A brake device

Abstract

The utility model discloses a brake device, it includes ball screw, second part is equipped with first sliding slot, and first sliding slot is helical; A plurality of balls, a plurality of balls are set up in first sliding slot, and move along first sliding slot, piston, the circumferential external surface of second part is set up in piston sleeve, and the circumferential internal surface of piston is equipped with second sliding slot, and first sliding slot corresponds with second sliding slot, and the ball track of first sliding slot and second sliding slot forms, and a plurality of balls are set up in ball track, and the circumferential external surface of piston is equipped with first convex part, and piston and first convex part are integrally formed, calipers, calipers are equipped with inner chamber and first recess, and piston sets up in inner chamber, and first recess and first convex part concave and convex cooperation are used for limiting the axial rotation of piston around its shaft, and first part passes through calipers, ring, ring is fixed in inner chamber, and ring sleeve is set up in the circumferential external surface of piston. The utility model can effectively limit the problem of the axial rotation of piston around its shaft and falling.

Description

Technical Field

[0001] This utility model relates to the field of automotive braking systems, and in particular to a braking device. Background Technology

[0002] In the application of traditional braking system calipers, the piston and the inner cavity of the caliper are usually fitted with a clearance to ensure that the piston can reciprocate along the piston axis under the drive of external force. At the same time, it is necessary to restrict the piston from rotating around its axis to prevent it from failing to brake effectively due to rotation. In current designs, several anti-rotation planes are set on the circumferential outer surface of the corresponding components that drive the piston, which are fitted with the corresponding planes inside the piston with a clearance to achieve the function of preventing the piston from rotating.

[0003] However, although this method can play a certain role in preventing rotation, the frictional torque it generates is small, and its anti-rotation torque is small. Under heavy load anti-rotation conditions, its anti-rotation effect is poor. Furthermore, when the piston moves along its axis towards the friction plate, due to the lack of a stop design, the piston is prone to falling off, which affects the braking effect and poses a safety hazard. Utility Model Content

[0004] The purpose of this invention is to solve the problems of piston rotation around its axis and piston easy detachment. This invention provides a braking device that can effectively limit piston rotation around its axis and prevent piston detachment.

[0005] To solve the above-mentioned technical problems, the present invention discloses a braking device, which includes a ball screw comprising a first part and a second part, the first part and the second part being fixedly connected, the second part having a first groove, the first groove being helical; a plurality of balls disposed within the first groove and moving along the first groove; a piston fitted onto the circumferential outer surface of the second part, the piston having a second groove on its circumferential inner surface, the first groove corresponding to the second groove, the first groove and the second groove forming a ball track, the plurality of balls being disposed within the ball track, the piston having a first protrusion on its circumferential outer surface, the piston being integrally formed with the first protrusion; a caliper having an inner cavity and a first groove, the piston being disposed in the inner cavity, the first groove and the first protrusion engaging to limit the piston's rotation about its axial direction, the first part passing through the caliper; and a ring fixed to the inner cavity, the ring fitted onto the circumferential outer surface of the piston to support the piston.

[0006] By adopting the above technical solution, the piston and the ball nut structure in the traditional design are integrated into one piece. A protrusion is provided on the outer circumferential surface of the piston, and a concave part is provided on the inner surface of the caliper. The concave-convex mating structure effectively restricts the piston's rotation around its axis. Compared with the solution of setting anti-rotation structures on the inner circumferential surface of the piston and the outer circumferential surface of the ball nut, this technical solution can directly achieve the effect of restricting the piston's rotation around its axis. In addition, by setting a ring in the inner cavity, the piston can be supported radially along the piston, avoiding friction between the piston and the caliper and ensuring good braking performance.

[0007] According to another specific embodiment of the present invention, the inner cavity includes an opening; the ring is disposed in the inner cavity and close to the opening, the ring is spaced apart from the first protrusion, and is used to cooperate with the first protrusion to limit the movement distance of the piston along its axial direction.

[0008] By adopting the above technical solution, the ring is placed in the inner cavity near the opening, which can support the piston radially. The ring and the first protrusion are spaced apart. When the piston moves in the direction of the ring along its axis, the first protrusion abuts against the ring, which can effectively prevent the piston from coming out of the inner cavity when it moves in its axis. This double limiting structure can both ensure that the piston is restricted from rotating around its axis and prevent the piston from coming out of the inner cavity, thus ensuring a good braking effect.

[0009] According to another specific embodiment of the present invention, the ring is interference-fitted with the caliper.

[0010] By adopting the above technical solution, the ring can be fixedly connected to the caliper, avoiding friction between the piston and the ring and thus preventing the ring from moving when the piston moves along its axial direction.

[0011] According to another specific embodiment of this utility model, the ring is made of soft rubber material.

[0012] By adopting the above technical solution, when the piston moves along its axis and contacts the ring, the friction can be effectively reduced due to the material properties of the ring being a soft rubber material, thus ensuring a good braking effect.

[0013] According to another specific embodiment of the present invention, the first protrusion is disposed at the end of the piston away from the opening.

[0014] By adopting the above technical solution, the piston's axial movement stroke can be maximized by setting the first protrusion at the end of the piston away from the opening.

[0015] According to another specific embodiment of the present invention, the first protrusion has an arc-shaped structure; the shape of the first groove corresponds to the shape of the first protrusion.

[0016] According to another specific embodiment of the present invention, the first groove extends along the axial direction of the piston and is disposed on the inner surface of the caliper, and the first protrusion is slidably connected to the first groove along the axial direction of the piston.

[0017] By adopting the above technical solution, by slidably connecting the first protrusion to the first groove along the piston axis, it can be effectively ensured that the piston can reciprocate along its axis, while at the same time, it can be ensured that the piston is restricted from rotating around the axis during its movement.

[0018] According to another specific embodiment of the present invention, the piston is further provided with a second protrusion on its circumferential outer surface, and the first protrusion and the second protrusion are disposed on both sides of the circumferential outer surface of the piston along the axial direction of the piston; the inner cavity is further provided with a second groove, and the second groove and the first groove are disposed on both sides of the inner cavity along the axial direction of the piston, and the second protrusion is slidably connected to the second groove along the axial direction of the piston.

[0019] By adopting the above technical solution, corresponding first protrusions and first grooves, as well as second protrusions and second grooves, are symmetrically arranged along the piston axis. That is, limiting structures are set on both sides of the piston along its axis, which can effectively restrict the piston from rotating around its axis and ensure good braking effect.

[0020] According to another specific embodiment of the present invention, the top of the first protrusion is spaced apart from the inner surface of the first groove, and the top of the second protrusion is spaced apart from the inner surface of the second groove.

[0021] By adopting the above technical solution, by setting the top of the first protrusion and the top of the second protrusion at intervals with the inner surfaces of the first groove and the second groove respectively, the frictional force generated by the contact between the piston and the caliper can be effectively reduced, ensuring that the piston can reciprocate along its axial direction.

[0022] According to another specific embodiment of the present invention, the inner cavity is further provided with a support washer, a planar thrust bearing, and a bearing washer; the second part abuts against the support washer, the support washer abuts against the planar thrust bearing, the planar thrust bearing abuts against the bearing washer, and the bearing washer abuts against the caliper; the second part passes through the support washer, the planar thrust bearing, and the bearing washer in sequence, and the support washer, the planar thrust bearing, and the bearing washer are used to support the second part. Attached Figure Description

[0023] Figure 1 A perspective view of the braking device provided in an embodiment of this application is shown.

[0024] Figure 2 An exploded view of the braking device provided in an embodiment of this application is shown.

[0025] Figure 3 A cross-section of the braking device provided in an embodiment of this application is shown. Figure 1 .

[0026] Figure 4 A schematic diagram showing the first and second protrusions of the braking device provided in this application abutting against the ring is shown.

[0027] Figure 5 A cross-section of the braking device provided in an embodiment of this application is shown. Figure 2 . Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0029] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0031] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0034] In the application of traditional braking system calipers, the piston and the inner cavity of the caliper are usually fitted with a clearance to ensure that the piston can reciprocate along the piston axis under the drive of external force, while restricting the piston from rotating around its axis to prevent it from failing to brake effectively due to rotation.

[0035] In some existing embodiments, several anti-rotation planes are provided on the circumferential outer surface of the ball nut used to drive the piston. These planes are fitted with corresponding planes inside the piston to prevent piston rotation. However, while this method can prevent rotation to some extent, the frictional torque it generates is relatively small, resulting in a weak anti-rotation torque. Under heavy load anti-rotation conditions, its anti-rotation effect is poor. Furthermore, when the piston moves axially towards the friction plate, the lack of a stop design makes it prone to detachment, affecting braking performance and posing a safety hazard.

[0036] Therefore, this application provides a braking device that integrates a piston with a ball nut in a conventional design. Specifically, a second groove corresponding to the first groove in the ball screw is provided on the inner circumferential surface of the piston, a protrusion is provided on the outer circumferential surface of the piston, and a recess is provided on the inner surface of the caliper. Through the structure of the protrusion and recess, the piston is restricted from rotating around its axis. Furthermore, a ring is provided in the inner cavity, and the protrusion of the ring restricts the piston from falling out of the inner cavity.

[0037] Specifically, refer to Figures 1 to 3The braking device 100 of this application embodiment includes a ball screw 200, a plurality of balls 300, a piston 400, a caliper 500, and a ring 600. The ball screw 200 includes a first part 210 and a second part 220, which are fixedly connected. The outer circumferential surface of the second part 220 is provided with a first groove 221, which is helical. A plurality of balls 300 are disposed within the first groove 221 and move along it. The piston 400 is sleeved on the outer circumferential surface of the second part 220, and the inner circumferential surface of the piston 400 is provided with a second groove 410. The first groove 221 and the second groove 410 are connected. Corresponding to 10, the first groove 221 and the second groove 410 form a ball track 700, and several balls 300 are disposed in the ball track 700. The circumferential outer surface of the piston 400 is provided with a first protrusion 420, and the piston 400 and the first protrusion 420 are integrally formed. The caliper 500 is provided with an inner cavity 510 and a first groove 511. The piston 400 is disposed in the inner cavity 510. The first groove 511 and the first protrusion 420 are in a concave-convex fit to limit the piston 400 to rotate around its axial direction. The first part 210 passes through the caliper 500. The ring 600 is fixed in the inner cavity 510 and is sleeved on the circumferential outer surface of the piston 400 to support the piston 400.

[0038] Specifically, the first part 210 and the second part 220 of the ball screw 200 are fixedly connected. The outer circumferential surface of the second part 220 and the inner circumferential surface of the piston 400 are respectively provided with a first groove 221 and a second groove 410. The first groove 221 and the second groove 410 form a ball track 700. Several balls 300 are arranged in the ball track 700. The rotation of the ball screw 200 drives the second part 220 to rotate, pushing the several balls 300 to move along the ball track 700, thereby driving the piston 400 to reciprocate along its axial direction.

[0039] For example, the ball screw 200 is driven to rotate by an external motor. However, those skilled in the art will understand that in other embodiments, the ball screw 200 can also be driven to rotate in other ways, such as hydraulic drive, pneumatic drive, etc., and this application does not limit this.

[0040] For example, the first portion 210 is rod-shaped. However, those skilled in the art will understand that in other embodiments, the first portion 210 may be other shapes, such as cylindrical, etc., and this application does not limit this.

[0041] Further, refer to Figure 2 and Figure 3 The inner cavity 510 includes an opening 512, and a ring 600 is spaced apart from the first protrusion 420 for cooperating with the first protrusion 420 to limit the movement distance of the piston 400 along its axial direction.

[0042] Specifically, by placing the ring 600 within the inner cavity 510 near the opening 512, the piston 400 can be radially supported. The ring 600 and the first protrusion 420 are spaced apart. When the piston 400 moves axially toward the ring 600, the first protrusion 420 abuts against the ring 600 (e.g., Figure 4 As shown, this double-limiting structure effectively prevents the piston 400 from dislodging from the inner cavity 510 when it moves along its axial direction. This double-limiting structure can both limit the piston 400 from rotating around its axial direction and prevent the piston 400 from dislodging from the inner cavity 510, thus ensuring a good braking effect.

[0043] For example, refer to Figure 3 The ring 600 is disposed within the inner cavity 510 and near the opening 512. However, those skilled in the art will understand that in other embodiments, the ring 600 may be disposed at other locations within the inner cavity 510, such as the middle of the inner cavity 510, depending on the required stroke distance of the piston 400, and this application does not impose any restrictions on this.

[0044] Further, refer to Figure 3 The 600 ring and the 500 caliper are interference-fitted. The 600 ring is made of soft rubber.

[0045] It should be noted that by interfering with the ring 600 and the caliper 500, the ring 600 and the caliper 500 can be fixedly connected, thus preventing the piston 400 from rubbing against the ring 600 and moving the ring 600 when it moves along its axis.

[0046] For example, the inner ring of the ring 600 is made of nitrile rubber. However, those skilled in the art will understand that in other embodiments, the inner ring of the ring 600 may also be made of other soft rubber materials, such as ethylene propylene rubber, silicone rubber, etc., and this application does not limit this.

[0047] Further, refer to Figure 3 The first protrusion 420 has an arc-shaped structure; the shape of the first groove 511 corresponds to the shape of the first protrusion 420. The first groove 511 extends along the axial direction of the piston 400 and is disposed on the inner surface of the caliper 500, and the first protrusion 420 is slidably connected to the first groove 511 along the axial direction of the piston 400.

[0048] For example, the first protrusion 420 is disposed at the end of the piston 400 away from the opening 512. However, those skilled in the art will understand that in other embodiments, the first protrusion 420 may be disposed at other locations on the piston 400, such as the middle of the circumferential surface of the piston 400, depending on the stroke of the piston 400 moving along its axial direction, and this application does not limit this.

[0049] For example, the first protrusion 420 has an arc-shaped structure. However, those skilled in the art will understand that in other embodiments, the first protrusion 420 can be a structure of other shapes, such as a triangle, and this application does not limit it in this regard.

[0050] Further, refer to Figure 5 The piston 400 is also provided with a second protrusion 430 on its circumferential outer surface. The first protrusion 420 and the second protrusion 430 are arranged on both sides of the circumferential outer surface of the piston 400 along the axial direction of the piston 400. The inner cavity 510 is also provided with a second groove 513. The second groove 513 and the first groove 511 are arranged on both sides of the inner cavity 510 along the axial direction of the piston 400. The second protrusion 430 is slidably connected to the second groove 513 along the axial direction of the piston 400. The top of the first protrusion 420 and the top of the second protrusion 430 are respectively spaced apart from the inner surface of the first groove 511 and the inner surface of the second groove 513.

[0051] For example, the first protrusion 420 and the second protrusion 430 are symmetrically disposed on both sides of the circumferential outer surface of the piston 400 along the axial direction of the piston 400. However, those skilled in the art will understand that in other embodiments, the first protrusion 420 and the second protrusion 430 may be asymmetrically disposed, and this application does not limit this.

[0052] For example, the circumferential surface of the piston 400 is provided with two protrusions. However, those skilled in the art will understand that in other embodiments, the circumferential surface of the piston 400 may be provided with other numbers of protrusions, such as three, four, five, or any other number, and this application does not limit this.

[0053] It should be noted that the top of the first protrusion 420 is spaced apart from the inner surface of the first groove 511, and the top of the second protrusion 430 is spaced apart from the inner surface of the second groove 513, thereby preventing the first protrusion 420 and the second protrusion 430 from generating excessive friction with the first groove 511 and the second groove 513, thereby affecting the reciprocating movement of the piston 400 along its axial direction.

[0054] Back Figure 2 and Figure 3 The inner cavity 510 is also provided with a support washer 800a, a planar thrust bearing 800b, and a bearing washer 800c; the second part 220 abuts against the support washer 800a, the support washer 800a abuts against the planar thrust bearing 800b, the planar thrust bearing 800b abuts against the bearing washer 800c, and the bearing washer 800c abuts against the caliper 500; the first part 210 passes through the support washer 800a, the planar thrust bearing 800b, and the bearing washer 800c in sequence, and the support washer 800a, the planar thrust bearing 800b, and the bearing washer 800c are used to support the ball screw 200.

[0055] Specifically, the coordinated operation of the second part 220, the support washer 800a, the planar thrust bearing 800b, and the bearing washer 800c achieves multi-level support and load transfer for the ball screw 200.

[0056] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A brake device characterized by comprising: include: A ball screw includes a first part and a second part, which are fixedly connected. The second part is provided with a first groove, which is spiral in shape. Several ball bearings are disposed in the first groove and move along the first groove; A piston is sleeved on the circumferential outer surface of the second part. The circumferential inner surface of the piston is provided with a second sliding groove. The first sliding groove corresponds to the second sliding groove. The first sliding groove and the second sliding groove form a ball track. The plurality of balls are disposed in the ball track. The circumferential outer surface of the piston is provided with a first protrusion. The piston and the first protrusion are integrally formed. The caliper has an inner cavity and a first groove, the piston is disposed in the inner cavity, the first groove and the first protrusion are in a concave-convex fit to limit the piston to rotate about its axial direction, and the first part passes through the caliper; A ring is fixed to the inner cavity and sleeved on the circumferential outer surface of the piston to support the piston.

2. The brake device according to claim 1, wherein The cavity includes an opening; The ring is disposed within the inner cavity and close to the opening. The ring is spaced apart from the first protrusion and is used to cooperate with the first protrusion to limit the piston's axial movement distance.

3. The brake device according to claim 2, wherein The ring is interference-fitted with the caliper.

4. The brake device according to claim 3, wherein The ring is made of soft rubber material.

5. The brake device of claim 2, wherein The first protrusion is located at the end of the piston away from the opening.

6. The brake device of claim 5, wherein The first protrusion has an arc-shaped structure; The shape of the first groove corresponds to the shape of the first protrusion.

7. The brake device of claim 6, wherein The first groove extends along the axial direction of the piston and is disposed on the inner surface of the caliper, and the first protrusion is slidably connected to the first groove along the axial direction of the piston.

8. The brake device according to claim 7, wherein The piston is further provided with a second protrusion on its circumferential outer surface. The first protrusion and the second protrusion are arranged on both sides of the circumferential outer surface of the piston along the axial direction of the piston. The inner cavity is further provided with a second groove, which is disposed on both sides of the inner cavity along the axial direction of the piston, and the second protrusion is slidably connected to the second groove along the axial direction of the piston.

9. The brake device of claim 8, wherein The top of the first protrusion is spaced apart from the inner surface of the first groove, and the top of the second protrusion is spaced apart from the inner surface of the second groove.

10. The brake device of claim 9, wherein The inner cavity is also equipped with a support washer, a planar thrust bearing, and a bearing washer. The second part abuts against the support washer, the support washer abuts against the planar thrust bearing, the planar thrust bearing abuts against the bearing washer, and the bearing washer abuts against the caliper; The second part passes sequentially through the support washer, the planar thrust bearing, and the bearing washer, which are used to support the second part.

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