake |
| GB1427692A (en) * | 1973-04-11 | 1976-03-10 | Ferodo Sa | Disc-brakes especially for automobile vehicles |
| US4134477A (en) * | 1976-03-26 | 1979-01-16 | Girling Limited | Sliding caliper disc brakes |
-
1991
- 1991-08-10 GB GB9117353A patent/GB2258701A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1164548A (en) * | 1966-06-22 | 1969-09-17 | Dba Sa | Spot-Type Disc Brake |
| GB1279055A (en) * | 1969-10-08 | 1972-06-21 | Bendix Corp | Disc brake |
| GB1427692A (en) * | 1973-04-11 | 1976-03-10 | Ferodo Sa | Disc-brakes especially for automobile vehicles |
| US4134477A (en) * | 1976-03-26 | 1979-01-16 | Girling Limited | Sliding caliper disc brakes |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001086165A1 (en) * | 2000-05-05 | 2001-11-15 | Delphi Technologies Inc. | Apparatus and method for mounting friction elements in disc brakes |
| US10400838B2 (en) | 2016-07-21 | 2019-09-03 | Preferred Tool & Die, Inc. | Caliper hardware providing separation between pad and rotor |
| USD878984S1 (en) | 2018-11-15 | 2020-03-24 | Preferred Tool & Die, Inc. | Brake caliper hardware |
| USD928674S1 (en) | 2020-01-08 | 2021-08-24 | Preferred Tool & Die, Inc. | Brake caliper hardware |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9117353D0 (en) | 1991-09-25 |
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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) |