WO2012163343A1 - Radial piston pump - Google Patents
Radial piston pump Download PDFInfo
- Publication number
- WO2012163343A1 WO2012163343A1 PCT/DE2012/100135 DE2012100135W WO2012163343A1 WO 2012163343 A1 WO2012163343 A1 WO 2012163343A1 DE 2012100135 W DE2012100135 W DE 2012100135W WO 2012163343 A1 WO2012163343 A1 WO 2012163343A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radial piston
- suction chamber
- piston pump
- interior
- cylinder block
- Prior art date
Links
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
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/24—Bypassing
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/08—Cooling; Heating; Preventing freezing
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/18—Lubricating
Definitions
- the invention relates to a radial piston pump according to the preamble of claim 1.
- Radial piston pumps of the type discussed here serve the promotion of a medium. They have a housing arranged in a cylinder block and an interior space inside the cylinder block, a suction chamber and at least one supply line, which is in fluid communication with the suction chamber. In the cylinder block at least one radial piston is movably arranged, which is in fluid communication with the suction chamber and serves to suck a medium from the supply line and to promote a consumer.
- Known embodiments have in the interior an eccentric which cooperates with a rotatably mounted in the cylinder block drive shaft.
- the at least one radial piston is pressed by the force of a piston spring against the outer surface of the eccentric.
- the radial piston is first moved against the force of the piston spring in the radial direction to the outside.
- the radial piston is moved by the force of the piston spring in the radial direction inwards.
- the radial piston is thus offset by the drive shaft via the eccentric in an oscillating movement extending in the radial direction.
- the suction chamber is filled via the supply line with the medium, preferably a hydraulic medium, in particular hydraulic oil.
- the radially inwardly directed movement of the radial piston creates a negative pressure in the suction chamber.
- the medium is sucked in via the fluid connection between radial piston and suction chamber from the suction chamber.
- the sucked medium is ejected into a pressure range and can be made available to a consumer.
- the friction between the movable components of the radial piston pump, in particular between eccentric and radial piston and between the latter and the cylinder block leads to undesirable heat development inside the pump.
- the cylinder which is remote from a suction connection, and the eccentric space, which is not flown through, are partly underserved by the hydraulic medium or collect air bubbles or air dead spaces.
- the invention is therefore an object of the invention to provide a radial piston pump in which simple and inexpensive means, the moving components are lubricated, also vents the interior and heat is dissipated from the interior and not traversed dead spaces are avoided without affecting the performance of Radial piston pump thereby deteriorated.
- a radial piston pump is provided with the features of claim 1. It has a cylinder block, an interior, in which in particular drive shaft and eccentric are arranged, a suction chamber, at least one supply line in fluid communication with the suction chamber and at least one movable in the cylinder block radial piston, which is in fluid communication with the suction chamber and in particular by the Eccentric is moved radially back and forth. It is characterized in that the suction chamber is adjacent to the cylinder block and has two sections, of which only the first section is directly in fluid communication with the supply line. The second section of the suction chamber can therefore not be filled directly via the supply line with the medium. The two sections are separated by two predeterminable flow resistances.
- the flow resistances can the two sections more or less against each other.
- at least a first fluid connection between the first portion of the suction chamber and the interior and at least one second fluid connection between the second portion of the suction chamber and the interior is provided in the cylinder block.
- the at least one first fluid connection and the at least one second fluid connection are connected to one another via the interior of the radial piston pump or via the eccentric.
- At least one of the two predeterminable flow resistances is adjustable so that the at least one radial piston discharges the medium both via the first section of the suction chamber - ie directly from the supply line (direct filling) and via the second section of the suction chamber - ie from the interior of the radial piston pump (indirect filling) - sucks.
- At least one of the Strömungswidenote is adjustable so that the at least one radial piston sucks the medium only over the second portion of the suction chamber, so only from the interior of the radial piston pump (indirect filling).
- forced lubrication or cooling is effected by the adjustment of the flow resistances by the radial piston pump according to the invention.
- the medium or the hydraulic medium is conveyed through the interior, so that in each case the eccentric and in particular its storage, is exposed to a hydraulic medium flow, which acts lubricating and cooling. At the same time, the hydraulic medium flow ensures that the interior or eccentric chamber is vented.
- At least one of the two flow resistances is designed as a web. This can be arranged on an inner surface of the suction chamber or of the housing. It is also conceivable that the web is arranged on the outer surface of the cylinder block and protrudes into the suction chamber. Size and shape of the web determine the flow resistance.
- an embodiment is preferred in which the at least one radial piston sucks the medium via a suction valve from the suction chamber.
- a defined suction pressure control of the conveyed medium can be defined.
- Radial piston is provided, of which at least one is in flow communication with the first and at least one with the second portion of the suction chamber.
- an exemplary embodiment is preferred in which the number of radial pistons in fluid communication with the first and second sections is matched to the desired cooling capacity and lubricating power, in particular in the eccentric chamber. If there is a lot of waste heat during operation of the radial piston pump, a larger number of radial pistons are assigned to the second section of the suction chamber, which sucks the medium through the interior of the pump, so that more hydraulic fluid flows through the eccentric chamber. Accordingly, this number can be reduced if less waste heat or lubricating oil requirement arises on the eccentric.
- the adjacent to the cylinder block suction chamber is preferably at least in
- the suction chamber adjacent to the cylinder block at least substantially surrounds the cylinder block, that is at least substantially radially arranged on the cylinder block, in which case the fluid connections preferably extend radially to the interior.
- a radial piston pump in which a volume flow through the fluid connections (19, 21) over the interior (7) and the eccentric (9) is guided. Furthermore, the internal space (7) is vented via the fluid connections (19, 21) and the eccentric (9) and the plain bearing are lubricated and cooled.
- FIG. 2 shows a longitudinal section through a radial piston pump according to a
- Figure 3 shows a cross section through the radial piston pump according to the alternative
- FIG. 1 The sectional view according to FIG. 1 shows a radial piston pump 1
- the at least one radial piston R is pressed by a - not shown here - the piston spring radially inwardly against the outer surface of the eccentric 9.
- the eccentric 9 rotates with the drive shaft 1 1, so that the at least one radial piston R is periodically pressed outward.
- the drive shaft 1 1 of the radial piston via the eccentric against the force of the piston spring moves in the radial direction outward and moved in a further rotation of the eccentric 9 by the force of the piston spring back inwards.
- a rotation of the eccentric 9 to the drive shaft 1 1 thus there is a running in the radial direction of oscillating movement of the radial piston R.
- the radial piston R By the inward movement of the radial piston R is formed in the suction chamber 13, a negative pressure.
- the radial piston R sucks a medium, preferably a hydraulic oil, from the suction chamber 13.
- the suction chamber 13 is filled via the supply line 15 with hydraulic oil. Due to the outward movement of the radial piston, the hydraulic oil is then compressed and ejected into a pressure chamber. In a suitable and known manner, for example by valves, it is prevented that a sucked from the suction chamber medium is pressed back into this.
- the peculiarity of the radial piston pump 1 is that the suction chamber 13 is divided by two predeterminable flow resistances 17a and 17b into two separate sections 13a and 13b, of which only a first section 13a is directly in fluid communication with the supply line 15.
- the at least one radial piston can therefore suck in hydraulic oil directly from the supply line 15 only via the first section 13a.
- the flow resistances 17a and 17b can be selected so that no or just a defined media exchange can take place between the two sections 13a and 13b of the suction chamber 13.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of the medium.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of the medium.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of the medium.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of the medium.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of the medium.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of the medium.
- Radial piston pump 1 is sucked, the greater the cooling capacity in the eccentric chamber and at the lower sides of the piston during the suction of
- Interior 7 at least a first fluid connection 19.
- runs in the cylinder block 5 between the second portion 13 b and the inner space 7 at least one second fluid connection 21st
- the at least two fluid connections 19, 21 are therefore in communication with each other via the interior 7.
- three first fluid connections 19 and three second fluid connections 21 are provided.
- the number of fluid connections 19, 21 can be varied according to the intended use of the radial piston pump 1 or the number of pistons and cylinder chambers.
- the eccentric 9 If the eccentric 9 is rotated by the drive shaft 1 1, it presses the radial piston R against the force of the piston spring to the outside. Upon further rotation of the drive shaft 1 1, the piston spring presses the radial piston R inwardly against the outer surface of the eccentric 9. The radial piston R is thus placed in a periodic inward and outward movement, wherein it slides in radially extending cylinder bores.
- the at least one radial piston sucks the medium, in particular the hydraulic oil, out of the suction chamber 13.
- the radial piston R sucks the hydraulic oil through a suction valve from the suction chamber 13.
- the suction chamber 13 is filled via the supply line 15 with the hydraulic oil.
- the radial piston R can only draw hydraulic oil directly from the supply line 15 when it is in fluid communication with the first portion 13a.
- hydraulic oil is sucked in from the interior 7 via the at least one second fluid connection 21, into which it passes from the first section 13a via the at least one first fluid connection 19. If the radial piston R in fluid communication with the second portion 13b, so there is a negative pressure in the radial inward movement there, and hydraulic oil is from the first portion 13a of the suction chamber 13 via the first fluid connection 19, the interior 7 and second fluid connection 21 flow into the second section 13b. This can be influenced via one of the two or both flow resistances 17a, 17b. The corresponding volume flow can thus be influenced by the predeterminable flow resistance 17a, 17b. Thus, a volume flow between the two sections 13a, 13b generated by the interior 7 of the radial piston pump 1.
- At least one of the two flow resistances 17a, 17b can be preselected or adjusted such that the at least one radial piston R draws in hydraulic oil both through the first section 13a directly from the supply line 15 and indirectly through the interior 7 via the second section 13b.
- the volume flow through the interior 7 can be influenced by means of the flow resistances 17a, 17b so that a sufficient heat dissipation from the interior 7 is ensured.
- the flow resistances 17a, 17b are formed, for example, as webs, beads, ribs or the like. These can be arranged on the outer surface of the cylinder block 5 and / or on the inner surface of the suction chamber 13 or of the housing 3. It is also conceivable that at least one of the two flow resistances 17a, 17b is composed of two webs, one of which is arranged on the outer surface of the cylinder block 5 and the other on the inner surface of the housing 3. The volume flow over the respective flow resistance 17a, 17b is then influenced by its size and / or shape. It is also possible that one of the two flow resistances 17a, 17b separates the two sections 13a, 13b of the suction space 13 tightly from one another.
- the flow resistances 17a, 17b are preferably formed integrally with the cylinder block or the housing. According to a preferred alternative, not shown embodiment, the flow resistances 17a, 17b are formed as separate components, which are preferably inserted into corresponding recesses in the housing or in the cylinder block for their attachment and orientation. It is possible to provide a press fit to hold the flow resistances 17a, 17b frictionally in the respective recess. Of course, it is also conceivable to determine the flow resistances 17a, 17b by providing adhesive, welding spots or the like on the housing or the cylinder block or in the respective recess.
- first fluid connections 19 and three second fluid connections 21 are provided.
- These fluid connections 19, 21 are designed here as radial bores. Number, diameter and shape of these fluid connections 19, 21 influence the guided through the interior 7 volume flow.
- the ratio of the volume flows which flow on the one hand via the two flow resistances 17a, 17b and on the other hand through the inner space 7 between the two sections 13a, 13b of the suction space 13 can be influenced .
- the volume flows can be selected such that sufficient lubrication and heat removal from the interior 7 or from the cylinder block 5 is always ensured at the respective delivery rate of the radial piston pump 1.
- a ventilation of the interior 7 is ensured.
- the radial piston pump 1 Due to the configuration of the radial piston pump 1, it is thus possible to adjust the volume flows within the radial piston pump through the flow resistances 17a and 17b and through the configuration of the fluid connections 19 and 21 in the conveyance of a medium from the supply line 15 to a consumer that sufficient cooling the radial piston pump 1 and a venting of the interior 7 is ensured, even if only a single radial piston R is provided, which is then preferably in fluid communication with the second portion 13b of the suction chamber 13 and there sucks the medium. In the second section 13b of the suction chamber 13, the medium can then flow via the at least one flow resistance 17a or 17b from the first section 13a into the second section 13b. Depending on the cooling requirement, a part of the volume flow can also flow through the interior of the radial piston pump 1 and provide for cooling and lubrication or ventilation.
- the radial piston pump 1 is provided that the first portion 13a make up about two thirds and the second portion 13b about one third of the volume of the suction chamber 13.
- the ratio of the volumes of the two sections 13a, 13b can be adjusted as required by suitable positioning of the flow resistances 17a, 17b, as viewed in the circumferential direction.
- the distance between a flow resistance 17a, 17b and the supply line 15 opening into the suction space 13 also influences the volume flow flowing through this flow resistance 17a, 17b.
- a plurality of radial pistons to be arranged in the cylinder block 5.
- FIG. 1 shows a simplified longitudinal sectional view of the radial piston pump 1 according to a second embodiment.
- the suction chamber 13 is arranged substantially axially on the cylinder block 5, so that the flow resistances 17a, 17b are provided at least substantially at an axial end wall of the cylinder block 5.
- the housing 3 extends over the cylinder block 5 in such a way that the suction chamber 13 to a small extent also surrounds the cylinder block 5.
- the eccentric 9 carries a sliding bearing 10, which is lubricated and cooled by the volume flow which is supplied through the connections 19 to the interior 7 and discharged via the connections 21. In addition to the heat generated in the sliding bearing and air pockets are removed from the interior 7 by the flow.
- Figure 3 shows a plan view of the cylinder block of the radial piston pump 1 according to the alternative embodiment, wherein it can be seen here that the flow resistances 17a, 17b extend radially to the axis of rotation of the eccentric 9 and the fluid connections 19, 21 axially.
- the flow resistances 17a, 17b subdivide the suction space 13 into a first section 13a and a second section 13b.
- a further radial piston R is also provided, so that according to the present embodiment, the radial piston pump 1 has seven radial piston.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112012002260.2T DE112012002260A5 (en) | 2011-05-27 | 2012-05-10 | RADIAL PISTON PUMP |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011050688.8 | 2011-05-27 | ||
DE102011050688 | 2011-05-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012163343A1 true WO2012163343A1 (en) | 2012-12-06 |
Family
ID=46275649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2012/100135 WO2012163343A1 (en) | 2011-05-27 | 2012-05-10 | Radial piston pump |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112012002260A5 (en) |
WO (1) | WO2012163343A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1653379A1 (en) * | 1967-05-13 | 1971-07-01 | Bosch Gmbh Robert | Hydraulic piston pump with a throttle element arranged in the suction line |
US4430047A (en) * | 1979-12-19 | 1984-02-07 | Zahndradfabrik Friedrichshafen Ag | Pump arrangement |
US5156531A (en) * | 1988-09-15 | 1992-10-20 | Zahnradfabrik Friedrichshafen, Ag. | Radial piston pump |
-
2012
- 2012-05-10 WO PCT/DE2012/100135 patent/WO2012163343A1/en active Application Filing
- 2012-05-10 DE DE112012002260.2T patent/DE112012002260A5/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1653379A1 (en) * | 1967-05-13 | 1971-07-01 | Bosch Gmbh Robert | Hydraulic piston pump with a throttle element arranged in the suction line |
US4430047A (en) * | 1979-12-19 | 1984-02-07 | Zahndradfabrik Friedrichshafen Ag | Pump arrangement |
US5156531A (en) * | 1988-09-15 | 1992-10-20 | Zahnradfabrik Friedrichshafen, Ag. | Radial piston pump |
Also Published As
Publication number | Publication date |
---|---|
DE112012002260A5 (en) | 2014-03-06 |
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