DE102013001416B4 - Height adjuster for a vehicle seat and vehicle seat - Google Patents

Abstract

Height adjuster (5) for a vehicle seat (1), comprising at least one rocker arm (9) which is pivotable about a pivot point (26) relative to a side part (11), and an adjusting arm (40) having a toothed part (42) Bearing (30) is pivotable, andein about a rotational axis (34) rotatable pinion (32) which cooperates for height adjustment with the toothed part (42), wherein the toothed part (42) is designed such that upon movement of the pinion (32) relative to the tooth part (42) the distance of the rotation axis (34) from the bearing point (30) changes, characterized in that the shape of the tooth part (42) is convex and the tooth part (42) is formed as part of an externally toothed gear wherein the central axis of the gear is above the axis of rotation (34), and that the bearing point (30) of the adjusting arm (40) is mounted on the at least one rocker (9) and the at least one rocker (9) relative to a base (3 ) around a white tere articulation point (28) is pivotable, wherein the bearing point (30) of the adjusting arm (40) between the two articulation points (26; 28) of the at least one rocker (9) is mounted.

Description

The invention relates to a height adjuster for a vehicle seat having the features of the preamble of claim 1. The invention also relates to a vehicle seat having the features of claim 6.

State of the art

From the DE 10 2009 014 376 B3 are a generic height adjuster and a generic vehicle seat known. The height adjuster has on each side of the vehicle seat depending on a four-bar linkage, wherein each four-bar link of a base, a front rocker, a rear rocker and a seat frame is formed. The gear members, so the base, the front rocker, the rear rocker and the seat frame are connected by means of joints.

The height adjuster is manually drivable for height adjustment by means of a gear shifter, which is effective between two of the four gear members, and a drive means for the geared fitting. When the transmission fitting is driven by means of the drive device, it pivots two of the transmission elements relative to one another. By this pivoting movement, the distance of the seat frame changes over the base and thus the height of the vehicle seat.

Also from the DE 199 44 866 B4 is a generic height adjuster known, which also includes a four-bar linkage. The four-bar linkage has in particular a side part designated as the first adjusting arm and a second adjusting arm. In this case, the second adjusting arm is pivotable about an axis relative to the side part. The second adjustment is also connected to a rocker of the height adjuster.

The second adjusting arm comprises a dental arch, which is designed in the form of a circular segment, which extends centrally about the axis about which the second adjusting arm is pivotable relative to the side part. The dental arch is in engagement with a pinion, which is rotatably mounted on the side part and driven by a drive means.

By a generated by the drive means rotation of the pinion relative to the side part of the second adjusting arm undergoes a pivoting movement relative to the side part. As a result, the rocker of the height adjuster connected to the second adjusting arm also experiences a pivoting movement relative to the side part. This changes the height of the vehicle seat.

The torque to be transmitted by the pinion to the dental arch is not constant but depends on the instantaneous height of the vehicle seat, as is apparent inter alia from the illustrations 3 . 4 and 5 evident. For lifting the vehicle seat one of the rockers is to pivot relative to the seat frame, or to the base.

If the vehicle seat is in a lower position, such a pivoting movement causes a relatively large change in height and a relatively small movement in the longitudinal direction. Thus, a relatively large drive torque for lifting the vehicle seat is required. If the vehicle seat is in an upper position, such a pivoting movement causes a relatively small height change and a relatively large movement in the longitudinal direction. Thus, a relatively small drive torque for further lifting of the vehicle seat is required.

From the DE 10 2008 051 596 A1 a height adjuster is known for a vehicle seat, comprising a front rocker which is pivotable relative to a seat frame side part about a first pivot point and relative to a base about a second pivot point, and a rack connector whose first end has a linear rack and the second end pivotally is connected to the second articulation point, and a mounted on the seat frame side part pinion, which cooperates for height adjustment with the rack. The rack connector acts as a pull rod. Upon rotation of the pinion and consequent relative movement of the rack, the front rocker is pivoted by the pinion pulls the side member by means of the rack connecting piece in another position. This also changes the height of the seat frame.

The DE 10 2011 001 638 A1 discloses a height adjuster for a vehicle seat, comprising a rocker, which is pivotable about a pivot point relative to a side part, and a toothed part having an adjusting arm, which is pivotable about a bearing point, and about a rotation axis rotatable pinion, which for height adjustment with the tooth part cooperates, wherein the toothed part is designed such that upon movement of the pinion relative to the toothed part of the distance of the axis of rotation changes from the bearing point. The shape of the tooth part is concave. A central axis of the tooth part lies above the axis of rotation of the pinion.

The US 7,828,384 B2 discloses a height adjuster for a vehicle seat, comprising a rocker, which is about a relative to a side part Anlenkstelle is pivotally, and a Einstellarm, which is pivotable about a first bearing point to the rocker and about a second bearing point to a convex tooth arch part. The toothed arch part is drivable by a pinion and drives the adjusting arm.

task

The invention is based on the object to improve a height adjuster and a vehicle seat of the type mentioned, and in particular to obtain an approximately uniform course of the required drive torque regardless of the current height of the vehicle seat.

solution

This object is achieved by a height adjuster with the features of claim 1 and by a vehicle seat with the features of claim 6, which comprises a height adjuster according to the invention.

Advantageous embodiments, which can be used individually or in combination with each other, are the subject of the dependent claims.

An inventive height adjuster for a vehicle seat comprises at least one rocker, which is pivotable about a pivot point relative to a side part, and a toothed part having an adjustment, which is pivotable about a bearing point, and about a rotation axis rotatable pinion, which for height adjustment with the tooth part interacts. In this case, the toothed part is designed such that when a movement of the pinion relative to the toothed part of the distance of the rotational axis of the bearing changes, wherein the shape of the toothed part is convex or linear.

The tooth part is preferably oriented such that at a lower position of the vehicle seat rotation of the pinion causes a relatively small change in the distance of the axis of rotation of the bearing point by a predetermined angle, while at an upper position of the vehicle seat rotation of the pinion to the same Angle causes a relatively large change in the distance of the axis of rotation of the bearing.

As a result of this configuration of the tooth part, the drive torque required for lifting the vehicle seat is reduced in the lower position of the vehicle seat and increased in the upper position of the vehicle seat. Thus, an approximately uniform course of the required drive torque is independent of the current height of the vehicle seat to achieve.

According to an advantageous embodiment of the invention, the pinion is mounted on the side part. As a result, the pinion and thus also the drive means for the pinion moves together with the vehicle seat and thus the drive means retains its position at a height position relative to an occupant of the vehicle seat.

The bearing point of the adjustment is inventively mounted on a rocker, which is pivotable relative to the side part. By such an arrangement, a more even course of the required drive torque can then be achieved.

According to the invention, the at least one rocker is pivotable about a further articulation point relative to a side opposite the side part, wherein the bearing point of the adjusting arm is mounted between the two articulation points of the rocker.

According to the invention, the tooth part is formed as part of an externally toothed gear. Such a tooth part in the form of a circular segment is relatively easy to produce in terms of production and has the geometric properties required according to the invention.

According to the invention, the adjusting arm with the toothed part is designed and arranged such that the central axis of said externally toothed toothed wheel lies above the axis of rotation of the pinion.

Likewise, the adjusting arm with the toothed part is preferably designed and arranged such that the central axis of the said externally toothed toothed wheel lies above the bearing point of the adjusting arm.

Advantageously, the axis of rotation of the pinion is outside of said external gear.

Likewise, advantageously, the bearing point of the adjusting is outside of said external gear.

list of figures

• 1: eine schematische Darstellung eines Fahrzeugsitzes,
• 2: eine perspektivische Ansicht eines Sitzteils,
• 3: eine Seitenansicht des Sitzteils aus 2 in unterer Position,
• 4: eine Seitenansicht des Sitzteils aus 2 in mittlerer Position und
• 5: eine Seitenansicht des Sitzteils aus 2 in oberer Position.

In the following the invention is explained in more detail with reference to an advantageous embodiment shown in FIGS. However, the invention is not limited to this embodiment. Show it:

• 1 : a schematic representation of a vehicle seat,
• 2 a perspective view of a seat part,
• 3 : a side view of the seat part 2 in lower position,
• 4 : a side view of the seat part 2 in middle position and
• 5 : a side view of the seat part 2 in upper position.

A vehicle seat 1 for a motor vehicle has a seat part 2 which is a seat frame 10 includes, and an attached, tilt-adjustable backrest 14 on.

The arrangement of the vehicle seat 1 Within the vehicle and its usual direction of travel define the directional information used below. In this case, a direction oriented perpendicular to the roadway is referred to below as a vertical direction and a direction perpendicular to the vertical direction and perpendicular to the direction of travel is referred to below as the transverse direction.

By means of a laterally arranged, manually operated, in particular by means of a handwheel, Lehneneinstellbeschlags 19 is the backrest 14 tilt adjustable, that means the angle between the seat part 2 and the backrest 14 is adjustable. As an alternative to the handwheel is also an electric drive for Lehneneinstellbeschlags 19 conceivable.

At the vertically upper end of the backrest 14 which is the seat part 2 is remote, is also a height adjustable and tilt adjustable headrest 13 appropriate.

By means of a Längseinstellers, which two connected to the vehicle floor of the motor vehicle Unterschienen 15 as well as two with the vehicle seat 1 connected top rails 17 has, is the vehicle seat 1 along adjustable. That means the seat part 2 is together with the backrest 14 in the longitudinal direction, which corresponds approximately to the direction of travel, adjustable. This is each of the top rails 17 in each case one of the parallel longitudinally extending lower rails 15 slidably guided. Each of the two top rails 17 forms each with the associated lower rail 15 a seat rail pair. The longitudinal adjuster thus comprises two parallel seat rail pairs.

By means of a locking device, each of the two upper rails with the respective lower rail 15 lockable. By means of an unlocking bracket 21 the locking device is unlocked. Alternatively, an electric drive is also conceivable here.

The longitudinal direction is perpendicular to the transverse direction, but present slightly inclined relative to the direction of travel, and thus also approximately perpendicular to the vertical direction.

The vehicle seat 1 is by means of a height adjuster 5 adjustable in height. The height adjuster 5 of the vehicle seat 1 has in this case on both vehicle seat sides depending on a four-bar linkage, which consists of a base 3 , a front swingarm 7 , a rear swingarm 9 and a side part 11 is formed, each by means of articulation points 22 . 24 . 26 . 28 connected to each other.

The side parts 11 are part of the seat frame 10 , which is designed as a foam part seat cushion 12 and in the present case also the backrest 14 wearing. Also the backrest 14 is with a trained as a foam part backrest cushion 6 upholstered and is, as well as the seat cushion 12 , covered with a cover, in particular of fabric or leather. The seat cushion 12 as well as the backrest cushion 6 thereby significantly increase the seating comfort for an occupant of the vehicle seat 1 ,

Every base 3 the two four-links of the height adjuster 5 is in this case connected to one of the two pairs of seat rails, which are part of the longitudinal adjuster, and which by means of the respective lower rail 15 are attached to the vehicle floor of the motor vehicle. There is every basis 3 with the respective upper rail 17 a seat rail pair connected or in one piece with the respective upper rail 17 formed of the longitudinal adjuster. In the present case forms the respective upper rail 17 the base 3 of the height adjuster 5 , Alternatively, the base 3 Also be attached directly to the vehicle floor, or the vehicle floor can be the base 3 form.

By means of the height adjuster 5 is the height of the seat part 2 and thus also the seat cushion 12 and present at the same time the backrest 14 of the vehicle seat 1 above the vehicle floor and thus also above the base 3 adjustable. To drive the height adjuster 5 is presently a manually operated drive device 20 intended. Such a drive device for a height adjuster of a vehicle seat is for example in the document DE 10 2009 014 376 B3 described, the related disclosure of which is expressly incorporated. Alternatively, an electric drive for the height adjuster 5 conceivable.

At the side part 11 is in the front area a first articulation point 22 provided, on which the front rocker 7 is pivotally mounted. The base 3 includes in the front area a front adapter 16 at which the front swingarm 7 at a second point of articulation 24 is also pivotally mounted. At the side part 11 is in the rear area a third articulation point 26 provided on which the rear rocker 9 is pivotally mounted. Likewise, the base includes 3 in the rear area a rear adapter 18 at which the rear swingarm 9 at a fourth point of articulation 28 is also pivotally mounted.

The articulation points 22 . 24 . 26 . 28 are joints of the four-link of the height adjuster 5 , The center axes of the articulation points 22 . 24 . 26 . 28 around which the wings swing 7 . 9 relative to the base 3 as well as to the side part 11 can pivot, parallel to each other in the transverse direction.

The articulation points 22 . 24 . 26 . 28 in the present case each comprise a screw bolt, which has a corresponding hole in the rocker arms 7 . 9 projects through. Each of the said bolts is screwed into a thread which on the side part 11 , or on one of the adapters 16 . 18 the base 3 is provided.

At the rear swingarm 9 is at a storage location 30 a setting arm 40 attached, which is around the depository 30 relative to the rear swingarm 9 is pivotally mounted. The adjustment arm 40 has a tooth part 42 on, which with an externally toothed pinion 32 engaged. The tooth part 42 forms one of the depository 30 opposite edge of a in the adjustment 40 introduced slot.

The pinion 32 is on the side panel 11 about a transverse axis of rotation 34 rotatably mounted and is of the drive device not shown in detail 20 drivable. This penetrates the pinion 32 that in the adjustment arm 40 introduced slot. By one of the drive device 20 generated rotation of the pinion 32 relative to the side panel 11 around the axis of rotation 34 the pinion moves 32 along the tooth part 42 within the slot of the adjustment arm 40 , This moves the adjustment arm 40 relative to the side panel 11 ,

The tooth part 42 is designed such that during a movement of the pinion 32 relative to the tooth part 42 the distance of the axis of rotation 34 to the depository 30 of the adjustment arm 40 changes. In particular, the shape of the tooth part deviates 42 from the shape of a circle segment whose center point with the bearing point 30 coincides with which of the adjustment 40 is pivotable.

The third point of articulation 26 , the depository 30 and the rotation axis 34 thus form a triangle, which two constant sides, namely on the one hand, the distance between the bearing 30 and the third point of articulation 26 and on the other hand, the distance between the axis of rotation 34 and the third point of articulation 26 having. The third side of said triangle, that is the distance between the depository 30 and the axis of rotation 34 , is variable in length. A change in length of said variable-length side then causes a change in the height of the vehicle seat 1 ,

The tooth part 42 is presently configured in the form of a circular segment and as external teeth, ie convex executed. The tooth part 42 Thus, it can be considered as part of an externally toothed gear having a transverse central axis. The center of the said circle segment, which coincides with the central axis of said gear, is present in the vertical direction always above the bearing point 30 and also above the axis of rotation 34 ,

The rotation axis 34 is outside of said gear and has a constant distance to the central axis of said gear. Also the depository 30 is outside of said gear. The distance of the bearing 30 to the center axis of the said gear is the height of the vehicle seat 1 dependent.

LIST OF REFERENCE NUMBERS

1

vehicle seat

2

seat part

3

Base

5

Height adjuster

6

Backrest cushion

7

front swingarm

9

rear swingarm

10

seat frame

11

side panel

12

seat cushions

13

headrest

14

backrest

15

bottom rail

16

front adapter

17

upper rail

18

rear adapter

19

Lehneneinstellbeschlag

20

driving means

21

Entriegelungsbügel

22

first articulation point

24

second articulation point

26

third articulation point

28

fourth articulation point

30

depository

32

pinion

34

axis of rotation

40

adjustment arm

42

toothed part

Claims (6)

Height adjuster (5) for a vehicle seat (1), comprising at least one rocker arm (9) which is pivotable about an articulation point (26) relative to a side part (11) and an adjusting arm (40) having a toothed part (42) about a bearing point (30) is pivotable, and about a rotation axis (34) rotatable pinion (32) which cooperates for height adjustment with the tooth part (42), wherein the tooth part (42) is designed such that upon movement of the pinion (32) relative to the tooth part (42) the distance of the rotation axis (34) from the bearing point (30) changes, characterized in that the shape of the tooth part (42) is convex and the tooth part (42) as part of an externally toothed Gear is formed, wherein the central axis of the gear is above the axis of rotation (34), and that the bearing point (30) of the adjusting arm (40) on the at least one rocker (9) is mounted and the at least one rocker (9) relative to a Base (3) to egg ne further articulation point (28) is pivotable, wherein the bearing point (30) of the adjusting arm (40) between the two articulation points (26; 28) of the at least one rocker (9) is mounted. Height adjuster (5) to Claim 1 , characterized in that the pinion (32) is mounted on the side part (11). Height adjuster (5) according to one of Claims 1 or 2 , characterized in that the central axis of the gear is above the bearing point (30) of the adjusting arm (40). Height adjuster (5) according to one of Claims 1 to 3 , characterized in that the axis of rotation (34) is outside of the gear. Height adjuster (5) according to one of Claims 1 to 4 , characterized in that the bearing point (30) of the adjusting arm (40) is outside the gear. Vehicle seat (1) comprising at least one height adjuster (5) according to one of the preceding claims.

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