GB1598311A - Hydraulic pump or motor - Google Patents
Hydraulic pump or motor Download PDFInfo
- Publication number
- GB1598311A GB1598311A GB3503977A GB3503977A GB1598311A GB 1598311 A GB1598311 A GB 1598311A GB 3503977 A GB3503977 A GB 3503977A GB 3503977 A GB3503977 A GB 3503977A GB 1598311 A GB1598311 A GB 1598311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- slippers
- bearing
- pistons
- cylinder block
- 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
Links
- 239000000463 material Substances 0.000 claims description 19
- 230000035699 permeability Effects 0.000 claims description 15
- 229910000906 Bronze Inorganic materials 0.000 claims description 10
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 8
- 239000010974 bronze Substances 0.000 claims description 8
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 claims description 2
- 210000003734 kidney Anatomy 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
-
- 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
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0466—Nickel
-
- 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
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0469—Other heavy metals
- F05C2201/0475—Copper or alloys thereof
-
- 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
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0469—Other heavy metals
- F05C2201/0475—Copper or alloys thereof
- F05C2201/0478—Bronze (Cu/Sn alloy)
-
- 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
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
(54) HYDRAULIC PUMP OR MOTOR
(71) We, LUCAS INDUSTRIES LI
MITED, a British company of Great King
Street, Birmingham B19 2XF do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement:
This invention relates to a hydraulic pump or motor, hereinafter to be referred to simply as a hydraulic machine.
There is a demand for equipment having low magnetic permeability, for use, for example, in mine sweeping applications.
However. the normal requirement is for hydraulic machines to be used in such equipment to have a magnetic permeability ot less than 1.05 It. It is now desired to produce a hydraulic machine having a very much lower magnetic permeability, i.e. less than 1.005 It The Applicants expected to be able to use stainless steel in the construction of a hydraulic machine having a magnetic permeability of 1.005 It since certain stainless steel alloys have this low magnetic permeability. However, in practice they were surprised to find that the properties of the stainless steel alloy are rather unstable after machining and annealing with the result that the permeability tends to rise to unacceptable levels.
An object of the present invention is to provide a hydraulic machine which can be manufactured in quantity consistently to have the desired very low magnetic permeability.
According to the present invention, there is provided a hydraulic machine (as defined herein) wherein the parts of the machine are formed from material having a sufficiently low magnetic permeability that the overall magnetic permeability of the machine is less than 1.005 u, characterised in that the materials are substantially non-ferrous materials and bearing surfaces are coated with a relatively hard bearing material such as chromium.
The hydraulic machine may be a swash plate pump or motor comprising a cylinder block, pistons slidable in the cylinder block, a cam surface and slippers engaged with the pistons and abutting against a cam plate, the surface of the cam plate against which the slippers engage and the cylinder wall engaging surfaces of the pistons being coated with said hard bearing material.
Preferably, the cylinder block is of bronze and a housing of the machine is formed of aluminium alloy.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawing which is an axial section through a hydraulic motor according to one embodiment of the present invention.
Referring to the drawing, the motor comprises aluminium alloy housing parts 1, 2 and 3 secured together by cupro nickel studs and bolts 4 a suitable material for the bolts and studs 4 is Hidrax Special Wrought (Alloy Code 13A) having a composition of 2.04-4.0% aluminium, 0.5-2.5% iron, 13.016.0% nickel, 0.1-0.5% manganese and the balance being copper. Within the housing, there is provided a cylinder block 5 formed of a high strength bronze (e.g. Hidurel 5
Alloy Code Cast 3F containing 1.8-2% nickel, 0.3-0.5% silicon and the remainder being copper). The cylinder block 5 is keyed to a shaft 6 formed of high strength cupro nickel (e.g. Hidurax Special Wrought Alloy
Code 13A) provided with chromed bearing areas adjacent aluminium bronze bearing bushes 7. The cylinder block 5 is provided with a separate ported bearing plate 8 which bears against a stationary port plate 9.The plates 8 and 9 are formed of the same material as the remainder of the cylinder block 5 but the bearing surface, i.e. the surface engaged by the bearing plate 9, of the port plate 6 is chromed. Cylinder bores 10 are aligned with the ports in the ported bearing plate 8 and a seal 11 prevents escape of fluid from each cylinder wall 10 between the plate 8 and the remainder of the cylinder block 5. Each seal 11 comprises an annular sealing member 12 which is urged into engagement with the bearing plate 8 by means of a spring 13 acting between a fixed and a slidable cup member 14 and 15 respectively. The members 12, 14 and 15 are formed of high strength cupro nickel (in this embodiment the Hidurax Special cupro nickel alloy mentioned hereinabove) whilst the spring 13 is formed of a beryllium copper alloy.Slidable in the cylinder bores 10 are respective pistons 16 formed of high strength cupro nickel (in this embodiment
Hidurax Special as mentioned above) with chromed bearing areas. The pistons 16 engage in respective slippers 17 formed of aluminium bronze. The slippers 17 engage against a fixed cam plate 18 formed of high strength bronze (in this embodiment
Hidurel 5 as mentioned above) provided with a chromed bearing surface against which the slippers 17 engage. The slippers 17 are located in an auxiliary cam plate 19 formed of aluminium alloy having a hard anodised surface. A retainer plate 20 for retaining the auxiliary cam plate 19 in position is formed of aluminium bronze alloy. An end cap 21 through which the shaft 6 passes to extend externally of the housing is formed of high strength bronze (in this embodiment the Hidurel 5 alloy mentioned hereinbefore).All of the fixing studs, bolts, dowels, etc, are formed of the same material as the studs and bolts 4.
The above-described motor has a magnetic permeability of 1.004 Ft.
In use, the motor operates in a manner well known in the art for swash plate type motors. Hydraulic fluid under pressure is supplied to one of two kidney shaped ports in the port plate 9 whilst the other port in the plate 9 is connected to a low pressure side of the supply circuit. The reaction of the piston under pressure against the inclined cam surface 18 through the intermediary of the slippers 17 causes rotation of the cylinder block and thus rotation of the shaft 6 so that the pistons 16 are successively connected with the high pressure port and the low pressure port. The precise manner in which this occurs is well known in the art and will not be described herein in any further detail since it forms no part of the present invention.
WHAT WE CLAIM IS:
1. A hydraulic machine (as defined herein) wherein the parts of the machine are formed from material having sufficiently low magnetic permeability that the overall magnetic permeability of the machine is less than 1.005cm, characterised in that the materials are substantially non-ferrous materials and bearing surfaces are coated with a relatively hard bearing material such as chromium.
2. A hydraulic machine as claimed in claim 1, in the form of a swash plate pump or motor comprising a cylinder block, pistons slidable in the cylinder block, a cam surface and slippers engaged with the pistons and abutting against a cam plate, the surface of the cam plate against which the slippers engage and the cylinder wall engaging surfaces of the pistons being coated with said hard bearing material.
3. A hydraulic machine as claimed in claim 2, wherein the cylinder block is of bronze and a housing of the pump or motor is formed of aluminium alloy.
5. A hydraulic machine substantially as hereinbefore described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (1)
- **WARNING** start of CLMS field may overlap end of DESC **.surface engaged by the bearing plate 9, of the port plate 6 is chromed. Cylinder bores 10 are aligned with the ports in the ported bearing plate 8 and a seal 11 prevents escape of fluid from each cylinder wall 10 between the plate 8 and the remainder of the cylinder block 5. Each seal 11 comprises an annular sealing member 12 which is urged into engagement with the bearing plate 8 by means of a spring 13 acting between a fixed and a slidable cup member 14 and 15 respectively. The members 12, 14 and 15 are formed of high strength cupro nickel (in this embodiment the Hidurax Special cupro nickel alloy mentioned hereinabove) whilst the spring 13 is formed of a beryllium copper alloy.Slidable in the cylinder bores 10 are respective pistons 16 formed of high strength cupro nickel (in this embodiment Hidurax Special as mentioned above) with chromed bearing areas. The pistons 16 engage in respective slippers 17 formed of aluminium bronze. The slippers 17 engage against a fixed cam plate 18 formed of high strength bronze (in this embodiment Hidurel 5 as mentioned above) provided with a chromed bearing surface against which the slippers 17 engage. The slippers 17 are located in an auxiliary cam plate 19 formed of aluminium alloy having a hard anodised surface. A retainer plate 20 for retaining the auxiliary cam plate 19 in position is formed of aluminium bronze alloy. An end cap 21 through which the shaft 6 passes to extend externally of the housing is formed of high strength bronze (in this embodiment the Hidurel 5 alloy mentioned hereinbefore).All of the fixing studs, bolts, dowels, etc, are formed of the same material as the studs and bolts 4.The above-described motor has a magnetic permeability of 1.004 Ft.In use, the motor operates in a manner well known in the art for swash plate type motors. Hydraulic fluid under pressure is supplied to one of two kidney shaped ports in the port plate 9 whilst the other port in the plate 9 is connected to a low pressure side of the supply circuit. The reaction of the piston under pressure against the inclined cam surface 18 through the intermediary of the slippers 17 causes rotation of the cylinder block and thus rotation of the shaft 6 so that the pistons 16 are successively connected with the high pressure port and the low pressure port. The precise manner in which this occurs is well known in the art and will not be described herein in any further detail since it forms no part of the present invention.WHAT WE CLAIM IS:1. A hydraulic machine (as defined herein) wherein the parts of the machine are formed from material having sufficiently low magnetic permeability that the overall magnetic permeability of the machine is less than 1.005cm, characterised in that the materials are substantially non-ferrous materials and bearing surfaces are coated with a relatively hard bearing material such as chromium.2. A hydraulic machine as claimed in claim 1, in the form of a swash plate pump or motor comprising a cylinder block, pistons slidable in the cylinder block, a cam surface and slippers engaged with the pistons and abutting against a cam plate, the surface of the cam plate against which the slippers engage and the cylinder wall engaging surfaces of the pistons being coated with said hard bearing material.3. A hydraulic machine as claimed in claim 2, wherein the cylinder block is of bronze and a housing of the pump or motor is formed of aluminium alloy.5. A hydraulic machine substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3503977A GB1598311A (en) | 1977-08-20 | 1977-08-20 | Hydraulic pump or motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3503977A GB1598311A (en) | 1977-08-20 | 1977-08-20 | Hydraulic pump or motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1598311A true GB1598311A (en) | 1981-09-16 |
Family
ID=10373075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3503977A Expired GB1598311A (en) | 1977-08-20 | 1977-08-20 | Hydraulic pump or motor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1598311A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444093A (en) * | 1980-10-22 | 1984-04-24 | Honda Giken Kogyo Kabushiki Kaisha | Slant plate type hydraulic device |
| US4478557A (en) * | 1982-03-05 | 1984-10-23 | Messier-Hispano-Bugatti(S.A.) | Hydraulic power transducer |
-
1977
- 1977-08-20 GB GB3503977A patent/GB1598311A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4444093A (en) * | 1980-10-22 | 1984-04-24 | Honda Giken Kogyo Kabushiki Kaisha | Slant plate type hydraulic device |
| US4478557A (en) * | 1982-03-05 | 1984-10-23 | Messier-Hispano-Bugatti(S.A.) | Hydraulic power transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |