EP1511940A1 - Steuereinrichtung - Google Patents
SteuereinrichtungInfo
- Publication number
- EP1511940A1 EP1511940A1 EP03810425A EP03810425A EP1511940A1 EP 1511940 A1 EP1511940 A1 EP 1511940A1 EP 03810425 A EP03810425 A EP 03810425A EP 03810425 A EP03810425 A EP 03810425A EP 1511940 A1 EP1511940 A1 EP 1511940A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- face
- valve piston
- control device
- valve
- fluid
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
Definitions
- a hydraulic control device for controlling two pressure spaces A and B of a hydraulic motor works in the form of a working cylinder according to the principle of a hydraulic bridge circuit.
- a fluid pump P conveys fluid via throttling points Q1, D2, D3 and D4 to a tank T.
- the throttling points form passages for the fluid, the flow cross sections of which are variable.
- the throttling points D1, D2, D3 and D4 work together in pairs, namely D1 with D3 and D2 with D4. If, for example, the flow cross-section of D1 and D3 is reduced, the flow resistance of the fluid increases, which is noticeable by an increased fluid pressure with a constant fluid flow conveyed by the fluid pump P. This situation is shown in FIG. 2.
- the increased fluid pressure is shown by the increased line width of the lines.
- the increased fluid pressure is communicated to the pressure chamber B of the working cylinder via a connecting line 1.
- a pressure force F1 is generated on a piston K of a working cylinder, which moves the piston K to the left.
- a part designated as a slide with a circular cross section is moved back and forth axially or tangentially from a defined neutral position in a part designated as a sleeve with a circular inner tube cross section.
- recesses can be created as a result of the slide movement as throttling points D1, D2, D3 and D4 of a hydraulic bridge circuit.
- Such a control device can be composed of four modules M1, M2, M3 and M4, each of which takes on the function of the throttle points D1, D2, D3 and D4 of a hydraulic bridge circuit.
- the four modules can be constructed identically.
- One of these modules is shown in principle in Figure 4. It has a housing bore in a housing 4, in which a valve piston 5 is arranged to be axially displaceable.
- a piston seal S divides the housing bore into sections in which different pressures can prevail.
- a small fluid flow flows through a bore 9 into a space 10 and through a bore 11 into a space 12 and from there via an opening 13 back into the tank T (FIG. 1).
- a throttle needle 14 is moved downward into the bore 11 by a force, the flow resistance of the opening existing between the mouth of the bore 11 and the throttle needle 14 increases, as a result of which the fluid pressure in the bore 11 and in the space 10 increases.
- the pressure force acting on the upper end face of the valve piston 5 moves the valve piston downwards until an equilibrium has been established with the pressure force acting on the lower end face. In this way, the fluid pressure in the inlet 2 can be controlled via the immersion depth of the throttle needle 14 in the bore 11, this fluid pressure being proportional to the force to be applied to the throttle needle 14.
- Control devices in which each of the throttling points D1, D2, D3 and D4 of a hydraulic bridge circuit are replaced by one of the identical modules M1, M2, M3 and M4 correspond to the prior art.
- a control device with a modular structure is e.g. from the
- Control device known that has two identical modules. These are referred to there as “partial valves” or “cartridges 4 and 5" (see description there, column 1, lines 50 ff. And FIG. 3).
- Each of the Cartridge comprises two throttles 1 and 2a or 1a and 2, which are part of a hydraulic bridge circuit ( Figures 1 and 2).
- the design has the advantage that both cartridges with an open center and cartridges with a closed center can be used (see column 2, lines 65 ff.).
- the throttle points controlled in the same direction, such as throttles 1 and -1a are, however, spatially separated from one another in each of the sub-valves (cartridges 4 and 5 in FIG. 3).
- the design therefore requires the most precise possible symmetrical valve control on both sides so that the bridge circuit can work optimally.
- the object of the invention is to simplify the design of a control device with throttle points.
- the invention simplifies the construction of a control device which has at least two throttle points which can be controlled in the same direction by combining the functionally working throttle points, that is to say D1 with D3 and / or D2 with D4, to form a spatial and functional unit.
- the functionally working throttle points that is to say D1 with D3 and / or D2 with D4, to form a spatial and functional unit.
- FIG. 6 shows a basic sectional view of a control device according to the invention in a first switching situation
- FIG. 7 a second switching situation
- FIG. 8 a modified control device
- FIG. 6 A control device of the design according to the invention is shown in FIG. 6.
- the modules M1 and M3 of the previous figures are combined to form the module M5 and the modules M2 and M4 are combined to form the module M6.
- the throttle points D1, D2, D3 and D4 of a hydraulic bridge circuit shown in FIG. 6 result as a circular disc ring gap of small and variable height between a housing 15 and controlling end faces S1 and S2 of valve pistons 16 and 17.
- the constant hydraulic separation between the throttle points D1 and D3 or D4 and D2 are each caused by an elastic sealing element 18 and 19, respectively, concentrically embedded between the two disk ring gaps of a controlling end face.
- Lines shown as lines in FIG. 6 (for example: L) can in reality be designed as housing bores.
- recesses in the form of two annular grooves 20 and 21 or 22 and 23 are concentric in the end faces B1, B2 of the housing bores or (in another embodiment not shown here ) embedded in the controlling end faces of the valve pistons 16 and 17.
- FIG. 6 Another switching situation of the control device according to FIG. 6 is shown in FIG. Enlarged line widths indicate areas of the lines with increased fluid pressure.
- a throttle needle 24 is moved by a force into the mouth of a throttle bore 25.
- the small fluid flow flowing through a bore 26 to the throttle bore 25 is brought to a higher fluid pressure by the reduced flow cross-section between the throttle needle 24 and the mouth of the throttle bore 25.
- the system pressure With increasing immersion depth of the throttle needle 24 into the mouth of the throttle bore 25, the system pressure ultimately increases, that is to say the fluid pressure in a space 30. This pressure is transferred to the pressure chamber A via the restriction D1.
- a left throttle needle 24a is pushed into the mouth of a throttle bore 25a in FIG. 6, the small fluid flow flowing through a bore 28 to the throttle bore 25a is brought to a higher fluid pressure by reducing the flow cross-section between throttle needle 24a and the mouth of the throttle bore 25a.
- the system pressure ie the fluid pressure in an annular space 40 and in space 30, increases. This pressure is transferred to the pressure chamber B via the throttle point D2 and the annular groove 22.
- the bores 26, 28 serve the so-called pilot control, which is known per se.
- the two valve pistons 16 and 17 with their controlling end faces S1, S2 can also be pressed against the end faces of the housing bores facing them without the effect of the valve pilot control described above. The actuation force required for this can then be applied mechanically, electrically or pneumatically.
- valve piston 16 If the valve piston 16 is activated in the other actuation case, the same happens with the valve piston 17, which is then not activated, and is pressed to the right against its end-face contact surface 39 by the system pressure in such a way that the mouth of the bore 26 is closed with the effect described above.
- the spaces 36 and 38 are connected to the fluid pump P between the rear (that is to say non-controlling) end faces of the valve pistons 16a and 17a and the contact surfaces 27 and 39 via connecting lines 32 and 33.
- the valve pistons 16a and 17a are each designed with an annular collar (ring rib) 35 and 34, which in the exemplary case of the valve piston 16a being in contact with the contact surface 27 results in a clear hydraulic separation between the spaces 36 and 37 and thus in the in FIG Figure 8 illustrated switching situation closes the fluid inlet from space 36 via space 37 to the throttle bore 31. As in the version of the pilot control described above, this avoids an unnecessary leakage of fluid.
- Control device which can be used in a hydraulic bridge circuit, the four throttling points of which are designed as four seat valve modules and the two modules which cooperate in the bridge circuit and are diagonally opposite one another are spatially combined.
- a controlling end face S ⁇ , S2 of two drum-shaped and axially movable in two housing bores Valve piston 16, 17 two concentric annular grooves 20, 21 and 22, 23 embedded with a sealing element 18, 19 arranged concentrically therebetween, whereby two annular throttle gaps of small and variable height are located between this end face S1 or S2 on the valve piston side and the end face facing the housing bore result that act as the aforementioned spatially combined modules.
- valve pistons can be moved using a so-called valve pilot control principle or by applying external forces.
- the two concentric ring grooves can also each be embedded in the end face on the housing bore side.
- valve piston moves according to the pilot control principle
- the fluid is supplied to the pilot control through a bore 28 or 26 in the valve piston 16 or 17 or via a separate line .
- 32 and 33 are supplied, the orifices of which are arranged on the rear end face of the valve pistons in such a way that they are closed by abutment of the valve pistons on an abutment surface 27 which limits the movement, in order to avoid unnecessary leakage fluid flows when the valve piston which is not currently activated by increased Fluid pressure is pressed against this contact surface.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10251127 | 2002-11-02 | ||
| DE2002151127 DE10251127B4 (de) | 2002-11-02 | 2002-11-02 | Steuereinrichtung |
| PCT/EP2003/012144 WO2004042234A1 (de) | 2002-11-02 | 2003-10-31 | Steuereinrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1511940A1 true EP1511940A1 (de) | 2005-03-09 |
| EP1511940B1 EP1511940B1 (de) | 2006-05-24 |
Family
ID=32115150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03810425A Expired - Lifetime EP1511940B1 (de) | 2002-11-02 | 2003-10-31 | Steuereinrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1511940B1 (de) |
| DE (1) | DE10251127B4 (de) |
| WO (1) | WO2004042234A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9328747B2 (en) * | 2013-03-15 | 2016-05-03 | Mts Systems Corporation | Servo actuator load vector generating system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4224606A1 (de) * | 1992-07-25 | 1994-01-27 | Joerg J Prof Dipl Ing Linser | Servoventil |
| DE4238331A1 (de) * | 1992-11-13 | 1994-05-19 | Linser Joerg Prof Dipl Ing Fh | Servoventil |
| DE19601662A1 (de) * | 1996-01-18 | 1997-07-24 | Joerg J Prof Dipl Ing Linser | Servoventil in Kartuschenausführung, vorzugsweise für Hilfskraftlenkungen |
| DE10006141A1 (de) * | 2000-02-11 | 2001-09-06 | Zf Lenksysteme Gmbh | Elektrohydraulische Steuervorrichtung |
-
2002
- 2002-11-02 DE DE2002151127 patent/DE10251127B4/de not_active Expired - Fee Related
-
2003
- 2003-10-31 WO PCT/EP2003/012144 patent/WO2004042234A1/de not_active Ceased
- 2003-10-31 EP EP03810425A patent/EP1511940B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004042234A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10251127B4 (de) | 2008-11-06 |
| EP1511940B1 (de) | 2006-05-24 |
| DE10251127A1 (de) | 2004-05-19 |
| WO2004042234A1 (de) | 2004-05-21 |
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