GB1581320A - Cylinder containing body for a multi-piston hydraulic pumpor motor - Google Patents
Cylinder containing body for a multi-piston hydraulic pumpor motor Download PDFInfo
- Publication number
- GB1581320A GB1581320A GB11997/78A GB1199778A GB1581320A GB 1581320 A GB1581320 A GB 1581320A GB 11997/78 A GB11997/78 A GB 11997/78A GB 1199778 A GB1199778 A GB 1199778A GB 1581320 A GB1581320 A GB 1581320A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tubes
- tube
- external
- cylinder
- internal
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 39
- 239000010959 steel Substances 0.000 claims description 39
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 238000003754 machining Methods 0.000 claims description 10
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 9
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 238000005476 soldering Methods 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000005219 brazing Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011343 solid material Substances 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
- F04B1/20—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 having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2035—Cylinder barrels
-
- 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
- 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)
- Details Of Reciprocating Pumps (AREA)
Description
(54) CYLINDER CONTAINING BODY FOR A MULTI-PISTON
HYDRAULIC PUMP OR MOTOR
(71) We, SOCIETE INDUSTRIELLE
DES COUSSINETS, a body corporate organist and existing under the laws of
France, of 12 rue du General Foy, 75008
Paris, France, 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:
The invention concerns a cylinder containing body for a multi-piston hydraulic pump or motor and a method of making said body.
The cylinder containing body of a multipiston hydraulic pump or motor normally comprises a metallic cylindrical member mounted for rotation about a shaft, and which has a smooth anti-friction surface bearing against a stationary distribution member, a plurality of identical axial cylinders are bored in the member and open out at the distributor side. The bores of the cylinders must have anti-friction properties to allow for reciprocating sliding motion of the pistons.
Various solutions have been proposed for the construction of the cylinder containing body. It may be made entirely of a solid material with certain anti-friction proP- erties, e.g. copper alloy (bronze or brass.
These materials cannot simultaneously have good mechanical strength properties and good anti-friction properties, since the properties are mutually exclusive. Solutions of this type thus limit the performance of the pump or motor or necessitates taking precautions in its design which increase the price. In addition, the difference between the coefficient of expansion of the copper alloy body and that of the steel pistons leads to changes in clearance tolerances and thus a reduction in performance.
Steel bodies have also been made, in which the cylinders are each coated with an anti-friction alloy by casting or by fitting a sleeve which is fixed to the inside of the cylinder by various means; adhesion, hooping, metallurgical bonding by diffusing a constituent of the alloy, etc. These methods give good results but are found to be expensive and difficult to carry out.
According to the present invention in one aspect there is provided a cylinder containing body for a multi-piston hydraulic pump or motor, comprising an external cylindrical steel tube, an internal concentric cylindrical steel tube, said tubes defining between them an annular space, a plurality of cylindrical steel tubes corresponding to the number of cylinders, said plurality of steel tubes being parallel and located in said annular space in contact with each other and in contact with the external and internal steel tubes, and the remainder of said body consisting of an anti-friction metal alloy, being bored in the anti-friction alloy within the plurality of steel tubes.
According to the present invention in another aspect there is provided a method of manufacturing such a body, comprising the steps of making a mould consisting of a base, an external cylindrical steel tube, an internal concentric cylindrical steel tube, said tubes defining between them an annular space, a plurality of cylindrical steel tubes corresponding to the number of cylinders required in said body, said plurality of steel tubes being parallel and located in said annular space in contact with each other and in contact with the external and internal steel tubes, said plurality of tubes each having an internal diameter larger than the diameter of the cylinder bores to be formed, connecting the tubes together over at least part of their contacting surfaces, casting an anti-friction metal alloy into the free spaces of the annular space, removing the base, and machining the cylinder bores in the cast metal within the plurality of steel tubes.
An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawings, in which:
Figure 1 is an elevational view in axial half-section through the part of the cylinder containing body forming a steel mould before an anti-friction alloy is cast therein,
Figure 2 is a section through the mould taken along the line A-A of Figure 1, and
Figure 3 is an elevational view in axial half-section through the finished cylinder containing body for a pump or motor.
The cylinder containing body for a hydraulic axial piston pump tor motor) according to the invention is in the form of a cylindrical member bounded by an external steel tube 1 and an internal coaxial steel tube 2 with the axis of the body being coincident with the axis of rotation of the pump rotor. In the annular gap between the tubes 1 and 2 there are placed a plurality of cylindrical tubes 3 with their axes parallel to the axis of rotation of the pump rotor and each having an internal diameter sightly larger than the diameter of the bore of the cylinders 4 of the pump or motor. The tubes 3 are at a tangent to one another in pairs and at a tangent to the tubes 1 and 2 along a common generating line.The freespace formed between the tubes 1 and 2 is filled with an anti-friction metal alloy, e.g. a copper alloy such as bronze or brass, and forms the wall 5 of the cylinders 4 inside the tubes 3.
The method of manufacturing such a cylinder containing body for a pump or motor comprises making the mould shown in Figures 1 and 2. The external tube 1, the tubes 3 and the internal tube 2 are placed in
a vertical position, the external tube 1 being of greater length than the others. The tubes 2 and 3 are inserted with the aid of press tools so as to absorb the dimensional differences due to manufacturing tolerances. The assembly of tubes is rigidly connected together by some soldering or brazing points on certain common generating lines. For example, each cylinder tube 3 may be fixed on the external tube 1 by two soldering points, then the internal tube 2 fixed on two substantially opposed cylinder tubes 3. This provides a set of tubes of sufficient rigidity.
The external tube 1 is closed at the bottom end by a flat base plate 6. The anti-friction alloy is then cast into a free space between the internal tube 2 and the external tube 1, possibly while pre-heating the mould. Thus the tubes 3 are immersed in the anti-friction alloy, which also fills all the lower part of the mould 7 below the tube 2 and the tubes 3 and the upper part 8 of the mould above the tubes 2 and 3. The base plate 6 is then removed and the component obtained is machined to its final dimensions. The cylinders 4 are bored and carefully machined to the envisaged internal diameter; the hole 9 connecting each cylinder 4 to the surface 10 is also machined. The surface 10, which happens to consist of anti-friction alloy, has to be machined precisely so that it can act as a contact surface with the distribution member (not shown) of the pump or motor.The opposite end surface 11 is also prepared in appropriate manner.
The chips of anti-friction alloy obtained during machining are of course carefully recovered for re-use in subsequent casting, thus limiting the losses of raw materials.
Example
A cylinder containing body for a 9cylinder hydraulic pump was made, with a final cylinder bore size of 20 mm. The internal diameter of the cylinder tubes was chosen so that the anti-friction copper alloy left after machining was 0.75 mm thick, giving an internal diameter of 21.5 mm. The external diameter of the cylinder tubes was determined from the diameter D of the circumference passing through the centres of the cylinders.
If D = 82 mm, the external diameter of the cylinder tubes equals D sine 20 , i.e.
28.4 mm.
The internal diameter of the external tube is then equal to 82. + 28.04 = 110.04 mm and the external diameter of the internal tube is equal to 82 - 28.04 = 53.96 mm.
Allowing for machining carried out after casting, 119 mm is chosen as the external diameter of the external tube and 41 mm as the internal diameter of the internal tube.
The mould is closed with a disc 115 mm in diameter and 2 mm thick, which is soldered.
Two components at a time are cast in the mould.
The length of the various tubes is determined as follows; allowing for total machining with cuttings of 6 mm (usinage total de recoupe de 6 mm), to give a component with a total length of 88 mm and with an extra thickness of 2 mm of copper alloy at the distributor side, as shown in Figure 3.
Length of cylinder tubes and internal tube:
2 x 86 + 6 = 178 mm
Length of external tube:
2 x 88 + 6 + 7 + 25 = 214 mm
WHAT WE CLAIM IS:
1. A cylinder containing body for a multi-piston hydraulic pump or motor, comprising an external cylindrical steel tube, an internal concentric cylindrical steel tube, said tubes defining between them an annular space, a plurality of cylindrical steel tubes corresponding to the number of cylinders, said plurality of steel tubes being parallel and located in said annular space in contact with each other and in contact with the external and internal steel tubes, and the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A cylinder containing body for a multi-piston hydraulic pump or motor, comprising an external cylindrical steel tube, an internal concentric cylindrical steel tube, said tubes defining between them an annular space, a plurality of cylindrical steel tubes corresponding to the number of cylinders, said plurality of steel tubes being parallel and located in said annular space in contact with each other and in contact with the external and internal steel tubes, and the
remainder of said body consisting of an anti-friction metal alloy, the cylinders being bored in the anti-friction alloy within the plurality of steel tubes.
2. A cylinder containing body as claimed in claim 1, in which the metal alloy comprises a copper alloy.
3. A cylinder containing body as claimed in claim 1 or claim 2, in which the metal alloy forms the end surfaces of the body.
4. A cylinder containing body for a multi-piston hydraulic pump or motor, substantially as hereinbefore described with reference to the accompanying drawings.
5. A multi-piston hydraulic pump or motor provided with a cylinder containing body as claimed in any preceding claim.
6. A method of manufacturing a cylinder containing body as claimed in any one of claims 1 to 4, comprising the steps of making a mould consisting of a base, an external cylindrical steel tube, an internal concentric cylindrical steel tube, said tubes defining between them an annular space, a plurality of cylindrical steel tubes corresponding to the number of cylinders required in said body, said plurality of steel tubes being parallel and located in said annular space in contact with each other and in contact with the external and internal steel tubes, said plurality of tubes each having an internal diameter larger than the diameter of the cylinder bores to be formed, connecting the tubes together over at least part of their contacting surfaces, casting an anti-friction metal alloy into the free spaces of the annular space, removing the base, and machining the cylinder bores in the cast metal within the plurality of steel tubes.
7. The method claimed in claim 6, in which the length of the external cylindrical steel tube is greater than that of the other steel tubes leaving at each end of the mould a space into which the metal alloy is cast and which forms end surfaces of the finished body.
8. A method of manufacturing a cylinder containing body for a multi-piston hydraulic pump or motor, substantially as
hereinbefore described with reference to the
accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7710162A FR2385913A1 (en) | 1977-03-29 | 1977-03-29 | PUMP BODY OR HYDRAULIC MOTOR WITH BARREL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1581320A true GB1581320A (en) | 1980-12-10 |
Family
ID=9189009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11997/78A Expired GB1581320A (en) | 1977-03-29 | 1978-03-28 | Cylinder containing body for a multi-piston hydraulic pumpor motor |
Country Status (4)
| Country | Link |
|---|---|
| DE (2) | DE2813530C2 (en) |
| FR (1) | FR2385913A1 (en) |
| GB (1) | GB1581320A (en) |
| IT (1) | IT1094289B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29509907U1 (en) * | 1995-06-19 | 1996-10-17 | Siemens Ag | Lifting cylinder |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0216740B1 (en) * | 1985-09-02 | 1990-02-28 | Mecanova S.P.R.L. | Cylinder block for a hydraulic wobble plate pump |
| DE4039926C2 (en) * | 1990-09-19 | 1994-08-11 | Elektra Beckum Ag | Axial piston pump, especially for water high-pressure cleaners |
| DE19754593A1 (en) | 1997-12-10 | 1999-07-01 | Kleinedler Peter | Hold-down ring for axial piston machines |
-
1977
- 1977-03-29 FR FR7710162A patent/FR2385913A1/en active Granted
-
1978
- 1978-03-24 IT IT21598/78A patent/IT1094289B/en active
- 1978-03-28 GB GB11997/78A patent/GB1581320A/en not_active Expired
- 1978-03-29 DE DE2813530A patent/DE2813530C2/en not_active Expired
- 1978-03-29 DE DE19787809344U patent/DE7809344U1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29509907U1 (en) * | 1995-06-19 | 1996-10-17 | Siemens Ag | Lifting cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1094289B (en) | 1985-07-26 |
| DE7809344U1 (en) | 1978-09-14 |
| FR2385913B1 (en) | 1980-01-04 |
| DE2813530C2 (en) | 1982-12-02 |
| FR2385913A1 (en) | 1978-10-27 |
| IT7821598A0 (en) | 1978-03-24 |
| DE2813530A1 (en) | 1978-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |