Brake caliper assembly and vehicle

Abstract

This application provides a brake caliper assembly and a vehicle, relating to the field of vehicle technology, which can reduce the space occupied by the brake caliper assembly. The brake caliper assembly includes a caliper holder, a caliper body, a lead screw, friction pads, and a piston. The lead screw is rotatably connected to the caliper body about its own axis. The friction pads are circumferentially connected to the lead screw and mutually restrained by the caliper holder. Along the axial direction of the lead screw, the friction pads are slidably connected to the caliper holder, forming a limiting cavity. The piston includes a piston body and a limiting protrusion formed on the piston body. The piston body is helically connected to the lead screw and abuts against the friction pads along the axial direction. The engagement between the limiting cavity and the limiting protrusion restricts the piston from rotating synchronously with the lead screw. In this way, the outer surface of the piston does not need to have a groove for engaging with the protrusion of the caliper body; the piston only needs a sealing section to engage with the first sealing ring. The length of the piston along the axial direction of the lead screw can be shortened, thus shortening the length of the brake caliper assembly along the axial direction of the lead screw, which helps to reduce the space occupied by the brake caliper assembly.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a brake caliper assembly and a vehicle. Background Technology

[0002] The brake caliper assembly is the actuator of a disc brake system. The friction pads of the brake caliper assembly apply clamping force to the brake disc, generating friction. This friction converts the vehicle's kinetic energy into heat energy, achieving deceleration and stopping. Electronic brake calipers generally include a drive unit and a lead screw and nut mechanism. The drive unit drives the lead screw to rotate around its own axis relative to the caliper body, causing the nut to translate axially relative to the caliper body. This, in turn, causes the nut to drive the friction pads to translate relative to the caliper body, thus applying force to the brake disc.

[0003] However, in related technologies, the length of the brake caliper assembly along the lead screw is too large, resulting in a large space occupation for the brake caliper assembly. Utility Model Content

[0004] This application provides a brake caliper assembly and a vehicle that can reduce the space occupied by the brake caliper assembly.

[0005] In a first aspect, this application provides a brake caliper assembly, which includes a caliper frame, a caliper body, a lead screw, a friction pad, and a piston. The caliper body is disposed on the caliper frame, the lead screw is rotatably connected to the caliper body about its own axis, the friction pad is circumferentially connected to the lead screw and mutually restrained by the caliper frame, and slidably connected to the caliper frame along the axial direction of the lead screw, forming a restraining cavity. The piston includes a piston body and a restraining protrusion formed on the piston body, the piston body is helically connected to the lead screw, the piston body abuts against the friction pad along the axial direction, the restraining protrusion cooperates with the restraining cavity, and the inner surface of the restraining cavity mutually restrains the restraining protrusion along the circumferential direction of the lead screw.

[0006] By mutually limiting the inner surface of the limiting cavity and the limiting protrusion along the circumference of the lead screw, the piston and friction plate are mutually limited along the circumference of the lead screw, thereby limiting the piston and clamp along the circumference. In this way, during the rotation of the lead screw relative to the clamp body, the piston is less likely to rotate synchronously with the lead screw, but instead translates relative to the clamp body along the axial direction of the lead screw, thus causing the friction plate to translate relative to the clamp body. This application restricts the piston's synchronous rotation with the lead screw through the cooperation of the limiting cavity and the limiting protrusion, eliminating the need for a groove on the piston's outer surface to engage with the protrusion of the clamp body. This ensures that during the piston's translational movement relative to the clamp body, the first sealing ring surrounding the piston remains in close contact with the piston's outer surface, avoiding the risk of the groove moving to the first sealing ring and causing a deterioration in sealing performance. Compared to related technologies that avoid deterioration of sealing performance by having the nut have a longer sealing portion on the side of the groove near the seal, with the length of the sealing portion being greater than or equal to the length of the groove, and the sealing portion always engaging with the seal during the movement of the nut, this application does not require a groove. It is sufficient for the piston to have a sealing section that engages with the first sealing ring. The length of the piston along the screw axial direction can be shortened, which in turn shortens the length of the brake caliper assembly along the screw axial direction, thus reducing the space occupied by the brake caliper assembly.

[0007] Moreover, in this application, during the axial translational movement of the piston relative to the caliper, the friction plate moves together. In this way, during the piston movement, the limiting protrusion and the inner surface of the limiting cavity are less likely to slide relative to each other. Compared with the related technology that restricts the piston to rotate with the screw by sliding cooperation between the protrusion and the groove of the caliper body, this application can reduce the frictional damage of the piston and is conducive to improving the reliability and durability of the brake caliper assembly.

[0008] In some possible implementations of this application, the piston body is located on the back side of the friction plate. The limiting cavity has an opening formed on the back side of the friction plate. The limiting protrusion protrudes in a direction opposite to the orientation of the opening, and the limiting protrusion extends into the limiting cavity through the opening to engage with the limiting cavity.

[0009] By forming the opening on the back side of the friction plate, the distance between the opening and the piston body is reduced, allowing the limiting protrusion formed on the piston body to reach the opening with a relatively small protrusion length and extend into the limiting cavity through the opening. By making the direction of the limiting protrusion opposite to the orientation of the opening, the limiting protrusion does not need to have a large bend to extend into the limiting cavity through the opening. This improves the rigidity of the limiting protrusion, enhances the ease of manufacturing the limiting protrusion, and reduces material waste.

[0010] In some possible implementations of this application, the outer wall of the friction plate is recessed to form a limiting groove, and the limiting cavity is the inner cavity of the limiting groove. The limiting groove penetrates the friction plate in a direction opposite to the orientation of the friction plate, forming an opening.

[0011] Thus, the limiting cavity is located at the outer edge of the friction pad. It is understood that during braking, the middle of the friction pad bears greater force than the outer edge. This application positions the limiting cavity at the outer edge of the friction pad, avoiding the middle, which helps to ensure higher strength and rigidity in the middle of the friction pad, making it less prone to damage under greater force. By extending the limiting groove through the friction pad in a direction opposite to its orientation, forming an opening, with the opening facing the side of the friction pad closer to the piston body, the limiting protrusion does not need to have a large bend or an excessively long protrusion to extend into the limiting cavity through the opening. This improves the rigidity of the limiting protrusion, enhances its manufacturing convenience, and reduces material waste.

[0012] In some possible implementations of this application, the orientation of the opening is opposite to the orientation of the friction plate. Along the axial direction of the lead screw, a limiting protrusion is formed on the end face of the piston body near the friction plate.

[0013] By forming a limiting protrusion along the axial direction of the lead screw on the end face of the piston body near the friction plate, the distance between the opening and the bottom of the limiting protrusion is relatively short. This allows the limiting protrusion to reach the opening with a smaller protrusion length, which improves the rigidity of the limiting protrusion, enhances its manufacturing convenience, and reduces material waste. Furthermore, by oriented the opening opposite to the friction plate, the limiting protrusion can extend into the limiting cavity without significant bending, further improving its rigidity, manufacturing convenience, and material waste.

[0014] In some possible implementations of this application, the piston body includes a sleeve and a cover. The sleeve is fitted onto a lead screw and has an internal thread, which connects the sleeve to the lead screw. The sleeve is located on the back side of the friction plate. The cover is engaged with one end of the sleeve, with the internal thread located on the side of the cover away from the friction plate. The surface of the cover away from the friction plate has a first protrusion. The lead screw has a second protrusion and has a first position and a second position relative to the piston. In the first position, the second protrusion and the first protrusion are mutually restrained along the circumferential direction of the lead screw. In the second position, the second protrusion is located on the side of the first protrusion away from the friction plate along the axial direction of the lead screw.

[0015] In the first position, the second protrusion and the first protrusion mutually limit each other along the circumference of the lead screw, making it difficult for the lead screw and piston to rotate relative to each other, thus limiting the piston's stroke. In the second position, along the axial direction of the lead screw, the second protrusion is located on the side of the first protrusion away from the friction plate. That is, the mutual limiting of the first and second protrusions along the circumference of the lead screw can limit the piston's stroke in the direction away from the friction plate, thereby limiting the piston's return stroke. This results in a shorter stroke between the initial position and the braking position, allowing the piston to move quickly from the initial position to the braking position, which is beneficial for a faster braking process. Moreover, the second protrusion is formed on the cover portion, which is more convenient to manufacture than forming the second protrusion on the inner wall of the sleeve portion.

[0016] In some possible implementations of this application, the cover abuts against the friction plate along the axial direction of the lead screw.

[0017] In this way, the cover not only forms the second protrusion to limit the lead screw, but also abuts against the friction plate. It can be understood that the surface area of ​​the cover near the friction plate is larger, so that the cover abuts against the friction plate, resulting in a larger contact area. This allows the force of the piston body to be transmitted to the friction plate more stably, which is beneficial to improving the reliability of braking and reducing the stress concentration of the friction plate.

[0018] In some possible implementations of this application, the lead screw includes a threaded section located on the back side of the friction plate. The threaded section engages with an internal thread. The end face of the threaded section near the friction plate is recessed to form a cavity. A second protrusion is formed on the inner surface of the cavity. In the first position, the first protrusion extends into the cavity along the protruding direction and is mutually restrained by the second protrusion.

[0019] In this way, the end face of the threaded section near the friction plate is concave, forming a cavity. The second protrusion is formed on the inner surface of the cavity, which is flat relative to the end face of the threaded section near the friction plate. The second protrusion travels on this plane. The setting of the second protrusion in this application does not require increasing the axial length of the lead screw, which is beneficial to reducing the axial length of the brake caliper assembly and reducing the space occupied by the brake caliper assembly.

[0020] In some possible implementations of this application, the brake caliper assembly further includes a drive mechanism, a pawl, and a power mechanism. The output shaft of the drive mechanism is arranged side by side with the lead screw along a first direction and is connected for transmission. It is configured to drive the lead screw to rotate relative to the caliper body. A ratchet is coaxially fixed to the output shaft. The pawl is rotatably connected to the caliper body. Along a second direction, the output shaft and the lead screw are located on the same side of the power mechanism. The first direction and the second direction are perpendicular to the axial direction of the lead screw. The power mechanism includes a fixed part and a movable part. The fixed part is fixedly connected to the caliper body and is located on the side of the output shaft near the lead screw. The movable part is slidably connected to the fixed part, and the angle between the relative sliding direction and the first direction is less than 90 degrees. The movable part is connected to the pawl and is configured to drive the pawl to rotate relative to the caliper body, so that the pawl engages with the ratchet groove of the ratchet.

[0021] In this way, the moving part can drive the pawl to rotate relative to the clamp body, so that the pawl engages with the ratchet groove. When the pawl and ratchet groove are engaged, the pawl can restrict the rotation of the ratchet wheel, that is, it can restrict the rotation of the output shaft, and thus restrict the rotation of the lead screw relative to the clamp body. When the friction plate is in contact with the brake disc, the pawl and ratchet groove are engaged, which can achieve the parking function.

[0022] Furthermore, in this application, the angle between the sliding direction of the movable part relative to the fixed part and the first direction is less than 90 degrees, which reduces the length required for the movement of the movable part in the second direction, thus reducing the length of the brake caliper assembly in the second direction. Along the second direction, the output shaft and the lead screw are located on the same side of the power mechanism, and the fixed part of the power mechanism is located on the side of the output shaft closer to the lead screw. Compared to placing the fixed part on the side of the output shaft farther from the lead screw, this application can reduce the total space required for arranging the output shaft, lead screw, and power mechanism in the first direction, thereby reducing the length of the brake caliper assembly in the first direction and reducing the space occupied by the brake caliper assembly.

[0023] In some possible implementations of this application, the middle part of the pawl is rotatably connected to the clamp body, and the movable part is connected to one end of the pawl, configured to drive the pawl to rotate relative to the clamp body, so that the other end of the pawl engages with the ratchet groove.

[0024] In this way, with the power mechanism and ratchet position unchanged, one end of the pawl is rotated and connected to the clamp body, and the moving part is connected to the middle of the pawl, which drives the pawl to rotate relative to the clamp body, so that the other end of the pawl engages with the ratchet groove. In this application, the length of the pawl is smaller, which helps to reduce the space occupied by the pawl. The swing amplitude of the other end of the pawl is also smaller, which facilitates precise control of the swing amplitude of the pawl.

[0025] Secondly, this application provides a vehicle that includes the brake caliper assembly provided in the first aspect of this application.

[0026] The vehicle provided in this application includes the brake caliper assembly provided in the first aspect of this application. The brake caliper assembly provided in the first aspect of this application occupies less space, is easy to arrange on the vehicle, and can reduce the difficulty of the overall vehicle layout design. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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.

[0028] Figure 1 This is one of the structural diagrams of the lead screw and nut assembly in related technologies; Figure 2 This is the second schematic diagram of the screw and nut assembly in related technologies; Figure 3 This is a first-view structural schematic diagram of the brake caliper assembly in some embodiments of this application; Figure 4 This is a cross-sectional schematic diagram of a brake caliper assembly in some embodiments of this application; Figure 5 This is a second-view structural schematic diagram of the brake caliper assembly in some embodiments of this application; Figure 6 This is a schematic diagram of the structure of the limiting protrusion and the limiting cavity cooperating in some embodiments of this application; Figure 7 This is an exploded view from a first perspective of the engagement between the limiting protrusion and the limiting cavity in some embodiments of this application; Figure 8 This is an exploded view from a second perspective of the engagement between the limiting protrusion and the limiting cavity in some embodiments of this application; Figure 9 This is one of the structural schematic diagrams of the screw and piston cooperation in some embodiments of this application; Figure 10 This is the second schematic diagram of the screw and piston assembly in some embodiments of this application; Figure 11 This is a schematic diagram of the lead screw in the first position in some embodiments of this application; Figure 12 This is an exploded view of the brake caliper assembly in some embodiments of this application; Figure 13 This is a schematic diagram of the pawl and ratchet groove fitting together in some embodiments of this application.

[0029] Explanation of reference numerals in the attached figures: 01. Clamp holder; 02. Clamp body; 03. Lead screw; 031. Threaded section; 0311. Cavity; 0312. Second protrusion; 032. Snap ring groove; 04. Friction plate; 041. Limiting cavity; 0411. Opening; 05. Piston; 051. Piston body; 0511. Sleeve; 0512. Cover; 05121. First protrusion; 052. Limiting protrusion; 06. First sealing ring; 07. Dust cover; 08. Bearing housing; 09. First bearing; 10. Force sensor; 11. Brake pad; 12. 13. Second bearing; 14. Snap ring; 15. Copper sleeve; 16. Drive mechanism; 17. Pawl; 18. Power mechanism; 191. Moving part; 192. Fixed part; 193. Ratchet; 10. Gear assembly; 114. First gear; 195. Idler gear; 196. Second gear; 197. Planetary gear train; 20. Upper housing; 21. Lower housing; 22. Second sealing ring; 23. Circuit board; 24. Heat sink; 30. Lead screw; 31. Nut; 311. Slide groove; 312. Sealing part; 33. Seal. Detailed Implementation

[0030] The technical solutions in this application will now be described clearly and in detail with reference to the accompanying drawings.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0035] Electronic brake calipers generally include a drive unit and a lead screw and nut mechanism. The drive unit drives the lead screw 30 to rotate relative to the caliper body around its own axis, causing the nut 31 to translate axially relative to the caliper body. In turn, the nut 31 drives the friction pad to translate relative to the caliper body, causing the friction pad to apply a force to the brake disc.

[0036] However, the inventors of this application have discovered that in related technologies, the length of the brake caliper assembly along the axial direction of the lead screw 30 is too large, resulting in a large space occupation by the brake caliper assembly. The reasons for the large space occupation of the brake caliper assembly in related technologies are analyzed below: Reference Figure 1 and Figure 2 In related technologies, to prevent the nut 31 from rotating synchronously with the lead screw 30 during its rotation relative to the clamp body, a groove 311 is provided on the outer wall of the nut 31. The groove 311 extends axially along the lead screw 30, and a protrusion is provided on the clamp body corresponding to the groove 311. The protrusion slides into the groove 311 along the axial direction of the lead screw 30. In this way, the protrusion and the groove 311 prevent the nut 31 from rotating synchronously with the lead screw 30. The nut 31 is also fitted with a sealing element 33, which is fixedly connected to the clamp body. The sealing element 33 seals the gap between the outer wall of the nut 31 and the clamp body. It can be understood that during the axial translation of the nut 31 relative to the clamp body, if the groove 311 moves to the sealing element 33, the sealing effect of the sealing element 33 is easily affected, and impurities from the external environment can easily enter the brake caliper assembly through the groove 311. Therefore, in related technologies, the slide groove 311 and the nut 31 are arranged axially, and the nut 31 has a longer sealing portion 312 on the side of the slide groove 311 near the seal 33, the length of the sealing portion 312 being greater than or equal to the length of the slide groove 311. Figure 1 and Figure 2In the diagram, the sealing part 312, i.e., the portion of the nut 31 located below the dotted line, ensures that during the translation of the nut 31 relative to the caliper body, the sliding groove 311 cannot easily move to the seal 33, remaining above the seal 33. The seal 33 always engages with the sealing part 312, resulting in a good sealing effect. However, this leads to a longer axial assembly length for the nut 31, at least twice the stroke of the nut 31 relative to the caliper body. Consequently, the caliper assembly becomes excessively long along the axial direction of the lead screw 30, resulting in a larger space requirement for the caliper assembly.

[0037] Therefore, this application provides a vehicle, which can be a sedan, off-road vehicle, or sport utility vehicle (SUV), etc.

[0038] The vehicle includes the brake caliper assembly; please refer to [link / reference]. Figure 3 and Figure 4 The brake caliper assembly includes a caliper holder 01, a caliper body 02, a lead screw 03, a friction pad 04, and a piston 05. The caliper body 02 is mounted on the caliper holder 01. The lead screw 03 is rotatably connected to the caliper body 02 around its own axis. The friction pad 04 is circumferentially connected to the lead screw 03 and mutually positioned with the caliper holder 01. Along the axial direction of the lead screw 03, the friction pad 04 is slidably connected to the caliper holder 01. The piston 05 is helically connected to the lead screw 03, and the piston body 051 abuts against the friction pad 04 axially.

[0039] Please refer to Figures 5 to 8 The friction plate 04 forms a limiting cavity 041. The piston 05 includes a piston body 051 and a limiting protrusion 052 formed on the piston body 051. The piston body 051 is helically connected to the lead screw 03. The limiting protrusion 052 cooperates with the limiting cavity 041. Along the circumference of the lead screw 03, the inner surface of the limiting cavity 041 and the limiting protrusion 052 mutually limit each other.

[0040] Please refer to Figures 8 to 10By limiting the inner surface of the limiting cavity 041 and the limiting protrusion 052 along the circumference of the lead screw 03, the piston 05 and the friction plate 04 are mutually limited along the circumference of the lead screw 03, thereby limiting the piston 05 and the clamp 01 along the circumference. Thus, during the rotation of the lead screw 03 relative to the clamp 02, the piston 05 is less likely to rotate synchronously with the lead screw 03, but instead translates relative to the clamp 01 along the axial direction of the lead screw 03, thereby causing the friction plate 04 to translate relative to the clamp 01. This application limits the synchronous rotation of the piston 05 with the lead screw 03 through the cooperation of the limiting cavity 041 and the limiting protrusion 052, eliminating the need for a groove 311 on the outer surface of the piston 05 to engage with the protrusion of the clamp 02. This ensures that during the translational movement of the piston 05 relative to the clamp 01, the first sealing ring 06 surrounding the piston 05 remains in close contact with the outer surface of the piston 05, avoiding the risk of the groove 311 moving to the first sealing ring 06 and causing a deterioration in sealing performance. Compared to the methods used in related technologies to avoid deterioration of sealing performance, namely, having a longer sealing portion 312 on the side of the nut 311 near the seal 33, with the length of the sealing portion 312 being greater than or equal to the length of the nut 311, and the sealing portion 312 always engaging with the seal 33 during the movement of the nut 31, this application does not require the nut 311. It is sufficient for the piston 05 to have a sealing section that engages with the first sealing ring 06. The length of the piston 05 along the axial direction of the lead screw 03 can be shortened, which in turn shortens the length of the brake caliper assembly along the axial direction of the lead screw 03, thus reducing the space occupied by the brake caliper assembly.

[0041] Please refer to Figure 4 , Figure 7 and Figure 8 Furthermore, in this application, during the axial translational movement of the piston 05 relative to the caliper 01, the friction plate 04 moves together with it. In this way, during the movement of the piston 05, the limiting protrusion 052 and the inner surface of the limiting cavity 041 are less likely to slide relative to each other. Compared with the related technology, which restricts the piston 05 to rotate with the lead screw 03 by sliding cooperation between the protrusion of the caliper body 02 and the slide groove 311, this application can reduce the frictional damage of the piston 05 and is beneficial to improving the reliability and durability of the brake caliper assembly.

[0042] Please refer to Figure 4 , Figure 7 and Figure 8It is understood that in this embodiment, the first sealing ring 06 is fitted onto the piston 05, and the caliper body 02 is fitted onto the first sealing ring 06. The piston 05 extends axially into the caliper body 02 and abuts against the friction plate 04. The first sealing ring 06 is fixedly connected to the caliper body 02 and is radially supported between the outer wall of the piston 05 and the inner wall of the caliper body. The first sealing ring 06 seals the gap between the outer wall of the piston 05 and the caliper body 02. In some embodiments of this application, a dust cover 07 can also be provided between the piston 05 and the caliper body 02. The dust cover 07 is fitted onto the piston 05, and the direction from the piston 05 to the dust cover 07 is the same as the orientation of the friction plate 04. This can further improve the sealing performance of the brake caliper assembly.

[0043] Please refer to Figure 4 , Figure 7 and Figure 8 In this embodiment, the brake caliper assembly can be either a floating or fixed type. Taking a floating caliper assembly as an example, the caliper body 02 and the caliper holder 01 are slidably connected via guide pins, with the relative sliding direction being the same as the axial direction of the lead screw 03. The caliper holder 01 is fixedly connected to the vehicle body, typically to the axle or steering knuckle. During braking, the lead screw 03 rotates relative to the caliper body 02, causing the friction pad 04 to move relative to the caliper holder 01 towards the brake disc. When the friction pad 04 is in contact with the brake disc, both the piston 05 and the friction pad 04 remain stationary relative to the caliper holder 01. The relative rotation between the piston 05 and the lead screw 03 causes the lead screw 03 to drive the caliper body 02 to translate relative to the caliper holder 01 along the axial direction of the lead screw 03. This causes the caliper body 02 to drive the brake pad 11 towards the brake disc, bringing the brake pad 11 into contact with the brake disc. Thus, the friction pad 04 and the brake pad 11 clamp the brake disc along its thickness direction, achieving deceleration and stopping.

[0044] Please refer to Figure 4 , Figure 7 and Figure 8 In some embodiments of this application, the friction plate 04 and the brake plate 11 are slidably connected to the clamp 01 via a yoke spring. In some embodiments of this application, the reset of the friction plate 04 and the brake plate 11 can be achieved via a V-spring.

[0045] Please refer to Figure 4 , Figure 7 and Figure 8In some embodiments of this application, the lead screw 03 is constructed as a stepped shaft, which includes a first diameter segment and a second diameter segment. The diameter of the first diameter segment is larger than that of the second diameter segment. The first diameter segment is constructed as a threaded segment 031, which engages with the internal thread of the piston 05. The direction from the first diameter segment to the second diameter segment is opposite to the orientation of the friction plate 04. Along the direction from the first diameter segment to the second diameter segment, the second diameter segment is sequentially fitted with a bearing seat 08, a first bearing 09, and a force sensor 10. The first bearing 09 can be a needle roller bearing. Along the axial direction of the lead screw 03, the bearing seat 08, the first bearing 09, and the force sensor 10 are all located between the end face of the first diameter segment near the second diameter segment and the clamp body 02. In this way, when the friction pad 04 is in contact with the brake disc, the lead screw 03 drives the caliper body 02 to translate relative to the caliper frame 01 along the axial direction of the lead screw 03. The translation direction is from the first diameter segment to the second diameter segment. The first diameter segment can apply a force to the caliper body 02 in sequence through the bearing seat 08, the first bearing 09 and the force sensor 10. The force is along the axial direction of the lead screw 03, from the first diameter segment to the second diameter segment, so that the force applied by the lead screw 03 to the caliper body 02 is relatively stable. Moreover, the force sensor 10 can also measure the magnitude of the force, which is the same as the magnitude of the braking force, which facilitates precise control of the braking force.

[0046] Please refer to Figure 4 , Figure 7 and Figure 8 In some embodiments of this application, the clamp body 02 forms a receiving cavity and a through hole, which connects the inside and outside of the receiving cavity. The depth direction of the through hole is the same as the axial direction of the lead screw 03. The bearing seat 08, the first bearing 09, and the force sensor 10 are all located inside the receiving cavity. The force sensor 10 is used to abut against the surface of the receiving cavity with the through hole to measure the braking force. The second diameter segment mates with the through hole. This helps to improve the stability of the lead screw 03 installation. In some embodiments of this application, a copper sleeve 14 can be provided inside the through hole. The second diameter segment can mate with the through hole through the copper sleeve 14. The copper sleeve 14 can be interference-fitted with the through hole. The copper sleeve 14 has a lubricating effect, which can reduce the wear of the lead screw 03. In some embodiments of this application, the outer wall of the second diameter segment is radially recessed to form a snap ring groove 032. The snap ring groove 032 clamps a snap ring 13. Along the direction from the second diameter segment to the first diameter segment, the snap ring 13 and the outer surface of the clamp body 02 mutually limit each other. In this way, the lead screw 03 is mutually restrained by the retaining ring 13 and the clamp body 02, reducing the risk of the lead screw 03 moving relative to the clamp body 02 from the second diameter segment to the first diameter segment. In some embodiments of this application, the second diameter segment is also fitted with a second bearing 12, which can be a thrust ball bearing, and the second bearing 12 is located on the outer surface of the retaining ring 13 and the clamp body 02. This helps to reduce wear between the retaining ring 13 and the clamp body 02.

[0047] Please refer to Figure 4 , Figure 7 and Figure 8 In some embodiments of this application, the piston body 051 is located on the back side of the friction plate 04. The limiting cavity 041 has an opening 0411, which is formed on the back side of the friction plate 04. The limiting protrusion 052 protrudes in a direction opposite to the orientation of the opening 0411, and the limiting protrusion 052 extends into the limiting cavity 041 through the opening 0411 and engages with the limiting cavity 041.

[0048] By forming the opening 0411 on the back side of the friction plate 04, the distance between the opening 0411 and the piston body 051 is relatively small. This allows the limiting protrusion 052 formed on the piston body 051 to reach the opening 0411 with a relatively small protrusion length and extend into the limiting cavity 041 through the opening 0411. By making the direction of the limiting protrusion 052 opposite to the orientation of the opening 0411, the limiting protrusion 052 does not need to have a large bend to extend into the limiting cavity 041 through the opening 0411. This helps to improve the rigidity of the limiting protrusion 052, improve the ease of manufacturing the limiting protrusion 052, and reduce the material waste of the limiting protrusion 052.

[0049] Please refer to Figure 4 , Figure 7 and Figure 8 In some embodiments of this application, the outer wall of the friction plate 04 is recessed to form a limiting groove, and the limiting cavity 041 is the inner cavity of the limiting groove. Along a direction opposite to the orientation of the friction plate 04, the limiting groove penetrates the friction plate 04 to form an opening 0411.

[0050] Thus, the limiting cavity 041 is located at the outer edge of the friction plate 04. It is understood that during braking, the middle of the friction plate 04 bears greater force than its outer edge. This application positions the limiting cavity 041 at the outer edge of the friction plate 04, avoiding the middle of the friction plate 04. This helps to ensure higher strength and rigidity in the middle of the friction plate 04, making it less prone to damage even under greater force. By extending the limiting groove through the friction plate 04 in a direction opposite to its orientation, forming an opening 0411, with the opening 0411 facing the side of the friction plate 04 closer to the piston body 051, the limiting protrusion 052 does not need to have a large bend or protrude an excessive distance to extend into the limiting cavity 041 through the opening 0411. This improves the rigidity of the limiting protrusion 052, enhances the ease of manufacturing the limiting protrusion 052, and reduces material waste.

[0051] Please refer to Figure 4 , Figure 7 and Figure 8In some embodiments of this application, the orientation of the opening 0411 is opposite to the orientation of the friction plate 04. Along the axial direction of the lead screw 03, a limiting protrusion 052 is formed on the end face of the piston body 051 near the friction plate 04.

[0052] By forming a limiting protrusion 052 along the axial direction of the lead screw 03 on the end face of the piston body 051 near the friction plate 04, the distance between the opening 0411 and the bottom of the limiting protrusion 052 is relatively small. This allows the limiting protrusion 052 to reach the opening 0411 with a smaller protrusion length, which helps improve the rigidity of the limiting protrusion 052, improves the ease of manufacturing the limiting protrusion 052, and reduces material loss of the limiting protrusion 052. By making the orientation of the opening 0411 opposite to the orientation of the friction plate 04, the limiting protrusion 052 does not need to have a large bend to extend into the limiting cavity 041 through the opening 0411. This further helps to improve the rigidity of the limiting protrusion 052, improve the ease of manufacturing the limiting protrusion 052, and reduce material loss of the limiting protrusion 052.

[0053] Please refer to Figure 4 and Figure 11 In some embodiments of this application, the piston body 051 includes a sleeve 0511 and a cover 0512. The sleeve 0511 is sleeved on the lead screw 03, and the sleeve 0511 has an internal thread. The sleeve 0511 is helically connected to the lead screw 03 through the internal thread, and the sleeve 0511 is located on the back side of the friction plate 04. The cover 0512 is engaged with one end of the sleeve 0511, and the internal thread is located on the side of the cover 0512 away from the friction plate 04. The surface of the cover 0512 on the side away from the friction plate 04 has a first protrusion 05121. The lead screw 03 has a second protrusion 0312. The lead screw 03 has a first position and a second position relative to the piston 05. In the first position, along the circumferential direction of the lead screw 03, the second protrusion 0312 and the first protrusion 05121 are mutually limited. In the second position, along the axial direction of the lead screw 03, the second protrusion 0312 is located on the side of the first protrusion 05121 away from the friction plate 04.

[0054] In the first position, along the circumference of the lead screw 03, the second protrusion 0312 and the first protrusion 05121 mutually limit each other, making it difficult for the lead screw 03 and the piston 05 to rotate relative to each other, thus limiting the stroke of the piston 05. In the second position, along the axial direction of the lead screw 03, the second protrusion 0312 is located on the side of the first protrusion 05121 away from the friction plate 04. That is, the mutual limiting of the first protrusion 05121 and the second protrusion 0312 along the circumference of the lead screw 03 can limit the stroke of the piston 05 in the direction away from the friction plate 04, thus limiting the return stroke of the piston 05. This makes the stroke of the piston 05 between the initial position and the braking position shorter, allowing the piston 05 to move quickly from the initial position to the braking position, which is beneficial for a faster braking process. Moreover, the second protrusion 0312 is formed on the cover portion 0512, which is more convenient to manufacture than forming the second protrusion 0312 on the inner sidewall of the sleeve portion 0511.

[0055] Please refer to Figure 4 and Figure 11 In some embodiments of this application, the cover portion 0512 may be press-fitted or integrally formed with the sleeve portion 0511 to achieve a fixed connection between the cover portion 0512 and the sleeve portion 0511.

[0056] Please refer to Figure 4 and Figure 11 In some embodiments of this application, in the second position and the first position, at least a portion of the force sensor 10 is located within the space enclosed by the internal thread of the piston 05. Thus, along the axial direction of the lead screw 03, the piston 05 and the force sensor 10 are arranged more compactly, which helps to reduce the space occupied by the brake caliper assembly.

[0057] Please refer to Figure 4 and Figure 11 In some embodiments of this application, the cover portion 0512 abuts against the friction plate 04 along the axial direction of the lead screw 03. Thus, the cover portion 0512 serves not only to form the second protrusion 0312 to limit the lead screw 03, but also to abut against the friction plate 04. It is understood that the surface area of ​​the cover portion 0512 near the friction plate 04 is larger, resulting in a larger contact area between the cover portion 0512 and the friction plate 04. This allows the force of the piston body 051 to be transmitted more stably to the friction plate 04, which is beneficial for improving braking reliability and reducing stress concentration on the friction plate 04.

[0058] Please refer to Figure 4 and Figure 11In some embodiments of this application, the lead screw 03 includes a threaded section 031, which is located on the back side of the friction plate 04. The threaded section 031 is engaged with an internal thread. The end face of the threaded section 031 near the friction plate 04 is recessed to form a cavity 0311. A second protrusion 0312 is formed on the inner surface of the cavity 0311. In the first position, the first protrusion 05121 extends into the cavity 0311 in the protruding direction and is mutually limited with the second protrusion 0312.

[0059] In this way, the end face of the threaded section 031 near the friction plate 04 is recessed to form a cavity 0311. The second protrusion 0312 is formed on the inner surface of the cavity 0311. The end face of the threaded section 031 near the friction plate 04 is flat. The second protrusion 0312 travels on this plane. The setting of the second protrusion 0312 in this application does not require increasing the axial length of the lead screw 03, which is beneficial to reducing the axial length of the brake caliper assembly in the lead screw 03 and reducing the space occupied by the brake caliper assembly.

[0060] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the brake caliper assembly further includes a drive mechanism 15, a pawl 16, and a power mechanism 17. The drive mechanism 15 can be an electric motor. The output shaft of the drive mechanism 15 and the lead screw 03 are arranged side by side along a first direction and are connected in a transmission connection. The drive mechanism 15 is configured to drive the lead screw 03 to rotate relative to the caliper body 02. A ratchet 18 is coaxially fixed to the output shaft. The pawl 16 is rotatably connected to the caliper body 02. Along a second direction, the output shaft and the lead screw 03 are located on the same side of the power mechanism 17. The two directions are perpendicular to the axis of the lead screw 03. The power mechanism 17 includes a fixed part 172 and a movable part 171. The fixed part 172 is fixedly connected to the clamp body 02. The fixed part 172 is located on the side of the output shaft close to the lead screw 03. The movable part 171 is slidably connected to the fixed part 172, and the angle between the relative sliding direction and the first direction is less than 90 degrees. The movable part 171 is connected to the pawl 16 and is configured to drive the pawl 16 to rotate relative to the clamp body 02, so that the pawl 16 engages with the ratchet groove of the ratchet wheel 18.

[0061] In this way, the movable part 171 can drive the pawl 16 to rotate relative to the clamp body 02, so that the pawl 16 engages with the ratchet groove. When the pawl 16 is engaged with the ratchet groove, it can restrict the rotation of the ratchet 18, that is, it can restrict the rotation of the output shaft, and thus restrict the rotation of the lead screw 03 relative to the clamp body 02. When the friction plate 04 is in contact with the brake disc, the engagement of the pawl 16 with the ratchet groove can achieve the parking function.

[0062] Furthermore, in this application, the angle between the sliding direction of the movable part 171 relative to the fixed part 172 and the first direction is less than 90 degrees, which makes the length required for the movement of the movable part 171 in the second direction smaller, thus reducing the length of the brake caliper assembly in the second direction. Along the second direction, the output shaft and the lead screw 03 are located on the same side of the power mechanism 17, and the fixed part 172 of the power mechanism 17 is provided on the side of the output shaft close to the lead screw 03. Compared with providing the fixed part 172 on the side of the output shaft away from the lead screw 03, this application can reduce the total space required for arranging the output shaft, lead screw 03, and power mechanism 17 in the first direction, thereby reducing the length of the brake caliper assembly in the first direction and reducing the space occupied by the brake caliper assembly.

[0063] Please refer to Figure 4 , Figure 12 and Figure 13 In this embodiment, the power mechanism 17 can be implemented in various ways, such as a hydraulic cylinder, an electric cylinder, or an electromagnetic actuator.

[0064] Please refer to Figure 4 , Figure 12 and Figure 13 It is understood that, in the embodiments of this application, the axis of rotation of the pawl 16 relative to the clamp body 02 is parallel to the axis of the lead screw 03. In some embodiments of this application, along the second direction, the pawl 16 and the power mechanism 17 can be located on the same side of the output shaft. In this way, the length of the pawl 16 can be set to be smaller, which is beneficial to reducing the space occupied by the pawl 16.

[0065] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the pawl 16 has a slotted hole with the depth direction of the slotted hole being the same as the axial direction of the lead screw 03. The movable part 171 has a protrusion that slides in conjunction with the slotted hole. Thus, as the movable part 171 slides relative to the fixed part 172, the protrusion can slide along the slotted hole to drive the pawl 16 to rotate relative to the clamp body 02, thereby realizing the engagement and disengagement of the pawl 16 and the ratchet groove.

[0066] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the middle part of the pawl 16 is rotatably connected to the clamp body 02, and the movable part 171 is connected to one end of the pawl 16, configured to drive the pawl 16 to rotate relative to the clamp body 02, so that the other end of the pawl 16 is engaged with the ratchet groove.

[0067] Thus, with the positions of the power mechanism 17 and the ratchet 18 remaining unchanged, relative to the rotational connection of one end of the pawl 16 to the clamp body 02, the movable part 171 is connected to the middle of the pawl 16, causing the pawl 16 to rotate relative to the clamp body 02, so that the other end of the pawl 16 engages with the ratchet groove. In this application, the length of the pawl 16 is smaller, which is beneficial to reduce the space occupied by the pawl 16. In this application, the swing amplitude of the other end of the pawl 16 is also smaller, which facilitates precise control of the swing amplitude of the pawl 16.

[0068] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the brake caliper assembly further includes a gear assembly 19, which includes a first gear 191 and a second gear 193. The first gear 191 is coaxially fixed to the output shaft, and the second gear 193 is coaxially arranged and driven by the lead screw 03. The diameter of the second gear 193 is larger than that of the first gear 191, and the first gear 191 and the second gear 193 are driven by each other. This achieves the effect of deceleration and torque increase. The coaxial arrangement of the second gear 193 and the lead screw 03 can be either coaxially fixed or connected through a planetary gear train 194. For example, the second gear 193 can be coaxially fixed to the sun gear of the planetary gear train 194, and the second gear 193 is rotatably connected to the caliper body 02. The lead screw 03 is coaxially fixed to the planet carrier of the planetary gear train 194, and the ring gear of the planetary gear train 194 can be fixedly connected to the caliper body 02. In some embodiments of this application, the gear assembly 19 may also include an idler gear 192, through which the first gear 191 and the second gear 193 can be driven by the idler gear 192.

[0069] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the gear assembly 19 may be arranged side by side with the power mechanism 17 along the second direction. In this way, the gear assembly 19 and the power mechanism 17 are arranged more compactly, which helps to reduce the space occupied.

[0070] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the second gear 193 is connected to one end of the second diameter segment extending out of the caliper body 02 through a through hole. The brake caliper assembly may also include an upper housing 20 and a lower housing 21, both of which are fixedly connected to the caliper body 02. The upper housing 20 and the lower housing 21 are axially aligned along the lead screw 03, forming a mounting cavity together, in which the gear assembly 19 can be disposed. Thus, the upper housing 20 and the lower housing 21 can jointly protect the gear assembly 19. In some embodiments of this application, the gear assembly 19 may be connected to the lower housing 21.

[0071] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, the pawl 16 and the power mechanism 17 may also be disposed within the mounting cavity. In some embodiments of this application, the pawl 16 and the power mechanism 17 may be connected to the lower housing 21.

[0072] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, along the axial direction of the lead screw 03, the lower housing 21 is located on the side of the upper housing 20 close to the clamp body 02. A second sealing ring 22 can be provided between the lower housing 21 and the clamp body 02. The second sealing ring 22 surrounds the second bearing 12 and seals the gap between the lower housing 21 and the clamp body 02.

[0073] Please refer to Figure 4 , Figure 12 and Figure 13 In some embodiments of this application, a circuit board 23 and a heat sink 24 may also be disposed within the mounting cavity, with the heat sink 24 thermally connected to the circuit board 23. In this way, the mounting cavity can protect the circuit board 23 and the heat sink 24, and the mounting cavity is fully utilized.

[0074] Please refer to Figure 4 , Figure 12 and Figure 13 Generally, the orientation of the motor's output shaft is opposite to the orientation of the friction plate 04. In some embodiments of this application, the motor can be fixedly connected to the lower housing 21. In this way, the lower housing 21 is fully utilized, which helps to improve the compactness of the structure.

[0075] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A brake caliper assembly characterized by, include: Pliers (01); The clamp body (02) is disposed on the clamp frame (01); The lead screw (03) is rotatably connected to the clamp body (02) around its own axis; The friction plate (04) is positioned relative to the clamp (01) along the circumferential direction of the lead screw (03). Along the axial direction of the lead screw (03), the friction plate (04) is slidably connected to the clamp (01), and the friction plate (04) forms a limiting cavity (041). The piston (05) includes a piston body (051) and a limiting protrusion (052) formed on the piston body (051). The piston body (051) is helically connected to the lead screw (03). The piston body (051) abuts against the friction plate (04) along the axial direction. The limiting protrusion (052) cooperates with the limiting cavity (041). Along the circumference of the lead screw (03), the inner surface of the limiting cavity (041) and the limiting protrusion (052) mutually limit each other.

2. The brake caliper assembly of claim 1, wherein, The limiting cavity (041) has an opening (0411), which is formed on the back side of the friction plate (04); The piston body (051) is located on the back side of the friction plate (04). The direction of the protrusion of the limiting protrusion (052) is opposite to the orientation of the opening (0411). The limiting protrusion (052) extends into the limiting cavity (041) through the opening (0411) and cooperates with the limiting cavity (041).

3. The brake caliper assembly of claim 2, wherein, The outer wall of the friction plate (04) is recessed to form a limiting groove, and the limiting cavity (041) is the inner cavity of the limiting groove; The limiting groove penetrates the friction plate (04) in a direction opposite to the orientation of the friction plate (04) to form the opening (0411).

4. The brake caliper assembly of claim 2, wherein, The orientation of the opening (0411) is opposite to the orientation of the friction plate (04); Along the axial direction of the lead screw (03), the limiting protrusion (052) is formed on the end face of the piston body (051) near the friction plate (04).

5. The brake caliper assembly of claim 1, wherein, The piston body (051) includes: A sleeve (0511) is sleeved on the lead screw (03). The sleeve (0511) has an internal thread. The sleeve (0511) is helically connected to the lead screw (03) through the internal thread. The sleeve (0511) is located on the back side of the friction plate (04). The cover (0512) is engaged with one end of the sleeve (0511), the internal thread is located on the side of the cover (0512) away from the friction plate (04), and the surface of the cover (0512) away from the friction plate (04) has a first protrusion (05121). The lead screw (03) has a second protrusion (0312). The lead screw (03) has a first position and a second position relative to the piston (05). In the first position, along the circumference of the lead screw (03), the second protrusion (0312) and the first protrusion (05121) are mutually limited. In the second position, along the axial direction of the lead screw (03), the second protrusion (0312) is located on the side of the first protrusion (05121) away from the friction plate (04).

6. The brake caliper assembly of claim 5, wherein, Along the axial direction of the lead screw (03), the cover (0512) abuts against the friction plate (04).

7. The brake caliper assembly of claim 5, wherein, The lead screw (03) includes a threaded section (031), which is located on the back side of the friction plate (04) and engages with the internal thread. The end face of the threaded section (031) near the friction plate (04) is recessed to form a cavity (0311), and the second protrusion (0312) is formed on the inner surface of the cavity (0311). In the first position, the first protrusion (05121) extends into the cavity (0311) in the protruding direction and is mutually limited with the second protrusion (0312).

8. The brake caliper assembly of any one of claims 1 to 7, wherein, It also includes a drive mechanism (15), a pawl (16), and a power mechanism (17). The output shaft of the drive mechanism (15) is arranged side by side with the lead screw (03) along a first direction and is connected for transmission. It is configured to drive the lead screw (03) to rotate relative to the clamp body (02). A ratchet (18) is coaxially fixed to the output shaft. The pawl (16) is rotatably connected to the clamp body (02). Along a second direction, the output shaft and the lead screw (03) are located on the same side of the power mechanism (17). The first direction and the second direction are perpendicular to the axial direction of the lead screw (03). The structure (17) includes a fixed part (172) and a movable part (171). The fixed part (172) is fixedly connected to the clamp body (02). The fixed part (172) is located on the side of the output shaft near the lead screw (03). The movable part (171) is slidably connected to the fixed part (172), and the angle between the relative sliding direction and the first direction is less than 90 degrees. The movable part (171) is connected to the pawl (16) and is configured to drive the pawl (16) to rotate relative to the clamp body (02), so that the pawl (16) engages with the ratchet groove of the ratchet wheel (18).

9. The brake caliper assembly of claim 8, wherein, The middle part of the pawl (16) is rotatably connected to the clamp body (02), and the movable part (171) is connected to one end of the pawl (16), configured to drive the pawl (16) to rotate relative to the clamp body (02), so that the other end of the pawl (16) is engaged with the ratchet groove.

10. A vehicle characterized by comprising: The brake caliper assembly includes any one of claims 1 to 9.

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