EP4350144A1 - Hydraulische kolbenpumpe und verfahren zur beeinflussung des klangverlaufs der kolbenpumpe - Google Patents
Hydraulische kolbenpumpe und verfahren zur beeinflussung des klangverlaufs der kolbenpumpe Download PDFInfo
- Publication number
- EP4350144A1 EP4350144A1 EP22200010.1A EP22200010A EP4350144A1 EP 4350144 A1 EP4350144 A1 EP 4350144A1 EP 22200010 A EP22200010 A EP 22200010A EP 4350144 A1 EP4350144 A1 EP 4350144A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- pistons
- piston pump
- hydraulic
- hydraulic piston
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 16
- 230000005540 biological transmission Effects 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2078—Swash plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2035—Cylinder barrels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/001—Noise damping
Definitions
- the present invention relates to a hydraulic piston pump and a method for affecting the sound character of the piston pump.
- the hydraulic piston pump is primarily intended to be used in an electric vehicle, where an internal combustion engine does not hide the sound emitted from the piston pump.
- Heavy machines such as trucks of different types, construction equipment machines and the likes are often provided with additional hydraulic equipment powered by a hydraulic pump.
- the hydraulic pump is often referred to as a power take-off (PTO) and is often mounted to an engine or a transmission of the vehicle or machine.
- the interface for the power take-off is normally standardized such that an additional power take-off can be mounted when required.
- An engine and/or a transmission may be provided with one or more locations where a PTO can be mounted.
- the hydraulic pump will emit a specific noise that is dependent e.g. on the number of pistons, the size of the hydraulic pump and the actual delivered pressure or flow from the hydraulic pump.
- the noise emitted from the hydraulic pump is normally partly masked by the noise emitted from the internal combustion engine of the vehicle or machine, especially since a higher power output from the hydraulic pump is obtained by a higher engine speed, and thus a higher engine noise, and the sound character of the hydraulic pump follows the sound and rotational speed of the internal combustion engine.
- the sound masking property of the combustion is removed, and other sound sources become more pronounced.
- the substitution sound with electric motors is more silent and has much weaker sound masking properties.
- the noise emitted from the hydraulic pump becomes more noticeable.
- the noise emitted from the hydraulic pump have some prominent frequencies linked to the number of pistons of the pump and the rotational speed of the pump. These specific frequencies with overtones may become more annoying or disturbing than the well-known sound from a combustion engine.
- some noise is desirable in order for a user to receive feedback from the operation in question. This feedback is essential for the operator when performing work tasks.
- An object of the invention is therefore to provide an improved hydraulic piston pump.
- a further object of the invention is to provide a method for affecting the emitted sound character from a hydraulic piston pump.
- a further object of the invention is to provide a vehicle comprising such a hydraulic piston pump.
- the object of the invention is achieved in that at least one piston is arranged to deliver a specific pressure or output flow that differs from the pressure or output flow delivered by the other pistons.
- the sound emitted from a hydraulic piston pump is provided with a base frequency that is dependent on the rotational speed of the hydraulic piston pump.
- the pistons will emit a base tone having a specific amplitude and harmonic overtones.
- the shape of the emitted sound will depend on e.g. the delivered pressure and the shape of the piston/cylinder cavity.
- the impulses from the pistons repeat the same number of times per rotation as the number of pistons in the hydraulic piston pump. This cause there to be a clear, well separated, tone at the frequency of the impulses and harmonic overtones will appear at multiples of this frequency.
- the frequency distance between these multiple harmonic tones is the same as the frequency of the fundamental tone of the impulses.
- the output pressure from all the pistons differs from each other. For a hydraulic piston pump having seven pistons, this will give seven different pressure impulses that will superimpose. The time signal from one rotation become unique, but repeat itself for the coming rounds, and cause a fundamental frequency equal to the rotation speed.
- the output pressure from three of the pistons differs from the other.
- three pistons may have one size and four may have another size.
- the emitted pressure impulses from the pistons will superimpose and will give a different sound than from a hydraulic piston pump where all pistons are identical.
- the output pressure or output flow from a piston can be altered in different ways. In all cases, the size of the compressed volume by the piston and/or the pressure in the compression by the piston is altered. In one example, the length of the piston is changed. In another example, the length of the piston rod is changed. In another example, the shape of the upper surface of the piston is changed. In another example, the stiffness of the piston rod is changed. All these changes can be made using a conventional hydraulic piston pump using an existing cylinder barrel. It would also be possible to change the diameter of the piston. This will require a special cylinder barrel.
- a hydraulic piston pump comprising a plurality of pistons arranged in a cylinder barrel, where the cylinder barrel is rotated by an input shaft such that the pistons move back and forth in the cylinder barrel, thereby creating an output pressure and output flow
- the step of; providing a specific output pressure or output flow from at least one piston, and providing a specific output pressure or output flow from at least one piston that differs from the output pressure or output flow from the other pistons is comprised.
- a hydraulic piston pump that emits a sound where the amplitude of the base frequency is lower and where the distribution of frequencies is narrower is obtained, when compared to a regular hydraulic piston pump.
- Fig. 1 shows a schematic vehicle 20 provided with an inventive hydraulic piston pump 1, adapted to power an auxiliary hydraulic component (not shown) of some type.
- the vehicle 20 is in the shown example provided with an electric machine 2 and a transmission 3. In some vehicles, the transmission may not be required.
- the auxiliary hydraulic component may e.g. be a crane, a hoist, a water pump, a lift cylinder, a winch, a compactor or the like.
- the hydraulic piston pump may be mounted to the transmission, as shown in Fig. 1 , or to the electric machine.
- the hydraulic piston pump may be mounted before or after the gearbox of the transmission, depending on the requirements and the intended use of the hydraulic piston pump. It is also possible to provide the hydraulic piston pump with a separate, integrated electric motor such that a freestanding hydraulic piston pump unit is provided.
- Fig. 2 shows a schematic hydraulic piston pump 1.
- the hydraulic piston pump can be used to power any auxiliary hydraulic equipment and can be powered in different ways.
- the hydraulic piston pump is provided with an input shaft 4 suspended on roller bearings and adapted to be connected to a PTO of an electric machine or a transmission, but the hydraulic piston pump may also be provided with an integrated electric motor such that a freestanding hydraulic piston pump unit is provided.
- the hydraulic piston pump 1 comprises a housing 5 that encloses all the components and that is provided with a fastening interface such that the hydraulic piston pump can be attached to e.g. a transmission.
- the input shaft drives a timing gear 6 that intermeshes with the cylinder barrel 10 in a rotary fashion.
- a barrel support 7 supports and guides the cylinder barrel during the rotation of the cylinder barrel.
- the hydraulic piston pump is provided with a number of pistons 8 that are connected to the input shaft 4 through piston shafts 9.
- a piston may be attached to a piston shaft with e.g. a pin or may be integrated with the piston shaft as a single part.
- the rotational axle of the input shaft and the rotational axle of the cylinder barrel are offset with an angle, e.g. between 30 to 45 degrees, such that the pistons will move in and out of a cylinder 13 of the cylinder barrel when the cylinder barrel rotates.
- the hydraulic piston pump is also provided with an end cap 11 that is provided with an input for hydraulic oil and an output for pressurized hydraulic oil.
- one or more pistons are changed, such that the output pressure and/or output flow from that piston differs from the output pressure and/or output flow of the other pistons.
- the number of pistons that are changed can be varied depending on the desired end result. In one example, all pistons are different from each other. In another example, some of the pistons are changed.
- a hydraulic piston pump comprising nine pistons, it is e.g. possible to use two types of pistons, with five pistons of one type and four pistons of another type. It is also possible to use three pistons of a first type, three pistons of a second type and three pistons of a third type.
- the hydraulic piston pump With different types of pistons, the hydraulic piston pump will emit more different ground tones, depending on the number of pistons of the hydraulic piston pump and the difference of the pistons. The spread of the frequency of the emitted sound will be smaller with more different pistons. In a hydraulic piston pump having nine pistons, and where one piston is changed, a ground tone of eight times the rotational speed will be dominant. The single different piston will emit a ground tone with a frequency corresponding to the rotational speed of the hydraulic piston pump. The hydraulic piston pump will further emit overtones with a multiple of eight having a relatively high amplitude, and overtones corresponding to a multiple of the rotational speed having a low amplitude.
- the length of a piston is changed.
- the piston will be shorter than a regular piston, since the original piston length is the maximal length for a piston.
- pistons that are slightly shorter than a regular piston, and by using pistons with different lengths, the tonal character of the emitted sound character can be affected.
- piston rods with different length in order to affect the emitted sound character.
- the piston and piston rod are produced as one piece. In this case, the total length of the combination is changed. By using a shorter piston or piston rod, the output pressure and/or the output flow produced by that piston is reduced slightly. At the same time, the emitted sound character will be affected.
- Another way of altering the output pressure and/or output flow is to change the shape of the upper surface of a piston. This will also introduce a somewhat reduced output pressure and/or output flow from that piston.
- the upper surface may be provided with differently shaped cavities.
- the output pressure and/or output flow is altered by using pistons having different diameters.
- a piston having a diameter that is e.g. larger than the diameter of a regular piston will produce a larger output flow from that piston.
- the emitted sound character from that piston will be affected.
- the stiffness of the piston shaft differs from the stiffness of a regular piston shaft.
- the pressure impulse produced by that piston will change, which will also affect the emitted sound character.
- a less stiff piston rod will flex more, and will thus produce a slightly lower pressure.
- the hydraulic piston pump may be any type of piston pump, such as a bent axis piston pump or a swashplate piston pump.
- Fig. 3 shows a schematic flow chart of the method for modifying emitted sound from a hydraulic piston pump.
- a specific output pressure or output flow is provided from at least one piston.
- the output pressure or output flow is in one example the normal pressure or flow produced by a regular piston.
- a specific output pressure or output flow is provided from at least one piston that differs from the output pressure or output flow from the other pistons.
- the impulses from the different pistons will vary, which may give a more pleasant sound character of the hydraulic pump.
- the hydraulic pump will contain at least two different pistons. More different pistons will give a different tonal character of the emitted sound, and will contain frequency components that become lower and closer in frequency.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22200010.1A EP4350144A1 (de) | 2022-10-06 | 2022-10-06 | Hydraulische kolbenpumpe und verfahren zur beeinflussung des klangverlaufs der kolbenpumpe |
US18/241,467 US20240117798A1 (en) | 2022-10-06 | 2023-09-01 | Hydraulic piston pump and method for affecting the sound character of the piston pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22200010.1A EP4350144A1 (de) | 2022-10-06 | 2022-10-06 | Hydraulische kolbenpumpe und verfahren zur beeinflussung des klangverlaufs der kolbenpumpe |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4350144A1 true EP4350144A1 (de) | 2024-04-10 |
Family
ID=83688776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22200010.1A Pending EP4350144A1 (de) | 2022-10-06 | 2022-10-06 | Hydraulische kolbenpumpe und verfahren zur beeinflussung des klangverlaufs der kolbenpumpe |
Country Status (2)
Country | Link |
---|---|
US (1) | US20240117798A1 (de) |
EP (1) | EP4350144A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090016908A1 (en) * | 2005-08-26 | 2009-01-15 | Michael Hartl | Multi-cylinder, dry-running piston compressor a cooling air flow |
US20160131117A1 (en) * | 2013-06-12 | 2016-05-12 | Technoboost | Hydraulic Machine Comprising Cylinders Provided With Angularly Offset Openings |
US20200256332A1 (en) * | 2019-02-08 | 2020-08-13 | Volvo Car Corporation | Variable pre and de-compression control mechanism and method for hydraulic displacement pump |
-
2022
- 2022-10-06 EP EP22200010.1A patent/EP4350144A1/de active Pending
-
2023
- 2023-09-01 US US18/241,467 patent/US20240117798A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090016908A1 (en) * | 2005-08-26 | 2009-01-15 | Michael Hartl | Multi-cylinder, dry-running piston compressor a cooling air flow |
US20160131117A1 (en) * | 2013-06-12 | 2016-05-12 | Technoboost | Hydraulic Machine Comprising Cylinders Provided With Angularly Offset Openings |
US20200256332A1 (en) * | 2019-02-08 | 2020-08-13 | Volvo Car Corporation | Variable pre and de-compression control mechanism and method for hydraulic displacement pump |
Non-Patent Citations (1)
Title |
---|
SHEN WEI ET AL: "Comparative analysis of component design problems for integrated hydraulic transformers", THE INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, SPRINGER, LONDON, vol. 103, no. 1, 21 March 2019 (2019-03-21), pages 389 - 407, XP036827999, ISSN: 0268-3768, [retrieved on 20190321], DOI: 10.1007/S00170-019-03543-2 * |
Also Published As
Publication number | Publication date |
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US20240117798A1 (en) | 2024-04-11 |
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