Ball screw pair and automobile brake structure

Abstract

The utility model discloses a ball screw pair and an automobile brake structure, the ball screw pair comprises a screw rod, a nut and a ball, the screw rod is provided with reverser mounting grooves, each groove is internally and detachably connected with a reverser, and the design of the reversers enables the ball to smoothly change directions and realize continuous and stable transmission; due to the flat bottom design of the reverser mounting groove, the processing difficulty is reduced, the production efficiency is improved, and the reverser is convenient to mount and replace; the automobile brake structure comprises a ball screw pair, a bearing outer ring and a piston, a ball screw, a bearing and the piston are integrated, installation steps and errors are reduced, and the precision of parts is improved; the piston is in threaded connection with the screw rod, so that mounting and dismounting are facilitated; by optimizing the design of the ball screw pair and the automobile brake structure, the machining difficulty and cost are reduced, the transmission stability and precision are improved, and the installation convenience and reliability of the brake structure are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, and particularly to a ball screw pair and an automobile braking structure. Background Technique

[0002] In the existing mechanical transmission technology, as an efficient and precise transmission device, the ball screw pair is widely used in various mechanical equipment. The ball screw pair converts the rotational motion into a linear motion by the rolling of balls in the thread raceways between the screw rod and the nut, and has the advantages of high transmission efficiency, small wear, and high precision. However, there are some deficiencies in the design and manufacture of traditional ball screw pairs, which limit their further application and development.

[0003] In a traditional ball screw pair, such as the patent solution with the publication number of CN220204569U, the reverser and the screw rod are integrally processed, which results in a complex processing process, large processing difficulty, long processing time, and low production efficiency. At the same time, once the reverser is damaged or needs to be replaced, the entire screw rod often needs to be replaced, increasing the maintenance cost and difficulty.

[0004] In addition, in specific application scenarios such as automobile braking structures, traditional ball screw pairs often need to be complexly assembled and debugged with other components such as bearings and pistons. There are many installation steps, and the errors during the installation process are difficult to control, affecting the accuracy and reliability of the components. At the same time, the connection method between the traditional screw rod and the piston also has problems such as misalignment and difficult installation, increasing the maintenance difficulty and cost. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems existing in the prior art, and provide a ball screw pair and an automobile braking structure. By optimizing the design and installation method of the reverser, the processing difficulty and cost are reduced, and the production efficiency is improved; by adopting a threaded connection method to connect the piston and the screw rod, it is convenient for installation and disassembly, and effectively avoids the problems caused by misalignment during the installation process.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A ball screw pair includes a screw rod, a nut, and balls disposed in the thread raceways of the screw rod; the screw rod is provided with a plurality of reverser installation grooves, each of the reverser installation grooves connects two adjacent thread raceways, and each of the reverser installation grooves is detachably connected with a reverser; the reverser includes an installation block, the top end face of the installation block is provided with a ball return raceway, both ends of the ball return raceway are respectively connected with two adjacent thread raceways, and two limiting rib strips are respectively connected to both sides of the installation block, and the two limiting rib strips are respectively disposed in two corresponding thread raceways for guiding the balls to enter and exit the ball return raceway.

[0008] A plurality of the reversers are evenly distributed along the circumference of the lead screw and are axially arranged at equal intervals.

[0009] When viewed from the top of the mounting block, the ball return raceway is arranged in an S-shaped curve extension to reduce the passing resistance of the balls.

[0010] Both ends of the ball return raceway are respectively tangentally connected to the corresponding thread raceways.

[0011] When viewed from the angle of a half-sectional view of the ball return raceway along its central axis, the bottom contour of the ball return raceway is composed of five parabola curves.

[0012] Convex blocks are provided on the opposite side walls of the mounting block extending outwards for interference connection with the inner wall of the reverser mounting groove.

[0013] The convex block is provided with an inclined surface inclined towards the bottom of the mounting block for smoothly passing through the side wall edge of the reverser mounting groove.

[0014] The lower end portion of the convex block is suspended on the bottom end surface of the mounting block to facilitate resilience.

[0015] An automobile braking structure includes the above ball screw pair; it further includes a bearing outer ring and a piston. The bearing outer ring is sleeved outside the nut, and the two are connected by rolling with steel balls. The piston is detachably connected to one end of the lead screw, and the other end of the lead screw is used to connect a braking drive motor.

[0016] The end of the lead screw is provided with an external thread, the piston is provided with a corresponding internal thread, and the lead screw and the piston are connected by threads.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. By machining a reverser mounting groove with a flat bottom design on the lead screw and manufacturing the reverser separately, the processing difficulty is significantly reduced. Compared with directly machining a complex ball return raceway on the lead screw, it is more simple and rapid, thus shortening the processing time, improving the production efficiency, and reducing the manufacturing cost;

[0019] 2. The ball return raceway is designed by improving and calculating with an S-shaped curve and a fifth-degree parabola equation, which reduces the passing resistance and wear of the balls, and further improves the transmission smoothness and accuracy;

[0020] 3. The design of the reverser mounting groove facilitates the installation and replacement of the reverser, making the maintenance work of the ball screw pair more convenient;

[0021] 4. In the automotive braking structure, the ball screw, bearing, and piston are integrated into one body, reducing the installation steps and errors of the braking assembly, improving the accuracy and reliability of the components, simplifying the structure of the braking system, and enhancing the braking efficiency.

[0022] 5. The threaded connection between the piston and the screw rod facilitates installation and disassembly, reducing the maintenance difficulty and cost. Compared with the interference fit method of traditional screw rod and piston processing, the threaded connection method is more convenient and reliable, effectively avoiding problems caused by misalignment during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a cross-sectional view of the ball screw pair in the embodiment of the present application;

[0025] Figure 2 It is a structural diagram of the screw rod in the embodiment of the present application, where one reverser is in a disassembled state;

[0026] Figure 3 It is a structural diagram of the reverser in the embodiment of the present application;

[0027] Figure 4 It is a cross-sectional view of the reverser along its axis in the embodiment of the present application;

[0028] Figure 5 It is a schematic diagram of the automotive braking structure in the embodiment of the present application, where the piston is shown in a partial cross-section;

[0029] In the figure: 1. Screw rod; 2. Nut; 3. Reverser installation groove; 4. Reverser; 4.1. Installation block; 4.2. Ball return raceway; 4.3. Limiting rib; 4.4. Protrusion; 5. Bearing outer ring; 6. Piston. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0032] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] One aspect of the present application provides a ball screw pair, which includes a lead screw 1, a nut 2, and balls disposed in the thread raceway of the lead screw 1. The lead screw 1 is provided with a plurality of reverser mounting grooves 3. Each reverser mounting groove 3 connects two adjacent thread raceways, and a reverser 4 is detachably connected in each reverser mounting groove 3. The design of the reverser 4 enables the balls to smoothly change direction between the thread raceways, thereby achieving continuous and stable transmission.

[0035] The reverser mounting groove 3 is machined on the lead screw 1. Since the reverser mounting groove 3 has a flat bottom design, it can be machined simply by translational milling. Compared with directly machining a complex ball return raceway on the lead screw 1, this method significantly reduces the machining difficulty, shortens the machining time, and improves the production efficiency. The design of the reverser mounting groove 3 also facilitates the installation and replacement of the reverser 4, making maintenance more convenient.

[0036] The reverser 4 includes a mounting block 4.1, and a ball return raceway 4.2 is provided on the top end face of the mounting block 4.1. Both ends of the ball return raceway 4.2 are respectively connected to two adjacent thread raceways, ensuring that the balls can smoothly enter the ball return raceway 4.2 from the thread raceways, and after changing directions therein, enter another thread raceway. Limiting rib strips 4.3 are respectively connected to both sides of the mounting block 4.1, and the two limiting rib strips 4.3 are respectively arranged in two corresponding thread raceways for guiding the balls to enter and exit the ball return raceway 4.2. This design ensures the stability and reliability of the balls during the transmission process.

[0037] A number of reversers 4 are evenly distributed along the circumference of the lead screw 1 and are axially equidistantly arranged. This layout makes the movement of the balls on the lead screw 1 more uniform, reducing the transmission errors and vibrations caused by uneven distribution of the reversers. Specifically, four reverser mounting grooves 3 can be machined on the lead screw 1, and these four reverser mounting grooves 3 are evenly distributed at 90° on the circumference. After installing the reverser 4, a four-column closed-loop thread curve is formed, and each thread raceway is filled with steel balls. During operation, the balls rotate and reciprocate on each column of raceways, achieving continuous and stable transmission.

[0038] When viewed from above the mounting block 4.1, the ball return raceway 4.2 is extended in an S-shaped curve. This design reduces the passing resistance of the balls, making the movement of the balls in the ball return raceway 4.2 smoother. At the same time, both ends of the ball return raceway 4.2 are respectively tangentially connected to the corresponding thread raceways, ensuring a smooth transition between the thread raceways and the ball return raceway.

[0039] Furthermore, when viewed at the angle of a half-sectional view of the ball return raceway 4.2 along its axis, the bottom contour of the ball return raceway 4.2 consists of five parabolic curves. This design is obtained through improved calculation using a fifth-degree parabolic equation, ensuring a more reasonable movement trajectory of the balls in the ball return raceway 4.2 and reducing the wear and noise of the balls.

[0040] To facilitate the installation and fixation of the reverser 4 in the reverser mounting groove 3, convex blocks 4.4 are provided on the opposite side walls of the mounting block 4.1 extending outward. The convex blocks 4.4 are used for interference connection with the inner wall of the reverser mounting groove 3, ensuring the stability and reliability of the reverser 4 during the transmission process. The convex blocks 4.4 are provided with inclined surfaces inclined towards the bottom of the mounting block 4.1. This design enables the reverser 4 to smoothly pass through the side wall edge of the reverser mounting groove 3 during the installation process, reducing the installation difficulty.

[0041] In addition, the lower end part of the convex block 4.4 is suspended from the bottom end face of the mounting block 4.1. This design makes the convex block 4.4 have a certain elasticity during the installation process, capable of adapting to minor changes in the inner wall of the reverser mounting groove 3, further improving the installation convenience and reliability.

[0042] The present application also provides an automotive braking structure, which includes the above-mentioned ball screw pair, as well as the outer ring 5 of the bearing and the piston 6. The outer ring 5 of the bearing is sleeved outside the nut 2, and the two are connected by rolling with steel balls. The piston 6 is detachably connected to one end of the screw rod 1, and the other end of the screw rod 1 is used to connect to the braking drive motor. This design integrates the ball screw, bearing and piston, reduces the installation steps of the braking assembly, reduces the error during installation, and improves the precision of the components.

[0043] In the automotive braking structure, the ball screw pair plays a role in converting the rotational motion of the motor into the axial motion of the piston. When the motor drives the nut 2 to rotate, the steel balls roll in the closed loop raceway formed by the nut 2 and the screw thread raceway of the screw rod. Each time the steel balls pass over the shoulder of the nut 2 in one revolution, the rotational torque of the nut 2 is converted into the axial thrust of the screw rod 1 through the steel balls, driving the piston 6 to move axially. The movement of the piston 6 squeezes the hydraulic oil, thereby realizing the braking action of the brake caliper.

[0044] The outer ring 5 of the bearing is sleeved outside the nut 2 and is connected to the nut 2 by rolling with steel balls. This design enables the nut 2 to maintain a stable axial position during rotation, while reducing the friction and wear between the nut 2 and the outer ring 5 of the bearing. The outer ring 5 of the bearing is also fixed to the side wall structure of the planetary gear, ensuring the stability and reliability of the transmission.

[0045] The end of the screw rod 1 is provided with an external thread, and the piston 6 is provided with a corresponding internal thread. The screw rod 1 and the piston 6 are connected by threads. This connection method is convenient for installation and disassembly, and can effectively avoid problems caused by misalignment during installation. Compared with the interference fit method of processing the traditional screw rod and piston, the thread connection method is more convenient and reliable.

[0046] When the braking drive motor is started, the motor drives the outer ring of the bearing end of the ball screw pair to rotate through the planetary gear and the planetary pin. Since the nut 2 and the outer ring 5 of the bearing are connected by rolling with steel balls, the nut 2 also rotates accordingly. The rotation of the nut 2 causes the steel balls to roll in the thread raceways of the nut 2 and the screw rod 1, and converts the rotational torque into the axial thrust of the screw rod 1. The axial thrust of the screw rod 1 pushes the piston 6 to move forward, and the movement of the piston 6 squeezes the hydraulic oil, thereby generating a braking force. When the motor rotates in reverse, the braking process is opposite, and the piston 6 moves backward to release the braking force.

[0047] In summary, the ball screw pair provided by the present application and its application in the automotive braking structure have significant advantages and effects. First, by machining the reverse device installation groove 3 on the lead screw 1 and manufacturing the reverse device 4 separately, the processing difficulty and cost are reduced, and the production efficiency is improved. Second, the S-shaped ball return raceway of the reverse device 4 and the ball return raceway design obtained by the improved calculation of the fifth-degree parabola equation reduce the passing resistance and wear of the balls, and improve the smoothness and accuracy of transmission. Third, in the automotive braking structure, the ball screw, bearing and piston are integrated, reducing the installation steps and errors of the braking assembly, and improving the accuracy and reliability of the components. Finally, the threaded connection method between the piston 6 and the lead screw 1 is convenient for installation and disassembly, reducing the maintenance difficulty and cost.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball screw pair, comprising a lead screw (1), a nut (2) and balls arranged in the thread raceway of the lead screw (1); characterized in that, The lead screw (1) is provided with a plurality of reverse device installation grooves (3), each of the reverse device installation grooves connects two adjacent thread raceways, and a reverse device (4) is detachably connected in each of the reverse device installation grooves; the reverse device (4) includes an installation block (4.1), a return ball raceway (4.2) is provided on the top end face of the installation block (4.1), both ends of the return ball raceway (4.2) are respectively connected with two adjacent thread raceways, limiting rib strips (4.3) are respectively connected to both sides of the installation block (4.1), and the two limiting rib strips (4.3) are respectively arranged in two corresponding thread raceways for guiding the balls to enter and exit the return ball raceway.

2. A ball screw pair according to claim 1, wherein A plurality of the reverse devices (4) are evenly distributed along the circumference of the lead screw (1) and are axially arranged at equal intervals.

3. A ball screw pair according to claim 1, characterized in that, When viewed from above the installation block (4.1), the return ball raceway (4.2) extends in an S-shaped curve to reduce the passing resistance of the balls.

4. A ball screw pair according to claim 3, characterized in that, Both ends of the return ball raceway (4.2) are respectively tangentially connected with the corresponding thread raceways.

5. A ball screw pair according to claim 1, characterized in that, When viewed at an angle of half-sectional view of the return ball raceway (4.2) along its central axis, the bottom contour of the return ball raceway (4.2) is composed of five parabolic curves.

6. A ball screw pair according to claim 1, characterized in that Convex blocks (4.4) are extended outwards from the opposite side walls of the installation block (4.1) for interference connection with the inner wall of the reverse device installation groove (3).

7. A ball screw pair according to claim 6, characterized in that, The convex blocks (4.4) are provided with inclined surfaces inclined towards the bottom of the installation block (4.1) for smoothly passing through the side wall edges of the reverse device installation groove (3).

8. A ball screw pair according to claim 7, characterized in that, The lower end portions of the convex blocks (4.4) are suspended from the bottom end face of the installation block (4.1) for easy resilience.

9. An automotive braking structure, characterized in that, It includes the ball screw pair according to any one of claims 1 to 8; it further includes a bearing outer ring (5) and a piston (6), the bearing outer ring (5) is sleeved outside the nut (2), and the two are connected by rolling with steel balls, the piston (6) is detachably connected to one end of the lead screw (1), and the other end of the lead screw (1) is used for connecting a braking drive motor.

10. A vehicle braking structure according to claim 9, characterized in that, External threads are provided at the ends of the lead screw (1), corresponding internal threads are provided on the piston (6), and the lead screw (1) and the piston (6) are threadedly connected.

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