EP1213481B1 - Rotary pump with a variable flow rate, particularly for oil - Google Patents
Rotary pump with a variable flow rate, particularly for oil Download PDFInfo
- Publication number
- EP1213481B1 EP1213481B1 EP01128459A EP01128459A EP1213481B1 EP 1213481 B1 EP1213481 B1 EP 1213481B1 EP 01128459 A EP01128459 A EP 01128459A EP 01128459 A EP01128459 A EP 01128459A EP 1213481 B1 EP1213481 B1 EP 1213481B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheels
- pump according
- support body
- pump
- constraint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims 2
- 230000007423 decrease Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
Definitions
- the present invention relates to a rotary pump with a variable flow rate, and in particular to a gear pump as specified in the preamble of claim 1.
- a gear pump is for oil, known eg from any of GB-A-1152188 or BE-A-443167 .
- a gear pump comprises a support body, which delimits a suction mouth, which, in use, is connected to an oil tank, and a delivery mouth, which, in use, is connected to a delivery circuit, and accommodates two toothed rotors which engage with one another, and delimit a plurality of apertures, in order to convey oil from the suction mouth to the delivery mouth.
- the known gear pumps of the above-described type are used for example in motor vehicles, in order to convey the oil to the lubrication circuit of a corresponding internal combustion engine, the drive shaft of which actuates one of the rotors of the pump, and thus sets the speed of rotation of the rotors themselves.
- the known pumps of the above-described type are provided with a corresponding by-pass valve, which can recirculate the excess oil from the delivery mouth to the tank, according to the pressure present in the delivery circuit.
- the known pumps of the above-described type are unsatisfactory, since the oil which is recirculated through the by-pass valve is compressed by the pump, which thus absorbs corresponding mechanical compression energy from the engine shaft, without this energy then being actually used.
- GB-A-1152188 discloses a rotary positive-displacement pump, which has externally-meshing gears. A piston is provided to move a gear relative to another meshing gear, thereby varying the output of the pump in response to the actual oil pressure at the pressure side of the gears.
- BE-A-443167 discloses a hydraulic circuit having a similar pump. According to a variation, BE-A-443167 also discloses a pump and a motor provided in a single hydraulic device having a drive shaft and an output shaft, which are coaxial and engage respective groups of gears forming part of a row of axially fixed gears. The input and output shafts are axially slidable to engage a greater or a lower number of gears, in order to vary the angular speed of the output shaft.
- the object of the present invention is to provide a rotary pump with a variable flow rate, particularly for oil, which makes it possible to solve the above-described problems simply and economically.
- a rotary pump with a variable capacity, particularly for oil, is provided, as defined in claim 1.
- FIG. 1 illustrates a pump with a variable flow rate, in particular a pump which can be fitted in a motor vehicle (not illustrated), in order to convey oil to a lubrication circuit of an internal combustion engine (not illustrated) of the motor vehicle itself.
- the pump 1 is of the gear type, and comprises a support body 2, which can be connected integrally, in a manner which is known and is not described in detail, to a portion of the engine, and has a suction mouth 3 ( Figure 2) which can be connected to an oil tank (not illustrated), and a delivery mouth 4, which can be connected to the lubrication or delivery circuit.
- the body 2 delimits a cavity 5, which communicates with the exterior by means of the mouths 3 and 4, and accommodates two sets 6 and 7 of wheels respectively 10 and 11, which are toothed on the exterior.
- the wheels 10, 11 of each set 6, 7 are superimposed on one another along respective axes 12 and 13, which are parallel to one another, and each engage with a corresponding wheel 11, 10 of the other set.
- the wheels 10, 11 all have the same axial thickness, they are disposed in fixed axial positions, and can rotate around the corresponding axes 12 and 13, in order to convey oil from the mouth 3 to the mouth 4 by means of a plurality of compartments 14, which are delimited by the body 2 and by the wheels 10, 11 themselves.
- the wheels 11 are keyed in an idle manner onto a cylindrical pin 15 ( Figure 2) which is connected to the body 2, whereas at least some of the wheels 10 are rotated by a coaxial shaft 16, which is connected to the body 2, in a fixed axial position and in a rotary manner.
- the shaft 16 comprises an external end section 17, onto which there is keyed, in a fixed position, a gear 18 which is actuated by a drive shaft (not illustrated) of the motor vehicle, by means of a chain (not illustrated) which is wound around the gear 18 itself.
- the shaft 16 additionally comprises a grooved end section (not visible), onto which there is keyed a coaxial body 20, which is in the shape of a cup, and is connected to the grooved section itself in a manner which is axially sliding and angularly fixed.
- the body 20 is delimited externally by a lateral surface 21, which has two flattened parts 22, it is complementary to through axial seats 23 provided in the wheels 10, and engages the seats 23 themselves in a manner which is axially sliding and angularly fixed.
- the body 20 constitutes part of a regulation unit 25, in order to vary the flow rate of the pump 1 according to the delivery pressure of the oil.
- the unit 25 also comprises a pin 26 which is coaxial relative to the body 20, disposed on the side opposite the shaft 16, and comprises an axial end 27, which abuts the body 20, has in transverse cross-section the same outer profile as the body 20, and comprises two integral projections 28, which are opposite the body 20 itself.
- the pin 26 defines the mobile unit of a single-effect hydraulic actuator 29, which constitutes part of the unit 25, and comprises a pre-loaded spring 30, which is interposed axially between the body 20 and an axial shoulder 31 of the shaft 16.
- the actuator 29 additionally comprises a control chamber 32, which is provided in a hollow portion 33, which, in its interior, has a transverse cross-section which is complementary to that of the end 27, is delimited by the end 27 itself, and communicates with the mouth 4 via a duct 34.
- the pin 26 is angularly fixed, and slides axially in a manner sealed against fluids, under the action of the pressure in the chamber 32, in order to thrust the body 20 against the resilient action of the spring 30.
- the pump 1 additionally comprises a hydraulic accumulator device 35, which in turn comprises a cylindrical cavity 36 provided in the body 2 along an axis 38.
- the cavity 36 is engaged in a manner which is axially sliding and sealed against fluids, by a plate 39, which, on opposite axial sides, delimits two chambers 40 and 41, of which the chamber 40 has a variable volume, and communicates with the mouth 4 via a passage not illustrated, whereas the chamber 41 is preferably put into communication with the tank, and accommodates a pre-loaded spring 42, which is interposed axially between the plate 39 itself and a fixed stop ring 43.
- the plate 39 is subject to the opposing thrusts of the pressure in the chamber 40 and the resilient action of the spring 42, in order to transfer oil between the chamber 40 and the mouth 4, according to the delivery pressure, and to compensate for any variations in the delivery pressure itself.
- a groove 45 which also imparts to the device 35 the function of a safety by-pass valve.
- the spring 42 is compressed progressively by the plate 39, and the volume of the chamber 40 increases to a limit value which corresponds to a maximum delivery pressure level, when the chamber 40 enters into communication with the groove 45, and the oil flows from the chamber 40 towards the exterior.
- the resilient action of the spring 30 maintains the body 20 and the pin 26 in a position of end of travel, in which the projections 28 are supported against a base wall of the chamber 32, and the pin 26 is disconnected from the wheels 10, whereas the body 20 is connected to all the wheels 10, and rotates fully the sets 6 and 7, which thus define respectively the drive and driven rotors of the pump 1.
- the flow rate of the pump 1 increases, such that the delivery pressure also increases.
- the pressure in the chamber 32 reaches a threshold value which is dependent on the pre-loading by the spring 30, the pin 26 and the body 20 move axially against the action of the spring 30 itself. During this displacement, the body 20 becomes detached from some wheels 10, whereas simultaneously, the pin 26 engages the seats 23 of the wheels 10, which are left free by the body 20.
- the pin 26 and the body 20 withdraw under the thrust of the spring 30, such that the body 20 engages with other wheels 10, so that the number of wheels of the part A and the volume of the compartments 14 increase, whereas the number of wheels of the part B decreases.
- the unit 25 regulates the number of wheels 10 and 11 which belong to the parts A and B of the sets 6 and 7, and thus, the axial thickness of the drive and driven rotors, which are actually defined by the rotary part A of the sets 6 and 7 themselves.
- the unit 25 varies the axial dimension of the mobile compartments 14, the volume of which is proportional to the flow rate of oil distributed by the pump 1.
- the pin 26 prevents this part B from being driven by friction by the part A.
- the flow rate is regulated accurately, since the sets 6, 7 comprise a relatively large number of wheels 10, 11, which have the same axial thickness, and, simultaneously, the unit 25 is very simple and compact.
- the device 35 makes it possible to compensate for any temporary and relatively sudden drops and peaks of pressure in the delivery circuit, and, simultaneously, to allow oil to be vented when the delivery pressure reaches a maximum safety level.
- the pump 1 could be of the lobe type instead of of the gear type, and/or it could be used for applications other than that indicated.
- the number and dimensions of the wheels 10 and 11, and the shape of the pin 26 and of the body 20 could be different from those illustrated, and/or a drive other than of the chain type could be provided.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Fats And Perfumes (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2000TO001133A ITTO20001133A1 (it) | 2000-12-05 | 2000-12-05 | Pompa rotativa a portata variabile, particolarmente per olio. |
ITTO001133 | 2000-12-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1213481A1 EP1213481A1 (en) | 2002-06-12 |
EP1213481B1 true EP1213481B1 (en) | 2007-12-05 |
Family
ID=11458264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01128459A Expired - Lifetime EP1213481B1 (en) | 2000-12-05 | 2001-12-05 | Rotary pump with a variable flow rate, particularly for oil |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1213481B1 (es) |
DE (1) | DE60131721T2 (es) |
ES (1) | ES2296701T3 (es) |
IT (1) | ITTO20001133A1 (es) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE443167A (es) * | ||||
DE511495C (de) * | 1928-03-01 | 1930-10-30 | Valentin Retterath | Fluessigkeitsgetriebe |
GB490963A (en) * | 1937-05-21 | 1938-08-24 | John Burgoyne Pillin | Improvements relating to rotary pumps |
GB1152188A (en) * | 1966-09-15 | 1969-05-14 | Tozaburo Kuhara | A Rotary Fluid Pump or Motor |
-
2000
- 2000-12-05 IT IT2000TO001133A patent/ITTO20001133A1/it unknown
-
2001
- 2001-12-05 DE DE60131721T patent/DE60131721T2/de not_active Expired - Lifetime
- 2001-12-05 ES ES01128459T patent/ES2296701T3/es not_active Expired - Lifetime
- 2001-12-05 EP EP01128459A patent/EP1213481B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITTO20001133A1 (it) | 2002-06-05 |
EP1213481A1 (en) | 2002-06-12 |
DE60131721D1 (de) | 2008-01-17 |
ITTO20001133A0 (it) | 2000-12-05 |
ES2296701T3 (es) | 2008-05-01 |
DE60131721T2 (de) | 2008-11-06 |
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