EP2313291A1

EP2313291A1 - Eccentric joint fitting for a vehicle seat

Info

Publication number: EP2313291A1
Application number: EP09780724A
Authority: EP
Inventors: Thomas Thiel; Reinhard Vogel; Burckhard Becker; Wilfried Beneker
Original assignee: C Rob Hammerstein GmbH
Current assignee: Johnson Controls Metals and Mechanisms GmbH and Co KG
Priority date: 2008-08-13
Filing date: 2009-07-16
Publication date: 2011-04-27
Also published as: US20110156463A1; WO2010018045A1; US8336962B2; CN102149568A

Abstract

The eccentric joint fitting for a vehicle seat has a first joint arm (20) which a) is fitted with an internally toothed gearwheel (24) and b) forms a first bearing face (26), which are central with respect to a main axis (28), and a second joint arm (20) to which an eccentric wheel (30) is assigned which a) has an externally toothed pinion (32) which is located inside the internally toothed gearwheel (24) and engages therewith, and b) has a second bearing face (34). The pinion (32) and second bearing face (34) are central with respect to an eccentric axis (36). An eccentric drive part (38) is arranged in the region between the first bearing face (26) and second bearing face (34). In a clamped state, the clamping parts (42) displace the eccentric axis (36) with respect to the main axis (28). The eccentric drive part (38) defines the eccentric. A rotary drive of the eccentric drive part (38) causes the pinion (32) to rotate with respect to the internally toothed gearwheel (24) even when the clamping parts (42) are not present, and unless the clamping parts (42) are present equalization of play is not brought about.

Description

Designation: Taumelgelenkbeschlag for a vehicle seat

The invention relates to a Taumelgelenkbeschlag for a vehicle seat with a first articulated arm, which a) carries an internal gear and b) forms a first bearing surface, wherein the internal gear and the first bearing surface are central to a main axis, with a second articulated arm, which is associated with an eccentric a) has an externally toothed pinion which is located within and is in engagement with the internal gear, and b) has a second bearing surface, wherein pinion and second bearing surface are centered to an eccentric axis, with an eccentric driving part, which in the area between the first Bearing surface and second bearing surface is arranged, and with clamping parts which move in a clamping state, the eccentric axis relative to the main axis, whereby the Taumelgelenkbeschlag is made possible backlash.

Such a Taumelgelenkbeschlag, also referred to as Getriebegelenkbeschlag is known from DE 10 2004 007 043 B3. In this prior art Taumelgelenkbeschlag are the clamping parts, which are formed as wedge segments, within the Exzentertreibteils, more precisely between the Exzentertreibteil and the first bearing surface. The wedge segments are part of the eccentric, together with the Exzentertreibteil they define the eccentric. The Exzentertreibteil is designed as a complete ring.

For further prior art, reference is made to DE 19 938 666 A1, DE 19 517 441 C1 and DE 10 2005 007 045 B3.

The second articulated arm may be rigidly connected to the eccentric wheel, but it may also be another wobble mechanism between the second articulated arm and the eccentric, whereby the tumbling motion is not felt outside the driving handwheel or motor.

A disadvantage of the Taumelgelenkbeschlag the particular type mentioned is that the clamping parts must be designed as wedge elements or wedge segments and in particular that they define the eccentric. As a result, you are limited both in the geometric design of the clamping parts and in their arrangement within the Taumelgelenkbeschlags. The wedge segments in the Taumelgelenkbeschlag of the aforementioned type have a dual function, they are both the means that balances the play and the means that defines the eccentric. Thus their position within the fitting also determines the location at which the eccentrically acting forces actually act on a drive.

This is where the invention starts. Their goal is to free the clamping parts of their dual function and use only for clearance compensation. The object of the invention is therefore to further develop the Taumelgelenkbeschlag of the type mentioned in that the clamping parts are responsible only for the clamping function and not for the eccentric function.

This object is achieved by the features of claim 1.

In this Taumelgelenkbeschlag the eccentric is defined solely by the Exzentertreibteil, the eccentric is not defined by the clamping parts. If you operate the fitting according to the invention without clamping parts, it works completely, it is only the clearance compensation lost.

The inventive design has the advantage that the clamping parts can be arranged at their optimum position within the hinge fitting. They can be optimally designed for a clamping function. They do not have to be designed as wedges, they can for example be designed as rollers, balls, clamping stilts, eccentric parts. Their shape is no longer determined by the crescent-shaped course between the eccentric drive part and either first bearing surface or second bearing surface as in the prior art, but the clamping parts can also be supported on non-round parts. This applies in particular to the geometric design of the support of the clamping parts on Exzentertreibteil. The clamping parts are now designed exclusively for the clamping function. Their design does not have to take account of the eccentric function.

The clamping parts preferably cooperate with the first bearing surface. This forms a support surface for the clamping parts. In this case, the other, more outer support surface of the clamping parts is formed on the Exzentertreibteil and does not necessarily have to be round, they can run arbitrarily within wide limits. This achieves more favorable clamping conditions. Alternatively, the clamping parts can also interact with the second bearing surface. In In this case, the other, more inboard support surface is formed on the eccentric drive and also does not necessarily have to be round, they can run arbitrarily within wide limits.

Another advantage lies in the following: The formation of the eccentric drive by the Exzentertreibteil is now cheaper. The invention enables a separation of the functions of the lash adjuster and the drive. The drive is now independent of the clamping parts. It can be positioned at the optimum angular position relative to an eccentric vector.

An eccentric vector is defined by a root located on the major axis, a peak pointing to the eccentric axis, and a direction perpendicular to the major axis. In a preferred embodiment, an eccentric region is provided, which extends in an angular range of ± 30 °, preferably ± 45 ° and in particular ± 60 ° to the eccentric vector. The eccentric area is in contact with the first bearing surface or the second bearing surface.

The clamping parts can be arranged at an angular distance from the eccentric vector, which is substantially larger than in the prior art. The angular distance is chosen so that its support function is optimized in terms of clearance compensation.

Preferably, the clamping parts are associated with the Exzentertreibteil. In this way, the clamping parts inevitably make the movement of the Exzentertreibteils. The first bearing surface and / or the second bearing surface can be cylindrical. Special guide areas or supporting flanks for the clamping parts are provided in the eccentric drive part.

Whenever there is talk of clamping parts, it is particularly important to focus on the supporting areas of the clamping parts on the one hand on the first bearing surface or on the second bearing surface and on the other hand on the eccentric driving part. The clamping parts themselves may have any shape, for example, be wedge-shaped. They can extend over a relatively large angular range, for example up to 90 °. The decisive factor is where they actually have contact on the one hand with the first bearing surface or the second bearing surface and on the other hand with the Exzentertreibteil. The location of these contact points means the location of the actual support. It is this actual support that positions arbitrarily can be. The support is such that it is optimally designed for backlash compensation when absorbing high forces. The shape of the clamping parts outside the contact points can be adapted to the respective requirements. This concerns, inter alia, the control of the clamping parts between a clamping state and a neutral state.

Conveniently, the invention Taumelgelenkbeschlag is the inclusion of high, accidental forces. In such a high load case, there is an immediate surface contact and conditioning of first bearing surface, Exzentertreibteil and second storage area. The clamping parts play virtually no role.

Further advantages and features of the invention will become apparent from the other claims and the following description of non-limiting embodiments of the invention, which are explained in more detail with reference to the drawings below. In this drawing show:

1 is a perspective view in the form of a mounting pattern of a first embodiment of the Taumelgelenkbeschlags, but without spring,

2 is a perspective view from the front, in Figure 1 from the right, on the assembled Taumelgelenkbeschlag, but without control part and without drive,

Fig. 3: a perspective view as Figure 2, but now with

Control part, also a spring is added,

4 shows a plan view similar to FIG. 3 of a second exemplary embodiment that largely corresponds to the first exemplary embodiment,

5 shows a view as in FIG. 4, for a third embodiment, in which the eccentric drive part is an enclosed ring,

6 shows a view similar to Figure 4 for a fourth embodiment, in which the clamping bodies are designed as rolling elements, and Fig. 7: a view as Figure 4 for a fifth embodiment, now the clamping body between the first bearing surface and the second bearing surface are now arranged, the Exzentertreibteil is designed as a ring and has a step.

In the following, the first exemplary embodiment according to FIGS. 1 to 3 will be explained and discussed, the further exemplary embodiments will be discussed subsequently, in which case their differences to the first exemplary embodiment will be discussed in detail. As far as conformity with the first embodiment, this is not particularly discussed. The features of all sub-claims, including the sub-features, can be combined with each other and preferably with the main claim.

The wobble joint fitting has a first link arm 20 and a second link arm 22 cooperating therewith. The first link arm 20 has an internal gear 24 and a first annular bearing surface 26. Internal gear 24 and first bearing surface 26 are central to a major axis 28. The second link arm 22 is an eccentric 30 assigned. Assignment is understood here to mean that the eccentric wheel 30 is either rigidly connected to the second articulated arm 22 or is connected to the second articulated arm 22 via a wobble mechanism similar to the illustrated wobble mechanism. The eccentric 30 proves an externally toothed pinion 32 which is in engagement with the internal gear 24 and can rotate in this tumbling. Furthermore, the eccentric 30 on a second bearing surface 34, which is also cylindrical.

In contrast to the first bearing surface 26, which is an outer surface, the second bearing surface 34 is an inner surface. The eccentric wheel 30 and thus its pinion 32 and the second bearing surface 34 are centered to an eccentric axis 36. Furthermore, the Taumelgelenkbeschlag an eccentric drive member 38 which is located in a crescent-shaped annular gap between the second bearing surface 34 and the first bearing surface 26. This Exzentertreibteil 38 has an eccentric region 40, which is responsible for the actual eccentric function. It is in abutment both on the first bearing surface 26 and on the second bearing surface 34. The rest of the region of the Exzentertreibteils 38, ie outside of the eccentric region 40, may be in contact with one of the bearing surfaces 26 or 34, but is usually not in contact with both bearing surfaces 26, 34. He is not responsible for the actual drive function.

Finally, the Taumelgelenkbeschlag clamping parts 42. In this case, a clamping part is sufficient, for symmetry reasons are usually two clamping parts, as shown. The task of the clamping parts is to move in a clamping state, the eccentric axis 36 so relative to the main axis 28 that the Taumelgelenkbeschlag is possible without play. Before the Taumelgelenkbeschlag can be adjusted, so the first articulated arm 20 can be pivoted relative to the second articulated arm 22 about the main axis 28, the clamping state of the clamping members 42 must be repealed, this is true for at least one of the clamping members 42. Such a procedure is state of the art ,

According to the invention, the eccentric drive part 38 defines the eccentric. The clamping members 42 are not part of the eccentric. Without clamping members 42 of the Taumelgelenkbeschlag works, but there is not just the described clamping state, the Taumelgelenkbeschlag is therefore not backlash. The clamping members 42 are solely for maintaining the clamping condition under control. They have no part in the eccentric function.

For better description, an eccentric vector 44 is defined. It has its base on the major axis 28. Its tip falls on the eccentric axis 30. It has a direction which is perpendicular to both axes 28, 36. Clearly speaking, it points to the thickest point of the crescent-shaped gap between the two bearing surfaces 26, 34. The eccentric vector 44 is also suitable for defining a plane of symmetry of the Taumelgelenkbeschlages. All embodiments shown are symmetrical to a plane defined by the eccentric vector 44 and one of the axles 28 and 36, respectively. This symmetry is in the clamping state, as shown in the figures. In a drive state, there is no such symmetry.

The eccentric region extends over an angle of at least ± 10 °, preferably at least ± 25 ° and in particular at least ± 30 °. In the exemplary embodiment according to FIG. 7, the eccentric region 40 extends over 360 °, ie over the entire course of the annular eccentric friction part 38. Finally, the Taumelgelenkbeschlag on a control part 46. In the drive state, it is directly or indirectly in contact with at least one of the clamping parts 42, namely the clamping part 42 which clamps in the driving direction of rotation. The control part 46 is assigned a drive 48. which is rotatably mated with the control part. The drive has a stub axle which engages in a bore of the first articulated arm 20, which is located within the first bearing surface 26.

In the first embodiment, the Exzentertreibteil 38 is substantially C-shaped, it extends over approximately 270 °. Diametrically opposite the eccentric region 40 is an air gap between the two bearing surfaces 26, 34, in this air gap engages a control lug of the control part 46 and causes the drive in a known manner.

The clamping members 42 are wedge segments in the first embodiment. They are pressed by a spring 50, which is designed in a known manner as omega spring in the clamping position. The two clamping parts 42 are identical. They extend about 100 °. They rest with an inner surface on the first bearing surface 26. With an outer surface they face an inner wall of an arm 41 of the Exzentertreibteils 38 and in Appendix. The system is preferably linear, parallel to the axes 28, 36. The clamping members 42 are designed so that the described contact and thus the support at an angle of 60 ° ± 15 ° relative to the eccentric vector 44 takes place.

Starting from the clamping state shown in Figure 4, a drive operation proceeds as follows: The control part 46 is rotated and abuts with a flank of its control nose to a narrow end of the lying in the direction of rotation of the flank clamping member 42, for example, the left in Figure 4 terminal 42. This is now moved against the force of the spring 50 in a clockwise direction and abuts with its wide end to the eccentric region 40. In the further drive movement, the eccentric drive member 38 is now moved along. As a result, the two articulated arms 20, 22 are adjusted against each other, so changed their angular position. Ends the drive, the spring 50 moves the clamping members 42 back to the starting position, this is true at least for the left clamping member 42nd The second embodiment of FIG. 4 works like the first embodiment.

In the third embodiment of Figure 5, the Exzentertreibteil 38 forms a ring. The clamping parts 42 are further located between the Exzentertreibteil 38 and the first bearing surface 26. The Exzentertreibteil 38 is composed of an eccentric region 40, which extends as in the first embodiment about 45 °, and a ring segment extending over the remaining 315 ° extends, which are necessary for a full circulation. The ring segment has contact only with the second bearing surface 34, from the first bearing surface 26 it has a distance of at least 1 to 2 mm.

The illustration of Figure 5 also applies to a modification in which the Exzentertreibteil 38 is executed differently than just described: It is now formed as a ring which extends over 360 ° and over 360 ° both at the first bearing surface 26 and abuts against the second bearing surface 34. Thus, the eccentric now extends over 360 °. The Exzentertreibteil 38 has a recess or step, in which the clamping members 42 are located. This gradation covers about 315 °. There, where in the previously described embodiment of Figure 5, the circumferentially facing flanks of over 45 ° extending eccentric were 40, now there are stages. At these stages, the clamping members 42 come alternately, depending on the direction of rotation, during an adjustment to the plant. Accordingly, the eccentric drive member 38 has two different thicknesses measured in the axial direction. It has a greater thickness in the area outside the gradation. It has a thinner thickness in the region of the gradation, that is to say in particular below the clamping parts 42 and between the narrow sides of the clamping parts 42.

In the fourth embodiment of Figure 6, the clamping members 42 are formed as balls or rolling elements. You are now not biased by an omega spring in the clamping position, but by one associated coil spring. The Exzentertreibteil 38 is composed as in the first embodiment of an eccentric 40, which now but extends over almost 90 ° and two arms 41 together, which also extend over about 90 ° and rest only on the second bearing surface 34. On their inner surfaces in each case a clamping slope for the spherical clamping members 42 is provided. The clamping slope tapers in the direction of an expanding coil spring. The balls, which form the clamping parts 42, lie between the arms 41 and the first bearing surface 26. The control part fills substantially the rest of the gap between the bearing surfaces 26, 34 and engages with adjusting fingers in the vicinity of the balls, the clamping parts 42nd form. Furthermore, the control member 46 has a recess which can come into contact with the free ends of the arms 41 of the Exzentertreibteils 38. During a rotational movement of the control part 46, first the finger 51 lying in the direction of movement first releases the adjacent ball from the clamping position, after which the eccentric drive part 38 is rotated. Accordingly, the distance between the finger 51 and the ball 42 is smaller than the distance between the recess and the free end of one of the arms 41.

In particular, with reference to the embodiment of Figure 6 it is clear that any clamping parts can be used.

Finally, the embodiment according to FIG. 7, that is to say the fifth exemplary embodiment, will be discussed. Here, the now wedge-shaped clamping members 42 are arranged in a different plane than the Exzentertreibteil 38. The Exzentertreibteil 38 is a closed ring, which is located below the clamping members 42. Thus, the eccentric 40 extends over 360 °. The Exzentertreibteil 38 has a projecting into the plane of the clamping members 42 driver 52, which is located at the position of the eccentric portion 40 of the first embodiment. He has the same driving function as the latter. The control part 46 is not shown, it is carried out similarly to the first embodiment, but extends over a larger angular range, so that it can interact with the narrow sides of the clamping members 42. The clamping parts 42 extend over a smaller angle, for example about 60 °, and are thus shorter than in the first embodiment. The clamping members 42 are in abutment both on the first bearing surface 26 and on the second bearing surface 34. So they act directly between these two bearing surfaces 26, 34, without participation of Exzentertreibteils 38. In a known manner, a sliding ring 54 is still provided is inserted into the first bearing surface 26 and assumes their function.

Claims

claims

1. wobble joint fitting for a vehicle seat with a first articulated arm (20) which a) carries an internal gear (24) and b) a first bearing surface (26), wherein the internal gear (24) and first bearing surface (26) centered to a main axis (26 28), with a second articulated arm (20) associated therewith an eccentric wheel (30) having: a) an externally toothed pinion (32) located within and in engagement with the internal gear (24), and b ) has a second bearing surface (34), wherein pinion (32) and second bearing surface (34) are centered to an eccentric axis (36), with an eccentric drive part (38) in the region between the first bearing surface (26) and second bearing surface (34 ) is arranged, and with clamping members (42) which move the eccentric axis (36) relative to the main axis (28) in a clamping state, whereby the Taumelgelenkbeschlag is made possible backlash, characterized in that the Exzentertreibteil (38) define the eccentric rt and an eccentric region (40) which rests with production-related play on the first bearing surface (26) and the second bearing surface (34), and that a rotary drive of the Exzentertreibteils (38) rotation of the pinion (32) relative to the internal gear (24 ) causes, even without the presence of the clamping parts (42), wherein without the presence of the clamping parts (42) only no clearance compensation is achieved.

2. Taumelgelenkbeschlag claim 1, characterized in that an eccentric vector (44) has a foot point which lies on the main axis (28), has a tip which points to the eccentric axis (36) and has a direction which is perpendicular to the main axis ( 28), and that the eccentric region (40) is in an angular range of at least + - 10 degrees, preferably at least + - 25 degrees and in particular at least + - 30 degrees, in each case with respect to the eccentric vector (44).

3. Taumelgelenkbeschlag according to one of the preceding claims, characterized in that a control part (46) is provided, via which the Exzentertreibteil (38) is driven.

4. Taumelgelenkbeschlag according to one of the preceding claims, characterized in that the Exzentertreibteil (38) is either annular or extending over less than 360 ° degrees, but more than 180 ° degrees.

5. Taumelgelenkbeschlag according to one of the preceding claims, characterized in that the clamping parts (42) between the Exzentertreibteil (38) and either the first bearing surface (26) or the second bearing surface (34) are located.

6. Taumelgelenkbeschlag according to one of claims 1 to 4, characterized in that the clamping parts (42) against the first bearing surface (26) and / or on the second bearing surface (34).

7. Taumelgelenkbeschlag according to one of the preceding claims, characterized in that a first clamping part a support at an angle of plus 60 ° degrees + - 15 ° degrees and a second clamping part a support at an angle of minus 60 ° degrees + - 15 ° degrees , in each case based on the eccentric vector (44) causes.

8. Taumelgelenkbeschlag claim 1, characterized in that the clamping parts (42) in the region between the first bearing surface (26) and the second bearing surface (34) are arranged.