EP0822334B1 - Zahnradpumpe - Google Patents
Zahnradpumpe Download PDFInfo
- Publication number
- EP0822334B1 EP0822334B1 EP97112978A EP97112978A EP0822334B1 EP 0822334 B1 EP0822334 B1 EP 0822334B1 EP 97112978 A EP97112978 A EP 97112978A EP 97112978 A EP97112978 A EP 97112978A EP 0822334 B1 EP0822334 B1 EP 0822334B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear pump
- pressure
- pump
- relief valve
- pressure relief
- 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
Images
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
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/50—Power-operated mechanisms for wings using fluid-pressure actuators
Definitions
- the invention relates to a hydraulic gear pump, in particular for door operating devices according to the preamble of the main claim.
- Hydraulic gear pumps are used in door actuators successfully used for a long time.
- This hydraulic Gear pumps are powered by a drive, for example an electric motor, driven and pumping under pressure hydraulic fluid towards a pistoned one Cylinder, which in turn with further connection elements, such as a toggle lever, with the one to be operated Door is connected.
- a drive for example an electric motor
- the hydraulic fluid is supplied, this caused an opening the door to be operated, the hydraulic fluid z. B. is promoted with a pressure of 35 bar.
- the hydraulic Liquid is pumped in a cycle, i.e. H. the hydraulic fluid is then fed through a suction line fed back to the hydraulic gear pump.
- the door drives are aligned that a swinging door is not the same until the very end Opening speed as in their middle range of motion has, but the door is about to be reached their maximum opening position with reduced speed moved to an abrupt hard braking of the Avoid the door when it reaches its maximum opening position. This also applies when a door is closed to to avoid loud and material slamming the door. During these phases the door will not move demands the full pump output of the hydraulic gear pump. A reduction in pump performance via a corresponding one Adjustment of the pump drive, e.g. B. one Electric motor, would be due to the required control devices costly and therefore disadvantageous.
- the known door actuators a pressure relief valve on the gear pumps is connected to a harmful increase in the Avoid hydraulic fluid pressure if not the full pump power is required. In doing so, they effect Pressure relief valves that with an increase in the Gear pump pumped hydraulic fluid pressure a pressure relief valve opens and in the sense of a Bypass hydraulic fluid from the pressure line to the Suction line redirects to cause, on the one hand, the pressure the hydraulic fluid is reduced and also due to the return of the hydraulic fluid a continuous Run of the gear pump can take place.
- GB 2 295 422 describes a fuel pump for fuel injection an internal combustion engine in which a pressure relief valve is integrated, however this is Pressure relief valve in a fixed part of the pump built-in, d. H. the pump housing is strongly on adapted to the installation of the valve. This is disadvantageous if Pumps can be built with or without a valve, because designed two completely different pump housings and have to be manufactured.
- a hydraulic pump is known from US Pat. No. 4,828,462, which also has a pressure relief valve, but that not located in the immediate vicinity of the drive gears is, so that the space required for this is high.
- a gear pump with included Relief valve known, with a bypass channel between the Pressure space and the suction space is created that a bearing body for the pinion shafts axially movable in pump housing is arranged and opposite the end wall of the Gear pump is loaded by an adjustable spring.
- this is only with a relatively high level of design effort and a special adaptation of the pump housing to enable this purpose. Therefore, it is necessary to create a special housing for this, and if above Pump units are also manufactured without a pressure relief valve should be, especially for applications in which a Pressure relief valve is not necessary and a special one inexpensive technical solution is required, it is necessary two or more different housings for each Design and provide use cases. This is in Considerable in terms of manufacturing and storage costs and therefore unfavorable.
- the pressure relief valve works in axial direction of the shafts of the gear wheels.
- FR-A-2 393 956 is a hydraulic gear pump known that u. a. a pressure relief valve in a bearing body the gears describes the one depending on the condition Bypass channel between the pressure and suction area of the Gear pump enables or blocks.
- This hydraulic Gear pump acts on the pressure relief valve
- Bearing bodies of the gears are not directly used as sealing elements for the hydraulic fluid and therefore are additional sealing devices necessary, reducing the manufacturing costs a corresponding pump.
- the direction of movement of the sealing body of the pressure relief valve axially formed to the gear axis and thereby the bearing body becomes very wide, so that this solution is due their size is disadvantageous wherever there is one in a confined space hydraulic gear pump is to be installed, e.g. B. in door actuators.
- the invention has for its object a pump device to create especially for door operating devices, which have a pressure relief valve and which regarding of the pump devices that do not have a pressure relief valve exhibit minimal design changes.
- a door operating device 1 is a detail of a door operating device 1, which essentially consists of a Electric motor 2 and an associated hydraulic Gear pump 3 exists. Connect to gear pump 3 other devices for door operation, such as a cylinder provided with a piston and a of which operated door toggle lever, which in turn with the one to be operated Door is connected, these latter facilities however, not shown for reasons of clarity are.
- the electric motor 2 receives its electrical via a cable 4 Tension; via a motor shaft 5 and a coupling piece 6 the motor 2 connected to the gear pump 3, the Coupling 6 engages in a pump shaft 7.
- the gear pump 3 consists essentially of a housing 8, in which two intermeshing gears are arranged are, only one gear 9 can be seen in FIG. 1.
- On the sides of the gears 9 are delimited by bearing bodies 10 and 11, which receive the shafts 12 and 14 of the gear wheels 9.
- These bearing bodies 10, 11 are essentially eight-shaped or glasses-like shape, as can be seen from FIGS. 2 and 3 is and have a sealing and storage function.
- the gear pump 3 has a suction channel 15 for the hydraulic fluid on the gear pump 3 again flows in and a pressure line 16, in which the under pressure conveyed liquid medium is removed.
- the flow direction of the hydraulic medium is illustrated by arrows in Fig. 1.
- the electric motor 2 runs when the door operating device is in operation 1 always with the same power and moves over the motor shaft 5, the clutch 6 and the pump shaft 7, the gears 9, so that the hydraulic fluid through the pressure line 16th convey out of the pump area. If need hydraulic fluid is not high, for example if the Door is almost completely open and is switched so that it turns only moving slowly, becomes more hydraulic fluid promoted as the door operating device 1 needed and the Liquid pressure rises.
- a pressure relief valve is used 17 proposed that in this embodiment in a bearing body 11 is provided.
- the pressure relief valve consists essentially of a ball 18, which has a Spring 19 is loaded.
- a ball 18 can also other sealing element can be used, e.g. B. a cone or the like.
- the valve 17 is between the pressure side and the suction side the gear pump 3 arranged and connects them Pumps when needed.
- the setting of the pressure relief valve 17 is in this Embodiment possible and takes place via a screw 21, which is provided on its outside with a thread 22, the combs with a thread of the screw seat 23.
- the Screw 21 presses the spring 19, and another Screwing in the screw 21 places a greater load on the ball 18, so that the pressure relief valve 17 only at one opens higher pressure; of course, in reverse
- the pressure relief valve 17 is also set in this way be that there is already a lower pressure in the Pressure line 16 opens.
- the pressure relief valve 17 proposed here can also be trained in a different way, such. B. can instead another chosen ball / spring connection Device be present, which is elastic and if the pressure in the pressure channel 16 is too high, the bypass channel 20 releases.
- the setting of the valve can also be set to other way.
- Pressure relief valve 17 is only preset in the gear pump 3 to integrate, as can be seen from Fig. 3.
- the pressure relief valve 17 can not have a Screw are regulated, but the setting of the Pressure relief valve 17 is preset at the factory, to save costs.
- the ball 18 and the spring 19 were only used in the gear pump 3. By means of a mother 14, the pressure relief valve 17 is fixed.
- pressure relief valve 17 it is also possible to separate the pressure relief valve 17 to control, e.g. B. over compressed air, or an externally controlled Use solenoid valve. This is beneficial to z. B. to open the valve when starting the pump to by Lowering the fluid pressure a lighter Allow the pump to start.
- the bearing body 10 or 11 with an integrated pressure relief valve equip, d. H. as a fully integrated Unit so that the pump housing does not change at all must now if a gear pump 3 with a pressure relief valve should be equipped, because with this Embodiment on a bore of the pump housing for a spring 19 according to FIGS. 1 to 3 can be dispensed with.
- the integration of the pressure relief valve 17 in the bearing body or "glasses" also has the advantage that when opening of the bypass channel created by the valve is extremely short. This is advantageous because when opening the valve a particularly quick Pressure equalization is brought about, so that, for. B. damage is avoided as quickly as possible due to overpressure.
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)
- Details Of Reciprocating Pumps (AREA)
- Power-Operated Mechanisms For Wings (AREA)
- Fluid-Pressure Circuits (AREA)
Description
- Fig. 1
- in einer Seitenansicht einen Elektromotor mit daran angeordneter hydraulischer Zahnradpumpe zeigt,
- Fig. 2
- zeigt einen Querschnitt durch die Zahnradpumpe und
- Fig. 3
- zeigt ein weiteres Ausführungsbeispiel einer hydraulischen Zahnradpumpe.
Claims (5)
- Hydraulische Zahnradpumpe, insbesondere für eine Türbetätigungsvorrichtung mit einem Gehäuse, worin außenverzahnte Zahnräder angeordnet sind, die miteinander in Eingriff stehen, wobei die Zahnräder von mindestens einem Lagerkörper gehalten sind, der von dem Gehäuse entnehmbar ist, wobei zumindest ein Zahnrad mit einem Antrieb versehen ist sowie mit einer Druckleitung für die zu fördernde hydraulische Flüssigkeit und einer Saugleitung für die angesaugte hydraulische Flüssigkeit, wobei zwischen dem Druck- und Saugbereich der Pumpe ein Bypasskanal besteht, der über ein Druckbegrenzungsventil geöffnet wird, wobei das Druckbegrenzungsventil (17) in einem Lagerkörper (11) angeordnet ist, dessen Außenwandung abdichtend in dem Gehäuse (8) angeordnet ist, dadurch gekennzeichnet, daß die Bewegungsgerade des Dichtungselementes des Druckbegrenzungsventiles (17) senkrecht zur Rotationsachse der Zahnräder angeordnet ist.
- Zahnradpumpe gemäß Anspruch 1, gekennzeichnet durch ein federbelastetes Dichtungselement des Druckbegrenzungsventiles (17), dessen Feder (19) in ihrer Spannung einstellbar ist.
- Zahnradpumpe gemäß einem der vorhergehenden Ansprüche, gekennzeichnet durch ein fremdsteuerbares Druckbegrenzungsventil (17).
- Zahnradpumpe gemäß einem der vorhergehenden Ansprüche, gekennzeichnet durch den das Druckbegrenzungsventil (17) aufweisenden Lagerkörper (11), der bis auf Aussparungen für den Bypasskanal (20) sowie für die Druckleitung (16) und die Saugleitung (15) mit seiner Außenseite abdichtend in dem Gehäuse (8) angeordnet ist.
- Zahnradpumpe gemäß einem der vorhergehenden Ansprüche, gekennzeichnet durch eine achtförmige Ausbildung des Lagerkörpers (11).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19631202A DE19631202A1 (de) | 1996-08-02 | 1996-08-02 | Hydraulische Zahnradpumpe, insbesondere für eine Türbetätigungsvorrichtung |
DE19631202 | 1996-08-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0822334A2 EP0822334A2 (de) | 1998-02-04 |
EP0822334A3 EP0822334A3 (de) | 1998-11-25 |
EP0822334B1 true EP0822334B1 (de) | 2003-09-17 |
Family
ID=7801575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97112978A Expired - Lifetime EP0822334B1 (de) | 1996-08-02 | 1997-07-29 | Zahnradpumpe |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0822334B1 (de) |
DE (3) | DE19631202A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19933864C2 (de) * | 1999-07-23 | 2003-05-28 | Neudecker & Jolitz Gmbh & Co | Türöffner |
CN111119637A (zh) * | 2019-12-23 | 2020-05-08 | 北京电子工程总体研究所 | 气动式舱体门盖开启机构 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2758548A (en) * | 1950-08-24 | 1956-08-14 | Edward A Rockwell | Rotary fluid displacement device and mechanism therefor |
US3671143A (en) * | 1970-11-05 | 1972-06-20 | Trw Inc | Flat side valve for pressure balanced power steering pump with improved aspirator action |
FR2393956A2 (fr) * | 1977-06-07 | 1979-01-05 | Hydro Meca | Pompe hydraulique pour l'alimentation d'un dispositif de commande |
DE3225549A1 (de) * | 1982-07-08 | 1984-01-12 | Robert Bosch Gmbh, 7000 Stuttgart | Pumpe, insbesondere zum foerdern von kraftstoff fuer brennkraftmaschinen |
DE3320596A1 (de) * | 1983-06-08 | 1984-01-05 | Neudecker & Jolitz GmbH & Co KG, 4423 Gescher | Motorpumpenkompakteinheit bestehend aus elektromotor und aussenverzahnter zahnradpumpe kompl. in einem gehaeuse |
DD221798A1 (de) * | 1984-03-12 | 1985-05-02 | Schwermasch Liebknecht Veb K | Zahnradpumpe mit einbezogenem ueberdruckventil |
US4902202A (en) * | 1987-07-29 | 1990-02-20 | Hydreco, Inc. | Variable discharge gear pump with energy recovery |
US4828462A (en) * | 1987-12-10 | 1989-05-09 | Dana Corporation | Pressure detecting system for a hydraulic device |
US5397219A (en) * | 1993-06-21 | 1995-03-14 | C. Cretors & Company | Integral liquid pump and drainback valve |
DE4441505A1 (de) * | 1994-11-22 | 1996-05-23 | Bosch Gmbh Robert | Kraftstoff-Förderpumpe für eine Kraftstoffeinspritzpumpe für Brennkraftmaschinen |
DE4444819A1 (de) * | 1994-12-15 | 1996-06-20 | Bayerische Motoren Werke Ag | Schmierölpumpe einer Brennkraftmaschine |
-
1996
- 1996-08-02 DE DE19631202A patent/DE19631202A1/de not_active Ceased
-
1997
- 1997-07-29 DE DE59710749T patent/DE59710749D1/de not_active Expired - Fee Related
- 1997-07-29 EP EP97112978A patent/EP0822334B1/de not_active Expired - Lifetime
- 1997-07-31 DE DE29713614U patent/DE29713614U1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE19631202A1 (de) | 1998-02-05 |
DE29713614U1 (de) | 1997-10-30 |
DE59710749D1 (de) | 2003-10-23 |
EP0822334A2 (de) | 1998-02-04 |
EP0822334A3 (de) | 1998-11-25 |
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