Drive-by-wire chassis angle module wheel edge driving and braking device

Abstract

The utility model relates to the technical field of drive-by-wire chassis, in particular to a drive-by-wire chassis angle module wheel edge driving and braking device. Comprising a driving mechanism and a braking mechanism, the driving mechanism comprises a driving motor, an adapter flange, an input end cover, a planetary reducer, a hub bearing and a steering knuckle, the braking mechanism comprises a brake disc, a brake cylinder, a brake cylinder mounting plate and an electromagnetic band-type brake, the driving motor is connected with the adapter flange, and the adapter flange is fixed to the steering knuckle through the input end cover. The input end cover is connected with the planetary reducer, an output shaft of the driving motor is meshed with the planetary reducer, the planetary reducer is matched with an inner cavity of the steering knuckle and fixed to the inner cavity of the steering knuckle, and the hub bearing is arranged on one side of the steering knuckle and fixedly connected with the steering knuckle. The utility model has the positive effects that the vehicle is more stable when running under complex road conditions, and the operation stability of the vehicle is improved.

Description

Technical Field

[0001] This utility model relates to the field of drive-by-wire chassis technology, and in particular to a drive-by-wire chassis corner module wheel-side drive braking device. Background Technology

[0002] The corner module originates from the automotive industry's urgent need for highly integrated and intelligent chassis systems. With the continuous advancement of autonomous driving technology, chassis systems are evolving towards multi-functional integration and flexible control. As an innovative chassis component, the corner module integrates multiple functions such as drive, steering, braking, and suspension, connecting to the vehicle's electronic systems through standard interfaces, enabling adaptation to chassis with different wheelbases and track widths. This design not only simplifies the chassis structure and reduces weight and cost but also significantly improves the vehicle's economy, safety, and handling. The application of corner modules allows autonomous vehicles to more flexibly cope with complex and changing driving environments, injecting new vitality into the intelligent development of the automotive industry.

[0003] Existing drive-by-wire chassis corner modules have significant design and functional flaws, primarily in the following aspects: 1. Traditional drive-by-wire chassis corner modules use hub motors in their drive mechanisms, bypassing planetary reduction gears, resulting in low output torque. 2. Traditional wheel-side drive mechanisms employ separate designs for the steering knuckle and planetary reducer, with only a simple connection and fixation. This results in a large lateral dimension, significantly increasing the space occupied by the suspension during overall assembly of the corner module. This prevents the suspension's leverage ratio from being maximized, negatively impacting vehicle stability under complex road conditions. Utility Model Content

[0004] The purpose of this invention is to provide a drive-by-wire chassis corner module wheel-side braking device, so as to achieve high torque output driving power and the stability of the vehicle when driving in complex road conditions.

[0005] This utility model provides a drive-by-wire chassis corner module wheel-side drive braking device, characterized in that it includes a drive mechanism and a braking mechanism. The drive mechanism includes a drive motor, an adapter flange, an input end cover, a planetary reducer, a wheel hub bearing, and a steering knuckle. The braking mechanism includes a brake disc, a brake caliper, a brake caliper mounting plate, and an electromagnetic brake. The drive motor is connected to the adapter flange, which is fixed to the steering knuckle via the input end cover. The input end cover is connected to the planetary reducer, and the output shaft of the drive motor meshes with the planetary reducer. The planetary reducer is adapted to and fixed to the inner cavity of the steering knuckle. A hub bearing is installed on one side, with one end of the hub bearing connected and fixed to the steering knuckle and the other end connected and fixed to the brake disc. The hub bearing is connected to and meshes with the output shaft of the planetary reducer. The output shaft of the planetary reducer passes through the steering knuckle and the hub bearing, and the hub bearing and the output shaft of the planetary reducer are locked at the outer extension end by a half-shaft nut. The brake caliper mounting plate is fixed on the steering knuckle, and the brake caliper is fixed on the brake caliper mounting plate. The brake disc is installed between the hub bearing and the tire, and it mates with the friction pad of the brake caliper. The electromagnetic brake is installed at the tail end of the drive motor.

[0006] Furthermore, a skeleton oil seal is embedded in the center stop of the input end cover.

[0007] Furthermore, the steering knuckle includes a frame connecting end and a cylinder connecting end. The frame connecting end is connected to the input end cover, and the cylinder connecting end is connected to the planetary reducer and the wheel hub bearing. A reinforcing rib is provided between the frame connecting end and the cylinder connecting end.

[0008] Furthermore, the input end cover and the frame connection end of the steering knuckle are fixed by surface contact.

[0009] Furthermore, the inner contact surface of the brake caliper mounting plate that connects to the cylinder connection end of the steering knuckle is adapted to the curvature setting of the cylinder connection end.

[0010] Furthermore, the adapter flange is provided with a circular groove.

[0011] Furthermore, the output shaft of the planetary reducer is multi-stage stepped. Along the output direction of the planetary reducer, the frustum connecting end of the output shaft of the planetary reducer forms a surface contact with the hub bearing and is tightly pressed. The spline connecting end of the output shaft of the planetary reducer meshes with the hub bearing. The external threaded connecting end of the output shaft of the planetary reducer passes through the steering knuckle and the hub bearing. The hub bearing and the output shaft of the planetary reducer are locked together by the half-shaft nut.

[0012] This invention provides a drive-by-wire chassis corner module wheel-side drive braking device. It utilizes a drive motor to output torque, which is then reduced and amplified by a planetary reducer. The output shaft of the planetary reducer inputs the torque to the wheel hub bearing, thereby driving the tire to rotate. This device achieves high torque output and, by selecting the planetary reducer's speed ratio, meets the driving speed requirements of the drive-by-wire chassis, ensuring vehicle movement even on complex road surfaces. The small lateral dimension of the drive mechanism allows for a more compact overall structure when arranging and connecting the shock absorbers, and significantly increases the leverage ratio of the suspension mechanism. In summary, this invention effectively improves vehicle stability and handling stability during operation on complex road conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the drive mechanism of this utility model;

[0015] Figure 3 This is a schematic diagram of the braking mechanism of this utility model;

[0016] Figure 4 This is a schematic diagram of the steering knuckle structure of this utility model from a frontal oblique view.

[0017] Figure 5 This is a schematic diagram of the rear oblique view structure of the steering knuckle of this utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the adapter flange of this utility model;

[0019] Figure 7 This is a cross-sectional view of the drive mechanism of this utility model.

[0020] Figure 8 This is a partial schematic diagram showing the output direction connection relationship of the planetary reducer of this utility model;

[0021] Figure 9 This is a schematic diagram of an application example of this utility model. Detailed Implementation

[0022] like Figure 1-9 As shown, the drive and braking device for a drive-by-wire chassis wheel-side drive angle module provided by this utility model includes a drive mechanism 1 and a braking mechanism 2. The drive mechanism 1 includes a drive motor 101, an adapter flange 102, an input end cover 103, a planetary reducer 104, a wheel hub bearing 105, and a steering knuckle 107. The braking mechanism 2 includes a brake disc 201, a brake caliper 202, a brake caliper mounting plate 203, and an electromagnetic brake 204, with the specific connection relationships as follows.

[0023] The steering knuckle includes a frame connection end and a cylinder connection end. The drive motor 101 and the adapter flange 102 are fixed together by bolts. The input end cover 103 and the frame connection end of the steering knuckle 107 form a surface contact. The adapter flange 102 is fixed together with the steering knuckle 107 through the input end cover 103 and the bolts. In this embodiment, the adapter flange is provided with a circular groove C. The circular groove C of the adapter flange is used to sink into the head of the fixing bolt of the planetary reducer 104 connected to the input end cover 103. In addition, a skeleton oil seal A1 is embedded in the center stop of the input end cover 103. The input end cover 103 is fixed to the planetary reducer 104 by bolts. The output shaft of the drive motor 101 meshes with the planetary reducer 104. The planetary reducer 104 is adapted to and fixed to the inner cavity of the cylinder connection end of the steering knuckle 107. A hub bearing 105 is provided on one side of the steering knuckle 107. One end of the hub bearing 105 is fixed to the cylinder connection end of the steering knuckle 107, and the other end of the hub bearing 105 is connected and fixed to the brake disc 201. The output shaft of the planetary reducer is multi-stage stepped. Along the output direction of the planetary reducer 104, the frustum-shaped connecting end B1 of the output shaft of the planetary reducer 104 forms a surface contact with the wheel hub bearing 105 and is tightly pressed together. The spline connecting end B2 of the output shaft of the planetary reducer 104 meshes with the wheel hub bearing 105. After the output shaft of the planetary reducer 104 passes through the steering knuckle 107 and the wheel hub bearing 105, the wheel hub bearing 105 and the output shaft of the planetary reducer 104 are locked together by the half-shaft nut 106 at the outwardly extending external threaded connecting end B3 to ensure concentricity and prevent damage to the wheel hub bearing 105 during vehicle operation. The brake caliper mounting plate 203 is welded to the outer surface of the cylindrical connecting end of the steering knuckle 107. To enhance the stability of the device, a reinforcing rib is provided between the frame connecting end and the cylindrical connecting end. The inner contact surface of the brake caliper mounting plate 203 and the steering knuckle is adapted to the curvature of the cylindrical end of the steering knuckle. The brake caliper 202 is fixed on the brake caliper mounting plate 203. The brake disc 201 is installed between the wheel hub bearing 105 and the tire, and mates with the friction pads of the brake caliper 202. During installation, ensure that the brake disc 201 is centered at the clamping end of the brake caliper 202 to prevent uneven wear of the friction pads. The electromagnetic brake 204 is installed at the tail end of the drive motor 101, specifically secured with bolts, and is an electromagnetic brake with a manual switch. When using this device, the wiring harness of the electromagnetic brake 204 is connected to the vehicle's wiring harness, and the brake caliper 202 is connected to the drive-by-wire brakes of the drive-by-wire chassis via oil pipes.

[0024] This utility model uses a wheel-side drive motor 101 and a planetary reducer 104, which can achieve high torque output at the wheel side to cope with complex road surfaces in different situations. Figure 9As shown, in the application embodiment of this device, the existing steering mechanism 3 and suspension mechanism 4 can be adapted through the frame connection end of the steering knuckle to assemble a wheel corner module for use in a drive-by-wire chassis. The aforementioned steering mechanism 3 and suspension mechanism 4 are prior art, so they will not be described in detail here. The steering knuckle 107 of this device serves as the output end cover of the planetary reducer 104, realizing the integration of the steering knuckle 107 and the output end cover of the planetary reducer. This can effectively reduce the lateral dimension of the corner module, improve the utilization rate of the suspension space, and also adjust the installation position of the shock absorber in the suspension mechanism, making its connection with the drive side more compact, thus greatly increasing the leverage ratio of the suspension mechanism. This makes the vehicle more stable when running on complex road conditions, greatly improving the vehicle's handling stability. In addition, in specific embodiments of this utility model, planetary reducers 104 with different speed ratios are selected to meet the specific needs of different vehicle speeds and climbing abilities.

[0025] When this device is in use, the drive motor 101 outputs torque, which is then reduced and increased by the planetary reducer 104. The output shaft of the planetary reducer 104 inputs the torque to the wheel hub bearing 105, thereby driving the tires. This allows for high torque output. By selecting different speed ratios for the planetary reducer 104, the device can adapt to the travel speed of the drive-by-wire chassis, ensuring that the vehicle can still move on complex road surfaces. During driving, the drive-by-wire chassis sends a braking command to its brake-by-wire system, controlling the brake caliper 202 to tighten the friction pads and lock them against the brake disc 201, gradually reducing the vehicle speed until it stops. To park the drive-by-wire chassis while it is stopped, the electromagnetic brake 204 is activated to lock the drive motor 101, achieving the parking function. The electromagnetic brake 204 has a manual switch at its end, allowing for parking and release functions without the controller.

[0026] This invention enables better drive and braking control. The following description of the drive and braking working principle of this invention will further illustrate this invention.

[0027] Drive control principle. The drive motor 101 outputs torque, which drives the internal gear set of the planetary reducer 104 to rotate, thereby reducing the speed and increasing the torque of the drive motor 101. The planetary reducer 104 drives the wheel hub bearing 105 to rotate. The brake disc 201 and the tire are fixed together with the wheel hub bearing 105 and rotate together with the wheel hub bearing 105.

[0028] Braking control principle. The brake disc 201 rotates as the vehicle moves. When the vehicle receives a braking signal during operation, the brake-by-wire controls the brake caliper 202 to grip the brake disc 201, gradually reducing its speed until it stops, thus achieving the purpose of braking. When the vehicle is parked, the electromagnetic brake 204 starts to work, locking the drive motor 101 so that its output shaft cannot rotate. The electromagnetic brake 204 has a manual switch at its end, which can be used to park and release the brake.

Claims

1. A drive-by-wire chassis corner module wheel-side braking device, characterized in that, The system includes a drive mechanism and a braking mechanism. The drive mechanism includes a drive motor, an adapter flange, an input end cover, a planetary reducer, a wheel hub bearing, and a steering knuckle. The braking mechanism includes a brake disc, a brake caliper, a brake caliper mounting plate, and an electromagnetic brake. The drive motor is connected to the adapter flange, which is fixed to the steering knuckle via the input end cover. The input end cover is connected to the planetary reducer, and the output shaft of the drive motor meshes with the planetary reducer. The planetary reducer is fitted to and fixed to the inner cavity of the steering knuckle. A wheel hub bearing is located on one side of the steering knuckle, with one end connected and fixed to the steering knuckle and the other end connected and fixed to the brake disc. The wheel hub bearing is connected to and meshes with the output shaft of the planetary reducer, which passes through the steering knuckle and the wheel hub bearing. The wheel hub bearing and the output shaft of the planetary reducer are locked together via a half-shaft nut at the outer extension end. The brake caliper mounting plate is fixed to the steering knuckle, and the brake caliper is fixed to the brake caliper mounting plate. The brake disc is mounted between the wheel hub bearing and the tire, engaging with the friction pads of the brake caliper. The electromagnetic brake is mounted at the tail end of the drive motor.

2. The drive-by-wire chassis corner module wheel-side drive braking device according to claim 1, characterized in that, An embedded skeleton oil seal is placed at the center stop of the input end cover.

3. The drive-by-wire chassis corner module wheel-side drive braking device according to claim 2, characterized in that, The steering knuckle includes a frame connecting end and a cylinder connecting end. The frame connecting end is connected to the input end cover, and the cylinder connecting end is connected to the planetary reducer and the wheel hub bearing. A reinforcing rib is provided between the frame connecting end and the cylinder connecting end.

4. The drive-by-wire chassis corner module wheel-side drive braking device according to claim 3, characterized in that, The input end cover and the frame connection end of the steering knuckle are fixed by surface contact.

5. The drive-by-wire chassis corner module wheel-side drive braking device according to claim 4, characterized in that, The inner contact surface of the brake caliper mounting plate that connects to the cylinder connection end of the steering knuckle is adapted to the curvature setting of the cylinder connection end.

6. The drive-by-wire chassis corner module wheel-side drive braking device according to claim 5, characterized in that, The adapter flange has a circular groove.

7. The drive-by-wire chassis corner module wheel-side drive braking device according to claim 6, characterized in that, The output shaft of the planetary reducer is multi-stage stepped. Along the output direction of the planetary reducer, the frustum connecting end of the output shaft of the planetary reducer forms a surface contact with the hub bearing and is tightly pressed. The spline connecting end of the output shaft of the planetary reducer meshes with the hub bearing. The external threaded connecting end of the output shaft of the planetary reducer passes through the steering knuckle and the hub bearing. The hub bearing and the output shaft of the planetary reducer are locked together by the half-shaft nut.

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