Rolling ball ramp structure, electric control brake and vehicle

Abstract

The utility model provides a rolling ball ramp structure, an electric control brake and a vehicle, and relates to the technical field of brakes, the rolling ball ramp structure comprises a driving side rotor, a driven side rotor and a plurality of rolling balls, the driving side rotor comprises a plurality of driving side ramp grooves; the driven side rotor comprises a plurality of driven side ramp grooves, and accommodating cavities are formed between the driven side ramp grooves and the corresponding driving side ramp grooves; the multiple rolling balls are arranged in the containing cavities correspondingly, the rolling balls abut against the inner walls of the two sides of the driving side ramp groove correspondingly and / or the rolling balls abut against the inner walls of the two sides of the driven side ramp groove correspondingly, and the rolling balls can move along the driven side ramp groove under relative rotation driving of the driving side rotor and the driven side rotor. And then the driving side rotor and the driven side rotor are driven to relatively move along the axial direction. Two-point contact is formed between the rolling ball and the inner walls of the two sides of the ramp groove, so that the Hertz contact stress can be reduced, and the service life of the rolling ball is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of brakes, in particular to a ball ramp structure, an electric brake and a vehicle. Background Art

[0002] With the wide use of vehicle equipment, the number of brakes used on vehicles has also increased rapidly. The brakes on existing vehicles generally use electric motors to drive, and the electric motors drive friction members to press against brake discs through transmission structures, so as to realize braking operations. In the prior art, the transmission structure needs to convert the rotational motion of the rotor shaft of the electric motor into an axial motion for moving the friction member axially, so as to control the contact between the friction member and the braking element.

[0003] For example, when the transmission structure is a ball ramp mechanism, the ball ramp mechanism includes a driving-side turntable, a driven-side turntable and balls arranged between the two. The driving-side turntable and the driven-side turntable are relatively arranged coaxially. Ramp grooves are respectively arranged on the end faces of the driving-side turntable and the driven-side turntable that face each other. The depth of the ramp grooves is gradually increased from one end to the other end, and the two ramp grooves are arranged in opposite directions. When the driving-side turntable rotates driven by an electric motor, the relative rotation of the driving-side turntable and the driven-side turntable is used to move the balls along the ramp grooves, so that the driven-side turntable moves axially.

[0004] However, the cross section of the existing ramp grooves is generally U-shaped, and the radian of the ramp grooves is generally larger than that of the balls, resulting in only one contact point between the ramp grooves and the balls. Under high clamping force, the contact stress of the ramp grooves on the balls is likely to exceed the bearing capacity of the balls, thus causing the balls to be damaged. Moreover, the depth of the existing ramp grooves gradually changes from one end to the other end, so that the driving-side turntable can only move along a preset rotation direction, and the movement stroke of the balls in the ramp grooves is long, resulting in a long braking time. Summary of the Utility Model

[0005] In order to overcome the above defects of the prior art, the technical problem to be solved by the embodiments of the utility model is to provide a ball ramp structure, an electric brake and a vehicle.

[0006] The above object of the utility model can be achieved by the following technical solutions. The utility model provides a ball ramp structure, including:

[0007] A driving-side rotor, the driving-side rotor includes a driving-side end face, and a plurality of driving-side ramp grooves arranged at intervals around the driving-side end face;

[0008] The driven-side rotor is coaxially arranged with the driving-side rotor. The driven-side rotor includes a driven-side end face opposite to the driving-side end face, and a plurality of driven-side ramp grooves annularly arranged at intervals on the driven-side end face. The driven-side ramp grooves are arranged corresponding to the driving-side ramp grooves. Along a preset rotation direction, the depth change trend of the driven-side ramp grooves is the same as that of the driving-side ramp grooves. An accommodation cavity is formed between the driven-side ramp grooves and the corresponding driving-side ramp grooves.

[0009] A plurality of rolling balls are respectively arranged in each of the accommodation cavities. The rolling balls respectively abut against the inner walls on both sides of the driving-side ramp grooves and / or the rolling balls respectively abut against the inner walls on both sides of the driven-side ramp grooves. The rolling balls can move along the driven-side ramp grooves under the relative rotation drive of the driving-side rotor and the driven-side rotor, and further drive the driving-side rotor and the driven-side rotor to move relatively axially.

[0010] In a preferred embodiment of the present utility model, along the preset rotation direction, the depth change amount of the driving-side ramp grooves is the same as that of the driven-side ramp grooves.

[0011] In a preferred embodiment of the present utility model, the inner wall of the driving-side ramp groove includes a first outer curved surface and a first inner curved surface that are connected. The connection between the first outer curved surface and the first inner curved surface forms the bottom of the driving-side ramp groove. The bottom of the driving-side ramp groove is spaced from the rolling balls. Both the first outer curved surface and the first inner curved surface can abut against the rolling balls.

[0012] In a preferred embodiment of the present utility model, the position where the first outer curved surface abuts against the rolling ball forms a first outer abutting line, and the curvature of the first outer abutting line at the position where it abuts against the rolling ball is not less than the curvature of the rolling ball; and / or, the position where the first inner curved surface abuts against the rolling ball forms a first inner abutting line, and the curvature of the first inner abutting line at the position where it abuts against the rolling ball is not less than the curvature of the rolling ball.

[0013] In a preferred embodiment of the present utility model, the inner wall of the driven-side ramp groove includes a second outer curved surface and a second inner curved surface that are oppositely arranged. The connection between the second outer curved surface and the second inner curved surface forms the bottom of the driven-side ramp groove. The bottom of the driven-side ramp groove is spaced from the rolling balls. Both the second outer curved surface and the second inner curved surface can abut against the rolling balls.

[0014] In a preferred embodiment of the present utility model, the position where the second outer curved surface abuts against the rolling ball forms a second outer abutting line, and the curvature of the second outer abutting line at the position where it abuts against the rolling ball is not less than the curvature of the rolling ball; and / or, the position where the second inner curved surface abuts against the rolling ball forms a second inner abutting line, and the curvature of the second inner abutting line at the position where it abuts against the rolling ball is not less than the curvature of the rolling ball.

[0015] In a preferred embodiment of the present utility model, the driving-side rotor includes a driving-side turntable, and a plurality of the driving-side ramp grooves are arranged at equal intervals in a circumferential direction around the axis of the driving-side rotor. The driven-side rotor includes a driven-side turntable, and a plurality of the driven-side ramp grooves are arranged at equal intervals in a circumferential direction around the axis of the driven-side turntable.

[0016] In a preferred embodiment of the present utility model, driving teeth are arranged in a circumferential direction on the outer wall of the driving-side turntable.

[0017] The present utility model further provides an electric brake, which includes the aforementioned rolling ball ramp structure.

[0018] The present utility model further provides a vehicle, which includes the aforementioned electric brake.

[0019] The technical solution of the present utility model has the following remarkable beneficial effects:

[0020] When the rolling ball ramp structure of the present utility model is in use, the driving-side rotor and the driven-side rotor are coaxially arranged, and the driving-side end surface of the driving-side rotor is arranged opposite to the driven-side end surface of the driven-side rotor, so that an accommodating cavity can be formed between the driving-side ramp groove and the corresponding driven-side ramp groove. The rolling ball is arranged in the accommodating cavity, and the rolling ball can move along the ramp groove under the relative rotation drive of the driving-side rotor and the driven-side rotor, thereby driving the driving-side rotor and the driven-side rotor to move relatively along the axial direction. Moreover, the depth change trend of the driven-side ramp groove in the present utility model is the same as that of the driving-side ramp groove, so that the driving-side ramp groove and the driven-side ramp groove can be better matched, and it also helps to reduce the processing difficulty of the driving-side ramp groove and the driven-side ramp groove.

[0021] Moreover, the rolling balls in the present utility model can respectively abut against the two inner walls of the ramp groove on the driving side and / or the rolling balls can respectively abut against the two inner walls of the ramp groove on the driven side, so that the rolling balls can form two-point contact with the two inner walls of the ramp groove, and the force is transmitted through the multi-point contact method, thereby reducing the Hertz contact stress and contributing to improving the service life of the rolling balls. In addition, by having two contact points between the rolling balls and the ramp groove, it also helps to disperse the clamping force, improve the load-bearing capacity of the ramp groove, and facilitate the flexible adjustment of the contact angle between the ramp groove and the rolling balls. Furthermore, by adjusting the contact angle to generate the required radial component force for radial support, the ramp groove has better radial support ability, and thus there is no need to set additional radial support parts to support the driving-side rotor, simplifying the structure and helping to reduce the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] The drawings described herein are only for illustrative purposes and are not intended to limit the scope of the disclosure of the present utility model in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present utility model, rather than specifically limiting the shapes and proportional dimensions of the components of the present utility model. Those skilled in the art can, under the teaching of the present utility model, select various possible shapes and proportional dimensions according to specific circumstances to implement the present utility model.

[0024] Figure 1 Structural schematic diagram of an embodiment of the rolling ball ramp structure of the present utility model;

[0025] Figure 2 Cross-sectional view of an embodiment of the rolling ball ramp structure of the present utility model;

[0026] Figure 3 Stereoscopic structural schematic diagram of an embodiment of the driving-side rotor of the present utility model;

[0027] Figure 4 Stereoscopic structural schematic diagram of an embodiment of the driven-side rotor of the present utility model;

[0028] Figure 5 Schematic diagram of the position of the rolling balls in the starting state of the present utility model.

[0029] Figure 6 Schematic diagram of the position of the rolling balls during the braking process of the present utility model.

[0030] Figure 7 This is a schematic diagram of the position of the rolling ball in the parking state in the present utility model.

[0031] Figure 8 This is a schematic diagram of the structure of the preset guiding track in the present utility model.

[0032] The reference numerals of the above drawings:

[0033] 101. First guiding line;

[0034] 102. Second guiding line;

[0035] 110. Front limiting section; 120. Front arc section; 130. Uphill section; 131. Front uphill section; 132. Rear uphill section; 140. Downhill section; 150. Rear arc section; 160. Rear limiting section;

[0036] 200. Rolling ball;

[0037] 310. Driving side ramp groove; 311. First outer surface; 312. First inner surface;

[0038] 320. Driven side ramp groove; 321. Second outer surface; 322. Second inner surface;

[0039] 400. Driving side rotor; 410. Threaded through hole; 420. Driving tooth;

[0040] 500. Driven side rotor; 510. Mounting through hole. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0042] Embodiment 1

[0043] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown in the figure, in an embodiment of the present utility model, a rolling ball ramp structure is provided. The rolling ball ramp structure includes a driving side rotor 400, a driven side rotor 500, and a plurality of rolling balls 200. The driving side rotor 400 includes a driving side end face and a plurality of driving side ramp grooves 310 that are spaced apart and annularly arranged on the driving side end face; the driven side rotor 500 is coaxially arranged with the driving side rotor 400. The driven side rotor 500 includes a driven side end face opposite to the driving side end face and a plurality of driven side ramp grooves 320 that are spaced apart and annularly arranged on the driven side end face. The driven side ramp grooves 320 are correspondingly arranged with the driving side ramp grooves 310. Along a preset rotation direction, the depth change trend of the driven side ramp grooves 320 is the same as that of the driving side ramp grooves 310. A receiving cavity is formed between the driven side ramp grooves 320 and the corresponding driving side ramp grooves 310; the plurality of rolling balls 200 are respectively arranged in each receiving cavity. The rolling balls 200 respectively abut against the inner walls on both sides of the driving side ramp grooves 310 and / or the rolling balls 200 respectively abut against the inner walls on both sides of the driven side ramp grooves 320. The rolling balls 200 can move along the driven side ramp grooves 320 under the relative rotation drive of the driving side rotor 400 and the driven side rotor 500, and further drive the driving side rotor 400 and the driven side rotor 500 to move relatively along the axial direction.

[0044] Overall, when the rolling ball ramp structure of the present utility model is in use, the driving side rotor 400 and the driven side rotor 500 are coaxially arranged, and the driving side end face of the driving side rotor 400 is opposite to the driven side end face of the driven side rotor 500, so that a receiving cavity can be formed between the driving side ramp grooves 310 and the corresponding driven side ramp grooves 320. The rolling balls 200 are arranged in the receiving cavity. The rolling balls 200 can move along the driven side ramp grooves 320 under the relative rotation drive of the driving side rotor 400 and the driven side rotor 500, and further drive the driving side rotor 400 and the driven side rotor 500 to move relatively along the axial direction.

[0045] In the present utility model, the depth change trend of the driving side ramp grooves 310 is the same as that of the driven side ramp grooves 320, so that the driving side ramp grooves 310 and the driven side ramp grooves 320 can be better matched, and it also helps to reduce the processing difficulty of the driving side ramp grooves 310 and the driven side ramp grooves 320.

[0046] In the present utility model, the rolling balls 200 can respectively abut against the inner walls on both sides of the driving side ramp grooves 310 and / or the rolling balls 200 can respectively abut against the inner walls on both sides of the driven side ramp grooves 320, so that the rolling balls 200 can form two-point contact with the inner walls on both sides of the ramp grooves, and the force is transmitted in a multi-point contact manner, thereby reducing the Hertz contact stress and helping to improve the service life of the rolling balls 200.

[0047] Moreover, by having two contact points between the rolling ball 200 and the ramp groove, it also helps to disperse the clamping force, improves the load-bearing capacity of the ramp groove, and facilitates the flexible adjustment of the contact angle between the ramp groove and the rolling ball 200. Furthermore, by adjusting the contact angle, the required radial component force can be generated for radial support use, enabling the ramp groove to have better radial support capacity. As a result, there is no need to set up additional radial support parts to support the driving-side rotor 400, simplifying the structure and thus helping to reduce the manufacturing cost.

[0048] In an embodiment of the present invention, the driving-side rotor 400 and the driven-side rotor 500 rotate relative to each other circumferentially and move relative to each other axially, including but not limited to the following three cases: First, the driving-side rotor 400 is fixed, and the driven-side rotor 500 rotates circumferentially while moving axially; Second, the driving-side rotor 400 is fixed axially and can only rotate circumferentially, while the driven-side rotor 500 is fixed circumferentially and can only move axially; Third, both the driving-side rotor 400 and the driven-side rotor 500 can rotate circumferentially and in opposite directions, and at the same time, one or both of them move axially.

[0049] Of course, the driving-side rotor 400 and the driven-side rotor 500 can be mutually converted, that is, the driven-side rotor 500 can be used as the driving side, and the driving-side rotor 400 can be used as the driven side, without specific limitations here.

[0050] In an embodiment of the present invention, the designer can adjust the depth change amount of the driving-side ramp groove 310 and the depth change amount of the driven-side ramp groove 320 according to the usage requirements, without specific limitations here. Preferably, along the preset rotation direction, the depth change amount of the driving-side ramp groove 310 is the same as the depth change amount of the driven-side ramp groove 320.

[0051] In an embodiment of the present invention, the inner wall of the driving-side ramp groove 310 includes a first outer curved surface 311 and a first inner curved surface 312 that are connected. The connection between the first outer curved surface 311 and the first inner curved surface 312 forms the bottom of the driving-side ramp groove 310. The bottom of the driving-side ramp groove 310 is spaced from the rolling ball 200, and both the first outer curved surface 311 and the first inner curved surface 312 can be in contact with the rolling ball 200.

[0052] By using the first outer curved surface 311 and the first inner curved surface 312 to form the inner wall of the driving-side ramp groove 310, the first outer curved surface 311 and the first inner curved surface 312 have a certain curvature, enabling both the first outer curved surface 311 and the first inner curved surface 312 to be in contact with the rolling ball 200. As a result, two-point contact is formed between the rolling ball 200 and the driving-side ramp groove 310, and further, the Hertz contact stress exerted by the driving-side ramp groove 310 on the rolling ball 200 can be reduced, which helps to improve the service life of the rolling ball 200.

[0053] Moreover, the first outer surface 311 and the first inner surface 312 can also clamp the rolling ball 200 to prevent the rolling ball 200 from moving erratically, thereby improving the motion stability of the rolling ball 200. Designers can adjust the curvature of the first outer surface 311 and the first inner surface 312 according to the usage requirements, and no specific limitation is made here.

[0054] In the embodiment of the present utility model, along the preset rotation direction, the circumferential curvature of the first outer surface 311 is the same as the circumferential curvature of the first inner surface 312. By making the circumferential curvature of the first outer surface 311 the same as the circumferential curvature of the first inner surface 312, the width of the driving-side ramp groove 310 can be made the same, and thus the rolling ball 200 can be clamped more stably, and balanced stress can be applied to both sides of the rolling ball 200, which is beneficial to improving the service life of the rolling ball 200.

[0055] Of course, in other feasible embodiments, designers can adjust the circumferential curvature of the first outer surface 311 and the circumferential curvature of the first inner surface 312 according to the usage requirements, and no specific limitation is made here. For example, along the preset rotation direction, the circumferential curvature of the first outer surface 311 may not be the same as the circumferential curvature of the first inner surface 312.

[0056] In the embodiment of the present utility model, the position where the first outer surface 311 abuts against the rolling ball 200 forms a first outer abutting line, and the curvature of the first outer abutting line at the position where it abuts against the rolling ball 200 is not less than the curvature of the rolling ball 200; and / or, the position where the first inner surface 312 abuts against the rolling ball 200 forms a first inner abutting line, and the curvature of the first inner abutting line at the position where it abuts against the rolling ball 200 is not less than the curvature of the rolling ball 200.

[0057] Preferably, the position where the first outer surface 311 abuts against the rolling ball 200 forms a first outer abutting line, and the curvature of the first outer abutting line at the position where it abuts against the rolling ball 200 is greater than the curvature of the rolling ball 200; and, the position where the first inner surface 312 abuts against the rolling ball 200 forms a first inner abutting line, and the curvature of the first inner abutting line at the position where it abuts against the rolling ball 200 is greater than the curvature of the rolling ball 200.

[0058] By making the curvature of the contact portion between the first outer abutting line and the rolling ball 200 greater than the curvature of the rolling ball 200, the first outer curved surface 311 can abut against the rolling ball 200 more smoothly, reducing the problem of increased stress on the rolling ball 200 due to curvature changes. Moreover, by making the curvature of the contact portion between the first inner abutting line and the rolling ball 200 greater than the curvature of the rolling ball 200, the first inner curved surface 312 can abut against the rolling ball 200 more smoothly, reducing the problem of increased Hertz contact stress on the rolling ball 200 due to different curvatures, thereby improving the service life of the rolling ball 200 and facilitating the placement of the rolling ball 200 between the first outer curved surface 311 and the first inner curved surface 312.

[0059] More preferably, in the thickness direction of the driving-side rotor 400, the contact portion between the first outer abutting line and the rolling ball 200 and the contact portion between the first inner abutting line and the rolling ball 200 are located or approximately located at the same height, such that the shapes of the first outer abutting line and the first inner abutting line are the same, so that both sides of the rolling ball 200 can symmetrically abut against the first outer curved surface 311 and the first inner curved surface 312, improving the movement stability of the rolling ball 200 and helping to reduce the Hertz contact stress.

[0060] In an embodiment of the present utility model, the inner wall of the driven-side ramp groove 320 includes a relatively arranged second outer curved surface 321 and a second inner curved surface 322. The joint between the second outer curved surface 321 and the second inner curved surface 322 forms the bottom of the driven-side ramp groove 320. The bottom of the driven-side ramp groove 320 is spaced from the rolling ball 200, and both the second outer curved surface 321 and the second inner curved surface 322 can abut against the rolling ball 200.

[0061] By using the second outer curved surface 321 and the second inner curved surface 322 to form the inner wall of the driven-side ramp groove 320, the second outer curved surface 321 and the second inner curved surface 322 have a certain curvature, such that both the second outer curved surface 321 and the second inner curved surface 322 can abut against the rolling ball 200, thereby forming two-point contact between the rolling ball 200 and the driven-side ramp groove 320, and thus reducing the Hertz contact stress exerted by the driven-side ramp groove 320 on the rolling ball 200, which helps to improve the service life of the rolling ball 200.

[0062] Moreover, the second outer curved surface 321 and the second inner curved surface 322 can also clamp the rolling ball 200, preventing the rolling ball 200 from moving erratically, thereby improving the movement stability of the rolling ball 200. Designers can adjust the curvature sizes of the second outer curved surface 321 and the second inner curved surface 322 according to usage requirements, which are not specifically limited herein.

[0063] In an embodiment of the present utility model, along a preset rotation direction, the circumferential curvature of the second outer surface 321 is the same as that of the second inner surface 322. By making the circumferential curvature of the second outer surface 321 the same as that of the second inner surface 322, the width of the driving-side ramp groove 310 can be made the same, and thus the rolling ball 200 can be better clamped, and balanced stress can be applied to both sides of the rolling ball 200, which is beneficial to improving the service life of the rolling ball 200.

[0064] Of course, in other feasible embodiments, designers can adjust according to the usage requirements. The circumferential curvature of the second outer surface 321 and the circumferential curvature of the second inner surface 322 are not specifically limited herein. For example, along the preset rotation direction, the circumferential curvature of the second outer surface 321 may not be the same as that of the second inner surface 322.

[0065] In an embodiment of the present utility model, the circumferential curvature of the second outer surface 321 and the second inner surface 322 is the same as or substantially the same as the circumferential curvature of the first outer surface 311 and the first inner surface 312, so that four-point contact can be formed between the first outer surface 311, the first inner surface 312, the second outer surface 321 and the second inner surface 322 and the rolling ball 200, significantly improving the movement stability of the rolling ball 200.

[0066] Moreover, through the multi-point contact method, the Hertz contact stress is dispersed, so that the rolling ball 200 can move along the ramp groove under the relative rotational drive of the driving-side rotor 400 and the driven-side rotor 500, and then drive the driving-side rotor 400 and the driven-side rotor 500 to move axially relative to each other.

[0067] Furthermore, by controlling the directions of the contact points between the first outer surface 311, the first inner surface 312, the second outer surface 321 and the second inner surface 322 and the rolling ball 200, the contact angles between the first outer surface 311, the first inner surface 312, the second outer surface 321 and the second inner surface 322 and the rolling ball 200 can be controlled. Furthermore, by adjusting the directions of the contact angles, the radial component forces of each curved surface on the rolling ball 200 can also be adjusted according to the set target, so that the radial disturbance at low resistance can be better coped with.

[0068] Specifically, the supporting force of the first outer surface 311 on the rolling ball 200 is F1, the radial component force of F1 is F1a, and the axial component force is F1b. The angle between F1 and F1a constitutes the contact angle α between the first outer surface 311 and the rolling ball 200. Among them, the radial direction is the radial direction of the driving-side rotor or the driven-side rotor, and the axial direction is the thickness direction of the driving-side rotor or the driven-side rotor.

[0069] Similarly, the contact angles between the first inner surface 312 and the rolling ball 200, between the second outer surface 321 and the rolling ball 200, and between the second inner surface 322 and the rolling ball 200 can be obtained.

[0070] Preferably, F1 and F4 are in opposite directions, and F2 and F3 are in opposite directions. More preferably, F1, F2, F3, and F4 are in the same plane.

[0071] Of course, in other feasible embodiments, the designer can adjust the specific directions of the contact angles according to the usage requirements, and no specific limitations are made here.

[0072] In the embodiment of the present utility model, the position where the second outer surface 321 abuts against the rolling ball 200 forms a second outer abutting line, and the curvature at the abutting position of the second outer abutting line and the rolling ball 200 is not less than the curvature of the rolling ball 200; and / or, the position where the second inner surface 322 abuts against the rolling ball 200 forms a second inner abutting line, and the curvature at the abutting position of the second inner abutting line and the rolling ball 200 is not less than the curvature of the rolling ball 200.

[0073] Preferably, the position where the second outer surface 321 abuts against the rolling ball 200 forms a second outer abutting line, and the curvature at the abutting position of the second outer abutting line and the rolling ball 200 is greater than the curvature of the rolling ball 200; and, the position where the second inner surface 322 abuts against the rolling ball 200 forms a second inner abutting line, and the curvature at the abutting position of the second inner abutting line and the rolling ball 200 is greater than the curvature of the rolling ball 200.

[0074] By making the curvature at the abutting position of the second outer abutting line and the rolling ball 200 greater than the curvature of the rolling ball 200, the second outer surface 321 can abut against the rolling ball 200 more smoothly, reducing the problem of the increase in Hertz contact stress on the rolling ball 200 caused by the curvature change. And, by making the curvature at the abutting position of the second inner abutting line and the rolling ball 200 greater than the curvature of the rolling ball 200, the second inner surface 322 can abut against the rolling ball 200 more smoothly, reducing the problem of the increase in Hertz contact stress on the rolling ball 200 caused by different curvatures, thereby improving the service life of the rolling ball 200 and also facilitating the placement of the rolling ball 200 between the second outer surface 321 and the second inner surface 322.

[0075] More preferably, in the thickness direction of the driven-side rotor 500, the abutting position of the second outer abutting line and the rolling ball 200 and the abutting position of the second inner abutting line and the rolling ball 200 are located or approximately located at the same height, so that the shapes of the second outer abutting line and the second inner abutting line are the same, and thus both sides of the rolling ball 200 can symmetrically abut against the second outer surface 321 and the second inner surface 322, improving the motion stability of the rolling ball 200.

[0076] In an embodiment of the present utility model, the driving-side rotor 400 includes a driving-side turntable. A plurality of driving-side ramp grooves 310 are arranged at equal intervals in a ring around the axis of the driving-side rotor 400. The driven-side rotor 500 includes a driven-side turntable. A plurality of driven-side ramp grooves 320 are arranged at equal intervals in a ring around the axis of the driven-side rotor 500.

[0077] Furthermore, a threaded through-hole 410 is provided in the middle of the driving-side turntable. The axis of the threaded through-hole 410 is the axis of the driving-side rotor 400. An installation through-hole 510 is provided in the middle of the driven-side turntable. The axis of the installation through-hole 510 is the axis of the driven-side rotor 500.

[0078] By arranging the threaded through-hole 410 in the middle of the driving-side turntable and arranging the installation through-hole 510 in the middle of the driven-side turntable, the driving-side turntable and the driven-side turntable can be coaxially installed by using the threaded through-hole 410 and the installation through-hole 510. Designers can adjust the specific installation method of the driving-side turntable and the driven-side turntable according to the use requirements, and no specific limitation is made here.

[0079] For example, the driven-side turntable is arranged at one end of the thrust mechanism of the electric brake. A caliper is connected to the other end of the thrust mechanism. The driving-side turntable is arranged on the rotary driving mechanism of the electric brake. The rotary motion of the rotary driving mechanism can be converted into the linear motion of the thrust mechanism through the ball ramp structure.

[0080] In an embodiment of the present utility model, driving teeth 420 are arranged in a ring on the outer wall of the driving-side turntable. As can be seen from the above, the driving-side turntable is arranged on the rotary driving mechanism of the electric brake.

[0081] Specifically, the rotary driving mechanism includes a rotary motor, a reduction gear, and a driving-side turntable. The driving-side turntable has driving teeth 420 meshing with the reduction gear. The rotary motion of the rotary motor is transmitted to the driving-side turntable after being decelerated by the reduction gear. A driven-side turntable is arranged at one end of the thrust mechanism close to the rotary driving mechanism. The driven-side turntable and the driving-side turntable are arranged opposite to each other in the moving direction. A plurality of driving-side ramp grooves 310 are provided on the end face of the driving-side turntable facing the driven-side turntable. A plurality of corresponding driven-side ramp grooves 320 are provided on the end face of the driven-side turntable facing the driving-side turntable, so as to cooperate to form a plurality of accommodating cavities. The more specific structure of the electric brake is the same as that of the prior art and will not be elaborated here.

[0082] In an embodiment of the present utility model, designers can adjust the specific number of the accommodating cavities according to the use requirements, and no specific limitation is made here. Preferably, the number of the accommodating cavities is preferably more than three. For example, in this embodiment, the number of the accommodating cavities is three.

[0083] As can be seen from the above, in the preferred embodiment, the first outer abutting wire and the first inner abutting wire in the present utility model have the same shape, and the second outer abutting wire and the second inner abutting wire have the same shape. Further, the first outer abutting wire or the first inner abutting wire forms the first guiding wire 101, so that the rolling ball 200 can move on the driving-side rotor 400 along the first guiding wire 101; similarly, the second outer abutting wire or the second inner abutting wire forms the second guiding wire 102, so that the rolling ball 200 can move on the driven-side rotor 500 along the second guiding wire 102.

[0084] More preferably, the first outer abutting wire and the second outer abutting wire have the same shape, and the first inner abutting wire and the second inner abutting wire have the same shape, so that the first guiding wire 101 and the second guiding wire 102 have the same shape.

[0085] Specifically, the first guiding wire 101 is located on the first outer curved surface 311 and / or the first inner spherical surface, and the second guiding wire 102 is located on the second outer curved surface 321 and / or the second inner spherical surface.

[0086] As Figures 1 to 4 shown, in the embodiment of the present utility model, the driving-side rotor 400 is rotatably arranged in the circumferential direction, and its rotation direction is defined as X; the driven-side rotor 500 is axially movable, and its movement direction is defined as Y. The rotational movement of the driving-side rotor 400 in the rotation direction X is converted into a linear movement of the driven-side rotor 500 in the movement direction Y through the rolling ball ramp structure. Among them, the rotation direction X includes the opposite precession direction X1 and the retraction direction X2; the movement direction Y includes the opposite forward direction Y1 and the backward direction Y2.

[0087] Specifically, as Figures 5 to 7 shown, the driving-side ramp groove 310 has a first guiding wire 101 arranged along the preset track of the rolling ball 200, and the driven-side ramp groove 320 has a second guiding wire 102 arranged along the preset track of the rolling ball 200. The track formed during the rolling of the rolling ball 200 is limited by the shapes of the first guiding wire 101 and the second guiding wire 102. Among them, the first guiding wire 101 and the second guiding wire 102 have the same shape, but are arranged in opposite directions in the rotation direction X. As in the above embodiment, the first guiding wire 101 on the driving-side ball plate extends from its starting point to its ending point along the precession direction X1, and the second guiding wire 102 on the driven-side ball plate extends from its starting point to its ending point along the retraction direction X2.

[0088] Therefore, as Figures 5 to 7As shown, the utility model defines the shapes of the first guiding line 101 and the second guiding line 102, thereby defining the trajectory along which the rolling ball 200 can roll between the driving-side ramp groove 310 and the driven-side ramp groove 320. The first guiding line 101 and the second guiding line 102 here are only used to indicate the movement trajectory of the rolling ball 200 to better reflect the shape and structure of the driving-side ramp groove 310 and the driven-side ramp groove 320, and the first guiding line 101 and the second guiding line 102 are not solid lines.

[0089] When the driving-side rotor 400 rotates relative to the driven-side rotor 500 in the precession direction X1, the rolling ball 200 rolls from the starting point to the ending point within the driving-side ramp groove 310 and the driven-side ramp groove 320, thereby driving the driven-side rotor 500 to move in the forward direction Y1.

[0090] When the driven-side rotor 500 moves in the backward direction Y2, the rolling ball 200 rolls from the ending point to the starting point within the driving-side ramp groove 310 and the driven-side ramp groove 320, thereby driving the driving-side rotor 400 to rotate relative to the driven-side rotor 500 in the retrocession direction X2.

[0091] In the embodiment of the utility model, along the direction from the driving-side rotor 400 to the driven-side rotor 500, the first guiding line 101 includes a spirally ascending uphill section 130, a spirally descending downhill section 140, a front limiting section 110 connected to the starting point of the uphill section 130, a front arc section 120 located between the front limiting section 110 and the uphill section 130, a rear limiting section 160 connected to the ending point of the downhill section 140, and a rear arc section 150 located between the rear limiting section 160 and the downhill section 140.

[0092] Specifically, the uphill section 130 spirally ascends relative to the opposite turntable from its starting point to its ending point, that is, it extends circumferentially while being inclined in the direction of approaching the opposite turntable. The downhill section 140 spirally descends relative to the opposite turntable from its starting point to its ending point, that is, it extends circumferentially while being inclined in the direction of moving away from the opposite turntable. The ending point of the uphill section 130 is connected to the starting point of the downhill section 140.

[0093] In the rolling ball ramp structure of the utility model, by defining that the first guiding line 101 has a spirally ascending uphill section 130 and a spirally descending downhill section 140, when the rolling ball 200 rolls from the starting point of the uphill section 130 to the ending point of the uphill section 130, it can push the two turntables to move away from each other axially. Furthermore, the rolling ball 200 can continue to roll from the ending point of the uphill section 130 to the downhill section 140, thereby achieving self-locking by using the resistance of the downhill section 140 and preventing the rolling ball 200 from retreating to the uphill section 130 and causing the two turntables to move closer to each other axially.

[0094] Further, the uphill section 130 includes a front uphill section 131 and a rear uphill section 132. The end of the front uphill section 131 is connected to the start of the rear uphill section 132, and the end of the rear uphill section 132 is connected to the start of the downhill section 140. The slope of the front uphill section 131 is greater than that of the rear uphill section 132, that is, the gradient of the front uphill section 131 is greater than that of the rear uphill section 132. By setting the front uphill section 131 with a larger gradient and the rear uphill section 132 with a smaller gradient, the front uphill section 131 is used to improve the braking response speed, while the rear uphill section 132 requires a relatively smaller rotational torque provided by the rotational drive mechanism, which is beneficial to optimizing the performance requirements of the rotational drive mechanism.

[0095] Of course, in other feasible embodiments, the designer can adjust the specific shape and structure of the driving-side ramp groove 310 according to the usage requirements, and no specific limitation is made here. Among them, the specific shape and structure of the driven-side ramp groove 320 can refer to the specific shape and structure of the driving-side ramp groove 310, and will not be elaborated here.

[0096] Since the rolling ball 200 will cause the thrust mechanism to retreat a certain distance along the backward direction Y2 when rolling along the downhill section 140, in order to avoid the excessive retreat distance of the thrust mechanism, resulting in a reduction in braking force and the inability to maintain the effectiveness of the braking state, in the implementation manner of the present utility model, the height of the spiral descent of the downhill section 140 is less than the height of the spiral ascent of the uphill section 130. Among them, the height of the spiral ascent of the uphill section 130 is equal to the distance that the thrust mechanism moves along the forward direction Y1, and the height of the spiral descent of the downhill section 140 is equal to the distance that the thrust mechanism moves along the backward direction Y2. Therefore, the distance that the rolling ball 200 drives the thrust mechanism to move along the forward direction Y1 when rolling along the uphill section 130 is greater than the distance that the thrust mechanism can move along the backward direction Y2 when the rolling ball 200 rolls along the downhill section 140. After the rolling ball 200 rolls to the end of the downhill section 140 along the downhill section 140, the thrust mechanism can still provide a large thrust, so that there is a large braking force between the caliper and the brake disc, thereby maintaining an effective braking state.

[0097] Among them, the height of the spiral descent of the downhill section 140 and the height of the spiral ascent of the uphill section 130 can be set according to the braking requirements without specific limitation. In some specific embodiments of the present utility model, for example, the height of the spiral ascent of the uphill section 130 should be greater than the deformation amount required for the caliper to generate the maximum clamping force, so as to ensure that the rolling ball 200 can push the thrust mechanism under the guidance of the uphill section 130 to make the caliper generate the required maximum clamping force. The height of the spiral descent of the downhill section 140 is preferably less than 10% of the height of the spiral ascent of the uphill section 130.

[0098] Further, in combination with Figure 7 and Figure 8As shown, in order to avoid excessive resistance in the downhill section 140, making it difficult for the piston to push the rolling ball 200 to roll along the retracting direction X2 through the downhill section 140 and release the braking state when pressing the thrust mechanism along the backward direction Y2, in the embodiments of the present utility model, the slope of the downhill section 140 is smaller than that of the uphill section 130, that is, the inclination angle of the downhill section 140 is smaller than that of the uphill section 130. Among them, the slopes of the downhill section 140 and the uphill section 130 can be set according to the braking requirements without specific limitations. In some specific embodiments of the present utility model, the inclination angle of the uphill section 130 is greater than the equivalent friction angle, preferably 2° to 10°; the inclination angle of the downhill section 140 is preferably 0.6° to 1°.

[0099] In addition, as Figure 8 shown, in order to improve the continuity between the uphill section 130 and the downhill section 140, in the embodiments of the present utility model, the end point of the uphill section 130 is smoothly transitionally connected to the starting point of the downhill section 140.

[0100] As Figure 8 shown, in order to prevent the rolling ball 200 from rolling over the end point of the downhill section 140 and rolling out of the driving side ramp groove 310, in the embodiments of the present utility model, the first guiding line 101 further includes a rear limiting section 160 connected to the end point of the downhill section 140. The rear limiting section 160 spirally rises from its starting point to the end point relative to the opposite turntable, and the slope of the rear limiting section 160 is greater than that of the uphill section 130, so that the rolling ball 200 must roll over the end point of the rear limiting section 160 to roll out of the driving side ramp groove 310. Since the rotational torque required for the rolling ball 200 to roll along the rear limiting section 160 is greater than the rotational torque required for the rolling ball 200 to roll along the uphill section 130, a soft limit rather than a hard impact is achieved by using the rear limiting section 160. On the one hand, it can prevent the rolling ball 200 from rolling over the rear limiting section 160 and rolling out of the driving side ramp groove 310, and on the other hand, it can prevent the rolling ball 200 from directly impacting the inner wall surface end point of the ramp groove and generating noise.

[0101] In addition, as Figure 8 shown, in order to enable the rolling ball 200 to stay stably at the end point of the downhill section 140 and maintain a stable braking state, in the embodiments of the present utility model, the end point of the downhill section 140 is connected to the rear limiting section 160 through a rear arc section 150. Specifically, the rear limiting section 160 is arranged to extend along the tangent direction at the end point of the rear arc section 150, so as to ensure the continuity between the rear arc section 150 and the rear limiting section 160, and prevent the rolling ball 200 from generating noise during the process of rolling from the rear arc section 150 to the rear limiting section 160. Preferably, the radius of the rear arc section 150 is equal to the radius of the rolling ball 200.

[0102] As Figure 8As shown, in order to prevent the rolling ball 200 from rolling over the starting point of the uphill section 130 and rolling out of the ramp groove, in the embodiment of the present utility model, the first guiding line 101 further includes a front limiting section 110 connected to the starting point of the uphill section 130. The front limiting section 110 spirally descends relative to the opposite turntable from its starting point to its ending point, and the slope of the front limiting section 110 is greater than the slope of the uphill section 130, so that the rolling ball 200 must roll over the starting point of the front limiting section 110 to roll out of the ramp groove. Since the rotational torque required for the rolling ball 200 to roll along the front limiting section 110 is greater than the rotational torque required for the rolling ball 200 to roll along the uphill section 130, the rear limiting section 160 is used to achieve soft limiting instead of hard impact. On the one hand, it can prevent the rolling ball 200 from rolling over the front limiting section 110 and rolling out of the ramp groove, and on the other hand, it can prevent the rolling ball 200 from directly impacting the starting point of the inner wall surface of the ramp groove and generating noise.

[0103] In addition, as Figure 8 shown, in order to enable the rolling ball 200 to stay stably at the starting point of the uphill section 130 and maintain a stable braking release state, in the embodiment of the present utility model, the ending point of the front limiting section 110 is connected to the starting point of the uphill section 130 through a front arc section 120. Specifically, the front limiting section 110 extends along the tangent direction at the starting point of the front arc section 120, and the uphill section 130 extends along the tangent direction at the ending point of the front arc section 120, so as to ensure the continuity between the front arc section 120, the front limiting section 110 and the uphill section 130, and prevent the rolling ball 200 from generating noise when rolling between the front limiting section 110, the front arc section 120 and the uphill section 130. Preferably, the radius of the front arc section 120 is equal to the radius of the rolling ball 200.

[0104] Combined with Figure 3 、 Figure 4 and Figure 8 shown, in an embodiment of the present utility model, a plurality of driving-side ramp grooves 310 are connected end to end with each other, and the ending point of the rear limiting section 160 of one ramp groove is smoothly and transitionally connected to the starting point of the front limiting section 110 of the adjacent ramp groove. Specifically, the number of the driving-side ramp grooves 310 is preferably more than three. In this embodiment, the number of both the driving-side ramp grooves 310 and the driven-side ramp grooves 320 is three; the driving-side turntable rotates 120 degrees along the advancing direction X1, and the rolling ball 200 rolls from the starting point of the inner wall surface of the driving-side ramp groove 310 to the ending point of the inner wall surface of the driving-side ramp groove 310; the driving-side turntable rotates 120 degrees along the retracting direction X2, and the rolling ball 200 rolls from the ending point of the inner wall surface of the driving-side ramp groove 310 to the starting point of the inner wall surface of the driving-side ramp groove 310.

[0105] In another embodiment of the present utility model, a plurality of driving-side ramp grooves 310 are not connected but are arranged at intervals in the rotational direction X.

[0106] AsFigure 8 As shown in the figure, in the embodiment of the present utility model, the uphill section 130 includes a front uphill section 131 and a rear uphill section 132. The end point of the front uphill section 131 is connected to the starting point of the rear uphill section 132, and the end point of the rear uphill section 132 is connected to the starting point of the downhill section 140. The slope of the front uphill section 131 is greater than that of the rear uphill section 132, that is, the gradient of the front uphill section 131 is greater than that of the rear uphill section 132.

[0107] By setting the front uphill section 131 with a larger gradient and the rear uphill section 132 with a smaller gradient, the front uphill section 131 is used to improve the braking response speed, and the rear uphill section 132 requires a relatively smaller rotational torque provided by the rotary drive mechanism, which is beneficial to optimizing the performance requirements of the rotary drive mechanism.

[0108] Specifically, the height of the spiral ascent of the front uphill section 131 is equal to the initial distance between the caliper and the brake disc. First, the front uphill section 131 is used to guide the rolling ball 200 to drive the thrust mechanism to move rapidly along the forward direction Y1 to eliminate the gap between the caliper and the brake disc, and then the rear limit section 160 is used to continue to guide the rolling ball 200 to drive the thrust mechanism to move relatively slowly along the forward direction Y1 to gradually increase the thrust until the required braking state is reached between the caliper and the brake disc. In addition, to improve the continuity of the uphill section 130, the end point of the front uphill section 131 and the starting point of the rear uphill section 132 are smoothly and transitionally connected.

[0109] Among them, the slope of the front uphill section 131 may not be specifically limited and can be set according to requirements. For example, the faster the required braking response speed, the greater the slope of the front uphill section 131, and vice versa. The slope of the rear uphill section 132 may also not be specifically limited and can be set according to requirements. For example, the faster the required braking speed, the greater the slope of the rear uphill section 132, and vice versa. The height of the rear uphill section 132 climbing in the forward direction Y1 is not specifically limited and can be set according to requirements. If a greater braking force is required, the height of the rear uphill section 132 climbing in the forward direction Y1 is greater, and vice versa. To ensure a relatively fast braking response speed, the angle occupied by the front uphill section 131 in the rotational direction X should be as small as possible, such as 5° to 15°, preferably 10°; the angle occupied by the rear uphill section 132 in the rotational direction X should be as large as possible, such as 75° to 85°, preferably 80°. And the cumulative spiral ascent height of the rear uphill section 132 should be greater than the deformation amount required for the caliper to generate the maximum clamping force to ensure that the rolling ball 200 can drive the thrust mechanism to generate the required maximum clamping force under the guidance of the rear uphill section 132. In addition, the inclination angle of the front uphill section 131 is preferably 5° to 10°; the inclination angle of the rear uphill section 132 is preferably 2° to 4°.

[0110] Such as Figure 8As shown, in some embodiments of the present utility model, the slope of the rear uphill section 132 is set to be constant from its starting point to its ending point. However, in order to further optimize the performance requirements of the rotary drive mechanism, in other embodiments of the present utility model, the rear uphill section 132 is divided into sections from its starting point to its ending point, and the slope of the latter section is less than that of the former section; or the slope of the rear uphill section 132 is set to gradually decrease from its starting point to its ending point.

[0111] Embodiment 2

[0112] In the embodiments of the present utility model, an electric brake is further provided. The electric brake includes a ball ramp structure as in Embodiment 1. The specific structure, working principle, and beneficial effects of the ball ramp structure in this embodiment are the same as those in Embodiment 1, and will not be elaborated here.

[0113] Embodiment 3

[0114] In the embodiments of the present utility model, a vehicle is further provided. The vehicle includes the electric brake as described in Embodiment 2. The specific structure, working principle, and beneficial effects of the electric brake in this embodiment are the same as those in Embodiment 2, and will not be elaborated here.

[0115] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combinations of elements, components, parts, or steps herein also contemplates embodiments consisting essentially of these elements, components, parts, or steps. Here, by using the term "may", it is intended that any attribute described as "may" included is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into separate multiple elements, components, parts, or steps. The disclosure of "a" or "an" used to describe an element, component, part, or step does not preclude other elements, components, parts, or steps.

[0116] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. The above embodiments are only used to illustrate the technical concept and features of the present invention, aiming to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and shall not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A rolling ball ramp structure, characterized in that: include: A driving side rotor, the driving side rotor comprising a driving side end surface, and a plurality of driving side ramp grooves formed by a spacer ring on the driving side end surface; A driven side rotor, the driven side rotor being coaxially arranged with the driving side rotor, the driven side rotor comprising a driven side end face arranged opposite to the driving side end face, and a plurality of driven side ramp grooves arranged on the driven side end face in an interval ring, the driven side ramp grooves being arranged corresponding to the driving side ramp grooves, the depth variation trend of the driven side ramp grooves being the same as the depth variation trend of the driving side ramp grooves along a preset rotation direction, and an accommodating cavity being formed between the driven side ramp grooves and the corresponding driving side ramp grooves; A plurality of rolling balls are respectively arranged in each of the accommodating cavities, the rolling balls respectively abut against the inner walls on both sides of the driving side ramp groove and / or the rolling balls respectively abut against the inner walls on both sides of the driven side ramp groove, and the rolling balls can move along the driven side ramp groove under the relative rotation drive of the driving side rotor and the driven side rotor, thereby driving the driving side rotor and the driven side rotor to move relative to each other in the axial direction.

2. The ball rolling ramp structure according to claim 1, characterized in that: Along the preset rotation direction, the depth variation of the driving side ramp groove is the same as the depth variation of the driven side ramp groove.

3. The ball rolling ramp structure according to claim 2, characterized in that: The inner wall of the driving side ramp groove includes a first outer curved surface and a first inner curved surface which are connected to each other. The groove bottom of the driving side ramp groove is formed at the junction of the first outer curved surface and the first inner curved surface. The groove bottom of the driving side ramp groove is spaced apart from the rolling ball. Both the first outer curved surface and the first inner curved surface can abut against the rolling ball.

4. The ball rolling ramp structure according to claim 3, characterized in that: The position where the first outer curved surface abuts the rolling ball constitutes a first outer abutment line, and the curvature of the first outer abutment line abutting the rolling ball is not less than the curvature of the rolling ball; and / or, the position where the first inner curved surface abuts the rolling ball constitutes a first inner abutment line, and the curvature of the first inner abutment line abutting the rolling ball is not less than the curvature of the rolling ball.

5. The ball rolling ramp structure according to claim 3, characterized in that: The inner wall of the driven side ramp groove includes a second outer curved surface and a second inner curved surface that are arranged opposite to each other. The groove bottom of the driven side ramp groove is formed at the junction of the second outer curved surface and the second inner curved surface. The groove bottom of the driven side ramp groove is spaced apart from the rolling ball. Both the second outer curved surface and the second inner curved surface can abut against the rolling ball.

6. The ball rolling ramp structure according to claim 5, characterized in that: The position where the second outer curved surface abuts the rolling ball constitutes a second outer abutment line, and the curvature of the second outer abutment line abutting the rolling ball is not less than the curvature of the rolling ball; and / or, the position where the second inner curved surface abuts the rolling ball constitutes a second inner abutment line, and the curvature of the second inner abutment line abutting the rolling ball is not less than the curvature of the rolling ball.

7. The ball rolling ramp structure according to claim 1, characterized in that: The driving side rotor includes a driving side turntable, and a plurality of driving side ramp grooves are equidistantly arranged around the axis of the driving side rotor. The driven side rotor includes a driven side turntable, and a plurality of driven side ramp grooves are equidistantly arranged around the axis of the driven side turntable.

8. The ball rolling ramp structure according to claim 7, characterized in that: The outer wall of the driving side rotating disk is ring-shaped with driving teeth.

9. An electronically controlled brake, characterized in that: The invention comprises a rolling ball ramp structure as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the electronically controlled brake as claimed in claim 9.

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