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 machine, in particular an axial piston machine, according to the preamble of patent claim 1.
• a hydrostatic piston machine has a rotating cylinder part with a plurality of cylinder chambers, in which a stroke movement piston are arranged in operation.
• each cylinder space is alternately connected via a cylinder space opening with a Niederbuch Strukturo réelle and a Hochbuch Kunststoffo réelle to a control surface of a stationary control part at which there are two Um Kunststofftechnischmaschinee between the Niederbuch compassiono réelle and Hochbuchsteuoffo réelle within which a piston in a dead center reverses its direction of movement Vor statnut extending from a control opening into a Um Tavern Surrey into.
• Such an axial piston machine is disclosed, for example, in DE 197 06 1 16 A1.
• 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 inserted 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
• hydrostatic axial piston machine in swash plate design is adjustable from a positive displacement volume over zero displacement volume to a negative displacement 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 storage 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 Um Kunststoff Kunststoff a control plate.
• the outlet is at a certain mode of operation of the known displacement machine at a small distance from the high pressure control opening of the control plate.
• the storage element is initially charged via the throttle with pressure reduction in the cylinder space and discharges if the cylinder chamber comes into contact with low pressure.
• 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 opening and a Hochbuchberichto réelle on a control surface of a stationary control part at which there are two Um Kunststoffe between the low pressure control and the Hoch Kunststoffsteuoffo réelle within which a piston in a dead center reverses its direction of movement , and having a pilot groove extending from a control port in a
• Previously used in practice hydrostatic piston machines with an internal pressure transfer to control and / or regulating systems require a necessary for stability damping of the system. Occurring high pulsations for the pressure signal processing must be hydraulically or electrically damped. This has a negative impact on the dynamics of the unit.
• 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.
• 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.
• FIG. 2 shows a section of the cylinder drum, control plate and connecting plate of the exemplary embodiment according to FIG. 1, wherein the cylinder drum assumes a specific position relative to a control plate and the axial piston machine is in pump operation,
• Figure 3 shows the same section as in Figure 2 with further rotated cylinder drum
• Figure 4 shows the same section as in Figure 3 with further rotated cylinder drum
• Figure 5 the same section as in Figure 4 with further rotated cylinder drum.
• 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 more 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 takes place.
• Such an axial piston machine is usually referred to as being pivotable or adjustable over zero.
• a cylindrical drum 25 In a cylindrical drum 25 are in 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 unspecified pistons are movably received and at one end of the cylinder drum in elongated , usually curved cylinder space openings 27, which in 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 opening 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.
• 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 Axialkolben- 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 corresponding to the control openings in the control plate
• 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 The starting point for the consideration of the mode of operation is now FIG. 2. There, a web of the cylinder drum 25 separating two control slots 27 is located just above the pilot control groove 34. A control slot 27 is located in front of the pilot control groove 34 in the reversing region 32 there is low pressure.
• the storage volume 45 is connected via the throttle bore 46 and the pilot control groove 34 to 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 control slot 27 of a considered cylinder chamber 26 sweeps over the pilot groove from its end remote from the high pressure control port 29 until its leading edge is above the orifice 47 (see FIG. 3). In this way, the pressure build-up in the cylinder chamber 26 begins. In this case, due to the above-described cross-sectional ratios, the amount of fluid required for the pressure build-up is taken from the storage volume 45.
• the pressure in the storage volume 46 is still significantly lower than the pressure in the high-pressure control opening and in the considered cylinder space 26 due to the given cross-sectional ratios.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47071254

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Citations (4)

Family Cites Families (3)

• 2012
  • 2012-10-17 CN CN201280055240.0A patent/CN103917780B/zh active Active
  • 2012-10-17 IN IN3439DEN2014 patent/IN2014DN03439A/en unknown
  • 2012-10-17 WO PCT/EP2012/070534 patent/WO2013068213A1/de active Application Filing
  • 2012-10-17 DE DE201210218888 patent/DE102012218888A1/de not_active Withdrawn
  • 2012-10-17 EP EP12775661.7A patent/EP2776713B1/de active Active

Patent Citations (4)

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