Steering system and steering angle transmission thereof

Abstract

The application relates to a steering system and a steering angle transmission device thereof, the steering angle transmission device comprising a transmission mechanism, a transmission shaft rod, a gear transmission mechanism and a support shaft rod, the gear transmission mechanism having an input end and an output end, the input end being connected with the transmission shaft rod, and the output end being connected with the support shaft rod; wherein linear motion of the transmission shaft rod drives the support shaft rod to rotate along the axial direction of the support shaft rod through the gear transmission mechanism; a measured element is integrally arranged with the support shaft rod; and a measuring element comprises a measuring shell and a measuring sensor, the measuring shell being integrally arranged with the measuring sensor; wherein the measuring sensor is arranged to measure the rotation angle of the measured element. Power transmission and conversion of steering motion are realized through the transmission mechanism, the measured element and the support shaft rod are integrally arranged, and the measuring sensor and the measuring shell are integrally arranged, so that the integration of the steering angle transmission device is improved, the overall structure is relatively stable and is not prone to deformation, and the accuracy of the measured data is effectively ensured.

Description

Technical Field

[0001] This application relates to the field of vehicle steering control technology, and in particular to steering systems and their steering angle transmission devices. Background Technology

[0002] In the automotive technology field, four-wheel steering systems are increasingly widely used as a technology that can improve vehicle handling and stability. Among these systems, rear-wheel steering position sensors are incorporated to enhance the precision of rear-wheel steering control.

[0003] In related technologies, rear-wheel steering position sensors are primarily designed based on the principle of eddy currents, and include sensors, sliders, guide rails, fixed blocks, shafts, and housings. During the operation of a four-wheel steering system, the sensor provides real-time angle feedback, thereby achieving closed-loop control. For example, it compares the actual steering displacement with a preset target value and feeds back the deviation information to the Electronic Control Unit (ECU). The ECU dynamically adjusts the actuators based on this feedback information, correcting deviations in a timely manner, thereby improving the accuracy and response speed of the entire steering system, ensuring that the vehicle can steer accurately according to the driver's intentions, and enhancing driving safety and stability.

[0004] When the vehicle performs rear-wheel steering, the motor drive shaft slides inside the housing. A slider is securely mounted on the shaft by a fixing block and moves synchronously with the shaft's movement. The sensor's internal printed circuit board (PCBA) houses an excitation coil and a receiving coil. When the slider is in the magnetic field generated by the excitation coil, eddy currents are induced on its surface due to electromagnetic induction, generating a reverse magnetic field opposite to the excitation coil's magnetic field. This reverse magnetic field causes a corresponding change in the voltage signal of the receiving coil. During the slider's movement, the power signal output by the receiving coil exhibits a sine and cosine variation. Analyzing and processing this sine and cosine variation signal allows for precise calculation of the slider's position, thus determining the rear wheel steering angle. However, rear-wheel steering position sensors based on the eddy current principle involve numerous and large structural components, making measurement cumbersome. This undoubtedly increases the complexity and time cost of the production process, posing challenges to production efficiency and product quality control. Utility Model Content

[0005] Based on this, a steering system and its steering angle transmission device are provided. The structure is relatively simple, which reduces the complexity and time cost of the production process. It also has a high degree of integration, a relatively stable structure, and can ensure the accuracy of measurement data.

[0006] A steering angle transmission device, comprising:

[0007] The transmission mechanism includes a transmission shaft, a gear transmission mechanism, and a support shaft. The gear transmission mechanism has an input end and an output end. The input end is connected to the transmission shaft, and the output end is connected to the support shaft. The linear motion of the transmission shaft drives the support shaft to rotate along its axial direction through the gear transmission mechanism.

[0008] The component under test is integrally formed with the support shaft.

[0009] The measurement element includes a measurement housing and a measurement sensor, wherein the measurement housing and the measurement sensor are integrally disposed; wherein the measurement sensor is configured to measure the rotation angle of the measured element.

[0010] In one embodiment, the support shaft has a first end and a second end along its axial direction, and the measured element is disposed at the first end and / or the second end.

[0011] In one embodiment, the first end and / or the second end of the support shaft are provided with a first groove, and the measured element is embedded in the first groove.

[0012] In one embodiment, the element under test includes a magnet.

[0013] In one embodiment, the measuring sensor includes a magnetic field sensing chip, a circuit board, and a wiring harness. The magnetic field sensing chip is disposed on the circuit board, and the circuit board and the magnetic field sensing chip are jointly embedded in the measuring housing.

[0014] One end of the wire harness is connected to the circuit board, and the other end of the wire harness extends out of the measuring housing.

[0015] In one embodiment, the steering angle transmission device further includes a transmission housing, the transmission housing being provided with a first through channel and a second through channel communicating with each other, the first through channel and the second through channel being perpendicular to each other;

[0016] The transmission shaft is movably inserted through the first through channel, the support shaft is rotatably disposed in the second through channel, and the gear transmission mechanism is located in both the first through channel and the second through channel;

[0017] The transmission housing has a first side and a second side that are opposite to the second through channel along the axial direction of the support shaft; wherein the measuring element is disposed on the first side and / or the second side.

[0018] In one embodiment, the second through channel is provided with a limiting groove on one side of the first side and / or on one side of the second side, the limiting groove including at least one arc edge;

[0019] The limiting groove is configured to accommodate the support shaft, such that the arc edge fits against the radial sidewall of the support shaft.

[0020] In one embodiment, the gear transmission mechanism includes a drive rack and a drive gear. The drive rack extends along the axial direction of the transmission shaft and is connected to the transmission shaft. The drive gear is sleeved on the support shaft, and the drive rack meshes with the drive gear.

[0021] In one embodiment, the measured element and the support shaft are integrally formed by injection molding; and / or,

[0022] The measuring housing and the measuring sensor are integrally formed by injection molding.

[0023] A steering system includes a drive mechanism and a steering angle transmission device as described above, wherein the drive mechanism is connected to the steering angle transmission device.

[0024] The aforementioned steering system and its steering angle transmission device transmit power and convert steering motion through a transmission mechanism. The measured element, supporting shaft, measuring sensor, and measuring housing are all integrated, improving the integration of the steering angle transmission device. The overall structure is relatively stable and not easily deformed, effectively ensuring the accuracy of measurement data. This, in turn, improves the control precision and performance stability of the entire steering system, reducing vehicle driving safety and comfort. The measuring element accurately measures the rotation angle of the measured element, simplifying the structure and measurement, effectively reducing the complexity and time cost of the production process, improving production efficiency and product quality, thus providing reliable transmission and accurate rear wheel position measurement for automotive rear-wheel steering systems. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the steering angle transmission device in an exemplary embodiment.

[0026] Figure 2 This is an exploded view of a steering angle transmission device in an exemplary embodiment.

[0027] Figure 3 This is a top view schematic diagram of a steering angle transmission device in an exemplary embodiment.

[0028] Figure 4 for Figure 3 The diagram shows the AA section.

[0029] Figure 5 This is a schematic diagram of the gear transmission mechanism in an exemplary embodiment.

[0030] Figure 6 This is a schematic diagram of the transmission housing in an exemplary embodiment.

[0031] Figure 7 This is an exploded view of the transmission housing in an exemplary embodiment.

[0032] Figure label:

[0033] 1. Transmission mechanism; 11. Transmission shaft; 111. Receiving groove; 12. Gear transmission mechanism; 121. Input end; 122. Output end; 123. Drive rack; 124. Drive gear; 13. Support shaft; 131. First end; 1311. First groove; 132. Second end; 2. Component under test; 21. Magnet; 3. Measuring element; 31. Measuring housing; 32. Measuring sensor; 321. Magnetic field induction chip; 322. Circuit board; 323. Wiring harness; 4. Transmission housing; 41. First through channel; 42. Second through channel; 421. Limiting groove; 4211. Arc edge; 43. First side; 44. Second side; 45. Cover; 451. Limiting buckle; 46. Annular boss. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] In some exemplary embodiments, such as Figures 1-5 As shown, a steering angle transmission device is applied to steering systems in the automotive field, especially rear-wheel steering systems, and is mainly used to measure the position of the rear wheels. The steering angle transmission device includes a transmission mechanism 1, a measured element 2, and a measuring element 3, which cooperate to complete functions such as power transmission, steering motion conversion, and rear wheel position measurement.

[0041] In this embodiment, as Figures 1-5 As shown, the transmission mechanism 1 includes a transmission shaft 11, a gear transmission mechanism 12, and a support shaft 13. The linear motion of the transmission shaft 11 drives the support shaft 13 to rotate along its axial direction through the gear transmission mechanism 12.

[0042] The drive shaft 11, for example, is made of a metal material such as steel, which helps to improve its structural strength and extend its service life. The drive shaft 11 is connected to the wheel. Under the action of an external power source (not shown in the figure), such as the rotation of the steering wheel, the power transmitted through the drive mechanism and linkage mechanism can drive the drive shaft 11 to move linearly along its axis. Through the linkage structure with the wheel, the linear motion of the drive shaft 11 is converted into the deflection motion of the wheel, thus achieving wheel steering.

[0043] The gear transmission mechanism 12 has an input end 121 and an output end 122. The input end 121 is connected to the transmission shaft 11, and the output end 122 is connected to the support shaft 13. The connection method can be determined according to the actual situation, such as spline connection, key connection, or interference fit fixed connection, etc., to ensure the reliability of power transmission. The linear motion of the transmission shaft 11 is transmitted to the input end 121 of the gear transmission mechanism 12. Through the meshing transmission inside the gear transmission mechanism 12, the linear motion is converted into rotational motion and output from the output end 122, thereby driving the support shaft 13 to rotate along its axial direction.

[0044] First Example

[0045] The gear transmission mechanism 12 includes a drive rack 123 and a drive gear 124. The drive rack 123 extends along the axial direction of the transmission shaft 11 and is fixedly connected to the transmission shaft 11, thus moving synchronously with the transmission shaft 11. The drive rack 123 can be directly fixed to the radial sidewall of the transmission shaft 11, for example, by welding, riveting, or bolting, or injection-molded into the transmission shaft 11. This fixing method ensures the integrity of the transmission shaft 11, avoids complex machining on the transmission shaft 11, and helps improve the structural strength of the transmission shaft 11. At the same time, this connection method is relatively simple, with lower manufacturing and assembly costs.

[0046] Second example

[0047] The drive rack 123 can also be built into the drive shaft 11. For example, the radial sidewall of the drive shaft 11 is provided with a receiving groove 111, and the drive rack 123 is set in the receiving groove 111, with the height of the drive rack 123 being less than or equal to the groove depth of the receiving groove 111. This design avoids increasing the radial dimension of the drive shaft 11, reducing space occupation, and is especially suitable for applications with high requirements for vehicle chassis space. During the manufacturing process, the receiving groove 111 can be machined on the drive shaft 11 first, and then the drive rack 123 can be installed into the receiving groove 111 and fixed by interference fit, adhesive, snap-fit, or injection molding into the receiving groove 111.

[0048] Third Example

[0049] The drive rack 123 can be integrally formed with the transmission shaft 11, enhancing the overall structural strength and reducing potential problems such as loosening and wear due to component connections, thereby improving the stability and reliability of the transmission system. For example, a machining position can be selected on the transmission shaft 11 according to the preset dimensions of the drive rack 123, and machining can be performed using tools such as a cutting tool. During the cutting process, the cutting tool moves along a set trajectory, gradually removing material and gradually forming the tooth shape of the drive rack 123.

[0050] The drive gear 124 is sleeved on the support shaft 13, and the drive rack 123 is meshed with the drive gear 124. When the transmission shaft 11 moves along its axial direction, it drives the drive rack 123 to move, and the drive gear 124 rotates synchronously, thereby driving the support shaft 13 to rotate along its axial direction. By reasonably designing the number of teeth in the gear transmission mechanism 12, a specific transmission ratio can be achieved to meet the measurement requirements of the rear wheel position for different vehicle models.

[0051] In this embodiment, as Figures 1-5 As shown, to achieve a tight connection between the tested element 2 and the support shaft 13, while also meeting the requirements of efficient utilization of vehicle chassis space, the tested element 2 and the support shaft 13 can be integrated into one unit. This ensures sufficient connection strength between the tested element 2 and the support shaft 13, preventing loosening or separation under various complex external forces during vehicle operation. The integrated structure effectively reduces the space occupied by the vehicle chassis, providing more space for the layout of other chassis components.

[0052] Specifically, the tested component 2 and the support shaft 13 can be integrally formed by injection molding. For example, a mold for injection molding the support shaft 13 is provided, which needs to have an insert groove to accommodate the tested component 2. The tested component 2 is placed into the insert groove of the injection mold and positioned to the target location. The selected injection material is added to the hopper of the injection molding machine and heated to a molten state by a heating device. Then, the injection device of the injection molding machine is started, and the molten injection material is injected into the mold cavity at a certain pressure and speed. After the injection material fills the mold cavity, the holding pressure stage is entered to ensure that the tested component 2 and the support shaft 13 can be tightly bonded. After the holding pressure is completed, the cooling stage begins. After the injection material has completely cooled and solidified, the mold opening mechanism of the injection molding machine is started to separate the moving mold and the fixed mold. Then, the integrally formed support shaft 13 and the tested component 2 are ejected from the mold using the ejection mechanism.

[0053] Through the aforementioned injection molding integrated process, an integrated product in which the measured element 2 and the support shaft 13 are tightly combined can be obtained. Depending on the actual design requirements, the measured element 2 can be partially exposed on the end face of the support shaft 13 to facilitate connection and signal transmission with external measuring equipment; alternatively, it can be completely embedded inside the support shaft 13, protecting the measured element 2 while making the product structure more compact.

[0054] The measured element 2 may be designed as a disc with a certain angle marking, so that the measuring element 3 can more accurately measure its rotation angle. The angle marking can be achieved by engraving scale lines on the surface of the disc, making the measurement more intuitive. Alternatively, the measured element 2 may include a magnet 21, which can be magnetized by NS, so that it can be detected by the measuring element 3 when it rotates in a magnetic field.

[0055] It should be noted that the number of the measured element 2 can be set according to the actual situation. For example, there can be one or two measured elements 2. The support shaft 13 has a first end 131 and a second end 132 along its axial direction.

[0056] When there is one component under test 2, the component under test 2 can be provided with a first end 131 or a second end 132, depending on the actual requirements. When there are two components under test 2, the components under test 2 are respectively provided with the first end 131 and the second end 132.

[0057] The tested component 2 can be directly connected to the support shaft 13, reducing assembly difficulty and effectively improving manufacturing efficiency. Alternatively, the first end 131 of the support shaft 13 can be provided with a first groove 1311, in which the tested component 2 is embedded, providing protection for the tested component 2 and preventing damage from external impacts during use. Simultaneously, it improves the integration between the tested component 2 and the support shaft 13, forming a unified whole, making the entire structure more compact, reducing space occupation, and facilitating installation within the limited space of the automotive chassis. Furthermore, the first groove 1311 also acts as a limiting element for the tested component 2, improving stability during installation and preventing misalignment or detachment.

[0058] Of course, it is understandable that the support shaft 13 is not limited to having the first groove 1311 at the first end 131, but can also be set at the second end 132, or both the first end 131 and the second end 132 can be set at the same time, depending on the design of the component 2 being measured.

[0059] In this embodiment, as Figures 1-5 As shown, the measuring element 3 includes a measuring housing 31 and a measuring sensor 32, which can be integrated into one unit. This integrated design reduces assembly errors between components and improves the overall stability, reliability, and integration of the measuring element 3. It is understood that the implementation of this integrated design is the same as or similar to the implementation of the integrated design of the measured element 2 and the support shaft 13, and will not be repeated here.

[0060] The measuring sensor 32 is configured to measure the rotation angle of the measured element 2. Its selection complements that of the measured element 2 to ensure that the measurement function can be realized. For example, when the measured element 2 is a disk-shaped object with a certain angle marking, the measuring sensor 32 can be a sensor capable of recognizing the angle marking, such as a photoelectric sensor, to facilitate its identification.

[0061] Alternatively, when the measured element 2 is a magnet, the measuring sensor 32 can be a Hall sensor. Exemplarily, the measuring sensor 32 includes a magnetic field sensing chip 321, a printed circuit board assembly (PCBA), and a wiring harness 323. The magnetic field sensing chip 321 is disposed on the circuit board 322, and the circuit board 322 and the magnetic field sensing chip 321 are jointly embedded within the measuring housing 31. The measuring housing 31 is made of plastic, and after the magnetic field sensing chip 321 is connected to the circuit board 322, the magnetic field sensing chip 321 and the circuit board 322 can be encapsulated by injection molding.

[0062] The sensors used in this technology are expensive, and the selection of related chip products on the market is limited, with only single-output chips available, and their functional safety level (Automotive Safety Integrity Level C, or ASIL) is C. However, the system requires ASIL D, so it is necessary to use two chips (integrated circuit, or IC), which greatly increases the hardware cost of the sensor, and there is limited room for cost reduction.

[0063] In this example, the magnetic field sensing chip 321 is a Hall effect chip with dual-channel functionality, such as the Feixian FI6900, Allegro A31315, and Melexos MLX90423. One end of the wiring harness 323 is connected to the circuit board 322, such as by soldering, to improve the reliability of the connection. The other end of the wiring harness 323 extends out of the measuring housing 31 to facilitate electrical connection with other components in the steering system.

[0064] When the measured element 2 rotates with the support shaft 13, if the measured element 2 is a magnet, the position of the magnet relative to the Hall sensor changes, and the magnetic field acts on the three-dimensional space where the Hall chip is located. This causes the Hall sensor to detect the change in the magnetic field and convert it into an electrical signal output. By processing and analyzing these electrical signals, the rotation angle of the measured element 2 can be accurately calculated.

[0065] For example, the magnetic declination can be calculated using the formula atan(BX / BY). When the magnet rotates, the magnetic field changes, and the magnetic declination ranges from 0° to 360°. For example, a magnetic declination of 360° corresponds to the total stroke of the drive rack 123. For instance, if the total stroke of the drive rack 123 is 72mm and the drive gear 124 rotates 360°, then the position of the rear wheel can be calculated by multiplying (72 / 360) by the magnetic declination.

[0066] During installation, it is essential to ensure a suitable relative position and distance between the measuring sensor 32 and the measured element 2 to guarantee measurement accuracy. Typically, the measuring element 3 is fixed in a suitable location on the steering system, such as the steering gear housing. By adjusting the installation angle and position, the measuring sensor 32 can accurately detect the rotational movement of the measured element 2. The measuring housing 31 of the measuring element 3 is equipped with connecting lugs 311, which can be used to secure the element to the target position using bolts, thus improving its stability. Adjusting the installation angle and position allows the measuring sensor 32 to accurately detect the rotational movement of the measured element 2.

[0067] Understandably, one measuring element 3 can be installed, positioned on one side of the support shaft 13 along its axial direction, corresponding to the measured element 2. Since the Hall chip has dual-channel functionality, it can meet ASIL D requirements, ensuring both measurement functionality and system safety. Alternatively, two measuring elements 3 can be installed, one on each side of the support shaft 13 along its axial direction, corresponding one-to-one with the measured element 2, achieving redundancy. When one measuring element 3 fails, the other can still function normally, continuing to provide accurate measurement data, thereby improving the reliability and stability of the entire steering system. Furthermore, the accuracy of the data can be verified; if the data from the two measuring elements 3 are inconsistent, they can be inspected to identify the problem.

[0068] In this embodiment, the steering angle transmission device transmits power and converts steering motion through the transmission mechanism 1. The measured element 2, the supporting shaft 13, the measuring sensor 32, and the measuring housing 31 are all integrated, improving the integration of the steering angle transmission device. The overall structure is relatively stable and not easily deformed, effectively ensuring the accuracy of the measurement data. This, in turn, improves the control precision and performance stability of the entire steering system, reducing vehicle driving safety and comfort. The measuring element 3 accurately measures the rotation angle of the measured element 2, simplifying the structure and measurement, effectively reducing the complexity and time cost of the production process, improving production efficiency and product quality, thereby providing reliable transmission and accurate rear wheel position measurement for the automotive rear wheel steering system.

[0069] In some exemplary embodiments, such as Figures 1-7 As shown, the steering angle transmission device also includes a transmission housing 4, which provides installation and support space for various components and serves to protect and position them. The transmission housing 4 is made of high-strength metal materials, such as aluminum alloy or steel, to ensure it can withstand various complex forces and vibrations during vehicle operation, while also having good heat dissipation performance.

[0070] The transmission housing 4 is provided with a first through channel 41 and a second through channel 42 that are connected to each other. The first through channel 41 and the second through channel 42 are perpendicular to each other.

[0071] The drive shaft 11 is movably inserted through the first through channel 41. The diameter of the first through channel 41 is designed according to the size of the drive shaft 11 to ensure that the drive shaft 11 can move smoothly within it. In order to reduce the frictional force when the drive shaft 11 moves, a wear-resistant bushing can be provided between the drive shaft 11 and the inner wall of the first through channel 41. The wear-resistant bushing is made of self-lubricating materials such as polytetrafluoroethylene and has good wear resistance and self-lubricating properties.

[0072] The support shaft 13 is rotatably mounted in the second through channel 42, the height of which is adapted to the support shaft 13, providing stable support for its rotation. A rolling bearing can be installed between the support shaft 13 and the second through channel 42. The inner ring of the rolling bearing is fixedly connected to the support shaft 13, and the outer ring is fixedly connected to the inner wall of the second through channel 42. The rolling bearing is a deep groove ball bearing or a tapered roller bearing, capable of withstanding the radial and axial forces generated during the rotation of the support shaft 13, ensuring the smoothness and flexibility of its rotation.

[0073] The gear transmission mechanism 12 is located in the intersection area of ​​the first through channel 41 and the second through channel 42. When the transmission shaft 11 moves along the first through channel 41, the drive rack 123 moves accordingly, and the drive gear 124 rotates under the action of the drive rack 123, thereby driving the support shaft 13 to rotate in the second through channel 42.

[0074] The transmission housing 4 has a first side 43 and a second side 44 along the axial direction of the support shaft 13 and opposite to the second through channel 42. The first side 43 and the second side 44 cooperate with the measuring element 3 to improve the stability of the measuring element 3. For example, when the measuring element 3 is installed on the first side 43, a mounting plane and a positioning hole are provided on the first side 43, and the measuring element 3 is fixed to the mounting plane by bolts passing through the positioning holes. The measuring sensor 32 of the measuring element 3 faces the measured element 2 to ensure accurate detection of the rotational movement of the measured element 2. This installation method is suitable when the rotation center of the measured element 2 is close to the first side 43 and the spatial layout is reasonable.

[0075] If the measuring element 3 is installed on the second side 44, a corresponding mounting structure and positioning device are also provided on the second side 44. After the measuring element 3 is fixed, its measuring sensor 32 maintains a suitable relative position and distance with the measured element 2 to ensure measurement accuracy. This installation method can avoid interference from other components around the first side 43 to the measuring element 3, and is suitable for situations where the space on the first side 43 is relatively compact.

[0076] To improve the reliability and redundancy of the measurement, measuring elements 3 can be simultaneously installed on the first side 43 and the second side 44. The two measuring elements 3 measure the component 2 under test and transmit the measurement data to the control unit of the steering system. If one measuring element 3 fails, the other measuring element 3 can still function normally, ensuring the safe operation of the steering system.

[0077] The steering angle transmission device in this embodiment achieves an organic combination of transmission, measurement and other functions through the reasonable layout of various components in the transmission housing 4, providing reliable technical support for the automotive steering system.

[0078] In this embodiment, as Figures 1-7 As shown, the second through channel 42 is provided with a limiting groove 421 on one side of the first side portion 43. The limiting groove 421 includes at least one arc edge 4211. The radius of the arc edge 4211 is designed according to the diameter of the support shaft 13, so that the arc edge 4211 can fit well with the radial sidewall of the support shaft 13.

[0079] The limiting groove 421 is configured to accommodate a portion of the support shaft 13, such that the arc edge 4211 fits snugly against the radial sidewall of the support shaft 13. Specifically, when the support shaft 13 is installed into the second through channel 42, the corresponding portion of the support shaft 13 is embedded in the limiting groove 421, with the arc edge 4211 tightly fitting against the radial sidewall of the support shaft 13. This fitting design effectively restricts the axial movement of the support shaft 13 within the second through channel 42, preventing the support shaft 13 from shifting due to axial force during rotation, thereby improving the stability and reliability of the support shaft 13's rotation.

[0080] In this embodiment, as Figures 1-7 As shown, the transmission housing 4 is also provided with a cover 45, which is connected to the transmission housing 4 to cover the second through channel 42. During vehicle operation, dust, moisture, and other impurities may enter the second through channel 42. These impurities can affect the rotational performance of the support shaft 13 and even cause damage to components. The cover 45 can effectively prevent external impurities from entering the second through channel 42, protecting the internal support shaft 13 and rolling bearings, and extending their service life.

[0081] The cover 45 is also provided with a limiting buckle 451, which can limit the support shaft 13 to prevent it from moving in the radial direction and affecting the meshing between the drive gear 124 and the drive rack 123. The limiting buckle 451 is provided with an arc surface 4511, which can fit against the support shaft 13.

[0082] The cap 45 is, for example, a plastic injection molded part made of engineering plastics such as polyamide (PA) and polycarbonate (PC), which gives the cap 45 advantages such as high strength, good toughness, corrosion resistance and light weight, and can meet the usage requirements of the cap 45.

[0083] The cover 45 has multiple bolt holes for bolt connection and fixation to the transmission housing 4. The number and location of the bolt holes are designed according to the size of the cover 45 and the stress conditions, generally 3-6 bolt holes are provided, evenly distributed along the edge of the cover 45. During installation, first align the cover 45 with the mounting position on the transmission housing 4, aligning the bolt holes with the threaded holes on the transmission housing 4, then screw in the bolts one by one and tighten them to ensure a tight connection between the cover 45 and the transmission housing 4 without any loosening.

[0084] In addition, the transmission housing 4 may also be provided with an annular boss 46 on the cover 45. The annular boss 46 can increase the depth of the second through channel 42 and also increase the local strength.

[0085] This disclosure also provides a steering system, including a drive mechanism and a steering angle transmission device, wherein the drive mechanism is connected to the steering angle transmission device. The steering angle transmission device is responsible for transmitting and converting the power generated by the drive mechanism to achieve the steering action of the wheels. The specific structure and arrangement of the steering angle transmission device have been described in detail in the above embodiments and will not be repeated here.

[0086] The drive mechanism provides power to the entire steering system, driving the drive shaft 11 in the steering angle transmission device to move, thereby driving other components to work together to complete the steering function. The drive mechanism is configured to drive the drive shaft 11 to move linearly along its axis. The drive shaft 11 drives the support shaft 13 to rotate along its axis through the gear transmission mechanism 12. Then, the linear motion of the drive shaft 11 is converted into the deflection motion of the wheels through the wheel linkage mechanism, realizing wheel steering. The drive mechanism and wheel linkage mechanism adopt the conventional structure of steering systems in related technologies, so they will not be described in detail.

[0087] Depending on different design requirements and application scenarios, the drive mechanism may be configured in different ways. For example, it may be driven directly by a drive motor, or it may be provided with a drive belt, drive linkage, etc. The specific configuration depends on the actual situation, and no specific limitation is made here.

[0088] The steering system in this embodiment, through the rational design of the drive mechanism's structure and working principle, and the precise coordination and control with the steering angle transmission device, can efficiently and stably realize the steering function of the wheels, while also possessing a safety protection mechanism, thus improving the system's reliability and safety.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A steering angle transmission device, characterized in that, include: The transmission mechanism includes a transmission shaft, a gear transmission mechanism, and a support shaft. The gear transmission mechanism has an input end and an output end. The input end is connected to the transmission shaft, and the output end is connected to the support shaft. The linear motion of the transmission shaft drives the support shaft to rotate along its axial direction through the gear transmission mechanism. The component under test is integrally formed with the support shaft. The measurement element includes a measurement housing and a measurement sensor, wherein the measurement housing and the measurement sensor are integrally disposed; wherein the measurement sensor is configured to measure the rotation angle of the measured element.

2. The steering angle transmission device according to claim 1, characterized in that, The support shaft has a first end and a second end along its axial direction, and the measured element is disposed at the first end and / or the second end.

3. The steering angle transmission device according to claim 2, characterized in that, The first end and / or the second end of the support shaft are provided with a first groove, and the measured element is embedded in the first groove.

4. The steering angle transmission device according to claim 1, characterized in that, The component under test includes a magnet.

5. The steering angle transmission device according to claim 4, characterized in that, The measuring sensor includes a magnetic field sensing chip, a circuit board, and a wiring harness. The magnetic field sensing chip is disposed on the circuit board, and the circuit board and the magnetic field sensing chip are embedded together in the measuring housing. One end of the wire harness is connected to the circuit board, and the other end of the wire harness extends out of the measuring housing.

6. The steering angle transmission device according to claim 1, characterized in that, The steering angle transmission device further includes a transmission housing, which is provided with a first through channel and a second through channel, the first through channel and the second through channel being perpendicular to each other; The transmission shaft is movably inserted through the first through channel, the support shaft is rotatably disposed in the second through channel, and the gear transmission mechanism is located in both the first through channel and the second through channel; The transmission housing has a first side and a second side that are opposite to the second through channel along the axial direction of the support shaft; wherein the measuring element is disposed on the first side and / or the second side.

7. The steering angle transmission device according to claim 6, characterized in that, The second through channel is provided with a limiting groove on one side of the first side and / or on one side of the second side, the limiting groove including at least one arc edge; The limiting groove is configured to accommodate the support shaft, such that the arc edge fits against the radial sidewall of the support shaft.

8. The steering angle transmission device according to claim 6, characterized in that, The gear transmission mechanism includes a drive rack and a drive gear. The drive rack extends along the axial direction of the transmission shaft and is connected to the transmission shaft. The drive gear is sleeved on the support shaft, and the drive rack meshes with the drive gear.

9. The steering angle transmission device according to claim 1, characterized in that, The tested component and the supporting shaft are integrally formed by injection molding; and / or, The measuring housing and the measuring sensor are integrally formed by injection molding.

10. A steering system, characterized in that, It includes a drive mechanism and a steering angle transmission device as described in any one of claims 1-9, wherein the drive mechanism is connected to the steering angle transmission device.

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