GB2041153A - Coated pistons - Google Patents
Coated pistons Download PDFInfo
- Publication number
- GB2041153A GB2041153A GB8002545A GB8002545A GB2041153A GB 2041153 A GB2041153 A GB 2041153A GB 8002545 A GB8002545 A GB 8002545A GB 8002545 A GB8002545 A GB 8002545A GB 2041153 A GB2041153 A GB 2041153A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- layer
- plastics
- guide surfaces
- thickness
- 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
- 239000004033 plastic Substances 0.000 claims abstract description 32
- 229920003023 plastic Polymers 0.000 claims abstract description 32
- 239000004952 Polyamide Substances 0.000 claims abstract description 15
- 229920002647 polyamide Polymers 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000001464 adherent effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 7
- FRPZMMHWLSIFAZ-UHFFFAOYSA-N 10-undecenoic acid Chemical compound OC(=O)CCCCCCCCC=C FRPZMMHWLSIFAZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- KHAVLLBUVKBTBG-UHFFFAOYSA-N caproleic acid Natural products OC(=O)CCCCCCCC=C KHAVLLBUVKBTBG-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004359 castor oil Substances 0.000 claims abstract description 4
- 235000019438 castor oil Nutrition 0.000 claims abstract description 4
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims abstract description 4
- 229960002703 undecylenic acid Drugs 0.000 claims abstract description 4
- 239000003981 vehicle Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000004959 Rilsan Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- HASUJDLTAYUWCO-UHFFFAOYSA-N 2-aminoundecanoic acid Chemical compound CCCCCCCCCC(N)C(O)=O HASUJDLTAYUWCO-UHFFFAOYSA-N 0.000 claims description 3
- 241001052209 Cylinder Species 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 239000002253 acid Substances 0.000 abstract 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/02—Bearing surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
- B62D5/12—Piston and cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/04—PTFE [PolyTetraFluorEthylene]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Laminated Bodies (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Actuator (AREA)
Abstract
A piston (10) has a guide surface constituted by a wear-resistant plastics layer adherent to the piston. The layer may be a layer of polyamide or of polytetrafluoroethylene. Preferably, it is a layer of polycondensate of 1,12-amino-undecanic acid produced as a polyamide material from castor oil by way of undecylenic acid. Suitably the layer has a final thickness of the order of approximately 0.2 to 0.3mm. If it is applied by the whirl- sintering process, an initial layer thickness of approximately 0.4 to 0.5mm may be machined down to the final thickness. <IMAGE>
Description
SPECIFICATION
Improvements relating to working pistons
The invention relates to a working piston of the kind having interior and/or exterior guide surfaces for guidance within a working cylin
der and/or by moving parts thereon;
particularly but not exclusively pistons for hydraulic servo-steering systems of motor vehicles.
In pistons of this kind in use, the guide surfaces are of the same material as the piston
itself. This is disadvantageous with respect to
mechanical efficiency and, particularly in the case of pistons in servo-steering systems, with
respect to the piston-return behaviour. It is also disadvantageous that, in the event of
production errors, excessive tolerances, wear or other damage to the guide surfaces, the
piston as a whole often becomes unserviceable.
The present invention seeks to provide a piston of the aforesaid kind which, when used as intended, permits of improved mechanical efficiency in the region of its stressed guide surfaces and, particularly when used as a piston of a vehicle servo-steering system, affords better return behaviour, and which permits of relatively inexpensive and simple renewal of its guide surfaces even in the event of production errors, excessive tolerances, wear or other damage to the said surfaces.
According to the invention, in a working piston with one or more interior and/or exterior guide surfaces for guidance within a cylinder and/or by a moving part thereon or therein, the or each guide surface is constituted by a wear-resistant plastics layer firmly adherent to the piston. By this means, substantially better mechanical efficiency and, particularly when the'piston is used in a vehicle servo-steering system, improved return behaviour can be achieved. Also it is made possible for the guide surfaces to be renewed relatively inexpensively and simply, in the event of production errors, excessive tolerances, wear or other damage, by applying a fresh plastics layer, so that the piston as a whole does not become serviceable.
Advantageously, the plastics material is a polyamide material, particularly a polycondensate of 1,1 2-amino-undecanic acid produced as a polyamide material from castor oil by way of undecylenic acid, suitably that available under the brand name "Rilsan". Alternatively the plastics layer may be of polytetrafluoroethylene. Such plastics layers can be applied in firmly adherent manner in a required adequate thickness.
Advantageously, the plastics layer has a final thickness of the order of approximately 0.2 to 0.3mm. Preferably the layer is applied by the whirl sintering process with an initial layer thickness of approximately 0.4 to 0.5mm and is machined down to a final layer thickness by fine turning or other chip-taking
operation. No problems arise with regard to
either the application of the plastics layer or the machining to the required final layer thick
ness.
One embodiment of the invention by way of example will now be described with reference to the accompanying drawing, which is a diagrammatic axial longitudinal section through a working piston for a hydraulic servo-steering system of a motor vehicle.
The piston comprises a metallic, fully machined, basic body 10 with exterior guide surfaces 11 and 1 2 on the left-hand end region 1 3 and the elongate right-hand end region 14 respectively.
The piston need not be described in detail, as the configuration of the body 10 is of a known kind.
The guide surfaces 11 and 1 2 are constituted by wear-resistant plastics layers, 1 5 and 1 6 respectively, applied in firmly adherent manner to the metal body 1 0. The two layers
15, 1 6 may, for example, be composed of polytetrafluoroethylene (PTFE) or, preferably, of a polyamide. As a polyamide material, that available under the brand name "Rilsan" is particularly suitable. The plastics layers 15, 1 6 have a final thickness of the order of approximately 0.2 to 0.3mm.If the layers are produced by the whirl-sintering process, they may be applied with an initial thickness of approximately 0.4 to 0.5mm. Polyamide material of this thickness can be applied to the metal body 10 without difficulty by the whirl-sintering process. The plastics layers thus applied are then machined down to the final thickness of approximately 0.2 to 0.3mm by a chip-taking operation, particulary by fine turning.
In the example illustrated, plastics layers are applied to two exterior guide surfaces. However, such layers may be applied to more than two guide surfaces or to one such piston surface, which may, be interior and/or exterior surfaces. Furthermore, instead of being intended to be guided within a cylinder, the guide surfaces may be designed for guidance by a part movable on or in the cylinder.
1. A working piston with one or more interior and/or exterior guide surfaces for guidance within a cylinder and/or by a moving part therein or thereon, wherein the or each guide surface is constituted by a wearresistant plastics layer firmly adherent to the piston.
2. A piston according to claim 1, wherein the plastics layer is a layer of polyamide.
3. A piston according to claim 1, wherein the plastics layer is a layer of polytetrafluoroethylene.
4. A piston according to claim 2, wherein
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A working piston with one or more interior and/or exterior guide surfaces for guidance within a cylinder and/or by a moving part therein or thereon, wherein the or each guide surface is constituted by a wearresistant plastics layer firmly adherent to the piston.
2. A piston according to claim 1, wherein the plastics layer is a layer of polyamide.
3. A piston according to claim 1, wherein the plastics layer is a layer of polytetrafluoroethylene.
4. A piston according to claim 2, wherein the plastics layer is a layer of polycondensate of 1,1 2-amino-undecanic acid produced as a polyamide material from castor oil by way of undecylenic acid.
5. A piston according to any one of claims 1 to 4, wherein the plastics layer has a final thickness of the order of approximately 0.2 to 0.3mm.
6. A piston according to any one of claims 1 to 5, wherein the plastics layer is a layer applied by the whirl-sintering process with an initial layer thickness of approximately 0.4 to 0.5mm and is machined down to a final layer thickness by fine turning or other chip-taking operation.
7. A working piston substantially as hereinbefore described with reference to the accompanying drawing.
8. A method of producing a working piston substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792903616 DE2903616A1 (en) | 1979-01-31 | 1979-01-31 | WORKING PISTON WITH INTERNAL AND / OR EXTERNAL GUIDE SURFACES, ESPECIALLY FOR HYDRAULIC AUXILIARY POWER STEERING OF MOTOR VEHICLES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2041153A true GB2041153A (en) | 1980-09-03 |
| GB2041153B GB2041153B (en) | 1983-03-23 |
Family
ID=6061800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8002545A Expired GB2041153B (en) | 1979-01-31 | 1980-01-25 | Coated pistons |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2903616A1 (en) |
| FR (1) | FR2448083A1 (en) |
| GB (1) | GB2041153B (en) |
| IT (1) | IT1146103B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0085687A1 (en) * | 1981-08-13 | 1983-08-17 | Commw Scient Ind Res Org | Reciprocatory piston and cylinder machine. |
| US5333536A (en) * | 1990-08-16 | 1994-08-02 | Yuda Lawrence F | Piston and method of manufacture |
| ES2241461A1 (en) * | 2003-10-09 | 2005-10-16 | Miba Sinter Spain, S.A. | Piston rod for hydraulic shock absorber |
| US20120042776A1 (en) * | 2010-08-19 | 2012-02-23 | Robert Bosch Gmbh | Piston Guide Element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB754870A (en) * | 1953-05-11 | 1956-08-15 | Gen Motors Corp | Improvements in pistons and piston rings for internal combustion engines |
| GB1146835A (en) * | 1965-07-14 | 1969-03-26 | Wellworthy Ltd | Improvements in or relating to pistons |
-
1979
- 1979-01-31 DE DE19792903616 patent/DE2903616A1/en not_active Withdrawn
-
1980
- 1980-01-25 GB GB8002545A patent/GB2041153B/en not_active Expired
- 1980-01-29 FR FR8001868A patent/FR2448083A1/en active Granted
- 1980-01-29 IT IT47744/80A patent/IT1146103B/en active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0085687A1 (en) * | 1981-08-13 | 1983-08-17 | Commw Scient Ind Res Org | Reciprocatory piston and cylinder machine. |
| EP0085687A4 (en) * | 1981-08-13 | 1984-03-29 | Commw Scient Ind Res Org | Reciprocatory piston and cylinder machine. |
| US5333536A (en) * | 1990-08-16 | 1994-08-02 | Yuda Lawrence F | Piston and method of manufacture |
| ES2241461A1 (en) * | 2003-10-09 | 2005-10-16 | Miba Sinter Spain, S.A. | Piston rod for hydraulic shock absorber |
| US20120042776A1 (en) * | 2010-08-19 | 2012-02-23 | Robert Bosch Gmbh | Piston Guide Element |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2903616A1 (en) | 1980-08-14 |
| IT1146103B (en) | 1986-11-12 |
| GB2041153B (en) | 1983-03-23 |
| FR2448083A1 (en) | 1980-08-29 |
| IT8047744A0 (en) | 1980-01-29 |
| FR2448083B1 (en) | 1984-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |