Braking device for vehicle

Abstract

A braking device for a vehicle may include: a shim unit disposed to face a disc unit; a first caliper body unit fixed to a vehicle body and configured to support the shim unit so that the shim unit is movable; a first pressing unit mounted on the first caliper body unit so as to be movable forward or backward and configured to press the shim unit to apply a main braking force; a second caliper body unit slidably mounted on the first caliper body unit; and a second pressing unit mounted on the first caliper body unit so as to be movable forward or backward and configured to press the shim unit to apply a parking braking force together with the second caliper body unit. According to the present disclosure, the second caliper body unit and the second pressing unit can be used to ensure a parking brake function without requiring separate equipment.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate to a brake apparatus for a vehicle, and more particularly, to a brake apparatus for a vehicle that has a fixed caliper and can simultaneously perform a service brake function and a parking brake function. Background Art

[0002] Generally speaking, a vehicle's braking system uses the hydraulic pressure generated by a master cylinder or the rotational force of an electric motor to push a piston, bringing the brake pads and brake discs into close contact. This friction between the pads and discs is then used to brake the vehicle. Fixed calipers, consisting of a single caliper body, can have multiple pistons inside and outside the caliper, with the brake disc interposed between them, ensuring higher braking force than traditional layouts. Fixed calipers are suitable for mid-size and large SUVs, as well as high-performance sedans and sports cars.

[0003] Because the piston of a fixed caliper in the related art moves while the caliper is fixed, it is difficult to connect a separate electronic parking brake system to it. Therefore, a separate parking brake system is installed separately, or a drum brake is used to ensure the parking brake function. However, this method increases the number of parts, makes product assembly difficult, and incurs significant costs.

[0004] Background art of the present disclosure is disclosed in Korean Patent Application Publication No. 10-2010-0098846 (published on September 10, 2010, entitled “Disc Brake with Parking Function”). Summary of the Invention

[0005] Various embodiments relate to a brake device for a vehicle having a fixed caliper capable of simultaneously performing service brake functions and parking brake functions.

[0006] In one embodiment, a braking device includes: a shim unit, which is arranged to face the disc unit; a first caliper body unit, which is fixed to the vehicle body and is configured to support the shim unit so that the shim unit is movable; a first pressing unit, which is mounted on the first caliper body unit so as to be movable forward or backward and is configured to press the shim unit to apply a main braking force; a second caliper body unit, which is slidably mounted on the first caliper body unit; and a second pressing unit, which is mounted on the first caliper body unit so as to be movable forward or backward and is configured to press the shim unit to apply a parking braking force together with the second caliper body unit.

[0007] The first caliper body unit may include: a first shell and a second shell, which are symmetrically arranged relative to the disc unit; a base portion, which is arranged between the first shell and the second shell and is configured to allow the second caliper body unit to be installed thereon; and a sleeve portion, which extends from the second shell and is configured to support the second caliper body unit so that the second caliper body unit can slide.

[0008] The sleeve portion may extend from the second housing in a direction parallel to the axial direction of the disc unit.

[0009] The second caliper body unit may include: a bridge portion extending in the axial direction of the disc unit; a guide portion extending from one side of the bridge portion and slidably inserted into the sleeve portion; and a finger portion extending from the other side of the bridge portion and arranged to face the shim unit.

[0010] A central axis of the guide portion may be coaxially disposed with a central axis of the second pressing unit and a central axis of the sleeve portion.

[0011] The guide portion may slide by a pressing force applied to the spacer unit by the second pressing unit and bring the finger portion into contact with the spacer unit.

[0012] The braking device may further include a restoring unit disposed between the sleeve portion and the guide portion and configured to move the guide portion to an initial position of the guide portion when the second pressing unit releases the spacer unit.

[0013] The restoring unit may be elastically deformable and in close contact with an outer circumferential surface of the sleeve portion and an inner circumferential surface of the guide portion.

[0014] The center of gravity of the second caliper body unit and the center of gravity of the second pressing unit may be disposed at positions facing the inner circumferential surface of the restoring unit.

[0015] The first pressing unit may include a first piston portion movably inserted into a first cylinder portion recessed in the first housing, and a second piston portion movably inserted into a second cylinder portion recessed in the second housing.

[0016] The first piston portion and the second piston portion can be moved forward or backward, respectively, under the action of hydraulic pressure transmitted to the interior of the first cylinder portion and the interior of the second cylinder portion, respectively.

[0017] The second pressing unit may include: a third piston portion, which is movably inserted into a third cylinder portion, wherein the third cylinder portion is recessed in the second shell; and a driving portion, which is connected to the third piston portion and is configured to generate a driving force to move the third piston portion forward or backward.

[0018] The third piston portion may be spaced apart from the central axis of the disc unit by a distance longer than a distance between the first and second piston portions and the central axis of the disc unit.

[0019] The driving part may include: a power generating part, which is fixed to the second caliper body unit and is configured to generate a rotational force by electric power applied from the outside; and a power transmitting part, which is connected to the power generating part and the third piston part and is configured to convert the rotational motion of the power generating part into the linear motion of the third piston part.

[0020] The power transmitting portion may have a thread formed on an outer circumferential surface thereof, and the power transmitting portion is threadably engaged to an inner circumferential surface of the third piston portion.

[0021] According to the brake apparatus for a vehicle of the present disclosure, it is possible to ensure a parking brake function using the second caliper body unit and the second pressing unit without requiring separate equipment.

[0022] Furthermore, according to the vehicle brake device disclosed herein, a structure that simply inserts the sleeve portion and the guide portion can support the second caliper body unit so that the second caliper body unit is movable relative to the first caliper body unit, and the second caliper body unit directly transmits the reaction force applied to the third piston portion to the guide portion. Therefore, the amount of processing and the number of components can be reduced.

[0023] In addition, according to the brake device for a vehicle disclosed herein, the third piston portion for applying the parking brake force can be installed separately from the first and second piston portions for applying the main braking force. Therefore, the position of the piston can be freely changed according to specifications and usage conditions.

[0024] Furthermore, according to the brake device for a vehicle disclosed herein, the return unit can prevent foreign matter from entering between the sleeve portion and the guide portion, prevent the guide portion from dragging, and absorb vibration applied to the guide portion, thereby ensuring stable performance.

[0025] Furthermore, according to the brake device for a vehicle disclosed herein, the central axis of the guide portion can be coaxially arranged with the central axis of the second pressing unit, thereby preventing the rotational torque from twisting or damaging the second caliper body unit when the guide portion slides. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view schematically illustrating a configuration of a brake device for a vehicle according to an embodiment of the present disclosure.

[0027] Figure 2 To illustrate the braking device for a vehicle according to an embodiment of the present disclosure, Figure 1 The time points shown are perspective views of the configuration at different time points.

[0028] Figure 3 An exploded perspective view schematically illustrating a configuration of a braking device for a vehicle according to an embodiment of the present disclosure.

[0029] Figure 4 A cross-sectional view taken along line AA′ is shown for explaining the configuration of a braking device for a vehicle according to an embodiment of the present disclosure.

[0030] Figure 5 A cross-sectional view taken along line BB' is shown for explaining the configuration of a braking device for a vehicle according to an embodiment of the present disclosure.

[0031] Figure 6 It is a front view schematically illustrating the configuration of a first housing according to an embodiment of the present disclosure.

[0032] Figure 7 It is a front view schematically illustrating the configuration of the second housing according to an embodiment of the present disclosure.

[0033] Figure 8 It is a perspective view schematically illustrating the configuration of a second caliper body unit according to an embodiment of the present disclosure.

[0034] Figure 9 It is an enlarged view schematically illustrating the configuration of a recovery unit according to an embodiment of the present disclosure.

[0035] Figure 10 and 11 The diagram schematically illustrates an operation process of applying a main braking force by a braking device for a vehicle according to an embodiment of the present disclosure.

[0036] Figure 12 and 13 The diagram schematically illustrates an operation process of applying a parking brake force by a braking device for a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Hereinafter, a braking device for a vehicle will be described through various embodiments with reference to the accompanying drawings.

[0038] Here, for clarity and convenience of description, the thickness of lines, the sizes of components, etc. shown in the drawings may be exaggerated. In addition, the terms used below are defined in consideration of their functions in this disclosure and may vary depending on the intention of the user or operator or common practice. Therefore, such terms should be defined in accordance with the entire content of this specification.

[0039] In addition, in this specification, when an element is referred to as being "connected (or coupled) to" another element, these elements may be "directly connected (coupled) to" each other or "indirectly connected (coupled) to" each other with other elements interposed therebetween. Furthermore, unless expressly described to the contrary, the term "comprise (or include)" and variations such as "comprises (or includes)" or "comprising (or including)" will be understood to imply further inclusion of the elements described, rather than exclusion of the elements described.

[0040] In addition, throughout the specification, the same reference numerals represent the same components. Even if the same or similar reference numerals are not mentioned or described with reference to a specific figure, the same or similar reference numerals may be described with reference to other figures. In addition, even if components are not denoted by reference numerals in a specific figure, those components may be described with reference to other figures. In addition, the numbers, shapes, sizes, relative differences in sizes, etc. of the detailed components shown in the drawings of this application are provided for ease of understanding, do not limit this embodiment, and may be implemented differently.

[0041] Figure 1 A perspective view schematically illustrating a configuration of a braking device for a vehicle according to an embodiment of the present disclosure is shown. Figure 2 To illustrate the braking device for a vehicle according to an embodiment of the present disclosure, Figure 1 The perspective diagrams of the configurations at different points in time are shown in the figure. Figure 3 1 is an exploded perspective view schematically illustrating a configuration of a braking device for a vehicle according to an embodiment of the present disclosure. Figure 4 A cross-sectional view taken along line AA' for explaining the configuration of a braking device for a vehicle according to an embodiment of the present disclosure, and Figure 5 A cross-sectional view taken along line BB' is shown for explaining the configuration of a braking device for a vehicle according to an embodiment of the present disclosure.

[0042] Reference Figures 1 to 6 , a brake device 1 for a vehicle according to an embodiment of the present disclosure includes a shim unit 100 , a first caliper body unit 200 , a first pressing unit 300 , a second caliper body unit 400 , a second pressing unit 500 , and a restoring unit 600 .

[0043] The shim unit 100 is provided to face the disc unit 10 that rotates together with the wheel of the vehicle. The shim unit 100 according to the embodiment of the present disclosure includes a first shim portion 110 and a second shim portion 120.

[0044] The first and second shim portions 110, 120 are symmetrically arranged with the disc unit 10 interposed therebetween. That is, the first and second shim portions 110, 120 are spaced apart from each other by a predetermined interval in the axial direction of the disc unit 10 and have inner surfaces that face opposite surfaces of the disc unit 10. The first and second shim portions 110, 120 are supported on the first caliper body unit 200 (to be described below) so as to be slidable in a direction parallel to the axial direction of the disc unit 10. The first and second shim portions 110, 120 come into contact with or are separated from the disc unit 10. A friction pad made of a material having a high coefficient of friction, such as rubber, may be attached to each inner surface of the first and second shim portions 110, 120 that faces the disc unit 10.

[0045] Under the action of the pressing force applied by the first pressing unit 300 or the second pressing unit 500 (to be described below), the first gasket portion 110 and the second gasket portion 120 make contact with or separate from the disc unit 10 while reciprocating in a direction parallel to the axial direction of the disc unit 10. When the first gasket portion 110 and the second gasket portion 120 make contact with the disc unit 10, the first gasket portion 110 and the second gasket portion 120 apply a braking force to the vehicle while interfering with the rotation of the disc unit 10. When the first gasket portion 110 and the second gasket portion 120 are separated from the disc unit 10, the first gasket portion 110 and the second gasket portion 120 allow the rotation of the disc unit 10, thereby releasing the braking force applied to the vehicle. The specific shapes of the first gasket portion 110 and the second gasket portion 120 are not limited to Figure 3 The shape shown is not limited to the shape shown, and the design can be variously changed within the technical spirit of the brake pad that contacts the disc unit 10.

[0046] The first caliper body unit 200 is fixed to the vehicle body and supports the shim unit 100 so that the shim unit 100 is movable in a direction parallel to the axial direction of the disc unit 10. The first caliper body unit 200 defines a space in which the first pressing unit 300, the second caliper body unit 400, the second pressing unit 500, and the restoring unit 600 can be installed.

[0047] The first caliper body unit 200 according to an embodiment of the present disclosure includes a first housing 210 , a second housing 220 , a support portion 230 , a base portion 240 , and a sleeve portion 250 .

[0048] The first housing 210 and the second housing 220 define the appearance of two opposite sides of the first caliper body unit 200. The first housing 210 and the second housing 220 are symmetrically arranged with respect to the disc unit 10. That is, the first housing 210 and the second housing 220 face each other and are spaced apart from each other at a predetermined interval in the axial direction of the disc unit 10, with the disc unit 10 and the spacer unit 100 interposed therebetween.

[0049] Figure 6 It is a front view schematically illustrating the configuration of a first housing according to an embodiment of the present disclosure.

[0050] Reference Figure 3 and 6 The longitudinal direction of the first housing 210 according to the embodiment of the present disclosure extends in the circumferential direction of the disc unit 10. Therefore, the first housing 210 may have an approximately arc shape. The inner surface of the first housing 210 faces the outer surface of the first gasket portion 110.

[0051] The first housing 210 has a first cylinder portion 211 that supports the first piston portion 310 (described below) of the first pressing unit 300 so that the first piston portion 310 is movable. The first cylinder portion 211 according to an embodiment of the present disclosure can be provided in the form of a chamber that is recessed into the first housing 210 from the inner surface of the first housing 210 facing the first gasket portion 110. The longitudinal direction of the first cylinder portion 211 is parallel to the axial direction of the disc unit 10. The first cylinder portion 211 is provided in plurality, and the plurality of first cylinder portions 211 can be provided spaced apart from each other at predetermined intervals in the longitudinal direction of the first housing 210. The interior of the first cylinder portion 211 is filled with brake fluid. The first cylinder portion 211 can form hydraulic pressure therein by the brake fluid.

[0052] Figure 7 It is a front view schematically illustrating the configuration of the second housing according to an embodiment of the present disclosure.

[0053] Reference Figure 3 and 7 The longitudinal direction of the second housing 220 according to the embodiment of the present disclosure extends in the circumferential direction of the disc unit 10. Therefore, the second housing 220 may have an approximately arc shape. The inner surface of the second housing 220 faces the outer surface of the second gasket portion 120.

[0054] The second housing 220 has a second cylinder portion 221, which supports the second piston portion 320 of the first pressing unit 300 so that the second piston portion 320 is movable. The second cylinder portion 221 according to an embodiment of the present disclosure can be provided in the form of a chamber in which the chamber is recessed into the second housing 220 from the inner surface of the second housing 220 facing the second gasket portion 120. The longitudinal direction of the second cylinder portion 221 is parallel to the axial direction of the disc unit 10. The second cylinder portion 221 is provided in plurality, and the plurality of second cylinder portions 221 can be provided so as to be spaced apart from each other at a predetermined interval in the longitudinal direction of the second housing 220. The interior of the second cylinder portion 221 is filled with brake fluid. The second cylinder portion 221 can form hydraulic pressure therein by the brake fluid.

[0055] Either the first cylinder section 211 or the second cylinder section 221 may have a hydraulic port (not shown) through which brake fluid is received from the outside or discharged to the outside. In this case, the first cylinder section 211 and the second cylinder section 221 may communicate with each other via a separate transfer channel (not shown). As a result, the hydraulic pressure formed in the first cylinder section 211 and the hydraulic pressure formed in the second cylinder section 221 can be synchronized with each other.

[0056] The second housing 220 includes a third cylinder portion 222 that supports the third piston portion 510 of the second pressing unit 500 so that the third piston portion 510 is movable. The third cylinder portion 222 according to an embodiment of the present disclosure may be provided in the form of a chamber that is recessed into the second housing 220 from the inner surface of the second housing 220 that faces the second gasket portion 120. The longitudinal direction of the third cylinder portion 222 is parallel to the axial direction of the disc unit 10. When a pair of second cylinder portions 221 are provided, the third cylinder portion 222 may be provided between the pair of second cylinder portions 221.

[0057] The third cylinder portion 222 can be positioned relatively higher than the second cylinder portion 221. That is, the distance between the third cylinder portion 222 and the central axis of the disc unit 10 can be longer than the distance between the second cylinder portion 221 and the central axis of the disc unit 10. Therefore, when the pad unit 100 and the disc unit 10 are brought into contact with each other via the second pressing unit 500 (described below), the third cylinder portion 222 increases the effective radius within which braking force is applied, thereby improving parking brake efficiency.

[0058] The second housing 220 has a fixing portion 223 that is fixed to the vehicle body and configured to support the entire first caliper body unit 200. The fixing portion 223 according to an embodiment of the present disclosure may be provided in the form of a bracket extending vertically from the lower end of the second housing 220. The fixing portion 223 may be detachably fixed to the vehicle body using bolts or the like. A pair of fixing portions 223 may be provided, and the pair of fixing portions 223 may be provided on two opposing sides of the second housing 220 and spaced apart from each other by a predetermined distance.

[0059] The support portion 230 is installed between the first shell 210 and the second shell 220, and supports the gasket unit 100 so that the gasket unit 100 is movable. The support portion 230 according to an embodiment of the present disclosure can be provided in the form of a rod, and the two opposite ends of the rod are respectively fixed to the inner surfaces of the first shell 210 and the second shell 220. The support portion 230 is provided in a direction parallel to the axial direction of the disc unit 10. A pair of support portions 230 can be provided, and the pair of support portions 230 are spaced apart from each other at a predetermined interval in the longitudinal direction of the first shell 210 and the second shell 220. The two opposite side surfaces of each of the first gasket portion 110 and the second gasket portion 120 are slidably connected to the pair of support portions 230 by hooks, rings, etc.

[0060] The base portion 240 is disposed between the first housing 210 and the second housing 220 and defines the upper appearance of the first caliper body unit 200. The base portion 240 according to an embodiment of the present disclosure extends in the axial direction of the disc unit 10 and is configured to cover the upper side of the disc unit 10. Two opposing end portions of the base portion 240 are integrally connected to the upper ends of the first housing 210 and the second housing 220, respectively.

[0061] The base portion 240 defines a base recess 241, into which the bridge portion 410 (described below) of the second caliper body unit 400 is mounted. The base recess 241 according to an embodiment of the present disclosure may be provided in the form of a hole that vertically passes through the center portion between the base portions 240 in the radial direction of the disc unit 10. The longitudinal direction of the base recess 241 extends in the axial direction of the disc unit 10. The inner surface of the base recess 241 faces the outer surface of the bridge portion 410.

[0062] The sleeve portion 250 extends from the second housing 220 and supports the second caliper body unit 400 (to be described below) so that the second caliper body unit 400 is slidable. The sleeve portion 250 according to an embodiment of the present disclosure extends from the outer surface of the second housing 220 in a direction parallel to the axial direction of the disc unit 10. The sleeve portion 250 has an empty internal space and is connected to the second cylinder portion 221. The central axis of the sleeve portion 250 is coaxially arranged with the central axis of the third cylinder portion 222. The cross-sectional shape of the sleeve portion 250 can be changed in design to have various shapes, for example, a polygonal or elliptical shape in addition to a circular shape.

[0063] The first pressing unit 300 is mounted on the first caliper body 200 so as to be movable forward or backward. When the first pressing unit 300 moves forward, it presses the shim unit 100 to apply a main braking force. In this case, for example, the main braking force may be a braking force generated when the shim unit 100 contacts the disc unit 10 when the driver operates the brake pedal while the vehicle is traveling.

[0064] The first pressing unit 300 according to an embodiment of the present disclosure may include a first piston part 310 and a second piston part 320 .

[0065] The first piston portion 310 is slidably inserted into the first cylinder portion 211. According to an embodiment of the present disclosure, the first piston portion 310 has a substantially cylindrical shape and is inserted into the first cylinder portion 211. The front end of the first piston portion 310 faces the outer surface of the first gasket portion 110. Under the action of the hydraulic pressure generated in the first cylinder portion 211, the first piston portion 310 moves forward or backward in the longitudinal direction of the first cylinder portion 211 (i.e., a direction parallel to the axial direction of the disc unit 10). When the first piston portion 310 moves forward, the front surface portion of the first piston portion 310 presses the outer surface of the first gasket portion 110 and brings the first gasket portion 110 into contact with the disc unit 10, thereby generating a braking force. The first piston portion 310 can be provided in a plurality. In this case, the plurality of first piston portions 310 can be slidably inserted into the plurality of first cylinder portions 211, respectively. A sealing member may be installed between the outer circumferential surface of the first piston portion 310 and the inner circumferential surface of the first cylinder portion 211 , and the sealing member prevents the brake fluid filling the inside of the first cylinder portion 211 from leaking to the outside.

[0066] The second piston portion 320 is slidably inserted into the second cylinder portion 221. According to an embodiment of the present disclosure, the second piston portion 320 has a substantially cylindrical shape and is inserted into the second cylinder portion 221. The front end of the second piston portion 320 faces the outer surface of the second gasket portion 120. Under the action of the hydraulic pressure generated in the second cylinder portion 221, the second piston portion 320 moves forward or backward in the longitudinal direction of the second cylinder portion 221 (i.e., a direction parallel to the axial direction of the disc unit 10). When the second piston portion 320 moves forward, the front surface portion of the second piston portion 320 presses the outer surface of the second gasket portion 120, causing the second gasket portion 120 to contact the disc unit 10, thereby generating a braking force. The second piston portion 320 can be provided in plurality. In this case, the plurality of second piston portions 320 can be slidably inserted into the plurality of second cylinder portions 221, respectively. A sealing member may be installed between the outer circumferential surface of the second piston portion 320 and the inner circumferential surface of the second cylinder portion 221 , and the sealing member prevents the brake fluid filling the inside of the second cylinder portion 221 from leaking to the outside.

[0067] The second caliper body unit 400 is slidably mounted on the first caliper body unit 200. The second caliper body unit 400 moves relative to the first caliper body unit 200 in response to the forward or rearward movement of a second pressing unit 500 (described below). The second caliper body unit 400 moves sideways and presses the shim unit 100, thereby applying a parking brake force in conjunction with the second pressing unit 500. In this case, the parking brake force can be, for example, the braking force generated when the shim unit 100 contacts the disc unit 10 when the driver operates the parking brake button to park or stop the vehicle.

[0068] Figure 8 It is a perspective view schematically illustrating the configuration of a second caliper body unit according to an embodiment of the present disclosure.

[0069] Reference Figures 1 to 8 The second caliper body unit 400 according to an embodiment of the present disclosure includes a bridging portion 410 , a guide portion 420 , a finger portion 430 , and a flange portion 440 .

[0070] The bridge portion 410 defines the appearance of the central portion of the second caliper body unit 400 and generally supports the guide portion 420, the finger portion 430, and the flange portion 440 (described below). The bridge portion 410 according to an embodiment of the present disclosure can have a shape similar to a rod. The longitudinal direction of the bridge portion 410 is set in a direction parallel to the axial direction of the disc unit 10. The bridge portion 410 is placed in the base groove 241 formed in the central portion between the base portions 240. The two opposing surfaces of the bridge portion 410 face the inner surface of the base groove 241.

[0071] The guide portion 420 extends from one side of the bridge portion 410 and defines the rear appearance of the second caliper body unit 400. The guide portion 420 is slidably inserted into the sleeve portion 250 and guides the sliding of the second caliper body unit 400. The guide portion 420 according to an embodiment of the present disclosure may have a cylindrical shape that is open on one side thereof. The upper end of the guide portion 420 is integrally connected to the lower surface of the rear end of the bridge portion 410. The inner diameter of the guide portion 420 has a size corresponding to the outer diameter of the sleeve portion 250. The sleeve portion 250 is inserted into the guide portion 420 through the open side of the guide portion 420. The inner circumferential surface of the guide portion 420 is in slidable contact with the outer circumferential surface of the sleeve portion 250.

[0072] The guide portion 420 slides in a direction parallel to the axial direction of the disc unit 10 due to a reaction force applied in a direction opposite to the pressing force applied to the shim unit 100 by the second pressing unit 500. The central axis of the guide portion 420 is coaxial with the central axis of the sleeve portion 250 and the central axis of the third piston portion 510 (described below) of the second pressing unit 500. Therefore, the central axis of the sliding movement of the guide portion 420 can coincide with the central axis of the reaction force transmitted from the second pressing unit 500, thereby preventing the second caliper body unit 400 from being distorted or damaged by rotational torque.

[0073] The finger-shaped portion 430 extends from the other side of the bridge member 410 and defines the front appearance of the second caliper body unit 400. The finger-shaped portion 430 presses or releases the shim unit 100 under the sliding action of the guide portion 420. The finger-shaped portion 430 according to an embodiment of the present disclosure can be provided in the form of a rod extending vertically downward from the front end of the bridge portion 410. The finger-shaped portion 430 can be formed integrally with the bridge portion 410 by welding, pressing, bending, etc. The finger-shaped portion 430 passes through the base groove 241, and the inner surface of the finger-shaped portion 430 faces the outer surface of the first shim portion 110. When the guide portion 420 slides, the finger-shaped portion 430 slides together with the guide portion 420 through the bridge portion 410.

[0074] The flange portion 440 extends from the guide portion 420 and defines a space that can support the drive portion 520 (described below). According to an embodiment of the present disclosure, the flange portion 440 can be provided in the form of a circular plate that extends from the rear end outer peripheral surface of the guide portion 420 in the radial direction of the guide portion 420. The flange portion 440 can have a plurality of engagement holes that pass through the flange portion 440 in a direction perpendicular to the axial direction of the disc unit 10. The plurality of engagement holes are spaced apart from each other at predetermined intervals in the circumferential direction of the flange portion 440.

[0075] The second pressing unit 500 is mounted on the first caliper body unit 200 so as to be movable forward or backward. The second pressing unit 500 moves forward and presses the shim unit 100 to guide the sliding of the second caliper body unit 400 and applies parking brake force together with the second caliper body unit 400.

[0076] The second pressing unit 500 according to an embodiment of the present disclosure includes a third piston part 510 and a driving part 520 .

[0077] The third piston portion 510 is slidably inserted into the third cylinder portion 222. According to an embodiment of the present disclosure, the third piston portion 510 has a hollow cylindrical shape and is inserted into the second cylinder portion 221. The front end of the third piston portion 510 faces the outer surface of the second gasket portion 120. The rear end of the third piston portion 510 is open, allowing the power transmission portion 522 (described below) to be inserted into the third piston portion 510. A thread is formed on the inner circumferential surface of the third piston portion 510, and the thread extends in a spiral shape in the longitudinal direction of the third piston portion 510. Under the action of the driving portion 520 (described below), the third piston portion 510 moves forward or backward in the longitudinal direction of the third cylinder portion 222 (i.e., parallel to the axial direction of the disc unit 10). When the third piston portion 510 moves forward, the front surface of the third piston portion 510 partially presses against the outer surface of the second gasket portion 120, causing the second gasket portion 120 to contact the disc unit 10, thereby generating a braking force. The third piston portion 510 is installed so as not to rotate about its central axis. Therefore, the third piston portion 510 can stably move forward or backward by a rotational force transmitted from a driving portion 520 (to be described below).

[0078] The third piston portion 510 can be positioned relatively higher than the first piston portion 310 and the second piston portion 320. In other words, the distance between the third piston portion 510 and the central axis of the disc unit 10 can be longer than the distance between the first piston portion 310 and the second piston portion 320 and the central axis of the disc unit 10. Therefore, when the shim unit 100 and the disc unit 10 contact each other, the third piston portion 510 increases the effective radius of the applied braking force, thereby improving parking brake efficiency.

[0079] The driving portion 520 is connected to the third piston portion 510 , generates a driving force during parking and braking of the vehicle, and moves the third piston portion 510 forward or backward.

[0080] The driving portion according to an embodiment of the present disclosure includes a power generating portion 521 , a power transmitting portion 522 , and a bearing portion 523 .

[0081] The power generating unit 521 is fixed to the second caliper body unit 400 and generates a rotational force by applying electric power from the outside. The power generating unit 521 according to an embodiment of the present disclosure faces the rear surface of the flange portion 440 and is fixed to the flange portion 440 by bolts or the like. The power generating unit 521 may include a speed reducer and an electric motor configured to generate a rotational force by applying electric power from a battery or the like in the vehicle.

[0082] The two opposing sides of the power transmission unit 522 are connected to the power generating unit 521 and the third piston unit 510, respectively. The power transmission unit 522 converts the rotational motion of the power generating unit 521 into linear motion of the third piston unit 510. The power transmission unit 522 according to an embodiment of the present disclosure can be provided in the form of a rod having threads formed on its outer circumferential surface. The power transmission unit 522 is arranged in a direction parallel to the axial direction of the disc unit 10. The central axis of the power transmission unit 522 is coaxial with the central axis of the third cylinder unit 222, the central axis of the guide unit 420, and the central axis of the third piston unit 510. One side of the power transmission unit 522 is connected to the output shaft of the power generating unit 521, and the power transmission unit 522 rotates about its central axis due to the rotational force generated by the power generating unit 521. The other side of the power transmission unit 522 passes through the guide unit 420, is disposed in the third cylinder unit 222, and is threadedly engaged with the inner circumferential surface of the third piston unit 510. Therefore, the power transmission portion 522 may rotate relative to the third piston portion 510 and move the third piston portion 510 forward or backward in a direction parallel to the axial direction of the disc unit 10 .

[0083] The bearing portion 523 is mounted between the guide portion 420 and the power transmission portion 522 and supports the power transmission portion 522 so that it is rotatable relative to the guide portion 420. For example, the bearing portion 523 according to an embodiment of the present disclosure may be a thrust bearing having one side rotatably connected to the power transmission portion 522 so that the bearing portion 523 rotates together with the power transmission portion 522, and the other side fixed to the inner surface of the guide portion 420. Therefore, the bearing portion 523 can prevent the reaction force generated by the contact between the third piston portion 510 and the second gasket portion 120 from separating the power transmission portion 522 from the third cylinder portion 222. Furthermore, the bearing portion 523 can guide the reaction force generated by the contact between the third piston portion 510 and the second gasket portion 120 to be transmitted toward the guide portion 420.

[0084] The restoring unit 600 is provided between the sleeve portion 250 and the guide portion 420, and performs sealing, damping, and drag reduction using the elastic restoring force of the restoring unit 600. More specifically, when the second pressing unit 500 releases the gasket unit 100, the restoring unit 600 moves the guide portion 420 to the initial position of the guide portion 420. In this case, for example, the initial position of the guide portion 420 may represent the position of the guide portion 420 in a state where the finger portion 430 and the first gasket portion 110 are at the maximum spacing before the second pressing unit 500 is operated. For example, the initial position of the guide portion 420 may be Figure 4 The guide portion 420 is shown in FIG. The restoring unit 600 absorbs vibration generated when the guide portion 420 slides. The restoring unit 600 seals the portion between the sleeve portion 250 and the guide portion 420 and prevents infiltration of foreign matter.

[0085] Figure 9 It is an enlarged view schematically illustrating the configuration of a recovery unit according to an embodiment of the present disclosure.

[0086] Reference Figure 9 , the restoring unit 600 according to an embodiment of the present disclosure may be provided in the form of a circular ring. The restoring unit 600 may be made of an elastically deformable material such as rubber or silicone. The inner and outer circumferential surfaces of the restoring unit 600 are in close contact with and fixed to the outer circumferential surface of the sleeve portion 250 and the inner circumferential surface of the guide portion 420, respectively. Figure 9 As shown, the cross-sectional shape of the restoring unit 600 may have a bellows shape or may have a circular shape, a polygonal shape, or the like.

[0087] The center of gravity C of the second caliper body unit 400 and the center of gravity C of the second pressing unit 500 can be positioned on the central axis of the third cylinder portion 222 and the central axis of the guide portion 420, and can be positioned at a position facing the inner circumferential surface of the return unit 600. In this case, the center of gravity C of the second caliper body unit 400 and the center of gravity C of the second pressing unit 500 represent points where no net torque is generated by gravity. Therefore, the return unit 600 can support the sleeve portion 250 and the guide portion 420 on the same plane as the center of gravity C of the second caliper body unit 400 and the center of gravity C of the second pressing unit 500. Therefore, the return unit 600 can maximize the damping performance and prevent the second caliper body unit 400 from rolling to the left or right due to rotational torque.

[0088] Hereinafter, the operation of the brake device 1 for a vehicle according to the embodiment of the present disclosure will be described in detail.

[0089] Figure 10 and 11The diagram schematically illustrates an operation process of applying a main braking force by a braking device for a vehicle according to an embodiment of the present disclosure.

[0090] Reference Figure 10 and 11 When the driver steps on the brake pedal while the vehicle is traveling, the first cylinder portion 211 and the second cylinder portion 221 form hydraulic pressure by the brake fluid introduced therein.

[0091] The first piston portion 310 and the second piston portion 320 are respectively moved forward toward the first gasket portion 110 and the second gasket portion 120 under the action of the hydraulic pressure formed in the first cylinder portion 211 and the second cylinder portion 221 .

[0092] The first and second piston portions 310 and 320 press the first and second gasket portions 110 and 120 toward the disc unit 10 , and the first and second gasket portions 110 and 120 come into contact with the disc unit 10 and generate a braking force.

[0093] Thereafter, when the driver releases the brake pedal, the brake fluid is discharged from the first cylinder portion 211 and the second cylinder portion 221 , and negative pressure is formed in the first cylinder portion 211 and the second cylinder portion 221 .

[0094] ]The first piston portion 310 and the second piston portion 320 release the braking force and simultaneously move backward in a direction away from the first gasket portion 110 and the second gasket portion 120 by the negative pressure.

[0095] Figure 12 and 13 The diagram schematically illustrates an operation process of applying a parking brake force by a braking device for a vehicle according to an embodiment of the present disclosure.

[0096] Reference Figure 12 and 13 When the driver manipulates the parking brake button to park or stop the vehicle, the power generating unit 521 receives a control signal from an electronic control unit (ECU) and the like and generates a rotational force.

[0097] The power transmission portion 522 rotates around the central axis of the power transmission portion 522 under the action of the rotational force generated by the power generation portion 521 .

[0098] The third piston portion 510 threadedly engaged with the power transmission portion 522 moves forward toward the second gasket portion 120 under the action of the rotational movement of the power transmission portion 522 .

[0099] The third piston portion 510 presses the second gasket portion 120 toward the disc unit 10 while moving forward, and brings the second gasket portion 120 into contact with the disc unit 10 .

[0100] A reaction force is applied to the third piston portion 510 in a direction opposite to the pressing force applied by the third piston portion 510 to the second gasket portion 120 .

[0101] The reaction force is transmitted to the guide portion 420 through the third piston portion 510 , the power transmission portion 522 , and the bearing portion 523 in sequence.

[0102] The guide portion 420 slides rearward in the longitudinal direction of the sleeve portion 250 from an initial position of the guide portion 420 .

[0103] The restoring unit 600 accumulates elastic restoring force while being elastically deformed by the sliding of the guide portion 420 .

[0104] Meanwhile, the restoring unit 600 offsets vibration generated when the guide portion 420 slides while being elastically deformed in a direction opposite to the vibration.

[0105] The finger portion 430 slides rearward together with the guide portion 420 and comes into contact with the first gasket portion 110 .

[0106] The first gasket portion 110 comes into contact with the disc unit 10 due to the pressing force applied by the finger portion 430 , and generates a braking force together with the second gasket portion 120 .

[0107] Thereafter, when the driver manipulates the parking brake button to release the parking or stopping state of the vehicle, the driving part 520 operates in a reverse order to the above-described operations and moves the third piston part 510 backward.

[0108] When the third piston portion 510 moves rearward and is separated from the second gasket portion 120 , the pressing force and the reaction force applied to the second gasket portion 120 are eliminated.

[0109] The guide portion 420 returns to its original position while sliding forward in the longitudinal direction of the sleeve portion 250 by the elastic restoring force accumulated by the restoring unit 600 .

[0110] Although exemplary embodiments of the present disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the disclosure as defined in the technical solutions.

Claims

1. A braking device for a vehicle, comprising: a spacer unit disposed to face the disc unit; a first caliper body unit fixed to the vehicle body and configured to support the shim unit so that the shim unit is movable; a first pressing unit mounted on the first caliper body unit so as to be movable forward or backward and configured to press the shim unit to apply a main braking force; a second caliper body unit slidably mounted on the first caliper body unit; and a second pressing unit mounted on the first caliper body unit so as to be movable forward or backward and configured to press the shim unit to apply a parking brake force together with the second caliper body unit; Wherein, the first caliper body unit includes: A first shell and a second shell are symmetrically arranged relative to the disc unit; a base portion provided between the first housing and the second housing and configured to allow the second caliper body unit to be mounted thereon; and A sleeve portion extends from the second housing and is configured to support the second caliper body unit so that the second caliper body unit is slidable.

2. The braking device according to claim 1, wherein: The sleeve portion extends from the second housing in a direction parallel to an axial direction of the disc unit.

3. The braking device according to claim 1, wherein: The second caliper body unit comprises: a bridge portion extending in the axial direction of the disc unit; a guide portion extending from one side of the bridge portion and slidably inserted into the sleeve portion; and A finger portion extends from the other side of the bridge portion and is disposed to face the spacer unit.

4. The braking device according to claim 3, wherein: A central axis of the guide portion is coaxial with a central axis of the second pressing unit and a central axis of the sleeve portion.

5. The braking device according to claim 3, wherein: The guide portion slides by the pressing force applied to the spacer unit by the second pressing unit, and brings the finger portion into contact with the spacer unit.

6. The braking device according to claim 5, further comprising: A restoring unit is provided between the sleeve portion and the guide portion and is configured to move the guide portion to an initial position of the guide portion when the second pressing unit releases the spacer unit.

7. The braking device according to claim 6, wherein: The restoring unit is elastically deformable and is provided in close contact with an outer peripheral surface of the sleeve portion and an inner peripheral surface of the guide portion.

8. The braking device according to claim 6, wherein: The center of gravity of the second caliper body unit and the center of gravity of the second pressing unit are disposed at positions facing an inner peripheral surface of the restoring unit.

9. The braking device according to claim 1, wherein: The first pressing unit includes: a first piston portion movably inserted into a first cylinder portion recessed in the first housing; and The second piston portion is movably inserted into the second cylinder portion, and the second cylinder portion is recessed in the second housing.

10. The braking device according to claim 9, wherein: The first piston portion and the second piston portion are respectively moved forward or backward by hydraulic pressure transmitted to the interior of the first cylinder portion and the interior of the second cylinder portion, respectively.

11. The braking device according to claim 9, wherein: The second pressing unit includes: a third piston portion movably inserted into a third cylinder portion recessed in the second housing; and The driving portion is connected to the third piston portion and is configured to generate a driving force to move the third piston portion forward or backward.

12. The braking device according to claim 11, wherein: The third piston portion is spaced apart from the central axis of the disc unit by a distance longer than the first and second piston portions are spaced apart from the central axis of the disc unit.

13. The braking device according to claim 11, wherein: The driving unit includes: a power generating portion fixed to the second caliper body unit and configured to generate a rotational force by electric power applied from the outside; and The power transmission part is connected to the power generation part and the third piston part, and is configured to convert the rotational motion of the power generation part into the linear motion of the third piston part.

14. The braking device according to claim 13, wherein: The power transmission portion has a thread formed on an outer peripheral surface thereof, and the power transmission portion is threadably engaged to an inner peripheral surface of the third piston portion.

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