GB2516523A - Selectable flow hydraulic gear pump - Google Patents

Selectable flow hydraulic gear pump Download PDF

Info

Publication number
GB2516523A
GB2516523A GB201405653A GB201405653A GB2516523A GB 2516523 A GB2516523 A GB 2516523A GB 201405653 A GB201405653 A GB 201405653A GB 201405653 A GB201405653 A GB 201405653A GB 2516523 A GB2516523 A GB 2516523A
Authority
GB
United Kingdom
Prior art keywords
pump
flow
bearing plate
housing
routed
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Withdrawn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
GB201405653A
Other versions
GB201405653D0 (en
Inventor
Wallace K Snead
Thomas G Modica
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.)
Danfoss Power Solutions Inc
Original Assignee
Danfoss Power Solutions Inc
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
Priority claimed from US14/195,226 external-priority patent/US9951771B2/en
Application filed by Danfoss Power Solutions Inc filed Critical Danfoss Power Solutions Inc
Publication of GB201405653D0 publication Critical patent/GB201405653D0/en
Publication of GB2516523A publication Critical patent/GB2516523A/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Withdrawn legal-status Critical Current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
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • 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
    • F04C14/02—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for several machines or pumps connected in series or in parallel
    • 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
    • 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
    • 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

Abstract

A hydraulic gear pump 10 comprising an integral unit 12 having a first gear set associated with a bearing plate housing, a second gear set associated with a cover housing, an inlet 30 common to both housings, check valves 32 and solenoid operated control valves 34 in each housing associated with a first conduit 36, and a second conduit (38, figure 1) in communication with the bearing plate housing and an outlet 40 in the cover housing. The second conduit may be external to the gear sets. Preferably, when the control valve in the bearing plate housing is opened flow from the first gear set is routed to the inlet and when the control valve in the cover housing is opened flow from the second gear set is routed to the inlet. The pump provides up to four different flow rates so as to provide the appropriate output during all phases of an associated machine.

Description

TITLE: SELECTABLE FLOW HYDRAULIC CEAR PUMP
CROSS REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Application No. 61/809,663 filed April 8, 2013.
BACKGROUND OF THE INVENTION
This invention is directed to a multiple section hydraulic gear pump, and more particularly to a hydraulic gear punp capable of providing up to four different flow rates.
There exists a need in the art for a hydraulic pump that has multiple output flows to accommodate various machine functions that are combined with finite machine elements. There also is a need for a pump that minimizes engine HP requirements durinq all phases of machine operation. Finally, there is a need for a pump that is adjustable to allow reduced starting torsional loads during extreme cold engine start conditions.
Therefore, an objective of the present invention is to provide a hydraulic pump that is easily adjustable to provide multiple output flows during all phases of machine operation.
These and other objectives will be apparent to one of ordinary skill in the art based upon the following written
description, drawings and claims.
SUMMARY OF THE INVENT ION
A selective flow hydraulic gear pump has an integral unit with a front pump section and a rear pump section.
The front pump section has a pumping gear set contained within a gear plate associated with, and adjacent to a bearing plate housing. The rear pump section has a pumping gear set contained within a gear plate associated with, and adjacent to a cover housing.
The integral unit has an inlet port common to both the bearing plate housing and the cover housing. Check valves and solenoid operated control valves are contained within the bearing plate housing and the cover housing and are associated with a first fluid conduit. A second fluid conduit is in communication with and extends between the bearing plate housing and an outlet port for the cover housing.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side view of a selective flow hydraulic pump, Fig. 2 is a schematic view of a selective flow hydraulic pump, and Fig. 3 is a side view of a cross section of a selective flow hydraulic pump.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the Figures, a hydraulic gear pump 10 has, within a total number of pumping sections, an integral unit 12 having a pair of pumping gear sets 14 and 16 consisting of gears 18 and 20 contained within gear plates 22 and 24.
The gear sets 14 and 16 are of any displacement available, but will necessarily be of differing displacements to allow medium and low pump flow options, and have a bearing plate housing 26 that separates the gear sets 14 and 16 of the integral unit 12 into a front, or first gear set 14, and a second or rear gear set 16. Gear sets 14 and 16 may be positioned such that gear set 14 is in the front pumping section and gear set 16 is in the rear pumping section, or the great set 16 is in the front pumping section and gear set 14 is in the rear pumping section. For illustrative purposes, however, gear set 14 will be shown as the larger gear set and gear set 16 will be shown as the smaller gear set.
Referring to the integral unit 12 without regard to other pump sections that may exist within the hydraulic gear pump 10, either the bearing plate housing 26, the cover housing 28, or both have an inlet port 30 common to both the front 14 and rear 16 pump sections. Both the bearing plate housing 26 and cover housing 28 have a check valve 32 and a solenoid operated control valve 34 associated with a fluid conduit 36. The check valves 32 and solenoid operated control valve 34 are of any size, shape, and type. The check valve 32 in the bearing plate housing 26 prevents flow from the rear pump section 16 to the front pump section 14. The check valve 32 in the cover housing 28 prevents flow from the front pump section 14 to the rear pump section 16.
External to the gear sets 14 and 16 is a passage or conduit 38 that is in communication with and extends from the front pump section 14 bearing plate housing 26 to a hydraulic outlet port 40 in the cover housing 28.
In operation, to generate high flow, both solenoid operated control valves 34 are caused to close which causes output flows from the front pump section 14 and the rear pump section 16 to combine at the hydraulic outlet port 40.
To generate a medium flcw, with the larger displacement gear set 14 in the rear, the solenoid valve 34 in the bearing plate housing 26 is caused to open so that the flow of the smaller front pump section 16 is rerouted back to the pump inlet 30 at low pressure while flow frort. the rear pump section 14 is routed to the outlet port 40.
To generate medium flow, with the larger displacement gear set 14 in the front, the solenoid valve 34 in the cover housing 28 is caused to open so that the flow in the smaller rear pump section 16 is rerouted back to the pump inlet 30 at low pressure while flow from the front pump section 14 is routed to the outlet port 40.
To generate low flow, with the larger displacement gear set 14 in the rear, the solenoid valve 34 in the bearing plate housing 26 is caused to close while the solenoid valve 34 in the rear pump section cover housing 28 is opened. As a result, flow from the rear pump section 14 is re-routed back to the pump inlet 30 and flow from the smaller front pump section 16 is routed to the outlet port 40.
To generate low flow, with the larger displacement gear set 14 in the front, the solenoid valve 34 in the bearing plate housing 26 is caused to open while the solenoid valve 34 in the rear pump section cover housing 28 is closed. As a result, flow from the front pump section 14 is re-routed back to the pump inlet 30 and flow from the smaller rear pump section 16 is routed to the outlet port 40.
Finally, to generate zero flow, both solenoid valves 34 are caused to be opened such that flows from both the front pump section 36 and the rear pump section 34 are rerouted to pump inlet 30 and no flow is routed to the outlet port 40.
Thus, a selectable flow hydraulic pump has been disclosed that at the very least meets all the stated objectives.

Claims (6)

  1. What is claimed is: 1. A hydraulic gear pump, comprising: an integral unit having a frcnt pump section with a first pumping gear set associated with a bearing plate housing and a rear pump section with a second pumping gear set associated with a cover housing; an inlet port common to both the front and rear pump sections; check valves and solenoid operated control valves in the bearing plate housing and the cover housing that are associated with a first fluid conduit; and a second fluid conduit that is in communication with and extends from the bearing plate housing to an outlet port in the cover housing.
  2. 2. The pump of claim 1 wherein the second fluid conduit is external to the gear sets.
  3. 3. The pump of claim 1 or 2, wherein both solenoid operated control valves are closed causing output flows from the front pump section and the rear pump section to combine at the outlet port.
  4. 4. The pump of claim 1 or 2, wherein the solenoid operated control valve in the bearing plate housing is open such that flow from the front pump section is routed to the inlet port while flow from the rear pump section is routed to the outlet port.
  5. 5. The pump of any one of claims 1 or 2, wherein the solenoid operated control valve in the bearing plate housing is closed while the solenoid operated control valve in the cover housing is opened such that flow from the rear pump section is routed to the inlet port and flow from the front pump section is routed to the outlet port.
  6. 6. The pump of claim 1 or 2, wherein both solenoid operated control valves are cpened such that flow from both the front and rear pump sections are routed to the inlet port and no flow is routed tc the outlet port.
GB201405653A 2013-04-08 2014-03-28 Selectable flow hydraulic gear pump Withdrawn GB2516523A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361809663P 2013-04-08 2013-04-08
US14/195,226 US9951771B2 (en) 2013-04-08 2014-03-03 Selectable flow hydraulic gear pump

Publications (2)

Publication Number Publication Date
GB201405653D0 GB201405653D0 (en) 2014-05-14
GB2516523A true GB2516523A (en) 2015-01-28

Family

ID=50737647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201405653A Withdrawn GB2516523A (en) 2013-04-08 2014-03-28 Selectable flow hydraulic gear pump

Country Status (2)

Country Link
DE (1) DE102014206577A1 (en)
GB (1) GB2516523A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811765A2 (en) * 1996-06-05 1997-12-10 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Internal combustion engine with two-stage internal gear pump
US5842837A (en) * 1995-08-29 1998-12-01 Aisin Seiki Kabushiki Kaisha Tandem pump apparatus
CN202203110U (en) * 2011-08-25 2012-04-25 大连创新零部件制造公司 Sequential control duplex steering pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5842837A (en) * 1995-08-29 1998-12-01 Aisin Seiki Kabushiki Kaisha Tandem pump apparatus
EP0811765A2 (en) * 1996-06-05 1997-12-10 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Internal combustion engine with two-stage internal gear pump
CN202203110U (en) * 2011-08-25 2012-04-25 大连创新零部件制造公司 Sequential control duplex steering pump

Also Published As

Publication number Publication date
DE102014206577A1 (en) 2014-10-09
GB201405653D0 (en) 2014-05-14

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