EP0334040A1 - Gear machine (pump or motor) - Google Patents
Gear machine (pump or motor) Download PDFInfo
- Publication number
- EP0334040A1 EP0334040A1 EP19890103043 EP89103043A EP0334040A1 EP 0334040 A1 EP0334040 A1 EP 0334040A1 EP 19890103043 EP19890103043 EP 19890103043 EP 89103043 A EP89103043 A EP 89103043A EP 0334040 A1 EP0334040 A1 EP 0334040A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear
- teeth
- pump
- motor
- gear wheel
- 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
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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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/20—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with dissimilar tooth forms
Definitions
- the invention relates to a gear machine according to the preamble of the main claim.
- gear machines with the same number of teeth of the meshing gears, the torque arises alternately on the two gears due to the fluid pressure.
- the distribution of the torque on the gears can be read directly from the line of engagement. While the torque of the driving gearwheel acts directly on its shaft, the torque of the driven gearwheel must first be converted to the driving gearwheel via the toothing, with mechanical losses inevitably occurring.
- the gear machine according to the invention with the characterizing features of the main claim has the advantage that the hydraulic torque is divided between the two gears in such a way that the greatest possible proportion is generated directly on the driving gear. This improves the hydraulic-mechanical efficiency.
- the gear machine has a driving gear 10 and a driven gear 11 in a known manner.
- the driven gear 11 has two teeth more than the driving gear 10.
- the pitch point W shifts from the center, and the engagement on the driven gear 11 moves in the direction of the tip circle, the torque of which is reduced , and on the driving wheel 10 in the direction of the root circle F, whereby its torque becomes larger. Thanks to the more direct flow of the throughput, the hydraulic-mechanical efficiency is improved.
- the driving gear 10 is corrected for plus, the driven gear 11 for minus for this purpose.
- the gears remain gearable even with different numbers of teeth.
- the requirement for an identical tip diameter for both wheels limits the geometrical possibilities of involute teeth. Teeth on the grinding wheel and undercut tendency on the driven wheel form the limits.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Hydraulic Motors (AREA)
- Gears, Cams (AREA)
Abstract
Description
Die Erfindung geht aus von einer Zahnradmaschine nach der Gattung des Hauptanspruchs. Bei bekannten Zahnradmaschinen mit gleicher Zähnezahl der kämmenden Zahnräder entsteht das Drehmoment infolge des Flüssigkeitsdrucks wechselweise an den beiden Zahnrädern. Dieses ist für das jeweilige Zahnrad um so höher, je weiter der abdichtende Eingriff von seinem Kopfkreis entfernt ist. Die Aufteilung des Drehmoments auf die Zahnräder kann so direkt aus der Eingriffslinie abgelesen werden. Während das Drehmoment des treibenden Zahnrads direkt an seiner Welle wirksam wird, muß das Drehmoment des getriebenen Zahnrads erst noch über die Verzahnung auf das treibende Zahnrad umgesetzt werden, wobei zwangsläufig mechanische Verluste entstehen.The invention relates to a gear machine according to the preamble of the main claim. In known gear machines with the same number of teeth of the meshing gears, the torque arises alternately on the two gears due to the fluid pressure. The higher the sealing engagement is from its tip circle, the higher for the respective gear. The distribution of the torque on the gears can be read directly from the line of engagement. While the torque of the driving gearwheel acts directly on its shaft, the torque of the driven gearwheel must first be converted to the driving gearwheel via the toothing, with mechanical losses inevitably occurring.
Die erfindungsgemäße Zahnradmaschine mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß das hydraulische Moment so auf die beiden Zahnräder aufgeteilt wird, daß ein möglichst hoher Anteil direkt am treibenden Zahnrad entsteht. Dadurch wird der hydraulisch-mechanische Wirkungsgrad verbessert.The gear machine according to the invention with the characterizing features of the main claim has the advantage that the hydraulic torque is divided between the two gears in such a way that the greatest possible proportion is generated directly on the driving gear. This improves the hydraulic-mechanical efficiency.
Dies gilt insbesondere für Betriebszustände, in denen mechanische Verluste vorherrschen, beispielsweise für den Anlaufvorgang von Zahnradmotoren.This applies in particular to operating states in which mechanical losses predominate, for example for the starting process of gear motors.
Ein Ausführungsbeispiel der Erfindung ist in schematischer Darstellung in der Zeichnung wiedergegeben.An embodiment of the invention is shown in a schematic representation in the drawing.
Die Zahnradmaschine weist in bekannter Weise ein treibendes Zahnrad 10 und ein getriebenes Zahnrad 11 auf. Trotz unverändertem Achsabstand und gleichem Kopfkreisdurchmesser K hat das getriebene Zahnrad 11 zwei Zähne mehr als das treibende Zahnrad 10. Durch diesen Unterschied verschiebt sich der Wälzpunkt W aus der Mitte, und der Eingriff am getriebenen Zahnrad 11 wandert in Richtung Kopfkreis, wobei dessen Drehmoment kleiner wird, und am treibenden Rad 10 in Richtung Fußkreis F, wodurch dessen Drehmoment größer wird. Dank dem direkteren Fluß der durchgesetzten Leistung erhält man einen verbesserten hydraulisch-mechanischen Wirkungsgrad.The gear machine has a
Bei Evolventenverzahnungen wird zu diesem Zweck das treibende Zahnrad 10 nach plus, das getriebene Zahnrad 11 nach minus korrigiert. Dabei bleiben die Zahnräder auch bei unterschiedlicher Zähnezahl abwälzfähig. Durch die Forderung nach identischem Kopfkreisdurchmesser beider Räder sind die geometrischen Möglichkeiten der Evolventenverzahnung beschränkt. Spitz werdende Zähne am teibenden Rad und Unterschnittneigung am getriebenen Rad bilden die Grenzen.For involute gears, the
Besonders vorteilhaft ist die Kombination mit der Verwendung einer geeigneten, nichtevolventischen Verzahnung. Man erhält dadurch mehr Möglichkeiten für die Gestaltung der Zahnform. Zweckmäßig ist bei spielsweise als Eingriffslinie die Kombination zweier logarithmischer Spiralen um die Radmittelpunkte. Mit einer solchen Verzahnung lassen sich Zähnezahldifferenzen von mindestens zwei bei üblichem Kopfkreisdurchmesser darstellen.The combination with the use of a suitable, non-volatile toothing is particularly advantageous. This gives you more options for the design of the tooth shape. It is useful for for example, as a line of engagement, the combination of two logarithmic spirals around the wheel centers. With such a toothing, differences in the number of teeth of at least two with the usual tip diameter can be represented.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3809721 | 1988-03-23 | ||
DE3809721A DE3809721C1 (en) | 1988-03-23 | 1988-03-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0334040A1 true EP0334040A1 (en) | 1989-09-27 |
EP0334040B1 EP0334040B1 (en) | 1992-08-26 |
Family
ID=6350448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89103043A Expired - Lifetime EP0334040B1 (en) | 1988-03-23 | 1989-02-22 | Gear machine (pump or motor) |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0334040B1 (en) |
DE (2) | DE3809721C1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2211893B (en) * | 1987-11-04 | 1992-01-02 | Bosch Gmbh Robert | Hydraulic gear machine (pump or motor) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4242217C2 (en) * | 1992-12-15 | 1995-07-20 | Bosch Gmbh Robert | Gear machine (pump or motor) |
DE4320489C2 (en) * | 1993-06-21 | 2001-06-28 | Bosch Gmbh Robert | Gear machine (pump or motor) |
CN108291537B (en) | 2015-12-04 | 2020-10-09 | 奥迪股份公司 | External gear pump |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH376776A (en) * | 1960-03-14 | 1964-04-15 | Wiggermann Georg | Gear displacement machine |
US3303792A (en) * | 1964-04-20 | 1967-02-14 | Roper Ind Inc | Gear pump with trapping reliefs |
DE2242269B2 (en) * | 1971-08-28 | 1980-06-12 | Shimadzu Seisakusho Ltd., Kyoto (Japan) | Gear pump or motor |
DE3246685A1 (en) * | 1981-12-22 | 1983-06-30 | Sullair Technology AB, 11653 Stockholm | ROTORS FOR A SCREW ROTOR MACHINE |
EP0149446A2 (en) * | 1983-12-14 | 1985-07-24 | Boge Kompressoren Otto Boge GmbH & Co. KG | Rotary piston compressor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2421891A1 (en) * | 1974-05-07 | 1975-11-20 | Bosch Gmbh Robert | GEAR MOTOR |
-
1988
- 1988-03-23 DE DE3809721A patent/DE3809721C1/de not_active Expired
-
1989
- 1989-02-22 DE DE8989103043T patent/DE58902105D1/en not_active Expired - Lifetime
- 1989-02-22 EP EP89103043A patent/EP0334040B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH376776A (en) * | 1960-03-14 | 1964-04-15 | Wiggermann Georg | Gear displacement machine |
US3303792A (en) * | 1964-04-20 | 1967-02-14 | Roper Ind Inc | Gear pump with trapping reliefs |
DE2242269B2 (en) * | 1971-08-28 | 1980-06-12 | Shimadzu Seisakusho Ltd., Kyoto (Japan) | Gear pump or motor |
DE3246685A1 (en) * | 1981-12-22 | 1983-06-30 | Sullair Technology AB, 11653 Stockholm | ROTORS FOR A SCREW ROTOR MACHINE |
EP0149446A2 (en) * | 1983-12-14 | 1985-07-24 | Boge Kompressoren Otto Boge GmbH & Co. KG | Rotary piston compressor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2211893B (en) * | 1987-11-04 | 1992-01-02 | Bosch Gmbh Robert | Hydraulic gear machine (pump or motor) |
Also Published As
Publication number | Publication date |
---|---|
EP0334040B1 (en) | 1992-08-26 |
DE58902105D1 (en) | 1992-10-01 |
DE3809721C1 (en) | 1989-06-01 |
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