Automotive brake servo pressure build-up assembly and vehicle

Abstract

This application provides an automotive brake servo pressure build-up assembly and vehicle, belonging to the technical field of braking systems. It includes a hydraulic integrated block, a motor assembly, a servo cylinder, and a rotating lead screw. The hydraulic integrated block has a first mounting cavity. The motor assembly is connected to one side of the hydraulic integrated block and has a hollow rotor. The servo cylinder is connected to the hydraulic integrated block; the inner cavity of the servo cylinder communicates with the first mounting cavity. The rotating lead screw passes through the first mounting cavity and the inner cavity of the servo cylinder, with one end extending out of the inner cavity of the servo cylinder and poweredly connected to the hollow rotor. A movable nut is screwed onto the rotating lead screw, and a movable piston is connected to the movable nut. The servo cylinder is placed inside the motor assembly and partially extends into the hollow rotor. The movable nut drives the movable piston to slide within the first mounting cavity and the inner cavity of the servo cylinder. The automotive brake servo pressure build-up assembly and vehicle provided by this application can achieve effective space utilization, improve overall integration, and contribute to vehicle lightweighting.

Description

Technical Field

[0001] This application belongs to the field of braking system technology, and more specifically, relates to an automotive brake servo pressure build-up assembly and vehicle. Background Technology

[0002] The automotive brake servo pressure build-up assembly mainly consists of two parts: a drive unit (motor) and an actuator unit (cylinder piston). The drive method mostly uses a brushless DC motor in conjunction with a ball screw. The motor rotor has a hollow design, which directly drives the screw to rotate, thereby driving the nut and piston to move linearly.

[0003] In the existing technology, the motor pressure building module of the electro-hydraulic braking system is complex in design, usually consisting of multiple modules such as motor, valve core, booster servo cylinder, and piston rotation screw. However, the placement of these modules is unreasonable, making assembly difficult and resulting in a large size, which is not conducive to the overall lightweighting and miniaturization of the device. Summary of the Invention

[0004] The purpose of this application is to provide an automotive brake servo pressure build-up assembly and vehicle, aiming to solve the technical problems of high assembly difficulty, large size, and low integration in traditional servo pressure build-up assemblies.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, a servo pressure build-up assembly for automotive brakes is provided, comprising: A hydraulic integrated block having an internal first mounting cavity extending in a first direction; A motor assembly is connected to one side of the hydraulic integrated block; the motor assembly has a hollow rotor for outputting power; A servo cylinder is connected to the hydraulic integrated block; the inner cavity of the servo cylinder is coaxial with the hollow rotor and communicates with the first mounting cavity along the first direction; and Rotate the lead screw, which passes through the first mounting cavity and the inner cavity of the servo cylinder along the first direction, and one end passes through the inner cavity of the servo cylinder and is powered by the hollow rotor. The servo cylinder is located inside the motor assembly and partially extends into the hollow rotor. The portion of the rotating lead screw located in the first mounting cavity is screwed with a movable lead screw nut. A movable piston is connected to the movable lead screw nut. The movable lead screw nut is used to drive the movable piston to slide along the first direction in the inner cavity of the first mounting cavity and the servo cylinder.

[0006] Compared with the prior art, the solution shown in this application embodiment provides a first mounting cavity within the hydraulic integrated block, and connects the first mounting cavity with the inner cavity of the servo cylinder along a first direction, forming a stroke space extending along the first direction for the movement of the movable lead screw and the movable piston. Furthermore, the rotating lead screw passes through the first mounting cavity and the inner cavity of the servo cylinder, guiding the movement of the movable lead screw. The rotating lead screw is also powered by the hollow rotor, enabling its drive. By providing the movable lead screw, the rotating lead screw and the movable lead screw are screwed together, thereby transmitting power to the movable lead screw. By providing the movable piston and fixing the movable lead screw to the movable piston, the movable lead screw drives the movable piston to move along the first direction. The portion of the rotating lead screw located in the first mounting cavity is screwed with a movable lead nut. By placing the main body of the screwed portion of the movable lead nut in the first mounting cavity, the movable lead nut and the movable piston can be integrated into the hydraulic integrated block. Furthermore, the force on the movable lead nut and the movable piston is directly transmitted to the relatively robust hydraulic integrated block, which helps to improve the impact resistance of the movable lead nut and the movable piston. In this application, the servo cylinder is built into the hollow rotor, which can realize the integration of the servo cylinder and the motor assembly. That is, the servo cylinder is integrated into the motor assembly. Since the stroke space of the moving nut and the moving piston includes the first mounting cavity and the inner cavity of the servo cylinder, the stroke space of the moving nut and the moving piston can be transformed from the traditional space between the servo cylinder and the hydraulic integrated block to the space between the hollow rotor of the motor assembly and the hydraulic integrated block. This allows the hollow rotor to ensure the effective stroke of the moving nut and the moving piston while ensuring its driving function. Compared to the traditional approach of separating the servo cylinder and motor assembly on opposite sides of the hydraulic integrated block, the solution adopted in this application integrates the servo cylinder into the motor assembly and integrates the stroke space of the moving screw nut and the moving piston between the hollow rotor and the first mounting cavity of the hydraulic integrated block. This reduces the space occupied and improves the overall space utilization rate. Furthermore, the hollow rotor can achieve the dual functions of drive and stroke guarantee, which can improve the overall integration of the device and help promote the lightweighting of automotive brake servo pressure build-up assemblies.

[0007] In conjunction with the first aspect, in one possible implementation, the automotive brake servo pressure build-up assembly further includes an electronic control unit connected to the other side of the hydraulic integrated block, wherein an angle sensor chip is provided on the opposite side of the electronic control unit and the hydraulic integrated block. The hydraulic integrated block is penetrated through both ends of the first mounting cavity along the first direction. One end of the rotating screw passes through one of the through ends of the first mounting cavity and is powered by the hollow rotor. The other end of the rotating screw extends to the other through end of the first mounting cavity and is connected to the electronic control unit by an angle detection element. The angle detection element is electromagnetically connected to the angle sensor chip. The angle sensor chip is used to receive the sensing signal from the angle detection component and transmit the rotation speed information of the lead screw to the electronic control unit.

[0008] In this embodiment, by integrating the angle sensor chip onto the electronic control unit, the installation of the angle sensor chip is simplified, which helps to reduce the internal connection lines between the angle sensor chip and the electronic control unit and improves the overall integration. Compared with the traditional angle detection structure where the chip is mechanically connected by springs or other means, this embodiment avoids the contact problems that exist in the mechanical connection of the angle sensor chip. By placing the angle detection element at the other end of the rotating screw, the angle detection element and the angle sensor chip can be positioned back-to-back along the first direction, which enables the angle sensor chip to effectively monitor the rotation speed of the rotating screw. In this embodiment, the two ends of the first mounting cavity are connected through the first direction, which facilitates the back-to-back alignment of the angle detection element and the angle sensor chip in the first direction. At the same time, the end of the rotating screw extends to the through end of the first mounting cavity, which allows the moving nut and the moving piston to also extend towards the through end of the first mounting cavity, which helps to increase the stroke of the moving nut and the moving piston, thereby improving the braking performance.

[0009] In conjunction with the first aspect, in one possible implementation, the end of the rotating lead screw located inside the hydraulic integrated block is provided with a limiting shaft segment, and the limiting shaft segment is rotatably connected to the hydraulic integrated block; The movable nut and the movable piston reciprocate between the limiting shaft section and the bottom of the servo cylinder; During the reciprocating motion of the movable nut and the movable piston, the movable piston is always partially inserted into the servo cylinder, and a first sealing element is connected between the inserted end of the movable piston and the inner wall of the servo cylinder.

[0010] By setting a limiting shaft section, on the one hand, the other end of the rotating screw can be rotatably connected to the hydraulic integrated block, and on the other hand, the movable screw nut and the movable piston can be limited at the limiting shaft section to prevent the movable screw nut and the movable piston from coming off from the side away from the motor assembly. Compared with directly connecting the end of the rotating screw to the hydraulic integrated block through the bearing, the limiting shaft section in this application is placed outside the end of the rotating screw, which is convenient for processing and can effectively enhance the support strength of the rotating screw.

[0011] In some embodiments, the limiting shaft segment is rotatably connected to the first mounting cavity via a first bearing, and the first bearing is limited at the through end of the first mounting cavity by a sleeve assembly.

[0012] In this embodiment, a first bearing is used to achieve a rotational connection between the limiting shaft section and the first mounting cavity, and a sleeve assembly is used to limit the end of the first bearing to prevent the first bearing from disengaging from the limiting shaft section.

[0013] For example, the rotating lead screw includes: A threaded segment is placed inside the first mounting cavity and extends along the first direction into the inner cavity of the servo cylinder; the threaded segment is threadedly connected to the movable nut. A sliding section is placed inside the servo cylinder and integrally connected with the threaded section; a steel pipe is sleeved on the sliding section, and the steel pipe is slidably connected to one end of the moving piston that extends into the servo cylinder; The connecting section is integrally connected to the sliding section at one end and extends out of the servo cylinder at the other end, and is powered by the hollow rotor.

[0014] In this embodiment, a threaded section is provided to form a threaded connection between the movable screw nut and the threaded section, thereby driving the movable screw nut to move along the first direction; a sliding section is provided to achieve a sliding connection between the rotating screw and the movable piston, and a steel pipe is provided to reduce the resistance during the sliding process of the movable piston and improve the smoothness and stability of the movable piston's movement; a connecting section is provided to connect the rotating screw with the hollow rotor, thereby realizing the transmission of power from the motor assembly to the rotating screw.

[0015] In conjunction with the first aspect, in one possible implementation, the automotive brake servo pressure build-up assembly further includes: An anti-rotation structure is placed within the first mounting cavity and connected between the movable nut and the hydraulic integrated block; the anti-rotation structure extends along the first direction; The anti-rotation structure is used to prevent the moving nut and the moving piston from rotating.

[0016] In this embodiment, by setting an anti-rotation mechanism, the rotation of the moving piston during its movement in the first direction can be avoided, which helps to ensure the smoothness of the moving piston's movement.

[0017] In some embodiments, the anti-rotation structure includes multiple one-to-one corresponding guide posts and guide grooves; Multiple guide grooves are arranged at intervals along the circumference of the movable nut, and the guide grooves extend along the axial direction of the movable nut; The plurality of guide posts are arranged circumferentially within the hydraulic integrated block along the first mounting cavity; When the movable nut and the movable piston move along the rotating screw, the guide post is slidably connected in the corresponding guide groove.

[0018] The guide post is set in the first mounting cavity and can cooperate with the guide groove on the moving piston to guide the movement of the moving nut and the moving piston. By setting multiple guide grooves and guide posts, it is beneficial to achieve uniform circumferential force during the movement of the moving nut and the moving piston, and improve the stability of the moving piston movement.

[0019] In conjunction with the first aspect, in one possible implementation, the motor assembly includes: The motor housing has an internal partition plate perpendicular to the first direction. The partition plate divides the inner cavity of the motor housing into a first cavity and a second cavity spaced apart along the first direction. The first cavity has an opening facing the hydraulic integrated block. The hollow rotor is installed in the second cavity, one end of the servo cylinder is placed inside the hollow rotor, and the other end passes through the partition plate into the first cavity to connect with the hydraulic integrated block.

[0020] The partition plate divides the motor housing into a first cavity and a second cavity. The second cavity is used to install the hollow rotor, and the cooling oil in the area where the hollow rotor is located can be blocked by the partition plate. The part of the servo cylinder that passes through the partition plate is connected to the hydraulic integrated block. Even if there is oil leakage at the connection between the servo cylinder and the hydraulic integrated block, it will be effectively intercepted by the partition plate, thus avoiding affecting the hollow rotor of the motor assembly. The partition plate can effectively ensure the separation of the hollow rotor area and the servo cylinder connection area, avoiding mutual interference or contamination, which is conducive to ensuring the safety of overall operation.

[0021] In some embodiments, the hydraulic manifold is provided with an oil guide channel for communication with an external oil circuit; The portion of the servo cylinder that extends into the first cavity is provided with an extension that extends radially along the servo cylinder. The extension is provided with a first oil passage, one end of which is connected to the oil guide channel, and the other end is connected to the inner cavity of the servo cylinder.

[0022] The oil guide channel is used to guide the external oil circuit to the servo cylinder through the first oil passage, so as to realize the flow of external oil to the servo cylinder; by setting the extension, the contact area between the servo cylinder and the hydraulic integrated block is increased, which is conducive to setting the first oil passage on the extension, thereby realizing the introduction of oil into the servo cylinder.

[0023] Secondly, embodiments of this application also provide a vehicle that includes the aforementioned automotive brake servo pressure build-up assembly.

[0024] The vehicle provided in this application, having included the aforementioned automotive brake servo pressure build-up assembly, possesses all the beneficial effects of the aforementioned automotive brake servo pressure build-up assembly. It can improve the space utilization rate of the automotive brake servo pressure build-up assembly, achieve effective space utilization, and enhance the overall integration of the vehicle, thus contributing to the lightweighting of the automotive brake servo pressure build-up assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the automotive brake servo pressure build-up assembly provided in the embodiments of this application; Figure 2 This is a partial structural schematic diagram of the automotive brake servo pressure build-up assembly provided in an embodiment of this application; Figure 3 For the appendix Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the anti-rotation structure provided in an embodiment of this application.

[0027] In the diagram: 1. Hydraulic integrated block; 11. First mounting cavity; 12. Oil guide channel; 2. Motor assembly; 21. Motor housing; 22. Hollow rotor; 23. Partition plate; 231. Limiting boss; 24. First cavity; 25. Second cavity; 26. Second bearing; 27. Third bearing; 3. Servo cylinder; 31. Extension; 32. First oil passage; 33. First seal; 34. Second seal; 4. Rotating screw; 41. Limiting shaft section; 411 411. First shaft section; 412. Second shaft section; 413. Third shaft section; 42. Threaded section; 43. Sliding section; 44. Connecting section; 45. Steel pipe; 46. First bearing; 47. Stepped sleeve; 48. Outer sleeve; 5. Moving nut; 51. Moving piston; 6. Electrical control unit; 61. Angle sensor chip; 62. Angle sensor magnet; 7. Third seal; 8. Fourth seal; 9. Anti-rotation structure; 91. Guide post; 92. Guide groove. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] It should be noted that the orientation or positional relationship indicated by "front", "back", "inner", "outer", "upper", "lower" in this embodiment is based on the first direction. Setting them front and back along the first direction can be understood as the relative position of the two components in the first direction, and does not limit the specific front and back.

[0032] In addition, for ease of explanation, the direction indicated by arrow B in this application is used to indicate the first direction. This first direction is the same as the axis of the rotating lead screw, the axis of the servo cylinder cavity, and the axis of the first mounting cavity, and can be understood as the same direction.

[0033] In traditional technology, the motor and booster servo cylinder are usually located on opposite sides of the valve core, with one end of the rotating screw connected to the motor and the other end passing through the valve core and connected to the servo cylinder. The overall axial length of the automotive brake servo pressure build-up assembly on the rotating screw is relatively long, resulting in a large footprint, low integration, and hindering the overall lightweighting of the vehicle.

[0034] On the other hand, since the rotating lead screw needs to pass through from the motor end to the servo cylinder end, the coaxiality of the rotating lead screw with the motor part, the valve core part and the booster servo cylinder part needs to be adjusted separately. The coaxiality adjustment is complicated and the actual accuracy is not high, which can easily cause noise and other problems.

[0035] Please refer to the following: Figures 1 to 4The present application will now describe the automotive brake servo pressure build-up assembly and the vehicle provided. The automotive brake servo pressure build-up assembly includes a hydraulic integrated block 1, a motor assembly 2, a servo cylinder 3, and a rotating lead screw 4. The hydraulic integrated block 1 has a first mounting cavity 11 extending in a first direction. The motor assembly 2 is connected to one side of the hydraulic integrated block 1. The motor assembly 2 has a hollow rotor 22 for outputting power. The servo cylinder 3 is connected to the hydraulic integrated block 1. The inner cavity of the servo cylinder 3 is coaxial with the hollow rotor 22 and communicates with the first mounting cavity 11 in a first direction. The rotating lead screw 4 passes through the first mounting cavity 11 and the inner cavity of the servo cylinder 3 in a first direction, and one end of the rotating lead screw 4 extends out of the inner cavity of the servo cylinder 3 and is poweredly connected to the hollow rotor 22. The servo cylinder 3 is placed inside the motor assembly 2 and partially extends into the hollow rotor 22. The portion of the rotating lead screw 4 placed in the first mounting cavity 11 is screwed with a movable nut 5. A movable piston 51 is connected to the movable nut 5. The movable nut 5 is used to drive the movable piston 51 to slide in the first mounting cavity 11 and the inner cavity of the servo cylinder 3 in a first direction.

[0036] It should be understood that the hydraulic integrated block 1 used in this application embodiment can be understood as the valve core part. The first mounting cavity 11 provided in the hydraulic integrated block 1 has at least one end through so that the first mounting cavity 11 is connected to the inner cavity of the servo cylinder 3, thereby allowing the rotating screw 4 to pass through the first mounting cavity 11 into the inner cavity of the servo cylinder 3.

[0037] In this embodiment, the hydraulic integrated block 1 not only provides an oil passage, but also, through the aforementioned first mounting cavity 11 structure, undertakes the functions of supporting, sealing, and guiding the rotating screw 4.

[0038] Furthermore, the hollow rotor 22 of the motor assembly 2 is used to output power, and the power can be transmitted from the hollow rotor 22 of the motor assembly 2 to the rotating screw 4 through the power connection between the hollow rotor 22 and the rotating screw 4. Since the movable nut 5 is screwed to the rotating screw 4, when the rotating screw 4 rotates, the movable nut 5 can move along the axial direction of the rotating screw 4, that is, move between the first mounting cavity 11 and the inner cavity of the servo cylinder 3 in the first direction.

[0039] Specifically, when the hollow rotor 22 drives the rotating lead screw 4 to rotate, the rotating lead screw 4 drives the movable lead screw nut 5 and the movable piston 51 to move axially, thereby causing the movable lead screw nut 5 and the movable piston 51 to move forward / backward in the first mounting cavity 11 and the inner cavity of the servo cylinder 3, so as to generate braking pressure or release pressure at the corresponding oil port of the hydraulic integrated block 1. The movable lead screw nut 5 and the movable piston 51 slide between the first mounting cavity 11 of the hydraulic integrated block 1 and the inner cavity of the servo cylinder 3, which can realize the conversion between hydraulic pressure building and linear motion.

[0040] The hollow rotor 22 integrates a servo cylinder 3, avoiding the excessive space occupied by an externally mounted servo cylinder 3. Furthermore, the end of the rotating screw 4 extends out of the servo cylinder 3 and is powered by the hollow rotor 22. Therefore, while ensuring power drive for the rotating screw 4, the hollow rotor 22 still achieves coaxial arrangement between the servo cylinder 3 and the rotating screw 4. Specifically, the hollow rotor 22 is powered by the rotating screw 4, thus coaxial with it. Since the hollow rotor 22 is also coaxial with the inner cavity of the servo cylinder 3, the inner cavity of the servo cylinder 3 and the rotating screw 4 are also coaxial. Compared to traditional technologies, the servo cylinder 3 in this application is not arbitrarily suspended but is built into the hollow rotor 22. This internally and externally enclosed structure provides a mechanical self-alignment tendency, making it easier to ensure coaxiality than the external shaft-to-shaft structure of traditional technologies. This simplifies the coaxial arrangement, improves the overall coaxial accuracy of the device, and reduces the risk of noise generation.

[0041] In addition, the hollow rotor 22 has a built-in servo cylinder 3, which still allows the servo cylinder 3 to maintain a complete and independent hydraulic working chamber, so that the servo cylinder 3 can obtain sufficient effective stroke and ensure that the moving nut 5 and the moving piston 51 complete the pressure building and return actions in the hydraulic integrated block 1 and the inner cavity of the servo cylinder 3.

[0042] It should be noted that because the servo cylinder 3 is placed inside the hollow rotor 22, the axial length of this device can be made relatively short, that is, the axial dimension is reduced.

[0043] Understandably, due to the reduction in axial dimensions, there is no additional deceleration mechanism, resulting in fast response speed and low noise. Furthermore, the hydraulic integrated block 1 can simultaneously include pressure sensors, valve ports, oil reservoir interfaces, etc., forming a compact braking module. Preferably, the automotive brake servo pressure build-up assembly provided in this application is suitable for use in new energy vehicles and autonomous driving redundant braking systems.

[0044] Preferably, the rotating lead screw 4 used in this application is a ball bearing rotating lead screw 4, which can effectively reduce the resistance during rotation and improve braking performance.

[0045] The main bodies of the movable screw nut 5 and the movable piston 51 do not occupy additional space behind the servo cylinder 3, but are screwed together with the threaded section 42 in the integrated block, which is conducive to reducing the axial length of the assembly. In addition, the first mounting cavity 11 provides the movable screw nut 5 with full-range, continuous and high-precision sliding guidance, which helps to avoid the problem of the movable screw nut 5 swaying due to excessive overhang.

[0046] It is worth mentioning that even under the most severe working conditions, such as during emergency braking, the huge hydraulic pressure borne by the moving screw nut 5 and the moving piston 51 is still contained by the hydraulic integrated block 1. This allows the force on the moving screw nut 5 and the moving piston 51 to be directly transmitted to the robust hydraulic integrated block 1, rather than being borne solely by the suspended rotating screw 4 or the thin-walled servo cylinder 3. The force flow path on the moving screw nut 5 and the moving piston 51 is short and has high rigidity, which is beneficial to improving the structural rigidity and impact resistance of the moving screw nut 5 and the moving piston 51.

[0047] In this embodiment, the main motion trajectories of the movable nut 5 and the movable piston 51 are restricted within the most robust and precisely machined hydraulic integrated block 1, thereby ensuring the compactness, smoothness of motion, and long-term reliability of the assembly while achieving a long braking stroke.

[0048] Compared with the prior art, the automotive brake servo pressure build-up assembly provided in this application, by setting a first mounting cavity 11 in the hydraulic integrated block 1 and connecting the first mounting cavity 11 with the inner cavity of the servo cylinder 3 along a first direction, can form a stroke space extending along the first direction for the movement of the movable screw nut 5 and the movable piston 51; and the rotating screw 4 passes through the first mounting cavity 11 and the inner cavity of the servo cylinder 3, which can realize the movement guidance of the movable screw nut 5, and the rotating screw 4 is poweredly connected to the hollow rotor 22 to realize the drive of the rotating screw nut 4; by setting the movable screw nut 5, the rotating screw 4 and the movable screw nut 5 are screwed together, thereby realizing the transmission of power to the movable screw nut 5; by setting the movable piston 51 and fixing the movable screw nut 5 and the movable piston 51, the movable screw nut 5 drives the movable piston 51 to move along the first direction.

[0049] The portion of the rotating lead screw 4 located in the first mounting cavity 11 is screwed with a movable lead screw nut 5. By placing the main body of the screwed portion of the movable lead screw nut 5 in the first mounting cavity 11, the movable lead screw nut 5 can be integrated into the hydraulic integrated block 1. Furthermore, the force on the movable lead screw nut 5 and the movable piston 51 is directly transmitted to the relatively robust hydraulic integrated block 1, which helps to improve the impact resistance of the movable lead screw nut 5 and the movable piston 51.

[0050] In this application, the servo cylinder 3 is built into the hollow rotor 22, which can realize the integration of the servo cylinder 3 and the motor assembly 2. That is, the servo cylinder 3 is integrated into the motor assembly 2. Since the stroke space of the moving nut 5 and the moving piston 51 includes the first mounting cavity 11 and the inner cavity of the servo cylinder 3, the stroke space of the moving nut 5 and the moving piston 51 can be changed from the traditional space between the servo cylinder 3 and the hydraulic integrated block 1 to the space between the hollow rotor 22 of the motor assembly 2 and the hydraulic integrated block 1. This allows the hollow rotor 22 to further meet the effective stroke requirements of the moving nut 5 and the moving piston 51 while ensuring its driving function.

[0051] Compared to the traditional approach of separating the servo cylinder 3 and the motor assembly 2 on opposite sides of the hydraulic integrated block 1, the solution adopted in this application integrates the servo cylinder 3 into the motor assembly 2 and integrates the stroke space of the moving screw nut 5 and the moving piston 51 between the hollow rotor 22 and the first mounting cavity 11 of the hydraulic integrated block 1. This reduces the space occupied and improves the overall space utilization rate. Furthermore, the hollow rotor 22 can achieve the dual functions of driving and stroke guarantee, which can improve the overall integration of the device and promote the lightweighting of the automotive brake servo pressure build-up assembly.

[0052] Please see Figure 1 In some possible embodiments, the automotive brake servo pressure build-up assembly also includes an electronic control unit 6 connected to the other side of the hydraulic integrated block 1. An angle sensor chip 61 is provided on the opposite side of the electronic control unit 6 and the hydraulic integrated block 1. The two ends of the first mounting cavity 11 pass through the hydraulic integrated block 1 along a first direction. One end of the rotating screw 4 passes through one of the through ends of the first mounting cavity 11 and is poweredly connected to the hollow rotor 22. The other end of the rotating screw 4 extends to the other through end of the first mounting cavity 11 and is connected to the electronic control unit 6 by an angle detection element. The angle detection element is electromagnetically connected to the angle sensor chip 61. The angle sensor chip 61 is used to receive the sensing signal from the angle detection element and transmit the rotation speed information of the rotating screw 4 to the electronic control unit 6.

[0053] In this embodiment, by integrating the angle sensor chip 61 onto the electronic control unit 6, the installation of the angle sensor chip 61 is simplified, which helps to reduce the internal connection lines between the angle sensor chip 61 and the electronic control unit 6 and improve the overall integration. Compared with the traditional angle detection structure where the chip is mechanically connected by springs or other means, this embodiment avoids the problem of poor contact in the mechanical connection of the angle sensor chip 61. By setting the angle detection element at the other end of the rotating screw 4 and making the angle detection element and the angle sensor chip 61 face each other back and forth along the first direction, the angle sensor chip 61 can effectively monitor the rotation speed of the rotating screw 4. In this embodiment, the two ends of the first mounting cavity 11 are arranged through the first direction, which facilitates the front and back facing of the angle detection element and the angle sensor chip 61 in the first direction. At the same time, the end of the rotating screw 4 extends to the through end of the first mounting cavity 11, which allows the moving screw nut 5 and the moving piston 51 to also extend towards the through end of the first mounting cavity 11, which helps to increase the stroke of the moving screw nut 5 and the moving piston 51, thereby improving the braking performance.

[0054] For example, the angle detection component is specifically an angle sensor magnet 62, which is fixed to the through end of the rotating screw 4 and corresponds to the angle sensor chip 61 along the axial direction of the rotating screw 4. The angle sensor magnet 62 is used to generate a magnetic field, and the angle sensor chip 61 senses the change in the direction of the magnetic field to measure the angle, thereby realizing the rotational speed measurement of the rotating screw 4 and obtaining the rotational speed information of the motor assembly 2.

[0055] For example, the angle detection device includes a metal target plate and a coil. The metal target plate is fixed to the through end of the rotating lead screw 4, and the coil is fixed on the electronic control unit 6 and corresponds to the metal target plate along the axial direction of the rotating lead screw 4. The angle detection device measures the position by changing the inductance of the coil when the metal target plate rotates with the rotating lead screw 4 based on the eddy current effect between the coil and the metal target plate. This enables the measurement of the rotational speed of the rotating lead screw 4, thereby facilitating the acquisition of the rotational speed information of the motor assembly 2.

[0056] The electronic control unit 6 is the ECU (Electronic Control Unit). In this embodiment, the electronic control unit 6 specifically refers to the electronic control unit 6 of the braking system. The electronic control unit 6 is connected to the other side of the hydraulic integrated block 1. It can be understood that the electronic control unit 6 and the motor assembly 2 are arranged opposite to each other on both sides of the hydraulic integrated block 1 along the first direction, which can realize a high degree of integration of control, drive and hydraulics.

[0057] The first mounting cavity 11 has hydraulic integrated blocks 1 passing through both ends. One end of the rotating screw 4 passes through the servo cylinder 3 and is used to connect the hollow rotor 22 to realize power input. The other end of the rotating screw 4 extends to the other through end of the first mounting cavity 11 and has an angle detection component. Specifically, the angle detection component is usually set as a magnetic ring, magnet or multipole magnet.

[0058] Angle sensor chip 61 is fixed on electronic control unit 6 and is opposite to the angle detection element at the end of the rotating lead screw 4 to form a non-contact rotation angle / speed measurement. For example, when the angle detection element is an angle sensing magnet, speed information can be transmitted through magnetic induction, such as Hall effect or magnetoresistive.

[0059] When the angle sensor chip 61 receives the sensing signal from the angle detection component, it can convert the sensing signal into the rotation speed / position / angle information of the lead screw 4 and transmit it to the electronic control unit 6 for motor control, brake pressure closed-loop control, vehicle stability control, etc.

[0060] In this embodiment, the end of the rotating lead screw 4 extends into the first mounting cavity 11, and an angle detection element is arranged at this end to achieve a positional correspondence between the angle detection element and the angle sensor chip 61, thereby realizing the measurement of rotational speed. The angle sensor chip 61 is integrated on the ECU circuit board, and the magnet is directly mounted on the end of the rotating lead screw 4, avoiding the need for additional external sensors to occupy space, and eliminating the need for a separate speed sensor harness and bracket. This helps reduce system costs and potential failure points, allowing the angle sensor chip 61 to directly obtain the real motion information of the rotating lead screw 4, thus meeting the closed-loop control requirements of the brake-by-wire system for the state of the rotating lead screw 4.

[0061] Optionally, the angle sensor magnet 62 can be connected to the end of the rotating lead screw 4 via a fastening nut.

[0062] Please see Figure 2 In some possible embodiments, the end of the rotating lead screw 4 placed inside the hydraulic integrated block 1 is provided with a limiting shaft section 41, which is rotatably connected to the hydraulic integrated block 1; the movable lead screw nut 5 and the movable piston 51 reciprocate between the limiting shaft section 41 and the bottom of the servo cylinder 3; wherein, when the movable lead screw nut 5 and the movable piston 51 reciprocate, the movable piston 51 is always partially inserted into the servo cylinder 3, and a first seal 33 is connected between the inserted end of the movable piston 51 and the inner wall of the servo cylinder 3.

[0063] By setting the limiting shaft section 41, on the one hand, the other end of the rotating screw 4 can be rotatably connected to the hydraulic integrated block 1, and on the other hand, the movable screw nut 5 and the movable piston 51 can be limited at the limiting shaft section 41 to prevent the movable screw nut 5 and the movable piston 51 from coming off from the side away from the motor assembly 2. Compared with directly connecting the end of the rotating screw 4 to the hydraulic integrated block 1 through the bearing, the limiting shaft section 41 in this application is placed outside the end of the rotating screw 4, which is convenient for processing and can effectively enhance the support strength of the rotating screw 4.

[0064] Specifically, the limiting shaft section 41 extends to the through end of the first mounting cavity 11, and the aforementioned angle detection component is fixed on the limiting shaft section 41. The end of the limiting shaft section 41 near the motor assembly 2 limits the movement of the moving nut 5 and the moving piston 51, while the other end is used to integrate the angle detection component so that the position of the angle detection component corresponds to that of the angle sensor chip 61.

[0065] When the movable nut 5 and the movable piston 51 slide between the first mounting cavity 11 and the inner cavity of the servo cylinder 3, they have two extreme positions. The first is when the movable nut 5 is limited to the limiting shaft section 41, which can be understood as the movable nut 5 being in the initial position, i.e., when no pressure is built up. The second is when the movable piston 51 slides to the bottom of the servo cylinder 3, which corresponds to the maximum stroke of the movable piston 51, i.e., the extreme pressure building position.

[0066] When the movable screw nut 5 and the movable piston 51 are limited to the initial position of the limiting shaft section 41, one end of the movable screw nut 5 extends into the servo cylinder 3, and when the movable screw nut 5 and the movable piston 51 move axially along the rotating screw 4, the movable piston 51 is slidably connected to the inner cavity of the servo cylinder 3.

[0067] The moving piston 51 is sealed to the inner wall of the servo cylinder 3 by the first seal 33, which can seal and isolate the high-pressure inner cavity of the servo cylinder 3 to prevent hydraulic oil from leaking to the low-pressure side or the rotating screw 4 cavity.

[0068] It should be noted that in traditional solutions, the rotating lead screw 4 is often not installed through the hydraulic integrated block 1. The initial position of the moving piston 51 usually relies on the internal spring or external retaining ring for limiting, which has limited accuracy and may change with spring fatigue. In this application, the rotating lead screw 4 extends to the through end of the first mounting cavity 11, and specifically the limiting shaft section 41 extends to the through end of the first mounting cavity 11, providing a rigid and precise mechanical zero point for the moving piston 51. When the moving piston 51 retracts to the limiting shaft section 41, the exact position of the moving piston 51 can be clearly known.

[0069] The through-type rotating screw 4 in this application allows the entire assembly to be clearly functionally divided along its axis: one end of the rotating screw 4 is connected to the hollow rotor 22 for power drive, the middle part realizes hydraulic conversion and guides the moving piston 51 at the hydraulic integration block 1, and the other end is opposite to the electronic control unit 6 through the angle detection element to realize speed sensing and control. The three major functions of power, hydraulics and control are physically coaxial, which is conducive to forming a highly integrated wire-controlled braking module unit.

[0070] For example, the hydraulic integrated block 1 has a protrusion that protrudes toward the electronic control unit 6, and a first mounting hole extends into the protrusion along a first direction, and the limiting shaft segment 41 extends into the protrusion.

[0071] By setting a protrusion to extend the axial length of the hydraulic integrated block 1 in the first direction, on the one hand, the angle detection element connected to the end of the limiting shaft section 41 can be extended to the angle sensor chip 61 to form speed monitoring; on the other hand, the axial length of the first mounting cavity 11 can be extended, thereby making it possible to design a long stroke for the moving screw nut 5 and the moving piston 51, which is beneficial to improving braking performance.

[0072] It is important to understand that the discharge volume of the moving piston 51 is equal to the product of the piston cross-sectional area and the stroke. Increasing the discharge volume can improve the overall braking performance. Therefore, to increase the discharge volume, the cross-sectional area of ​​the moving piston 51 can be enlarged or the stroke of the moving piston 51 can be increased. However, the increase in stroke will affect its guidance and stability. Therefore, a long stroke requires a long piston to provide sufficient guiding length to prevent tilting and jamming during movement.

[0073] In this application, a protrusion is provided on the hydraulic integrated block 1, and the first mounting cavity 11 extends to the protrusion, which makes it possible for the axial length of the movable nut 5 to extend within the first mounting cavity 11, which is beneficial to meet the long stroke requirements of the movable piston 51.

[0074] Please see Figures 1 to 3 In some embodiments, the limiting shaft segment 41 is rotatably connected to the first mounting cavity 11 by a first bearing 46, and the first bearing 46 is limited to the through end of the first mounting cavity 11 by a sleeve assembly.

[0075] Specifically, in this embodiment of the application, the sleeve assembly includes a stepped sleeve 47 and an outer sleeve 48.

[0076] In this embodiment, the rotational connection between the limiting shaft section 41 and the first mounting cavity 11 is achieved by the first bearing 46, and the end of the first bearing 46 is limited by the sleeve assembly to prevent the first bearing 46 from disengaging from the limiting shaft section 41.

[0077] For example, the limiting shaft segment 41 includes a first shaft segment 411, a second shaft segment 412, and a third shaft segment 413; the first shaft segment 411 abuts against the shaft end face of the movable nut 5; the second shaft segment 412 is connected to the first shaft segment 411 and is rotatably connected to the hydraulic integrated block 1 through a first bearing 46; the diameter of the second shaft segment 412 is smaller than the diameter of the first shaft segment 411; the third shaft segment 413 is connected to the second shaft segment 412; the diameter of the third shaft segment 413 is smaller than the diameter of the second shaft segment 412; wherein, a first stepped surface is formed between the first shaft segment 411 and the second shaft segment 412, and one side of the first bearing 46 is limited at the first stepped surface.

[0078] It should be noted that the first bearing 46 has a first side facing the movable nut 5 and a second side opposite to the first side; the first stepped surface is limited to the inner ring of the first side of the first bearing 46, and the first mounting cavity 11 also has a limiting stepped surface corresponding to the position of the first side of the first bearing 46, which is used to limit the outer ring of the first side of the first bearing 46.

[0079] Specifically, the diameters of the first shaft segment 411, the second shaft segment 412, and the third shaft segment 413 decrease sequentially; the first shaft segment 411 has the largest diameter, and its end face directly abuts against the movable nut 5, serving as an axial mechanical limit.

[0080] For example, a stepped sleeve 47 is connected to the third shaft segment 413. One end of the stepped sleeve 47 is placed inside the first bearing 46, and the other end extends out of the first bearing 46. The stepped sleeve 47 is placed between the inner and outer parts of the first bearing 46 to form a second stepped surface. The second inner ring of the first bearing 46 is limited between the first stepped surface and the second stepped surface.

[0081] Furthermore, the through end of the first mounting cavity 11 is also provided with an outer sleeve 48, which is arranged around the outside of the stepped sleeve 47 and screwed to the inner wall of the first mounting cavity 11. The second step surface of the stepped sleeve 47 is limited to the inner ring on the second side of the first bearing 46, and the end face of the outer sleeve 48 facing the movable nut 5 is limited to the outer ring on the second side of the first bearing 46.

[0082] The outer sleeve 48 and the stepped sleeve 47 together form the sleeve assembly described above, which limits the end face of the first bearing 46 within the first mounting cavity 11. Furthermore, the outer sleeve 48 is threaded to the inner wall of the first mounting cavity 11, and the stepped sleeve 47 is threaded to the third shaft segment 413, thereby securing the outer sleeve 48 and the stepped sleeve 47.

[0083] In this embodiment, the first shaft segment 411 abuts against the shaft end face of the movable nut 5, thereby limiting the shaft end of the movable nut 5; the second shaft segment 412 is fitted with a first bearing 46, thereby enabling a rotatable connection between the second shaft segment 412 and the hydraulic integrated block 1; a first stepped surface can be formed between the first shaft segment 411 and the second shaft segment 412 to limit the first bearing 46 to one side; the third shaft segment 413 facilitates the installation of the stepped sleeve 47, which is used to form a second stepped surface to axially limit the first bearing 46 to the other side.

[0084] It should be understood that clamping the first bearing 46 between the first and second step surfaces can achieve bidirectional fixation of the first bearing 46, which helps to save axial space.

[0085] Please see Figure 2 For example, the rotating lead screw 4 includes a threaded section 42, a sliding section 43, and a connecting section 44; the threaded section 42 is placed in the first mounting cavity 11 and extends along the first direction to the inner cavity of the servo cylinder 3; the threaded section 42 is threadedly connected to the movable lead screw nut 5; the sliding section 43 is placed in the inner cavity of the servo cylinder 3 and is integrally connected to the threaded section 42; a steel pipe 45 is sleeved on the sliding section 43, and the steel pipe 45 is slidably connected to one end of the movable piston 51 that extends into the servo cylinder 3; one end of the connecting section 44 is integrally connected to the sliding section 43, and the other end extends out of the servo cylinder 3 and is poweredly connected to the hollow rotor 22.

[0086] In this embodiment, a threaded section 42 is provided to form a threaded connection between the movable screw nut 5 and the threaded section 42, thereby driving the movable screw nut 5 to move along the first direction; a sliding section 43 is provided to realize a sliding connection between the rotating screw 4 and the movable piston 51, and a steel pipe 45 is provided to reduce the resistance during the sliding process of the movable piston 51 and improve the smoothness and stability of the movement of the movable piston 51; a connecting section 44 is provided to realize the power connection between the rotating screw 4 and the hollow rotor 22, thereby realizing the transmission of power from the motor assembly 2 to the rotating screw 4.

[0087] It should be understood that in this application, there is a threaded connection between the rotating lead screw 4 and the movable lead nut 5. The threaded section 42 of the rotating lead screw 4 is mainly concentrated in the first mounting cavity 11 and partially extends out of the first mounting cavity 11. The movable lead nut 5 is screwed onto the threaded section 42 of the rotating lead screw 4. Therefore, the main body of the movable lead nut 5 mainly moves within the first mounting cavity 11. Even when the movable lead nut 5 moves along the rotating lead screw 4, the movable lead nut 5 will not completely extend out of the first mounting cavity 11.

[0088] Optionally, the connecting section 44 of the rotating lead screw 4 is connected to the hollow rotor 22 by means of either knurling or spline connection to transmit torque.

[0089] The movable piston 51 slides on the steel tube 45, rather than directly on the rotating lead screw 4, which helps reduce the risk of wear on the rotating lead screw 4. The steel tube 45 provides a smooth, wear-resistant sliding surface. Optionally, the sliding section 43 itself can be set as an untreated or non-precision machined surface, while the relatively smooth outer circumferential surface of the steel tube 45 can reduce the resistance during the movement of the movable piston 51. The steel tube 45 can evenly transmit the radial force between the movable piston 51 and the rotating lead screw 4, avoiding localized wear. At the same time, the steel tube 45 sleeved on the outside of the rotating lead screw 4 is easy to replace, which is beneficial for subsequent maintenance.

[0090] The connecting section 44 is directly connected to the hollow rotor 22 without a coupling or intermediate transmission component, which can shorten the axial length and improve the transmission accuracy and response speed.

[0091] Furthermore, to ensure the sealing performance of the high-pressure oil chamber, a third sealing element 7 is provided between the steel pipe 45 and the moving piston 51, and a fourth sealing element 8 is provided between the steel pipe 45 and the servo cylinder 3. The fourth sealing element 8 is located at the part of the rotating screw 4 that is about to extend out of the servo cylinder 3, in order to prevent oil leakage in the inner cavity of the servo cylinder 3 and ensure the oil pressure in the inner cavity of the servo cylinder 3.

[0092] It is worth noting that in this embodiment, the threaded section 42, the sliding section 43, the connecting section 44, and the limiting shaft section 41 are an integral connection structure, that is, the above four sections of the rotating screw 4 are a rigid whole, which can ensure the support strength of the rotating screw 4. Compared with the segmented split structure, the rigid integral rotating screw 4 provided in this embodiment has higher rigidity and strength, which is beneficial to extending the service life of the rotating screw 4.

[0093] Please see Figure 1 In some possible embodiments, the automotive brake servo pressure build-up assembly further includes an anti-rotation structure 9; the anti-rotation structure 9 is located in the first mounting cavity 11 and connected between the movable nut 5 and the hydraulic integrated block 1; the anti-rotation structure 9 extends along a first direction; the anti-rotation structure 9 is used to prevent the movable nut 5 and the movable piston 51 from rotating.

[0094] In this embodiment of the application, by setting an anti-rotation mechanism, the rotation of the moving piston 51 during the movement along the first direction can be avoided, which helps to ensure the smoothness of the moving piston 51 during the movement process.

[0095] Optionally, the movable screw nut 5 and the movable piston 51 are fixed by a threaded connection. The two are manufactured separately and then fixedly connected, rather than being processed as a whole. During maintenance, the worn parts can be replaced separately. Usually, the movable screw nut 5 wears first. When its wear is more severe, it can be replaced separately, which helps to save maintenance and replacement costs.

[0096] The anti-rotation structure 9 extends along the first direction and can provide full-stroke guidance to ensure that the moving piston 51 does not wobble during long strokes.

[0097] For example, the anti-rotation structure 9 can be a spline connection, such as a spline on the outer wall of the movable piston 51 and a keyway on the inner wall of the first mounting cavity 11 of the hydraulic integrated block 1. The anti-rotation of the movable nut 5 and the movable piston 51 is achieved through the cooperation of the spline and the keyway.

[0098] For example, the anti-rotation structure 9 adopts a non-circular cross section, and sets the outer contour of the movable piston 51 to be elliptical or flat. A structure that matches its contour is formed on the inner wall of the first mounting cavity 11 of the hydraulic integrated block 1, thereby realizing the anti-rotation of the movable piston 51 and the movable nut 5.

[0099] For example, the movable nut 5 in this embodiment includes a flange section, an intermediate section and a threaded fixing section, and the radial dimensions of the flange section, the intermediate section and the threaded fixing section decrease sequentially; wherein, the flange section is used to provide the anti-rotation mechanism between itself and the inner wall of the first mounting cavity 11; the threaded fixing section is used to be screwed and fixed to the movable piston 51, and the intermediate section is used to connect the flange section and the threaded fixing section.

[0100] Furthermore, the aforementioned flange section, intermediate section, and threaded fixing section are an integral structure, not a separate structure, which helps to ensure the strength of the movable nut 5.

[0101] The flange section has the largest radial dimension, providing more space and lever arm for the anti-rotation mechanism; at the same time, the flange end face of the flange section can serve as the axial positioning reference for the movable nut 5. The threaded fixing section has the smallest radial dimension, which can reduce the internal thread diameter of the movable piston 51, thereby increasing the piston wall thickness and facilitating the placement of the third seal 7; at the same time, the smaller thread is easier to tighten and has a better anti-loosening effect.

[0102] The smooth transition in the middle section can eliminate stress concentration and improve the impact fatigue strength of the movable nut 5; in addition, the middle section can provide a clear axial positioning step surface and also provide clearance space for the inner hole of the movable piston 51.

[0103] For example, the movable piston 51 is screwed onto the threaded fixing section of the movable screw nut 5, with one end extending to the outer peripheral wall of the middle section and the other end extending through the threaded fixing section and slidably connected to the sliding section 43 of the rotating screw 4. Specifically, the movable piston 51 is slidably connected to the steel pipe 45 on the outer peripheral wall of the sliding section 43, and a third seal 7 is provided between the movable piston 51 and the steel pipe 45. The third seal 7 is used to prevent the oil in the servo cylinder 3 from entering between the movable piston 51 and the rotating screw 4.

[0104] In this embodiment, the movable piston 51 is not simply fitted onto the movable nut 5, but is screwed onto the threaded fixing section with the smallest radial dimension, and extends axially to cover the middle section. This allows the movable piston 51 to obtain a stable threaded connection, while also utilizing the thicker radial space of the middle section to increase the wall thickness. At the same time, it ensures that the movable nut 5 will not move relative to each other during reciprocating motion, thus guaranteeing transmission accuracy.

[0105] By limiting the other end of the moving piston 51 to extend through the threaded fixed section and the sliding section 43 of the rotating screw 4, an additional radial fulcrum is provided for the slender moving screw nut 5. This effectively prevents the moving screw nut 5 and the moving piston 51 from swaying due to gravity or vibration, ensuring that they always maintain high coaxiality with the rotating screw 4 and the servo cylinder 3 during long-stroke motion, which helps to reduce motion resistance and wear.

[0106] The third seal 7 prevents hydraulic oil from corroding the threads of the rotating screw 4, which helps ensure the long-term reliable operation of the assembly.

[0107] Please see Figure 4In some embodiments, the anti-rotation structure 9 includes multiple one-to-one corresponding guide posts 91 and guide grooves 92; the multiple guide grooves 92 are spaced apart circumferentially along the movable screw nut 5, and the guide grooves 92 extend axially along the movable screw nut 5; the multiple guide posts 91 are spaced apart circumferentially along the first mounting cavity 11 in the hydraulic integrated block 1; wherein, when the movable screw nut 5 and the movable piston 51 move along the rotating screw 4, the guide posts 91 are slidably connected in the corresponding guide grooves 92.

[0108] The guide post 91 is set in the first mounting cavity 11 and can cooperate with the guide groove 92 on the movable screw nut 5 to realize the movement guidance of the movable screw nut 5. By setting multiple guide grooves 92 and guide posts 91, it is beneficial to realize the uniformity of circumferential force during the movement of the movable screw nut 5 and the movable piston 51, and improve the stability of the movement of the movable screw nut 5 and the movable piston 51.

[0109] Preferably, in this application, the movable nut 5 has a flange section, and the outer peripheral wall of the flange section is provided with the aforementioned multiple guide grooves 92; furthermore, the axial length of the flange section can be selectively set according to actual needs, and its length should not be too long to reduce the influence of the guide grooves 92 on the strength of the movable nut 5.

[0110] On the other hand, the end face of the flange segment can be limited at the aforementioned limiting shaft segment 41 to form a limiting position for the initial position. It should be understood that the radial dimension of this flange segment is the largest of the radial dimensions of the movable nut 5, which can achieve a large-area contact between the movable nut 5 and the limiting shaft segment 41, which is beneficial to achieving uniform force distribution on the movable nut 5.

[0111] Optionally, the cross-section of the guide post 91 can be one of a circle, a rectangle, or a triangle.

[0112] Optionally, the positions of the guide post 91 and the guide groove 92 can be interchanged. Specifically, the anti-rotation structure 9 includes multiple one-to-one corresponding guide posts 91 and guide grooves 92; the multiple guide posts 91 are spaced apart circumferentially along the movable screw nut 5, and the guide posts 91 extend axially along the movable screw nut 5; multiple guide grooves 92 are spaced apart circumferentially along the first mounting cavity 11 within the hydraulic integrated block 1; wherein, when the movable screw nut 5 moves along the rotating screw 4, the guide post 91 is slidably connected within the corresponding guide groove 92.

[0113] Please see Figure 1In some possible embodiments, the motor assembly 2 includes a motor housing 21, and the interior of the motor housing 21 is provided with a partition plate 23 arranged perpendicular to the first direction. The partition plate 23 divides the inner cavity of the motor housing 21 into a first cavity 24 and a second cavity 25 arranged at intervals along the first direction. The first cavity 24 has an opening facing the hydraulic integrated block 1. A hollow rotor 22 is installed in the second cavity 25. One end of the servo cylinder 3 is placed in the hollow rotor 22, and the other end passes through the partition plate 23 and enters the first cavity 24 to connect with the hydraulic integrated block 1.

[0114] The partition plate 23 divides the interior of the motor housing 21 into a first cavity 24 and a second cavity 25. The second cavity 25 is used to install the hollow rotor 22. The cooling oil in the area where the hollow rotor 22 is located can be blocked by the partition plate 23. The part of the servo cylinder 3 that passes through the partition plate 23 is connected to the hydraulic integrated block 1. Even if there is oil leakage at the connection between the servo cylinder 3 and the hydraulic integrated block 1, it will be effectively intercepted by the partition plate 23, thereby avoiding affecting the hollow rotor 22 of the motor assembly 2. The partition plate 23 can effectively ensure the separation between the hollow rotor 22 area and the servo cylinder 3 connection area, avoid mutual interference or contamination, and help ensure the safety of overall operation.

[0115] Furthermore, the partition plate 23 is provided with a limiting protrusion ring protruding towards the hollow rotor 22, and a third bearing 27 is provided between the limiting protrusion ring and the outer peripheral wall of the hollow rotor 22. The third bearing 27 and the limiting protrusion 231 are used to achieve radial limiting of the hollow rotor 22. A second bearing 26 is provided at the other end of the hollow rotor 22 away from the partition plate 23. The second bearing 26 is used to achieve radial limiting of the other end of the hollow rotor 22 without affecting the rotation of the hollow rotor 22.

[0116] The servo cylinder 3 and the hydraulic integrated block 1 can be connected by a flange, a threaded connection, or a press-fitted retaining ring, or other methods that can be selected in the art. Specifically, the connection method can be selectively set according to actual needs, and is not limited here.

[0117] One end of the servo cylinder 3 is placed inside the hollow rotor 22 to integrate the servo cylinder 3 with the hollow rotor 22 of the motor assembly 2. The other end of the servo cylinder 3 passes through the partition plate 23 and enters the first cavity 24 to connect the servo cylinder 3 with the hydraulic integrated block 1.

[0118] Since the opening of the first cavity 24 faces the hydraulic integrated block 1, the part of the servo cylinder 3 that passes through the first partition can be directly connected to the side of the hydraulic integrated block 1 exposed at the opening of the first cavity 24. The installation path is short, and the hydraulic integrated block 1 can be directly connected to the servo cylinder 3 without the need for intermediate adapters.

[0119] Please see Figure 1In some embodiments, the hydraulic integrated block 1 is provided with an oil guide channel 12 for communicating with an external oil circuit; the portion of the servo cylinder 3 that extends into the first cavity 24 is provided with an extension 31 that extends radially along the servo cylinder 3, and the extension 31 is provided with a first oil passage 32, one end of the first oil passage 32 is connected to the oil guide channel 12, and the other end is connected to the inner cavity of the servo cylinder 3.

[0120] The oil guide channel 12 is used to guide the external oil circuit to the servo cylinder 3 through the first oil passage 32, so as to realize the flow of external oil to the servo cylinder 3; by setting the extension 31, the contact area between the servo cylinder 3 and the hydraulic integrated block 1 is expanded, which is conducive to setting the first oil passage 32 on the extension 31, thereby realizing the introduction of oil into the servo cylinder 3.

[0121] It should be noted that the first oil passage 32 is used to guide the oil to the inner cavity of the servo cylinder 3. The interface between the first oil passage 32 and the inner cavity of the servo cylinder 3 is defined as the oil guide interface. The first seal 33 is used to prevent the oil from entering the first mounting cavity 11 from the inner cavity of the servo cylinder 3. Therefore, the first seal 33 is set on the open side of the servo cylinder 3 that connects with the first mounting cavity 11. The oil guide interface can be selectively set at a position away from the open side of the servo cylinder 3. That is, in the first direction, the distance from the first seal 33 to the open side of the servo cylinder 3 is less than the distance from the oil guide interface to the open side of the servo cylinder 3.

[0122] The extension 31 on the servo cylinder 3 is located at the part of the servo cylinder 3 that extends into the first cavity 24 of the motor assembly 2, that is, at one end near the hydraulic integrated block 1, and extends radially along the servo cylinder 3. The extension 31 can serve as an interface for oil circuit transfer, and can also serve as a connection structure between the servo cylinder 3 and the hydraulic integrated block 1.

[0123] For example, one end of the extension 31 abuts against the hydraulic integrated block 1, and a second seal 34 is provided at the connecting end of the first oil passage 32 and the oil guide channel 12 to prevent oil leakage.

[0124] Optionally, the second sealing element 34 provided in this embodiment can be one or more of an O-ring, a gasket, a metal gasket, or a sealing strip. Similarly, the first sealing element 33, the third sealing element 7, and the fourth sealing element 8 can all refer to the structure of the second sealing element 34 or be selected according to actual needs.

[0125] Since the extension 31 extends radially from the outer peripheral wall of the servo cylinder 3, the first oil passage 32 also extends radially into the inner cavity of the servo cylinder 3. In this embodiment, the first oil passage 32 directly connects the oil guide channel 12 and the inner cavity of the servo cylinder 3, eliminating the need for external oil pipes, reducing leakage points, and improving reliability.

[0126] Based on the same inventive concept, this application also provides a vehicle that includes the above-described automotive brake servo pressure build-up assembly.

[0127] The vehicle provided in this application, having included the aforementioned automotive brake servo pressure build-up assembly, possesses all the beneficial effects of the aforementioned automotive brake servo pressure build-up assembly. It can improve the space utilization rate of the automotive brake servo pressure build-up assembly, achieve effective space utilization, and enhance the overall integration of the vehicle, thus contributing to the lightweighting of the automotive brake servo pressure build-up assembly.

[0128] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An automotive brake servo pressure build-up assembly, characterized in that, include: The hydraulic integrated block (1) has a first mounting cavity (11) extending in a first direction; A motor assembly (2) is connected to one side of the hydraulic integrated block (1); the motor assembly (2) has a hollow rotor (22) for outputting power; A servo cylinder (3) is connected to the hydraulic integrated block (1); the inner cavity of the servo cylinder (3) is coaxial with the hollow rotor (22) and communicates with the first mounting cavity (11) along the first direction; and Rotate the lead screw (4) and pass it through the first mounting cavity (11) and the inner cavity of the servo cylinder (3) along the first direction, and one end passes through the inner cavity of the servo cylinder (3) and is poweredly connected to the hollow rotor (22); The servo cylinder (3) is placed inside the motor assembly (2) and partially extends into the hollow rotor (22). The rotating lead screw (4) is screwed with a movable lead screw nut (5) on the part of the first mounting cavity (11). A movable piston (51) is connected to the movable lead screw nut (5). The movable lead screw nut (5) is used to drive the movable piston (51) to slide along the first direction in the inner cavity of the first mounting cavity (11) and the servo cylinder (3).

2. The automotive brake servo pressure build-up assembly as described in claim 1, characterized in that, The automotive brake servo pressure build-up assembly also includes an electronic control unit (6) connected to the other side of the hydraulic integrated block (1), and the electronic control unit (6) is provided with an angle sensor chip (61) on the opposite side of the hydraulic integrated block (1); The first mounting cavity (11) has two ends that pass through the hydraulic integrated block (1) along the first direction. One end of the rotating screw (4) passes through one of the through ends of the first mounting cavity (11) and is poweredly connected to the hollow rotor (22). The other end of the rotating screw (4) extends to the other through end of the first mounting cavity (11) and is connected to the electrical control unit (6) with an angle detection element. The angle detection element is electromagnetically connected to the angle sensor chip (61). The angle sensor chip (61) is used to receive the sensing signal of the angle detection component and transmit the rotation speed information of the lead screw (4) to the electronic control unit (6).

3. The automotive brake servo pressure build-up assembly as described in claim 1, characterized in that, The rotating lead screw (4) is provided with a limiting shaft section (41) at one end inside the hydraulic integrated block (1), and the limiting shaft section (41) is rotatably connected to the hydraulic integrated block (1); The movable nut (5) and the movable piston (51) reciprocate between the limiting shaft section (41) and the bottom of the servo cylinder (3); During the reciprocating motion of the moving nut (5) and the moving piston (51), the moving piston (51) is always partially inserted into the servo cylinder (3), and a first seal (33) is connected between the inserted end of the moving piston (51) and the inner wall of the servo cylinder (3).

4. The automotive brake servo pressure build-up assembly as described in claim 3, characterized in that, The limiting shaft segment (41) is rotatably connected to the first mounting cavity (11) via a first bearing (46), and the first bearing (46) is limited at the through end of the first mounting cavity (11) by a sleeve assembly.

5. The automotive brake servo pressure build-up assembly as described in claim 1, characterized in that, The rotating lead screw (4) includes: A threaded section (42) is placed in the first mounting cavity (11) and extends along the first direction to the inner cavity of the servo cylinder (3); the threaded section (42) is threadedly connected to the movable nut (5); The sliding section (43) is placed in the inner cavity of the servo cylinder (3) and is integrally connected with the threaded section (42); the sliding section (43) is covered with a steel pipe (45), and the steel pipe (45) is slidably connected to one end of the moving piston (51) that extends into the servo cylinder (3); The connecting section (44) is integrally connected to the sliding section (43) at one end and extends out of the servo cylinder (3) at the other end, and is poweredly connected to the hollow rotor (22).

6. The automotive brake servo pressure build-up assembly as described in claim 1 or 3, characterized in that, The automotive brake servo pressure build-up assembly also includes: An anti-rotation structure (9) is placed in the first mounting cavity (11) and connected between the movable nut (5) and the hydraulic integrated block (1); the anti-rotation structure (9) extends along the first direction; The anti-rotation structure (9) is used to prevent the moving nut (5) and the moving piston (51) from rotating.

7. The automotive brake servo pressure build-up assembly as described in claim 6, characterized in that, The anti-rotation structure (9) includes multiple one-to-one corresponding guide posts (91) and guide grooves (92); Multiple guide grooves (92) are arranged circumferentially along the movable nut (5), and the guide grooves (92) extend axially along the movable nut (5); Multiple guide posts (91) are arranged circumferentially within the hydraulic integrated block (1) along the first mounting cavity (11); When the movable screw nut (5) and the movable piston (51) move along the rotating screw (4), the guide post (91) is slidably connected in the corresponding guide groove (92).

8. The automotive brake servo pressure build-up assembly as described in claim 1, characterized in that, The motor assembly (2) includes: The motor housing (21) has a partition plate (23) arranged perpendicular to the first direction inside. The partition plate (23) divides the inner cavity of the motor housing (21) into a first cavity (24) and a second cavity (25) arranged at intervals along the first direction. The first cavity (24) has an opening facing the hydraulic integrated block (1). The hollow rotor (22) is installed in the second cavity (25). One end of the servo cylinder (3) is placed in the hollow rotor (22), and the other end passes through the partition plate (23) and enters the first cavity (24) to connect with the hydraulic integrated block (1).

9. The automotive brake servo pressure build-up assembly as described in claim 8, characterized in that, The hydraulic integrated block (1) is provided with an oil guide channel (12) for communicating with the external oil circuit; The portion of the servo cylinder (3) that extends into the first cavity (24) is provided with an extension (31) that extends radially along the servo cylinder (3). The extension (31) is provided with a first oil passage (32). One end of the first oil passage (32) is connected to the oil guide channel (12), and the other end is connected to the inner cavity of the servo cylinder (3).

10. A vehicle, characterized in that, Including the automotive brake servo pressure build-up assembly as described in any one of claims 1-9.

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