Patent Application
20240060337
This application claims priority to German Patent Application No. 10 2022 121 042.1, filed Aug. 19, 2022, the content of such application being incorporated by reference herein in its entirety.
The present invention relates to a device for door unlocking in a vehicle.
Door unlocking systems of vehicle doors with mechanical actuating elements are known in numerous variations. Generally, by actuating a lever-like handle, a Bowden cable is pulled, which unlocks the door. A less common variant is actuating elements with band portions, in particular with actuating loops for door unlocking. The actuating loop operates the lock Bowden cable by means of a deflection lever, or is deflected by a deflection roller, in order to directly unlock the door in very small design spaces. When the actuation is done directly via a deflection roller with a small diameter, high forces are applied for the unlocking. Due to the friction created at the deflection points, the force requirement is increased considerably, and the actuating loop also undergoes damaging stress.
CN 109695385 A, which is incorporated by reference herein, discloses an interior door actuation with an opening handle made of a soft material for the door unlocking of a vehicle door. CN 211776653 U, which is incorporated by reference herein, describes an interior door actuation with a tensile band-like opening handle for unlocking vehicle doors.
According to aspects of the invention, the device for door unlocking comprises an actuating element consisting of an actuating portion and a flexibly unwindable band portion connected to a Bowden cable. The Bowden cable and the actuating element are arranged on a base plate and/or on a door. The actuating element is connected to a rotatably arranged loop lever in such a way that, upon rotation of the loop lever by the actuating element, the Bowden cable connected to the loop lever is movable. The loop lever preferably has a circular loop lever portion, against which the band portion partially abuts. Through the abutment of the band section against the rotatable loop lever, the deflection about a component is avoided, so that no friction arises and wear on the band section is minimized as much as possible. The abutment of the band section against the loop lever and/or the partitioning of the actuating element into the actuating portion and band portion allow the use of haptically appealing materials, which have a lower component strength, for example. With the loop lever, in contrast to a deflection of the band portion, the lever arm can be enlarged so that the actuating force can be increased. The actuating element can preferably be made of a polymeric material or a textile material. This provides the operator with a comfortable haptic feeling when gripping and actuating the actuating portion. The actuating element or one of the two portions of the actuating element can also be produced from a combination of different materials. By weaving in fibers, the design or properties of the actuating element can be influenced. In order to exploit further weight-saving potentials, surrounding components or functions can be integrated into the base plate. The cover on the base plate can be used as a guide for the actuating element or for the purpose of selectively introducing design elements. In a preferred configuration, the base plate has advantageous component properties due to rib-like structures.
According to an advantageous configuration of the invention, a Bowden cable lever, which is rotatably arranged on the base plate and/or the door is connected to the loop lever via a coupling rod such that, when the loop lever is rotated by the actuating element, the Bowden cable connected to the Bowden cable lever is movable. The loop lever can be rotatable about a first loop lever axis, and the Bowden cable lever can be rotatable about a second Bowden cable lever axis. The axes of the loop lever and the Bowden cable lever can be supported with the aid of bearing bushings in order to reduce friction in the joints. With the Bowden cable lever, a second lever arm can be configured so as to further reduce the actuating force in addition to the first lever arm of the loop lever. By kinematically connecting the loop lever, the coupling rod, and the Bowden cable lever, a noticeable threshold during actuation can be integrated. The operator receives a haptic feedback as to when the door unlocking has been successfully activated. This provides an improved feeling during the unlocking process.
According to a further advantageous configuration of the invention, the actuating portion and the band portion are integrally connected. Due to the integral configuration of the actuating element, no additional connecting elements are required, and thus no weak points are present in the actuating element.
According to a further advantageous configuration of the invention, the actuating portion is configured to be loop-shaped or hook-shaped. The actuating portion can have different shapes for gripping. It can be configured as a band, cable, toggle, handle, or knob, for example. In a preferred configuration, the actuating portion can be folded over at the end for gripping the actuating element and connected in a materially locking manner by forming a first connection.
As a result, a secure connection can be created without additional intermediate elements. According to a further advantageous configuration of the invention, the band portion of the actuating element is fastened to the first loop lever axis. By using the first loop lever axis simultaneously as the rotational axis of the loop lever and as a band portion for fastening the actuating element, additional fastening elements or connecting points are omitted, so that additional weight can be saved. The band portion can be folded over at the end for fastening to the rotational axis of the loop lever and can be connected in a materially locking manner. As a result, a secure connection can be created without any additional intermediate elements.
According to a further advantageous configuration of the invention, a spring for retrieving the actuating element is arranged between the base plate and/or the door and the loop lever or the Bowden cable lever. The spring is tensioned when the actuating element is pulled and brings the actuating element back into the home position after the actuation.
According to a further advantageous configuration of the invention, a microswitch is provided, which is actuated by a rotation of the loop lever or the Bowden cable lever at a first angle such that an electrical control for lowering of the door window panes and/or an electrical door lock takes place. The actuation of the microswitch can be configured so as to electrically unlock the door prior to the mechanical unlocking. The actuation for the operator is thereby more comfortable, because the actuating element does not have to be fully pulled out, and a necessary actuating force is only applied for a short time.
According to a further advantageous configuration of the invention, upon a rotation of the loop lever or the Bowden cable lever by a second angle that is greater than the first angle, the door unlocking is carried out mechanically via the Bowden cable. For an electrical unlocking system, the mechanical unlocking function serves as an emergency release when the door unlocking system is used in the event of a failure of the microswitch or the power supply. Furthermore, additional functions can be implemented when actuating the microswitch, such as a window pane lowering when actuating the door unlocking. The mechanism of the interior door actuation, which is arranged downstream of the microswitch, can also be omitted entirely in the case of a purely mechanical lock in order to take advantage of further potential for weight savings.
According to a further advantageous configuration of the invention, the device comprises a second spring arranged on the base plate and/or on a door, having a second cam arranged on the Bowden cable lever for forming a haptic force threshold between the mechanical and electrical door unlocking systems. The second spring cooperates with the cam portion in such a way that, by applying a higher force, the second spring abutting the Bowden cable lever bottom slips over the cam portion upon rotation of the Bowden cable lever about the second Bowden cable lever axis. The second spring has a U-shaped profile. In the assembled state, the second spring is prestressed, and the closed portion of the second spring abuts against the Bowden cable lever bottom. The second cam is arranged on the Bowden cable lever bottom and has a cam portion. The cam portion has a pitch facing away from the Bowden cable lever bottom. When the loop lever is rotated, a rotational movement of the Bowden cable lever occurs about the second Bowden cable lever axis. The cam portion rotates against the closed portion of the second spring. A further rotational movement is only possible by applying a higher force. By applying the higher force, the second spring slips over the cam portion, and the lock is mechanically unlocked upon further rotation. The mechanical actuation is thereby noticeably separated from the electrical actuation. The operator receives improved haptic feedback during the actuation operation.
According to a further advantageous configuration of the invention, the coupling rod comprises at least one bend or a flexure. Due to the limited design space, a direct connection of the loop lever and the Bowden cable lever cannot always be implemented. With a bend or a flexure, the coupling rod can be better adapted to the existing design space. The coupling rod is preferably made of a metallic or a polymeric material.
In the following, the invention will be explained in further detail with reference to several figures.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2022 121 042.1 | Aug 2022 | DE | national |
