EP2531305B1 - Vibratory drive - Google Patents
Vibratory drive Download PDFInfo
- Publication number
- EP2531305B1 EP2531305B1 EP10801138.8A EP10801138A EP2531305B1 EP 2531305 B1 EP2531305 B1 EP 2531305B1 EP 10801138 A EP10801138 A EP 10801138A EP 2531305 B1 EP2531305 B1 EP 2531305B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic motor
- pressure accumulator
- hydraulic
- pressure
- drive
- 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.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
- B06B1/186—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with rotary unbalanced masses
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
- E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/18344—Unbalanced weights
Definitions
- the present invention relates to a vibration drive of a vibratory roller according to the preamble of patent claim 1.
- a vibratory roller is generally a construction machine and belongs to the group of compactors. With their help, cohesive and non-cohesive soils, bearing and antifreeze layers as well as asphalt can be compacted over a large area.
- the vibrating roller generally has two roller bodies with preferably smooth-coated bandages, in the interior of which a vibration unit for improving the compression result is installed.
- the vibratory roller has the ability to initiate additional energy in addition to its own weight in the underground.
- a vibratory roller of this type is known.
- This has a roller frame to which a propulsion unit is attached and at least one bandage, in the interior of which a vibrating unbalance vibration exciter is arranged.
- the unbalance vibration exciter consists of an imbalance shaft which is set in rotation by a separate drive motor separate from the traction drive motor.
- Both the traction drive motor and the further vibrator drive motor are each designed as hydraulic motors which are fluid-connected via a hydraulic system to a hydraulic pump driven by an internal combustion engine.
- the DE 195 14 985 discloses a vibratory hammer with a memory for short-term storage of excess energy.
- Such hydrostatic drives have at least a hydraulic pump, which is fluidly connected via working lines with a hydraulic motor.
- the downstream connection of the hydraulic motor can optionally be connected to a high-pressure accumulator.
- the hydraulic pump delivers pressure to the hydraulic motor, which accordingly outputs torque to an output shaft to drive an engine and / or a vehicle.
- the hydraulic motor now acts as a pump and promotes pressure medium in the direction of its downstream port.
- the high pressure accumulator is connected to the downstream port of the hydraulic motor to temporarily store the hydraulic fluid delivered by the hydraulic motor (now acting as a hydraulic pump).
- the high-pressure accumulator is connected to the upstream connection of the hydraulic pump and thus delivers high-pressure fluid to the hydraulic pump. This reduces the energy consumption of the hydro-pressure pump.
- the hydraulic accumulator is connected to the upstream port of the hydraulic motor.
- the basic idea of the invention therefore consists in not using the (energy-irrelevant) pushing operation of the vibrating roller from the propulsion motor for energy recovery, but rotatably using the vibration drive of the vibrating roller comprising an unbalance vibration exciter of the vibratory roller driven in at least one preferably driven by the propulsion motor.
- the unbalance vibration generator is mechanically coupled (preferably via an output shaft) with a hydraulic motor or coupled, which in turn can be supplied by a hydraulic pump with a pressure medium via working lines.
- this hydrostatic drive of the unbalance vibration exciter i. h.
- the invention for energy recovery does not provide the propulsion unit, but the vibratory drive as the relevant for the energy recovery drive.
- This vibratory drive can work independently of the propulsion unit even at a standstill of the vibratory roller. It can be effectively used for energy recovery.
- An advantageous embodiment of the invention provides that the hydraulic pump and the hydraulic motor are arranged in a closed circuit, in which in the overrun mode (phasing out of unbalance vibration), the downstream connection of the hydraulic motor and in acceleration mode (start of the imbalance vibrator) of the upstream connection the hydraulic motor with the high pressure accumulator can be fluidly connected.
- another advantageous embodiment of the invention provides that the hydraulic pump and the hydraulic motor are arranged in an open circuit, in which the downstream connection of the hydraulic motor with a tank or with the high-pressure accumulator is fluid-connectable.
- a valve arrangement is provided, via which the high-pressure accumulator is selectively fluid-connectable to the downstream connection of the hydraulic motor or to the upstream connection of the hydraulic motor.
- a low-pressure accumulator is preferably provided, which can be connected in sliding operation of the hydraulic motor with its upstream connection and which can be connected in its drive operation of the hydraulic motor with its downstream connection.
- the connection between the downstream port of the hydraulic motor and the upstream port of the hydraulic pump is maintained continuously.
- the vibration drive has a hydraulic pump 1, whose suction port is fluid-connected to a pressure medium tank 2 and whose Pressure port via a working line 4 with an upstream port of a hydraulic motor 6 is fluidly connected.
- a spring-biased check valve 8 is interposed, which is set in the present case to a working pressure of about 2 bar.
- branches off from the working line 4 a branch line 10 to the pressure medium tank 2, in which an electro-proportionally adjustable pressure relief valve 12 is interposed. This can be adjusted, for example, between 8 bar and 250 bar.
- the downstream port of the hydraulic motor 6 is connected via an electromagnetically actuated two-way two-position switching valve 14 to the pressure medium tank 2.
- an energy recovery line 16 which leads to a biased (biasing pressure, for example, 150 bar) high-pressure accumulator 18.
- an energy recovery valve assembly 20 is interposed.
- This consists according to the present embodiment of an electromagnetically actuated 3-way 3-position switching valve 22 which blocks all connections in a first designed as a spring-centered switching position. In a second shift position, this shift valve 22 connects the downstream port of the hydraulic motor 6 to the high pressure accumulator 18.
- the shift valve 22 connects the high pressure accumulator 18 to an energy return line 24 connected to the upstream port of the hydraulic motor 6 downstream of the check valve 8.
- this return line 24 is also a spring-biased check valve 26 interposed, which is preferably set to 2 bar opening pressure.
- a branch line 28 is connected, leading to the pressure medium tank 2 and in which a pressure relief valve 30 (preferably set to 250 bar) is interposed ,
- the pressure limiting valve 12 is set to a very small value, so that the pressure upstream of the hydraulic motor 6 drops to 6 bar, for example.
- the unbalance vibration generator 34 oscillates or rotates due to its moment of inertia. In this case, a torque is transmitted via the output shaft 32 to the hydraulic motor 6, which now assumes the function of a pump in this case. D. h., The hydraulic motor 6 now promotes pressure fluid from the working line 4 in the direction of pressure medium tank 2.
- An electronic control which also gives the signal of adjustment of the pressure relief valve 12, switches at this moment the 2-position 2-way Switching valve 14 in the closed position and the 3-way 3-position switching valve 22 in the second switching position, in which the downstream port of the hydraulic motor 6 is connected to the high-pressure accumulator 18.
- the high-pressure accumulator 18 is charged, ie, the pressure medium conveyed by the hydraulic motor 6 (now in the function of a pump) is fed into the high-pressure accumulator 18.
- the residual amount that the hydraulic motor does not decrease from the amount of pressure medium delivered by the hydraulic pump 1 flows at low pressure via the pressure relief valve 12 to the tank.
- the 3/3-way switching valve are brought by switching off the one solenoid back to its first switching position and the proportional pressure relief valve 12 is set to a high pressure value. Then the hydraulic motor is supplied by the hydraulic pump with pressure medium.
- valves 22 and 12 can also be switched or adjusted depending on the speed or the change in speed per unit time.
- FIG. 2 shows a second variant of a vibration drive of a vibratory roller according to an open hydraulic circuit design, wherein only the circuit-technical differences compared to the first variant described above will be discussed below mainly.
- a proportional pressure relief valve 12 is arranged in a leading to a pressure medium tank 2 branch line 10, which branches off from the working line 4 between the hydraulic pump 1 and the hydraulic motor 6.
- This proportional pressure relief valve 12 is adjustable in a range of 8 to 250 bar.
- the hydraulic motor 6 is optionally set to shut down. That is, when the vibration drive is to be turned off, the proportional pressure relief valve 12 is set at 8 bar, so that the hydraulic pump 6 conveys substantially directly into the pressure medium tank 2. At this moment, the hydraulic motor 6 is turned off as a torque output means.
- FIG. 2 An alternative embodiment shows the second variant of the open hydraulic circuit design according to the FIG. 2 , Accordingly, the aforementioned proportional pressure relief valve 12 is replaced by a first fixed pressure relief valve 38, which is preferably set to 250 bar, a second fixed pressure relief valve 48 and a directional control valve 46 replaced.
- a bypass line 40 is provided which bypasses the hydraulic motor 6 and the spring-biased check valve 8 upstream of the hydraulic motor 6, ie, connects the output port of the hydraulic pump 1 to the output port of the hydraulic motor 6, and in which a 2-position 2-way Switching valve 42 is joined between.
- This switching valve 42 is biased by a spring in its open position and can be switched electromagnetically in a locked position.
- upstream of said 2-position 2-way switching valve 42 branches off a further branch line 44 from the bypass line 40, which leads to the pressure medium tank 2.
- the 2-way 2-position switching valve 46 is arranged, which is spring-biased in a locking position and which is electromagnetically switchable into an open position.
- the pressure relief valve 48 is arranged downstream, which is preferably set to a value between 10 and 20 bar.
- the 2-way 2-position switching valve 46 is switched from its closed position to the open position.
- the hydraulic pump 1 promotes pressure medium via the branched off from the bypass line 40 branch line 44 in the pressure medium tank 2.
- the energy recovery from the outgoing unbalance vibration generator 34 which applies a torque to the hydraulic motor 6 in this state via the output shaft 32, takes place in Accordance with the vibration drive described above according to the FIG. 1 ,
- the acceleration also takes place according to the exemplary embodiment FIG. 1 ,
- the directional control valve 22 is brought into the switching position, in which the hydraulic accumulator is connected via the check valve 26 to the upstream connection of the hydraulic motor 6.
- the directional control valve 22 are brought into its central position and the directional control valve 46 in its blocking position. Because of the blocking position of the directional valve 46, the pressure relief valve 48 is ineffective and it can build up in the working line 4 a pressure.
- the directional control valve 42 is only in its open switching position when the vibration drive is to be completely switched off, but the hydraulic pump 1 is still driven by a primary unit. Then the hydraulic pump delivers with a very low circulation pressure through the valves 42 and 14 to the tank, so that only very small energy losses.
- the drive of the hydraulic motor 6 in the vibration drive according to the FIG. 1 as well as the FIG. 2 must be designed so that the hydraulic pump 1 when starting the hydraulic motor 6 the Mass moment of inertia of the unbalance vibration generator 34 overcomes.
- the hydraulic pump drive is oversized for the normal operating state of the vibration drive.
- FIG. 3 shows a vibration drive of a vibratory roller in closed hydraulic circuit design. While the basis of the FIGS. 1 and 2 described open hydraulic circuit design is mainly intended for lighter weight vibratory rollers, a vibration drive of the closed hydraulic circuit design is usually provided for heavy vibration rollers with corresponding heavyweight unbalance vibration exciters.
- the imbalance masses can be driven in a simple manner by reversing the conveying direction of a pump which can be pivoted over zero in both directions of rotation. By reversing the direction of rotation, different frequencies and amplitudes of vibration are often realized.
- the vibration drive according to the FIG. 3 has a zero adjustable hydraulic pump 1, which with a drive unit M, beispei mecanic one Internal combustion engine is mechanically connected.
- the hydraulic pump 1 delivers fluid via a working line 4 to at least one hydraulic motor 6, which via an output shaft 32 with a in FIG. 5 shown unbalance vibration exciter 34 is coupled.
- further hydraulic motors can be inserted serially to the above-mentioned hydraulic motor in the working line, such as in the FIG. 3 is shown by the dashed shown second hydraulic motor.
- vibration rollers of the heavy embodiment often have two drums in which an unbalance vibration generator 34 according to the invention is used in each case. In this case, at least two hydraulic motors are required to drive them.
- An output connection of the at least one hydraulic motor 6 is fluid-connected via a return line 50 to an input connection of the hydraulic pump 1. This creates a closed hydraulic circuit. It is understood that in a reverse conveying direction of the hydraulic pump 1, the line 50, the working line and the line 4 is the return line.
- an energy recovery line 16 is arranged, which bypasst the input terminal and the output terminal of the hydraulic motor 6.
- a biased high-pressure accumulator 18 is connected at a branch point.
- two 2-way 2-position switching valves 52/54 interposed such that the junction of the high-pressure accumulator 18 to the recovery line 16 between them two switching valves 52, 54 is located. Both switching valves 52, 54 are each spring-biased in a blocking switching position and can be switched independently of electromagnetically in an open position.
- a feed line 56 is arranged, which also starts from the working line 4 and the return line 50.
- a 3/3-way switching valve 58 is interposed, to which a low-pressure accumulator 60 is connected.
- the switching valve 58 is designed so that it fluid in the lateral switch positions the low-pressure accumulator 60 selectively with the working line 4 or with the return line 50 and in the spring-centered middle position the hydraulic accumulator 60 and the lines 4 and 50 against each other shuts off.
- the low-pressure accumulator 60 In a second switching position of the switching valve 58, the low-pressure accumulator 60 is fluidly connected via the feed line 56 to the working line 4. In a third switching position of the low-pressure accumulator 60 is fluidly connected via the feed line 56 to the return line 50.
- control lines On two control sides of the switching valve 58 control lines are connected, which are fluidly connected on one side with the working line and on the other side with the return line.
- the low-pressure accumulator 60 has a pressure relief line 62, which leads to the pressure medium tank 2 and in which a pressure relief valve 64 is interposed.
- the vibration drive according to the FIG. 3 provided with a compensation pump 66 which is connected to compensate for oil leakage to the hydraulic circuit of the closed design.
- the balance pump 66 is fluidly connected to the pressure medium tank 2 via an intake passage.
- the output connection of the compensation pump 66 opens into a compensation line 68 which fluidly connects the working line 4 and the return line 50 in parallel to the feed line 56 and the recovery line 16.
- a check valve 70 is interposed, which allows only a flow from the balance pump 66 to the working line 4.
- a pressure limiting valve 72 is arranged, which opens in the case of too high a pressure in the working line 4 in the direction of the point of discharge between the equalizing pump 66 and the equalizing line 68.
- a comparable construction can be found in the equalization line 68 between the discharge point and the return line 50.
- D. h. Between the discharge point of the balancing pump 66 in the compensation line 68 and the return line 50 is also a check valve 74 interposed, which allows only a flow in the direction of the return line 50. Parallel to this check valve 74, a pressure relief valve 76 is arranged, which opens in the direction of the discharge point in the event that in the return line 50, an excessively high pressure. By the balancing pump 66, a pressure of 25 to 30 bar is maintained in the respective low pressure line 4 or 50.
- the motor-driven hydraulic pump 1 promotes a working medium via the working line 4 to the upstream connection of the at least one hydraulic motor 6 in order to drive an unbalance vibration generator 34 via its output shaft 32.
- the pressure-released pressure medium is then returned from the downstream end of the at least one hydraulic motor 6 via the return line 50 to the input port of the hydraulic pump 1.
- the two switching valves 52, 54 are in their blocking position.
- the switching valve 58 is due to the pressure in the working line 4 in its third switching position and connects the low pressure accumulator 60 to the return line 50th
- the displacement-variable hydraulic pump 1 is withdrawn (set to zero) with respect to its delivery rate, so that the hydraulic motor 6 no longer outputs torque to the output shaft 32.
- this temporarily (after-running operation) outputs a torque via the output shaft 32 to the hydraulic motor 6, as a result of which it temporarily assumes the function of a pump.
- D. h. The hydraulic motor 6 now promotes pressure medium in the return line 50th
- the switching valve 54 is electromagnetically opened between the high-pressure accumulator 18 and the return line 50, so that the pressure medium temporarily conveyed by the hydraulic motor 6 is fed into the high-pressure accumulator 16.
- the switching valve 54 closes between the high-pressure accumulator 18 and the return line 50. Since, during the pushing operation, pressure medium therefore flows out of the closed circuit This is compensated by appropriate switching of the 3-way 3-position switching valve 58 in the feed line 56, which is in. In the hydraulic circuit and in particular in the working line 4.
- the 2-way 2-position switching valve 52 is opened between the high-pressure accumulator 18 and the working line 4, whereby the compressed in the high-pressure accumulator 18 under pressure pressure medium is fed into the working line 4. In this way, the necessary for starting the hydraulic motor 6 and to overcome the inertia of the unbalance vibration generator 34 power from the high-pressure accumulator 18 can be applied. If the acceleration process is completed from the hydraulic accumulator 18, the valve 52 is brought into its blocking position and the hydraulic pump 1 is pivoted from zero and adjusted to the corresponding speed of the hydraulic motor corresponding delivery volume. The adjustment can in turn be time-dependent or depending on the speed or the speed change of the hydraulic motor. An appropriate speed sensor is in FIG. 4 located.
- the hydraulic pump 1 and its drive M can be designed only for average operation and not for expected peak power, which can occur when starting the hydraulic motor 6.
- the now additionally fed into the closed hydraulic circuit from the high-pressure accumulator 18 pressure medium causes the 3-position 3-way switching valve 58 moves in the feed line 56 in a switching position in which the low-pressure accumulator 60 is now fluidly connected to the return line 50.
- D. h. The excess of pressure medium, which arises by relaxing the high-pressure accumulator 18 in the closed hydraulic circuit is tapped via the low-pressure accumulator 60 and stored there between.
- FIG. 4 Now, a second variant of a hydraulic circuit of the closed design according to the second preferred embodiment is shown. For reasons of simplification, only the variant according to FIG. 3 different embodiments discussed in more detail.
- the stored energy can preferably be used to accelerate the rotating masses of the vibratory drive in vibratory rollers to compensate for power peaks.
- a storage and release of the returned energy can also be done at standstill of the vehicle.
- the vibration drive allows a reduction (reduction) of the maximum drive power to be installed of an internal combustion engine as a drive unit of the hydraulic pump.
- the fuel consumption of a downsized internal combustion engine is reduced.
- the hydraulic pressure accumulators (high-pressure / low-pressure accumulators) can be freely arranged or integrated in / on the vehicle frame.
- the required switching valves and the hydrostatic vibration drive can be controlled electrically or electronically in the system.
- the pressure medium supply of the hydraulic motor from the hydraulic accumulator and from the hydraulic pump is preferably carried out sequentially.
- a vibration drive a vibratory roller with an unbalance vibration exciter, which is at least one rotatable by at least one driven by an external drive or propulsion aggregate bandage of the vibratory roller relative thereto in at least one direction.
- the unbalance vibration generator according to the invention is mechanically coupled to a hydraulic motor, which is supplied by a hydraulic pump with a pressure medium for rotation of the unbalance vibration exciter.
- at least one high-pressure accumulator is provided for receiving pressure medium conveyed by the hydraulic motor in a pushing operation. Furthermore, the high-pressure accumulator feeds pressure medium stored in a drive operation of the hydraulic motor to the hydraulic motor.
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Description
Die vorliegende Erfindung betrifft einen Vibrationsantrieb einer Vibrationswalze gemäß dem Oberbegriff des Patentanspruchs 1.The present invention relates to a vibration drive of a vibratory roller according to the preamble of patent claim 1.
Eine Vibrationswalze ist im Allgemeinen eine Baumaschine und zählt hierbei zur Gruppe der Verdichtungsgeräte. Mit ihrer Hilfe können großflächig bindige- und nichtbindige Böden, Trag- sowie Frostschutzschichten wie auch Asphalt verdichtet werden. Die Vibrationswalze besitzt in der Regel zwei Walzenkörper mit vorzugsweise Glattmantelbandagen, in deren Innerem eine Vibrationseinheit zur Verbesserung des Verdichtungsergebnisses eingebaut ist. Somit erhält die Vibrationswalze die Fähigkeit, neben ihrem Eigengewicht zusätzliche Energie in den Untergrund einzuleiten.A vibratory roller is generally a construction machine and belongs to the group of compactors. With their help, cohesive and non-cohesive soils, bearing and antifreeze layers as well as asphalt can be compacted over a large area. The vibrating roller generally has two roller bodies with preferably smooth-coated bandages, in the interior of which a vibration unit for improving the compression result is installed. Thus, the vibratory roller has the ability to initiate additional energy in addition to its own weight in the underground.
Aus dem Stand der Technik beispielsweise gemäß der
Die
Des Weiteren sind aus dem Stand der Technik beispielsweise gemäß der
Im Fall eines Antriebsbetriebsmodus fördert die Hydropumpe Druckmittel zum Hydromotor, der dementsprechend ein Drehmoment auf eine Abtriebswelle abgibt, um eine Maschine und/oder ein Fahrzeug anzutreiben. Im Falle eines Schiebebetriebs , d. h., in dem Fall, wonach ein Drehmoment von der Abtriebswelle auf den Hydromotor aufgebracht wird, wirkt der Hydromotor nunmehr als Pumpe und fördert Druckmittel in Richtung seines stromabwärtigen Anschlusses. In diesem besonderen Fall wird der Hochdruckspeicher an den stromabwärtigen Anschluss des Hydromotors angeschlossen, um das vom Hydromotor (nunmehr als Hydropumpe wirkend) geförderte Druckmittel temporär zu speichern.In the case of a drive mode of operation, the hydraulic pump delivers pressure to the hydraulic motor, which accordingly outputs torque to an output shaft to drive an engine and / or a vehicle. In the case of a shift operation, d. h., In the case where a torque from the output shaft is applied to the hydraulic motor, the hydraulic motor now acts as a pump and promotes pressure medium in the direction of its downstream port. In this particular case, the high pressure accumulator is connected to the downstream port of the hydraulic motor to temporarily store the hydraulic fluid delivered by the hydraulic motor (now acting as a hydraulic pump).
Sobald der Schiebebetrieb erneut in den Antriebsbetrieb umschlägt und somit der Hydromotor wieder ein Drehmoment an die Antriebswelle abgeben soll, wird der Hochdruckspeicher an den stromaufwärtigen Anschluss der Hydropumpe angeschlossen und gibt somit unter Hochdruck stehendes Druckmittel an die Hydropumpe ab. Hierdurch reduziert sich Energieaufnahme der Hydrodruckpumpe. Bei anderen bekannten hydraulischen Antrieben mit Energierückgewinnung wird der Hydrospeicher mit dem stromaufwärtigen Anschluss des Hydromotors verbunden.As soon as the shift operation again turns into the drive mode and thus the hydraulic motor is again to deliver a torque to the drive shaft, the high-pressure accumulator is connected to the upstream connection of the hydraulic pump and thus delivers high-pressure fluid to the hydraulic pump. This reduces the energy consumption of the hydro-pressure pump. In other known hydraulic drives with energy recovery, the hydraulic accumulator is connected to the upstream port of the hydraulic motor.
Derartige regenerative hydrostatische Antriebssysteme werden im Stand der Technik dazu verwendet, Energie von Fahrzeugen im Schiebebetrieb zurückzugewinnen. Dies ist jedoch bei Vibrationswalzen der vorliegenden Gattung in dieser Form nicht möglich, da Vibrationswalzen im praktischen Einsatz im Wesentlichen nicht in einen energierelevanten Schiebebetrieb gelangen.Such regenerative hydrostatic drive systems are used in the prior art to recover energy from vehicles in coasting mode. However, this is not possible with vibratory rollers of the present type in this form, since vibratory rollers essentially do not reach an energy-relevant pushing operation in practical use.
Angesichts dieser Situation ist es die Aufgabe der vorliegenden Erfindung, für Vibrationswalzen dieser Gattung eine Möglichkeit zur Energierückgewinnung bereitzustellen.In view of this situation, it is the object of the present invention to provide a possibility for energy recovery for vibratory rollers of this type.
Diese Aufgabe wird durch einen Vibrationsantrieb einer Vibrationswalze mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind dabei Gegenstand der Unteransprüche.This object is achieved by a vibration drive of a vibrating roller having the features of patent claim 1. Advantageous developments of the invention are the subject of the dependent claims.
Der Grundgedanke der Erfindung besteht demzufolge darin, nicht den (energieirrelevanten) Schiebebetrieb der Vibrationswalze aus dem Vortriebsmotor zur Energierückgewinnung zu verwenden, sondern den Vibrationsantrieb der Vibrationswalze umfassend einen Unwuchts-Schwingungserreger der in zumindest einer vorzugsweise durch den Vortriebsmotor angetriebenen Bandage der Vibrationswalze drehbar eingesetzt bzw. einsetzbar ist. Der Unwucht-Schwingungserreger ist dabei mit einem Hydromotor mechanisch (vorzugsweise über eine Abtriebswelle) gekoppelt oder koppelbar, der wiederum von einer Hydropumpe mit einem Druckmedium über Arbeitsleitungen versorgbar ist. Erfindungsgemäß ist in diesem hydrostatischen Antrieb des Unwuchtschwingungserregers, d. h., im Vibrationsantrieb zumindest ein Hochdruckspeicher vorgesehen, der zur Aufnahme von von dem Hydromotor in einem Schiebebetrieb, d. h., in einem Auslaufbetrieb des Unwucht-Schwingungserregers gefördertem Druckmedium dient.The basic idea of the invention therefore consists in not using the (energy-irrelevant) pushing operation of the vibrating roller from the propulsion motor for energy recovery, but rotatably using the vibration drive of the vibrating roller comprising an unbalance vibration exciter of the vibratory roller driven in at least one preferably driven by the propulsion motor. can be used. The unbalance vibration generator is mechanically coupled (preferably via an output shaft) with a hydraulic motor or coupled, which in turn can be supplied by a hydraulic pump with a pressure medium via working lines. According to the invention, in this hydrostatic drive of the unbalance vibration exciter, i. h., Provided in the vibration drive at least one high-pressure accumulator, which is for receiving from the hydraulic motor in a pushing operation, d. h., In a discontinued operation of the unbalance vibration generator promoted pressure medium is used.
In anderen Worten ausgedrückt sieht die Erfindung zur Energierückgewinnung nicht das Vortriebsaggregat, sondern den Vibrationsantrieb als den für die Energierückgewinnung relevanten Antrieb vor. Dieser Vibrationsantrieb kann unabhängig vom Vortriebsaggregat auch im Stillstand der Vibrationswalze arbeiten. Er kann effektiv zur Energierückgewinnung genutzt werden.In other words, the invention for energy recovery does not provide the propulsion unit, but the vibratory drive as the relevant for the energy recovery drive. This vibratory drive can work independently of the propulsion unit even at a standstill of the vibratory roller. It can be effectively used for energy recovery.
Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, dass die Hydropumpe sowie der Hydromotor in einem geschlossenen Kreis angeordnet sind, in welchem im Schiebebetrieb (Auslaufbetrieb des Unwucht-Schwingungserregers) der stromabwärtige Anschluss des Hydromotors und im Beschleunigungsbetrieb (Anlaufen des Unwucht-Schwingungserregers) der stromaufwärtige Anschluss des Hydromotors mit dem Hochdruckspeicher fluidverbunden werden kann.An advantageous embodiment of the invention provides that the hydraulic pump and the hydraulic motor are arranged in a closed circuit, in which in the overrun mode (phasing out of unbalance vibration), the downstream connection of the hydraulic motor and in acceleration mode (start of the imbalance vibrator) of the upstream connection the hydraulic motor with the high pressure accumulator can be fluidly connected.
Alternativ hierzu sieht eine andere vorteilhafte Ausgestaltung der Erfindung vor, dass die Hydropumpe sowie der Hydromotor in einem offenen Kreis angeordnet sind, in welchem der stromabwärtige Anschluss des Hydromotors mit einem Tank oder mit dem Hochdruckspeicher fluidverbindbar ist.Alternatively, another advantageous embodiment of the invention provides that the hydraulic pump and the hydraulic motor are arranged in an open circuit, in which the downstream connection of the hydraulic motor with a tank or with the high-pressure accumulator is fluid-connectable.
Im Falle der offenen Hydraulikkreis-Bauform ist eine Ventilanordnung vorgesehen, über die der Hochdruckspeicher wahlweise mit dem stromabwärtigen Anschluss des Hydromotors oder mit dem stromaufwärtigen Anschluss des Hydromotors fluidverbindbar ist. Im Falle der geschlossenen Hydraulikkreis-Bauweise ist vorzugsweise ein Niederdruckspeicher vorgesehen, der im Schiebebetrieb des Hydromotors mit dessen stromaufwärtigem Anschluss verbindbar ist und der im Antriebsbetrieb des Hydromotors mit dessen stromabwärtigen Anschluss verbindbar ist. Vorzugsweise bleibt dabei die Verbindung zwischen dem stromabwärtigen Anschluss des Hydromotors und dem stromaufwärtigen Anschluss der Hydropumpe kontinuierlich erhalten.In the case of the open hydraulic circuit design, a valve arrangement is provided, via which the high-pressure accumulator is selectively fluid-connectable to the downstream connection of the hydraulic motor or to the upstream connection of the hydraulic motor. In the case of the closed hydraulic circuit construction, a low-pressure accumulator is preferably provided, which can be connected in sliding operation of the hydraulic motor with its upstream connection and which can be connected in its drive operation of the hydraulic motor with its downstream connection. Preferably, the connection between the downstream port of the hydraulic motor and the upstream port of the hydraulic pump is maintained continuously.
Die Erfindung wird nachstehend anhand von zwei Ausführungsbeispielen unter Bezugnahme auf die begleitenden Figuren näher erläutert.The invention will be explained in more detail below with reference to two exemplary embodiments with reference to the accompanying figures.
Die
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zeigt einen hydrostatischen Vibarationsantrieb einer Vibrationswalze gemäß dem ersten bevorzugten Ausführungsbeispiel in einer zweiten offenen Hydraulikkreis-Variante,Figur 2 -
zeigt einen hydrostatischen Vibrationsantrieb einer Vibrationswalze gemäß einem zweiten bevorzugten Ausführungsbeispiel der Erfindung in einer ersten geschlossenen Hydraulikkreis-Variante,Figur 3 -
zeigt einen hydrostatischen Vibrationsantrieb einer Vibrationswalze gemäß dem zweiten bevorzugten Ausführungsbeispiel in einer zweiten geschlossenen Hydraulikkreis-Variante undFigur 4 -
Figur 5 schematische Darstellung einer Vibrationswalze.
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FIG. 2 shows a hydrostatic Vibrationationsantrieb a vibratory roller according to the first preferred embodiment in a second open hydraulic circuit variant, -
FIG. 3 shows a hydrostatic vibration drive of a vibratory roller according to a second preferred embodiment of the invention in a first closed hydraulic circuit variant, -
FIG. 4 shows a hydrostatic vibration drive of a vibratory roller according to the second preferred embodiment in a second closed hydraulic circuit variant and -
FIG. 5 schematic representation of a vibrating roller.
Gemäß der
Der stromabwärtige Anschluss des Hydromotors 6 ist über ein elektromagnetisch betätigbares Zweiwege-Zweistellungs-Schaltventil 14 mit dem Druckmitteltank 2 verbindbar. Zwischen dem Schaltventil 14 und dem stromabwärtigen Anschluss des Hydromotors 6 zweigt eine Energierückgewinnungsleitung 16 ab, die zu einem vorgespannten (Vorspanndruck zum Beispiel 150 bar) Hochdruckspeicher 18 führt. In diese Energierückgewinnungsleitung 16 ist vorliegend eine Energierückgewinnungs-Ventilanordnung 20 zwischengeschaltet. Diese besteht gemäß dem vorliegenden Ausführungsbeispiel aus einem elektromagnetisch betätigbaren 3-Wege-3-Stellungs-Schaltventil 22, das in einer ersten als federzentrierte Mittelstellung ausgebildete Schaltposition sämtliche Anschlüsse sperrt. In einer zweiten Schaltposition verbindet dieses Schaltventil 22 den stromabwärtigen Anschluss des Hydromotors 6 mit dem Hochdruckspeicher 18. In einer dritten Schaltposition verbindet das Schaltventil 22 den Hochdruckspeicher 18 mit einer Energierückführleitung 24, die an dem stromaufwärtigen Anschluss des Hydromotors 6 stromab zum Rückschlagventil 8 angeschlossen ist. In dieser Rückführleitung 24 ist ebenfalls ein federvorgespanntes Rückschlagventil 26 zwischengeschaltet, welches vorzugsweise auf 2 bar Öffnungsdruck eingestellt ist.The downstream port of the
Schließlich ist in die Energierückgewinnungsleitung 16 zwischen dem stormabwärtigen Anschluss der Hydropumpe 1 und dem 3-Wege-3-Stellungs-Schaltventil 22 eine Abzweigleitung 28 angeschlossen, die zum Druckmitteltank 2 führt und in die ein Druckbegrenzungsventil 30 (vorzugsweise auf 250 bar eingestellt) zwischengeschaltet ist.Finally, in the
Im Falle eines Antriebsbetriebs des Hydromotors 8, der über eine Abtriebswelle 32 mit einem in
Um den Unwucht-Schwingungserreger 34 abzuschalten, wird das Druckbegrenzungsventil 12 auf einen sehr kleinen Wert eingestellt, so dass der Druck stromauf des Hydromotors 6 zum Beispiel auf 6 bar abfällt. Der Unwuchts-Schwingungserreger 34, schwingt bzw. dreht in Folge seines Massenträgheitsmoments nach. In diesem Fall wird ein Drehmoment über die Abtriebswelle 32 auf den Hydromotor 6 übertragen, der in diesem Fall nunmehr die Funktion einer Pumpe annimmt. D. h., der Hydromotor 6 fördert nunmehr Druckmittel aus der Arbeitsleitung 4 in Richtung Druckmitteltank 2. Eine nicht weiter dargestellte elektronische Steuerung die auch das Signal der Verstellung des Druckbegrenzungsventils 12 gibt, schaltet in diesem Augenblick das 2-Stellungs-2-Wege-Schaltventil 14 in Schließposition und das 3-Wege-3-Stellungs-Schaltventil 22 in die zweite Schaltposition, in welcher der stromabwärtige Anschluss des Hydromotors 6 mit dem Hochdruckspeicher 18 verbunden ist. In diesem Fall wird der Hochdruckspeicher 18 aufgeladen, d. h., das von dem Hydromotor 6 (nunmehr in der Funktion einer Pumpe) geförderte Druckmedium wird in den Hochdruckspeicher 18 geführt. Die Restmenge, die der Hydromotor von der von der Hydropumpe 1 geförderten Druckmittelmenge nicht abnimmt, fließt bei niedrigem Druck über das Druckbegrenzungsventil 12 zum Tank. Entscheidend hierbei ist, dass die Abtriebswelle 32 des Hydromotors 6 an den Unwucht-Schwingungserreger 34 der Vibrationswalze angeschlossen ist, d. h., die Nachlaufenergie des Unwucht-Schwingungserregers 34 genutzt wird, um Energie in Form von Hydraulikdruck im Hochdruckspeicher 18 rückzugewinnen.In order to switch off the
Wird vom Schiebebetrieb wieder in einen Antriebsbetrieb umgeschaltet, d. h., in einen Betrieb, in welchem der Hydromotor 6 ein Drehmoment an die Abtriebswelle 32 abgibt, wird das 2-Wege-2-Stellungs-Schaltventit 14 in die Offenposition geschaltet und das 3-Wege-3-Stellungs-Schaltventil 22 in die dritte Schaltposition geschaltet, in welcher die Verbindung zwischen dem stromabwärtigen Anschluss des Hydromotors 6 und dem Hochdruckspeicher 18 gesperrt und stattdessen eine Verbindung zwischen dem Hochdruckspeicher 18 und dem stromaufwärtigen Anschluss des Hydromotors 6 hersgestellt ist. In dieser Schaltposition gibt also der Hochdruckspeicher 18 Druckmittel unter Druck an die Eingangsseite des Hydromotors 6 ab, so dass dieser unabhängig von der Hydropumpe den Unwucht-Schwingungserreger 34 beschleunigt. In dieser Phase fördert die Hydropumpe zunächst noch mit niedrigem Druck im Umlauf. Nach einer im Bereich von Sekunden liegenden Zeitspanne, die durch Versuche oder durch Rechnung ermittelt werden kann, werden das 3/3-Wegeschaltventil durch Ausschalten des einen Elektromagneten wieder in seine erste Schaltstellung gebracht und das Proportionaldruckbegrenzungsventil 12 auf einen hohen Druckwert eingestellt. Dann wird der Hydromotor von der Hydropumpe mit Druckmittel versorgt.Is switched over from the shift mode back to a drive mode, d. That is, in an operation in which the
Wird die Drehzahl des Hydromotors durch einen Drehzahlgeber erfasst, so können die Ventile 22 und 12 auch in Abhängigkeit von der Drehzahl oder der Änderung der Drehzahl pro Zeiteinheit geschaltet bzw. verstellt werden.If the speed of the hydraulic motor detected by a speed sensor, the
Die
In der vorstehenden ersten Variante ist, wie bereits ausgeführt wurde, ein Proportional-Druckbegrenzungsventil 12 in einer zu einem Druckmediumstank 2 führenden Zweigleitung 10 angeordnet, welche von der Arbeitsleitung 4 zwischen der Hydropumpe 1 und dem Hydromotor 6 abzweigt. Dieses Proportional-Druckbegrenzungsventil 12 ist in einem Bereich von 8 bis 250 bar verstellbar. Mit ihm wird der Hydromotor 6 wahlweise auch außer Betrieb zu gesetzt. D. h., dass wenn der Vibrationsantrieb abgeschaltet werden soll, das Proportional-Druckbegrenzungsventil 12 auf 8 bar gestellt wird, so dass die Hydropumpe 6 im Wesentlichen unmittelbar in den Druckmediumstank 2 fördert. In diesem Augenblick wird der Hydromotor 6 als Drehmomentabgabemittel abgestellt.In the above first variant, as already stated, a proportional
Eine hierzu alternative Ausführungsform zeigt die zweite Variante der offenen Hydraulikkreis-Bauform gemäß der
Auch bei dem Vibrationsantrieb der Vibrationswalze gemäß der
Soll der Vibrationsantrieb abgestellt werden, wird das 2-Wege-2-Stellungs-Schaltventil 46 aus seiner Schließposition in die Offenposition geschaltet. In diesem Fall fördert die Hydropumpe 1 Druckmittel über die von der Bypassleitung 40 abzweigende Zweigleitung 44 in den Druckmediumstank 2. Die Energierückgewinnung aus dem auslaufenden Unwucht-Schwingungserreger 34, der in diesem Zustand über die Abtriebswelle 32 ein Drehmoment an den Hydromotor 6 anlegt, erfolgt in Übereinstimmung mit dem vorstehend beschriebenen Vibrationsantrieb gemäß der
Auch die Beschleunigung erfolgt entsprechend dem Ausführungsbeispiel nach
Das Wegeventil 42 befindet sich nur dann in seiner geöffneten Schaltstellung, wenn der Vibrationsantrieb ganz ausgeschaltet sein soll, die Hydropumpe 1 aber noch von einem Primäraggregat angetrieben wird. Dann fördert die Hydropumpe mit einem sehr niedrigen Umlaufdruck über die Ventile 42 und 14 zum Tank, so dass nur sehr geringe Energieverluste entstehen.The
An dieser Stelle sei noch darauf hingewiesen, dass der Antrieb des Hydromotors 6 beim Vibrationsantrieb gemäß der
Durch die Anordnung des Hochdruckspeichers 18, welcher im Rahmen einer Energierückgewinnung durch das Auslaufen des Unwucht-Schwingungserregers 34 und den damit verbundenen Antrieb des Hydromotors 6 geladen wird, kann dieser für das Anfahren des Hydromotors 6 kurzfristig Energie in das System einspeisen und somit die Hydropumpe 1 entlasten. Dies hat zur Folge, dass der Hydropumpenantrieb hinsichtlich seiner Maximalleistung entsprechend verkleinert werden kann.Due to the arrangement of the high-
Im nachfolgenden wird ein zweites bevorzugtes Ausführungsbeispiel der Erfindung anhand zweier Varianten gemäß der
Die
Weiterhin lassen sich mit einem hydraulischen Antrieb in einem geschlossenen Kreislauf die Unwuchtmassen auf einfache Weise durch Umkehrung der Förderrichtung einer über null verschwenkbaren Pumpe in beide Drehrichtungen antreiben. Durch die Umkehrung der Drehrichtung werden oft unterschiedliche Frequenzen und Amplituden der Vibration realisiert.Furthermore, with a hydraulic drive in a closed circuit, the imbalance masses can be driven in a simple manner by reversing the conveying direction of a pump which can be pivoted over zero in both directions of rotation. By reversing the direction of rotation, different frequencies and amplitudes of vibration are often realized.
Der Vibrationsantrieb gemäß der
An dieser Stelle sei darauf hingewiesen, dass Vibrationswalzen der schweren Ausführungsform häufig zwei Bandagen haben, in welchen ein erfindungsgemäßer Unwucht-Schwingungserreger 34 jeweils eingesetzt ist. In diesem Fall sind mindestens zwei Hydromotoren für deren Antrieb erforderlich.It should be noted at this point that vibration rollers of the heavy embodiment often have two drums in which an
Ein Ausgangsanschluss des zumindest einen Hydromotors 6 ist über eine Rückführleitung 50 mit einem Eingangsanschluss der Hydropumpe 1 fluidverbunden. Hierdurch entsteht ein geschlossener Hydraulikkreis. Es versteht sich, dass bei einer umgekehrten Förderrichtung der Hydropumpe 1 die Leitung 50 die Arbeitsleitung und die Leitung 4 die Rückführleitung ist. Parallel zu dem zumindest einen Hydromotor 6 ist eine Energierückgewinnungsleitung 16 angeordnet, welche den Eingangsanschluss sowie den Ausgangsanschluss des Hydromotors 6 bypasst. An die Rückgewinnungsleitung 16 ist ein vorgespannter Hochdruckspeicher 18 in einem Verzweigungspunkt angeschlossen. Des Weiteren sind in der Rückgewinnungsleitung 16, welche faktisch die Arbeitsleitung 4 und die Rückführleitung 50 miteinander verbindet, zwei 2-Wege-2-Stellungs-Schaltventile 52/54 zwischengefügt, derart, dass sich die Anschlussstelle des Hochdruckspeichers 18 an die Rückgewinnungsleitung 16 zwischen diesen beiden Schaltventilen 52, 54 befindet. Beide Schaltventile 52, 54 sind jeweils in eine Sperrschaltposition federvorgespannt und können elektromagnetisch unabhängig voneinander in eine Offenposition geschaltet werden. Parallel zu der Rückgewinnungsleitung 16 ist eine Speiseleitung 56 angeordnet, die ebenfalls von der Arbeitsleitung 4 und der Rückführleitung 50 ausgeht. In die Speiseleitung 56 ist ein 3/3-Wegeschaltventil 58 zwischengefügt, an welches ein Niederdruckspeicher 60 angeschlossen ist. Das Schaltventil 58 ist dabei so ausgebildet, dass es in den seitlichen Schaltstellungen den Niederdruckspeicher 60 wahlweise mit der Arbeitsleitung 4 oder mit der Rückführleitung 50 fluidverbindet und in der federzentrierten Mittelstellung den Hydrospeicher 60 und die Leitungen 4 und 50 gegeneinander absperrt.An output connection of the at least one
In einer zweiten Schaltposition des Schaltventils 58 wird der Niederdruckspeicher 60 über die Speiseleitung 56 mit der Arbeitsleitung 4 fluidverbunden. In einer dritten Schaltposition wird der Niederdruckspeicher 60 über die Speiseleitung 56 mit der Rückführleitung 50 fluidverbunden.In a second switching position of the switching
An zwei Steuerseiten des Schaltventils 58 sind Steuerleitungen angeschlossen sind, die an einer Seite mit der Arbeitsleitung und an der anderen Seite mit der Rückführleitung fluidverbunden sind. Schließlich hat der Niederdruckspeicher 60 eine Druckentlastungsleitung 62, die zum Druckmediumstank 2 führt und in welcher ein Druckbegrenzungsventil 64 zwischengeschaltet ist.On two control sides of the switching
Schließlich ist der Vibrationsantrieb gemäß der
Im Konkreten ist die Ausgleichspumpe 66 über einen Ansaugkanal mit dem Druckmediumstank 2 fluidverbunden. Der Ausgangsanschluss der Ausgleichspumpe 66 mündet in eine Ausgleichsleitung 68, welche die Arbeitsleitung 4 und die Rückführleitung 50 parallel zu der Speiseleitung 56 bzw. der Rückgewinnungsleitung 16 fluidverbindet. Zwischen der Mündungsstelle der Ausgleichspumpe 66 in die Ausgleichsleitung 68 und der Arbeitsleitung 4 ist ein Rückschlagventil 70 zwischengeschaltet, welches nur eine Strömung von der Ausgleichspumpe 66 zur Arbeitsleitung 4 zulässt. Parallel zum Rückschlagventil 70 ist ein Druckbegrenzungsventil 72 angeordnet, welches im Falle eines zu hohen Drucks in der Arbeitsleitung 4 in Richtung zur Mündungsstelle zwischen Ausgleichspumpe 66 und Ausgleichsleitung 68 öffnet.Specifically, the
Eine vergleichbare Konstruktion findet sich in der Ausgleichsleitung 68 zwischen der Mündungsstelle und der Rückführleitung 50. D. h., zwischen der Mündungsstelle der Ausgleichspumpe 66 in die Ausgleichsleitung 68 und der Rückführleitung 50 ist ebenfalls ein Rückschlagventil 74 zwischengefügt, welches lediglich eine Strömung in Richtung zur Rückführleitung 50 zulässt. Parallel zu diesem Rückschlagventil 74 ist ein Druckbegrenzungsventil 76 angeordnet, welches für den Fall, dass in der Rückführleitung 50 ein zu hoher Druck herrscht, in Richtung zur Mündungsstelle hin öffnet. Durch die Ausgleichspumpe 66 wird in der jeweiligen Niederdruckleitung 4 oder 50 ein Druck von 25 bis 30 bar aufrechterhalten.A comparable construction can be found in the
Im normalen Betrieb fördert die motorgetriebene Hydropumpe 1 ein Arbeitsmedium über die Arbeitsleitung 4 zum stromaufwärtigen Anschluss des zumindest einen Hydromotors 6, um über dessen Abtriebswelle 32 einen Unwucht-Schwingungserreger 34 anzutreiben. Das druckentspannte Druckmedium wird anschließend vom stromabwäritgen Anschluss des zumindest einen Hydromotors 6 über die Rückführleitung 50 zum Eingangsanschluss der Hydropumpe 1 zurückgeleitet. Im normalen Betrieb befinden sich die beiden Schaltventile 52, 54 in ihrer Sperrstellung. Das Schaltventil 58 befindet sich aufgrund des Drucks in der Arbeitsleitung 4 in seiner dritten Schaltstellung und verbindet den Niederdruckspeicher 60 mit der Rückführleitung 50.In normal operation, the motor-driven hydraulic pump 1 promotes a working medium via the working
Soll nunmehr der zumindest eine Hydromotor 6 abgeschaltet werden, wird die verdrängungsvariable Hydropumpe 1 bezüglich ihrer Förderleistung zurückgenommen (auf null gesetzt), so dass der Hydromotor 6 nunmehr kein Drehmoment an die Abtriebswelle 32 mehr abgibt. In Folge der Masseträgheit des zumindest einen Unwucht-Schwingungserregers 34 gibt dieser jedoch temporär (Nachlaufvorgang) ein Drehmoment über die Abtriebswelle 32 an den Hydromotor 6 ab, wodurch dieser zeitweilig die Funktion einer Pumpe annimmt. D. h., der Hydromotor 6 fördert nunmehr Druckmedium in die Rückführleitung 50.If now the at least one
In diesem Fall wird das Schaltventil 54 zwischen dem Hochdruckspeicher 18 und der Rückführleitung 50 elektromagnetisch geöffnet, so dass das vom Hydromotor 6 temporär geförderte Druckmedium in den Hochdruckspeicher 16 eingespeist wird. Sobald dieser Nachlauf- bzw. Schiebebetrieb des Hydromotors 6 beendet ist, schließt das Schaltventil 54 zwischen Hochdruckspeicher 18 und Rückführleitung 50. Da während des Schiebebetriebes folglich Druckmedium aus dem geschlossenen Hydraulikkreis entnommen und im Hochdruckspeicher 18 unter Druck gebunkert wird, entsteht ein Druckmediumsmangel (Unterdruck) im Hydraulikkreis und insbesondere in der Arbeitsleitung 4. Dies wird durch entsprechendes Schalten des 3-Wege-3-Stellungs-Schaltventils 58 in der Speiseleitung 56 ausgeglichen, welches in Folge einer sich einstellenden Druckdifferenz zwischen Arbeitsleitung 4 und der Rückführleitung 50 in seine zweite Schaltposition geschaltet wird, in welcher der Niederdruckspeicher 60 mit der Arbeitsleitung 4 fluidverbunden wird. D. h., das im Hochdruckspeicher 18 temporär gespeicherte Druckmedium wird im geschlossenen Hydraulikkreis über den Niederdruckspeicher 60, zusätzlich aber auch durch die Ausgleichspumpe 66 ausgeglichen.In this case, the switching
Sobald der normale Antriebsbetrieb des zumindest einen Hydromotors 6 anlaufen soll, wird das 2-Wege-2-Stellung-Schaltventil 52 zwischen dem Hochdruckspeicher 18 und der Arbeitsleitung 4 geöffnet, wodurch das im Hochdruckspeicher 18 unter Druck gebunkerte Druckmedium in die Arbeitsleitung 4 eingespeist wird. Auf diese Weise kann die zum Anfahren des Hydromotors 6 sowie zur Überwindung der Massenträgheit des Unwucht-Schwingungserregers 34 notwendige Leistung vom Hochdruckspeicher 18 aufgebracht werden. Ist der Beschleunigungsvorgang aus dem Hydrospeicher 18 abgeschlossen, werden das Ventil 52 in seine Sperrstellung gebracht und die Hydropumpe 1 von null her ausgeschwenkt und auf das der gewünschten Drehzahl des Hydromotors entsprechende Fördervolumen verstellt. Die Verstellung kann dabei wiederum zeitabhängig oder in Abhängigkeit von der Drehzahl oder der Drehzahländerung des Hydromotors erfolgen. Ein entsprechender Drehzahlgeber ist in
Sollte in dem geschlossenen Hydraulikkreissystem eine Druckmediumsleckage auftreten, führt dies dazu, dass der von der Ausgleichspumpe 66 an den jeweiligen Rückschlagventilen 70, 74 aufgebaute Hydraulikdruck ein Öffnen des einen oder anderen Rückschlagventils in Richtung zur Arbeitsleitung 4 oder zur Rückführleitung 50 führt, wodurch die entsprechende Leckage ausgeglichen wird.Should a pressure medium leakage occur in the closed hydraulic circuit system, this causes the hydraulic pressure built up by the equalizing
In der
Wie aus der
Mit dem erfindungsgemäßen Vibrationsantrieb, der anhand der vorstehenden zwei Ausführungsbeispiele beschrieben wurde, lassen sich die folgenden Vorteile erzielen:With the vibration drive according to the invention, which has been described with reference to the above two embodiments, the following advantages can be achieved:
Eine Energierückgewinnung bei einer Vibrationswalze ist nunmehr möglich durch Speicherung der rotatorischen Energie aus dem Vibrationsantrieb bzw. aus den Unwuchtmassen.An energy recovery in a vibratory roller is now possible by storing the rotational energy from the vibration drive or from the imbalance masses.
Die gespeicherte Energie kann vorzugsweise zur Beschleunigung der rotierenden Massen des Vibrationsantriebs bei Vibrationswalzen genutzt werden, um Leistungsspitzen auszugleichen.The stored energy can preferably be used to accelerate the rotating masses of the vibratory drive in vibratory rollers to compensate for power peaks.
Es findet keine hydraulische Verbindung/Kopplung zwischen dem Vibrationsantrieb und dem Fahrantrieb einer Vibrationswalze statt.There is no hydraulic connection / coupling between the vibration drive and the drive of a vibrating roller instead.
Es erfolgt keine Nutzung der translatorischen Energie des Fahrzeugs, welche energetisch irrelevant ist, da Fahrzeuge wie die Vibrationswalze im Arbeitsmedium ohne Antrieb unverzüglich selbständig verzögert werden.There is no use of the translational energy of the vehicle, which is energetically irrelevant because vehicles such as the vibratory roller in the working medium without drive are immediately delayed independently.
Eine Speicherung und Freisetzung der rückgeführten Energie kann auch im Stillstand des Fahrzeuges erfolgen.A storage and release of the returned energy can also be done at standstill of the vehicle.
Eine Realisierung des Vibrationsantriebs mit Energierückführung ist mit einfachen handelsüblichen Ventilen möglich.A realization of the vibration drive with energy feedback is possible with simple commercially available valves.
Der Vibrationsantrieb ermöglicht eine Verringerung (Reduzierung) der zu installierenden maximalen Antriebsleistung einer Brennkraftmaschine als Antriebsaggregat der Hydropumpe.The vibration drive allows a reduction (reduction) of the maximum drive power to be installed of an internal combustion engine as a drive unit of the hydraulic pump.
Es wird ein geringerer Bedarf an Einbauraum durch eine kleinere Brennkraftmaschine erforderlich.There is a lesser need for installation space required by a smaller internal combustion engine.
Der Treibstoffverbrauch einer verkleinerten Brennkraftmaschine ist reduziert.The fuel consumption of a downsized internal combustion engine is reduced.
Die Hydraulikdruckspeicher (Hochdruck-/Niederdruckspeicher) können frei im/am Fahrzeugrahmen angeordnet oder integriert werden.The hydraulic pressure accumulators (high-pressure / low-pressure accumulators) can be freely arranged or integrated in / on the vehicle frame.
Die erforderlichen Schaltventile sowie der hydrostatische Vibrationsantrieb können im System elektrisch bzw. elektronisch angesteuert sein.The required switching valves and the hydrostatic vibration drive can be controlled electrically or electronically in the system.
Beim Beschleunigen des Unwucht-Schwingungserregers erfolgt die Druckmittelversorgung des Hydromotors aus dem Hydrospeicher und von der Hydropumpe vorzugsweise sequentiell.When accelerating the unbalance vibration exciter, the pressure medium supply of the hydraulic motor from the hydraulic accumulator and from the hydraulic pump is preferably carried out sequentially.
Offenbart wird ein Vibrationsantrieb einer Vibrationswalze mit einem Unwucht-Schwingungserreger, der in zumindest einer durch ein externes Antriebs- oder Vortriebsaggregat betriebene Bandage der Vibrationswalze relativ zu dieser in mindestens eine Richtung drehbar einsetzbar ist. Der Unwucht-Schwingungserreger ist erfindungsgemäß mit einem Hydromotor mechanisch gekoppelt, der von einer Hydropumpe mit einem Druckmedium zur Rotation des Unwucht-Schwingungserregers versorgbar ist. Ferner ist zumindest ein Hochdruckspeicher vorgesehen zur Aufnahme von vom Hydromotor in einem Schiebebetrieb gefördertem Druckmedium. Des Weiteren speist der Hochdruckspeicher in einem Antriebsbetrieb des Hydromotors gespeichertes Druckmedium an den Hydromotor ein.Disclosed is a vibration drive a vibratory roller with an unbalance vibration exciter, which is at least one rotatable by at least one driven by an external drive or propulsion aggregate bandage of the vibratory roller relative thereto in at least one direction. The unbalance vibration generator according to the invention is mechanically coupled to a hydraulic motor, which is supplied by a hydraulic pump with a pressure medium for rotation of the unbalance vibration exciter. Furthermore, at least one high-pressure accumulator is provided for receiving pressure medium conveyed by the hydraulic motor in a pushing operation. Furthermore, the high-pressure accumulator feeds pressure medium stored in a drive operation of the hydraulic motor to the hydraulic motor.
Claims (10)
- Vibratory drive of a vibrating roller, comprising an unbalance vibrator (34) which can be inserted so as to be relatively rotatable in at least one direction in at least one drum (36), driven by an external drive unit, of the vibrating roller, wherein the unbalance vibrator (34) is mechanically coupled to a hydraulic motor (6) which can be supplied with a pressure medium by a hydraulic pump (1) in order to rotate the unbalance vibrator (34), characterized in that at least one high pressure accumulator (18) is provided for accommodating pressure medium which is delivered by the hydraulic motor (6) in an overrun mode.
- Vibratory drive according to Claim 1, characterized in that in a drive mode of the hydraulic motor (6) the high pressure accumulator (18) feeds stored pressure medium to the hydraulic motor (6).
- Vibratory drive according to Claim 1 or 2, characterized in that the hydraulic pump (1) and the hydraulic motor (6) are arranged in an open circuit in which the downstream connection of the hydraulic motor (6) can be optionally fluidically connected to a tank (2) or to the high pressure accumulator (18).
- Vibratory drive according to Claim 3, characterized in that the high pressure accumulator (18) can be fluidically connected to the tank (2) via a pressure-limiting valve (30).
- Vibratory drive according to one of the preceding claims, characterized by a valve arrangement (20) via which the high pressure accumulator (18) can be optionally fluidically connected to the downstream connection of the hydraulic motor (6) or to the upstream connection of the hydraulic motor (6).
- Vibratory drive according to Claim 1 or 2, characterized in that the hydraulic pump (1) and the hydraulic motor (6) are arranged in a closed circuit in which the downstream connection of the hydraulic motor (6) is fluidically connected to the high pressure accumulator (18) in the overrun mode, and the upstream connection of the hydraulic motor (6) is connected to the high pressure accumulator (18) in the drive mode.
- Vibratory drive according to Claim 6, characterized by a low pressure accumulator (60) which, in the overrun mode of the hydraulic motor (6) can be connected to the upstream connection thereof, and in the drive mode of the hydraulic motor (6) can be connected to the downstream connection thereof.
- Vibratory drive according to claim 6 or 7, characterized in that a recovery valve arrangement (20) is connected upstream of the high pressure accumulator (18), in order to optionally fluidically connect the high pressure accumulator (18) to the upstream or downstream connection of the hydraulic motor (6).
- Vibratory drive according to one of Claims 6 to 8, characterized in that a pressure medium-equalizing valve arrangement (82) is connected upstream of the low pressure accumulator (60) in order to optionally fluidically connect the low pressure accumulator (60) to the upstream or downstream connection of the hydraulic motor (6).
- Vibratory drive according to Claims 8 and 9, characterized by a valve controller for controlling the pressure medium-equalizing valve arrangement (82) as a function of the switched position of the recovery valve arrangement (20).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010006993A DE102010006993A1 (en) | 2010-02-05 | 2010-02-05 | vibration drive |
PCT/EP2010/007884 WO2011095200A2 (en) | 2010-02-05 | 2010-12-22 | Vibratory drive |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2531305A2 EP2531305A2 (en) | 2012-12-12 |
EP2531305B1 true EP2531305B1 (en) | 2015-03-18 |
Family
ID=43618041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10801138.8A Not-in-force EP2531305B1 (en) | 2010-02-05 | 2010-12-22 | Vibratory drive |
Country Status (5)
Country | Link |
---|---|
US (1) | US9782800B2 (en) |
EP (1) | EP2531305B1 (en) |
CN (1) | CN102791389B (en) |
DE (1) | DE102010006993A1 (en) |
WO (1) | WO2011095200A2 (en) |
Families Citing this family (15)
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DE102013103722B4 (en) * | 2013-04-12 | 2016-10-13 | Thyssenkrupp Tiefbautechnik Gmbh | Vibration ramming arrangement and method for operating the vibration ram assembly |
CN105829609B (en) * | 2013-12-16 | 2018-02-27 | 沃尔沃建筑设备公司 | For driving the hydraulic system of vibrating mechanism |
DE102013227032A1 (en) | 2013-12-20 | 2015-06-25 | Hamm Ag | Drive system, in particular for a self-propelled construction machine, in particular soil compactor |
DE102013227007B4 (en) * | 2013-12-20 | 2024-05-16 | Hamm Ag | Self-propelled construction machinery, especially soil compactors |
CN104195926B (en) * | 2014-08-13 | 2017-04-19 | 潍柴动力股份有限公司 | Road roller, hydraulic system of road roller, and control method for hydraulic system |
CN104329299B (en) * | 2014-10-27 | 2016-11-16 | 潍柴动力股份有限公司 | A kind of road roller vibration energy regeneration reutilization system and method |
DE102016201971B4 (en) * | 2016-02-10 | 2021-04-22 | Robert Bosch Gmbh | Hydraulic drive device with load-dependent pressure divider |
US10000895B2 (en) * | 2016-10-06 | 2018-06-19 | Caterpillar Inc. | Rotating hydraulic gear motor |
CN110248849B (en) * | 2016-12-21 | 2022-10-25 | A&A国际有限公司 | Integrated energy conversion, transfer and storage system |
CN115638142A (en) | 2016-12-21 | 2023-01-24 | A&A国际有限公司 | Integrated energy conversion, transfer and storage system |
US10584449B2 (en) | 2018-07-03 | 2020-03-10 | Caterpillar Inc. | Start assist for a vibratory system of a compactor |
DE102019002439A1 (en) * | 2019-04-03 | 2020-10-08 | Bomag Gmbh | Soil compacting machine with electric motor and method of operation |
DE102021200285A1 (en) * | 2021-01-14 | 2022-07-14 | Robert Bosch Gesellschaft mit beschränkter Haftung | Compaction vehicle in which a travel drive and a vibration unit are supplied with pressurized fluid from a common supply point |
CZ309275B6 (en) | 2021-03-03 | 2022-07-06 | Ammann Schweiz Ag | A method of safely controlling a compaction machine and a compaction machine for this |
DE102021206135A1 (en) | 2021-06-16 | 2022-12-22 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hydrostatic drive for a roller and method for power distribution of such a drive |
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US3867073A (en) * | 1972-09-20 | 1975-02-18 | Raygo Inc | Control for fluid motor |
DE4033793A1 (en) | 1990-10-24 | 1992-04-30 | Wacker Werke Kg | Vibrating roller with steel face and hollow shaft - has integral vibrator and common lubricating chamber for respective bearings |
DE19514985A1 (en) * | 1995-04-24 | 1996-10-31 | Bald Hubert | Equipment with short-term energy storage |
CN2455762Y (en) * | 2000-02-29 | 2001-10-24 | 陕西省水利机械厂 | Tracted vibration road roller with mono-side drive |
DE102005060994B4 (en) * | 2005-12-20 | 2009-04-09 | Bosch Rexroth Aktiengesellschaft | Hydrostatic drive with recovery of braking energy |
DE102006060014B4 (en) | 2005-12-20 | 2009-05-14 | Bosch Rexroth Aktiengesellschaft | Hydrostatic drive with recovery of braking energy |
DE102006050873A1 (en) | 2006-10-27 | 2008-04-30 | Robert Bosch Gmbh | Hydrostatic drive i.e. traction drive, for e.g. wheel loader, has hydraulic pump and hydraulic motor arranged in open circuit, where downstream connection of hydraulic motor is connected with tank volume or storage unit by valve device |
CN101265686A (en) * | 2007-03-13 | 2008-09-17 | 徐州工程机械科技股份有限公司 | Vibrated roller hydraulic electric appliance control system |
DE102008057897A1 (en) * | 2007-11-20 | 2009-05-28 | Robert Bosch Gmbh | Hydrostatic drive and method of operating a vehicle |
CN101613987B (en) * | 2009-06-22 | 2012-01-18 | 赵铁栓 | Stepless adjustable vibration generator of vibrating roller |
-
2010
- 2010-02-05 DE DE102010006993A patent/DE102010006993A1/en not_active Withdrawn
- 2010-12-22 EP EP10801138.8A patent/EP2531305B1/en not_active Not-in-force
- 2010-12-22 US US13/576,752 patent/US9782800B2/en not_active Expired - Fee Related
- 2010-12-22 WO PCT/EP2010/007884 patent/WO2011095200A2/en active Application Filing
- 2010-12-22 CN CN201080063182.7A patent/CN102791389B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
WO2011095200A3 (en) | 2012-04-19 |
DE102010006993A1 (en) | 2011-08-11 |
EP2531305A2 (en) | 2012-12-12 |
CN102791389B (en) | 2014-11-19 |
CN102791389A (en) | 2012-11-21 |
WO2011095200A2 (en) | 2011-08-11 |
US20130025385A1 (en) | 2013-01-31 |
US9782800B2 (en) | 2017-10-10 |
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