EP2831427B1 - Hydraulic rotary drive device - Google Patents

Description

The invention relates to a hydro-rotary oscillator, with a driven by a hydro-fluid flow hydro-rotary actuator having a fully cylindrical rotary actuator inner part and at least one hollow cylindrical rotary actuator outer part, which are arranged concentrically to each other with a radial distance, at least two annular segment-shaped working chambers radially and rotatable relative to each other in two directions of rotation, wherein the working chambers are separated and resized by a co-rotating radially extending rotary actuator wall and are connected to the at least one hydro-rotary pump via hydraulic connection lines, and at least one control means the hydro-fluid flow alternately to the at least two working chambers, wherein the at least one rotary actuator outer part is rotatable and the rotary actuator inner part rotatably formed, wherein the hydro-rotary actuator a rotary actuator inner part u nd has at least two juxtaposed rotary actuator outer parts.

Such hydraulic rotary drive devices, with a hydro-fluid flow driven hydro-rotary actuator are known in the prior art in various embodiments. Common hydraulic rotary pumps usually produce a quasi-continuous fluid flow from a hydraulic fluid, which also remains constant in the rule, if by resistors such as throttles, switching elements or drives in the hydraulic system builds up a pressure. Such hydraulic pumps are usually designed as vane, gear or screw pumps and can operate in an open or closed circuit. In the closed circuit, the hydro-rotary pump with its suction side and with its pressure side, depending on the number of working chambers of the hydro-actuator, at the same time directly or alternately via a control means, such as a hydraulic multi-way valve, connected to the hydro-actuator. Hydro actuators are known as axial piston or rotary piston actuators. Known hydro-rotary actuators have a rotor and a stator, usually one in a housing (stator) sealed rotatably mounted rotary piston (rotor). Such hydro-rotary actuators usually have at least two working chambers, which are formed by an annular gap portion between the housing and the rotary piston. The working chambers are radially bounded by the housing and the rotary piston and in the circumferential direction of stops of the housing and a rotary wing extension of the rotary piston, which extend radially.

Such a hydro-rotary actuator is disclosed in the publication DE 102 10 756 A1 known. This document discloses a rotary piston device with a cylindrical housing which is sealed frontally with bearing caps and in which a piston shaft rotary bearing is finally rotatable in both directions up to a maximum rotationally fixed stop body with two lateral stops, the stopper body substantially medium tight between the cylinder wall and the Piston shaft and with respect to the bearing cap is arranged. The rotary piston has a radially extending blade extension, which, together with the stopper body, divides the total displacement as a function of the position of the rotary piston into two working chambers, a pressure chamber and a suction chamber. The two working chambers are used alternately as a pressure and suction chamber, ie alternately connected to the pressure and the suction side of a hydro-rotary pump, for example via a hydraulic multi-way valve.

A disadvantage is considered in this known hydraulic rotary drive device that the rotor is arranged inside and thus the coupling with a lever arm or the like of an external device is difficult, and that the hydro-rotary pump indirectly via at least one switching valve with the two working chambers of the hydraulic rotary actuator connected, which reduces the maximum oscillation speed of the rotary piston.

The prior art will continue to the document US 3,196,934 directed. This document discloses a hydraulic rotary piston assembly for pivoting two parts pivotable relative to each other and relative to a common axis, wherein two rotary engines are arranged on a common shaft and the rotary engines are provided with cooperating radial blades. The wings are arranged on the shaft and on the housing of the rotary piston engines and the parts to be pivoted are each secured to one of the housings. The arrangement of the radial wings is such that the two parts are pivotable in opposite directions of rotation, wherein the common shaft is freely rotatably mounted.

Based on the above-mentioned prior art, the invention has for its object to propose a possibility with which a fin drive for a watercraft can be realized.

This object is achieved by a hydro-rotary oscillator with the features of claim 1. Further advantageous embodiments can be found in the dependent claims.

Thereafter, the hydro-rotary actuator is an external rotor. According to the invention, the rotary actuator outer part is rotatable as a rotor and the rotary actuator inner part rotatably formed as a stator. The rotary actuator inner part forms an immovable axle shaft, which carries the three rotary actuator outer parts in the circumferential direction pivotally. The rotary actuator outer parts are sealed rotatably mounted on the rotary actuator inner part and in two directions of rotation relative to the Rotary actuator inner part stop limited rotation. This results in a structurally simpler design of the hydro-rotary actuator over the prior art, with an improved access to the rotor by the respective movable rotary actuator outer part allows a direct mechanical coupling of an external device on the outer peripheral surface. For this purpose, there can be provided suitable connecting elements, for example threaded bushes or threaded pins. This also allows a shorter in the axial direction design, since the coupling does not have to take place next to the rotor, as is the case with an internal rotary piston. According to the invention moves at least one of the rotary actuator outer parts on the rotary actuator inner part out of phase with at least one other rotary actuator outer part, preferably opposite. This can be achieved by suitable control of the working chambers via a plurality of controllable hydraulic valves and / or via corresponding hydraulic throttles. If necessary, the common rotary actuator inner part may have further main flow channels.

In this case, the hydro-rotary oscillator according to the invention on a rotary actuator with three rotary actuator outer parts, wherein the central rotary actuator outer part always moves in the opposite direction of the two outer rotary actuator outer parts and formed on each of the rotary actuator outer parts, an outer part extension and on Each of the outer part extensions a fin is attached or molded. The hydro-fluid flow driving the hydro-rotary actuator is continuously oscillating and is generated by two hydro-rotary pumps continuously driven by a common drive motor. The two hydro-rotary pumps are connected in parallel to each other and to the hydraulic rotary actuator fluidly. Each of the hydro-rotary pumps includes a hemisphere-shaped cavity filled with a hydro-fluid comprising a circular raised cavity bottom plate, a rotatably driven spherical segment disposed in the cavity with a planar spherical segment bottom and a spherical spherical segment cap, a spherical wedge shaped space between the raised bottom plate and the spherical segment bottom , with a drive axis of the ball segment extending as a rotation axis perpendicular to the cavity bottom plate and inclined with respect to the central center axis of the ball segment and aligned with the center of the cavity bottom plate, with a center perpendicular to the cavity bottom plate recessed, the spherical segment bottom with a contact edge contacting pendulum plate which is pivotable about a virtual pivot of the pendulum plate in the middle of the abutment edge, and with passage channels for the hydro-fluid on both sides of the pendulum plate in the cavity bottom plate for transporting the hydro-fluid from and into the Gap between the cavity bottom plate and the spherical segment bottom.

The oscillation frequency of the hydro-fluid flow is variable via the freely adjustable rotational speed of the two hydro-rotary pumps, wherein the and pressure of the hydro-rotary actuator driving oscillating hydro-fluid flow over the phase position of the rotating spherical segments of the two hydro-rotary pumps is variably adjustable by means of a phase adjustment , The phase angle of the rotating spherical segments of the two hydro-rotary pumps is preferably mutually variable between 0 ° and 180 °, wherein the dependent on the phase angle of the pivot angle of the at least three rotary actuator outer parts relative to the rotary actuator inner part between zero degrees and that determined by the rotary stops Degree variable variable.

The hydraulic fluid flow leading hydro-connecting lines preferably lead to the rotatably mounted rotary actuator inner part, since these can then be performed rigid. The connection of the hydro-connecting lines to the at least one first and second working chamber of the hydro-rotary actuator is carried out in a preferred embodiment of the invention via two axially extending in the fully cylindrical rotary actuator inner part main flow channels, from which each side secondary flow channels extend one of the working chambers. The main and the secondary flow channels are formed, for example, as bores, wherein the secondary flow channels transverse to the main flow channels, preferably perpendicular thereto.

In one embodiment of the invention, the working chambers of out of phase moving rotary actuator outer parts are in opposite directions and the working chambers of in-phase moving rotary actuator outer parts in the same direction directly or indirectly connected to the main flow channels.

In one embodiment of the invention, the hydro-rotary actuator at at least one of the rotary actuator outer parts on a third and a fourth working chamber, which are diametrically opposed to the first and the second working chamber. Through the other working chambers, the pivoting force of the hydro-rotary actuator is increased accordingly. The third and the fourth working chamber are directly or indirectly coupled to the first and second working chamber and increase the working volume of the hydraulic rotary actuator and thus its pivotal moment. In principle, further working chambers may be arranged in pairs in the circumferential direction of the hydro-rotary actuator following the third and fourth working chamber, provided that sufficient space is available. Also in this case is the arrangement of all working chambers preferably symmetrical. The further working chambers are fluid-technically coupled to the first and second working chambers, as are the third and fourth working chambers.

Preferably, the third and the fourth working chamber is connected crosswise indirectly via secondary flow channels leading to the main flow channels or directly via additional transverse flow channels to the first and second working chamber, respectively. The additional transverse flow channels extend in the axial direction of the hydro-rotary actuator longitudinally offset from each other and to the secondary flow channels and generally inclined to the secondary flow channels. The four working chambers of the hydro-rotary actuator are arranged one after the other in the circumferential direction of the hydro-rotary actuator and consecutively numbered accordingly in the description. Under crosswise connection of the working chambers is understood in this context that the first and the third and the second and the fourth working chamber fluidly communicate with each other. This is to say that the first and the third working chamber are pressurized simultaneously when the second and the fourth working chamber are soakbed together, or vice versa.

Of course, the rotary actuator inner part, depending on its length and that of the rotary actuator outer part, more than three rotary actuator outer parts rotatably record side by side. The movement of the rotary actuator outer parts driven by the two hydraulic rotary pumps coupled to each other is also synchronized in this case by the fluidic coupling.

In preferred embodiments of the hydro-rotary oscillator according to the invention ideally lead to the hydro-rotary actuator only two hydro-connecting lines, which are alternately pressurized or sobebeaufschlagt. This can in principle also be achieved with four hydraulic connection lines leading to four main flow channels of the rotary actuator inner part. With three rotary actuator outer members provided, the two outer rotary actuator outer members are then respectively connected in common to a first pair of the main flow channels and the middle rotary actuator outer part to the two other main flow channels. Preferably The rotary actuator inner part has only two main flow channels, to which all working chambers are connected. As a result, the movement of all three Drehsteligieder-outer parts is inevitably predetermined.

In an advantageous embodiment of the invention, the working chambers of phase-shifted moving rotary actuator outer parts are in opposite directions and the working chambers of in-phase moving rotary actuator outer parts in the same direction connected to the main flow channels. Thus, the working chambers of the in-phase moving rotary actuator outer parts are fluidly connected directly parallel to each other, while the working chambers of the phase-shifted moving rotary actuator outer parts are preferably connected crosswise with the main flow channels. In this case, two hydraulic connection lines to the hydro-rotary actuator and, correspondingly, two main flow channels in the rotary actuator inner part suffice. It goes without saying that the secondary flow channels and, if appropriate, the additional transverse flow channels for the respective rotary actuator outer part are arranged offset to one another in the longitudinal direction of the hydraulic rotary actuator and, accordingly, do not stand in the way.

Preferably, the control means, which control the hydro-fluid flow to the hydro-rotary actuator and in the prior art usually formed as a standalone hydraulic valves and offset from the hydro-pump, are integrated into the hydro-rotary pump. For a safe and fast switching between the pressure and the Sogbeaufschlagung the hydraulic connection lines or the main flow channels is possible. In addition, the structure of the hydro-rotary oscillator according to the invention is simplified and less susceptible to interference. The control means may be, for example, hydro-pressure-controlled valves.

According to the invention, the hydro-fluid flow originating from the hydro-rotary pumps is oscillating. Thus, no additional control means are required to reverse the direction of the hydro-fluid flow in the hydro-connecting lines to the hydro-rotary actuator. This leads to a high reliability and cost reduction of the proposed hydro-rotary oscillator. In the cyclic oscillating hydro-fluid flow, the pressure and suction amplitudes desirably have a sinusoidal rise or fall over time. In order to There are no abrupt decelerations or accelerations of the driven by the hydro-fluid flow rotary actuator outer parts. This is particularly advantageous in the direction of rotation reversal of the respective rotary actuator outer part and thus allows high oscillation frequencies of the rotary actuator outer parts. By connecting the two hydro-rotary pumps used for the inventive hydro-rotary oscillator in parallel to each other and to the hydro-rotary actuator, the amount and pressure of the hydro-fluid flow in the hydraulic connection lines leading to the hydro-rotary actuator can be variably adjusted.

Such an oscillating hydro-fluid flow can, for example, with a from the document DE 20 2008 013 877 U1 known hydro-rotary pump having a spherical segment, filled with a hydro-fluid cavity having a circular cavity bottom plate. In the cavity, a rotationally driven ball segment is arranged, which is preferably formed as a hemisphere. The ball segment has a planar ball segment bottom and a spherical ball segment cap. The cavity bottom plate and the ball segment bottom are arranged at an angle to each other and define a spherical wedge-shaped space between the cavity bottom plate and the spherical segment bottom. The ball segment in this case has an axis of rotation which extends perpendicular to the cavity bottom plate and inclined relative to the central center axis of the ball segment and aligned with the center of the cavity bottom plate. The spherical wedge-shaped intermediate space is subdivided into two working chambers by a pendulum plate movably arranged between the cavity bottom plate and the spherical segment bottom. The pendulum plate is centered at right angles in the cavity floor plate and touches the ball segment floor with a contact edge, the pendulum plate is pivotable about a virtual pivot point in the middle of the contact edge. Both sides of the pendulum plate passageways for the hydro-fluid are provided in the cavity bottom plate. These allow the transport of the hydro-fluid from or into the working chambers of the intermediate space between the cavity bottom plate and the spherical segment bottom. The ball segment rotates at an adjustable speed in the spherical segment-shaped cavity at a distance from the cavity bottom plate, the oscillating plate is always on the spherical segment bottom over the entire length of their plant sealingly in abutment. The rotation of the ball segment causes an oscillating hydro-fluid flow in a closed hydraulic system, as formed for example by the hydro-rotary pump, the hydro-connecting lines and the hydro-rotary actuator of the hydro-oscillator according to the invention.

To adjust the hydro-fluid flow, the phase position of the rotating spherical segments of the two hydro-rotary pumps to one another, preferably between 0 ° and 180 ° can be changed. If the two ball segments are in phase, then the delivery rate and the pressure of the hydro-fluid flow in the hydro-connecting lines to the hydraulic rotary actuator are maximal; if the spherical segments are out of phase with each other by 180 °, these are minimal. In a different phase position of the spherical segments to each other, the respective value varies between the maximum and the minimum value. For two hydro-rotary pumps identical in performance, the minimum value is zero. The maximum value is limited by the rotary stops of the rotary actuator inner part and the rotary actuator outer part. Thus, the pivot angle of the at least one rotary actuator outer part relative to the rotary actuator inner part between zero degrees and the determined by the rotary stops degree value can be set. The pivoting frequency is determined only by the oscillation frequency of the hydro-fluid flow and thus by the rotational speed of the hydro-rotary pump, wherein the rotational speed of the hydro-rotary pump is freely adjustable per se to a large extent.

In this context, the two hydro-rotary pumps have a common drive unit with a drive motor and the drive axes of the ball segments of the hydro-rotary pumps are coupled together via a phase adjustment, which is suitably configured to synchronize the position of the drive axes in the opposite direction to each other. In this case, the drive shaft of the drive motor is connected via a drive chain or a drive belt with the drive axes of the ball segments. The phase adjustment device may have a self-locking drive or a locking device, so that after the adjustment of the phase position of the two spherical segments to each other an unintentional adjustment of the phase position is excluded. Of course, instead of a single adjusting element, which simultaneously acts on the two spherical segments, the phase adjusting device can also have two separate adjusting elements with which the Phase angle of the ball segments independently of each other is adjustable. The adjustment of the phase position is preferably carried out by turning the drive axis of at least one spherical segment. When set phase adjustment of the common drive of the two hydro-rotary pumps drives the two spherical segments while maintaining the selected phase offset synchronously in the same direction, the direction of rotation is arbitrary.

In an advantageous embodiment of the proposed hydro-rotary oscillator, the phase adjustment of the drive unit on four deflection points, which are arranged on the drive motor, the hydro-rotary pumps and at least one additional rotatable about an axis deflection roller, wherein in each case the drive motor and a guide roller or two Deflection rollers and the two hydro-rotary pumps are arranged opposite to each other. The phase adjustment of the drive unit has four pulleys for the drive chain or the drive belt, which guide the drive chain or the drive belt cross-shaped, wherein the four pulleys are arranged close to the hydro-rotary pumps stationary. In this case, the drive motor and the one guide roller or the two guide rollers are supported by a sliding carriage, which is guided longitudinally displaceable perpendicular to an imaginary connecting line of the two hydro-rotary pumps. The cruciform guide allows only that the circulation path of the drive chain or the drive belt to drive axes of the ball segments, the drive shaft of the drive motor and the axis of rotation of the guide roller when moving the sliding carriage in length is constant, so that is unnecessary to a complex chain tensioning device.

The hydro-rotary oscillator according to the invention, which is designed as an external rotor, has a simpler design and improved accessibility to the rotor compared to the prior art. In particular, any external devices can be particularly easily coupled to the outside of the rotor, ie with the rotary actuator outer part. In addition, there is the possibility of forming the rotatable in two directions rotational actuator outer part on its outer peripheral surface with a radially outwardly extending, forming a lever arm outer part extension to which the external device can be attached. The rotary actuator outer part can temporarily to a desired swivel angle pivotally pivoted temporarily or continuously oscillated by correspondingly controlling the hydro-fluid flow to the hydro-rotary actuator. In the first case, such a hydro-rotary oscillator can be used, for example, in a rudder system of an air or sea vehicle. Another advantage of the invention is that the hydro-rotary oscillator is formed with at least three rotary actuator outer parts, which are supported by a common rotary actuator inner part with or without a lateral distance to each other. This can be operated in phase or out of phase with a single hydro-rotary oscillator, a corresponding number of external devices. In conjunction with two suitable parallel to each other and to the hydro-rotary actuator connected hydro-rotary pumps, which have a common drive motor and are coupled via a phase adjustment of the type described above, both the pivot frequency of the at least one rotary actuator outer part, as well as its pivot angle to be controlled. Such a controlled hydro-rotary oscillator is suitable for example as a fin drive for a watercraft, when a fin is attached to the outer-part extension of the rotary actuator outer part or molded. Here, a hydraulic rotary oscillator with three rotary actuator outer parts and molded fins has been found to be particularly favorable, in which the middle of the three rotary actuator outer parts with fin always moves opposite to the two outer rotary actuator outer parts with fin. Ideally, the two outer fins in the area or size are the same, whereas the middle fin is designed to be significantly larger, ideally twice as large, ie the middle fin has an area or size, as the two outer fins together , It is useful in this case also to provide between the rotary actuator outer parts with fin partitions, so that the outgoing from one of the fins water turbulence does not affect the other fins and affect the water turbulence generated by these.

Figur 1

einen Hydro-Drehoszillator in zwei Drehstellungen (Figur 1a, 1b), mit einem stationären Drehstellglied-Innenteil, mindestens zwei hohlzylindrischen Drehstellglied-Außenteilen, einer Hydro-Rotationspumpe und einem Hydro-Drehstellglied mit zwei Arbeitskammern, in einer Querschnittdarstellung durch die Arbeitskammern eines Drehstellglied-Außenteils;

Figur 2

eine Variante des Hydro-Drehsteilglieds aus Figur 1, die vier Arbeitskammern mit unterschiedlicher Anbindung an die Hauptströmungskanäle aufweist (Figur 2a, 2b);

Figur 3

eine Ausführungsform des Hydro-Drehstellgliedes eines erfindungsgemäßen Hydro-Drehoszillators, mit einem Hydro-Drehstellglied mit einem Drehstellglied-Innenteil und drei darauf angeordneten Drehstellglied-Außenteilen in Draufsicht (Fig. 3a) und Seitenansicht (Fig. 3b), wobei keine der Drehstellglied-Außenteilen eine Flosse zeigt;

Figur 4

die Hydro-Rotationspumpe aus Figur 1, in einer vergrößerten Darstellung;

Figur 5

zwei parallel geschalteten Hydro-Rotationspumpen, mit unterschiedlichen Drehstellungen des rotierenden Kugelsegments (Figur 5a, 5b); und

Figur 6

eine Phasenverstelleinrichtung zur Einstellung des Phasenversatzes der Kugelsegmente der beiden zueinander parallel geschalteten Hydro-Rotationspumpen mit unterschiedlicher Stellung der Phasenverstelleinrichtung (Figur 6a, 6b).

The invention will be explained with reference to several examples shown in the drawing. Further features of the invention will become apparent from the following description of the figures in conjunction with the claims and the attached drawings. Show it:

FIG. 1

a hydro-rotary oscillator in two rotational positions ( FIG. 1a, 1b ), comprising a stationary rotary actuator inner part, at least two hollow cylindrical rotary actuator outer parts, a hydro-rotary pump and a hydraulic rotary actuator with two working chambers, in a cross-sectional view through the working chambers of a rotary actuator outer part;

FIG. 2

a variant of the hydro-rotary member from FIG. 1 which has four working chambers with different connection to the main flow channels ( FIG. 2a . 2 B );

FIG. 3

an embodiment of the hydro-rotary actuator of a hydro-rotary oscillator according to the invention, with a hydro-rotary actuator with a rotary actuator inner part and three arranged thereon rotary actuator outer parts in plan view ( Fig. 3a ) and side view ( Fig. 3b ), with none of the rotary actuator outer parts showing a fin;

FIG. 4

the hydro-rotary pump off FIG. 1 in an enlarged view;

FIG. 5

two parallel-connected hydro-rotary pumps, with different rotational positions of the rotating ball segment ( FIG. 5a . 5b ); and

FIG. 6

a phase adjustment device for adjusting the phase offset of the spherical segments of the two parallel-connected hydro-rotary pumps with different position of the phase adjustment ( FIG. 6a . 6b ).

The FIGS. 1a, 1b show a hydro-rotary oscillator 1, with a hydro-rotary pump 2 and a hydro-rotary actuator 3, which are connected to each other via two hydraulic connection lines 4, 4 '. The hydro-rotary actuator 3 has two working chambers 5, 5 ', which extend as an annular gap between a fully cylindrical rotary actuator inner part 6 and a hollow cylindrical rotary actuator outer part 7. The hydro-rotary actuator 3 comprises a rotary actuator inner part 6 and at least two juxtaposed rotary actuator outer parts 7, 7 ', 7 ", of which only the rotary actuator outer part 7 can be seen in the illustrated cross-sectional representation The rotary actuator outer part 7 has a radially inwardly extending co-rotating rotary actuator wall 8 and the rotary actuator inner part 6 has a transverse wall 9, 9 'on both sides of the rotary actuator wall 8. which delimit the two working chambers 5, 5 'in the circumferential direction FIGS. 1a and 1b show the hydro-rotary oscillator 1 in different rotational positions. For further description, the working chamber 5 arranged in the circumferential direction to the left of the rotary actuator wall 8 is referred to as first and the right of the rotary actuator wall 8 located as the second working chamber 5 '.

The hydro-rotary oscillator 1 generally has a closed hydraulic system. For left-hand rotation of the rotary actuator outer part 7, the first working chamber 5 is pressurized and the second working chamber 5 'simultaneously sogbeaufschlagt. The hydro-fluid flow thus flows towards the first working chamber 5 and away from the second working chamber 5 '. For clockwise rotation of the rotary actuator outer part 7 relative to the rotary actuator inner part 6, the flow direction of the hydro-fluid flow is reversed. The working chambers 5, 5 'change their size accordingly. The hydro-connecting lines 4,4 ', which connect the hydro-rotary pump 2 with the hydro-rotary actuator 3, lead to main flow channels 10, 10', which extend in the rotary actuator inner part 6 in the axial direction. From the main flow channel 10 and 10 'in each case a secondary flow channel 11 or 11' leads to the working chambers 5 or 5 '.

The hydro-rotary pump 2 has two juxtaposed separate pump chambers 12, 12 ', from which the hydraulic connection lines 4, 4' go out. In each case alternately acts one of the pump chambers 12, 12 'as a suction and the other as a pressure chamber. The exact operation of the hydro-rotary pump 2 is based on the FIG. 4 explained in more detail later. Like that FIGS. 1a, 1b can be seen, change the pump chambers 12, 12 'cyclically their size. This is based on the hydro-rotary pump 2, a hydro-fluid flow, which is oscillating. In this case, the pump chamber 12 is connected to the working chamber 5 and the pump chamber 12 'with the working chamber 5'. In the FIG. 1a the pump chamber 12 acts as a pressure chamber and the pump chamber 12 'as a suction chamber 5'. In the FIG. 1b this is the other way around.

The FIGS. 2a . 2 B show two variants of the shown in the figure Hydro rotary actuator 3. The illustrated hydro-rotary actuator 3 has in the circumferential direction next to the working chambers 5, 5 ', two further working chamber 13, 13', in the further description as a third working chamber 13 and fourth Working chamber 13 'are called. The third working chamber 13 is the first working chamber 5 and the fourth working chamber 13 'of the second working chamber 5' diametrically opposite and are each fluidly connected to each other. The hydro-rotary actuator 3 also has an outer radially extending outer part extension 14 which is integrally formed on the rotary actuator outer part 7. On the outer part extension 14, an external device 15 is attached in the form of a wing or a fin. In principle, the external device 15 may also be formed integrally with the outer part extension 14.

In the FIG. 2a the working chambers 5, 5 'and the working chambers 13, 13' are each indirectly connected to each other and via secondary flow channels 11, 11 'to the main flow channels 10, 10', wherein the secondary flow channels 11, 11 'to the working chambers thirteenth , 13 'in the axial direction of the hydraulic actuator inner part 6 at a distance from the working chambers 5, 5' leading secondary flow channels 11, 11 'are arranged. In the FIG. 2b the working chambers 5, 5 'are each connected to the main flow channels 10, 10' via secondary flow channels 11, 11 ', while the working chambers 13, 13' are connected directly to the working chambers 5, 5 'via additional transverse flow channels 16, 16'. are connected. The additional transverse flow channels 16, 16 'extend in the axial direction offset to the secondary flow channels 11, 11' and can be arranged parallel or inclined to this.

The FIGS. 3a, 3b show an embodiment of the hydro-rotary actuator 3 of a hydro-rotary oscillator according to the invention 1. The hydro-rotary actuator. 3 comprises a rotary actuator inner part 6 and three juxtaposed rotary actuator outer parts 7, 7 ', 7 ". The rotary actuator outer parts 7, 7', 7" correspond in shape to that in FIG FIG. 2 and are provided with respective outer-part extensions 14, 14 ', 14 ". Each of the three rotary-actuator outer parts 7, 7', 7" is corresponding to FIG. 3 with four working chambers 5, 5 ', 13, 13', which are connected to each other in the same way as there and the two main flow channels 10, 10 '. In this case, the two outer rotary actuator outer parts 7, '7 "move in phase and in the same direction, while the central rotary actuator outer part 7 moves out of phase opposite to the other two rotary actuator outer parts 7,'7" moves. The movement is inevitable. This is achieved in that the working chambers 5, 5 ', 13, 13' of the central rotary actuator outer part 7 in a reverse manner, that is crosswise connected to the main flow channels 10, 10 ', as in the two outer rotary actuator outer parts The two outer rotary actuator outer parts 7 ', 7 "are connected in the same way to the main flow channels 10, 10', ie connected in parallel in terms of fluid technology.

In the FIG. 4 is the hydro-rotary pump 2 off FIG. 1 shown enlarged. The hydro-rotary pump 2 is designed to generate an oscillating hydro-fluid flow and has a spherical section-shaped cavity 17 which has a circular cavity bottom plate 18 and a spherical cavity cap 19. In the cavity 17 is a rotationally driven ball segment 20 in the form of a hemisphere, with a spherical segment bottom 21 and a spherical spherical segment cap 22, respectively. The spherical segment bottom 21 and the cavity bottom plate 18 are inclined to each other and have a distance from each other. They limit a spherical wedge-shaped gap 23 on opposite sides. Thus, the ball segment 20, which is formed slightly smaller than the spherical segment-shaped cavity 17, arranged inclined in the cavity 17.

The ball segment 20 has a relative to the central center axis 24 by a few angular degrees inclined rotational axis 25 which is aligned with the center 26 of the cavity bottom plate 18 and which extends perpendicular to the cavity bottom plate 18. The inclination of the rotation axis 25 with respect to the central axis 24 is typically between 1 and 10 degrees. In the cavity bottom plate 18 is a pendulum plate 27 centrally recessed at right angles, which is held on the spherical segment bottom 21 with a contact edge 28 sealingly in abutment. The pendulum plate 27 is designed as a semi-circular disc and received in a complementary formed receiving groove 29, wherein the pendulum plate 27 is slidably guided on the semicircular circumference. The pivoting of the pendulum plate 27 about a virtual pivot point 30 takes place during rotation of the ball segment 20 through the ball segment bottom 21, which exerts pressure on one or the other half of the abutment edge 28 of the pendulum plate 27 depending on the position of the ball segment 20 in the cavity 17.

The cavity bottom plate 18 also has passageways 31, 31 'for a fluid, not shown in the drawing, which are arranged on both sides of the pendulum plate 27. The passageways 31, 31 'serve for the oscillating transport of the fluid from or into the gap 23 between the cavity bottom plate 18 and the spherical segment bottom 21, which is divided by the pendulum plate 27 into two pump chambers 12, 12'. The two pump chambers 12, 12 'act on the fluid in alternating sequence with pressure or suction when the ball segment 20 rotates in the cavity 17, wherein the two passage channels 31, 31' act alternately as inlet and outlet channels. The hydro-rotary pump 2 has a relative to the cavity 17 sealed drive shaft 32 for the ball segment 20, which is arranged in extension of the rotation axis 25 on the ball segment bottom 21 opposite side of the spherical segment cap 22. The drive axle 32 of the ball segment 20 can be coupled to a drive shaft of any motor.

The FIG. 5 shows in the FIGS. 5a . 5b in the FIGS. 1a, 1b shown hydro-rotary oscillator 1, but with two hydro-rotary pumps 2.2 '. The two hydro-rotary pumps 2, 2 'are connected in parallel to each other and to the hydro-rotary actuator 3. They have a common drive unit 33, which in the FIG. 6 is shown in plan view. The drive unit 33 has a drive motor 34, whose drive shaft 35 is connected via a drive chain or a drive belt 36 to the drive axles 32 of the ball segments 20 of the hydro-rotary pumps 2, 2 '. The drive unit 33 also includes a phase adjuster 37 for synchronizing the position of the drive axles 32 of the hydro-rotary pumps 2, 2 'to one another. The phase adjuster 37 is coupled to the drive chain or with the drive belt 36 and moves the drive axles 32 of the ball segments 20 to each other in the opposite direction of rotation.

The phase adjuster 37 has, as shown in FIG. 6 seen. In addition, four pulleys 38 for the drive chain or the drive belt 36 and an additional guide roller 39 for this, which lead the drive chain or the drive belt 36 together with the drive axles 32 of the Kegeisegmente 20 and the drive shaft 35 of the drive motor 34 in a cross shape. In each case, the drive motor 34 and the guide roller 39 and the two hydro-rotary pumps 2, 2 'are arranged opposite one another, wherein the drive motor 34 and the guide roller 39 are supported by a sliding carriage 40 which is perpendicular to an imaginary connecting line of the two hydro-rotary pumps 2, 2 'is guided longitudinally displaceable. The four guide rollers 38 are arranged in pairs each near one of the hydro-rotary pumps 2, 2 'stationary. In principle, the use of two deflection rollers 39 instead of a deflection roller 39 and the drive motor 34 as deflection points of the sliding carriage 40 allows a simpler structure of the phase adjuster 37, since no electrical connection lines must be moved during the process of the sliding carriage 40.

Alternatively, the drive motor 34 may also be arranged at a suitable other location of the drive unit 33. In this case, at the in the in the FIG. 5 formed by the drive motor 34 deflection, instead of the drive motor 34, a second guide roller 39 is arranged. This embodiment is not shown in the drawing.

The FIGS. 6a . 6b show the sliding carriage 40 of the phase adjuster 37 in two different positions. In the FIG. 6a the axes of rotation 32 of the hydro-rotary pumps 2, 2 'are equal and in the FIG. 6b mirror image aligned with each other, wherein the sliding carriage 40 is in different positions relative to the drive unit 33. In each position of the sliding carriage 40 moves the drive chain or the drive belt 36, the two axes of rotation 32 of the spherical segments 20 synchronously with each other in the same direction of rotation. When in the FIG. 6a shown alignment of the drive axles 32 is the entire hydro-fluid flow oscillating led to the hydro-rotary actuator 3, in which in the FIG. 6b As shown alignment of the fluid flow oscillates only between the two hydro-rotary pumps 2, 2 '. This means that in the first case, in the hydro-rotary actuator 3, the rotary actuator outer part 7, 7 ', 7 "pivots in the circumferential direction and not moved in the second case in an intermediate position of the sliding carriage 40 between the two in the FIGS. 6a . 6b shown positions, the hydro-fluid flow oscillates both between the hydro-rotary pumps 2, 2 'as well as between the hydro-rotary pumps 2, 2' and the hydro-rotary actuator 3. The distribution of the hydro-fluid flow from the position of the drive axles 32 and thus the spherical segments 20 of the hydro-rotary pumps 2, 2 'opposite each other.

As a result of the oscillating fluid flow, the rotary actuator outer part 7, 7 ', 7 "of the hydro-rotary actuator 3 is cyclically moved, ie oscillated back and forth, the speed of movement and thus the frequency with which the at least one rotary actuator outer part 7, 7', 7 "is dependent on the rotational speed of the drive shaft 35 of the drive motor 34. This can be set arbitrarily and is also influenced by the ratio of the drive shaft 35 to the drive axles 32 of the hydro-rotary pumps 2, 2 '.

Claims (10)

1. Hydraulic rotary oscillator (1) comprising a hydraulic rotary actuator (3) that is driven by a hydraulic fluid flow and comprises a solid cylindrical rotary actuator inner part (6) and at least one hollow cylindrical rotary actuator outer part (7), which parts are arranged so as to be mutually concentric and radially spaced, radially define at least two work chambers (5, 5') in the shape of ring segments, and are rotatable relative to one another, in a limited manner, in two directions of rotation, the work chambers (5, 5') being separated from one another by means of a co-rotating, radially extending rotary actuator wall (8), being adjustable in size, and being connected to a hydraulic rotary pump (2, 2') via hydraulic connecting lines (4, 4'), and said oscillator comprising at least one control means that guides the hydraulic fluid flow alternately to the at least two work chambers (5, 5'), the rotary actuator outer part (7) being rotatable and the rotary actuator inner part (6) being rotationally fixed, characterised in that
   the hydraulic rotary actuator (3) comprises the rotary actuator inner part (6) and three mutually adjacent rotary actuator outer parts (7, 7', 7"), the central rotary actuator outer part (7) always moving in the opposite direction from the two outer rotary actuator outer parts (7, 7"), an outer part extension (14) being formed on each of the rotary actuator outer parts (7, 7', 7") and a fin (15) being fastened to or moulded on each of the outer part extensions (14), and
   the hydraulic fluid flow that drives the hydraulic rotary actuator (3) oscillates constantly and is generated by means of two hydraulic rotary pumps (2, 2') that are continuously driven, via a common drive unit comprising a drive motor (34), the two hydraulic rotary pumps (2, 2') being fluidically connected in parallel with one another and with the hydraulic rotary actuator (3), and each hydraulic rotary pump (2, 2') comprising a cavity (17) that is in the shape of a spherical segment, is filled with a hydraulic fluid and has a circular cavity base plate (18), a rotatably driven spherical segment (20) arranged in the cavity (17) and having a planar spherical segment base (21) and a globular spherical segment top (22), a spherical wedge-shaped space (23) between the cavity base plate (18) and the spherical segment base (21), and comprising a drive axle (32) of the spherical segment (20) that extends, as an axis of rotation (25), perpendicularly to the cavity base plate (18) and so as to be inclined relative to the central axis (24) of the spherical segment (20) and is aligned with the centre (26) of the cavity base plate (18), comprising a swinging plate (27) that is introduced centrally and at right-angles into the cavity base plate and the contact edge (28) of which swinging plate touches the spherical segment base (21), which swinging plate is pivotable about a virtual fulcrum (30) of the swinging plate (27) in the centre of the contact edge (28), and comprising passage channels (31, 31') for the hydraulic fluid on either side of the swinging plate (27), in the cavity base plate (18), in order to transport the hydraulic fluid out of and into the space (23) between the cavity base plate (18) and the spherical segment base (21), and the oscillation frequency of the hydraulic fluid flow being variable by means of the freely adjustable rotational speed of the two hydraulic rotary pumps (2, 2'), and
   the quantity and pressure of the oscillating hydraulic fluid flow that drives the hydraulic rotary actuator (3) is variably adjustable, using a phase adjustment device, by means of the phase position of the rotating spherical segments (20) of the two hydraulic rotary pumps (2, 2'), the phase position of the rotating spherical segments (20) of the two hydraulic rotary pumps (2, 2') being mutually variable, preferably between 0° and 180°, and the pivot angle of the at least three rotary actuator outer parts (7, 7', 7") relative to the rotary actuator inner part (6), which angle is dependent on the phase position, being able to be variably set between zero degrees and the degree value specified by the rotary stops.
2. Hydraulic rotary oscillator according to claim 1, characterised in that the rotary actuator inner part (6) comprises two axially extending main flow channels (10, 10'), from which channels auxiliary flow channels (11, 11') extend in each case to one of the work chambers (5, 5').
3. Hydraulic rotary oscillator according to claim 2, characterised in that the work chambers (5, 5', 13, 13') are directly or indirectly connected to the main flow channels (10, 10') in opposite directions by means of rotary actuator outer parts (7, 7', 7") that move in a phase-shifted manner, and said work chambers (5, 5', 13, 13') are directly or indirectly connected to said main flow channels in the same direction by means of rotary actuator outer parts (7, 7', 7") that move in phase with one another.
4. Hydraulic rotary oscillator according to any of the preceding claims, characterised in that the hydraulic rotary actuator (3) comprises a third and fourth work chamber (13, 13') which are diametrically opposed to the first and the second work chamber (5, 5').
5. Hydraulic rotary oscillator according to claim 4, characterised in that the third and fourth work chambers (13, 13') are obliquely connected to the first and second work chambers (5, 5'), respectively, either indirectly by means of auxiliary flow channels (11, 11') leading to the main flow channels (10, 10') or directly by means of additional transverse flow channels (16, 16').
6. Hydraulic rotary oscillator according to any of the preceding claims, characterised in that the at least one control means is integrated in the hydraulic rotary pump (2, 2').
7. Hydraulic rotary oscillator according to claim 6, characterised in that a drive shaft (35) of the drive motor is connected to the drive axles (32) of the spherical segments (20) by means of a drive chain or a drive belt (36), and in that the drive axles (32) of the spherical segments (20) of the hydraulic rotary pumps (2, 2') are coupled together by means of the phase adjustment device (37), the position of the drive axles (32) relative to one another in opposite directions of rotation being adjustable, preferably synchronously.
8. Hydraulic rotary oscillator according to claim 7, characterised in that the phase adjustment device comprises four guide rolls (38) for the drive chain or the drive belt (36) and at least one additional guide roller (39) which guide the drive chain or the drive belt (36) in a crossed manner, in each case the drive motor (34) and one guide roller (39) or two guide rollers (39) and the two hydraulic rotary pumps (2, 2') being arranged opposite one another, and the drive motor (34) and the guide roller (39) or the two guide rollers (39) being supported by a sliding carriage (40) that is guided so as to be longitudinally displaceable perpendicularly with respect to an imaginary connecting line between the two hydraulic rotary pumps (2, 2'), and the four guide rolls (38) being fixed close to the hydraulic rotary pumps (2, 2').
9. Hydraulic rotary oscillator according to any of the preceding claims, characterised in that the size and/or surface area of the fins (15) that move in mutually opposite directions in each case is the same.
10. Hydraulic rotary oscillator according to any of the preceding claims, characterised in that dividing walls are arranged between the fins (15) of the rotary actuator outer parts (7, 7', 7").

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