Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Reexamination Certificate
1999-04-13
2001-03-13
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
Reexamination Certificate
active
06200222
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a two part flywheel having a torsional vibration damper, in particular for installation in the drive train of a motor vehicle.
2. Background Information
To damp torsional vibrations in the drive train of a motor vehicle, German Utility Model 94 14 314 describes a flywheel which has two inertial masses. A first inertial mass system is fastened to the crankshaft of an internal combustion engine and a second inertial mass system is mounted so that it can rotate on the first inertial mass system and simultaneously form a friction surface of a friction clutch. The two inertial mass systems are connected to one another with rotational elasticity by means of a spring system. There is also a third inertial mass system which can rotate around the common axis of rotation of the two inertial mass systems. The third inertial mass system is in the form of a planet carrier or a ring gear of a planetary gear train. The sun wheel is non-detachably connected to the first inertial mass system and is engaged in the conventional manner with at least one planet wheel. The planet wheel can rotate on the common axis of rotation axially parallel to the planet carrier. To the extent that the planet carrier is used as the third inertial mass, the planet wheels are engaged with the ring gear which is then non-detachably fastened to the second inertial mass system. In embodiments in which the ring gear forms the third inertial mass, the planet carrier of the planetary gear train is a component of the second inertial mass system. Known flywheels which have a plurality of inertial masses are comparatively complex and require a relatively large amount of space in the axial and/or radial direction for the installation of the components of the planetary gear train. Additionally, the mounting of the third inertial mass is difficult because the central area of the system of inertial masses is required for the installation of a number of components of the torsional vibration damper, in particular for the installation of the bearing which is used to mount the second inertial mass system on the first inertial mass system, as well as for the installation of friction devices, if such friction devices are present. The rotational mounting of components such as a ring gear, for example, on a relatively large diameter is also problematic.
An additional flywheel which has multiple inertial masses is described in German Patent No. 195 17 605. On this flywheel, a first inertial mass system is rotationally elastically coupled by means of a spring system with a second inertial mass system. The second inertial mass system is mounted so that it can rotate relative to the first inertial mass system. The first inertial mass system also forms the ring gear of a planetary gear train which is coaxial to the axis of rotation of the crankshaft. The sun wheel of the planetary gear train is rotationally mounted on the crankshaft and is driven by means of the planet wheels which are engaged with the sun wheel and the ring gear. The planet wheels are also mounted on a planet carrier which is non-detachably connected to the engine and rotates in the direction opposite to the direction of rotation of the crankshaft. A third inertial mass which is non-detachably connected to the sun wheel ensures compensation for irregularities in the rotation of the crankshaft.
OBJECT OF THE INVENTION
The object of the present invention is to create a flywheel having a torsional vibration damper which has a plurality of inertial masses, which can be realized more easily and more economically than similar known devices, and which can be kept relatively compact.
SUMMARY OF THE INVENTION
The present invention teaches that in one preferred embodiment, this object can be accomplished by an arrangement in which a first and second inertial mass system are installed so that they can rotate both together and relative to one another around a common first axis of rotation. The first and second inertial mass systems can be rotationally elastically connected to one another by means of a spring system. A third inertial mass system can be movable relative to the first and second inertial mass systems. The third inertial mass system is in a rotational drive connection with the first and/or second inertial mass systems by means of a transmission system. One of the inertial mass systems, in particular the first inertial mass system, is designed to be connected to the crankshaft of an internal combustion engine.
The present invention further teaches that the inertial mass of the third inertial mass system can be defined essentially exclusively by a plurality of inertial masses which rotate around the first axis of rotation. Each of the inertial masses can be rotated or pivoted around a corresponding respective second axis of rotation which is offset axially parallel from the first axis of rotation. Each of the inertial masses can be driven in a pivoting or rotating motion around its second axis of rotation by the transmission system as a function of the relative rotational movement between the first and second inertial mass systems.
The present invention teaches that the construction of a flywheel which has a plurality of inertial masses can be simplified and the installation space required for the flywheel which has a plurality of inertial masses can be reduced if, instead of a third inertial mass system which can rotate around the first axis of rotation, the inertial mass of the third inertial mass system is distributed among a plurality of inertial mass bodies which are offset from one another in the peripheral direction. Not only can the space available be better utilized by this distribution of the inertial masses, but the mounting of the individual inertial mass bodies can also be simplified.
The inertial mass or centrifugal mass of the inertial mass bodies is determined on one hand by their rotation around the second axis of rotation, and on the other hand by the movement with which they circulate around the first axis of rotation in the event of a relative rotation between the first and second inertial mass systems. The inertial mass bodies must be guided for both components of movement relative to the first and second inertial mass systems. In a first embodiment, the present invention teaches that the inertial mass bodies are provided over at least a portion of their periphery with toothing, gearing or gear teeth which can be concentric to the corresponding second axis of rotation. The inertial mass bodies are mounted on the first inertial mass system so that they are stationary relative to the first inertial mass system. The second inertial mass system comprises mating or matching toothing, gearing or gear teeth which is concentric to the first axis of rotation and is engaged with the toothing.
The inertial mass bodies can be mounted on journals which are non-detachably connected to the first inertial mass system. The journals may also form a solid unit with the corresponding inertial mass bodies. The inertial mass bodies can have teeth around their entire peripheral surface in the manner of gear wheels. For smaller relative angles of rotation between the first and the second inertial mass systems the toothing can also be restricted to a portion of the periphery. In the latter variant, the area of the inertial mass bodies which is not used for the toothing can be used to increase the size of the inertial mass. The mating toothing which is engaged with the toothing of the inertial mass bodies can be provided exclusively on the side of the inertial mass bodies which faces radially away from the first axis of rotation or exclusively on the side which faces radially toward the first axis of rotation. When the mating toothing is located on the side of the inertial mass bodies which faces radially away from the first axis of rotation, a larger angular acceleration of the inertial mass bodies can be achieved than in the other case. The relatively low rotational acceleration o
Binda Greg
Browne Lynne H.
Fichtel & Sachs
Nils H. Ljungman & Associates
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