DE112013003092B4 - Drive module for a vehicle seat, adjusting mechanism and seat for a motor vehicle - Google Patents

Abstract

Drive module (4) for a vehicle seat, the drive module (4) comprising: - an output pinion (58) which is provided to offset the displacement of a mobile element (4a, 4b, 75) which is connected to a seat part frame (3) to drive, - a housing (10) which accommodates: - a piezo-electric motor (6) which has a rotor (61) which is rotatable about an axis (A), - a reduction gear (5) which between the rotor (61) and the output pinion (58) is arranged.

Description

The present invention relates to a drive module for a vehicle seat, the vehicle seat having a seat surface with a seat part frame which is arranged on a bearing, as well as an adjusting mechanism comprising a drive module and a seat for a motor vehicle.

The invention relates in particular to a motorized drive device, and in this case further in particular to a drive device which comprises an output pinion which is provided to drive the displacement of a mobile element which is connected to the seat subframe in order to fully or partially relate to the seat surface to let the bearing rise or fall, or to allow a part of the seat surface, for example the front portion of the seat surface, to move in relation to the seat part frame.

In the known prior art DE 10 2008 063 450 A1 Such a device comprises an electric motor of the type of a DC motor, which has a rotor which can rotate about an axis, and a reduction gear which is arranged between the rotor and the output pinion, the output pinion driving the rotation of such a mobile element.

The known state of the art DE 10 2006 019 871 A1 comprises such a device with at least one piezo-electric motor which can rotate about an axis, wherein the output pinion drives the rotation of such a mobile element.

This type of drive device is accompanied by noises during operation, which can be disturbing, and the space volume required for installing the motor and the reduction gear is considerable.

It appeared necessary to reduce the noise during operation as well as the space requirement of such drive devices.

The invention proposes a drive module in which the motor is a piezo-electric motor. The module further comprises a housing which accommodates the motor and the reduction gear.

With the help of these arrangements and arrangements, it is possible to reduce the noise during the operation of such drive devices, and such drive devices can be installed in a simpler manner because of their reduced space requirements.

• - Gemäß einem Aspekt können der Rotor des Motors und das Abtriebsritzel alle beide um dieselbe Achse drehen; mittels dieser Ausgestaltung ist das Modul kompakt und kann auf eine einfache Weise auf einem Sitzteilrahmen eingebaut werden;
• - Gemäß einem anderen Aspekt umfasst das Untersetzungsgetriebe ein umlaufendes Ritzel zum Ausführen einer Kreisschiebung, welches mit einem gezahnten Rad der Abtriebsvorrichtung im Eingriff steht, welches mit dem Abtriebsritzel fest verbunden ist, und umfasst eine Oldham-Kupplung; mittels dieser Ausgestaltung kann das Untersetzungsverhältnis des Untersetzungsgetriebes erheblich sein, und kann die Achsverschiebung der orbitalen Bewegung (oder der „Kreisschiebung“) kompensiert werden;
• - Gemäß einem anderen Aspekt umfasst das Untersetzungsgetriebe ein Gleitelement, welches in einem Lagerelement gleitet und vorgesehen ist, Kräfte aufzunehmen, welche auf das Abtriebsritzel ausgeübt werden im Falle einer Erschütterung; mittels dieser Ausgestaltung kann die Vorrichtung einem erheblichen Moment widerstehen, welches auf das Abtriebsritzel wie zum Beispiel im Falle einer Erschütterung ausgeübt wird;
• - Das Lagerelement kann an einem Gehäuse fixiert sein/werden, wobei der Stator des Motors direkt auf dem Lagerelement fixiert ist/wird; was zur Folge hat, dass die axiale Ausdehnung bzw. Dimension optimiert werden kann, mittels welcher Ausgestaltung die Vorrichtung sehr kompakt sein und auf eine einfache Weise auf einem Sitzteilrahmen verbaut werden kann.
• - Gemäß einem anderen Aspekt umfasst das umlaufende Ritzel vorspringende Nasen, welche in Vertiefungen bzw. Rillen des Gleitelements aufgenommen sind/ werden; was zur Folge hat, dass die Kräfte, welche auf das umlaufende Ritzel im Falle einer Erschütterung ausgeübt werden, auf das Gleitelement und auf das Gehäuse übertragen werden.
• - Gemäß einem anderen Aspekt kann das Antriebsmodul eine im Wesentlichen zylindrische Form aufweisen, und kann die axiale Lange der Vorrichtung mit dem Abtriebsritzel und mit einer eingeschlossenen elektronischen Steuerkarte auf eine vorteilhafte Weise weniger als 70 mm betragen, was zur Folge hat, dass der Raumbedarf begrenzt ist/wird, mittels welcher Ausgestaltung die Vorrichtung sehr kompakt sein kann und auf eine einfache Weise auf dem Sitzteilrahmen verbaut werden kann;
• - Gemäß einer weiteren Lösung umfasst das Untersetzungsgetriebe einen fixierten Flansch, welcher wenigstens zwei in Richtung des umlaufenden Ritzels hervorspringende Zapfen aufweist, und das umlaufende Ritzel Ausnehmungen aufweist, welche die Zapfen aufnehmen und breiter als die Zapfen sind, um die umlaufende Bewegung zu erlauben und gleichzeitig die Drehung des umlaufenden Ritzels um die Achse herum zu verhindern; dies stellt eine alternative Lösung für das oben erwähnte Gleitelement bereit;
• - Gemäß einem anderen Aspekt kann das Untersetzungsgetriebe ein einstufiges Untersetzungsgetriebe mit einer Oldham-Kupplung sein; dies stellt eine kostengünstige Lösung einer optimierten Größe bzw. Ausdehnung bereit;
• - Gemäß einem anderen Aspekt kann die nominelle Drehgeschwindigkeit des Abtriebsritzels weniger als 20 Umdrehungen pro Minute betragen; dies erlaubt es, ein vorteilhaftes Moment bereitzustellen;
• - Gemäß einem anderen Aspekt kann das Untersetzungsgetriebe ein Untersetzungsgetriebe in der Form eines Doppelplanetengetriebes sein; dies ist eine robuste und wohlbekannte Lösung;
• - Gemäß einem anderen Aspekt umfasst das Gehäuse einen Körper in der Form einer Glocke sowie einen Deckel, welcher komplementär zum Körper ist, um das Gehäuse zu schließen; dies bildet ein kompaktes und ein auf eine einfache Weise zusammenzusetzendes Modul;
• - Gemäß einem anderen Aspekt weist das Gehäuse eine im Wesentlichen zylindrische Form mit einem Durchmesser auf, welcher weniger als 100 mm beträgt; dies vereinfacht dessen Verbau.

According to various embodiments of the invention, one and / or the other of the following embodiments can optionally be used.

• - According to one aspect, the rotor of the motor and the output pinion can both rotate about the same axis; by means of this configuration, the module is compact and can be installed in a simple manner on a seat part frame;
• - According to another aspect, the reduction gear comprises a rotating pinion for performing a circular shift, which is in engagement with a toothed wheel of the output device, which is firmly connected to the output pinion, and comprises an Oldham coupling; By means of this configuration, the reduction ratio of the reduction gear can be considerable, and the axial displacement of the orbital movement (or the "circular displacement") can be compensated;
• - According to another aspect, the reduction gear comprises a sliding element which slides in a bearing element and is provided to absorb forces which are exerted on the output pinion in the event of a shock; by means of this configuration, the device can withstand a significant moment exerted on the output pinion such as in the event of a shock;
• The bearing element can be fixed on a housing, the stator of the motor being / will be fixed directly on the bearing element; As a result, the axial expansion or dimension can be optimized, by means of which configuration the device can be very compact and can be installed in a simple manner on a seat part frame.
• - According to another aspect, the revolving pinion comprises projecting lugs which are / are received in recesses or grooves of the sliding element; As a result, the forces that are exerted on the rotating pinion in the event of a shock are transmitted to the sliding element and to the housing.
• - According to another aspect, the drive module can have a substantially cylindrical shape and the axial length of the device with the output pinion and with an electronic control card included can advantageously be less than 70 mm, with the result that the space requirement is limited is / becomes, by means of which configuration the device is very compact can be and can be installed in a simple manner on the seat part frame;
• - According to a further solution, the reduction gear comprises a fixed flange which has at least two pins protruding in the direction of the rotating pinion, and the rotating pinion has recesses which receive the pins and are wider than the pins to allow the rotating movement and at the same time to prevent the rotating pinion from rotating about the axis; this provides an alternative solution for the above mentioned sliding element;
• - According to another aspect, the reduction gear can be a single-stage reduction gear with an Oldham coupling; this provides an inexpensive solution of an optimized size;
• - According to another aspect, the nominal speed of rotation of the output pinion can be less than 20 revolutions per minute; this allows an advantageous moment to be provided;
• - According to another aspect, the reduction gear can be a reduction gear in the form of a double planetary gear; this is a robust and well known solution;
• - According to another aspect, the housing comprises a body in the form of a bell and a cover which is complementary to the body to close the housing; this forms a compact module and a module that is easy to assemble;
• - According to another aspect, the housing has a substantially cylindrical shape with a diameter which is less than 100 mm; this simplifies its installation.

In addition, the invention also relates to a hinge mechanism or adjusting mechanism which comprises a drive device, as described above, and a rod or a connecting rod which forms the mobile element driven by the device; this rod or connecting rod is in engagement with the drive device, for example by means of a toothed portion; By means of this configuration, the movement of the rod or the connecting rod can increase or decrease the seat surface as a whole or in part in relation to the bearing, and a complementary reduction gear can also be provided between the rotation of the output pinion and the rotation of the rod or the Connecting rods; the rod or the connecting rod can also move the front portion of the seat surface of the seat; the mobile element could furthermore be a toothed rack for converting the rotation of the output pinion into a translational movement.

According to another aspect of the invention, such an adjusting mechanism can also comprise an elastic restoring device which exerts a restoring moment on the rod or the connecting rod; By means of this configuration, the elastic return device can compensate for the force of gravity or the weight and exert a moment which tends to increase the seat surface in whole or in part.

The invention is also directed to a vehicle seat which comprises an adjustment mechanism, as described above.

• - die 1 eine schematische und teilweise Ansicht einer Struktur eines Sitzes ist, welche eine Antriebsvorrichtung gemäß einer Ausführungsform der Erfindung umfasst,
• - die 2 ein Detail der Struktur der Sitzfläche des Sitzes aus der 1 zeigt,
• - die 3 eine explodierte und perspektivische Ansicht der Antriebsvorrichtung aus der 1 bei einer Betrachtung aus einer ersten Richtung ist,
• - die 4 eine explodierte und perspektivische Ansicht der Antriebsvorrichtung aus der 1, analog zu der 3, bei einer Betrachtung aus der entgegengesetzten Richtung ist,
• - die 5 ein transversaler Schnitt der Antriebsvorrichtung aus der 1 entlang der Linie V-V aus der 6 ist,
• - die 6 ein axialer Schnitt der Antriebsvorrichtung aus der 1 entlang der Linie VI-VI aus der 5 ist,
• - die 7 eine Variante betreffend ein Untersetzungsgetriebe mit einer Oldham-Kupplung darstellt.

Further aspects, objects and advantages of the invention will become clear upon reading the following description of one of its embodiments, which is given by way of example and not in a restrictive manner and with reference to the accompanying drawings, wherein:

• - the 1 is a schematic and partial view of a structure of a seat comprising a drive device according to an embodiment of the invention,
• - the 2 a detail of the structure of the seat of the seat from the 1 shows,
• - the 3 an exploded and perspective view of the drive device from FIG 1 when viewed from a first direction,
• - the 4th an exploded and perspective view of the drive device from FIG 1 , analogous to the 3 when viewed from the opposite direction is
• - the 5 a transverse section of the drive device from FIG 1 along the line VV from the 6th is
• - the 6th an axial section of the drive device from FIG 1 along the line VI-VI from the 5 is
• - the 7th represents a variant relating to a reduction gear with an Oldham coupling.

The same reference numbers refer to identical or similar elements throughout the several drawings.

The 1 represents in a schematic way and partially a vehicle seat which has a seat surface ( 2 ) with a seat frame ( 3 ), a backrest ( 19th ), which on the seat ( 2 ) is mounted, the whole on a bearing ( 1 ) by means of one or more Joint mechanisms is mounted. This or these joint mechanisms can in particular be a mechanism for straightening and / or one or two mechanisms for tilting, which can be obtained in particular, but not exclusively, by means of rods or connecting rods ( 4a ; 4b). For example, for each of the rods or connecting rods ( 4a ; 4b ) the lower end connected to the bearing ( 1 ), and the upper end is connected to the seat frame ( 3 ) the seat ( 2 ) of the seat.

The seat part frame ( 3 ) the seat ( 2 ) has substantially a right side and a left side which are of a similar type; on the 1 a single side is shown, from which it follows that on the side not shown there are further rods or connecting rods for the connection between the seat surface ( 2 ) and the warehouse ( 1 ), which are equivalent to the rods or connecting rods shown ( 4a ; 4b) are.

Described in more detail, in the example shown, a first rod ( 4a) the front section ( 1a) of the camp ( 1 ) (swivel mounting with the reference axis ( 11 )) on a front section ( 3a) of the seat frame ( 3 ) the seat ( 2 ) (swivel mounting with the reference axis ( 13 )), and connects a second rear bar ( 4b) with the rear section ( 1p) of the camp ( 1 ) (swivel mounting with the reference axis ( 12th )) on the rear section ( 3p) of the seat frame ( 3 ) (swivel mounting with the reference axis ( 14th )). In the example shown, the pivoting assemblies of the first and second rods or connecting rods ( 4a ; 4b) all with axes parallel to the transverse axis Y which are perpendicular to the longitudinal axis X and perpendicular to the vertical axis Z is (see the 1 ).

The seat ( 2 ) of the seat can also be equipped with a front section ( 2a) a mobile seat further up and / or extending lengthways. In the case of tilting the front section ( 2a) the seat ( 2 ) connects an auxiliary rod ( 75 ) the seat frame ( 3 ) with the front section ( 2a) the seat ( 2 ), where the auxiliary rod ( 75 ) can be set in motion by means of a drive device ( 4th ) by means of a toothed section ( 76 ).

It can also be provided that the bearing ( 1 ) is slidably mounted in relation to the floor of the vehicle by means of longitudinal slide rails ( 90 ), which has a fixed rail ( 90b) , which is fixed to the floor of the vehicle, and a movable rail ( 90a) , which are firmly connected to the moving bearing ( 1 ) is included.

Of course, the backrest ( 19th ) can be swiveled in relation to the seat ( 2 ) as is well known in the art.

The rods or connecting rods ( 4a ; 4b) can be offset in an independent manner by respective control means or can be controlled simultaneously by synchronized control means or by means of a mechanical link (not shown) which can connect them.

As soon as the first rod or connecting rod ( 4a) is / is swiveled counterclockwise by means of a drive device ( 4th ), the front section rises ( 2a) , which is with the seat ( 2 ) is connected to the top, whereas as soon as the front rod or connecting rod ( 4a) is pivoted clockwise, the front section ( 2a) the seat ( 2 ) lowers towards the floor. As soon as the second rod or connecting rod ( 4b) is / is swiveled counterclockwise (by means of another drive device ( 4th )), the rear section rises ( 2p) the seat ( 2 ) upwards, whereas as soon as the second rod or connecting rod ( 4b) is swiveled clockwise, the rear section ( 2p) the seat ( 2 ) lowers towards the floor.

As soon as the two rods or connecting rods ( 4a ; 4b ) are / are controlled at the same time, the seat moves ( 2 ) substantially parallel to the floor, which is referred to as a righting movement. When the first rod or connecting rod ( 4a) is / is controlled without the second rod or connecting rod ( 4b) moves, or vice versa, you get a tilting movement of the seat ( 2 ). According to an arrangement as in the 1 shown schematically, the front hinge mechanism, which the first rod or the first connecting rod ( 4a) includes, be / will be equipped with a reset device ( 95 ) which tends to push the rod ( 4a) to pan clockwise and a moment upwards towards the front section ( 2a) the seat ( 2 ) to be exercised in such a way that the weight effects, which are generated by the weight of the seat and / or the occupant sitting on the seat, can be at least partially compensated for by the effect of this reset device ( 95 ).

A similar reset device can of course be provided with regard to the second rod or connecting rod ( 4b) .

This reset device ( 95 ) can have different shapes or forms, such as a torsion spring or torsion spring, which advantageously one of the transverse bars ( 35 ) can be, which at the reference axes ( 11 , 12th , 13 or 14th ) are / will be installed.

Like in the 2 is / is the front rod or connecting rod ( 4a) (or the rear rod or connecting rod ( 4b) ) firmly connected with a transverse rod ( 35 ), which extends along the transverse axis Y extends and connects the bar shown to an equivalent bar, which is on the other side of the structure of the seat ( 2 ) (not shown) is arranged. On top of that, the rod or connecting rod ( 4a) firmly connected to a control flange ( 34 ), which is designed as a metallic plate which extends along or in a plane X , Z extends. This control plate ( 34 ) the connecting rod ( 4a) is / will be directly connected to the transverse bar ( 35 ) and / or the rod or connected and comprises on an outer section with a substantially circular shape a toothed zone ( 33 ), which is intended to be used with the motorized drive device ( 4th ) to cooperate or work together, which the output pinion ( 58 ), which is in direct engagement with the above-mentioned toothed section ( 33 ) arrived.

Such a drive device ( 4th ) only on one side of the seat frame ( 3 ) the seat ( 2 ) the seat arranged; the other side can be provided without such. The output pinion ( 58 ) is arranged in a way around an axis A. which is substantially parallel to the transverse axis Y is to turn.

A protective case ( 32 ) can be provided to partially or almost entirely remove the output pinion ( 58 ) to cover apart from the zone which is covered with the toothed section ( 33 ) is engaged or has come.

A second drive device, which is similar to the first, can be provided to drive the rear rod or connecting rod ( 4b) to drive in a similar manner.

With reference to the 3 to 6th the drive device ( 4th ) to be discribed. At the very beginning it should first be noted that the drive device or devices ( 4th ), which have been mentioned above, present themselves as a module.

The latter includes a housing ( 10 ) with a body ( 10a) and a lid ( 85 ), the body having the shape of a cylindrical bell with a bottom ( 88 ) and an annular wall ( 89 ), and the lid ( 85 ) the shape of a disk with a circumferential axial edge ( 10b) and this circumferential axial edge ( 10b) on the annular wall ( 89 ) of the body ( 10a) is / is fixed from the outside (see the 6th ). The lid ( 85 ) is molded from a metal, and the body ( 10a) can be formed from a metal or a light alloy, even from a plastic.

Inside the case ( 10a) are the two main elements of the drive module ( 4th ), more precisely a piezo-electric motor ( 6th ) and a reduction gear ( 5 ), which in a coaxial manner one following the other on the axis A. are arranged or downstream. The piezo-electric motor ( 6th ) includes a stator ( 62 ) with a general shape of a disc as well as a rotor ( 61 ), which also has the shape of a disk, for example that of a slimmer disk than the stator ( 62 ), as well as a piezo-electric ring ( 63 ), which has the shape of a circumferential flat ring, which in one to the axis A. transverse plane is arranged.

A large number of piezo-electric elements are in the ring ( 63 ) and are arranged by conductors ( 66 ) connected to an electronic control unit (not shown in the figures), which enables advancing waves in the circumferential sense of this piezo-electric ring ( 63 ) to create. This piezo-electric ring ( 63 ) is adjacent to a circumferential zone ( 62c) of the stator ( 62 ) arranged that the generated waves are converted by the piezo-electric elements into mechanical waves which are sent to the stator ( 62 ) be transmitted. In addition, a disc spring or Belleville washer ( 64 ) an axial force to the rotor ( 61 ) against the stator ( 62 ) in such a way that the stator ( 62 ) generated mechanical waves are transformed into rotating or circumferential forces, which act on the rotor ( 61 ) act to make this move around the axis A. to move. An axially centered recess, labeled (61e), allows the rotor ( 61 ), its rotary motion to a control shaft ( 7th ), which is equipped with grooves ( 7e) which are complementary with their hollowed out shapes and are / are mounted in the axially centered recess ( 61e) . In this way an electric motor is obtained which is known as the type of piezo-electric motor ( 6th ), which generate a rotary motion and act on the rotor ( 61 ) can be transmitted, for example in a range of speeds which is between 100 and 400 revolutions per minute, for example 200 revolutions per minute.

The piezo-electric motor ( 6th ) at the control shaft ( 7th ) generated rotary movement is / is transmitted to the reduction gear ( 5 ) transmitted, which is located on the output side of the piezo-electric motor or the piezo-electric motor ( 6th ) is downstream, and its output is in the Shape of the output pinion ( 58 ), which has already been mentioned above.

In particular, in the example shown here, the reduction gear ( 5 ) the drive shaft ( 7th ) an eccentric section ( 70 ), which is / is received in an axial bore ( 53a) a so-called rotating pinion ( 53 ). The axis of this rotating pinion ( 53 ) describes due to the effect of the rotation of the eccentric section ( 70 ) an orbital movement with a radius which is equivalent to the eccentricity of the eccentric section ( 70 ), which is also called a hypocycloidal movement or is furthermore called a movement of a circular displacement. In addition, the rotating pinion ( 53 ) an outer circular circumferential toothed zone ( 53b) , which is permanently engaged by means of a section of the toothing with a circumferential toothed crown ( 54 ), which radially outwards from the rotating pinion ( 53 ) is located. On top of that, the revolving pinion ( 53 ) noses protruding in the axial direction ( 21st ), which in wells ( 22nd ) of a guide element, which sliding element ( 52 ) and will be described in detail below.

This sliding element ( 52 ) is arranged in order to be able to move exclusively by translation without a rotary movement around the axis A. around, which causes the rotating pinion ( 53 ) an offset around the axis A. around, but without going around the axis A. to turn around. In addition, because the number of outer teeth of the rotating pinion ( 53 ) is smaller than the number of teeth on the crown ( 54 ), a toothed zone of the output device located radially inwards ( 56 ), transmits the orbital movement of the rotating pinion ( 53 ) a rotation of the output device ( 56 ). In the example shown, in which the difference in the number of teeth between the two toothed sections is one tooth, the crown ( 54 ) every time the eccentric section ( 70 ) rotates one revolution or one tour, one tooth or advances one tooth, resulting in a rotation around the axis A. leads around. In the example shown here, the rotating pinion ( 53 ) thirty-five teeth, whereas the crown ( 54 ) includes thirty-six teeth, giving a reduction ratio of 35 of the reduction gear ( 5 ) results.

The sliding element ( 52 ) is / is received in the bearing element ( 51 ), which is fixed in relation to the housing ( 10 ) remains by means of 5 cylindrical feet ( 51a) , which in four corresponding holes ( 87 ) which are inserted in the fixed lid ( 85 ) of the module ( 4th ) are trained.

The sliding element ( 52 ) includes four arms ( 52a , 52b , 52c , 52d) which extend in one to the axis A. vertical plane, and which are / are recorded in grooves ( 51b) , which in the bearing element ( 51 ) are designed to translate in the direction W. which is perpendicular to the axis A. is to enable and to avoid any rotation of the sliding element ( 52 ) around the axis A. to prevent. On top of that, the sliding element ( 52 ) the wells ( 22nd ), which have been mentioned above, and which extend in the direction V which is perpendicular to the direction W. and to the axial direction A. so that the rotating pinion ( 53 ) move in the direction V inside the sliding element ( 52 ) can move, but without rotating around the axis A. running around. The sliding element ( 52 ) can in itself refer to the axis W. within the bearing element ( 51 ), but again without turning around the axis A. execute. This arrangement is also known as an Oldham coupling. The effect of this is that these two translations or offsets enable the orbital movement, which is caused by the eccentric section ( 70 ) is / is generated to compensate so that the movement of the output device ( 56 ) exactly coaxial with the input rotary movement or drive rotary movement of the control shaft ( 7th ) is.

• - eine Achswelle (8), welche durch das Abtriebsritzel (58), die Krone (54), welche mit der Abtriebsvorrichtung (56) ausgestattet ist, sowie teilweise durch die Steuerwelle (7) hindurchtritt, wobei in dem dargestellten Beispiel die Steuerwelle (8) einen Zapfen bzw. einen Sitz (80) an einem Ende umfasst, welcher in dem schützenden Gehäuse (32) (siehe die 2) aufgenommen werden kann,
• - ein Kugellager oder Rollen- bzw. Walzenlager (91), welches zwischen einer Zentralbohrung (62a) des Stators (62) und einem zylindrischen Zapfen der Steuerwelle (7) montiert ist/wird,
• - einen Ring (93), auf welchem sich die Tellerfeder bzw. Belleville-Scheibe (64), welche in einer axialen Öffnung (83) des Körpers (10a) des Gehäuses (10) aufgenommen ist/wird, stützt.
• - eine Schraube (92) zur Montage, welche obendrein in dem Beispiel mit einer Unterlegscheibe (92b) ausgestattet ist,
• - einen glatten Ring (86), welcher zwischen dem Abtriebsritzel (58) und dem Deckel (85) des Gehäuses (10) zwischengeschaltet ist.

The main elements that the piezo-electric motor ( 6th ) and the reduction gear ( 5 ) are completed by the associated elements, which are described below:

• - an axle shaft ( 8th ), which through the output pinion ( 58 ), the crown ( 54 ), which with the output device ( 56 ) and partly by the control shaft ( 7th ), whereby in the example shown the control shaft ( 8th ) a pin or a seat ( 80 ) at one end, which is in the protective housing ( 32 ) (see the 2 ) can be recorded,
• - a ball bearing or roller or roller bearing ( 91 ), which is between a central bore ( 62a) of the stator ( 62 ) and a cylindrical pin of the control shaft ( 7th ) is / will be installed,
• - a ring ( 93 ), on which the disc spring or Belleville washer ( 64 ), which in an axial opening ( 83 ) of the body ( 10a) of the housing ( 10 ) is / is supported.
• - a screw ( 92 ) for assembly, which in the example also has a washer ( 92b) Is provided,
• - a smooth ring ( 86 ), which is between the output pinion ( 58 ) and the lid ( 85 ) of the housing ( 10 ) is interposed.

Immobilization noses or fixing noses ( 62b) , which from the area in front of the stator ( 62 ) protrude, are / are taken up in openings ( 51b) of the bearing element ( 51 ) to the stator ( 62 ) when rotating around the axis A. to immobilize or fix around.

In this way the stator ( 62 ) of the motor ( 6th ) directly on the bearing element ( 51 ), which itself is attached to the housing ( 10 ) is / will be fixed. The bearing element ( 51 ) therefore fulfills two functions, namely the fixation of the stator ( 62 ) and the guide of the sliding element ( 52 ), which optimizes the axial extension or dimension of the module ( 4th ) allowed.

It should be noted that the reduction ratio of the reduction gear ( 5 ) can be encompassed by a range between 10 and 50 with the same arrangement of the rotating pinion ( 53 ) is retained.

According to an advantageous aspect, the reduction gear ( 5 ) a single stage reduction gear as shown. However, it is not excluded within the scope of the present invention, a reduction gear ( 5 ) of another type, for example a double planetary reduction gear. One could use in this way, for example, a reduction gear such as that described in document FR FR 2 706 380 A1 or in document FR FR 2 614 810 A1 is described.

According to an advantageous aspect of the invention, the nominal rotational speed of the output pinion ( 58 ) lower than 20 revolutions per minute and advantageously encompassed by a range between 5 and 20 revolutions per minute.

In the event of a shock that the vehicle experiences, considerable force can be exerted on the rods or connecting rods ( 4a ; 4b) and subsequently affect the output pinion ( 58 ) the drive device or the drive module ( 4th ) affect or transfer. Taking into account the relevant reduction ratio of the reduction gear ( 5 ) and the fact that the rotor ( 61 ) of the piezo-electric motor ( 6th ) is / is braked in the absence of a control by the disc spring or Belleville washer ( 64 ), which the rotor ( 61 ) against the stator ( 62 ) presses, the torque or moment generated by the output pinion ( 58 ) is exercised, essentially not towards the rotor ( 61 ) passed on or transferred, but mostly to the sliding element ( 52 ),

The sliding element ( 52 ) is provided to absorb forces that flow along the axis V , W. or both V and W. Act. The sliding element ( 52 ) is made of a metallic material such as steel, and in the same case the bearing element ( 51 ) from the sliding element ( 52 ) experienced forces to attach them to the lid ( 85 ) of the housing ( 10 ) transferred to; the bearing element ( 51 ) is preferably made of a metal, but can just as easily be made of a hard plastic material such as ABS or polypropylene or another.

According to an advantageous aspect of the present invention, the drive module ( 4th ) has a substantially cylindrical shape, for example with a diameter D. , which is smaller than 100mm, and preferably smaller than 90mm, and is the axial length E. of the drive module ( 4th ) apart from the output pinion ( 58 ) preferably less than 70mm.

It should be noted that the housing ( 10 ) in a fixed way to the seat frame ( 3 ) the seat ( 2 ) is fixed; for example it can be provided that the lid ( 85 ) on or on the seat frame ( 3 ) to solder or weld.

According to one in the 7th In the variant shown, the Oldham coupling, which allows the effect of the eccentricity to be compensated for, can have a different shape, the parts not described below being to be regarded as identical or similar in accordance with the description above.

In this variant, a flange ( 20th ) at the same time the role of the bearing element ( 51 ) and the sliding element ( 52 ). This flange ( 20th ) is firmly connected to the housing ( 10 ) or constitutes a substantial part of the latter; the flange ( 20th ) can by means of the fixations ( 29 ) attached to any frame or external part.

The flange ( 20th ) includes three pins ( 23 ) (at least two are necessary), which in one direction of the rotating pinion ( 53 ' ) jump out, whereby this revolving pinion ( 53 ' ) Recesses ( 24 ) which includes the tenons ( 23 ) record, tape. These recesses ( 24 ) are larger than the tenons ( 23 ), in order to enable the revolving movement, which is / is / is caused by the eccentricity of the orbital movement, and at the same time to enable the rotation of the revolving pinion ( 53 ' ) around the axis A. to prevent around. The orbital movement of the pinion ( 53 ' ), as described above, drives the output organ with exact coaxiality on the axis A. on.

The electronic control unit that controls the elements of the piezo-electric ring ( 63 ) controls, can be inside the housing ( 10 ), for example, on a card that is classified as an in its center drilled disc is formed. It can also be used outside the housing ( 10 ) be arranged in the vicinity of this.

List of reference symbols

1

camp

1a

Front section

1p

Back section

2

Seat

2a

Front section

3

Seat frame

3a

Front section

3p

Back section

4th

Drive device, drive module

4a, 4b

Rod or connecting rod

5

Reduction gear

6th

Piezo-electric motor

7th

Control shaft

7e

Grooves

8th

Axle shaft

10

casing

10a

body

10b

All around edge

11, 12, 13, 14

Reference axis

19th

backrest

20th

flange

21st

Noses

22nd

Depressions or grooves

23

Cones

24

Recesses

29

Fixation

32

Protective housing

33

Toothed zone

34

Control flange

35

Transverse bar

51

Bearing element

51a

Cylindrical feet

51b

Grooves

52

Sliding element

52a, 52b, 52c, 52d

poor

53, 53 '

Revolving pinion

53a

Axial bore

53b

Toothed zone

54

Crown

56

Output device

58

Output pinion

61

rotor

61e

Axially centered recess

62

stator

62a

Central bore

62b

Immobilization noses or fixing noses

62c

Circumferential zone

63

Piezo-electric ring

64

Disc spring or Belleville washer

66

ladder

70

Eccentric section

75

Auxiliary rod

76

Toothed section

80

Pin or seat

83

Axial opening

85

cover

86

Smooth ring

87

Corresponding holes

88

ground

89

Annular wall

90

Longitudinal slide rails

90a

Movable rail

90b

Fixed splint

91

Ball bearings or roller or roller bearings

92

screw

92b

Washer

93

ring

95

Reset device

A.

Axis of rotation of the output pinion

D.

Drive module diameter

E.

Length of the drive module

V

Extension direction of the recesses of the sliding element

W.

Direction of movement of the sliding element

X

Longitudinal axis

Y

Transverse axis

Z

Vertical axis

Claims (12)

Drive module (4) for a vehicle seat, the drive module (4) comprising: - An output pinion (58) which is provided to drive the displacement of a mobile element (4a, 4b, 75) which is connected to a seat part frame (3), - a housing (10) which accommodates: - A piezo-electric motor (6) which has a rotor (61) which is rotatable about an axis (A), - A reduction gear (5) which is arranged between the rotor (61) and the output pinion (58). Drive module (4) according to Claim 1 wherein the rotor (61) of the motor (6) and the output pinion (58) are configured to both rotate about the same axis (A). Drive module (4) according to Claim 1 or 2 , in which the housing (10) has a substantially cylindrical shape, and the axial length (E) of the housing (10) is less than 70 mm. Drive module (4) according to one of the Claims 1 to 3 , in which the reduction ratio of the reduction gear (5) is in a range between 10 and 50, and in which the nominal speed of rotation of the piezo-electric motor (6) is less than 400 revolutions per minute. Drive module (4) according to one of the Claims 1 to 4th wherein the housing (10) comprises a body (10a) with a bell shape and a cover (85) complementary to the body (10a) for closing the housing (10). Drive module (4) according to one of the Claims 1 to 5 , in which the reduction gear (5) is a single-stage reduction gear with an Oldham coupling. Drive module (4) according to one of the Claims 1 to 5 , in which the reduction gear (5) is a reduction gear in the form of a double planetary gear. Drive module (4) according to one of the Claims 1 to 6th in which the reduction gear (5) comprises a sliding element (52) which slides in a bearing element (51), the sliding element (52) being able to absorb forces which are exerted on the output pinion (58) in the event of a shock, and wherein the bearing element (51) is fixed on the housing (10) and a stator (62) of the motor (6) is fixed directly on the bearing element (51). Drive module (4) according to one of the Claims 1 to 8th , wherein the housing (10) has a substantially cylindrical shape with a diameter (D) of less than 100 mm. Drive module (4) according to one of the Claims 1 to 9 , in which the housing (10) further comprises an electronic control unit. Adjusting mechanism comprising a drive module (4) according to one of the Claims 1 to 10 as well as a mobile element which belongs to the seat frame (3) of the seat, in which the output pinion (58) is provided to drive the offset of a rod or a connecting rod (4a, 4b, 75), which is driven by the drive module (4) , movable element forms. Seat for a motor vehicle, comprising a drive module (4) according to one of the Claims 1 to 10 or an adjustment mechanism according to Claim 11 .

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