DE102019107716A1 - SLIDING DOOR OPERATOR FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a sliding door drive (1) for a motor vehicle with a drive unit comprising a housing (2, 3, 4, 5), an electric drive, a gear (9) connected downstream of the drive and a clutch (21), whereby the Drive unit at least one winding drum (15, 16) arranged on a shaft (11) can be driven, the shaft (11) at least twice in the housing (2, 3, 4, 5), in particular at the axial ends of the shaft (11), is stored in the housing (2, 3, 4, 5).

Description

The invention relates to a sliding door drive for a motor vehicle with a drive unit comprising a housing, an electric drive, a gear connected downstream of the drive and a coupling, at least one winding drum arranged on a shaft being drivable by means of the drive unit.

In today's motor vehicles, electrically operated sliding doors are used more and more. This facilitates access to the motor vehicle and / or gives children, for example, the opportunity to operate large sliding doors for getting in and out. The sliding doors are used in vans as well as in passenger cars. The sliding doors differ in terms of their size and weight. In the case of large sliding doors, the sealing pressures to be overcome also play a decisive role in the electrical operation of the sliding doors. This means that different requirements can be placed on a sliding door drive. In many cases, cables are used to actuate, that is, to move or move the doors.

So is from the DE 10 2014 109 055 A1 a sliding door drive has become known, in which cable drums are driven by means of an electric motor and a gearbox and a clutch. The rope or winding drums are driven by a reversing drive motor via an interposed gear. When the sliding door is closed, a rope strand connected to a door arm is wound onto a winding drum and another rope strand connected to the support arm is unwound from a further winding drum. The cable or winding drums are mounted on one side via a mounting in the clutch gear unit.

In the DE 198 19 421 A1 a sliding door drive for the sliding door of a motor vehicle is disclosed, the sliding door being connected to a cable unit with a door arm and the cable unit having at least one cable and at least one winding drum for winding and unwinding cables. The winding drum is driven by a reversing drive motor via an interposed gear, with a cable strand connected to a door arm being wound on the winding drum and another cable strand connected to the support arm being unwound from the winding drum when the sliding door is closed. In addition, the drive motor and the transmission are arranged on the inside of the body, a cable guide being provided for the cable pull. When the sliding door is closed, a rope strand connected to the door arm is wound onto the winding drum and another rope strand connected to the support arm is unwound from the winding drum. The winding drum is designed as a one-piece drum. But there is also the possibility of realizing two coaxially mounted winding drums which are loaded in opposite winding directions by means of a spring to maintain the rope tension.

From the U.S. 4,640,050 B, a sliding door drive for a sliding door has become known, in which the sliding door can be moved from a closed position to an open position or vice versa. The sliding door drive has a reversing motor fastened to the underside of the vehicle floor panel, a speed reducing device and an electromagnetic claw clutch fitted in this speed reducing device. A cable drum extending down below a housing is rotatably mounted on the lower part of the shaft. A rotor is connected to the top of the cable drum via a wedge connection in such a way that it can be moved axially to the shaft, but not rotated relative to the cable drum. The cable drum is rotatably mounted on a drive shaft, the drive shaft being received in a housing and a housing cover. A drive shaft bearing on both sides is disclosed, but the drive shaft itself in turn forms a bearing point for a ball bearing of the cable drum, so that a structurally complex solution is disclosed.

The known state of the art shows possible solutions for mounting a cable drum of a sliding door drive, but is in need of improvement overall. In particular, depending on the size of the driven sliding door, the forces on the cable drum can vary greatly and / or environmental influences can influence the load on the cable drum. In any case, the cable drum must be able to provide a moment that is as uniform as possible for actuating the sliding door and, in extreme situations, it should be possible to provide a bearing for the shaft of the cable drums with as little play as possible and thus as safe as possible. This is where the invention comes in.

The object of the invention is to provide an improved sliding drive for a motor vehicle. In particular, it is the object of the invention to provide a sliding door drive for a motor vehicle which ensures backlash-free mounting of the cable drums, which is structurally simple and by means of which high long-term stability of the sliding door drive can be provided.

The object is achieved by the features of independent claim 1. Advantageous embodiments of the invention are specified in the subclaims. It will care It should be noted that the exemplary embodiments described below are not restrictive; rather, any possible variations of the features described in the description and the subclaims are possible.

According to claim 1, the object of the invention is achieved in that a sliding door drive for a motor vehicle with a drive unit is provided, comprising a housing, an electric drive, a gear connected downstream of the drive and a clutch, with at least one on a shaft by means of the drive unit arranged angle drum can be driven, the shaft being mounted at least twice in the housing, in particular at the axial ends of the shaft in the housing. The design of the sliding door drive according to the invention now creates the possibility of providing a play-free mounting for the cable drums. In particular, the double bearing of the shaft in the housing enables the cable drums to be guided precisely and thus to ensure a continuous drive by means of the cable drums, even in extreme situations. For example, environmental influences, such as frost, can result in the sliding door being difficult to move, so that increased loads act on the sliding drive. The load is transferred to the cable drum or winding drum by means of the cable arranged on the sliding door. As a result of the double storage, the cable drum can be securely positioned so that a uniform introduction of a force into the sliding door can be ensured and at the same time the risk of the cable jumping over in the winding groove of the cable drum can be prevented. In terms of design, a permanently stable and resilient drive system can be made available, since no or only very low tilting forces are introduced into the drive mechanism and in particular into the drive components downstream of the shaft due to the double bearing arrangement of the shaft. The loads from the cable on the drive are evenly absorbed in the housing, so that the lowest possible loads are introduced into the gear components downstream of the shaft.

The shaft is preferably received in the housing at its axial ends. Axial ends mean at least the areas of the shaft that are outside the receptacle or bearing surfaces of the winding shaft or the winding shafts. The bearing points for the winding shaft are thus spaced apart on the shaft and on the opposite ends of the cable drum on the shaft. The bearing points are preferably at the axial ends or at least on one side at an axial end of the shaft and, as far as structurally possible, at the axial end.

The sliding door drive has a drive unit and preferably an electric motor with which a corresponding output torque can be introduced into the sliding door drive. The electric drive works together with a gear to provide the corresponding gear ratios for the sliding door. The transmission ratios can of course fluctuate, since different door widths, door weights or door heights can be driven by means of the sliding door drive. The gearbox adapts the drive torque and / or the speed of the electric drive to the closing speed.

For further adaptation to the closing speed, the diameter of the cable drum can be varied, so that in turn the forces available when moving the sliding door can be influenced.

The sliding door drive further comprises a coupling so that the drive can be decoupled from the shaft of the winding drum. This decoupling of the drive is necessary to enable emergency operation of the sliding door. In general, the electric drive has a braking torque that can prevent or at least severely restrict a shifting of the sliding door, in particular in combination with the transmission. So that the sliding door can be moved manually and easily manually in the event of a power failure, for example, the drive chain can be interrupted by means of the coupling and enable the sliding door to be moved manually. Embodiments of the coupling are known, for example, from the cited prior art.

An embodiment variant of the invention results when the housing is constructed in several parts, in particular in two or three parts. A multi-part structuring of the housing enables easy assembly of the sliding door drive and at the same time there is the possibility of providing bearing points at preferred points on the shaft or winding shaft, which enable the shaft to be supported in a defined manner and at preferred bearing points. The housing is preferably designed in three parts. A gearwheel with which the drive motor meshes is rotatably mounted in a lower part of the transmission. In addition, the lower part of the transmission carries the transmission and the clutch. By means of the gear center part, the gear is mounted on the one hand and at the same time the center part offers a first bearing point for the shaft of the cable drums. The housing can be closed by means of a gear cover, with the housing cover simultaneously being able to provide a further bearing point for the winding shaft.

If at least one bearing point of the shaft is arranged in a housing cover, a preferred embodiment of the invention is achieved. The gear cover receives an outer axial end of the shaft and includes a bearing point for the shaft. The cable drums or winding drums are received directly on the shaft in a form-fitting and / or force-fitting manner. If the shaft is rotatably supported in the middle gear part, an axially spaced further bearing can be provided for the shaft by means of the housing cover. The bearing point in the housing cover is arranged at one axial end of the shaft, so that the most favorable bearing point possible can be made available for absorbing moments from the pull cords of the door drive. The shaft is supported by the bearing point in the housing cover at the outer axial end, which ensures that the shaft is supported safely and stably even in extreme situations in which large tensile forces occur in the cables of the sliding door drive.

If two winding drums are arranged on the shaft or winding shaft, a further embodiment variant of the invention results. In this preferred embodiment, a winding shaft is connected to a support arm of a sliding door, so that by means of this first winding drum it is possible, for example, to pull the sliding door shut. The second winding drum has a rope that is connected on the one hand to the winding drum and on the other hand also to the support arm of the sliding door, the rope being guided in the body of the motor vehicle in such a way that the sliding door can be pushed open or opened by means of this second rope. The ropes of the first and second winding drums thus act in different directions with respect to the sliding door. If, for example, the sliding door is pulled shut by means of the first rope, the rope being wound up on the first winding drum, the second rope is unwound on the second winding drum. In order to be able to achieve secure holding of the first and second winding drums on the shaft, the winding drums can be fastened to the shaft by means of a spring element and in particular by means of a single spring element. For example, the winding drums can be mounted on the shaft by means of a tongue and groove connection.

In a further embodiment variant, the shaft is directly connected to the transmission, in particular to a planetary gear carrier of an epicyclic gear, the planetary gear carrier having a receiving means for the shaft. The shaft or winding shaft carries the cable drums and is mounted in the housing. In the direction of the drive, the shaft can have an axial extension beyond the bearing point and thus come into engagement with the planetary gear carrier of the epicyclic gear. The shaft is preferably inserted positively into an opening in the planetary gear carrier. The planet gear carrier itself can preferably be mounted in the housing in the area of the receiving means for the shaft.

In a further preferred embodiment, the receptacle has a reinforcing element, in particular a metallic sleeve, so that a reliable transmission of the torque from the gear into the winding shaft is possible. The reinforcement element ensures a high level of long-term stability of the sliding door drive. In particular, components of the sliding door drive, such as the winding shaft itself and the planetary gear carrier, can be made of plastic. Depending on the requirements placed on the sliding door drive, the components in the power flow of the sliding door drive can of course also be made of metallic materials such as brass, aluminum or steel.

However, it can also be advantageous and form a further embodiment of the invention if the shaft is made of plastic, the shaft being provided with at least one metallic core. A plastic shaft offers the advantage of low weight and easy formability, so that a structurally favorable structure and easy assembly is possible. The additional metallic reinforcement of the plastic shaft allows the advantages of low weight to be combined with sufficient stability for the transmission of the required torques. In particular, the metallic core can extend through the shaft in regions and preferably into a region of the gearbox that receives the shaft.

Another embodiment variant of the invention results when the shaft is mounted in plain bearings in the housing. Plain bearings offer a structurally favorable option for achieving high long-term stability and at the same time are extremely small, and are also advantageously extremely small and inexpensive. The shaft is preferably supported at one axial end in the housing cover by means of a sliding bearing and is rotatably held in the housing center part in a sliding bearing. In addition, a sliding bearing for guiding the planetary gear carrier can be arranged in the area of the receiving means for the shaft. The inventive construction of the sliding door drive ensures that the cable drums are supported without play even under the highest loads, while at the same time a structurally favorable construction and high long-term stability can be guaranteed.

The invention is described below with reference to the attached drawing a preferred embodiment explained in more detail. However, the principle applies that the exemplary embodiment does not limit the invention, but merely represents an exemplary embodiment of the invention. The features shown can be implemented individually or in combination with further features of the description as well as the claims individually or in combination.

• 1 einen Schnitt durch einen erfindungsgemäß aufgebauten Schiebetürantrieb, wobei der Schnitt als Querschnitt durch eine Längsachse der Welle der Wickeltrommeln wiedergegeben ist.

It shows:

• 1 a section through a sliding door drive constructed according to the invention, the section being shown as a cross section through a longitudinal axis of the shaft of the winding drums.

In the 1 is a sliding door drive 1 reproduced in a cross-sectional view. The sliding door drive 1 has in this embodiment a three-part housing 2 on, with the case 2 in a lower part of the housing 3 , a central part 4th and a housing cover 5 divides. Through an opening 6th of the lower part 3 a drive motor, not shown, is insertable and with the housing 2 connectable. The drive motor engages a worm wheel, for example, with a worm arranged on an output shaft 7th , with the worm wheel 7th in this embodiment with a molded gear 8th as a sun gear for a downstream planetary gear 9 is executed. By means of the ring gear 10 of the planetary gear 9 is the force of the drive motor on a shaft 11 transferable. To do this is the wave 11 into a receiving opening 12 of the ring gear 10 insertable and with the shaft 11 form-fitting and / or non-positive connection. The wave 11 again is in the middle part of the housing 4th as well as in the housing cover 5 rotatably recorded. For this purpose, slide bearings are used in this exemplary embodiment 13 , 14th in the housing cover 5 and in the housing center part 4th arranged. The wave 11 is consequently in the housing at their axial ends 2 guided so that a tilting of the waves 11 in the sliding door drive 1 can be prevented.

On the wave 11 are in this embodiment two rope or winding drums 15th , 16 arranged the winding drums 15th , 16 are positive and / or non-positive with the shaft 11 connected and by means of a spring element 17th connected with each other. The winding drums 15th , 16 each serve to accommodate ropes, not shown, for driving a sliding door. The ropes of the winding drums 15th , 16 are attached to different ends of the sliding door so that the sliding door can be moved in different directions depending on the direction of rotation of the drive motor.

The wave 11 is preferably designed as a hollow shaft, but can be designed to be supported with a steel core. This is particularly advantageous when the shaft is made of a plastic. Depending on the design and requirements of the sliding door drive 1 can the wave 11 be made as a plastic component or from a metallic material. The wave 11 is in this embodiment in a recording 12 of the ring gear 10 insertable so that the shaft 11 by means of the ring gear 10 is drivable. The ring gear 10 is also in a plain bearing 19th in the middle part of the housing 4th recorded. In addition, the recording 12 with a steel bushing 20th be executed reinforced. By strengthening the recording and / or the wave 11 a safe, tilt-free and stable drive system for the sliding door can be provided. The plain bearings 13 , 14th , 19th for the ring gear 10 as well as the wave 11 stabilize the winding drums 15th , 16 in the housing 2 , so that the sliding door can be driven with the least possible play and / or drive losses.

An emergency operation of the sliding door drive 1 to enable is between the worm wheel 7th and the wave 11 additionally a clutch 21st arranged. Will the clutch 21st operated against the force of a circumferentially arranged spiral spring, not shown, with a sliding element of the coupling 21st in the direction of the arrow P1 is shifted, so the power transmission between the worm wheel 7th and the wave 11 interrupted, whereby a manual movement of the sliding door is possible and / or at least facilitated.

List of reference symbols

1

Sliding door drive

2

casing

3

Housing base

4th

Housing center part

5

Housing cover

6

opening

7th

Worm wheel

8th

Gear, sun gear

9

Planetary gear, epicyclic gear

10

Ring gear

11

wave

12th

admission

13, 14, 19

bearings

15, 16

Winding drum

17th

Spring element

18th

Steel core

20th

Rifle

21st

coupling

P1

arrow

A.

axis

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014109055 A1 [0003]
• DE 19819421 A1 [0004]
• US 4640050 [0005]

Claims (10)

Sliding door drive (1) for a motor vehicle with a drive unit comprising a housing (2), an electric drive, a gear (9) downstream of the drive and a coupling (21), with at least one winding drum arranged on a shaft (11) by means of the drive unit (15, 16) is drivable, characterized in that the shaft (11) is mounted at least twice in the housing (2), in particular at the axial ends of the shaft (11), in the housing (2). Sliding door drive (1) Claim 1 , characterized in that the housing (2, 3, 4, 5) is constructed in several parts, in particular in two or three parts. Sliding door drive according to one of the Claims 1 or 2 , characterized in that at least one bearing point (13, 14) of the shaft (11) is arranged in a housing cover (14). Sliding door drive (1) according to one of the Claims 1 to 3 , characterized in that two winding drums (15, 16) are arranged on the shaft (11). Sliding door drive according to one of the Claims 1 to 4th , characterized in that the winding drums (15, 16) are non-rotatably connected to one another and / or to the shaft (11) by means of a spring element (17). Sliding door drive (1) according to one of the Claims 1 to 5 , characterized in that the shaft (11) is directly connected to the gear (9), in particular to a planetary gear carrier (10) of an epicyclic gear (9), the planetary gear carrier (10) having a receiving means (12) for the shaft (11 ) having. Sliding door drive (1) according to one of the Claims 1 to 6th , characterized in that the receiving means (12) has a reinforcing element (20), in particular a metallic sleeve (20). Sliding door drive (1) according to one of the Claims 1 to 7th , characterized in that the shaft (11) is formed from plastic, the shaft (11) being provided with at least one metallic core (18). Sliding door drive (1) Claim 8 , characterized in that the metallic core (18) extends axially, at least in regions, into the region of the receiving means (12). Sliding door drive (1) according to one of the Claims 1 to 9 , characterized in that the shaft (11) is mounted in plain bearings (13, 14) in the housing (2, 3, 4, 5).

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