Fluid dispenser with improved operation

Abstract

The present invention relates to an improved operation fluid dispenser, in particular to a rotary fluid dispenser. The fluid dispenser comprises a valve body having an inlet port and two outlet ports, a core capable of allowing or interrupting the flow of fluid between the inlet port and the outlet ports, said core being rotatably movable about a longitudinal axis and configured to have two end angular positions, a gear motor comprising: an output shaft rod driving the core; a sensor (17) for managing the electric motor, mounted to a facing first electronic board (PCB1); an angular position sensor (58) of the output shaft rod, mounted to a second electronic board (PCB2), the first electronic board (PCB1) and the second electronic board (PCB2) being disposed in two different planes orthogonal to the longitudinal axis (X), a magnet (58) being rotatably attached to the output shaft rod, the position and the angular extension of the magnet being such that the magnet does not interfere with the operation of the management sensor (17).

Description

TECHNICAL FIELD

[0001] The present invention relates to a fluid dispenser driven by a gear motor with improved operation. BACKGROUND

[0002] In the automotive industry, fluid dispensers, also called valves, are used, driven open / close or proportionally by a gear motor. These valves are used, for example, to manage the supply of coolant, fuel, oil, etc.

[0003] The gear motor can comprise a rotor with magnets housed in a stator with coils. A gear reducer is housed in the rotor. An output shaft is coaxial with the rotor. Such a gear motor is described in document WO2019 / 129984.

[0004] This gear motor has a reduced overall size, making it suitable for driving valves, such as hydraulic dispensers in automobiles. Furthermore, this gear motor implements a centering shaft which ensures the guiding, repositioning of all the moving elements and also provides the function of a plain bearing for the moving elements. The wear of the gear reducer is limited.

[0005] The gear motor comprises sensors for the management of the motor and at least one angular position sensor of the mounted output shaft, these sensors being mounted to an electronic board. The motor management sensors and the position sensor are sensitive to a magnetic field, for example Hall effect sensors.

[0006] The motor management sensors are sensitive to the multipole magnets of the motor and the position sensor is sensitive to a magnet rotatably fixed to the output shaft.

[0007] However, it has been noted that the position magnet interferes with the operation of the motor management sensors and the motor magnet interferes with the operation of the position sensor. SUMMARY

[0008] It is therefore an object of the present invention to provide a fluid dispenser driven by a gear motor with improved operation.

[0009] The above object is achieved by a fluid dispenser comprising a valve body having a core and a gear motor comprising a stator, a rotor, a gear reducer and an output shaft, the core being rotatably fixed to the output shaft. Motor management sensors are mounted to a first electronic board and at least one output shaft position sensor is mounted to a second electronic board axially distant from the first electronic board. A magnet is rotatably fixedly mounted on the output shaft, the rotational movement of the magnet being detected by the position sensor. The position of the position sensor relative to the output shaft and the angular extension of the magnet are such that the magnetic field of the magnet has little or no effect on the management sensors.

[0010] On the one hand, the disturbance of the position sensor by the motor magnet is reduced by moving the position sensor axially away from the management sensor, on the other hand, the disturbance of the position magnet by the management sensor is reduced by angularly offsetting the position magnet away from the management sensor.

[0011] The operation of the distributor is thus improved.

[0012] Advantageously, the first electronic board is located inside the housing of the gear motor, while the second board is located outside the housing.

[0013] Advantageously, the position magnet has an angular extension such that the magnet never forms a vertical line with one of the management sensors.

[0014] The subject of the application is thus a rotary fluid distributor comprising: a valve body having at least one fluid inlet port and a fluid outlet port; a core able to allow or interrupt the flow of fluid between the inlet port and the outlet port, said core being rotatable about a longitudinal axis and being configured to have two end angular positions; a gear motor comprising a gear reducer, a brushless electric motor and an output shaft having a longitudinal axis, the core being rotatably fixed to said output shaft, sensors for managing the electric motor being mounted to a first electronic board and facing the side of the rotor of the gear motor, at least one angular position sensor for detecting the angular position of the output shaft being mounted to a second electronic board, the first electronic board and the second electronic board being arranged in two different planes orthogonal to the longitudinal axis, a permanent magnet being rotatably fixedly mounted to the output shaft and being arranged to be detected by the angular position sensor. Said permanent magnet has a circular arc shape, the position and the angular extension of the permanent magnet being such that, whatever the angular position of the output shaft places the core in any position between the end angular positions of the core, considering the projection of said magnet and the projection of the management sensors on the same plane orthogonal to the longitudinal axis, the projection of the permanent magnet does not face the projection of the management sensors in the radial direction.

[0015] In a preferred example, the gear motor comprises a housing which houses the motor and the gear reducer, wherein the first electronic board is housed inside the housing, while the second electronic board is arranged outside the housing and between the housing and the valve body.

[0016] Advantageously, the permanent magnet is a diametrically magnetized magnet.

[0017] In an exemplary embodiment, the valve body comprises two outlet ports, one of the end angular positions at least mainly corresponding to the flow between one of these outlet ports and the inlet port, the other end angular position at least mainly corresponding to the flow between one of these outlet ports and the inlet port.

[0018] Advantageously, the rotary fluid dispenser comprises an orientation device for orienting the permanent magnet with respect to the output shaft rod so as to position the north and south poles of the magnet in a given orientation with respect to the output shaft rod.

[0019] The orientation device comprises for example a counter-sinking plane formed in the magnet and cooperating with a flat member carried by the output shaft rod, and a protruding member carried by the output shaft rod or the permanent magnet and cooperating with a recessed element carried correspondingly by the permanent magnet or the output shaft rod.

[0020] The permanent magnet is preferably glued to the output shaft rod.

[0021] The motor can comprise a coil attached to and electrically connected to the first electronic board.

[0022] Advantageously, the gear motor comprises three or a multiple of three coils.

[0023] Preferably, the gear reducer is at least partially housed in the rotor.

[0024] The gear reducer is advantageously a planetary gear reducer, the gear motor comprising a single shaft forming the rotation axis of the rotor and the shaft of the planetary gear reducer. BRIEF DESCRIPTION OF DRAWINGS

[0025] The application will be better understood on the basis of the following description and the attached drawings, in which:

[0026] Figure 1 is a longitudinal sectional view of an example of a hydraulic dispenser according to the application.

[0027] Figure 2 is Figure 1 is a perspective view of the gear motor of

[0028] Figure 3A is a top view of an example of a magnet of a position sensor.

[0029] Figure 3B is a perspective view of the magnet of Figure 3A

[0030] Figure 3C is a side view showing the relative position of the position magnet and the position sensor.

[0031] Figure 3D is a perspective view of the output shaft rod and the position magnet.

[0032] Figure 4A is a bottom view of the gear motor of Figure 2

[0033] ​​Figure 4B is a bottom view of a gear motor similar to Figure 4A , with the position magnet in a second position on the output shaft rod.

[0034] Figure 4C is a bottom view of a gear motor similar to Figure 4A , with the position magnet in a third position on the output shaft rod.

[0035] Figure 5 is a graph of the magnetic field B (mT) observed by the position sensor as a function of the angle β (°) between the position sensor and the magnet.

[0036] Figure 6 is a graph of the voltage E (V) emitted by the position sensor as a function of the angle β (°) between the position sensor and the magnet. DETAILED DESCRIPTION

[0037] In Figure 1 , an exemplary hydraulic distributor DH driven by a gear motor MR according to the application can be seen in longitudinal section view. In Figure 2 , the gear motor can be seen alone.

[0038] The distributor DH comprises a valve body B having a substantially cylindrical revolution shape about an axis X, and a core N mounted in the valve body B and rotatable in the valve body B.

[0039] In the example shown, the valve body B comprises a bottom F and a cylindrical side wall P as a single piece, and a valve cover C for closing the valve body. The valve cover C is fixed to the valve body B, for example by welding, for example by ultrasonic welding.

[0040] The valve body B comprises a supply port (not visible) formed in the side wall P and extending to a conduit for connection to a source of liquid, and at least two outlet ports O also formed in the side wall P, each outlet port O extending to a conduit T for supplying liquid to a given area, for example an area to be cooled. The valve body B defines a hydraulic chamber.

[0041] The inlet and outlet ports are distributed around the axis X on the wall.

[0042] The core N is mounted inside the hydraulic chamber and engages with the output shaft rod A of the gear motor A.

[0043] The gear motor extends along a longitudinal axis X. It comprises a housing 2 in which an electric motor M and a planetary gear reducer R are housed. The housing 2 protects the motor and the gear reducer from the outside environment. The longitudinal end of the output shaft rod A, which engages with the core, protrudes from the housing 2 through an opening 3.

[0044] In the following description, the longitudinal end of the gear motor comprising the output shaft A will be called "downstream end" and the other longitudinal end of the gear motor will be called "upstream end". The orientation of the various components of the gear motor with respect to these ends can be called "upstream" or "downstream".

[0045] The housing 2 comprises a casing 4 and a lid 5 closing the casing.

[0046] The electric motor is a brushless motor and comprises a stator 8 and a rotor 10 disposed in the stator 8.

[0047] The stator 8 is for example made of a stack of magnetic steel sheets, for example M270-35A steel. Other steels can also be used in a non-limiting manner, for example M235-35A, M250-35A and M330-35A.

[0048] For example, the stator is composed of 28 sheets, each sheet having a thickness of 0.35 mm. The total thickness of the stator is 9.8 mm.

[0049] The stator comprises an accommodation for accommodating the rotor 10; the accommodation extends through the entire thickness of the stator 8.

[0050] Each coil comprises for example: a plastic body called field frame; two terminal lugs or connection plugs; and a wire which is wound on the body and connected at both ends to the two terminal lugs to be connected to the electronic board.

[0051] In Figure 1 and Figure 2 , a first electronic board PCB1 can be seen to which the pins of the coils 12 are connected and which is used to drive the rotor. For example, the coils 12 are electrically and mechanically connected to the first electronic board PCB1 by terminal lugs which are electrically connected to the coils by mechanical clamping.

[0052] In the example shown, there are three coils 12, the number of which is generally equal to 3n, where n is an integer at least equal to 1. The coils 12 are disposed in angular sectors a1 around the rotor.

[0053] The rotor 10 is mounted inside the stator and is intended to rotate in the stator around the axis X. The rotor 10 comprises for example a multipole magnet 21 which forms the outer surface of the rotor and faces the coils.

[0054] The rotor 10 comprises a bottom which forms a hub 20 comprising a pinion 24 on a downstream face opposite the face facing the accommodation, the pinion 24 forming a first sun gear of a gear reducer R. The first sun wheel 24 is thus directly rotationally driven by the hub 20.

[0055] The gear reducer further comprises a first carrier plate 26 and three first planetary gears 27 rotatably mounted to an upstream face of the carrier plate 26 around an axis parallel to the axis X. The first planetary gears 27 are in mesh with the first sun gear 24. A second sun gear 28 is rotatably formed in one piece with the first carrier plate 26 and is disposed on a downstream face of the first carrier plate 26 opposite the upstream face carrying the first planetary gears 27, along the axis X.

[0056] The gear reducer comprises a second carrier plate 30 and three second planetary gears 32 rotatably mounted to an upstream face of the second carrier plate 30 around an axis 32.1 parallel to the axis X. The second sun gear 28 is in mesh with the second planetary gears 32.

[0057] Advantageously, the planetary gears 27 and 32 are identical, which simplifies the manufacturing of the gear motor.

[0058] The output shaft rod A of the gear motor is rotatably formed in one piece with the second carrier plate 30 and protrudes from a downstream face of the second carrier plate 30 opposite the upstream face carrying the second planetary gears 32.

[0059] The output shaft rod A can be rotatably guided by a peripheral edge of an opening formed in the cover.

[0060] The gear reducer further comprises an outer ring gear 34 having an axis X, the outer ring gear 34 being arranged inside the rotor 10 and outside the first planetary gears 27 and the second planetary gears 32, so that the planetary gears 27 and 32 are in mesh with the ring gear 34. Thus, all the elements of the gear reducer are disposed inside the ring gear 34. The ring gear 34 is fixed relative to the housing 2.

[0061] Very advantageously, the ring gear 34 is embedded in the outer shell 4, for example by molding. Alternatively, the ring gear 34 is attached to the outer shell 4 by welding, gluing, screws, etc.

[0062] Very advantageously, a single centering shaft 38 passes through the gear reducer R and the motor M and ensures the centering of the different elements of the gear reducer and of the rotor 10 relative to the stator 8. The yoke 25 comprises a central passage passing through the first sun gear allowing the passage of the centering shaft 38. The air gap between the rotor 10 and the stator 8 is thus provided without the use of bearings. The cancellation of the bearings contributes to the longevity of the gear motor. Furthermore, the design of the gear motor is simplified and its mass is reduced.

[0063] The centring shaft 38 is axially and transversally held in the gear motor. To this end, the inner bottom of the cover 5 comprises a housing 41 receiving one longitudinal end 38.1 of the shaft 38, and the second planet carrier plate 30 carrying the output shaft also comprises a housing 43 between the second sun gears on its upstream face, which housing 43 receives the other end 38.2 of the shaft 38. When the second planet carrier plate 30 is guided by the output shaft A through the periphery of the opening in the cover 5, the other end of the centring shaft 38 is also axially and transversally held. The shaft 38 is fixedly mounted in the cover 5, for example the end 38.1 being mounted clamped in the housing 41 of the cover 5.

[0064] Furthermore, the first sun gear 24 and the second sun gear 28 comprise in their centre respectively an axial passage 42, 44 for the passage of the centring shaft 38 therethrough. The diameters of the housings 40, 41 and of the housings 42, 44 are adjusted to the diameter of the shaft 38 to ensure that the centring shaft 38 is transversally held and that the gear reducer components are properly rotatably guided.

[0065] The shaft 38 ensures the guidance, the re-centring of all the moving elements and also provides the function of the sliding bearings for the moving elements.

[0066] The centring shaft 38 is advantageously made of metal, for example steel, advantageously stainless steel, so as to have sufficient rigidity. The diameter of the shaft can be set precisely by a grinding operation. Advantageously, the shaft 38 is manufactured with high precision, for example by machining. The diameter of the shaft advantageously has a maximum tolerance of 20μ0 and a cylindricity of 5μ.

[0067] The clearance between the shaft 38 fixed in the housing and the moving elements is advantageously between 20μ0 and 60μ0.

[0068] The housing and the cover are arranged so that the housings 40 and 41 ensure the coaxiality between the centring shaft 38 and the ring gear 34.

[0069] The implementation of a fixed centring shaft and of a positioning precision, which can be obtained when the cover and the housing comprising the ring gear 34 are manufactured and assembled, makes it very advantageous not to use ball bearings between the centring shaft and the moving elements rotating around the centring shaft.

[0070] The implementation of this centring shaft 38 makes it possible to limit the wear of the gear reducer. Furthermore, it facilitates the assembly. For the gear reducer elements of plastic material, the centring shaft also ensures that there is sufficient clearance between the elements so that the elements mesh correctly.

[0071] Advantageously, the shafts of the planet gears on the planet carrier plates are made of steel, for example stainless steel, to further improve the guidance and avoid the wear of the teeth of the gears of the planetary gear reducer.

[0072] Moreover, since the rotatable moving element of the gear reducer turns around this small diameter shaft, the implementation of a single shaft can significantly reduce the losses.

[0073] The gear motor further comprises electric motor management sensors 17, for example Hall effect sensors sensitive to the displacement of the magnets 21 of the rotor, mounted to the first electronic board PCB1. The number of management sensors is equal to 3m, where m is an integer greater than 1.

[0074] Considering the radial direction, the management sensors 17 are arranged between the coil 12 and the rotor 10, and the two end management sensors define between them an angular sector a1.

[0075] The output shaft A is rotatably movable by the electric motor between two end positions PE1 and PE2. The first end position PE1 corresponds to a position of the core connecting the input port to the output port S1, and the end position PE2 corresponds to a position of the core connecting the input port to the output port PE2.

[0076] In the example shown, the core pivots by an angle of 96° to switch from the end position PE1 to the end position PE2.

[0077] The intermediate position is located at a position 48° from each of the end positions PE1 and PE2.

[0078] The gear motor comprises an angular position sensor 56 of the output shaft A to detect the angular position of the core between the two end positions PE1 and PE2. The position sensor 56 is sensitive to a magnetic field variation, for example it is a Hall effect sensor.

[0079] The position sensor is mounted to a second electronic board PCB2, a permanent magnet 58 being attached to the output shaft A and positioned with respect to the position sensor 56 so that its rotational movement and thus the rotational movement of the output shaft are detected by the position sensor 56. As can be seen from Figure 3C As can be seen from the figure, when considering the longitudinal direction, the position sensor is arranged in vertical straight line with a portion of the position magnet. The distance between the magnet and the sensor 56 is for example 1.2 mm ± 0.2 mm.

[0080] The magnet 58 is derived from a diametrically magnetized ring magnet, i.e. where the field lines are aligned with the diameter. The magnet is formed from an angular portion of the ring magnet. The south S pole and the north N pole are as Figure 3A indicated. The magnet 58 is for example made of a mixture of neodymium, iron and boron powder, and a binder, for example polyamide PA12, for example by injection.

[0081] The second electronic board PCB2 is arranged axially distant from the first electronic board PCB1. In the example shown, the board PCB2 and the position sensor are advantageously disposed outside the casing and at least partially around the output shaft A, further isolating the position sensor from the magnet 21.

[0082] For example, the boards are at a distance of 10 mm. Preferably, this distance is as large as possible, so as to limit mutual interference.

[0083] In the example shown, the board PCB2 comprises a recess having a radius corresponding to that of the output shaft A, so that the board PCB2 can be placed as close as possible to the output shaft A.

[0084] The position sensor 56 is mounted to the second electronic board PCB2 in such a way that the magnet 58 can take angular positions having little or no effect on the management sensor 17.

[0085] As seen in Figure 3A , 3B and 3D, the magnet 58 has the shape of a circular arc and its angular extension is such that, when the output shaft A is in either of the end positions PE1 and PE2, the magnet is still facing the position sensor and such that, considering the projections of the management sensor and of the magnet 58 in the same plane orthogonal to the axis X, no part of the projection of the position magnet 58 faces the management sensor in the radial direction.

[0086] The position sensor 56 measures the angle β (°) between the sensor and the magnet, which is measured between a radius passing through the middle region of the position sensor 58 and a radius passing through the connection region of the two poles.

[0087] In Figure 4B and 4C , the magnet 58 can be seen in the two end positions PE1 and PE2 of the output shaft A. In Figure 4A , the magnet is in a central position with respect to the position sensor 56.

[0088] In the example shown Figure 3C , the magnet 58 partially faces the position sensor 56, considering the axial direction. More specifically, the magnet 58 is located between the electronic boards PCB1 and PCB2.

[0089] In Figure 3DIn the middle, the output shaft stem A and the magnet 58 can be seen. The output shaft stem A comprises a downstream oriented shoulder 60 on which the magnet 58 is mounted. The magnet is for example snapped and / or glued to the output shaft stem A. Advantageously, the position magnet 58 is snapped to the output shaft stem. For example, the output shaft stem A comprises a housing for the magnet 58, the housing being formed in the shoulder. The magnet 58 comprises a spot facing 61 cooperating with a flat member of the housing, and a tongue 62 protruding from a corner end of the magnet 58 and cooperating with a recess of the housing, so as to ensure that the magnet is at least temporarily held and secured, and that the north and south poles of the magnet are always mounted in the same direction. The magnet 58 is then glued to ensure that it is indeed attached to the output shaft stem. Preferably, the gluing is achieved by polymerization, which provides good retention at high temperature. Alternatively, the housing comprises a protrusion received in a recess in the magnet. Preferably, the depth of the housing is such that the free surface of the magnet 58 is flush with the shoulder 60.

[0090] Preferably, the angular extension of the magnet 58 has the greatest linear variation and provides the greatest slope, as will be explained below.

[0091] Alternatively, considering the radial direction, the magnet 58 is arranged facing the position sensor, i.e. the magnet is interposed between the shaft stem and the position sensor. The magnetization of the magnet is then adjusted.

[0092] A practical example of the arrangement and dimensions of the sensor and the magnet 58 will be described.

[0093] The management sensors 17 are arranged on the first electronic board PCB2 next to each other at an angle a1 equal to 12°.

[0094] The position sensor 56 is provided on the second electronic board PCB1 around the output shaft stem. The angle between the position sensor and one of the management sensors located at the edge is equal to 142°.

[0095] The two end positions of the core are separated by an angle of 90°.

[0096] The magnet 58 has an angular extension of 100°. In the middle position of the core, and therefore of the output shaft stem, i.e. when the core is in the middle position, the position sensor 56 is located at an angle of 50° from each of the angular ends of the magnet 58. Figure 4A Therefore, whatever the angular position of the output shaft stem A between the two end positions, the position magnet 58 always faces the position sensor. The position sensor is not point-like, but its position is considered to be the position of the radius passing through the middle of the position sensor.

[0097] Whatever the angular position of the magnet 58, considering the radial direction, none of the parts in the projection of the magnet 58 face the management sensors Figure 4B andFigure 4C ).

[0098] Advantageously, the magnet 58 and the output shaft rod A comprise safety means for mounting the magnet to the output shaft rod to ensure that each magnet of each dispenser is mounted identically and that each position sensor provides the same response, i.e. the same voltage variation as a function of the angular position of the output shaft rod.

[0099] In Figure 5 , it can be seen that for a diametrically magnetized annular magnet, the magnetic field varies as a function of the angle β. It is observed that the angular portion between -50° and +50° has a substantially linear variation with a large slope.

[0100] The magnet 58 is preferably mounted so that the position sensor delivers a voltage value as a function of the angular position, for example the voltage value represented in Figure 6 .

[0101] If the magnet is mounted in the opposite way, i.e. the south pole instead of the north pole, the slope of the voltage variation will be negative. Advantageously, safety means are provided to avoid this situation.

[0102] Very advantageously, during the manufacturing process, a separate calibration step of each dispenser is carried out to guarantee that for a given voltage, the angular position of the core is the same.

[0103] For example, the output shaft rod and the magnet rotate between -3° and 93°, the sensor detecting that the magnetic field B from the magnet varies between -100 mT and +100 mT over this rotation amplitude.

[0104] The sensor is programmed so that the end position of -3° and its field correspond to an output voltage of 0.5 V, while the end position of 93° and its field correspond to an output voltage E of 4.5 V. Each intermediate position is proportionally allocated a voltage.

[0105] The electronic control unit adjusts the valve position by programming the corresponding voltage value E.

[0106] The valve is a proportional valve between two output ends.

[0107] Alternatively, the valve comprises an input end and an output end, the opening or closing of the valve being proportional.

[0108] It will be understood that the angular extension of the magnet 58 is chosen as a function of the angle between the end positions of the core.

[0109] In the example shown and preferably, the electric motor is a three-phase motor comprising a number of coils 12 distributed uniformly in degrees around the axis X, the number of coils being a multiple of 3. However, two-phase motors, more generally multiphase motors, do not depart from the scope of the invention.

[0110] The outer shape of the gear motor is not limited, it is chosen according to the environment of the motor and the manufacturing possibilities.

[0111] The hydraulic distributor is particularly suitable for use in the automotive field, in particular for cooling internal combustion engines, but it can be used in any other field.

Claims

1. A rotary fluid distributor, comprising: a valve body having at least one fluid inlet port and one fluid outlet port; a core capable of permitting or interrupting fluid flow between the inlet port and the outlet port, the core being rotatably movable about a longitudinal axis and configured to have two end angular positions; A gear motor comprising a gear reducer, a brushless electric motor and an output shaft having a longitudinal axis (X), wherein the core is rotatably fixed to the output shaft, a sensor (17) for managing the electric motor is mounted on a first electronic board (PCB1) and faces the side of the rotor of the gear motor, at least one angular position sensor for detecting the angular position of the output shaft is mounted on a second electronic board (PCB2), the first electronic board (PCB1) and the second electronic board (PCB2) being arranged at two different positions orthogonal to the longitudinal axis (X). In the same plane, a permanent magnet (58) is rotatably fixedly mounted to the output shaft (A) and is arranged to be detected by the angular position sensor, wherein the permanent magnet (58) has an arc shape, and the position and angular extension of the permanent magnet are such that the core is placed at any position between the end angular positions of the core regardless of the angular position of the output shaft (A), considering that the projection of the magnet and the projection of the management sensor are on the same plane orthogonal to the longitudinal axis, the projection of the permanent magnet (58) does not face the projection of the management sensor (17) in the radial direction.

2. The rotary fluid distributor according to claim 1, wherein: The gear motor includes a housing for accommodating the motor and the gear reducer, wherein the first electronic board (PCB1) is accommodated in the housing, and the second electronic board (PCB2) is arranged outside the housing and between the housing and the valve body.

3. The rotary fluid distributor according to claim 1 or 2, wherein: The permanent magnet (58) is a magnet magnetized in diameter.

4. The rotary fluid distributor according to claim 1 or 2, wherein: The valve body comprises two outlet ports, and wherein one of the end angular positions corresponds at least predominantly to a flow between one of the outlet ports and the inlet port, and the other end angular position corresponds at least predominantly to a flow between one of the outlet ports and the inlet port.

5. A rotary fluid distributor according to claim 1 or 2, comprising an orienting device for orienting the permanent magnet (58) relative to the output shaft (A) so as to position the north pole and the south pole of the magnet in a given orientation relative to the output shaft (A).

6. The rotary fluid distributor according to claim 5, wherein: The orientation device comprises a countersunk surface formed in the magnet, the countersunk surface cooperating with a flat member carried by the output shaft (A), and a protruding element (62) carried by the output shaft (A) or the permanent magnet (58) and cooperating with a recessed element correspondingly carried by the permanent magnet (58) or the output shaft (A).

7. The rotary fluid distributor according to claim 1 or 2, wherein: The permanent magnet (58) is bonded to the output shaft.

8. The rotary fluid distributor according to claim 1 or 2, wherein: The motor comprises a coil attached to and electrically connected to the first electronic board (PCB1).

9. The rotary fluid distributor according to claim 8, comprising three coils (12) or a multiple of three.

10. The rotary fluid distributor according to claim 1 or 2, wherein: The gear reducer (R) is at least partially housed in the rotor (10).

11. The rotary fluid distributor according to claim 1 or 2, wherein: The gear reducer is a planetary gear reducer, and the gear motor includes a single shaft forming the rotation axis of the rotor and the shaft of the planetary gear reducer.

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