GB2551855B - Sliding caliper disc brake - Google Patents
Sliding caliper disc brake Download PDFInfo
- Publication number
- GB2551855B GB2551855B GB1619385.6A GB201619385A GB2551855B GB 2551855 B GB2551855 B GB 2551855B GB 201619385 A GB201619385 A GB 201619385A GB 2551855 B GB2551855 B GB 2551855B
- Authority
- GB
- United Kingdom
- Prior art keywords
- bush
- guide
- bore
- recess
- sliding
- 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 - Fee Related
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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Description
SLIDING CALIPER DISC BRAKE
The present invention relates to a sliding caliper disc brake for a vehicle, and particularly but not exclusively to a disc brake for use with a compressed air braking system.
BACKGROUND A sliding caliper disc brake is mounted to a vehicle so that it can move axially relative to the brake disc, to allow clamping force reaction and also to compensate for pad and disc wear over time. Typically, a brake carrier is mounted in a fixed position on the vehicle, and the caliper in turn is attached to the brake carrier by means of a sliding guide bearing. The guide bearing comprises a guide pin and a guide bush, and the external surface of the guide pin slides against the internal surface of the guide bush.
To ensure smooth sliding of the caliper, usually two guide bearings are provided, i.e. two pins and two corresponding guide bushes. One of the guide bearings is a “fixed” bearing, typically with a round guide pin and a close fitting round bush, so that the guide pin can slide axially in the bush, but cannot move in any other direction. The other guide bearing is a “loose” bearing, with a round guide pin but a non-circular (e.g. oval) guide bush. This allows the guide pin to move slightly in a line perpendicular to the axial direction, towards I away from the other (fixed) bearing. The guide pin is still closely restrained in the other direction, i.e. the direction orthogonal to both the axial sliding direction and the direction towards / away from the fixed bearing.
The system of a fixed bearing and a loose bearing allows smooth sliding, despite deformation of the caliper due to heavy loading in operation, or dimensional tolerance effects that could lead to sliding issues. This is described in more detail in “The Introduction of Air Disc Brakes for Trucks and Buses in Europe”, SAE Technical Paper ISSN 0148-7191 (1990).
The “oval bush” is generally a good solution during operation of the brake. In assembly line production it is possible to closely control the process so that the oval bush of the loose bearing is always installed to allow deflection along the correct line. However, the guide bushes will generally need to be replaced during the normal lifetime of the brake, due to wear, and problems can arise if a replacement bush is not correctly aligned. The oval shape of the bush is visually very subtle, and it is easy to install a guide bush in an incorrect orientation. This will lead to brake rattle, and also subject the new bush to a large amount of wear, decreasing its working lifespan.
It is also possible that, under extreme loading, a bush will move out of alignment once fitted. The bush might move either rotationally or axially. Various ways of preventing this have been proposed, for example in the Meritor ELSA1 brake, rotational restraint is provided by “staking” I “peening” parts of the bush into a recess in the caliper bore, at the end of the bush. This also provides axial restraint but only in one direction. Axial restraint in the other direction is provided only by a press-fit protective end cap, which has a relatively low restraint load.
The Knorr Bremse SK7 brake provides rotational and axial retention in both directions by deforming a fixing element into a recess in the interior wall of the caliper bore. However, the recess is a cast feature and due to manufacturing tolerances there must be a clearance between the fixing element and the walls of the recess. There is therefore some potential for a small amount of rotational and/or axial movement of the bush.
It is an object of the invention to reduce and/or obviate the above mentioned problems.
STATEMENT OF INVENTION
According to the present invention, there is provided a sliding caliper disc brake for a commercial vehicle, the brake including a brake caliper arranged to slide relative to a brake carrier on guide bearings, at least two guide bearings being provided, and each guide bearing comprising a guide pin and a guide bush, the external surface of the guide pin sliding against the internal surface of the guide bush in use, and the bush being fitted within a bore, one of the guide bearings being a fixed bearing which allows sliding of the guide pin relative to the guide bush in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush, and one of the guide bearings being a loose bearing in which the guide pin is allowed to move in a radial direction towards and away from the fixed bearing as well as sliding in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush in a direction perpendicular to the direction towards I away from the fixed bearing, characterised in that a recess is provided in the bore corresponding to the loose bearing, the recess being covered by the guide bush of the loose bearing, and the guide bush of the loose bearing being retained in the bore by deforming part of the wall of the guide bush into the recess by piercing the wall, preventing any rotational or axial movement of the guide bush in the bore.
Typically, the bore is provided in the caliper and the guide pins are attached to the brake carrier, although in principle in some embodiments the pin may be attached to the caliper with the bush and the bore on the brake carrier.
By covering the recess with the guide bush, the wall of the bush can be deformed so that parts of the wall press against the recess, substantially all the way around the recess, holding the bush in the bore and substantially preventing axial or rotational movement of the bush in any direction.
Preferably, an alignment formation is provided in the bush, for visually aligning with the recess in the bore when fitting a new bush. The alignment formation may be in the form of a notch. The alignment formation may be provided in an end of the bush, preferably the leading end of the bush, i.e. the end of the bush which is inserted into the bore first, when the bush is being fitted. The alignment formation will in that case pass over the recess, where alignment can be observed by eye, and then beyond the recess so that the recess is completely covered by the wall of the bush when fully inserted.
In some embodiments, a further alignment formation is provided on the trailing end of the bush. This alignment formation is most suitable for machine alignment during factory assembly, rather than visual alignment during servicing. Preferably, the further alignment formation on the trailing end of the bush is provided on the opposite side to the alignment formation on the leading end of the bush.
Preferably, a shoulder is provided at a far end of the bore (i.e. the opposite end to the end from which the bush is inserted). The shoulder provides a stop to prevent the bush from being pushed any further along the bore. In this way, exact positioning in the axial direction is ensured. As the bush is pushed towards the shoulder, the alignment formation in the leading end can be observed and aligned exactly with the recess in the bore, if necessary by rotating the bush until the two are aligned. Typically, the notch is exactly the same width as the recess so that the edges of the notch and recess can be aligned exactly. However, it may be preferable in some embodiments to make the notch width slightly larger than the recess so that all of the recess can always be seen through the notch, bearing in mind that the recess will typically be a cast part and may be subject to larger manufacturing tolerances than the bush.
When the bush is pressed fully against the shoulder and it will not move any further, the bush is deformed in a position corresponding to the recess in the bore. A sharp tool is used to pierce the wall of the bush. Parts of the pierced bush will press against walls of the recess in the bore, extending to the extremities of the recess, to prevent any movement of the bush relative to the bore, in any direction.
The recess is covered by the guide bush in the sense that parts of the guide bush surround the recess on all sides, when fitted.
According to another aspect of the invention, there is provided a method of installing a guide bush within a bore in a sliding caliper disc brake, the brake including a brake caliper and a brake carrier, the brake caliper and brake carrier being arranged to slide relative to each other on guide bearings, at least two guide bearings being provided, and each guide bearing comprising a guide pin and a guide bush, the external surface of the guide pin sliding against the internal surface of the guide bush in use, and the bush being fitted within a bore, one of the guide bearings being a fixed bearing which allows sliding of the guide pin relative to the guide bush in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush, and one of the guide bearings being a loose bearing in which the guide pin is allowed to move in a radial direction towards and away from the fixed bearing as well as sliding in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush in a direction perpendicular to the direction towards I away from the fixed bearing, the method including the steps of: providing a recess in the bore corresponding to the loose bearing, inserting the loose bearing guide bush into the bore, so that the guide bush covers the recess, deforming by piercing part of the wall of the guide bush into the recess, to prevent any rotational or axial movement of the guide bush in the bore.
The wall of the guide bush may be deformed by pressing the wall from the inside of the bush, for example using a centrepunch. The deformation involves piercing through the wall.
Preferably, an alignment formation is provided in the bush, and the method includes the step of visually aligning the alignment formation of the bush with the recess of the bore, as the bush is being inserted into the bore.
Preferably, a shoulder is provided at a far end of the bore (i.e. the opposite end to the end from which the bush is inserted). The shoulder provides a stop to prevent the bush from being pushed any further along the bore. The method may include the step of inserting the bush into the bore by pushing the bush axially into the bore until the bush meets the shoulder.
DESCRIPTION OF THE DRAWINGS
For a better understanding of the invention, and to show more clearly how it may be carried into effect, a preferred embodiment will now be described with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of a bush ready to be fitted into a bore; and
Figure 2 is a perspective view of the bush and bore of Figure 1, with the bush fitted into the bore.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring firstly to Figure 1, part of a brake caliper is indicated at 10. In the drawings, most of the caliper is not shown and only the shape of the bore is indicated. A caliper will typically include two such bores, a sliding bearing being provided with each one. The sliding bearing comprises a guide bush and a guide pin. One of the sliding bearings is a “fixed” bearing, where the guide bush is shaped to closely correspond to the guide pin so that the pin can only slide axially, and cannot move in any radial direction. However, the sliding bearing which is the subject of the present invention is the “loose” bearing, in which the guide bush is non-circular, to allow the guide pin to move slightly radially in one direction, typically along the line running between the two guide pins.
The bore 12 of the caliper 10 is substantially circular in profile. Therefore, to provide the loose bearing a guide bush 14 is provided which has a non-circular cross-section. In particular, the guide bush 14 has a slightly greater interior extent along the axis marked A than it does along the axis marked B. The outside profile of the guide bush is substantially circular, having substantially equal extent along both axes A and B, to correspond with the bore 12 in the caliper 10.
As is evident from the drawings, the non-circular profile on the interior of the guide bush 14 is very slight, so it is difficult to identify visually. A shoulder 16 is provided all the way around the inner surface of the bore 12, near the end of the bore. The shoulder defines a stepped inner surface of the bore 12, and defines a stop to prevent movement into the bore 12 beyond the shoulder in a direction out of the page in the drawings. A recess 18 is provided in the interior surface of the bore. The recess is approximately square, and positioned in this embodiment with its centre substantially on a line passing between the centres of the two bores of the caliper. The axial position of the recess within the bore is such that, when the bush 14 is inserted into the bore 12, the recess 18 is completely covered by the bush 14.
To assist with aligning the bush 14 correctly, a notch 20 is provided in a leading end of the bush. The notch is positioned to be in line with the recess 18 when the bush 14 is in exactly the correct orientation, which is with the long axis A of the bush 14 on a line passing between the centres of the two bores of the caliper. A further notch 22 is provided on the trailing end of the bush 14. The notch 22 is provided on the opposite side of the bush 14 from the notch 20, so that the long axis A of the bush 14 passes through the centres of both notches 20, 22. The further notch 22 is for mating with a corresponding formation on an assembly line tool, allowing automatic and precise alignment of the bush during factory production.
Figure 2 shows the same bore 12 and bush 14, with the bush 14 fitted into the bore 12. The bush 14 as shown in Figure 1 is simply pushed into the bore 12, in the direction of arrow C, until it meets the shoulder 16, when in the position as shown in Figure 2. To fix the bush 14 in the bore 12 and prevent any further movement, axially or rotationally, the wall of the bush 14 is deformed from the inside, for example using a centrepunch or similar tool, into the recess 18. The deformation 24 preferably puts the outside wall of the bush 14 into contact with inside walls of the recess 18, substantially all the way around the recess to prevent any movement at all.
Staking the bush 14 in the bore 12 according to the invention is easy to do in a field repair situation, not relying on specialist tools to achieve precise alignment. It therefore avoids the problems of excess noise and excess wear which are associated with imprecisely fitted guide bushes.
The embodiments described above are provided byway of example only, and various changes and modifications will be apparent to persons skilled in the art without departing from the scope of the present invention as defined by the appended claims.
Claims (10)
1. A sliding caliper disc brake for a commercial vehicle, the brake including a brake caliper arranged to slide relative to a brake carrier on guide bearings, at least two guide bearings being provided, and each guide bearing including a guide pin and a guide bush, the external surface of the guide pin sliding against the internal surface of the guide bush in use, and the bush being fitted within a bore, one of the guide bearings being a fixed bearing which allows sliding of the guide pin relative to the guide bush in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush, and one of the guide bearings being a loose bearing in which the guide pin is allowed to move in a radial direction towards and away from the fixed bearing as well as sliding in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush in a direction perpendicular to the direction towards I away from the fixed bearing, characterised in that a recess is provided in the bore corresponding to the loose bearing, the recess being covered by the guide bush of the loose bearing, and the guide bush of the loose bearing being retained in the bore by deforming part of the wall of the guide bush into the recess by piercing the wall, preventing any rotational or axial movement of the guide bush in the bore.
2. A sliding caliper disc brake as claimed in claim 1, in which an alignment formation is provided on the bush, for visually aligning with the recess in the bore when fitting the bush.
3. A sliding caliper disc brake as claimed in claim 2, in which the alignment formation is a notch.
4. A sliding caliper disc brake as claimed in claim 3, in which the notch is wider than a corresponding dimension of the recess to allow the full extent of the recess in at least one direction to be visible through the notch.
5. A sliding caliper disc brake as claimed in any of claims 2 to 4, in which the alignment formation is provided in an end of the bush.
6. A sliding caliper disc brake as claimed in any of the preceding claims, in which a shoulder is provided on the interior surface of the bore, the shoulder providing a stop to prevent axial travel of the bush beyond the shoulder.
7. A method of installing a guide bush within a bore in a sliding caliper disc brake, the brake including a brake caliper and a brake carrier, the brake caliper and brake carrier being arranged to slide relative to each other on guide bearings, at least two guide bearings being provided, and each guide bearing comprising a guide pin and a guide bush, the external surface of the guide pin sliding against the internal surface of the guide bush in use, and the bush being fitted within a bore, one of the guide bearings being a fixed bearing which allows sliding of the guide pin relative to the guide bush in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush, and one of the guide bearings being a loose bearing in which the guide pin is allowed to move in a radial direction towards and away from the fixed bearing as well as sliding in an axial direction, but which substantially prevents any radial movement of the guide pin relative to the guide bush in a direction perpendicular to the direction towards I away from the fixed bearing, the method including the steps of: providing a recess in the bore corresponding to the loose bearing, inserting the loose bearing guide bush into the bore, so that the guide bush covers the recess, deforming by piercing part of the wall of the guide bush into the recess, to prevent any rotational or axial movement of the guide bush in the bore.
8. A method of installing a guide bush within a bore as claimed in claim 7, in which the wall of the guide bush is deformed by piercing the wall from the inside of the bush.
9. A method of installing a guide bush within a bore as claimed in claim 7 or claim 8, in which an alignment formation is provided in the bush, and the method includes the step of visually aligning the alignment formation of the bush with the recess of the bore, as the bush is being inserted into the bore.
10. A method of installing a guide bush within a bore as claimed in any of claims 7 to 9, in which a shoulder is provided around an interior surface of the bore, and the method includes the step of inserting the bush into the bore by pushing the bush axially into the bore until the bush meets the shoulder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1619385.6A GB2551855B (en) | 2016-11-16 | 2016-11-16 | Sliding caliper disc brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1619385.6A GB2551855B (en) | 2016-11-16 | 2016-11-16 | Sliding caliper disc brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2551855A GB2551855A (en) | 2018-01-03 |
| GB2551855B true GB2551855B (en) | 2019-08-14 |
Family
ID=60570994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1619385.6A Expired - Fee Related GB2551855B (en) | 2016-11-16 | 2016-11-16 | Sliding caliper disc brake |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2551855B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3859181A1 (en) * | 2020-02-03 | 2021-08-04 | Meritor Heavy Vehicle Braking Systems (UK) Limited | Guide assembly |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3229924A1 (en) * | 1982-08-11 | 1984-02-16 | Alfred Teves Gmbh, 6000 Frankfurt | Pin guide, in particular floating calliper guide for disc brakes |
| GB2145787A (en) * | 1983-09-02 | 1985-04-03 | Teves Gmbh Alfred | Spot-type disc brake fixing a guide element |
| WO2003025413A1 (en) * | 2001-09-18 | 2003-03-27 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Disc brake, in particular for a utility vehicle |
| US20070029147A1 (en) * | 2003-03-18 | 2007-02-08 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Disk brake, especially for commercial vehicles |
| US20090200122A1 (en) * | 2006-04-25 | 2009-08-13 | Lars Bagge | Sliding arrangement for a disk brake |
| WO2009151353A1 (en) * | 2008-06-13 | 2009-12-17 | Volvo Construction Equipment Ab | Disc brake for a vehicle and vehicle comprising a disc brake |
| US20130126280A1 (en) * | 2011-11-22 | 2013-05-23 | Akebono Corporation | Single abutment caliper |
-
2016
- 2016-11-16 GB GB1619385.6A patent/GB2551855B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3229924A1 (en) * | 1982-08-11 | 1984-02-16 | Alfred Teves Gmbh, 6000 Frankfurt | Pin guide, in particular floating calliper guide for disc brakes |
| GB2145787A (en) * | 1983-09-02 | 1985-04-03 | Teves Gmbh Alfred | Spot-type disc brake fixing a guide element |
| WO2003025413A1 (en) * | 2001-09-18 | 2003-03-27 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Disc brake, in particular for a utility vehicle |
| US20070029147A1 (en) * | 2003-03-18 | 2007-02-08 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Disk brake, especially for commercial vehicles |
| US20090200122A1 (en) * | 2006-04-25 | 2009-08-13 | Lars Bagge | Sliding arrangement for a disk brake |
| WO2009151353A1 (en) * | 2008-06-13 | 2009-12-17 | Volvo Construction Equipment Ab | Disc brake for a vehicle and vehicle comprising a disc brake |
| US20130126280A1 (en) * | 2011-11-22 | 2013-05-23 | Akebono Corporation | Single abutment caliper |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2551855A (en) | 2018-01-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20180816 AND 20180822 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20221116 |