EP1452733B1 - Swash plate axial piston pump - Google Patents
Swash plate axial piston pump Download PDFInfo
- Publication number
- EP1452733B1 EP1452733B1 EP04003510A EP04003510A EP1452733B1 EP 1452733 B1 EP1452733 B1 EP 1452733B1 EP 04003510 A EP04003510 A EP 04003510A EP 04003510 A EP04003510 A EP 04003510A EP 1452733 B1 EP1452733 B1 EP 1452733B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- swash plate
- pump
- axial piston
- disk
- rotation axis
- 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 - Lifetime
Links
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- -1 zinc-manganese-aluminum Chemical compound 0.000 description 1
Images
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
- F04B1/14—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 stationary cylinders
- F04B1/141—Details or component parts
- F04B1/146—Swash plates; Actuating elements
-
- 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
- F04B1/128—Driving 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
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
Definitions
- the present invention relates to a swash plate for axial piston pump.
- the pump is constituted by a pump body in which the cylinder block is arranged so that it is aligned with the rotation axis of the oscillating swash plate.
- the pistons are arranged inside the cylinder block and their external head is in contact with the thrust bearing of a roller bearing that is arranged on an annular surface portion that is inclined with respect to the rotation axis of the swash plate and is formed on the swash plate.
- the pistons are associated with return springs for retracting outward the cylinder block.
- the swash plate is provided centrally with a hub on which the rotation pivot of the swash plate is locked.
- a crown gear is further locked on the pivot, substantially on the opposite side with respect to the swash plate, and meshes with a pinion that is functionally connected to the electric motor of the pump.
- the coupling between the swash plate, the pivot and the crown gear is particularly difficult.
- these components are made of metallic material (the swash plate is cast from a zinc-manganese-aluminum alloy and the crown gear is made of sintered steel) and their manufacturing costs are not negligible with respect to the total manufacturing cost of the entire pump.
- US-A-3 643 433 discloses a swashplate pump with a pump body and an oscillating swash plate comprising a rotating disk-like body in which an annular seat is provided that is inclined with respect to the rotation axis of said disk-like body and on which there are accommodated sliding means for the heads of axial pistons, said pump being functionally connected to motor means, said swash plate comprising, monolithically with said disk-like body, a toothed circumferential portion that is coaxial to said rotation axis.
- the aim of the present invention is to provide an oscillating swash plate for an axial piston pump that solves the problems described above in known types.
- an object of the present invention is to provide an oscillating swash plate for an axial piston pump that reduces the concentricity errors produced in the coupling of the components of the pump and reduces the rotating masses.
- Another object of the present invention is to provide an oscillating swash plate for an axial piston pump that can be manufactured at a lower cost than currently manufactured swash plates.
- Another object of the present invention is to provide an oscillating swash plate for an axial piston pump that can be manufactured with known systems and technologies.
- an axial piston pump of the swash plate type with an oscillating swash plate according to claim 1 is provided.
- an oscillating swash plate for axial piston pumps is generally designated by the reference numeral 10.
- the swash plate 10 is accommodated inside a pump body 11 and is of the inclined-plane type.
- the swash plate 10 is formed by a rotating disk-like body 10a on which a central hub 12 is formed.
- the central hub 12 has an axial through hole for coupling to a rotation pivot 13 that is pivoted to the pump body 11.
- the disk-like body 10a has an annular seat 14 that is inclined with respect to the rotation axis 15 of said disk-like body and is formed on two different mutually parallel levels 14a and 14b.
- the pistons 20 are inserted slidingly within a cylinder block 20a, which is fixed to the pump body 11 by way of brackets, and are associated with return springs 20b.
- Said sliding means are constituted by a first thrust bearing 16 on which a roller cage 17 rests; in turn, a second thrust bearing 18 rests on the roller cage 17 and is directly in contact with the heads 19 of the pistons 20.
- the swash plate 10 comprises, on the peripheral region of the disk-like body 10a, which is formed monolithically therewith, a toothed circumferential portion 21 that is coaxial to the rotation axis 15.
- the toothed circumferential portion 21 mates kinematically with an actuation gear 22, for example a pinion, that is functionally connected to pump motor means 30, such as for example an electric motor, by way of a shaft 23.
- actuation gear 22 for example a pinion
- pump motor means 30 such as for example an electric motor
- the swash plate 10 is made of plastics and is preferably injection-molded.
- Figures 3 and 4 illustrate an embodiment of a swash plate (designated by the reference numeral 110) that can be used in a pump body that is different from the one described earlier.
- the swash plate 110 comprises, on the peripheral region of a disk-like body 110a and formed monolithically therewith, a toothed circumferential portion 121 that is coaxial to a rotation axis 115.
- This solution allows to eliminate the problems related to concentricity errors between the swash plate and the ring gear and to simplify production, eliminating the step for assembling said components (in addition to eliminating assembly costs).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
- The present invention relates to a swash plate for axial piston pump.
- Currently, in the field of axial piston pumps there are three main constructive solutions: pumps with an inclined swash plate and an aligned oscillating cylinder block, pumps with a perpendicular swash plate and an inclined cylinder block, and pumps with an oscillating swash plate and an aligned fixed cylinder block.
- With reference to this last constructive solution, the pump is constituted by a pump body in which the cylinder block is arranged so that it is aligned with the rotation axis of the oscillating swash plate.
- The pistons are arranged inside the cylinder block and their external head is in contact with the thrust bearing of a roller bearing that is arranged on an annular surface portion that is inclined with respect to the rotation axis of the swash plate and is formed on the swash plate.
- The pistons are associated with return springs for retracting outward the cylinder block.
- The swash plate is provided centrally with a hub on which the rotation pivot of the swash plate is locked.
- A crown gear is further locked on the pivot, substantially on the opposite side with respect to the swash plate, and meshes with a pinion that is functionally connected to the electric motor of the pump.
- Although this pump configuration has been available commercially for some time and is appreciated because of its characteristics, it has aspects that can be improved.
- For example, the coupling between the swash plate, the pivot and the crown gear is particularly difficult.
- During the assembly of these components it is in fact necessary to try to reduce the concentricity errors produced during mutual coupling.
- These concentricity errors cannot always be eliminated acceptably and lead to imbalances of the rotating masses, with consequent problems in terms of vibration, bearing wear, et cetera.
- Moreover, these components are made of metallic material (the swash plate is cast from a zinc-manganese-aluminum alloy and the crown gear is made of sintered steel) and their manufacturing costs are not negligible with respect to the total manufacturing cost of the entire pump.
- US-A-3 643 433 discloses a swashplate pump with a pump body and an oscillating swash plate comprising a rotating disk-like body in which an annular seat is provided that is inclined with respect to the rotation axis of said disk-like body and on which there are accommodated sliding means for the heads of axial pistons, said pump being functionally connected to motor means, said swash plate comprising, monolithically with said disk-like body, a toothed circumferential portion that is coaxial to said rotation axis.
- The aim of the present invention is to provide an oscillating swash plate for an axial piston pump that solves the problems described above in known types.
- Within this aim, an object of the present invention is to provide an oscillating swash plate for an axial piston pump that reduces the concentricity errors produced in the coupling of the components of the pump and reduces the rotating masses.
- Another object of the present invention is to provide an oscillating swash plate for an axial piston pump that can be manufactured at a lower cost than currently manufactured swash plates.
- Another object of the present invention is to provide an oscillating swash plate for an axial piston pump that can be manufactured with known systems and technologies.
- In accordance with the invention, there is provided an axial piston pump of the swash plate type with an oscillating swash plate according to claim 1.
- Further characteristics and advantages of the present invention will become better apparent from the following detailed description of a preferred but not exclusive embodiment thereof, illustrated by way of nonlimiting example in the accompanying drawings, wherein:
- Figure 1 is a partially sectional view of the portion of the pump where the swash plate acts;
- Figure 2 is an exploded view of the portion of the pump where the swash plate acts;
- Figure 3 is a plan view of a swash plate according to the invention, which can be used in a pump that is different from the one shown in the preceding figures;
- Figure 4 is a sectional view, taken along the line III-III of Figure 3.
- With reference to the figures, an oscillating swash plate for axial piston pumps according to the invention is generally designated by the
reference numeral 10. - The
swash plate 10 is accommodated inside apump body 11 and is of the inclined-plane type. - In practice, the
swash plate 10 is formed by a rotating disk-like body 10a on which acentral hub 12 is formed. - The
central hub 12 has an axial through hole for coupling to arotation pivot 13 that is pivoted to thepump body 11. - The disk-
like body 10a has anannular seat 14 that is inclined with respect to therotation axis 15 of said disk-like body and is formed on two different mutuallyparallel levels - Means for the sliding of
heads 19 ofaxial pistons 20 of the pump formed by thebody 11 are accommodated in theannular seat 14. - The
pistons 20 are inserted slidingly within acylinder block 20a, which is fixed to thepump body 11 by way of brackets, and are associated withreturn springs 20b. - Said sliding means are constituted by a first thrust bearing 16 on which a
roller cage 17 rests; in turn, a second thrust bearing 18 rests on theroller cage 17 and is directly in contact with theheads 19 of thepistons 20. - The
swash plate 10 comprises, on the peripheral region of the disk-like body 10a, which is formed monolithically therewith, a toothedcircumferential portion 21 that is coaxial to therotation axis 15. - The toothed
circumferential portion 21 mates kinematically with anactuation gear 22, for example a pinion, that is functionally connected to pump motor means 30, such as for example an electric motor, by way of ashaft 23. - Advantageously, the
swash plate 10 is made of plastics and is preferably injection-molded. - Figures 3 and 4 illustrate an embodiment of a swash plate (designated by the reference numeral 110) that can be used in a pump body that is different from the one described earlier.
- Likewise, the
swash plate 110 comprises, on the peripheral region of a disk-like body 110a and formed monolithically therewith, a toothedcircumferential portion 121 that is coaxial to arotation axis 115. - In practice it has been found that the invention thus described solves the problems noted in known types.
- It should be noted that a single component has been provided which comprises both the swash plate and the crown gear.
- This solution allows to eliminate the problems related to concentricity errors between the swash plate and the ring gear and to simplify production, eliminating the step for assembling said components (in addition to eliminating assembly costs).
- Moreover, providing the swash plate and the crown gear monolithically leads to a reduction of the rotating masses, decreasing all the related negative phenomena, including stresses on the bearings, vibrations, and noise.
- It should be noted that making the invention out of plastics also leads to a reduction in rotating masses and in any case to a production cost of the swash plate that is lower than known types of plate.
- In practice, the materials employed, so long as they are compatible with the specific use, as well as the dimensions, may be any according to requirements and to the state of the art,
- Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.
Claims (2)
- An axial piston pump of the swash plate type with a pump body (11) and an oscillating swash plate (10) comprising a rotating disk-like body (10a) in which an annular seat (14) is provided that is inclined with respect to the rotation axis (15) of said disk-like body (10a) and on which there are accommodated sliding means (16, 17) for the heads (19) of axial pistons (20), said pump (11) being functionally connected to motor means (30), said swash plate (10) comprising, monolithically with said disk-like body (10a), a toothed circumferential portion (21) that is coaxial to said rotation axis (15), said toothed circumferential portion (21) being coupled kinematically to an actuation gear (22) connected to said motor means of said pump, and a central hub (12) formed on said disk-like body (10a) which is coupled to rotation pivot (13) of the pump body (11).
- An axial piston pump according to claim 1, characterized in that said swash plate (10) is made of plastics.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPD20030013 | 2003-01-24 | ||
IT000013U ITPD20030013U1 (en) | 2003-02-25 | 2003-02-25 | SWING PLATE FOR AXIAL PISTON PUMP |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1452733A1 EP1452733A1 (en) | 2004-09-01 |
EP1452733B1 true EP1452733B1 (en) | 2006-07-12 |
Family
ID=32800723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04003510A Expired - Lifetime EP1452733B1 (en) | 2003-02-25 | 2004-02-17 | Swash plate axial piston pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040165996A1 (en) |
EP (1) | EP1452733B1 (en) |
AT (1) | ATE333049T1 (en) |
DE (1) | DE602004001469T2 (en) |
IT (1) | ITPD20030013U1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005041982A1 (en) * | 2005-09-05 | 2007-03-08 | Robert Bosch Gmbh | Piston pump with swash plate drive |
DE202006005682U1 (en) | 2006-04-05 | 2006-06-14 | Lincoln Gmbh & Co. Kg | Lubricant or hydraulic pump |
US20100014998A1 (en) * | 2008-07-21 | 2010-01-21 | Michael Conner | Diaphragm pump |
CN107401491A (en) * | 2017-09-24 | 2017-11-28 | 英立(江苏)机电有限公司 | A kind of oil drilling slush pump |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB676612A (en) * | 1946-05-03 | 1952-07-30 | Electraulic Presses Ltd | Improvements in and relating to hydraulic pumps and motors |
CH510216A (en) * | 1969-05-10 | 1971-07-15 | Bosch Gmbh Robert | Hydrostatic unit |
DE9013630U1 (en) * | 1990-09-28 | 1991-01-31 | Speck-Kolbenpumpenfabrik Otto Speck GmbH & Co. KG, 8192 Geretsried | High pressure liquid pump |
DK0764059T3 (en) * | 1994-06-17 | 1999-08-16 | Kaercher Gmbh & Co Alfred | High pressure washer with safety insulation |
-
2003
- 2003-02-25 IT IT000013U patent/ITPD20030013U1/en unknown
-
2004
- 2004-02-17 AT AT04003510T patent/ATE333049T1/en not_active IP Right Cessation
- 2004-02-17 EP EP04003510A patent/EP1452733B1/en not_active Expired - Lifetime
- 2004-02-17 DE DE602004001469T patent/DE602004001469T2/en not_active Expired - Fee Related
- 2004-02-18 US US10/779,704 patent/US20040165996A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP1452733A1 (en) | 2004-09-01 |
ITPD20030013U1 (en) | 2004-08-26 |
DE602004001469T2 (en) | 2006-11-16 |
ATE333049T1 (en) | 2006-08-15 |
US20040165996A1 (en) | 2004-08-26 |
DE602004001469D1 (en) | 2006-08-24 |
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