Patent Application
20210086854
The present application is related and has right of priority to German Patent Application No. 10 2019 214 349.0 filed on Sep. 20, 2019, which is incorporated by reference in its entirety for all purposes.
The invention relates generally to an assembly device for inserting a stator of an electric machine, which is an integral part of a hybrid drive module, into a bell-shaped transmission housing, wherein a rotor of the electric machine is at least indirectly connected, via a rotor carrier as well as a rotor hub, to a transmission input shaft, and a stator of the electric machine, extending concentrically to the rotor and radially surrounding the rotor, is securable at the transmission housing.
Moreover, the invention also relates generally to a hybrid drive module and an assembly device for inserting a stator of an electric machine, which is an integral part of the hybrid drive module, into a bell-shaped transmission housing, which radially surrounds the hybrid drive module, wherein a rotor of the electric machine is at least indirectly connected, via a rotor carrier as well as a rotor hub, to a transmission input shaft, and a stator of the electric machine, extending concentrically to the rotor and radially surrounding the rotor, is secured at the transmission housing.
Finally, the invention also relates generally to a method for mounting a stator of an electric machine, which is an integral part of a hybrid drive module, into a bell-shaped transmission housing, into which a rotor has already been inserted.
With respect to a type of hybrid drive train of a motor vehicle, the electric machine is arranged in a part of a transmission housing designed in the form of a clutch bell housing, wherein a stator of the electric machine is inserted into the clutch bell housing of the transmission housing in a rotationally fixed manner. A rotor of the electric machine, which is centrally arranged within the stator, is connected to a primary part of a torque converter in an automatic transmission and, in a manual transmission, is connected to a clutch unit, which is formed by a multi-disk clutch.
In order to achieve a compact, installation space-saving arrangement, upon utilization of a multi-disk clutch, the clutch disk pack and a clutch actuating unit can be arranged, viewed spatially, radially within the extension of the rotor. With a torque converter, the radial space within the rotor is utilized for accommodating a torque converter lockup clutch. The clutch bell housing is closed toward the internal combustion engine with the aid of a bearing shield.
A bell-shaped transmission housing, which accommodates, in an interior of the bell-shaped transmission housing, a hybrid drive module essentially made of an electric machine and a torque converter or at least one separating clutch, is known from the document DE 10 2018 200 569 B3. In that case, a bearing shield, which is flange-mounted onto the transmission housing and is secured via bolts, is fitted into the transmission housing via an axially extending, sleeve-like section, which accommodates a stator of the electric machine. In addition, the bearing shield is provided with a precentering unit for facilitating the mounting of the hybrid module onto a crankshaft of an internal combustion engine. The bearing shield separates a wet space of the hybrid drive module from a dry space, wherein the seal of the wet space with respect to the dry space takes place with the aid of a sealing ring, which is arranged in the bearing shield and directly next to the precentering unit.
In addition, DE 10 2017 218 743 A1 describes a method for connecting a torque converter unit to a transmission, wherein the torque converter unit is an integral part of a hybrid drive module. In a first exemplary embodiment, a rotor of an electric machine is connected via a rotor carrier to the torque converter unit, and the rotor carrier accommodating the rotor extends, starting from a torque converter shell, in the axial direction. Before the assembly process is carried out, a stator of the electric machine is mounted at a fixing plate, which extends transversely to a shaft arrangement of the hybrid drive module and is connected to a transmission housing. The torque converter unit and, therefore, the rotor are inserted into the transmission housing with the aid of an assembly fixture, which engages at the torque converter unit via a first assembly tool and a second assembly tool with opposing forces. The first assembly tool is accommodated by a groove of an input section of the torque converter. The second assembly tool rests against the torque converter shell via an offset compensation element. In this way, the torque converter unit is grasped at an end face of the torque converter unit by the assembly device and can be inserted into the interior of the bell-shaped transmission housing. In the installed condition, the rotor surrounds the radially inward lying stator. One further exemplary embodiment differs from the previously explained exemplary embodiment in terms of the arrangement of the rotor, which is surrounded by the stator fixed in the transmission housing.
Example aspects of the present invention create an assembly device for an arrangement of a hybrid drive module having the features of a generic type, with the aid of which a reliable installation of the stator is made possible, once an essential component of the hybrid drive module, which is connected to the rotor, has been arranged within the transmission housing.
Accordingly, an assembly device is utilized for inserting a stator of an electric machine into a bell-shaped transmission housing. The electric machine, which is an integral part of a hybrid drive module, includes a rotor, which is at least indirectly connected to a transmission input shaft via a rotor carrier and a rotor hub. In addition, a stator of the electric machine, extending concentrically to the rotor and radially surrounding the rotor, is securable at the transmission housing.
According to example aspects of the invention, the assembly device includes an inner guide element, which is intended to be guided, in a form-locking manner, with respect to the rotor hub or at least indirectly with respect to the transmission input shaft accommodating the rotor hub. Another integral part of the assembly device is an outer guide element, with the aid of which the assembly device is guided, in a form-locking manner, at the transmission housing. The two guide elements are radially spaced apart from each other and are fixed to each other with the aid of at least one radially extending connecting element. At least one sliding member is longitudinally displaceably guided in the connecting element, wherein the sliding member includes two sliding member parts, which are adjustable with respect to each other, of which a first, radially outer sliding member part is provided for a form-locking engagement at the outer circumference of the stator and a second, radially inner sliding member part is provided for an engagement at an end face of the stator.
With the aid of the two guide elements, therefore, the transmission input shaft including the rotor is centerable with respect to the transmission housing, on the one hand, and the assembly device can be aligned at the transmission housing, on the other hand. Therefore, the assembly device engages, in a form-locking manner, at the transmission housing as well as at the transmission input shaft. This does not need to be a direct engagement at the transmission input shaft; instead, the inner guide element, which is preferably designed, at least partially or in sections, as a sleeve, can also enclose a hub or hollow shaft arranged on the transmission input shaft.
The connecting element extending radially between the guide elements can be designed as a disk, wherein at least one opening is provided in the disk for accommodating the at least one sliding member, which is moved in parallel to the longitudinal central axis of the overall arrangement. The two sliding member parts are movable with respect to each other in such a way that the stator is grasped thereby and is brought into a certain position—with regard to the radial position and the position in the direction of rotation—with respect to the transmission housing. Alternatively to the design of the connecting element as a disk, the connecting element can also be designed including individual radially extending struts.
In one further example embodiment of the present invention, it is provided that centering pins extend axially from the outer guide element, wherein the centering pins are provided for an engagement in through-bores of the transmission housing, which extend in a mounting flange formed at the transmission housing. These centering pins are therefore utilized for centering the assembly device and the stator accommodated by the assembly device with respect to the transmission housing, wherein the centering pins are introduced into the appropriate bore holes, which are preferably designed as through-bores. The bore holes can be structurally provided for a subsequent fixing of a bearing shield at the transmission housing.
In addition, it is provided that the second sliding member part is provided for a form-locking engagement into the end face of the stator, whereby the stator, in a certain rotational position with respect to the transmission housing, is insertable into the transmission housing. The second sliding member part can be provided with positioning pins extending in the axial direction, which are provided for an engagement in centering bore holes of the stator.
The form-locking engagement of the first sliding member part at the outer circumference of the stator can be designed, in a further example embodiment of the invention, in such a way that the first sliding member part is couplable, in the manner of a bayonet, to a driving surface provided at the outer circumference of the stator. The driving surface is formed, in this case, by individual surface segments protruding radially above the outer circumference of the stator and pointing in the axial direction, wherein engaging pieces provided at the first sliding member part and directed radially inward are turned into a position in which the engaging pieces engage behind the individual surface segments and, in this way, fix the stator between themselves and the positioning pins.
In addition, the first sliding member part and the second sliding member part can each be designed, at least partially or in sections, to be hollow-cylindrical, wherein the second sliding member part is displaceably guided in the first sliding member part, and wherein claws extending in the axial direction protrude from the first sliding member part.
Example aspects of the invention also provide a hybrid drive module and an assembly device for inserting a stator into a bell-shaped transmission housing radially surrounding the hybrid drive module. The stator is an integral part of an electric machine provided in the hybrid drive module. A rotor of the electric machine is at least indirectly connected to a transmission input shaft via a rotor carrier and a rotor hub, while its stator, extending concentrically to the rotor and radially surrounding the rotor, is secured at the transmission housing.
According to example apsects of the invention, the assembly device is to include an inner guide element, which is guided, during an assembly process, in a form-locking manner with respect to the rotor hub or the transmission input shaft accommodating the rotor hub. In addition, the assembly device is guided, in a form-locking manner, at the transmission housing with the aid of an outer guide element, wherein the two guide elements are radially spaced apart from each other and are fixed to each other with the aid of at least one radially extending connecting element. At least one sliding member designed as a dog or claw is longitudinally displaceably guided in the connecting element and accommodates the stator and guides the stator with respect to the rotor hub and/or the transmission input shaft as well as with respect to the transmission housing.
With respect to the hybrid drive module and the assembly device cooperating therewith, in addition, the sliding member is to include two sliding member parts, which are adjustable with respect to each other, of which a first, radially outer sliding member part engages in a form-locking manner at the outer circumference of the stator and a second, radially inner sliding member part engages at an end face of the stator.
In addition, the stator is to include bulges at an external shell surface of the stator, which extend, in the manner of ribs, across a substantial portion of the axial length of the stator and form bolting-on surfaces at rear-side ends of the bulges, wherein tabs extending in the circumferential direction protrude from a front section of the bulges and are each engaged from behind at a driving surface by the outer sliding member part. At the end of the assembly process, the stator is secured, via these bulges, which are provided in laminated cores of the stator, at bolting-on surfaces of the transmission housing, which is why through-bores extend within the bulges. A tab protrudes from each of these bulges, which is preferably designed having a shorter axial length than the bulge, wherein an end face of the tab is engaged from behind by the particular engaging piece of the first sliding member part.
In addition, the tabs are to include centering bore holes extending in the axial direction, into which positioning pins of the second sliding member part and locating pins extending from the transmission housing in the mounted condition of the stator engage during the assembly process. The centering bore holes penetrate the tabs and are designed to be slightly longer than the positioning pins, and so the centering bore holes can be threaded onto the centering pins from one end, although the positioning pins of the second sliding member part are engaged at the other end. In addition, the assembly device can be designed in the previously explained way.
Example aspects of the invention also provide a method for installing a stator of an electric machine, which is an integral part of a hybrid drive module, into a bell-shaped transmission housing. A rotor has already been inserted into the transmission housing in this case.
According to example aspects of the invention, the stator is initially grasped by two sliding member parts of an assembly device at an end face and at a driving surface provided at the outer circumference of the stator, and is aligned in the radial direction as well as in the circumferential direction with respect to the assembly device. The latter takes place with the aid of positioning pins, which engage into centering bore holes of tabs.
In a second method step, the assembly device is then centered in front of the end of the transmission housing, wherein an outer guide element is aligned with the aid of bore holes provided in a flange of the transmission housing, and a rotor hub and/or transmission input shaft are/is centered at an inner guide element.
In a third method step, a sliding member formed by the two sliding member parts displaces the stator into the radial space between the rotor and the transmission housing until the centering bore holes provided at the stator have been slid onto centering pins, which protrude from the transmission housing.
In a fourth method step, the stator is bolted to the transmission housing with the aid of axially extending bolts. Appropriate bore holes for accommodating the bolts extend next to the centering bore holes, in parallel thereto.
Finally, in a fifth method step, the assembly device is initially separated from the stator and, thereafter, from the transmission housing and the rotor hub and/or the transmission input shaft.
The invention is not limited to the specified combination of features of the independent claims and the claims dependent thereon. In addition, individual features can be combined with one another, provided they arise from the claims, the description of preferred embodiments of the invention which follows, or directly from the drawings. References in the claims to the drawings via the use of reference signs is not intended to limit the scope of protection of the claims.
One advantageous embodiment of the invention, which is explained in the following, is represented in the drawings. Wherein:
Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example, features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.
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The engaging pieces 35 formed at the extensions 34 of the first sliding member element 31 can be pivoted so far that the engaging pieces 35 can engage behind the driving surfaces 27. Thereafter, the assembly device 29, together with the stator grasped thereby, is centered in front of the end of the transmission housing 1. As a result, the centering pins 41 are inserted into the bore holes 14 and the inner guide element 38 indirectly engages at the transmission input shaft 6, in order to be centered at the transmission input shaft 6 and the drive elements arranged thereon, and, therefore, according to
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Modifications and variations can be made to the embodiments illustrated or described herein without departing from the scope and spirit of the invention as set forth in the appended claims. In the claims, reference characters corresponding to elements recited in the detailed description and the drawings may be recited. Such reference characters are enclosed within parentheses and are provided as an aid for reference to example embodiments described in the detailed description and the drawings. Such reference characters are provided for convenience only and have no effect on the scope of the claims. In particular, such reference characters are not intended to limit the claims to the particular example embodiments described in the detailed description and the drawings.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 214 349.0 | Sep 2019 | DE | national |
