JP2018511759A - Especially drive unit of transmission actuator - Google Patents

Abstract

In particular, a drive unit for a transmission actuator, comprising an electric motor disposed in a housing, the electric motor comprising a stator group having a plastic insert molding part, and a rotor group supported by two rolling bearings And a bearing support for holding one of the rolling bearings. The bearing support supports the plastic insert molding portion in the axial direction of the electric motor and is screwed to the housing.

Description

  The present invention relates to a drive unit suitable for a transmission actuator, particularly a one-motor transmission actuator, and more particularly to a drive unit having an electric motor in the form of an electronic rectifying motor. Furthermore, the invention relates to a method for assembling such a drive unit.

  An actuator configured as a one-motor transmission actuator for a motor vehicle transmission and the associated operating method are disclosed, for example, in DE 102006054901. The electric motor of this transmission actuator, which is controlled by the control device, drives the threaded spindle via a gear stage. An eccentric device that is pivotable relative to a threaded spindle is configured to produce axial movement of a shift shaft of an automobile transmission.

  Another one-motor transmission actuator is disclosed, for example, in German Offenlegungsschrift 10,012,203,871. In this case, a select pot having a slide track is provided to convert the rotational motion into a translational motion, that is, a select motion. The rotational movement is branched off from the spindle drive. The same spindle driving device is also disclosed in DE 102006054901 in which the rotational movement of the spindle is first converted into the translational movement of the spindle nut, and from this translational movement, the rotational movement is again effected via the rack transmission. In other words, it is used to form a turning motion of the shift shaft, that is, a shift motion.

  The problem underlying the present invention is that a drive unit, particularly suitable as a component of a transmission actuator, is compared between the manufacturing accuracy and the assembly costs, especially in the context of industrial mass production, with respect to the background art described above. To improve the relationship.

  This object is solved according to the invention by a drive unit having the features of claim 1 and a method for assembling the drive unit of claim 10. In the following, the configurations and advantages described with respect to the assembly method also apply to the device, i.e. the drive unit, and vice versa.

  An electric motor is arranged in the housing of the drive unit, and the electric motor is composed of a stator configuration group and a rotor configuration group. In this case, the rotor configuration group is composed of two rolling bearings, particularly ball bearings, It is pivotally supported by a stator group. The rolling bearing of one of the two rolling bearings, specifically the outer ring of the corresponding rolling bearing, is held by a bearing support, which is screwed to the housing of the drive unit. Furthermore, the bearing support supports the plastic insert molding portion of the stator group in the axial direction of the electric motor. The bearing support forms a cover of the housing at the end face of the housing. From this end face, the stator component group and the rotor component group can be fitted into the housing as a pre-assembled stator / rotor / component unit. The stator group and the rotor group are collectively referred to as electrical and electromagnetic drive components. This is true even when the rotor is not equipped with a permanent magnet, but when the rotor is configured as a rotor of a reluctance motor, for example. In this case, the rotor manufactured from the magnetically permeable material has a convex portion and a concave portion in the radial direction with respect to the stator in the region of the rotor lamination portion.

  The electronic components provided for controlling the electrical and electromagnetic drive components are preferably housed in a partial chamber of the housing. This partial chamber is partitioned from the partial chamber in which the electrical drive components are located. In this case, both partial chambers of the drive unit are open towards the opposite end face of the housing. In accordance with this, the partition planes that partition both partial chambers from each other are arranged perpendicular to the rotation axis of the electric motor. The actual partition between the partial chambers does not have to extend exactly in a single geometric plane, but rather the partition surface, also referred to as the partition plane, can for example be in various forms May be structured by ribs or conical regions. Similarly, the physical partition between both compartments is not necessarily realized continuously by a single material, such as a housing material. In particular, the function of the partition surface can be partially borne by the housing and partially by the plastic insert molding part of the stator group. In this case, for example, a through portion of the housing wall that divides the partial chamber of the housing is located in the central portion of the partition plane placed around the rotation axis of the electric motor. The penetration portion is closed by the plastic insert molding portion of the stator configuration group in a state where the assembly of the drive unit is completed. In this case, the plastic insert molding part of the stator component group is formed in a pot shape, and in this case, the described part forms the bottom part of the plastic insert molding part molded as a pot as a whole or a part of the bottom part. According to the advantage of the interrupting part of the normally metal housing at that point, the signal representing the angular position and / or rotation of the shaft of the electric motor is non-contacting and the first part of the housing that accommodates the drive component It can be transmitted from the chamber to a second partial chamber containing the attached electronic components. In this case, a device composed of one magnet or a plurality of magnets is located on the inner surface of the shaft of the electric motor, and thus on the end surface near the second partial chamber, and the device composed of the magnet or magnet is located in the second partial chamber. In cooperation with the attached sensor system in In this case, the sensor system is preferably located on a substrate that is perpendicular to the axis of the electric motor and thus parallel to the partition plane. In the radial direction of the electric motor, the substrate extends beyond the stator arrangement and supports at least one other sensor, for example part of another device for angle detection. With this alternative device for angle detection, in particular the state of the actuator mechanism actuated by the drive unit can be detected.

  The pot-shaped configuration of the plastic insert molding part closed toward the end face of the electric motor is to hold the second rolling bearing, that is, the rolling bearing not held by the bearing support, directly on the plastic insert molding part. It also has the advantage of being able to Therefore, the outer rings of both rolling bearings, in particular ball bearings, are surrounded by a plastic insert molding part in one case and introduced into the bearing support in the other case. The attached inner ring of the rolling bearing may be fitted over the shaft of the electric motor, for example, which constitutes a component of the rotor group. In a suitable configuration of the shaft, this relates in particular to geometrical accuracy and surface hardness, but the rolling elements of both rolling bearings may roll directly on the shaft of the electric motor.

  With regard to the continuous and reliable function of the drive unit, it is very important that the stator arrangement is introduced into the housing without play. The plastic insert molding part of the stator component group is preferably configured so that the fitting of the stator component group into the housing is not only performed with a minimum of play but also with a slight preload, In this case, centering ribs may be provided on the inner periphery of the housing and the outer periphery of the stator configuration group. The contour where the bearing support contacts the stator group preferably acts as an anti-rotation contour. The final fixing of the stator component group in the housing, and thus the entire stator, rotor, and component unit, is finally performed by screwing a bearing support to the housing. In a preferred configuration, the component with the plastic insert molded part, in particular in the form of an open half, is suitable for the plastic insert molded part being plastically deformed when screwing the bearing support. It is sandwiched so that the dimensions can be adjusted. In order to facilitate this deformation when the preload of the screw is relatively low, it is preferred if these points are configured as crushing ribs with a pressing surface appropriately reduced by segmentation.

  Thus, the stator configuration group is attached to the housing with vibration resistance. In this case, exactly two screwing points are provided in the preferred arrangement for mounting. These screwing points are located on opposite sides in the diametrical direction, or asymmetrically around the circumference of the bearing support. In the latter case, both screw points are preferably located in the peripheral part of the bearing support near the second housing opening of the drive unit. The second housing opening is located on the same end face of the housing as is introduced into the housing from the stator, rotor and component units. The aforementioned partition plane also partitions the second housing opening from the second partial chamber in which the electronic component is located. An integral or multi-part measuring shaft is provided to detect the state of the components of the actuator mechanism driven by the drive unit, which is driven from the same end face as the stator, rotor and component unit The magnet can be introduced into the housing of the unit and supports the magnet in the same manner as the shaft of the electric motor, and the magnet is scanned by a sensor system disposed in the second partial chamber.

The assembly of the drive unit involves the following steps:
1. Metal housing having a first partial chamber provided for receiving electrical drive components and a second partial chamber provided for receiving attached electronic components, in particular sensor system components A housing wall having a through-portion, which is arranged between the partial chambers, is oriented perpendicular to the central axis of the first partial chamber and the drive component (ie the housing wall) The surface normal of the part is arranged coaxially with respect to the central axis of the first partial chamber), step,
2. Providing a pre-assembled stator-rotor-constituting unit having a stator component group having a plastic insert molding part, a rotor component group, and a bearing support made of a thin metal plate coupled to the plastic insert molding part; Steps,
3. Mounting an electronic component in the second partial chamber; and
4). The pre-assembled stator / rotor / component unit is fitted to the housing by fitting the housing into the first partial chamber from the end surface of the housing away from the second partial chamber, and screwing the bearing support therewith, Electrically connecting with the electronic component, in which case the stator, rotor and component units are fitted, thereby providing a non-contact working connection between the drive component and the electronic component and closing the housing wall; ,
Have

  In this case, step 3 and step 4 can be performed in an arbitrary order. The bearing support is preferably a deep drawn part. For example, a self-tapping screw is suitable for fixing the stator group. The outer ring of one of the plurality of rolling bearings is press-fitted into the bearing support, preferably additionally by means of an inwardly directed flange of the bearing support in contact with the outer ring. Secured in the direction.

  In addition to the mechanical function, the bearing support also has good heat transfer characteristics. The heat generated in the rotor group and the stator group can be led to the housing of the drive unit, preferably from a light metal, for example an aluminum alloy, in particular via the bearing support. Further, the bearing support ensures that the stator group is continuously pressed against the back wall of the partial chamber containing the stator, rotor, and component unit, that is, the partition wall. Therefore, the wall of the housing that partitions the partial chambers constitutes another important element of heat extraction. Heat generated in the electronic component can also be derived through the same structural part of the housing. The entire housing is preferably screwed to the housing of the actuator mechanism, in which case the actuator mechanism is mounted, for example, on the transmission housing of an automobile transmission. However, the drive unit is also suitable for other applications, for example in brake actuator systems or clutch actuator systems.

  Hereinafter, two embodiments of the present invention will be described in detail with reference to the drawings.

A drive unit for a transmission actuator is shown in cross section. FIG. 2 is a cross-sectional perspective view of the drive unit shown in FIG. 1. 2 shows the stator, rotor and component units of the drive unit shown in FIG. 1 including a bearing support. FIG. 4 shows the stator-rotor-constituting unit shown in FIG. 3 without a bearing support. Fig. 4 shows a bearing support of the device shown in Fig. 3; 2 shows a housing of the device shown in FIG. The 2nd aspect of the drive unit for transmission actuators is shown with sectional drawing similar to FIG. The drive unit shown in FIG. 7 is shown in a cross-sectional perspective view. The drive unit shown in FIG. 7 is shown in an exploded view. The components of the drive unit shown in FIG. 7 are shown in a similar view to FIG. The components of the drive unit shown in FIG. 7 are shown in a similar view to FIG. The components of the drive unit shown in FIG. 7 are shown in a similar view to FIG. FIG. 8 is a cross-sectional perspective view of the stator / rotor / configuration unit of the apparatus shown in FIG. 7. FIG. 14 shows the apparatus shown in FIG. 13 in cross-section.

  Parts which correspond to each other or which are identical in principle are provided with the same reference numerals in any case. A drive unit with a reference numeral throughout is suitable for use in a one-motor transmission actuator. For the basic function, reference is made to the background art cited at the beginning. The following embodiments relate to both embodiments unless otherwise stated.

  The drive unit 1 has a housing 2 made of light metal, and an electric motor 3 is located in the housing 2. The shaft 5 indicated by reference numeral 4 of the electric motor 3 and the rotor 5 attached to the shaft 4 are part of the rotor configuration group indicated by reference numeral 6 of the electric motor 3. The stator configuration group indicated by reference numeral 7 of the electric motor 3 that constitutes an electrical drive component in the same manner as the rotor configuration group 6 has a winding 8 that can be energized, and the winding 8 is a plastic insert molding part. 9 is surrounded. Two rolling bearings 10, 11, that is, groove ball bearings, are provided to support the rotor configuration group 6 in the stator configuration group 7. The rotor configuration group 6, the stator configuration group 7, and the rolling bearings 10 and 11 are components of a stator / rotor / configuration unit indicated by reference numeral 12. The stator / rotor / constituent unit 12, that is, the entire electric and electromagnetic drive component, is fitted in the first cylindrical sub-chamber T 1 of the housing 2. The second partial chamber T2 should be distinguished from the first partial chamber T1, and the substrate 13 on which the sensors 14 and 15 are mounted is located in the second partial chamber T2. The motor phase of the stator group 7 is closely guided from the first partial chamber T1 to the substrate 13. The electronic components necessary for controlling the electric motor 3 are collected inside the second partial chamber T2, and are arranged on the substrate 13 in particular. The partition between the partial chamber T <b> 1 and the partial chamber T <b> 2 is particularly formed by the housing wall portion 16, and the housing wall portion 16 is an integral component of the housing 2. A seal 17 is inserted between the plastic insert molding portion 9 and the housing wall portion 16 of the stator group 7. The housing wall 16 which is not closed and not located in a single plane defines the approximate position of the partition plane between the partial chamber T1 and the partial chamber T2. Instead of the seal 17 configured as a solid seal, a liquid seal can also be used.

  The first rolling bearing 10 is arranged in the region of the end surface of the first partial chamber T1 and the entire housing 2 in the device shown in FIG. 7 as well as the device shown in FIG. The bearing 11 is located in the vicinity of the housing wall 16 disposed inside the housing. Each of the rolling bearings 10 and 11 has inner rings 18 and 19, and the inner rings 18 and 19 are held by the shaft 4. The main difference resides in the stator group 7 with respect to the attachment of the attached outer rings 20, 21. The outer ring 20 of the rolling bearing 10 on the end face side of the stator / rotor / constituent unit 12 is held by a bearing support 22, and the bearing support 22 is configured as a metal thin plate / deep drawing part or extrusion part. Yes. On the other hand, the outer ring 21 of the inner rolling bearing 11 is directly held by the plastic insert molding portion 9. The bottom portion 23 of the plastic insert molding portion 9 continues in the region of the plastic insert molding portion 9 that is molded into a cylindrical shape according to the outer peripheral surface of the outer ring 21. Thereby, the whole plastic insert molding part 9 is formed in a pot shape. In this case, the bottom part 23 is located in the penetration part of the housing wall part 16, and the partition between both the partial chambers T1 and T2 is supplemented by the stator configuration group 7. A magnet 24 is located on the end face of the shaft 4 near the bottom 23, and the magnet 24 is a part of the angle sensor system and cooperates with the sensor 14 on the substrate 13. The sensor 14 constitutes an electronic component for controlling the electric motor 3. This electronic component is an electronic commutation motor. Similarly, another similarly rotatable magnet, not shown, cooperates with a sensor 15 that is also disposed on the substrate 13.

  2, 3, and 5, together with the rolling bearing 10 and the shaft 4, covers the partial chamber T <b> 1 where the stator / rotor / component unit 12 is located on the end face side. With respect to the apparatus shown in FIGS. 1 to 6, in the region above the stator / rotor / component unit 12, the anti-rotation contour 25 is located in the stator component group 7 and the bearing support 22. 7 to 14, the pressure coupling portion between the stator configuration group 7 and the bearing support 22 is formed in an insert molding region on the outer diameter of the stator. In addition to being fixed against rotation, the bearing support 22 acts in both cases so that the entire stator, rotor and component unit 12 remains pressed in the direction of the housing wall 16.

  1 to 6 as well as the embodiment shown in FIGS. 7 to 14, two screwing points 26 and 27 for attaching the bearing support 22 to the housing 2 are provided. Yes. In the former case, the screwing points 26 and 27 are located below the partial chamber T1, that is, between the partial chamber T1 and the housing opening 28. The housing opening 28 extends from the end surface of the housing 2 to the housing wall 16 where the substrate 13 is disposed rearward. In the case of FIGS. 1 to 6, the ear-shaped halves 29 and 30 are located in a space-saving manner in the case of FIGS. The ear-shaped halves 29, 30 are seen especially in FIG. 4 and are an integral part of the plastic insert molding part 9. When assembling the drive unit 1, the ear-shaped halves 29, 30 are fitted inside the housing 2, in particular in the semicircular recesses 31, 32 seen in FIG. 6. When the screws 33, 37 are tightened at the screwing points 26, 27, the ear-shaped halves 29, 30 are compressed between the bearing support 22 and the housing 2, so that the plastic insert molding part 9 at the corresponding point is compressed. Plastic deformation is performed, and at that time, the predetermined thickness dimension of the ear-shaped halves 29 and 30 is adjusted accurately, and the entire stator configuration group 7 is fixed to the housing 2 with vibration resistance. In order to transmit the axial force, a dome portion 38 is formed in the bearing support 22 as shown individually in FIG. The second partial chamber T <b> 2 is closed by a cover 39 on the end surface side of the housing 2 opposite to the bearing support 22.

  7 to 14, the bearing support 22 is pressed against the plastic insert molding portion 9 of the stator component group 7, and in this case, the edge of the bearing support 22 is the plastic insert molding portion 9. It is in contact with the outer peripheral surface of. In the housing 2, a plurality of cooling ribs 40 are observed in FIGS. 7 to 9.

  As shown separately in FIG. 12, several portions of the bearing support 22, in particular a plurality of stationary tongues 34 directed radially outward, are used to support the stator group 7 in the axial direction. Used. The screwing points 26 and 27 are located on the opposite sides of the circumference of the bearing support 22 in the diametrical direction. Instead of the ear-shaped halves, the stator construction group 7 has circular openings 35, 36, which are connected to the stator-rotor construction unit 12 by means of the bearing support 22 and the two screws 33, 37. The crushing ribs 41, also referred to as straightening ribs, provide the possibility of screwing to the housing 2 and, in addition to the embodiment shown in FIGS. Offers the possibility of mechanical correction around the perimeter. The entire stator, rotor and component unit 12 is fitted and attached to the drive unit 1 from the same side of the housing 2 in both embodiments. From the same side, a measuring axis not shown can also be introduced into the housing opening 28 in order to cooperate with the sensor 15. Attached electronic components, here the sensors 14, 15 therein, are mounted from the opposite end face of the housing 2.

DESCRIPTION OF SYMBOLS 1 Drive unit 2 Housing 3 Electric motor 4 Axis 5 Rotor 6 Rotor composition group 7 Stator composition group 8 Winding which can be supplied 9 Plastic insert molding part 10 Rolling bearing 11 Rolling bearing 12 Stator, rotor, component unit 13 Substrate 14 Sensor 15 Sensor Reference Signs List 16 Housing Wall 17 Seal 18 Inner Ring 19 Inner Ring 20 Outer Ring 21 Outer Ring 22 Bearing Support Body 23 Bottom 24 Magnet 25 Anti-Rotation Contour Part 26 Screwing Location 27 Screwing Location 28 Housing Opening 29 Ear Shape Half 30 Ear Shape Half 31 Semicircular concave portion 32 Semicircular concave portion 33 Screw 34 Fixed tongue piece 35 Opening having crushing ribs on the circumference 36 Opening having crushing ribs on the circumference 37 Screws 38 Dome 39 Cover 40 Cooling ribs 41 Crushing ribs, correction ribs T1 No. 1 1 partial chamber T2 2nd partial chamber

Claims (10)

A drive unit,
An electric motor (3) disposed in the housing (2);
The electric motor (3) includes a stator configuration group (7) having a plastic insert molding portion (9), a rotor configuration group (6) supported by two rolling bearings (10, 11), and the rolling bearing. A bearing support (22) for holding one of the rolling bearings (10), the bearing support (22) connecting the plastic insert molding part (9) to the shaft of the electric motor (3). Drive unit supported in the direction and screwed to the housing (2).   The drive unit according to claim 1, wherein the bearing support (22) is configured as a thin metal plate / deep drawing part.   The drive unit according to claim 1 or 2, wherein the bearing support (22) is not rotatable relative to the plastic insert molding part (9) by shape coupling.   The said plastic insert molding part (9) is formed in the pot shape, The outer ring | wheel (21) of a 2nd rolling bearing (11) is hold | maintained at the said plastic insert molding part (9). 4. The drive unit according to any one of items 1 to 3.   A shaft (4) pivotally supported by the rolling bearings (10, 11) is an end face near the bottom (23) of the pot-shaped plastic insert molding portion (9), and a magnet (24) as a component of an angle sensor system. The drive unit according to claim 4, wherein the drive unit is supported.   The stator group (7) is a housing wall disposed between the first partial chamber (T1) and the second partial chamber (T2) of the housing (2) by the bearing support (22). 6. The electronic component (14, 15) that is pressed against the part (16) and that controls the electric motor (3) is located in the second partial chamber (T 2). The drive unit according to any one of the above.   Exactly two screwing points (26, 27) exist between the bearing support (22) and the housing (2), the screwing points (26, 27) being diametrically opposite each other. The drive unit according to any one of claims 1 to 6, wherein the drive unit is disposed on the side.   Exactly two screwing points (26, 27) exist between the bearing support (22) and the housing (2), and the screwing points (26, 27) are connected to the electric motor (3 The drive unit according to any one of claims 1 to 6, wherein the drive unit is disposed asymmetrically around the rotation axis.   At the screw locations (26, 27), the plastic insert molding part (9) of the stator group (7) is plastically deformed especially in the openings (35, 36) surrounded by the crushing ribs (41). The drive unit according to claim 7 or 8. A method of assembling an actuator (1), comprising:
A first partial chamber (T1) provided to accommodate the electrical drive component (12) and a second partial chamber provided to accommodate the attached electronic components (13, 14, 15) A metal housing (2) having (T2) is prepared, and a housing wall portion (16) having a penetrating portion disposed between the partial chambers (T1, T2) is provided in the first portion. A step oriented perpendicular to the central axis of the chamber (T1);
A stator configuration group (7) having a plastic insert molding portion (9), a rotor configuration group (6), and a bearing support body (22) made of a thin metal plate coupled to the plastic insert molding portion (9). Providing a pre-assembled stator-rotor-constituting unit (12) comprising:
Mounting the electronic components (13, 14, 15) in the second partial chamber (T2);
The pre-assembled stator-rotor-constituent unit (12) is fitted into the first partial chamber (T1) from the end surface of the housing (2) on the side away from the second partial chamber (T2). Therefore, the bearing support (22) is attached to the housing (2) by screwing and electrically coupled to the electronic components (13, 14, 15), and the stator / rotor / component unit (12). Providing a non-contact operative connection between the drive component (12) and the electronic component (14) and closing the housing wall (16) by fitting
A method of assembling the actuator (1).

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