DE202009007520U1 - Fitting for a vehicle seat - Google Patents

Abstract

Fitting for a vehicle seat, in particular for a motor vehicle seat, with a first fitting part (11; 311; 411; 511) on which a toothed rim (17; 317; 517) is formed, a second fitting part (12) on which a toothed wheel ( 16) which meshes with the ring gear (17; 317; 517), whereby the two fitting parts (11, 12; 311; 411; 511) are in gear connection with each other, and a rotatably mounted, driven by a driver (21) , circumferential eccentric (27) for driving a relative rolling movement of gear (16) and ring gear (17; 317; 517), characterized in that the first fitting part (11; 311; 411; 511) is concentric with the ring gear (17; 317; 517) has a receptacle for the eccentric (27).

Description

The The invention relates to a fitting for a vehicle seat with the features of the preamble of claim 1.

A fitting of this type with an eccentric planetary gear is, for example, in the DE 10 2006 044 490 A1 used. 7 the present application shows an exploded view of such a fitting. Of the two disc-shaped fitting parts has a fitting part 11 ' - Spaced in the radial direction from its outer edge - a sprocket 17 ' on which a smaller gear 16 ' wraps around and meshes with it, taking the gear 16 ' at the other fitting part 12 ' - spaced in the radial direction from its outer edge - is formed. This other fitting part 12 ' also has one - with a plain bearing bushing 28 lined receptacle for by two wedge segments 27 defined eccentric. The two wedge segments 27 are with their inside on a collar of the former fitting part 11 ' supported.

Of the Invention is based on the object, a fitting of the above type, in particular weight and / or cost to reduce. This object is achieved by solved a fitting with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

By doing the first fitting concentric with the ring gear a recording for the eccentric, which preferably lined with a plain bearing bush is, those acting on the eccentric or this covering components, such as omega spring, cover or sealing ring, have a larger maximum radius. Of the Sprocket has a larger one Diameter than the gear on, so that the associated first fitting part up to the sprocket a larger radial extent of the installation space offers. Accordingly, then preferably provided Collar on which the eccentric is supported and which can also serve to support the driver, concentric with the gear formed on the second fitting part.

Of the Space advantage is particularly useful when the gear at the radially outer edge of the associated second Fitting part is formed. This makes the radial in the prior art outside the gear located area of the second fitting part dispensable. The smaller compared to the prior art second fitting part therefore requires less material, which Saves weight and costs.

The Training the sprocket at the radially outer edge the associated first fitting part allows for the same External dimensions compared to the known fitting an enlargement of the gearing diameter. With the same material thickness, this leads to a Increasing the strength over the known Fitting, as the specific tooth load and strain on the bearings is reduced. Alternatively, to achieve the same strength the material thickness can be reduced d. H. it can use thinner materials which saves weight and costs. It is also possible, the outer dimension relative to the known fitting to reduce while maintaining the same strength. Also this requires less material, which means weight and costs saves.

Preferably is the first fitting at least approximately in formed the shape of a pot, wherein the ring gear on the inner wall of the Pot is provided. Accordingly, the second fitting part formed at least approximately in the form of a disc be, wherein the gear forms the edge of the disc.

The Both fittings can be structurally related a disc-shaped, held together by a Umklammerungsring Form unit, wherein the first fitting part and the Umklammerungsring (fixed) are connected to each other and the second fitting part between to record oneself. This disc-shaped unit forms a compact shape that saves radial space and in different places can be fixed, what the number of uses elevated. The clasp ring can also be a functional Part of the first fitting part, for example, the sprocket exhibit. In both cases, the clasp ring The gear cover and cover, which protects it becomes.

The Using an eccentric orbit gear allows a stepless Inclination adjustment of the backrest. The saving of a central pinion opposite a planetary gear leads to the emergence of a Tumbling motion superimposed on the relative rotation of the fittings is. The eccentric planetary gear can be driven manually or by motor become. For the latter case is a two-piece driver advantageous, a driving ring made of metal, which the crash forces record and forward, and a Mitnehmerbuchse plastic includes, which initiates the driving forces. The eccentric can be an integrally formed fixed eccentric or a multi-part, consisting of against each other prestressed wedge segments Be eccentric, which determines the fitting play.

The invention can also be applied to locking fittings (with bolts and a ring gear formed on the pot) and transferred to applications outside the vehicle seat.

in the The following is the invention with reference to several shown in the drawing Embodiments explained in detail with modifications. Show it

1 an exploded view of the first embodiment,

2 a radial section through the first embodiment with drive shaft,

3 an axial section through the first embodiment without drive shaft,

4 a schematic representation of a vehicle seat,

5 an axial section through a second embodiment,

6 a half section through a modification with locking ring,

7 an exploded view of a known fitting,

8th an axial section through a third embodiment,

9 an axial section through a fourth embodiment, and

10 an axial section through a fifth embodiment.

A vehicle seat 1 for a motor vehicle has a seat part 3 and a relative to the seat part 3 in its inclination adjustable backrest 4 on. For tilt adjustment of the backrest 4 is manually, for example by means of a handwheel 5 , or motor, for example by means of an electric motor, a drive shaft 7 turned horizontally in the transition area between seat part 3 and lean 4 is arranged. On both sides of the vehicle seat 1 engages the drive shaft 7 rotatably in a fitting in a manner described later 10 one. The drive shaft 7 defines the used direction information of a cylindrical coordinate system.

The fitting 10 is designed as a geared fitting, in which a first fitting part 11 and a second fitting part 12 are connected by means of a transmission for adjusting and locking each other, more precisely by means of a - vorlie lowing self-locking - eccentric orbit gear, as for example in the DE 44 36 101 A1 is described, the relevant disclosure of which is expressly incorporated.

With the assembly of the fitting 10 is the first fitting part 11 For example, with the structure of the seat part 3 connected, so fixed seat. The second fitting part 12 is then firm with the structure of the backrest 4 connected, so leaning. These assignments of fitting parts 11 and 12 are preferred when the location of the drive shaft 7 concerning the backrest 4 should be constant, for example, a drive shaft 7 rotating electric motor on the structure of the backrest 4 to be able to attach. The assignments of fittings 11 and 12 However, they can also be reversed, ie the first fitting part 11 would then be leaning and the second fitting part 12 seat part. The latter assignments of fitting parts 11 and 12 are preferred when the radial distances of the attachment points between the fitting 10 and a relatively thin backrest sheet should be as large as possible, or if the drive shaft 7 and the backrest 4 should have the same direction of rotation.

The two fitting parts 11 and 12 let each inscribe approximately in a circular disc shape. The two fitting parts 11 and 12 are preferably made of metal, especially steel. For receiving the axially acting forces, ie the cohesion of the fitting parts 11 and 12 is a clasp ring 13 intended. Such cohesion by means of a Umklammerungsrings is for example in the US 6,799,806 A described, the related disclosure of which is expressly incorporated. The preferably metallic Umklammerungsring 13 is fixed to the first fitting part 11 connected, preferably first pressed and then welded. Alternatively, the clasp ring 13 flanged, where he is the first fitting part 11 overlaps. On one of its faces, the Umklammerungsring 13 a radially inwardly bent edge, by means of which he, optionally with the interposition of a sliding ring, the second fitting part 12 radially overlaps externally, without the relative movement of the two fitting parts 11 and 12 to hinder. In terms of construction, the two fitting parts 11 and 12 therefore together a disc-shaped unit.

To form the transmission is on the second fitting part 12 an externally toothed gear 16 and at the first fitting part 11 an internally toothed ring gear 17 formed, which mesh with each other. The diameter of the top circle of the external toothing of the gear 16 is at least one tooth height smaller than the diameter of the root circle of the internal toothing of the ring gear 17 , A corresponding difference in the number of teeth of gear 16 and sprocket 17 of at least one tooth allows a rolling movement of the ring gear 17 on the gear 16 ,

The second fitting part 12 points to the sprocket 17 facing side concentric with the gear 16 a first collar 19 on, as a collar on the second fitting part 12 molded (ie integrally formed) or attached to it as a separate sleeve can be. In the first collar 19 is a driver 21 by means of a hub 22 rotatably mounted. The driver 21 is preferably made of plastic. The hub 22 of the driver 21 is central with a hole 23 for receiving the drive shaft 7 Mistake. The profile of the hole 23 is suitable for the profile of the drive shaft 7 , in this case a splined shaft profile formed. Following his hub 22 has the driver 21 one piece with the hub 22 trained cover 25 with a larger diameter than the hub.

On the first collar 19 are two wedge segments 27 (with their curved inner surfaces) supported, the (with their curved outer surfaces) the first fitting part 11 by means of a in the first fitting part 11 rotatably pressed plain bearing bush 28 to store. The driver 21 has - radially spaced from the hub 22 - a game between the narrow sides of the wedge segments 27 capturing driver segment 29 on, which with the cover 25 and with the hub 22 is integrally formed. The facing broad sides of the wedge segments 27 each take an angled end finger of an omega spring, each with a recess defined by projecting material parts 35 on which the wedge segments 27 apart in the circumferential direction, wherein in operation the protruding material parts of the wedge segments 27 touch each other and can apply.

The driver 21 is on the outside of the second fitting part 12 through a clip-on circlip 43 axially secured. On the outside of the first fitting part 11 is between its radially outer edge and the cover 25 a sealing ring 44 provided, for example, made of rubber or soft plastic, with the cover 25 is connected, in particular clipped.

Through the wedge segments 27 (and the omega feather 35 ) defines an eccentric, which in extension of the direction of eccentricity of the gear 16 at such a defined engagement point in the sprocket 17 suppressed. When driven by the rotating drive shaft 7 a torque is first applied to the driver 21 and by means of the driver segment 29 then transferred to the so defined eccentric, which along the plain bearing bush 28 slides with displacement of the direction of eccentricity and thus under displacement of the engagement point of the gear 16 in the sprocket 17 , which is represented as a tumbling rolling movement, ie as a relative rotation with superimposed wobbling motion. The inclination of the backrest 4 is thus infinitely adjustable between several positions of use.

Depending on the fitting of the fitting 10 becomes the eccentric (ie the wedge segments 27 ) from the first fitting part 11 stored while he in turn the second fitting part 12 stores, or the conditions are exactly the opposite, ie the eccentric is supported on the second fitting part 12 off and is on the first fitting part 11 supported.

According to the prior art ( 7 ) become the gear 16 ' and the sprocket 17 ' by a stamping process on the associated fitting parts 11 ' and 12 ' so trained and at the same time these fitting parts 11 ' . 12 ' punched out of their starting material so that their radially outer edge is spaced from the radially further internal teeth and an annular material section is defined. Otherwise, the eccentric epicyclic gear used in the prior art coincides with that described above.

According to the invention are now the gear 16 and the sprocket 17 adapted to the (radially outer) edge of the associated fitting part 11 . 12 form, ie the annular material part is omitted, as in the 1 to 4 you can see. More precisely, the gear is 16 on the (radially outer) lateral surface of the (at least approximately) disc-shaped second fitting part 12 formed while the sprocket 17 on the inner wall of the (at least approximately) cup-shaped first fitting part 11 is trained.

For this purpose, the second fitting part 12 punched so that the radially outer cut surface is toothed, and thus the gear 16 with its radially outwardly facing teeth forms. The top circle of the gear 16 defines the outer radius of the disc-shaped second fitting part 12 , Preferably, the formation of the shallower gradations of the second fitting part takes place 12 and the gear 16 and pulling the first collar 19 with a single embossing punching process, but also several manufacturing steps for the formation of the second fitting part 12 possible.

Accordingly, in the manufacture of the first fitting part 11 first punched out a flat preform (and formed the shallower gradations). This preform is given by folding the edges of the pot shape, wherein by means of a punch each radially inside and radially outside the wall of the pot of the ring gear 17 with its radially inwardly facing teeth in the wall is pronounced (and to form the receptacle for the plain bearing bush 28 a small, second collar 51 is pulled). The root circle of the sprocket 17 to Regardless of the material thickness defines the outer radius of the first fitting part 11 , The outer wall of the pot follows the course of the sprocket 17 , is so wavy. It is also conceivable to combine the two production steps into a single embossing-punching process.

Apart from any facets, warts o. Ä. To attach the fitting 10 have the two fitting parts 11 and 12 one each by the number of teeth of sprocket 17 or gear 16 defined, cyclic symmetry with respect to an axis in the center of the plain bearing bush 28 or the first collar 19 is arranged.

The first fitting part 11 and the associated encircling ring 13 take the second fitting part 12 between themselves. The encircling ring overlaps 13 (With its radially inwardly facing, annular edge region) the gear 16 , whereby a protection of the transmission connection, in particular against the penetration of foreign bodies and the contamination and damage of the teeth, is given. The clasp ring 13 also overlaps the - in this case corrugated - outer wall of the pot, so that on the second fitting part 12 facing away from the first fitting part 11 , with the present waviness, in a circumferential series of depressions arise, which can be used for welding.

In the embodiments described so far is the sprocket 17 having pot an integrally formed component, namely the first fitting part 11 , In a second embodiment ( 5 ) is the pot (ie the first fitting part 11 ) a multi-part component, namely a bearing disc (with the with the plain bearing bush 28 lined receptacle for the eccentric) as the bottom and the thus firmly connected, axially projecting wall, which the sprocket 17 having. The sprocket 17 is thus still on the edge of the first fitting part 11 formed, but not integral with the other areas of the first fitting part 11 , It is preferred that the Umklammerungsring 13 , which firmly with the first fitting part 11 is connected, the sprocket 17 has, namely in its extending in the axial direction of the cladding region.

In order to improve the dynamic operating behavior, in a modification ( 6 ) to all described embodiments and modifications a locking ring 53 be provided, as he for example in the DE 195 48 809 C1 is disclosed, the relevant disclosure of which is expressly incorporated. The preferably formed of spring plate locking ring 53 is axially between the plane with the wedge segments 27 and the plane with the curved body of the omega spring 35 arranged. The end fingers of the omega spring 35 penetrate the locking ring 53 which has small windows for this purpose. By means of resilient tips on the radially outer edge of the locking ring acts 53 positive locking with a locking toothing 55 together, which at the first fitting part 11 especially for this purpose. By the plant of the end fingers of the omega spring 35 to the edge of the window in the locking ring 53 are the wedge segments 27 in their movement relative to the first fitting part 11 locked, especially against the output side introduced vibrations or the like, which a slight adjustment of the fitting 10 could cause. To lift the blocking effect, are at the driver 21 in the area of the cover 25 and at the lock ring 53 provided cooperating elements. When driving the driver 21 these elements control the locking ring 53 from the locking teeth 55 out, leaving the wedge segments 27 can move freely.

To have sufficient (axial) space for the locking teeth 55 To have available, is the second collar 51 , the first fitting part 11 for image formation with the plain bearing bush 28 lined receptacle is provided for the eccentric, preferably on the second fitting part 12 opposite side of the first fitting part 11 formed projecting, so the cover 25 pointing out.

following further embodiments are described which are in terms of the two fittings and the Umklammerungsrings partly from the two embodiments described above and their variations, with respect to the other components and how they work with them, which is why all the same components also bear the same reference numerals.

In a third embodiment ( 8th ) is a second fitting part 12 provided, that the second fitting part 12 the first and second embodiments ( 1 - 3 and 5 ) is similar, so a gear 16 with radially outwardly facing teeth and a first collar 19 having. The first fitting part 311 Although the third embodiment has one with a plain bearing bush 28 lined and in a second collar 51 ( 6 ) provided for receiving the eccentric on. However, same first fitting part 311 and clasp ring 313 otherwise the corresponding components of the second Ausführungsbeipiels. In particular, the sprocket 317 at the clasp ring 313 educated. First fitting part 311 and clasp ring 313 lie with a circular encircling step 361 , which serves the pre-positioning, to each other. The weld between the first fitting part 311 and clasp ring 313 becomes from the radial direction he witnesses, for example by means of laser welding.

The fourth embodiment ( 9 ) is similar to the third embodiment, in particular with regard to the second fitting part 12 , the training of the sprocket 317 and with a plain bearing bush 28 lined and in a second collar 51 provided receptacle for the eccentric. However, this is the first fitting part 411 in the axial direction in the annular with a circumferential stage 461 provided clasp ring 413 introduced, so that the latter the first fitting part 411 radially overlaps externally. The weld between the first fitting part 411 and clasp ring 413 is generated from the axial direction, for example by means of laser welding.

In a fifth embodiment ( 10 ) is a second fitting part 12 provided, that the second fitting part 12 the four other embodiments ( 1 - 3 . 5 . 8th and 9 ) is similar, so a gear 16 with radially outwardly facing teeth and a first collar 19 having. The first fitting part 511 Although one has a plain bearing bush 28 lined and in a second collar 51 ( 6 ) provided for receiving the eccentric, but it is similar in terms of the formation of the sprocket 517 the second fitting part 11 ' of the prior art ( 7 ). In particular, it is produced by means of a single embossing-stamping process and has radially outside of the toothed rim 517 still an annular area, which from the Umklammerungsring 513 is overruled. The clasp ring 513 resembles the clasp ring 13 of the first embodiment (except for the diameter) and that of the prior art ( 7 ).

1

vehicle seat

3

seat part

4

rest

5

handwheel

7

drive shaft

10

fitting

11 11 ', 311, 411, 511

first fitting part

12 12 '

second fitting part

13 313, 413, 513

clasping

16 16 '

gear

17 17 ', 317, 517

sprocket

19

first collar

21

takeaway

22

hub

23

drilling

25

cover plate

27

wedge segment

28

plain bearing bush

29

driving segment

35

Omega spring

43

circlip

44

seal

51

second collar

53

locking spring

55

locking teeth

361, 461

step

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006044490 A1 [0002]
• - DE 4436101 A1 [0023]
• US Pat. No. 6,799,806 A [0025]
• - DE 19548809 C1 [0039]

Claims (18)

Fitting for a vehicle seat, in particular for a motor vehicle seat, with a first fitting part ( 11 ; 311 ; 411 ; 511 ), on which a sprocket ( 17 ; 317 ; 517 ) is formed, a second fitting part ( 12 ) on which a gear ( 16 ) is formed, which with the sprocket ( 17 ; 317 ; 517 ) meshes, whereby the two fitting parts ( 11 . 12 ; 311 ; 411 ; 511 ) are in gear connection with each other, and a rotatably mounted, by a driver ( 21 ) driven, rotating eccentric ( 27 ) for driving a relative rolling movement of gear ( 16 ) and sprocket ( 17 ; 317 ; 517 ), characterized in that the first fitting part ( 11 ; 311 ; 411 ; 511 ) concentric with the sprocket ( 17 ; 317 ; 517 ) a receptacle for the eccentric ( 27 ) having. Fitting according to claim 1, characterized in that the receptacle for the eccentric ( 27 ) with a plain bearing bush ( 28 ) is lined. Fitting according to one of the preceding claims, characterized in that the second fitting part ( 12 ) concentric with the gear ( 16 ) a first collar ( 19 ), on which the eccentric ( 27 ) is supported. Fitting according to one of the preceding claims, characterized in that the first fitting part ( 11 ) to form the receptacle for the eccentric ( 27 ) a second collar ( 51 ) having. Fitting according to one of the preceding claims, characterized in that the gear ( 16 ) at the radially outer edge of the associated second fitting part ( 12 ) is trained. Fitting according to claim 5, characterized in that the second fitting part ( 12 ) is formed at least approximately in the form of a disc, wherein the gear ( 16 ) forms the edge of the disk. Fitting according to one of the preceding claims, characterized in that the sprocket ( 17 ; 317 ) at the radially outer edge of the associated first fitting part ( 11 ; 311 ; 411 ) is trained. Fitting according to claim 7, characterized in that the first fitting part ( 11 ; 311 ; 411 ) is formed at least approximately in the shape of a pot, wherein the sprocket ( 17 ; 317 ) is provided on the inner wall of the pot. Fitting according to claim 8, characterized in that the outer wall of the pot the course of the sprocket ( 17 ; 317 ) follows. Fitting according to one of the preceding claims, characterized in that the two fitting parts ( 11 . 12 ; 311 ; 411 ; 511 ) structurally together a disc-shaped, from a clasp ring ( 13 ; 313 ; 413 ; 513 ) are held together, wherein the first fitting part ( 11 ; 311 ; 411 ; 511 ) and the clasp ring ( 13 ; 313 ; 413 ; 513 ) and the second fitting part ( 12 ) between them. Fitting according to claim 10, characterized in that the Umklammerungsring ( 13 ; 313 ; 413 ; 513 ) the gear ( 16 ) overlaps. Fitting according to claim 10 or 11, characterized in that the sprocket ( 17 ; 317 ) on the fixed with the first fitting part ( 11 ; 311 ; 411 ) clasp ring ( 13 ; 313 ; 413 ) is trained. Fitting according to one of claims 10 to 12, characterized in that a weld between the first fitting part ( 11 ; 311 ; 411 ; 511 ) and the clasp ring ( 13 ; 313 ; 413 ; 513 ) is generated from a direction with respect to a drive shaft ( 7 ) of the fitting ( 10 ) is axial or radial. Fitting according to one of the preceding claims, characterized in that the driven by the eccentric epicyclic gear relative rolling movement between the first fitting part ( 11 ; 311 ; 411 ; 511 ) and second fitting part ( 12 ) as a relative rotation of the first fitting part ( 11 ; 311 ; 411 ; 511 ) and the second fitting part ( 12 ) with superposed wobbling motion. Fitting according to one of the preceding claims, characterized in that the driver ( 21 ) for the rotationally fixed receiving a drive shaft ( 7 ) is designed. Fitting according to one of the preceding claims, characterized in that two of a spring ( 35 ) wedge segments pressed apart ( 27 ) define the eccentric. Fitting according to one of the preceding claims, characterized in that by means of the driven by the eccentric epicyclic gear relative rolling movement between the first fitting part ( 11 ; 311 ; 411 ; 511 ) and second fitting part ( 12 ) the inclination of a backrest ( 4 ) of the vehicle seat ( 1 ) is infinitely adjustable. Vehicle seat, in particular motor vehicle seat, with A fitting according to one of the preceding claims.