WO2022234508A1

WO2022234508A1 - Fitting system for a vehicle seat, and vehicle seat

Info

Publication number: WO2022234508A1
Application number: PCT/IB2022/054158
Authority: WO
Inventors: Matúš NEMČOK; Jozef PASTERNÁK; Andrej Medved
Original assignee: Adient Us Llc
Priority date: 2021-05-06
Filing date: 2022-05-05
Publication date: 2022-11-10

Abstract

The invention relates to a fitting system (100; 200) for a vehicle seat (1), the fitting system (100; 200) comprising a first fitting (110; 210) with a first driver (116; 216), a second fitting (120; 220) with a second driver (126; 226), a first shaft (112; 212) which is connected fixedly to the first driver (116; 216) for conjoint rotation, possibly after passing through an idle angle, wherein the first shaft (112; 212) can be rotated or pivoted about a first rotational axis (D1), a second shaft (122; 222) which is connected fixedly to the second driver (126; 226) for conjoint rotation, possibly after passing through an idle angle, wherein the second shaft (122; 222) can be rotated or pivoted about the first rotational axis (D1), wherein the first shaft (112; 212) is connected to the second shaft (122; 222) by means of a gear mechanism. The invention further relates to a vehicle seat (1) with a seat part (3), a backrest (4), and such a fitting system (100; 200).

Description

Adient US LLC, Plymouth, Ml (US)

FITTING SYSTEM FOR A VEHICLE SEAT, AND VEHICLE SEAT

The invention relates to a fitting system for a vehicle seat, the fitting system having a first fitting with a first driver, a second fitting with a second driver, a first shaft non-rotatably connected to the first driver, optionally after passing through an empty angle, the first shaft being a first axis of rotation is rotatable or pivotable, a second shaft non-rotatably connected to the second carrier, optionally after passing through an idle angle, the second shaft being rotatable or pivotable about the first axis of rotation. The invention also relates to a vehicle seat.

State of the art

DE 4023824 A1 discloses a vehicle seat whose backrest, which can be locked in selectable pivot positions, is connected to the seat frame on both sides of the seat by means of a joint fitting each, which has a gear that forms a gear connection between its two fitting parts that can be pivoted relative to one another about a pivot pin, wherein at least on one side of the seat there is a drive device assigned to the joint fitting arranged here and the joint pins of the two joint fittings are geared to one another via a shaft extending in the transverse direction of the seat, with the shaft being arranged offset in relation to the two joint pins and via a gear each with the two Pivot pin is in gear connection. WO 2005/023579 A1 discloses an adjuster for a vehicle seat, in particular for a motor vehicle seat, with a drivable gear fitting, the driven gear fitting moving a component of the adjuster and/or the vehicle seat, with the gear fitting being preceded by a gear stage with a fluctuating transmission ratio.

task

The invention is based on the object of providing a fitting system in which a continuous shaft arranged between two fittings can be dispensed with. The invention is also based on the object of providing a vehicle seat with such a fitting system, in particular of increasing the seating comfort of such a vehicle seat.

solution

This object is achieved according to the invention by a fitting system for a vehicle seat, the fitting system having a first fitting with a first driver, a second fitting with a second driver, a first shaft non-rotatably connected to the first driver, optionally after passing through an idle angle, wherein the first shaft can be rotated or pivoted about a first axis of rotation, a second shaft which is non-rotatably connected to the second driver, optionally after passing through an idle angle, wherein the second shaft can be rotated or pivoted about the first axis of rotation, the first shaft being connected to the second wave is connected.

A blank angle between the first shaft and the first driver can serve to compensate for tolerances. In each relative direction of rotation between the first shaft and the first driver, the idle angle is preferably less than five degrees, in particular less than three degrees. If the idle angle is zero degrees in each relative direction of rotation, the first shaft and the first driver are in each relative direction of rotation (also during a change in the relative direction of rotation) are always rotationally connected to one another.

An empty angle between the second shaft and the second driver can serve to compensate for tolerances. In each relative direction of rotation between the second shaft and the second driver, the idle angle is preferably less than five degrees, in particular less than three degrees. If the idle angle is zero degrees in each relative direction of rotation, the second shaft and the second driver are always rotationally connected to one another in each relative direction of rotation (even during a change in the relative direction of rotation).

Because the first shaft is connected to the second shaft by means of a gear, a continuous shaft between the fittings can be dispensed with. The gear, in particular a continuous shaft of the gear, can be arranged in an area in which the gear does not adversely affect the seating comfort.

The transmission can have a third shaft. The third shaft can be rotatable about a second axis of rotation. The third shaft can be pivotable about a second axis of rotation. The second axis of rotation can be arranged parallel to the first axis of rotation. The second axis of rotation can be arranged at a distance from the first axis of rotation. The second axis of rotation can be arranged parallel to and at a distance from the first axis of rotation. The second axis of rotation can be arranged below the first axis of rotation.

A first gear can be non-rotatably connected to the first shaft. A second gear can be non-rotatably connected to the second shaft. A third gear can be non-rotatably connected to the third shaft. A fourth gear can be non-rotatably connected to the third shaft. The first gear and the third gear may be arranged on a seat side. The second gear and the fourth gear may be located on an opposite side of the seat. The first gear may mesh with the third gear. The second gear may mesh with the fourth gear. A hand wheel can be provided for rotating the first shaft. The first shaft can be rotationally connected to the hand wheel. An operating lever can be provided for pivoting the first shaft. The first shaft can be rotationally connected to the control lever.

The first fitting can be designed as a geared fitting. The second fitting can be designed as a geared fitting. A gear fitting is known, for example, from WO 2011/151017 A1. The first fitting and the second fitting can each be designed as a locking fitting. A detent fitting is known, for example, from WO 2011/029522 A2. The differences between a gear fitting and a locking fitting are also described, for example, in WO 2011/029521 A2.

The object is also achieved according to the invention by a vehicle seat with a seat part, a backrest and a fitting system as described above. The seating comfort of the vehicle seat is increased because the fitting system according to the invention does not have a continuous shaft between the two fittings. The backrest is preferably connected to the seat part by means of the fitting system so that it can pivot about a backrest pivot axis. The vehicle seat is preferably a motor vehicle seat, in particular for a passenger car.

In summary and in other words, compared to the prior art, a synchronization shaft for two fittings was moved to a different position and connected to the two fittings via gear wheels, in particular to move the movement of the synchronization shaft during a rotation of the backrest. The invention can be used with gear fittings (continuous recliners) and detent fittings (discontinuous recliners). The fittings are preferably synchronized via a gear system and a lower shaft. The upper gears can each be attached to the fittings via an upper shaft and secured with washers, in particular quick fasteners. The lower gears can be inserted in holes of seat frame side parts of a backrest structure, connected to each other via the lower shaft and be secured by washers, especially quick fasteners. When an operating lever is pulled or a hand wheel is turned, a first fitting arranged adjacent to the operating lever or the hand wheel can be actuated, and an upper gear wheel can be turned, which transfers this movement to a lower gear wheel. This causes the lower gear to turn the lower shaft. The lower shaft transmits the rotary motion to the lower gear on the other side of the seat. The lower gear of this other side of the seat rotates (or unlocks) the backrest via the upper gear. When using locking fittings, the operating lever can remain stationary while the backrest is pivoted. The pivoting movement of the backrest can cause the lower gears to roll on the upper gears. The same function is used for gear fittings, which preferably use 360 degree gears.

Figures and embodiments of the invention

The invention is explained in more detail below on the basis of two advantageous exemplary embodiments illustrated in the figures. However, the invention is not limited to these exemplary embodiments. They show schematically:

1: a side view of a vehicle seat according to the invention according to a first embodiment,

2: a detail of a section through the vehicle seat from FIG. 1 along the line II-II in FIG. 1,

3: a side view of a vehicle seat according to the invention according to a second embodiment,

FIG. 4: an exploded view of a fitting system according to the invention of the vehicle seat from FIG. 3, and Fig. 5: a detail perspective view of the vehicle seat

3

FIG. 1 shows a vehicle seat 1 for a motor vehicle according to a first exemplary embodiment. The vehicle seat 1 has a seat part 3 and a backrest 4 whose inclination can be adjusted relative to the seat part 3 . A fitting system 100 according to the invention is provided for adjusting the inclination of the backrest 4 . The seat part 3 has a supporting seat part structure 30 and a cushion part supported by the seat part structure 30 . The backrest 4 has a supporting backrest structure 40 and an upholstery part supported by the backrest structure 40 .

To adjust the inclination of the backrest 4, a first shaft 112 of the fitting system 100 can be rotated about a first axis of rotation D1, for example manually by means of a flange wheel 113 or by motor, for example by means of an electric motor. The first axis of rotation D1 is preferably and in the present case aligned with a backrest pivot axis S.

A fitting 110, 120 is provided on each side of the vehicle seat 1. By means of the fittings 110, 120, the backrest 4 is connected to the seat part 3 so that it can be inclined about the backrest pivot axis S.

The first shaft 112 is arranged horizontally in a transition area between the seat part 3 and the backrest 4 . The first shaft 112 engages in a first fitting 110 of the two fittings 110, 120 in a torque-proof manner. The first shaft 112 is spaced axially from the second fitting 120 of the two fittings 110, 120.

A second shaft 122 is also arranged horizontally in the transition area between the seat part 3 and the backrest 4 . The second shaft 122 engages in the second fitting 120 in a rotationally fixed manner. The second shaft 122 is spaced axially from the first fitting 110. The second shaft 122 is aligned with the first shaft 112. The second shaft 122 is also rotatable about the first axis of rotation D1. The first shaft 112 and the second shaft 122 are spaced apart from one another in the axial direction. Because of Due to the axial distance between the shafts 112, 122, in the area of the first axis of rotation D1 between the shafts 112, 122 there is a space available, for example for further components of the vehicle seat 1 or for a vehicle occupant.

The first axis of rotation D1 defines the directional information used in a cylindrical coordinate system. In particular, the terms radial, axial, circumferential and circumferential direction are related to this cylindrical coordinate system. The first shaft 112, the second shaft 122 and the two fittings 110, 120 are components of the fitting system 100 shown in Figure 2 for adjusting the inclination of the backrest 4.

The two fittings 110, 120 are shown in highly schematic form in FIG. Each of the two fittings 110, 120, of which only the first fitting 110 is described in detail below due to the same structure, has a first fitting part 114 and a second fitting part 115, which can be rotated relative to one another. With the installation of the first fitting 110 in the vehicle seat 1, the second fitting part 115 is assigned to the backrest 4 and connected to its backrest structure 40, while the first fitting part 114 is assigned to the seat part 3 and is firmly connected to its seat part structure 30. The relative twisting of the two fitting parts 114; 115 to each other effects the inclination adjustment of the backrest 4.

The first fitting part 114 is attached to the seat part structure 30, for example by laser welding or MAG welding. The second fitting part 115 is attached to the backrest structure 40, for example by laser welding or MAG welding.

The first fitting 110 has a driver 116 which is also referred to below as the first driver 116 . The driver 116 is rotatably mounted relative to the fittings 114, 115. The driver 116 has an opening for receiving the first shaft 112 . A profile of the opening that deviates from a circular profile shape matches a profile of the first shaft 112, in this case a spline profile, is formed. The first shaft 112 and the driver 116 are preferably rotationally coupled to one another. However, an idle travel (idle angle) can be provided between the first shaft 112 and the driver 116 in the circumferential direction, so that the first shaft 112 and the driver 116 are rotationally coupled to driving only after the idle travel (idle angle) has been traversed. Such an idle travel (idle angle) serves in particular to compensate for tolerances.

The first fitting 110 (like the second fitting 120) is designed as a geared fitting, in which the first fitting part 114 and the second fitting part 115 are connected to one another by means of a gear for adjusting and fixing, more precisely by means of a - here self-locking - eccentric planetary gear, as described, for example, in WO 2011/151017 A1, the relevant disclosure content of which is expressly incorporated. To form the transmission, an externally toothed gear wheel is formed on the second fitting part 115 and an internally toothed ring gear is formed on the first fitting part 114, which mesh with one another. The diameter of the addendum circle of the external toothing of the gear wheel is smaller by at least one tooth height than the diameter of the root circle of the internal toothing of the ring gear. A corresponding difference in the number of teeth of the gear wheel and ring gear of at least one tooth enables a rolling movement of the ring gear on the gear wheel.

One of the two fitting parts 114; 115 preferably has a collar as a bearing for the driver 116. Two wedge segments, not shown in the figures, are preferably supported on the collar (with their curved inner surfaces), which (with their curved outer surfaces and preferably by means of a plain bearing bush) hold the other of the two fitting parts 114; 115 store. The driver 116 has a driver segment that engages with play between the narrow sides of the wedge segments. The mutually facing broad sides of the wedge segments each receive an end finger of a spring, which pushes the wedge segments apart in the circumferential direction. An eccentric is defined by the wedge segments and the spring, which, in extension of the direction of an eccentricity, presses the gear wheel into the ring gear at an engagement point. When driven by the first shaft 112 rotating (in particular multiple times) about the first axis of rotation D1, a torque is first transmitted to the driver 116, which rotates with the first shaft 112, and is transmitted by means of the driver segment of the driver 116 to the eccentric, which under displacement the direction of the eccentricity and thus shifting the point of engagement of the gear wheel in the ring gear. The shift in the direction of the eccentricity causes a wobbling rolling motion between the gear wheel and the ring gear, that is, a relative rotation with a superimposed wobbling motion.

The interaction of the second shaft 122 with the second fitting 120 corresponds to the above-described interaction of the first shaft 112 with the first fitting 110. Like the first fitting 110, the second fitting 120 also has a first fitting part 124, a second fitting part 125 and a driver 126 on, which is also referred to below as the second driver 126, the designation of the second driver 126 merely being used to distinguish it from the first driver 116 and does not mean that the second fitting 120 has two drivers 126.

Optionally, a third fitting part (not shown in the figures) can be provided, which on the one hand is firmly connected to the backrest structure 40 and on the other hand is pivotably mounted relative to the second fitting part 115 associated with the backrest 4 and is releasably locked to it. This design allows the backrest 4 to pivot freely to facilitate access to a rear row of seats, without the set inclination of the backrest 4 being changed.

The inclination of the backrest 4 is infinitely adjustable by this drive of the fittings 110, 120 between several positions of use. A rotation of the Flandrad 113 causes a rotation of the first shaft 112 and thus an adjustment of the first fitting 110 in the manner described above Neither the handwheel 113 nor the first shaft 112 are directly connected to the second shaft 122, the second shaft 122 must be driven synchronously with the first shaft 112 in order to adjust the second fitting 120. The components of fitting system 100 described below, in particular gear wheels 117, 127, 141, 142 and a third shaft 140, are used for this purpose.

A first gear 117, in particular a spur gear, is connected to the first shaft 112 in a rotationally fixed manner. A second gear 127, in particular a spur gear, is connected to the second shaft 122 in a rotationally test manner. Preferably, the first gear 117 and the second gear 127 have the same number of teeth. A quick fastener 118 is provided in each case for axially securing the first gear wheel 117 on the first shaft 112 and the second gear wheel 127 on the second shaft 122 .

A third gear 141, in particular a spur gear, and a fourth gear 142, in particular a spur gear, are non-rotatably connected to the third shaft 140. The third gear 141, the fourth gear 142 and the third shaft 140 are rotatable together about a second axis of rotation D2. The third gear 141 and the fourth gear 142 preferably have the same number of teeth. The second axis of rotation D2 runs parallel to the first axis of rotation D1. The second axis of rotation D2 runs at a radial distance A from the first axis of rotation D1. In the present case, the second axis of rotation D2 runs below the first axis of rotation D1. A quick fastener 128 is provided for axially securing the third gear wheel 141 in particular on the third shaft 140 .

The third gear wheel 141 and the fourth gear wheel 142 are mounted on the backrest structure 40 so as to be rotatable about the second axis of rotation D2. For this purpose, the third gear wheel 141 and the fourth gear wheel 142 each have a circumferential groove which is attached to a respective collar of the backrest structure 40 .

The third gear 141 meshes with the first gear 117. The fourth gear 142 meshes with the second gear 127. Turning the hand wheel 113 rotates the first shaft 112 about the first axis of rotation D1 and the first fitting 110 is adjusted. At the same time, due to the rotation of the first shaft 112 also the first gear 117 about the first axis of rotation D1. The first gear wheel 117 and the third gear wheel 141 roll off one another, so that the third gear wheel 141 rotates about the second axis of rotation D2, as a result of which the fourth gear wheel 142 also rotates correspondingly about the second axis of rotation D2. The fourth gear 142 and the second gear 127 roll off one another, so that the second shaft 122 rotates and the second fitting 120 is adjusted synchronously with the first fitting 110 .

Depending on the design of the (gear) fittings 110, 120, the wobbling movement described above can lead to the first axis of rotation D1 (the first shaft 112 and the second shaft 122) having a wobbling movement relative to the second axis of rotation D2 (to the third shaft 140). executes This wobbling movement can be compensated for by the gear wheels 117, 127, 141, 142 being designed to be out of round, as is known, for example, from WO 2005/023579 A1, the relevant disclosure content of which is expressly included.

FIG. 3 shows a vehicle seat 1 for a motor vehicle according to a second exemplary embodiment. The vehicle seat 1 also has a seat part 3 and a backrest 4 whose inclination can be adjusted relative to the seat part 3 . To adjust the inclination of the backrest 4, a fitting system 200 according to the invention, shown in FIGS. 4 and 5, is provided according to a second exemplary embodiment. Since the vehicle seat 1 corresponds to the vehicle seat 1 of the first exemplary embodiment, except for the fitting system 200, the same reference numbers are used to a large extent. Solely to describe the fitting system 200 of the second exemplary embodiment, reference numbers that are one hundred higher than the fitting system 100 of the first exemplary embodiment are used. Unless otherwise described, the second fitting system 200 corresponds to the first fitting system 100 in terms of structure and function.

The fitting system 200 of the second exemplary embodiment essentially differs from the fitting system 100 of the first exemplary embodiment in that the two fittings 210, 220 are designed as locking fittings, each of which has a first fitting part 214, 224 and a second fitting part 215, 225 can be locked together, as is described, for example, in WO 2011/029522 A2, the relevant disclosure content of which is expressly included.

Because the two fittings 210, 220 have the same structure, only the first fitting 210 is described in detail below. A second fitting part 215 has guide segments which, in pairs, each guide a bolt in the radial direction with straight guide surfaces. At their radially outer end, the bolts are provided with teeth which can engage (engage) with a toothed rim of the first fitting part 214 designed as a floating wheel. The fitting 210 is locked when the ring gear on the one hand and the bolts on the other hand mesh with one another. The guide segments each have a curved bearing surface on the toothed ring of the first fitting part 214, as a result of which the two fitting parts 214, 215 are rotatably supported on one another. An eccentric, which is arranged in the installation space defined between the fitting parts 214 , 215 , is seated on a driver 216 in a rotationally fixed manner or at least coupled for driving.

A spring arrangement acts on the eccentric, which acts on the radially movable bolt and acts on them so that they are pressed radially outwards in order to fall into the ring gear. A control disc, which is preferably non-rotatably seated on the eccentric or on the driver 216, interacts with the bolts in order to counteract the force of the spring arrangement when the driver 216 (and the eccentric driven by it and the control disc) rotates (by a few angular degrees). To pull bolt from the ring gear radially inwards, whereby the fitting 210 is unlocked and the two fitting parts 214, 215 are rotatable relative to each other. The inclination of the backrest 4 can thus be adjusted between several positions of use suitable for seat use.

The driver 216 is rotatably mounted relative to the fittings 214, 215. The driver 216 has an opening for receiving the first shaft 212 . A profile of the opening, which deviates from a circular profile shape, is designed to match a profile of the first shaft 212, in this case a splined shaft profile. the first shaft 212 and driver 216 are preferably rotationally coupled to one another. However, an idle travel (idle angle) can be provided between the first shaft 212 and the driver 216 in the circumferential direction, so that the first shaft 212 and the driver 216 are rotationally coupled to driving only after the idle travel (idle angle) has been traversed. Such an idle travel (idle angle) serves in particular to compensate for tolerances.

To adjust the inclination of the backrest 4, the first shaft 212 of the fitting system 200 is rotated by a few angular degrees about a first axis of rotation D1, for example manually using an operating lever 213, or electrically, for example using an actuator. The first axis of rotation D1 is preferably and in the present case aligned with a backrest pivot axis S.

A first gear 217, in particular a spur gear, is connected to the first shaft 212 in a rotationally fixed manner. A second gear 227, in particular a spur gear, is connected to a second shaft 222 for rotation therewith. Preferably, the first gear 217 and the second gear 227 have the same number of teeth. A quick fastener 218 is provided in each case for axially securing the first gear wheel 217 on the first shaft 212 and the second gear wheel 227 on the second shaft 222 .

A third gear 241, in particular a spur gear, and a fourth gear 242, in particular a spur gear, are non-rotatably connected to the third shaft 240. The third gear 241, the fourth gear 242 and the third shaft 240 are rotatable together about a second axis of rotation D2. The third gear 241 and the fourth gear 242 preferably have the same number of teeth. The second axis of rotation D2 runs parallel to the first axis of rotation D1. The second axis of rotation D2 runs at a distance A from the first axis of rotation D1. In the present case, the second axis of rotation D2 runs below the first axis of rotation D1. A quick fastener 228 is provided for axially securing the third gear wheel 241 on the third shaft 240 .

The third gear wheel 241 and the fourth gear wheel 242 are mounted on the backrest structure 40 so as to be rotatable about the second axis of rotation D2. The third gear 241 meshes with the first gear 217. The fourth gear 242 meshes with the second gear 227. By pivoting the operating lever 213, the first shaft 212 pivots about the first axis of rotation D1 and the first fitting 210 unlocks. At the same time, as a result of the pivoting movement of the first shaft 212, the first gear wheel 217 also pivots about the first axis of rotation D1. The first gear wheel 217 and the third gear wheel 241 roll off one another, so that the third gear wheel 241 is pivoted about the second axis of rotation D2, as a result of which the fourth gear wheel 242 also pivots correspondingly about the second axis of rotation D2. The fourth gear 242 and the second gear 227 roll off one another so that the second shaft 222 pivots and the second bracket 220 is unlocked synchronously with the first bracket 210 .

The gear wheels 217, 227, 241 and 242 are designed only as gear wheel segments in the present exemplary embodiment, since only a limited pivoting angle, significantly less than 360 degrees, is required to unlock the fittings 210, 220. In

Modifications of the second exemplary embodiment, however, the corresponding gear wheels can also be toothed circumferentially.

The features disclosed in the above description, the claims and the figures can be important both individually and in combination for the implementation of the invention in its various configurations, insofar as they remain within the scope of the claims.

List of reference signs vehicle seat seat part backrest seat part structure backrest structure fitting system first fitting first shaft handwheel first fitting part second fitting part driver first gear quick fastener second fitting second shaft first fitting part second fitting part driver second gear quick fastener third shaft third gear fourth gear fitting system first fitting first shaft operating lever 214 first fitting part

215 second fitting part

216 drivers

217 first gear

218 quick fasteners

220 second fitting

222 second wave

224 first fitting part

225 second fitting part

226 drivers

227 second gear

228 quick fasteners

240 third wave

241 third gear

242 fourth gear

A distance

D1 first axis of rotation

D2 second axis of rotation

S backrest swivel axis

Claims

patent claims

1. Fitting system (100; 200) for a vehicle seat (1), the fitting system (100; 200) having a) a first fitting (110; 210) with a first driver (116; 216), b) a second fitting (120 ; 220) with a second driver (126; 226), c) a first shaft (112; 212) non-rotatably connected to the first driver (116; 216), optionally after passing through an idle angle, wherein the first shaft (112; 212 ) is rotatable or pivotable about a first axis of rotation (D1), d) a second shaft non-rotatably connected to the second carrier (126; 226), optionally after passing through an idle angle

(122; 222), wherein the second shaft (122; 222) can be rotated or pivoted about the first axis of rotation (D1), characterized in that the first shaft (112; 212) is connected to the second shaft (122; 222 ) connected is.

2. Fitting system (100; 200) according to claim 1, characterized in that the transmission has a third shaft (140; 240), the third shaft (140; 240) being rotatable or pivotable about a second axis of rotation (D2).

3. Fitting system (100; 200) according to claim 1 or 2, characterized in that the second axis of rotation (D2) is arranged parallel and at a distance (A) from the first axis of rotation (D1).

4. Fitting system (100; 200) according to claim 3, characterized in that the second axis of rotation (D2) is arranged below the first axis of rotation (D1).

5. Fitting system (100; 200) according to any one of claims 1 to 4, characterized in that a first gear (117; 217) with the first shaft

(112; 212) is rotationally connected, a second gear (127; 227) is rotationally connected to the second shaft (122; 222), a third gear (141; 241) is rotationally connected to the third shaft (140; 240). , and a fourth gear (142;

242) is rotationally connected to the third shaft (140; 240).

6. Fitting system (100; 200) according to claim 5, characterized in that the first gear (117; 217) with the third gear (141; 241) is in meshing engagement.

7. Fitting system (100; 200) according to claim 6, characterized in that the second gear (127; 227) with the fourth gear (142; 242) is in meshing engagement.

8. Fitting system (100; 200) according to one of claims 1 to 7, characterized in that a handwheel (113) or an operating lever (213) is provided for rotating or pivoting the first shaft (112; 212).

9. Fitting system (100; 200) according to claim 8, characterized in that the first shaft (112; 212) is non-rotatably connected to the hand wheel (113) or to the operating lever (213).

10. fitting system (100) according to any one of claims 1 to 9, characterized in that the first fitting (110) is designed as a gear fitting.

11. fitting system (100) according to any one of claims 1 to 10, characterized in that the second fitting (120) is designed as a gear fitting.

12. Fitting system (200) according to any one of claims 1 to 9, characterized in that the first fitting (210) and the second fitting (220) are each designed as a locking fitting.

13. Vehicle seat (1) with a seat part (3), a backrest (4) and a fitting system (100; 200) according to one of claims 1 to 12.

14. Vehicle seat (1) according to claim 13, characterized in that the backrest (4) by means of the fitting system (100; 200) is connected to the seat part (3) so that it can pivot about a backrest pivot axis (S).

15. Vehicle seat (1) according to claim 13 or 14, wherein the vehicle seat (1) is a motor vehicle seat.