Birotor motor master pin steering device used in hub driving angle module

Abstract

A birotor motor kingpin steering device used in a hub driving angle module comprises a hub, a driving motor is integrated in the hub, a shell of the driving motor is fixedly connected with a steering knuckle, a kingpin steering device is fixedly arranged on the steering knuckle, and the kingpin steering device comprises a shell. A double-rotor motor and a planetary reducing mechanism are arranged in the shell, an inner rotor shaft of an inner rotor of the double-rotor motor is connected with a sun gear input shaft of the planetary reducing mechanism through a first clutch, and an outer rotor shaft of an outer rotor of the double-rotor motor is connected with a planet carrier input shaft of the planetary reducing mechanism through a second clutch. An output shaft of the planetary speed reduction mechanism is fixedly connected with the steering knuckle, a suspension fork arm is rotationally matched with the main pin steering device, and a suspension shock absorber is connected to the suspension fork arm.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle driving and steering, and in particular to a dual-rotor motor kingpin steering device used in a wheel hub drive angle module. Background Art

[0002] In-wheel drive technology integrates the drive motor directly into the wheel, eliminating components like the drive shaft and differential in traditional vehicles. This offers advantages such as flexible layout, high transmission efficiency, and improved space utilization. Traditional steering systems rely on mechanical connections, making them difficult to meet the requirements of in-wheel drive angle modules. Therefore, the steering design of in-wheel drive systems presents significant challenges. In particular, achieving high reliability and dynamic response in space-constrained steering environments remains a key research topic.

[0003] Kingpin motor steering technology is suitable for steer-by-wire systems, where the steering knuckle is directly driven by a motor to achieve steering, meeting the layout requirements of the wheel hub drive angle module. However, the motor kingpin steering system must have a redundant architecture. The current redundant solution is mainly dual-system redundancy, that is, a dual-motor solution, which works independently or collaboratively to meet the system redundancy requirements. However, the need for two independent motors makes the entire system heavier and larger, taking up more space, and having a complex structure, which poses the following problems: 1. Due to its heavy weight and large size, it is difficult to arrange the wheel hub angle module, which can easily cause the steering knuckle (also known as the ram's horn) to bear too much bending moment. Excessive bending moment on the steering knuckle will cause structural fatigue, resulting in reduced steering performance, increased tire wear, reduced vehicle stability, and increased vehicle safety risks and maintenance costs.

[0004] 2. The unsprung mass increases, the vehicle's handling decreases, and the dynamic response is delayed. At the same time, the load on the suspension system increases, and the shock absorbers, springs, etc. need to withstand greater impact force, resulting in fatigue damage and increased maintenance costs.

[0005] 3. There are many mechanical connections, resulting in greater inertia and friction, which affects dynamic performance.

[0006] 4. Two motors are required, which results in higher production costs. Summary of the Invention

[0007] In response to the above-mentioned problems, the present invention provides a dual-rotor motor kingpin steering device for use in a wheel hub drive angle module. By adopting a dual-rotor motor instead of a dual motor, it saves production costs, has a more compact structure, saves space, facilitates layout, improves vehicle stability, and enhances vehicle safety.

[0008] The technical solution of the present invention is: a dual-rotor motor kingpin steering device for a wheel hub drive angle module, comprising a wheel hub, a drive motor integrated inside the wheel hub, an outer shell of the drive motor fixedly connected to a steering knuckle, a kingpin steering device fixedly arranged on the steering knuckle, the kingpin steering device comprising a shell, a dual-rotor motor and a planetary reduction mechanism arranged inside the shell, the inner rotor shaft of the inner rotor of the dual-rotor motor is connected to the sun gear input shaft of the planetary reduction mechanism through a first clutch, the outer rotor shaft of the outer rotor is connected to the planetary carrier input shaft of the planetary reduction mechanism through a second clutch, the output shaft of the planetary reduction mechanism is fixedly connected to the steering knuckle, the kingpin steering device is rotatably matched with a suspension fork arm, and a suspension shock absorber is connected to the suspension fork arm.

[0009] Preferably, the inner rotor shaft, outer rotor shaft, sun gear input shaft, and output shaft are on the same axis.

[0010] Preferably, pin holes are provided on both sides of the suspension fork arm, and the suspension fork arm is connected to the kingpin steering device through a pin, so that the suspension fork arm rotates around the pin.

[0011] Preferably, the output shaft of the planetary reduction mechanism of the kingpin steering device is fixed to the steering knuckle by a plurality of bolts.

[0012] Preferably, the output shaft includes a first output shaft, a second output shaft, and an output flange. The first output shaft is fixed to one end of the second output shaft, and the other end of the second output shaft is provided with a flange. The flange and the output flange are both provided with multiple bolt holes. The flange and the output flange, and the output flange and the steering knuckle are fixed by bolts.

[0013] Preferably, the second output shaft is a hollow shaft, and the first output shaft is inserted into the inner hole of one end of the second output shaft to form an interference fit.

[0014] Preferably, the second output shaft is a hollow shaft, and the first output shaft is inserted into the inner hole of one end of the second output shaft to form a key fit.

[0015] Preferably, an output shaft protection shell is provided outside the output shaft for protecting the output shaft.

[0016] Preferably, a bearing is provided in the output shaft protection housing for supporting the second output shaft.

[0017] Preferably, the output shaft protection housing is connected and fixed to the housing of the kingpin steering device by bolts.

[0018] The advantages of the present invention are: 1. Compared with the traditional dual-motor redundant system, the dual-rotor system adopted in the present invention integrates two rotors into one motor, which has a more compact structure, saves space and is easy to arrange.

[0019] 2. The dual-rotor system of the present invention eliminates some components such as the housing, bearings, and reduction mechanisms, resulting in lower costs and lighter overall weight, which helps reduce unsprung mass and improve vehicle handling and efficiency. 3. The dual-rotor system of the present invention has a compact structure, which makes it easy to arrange the entire kingpin steering system close to the steering knuckle (clave), reducing the lever arm, lowering the bending moment, alleviating the clave load, and improving the durability of the clave; 4. The dual-rotor system of the present invention reduces mechanical connections, lowers inertia and friction, has a faster response speed and better dynamic performance; reduces the corresponding risk of mechanical failure and improves system reliability.

[0020] 5. The dual-rotor system of the present invention is a coaxial structure, in which the kingpin axis, motor output axis, and steering power system output axis coincide with each other, which has significant advantages in terms of simplified structure, improved efficiency, reduced vibration, enhanced rigidity, convenient installation and maintenance, improved precision, space saving, and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the kingpin steering device of the present invention; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 Schematic diagram of the installation of the kingpin steering device and the suspension fork arm of the present invention; Figure 4 for Figure 3 sectional view of . DETAILED DESCRIPTION

[0022] See also Figures 1 to 4A dual-rotor motor kingpin steering device for a wheel hub drive angle module includes a wheel hub 1, a drive motor 2 integrated inside the wheel hub 1, a housing of the drive motor 2 fixedly connected to a steering knuckle 3, a kingpin steering device 4 fixedly provided on the steering knuckle 3, the kingpin steering device 4 includes a housing 41, a dual-rotor motor 5 and a planetary reduction mechanism 6 are provided in the housing 41, the inner rotor shaft of the inner rotor 51 of the dual-rotor motor 5 is connected to the sun gear input shaft 61 of the planetary reduction mechanism 6 through a first clutch, the outer rotor shaft of the outer rotor 52 is connected to the planetary carrier input shaft of the planetary reduction mechanism 6 through a second clutch, and the output shaft 7 of the planetary reduction mechanism 6 includes a plurality of housings. The first output shaft 71, the second output shaft 72, and the output flange 73 are hollow. The first output shaft 71 is inserted into the inner hole of one end of the second output shaft 72, forming an interference fit or keyed fit. The other end of the second output shaft 72 is provided with a flange. Both the flange and the output flange 73 are provided with multiple bolt holes. The flange and the output flange 73 are secured to the steering knuckle 3 by bolts. The present invention utilizes this multi-section shaft connection to improve the strength of the output shaft. If a single shaft is used for direct output, the torque generated during operation requires exceptional strength to prevent the output shaft from breaking. An output shaft protective housing 10 is provided on the outside of the output shaft 7 to protect it. A bearing 11 is housed within the output shaft protective housing 10 to support the second output shaft 72. The output shaft protective housing 10 is bolted to the housing 41 of the kingpin steering device 4. Pin holes are provided on both sides of the suspension fork arm 8. The suspension fork arm 8 is rotatably engaged with the kingpin steering device 4 via a pin 81. A suspension shock absorber 9 is connected to the suspension fork arm 8. The inner rotor shaft, outer rotor shaft, sun gear input shaft 61, and output shaft 7 are coaxially arranged. This coaxial arrangement of the inner rotor shaft, outer rotor shaft, sun gear input shaft 61, and output shaft 7 allows the kingpin axis, motor output axis, and kingpin steering device output axis to coincide. This avoids additional vibration and noise caused by axis misalignment, resulting in smoother and quieter system operation. It also reduces additional stress caused by axis misalignment, enhances system rigidity, and extends service life. The coincidence of the axes simplifies the installation and alignment process, reduces installation difficulty, and facilitates subsequent maintenance and repair. It also reduces transmission errors and improves steering accuracy.

[0023] The kingpin steering system of the present invention incorporates a dual-rotor motor. This motor comprises a fixed stator 53 with inner and outer windings, and two independent rotors: an inner rotor 51 and an outer rotor 52. Electromagnetic induction between the inner winding and the inner rotor 51 generates electromagnetic force, driving the inner rotor 51 to rotate. Electromagnetic induction between the outer winding and the outer rotor 52 also generates electromagnetic force, driving the outer rotor 52 to rotate. The inner and outer rotors 51 and 52 can operate independently or in conjunction. The inner rotor 51 is the constantly operating rotor. Normally, it engages the sun gear input shaft via the first clutch, enabling it to provide steering assistance. The outer rotor 52 serves as a backup power source. In non-fault conditions and when additional power assistance is not required, the second clutch remains disengaged. When the vehicle requires greater steering assistance, such as at low speeds, under high ground damping, or on uneven roads, the system increases the steering assistance output to enhance steering ease. At this point, the outer rotor engages via the second clutch, and the inner and outer rotors work together to provide greater torque output. The status of the first and second clutches is monitored in real time by the vehicle control system, and the vehicle automatically switches the working mode of the inner and outer rotors according to the working conditions.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A dual-rotor motor kingpin steering device for a wheel hub drive angle module, comprising a wheel hub (1), a drive motor (2) integrated inside the wheel hub (1), a housing of the drive motor (2) fixedly connected to a steering knuckle (3), and characterized in that: A kingpin steering device (4) is fixedly arranged on the steering knuckle (3), and the kingpin steering device (4) includes a housing (41). A dual-rotor motor (5) and a planetary reduction mechanism (6) are arranged in the housing (41). The inner rotor shaft of the inner rotor (51) of the dual-rotor motor (5) is connected to the sun gear input shaft (61) of the planetary reduction mechanism (6) through a first clutch, and the outer rotor shaft of the outer rotor (52) is connected to the planetary carrier input shaft of the planetary reduction mechanism (6) through a second clutch. The output shaft (7) of the planetary reduction mechanism (6) is fixedly connected to the steering knuckle (3). A suspension fork arm (8) is rotatably engaged with the kingpin steering device (4), and a suspension shock absorber (9) is connected to the suspension fork arm (8).

2. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 1, characterized in that: The inner rotor shaft, outer rotor shaft, sun gear input shaft (61), and output shaft (7) are on the same axis.

3. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 1, characterized in that: Pin holes are provided on both sides of the suspension fork arm (8), and the suspension fork arm (8) is connected to the kingpin steering device (4) via a pin (81), so that the suspension fork arm (8) rotates around the pin (81).

4. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 1, characterized in that: The output shaft (7) of the planetary reduction mechanism (6) of the kingpin steering device (4) and the steering knuckle (3) are connected and fixed via a plurality of bolts.

5. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 4, characterized in that: The output shaft (7) includes a first output shaft (71), a second output shaft (72), and an output flange (73). The first output shaft (71) is fixed to one end of the second output shaft (72). The other end of the second output shaft (72) is provided with a flange. The flange and the output flange (73) are both provided with a plurality of bolt holes. The flange and the output flange (73), and the output flange (73) and the steering knuckle (3) are fixed by bolts.

6. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 5, characterized in that: The second output shaft (72) is a hollow shaft, and the first output shaft (71) is inserted into the inner hole of one end of the second output shaft (72) to form an interference fit.

7. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 5, characterized in that: The second output shaft (72) is a hollow shaft, and the first output shaft (71) is inserted into the inner hole of one end of the second output shaft (72) to form a key fit.

8. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 5, characterized in that: An output shaft protection housing (10) is provided outside the output shaft (7) for protecting the output shaft (7).

9. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 8, characterized in that: A bearing (11) is provided in the output shaft protection housing (10) for supporting the second output shaft (72).

10. The dual-rotor motor kingpin steering device for a hub drive angle module according to claim 8, characterized in that: The output shaft protection housing (10) is connected and fixed to the housing (41) of the kingpin steering device (4) via bolts.

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