GB2202287A - Disc brake - Google Patents
Disc brake Download PDFInfo
- Publication number
- GB2202287A GB2202287A GB08706732A GB8706732A GB2202287A GB 2202287 A GB2202287 A GB 2202287A GB 08706732 A GB08706732 A GB 08706732A GB 8706732 A GB8706732 A GB 8706732A GB 2202287 A GB2202287 A GB 2202287A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pin
- caliper
- sleeve
- disc
- disc brake
- 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.)
- Granted
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
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/54—Slack adjusters mechanical self-acting in one direction for adjusting excessive play by means of direct linear adjustment
-
- 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
- F16D55/22655—Constructional details of guide 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
- 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
- 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
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/007—Pins holding the braking members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
A disc brake includes a caliper assembly 11 having a pair of parallel limbs 16 (and 17, Fig. 1) which are interconnected at adjacent ends, one of said limbs 16 being provided with hydraulic actuating means 26, 27 which is movable transversely of the parallel limbs and a support member 12 by means of which the caliper assembly 11 may be mounted to a fixed part of a vehicle. The support member 12 has first and second spaced parallel pins 13 and 14, said first pin 13 slidably engaging in a bore 30 extending transversely of limb 16 of the caliper assembly 11. The second pin 14 extending transversely through an aperture 33 in the limb 16 of caliper assembly 11, said second pin 14 having a sleeve member 32, elastomeric brush means 41 being interposed between the sleeve member 32 and the wall of the aperture 33 to provide compliant location of the caliper assembly 11 with respect to the pin 14. The sleeve member 32 is located on the pin 14 in a manner which will permit limited longitudinal float of the sleeve member 32 relative to the pin 14. <IMAGE>
Description
DISC BRAKES
This invention relates to disc brakes particularly, but not exclusively, for braking the road wheels of vehicles.
Typically, a disc brake comprises a disc secured for rotation -with the road wheel of a vehicle, a caliper assembly which straddles a portion of the peripheral edge of the disc and a support member mounted on a fixed part of the vehicle, upon which the caliper is slidingly located for movement relative to the disc, in a direction parallel to the axis of rotation of the disc.
The caliper comprises a pair of parallel limbs which overlap and are parallel to the disc, these limbs being interconnected by a pair of transverse limbs which are spaced radially from the periphery of the disc. A pair of brake pads are located, one on either side of the disc, between the parallel limbs of the caliper. The brake pads comprise backing plates having pads of friction material on the faces thereof adjacent the disc. These pads are located radially by means of a pair of pins which extend between the parallel limbs of the caliper, outside the periphery of the disc, the pins passing through holes in the backing plates of the pads.The holes in the backing plates are elongate to permit the pads to move over a small distance circumferentially of the disc, so that when brought into engagement with the rotating disc, one of the radial edge faces of each backing plate will be brought into engagement with a corresponding radial face on the caliper, depending on the direction of rotation.
A hydraulic cylinder/piston assembly is associated with one of the parallel limbs of the caliper and arranged to act on the backing plate of the adjacent pad. Application of the brakes will cause the hydraulic piston to force the adjacent brake pad into engagement with the disc and then further pressure will cause the caliper to slide on the support member, thereby bringing the opposite pad into engagement with the disc.
On release of the brakes, seals associated with the hydraulic piston will "roll back" causing the piston to move back sufficiently to provide clearance for the adjacent pad and to permit the caliper to slide relative to the support member so that clearance is provided for the other pad. This movement of the caliper is caused by "knock-back" due to minor inaccuracies in the alignment of the disc relative to the plane in which it rotates.
The caliper may be mounted, with respect to the support, on a pair of pins. One pin is slidingly located on a bore in the caliper so that it will locate the caliper circumferentially relative to the disc and will take the brake reaction forces generated during braking. The other pin merely guides the caliper and in order to accommodate thermal expansion and manufacturing tolerances, elastomeric bush means is provided between the pin and a corresponding bore in he caliper to provide some compliance. If the bush arrangement is too soft, there will be insufficient guidance on one side of the caliper which would permit the caliper to twist and make sliding on the other pin difficult.If on the other hand the bush is too stiff, the resistance to sliding of the caliper on the guide pin will be too great and "knock-back" will result in damage to the brake pads, or further retraction of the piston rather than movement of the caliper, which will result in excessive clearance.
The present invention provides a disc brake in which the mounting of the caliper on the support, permits a limited degree of relatively free float of the caliper transversely of the disc to accommodate normal levels of out of true rotation of the disc, while providing adequate guidance of the caliper.
According to one aspect of the present invention, a disc brake includes a caliper having a pair of parallel limbs interconnected at adjacent ends, one of said limbs being provided with actuating means moveable transversely of the parallel limbs, and a support member by means of which the caliper may be mounted to a fixed part of a vehicle, said support member having first and second spaced parallel pins, said first pin slidingly engaging in a bore extending transversely of one of the parallel limbs of the caliper, the second pin extending transversely through an aperture in the limb of the caliper, said second pin having a sleeve member, elastomeric bush means being interposed between the sleeve member and the wall of the aperture to provide compliant location of the caliper with respect to the pin, said sleeve being located on the pin in a manner which will permit limited longitudinal float of the sleeve member relative to the pin.
With this arrangement, a limited free movement of the sleeve on the pin will permit limited float of the caliper, transverse the brake disc, to accommodate the normally occurring out of true rotation of the brake disc. Further transverse movement of the caliper, for example upon tight cornering manoeuvres causing excessive out of true rotation of the disc due to bending of the stub axle, will be permitted by sliding of the elastomeric bush means relative to the sleeve.
An embodiment of the invention is now described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 illustrates in elevation, a disc brake formed in accordance with the present invention;
Figure 2 is a part sectional plan vieo of the disc brake illustrated in figure 1; and
Figure 3 shows an enlarged view of part of the disc brake illustrated in figure 1.
As illustrated in figures 1 to 3, the disc brake comprises aisc 10 nounted for rotation with a road wheel (not shown). A caliper assembly 11 straddles a portion of the periplleral edge of the disc 10, the caliper 11 havina a pair of radially extending parallel limbs 16 and 17 which overlap and are parallel to the disc 10, these lints being interconnected at opposed ends thereof by a pair of transverse limbs which are spaced radially of the periphery of the disc 10. A hydraulic cylinder/piston assembly 26, 27 forms part of the limb 16 of the caliper assembly 11, the piston 27 being arranged to move in and out of tle cylinder 26 in a direction parallel to the axis of rotation of disc 10.
The caliper assembly 11 is mounted with respect to disc 10 on support member 12 which may be secured to a fixed part of the vehicle by means, for example, of bolts which pass through holes 15. As shown in figure 2, the support member 12 has a pair parallel pins 13 and 14, which extend parallel to the axis of rotation of disc 10. Pin 13 slidably engages in a bore 30 in limb 16 of the caliper assembly 11 and locates the caliper circumferentially relative to the disc 10, while permitting movement of the caliper 11 transversely of the disc 10.
As illustrated in greater detail in figure 3, pin 14 is provided with a circumferential groove 31 extending longitudinally intermediate of its ends. A sleeve 32 of low friction material, for example PTFE or nylon, is located in the groove, the sleeve 32 being split longitudinally to permit location thereof in the groove 31. The length of the sleeve 32 is less than that of the groove 31, so that the sleeve 32 is free to float on the pin 14 by a limited amount (typically of the order of 0.5mm).
The pin 14 extends through an aperture 33 in limb 16 of caliper 11. A rubber boot 40 is located through the aperture 33 and is secured therein, by means of a pair of longitudinally spaced circumferential formations 43. The rubber boot 40 has a series of ribs 41 which are located between the wall of the aperture 33 and sleeve 32 and provide compliant location of the caliper 11 on the pin 14, which prevents rotation of caliper 11 about the axis of pin 13. This compliance will accommodate any manufacturing tolerances in the separation of pins 13 and 14 or of bore 30 and aperture 33 and will also permit thermal expansion of the caliper 11 and/or support member 12.
A pair of brake pad; 18 and 19 are located on either side of the disc 10 between the parallel limbs 16 and 17 of the caliper assembly 11. The brake pads 18 and 1 each comprise a backing plate 20 having a pad of friction material 21 on the face thereof adjacent disc 10. The pads 18 and 19 are located radially by means of a pair of pins 22 which extend between the parallel limbs 16 and 17 outside the periphery of the disc 10, the pins 22 passing through holes 23 in the backing plates 20.The holes 23 are elongate to permit the pads 18 and 19 to move over a small distance circumferentially relative to the disc 10, so that when brought into engagement with the rotating disc 10, the pads 18 and 19 will be dragged along by the disc 10, until one of the radial faces 24 on the backing plate 20 of each pad 18 and 19, are brought into engagement with a corresponding radial faces 25 on the caliper assembly 11. The pad 18 is secured for movement with the piston 27 by means of a spring clip 28 mounted on the rear face of the backing plate 18. A further spring clip 29 is provided to maintain pad 19 in engagement with limb 17 of the caliper assembly 11.
Upon actuation of the brakes, hydraulic pressure is applied to the piston 27 which urges the pad 18 into engagement with one face of disc 10. Further application of pressure by piston 27 causes the caliper assembly 11 to slide on pin 13 so that limb 16 will move away from tie disc 10. This movement brings limb 17 of the caliper towards the disc 10 so that pad 18 will engage the opposite face of disc 10.
The resulting brake reaction forces are transmitted through the caliper 11 to pin 13 and then through the support member 12 to the vehicle chassis.
Upon release of the brakes, "roll back" of the seals between the piston 27 and cylinder 26 cause the piston to move back away from the disc 10 and this draws back pad 18 to provide clearance between pad 18 and the disc 10. The clearance between sleeve 32 and the groove 31 then permits the caliper 11 to float by limited amount relative to the disc 10 and "knock back" caused by the out of true running tolerances of the disc 10 moves pad 19 clear of the disc.
If out of true running of the disc 10 should be greater than the normal tolerances, due for example to bending of the stub axle during a heavy cornering manoeuvres, the limited frictional engagement between the ribs 41 on the rubber boot 40 and the low friction sleeve 32, will permit further transverse movement of the caliper 11 relative to the disc 10 thereby avoiding damage to the pads 18 or 19.
Claims (7)
1. A disc brake including a caliper having a pair of parallel limbs interconnected at adjacent ends, one of said limbs being provided with actuating means moveable transversely of the parallel limbs, and a support member by means of which the caliper may be mounted to a fixed part of a vehicle, said support member having first and second spaced parallel pins, said first Fin slidingly engaging in a bore extending transversely of one of the parallel limbs of the caliper, the second pin extending transversely through an aperture in the limb of the caliper, said second pin having a sleeve member, elastomeric bush means being interposed between the sleeve member and the wall of the aperture to provide compliant location of the caliper with respect to the pin, said sleeve being located on the pin in a manner which will permit limited longitudinal float of the sleeve member relative to the pin.
2. A disc brake according to Claim 1 in which the sleeve is located in a circumferential grove intermediate of the end of the pin and the support member, the length of the groove being greater than the length of the sleeve.
3. A disc brake according to Claim 1 or 2 in which the float of the sleeve member relative to the pin is of the order of 0.5mm.
4. A disc brake according to any one of Claims 1 to 3 in which the sleeve is split longitudinally.
5. A disc brake according to any one of the preceding claims in which the sleeve is made from a material of low frictional coefficient.
6. A disc brake according to Claim 5 in which the sleeve is made of PTFE or nylon.
7. A disc brake, substantially as described herein, with reference to, and as shown in, Figures 1 to 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8706732A GB2202287B (en) | 1987-03-20 | 1987-03-20 | Disc brakes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8706732A GB2202287B (en) | 1987-03-20 | 1987-03-20 | Disc brakes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8706732D0 GB8706732D0 (en) | 1987-04-23 |
| GB2202287A true GB2202287A (en) | 1988-09-21 |
| GB2202287B GB2202287B (en) | 1991-03-20 |
Family
ID=10614364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8706732A Expired - Lifetime GB2202287B (en) | 1987-03-20 | 1987-03-20 | Disc brakes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2202287B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5040642A (en) * | 1989-01-28 | 1991-08-20 | General Motors France | Disc brake and cap seal therefor |
| WO1995018928A1 (en) * | 1994-01-07 | 1995-07-13 | Alliedsignal Europe Services Techniques | Disc brake with improved caliper return |
| DE102007001213A1 (en) * | 2007-01-05 | 2008-07-10 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Disc brake, in particular for a commercial vehicle |
| DE102021117359A1 (en) | 2021-07-06 | 2023-01-12 | Zf Cv Systems Europe Bv | Disc brake with a pin guide for vehicles, in particular for commercial vehicles |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2037385A (en) * | 1978-11-16 | 1980-07-09 | Akebono Brake Ind | Caliper mounitn arrangement for a disc brake assembly |
| EP0033276A1 (en) * | 1980-01-28 | 1981-08-05 | The Bendix Corporation | Disc brake assembly |
| EP0076729A1 (en) * | 1981-10-02 | 1983-04-13 | Allied Corporation | Disc brake |
-
1987
- 1987-03-20 GB GB8706732A patent/GB2202287B/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2037385A (en) * | 1978-11-16 | 1980-07-09 | Akebono Brake Ind | Caliper mounitn arrangement for a disc brake assembly |
| EP0033276A1 (en) * | 1980-01-28 | 1981-08-05 | The Bendix Corporation | Disc brake assembly |
| EP0076729A1 (en) * | 1981-10-02 | 1983-04-13 | Allied Corporation | Disc brake |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5040642A (en) * | 1989-01-28 | 1991-08-20 | General Motors France | Disc brake and cap seal therefor |
| WO1995018928A1 (en) * | 1994-01-07 | 1995-07-13 | Alliedsignal Europe Services Techniques | Disc brake with improved caliper return |
| FR2714945A1 (en) * | 1994-01-07 | 1995-07-13 | Alliedsignal Europ Services | Improved reverse disc brake. |
| CN1069745C (en) * | 1994-01-07 | 2001-08-15 | 联合信号欧洲技术股务公司 | Disk brake with improved return |
| DE102007001213A1 (en) * | 2007-01-05 | 2008-07-10 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Disc brake, in particular for a commercial vehicle |
| DE102007001213B4 (en) * | 2007-01-05 | 2008-09-04 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Disc brake, in particular for a commercial vehicle |
| US8944221B2 (en) | 2007-01-05 | 2015-02-03 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Disk brake for a commercial vehicle |
| DE102021117359A1 (en) | 2021-07-06 | 2023-01-12 | Zf Cv Systems Europe Bv | Disc brake with a pin guide for vehicles, in particular for commercial vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2202287B (en) | 1991-03-20 |
| GB8706732D0 (en) | 1987-04-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940320 |