Brake and vehicle

Abstract

The brake comprises a caliper body, a first bearing, a ball screw, a force sensor and a second bearing, the caliper body is provided with a containing cavity and a through hole communicated with the containing cavity and the external space, and an annular protrusion surrounding the through hole is arranged on the inner wall of the containing cavity in a protruding mode; the first bearing is connected into the annular protrusion in a sleeved mode. The ball screw comprises a screw body and a limiting protrusion connected to the screw body in a sleeved mode, the screw body is connected into the first bearing in a sleeved mode and penetrates through the through hole, and the limiting protrusion is located in the containing cavity. The force sensor is sleeved outside the annular bulge; and the second bearing is sleeved outside the screw rod main body and is clamped between the limiting bulge and the force sensor. The brake is provided with the annular protrusion so that the force sensor can directly surround the peripheral side of the first bearing, the force sensor and the first bearing do not need to be arranged in the axial direction, and therefore the axial length of the brake is shortened, and occupied space is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle brakes, and in particular relates to a brake and a vehicle. Background Art

[0002] Currently, brake-by-wire systems are the trend in automotive braking systems. From the earliest electronic parking systems (EPBs), to electronic boosters (iboosters) that replace vacuum boosters, and finally to integrated brake control systems (oneboxes), all have reached mass production and are relatively mature technologies. However, pure electromechanical brakes (EMBs) for disc brakes in China are still in the research and development stage. Compared to current brake-by-wire systems, these brakes offer advantages such as faster response, simpler structure, and easier maintenance. As vehicles move toward electrification and intelligentization, electromechanical brakes are becoming a trend in braking systems due to their easier integration with electric control systems.

[0003] Existing brake force control primarily relies on a controller that uses sensors monitoring the motor's rotor position and operating current, combined with software algorithms, to determine piston thrust. However, this method generally lacks high accuracy. To improve the accuracy of piston thrust, existing brakes use force sensors to capture this force. However, the inclusion of force sensors increases the axial length of the electromechanical brake, hindering its placement within the vehicle. Utility Model Content

[0004] The purpose of the utility model is to provide a brake and a vehicle, aiming to solve the technical problem that the current brake uses a force sensor which increases the axial length.

[0005] The present invention is implemented as follows: in a first aspect, a brake is provided, comprising:

[0006] The pliers body has a receiving cavity and a through hole connecting the receiving cavity with the external space, and the inner wall of the receiving cavity is provided with an annular protrusion surrounding the through hole;

[0007] A first bearing is sleeved in the annular protrusion;

[0008] A ball screw, comprising a screw body and a limiting protrusion sleeved on the screw body, wherein the screw body is sleeved in the first bearing and passes through the through hole, and the limiting protrusion is located in the accommodating cavity;

[0009] A force sensor is sleeved on the outside of the annular protrusion;

[0010] The second bearing is sleeved on the outside of the screw rod body and clamped between the limiting protrusion and the force sensor.

[0011] In some embodiments of the first aspect, a limiting groove is provided on the force sensor, a limiting hole connecting the accommodating cavity and the external space is opened on the caliper body, and the brake also includes a limiting pin, which is passed through the limiting hole and inserted into the limiting groove.

[0012] In some embodiments of the first aspect, a step structure is formed on the wall of the limiting hole, and the step structure has a table surface perpendicular to the axis of the limiting hole. The limiting pin includes a limiting rod and a limiting cap connected to the end of the limiting rod, the limiting cap abuts against the table surface of the step structure, and the limiting rod is inserted into the limiting groove.

[0013] In some embodiments of the first aspect, the accommodating cavity has a first cavity wall and a second cavity wall arranged in an annular manner on the first cavity wall, the through hole passes through the first cavity wall, a first positioning structure is provided on the first cavity wall, a second positioning structure is provided on the force sensor, and the first positioning structure is plugged into the second positioning structure.

[0014] In some embodiments of the first aspect, the first positioning structure includes a positioning groove formed on the caliper body, and the second positioning structure includes a positioning column protruding from the actuator housing, wherein the positioning column is inserted into the positioning groove.

[0015] In some embodiments of the first aspect, a connecting hole connecting the accommodating cavity and the external space is provided on the caliper body, a conductive protrusion is provided on the force sensor, and the conductive protrusion is passed through the connecting hole. The brake also includes an actuator housing docked with the caliper body, and the actuator housing is electrically connected to the conductive protrusion.

[0016] In some embodiments of the first aspect, the brake further includes a shaft retaining ring connected to the screw body and protruding from one end of the through hole, wherein the shaft retaining ring is used to limit the screw body from escaping from the through hole toward the accommodating cavity.

[0017] In some embodiments of the first aspect, the caliper body has a mounting surface, the through hole extends through the mounting surface, and the brake further includes an elastic member clamped between the shaft retaining ring and the mounting surface.

[0018] In some embodiments of the first aspect, a third bearing is provided between the elastic member and the mounting surface.

[0019] In a second aspect, a vehicle is provided, comprising a vehicle body and the brake as described in the above embodiments, wherein the brake is arranged on the vehicle body.

[0020] The technical effect of the present invention compared to the prior art is as follows: when the brake is braking, the ball screw drives the piston to move toward the braking position, and the piston applies a reverse thrust to the ball screw in the direction of the motor. The reverse thrust is transmitted to the force sensor through the limiting protrusion and the second bearing. The reverse thrust collected by the force sensor is the thrust of the piston. In this way, the brake can directly collect the piston thrust through the force sensor, and then accurately control the magnitude of each braking force to ensure the reliability of braking. In particular, when the vehicle is traveling on a low-adhesion road, the control of the braking force is particularly important. Appropriate braking force is an important guarantee for the vehicle to reduce the braking distance, which can make the vehicle travel safer. In addition, by providing an annular protrusion, the force sensor can be directly surrounded by the circumference of the first bearing, without the need to be arranged axially with the first bearing, thereby shortening the axial length of the brake and saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a front view of the brake provided by an embodiment of the utility model;

[0023] Figure 2 1 is a front view of a brake force sensor provided by an embodiment of the present utility model;

[0024] Figure 3 is an exploded view of a brake provided by an embodiment of the present utility model, wherein the caliper body has a cross section;

[0025] Figure 4 yes Figure 1 A cross-sectional view of the brake at AA;

[0026] Figure 5 yes Figure 1 A cross-sectional view of the brake at the BB;

[0027] Figure 6 It is a three-dimensional structural diagram of the actuator housing of the brake provided by an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 10. Clamp body; 101. Accommodating cavity; 102. Through hole; 103. Limiting hole; 104. Positioning groove; 105. Connecting hole; 1031. Table; 11. Annular protrusion; 1011. First cavity wall; 1012. Second cavity wall; 1013. Mounting surface; 20. Actuator housing; 21. Metal sheet; 22. Electrical connection protrusion; 23. Positioning column; 30. First bearing; 40. Ball screw; 41. Screw body; 411. Screw Part; 412, rotating part; 42, limiting protrusion; 421, first protrusion; 422, second protrusion; 401, connecting groove; 50, force sensor; 501, first surface; 502, second surface; 51, limiting groove; 52, conductive protrusion; 521, protrusion; 522, probe; 60, second bearing; 70, limiting pin; 71, limiting rod; 72, limiting cap; 81, shaft retaining ring; 82, elastic member; 83, third bearing. DETAILED DESCRIPTION

[0030] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first," "second," or "third" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0033] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0035] An embodiment of the present invention provides a brake and a vehicle. The vehicle comprises a vehicle body and the brake. The brake is installed at the wheels of the vehicle body and is used to brake the wheels.

[0036] The brake includes a motor, an actuator housing, a main body, a piston and a caliper. The actuator housing 20 is connected to the main body, the motor is installed in the actuator housing, the piston is installed in the main body, and the caliper is connected to the piston. The motor drives the piston to move through the main body. The movement of the piston can drive the caliper to apply braking force to the wheel, thereby braking the wheel.

[0037] See also Figure 1 and Figure 2 The main body of the brake includes a caliper body 10, a first bearing 30, a ball screw 40, a force sensor 50 and a second bearing 60.

[0038] The caliper body 10 has a receiving cavity 101 and a through hole 102 communicating the receiving cavity 101 with the external space. An annular protrusion 11 surrounding the through hole 102 is protruded from the wall surface of the receiving cavity 101 .

[0039] The first bearing 30 is sleeved in the annular protrusion 11 , which can limit radial movement of the first bearing 30 .

[0040] The ball screw 40 includes a screw body 41 and a stopper protrusion 42 that is sleeved on the screw body 41. The screw body 41 is sleeved in the first bearing 30 and passes through the through hole 102. The stopper protrusion 42 is located in the accommodating cavity 101. The screw body 41 includes a connected screw portion and a rotating portion 412. The screw portion is located in the accommodating cavity 101. The rotating portion 412 is sleeved in the first bearing 30. The end of the rotating portion 412, away from the screw portion, passes through the through hole 102 and extends outside the accommodating cavity 101. The diameter of the screw portion is greater than the diameter of the rotating portion 412. The stopper protrusion 42 is sleeved on the outside of the rotating portion 412.

[0041] The force sensor 50 is sleeved onto the annular protrusion 11, and the second bearing 60 is sleeved onto the outside of the screw body 41, specifically onto the rotating portion 412. The second bearing 60 is clamped between the limiting protrusion 42 and the force sensor 50. The second bearing 60 is a plane bearing that is used to bear axial loads and reduce friction between the limiting protrusion 42 and the force sensor 50.

[0042] The motor is connected to the rotating portion 412 and can input torque to the ball screw 40 through the rotating portion 412, thereby driving the ball screw 40 to rotate. The screw portion is provided with an external thread, and the ball screw 40 is connected to the piston through this external thread. The caliper body 10 can limit the rotation of the piston about the axis of the ball screw 40. When the motor drives the ball screw 40 to rotate, the piston can move along the axial direction of the ball screw 40 to drive the caliper to brake or release the wheel. The piston has a starting position near the limiting protrusion 42 and a braking position away from the limiting protrusion 42. When the ball screw 40 rotates, the piston can move between the starting position and the braking position. When the piston is in the braking position, it can drive the caliper to brake, and when the piston leaves the braking position, the brake can be released.

[0043] When the brake is in operation, the ball screw 40 drives the piston toward the braking position. The piston applies a reverse thrust to the ball screw 40 in the direction of the motor. This reverse thrust is transmitted to the force sensor 50 via the limiting protrusion 42 and the second bearing 60. The reverse thrust detected by the force sensor 50 is the piston thrust. In this way, the brake can directly detect the piston thrust through the force sensor 50, thereby accurately controlling the magnitude of each braking force and ensuring braking reliability. Braking force control is particularly important when the vehicle is traveling on low-adhesion roads. Appropriate braking force is crucial for reducing the vehicle's braking distance, making driving safer. Furthermore, by providing the annular protrusion 11, the force sensor 50 can be directly positioned around the circumference of the first bearing 30, eliminating the need for axial alignment with the first bearing 30. This shortens the axial length of the brake and saves space.

[0044] See also Figure 2 and Figure 3 Specifically, the accommodating cavity 101 has a first cavity wall surface 1011 and a second cavity wall surface 1012 surrounding the first cavity wall surface 1011. The caliper body 10 has a mounting surface 1013, which faces away from the first cavity wall surface 1011. The through hole 102 passes through the mounting surface 1013 and the first cavity wall surface 1011. An annular protrusion 11 is provided on the first cavity wall surface 1011, extending along the edge of the through hole 102 and surrounding the through hole 102. The annular protrusion 11 can be a circumferentially closed ring, or can be provided with multiple notches on the circumference to form one or more arc segments, which is not limited here.

[0045] Optionally, the cross-sections of the annular protrusion 11 and the through hole 102 are both circular to match the ball screw 40. Of course, in other embodiments, the cross-sections of the annular protrusion 11 and the through hole 102 can also be other shapes, as long as they can achieve the limitation of the first bearing 30 and the insertion of the ball screw 40.

[0046] Optionally, the limiting protrusion 42 includes a first protrusion portion 421 and a second protrusion portion 422 connected in sequence along the axial direction. The first protrusion portion 421 and the second protrusion portion 422 are both annular and are both sleeved on the outside of the rotating portion 412. The second protrusion portion 422 is located on the side of the first protrusion portion 421 that is away from the screw rod portion. The outer diameter of the first protrusion portion 421 is greater than the outer diameter of the second protrusion portion 422, and the second bearing 60 is sleeved on the outside of the second protrusion portion 422.

[0047] Optionally, the first bearing 30 may form an interference fit with the annular protrusion 11 to limit its axial movement through friction. The inner diameter of the annular protrusion 11 may be larger than the inner diameter of the through hole 102, that is, the edge of the through hole 102 protrudes from the inner surface of the annular protrusion 11. The first bearing 30 abuts against the first cavity wall 1011 located within the annular protrusion 11, thereby limiting the first bearing 30 from axially leaking out of the accommodating cavity 101 from the through hole 102.

[0048] Optionally, the force sensor 50 is annular and has a clearance fit with the annular protrusion 11, which can limit the radial movement of the force sensor 50. The force sensor 50 can abut against the first cavity wall 1011, so that the force sensor 50 can be clamped between the second bearing 60 and the first cavity wall 1011 to limit the axial movement of the force sensor 50.

[0049] Specifically, please combine Figure 4 The force sensor 50 has a first surface 501 and a second surface 502 facing each other along the axial direction. The first surface 501 abuts against the first cavity wall 1011 , and the second surface 502 abuts against the second bearing 60 .

[0050] In other embodiments, the first bearing 30 may also have a clearance fit with the annular protrusion 11, with the first bearing 30 clamped between the first cavity wall 1011 and the second bearing 60, without limitation. The force sensor 50 may also be arc-shaped, or multiple force sensors 50 may be provided, with the multiple force sensors 50 arranged circumferentially along the annular protrusion 11, as long as they can detect the reverse thrust applied to the ball screw 40. The force sensor 50 may also have an interference fit with the annular protrusion 11, and achieve axial position limitation through friction between the annular protrusion 11, without limitation.

[0051] See also Figure 2 and Figure 5In some embodiments, a limit slot 51 is provided on the force sensor 50, and a limit hole 103 is provided on the caliper body 10, connecting the accommodating cavity 101 and the external space. The brake further includes a limit pin 70, which is disposed through the limit hole 103 and inserted into the limit slot 51. The limit pin 70 can limit the rotation of the force sensor 50 relative to the caliper body 10, thereby improving detection reliability.

[0052] Optionally, the limiting pin 70 may rest against the bottom of the limiting groove 51 , thereby pressing the force sensor 50 onto the second cavity wall 1012 or the annular protrusion 11 to limit the radial movement of the force sensor 50 .

[0053] Optionally, the force sensor 50 further includes a peripheral side surface that abuts against the second cavity wall 1012. In this way, the force sensor 50 can be restricted in radial movement by the annular protrusion 11 and the second cavity wall 1012. A limiting groove 51 can be provided on the peripheral side surface of the force sensor 50, and the limiting hole 103 extends through the second cavity wall 1012 to facilitate installation.

[0054] Optionally, a step structure is formed on the wall of the limiting hole 103. The step structure has a table 1031 perpendicular to the axis of the limiting hole 103. The limiting pin 70 includes a limiting rod 71 and a limiting cap 72 connected to the end of the limiting rod 71. The limiting cap 72 abuts against the table 1031 of the step structure, and the limiting rod 71 is inserted into the limiting groove 51. This step structure can limit the axial displacement of the limiting pin 70. The limiting rod 71 can be provided with an external thread, and the groove wall of the limiting groove 51 can be provided with an internal thread. The limiting rod 71 and the limiting groove 51 are threadedly connected through the cooperation of the external and internal threads, thereby improving the reliability of the connection between the limiting rod 71 and the force sensor 50.

[0055] See also Figure 2 and Figure 4 In some embodiments, the caliper body 10 is provided with a connection hole 105 that connects the accommodating cavity 101 with the external space. The force sensor 50 is provided with a conductive protrusion 52 that extends through the connection hole, and the actuator housing 20 is electrically connected to the conductive protrusion 52. In this way, the force sensor 50 is electrically connected through the electrical connection between the actuator housing 20 and the conductive protrusion 52. When the force sensor 50 and the caliper body 10 are positioned using the first and second positioning structures, the conductive protrusion 52 can also be plugged into the connection hole. The connection hole can be either a through hole 102 or a blind hole, without limitation.

[0056] Specifically, the conductive protrusion 52 includes a protrusion 521 protruding from the first surface 501 and a probe 522 slidably connected to the protrusion 521. The probe 522 is elastic. A metal sheet 21 is provided on the actuator housing 20. When the conductive protrusion 52 is mated with the connection hole, the probe 522 elastically abuts against the metal sheet 21, thereby achieving stable contact with the metal sheet 21. The actuator housing 20 has an electrical connection protrusion 22 protruding therefrom, and the metal sheet 21 is provided on the electrical connection protrusion 22.

[0057] Optionally, a groove may be formed at the top of the protrusion 521 , and the probe 522 is slidably connected in the groove. A spring may be provided between the probe 522 and the bottom of the groove to provide elastic force.

[0058] See also Figure 3 and Figure 6 In some embodiments, a first positioning structure is provided on the caliper body 10, and a second positioning structure is provided on the actuator housing 20. The first positioning structure and the second positioning structure are plugged into each other. When the caliper body 10 and the actuator housing 20 are connected, the first and second positioning structures are plugged into each other, and the conductive protrusions 52 can abut against the metal sheet 21, thereby improving electrical connection reliability.

[0059] Optionally, the first positioning structure includes a positioning groove 104 formed on the caliper body, and the second positioning structure includes a positioning post 23 protruding from the actuator housing 20, with the positioning post 23 plugged into the positioning groove 104. In this way, the actuator housing 20 can be positioned relative to the caliper body 10 through the plug-in fit between the positioning post 23 and the positioning groove 104.

[0060] See also Figure 2 and Figure 3 In some embodiments, the brake further includes a shaft retaining ring 81 connected to the screw body 41 and protruding from one end of the through hole 102. When the piston moves from the braking position to the starting position, the piston exerts an axial pulling force on the ball screw 40 away from the motor. The shaft retaining ring 81 is used to prevent the screw body 41 from moving out of the through hole 102 toward the accommodating cavity 101.

[0061] Optionally, a connecting groove 401 is provided on the circumferential side surface of one end of the rotating portion 412 of the screw body 41 facing away from the screw portion, and the shaft retaining ring 81 is sleeved in the connecting groove 401, and the outer annular surface of the shaft retaining ring 81 protrudes from the notch of the connecting groove 401, and the outer diameter of the retaining ring portion is larger than the aperture of the through hole 102. In this way, the retaining ring can limit the ball screw 40 from escaping from the through hole 102 when the ball screw 40 is subjected to axial pulling force away from the motor.

[0062] Optionally, the brake further includes an elastic member 82 clamped between the shaft retaining ring 81 and the mounting surface 1013. The elastic member 82 abuts against both the shaft retaining ring 81 and the mounting surface 1013 to eliminate the gap between the shaft retaining ring 81 and the mounting surface 1013, making the brake structure more compact and preventing the ball screw 40 from shaking relative to the caliper body 10.

[0063] Optionally, the elastic member 82 is a disc spring, which has a certain rigidity and also provides support for the shaft retaining ring 81. Of course, in other embodiments, the elastic member 82 can also be a spring, a rubber pad, etc., which is not limited here.

[0064] In order to prevent the ball screw 40 from rotating and causing the elastic part 82 to rotate, thereby causing friction between the elastic part 82 and the mounting surface 1013, the brake optionally also includes a third bearing 83 arranged between the elastic part 82 and the mounting surface 1013. The third bearing 83 is also a plane bearing. The elastic part 82 realizes relative rotation with the mounting surface 1013 through the third bearing 83, thereby avoiding friction with the mounting surface 1013.

[0065] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.

Claims

1. A brake, characterized in that: include: The caliper body has a receiving cavity and a through hole connecting the receiving cavity with the external space, and the inner wall of the receiving cavity is provided with an annular protrusion surrounding the through hole; A first bearing is sleeved in the annular protrusion; A ball screw, comprising a screw body and a limiting protrusion sleeved on the screw body, wherein the screw body is sleeved in the first bearing and passes through the through hole, and the limiting protrusion is located in the accommodating cavity; A force sensor is sleeved on the outside of the annular protrusion; The second bearing is sleeved on the outside of the screw rod body and clamped between the limiting protrusion and the force sensor.

2. The brake according to claim 1, wherein The force sensor is provided with a limiting groove, the caliper body is provided with a limiting hole communicating with the accommodating cavity and the external space, and the brake further comprises a limiting pin, which is passed through the limiting hole and inserted into the limiting groove.

3. The brake according to claim 2, wherein: A step structure is formed on the hole wall of the limiting hole, and the step structure has a table surface perpendicular to the axis of the limiting hole. The limiting pin includes a limiting rod and a limiting cap connected to the end of the limiting rod, the limiting cap rests on the table surface of the step structure, and the limiting rod is inserted into the limiting groove.

4. The brake according to claim 1, wherein: The caliper body is provided with a connection hole connecting the accommodating cavity and the external space, the force sensor is provided with a conductive protrusion, and the conductive protrusion is passed through the connection hole. The brake also includes an actuator housing docked with the caliper body, and the actuator housing is electrically connected to the conductive protrusion.

5. The brake according to claim 4, wherein: The clamp body is provided with a first positioning structure, and the actuator housing is provided with a second positioning structure, and the first positioning structure is plugged into the second positioning structure.

6. The brake according to claim 5, wherein: The first positioning structure includes a positioning groove formed on the caliper body, and the second positioning structure includes a positioning column protruding from the actuator housing, wherein the positioning column is inserted into the positioning groove.

7. The brake according to claim 1, wherein: The brake further comprises a shaft retaining ring connected to the screw rod body and protruding from one end of the through hole, wherein the shaft retaining ring is used to restrict the screw rod body from escaping from the through hole in the direction of the accommodating cavity.

8. The brake according to claim 7, wherein: The caliper body has a mounting surface, the through hole penetrates to the mounting surface, and the brake further includes an elastic member clamped between the shaft retaining ring and the mounting surface.

9. The brake according to claim 8, wherein A third bearing is provided between the elastic member and the mounting surface.

10. A vehicle, characterized in that: The invention comprises a vehicle body and the brake according to any one of claims 1 to 9, wherein the brake is arranged on the vehicle body.

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