GB1586374A - Gear pump or motor - Google Patents

Gear pump or motor Download PDF

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Publication number
GB1586374A
GB1586374A GB7116/78A GB711678A GB1586374A GB 1586374 A GB1586374 A GB 1586374A GB 7116/78 A GB7116/78 A GB 7116/78A GB 711678 A GB711678 A GB 711678A GB 1586374 A GB1586374 A GB 1586374A
Authority
GB
United Kingdom
Prior art keywords
shaft
gear
gear wheel
gear wheels
wheels
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
Application number
GB7116/78A
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 GB1586374A publication Critical patent/GB1586374A/en
Expired legal-status Critical Current

Links

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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C2/18—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 similar tooth forms

Description

(54) A GEAR PUMP OR MOTOR (71) We, ROBERT BOSCH GmbH, a German company of Postfach 50, 7000 Stuttgart 1, Germany., do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a gear pump or motor.
In a gear pump consisting of a gear wheel on a drive shaft and a gear wheel on a driven shaft, the two gear wheels being in external meshing engagement. there are pulses in the delivery from the pump. To reduce this pulsation. it is known to arrange a plurality of gear wheels on the drivina and driven shafts, the teeth of which are rotated with respect to each other in a peripheral direction. This results in manufacturing costs which are too high for many purposes.
We have now devised a gear pump (which can also be operated as a motor). in which the pulsation is reduced and which can be made at comparatively low cost.
According to the invention. there is provided a gear pump or motor comprising two pairs of gear wheels. the first members of the said pairs and the second members of the said pairs respectivelv meshing in external engagement. the members of the first pair of gear wheels being mounted on a drive, or output. shaft normal to the axis of the shaft. the teeth of the gear wheels of this pair lying substantially coincident with one another. the first member of the first pair lying nearer to a drive or output end of the said shaft and being fixedlv arranged on the shaft. the second member of the first pair bering freelv rotatable about the shaft and axially displaceable on the drive shaft:: and wherein the two members of the second pair of gear wheels are fixedly mounted on a driven. or idler. shaft normal to the axis of the shaft: the first and second members of each pair of gear wheels being spaced apart axially of the respective shafts. and wherein a plate is provided in the space between the said first and second members of the pairs.
Preferably, both the gear wheels of the second pair on the driven shaft, form a unit with the shaft. In one alternative, however, one of the gear wheels on the driven shaft is formed as a separate part and is connected for rotation with the shaft, by connecting means.
In the gear pumps of the invention. the tooth flanks which are in engagement alternate whereby the points of action of the two partial sets of teeth (of the two first members and the two second members) move over two intersecting lines of action and advance or lag with respect to each other by one half of the length of action, In so doing.
the pulsation from the partial delivery flows are superimposed. wherebv the amplitude of the total delivery flow pulsation is reduced to about one quarter of its original value.
In order that the invention mav be more fullv understood. embodiments thereof will now be described. by way of example only, with reference to the accompanying drawings. in which: Figure 1 shows two externally meshing gear wheels and is for illustrating a principle of the invention: Figltles 2 and 3 are longitudinal sections of two embodiments of gear pump of the invention: and Figures 4 to 6 show plate members for the pumps of Figures 7 and 3.
Preferring to Figure 2. the gear machine has a housing which is closed at both ends by covers II. 12. In the interior of the housing.
two bearing members 13. 14 are arranged in which is mounted a drive shift 15. Its drive journal 15' passes through a bore 16 in the cover I and is sealed towards the outsidc.
Two gear wheels 17. 18. which are prefer ably of the same width, are arranged on the drive shaft between the bearing members 13 and t4 and in contact with each other. The gear wheel 17 is fixed to the drive shaft 15, the gear wheel 18 is rotatable and axially displaceable on the shaft 15.
Each gear wheel 17. 18 meshes in external engagement with respectively. a gear wheel 30. 32 which are both fixedly arranged on a driven shaft 31 which is mounted in bearing members 23. 24. The gear wheel 17 is spaced axially from the gear wheel 18. and the gear wheel 3() is spaced from gear wheel 32. An intermediate plate 33 is arranged between the pairs of gear wheels lying at the same distance from each other and fills the entire space in the housing between the gear wheels. Such an intermediate plate is illustrated in Figure 4. Due to the gear wheel 32 being arranged for rotation with the driven shaft 31. it is displaceable laterally to some extent. The teeth on the two wheels 30. 32 have the same angular position. that is to say the tooth crests and the tooth spaces lie one above the other.
The bearing members 13. 14. 23. 24 form a plane together with the side surfaces of the gear wheels. Preferably and in known manner, the hearing members are influenced bv pressure fields so that thev are ureed sea- lingly against the side surfaces of the gear wheels.
If the machine operates as a pump. then the gear wheel 3() is driven bv the gear wheel 17 fixedly arranged on its shaft. and the gear wheel 18 looselv arranged on the drive shaft 15 is driven bv the gear wheel 32. Due to the torque transmission from the gear wheel 17 to the gear wheel 3() and from gear wheel 32 to the gear wheel 18. the tooth flanks which are in engagement alternate. The points of action of the two partial sets of teeth move over two intersecting lines of action a and b (see Figure 1) and advancing or lagging with respect to each other by one half of the length of action.This means that the pulsations of the partial delivery flows of the ecir wheels 17. 18 are superimposed by the gear wheels 3(). 32 hereby the amplitude of the entire delivery flow pulsation is reduced to ahout one quarter of its original value. The iiilet and outlet ducts 25. 16 - these extend in the same axial direction and ire illustrated in Figure 2 in dotted lines - are at the level of the intermediate plate 33.In the latter. a recess 34 is formed w which is located at the inlet duct. On the opposite side a recess 35 is formed which is located at the outlet duct.
The seal ot the tooth engigement cm be improved if the flank clearance in at least one of the pails 0t gear wheels is VCI!' small or is zero. which is Ill preferabl' the cise with the gear wheel 18.
The embodiment of Figure 3 is completc- ly equivalent to that according to the cmbo- diment of Figure 2. Like parts are referenced with the same numerals. The wheels and their arrangement on the-drive shaft 15 are the same. whereas the driven shaft 35 and the gear wheels 36,37 consist of a single part. Thus, the shaft and the gear wheels form an integral component. The distances between the gear wheels are bridged in this embodiment by a partial intermediate plate 38 as is illustrated in Figure 5.The rounded portion 39 is provided with the lugs 40. 41 on the intermediate plate extend at least far enough into an annular groove 43 between the wheels 36. 37 for the action region of the gear wheels to be completely covered and for sealing between the rounded portion 39 (high pressure) and the recess 34 (low pressure) to be guaranteed by the lugs 41.
The intermediate plate 33 according to the embodiment of Figure 2, can also be sub-divided in a plane normal to the gear wheel shafts, wherein pressure fields are built-up between the two parts so that the half plates are forced sealingly against the side surfaces of the gear wheels.
As Figure 6 shows. the intermediate plate 33 can also be transverselv divided.
WHAT WE CLAIM IS: 1. A gear pump or motor comprising two pars of gear wheels. the first members of the said pairs and the second members of the said pairs respectively meshing in external engagement. the members of the first pair of gear wheels being mounted on a drive. or output. shaft normal to the axis of the shaft. the teeth of the gear wheels of this pair lying substantially coincident with one another. the first member of the first pair Iving nearer to a drive or output end of the said shaft and being fixedly arranged on the shaft. the second member of the first pair being freely rotatable about the shaft and axially displaceable on the drive shaft: and wherein the two members of the second pair of gear wheels are fixedly mounted on a driven. or idler. shaft normal to the axis of the shaft: the first and second members of each pair of gear wheels being spaced apart axially of the respective shafts. and wherein a plate is provided in the space between the said first and second members of the pairs.
2. A pump or motor according to claim wherein both the gear wheels of the second pair on the driven shaft. form a unit with the shaft.
3. A pump or motor according to claim wherein one of the gear wheels on the driven shaft is formed as a separate part and is connected for rotation with the shaft. by connecting means.
4. A pump or motor according to claim 3 wherein the connecting means is a spring kev. a wedge or a spline.
zu A pump or motor according to claim 1. 2. 3 or 4. wherein the plate fills the entire
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    ably of the same width, are arranged on the drive shaft between the bearing members 13 and t4 and in contact with each other. The gear wheel 17 is fixed to the drive shaft 15, the gear wheel 18 is rotatable and axially displaceable on the shaft 15.
    Each gear wheel 17. 18 meshes in external engagement with respectively. a gear wheel 30. 32 which are both fixedly arranged on a driven shaft 31 which is mounted in bearing members 23. 24. The gear wheel 17 is spaced axially from the gear wheel 18. and the gear wheel 3() is spaced from gear wheel 32. An intermediate plate 33 is arranged between the pairs of gear wheels lying at the same distance from each other and fills the entire space in the housing between the gear wheels. Such an intermediate plate is illustrated in Figure 4. Due to the gear wheel 32 being arranged for rotation with the driven shaft 31. it is displaceable laterally to some extent. The teeth on the two wheels 30. 32 have the same angular position. that is to say the tooth crests and the tooth spaces lie one above the other.
    The bearing members 13. 14. 23. 24 form a plane together with the side surfaces of the gear wheels. Preferably and in known manner, the hearing members are influenced bv pressure fields so that thev are ureed sea- lingly against the side surfaces of the gear wheels.
    If the machine operates as a pump. then the gear wheel 3() is driven bv the gear wheel 17 fixedly arranged on its shaft. and the gear wheel 18 looselv arranged on the drive shaft
    15 is driven bv the gear wheel 32. Due to the torque transmission from the gear wheel 17 to the gear wheel 3() and from gear wheel 32 to the gear wheel 18. the tooth flanks which are in engagement alternate. The points of action of the two partial sets of teeth move over two intersecting lines of action a and b (see Figure 1) and advancing or lagging with respect to each other by one half of the length of action.This means that the pulsations of the partial delivery flows of the ecir wheels 17. 18 are superimposed by the gear wheels 3(). 32 hereby the amplitude of the entire delivery flow pulsation is reduced to ahout one quarter of its original value. The iiilet and outlet ducts 25. 16 - these extend in the same axial direction and ire illustrated in Figure 2 in dotted lines - are at the level of the intermediate plate 33.In the latter. a recess 34 is formed w which is located at the inlet duct. On the opposite side a recess 35 is formed which is located at the outlet duct.
    The seal ot the tooth engigement cm be improved if the flank clearance in at least one of the pails 0t gear wheels is VCI!' small or is zero. which is Ill preferabl' the cise with the gear wheel 18.
    The embodiment of Figure 3 is completc- ly equivalent to that according to the cmbo- diment of Figure 2. Like parts are referenced with the same numerals. The wheels and their arrangement on the-drive shaft 15 are the same. whereas the driven shaft 35 and the gear wheels 36,37 consist of a single part. Thus, the shaft and the gear wheels form an integral component. The distances between the gear wheels are bridged in this embodiment by a partial intermediate plate 38 as is illustrated in Figure 5.The rounded portion 39 is provided with the lugs 40. 41 on the intermediate plate extend at least far enough into an annular groove 43 between the wheels 36. 37 for the action region of the gear wheels to be completely covered and for sealing between the rounded portion 39 (high pressure) and the recess 34 (low pressure) to be guaranteed by the lugs 41.
    The intermediate plate 33 according to the embodiment of Figure 2, can also be sub-divided in a plane normal to the gear wheel shafts, wherein pressure fields are built-up between the two parts so that the half plates are forced sealingly against the side surfaces of the gear wheels.
    As Figure 6 shows. the intermediate plate 33 can also be transverselv divided.
    WHAT WE CLAIM IS: 1. A gear pump or motor comprising two pars of gear wheels. the first members of the said pairs and the second members of the said pairs respectively meshing in external engagement. the members of the first pair of gear wheels being mounted on a drive. or output. shaft normal to the axis of the shaft. the teeth of the gear wheels of this pair lying substantially coincident with one another. the first member of the first pair Iving nearer to a drive or output end of the said shaft and being fixedly arranged on the shaft. the second member of the first pair being freely rotatable about the shaft and axially displaceable on the drive shaft: and wherein the two members of the second pair of gear wheels are fixedly mounted on a driven. or idler. shaft normal to the axis of the shaft: the first and second members of each pair of gear wheels being spaced apart axially of the respective shafts. and wherein a plate is provided in the space between the said first and second members of the pairs.
    2. A pump or motor according to claim wherein both the gear wheels of the second pair on the driven shaft. form a unit with the shaft.
    3. A pump or motor according to claim wherein one of the gear wheels on the driven shaft is formed as a separate part and is connected for rotation with the shaft. by connecting means.
    4. A pump or motor according to claim 3 wherein the connecting means is a spring kev. a wedge or a spline.
    zu A pump or motor according to claim 1. 2. 3 or 4. wherein the plate fills the entire
    space between the two pairs of gear wheels.
    6. A pump or motor according to claim 1. 2, 3 or 4. wherein the plate fills onlv the space between the gear wheels on the drive shaft.
    7. A pump or motor according to any preceding claim. wherein the flank clearance at at least one pair of teeth is very small or zero.
    8. A pump or motor according to anv preceding claim. wherein those gear wheels which are formed separate from a shaft are axially displaceable thereon.
    9. A pump or motor according to claim 1, wherein the plate is divided normal to the axis of the gear wheel shafts. and pressure fields are built up between the halves of the plate.
    10. A pump or motor according td claim 1 wherein the plate is divided transversely of its longitudinal axis.
    11. A pump or motor according to any preceding claim wherein the gear wheels of the first pair are of substantiallv the same width.
    12. A gear pump or motor substantiallv as herein described with reference to Figures 3 and 5. or Figures 2 and 6. or Figures 2 and 4.
GB7116/78A 1977-03-08 1978-02-22 Gear pump or motor Expired GB1586374A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2709913A DE2709913C2 (en) 1977-03-08 1977-03-08 Gear pump

Publications (1)

Publication Number Publication Date
GB1586374A true GB1586374A (en) 1981-03-18

Family

ID=6002994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7116/78A Expired GB1586374A (en) 1977-03-08 1978-02-22 Gear pump or motor

Country Status (6)

Country Link
JP (1) JPS53112506A (en)
BR (1) BR7801364A (en)
DE (1) DE2709913C2 (en)
FR (1) FR2383334A1 (en)
GB (1) GB1586374A (en)
IT (1) IT1093125B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2755478A1 (en) * 1996-11-06 1998-05-07 Georges Briere Sa VOLUMETRIC PUMP FOR VISCOUS LIQUIDS, ESPECIALLY FOR MOLASSES AND COOKED MASSES OF SUGAR ORIGIN, INCLUDING ROTORS WITH HELICOIDAL LOBES ALTERNATIVELY RIGHT AND LEFT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19549507C2 (en) * 1995-04-12 2002-06-06 Bosch Gmbh Robert Device for delivering fuel from a storage tank to an internal combustion engine of a motor vehicle
DE19652158C2 (en) * 1996-12-14 1999-05-06 Bosch Gmbh Robert Gear machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973994C (en) * 1954-06-26 1960-08-11 Daimler Benz Ag Gear pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2755478A1 (en) * 1996-11-06 1998-05-07 Georges Briere Sa VOLUMETRIC PUMP FOR VISCOUS LIQUIDS, ESPECIALLY FOR MOLASSES AND COOKED MASSES OF SUGAR ORIGIN, INCLUDING ROTORS WITH HELICOIDAL LOBES ALTERNATIVELY RIGHT AND LEFT
EP0843094A1 (en) * 1996-11-06 1998-05-20 Georges Briere S.A. Helical gear pump

Also Published As

Publication number Publication date
JPS53112506A (en) 1978-10-02
DE2709913C2 (en) 1985-06-13
IT1093125B (en) 1985-07-19
IT7820655A0 (en) 1978-02-28
BR7801364A (en) 1978-09-26
FR2383334A1 (en) 1978-10-06
DE2709913A1 (en) 1978-09-21
FR2383334B3 (en) 1980-11-28

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee