Split type reverser, ball screw pair and automobile brake structure

Abstract

The utility model discloses a split type reverser, ball screw pair and automobile brake structure, wherein the reverser comprises a mounting block, the mounting block comprises a first half membrane and a second half membrane which are equally divided into two halves along the axis of a ball return channel of the mounting block, the first half membrane and the second half membrane are detachably connected, and the first half membrane is detachably connected with the second half membrane. The reverser structure is convenient to machine, manufacture and demould, meanwhile, the difficulty of maintenance and replacement is reduced, the problem that balls fall off to impact or rub a screw rod due to the fact that a channel is too small when the balls run in a raceway is solved, and the transmission efficiency and stability of a ball screw pair are improved; the automobile brake structure comprises the bearing outer ring, the retainer and the bearing steel ball, meanwhile, the design of the dustproof ring cover is improved, the dustproof ring cover is effectively prevented from falling off, the dustproof effect is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile braking, in particular to a split type reverser, a ball screw pair and an automobile braking structure. Background Art

[0002] With the rapid development of the automotive industry, particularly the continuous advancement of intelligent and electrified technologies, automotive braking systems are facing unprecedented challenges and opportunities. Traditional braking systems are no longer able to meet the higher demands of modern vehicles for braking performance, response speed, and precision. Against this backdrop, ball screw assembly, due to its unique advantages, is gradually showing great potential for application in automotive braking systems.

[0003] As a precision transmission device, the ball screw pair achieves efficient and stable transmission effects by rolling the balls between the screw and the nut. However, in the actual application of automobile braking systems, the ball screw pair still faces some technical difficulties. Among them, the design and manufacture of the reverser is one of the key technologies. Traditional reversers are usually processed and formed as a whole. Due to the difficulty of demolding, the return ball raceway can only be made into a semi-circular arc shape. This structure not only easily causes the balls to hit the screw when they are forced into the reverser, causing noise and wear, but also affects the overall life and transmission efficiency of the ball screw pair.

[0004] Furthermore, as a crucial component of a vehicle's braking system, the dust cover's stability and reliability directly impact the performance of the braking system. Due to limited installation space, traditional dust covers often suffer from issues such as improper press-fitting or undersized fit. This can lead to the cover easily falling off during use, shortening component life and even causing serious consequences such as braking jamming and brake failure. Utility Model Content

[0005] The purpose of the utility model is to address the problems existing in the prior art and provide a split reverser, a ball screw pair and an automobile brake structure, which are easy to process, manufacture and demould, while reducing the difficulty of maintenance and replacement, avoiding the problem of balls falling, colliding or rubbing against the screw when running in the raceway due to the passage being too small, and improving the transmission efficiency and stability of the ball screw pair.

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

[0007] A split deflector is used for returning the balls of a ball screw pair. The deflector includes a mounting block and limiting ribs respectively connected to both sides of the mounting block. A ball return channel is provided on one side of the mounting block, and the two ends of the ball return channel are respectively tangent to the ball groove of the screw rod; the mounting block includes a first half membrane and a second half membrane that are equally divided into two halves along the axis of its ball return channel, and the first half membrane and the second half membrane are detachably connected.

[0008] The cross section of the bead return channel is greater than or equal to 2 / 3 of a circular arc.

[0009] A sliding groove is provided on the end face of the first half membrane close to the second half membrane, the cross-section of the sliding groove is a trapezoid, and the long bottom side of the trapezoid is the bottom side of the sliding groove; the end face of the second half membrane close to the first half membrane is provided with a connecting block that cooperates with the sliding groove.

[0010] A ball screw pair comprises a screw rod, a nut and a ball arranged in a ball groove of the screw rod; and also comprises the above-mentioned deflector, which is fixed in the deflector mounting groove of the nut.

[0011] A vehicle brake structure includes the above-mentioned ball screw pair, and also includes a bearing outer ring, a retaining frame and a bearing steel ball; the bearing steel ball is rollingly installed in the ball groove of the retaining frame, the retaining frame is sleeved on the outside of the nut, and the bearing outer ring is sleeved on the outside of the retaining frame; the bearing outer ring is used to connect to the vehicle body, one end of the nut is used to connect to the rotation drive device, and one end of the screw is used to connect to the brake piston.

[0012] A dust ring cover is provided between the bearing outer ring and the nut, a limiting ring groove is provided on the inner side of the bearing outer ring, and the outer peripheral edge of the dust ring cover is reversely rolled back to form an elastic part, and the elastic part abuts and cooperates with the limiting ring groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The split design divides the deflector into a first half-film and a second half-film, making the shape of each half-film relatively simple, facilitating injection molding. This avoids the demoulding difficulty caused by the complex shape of the return bead channel of traditional deflectors, thereby reducing manufacturing costs and scrap rates.

[0015] 2. The split design allows each half mold to be demoulded independently, avoiding mold adhesion or jamming, and improving demoulding efficiency and part quality;

[0016] 3. The ball return channel is designed to be larger than or equal to 2 / 3 of a circular arc. Compared with traditional deflectors, it can better wrap the balls and prevent the balls from falling, hitting or rubbing against the screw rod.

[0017] 4. The improved dust ring cover structure effectively prevents the dust ring cover from falling and improves the dustproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments 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.

[0019] Figure 1 This is a schematic structural diagram of an inverter in one embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the disassembled structure of the inverter in one embodiment of the present application;

[0021] Figure 3 This is a cross-sectional view of a bead return channel in one embodiment of the present application;

[0022] Figure 4 This is a structural diagram of a vehicle brake structure in one embodiment of the present application;

[0023] Figure 5 A half-section view of a vehicle brake structure in one embodiment of the present application;

[0024] In the figure: 1. Mounting block; 1a. First half diaphragm; 1b. Second half diaphragm; 2. Limiting rib; 3. Return ball channel; 4. Slide groove; 5. Connecting block; 6. Screw rod; 7. Nut; 8. Reverser mounting groove; 9. Bearing outer ring; 10. Cage; 11. Bearing steel ball; 12. Dust ring cover. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0028] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] The first aspect of this application is Figure 1 and Figure 2 As shown, a split deflector is provided for the ball return function in a ball screw pair, comprising a mounting block 1, a limiting rib 2, and a ball return channel 3. The mounting block 1 serves as the main body of the deflector, assuming the functions of connection and support. The limiting ribs 2 are connected on both sides of the deflector to limit the position of the ball during the ball return process, ensuring that the ball can pass through the ball return channel 3 smoothly and accurately. The two ends of the ball return channel 3 are tangent to the ball groove of the screw, ensuring that the ball can smoothly enter the ball return channel from the ball groove and then return to the ball groove from the ball return channel during the circulation process.

[0030] According to traditional injection molding experience, demolding becomes significantly more difficult when the cross-section of the bead return channel exceeds 1 / 2 of a circle. This is because the shape of the bead return channel is more complex and there are large depressions inside, which makes the mold prone to sticking or blocking during demolding, resulting in the part being unable to be demolded smoothly or deforming its shape after demolding.

[0031] To overcome this problem, the present application has innovated the design of the deflector. Specifically, the mounting block 1 is divided into two halves along the axis of the bead return channel 3, namely, a first half-membrane 1a and a second half-membrane 1b. During the injection molding process, the first half-membrane 1a and the second half-membrane 1b can be injection molded separately. Since the shape of each half-membrane is relatively simple and there are no difficult-to-demold areas, they can be easily demolded from the mold. Then, the first half-membrane 1a and the second half-membrane 1b are combined together through a detachable connection to form a complete deflector.

[0032] This split design not only facilitates processing and manufacturing, but also greatly reduces the difficulty of demoulding. The split design also facilitates maintenance and replacement of the inverter. When the inverter fails or needs to be replaced, the first half of the mold 1a and the second half of the mold 1b can be easily separated for cleaning or replacement.

[0033] The ball return channel 3 is the path for the balls to circulate in the ball screw pair. In this embodiment, Figure 3 As shown, the cross-section of the ball return channel 3 is designed to be greater than or equal to 2 / 3 of an arc. Compared with the limitation that the ball return channel of the traditional reverser can only be less than 1 / 2 of a circle, it effectively avoids the problem of the ball falling, hitting or rubbing the screw when running in the raceway due to the channel being too small. The design of greater than or equal to 2 / 3 of an arc can better wrap the ball and ensure that the ball always remains in the channel during the ball return process, thereby improving the transmission efficiency and stability of the ball screw pair. At the same time, due to the adoption of a split design, even in the case where the ball return channel 3 is greater than or equal to 2 / 3 of an arc, there is no problem of demoulding difficulty, making this embodiment easier to implement.

[0034] The above detachable connection method can adopt bolt connection, snap connection, etc., making the installation and replacement of the reverser simpler and faster.

[0035] Specifically, to achieve a removable connection between the first and second half-frames 1a, 1b, this embodiment provides a chute 4 on the end face of the first half-frame 1a, near the second half-frame 1b. The chute 4 has a trapezoidal cross-section, with the long base of the trapezoid serving as the bottom of the chute 4. Accordingly, a connecting block 5 is provided on the end face of the second half-frame 1b, near the first half-frame 1a, to mate with the chute 4. When the first and second half-frames 1a, 1b, are joined, the connecting block 5 smoothly slides into the chute 4, achieving a tight fit and secure fixation thanks to its trapezoidal cross-section. This connection method is not only simple and reliable, but also facilitates disassembly and reassembly.

[0036] The second aspect of this application is Figure 4 and Figure 5 As shown, a ball screw pair is provided, which includes a screw rod 6, a nut 7, and a ball disposed in a ball groove of the screw rod 6. The working principle of the ball screw pair is to achieve relative motion between the screw rod and the nut by the rolling of the ball between the screw rod and the nut, thereby realizing the transmission function.

[0037] This embodiment integrates the above-mentioned deflector into the ball screw pair. Specifically, the deflector is fixedly mounted in the deflector mounting groove 8 of the nut 7, so that when the ball rolls between the screw and the nut, the deflector can smoothly and accurately realize the ball return function, thereby improving the transmission efficiency of the ball screw pair.

[0038] The third aspect of this application is as follows: Figure 4 and Figure 5As shown, a vehicle brake structure is provided, comprising a bearing outer ring 9, a retainer 10, and bearing steel balls 11. The bearing steel balls 11 are rollably mounted within the ball grooves of the retainer 10. The retainer 10 is fitted around the outside of the nut 7, which in turn fits around the outside of the bearing outer ring 9. The entire brake structure is connected to the vehicle body via the bearing outer ring 9. One end of the nut 7 is connected to a rotary drive device, while one end of the screw rod 6 is connected to the brake piston.

[0039] At the same time, in order to solve the problem that the traditional dust cover is easy to fall off, the dust ring cover is improved in this embodiment.

[0040] Specifically, a dust cover 12 is provided between the bearing outer ring 9 and the nut 7. The outer edge of the dust cover 12 is curled back to form an elastic portion. This allows the dust cover 12 to be squeezed and deformed during assembly to fill the inner retaining ring groove of the bearing outer ring 9, forming a hooked structure. This structure not only effectively prevents the dust cover from falling, but also improves dustproofing and extends the service life of the brake mechanism.

[0041] In summary, the reverser, ball screw pair and automobile brake structure provided by this application are significantly innovative in design. The split design of the reverser facilitates processing and manufacturing, greatly reduces the difficulty of demolding, and also facilitates the maintenance and replacement of the reverser. The ball return channel design of the reverser, which is greater than or equal to 2 / 3 of the arc, improves the transmission efficiency and stability of the ball screw pair; the integrated application of the reverser in the ball screw pair further improves its performance and precision; the optimized design of the reverser and dust ring cover in the automobile brake structure ensures the stability and reliability of the braking effect.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may 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 split type deflector for returning balls of a ball screw pair, the deflector comprising a mounting block (1) and limiting ribs (2) respectively connected to both sides of the mounting block (1); a ball return channel (3) is provided on one side of the mounting block (1); both ends of the ball return channel (3) are respectively tangent to the ball groove of the screw; It is characterized by: The mounting block (1) comprises a first half membrane (1a) and a second half membrane (1b) which are equally divided into two halves along the axis of the bead return channel (3); the first half membrane (1a) and the second half membrane (1b) are detachably connected.

2. A split type reverser according to claim 1, characterized in that: The cross section of the bead return channel (3) is greater than or equal to 2 / 3 of a circular arc.

3. A split type reverser according to claim 1, characterized in that: A sliding groove (4) is provided on the end surface of one side of the first half membrane (1a) close to the second half membrane (1b), the cross section of the sliding groove (4) is a trapezoid, and the long bottom side of the trapezoid is the bottom side of the sliding groove (4); A connecting block (5) that cooperates with the sliding groove (4) is provided on one end surface of the second half membrane (1b) close to the first half membrane (1a).

4. A ball screw pair, comprising a screw rod (6), a nut (7) and a ball disposed in a ball groove of the screw rod (6); characterized in that: It also includes the deflector according to any one of claims 1 to 3, wherein the deflector is fixed in the deflector mounting groove (8) of the nut (7).

5. An automobile braking structure, characterized in that: The invention comprises the ball screw pair as claimed in claim 4, and further comprises a bearing outer ring (9), a retaining frame (10) and a bearing steel ball (11); the bearing steel ball (11) is rollingly mounted in the ball groove of the retaining frame (10), the retaining frame (10) is sleeved on the outside of the nut (7), and the bearing outer ring (9) is sleeved on the outside of the retaining frame (10); the bearing outer ring (9) is used to connect to the vehicle body, one end of the nut (7) is used to connect to the rotary drive device, and one end of the screw (6) is used to connect to the brake piston.

6. The automobile brake structure according to claim 5, characterized in that: A dust ring cover (12) is provided between the bearing outer ring and the nut, a limiting ring groove is provided on the inner side of the bearing outer ring (9), and the outer peripheral edge of the dust ring cover (12) is reversely rolled back to form an elastic part, and the elastic part is in abutment with the limiting ring groove.

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