192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Reexamination Certificate
2000-09-27
2001-12-04
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
C192S003300, C192S070170, C192S212000
Reexamination Certificate
active
06325191
ABSTRACT:
The invention relates to a hydrodynamic torque converter with a pump wheel received in a housing, a turbine wheel and, if necessary, a stator wheel, with a converter bypass clutch having an axially displaceable piston, and a torsional vibration damper having an input part and an output part which are turnable relative to each other at least against the restoring force of energy storing elements which are disposed between them, as well as with a hub.
Such hydrodynamic torque converters became known, for example, from DE-OS 195 14 411. In such prior art torque converters, the turbine wheel comprises its own hub which is connected, with play, to an output hub by way of a motion transmitting gearing. The output part of the damper is connected with the output hub by means of rivets. This entails pronounced expenditures for assembly and necessitates the utilization of an increased number of different parts.
It is an object of the invention to provide a hydrodynamic torque converter of the above outlined character which can be produced in a simple manner-and can be assembled by resorting to fewer parts and installed at a reduced cost, but the satisfactory operability of the torque converter should be preserved. Furthermore, it is an object of the invention to provide a hydrodynamic torque converter which is constructed in a space-saving manner, of particular interest being especially the axial space requirements in view of the continuously decreasing availability of space for installation in the axial direction of the motor vehicle transmissions.
In accordance with the invention, this is accomplished in that the turbine wheel and the piston are non-rotatably connected with the input part of the damper and the input part of the damper is secured to the hub by a connection which exhibits an angular play, the output part of the damper being secured to the hub by a connection which is devoid of angular play.
Owing to the novel undertaking, one can ensure that the utilized component parts of the torque converter, inclusive of the damper and the converter bypass clutch, are of a relatively simple design as well as that the overall number of parts is small.
Various advantageous embodiments and further modifications of the invention, as well as further developments of the inventive concept, are set forth in the additional claims.
It is particularly expedient if the hub is provided with external teeth and the input part of the damper is provided with internal teeth mating with the external teeth of the hub with angular play to thus establish a connection with angular play, and if the output part of the damper is provided with internal teeth mating with the external teeth of the hub without angular play to thus establish a connection which is devoid of angular play.
The object of the invention is further accomplished in that, in a hydrodynamic torque converter with a pump wheel received in a housing, a turbine wheel and, if necessary, a stator wheel, with a converter bypass clutch having an axially displaceable piston, and a torsional vibration damper having an input part and an output part which are turnable relative to each other at least against the restoring force of energy storing elements which are disposed between them, as well as with a hub, the piston is non-rotatably connected with the input part of the damper and the input part is secured to the hub by a connection which exhibits an angular play, the turbine wheel being non-rotatably connected with the output part of the damper and the output part of the damper being secured to the hub by a connection which is devoid of angular play.
It is particularly advantageous in such a torque converter if the hub is provided with external teeth and the input part of the damper is provided with internal teeth which mate, with angular play, with the external teeth of the hub to thus establish a connection with angular play, as well as if the output part of the damper is provided with internal teeth which mate, without angular play, with the external teeth of the hub to thus establish a connection which is devoid of angular play.
It is particularly advantageous if the turbine wheel comprises an annular radially inner portion which is non-rotatably connected with the input or output part of the damper, and the turbine wheel further comprises a section extending in the axial direction, while the hub comprises a section extending in the axial direction and the turbine wheel is journalled on the hub by means of sections extending in the axial direction. For example, the arrangement can be such that the turbine wheel has freedom of angular movement through a preselectable angle relative to the hub. The turbine wheel is preferably centered in a radial direction by being journalled on the hub.
It is desirable that the damper comprise at least two disc-shaped elements which are turnable relative to each other against the restoring force of energy storing elements which are installed between them, one of the disc-shaped elements constituting the input part of the damper and another of the disc-shaped elements constituting the output part of the damper, the disc-shaped elements being mounted on the hub in such a way that they are coaxial with each other.
In accordance with a further inventive concept, it is of advantage if the input part of the damper is connected to or made of one piece with at least one element which projects in the axial direction and extends into openings of the output part. Such element can constitute a rivet or a bent-over lug which forms part of the input part and extends in the axial direction.
It is of advantage in such embodiment if, by coming into abutment with the surfaces at the ends of openings in the output part, the at least one axially projecting element of the input part limits the extent of angular movability of the input and output parts relative to each other.
It is of advantage if the extent of angular movability of the input and output parts relative to each other, in view of abutment of the at least one axially projecting element against the surfaces at the ends of openings in the output part, exceeds the extent of angular movability of the input part and the hub relative to each other.
It is further of advantage if, by eliminating the angular play between the input part and the hub as a result of angular movement of the input and output parts relative to each other, torque is being transmitted from the input part to the hub prior to reaching a maximal angular displacement between the input and output parts as a result of abutment of the at least one axially extending element of the input part against the surfaces at the ends of openings in the output part.
It is equally of advantage if the at least one axially projecting element is connected to or made of one piece with the output part and extends into openings of the input part.
Furthermore, it is of advantage if the at least one axially projecting element of the input or output part constitutes a rivet element which is form-lockingly connected with the input or output part.
In a hydrodynamic torque converter according to the invention, it is desirable that the at least one axially projecting element of the input or output part constitute a lug which is of one piece with the input or output part and is obtained by displacing some material of the input or output part.
It is also of advantage if the rivet element connects the input part and the turbine wheel radially inwardly of the vanes of the turbine wheel.
It is also of advantage if the axially shiftable piston of the converter bypass clutch comprises at least one element which projects in the axial direction and extends into a receptacle of the input or output part to form-lockingly connect such part with the piston.
It is also of advantage if the at least one axially projecting element constitutes a rivet element which is connected with the piston or with the input or output part.
It is also of advantage if the at least one axially projecting element which is formed from the sheet metal of the piston, or of t
Boman Wendy
Heck Thomas
Maienschein Stephan
Meisner Marc
Uhlmann Frank
Darby & Darby
Lorence Richard M.
LuK Getriebe-Systeme GmbH
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