Automobile kingpin steering gear for independent steering of vehicle

Abstract

The utility model discloses an automobile kingpin steering gear for independent steering of a vehicle, which belongs to the technical field of vehicle engineering and comprises a steering motor controller, a steering motor and a steering speed reducer, and the steering motor controller controls the steering motor to drive a steering output shaft of the steering motor to rotate through the steering speed reducer; the device further comprises a rotating suspension connecting lug and a rotating angle sensor. The steering motor controller, the steering motor, the steering speed reducer and the rotary suspension connecting lug are sequentially connected from top to bottom, and a steering output shaft of the steering speed reducer downwards penetrates through the rotary suspension connecting lug and extends out; the rotary suspension connecting lug is connected with the suspension system; the rotating angle sensor is arranged in the rotating suspension connecting lug and used for detecting the rotating angle of the steering output shaft. The system has the advantages of being high in integration level, good in matching performance, accurate in control, convenient to install and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle engineering, and relates to an automobile kingpin steering gear, in particular to an automobile kingpin steering gear used for independent steering of the vehicle. Background Art

[0002] The independent steer-by-wire system replaces the mechanical connection between the steering wheel and steering wheels with an electronic wiring harness, eliminating any mechanical coupling between the individual steering wheels. During operation, the motor controller in the steering gear receives signals from the vehicle controller and controls the three-phase terminal voltage of the steering motor to achieve the desired steering angle and fulfill the driver's steering intent. This allows the vehicle controller's software-designed algorithms to implement technologies such as distributed steering and variable-ratio steering, improving vehicle drivability.

[0003] Currently, independent steer-by-wire systems require the steering assembly to be located at the wheel end, while also taking into account the layout of the suspension system. This poses challenges in terms of spatial integration and layout. Therefore, there is an urgent need for a kingpin steering gear with high integration and good compatibility with traditional chassis systems. Utility Model Content

[0004] The utility model provides an automobile kingpin steering gear for independent steering of the vehicle, so as to overcome the defects of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A kingpin steering gear for an automobile used for independent vehicle steering is used to be connected to a suspension system and includes a steering motor controller, a steering motor, a steering reducer and a steering reducer. The steering motor controller controls the steering motor to drive its steering output shaft to rotate via the steering reducer; it also includes a rotation suspension connecting ear and a rotation angle sensor. The steering motor controller, the steering motor, the steering reducer and the rotation suspension connecting ear are connected in sequence from top to bottom, the steering output shaft of the steering reducer passes downward through the rotation suspension connecting ear and extends out; the rotation suspension connecting ear is connected to the suspension system; the rotation angle sensor is arranged in the rotation suspension connecting ear to detect the rotation angle of the steering output shaft.

[0007] To optimize the above technical solutions, specific measures taken also include:

[0008] Furthermore, the rotation angle sensor is sleeved on the steering output shaft, the sensor rotor is matched with the steering output shaft, and the sensor stator is matched with the inner wall of the rotary suspension connecting ear.

[0009] Furthermore, an ear piece bearing is provided in the swivel suspension connecting ear; the inner ring and outer ring of the ear piece bearing cooperate with the steering output shaft and the swivel suspension connecting ear respectively; a shaft shoulder is provided in the swivel suspension connecting ear; the ear piece bearing is arranged between the shaft shoulder at the upper end of the steering output shaft and the shaft shoulder in the swivel suspension connecting ear; the rotation angle sensor is located below the ear piece bearing.

[0010] Furthermore, a reducer sealing ring is provided in the rotary suspension connecting ear; the inner ring and outer ring of the reducer sealing ring cooperate with the steering output shaft and the rotary suspension connecting ear respectively; the reducer sealing ring is arranged below the ear piece bearing to seal the ear piece bearing; the rotation angle sensor is located below the reducer sealing ring to press the reducer sealing ring in the axial direction.

[0011] Furthermore, a skeleton oil seal is provided in the rotation suspension connecting ear; the inner ring and outer ring of the skeleton oil seal cooperate with the steering output shaft and the rotation suspension connecting ear respectively; the skeleton oil seal is provided below the rotation angle sensor to seal the rotation angle sensor.

[0012] Furthermore, the skeleton oil seal is equipped with an oil seal retaining spring; the oil seal retaining spring is clamped in a groove on the inner wall of the swivel connecting ear and is located below the skeleton oil seal to achieve axial positioning of the skeleton oil seal.

[0013] Furthermore, the rotation angle sensor is equipped with a sensor retaining spring; the sensor retaining spring is clamped on the steering output shaft and is located below the sensor rotor to achieve axial positioning of the rotation angle sensor.

[0014] Furthermore, the outer surface of the sensor stator of the rotation angle sensor has at least one positioning protrusion, and the inner wall of the rotation suspension connecting ear has a positioning groove matching the positioning protrusion. The positioning protrusion is inserted into the corresponding positioning groove to achieve fixed constraint between the sensor stator and the rotation suspension connecting ear.

[0015] Furthermore, it also includes a side wiring box; the side wiring box is fixed on the side of the steering motor, steering reducer and steering suspension connecting ear, and the upper end is connected to the housing of the steering motor controller; the sensor wiring harness of the angle sensor passes through the steering suspension connecting ear and is connected to the steering motor controller through the side wiring box.

[0016] Furthermore, the steering motor controller and the steering motor are fixed by welding the pins inside the steering motor controller to the pins of the steering motor; the output shaft gear of the steering motor is engaged with the planetary gear of the steering reducer to realize power transmission and complete radial constraint at the same time; the steering motor is fixed to the flange plate on the steering reducer by flange bolts to complete axial constraint; the steering reducer and the steering suspension connecting ear are fixedly connected by flange bolts.

[0017] The beneficial effects of this utility model include providing an automotive kingpin steering gear for independent vehicle steering that integrates a steering motor controller, a steering motor, a steering reducer, and an automotive-grade steering angle sensor. This solves the problems of low steering system integration and the memory of steering angles before and after power is turned on and off in independent steering systems. Furthermore, the kingpin steering gear improves compatibility between independent steering systems and traditional suspension systems through the use of a rotary suspension lug.

[0018] Specifically, first, the present invention utilizes the mechanical coupling of the planetary reducer, and realizes the coupling of the suspension load capacity and the steering load force by connecting the rotating suspension connecting ear with the suspension arm, thereby improving the integration of the independent steering system and the suspension system. Secondly, the present invention adopts an inner wiring method, connecting the sensor wiring harness to the steering motor controller on the top through the side wiring box, thereby improving the degree of integration. Finally, the angle sensor is arranged at the output end of the steering reducer, which realizes the calibration of the angle sensor and the motor's built-in encoder, and can realize the control compensation of the reducer gap; at the same time, when either the angle sensor or the motor's built-in encoder fails, the other can be used as a backup to ensure the safety of the car's kingpin steering gear in controlling the wheel angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the external structure of a car's kingpin steering gear;

[0020] Figure 2 It is a cross-sectional structural diagram of a kingpin steering gear of an automobile;

[0021] Figure 3 This is a schematic diagram of the connection relationship between the steering angle sensor, the steering output shaft and the steering suspension connector. DETAILED DESCRIPTION

[0022] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0023] like Figure 1 and Figure 2 As shown, the utility model provides an automobile kingpin steering gear for independent vehicle steering, including a steering motor controller 1, a steering motor 2, a steering reducer 3, a steering suspension connecting ear 4, a rotation angle sensor 5 and a side wiring box 6.

[0024] The steering motor controller 1 controls the steering motor 2 to drive its steering output shaft 31 to rotate through the steering reducer 3. The steering motor controller 1, the steering motor 2, the steering reducer 3 and the steering suspension connecting ear 4 are connected in sequence from top to bottom. The steering suspension connecting ear 4 is a hollow structure, and the steering output shaft 31 of the steering reducer 3 passes downward through the steering suspension connecting ear 4 and extends out. The steering suspension connecting ear 4 is rotationally connected to the suspension arm A of the suspension system. The angle sensor 5 is arranged in the steering suspension connecting ear 4 to detect the rotation angle of the steering output shaft 31, that is, to detect the rotation angle of the kingpin below. The angle sensor 5 is an automotive-grade angle sensor 5.

[0025] Specifically, such as Figure 2 As shown, an ear piece bearing 41 , a reducer sealing ring 42 and a skeleton oil seal 43 are further provided in the rotary suspension connecting ear 4 .

[0026] The inner and outer rings of the ear bearing 41 respectively mate with the steering output shaft 31 and the pivot lug 4. Specifically, the ear bearing 41 fits over the steering output shaft 31 and is positioned between them. The pivot lug 4 has a shoulder. The ear bearing 41 is positioned between a shoulder at the upper end of the steering output shaft 31 and a shoulder within the pivot lug 4. This ensures axial positioning of the ear bearing 41 via the shoulders of the steering output shaft 31 and the pivot lug 4.

[0027] The inner and outer rings of the reducer seal 42 respectively cooperate with the steering output shaft 31 and the rotary suspension connecting ear 4. That is, the reducer seal 42 is sleeved on the steering output shaft 31 and is located between the steering output shaft 31 and the rotary suspension connecting ear 4. The reducer seal 42 is arranged below the ear piece bearing 41 to seal the ear piece bearing 41.

[0028] The rotation angle sensor 5 is located below the reducer seal 42, compressing it axially. It is mounted on the steering output shaft 31, between it and the steering suspension lug 4. The sensor rotor 51 engages with the steering output shaft 31, while the sensor stator 52 engages with the inner wall of the steering suspension lug 4, thereby detecting the rotation angle of the steering output shaft 31.

[0029] like Figure 2 and Figure 3 As shown, in a specific embodiment, the rotation angle sensor 5 is equipped with a sensor retaining spring 53. The sensor retaining spring 53 is clamped onto the steering output shaft 31, located below the sensor rotor 51, to achieve axial positioning of the rotation angle sensor 5. The outer surface of the sensor stator 52 has two positioning protrusions 54, and the inner wall of the rotary suspension lug 4 has positioning grooves 55 that match the positioning protrusions 54. The positioning protrusions 54 are inserted into the corresponding positioning grooves 55, achieving circumferential constraint between the sensor stator 52 and the rotary suspension lug 4.

[0030] The inner and outer rings of the skeleton oil seal 43 mate with the steering output shaft 31 and the rotary suspension lug 4, respectively. Specifically, the skeleton oil seal 43 fits over the steering output shaft 31 and is positioned between these two lugs. The skeleton oil seal 43 is positioned below the rotation angle sensor 5 to provide a seal. The skeleton oil seal 43 is equipped with an oil seal retaining spring 431. This retaining spring 431 engages a groove in the inner wall of the rotary suspension lug 4, positioned below the skeleton oil seal 43, ensuring axial positioning of the skeleton oil seal 43.

[0031] A side wiring box 6 is fixed to the side of the steering motor 2, steering reducer 3, and steering suspension lug 4. Its upper end is connected to the housing of the steering motor controller 1. The sensor harness of the steering angle sensor 5 passes through the steering suspension lug 4 and is connected to the steering motor controller 1 through the side wiring box 6, transmitting the signal from the steering angle sensor 5 to the steering motor controller 1 in real time.

[0032] The steering motor controller 1 and steering motor 2 are secured by welding pins inside the steering motor controller 1 to the pins of the steering motor 2. The output shaft gear 21 of the steering motor 2 meshes with the planetary gears 32 of the steering reducer 3 to transmit power and provide radial restraint. The steering motor 2 is secured to the flange on the steering reducer 3 housing with flange bolts, providing axial restraint. The steering reducer 3 housing is securely connected to the steering suspension lug 4 with flange bolts.

[0033] The operating principle of this automotive kingpin steering system is as follows: the steering motor 2 outputs torque according to the instructions of the steering motor controller 1. The output torque of the steering drive motor is transmitted to the steering reducer 3 via a gear press-fitted on the motor output end. After being reduced by the steering reducer 3, the steering output shaft 31 is driven to rotate. The rotational suspension lug 4 is used to connect to the suspension system. The rotation angle sensor 5 is unloaded during the entire movement process and is used to detect the kingpin rotation angle. This is then verified against the target value of the steering motor controller 1 to complete iterative closed-loop tracking. It also serves as a backup detection device for the motor encoder.

[0034] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. cited in the present invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0035] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A kingpin steering gear for independent vehicle steering, connected to a suspension system, comprising a steering motor controller, a steering motor, and a steering reducer. The steering motor controller controls the steering motor to drive its steering output shaft to rotate via the steering reducer. The steering motor controller is characterized by: Also includes a rotation suspension connection ear and a rotation angle sensor; The steering motor controller, the steering motor, the steering reducer and the rotation suspension connecting ear are connected in sequence from top to bottom, and the steering output shaft of the steering reducer passes downward through the rotation suspension connecting ear and extends out; The rotary suspension connecting lug is connected to the suspension system; The rotation angle sensor is arranged in the rotation suspension connecting ear to detect the rotation angle of the steering output shaft.

2. The automobile kingpin steering gear for independent vehicle steering according to claim 1, characterized in that: The rotation angle sensor is sleeved on the steering output shaft, the sensor rotor is matched with the steering output shaft, and the sensor stator is matched with the inner wall of the rotation suspension connecting ear.

3. The automobile kingpin steering gear for independent vehicle steering according to claim 2, characterized in that: The rotating and hanging connecting ear is also provided with an ear piece bearing; The inner ring and outer ring of the ear bearing are matched with the steering output shaft and the rotary suspension connecting ear respectively; The rotating suspension connecting ear has a shaft shoulder; the ear piece bearing is arranged between the shaft shoulder at the upper end of the steering output shaft and the shaft shoulder in the rotating suspension connecting ear; The rotational angle sensor is located below the earpiece bearing.

4. The automobile kingpin steering gear for independent vehicle steering according to claim 3, characterized in that: A reducer sealing ring is also provided in the rotating and hanging connecting ear; The inner ring and outer ring of the reducer sealing ring are matched with the steering output shaft and the rotary suspension connecting ear respectively; The reducer sealing ring is arranged below the ear piece bearing to seal the ear piece bearing; The rotation angle sensor is located below the reducer sealing ring and presses the reducer sealing ring in the axial direction.

5. The automobile kingpin steering gear for independent vehicle steering according to claim 4, characterized in that: A skeleton oil seal is also provided in the rotating and hanging connecting ear; The inner ring and outer ring of the skeleton oil seal are matched with the steering output shaft and the rotary suspension connection ear respectively; The skeleton oil seal is arranged below the rotation angle sensor to seal the rotation angle sensor.

6. The automobile kingpin steering gear for independent vehicle steering according to claim 5, characterized in that: The skeleton oil seal is equipped with an oil seal retaining ring; the oil seal retaining ring is clamped in the groove of the inner wall of the rotating suspension connecting ear and is located below the skeleton oil seal to achieve axial positioning of the skeleton oil seal.

7. The automobile kingpin steering gear for independent vehicle steering according to claim 2, characterized in that: The rotation angle sensor is equipped with a sensor retaining spring, which is clamped on the steering output shaft and located below the sensor rotor to achieve axial positioning of the rotation angle sensor.

8. The automobile kingpin steering gear for independent vehicle steering according to claim 2, characterized in that: The outer surface of the sensor stator of the rotation angle sensor has at least one positioning protrusion, and the inner wall of the rotation suspension connecting ear has a positioning groove matching the positioning protrusion. The positioning protrusion is inserted into the corresponding positioning groove to achieve fixed constraint between the sensor stator and the rotation suspension connecting ear.

9. The automobile kingpin steering gear for independent vehicle steering according to claim 1, characterized in that: Also included is a side routing box; The side wiring box is fixed on the side of the steering motor, steering reducer and steering suspension connecting ear, and the upper end is connected to the housing of the steering motor controller; the sensor wiring harness of the angle sensor passes through the steering suspension connecting ear and is connected to the steering motor controller through the side wiring box.

10. The automobile kingpin steering gear for independent vehicle steering according to claim 1, characterized in that: The steering motor controller and the steering motor are fixed by welding the pins inside the steering motor controller and the pins of the steering motor; The output shaft gear of the steering motor meshes with the planetary gear of the steering reducer to achieve power transmission and complete radial constraint. The steering motor is fixed to the flange on the steering reducer by flange bolts to complete axial constraint. The steering reducer is fixedly connected to the rotary suspension connecting ear through flange bolts.

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