EP0220187A1 - Stromregeleinrichtung für eine rotationskolbenpumpe. - Google Patents
Stromregeleinrichtung für eine rotationskolbenpumpe.Info
- Publication number
- EP0220187A1 EP0220187A1 EP85903836A EP85903836A EP0220187A1 EP 0220187 A1 EP0220187 A1 EP 0220187A1 EP 85903836 A EP85903836 A EP 85903836A EP 85903836 A EP85903836 A EP 85903836A EP 0220187 A1 EP0220187 A1 EP 0220187A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- throttle
- control device
- current control
- section
- 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
- 230000001105 regulatory effect Effects 0.000 title description 2
- 230000001419 dependent effect Effects 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
Definitions
- the invention relates to a flow control device for rotary piston pumps for controlling a useful current, with a bypass flow control valve in which a measuring throttle is arranged.
- Such a current control device is known from DE-PS 24 02 017.
- a rotary piston pump which is provided with such a current control device, has the disadvantage that when the pump starts up, especially at low temperatures, undesirable noises occur.
- the object of the invention is to avoid such start-up noises in rotary piston pumps.
- the bypass flow reclaimed by the flow control valve to the suction side of the pump is only 1 1 / min.
- the pump 7 1 In order to continue to be able to convey 8 1, the pump 7 1 must suck up from the container. At low temperatures, the injector effect of the bypass flow is not sufficient due to the thick liquid of the oil to replenish the required 7 1. The resulting cavitation leads to the undesirable noises.
- a flow control valve with a viscosity-dependent measuring throttle is used according to the invention, so that the cutoff occurs earlier at low temperatures, so that less oil is conveyed to the outside of the consumer. As a result, only a small amount of oil is pumped outwards to the consumer, while the main amount in the bypass flow is fed back to the suction side of the pump. The result is that only a very small amount of oil has to be sucked out of the container, so that no cavitation and no associated noises occur.
- the viscosity dependence of the measuring throttle is achieved in that the flow cross-section of the measuring throttle is small in relation to the surface in the measuring throttle wetted by the oil flow conveyed.
- the wetted surface is determined by the circumference of the flow cross-sectional area and by the length of the Measuring choke. Because of the thicker boundary layer with viscous oil, the influence of the surface is greater than with viscous oil.
- a viscosity-independent orifice is connected upstream of the viscosity-dependent measuring throttle.
- the orifice is used to achieve fine control / while the viscosity-dependent measuring throttle achieves the advantages of noise prevention described above.
- the invention can be implemented particularly simply in that the measuring throttle is designed as a bore with a cross-section which approximately corresponds to the cross-section of the diaphragm and whose length is long compared to the length of the diaphragm and versus the diameter of the hole. This can be achieved particularly easily by means of an angled bore of constant cross-section, the first piece of the bore having a relatively short length and the second, angled piece of the bore having a relatively large length.
- a rod with a polygonal cross section for example a square rod, is inserted into the bore of the measuring throttle, the edges of which lie against the inner wall of the bore.
- Fig. 1 shows a longitudinal section through a rotary piston pump with the inventive 'SEN current control means
- FIG. 5 shows a diagram with the dependence of the delivery flow on the oil temperature and on the pump speed.
- a cam ring 5 is arranged between two end plates 3 and 4.
- a pin 6 secures the cam ring 5 and the two end plates 3 and 4 against rotation.
- In the cam ring 5 there is a cylindrical rotor 8 connected to a drive shaft 7 stored.
- Working slides or vanes 9 are guided in radially movable fashion in slots of the rotor 8.
- a pressure chamber 10 is formed in the housing 1 between the second end plate 4 and the cover 2 and is connected to a pressure channel 13 via passages 11 and 12 in the end plates 4 and 3.
- a flow control valve 14 directs excess pressure medium from the pressure channel 13 into an intake channel 15 depending on the speed.
- a cylindrical throttle insert 16 is arranged with a removal and throttling orifice 17, in the further description called orifice 17.
- the throttle insert 16 in the exemplary embodiment lies transversely to the axis of the pressure channel 13.
- the position of the throttle insert 16 with respect to the axis of the pressure channel 13 is not essential to the invention and can also be selected differently according to the requirements.
- the screen 17 can be arranged directly in the housing 1.
- pressure medium is passed from the pump to a consumer 18, which is formed, for example, by a power steering system.
- a damping throttle Via a damping throttle, not shown in the drawing, a reduced pressure is transmitted in a known manner through a control line 19 from a pressure line 20 leading to the consumer 18 to the rear of the flow control valve 14.
- a measuring throttle 21 connects to the orifice 17 for a viscosity-dependent delivery rate.
- the measuring throttle 21 is designed as a bore 22, the cross section of which corresponds approximately to the cross section of the diaphragm 17.
- the length of the measuring throttle 21 is large compared to the length of the measuring orifice and compared to the diameter of the bore 22.
- the cross-sectional area of the diaphragm 17 is larger than approximately 20: 1.
- the measuring throttle is designed as a bore 23 into which a square rod 24 is inserted, the longitudinal edges of which bear against the inner wall of the bore 23.
- four circular section surfaces 25 are formed between the bore 23 and the square rod 24 and determine the flow cross section through the measuring throttle 21.
- the use of a square rod has proven to be particularly advantageous because the viscosity-dependent friction in relation to the size of the throttle is even more favorable than in the first exemplary embodiment.
- a round rod an annular flow-through surface being formed between the outer circumferential surface of the round rod and the inner wall of the bore 23.
- the reduction of the flow rate begins earlier at low temperatures, i. H. even at a lower volume than at higher temperatures.
- the regulation is always carried out with the same pressure difference. Because a smaller amount is conveyed to the outside of the consumer 18, less oil has to be drawn in from the oil container. The injector effect of the bypass flow is sufficient for this lower oil quantity, so that cavitation is almost completely prevented.
- Fig. 5 The influence of the flow control device according to the invention on the flow is shown in Fig. 5. This shows to what extent the flow rate V is regulated earlier at a temperature of 20 ° C than at a temperature of 80 ° C. As a result, a large part of the oil produced is circulated in the pump at low temperatures.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
- Flow Control (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
WOPCT/EP84/00246 | 1984-08-11 | ||
EP8400246 | 1984-08-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0220187A1 true EP0220187A1 (de) | 1987-05-06 |
EP0220187B1 EP0220187B1 (de) | 1991-02-06 |
Family
ID=8164961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85903836A Expired - Lifetime EP0220187B1 (de) | 1984-08-11 | 1985-07-30 | Stromregeleinrichtung für eine rotationskolbenpumpe |
Country Status (6)
Country | Link |
---|---|
US (1) | US4715793A (de) |
EP (1) | EP0220187B1 (de) |
JP (1) | JPH0811959B2 (de) |
BR (1) | BR8507226A (de) |
DE (2) | DE3527225A1 (de) |
WO (1) | WO1986001261A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02230995A (ja) * | 1989-03-02 | 1990-09-13 | Mitsubishi Heavy Ind Ltd | ヒートポンプ用圧縮機及びその運転方法 |
JPH0350587U (de) * | 1989-09-26 | 1991-05-16 | ||
JP2851903B2 (ja) * | 1990-03-14 | 1999-01-27 | 株式会社ユニシアジェックス | 液体ポンプ |
US5161959A (en) * | 1991-03-11 | 1992-11-10 | Ford Motor Company | Viscosity sensitive hydraulic pump flow control |
DE4209839A1 (de) * | 1992-03-26 | 1993-09-30 | Zahnradfabrik Friedrichshafen | Stromregelventil |
DE4416077A1 (de) * | 1994-05-06 | 1995-11-09 | Zahnradfabrik Friedrichshafen | Flügelzellenpumpe |
DE19747341A1 (de) * | 1997-10-27 | 1999-04-29 | Zahnradfabrik Friedrichshafen | Regeleinrichtung für Verdrängerpumpen |
US5964198A (en) * | 1998-04-29 | 1999-10-12 | Industrial Technology Research Institute | Lubrication system of internal combustion engine |
DE19909963B4 (de) * | 1999-03-06 | 2006-12-21 | Zf Friedrichshafen Ag | Verdrängerpumpe |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3314495A (en) * | 1964-12-07 | 1967-04-18 | Trw Inc | Valving system for power steering pump |
US3349714A (en) * | 1965-10-11 | 1967-10-31 | Ford Motor Co | Power steering pump |
DE1653811A1 (de) * | 1967-08-23 | 1971-05-19 | Bosch Gmbh Robert | Verdraengerpumpe |
JPS5034250B1 (de) * | 1969-04-01 | 1975-11-07 | ||
DE2402017C2 (de) * | 1974-01-17 | 1983-03-31 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Stromregeleinrichtung für eine Rotationskolbenpumpe, insbesondere für Servolenkungen von Kraftfahrzeugen |
US3989414A (en) * | 1975-03-26 | 1976-11-02 | Zahnradfabrik Friedrichshafen Ag | Pump for servo steering |
DE3034115A1 (de) * | 1980-09-11 | 1982-05-19 | Mannesmann Rexroth GmbH, 8770 Lohr | Leistungsregler |
JPS585115U (ja) * | 1981-07-03 | 1983-01-13 | 株式会社ユ−シン | 操作レバ−の組付構造 |
-
1985
- 1985-07-30 JP JP60503537A patent/JPH0811959B2/ja not_active Expired - Fee Related
- 1985-07-30 US US06/857,756 patent/US4715793A/en not_active Expired - Lifetime
- 1985-07-30 WO PCT/EP1985/000384 patent/WO1986001261A1/de active IP Right Grant
- 1985-07-30 BR BR8507226A patent/BR8507226A/pt unknown
- 1985-07-30 EP EP85903836A patent/EP0220187B1/de not_active Expired - Lifetime
- 1985-07-30 DE DE19853527225 patent/DE3527225A1/de not_active Withdrawn
- 1985-07-30 DE DE8585903836T patent/DE3581739D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8601261A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH0811959B2 (ja) | 1996-02-07 |
DE3527225A1 (de) | 1986-02-20 |
JPS62500116A (ja) | 1987-01-16 |
US4715793A (en) | 1987-12-29 |
DE3581739D1 (de) | 1991-03-14 |
BR8507226A (pt) | 1987-08-04 |
WO1986001261A1 (en) | 1986-02-27 |
EP0220187B1 (de) | 1991-02-06 |
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