EP2776713B1 - Hydrostatische kolbenmaschine - Google Patents

Hydrostatische kolbenmaschine Download PDF

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Publication number
EP2776713B1
EP2776713B1 EP12775661.7A EP12775661A EP2776713B1 EP 2776713 B1 EP2776713 B1 EP 2776713B1 EP 12775661 A EP12775661 A EP 12775661A EP 2776713 B1 EP2776713 B1 EP 2776713B1
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EP
European Patent Office
Prior art keywords
cross
section
piston engine
control
mouth
Prior art date
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Active
Application number
EP12775661.7A
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German (de)
English (en)
French (fr)
Other versions
EP2776713A1 (de
Inventor
Andrea HELLSTERN
Rudolf Appel
Peter Roos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2776713A1 publication Critical patent/EP2776713A1/de
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Classifications

    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • 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
    • F04B1/2042—Valves
    • F04B1/205—Cylindrical

Definitions

  • the invention relates to a hydrostatic piston engine, in particular an axial piston engine, according to the preamble of patent claim 1.
  • a hydrostatic piston engine has a rotating cylinder part with a plurality of cylinder chambers, in which pistons carrying a lifting movement are arranged during operation.
  • each cylinder space is alternately connected via a cylinder space opening to a low pressure control port and a high pressure control port on a control surface of a stationary control part at which there are two Um Kunststoffe between the low pressure control port and the high pressure control within which a piston reverses its direction of motion, and the one Vormatinut extending from a control opening into a Um Kunststoff Kunststoff into.
  • Such axial piston machine is for example in the DE 197 06 116 A1 revealed.
  • the known axial piston machine has as a cylinder part arranged on a drive shaft cylinder drum with a plurality of cylinder chambers, in each of which a piston is movably guided.
  • Each cylinder space can be alternately connected to a cylinder-shaped opening introduced on the front side of the cylinder drum with a kidney-shaped low-pressure control opening and high-pressure control opening provided in a control disk serving as a control part.
  • the cylinder drum slides along the face of the control disk.
  • the low-pressure control opening and the high-pressure opening lie on a common pitch circle and are spaced apart in the circumferential direction, whereby two Um Kunststoff Kunststoffe are formed.
  • a respective piston is located in a Um Kunststoff Kunststoff in the region of its inner dead center or bottom Dead Center (BDC), where he is the farthest immersed in his cylinder chamber, and in the other Um Kunststoffe in the area of its outer dead center or Top Dead Center (TDC), in which it protrudes furthest out of his cylinder room.
  • BDC bottom Dead Center
  • TDC Top Dead Center
  • the from the DE 197 06 116 A1 known hydrostatic axial piston machine in swash plate design is adjustable from a positive displacement volume above zero displacement volume to a negative displacement volume and can work in four-quadrant operation, ie in both directions both as a pump and as a motor.
  • the reversal between high pressure and low pressure is to be improved in terms of reducing pressure pulsations by virtue of the fact that the cylinder chambers in the corresponding reversing region are connected to a fluid capacity or to a storage volume.
  • a memory element is provided which is connected via a non-return valve blocking it and a throttle arranged parallel to the check valve with an orifice in the reversal area of a control plate.
  • the orifice is at a certain mode of operation of the known displacement machine at a short distance from the high pressure control port of the control plate.
  • a cylinder chamber opening is opened to the orifice as soon as their connection to the low pressure control opening is closed.
  • pressurized fluid flows via the check valve from the storage element into the cylinder chamber.
  • the connection of the cylinder chamber is made with the high pressure control port and then brought the storage element via the throttle back to high pressure.
  • the reversal is further influenced by the fact that from the high-pressure control opening from a pilot groove extends into the Um Kunststoff Kunststoff inside.
  • a cavity which is filled or to be filled with a liquid pressure medium, for example hydraulic oil, and in which a pressure change is due solely to the compressibility of the pressure medium connected to an inflow or outflow of pressure medium.
  • a liquid pressure medium for example hydraulic oil
  • the invention has for its object to provide a hydrostatic piston engine in which a Umêtkapaztician is easily throttled constantly connected to the associated pressure port.
  • a hydrostatic piston engine in particular an axial piston engine, has a rotating cylinder part with a plurality of cylinder chambers, in which pistons carrying a lifting movement are arranged during operation.
  • Each cylinder chamber is in operation via a cylinder chamber opening alternately connectable to a low pressure control port and a high pressure control port on a control surface of a stationary control part, in which there are two Um Kunststoff Kunststoffe between the low pressure control port and the high pressure control within which a piston at a dead center reverses its direction, and the one Vor Kunststoffnut extending from a control opening into a Um Kunststoff Kunststoff into.
  • an opening is provided in a reversing area, which at least approximately approaches the cylinder space openings paint over their entire length. It is provided a fluid capacity of defined size, with which the outlet is connected via a particular throttled fluid connection. The outlet is located in the pilot groove.
  • the pilot control groove in which the orifice is located, advantageously has a cross section, which in particular increases continuously in the direction of the control opening.
  • the cross-sectional ratios are obtained simply by positioning the outlet of the fluid connection in the pilot groove so that the pilot groove extends from the orifice over a greater distance, preferably over about two-thirds of its total length toward the control port and over a smaller distance to its Leaping out.
  • the type of reversal is chosen in particular for a reversal of low pressure to high pressure in pump operation or engine operation. Accordingly, the pilot control groove, in which the mouth of the fluid connection is positioned to the fluid capacity, exits from the high pressure control port. However, the type of reversal is also applicable to the reversal of high pressure to low pressure.
  • the throttling effect of the fluid communication between the orifice and the fluid capacity is advantageously independent of the direction of flow of the fluid.
  • parts of a hydrostatic axial piston machine are shown in swash plate design, which is to be operated while maintaining the direction of rotation and without change of high pressure and low pressure side both as a pump and as a motor.
  • the swash plate not shown in detail can therefore be pivoted in opposite directions in a known manner with respect to a zero position in which at least theoretically no pressure medium flow through the machine.
  • Such an axial piston machine is usually referred to as being pivotable or adjustable over zero.
  • a cylinder drum 25 In a cylinder drum 25 are in each case the same distance from a drum axis and at equal angular intervals from each other several, for example, nine cylinder chambers 26 in the form of cylinder bores in which non-illustrated pistons are movably received and at one end of the cylinder drum in elongated, usually curved cylinder space openings 27, which in the Following control slots are called, open.
  • the width of the control slots 27 is smaller than the diameter of a cylinder bore.
  • the cylinder drum 25 rests with the end face with the control slots 27 on a serving as a control part control plate 28 and slides in operation over this time.
  • the control plate has two kidney-shaped control openings 29 and 30, which are located on the same pitch circle as the control slots 27 and of which present the control port 29 as a high pressure control port in which a high pressure (for example a pressure of 200 bar) is present in operation, and the Control port 30 serves as a low-pressure control opening in which a low pressure (for example, a pressure of less than 5 bar), in particular tank pressure, is present during operation.
  • control slots 27 change from an open fluidic connection to the high-pressure control opening 29 to an open fluidic connection to the low-pressure control opening 30, and a reversing area 32, in that the control slots 27 change from an open fluidic connection to the low-pressure control opening 30 to an open fluidic connection to the high-pressure control opening 29.
  • pilot grooves mounted, of which in the figures, a pilot control groove 34 is shown at the high pressure control port.
  • the pilot groove 34 is designed so that its cross section from the high pressure control port 29 decreases continuously. It is a triangular notch whose depth and width are linearly reduced from a control port.
  • the control plate 28 is against rotation on a connection plate 40 of the axial piston machine, wherein in the connection plate, a high-pressure channel 41 and a low-pressure channel 42 are formed, which lead from an outer side of the connection plate to the control plate facing end side of the connection plate and at this end face a the control openings in the control plate have corresponding cross-sectional shape and at least largely coincide with the control openings.
  • connection plate 40 which forms a fluid capacity or a storage volume and of which a through the connection plate 40th and the control plate 28 passing through bore 46 with an opening 47 in the Um Grill Scheme 31.
  • the orifice 47 is located in the pilot control groove 34, which, as already mentioned, is a triangular groove with a continuously decreasing cross section away from the control opening 29.
  • the position of the orifice in the pilot groove 34 is selected so that the cross section of the pilot groove in the region of the orifice is smaller than the cross section of the throttle bore 46.
  • FIG. 2 There is a two control slots 27 separated from each other web of the cylinder drum 25 just above the pilot groove 34.
  • a control slot 27 is located in front of the pilot groove 34 in the Um Kunststoff Anlagen 32.
  • the storage volume 45 is connected via the throttle bore 46 and the pilot control groove 34 with the high pressure control port 29 and further to the high pressure passage 41. Therefore, the same pressure prevails in the storage volume 45 as in the high-pressure control opening 29.
  • the leading edge of the control slot 27 continues to sweep the pilot groove 34 to a position where it reaches the high pressure pilot port 29 (see FIG FIG. 4 ).
  • the further pressure buildup proceeds as in a standard reversing, which has only the pilot control groove 34.
  • the control slot 27 of the cylinder chamber 26 passes over the high pressure control port 29 (see FIG. 5 ). Due to the above-described cross-sectional ratios of throttle bore 46 and pilot control groove 34, the pressure equalization between the high pressure control port 29 and the storage volume 45 begins substantially only after the pressure equalization between the high pressure control port 29 and the cylinder chamber 26 is reached. The result is a total of over a longer period lasting and thus uniformed fluid removal from the high-pressure control port 29 and the related parts of the hydraulic circuit for the pressure build-up in the cylinder chamber 26 and thus a significant reduction in pressure pulsations in the high pressure area.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP12775661.7A 2011-11-12 2012-10-17 Hydrostatische kolbenmaschine Active EP2776713B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011118402 2011-11-12
PCT/EP2012/070534 WO2013068213A1 (de) 2011-11-12 2012-10-17 Hydrostatische kolbenmaschine

Publications (2)

Publication Number Publication Date
EP2776713A1 EP2776713A1 (de) 2014-09-17
EP2776713B1 true EP2776713B1 (de) 2015-12-30

Family

ID=47071254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12775661.7A Active EP2776713B1 (de) 2011-11-12 2012-10-17 Hydrostatische kolbenmaschine

Country Status (5)

Country Link
EP (1) EP2776713B1 (enrdf_load_stackoverflow)
CN (1) CN103917780B (enrdf_load_stackoverflow)
DE (1) DE102012218888A1 (enrdf_load_stackoverflow)
IN (1) IN2014DN03439A (enrdf_load_stackoverflow)
WO (1) WO2013068213A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014208406A1 (de) * 2014-05-06 2015-11-12 Robert Bosch Gmbh Hydrostatische Kolbenmaschine
WO2025147305A1 (en) * 2024-01-01 2025-07-10 Parker-Hannifin Corporation Hydraulic pump with an attenuator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3725361A1 (de) * 1987-07-30 1989-02-16 Brueninghaus Hydraulik Gmbh Axialkolbenmaschine in schraegscheiben- oder schraegachsenbauart mit schlitzsteuerung und druckausgleichskanaelen
JPH08144941A (ja) * 1994-11-21 1996-06-04 Uchida Yuatsu Kiki Kogyo Kk 斜板形アキシャルピストンポンプ用脈動低減装置
JP3362576B2 (ja) * 1995-02-10 2003-01-07 ダイキン工業株式会社 可変容量形ピストン機械
DE19706116C5 (de) 1997-02-17 2012-12-20 Linde Material Handling Gmbh Vorrichtung zur Pulsationsminderung an hydrostatischen Verdrängereinheiten
JP2000345955A (ja) * 1999-05-31 2000-12-12 Toshiba Mach Co Ltd ピストンポンプ・モータ
DE10206957B4 (de) * 2002-02-19 2014-09-04 Linde Hydraulics Gmbh & Co. Kg Hydrostatische Verdrängereinheit mit einer Vorrichtung umfassend ein Speicherelement zur Verminderung von Pulsationen
DE112006000312T5 (de) * 2005-02-10 2007-12-13 Komatsu Ltd. Hydraulische Kolbenpumpe

Also Published As

Publication number Publication date
DE102012218888A1 (de) 2013-05-16
WO2013068213A1 (de) 2013-05-16
EP2776713A1 (de) 2014-09-17
CN103917780A (zh) 2014-07-09
CN103917780B (zh) 2016-12-14
IN2014DN03439A (enrdf_load_stackoverflow) 2015-06-05

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