CN-122014809-A - Driving device

Abstract

The invention relates to a drive device comprising at least one drive unit having an output shaft (3) and a drive shaft (5) connected to the output shaft (3) by means of a damping device (4), wherein the damping device (4) comprises a housing (20) containing an arcuate spring assembly comprising a plurality of arcuate springs (18), the housing (20) being connected to the drive shaft (5) by means of a hub flange (22), the damping device (4) further comprising a flange connected to the arcuate springs (18), which flange is connected to one end of the output shaft (3), wherein an additional mass in the form of a flywheel (8) is arranged at the other end of the output shaft (3), characterized in that the flywheel (8) is part of a position detection device (9), the position detection device (9) being used for detecting the rotational position of the output shaft (3).

Inventors

• Richard. Ontrana
• HANNAPPEL RAINER

Assignees

• 舍弗勒技术股份两合公司

Dates

Publication Date

20260512

Application Date

20251013

Priority Date

20241111

Claims (6)

1. 1. Drive device comprising at least one drive unit with an output shaft (3) and a drive shaft (5) connected to the output shaft (3) by means of a damping device (4), wherein the damping device (4) has a housing (20), the housing (20) accommodating an arcuate spring assembly comprising a plurality of arcuate springs (18), the housing (20) being connected to the drive shaft (5) by means of a hub flange (22), the damping device (4) further having a flange connected to the arcuate springs (18), which flange is connected to one end of the output shaft (3), wherein an additional mass in the form of a flywheel (8) is arranged at the other end of the output shaft (3), characterized in that the flywheel (8) is part of a position detection device (9), the position detection device (9) being used for detecting the rotational position of the output shaft (3).
2. 2. A drive device according to claim 1, characterized in that the flywheel (8) has a structure (25), which structure (25) can be detected by a sensor element (10) fixedly arranged in position of the position detection device (9).
3. 3. Drive device according to claim 2, characterized in that the structure (25) is embodied as projections and/or recesses equally arranged around the circumference of the flywheel (8).
4. 4. A drive device according to claim 3, characterized in that the structure (25) is embodied in the form of a tooth (26), a through hole or an axially extending finger.
5. 5. A drive arrangement according to any one of the preceding claims, characterized in that the at least one drive unit is an internal combustion engine (2).
6. 6. Drive device according to any of the preceding claims, characterized in that the drive device is a hybrid drive device comprising a further drive unit in the form of an electric motor (12), wherein a clutch device (15) is provided, by means of which clutch device (15) the internal combustion engine (2) can be reversibly connected to the drive shaft (5).

Description

Driving device Technical Field The invention relates to a drive device comprising at least one drive unit with an output shaft and a drive shaft connected to the output shaft by means of a damping device, wherein the damping device comprises a housing which accommodates an arcuate spring assembly comprising a plurality of arcuate springs, the housing being connected to the drive shaft by means of a hub flange, the damping device further comprising a flange plate connected to the arcuate springs, the flange plate being connected to one end of the output shaft, wherein an additional mass in the form of a flywheel is arranged at the other end of the output shaft. Background DE102017127525A1 discloses a drive of this type, which is in the form of a hybrid drive. In motor vehicles, for example, having a hybrid drive comprising an internal combustion engine and an electric motor, there is a need to transmit the torque, which is generated in particular by the internal combustion engine, to the transmission in a low-vibration manner. This is achieved by means of a torque transmission device, which may be embodied in the form of or may comprise a vibration damping device, by means of which a sometimes oscillating torque provided by the internal combustion engine can be transmitted, in particular after damping, to a drive shaft leading to the transmission. The damping device comprises an input part and an output part, which are capable of relatively limited rotation under the opposing force of a circumferentially acting energy store configured as a curved spring, in the course of which kinetic energy is absorbed and transferred back to the drive train. Such a damping device can be implemented in the form of a conventional dual mass flywheel, comprising a primary part with a corresponding arcuate spring, which primary part is screwed to an output shaft of a drive unit, for example a crankshaft of an internal combustion engine. The secondary part is then connected to the drive shaft (i.e. the transmission input shaft) via a corresponding torque-proof connection (typically a hub). Alternatively, as disclosed in DE102017127525A1, a damping device known as a "reverse damper" can also be used, the structure or arrangement of the primary and secondary parts of which is reversed. In this embodiment, the housing accommodating the arcuate spring is a secondary part, which is connected to the drive shaft via a hub flange. The primary part connected to the output shaft (for example, a crankshaft) is embodied as a simple flange, which is connected to the arcuate spring via a corresponding drive. As disclosed in DE102017127525A1, in order to balance the relatively small moment of inertia of the damping device embodied as a "reverse damper" or of the primary part thereof, and in order to improve the vibration isolation of the output shaft (for example, a crankshaft), a flywheel is arranged on the other side of the output shaft in a rotationally fixed manner. It is also known to determine the position of the output shaft (i.e. the crankshaft) in order to obtain the ignition timing from a measured value, which is also included in the fuel injection control and other parameters allowing an optimal operation of the internal combustion engine. For this purpose, the position of the crankshaft must be precisely detected, which in turn indirectly reflects the position of the individual pistons, so that the control device can determine when the first cylinder is at top dead center, and thus precisely determine the ignition timing and the ignition sequence. Thus, a position detection device is provided, which is usually implemented as an incremental encoder. Incremental encoders typically include an encoder gear of correspondingly large diameter connected to the crankshaft, and a suitable incremental sensor that is fixed in position and scans the encoder gear past which it rotates. The encoder gear is usually embodied as a correspondingly large disk, i.e. with a correspondingly large diameter. However, such encoder disks connected to vibration dampers implemented as "inverse vibration dampers" can only be of light and thin construction or can only be designed to a small diameter, since the moment of inertia of the encoder disk is large compared to the moment of inertia of the vibration damper. Disclosure of Invention The object of the present invention is therefore to provide an improved drive device compared to this. In order to solve the above-mentioned technical problem, according to the present invention, in a driving device of the above-mentioned type, it is proposed that the flywheel is part of a position detecting device for detecting the rotational position of the output shaft. According to the invention, the flywheel for improving the vibration isolation effect is also used as a multifunctional component for the position detection device, i.e. the flywheel is also part of the position detection device. On the one hand, the flywheel