MXPA98001363A - Pump wheel for a torque converter - Google Patents

Abstract

The present invention relates to a pump impeller for a torque-driven hydrodynamic converter, comprising: a flange, a hub radially disposed within the flange to extend in an axial direction, and a sleeve connected by a press fit to the hub to extend in the direction of the hub and form a bearing seat, the sleeve is configured to form the hub

Description

PUMP WHEEL FOR A TURNING TORQUE CONVERTER Description of the Invention This invention relates to a pump wheel for a hydrodynamic torque converter, with a flange and a hub that is radially internal and extends in the direction axial, on which is configured a seat for a support. Such a pump wheel is known, for example, from German patent application DE 44 562 Cl. The pump wheel is driven by the crankshaft of an internal combustion engine, which is connected to the hub. In general, the pump wheel is configured as a metal sheet insert. Since the seat of the support is provided in the hub, it is necessary that the hub be worked in a correspondingly thin manner on its radially inner side or on its radially outer side. In addition, the bucket has to satisfy higher resistance requirements than the outer shell of the pump wheel. In order to economically satisfy these two requirements, in the case of the wheel of the known pump the hub is configured of a material different from that of the outer shell and is attached to the flange that is connected radially inside the shell externally through a rotary rub welding joint.

Furthermore, pump wheels are known in which the hub is directly welded to the outer shell or is formed in one piece with it. A welded joint has the disadvantage that it is necessary to pre-center the hub and flange with respect to one another. In addition, it is necessary to manufacture the welded joint very carefully to avoid a subsequent failure of the torque converter due to cracking of the weld seam or something similar. Because the hub can be deformed during the welding process, the construction of the support seat can only be carried out after both parts have been joined together. When doing this, the handling of the pump wheel is complicated due to its execution. From this approach of the problem, the invention proposes the task of simplifying the manufacture of the pump wheel. The solution to the problem is achieved by joining to the pump wheel, by means of a press fit, a bushing extending in the direction of the hub and forming the support seat. The bushing also has the advantage that it can be configured in such a way that it is very resistant to wear, so that it offers good protection against material clogging resulting from peripheral forces, for example from an oil pump impeller. The bushing is already completely finished machining when joined with the pump wheel, and it is only necessary to insert it in blows or under pressure. No further elaboration of the pump wheel is necessary. The bushing can be joined with the flange or with the hub, in case this was already conformed with the pump wheel. By calibrating the pump wheel a correspondingly suitable diameter is created to receive the bushing, while the accuracy of operation is a function of the bushing itself. The bushing can be mounted radially externally on the hub, if it is to form the seat for the inner ring of the bearing. In the case of pump wheels that are radially internally supported, and in which the hub forms the seat for the outer ring of the bearing, the bushing is inserted radially internally into the hub. Preferably, a seat for a joint is also formed on the bushing. If the bushing is provided with a flange protruding radially inwards from the pump wheel, then this flange no longer only serves as a stop for a secure axial attachment of the bushing to the pump wheel, but can also be formed on it the seat for an axial bearing. Preferably the bushing is provided with a notch to drive an oil pump. In this notch a drag projection of the drive wheel of the oil pump is attacked. Instead of providing a notch in the bushing to drive the oil pump, a pull finger or a flattened surface may also be provided on the bushing. It is also possible to configure the design of the drag point so that it corresponds to the opposite surface on the oil pump. With support in the drawing, the invention will be explained in more detail below on the basis of exemplary embodiments. It is shown: in Figure 1 the schematic representation of a first embodiment of a pump wheel in sectorial cut; in Figure 2 the schematic representation of a second embodiment of a pump wheel in sectorial cut; in Figure 3 the schematic representation of a third exemplary embodiment of a pump wheel in sectorial cut; in Figure 4 the schematic representation of a fourth embodiment of a pump wheel in sectorial cut. The wheel 1 of the pump is configured symmetrically with respect to the axis 10 of rotation, and consists essentially of the external shell 3, the blades 2 attached to the external shell 3, the flange 4 which is radially internally attached to the external shell 3 and, the cube 9. By means of a press fit, a bushing 7 forming the seat for the support 6, 6 'is connected to the wheel 1 of the pump. As shown in Figure 1, the bushing 7 can be mounted radially externally on the hub 9, and carry a joint 5 together with the bearing 6. In the case of this embodiment, the casing of the wheel 1 of the pump it is embedded in one piece. For this purpose, the region of the housing (external shell 3) for the arrangement of the vanes 2, as well as the hub 9, is configured during the drawing process. The bushing 7 is completely finished before being joined to the wheel 1 of the pump. Through a relief 8 of form the bushing 7 fits into a groove for the drive of the oil supply pump which is not shown here in greater detail. By means of this configuration and a corresponding selection of high quality materials, a burying or jamming of the projection of the drive wheel of the oil pump is effectively avoided. In the exemplary embodiment shown in FIG. 2, the bushing 7 is inserted into the hub 9 of the wheel 1 of the pump by beating or pressing radially internally. The bushing 7 is provided with a flange 14 protruding radially outwardly into the interior of the pump casing, and serving as a stop for the axial attachment of the bushing 7 to the flange 4 of the wheel 1 of the pump. The flange 14 is bent axially in its radially external part, and forms a seat 11 for an axial bearing 12. In the case of this embodiment, the seat for the support 6 'is radially internally configured in the bushing 7. In the embodiment shown in FIG. 3, the bushing 7 simultaneously constitutes the hub 9. While the seat of the bearing 6 is configured radially externally on the sleeve 7, the seal 5 is disposed on an extension of the flange 4 bent in the axial direction. This arrangement guarantees absolute sealing of the oil to the outside. In the notch 13, it is possible to lock the projection of the drive wheel (not shown) of the oil pump. The bushing 7 can also be inserted under pressure in the wheel 1 of the pump through a "toothing of the mouse"; this is only provided in the bushing in the bent extension of the flange 4. As shown in Figure 4, the axial bearing 18 can furthermore be placed radially internally in the seat 11 of the flange 14. Preferably the flange 14 simultaneously constitutes a bearing surface of the bearing 12, so that a component of the bearing can be saved.

List of reference symbology 1 Pump wheel 2 Pallet 3 External shell 4 Flange 5 Seal 6 Bearing 6 'Coj inete 7 Bushing 8 Notch 9 Hub 10 Spindle 11 Seat 12 Axial bearing 13 Slot 14 Flange 15 Drag finger 16 Flattened surface 17 Bearing surface 18 Axial bearing

Claims (1)

1. CLAIMS Pump wheel for a hydrodynamic torque converter with a flange and a hub that is radially internal and extends in the axial direction, on which a seat is formed for a bearing, characterized by the pump wheel a bushing that extends in the direction of the hub and forms the bearing seat is press-fitted. Wheel of the pump according to claim 1, characterized in that the bushing is connected to the flange. Wheel of the pump according to claim 1, characterized in that the bushing is connected to the hub. Wheel of the pump according to claim 1, characterized in that the bushing constitutes the hub. Wheel of the pump according to claim 3, characterized in that the bushing is mounted radially externally on the hub. Pump wheel according to claim 3, characterized in that the bushing is inserted radially internally in the hub. Pump wheel according to one or more of the preceding claims, characterized in that a seat for a gasket is configured in the bushing. The pump wheel according to claim 3, characterized in that the bushing is provided with a flange that projects radially towards the inside of the pump wheel. Wheel of the pump according to claim 8, characterized in that the flange forms a seat for an axial bearing. Wheel of the pump according to claim 1, characterized in that the bushing is provided with a notch for driving an oil pump. Wheel of the pump according to claim 1, characterized in that the bushing is provided with at least one driving finger for the drive of an oil pump. The pump wheel according to claim 1, characterized in that the bushing is provided with at least one flattened surface for driving an oil pump. Wheel of the pump according to claim 8, characterized in that the flange forms a bearing surface for an axial bearing.