Wiper motor for a motor vehicle

Abstract

The invention relates to a wiper motor (10; 10a) for a motor vehicle, with a housing (12) for receiving an electronically commutated electric motor (22), which has a stator (24) which interacts with a rotor (26) mounted rotatably about a longitudinal axis (28), wherein the stator (24) has stator wires (55 to 57) forming electrical phases (A, B, C), which are contacted by means of a connecting element (44) with connection wires (38) for supplying current to the stator wires (55 to 57), wherein the stator (24) can be positioned in different rotationally angular positions with respect to the longitudinal axis (28) in a motor housing (16), wherein the connecting element (44) has contact elements (46 to 48) with first contacts (51) and second contacts (52).

Description

Wiper motor for a motor vehicleTechnical area

[0001] The invention relates to a wiper motor for a motor vehicle which, in connection with the installation of the wiper motor in the region of a right or a left side of the vehicle, is distinguished by a particularly advantageous design using one and the same stator assembly.Prior art

[0002] Wiper motors for a motor vehicle using electronically commutated electric motors are known from the prior art. Such a wiper motor has a housing which receives the electric motor and can be contacted by way of a connection plug in order to supply current to or activate the individual stator windings of the electric motor. In addition, it is customary or known to arrange such a wiper motor, which is used for moving wiper blades by way of a wiper linkage, either in the region of the right front of the vehicle, or the left front of the vehicle near the windscreen. An important point here is that differently designed housings and arrangements of the connection plugs are required. In other words, depending on whether the wiper motor is arranged on the right or left side of the vehicle, different housing parts are used. These different configurations of the housings or connection plugs differ in a mirrored arrangement of the connection plugs or the respective housing. This in turn has the consequence that stator assemblies with their stator wires must also be connected by way of differently designed connecting elements to the housing elements that carry the connection plug.Disclosure of the invention

[0003] The wiper motor for a motor vehicle according to the invention with the features of Claim 1 has the advantage that it can be used both in the case of a wiper motor installed on the right side of the vehicle and in the case of such a wiper motor intended for the left side of the vehicle using one and the same components for a stator for the contacting between the stator wires and the connection wires which lead into a connection plug.

[0004] The invention is based on the idea by a configuration of the connecting element in which, in conjunction with a rotated arrangement of the stator in a motor housing, it can be contacted from different sides with the connection wires from the housing cover. In other words, this means that a stator assembly, consisting in each case of an identical motor housing, an identical stator body and an identical connecting element, which are connected to one another, can be used either in the case of a wiper motor intended for the right side of the vehicle and / or in the case of a wiper motor intended for the left side of the vehicle.

[0005] Against the background of the above explanations, a wiper motor for a motor vehicle according to the invention with the features of Claim 1 therefore has a housing for receiving an electronically commutated electric motor. The electric motor has a stator which interacts with a rotor mounted rotatably about a longitudinal axis. The stator has stator wires forming electrical phases which are contacted by means of a connecting element with connection wires for supplying current to the stator wires. The stator can be positioned in different rotationally angular positions with respect to the longitudinal axis of a rotor or the stator body in a motor housing, wherein the connecting element has first contacts and second contacts, wherein either the first contacts or the second contacts are contacted with the connection wires, and wherein the first and second contacts are arranged on opposite sides of the connecting element.

[0006] Advantageous developments of the wiper motor for a motor vehicle according to the invention are specified in the subclaims.

[0007] It is particularly preferred if the contacts are arranged mirror-symmetrically to a longitudinal plane of the connecting element. This has the consequence that the connection wires can be connected to the first and second contacts in each case at the same location with respect to the connecting element.

[0008] A particularly compact arrangement of the contacts, in which they can be contacted simultaneously with all three connection wires, provides that the first and second contacts are arranged in each case in line with one another when viewed in the direction of the longitudinal plane.

[0009] A particularly simple or advantageous assembly without additional material-bonding connections provides that the contacts with the connection wires form clamping connections.

[0010] In a structural design configuration of the last proposal, it is provided that the first and the second contacts have in each case two oppositely arranged spring elements, between which the connection wires designed in the form of leadframe elements for forming the clamping connections are arranged.

[0011] Another advantageous structural design configuration of the wiper motor, which allows a connection between the stator wires and the connecting element that is particularly simple, safe and advantageous from technical aspects of production, provides that the stator has a stator body with a positioning element which is designed to expose and position the stator wires for the connection with the contact elements.

[0012] It is particularly advantageous here if the positioning element is a component part of an insulating element consisting of plastic and formed by injection moulding, which is arranged on an end face of the stator body having stamped plates.

[0013] The connection between the contact elements and the stator wires on the side of the stator wires preferably takes place by contact hooks, which are connected to the stator wires by a friction-locking and / or material-bonding connection. This preferably involves so-called heat staking of the contact hooks with the stator wires, in which the contact hooks are pressed against the stator wire and heated to form the electrical connection.

[0014] Another preferred structural design configuration for fastening the connecting element on the stator body provides that the positioning element with the connecting element are positioned in relation to one another and connected by way of a connection having pins and opposing openings and interacting with the pins. The connection may for example preferably take place by heat staking.

[0015] In principle, it is provided that the connection wires are arranged on a housing cover and end on the side facing away from the connecting element in the region of a connection plug. As already mentioned, the connection wires are typically designed in the form of leadframe elements and are surrounded or overmoulded in some regions by the plastic of the housing cover.

[0016] The mounting of the housing cover with the connection wires preferably takes place by providing that the housing cover can be connected to the housing in a joining direction, that, on the side facing the connecting element, the connection wires project from the housing cover in line with the joining direction, and that the first or second contacts are aligned in line with the connection wires.

[0017] A preferred structural design configuration of the wiper motor further provides that the housing has a transmission housing and a motor housing which are connected to one another, and that the connecting element partially projects into the transmission housing.

[0018] Further advantages, features and details of the invention result from the following description of preferred embodiments of the invention and on the basis of the drawings.Brief description of the drawings

[0019] shows an exploded representation of a wiper motor for a motor vehicle,

[0020] shows in plan view two wiper motors for installation on a right and a left side of the vehicle,

[0021] shows a section in the plane III–III of,

[0022] shows a motor housing with stators arranged therein in the case of the electric motors according to,

[0023] shows the stators of the electric motors according toin a side view,

[0024] shows a stator body in a perspective view,

[0025] shows the stator body according towith a connecting element in a perspective representation,

[0026] shows the component parts of a connecting element in an exploded representation and

[0027] shows a section through a stator assembly for explaining the connection between the connecting element and the stator body.Embodiments of the invention

[0028] Identical elements or elements having an identical function are denoted by the same reference numerals in the figures.

[0029] In, a wiper motor 10 for a motor vehicle is shown in a perspective representation. The wiper motor 10 is used for operating wiper blades on a windscreen of the vehicle by means of a wiper linkage which is not shown and is connected to the wiper blades.

[0030] The wiper motor 10 has a multi-part housing 12, which comprises a housing base part in the form of a transmission housing 14 and a motor housing 16 which can be flange-mounted on the transmission housing 14. The transmission housing 14 receives a one- or multi-stage transmission 18, and can be closed by means of a housing cover 20, which delimits the interior of the transmission housing 14.

[0031] The motor housing 16 is used for receiving an electronically commutated electric motor 22, which has a stator 24 arranged fixed in place in the motor housing 16. The electric motor 22, which is of an internal rotor type of design, acts in a known manner with a rotor 26, which is arranged within the stator 24 and is arranged rotatably about a longitudinal axis 28 in the motor housing 16. The rotor 26 is connected to a drive shaft 30, which interacts by a toothing region 32 with a transmission wheel 34, which is arranged rotatably in the transmission housing 14. The transmission wheel 34 is in turn coupled in a known manner with an output shaft not shown for driving the mentioned wiper linkage or wiper blade. While the stator 24 and the rotor 26 are located within the motor housing 16, the drive shaft 30 projects into an opening of the transmission housing 14.

[0032]

[0033] For activating the electric motor 22 or the current supply to the stator 24, the housing cover 20 has a connection plug 36 formed in one piece on it, which can be contacted with a wiring-harness mating plug of the motor vehicle. Leading into the connection plug 36 are connection wires 38, which can only be seen in Figs. 1 and 3, in the form of leadframe elements 39, which have in each case a rectangular cross section and are surrounded or overmoulded in some regions by the plastic of the housing cover 20. On the side opposite the connection plug 36, the three connection wires 38 project from the housing cover 20, to be specific parallel to a joining direction 40, which can be seen in, of the housing cover 20 with the transmission housing 14.

[0034]

[0035] In addition, it is mentioned that the connection between the housing cover 20 and the transmission housing 14 takes place by way of example by way of a number of latching tongues 41, which are arranged on the housing cover 20 and interact with latching projections 42 on the transmission housing 14 to form a (releasable) latching connection.

[0036]

[0037] The connection wires 38 are contacted on the side facing the electric motor 22 with a connecting element 44, which is connected to the stator 24 and projects into the transmission housing 14.

[0038]

[0039] In Figs. 2 and 3, in addition to the wiper motor 10, a wiper motor 10a is shown. While the wiper motor 10 is designed to be fastened on a right side of the motor vehicle in the direction of travel, the wiper motor 10a is designed to be mounted or arranged on a left side of the vehicle. In particular, it can be seen that the transmission housing 14 and the housing cover 20 with the connection plug 36 of the wiper motor 10 are designed mirror-symmetrically to the transmission housing 14a and the housing cover 20a of the wiper motor 10a. Init can be seen that the connection wires 38 of both housing covers 20, 20a are in each case contacted with or connected to the connecting element 44, which is explained in more detail below.

[0040] In Figs. 4 and 5, in each case the motor housing 16 of the wiper motor 10, 10a as well as the stator 24 and the connecting element 44 are shown. In particular, it can be seen that, in a comparison between the two motor housings 16 of the wiper motors 10, 10a, the motor housing 16 of the wiper motor 10a is arranged for example clockwise by 90° with respect to the motor housing 16 of the wiper motor 10. On the basis of the arrangement of the connecting element 44, it can also be seen that, in comparison with the wiper motor 10, the stator 24 of the wiper motor 10a has been additionally turned clockwise by a further 90°. In other words, this means that the stator 24 is arranged within the motor housing 16 in two rotationally angular positions extending by 90° with respect to the longitudinal axis 28. This is made possible by an interlocking geometry between the stator 24 and the motor housing 16, which allows a correspondingly different arrangement and positioning of the stator 24 in the motor housing 16.

[0041] With reference to Figs. 5 and 8, it can be seen that the connecting element 44 has for the activation of the electric motor 22 three contact elements 46 to 48, which consist of sheet metal as stamped / bent components. Each of the contact elements 46 to 48 forms a first contact 51 and a second contact 52 on opposite sides 78, 79 of the connecting element 44 for contacting the connection wires 38 by way of a clamping connection. The three first and second contacts 51, 52 in each case on each side of the connecting element 44 are arranged in line one above the other parallel to the longitudinal axis 28 when viewed in the direction of the longitudinal axis 28. Furthermore, the contacts 51, 52 are in each case at the same distance a from the longitudinal axis 28 and are arranged mirror-symmetrically to a longitudinal plane 86 of the connecting element 44.

[0042] In, the stator 24 can be seen on its own. The stator 24 has a stator body 50 with a plurality of stator plates 53, which are stacked one on top of the other and connected to one another when viewed in the direction of the longitudinal axis 28. On the side facing the longitudinal axis 28, the stator plates 53 form at uniform angular distances around the longitudinal axis 28 teeth 54 around which in each case a stator wire 55 to 57 is wound in a known manner in order to form an electrical phase A, B and C. As is known per se, the stator wires 55 to 57 may also be connected to one another or interconnected in either a star or delta connection. On the (lower) end face of the stator 24, a first electrical insulating element 58, consisting of plastic, is moulded on, and on the upper side of the stator 24 a second electrical insulating element 59. In order to be able to connect the stator wires 55 to 57 to the respective contact element 46 to 48 on the connecting element 44, the upper or second electrical insulating element 59 is at the same time formed as a positioning element 60. For this purpose, it has for the three stator wires 55 to 57, or the electrical phases A, B and C, fork-shaped extensions 62 projecting upwards from the stator 24, wherein in each of the extensions 62 the corresponding stator wire 55 to 57 is fixed by clamping and in some regions exposed. Furthermore, between the extensions 62 there can be seen two pin-shaped elevations 63, 64, the end portions of which interact with openings 65, 66, which can be seen in, of the connecting element 44. The elevations 63, 64 and openings 65, 66 are used for the connection between the connecting element 44 and the stator 24, wherein the connection takes place for example by way of heat staking.

[0043] Inthere can be seen on the side facing away from the contacts 51, 52 three contact hooks 68 to 70 of the contact elements 46 to 48, which are designed to form in each case an electrical connection with the region of the stator wire 55 to 57, or the phases A, B and C, which is exposed in the region of the extensions 62. When joining the connecting element 44 with the stator 24 in a joining direction 72 parallel to the direction of the longitudinal axis 28, the contact hooks 68 to 70 end up in the region of the stator wires 55 to 57. For forming the electrical connection, the contact hooks 68 to 70 are compressed in accordance with the representation ofby heat staking to contact the respective stator wire 55 to 57. Any remaining insulation there may still be on the stator wire 55 to 57 is melted or destroyed.

[0044] In accordance with the representation of Figs. 7 and 8, the connecting element 44 consists of a connection part 73, which can be connected to the stator 24, and a receiving body 74 for the contact elements 46 to 48. In this case, the contact elements 46 to 48 are first pre-assembled in the (prefabricated) receiving body 74. Subsequently, this assembly is placed into an injection mould and overmoulded with plastic, whereby the connection part 73 is also formed. The three differently shaped contact elements 46 to 48 are thus received within cutouts 76 of the receiving body 74 and in the connection part 73.

[0045] Each of the contact elements 46 to 48 has in each case on the opposite sides 78, 79 of the base body 74 spring elements 81, 82 arranged in the base body 74 as well as two spring elements 83, 84, which form the first and second contacts 51, 52. The spring elements 81 to 84 are arranged elastically deformably in relation to one another, wherein the spring elements 81 and 82 are arranged opposite one another and preferably touch one another, in the same way as the two spring elements 83 and 84. An important point here is that the connection wires 38 can be contacted both by way of the first contacts 51 and by way of the second contacts 52, to be specific depending on from which side 78, 79 of the connecting element 44 the connection wires 38 project in the direction of the connecting element 44. This direction in turn depends on whether the stator 24 is used in a wiper motor 10 or a wiper motor 10a.

[0046] The spring elements 81 to 84 are connected in one piece to the respective contact hooks 68 to 70 by way of individually shaped intermediate portions 85.

[0047] Depending on whether a wiper motor 10 or a wiper motor 10a is to be produced, the stator 24 is positioned in the motor housing 16 in its corresponding rotationally angular position. Previously, the connecting elements 44 were already connected to the stator 24 and the contact hooks 68 to 70 were already electrically contacted with the stator wires 55 to 57. The motor housing 16 is then connected to the transmission housing 14, 14a. By providing that the spring elements 81 to 84 are arranged on opposite sides of the longitudinal plane 86 of the connecting element 44, the housing cover 20, 20a can be joined in the same arrangement of the connection wires 38 to the connecting element 44. Depending on the design of the wiper motor 10, 10a, the connection wires 38 either come into contact or end up between the spring elements 81, 82, or come into contact with the spring elements 83, 84.

[0048] The wiper motor 10, 10a described so far can be altered or modified in a wide variety of ways without departing from the concept of the invention.List of reference signs

[0049] 10, 10a Wiper motor

[0050] 12 Housing

[0051] 14, 14a Transmission housing

[0052] 16 Motor housing

[0053] 18 Transmission

[0054] 20, 20a Housing cover

[0055] 22 Electric motor

[0056] 24 Stator

[0057] 26 Rotor

[0058] 28 Longitudinal axis

[0059] 30 Drive shaft

[0060] 32 Toothing region

[0061] 34 Transmission wheel

[0062] 36 Connection plug

[0063] 38 Connection wire

[0064] 39 Leadframe element

[0065] 40 Joining direction

[0066] 41 Latching tongue

[0067] 42 Latching projection

[0068] 44 Connecting element

[0069] 46 - 48 Contact element

[0070] 50 Stator body

[0071] 51 First contact

[0072] 52 Second contact

[0073] 53 Stator plate

[0074] 54 Tooth

[0075] 55 - 57 Stator wire

[0076] 58 Insulating element

[0077] 59 Insulating element

[0078] 60 Positioning element

[0079] 62 Extension

[0080] 63 Elevation

[0081] 64 Elevation

[0082] 65 Opening

[0083] 66 Opening

[0084] 68 - 70 Contact hook

[0085] 72 Joining direction

[0086] 73 Connection part

[0087] 74 Receiving body

[0088] 76 Cutout

[0089] 78 Side

[0090] 79 Side

[0091] 81 - 84 Spring element

[0092] 85 Intermediate portion

[0093] 86 Longitudinal plane

[0094] a Distance

[0095] A, B, C Phase

Claims

1.Wiper motor (10; 10a) for a motor vehicle, with a housing (12) for receiving an electronically commutated electric motor (22), which has a stator (24) which interacts with a rotor (26) mounted rotatably about a longitudinal axis (28), wherein the stator (24) has stator wires (55 to 57) forming electrical phases (A, B, C), which are contacted by means of a connecting element (44) with connection wires (38) for supplying current to the stator wires (55 to 57), wherein the stator (24) can be positioned in different rotationally angular positions with respect to the longitudinal axis (28) in a motor housing (16), wherein the connecting element (44) has contact elements (46 to 48) with first contacts (51) and second contacts (52), wherein either the first contacts (51) or the second contacts (52) are contacted with the connection wires (38), and wherein the first contacts (51) and second contacts (52) are arranged on opposite sides (78, 79) of the connecting element (44).2.Wiper motor according to Claim 1, characterized in that the contacts (51, 52) are arranged mirror-symmetrically to a longitudinal plane (86) of the connecting element (44).3.Wiper motor according to Claim 1 or 2, characterized in that the first contacts (51) and the second contacts (52) are arranged in each case in line with one another when viewed in the direction of the longitudinal plane (86).4.Wiper motor according to one of Claims 1 to 3, characterized in that the contacts (51, 52) form clamping connections with the connection wires (38).5.Wiper motor according to Claim 4, characterized in that first contacts (51) and the second contacts (52) have in each case two oppositely arranged spring elements (81 to 84), between which the connection wires (38) designed in the form of leadframe elements (39) for forming the clamping connections are arranged.6.Wiper motor according to one of Claims 1 to 5, characterized in that the stator (24) has a stator body (50) with a positioning element (60), which is designed to expose and position the stator wires (55 to 57) for the connection with the contact elements (46 to 48).7.Wiper motor according to Claim 6, characterized in that the positioning element (60) is a component part of an insulating element (59) consisting of plastic and formed by injection moulding, which is arranged on an end face of the stator body (50) having stator plates (53).8.Wiper motor according to Claim 6 or 7, characterized in that the contact elements (46 to 48) for contacting the stator wires (55 to 57) have contact hooks (68 to 70), which are connected to stator wires (55 to 57) by a friction-locking and / or material-bonding connection.9.Wiper motor according to one of Claims 6 to 8, characterized in that the positioning element (60) with the connecting element (44) are positioned in relation to one another and connected by way of a connection having pins (63, 64) and opposing openings (65, 66) and interacting with the pins (63, 64).10.Wiper motor according to one of Claims 1 to 9, characterized in that the connection wires (38) are arranged on a housing cover (20; 20a) and end on the side facing away from the connecting element (44) in the region of a connection plug (36).11.Wiper motor according to Claim 10, characterized in that the housing cover (20; 20a) can be connected to the housing (12) in a joining direction (40), in that, on the side facing the connecting element (44), the connection wires (38) project from the housing cover (20; 20a) in line with the joining direction (40), and in that the first and second contacts (51, 52) are aligned in line with the connection wires (38).12.Wiper motor according to one of Claims 1 to 11, characterized in that the housing (12) has a transmission housing (14; 14a) and the motor housing (16), which are connected to one another, and in that the connecting element (44) partially projects into the transmission housing (14; 14a).

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