Electric steering system and vehicle with same

Abstract

An electric power steering system (1) comprises: a sensor unit (2) having at least one sensor (13) for detecting steering information of a steering shaft (10); an electric drive unit (3) for generating an electric assist force, the drive unit (3) having an electric servomotor (15) and a control device (16), the control device (16) being designed to control the servomotor (15) on the basis of the detected steering information; and a steering transmission (4) having a transmission housing (5) with a first transmission input (6) for connecting the drive shaft (9) to the drive unit (3), a second transmission input (7) for connecting the steering shaft (10) to the sensor unit (2), and a transmission output (8) for connecting the output shaft (11) to at least one steerable wheel, the drive unit (3) is connected to the transmission housing (5) at a first transmission input (6) and the sensor unit (2) is connected to the transmission housing (5) at a second transmission input (7), the sensor unit (2) and the drive unit (3) being electrically and / or signalling connected to each other via a wiring frame (17) arranged in the transmission housing (5).

Description

Technical Field

[0001] The present invention relates to an electric steering system having the features of the preamble of claim 1. Furthermore, the present invention relates to a vehicle having such a steering system. Background Art

[0002] Today's electric power steering devices (EPS) incorporate various electrical components such as torque and angle sensors, electric servo motors, controllers, etc. for data exchange and power supply. These components are usually interconnected by externally laid wiring harnesses, which must meet high requirements in terms of robustness.

[0003] Document DE 10 2004 006 835 A1 discloses a steering system for a vehicle, in particular an electric power steering device for a motor vehicle, having a steering spindle which, at one of its ends, connects a steering handle to a rotary slide or rotary piston of a steering valve by means of a first torsional element. The steering system has a hydraulic servo motor for actuating an output member of the steering transmission, wherein the pressure medium in the working chamber of the hydraulic servo motor flows in under the control of the steering valve. Furthermore, the steering system has an electric servo motor for actuating the output member, wherein the electric servo motor and the steering spindle act on a common rotary member between the first torsional element and the rotary slide or rotary piston. The electric servo motor is controlled by a control and / or regulating device of the steering system or the vehicle according to the signals of a rotary angle sensor which detects the rotary angle and / or the actuating torque at the steering handle. Summary of the Invention

[0004] The object of the present invention is to create a steering transmission of the above type, which is characterized by a robust design and a simple electrical wiring of the electrical components.

[0005] According to the present invention, this object is achieved by a steering system having the features of claim 1 and a vehicle having the features of claim 15. Advantageous design options are derived from the dependent claims, the drawings and / or the description.

[0006] The subject matter of the present invention is an electric steering system which is designed specifically for and / or suitable for a vehicle. Preferably, the electric steering system is used to implement a steering command generated by a steering handle in a mechanical and / or electrical, in particular electromechanical, manner to at least one steerable wheel.

[0007] The steering system has a sensor unit having one or more sensors configured to and / or adapted to detect steering information on the steering shaft. In particular, the steering information includes the steering angle and / or the steering torque and / or the steering speed and / or the steering acceleration. The sensor can be configured, for example, as a position sensor, in particular a rotational angle sensor, and / or a torque sensor.

[0008] The steering system has an electric drive unit that includes an electric servo motor for generating an electric assistive force and a control device for controlling the servo motor based on the detected steering information. In particular, the sensor unit is configured to transmit the detected steering information to the control device, where the control device is configured to process the position information in terms of data technology and / or forward the position information to a higher-level controller. The control device or a possible controller can have an evaluation module, for example a microprocessor, which is configured to evaluate the steering information and / or take the steering information into account when determining the wheel steering angle set at the wheel. Specifically, the evaluation module is configured to determine the actual edge steering angle of the wheel based on the steering information and / or take the steering information into account when determining the target wheel steering angle.

[0009] The steering system also has a steering gear, which is in particular configured to and / or adapted to transmit the steering movement to one or more wheels of the vehicle. The steering gear has a gear housing that has a first gear input for connecting a drive shaft to the drive unit, a second gear input for connecting a steering shaft to the sensor unit, and a gear output for connecting an output shaft to at least one or exactly one steerable wheel. Here, the drive unit is connected to the gear housing at the first gear input, and the sensor unit is connected to the gear housing at the second gear input. The drive shaft, the steering shaft, and the output shaft can preferably be connected to each other in terms of gearing technology by a superimposed gear. Preferably, the drive shaft and the steering shaft are connected to each other in terms of gearing technology by a variable-speed gear and the steering shaft and the output shaft are connected to each other in terms of gearing technology by a worm gear. In principle, the steering movement can only be achieved or transmitted to the steering shaft by the electric servo motor (steer-by-wire). Optionally, the steering shaft can be connected to a steering spindle or a steering column in order to transmit the operating torque applied by a steering handle, in particular a steering wheel, to the steering shaft. Thus, the electric servo motor can be used for steering force assistance.

[0010] The drive shaft may have a first input interface arranged at the first transmission input end, to which a servo motor is and / or can be connected in drive technology for transmitting the torque or rotational movement generated by the electric servo motor. The steering shaft may have a second input interface arranged at the second transmission input end, at which a sensor unit is arranged and / or can be arranged for detecting steering information. Optionally, a steering handle is and / or can be connected in drive technology to the second input interface, preferably for transmitting manual torque. The output shaft may have an output interface arranged at the transmission output end, which is connected to at least one wheel by a known kinematic connection so that the wheel steering angle at the wheel changes when the output shaft rotates. Preferably, the first input interface and / or the second input interface and / or the output interface are formed as a journal projecting axially from the transmission housing on the end side.

[0011] Within the framework of the present invention, it is proposed that the sensor unit and the drive unit are interconnected electrically and / or in signal technology by a wiring frame (also called the so-called "lead frame") arranged in the transmission housing. In particular, the wiring frame extends between the first transmission input end and the second transmission input end within the transmission housing, such that the wiring frame is protected or shielded from the environment by the transmission housing. Preferably, the wiring frame is fixedly mounted in the transmission housing and / or integrated into the transmission housing.

[0012] The present invention is based on the recognition that laying a cable harness externally (i.e., outside the transmission housing) only provides weak protection against mechanical and electrical influences. In addition, there are other disadvantages, such as a lack of protection against incorrect operation, packaging limitations, a large number of external plug connectors, high costs for sealing methods, and higher assembly costs during the production process. These disadvantages can be eliminated or reduced by a wiring frame laid in the transmission housing. Therefore, a steering system is proposed, which is characterized by a robust design and simple electrical wiring of the electrical components.

[0013] In a specific design, it is stipulated that the wiring frame is rigid or substantially rigid. Here, "substantially rigid" means that the wiring frame does not have flexible materials or has an increased stiffness compared to common cables. In particular, the wiring frame is formable or plastically deformable to adapt the wiring frame to the corresponding surrounding geometry. Therefore, a wiring frame is proposed, which is characterized by a robust structure and simple installation in the transmission housing.

[0014] In another specific design, it is stipulated that the wiring frame has a plurality of independent conductors that are electrically insulated from each other. These independent conductors respectively form electrical contacts at their free ends for at least indirectly connecting the drive unit and / or the sensor unit. In particular, the independent conductors are configured as rigid, preferably metallic conductors, such as wire or strip. Preferably, the independent conductors are arranged side by side in a flat manner and / or are evenly spaced apart from each other. Particularly preferably, at least a part of the independent conductors is configured for and / or suitable for power transmission, and / or at least a part of the independent conductors is configured for and / or suitable for signal transmission. Thus, a wiring frame is proposed, which is characterized by a simple and cost-effective structure.

[0015] The wiring frame has an electrically insulating potting body. In particular, except for the free ends, the independent conductors are completely embedded in the potting body. Preferably, the independent conductors are mechanically connected to each other through the potting body. The potting body can be formed by a rigid or flexible potting material (such as plastic or resin material). Particularly preferably, the independent conductors are embedded in the potting material by an injection molding process, especially by overmolding, for manufacturing the potting body. Thus, a wiring frame is proposed, which is characterized by simple manufacturing and high mechanical protection for the independent conductors.

[0016] In another specific embodiment, it is stipulated that the wiring frame forms or jointly forms a first wiring interface for electrically connecting the drive unit on one side of the first transmission input end and forms or jointly forms a second wiring interface for electrically connecting the sensor unit on one side of the second transmission input end. In particular, the electrical contacts can be electrically contacted through the first wiring interface or the second wiring interface. In principle, the electrical contacts at the first wiring interface and / or the second wiring interface can be electrically connected to the drive unit or the sensor unit by a connection method of mechanical and / or material connection. However, preferably, the first wiring interface and / or the second wiring interface is configured for and / or suitable for forming an electrical plug connection. Particularly preferably, when the drive unit and the sensor unit are installed on the transmission housing, they can be automatically connected to the wiring frame through the corresponding wiring interfaces, preferably through the electrical plug connections. Preferably, the drive unit and / or the sensor unit can be installed on the transmission housing along exactly one orientation, and the plug connections are also manufactured along this orientation and / or can be manufactured along this orientation. Thus, an electrical connection of the drive unit and the sensor unit is proposed, which is characterized by particularly simple and reliable installation and manual operation.

[0017] In an improved embodiment, it is provided that the first connection interface and / or the second connection interface is configured as a socket integrated into the transmission housing, or alternatively as a plug integrated into the transmission housing, for forming an electrical plug connection. Preferably, the electrical contacts are in electrical contact with the connectors of the plug or socket. Particularly preferably, the drive unit and / or the sensor unit can be configured as modules, wherein the correspondingly associated connection interfaces form modular connections or standard interfaces for different design variants of the drive unit or the sensor unit. In particular, the different drive units and / or sensor units each have mating interfaces complementary to the first connection interface or the second connection interface. Thus, a steering system is proposed, which is characterized by a small number of plug connections and at the same time enables a modular structure.

[0018] In another design embodiment, it is provided that the control device has a circuit board, wherein the circuit board is directly connected to the first connection interface via a circuit board connector or via at least one or exactly one electrical intermediate component. For example, the circuit board can be arranged or aligned in the drive unit in such a way that it is directly connected to and / or connectable to the first connection interface via the circuit board connector. Alternatively, the circuit board connector of the circuit board is electrically connected to the first connection interface via an electrical intermediate component. Particularly preferably, the first connection interface forms a transfer point between the connection frame and the intermediate component. For this purpose, the electrical intermediate component has a mating interface complementary to the first connection interface. In addition, the intermediate component has another mating interface, which is configured to be complementary to the circuit board connector of the circuit board. The electrical intermediate component can optionally be laid completely or at least partially within the connection unit. Thus, a drive unit is proposed, which is characterized by a simple and flexible connection to the steering transmission.

[0019] In another possible design embodiment, it is provided that the electrical intermediate component is configured as another connection frame, which connects the circuit board to the first connection interface. In particular, the drive unit has a drive housing, wherein the electric servo motor and the control device are accommodated in the drive housing. The other connection frame can be integrated into the drive housing and / or at least partially mounted within the drive housing. Preferably, the other connection frame is configured in the same way as the connection frame. This means that the other connection frame has a plurality of independent conductors, which are preferably embedded in another potting body. Thus, a drive unit is proposed, which is characterized by the control device having a robust electrical connection.

[0020] In an alternative embodiment, the electrical intermediate part is configured as a wiring cable that is guided in a protected manner within the drive housing or in a separate protective tube inside or outside the drive housing, and this wiring cable connects the circuit board to the first wiring interface. For example, the wiring cable is configured as an adapter cable, which is configured to form and / or is suitable for forming a plug connection with the first wiring interface and / or another plug connection with the circuit board connector. Thus, a steering system is proposed, which is characterized in that the drive unit has a simple and flexible electrical connection.

[0021] In another specific solution, it is provided that at least one sensor is connected to the second wiring interface by a protected connection cable. Preferably, the sensor unit has a sensor housing, wherein the connection cable is guided in a protected manner within the sensor housing to at least one sensor. Preferably, the connection cable is laid freely or in another protective tube within the sensor housing. In principle, the connection cable can be formed as a sensor cable that is already integrated into the sensor and is connected and / or connectable to the second wiring interface through a plug connection. Alternatively, the sensor cable is connected and / or connectable to the sensor through another plug connection. Thus, a steering system is proposed, which is characterized in that the connection of the sensor unit to the transmission housing or the wiring frame is simple and cost-effective.

[0022] In an improved solution, it is provided that the transmission housing has a guiding profile complementary to the wiring frame, wherein the wiring frame and the guiding profile cooperate in a form-fitting and / or force-transmitting connection manner. In particular, the guiding profile is used to hold the wiring frame in a position-fixed and / or loss-preventing manner within the housing. Particularly preferably, the wiring frame is at least partially inserted into the guiding profile, such that the wiring frame is fixed to the transmission housing. The guiding profile can be formed, for example, by one or more protrusions or recesses directly molded on the transmission housing, and these recesses form at least a part of the negative profile of the wiring frame. Particularly preferably, the wiring frame can be connected to the guiding profile only in a single orientation, thereby ensuring particularly high installation reliability. Specifically, the transmission housing can be configured as a cast housing, wherein the guiding profile is manufactured by one-time molding, preferably by a casting process. Thus, a steering transmission is proposed, which is characterized by a particularly cost-effective structure, wherein at the same time, the simple installation of the wiring frame within the transmission housing is achieved.

[0023] In another specific embodiment, it is stipulated that the guiding profile is formed by at least one or exactly one guiding groove, and the wiring frame is at least partially inserted into the guiding groove. In particular, the wiring frame is held in the guiding groove in a force-transmitting connection manner, for example, by press-fitting. Particularly preferably, the wiring frame extends in the transmission housing in a direction that is at least partially parallel and / or oriented the same as the rotational axis of the steering shaft and / or the drive shaft, wherein the transmission housing has at least one guiding groove extending in the axial direction with respect to the rotational axis and / or at least one or exactly one guiding groove extending in the radial direction with respect to the rotational axis for accommodating the wiring frame. Thus, a particularly simple and cost-effective installation of the wiring frame in the transmission housing is proposed.

[0024] In an alternative or optionally supplementary improvement, it is stipulated that the transmission housing has at least one or exactly one fastening receptacle, and the wiring frame has at least one or exactly one fastening section, wherein the fastening section is received in the fastening receptacle in a form-fitting connection and / or a force-transmitting connection manner. In the installed state, the fastening section engages in the fastening receptacle in such a way that the wiring frame is fixed in the transmission housing and / or is fixed against loss. Preferably, the fastening receptacle can be configured as a recess, hole, or groove introduced into the transmission housing, into which the fastening section is inserted and / or can be inserted. For example, at least one fastening section can be configured as a tenon, pin, locking lug, or spring hook, which can engage with the associated fastening receptacle in a form-fitting connection and / or a force-transmitting connection manner. Particularly preferably, the fastening section is integrally connected to the potting body, preferably made of a common material section, or is formed on the potting body. Particularly preferably, the wiring frame having the fastening section can be inserted into the fastening receptacle by an insertion movement. Thus, a wiring frame is proposed, which is characterized by being simply installable into the transmission housing. The combination of the guiding profile and the fastening section can also ensure a particularly reliable installation.

[0025] In another design, it is stipulated that the wiring frame is formed on the inner profile of the transmission housing such that the wiring frame is received in the transmission housing without clearance and / or without spacing. In particular, the transmission housing has a plurality of steps and / or protrusions, wherein the wiring frame is adapted to the inner profile of the transmission housing by forming. Specifically, the wiring frame between the wiring interfaces can mostly or completely, preferably in a planar manner, abut against the transmission housing. Thus, a steering transmission is proposed, which is characterized by a particularly space-saving arrangement of the wiring frame in the transmission housing.

[0026] In another alternative design, it is provided that the electric steering system is configured as an electric power steering system (EPS). During the steering process, the steering angle is specified via the steering handle as a measured value of the desired wheel steering angle of at least one steerable wheel, wherein the electric servo motor provides an additional torque for steering assistance. In particular, the electric servo motor is connected to the steering shaft for torque transmission for this purpose.

[0027] Another subject matter of the present invention relates to a vehicle having an electric steering system as described above or according to any one of claims 1 to 14. The vehicle can be a passenger car (Pkw), agricultural or construction machinery or a commercial vehicle (Nfz). Description of the Drawings

[0028] Other features, advantages and effects of the present invention result from the following description of the preferred embodiments of the present invention. Among them:

[0029] Figure 1 A schematic diagram of a steering system for a vehicle is shown;

[0030] Figure 2 Shows for Figure 1 A schematic diagram of the wiring frame of the steering system of

[0031] Figure 3 Shows for Figure 1 A schematic diagram of the drive unit of the steering system of

[0032] Figure 4 Is shown in the same illustration as Figure 3 An alternative embodiment of the drive unit;

[0033] Figure 5 Shows for Figure 1 A schematic diagram of the steering gear of the steering system of Detailed Description of the Invention

[0034] As an embodiment of the present invention, Figure 1 A schematic diagram of an electric steering system 1 for a vehicle is shown. The electric steering system 1 is configured as an electric servo steering system, also known in English as "electric powered steering system (EPS)".

[0035] The steering system 1 has a sensor unit 2, an electric drive unit 3 and a steering gear 4. The steering gear 4 has a gear housing 5, which has a first gear input 6 and a second gear input 7 and a gear output 8. The electric drive unit 3 is arranged at the first gear input 6 of the gear housing 5, and the sensor unit 2 is arranged at the second gear input 7 of the gear housing 5.

[0036] The steering transmission device 4 has a drive shaft 9, a steering shaft 10, and an output shaft 11, which are connected to each other in terms of transmission technology. The drive shaft 9 and the steering shaft 10 are oriented in the same direction as each other, and the output shaft 11 and the steering shaft 10 are oriented transversely to each other. In other words, the drive shaft 9 defines a first axis of rotation and the steering shaft 10 defines a second axis of rotation, wherein the first axis of rotation and the second axis of rotation extend axially parallel to each other. The output shaft 11 defines a third axis of rotation, wherein the first or second axis of rotation intersects the third axis of rotation in a top view, in particular at a right angle. For example, the drive shaft 9 is connected to the steering shaft 10 in terms of transmission technology by a single-stage or multi-stage speed-changing transmission device, such as a cylindrical gear transmission device, and the output shaft 11 is connected to the steering shaft 10 in terms of transmission technology by a worm gear transmission device.

[0037] The sensor unit 2 has a sensor housing 12 and at least one sensor 13 arranged inside the sensor housing 12, which is configured to detect steering information of the steering shaft 10, such as steering torque and / or steering angle. For example, the sensor 13 can be configured as a combined steering torque and steering angle sensor (TAS). For this purpose, the steering shaft 10 is led out of the transmission housing 5 via the second transmission input end 7 and guided through the sensor housing 12. For example, the end side of the steering shaft 10 on the side of the sensor unit 2 can be connected to a steering handle (not shown) by a steering column, wherein a steering movement can be applied to the steering shaft 10 by the steering handle.

[0038] The drive unit 3 has a drive housing 14, an electric servo motor 15 arranged in the drive housing 14, and a control device 16 arranged in the drive housing 14. The electric servo motor 15 is configured to apply an additional torque to the steering shaft 10 according to the steering information. For this purpose, the control device 16 is configured to control and / or regulate the electric servo motor 15 based on the steering information. Here, the drive shaft 9 is led out of the transmission housing 5 via the first transmission input end 6 and is connected to the electric servo motor 15 in terms of drive technology.

[0039] The steering transmission device 4 is used to set the wheel steering angle of the vehicle according to the rotation of the steering shaft 10. For this purpose, the output shaft 11 of the steering transmission device 4 is connected to the steerable wheels in a known manner by a steering linkage (not shown) so that the rotational movement of the output shaft 11 is converted into a linear movement of the steering tie rod of the steering linkage and the corresponding wheel steering angle is set on the corresponding wheels.

[0040] Furthermore, the steering system 1 has a wiring frame 17 through which at least one sensor 13 and a control device 16 for transmitting electrical energy and / or signals are conductively connected to each other. The wiring frame 17 is essentially rigid and is fixedly mounted within the transmission housing 5. The wiring frame 17 is electrically connected to the control device 16 via a first wiring interface 18 at the first transmission input 6 and is electrically connected to the sensor 2 via a second wiring interface 19 at the second transmission input 7. Thus, a steering system 1 is proposed which is designed such that there are no externally laid cables or cable bundles between the sensor unit 2 and the drive unit 3, as Figure 1 shown.

[0041] as Figure 2 shown, the wiring frame 17 has a plurality of conductive individual conductors 20 which are jointly embedded in an electrically insulating potting body 21. For example, the individual conductors 20 are arranged lying flat side by side with respect to each other and / or are arranged at uniform intervals from each other. The potting body 21 can be produced by plastic injection molding, for example by overmolding.

[0042] In order to form the first wiring interface 18 and the second wiring interface 19, the ends of the individual conductors 20 are exposed such that they respectively form electrical contacts 22. The steering system 1 is modularly constructed, wherein, for modular reasons, the first wiring interface 18 and the second wiring interface 19 form standardized transfer points for the sensor unit 2 or the drive unit 3. For this purpose, the first wiring interface 18 and the second wiring interface 19 can for example be formed by sockets integrated into the transmission housing 5 to form a plug-in connection 23, wherein the electrical contacts 22 accordingly form the connectors of the sockets. Thus, the drive unit 3 and the sensor unit 2 respectively have a first mating interface 24 or a second mating interface 25 which is complementary to the first wiring interface 18 or the second wiring interface 19, and the first mating interface or the second mating interface is for example correspondingly constructed as a plug to form a plug-in connection 23.

[0043] as Figure 1 shown, the transmission housing 5 has a guiding profile 26 through which the wiring frame 17 is non-lostingly received within the transmission housing 5. The guiding profile 26 is formed by a plurality of guiding grooves 27 constructed on the transmission housing 5 into which the wiring frame 17 is inserted in sections. For example, the wiring frame 17 can be received or held in the guiding grooves 27 in a force-transmitting connection and / or a form-fitting connection.

[0044] In addition, a plurality of fastening sections 28 may be arranged on the potting body 21, and these fastening sections engage with corresponding fastening receiving parts (not shown) arranged in the transmission housing 5 so as to additionally fix the wiring frame 17. For example, the fastening section 28 is configured as a tenon formed on the potting body 21, and the fastening receiving part is configured as a hole introduced into the transmission housing 4, and the tenon is received or held in the hole in a form-fitting connection and / or force-transmitting connection manner.

[0045] The wiring frame 17 is designed to be deformable, wherein the wiring frame 17 adapts or can adapt to the inner contour of the transmission housing 5 by forming. Therefore, the wiring frame 17 can be laid in the transmission housing 5 in a particularly space-saving manner and can be adapted to different housing designs in a simple manner.

[0046] As Figure 1 shown, the control device 16 has a circuit board 29, and the circuit board is connected to the first wiring interface 18 through an electrical intermediate member 30. For this purpose, on the one hand, the intermediate member 30 has a first mating interface 24, and on the other hand, it is electrically connected to the circuit board connector 31 of the circuit board 29 through another mating interface 32.

[0047] Figure 3 and Figure 4 respectively show two different wiring schemes of the circuit board connector 31 of the drive unit 3 and the first wiring interface 24 of the steering transmission 4. The circuit board connector 31 may be formed by a plug connector joint, for example, and the intermediate member 30 can be connected through the plug connector joint.

[0048] As Figure 3 schematically shown, the electrical intermediate member 30 is configured as another wiring frame 33, which uses available plug connector joints to connect to the control device 16. The other wiring frame 33 can be constructed in the same structure as the wiring frame 17 described in Figure 2 , wherein the other wiring frame 33 is formed by a plurality of independent conductors embedded in the potting body, and these independent conductors form or jointly form the first mating interface 24 and another mating interface 32 at the end sides. Here, the other wiring frame 33 can be laid segmentally in the drive housing 14 or integrated into the drive housing 14.

[0049] As Figure 4 schematically shown, in an alternative variant embodiment, the electrical intermediate member 30 is configured as a wiring cable 34, which is used to connect to the circuit board connector 31. The wiring cable 34 is configured as a flexible adapter cable, for example, and it has the first mating interface 24 and another mating interface 32 at the end sides. Here, the wiring cable 34 can be laid in a protected manner in the drive housing 14 and / or in a protective tube (not shown) arranged in or on the drive housing 14.

[0050] Figure 5 Shows the second transmission input end 7 of the transmission housing 5, wherein the second wiring interface 19 is configured as a socket integrated in the transmission housing 5. The sensor 13 is connected to the second wiring interface 19 through a connection cable (also known as "pigtail cable adapter" in English) laid in the sensor housing 12. The connection cable has a second mating interface 25 at the end side, and the second mating interface is configured as a plug complementary to the socket to form a plug-in connection portion 23. The connection cable can be directly connected to the sensor 13, especially non-removably, or can be detachably connected to the sensor 13 through another plug-in connection portion.

[0051] List of reference numerals:

[0052] 1 Steering system

[0053] 2 Sensor unit

[0054] 3 Drive unit

[0055] 4 Steering transmission

[0056] 5 Transmission housing

[0057] 6 First transmission input end

[0058] 7 Second transmission input end

[0059] 8 Transmission output end

[0060] 9 Drive shaft

[0061] 10 Steering shaft

[0062] 11 Output shaft

[0063] 12 Sensor housing

[0064] 13 Sensor

[0065] 14 Drive housing

[0066] 15 Servo motor

[0067] 16 Control device

[0068] 17 Wiring frame

[0069] 18 First wiring interface

[0070] 19 Second wiring interface

[0071] 20 Independent conductor

[0072] 21 Potting body

[0073] 22 Electrical contact

[0074] 23 Plug-in connection part

[0075] 24 First mating interface

[0076] 25 Second mating interface

[0077] 26 Guide profile

[0078] 27 Guide groove

[0079] 28 Fastening section

[0080] 29 Circuit board

[0081] 30 Electrical intermediate component

[0082] 31 Circuit board connector

[0083] 32 Another mating interface

[0084] 33 Another wiring frame

[0085] 34 Wiring cable.

Claims

1. An electric steering system (1), the steering system comprising: A sensor unit (2), wherein the sensor unit (2) has at least one sensor (13) for detecting steering information of a steering shaft (10); An electric drive unit (3), the drive unit being configured to generate an electric assist force, wherein the drive unit (3) has an electric servo motor (15) and a control device (16), wherein the control device (16) is configured to control the servo motor (15) based on the detected steering information; and A steering transmission (4), wherein the steering transmission (4) has a transmission housing (5), the transmission housing having a first transmission input (6) for connecting a drive shaft (9) to the drive unit (3), a second transmission input (7) for connecting the steering shaft (10) to the sensor unit (2), and a transmission output (8) for connecting an output shaft (11) to at least one steerable wheel, wherein the drive unit (3) is connected to the transmission housing (5) at the first transmission input (6), and the sensor unit (2) is connected to the transmission housing (5) at the second transmission input (7), Characterized in that The sensor unit (2) and the drive unit (3) are electrically and / or in terms of signal technology interconnected by a wiring frame (17) arranged in the transmission housing (5).

2. The steering system (1) according to claim 1, characterized in that, The wiring frame (17) is rigid or substantially rigid.

3. The steering system (1) according to claim 1 or 2, characterized in that, The wiring frame (17) has a plurality of independent conductors (20) insulated from each other, and the independent conductors respectively form electrical contacts (22) for at least indirectly connecting the drive unit (3) and / or the sensor unit (2) at their free ends.

4. The steering system (1) according to any one of the preceding claims, characterized in that The wiring frame (17) has an electrically insulating potting body (21).

5. The steering system (1) according to any one of the preceding claims, characterized in that, The wiring frame (17) forms a first wiring interface (18) for electrically connecting the drive unit (3) on one side of the first transmission input (6), and forms a second wiring interface (19) for electrically connecting the sensor unit (2) on one side of the second transmission input (7), wherein the first wiring interface (18) and / or the second wiring interface (19) are configured to form an electrical plug connection (23).

6. The steering system (1) according to claim 5, characterized in that, The first wiring interface (18) and / or the second wiring interface (19) for forming the electrical plug connection (23) are configured as a socket integrated in the transmission housing (5) or a plug integrated in the transmission housing (5).

7. The steering system (1) according to claim 5 or 6, characterized in that, The control device (16) has a circuit board (29), wherein the circuit board (29) is directly connected to the first wiring interface (18) through a circuit board connector (31) or through at least one electrical intermediate component (30).

8. The steering system (1) according to claim 7, characterized in that, The electrical intermediate component (30) is configured as another wiring frame (33), and the another wiring frame connects the circuit board (29) to the first wiring interface (18).

9. The steering system (1) according to claim 7, characterized in that, The electrical intermediate component (30) is configured as a protected lead-through connecting cable (34) which connects the circuit board (29) to the first connection interface (18).

10. The steering system (1) according to any one of claims 5 to 9, characterized in that, The at least one sensor (13) is connected to the second connection interface (19) by a protected lead-through connection cable.

11. The steering system (1) according to any one of the preceding claims, characterized in that, The transmission housing (5) has a guide profile (26) which is complementary to the connection frame (17), wherein the connection frame (17) interacts with the guide profile (26) in a form-fitting and / or force-fitting manner.

12. The steering system (1) according to claim 11, characterized in that, The guide profile (26) is formed by at least one guide groove (27) into which the connection frame (17) is at least partially inserted.

13. The steering system (1) according to any one of the preceding claims, characterized in that, The transmission housing (5) has at least one fastening receptacle, and the connection frame (17) has at least one fastening section (28), wherein the fastening section (28) is received in the fastening receptacle in a form-fitting and / or force-fitting manner.

14. The steering system (1) according to any one of the preceding claims, characterized in that, The connection frame (17) is formed on the inner contour of the transmission housing (5).

15. A vehicle having an electric steering system (1) according to any one of the preceding claims.

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