PL236310B1 - Rotary vane hydraulic element - Google Patents

Abstract

The subject of the invention is a rotary-vane hydraulic element, the body of which, having an internal hydraulic space in the shape of a toroidal solid (toroidal) with an axis of rotation (X - X), is divided by a plane (A - A) passing through this space perpendicularly to the axis of rotation (X - X), and in the case of a space in the shape of a circular toroid (torus) - by a plane (A - A) passing through the center of the circle describing this space into a moving part (1.1) (rotor) and a stationary part (1.2) (stator). Both body parts are joined by two rings (1.7a and 1.7b), attached concentrically on both sides of the hydraulic space to the edges of one body part and radially overlapping the other part, forming with both body parts two concentric slewing bearings, maintaining the rotor and stator in one axial-radial position relative to each other and enabling the rotor to rotate relative to the stator around a common axis of rotation (X - X). The internal space contains vanes (1.11a and 1.11b) with a cross-section of this space, attached alternately to the rotor and stator, dividing this space into separate hydraulic chambers. Thanks to the ability of the rotor to rotate relative to the stator, together with the attached vanes, the claimed invention can be used, for example, as a rotary actuator, various types of valve, pump, or other functional element.

Description

Description of the invention

The invention relates to a rotary vane hydraulic element for use mainly in hydraulic systems as a rotary actuator, various types of valve, displacement pump or yet another functional element, when the movable part of the rotor body of a given element is to perform a rotationally reciprocating movement with a limited rotation angle relative to the fixed part. body in the form of a stator.

From TW436579, a rotary-reciprocating engine is known having an internal toroidal space in which the pistons attached via piston rods and intermediate parts to the rotor move. In this invention, the toroidal space is formed by a stator composed of several parts attached to each other and stationary against each other.

DE19523736 discloses a rotary-reciprocating engine having an internal toroidal space in which the pistons, which are attached to the rotor via piston rods and intermediate parts, move. In this invention, the toroidal space is formed by cylinders composed of several parts attached to each other and stationary against each other.

From US5823092 there is known a rotary-reciprocating actuator in which the stator and the rotor together define an internal toroidal space containing a blade attached to the rotor. In this invention, the division between the rotor and the stator is made by a cylindrical surface with an axis of rotation coinciding with the axis of rotation of the actuator rotor.

The prior art is shown in Figures 6 and 7 and described below. Known rotary vane hydraulic actuators have a body (housing) consisting of a base, a cylindrical body, a cover and a rotary hub. These parts delimit an internal hydraulic space defined as a rectangular toroid, that is, a solid formed by the rotation of the rectangle about the axis of rotation X-X, lying in the plane of the rectangle and not intersecting it. The cylindrical body, also known as the stator, together with the base and cover form the outer part of the actuator body, which is mostly a stationary part with no movement. The rotating hub forms the internal part of the actuator body, also called the rotor, because in most cases it is a movable part that performs a rotary-reciprocal motion. In the construction of this actuator, it is important that the body is divided into a movable part (rotor) and a stationary part (stator) by a cylindrical surface passing through the body parallel to the axis of rotation X-X. The base, in most designs, is made in one piece with a cylindrical body. The rotating hub (rotor) is seated directly on the shaft on a conical keyed connection and secured with a nut to transmit torque and rotational movement to the shaft. The next components of the discussed actuator are movable blades and fixed blades with a cross-section of an internal hydraulic space, attached alternately to the rotating hub (rotor) and cylindrical body (stator), respectively. In most designs, fixed blades are attached to a cylindrical body (stator) with screws. The movable vanes can also be bolted on or made in one piece with a rotating hub (rotor), as is also the case in this example. The number of paddles can vary from one to several. In the discussed solution, two movable blades and two fixed blades are installed alternately, dividing the internal hydraulic space into four hydraulic chambers. The cover is attached to the cylindrical body (stator) with screws. The base is attached to the foundation with screws. Between the hub (rotor) and the cover and the base are respectively the upper radial bearing, the lower radial bearing, and the axial bearing, also called the thrust bearing. The vanes are fitted with gaskets to seal the hydraulic chambers between the vanes. Between the cover and the rotating hub (rotor), and between the base and the shaft, there are seals for the hydraulic space, respectively: upper and lower, used to seal the entire hydraulic space from the environment. Forcing hydraulic oil or another medium with a pump through the distributor, and then through conduits to the appropriate hydraulic chambers, causes the rotational movement of the movable blades together with the rotary hub (rotor) and the shaft attached to it around the XX rotation axis, while the base, cylindrical body (stator) and the cover remains stationary. With the manifold position shown, the pump will pump the medium through the conduit to the indicated hydraulic chambers, which will cause the rotation of the movable vanes and the rotating hub (rotor) with the shaft attached to it, clockwise relative to the stator. On the other hand, from opposite hydraulic chambers the medium will be pumped with movable blades through the conduit and the distributor to the tank. A rotary vane hydraulic actuator as described above is used, for example, for butterfly valves and in steering machines.

PL 236 310 B1

The invention relates to a rotary vane hydraulic element having a body divided into a movable rotor part and a stationary stator part which together delimit a toroidal internal hydraulic space with a rotation axis X-X. The rotor rotates about the same X-X axis of rotation with respect to the stator attached to the foundation. The vanes inside the body are attached to the rotor and stator respectively.

According to the invention, the body of the element is divided by a plane AA passing through the internal hydraulic space perpendicular to the axis of rotation XX, and in the case of a toroid-shaped space (torus) - by a plane AA passing through this space perpendicular to the axis of rotation XX and by the center of the circle describing this space, a movable part in the form of a rotor and a stationary part in the form of a stator. These parts are connected by two rings, concentrically attached on both sides of the hydraulic space to the edges of one body part and overlapping radially with the other body part, forming two concentric slewing bearings with both parts. This connection keeps the rotor and stator in one axial radial position with respect to each other and allows the rotor to rotate with respect to the stator about a common X-X rotation axis. Due to such division of the body, the internal hydraulic space can have the shape of a circular toroid, i.e. a torus, and blades with a circular cross-section can be used, which are more optimal compared to blades with a rectangular cross-section. Due to the above-mentioned advantages, the claimed hydraulic rotary vane element with circular blades, used e.g. as a rotary actuator, can withstand higher pressure and achieve better performance, e.g. higher torque than when the element with rectangular blades is used.

The invention is illustrated by examples and the drawing, which shows the following figures and parts:

Figure 1: General scheme of the invention in plan view - section B-B.

Figure 2: General diagram of the invention in elevation - section A-A with a diagram of the hydraulic system.

Figure 3: Diagram of the claimed invention, in which both body parts: the lower (stator) and upper (rotor) have one protruding side edge, position 2.1 a and 2.1b.

Figure 4: Diagram of the claimed invention, in which the side edges are part of the abutment rings, item 2.2a and 2.2b.

Figure 5: Diagram of the claimed invention with an internal toroidal hydraulic space with a rectangular cross section, item 2.3.

Figure 8 and 9: Schematic view of the application of the present invention as a shut-off valve.

Figure 10 to 15: A diagram of the application of the present invention as a three-position three-way hydraulic distributor.

Figure from 16 to 21: Diagram of the application of the present invention as a four-way three position hydraulic distributor.

Figure 22 to 25: Schematic application of the claimed invention as a safety valve. Figure 26: Diagram of the application of the present invention as a rotary displacement pump. Fig. 6 and 7: Prior art (Fig. 6: Plan view - F-F section, Fig. 7: Elevation view - E-E section).

Part designation:

1.1 Upper (movable) part of the rotary vane hydraulic element body (rotor)

1.2 Lower (stationary) part of the rotary vane hydraulic element body (stator)

1.3 Foundation

1.4 Bolts securing the lower part 1.2 (stator) to the foundation 1.3

1.5 a Outside side edge

1.5 b Inner side edge

1.6 a Radial outer bearing

16b Inner radial bearing

1.7 a Outer thrust ring

1.7 b Inner thrust ring

1.8 Bolts fastening thrust rings to the side edges

19a Lower outer axial bearing

1.9b Lower inner axial bearing

1.10 a Upper outer axial bearing

1.10 b Upper inner axial bearing

PL 236 310 B1

1.11 a Moving vanes (rotor blades)

1.11b Fixed blades (stator blades)

1.12 Bolts securing the blades to the body part

1.13 a, b, c, d Hydraulic chambers between the blades

1.14 a, b Refrigerant supply lines

1.15 Vane seals

1.16 a Outer hydraulic space seal

1.16 b Internal hydraulic space seal

1.17 Pump

1.18 Manifold

1.19 Refrigerant tank

1.20 Slide-swing joint (yoke)

1.21 Bolts securing the connection 1.20 to the rotor (1.1)

1.22 Tiller

1.23 Hub

1.24 Shaft

1.25 Nut for fastening the hub 1.23 to the shaft 1.24

Part designation in Figures 6 and 7: State of the art:

3.1 Basis

3.2 Cylindrical body (stator)

3.3 Cover

3.4 Rotary hub (rotor)

3.5 Shaft

3.6 Nut fastening the hub 3.4 (rotor) to the shaft 3.5

3.7 Movable vanes (rotor blades)

3.8 Fixed blades (stator blades)

3.9 Screws fastening fixed blades 3.8 to the body 3.2

3.10 a, b, c, d Hydraulic chambers between the blades

3.11 Screws securing the cover 3.3 to the body 3.2

3.12 Foundation

3.13 Bolts securing the base 3.1 to the foundation 3.12

3.14 a Top radial bearing

3.14 b Bottom radial bearing

3.15 Axial (thrust) bearing

3.16 Blade seals

3.17 a Upper hydraulic space seal

3.17 b Bottom hydraulic space seal

3.18 Pump

3.19 Manifold

3.20 a, b Refrigerant supply lines

3.21 Refrigerant tank

General example (fig. 1 and 2)

The body of the proposed invention, having a toroidal (toroidal) internal hydraulic space with an XX rotation axis, is divided by a plane AA passing through this space perpendicular to the XX rotation axis, and in the case of a circular toroid shaped hydraulic space by a plane AA passing through through this space perpendicular to the axis of rotation XX and through the center of the circle describing this space, onto the movable part 1.1 (rotor) and stationary part 1.2 (stator), which are joined by two rings 1.7a and 1.7b attached concentrically on both sides of the hydraulic space to the edge of one parts and overlapping radially over the other part, forming with both body parts two concentric slewing bearings, holding both parts in one axially radial position and allowing both parts to pivot relative to each other about a common XX rotation axis.

PL 236 310 B1

Due to the division of the body by the plane A-A, passing through the internal hydraulic space perpendicular to the axis of rotation X-X, the body of the hydraulic element is obtained, consisting of parts, which we will refer to hereinafter: the upper part of the body 1.1 and the lower part of the body 1.2. In the discussed solution, the upper part of the body 1.1 can be called a rotor, because it is the part of the body that performs a rotational movement, and the lower part of the body 1.2 can be called a stator, because it is a stationary part of the element fixed to the foundation 1.3 by bolts 1.4 and does not make any movement.

One of the parts of the body, in the discussed solution is the upper part of the body 1.1 (rotor), has two cylindrical side edges protruding beyond the division plane AA concentrically on both sides of the hydraulic space: outer 1.5a and inner 1.5b, which overlap along the axis XX (axially) for the lower part of the body 1.2. The claimed element may be so designed that both body parts will have one protruding side edge axially overlapping the other body part, as shown in Fig. 3 in Fig. 2, item 2.1a and 2.1b. Both side edges 1.5a and 1.5b together with the lower part of the body 1.2 (stator) form two radial bearings: outer 1.6a and inner 1.6b.

The next important parts are two support rings: outer 1.7a and inner 1.7b, fixed by screws 1.8 to the protruding side edges 1.5a and 1.5b. The back-up rings 1.7a and 1.7b, concentrically attached to one body part, extend radially over the other body part, so that one body part embraces the other and keeps the two body parts the same distance from each other along the X-X rotation axis. The claimed element can be designed such that the abutment rings will be made with cylindrical side edges, as shown in Fig. 4 in Fig. 2, item 2.2a and 2.2b. The thrust rings together with the lower part of the body 1.2 (stator) form two lower axial bearings: outer 1.9a and inner 1.9b, which bear loads from the axial forces pushing back both parts of the body, resulting from the pressure inside the element, and allow the rotor to rotate in relation to the stator around the axis turnover XX.

Between the upper part of the body 1.1 (rotor) and the lower part of the body 1.2 (stator), in the parting plane AA, there are two upper axial bearings: external 1.10 and internal 1.10b, which also carry loads from axial forces occurring between both parts of the body, but opposite to the loads transmitted by bearings 1.9a and 1.9b.

The side edges 1.5a and 1.5b together with the thrust rings 1.7a and 1.7b attached thereto form with both body parts on both sides of the hydraulic space two concentric slewing bearings: one outer and one inner, each consisting of one radial bearing, 1.6a respectively, 1.6b, and two axle bearings 1.9a, 1.9b and 1.10a, 1.10b respectively. Both slewing rings keep the two parts of the body in one axial-radial position and allow them to move relative to each other only in a rotational motion about a common axis of rotation X-X.

Both parts of the body delimit the internal toroidal hydraulic space, i.e. the space formed by the rotation of a plane figure, circle or rectangle around the X-X axis lying in the B-B plane of this figure and not intersecting it. In the solution discussed in Figures 1, 3 and 4, the inner space is defined by the rotation of the wheel about the X-X axis, i.e. it forms a circular toroid (torus). However, the inner space can also be defined by the rotation of the rectangle, and this will then form a path o and d rectangular as shown in Fig. 5 in Fig. 2, item 2.3.

In the inner toroidal space there are movable blades 1.11 a (rotor) and fixed blades 1.11b (stator) with a cross-section of this space, fixed by screws 1.12, alternately to the upper part of the body 1.1 (rotor) and the lower part of the body 1.2 ( stator). The number of paddles can vary from one to several. In the solution discussed in Fig. 2, two blades alternately, i.e. four blades in total, are attached to each body part, dividing the internal hydraulic space into four separate hydraulic chambers, designated 1.13a, 1.13b, 1.13c, 1.13d, respectively. Opposite hydraulic chambers: 1.13a and 1.13c as well as 1.13b and 1.13d are connected by pipelines 1.14a and 1.14b respectively. The vanes are equipped with 1.15 gaskets to seal the hydraulic chambers between the vanes. Between the thrust rings 1.7a and 1.7b and the lower part of the body 1.2 (stator) there are hydraulic space seals, respectively: external 1.16a and internal 1.16b, sealing the entire hydraulic space from the environment.

Due to the possibility of one body part pivoting relative to the other body part, and the resulting variable position of the blades attached thereto, the present invention

The PL 236 310 B1 can be used, for example, as a rotary actuator, various types of valve, pump or yet another functional element. Some application examples are given later in the description.

Examples of the application of the invention

Rotary vane hydraulic cylinder (Figs. 1 and 2)

Forcing the medium by pump 1.17 through the distributor 1.18 and then through supply lines 1.14a or 1.14b to the appropriate hydraulic chambers 1.13a 1.13c or 1.13b and 1.13d causes the rotational movement of the movable blades 1.11a together with the upper part of the body 1.1 (rotor) around the XX axis in relation to the lower body parts 1.2 (stator). At the position of the distributor 1.18, shown in the figure, the pump will force the medium through the line 1.14a to the hydraulic chambers 1.13a and 1.13c, which will cause the upper part of the body 1.1 (rotor) to rotate clockwise around the axis X-X. From the hydraulic chambers 1.13b and 1.13d, the medium, pumped with movable blades, will flow through the conduit 1.14b and then through the distributor 1.18 to the tank 1.19. The rotation of the upper part of the body 1.1 (rotor) can then be transferred to other devices. In the diagram discussed in Fig. 1, the rotational movement of the upper part of the body 1.1 (rotor) is transmitted through a slide-oscillating connection 1.20 (yoke), fixed to the rotor by screws 1.21, to a tiller 1.22 mounted in it with one end. The other end of the tiller 1.22 is fixed to the hub 1.23 which is mounted on the shaft 1.24 and secured with a nut 1.25. Consequently, the rotation of the rotor 1.1 causes the rotation of the shaft 1.24, located on the axis of rotation of this actuator. A rotary vane hydraulic element used as a rotary actuator as described above can be used, for example, to close / open butterfly valves and operate the stem in steering gears.

Valve

The present invention can also be used as various types of valve for controlling the direction and / or flow rate of the medium. In this case, the blades attached to one body part and sliding relative to the other body part will serve to open and close feed line openings made in the corresponding part of the body, and the hydraulic chambers between the blades will serve to connect the individual lines.

Shut-off valve (fig. 8 and 9)

Figures 8 and 9 show a diagram of the claimed invention applied as a shut-off valve item 4.1. The diagram shows a cross-section through the toroidal hydraulic space of the element, which shows: one movable vane 4.2 attached to the rotor (not shown in the drawing), the lower surface of the hydraulic space in the stator, in which two feeder pipe openings are made: 4.3a and 4.3b. In the case shown in Fig. 8, the rotor is in a central position in which, by means of a movable vane 4.2, it closes the opening in the stator of the feed conduit 4.3a and thus cuts off the flow of medium through the element. If the rotor of the element in question is pivoted from the central position shown in Fig. 8 to either side with the movable blade 4.2 attached thereto, but so as not to cover the opening of the conduit 4.3b, to the position shown in Fig. 9, then the opening in the stator of the supply line 4.3a will open and the lines 4.3a 4.3b will be connected through the hydraulic chamber inside the element, which will allow the medium to flow through the element.

Three-position three-way valve (fig. 10-15)

Figures from 10 to 15 show a diagram of the proposed invention used as a three-position three-way distributor - item 4.10. The figure shows a cross-section through the toroidal hydraulic space of the element, which shows: one movable blade attached to the rotor (not shown in the diagram), one fixed blade 4.12 attached to the stator and the lower surface of the hydraulic space in the stator, in which three conduit openings are made leading 4.13a, 4.13b, 4.13c. In the case shown in Fig. 10, the rotor is in a central position in which, by means of a movable vane 4.11, it closes the opening in the stator of the supply line 4.13a and thus cuts off the flow of medium through the element. This position of the element 4.10 corresponds to the position symbol of the distributor 4.14a shown in Fig. 11. If the rotor of the element in question is rotated from its central position clockwise, together with the movable vane 4.11 attached thereto, to the position shown in Fig. 12, then then the hole in the stator of the supply line 4.13a will be opened and the lines 4.13az 4.13b will be connected through the chamber 4.15a. This position of element 4.10 corresponds to the position symbol of the distributor 4.14b shown in Fig. 13. If the rotor is turned from its center position in the opposite direction

When clockwise together with the movable vane 4.11, to the position shown in Fig. 14, the hole in the stator of the feed line 4.13a will be opened and the lines 4.13a and 4.13c will be connected via the chamber 4.15b. In this position the hydraulic element 4.10 corresponds to the position of the distributor 4.14c shown in Fig. 15.

Three-position four-way valve (fig. 16-21)

Figures from 16 to 21 show a diagram of the proposed invention used as a three-position four-way distributor - item 5.1. The figure shows a cross-section through the toroidal hydraulic space of element 5.1, showing: two movable blades: 5.2a and 5.2b, attached to the rotor (not shown in the diagram), two stationary blades: 5.3a and 5.3b, attached to the stator, and the lower one the area of the hydraulic space in the stator with six holes for the supply lines 5.4a, 5.4b, 5.4c, 5.4d. In the case shown in Fig. 16, the rotor is in the middle position, in which, by means of movable blades 5.2a and 5.2b, it closes the holes in the stator of the supply lines 5.4a and the outlet lines 5.4b, respectively, and thus cuts off the flow of medium from the pump 5.5 to the actuator 5.6 and fluid outflow from the actuator 5.6 to the tank 5.7. This position of the element 5.1 corresponds to the symbol of the position of the distributor 5.8a shown in Fig. 17. In this position of the distributor, the actuator remains stationary. If the rotor of the element in question is rotated from the central position shown in Fig. 16 clockwise with the movable blades 5.2a and 5.2b attached thereto to the position shown in Fig. 18, then the openings in the stator of the supply lines 5.4. a and drain 5.4b will be opened and lines 5.4az 5.4c will be connected through chamber 5.9a and lines 5.4bz 5.4d through chamber 5.9b. Then the pump 5.5 will feed through the conduit 5.4a, the chamber 5.9a and through the conduit 5.4c the lower chamber of the actuator 5.6, which will cause the piston to move upwards. The upward movement of the piston will cause the medium to be pumped from the upper cylinder chamber 5.6 through conduit 5.4d, chamber 5.9b, and then through conduit 5.4b to the tank 5.7. In this position, the hydraulic element 5.1 will correspond to the position symbol of the distributor 5.8b shown in Fig. 19. If the rotor is turned counterclockwise from the center position shown in Fig. 16, together with the movable blades 5.2a and 5.2b, to the position shown in Fig. 20, then the holes in the stator of the supply lines 5.4a and the discharge lines 5.4b will be opened and connection will be made, but this time lines 5.4a 5.4d through the chamber 5.9c and lines 5.4bz 5.4c through the chamber 5.9d. Then the pump 5.5 will feed through the conduit 5.4a, the chamber 5.9c and via the conduit 5.4d the upper chamber of the actuator 5.6, which will cause the piston to move downwards. The downward movement of the piston will cause the refrigerant to be pumped from the lower cylinder chamber through conduit 5.4c, chamber 5.9d, and then through conduit 5.4b to the tank 5.7. In this position, the hydraulic element 5.1 corresponds to the position symbol of the distributor 5.8c, shown in Fig. 21.

Safety valve (fig. 22-25)

Figures from 22 to 25 show a diagram of the claimed invention applied as a safety valve - item 6.1. The figure shows a cross-section through the toroidal hydraulic space of a given element 6.1, which shows: one movable blade 6.2 attached to the rotor (not shown in the diagram), one fixed blade 6.3 attached to the stator, lower surface of the hydraulic space in the stator, in which they are made two holes for pipes: supply 6.4 and drain 6.4b. Inside the element there is a spring 6.5, placed in the chamber 6.6a between the movable blade 6.2 and the fixed blade 6.3. In the case shown in Fig. 22, the pressure in the supply line 6.4a is below the allowable, determined by the tension of the spring 6.5, and the movable blade 6.2 is in a central position, closing the opening of the discharge line 6.4b. This position of element 6.1 corresponds to the symbol of the safety valve 6.7a shown in Fig. 23. If the pressure in the supply line 6.4a rises above the allowable tension determined by the spring 6.5 as shown in Fig. 24, the pressure in the chamber 6.6b will also increase. This will put pressure on the vanes and deflect the rotor with the movable blade 6.2 clockwise from the center position and open the outlet conduit stator hole 6.4b. As a result, medium will flow from line 6.4a, through chamber 6.6b, line 6.4b to tank 6.8 and reduce the pressure in line 6.4a. This position of element 6.1 corresponds to the symbol of the safety valve 6.7b shown in Fig. 25.

Displacement Pump (Fig. 26)

The present invention can also be used as a rotary displacement pump, which is schematically shown in Fig. 26. The diagram shows a cross-section through the toroidal hydraulic space of element 6.10, which shows: two movable blades 6.11a and 6.11b, attached to the rotor (not visible in the picture), two fixed blades 6.12a and 6.12b,

Attached to the stator, and the lower surface of the hydraulic space in the stator, in which the openings of the feed lines 6.13a and discharge 6.13b are made. One-way valves 6.14 are installed in the supply and discharge conduits and inside the movable blades, which allow the medium to flow in one direction only: from the tank 6.15 to the tank 6.16. If we use an external drive and put the rotor in a reciprocating motion together with the blades that are movable in relation to the fixed blades, then in the case of clockwise rotation, the medium will be sucked from the tank 6.15 through the line 6.13a to the chamber 6.17a, and from the chamber 6.17b will be pumped through the line 6.13b to the tank 6.16. From chamber 6.17c, the medium will flow through a non-return valve inside vane 6.11a into chamber 6.17d. When the rotor turns counterclockwise, the processes in the chambers will change: the medium will be sucked from the tank 6.15 to the chamber 6.17c and will be pumped from the chamber 6.17d to the tank 6.16. From chamber 6.17a, the medium will flow through a non-return valve inside vane 6.11b to chamber 6.17b.

Claims (1)

Patent claim 1. A rotary vane hydraulic element having a body divided into a movable part in the form of a rotor and a stationary part in the form of a stator, which together delimit an internal hydraulic space in the shape of a toroidal body with a rotation axis (XX), and in which the rotor rotates about this the same axis of rotation (XX) towards the stator attached to the foundation, and in which the blades located in the internal hydraulic space are attached to the rotor and the stator, respectively, characterized in that its body is divided by a plane (AA) passing through this space perpendicular to the axis rotation (XX), and in the case of a space in the shape of a circular toroid (torus) - a plane (AA) passing through this space perpendicular to the axis of rotation (XX) and through the center of the circle describing this space, to the movable part (1.1) in the form of the rotor and the part stationary (1.2) in the form of a stator, which are connected by two rings (1.7a) and (1.7b), concentrically attached on both sides of the hydraulic space to the edge of one body part and overlapping radially with the road part of the body, forming with both parts two concentric slewing bearings, holding the rotor and stator in one axially radial position with respect to each other and allowing the rotor to rotate relative to the stator around a common axis of rotation (XX) .