GB2395760A - Drum brake camshaft arrangement having at least one ceramic coating - Google Patents
Drum brake camshaft arrangement having at least one ceramic coating Download PDFInfo
- Publication number
- GB2395760A GB2395760A GB0227452A GB0227452A GB2395760A GB 2395760 A GB2395760 A GB 2395760A GB 0227452 A GB0227452 A GB 0227452A GB 0227452 A GB0227452 A GB 0227452A GB 2395760 A GB2395760 A GB 2395760A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bearing
- drum brake
- brake camshaft
- camshaft
- journal
- 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
- 238000005524 ceramic coating Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005461 lubrication Methods 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 210000002445 nipple Anatomy 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000007750 plasma spraying Methods 0.000 claims description 2
- 239000004519 grease Substances 0.000 description 16
- 238000000576 coating method Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 6
- 238000003754 machining Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- IUVCFHHAEHNCFT-INIZCTEOSA-N 2-[(1s)-1-[4-amino-3-(3-fluoro-4-propan-2-yloxyphenyl)pyrazolo[3,4-d]pyrimidin-1-yl]ethyl]-6-fluoro-3-(3-fluorophenyl)chromen-4-one Chemical compound C1=C(F)C(OC(C)C)=CC=C1C(C1=C(N)N=CN=C11)=NN1[C@@H](C)C1=C(C=2C=C(F)C=CC=2)C(=O)C2=CC(F)=CC=C2O1 IUVCFHHAEHNCFT-INIZCTEOSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
-
- 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
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
-
- 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
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/28—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged apart from the brake
-
- 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
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
- F16D2125/28—Cams; Levers with cams
- F16D2125/30—Cams; Levers with cams acting on two or more cam followers, e.g. S-cams
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Braking Arrangements (AREA)
Abstract
A drum brake camshaft arrangement including a drum brake camshaft (20, fig 1) having a journal surface 76, and a bearing having a bearing surface 68 in contact with the journal surface 76, in which one or both of the journal surface 76 and the bearing surface 68 has a ceramic coating 88. A method of repairing a drum brake camshaft 20 by applying a ceramic coating to a worn journal surface is also disclosed.
Description
1 2395760
P303209GB
Drum brake Camshaft Arrangement The present invention relates to a drum brake camshaft arrangement, in particular to a drum brake camshaft arrangement with ceramic coated components, especially for use on heavy commercial road vehicles.
Known drum brake assemblies for heavy commercial road vehicles include a brake drum, brake shoes, and a camshaft arrangement which includes an Sshaped cam arranged to cam against a roller mounted on each brake shoe. The camshaft arrangement includes a bearing located inside a housing, and a camshaft with a journal supported by the bearing. The camshaft is driven by an actuator, typically an air actuator, which rotates the camshaft so as to effect braking by forcing each brake shoe against the brake drum.
Rotation of the camshaft in the bearing results in wear to both the journal and the bearing surface in contact with the journal. This is problematic in that wear to the components can result in ineffective operation of the arrangement, and potential failure, scenarios which cannot be contemplated for safety critical parts such as brakes.
To reduce wear, the camshaft journal is surface hardened, for example, by induction hardening. To further reduce camshaft journal and bearing surface wear, lubrication, typically grease, is applied between the camshaft journal and the bearing surface via a lubrication point on the bearing, such as a grease nipple.
However, despite hardening the camshaft journal, regular lubrication is still required between the journal and the bearing. This is undesirable since customers are demanding wider maintenance schedules. Furthermore the need to apply lubrication to the bearing surface requires lubrication points, which increases both component and process costs.
An object of the present invention is to provide an improved drum brake camshaft arrangement.
Thus according to the present invention there is provided a drum brake camshaft arrangement comprising a drum brake camshaft having a journal surface, and a bearing having a bearing surface in contact with the camshaft journal surface, in which one or both of the journal surface and the bearing surface has a ceramic coating.
Advantageously this reduces wear of the camshaft journal and the bearing surface.
A further advantage of using a ceramic coating is the increased corrosion resistance compared to known drum brake camshaft journal and bearing materials.
In one embodiment there is no lubrication between the camshaft journal and the bearing surface. Thus it is not necessary to provide lubrication points on the drum brake camshaft arrangement, thereby eliminating the requirement for holes and grooves to be provided on the bearing and the requirement for grease seals. Thus the number of components, machining time, and assembly time is reduced. Furthermore, significantly less maintenance is required compared to known drum brake camshaft arrangements.
Preferably both the journal and the bearing surface have a ceramic coating, and thus wear is further reduced.
According to a second aspect of the present invention there is provided a drum brake camshaft bearing having a bearing surface for contact with an associated camshaft journal, in which the bearing surface has a ceramic coating.
in one form, a drum brake camshaft bearing arrangement is provided which includes a housing and a bearing according to the second aspect of the present invention.
Preferably the housing is integral with the bearing. By providing a one piece bearing/housing, the number of components is reduced.
According to a third aspect of the present invention there is provided a drum brake camshaft having a journal surface in which the journal surface has a ceramic coating.
According to a fourth aspect of the present invention there is provided a method of repairing a drum brake camshaft, including the steps of providing a drum brake camshaft with a worn journal surface, and then applying a ceramic coating to the worn journal surface. According to a filth aspect of the present invention there is provided a method of repairing a drum brake camshaft bearing, including the steps of providing a drum brake camshaft bearing with a worn bearing surface, and then applying a ceramic coating to the worn bearing surface.
Advantageously this allows the repair of a worn camshaft journal and/or bearing, without the need for replacement. The worn camshaft journal and/or bearing can be known, i.e. having a steel surface, or it can have a ceramic coating according to the present invention which has worn.
The invention will now be described, by way of non-limiting example, with reference to the accompanying drawings, in which: Figure I is a sectional front view ol a rear axle arrangement including a drum brake camshaft arrangement according to the present invention, Figure 2 is a perspective view of the drum brake camshaft arrangement of figure 1, Figure 3 is an exploded perspective view of part of the drum brake camshaft arrangement offigure 1, Figure 4 is an exploded perspective view of part of the rear axle arrangement of figure 1, Figure 5 is an enlarged sectional front view of the drum brake camshaft arrangement of figure I,
Figure 6 is an enlarged sectional front view of the drum brake camshaft bearing of the drum brake camshaft arrangement of figure 1, Figure 7 is an enlarged sectional front view of the drum brake camshaft of the drum brake camshaft arrangement of figure I, Figure 8 is an enlarged sectional front view of an alternative drum brake camshaft arrangement according to the present invention, Figure 9 is an enlarged schematic view of the drum brake camshaft arrangement of figure 8, and Figure 10 is an enlarged sectional front view of an alternative drum brake camshaft arrangement according to the present invention.
With reference to figures I and 2 there is shown a vehicle rear axle arrangement 10, which includes a rear axle 12 and a drum brake assembly 14.
The drum brake assembly 14 includes a brake drum 16 and a drum brake camshaft arrangement 18 having a drum brake camshaft 20 and a drum brake camshaft bearing assembly 25. The drum brake camshaft bearing assembly 25 has a drum brake bearing housing 21 and a drum brake camshaft bearing 22. Both the bearing and the camshaft are made from steel, but with the camshaft having a ceramic coating on its journal as further described below.
The drum brake assembly 14 further includes a pair ol' opposing brake shoes 24, with each brake shoe having a pair of radially extending webs 26 (figure 4).
A bracket 28 is provided on and welded to the rear axle 12, the bracket having two holes 30 at its top end 32 and a single hole 34 at its bottom end 36. Pins 38 pass through the two holes 30, with reduced diameter ends 39 of pins 38 locating onto corresponding recesses 40 at adjacent free ends 42 of the opposing brakes shoes 24 so as to locate the free ends 42 of
both brake shoes. Each pair of webs 26 has a recess 44 provided at the other free ends 46 onto which a reduced diameter portion 48 of a onepiece cam roller 50 locates. In other embodiments, the cam roller is a three piece arrangement incorporating a pin, a phospor-bronze bush, and an outer roller.
The cam roller 50 is retained in the recess by a clip 52 having holes 53 through which the reduced diameter portion 48 passes, the clip 52 being secured to the webs 26 by a pin (not shown) passing through apertures 56 on the clip and corresponding apertures 58 on the webs 26. The opposing brake shoes 24 are retained by springs 60 which locate on pins 54 (only one shown) which sits in holes 61 at both free ends 42,46 of opposing brake shoes 24 such that the brake shoes are biased away from the braking surface of the drum.
The bearing housing 21 is fixed to bracket 28 via screws 62 passing through corresponding holes 64,66 in the bearing housing and the bracket such that the bearing 22 is coaxially aligned with the single hole 34 at the bottom of the bracket (figure 3). The bearing has an inside bearing surface 68.
l'he camshaft 20 locates inside the bearing 22 such that it is supported by the bearing surface 68. The camshaft 20 has an S-shaped cam 70 provided at a first end 72 (left hand end when viewing figuec 1) and a journal 74, which is adjacent the S-shaped cam. The journal 74 has a journal suri'ace 76.
A second end 77 of the camshaft 20 is supported by a bracket 78 which is welded to the rear axle 12. The camshai'L 20 has a splined portion 80 at the second end 77, onto which actuation means (not shown), for example, air actuation, engage so as to rotatably drive the camshaft 20.
With the camshaft 20 supported at both ends, the S-shaped cam 70 sits between the cam roller 50 of each brake shoe 24.
The bearing housing 21 includes lubrication supply means in the form of a grease nipple 82 which enables grease to be supplied to the bearing.
The bearing 22 also includes lubrication distribution means in the form of cross holes 87 drilled radially through the bearing which allows grease supplied to the bearing by the grease nipple 82 to enter the region between the camshaft journal surface 76 and the bearing surface 68 (figure 5). The bearing includes further lubrication distribution means in the form of a circumferential groove 89 located on the bearing surface, the groove providing a path for grease to travel from the grease nipple to the cross holes in the event that the holes are not aligned with the grease nipple.
The camshaft arrangement 18 includes grease seals 84 located around the camshaft either side of the bearing to retain grease between the journal surface and the bearing surface. The camshaft arrangement 18 also includes dust seals 86 located adjacent the grease seals to prevent dust from contaminating the region between the journal surface and the bearing surface. Seals 84,84 are best seen in figure 3. The camshaft arrangement 18 also includes an elastomeric boot 85 to cover the dust and grease seals.
A ceramic coating 88, for example A1:Oa (alumina) is applied to the journal surface 76 (figure 5). The ceramic coating 88 is applied around the entire circumference of the journal over a longitudinal distance X,. Typically, the thickness of the coating is 0.3 mm. Figures 6 and 7 show the bearing 22 and camshaft 20 unassembled to show more clearly the surfaces described in relation to figure 5.
In operation, the actuation means drives the camshaft 20 such that it rotates and the S-shaped cam 70 cams against the cam roller 50 on each opposing brake shoe 24 to force each brake shoe 24 against the brake drum 16 so as to effect braking. Since the ceramic coating 88 has a higher surface hardness than the hardened steel journal surface of known camshaft arrangements, rotation ol the camshaft results in less wear to both the journal surface and the bearing surface.
In another embodiment, a ceramic coating is applied to the bearing surface instead of the journal surface. Alternatively a ceramic coating is applied to both the bearing surface and the journal surface.
Figure 8 shows an alternative drum brake camshaft arrangement 118, in which features identical or similar to the embodiment of figures 1 to 7 are numbered 100 greater.
The camshaft 1 18 is identical to camshaft 18 of the embodiment of figures I to 7. However in the embodiment of figure 8, a ceramic coating 190 is also applied to the bearing surface 168. 'I'he coating 190 is applied to the inside bearing surface 168 over a longitudinal distance X2. 'I'he longitudinal distance X2 corresponds to the length of the bearing surface which is in contact with the camshaft journal surface coating 188. The thickness of the bearing coating is approximately 0.3 mm. Figure 9 shows more clearly the surfaces described in relation to figure 8.
Coating both the camshaft journal and the bearing results in a further reduction in wear in comparison to the embodiment of figures I to 7 where only the camshaft journal surface is coated. In contrast to the embodiment of figures I to 7, the camshaft arrangement of figure 8 has no lubrication point, since the operating conditions of this embodiment are such that no lubrication is required. Hence no grease nipple, cross holes, and groove is required, and therefore the number of components is reduced as well as a reduction in assembly and machining time. Consequently there is no requirement for grease seals on the camshaft.
However dust seals remain to prevent dust from contaminating the region between the journal surface and the bearing surface, as does the boot to cover the dust seals.
Whilst the camshaft arrangement of figure 8 does not require lubrication, it should be noted that camshaft arrangements without lubrication are not limited to those with coatings on both the camshaft journal and bearing surfaces. Hence, in other embodiments, a camshaft arrangement with a coating on just the journal surface or the bearing surface can be provided without the need for lubrication.
With reference to figure 10 there is shown an alternative camshaft arrangement 218, in which features identical or similar to the embodiment of figure 8 are numbered 100 greater.
The camshaft 220 is identical to camshaft 118 of the embodiment of figure 8. However in the embodiment of figure 10, the bearing and the bearing housing are provided as an integral one piece component 225 as opposed to the assembly of the housing and bearing of the embodiment of figure 8. Since no lubrication is required between the bearing surface and the camshaft journal, there is no requirement for cross holes and grooves to be machined in the bearing. Thus a two piece bearing which enables such machining is no longer required, and hence a one-piece integrated bearing arrangement is more desirable.
By providing an integrated bearing, the number of components and assembly time is reduced in comparison to a camshaft arrangement with a two-piece non-lubricated bearing.
In the embodiments of figures 1 to 10, the ceramic coating is applied by plasma spraying.
However, other suitable techniques to apply the coating may also be used, such as alternative spraying techniques, vapour deposition, or dipping.
In the embodiments of figures 1 to 10, an alumina coating is used. Alternatively, other known ceramic coatings, particularly metallic based ceramic coatings can be applied to either or both surfaces.
Whilst the camshaft arrangement of the present invention can be supplied as an assembly, i.e. including both the camshaft and the bearing, it is sometimes necessary to replace either the camshaft or the bearing of a part worn camshaft arrangement. For example, a known steel camshaft with a steel journal surface can be replaced by a camshaft with a ceramic coated journal according to the present invention. Alternatively, a known steel bearing can be replaced by a ceramic coated bearing of the present invention. Hence the ceramic coated journal or the bearing of the present invention can be used for replacing parts of known camshaft arrangements.
As an alternative to replacing a worn bearing/camshafts, it is possible to repair them by coating the journal and/or bearing surface. The worn bearing/camshaft could be a worn known steel component, or a worn ceramic coated component of the present invention.
One factor influencing whether repair or replacement is appropriate is the condition of the non bearing/journal surface part of the component.
Claims (15)
1. A drum brake camshaft arrangement including a drum brake camshaft having a journal surface, and a bearing having a bearing surface in contact with the journal surface, in which one or both of the journal surface and the bearing surface has a ceramic coating.
2. A drum brake camshaft arrangement according to claim I in which there is no lubrication between the camshaft journal surface and the bearing surface.
3. A drum brake camshaft arrangement according to claim I or 2 in which both the journal surface and the bearing surface have a ceramic coating.
4. A drum brake camshaft bearing having a bearing surface for contact with an associated camshaft journal in which the bearing surface has a ceramic coating.
5. A drum brake camshaft bearing arrangement including a housing and a bearing according to claim 4.
6. A drum brake camshaft bearing arrangement according to claim 5 in which the housing is integral with the bearing.
7. A drum brake camshaft arrangement according to claim 1 or 2 or 3 or a drum brake camshaft bearing according to claim 4 or a drum brake camshaft bearing arrangement according to claim 5 or 6 in which the bearing or the housing has no lubrication supply means such as a lubrication nipple, capped lubrication cup, oiler or the like for supplying lubrication for the bearing surface.
8. A drum brake camshaft arrangement or a drum brake camshaft bearing or a drum brake camshaft bearing arrangement according to claim 7 in which the bearing has no lubrication distribution means such as grooves and/or holes or the like for distributing lubrication to the bearing surface.
9. A drum brake camshaft having a journal surface in which the journal surface has a ceramic coating.
10. A drum brake camshaft arrangement according to any one of claims 1 to 3 or 7 or 8 or a drum brake camshaft bearing according to claim 4 or 7 or 8 or a drum brake camshaft bearing arrangement according to claim 5 or 6 or 7 or 8 or a drum brake camshaft according to claim 9, in which the ceramic coating is deposited by plasma spraying.
11. A drum brake camshaft arrangement according to any one of claims 1 to 3 or 7 or 8 or 10 or a drum brake camshaft bearing according to claim 4 or 7 or 8 or 10 or a drum brake camshaft bearing arrangement according to claim S or 6 or 7 or 8 or 10 or a drum brake camshaft according to claim 9 or 10, in which the ceramic coating is a metallic based ceramic coating.
12. A method of repairing a drum brake camshaft, including the steps of: providing a drum brake camshaft with a worn journal surface, and then applying a ceramic coating to the worn journal surface.
13. A method of repairing a drum brake camshaft bearing, including the steps of providing a drum brake camshaft bearing with a worn bearing surface, and then applying a ceramic coating to the worn bearing surface.
14. A method of repairing a drum brake camshaft according to claim 12, or a method of repairing a drum brake camshaft bearing according to claim 13 in which the worn journal surface and/or the worn bearing surface is a steel surface.
15. A method of repairing a drum brake camshaft according to claim 12, or a method of repairing a drum brake camshaft bearing according to claim 13 in which the worn journal surface and/or the worn bearing surface is a ceramic coated surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0227452A GB2395760B (en) | 2002-11-26 | 2002-11-26 | Drum brake camshaft arrangement |
| DE20318189U DE20318189U1 (en) | 2002-11-26 | 2003-11-25 | Camshaft arrangement for a drum brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0227452A GB2395760B (en) | 2002-11-26 | 2002-11-26 | Drum brake camshaft arrangement |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0227452D0 GB0227452D0 (en) | 2002-12-31 |
| GB2395760A true GB2395760A (en) | 2004-06-02 |
| GB2395760B GB2395760B (en) | 2006-03-15 |
Family
ID=9948462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0227452A Expired - Fee Related GB2395760B (en) | 2002-11-26 | 2002-11-26 | Drum brake camshaft arrangement |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE20318189U1 (en) |
| GB (1) | GB2395760B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285042A (en) * | 2019-07-09 | 2019-09-27 | 象山天星汽配有限责任公司 | A kind of integrated-type intelligent water pump the cover |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163820A (en) * | 1982-03-19 | 1983-09-28 | Daido Steel Co Ltd | Slide member |
| US5477945A (en) * | 1994-04-14 | 1995-12-26 | Bpw Bergische Achsen Kommanditgesellschaft | Drum brake arrangement for vehicle axles |
| GB2362691A (en) * | 2000-05-26 | 2001-11-28 | Meritor Heavy Vehicle Sys Ltd | Vehicle brake cam roller having a ceramic sleeve |
-
2002
- 2002-11-26 GB GB0227452A patent/GB2395760B/en not_active Expired - Fee Related
-
2003
- 2003-11-25 DE DE20318189U patent/DE20318189U1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163820A (en) * | 1982-03-19 | 1983-09-28 | Daido Steel Co Ltd | Slide member |
| US5477945A (en) * | 1994-04-14 | 1995-12-26 | Bpw Bergische Achsen Kommanditgesellschaft | Drum brake arrangement for vehicle axles |
| GB2362691A (en) * | 2000-05-26 | 2001-11-28 | Meritor Heavy Vehicle Sys Ltd | Vehicle brake cam roller having a ceramic sleeve |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0227452D0 (en) | 2002-12-31 |
| GB2395760B (en) | 2006-03-15 |
| DE20318189U1 (en) | 2004-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20111126 |