EP1647713B1 - Fluid pumping apparatus with Helmholtz-resonator - Google Patents
Fluid pumping apparatus with Helmholtz-resonator Download PDFInfo
- Publication number
- EP1647713B1 EP1647713B1 EP05109513.1A EP05109513A EP1647713B1 EP 1647713 B1 EP1647713 B1 EP 1647713B1 EP 05109513 A EP05109513 A EP 05109513A EP 1647713 B1 EP1647713 B1 EP 1647713B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resonator
- pump
- pump body
- pumping apparatus
- cover
- 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.)
- Not-in-force
Links
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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
- F04C15/0049—Equalization of pressure pulses
-
- 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
-
- 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
- F04C2240/50—Bearings
- F04C2240/56—Bearing bushings or details thereof
-
- 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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/13—Noise
Definitions
- the present invention relates to a pumping apparatus for fluids, in particular oil.
- a pressure oscillation or so-called “ripple” is also produced, caused by the successive meshing of the gear teeth, in case the pump is a gear type pump. This "ripple" produces vibrations along the oil line and, hence, noise.
- the line must therefore be fitted with a device for damping vibration within the frequency range of the pump.
- the pump If powered by an internal combustion engine to pump oil to various external user devices (e.g. hydraulic steering, hydraulic actuators, etc.), the pump is also known to vary its speed as a function of engine speed, again causing vibrations.
- various external user devices e.g. hydraulic steering, hydraulic actuators, etc.
- vibration is damped using a resonator with a damping peak of around 2000 rpm, but which at the same time also provides for acceptable damping of vibration slightly above or slightly below this value.
- a good resonator can damp vibrations ranging between 20% above and 20% below its rated design frequency.
- the geometry of the resonator can also be altered so that it effectively damps only one frequency or a range of frequencies. In the latter case, however, efficiency is reduced as compared to a resonator which operates best with only one rated design frequency.
- a Helmholtz resonator may be formed by a tube coaxial with another tube forming part of the oil circuit.
- the inner tube, in which the oil flows, has at least one hole connected to the outer tubular resonator to fill the resonator chamber with oil, which remains stationary inside the chamber.
- the stationary oil in the resonator chamber and the rigidity of the oil in the through hole act as a "mass-spring" system to damp vibration (and noise) produced by the pump.
- the resonator Given the high pressures (as much as 200 bar) operating in the hydraulic systems in which it is installed, and the extensive surface area of the resonator, considerable forces are produced which the resonator, separate from the pump, must be able to withstand. As such, it must be mechanically strong enough. In addition, the resonator furthermore must be rigid enough to prevent its walls from flexing and initiating resonance phenomena which would defeat the purpose of the resonator itself.
- a Helmholtz resonator in the pump itself, to eliminate or at least reduce structural noise transmission as well. Since a normal gear pump, for example, has two covers “sandwiching" the component parts of the pump, integrating the Helmholtz resonator in one of the pump covers is a valid solution. Such an integrated resonator is described in GB-B-2.319.564 . In this arrangement, the resonator chamber is connected to the outlet port of the pump and thus is not immediately effective in the area where the vibrations are generated. Moreover, substantive modifications of the pump body itself are required to adapt it to the cover in which the resonator chamber is incorporated. More specifically, apart from a supply channel inbetween the outlet port and the resonator chamber, additional seals around the supply channel are required to avoid leakage of oil inbetween the pump body and the cover holding the resonator chamber.
- Number 10 in Figure 1 indicates a pump forming part of a pumping apparatus (shown only partly) which is the main object of the present invention.
- pump 10 is a gear pump for pumping oil.
- variable-eccentricity vane pumps e.g. variable-eccentricity vane pumps
- pump 10 comprises a one-piece pump body 11 advantageously, though not necessarily, extruded from metal, in particular aluminium.
- Pump body 11 comprises a casing 12 defining two communicating inner cavities 13a, 13b ( Figure 2 ).
- Casing 12 has four longitudinal through holes 12a for the purpose explained in detail below.
- Cavities 13a, 13b house respective rotors 14, 15 meshing with each other.
- rotor 14 is fitted to a drive shaft 16 driven around a longitudinal axis (a), and rotor 15 is driven, in use, by rotor 14.
- Rotor 15 is connected to a shaft 17, having a longitudinal axis (b) parallel to axis (a).
- Pump body 11 has an intake opening 18 ( Figure 2 ) and an opposite delivery opening 19.
- the wall of casing 12, in which opening 19 is formed, has a number of holes 19a ( Figure 2 ) for screwing on a delivery conduit (not shown) using known means, the conduit being connected to the hydraulic circuit.
- Opening 18 has similar holes (not shown in Figure 2 ) for connecting an intake conduit (equally not shown).
- the fluid being pumped in particular oil, is therefore drawn in, by rotation of rotors 14, 15, through intake opening 18 in known manner not described herein, and is pumped into the hydraulic circuit connected to delivery opening 19.
- Cavities 13a and 13b in pump body 11 house a first bearing 20 and a second bearing 21.
- First bearing 20 has two seats 20a, 20b for housing, in use, a portion 16a of shaft 16 and a portion 17a of shaft 17 respectively.
- second bearing 21 (on the opposite side of rotors 14, 15) has two seats 21a, 21b for housing, in use, a portion 16b of shaft 16 and a portion 17b of shaft 17 respectively.
- Cover 22 is of conventional design, and comprises a main body 22a, in which an opening 22b is formed through which an end 16c of shaft 16 protrudes (as best seen in Figure 1 ). End 16c is connected mechanically to drive means (not shown) for rotating rotor 14 (and therefore also rotor 15 meshing with rotor 14) to pump the fluid as required.
- Four holes 25 are formed at the four corners of cover 22 to fix pump 10 to a support (not shown).
- Cover 22 also has four dead holes (not shown) for a purpose explained in detail below.
- a conventional elliptical seal is provided around the cavities 13a, 13b for sealing against a flat face of cover 22.
- An identically shaped seal is provided on the rear face of pump body 11, to seal against cover 23.
- cover 23 is located on the opposite side of pump body 11 and is shown in more detail in Figure 3 .
- cover 23 houses a Helmholtz resonator 100 for damping at the outset any annoying vibration and relative noise produced in pump 10 by the fluid-pumping action of rotors 14 and 15.
- Cover 23 comprises a main body 23a, in turn comprising four longitudinal through holes 23b, and a chamber 26 communicating with the outside solely through a hole 27 (see also Figure 2 ).
- Chamber 26 and hole 27 substantially define Helmholtz resonator 100.
- the oil for filling chamber 26 flows through hole 27, which, in use, communicates hydraulically with cavities 13a, 13b and is located on the delivery opening 19 side of pump 10.
- the location of hole 27 is chosen such that it is directed to the pressurized area of the pump 10, in the vicinity of the point where the teeth of rotors 14 and 15 mesh. Hydraulic communication between this area and the hole 27 is guaranteed between the nip of the side surface of bearing 20 and its associated seat in the pump body 11.
- bearing 20 is formed by two semi-circular parts which are placed onto each other, thereby adopting a figure eight configuration.
- Seats 13a and 13b for their larger part obviously are also semi-circular but in contrast with bearing 20 have a transition area which is somewhat truncated, thereby forming a flat surface connection, as best seen in figure 2 .
- the small channel formed inbetween this flat surface and the outer surface of bearing 20 is advantageously employed to hydraulically connect resonator 100 to the pressurized side of pump 10, thus eliminating the need for drilling any additional connecting channels in the pump body 11.
- a Helmholtz resonator 100 is thus integrated in pump 10 to damp, at the outset, vibrations produced by the teeth of the two meshing rotors 14 and 15.
- each through hole 23b and a corresponding through hole 12a (both having a longitudinal axis (c) parallel to axes (a) and (b)) receive a respective bolt 28 (only two shown in Figure 1 ), the free end of which is screwed inside the corresponding dead hole (not shown) in cover 22.
- One-piece pump body 11, the two bearings 20 and 21, and the two rotors 14 and 15 are thus "sandwiched" between covers 22 and 23, the latter having a Helmholtz resonator 100 in accordance with the invention.
- a second Helmholtz resonator may obviously also be provided in cover 22, or in any convenient portion of one-piece pump body 11, without departing from the scope of the present invention.
Description
- The present invention relates to a pumping apparatus for fluids, in particular oil.
- As is known, a common problem in automotive oil pumping equipment is noise, mainly caused by irregular pressure generated by the pumps in the hydraulic circuits. To eliminate the drawbacks caused by noise-generating variations in pressure in the hydraulic circuits, external cascade filters (e.g "reactive type" filters such as a Helmholtz resonator, which uses a gas damper, or "passive type" filters as throttles, section variations etc.) are normally installed separately from the pump along the oil line.
- If the user device calls for e.g. 10 bar pressure, in addition to the 10 bars generated by the pump, a pressure oscillation or so-called "ripple" is also produced, caused by the successive meshing of the gear teeth, in case the pump is a gear type pump. This "ripple" produces vibrations along the oil line and, hence, noise.
- The line must therefore be fitted with a device for damping vibration within the frequency range of the pump.
- If powered by an internal combustion engine to pump oil to various external user devices (e.g. hydraulic steering, hydraulic actuators, etc.), the pump is also known to vary its speed as a function of engine speed, again causing vibrations.
- Laboratory tests show that, in the case of pumps mounted on farm machinery engines, most noise is produced in the 1500-2200 rpm range.
- In most applications, vibration is damped using a resonator with a damping peak of around 2000 rpm, but which at the same time also provides for acceptable damping of vibration slightly above or slightly below this value. On average, a good resonator can damp vibrations ranging between 20% above and 20% below its rated design frequency.
- The geometry of the resonator can also be altered so that it effectively damps only one frequency or a range of frequencies. In the latter case, however, efficiency is reduced as compared to a resonator which operates best with only one rated design frequency.
- In known systems of this sort, a Helmholtz resonator may be formed by a tube coaxial with another tube forming part of the oil circuit. The inner tube, in which the oil flows, has at least one hole connected to the outer tubular resonator to fill the resonator chamber with oil, which remains stationary inside the chamber. The stationary oil in the resonator chamber and the rigidity of the oil in the through hole act as a "mass-spring" system to damp vibration (and noise) produced by the pump.
- Given the high pressures (as much as 200 bar) operating in the hydraulic systems in which it is installed, and the extensive surface area of the resonator, considerable forces are produced which the resonator, separate from the pump, must be able to withstand. As such, it must be mechanically strong enough. In addition, the resonator furthermore must be rigid enough to prevent its walls from flexing and initiating resonance phenomena which would defeat the purpose of the resonator itself.
- To reduce the size of the filter, it is often necessary to adopt a small tube section, thus resulting in load loss along the line.
- Since noise can be transmitted through air or structures, it is preferred to integrate a Helmholtz resonator in the pump itself, to eliminate or at least reduce structural noise transmission as well. Since a normal gear pump, for example, has two covers "sandwiching" the component parts of the pump, integrating the Helmholtz resonator in one of the pump covers is a valid solution. Such an integrated resonator is described in
GB-B-2.319.564 - It is therefore an object of the present invention to provide a pumping apparatus for fluids, in particular oil, designed to eliminate the aforementioned drawbacks.
- According to the present invention, there is provided a pumping apparatus for fluids, in particular oil, as defined in Claim 1.
- A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
-
Figure 1 shows an assembly drawing of a pump forming part of the fluid pumping apparatus (shown only partly) which is the main object of the present invention; -
Figure 2 shows an exploded view of theFigure 1 pump; and -
Figure 3 shows a cover of theFigure 1-2 pump, in which a Helmholtz resonator is integrated according to the invention. -
Number 10 inFigure 1 indicates a pump forming part of a pumping apparatus (shown only partly) which is the main object of the present invention. In the non-limiting embodiment shown purely by way of example in the accompanying drawings,pump 10 is a gear pump for pumping oil. - As will be clear to anyone skilled in the art, however, what is said in the following disclosure also applies to other types of pumps (e.g. variable-eccentricity vane pumps) and to any type of fluid, provided the geometry of the filter-resonator is designed accordingly.
- As shown in detail in the exploded view in
Figure 2 ,pump 10 comprises a one-piece pump body 11 advantageously, though not necessarily, extruded from metal, in particular aluminium.Pump body 11 comprises acasing 12 defining two communicatinginner cavities Figure 2 ).Casing 12 has four longitudinal throughholes 12a for the purpose explained in detail below.Cavities respective rotors - As shown in
Figure 2 ,rotor 14 is fitted to adrive shaft 16 driven around a longitudinal axis (a), androtor 15 is driven, in use, byrotor 14.Rotor 15 is connected to ashaft 17, having a longitudinal axis (b) parallel to axis (a). -
Pump body 11 has an intake opening 18 (Figure 2 ) and an opposite delivery opening 19. The wall ofcasing 12, in which opening 19 is formed, has a number ofholes 19a (Figure 2 ) for screwing on a delivery conduit (not shown) using known means, the conduit being connected to the hydraulic circuit.Opening 18 has similar holes (not shown inFigure 2 ) for connecting an intake conduit (equally not shown). - The fluid being pumped, in particular oil, is therefore drawn in, by rotation of
rotors delivery opening 19. -
Cavities pump body 11 house a first bearing 20 and a second bearing 21. First bearing 20 has twoseats portion 16a ofshaft 16 and aportion 17a ofshaft 17 respectively. Similarly, second bearing 21 (on the opposite side ofrotors 14, 15) has twoseats portion 16b ofshaft 16 and aportion 17b ofshaft 17 respectively. - As shown in
Figure 2 , in use,rotors shafts bearings cavities pump body 11 by twocovers -
Cover 22 is of conventional design, and comprises amain body 22a, in which an opening 22b is formed through which anend 16c ofshaft 16 protrudes (as best seen inFigure 1 ).End 16c is connected mechanically to drive means (not shown) for rotating rotor 14 (and therefore alsorotor 15 meshing with rotor 14) to pump the fluid as required. Fourholes 25 are formed at the four corners ofcover 22 to fixpump 10 to a support (not shown).Cover 22 also has four dead holes (not shown) for a purpose explained in detail below. - As schematically shown on the front face of the
pump body 11, a conventional elliptical seal is provided around thecavities cover 22. An identically shaped seal is provided on the rear face ofpump body 11, to seal againstcover 23. - The
innovative cover 23 is located on the opposite side ofpump body 11 and is shown in more detail inFigure 3 . As will be seen,cover 23 houses a Helmholtzresonator 100 for damping at the outset any annoying vibration and relative noise produced inpump 10 by the fluid-pumping action ofrotors -
Cover 23 comprises amain body 23a, in turn comprising four longitudinal throughholes 23b, and achamber 26 communicating with the outside solely through a hole 27 (see alsoFigure 2 ).Chamber 26 andhole 27 substantially define Helmholtzresonator 100. The oil forfilling chamber 26 flows throughhole 27, which, in use, communicates hydraulically withcavities pump 10. The location ofhole 27 is chosen such that it is directed to the pressurized area of thepump 10, in the vicinity of the point where the teeth ofrotors hole 27 is guaranteed between the nip of the side surface of bearing 20 and its associated seat in thepump body 11. It indeed will be observed that bearing 20 is formed by two semi-circular parts which are placed onto each other, thereby adopting a figure eight configuration.Seats figure 2 . The small channel formed inbetween this flat surface and the outer surface ofbearing 20 is advantageously employed to hydraulically connectresonator 100 to the pressurized side ofpump 10, thus eliminating the need for drilling any additional connecting channels in thepump body 11. - A Helmholtz
resonator 100 is thus integrated inpump 10 to damp, at the outset, vibrations produced by the teeth of the twomeshing rotors - In actual use (
Figure 1 ), each throughhole 23b and a corresponding throughhole 12a (both having a longitudinal axis (c) parallel to axes (a) and (b)) receive a respective bolt 28 (only two shown inFigure 1 ), the free end of which is screwed inside the corresponding dead hole (not shown) incover 22. - One-
piece pump body 11, the twobearings rotors Helmholtz resonator 100 in accordance with the invention. - A second Helmholtz resonator may obviously also be provided in
cover 22, or in any convenient portion of one-piece pump body 11, without departing from the scope of the present invention. - The advantages of the pumping apparatus according to the present invention are as follows:
- integration within the pump structure itself of a device for suppressing vibration- and noise-induced disturbance;
- direct intervention inside the compartment in which fluid flow and pressure are generated, thus attenuating disturbance as of the outset and so preventing structural vibration transmission;
- suppression of load losses in the fluid circuit;
- no need to change the cross section of the tubes downstream from the pump - unlike conventional pumping systems, in which the Helmholtz resonator is located along the fluid line - thus also eliminating the need for additional fittings;
- vibration is damped over the full rotation speed range of the pump (from 1000 to 3000 rpm);
- substantial saving, by not having to provide a resonator separate from the pump;
- easier installation of the pump inside the vehicle engine compartment, e.g. by eliminating the space required for the resonator; moreover, it is not always possible to install the resonator in the most technically advantageous position; in fact, if the resonator is positioned wrongly, an air pocket forms inside, and this must be expelled through a bleed hole; since, however, operators frequently forget to bleed the resonator, thus leaving air trapped inside which seriously impairs the efficiency of the resonator, designers must devise an assembly position in which the resonator is always full of stationary oil; space and position problems sometimes prevent installation of Helmholtz resonators (as, for example, on small special-purpose tractors), thus impairing silent operation of the system;
- the solution proposed in the present invention eliminates the need for high-cost machining of gear pump teeth to prevent vibration of the pump as much as possible;
- no need for any modifications to existing pump bodies, as oil supply channels from the pump outlet conduit towards the resonator chamber are not required; furthermore, since the resonator communicates with the pump body through a channel closely parallel to the outer surface of the rotor bearings (i.e. emerging interiorly of the conventional seal between the pump body and the associated cover), no additional seals or redesign of conventional seals is needed.
- All this allows easy retrofitting of new covers incorporating the resonator to existing pump bodies, without having to perform any modifications at all to the pump bodies. Moreover, one cover easily may be substituted by another cover having a different thickness, and therefore a different volume inside the resonator chamber, to adapt the system to a predominant frequency to be damped.
Claims (2)
- A pumping apparatus for fluids, in particular oil, the pumping apparatus (10) comprising :- a pump body (11);- fluid propelling means (14, 15) enclosed in said pump body (11);- a hydraulic circuit connected hydraulically to said pump body (11);- a Helmholtz resonator (100) for damping vibration generated by said fluid propelling means (14, 15); said resonator being integrated in at least one cover (22, 23) of said pumping apparatus (10); wherein said Helmholtz resonator (100) is in direct fluid communication with the pressurized side of the fluid propelling means (14, 15); wherein said Helmholtz resonator (100) comprises a chamber (26) and a hole (27) connecting said chamber (26) to the pump body (11); said fluid propelling means comprising meshing rotors (14, 15) and said hole (27) being oriented towards the area where the rotors (14, 15) mesh; andcharacterized in that the rotors (14, 15) are supported by at least one bearing (20, 21) housed in a seat (13a, 13b) of said pump body (11); a gap inbetween said seat (13a, 13b) and said at least one bearing (20, 21) forming a channel for hydraulically connecting said hole (27) of the resonator (100) to the pressurized side of the pumping apparatus (10).
- A pumping apparatus according to claim 1, characterized in that the pump body (11) comprises at least one elliptically shaped seal, provided closely around the confines of said seat (13a, 13b) for cooperation with said at least one cover (22, 23) to hydraulically seal the pumping apparatus (10); said hole (27) in said at least one cover (22, 23), when mounted on the pump body (11), being located within the confines of said seal.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO20040639 ITBO20040639A1 (en) | 2004-10-15 | 2004-10-15 | PUMPING DEVICE FOR LIQUIDS, IN PARTICULAR FOR OIL |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1647713A2 EP1647713A2 (en) | 2006-04-19 |
EP1647713A3 EP1647713A3 (en) | 2012-10-24 |
EP1647713B1 true EP1647713B1 (en) | 2018-12-12 |
Family
ID=35539636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05109513.1A Not-in-force EP1647713B1 (en) | 2004-10-15 | 2005-10-13 | Fluid pumping apparatus with Helmholtz-resonator |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1647713B1 (en) |
IT (1) | ITBO20040639A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007020002B4 (en) * | 2007-04-27 | 2018-10-04 | Trw Automotive Gmbh | gear pump |
AT507087B1 (en) * | 2008-12-05 | 2010-02-15 | Siemens Vai Metals Tech Gmbh | METHOD AND DEVICE FOR THE SEMI-ACTIVE REDUCTION OF PRESSURE VIBRATIONS IN A HYDRAULIC SYSTEM |
DE102017206360B4 (en) * | 2017-04-13 | 2022-05-19 | Conti Temic Microelectronic Gmbh | Housing for a pneumatic control unit and pneumatic control unit |
CN109209865B (en) * | 2018-11-21 | 2023-08-01 | 太原科技大学 | Shaft sleeve and method for inhibiting noise of gear pump |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9314146U1 (en) * | 1993-09-18 | 1995-01-26 | Sihi Gmbh & Co Kg | Liquid ring gas pump |
JPH1082385A (en) * | 1996-09-09 | 1998-03-31 | Ishikawajima Harima Heavy Ind Co Ltd | Casing structure of lysholm compressor |
IT241428Y1 (en) | 1996-11-22 | 2001-05-09 | Casappa Spa | REDUCED PRESSURE PULSE HYDRAULIC PUMP. |
DE19818141C2 (en) * | 1998-04-23 | 2003-04-30 | Trw Fahrwerksyst Gmbh & Co | Method for limiting the pressure provided by a hydraulic pump and hydraulic pump for carrying out the method |
KR100286837B1 (en) * | 1998-07-15 | 2001-05-02 | 구자홍 | Resonator of a rotary compressor |
JP2000320479A (en) * | 1999-05-12 | 2000-11-21 | Mitsubishi Electric Corp | Multi-cylinder enclosed type compressor |
DE20302535U1 (en) * | 2003-02-17 | 2003-06-18 | Trw Fahrwerksyst Gmbh & Co | Hydraulic pump for a power steering system |
-
2004
- 2004-10-15 IT ITBO20040639 patent/ITBO20040639A1/en unknown
-
2005
- 2005-10-13 EP EP05109513.1A patent/EP1647713B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP1647713A3 (en) | 2012-10-24 |
ITBO20040639A1 (en) | 2005-01-15 |
EP1647713A2 (en) | 2006-04-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5791309A (en) | Balancer shaft supporting structure in engine | |
EP2275682B1 (en) | Oil supplying apparatus for engine | |
KR101628674B1 (en) | Motor-pump assembly | |
EP1647713B1 (en) | Fluid pumping apparatus with Helmholtz-resonator | |
JP2001317320A (en) | Lubricating device for internal combustion engine | |
JPH11315784A (en) | Hydraulic machinery | |
CN109058115B (en) | Screw compressor slide valve with airflow pulsation attenuation function | |
KR101133300B1 (en) | Rotary compressor | |
KR850001182Y1 (en) | Hermetic compressor | |
JP4224378B2 (en) | Oil pump | |
JP2006517634A (en) | Compound pump | |
JP2009036137A (en) | Variable displacement vane pump | |
US6305919B1 (en) | Hydraulic pump housing with an integral dampener chamber | |
EP0828079B1 (en) | Lysholm compressors | |
KR100213983B1 (en) | Screw vacuum pump | |
KR101948228B1 (en) | Gerotor pump having separation plate integrated with housing | |
EP0768465A1 (en) | Gas compressor | |
US20050106044A1 (en) | Oil pump | |
EP2140141B1 (en) | Dual stage pump having intermittent mid-shaft load supports | |
JP5607492B2 (en) | Negative pressure pump | |
JP4755456B2 (en) | Oil pump | |
KR100343891B1 (en) | Combining structure of isolator and holder of fuel pump motor for automobiles | |
KR102529520B1 (en) | Vacuum Pump for Vehicle | |
JPH1047259A (en) | Oil pump of internal combution engine | |
JP5313860B2 (en) | Screw compressor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL MK |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CNH ITALIA S.P.A. |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CNH ITALIA S.P.A. |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL MK |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: F04C 29/06 20060101ALI20120918BHEP Ipc: F04C 15/00 20060101AFI20120918BHEP Ipc: F04C 2/18 20060101ALI20120918BHEP Ipc: F01C 21/02 20060101ALI20120918BHEP |
|
17P | Request for examination filed |
Effective date: 20130424 |
|
AKX | Designation fees paid |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
17Q | First examination report despatched |
Effective date: 20130730 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CNH INDUSTRIAL ITALIA S.P.A. |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20180516 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1076378 Country of ref document: AT Kind code of ref document: T Effective date: 20181215 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602005055127 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190312 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1076378 Country of ref document: AT Kind code of ref document: T Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190313 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190412 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20190412 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602005055127 Country of ref document: DE |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
26N | No opposition filed |
Effective date: 20190913 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20191029 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20191009 Year of fee payment: 15 Ref country code: FR Payment date: 20191026 Year of fee payment: 15 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20191025 Year of fee payment: 15 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191031 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191013 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191031 |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20191031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191013 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602005055127 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20181212 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20201013 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20051013 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210501 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20201031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20201013 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20201013 |