JPH0341632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wind lifter with a rope winding barrel for a rope drive, in particular to a wind lifter for motor vehicles.

[Prior Art] The rope winding barrel of a known wind lifter of this type has a cylindrical winding area, which allows the rope winding to occur when a manual or electric motor driven rope drive is actuated. If the torque acting on the cylinder is constant, the pulling force exerted on the pulling rope by the rope winding cylinder is also always of the same magnitude, regardless of the respective position of the window pane. However, the force required to move the windshield, transmitted by the pulling rope, is by no means constant over the travel distance of the windshield lifter. For example, if the upper edge of the windshield slides into the upper sealing element when closing the window, the friction between the window glass and the guide element of the windshield increases. This increased friction must of course also be overcome when attempting to reopen the window. When opening a closed window, additional force is required, for example to pull away frozen glass from the sealing element.
In known wind lifters with a cylindrical rope winding drum, the electric motor drive unit or the hand crank drive unit of the rope drive has to be designed taking into account the extremely disadvantageous case mentioned above. In the case of drive units with electric motors, the diameter of this rope winding cylinder cannot be reduced in order to increase the pulling force, so that relatively large, heavy and power-consuming electric motors are required. Otherwise, the time required to close or open the window lifter would be very long.

[Problem of the Invention] It is an object of the invention to configure the rope winding drum in such a way that, with a constant drive power, the rope drive can exert different rope tension forces in relation to the position of the windshield. It's about doing.

[Means for Solving the Problems] According to the present invention, the above problem is solved by providing a driving body for supporting the window glass and a rope drive device engaged with the driving body, and by manually or by power. A tension rope driven by the driven rope winding cylinder and connected to the driver is guided in a loop starting from the rope winding cylinder and returned to the rope winding cylinder via the driving body. A type of rope winding body in which at least one turn of a tension rope is wound around a rope winding body having a spirally extending rope receiving groove, in which the rope winding body changes along its axis. The solution is to have a winding section with a winding radius of The winding point where the tension rope contacts the rope winding barrel moves in a direction extending parallel to the axis of the rope winding trunk as the tension rope is wound or unwound during operation of the wind lifter. The winding points are located accordingly in alternating winding ranges of different diameters. Assuming that the driving torque of the rope winding drum is constant, the tensile force is inversely proportional to the diameter of the drum, so the rope tensile force also changes accordingly. The tension rope is wrapped around the rope winding barrel in such a way that the winding point of the rope is located in the smaller diameter winding area when the windshield is in the closed position. This increases the force required to close or open the window pane.

[Operations and effects of the present invention] In the present invention, when the window lifter is operated, the window glass moves relatively slowly in the closed position range, so that the ventilation gap can be adjusted extremely easily. It became. By using the larger diameter wrapping area,
The time required to close or open this window lifter can be shortened. A rope winding barrel constructed in accordance with the invention makes it possible to increase the operating comfort of hand-cranked rope drives and, in the case of rope drives with electric motors, to provide low-power light electric motors. It became possible to use a motor.

According to the invention, the rope winding body has at least one section in which the winding radius gradually changes along the axis of the rope winding body, so that sudden changes in the rope tension during operation of the wind lifter can be avoided. , the tension rope is prevented from breaking. In one embodiment of the invention, this winding section is conically shaped.

In one embodiment of the invention, which is particularly simple to manufacture, the rope wrapper is of conical design over its entire winding length.

If a constant rope tension and a constant windshield transport speed are desired in a given adjustment range of the window lifter, in particular when the wind lifter has a large stroke, according to a further embodiment of the invention, the At least one end of the winding section of varying winding diameter is followed by a cylindrical winding section.

In this case, a tension rope with windings closely wrapped around each other is wound around a smooth looped body, so that the above-mentioned winding points remain in a predetermined manner as the rope body rotates. be moved. However, in order to ensure that the winding occupies and maintains its predetermined position during the entire operation, a helically extending rope receiving groove is provided in the winding section.

In order to further increase the frictional connection between the pulling rope and the rope winding barrel, this rope receiving groove can also be provided with a narrow groove.

For practical drives, the cone angle α is between 10° and 40°, in particular between 20° and 30°, most advantageously about 25°.

The window lifter has a driving body which holds the window glass and a rope drive engaged with this driving body, in which case the windshield is carried by a rope winding cylinder driven manually or by an electric motor. A tension rope connected to the body is guided in a loop. In one embodiment of the invention, both ends of the tension rope are fastened to the rope winding body in the axial end region of the rope winding body, and the rope windings starting from this tension rope end are arranged next to each other and the rope It is wrapped around the drum. Since the tension rope end is fixed to the rope winding barrel, slipping of the rope on the rope winding barrel is excluded from the beginning. The fact that the winding or unwinding points of both tension rope segments on the rope winding barrel move in the desired manner during operation is such that one tension rope segment is wound in a helical manner as the rope winding barrel rotates. This is ensured by unwinding the other tension rope section in a helical manner. In this case, the overall length of the rope coil wound around the rope trunk in the conical winding section does not change substantially, so that the length of the rope loop also remains substantially constant.

In a further embodiment of the invention, the ends of the tension ropes are fixed to one another rather than to the rope shell, and the rope shell has a helically extending rope-receiving groove at least one of the endless tension ropes. Two windings are arranged. In this embodiment as well, when the rope winding cylinder rotates, at least one winding moves along the conical winding section in a direction extending parallel to the rope winding cylinder, so that the winding section emanating from the rope winding cylinder is The winding or unwinding points of both tension rope sections are also moved. In this case, since the length of the rope loop changes, it is effective to provide a balancer mechanism. This balancer mechanism can consist, for example, of a pressure spring inserted into a Bowden cable guide for the tension rope. A rope deflection roller mounted movably or pivotably under the action of a spring element may also be used to balance the length of the rope.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings. FIG. 5 schematically shows a window lifter 10 that is attached to an automobile door. The driver 14, which is movably mounted on the vertical guide strip 12, carries a holding strip 16 which grips the lower lateral edge of the window glass 18. The driver 14 can be moved vertically back and forth along the guide strip 12 by means of a rope drive 20 .

The rope drive 20 comprises a pulling rope which originates from a drive unit 24 with an electric motor and is guided in a closed loop via deflection rollers 26 and 28 at the lower or upper end of the guide strip 12. It consists of 22. Drive unit 2
4 and the lower deflection roller 26 and the tension rope section 32 between the drive unit 24 and the upper deflection roller 28 may be laid bare but also with Bowden cable sleeves. You may be told that it is inside. Tension rope section 3 between deflection rollers 26 and 28
4 is fixed to the driver 14 via a rope nipple 36 attached to the driver 14, for example as shown in FIG.

The drive unit 24 includes, in addition to an electric motor and a transmission (both not shown), a rope winding drum 40, which is shown schematically.

FIG. 1 shows an enlarged view of a rope winding barrel 40 constructed in accordance with the present invention. FIG. 1 also shows the housing 42 of the drive unit 24 schematically in broken lines. Similarly, the worm gear 44 meshing with the worm 46 is also shown in broken lines. This worm 46 is, for example, the drive unit 24.
may be coupled directly to the motor shaft of an electric motor. The worm gear 44 and the rope winding barrel 40 are rotatably supported on a common support shaft 48 fixed to the casing 42. There are four driver protrusions 50 on the left end surface of the rope winding body 40 as seen in FIG.
are distributed circumferentially. These entrainment projections 50 engage in corresponding notches of the worm gear 44 and connect the rope winding barrel 40 and the worm gear 44 in a relatively fixed manner.

Large diameter collar 5 holding entrainment projection 50
2 has a right end surface 56 that tapers into a conical shape.
(See also Figure 3) Wrapping section 5
4 continues. A rope receiving groove 58 having a partially circular cross section is formed in the winding section 54, and the rope receiving groove 58 is formed as a single helical groove extending over the entire winding section 54. However, instead of a single helical groove, a plurality of helical grooves extending over the entire winding section 54 may be provided next to one another. The cone angle α shown in FIG. 1 is approximately 25°, and the radius r ₁ of the narrower conical end is approximately 2/3 of the radius r ₂ of the wider conical end.

The tension rope 22 is secured to a rope spool 40 as shown schematically in FIG. The rope section coming from the right side in FIG. 3 is, for example, the upper tension rope section 32, which is indicated in dash-dotted lines in FIG. This tension rope section 32 follows a series of turns on a rope winding barrel 40.
This winding is wound in a helical manner from a winding or unwinding point A located in the central region of the winding section 54 towards the wide conical end. The rope end is then inserted into the radial groove 6 of the collar 52.
0 and exits this winding section 54 through the end face of the rope to the left in FIG. 1, for example by inserting the rope nipple into the nipple receptacle 64 shown in FIG. Fixed.

The tensioning rope section 30 coming from below is followed at the winding or unwinding point B by a number of turns which are wound around the rope winding barrel 40 towards the narrow conical end. In this case, these windings are arranged in corresponding rope-receiving grooves 58 in the same way as the windings described above. At the narrow conical end, the other rope end follows the winding which follows the tension rope section 30. This rope end is similarly fixed to the rope winding trunk 40. This fixation is also effected by inserting the rope nipple 66 at the rope end into a nipple receptacle 68 on the end face 56 of the rope barrel 40.

When the rope winding barrel 40 is rotated, for example in the clockwise direction (arrow D) as shown in FIG. be moved in a direction. As a result, point A (in this case the payout point) moves towards the increasingly wider conical end. Correspondingly, the radius r corresponding to the respective unwinding point A also increases until it finally becomes equal to the radius r ₂ shown in FIG. 1 when the winding is completely unwound. The other tension rope section 30 is progressively wrapped around the rope barrel 40 as the rope barrel is rotated as described above. As a result, point B (in this case the winding point) also moves in the same direction, ie towards the wider conical end. Therefore, when a predetermined torque is generated on the rope winding drum 40 by the worm 46 via the worm gear 44, the winding point B
The length of the lever arm, defined by the respective radius of , increases. The tensile force exerted on the tension rope section 30 of the tension rope 22 decreases accordingly. On the other hand, assuming a constant rotational speed of the rope winding drum 40, the conveying speed of the tension rope 22 is increased during this winding movement.

As is clear from the above, when the rope winding barrel 40 is rotated in the direction opposite to arrow D, the tension rope section 32 of the tension rope 22
The tensile force exerted on the rope increases continuously while decreasing the transport speed of the rope.

In the closed position 18' of the window glass 18, outlined in broken lines in FIG. 5, the winding or unwinding points A and B are located closest to the narrow cone. In this case, the tensile force is greatest, corresponding to the radius r ₁ , and for the radius ratio mentioned above, when the window is fully opened (points A and B
is approximately 1.5 times the tensile force at the wide conical end). Due to the high tensile forces in the closed or nearly closed state of the window, the additional frictional forces between the window glass and the upper sealing member need to be overcome, which is difficult with weak electric motors. The window glass 18 can be moved without any movement. This Wind Lifter 1 can even remove frozen window glass from the sealing member.
It is done with 0. The conveying speed of the pulling rope 22 is relatively low in the region of the closed position 18' above the window glass 18, so that this window plate 18 can be precisely positioned in particular for adjusting the ventilation gap.

In FIG. 4, the tension rope 22 is wound around a rope winding drum 40 in a different manner from that in FIG. This tension rope 22 is, for example, a driver 14
The rope ends are secured to each other by rope nipples 36 provided at the ends of the rope so as to form a completely closed loop (FIG. 5). tension rope 2
2 and the rope winding barrel 40, at least one rope turn is wound around the rope winding barrel 40 (i.e. arranged in the corresponding rope receiving groove 58). ).
When the rope barrel 40 is rotated, the rope turns move in a direction extending parallel to the axis 70 of the rope barrel.

In the winding format shown in FIG. 3, when the rope winding drum 40 rotates, each point A, B moves on the rope winding drum 40 in the same direction at approximately the same speed. Therefore, assuming that the radii of points A and B are approximately equal and that the triangular rope loop guided through the deflection rollers 26 and 28 is sufficiently large compared to the radii of points A and B, the winding in each case The overall length of the attached multiple windings and thus the length of the rope loop remains approximately constant. however,
In the winding type shown in FIG. 4, the length of each wrapped rope, and thus the length of the rope loop, varies considerably.
Therefore, in order to balance the length of the rope, it is necessary, for example, to configure the deflection roller 28 so that it can move in the direction of arrow C against the spring force. In order to increase the frictional connection between the rope winding and the rope receiving groove 58, this rope receiving groove 58 is knurled.

A second embodiment of the rope winding barrel is shown in FIG. 2 and is designated by the reference numeral 140. In this embodiment as well, a collar 152 is formed at the left end of the rope winding trunk 140, and an entraining projection 150 projects from the collar 152 to the left when viewed in the axial direction. A bearing hole 151 for the bearing shaft 48 according to the embodiment of FIG. 1 passes through the rope winding barrel 140. The rope winding barrel 140 according to the exemplary embodiment of FIG.
70 and 172. These winding sections 170, 172 follow directly on the left or right side of the conical winding section 154 as viewed in FIG. Wrap section 170 thus has an outer radius r ₂ and wrap section 172 has an outer radius r ₁ . By configuring the rope winding barrel in this way, an adjustment range of the wind lifter with varying rope tension and rope transport speed can be continued in both directions with an adjustment range with constant tension and rope transport speed. I started to be able to do it. This embodiment has been shown to be particularly suitable for wind lifters with long adjustment distances. Winding section 172, optionally with dash-dotted cutting line indicated at 174
may be omitted.

The above-described wind lifter 10 is distinguished by the fact that a sufficiently high functional reliability can be achieved with a weak and light electric motor. In addition, in the case of a manual crank drive device (not shown), the window can be opened or closed quickly even when the window is closed or almost closed, although the power consumed is small. This allows the wind lifter to be operated comfortably.

[Brief explanation of the drawing]

FIG. 1 is a side view of a first embodiment of the rope winding body of a wind lifter according to the present invention, and FIG.
3 is a side view of the embodiment; FIG. 3 is a view of the rope winding barrel shown in FIG. 1, with the tension rope wound thereon, seen from the direction of the arrow; FIG. 4 is a view of the rope winding body shown in FIG. 3; FIG. 5 is a schematic diagram of the wind lifter, in which a tension rope is wound around the trunk in a different manner from FIG. 3; 10... Wind lifter, 12... Guide strip, 14
... Entraining body, 16... Holding condition, 18... Windshield, 18'... Closed position, 20... Rope drive device,
22...Tension rope, 24...Drive unit, 26
... direction change roller, 28 ... direction change roller, 30 ... tension rope section, 32 ... tension rope section, 34 ... tension rope section, 36 ... rope nipple, 40 ...
Rope winding trunk, 42...Casing, 44...Worm gear, 46...Worm, 48...Support shaft, 50...
Entraining protrusion, 52... collar, 54... winding section, 5
6... End face, 58... Rope receiving groove, 60... Radial groove, 64... Nipple receiving portion, 66... Rope nipple, 68... Nipple receiving portion, 70... Axis of rope winding drum, 140... Rope winding drum, 150... Entraining protrusion, 151...Support hole, 152...Brim, 15
4... Winding division, 170... Winding division, 172...
Winding section, 174...cutting line.

Claims (1)

[Claims] 1. A driving body for supporting the window glass and a rope drive device engaged with the driving body are provided, and are driven by a rope winding drum driven manually or by power. A tension rope connected to the driver is guided in a loop starting from the rope winding cylinder via the driver and returned to the rope winding cylinder in a loop extending through a helically extending rope receiving groove. of the type in which at least one turn of the tension rope is wound on a rope winding trunk provided with a winding section 54 with a winding radius that varies along its axis; ,1
54. A window lifter comprising: 54. 2. The wind lifter according to claim 1, wherein the rope winding trunk 40 has a conical shape over its entire winding length. 3. Wind lifter according to claim 2, characterized in that at least one end of the winding section 154 having a gradually varying winding diameter is followed by a cylindrical winding section 170, 172. 4. The wind lifter according to claim 3, wherein the rope receiving groove 58 is knurled. 5. The wind lifter according to any one of claims 2 to 4, wherein the conical angle α of the rope winding barrel is from 10° to 40°. 6. Both ends of the tension rope are fixed to the rope winding body 40 in both end regions in the axial direction of the rope winding body 40, and the rope windings starting from the ends of the tension rope are arranged next to each other to form the rope winding body 40. The window lifter according to claim 1, wherein the window lifter is arranged in a. 7. The wind lifter according to any one of claims 1 to 6, which is provided with a balancer mechanism that balances changes in rope length.