Electric active stabilizer bar with a small tooth difference gear train

Abstract

The application discloses a kind of electric active stabilizer bar with few tooth difference gear train, it is related to vehicle stabilizer bar technical field.The application includes actuator, left stabilizer bar and right stabilizer bar, actuator includes power part, reducer part, damping part, shell, power part, reducer part, damping part are in shell, power part is brushless DC motor, provides power for this device, reducer part is formed by fixed gear ring, rotating gear ring, double gear and planet carrier, damping part is formed by damping medium and damping device, actuator is between left stabilizer bar and right stabilizer bar, left stabilizer bar is connected with the end cover of actuator by screw, right stabilizer bar is inserted into shell and is connected with the output shaft of actuator, compared with traditional motor type active stabilizer bar, the application has the advantages of compact structure, simple process, high stability, large transmission ratio, easy installation and the like.

Description

Technical Field

[0001] This invention belongs to the field of vehicle stabilizer bar technology, and in particular relates to an electric active stabilizer bar that uses a low-tooth differential gear train. Background Technology

[0002] Currently, the suspension systems of ordinary passenger cars are usually equipped with passive stabilizer bars. These stabilizer bars have a simple structure and can reduce body roll to a certain extent. However, they cannot adjust the suspension roll angle in real time when cornering at high speeds, which cannot meet the requirements for ride comfort and handling stability. Excessive roll angle can also lead to vehicle rollover and traffic accidents. Active anti-roll control systems can quickly apply anti-roll torque to the vehicle when it tends to roll, forcing the vehicle to remain stable and preventing or reducing the body roll angle and tire slippage.

[0003] Compared to traditional stabilizer bars, active stabilizer bars are of great significance in improving vehicle stability and safety, enhancing passenger comfort, and reducing vehicle maintenance costs.

[0004] To address this, we designed an electrically powered active stabilizer bar that uses a low-tooth differential gear train. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to an electrically operated active stabilizer bar employing a low-tooth differential gear train, comprising a left stabilizer bar, a right stabilizer bar, and an actuator. The actuator has a rear end cover at its left end. The left stabilizer bar is connected to the rear end cover of the actuator by screws, and the right stabilizer bar is connected to the output shaft of the actuator by bolts. The actuator includes a power unit, a reducer unit, a damping unit, a limiting device, and a housing. The power unit, reducer unit, and damping unit are all housed inside the housing, and the limiting device is located on the right end face of the housing.

[0007] Furthermore, the power unit includes a brushless DC motor, which is fixedly installed inside the housing, and a first bearing is installed on the output shaft of the brushless DC motor.

[0008] Furthermore, the reducer consists of a planetary carrier, a fixed gear ring, a double gear, a second bearing, and a rotating gear ring. The outer ring of the fixed gear ring is fixed to the outer casing. The inner ring of the fixed gear ring meshes with the inner gear on one side of the double gear. The rotating gear ring meshes with the inner gear on the other side of the double gear. The planetary carrier is interference-fitted with the inner ring of the second bearing, and the double gear is interference-fitted with the outer ring of the second bearing.

[0009] Furthermore, the damping part consists of an upper end cover, a lower end cover, and a damper. The damper is disposed between the upper end cover and the lower end cover, and sealing rings are symmetrically arranged on both sides of the damper, which cooperate with the upper end cover and the lower end cover respectively. The upper end cover and the lower end cover are filled with damping material, and the three sets of dampers are arranged in a 120° ring.

[0010] Furthermore, the damper consists of a damping brush head, a damper housing, a first connecting bolt, and a second connecting bolt. The damping brush head is inserted into the damper housing, and a tension spring is provided inside the damper housing. The end of the damping brush head is fixedly connected to one end of the tension spring by the first connecting bolt, and the other end of the tension spring is fixed in a hole in the damper housing by the second connecting bolt.

[0011] Furthermore, a wiring harness is provided on the left side inside the housing, and an encoder and a torque sensor are connected to the left end of the brushless DC motor. The wiring harness passes through the encoder and the torque sensor and is fixed on the rear end cover.

[0012] Furthermore, a rubber washer is provided on the right side inside the housing. The rubber washer is connected to the rotating gear ring and the damping part. A third bearing is provided on the right side of the damping part. The inner ring of the third bearing is interference-fitted with the output shaft on the rotating gear ring.

[0013] Furthermore, the limiting device consists of a front cover, a limiting buckle, and a coupling. The front cover is connected to the outer shell, the outer ring of the third bearing is interference-fitted with the front cover, one end of the coupling is splined with the output shaft on the rotating gear ring, and the other end is connected to the right stabilizer bar by bolts. A gear ring is welded on the front cover, and the teeth on the limiting buckle mesh with the teeth on the gear ring.

[0014] The present invention has the following beneficial effects:

[0015] Compared with existing technologies, the significant advantages of this invention are:

[0016] 1. The process is simple, the structure is compact, and the cost is low. Compared with the traditional three-stage planetary reducer, the reducer part of this invention only requires a fixed gear ring, a rotating gear ring, a double gear, a second bearing, and a planet carrier. The structure is simpler and more compact, fewer parts are required, the manufacturing cost is reduced, there is no complicated fit, and the assembly is more convenient.

[0017] 2. High stability: The output shaft of the actuator is connected in series with a damping component, which can eliminate the high-frequency jitter of the stabilizer bar during system operation and improve the control performance of the stabilizer bar. At the same time, the damping of the damping component can increase with the increase of the stabilizer bar speed, thereby ensuring that the stabilizer bar can work stably in all speed ranges.

[0018] 3. Large transmission ratio: The use of a planetary gear train with a small tooth difference can provide a large transmission ratio while reducing system complexity. This invention is a two-stage planetary transmission, and the transmission ratio can be multiplied by connecting another stage of planetary transmission in series.

[0019] 4. The limit angle is adjustable. It adopts a simple mechanical structure to limit the rotation angle of the stabilizer bar. The limit angle can be controlled by installation, which improves the application range of the stabilizer bar.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a motor-driven active stabilizer bar using a low-tooth differential gear train according to the present invention;

[0023] Figure 2 This is an internal structural diagram of a motor-driven active stabilizer bar using a low-tooth differential gear train according to the present invention.

[0024] Figure 3 This is an exploded view of a motor-driven active stabilizer bar using a low-tooth differential gear train according to the present invention;

[0025] Figure 4 This is a half-sectional view of the reducer section in this invention;

[0026] Figure 5 This is an internal structural diagram of the damping part in this invention;

[0027] Figure 6 This is a half-sectional view of the damping part in this invention;

[0028] Figure 7 This is a schematic diagram of the damper structure in this invention;

[0029] Figure 8 This is a half-sectional view of the damper in this invention;

[0030] Figure 9 This is a structural diagram of the limiting device in this invention;

[0031] Figure 10 This is a simplified structural diagram of the reducer section in this invention;

[0032] Figure 11This is an equivalent structural substitution diagram of the reducer section in this invention.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Left stabilizer bar; 2. Actuator; 3. Right stabilizer bar; 4. Rear end cover; 5. Wiring harness; 6. Torque sensor; 7. Encoder; 8. Housing; 9. Brushless DC motor; 10. First bearing; 11. Planetary carrier; 12. Fixed gear ring; 13. Double gear; 14. Second bearing; 15. Rotating gear ring; 16. Damping part; 17. Rubber washer; 18. Limiting buckle; 19. Third bearing; 20. Coupling; 21. Front end cover; 16-1. Upper end cover; 16-2. Damping material; 16-3. Sealing ring; 16-4. Damper; 16-4-1. Damping brush head; 16-4-2. Damper housing; 16-4-3. First connecting bolt; 16-4-4. Tension spring; 16-4-5. Second connecting bolt. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "upper," "middle," "outer," "inner," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0037] Please see Figure 1 As shown, the present invention is an electric active stabilizer bar using a low-tooth differential gear train, including a left stabilizer bar 1, a right stabilizer bar 3, and an actuator 2. The actuator 2 has a rear end cover 4 at its left end. The left stabilizer bar 1 and the rear end cover 4 of the actuator 2 are connected by screws. The right stabilizer bar 3 and the output shaft of the actuator 2 are connected by bolts. The actuator 2 includes a power part, a reducer part, a damping part 16, a limiting device, and a housing 8. The power part, the reducer part, and the damping part 16 are all located inside the housing 8. The limiting device is located on the right end face of the housing 8.

[0038] Please see Figures 2-3 As shown, the power unit includes a brushless DC motor 9, which is fixedly installed inside the housing 8, and a first bearing 10 is installed on the output shaft of the brushless DC motor 9.

[0039] Please see Figure 4 As shown, the reducer consists of a planetary carrier 11, a fixed gear ring 12, a double gear 13, a second bearing 14, and a rotating gear ring 15. The outer ring of the fixed gear ring 12 is fixed to the housing 8. The inner ring of the fixed gear ring 12 meshes with the inner gear on one side of the double gear 13. The rotating gear ring 15 meshes with the inner gear on the other side of the double gear 13. The planetary carrier 11 is interference-fitted with the inner ring of the second bearing 14, and the double gear 13 is interference-fitted with the outer ring of the second bearing 14.

[0040] Please see Figures 5-8 As shown, the damping part 16 consists of an upper end cover 16-1, a lower end cover 16-6, and a damper 16-4. The damper 16-4 is positioned between the upper end cover 16-1 and the lower end cover 16-6, and sealing rings 16-3 are symmetrically arranged on both sides of the damper 16-4, which cooperate with the upper end cover 16-1 and the lower end cover 16-6 respectively. The upper end cover 16-1 and the lower end cover 16-6 are filled with damping material 16-2. The three sets of dampers 16-4 are arranged in a 120° annular pattern. The damper 16-4 consists of a damping brush head 16-4-1 and a damper shell. The damper housing 16-4-2 is composed of a body 16-4-2, a first connecting bolt 16-4-3, and a second connecting bolt 16-4-5. The damping brush head 16-4-1 is inserted into the damper housing 16-4-2. A tension spring 16-4-4 is installed inside the damper housing 16-4-2. The end of the damping brush head 16-4-1 is fixedly connected to one end of the tension spring 16-4-4 by the first connecting bolt 16-4-3. The other end of the tension spring 16-4-4 is fixed in the hole of the damper housing 16-4-2 by the second connecting bolt 16-4-5.

[0041] Please see Figures 2-3 As shown, a wiring harness 5 is installed on the left side inside the housing 8. An encoder 7 and a torque sensor 6 are connected to the left end of the brushless DC motor 9. The wiring harness 5 passes through the encoder 7 and the torque sensor 6 and is fixed to the rear end cover 4. A rubber washer 17 is installed on the right side inside the housing 8. The rubber washer 17 is connected to the rotating gear ring 15 and the damping part 16. A third bearing 19 is installed on the right side of the damping part 16. The inner ring of the third bearing 19 is interference-fitted with the output shaft on the rotating gear ring 15. The limiting device consists of a front end cover 21, a limiting buckle 18, and a coupling 20. The front cover 21 is connected to the outer shell 8. The outer ring of the third bearing 19 is interference-fitted with the front cover 21. One end of the coupling 20 is splined with the output shaft on the rotating gear ring 15, and the other end is connected to the right stabilizer bar 3 by bolts. A gear ring is welded on the front cover 21. The teeth on the limit buckle 18 mesh with the teeth on the gear ring. The meshing of the limit buckle 18 with the gear ring can limit the rotation of the protrusion on the coupling 20. At the same time, the limit buckle 18 facilitates the disassembly and installation of the stabilizer bar and can limit the clockwise and counterclockwise rotation angle of the stabilizer bar.

[0042] Example:

[0043] Power is transmitted to the planetary carrier 11 via a brushless DC motor 9. The planetary carrier 11 serves as the power input for the low-tooth-difference planetary reducer. It drives the double gear 13, which meshes with both the fixed gear ring 12 and the rotating gear ring 15, while simultaneously revolving. The output is then decelerated via the rotating gear ring 15. A damping section 16 is connected to the output shaft. When the output shaft rotates, it drives the damper 16-4 to rotate. The damping section 16 is sealed with damping material 16-2, which impedes the rotation of the damper 16-4. When the output shaft speed increases, the damping brush head 16-4-1 extends along the damper housing 16-4-2 due to inertia. One end of the tension spring 16-4-4 is fixed to the damping brush head 16-4-1, and the other end... Fixed to the damper housing 16-4-2, the tension spring 16-4-4 stretches according to the rotational speed. As the rotational speed increases, the extension of the tension spring 16-4-4 increases, and the extension length of the damping brush head 16-4-1 increases. The contact area between the side of the damping brush head 16-4-1 and the damping material 16-2 increases, resulting in a larger system damping coefficient. Thus, the damping of the entire system can be automatically adjusted according to the rotational speed of the stabilizer bar. The output shaft is finally connected to the right stabilizer bar 3 through the coupling 20 for power output. When the vehicle rolls, the electric stabilizer bar can adjust its own stabilizer bar stiffness to improve roll stability. It has the advantages of compact structure, simple process, high stability, large transmission ratio, and convenient installation.

[0044] The electric stabilizer bar in this invention has high control precision and can respond to changes in the vehicle in a timely manner. It can recover vibration energy. Compared with the hydraulic stabilizer bar, the electric stabilizer bar suspension system has fewer components and mechanical parts, simpler system configuration, lower sealing requirements, higher energy efficiency, no waste liquid discharge, and is more environmentally friendly. It is also easier to maintain.

[0045] Among them, such as Figure 10 As shown, the reducer section is a planetary reducer with a small tooth difference.

[0046] Assuming the planet carrier H is fixed

[0047]

[0048] Where w4 = 0

[0049]

[0050] Based on the above formula, we can summarize as follows:

[0051]

[0052] If designed as a single-tooth differential gear train, then let z1 = z3 = n, z2 = n-1, z4 = n+1 and substitute them into the equation. From the middle

[0053] i H1 =n 2

[0054] If designed as a two-tooth differential gear train, then let z1 = z3 = n, z2 = n-2, z4 = n+2 and substitute them into the equation. From the middle

[0055] i H1 =n 2 / 4

[0056] Choosing n=14 and n=28 will satisfy the requirement of a transmission ratio of 196;

[0057] Furthermore, the reducer design is not limited to the low-tooth-difference gear train used in this invention; it is also applicable to other types of low-tooth-difference gear trains, such as... Figure 11 As shown.

[0058] The actuator 2 outputs torque through the right stabilizer bar 3. The planetary carrier 11 is an offset crankshaft. The center distance between the crankshaft and the main shaft is the same as the center distance between the fixed gear ring 12 and the double gear 13.

[0059] The torque output in this invention is moderate and suitable for medium-sized cars and SUVs. By connecting another stage of planetary gears, it can be applied to large buses and large trucks.

[0060] When designing for different vehicle models, the amount of torque that the stabilizer bar needs to withstand varies. Different connection methods can be used for planetary reducers with small tooth difference. For applications with low torque, bearings can be used for transmission, while for applications with high torque, pin connections can be used for transmission.

[0061] It should be further noted that the installation structure, connection method, or setting method of each component in this invention are all common mechanical methods, and any method that can achieve its beneficial effect can be implemented.

[0062] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An electrically operated active stabilizer bar employing a low-tooth differential gear train, comprising a left stabilizer bar (1), a right stabilizer bar (3), and an actuator (2), characterized in that: The actuator (2) has a rear end cover (4) on its left end. The left stabilizer (1) is connected to the rear end cover (4) of the actuator (2) by screws. The right stabilizer (3) is connected to the output shaft of the actuator (2) by bolts. The actuator (2) includes a power part, a reducer part, a damping part (16), a limiting device, and a housing (8). The power part, the reducer part, and the damping part (16) are all located inside the housing (8). The limiting device is located on the right end face of the housing (8). The power part includes a brushless DC motor (9). The brushless DC motor (9) is fixedly installed inside the housing (8). A first bearing (10) is installed on the output shaft of the brushless DC motor (9). The reducer part consists of a planetary carrier (11), a fixed gear ring (12), a double gear (13), a second bearing (14), and a rotating gear ring (15). The outer ring of the fixed gear ring (12) is fixed on the housing (8). The inner ring meshes with the inner gear on one side of the double gear (13), the rotating gear ring (15) meshes with the inner gear on the other side of the double gear (13), the planetary carrier (11) is interference-fitted with the inner ring of the second bearing (14), the double gear (13) is interference-fitted with the outer ring of the second bearing (14), the planetary carrier (11) is fixedly connected to the output shaft of the brushless DC motor (9), forming a power input path; the damping part (16) consists of an upper end cover (16-1) and a lower end cover (16-1). The damper (16-4) consists of an upper end cover (16-1) and a lower end cover (16-6). The damper (16-4) is located between the upper end cover (16-1) and the lower end cover (16-6). A sealing ring (16-3) is symmetrically arranged on both sides of the damper (16-4), which cooperates with the upper end cover (16-1) and the lower end cover (16-6) respectively. The upper end cover (16-1) and the lower end cover (16-6) are filled with damping material (16-2). The three sets of dampers (16-4) are arranged at 120° angles. The damper (16-4) is arranged in a ring. It consists of a damping brush head (16-4-1), a damper housing (16-4-2), a first connecting bolt (16-4-3), and a second connecting bolt (16-4-5). The damping brush head (16-4-1) is inserted into the damper housing (16-4-2). A tension spring (16-4-4) is provided inside the damper housing (16-4-2). The end of the damping brush head (16-4-1) is fixedly connected to one end of the tension spring (16-4-4) by the first connecting bolt (16-4-3). The other end of the tension spring (16-4-4) is fixed in the hole of the damper housing (16-4-2) by the second connecting bolt (16-4-5). The damping part (16) is fixedly connected to the output shaft of the rotating gear ring (15).The limiting device consists of a front cover (21), a limiting buckle (18), and a coupling (20). The front cover (21) is connected to the outer shell (8). The outer ring of the third bearing (19) is interference-fitted with the front cover (21). One end of the coupling (20) is splined with the output shaft on the rotating gear ring (15), and the other end is connected to the right stabilizer bar (3) by bolts. A gear ring is welded onto the front cover (21), and the teeth on the limiting buckle (18) mesh with the teeth on the gear ring.

2. The electrically operated active stabilizer bar with a low-tooth differential gear train according to claim 1, characterized in that: A wire harness (5) is provided on the left side inside the housing (8). An encoder (7) and a torque sensor (6) are connected to the left end of the brushless DC motor (9). The wire harness (5) passes through the encoder (7) and the torque sensor (6) and is fixed on the rear cover (4).

3. The electrically operated active stabilizer bar with a low-tooth differential gear train according to claim 1, characterized in that: A rubber washer (17) is provided on the right side inside the outer casing (8). The rubber washer (17) is connected to the rotating gear ring (15) and the damping part (16). A third bearing (19) is provided on the right side of the damping part (16). The inner ring of the third bearing (19) is interference-fitted with the output shaft on the rotating gear ring (15).

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