DRIVE SYSTEM FOR OPENING AND CLOSING A MOTOR-VEHICLE DOOR, AND MOTOR VEHICLE HAVING THE DRIVE SYSTEM

Abstract

A drive system for a motor vehicle door is provided including an electric motor and a hinge for fastening the motor vehicle door. The hinge includes a door leaf, a body leaf for attachment to the body and a hinge pin arranged coaxially to the hinge axis and rotatably mounted on the body leaf. The electric motor includes a stator and a rotor arranged coaxially with the hinge axis in the stator and mounted rotatably about the hinge axis relative to the stator. The hinge pin is disposed in sections within the rotor, the rotor being coupled to the hinge pin in a gearless manner to transmit rotation. The drive system includes a tolerance ring arranged between the rotor and the hinge pin for transmitting the rotation from the rotor to the hinge pin, wherein the tolerance ring is coupled frictionally to the hinge pin or to the rotor.

Claims

1. A drive system for opening and closing a motor vehicle door comprising: a. an electric motor; and b. a hinge for fastening the motor vehicle door to a body of the associated motor vehicle to be rotatable about a hinge axis, i. wherein the hinge comprises a door leaf for rigid attachment to the motor vehicle door; ii. a body leaf for rigid attachment to the body; and iii. a hinge pin arranged coaxially to the hinge axis, rigidly fixed to the door leaf, and mounted on the body leaf rotatably about the hinge axis wherein c. the electric motor i. comprises a stator arranged coaxially to the hinge axis and ii. a rotor arranged coaxially to the hinge axis in the stator and mounted rotatably about the hinge axis relative to the stator; and iii. is configured to rotate the rotor at a speed in a speed operating range and with a torque to open and close the vehicle door in a torque operating range; d. wherein the hinge pin is arranged in sections in the rotor; e. wherein the rotor is coupled to the hinge pin in a gearless manner to transmit rotation; f. wherein the drive system comprises a tolerance ring arranged coaxially to the hinge axis between the rotor and the hinge pin for transmitting rotation from the rotor to the hinge pin; and g. wherein the tolerance ring is frictionally coupled to the hinge pin and/or to the rotor at least in the torque working range.

2. The drive system according to claim 1, wherein the drive system further comprises a rotation spring element coupled to the door leaf and to the body leaf to support an opening movement of the motor vehicle door.

3. The drive system according to claim 2, wherein the rotation spring element further comprises a torsion spring mounted coaxially to the hinge axis on the hinge pin.

4. The drive system according to claim 1, wherein a. the torque operating range of the electric motor extends from 1 Nm to 2 Nm; and/or b. the speed operating range of the electric motor extends from 0 rpm to 20 rpm.

5. The drive system according to claim 1, wherein the torque generated by the electric motor in the speed operating range is substantially independent of the speed of the electric motor.

6. The drive system according to claim 1, wherein the tolerance ring is configured to decouple the hinge pin from the rotor when the torque acting on the tolerance ring is above an overload torque.

7. The drive system according to claim 6, wherein the overload torque of the tolerance ring is from 2 Nm to 8 Nm.

8. The drive system according to claim 1, wherein the electric motor is configured to rotate the rotor at a speed in the speed operating range and at a torque for opening and closing the motor vehicle door in the torque operating range with a supply voltage of the electric motor of at most 24 V.

9. The drive system according to claim 1, wherein the electric motor a. has a diameter of 1 cm to 8 cm transverse to the hinge axis and/or b. has a length of 2 cm to 13 cm along the axis; and/or c. has an aspect ratio of the length to the diameter of from 1 to 5.

10. The drive system according to claim 1, wherein the drive system comprises a brake module for braking a rotation of the hinge pin.

11. The drive system according to claim 10, wherein the brake module further comprises an electrically controlled brake for automatically braking the rotation of the hinge pin in the event of a failure of a supply voltage of the electric motor.

12. The drive system according to claim 1, wherein the drive system further comprises a cooling module connected to the electric motor in a thermally conductive manner for cooling the electric motor.

13. The drive system according to claim 12, wherein the cooling module further comprises: a. an active cooling element for active cooling of the electric motor and/or b. a temperature sensor for measuring a temperature of the electric motor, the temperature sensor being communicatively connected to the active cooling element and/or to the electric motor.

14. A motor vehicle comprising a drive system according to claim 1 for opening and closing a motor vehicle door of the motor vehicle, wherein the motor vehicle comprises a linear spring element coupled to the motor vehicle door and to a body of the motor vehicle for supporting an opening movement of the motor vehicle door.

15. The motor vehicle according to claim 14, wherein the linear spring element further comprises a gas pressure spring and/or a coil spring.

Description

BRIEF DESCRIPTION

[0049] Some of the embodiments will be described in detail, with references to the following Figures, wherein like designations denote like members, wherein:

[0050] FIG. 1 schematically shows a drive system according to embodiments of the invention;

[0051] FIG. 2 schematically shows a motor vehicle according to embodiments of the invention; and

[0052] FIG. 3 schematically shows a motor vehicle with a drive system according to embodiments of the invention.

DETAILED DESCRIPTION

[0053] FIG. 1 schematically shows a drive system 200 according to embodiments of the invention for opening and closing a motor vehicle door (not shown) comprising an electric motor 110 and a hinge 210 for fastening the motor vehicle door 310 to a body (not shown) of the associated motor vehicle to be rotatable about a hinge axis A.

[0054] The hinge 210 comprises a door leaf 211 for rigid attachment to the motor vehicle door, a body leaf 212 for rigid attachment to the body, and a hinge pin 213 arranged coaxially with the hinge axis A, rigidly attached to the door leaf 211 and mounted rotatably about the hinge axis A on the body leaf 212.

[0055] The electric motor 110 comprises a stator 111 arranged coaxially with respect to the hinge axis A and a rotor 112 arranged coaxially with respect to the hinge axis A in the stator 111 and mounted rotatably about the hinge axis A relative to the stator 111. The stator 111 can be attached to the body, for example, by a stator coupling element (not shown).

[0056] The electric motor 110 is configured to rotate the rotor 112 at a speed in a speed operating range and with a torque to open and close the motor vehicle door 310 in a torque operating range.

[0057] The hinge pin 213 is arranged in sections in the rotor 112, wherein the rotor 112 is coupled to the hinge pin 213 in a gearless manner to transmit rotation.

[0058] The drive system 200 comprises a tolerance ring 140 arranged coaxially to the hinge axis A between the rotor 112 and the hinge pin 213 for transmitting the rotation from the rotor 112 to the hinge pin 213, wherein the tolerance ring 140 is frictionally coupled to the hinge pin 213 and to the rotor 112 at least in the torque working range.

[0059] The drive system 200 may comprise a rotational spring element 220 coupled to the door leaf 211 and to the body leaf 212 for assisting an opening movement of the motor vehicle door 310, comprising a torsion spring mounted on the hinge pin 213 coaxially with the hinge axis A.

[0060] FIG. 2 schematically shows a motor vehicle 300 according to embodiments of the invention, for example a passenger car, with a number of, for example two, drive systems 200 according to embodiments of the invention for opening and closing a motor vehicle door 310 of the motor vehicle 300, which is designed as a hatch.

[0061] The motor vehicle door 310 is connected to the body 320 of the motor vehicle 300 by a number of, for example two, hinges, each of which is part of one of the drive systems 200. For example, the drive system 200 is configured as the drive system 200 shown in FIG. 1.

[0062] The motor vehicle 300 comprises a number of, for example two, linear spring elements 330 coupled to the motor vehicle door 310 and to a body 320 of the motor vehicle 300 for supporting an opening movement of the motor vehicle door 310.

[0063] The linear spring elements 330 are, for example, each configured as a gas pressure spring, which may be arranged on both sides of the motor vehicle door 310.

[0064] FIG. 3 schematically shows a motor vehicle 300, for example a passenger car, with a drive system 200 according to embodiments of the invention for opening and closing a motor vehicle door 310 of the motor vehicle 300, which is designed as a side door.

[0065] The motor vehicle door 310 is connected to the body 320 of the motor vehicle 300 by a number of, for example two, hinges, one of which is part of the drive system 200, for example. The drive system 200 is, for example, designed like the drive system 200 shown in FIG. 1.

[0066] Although the invention has been illustrated and described in greater detail with reference to the exemplary embodiments, the invention is not limited to the examples disclosed, and further variations can be inferred by a person skilled in the art, without departing from the scope of protection of the invention.

[0067] For the sake of clarity, it is to be understood that the use of a or an throughout this application does not exclude a plurality, and comprising does not exclude other steps or elements.

TABLE-US-00001 List of reference signs 110 Electric motor 111 Stator 112 Rotor 140 Tolerance ring 200 Drive system 210 Hinge 211 Door leaf 212 Body leaf 213 Hinge pin 220 Rotation spring element 300 Motor vehicle 310 Motor vehicle door 320 Body 330 Linear spring element A Hinge axis