Electronic mechanical brake for new energy vehicle and new energy vehicle

Abstract

This application relates to the field of brake technology, and in particular to an electromechanical brake for new energy vehicles and a new energy vehicle. An electromechanical brake for a new energy vehicle includes a motor and a braking assembly. The braking assembly includes a push rod, which has a first section and a second section along its extension direction. The first section is threadedly connected to the rotating shaft of the motor, and a wedge-shaped portion is provided at the end of the second section opposite to the first section. The braking assembly also includes a left roller, a left piston, a right roller, and a right piston. The left and right rollers are distributed on both sides of the push rod, and the left roller is located between the left piston and the wedge-shaped portion. This utility model solves the technical problem existing in the prior art, namely, how to improve the friction mode between the push block and the first and second wedge blocks, and reduce the wear of the push block, the first wedge block, and the second wedge block.

Description

Technical Field

[0001] This application relates to the field of brake technology, and in particular to an electromechanical brake for new energy vehicles and a new energy vehicle. Background Technology

[0002] New energy vehicles have begun to develop towards brake-by-wire. Compared with traditional braking, phase-controlled braking has fewer components and a shorter braking response time, making it more advantageous for electric new energy vehicles. Electromechanical brakes, as key components of braking, are also an inevitable trend for future development.

[0003] An existing electromechanical brake, as disclosed in patent document CN202520841119.5, involves two inclined surfaces at the bottom of the push block sliding into contact with the wedge-shaped contact surfaces of the first and second wedge blocks, thereby converting the vertical power of the motor's rotating shaft into a power that drives the friction plate to move in the horizontal direction.

[0004] However, this sliding contact transmission method causes significant wear on the push block, the first wedge, and the second wedge. As wear increases, the push block, the first wedge, and the second wedge will gradually become thinner, increasing the cost of later maintenance.

[0005] Therefore, in the existing technology, how to improve the friction mode between the pushing block and the first wedge and the second wedge, and reduce the wear of the pushing block, the first wedge and the second wedge, is a technical problem that needs to be solved. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned deficiencies in the prior art by providing a method to improve the friction between the pushing block and the first and second wedge blocks, thereby reducing the wear of the pushing block, the first and second wedge blocks, which is a technical problem that needs to be solved.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] An electromechanical brake for new energy vehicles includes a motor and a braking assembly;

[0009] The braking assembly includes a push rod, which has a first section and a second section along its extension direction. The first section is threadedly connected to the rotating shaft of the motor. The second section has a wedge-shaped part at one end away from the first section. The two sides of the wedge-shaped part are a left inclined surface and a right inclined surface, respectively. In the direction from the first section to the second section, the left inclined surface and the right inclined surface are close to each other. In the direction from the second section to the first section, the left inclined surface and the right inclined surface are far apart from each other.

[0010] The braking assembly also includes a left roller, a left piston, a right roller, and a right piston. The left and right rollers are distributed on both sides of the push rod. The left roller is located between the left piston and the wedge-shaped part. The outer circumferential surface of the left roller makes rolling contact with one end of the left piston and the left inclined surface, respectively. The right roller is located between the right piston and the wedge-shaped part. The outer circumferential surface of the right roller makes rolling contact with one end of the right piston and the right inclined surface, respectively.

[0011] The braking assembly also includes a left friction pad assembly and a right friction pad assembly. The left friction pad assembly is located on the side of the left piston away from the left roller, and the right friction pad assembly is located on the side of the right piston away from the right roller.

[0012] The braking assembly also includes a tension spring, with its two ends connected to the left friction plate assembly and the right friction plate assembly, respectively.

[0013] Furthermore, the braking assembly includes a retainer connected to the push rod, the retainer not obstructing the left and right inclined surfaces, and the retainer being provided with a left mounting hole and a right mounting hole;

[0014] The left roller has a left connecting post at its end, which is inserted into the left mounting hole and rolls in contact with the inner wall of the left mounting hole. The right roller has a right connecting post at its end, which is inserted into the right mounting hole and rolls in contact with the inner wall of the right mounting hole.

[0015] Furthermore, the braking assembly also includes a brake drum and a mounting block, with the mounting block detachably connected to the brake drum;

[0016] The assembly block is provided with a left channel and a right channel; the left piston is axially movable and inserted into the left channel, and the outer circumferential surface of the left piston slides in contact with the inner wall of the left channel; the right piston is axially movable and inserted into the right channel, and the outer circumferential surface of the right piston slides in contact with the inner wall of the right channel.

[0017] Furthermore, a new energy vehicle is proposed, which includes the aforementioned electromechanical brake for new energy vehicles.

[0018] Furthermore, it also includes a main controller, with the motor communicating with the main controller.

[0019] Furthermore, the motor housing includes a first part and a second part, wherein the diameter of the second part is smaller than the diameter of the first part, the first part and the second part are coaxially and integrally connected, and the length of the second part is configured to a first preset length along the axial direction of the motor.

[0020] The axis of the housing and the axis of the braking assembly form a first preset angle.

[0021] Compared with existing technologies, the advantages of this utility model are:

[0022] I. The push rod in this utility model is equivalent to the push block in the prior art, the left piston in this utility model is equivalent to the first wedge in the prior art, and the right piston in this utility model is equivalent to the second wedge in the prior art. Compared with the prior art, this utility model adds a left roller between the push rod and the left piston, and a right roller between the push rod and the right piston. This creates rolling friction between the push rod and the left piston through the left roller, and between the push rod and the right piston through the right roller. Under the same load and the same contact surface material, the coefficient of rolling friction is much smaller than the coefficient of sliding friction, thus effectively reducing the wear of the push rod, left piston, and right piston. Therefore, this utility model solves the technical problem existing in the prior art, namely, how to improve the friction mode between the push block and the first and second wedges, and reduce the wear of the push block, the first wedge, and the second wedge.

[0023] II. When the new energy vehicle of this utility model brakes, the motor rotates, and after the left friction plate assembly, right friction plate assembly and brake drum eliminate contact, the motor current will show a clear inflection point. The main controller system identifies and records this position, compares the angle of motor rotation during this process with the design angle, and compares the actual gap between the left friction plate assembly, right friction plate assembly and brake drum with the design gap, thereby determining whether the actual gap is smaller or larger than the design gap; and compensates for the gap when the motor rotates after the brake is released. If the gap is too small, the main controller controls the motor to increase the rotation angle; if the gap is too large, the main controller controls the motor to decrease the rotation angle to ensure that the gap between the left friction plate assembly, right friction plate assembly and brake drum is constant. This function is also called the bidirectional automatic intelligent gap adjustment function.

[0024] Third, in this utility model, the length of the second part of the housing is configured as a first preset length, and the axis of the housing and the axis of the braking component form a first preset angle. During installation, the vehicle battery pack is completely avoided in the spatial dimension, and mechanical interference can be avoided without reducing the size of the battery pack. This maximizes the chassis battery layout area, improves the vehicle's energy storage capacity and range, and adapts to the integrated design requirements of integrated chassis and skateboard chassis for new energy vehicles. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the electromechanical brake for new energy vehicles in Example 1;

[0026] Figure 2 It is an exploded view of the push rod, left roller, right roller, cage, left piston, and right piston.

[0027] Figure 3 yes Figure 1 Side view.

[0028] The markings in the diagram are: 1. Motor; 2. Brake assembly; 3. Push rod; 4. First section; 5. Second section; 6. Left inclined plane; 7. Right inclined plane; 8. Wedge-shaped part; 9. Left roller; 10. Left piston; 11. Right roller; 12. Right piston; 13. Left friction plate assembly; 14. Right friction plate assembly; 15. Cage; 16. Left mounting hole; 17. Right mounting hole; 18. Left connecting post; 19. Right connecting post; 20. Brake drum; 21. Left channel; 22. Right channel; 23. Assembly block; 24. First part; 25. Second part; 26. Housing; 27. Tension spring. Detailed Implementation

[0029] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length h," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] Example 1

[0031] like Figures 1-2As shown, a preferred embodiment of this utility model proposes an electromechanical brake for a new energy vehicle, which includes a motor 1 and a braking assembly 2. The braking assembly 2 includes a push rod 3, which has a first section 4 and a second section 5 along its extension direction. The first section 4 is threadedly connected to the rotating shaft of the motor 1. A wedge-shaped portion 8 is provided at one end of the second section 5 away from the first section 4. The two sides of the wedge-shaped portion 8 are a left inclined surface 6 and a right inclined surface 7, respectively. From the first section 4 to the second section 5, the left inclined surface 6 and the right inclined surface 7 are close to each other, and from the second section 5 to the first section 4, the left inclined surface 6 and the right inclined surface 7 are far apart from each other. The braking assembly 2 also includes a left roller 9, a left piston 10, a right roller 11, and a right piston 12. The left roller 9 and the right roller 11 are distributed... On both sides of the push rod 3, the left roller 9 is located between the left piston 10 and the wedge-shaped part 8, and the outer circumferential surface of the left roller 9 rolls in contact with one end of the left piston 10 and the left inclined surface 6 respectively. The right roller 11 is located between the right piston 12 and the wedge-shaped part 8, and the outer circumferential surface of the right roller 11 rolls in contact with one end of the right piston 12 and the right inclined surface 7 respectively. The braking assembly 2 also includes a left friction pad assembly 13 and a right friction pad assembly 14. The left friction pad assembly 13 is located on the side of the left piston 10 away from the left roller 9, and the right friction pad assembly 14 is located on the side of the right piston 12 away from the right roller 11. The braking assembly 2 also includes a tension spring 27, and the two ends of the tension spring 27 are connected to the left friction pad assembly 13 and the right friction pad assembly 14 respectively.

[0032] The rotating shaft of motor 1 is used to drive push rod 3 to move vertically. When push rod 3 moves vertically downward, the left inclined surface 6 of push rod 3 pushes the left friction plate assembly 13 to the left through the left roller 9 and the left piston 10. The right inclined surface 7 of push rod 3 pushes the right friction plate assembly 14 to the right through the right roller 11 and the right piston 12. When push rod 3 moves vertically upward, the two ends of tension spring 27 pull the left friction plate assembly 13 and the right friction plate assembly 14 back to their original positions. The left friction plate assembly 13 then drives the left roller 9 to return to its original position by the left piston 10, and the right friction plate assembly 14 then drives the right roller 11 to return to its original position by the right piston 12, which in turn drives the right roller 11 to return to its original position by the right inclined surface 7.

[0033] As mentioned above, the left roller 9 and the right roller 11 are located on both sides of the push rod 3, specifically: as follows: Figures 1-2 As shown, the braking assembly 2 includes a retainer 15, which is connected to the push rod 3. The retainer 15 does not obstruct the left inclined surface 6 and the right inclined surface 7. The retainer 15 is provided with a left mounting hole 16 and a right mounting hole 17. The end of the left roller 9 is provided with a left connecting post 18, which is inserted into the left mounting hole 16 and rolls in contact with the inner wall of the left mounting hole 16. The end of the right roller 11 is provided with a right connecting post 19, which is inserted into the right mounting hole 17 and rolls in contact with the inner wall of the right mounting hole 17.

[0034] To limit the linear movement of the left piston 10 and the right piston 12, this embodiment also includes the following technical solutions: Figures 1-2 As shown, the braking assembly 2 also includes a brake drum 20 and an assembly block 23, which is detachably connected to the brake drum 20. The assembly block 23 is provided with a left channel 21 and a right channel 22. The left piston 10 is axially movable and inserted into the left channel 21, and the outer circumferential surface of the left piston 10 slides in contact with the inner wall of the left channel 21. The right piston 12 is axially movable and inserted into the right channel 22, and the outer circumferential surface of the right piston 12 slides in contact with the inner wall of the right channel 22.

[0035] In use, because the left inclined surface 6 and the right inclined surface 7 of the two sides of the wedge-shaped part 8 are in rolling contact with the left roller 9 and the right roller 11 respectively, and are restricted by the left roller 9 and the right roller 11, the push rod 3 will not rotate around its own axis. Therefore, during the rotation of the rotating shaft of the motor 1, the rotating shaft of the motor 1 is screwed into the first section 4 of the push rod 3. This causes the rotating motion of the rotating shaft of the motor 1 to be converted into the linear motion of the push rod 3 in the vertical direction through the thread between the rotating shaft of the motor 1 and the push rod 3. The push rod 3 moves vertically downwards, and the left inclined surface 6 of the push rod 3 passes through the left roller 9 and the left piston 10. The left friction pad assembly 13 is pushed to the left, and the outer circle of the left friction pad assembly 13 approaches and fits against the inner circle of the brake drum 20. The right inclined surface 7 of the push rod 3 pushes the right friction pad assembly 14 to the right through the right roller 11 and the right piston 12. The outer circle of the right friction pad assembly 14 approaches and fits against the inner circle of the brake drum 20, generating braking force, and the vehicle decelerates or stops. The push rod 3 moves vertically upward, and the two ends of the tension spring 27 pull the left friction pad assembly 13 and the right friction pad assembly 14 back to their original positions. The left friction pad assembly 13 then drives the left roller 9 back to its original position through the left piston 10, and the right friction pad assembly 14 then drives the right roller 11 back to its original position through the right piston 12.

[0036] As can be seen from the background art, in the existing technology, how to improve the friction mode between the pushing block and the first wedge block and the second wedge block, and reduce the wear of the pushing block, the first wedge block and the second wedge block, is a technical problem that needs to be solved.

[0037] In this embodiment, the push rod 3 is equivalent to the push block in the prior art, the left piston 10 is equivalent to the first wedge in the prior art, and the right piston 12 is equivalent to the second wedge in the prior art. Compared with the prior art, this embodiment adds a left roller 9 between the push rod 3 and the left piston 10, and a right roller 11 between the push rod 3 and the right piston 12. Thus, rolling friction is formed between the push rod 3 and the left piston 10 through the left roller 9, and between the push rod 3 and the right piston 12 through the right roller 11. Under the same load and the same contact surface material, the coefficient of rolling friction is much smaller than the coefficient of sliding friction, thereby effectively reducing the wear of the push rod 3, the left piston 10, and the right piston 12. Therefore, this embodiment solves the technical problem existing in the prior art, namely, how to improve the friction mode between the push block and the first and second wedges, and reduce the wear of the push block, the first wedge, and the second wedge.

[0038] The left inclined plane 6 and right inclined plane 7 of push rod 3 can also decompose the vertical force into the horizontal pressure. The inclined plane angle is used to amplify the force and form a self-amplifying effect. This part of the principle is common knowledge and is recorded in mechanical design manuals, so it will not be elaborated here.

[0039] Example 2

[0040] This embodiment proposes a new energy vehicle, which includes the electromechanical brake for new energy vehicles proposed in Embodiment 1.

[0041] Furthermore, the new energy vehicle also includes a main controller, which is not shown in the figure. Motor 1 is connected to the main controller for communication.

[0042] In this embodiment, when the new energy vehicle brakes, the motor 1 rotates, and after the left friction plate assembly 13, the right friction plate assembly 14, and the brake drum 20 eliminate contact, the current of the motor 1 will show a clear inflection point. The main controller system identifies and records this position, compares the angle of motor rotation during this process with the design angle, and compares the actual gap between the left friction plate assembly 13, the right friction plate assembly 14, and the brake drum 20 with the design gap, thereby determining whether the actual gap is smaller or larger than the design gap. After the brake is released, when the motor 1 rotates back, the gap is compensated. If the gap is too small, the main controller controls the motor 1 to increase the rotation angle; if the gap is too large, the main controller controls the motor 1 to decrease the rotation angle, so as to ensure that the gap between the left friction plate assembly 13, the right friction plate assembly 14, and the brake drum 20 is constant. This function is also called the bidirectional automatic intelligent gap adjustment function.

[0043] like Figure 3As shown, the housing 26 of the motor 1 further includes a first part 24 and a second part 25, wherein the diameter of the second part 25 is smaller than the diameter of the first part 24, the first part 24 and the second part 25 are coaxially and integrally connected, and the length of the second part 25 along the axial direction of the motor 1 is configured to a first preset length; the axis of the housing 26 forms a first preset angle with the axis of the braking assembly 2.

[0044] The first preset length is adjusted according to the requirements of the whole vehicle. For example, in this embodiment, it is 120mm±10mm; the first preset included angle α=18°±5°.

[0045] In the prior art, the axis of the housing 26 is usually coaxial with the axis of the brake assembly 2, which can easily cause interference with the vehicle battery pack during installation.

[0046] In this embodiment, the length of the second part 25 of the housing 26 is configured as a first preset length, and the axis of the housing 26 and the axis of the braking assembly 2 form a first preset angle. During installation, the vehicle battery pack is completely avoided in the spatial dimension, and mechanical interference can be avoided without reducing the size of the battery pack. This maximizes the chassis battery layout area, improves the vehicle's energy storage capacity and range, and adapts to the integrated design requirements of integrated chassis and skateboard chassis for new energy vehicles.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electromechanical brake for a new energy vehicle, characterized in that, Includes a motor (1) and a braking assembly (2); The braking assembly (2) includes a push rod (3), which has a first section (4) and a second section (5) along the extension direction. The first section (4) is threadedly connected to the rotating shaft of the motor (1). A wedge-shaped part (8) is provided at one end of the second section (5) away from the first section (4). The two sides of the wedge-shaped part (8) are a left inclined surface (6) and a right inclined surface (7), respectively. The left inclined surface (6) and the right inclined surface (7) are close to each other in the direction from the first section (4) to the second section (5), and the left inclined surface (6) and the right inclined surface (7) are far apart from each other in the direction from the second section (5) to the first section (4). The braking assembly (2) also includes a left roller (9), a left piston (10), a right roller (11), and a right piston (12). The left roller (9) and the right roller (11) are distributed on both sides of the push rod (3). The left roller (9) is located between the left piston (10) and the wedge (8). The outer circumferential surface of the left roller (9) makes rolling contact with one end of the left piston (10) and the left inclined surface (6). The right roller (11) is located between the right piston (12) and the wedge (8). The outer circumferential surface of the right roller (11) makes rolling contact with one end of the right piston (12) and the right inclined surface (7). The braking assembly (2) also includes a left friction pad assembly (13) and a right friction pad assembly (14), with the left friction pad assembly (13) located on the side of the left piston (10) away from the left roller (9) and the right friction pad assembly (14) located on the side of the right piston (12) away from the right roller (11). The braking assembly (2) also includes a tension spring (27), the two ends of which are connected to the left friction plate assembly (13) and the right friction plate assembly (14), respectively.

2. The electromechanical brake for new energy vehicle according to claim 1, characterized in that, The braking assembly (2) includes a retainer (15), which is connected to the push rod (3). The retainer (15) does not obstruct the left inclined surface (6) and the right inclined surface (7). The retainer (15) is provided with a left mounting hole (16) and a right mounting hole (17). The left roller (9) is provided with a left connecting post (18) at its end. The left connecting post (18) is inserted into the left mounting hole (16) and rolls in contact with the inner wall of the left mounting hole (16). The right roller (11) is provided with a right connecting post (19) at its end. The right connecting post (19) is inserted into the right mounting hole (17) and rolls in contact with the inner wall of the right mounting hole (17).

3. The electromechanical brake for new energy vehicles according to claim 2, characterized in that, The braking assembly (2) also includes a brake drum (20) and a mounting block (23), which is detachably connected to the brake drum (20); The assembly block (23) is provided with a left channel (21) and a right channel (22); the left piston (10) is axially movable and inserted into the left channel (21), and the outer circumferential surface of the left piston (10) slides in contact with the inner wall of the left channel (21); the right piston (12) is axially movable and inserted into the right channel (22), and the outer circumferential surface of the right piston (12) slides in contact with the inner wall of the right channel (22).

4. A new energy vehicle, characterized in that, Including the electromechanical brake for new energy vehicles as described in any one of claims 1-3.

5. The new energy vehicle according to claim 4, characterized in that, It also includes a main controller, and the motor (1) is connected to the main controller for communication.

6. The new energy vehicle according to claim 5, characterized in that, The housing (26) of the motor (1) includes a first part (24) and a second part (25), wherein the diameter of the second part (25) is smaller than the diameter of the first part (24), the first part (24) and the second part (25) are coaxially and integrally connected, and the length of the second part (25) is configured as a first preset length along the axial direction of the motor (1); The axis of the housing (26) and the axis of the braking assembly (2) form a first preset angle.

Images