EP0258797A2 - Zahnradpumpe mit veränderlichen Auslassvolumen - Google Patents

Zahnradpumpe mit veränderlichen Auslassvolumen Download PDF

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Publication number
EP0258797A2
EP0258797A2 EP87112353A EP87112353A EP0258797A2 EP 0258797 A2 EP0258797 A2 EP 0258797A2 EP 87112353 A EP87112353 A EP 87112353A EP 87112353 A EP87112353 A EP 87112353A EP 0258797 A2 EP0258797 A2 EP 0258797A2
Authority
EP
European Patent Office
Prior art keywords
pump
discharge
pump housing
rotor
suction port
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.)
Withdrawn
Application number
EP87112353A
Other languages
English (en)
French (fr)
Other versions
EP0258797A3 (de
Inventor
Yasuyoshi Itami Works Saegusa
Mamoru Itami Works Sugimoto
Kikuo Itami Works Hashimoto
Mutsuo Itami Works Terada
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0258797A2 publication Critical patent/EP0258797A2/de
Publication of EP0258797A3 publication Critical patent/EP0258797A3/de
Withdrawn legal-status Critical Current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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04C14/10—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C14/14—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using rotating valves
    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes

Definitions

  • the present invention relates to a variable discharge gear pump equipped with internal gears. It is suited for use as a pump which is required to have a variable suction/discharge capacity to save power, such as for use with an automatic transmission.
  • a vane pump which is a typical variable discharge pump has problems that the number of parts is so great that it is costly, and that it requires much power and the volume efficiency is low during operation at a low speed.
  • An object of the present invention is to provide an improved variable discharge gear pump made by modifying a gear pump which is well-known for its simple construction, in particular a trocoid-toothed internal gear pump which requires less power and exhibits excellent volumetric efficiency during operation at a low speed.
  • a known internal gear pump is a fixed discharge pump in which the relative position between a gear set consisting of an inner rotor and an outer rotor and the suction and discharge ports is fixed. Its suction capacity and operating power increase with the increase in revolution speed.
  • an excess liquid has to be returned to a tank by means of an unloading circuit including a relief valve or the like. Even if the supply of liquid is reduced, the power for the pump remains unchanged. Therefore, when the variable discharge rate is achieved without unloading the sucked liquid, the pump will be forced to work wastefully, thus wasting the driving energy from the power source.
  • a variable discharge gear pump comprising: a pump housing; an internal gear set mounted in the pump housing and having an outer rotor and an inner rotor having one less teeth than the teeth of the outer rotor and in engagement with each other with some amount of eccentricity; the pump housing being formed with a suction port and a discharge port sealed from each other; position changing means for changing the relative position between the gear set and the suction port and the discharge port; and actuating means for turning the position changing means within a predetermined range of angle.
  • ⁇ is a variable determined by the shape of teeth of the rotor, the angle of rotation ⁇ and the distance H in Fig. 9.
  • the suction capacity V (equal to the discharge capacity) can be varied by controlling the angle ⁇ .
  • the internal gear pump in accordance with the present invention is provided with an eccentric ring for changing the track of the outer rotor, a disk formed with the openings communicating with the suction and discharge ports or a sealing piece for displacing the tail end of the suction port.
  • the eccentric ring, the disk or the sealing piece are turned or displaced to change the relative position between the gear set and the suction and discharge ports, thereby changing the suction capacity.
  • Variable discharge vane pumps for general use has its disadvantage that the number of parts is so great that it is costly and complicated in mechanism.
  • the pump according to the present invention is an internal gear pump, it is simple in construction, inexpensive and reliable, and will be advantageously used as a pump to be mounted on an automobile which has to be less fuel consumptive and reliable.
  • Figs. 1 to 3 show the first embodiment of the pump according to the present invention in which the relative position between a gear set and suction and discharge ports are changed by means of an eccentric ring.
  • numeral 1 designates a pump housing which comprises a housing body 1a and a cover plate 1b and in which are mounted an eccentric ring 2, an outer rotor 3 and an inner rotor 4.
  • Numeral 5 indicates a drive shaft for the inner rotor 4.
  • the housing body 1a is formed with a suction port 6 and a disharge port 7 as shown in Figs. 1 and 3.
  • the outer rotor 3 is in engagement with the inner rotor 4 having one less teeth than the former in an eccentric relation so that the centers of two rotors will be spaced from each other by a certain distance (e.g. by a distance ''e'' shown in Fig. 2).
  • the eccentric ring 2 has its inner periphery concentric with the outer rotor 3 and the diameter at its inner periphery is substantially the same as the outer diameter of the outer rotor 3, whereas its outer periphery is concentric with the inner rotor 4 and has substantially the same diameter as the diameter at the inner periphery of the housing body 1a which is concentric with the outer rotor 3.
  • the eccentric ring 2 is adapted to rotate around an axis concentric with the inner rotor 4.
  • the eccentric ring 2 may be provided on its end face with a boss concentric with the inner rotor 4, the boss being received in a recess formed in the housing body 1a to rotatably hold the eccentric ring concentrically with the inner rotor 4.
  • the outer periphery of the eccentric ring 2 and the inner periphery of the housing body 1a do not necessarily have to be concentric with the inner rotor 4. But the pump can be easily manufactured if the eccentric ring 2 is held rotatably and concentrically with respect to the inner rotor 4 as in this embodiment.
  • Figs. 4 and 5 show examples of mechanisms for turning the eccentric ring 2 within a predetermined angle range.
  • Fig. 4 shows a driving mechanism adopted for the pump shown in Fig. 1, which comprises an input lever 8 fixed to the eccentric ring 2 and having its one end protruding out of the housing through a circumferentially extending slit 9 formed in the cover plate 1b.
  • FIG. 5 Another mechanism shown in Fig. 5 comprises a circumferentially extending slit 10 formed in the housing body 1a and a key way 11 formed in the eccentric ring 2 so as to communicate with the slit 10.
  • a rack 12 having its projection engaged in the key way 11 moves linearly back and forth to turn the eccentric ring 2.
  • Other types of driving mechanisms may be used such as one provided with coacting magnets which can rotate the ring 2 without the necessity of boring a hole in the housing.
  • Figs. 6 and 7 show the second embodiment of the pump in which a disk is provided.
  • the pump is provided with a disk 13 between the housing body 1a and the end face of the internal gear set comprising an outer rotor 3 and an inner rotor 4.
  • the disk 13 is formed with openings 6 ⁇ and 7 ⁇ which communicate with the suction ports 6 and discharge port 7, respectively. Except that the disk 13 is arranged concentrically with the inner rotor or the outer rotor (in Figs. 6 and 7, cencentrically with the inner rotor 4) in place of the eccentric ring, this embodiment is substantially the same as the first embodiment.
  • the disc 13 is turned by means of either of the above-described driving mechanisms (in the drawings, the one comprising the input lever 8 and the slit 10 is shown) to change the positions of the openings 6 ⁇ and 7 ⁇ with respect to the gear set held in a fixed position.
  • the suction capacity varies on the same principle as described above.
  • Figs. 12 and 13 show the third embodiment in which sealing pieces are employed.
  • the housing body 1a is formed at two places facing the end face of the gear set with sealing surfaces for the pumping chambers.
  • One of the sealing surfaces is formed between the tail end 6a of the suction port and the front end 7a of the discharge port to provide the maximum volume for the pumping chamber.
  • the other sealing surface is formed between the front end 6b of the suction port and the tail end 7b of the discharge port to provide the minimum volume for the pumping chamber.
  • the sealing surface for the pumping chamber at the maximum volume is formed with an arcuate groove 14 having substantially the same depth as that of the suction port 6 and the discharge port 7 and having a uniform radial width so as to extend from the tail end 6a of the suction port 6 to the front end 7a of the discharge port 7.
  • a seal piece 15 having its both sides and bottom side sliding on the surface of the groove 14 and having the other surface in contact with the end face of the gear set to seal the opening of the pumping chamber.
  • a circumferential slit 10 is formed in the housing body 1a and an input lever 8 is provided on the seal piece 15 so as to have its one end protruding through the slit 10.
  • the input lever 8 can be operated to slide the piece 15 circumferentially through an angle within the range of the space between the slit 10 and the lever 8 so as to displace the tail end 6a of the suction port 6. From the fact that the position of the gear set remains unchanged during this displacement, it follows that each pumping chamber is closed up before it reaches the maximum volume point, thus reducing the suction capacity.
  • sealing piece 15 is provided at the front end side of the suction port to displace the tail end of the discharge port, a given quantity of liquid which increases with the extent of the displacement will be left undischarged in each pumping chamber, reducing the discharge rate. Although one sealing piece 15 provided at either of the two sealing portions would be sufficient to obtain a satisfactory result, if two sealing pieces 15 are provided at both of the sealing portions, a pump with a wider volume variation than the first and second embodiments can be manufactured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP87112353A 1986-08-27 1987-08-25 Zahnradpumpe mit veränderlichen Auslassvolumen Withdrawn EP0258797A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP202487/86 1986-08-27
JP20248786 1986-08-27
JP117560/87 1987-05-13
JP62117560A JPH01104991A (ja) 1986-08-27 1987-05-13 可変容量歯車ポンプ

Publications (2)

Publication Number Publication Date
EP0258797A2 true EP0258797A2 (de) 1988-03-09
EP0258797A3 EP0258797A3 (de) 1988-10-05

Family

ID=26455654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112353A Withdrawn EP0258797A3 (de) 1986-08-27 1987-08-25 Zahnradpumpe mit veränderlichen Auslassvolumen

Country Status (3)

Country Link
EP (1) EP0258797A3 (de)
JP (1) JPH01104991A (de)
KR (1) KR880003112A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4231690A1 (de) * 1992-09-22 1994-03-24 Walter Schopf Innenzahnradpumpe mit variierbarer Förderleistung
EP0846861A1 (de) * 1996-12-04 1998-06-10 Siegfried A. Dipl.-Ing. Eisenmann Stufenlos verstellbare Zahnringpumpe
US6126420A (en) * 1996-12-04 2000-10-03 Eisenmann; Siegfried Infinitely variable ring gear pump
DE10207350C2 (de) * 2001-02-23 2003-05-15 Joma Hydromechanic Gmbh Volumenstromvariable Rotorpumpe
WO2004057191A1 (de) * 2002-12-19 2004-07-08 Joma-Hydromechanic Gmbh Volumenstromvariable innenzahnradpumpe
FR2865507A1 (fr) * 2004-01-27 2005-07-29 Renault Sas Pompe rotative trochoide a debit variable
CN100390416C (zh) * 2002-12-19 2008-05-28 乔马-流体机械有限公司 体积流量可变的转子泵
CN104776017A (zh) * 2014-01-10 2015-07-15 沃尔沃汽车公司 用于液压装置的控制环
US10167866B2 (en) 2014-01-10 2019-01-01 Volvo Car Corporation Displacement pump and a control ring for a displacement pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026809A (en) * 1956-04-06 1962-03-27 Borg Warner Internal-external gear pump
GB896393A (en) * 1959-08-14 1962-05-16 Robert Wesley Brundage Variable volume internal chamber type hydraulic pump
GB1426223A (en) * 1973-05-15 1976-02-25 Concentric Pumps Ltd Rotary positive-idsplacement pumps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026809A (en) * 1956-04-06 1962-03-27 Borg Warner Internal-external gear pump
GB896393A (en) * 1959-08-14 1962-05-16 Robert Wesley Brundage Variable volume internal chamber type hydraulic pump
GB1426223A (en) * 1973-05-15 1976-02-25 Concentric Pumps Ltd Rotary positive-idsplacement pumps

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4231690A1 (de) * 1992-09-22 1994-03-24 Walter Schopf Innenzahnradpumpe mit variierbarer Förderleistung
EP0846861A1 (de) * 1996-12-04 1998-06-10 Siegfried A. Dipl.-Ing. Eisenmann Stufenlos verstellbare Zahnringpumpe
US6126420A (en) * 1996-12-04 2000-10-03 Eisenmann; Siegfried Infinitely variable ring gear pump
CN1114041C (zh) * 1996-12-04 2003-07-09 西格弗里德·A·艾泽曼 可无限变化的环形齿轮泵
DE10207350C5 (de) * 2001-02-23 2006-11-30 Joma-Hydromechanic Gmbh Volumenstromvariable Rotorpumpe
DE10207350C2 (de) * 2001-02-23 2003-05-15 Joma Hydromechanic Gmbh Volumenstromvariable Rotorpumpe
DE10207348C2 (de) * 2001-02-23 2003-06-26 Joma Hydromechanic Gmbh Volumenstromvariable Rotorpumpe
WO2004057191A1 (de) * 2002-12-19 2004-07-08 Joma-Hydromechanic Gmbh Volumenstromvariable innenzahnradpumpe
US7153110B2 (en) 2002-12-19 2006-12-26 Joma-Hydromechanic Gmbh Variable volume flow internal gear pump
CN100390416C (zh) * 2002-12-19 2008-05-28 乔马-流体机械有限公司 体积流量可变的转子泵
FR2865507A1 (fr) * 2004-01-27 2005-07-29 Renault Sas Pompe rotative trochoide a debit variable
CN104776017A (zh) * 2014-01-10 2015-07-15 沃尔沃汽车公司 用于液压装置的控制环
EP2894294A1 (de) * 2014-01-10 2015-07-15 Volvo Car Corporation Steuerring für eine hydrostatische Vorrichtung
CN104776017B (zh) * 2014-01-10 2018-07-03 沃尔沃汽车公司 用于液压装置的控制环
US10167866B2 (en) 2014-01-10 2019-01-01 Volvo Car Corporation Displacement pump and a control ring for a displacement pump

Also Published As

Publication number Publication date
KR880003112A (ko) 1988-05-13
EP0258797A3 (de) 1988-10-05
JPH01104991A (ja) 1989-04-21

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Inventor name: SUGIMOTO, MAMORUITAMI WORKS

Inventor name: TERADA, MUTSUOITAMI WORKS

Inventor name: HASHIMOTO, KIKUOITAMI WORKS

Inventor name: SAEGUSA, YASUYOSHIITAMI WORKS