GB2239049A - A pump assembly - Google Patents

A pump assembly Download PDF

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Publication number
GB2239049A
GB2239049A GB8927092A GB8927092A GB2239049A GB 2239049 A GB2239049 A GB 2239049A GB 8927092 A GB8927092 A GB 8927092A GB 8927092 A GB8927092 A GB 8927092A GB 2239049 A GB2239049 A GB 2239049A
Authority
GB
United Kingdom
Prior art keywords
pump assembly
shaft
casing
rotor
rotors
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.)
Granted
Application number
GB8927092A
Other versions
GB2239049B (en
GB8927092D0 (en
Inventor
Richard Huish Spray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MG Rover Group Ltd
Original Assignee
MG Rover Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MG Rover Group Ltd filed Critical MG Rover Group Ltd
Priority to GB8927092A priority Critical patent/GB2239049B/en
Publication of GB8927092D0 publication Critical patent/GB8927092D0/en
Publication of GB2239049A publication Critical patent/GB2239049A/en
Application granted granted Critical
Publication of GB2239049B publication Critical patent/GB2239049B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps

Abstract

The assembly has a casing (11) defining first and second working chambers (14, 15) each of which has a respective rotor (25, 26) associated with it. A shaft (20) is rotatably supported by the casing (11) and is adapted near one end to be driven by a source of motive power and at the other end to drive the second rotor (26) by means of a tongue and groove arrangement (40). The self contained second working chamber (15) is formed by an end portion (13) of the casing (11) and an end plate (31) secured together. The second working chamber (15) and the second rotor (26) are removable from the casing (11) without disturbing the first working chamber (14). <IMAGE>

Description

A PUMP ASSEMBLY This invention relates to pumps and in particular to auxillary pumps for motor vehicles.
It is known for example from GB 2205611-A to provide for the engine of a motor vehicle a coolant pump to circulate coolant through the engine combined with a high pressure oil pump to provide a source of high pressure oil for a power steering actuating mechanism. Such a pump has the advantage that the number of auxillary belts required to drive the water pump and high pressure oil pump are reduced to one.
It is an object of this invention to provide an improved form of pump assembly.
According to the invention there is provided a pump assembly comprising a casing defining two working chambers, each of which has a respective inlet and outlet means associated therewith, a shaft rotatably supported by the casing and adapted near one end to be driven by a source of motive power, sealing means interposed between adjacent working chambers to prevent fluid transfer therebetween and a like number of rotors as there are working chambers, each rotor cooperating with the working chamber in which it is located to provide an independent pump unit, the rotors being driveable by said shaft wherein a first of said rotors is driveably mounted on the shaft and the second of said rotors is driveably connected to the shaft at the other end by drive means.
Preferably, the drive means is a tongue and groove drive means.
The second rotor may be radially located by means of a hollow sleeve located on the shaft.
Advantageously the second working chamber may be formed by an end portion of the casing and an end plate secured together.
Preferably, the end portion may be releasably secured to a body portion of the casing.
The end plate may support a seal for the second working chamber.
The hollow sleeve may have a flange used to control the end float of the second rotor.
The flange may be positioned between two thrust bearings one of which is supported by the end plate and the other of which is supported by an end cap fastened to the end plate.
With reference to Figure 1 there is shown a pump assembly for an internal combustion engine of a motor vehicle.
The pump assembly comprises a casing 11 defining first and second working chambers 14 and 15 each of which has a respective inlet and outlet means 16, 18 and 17, 19 associated therewith.
The casing 11 has a body portion 12 and an end portion 13 secured to the body portion 12 by number of circumferentially spaced bolts 5.
A shaft 20 is rotatably supported by means of first and second plane bearings 21 and 22 located one on each side of a first rotor 25 and a ball bearing 23 located near to one end of the shaft 20.
The shaft 20 has the first rotor 25 mounted thereon for rotation therewith and is driveably connected to a second rotor 26 by means of a tongue and groove drive 40.
The body portion 12 has a stepped bore into which is fitted a plate 30 to form the first working chamber 14 in which is located the first rotor 25.
The plate 30 is retained in the stepped bore of the body portion 12 by means of a snap ring 36.
Sealing means 27, 28 are interposed between the first and second working chambers 14, 15 to prevent fluid transfer therebetween.
Vent means in the form of a hole 35 through a side wall of the body portion 12 and a hole 29 in an end plate 31 are provided to prevent a build up of pressure between the seals 27, 28 and to allow any fluid which should escape from the first and second working chambers 14 and 15 to drain away.
Furthermore, as the pressure between the seals 27,28 is maintained at or below the pressure in either of the working chambers 14, 15 the risk of leakage from one of the working chambers to the other is reduced to a minimum.
The second working chamber 15 is formed by the end portion 13 and the end plate 31 which are secured together by clips 32.
An annular seal 39 is interposed between the end portion 13 and the end plate 31 to prevent leakage from the second working chamber 15.
The second rotor 26 is radially located by a hollow sleeve 37 which is push fitted into a boss 10.
The hollow sleeve 37 is located by the shaft 20 and has a flange 38 to control the end float of the second rotor 26.
The flange 38 is positioned between two thrust bearings 2,3 one of which is supported by the end plate 31 and the other of which is supported by an end cap 33 fixed the the end plate 31.
The shaft 20 has a threaded bore 24 at one end used to attach a pulley (not shown) to the shaft 20.
The pulley is driven by a belt (not shown) from a further pulley attached to the end of the crankshaft of the engine (not shown).
The first rotor 25 defines in combination with the first working chamber 14 a positive displacement pump.
Rotation of the shaft 20 will cause oil to be drawn from a reservoir (not shown) through the inlet means 16 and a passage 34 in the plate 30 and to supply oil at high pressure through the outlet means 17 to a device requiring a source of oil at high pressure such as a power steering actuator.
Rotation of the shaft 20 is transmitted to the second rotor 26 via the slot and tongue drive 40.
Rotation of the second rotor 26 which defines in combination with the second working chamber 15 a centrifugal pump will cause fluid to be drawn in via the inlet means 18 and to be discharged at increased pressure through the outlet means 19.
It will be appreciated that the centrifugal pump is a completly self contained unit and can be removed without disturbing the bearings 21, 22, 23 or seal 27 of the high pressure positive displacement pump or removing the positive displacement pump itself from the vehicle.
Furthermore, a pump assembly according to this invention has the advantage that the centrifugal and positive displacement pumps can be tested separately which allows pumps from different suppliers to be more readily used.
Reference in the description to a positive displacement pump includes any known type of positive displacement pump such as by eccentric rotor, sliding vane, gear pumps and roller pumps.

Claims (9)

1. A pump assembly comprising a casing defining two working chambers, each of which has a respective inlet and outlet means associated therewith, a shaft rotatably supported by the casing and adapted near one end to be driven by a source of motive power, sealing means interposed between adjacent working chambers to prevent fluid transfer therebetween and a like number of rotors as there are working chambers, each rotor cooperating with the working chamber in which it is located to provide an independent pump unit, the rotors being driveable by said shaft wherein a first of said rotors is driveably mounted on the shaft and the second of said rotors is driveably connected to the shaft at the other end by drive means.
2. A pump assembly as claimed in claim 1 in which the drive means is a tongue and groove drive means.
3. A pump assembly as claimed in claim 1 or in claim 2 in which the second rotor is radially located by means of a hollow sleeve located on the shaft.
4. A pump assembly as claimed in any of claims 1 to 3 in which the second working chamber is formed by an ehd portion of the casing and an end plate secured togther.
5. A pump assembly as claimed in claim 4 in which the end portion is releasably secured to a body portion of the casing.
6. A pump assembly as claimed in claim 4 or in claim 5 in which the end plate supports a seal for the second working chamber.
7. A pump assembly as claimed in any of claims 4 - 6 in which the hollow sleeve has a flange used to control the end float of the second rotor.
8. A pump assembly as claimed in claim 7 in which the flange is positioned between two thrust bearings one of which is supported by the end plate and the other of which is supported by an end cap fastened to the end plate.
9. A pump assembly substantially as described herein with reference to the accompanying drawing.
GB8927092A 1989-11-30 1989-11-30 A pump assembly Expired - Fee Related GB2239049B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8927092A GB2239049B (en) 1989-11-30 1989-11-30 A pump assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8927092A GB2239049B (en) 1989-11-30 1989-11-30 A pump assembly

Publications (3)

Publication Number Publication Date
GB8927092D0 GB8927092D0 (en) 1990-01-31
GB2239049A true GB2239049A (en) 1991-06-19
GB2239049B GB2239049B (en) 1993-11-24

Family

ID=10667202

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8927092A Expired - Fee Related GB2239049B (en) 1989-11-30 1989-11-30 A pump assembly

Country Status (1)

Country Link
GB (1) GB2239049B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351322A (en) * 1999-06-23 2000-12-27 Concentric Pumps Ltd Pump housing for a coolant pump and a lubricant pump

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB280779A (en) * 1927-03-23 1927-11-24 Irving Callender Jennings Wet vacuum pumping apparatus
GB285663A (en) * 1927-03-14 1928-02-23 Nash Engineering Corp Improvement in universal coupling
GB350551A (en) * 1930-03-14 1931-06-15 Drysdale & Co Ltd Improvements in and relating to combined water and air pump units
GB463208A (en) * 1935-12-02 1937-03-24 Drysdale & Co Ltd Improved pumping unit
GB2093530A (en) * 1981-02-19 1982-09-02 Dewandre Co Ltd C Rotary fluid pumps
US4695232A (en) * 1983-04-07 1987-09-22 Flutec Fluidtechinische Gerate Gmbh Central body to which are connected both a driving motor and a pump
EP0268835A2 (en) * 1986-11-27 1988-06-01 INDUSTRIE ZANUSSI S.p.A. Pump unit, particularly for dishwashers
GB2205611A (en) * 1987-06-09 1988-12-14 Austin Rover Group A pump assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892967A (en) * 1959-02-12 1962-04-04 Fisher & Ludlow Ltd Improvements in or relating to rotary impeller pumps for liquids

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB285663A (en) * 1927-03-14 1928-02-23 Nash Engineering Corp Improvement in universal coupling
GB280779A (en) * 1927-03-23 1927-11-24 Irving Callender Jennings Wet vacuum pumping apparatus
GB350551A (en) * 1930-03-14 1931-06-15 Drysdale & Co Ltd Improvements in and relating to combined water and air pump units
GB463208A (en) * 1935-12-02 1937-03-24 Drysdale & Co Ltd Improved pumping unit
GB2093530A (en) * 1981-02-19 1982-09-02 Dewandre Co Ltd C Rotary fluid pumps
US4695232A (en) * 1983-04-07 1987-09-22 Flutec Fluidtechinische Gerate Gmbh Central body to which are connected both a driving motor and a pump
EP0268835A2 (en) * 1986-11-27 1988-06-01 INDUSTRIE ZANUSSI S.p.A. Pump unit, particularly for dishwashers
GB2205611A (en) * 1987-06-09 1988-12-14 Austin Rover Group A pump assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351322A (en) * 1999-06-23 2000-12-27 Concentric Pumps Ltd Pump housing for a coolant pump and a lubricant pump

Also Published As

Publication number Publication date
GB2239049B (en) 1993-11-24
GB8927092D0 (en) 1990-01-31

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940224