DE2101457A1 - Electrically driven adjustment device with hydraulic power amplification - Google Patents

Description

2101-57

8ROVVi-. ÜOVER! & CiE · CORPORATE SOCIETY ^:. '. .., '-. ·>

Mp.no. 672/70 Mannheim, December 30, 1970

PAT-Fz / Bt.

Electrically driven adjustment device with hydraulic i

'■■ Power amplification:

! ■ I

: The present invention relates to an electrically connected

'

driven adjustment device with hydraulic Kraftver =

ι. "ι

j Strengthening for Brempsn, drainage valves and the like

ι with a unidirectional pump for the hvdrau =, Lische hydraulic fluid and one guided in a cylinder

working piston acted upon by the hydraulic fluid. i

They are electrically driven actuators!

known with hydraulic power amplification (DPS 633 211),;

with a pump driven by an electric motor, which j

through pipelines with a working cylinder and a wind =;

boiler is connected. The piston rod of the j

in the cylinder situated working piston the pliers legs \

a pair of stripper pliers. I.

Is it now, for example, about adjustment devices'

for drain valves that are seldom operated,;

this is how the well-known conventional adjusters turn out to be

directions in which the hydraulic pump moves from one direction =!

running electric motor is driven as too expensive. i

Eliminating this disadvantage is one of the quills of the inventor =!

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, 'dung. On the other hand, devices with a high switching frequency often have = j Speed pumps with a normal electric motor drive are in turn unfavorable because of the = j because such drives are relatively very j must be made large and it is disadvantageous that; the mass of the rotating parts is accelerated again and again must become. j

Electro-hydraulic amplifiers are also known (DAS
1 061 625), which is used, for example, to operate a Druckge =
controlled servo valve can be used and with
a hydraulic control that consists of a
Hydraulic cylinder and one mounted so that it can move back and forth
There is a piston to which a piston rod is connected
is. These electro-hydraulic relay arrangements are
two outflow nozzles provided for a fluid, whose
! Outlet openings through the optional relocation of cover =
parts can be changed differently, the cover parts using electromagnets by applying a reversible! electrical signal can be moved in order to change the openings in the opposite direction in one sense or the other. Such electrohydraulic amplifiers in which discharge nozzles
for a fluid with an electrical signal
Detected anchors are controlled are very prone to failure,
la dirt particles in the hydraulic fluid the nozzle opening =
lungs easily clogged. To avoid it, or at least
Reduction of this risk are then very costly and
Complicated measures required.

s are also reversible drives for pressure medium actuated
adjusting elements, in particular for Reael valves, throttle valves
or the like known (DAS 1 239 947) with a with the
Detected device connected drive housing, a
Connect the drive means with the actuated device =
Pole and one between two carried by the pole
^ return springs clamped in spring plates. These pneumatically

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operated facilities require relatively very large j

Areas on which the control air pressure comes into effect. j The space requirement is accordingly large. At these institutions

the control air pressure is fed to a diaphragm housing; |

the membrane is connected to the closing body of the | via a rod

connected to actuated valve. There are special j compressed air generation systems required; the air requirement is considerable. The necessary additional devices are therefore expensive and make these known pressure medium drives more expensive.

The invention is based on the object of an adjustment =

to create a facility of the type in question, which I

characterized by a simple structure, less complex and little j

is susceptible to failure and the j Avoids disadvantages inherent in facilities.

To solve the above-mentioned problem, in the case of an electrically driven adjusting device with hydraulic force = Reinforcement for brakes, drainage valves and the like, with a unidirectional pump for the hydrau = Lische pressure fluid and a guided in a cylinder by the pressure fluid acted upon working piston according to of the invention as an electromagnetically operated pump, preferably oscillating at the frequency of the alternating current Piston pump (oscillating armature pump) provided.

Although, in principle, in the case of the adjustment device according to the invention, pumping systems with oscillation also operate without valves armature drive could be used, the adjustment = device is in the interest of greater efficiency preferably equipped with a swing arm working with two valves, with one in a flow tube free-swinging, made of magnetizable material Piston through which the hydraulic pressure fluid flows and a magnetic coil surrounding the flow tube.

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In the device according to the invention, the first valve is (Suction valve) attached to the pressure-side end of the piston, the second (pressure valve) is downstream of the first arranged in the flow tube. A bypass line is also provided for the hydraulic fluid, of which the first the space downstream of the pressure valve with the space upstream of this (pump space) connects, wherein the second bypass line a connection j between the pump chamber and the space in front of the suction side of the Piston manufactures. The two bypass lines open into the pump chamber at one located directly in front of the piston Place when this is in its end position furthest away from the pressure valve.

The adjusting device can also be equipped with a vibrating armature working with two valves, which is designed so that according to a development of the invention to the pump chamber of the pump cylinder in which the I. The axial piston swings back and forth, outside of the stroke range! of the piston, a suction line containing a suction valve!

ί and a pressure valve-containing pressure line are connected 'and that two bypass lines are provided for the pressure fluid I, one of which is the Saucrleitung upstream downstream of the suction valve and the other pressure ^line: linking the pressure valve to the pump chamber, wherein the j two bypass lines in the pump chamber open at a point located directly in front of the piston when the latter is in its end position, which it assumes before the start of the pressure stroke j.

In the two aforementioned cases, the invention provides that the piston extends in an axial direction Has section on which he is tight in the flow tube

mm K -m

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or is guided in the pump cylinder and that this, preferably = section beginning at the pressure-side end of the piston, has a length which is greater than the maximum piston stroke.

According to a further development of the invention, the working piston can have the same fastening = on its two sides provided means for the piston rod and the working cylinder be designed so that compression springs with relatively high preload can be optionally mounted in one or the other of the cylinder spaces separated by the piston, wherein the compression springs exert a force acting in the axial direction on the working piston.

The adjusting device according to the invention is expediently designed so that the working cylinder and the pump form a structural unit. According to a preferred embodiment of the invention, the pump is on the working = cylinder can be mounted in such a way that it optionally feeds into one or the other of the cylinder spaces separated by the piston, or from the other or one of these cylinder spaces directly or optionally via a liquid container sucks.

Finally, in certain cases it can be expedient to design the adjusting device in such a way that, according to a next = Formation of the invention a second electromagnetically operated pump is provided and the arrangement of the liquid = lines is made so that the space in front of one side of the working piston with the pressure side of the first pump, which The suction side of the first pump with the suction side of the second pump and the pressure side of the second pump with the space are connected in front of the other side of the working piston (in series).

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Further 'Merlanale and details of the invention are in
described below with reference to exemplary embodiments.
The drawings show:

Fig. 1 and 2 are schematic arrangements of the invention

Adjusting device with a pump,
Fig. 3 and 4 arrangements of the adjusting device with two

Pump,
Fig. 5a to 5d different connection options for the pump

or the pumps to the working cylinder,
Fig. 6 is a circuit diagram for one in the Verstellein =

direction of intended pump,
7 shows a section through a modified embodiment

a vibrating armature pump for the invention

Adjusting device.

In Fig. 1, 1 means the working piston, which is in the working =
cylinder 2 is guided. The piston rod 3 is at its lower

End in a manner known per se with an indicated at 4 = j

ended valve, for example a drain valve ver = ι

bound. The arrow 5 indicates the direction in which the j

Valve is opened. The closing movement of valve 4 is ^!

caused by compression springs 6 relatively high bias, ]

which in the opposite of the pressure side of the working piston 1 = i

arranged space (suction side) of the work cylinder 2:

are. 7 with a one-way pump i for the hydraulic pressure fluid is referred to, the fiction =

according to as an electromagnetically operated, preferably >

Piston pump oscillating with the frequency of the alternating current;

(Oscillating armature pump) is formed. The room in front of one j The side of piston 1 is the pressure side (via line

8) and the space in front of the other side of the piston with the suction side:

ι (via line 9) of the pump 7 connected. At the request of the!

Point 7, the working piston 1 is moved in the direction of arrow 5,
the valve 4 is thus opened.

2 "O983270 2 39 ~ _RAD original

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Like the Fiq. 1 further shows that the piston 1 is on one side blind bores 10 for receiving and guiding the compression springs 6. According to another feature of the Er = Finding is the working piston 1 on both sides with the same fastening means for the piston = rod 3 provided, which can be threaded holes 48, for example, and the working cylinder 2 is designed so that the compression springs 6 can be optionally mounted in one or the other of the cylinder spaces separated by the piston 1 are. Thanks to the measures described above, the adjustment device according to the invention can also be designed in this way without further ado be that the pump 7 can be mounted so that it can be selectively in one or the other of the separated by the piston 1 Promotes cylinder chambers or from the other or one of these cylinder chambers directly or optionally via one Sucks in liquid container, as a comparison of FIG. 1 with FIG. 2 makes clear. In these two figures, As in the figures to be described later, the same parts are always provided with the same reference numerals. To get from the arrangement of Fig. 1 to that of Fig. 2;

it is only necessary to install the working piston 1 in reverse and the compression springs 6 instead of in the upper in the lower cylinder part to assemble.

In a modified embodiment of the invention, ver = on the above-mentioned compression springs in the working cylinder pulled when a second electromagnetically operated pump is provided. The embodiment according to Fig. 3 shows this case. The arrangement of the hydraulic fluid = lines is made so that the space in front of the one

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Side of the working piston la with the pressure side of the first

Pump 7a, the suction side of the first pump with the suction side j

the second pump 7b and the pressure side of the second pump j

with the space in front of the other side of the workbench (in j

Series connection) are connected. In this case they work!

Pumps 7a _r 7b in opposite directions. By alternately pressing the t

The working piston la can pump back and forth accordingly

moved or brought into certain positions. -!

Thus, the device according to the invention is a true rule = j

drive usable, with high adjustment speeds and j

the possibility of up to 6000 switching commands per minute = ]

to take. As is well known, such pumps allow even in duration =,

operated high stroke rates without excessive heating. !

Additional measures to control the inertia]

are not required here compared to motorized drives. '■ Fig. 4 shows an embodiment of an adjusting device =

management of the type last described, in which in the line = ■ guide between the suction sides of the two pumps 7a, 7b

Liquid container 11 is turned on. i

In the case of the adjusting device according to the invention, this must be ensured
be that when the pump is switched off, the hydraulic fluid ent =
can flow back through the pump against the conveying direction.
For example, in the case of FIG. 1, if the valve
4 by moving the working piston 1 against the arrow =
direction 5 can be closed by the force of the compression springs 6
should, the hydraulic fluid from the lower cylinder chamber of the
Working cylinders 2 via the lines 8, 9 against the conveyor =
direction of the pump, ie against the direction of the
Arrow 12 can flow back into the upper cylinder space.
For this purpose, as FIG. 6 shows schematically,
the arrangement of the Schwing = working with two valves
anchor pump are made in such a way that the pump chamber 13
of the pump cylinder 14, in which the pump piston 15 out

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and outside the stroke range of the piston, the suction line 17 containing a suction valve 16 and the one swings Pressure line 19 containing pressure valve 18 are connected,

j and that two bypass lines are provided for the pressure fluid, of which one 20 connects the suction line upstream of the suction valve and the other 21 connects the pressure line downstream of the pressure valve with the pump chamber 13, the two bypass lines 20, 21 in the pump chamber at one open immediately in front of the piston 15 located point when it is in its end position, which r it assumes before the start of the pressure stroke. As FIG. 6 further shows, the pump piston 15 has a section extending in the axial direction of length 1, on which it is guided tightly in the pump cylinder 14. The length 1 is greater than the maximum piston stroke, ie 1 h + s, where h is the piston stroke and s is the distance to go. The measure s should

j be large enough to ensure that the bypass lines are safely covered 20, 21 is reached. The magnet for driving the oscillating armature pump is indicated at 22 in the basic circuit diagram. With a spring 23 is referred to, which ensures that the pump piston 15, which at each half-wave of the electrical Current is attracted, returns to the starting position between the half waves.

Another Ausführungsforra that in the invention Adjusting device to be provided is shown in Fig. 7 = is shown. This is a version with a ! oscillating armature pump working with two valves with one, freely oscillating in a flow tube 24, magnetized from Existing material piston 25 through which the hydraulic pressure fluid flows and one of the flow tube

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unigebenden solenoid, not shown in the drawing. The direction of delivery for the hydraulic fluid is through the Arrow 26 indicated. According to the invention, a suction valve 27 is attached to the pressure-side end of the pump piston 25, while a pressure valve 28 is arranged in the flow tube 24 downstream of the suction valve. There is also a bypass = Line provided for the pressure fluid, of which the first 29 the downstream of the pressure valve 28 space 33 connects to the space (pump space) 30 located upstream of this. The second bypass line 31 provides a Connection between the pump chamber and the chamber 32 in front of the suction side of the piston 25. The two bypass lines 29, 31 open into the pump chamber 30 at a point located immediately in front of the piston 25 when the latter is in its end furthest from the pressure valve 28 = is located, which is shown in FIG. Hit 34 is a stop in the flow tube 24 is referred to, except for which the pump piston 25 when the electrical current is switched off can be pushed back by the spring 35. Here, too, the pump piston 25 extends in the axial direction extending section 1, on which it is tightly guided in the flow pipe 24, this section having a length which must be greater than the maximum piston stroke.

The adjusting device according to the invention is preferably designed so that the working cylinder and the pump have a j

form a structural unit. In doing so, the situation and mutual! Removal of the inlet and outlet openings for the I. Hydraulic fluid on the working cylinder and on the pump (s)! as well as their dimensions are chosen so that on the same Working cylinder optionally a pump can be mounted, which in one position in one of the working =

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piston separate cylinder chambers and in the 180 offset position in the other of the two cylinder spaces promotes. This possibility is shown in FIGS. 5a and 5b, schema = indicated at the table. There it means 36 the working cylinder,

37 the area provided on the working cylinder to which the Pump 38 is attached by means known per se. With 39, 40 are the inlet and outlet openings for the Pressure fluid on the working cylinder 36 is referred to. The pump

38 can now be mounted in such a way that it passes through opening 39 in FIG conveys one of the cylinder spaces separated by the working piston and thereby sucks in via the opening 40. In In the position offset by 180 °, the pump then delivers in accordance with the arrow direction 42 shown in dashed lines via the opening 40 into the other cylinder space of the working = Cylinder 36, whereby it sucks in via the opening 39. In the latter case, of course, the one not shown here must Working piston in the working cylinder 36 are mounted in reverse and the compression springs must be arranged in the other cylinder space are, as is also clearly evident from FIGS. 1 and 2.

However, two pumps 43, 44 can also be arranged on the same working cylinder 36, as shown in FIG. 5c, 5d show schematically. These pumps can be exactly the same in terms of their dimensions and other training as im Case of Fig. 5a, 5b provided pump 38 correspond. The arrangement is made so that, like this in particular Fig. 5c shows that one of the two pumps, namely pump 43 with its outlet opening on the pressure side to the Opening 39 is connected to the working cylinder 36, while the other, namely the pump 44 with its pressure-side The outlet opening is connected to the opening 40 of the working cylinder 36, so that there is an arrangement such as it is shown schematically in FIG. In these

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Case, as already said, the compression springs in the working = cylinders are no longer available. The pumps 43, 44 with their inlet openings 45, 46 on the suction side are not connected to one Connection channel shown connected, which can be arranged in the hatched part 47 (see Fig. 5d). If necessary, this connecting channel can be provided with a corresponding extension so that it can thus forms a common hydraulic fluid container "for the pumps.

The invention is not limited to the above-described j

i or illustrated embodiments are limited. There are !

various deviations, especially structural ■ Kind of conceivable. For example, I

ι the compression springs in the working cylinder instead of the one shown in Fig.

1 and 2 illustrated blind bores 10 can also be provided on the working piston mandrel for this purpose. The number of Compression springs 6 can be chosen arbitrarily and their arrangement can be made, for example, so that the springs are equal are moderately distributed over the entire area of the working piston 1.

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Claims (15)

- 13 - 672/70 patent claims 1. Electrically driven adjusting device rait hydraulic power amplification for brakes, drainage valves and the like with a promote in one direction = the pump for the hydraulic fluid and a cylinder guided by the hydraulic fluid acted upon working piston, characterized in that as a pump a Electromagnetically operated piston pump (oscillating armature pump) oscillating with the frequency of the alternating current is provided. 2. Adjusting device according to claim 1 with one with two Valves working oscillating armature pump with a freely oscillating in a flow tube, made of magnetizing = Existing piston, through which the hydraulic pressure fluid flows and one the The solenoid coil surrounding the flow tube, characterized in that the first valve (suction valve 27) is at pressure = side end of the piston attached, the second (pressure = valve 28) downstream of the first in the flow = tube (24) is arranged and that a bypass line is provided for the hydraulic fluid, of which the first (29) the space (33) located downstream of the pressure valve (28) with the space (33) located upstream thereof Room (pump room 30) connects and the second (31) a connection between the pump room and the room (32) in front of the suction side of the piston (25), the two bypass lines (29, 31) into the pump chamber (30) open at a point located immediately in front of the piston when this is in its of the pressure = valve (28) is at the furthest end position. (Fig. 7) - 14 - 209832/0239 - 14 - 672/70 3. Adjusting device according to claim 1 with a vibrating armature pump working with two valves, characterized = shows that the pump chamber (13) of the pump cylinder (14), in which the pump piston (15) swings back and forth, outside the stroke range of the piston, the suction line (17) containing a suction valve (16) and the one Pressure line (19) containing pressure valve (18) are connected and that two bypass lines for pressure = liquid are provided, of which one (20) the Saugleitu: ig upstream of the suction valve and the other (21) connects the pressure line downstream of the pressure = valve with the pump chamber (13), the two bypass lines (20, 21) into the pump chamber at one located directly in front of the piston (15) Place open when this is in its end position, which it occupies before the start of the pressure stroke. (Fig. 6) 4. Adjusting device according to claim 2 or 3, characterized characterized in that the pump piston (15,25) has a in the axial direction extending portion (1), j on which it is tight in the flow tube or in the pumping = j cylinder is guided and that this, preferably at the pressure-side end of the piston (15, 25) beginning Ab = section, has a length that is greater than the maximum piston stroke. (Fig. 6 and 7) 5. Adjusting device according to one of claims 1 to 4, characterized in that the space v) r one side of the working piston (1) with the pressure side and the space in front of the other piston side with the suction side of the pump (7) is connected (Fig. 1 and 2). - 15 - 209832/0239 Pal -1 F I (6Ό ICuOO'KF) 210U57 672/70 6. Adjusting device according to one of claims 1 to 5, characterized in that in which the pressure side of the Working piston (1) opposite space (suction side) of the working cylinder (2) compression springs (6), preferably with a relatively high preload, are arranged on the working piston, one in the axial direction exert effective force (Fig. 1 and 2). "7. Adjusting device according to claim 6, characterized = shows that the working piston (1) has blind holes (10) on one side for receiving and guiding the compression springs (6). (Fig. 1 and 2) 8. Adjusting device according to claim 6 or 7, characterized in that the working piston (1) at its is provided on both sides with identically designed fastening means for the piston rod (3) and the Cylinder (2) is designed so that the compression springs (6) either in one or the other of the through the Pistons (1) can be mounted in separate spaces of the working cylinder (2). (Fig. 1 and 2) 9. Adjusting device according to claim 8, characterized in that the working piston (1) on both sides with a Threaded bore (48) is provided for receiving the piston rod (3). (Fig, 1 and 2) - 10. Adjusting device according to one of claims 1 to 9, characterized in that the working cylinder and the pump form a structural unit. -16- 209832/0239 - 16 - 672/70 y ! I. 11. Adjusting device according to claim 8, 9 or 10, characterized in j characterized in that the pump (7) on the working cylinder ι (2) is so raontbaren that it is optionally in the one ι or the other of the j separated by the piston (1) Cylinder spaces promotes, or from the other or the j one of these cylinder spaces directly or optionally ι ! sucks in via a liquid container (Fig. 1 and 2). 12. Adjusting device according to any one of claims 1, 2, 3, 4, 5 or 10, characterized in that a second electromagnetically operated pump is provided and the arrangement of the liquid lines so is taken that the space in front of one side of the working piston (la) with the pressure side of the first pump (7a), the suction side of the first pump with the suction side "of the second pump (7b) and the pressure side of the second Pump with the space in front of the other side of the working piston. (in series connection) are connected (Fig. 3). j 13. Adjusting device according to claim 12, characterized = shows that in the line routing zv / ischen the suction = sides of the two pumps (7a, 7b) a liquid = container (11) is switched on (Fig. 4). 14. Adjusting device according to one of claims 10 to 13, characterized in that the position and mutual distance of the inlet and outlet openings for the hydraulic fluid on the working cylinder (36) and on the pump (s) and their dimensions are selected as follows: are that a pump (38) can optionally be mounted on the same working cylinder (36), which is in one position in one of the cylinder chambers separated by the working piston and in the position set forward by 180 ° for this purpose in the other dor both "vlindorrMume promotes or - 17 - 209832 / Ü239 210U57 - 17 - 672/70 that two pumps (43, 44) to the working cylinder (36) j can be mounted in such a way that the first (43) with its pressure = lateral outlet opening to one and the second (44) with its outlet opening on the pressure side to the other of the inputs provided on the working cylinder (36) entry or exit openings can be connected. (Fig. 5a, 5b, 5c and 5d) 15. Adjusting device according to claim 14, characterized in that each of the two pumps (43, 44) can be connected with its inlet opening on the suction side to a connecting channel arranged in the working cylinder = M housing or to a common pressure fluid container provided there. (Fig. 5c and 5d) 209632/0239 Blank page