Brake apparatus for vehicle

Abstract

The present invention relates to a brake device for a vehicle, characterized by comprising a main body, a parking brake unit movably disposed in the main body and equipped with a guide unit, a guide rod inserted into the guide unit to guide movement in a first direction or movement in a direction opposite to the first direction of the parking brake unit, and a fastening member that penetrates the guide rod and is fastened to the main body.

Description

Technology Field

[0001] The present invention relates to a vehicle brake device, and more specifically, to a vehicle brake device in which a floating type caliper is integrally provided with a fixed type caliper. Background Technology

[0002] Fixed (opposed) calipers are a type in which pistons are positioned on the inner and outer sides of the brake disc. Although the product cost is higher than that of floating calipers, they offer advantages in rigidity, superior braking responsiveness, uniform contact pressure, and an aesthetically pleasing appearance, so they are primarily applied to luxury or high-performance vehicles.

[0003] Generally, when fixed calipers are applied to the rear brake discs of a vehicle, a separate system for parking braking must be added. Recently, to reduce system weight and the number of parts, fixed caliper-integrated Electronic Parking Brakes (EPBs) are being developed, in which the parking function is integrated into the fixed caliper into a single system.

[0004] The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-2024-0051636 (published April 22, 2024; Title of Invention: Brake Device and Brake System and Vehicle). The problem to be solved

[0005] The objective of the present invention is to provide a vehicle brake device that can be configured as an integrated unit by applying a fixed caliper for the main braking and a movable caliper for the parking brake. means of solving the problem

[0006] A vehicle brake device according to the present invention, devised to achieve the above objective, comprises: a main member; a parking brake member movably disposed on the main member and equipped with a guide member; a guide rod inserted into the guide member to guide movement of the parking brake member in a first direction or movement in a direction opposite to the first direction; and a fastening member that penetrates the guide rod and is fastened to the main member.

[0007] It may further include dust boots coupled to the guide portion and positioned on both sides of the guide rod.

[0008] The above main body may include a main body caliper body, a first brake pad movably disposed on a first portion of the main body caliper body and capable of contacting the parking brake part, and a second brake pad movably disposed on a second portion of the main body caliper body facing the first portion and capable of contacting the parking brake part.

[0009] The above main body is provided in the above main body caliper body and may further include a guide pin that guides the movement of the first brake pad and the second brake pad by movably connecting the first brake pad and the second brake pad.

[0010] The above-mentioned main brake caliper body may include a first groove formed concavely in the first portion to expose at least a portion of the first brake pad, and a second groove formed concavely in the second portion to expose at least a portion of the second brake pad.

[0011] The above main brake caliper body may further include a movement limiting part that is provided in the first part and interferes with the parking brake part to restrict movement in a direction opposite to the first direction of the parking brake part.

[0012] The above parking brake unit may include a parking caliper body having a parking cylinder positioned facing the second brake pad, a parking piston movably positioned in the parking cylinder and capable of contacting the second brake pad, a driving unit coupled to the parking caliper body and generating rotational force, and a power transmission member rotatably positioned in the parking cylinder and receiving the rotational force of the driving unit to move the parking piston.

[0013] The above parking piston is coupled with the power transmission member and can be moved in conjunction with the rotation of the power transmission member in the first direction or in a direction opposite to the first direction.

[0014] The above parking piston can be moved in a direction opposite to the above first direction to press the above second brake pad.

[0015] The above parking brake unit may include a finger that extends from the parking caliper body, is positioned facing the first brake pad, and presses the first brake pad as the parking caliper body moves in the first direction. Effects of the invention

[0016] The present invention has the effect of enabling the implementation of an EPB (Electronic Parking Brake) in which the main braking uses a fixed caliper method to enhance braking performance, while the parking braking is driven by a movable caliper method.

[0017] The present invention has the effect of utilizing the main brake caliper body as a torque member of the parking caliper body during parking braking.

[0018] The present invention has the effect of improving durability and dynamic braking performance by securing a stable center of gravity and increasing the behavioral stability of the parking caliper body by connecting the main brake caliper body and the parking caliper body in a manner that changes from the existing CL (Collette) type guide rod to a CR (Collette Reverse) type guide rod. Brief explanation of the drawing

[0019] FIG. 1 is a perspective view of a vehicle brake device according to an embodiment of the present invention, viewed from above. FIG. 2 is a perspective view of the vehicle brake device of FIG. 1 viewed from below. FIG. 3 is a perspective view of the main body of a vehicle brake device according to an embodiment of the present invention, viewed from above. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a cross-sectional view taken along line V-V of FIG. 1, FIG. 6 is an exploded perspective view showing a vehicle brake device according to an embodiment of the present invention. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 1, FIG. 8 is a cross-sectional view showing the operating state of a vehicle brake device according to an embodiment of the present invention. Specific details for implementing the invention

[0020] Hereinafter, an embodiment of a vehicle brake device according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0022] FIG. 1 is a perspective view of a vehicle brake device according to an embodiment of the present invention viewed from the top, FIG. 2 is a perspective view of the vehicle brake device of FIG. 1 viewed from the bottom, FIG. 3 is a perspective view of the main body of the vehicle brake device according to an embodiment of the present invention viewed from the top, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3.

[0023] Referring to FIGS. 1 to 4, a vehicle brake device according to an embodiment of the present invention includes a main braking unit (100), a parking braking unit (200), a guide rod (300), and a fastening member (400), which are described in detail as follows.

[0024] The first direction described below may refer to the direction in which the X-axis is directed relative to FIG. 1, the second direction may refer to the direction in which the Y-axis is directed relative to FIG. 1, and the third direction may refer to the direction in which the Z-axis is directed relative to FIG. 1.

[0025] The main body (100) according to the present embodiment may include a main body caliper body (110), a first brake pad (120), and a second brake pad (130).

[0026] The main drive caliper body (110) forms the general outline of the main drive unit (100) and can support the first brake pad (120) and the second brake pad (130) in their entirety. The main drive caliper body (110) can be fixed to the knuckle (not shown) of a vehicle, etc.

[0027] A main fluid caliper body (110) according to the present embodiment may be provided with a main fluid cylinder (101). The main fluid cylinder (101) may be provided inside the main fluid caliper body (110). The main fluid cylinder (101) may be formed in a hollow shape with one side open. The main fluid cylinder (101) may include a first cylinder (101a) and a second cylinder (101b).

[0028] The main brake caliper body (110) according to the present embodiment may include a first portion (100a), a second portion (100b), and a connecting portion (100c).

[0029] A first cylinder (101a) may be provided in the first portion (100a). The open side of the first cylinder (101a) may be positioned to face the first brake pad (120). A plurality of first cylinders (101a) may be provided. A plurality of first cylinders (101a) may be spaced apart along a direction parallel to the second direction.

[0030] The second portion (100b) may be positioned facing the first portion (100a). The first portion (100a) and the second portion (100b) may be positioned spaced apart along a direction parallel to the first direction.

[0031] A second cylinder (101b) may be provided in the second portion (100b). The open side of the second cylinder (101b) may be positioned to face the second brake pad (130). Multiple second cylinders (101b) may be provided. Multiple second cylinders (101b) may be spaced apart along a direction parallel to the second direction.

[0032] The first brake pad (120) may be movably disposed in the first portion (100a), and the second brake pad (130) may be movably disposed in the second portion (100b). The first brake pad (120) and the second brake pad (130) may come into contact with the parking brake portion (200).

[0033] A first brake pad (120) and a second brake pad (130) may be disposed between the first portion (100a) and the second portion (100b). The first brake pad (120) and the second brake pad (130) may be disposed facing each other with the brake disc (10) in between.

[0034] A first brake pad (120) facing a first cylinder (101a) may be spaced apart from the brake disc (10) along a direction opposite to the first direction, and a second brake pad (130) facing a second cylinder (101b) may be spaced apart from the brake disc (10) along the first direction.

[0035] A friction pad containing a material with a high coefficient of friction, such as rubber, may be attached to one side of the first brake pad (120) and the second brake pad (130) facing the brake disc (10).

[0036] A main drive piston (102) may be accommodated inside the main drive cylinder (101) according to the present embodiment. The main drive piston (102) may include a first piston (102a) and a second piston (102b).

[0037] The first piston (102a) may be movably installed in the first cylinder (101a). The first piston (102a) may be positioned inside the first cylinder (101a). The first piston (102a) may reciprocate linearly along the axial direction of the first cylinder (101a) parallel to the first direction.

[0038] The outer surface of the first piston (102a) may be slidably supported on the inner surface of the first cylinder (101a). Alternatively, the outer surface of the first piston (102a) may be spaced apart from the inner surface of the first cylinder (101a) by a set distance to form a gap.

[0039] As the first piston (102a) moves outward from the first cylinder (101a), it can protrude from the first cylinder (101a) and press the first brake pad (120), which is positioned facing the first cylinder (101a), toward the brake disc (10). That is, as the first piston (102a) moves in the first direction, it can press the first brake pad (120), which is positioned facing the first cylinder (101a), toward the first direction.

[0040] The second piston (102b) may be movably installed in the second cylinder (101b). The second piston (102b) may be positioned inside the second cylinder (101b). The second piston (102b) may reciprocate linearly along the axial direction of the second cylinder (101b) parallel to the first direction. The second piston (102b) may move together with the first piston (102a) in opposite directions.

[0041] The outer surface of the second piston (102b) may be slidably supported on the inner surface of the second cylinder (101b). Alternatively, the outer surface of the second piston (102b) may be spaced apart from the inner surface of the second cylinder (101b) by a set distance to form a gap.

[0042] As the second piston (102b) moves outward from the second cylinder (101b), it can protrude from the second cylinder (101b) and press the second brake pad (130), which is positioned facing the second cylinder (101b), toward the brake disc (10). That is, as the second piston (102b) moves in a direction opposite to the first direction, it can press the second brake pad (130), which is positioned facing the second cylinder (101b), toward the direction opposite to the first direction.

[0043] The main body (100) according to the present embodiment may further include a guide pin (140).

[0044] A guide pin (140) may be provided in the main fluid caliper body (110). The guide pin (140) may penetrate the first brake pad (120) and the second brake pad (130) in a direction parallel to the first direction and be coupled to the first portion (100a) and the second portion (100b) of the main fluid caliper body (110).

[0045] The guide pins (140) may be provided in multiple numbers. The multiple guide pins (140) may be spaced apart along a direction parallel to the second direction.

[0046] The first brake pad (120) and the second brake pad (130) can be movably coupled to the guide pin (140). The first brake pad (120) and the second brake pad (130) can be supported on the guide pin (140) so as to be slidably moved in a direction parallel to the first direction. The guide pin (140) can guide the first brake pad (120) and the second brake pad (130) to move in the first direction or to move in a direction opposite to the first direction.

[0047] The main body (100) according to the present embodiment may include a first groove (150) and a second groove (160).

[0048] The first groove (150) may be provided in the first portion (100a) of the main fluid caliper body (110). The first groove (150) may be formed concavely from the upper surface (based on FIG. 3) of the first portion (100a) toward the lower portion (100a).

[0049] At least a portion of the first brake pad (120) may be exposed due to a first groove (150) formed concavely in the first portion (100a) of the main brake caliper body (110). Through the first groove (150), the first brake pad (120) may come into contact with the parking brake portion (200) and be pressed by the parking brake portion (200).

[0050] The second groove (160) may be provided in the second portion (100b) of the main fluid caliper body (110). The second groove (160) may be formed concavely from the upper surface (based on FIG. 3) of the second portion (100b) toward the lower portion (100b).

[0051] At least a portion of the second brake pad (130) may be exposed due to a second groove (160) formed concavely in the second portion (100b) of the main brake caliper body (110). Through the second groove (160), the second brake pad (130) may come into contact with the parking brake portion (200) and be pressed by the parking brake portion (200).

[0052] The main body (100) according to the present embodiment may further include a movement restriction part (170).

[0053] The movement limiting part (170) may be provided in the first portion (100a) of the main fluid caliper body (110). The movement limiting part (170) may protrude upward from the outer edge of the first groove portion (150) to the first portion (100a).

[0054] The movement limiting member (170) may be positioned facing the first brake pad (120) along a direction parallel to the first direction. The movement limiting member (170) may be positioned spaced apart along a direction parallel to the first brake pad (120) and the first direction.

[0055] The movement restriction unit (170) can restrict the movement of the parking brake unit (200). The movement restriction unit (170) can interfere with the parking brake unit (200) and restrict movement in a direction opposite to the first direction of the parking brake unit (200).

[0056] The parking brake unit (200) may be movably positioned on the main unit (100). The parking brake unit (200) may be movably coupled to the main unit (100) in a first direction or in a direction opposite to the first direction. The parking brake unit (200) may be provided with a guide unit (201).

[0057] FIG. 5 is a cross-sectional view taken along line V-V of FIG. 1, and FIG. 6 is an exploded perspective view showing a vehicle brake device according to an embodiment of the present invention.

[0058] Referring to FIGS. 1 to 6, the parking braking unit (200) according to the present embodiment may include a parking caliper body (210), a parking piston (230), a driving unit (240), and a power transmission member (250).

[0059] The parking caliper body (210) forms the general outline of the parking brake unit (200) and can support the parking piston (230), the driving unit (240), and the power transmission member (250) in its entirety.

[0060] The lower surface of the parking caliper body (210) (see FIG. 5) may be positioned to face the periphery of the brake disc (10) at a set distance. Both sides of the parking caliper body (210) may extend along the first direction and the direction opposite to the first direction, respectively, with respect to the brake disc (10).

[0061] A first brake pad (120) and a second brake pad (130) may be positioned on the lower side (see FIG. 5) of the parking caliper body (210). The first brake pad (120) and the second brake pad (130) may be spaced apart from each other along the center axis of the brake disc (10). The first brake pad (120) and the second brake pad (130) may be positioned to face each other with the brake disc (10) in between.

[0062] A guide portion (201) may be provided in the parking caliper body (210) according to the present embodiment.

[0063] The guide portion (201) may be positioned on both sides of the parking caliper body (210) parallel to the second direction. The guide portion (201) may be formed as a hollow cylinder and may be formed to have a shape that extends along a direction parallel to the first direction.

[0064] The parking caliper body (210) according to the present embodiment may be equipped with a parking cylinder (211).

[0065] The parking cylinder (211) may extend downward from one side (right side in FIG. 5) of the parking caliper body (210). The parking cylinder (211) may be seated on the second groove (160).

[0066] The parking cylinder (211) may be formed in the shape of a cylinder with a hollow interior and one side open. The open side of the parking cylinder (211) may be positioned to face the second brake pad (130).

[0067] The open side of the parking cylinder (211) may be positioned to face a second brake pad (130) spaced apart in a first direction from the brake disc (10). The open side of the parking cylinder (211) may be spaced apart at a set distance from the second brake pad (130) spaced apart in a first direction from the brake disc (10).

[0068] The central axis of the parking cylinder (211) may be positioned parallel to the central axis of the brake disc (10). The central axis of the parking cylinder (211) may be spaced apart from the central axis of the brake disc (10) along a third direction.

[0069] The parking piston (230) can be movably positioned in the parking cylinder (211). The parking piston (230) can come into contact with the second brake pad (130).

[0070] The parking piston (230) may be installed in the parking cylinder (211) so as to be movable in a first direction or in a direction opposite to the first direction. The parking piston (230) may be positioned inside the parking cylinder (211).

[0071] The parking piston (230) may be formed in a hollow shape with one side open. The closed side of the parking piston (230) may be positioned to face the second brake pad (130) which is positioned to face the parking cylinder (211).

[0072] The open side of the parking piston (230) may be positioned to face the internal space of the parking cylinder (211). The outer surface of the parking piston (230) may be slidably supported on the inner surface of the parking cylinder (211). Alternatively, the outer surface of the parking piston (230) may be spaced apart from the inner surface of the parking cylinder (211) by a set distance to form a gap.

[0073] As the parking piston (230) moves in a direction opposite to the first direction, it protrudes outward from the parking cylinder (211) and can press the second brake pad (130), which is positioned facing the parking cylinder (211), toward the brake disc (10).

[0074] The driving unit (240) is coupled to the parking caliper body (210) and can generate rotational force. The driving unit (240) according to the present embodiment may include a motor (241) and a power transmission means (242).

[0075] The motor (241) can be exemplified by various types of electric motors capable of generating rotational force by receiving power from a vehicle battery (not shown), etc.

[0076] The power transmission means (242) can transmit the rotational force of the motor (241) to the power transmission member (250). The power transmission means (242) may include a plurality of gears that are sequentially engaged and coupled between the motor (241) and the power transmission member (250). However, the power transmission means (242) is not limited to such a configuration, and the design can be modified to various types of power transmission means (242) capable of receiving rotational force from the motor (241) and rotating the power transmission member (250).

[0077] The power transmission member (250) is rotatably disposed in the parking cylinder (211) and can be connected to the parking piston (230). The power transmission member (250) can be connected to a power transmission means (242) that receives rotational force from the motor (241). The power transmission member (250) can transmit the rotational force of the driving unit (240) to the parking piston (230).

[0078] When the driving unit (240) is operated, the power transmission member (250) receives rotational force generated from the motor (241) through the power transmission means (242) and can be rotated clockwise or counterclockwise around a central axis parallel to the first direction.

[0079] The power transmission member (250) may be disposed inside the parking piston (230). The power transmission member (250) may receive rotational force from the driving unit (240) and move the parking piston (230) in a first direction or in a direction opposite to the first direction. The power transmission member (250) may be exemplified by a ball screw, etc., that converts the rotational motion of the driving unit (240) into linear motion of the parking piston (230).

[0080] The parking piston (230) according to the present embodiment is spirally coupled with the power transmission member (250) and can be moved in conjunction with the rotation of the power transmission member (250) in a first direction or in a direction opposite to the first direction. The parking piston (230) can be moved in a direction opposite to the first direction to press the second brake pad (130).

[0081] The parking braking unit (200) according to the present embodiment may further include a finger (220).

[0082] The finger (220) may extend downward from the other side (left side in FIG. 5) of the parking caliper body (210). The finger (220) is positioned to face the first brake pad (120) and can press the first brake pad (120) as the parking caliper body (210) moves in the first direction.

[0083] The finger (220) is positioned between the movement limiting portion (170) and the first brake pad (120) and can be seated on the first groove portion (150). The finger (220) can be positioned to face the first brake pad (120), which is spaced apart from the brake disc (10) in a direction opposite to the first direction.

[0084] The finger (220) can press the first brake pad (120), which is spaced apart from the brake disc (10) in a direction opposite to the first direction, toward the brake disc (10) when the parking caliper body (210) moves along the first direction.

[0085] Figure 7 is a cross-sectional view taken along line VII-VII of Figure 1.

[0086] Referring to FIGS. 1 to 7, the guide rod (300) is inserted into the guide section (201) to guide the movement of the parking brake section (200).

[0087] The guide rod (300) may be formed as a hollow cylinder and may be formed to extend along a direction parallel to the first direction. The guide rod (300) is inserted into the guide portion (201) and can guide the movement of the parking brake portion (200) in the first direction or in a direction opposite to the first direction. That is, the parking caliper body (210) can slide along the axial direction of the guide rod (300) parallel to the first direction.

[0088] The fastening member (400) can be fastened to the main fluid portion (100) by penetrating the guide rod (300). The fastening member (400) can be coupled to the main fluid caliper body (110) by penetrating the interior of the guide rod (300) in a direction parallel to the first direction. As a result, the main fluid caliper body (210) can be supported by the main fluid caliper body (110). The fastening member (400) can be exemplified by a bolt, etc.

[0089] The vehicle brake device according to the present embodiment may further include a dust boot (500).

[0090] The dust boot (500) is coupled to the guide portion (201) and can be positioned on both sides of the guide rod (300) parallel to the first direction. The dust boot (500) may include a material such as elastically deformable rubber, silicone, or plastic.

[0091] The dust boot (500) prevents external foreign matter from entering the interior of the guide section (201) and can seal the interior of the guide section (201). The dust boot (500) can prevent rattle noise when the parking caliper body (210) moves.

[0092] FIG. 8 is a cross-sectional view showing the operating state of a vehicle brake device according to an embodiment of the present invention.

[0093] Referring to FIG. 8, when the driving unit (240) is operated, the rotational force generated from the motor (241) is transmitted through the power transmission means (524) to the power transmission member (250) positioned inside the parking cylinder (211), and when the power transmission member (250) is rotated axially, the parking piston (230), which is movably coupled to the power transmission member (250), moves in a direction opposite to the first direction inside the parking cylinder (211) to press the second brake pad (130).

[0094] As the parking piston (230) moves in a direction opposite to the first direction, the second brake pad (130), which is positioned facing the parking piston (230), moves in a direction opposite to the first direction by the pressure of the parking piston (230) and comes into contact with the brake disc (10), and the parking caliper body (210) can be guided by the guide rod (300) and moved in the first direction by the reaction force generated between the parking piston (230) and the second brake pad (130).

[0095] As the parking caliper body (210) moves in the first direction, the finger (220) positioned facing the first brake pad (120) presses the first brake pad (120) in the first direction so that the first brake pad (120) can come into contact with the brake disc (10).

[0096] A vehicle brake device according to an embodiment of the present invention can implement an EPB (Electronic Parking Brake) in which the main braking is driven by a fixed caliper method to enhance braking performance, while the parking braking is driven by a movable caliper method.

[0097] A vehicle brake device according to an embodiment of the present invention can utilize the main brake caliper body (110) as a torque member of the parking caliper body (210) during parking braking.

[0098] A vehicle brake device according to an embodiment of the present invention can improve durability and dynamic braking performance by increasing the behavioral stability of the parking caliper body (210) through securing a stable center of gravity by connecting the main brake caliper body (110) and the parking caliper body (210) in a manner that changes from a conventional CL (Collette) type guide rod (300) to a CR (Collette Reverse) type guide rod (300).

[0100] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the claims below. Explanation of the symbols

[0101] 10: Brake disc 100: Eastern Joseon 110: Jujedong caliper body 100a: First part 100b: Second part 120: 1st brake pad 130: Second brake pad 140: Guide pin 150: 1st Home 160: 2nd Home 170: Movement Restriction Unit 200: Parking brake unit 201: Guide Department 210: Parking caliper body 211: Parking cylinder 220: Finger 230: Parking Piston 240: Drive unit 250: Power transmission member 300: Guide rod 400: Fastening member 500: Dustboot

Claims

Claim 1 A vehicle brake device comprising: a main body; a parking brake unit movably disposed in the main body and equipped with a guide unit; a guide rod inserted into the guide unit to guide movement in a first direction or movement in a direction opposite to the first direction of the parking brake unit; and a fastening member that penetrates the guide rod and is fastened to the main body. Claim 2 A vehicle brake device according to claim 1, further comprising a dust boot coupled to the guide portion and disposed on both sides of the guide rod. Claim 3 A vehicle brake device according to claim 1, wherein the main brake unit comprises: a main brake caliper body; a first brake pad movably disposed on a first portion of the main brake caliper body and capable of contacting the parking brake unit; and a second brake pad movably disposed on a second portion of the main brake caliper body facing the first portion and capable of contacting the parking brake unit. Claim 4 A vehicle brake device according to claim 3, wherein the main body further comprises a guide pin provided in the main body caliper body and movably coupled to the first brake pad and the second brake pad to guide the movement of the first brake pad and the second brake pad. Claim 5 A vehicle brake device according to claim 3, wherein the main drive caliper body comprises: a first groove formed concavely in the first portion to expose at least a portion of the first brake pad; and a second groove formed concavely in the second portion to expose at least a portion of the second brake pad. Claim 6 A vehicle brake device according to claim 5, wherein the main brake caliper body further comprises a movement limiting part provided in the first part and interfering with the parking brake part to limit movement in a direction opposite to the first direction of the parking brake part. Claim 7 A vehicle brake device according to claim 3, wherein the parking brake unit comprises: a parking caliper body having a parking cylinder positioned facing the second brake pad; a parking piston movably positioned in the parking cylinder and capable of contacting the second brake pad; a driving unit coupled to the parking caliper body and generating rotational force; and a power transmission member rotatably positioned in the parking cylinder and receiving rotational force from the driving unit to move the parking piston. Claim 8 A vehicle brake device according to claim 7, wherein the parking piston is coupled to the power transmission member and moves in conjunction with the rotation of the power transmission member in the first direction or in a direction opposite to the first direction. Claim 9 A vehicle brake device according to claim 8, characterized in that the parking piston moves in a direction opposite to the first direction to press the second brake pad. Claim 10 A vehicle brake device according to claim 7, wherein the parking brake unit comprises a finger that extends from the parking caliper body, is positioned facing the first brake pad, and presses the first brake pad as the parking caliper body moves in the first direction.

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