Rotating device and vehicle seat

Abstract

The utility model relates to a rotary device (3) for a vehicle seat (1), comprising an annular ball holder (8) which rolls on a guide rail (7e) of an upper base part (7) and on an underside (6d) of the upper base part (6) such that the upper base part (6) can be rotated relative to the lower base part (7) under the guidance of the ball holder (8). According to the invention, the ball holder (8) consists of at least two sections which are connected to one another in a form-fitting manner by means of a connecting element arranged on the end side; and / or the ball holder (8) has an upper web and / or a lower web which is annular and has a wave-shaped contour, the respective wave-shaped web at least partially resting against the upper base part (6) and / or the lower base part (7).

Description

Rotating device and vehicle seat Technical Field

[0001] The present invention relates to a rotating device and a vehicle seat having such a rotating device. Background Technology

[0002] A vehicle seat is known in which a rotating device is arranged below the seat components, through which the vehicle seat is indirectly (via a lifting mechanism and / or a longitudinal adjustment mechanism) or directly connected to the vehicle floor. This rotating device allows the vehicle seat to rotate about a vertically extending axis of rotation, thereby enabling the vehicle seat to be oriented not only in the direction of travel but also, for example, to the side or rear.

[0003] Such a rotating device is described, for example, in EP 0 812 722 B1 or EP 2 746 095 A2. Therefore, the rotating device has an upper base component and a lower base component, with a ball bearing ring arranged between them. The ball bearing ring has multiple cages in which balls are arranged, thus forming a ball bearing or rolling bearing. Here, the balls roll on guide rails constructed on opposing surfaces of the two base components, allowing the base components to rotate relative to each other. In this way, rotation of the seat portion fastened to the upper base component relative to the lower base component is achieved, which is height-adjustable and / or longitudinally movable relative to the vehicle floor. Similar configurations are also described in JP 11310065A and KR 2003 47972 U Y1.

[0004] KR 101826520 B1, KR 101819453 B1, KR 101826513 B1, CN 107662525 A and KR20200072009 A provide a scheme in which the ball bearing ring is divided into segments in the circumferential direction. Summary of the Invention

[0005] The objective of this invention is to provide a rotating device and a vehicle seat that can be easily manufactured or assembled, have a small weight, and ensure reliable operation.

[0006] This task is solved by the rotating device according to the independent claim and the vehicle seat. The dependent claims describe preferred improvements.

[0007] Therefore, according to the present invention, a rotating device for a vehicle seat is provided, which has at least the following features:

[0008] - An upper base component for mounting on the seat cushion portion of a vehicle seat or on an element fixed to the seat cushion portion;

[0009] - A lower base component for mounting on the floor of a vehicle or on an element fixed to the floor, for example, on an adjustment mechanism, especially on a height adjustment mechanism and / or a longitudinal adjustment mechanism;

[0010] - An annular ball retainer having cages evenly distributed on its circumference, wherein the balls are rotatably accommodated in each cage of the cages;

[0011] The lower base component includes an annular guide rail, and the ball retainer is concentrically positioned within the guide rail, allowing the rotatably accommodated balls to contact and roll on the guide rail.

[0012] The upper base component is concentrically positioned on the lower base component and the ball retainer, such that the rotatably accommodated ball contacts the lower side of the upper base component and can also roll on the lower side, allowing the upper base component to rotate relative to the lower base component about a common axis of rotation, guided or supported by the ball retainer with the rotatably accommodated ball.

[0013] The ball retainer is composed of at least two, preferably at least four, arc-shaped segments. The at least two segments are interconnected in a form-fitting manner by connecting elements arranged at their ends, thereby forming an annular ball retainer; and / or

[0014] The ball retainer has an upper tab with an annular circumference on the upper end side and / or a lower tab with an annular circumference on the lower end side, wherein the profiles of the respective end sides have a wavy profile in the circumferential direction, especially a sinusoidal profile, and wherein the upper tab abuts at least partially against the upper base member with its wavy upper end side, and / or the lower tab abuts at least partially against the lower base member with its wavy lower end side, especially in the guide rail.

[0015] Within the scope of this invention, "upper" and "lower" in this application refer to the installation of the rotating device on the vehicle seat, i.e., axially above and axially below. Therefore, the radial direction refers to the annular path of the corresponding components originating from a common axis of rotation, since the base component and the ball retainer are arranged concentrically with each other.

[0016] Because the annular ball retainer is divided into two or more smaller sections, manufacturing costs are advantageously reduced, and storage and transportation are also simplified, as only smaller parts need to be handled. Furthermore, good system stability is achieved through the tabs, as the tabs can supplement the balls for support. Simultaneously, the balls can also be matched to the profile of the guide rail. While the structural rigidity provided by the wavy or sinusoidal end faces is reduced, the structure still provides sufficient support. Moreover, the wavy or sinusoidal profile of the tabs ensures that the tabs do not continuously abut against the guide rail or underside, thereby minimizing the contact area and consequently minimizing friction between the corresponding components.

[0017] Furthermore, it is preferably specified that the balls, which can be rotatably accommodated in the ball retainer, are located on a first circumference, while the upper and / or lower tabs are located on a second circumference, wherein the first circumference has a larger diameter than the second circumference. This provides two contact surfaces with the base components located above and below it, thereby achieving good stability. Because the retainer faces radially outward, it ensures a simple assembly method for the balls.

[0018] Furthermore, it is preferably specified that each segment of the ball retainer has a first connecting element at a first end and a second connecting element at a second end, wherein the first connecting element of one segment and the second connecting element of the adjacent segment are complementaryly designed and flipped, and wherein the first connecting element of one segment and the second connecting element of the corresponding adjacent segment are inserted into each other to form a form-fit connection between the two adjacent segments. In this way, a reliable form-fit connection between adjacent segments is achieved, and this connection can be easily formed during assembly.

[0019] Specifically, it is specified that the first connecting element is constructed as a connecting piece with an undercut, and the second connecting element is complementaryly constructed as a recess with an undercut, wherein the undercut connecting piece and the undercut recess are inserted into each other so that the corresponding adjacent segments are connected to each other in a shape-fitting manner by these connecting elements. This form of a jigsaw puzzle connection reliably holds the two segments together and achieves a correct and defect-free engagement during assembly.

[0020] It is preferably further specified that each segment of the ball retainer is designed to be identical. In this way, the manufacturing of each segment is simplified, and any segments can be joined together during assembly without having to pay attention to the correct segment selection.

[0021] Furthermore, it is preferably specified that the upper base component and the lower base component each have a radially outer annular region, wherein an annular guide rail is constructed in the radially outer annular region of the lower base component, and wherein at least two spokes, preferably four spokes, converge radially inward toward the axis of rotation from the radially outer annular region of the upper base component and / or from the radially outer annular region of the lower base component, respectively, wherein there are empty spaces between the spokes of the respective base components. This cross-shaped construction of the radially inner regions of the respective base components reduces weight while continuing to provide sufficient stability.

[0022] Furthermore, it is preferably specified that the guide rail has an annular, channel-like recess in the lower base component, which is defined in the radial direction by an inner edge and an outer edge. In this way, the ball retainer can be reliably held on its track concentric with the base component during rotation.

[0023] Furthermore, it is preferably specified that the cage in the ball retainer is defined in the circumferential direction by a side edge and a radially inward side edge, and the cage opens in the radially outward direction as well as in the axial upward and downward directions. Thus, the ball can be easily, preferably, inserted into the cage from the radially outward. Furthermore, it is preferably specified that the side edges of the cage are concavely curved, so that after the ball is inserted into the cage in a simple assembly step, such as by hand, it can be easily held in a form-fit manner.

[0024] Furthermore, it is preferably specified that the ball retainer has an annular body with a radially outer section and a radially inner section, the ball retainer being arranged in the radially outer section, and the axially projecting tabs being arranged in the radially inner section, wherein the radially outer section is preferably arched, especially upwardly arched. This provides the ball retainer with a particularly stable shape. It is also preferably specified that the lower tab has an average smaller axial extension range than the upper tab, so as to better withstand increased loads from above.

[0025] Furthermore, it is specified that the vehicle seat according to the invention has a seat cushion portion and a backrest, as well as a rotating device according to the invention, wherein an upper base component of the rotating device is fastened to the seat cushion portion or to an element fixed to the seat cushion portion, and a lower base component is provided for mounting on a base plate or on an element fixed to the base plate, such as an adjustment mechanism, such that the seat cushion portion and the backrest can rotate about a rotation axis. Attached Figure Description

[0026] The present invention will now be explained in detail with reference to the accompanying drawings and specific embodiments. Wherein are shown:

[0027] Figure 1 shows the vehicle seats in a schematic side view;

[0028] Figure 2 shows an exploded view of the vehicle seat rotation device according to Figure 1;

[0029] Figure 3A shows a section of the ball retainer with an empty cage according to the rotating device of Figure 2;

[0030] Figure 3B shows a section of the ball retainer of the rotating device according to Figure 2, with inserted balls.

[0031] Figures 4A, 4B, and 4C show detailed views of the ball retainer;

[0032] Figure 5 shows a side view of a section of the ball retainer;

[0033] Figures 6A and 6B show the modular components that make up the ball retainer;

[0034] Figure 7 shows the assembled rotating device; and

[0035] Figures 7A and 7B show cross-sectional views of the assembled rotating device. Detailed Implementation

[0036] Figure 1 schematically shows a vehicle seat 1 with a seat cushion portion 1a and a backrest 1b pivotable relative to the seat cushion portion. A rotating device 3 is arranged under the seat cushion portion 1a, which is used to secure it to the vehicle floor 4. Here, the rotating device 3 can be directly secured to the floor 4 by a corresponding bracket, or it can be indirectly secured by another adjustment mechanism 5, such as a lifting mechanism and / or a longitudinal adjustment mechanism, so that the rotating device 3 can be adjusted together with the seat cushion portion 1a and the backrest 1b in the vertical direction V (along the height direction) and / or in the longitudinal direction L.

[0037] As shown in the exploded view of Figure 2, preferably, the rotating device 3 has an upper base component 6, a lower base component 7, and a ball retainer 8, all of which are concentric with the rotation axis D. Here, "upper" and "lower" refer to the mounting position of the rotating device 3 on the vehicle seat 1 in the axial direction X. The upper base component 6 and the lower base component 7 each have radially outer annular regions 6a and 7a, from which four spokes 6b and 7b converge radially inward toward the rotation axis D. Empty spaces 6c and 7c exist between the spokes 6b and 7b of the respective base components 6 and 7, such that the base components 6 and 7 are respectively formed in a cross shape, thereby saving material and reducing weight.

[0038] A channel-shaped recess 7d is formed circumferentially in the radially outer annular region 7b of the lower base component 7, forming an annular guide rail 7e defined by an inner edge 7e1 and an outer edge 7e2 of the annular surround. A ball retainer 8 is housed in the guide rail 7e in a manner rotatable about a rotation axis D. The ball retainer 8 has an annular body 8a that can be divided into a radially outer segment 8b and a radially inner segment 8c, as also shown in FIG. 3A. In the radially outer segment 8b, retainers 9 are introduced into the annular body 8a at uniform (arc) spacing A. As shown in FIG. 3B, balls 10 are mounted in each retainer 9.

[0039] As shown in Figure 4A, in the front view of the ball retainer 8, the retainer 9 opens radially outward and also upward and downward in the axial direction X, defined by two side edges 9a and one radially inward side edge 9b. The side edges 9a are preferably convex in the radial direction R and also concave in the axial direction X (see Figure 4B), thus forming the outer contour of the ball 10 with a very small gap. The two distal ends 9c (radially outward) of the side edges 9a are spaced E apart from each other, a distance less than the ball diameter d10 of the corresponding ball 10. Therefore, the corresponding ball 10 can be engaged into the retainer 9 with relatively small force and held therein in a form-fitting and rotatable manner.

[0040] The inserted ball 10 is located on a first circumferential line K1, which extends axially above the guide rail 7e of the lower base component 7. Therefore, the ball retainer 8 is positioned in the guide rail 7e such that all the balls 10 can roll in the guide rail 7e, as shown in the cross-sectional view in FIG. 7B for one of the balls 10.

[0041] In the radially inner section 8c of the annular body 8a, the upper tab 11 protrudes vertically upward (in the axial direction X), and the lower tab 12 protrudes vertically downward (in the axial direction X), wherein the two tabs 11, 12 preferably completely surround the ball retainer 8. As can be seen from Figure 5, the upper (axial) end side 11a of the upper tab 11 has a first profile C1, and the lower (axial) end side 12a of the lower tab 12 has a second profile C2, wherein the two profiles C1, C2 have a continuously arcuate profile, especially a sinusoidal profile. The extent of extension of the tabs 11, 12 in the axial direction X thus varies continuously on the circumference of the ball retainer 8.

[0042] Here, the upper tab 11 has a larger axial extension range on average than the lower tab 12, as also shown in FIG. 4C. Furthermore, as can be seen from FIG. 4C and FIG. 7A, the radially outer section 8b of the annular body 8a has an upward bulge, thereby making the radially outer section 8b in which the ball 10 is held more stable.

[0043] The two tabs 11 and 12 are located on a second circumferential line K2 with a diameter smaller than that of the first circumferential line K1, that is, they are located radially more inward. The second circumferential line K2 is chosen such that it is also located in the guide rail 7e of the radially outer annular region 7b of the lower base component 7 or above it in the axial direction, as shown in the cross-sectional view in FIG7A. In this way, in addition to the ball 10, the ball retainer 8 is also supported on the lower base component 7 via the lower connecting tab 12. However, since the second profile C2 is arcuate or sinusoidal, the contact surface with the guide rail 7e of the lower base component 7 is reduced, thereby reducing the friction between the two components. In order to achieve uniform support here, the retainer 9 is located on the circumference of the ball retainer 8 at a circumferential position where the arcuate or sinusoidal lower tab 12 (and the upper tab 11) have the minimum axial extension range, that is, the ball retainer 8 is just not supported on the guide rail 7e of the lower base component 7.

[0044] As can also be seen in Figure 7A, the upper tab 11 is shaped such that it rests against the lower side 6d of the upper base component 6 at its highest axial point, so that the upper base component 6 can also be supported thereon (see Figure 7B) in addition to the ball 10. Here, the contact surface is minimized by the arcuate or sinusoidal implementation of the first contour C1, thereby minimizing the friction between the upper base component 6 and the ball retainer 8. A uniform support effect is also achieved by offsetting the highest points of the upper tab 11 and the ball 10 in the circumferential direction.

[0045] As shown in the figures described herein and also in Figures 6A and 6B, the ball retainer 8 is divided into four segments Si, numbered N, where i = 1, 2, ..., N. These segments are designed identically in the illustrated embodiments. Each segment Si has a first end Sia and a second end Sib, wherein a first connecting element 13a, for example in the form of a tongue or connecting piece with an undercut H, is located on the first end Sia, and a second connecting element 13b, for example in the form of a recess with an undercut H, is located on the second end Sib. The two connecting elements 13a and 13b are designed to complement each other, allowing them to interlock in a puzzle-like or shape-fitting manner due to their undercut H, so as to engage at the end sides and hold the respective segments Si together. The connecting elements 13a and 13b can be designed such that they can only be inserted or engaged in a specific manner to prevent errors during connection (preventing misassembly).

[0046] If all four segments Si are joined together in this manner, a closed loop forming the ball retainer 8 is created. Alternatively, more than four segments N can be selected and then interlocked at the ends accordingly to form a closed loop. Preferably, the division of the ball retainer 8 into N segments Si should be chosen in such a way that the same segments Si can be used, which simplifies both assembly and manufacturing.

[0047] The manufacturing of the rotating device 3 can then be carried out as follows: First, N segments Si are provided, each segment having a retainer 9 at a uniform (arc) spacing A in the radially outer segment 8b, as described above. Subsequently, a corresponding number of balls 10 are provided and pressed into the corresponding retainers 10, so that these balls are preferably received in the retainers in a form-fitting manner and can also rotate in the retainers.

[0048] Subsequently, the provided segments Si are joined together at the ends via their connecting elements 13a and 13b to form a closed loop that constitutes the ball retainer 8. Theoretically, the balls 10 can also be introduced into the cage 9 after the closed loop is formed.

[0049] Next, the ball retainer 8, together with the mounted balls 10, is concentrically placed into the guide rail 7e of the lower base component 7, wherein the radial movement of the ball retainer 8 is limited by the inner edge 7e1 and the outer edge 7e2 of the guide rail 7e. When properly assembled, the ball retainer 8 is able to rotate about the axis of rotation D within the guide rail 7e, wherein the ball retainer 8 rolls on the balls 10 and is supported at two points on the lower base component 7 via the arcuate lower tabs 12.

[0050] Next, the upper base component 6 is concentrically placed onto the lower base component 7. The movement of the ball retainer 8 located in the guide rail 7e is thus also limited by the upper base component 6, restricting its upward (axial) movement. Here, the lower side 6d of the upper base component 6 is point-supported on the upper tab 11 of the ball retainer 8. Here, the upper base component 6, through the interaction of the ball retainer 8 and the lower base component 7, allows the two base components 6 and 7 to rotate relative to each other about the rotation axis D under the guidance of the ball retainer 8.

[0051] The upper base component 6 is connected to the seat cushion portion 1a, for example via a corresponding connecting or fastening mechanism fastened to the support of the upper base component 6 and the seat cushion portion 1a. The lower base component 7 is directly fastened to the base plate 4, for example via a corresponding support, or indirectly fastened via another adjustment mechanism 5, for example via a lifting mechanism and / or a longitudinal adjustment mechanism. This allows the seat cushion portion 1a, together with the backrest 1b hinged thereto, to rotate relative to the base plate 4 about the axis of rotation D.

[0052] List of reference numerals

[0053] 1. Vehicle Seats

[0054] 1a Seat cushion portion

[0055] 1b Backrest

[0056] 3 Rotating device

[0057] 4. Base plate

[0058] 5. Adjustment mechanism

[0059] 6. Upper base components

[0060] 6a Radial outer annular region of the upper base component 6

[0061] 6b Spokes of upper base component 6

[0062] 6c Empty space of the upper base component 6

[0063] The lower side of the upper base component 6d

[0064] 7. Lower base components

[0065] 7a Radial outer annular region of the lower base component 7

[0066] 7b Spokes of the lower base component 7

[0067] 7c Empty space of lower base component 7

[0068] 7d Channel-like depression

[0069] 7e guide rail

[0070] 7e1 inner edge of guide rail 7e

[0071] 7e2 outer edge of guide rail 7e

[0072] 8 Ball retainers

[0073] 8a Annular body of ball retainer 8

[0074] 8b The radially outer section of the annular body 8a

[0075] 8c The radially inner section of the annular body 8a

[0076] 9. Cage

[0077] 9a Side edge of cage 9

[0078] 9b The radially inner side edge of cage 9

[0079] 9c distal end of side edge 9a

[0080] 10 ball bearings

[0081] 11. Uploaded video.

[0082] 11a Upper end side of the upper connector 11

[0083] 12 Subsequent splices

[0084] 12a Lower end side of the lower connector 12

[0085] 13a First connecting element

[0086] 13b Second connecting element

[0087] A Spacing

[0088] C1 First outline

[0089] C2 Second Outline

[0090] D. Rotation axis

[0091] Distance between E and the far end 9c

[0092] H undercut

[0093] K1 First Circumference Line

[0094] K2 Second Circumference Line

[0095] L (vertical direction)

[0096] The number of Si segments in section N

[0097] Si, the i-th section

[0098] The first end of the i-th segment Si of Sia

[0099] The second end of the i-th segment Sib

[0100] V Vertical direction

[0101] X-axis direction

Claims

1. A rotating device (3) for a vehicle seat (1), comprising at least: - An upper base component (6) for mounting on the cushion portion (1a) of a vehicle seat (1) or on an element fixed to the cushion portion; - A lower base component (7) for mounting on the floor (4) of the vehicle or on an element fixed to the floor; An annular ball retainer (8) has cages (9) evenly distributed around its circumference, in which balls (10) are rotatably housed; wherein an annular guide rail (7e) is constructed in the lower base member (7), and the ball retainer (8) is concentrically positioned in the guide rail such that the rotatably housed balls (10) can contact the guide rail (7e) and roll on the guide rail; wherein the upper base member (6) is concentrically positioned on the lower base member (7) and the ball retainer (8) such that the rotatably housed balls (10) can contact the lower side (6d) of the upper base member (6) and also roll on the lower side, such that the upper base member (6) can rotate relative to the lower base member (7) about a common rotation under the guidance of the ball retainer (8) with the rotatably housed balls (10). The axis (D) rotates, characterized in that the ball retainer (8) is composed of at least two (N) segments (Si), wherein the at least two segments (Si) are interconnected in a form-fitting manner by connecting elements (13a, 13b) arranged on the end sides, such that the assembled segments (Si) form an annular ball retainer (8); and / or the ball retainer (8) has an upper tab (11) with an annular surround on the upper end side (11a) and / or Or a lower tab (12) with a lower end side (12a) annularly surrounding it, wherein the contours (C1, C2) of the corresponding end sides (11a, 12a) have a wavy profile in the circumferential direction, and wherein the upper tab (11) at least partially abuts against the upper base member (6) with its wavy upper end side (11a), and / or the lower tab (12) at least partially abuts against the lower base member (7) with its wavy lower end side (12a).

2. The rotating device (3) according to claim 1, characterized in that, The ball retainer (8) consists of at least four segments (Si) in number (N).

3. The rotating device (3) according to claim 1, characterized in that, The corresponding end faces (11a, 12a) have contours (C1, C2) with sinusoidal shapes in the circumferential direction.

4. The rotating device (3) according to claim 1, characterized in that, In the guide rail (7e), the upper tab (11) at least partially abuts against the upper base member (6) with its wavy upper end side (11a), and / or the lower tab (12) at least partially abuts against the lower base member (7) with its wavy lower end side (12a).

5. The rotating device (3) according to claim 1, characterized in that, The balls (10) that can be rotatably accommodated in the ball retainer (8) are located on a first circumferential line (K1), and the upper tab (11) and / or the lower tab (12) are located on a second circumferential line (K2), wherein the first circumferential line (K1) has a larger diameter than the second circumferential line (K2).

6. The rotating device (3) according to claim 1 or 5, characterized in that, Each segment (Si) of the ball retainer (8) has a first connecting element (13a) at a first end (Sia) and a second connecting element (13b) at a second end (Sib), wherein the first connecting element (13a) of a segment (Si) is designed to be complementary to and flipped with the second connecting element (13b) of an adjacent segment (Si), wherein the first connecting element (13a) of a segment (Si) and the second connecting element (13b) of the corresponding adjacent segment (Si) are inserted into each other to form a form-fitting connection between two adjacent segments (Si).

7. The rotating device (3) according to claim 6, characterized in that, The first connecting element (13a) is designed as a connecting piece with an undercut (H), and complementaryly, the second connecting element (13b) is designed as a recess with an undercut (H), wherein the connecting piece with the undercut and the recess with the undercut are inserted into each other, thereby connecting the corresponding adjacent segments (Si) to each other in a shape-fitting manner through the connecting elements (13a, 13b).

8. The rotating device (3) according to claim 1, characterized in that, Each segment (Si) of the ball retainer (8) is designed identically.

9. The rotating device (3) according to claim 1, characterized in that, The upper base component (6) and the lower base component (7) each have radially outer annular regions (6a, 7a), wherein an annular guide rail (7e) is constructed in the radially outer annular region (7a) of the lower base component (7), and wherein at least two spokes (6b, 7b) converge radially inward toward the axis of rotation (D) from the radially outer annular region (6a) of the upper base component (6) and / or from the radially outer annular region (7a) of the lower base component (7), respectively, wherein there is a void space (6c) between the spokes (6b, 7b) of each base component (6, 7).

10. The rotating device (3) according to claim 9, characterized in that, Four spokes (6b, 7b) converge radially inward toward the axis of rotation (D) from the radially outer annular region (6a) of the upper base component (6) and / or from the radially outer annular region (7a) of the lower base component (7).

11. The rotating device (3) according to claim 1, characterized in that, The guide rail (7e) has an annular channel-shaped recess (7d) in the lower base component (7), the recess being defined in the radial direction (R) by an inner edge (7e1) and an outer edge (7e2).

12. The rotating device (3) according to claim 1, characterized in that, The retainer (9) in the ball retainer (8) is defined radially inward in the circumferential direction by a side edge (9a) and by a radially inward side edge (9b), and the retainer (9) opens radially outward and axially upward and downward.

13. The rotating device (3) according to claim 12, characterized in that, The side edge (9a) of the cage (9) is concavely bent.

14. The rotating device (3) according to claim 1, characterized in that, The ball retainer (8) has an annular body (8a) having a radially inner section (8c) and a radially outer section (8b), in which a retainer (9) with balls (10) is arranged, and in which axially protruding tabs (11, 12) are arranged, wherein the radially outer section (8b) is arched.

15. The rotating device (3) according to claim 14, characterized in that, in, The radially outer section (8b) arches upward.

16. The rotating device (3) according to claim 1, characterized in that, The lower tab (12) has an average smaller axial extension range than the upper tab (11).

17. The rotating device (3) according to claim 1, characterized in that, The lower tab (12) has an average smaller axial extension range than the upper tab (11).

18. A vehicle seat (1) having a seat cushion portion (1a) and a backrest (1b) and a rotating device (3) according to any one of the preceding claims, wherein, The upper base component (6) of the rotating device (3) is fastened to the cushion portion (1a) or to an element fixed to the cushion portion, and the lower base component (7) is provided for mounting on the base plate (4) or on an element fixed to the base plate, such as an adjustment mechanism (5), so that the cushion portion (1a) and the backrest (1b) can rotate about the rotation axis (D).

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