GB2432631A - Meshing gear type pump controlled by phase adjustment - Google Patents

Meshing gear type pump controlled by phase adjustment Download PDF

Info

Publication number
GB2432631A
GB2432631A GB0523906A GB0523906A GB2432631A GB 2432631 A GB2432631 A GB 2432631A GB 0523906 A GB0523906 A GB 0523906A GB 0523906 A GB0523906 A GB 0523906A GB 2432631 A GB2432631 A GB 2432631A
Authority
GB
United Kingdom
Prior art keywords
pump
hydraulic pump
geared
relative
gears
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Withdrawn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
GB0523906A
Other versions
GB0523906D0 (en
Inventor
Timothy John Sweatman
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0523906A priority Critical patent/GB2432631A/en
Publication of GB0523906D0 publication Critical patent/GB0523906D0/en
Publication of GB2432631A publication Critical patent/GB2432631A/en
Withdrawn legal-status Critical Current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
    • F04C2/12—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
    • 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
    • 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
    • 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
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • 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
    • F04C2210/00—Fluid
    • F04C2210/20—Fluid liquid, i.e. incompressible
    • 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
    • F04C2240/00—Components
    • F04C2240/10—Stators
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/40—Conditions across a pump or machine

Landscapes

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

Abstract

A gear pump comprises two intermeshing gears 11, 12 rotating in a close fitting housing with a relatively large clearance between the gears. The gears are independently driven such one may rotate relative to the other so that the phase relationship between them and thus the clearances between flanks of adjacent meshing teeth may be adjusted. Allows the output pressure of the pump to be adjusted by allowing or preventing backflow between the meshing gears.

Description

<p>Improved Hydraulic Pump This invention relates to a hydraulic pump
wherein hydraulic fluid is pumped by intermeshing gears and wherein the fluid pressure is variable independently of the gear speed. Such pumps have numerous applications, for example hydraulic ram operation and automobile powered steering systems.</p>
<p>Gear operated hydraulic pumps generally in accordance with the arrangment shown in Figures 1 and 2 are well known. In these pumps 1 a pair of toothed wheels 2 and 3 rotate in a close-fitting casing 4. One wheel 2 is driven by a shaft 9 and the other wheel 3 is driven by the wheel 2 Hydraulic fluid 5 is forced between the gear teeth and the casing. If the system supplied by the pump allows the fluid to flow, it emerges from the outlet port 6. If the demand for fluid is reduced or stopped oil is forced through the pressure relief valve 7 and returned to the inlet of the pump. This system maintains a roughly constant hydraulic output pressure for any given speed of the toothed wheels 2 and 3. However, it is highly inefficient in energy consumption; much energy going into driving the toothed wheels and heating the hydraulic fluid.</p>
<p>According to the present invention high clearance toothed wheels are employed and these are independently driven and phased relative to each other. Depending on the phasing of the gears a proportion of the hydraulic fluid is allowed to flow back between the gear teeth, thus adjusting the outlet pressure. A safety valve 16 may still be fitted, although this will only operate to relieve exceptional or dangerous pressures. This arrangement permits the pump to be driven at a constant speed, as in the case of an automobile steering pump, while allowing the output pressure to be varied to suit the demand. At times of low fluid demand the torque required to drive the pump and the heating of the hydraulic fluid are thus greatly reduced.</p>
<p>A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a conventional gear pump Figure 2 shows a sectional view (A-A') of a conventional gear pump Figure 3 shows a gear pump with variable phasing of the toothed wheels (1) Figure 4 shows a sectional view (B-B') of the modified pump in Figure 3 Figure 5 shows the modified pump with toothed wheels phased for minimum hydraulic pressure.</p>
<p>In the present invention illustrated in Figures 3, 4 and 5 high clearance toothed wheels 11 and 12 are driven independently of each other by shafts 13 and 14. The phasing of the wheels relative to each other can be varied by a phase changing mechanism 15 similar to but not limited to that described in UK Patent Application No. 0523378.8.</p>
<p>With this arrangement, the outlet pressure of the pump can be varied by adjusting the phasing of the toothed wheels 11 and 12. For maximum pressure the wheels are phased as shown in Figure 3, and the pump operates as described above for a conventional pump. For minimum pressure the wheels are phased as shown in Figure 5, wherein the inter-tooth spacing 17 is maximised and hydraulic fluid is allowed to flow back between the gear teeth. Adjustment of the fluid pressure to any value between these two extremes is achieved by adjusting the phasing of the gears and hence the inter-tooth spacing 17 to any intermediate value. (2)</p>

Claims (1)

  1. <p>CLAIMS: 1. A geared hydraulic pump wherein the output fluid pressure is
    adjusted by allowing hydraulic fluid to return between the teeth of the toothed wheels which comprise the moving parts of the pump.</p>
    <p>2. A geared hydraulic pump wherein two toothed gear wheels with high clearance gear teeth are independently driven adjustably to enable variable rotational phase relative to each other.</p>
    <p>3. A geared hydraulic pump as described in Claims 1 and 2 wherein the relative phasing of the toothed gear wheels is achieved using a phase changing gear box.</p>
    <p>4. A geared hydraulic pump as described in Claim 3 wherein the relative phases of the drive shafts is controlled automatically by the output pressure of the pump.</p>
    <p>5. A geared hydraulic pump as described in Claim 3 wherein the relative phases of the drive shafts is controlled by the rate of flow of the hydraulic fluid.</p>
    <p>6. A geared hydraulic pump as described in Claim 3 wherein the relative phase of the drive shafts is controlled in accordance with the demand of the system either manually or by reference to some parameter of the system of which the pump is a part.</p>
    <p>7. A geared hydraulic pump substantially as described herein with reference to Figures 1 to 5 attached hereto.</p>
GB0523906A 2005-11-24 2005-11-24 Meshing gear type pump controlled by phase adjustment Withdrawn GB2432631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0523906A GB2432631A (en) 2005-11-24 2005-11-24 Meshing gear type pump controlled by phase adjustment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0523906A GB2432631A (en) 2005-11-24 2005-11-24 Meshing gear type pump controlled by phase adjustment

Publications (2)

Publication Number Publication Date
GB0523906D0 GB0523906D0 (en) 2006-01-04
GB2432631A true GB2432631A (en) 2007-05-30

Family

ID=35601107

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0523906A Withdrawn GB2432631A (en) 2005-11-24 2005-11-24 Meshing gear type pump controlled by phase adjustment

Country Status (1)

Country Link
GB (1) GB2432631A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2493275A (en) * 2011-07-26 2013-01-30 Hamilton Sundstrand Corp Gear pump with recirculation line
US20130251581A1 (en) * 2012-01-31 2013-09-26 Jung & Co. Geratebau Gmbh Two-Spindle Pump of Single-Flow Construction
WO2019206857A1 (en) * 2018-04-24 2019-10-31 Nidec Gpm Gmbh Controllable lubricating oil delivery system for internal combustion engines

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704704A (en) * 1927-08-08 1929-03-12 Albert E Grant Gear pump
US1912737A (en) * 1930-02-24 1933-06-06 Ernest J Svenson Adjustable displacement gear pump
US3077835A (en) * 1956-12-11 1963-02-19 Reiners Walter Controllable hydraulic geartype machine
GB2123089A (en) * 1982-07-08 1984-01-25 Maag Zahnraeder & Maschinen Ag Gear pump
GB2194589A (en) * 1986-08-28 1988-03-09 Karl Evert Joelson Gear pump in a hydraulic actuator control
DE3840909A1 (en) * 1987-12-17 1989-06-29 Volkswagen Ag Gear pump with delivery rate control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704704A (en) * 1927-08-08 1929-03-12 Albert E Grant Gear pump
US1912737A (en) * 1930-02-24 1933-06-06 Ernest J Svenson Adjustable displacement gear pump
US3077835A (en) * 1956-12-11 1963-02-19 Reiners Walter Controllable hydraulic geartype machine
GB2123089A (en) * 1982-07-08 1984-01-25 Maag Zahnraeder & Maschinen Ag Gear pump
GB2194589A (en) * 1986-08-28 1988-03-09 Karl Evert Joelson Gear pump in a hydraulic actuator control
DE3840909A1 (en) * 1987-12-17 1989-06-29 Volkswagen Ag Gear pump with delivery rate control

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2493275A (en) * 2011-07-26 2013-01-30 Hamilton Sundstrand Corp Gear pump with recirculation line
US8790090B2 (en) 2011-07-26 2014-07-29 Hamilton Sundstrand Corporation Priming of gear pump in alternative attitudes
GB2493275B (en) * 2011-07-26 2015-02-18 Hamilton Sundstrand Corp Priming of gear pump in alternative attitudes
US20130251581A1 (en) * 2012-01-31 2013-09-26 Jung & Co. Geratebau Gmbh Two-Spindle Pump of Single-Flow Construction
US9624925B2 (en) * 2012-01-31 2017-04-18 Jung and Co. Geratebau, GMBH Two-spindle pump of single-flow construction
WO2019206857A1 (en) * 2018-04-24 2019-10-31 Nidec Gpm Gmbh Controllable lubricating oil delivery system for internal combustion engines
US11066967B2 (en) 2018-04-24 2021-07-20 Nidec Gpm Gmbh Controllable lubricating oil delivery system for internal combustion engines

Also Published As

Publication number Publication date
GB0523906D0 (en) 2006-01-04

Similar Documents

Publication Publication Date Title
JP4449024B2 (en) Fluid coupling for auxiliary drive shaft of vehicle power transmission system
CN104379934B (en) There is the hydraulic system for axial thrust balancing, the gear pump with helical tooth or mekydro motor
EP0792411B1 (en) Hydraulic motor system
US7056101B1 (en) Inline tandem pump
JP3972072B2 (en) Fluid pressure device
US20080107554A1 (en) Pump Control Using Overpressure Source
US6332522B1 (en) Hydraulic coupling for vehicle drivetrain
US3515496A (en) Variable capacity positive displacement pump
RU140623U1 (en) PUMP
US6592486B1 (en) Drive unit for a vehicle with a continuously variable transmission
DE112011102058B4 (en) Internal gear oil pump for a vehicle
EP2235374B1 (en) Variable-volume internal gear pump
US3113524A (en) Gear pump with trapping reliefs
KR100804916B1 (en) Power steering system
GB2324573A (en) Gerotor pump
GB2432631A (en) Meshing gear type pump controlled by phase adjustment
US20040191103A1 (en) Gear pump
US3443522A (en) Positive-displacement pump
US20100215531A1 (en) Method for converting energy from compressed air into mechanical energy and compressed air motor therefor
CA2267971A1 (en) Drive head assembly
JP2015528869A (en) Gear pump
US10995751B2 (en) Lobe gear pump with inducer assembly and centrifugal pump having one fluid flow path
WO2005103488A2 (en) Device for controlling parasitic losses in a fluid pump
US10215154B2 (en) Eccentrically piloted hydraulic commutator
JP3801536B2 (en) Internal gear type oil pump and automatic transmission equipped with the same

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)