US20200208629A1 - Pump assembly having two pumps provided in a single housing - Google Patents
Pump assembly having two pumps provided in a single housing Download PDFInfo
- Publication number
- US20200208629A1 US20200208629A1 US16/722,543 US201916722543A US2020208629A1 US 20200208629 A1 US20200208629 A1 US 20200208629A1 US 201916722543 A US201916722543 A US 201916722543A US 2020208629 A1 US2020208629 A1 US 2020208629A1
- Authority
- US
- United States
- Prior art keywords
- pump
- housing
- drive shaft
- inlet
- pump assembly
- 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.)
- Abandoned
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Classifications
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- 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
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- 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
- F04C11/008—Enclosed motor pump units
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- 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
- F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
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- 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
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- 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
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- 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
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- 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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/10—Rotary-piston pumps specially adapted for elastic fluids 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
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- 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
- F04C2/086—Carter
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- 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
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- 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
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- 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
- F04C2/123—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 radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
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- 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
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- 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
- F04C2/22—Rotary-piston machines or pumps of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member
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- 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
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
- F04C2/3442—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
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- 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
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
- F04C2/356—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
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- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0435—Pressure control for supplying lubricant; Circuits or valves therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0436—Pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0441—Arrangements of pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0446—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control the supply forming part of the transmission control unit, e.g. for automatic transmissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
- F16N13/20—Rotary pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N23/00—Special adaptations of check valves
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- 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
- F04C2210/14—Lubricant
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- 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
- F04C2240/30—Casings or housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
- F16H61/0265—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
- F16H61/0267—Layout of hydraulic control circuits, e.g. arrangement of valves
Definitions
- the present disclosure is generally related to a two stage pump assembly that includes a first pump and a second pump containing in a single housing.
- Dual pump systems that include more than one pump are generally known in the art. In some cases, these systems are designed to use one pump in certain circumstances, and another, different pump in other circumstances.
- U.S. Publication No. 20170058895 and U.S. Pat. No. 4,519,755 provide examples of these type of systems that use a second pump for pumping in certain circumstances.
- the output of the pump is variable. See, e.g., U.S. Publication Nos. 20090041593 and 20110129359 for such examples of varying output from a pump.
- the assembly includes: a first pump and a second pump for pumping lubricant, both the first pump and the second pump being integrated into a single housing and each configured to pressurize lubricant input into the housing.
- a drive shaft is provided in the housing configured to rotate about a drive axis and drive both the first pump and the second pump. The drive shaft is driven by a single input device. Both the first pump and the second pump have at least one gear configured and arranged to be rotated by the drive shaft.
- the first pump has a first inlet provided on the housing for receiving lubricant from a source outside the housing and a first outlet for directing lubricant that is pressurized out of the housing.
- the second pump has a second inlet provided on the housing for receiving lubricant from the source outside the housing and a second outlet for directing lubricant that is pressurized out of the housing.
- the second inlet and the second outlet are different than the first inlet and the first outlet, respectively.
- the housing further includes a wall that is common (or common wall) to both the first pump and the second pump, the first pump being provided on a first side of the wall and the second pump being provided on a second side of the wall that is opposite to the first side.
- the drive shaft extends through the wall and connects to each of the at least one gears of both the first pump and the second pump.
- Another aspect of this disclosure provides the above noted two stage pump assembly with a transmission (or other system designed to receive pressurized lubricant from the pump assembly).
- the second pump is configured to continuously pump the lubricant to the transmission/system.
- the transmission comprises a clutch system that selectively receives lubricant pumped from the first pump.
- a control valve may be provided for limiting the lubricant that is output from the first pump to the clutch system of the transmission.
- FIG. 1 is a perspective view of a pump assembly from a first side thereof in accordance with an embodiment of the present disclosure.
- FIG. 2 is a perspective view of the pump assembly of FIG. 1 from a second side thereof.
- FIG. 3 is an alternate perspective view of the pump assembly of FIG. 2 with a second cover removed therefrom, showing a portion of a second pump in the assembly, in accordance with an embodiment.
- FIG. 4A is a cross sectional view through line 4 - 4 of FIG. 3 , showing parts of the housing, the second pump and a first pump contained in the pump assembly, in accordance with an embodiment.
- FIG. 4B is an alternate cross sectional view through the housing shown in FIG. 3 , showing another view of parts within the housing.
- FIG. 4C is a cross sectional view through the first pump showing an inlet and outlet thereof, in accordance with an embodiment.
- FIG. 5 shows a connection and drive shaft of the first and second pumps, and a first cover, of the pump assembly in accordance with an embodiment.
- FIG. 6 shows an exploded view of the parts shown in FIG. 5 , without the first cover.
- FIG. 7 shows an exploded view of the pump assembly of FIG. 1 .
- FIGS. 8 and 9 show perspective views of the pump assembly of FIG. 1 connected with a driver in accordance with an embodiment.
- FIG. 10 shows an exploded view of the parts shown in FIGS. 8 and 9 .
- FIG. 11A shows a cross sectional view of the pump assembly and driver as shown in FIGS. 8 and 9 , in accordance with an embodiment.
- FIGS. 11B and 11C show a front perspective view and a back perspective view, respectively, of the driver including cooling fins, in accordance with an embodiment.
- FIG. 12 is a schematic drawing showing options for operating the herein disclosed pump assembly for pumping lubricant to a transmission.
- FIG. 13 is a is a schematic drawing of a system including the pump assembly as disclosed herein.
- FIG. 14 is an underside view of a cover of one of the pumps in the pump assembly disclosed herein, including a seal.
- FIG. 15 is a cross sectional view through a housing of a pump assembly, in accordance with another embodiment of this disclosure, having a first pump and a second pump therein.
- FIGS. 16 and 17 show exploded, perspective views of parts of the pump assembly of FIG. 15 from a first side and a second side, respectively.
- FIG. 18 is a perspective view of a pump assembly from a first side thereof in accordance with yet another embodiment of the present disclosure, having a first pump and a second pump therein.
- FIG. 19 is a perspective view of the pump assembly of FIG. 18 from a second side thereof.
- FIG. 20 is a top view of the pump assembly of FIG. 18 .
- FIG. 21 is a bottom view of the pump assembly of FIG. 18 .
- FIG. 22 is a first side view of the pump assembly of FIG. 18 .
- FIG. 23 is a second side view of the pump assembly of FIG. 18 .
- FIG. 24 is an alternate perspective view of the pump assembly of FIG. 18 with a second cover removed therefrom, showing a portion of a second pump in the assembly, in accordance with an embodiment.
- FIG. 25 is an alternate perspective view from the second side of the pump assembly of FIG. 19 with a first cover removed therefrom, showing a portion of a first pump in the assembly, in accordance with an embodiment.
- FIG. 26 shows an exploded view of parts of the pump assembly as shown in FIGS. 18 and 19 .
- FIG. 27A is a cross sectional view of the pump assembly as shown in FIGS. 18 and 19 , in accordance with an embodiment, and FIG. 27B is an alternate view of FIG. 27A showing details of the drive shaft of the pump assembly.
- FIG. 28 is a full side view of the second pump in the assembly as shown in FIG. 24 , with the second cover removed therefrom, in accordance with an embodiment.
- the pump assembly described herein contains multiple pumps within in a single housing or block. Each pump is provided with distinct inlets and outlets that allow for selective output from one of the pumps, while the other pump regularly or continuously supplies/outputs pressurized lubricant to a system (e.g., transmission or engine) during operation.
- a common wall is provided in the housing, between parts of the two pumps, and forms part of the internal chambers for each pump.
- the herein disclosed pump assembly includes a low pressure pump and high pressure pump (that is, two stages of pressure) that are configured to be driven off the same drive shaft.
- the herein disclosed pump assembly includes a low pressure gerotor pump and a pressure-compensated, high pressure external gear pump that are paired together and configured to be driven off the same drive shaft.
- FIGS. 1 and 2 illustrate perspective views from two sides of a two-stage pump assembly 10 in accordance with this disclosure.
- the pump assembly 10 is used to pressurize and pump lubricant to an outside system such as a transmission (e.g., see transmission 102 of FIG. 13 ) or an engine.
- lubricant refers to fluids such as transmission fluid or (engine) oil that may be pressurized and directed to a system, e.g., for cooling and lubrication purposes.
- this disclosure describes the fluid as transmission fluid used with a transmission. However, this design may be used with engine oil and an engine as well.
- the “two-stages” addressed by the disclosed pump assembly refer to the pump assembly 10 being able to provide two stages of pressure levels, i.e., a first, higher pressure and a second, lower pressure. That is, in some embodiments, a first pump 20 and a second pump 30 are provided for pumping lubricant (e.g., oil); each pump is configured to pressurize lubricant input into the housing. In the illustrated embodiments, the first pump 20 and the second pump 30 are co-axially aligned and driven using a driver (e.g., a motor or engine).
- a driver e.g., a motor or engine
- the disclosed assembly 10 includes, integrated into a single housing 12 , the first pump 20 (see FIG. 4A ) that is a “high pressure” pump designed for selective output operation, i.e., when higher pressurized lubricant is required by the outside system, and the second pump 30 (also shown in FIG. 4A ) that is a “low pressure” pump designed for continuously pumping lower pressurized lubricant to the system.
- the second pump 30 continuously outputs pressurized lubricant as the pump assembly 10 is operated, while the output from the first pump 20 is limited. Further details regarding the high and low pressure ranges addressed by the pump assembly 100 are described later.
- the pump assembly 10 B comprises a tandem pump assembly having, integrated into a single housing 12 and with a common drive shaft and common wall (see FIGS. 27A-B ), a first pump 20 B (see FIGS. 20 and 26 ) for pumping air and a second pump 30 B (also shown in FIGS. 20 and 26 ) for pumping lubricant or fluid to a system. Further details regarding the tandem pump assembly 10 B are also described further below.
- a drive shaft 24 is provided in the housing 12 and is configured to rotate about a drive axis A-A.
- the drive shaft 24 drives both the first pump 20 and the second pump 30 .
- Both the first pump 20 and the second pump 30 have at least one gear that is configured and arranged to be rotated by the drive shaft 24 .
- the drive shaft 24 may directly or indirectly rotate each of these gears about axis A-A.
- gear 46 of first pump 20 and gear 56 of second pump 30 may be the gears that are driven by the drive shaft 24 .
- the housing 12 of the pump assembly 10 includes a first side 14 (see FIG. 1 ) with a (first) cover plate 16 (covering parts of one of the pumps therein) and a second side 18 (see FIG. 2 ) with a (second) cover plate 36 (covering parts of the other pump therein).
- first cover plate 16 is associated with the first pump 20 is a fixed cover plate designed for axial clearance pressure using pump pressure.
- the first cover plate 16 may be secured to the housing 12 , and thus is not floating.
- the cover plate 16 may be removably secured to first side 14 of housing 12 via one or more fasteners 38 (e.g., bolts, that extend through corresponding openings within the housing) (see FIG. 1 ), in accordance with an embodiment.
- a pressure compensation plate or spacer 50 inside the cover is configured to float in the housing 12 and is loaded into a gearset (e.g., gears 46 , 48 , which are described later below) by a seal (e.g., seal 43 ), and then by pressure on the cover side of the plate.
- the cover plate 36 may be removably secured to second side 18 of housing 12 via one or more fasteners 40 (e.g., bolts, that extend through corresponding openings within the housing) (see FIG. 2 ).
- the housing 12 may include openings or cutouts therein, such as indicated at 27 in FIGS. 1 and 2 , which act as weight saving areas within the housing. That is, the weight saving cutout portions 27 in housing 12 are designed to reduce the overall weight of the pump assembly 10 .
- the housing 12 may include locating dowels 29 that are inserted into corresponding openings in the housing 12 and covers 36 and/or 16 , in order to assist in placement and securement of the covers to the housing.
- the dowels 29 may be cylindrically shaped and hollow, in accordance with one embodiment.
- one or more bolt holes 31 may be provided in the housing for receipt of fasteners/bolts therein, in order to secure the covers and/or additional parts to the housing 12 .
- the housing 12 further includes a top side 26 (shown on top in FIGS. 1, 2, and 8 ), a bottom side 28 (shown on bottom in FIGS. 4A and 8 ), a front side 32 (shown on the right in FIG. 1 ) and a back side 34 (shown on the right in FIG. 2 ).
- the first side 14 , the top side 26 , and the front side 32 may include inlet and outlet openings for each of the pumps 20 , 30 contained in the housing 12 .
- the first pump 20 may include a first inlet 60 (see FIG. 4C ) provided in or on the housing 12 for receiving lubricant from a source outside the housing (e.g., see lubricant source 110 of FIG.
- a first inlet opening 64 may be provided on the housing 12 and connects to the first inlet 60
- a first outlet opening 66 may be provided on the housing 12 and connects to the outlet 62 .
- the first inlet opening 64 may be an external connection point on the housing 12 for receiving the lubricant from the source outside the housing 12 .
- the first inlet opening 64 may be provided on a plane that is perpendicular to the drive axis A-A of the drive shaft 24 .
- Lubricant may be directed into the housing 12 through the first inlet opening 64 in a generally parallel manner relative to the drive axis A-A.
- the first inlet opening 64 may be provided in and through the first cover plate 16 .
- the first inlet 60 may include a path that is formed in the housing 12 .
- the first outlet opening 66 may be an external connection point on the housing 12 to direct pressurized lubricant from the first outlet 62 of the first pump 20 , outside of the housing 12 , and to a system (e.g., transmission 102 ).
- the first outlet opening 66 may be provided on a plane that is parallel to the drive axis A-A of the drive shaft 24 .
- Lubricant may be directed out the housing 12 through the first outlet opening 66 in a generally perpendicular manner relative to the drive axis A-A.
- the first outlet opening 66 may be provided on the top side 26 of the housing 12 . As shown in FIG.
- the first outlet 62 may be a path or channel that is provided in a common wall (described in greater detail later) of the housing 12 and near a driven gear 48 and driven drive shaft 52 of the first pump 20 .
- the first outlet 62 may include a path that may be provided on or in an underside of the cover plate 16 .
- the second pump 30 includes a second inlet 68 (see FIG. 4B ) provided in the housing 12 for receiving lubricant from the source outside the housing and a second outlet 70 (shown in FIG. 4A ) for directing lubricant that is pressurized (by the second pump) out of the housing 12 .
- the second inlet 68 and the second outlet 70 are different than the first inlet 60 and the first outlet 62 . That is, the pump assembly 10 includes at least two distinct inlets 60 , 68 and two distinct outlets 62 , 70 .
- a second inlet opening 72 may be provided on the housing 12 and connects to the second inlet 68
- a second outlet opening 74 may be provided on the housing 12 and connects to the second outlet 70 .
- the second inlet opening 72 may be an external connection point on the housing 12 for receiving the lubricant from the source outside the housing 12 .
- the second inlet opening 72 may be provided on a plane that is parallel to the drive axis A-A of the drive shaft 24 .
- Lubricant may be directed into the housing 12 through the second inlet opening 72 in a generally perpendicular manner relative to the drive axis A-A. In one embodiment, such as shown in FIG.
- the second inlet opening 72 may be provided top side 26 of the housing 12 .
- the second inlet 68 of the second pump 30 may receive input lubricant from an inlet path 65 connected to the inlet opening 72 .
- the housing 12 may include a main inlet with an opening 76 provided in the housing 12 for receiving lubricant, that connects to this inlet path 65 for delivery to one or more of the pump inlets 60 , 68 (e.g., shown as being connected to the second inlet 68 ).
- the second outlet opening 74 may be an external connection point on the housing 12 to direct pressurized lubricant from the second outlet 70 of the second pump 30 , outside of the housing 12 , and to a system (e.g., transmission 102 ).
- the second outlet opening 74 may be provided on a plane that is parallel to the drive axis A-A of the drive shaft 24 .
- Lubricant may be directed out the housing 12 through the second outlet opening 74 in a generally perpendicular manner relative to the drive axis A-A.
- the second outlet opening 74 may be provided on the top side 26 of the housing 12 . As shown in FIG.
- the first outlet 70 may be a path or channel that is provided in a common wall (described in greater detail later) of the housing 12 and near a driven gear 58 of the second pump 30 .
- the first outlet 70 may include a path that may be provided on or in an underside of the cover plate 36 .
- the first outlet opening 66 and the second inlet opening 72 may be both provided on a plane that is parallel to the drive axis A-A of the drive shaft 24 .
- the first outlet opening 66 and the second inlet opening 72 may be provided on the same side of the housing 12 .
- the first outlet opening 66 and the second inlet opening 72 may be provided on the top side 26 of the housing 12 .
- the second outlet opening 74 may be provided on the same side of the housing 12 as the first outlet opening 66 and the second inlet opening 72 . That is, in accordance with an embodiment, such as shown in the Figures, the openings 66 , 72 , and 74 may be provided on the top side 26 of the pump assembly 10 .
- One or more seals 73 may be provided around or near the openings 66 , 72 , 74 to assist in sealing and securement.
- the seal 73 is a singularly molded seal with multiple openings designed for placement in a groove formed around the openings 66 , 72 , and 74 .
- the pump assembly 10 may also include in its housing 12 one or more openings therein that connect to the previously noted inlet path 65 .
- a main inlet may be provided in the housing 12 that directs input lubricant (e.g., from a source) into one or more of the pumps 20 and/or 30 . That is, this main inlet may fluidly connect to first inlet 60 and/or second inlet 68 .
- the main inlet has an inlet opening 76 provided in the housing 12 , such as shown in FIGS. 1, 4A, and 4B .
- the inlet opening 76 is provided on a plane that is perpendicular to the drive axis A-A of the drive shaft 24 .
- the inlet opening 76 is positioned on another side of the housing 12 that is traverse to the side of the housing containing the first outlet opening 66 , the second inlet opening 72 , and the second outlet opening 74 .
- the first inlet opening 64 and the inlet opening 76 are provided on the same side of the housing.
- the inlet opening 76 is positioned on the first side 14 of the pump assembly 10 .
- lubricant may be directed into the housing 12 through the inlet opening 76 in a generally parallel manner relative to the drive axis A-A.
- a passage or path 65 may be provided in housing 12 for feeding lubricant to the second inlet 68 via an opening 76 in the housing 12 .
- This inlet path 65 may be a formed or drilled path in the housing 12 that leads to the second inlet opening 72 and second inlet 68 of the second pump 30 , for example.
- the inlet path 65 is also or alternatively connected to the inlet 60 of the first pump 20 .
- This opening 78 may be provide for manufacturing purposes, for example.
- the opening 78 may include a plug 33 (e.g., made of steel) that is pressed therein to seal part of the inlet path 65 or passage within the housing 12 , when the assembly 10 is ready for use.
- the first pump 20 of the pump assembly 10 may be an external gear pump comprising a gearset of two externally toothed and intermeshed gears 46 , 48 provided on two parallel axes.
- the first gear 46 is a driving gear that is driven by the drive shaft 24 .
- the first gear 46 is configured and arranged to rotate about drive axis A-A.
- the first gear 46 may be connected to the second pump 30 via drive shaft 24 and configured to rotate with the drive shaft 24 .
- the first gear 46 may be provided on its own shaft 44 that is connected to drive shaft 24 (with or without coupling 25 ) (further described below).
- the second gear 48 a driven gear coupled to a rotatable shaft 52 provided on a driven axis B-B (see FIGS. 4A and 5 ). Driven axis B-B is parallel to drive axis A-A.
- the output from the first pump 20 may be selectively activated for pressurizing and pumping lubricant to the outside system (see, e.g., FIGS. 12-13 ).
- a valve such as valve 114 shown in FIG. 12
- the system may be designed to combine its outlet with a second pump (not shown).
- the outlet from the pump may be used just for lubrication as part of a lubrication circuit or just for cooling as part of a cooling circuit.
- the second pump 30 is a gerotor pump comprising an inner rotor 56 that acts as a driving gear and that is rotated relative to an outer rotor 58 .
- the inner rotor 56 is fixedly secured to the shaft 24 (or shaft 42 ) for rotation about axis A-A with the drive shaft 24 .
- the outer rotor 58 may be rotatably received in a part of the housing 12 (specifically, common wall 80 , as described below), according to one embodiment. In another embodiment, the outer rotor 58 is fixed within the common wall 80 .
- the inner rotor 56 meshes with the outer rotor 58 using teeth provided on each gear (e.g., inner rotor 56 has male teeth or external teeth provided along an outer periphery thereof, while outer rotor 58 has female receiving portions or internal teeth in an inner periphery thereof, for receipt of the male teeth of the inner rotor 56 ).
- the outer rotor 58 has greater number of teeth or portions than the inner rotor 56 .
- the axis of the inner rotor 56 is offset from the axis of the outer rotor 58 . In one embodiment, both rotors may rotate on their respective axes. Alternatively, in another embodiment, the inner rotor 56 rotates relative to the outer rotor 58 .
- rotation of the inner rotor 56 also rotates the outer rotor 58 via their intermeshed teeth to pressurize the input fluid received in areas between the complimentary parts for output from the pump assembly 10 , and thus such details are not described here.
- the offset of their axes creates a changing-volume space between them.
- fluid may enter a suction side of the gerotor, get pressurized due to the changing-volume space, and the pressurized fluid is discharged at a discharge port of the gerotor.
- the drive shaft 24 may be configured to drive the inner rotor 56 , for example. In an embodiment, such as shown in FIG.
- the outer rotor 58 may be provided (and rotated in) in a rotor pocket 54 , which forms part of one rotor chamber that is provided in the housing 12 .
- housing 12 is designed such that it provides two internal chambers therein; i.e., one internal chamber for the first (high pressure, external gear) pump 20 , and one internal chamber for the second (low pressure, gerotor) pump 30 .
- Each of these internal chambers receive and pressurize lubricant therein using respective pump parts.
- housing 12 includes a wall 80 that is common—also referred to as a “common wall” 80 in this disclosure—to both the first pump 20 and the second pump 30 of the pump assembly 10 , that forms part of each internal chamber.
- the common wall 80 may be positioned in a relatively radial direction (relative to the drive axis A-A) within the pump assembly 10 .
- the first pump 20 is provided on a first radial side 82 of the common wall 80 and the second pump 30 is provided on a second radial side 84 of the common wall 80 that is opposite to the first side.
- the drive shaft 24 extends through the common wall 80 and connects to each of the drive gear 46 and driving gear 56 of both the first pump 20 and the second pump 30 , respectively.
- the gears 46 , 48 of the first/external gear pump 20 may be provided on the first side 82 of the wall 80
- the inner and outer rotors 56 , 58 of the second/gerotor pump 30 may be provided on the second side 84 of the wall 80 .
- the common wall 80 forms at least part of each of the internal chambers provided in the pump assembly 10 , and the covers—either cover plate 16 or cover plate 36 —form the other part of each of the internal chambers.
- the common wall 80 may be a substantially flat wall that extends between the parts (e.g., gears) of the pumps 20 , 30 , in accordance with one embodiment. That is, each of the first and second sides of the wall 80 may be substantially flat.
- substantially flat refers to a side of the common wall that may be positioned flush with another portion (e.g., cover) of the pump assembly 10 , but that does not include pockets or chambers for receipt of pump parts therein.
- Such a substantially flat wall may include channels, paths, or routes that are drilled along a portion of the wall, however.
- the covers 16 and 36 may include pockets or openings on their inside radial walls that are sized to accommodate the gears of the pumps 20 , 30 therein.
- the inner radial walls of each of the covers 16 , 36 may form a peripheral wall that extends around and surrounds each internal chamber (and gears of the pumps 20 , 30 ) peripherally.
- the common wall 80 defines the pressurizing internal chambers in each of the pumps 20 , 30 , in which at least the drive gears 46 , 56 are received.
- the common wall 80 may include a first pocket 86 or first rotor chamber on the first side 82 thereof containing the at least one gear (e.g., drive gear 46 ) of the first pump 20 therein.
- a second pocket 54 or second rotor chamber may be provided on a second side 84 of the wall 80 containing the at least one gear (e.g., driving gear or inner rotor 56 ) of the second pump 30 therein.
- the common wall 80 may be positioned in a radial direction (relative to the drive axis A-A) and each of the pockets 54 , 86 may extend axially into and/or towards the wall 80 .
- the pockets 54 , 86 may be sized to receive at least one of the gears associated with each of the pump 20 , 30 .
- second pocket 54 may be sized in order to receive (and optionally allow rotation of) the outer rotor 58 of the gerotor pump 30 therein.
- first pocket 86 may be sized to receive and allow rotation of both the first and second gears 46 , 48 of the external gear pump 20 therein.
- the pocket 86 may be sized such that, when the gears 46 , 48 are installed in a meshing manner for rotation about their respective axes, a length of the pocket may be based on a length of the stacked or intermeshed gears.
- the walls of the pockets 86 , 54 may define axial sides of the internal chamber and include a peripheral wall 23 that extends around the gears peripherally to form the internal chambers.
- the covers 16 , 36 may be attached to the common wall 80 to help enclose the internal chambers along with the common wall 80 .
- the cover 36 is not shown in FIG. 3 , for example, so that some of the internal components of the second pump 30 can be seen.
- One or more seals 43 may be provided between the common wall 80 and covers 16 , 36 , for example. In an embodiment, a single seal 43 is provided around any openings or connection points therebetween in cover 16 , such as shown in FIG. 14 .
- the covers 16 , 36 may be made of any material, and may be formed by stamping (e.g., stamping steel or another metal), aluminum die casting, powdered metal forming, forging, or any other desired manufacturing technique.
- the cover 16 may also contain, in one embodiment, one or more grooves 53 A, 53 B (see FIG. 7 ) on its inside radial wall to accommodate ends of the drive shaft 24 / 44 and/or driven shaft 52 therein.
- an underside or an inner radial side (pump-facing side) of the cover plate 16 may have a recessed passage 61 to house seal 43 which separates the inlet 60 from the outlet on the backside of the spacer 50 or plate.
- an inner side (pump-facing side) of the cover plate 36 may include shadow ports for the inlet and outlet porting for the gear/gerotor set ( 56 and 58 ) of the second pump 30 .
- the underside or inner radial side of the cover plate 16 may be provided without a recessed passage 61 .
- the spacer 50 or pressure compensating plate may be provided on an opposite side of the external gearset, i.e., on an inner side at or in the pocket 86 , and/or at or near common wall 80 .
- first pocket 86 may be formed in the first side 82 of the common wall 80 to accept drive gear 46 and its shaft (drive shaft 24 and/or shaft 44 ) and a third pocket is also formed in the first side 82 of the wall 80 .
- the third pocket may be a separate pocket that is provided to contain the second/driven gear 48 of the first pump, and its rotating/driven shaft 52 , therein.
- a secondary pocket may be contained in either the first pocket 86 (when formed to contain a length of the intermeshed gears) or the third pocket for receiving an end of the driven shaft 52 of the external gear pump 20 .
- the common wall 80 may have one side that is substantially flat and an opposite side with one or more pockets therein.
- the flat side of the common wall 80 may be connected to a cover plate that has one or more pockets therein for receipt of at least one of the gears for one of the pumps, such that when the cover is connected with the flat side of the common wall 80 , the internal chamber is formed therein.
- the one or more pockets may be configured to receive one or more gears of the other of the pumps, and the cover plate may be attached thereto to form the additional internal chamber of the pump assembly 10 .
- the common wall 80 and/or housing 12 may be formed from any number of materials and manufactured in a number of ways.
- the common wall 80 is molded, e.g., injection molded.
- the common wall 80 may be formed via a molding process that further includes machining and/or drilling processes.
- the pockets 54 , 86 or rotor chambers may be machined into the common wall 80 .
- the common wall 80 may be formed via a casting process (die casting), powder metal forming, forging, stamping, or any other desired manufacturing technique.
- Other parts of the housing 12 may be formed by similar techniques, i.e., stamping, casting, powdered metal forming, molding, etc.
- the housing 12 and its common wall 80 may be formed using a casting technique.
- the housing 12 and wall 80 may be formed from die cast aluminum or cast iron.
- common wall 80 and the walls forming the pockets may be a single, unitary and continuous part, i.e., integral.
- the drive shaft 24 extends through the wall 80 and connects to each of the driving gears 56 , 46 contained in the first pocket 86 and the second pocket 54 , respectively.
- the driving gear of the external gear pump 20 is gear 46 , which is driven by the drive shaft 24 connected to the second pump 30
- the driven gear is gear 48 , which is coupled to rotatable shaft 52 .
- one or more spacers 50 , pressure compensation plates, or collars may be provided adjacent to the first and second gears 46 , 48 of the first pump 20 to substantially prevent sliding (axial) movement of the gears 46 , 48 from the wall 80 .
- the gears 46 , 48 may be placed such that one side is substantially flush with first side 82 of common wall 80 .
- Spacer(s) 50 , plate(s), or collar(s) may be placed on a side opposite to the first side 82 of the common wall 80 , and fitted on the shafts 44 , 52 between the gears 56 , 58 and the inner radial side of cover 16 . As shown in the exploded view of FIG.
- the spacer 50 may be a part of singular construction having openings 51 A, 51 B extending therethrough for receipt of the shafts 44 , 52 (respectively).
- the spacer(s) 50 or collar(s) limit the amount of wear and damage to the wall 80 , housing 12 and/or cover 16 .
- the drive shaft 24 that drives both the first pump 20 and the second pump 30 extends through the housing 12 , as shown in FIG. 4A .
- the common wall 80 may also have a receiving opening 88 that axially extends through the common wall 80 , extending between the second pocket 54 and first pocket 86 , for receipt of the drive shaft 24 therethrough.
- the size of the receiving opening 88 may be based on the diameter or size of the drive shaft 24 .
- the drive shaft 24 is a single, common drive shaft for both pumps 20 , 30 that is formed as a singular shaft (or tube) and is designed to extend through the housing 12 and into at least portion of the pumps 20 , 30 for driving them as it rotates about drive axis A-A. That is, the same shaft may directly drive first pump 20 and second pump 30 .
- the receiving opening 88 may have a substantially consistent diameter along its axial length from one end (e.g., at second pocket 54 ) to the other (e.g., at first pocket 86 ).
- the drive shaft 24 may be formed from a first drive shaft 42 and a second drive shaft 44 that are co-axially connected to one another for rotating together about the drive axis A-A.
- the first drive shaft 42 and the second drive shaft 44 are connected via a coupling 25 .
- the coupling 25 has a first extension end that is inserted into an opening in the drive shaft 42 , and a second end that has an opening therein for receiving an end of the first drive shaft 42 therein.
- the coupling 25 has an opening on either of its sides.
- the first drive shaft may include a connector 42 A on its end that is inserted (e.g., press-fit) into one opening of the coupling 25
- the second drive shaft may include a connector 44 A on its end that is inserted (e.g., press-fit) into the other opening of the coupling 25 .
- Such coupling 25 is optional and need not be provided.
- the illustrated couplings are exemplary only and not intended to be limiting.
- the shafts may be directly connected using a receiving portion and corresponding connector portion (e.g., male and female parts), thus forming a coupling therebetween.
- one of the drive shafts may include a connector male portion 42 A 1 that is inserted into a female receiving connector portion 42 A 2 of the other drive shaft (e.g., second drive shaft).
- An exemplary embodiment of such a coupling for the drive shaft(s) is shown in FIG. 27A and FIG. 27B .
- the receiving opening 88 may include additional step portions therein to accommodate shafts 42 and 44 and/or optional coupling 25 . That is, the receiving opening 88 may include multiple diameters along its axial length to accommodate parts associated with the drive shaft 24 .
- the drive shaft 24 is driven by a single input device or driver, which may be mechanical, electric, or electro-mechanical—e.g., an electric motor 90 , such as shown in FIGS. 8-10 and 11A-11C , an engine, an internal combustion engine (ICE), or a prime mover.
- a single input device or driver which may be mechanical, electric, or electro-mechanical—e.g., an electric motor 90 , such as shown in FIGS. 8-10 and 11A-11C , an engine, an internal combustion engine (ICE), or a prime mover.
- the pump assembly 10 is configured for assembly with an electric motor 90 .
- the pump assembly 10 and electric motor 90 are axially aligned on drive axis A-A.
- the electric motor 90 is contained in a casing 91 and has motor shaft 92 configured to drive the drive shaft 24 of the pump assembly 10 .
- the motor shaft 92 and drive shaft 24 may be a single shaft that extends from the motor 90 and into the pump assembly 10 .
- the electric motor 90 may have its own, separate motor drive shaft 92 configured to be driven about axis A-A, and still connected to the pump assembly 10 , in order to drive the pumps 20 , 30 in the pump assembly 10 .
- the motor shaft 92 has an end 94 that is configured connection to a connector portion 22 of the pump assembly 10 .
- the end 94 may be configured to be press-fit into an opening in the connector portion 22 for axial rotation along axis A-A.
- the connector portion 22 is provided on the second side 18 of the pump assembly 10 for connecting an input device or a driver (e.g., such a motor 90 shown in FIGS. 8-9 ).
- the connector portion 22 has a receiving area or opening 21 for receiving part of a driving shaft (motor shaft 92 ) of the driver therein.
- the connector portion 22 may be integrated into an end of the drive shaft 24 . That is, the drive shaft 24 may extend through the housing 12 and have one of its ends extending through (second) cover plate 36 on the second side 18 of the pump assembly 10 , such that it may be connected to the driver.
- the connector portion 22 may be a coupling that is attached to the end of the drive shaft 24 , and placed in or on the cover plate 36 when assembled.
- the casing 91 includes a sleeve 95 (see FIG. 10 ) to assist in securement of the motor 90 to the pump assembly 10 .
- the cover plate 36 provided on the second side 18 of the pump assembly 10 may include a cavity 37 on an outer radial side thereof configured to receive the sleeve 95 of the motor 90 therein when assembled together.
- the connector portion 22 is aligned with and inserted into an opening 97 of the sleeve 95 , while the outside of the sleeve 95 is provided in the cavity 37 .
- One or more seals 39 or O-rings may be provided around the connector portion 22 .
- the electric motor 90 may include a rotor 96 and a stator 98 (see FIG. 11A ) and a number of bearings 99 on provided on its motor shaft 92 .
- the rotor 96 is connected to the motor shaft 92 which is contained within its casing 91 along with the stator 98 .
- the motor casing 91 is generally cylindrical (see FIG. 11B ) and the stator 98 may be fixed thereto.
- the motor casing 91 may include cooling fins 93 provided on outer side thereof (i.e., the side opposite to that which the pump assembly 10 is attached).
- FIGS. 15-17 depict another embodiment of a pump assembly 10 A that includes first and second pumps 20 and 30 therein.
- like elements and components throughout FIGS. 15-17 are labeled with same designations and numbering as discussed with reference to FIGS. 1-14 .
- FIGS. 1-14 depict same designations and numbering as discussed with reference to FIGS. 1-14 .
- FIGS. 1-14 depicts various features associated with the pump assembly 10 of FIGS. 1-14 .
- the features shown in each of the individual figures is not meant to be limited solely to the illustrated embodiments. That is, the features described throughout this disclosure may be interchanged and/or used with other embodiments than those they are shown and/or described with reference to.
- Pump assembly 10 A may be driven by a driver such as motor 90 , for example.
- pump assembly 10 A includes first pump 20 and second pump 30 .
- Drive shaft 24 is provided in the housing configured to rotate about a drive axis A-A and drive both the first pump 20 and the second pump 30 .
- a coupling 25 may be optionally provided to connect drive shafts 42 and 44 to form the drive shaft 24 , or a single drive shaft may be provided.
- First pump 20 may be a high pressure external gear pump and second pump 30 may be a low pressure gerotor pump that are paired together and configured to be driven off the same drive shaft.
- the first pump 20 has a first inlet provided on the housing for receiving lubricant from a source outside the housing and a first outlet for directing lubricant that is pressurized out of the housing.
- the second pump has a second inlet provided on the housing for receiving lubricant from the source outside the housing and a second outlet for directing lubricant that is pressurized out of the housing.
- the second inlet and the second outlet are different than the first inlet and the first outlet, respectively.
- the housing further includes a common wall 80 to both the first pump 20 and the second pump 30 , which may be seen in FIG. 15 .
- the first pump 20 is provided on a first (right) side of the wall and the second pump 30 is provided on a second (left) side of the wall that is opposite to the first side.
- the drive shaft extends through the common wall 80 and connects to gears (e.g., gears 46 and 56 ) of both the first pump 20 and the second pump 30 .
- the underside or inner radial side (pump facing side) of the cover plate 16 may include receiving openings 17 therein (see FIGS. 15 and 17 ) for receipt of one end of each of the shafts 44 and 52 for the gears 46 and 48 of the first pump 20 .
- the spacer 50 or pressure compensating plate may be provided on an opposite side of the external gearset. That is, rather than being provided adjacent to the cover plate 16 as shown in FIG. 7 , the spacer 50 is provided on an inner (opposite) side, within the pocket 86 and/or at or near common wall 80 . As seen in FIG.
- the pocket 86 of common wall 80 may receive seal 43 A, spacer 50 and then the gears 46 , 48 therein, in accordance with an embodiment.
- Seal 43 A may be housed in the pocket 86 to separate the side of the spacer 50 or plate from direct contact with the common wall 80 while still providing support and/or pressure with respect to the external gearset of first pump 20 .
- Shaft 44 /drive shaft 24 extends through common wall 80 and is connected to the drive shaft 42 ( 24 ) of the gerotor gearset 56 , 58 which is contained in the other pocket 54 on the opposite side of the common wall 80 .
- FIGS. 18-28 depict yet another embodiment of a pump assembly 10 B that includes a single housing 12 having a common wall 80 and drive shaft 24 , and first and second pumps 20 B and 30 B therein.
- a pump assembly 10 B that includes a single housing 12 having a common wall 80 and drive shaft 24 , and first and second pumps 20 B and 30 B therein.
- like elements and components throughout FIGS. 18-28 are labeled with similar or same designations and numbering as discussed with reference to FIGS. 1-14 .
- FIGS. 1-14 depicts yet another embodiment of a pump assembly 10 B that includes a single housing 12 having a common wall 80 and drive shaft 24 , and first and second pumps 20 B and 30 B therein.
- like elements and components throughout FIGS. 18-28 are labeled with similar or same designations and numbering as discussed with reference to FIGS. 1-14 .
- FIGS. 1-14 the pump assembly 10 A of FIGS. 15-17 are similar to those features previously discussed.
- the features shown in each of the individual figures is
- Pump assembly 10 B may be driven by a driver such as motor 90 , for example, e.g., an electric motor, an engine, or a transmission.
- a driver such as motor 90
- pump assembly 10 B includes first pump 20 B and second pump 30 B.
- Drive shaft 24 is provided in the housing configured to rotate about a drive axis A-A and drive both the first pump 20 B and the second pump 30 B. In an embodiment, such as shown in FIG. 27A and FIG.
- the drive shaft 24 may be formed from a first drive shaft 42 and a second drive shaft 44 that are co-axially connected to one another for rotating together about the drive axis A-A.
- the first drive shaft 42 and the second drive shaft 44 are connected using a receiving portion in one end of a shaft (e.g., in drive shaft 44 , as shown in FIG. 27A ) and corresponding connector or insertion portion in another end of a shaft (e.g., in drive shaft 42 , as shown in FIG. 27A ) (e.g., male and female parts), thus forming a coupling therebetween.
- the first drive shaft 42 and the second drive shaft 44 may be connected via a separate coupling 25 , such as previously described with reference to the embodiments above.
- First pump 20 B in the illustrative embodiment of FIGS. 18-28 may be an air pump for pressurizing air
- second pump 30 B may be an oil pump or a lubricant pump configured to pressurize lubricant.
- the first pump 20 B and second pump 30 B of assembly 10 B are paired together and configured to be driven via the same drive shaft 24 .
- the first pump 20 B has a first inlet 60 A provided on the housing 12 and a first outlet 62 A (see FIG. 21 ) for directing air that is pressurized out of the housing 12 .
- the first pump 20 B may be connected to a closed network (e.g., brake booster system) and configured to receive air therefrom to evacuate the connected system.
- a closed network e.g., brake booster system
- the first inlet 60 A has a first inlet opening 64 A that is provided on a plane that is perpendicular to the drive axis A-A of the drive shaft 24 , in accordance with an embodiment.
- the first outlet 62 A has at least one first outlet opening 66 A. In the exemplary illustrated embodiment, the outlet 62 A includes two outlet openings 66 A.
- the second pump 30 B has a second inlet 68 (see FIG. 27A ) provided on the housing 12 for receiving lubricant from the source outside the housing and a second outlet 70 for directing lubricant that is pressurized out of the housing 12 .
- the second inlet 68 and the second outlet 70 are different than the first inlet 60 A and the first outlet 62 A, respectively.
- the second inlet 68 has a second inlet opening 72 .
- the first outlet opening(s) 66 A and the second inlet opening 72 are provided on the same side of the housing 12 , i.e., on the same side of the common wall 80 or an axis extending through the common wall 80 , such as shown in FIG. 23 .
- the second outlet 70 has a second outlet opening 74 .
- the second outlet 70 includes an outlet path 70 B that directs output/pressurized fluid to the second outlet opening 74 in the housing.
- the second outlet opening 74 is provided on the same side of the housing as the first inlet opening 64 A, i.e., on the same side of the common wall 80 , such as shown FIGS. 18 and 20 .
- the first inlet opening 64 A is provided on a plane that is parallel to the drive axis A-A of the drive shaft 24 .
- the second outlet opening 74 is provided on a plane that is parallel to the drive axis A-A of the drive shaft 24 .
- a passage or inlet path 65 may be provided in housing 12 for feeding lubricant to the second pump 30 B in the housing 12 .
- the second pump 30 B may receive input lubricant via an inlet path 65 connected to the second inlet opening 72 , as described in greater detail below.
- a lubricant source e.g., tank, sump
- the second inlet 68 and inlet opening 72 may be in fluid communication for directing input lubricant into and through the inlet path 65 or passage.
- This inlet path 65 may be a formed or drilled path in the housing 12 that leads to the second inlet 68 of the second pump 30 , for example, as well as the pumping elements (e.g., rotor, vanes) of the second pump 30 B.
- the inlet path 65 may be in the form of a tube, for example, in accordance with an embodiment.
- a screen or filter 81 may be provided between the main inlet opening 72 and inlet path 65 or passage/second inlet 68 before any lubricant enters the inlet path 65 within the housing 12 such that any particulates may be filtered from the input lubricant before being directed to the pumping elements of second pump 30 B.
- a shape (as shown here, e.g., a cone-shape) of the housing near inlet opening 72 may be designed to slow input fluid down before the filter 81 to reduce the pressure drop over the filter 81 . So the fluid is drawn in through second inlet opening 72 , may expand within the (cone-shaped) housing to slow down before it passes through filter 81 , and then travels through the inlet path 65 into the oil pump rotating group of second pump 30 B. More specifically, in accordance with an embodiment, the inlet opening 72 and housing is configured for placement within a source (e.g., sump of the engine) such that the inlet opening 72 sits within the lubricant (oil) and is at least somewhat submerged within the source of lubricant. Accordingly, the screen or filter 81 can filter any unwanted particulates that may be recirculated within the system during operation of the pump assembly 10 B.
- a source e.g., sump of the engine
- the second or main inlet opening 72 may be provided in the housing 12 to direct input lubricant (e.g., from a source) into pump 30 B. That is, this second inlet opening 72 may fluidly connect to inlet path 65 and thus second inlet 68 .
- the inlet opening 72 is provided on a plane that is perpendicular to the drive axis A-A of the drive shaft 24 .
- the inlet opening 72 is positioned on another side of the housing 12 as compared to the second pump 30 B, i.e., it positioned on a first side (e.g., right) of the common wall 80 (on the same side as first pump 20 B), while the second pump 30 B is positioned on the second, opposite side (e.g., left) of the common wall 80 .
- inlet path 65 connects the inlet opening 72 and second inlet 68 (such as shown in FIG. 27A ).
- the first inlet opening 64 A and the second inlet opening 72 are provided on the opposite sides of the housing.
- the second inlet opening 72 is positioned on the first side 14 of the pump assembly 10 .
- the housing 12 further includes a common wall 80 to both the first pump 20 B and the second pump 30 B, which is shown in FIG. 27A , for example.
- the first pump 20 B is provided on a first (right) side of the wall and the second pump 30 B is provided on a second (left) side of the wall that is opposite to the first side.
- the drive shaft 24 extends through the common wall 80 and connects to drive rotors (e.g., bearing 71 to rotor 48 A and rotor 56 A) of both the first pump 20 B and the second pump 30 B.
- the common wall 80 forms at least part of each of the internal chambers provided in the pump assembly 10 , and the covers—either cover plate 16 or cover plate 36 —form the other part of each of the internal chambers.
- the common wall 80 defines the pressurizing internal chambers in each of the pumps 20 B, 30 B, in which at least the rotors/gears 48 A, 56 A (and bearing 71 ) are received.
- the common wall 80 may include a first pocket 86 or first rotor chamber on the first side 82 thereof containing the bearing 71 and driven rotor 48 A of the first pump 20 therein.
- a second pocket 54 or second rotor chamber may be provided on a second side 84 of the wall 80 containing the at least one rotor (e.g., rotor 56 A) of the second pump 30 therein.
- the common wall 80 may be positioned in a radial direction (relative to the drive axis A-A) and each of the pockets 54 , 86 may extend axially into and/or towards the wall 80 .
- the pockets 54 , 86 may be sized to receive at least one of the rotors (or gears) associated with each of the pump 20 B, 30 B.
- second pocket 54 may be sized in order to receive the rotor 56 A and control slide 116 of a vane pump 30 therein; i.e., sized in order to allow and accommodate movement of the slide 116 relative to the internal wall of the pocket 54 .
- first pocket 86 may be sized to receive and allow eccentric rotation of driven rotor 48 A within pump 20 .
- the walls of the pockets 86 , 54 may define axial sides of the internal chamber and include a peripheral wall that extends around the rotors/gears peripherally to form the internal chambers.
- the covers 16 , 36 may be attached to the common wall 80 and/or housing 12 to help enclose the internal chambers along with the common wall 80 .
- the cover 36 is not shown in FIG. 24 , for example, so that some of the internal components of the second pump 30 B can be seen.
- the cover 16 is not shown in FIG. 25 , for example, so that some of the internal components of the first pump 20 B can be seen.
- One or more seals 43 may be provided between the common wall 80 and covers 16 , 36 , for example.
- a single seal 43 is provided around any openings or connection points therebetween in cover 16 , such as shown in FIG. 27A .
- the underside or inner radial side (pump facing side) of the cover plate 16 of the first pump 20 B may include a receiving opening 17 therein (see FIG. 26 ) for receipt of one end of the drive shaft 44 for the gears/bearing 71 /rotor 48 A of the first pump 20 B. More specifically, an end of the drive shaft may be press-fit into receiving opening 17 , and may or may not include a bushing. Also, as described later, the drive shaft 24 is received in a central bore of a stationary guide gear 46 A or sprocket, which acts as a bearing to support the end of the drive shaft.
- Shaft 44 /drive shaft 24 extends through common wall 80 and is connected to the drive shaft 42 ( 24 ) of the bearing 71 and thus rotor 48 A, which is contained in first pocket 86 (see FIGS. 25 and 27A ) on the opposite side of the common wall 80 .
- the drive shaft 24 or at least a portion thereof, is configured to extend through the cover plate 36 of the second pump 30 B.
- a connector portion 22 e.g., see FIG. 18
- the connector portion 22 may have a receiving area or opening 21 for receiving part of a driving shaft (motor shaft 92 ) of the driver therein.
- the first pump 20 B of the pump assembly 10 B may be an epitrochoidal vacuum pump, designed to produce epitrochoidal-like rotation of its rotor 48 A within the pocket 86 and housing 12 .
- An epitrochoid is defined as a geometric curve or plane curve that is generated by tracing motion of a fixed point on the radius (or extended radius) of a circle as it rolls on the outside/external portion of a fixed, base circle.
- the shape of the inner envelope of the epitrochoid determines or aids in generating the shape of the rotor (i.e., the shape of the outer edges or lobes of the rotor).
- a two lobed rotor 48 A is shown.
- the first pump 20 may be or include features of the epitrochoidal pump as disclosed in U.S. patent application Ser. No. 15/946,944, filed Apr. 6, 2018, which is hereby incorporated by reference in its entirety. Below some of the features of such an epitrochoidal pump are described.
- the first side of the wall or pocket 86 of the epitrochoidal first pump 20 B defines and is part of an internal space having an epitrochoidal shape.
- the rotor 48 A of the epitrochoidal vacuum pump is rotatably received within the internal space or pocket 86 .
- the rotor 48 A is shaped with a number of edges that conjugate with the epitrochoidal shape of the internal space and has an internally toothed guide gear portion 49 (see FIG. 25 ).
- the drive shaft 24 is configured to drive the eccentric bearing 71 to thus rotate the rotor 48 A eccentrically within the internal space or pocket 86 .
- the externally toothed guide gear 46 A (or sprocket) is connected to the drive shaft 24 for support while the rotor 48 A is driven by the drive shaft 24 .
- the first pump 20 B of pump assembly 10 B utilizes a two lobed rotor 48 A, one inlet 60 A, and at least one outlet 62 A provided in a housing 12 .
- the vacuum/first pump 20 B is illustrated with two outlet openings 66 A, that connect to passageways within the pump assembly, that form a single outlet 62 A of the pump 20 B.
- the openings 66 A may be positioned adjacent or next to each other to provide another channel and larger area for expulsion of air, effectively increasing the cross-sectional area of the outlet port. This may also assist in reducing resistance(s) during expulsion, for example.
- Reed valves 61 A see FIG.
- a second inlet port or inlet 77 may be a radially positioned inlet provided along the inlet path or inlet channel, the inlet channel being connected to inlet 60 A (radial relative to axis A-A) and configured to direct input air from inlet 60 to an internal inlet port within the pocket 86 .
- the inlet port 77 may also have a reed valve 77 A associated therewith.
- the inlet port 77 in the inlet path aids in preventing unwanted pressurization.
- the inlet port 77 is configured to provide protection against any potential consequences with regards to the pump spinning backwards or other unwelcome movement of the pump rotor or parts; that is, if the pump (i.e., rotor 48 A) were to run or spin backwards, e.g., to evacuate the chamber or pocket 86 , then inlet port 77 and reed valve 77 A may prevent unwanted pressurization and/or back metering of lubricant or oil in the pocket 86 , due to its close proximity to a check valve (e.g., associated with the engine) in the system.
- a check valve e.g., associated with the engine
- Pocket 86 acts as a single epitrochoidal working chamber and has a chamber volume. For each rotor revolution, each chamber fulfills two evacuation cycles. Accordingly, the total evacuation capacity per pump shaft rotation in the disclosed vacuum pump 10 A is defined as: single chamber volume ⁇ 1 (since there is one chamber) ⁇ 2 (evacuation cycles per rotor revolution)/2 (rotor speed reduction to shaft speed); therefore, the total evacuated capacity is 1*single chamber volume.
- the surrounding wall of the pocket 86 defines an internal space which is an epitrochoidally generated shape (not circular or substantially circular) and is flanked by cover 16 and common wall 80 .
- the rotor 48 A is rotatably received within the internal space of the chamber or pocket 86 .
- the chamber or pocket 86 is a single working chamber that is varied in size by the rotor 48 A as it rotates and orbitally revolves therein along the surrounding wall.
- each side surface of the rotor 48 A is brought closer to and then away from the wall of the pocket 86 , without fully contacting the wall (e.g., due to manufacturing clearances). Corners or apices of the rotor 48 A are guided along the wall in a sliding contact manner (e.g., via seals 75 ) during rotation of the rotor 48 A.
- the body of the rotor 48 A may have a substantially ovular shape, with two sides having convex, bow-shaped flanks (see, e.g., FIG. 25 ) forming its outer walls or edges, in accordance with an embodiment.
- Rotation of the rotor 48 A is performed eccentrically about axis A-A and is implemented by an internally toothed opening or portion 49 integrated in the rotor, an externally toothed guide sprocket 46 A, bearing 71 , and a drive shaft 24 ( 44 ).
- FIG. 26 shows an exploded view parts of the first pump 20 B, including bearing 71 , rotor 48 A, guide sprocket 46 A, and shaft 44 / 24 .
- the body of the rotor 48 A may have an opening in its center that is internally toothed for receipt of the guide sprocket 46 A therein.
- the central opening may be defined by a plurality of radially extending female teeth 49 on the interior thereof.
- the guide sprocket 46 A is received within the central opening.
- the guide sprocket 46 A may have a plurality of radially extending male teeth on the exterior thereof that mesh with and guide movement of the rotor 48 A, as the drive shaft is rotated.
- the drive shaft 24 ( 44 ) is designed to extend through the rotor 48 A towards cover 16 .
- An end of the drive shaft is received within a central hole of the guide sprocket 46 A and secured from rotating therein by a bushing, for example.
- An end of the drive shaft may be placed into the receiving opening 17 .
- an eccentric rotation bearing 71 is provided (see FIG. 26 ).
- a spacer is provided to axially locate the eccentric bearing 71 , e.g., during the press fitting of the pieces (i.e., drive shaft 44 , bearing 71 ) together. The spacer may reduce the size and weight of the eccentric bearing 71 to thereby improve balancing of the bearing.
- Eccentric rotation bearing 71 may have its own receiving opening for positioning of the drive shaft 44 therethrough.
- drive shaft 44 may include a stepped configuration of successively increasing diameters for assembly with the rotor 48 A.
- the aforementioned inlet 60 A may thus be a vacuum inlet for inputting air into the housing.
- the vacuum inlet 60 A includes an input channel or passageway that winds within the housing and receives (pulls via vacuum) air through. Air is communicated and drawn through the passageway and into at least one radial inlet port (not shown) provided in the surrounding wall of the pocket 86 . Accordingly, the inlet port 64 A fluidly connects to the inside of the chamber or pocket 86 . Inlet 60 A and its port 64 A selectively draws and delivers air under negative pressure (vacuum), dependent upon the position of the rotor 48 B.
- the second pump 30 B is a vane pump comprising an inner rotor 56 A and a control slide 116 (see FIGS. 24 and 28 ) having a rotor receiving space 118 communicated to the second inlet 68 and the second outlet 70 .
- the control slide 116 (also referred to as a control ring in the art) is mounted in the housing 12 for pivotal movement in opposing displacement increasing and displacement decreasing directions. As illustrated in FIGS. 24 and 28 , the control slide 116 has a pivotal connection established by a pivot pin 122 . The control slide 116 pivots about that pivotal connection/pin 122 in the displacement increasing and displacement decreasing directions, dependent upon the pressurized fluid therein, during operation of the pump.
- the rotor receiving space 118 may be an essentially cylindrical bore extending through the thickness of the control slide body, as illustrated; i.e., the control slide 116 has an inside or inner surface defining rotor receiving space 118 .
- This rotor receiving space 118 communicates directly with the inlet and outlet 65 , 70 for drawing in oil, lubricant, or another fluid under negative intake pressure through the inlet 65 , and expelling the same under positive discharge pressure out the outlet 70 .
- the rotor 56 A of the second pump 30 B is provided in the rotor receiving space 118 , as shown in FIG. 28 .
- the rotor 56 A is configured for rotation within and relative to the control slide 116 .
- the rotor 56 A has a central axis that is typically eccentric to a central axis of the control slide 116 (and/or rotor receiving space 118 ).
- the rotor 56 A is fixedly secured to the shaft 24 (or shaft 42 ) for rotation about axis A-A with the drive shaft 24 .
- the rotor 56 A comprises a plurality of vanes 120 .
- the vanes 120 may be retractable and optionally have springs or other features (e.g., fluid channels) for biasing the vanes 120 radially outwardly for contact with the inner surface of the rotor receiving space 118 .
- the rotor 56 A is rotatably mounted in the rotor receiving space 118 (clockwise in the orientation shown in FIG. 28 ) to draw lubricant (e.g., from a source, such as a lubricant sump (e.g., an oil sump) or from generally within an enclosed space (e.g., from within a transmission housing) under negative pressure into the rotor receiving space 118 via the inlet 68 and discharge the lubricant from the rotor receiving space 118 via the outlet 70 under positive pressure.
- the outlet 70 generally expels the lubricant under positive pressure to the device requiring lubrication, such as to the oil gallery of an engine.
- the rotor 56 A may be powered in any manner.
- the rotor 56 A is often coupled to a gear or pulley driven by a belt or chain, or may be directly driven by another element of the drive train.
- the pump 30 B may be driven by an electric motor (particularly in electrically powered vehicles) or have two input connections so as to be driven by both an engine driven element and/or an electric motor (particularly in hybrid vehicles).
- the manner in which the rotor 56 A is driven is not limiting and may occur in any manner.
- a resilient structure 124 is positioned between the housing 12 or pocket 54 and the control slide 116 to bias the control slide 116 in the displacement increasing direction.
- the resilient structure 124 is a compression spring, but it may have any structure or configuration.
- the control slide 116 includes a radial projection 126 (or radially extending bearing structure) opposite the pivotal connection, e.g., pin 122 , of the control slide 116 to the housing 12 .
- the radial projection 126 has a bearing surface 128 that is engaged by the resilient structure 124 .
- one end of the spring/structure 124 engages that surface 128 , and an opposite end thereof engages against an opposing surface provided in the pocket 54 or housing 12 .
- the spring 124 as illustrated is, held in compression between those surfaces thus applying a reaction force biasing the control slide 116 in the displacement increasing direction.
- the control slide 116 may have one or more seals 132 which define a control chamber 130 between the control slide 116 and the pocket 54 /housing 12 .
- the control chamber 130 is communicated with a source of the pressurized lubricant to move the control slide 116 in the displacement decreasing direction.
- lubricant is fed into the control chamber 130 via inlet path 65 and a pocket/chamber inlet port 65 A.
- the inlet and outlet 30 , 40 are disposed on opposing radial sides of the rotational axis of the rotor 65 A.
- the housing 12 has at least one inlet port 65 A for intaking fluid to be pumped from inlet 65 , and at least one outlet port 70 A for discharging the fluid to outlet 70 .
- the inlet port 65 A and outlet port 70 A each may have a crescent shape, and may be formed through the same wall located on one axial side or both axial sides of the housing (with regard to the rotational axis of the rotor).
- the inlet and outlet ports 65 A, 70 A may be disposed on opposing radial sides of the rotational axis of the rotor 16 .
- These structures are conventional, and need not be described in detail.
- the shape of the inlet and/or outlet is not intended to be limiting. Other configurations may be used, such as differently shaped or numbered ports, etc. Further, it should be understood that more than one inlet or outlet may be provided (e.g., via multiple ports).
- the chamber inlet port 65 A may be communicated (directly or indirectly) to chamber outlet port 70 A, through outlet path 70 B and to second outlet 70 of the housing 12 , and thus the source of pressurized lubricant for the control chamber 130 is the lubricant discharged from the outlet 70 .
- This is a known feedback approach wherein the pressure from the outlet 70 is used to help regulate the pump's displacement and pressure. As the pressure fed back from the outlet 70 increases, that will result in a pressure increase in the control chamber 130 , which in turn moves the control slide 116 in the displacement decreasing direction against the bias of the resilient structure 124 (and that in turn will also decrease the pressure differential generated by vanes 120 and thus the pressure of the lubricant discharged from the outlet 70 ).
- the second pump 30 B may have multiple control chambers for providing different levels of control over the operation of the pump assembly 10 B, in accordance with embodiments. In other embodiments, the pump 30 B may have only one control chamber.
- the second pump 30 B may also include several safety features associated therewith.
- one or more fail-safe pressure relief valves 140 e.g., ball valves, check valves, panic valves
- Such valves may be positioned in the inlet path or outlet path of the pump assembly 10 B.
- the second pump 30 B may include one or more valves as disclosed in U.S. Pat. Nos. 9,534,519, 9,771,935, 10,030,656, and 10,247,187, and U.S. Provisional Ser. No. 62/799,449 filed Jan. 31, 2019, each of which is hereby incorporated by reference in its entirety.
- second pump 30 B may be a gerotor pump (such as shown and described previously with reference to FIG. 3 ) provided in the same housing and pump assembly as epitrochoidal pump 20 B.
- the exemplary embodiment as shown in FIGS. 18-28 provides a more compact packaging option for including air and lubricant pumps in a single housing assembly. Such a design reduces connection parts required to connect to the engine. It also allows for use of a common drive shaft to operate said pumps therein.
- FIGS. 12 and 13 are described with reference to pump assembly 10 , it should be understood that pump assembly 10 A may operate and be used in a similar manner as pump assembly 10 .
- the second (low pressure, gerotor) pump 30 is configured to always provide lubrication to a transmission (see transmission 102 in FIG. 13 ) as the motor 90 is turning.
- a flow restrictor may optionally be provided (e.g., outside of the pump assembly, or built into the pump assembly or well, if desired) to restrict the amount of lubricant to the transmission.
- a controller 104 shown in FIG.
- the second pump 30 is configured to operate or drive the electric motor 90 (e.g., control a magnetic field of the stator 98 of the motor 90 ), to thus control and drive the pump assembly 10 .
- the second pump 30 may also be configured to selectively flow lubricant through to a cooling system of the transmission, e.g., if cooling is required, via operation of a control valve 112 .
- the controller 104 may control movement of the valve 112 to an open position for feeding to the cooling system, for example.
- a flow restrictor may also (or alternatively) be provided (e.g., outside of the pump assembly) to restrict the amount of lubricant to the cooling system. In some instances, the same flow restrictor may be provided before the inlets for lubricating and cooling the transmission.
- the operating pressure for the second pump 30 may be up to approximately 3.0 bar.
- the first (high pressure, external gear) pump 20 is not stationary.
- the first pump 20 is also configured to rotate with operation of the motor 90 , due to the connecting drive shaft 24 between the two pumps 20 and 30 .
- output from the first pump 20 is generally limited in operating conditions, e.g., at approximately 3.0 bar.
- the first pump 20 is selectively activated. That is, first pump 20 may be activated to output higher pressurized lubricant to the transmission.
- the first pump 20 is configured for use to output lubricant to the clutch 108 /transmission when a desired operational pressure of the lubricant is greater than approximately 20 bar. In one embodiment, the first pump 20 is configured to operate when the desired pressure for the outside system/transmission 102 is in a range of approximately 20 bar to approximately 60 bar (both inclusive).
- control valve 114 shown schematically in FIG. 12 , is provided to selectively limit (or selectively allow) output from the first pump 20 to the clutch 108 /transmission 102 .
- the valve 114 in its first position, the valve 114 may be configured to direct output pressurized fluid from first outlet opening 62 to the clutch 108 . Otherwise, at lower pressures (i.e., less than 20 bar), the valve 114 may be configured to be provided in a second position, such that the first pump 20 recirculates the lubricant back to the tank 106 , as shown in FIG. 12 .
- the output from the first pump 20 may be designed to assist the second pump 30 in lubricating the transmission at the low pressure.
- the controller 104 is further configured to control the selective activation of the valve 114 and thus use of the output from the first pump 20 .
- the first epitrochoidal pump 20 B may be used provide a vacuum, i.e., negative pressure or air, to any number of systems in a vehicle, e.g., a brake booster system, pneumatic actuators, and/or valves.
- the second vane pump 30 B may be used as an oil pump to supply pressurized lubricant to another system, e.g., to act as a booster for a circuit to an engine or transmission, to provide lubricant and/or cooling to a gearbox, to assist in clutch operation, and/or another smaller pump within a vehicle.
- the pump assemblies 10 and 10 A and 10 B as disclosed herein provides several features and improvements, including that both pumps ( 20 , 30 ) provided in the assemblies 10 and 10 A and 10 B are integrated and contained in one housing and share a common wall 80 in that housing, thereby allowing for a more compact configuration and construction. As such, a larger space needed for mounting the disclosed pump assembly is not necessary. Further, fabrication and machining costs for forming the housing 12 are reduced. Additionally, both pumps ( 20 , 30 ) are driven via the same shaft 24 (whether of singular or connected construction) in the housing 12 .
- the output from the first pump may be limited.
- the pump assembly 10 and/or 10 A and/or 10 B may operate under a range of operating conditions or stages, including selective use of a high pressure/first pump when required.
Abstract
Description
- This application claims priority to U.S. Provisional Patent Application No. 62/786,961, filed Dec. 31, 2018, which is hereby incorporated by reference herein in its entirety.
- The present disclosure is generally related to a two stage pump assembly that includes a first pump and a second pump containing in a single housing.
- Dual pump systems that include more than one pump are generally known in the art. In some cases, these systems are designed to use one pump in certain circumstances, and another, different pump in other circumstances. U.S. Publication No. 20170058895 and U.S. Pat. No. 4,519,755 provide examples of these type of systems that use a second pump for pumping in certain circumstances. In some cases, the output of the pump is variable. See, e.g., U.S. Publication Nos. 20090041593 and 20110129359 for such examples of varying output from a pump.
- It is an aspect of this disclosure to provide a two stage pump assembly. The assembly includes: a first pump and a second pump for pumping lubricant, both the first pump and the second pump being integrated into a single housing and each configured to pressurize lubricant input into the housing. A drive shaft is provided in the housing configured to rotate about a drive axis and drive both the first pump and the second pump. The drive shaft is driven by a single input device. Both the first pump and the second pump have at least one gear configured and arranged to be rotated by the drive shaft. The first pump has a first inlet provided on the housing for receiving lubricant from a source outside the housing and a first outlet for directing lubricant that is pressurized out of the housing. The second pump has a second inlet provided on the housing for receiving lubricant from the source outside the housing and a second outlet for directing lubricant that is pressurized out of the housing. The second inlet and the second outlet are different than the first inlet and the first outlet, respectively. The housing further includes a wall that is common (or common wall) to both the first pump and the second pump, the first pump being provided on a first side of the wall and the second pump being provided on a second side of the wall that is opposite to the first side. The drive shaft extends through the wall and connects to each of the at least one gears of both the first pump and the second pump.
- Another aspect of this disclosure provides the above noted two stage pump assembly with a transmission (or other system designed to receive pressurized lubricant from the pump assembly). The second pump is configured to continuously pump the lubricant to the transmission/system. In an embodiment, the transmission comprises a clutch system that selectively receives lubricant pumped from the first pump. A control valve may be provided for limiting the lubricant that is output from the first pump to the clutch system of the transmission.
- Other features, improvements, and advantages of the present disclosure will become apparent from the following detailed description, the accompanying drawings, and the appended claims.
-
FIG. 1 is a perspective view of a pump assembly from a first side thereof in accordance with an embodiment of the present disclosure. -
FIG. 2 is a perspective view of the pump assembly ofFIG. 1 from a second side thereof. -
FIG. 3 is an alternate perspective view of the pump assembly ofFIG. 2 with a second cover removed therefrom, showing a portion of a second pump in the assembly, in accordance with an embodiment. -
FIG. 4A is a cross sectional view through line 4-4 ofFIG. 3 , showing parts of the housing, the second pump and a first pump contained in the pump assembly, in accordance with an embodiment. -
FIG. 4B is an alternate cross sectional view through the housing shown inFIG. 3 , showing another view of parts within the housing. -
FIG. 4C is a cross sectional view through the first pump showing an inlet and outlet thereof, in accordance with an embodiment. -
FIG. 5 shows a connection and drive shaft of the first and second pumps, and a first cover, of the pump assembly in accordance with an embodiment. -
FIG. 6 shows an exploded view of the parts shown inFIG. 5 , without the first cover. -
FIG. 7 shows an exploded view of the pump assembly ofFIG. 1 . -
FIGS. 8 and 9 show perspective views of the pump assembly ofFIG. 1 connected with a driver in accordance with an embodiment. -
FIG. 10 shows an exploded view of the parts shown inFIGS. 8 and 9 . -
FIG. 11A shows a cross sectional view of the pump assembly and driver as shown inFIGS. 8 and 9 , in accordance with an embodiment. -
FIGS. 11B and 11C show a front perspective view and a back perspective view, respectively, of the driver including cooling fins, in accordance with an embodiment. -
FIG. 12 is a schematic drawing showing options for operating the herein disclosed pump assembly for pumping lubricant to a transmission. -
FIG. 13 is a is a schematic drawing of a system including the pump assembly as disclosed herein. -
FIG. 14 is an underside view of a cover of one of the pumps in the pump assembly disclosed herein, including a seal. -
FIG. 15 is a cross sectional view through a housing of a pump assembly, in accordance with another embodiment of this disclosure, having a first pump and a second pump therein. -
FIGS. 16 and 17 show exploded, perspective views of parts of the pump assembly ofFIG. 15 from a first side and a second side, respectively. -
FIG. 18 is a perspective view of a pump assembly from a first side thereof in accordance with yet another embodiment of the present disclosure, having a first pump and a second pump therein. -
FIG. 19 is a perspective view of the pump assembly ofFIG. 18 from a second side thereof. -
FIG. 20 is a top view of the pump assembly ofFIG. 18 . -
FIG. 21 is a bottom view of the pump assembly ofFIG. 18 . -
FIG. 22 is a first side view of the pump assembly ofFIG. 18 . -
FIG. 23 is a second side view of the pump assembly ofFIG. 18 . -
FIG. 24 is an alternate perspective view of the pump assembly ofFIG. 18 with a second cover removed therefrom, showing a portion of a second pump in the assembly, in accordance with an embodiment. -
FIG. 25 is an alternate perspective view from the second side of the pump assembly ofFIG. 19 with a first cover removed therefrom, showing a portion of a first pump in the assembly, in accordance with an embodiment. -
FIG. 26 shows an exploded view of parts of the pump assembly as shown inFIGS. 18 and 19 . -
FIG. 27A is a cross sectional view of the pump assembly as shown inFIGS. 18 and 19 , in accordance with an embodiment, andFIG. 27B is an alternate view ofFIG. 27A showing details of the drive shaft of the pump assembly. -
FIG. 28 is a full side view of the second pump in the assembly as shown inFIG. 24 , with the second cover removed therefrom, in accordance with an embodiment. - The pump assembly described herein contains multiple pumps within in a single housing or block. Each pump is provided with distinct inlets and outlets that allow for selective output from one of the pumps, while the other pump regularly or continuously supplies/outputs pressurized lubricant to a system (e.g., transmission or engine) during operation. A common wall is provided in the housing, between parts of the two pumps, and forms part of the internal chambers for each pump.
- In accordance with an embodiment, the herein disclosed pump assembly includes a low pressure pump and high pressure pump (that is, two stages of pressure) that are configured to be driven off the same drive shaft. In accordance with one embodiment, the herein disclosed pump assembly includes a low pressure gerotor pump and a pressure-compensated, high pressure external gear pump that are paired together and configured to be driven off the same drive shaft.
- While there are parts and features of the
pump assembly 10 herein referenced as top, bottom, left, right, upper, lower, first, second, etc., it should be noted that such terms are not at all intended to be limiting with respect to direction, mounting, or positioning of thehousing 12 and/or pumpassembly 10 described herein. Such terms are provided for reference only. -
FIGS. 1 and 2 illustrate perspective views from two sides of a two-stage pump assembly 10 in accordance with this disclosure. Thepump assembly 10 is used to pressurize and pump lubricant to an outside system such as a transmission (e.g., seetransmission 102 ofFIG. 13 ) or an engine. In this disclosure, “lubricant” refers to fluids such as transmission fluid or (engine) oil that may be pressurized and directed to a system, e.g., for cooling and lubrication purposes. For explanatory purposes only, this disclosure describes the fluid as transmission fluid used with a transmission. However, this design may be used with engine oil and an engine as well. - In accordance with an embodiment, the “two-stages” addressed by the disclosed pump assembly refer to the
pump assembly 10 being able to provide two stages of pressure levels, i.e., a first, higher pressure and a second, lower pressure. That is, in some embodiments, afirst pump 20 and asecond pump 30 are provided for pumping lubricant (e.g., oil); each pump is configured to pressurize lubricant input into the housing. In the illustrated embodiments, thefirst pump 20 and thesecond pump 30 are co-axially aligned and driven using a driver (e.g., a motor or engine). - More specifically, in accordance with an embodiment, the disclosed
assembly 10 includes, integrated into asingle housing 12, the first pump 20 (seeFIG. 4A ) that is a “high pressure” pump designed for selective output operation, i.e., when higher pressurized lubricant is required by the outside system, and the second pump 30 (also shown inFIG. 4A ) that is a “low pressure” pump designed for continuously pumping lower pressurized lubricant to the system. Generally thesecond pump 30 continuously outputs pressurized lubricant as thepump assembly 10 is operated, while the output from thefirst pump 20 is limited. Further details regarding the high and low pressure ranges addressed by thepump assembly 100 are described later. In another embodiment, thepump assembly 10B comprises a tandem pump assembly having, integrated into asingle housing 12 and with a common drive shaft and common wall (seeFIGS. 27A-B ), afirst pump 20B (seeFIGS. 20 and 26 ) for pumping air and asecond pump 30B (also shown inFIGS. 20 and 26 ) for pumping lubricant or fluid to a system. Further details regarding thetandem pump assembly 10B are also described further below. - A
drive shaft 24 is provided in thehousing 12 and is configured to rotate about a drive axis A-A. Thedrive shaft 24 drives both thefirst pump 20 and thesecond pump 30. Both thefirst pump 20 and thesecond pump 30 have at least one gear that is configured and arranged to be rotated by thedrive shaft 24. Thedrive shaft 24 may directly or indirectly rotate each of these gears about axis A-A. In the illustrated embodiment, as shown and described later with reference toFIG. 4A , for example,gear 46 offirst pump 20 andgear 56 ofsecond pump 30 may be the gears that are driven by thedrive shaft 24. - The
housing 12 of thepump assembly 10 includes a first side 14 (seeFIG. 1 ) with a (first) cover plate 16 (covering parts of one of the pumps therein) and a second side 18 (seeFIG. 2 ) with a (second) cover plate 36 (covering parts of the other pump therein). In one embodiment,first cover plate 16 is associated with thefirst pump 20 is a fixed cover plate designed for axial clearance pressure using pump pressure. Thefirst cover plate 16 may be secured to thehousing 12, and thus is not floating. Thecover plate 16 may be removably secured tofirst side 14 ofhousing 12 via one or more fasteners 38 (e.g., bolts, that extend through corresponding openings within the housing) (seeFIG. 1 ), in accordance with an embodiment. In an embodiment, a pressure compensation plate orspacer 50 inside the cover is configured to float in thehousing 12 and is loaded into a gearset (e.g., gears 46, 48, which are described later below) by a seal (e.g., seal 43), and then by pressure on the cover side of the plate. Thecover plate 36 may be removably secured tosecond side 18 ofhousing 12 via one or more fasteners 40 (e.g., bolts, that extend through corresponding openings within the housing) (seeFIG. 2 ). - Optionally, in an embodiment, the
housing 12 may include openings or cutouts therein, such as indicated at 27 inFIGS. 1 and 2 , which act as weight saving areas within the housing. That is, the weight savingcutout portions 27 inhousing 12 are designed to reduce the overall weight of thepump assembly 10. Optionally, in an embodiment, thehousing 12 may include locatingdowels 29 that are inserted into corresponding openings in thehousing 12 and covers 36 and/or 16, in order to assist in placement and securement of the covers to the housing. Thedowels 29 may be cylindrically shaped and hollow, in accordance with one embodiment. Further, one or more bolt holes 31 may be provided in the housing for receipt of fasteners/bolts therein, in order to secure the covers and/or additional parts to thehousing 12. - The
housing 12 further includes a top side 26 (shown on top inFIGS. 1, 2, and 8 ), a bottom side 28 (shown on bottom inFIGS. 4A and 8 ), a front side 32 (shown on the right inFIG. 1 ) and a back side 34 (shown on the right inFIG. 2 ). In the illustrated embodiment, thefirst side 14, thetop side 26, and thefront side 32 may include inlet and outlet openings for each of thepumps housing 12. For example, in one embodiment, thefirst pump 20 may include a first inlet 60 (seeFIG. 4C ) provided in or on thehousing 12 for receiving lubricant from a source outside the housing (e.g., seelubricant source 110 ofFIG. 13 ) and a first outlet 62 (seeFIG. 4C ) for directing lubricant that is pressurized (by the first pump) out of thehousing 12. A first inlet opening 64 (seeFIG. 1 ) may be provided on thehousing 12 and connects to thefirst inlet 60, and a first outlet opening 66 may be provided on thehousing 12 and connects to the outlet 62. The first inlet opening 64 may be an external connection point on thehousing 12 for receiving the lubricant from the source outside thehousing 12. In an embodiment, the first inlet opening 64 may be provided on a plane that is perpendicular to the drive axis A-A of thedrive shaft 24. Lubricant may be directed into thehousing 12 through the first inlet opening 64 in a generally parallel manner relative to the drive axis A-A. In one embodiment, such as shown inFIG. 1 , the first inlet opening 64 may be provided in and through thefirst cover plate 16. As shown inFIG. 4A , a path that may be provided on or in an underside of thecover plate 16 tofirst inlet 60. In another embodiment, thefirst inlet 60 may include a path that is formed in thehousing 12. - The first outlet opening 66 may be an external connection point on the
housing 12 to direct pressurized lubricant from the first outlet 62 of thefirst pump 20, outside of thehousing 12, and to a system (e.g., transmission 102). In an embodiment, the first outlet opening 66 may be provided on a plane that is parallel to the drive axis A-A of thedrive shaft 24. Lubricant may be directed out thehousing 12 through the first outlet opening 66 in a generally perpendicular manner relative to the drive axis A-A. In one embodiment, the first outlet opening 66 may be provided on thetop side 26 of thehousing 12. As shown inFIG. 4A , the first outlet 62 may be a path or channel that is provided in a common wall (described in greater detail later) of thehousing 12 and near a drivengear 48 and drivendrive shaft 52 of thefirst pump 20. In another embodiment, the first outlet 62 may include a path that may be provided on or in an underside of thecover plate 16. - Also, in one embodiment, the
second pump 30 includes a second inlet 68 (seeFIG. 4B ) provided in thehousing 12 for receiving lubricant from the source outside the housing and a second outlet 70 (shown inFIG. 4A ) for directing lubricant that is pressurized (by the second pump) out of thehousing 12. Thesecond inlet 68 and thesecond outlet 70 are different than thefirst inlet 60 and the first outlet 62. That is, thepump assembly 10 includes at least twodistinct inlets distinct outlets 62, 70. - A second inlet opening 72 (see
FIG. 1 ) may be provided on thehousing 12 and connects to thesecond inlet 68, and a second outlet opening 74 may be provided on thehousing 12 and connects to thesecond outlet 70. The second inlet opening 72 may be an external connection point on thehousing 12 for receiving the lubricant from the source outside thehousing 12. In an embodiment, the second inlet opening 72 may be provided on a plane that is parallel to the drive axis A-A of thedrive shaft 24. Lubricant may be directed into thehousing 12 through the second inlet opening 72 in a generally perpendicular manner relative to the drive axis A-A. In one embodiment, such as shown inFIG. 1 , the second inlet opening 72 may be providedtop side 26 of thehousing 12. As shown inFIG. 4B , thesecond inlet 68 of thesecond pump 30 may receive input lubricant from aninlet path 65 connected to theinlet opening 72. As described in greater detail below, thehousing 12 may include a main inlet with anopening 76 provided in thehousing 12 for receiving lubricant, that connects to thisinlet path 65 for delivery to one or more of thepump inlets 60, 68 (e.g., shown as being connected to the second inlet 68). - The second outlet opening 74 may be an external connection point on the
housing 12 to direct pressurized lubricant from thesecond outlet 70 of thesecond pump 30, outside of thehousing 12, and to a system (e.g., transmission 102). In an embodiment, the second outlet opening 74 may be provided on a plane that is parallel to the drive axis A-A of thedrive shaft 24. Lubricant may be directed out thehousing 12 through the second outlet opening 74 in a generally perpendicular manner relative to the drive axis A-A. In one embodiment, the second outlet opening 74 may be provided on thetop side 26 of thehousing 12. As shown inFIG. 4A , thefirst outlet 70 may be a path or channel that is provided in a common wall (described in greater detail later) of thehousing 12 and near a drivengear 58 of thesecond pump 30. In an embodiment, thefirst outlet 70 may include a path that may be provided on or in an underside of thecover plate 36. - In an embodiment, the
first outlet opening 66 and the second inlet opening 72 may be both provided on a plane that is parallel to the drive axis A-A of thedrive shaft 24. In an embodiment, thefirst outlet opening 66 and the second inlet opening 72 may be provided on the same side of thehousing 12. In one embodiment, thefirst outlet opening 66 and the second inlet opening 72 may be provided on thetop side 26 of thehousing 12. In yet another embodiment, the second outlet opening 74 may be provided on the same side of thehousing 12 as thefirst outlet opening 66 and the second inlet opening 72. That is, in accordance with an embodiment, such as shown in the Figures, theopenings top side 26 of thepump assembly 10. - One or
more seals 73 may be provided around or near theopenings FIG. 7 , theseal 73 is a singularly molded seal with multiple openings designed for placement in a groove formed around theopenings - The
pump assembly 10 may also include in itshousing 12 one or more openings therein that connect to the previously notedinlet path 65. In an embodiment, a main inlet may be provided in thehousing 12 that directs input lubricant (e.g., from a source) into one or more of thepumps 20 and/or 30. That is, this main inlet may fluidly connect tofirst inlet 60 and/orsecond inlet 68. The main inlet has aninlet opening 76 provided in thehousing 12, such as shown inFIGS. 1, 4A, and 4B . In an embodiment, theinlet opening 76 is provided on a plane that is perpendicular to the drive axis A-A of thedrive shaft 24. In one embodiment, theinlet opening 76 is positioned on another side of thehousing 12 that is traverse to the side of the housing containing the first outlet opening 66, the second inlet opening 72, and the second outlet opening 74. In an embodiment, the first inlet opening 64 and theinlet opening 76 are provided on the same side of the housing. In an embodiment, theinlet opening 76 is positioned on thefirst side 14 of thepump assembly 10. In a similar manner to the first inlet opening 64, lubricant may be directed into thehousing 12 through the inlet opening 76 in a generally parallel manner relative to the drive axis A-A. - In an embodiment, illustrated in
FIG. 1 , a passage orpath 65 may be provided inhousing 12 for feeding lubricant to thesecond inlet 68 via anopening 76 in thehousing 12. Thisinlet path 65 may be a formed or drilled path in thehousing 12 that leads to the second inlet opening 72 andsecond inlet 68 of thesecond pump 30, for example. In an embodiment, although not explicitly illustrated in the Figures, theinlet path 65 is also or alternatively connected to theinlet 60 of thefirst pump 20. In an embodiment, illustrated in the cross sectional view ofFIG. 4B , there may be another opening 78 connected toinlet path 65. Thisopening 78 may be provide for manufacturing purposes, for example. As shown inFIGS. 4A and 4B , theopening 78 may include a plug 33 (e.g., made of steel) that is pressed therein to seal part of theinlet path 65 or passage within thehousing 12, when theassembly 10 is ready for use. - Referring now more specifically to each of the pumps, in one embodiment, the
first pump 20 of thepump assembly 10 may be an external gear pump comprising a gearset of two externally toothed and intermeshedgears first gear 46 is a driving gear that is driven by thedrive shaft 24. Thefirst gear 46 is configured and arranged to rotate about drive axis A-A. In one embodiment, thefirst gear 46 may be connected to thesecond pump 30 viadrive shaft 24 and configured to rotate with thedrive shaft 24. In another embodiment, thefirst gear 46 may be provided on itsown shaft 44 that is connected to drive shaft 24 (with or without coupling 25) (further described below). In an embodiment, the second gear 48 a driven gear coupled to arotatable shaft 52 provided on a driven axis B-B (seeFIGS. 4A and 5 ). Driven axis B-B is parallel to drive axis A-A. The output from thefirst pump 20 may be selectively activated for pressurizing and pumping lubricant to the outside system (see, e.g.,FIGS. 12-13 ). In an embodiment, a valve (such asvalve 114 shown inFIG. 12 ) may be provided to limit or selectively provide lubricant to the system. In another embodiment, the system may be designed to combine its outlet with a second pump (not shown). Alternatively, in an embodiment, the outlet from the pump may be used just for lubrication as part of a lubrication circuit or just for cooling as part of a cooling circuit. - In one embodiment, the
second pump 30 is a gerotor pump comprising aninner rotor 56 that acts as a driving gear and that is rotated relative to anouter rotor 58. Theinner rotor 56 is fixedly secured to the shaft 24 (or shaft 42) for rotation about axis A-A with thedrive shaft 24. Theouter rotor 58 may be rotatably received in a part of the housing 12 (specifically,common wall 80, as described below), according to one embodiment. In another embodiment, theouter rotor 58 is fixed within thecommon wall 80. Theinner rotor 56 meshes with theouter rotor 58 using teeth provided on each gear (e.g.,inner rotor 56 has male teeth or external teeth provided along an outer periphery thereof, whileouter rotor 58 has female receiving portions or internal teeth in an inner periphery thereof, for receipt of the male teeth of the inner rotor 56). Theouter rotor 58 has greater number of teeth or portions than theinner rotor 56. The axis of theinner rotor 56 is offset from the axis of theouter rotor 58. In one embodiment, both rotors may rotate on their respective axes. Alternatively, in another embodiment, theinner rotor 56 rotates relative to theouter rotor 58. As is understood by one of ordinary skill in the art, in accordance with one embodiment, rotation of theinner rotor 56 also rotates theouter rotor 58 via their intermeshed teeth to pressurize the input fluid received in areas between the complimentary parts for output from thepump assembly 10, and thus such details are not described here. The offset of their axes creates a changing-volume space between them. During a rotation cycle, fluid may enter a suction side of the gerotor, get pressurized due to the changing-volume space, and the pressurized fluid is discharged at a discharge port of the gerotor. Thedrive shaft 24 may be configured to drive theinner rotor 56, for example. In an embodiment, such as shown inFIG. 3 (whereincover 36 is removed from thehousing 12 for illustrative purposes only), theouter rotor 58 may be provided (and rotated in) in arotor pocket 54, which forms part of one rotor chamber that is provided in thehousing 12. - As illustrated and described herein, the
housing 12 is designed such that it provides two internal chambers therein; i.e., one internal chamber for the first (high pressure, external gear)pump 20, and one internal chamber for the second (low pressure, gerotor) pump 30. Each of these internal chambers receive and pressurize lubricant therein using respective pump parts. In particular,housing 12 includes awall 80 that is common—also referred to as a “common wall” 80 in this disclosure—to both thefirst pump 20 and thesecond pump 30 of thepump assembly 10, that forms part of each internal chamber. Thecommon wall 80 may be positioned in a relatively radial direction (relative to the drive axis A-A) within thepump assembly 10. Thefirst pump 20 is provided on a first radial side 82 of thecommon wall 80 and thesecond pump 30 is provided on a second radial side 84 of thecommon wall 80 that is opposite to the first side. As seen inFIG. 4A , for example, thedrive shaft 24 extends through thecommon wall 80 and connects to each of thedrive gear 46 and drivinggear 56 of both thefirst pump 20 and thesecond pump 30, respectively. In an embodiment, thegears external gear pump 20 may be provided on the first side 82 of thewall 80, and the inner andouter rotors gerotor pump 30 may be provided on the second side 84 of thewall 80. - In an embodiment, the
common wall 80 forms at least part of each of the internal chambers provided in thepump assembly 10, and the covers—eithercover plate 16 orcover plate 36—form the other part of each of the internal chambers. For example, thecommon wall 80 may be a substantially flat wall that extends between the parts (e.g., gears) of thepumps wall 80 may be substantially flat. In this disclosure, substantially flat refers to a side of the common wall that may be positioned flush with another portion (e.g., cover) of thepump assembly 10, but that does not include pockets or chambers for receipt of pump parts therein. Such a substantially flat wall may include channels, paths, or routes that are drilled along a portion of the wall, however. In such an embodiment, thecovers pumps covers common wall 80, the inner radial walls of each of thecovers pumps 20, 30) peripherally. - In another embodiment, the
common wall 80 defines the pressurizing internal chambers in each of thepumps FIGS. 4A and 11A , thecommon wall 80 may include afirst pocket 86 or first rotor chamber on the first side 82 thereof containing the at least one gear (e.g., drive gear 46) of thefirst pump 20 therein. Asecond pocket 54 or second rotor chamber may be provided on a second side 84 of thewall 80 containing the at least one gear (e.g., driving gear or inner rotor 56) of thesecond pump 30 therein. Thecommon wall 80 may be positioned in a radial direction (relative to the drive axis A-A) and each of thepockets wall 80. Thepockets pump second pocket 54 may be sized in order to receive (and optionally allow rotation of) theouter rotor 58 of thegerotor pump 30 therein. In one embodiment,first pocket 86 may be sized to receive and allow rotation of both the first andsecond gears external gear pump 20 therein. That is, thepocket 86 may be sized such that, when thegears - Accordingly, the walls of the
pockets peripheral wall 23 that extends around the gears peripherally to form the internal chambers. Thecovers common wall 80 to help enclose the internal chambers along with thecommon wall 80. Thecover 36 is not shown inFIG. 3 , for example, so that some of the internal components of thesecond pump 30 can be seen. One ormore seals 43 may be provided between thecommon wall 80 and covers 16, 36, for example. In an embodiment, asingle seal 43 is provided around any openings or connection points therebetween incover 16, such as shown inFIG. 14 . Thecovers - The
cover 16 may also contain, in one embodiment, one ormore grooves FIG. 7 ) on its inside radial wall to accommodate ends of thedrive shaft 24/44 and/or drivenshaft 52 therein. As shown inFIG. 7 , for example, an underside or an inner radial side (pump-facing side) of thecover plate 16 may have a recessedpassage 61 tohouse seal 43 which separates theinlet 60 from the outlet on the backside of thespacer 50 or plate. Similarly, in an embodiment, as shown inFIG. 10 , an inner side (pump-facing side) of thecover plate 36 may include shadow ports for the inlet and outlet porting for the gear/gerotor set (56 and 58) of thesecond pump 30. - Alternatively, in another embodiment such as shown in
FIG. 17 , the underside or inner radial side of thecover plate 16 may be provided without a recessedpassage 61. In such an embodiment, which is described in detail later with respect to pumpassembly 10A, thespacer 50 or pressure compensating plate may be provided on an opposite side of the external gearset, i.e., on an inner side at or in thepocket 86, and/or at or nearcommon wall 80. - In one embodiment,
first pocket 86 may be formed in the first side 82 of thecommon wall 80 to acceptdrive gear 46 and its shaft (driveshaft 24 and/or shaft 44) and a third pocket is also formed in the first side 82 of thewall 80. The third pocket may be a separate pocket that is provided to contain the second/drivengear 48 of the first pump, and its rotating/drivenshaft 52, therein. In accordance with yet another embodiment, a secondary pocket may be contained in either the first pocket 86 (when formed to contain a length of the intermeshed gears) or the third pocket for receiving an end of the drivenshaft 52 of theexternal gear pump 20. - In yet another embodiment, the
common wall 80 may have one side that is substantially flat and an opposite side with one or more pockets therein. The flat side of thecommon wall 80 may be connected to a cover plate that has one or more pockets therein for receipt of at least one of the gears for one of the pumps, such that when the cover is connected with the flat side of thecommon wall 80, the internal chamber is formed therein. On the opposite side of the common wall, the one or more pockets may be configured to receive one or more gears of the other of the pumps, and the cover plate may be attached thereto to form the additional internal chamber of thepump assembly 10. - The
common wall 80 and/orhousing 12 may be formed from any number of materials and manufactured in a number of ways. In one embodiment, thecommon wall 80 is molded, e.g., injection molded. In another embodiment, thecommon wall 80 may be formed via a molding process that further includes machining and/or drilling processes. For example, thepockets common wall 80. In one embodiment, thecommon wall 80 may be formed via a casting process (die casting), powder metal forming, forging, stamping, or any other desired manufacturing technique. Other parts of thehousing 12 may be formed by similar techniques, i.e., stamping, casting, powdered metal forming, molding, etc. In accordance with embodiments, thehousing 12 and itscommon wall 80 may be formed using a casting technique. In accordance with embodiments thehousing 12 andwall 80 may be formed from die cast aluminum or cast iron. In accordance with an embodiment,common wall 80 and the walls forming the pockets may be a single, unitary and continuous part, i.e., integral. - The
drive shaft 24 extends through thewall 80 and connects to each of the driving gears 56, 46 contained in thefirst pocket 86 and thesecond pocket 54, respectively. In the illustrated embodiment, the driving gear of theexternal gear pump 20 isgear 46, which is driven by thedrive shaft 24 connected to thesecond pump 30, and the driven gear isgear 48, which is coupled torotatable shaft 52. - In an embodiment, one or
more spacers 50, pressure compensation plates, or collars may be provided adjacent to the first andsecond gears first pump 20 to substantially prevent sliding (axial) movement of thegears wall 80. For example, thegears common wall 80. Spacer(s) 50, plate(s), or collar(s) may be placed on a side opposite to the first side 82 of thecommon wall 80, and fitted on theshafts gears cover 16. As shown in the exploded view ofFIG. 6 , which shows the parts of the drive shaft 24 (i.e.,shafts 42 and 44), rotatingshaft 52, and gears 46, 48 and 56, 58 of thepumps spacer 50 may be a part of singular construction having openings 51A, 51B extending therethrough for receipt of theshafts 44, 52 (respectively). In addition to holding thegears pocket 86 of thewall 80 in housing 12 (and aiding in reducing or preventing axial movement of thegears wall 80,housing 12 and/orcover 16. - As previously noted, the
drive shaft 24 that drives both thefirst pump 20 and thesecond pump 30 extends through thehousing 12, as shown inFIG. 4A . Accordingly, thecommon wall 80 may also have a receivingopening 88 that axially extends through thecommon wall 80, extending between thesecond pocket 54 andfirst pocket 86, for receipt of thedrive shaft 24 therethrough. The size of the receivingopening 88 may be based on the diameter or size of thedrive shaft 24. - In one embodiment, the
drive shaft 24 is a single, common drive shaft for bothpumps housing 12 and into at least portion of thepumps first pump 20 andsecond pump 30. The receivingopening 88 may have a substantially consistent diameter along its axial length from one end (e.g., at second pocket 54) to the other (e.g., at first pocket 86). - In another embodiment, such as shown in
FIGS. 4A, 5, and 11A , thedrive shaft 24 may be formed from afirst drive shaft 42 and asecond drive shaft 44 that are co-axially connected to one another for rotating together about the drive axis A-A. In an embodiment, thefirst drive shaft 42 and thesecond drive shaft 44 are connected via acoupling 25. In one embodiment, such as shown in the cross section ofFIG. 4A , thecoupling 25 has a first extension end that is inserted into an opening in thedrive shaft 42, and a second end that has an opening therein for receiving an end of thefirst drive shaft 42 therein. In another embodiment, such as illustrated in the exploded view ofFIG. 6 , thecoupling 25 has an opening on either of its sides. The first drive shaft may include a connector 42A on its end that is inserted (e.g., press-fit) into one opening of thecoupling 25, and/or the second drive shaft may include aconnector 44A on its end that is inserted (e.g., press-fit) into the other opening of thecoupling 25.Such coupling 25 is optional and need not be provided. The illustrated couplings are exemplary only and not intended to be limiting. For example, the shafts may be directly connected using a receiving portion and corresponding connector portion (e.g., male and female parts), thus forming a coupling therebetween. In an embodiment, one of the drive shafts (e.g., first drive shaft) may include a connector male portion 42A1 that is inserted into a female receiving connector portion 42A2 of the other drive shaft (e.g., second drive shaft). An exemplary embodiment of such a coupling for the drive shaft(s) is shown inFIG. 27A andFIG. 27B . In some embodiments, the receivingopening 88 may include additional step portions therein to accommodateshafts optional coupling 25. That is, the receivingopening 88 may include multiple diameters along its axial length to accommodate parts associated with thedrive shaft 24. - The
drive shaft 24 is driven by a single input device or driver, which may be mechanical, electric, or electro-mechanical—e.g., anelectric motor 90, such as shown inFIGS. 8-10 and 11A-11C , an engine, an internal combustion engine (ICE), or a prime mover. As shown in these Figures, in one embodiment, thepump assembly 10 is configured for assembly with anelectric motor 90. As shown in the cross sectional view ofFIG. 11A , thepump assembly 10 andelectric motor 90 are axially aligned on drive axis A-A. Theelectric motor 90 is contained in acasing 91 and hasmotor shaft 92 configured to drive thedrive shaft 24 of thepump assembly 10. In one embodiment, themotor shaft 92 and driveshaft 24 may be a single shaft that extends from themotor 90 and into thepump assembly 10. In accordance with another embodiment, such as shown inFIG. 11A , theelectric motor 90 may have its own, separatemotor drive shaft 92 configured to be driven about axis A-A, and still connected to thepump assembly 10, in order to drive thepumps pump assembly 10. In an embodiment, themotor shaft 92 has anend 94 that is configured connection to aconnector portion 22 of thepump assembly 10. For example, theend 94 may be configured to be press-fit into an opening in theconnector portion 22 for axial rotation along axis A-A. - More specifically, the
connector portion 22 is provided on thesecond side 18 of thepump assembly 10 for connecting an input device or a driver (e.g., such amotor 90 shown inFIGS. 8-9 ). According to one embodiment, as shown, theconnector portion 22 has a receiving area or opening 21 for receiving part of a driving shaft (motor shaft 92) of the driver therein. In one embodiment, theconnector portion 22 may be integrated into an end of thedrive shaft 24. That is, thedrive shaft 24 may extend through thehousing 12 and have one of its ends extending through (second)cover plate 36 on thesecond side 18 of thepump assembly 10, such that it may be connected to the driver. In another embodiment, theconnector portion 22 may be a coupling that is attached to the end of thedrive shaft 24, and placed in or on thecover plate 36 when assembled. - In an embodiment, the
casing 91 includes a sleeve 95 (seeFIG. 10 ) to assist in securement of themotor 90 to thepump assembly 10. As shown in the exploded view ofFIG. 7 , for example, thecover plate 36 provided on thesecond side 18 of thepump assembly 10 may include acavity 37 on an outer radial side thereof configured to receive thesleeve 95 of themotor 90 therein when assembled together. In a particular embodiment, as shown inFIG. 11A , theconnector portion 22 is aligned with and inserted into anopening 97 of thesleeve 95, while the outside of thesleeve 95 is provided in thecavity 37. One ormore seals 39 or O-rings may be provided around theconnector portion 22. - The
electric motor 90 may include arotor 96 and a stator 98 (seeFIG. 11A ) and a number ofbearings 99 on provided on itsmotor shaft 92. Therotor 96 is connected to themotor shaft 92 which is contained within itscasing 91 along with thestator 98. Themotor casing 91 is generally cylindrical (seeFIG. 11B ) and thestator 98 may be fixed thereto. In an embodiment, shown inFIG. 11C , themotor casing 91 may include coolingfins 93 provided on outer side thereof (i.e., the side opposite to that which thepump assembly 10 is attached). -
FIGS. 15-17 depict another embodiment of apump assembly 10A that includes first andsecond pumps FIGS. 15-17 are labeled with same designations and numbering as discussed with reference toFIGS. 1-14 . Thus, although not discussed entirely in detail herein, one of ordinary skill in the art should understand that various features associated with thepump assembly 10 ofFIGS. 1-14 are similar to those features previously discussed. Additionally, it should be understood that the features shown in each of the individual figures is not meant to be limited solely to the illustrated embodiments. That is, the features described throughout this disclosure may be interchanged and/or used with other embodiments than those they are shown and/or described with reference to.Pump assembly 10A may be driven by a driver such asmotor 90, for example. Much likepump assembly 10,pump assembly 10A includesfirst pump 20 andsecond pump 30. Driveshaft 24 is provided in the housing configured to rotate about a drive axis A-A and drive both thefirst pump 20 and thesecond pump 30. Acoupling 25 may be optionally provided to connectdrive shafts drive shaft 24, or a single drive shaft may be provided. First pump 20 may be a high pressure external gear pump andsecond pump 30 may be a low pressure gerotor pump that are paired together and configured to be driven off the same drive shaft. Thefirst pump 20 has a first inlet provided on the housing for receiving lubricant from a source outside the housing and a first outlet for directing lubricant that is pressurized out of the housing. The second pump has a second inlet provided on the housing for receiving lubricant from the source outside the housing and a second outlet for directing lubricant that is pressurized out of the housing. The second inlet and the second outlet are different than the first inlet and the first outlet, respectively. The housing further includes acommon wall 80 to both thefirst pump 20 and thesecond pump 30, which may be seen inFIG. 15 . Thefirst pump 20 is provided on a first (right) side of the wall and thesecond pump 30 is provided on a second (left) side of the wall that is opposite to the first side. The drive shaft extends through thecommon wall 80 and connects to gears (e.g., gears 46 and 56) of both thefirst pump 20 and thesecond pump 30. - In this illustrated embodiment, the underside or inner radial side (pump facing side) of the
cover plate 16 may include receivingopenings 17 therein (seeFIGS. 15 and 17 ) for receipt of one end of each of theshafts gears first pump 20. In this embodiment, thespacer 50 or pressure compensating plate may be provided on an opposite side of the external gearset. That is, rather than being provided adjacent to thecover plate 16 as shown inFIG. 7 , thespacer 50 is provided on an inner (opposite) side, within thepocket 86 and/or at or nearcommon wall 80. As seen inFIG. 15 , for example, thepocket 86 ofcommon wall 80 may receiveseal 43A,spacer 50 and then thegears Seal 43A may be housed in thepocket 86 to separate the side of thespacer 50 or plate from direct contact with thecommon wall 80 while still providing support and/or pressure with respect to the external gearset offirst pump 20.Shaft 44/drive shaft 24 extends throughcommon wall 80 and is connected to the drive shaft 42 (24) of thegerotor gearset other pocket 54 on the opposite side of thecommon wall 80. -
FIGS. 18-28 depict yet another embodiment of apump assembly 10B that includes asingle housing 12 having acommon wall 80 and driveshaft 24, and first andsecond pumps FIGS. 18-28 are labeled with similar or same designations and numbering as discussed with reference toFIGS. 1-14 . Thus, although not discussed entirely in detail herein, one of ordinary skill in the art should understand that various features associated with thepump assembly 10 ofFIGS. 1-14 and/or thepump assembly 10A ofFIGS. 15-17 are similar to those features previously discussed. Additionally, it should be understood that the features shown in each of the individual figures is not meant to be limited solely to the illustrated embodiments. That is, the features described throughout this disclosure may be interchanged and/or used with other embodiments than those they are shown and/or described with reference to.Pump assembly 10B may be driven by a driver such asmotor 90, for example, e.g., an electric motor, an engine, or a transmission. In an embodiment, there may be a single input device for driving thedrive shaft 24 of thepump assembly 10B; the input device may be an engine, a transmission, or an electric motor. Much likepump assembly 10,pump assembly 10B includesfirst pump 20B andsecond pump 30B. Driveshaft 24 is provided in the housing configured to rotate about a drive axis A-A and drive both thefirst pump 20B and thesecond pump 30B. In an embodiment, such as shown inFIG. 27A andFIG. 27B , thedrive shaft 24 may be formed from afirst drive shaft 42 and asecond drive shaft 44 that are co-axially connected to one another for rotating together about the drive axis A-A. In an embodiment, thefirst drive shaft 42 and thesecond drive shaft 44 are connected using a receiving portion in one end of a shaft (e.g., indrive shaft 44, as shown inFIG. 27A ) and corresponding connector or insertion portion in another end of a shaft (e.g., indrive shaft 42, as shown inFIG. 27A ) (e.g., male and female parts), thus forming a coupling therebetween. In another embodiment, thefirst drive shaft 42 and thesecond drive shaft 44 may be connected via aseparate coupling 25, such as previously described with reference to the embodiments above. - First pump 20B in the illustrative embodiment of
FIGS. 18-28 may be an air pump for pressurizing air, andsecond pump 30B may be an oil pump or a lubricant pump configured to pressurize lubricant. Thefirst pump 20B andsecond pump 30B ofassembly 10B are paired together and configured to be driven via thesame drive shaft 24. Thefirst pump 20B has afirst inlet 60A provided on thehousing 12 and afirst outlet 62A (seeFIG. 21 ) for directing air that is pressurized out of thehousing 12. Thefirst pump 20B may be connected to a closed network (e.g., brake booster system) and configured to receive air therefrom to evacuate the connected system. Thefirst inlet 60A has a first inlet opening 64A that is provided on a plane that is perpendicular to the drive axis A-A of thedrive shaft 24, in accordance with an embodiment. Thefirst outlet 62A has at least onefirst outlet opening 66A. In the exemplary illustrated embodiment, theoutlet 62A includes twooutlet openings 66A. - The
second pump 30B has a second inlet 68 (seeFIG. 27A ) provided on thehousing 12 for receiving lubricant from the source outside the housing and asecond outlet 70 for directing lubricant that is pressurized out of thehousing 12. Thesecond inlet 68 and thesecond outlet 70 are different than thefirst inlet 60A and thefirst outlet 62A, respectively. Thesecond inlet 68 has a second inlet opening 72. In accordance with an embodiment, the first outlet opening(s) 66A and the second inlet opening 72 are provided on the same side of thehousing 12, i.e., on the same side of thecommon wall 80 or an axis extending through thecommon wall 80, such as shown inFIG. 23 . Thesecond outlet 70 has a second outlet opening 74. Thesecond outlet 70 includes anoutlet path 70B that directs output/pressurized fluid to the second outlet opening 74 in the housing. In an embodiment, the second outlet opening 74 is provided on the same side of the housing as the first inlet opening 64A, i.e., on the same side of thecommon wall 80, such as shownFIGS. 18 and 20 . - In accordance with an embodiment, the
first inlet opening 64A is provided on a plane that is parallel to the drive axis A-A of thedrive shaft 24. In accordance with an embodiment, the second outlet opening 74 is provided on a plane that is parallel to the drive axis A-A of thedrive shaft 24. - In an embodiment, illustrated in the cross sectional view of
FIG. 27A , a passage orinlet path 65 may be provided inhousing 12 for feeding lubricant to thesecond pump 30B in thehousing 12. Thesecond pump 30B may receive input lubricant via aninlet path 65 connected to the second inlet opening 72, as described in greater detail below. A lubricant source (e.g., tank, sump) fluidly connects to the second inlet opening 72 and thisinlet path 65 for delivery to thesecond pump 30B. As shown inFIGS. 19-22 , for example, thesecond inlet 68 and inlet opening 72 may be in fluid communication for directing input lubricant into and through theinlet path 65 or passage. Thisinlet path 65 may be a formed or drilled path in thehousing 12 that leads to thesecond inlet 68 of thesecond pump 30, for example, as well as the pumping elements (e.g., rotor, vanes) of thesecond pump 30B. Theinlet path 65 may be in the form of a tube, for example, in accordance with an embodiment. As shown inFIGS. 21 and 27A , a screen or filter 81 may be provided between the main inlet opening 72 andinlet path 65 or passage/second inlet 68 before any lubricant enters theinlet path 65 within thehousing 12 such that any particulates may be filtered from the input lubricant before being directed to the pumping elements ofsecond pump 30B. In an embodiment, a shape (as shown here, e.g., a cone-shape) of the housing near inlet opening 72 may be designed to slow input fluid down before thefilter 81 to reduce the pressure drop over thefilter 81. So the fluid is drawn in through second inlet opening 72, may expand within the (cone-shaped) housing to slow down before it passes throughfilter 81, and then travels through theinlet path 65 into the oil pump rotating group ofsecond pump 30B. More specifically, in accordance with an embodiment, theinlet opening 72 and housing is configured for placement within a source (e.g., sump of the engine) such that theinlet opening 72 sits within the lubricant (oil) and is at least somewhat submerged within the source of lubricant. Accordingly, the screen or filter 81 can filter any unwanted particulates that may be recirculated within the system during operation of thepump assembly 10B. - As mentioned above, in an embodiment, the second or main inlet opening 72, such as shown in
FIGS. 18, 19, and 21 , may be provided in thehousing 12 to direct input lubricant (e.g., from a source) intopump 30B. That is, this second inlet opening 72 may fluidly connect toinlet path 65 and thussecond inlet 68. In an embodiment, theinlet opening 72 is provided on a plane that is perpendicular to the drive axis A-A of thedrive shaft 24. In one embodiment, theinlet opening 72 is positioned on another side of thehousing 12 as compared to thesecond pump 30B, i.e., it positioned on a first side (e.g., right) of the common wall 80 (on the same side asfirst pump 20B), while thesecond pump 30B is positioned on the second, opposite side (e.g., left) of thecommon wall 80. Accordingly,inlet path 65 connects theinlet opening 72 and second inlet 68 (such as shown inFIG. 27A ). In an embodiment, the first inlet opening 64A and the second inlet opening 72 are provided on the opposite sides of the housing. In an embodiment, the second inlet opening 72 is positioned on thefirst side 14 of thepump assembly 10. - The
housing 12 further includes acommon wall 80 to both thefirst pump 20B and thesecond pump 30B, which is shown inFIG. 27A , for example. Thefirst pump 20B is provided on a first (right) side of the wall and thesecond pump 30B is provided on a second (left) side of the wall that is opposite to the first side. Thedrive shaft 24 extends through thecommon wall 80 and connects to drive rotors (e.g., bearing 71 torotor 48A androtor 56A) of both thefirst pump 20B and thesecond pump 30B. - In an embodiment, the common wall 80 (see
FIG. 27A ) forms at least part of each of the internal chambers provided in thepump assembly 10, and the covers—eithercover plate 16 orcover plate 36—form the other part of each of the internal chambers. In one embodiment, thecommon wall 80 defines the pressurizing internal chambers in each of thepumps FIGS. 24, 25, and 27A , thecommon wall 80 may include afirst pocket 86 or first rotor chamber on the first side 82 thereof containing the bearing 71 and drivenrotor 48A of thefirst pump 20 therein. Asecond pocket 54 or second rotor chamber may be provided on a second side 84 of thewall 80 containing the at least one rotor (e.g.,rotor 56A) of thesecond pump 30 therein. Thecommon wall 80 may be positioned in a radial direction (relative to the drive axis A-A) and each of thepockets wall 80. Thepockets pump second pocket 54 may be sized in order to receive therotor 56A and control slide 116 of avane pump 30 therein; i.e., sized in order to allow and accommodate movement of theslide 116 relative to the internal wall of thepocket 54. In one embodiment,first pocket 86 may be sized to receive and allow eccentric rotation of drivenrotor 48A withinpump 20. - Accordingly, the walls of the
pockets covers common wall 80 and/orhousing 12 to help enclose the internal chambers along with thecommon wall 80. Thecover 36 is not shown inFIG. 24 , for example, so that some of the internal components of thesecond pump 30B can be seen. Similarly, thecover 16 is not shown inFIG. 25 , for example, so that some of the internal components of thefirst pump 20B can be seen. - One or
more seals 43 may be provided between thecommon wall 80 and covers 16, 36, for example. In an embodiment, asingle seal 43 is provided around any openings or connection points therebetween incover 16, such as shown inFIG. 27A . - The underside or inner radial side (pump facing side) of the
cover plate 16 of thefirst pump 20B may include a receivingopening 17 therein (seeFIG. 26 ) for receipt of one end of thedrive shaft 44 for the gears/bearing 71/rotor 48A of thefirst pump 20B. More specifically, an end of the drive shaft may be press-fit into receivingopening 17, and may or may not include a bushing. Also, as described later, thedrive shaft 24 is received in a central bore of astationary guide gear 46A or sprocket, which acts as a bearing to support the end of the drive shaft.Shaft 44/drive shaft 24 extends throughcommon wall 80 and is connected to the drive shaft 42 (24) of the bearing 71 and thusrotor 48A, which is contained in first pocket 86 (seeFIGS. 25 and 27A ) on the opposite side of thecommon wall 80. In an embodiment, thedrive shaft 24, or at least a portion thereof, is configured to extend through thecover plate 36 of thesecond pump 30B. More specifically, a connector portion 22 (e.g., seeFIG. 18 ) may be provided on thesecond side 18 of thepump assembly 10B for connecting an input device or a driver (e.g., such amotor 90 shown inFIGS. 8-9 ) thereto. According to one embodiment, as previously described, theconnector portion 22 may have a receiving area or opening 21 for receiving part of a driving shaft (motor shaft 92) of the driver therein. - Referring now more specifically to each of the pumps, in accordance with an embodiment, the
first pump 20B of thepump assembly 10B may be an epitrochoidal vacuum pump, designed to produce epitrochoidal-like rotation of itsrotor 48A within thepocket 86 andhousing 12. An epitrochoid is defined as a geometric curve or plane curve that is generated by tracing motion of a fixed point on the radius (or extended radius) of a circle as it rolls on the outside/external portion of a fixed, base circle. As understood by one of ordinary skill in the art, the shape of the inner envelope of the epitrochoid (which is the basis for the shape of the housing in which the rotor rotates) determines or aids in generating the shape of the rotor (i.e., the shape of the outer edges or lobes of the rotor). In this exemplary embodiment, for illustrative purposes and without intending to be limiting, a twolobed rotor 48A is shown. Generally, such a design improves upon such principles of a Wankel engine within a vacuum pump. In accordance with an embodiment, thefirst pump 20 may be or include features of the epitrochoidal pump as disclosed in U.S. patent application Ser. No. 15/946,944, filed Apr. 6, 2018, which is hereby incorporated by reference in its entirety. Below some of the features of such an epitrochoidal pump are described. - Generally, in an embodiment, the first side of the wall or
pocket 86 of the epitrochoidalfirst pump 20B defines and is part of an internal space having an epitrochoidal shape. Therotor 48A of the epitrochoidal vacuum pump is rotatably received within the internal space orpocket 86. Therotor 48A is shaped with a number of edges that conjugate with the epitrochoidal shape of the internal space and has an internally toothed guide gear portion 49 (seeFIG. 25 ). Thedrive shaft 24 is configured to drive the eccentric bearing 71 to thus rotate therotor 48A eccentrically within the internal space orpocket 86. As previously noted, the externallytoothed guide gear 46A (or sprocket) is connected to thedrive shaft 24 for support while therotor 48A is driven by thedrive shaft 24. - In the illustrated embodiment, for example, the
first pump 20B ofpump assembly 10B utilizes a twolobed rotor 48A, oneinlet 60A, and at least oneoutlet 62A provided in ahousing 12. For illustrative purposes only, the vacuum/first pump 20B is illustrated with twooutlet openings 66A, that connect to passageways within the pump assembly, that form asingle outlet 62A of thepump 20B. Theopenings 66A may be positioned adjacent or next to each other to provide another channel and larger area for expulsion of air, effectively increasing the cross-sectional area of the outlet port. This may also assist in reducing resistance(s) during expulsion, for example.Reed valves 61A (seeFIG. 21 ) may be provided on eachopening 66A of theoutlet 62A. Opening and closing timing of theoutlet openings 66A via their associatedreed valves 61A may be configured to be identical, in accordance with one embodiment, such that they act as oneoutlet 62A for the housing. A second inlet port or inlet 77 (e.g., seeFIGS. 18-19 ) may be a radially positioned inlet provided along the inlet path or inlet channel, the inlet channel being connected toinlet 60A (radial relative to axis A-A) and configured to direct input air frominlet 60 to an internal inlet port within thepocket 86. Theinlet port 77 may also have areed valve 77A associated therewith. Operation ofreed valves inlet port 77 in the inlet path aids in preventing unwanted pressurization. Theinlet port 77 is configured to provide protection against any potential consequences with regards to the pump spinning backwards or other unwelcome movement of the pump rotor or parts; that is, if the pump (i.e.,rotor 48A) were to run or spin backwards, e.g., to evacuate the chamber orpocket 86, theninlet port 77 andreed valve 77A may prevent unwanted pressurization and/or back metering of lubricant or oil in thepocket 86, due to its close proximity to a check valve (e.g., associated with the engine) in the system. -
Pocket 86 acts as a single epitrochoidal working chamber and has a chamber volume. For each rotor revolution, each chamber fulfills two evacuation cycles. Accordingly, the total evacuation capacity per pump shaft rotation in the disclosedvacuum pump 10A is defined as: single chamber volume×1 (since there is one chamber)×2 (evacuation cycles per rotor revolution)/2 (rotor speed reduction to shaft speed); therefore, the total evacuated capacity is 1*single chamber volume. The surrounding wall of thepocket 86 defines an internal space which is an epitrochoidally generated shape (not circular or substantially circular) and is flanked bycover 16 andcommon wall 80. Therotor 48A is rotatably received within the internal space of the chamber orpocket 86. As is known in the art, the chamber orpocket 86 is a single working chamber that is varied in size by therotor 48A as it rotates and orbitally revolves therein along the surrounding wall. During rotation, each side surface of therotor 48A is brought closer to and then away from the wall of thepocket 86, without fully contacting the wall (e.g., due to manufacturing clearances). Corners or apices of therotor 48A are guided along the wall in a sliding contact manner (e.g., via seals 75) during rotation of therotor 48A. - The body of the
rotor 48A may have a substantially ovular shape, with two sides having convex, bow-shaped flanks (see, e.g.,FIG. 25 ) forming its outer walls or edges, in accordance with an embodiment. Rotation of therotor 48A is performed eccentrically about axis A-A and is implemented by an internally toothed opening orportion 49 integrated in the rotor, an externallytoothed guide sprocket 46A, bearing 71, and a drive shaft 24 (44).FIG. 26 shows an exploded view parts of thefirst pump 20B, including bearing 71,rotor 48A, guidesprocket 46A, andshaft 44/24. The body of therotor 48A may have an opening in its center that is internally toothed for receipt of theguide sprocket 46A therein. The central opening may be defined by a plurality of radially extendingfemale teeth 49 on the interior thereof. Theguide sprocket 46A is received within the central opening. Theguide sprocket 46A may have a plurality of radially extending male teeth on the exterior thereof that mesh with and guide movement of therotor 48A, as the drive shaft is rotated. - The drive shaft 24 (44) is designed to extend through the
rotor 48A towardscover 16. An end of the drive shaft is received within a central hole of theguide sprocket 46A and secured from rotating therein by a bushing, for example. An end of the drive shaft may be placed into the receivingopening 17. To implement eccentric movement of therotor 48A about axis A-A, an eccentric rotation bearing 71 is provided (seeFIG. 26 ). In an embodiment, a spacer is provided to axially locate the eccentric bearing 71, e.g., during the press fitting of the pieces (i.e., driveshaft 44, bearing 71) together. The spacer may reduce the size and weight of the eccentric bearing 71 to thereby improve balancing of the bearing. Eccentric rotation bearing 71 may have its own receiving opening for positioning of thedrive shaft 44 therethrough. In an embodiment, driveshaft 44 may include a stepped configuration of successively increasing diameters for assembly with therotor 48A. - The
aforementioned inlet 60A may thus be a vacuum inlet for inputting air into the housing. Thevacuum inlet 60A includes an input channel or passageway that winds within the housing and receives (pulls via vacuum) air through. Air is communicated and drawn through the passageway and into at least one radial inlet port (not shown) provided in the surrounding wall of thepocket 86. Accordingly, theinlet port 64A fluidly connects to the inside of the chamber orpocket 86.Inlet 60A and itsport 64A selectively draws and delivers air under negative pressure (vacuum), dependent upon the position of the rotor 48B. - In one embodiment, the
second pump 30B is a vane pump comprising aninner rotor 56A and a control slide 116 (seeFIGS. 24 and 28 ) having arotor receiving space 118 communicated to thesecond inlet 68 and thesecond outlet 70. The control slide 116 (also referred to as a control ring in the art) is mounted in thehousing 12 for pivotal movement in opposing displacement increasing and displacement decreasing directions. As illustrated inFIGS. 24 and 28 , thecontrol slide 116 has a pivotal connection established by apivot pin 122. Thecontrol slide 116 pivots about that pivotal connection/pin 122 in the displacement increasing and displacement decreasing directions, dependent upon the pressurized fluid therein, during operation of the pump. Therotor receiving space 118 may be an essentially cylindrical bore extending through the thickness of the control slide body, as illustrated; i.e., thecontrol slide 116 has an inside or inner surface definingrotor receiving space 118. Thisrotor receiving space 118 communicates directly with the inlet andoutlet inlet 65, and expelling the same under positive discharge pressure out theoutlet 70. - The
rotor 56A of thesecond pump 30B is provided in therotor receiving space 118, as shown inFIG. 28 . Therotor 56A is configured for rotation within and relative to thecontrol slide 116. Therotor 56A has a central axis that is typically eccentric to a central axis of the control slide 116 (and/or rotor receiving space 118). Therotor 56A is fixedly secured to the shaft 24 (or shaft 42) for rotation about axis A-A with thedrive shaft 24. Therotor 56A comprises a plurality ofvanes 120. Thevanes 120 may be retractable and optionally have springs or other features (e.g., fluid channels) for biasing thevanes 120 radially outwardly for contact with the inner surface of therotor receiving space 118. Therotor 56A is rotatably mounted in the rotor receiving space 118 (clockwise in the orientation shown inFIG. 28 ) to draw lubricant (e.g., from a source, such as a lubricant sump (e.g., an oil sump) or from generally within an enclosed space (e.g., from within a transmission housing) under negative pressure into therotor receiving space 118 via theinlet 68 and discharge the lubricant from therotor receiving space 118 via theoutlet 70 under positive pressure. Theoutlet 70 generally expels the lubricant under positive pressure to the device requiring lubrication, such as to the oil gallery of an engine. - As generally understood in the art, movement of the
control slide 116 in the displacement increasing direction increases eccentricity between therotor 56A and thecontrol slide 116 for increasing a pressure differential between theinlet 68 andoutlet 70. Conversely, movement ofcontrol slide 116 in the opposite displacement decreasing direction decreases that eccentricity for decreasing the pressure differential. The principle of operation creating the pressure differential between the low pressure side of therotor receiving space 118 and the high pressure side thereof based on the change in volume of the pockets between the individual vanes as regulated by the eccentricity between thecontrol slide 116 and therotor 56A is well-known and need not be described in detail. - The
rotor 56A may be powered in any manner. For example, in engine applications, therotor 56A is often coupled to a gear or pulley driven by a belt or chain, or may be directly driven by another element of the drive train. As another example, thepump 30B may be driven by an electric motor (particularly in electrically powered vehicles) or have two input connections so as to be driven by both an engine driven element and/or an electric motor (particularly in hybrid vehicles). The manner in which therotor 56A is driven is not limiting and may occur in any manner. - A
resilient structure 124 is positioned between thehousing 12 orpocket 54 and thecontrol slide 116 to bias thecontrol slide 116 in the displacement increasing direction. In the illustrated embodiment, theresilient structure 124 is a compression spring, but it may have any structure or configuration. Thecontrol slide 116 includes a radial projection 126 (or radially extending bearing structure) opposite the pivotal connection, e.g.,pin 122, of thecontrol slide 116 to thehousing 12. The radial projection 126 has abearing surface 128 that is engaged by theresilient structure 124. In the illustrated embodiment, one end of the spring/structure 124 engages thatsurface 128, and an opposite end thereof engages against an opposing surface provided in thepocket 54 orhousing 12. Thespring 124, as illustrated is, held in compression between those surfaces thus applying a reaction force biasing thecontrol slide 116 in the displacement increasing direction. - The
control slide 116 may have one ormore seals 132 which define acontrol chamber 130 between thecontrol slide 116 and thepocket 54/housing 12. Thecontrol chamber 130 is communicated with a source of the pressurized lubricant to move thecontrol slide 116 in the displacement decreasing direction. In the illustrated embodiment, lubricant is fed into thecontrol chamber 130 viainlet path 65 and a pocket/chamber inlet port 65A. The inlet andoutlet housing 12 has at least one inlet port 65A for intaking fluid to be pumped frominlet 65, and at least oneoutlet port 70A for discharging the fluid tooutlet 70. The inlet port 65A andoutlet port 70A each may have a crescent shape, and may be formed through the same wall located on one axial side or both axial sides of the housing (with regard to the rotational axis of the rotor). The inlet andoutlet ports 65A, 70A may be disposed on opposing radial sides of the rotational axis of therotor 16. These structures are conventional, and need not be described in detail. The shape of the inlet and/or outlet is not intended to be limiting. Other configurations may be used, such as differently shaped or numbered ports, etc. Further, it should be understood that more than one inlet or outlet may be provided (e.g., via multiple ports). The chamber inlet port 65A may be communicated (directly or indirectly) tochamber outlet port 70A, throughoutlet path 70B and tosecond outlet 70 of thehousing 12, and thus the source of pressurized lubricant for thecontrol chamber 130 is the lubricant discharged from theoutlet 70. This is a known feedback approach wherein the pressure from theoutlet 70 is used to help regulate the pump's displacement and pressure. As the pressure fed back from theoutlet 70 increases, that will result in a pressure increase in thecontrol chamber 130, which in turn moves thecontrol slide 116 in the displacement decreasing direction against the bias of the resilient structure 124 (and that in turn will also decrease the pressure differential generated byvanes 120 and thus the pressure of the lubricant discharged from the outlet 70). Conversely, as the pressure fed back from theoutlet 70 decreases, that will result in a pressure decrease in thecontrol chamber 130, which in turn allows the resilient structure to move thecontrol slide 116 in the displacement increasing direction (and that in turn will also increase the pressure differential generated by therotor 56A and thus the pressure of the lubricant discharged from the outlet 70). This technique may be used to maintain a pump's output pressure and/or volumetric displacement at or near equilibrium levels. - The
second pump 30B may have multiple control chambers for providing different levels of control over the operation of thepump assembly 10B, in accordance with embodiments. In other embodiments, thepump 30B may have only one control chamber. - The
second pump 30B may also include several safety features associated therewith. For example, one or more fail-safe pressure relief valves 140 (e.g., ball valves, check valves, panic valves) may be provided in the housing 12 (seeFIGS. 26 and 27A -B). Such valves may be positioned in the inlet path or outlet path of thepump assembly 10B. In accordance with an embodiment, thesecond pump 30B may include one or more valves as disclosed in U.S. Pat. Nos. 9,534,519, 9,771,935, 10,030,656, and 10,247,187, and U.S. Provisional Ser. No. 62/799,449 filed Jan. 31, 2019, each of which is hereby incorporated by reference in its entirety. - Also, while the above exemplary embodiments with respect to
FIGS. 18-28 describe use of a vane pump assecond pump 30B along withepitrochoidal pump 20B, in another embodiment,second pump 30B may be a gerotor pump (such as shown and described previously with reference toFIG. 3 ) provided in the same housing and pump assembly asepitrochoidal pump 20B. - As such, the exemplary embodiment as shown in
FIGS. 18-28 provides a more compact packaging option for including air and lubricant pumps in a single housing assembly. Such a design reduces connection parts required to connect to the engine. It also allows for use of a common drive shaft to operate said pumps therein. - The operation of the
pump assembly 10 and/or 10A is further described with reference toFIGS. 12 and 13 . AlthoughFIGS. 12 and 13 are described with reference to pumpassembly 10, it should be understood thatpump assembly 10A may operate and be used in a similar manner aspump assembly 10. As shown in the schematic diagram ofFIG. 12 , for example, the second (low pressure, gerotor) pump 30 is configured to always provide lubrication to a transmission (seetransmission 102 inFIG. 13 ) as themotor 90 is turning. A flow restrictor may optionally be provided (e.g., outside of the pump assembly, or built into the pump assembly or well, if desired) to restrict the amount of lubricant to the transmission. A controller 104 (shown inFIG. 13 ) is configured to operate or drive the electric motor 90 (e.g., control a magnetic field of thestator 98 of the motor 90), to thus control and drive thepump assembly 10. Optionally, thesecond pump 30 may also be configured to selectively flow lubricant through to a cooling system of the transmission, e.g., if cooling is required, via operation of acontrol valve 112. Thecontroller 104 may control movement of thevalve 112 to an open position for feeding to the cooling system, for example. Optionally, a flow restrictor may also (or alternatively) be provided (e.g., outside of the pump assembly) to restrict the amount of lubricant to the cooling system. In some instances, the same flow restrictor may be provided before the inlets for lubricating and cooling the transmission. In an embodiment, the operating pressure for thesecond pump 30 may be up to approximately 3.0 bar. - Even though the
second pump 30 is configured to continuously pump lubricant to the transmission, the first (high pressure, external gear) pump 20 is not stationary. In accordance with an embodiment, thefirst pump 20 is also configured to rotate with operation of themotor 90, due to the connectingdrive shaft 24 between the twopumps first pump 20 is generally limited in operating conditions, e.g., at approximately 3.0 bar. In some embodiments, e.g., when higher pressurized lubricant is needed by the transmission, such as when lubricant is needed in by a clutch 108 in order for a shift operation to occur, there are instances wherein thefirst pump 20 is selectively activated. That is,first pump 20 may be activated to output higher pressurized lubricant to the transmission. In accordance with an embodiment, thefirst pump 20 is configured for use to output lubricant to the clutch 108/transmission when a desired operational pressure of the lubricant is greater than approximately 20 bar. In one embodiment, thefirst pump 20 is configured to operate when the desired pressure for the outside system/transmission 102 is in a range of approximately 20 bar to approximately 60 bar (both inclusive). - In accordance with an embodiment,
control valve 114, shown schematically inFIG. 12 , is provided to selectively limit (or selectively allow) output from thefirst pump 20 to the clutch 108/transmission 102. For example, in its first position, thevalve 114 may be configured to direct output pressurized fluid from first outlet opening 62 to the clutch 108. Otherwise, at lower pressures (i.e., less than 20 bar), thevalve 114 may be configured to be provided in a second position, such that thefirst pump 20 recirculates the lubricant back to thetank 106, as shown inFIG. 12 . Alternatively, in some embodiments, the output from thefirst pump 20 may be designed to assist thesecond pump 30 in lubricating the transmission at the low pressure. - The
controller 104 is further configured to control the selective activation of thevalve 114 and thus use of the output from thefirst pump 20. - The first
epitrochoidal pump 20B may be used provide a vacuum, i.e., negative pressure or air, to any number of systems in a vehicle, e.g., a brake booster system, pneumatic actuators, and/or valves. Thesecond vane pump 30B may be used as an oil pump to supply pressurized lubricant to another system, e.g., to act as a booster for a circuit to an engine or transmission, to provide lubricant and/or cooling to a gearbox, to assist in clutch operation, and/or another smaller pump within a vehicle. - Accordingly, the
pump assemblies assemblies common wall 80 in that housing, thereby allowing for a more compact configuration and construction. As such, a larger space needed for mounting the disclosed pump assembly is not necessary. Further, fabrication and machining costs for forming thehousing 12 are reduced. Additionally, both pumps (20, 30) are driven via the same shaft 24 (whether of singular or connected construction) in thehousing 12. - When used in a system with a control valve, the output from the first pump may be limited. As such, the
pump assembly 10 and/or 10A and/or 10B may operate under a range of operating conditions or stages, including selective use of a high pressure/first pump when required. - While the principles of the disclosure have been made clear in the illustrative embodiments set forth above, it will be apparent to those skilled in the art that various modifications may be made to the structure, arrangement, proportion, elements, materials, and components used in the practice of the disclosure.
- It will thus be seen that the features of this disclosure have been fully and effectively accomplished. It will be realized, however, that the foregoing preferred specific embodiments have been shown and described for the purpose of illustrating the functional and structural principles of this disclosure and are subject to change without departure from such principles. Therefore, this disclosure includes all modifications encompassed within the spirit and scope of the following claims.
Claims (34)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/722,543 US20200208629A1 (en) | 2018-12-31 | 2019-12-20 | Pump assembly having two pumps provided in a single housing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201862786961P | 2018-12-31 | 2018-12-31 | |
US16/722,543 US20200208629A1 (en) | 2018-12-31 | 2019-12-20 | Pump assembly having two pumps provided in a single housing |
Publications (1)
Publication Number | Publication Date |
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US20200208629A1 true US20200208629A1 (en) | 2020-07-02 |
Family
ID=70469795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/722,543 Abandoned US20200208629A1 (en) | 2018-12-31 | 2019-12-20 | Pump assembly having two pumps provided in a single housing |
Country Status (9)
Country | Link |
---|---|
US (1) | US20200208629A1 (en) |
EP (1) | EP3903004A4 (en) |
JP (1) | JP2022515604A (en) |
KR (1) | KR20210108396A (en) |
CN (2) | CN211549977U (en) |
CA (1) | CA3124623A1 (en) |
DE (1) | DE202019107293U1 (en) |
MX (1) | MX2021007959A (en) |
WO (1) | WO2020141393A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11035362B2 (en) * | 2019-08-19 | 2021-06-15 | Progress Rail Locomotive Inc. | Oil pump for an aged engine |
US20210396245A1 (en) * | 2020-06-23 | 2021-12-23 | James D. Castillo | Centrifigal and inertial pump assembly |
US11421692B2 (en) * | 2019-07-25 | 2022-08-23 | Delta Electronics, Inc. | Water pump module |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2022515604A (en) * | 2018-12-31 | 2022-02-21 | スタックポール インターナショナル エンジニアード プロダクツ,リミテッド. | Pump assembly with two pumps housed in a single housing |
CN111577604A (en) * | 2020-06-24 | 2020-08-25 | 湖南腾智机电有限责任公司 | Series pump |
CN114198206B (en) * | 2020-09-18 | 2023-04-25 | 中国航发商用航空发动机有限责任公司 | Combined return oil pump of aero-engine and aero-engine comprising same |
CN112524020B (en) * | 2020-12-28 | 2024-03-19 | 合肥皖液液压元件有限公司 | High-pressure gear pump with large discharge capacity |
JP2022150294A (en) * | 2021-03-26 | 2022-10-07 | 日本電産トーソク株式会社 | electric pump |
WO2023134809A1 (en) * | 2022-01-12 | 2023-07-20 | Schaeffler Technologies AG & Co. KG | Tandem pump comprising a main flow and a dry sump flow |
CN115076105B (en) * | 2022-07-08 | 2023-11-24 | 浙江开放大学 | Cooling system flow booster pump and booster method |
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US4519755A (en) | 1980-05-09 | 1985-05-28 | Sargent-Welch Scientific Company | Gerotor vacuum pump |
US6386836B1 (en) * | 2000-01-20 | 2002-05-14 | Eagle-Picher Industries, Inc. | Dual gerotor pump for use with automatic transmission |
US20090041593A1 (en) | 2007-08-09 | 2009-02-12 | Kabushiki Kaisha Toyota Jidoshokki | Variable displacement type gear pump |
US20110129359A1 (en) | 2009-11-30 | 2011-06-02 | Caterpillar Inc. | Variable output pump |
CN101984257B (en) * | 2010-10-30 | 2012-03-28 | 辽宁工程技术大学 | Balanced type crescent seal gear pump |
JP2012207637A (en) * | 2011-03-30 | 2012-10-25 | Hitachi Automotive Systems Ltd | Electric oil pump |
CA2906303A1 (en) * | 2013-03-20 | 2014-09-25 | Magna Powertrain Inc. | Tandem electric pump |
AU2015292611B2 (en) * | 2014-07-22 | 2019-07-04 | Project Phoenix, LLC | External gear pump integrated with two independently driven prime movers |
US9771935B2 (en) | 2014-09-04 | 2017-09-26 | Stackpole International Engineered Products, Ltd. | Variable displacement vane pump with thermo-compensation |
US10030656B2 (en) | 2014-12-31 | 2018-07-24 | Stackpole International Engineered Products, Ltd. | Variable displacement vane pump with integrated fail safe function |
US9534519B2 (en) | 2014-12-31 | 2017-01-03 | Stackpole International Engineered Products, Ltd. | Variable displacement vane pump with integrated fail safe function |
US20170058895A1 (en) * | 2015-08-26 | 2017-03-02 | GM Global Technology Operations LLC | Dual pump system for automatic transmission augmentation, extended stop and start, and sailing |
KR102195233B1 (en) * | 2017-04-07 | 2020-12-28 | 스택폴 인터내셔널 엔지니어드 프로덕츠, 엘티디. | Epitrochoidal vacuum pump |
JP2022515604A (en) * | 2018-12-31 | 2022-02-21 | スタックポール インターナショナル エンジニアード プロダクツ,リミテッド. | Pump assembly with two pumps housed in a single housing |
-
2019
- 2019-12-19 JP JP2021534189A patent/JP2022515604A/en active Pending
- 2019-12-19 CA CA3124623A patent/CA3124623A1/en active Pending
- 2019-12-19 KR KR1020217021109A patent/KR20210108396A/en unknown
- 2019-12-19 MX MX2021007959A patent/MX2021007959A/en unknown
- 2019-12-19 WO PCT/IB2019/061144 patent/WO2020141393A1/en unknown
- 2019-12-19 EP EP19907328.9A patent/EP3903004A4/en not_active Withdrawn
- 2019-12-20 US US16/722,543 patent/US20200208629A1/en not_active Abandoned
- 2019-12-31 CN CN201922492750.6U patent/CN211549977U/en active Active
- 2019-12-31 DE DE202019107293.8U patent/DE202019107293U1/en active Active
- 2019-12-31 CN CN201911408796.3A patent/CN111379696A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11421692B2 (en) * | 2019-07-25 | 2022-08-23 | Delta Electronics, Inc. | Water pump module |
US11035362B2 (en) * | 2019-08-19 | 2021-06-15 | Progress Rail Locomotive Inc. | Oil pump for an aged engine |
US20210396245A1 (en) * | 2020-06-23 | 2021-12-23 | James D. Castillo | Centrifigal and inertial pump assembly |
Also Published As
Publication number | Publication date |
---|---|
CN211549977U (en) | 2020-09-22 |
DE202019107293U1 (en) | 2020-03-30 |
JP2022515604A (en) | 2022-02-21 |
WO2020141393A1 (en) | 2020-07-09 |
CN111379696A (en) | 2020-07-07 |
EP3903004A1 (en) | 2021-11-03 |
EP3903004A4 (en) | 2022-08-24 |
CA3124623A1 (en) | 2020-07-09 |
MX2021007959A (en) | 2021-08-11 |
KR20210108396A (en) | 2021-09-02 |
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