Actuating mechanism for vehicle braking and vehicle

Abstract

The invention discloses an executing mechanism for vehicle braking and a vehicle, the executing mechanism for vehicle braking comprises a lead screw, a lead screw nut and a braking top block, the lead screw is screwed with the lead screw nut, the braking top block is fixedly connected with the lead screw nut, one axial end of the lead screw is provided with an anti-rotation check block, and the other axial end of the lead screw is provided with a locking block; the anti-rotation check block abuts against the brake top block in the axial direction of the lead screw and can abut against the brake top block in the rotation direction of the lead screw when the lead screw rotates to the limiting position relative to the lead screw nut, and therefore the lead screw is prevented from excessively rotating. According to some embodiments disclosed by the utility model, the lead screw and the lead screw nut which are screwed with each other as well as the brake top block fixedly connected with the lead screw nut are arranged, and the anti-rotation stop block is arranged on the lead screw, so that the anti-rotation stop block can be propped against the brake top block at a stroke limit position, and the operation reliability of the actuating mechanism can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to the technical field of vehicle braking. More particularly, the present disclosure relates to an actuator for vehicle braking and a vehicle. BACKGROUND

[0002] In the process of the automobile industry deep transformation towards intelligence and electrification, the transmission reliability and safety redundancy level of the electromechanical brake (EMB) system, as the core execution unit of braking, directly determine the vehicle braking performance and driving safety. In the power transmission chain of the EMB system, the screw rod is a key core component for realizing the braking function. Its core role is to accurately convert the rotational motion output by the driving motor into the linear displacement required by the brake caliper body, thereby ensuring the braking gap control accuracy and braking responsiveness, and is an important carrier for maintaining the system braking efficiency. However, the existing screw rod design scheme has significant technical pain points: when the screw rod runs to the limit position, its travel limit completely relies on the electronic limit signal to achieve control. This method is easily affected by factors such as control signal transmission delay and electromagnetic environment interference under extreme working conditions, resulting in the screw rod being unable to stop moving in time, and further generating an over-travel mechanical impact, which not only damages the transmission accuracy of the screw rod, but also may cause the screw rod and associated components to jam and fail, seriously threatening the overall reliability of the braking system.

[0003] Therefore, there is an urgent need to provide an actuator for vehicle braking and a vehicle in order to improve the operation reliability of the actuator for vehicle braking. SUMMARY

[0004] In order to at least solve one or more of the above-mentioned technical problems, the present disclosure proposes an actuator for vehicle braking and a vehicle in various aspects.

[0005] In a first aspect, the present disclosure provides an actuator for vehicle braking, comprising a screw rod, a screw nut, and a brake top block, the screw rod being screwed with the screw nut, the brake top block being fixedly connected with the screw nut, one axial end of the screw rod being provided with an anti-rotation stop block, the anti-rotation stop block abutting against the brake top block along the axial direction of the screw rod and being capable of abutting against the brake top block in the rotation direction of the screw rod when the screw rod rotates to a limit position relative to the screw nut, so as to prevent the screw rod from rotating excessively.

[0006] In some embodiments, the brake top block comprises a brake top plate, the brake top plate being sealingly connected with one axial end of the screw nut.

[0007] In some embodiments, the anti-rotation stop block is arranged at the radial outer edge of the screw rod.

[0008] In some embodiments, the brake top plate is provided with an anti-rotation protrusion protruding towards the screw rod along the axial direction of the screw rod.

[0009] In some embodiments, a housing is further included, which is arranged radially outside the nut, and the housing is connected with the nut in a rotation-preventing manner.

[0010] In some embodiments, a guide pin is arranged on the radially inner side of the housing, and a long strip-shaped guide groove extending along the axial direction of the nut is arranged on the radially outer wall of the nut, and the guide pin cooperates with the guide groove.

[0011] In some embodiments, an annular elastic sealing member is further arranged on the inner side of the housing, the radially inner side of the elastic sealing member cooperates with the nut, the radially outer side of the elastic sealing member cooperates with the inner side of the housing, and the elastic sealing member is elastically deformable along its axial direction.

[0012] In some embodiments, a manually operated end (31) is arranged on one axial end of the screw, and protrudes through the nut.

[0013] In some embodiments, the manually operated end comprises an axially recessed inner hexagonal tool interface.

[0014] In some embodiments, the screw and the nut are in a ball screw structure.

[0015] In a second aspect, the present disclosure provides a vehicle comprising the actuator for vehicle braking according to the first aspect and the embodiments.

[0016] By means of the actuator for vehicle braking and the vehicle as provided above, the embodiments of the present disclosure can improve the operation reliability of the actuator by arranging a screw and a nut that are screwed with each other, a brake block fixedly connected with the nut, and a rotation-preventing stopper arranged on the screw, so that the rotation-preventing stopper can abut against the brake block at the limit position of the stroke, thereby improving the operation reliability of the actuator. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: Figure 1 An exemplary perspective view of the actuator for vehicle braking of some embodiments of the present disclosure is shown; Figure 2 An exemplary cross-sectional view of the actuator for vehicle braking of some embodiments of the present disclosure is shown; Figure 3 An exemplary exploded view of the assembly of the screw, the nut and the brake block of the actuator for vehicle braking of some embodiments of the present disclosure is shown; Figure 4An exemplary partial enlarged view of an axial end of a lead screw of an actuator for vehicle braking of some embodiments of the present disclosure is shown. Figure 5 An exemplary sectional view of an actuator for vehicle braking of some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present disclosure will be apparently and completely described below with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present disclosure.

[0019] It should be understood that the terms "comprising" and "including" used in the specification and claims of the present disclosure indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0020] It should also be understood that the terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. As used in the specification and claims of the present disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should be further understood that the term "and / or" used in the specification and claims of the present disclosure means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0021] As used in the specification and claims of this document, the term "if" can be interpreted as meaning "when" or "once" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted as meaning "once it is determined" or "in response to a determination" or "upon detecting [a described condition or event]" or "in response to detecting [a described condition or event]" depending on the context.

[0022] The embodiments of the present disclosure provide an actuator for vehicle braking, which sets a lead screw and a lead screw nut in mutual screwing, and a brake top block fixedly connected with the lead screw nut, and sets an anti-rotation stop block on the lead screw, so that the anti-rotation stop block can abut against the brake top block at a stroke limit position, and the operation reliability of the actuator can be improved.

[0023] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0024] Referring to Figure 1 and Figure 2 , Figure 1 shows an example perspective view of an actuator for vehicle braking according to some embodiments of the present disclosure, Figure 2 shows an example cross-sectional view of an actuator for vehicle braking according to some embodiments of the present disclosure.

[0025] In this embodiment, the actuator for vehicle braking comprises a lead screw 3, a lead screw nut 4 and a brake block 5. The lead screw 3 is screwed with the lead screw nut 4, and the brake block 5 is fixedly connected with the lead screw nut 4. One axial end of the lead screw 3 is provided with an anti-rotation stopper 32, which abuts against the brake block 5 along the axial direction of the lead screw 3, and can abut against the brake block 5 along the rotation direction of the lead screw 3 when the lead screw 3 rotates relative to the lead screw nut 4 to the limit position, so as to prevent the lead screw 3 from over-rotation.

[0026] Specifically, the actuator for vehicle braking can be arranged at the vehicle wheel, for rotating the lead screw 3 relative to the lead screw nut 4 when activated, and driving the brake block 5 to abut against the brake pad or other braking device to achieve braking. The lead screw nut 4 can be driven by the lead screw 3 when the lead screw 3 rotates, so as to move relative to the lead screw 3 along the axial direction of the lead screw 3. The brake block 5 and the lead screw nut 4 are fixedly connected with each other by interference fit and laser welding, and the brake block 5 moves synchronously along the axial direction of the lead screw 3 when the lead screw nut 4 moves, so as to abut against or move away from the brake mechanism. The lead screw 3 is provided with an anti-rotation stopper 32 protruding radially outward, which is located at one axial end of the lead screw 3. The brake block 5 and the anti-rotation stopper 32 can be precisely machined from high-strength alloy steel, so that a rigid contact surface is formed between the brake block 5 and the anti-rotation stopper 32, and the two can withstand high-strength impact without plastic deformation.

[0027] When the lead screw 3 rotates, the anti-rotation stopper 32 rotates around the axis of the lead screw 3 under the driving of the lead screw 3. When the brake block 5 is driven to move to the preset limit position, the anti-rotation stopper 32 also rotates to a certain angle at the same time, so that the anti-rotation stopper 32 abuts against the brake block 5 along the rotation direction thereof. Thus, the lead screw 3 is stopped at the limit position, so as to achieve mechanical limit redundancy protection. That is, a hard stop structure is arranged at the end of the lead screw 3, a physical protection barrier is constructed at the limit position, and over-rotation phenomenon (i.e. the so-called "crushing" phenomenon) of the lead screw 3 at the limit position due to inertia or control error is avoided.

[0028] Referring to Figure 2 and Figure 3 , Figure 3An exemplary exploded view of a screw, a screw nut and an assembly of a brake block for an actuator of a vehicle brake according to some embodiments of the present disclosure is shown. In this embodiment, the brake block 5 comprises a brake plate 52 which is sealingly connected to one axial end of the screw nut 4. The screw nut 4 is substantially formed as a cylinder, and one end of the screw 3 provided with the anti-rotation stopper 32 is disposed on the radially inner side of the screw nut 4. The brake plate 52 is also provided as a circular plate corresponding to the shape of the axial end surface of the screw nut 4, and can be in interference fit with the end opening of the screw nut 4, and further fixedly connected to the screw nut 4 by welding, while sealing the axial end opening of the screw nut 4. Thus, the brake plate 52 is fixed relative to the screw nut 4, while also enhancing the sealing of the screw nut 4, reducing the probability of dust or foreign matter entering the interior of the screw nut 4.

[0029] Further or alternatively, the anti-rotation stopper 32 is disposed on the radially outer edge of the screw 3. By disposing the anti-rotation stopper 32 on the radially outer edge of the screw 3, the anti-rotation stopper 32 can move along a larger diameter rotation track when the screw 3 rotates, and after the screw 3 rotates by a certain angle, the anti-rotation stopper 32 moves a longer distance, which helps to more accurately control the angle of rotation of the anti-rotation stopper 32 when it is stopped by adjusting the position of the anti-rotation stopper 32 on the screw 3, thereby improving positioning accuracy. In addition, in the embodiments shown in Figure 2 and Figure 3 , the brake plate 52 is provided with an anti-rotation protrusion 51 protruding towards the screw 3 along the axial direction of the screw 3. The anti-rotation protrusion 51 can be used to abut the anti-rotation stopper 32 in its rotation direction to stop the screw 3. By providing the anti-rotation protrusion 51, the anti-rotation stopper 32 can be precisely stopped without affecting the structural strength of the brake block 5.

[0030] As can be understood by those skilled in the art, although the above describes a scheme in which the brake block 5 is provided as a brake plate 52 sealing the axial end of the screw nut 4, and the anti-rotation protrusion 51 protruding from the brake plate 52, the present disclosure does not limit the specific structure of the brake block 5 and the anti-rotation stopper 32. For example, in some embodiments not shown, an arc-shaped groove can be provided on the brake block 5, and the anti-rotation stopper 32 protrudes from the end of the screw 3 towards the side of the brake block 5 and at least partially extends into the arc-shaped groove. Thus, when the screw 3 rotates, the anti-rotation stopper 32 can rotate and move along the arc-shaped groove, and abut the edge wall of the groove end of the arc-shaped groove at the limit position to achieve stopping. Alternatively, the brake plate 52 can be provided as a non-sealing structure, such as providing a grease injection hole on the brake plate 52 to enable injection of lubricating grease into the interior of the screw nut 4, etc.

[0031] Again referring to Figure 2 andFigure 3 In this embodiment, the housing 6 is further provided on the radial outer side of the screw nut 4, and the housing 6 is connected with the screw nut 4 in a rotation-proof manner. The housing 6 is a structural member for connecting the actuating mechanism with the vehicle, and the housing 6 internally accommodates the screw 3, the screw nut 4 and the brake block 5. The side of the housing 6, on which the brake block 5 is arranged, can be further provided with a brake mechanism 90, such as a brake pad, which is arranged to abut against the brake block 5 in the axial direction of the screw 3. The housing 6 can protect and seal the screw nut 4 and the screw 3 inside the housing 6, so as to reduce the impact of impact or foreign matter on the actuating mechanism. Further or alternatively, the radial inner side of the housing 6 is provided with a guide pin (not shown), and the radial outer wall of the screw nut 4 is provided with an elongated guide groove 41 extending in the axial direction of the screw nut 4, and the guide pin cooperates with the guide groove 41. Through the cooperation of the guide pin and the guide groove 41, the screw nut 4 and the brake block 5 can move linearly in the axial direction of the screw 3 inside the housing 6, so that the limiting mechanism formed has a simple and reliable structure and is easy to assemble, and occupies a smaller space inside the housing 6, which is conducive to the miniaturization of the actuating mechanism.

[0032] In this embodiment, the housing 6 is further provided with an annular elastic seal 7 on the inner side, the radial inner side of the elastic seal 7 is connected with the screw nut 4 in a cooperative manner, the radial outer side of the elastic seal 7 is connected with the inner side of the housing 6 in a cooperative manner, and the elastic seal 7 can be elastically deformed in the axial direction. By providing the elastic seal 7, the sealing performance of the inside of the housing 6 is further improved, the probability of dust or foreign matter entering the inside of the housing 6 and affecting the movement of the screw nut 4 is reduced, and the probability of leakage of lubricating grease in the housing 6 is reduced, thereby improving the overall operation stability of the actuating mechanism. The side of the housing 6, which is away from the brake block 5 in the axial direction of the screw 3, is further provided with a rear cover 1, the rear cover 1 is provided with an axial end hole for exposing the axial end of the screw 3, and a rotary seal ring 2 is further arranged between the rear cover 1 and the screw 3, so as to further improve the sealing performance of the inside of the housing 6.

[0033] Meanwhile, see Figures 1 to 4 , Figure 4 An exemplary partial enlarged view of the axial end of the screw of the actuating mechanism for vehicle braking according to some embodiments of the present disclosure is shown. In this embodiment, one axial end of the screw 3 is provided with a manually operated end 31 and is exposed through the screw nut 4. By providing the manually operated end 31, when the actuating mechanism fails due to power failure or other faults, causing the brake mechanism to be locked and unable to act, maintenance personnel can manually adjust and drive the screw 3 to rotate, thereby moving the screw nut 4 away from the brake mechanism. Further or alternatively, the manually operated end 31 includes an axially recessed inner hexagonal tool interface. This allows the maintenance personnel to rotate and drive the screw 3 by using a commonly used inner hexagonal wrench, further reducing the operation difficulty.

[0034] By setting the manual operation end 31, man-machine cooperative emergency redundancy design can be realized. That is, when the vehicle has an accident or failure, causing the power source or electronic control system of the actuator to fail, by integrating a standardized inner hex tool interface at the lead screw drive end and using a countersunk process to ensure a smooth surface, manual reset operation is facilitated. Compared with the prior art reset scheme of forcibly twisting the lead screw 3 by an external clamping tool, the structure optimization of the manual operation end 31 can significantly reduce the torque required for manual reset, and the operator does not need to disassemble the components to quickly intervene, greatly shortening the fault response time and improving the rescue speed. The combination of the manual operation end 31, the brake top block 5, and the anti-rotation stop block 32 on the lead screw 3 realizes a "mechanical safety double insurance" innovative architecture that meets the stringent requirements of EMB (electronic mechanical brake) systems for transmission reliability and safety redundancy. Through the "mechanical safety double insurance" design, a man-machine emergency device independent of the electronic system is established, ensuring rapid intervention capability in emergency working conditions, and the intrinsic safety characteristics of the transmission system are strengthened, making it particularly suitable for high-precision transmission scenarios such as new energy vehicle electronic braking and industrial robots that require zero failure rate. Through man-machine cooperative emergency redundancy design and precise hard limit protection innovation, the emergency response capability and intrinsic safety characteristics of the EMB system are significantly improved, providing an innovative solution for mechatronic system reliability design.

[0035] Referring to Figure 2 and Figure 5 , Figure 5 An exemplary cross-sectional view of an actuator for vehicle braking is shown in accordance with some embodiments of the present disclosure. In Figure 2 , the lead screw nut 4 and the lead screw 3 of the actuator for vehicle braking can be configured as a ball screw structure. Unlike the embodiment shown in Figure 2 , in the embodiment shown in Figure 5 , the lead screw nut 4 and the lead screw 3 can be configured as a planetary roller screw structure. In this embodiment, by setting the size of the inner cavity of the housing 6, and making the interface sizes (such as lead screw stroke, mounting size, lead screw shaft and nut outer shape size, etc.) between the nut 4 and the lead screw 3 and other related components consistent, both ball screw and planetary roller screw structures can be adapted, so that by flexibly replacing the lead screw structure, more different use requirements can be met, and the working condition application range of the actuator can be improved.

[0036] In some other embodiments, the present disclosure also provides a vehicle including a main body of the vehicle, and one or more actuators for vehicle braking according to the embodiments of the present disclosure. Each actuator can be arranged at a wheel of the vehicle to brake the wheel.

[0037] While several embodiments of the disclosure have been shown and described herein, it is to be understood that the embodiments are merely exemplary. Numerous changes, substitutions and equivalents can occur to those skilled in the art without departing from the spirit and scope of the disclosure. It should be understood that various alternatives to the embodiments of the disclosure described herein can be employed in practicing the disclosure. It is intended that the following claims define the scope of the disclosure and that methods equivalent to those shown and described herein can be utilized without departing from the spirit and scope of the disclosure.

Claims

1. An actuator for vehicle braking, characterized in that, The device includes a lead screw (3), a lead screw nut (4), and a brake block (5). The lead screw (3) is screwed into the lead screw nut (4), and the brake block (5) is fixedly connected to the lead screw nut (4). An anti-rotation stop (32) is provided at one axial end of the lead screw (3). The anti-rotation stop (32) abuts against the brake block (5) along the axial direction of the lead screw (3), and can abut against the brake block (5) along the rotation direction of the lead screw (3) when the lead screw (3) rotates to the limit position relative to the lead screw nut (4), so as to prevent the lead screw (3) from rotating excessively.

2. The actuator according to claim 1, characterized in that, The brake top block (5) includes a brake top plate (52), which is sealed to one axial end of the lead screw nut (4).

3. The actuator according to claim 2, characterized in that, The anti-rotation stop (32) is located on the radial outer edge of the lead screw (3).

4. The actuator according to claim 3, characterized in that, The brake top plate (52) is provided with an anti-rotation protrusion (51) that protrudes toward the lead screw (3) along the axial direction of the lead screw (3).

5. The actuator according to claim 1, characterized in that, It also includes a housing (6), which is disposed on the radially outer side of the lead screw nut (4), and the housing (6) is connected to the lead screw nut (4) in an anti-rotation manner.

6. The actuator according to claim 5, characterized in that, A guide pin is provided on the radial inner side of the housing (6), and an elongated guide groove (41) extending along the axial direction of the lead screw nut (4) is provided on the radial outer wall of the lead screw nut (4). The guide pin cooperates with the guide groove (41).

7. The actuator according to claim 5, characterized in that, The inner side of the housing (6) is also provided with an annular elastic seal (7). The inner radial side of the elastic seal (7) is connected to the lead screw nut (4), and the outer radial side of the elastic seal (7) is connected to the inner side of the housing (6). The elastic seal (7) can be elastically deformed along its axial direction.

8. The actuator according to claim 1, characterized in that, A manual operation end (31) is provided on one axial end of the lead screw (3) and protrudes through the lead screw nut (4).

9. The actuator according to claim 8, characterized in that, The manual operating end (31) includes an axially recessed internal hexagonal tool interface.

10. The actuator according to claim 1, characterized in that, The lead screw (3) and lead screw nut (4) are ball screw structures.

11. A vehicle, characterized in that, Includes an actuator for vehicle braking according to any one of claims 1 to 10.

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