Brake device for vehicle

Abstract

A brake device for a vehicle includes: a caliper body provided with a cylinder; a nut screw rotatably disposed on the cylinder; the bolt screw can move in a first direction or a second direction opposite to the first direction along with rotation of the nut screw; a piston movably disposed in the cylinder and configured to move in a first direction by pressurization of the bolt screw, and the piston interferes with the bolt screw to restrict rotation of the bolt screw; and a retainer fastened to the cylinder and configured to interfere with the piston to limit rotation of the piston. Through the present disclosure, a second interference portion formed on the piston interferes with a fourth interference portion formed on the retainer to prevent rotation of the piston, and a third interference portion formed on the bolt head portion interferes with a first interference portion formed on the piston to prevent rotation of the bolt screw.

Description

Technical Field

[0001] Exemplary embodiments of this disclosure relate to a braking device for a vehicle, and more specifically, to a braking device for a vehicle that can ensure stable braking performance. Background Technology

[0002] Typically, vehicle braking systems use driving force to push pistons to make the pads and discs come into close contact, and use the friction between the pads and discs to brake the vehicle.

[0003] In vehicle braking systems, electromechanical brakes (EMBs) do not use hydraulic pressure. Instead, they have an electric motor-driven actuator mounted on the caliper to pressurize the piston to generate braking force by either converting the rotational motion of the screw into the linear motion of the nut or vice versa.

[0004] EMB can perform active and independent braking on each wheel, thus enabling not only general main braking but also all additional functions such as anti-lock braking system (ABS), electronic stability control (ESC), traction control system (TCS), and automatic emergency braking (AEB), and achieving higher performance due to the absence of hydraulic transmission delay.

[0005] The related technology disclosed herein is disclosed in Korean Patent Application Publication No. 10-2024-0054695 (published on April 26, 2024, and entitled "Brake Device for Vehicles"). Summary of the Invention

[0006] The purpose of this disclosure is to provide a braking device for a vehicle that can ensure stable braking performance.

[0007] The braking device for a vehicle according to this disclosure includes: a caliper body having a cylinder; a nut screw rotatably disposed on the cylinder; a bolt screw movable in a first direction or in a second direction opposite to the first direction as the nut screw rotates; a piston movably disposed in the cylinder and configured to move in the first direction by pressure from the bolt screw, and the piston interfering with the bolt screw to limit the rotation of the bolt screw; and a retainer fastened to the cylinder and configured to interfere with the piston to limit the rotation of the piston.

[0008] The piston may include: a piston body portion into which a bolt is inserted; a first interference portion disposed on the inner circumferential surface of the piston body portion and configured to interfere with the bolt; and a second interference portion disposed on the outer circumferential surface of the piston body portion and configured to interfere with a retainer.

[0009] The first interference portion can be formed to protrude from the inner peripheral surface of the piston body portion, and the second interference portion can be formed to be recessed on the outer peripheral surface of the piston body portion.

[0010] The second interference portion can extend in a direction parallel to the first and second directions.

[0011] The bolt may include: a bolt body portion coupled to a nut screw via ball bearings; a bolt head portion configured to pressurize the piston body portion; and a third interference portion disposed on the outer peripheral surface of the bolt head portion and capable of contacting the first interference portion.

[0012] The third interference portion can be formed into a flat surface by removing a portion of the outer peripheral surface of the bolt head portion.

[0013] The retainer may include: a retainer body portion, which is annular in shape and disposed between the cylinder and the piston; and a fourth interference portion disposed on the inner circumferential surface of the retainer body portion and capable of contacting the second interference portion.

[0014] The fourth interference portion can be formed to protrude from the inner circumferential surface of the holder body portion.

[0015] The retainer may also include a damper portion that is coupled to the retainer body portion and is capable of contacting the piston.

[0016] The damper section may be further provided with a protrusion mounted on the piston.

[0017] According to this disclosure, the second interference portion formed on the piston interferes with the fourth interference portion formed on the retainer, thereby preventing the piston from rotating; and the third interference portion formed on the bolt head portion interferes with the first interference portion formed on the piston, thereby preventing the bolt screw from rotating.

[0018] With this disclosure, the elastic force of the protrusion formed on the damper portion is applied to the piston toward the center portion of the piston, thereby keeping the piston centered.

[0019] With this disclosure, the grooves formed between the multiple protrusions can be used as grease (lubricant) pockets to form a stable lubricating film as the piston moves, thereby minimizing the frictional resistance of the piston. Attached Figure Description

[0020] Figure 1 This is a perspective view of a braking device for a vehicle according to an embodiment of the present disclosure, viewed from one direction.

[0021] Figure 2 When viewed from another direction Figure 1 A three-dimensional image.

[0022] Figure 3 This is a schematic cross-sectional view of a braking device for a vehicle according to a first embodiment of the present disclosure.

[0023] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0024] Figure 5 This is an exploded perspective view of the construction of a braking device for a vehicle according to the first embodiment of the present disclosure, when viewed from one direction.

[0025] Figure 6 When viewed from another direction Figure 5 An exploded 3D diagram.

[0026] Figure 7 This is a schematic cross-sectional view of a braking device for a vehicle according to a second embodiment of the present disclosure.

[0027] Figure 8 yes Figure 7 A magnified view of a portion of the image.

[0028] Figure 9 This is an exploded perspective view of the construction of a braking device for a vehicle according to the second embodiment of the present disclosure, when viewed from one direction.

[0029] Figure 10 When viewed from another direction Figure 9 An exploded 3D diagram.

[0030] Figure 11 and Figure 12 This is a partially enlarged cross-sectional view schematically illustrating the assembly process of a braking device for a vehicle according to an embodiment of the present disclosure. Detailed Implementation

[0031] In the following description, a braking device for a vehicle will be illustrated with reference to the accompanying drawings through various exemplary embodiments. It should be understood that, for clarity and convenience, the thickness of each line or the size of each component in the drawings may be exaggerated. Furthermore, the terminology used herein is defined in consideration of its function in this disclosure, and these terms may be changed according to the intent or practice of the user or operator. Therefore, these terms should be defined based on the overall disclosure set forth herein.

[0032] Figure 1 This is a perspective view of a braking device for a vehicle according to an embodiment of the present disclosure, viewed from one direction. Figure 2 When viewed from another direction Figure 1 A three-dimensional image. Figure 3 This is a schematic cross-sectional view of a braking device for a vehicle according to a first embodiment of the present disclosure. Figure 4 yes Figure 3 A magnified view of a portion of the image. Figure 5 This is an exploded perspective view of the construction of a braking device for a vehicle according to the first embodiment of the present disclosure, when viewed from one direction. Figure 6 When viewed from another direction Figure 5 An exploded 3D diagram.

[0033] refer to Figures 1 to 6 The braking device for a vehicle according to the first embodiment of the present disclosure includes a caliper body 100, a piston 200, a nut screw 300, a bolt screw 400, and a retainer 500, which will be described in detail below.

[0034] The caliper body 100 can form the general appearance of a braking device for a vehicle according to this embodiment, and can integrally support the piston 200, nut screw 300, bolt screw 400 and retainer 500.

[0035] The caliper body 100 according to this embodiment may include a bridging member 110, a finger member 120, and a cylinder 130.

[0036] The bridging member 110 can form the central appearance of the caliper body 100 and can support the finger member 120 and the cylinder 130. The bridging member 110 can be connected to the carrier 10 via the guide rod 11, which is fixed to the steering knuckle (not shown) or the like.

[0037] The bridging member 110 can be connected to the carrier 10 to enable reciprocating motion along a first direction D1 or a second direction D2. The first direction D1 and the second direction D2 can be parallel to the central axis C1 of the brake disc 20 (i.e., Figure 3 (The X-axis in the diagram) and the opposite directions are used as examples.

[0038] The lower surface of the bridging member 110 can be arranged to face the peripheral surface of the brake disc 20 by being spaced apart from the peripheral surface of the brake disc 20 by a predetermined distance. The two sides of the bridging member 110 can extend relative to the brake disc 20 along a first direction D1 and a second direction D2, respectively.

[0039] A pair of brake pads 30 may be arranged below the bridge member 110. The pair of brake pads 30 may be spaced apart from each other along the central axis C1 of the brake disc 20. The pair of brake pads 30 may be arranged facing each other, with the brake disc 20 between them.

[0040] One of the brake pads 30 can be arranged to be spaced apart from the brake disc 20 along a first direction D1, and the other brake pad 30 can be arranged to be spaced apart from the brake disc 20 along a second direction D2.

[0041] The brake pads 30 can be supported on the carrier 10 or the bridging member 110 so as to be slidably movable in the first direction D1 and the second direction D2. Friction pads, including materials with a high coefficient of friction (such as rubber), can be attached to a surface of the brake pads 30 facing the brake disc 20.

[0042] The finger 120 can extend downward from one side of the bridging member 110. The finger 120 can be arranged to face either of the pair of brake pads 30.

[0043] The finger 120 can be arranged to face one of a pair of brake pads 30 that is spaced apart from the brake disc 20 in a first direction D1.

[0044] When the bridging member 110 moves along the second direction D2, the finger member 120 can pressurize the brake pad 30, which is spaced apart from the brake disc 20 in the first direction D1, toward the brake disc 20.

[0045] The cylinder 130 can extend downward from the other side of the bridging member 110. The cylinder 130 can be formed as a cylinder with a hollow interior and an opening on one side. The opening side of the cylinder 130 can be arranged to face the other brake pad 30 of a pair of brake pads 30.

[0046] The open side of the cylinder 130 can be arranged to face the brake pad 30 that is spaced apart from the brake disc 20 in the second direction D2. The open side of the cylinder 130 can be spaced apart from the brake pad 30 that is spaced apart from the brake disc 20 in the second direction D2 by a set distance.

[0047] The central axis C2 of cylinder 130 can be arranged parallel to the central axis C1 of brake disc 20. The central axis C2 of cylinder 130 can be spaced apart from the central axis C1 of brake disc 20 along a third direction D3.

[0048] The third direction D3 can be exemplified as a direction perpendicular to the first direction D1 and the second direction D2 and from the central axis C1 of the brake disc 20 toward the central axis C2 of the cylinder 130.

[0049] When the lower surface of the bridging member 110 is arranged parallel to the ground, the third direction D3 can be a direction perpendicular to the ground, that is, along... Figure 3 The z-axis direction is upward.

[0050] The piston 200 can be mounted in the cylinder 130 and movable in a first direction D1 or a second direction D2. The piston 200 can be arranged inside the cylinder 130. The piston 200 can be formed as a hollow shape with an opening on one side. The closed side of the piston 200 can be arranged to point toward the brake pad 30, which is arranged to face the cylinder 130.

[0051] The open side of the piston 200 can be arranged to point towards the interior space of the cylinder 130. The outer surface of the piston 200 can be supported on the inner surface of the cylinder 130 to move slidably. Alternatively, the outer surface of the piston 200 can be spaced apart from the inner surface of the cylinder 130 by a set distance to form a gap.

[0052] When moving in the first direction D1, the piston 200 can protrude outward toward the cylinder 130 and pressurize the brake pad 30 arranged to face the cylinder 130 (which faces the brake disc 20).

[0053] The bridging member 110 can move in the second direction D2 by the reaction force generated between the piston 200 and the brake pad 30. When moving in the second direction D2, the piston 200 can release the pressure applied to the brake pad 30 and can separate from the brake pad 30.

[0054] The piston 200 may interfere with the bolt 400 to limit the rotation of the bolt 400. The bolt 400 may interfere with the piston 200 to limit the axial rotation of the bolt 400. The piston 200 may include a piston body portion 210, a first interference portion 220, and a second interference portion 230.

[0055] The piston body portion 210 can form the overall appearance of the piston 200 and can be formed into a cylindrical shape with a hollow interior. A bolt 400 can be inserted into the piston body portion 210. More specifically, a bolt head portion 420 can be inserted into the piston body portion 210.

[0056] The first interference portion 220 may be disposed on the inner circumferential surface of the piston body portion 210. The first interference portion 220 may interfere with the bolt screw 400. More specifically, the first interference portion 220 may interfere with the bolt head portion 420.

[0057] The first interference portion 220 may be formed to protrude from the inner peripheral surface of the piston body portion 210. The first interference portion 220 may extend from the inner peripheral surface of the piston body portion 210 toward the center portion of the piston body portion 210 with a set thickness. The first interference portion 220 may be formed as a flat surface.

[0058] In another embodiment, if the third interference portion 430 has a convex shape, the first interference portion 220 may also be formed as a recess on the inner circumferential surface of the piston body portion 210.

[0059] Multiple first interference portions 220 can be provided. The multiple first interference portions 220 can be arranged to be spaced apart from each other along the circumferential direction of the piston body portion 210. For example, a pair of first interference portions 220 can be arranged to face each other.

[0060] A pair of first interference portions 220 can be arranged on both sides of the piston body portion 210. More specifically, when the piston body portion 210 is viewed from the front, the pair of first interference portions 220 can be arranged at the 3 o'clock and 9 o'clock positions of the piston body portion 210, respectively.

[0061] The second interference portion 230 may be disposed on the outer peripheral surface of the piston body portion 210. The second interference portion 230 may interfere with the retainer 500. More specifically, the second interference portion 230 may interfere with the fourth interference portion 520.

[0062] The second interference portion 230 can be formed as a recess on the outer peripheral surface of the piston body portion 210. The second interference portion 230 can be formed as having a recessed shape.

[0063] In another embodiment, if the fourth interference portion 520 has a recessed shape, the second interference portion 230 may also be formed to protrude from the outer peripheral surface of the piston body portion 210.

[0064] The second interference portion 230 can guide the linear movement of the piston 200 in the first direction D1 or the second direction D2. The second interference portion 230 can extend along the central axis C3 of the piston 200.

[0065] The second interference portion 230 may extend along the length direction of the piston body portion 210 (i.e., along a direction parallel to the first direction D1 and / or the second direction D2). The second interference portion 230 may be formed as an elongated hole shape with a set length.

[0066] The piston cover 600 can be installed inside the cylinder 130 to prevent the entry of foreign objects and to make the interior of the cylinder 130 waterproof. The piston cover 600 can be installed between the cylinder 130 and the piston 200. The piston cover 600 can be coupled to the piston body portion 210 and can be press-fitted into the cylinder 130.

[0067] The piston cover 600 can be formed to surround the piston body portion 210. The piston cover 600 can be arranged from the second interference portion 230 and the retainer 500 along the first direction D1. The piston cover 600 can contact the retainer 500.

[0068] The piston cover 600 may include an elastic, deformable material. For example, the piston cover 600 may be made of a rubber material. The piston cover 600 may be formed with a corrugated shape.

[0069] The nut screw 300 can be rotatably arranged in the cylinder 130 and can be connected to the bolt screw 400. A bearing 700 that rotatably supports the nut screw 300 can be installed inside the cylinder 130. The bearing 700 can be exemplified by a ball bearing disposed between the cylinder 130 and the nut screw 300.

[0070] The nut and screw 300 can be formed into a hollow shape with an internal cavity and open ends. The nut and screw 300 can be arranged inside the cylinder 130, and the central axis of the nut and screw 300 can be coaxially positioned with the central axis C2 of the cylinder 130.

[0071] One side of the nut screw 300 ( Figure 3 The left side of the nut screw 300 can be arranged to face the inner surface of the piston 200 by a predetermined distance from the piston 200. Figure 3 The right side of the cylinder 130 can protrude to the outside of the cylinder 130 by penetrating the closed side of the cylinder 130.

[0072] The other side of the nut screw 300 can be connected to a power transmission device (not shown) that receives rotational force from an actuator (not shown). The actuator can be exemplified as various types of motors capable of generating rotational force by receiving power from a vehicle battery (not shown).

[0073] A power transmission device can transmit the rotational force of the actuator to the nut screw 300. The power transmission device may include multiple gears sequentially engaged between the actuator and the nut screw 300. However, the power transmission device is not limited to this configuration, and the type of power transmission device capable of receiving rotational force from the actuator to rotate the nut screw 300 can vary with design changes.

[0074] When the actuator is running, the nut screw 300 can receive the rotational force generated by the actuator through the power transmission device, and can rotate clockwise or counterclockwise around the central axis of the nut screw 300.

[0075] The nut screw 300 can be arranged such that its inner surface faces the outer surface of the bolt screw 400. A ball track can be formed on the inner circumferential surface of the nut screw 300, wherein one circumferential side of the spherical ball member B is positioned on the ball track. The ball track can extend in a helical shape along the length of the nut screw 300 to provide a circulation path for the ball member B.

[0076] In conjunction with the rotation of the nut screw 300, the bolt screw 400 can move inside the cylinder 130 in a first direction D1 or a second direction D2. The bolt screw 400 can be arranged inside the nut screw 300. The bolt screw 400 can be arranged to penetrate both ends of the nut screw 300.

[0077] When the bolt screw 400 moves in the first direction D1, it can pressurize the piston 200 in the first direction D1, and when the bolt screw 400 moves in the second direction D2, it can release the pressure on the piston 200.

[0078] The bolt 400 may include a bolt body portion 410, a bolt head portion 420, and a third interference portion 430.

[0079] The bolt body portion 410 can be formed as a rod with a generally circular cross-section. The bolt body portion 410 can be arranged inside the cylinder 130, and the central axis of the bolt body portion 410 can be coaxially positioned with the central axis C2 of the cylinder 130. The bolt body portion 410 can be coupled to the nut screw 300 via the ball bearing member B.

[0080] A ball track can be formed on the outer peripheral surface of the bolt body portion 410, wherein the other circumferential side of the ball member B is disposed on the ball track. The ball track can extend in a helical shape along the length direction of the bolt body portion 410 to provide a circulation path for the ball member B. Therefore, when the nut screw 300 rotates, the bolt body portion 410 can move in a first direction D1 or a second direction D2 by the circumferential motion of the ball member B.

[0081] The bolt head portion 420 can be disposed between the bolt body portion 410 and the piston 200. The bolt head portion 420 can be formed to have a generally circular cross-section. The bolt head portion 420 can be inserted into the piston body portion 210. The bolt head portion 420 can be arranged to face the inner surface of the piston body portion 210 by being spaced apart from the piston body portion 210 by a predetermined distance.

[0082] The bolt head portion 420 can pressurize the piston body portion 210. The bolt head portion 420 can pressurize or release the pressure on the piston body portion 210 in the first direction D1, depending on the direction of movement of the bolt body portion 410.

[0083] The bolt head portion 420 can be located on one side of the bolt body portion 410, which is arranged to face the piston 200. Figure 3 (on the left side of the middle).

[0084] The diameter of the bolt head portion 420 can be made larger than the diameter of the bolt body portion 410. The outer diameter of the bolt head portion 420 can be made larger than the inner diameter of the nut shank 300. Therefore, the bolt head portion 420 can protrude from the nut shank 300.

[0085] When the bolt body portion 410 moves in the first direction D1, the bolt head portion 420 can contact the inner surface of the piston body portion 210 and can apply pressure to the piston body portion 210 in the first direction D1.

[0086] When the bolt body portion 410 moves in the second direction D2, the bolt head portion 420 can separate from the inner surface of the piston body portion 210 and release the pressure applied to the piston body portion 210.

[0087] The third interference portion 430 can be disposed on the outer peripheral surface of the bolt head portion 420. The third interference portion 430 can contact the first interference portion 220. The third interference portion 430 can interfere with the first interference portion 220.

[0088] The third interference portion 430 can be formed as a flat surface to correspond to the first interference portion 220. The third interference portion 430 can be formed as a flat surface by cutting off a portion of the outer peripheral surface of the bolt head portion 420.

[0089] The third interference portion 430 can make surface contact with the first interference portion 220. In another embodiment, if the first interference portion 220 has a concave shape, the third interference portion 430 can also be formed to protrude from the outer peripheral surface of the bolt head portion 420.

[0090] Multiple third interference portions 430 can be provided. The multiple third interference portions 430 can be arranged to be spaced apart from each other along the circumferential direction of the bolt head portion 420. For example, a pair of third interference portions 430 can be arranged to face each other.

[0091] The third interference portions 430 can be arranged on both sides of the bolt head portion 420. More specifically, when viewed from the front, the third interference portions 430 can be arranged at the 3 o'clock and 9 o'clock positions of the bolt head portion 420, respectively. That is, the third interference portions 430 can be arranged at positions corresponding to the first interference portions 220. Since the third interference portions 430 interfere with the first interference portions 220, the axial rotation of the bolt thread 400 can be restricted.

[0092] According to this embodiment, the bolt head portion 420 may be further provided with a pressurizing portion 421 that contacts the inner surface of the piston body portion 210.

[0093] The pressure portion 421 may be formed to protrude from the bolt head portion 420. The pressure portion 421 may protrude from the outer peripheral surface of the bolt head portion 420 and may be formed along the circumferential direction of the bolt head portion 420.

[0094] The pressurizing part 421 can be provided on the side of the bolt head part 420 facing the direction of the piston 200. Figure 4 (on the left side of the middle).

[0095] The retainer 500 can be fixed to the cylinder 130. The retainer 500 can interfere with the piston 200 to limit the rotation of the piston 200. The piston 200 can interfere with the retainer 500 to limit the axial rotation of the piston 200. The retainer 500 can include a metallic material.

[0096] The retainer 500 may include a retainer body portion 510 and a fourth interference portion 520.

[0097] The retainer body portion 510 can be formed as an annular ring. The retainer body portion 510 can be arranged between the cylinder 130 and the piston 200. The retainer body portion 510 can be located between the inner surface of the cylinder 130 and the outer peripheral surface of the piston body portion 210.

[0098] The outer peripheral surface of the retainer body portion 510 can be in close contact with the inner surface of the cylinder 130, and the inner peripheral surface of the retainer body portion 510 can be in close contact with the outer peripheral surface of the piston body portion 210.

[0099] The retainer body portion 510 can be fixed to the cylinder 130 by means of coupling method (such as bolt coupling or pin coupling) to the inner surface of the cylinder 130, and can be fixed to the cylinder 130 by means of assembly method (such as press fit or serrated press fit) to the inside of the cylinder 130.

[0100] The fourth interference portion 520 may be disposed on the inner peripheral surface of the holder body portion 510. The fourth interference portion 520 may contact the second interference portion 230. The fourth interference portion 520 may interfere with the second interference portion 230.

[0101] The fourth interference portion 520 may be formed to protrude from the inner peripheral surface of the holder body portion 510. The fourth interference portion 520 may be formed to have a generally protruding shape. The fourth interference portion 520 may extend from the inner peripheral surface of the holder body portion 510 toward the center portion of the holder body portion 510 with a set thickness.

[0102] The fourth interference portion 520 can be accommodated within the second interference portion 230, so as to be placed inside the second interference portion 230.

[0103] In another embodiment, if the second interference portion 230 has a convex shape, the fourth interference portion 520 may also be formed as a recess on the inner peripheral surface of the holder body portion 510.

[0104] Multiple fourth interference portions 520 can be provided. The multiple fourth interference portions 520 can be arranged to be spaced apart from each other along the circumferential direction of the holder body portion 510. For example, a pair of fourth interference portions 520 can be arranged to face each other.

[0105] The fourth interference portion 520 can be arranged on both sides of the holder body portion 510. More specifically, when the holder body portion 510 is viewed from the front, the fourth interference portion 520 can be arranged at the 3 o'clock and 9 o'clock positions of the holder body portion 510. That is, the fourth interference portion 520 can be arranged at the position corresponding to the second interference portion 230.

[0106] Since the retainer body 510 is fixed to the cylinder 130, and the fourth interference portion 520 interferes with the second interference portion 230, the axial rotation of the piston 200 can be restricted. Because the axial rotation of the piston 200 is restricted, the axial rotation of the bolt screw 400 can also be restricted.

[0107] Furthermore, since the fourth interference portion 520 is located inside the second interference portion 230, it can guide the linear movement of the piston 200 in the first direction D1 or the second direction D2.

[0108] Figure 7 This is a schematic cross-sectional view of a braking device for a vehicle according to a second embodiment of the present disclosure. Figure 8 yes Figure 7 A magnified view of a portion of the image. Figure 9 This is an exploded perspective view of the construction of a braking device for a vehicle according to the second embodiment of the present disclosure, when viewed from one direction. Figure 10 When viewed from another direction Figure 9 An exploded 3D diagram.

[0109] refer to Figures 1 to 10 According to the second embodiment of the present disclosure, the braking device for a vehicle includes a caliper body 100, a piston 200, a nut screw 300, a bolt screw 400, and a retainer 500.

[0110] In describing a braking device for a vehicle according to a second embodiment of the present disclosure, the retainer 500 in a braking device for a vehicle according to a first embodiment of the present disclosure and the damper portion 530 (not described) in a braking device for a vehicle according to a first embodiment of the present disclosure will be described below.

[0111] For the remaining construction of the braking device for a vehicle according to the second embodiment of the present disclosure, the same description of the braking device for a vehicle according to the first embodiment of the present disclosure can be applied.

[0112] The retainer 500 can be fixed to the cylinder 130. The retainer 500 can interfere with the piston 200 to limit the rotation of the piston 200. The piston 200 can interfere with the retainer 500 to limit the axial rotation of the piston 200. The retainer 500 can include a metallic material.

[0113] The retainer 500 may include a retainer body portion 510, a fourth interference portion 520, and a damper portion 530.

[0114] The retainer body portion 510 can be formed as an annular ring. The retainer body portion 510 can be arranged between the cylinder 130 and the piston 200. The retainer body portion 510 can be located between the inner surface of the cylinder 130 and the outer peripheral surface of the piston body portion 210.

[0115] The retainer body portion 510 can be fixed to the cylinder 130 by means of coupling method (such as bolt connection or pin coupling) to the inner surface of the cylinder 130, and can be fixed to the cylinder 130 by means of assembly method (such as press fit or serrated press fit) to the inside of the cylinder 130.

[0116] The fourth interference portion 520 may be disposed on the inner peripheral surface of the holder body portion 510. The fourth interference portion 520 may contact the second interference portion 230. The fourth interference portion 520 may interfere with the second interference portion 230.

[0117] The fourth interference portion 520 may be formed to protrude from the inner peripheral surface of the holder body portion 510. The fourth interference portion 520 may be formed to have a generally protruding shape. The fourth interference portion 520 may extend from the inner peripheral surface of the holder body portion 510 toward the center portion of the holder body portion 510 with a set thickness.

[0118] The fourth interference portion 520 can be accommodated within the second interference portion 230, so as to be placed inside the second interference portion 230.

[0119] In another embodiment, if the second interference portion 230 has a convex shape, the fourth interference portion 520 may also be formed as a recess on the inner peripheral surface of the holder body portion 510.

[0120] Multiple fourth interference portions 520 can be provided. The multiple fourth interference portions 520 can be arranged to be spaced apart from each other along the circumferential direction of the holder body portion 510. For example, a pair of fourth interference portions 520 can be arranged to face each other.

[0121] The fourth interference portion 520 can be arranged on both sides of the holder body portion 510. More specifically, when the holder body portion 510 is viewed from the front, the fourth interference portion 520 can be arranged at the 3 o'clock and 9 o'clock positions of the holder body portion 510. That is, the fourth interference portion 520 can be arranged at the position corresponding to the second interference portion 230.

[0122] Since the retainer body 510 is fixed to the cylinder 130, and the fourth interference portion 520 interferes with the second interference portion 230, the axial rotation of the piston 200 can be restricted. Because the axial rotation of the piston 200 is restricted, the axial rotation of the bolt screw 400 can also be restricted.

[0123] Furthermore, since the fourth interference portion 520 is located inside the second interference portion 230, it can guide the linear movement of the piston 200 in the first direction D1 or the second direction D2.

[0124] The damper portion 530 may be coupled to the retainer body portion 510. The damper portion 530 may be positioned and configured to surround the retainer body portion 510. The damper portion 530 may contact the piston 200.

[0125] The damper portion 530 can be disposed between the retainer body portion 510 and the piston 200. The damper portion 530 can be disposed between the inner peripheral surface of the retainer body portion 510 and the outer peripheral surface of the piston body portion 210. The damper portion 530 can be in close contact with the piston body portion 210.

[0126] The damper portion 530 may include an elastically deformable material. For example, the damper portion 530 may be made of a rubber material. The damper portion 530 may be integrally disposed with the retainer body portion 510. The damper portion 530 may be inserted into the retainer 500. The fourth interference portion 520 may protrude from the damper portion 530.

[0127] The damper portion 530 can elastically support the piston 200. More specifically, the damper portion 530 can elastically support the piston body portion 210.

[0128] The damper portion 530 may be further provided with a protrusion 531. The protrusion 531 may be formed to protrude from the outer surface of the damper portion 530 that contacts the piston body portion 210. The protrusion 531 may be disposed on the piston 200. The protrusion 531 may be disposed on the outer peripheral surface of the piston body portion 210.

[0129] Multiple protrusions 531 can be arranged spaced apart from each other along the direction of the central axis C4 of the retainer 500. Here, the central axis C4 of the retainer 500 can be positioned coaxially with the central axis C3 of the piston 200.

[0130] The elastic force of the protrusion 531 is applied to the center of the piston 200, allowing the piston 200 to remain centered. Therefore, the piston 200 can move smoothly in a straight line when it moves in the first direction D1 or the second direction D2, thereby ensuring the linear stability of the piston 200.

[0131] In addition, the protrusion 531 can absorb the vibration generated when the piston 200 moves in the first direction D1 or the second direction D2, thereby reducing the rattling noise.

[0132] When the piston 200 moves in the first direction D1 or the second direction D2, the grooves formed between a plurality of protrusions 531 arranged spaced apart from each other in the direction along the central axis C4 of the retainer 500 can act as grease (lubricant) pockets to form a stable lubricating film, thereby minimizing the frictional resistance of the piston 200.

[0133] The following is a description of the assembly process of a braking device for a vehicle having the above configuration according to an embodiment of the present disclosure.

[0134] Figure 11 and Figure 12 This is a partially enlarged cross-sectional view schematically illustrating the assembly process of a braking device for a vehicle according to an embodiment of the present disclosure.

[0135] refer to Figure 11The retainer 500 is press-fitted into the cylinder 130. A load is applied to the retainer body portion 510 in the second direction D2 to press-fit the retainer body portion 510 into the cylinder 130. The retainer body portion 510 can be fixed to the cylinder 130 by means of an assembly method (such as a press-fit or a serrated press-fit) to secure the retainer body portion 510 inside the cylinder 130, and can be fixed to the cylinder 130 by means of a coupling method (such as a bolt coupling or a pin coupling) to secure the retainer body portion 510 to the inner surface of the cylinder 130.

[0136] refer to Figure 12 The piston 200 is inserted into the cylinder 130. The piston cover 600 is press-fitted into the cylinder 130 by applying a load (which is less than the load applied to the retainer body portion 510) to the piston cover 600 coupled to the piston body portion 210 in a second direction.

[0137] In the braking device for a vehicle according to an embodiment of the present disclosure, the second interference portion 230 formed on the piston 200 interferes with the fourth interference portion 520 formed on the retainer 500, thereby preventing the piston 200 from rotating, and the third interference portion 430 formed on the bolt head portion 420 interferes with the first interference portion 220 formed on the piston 200, thereby preventing the bolt screw 400 from rotating.

[0138] By means of the braking device for a vehicle according to an embodiment of the present disclosure, the elastic force of the protrusion 531 formed on the damper portion 530 is applied toward the center portion of the piston 200 to the piston 200, thereby keeping the piston 200 centered.

[0139] In the braking device for a vehicle according to an embodiment of the present disclosure, the groove formed between a plurality of protrusions 531 can be used as a grease (lubricant) bag to form a stable lubricating film when the piston 200 moves, thereby minimizing the frictional resistance of the piston 200.

[0140] Although this disclosure has been described with reference to embodiments shown in the accompanying drawings, the embodiments are for illustrative purposes only, and those skilled in the art will recognize that various modifications and other equivalent embodiments can be derived from the described embodiments.

Claims

1. A braking device for a vehicle, the braking device comprising: The caliper body is equipped with a cylinder; Nut and screw, which are rotatably arranged on the cylinder; A bolt thread that is capable of moving in a first direction or in a second direction opposite to the first direction as the nut thread rotates; A piston, movably arranged in the cylinder and configured to move in the first direction by pressure from the bolt screw, and the piston interfering with the bolt screw to limit the rotation of the bolt screw; and A retainer, which is fastened to the cylinder and configured to interfere with the piston to limit the rotation of the piston.

2. The braking device for a vehicle according to claim 1, wherein, The piston includes: The piston body portion, wherein the bolt is inserted into the piston body portion; A first interference portion, disposed on the inner circumferential surface of the piston body portion and configured to interfere with the bolt thread; and The second interference portion is disposed on the outer peripheral surface of the piston body portion and is configured to interfere with the retainer.

3. The braking device for a vehicle according to claim 2, wherein: The first interference portion is formed to protrude from the inner circumferential surface of the piston body portion, and The second interference portion is formed as a recess on the outer peripheral surface of the piston body portion.

4. The braking device for a vehicle according to claim 3, wherein, The second interference portion extends along the central axis of the piston.

5. The braking device for a vehicle according to claim 2, wherein, The bolt includes: The bolt body is coupled to the nut thread via ball bearings. The bolt head portion is configured to pressurize the piston body portion; and The third interference portion is disposed on the outer peripheral surface of the bolt head portion and is capable of contacting the first interference portion.

6. The braking device for a vehicle according to claim 5, wherein, The third interference portion is formed into a flat surface by removing a portion of the outer peripheral surface of the bolt head portion.

7. The braking device for a vehicle according to claim 2, wherein, The retainer includes: The retainer body portion, which is annular in shape, is disposed between the cylinder and the piston; and The fourth interference portion is disposed on the inner circumferential surface of the holder body portion and is capable of contacting the second interference portion.

8. The braking device for a vehicle according to claim 7, wherein, The fourth interference portion is formed to protrude from the inner peripheral surface of the holder body portion.

9. The braking device for a vehicle according to claim 7, wherein, The retainer also includes a damper portion that is coupled to the retainer body portion and is capable of contacting the piston.

10. The braking device for a vehicle according to claim 9, wherein, The damper portion is further provided with a protrusion mounted on the piston.

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