WO2011154852A1 - Pump group for a cooling circuit, in particular for a motorbike - Google Patents

Pump group for a cooling circuit, in particular for a motorbike Download PDF

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Publication number
WO2011154852A1
WO2011154852A1 PCT/IB2011/051172 IB2011051172W WO2011154852A1 WO 2011154852 A1 WO2011154852 A1 WO 2011154852A1 IB 2011051172 W IB2011051172 W IB 2011051172W WO 2011154852 A1 WO2011154852 A1 WO 2011154852A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
exit
obturator
pressure chamber
pump group
Prior art date
Application number
PCT/IB2011/051172
Other languages
French (fr)
Inventor
Fabio Saottini
Original Assignee
Industrie Saleri Italo S.P.A.
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 Industrie Saleri Italo S.P.A. filed Critical Industrie Saleri Italo S.P.A.
Priority to DE112011101949.1T priority Critical patent/DE112011101949B4/en
Publication of WO2011154852A1 publication Critical patent/WO2011154852A1/en

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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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves

Definitions

  • the present invention relates to a pump group for a cooling circuit, in particular for a motorbike.
  • the pump of a cooling circuit is connected upstream to an aspiration duct, from which it aspirates the cooling liquid, and downstream to a delivery duct, towards which the pressurised liquid is forwarded.
  • the pump works by means of an impeller, mechanically connected to the drive shaft so as to be placed in rotation .
  • the purpose of the present invention is to make, a pump group which overcomes the drawbacks spoken of.
  • FIG. 1 shows a view partially in cross-section of a pump group comprising an obturator device according to the present invention, according to one embodiment, in a configuration of maximum aperture towards the exit;
  • FIG. 1 shows the assembly in figure 1, in which the obturator device is in a configuration of maximum closure towards the exit;
  • FIG. 3 is an axonometric view of the obturator device according to the present invention
  • FIG. 4 is a view in longitudinal cross-section of the obturator device in figure 3;
  • figure 5 is a view in separate parts of the obturator device in figure 3.
  • a cooling system of a vehicle such as a motor cycle or motor vehicle, is connected to a thermal engine to cool it and comprises a radiator, for the cooling of the cooling liquid, a pump group 1, for the forced circulation of the cooling liquid, and a cooling circuit, which connects the pump group to the radiator and to the thermal engine.
  • the pump group 1 comprises an exit duct 2 for the supply of pressurised liquid downstream, for example to the thermal motor, and an entry duct,' for the entrance of the liquid upstream, for example coming from ; the radiator.
  • the pump group 1 comprises a pump fitted with an impeller 8.
  • the impeller 8 is connected by means of a shaft to the drive shaft, so as to be placed in rotation by it.
  • the pump further comprises a pump body 12, usually made in two half-bodies, provided with a pressure chamber 14 on the inside, inside which the impeller 8 is housed.
  • the pressure chamber 14 is connected upstream with the entry duct for the aspiration of the cooling liquid.
  • the pump body 12 further comprises a delivery duct 16, connected downstream of the pressure chamber 14, for the delivery of the pressurised liquid; the delivery duct 16 is, in addition, connectable downstream to the exit duct 2, to deliver the liquid to the thermal motor.
  • the delivery duct 16 is delimited by a right wall 16a, in the direction of advancement of the liquid towards the exit duct, and by a left wall 16b.
  • the pump group 1 further comprises a by-pass duct 20, which extends from a position downstream of the pressure chamber 14 and upstream of the exit duct 2 to a position upstream of the pressure chamber 14.
  • the left wall 16b is interrupted along the delivery duct 16, to form the mouth of. the by- pass duct 20.
  • the pump group 1 further comprises an obturator device 30, positioned at the fork between the exit duct 2 and the by-pass duct 20, suitable to reduce entirely or in part the liquid coming from the delivery duct 16 towards the exit duct 2 or towards the by-pass duct 20.
  • the obturator device 30 is sensitive to the effect of the liquid coming from the delivery duct 16 and is able to further narrow the passage towards the exit duct 2 proportionally to the pressure of said liquid.
  • the obturator device 30 comprises a valve body 32, preferably made from plastic material, for example in: a single piece, comprising a lower base 34 and an upper base 36, distanced along a main axis Z.
  • the lower base and the upper base are connected to each other by a column 38, preferably positioned eccentrically in relation to the bases 34, 36.
  • the upper base 36 comprises, proximally to the lower base, a shoulder 40 and a collar 42, projecting radially from the shoulder 40.
  • the shoulder 40 has at least one circumferential groove, for the insertion of a sealing ring 44.
  • the sealing ring 44 forms a static hydraulic seal, preventing the cooling liquid from seeping outwards .
  • the obturator device 30 comprises an obturator 50,. housed between the lower base 34 and the upper base 36, for example alongside the column 38, connected to said bases 34, 36 in a rotatable manner around said main axis Z.
  • the obturator 50 comprises an aperture wing 52 and a closure wing 54, joined to each other, preferably incident at right angles.
  • the wings 52, 54 have an L-shaped transversal cross-section, on an imaginary plane perpendicular to the main axis Z.
  • the aperture wing 52 has a free edge 56, distal from the portion attached to the closure wing, in which a breach 58 opens, in the form of a recess, passing through the thickness of the aperture wing.
  • the closure wing 54 moreover, has an inner surface 60, facing the aperture wing 52, and an outer surface 62 facing in the opposite direction.
  • the outer surface 62 is concave. .
  • the obturator device 30 comprises a stem 70 which extends axially between the bases .34, ' 36 coaxially to the main axis Z, to which the obturator is hinged.
  • the upper base 36 has a blind hole 36a accessible from the side facing the lower base 34 .and closed on the other side, which the stem 70 is inserted in .
  • the blind hole 36a has a lesser axial extension than the axial extension of the shoulder 40 of the upper base 36.
  • the lower base 34 has a through hole 34a, axially traversed by the stem 70.
  • the obturator device 30 comprises elastic return means able to permanently influence the obturator
  • the return means comprise a spring .80, for example a spring with coils wound along the main axis Z, inserted in the stem 70, and engaged on one side against the obturator 50, for example against one of said wings 52, 54 and on the other against a fixed abutment to the rotation of the obturator, for example the column 38 of the valve body 32.
  • a spring .80 for example a spring with coils wound along the main axis Z, inserted in the stem 70, and engaged on one side against the obturator 50, for example against one of said wings 52, 54 and on the other against a fixed abutment to the rotation of the obturator, for example the column 38 of the valve body 32.
  • the obturator 50 is rotatable, inserted the obturator device 30 in the pump body 12, between:
  • the aperture wing 52 partially obstructs the passage between the delivery duct 16 and the exit duct 2. Transit of the cooling liquid from the delivery duct 16 to the exit duct 2 is in any case ensured by the breach 58, which forms a calibrated aperture with the right wall 16a of the delivery duct 16.
  • the outer surface 62 of the closure wing 54 facilitates the action of the liquid on the closure wing towards the configuration of maximum closure .
  • the obturator 50 tends to rotate, until it reaches the configuration of maximum closure.
  • the division makes it possible to reduce the downstream pressure of the obturator device.
  • the shape of the outer surface 62 of the closure wing 54 facilitates the deviation of the liquid wing towards the by-pass duct 20.
  • the pump group according to the present invention makes it possible to reduce the pressure in the cooling circuit at high revs of the motor, automatically adjusting itself as the revs of the motor decrease, in a particularly efficient and reliable manner .
  • the obturator device according to the present invention can be made as a single group separate from the rest of the pump group, and inserted in the pump body during the assembly phase.
  • the obturator device is of the cartridge type.
  • the obturator device does not envisage dynamic seals, in that there are no rotating parts projecting from the upper base.
  • the sealing ring as per the description in fact forms a static seal.
  • the flow of cooling liquid towards the exit duct is defined, by virtue of the breach which forms a calibrated aperture.
  • the obturator is particularly sensitive to increases in the pressure . of the liquid, by virtue of the shape of the outer surface of the closure wing and the projection of the same into the delivery duct.
  • the obturator device is self- regulating in closure and aperture, in that the obturator is sensitive to the increase or decrease of the pressure of the liquid.
  • the pump is of the electric type, that is to sa activated by an electric motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

A pump group (1) for a cooling circuit, in particular for motorcycles, motor vehicles and similar, comprising a pump. (1), a by-pass duct (20) and a self-regulating obturator device (30), positioned at the fork between the exit duct (2) and the by-pass duct (20). The obturator device is of the cartridge type.

Description

DESCRIPTION
"Pump group for a cooling circuit, in particular for a motorbike"
[0001] The present invention relates to a pump group for a cooling circuit, in particular for a motorbike.
[0002] In a different sector of the art, that is that of heating systems, the pump group as described in DE 15 28 843 is known, in which however the obturator device is manually operated.
[0003] The pump of a cooling circuit is connected upstream to an aspiration duct, from which it aspirates the cooling liquid, and downstream to a delivery duct, towards which the pressurised liquid is forwarded. The pump works by means of an impeller, mechanically connected to the drive shaft so as to be placed in rotation .
[0004] It follows that at a low number of revs of the motor, the speed of rotation of the impeller is also low, while the flow of cooling liquid needed for the correct functioning of the system must be high; the pump is therefore designed so that at a low number of revs of the motor, it satisfies the flow requisites needed to cool the motor correctly.
[0005] It follows that at a high number of revs of the motor, corresponding to a high number of revs of the impeller, the pressure of the cooling liquid is very high, with considerable drawbacks in terms of stress on the components of the cooling system.
[0006] This problem is particularly felt in the sector of cooling pumps for motorbikes which notoriously envisage extremely high speeds of rotation of the drive shaft, if compared to those reached by the drive shaft of a vehicle.
[0007] The purpose of the present invention is to make, a pump group which overcomes the drawbacks spoken of.
[0008] Such purpose is achieved by a pump group according to. claim 1.
[0009] The characteristics and advantages of the pump group according to the present invention, will be evident from the description below, made by way of a non-limiting example with reference to the attached drawings, wherein:.
[0010] - figure 1 shows a view partially in cross-section of a pump group comprising an obturator device according to the present invention, according to one embodiment, in a configuration of maximum aperture towards the exit;
[001 1] - figure 2 shows the assembly in figure 1, in which the obturator device is in a configuration of maximum closure towards the exit;
[0012] - figure 3 is an axonometric view of the obturator device according to the present invention; [0013] - figure 4 is a view in longitudinal cross-section of the obturator device in figure 3; and
[0014] - figure 5 is a view in separate parts of the obturator device in figure 3.
[0015] A cooling system of a vehicle, such as a motor cycle or motor vehicle, is connected to a thermal engine to cool it and comprises a radiator, for the cooling of the cooling liquid, a pump group 1, for the forced circulation of the cooling liquid, and a cooling circuit, which connects the pump group to the radiator and to the thermal engine.
[0016] In particular, the pump group 1 comprises an exit duct 2 for the supply of pressurised liquid downstream, for example to the thermal motor, and an entry duct,' for the entrance of the liquid upstream, for example coming from; the radiator.
[0017] The pump group 1 comprises a pump fitted with an impeller 8. Preferably, the impeller 8 is connected by means of a shaft to the drive shaft, so as to be placed in rotation by it.
[0018] The pump further comprises a pump body 12, usually made in two half-bodies, provided with a pressure chamber 14 on the inside, inside which the impeller 8 is housed.
[0019] The pressure chamber 14 is connected upstream with the entry duct for the aspiration of the cooling liquid. [0020] The pump body 12 further comprises a delivery duct 16, connected downstream of the pressure chamber 14, for the delivery of the pressurised liquid; the delivery duct 16 is, in addition, connectable downstream to the exit duct 2, to deliver the liquid to the thermal motor.
[0021] The delivery duct 16 is delimited by a right wall 16a, in the direction of advancement of the liquid towards the exit duct, and by a left wall 16b.
[0022] The pump group 1 further comprises a by-pass duct 20, which extends from a position downstream of the pressure chamber 14 and upstream of the exit duct 2 to a position upstream of the pressure chamber 14.
[0023] In other words, the left wall 16b is interrupted along the delivery duct 16, to form the mouth of. the by- pass duct 20.
[0024] The pump group 1 further comprises an obturator device 30, positioned at the fork between the exit duct 2 and the by-pass duct 20, suitable to reduce entirely or in part the liquid coming from the delivery duct 16 towards the exit duct 2 or towards the by-pass duct 20.
[0025] The obturator device 30 is sensitive to the effect of the liquid coming from the delivery duct 16 and is able to further narrow the passage towards the exit duct 2 proportionally to the pressure of said liquid.
[0026] Further details of the functioning of the obturator device 30 are contained in the Italian patent application BS2010A000036 in the Applicant's name. r
[0027] The obturator device 30 comprises a valve body 32, preferably made from plastic material, for example in: a single piece, comprising a lower base 34 and an upper base 36, distanced along a main axis Z.
[0028] The lower base and the upper base are connected to each other by a column 38, preferably positioned eccentrically in relation to the bases 34, 36.
[0029] The upper base 36 comprises, proximally to the lower base, a shoulder 40 and a collar 42, projecting radially from the shoulder 40.
[0030] The shoulder 40 has at least one circumferential groove, for the insertion of a sealing ring 44.
[0031] When the obturator device 30 is inserted in the pump body 12, the sealing ring 44 forms a static hydraulic seal, preventing the cooling liquid from seeping outwards .
[0032] Furthermore, the obturator device 30 comprises an obturator 50,. housed between the lower base 34 and the upper base 36, for example alongside the column 38, connected to said bases 34, 36 in a rotatable manner around said main axis Z.
[0033] The obturator 50 comprises an aperture wing 52 and a closure wing 54, joined to each other, preferably incident at right angles. In other words, the wings 52, 54 have an L-shaped transversal cross-section, on an imaginary plane perpendicular to the main axis Z.
[0034] Preferably, the aperture wing 52 has a free edge 56, distal from the portion attached to the closure wing, in which a breach 58 opens, in the form of a recess, passing through the thickness of the aperture wing.
[0035] The closure wing 54, moreover, has an inner surface 60, facing the aperture wing 52, and an outer surface 62 facing in the opposite direction.
[0036] Preferably, the outer surface 62 is concave. .
[0037] Moreover, the obturator device 30 comprises a stem 70 which extends axially between the bases .34, '36 coaxially to the main axis Z, to which the obturator is hinged.
[0038] Preferably, the upper base 36 has a blind hole 36a accessible from the side facing the lower base 34 .and closed on the other side, which the stem 70 is inserted in .
[0039] Preferably, the blind hole 36a has a lesser axial extension than the axial extension of the shoulder 40 of the upper base 36.
[0040] Preferably, rather, the lower base 34 has a through hole 34a, axially traversed by the stem 70.
[0041] Moreover, the obturator device 30 comprises elastic return means able to permanently influence the obturator
50. . . . . ...
[0042] Preferably, the return means comprise a spring .80, for example a spring with coils wound along the main axis Z, inserted in the stem 70, and engaged on one side against the obturator 50, for example against one of said wings 52, 54 and on the other against a fixed abutment to the rotation of the obturator, for example the column 38 of the valve body 32.
[0043] The obturator 50 is rotatable, inserted the obturator device 30 in the pump body 12, between:
[0044] - a position of maximum aperture towards the exit wherein the passage between the delivery duct 16 and the by-pass duct 20 is obstructed by the closure wing 54, which is next to or abuts with the left wall 16b of the delivery duct 16, so that the passage opening between ,the delivery duct 16 and the by-pass duct 20 is minimum; the obturator device 30 thus assumes the configuration of maximum aperture (figure 1); and
[0045] - a position, of maximum closure towards the exit, wherein the passage between the delivery duct 16 and the by-pass duct 2 is obstructed by the closure wing 54, which is next to or abuts with the right wall 16a of the delivery duct 16, so that the passage opening between the delivery duct 16 and the by-pass duct 20 is maximum; the obturator device 30 thus assumes the configuration of maximum closure (figure 2) .
[0046] In the configuration of maximum aperture, wherein the passage opening between the delivery duct 16 and the by-pass duct 20 is minimal, the aperture wing 52 partially obstructs the passage between the delivery duct 16 and the exit duct 2. Transit of the cooling liquid from the delivery duct 16 to the exit duct 2 is in any case ensured by the breach 58, which forms a calibrated aperture with the right wall 16a of the delivery duct 16.
[0047] As the number of revs of the motor increases, the speed of rotation of the impeller increases and therefore the pressure of the cooling liquid which, passing from the delivery duct to the exit duct, strikes both the aperture wing 52 and the closure wing 54, partially projecting into the delivery duct 16 even in the configuration of maximum aperture of the obturator device 30.
[0048] Advantageously, the outer surface 62 of the closure wing 54 facilitates the action of the liquid on the closure wing towards the configuration of maximum closure .
[0049] The obturator 50 tends to rotate, until it reaches the configuration of maximum closure.
[0050] In the configuration of maximum closure, wherein the passage between the delivery duct 16 and the by-pass duct 20 is at its maximum, a residual flow of cooling liquid exists in any case which transits from the delivery duct 16 to the exit duct 2, despite the passage opening formed between the free edge of the closure wing 5 and the right wall 16a of the delivery duct 16 being minimal.
[0051] The division makes it possible to reduce the downstream pressure of the obturator device.
[0052] Advantageously, moreover, the shape of the outer surface 62 of the closure wing 54 facilitates the deviation of the liquid wing towards the by-pass duct 20.
[0053] As the number of revs of the motor decreases, the speed of rotation of the impeller decreases and therefore the pressure of the cooling liquid on the obturator, which tends to return, under the permanent effect of the return means, from the configuration of maximum closure to the configuration of maximum aperture.
[0054] Innovatively, the pump group according to the present invention makes it possible to reduce the pressure in the cooling circuit at high revs of the motor, automatically adjusting itself as the revs of the motor decrease, in a particularly efficient and reliable manner .
[0055] Advantageously, moreover, the obturator device according to the present invention, can be made as a single group separate from the rest of the pump group, and inserted in the pump body during the assembly phase. The obturator device is of the cartridge type.
[0056] According to a further advantageous aspect, the obturator device does not envisage dynamic seals, in that there are no rotating parts projecting from the upper base. The sealing ring as per the description in fact forms a static seal.
[0057] According to yet a further advantageous aspect, in the configuration of maximum aperture, the flow of cooling liquid towards the exit duct is defined, by virtue of the breach which forms a calibrated aperture.
[0058] Advantageously, moreover, the obturator is particularly sensitive to increases in the pressure . of the liquid, by virtue of the shape of the outer surface of the closure wing and the projection of the same into the delivery duct.
[0059] In other words, the obturator device is self- regulating in closure and aperture, in that the obturator is sensitive to the increase or decrease of the pressure of the liquid.
[0060] It is clear that a person skilled in the aft may make modifications to the pump group described above so as to satisfy contingent requirements.
[0061] For example, the pump, according to one embodiment variation, is of the electric type, that is to sa activated by an electric motor.
[0062] Such variations also fall within the sphere of protection as defined by the following claims.

Claims

Claims
1. Pump group (1) for a cooling circuit, in particular for motorcycles, motor vehicles and similar, comprising:
- a pump (1) fitted with an impeller (14) housed in a pressure chamber (14);
- an entrance duct upstream of the pressure chamber (14) for the aspiration of the liquid and an exit duct (2) downstream of the pressure chamber (14) for forwarding the pressurised liquid;
- a by-pass duct (20) which connects a position downstream of the pressure chamber (14) and upstream of the exit duct (2) with a position upstream of the pressure chamber (14);
- a self-regulating obturator device ( 30 ), positioned at the fork between the exit duct (2) and the by-pass duct
(20), suitable to further narrow the passage towards the exit duct (2) when the action of the liquid coming from the pressure chamber (14) increases;
wherein the obturator device is of the cartridge type.
2. Pump group according to claim 1, wherein the obturator device comprises return means able to permanently influence the obturator device from the configuration of maximum closure to the configuration of maximum aperture.
3. Pump group according to claim 2, wherein the obturator device (30) comprises: - a valve body (32) comprising a lower base (34) and an upper base (36)., axially distanced along a main axis (Z) , connected by a column (38);
- an obturator (50) positioned between the bases (34, 36), hinged to the main axis (Z); and
- said return means, positioned between the bases (34, 36) , able to permanently influence the obturator.
4. Pump group according to claim 3, comprising a sealing ring (44) and wherein the upper base (36) has an annular groove in which said ring is housed to form a static seal between the obturator device and a pump body (12) which it is inserted in.
5. Pump group according to claim 2 or 3 or 4, wherein the return means comprise a spring (80) with coils wound along the main axis (Z), assembled coaxially to said axis and engaged with the obturator and with a fixed abutment to the rotation of the obturator, for example the column (38) of the valve body (32).
6. Pump group according to any of the claims from 3 to 5, wherein the upper base (36) has a blind hole (36a) accessible from the side facing the lower base (34) and closed on the other side, for the insertion of a stem (70) for hinging the obturator (50).
7. Pump group according to claim 6, wherein the lower base (34) has a through hole (34a) for inserting said stem.
8. Pump group according to any of the previous claims,, wherein the obturator device comprises an obturator (.50) which, under the effect of the circulating coolant liquid, is able to pass from a configuration of maximum aperture towards the exit wherein the passage opening between the delivery duct (16) and the by-pass duct (20) is minimal, to a configuration of maximum closure towards the exit.
9. Pump group according to claim 8, wherein the obturator (50) comprises an aperture wing (52) and a closure wing (54), formed by walls joined and incident to each other. :
10. Pump group according to claim 9, wherein, in the configuration of maximum aperture towards the exit, the passage from the delivery duct (16) to the exit duct (2) is at least partially obstructed by the aperture wing (52) and the closure wing (54) projects at least partially into the delivery duct (16), said wings thereby being struck by the coolant liquid.
11. Pump group according to claim 9 or 10, wherein the aperture wing (52) comprises at least one breach (58) passing through its thickness.
12. Pump group according to claim 11, wherein the breach (58) is made at the free edge (56) of the aperture wing (56).
13. Pump group according to any of the claims from 10 to
12, wherein in the configuration of maximum closure towards the exit, the passage from the delivery duct (16) to the exit duct (2) is partially obstructed by the closure wing (54) .
14. Pump group according to any of the claims from 9 to
13, wherein the closure wing has a concave outer surface (62) .
15. Pump group according to any of the previous claims, wherein the impeller can be mechanically connected to the drive shaft .
16. Pump group (1) for a cooling circuit, in particular for motorcycles, motor vehicles and similar, comprising:
- a pump (1) fitted with an impeller (14) housed in a pressure chamber (14);
- an entrance duct upstream of the pressure chamber (14) for the aspiration of the liquid and an exit duct (2) downstream of the pressure chamber (14) for forwarding the pressurised liquid;
- a by-pass duct (20) which connects a position downstream of the pressure chamber (14) and upstream of the exit duct (2) with a position upstream of the pressure chamber (14);
- a self-regulating obturator device (30), positioned at the fork between the exit duct (2) and the by-pass duct (20), suitable to further narrow the passage towards the exit duct (2) when the action of the liquid coming from the pressure chamber (14) increases, wherein the obturator device (30) comprises an . obturator (50) which comprises an aperture wing (52) and a closure wing (54), formed. by walls joined and incident to each other;
wherein the obturator (50), under the effect of the circulating coolant liquid, is able to pass from a configuration of maximum aperture towards the exit, wherein the passage opening between the delivery duct (16) and the by-pass duct (20) is minimal, to a configuration of maximum closure towards the exit and wherein, in the configuration of maximum aperture towards the exit, the passage from the delivery duct (16) to the exit duct (2) is at least partially obstructed by the aperture, wing (52) and the closure wing (54) projects at least partially into the delivery duct (16) , said wings thereby being struck by the coolant liquid.
17. Pump group (1) for a cooling circuit, in particular for motorcycles, motor vehicles and similar, comprising: - a pump (1) comprising an impeller (8) and a pump body (12), provided internally with a pressure chamber (14), inside which the impeller is housed (8), wherein the pump body (12) comprises a delivery duct (16), connected downstream of the pressure chamber (14), defined by a wall (16a, 16b) ; .
- an entrance duct upstream of the pressure chamber (14) for the aspiration of the liquid and an exit duct (2) downstream of the pressure chamber (14) and of the delivery duct (16) for forwarding the pressurised liquid;
- a by-pass duct (20) which connects a position downstream of the pressure chamber (14) and upstream Of the exit duct (2) with a position upstream of the pressure chamber (14);
- a self-regulating obturator device (30), downstream of the delivery duct and upstream of the exit duct (2) and by-pass duct (20), positioned at the fork between the exit duct (2) and the by-pass duct (20), suitable to further narrow the passage towards the exit duct (2) when the action of the liquid coming from the pressure chamber (14) increases, wherein the obturator device comprises an obturator (50) which, under the effect of the circulating coolant liquid, is able to pass from a configuration of maximum aperture towards the exit wherein the passage opening between the delivery duct (16) and the by-pass duct (20) is minimal, to a configuration of maximum closure towards the exit,
wherein the obturator (50) comprises an aperture wing (52) which has at least one breach (58) passing through its thickness for the coolant liquid circulating in the configuration of maximum aperture towards the exit.
18. Pump group according to claim 17, wherein the breach (58) is delimited by a portion of the wall (16a, 16b) of the pump body (12).
PCT/IB2011/051172 2010-06-08 2011-03-21 Pump group for a cooling circuit, in particular for a motorbike WO2011154852A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112011101949.1T DE112011101949B4 (en) 2010-06-08 2011-03-21 Pump group for a cooling circuit, in particular for a motorcycle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBS2010A000104 2010-06-08
ITBS2010A000104A IT1400369B1 (en) 2010-06-08 2010-06-08 PUMP UNIT FOR COOLING CIRCUIT, IN PARTICULAR FOR A MOTORCYCLE.

Publications (1)

Publication Number Publication Date
WO2011154852A1 true WO2011154852A1 (en) 2011-12-15

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DE (1) DE112011101949B4 (en)
IT (1) IT1400369B1 (en)
WO (1) WO2011154852A1 (en)

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JPS4988166U (en) * 1972-10-30 1974-07-31
JPH0255824A (en) * 1988-08-22 1990-02-26 Aisan Ind Co Ltd Cooling water pump for vehicle
JPH04365912A (en) * 1991-06-14 1992-12-17 Isuzu Motors Ltd Pressure regulator for oil pump
JPH08100620A (en) * 1994-09-30 1996-04-16 Suzuki Motor Corp Lubricating device for engine
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JP2015507137A (en) * 2012-02-14 2015-03-05 ピールブルグ パンプ テクノロジー ゲゼルシャフト ミット ベシュレンクテル ハフツングＰｉｅｒｂｕｒｇ Ｐｕｍｐ Ｔｅｃｈｎｏｌｏｇｙ ＧｍｂＨ Mechanical coolant pump
JP2015507138A (en) * 2012-02-14 2015-03-05 ピールブルグ パンプ テクノロジー ゲゼルシャフト ミット ベシュレンクテル ハフツングＰｉｅｒｂｕｒｇ Ｐｕｍｐ Ｔｅｃｈｎｏｌｏｇｙ ＧｍｂＨ Mechanical coolant pump
US9689392B2 (en) 2012-02-14 2017-06-27 Pierburg Pump Technology Gmbh Mechanical coolant pump
US9689393B2 (en) 2012-02-14 2017-06-27 Pierburg Pump Technology Gmbh Mechanical coolant pump
US9726178B2 (en) 2012-02-14 2017-08-08 Pierburg Pump Technology Gmbh Mechanical coolant pump

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IT1400369B1 (en) 2013-05-31
ITBS20100104A1 (en) 2011-12-09
DE112011101949T5 (en) 2013-03-28

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