EP0809747A1

EP0809747A1 - Pane guide for a lowerable spherically curved window pane in a vehicle door

Info

Publication number: EP0809747A1
Application number: EP96903889A
Authority: EP
Inventors: Horst Weber; Gerhard Hofmann
Original assignee: Brose Fahrzeugteile SE and Co KG
Current assignee: Brose Fahrzeugteile SE and Co KG
Priority date: 1995-02-14
Filing date: 1996-02-13
Publication date: 1997-12-03
Anticipated expiration: 2016-02-13
Also published as: BR9606952A; CN1174586A; IN185471B; EP0809747B1; US5946860A; KR19980702289A; MX9706215A; WO1996025580A1; CN1071833C; DE19504781C1; JPH11500796A; DE59600385D1; KR100253989B1; ES2122797T3

Abstract

The invention concerns a pane guide for a spherically curved window pane which can be lowered in the door shaft of a vehicle door, forms part of a notional enveloping surface which is barrel-shaped along the vehicle's longitudinal axis, and can be introduced in the direction of the vehicle's longitudinal axis through a double-stranded cord window raiser mounted in the door shaft. The guide tracks have a first and a second curvature matching the pane curvature at right angles to the vehicle's direction of motion, so that an additional pivoting motion about a pivoting point (P, P', p'', p''') situated at a distance from the leading edge (10r, 10r', 10r'', 10r''') of the pane (1, 1o, 1u, 1', 1'', 1''') along the X-direction, said additional pivoting motion keeping the pane's bottom edge parallel, is superimposed on the sliding motion of the pane (1, 1o, 1u, 1', 1'', 1'''). The notional barrel-shaped enveloping surface (2o, 2u) on which the pane (1, 1o, 1u, 1', 1'', 1''') slides pivots simultaneously in the sliding direction of the pane (1, 1o, 1u, 1', 1'', 1''') and, as the pane slides between the extreme positions, three points on the pane (1, 1o, 1u, 1', 1'', 1''') are always on the barrel-shaped envelope (2o, 2u) which is associated with the pane (1, 1o, 1u, 1', 1'', 1''') in one of the extreme positions.

Description

Window guide for a lowerable spherically curved window in a vehicle door

description

The invention relates to a pane guide for a spherically curved window pane, which can be lowered into a door shaft according to the preamble of patent claim 1. It is made possible by a special design of the guide rails of a double-strand cable window lifter and possibly by small, usually adaptations in the vehicle body which can be achieved without additional costs and ideally also on the guide contour of the window pane, the replaceability of cable window lifters which, because of their strict parallel deduction, are generally not suitable for lifting and lowering window panes whose curvature radii are in the range of Distinguish considerably between the guide rails.

From DE 40 08 229 AI a device for lifting and lowering a vehicle window pane with two closed, oppositely rotating cable loops is known, wherein two cable drums are mounted on separate parallel axes and are in frictional or positive engagement with one another. One of the two rope drums is driven by a manual or electrical unit. Each the two rope loops are guided along a substantially vertical guide rail via rope deflections provided at their ends.

According to an embodiment variant of this device, a combination of cable drums with different diameters is provided, as a result of which a corresponding transmission ratio is created between the two cable loops. This makes it possible to adapt the window lifter to the special withdrawal conditions of spherically curved window panes. The guide rail with the lower displacement speed and the smaller displacement path will be arranged on the side of the smaller disc radius, and the guide rail with the higher displacement speed and the larger displacement path of the driver will be arranged on the side of the larger disc radius.

A disadvantage, however, is the comparatively great technical outlay that is required in order to adjust strongly spherically curved window panes with the window lifter described above. The double execution of rope loop and rope drum leads to significantly higher costs.

The adjustment of spherically curved window panes by means of a conventional double-strand cable window lifter, which has two guide rails with an adapted curvature and whose drivers (gliders) travel the same length during the actuation of the window lifter, cause a tilting movement when the window pane is lowered, which leads to one forceful contact of the window pane leads to the door shaft in at least one point. This leads to tension in the window lift system and in the door body. Furthermore, it is disadvantageous that the increased system friction requires an increased drive torque and thus the use of stronger and more expensive motors.

The object of the invention is to further develop a vehicle door with a double-strand cable window lifter in such a way that a sufficiently exact parallel removal of the lower edge of the pane is ensured even in the case of strongly spherically curved window panes. This further development should be achieved without expensive additional measures or additional parts.

According to the invention the object is achieved by the characterizing features of patent claim 1. The subclaims describe preferred variants of the invention.

Starting from a conventional guide rail bent in the Y direction, that is to say adapted to the disc curvature, the guide rail according to the invention additionally has a curvature transverse to the direction of displacement. The design of the guide rails curved in two axes (directions) is selected such that the sliding movement of the window pane is additionally superimposed by a pivoting movement about a point (pole) spaced from the leading edge of the window pane. This can be explained by the fact that the fictitious barrel-shaped envelope surface, of which the spherically curved window pane is a component, simultaneously pivots in the direction of displacement when the window pane is moved. This means that, for example, when the window pane is lowered, the fictitious barrel-shaped envelope surface also pivots downward. By these means, the invention ensures that the window pane after Leaving their ideal, homogeneous position in the envelope surface of the closed disc position always lies with three points on this barrel-shaped (initial) envelope surface and thus executes an almost ideal displacement movement.

The majority of technical applications will require a non-stationary pivot point for the displacement of the barrel-shaped window pane; usually the pivot point will be a migratory instantaneous pole.

The position of the instantaneous pole and in particular its distance from the leading edge of the window pane is dependent on many parameters. The main influencing factors are:

- the barrel shape (more cylindrical or more spherical),

- the withdrawal line of the window pane (it can coincide with the cutting edge of the pane - usually on the B-pillar side),

the angular deviation of the withdrawal line from the Z axis of the barrel-shaped envelope surface in the X direction,

- the disc stroke and

- The position of the window pane regarding the mirror-symmetrical Z-axis of the barrel-shaped envelope. It is currently not possible to specify the quantitative effects of the above influencing variables on the position of the migratory instantaneous pole. Iterative construction methods appear most suitable for the design of the vehicle door according to the invention. Basically, the following can be assumed:

- The more the barrel shape approaches a sphere, i.e. deviates from the cylindrical shape, the more the disk swivels and the smaller the radius R of a disk leading edge if the disk is not cut by the mirror-symmetrical axis of the barrel.

- The greater the angle between the pull-off line of the window pane and the vertical Z axis, the greater the forward displacement of the pane in the X direction of smaller barrel radii and thus the degree of pivoting of the pane (from the X axis ).

- The greater the disc stroke (ie the greater the angle of rotation on the barrel-shaped envelope surface), the greater the pivoting of the window pane during the adjustment process (from the X axis).

- The further the window pane is from the mirror-symmetrical axis, the stronger it is in the area of greater curvature of the barrel shaped envelope surface, the stronger the pivoting behavior of the window pane (from the X axis).

According to a preferred variant of the invention, the guide contour of the window pane is adapted to its pivoting movement by being curved. The A- or B-pillar-side pane edge acts as the guide contour of the front window pane, and the B- or C-pillar-side pane edge is used as a guide contour for the rear window panes. The assigned guide contour of the guide rail has a matching, i.e. opposite arched curvature. The curvatures largely form the section of a circle on which two reference points (e.g. upper and lower corner point of the leading edge of the window pane) are displaced during the actuation of the window lifter.

Provided that the swivel angle of the barrel-shaped envelope is only small and the "ideal" curvature of the leading edge of the window pane e.g. only a deviation of approx. 1 mm from a straight line can be dispensed with a curved guide edge. Most of the time, the guiding profile of the door body can conceal the resulting minor gaps.

Since both the projection of the guide rails into the XZE plane results in a circular arc-shaped contour and the contour of the guide rails projected into the YZ plane is curved, the guide rails have an implied helical design. As a result, it comes when moving the window pane to a superimposition of the pivoting movement of the window pane, which is essentially in the Z direction, and its forward displacement in the X direction.

The invention is suitable for shifting all spherically curved window panes, especially when low-cost double-strand cable window lifters are to be used to the exclusion of material-intensive special constructions. A borderline case of the invention exists when the mirror-symmetrical axis (parallel to the Z axis) of the fictitious barrel-shaped envelope surface divides the window pane approximately in the middle. In this special case, the window pane would not perform any tilting movement and can be adjusted easily with a conventional double-strand cable window lifter.

The invention is explained in more detail below with reference to the figure shown. Show it:

Figure la - a side view of a spherically curved window pane in its uppermost position with an associated fictitious barrel-shaped envelope surface in the non-pivoted or pivoted position when the window pane is moved according to the invention;

Figure lb - a schematic representation of the view of Figure la from the X direction; FIG. 2a shows a side view of a spherically curved window pane in its uppermost and lowest position when the window pane is moved by means of a cable window lifter according to the prior art;

Figure 2b is a schematic representation of the view of Figure 2a from the X direction;

FIG. 3 - as in FIG. 1 a, but with additional displacement of the window pane in the X direction and with a concavely cut guide contour of the window pane;

Figure 4a - as Figure 3, but with three additional intermediate positions of the window pane;

Figure 4b - an enlarged section of Figure 4a to illustrate the invention in a greatly exaggerated representation of the pivot angle between the upper and lower positions of the fictitious barrel-shaped envelope surface and the associated pivoting range of the window pane and

Figure 5 - a side view of a mirror-symmetrical barrel-shaped envelope with two side windows of a motor vehicle.

The invention is based on a generally known double-strand cable window lifter, which essentially consists of a closed cable loop, which is connected via a cable drum connected to a drive and via two cable circumferences. steering pairs is guided at the ends of parallel guide rails. Slidable slides, which can be connected to the window pane, are mounted on the guide rails.

According to the invention, the guide rails are provided with a curvature both in the X-Z plane and in the Y-Z plane; in such a way that, depending on the position of the window pane on a fictitious barrel-shaped envelope surface, the window pane is executed a pivoting movement parallel to the lower pane edge during the displacement movement. There are always three points on the window pane on the barrel-shaped envelope that is assigned to the window starting position.

The schematic representation of FIG. 1 a shows the side view of a spherically curved window pane lo.lu in the two end positions in a motor vehicle door. In the upper end position of the window pane lo, this is part of a fictitious barrel-shaped envelope surface 2o, the rotationally symmetrical axis 20o of which runs parallel to the lower pane edge lOu. Because this window pane lo, lu is to ensure a vertical withdrawal, the side pane edges 101, lOr are trimmed so that they run parallel to the mirror-symmetrical axis 30o, 30u of the barrel-shaped envelope surface 2o, 2u assigned to them.

When the window pane is lowered into its lower end position position lu, the fictitious barrel-shaped envelope surface 2o apparently pivots into the lower position of the envelope surface 2u, the apparent pivot point being at the intersection S of the two axes 20o and 20u. The window pane lo, lu also performs a swiveling movement with the same Angle off. In the lower position of the window pane lu, it still has three points of contact with the associated fictitious envelope surface 20. Due to the geometric conditions according to the invention when a spherically curved window pane lo.lu is moved on the fictitious envelope surface 2o, the lower edge of the pane lOu can be guided in parallel, which is a prerequisite for the smooth use of a double-strand cable window lifter with only one closed cable loop. Thus, the envelope surface 2o pivots during the displacement movement with the window pane lo, lu into the position of the envelope surface 2u. This is the only way to ensure that the pane stroke H is guaranteed with a double-strand cable window lifter without tension in the lifter system or the door.

At this point it should be pointed out that the lower pane edge 10 of the window pane 10 can also be at an angle to the axis 20o of the envelope surface 2o. However, this does not change the fact that the lower edge of the pane 10 u runs parallel to one another in each pane position.

FIG. 1b schematically shows the view of FIG. La from the X direction, the surface of the spherically curved window panes lo, lu projected in this direction being darkly tinted. The parallel course of the lower pane edge lOu of the window pane lo to the lower pane edge lOu of the window pane lu can also be clearly seen after it has been displaced by the stroke H. Furthermore, it can be seen from the schematic illustration in FIG. 1b that the window pane 10 in its upper position is assigned to the upper, non-pivoted barrel-shaped envelope surface 20. This envelope surface 2o is indicated represented by the respective upper circle 2go of the two circles with the large diameter and the associated circle 2ko of smaller diameter, it being assumed that the barrel-shaped envelope surfaces 2o are cut directly along the side disk edges 101, 10or.

Since, by definition, it was assumed that the window pane lo, exactly reproduces a part of the assigned fictitious barrel-shaped envelope surface 2o in its upper end position, its side pane edges 101, 10or coincide with the contours of the circles 2go, 2ko, which form the upper barrel-shaped envelope surface 2o belong with their rotation axis 20o. However, it must be pointed out that a simplifying and at the same time exaggerated representation had to be chosen to clarify the invention. As a result, the position of the corner points of the window pane lu could not be represented in the real situation. It should be noted that when the window pane lo, lu moves, its corner points move in the X direction and thus come to rest on larger or smaller radii of the envelope surface 20.

The reference number 20u denotes the exit point of the rotation axis 20u from the small circular end face lying in the X direction. In the lower position of the window pane 1u, its surface does not form a homogeneous area with the pivoted envelope surface 2u. In comparison to the previously described exemplary embodiment, FIGS. 2a and 2b show analog representations which relate to a window pane lo, lu which can be adjusted by a cable window lifter, as would be done by the window lifter according to DE-Al 40 08 229 explained in the introduction to the description.

A shift of the window pane lo, lu accordingly takes place on one and the same barrel-shaped envelope surface 2, a certain angular rotation being carried out on the envelope surface. The window pane lo.lu inevitably travels a larger distance than the left pane edge 101 in the area of its right pane edge lOr, which acts as a leading edge. This corresponds to different stroke lengths Hl and Hr, which ultimately results in an angular position between the The lower pane edge 10 of the window pane 10 in its upper position and the lower pane edge 10 of the window pane 10 in its lower position result.

Because of the inclined position of the right-hand window edge 10, which acts as a pull-off edge (pull-off line), there is at the same time a forward displacement in the X direction during a sliding movement of the window pane.

It can also be clearly seen in FIG. 2b that the lower window edges lOu of the window panes lo and lu do not run parallel due to different stroke lengths H1 and Hr (compare FIG. 1b). FIG. 3 again shows an embodiment variant according to the invention which largely corresponds to FIG. However, no vertical withdrawal direction for the window pane lo parallel to the Z axis was chosen, but a withdrawal line running at an angle to the Z axis. However, this withdrawal line does not describe a straight line as usual, but rather a circular arc as a result of the pivoting movement of the window pane lo, lu during the displacement process. A correspondingly adapted trimming of the leading edge lOr with the radius R enables exact disc guidance if the body-side guiding regions have a corresponding convex design.

In order to clarify the problem of the wandering instantaneous poles, FIG. 4a shows, based on the design variant of FIG. 3, the intermediate positions 1 ', 1 ", 1" "of the window pane 1 and in FIG. 4b a greatly exaggerated detail section.

According to FIG. 4a, the reference point lOOo (corner point formed by the disk edge lOo and the guide edge lOr) lies approximately on a circular arc with the radius R starting from the pole P, regardless of the position of the window pane 1. The radius R should be approximately perpendicular to the leading edge lOr.

From the (exaggeratedly shown) enlargement of FIG. 4b, however, it can be seen that in the intermediate positions of the window panes l ', l'',l''' the orthogonals in the associated reference points 100 ', 100'',100''' on the Guide edges 10r ', lOr'',lOr''' with the same length none common pole, but form migratory instantaneous poles P ', P'',P'''. Even when the orthogonal is extended, they intersect at different points.

The complex, helical sequence of movements of the window pane 1 of a barrel-shaped envelope surface 2o, 2u which swivels during the displacement movement and, if appropriate, is simultaneously displaced in the X direction cannot be described in simple mathematical contexts. However, iterative construction methods lead to very satisfactory technical solutions. Boundary conditions that are appropriate for the individual case (e.g. angle of the trigger line with the Z axis) can be adequately taken into account.

The schematic representation of FIG. 5 shows a fictitious barrel-shaped envelope surface 2 with two window panes 11 and 12 belonging to a motor vehicle, which are in their upper end position essentially above the axis of rotation 20. The window pane 11 is cut in its right edge region by the mirror-symmetrical axis 30. Your right leading edge is inclined to the Z axis. When the window pane 11 is lowered in accordance with the described invention, there is a forward movement in the direction of smaller barrel diameters and a pivoting movement counterclockwise. The other window pane 12, which is located in the right half of the barrel-shaped envelope surface 2, will, however, perform a pivoting movement in a clockwise direction when lowering. Of course, actuation according to the invention of two window panes of one and the same vehicle is also possible, the geometric data of the barrel-shaped envelope surfaces of the individual window panes being able to differ.

Reference list

1 window pane lo window pane in the highest position lu window pane in the lowest position 1 'window pane in the upper intermediate position

1 '' window pane in middle intermediate position 1 '' window pane in lower intermediate position

101 pane edge, left lOr pane edge, right

10r 'right pane edge upper intermediate position

10r 'right pane edge middle intermediate position

10r 'right pane edge, lower intermediate position lOo pane edge, above lOu pane edge, below

100 reference point lOOo reference point above lOOu reference point below 100 'reference point upper intermediate position 100' 'reference point middle intermediate position 100' 'reference point lower intermediate position

2 Contour of the barrel-shaped envelope surface

2o contour of the barrel-shaped envelope surface in the top

position

2u contour of the barrel-shaped envelope surface in the lowest

position

2g contour of the large circular face of the barrel-shaped envelope

2go contour of the large circular end face of the barrel-shaped envelope surface in the upper position 2gu contour of the large circular end face of the barrel-shaped envelope surface in the lower position

2k contour of the small circular end face of the barrel-shaped envelope surface

2ko contour of the small circular end face of the barrel-shaped envelope surface in the upper position 2ku contour of the small circular end face of the barrel-shaped envelope surface in the lower position

20 X axis and rotationally symmetrical axis of the barrel-shaped envelope surface 20o - X-axis of the barrel-shaped envelope surface in the top position

20u - X-axis of the barrel-shaped envelope surface in the lowest position

P - Pol

P '- instantaneous pole in the upper intermediate position

P '' - instantaneous pole in middle intermediate position

P '' '- instantaneous pole in the lower intermediate position

S - intersection

R - radius

H stroke

Hr - stroke of the right edge of the pane

Hl - stroke of the left edge of the pane

11 - window pane (driver's seat)

12 - window pane (rear)

30 - Z-axis mirror-symmetrical axis of the barrel-shaped envelope surface 30o - mirror-symmetrical axis 30u - mirror-symmetrical axis

Claims

claims

1. pane guide for a spherically curved window pane, which can be lowered into a door shaft of a vehicle door and is essentially part of a fictitious barrel surface in the longitudinal direction (X direction) of the vehicle, and which is provided by a double-strand cable window lifter mounted in the door shaft Can be inserted in the direction of the vehicle longitudinal axis (Z direction), the guide rails of which have a first curvature which is adapted to the curvature of the window in the transverse direction of the vehicle (Y direction) and carry cable deflections at the ends over which a closed cable loop is guided, the cable loop also being open the guide rails for the window pane are firmly connected and connected to a drive unit,

characterized,

that both guide rails additionally have a second curvature transversely to the first curvature, such that the sliding movement of the window pane (1, lo, lu, 1 ', 1'',1''') additionally results in a pivoting movement which keeps the lower pane edge parallel by one from a leading edge (IOr, 10r ', 10r'',10r''') of the window pane (1, lo, lu, 1 ', 1'',1''') pivot point spaced in the X direction ( P, P ', P'',P''') is superimposed, the fictitious barrel-shaped envelope surface (2o, 2u), on which the window pane (1, lo, lu, 1 ', 1'',1''') is displaced, simultaneously in the direction of displacement of the window pane (1, lo, lu, 1 ', 1'' , 1 '''), and during the displacement movement between the extreme positions always three points, in particular three corner points of the window pane (1, lo, lu, 1', 1 '', 1 ''') on the barrel-shaped envelope surface (2o, 2u), which is assigned to the window pane (1, lo, lu, 1 ', 1'',1''') in one of the extreme positions.

Window guide according to claim 1, characterized gekennzeich¬ net that the pivot point about which the window pane (1, lo, lu, 1 ', 1' ', 1' '') pivots during the displacement movement, a moving instantaneous pole (P ', P '', P 'is.

Window guide according to claim 1, characterized gekennzeich¬ net that the guide contour (lOr) of the window pane (lo, lu) curved in the pivot plane and the associated guide contour of the guide rail - with a frameless door, possibly the adjacent contour of the vehicle body - for this purpose are curved accordingly, the curvatures projected into the XZ plane depicting the section of a circle on which two reference points of the leading edge of the window pane (lo, lu) are displaced when they are actuated. 4. pane guide according to claim 3, characterized gekennzeich¬ net that the reference points of the leading edge (lOr) the top corner point (lOOo) and the bottom corner point (lOOu) of the window pane (lo, lu) lie on the guide line.

Window guide according to at least one of the preceding claims, characterized in that the contour of the guide rails projected into the XZ plane is curved in such a way that the barrel-shaped window pane (2o, 2u) during the window actuation, in addition to the sliding and pivoting movement, additionally undergoes a pre-displacement in the X direction.

Window guide according to claim 5, characterized gekennzeich¬ net that the guide rails are designed helically, so that the overlapping movements, namely the pivoting movement and the forward displacement of the barrel-shaped window pane (2o, 2u) in the X direction, describe a helix.

* * * * *