JOINT FITTING FOR A VEHICLE SEAT AS WELL AS VEHICLE SEAT

Abstract

The invention relates to a hinge fitting (100) for a vehicle seat (10), comprising a first fitting part (110) with a first toothed ring (112), a second fitting part (120) with a second toothed ring (122), wherein the first fitting part (110) and the second fitting part (120) are rotatably mounted relative to each other about a pivot axis (A), a gear (130) for generating a rotary movement between the first toothed ring (112) and the second toothed ring (122), and an eccentric (150) for driving a rotating motion of the gear (130) on the two toothed rings (112, 122), the eccentric (150) comprising a first wedge system (152) with two first wedge segments (154) and a second wedge system (182) with two second wedge segments (184). The first two wedge segments (154) are each supported radially inwards on the gear (130) and radially outwards on the first fitting part (110).The two second wedge segments (184) are each supported radially outwards on the gear (130) and radially inwards on the second fitting part (120). The invention also relates to a vehicle seat (10).

Description

[0001] The invention relates to a hinge fitting for a vehicle seat, in particular a motor vehicle seat, comprising a first fitting part with a first toothed ring, a second fitting part with a second toothed ring, wherein the first fitting part and the second fitting part are rotatably mounted relative to each other about an axis of rotation, a gear meshing with the first toothed ring and the second toothed ring for generating a rotary motion between the first toothed ring and the second toothed ring, and an eccentric for driving a rotating motion of the gear on the two toothed rings to generate the rotary motion between the first toothed ring and the second toothed ring. The invention also relates to a vehicle seat. State of the art

[0002] EP 1 647 438 B1 discloses a gear fitting for a vehicle seat comprising a first ring gear, an eccentric rotatable about an axis of rotation, a pinion driven by the eccentric and meshing with the first ring gear, and a second ring gear meshed by the pinion and mounted on the first ring gear. A keyway system, axially offset from the eccentric with respect to the axis of rotation, is provided to compensate for backlash between one of the ring gears and the other ring gear and / or the pinion.

[0003] From WO 2020 / 229354 A1, a hinge fitting for a vehicle seat is known, comprising a first fitting part with a first toothed ring, a second fitting part with a second toothed ring, wherein the second fitting part is rotatable about an axis of rotation relative to the first toothed ring, a gear rotating in the first toothed ring and in the second toothed ring for generating a rotary motion between the first toothed ring and the second toothed ring, and an eccentric arranged between the first fitting part and the gear for driving a rotary motion of the gear in the first toothed ring. The eccentric has two wedge segments and a spring that pushes the wedge segments apart. Between the second fitting part and the gear, a further eccentric is arranged to eliminate backlash between the gear and the second toothed ring. The further eccentric also has two wedge segments. Task

[0004] The invention is based on the objective of improving a hinge fitting of the type mentioned above, in particular increasing the load-bearing capacity of the hinge fitting in an overload situation, and providing a corresponding vehicle seat. An overload is understood to be a force acting on the hinge fitting (and a torque resulting therefrom) that is greater than any force that can occur during the intended use of the fitting / vehicle seat. An overload on the hinge fitting occurs particularly in an accident involving the vehicle in which the vehicle seat is installed. A frontal crash can be an example of such an overload situation. Furthermore, the invention is based on the objective of providing optimized backlash compensation between the gear and the first gear ring, as well as between the gear and the second gear ring. Solution

[0005] This problem is solved by a hinge fitting for a vehicle seat, in particular a motor vehicle seat, the hinge fitting comprising a first fitting part with a first toothed ring, a second fitting part with a second toothed ring, wherein the first fitting part and the second fitting part are rotatably mounted relative to each other about an axis of rotation, a gear meshing with the first toothed ring and with the second toothed ring for generating a rotary motion between the first toothed ring and the second toothed ring, and an eccentric for driving a rotating motion of the gear on the two toothed rings to generate the rotary motion between the first toothed ring and the second toothed ring, the eccentric comprising a first wedge system with two first wedge segments, wherein the two first wedge segments are each supported radially inwards on the gear.and the two first wedge segments are each supported radially outwards on the first fitting part, and a second wedge system with two second wedge segments, wherein the two second wedge segments are each supported radially outwards on the gear, and the two second wedge segments are each supported radially inwards on the second fitting part.

[0006] Because the eccentric features a first wedge system with two wedge segments and a second wedge system with two wedge segments, with the first two wedge segments each supported radially inwards on the gear, the first two wedge segments each supported radially outwards on the first fitting part, the second two wedge segments each supported radially outwards on the gear, and the second two wedge segments each supported radially inwards on the second fitting part, the load-bearing capacity of the hinge fitting in an overload situation is increased compared to the prior art. The overload is distributed across both wedge systems. Deformations of the fitting, which can lead to reduced tooth contact, are significantly reduced compared to systems in which only one wedge system is loaded.In addition, the first wedge system ensures that the gear and the first fitting part are free of play relative to each other, and the second wedge system ensures that the gear and the second fitting part are free of play relative to each other, so that the joint fitting as a whole is largely free of play.

[0007] The gear is continuously engaged with both the first and second gear rings. This distinguishes the joint mechanism from releaseable detent fittings, where the teeth can be disengaged for unlocking.

[0008] The first two wedge segments can each be supported radially inwards on a shaft section of the gear. The shaft section can be concentric to the axis of rotation. The shaft section can be a sheet metal through-section. The shaft section can be a collared section. The gear and the shaft section can be made of sheet metal, in particular sheet steel. The shaft section can have two ends. One end of the shaft section can be located on a disc-shaped area of ​​the gear. A free end of the shaft section can point away from the second fitting part. A free end of the shaft section can point away from the disc-shaped area of ​​the gear.

[0009] The first two wedge segments can each be supported radially outwards in a central opening of the first fitting part. The central opening of the first fitting part can be concentric with the axis of rotation. The central opening of the first fitting part can be lined with a sliding bearing bushing, particularly to reduce friction. The first two wedge segments can be supported in the sliding bearing bushing. The sliding bearing bushing can be pressed into the central opening of the first fitting part. The sliding bearing bushing can also at least partially line the shaft section of the gear on the inside. The sliding bearing bushing can be hardened. By supporting the first wedge segments in the sliding bearing bushing, the load-bearing capacity is improved and wear is reduced during high-speed operation.

[0010] The two second wedge segments can each be supported radially outwards in a central opening of the gear. The central opening of the gear can be concentric with the axis of rotation. The central opening of the gear can be lined with a plain bearing bushing, particularly to reduce friction. The two second wedge segments can be mounted in a plain bearing bushing. The plain bearing bushing can be pressed into the central opening of the gear. The plain bearing bushing can be hardened. By mounting or supporting the second wedge segments in the plain bearing bushing, the load-bearing capacity is improved and wear is reduced during high-speed operation.

[0011] The two second wedge segments can each be supported radially inwards on a support section of the second fitting part. The support section of the second fitting part can be concentric to the axis of rotation. The support section can be a sheet metal through-section. The support section can be a collar section. The second fitting part and the support section can be made of sheet metal, in particular sheet steel. The support section can have two ends. One end of the support section can be arranged on a disc-shaped area of ​​the second fitting part. A free end of the support section can point away from the second fitting part. A free end of the support section can point away from the disc-shaped area of ​​the second fitting part.

[0012] The two wedge systems can have unequal, in particular opposite, eccentricities to the axis of rotation. The first and second wedge systems can be arranged opposite each other with respect to the axis of rotation. The first and second wedge systems can be arranged diametrically opposite each other with respect to the axis of rotation. The first and second wedge systems can be arranged rotated relative to each other about the axis of rotation. The first and second wedge systems can be arranged rotated 180 degrees relative to each other about the axis of rotation. This allows high radial loads in the hinge fitting to be optimally supported even in opposite directions.

[0013] The eccentric can, in particular directly, serve to drive the rotational movement of the gear in the first gear ring and to drive the rotational movement of the gear in the second gear ring. The eccentric can be driven by means of a driver mounted rotatably about the axis of rotation. The driver can have a first driver segment and a second driver segment. The first driver segment and the second driver segment can be rigidly connected to each other. The first driver segment can be arranged circumferentially between the narrow sides of the two first wedge segments. The second driver segment can be arranged circumferentially between the narrow sides of the two second wedge segments.

[0014] The drive element can have a drive hub and a drive ring that is non-rotatably connected to the drive hub. The drive element can have exactly one drive hub and exactly one drive ring that is non-rotatably connected to the drive hub. The drive ring can have the first drive segment and the second drive segment.

[0015] The two wedge systems provide radial support for the gear against the first and second fitting parts when an overload is applied to the joint fitting. This ensures that the teeth of the gear and the two fitting parts remain engaged even under very high overload conditions.

[0016] The two gear rings can have different numbers of teeth. By selecting the difference in the number of teeth, the reduction ratio between the two fitting parts, or between the gear on the one hand and the fitting parts on the other, can be set. The difference in the number of teeth between the two gear rings can be exactly one. The gear preferably has fewer teeth than either of the two gear rings. The difference between the number of teeth on the gear and the number of teeth on either of the two gear rings can be exactly one. However, the difference in the number of teeth between the gear and the two gear rings can also be greater than one. For example, the first gear ring has twenty-nine teeth, the second gear ring has twenty-eight teeth, and the gear has twenty-seven teeth.

[0017] In a variation of the embodiment, the gear, preferably a single piece, has two axially adjacent gear discs that are non-rotatably connected to each other. One gear disc meshes with a first ring of teeth, and the other with a second ring of teeth. The two gear discs have different numbers of teeth. The two ring of teeth can then have either different or the same number of teeth.

[0018] The gear can be equipped with teeth common to both gear rings, which are identical for both. Alternatively, the gear can be formed from two different, rigidly connected gear discs with different numbers of teeth, where one gear disc meshes with the first gear ring and the other gear disc meshes with the second gear ring.

[0019] The first wedge system can include a spring that pushes the first two wedge segments apart. Because the spring pushes the first two wedge segments apart, the gear meshes radially with the first gear ring without backlash. The second wedge system can include a spring that pushes the second two wedge segments apart. Because the spring pushes the second two wedge segments apart, the gear meshes radially with the second gear ring without backlash.

[0020] The second fitting component can be rotatably mounted on the first fitting component. The second fitting component can also be rotatably mounted within the first fitting component. The two fitting components can be axially fixed to each other by means of a clamping ring. However, the two fitting components then have limited radial movement relative to each other to allow for radial play compensation by the eccentrics.

[0021] The problem is further solved by a vehicle seat with at least one joint fitting according to the invention. For example, the vehicle seat has a seat section and a backrest, which is adjustable about a pivot axis and connected to the seat section by means of the at least one joint fitting. By using the joint fitting according to the invention, higher forces can be transferred from the backrest to the seat section of the vehicle seat via the joint fittings according to the invention.

[0022] In summary, and in other words, the invention provides an optimized hinge fitting comprising a first fitting part having a first toothed ring, a second fitting part having a second toothed ring, and a gear in which the gear rotates within the first and second toothed rings to generate a rotary motion about an axis of rotation between the first and second toothed rings. The gear rolls eccentrically to the axis of rotation within the toothed rings. The first toothed ring is fixedly connected to the first fitting part. The second toothed ring is fixedly connected to the second fitting part. The second fitting part can be rotatably mounted in the first fitting part. A clamping ring can axially secure the second fitting part to the first fitting part. The clamping ring can be welded to the first fitting part. The clamping ring can radially overlap the second fitting part.The second fitting part can then be rotated relative to the clamping ring.

[0023] An eccentric mechanism acts between the first fitting part and the gear, and between the second fitting part and the gear, to drive a rotary motion (rolling motion) of the gear within the first gear ring. Adjusting the eccentric mechanism causes a concentric movement of the first gear ring relative to the second gear ring. The eccentric may have two first wedge segments and a spring that pushes the two first wedge segments apart, or two second wedge segments and a spring that pushes the two second wedge segments apart. In a non-driven state, the eccentric can, particularly through a wedge action, block the rotary motion of the gear within the first and second gear rings. The eccentric may be driven by a drive gear rotating about the axis of rotation, which preferably has a drive hub and two drive arms that engage between the wedge segments.The drive arms can be non-rotatably connected to the drive hub. A rotational movement of the drive hub about the axis of rotation can be transmitted via the drive arms to the wedge segments, whereby the wedge segments drive an eccentric rotational movement of the gear, which in turn drives a rotational movement of the two fitting parts relative to each other about the axis of rotation. The drive can be axially pre-tensioned by a spring, in particular a wave spring washer.

[0024] The first fitting can be fixedly connected, for example, to a seat section of a vehicle seat. The second fitting is pivotable relative to the first fitting, particularly to a seat section of a vehicle seat. The second fitting can be fixedly connected to a backrest of the vehicle seat, allowing the backrest's tilt angle to be adjusted by pivoting between the first and second fittings. The hinge fitting can be a planetary gear system. The gear can be a planetary gear.

[0025] In other applications, the fitting can be used as a height adjuster, seat tilt adjuster, calf support tilt adjuster or shoulder support fitting. Figures and embodiments of the invention

[0026] The invention is explained in more detail below with reference to an advantageous embodiment illustrated in the figures. However, the invention is not limited to this embodiment. The figures schematically show: Fig. 1: A highly abstracted side view of a vehicle seat according to the invention with a hinge fitting according to the invention, Fig. 2: a first wedge system of the hinge fitting according to the invention, and Fig. 3: a section through the joint fitting according to the invention.

[0027] Fig. Figure 1 shows a vehicle seat 10 according to the invention for a motor vehicle, comprising a hinge fitting 100 according to the invention. The vehicle seat 10 has a seat section 12 and a backrest 14 whose inclination is adjustable relative to the seat section 12. To adjust the inclination of the backrest 14, a drive shaft 18 is rotated about a pivot axis A, either manually by means of a handwheel 16 or alternatively by means of an electric motor. The drive shaft 18 is arranged horizontally in a transition area between the seat section 12 and the backrest 14. On both sides of the vehicle seat 10, the drive shaft 18 engages in a hinge fitting 100 according to the invention in a rotationally fixed manner.

[0028] Fig.Figure 3 shows a section through the hinge fitting 100 according to the invention. The hinge fitting 100 has a first fitting part 110 and a second fitting part 120. The second fitting part 120 is rotatably mounted in the first fitting part 110 about the axis of rotation A. The directional terms used below, such as central, axial, radial, and circumferential, refer to the axis of rotation A, unless otherwise specified. Radial means perpendicular to the axis of rotation A. Axial means in the direction of or parallel to the axis of rotation A. The drive shaft 18 is rotatable about the axis of rotation A.

[0029] The second fitting 120 is rotatably mounted in the first fitting 110. For this purpose, an outer edge region of the first fitting 110 engages an outer edge region of the second fitting 120. A clamping ring 140 axially secures the second fitting 120 to the first fitting 110.

[0030] The first fitting 110 is fixedly connected to a backrest structure of the backrest 14, in particular by welding. The second fitting 120 is fixedly connected to a seat base structure of the seat section 12, in particular by welding. In an alternative embodiment, the first fitting 110 can be fixedly connected to the seat section 12 and the second fitting 120 can be fixedly connected to the backrest 14, in particular by welding.

[0031] The first fitting 110 has a first gear ring 112. The first fitting 110 is designed as a ring gear. The axis of rotation A coincides with a central axis of the first gear ring 112. The first gear ring 112 is coaxial with the axis of rotation A. A sliding bearing bushing 114 is centrally attached to the first fitting 110, preferably pressed into a central opening of the first fitting 110. The first gear ring 112 is coaxial with the axis of rotation A.

[0032] The second fitting 120 has a second gear ring 122. The second fitting 120 is designed as a ring gear. The axis of rotation A coincides with a central axis of the second gear ring 122. The second gear ring 122 is coaxial with the axis of rotation A. The second gear ring 122 is coaxial with the first gear ring 112.

[0033] A gear 130 drives the rotational movement of the second fitting 120 relative to the first fitting 110 about the axis of rotation A. The gear 130 is designed as an external gear. It meshes with the internally toothed first gear 112 and the internally toothed second gear 122. The external teeth of the gear 130 mesh with the internal teeth of the gear 112 and 122. The gear 130 and the gear 112 and 122 are designed such that the gear 130 can rotate (roll) within the gear 112 and 122 as a planetary gear. The two gear 112 and 122 have a different number of teeth, specifically a difference of one. The gear 130 has fewer teeth than either of the two gear rings 112; 122. The difference in the number of teeth between the gear 130 and either of the two gear rings 112; 122 can be exactly one.For example, the first gear ring can have 112 twenty-nine teeth, the second gear ring 122 twenty-eight teeth, and the gear 130 twenty-seven teeth.

[0034] The gear 130 has a shaft section 132, in particular a collar, which projects axially on one side beyond the teeth of the gear 130. The shaft section 132 is concentric with the teeth of the gear 130. The shaft section 132 and the teeth of the gear 130 are concentric with a gear center axis Z.

[0035] A first wedge system 152 comprises two first wedge segments 154 and a spring 156. Each of the two first wedge segments 154 has a curved inner surface and a curved outer surface. The curved inner surfaces of the two first wedge segments 154 are supported on the shaft section 132 of the gear 130. The curved outer surfaces of the two first wedge segments 154 are supported in the first fitting 110. The outer surfaces of the two first wedge segments 154 bear against the pressed-in sliding bearing bushing 114 of the first fitting 110.

[0036] Each first wedge segment 154 has a surface extending approximately radially, hereinafter referred to as the broad side. A circumferentially opposite end of each first wedge segment 154 has a surface also extending approximately radially, hereinafter referred to as the narrow side. The broad side is larger radially than the narrow side.

[0037] The first two wedge segments 154, whose broad sides face each other, each receive an angled end finger of a pre-tensioned and, for example, omega-shaped spring 156. This spring 156 acts on the first wedge segments 154 in a circumferential direction to push them apart, whereby, during the adjustment of the hinge fitting 100, the broad sides of the first wedge segments 154 can touch and act upon each other.

[0038] The second fitting part 120 has a support section 124, in particular a collar, which projects towards the first fitting part 110. The support section 124 is coaxial with the axis of rotation A.

[0039] A second wedge system 182 comprises two second wedge segments 184 and a spring 186. Each of the two second wedge segments 184 has a curved inner surface and a curved outer surface. The curved inner surfaces of the two second wedge segments 184 are supported on the support section 124 of the first fitting part 110. The curved outer surfaces of the two second wedge segments 184 support the gear 130. The outer surfaces of the second wedge segments 184 bear against a pressed-in sliding bearing bushing 134 of the gear 130. The terms "support," "bear," and "bearing" are not intended to be limited to a specific direction of force flow through the joint fitting 100, as this direction depends in particular on the installation of the joint fitting 100 in the vehicle seat 10.

[0040] The first end of each second wedge segment 184 has a surface extending approximately in the radial direction, hereinafter referred to as the broad side. The end of each second wedge segment 184 opposite the broad side in the circumferential direction has a surface also extending approximately in the radial direction, hereinafter referred to as the narrow side. The broad side is larger in the radial direction than the narrow side.

[0041] The second wedge segments 184, whose broad sides face each other, each receive an angled end finger of a pre-tensioned and, for example, omega-shaped spring 186. This spring 186 acts on the second wedge segments 184 in the circumferential direction to push them apart, whereby, during the adjustment of the hinge fitting 100, the broad sides of the second wedge segments 184 can touch and act upon each other.

[0042] As previously described, the drive shaft 18 is rotatable about the axis of rotation A to adjust the tilt angle of the backrest 14 about the axis of rotation A. A driver 160 of the joint fitting 100 serves to transmit the rotational movement of the drive shaft 18 to an eccentric 150 having the two wedge systems 152, 182. The driver 160 has a driver hub 162 and a driver ring 164 that is non-rotatably connected to the driver hub 162. In this case, the driver 160 is designed in two parts, with the driver hub 162 and the driver ring 164 being separately formed components that are non-rotatably connected to each other, in particular by means of a splined connection. The driver 160 is preferably made of plastic.

[0043] The drive ring 164 has a first drive segment 166 and a second drive segment 167. The first drive segment 166 is arranged (with clearance in the circumferential direction) between the narrow sides of the first wedge segments 154. Radially, the first drive segment 166 is arranged between the shaft section 132 of the gear 130 and the sliding bearing bushing 114 of the first fitting part 110. The second drive segment 167 is arranged (with clearance in the circumferential direction) between the narrow sides of the second wedge segments 184. Radially, the second drive segment 167 is arranged between the support section 124 of the first fitting part 110 and the sliding bearing bushing 134 of the first gear 130. Both drive segments 166 and 167 preferably have the form of a hollow cylindrical segment.

[0044] The eccentric 150 is formed by the two wedge systems 152, 182 and the drive segments 166, 167. The eccentric 150 has an approximately circular outer contour, which is offset by an eccentricity e from the axis of rotation A. At a point of engagement E, the eccentric 150 forces the teeth of the gear 130 to their maximum depth into the teeth of the first gear ring 112 and into the teeth of the second gear ring 122 in the direction of the eccentricity e. The depth of engagement decreases circumferentially on both sides of the point of engagement E. In a region radially opposite the point of engagement E, the teeth of the gear 130 on the one hand and the teeth of the gear rings 112, 122 on the other hand are completely disengaged and have the greatest possible distance from each other.

[0045] The drive hub 162 of the driver 160 is rotatably mounted about the axis of rotation A, preferably in a central opening of the second fitting part 120. The drive hub 162 is centrally provided with a bore 168 for the rotationally fixed reception of the drive shaft 18. The profile of the bore 168 is complementary to a profile of the drive shaft 18, in this case a splined shaft profile.

[0046] The driver 160 has a cover plate 170 at one end of the driver hub 162, facing away from the second fitting part 120. An outer edge region of the cover plate 170 is larger than the diameter of the sliding bearing bushing 114 and rests against the first fitting part 110. The cover plate 170 protects the interior of the hinge fitting 100 from contamination. The driver 160 is axially secured on the outside of the second fitting part 120 by a retaining ring 174, preferably clipped on. A wave spring washer 176 is arranged between the retaining ring 174 and the second fitting part 120 and pre-tensions the driver 160 in the axial direction, particularly to prevent rattling noises caused by tolerances.

[0047] When driven by the drive shaft 18, which rotates (multiple times) around the axis of rotation A, a torque is first transmitted to the driver 160 and then, via the driver segments 166, 167, to the wedge systems 152, 182 of the eccentric 150, as described in more detail below. The eccentric 150 rotates relative to the two fitting parts 110, 120, causing a shift in the direction of the eccentricity e and thus a rotational displacement of the point of engagement E, resulting in a wobbling rotational motion of the gear 130 in the gear rings 112, 122. The eccentric 150 also rotates relative to the gear 130.

[0048] Due to the previously described differences in the number of teeth of gear 130, first gear ring 112, and second gear ring 122, the wobbling rotation of gear 130 generates a relative rotation between the teeth of first gear ring 112 and second gear ring 122, and thus a relative rotation between the first fitting part 110 and the second fitting part 120. The inclination of the backrest 14 is therefore continuously adjustable between several operating positions.

[0049] Due to the previously described arrangement of the two wedge systems 152, 182, the eccentric 150 can largely reduce deformations of the fitting components 110, 120 and play. In the event of an overload acting on the hinge fitting 100, particularly an overload torque acting about the axis of rotation A, the second wedge system 182 provides radial support between the gear 130 and the second fitting component 120. This ensures that, in the event of an overload, the tooth engagement between the second gear 122 and the gear 130 is maintained for a longer period, resulting in a higher maximum transmissible torque and thus greater strength of the hinge fitting 100. Reference symbol list 10 vehicle seats 12 Seat section 14 Backrest 16 Handwheel 18 Drive shaft 100 joint fittings 110 first fitting part 112 first gear ring 114 Plain bearing bushing 120 second fitting part 122 second gear ring 124 Support section (of the second fitting part 120) 130 gear 132 Shaft section (of gear 130) 134 Plain bearing bushing 140 clamping ring 150 eccentrics 152 first wedge system 154 first wedge segment 156 spring 160 carriers 162 Drive hub 164 Drive ring 166 first drive segment 167 second drive segment 168 bore 170 Cover plate 174 retaining ring 176 Wave spring washer 182 second wedge system 184 second wedge segment 186 spring A axis of rotation eccentricity E Intervention site Z gear center axis

Claims

[1] Articulated fitting (100) for a vehicle seat (10), in particular a motor vehicle seat, comprising an articulated fitting (100) - a first fitting part (110) with a first toothed ring (112), - a second fitting part (120) with a second toothed ring (122), wherein the first fitting part (110) and the second fitting part (120) are rotatably mounted relative to each other about a pivot axis (A), - a gear (130) in mesh with the first gear ring (112) and with the second gear ring (122) to generate a rotary motion between the first gear ring (112) and the second gear ring (122), and - an eccentric (150) for driving a rotating motion of the gear (130) on the two gear rings (112, 122) to generate the rotary motion between the first gear ring (112) and the second gear ring (122), exhibiting the eccentric (150) - a first wedge system (152) with two first wedge segments (154), wherein the two first wedge segments (154) are each supported radially inwards on the gear (130), and the two first wedge segments (154) are each supported radially outwards on the first fitting part (110), and - a second wedge system (182) with two second wedge segments (184), wherein the two second wedge segments (184) are each supported radially outwards on the gear (130), and the two second wedge segments (184) are each supported radially inwards on the second fitting part (120). [2] Joint fitting (100) according to claim 1, characterized by , that the two first wedge segments (154) are each supported radially inwards on a shaft section (132), in particular on a collar pull, of the gear (130). [3] Joint fitting (100) according to claim 1 or 2, characterized by, that the two first wedge segments (154) are each supported radially outwards in a central opening of the first fitting part (110), wherein the central opening of the first fitting part (110) is in particular lined with a sliding bearing bushing (114). [4] Joint fitting (100) according to one of claims 1 to 3, characterized by , that the two second wedge segments (184) are each supported radially outwards in a central opening of the gear (130), wherein the central opening of the gear (130) is in particular lined with a sliding bearing bushing (134). [5] Joint fitting (100) according to one of claims 1 to 4, characterized by , that the two second wedge segments (184) are each supported radially inwards on a support section (124) of the second fitting part (120), in particular on a collar pull of the second fitting part (120). [6] Joint fitting (100) according to any one of claims 1 to 5, characterized by, that the first wedge system (152) and the second wedge system (182) are arranged opposite each other with respect to the axis of rotation (A), in particular diametrically opposite each other. [7] Joint fitting (100) according to one of claims 1 to 6, characterized by , that the eccentric (150) can be driven by means of a driver (160) rotatably mounted about the axis of rotation (A), the driver (160) having a first driver segment (166) and a second driver segment (167), which are in particular firmly connected to each other, wherein the first driver segment (166) is arranged circumferentially between the narrow sides of the two first wedge segments (154), and the second driver segment (167) is arranged circumferentially between the narrow sides of the two second wedge segments (184). [8] Joint fitting (100) according to claim 7, characterized by, that the driver (160) has exactly one driver hub (162) and exactly one driver ring (164) which is non-rotatably connected to the driver hub (162), and the driver ring (164) has the first driver segment (166) and the second driver segment (167). [9] Vehicle seat (10) with at least one joint fitting (100) according to one of claims 1 to 8 [10] Vehicle seat (10) according to claim 9, comprising a seat part (12) and a backrest (14) which is adjustable to the seat part (12) by means of at least one joint fitting (100) about an axis of rotation (A).

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