Electric motor and switching unit for this

Abstract

Electric motor (2), comprising a switching unit (8) with a number of contact wires (24) arranged to form a connection ring (22) for coil ends of a stator winding and with an annular frame part (28), - wherein the frame part (28) has a number of insertion pockets (30), into each of which an insulation displacement contact (14) with an insulation displacement slot (52) between two insulation displacement legs (54) for clamping contact with at least one wire end (26) of the contact wires (24) can be or is inserted, and - wherein the insertion pockets (30) each have a pocket slot (38) on opposite pocket walls (36) which is aligned with the insulation displacement slot (52) of the insulation displacement contact (14) inserted into this insertion pocket (30), - wherein at least one of the two pocket walls (36) of the or each insertion pocket (30) has a first clamping contour (42) projecting into the pocket slot (38) for the or each wire end (26) received in the pocket slot (38), - wherein on one of the pocket walls (36) a dome-like raised extension (44) with a dome slot (46) is arranged on the outside, which is aligned with the pocket slot (38), - wherein the extension (44) has a second clamping contour (50) on its sides (48) flanking the dome slot (46), and - wherein the second clamping contour (50) is designed as a rib or as a pair of ribs which extends in the longitudinal direction (L) of the pocket slot (38).

Description

[0001] The invention relates to an electric motor comprising a switching unit with a number of contact wires arranged to form a connection ring for coil ends of a stator winding, as well as an annular frame part having a number of insertion pockets into each of which an insulation displacement contact can be inserted. Furthermore, the invention relates to such a switching unit and a brushless oil pump motor of a motor vehicle comprising such a switching unit.

[0002] A brushless electric motor has a stator with a number of stator teeth, arranged, for example, in a star shape, which support an electrical stator winding (motor winding) in the form of individual stator coils, which in turn are wound from an insulating wire. The coils are assigned to individual strands with their coil ends and are interconnected in a predetermined manner via connecting conductors of a switching unit. The connecting conductors are designed, for example, as contact wires arranged in a ring to form an interconnection ring.

[0003] In the case of a brushless electric motor as a three-phase AC machine, the stator has three strands and thus at least three connecting conductors, each of which is supplied with an electric current in a phase-shifted manner to generate a rotating magnetic field in which a rotor, usually equipped with permanent magnets, rotates. The connecting conductors are fed to the motor electronics to control the electric motor. The coils of the stator winding are interconnected in a specific manner using the connecting conductors. The type of interconnection is determined by the winding pattern of the stator winding, with a star connection or a delta connection of the coils being common.

[0004] DE 101 52 006 A1 discloses a stator with an annular stator yoke, on which stator coils with coil ends and a wiring arrangement with connecting conductors are arranged. Furthermore, receiving elements for connecting conductor connections are formed on the stator. These receiving elements each have a slot-shaped receiving means for the coil ends. The connecting conductor connections are designed as insulation displacement connectors and, in pairs, form an electrical insulation displacement connection with the coil ends on the associated receiving elements.

[0005] WO 2016 / 124636 A1 discloses an electric motor comprising a switching unit with a number of contact wires and an annular frame part. The contact wires are arranged to form an interconnection ring for the coil ends of a stator winding, and wire ends of the contact wires are connected to insulation displacement contacts. The insulation displacement contacts each have two insulation displacement legs spaced apart from one another to form an insulation displacement slot for connecting at least two of the wire ends. The frame part of the switching unit has a number of insertion pockets for receiving the insulation displacement contacts, corresponding to the number of insulation displacement contacts.

[0006] The contact wire to be connected to the insulation displacement contact is provided with an insulating sheath (insulation). When creating such an insulation displacement connection, the wire or its wire end is pressed into a slot in the insulation displacement contact so that the knife-like insulation displacement legs of the insulation displacement contact flanking the slot sever the insulation at the appropriate points and cut the wire around the circumference. It is possible that the wire, for example due to wire bending, is not centered in the slot during pressing in, so that when the insulation displacement contact is pressed in, one side of the wire is cut relatively little, or the wire is even stripped from just one side. Thus, only a comparatively small wire surface is used for contact.

[0007] When connecting more than one wire end to an insulation displacement contact, these wires can have different diameters, particularly due to their stretching. This favors a non-centered alignment of the wires when pressing in one after the other, which in turn allows a comparatively small wire surface to be used for contacting.

[0008] The plug-in pockets accommodating the insulation displacement contacts each have a pocket slot on their opposite pocket walls for receiving the wire. DE 10 2013 114 688 A1 discloses that a holding element for the corresponding wire end is arranged on one of the two pocket walls. Furthermore, it is disclosed there that a centering prism is formed in an end region of the support surface of the pocket slot for aligning the wire.

[0009] An electrical connector for a motor stator is known from DE 20 2010 016 199 U1. This comprises a connection component having a first connection portion and a second connection portion connected to the first connection portion, wherein the first connection portion comprises a pair of adjacent clamping arms, each of the clamping arms comprising: an arm part having a first end connected to the first end of the arm part of the other of the clamping arms and a second end opposite the first end and located farther from the second connection portion than the first end; and an elastic piercing part having a connecting end connected to the second end of the arm part and a free end extending obliquely toward and spaced from the first end of the arm part of the other of the clamping arms.

[0010] DE 10 2008 054 529 A1 discloses an electric motor. It comprises a stator in a motor housing and a rotor shaft mounted in the stator. A bearing plate is arranged on each of the opposite end faces of the motor housing, and each bearing plate accommodates a bearing part for the rotor shaft. The bearing plates are directly connected to the motor housing. Insulation displacement terminals are arranged on a contact ring arranged axially on the stator.

[0011] WO 2017 / 009 052 A1 discloses a stator for an electrical machine with three phase windings. The stator comprises a stator body and a connection ring with three electrical connections, which is attached to the front of the stator body. An end section of a phase winding is connected to a connection, wherein the connection has a connection pocket into which a connection contact designed as an insulation displacement contact is inserted.

[0012] US 2004 / 0006 865 A1 discloses a method for connecting the phases of an electrical machine with a segmented stator. An end cap assembly is attached to the stator core. The winding wire is wound around the end cap assembly and the stator core to form a stator segment assembly. Several stator segment assemblies are assembled to form a stator with first, second, and third phases. A phase wire stitching machine connects the opposite ends of the winding wire of each stator segment assembly to form the first, second, and third phases of the stator. The phase wires can be attached to the stator segment assemblies via clamps, insulation displacement contacts, hook clamps, and / or directly to the winding wire.

[0013] From DE 103 24 664 A1 a roller motor is known, wherein a winding wire is guided through shaped contours for pre-fixing, wherein the winding wires are connected by pressing in insulation displacement terminals.

[0014] The invention is based on the object of providing an electric motor in which a particularly reliable connection and contacting of its contact wires is established. Furthermore, a corresponding switching unit for an electric motor and a brushless oil pump motor, in particular of a motor vehicle, with such a switching unit are to be provided.

[0015] With regard to the electric motor, the object is achieved according to the invention with the features of claim 1, with regard to the switching unit with the features of claim 7, and with regard to the oil pump motor with the features of claim 8. Advantageous embodiments and further developments are the subject of the subclaims. The statements made in connection with the electric motor also apply mutatis mutandis to the switching unit, and vice versa.

[0016] For this purpose, the electric motor comprises a switching unit with a number of contact wires arranged to form a connection ring for coil ends of a stator winding and with an annular frame part. The frame part has a number of insertion pockets, into each of which an insulation displacement contact with an insulation displacement slot between two insulation displacement legs for clamping contact with at least one wire end of the contact wires can be inserted or is inserted. In other words, the or each insulation displacement contact has the two spaced-apart insulation displacement legs to form the insulation displacement slot, with the insulation displacement slot being open on the free end side of the insulation displacement legs. Furthermore, the insertion pockets each have a pocket slot on opposite pocket walls, which is aligned with the insulation displacement slot of the insulation displacement contact inserted into this insertion pocket.The insulation displacement slot and the pocket slot are preferably axial, i.e., parallel to a motor axis. The pocket walls comprise a clamping receptacle, in which the insulation displacement contact is or is received during assembly. The number of plug-in pockets or insulation displacement contacts particularly preferably corresponds to the number of phase connections of the electric motor.

[0017] According to the invention, at least one of the two pocket walls of the or each insertion pocket further comprises a first clamping contour projecting into the pocket slot for the or each wire end received in the pocket slot.

[0018] The insulation displacement legs have at least one knife-like section on opposite sides, so that a wire end inserted into the insulation displacement slot from the slot opening is cut and / or incised, thereby severing its wire insulation. The particularly flexible insulation displacement legs exert a spring-like clamping force on the respective wire end(s). In the insulation displacement state of the wire or wire end, the knife edges of the insulation displacement legs run virtually tangentially to the usually approximately circular wire diameter.

[0019] Preferably, during assembly, the wire end or ends (wires) to be contacted are already inserted into the pocket slots when the insulation displacement contact is inserted into the associated insertion pocket. Particularly advantageously, the clamping contour aligns and secures the or each wire end received in the pocket slot in such a way that the inserted wire ends are oriented substantially perpendicular to a plane defined by the pocket slot, and bending of the wire end in the insertion pocket is avoided or at least reduced. Preferably, both pocket walls have the first clamping contour, so that such alignment of the or each wire end is improved and its bending is further reduced.In this way, a comparatively uniform and reliable contact of the wire on both its flanks is realized by means of the two insulation displacement legs of the corresponding insulation displacement contact.

[0020] The (clamping) force fixing the wire end or ends should not be so great that it hinders the pressing in of the insulation displacement contact during assembly and / or that the wire end or ends are not bent when inserted into the insertion pocket, particularly during winding. The wire end or ends are clamped in the first clamping contour in particular due to at least slight deformability of an insulation surrounding the wire and of the wire end itself. The clamping force is determined or determinable in particular by the shape of the first clamping contour and its insertion depth into the pocket slot, as well as depending on the wire diameter and the thickness of the insulation of the wire end.

[0021] According to an advantageous development, the first clamping contour of the or each pocket wall is arranged on its two clamping sides, which flank the pocket slot. Clamping sides are understood to be those sides of a pocket wall which border the pocket slot, in particular along the longitudinal direction of the slot, and thus also border the wire end(s) inserted into the slot. In this way, the or each wire end received in the slot is aligned centrally with respect to the pocket slot. Consequently, the wire end(s) are also arranged centrally with respect to the insulation displacement slot formed by the insulation displacement legs. Thus, the wire end(s) are advantageously stripped and cut comparatively evenly, which in turn increases the reliability of the contact.

[0022] Furthermore, on the outside of one of the pocket walls, a dome-like, raised extension with a dome slot is arranged, which is aligned with the pocket slot. The outside is the side of the pocket wall opposite the clamping receptacle. The sides flanking the dome slot have a second clamping contour, which, for example, has a shape analogous to the first clamping contour. The or each wire end is thus additionally aligned and fixed by means of the sides of the extension flanking the dome slot. In this way, bending of the or each wire end within the clamping pocket is further reduced.

[0023] The second clamping contour and, according to a suitable embodiment, the first clamping contour are each formed as a rib or a pair of ribs extending in the longitudinal direction of the pocket slot. In an alternative embodiment, which is not further encompassed by the scope of the claims, the clamping contour has a diamond or honeycomb shape extending over the entire side or sides flanking the corresponding slot.

[0024] Particularly expediently, at least two wire ends are accommodated in one of the pocket slots and connected to the corresponding insulation displacement contact. In this way, two or more contact wires are contacted, i.e., electrically connected, via the corresponding insulation displacement contact, so that all associated contact wires can be or are connected to a phase connection of the electric motor using just one of the insulation displacement contacts.

[0025] For this purpose, the insulation displacement slot of the or each insulation displacement contact has, in the longitudinal direction of the slot, a first slot region adjoining a slot opening on the leg-free end and an adjoining widened second slot region. For example, the second slot region is widened in a diamond- or rhombus-shaped manner.

[0026] During assembly, a first wire end is pressed into the insulation displacement contact and cut during contacting. This reduces the wire diameter of the wire end in the area of the insulation displacement edges. The widened second area of the insulation displacement slot has the advantageous purpose of accommodating the wire end initially cut in the insulation displacement slot as soon as a second wire end reaches the preferably comparatively short or narrow first (cutting) area adjacent to the slot opening between its insulation displacement legs designed as knife edges. Since in this position the first wire end is located in the widened area of the insulation displacement slot, the required insulation displacement forces of the two insulation displacement legs act on the second wire end in the cutting area upstream of the slot opening. The same applies to further wire ends inserted into the insulation displacement slot.The or each wire end is oriented perpendicular to the slot plane of the insulation displacement contact. Furthermore, the wire diameter of those wire ends that were inserted into the insulation displacement slot after the first wire end is successively cut or reduced by a smaller amount. In other words, the wire area used for contacting decreases successively.

[0027] According to an advantageous development, the or each insulation displacement leg of the respective insulation displacement contact has at least one raised joining contour on the outside of the leg, i.e., on the side facing away from the insulation displacement slot. This joining contour preferably interacts with the two pocket walls of the corresponding insertion pocket, which are not slotted. The joining contour advantageously enables a force-fitting and / or form-fitting fit of the insulation displacement contact within the insertion pocket, depending on its shape. For example, grooves, ribs, hooks, and / or pins are formed on the insulation displacement leg for this purpose, for example, introduced by stamping, which preferably enable the force-fitting and / or form-fitting connection with corresponding counterparts arranged on the associated pocket wall.

[0028] The switching unit comprises a number of contact wires for connecting coils of a stator winding to phase connections. These phase connections are each formed by or comprise an insulation displacement contact, which can be inserted or is inserted into a respective slot in a frame part. For example, three insulation displacement contacts are provided for contacting the phase connections and are arranged equidistant from one another.

[0029] To contact the corresponding wire end(s) of the contact wires with the associated insulation displacement contact, the wire end(s) is / are received in the pocket slots of the opposing pocket walls of the insertion pocket. The wire end(s) is / are secured by a first clamping contour of one of the two pocket walls or by two first clamping contours of both pocket walls, particularly to ensure comparatively reliable contact.

[0030] The brushless oil pump motor of a motor vehicle comprises an electric motor in one of the variants described above. Thus, the oil pump motor comprises, in particular, a switching unit with a frame part, which in turn comprises a number of plug-in pockets for receiving insulation displacement contacts, each with a pocket slot on opposite pocket walls. At least one of the two pocket walls of the or each plug-in pocket has a first clamping contour protruding into the pocket slot.

[0031] Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. In the drawings: Fig. 1 shows a perspective view of an electric motor with a stator, on which a switching unit is mounted, and with a rotor as well as with electronics which are connected to a connection ring by means of insulation displacement contacts, Fig. 2 shows a perspective view of the switching unit with an annular frame part and with the interconnection ring, which has a plurality of circularly arranged contact wires, and two wire ends of the interconnection ring are connected to the insulation displacement contacts inserted into the slots of the frame part, Fig. 3a in a plan view a pocket according to the prior art, wherein two of its opposite pocket walls each have a pocket slot into which a wire end is received off-center with respect to the pocket slot, Fig. 3b in a plan view of the pocket designed according to the invention, the pocket walls of which have the pocket slots each have a first clamping contour projecting into the corresponding pocket slot, as well as a dome-like extension arranged on the outside of one of the pocket walls, the dome slot of which is aligned with the corresponding pocket slot, Fig. 3c in a top view the pocket according to Fig. 3b with the wire end accommodated in it, Fig. 3d in a front view the pocket according to Fig. 3b with two wire ends accommodated therein, which are contacted with one of the insulation displacement contacts, and Fig. 4 shows a perspective view of an insulation displacement contact with an insulation displacement slot flanked by two insulation displacement legs, which has an extended slot area.

[0032] Corresponding parts are provided with the same reference numerals in all figures.

[0033] Fig. Figure 1 shows an electric motor 2, preferably a brushless oil pump motor for a motor vehicle. The electric motor 2 has a rotor 4 and a motor shaft 6, as well as a stator 10 provided with a switching unit 8. Furthermore, the electric motor 2 has a printed circuit board (electronics) 12, which is contacted by three shear-clamp contacts 14 via their contact heads 16. In the assembled state, the contact heads 16 are inserted into crimp-tab-like plug-in receptacles 18 of contacts (flat contacts) or contact sections 20, which are manufactured, for example, as stamped and bent parts from flat wire. Fig. For the purpose of improved visibility, the contact heads 16 are shown in an exploded view, removed from the corresponding plug receptacles 18. The insulation displacement contacts 14 form the phase connections for the three-phase current supply to the stator or motor winding.

[0034] Fig. Figure 2 shows the switching unit 8 with a connection ring 22. This has several contact wires 24 arranged in a circle. Two wire ends 26 of the contact wires 24 are each connected to one of the three equidistantly arranged insulation displacement contacts 14.

[0035] Furthermore, the switching unit 8 has an annular frame part 28, which is made of plastic, for example. This, in turn, has a pocket 30 in the area of the respective insulation displacement contact 14 for receiving the insulation displacement contact 14.

[0036] Furthermore, in Fig. 2 shows the switching unit 8 with complete, closed coil cassettes 32, which are molded onto the frame part 28 of the switching unit 8. These cassettes accommodate the stator teeth of the electric motor 2 in the assembled state and are wound with the individual coils of the stator winding in a manner not further shown.

[0037] The Fig. 3a shows a prior art insertion pocket 30. This has a clamping receptacle 34, into which the corresponding insulation displacement contact 14 is or is received. The clamping receptacle 34 is surrounded by pocket walls 36 on its periphery, with a pocket slot 38 arranged on each of two opposite pocket walls 36, in which the wire end 26 is received. The two pocket slots 38 are aligned with one another. The received wire end 26 has a bend and is not centered with respect to the pocket slot 38.

[0038] Fig. Figure 3b shows the inventive pocket 30 with its clamping receptacle 34, which is enclosed by pocket walls 36. Two opposing pocket walls 36 each have a pocket slot 38. The clamping sides 40 of the corresponding pocket walls 36 flanking the pocket slots 38 each have a first clamping contour 42.

[0039] Furthermore, on one of the pocket walls 36, which has one of the pocket slots 38, a dome-like raised extension 44 is arranged on the outside, which according to this embodiment is formed onto this pocket wall 36. This extension 44 in turn has a dome slot 46 aligned with the pocket slots 38, wherein the sides 48 flanking the dome slot 46 each have a second clamping contour 50. The first clamping contour 42 and the second clamping contour 50 are designed as ribs which extend along a longitudinal direction L ( Fig. 3d) of the pocket slot 38 or the dome slot 48. In the Fig. 3b and Fig. 3c the longitudinal direction L runs into the plane of the drawing.

[0040] Fig. 3c shows the pocket 30 of the Fig. 3b, wherein one of the wire ends 26 of the contact wires 24 is accommodated therein. In comparison to Fig. 3a shows that the wire end 26 is centrally aligned and fixed, in particular clamped (pinched), with respect to the two aligned pocket slots 38 by means of the first clamping contour 42 and additionally by means of the second clamping contour 50. As a result, the bending of the wire end 26 is also avoided or at least comparatively significantly reduced.

[0041] According to the Fig. 3d, two wire ends 26 are received in the plug-in pocket 30 and contacted with the corresponding insulation displacement contact 14. An insulation displacement slot 52, which is formed between two insulation displacement legs 54 of the insulation displacement contact 14, is aligned ( Fig. 4), in the assembled state of the insulation displacement contact 14 in this plug-in pocket 30 with its pocket slots 38 and the dome slot 46. Advantageously, due to the central fixation of the two wire ends 26 in the pocket slots 38 when pressing in the associated insulation displacement contact 14 during its assembly, the wire end 26 is cut evenly by the knife-like insulation displacement legs 52 and in this way a particularly reliable contacting of the wire end 26 with the insulation displacement contact 14 is achieved.

[0042] According to a further variant of the insertion pocket according to the invention, not shown in detail, no extension 44 is arranged thereon. The wire ends 26 are then fixed solely by means of the first clamping contours 42.

[0043] In Fig.4 shows one of the insulation displacement contacts 14 with an insulation displacement slot 52, which is flanked by two insulation displacement legs 54 of the insulation displacement contact 14, i.e., is located or formed between these two insulation displacement legs 54. The insulation displacement contact 14 is preferably a stamped part. The insulation displacement legs 54 of the insulation displacement contact 14 merge into the contact head 16, which is preferably provided with a through-hole 56. Joining contours 58 (grooves, pins) are formed or stamped onto the outside of the insulation displacement legs 54.

[0044] The insulation displacement slot 52 has a slot opening 60 in the region of the leg-free ends of the insulation displacement legs 54. Adjoining this opening in the slot longitudinal direction S is a first, comparatively short slot region 62. This slot region merges into an expanded second slot region 64 in the slot longitudinal direction S. This second slot region is preferably diamond-shaped. Adjoining this region 64, in turn, is a third, comparatively long insulation displacement region, or at least a clamping region 66. This clamping region ends at the ends opposite the leg-free ends, i.e., at the transition region 68 of the insulation displacement legs 54.

[0045] This contact geometry enables reliable contacting or connection not just of one wire end, but of two or more wire ends. These are successively inserted or pressed into the insulation displacement slot 52 in the longitudinal direction S of the slot and are cut circumferentially (azimuthally). The cutting depth is greater than or equal to the thickness of the insulation (insulating sheath) of the or each wire end. For this purpose, the mutually facing edges of the insulation displacement legs 54 in the area of the insulation displacement slot 52 are designed as knife-like knife edges 68.

[0046] The invention is not limited to the exemplary embodiments described above. Rather, other variants of the invention can also be derived therefrom by those skilled in the art without departing from the subject matter of the invention. In particular, all individual features described in connection with the exemplary embodiments can also be combined with one another in other ways without departing from the subject matter of the invention. List of reference symbols 2 electric motor 4 Rotor 6 Motor axle 8 Switching unit 10 Stator 12 circuit board 14 insulation displacement contact 16 Contact head of an insulation displacement contact 18 plug-in socket 20 Contact section 22 interconnection ring 24 contact wire 26 Wire end 28 frame part 30 slip pockets 32 spool cassette 34 clamp mount 36 pocket wall 38 pocket slot 40 terminal side 42 first clamping contour 44 dome-like process 46 Cathedral slot 48 side flanking the cathedral slot 50 second clamping contour 52 insulation displacement slot 54 insulation displacement legs 56 passage opening 58 Joining contour 60 slot opening 62 first slot area 64 second slot area 66 insulation displacement area 68 knife edge L Longitudinal direction of the pocket slot S slot longitudinal direction

Claims

[1] Electric motor (2), comprising a switching unit (8) with a number of contact wires (24) arranged to form a connection ring (22) for coil ends of a stator winding and with an annular frame part (28), - wherein the frame part (28) has a number of insertion pockets (30), into each of which an insulation displacement contact (14) with an insulation displacement slot (52) between two insulation displacement legs (54) for clamping contact with at least one wire end (26) of the contact wires (24) can be inserted or is inserted, and - wherein the insertion pockets (30) each have a pocket slot (38) on opposite pocket walls (36) which is aligned with the insulation displacement slot (52) of the insulation displacement contact (14) inserted into this insertion pocket (30), - wherein at least one of the two pocket walls (36) of the or each insertion pocket (30) has a first clamping contour (42) projecting into the pocket slot (38) for the or each wire end (26) received in the pocket slot (38), - wherein on one of the pocket walls (36) a dome-like raised extension (44) with a dome slot (46) is arranged on the outside, which is aligned with the pocket slot (38), - wherein the extension (44) has a second clamping contour (50) on its sides (48) flanking the dome slot (46), and - wherein the second clamping contour (50) is designed as a rib or as a pair of ribs which extends in the longitudinal direction (L) of the pocket slot (38). [2] Electric motor (2) according to claim 1, characterized by that the first clamping contour (42) of the or each pocket wall (36) is arranged on its two clamping sides (40) which flank the pocket slot (38). [3] Electric motor (2) according to claim 1 or 2, characterized by that the first clamping contour (42) is designed as a rib or as a pair of ribs which extends in the longitudinal direction (L) of the pocket slot (38). [4] Electric motor (2) according to one of claims 1 to 3, characterized by that at least two wire ends (26) are received in one of the pocket slots (38) and connected to the corresponding insulation displacement contact (14). [5] Electric motor (2) according to one of claims 1 to 4, characterized by that the insulation displacement slot (52) of the or each insulation displacement contact (14) has, in the slot longitudinal direction (S), a first slot region (62) adjoining a leg-free end slot opening (60) and an adjoining widened second slot region (64). [6] Electric motor (2) according to one of claims 1 to 5, characterized bythat the or each insulation displacement leg (54) of the respective insulation displacement contact (14) has at least one raised joining contour (58) on the outside of the leg. [7] Switching unit (8) for an electric motor (2), with a number of contact wires (24) for connecting coils of a stator winding and with phase connections which are formed by or comprise a corresponding number of insulation displacement contacts (14), - wherein the insulation displacement contacts (14) are insertable or inserted into a respective insertion pocket (30) of a frame part (28) for contacting at least one wire end (26) of the contact wires (24), and - wherein the wire ends (26) of the contact wires (24) are received in pocket slots (38) arranged on opposite pocket walls (36) of the corresponding insertion pocket (30) and are fixed by means of a first clamping contour (42) of one of the pocket walls (36) or by means of a first clamping contour (42) of each of the pocket walls (36), - wherein on one of the pocket walls (36) a dome-like raised extension (44) with a dome slot (46) is arranged on the outside, which is aligned with the pocket slot (38), - wherein the extension (44) has a second clamping contour (50) on its sides (48) flanking the dome slot (46), and - wherein the second clamping contour (50) is designed as a rib or as a pair of ribs which extends in the longitudinal direction (L) of the pocket slot (38). [8] Brushless oil pump motor of a motor vehicle, comprising a switching unit (8) according to claim 7.

Images