Ball screw internal circulation structure for automobile braking system

Abstract

The utility model discloses a ball screw internal circulation structure for an automobile braking system, which comprises a screw, a nut, a ball and a reverser, the nut is sleeved on the outer side of the screw, and the ball is arranged in a threaded raceway between the screw and the nut; a plurality of reverser mounting grooves are formed in the circumferential direction of the nut, and a reverser is detachably arranged in each reverser mounting groove; the reverser comprises a mounting block, a ball return groove is formed in the bottom of the mounting block, and the two ends of the ball return groove are tangentially connected with the two adjacent threaded roller paths respectively; a plurality of elastic steps are distributed at intervals along the periphery of the top of the mounting block in a surrounding mode, an annular groove is formed in the inner wall of the reverser mounting groove, and the annular groove is matched with the elastic steps in a clamped mode; the reverser is installed from outside to inside, is easy to assemble, high in strength and low in noise, and improves stability and reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive braking, and particularly to an internal circulation structure of a ball screw for an automotive braking system. Background Art

[0002] In an automotive braking system, the ball screw pair is a key component, and its performance and structure have an important impact on the stability and efficiency of the entire system. At present, the ball screw pair is mainly divided into two structures: internal circulation and external circulation. However, both of these structures have significant defects and deficiencies.

[0003] Due to its complex structure, the external circulation structure includes multiple parts such as a ball screw, a ball nut, an external circulation tube, a circulation tube pressing piece, a pressing piece screw, and steel balls, resulting in a cumbersome manufacturing process and low efficiency. Especially the processing of the ball nut circulation groove not only takes a long time but also increases the manufacturing cost. In addition, the external circulation structure is also more complex in terms of assembly and maintenance, which is not conducive to improving production efficiency and reducing costs.

[0004] Although the internal circulation structure is relatively simple, including a ball screw, a ball nut, a reverser, and multiple balls, there are still many problems in actual applications. First, due to the small aperture of the ball nut for the automotive braking system, it is difficult to install the reverser of the traditional internal circulation structure. The traditional manual assembly method cannot be achieved, and tools and tooling must be used for installation, which is not only inefficient but also easily scratches the ball return curve groove of the reverser, resulting in poor quality and reduced accuracy. Second, due to the aperture limitation, the thickness of the internal circulation reverser is relatively thin, and its strength and service life are greatly reduced. Under the long-term high-speed operation in the automotive braking system, the reverser is very likely to be worn through or damaged, posing a great potential hazard to the service life of the automotive braking system. Summary of the Invention

[0005] The purpose of the present utility model is to provide an internal circulation structure of a ball screw for an automotive braking system in view of the problems existing in the prior art. The reverser adopts an installation method from the outside to the inside, which is easy to assemble, has high strength, low noise, and improves stability and reliability.

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

[0007] A ball screw internal circulation structure for an automotive braking system, comprising a screw rod, a nut, balls, and a reverser. The nut is sleeved outside the screw rod, and the balls are arranged in the thread raceway between the screw rod and the nut. A plurality of reverser mounting grooves are provided circumferentially on the nut, and a reverser is detachably provided in each reverser mounting groove. The reverser includes a mounting block, and a ball return groove is provided at the bottom of the mounting block. The two ends of the ball return groove are respectively tangentally connected to two adjacent thread raceways. A plurality of elastic steps are arranged at intervals around the outer circumference of the top of the mounting block, and an annular groove is provided on the inner wall of the reverser mounting groove, and the annular groove is in snap-fit with the plurality of elastic steps.

[0008] An inclined wall is provided at the bottom of the elastic step, and an inclined angle is provided on the circumferential side of the top of the reverser mounting groove.

[0009] A boss is provided in the middle of the top of the mounting block, and the distances between the boss and each of the elastic steps are the same.

[0010] A sound insulation mud block is connected to the top of the boss, and the sound insulation mud block is filled in the reverser mounting groove.

[0011] Blocks are respectively provided on both sides of the mounting block where the ball return groove is located, and the two blocks are respectively located in two adjacent thread raceways. One of the blocks is used to guide the ball into the ball return groove, and the other block is used to guide the ball out of the ball return groove.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. Adopting an installation method from the outside to the inside, through the snap-fit of the elastic steps and the annular groove, the installation process of the reverser is made more simple and efficient. At the same time, the visualization degree of installation is improved, and the manufacturing cost is reduced.

[0014] 2. The thickness of the reverser is increased by nearly twice, greatly enhancing its strength and service life, effectively avoiding the risk of wear and breakage, and improving the stability and reliability of the entire ball screw internal circulation structure.

[0015] 3. No tools or tooling are required during the installation process of the reverser, avoiding the risk of scratches caused by contact with metal objects, and ensuring the quality and accuracy of the ball return curve groove.

[0016] 4. The sound insulation mud block connected to the top of the boss is composed of epoxy putty and curing agent, and has good sound insulation and shock absorption properties, effectively isolating the noise generated during the operation of the ball screw and providing additional shock absorption effects. Description of the Drawings

[0017] 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 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 also be obtained based on these drawings.

[0018] Figure 1 Structural schematic diagram of the ball screw in the embodiment of the present application;

[0019] Figure 2 Structural schematic diagram of the ball screw in the embodiment of the present application, in which one reverse device and the sound insulation mud block are in a disassembled state with the nut;

[0020] Figure 3 Structural schematic diagram of the disassembled state of the reverse device and the sound insulation mud block in the embodiment of the present application;

[0021] Figure 4 Cross-sectional view of the ball screw in the embodiment of the present application;

[0022] In the figure: 1, screw rod; 2, nut; 3, ball; 4, reverse device; 4a, mounting block; 4b, ball return groove; 4c, elastic step; 4d, boss; 4e, stop block; 5, reverse device mounting groove; 6, sound insulation mud block. Specific embodiments

[0023] 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 in 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.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "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 invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0025] In addition, terms such as "horizontal" and "vertical" do not require the components 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.

[0026] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connected", and "connected" 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 it 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.

[0027] This embodiment aims at the problems in the prior art and provides an internal circulating structure of a ball screw for an automotive braking system, including a screw rod 1, a nut 2, balls 3, and a reverse device 4. The nut 2 is sleeved outside the screw rod 1, and the balls 3 are arranged in the thread raceway between the screw rod 1 and the nut 2; a plurality of reverse device installation grooves 5 are provided in the circumferential direction of the nut 2, and a reverse device 4 is detachably provided in each reverse device installation groove 5; the reverse device 4 includes a mounting block 4a, a ball return groove 4b is provided at the bottom of the mounting block 4a, and both ends of the ball return groove 4b are tangentially connected to two adjacent thread raceways respectively; a plurality of elastic steps 4c are arranged at intervals around the outer circumference of the top of the mounting block 4a, and an annular groove 5a is provided on the inner wall of the reverse device installation groove 5, and the annular groove 5a is in snap-fit with the plurality of elastic steps 4c.

[0028] Specifically, the reverse device in this embodiment adopts an installation method from the outside to the inside, and the elastic steps 4c at the top of the mounting block 4a are in snap-fit with the annular groove 5a on the inner wall of the reverse device installation groove 5 to achieve stable installation. Compared with the traditional reverse device structure, the reverse device installation method in this embodiment significantly improves the installation efficiency and visualization degree, and reduces the manufacturing cost.

[0029] Since there is no need to consider the problem of the small diameter of the ball nut hole, the thickness of the reverse device in this embodiment is increased by nearly twice, thereby greatly enhancing the strength and service life of the reverse device, and effectively avoiding the risk of wear and breakage.

[0030] In addition, no tools or tooling are required during the installation of the reverse device in this embodiment, avoiding the risk of scratches caused by contact with metal objects, and ensuring the quality and accuracy of the ball return curve groove.

[0031] The installation of the reverse device in this embodiment does not require any tools or tooling, so it will not be scratched by contact with metal objects, avoiding the risk of scratches, and ensuring the quality and accuracy.

[0032] In some embodiments, an inclined wall is provided at the bottom of the elastic step 4c, and bevels are provided on the circumferential side of the top of the inverter mounting groove 5. The design of the inclined wall and the bevels enables the elastic step 4c to slide more smoothly into the annular groove 5a of the inverter mounting groove 5 when installing the inverter 4, achieving a tighter snap fit. This not only facilitates the installation of the inverter but also ensures its stability and reliability during operation.

[0033] In some embodiments, a boss 4d is provided in the middle of the top of the mounting block 4a, and the distances between the boss 4d and each elastic step 4c are the same. During the installation of the inverter 4, the boss 4d serves as a stable pressing point, providing a clear and stable force application area for the operator, making the installation process simpler and ensuring that the inverter can be accurately installed in the predetermined position. Secondly, the boss 4d also provides crucial limiting support for each elastic step 4c. During the process of pressing the inverter into the inverter mounting groove 5, the boss 4d prevents a certain elastic step 4c from being overly deformed due to excessive force, thus avoiding the risk of damage.

[0034] In some embodiments, a sound insulation mud block 6 is connected to the top of the boss 4d, and the sound insulation mud block 6 is filled in the inverter mounting groove 5. The sound insulation mud block 6 is composed of epoxy putty and curing agent and has good sound insulation and shock absorption properties. When installing the inverter 4, the sound insulation mud block 6 is filled into the inverter mounting groove 5 and is tightly connected to the boss 4d. In this way, the sound insulation mud block 6 can not only effectively isolate the noise generated during the operation of the ball screw but also provide additional shock absorption effects, protecting the inverter and the entire ball screw structure from vibration damage.

[0035] In some embodiments, stoppers 4e are provided on both sides of the ball return groove 4b of the mounting block 4a, and the two stoppers 4e are respectively located in two adjacent thread races. One of the stoppers 4e is used to guide the ball 3 into the ball return groove 4b, and the other stopper 4e is used to guide the ball 3 out of the ball return groove 4b. When the ball 3 rolls in the thread race, one of the stoppers 4e will guide the ball 3 into the ball return groove 4b to ensure that the ball can smoothly cross two adjacent thread races, while the other stopper 4e is responsible for guiding the ball 3 out of the ball return groove 4b so that it can continue to roll along the next thread race. This ensures the smoothness and stability of the ball 3 during the reciprocating reflux cycle movement.

[0036] In some embodiments, the reverser adopts a PA46 + glass fiber material; the curve of the ball return groove 4b is designed with a large-angle reverse 3D spline curve. The PA46 + glass fiber material combines the excellent mechanical properties of PA46 and the reinforcement effect of glass fiber, making the reverser have higher strength and wear resistance. The large-angle reverse 3D spline curve design of the ball return groove 4b can more smoothly guide the ball 3 from one thread raceway to another, reducing the resistance and wear of the ball 3 during movement, and improving the transmission efficiency and service life of the ball screw.

[0037] 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 to 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 internal circulation structure for an automobile braking system, characterized in that: The invention comprises a screw rod (1), a nut (2), a ball (3) and a deflector (4), wherein the nut (2) is sleeved on the outside of the screw rod (1), and the ball (3) is arranged in a threaded raceway between the screw rod (1) and the nut (2); a plurality of deflector mounting grooves (5) are provided on the circumference of the nut (2), and a deflector (4) is detachably provided in each of the deflector mounting grooves (5); the deflector (4) comprises a mounting block (4a), a ball return groove (4b) is provided at the bottom of the mounting block (4a), and the two ends of the ball return groove (4b) are respectively tangentially connected to two adjacent threaded raceways; a plurality of elastic steps (4c) are arranged at intervals around the outer periphery of the top of the mounting block (4a), and an annular groove (5a) is provided on the inner wall of the deflector mounting groove (5), and the annular groove (5a) is snap-fitted with the plurality of elastic steps (4c).

2. The ball screw internal circulation structure for automobile braking system according to claim 1, characterized in that: The bottom of the elastic step (4c) is provided with an inclined wall, and the top peripheral side of the deflector mounting groove (5) is provided with an inclined angle.

3. The ball screw internal circulation structure for automobile braking system according to claim 1, characterized in that: A boss (4d) is provided in the middle of the top of the mounting block (4a), and the distance between the boss (4d) and each of the elastic steps (4c) is the same.

4. The ball screw internal circulation structure for automobile braking system according to claim 3, characterized in that: The top of the boss (4d) is connected to a sound insulation mud block (6), and the sound insulation mud block (6) is filled in the reverser mounting groove (5).

5. The ball screw internal circulation structure for automobile braking system according to claim 1, characterized in that: The mounting block (4a) is provided with stoppers (4e) on both sides of the ball return groove (4b), and the two stoppers (4e) are respectively located in two adjacent threaded raceways, one of the stoppers (4e) is used to guide the ball (3) into the ball return groove (4b), and the other stopper (4e) is used to guide the ball (3) out of the ball return groove (4b).

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