EP0233485B1 - Gear motor - Google Patents

Gear motor Download PDF

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Publication number
EP0233485B1
EP0233485B1 EP87100630A EP87100630A EP0233485B1 EP 0233485 B1 EP0233485 B1 EP 0233485B1 EP 87100630 A EP87100630 A EP 87100630A EP 87100630 A EP87100630 A EP 87100630A EP 0233485 B1 EP0233485 B1 EP 0233485B1
Authority
EP
European Patent Office
Prior art keywords
pressure
gear motor
gearwheels
sealing plate
zone
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
Application number
EP87100630A
Other languages
German (de)
French (fr)
Other versions
EP0233485A2 (en
EP0233485A3 (en
Inventor
Siegfried Mayer
Hayno Dipl.-Ing. Rustige
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0233485A2 publication Critical patent/EP0233485A2/en
Publication of EP0233485A3 publication Critical patent/EP0233485A3/en
Application granted granted Critical
Publication of EP0233485B1 publication Critical patent/EP0233485B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F04C14/265—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 being obtained by displacing a lateral sealing face
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the invention relates to a gear motor according to the preamble of the main claim.
  • a gear machine pump or motor
  • the delivery rate of the gear machine can be reduced or even brought to zero if the spaces receiving the seals are relieved to the low-pressure side or to the container by means of a control valve.
  • the purpose of this device is to use a portion of the fluid delivered to lubricate and cool the gear machine.
  • FIG. 1 shows a longitudinal section through a gear motor
  • FIG. 2 shows a section along 11-11 according to FIG. 1
  • FIG. 3 shows a section along 111-111 according to FIG. 1
  • FIG. 4 shows a section along IV-IV according to FIG. 2
  • FIG. 5 shows a modification of the embodiment, in particular according to Figure 4
  • Figure 6 is a schematic diagram.
  • the gear motor has a housing 10 with an interior 11, which is closed on both sides by covers 12, 13. In the housing, two gears 14, 15 mesh with one another in external engagement.
  • the shafts 16, 17 of the gearwheels are mounted in bearing bodies 18, 19 which are approximately glasses-shaped.
  • the shaft 17 has an extension 20 which penetrates through a bore 21 in the cover 13 and is used to deliver the torque generated by the gear motor.
  • a seal 23 is arranged at the passage of the extension 20 in the lid.
  • the external pressure field 26 extends concentrically around the shaft axes around on the high pressure side HD up to the low pressure side ND. It is separated from the internal pressure field 27 by a seal 28, which seal lies in a groove 23 of the bearing body and has approximately the shape of a "3". It extends approximately along the outer edge of the sealing plate 24.
  • a channel 30 extends from the groove 29 and thus the pressure field 27, which leads to an electromagnetically actuated switching valve 31, see FIG. 6, which shows a schematic representation of the pressure fields and the valve.
  • a gap connection 32 leads from the pressure field 27 to the pressure field 26, which is acted upon from the high pressure side of the machine in the usual way. In the exemplary embodiment according to FIG. 4, the gap connection 32 is in play along the outer circumference of the sealing plate 24 to the pressure field 26.
  • the pressure field 26 is applied from the high pressure side HD via gaps along the bearing body. Pressure medium passes through the gap connection 32 from the pressure field 26 to the pressure field 27, so that this is now also acted upon.
  • the switching valve 31 is opened, the pressure in the pressure field 27 is reduced. As a result, the sealing plate 24 stands out from the gears. Since the pressure medium now flows past the gears, the engine speed drops. With the help of the valve 31 and the pulse length modulation, the speed of the hydraulic motor can be controlled.
  • the slightly modified exemplary embodiment according to FIG. 5 uses, in addition to the seal 28, a seal 35 which creates a hermetic seal of the groove 29 with respect to the pressure field 26.
  • the gap connection here consists of one or more throttle bores 36 which lead from the groove 29 to the pressure field 26.
  • the function is again exactly the same as in the previous embodiment.
  • FIG. 2 shows two dot-dash bores 37, 38, which are axially aligned and penetrate into the interior 11 from the outside of the housing 10.
  • the bore 37 forms the low-pressure side bore
  • the bore 38 the high-pressure side bore. From this side, the high-pressure medium also penetrates into the outer pressure field 26 via the gap 40 along the bearing bodies.
  • FIG. 6 shows the process schematically.
  • the gear motor Z is supplied by a pump P, the pressure fields 26, 27 are - as described - in the gear motor Z itself, the switching valve is expediently outside the housing 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Die Erfindung geht aus von einem Zahnradmotor nach der Gattung des Hauptanspruchs. Aus der GB-A 2 048 385 ist eine Zahnradmaschine (Pumpe oder Motor) bekanntgeworden, bei der die Lagerkörper auf einer Seite durch entsprechende Dichtungen bzw. durch ein Druckfeld beim Anlauf in dichtende Berührung mit den Zahnradseitenflächen gebracht werden. Die Fördermenge der Zahnradmaschine kann dadurch verringert oder gar auf Null gebracht werden, wenn die die Dichtungen aufnehmenden Räume mit Hilfe eines Steuerventils zur Niederdruckseite bzw. zum Behälter entlastet werden. Der Zweck dieser Einrichtung besteht darin, einen Teil der geförderten Flüssigkeit zum Schmieren und Kühlen der Zahnradmaschine zu verwenden.The invention relates to a gear motor according to the preamble of the main claim. From GB-A 2 048 385 a gear machine (pump or motor) has become known in which the bearing bodies on one side are brought into sealing contact with the gear side surfaces by appropriate seals or by a pressure field during start-up. The delivery rate of the gear machine can be reduced or even brought to zero if the spaces receiving the seals are relieved to the low-pressure side or to the container by means of a control valve. The purpose of this device is to use a portion of the fluid delivered to lubricate and cool the gear machine.

Es ist die Aufgabe der Erfindung, einen Zahnradmotor nach der Gattung des Hauptanspruchs zu schaffen, mit dem auf einfache Weise eine Drehzahlsteuerung verwirklicht wird, wobei eine Bypass-Steuerung unter Verwendung eines Steuerventils und eines weiteren, ohnedies notwendigen Teils erfolgt.It is the object of the invention to create a gear motor according to the preamble of the main claim, with which a speed control can be implemented in a simple manner, wherein a bypass control is carried out using a control valve and a further part which is anyway necessary.

Besonders vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.Particularly advantageous embodiments of the invention result from the dependent claims.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Längsschnitt durch einen Zahnradmotor, Figur 2 einen Schnitt längs 11-11 nach Figur 1, Figur 3 einen Schnitt längs 111-111 nach Figur 1, Figur 4 einen Schnitt längs IV-IV nach Figur 2, Figur 5 einen Abwandlung des Ausführungsbeispiels, insbesondere nach Figur 4, Figur 6 eine Prinzipskizze.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a longitudinal section through a gear motor, FIG. 2 shows a section along 11-11 according to FIG. 1, FIG. 3 shows a section along 111-111 according to FIG. 1, FIG. 4 shows a section along IV-IV according to FIG. 2, and FIG. 5 shows a modification of the embodiment, in particular according to Figure 4, Figure 6 is a schematic diagram.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der Zahnradmotor weist ein Gehäuse 10 mit einem Innenraum 11 auf, das beidseitig durch Deckel 12, 13 verschlossen ist. Im Gehäuse kämmen zwei Zahnräder 14, 15 im Außeneingriff miteinander. Die Wellen 16, 17 der Zahnräder sind in etwa brillenförmig ausgebildeten Lagerkörpern 18, 19 gelagert. Die Welle 17 hat einen Fortsatz 20, der durch eine Bohrung 21 im Deckel 13 nach außen dringt und zur Abgabe des vom Zahnradmotor erzeugten Drehmoments dient. Am Durchtritt des Fortsatzes 20 im Deckel ist eine Dichtung 23 angeordnet.The gear motor has a housing 10 with an interior 11, which is closed on both sides by covers 12, 13. In the housing, two gears 14, 15 mesh with one another in external engagement. The shafts 16, 17 of the gearwheels are mounted in bearing bodies 18, 19 which are approximately glasses-shaped. The shaft 17 has an extension 20 which penetrates through a bore 21 in the cover 13 and is used to deliver the torque generated by the gear motor. At the passage of the extension 20 in the lid, a seal 23 is arranged.

Zwischen dem Lagerkörper 19 und den Zahnradseitenflächen befindet sich eine Dichtplatte 24, deren Kontur aus Figur 2 ersichtlich ist. Wie weiterhin aus den Figuren 3 und 4 besonders deutlich ersichtlich ist, sind zwischen der Dichtplatte 24 und dem benachbarten Lagerkörper 19 zwei konzentrische Druckfelder vorhanden, nämlich ein außenliegendes Druckfeld 26 und ein radial innenliegendes Druckfeld 27. Das außenliegende Druckfeld 26 erstreckt sich konzentrisch um die Wellenachsen herum auf der Hochdruckseite HD bis weit zur niederdruckseite ND. Es ist durch eine Dichtung 28 vom innenliegenden Druckfeld 27 getrennt, welche Dichtung in einer Nut 23 des Lagerkörpers liegt und etwa die Form einer "3" aufweist. Sie erstreckt sich etwa entlang des Außenrandes der Dichtplatte 24.A sealing plate 24, the contour of which can be seen in FIG. 2, is located between the bearing body 19 and the gearwheel side surfaces. As can also be seen particularly clearly from FIGS. 3 and 4, there are two concentric pressure fields between the sealing plate 24 and the adjacent bearing body 19, namely an external pressure field 26 and a radially internal pressure field 27. The external pressure field 26 extends concentrically around the shaft axes around on the high pressure side HD up to the low pressure side ND. It is separated from the internal pressure field 27 by a seal 28, which seal lies in a groove 23 of the bearing body and has approximately the shape of a "3". It extends approximately along the outer edge of the sealing plate 24.

Von der Nut 29 und damit dem Druckfeld 27 geht ein Kanal 30 aus, der zu einem elektromagnetisch betätigbaren Schaltventil 31 führt, siehe hierzu Figur 6, die eine schematische Darstellung der Druckfelder und des Ventils zeigt. Vom Druckfeld 27 führt eine Spaltverbindung 32 zum Druckfeld 26, das von der Hochdruckseite der Maschine her in üblicher Weise beaufschlagt ist. Im Ausführungsbeispiel nach Figur 4 besteht die Spaltverbindung 32 im Spiel entlang dem Außenumfang der Dichtplatte 24 zum Druckfeld 26.A channel 30 extends from the groove 29 and thus the pressure field 27, which leads to an electromagnetically actuated switching valve 31, see FIG. 6, which shows a schematic representation of the pressure fields and the valve. A gap connection 32 leads from the pressure field 27 to the pressure field 26, which is acted upon from the high pressure side of the machine in the usual way. In the exemplary embodiment according to FIG. 4, the gap connection 32 is in play along the outer circumference of the sealing plate 24 to the pressure field 26.

Das Druckfeld 26 ist von der Hochdruckseite HD her beaufschalgt über Spalte entlang dem Lagerkörper. Druckmittel gelangt über die Spaltverbindung 32 vom Druckfeld 26 zum Druckfeld 27, so daß dieses nun auch beaufschlagt ist. Wenn das Schaltventil 31 geöffnet wird, wird der Druck im Druckfeld 27 abgebaut. Dadurch hebt sich die Dichtplatte 24 von den Zahnrädern ab. Da nun das Druckmittel teilweise neben den Zahnrädern vorbeiströmt, sinkt die Drehzahl des Motors ab. Mit Hilfe des Ventils 31 und der Pulslängenmodulation kann also die Drehzahl des Hydromotors gesteuert werden.The pressure field 26 is applied from the high pressure side HD via gaps along the bearing body. Pressure medium passes through the gap connection 32 from the pressure field 26 to the pressure field 27, so that this is now also acted upon. When the switching valve 31 is opened, the pressure in the pressure field 27 is reduced. As a result, the sealing plate 24 stands out from the gears. Since the pressure medium now flows past the gears, the engine speed drops. With the help of the valve 31 and the pulse length modulation, the speed of the hydraulic motor can be controlled.

Das geringfügig abgewandelte Ausführungsbeispiel nach Figur 5 verwendet zusätzlich zur Dichtung 28 eine Dichtung 35,welche eine hermetische Abdichtung der Nut 29 gegenüber dem Druckfeld 26 herstellt. Die Spaltverbindung besteht hier aus einer oder mehreren Drosselbohrungen 36, die von der Nut 29 zum Druckfeld 26 führen. Die Funktion ist wieder genau dieselbe wie beim vorherigen Ausführungsbeispiel.The slightly modified exemplary embodiment according to FIG. 5 uses, in addition to the seal 28, a seal 35 which creates a hermetic seal of the groove 29 with respect to the pressure field 26. The gap connection here consists of one or more throttle bores 36 which lead from the groove 29 to the pressure field 26. The function is again exactly the same as in the previous embodiment.

Die Figur 2 zeigt zwei strichpunktierte Bohrungen 37, 38, die achsgleich verlaufen und von der Außenseite des Gehäuses 10 her in den Innenraum 11 eindringen. Die Bohrung 37 bildet die niederdruckseitige Bohrung, die Bohrung 38 die hochdruckseitige Bohrung. Von dieser Seite her dringt auch das unter Hochdruck stehende Druckmittel über den Spalt 40 entlang der Lagerkörpern zuerst in das äußere Druckfeld 26 ein.FIG. 2 shows two dot-dash bores 37, 38, which are axially aligned and penetrate into the interior 11 from the outside of the housing 10. The bore 37 forms the low-pressure side bore, the bore 38 the high-pressure side bore. From this side, the high-pressure medium also penetrates into the outer pressure field 26 via the gap 40 along the bearing bodies.

Die Figur 6 zeigt den Vorgang schematisch. Der Zahnradmotor Z wird von einer Pumpe P versorgt, die Druckfelder 26, 27 liegen - wie beschrieben - im Zahnradmotor Z selbst, das Schaltventil liegt zweckmäßigerweise außerhalb des Gehäuses 10.Figure 6 shows the process schematically. The gear motor Z is supplied by a pump P, the pressure fields 26, 27 are - as described - in the gear motor Z itself, the switching valve is expediently outside the housing 10.

Es ist natürlich möglich, die Zahnradwellen direkt in den Deckeln zu lagern. Die Dichtplatte 24 liegt dann zwischen den Zahnradseitenflächen und dem Deckel.It is of course possible to store the gear shaft directly in the cover. The sealing plate 24 then lies between the gear side surfaces and the cover.

Claims (3)

1. Gear motor with two gearwheels which mesh in external engagement with one another and which are preferably mounted in approximately spectacle- shaped bearing bodies, and with at least one sealing plate (24) which is arranged between the gearwheels and the adjacent bearing bodies or covers of the housing and which is pressed sealingly against the gearwheel side faces by fluid pressure, characterized in that there act on the sealing plate (24) constantly an approximately arcuate first pressure zone (26) located on the high-pressure side and intermittently a second pressure zone (27) which is arranged radially within the first zone and which, for the purpose of controlling the speed of the machine, can be loaded or relieved by means of an electromagnetically actuable switch valve (31) timed by pulse-length modulation.
2. Gear motor according to claim 1, characterized in that sealing plates are arranged on both sides of the gearwheels.
3. Gear motor according to claim 1 or 2, characterized in that the pressure zones (26, 37 [sic]) are connected to one another by means of a throttling connection (32, 36), and the second pressure zone can be relieved towards the tank via the switch valve (31).
EP87100630A 1986-02-19 1987-01-19 Gear motor Expired - Lifetime EP0233485B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3605176 1986-02-19
DE19863605176 DE3605176A1 (en) 1986-02-19 1986-02-19 GEAR MOTOR

Publications (3)

Publication Number Publication Date
EP0233485A2 EP0233485A2 (en) 1987-08-26
EP0233485A3 EP0233485A3 (en) 1988-09-14
EP0233485B1 true EP0233485B1 (en) 1990-06-13

Family

ID=6294391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100630A Expired - Lifetime EP0233485B1 (en) 1986-02-19 1987-01-19 Gear motor

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EP (1) EP0233485B1 (en)
DE (2) DE3605176A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923518A1 (en) * 1989-07-15 1991-01-17 Bosch Gmbh Robert Gear pump with externally meshing gears - incorporates control pipe for load sensing pressure
DE3931186C2 (en) * 1989-09-19 1999-12-16 Bosch Gmbh Robert Gear motor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3175468A (en) * 1962-04-05 1965-03-30 Cessna Aircraft Co Fluid motor with delayed pressure loading
DE2349304C3 (en) * 1973-10-01 1981-07-16 Robert Bosch Gmbh, 7000 Stuttgart Gear motor operated with hydraulic fluid
DD142741A1 (en) * 1979-04-09 1980-07-09 Hubert Stroehl DEVICE FOR CONTROLLING THE FLUID CURRENT OF ROTATION PISTON MACHINES, IN PARTICULAR GEAR PUMPS

Also Published As

Publication number Publication date
DE3763224D1 (en) 1990-07-19
EP0233485A2 (en) 1987-08-26
DE3605176A1 (en) 1987-08-20
EP0233485A3 (en) 1988-09-14

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