GB2264154A - Disc brake - Google Patents
Disc brake Download PDFInfo
- Publication number
- GB2264154A GB2264154A GB9203257A GB9203257A GB2264154A GB 2264154 A GB2264154 A GB 2264154A GB 9203257 A GB9203257 A GB 9203257A GB 9203257 A GB9203257 A GB 9203257A GB 2264154 A GB2264154 A GB 2264154A
- Authority
- GB
- United Kingdom
- Prior art keywords
- brake pad
- rotor
- caliper
- lining material
- friction lining
- 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- Withdrawn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
- F16D65/0979—Resilient means interposed between pads and supporting members or other brake parts not subjected to brake forces acting on the rear side of the pad or an element affixed thereto, e.g. spring clips securing the pad to the brake piston or caliper
-
- 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
- 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
-
- 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
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
-
- 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
- F16D2055/0045—Braking members arranged non-symmetrically with respect to the brake disc
-
- 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
- F16D2065/026—Braking members; Mounting thereof characterised by a particular outline shape of the braking member, e.g. footprint of friction lining
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
In a disc brake 10 for braking a rotor the backing plate of an inner brake pad 14 has slots 82, 84 by which the inner brake pad is slidably mounted on rails 70, 72 on the bridge portion of caliper 12. The rail 70 on the leading edge 74, in relation to forward rotation F of the rotor, of the bridge portion has a different height from the rail 72 on the trailing edge 76; and the inner brake pad is solely mounted on the caliper. The outer brake pad 16 is fixed to the caliper leg portion 32 by studs 66 on the backing pate 24 engaging in bores 64 and by spring 60 secured to the backing plate 24. A bleed screw cap (52, Fig 3) provides means for securing the conductor of a wear sensor (54); and the friction linings of the pads are circumferentially offset. <IMAGE>
Description
DISC BRAKE
This invention relates to a disc brake for a motor vehicle.
An example of the prior art is disclosed in
GB 2065249A. In this known arrangement, the disc brake comprises a caliper which is slidably mounted on a pin on a support member, and inner and outer brake pads. The inner and outer brake pads are positionable on either side of a rotor to be braked.
The caliper comprises a main body within which a piston is slidably mounted, a bridge portion (which straddles the rotor), and a leg portion. The piston is engageable with the inner brake pad. The outer brake pad is bolted to the leg portion. The inner brake pad is slidably mounted on rails on the edges of the bridge portion of the caliper and on a second pin secured to the support member. Hydraulic actuation of the disc brake moves the piston to press the inner brake pad into frictional engagement with the rotor, and by reaction force, also presses the outer brake pad into frictional engagement with the rotor.This arrangement has the disadvantages that it is difficult to change the brake pads; that where the friction lining material on the inner and outer brake pads is offset, then the inner brake pads may be mounted on the wrong disc brake; that the mounting arrangement of the inner brake pad can inhibit easy sliding of the inner brake pad and the caliper on brake actuation; and braking forces on the inner brake pad pass directly to the support member, which in certain applications is not desirable.
It is an object of the present invention to overcome the above disadvantages.
A disc brake for braking a rotor in accordance with the present invention comprises a caliper which can be slidably mounted on a support member; an inner brake pad comprising a backing plate with friction lining material attached thereto; and an outer brake pad comprising a backing plate with friction lining material attached thereto; the caliper comprising a body portion positionable on one side of the rotor and in which a piston is slidably mounted and engageable with the backing plate of the inner brake pad, a leg portion positionable on the other side of the rotor and to which the backing plate of the outer brake pad is attached, and a bridge portion for straddling the rotor and being integral with the body portion and the leg portion, the bridge portion having a rail of predetermined length extending in a longitudinal direction substantially parallel to the rotational axis of the rotor along each edge of the bridge portion, and the backing plate of the inner brake pad having corresponding slots by which the inner brake pad is slidably mounted on the rails; wherein the rail on the leading edge, in relation to forward rotation of the rotor, of the bridge portion has a different height from the rail on the trailing edge; and wherein the inner brake pad is solely mounted on the caliper.
Preferably, the height of the rail on the leading edge of the bridge portion is less than the height of the rail on the trailing edge.
The outer brake pad is preferably attached to the leg portion of the caliper by a spring clip.
Where the backing plates of the inner and outer brake pads have centres which are aligned, and which define a plane with the rotational axis of the rotor, the friction lining material on the inner brake pad preferably has a centre which is offset from the plane on one side thereof, and the friction lining material on the outer brake pad preferably has a centre which is offset from the plane on the other side thereof. In this case, the centres of the friction lining material of the inner and outer brake pads are preferably offset from the plane by the same distance. In either case, the friction lining material of the inner brake pad is preferably offset in the trailing direction in relation to forward rotation of the rotor, and the friction lining material of the outer brake pad is preferably offset in the leading direction.
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a side view of a disc brake in accordance with the present invention with certain parts shown in partial cross-section;
Figure 2 is an end view of the disc brake of Figure 1 shown in partial cross-section on the line A-A in Figure 1;
Figure 3 is a bottom view of the disc brake of Figure 1; and
Figure 4 is a top view of the disc brake of
Figure 1.
Referring to the drawings, a disc brake 10 is shown comprising a caliper 12, an inner brake pad 14, and an outer brake pad 16. The disc brake 10 is used for braking a rotor 18 (Figure 1 only) which is secured to, and rotates (about a rotational axis) with, a wheel (not shown) of a motor vehicle. The inner brake pad 14 comprises a backing plate 20 to which friction lining material 22 is secured.
Similarly, the outer brake pad 16 comprises a backing plate 24 to which friction lining material 26 is secured. As can be seen from Figures 2 and 3, the centres of the backing plates 20,24 are substantially aligned and lie on a plane P along with the rotational axis of the rotor 18. The centre of the friction lining material 22 on the inner brake pad 14 is offset from the plane P in a trailing direction (in relation to forward rotation F - Figure 2 - of the rotor 18), and the centre of the friction lining material 26 on the outer brake pad 16 is offset from the plane P in a leading direction. The amount or distance of offset is preferably the same for each friction lining material 22,26. This offsetting arrangement helps to reduce brake noise on actuation of the disc brake 10.
The caliper 12 comprises a body portion 30 positioned on one side of the rotor 18, a leg portion 32 positioned on the other side of the rotor, and a bridge portion 34 which straddles the outer edge of the rotor and is integral with the leg and body portions. The body portion 30 comprises a bore 36 within which a piston 38 is slidably mounted, and which is closed at one end 40 to define a fluid chamber 42. A seal 44 substantially prevents egress of hydraulic fluid from the fluid chamber 42, and an elastomeric dust cover 46 substantially prevents contaminants reaching the sliding surfaces of the piston 38 and the bore 36. In use, hydraulic fluid enters and leaves the fluid chamber 42 by way of threaded bore 48. A bleed screw 50 also allows air to be bled from the fluid chamber 42.A bleed screw cap 52 substantially prevents contaminants entering the fluid chamber 42 by way of the bleed screw 50, and also provides means by which an insulated conductor 54 of a wear sensor 56 may be secured, the wear sensor being mounted in an aperture 58 in the backing plate 20 of the inner brake pad 14.
The backing plate 20 of the inner brake pad 14 is secured to the piston 38. The backing plate 24 he outer brake pad 16 is secured to the leg portion 32 of the caliper 12 by way of a spring clip 60. The spring clip 60 is secured to the backing plate 24 of the outer brake pad 16, and has a pair of arms 62 which extend in opposite directions and which, at their free ends, extend into throughbores 64 in the leg portion 32, to resiliently grip the leg portion. Further, studs 66 on the backing plate 24 of the outer brake pad 16 extend into the throughbores 64 to help secure the outer brake pad in position. This arrangement allows easy removal and replacement of the outer brake pad 16, and the spring clip 60 also acts as an anti-rattle spring for the outer brake pad.
The bridge portion 34 of the caliper includes a rail 70,72 along each edge 74,76 respectively. The rails 70,72 have a predetermined length to allow removal and replacement of the inner brake pad 14 (as detailed below), and extend in a longitudinal direction substantially parallel to the rotational axis of the rotor 18 and hence the plane
P. The rail 70 on edge 74, which is the leading edge in relation to rotation of the rotor in the forward direction F, has a height H1, and the rail 72 on the edge 76, which is the trailing edge, has a height H2.
These heights H1,H2 are different from one another, and height H1 is preferably less than height H2. H1 is preferably 6.5mm, and H2 is preferably 8.5mm. The backing plate 20 of the inner brake pad 14 has a pair of arms 78,80 which extend outwardly and are positioned adjacent the edges 74,76, respectively, of the bridge portion 34. Each arm 78,80 has a slot 82,84, respectively, formed therein which corresponds to the adjacent rail 70,72, respectively, such that each rail extends into its corresponding slot and allows the inner brake pad 14 to be mounted on, and slide on, the rails.The slots 82,84 have a predetermined clearance, preferably 1.5mm, with respect to the heights H1,H2 of the rails 70,72 to allow easy sliding of the inner brake pad 14 on the rails, to allow easy removal and replacement of the inner brake pad (as detailed below), and to allow limited pivoting of the inner brake pad relative to the bridge portion 34 on actuation of the disc brake 10. The bridge portion 34 has an aperture 86 therein within which an anti-rattle spring 88 is mounted for engaging the backing plate 20 of the inner brake pad 14.
The caliper 12 is slidably mounted on a support member (not shown) such as torque bracket, steering knuckle, etc., by way of a pair of bolts 90 (Figure 1 only). Each bolt 90 extends through a cylindrical sleeve 92 which is slidably mounted to extend through a pair of bores 94 in the body portion 30 of the caliper 12. Elastomeric dust covers 96,98 at each end of each bore 94 substantially prevent contaminants reaching the sliding surfaces of the sleeves 92 and bores, and a protection cap 100 mounted on one end of each sleeve substantially prevents the adjacent dust cover 96 from being damaged by the support member.
On actuation of the disc brake 10 by a vehicle operator, the pressure exerted by the hydraulic fluid in the fluid chamber 42 increases to move the piston 38 and inner brake pad 14 towards the rotor 18. When the friction lining material 22 of the inner brake pad 14 frictionally engages the rotor 18, the caliper 12 moves in the opposite direction (due to reaction forces) on sleeves 92 to bring the friction lining material 26 of the outer brake pad 16
Into frictional engagement with the rotor 18.
Release of the braking action results in the reverse of the above movement. As both the inner and outer brake pads 14,16 are mounted solely on the caliper 12, all the braking forces generated on actuation of the disc brake 10 pass directly to the caliper. This is particularly important as in certain arrangements the disc brake may be mounted on a support member which is not designed to receive braking forces directly.
The inner brake pad 14 can be removed and replaced by detaching the caliper 12 from the support member, unclipping the outer brake pad 16 from the leg portion 32 of the caliper, and then sliding the inner brake pad off the rails 70,72. A replacement inner brake pad can then be slid into position on the rails 70,72. The difference in the heights H1, H2 ensures that the required inner brake pads for the left- and right-hand disc brakes are fitted correctly. Further, it is preferable for H2 to be greater than H1 because on brake actuation during forward rotation of the rotor 18, the trailing edge 76 of the bridge portion 34 is subjected to a much greater torque than the leading edge 74. Making H2 greater than H1 provides a larger area of contact between the bridge portion 34 and the backing plate 20 at the trailing edge 76, thereby helping to dissipate the braking forces over a larger area.
Claims (7)
1. A disc brake for braking a rotor comprising a caliper which can be slidably mounted on a support member; an inner brake pad comprising a backing plate with friction lining material attached thereto; and an outer brake pad comprising a backing plate with friction lining material attached thereto; the caliper comprising a body portion positionable on one side of the rotor and in which a piston is slidably mounted and engageable with the backing plate of the inner brake pad, a leg portion positionable on the other side of the rotor and to which the backing plate of the outer brake pad is attached, and a bridge portion for straddling the rotor and being integral with the body portion and the leg portion, the bridge portion having a rail of predetermined length extending in a longitudinal direction substantially parallel to the rotational axis of the rotor along each edge of the bridge portion, and the backing plate of the inner brake pad having corresponding slots by which the inner brake pad is slidably mounted on the rails; wherein the rail on the leading edge, in relation to forward rotation of the rotor, of the bridge portion has a different height from the rail on the trailing edge; and wherein the inner brake pad is solely mounted on the caliper.
2. A disc brake as claimed in Claim 1, wherein the height of the rail on the leading edge of the bridge portion is less than the height of the rail on the trailing edge.
3. A disc brake as claimed in Claim 1 or
Claim 2, wherein the outer brake pad is attached to the leg portion of the caliper by a spring clip.
4. A disc brake as claimed in any one of
Claims 1 to 3, in which the backing plates of the inner and outer brake pads have centres which are aligned, and which define a plane with the rotational axis of the rotor, wherein the friction lining material on the inner brake pad has a centre which is offset from the plane on one side thereof, and wherein the friction lining material on the outer brake pad has a centre which is offset from the plane on the other side thereof.
5. A disc brake as claimed in Claim 5, wherein the centres of the friction lining material of the inner and outer brake pads are offset from the plane by the same distance.
6. A disc brake as claimed in Claim 5 or
Claim 6, wherein the friction lining material of the inner brake pad is offset in the trailing direction in relation to forward rotation of the rotor, and the friction lining material of the outer brake pad is offset in the leading direction.
7. A disc brake substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9203257A GB2264154A (en) | 1992-02-15 | 1992-02-15 | Disc brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9203257A GB2264154A (en) | 1992-02-15 | 1992-02-15 | Disc brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9203257D0 GB9203257D0 (en) | 1992-04-01 |
| GB2264154A true GB2264154A (en) | 1993-08-18 |
Family
ID=10710468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9203257A Withdrawn GB2264154A (en) | 1992-02-15 | 1992-02-15 | Disc brake |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2264154A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1086780C (en) * | 1995-11-06 | 2002-06-26 | 东机工株式会社 | Disk brake |
| EP2664814A1 (en) * | 2012-05-16 | 2013-11-20 | Wabco Radbremsen GmbH | Disc braking system, in particular for commercial vehicles, and holding device for a cable of such a disc braking system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3809009A4 (en) * | 2018-06-15 | 2022-03-16 | Hitachi Astemo, Ltd. | Vehicular disc brake |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB875158A (en) * | 1956-12-13 | 1961-08-16 | Automotive Prod Co Ltd | Improvements in or relating to disc brakes |
| GB935994A (en) * | 1958-07-10 | 1963-09-04 | Girling Ltd | Improvements relating to disc brakes |
| EP0139890A1 (en) * | 1983-08-31 | 1985-05-08 | Rockwell International Corporation | Friction pad and support for a disc brake |
-
1992
- 1992-02-15 GB GB9203257A patent/GB2264154A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB875158A (en) * | 1956-12-13 | 1961-08-16 | Automotive Prod Co Ltd | Improvements in or relating to disc brakes |
| GB935994A (en) * | 1958-07-10 | 1963-09-04 | Girling Ltd | Improvements relating to disc brakes |
| EP0139890A1 (en) * | 1983-08-31 | 1985-05-08 | Rockwell International Corporation | Friction pad and support for a disc brake |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1086780C (en) * | 1995-11-06 | 2002-06-26 | 东机工株式会社 | Disk brake |
| EP2664814A1 (en) * | 2012-05-16 | 2013-11-20 | Wabco Radbremsen GmbH | Disc braking system, in particular for commercial vehicles, and holding device for a cable of such a disc braking system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9203257D0 (en) | 1992-04-01 |
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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) |