brake-by-wire brake system

Abstract

The application relates to an automobile brake, in particular to a brake-by-wire device, which comprises a caliper body, a brake piece and a screw mechanism arranged on the caliper body and used for driving the brake piece to move for braking; wherein the screw mechanism comprises a screw rod, a piston head integrally formed on one end of the screw rod and a nut arranged outside the screw rod, the piston head is used for cooperating with the brake piece, and the nut is used for being connected with a driving device. The brake-by-wire device has the advantages that the nut rotation of the screw mechanism enables the screw rod to move linearly, the piston head is integrally formed with the screw rod, the structural strength of the product is improved, the braking force is increased, the parts are reduced, the assembly is facilitated, the cost is reduced, the brake-by-wire device can meet the higher and higher requirements.

Description

Technical Field

[0001] This application relates to automotive brakes, and more specifically to a brake-by-wire device. Background Technology

[0002] Brakes are crucial components for vehicle braking, primarily including hydraulic brakes and brake-by-wire systems. Compared to hydraulic brakes, brake-by-wire systems (i.e., electromechanical brakes) are more conducive to intelligent control of the entire vehicle system, offering faster response times and enabling higher levels of autonomous driving. With the development of the automotive industry and the field of autonomous driving, the demand for electronic control components in the automotive industry is expanding, and the requirements are increasing, such as for brake-by-wire systems. However, traditional brake-by-wire systems suffer from problems such as low structural strength, weak braking force, low transmission efficiency, low precision, low stability and reliability, short service life, inconvenient assembly, and high cost, failing to meet the increasingly stringent requirements for brake-by-wire systems. Utility Model Content

[0003] The purpose of this application is to provide a brake-by-wire device that improves the structural strength of the product, increases braking force, and reduces costs.

[0004] To solve at least one of the above-mentioned technical problems, this application adopts the following technical solution:

[0005] A brake-by-wire device according to an embodiment of this application includes: a clamp body; a brake element; and a lead screw mechanism disposed on the clamp body for driving the brake element to move and perform braking; wherein the lead screw mechanism includes a lead screw, a piston head integrally formed at one end of the lead screw, and a nut disposed outside the lead screw, the piston head being used to cooperate with the brake element, and the nut being used to connect with a drive device.

[0006] In one possible implementation, the clamp body is provided with a mounting through hole for accommodating the lead screw mechanism, and a bearing that mates with the nut is provided in the mounting through hole. The braking element is located outside one end of the mounting through hole.

[0007] In one possible implementation, the bearing includes a thrust bearing, a collar is formed on the outer wall of the nut, a first spherical structure is provided at one axial end of the collar, a second spherical structure is provided at one end of the thrust bearing for cooperating with the first spherical structure, and a mating surface is provided in the mounting through hole to abut against the other end of the thrust bearing.

[0008] In one possible implementation, the bearing also includes a ball bearing, with a collar located between the thrust bearing and the ball bearing, and the inner ring structure of the ball bearing integrally formed on the outer wall of the nut.

[0009] In one possible implementation, the brake-by-wire device of this application further includes: a dust cover disposed outside the piston head; wherein the dust cover is an elastic component, and the dust cover is sealed and fitted with the outer side wall of the piston head and the inner wall of the mounting through hole respectively; the outer side wall of the piston head is provided with a first annular mounting groove that mates with the dust cover; one end of the mounting through hole is provided with a second annular mounting groove for mates with the dust cover; the dust cover is capable of elastic deformation as the piston head moves.

[0010] In one possible implementation, the end of the nut furthest from the piston head is provided with a connecting portion for connection with the drive device, the outer diameter of the connecting portion being smaller than the outer diameter of the nut.

[0011] In one possible implementation, ball bearings are provided between the lead screw and the nut.

[0012] In one possible implementation, the nut is provided with a process hole for setting up a cylindrical channel for ball circulation.

[0013] In one possible implementation, a positioning groove is provided at the end of the piston head near the brake element, and a positioning part is provided on the brake element for cooperating with the positioning groove.

[0014] In one possible implementation, the outer diameter of the piston head is larger than the inner diameter of the nut, and a limiting protrusion corresponding to the piston head is provided on the end face of the nut near the piston head.

[0015] The above-mentioned technical solution of this application has at least one of the following beneficial effects:

[0016] The wire-controlled brake according to this application includes a clamp body, a brake element, and a lead screw mechanism. The lead screw mechanism is mounted on the clamp body and is used to drive the brake element to move for braking. The lead screw mechanism includes a lead screw, a piston head integrally formed at one end of the lead screw, and a nut disposed outside the lead screw. The piston head is used to cooperate with the brake element, and the nut is used to connect to a drive device. When braking is required, the drive device drives the nut to rotate, causing the lead screw to move linearly. The piston head moves along with the lead screw, pushing the brake element to move and achieve braking. Thus, in the wire-controlled brake of this application, the rotation of the nut in the lead screw mechanism causes the lead screw to move linearly, and the piston head is integrally formed with the lead screw, thereby improving the structural strength of the product, increasing the braking force, reducing the number of parts, facilitating assembly, reducing costs, and meeting the increasingly higher requirements of wire-controlled brakes.

[0017] In addition, unless otherwise specified in the technical solution of this application, the technical solution can be implemented by conventional means in the field. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional structural schematic diagram of a brake-by-wire device according to one embodiment of this application;

[0020] Figure 2 This is a cross-sectional structural schematic diagram of a lead screw mechanism and a thrust bearing according to one embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the lead screw and piston head according to one embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of a nut according to one embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the thrust bearing according to one embodiment of this application.

[0024] Explanation of the labels in the attached drawings:

[0025] Lead screw 100;

[0026] Nut 200; Collar 201; First spherical structure 202; Limiting protrusion 203; Connecting part 204; Process hole 205;

[0027] Piston head 300; First annular mounting groove 301; Positioning groove 302;

[0028] 400 ball bearings;

[0029] Clamp body 1000; mounting through hole 1100;

[0030] Brake component 2000;

[0031] Thrust bearing 3000; Second spherical structure 3100;

[0032] Ball bearing 4000;

[0033] Dust cover 5000. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only some, not all, of the embodiments of this application, and are used merely to explain this application and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "both ends," "both sides," "bottom," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," "upper-level," "lower-level," "main," and "secondary," etc., are used for descriptive purposes only and can be simply used to more clearly distinguish different components, and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral molding; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] See Figure 1 As shown, a wire-controlled brake according to an embodiment of this application is schematically illustrated, which may include: a clamp body 1000, a brake element 2000, and a lead screw mechanism.

[0038] The lead screw mechanism is mounted on the clamp body 1000 and is used to drive the brake component 2000 to move for braking. The lead screw mechanism includes a lead screw 100, a nut 200, and a piston head 300. The nut 200 is located outside the lead screw 100, and the piston head 300 is integrally formed at one end of the lead screw 100. The piston head 300 is used to cooperate with the brake component 2000, and the nut 200 is used to connect to the drive device. The piston head 300 and the lead screw 100 can be integrally formed by casting, machining, 3D printing, etc. The brake component 2000 can be a friction plate, and the drive device can be a drive motor or a drive motor cooperating with a planetary gear mechanism.

[0039] When braking is required, the drive device drives the nut 200 to rotate. The rotation of the nut 200 causes the lead screw 100 to move in a stable linear motion. The piston head 300 moves together with the lead screw 100, thereby pushing the friction pad to move. This allows the friction pad to brake the brake disc stably. Moreover, the piston head 300 and the lead screw 100 are integrally formed, resulting in high structural strength and increased braking force.

[0040] Therefore, in the wire-controlled brake of this application, the rotation of the nut 200 of the lead screw mechanism causes the lead screw 100 to move linearly, and the piston head 300 is integrally formed with the lead screw 100, thereby improving the structural strength of the product, increasing the braking force, reducing the number of parts, facilitating assembly, reducing costs, and meeting the increasingly higher requirements of wire-controlled brakes.

[0041] In some embodiments, reference Figure 1 , Figure 2 As shown, the clamp body 1000 is provided with a mounting through hole 1100 for accommodating the lead screw mechanism. A bearing that mates with the nut 200 is installed inside the mounting through hole 1100. The brake element 2000 is located outside one end of the mounting through hole 1100. The drive device drives the nut 200 to rotate, and the bearing ensures that the nut 200 rotates smoothly and accurately. The rotation of the nut 200 causes the lead screw 100 to move linearly, thereby causing the piston head 300 to push the brake element 2000 to move, achieving braking with higher precision, stability, and reliability.

[0042] Further, refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the bearing includes a thrust bearing 3000. A collar 201 is formed on the outer wall of the nut 200. A first spherical structure 202 is provided at one axial end of the collar 201. A second spherical structure 3100 is provided at one end of the thrust bearing 3000 for cooperating with the first spherical structure 202. A mating surface is provided in the mounting through hole 1100 to abut against the other end of the thrust bearing 3000. Due to factors such as caliper deformation and lateral and vertical wear of the friction plates, the brake-by-wire will generate forces in multiple directions during operation, which can easily have an adverse effect on braking. The thrust bearing 3000 (such as a thrust needle roller bearing) is sleeved on the outside of the nut 200. The second spherical structure 3100 of the thrust bearing 3000 and the first spherical structure 202 of the collar 201 enable the thrust bearing 3000 to better withstand axial loads, improve the rotation of the nut 200, and the spherical contact fit structure has good compensation ability and a certain self-adjusting performance. It can adaptively adjust to overcome forces in multiple directions, reduce stress concentration, ensure better braking, and have higher stability and reliability, thus extending the product's lifespan.

[0043] Further, refer to Figure 1 , Figure 2 , Figure 4 As shown, the bearing also includes a ball bearing 4000, with a collar 201 located between the thrust bearing 3000 and the ball bearing 4000. The ball bearing 4000 can better withstand radial loads, ensuring better rotation of the nut 200. The inner ring structure of the ball bearing 4000 is integrally formed on the outer wall of the nut 200, making the structure more stable and reliable, and eliminating the need for a separate abutment and limiting surface on the outer wall of the nut 200 to mate with the inner ring of the ball bearing 4000. Furthermore, a retaining ring can be installed in the mounting through hole 1100 to limit the outer ring of the ball bearing 4000, or a retaining ring can be installed at the end of the nut 200 away from the piston head 300 to axially limit the nut 200, preventing axial movement of the bearing and the nut 200.

[0044] In some embodiments, reference Figure 1 , Figure 2 , Figure 3 As shown, the wire-controlled brake of this application also includes a dust cover 5000, which is disposed outside the piston head 300. The dust cover 5000 is an elastic component (e.g., having a bending elastic deformation portion). The dust cover 5000 is sealed and fitted with the outer side wall of the piston head 300 and the inner wall of the mounting through hole 1100, respectively. The outer side wall of the piston head 300 is provided with a first annular mounting groove 301 that mates with the dust cover 5000, and one end of the mounting through hole 1100 is provided with a second annular mounting groove for mates with the dust cover 5000. The dust cover 5000 can elastically deform as the piston head 300 moves. When the lead screw 100 and the piston head 300 move linearly together, the elastic deformation of the dust cover 5000 not only ensures the stable movement of the piston head 300, but also prevents dust from entering the mounting through hole 1100 and causing adverse effects on the lead screw mechanism and bearings, making it safer, more reliable, and improving the service life of the product.

[0045] In some embodiments, reference Figure 2 , Figure 4As shown, the end of the nut 200 away from the piston head 300 is provided with a connecting portion 204 for connection with the drive device. The thrust bearing 3000 is located between the connecting portion 204 and the collar 201. The outer diameter of the connecting portion 204 is smaller than the outer diameter of the nut 200. Exemplarily, the output shaft of the drive motor is coaxially connected to the sun gear of the planetary gear mechanism, and the planetary gears of the planetary gear mechanism are coaxially connected to the connecting portion 204. The planetary gears are provided with holes for the connecting portion 204 to be inserted. The radial cross-section of the connecting portion 204 and the holes can be polygonal or non-circular with curved edges, ensuring that the nut 200 rotates with the planetary gears. The sun gear can also have a clearance hole corresponding to one end of the lead screw 100, thereby reducing the axial dimension of the brake and making the brake arrangement on the vehicle easier. This results in more convenient operation, etc.

[0046] In some embodiments, reference Figure 2 , Figure 4 As shown, multiple balls 400 are disposed between the lead screw 100 and the nut 200, located in the threaded groove. The nut 200 has a process hole 205 for facilitating the circulation of the balls 400 through a cylindrical channel. This improves transmission accuracy and efficiency, increases contact force, thereby increasing braking force and extending product lifespan.

[0047] In some embodiments, reference Figures 1-3 As shown, a positioning groove 302 is provided at the end of the piston head 300 near the brake member 2000, and a positioning part is provided on the brake member 2000 for cooperating with the positioning groove 302. The positioning groove 302 can be two symmetrically arranged, or two or more evenly distributed along the circumference of the piston head 300, and the positioning groove 302 and the positioning part can correspond one-to-one. Thus, the positioning part of the brake member 2000 is inserted into the positioning groove 302, thereby preventing the brake member 2000 and the piston head 300 from rotating relative to each other circumferentially, ensuring more stable braking.

[0048] In some embodiments, reference Figure 1 , Figure 2 As shown, the outer diameter of the piston head 300 is larger than the inner diameter of the nut 200. A limiting protrusion 203 corresponding to the piston head 300 is provided on the end face of the nut 200 near the piston head 300. The limiting protrusion 203 can be two or more evenly distributed along the circumference of the nut 200. During the linear movement of the nut 200 driving the lead screw 100 away from the brake component 2000, when the piston head 300 encounters the limiting protrusion 203, the lead screw 100 has reached its bottom position, requiring the nut 200 to stop rotating. This facilitates bottom-out detection, preventing damage to components and ensuring greater safety and reliability.

[0049] Based on the various embodiments of this application described above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0050] The above descriptions are merely some embodiments of this application, used only to illustrate the technical solutions of this application, and not to limit it. It should be understood that those skilled in the art can make improvements or substitutions based on the above descriptions without departing from the inventive concept of this application, and all such improvements and substitutions should fall within the protection scope of this application. In this case, all details can be replaced with equivalent elements, and materials, shapes, and sizes can also be arbitrary.

Claims

1. A brake-by-wire device, characterized in that, include: clamp body; Braking components; A lead screw mechanism, mounted on the clamp body, is used to drive the brake element to move for braking; The lead screw mechanism includes a lead screw, a piston head integrally formed at one end of the lead screw, and a nut disposed outside the lead screw. The piston head is used to cooperate with the braking component, and the nut is used to connect with the driving device.

2. The brake-by-wire device according to claim 1, characterized in that, The clamp body is provided with a mounting through hole for accommodating the lead screw mechanism. A bearing that mates with the nut is provided in the mounting through hole. The braking element is located outside one end of the mounting through hole.

3. The brake-by-wire device according to claim 2, characterized in that, The bearing includes a thrust bearing. A collar is formed on the outer side wall of the nut. A first spherical structure is provided at one axial end of the collar. A second spherical structure is provided at one end of the thrust bearing for cooperating with the first spherical structure. An abutment surface is provided in the mounting through hole to abut against the other end of the thrust bearing.

4. The brake-by-wire device according to claim 3, characterized in that, The bearing also includes a ball bearing, and the collar is located between the thrust bearing and the ball bearing. The inner ring structure of the ball bearing is integrally formed on the outer side wall of the nut.

5. The brake-by-wire device according to claim 2, characterized in that, Also includes: A dust cover is provided on the outside of the piston head; The dust cover is an elastic component, and it is sealed to the outer wall of the piston head and the inner wall of the mounting through hole. The outer wall of the piston head is provided with a first annular mounting groove that mates with the dust cover, and one end of the mounting through hole is provided with a second annular mounting groove that mates with the dust cover. The dust cover can elastically deform as the piston head moves.

6. The brake-by-wire device according to claim 1, characterized in that, The end of the nut away from the piston head is provided with a connecting part for connecting to the driving device, and the outer diameter of the connecting part is smaller than the outer diameter of the nut.

7. The brake-by-wire device according to claim 1, characterized in that, A ball bearing is provided between the lead screw and the nut.

8. The brake-by-wire device according to claim 7, characterized in that, The nut is provided with a process hole, which is used to set the cylindrical pipe for the ball circulation.

9. The brake-by-wire device according to claim 1, characterized in that, The piston head is provided with a positioning groove at one end near the brake member, and the brake member is provided with a positioning part for cooperating with the positioning groove.

10. The brake-by-wire device according to claim 1, characterized in that, The outer diameter of the piston head is larger than the inner diameter of the nut, and a limiting protrusion corresponding to the piston head is provided on the end face of the nut near the piston head.

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