DE3144498A1 - Rope drum for the rope drive of a window lifter - Google Patents

Abstract

A rope drum (40) for the rope drive of a window lifter, having a conical winding portion (54), is proposed. This ensures that, as the rope correspondingly winds round the rope drum (40), the rope pull generated by the rope drum (40) is at its greatest when the window is closed or almost closed. The frictional force between the window and gaskets, which is increased in this region, is therefore overcome without further action, even when the drive motor is of low power. <IMAGE>

Description

Cable drum for the cable drive of a window regulator

The invention relates to a cable drum for the cable drive of a Window regulators, in particular for motor vehicles.

Known cable drums of this type have a cylindrical winding area educated. When the manual or motor-driven cable drive is actuated is therefore also that of at constant torque acting on the cable drum the pulling force exerted by the cable drum on the pulling cable is always the same, regardless from the respective position of the window pane. The one used to move the window pane The force required and to be transmitted by the pull rope is, however, along the lifting path of the window regulator is by no means constant. This increases the friction between the Window pane and the window pane guide when closing the window as soon as the upper edge of the window pane is immersed in the upper seal. This increased Of course, friction must also be overcome when the window is opened again. At the Opening a closed window may require additional forces that is, when it comes to the pane frozen in its seals to tear away. With the well-known window regulator with cylindrical rope drum must be the electric motor drive unit or the hand crank drive unit of the cable drive be designed for this worst case scenario. In the case of an electric motor drive unit becomes a relatively large and therefore heavier and more performance-consuming Electric motor required because the rope drum diameter to increase the pulling force is not required can be reduced, because otherwise the closing or opening time of the window regulator getting too long.

In contrast, it is the object of the invention, the cable drum in such a way train that the cable drive at constant drive power from the position exerts different rope tensile forces depending on the window pane.

This object is achieved in that the cable drum at least has two winding areas of different diameters. Since the starting point at which the pull rope touches the cable drum when winding or unwinding the pull rope moves in the direction parallel to the drum axis while the window regulator is being operated, accordingly, the starting point lies alternately in the different winding areas Diameter. Because the tensile force at a given drive torque of the cable drum is inversely proportional to the diameter, the rope tensile force varies accordingly. The pull cable can now be looped around the cable drum in such a way that in the closed position the pulley is the rope contact point in the winding area with the smaller diameter lies. The increased force required to close or open the window pane is therefore available. It is also advantageous that the window pane is in the Their closed position moves relatively slowly when the window regulator is operated, which makes the setting of a ventilation gap much easier. Due to the winding area larger diameter, the closing or opening time of the window regulator is short. The rope designed according to the invention drum increases ease of use the hand crank-operated cable drive; in the case of an electric motor-driven cable drive a light electric motor with low connected loads can be used.

About a sudden change in the rope pulling force while the windows are being operated to exclude and to prevent kinking of the pull rope, it is suggested that that the cable drum has at least one, preferably conical, winding section with a winding radius that varies continuously along the drum axis.

In a first embodiment that is particularly easy to manufacture the cable drum is designed to be conical over its entire winding length.

In the event that in certain adjustment ranges of the window regulator constant rope pulling force and constant window pane speed are required, in particular in the case of window regulators with a large stroke, a further embodiment is used proposed the invention, which is characterized in that at least one end of the winding section with a continuously varying winding diameter a cylindrical winding section is connected.

It is conceivable that the pull rope has tightly spaced turns is wound on the smooth cable drum, so that the mentioned starting point in moves in the desired manner when the cable drum rotates. However, under all Operating conditions ensure that the turns take their intended position and maintained, it is proposed that the winding section or sections with spiral running cable grooves are provided.

To the frictional connection between the pull rope and the rope drum to further increase it can be provided that the cable receiving grooves are corrugated.

In terms of practical operation, it has proven to be particularly advantageous if the cone angle α is 10 to 400, preferably 20 to 30 °, most preferably about 250, amounts to.

The invention also relates to a window regulator with a window pane carrying driver and a rope drive acting on the driver, wherein a connected to the driver by a hand-operated or motor-driven cable drum Pull rope is guided along a loop.

In a first embodiment of the window regulator according to the invention it is provided that the two pull rope ends in the area of the two axial ends the cable drum are attached to this and that starting from the pull rope ends Rope windings are laid side by side on the rope drum.

Since the ends of the pulling rope are fixed to the rope drum, there is a slippage or slipping of the rope on the rope drum is excluded from the start. The desired shift of the starting point or the point of departure of the two from the cable drum outgoing traction rope sections during operation is guaranteed, since one Rotation of the cable drum, one section of the cable wound up in a spiral and the other Rope section is wound spirally.

In the case of a conical winding section, the length also remains the rope loop is essentially constant, since the total length of the rope windings essentially does not change on the cable drum.

In an alternative embodiment of the invention, it is provided that the pull rope ends are not attached to the rope drum but to each other and that on the cable drum provided with spiral cable receiving grooves at least one turn of the rope of the endless pull rope is laid. Here too shifts the start-up or

Point of departure of the two rope sections starting from the rope drum, because with a rotation of the cable drum the at least one turn of the rope migrates in the direction parallel to the drum axis along the conical winding section.

Since this leads to a change in the length of the loop preferably a cable length compensation device is provided. This can for example consist of compression springs that are inserted into a Bowden cable guide for the pull rope are. But it can also be slidably or pivotably mounted rope pulleys are used, which under the action of spring elements for a rope length compensation care for.

The invention is illustrated below with reference to the drawing of several exemplary embodiments explained.

It shows: FIG. 1 a side view of a first embodiment of FIG rope drum according to the invention; Fiq. Figure 2 is a side view of a second embodiment; 3 shows a view of the cable drum according to FIG. 1 in the direction of arrow III coiled pull rope; FIG. 4 shows a view according to FIG. 3, however, in a different manner coiled pull rope; and FIG. 5 is a schematic view of a window regulator.

In Fig. 5 is a rough diagram of a window regulator for installation in motor vehicle doors shown, which is indicated generally at 10. One on a vertical guide rail 12 slidably mounted driver 14 carries a support rail 16, which the lower The transverse edge of a window pane 18 engages. The driver 14 can by means of a rope drove 20 can be moved back and forth in the vertical direction along the guide rail 12.

The cable drive 20 is formed by a pull cable 22, which is shown in a closed loop, starting from an electric motor drive unit 24, Guided over pulleys 26 and 28 at the lower and upper end of the guide rail 12, respectively is. The pull rope sections 30 and 32 between the drive unit 24 and the lower or upper pulley 26, 28 can either be exposed or run in Bowden cable sleeves.

The pull rope section 34 between the pulleys 26 and 28 is on Driver 14 attached, for example, via one attached to the driver 14, rope nipple 36 indicated in FIG. 5.

The drive unit 24 houses in addition to an electric motor and a Transmission (in each case not shown) a schematically indicated cable drum 40.

Fig. 1 shows in an enlarged view the one designed according to the invention Cable drum 40. Purely schematically, a housing 42 of the drive unit is shown in FIG 24 indicated with broken lines. A worm wheel is also indicated 44, which meshes with a worm 46. The screw 46 can, for example, directly be flanged onto the motor shaft of the electric motor of the drive unit 24.

Worm wheel 44 and cable drum 40 are on a common, am Housing attached bearing shaft 48 rotatably mounted.

On the left end face of the cable drum 40 in FIG. 1 there are four driving projections 50 distributed over the circumference, which are in corresponding recesses in the worm wheel 44 intervene and in this way a non-rotatable connection between the two parts 40 and 44.

On an enlarged diameter carrying the driving projections 50 Bund 52 is followed by a conically tapering winding section 54, which up to in Fig. 1 right end face 56 (see also Fig. 3) is enough. The winding section 54 is provided with cable receiving grooves which are part-circular in cross section 58 formed, the winding portion 54 in the manner of a continuous spiral cover completely. Instead of a single spiral, however, several can also be used such spirals, covering the winding section 54, run side by side. Of the The cone angle α entered in FIG. 1 is approximately 250.

The radius r1 at the narrow end of the cone is approximately two thirds of the radius r2 at the wide end of the cone.

In Fig. 3 is shown schematically how the pull rope 22 on the rope drum 40 is to be attached. The cable section coming from the right in FIG. 3 is, for example formed by the upper cable section 32 in FIG. 5. This section is through a Marked dash-dot-dot line. This rope section 32 is set in a Series of turns on the cable drum 40 proceeding from one in the middle area of the winding section 54 lying start or run-off point A in the direction of wider cone end are wound spirally. The following end of the rope leaves the winding portion 54 through a radial groove 60 of the collar 52 and is at the in Fig. 1 is attached to the left end of the cable drum 40, for example by, that a corresponding cable nipple in a nipple receptacle 64 indicated in FIG is used.

The cable section 30 coming from below is connected to it Starting point or run-off point B a few turns of the rope leading to the sciimäleren end of the cone are wound towards the cable drum 40, these turns as well as the already mentioned turns, inserted into the corresponding cable receiving grooves 58 are. At the narrow end of the cone, the one following the rope section 30 is connected Turns the other end of the rope, which in turn is attached to the rope drum 40 is. This, in turn, can do this can be achieved that a rope nipple 66 at the end of the pull cable into a corresponding nipple receptacle 68 in the end face 56 is used.

When the cable drum 40 is rotated, for example clockwise (Direction A) of FIG. 3, the pull rope section 32 is moved to the right in FIG. 3 with increasing unwinding of corresponding rope windings.

This leads to point A (in this case the point of departure) increasingly shifts towards the wider cone end. Enlarged accordingly the radius r associated with the respective run-off point A also finally increases up to this point is equal to the radius r2 according to FIG. 1 when the turns are fully developed. The other section 30 is increasingly on the cable drum with this cable drum rotation 40 wound, which means that point B (in this case: starting point) in the same direction, namely to the wider end of the cone. With a given, torque exerted by the worm 46 via the worm wheel 44 on the cable drum 40, therefore the lever arm length defined by the respective radius of the starting point B increases. The amount exerted on the section 30 of the pull rope 22 is correspondingly reduced Traction. On the other hand, the transport speed increases with this winding movement of the pull rope 22, assuming a constant speed of rotation of the rope drum 40.

From the above it follows that when the cable drum in to Direction A is rotated in the opposite direction, which is directed to section 32 of the The pulling force exerted by the pull rope increases continuously, reducing the transport speed of the rope.

In the one indicated in Fig. 5 with a broken outline, with 18 ' designated closed position of the window pane 18 are the starting and draining points A and B in-their position closest to the narrow end of the cone. Corresponding The tensile force is greatest at radius r1 and is at the specified radius ratio about 1.5 times the tensile force with the window fully open (points A and B at the wide end of the cone). Due to the high pulling force when closed or almost With the window closed, there is no problem even with a poorly dimensioned one Electric motor to move the window pane 18, although the additional frictional force is to be overcome between the disc and the upper seal. Even a tear away The window regulator 10 can cope with the iced-up window from the seals Transport speed of the pull rope in the upper setting 18 'of the window 18 is relatively small, the window pane 18 can be precisely positioned, in particular for setting a ventilation gap.

In Fig. 4 is a different from Fig. 3 type of occupancy Cable drum 40 with the pulling cable 22 is shown.

The pull rope 22 is now designed as a completely closed loop, that is, with rope ends attached to one another, for example by means of the rope nipple 36 on the driver 14 (see Fig. 5). To ensure the frictional connection between the pull cord 22 and to produce cable drum 40 is at least one cable turn on the cable drum 40 wound (i.e. inserted into the corresponding groove 58). In the event of a twist the cable drum 40 moves this one turn of the rope in the direction parallel to Cable drum axis 70.

However, while in the type of winding shown in FIG. 3, the total length of the each wound turns constant and thus also the length of the over the pulleys 26 and 28 guided rope loop, changes in the type of winding according to FIG. 4, the length of the respectively wound one cable turn and thus also the loop length. It must therefore be provided for a rope length compensation, for example in that the deflection roller 28 is displaceable in the direction of arrow C against spring force is trained. To increase the frictional connection between the one turn and the grooves 58, the grooves 58 can be corrugated.

In Fig. 2 a further embodiment of the cable drum is shown, where components that correspond to those of the cable drum 40 are given the same reference numerals, in each case increased by the number 100. The cable drum 140 according to FIG. 2 is in turn formed at its left end with a collar 152, of which in the axial Towards the left, driving projections 150 protrude. A bearing hole for the bolt 48 according to FIG. 1 passes through the cable drum 140 and is denoted by 151. In the difference apart from the conical winding section, the cable drum 140 faces the cable drum 40 154 also has two cylindrical winding sections 170 and 172, which are shown in Fig. 2 to the left or to the right on the conical winding section 154 directly connect. The section 170 therefore has the circumferential radius r2 and the section 172 the circumferential radius r 1 By this configuration one achieves that on a Adjustment range of the window regulator with varying rope pulling force and varying Cable speed in both directions connecting adjustment ranges with constant Pulling force and constant speed. This configuration proves to be special advantageous for window regulators with a long adjustment range. Section 172 what is indicated by a broken cutting line 174 is also omitted.

The window lifter 10 described above is characterized from the fact that he with high functional reliability with a weakly dimensioned and therefore correspondingly light electric motor gets by. In the case of one not shown Hand crank drive results in a high level of operating comfort for the window regulator, because the forces to be expended even when the window is closed or almost closed stay small and still open windows quickly or

Closing is achieved.

Claims (10)

Cable drum for the cable drive of a window regulator 1. Cable drum (40; 140) for the cable drive (20) of a window regulator (10), in particular for motor vehicles, characterized in that they have at least two winding areas having different diameters. 2. Cable drum according to claim 1, characterized in that it is at least a, preferably conical, winding section (54; 154) along the drum axis (70) has a continuously varying winding radius. 3. Cable drum according to claim 2, characterized in that it uses its entire winding length is conical (Fig. 1). 4. Cable drum according to claim 2, characterized in that on at least one end of the winding section (154) with a continuously varying winding diameter a cylindrical winding section (170, 172) is connected (Fig. 2). 5. Cable drum according to one of the preceding claims, characterized in that that the winding section or sections (54; 154, 170, 172) with a spiral Cable grooves (58) are provided. 6. Cable drum according to claim 5, characterized in that the cable receiving grooves (58) are corrugated. 7. Cable drum according to one of claims 2 to 6, characterized in that the cone angle α is 10 to 400, preferably 20 to 300, most preferably about 250. 8. Window lifter (10) with a window pane (18) carrying Driver (14) and a cable drive (20) engaging the driver, with a of a hand-driven or motor-driven cable drum (40; 140) according to one of the preceding Claims driven, with the driver (14) connected pull rope (22) along a Loop is guided, characterized in that the two pull rope ends in the area of the two axial ends of the cable drum (40) are attached to this and that of Starting from the pulling rope ends, rope windings next to each other onto the rope drum (40) are laid. 9. Window lifter according to claim 8, characterized in that the pull rope ends are not attached to the cable drum (40) but to each other and that on the cable drum (40) provided with spiral cable receiving grooves (58) at least a rope turn of the endless pull rope (22) is laid. 10. Window lifter according to claim 8 or 9, characterized by a Rope length compensation device.