WO2014114585A1

WO2014114585A1 - Height adjuster for a vehicle seat and vehicle seat

Info

Publication number: WO2014114585A1
Application number: PCT/EP2014/051002
Authority: WO
Inventors: Viktor Enns; Thomas Dill
Original assignee: Johnson Controls Components Gmbh & Co. Kg
Priority date: 2013-01-24
Filing date: 2014-01-20
Publication date: 2014-07-31
Also published as: DE102013001416B4; DE102013001416A1

Abstract

The invention relates to a height adjuster (5) for a vehicle seat (1), comprising at least one rocker (7, 9) which is pivotable about a coupling point (22, 26) relative to a side part (11), and an adjustment arm (40) which has a toothed part (42) and is pivotable about a bearing point (30), and also a pinion (32) which is rotatable about an axis of rotation (34) and interacts with the toothed part (42) for the adjustment of the height. The toothed part (42) is configured here in such a manner that, in the event of a movement of the pinion (32) relative to the toothed part (42), the distance of the axis of rotation (34) from the bearing point (30) changes, wherein the shape of the toothed part (42) is of convex or linear design. The invention also relates to a vehicle seat (1) which comprises at least one height adjuster (5) according to the invention.

Description

HEIGHT ADJUSTMENT FOR A VEHICLE SEAT AND VEHICLE SEAT

The invention relates to a height adjuster for a vehicle seat with the

Features of the preamble of claim 1. The invention also relates to a vehicle seat with the features of claim 15. Prior art

From DE 10 2009 014 376 B3 a generic height adjuster and a generic vehicle seat are 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 by means of joints with each other

connected.

The height adjuster is for height adjustment by means of a Getriebebeschlages, which is effective between two of the four gear members, and a

Drive device for the geared fitting can be driven manually. 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 DE 199 44 866 B4 a generic height adjuster is known, which also includes a four-bar linkage. In this case, the four-bar linkage has, in particular, a side part designated as the first adjusting cam and a second adjusting cam. In this case, the second Verstellarnn 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 adjustment comprises a dental arch, which in the form of a

Circular segment is formed 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 adjustment arm also experiences a pivoting movement relative to the side part. This changes the height of the vehicle seat. The moment to be transmitted by the pinion to the dental arch is not constant but depends on the instantaneous height of the vehicle seat, as shown below, among others, in the illustrations according to FIGS. 3, 4 and 5. To lift the vehicle seat is one of the wings relative to the

Seat frame, or to swing 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 required to lift the vehicle seat. The vehicle seat is in an upper position, such a pivoting movement causes a relatively small change in height and a relatively large movement in Longitudinal direction. Thus, a relatively small drive torque for further lifting of the vehicle seat is required.

OBJECT The invention is based on the object, a height adjuster and a

To improve vehicle seat of the type mentioned above, 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 15, 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.

A generic height adjuster for a vehicle seat comprises at least one rocker, which relative to a side part about a pivot point

is pivotable, and a toothed part having an adjusting arm, which is pivotable about a bearing point, and a rotatable about a rotation axis pinion, which cooperates for height adjustment with the tooth part. According to the invention, the tooth part is designed such that when the pinion moves relative to the tooth part, the distance of the rotation axis from the bearing point changes, the shape of the tooth part being convex or linear.

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

Vehicle seat required drive torque in the lower position of

Vehicle seat reduced and enlarged 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 moves

Drive means for the pinion together with the vehicle seat and thus retains the drive means at a height position their position relative to an occupant of the vehicle seat.

The bearing point of the adjusting arm is advantageously 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.

Preferably, 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 an advantageous embodiment of 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 required according to the invention

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

Likewise, preferably the adjusting arm with the toothed part is designed and arranged such that the central axis of the said

externally toothed gear lies above the bearing point of the adjustment. 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.

According to another advantageous embodiment of the invention, the tooth part is parabolic or hyperbolic.

Preferably, the tooth part forms a side facing away from the bearing edge of an introduced in the adjustment arm slot.

In this case, the pinion moves by a rotation of the pinion generated by a drive device relative to the side part along the tooth part within the slot of the adjustment.

Figures and embodiments of the invention

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 is a schematic representation of a vehicle seat, 2 is a perspective view of a seat part,

3 shows a side view of the seat part from FIG. 2 in the lower position, FIG. 4 shows a side view of the seat part from FIG. 2 in the middle position and FIG

5 shows a side view of the seat part from FIG. 2 in the upper position.

A vehicle seat 1 for a motor vehicle has a seat part 2, which has a

Seat frame 10 includes, and attached thereto, tilt adjustable

Backrest 14 on.

The arrangement of the vehicle seat 1 within the vehicle and its usual direction of travel define those used below

Directional information. In this case, a direction oriented perpendicular to the roadway is hereinafter referred to as vertical direction and a direction perpendicular to the vertical direction and perpendicular to the direction of travel is hereinafter referred to as

Transverse direction. By means of a laterally arranged, manually, in particular by means of a

Handwheel, to use Lehneneinstellbeschlags 19, the backrest 14 is tilt-adjustable, that is, the angle between the seat part 2 and the backrest 14 is adjustable. As an alternative to the handwheel, an electric drive for the backrest adjustment fitting 19 is also conceivable.

At the upper end in the vertical direction of the backrest 14, which faces away from the seat part 2, is also a height adjustable and tilt adjustable

Headrest 13 attached. By means of a longitudinal adjuster, which two with the vehicle floor of the

Motor vehicle has connected lower rails 15 and two connected to the vehicle seat 1 upper rails 17, the vehicle seat 1 is longitudinally adjustable. This means that the seat part 2 is adjustable together with the backrest 14 in the longitudinal direction, which corresponds approximately to the direction of travel. For this purpose, each of the top rails 17 is slidably guided in each case one of the parallel extending in the longitudinal direction of the bottom rails 15. Each of the two

Top rails 17 forms each with the associated bottom rail 15 a

Pair of seat rails. 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 can be locked. By means of a Entriegelungsbügels 21, the locking device can be 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 adjustable by means of a height adjuster 5 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, which is formed from a base 3, a front rocker 7, a rear rocker 9 and a side part 1 1, which are each connected by means of articulation points.

The side parts 1 1 are part of the seat frame 10, which carries a designed as a foam part seat cushion 12 and in this case also the backrest 14. The backrest 14 is formed with a foam part

Padded backrest cushion 6 and is, as well as the seat cushion 12, covered with a cover, in particular made of fabric or leather. The seat cushion 12 and the backrest cushion 6 significantly increase the seating comfort for an occupant of the vehicle seat. 1 Each base 3 of the two four joints of the height adjuster 5 is presently connected to one of the two seat rail pairs, which are part of the longitudinal adjuster, and which are fastened by means of the respective lower rail 15 to the vehicle floor of the motor vehicle. Each base 3 is connected to the respective upper rail 17 of a pair of seat rails or formed integrally with the respective upper rail 17 of the longitudinal adjuster. In the present case, the respective upper rail 17 forms the base 3 of the height adjuster 5. Alternatively, the base 3 may also be fastened directly to the vehicle floor, or the vehicle floor may form the base 3.

By means of the height adjuster 5, the height of the seat part 2 and thus also of 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 over the base 3 is adjustable. To drive the height adjuster 5 is presently a manually operated

Drive device 20 is provided. Such a drive device for a height adjuster of a vehicle seat is described, for example, in the document DE 10 2009 014 376 B3, the relevant disclosure of which is expressly incorporated by reference. Alternatively, an electric drive for the height adjuster 5 is conceivable.

On the side part 1 1 is in the front region, a first pivot point 22nd

provided on which the front rocker 7 is pivotally mounted. The base 3 comprises in the front region a front adapter 16, on which the front rocker 7 is also pivotally mounted at a second articulation point 24. On the side part 1 1, a third articulation point 26 is provided in the rear region, on which the rear rocker 9 is pivotally mounted. Likewise, the base 3 in the rear region comprises a rear adapter 18, on which the rear rocker 9 is also pivotally mounted at a fourth articulation point 28.

The articulation points 22, 24, 26, 28 are joints of the four-bar linkage of

Height adjuster 5. The center axes of the articulation points 22, 24, 26, 28 to which the rockers 7, 9 can pivot relative to the base 3 and to the side part 1 1, parallel to each other in the transverse direction.

In the present case, the articulation points 22, 24, 26, 28 each comprise a screw bolt which projects through a corresponding bore in the rockers 7, 9. Each of the said bolts is screwed into a thread, which is provided on the side part 1 1, or on one of the adapters 16, 18 of the base 3. At the rear rocker 9, a setting arm 40 is attached to a bearing 30, which is pivotally mounted about the bearing 30 relative to the rear rocker 9. The adjusting arm 40 has a toothed part 42, which is in engagement with an externally toothed pinion 32. The tooth part 42 forms a bearing 30 remote from the edge of a introduced in the adjustment arm 40 long hole.

It is also conceivable to attach the bearing point 30 of the adjusting arm 40 directly to the base 3 or to an adapter provided on the base 3. The pinion 32 is rotatably mounted on the side part 1 1 about a transverse axis of rotation 34 and is driven by the drive device 20, not shown in detail. In this case, the pinion 32 extends through the introduced in the adjustment arm 40 slot. By a generated by the drive means 20 rotation of the pinion 32 relative to the side part 1 1 about the rotation axis 34, the pinion 32 moves along the tooth portion 42 within the slot of the adjustment arm 40. As a result, the adjustment arm 40 moves relative to the side part 1 first

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 to the bearing 30 of the adjustment arm 40 changes. In particular, the shape of the

Tooth part 42 from the shape of a circular segment whose center coincides with the bearing 30, about which the adjustment arm 40 is pivotable. The third pivot point 26, the bearing 30 and the axis of rotation 34 thus form a triangle, which has two constant sides, namely on the one hand, the distance between the bearing 30 and the third pivot point 26 and on the other hand, the distance between the axis of rotation 34 and the third pivot point 26. The third side of said triangle, ie the distance between the bearing 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

In the present case, the toothed part 42 is configured in the form of a circle segment and designed as an external toothing, ie convex. The toothed part 42 can thus be considered as part of an externally toothed gear with a transverse center 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 30 and also above the axis of rotation 34th

The axis of rotation 34 is outside of said gear and has a constant distance to the central axis of said gear. The bearing 30 is outside the said gear. The distance of

Bearing 30 to the central axis of said gear depends on the height of the vehicle seat. Other forms of the tooth part 42 are conceivable. For example, that is

Tooth part 42 parabolic, hyperbolic or linear, or rectilinear, as in a straight rack, executable.

However, the toothed part 42 should not be designed in the form of an internal toothing, that is not concave. The features disclosed in the foregoing description, the claims and the drawings may be of importance both individually and in combination for the realization of the invention in its various forms.

LIST OF REFERENCE NUMBERS

vehicle seat

seat part

Base

Height adjuster

Backrest cushion

front swingarm

rear swingarm

seat frame

side panel

seat cushions

headrest

backrest

bottom rail

front adapter

upper rail

rear adapter

Lehneneinstellbeschlag

driving means

Entriegelungsbügel

first articulation point

second articulation point

third articulation point

fourth articulation point

depository

pinion

axis of rotation

adjustment arm

toothed part

Claims

Patent claims

1 . Height adjuster (5) for a vehicle seat (1), comprising

at least one rocker (7, 9), which can be pivoted relative to a side part (1 1) about an articulation point (22, 26), and

an adjusting arm (40) which has a toothed part (42) and which can be pivoted about a bearing point (30), and

a pinion (32) rotatable about an axis of rotation (34), which is used to

Height adjustment interacts with the toothed part (42),

characterized in that

the toothed part (42) is designed such that when the pinion (32) moves relative to the toothed part (42), the distance of the axis of rotation (34) from the bearing point (30) changes, whereby

the shape of the tooth part (42) is convex or linear.

2. Height adjuster (5) according to claim 1, characterized in that

the toothed part (42) is oriented in such a way that a rotation of the pinion (32) by a predetermined angle with the vehicle seat (1) in a lower position causes a smaller change in the distance of the axis of rotation (34) from the bearing point (30) than one Rotation of the pinion (32) through the same angle with the vehicle seat (1) in an upper position.

3. Height adjuster (5) according to one of the preceding claims, characterized

characterized in that the pinion (32) is mounted on the side part (1 1).

4. Height adjuster (5) according to one of the preceding claims, characterized

characterized in that the bearing point (30) of the adjusting arm (40) is attached to a rocker arm (7, 9).

5. Height adjuster (5) according to claim 4, characterized in that the at least one rocker arm (7, 9) can be pivoted relative to a base (3) about a further articulation point (24, 28).

6. Height adjuster (5) according to claim 5, characterized in that

the bearing point (30) of the adjusting arm (40) is attached between the two articulation points (22, 26; 24, 28) of the rocker arm (7, 9).

7. Height adjuster (5) according to one of the preceding claims, characterized

characterized in that the toothed part (42) is part of an externally toothed

Gear is formed.

8. Height adjuster (5) according to claim 7, characterized in that

the central axis of the gear lies above the axis of rotation (34).

9. Height adjuster (5) according to one of claims 7 or 8, characterized

characterized that the central axis of the gear above the

Bearing point (30) of the adjusting arm (40) is located.

10. Height adjuster (5) according to one of claims 7 to 9, characterized

characterized in that the axis of rotation (34) lies outside the gear.

1 1 height adjuster (5) according to one of claims 7 to 10, characterized

characterized in that the bearing point (30) of the adjusting arm (40) is outside the gear.

12. Height adjuster (5) according to one of claims 1 to 6, characterized

characterized in that the tooth part (42) is parabolic or hyperbolic.

13. Height adjuster (5) according to one of the preceding claims, characterized in that the toothed part (42) forms an edge of an elongated hole made in the adjusting arm (40) facing away from the bearing point (30).

14. Height adjuster (5) according to claim 13, characterized in that

by a rotation of the pinion (32) relative to the side part (1 1) generated by a drive device (20), the pinion (32) moves along the toothed part (42) within the elongated hole of the adjusting arm (40).

15. Vehicle seat (1), comprising at least one height adjuster (5) according to one of the preceding claims.