Braking device for a vehicle

Abstract

A brake device for a vehicle can include a driving portion configured to generate a driving force, a pair of pressing portions configured to receive the driving force from the driving portion and apply or release a braking force, a load transmission portion installed between the pair of pressing portions and configured to transmit a pressing load of any one of the pair of pressing portions to the other pressing portion, and a load transmission limiting portion configured to selectively limit an operation of the load transmission portion through the pressing load transmission portion. According to the present disclosure, a pair of piston portions can be quickly separated from a brake pad, and drag caused by incomplete release of the piston portions can be prevented.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a brake device for a vehicle, and more particularly, to a brake device for a vehicle having a pair of pistons. BACKGROUND

[0002] Generally, a parking brake for a vehicle includes a motor and a power transmission device for operating a friction pad mounted on a caliper of a disc brake device during parking.

[0003] Recently, a parking brake for a vehicle has been applied, which is structured to press a disc using a pair of left and right pistons. In this case, a method of transmitting loads of the left and right pistons using a balance gear is used to solve a problem of a decrease in braking performance due to uneven load transmission to the left and right pistons. For example, when a load is first applied to the left piston, the right ring gear is rotated by the balance gear to synchronize the load values of the left and right pistons, which can allow the left and right pistons to press the pad with the load at the same time.

[0004] However, when the brake is disengaged, the piston having a low load is first released, and then the piston having a high load is released by the balance function. Therefore, since the release time is limited, the piston having a high load is sometimes incompletely released. The incomplete release of the piston can generate drag due to a residual load.

[0005] The background technology of the present disclosure is disclosed in Korean Patent Application No. 10-2010-0098846 (published on September 10, 2010, entitled "Disc brake having a parking function"). SUMMARY

[0006] An object of the present disclosure is to provide a brake device for a vehicle, which can allow a piston to transmit uniform loads when a braking force is applied and prevent the piston from being incompletely released when the braking force is released.

[0007] Various embodiments relate to a brake device for a vehicle, including a driving portion configured to generate a driving force, a pair of pressing portions configured to receive the driving force from the driving portion and apply or release a braking force, a load transmission portion installed between the pair of pressing portions and configured to transmit a pressing load of any one of the pair of pressing portions to the other pressing portion, and a load transmission limiting portion configured to selectively limit an operation of the load transmission portion through the pressing load transmission portion.

[0008] The pair of pressing portions can each include a sun gear portion configured to rotate by receiving power from the driving portion, a planetary gear portion configured to rotate while being engaged with the sun gear portion, a carrier portion engaged with the planetary gear portion, and a piston portion connected with the carrier portion and configured to press or release the brake pad while being extended or retracted by receiving rotational force from the carrier portion.

[0009] The load transmission portion can include a pair of ring gear portions configured to rotate while being engaged with the planetary gear portion, and one or more balance gear portions disposed between the pair of ring gear portions and configured to rotate while being engaged with the ring gear portions.

[0010] The load transmission restriction portion can allow rotation of the balance gear portion when the pressing portion applies the braking force, and restrict rotation of the balance gear portion when the pressing portion releases the braking force.

[0011] The load transmission restriction portion can apply rotational resistance to the balance gear portion by pressing the balance gear portion.

[0012] The load transmission restriction portion can press the balance gear portion in an axial direction.

[0013] The load transmission restriction portion can include a support plate fixed to a rotating shaft portion that supports the balance gear portion so that the balance gear portion is rotatable, a pressing plate disposed to face the support plate and configured to be in contact with the balance gear portion, and a pressing member disposed between the support plate and the pressing plate and configured to press the pressing plate toward the balance gear portion.

[0014] The pressing member can be elastically deformable in a longitudinal direction thereof.

[0015] The pressing plate can include a first pressing plate disposed to face one side of the balance gear portion, and a second pressing plate disposed to face the other side of the balance gear portion and configured to receive a pressing force from the pressing member.

[0016] The second pressing plate can be mounted to be movable in a longitudinal direction of the rotating shaft portion.

[0017] The brake device can further include a stopper engaged with the rotating shaft portion and configured to support the support plate.

[0018] The stopper can be mounted to be movable in a longitudinal direction of the rotating shaft portion and adjust a distance between the support plate and the pressing plate.

[0019] The brake device for a vehicle according to the present disclosure, when a braking force is applied, the pressing load is concentrated on any one of a plurality of pressing portions, the load transmission portion can transmit the pressing load to the remaining pressing portions, and allow the pressing portions to press the brake pad with uniform load.

[0020] Further, according to the brake device for a vehicle according to the present disclosure, when the brake force is released, the load transmission restriction portion can restrict the operation of the load transmission portion. Therefore, it is possible to quickly separate the pair of piston portions from the brake pad and prevent drag due to incomplete release of the piston portions. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A perspective view for schematically illustrating a configuration of a brake device for a vehicle according to an embodiment of the present disclosure.

[0022] Figure 2 An exploded perspective view for schematically illustrating a configuration of a brake device for a vehicle according to an embodiment of the present disclosure.

[0023] Figure 3 A front view for schematically illustrating a configuration of a brake device for a vehicle according to an embodiment of the present disclosure.

[0024] Figure 4 An enlarged view for schematically illustrating a mounting state of a load transmission restriction portion according to an embodiment of the present disclosure.

[0025] Figure 5 A perspective view for schematically illustrating a configuration of a load transmission restriction portion according to an embodiment of the present disclosure.

[0026] Figure 6 An exploded perspective view for schematically illustrating a configuration of a load transmission restriction portion according to an embodiment of the present disclosure.

[0027] Figures 7 to 9 An operation view for schematically illustrating a process in which a brake device for a vehicle according to an embodiment of the present disclosure exerts a brake force.

[0028] Figure 10 and 11 An operation view for schematically illustrating a process in which a brake device for a vehicle according to an embodiment of the present disclosure releases a brake force. DETAILED DESCRIPTION

[0029] Hereinafter, a brake device for a vehicle will be described with reference to various exemplary embodiments.

[0030] Hereinafter, an embodiment of a brake device for a vehicle according to the present disclosure will be described with reference to the accompanying drawings.

[0031] Here, the thickness of lines, the size of constituent elements, and the like described in the drawings can be exaggerated for the sake of description and convenience. Furthermore, the terms used hereinafter are defined in consideration of the functions in the present disclosure, and can vary according to the intention of a user or an operator or practice. Therefore, the terms should be defined based on the entire content of this specification.

[0032] Further, in the present specification, when one constitutional element is referred to as being "connected to (or coupled to)" another constitutional element, it can be "directly connected to (or coupled to)" the other element, or "indirectly connected to (or coupled to)" the other element with a further element interposed therebetween. Further, unless explicitly described to the contrary, the word "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0033] Further, throughout the specification, the same reference numbers are used to denote the same constitutional elements. Even if the same or similar reference numbers are not mentioned or described with reference to a specific drawing, the same or similar reference numbers can be described with reference to other drawings. Further, even if a component is not denoted with a reference number in a specific drawing, the component can be described with reference to other drawings. Further, the numbers, shapes, sizes, relative differences in sizes, and the like of the detailed constitutional elements shown in the drawings of the present application are set forth for facilitating understanding and do not limit the embodiments, and the embodiments can be implemented in various ways.

[0034] Figure 1 FIG. 1 is a perspective view schematically illustrating a configuration of a brake device for a vehicle according to an embodiment of the present disclosure, Figure 2 FIG. 2 is a front view schematically illustrating the configuration of the brake device for the vehicle according to the embodiment of the present disclosure, and Figure 3 FIG. 3 is an exploded perspective view schematically illustrating the configuration of the brake device for the vehicle according to the embodiment of the present disclosure.

[0035] Referring to Figures 1 to 3 The brake device 1 for the vehicle according to the embodiment of the present disclosure includes a housing, a driving portion 30, pressing portions 100 and 200, a load transmission portion 300, and a load transmission restriction portion 400.

[0036] The housing has a space in which the pressing portions 100 and 200, the load transmission portion 300, and the load transmission restriction portion 400 can be installed. The housing can be openable and closable so that the components installed in the housing can be easily replaced or managed. The specific shape of the housing is not limited to Figure 1 the shape shown in the drawing, but can be variously designed and changed according to the shapes and sizes of the pressing portions 100 and 200, the load transmission portion 300, and the load transmission restriction portion 400.

[0037] The driving part 30 includes a motor configured to generate power by being supplied with electric power from the outside, and a driving gear connected to an output shaft of the motor and configured to be rotated by the motor. The driving gear can be a spur gear, a bevel gear, a worm gear, etc., capable of transmitting the rotational force of the motor to the pressing parts 100 and 200, and various designs and changes can be made within the technical spirit of the power transmission means.

[0038] The pressing parts 100 and 200 are installed inside the housing. The pressing parts 100 and 200 apply a braking force to the vehicle by receiving power from the driving part 30 and pressing the brake pad 20 that comes into contact with the disc (not shown).

[0039] The pressing parts 100 or 200 are provided in plural, and the plurality of pressing parts 100 or 200 are provided in a parallel manner. The pressing parts 100 and 200 are symmetrically installed on both left and right sides based on the central portion of the brake pad 20 (based on the center of the brake pad 20, the pressing parts 100 and 200 are symmetrically installed on both left and right sides). Figure 2 ).

[0040] The pressing part 100 or 200 according to an embodiment of the disclosure includes a sun gear part 110 or 210, a connecting gear part 120 or 220, a planetary gear part 130 or 230, a carrier part 150 or 250, and a piston part 170 or 270.

[0041] The connecting gear part 120 or 220 according to an embodiment of the disclosure includes a connecting gear body 121 or 221, a connecting wheel 122 or 222, and a connecting insertion part 123 or 223.

[0042] The connecting gear body 121 or 221 defines the schematic appearance of the connecting gear part 120 or 220. According to an embodiment of the disclosure, the connecting gear body 121 or 221 can be provided in the form of an approximately circular plate.

[0043] The connecting wheel 122 or 222 is formed on the outer circumferential surface of the connecting gear body 121 or 221. The connecting wheel 122 or 222 according to an embodiment of the disclosure can have gear teeth continuously extending along the outer circumferential surface of the connecting gear body 121 or 221. The connecting wheels 122 and 222 are engaged with the driving part 30, specifically, the driving gear. Accordingly, the power of the driving part 30 can be transmitted to the connecting gear parts 120 and 220 and rotate the connecting gear parts 120 and 220.

[0044] The connection insertion portion 123 or 223 is formed in the inner space of the connection gear 122 or 222. That is, the connection gear is formed outside the wall formed along the outer circumferential surface of the connection gear body 121 or 221. The connection insertion portion 123 or 223 is formed in the inner space of the wall formed by the connection gear 122 or 222. According to an embodiment of the present disclosure, the connection insertion portion 123 or 223 is provided in the form of a groove. The ring gear portion 310, and more specifically, the ring gear inner portion 311 to be described below, is respectively inserted into the connection insertion portions 123 and 223.

[0045] The sun gear portion 110 and 210 is rotated by receiving power from the driving portion 30. According to the present embodiment, the sun gear portion 110 or 210 is engaged with the connection gear portion 120 or 220. The sun gear portion 110 or 210 can be rotated by the connection gear portion 120 or 220 receiving power from the driving portion 30.

[0046] The sun gear portion 110 or 210 is concentric with the center of rotation of the connection gear portion 120 or 220. Accordingly, when power is transmitted to the connection gear portions 120 and 220 through the power transmission portion, the connection gear portion 120 is rotated on the same rotation axis as the sun gear portion 110, and the connection gear portion 220 is rotated on the same rotation axis as the sun gear portion 210. The sun gear portion 110 or 210 is provided inside the inner circumferential surface of the connection gear portion 120 or 220, and the connection insertion portion 123 or 223 is formed on the connection gear portion 120 or 220.

[0047] The sun gear portion 110 can be formed integrally with the connection gear portion 120, and the sun gear portion 210 can be formed integrally with the connection gear portion 220. Alternatively, the sun gear portion 110 or 210 can be formed separately from the connection gear portion 120 or 220 and formed integrally with the connection gear portion 120 or 220 by being engaged. Since the sun gear portion 110 or 210 is formed integrally with the connection gear portion 120 or 220, when the connection gear portion 120 or 220 is rotated by receiving power from the driving portion 30, the sun gear portion 110 or 210 is also rotated.

[0048] According to an embodiment of the present disclosure, the sun gear portion 110 or 210 includes a sun gear 111 or 211, and a sun gear connection body 112 or 212.

[0049] The sun gear connection body 112 or 212 is engaged with the connection gear body 121 or 221.

[0050] The sun gear 111 or 211 is formed at the center portion of the sun gear connection body 112 or 212, and gear teeth are formed on the outer circumferential surface of the sun gear 111 or 211 so as to mesh with the planetary gear portion 130 or 230.

[0051] The planetary gear portion 130 or 230 is engaged with the sun gear 111 or 211 and rotates and revolves.

[0052] The planetary gear portion 130 or 230 has a plurality of planetary gears 131 or 231. The present embodiment provides an example in which four planetary gears 131 or 231 are provided, but the present disclosure is not limited thereto. The number of planetary gears can be three or less, or five or more.

[0053] The plurality of planetary gears 131 or 231 are provided at equal angles around the center of rotation of the sun gear 111 or 211. The plurality of planetary gears 131 or 231 are engaged with the sun gear 111 or 211 and rotate and / or revolve as the sun gear 111 or 211 rotates.

[0054] The planetary gear portion 130 or 230 is engaged with the carrier portion 150 or 250. As the plurality of planetary gears 131 or 231 revolve, the carrier portion 150 or 250 also rotates clockwise or counterclockwise.

[0055] According to an embodiment of the present disclosure, the carrier portion 150 or 250 includes a carrier body 151 or 251, a carrier rotation shaft 152 or 252, and a carrier connection portion 153 or 253.

[0056] The carrier rotation shaft 152 or 252 protrudes from the carrier body 151 or 251 toward the planetary gear portion 130 or 230.

[0057] The carrier rotation shaft 152 or 252 is provided in plural, and the number of the plurality of carrier rotation shafts 152 or 252 is equal to that of the planetary gear portion 130 or 230. The carrier rotation shaft 152 or 252 is engaged with the planetary gear portion 130 or 230 throughout. Accordingly, the planetary gear portion 130 or 230 can rotate and revolve on the carrier rotation shaft 152 or 252.

[0058] The carrier connection portion 153 or 253 is formed on the inner circumferential surface of the carrier body 151 or 251 and is connected with a piston connection portion 173 or 273 of a piston portion 170 or 270.

[0059] In the present embodiment, the carrier connection portion 153 or 253 is provided in the form of a groove. The piston connection portion 173 or 273 is provided in the form of a protrusion and is inserted into the carrier connection portion 153 or 253.

[0060] Conversely, the piston connection portion 173 or 273 can be provided in the form of a groove, and the carrier connection portion 153 or 253 can be provided in the form of a protrusion and inserted into the piston connection portion 173 or 273.

[0061] The carrier connecting portion 153 or 253 can be engaged with the piston connecting portion 173 or 273 in a spline manner. In addition to the spline, the carrier portion 150 or 250 and the piston portion 170 or 270 can be engaged, for example, in a screw manner, of course.

[0062] The piston portion 170 or 270 is connected with the carrier portion 150 or 250. The piston portion 170 or 270 is extended or retracted while converting the rotational motion of the carrier portion 150 or 250 into linear motion. The piston portion 170 or 270, while being extended or retracted, applies or releases the braking force by pressing or releasing the brake pad 20.

[0063] According to an embodiment of the disclosure, the piston portion 170 or 270 can include a piston body 171 or 271, a piston shaft 172 or 272, and a piston connecting portion 173 or 273.

[0064] The piston body 171 or 271 has a hollow portion therein and moves to be in contact with the brake pad 20. The piston body 171 or 271 can have a cylindrical shape.

[0065] The piston body 171 or 271 is engaged with the piston shaft 172 or 272, and the piston connecting portion 173 or 273 is formed at an end of the piston shaft 172 or 272 directed toward the carrier portion 150 or 250.

[0066] When the carrier portion 150 or 250 rotates, the piston connecting portion 173 or 273 engaged with the carrier connecting portion 153 or 253 in a spline manner rotates, so that the rotational motion of the carrier portion 150 or 250 is converted into linear motion of the piston portion 170 or 270.

[0067] With the linear motion of the piston portion 170 or 270, the piston portion 170 or 270 moves toward the brake pad 20. Accordingly, the piston portion 170 or 270 comes into contact with the brake pad 20 and presses the brake pad 20, and a braking force is generated by friction between the brake pad 20 and the disc.

[0068] The load transmission portion 300 is connected with the pair of pressing portions 100 and 200 and transmits the pressing load of any one of the pressing portions 100 and 200 to the other.

[0069] The load transmission portion 300 according to an embodiment of the disclosure can include a pair of ring gear portions 310 and one or more balance gear portions 320.

[0070] A pair of ring gear portions 310 respectively engage with planetary gear portions 130 and 230 of different pressing portions 100 and 200. The inner peripheral surfaces of the pair of ring gear portions 310 can mesh with planetary gear portions 130 and 230 respectively, allowing the pair of ring gear portions 310 to rotate. The outer peripheral surfaces of the pair of ring gear portions 310 can indirectly mesh with each other through one or more balancing gear portions 320. That is, the balancing gear portion 320 can be disposed between the pair of ring gear portions 310 and mesh with the ring gear portions 310. Each of the ring gear portions 310 can be mounted between the planetary gear 131 or 231 and the connecting wheel 122 or 222.

[0071] According to an embodiment of the present disclosure, the ring gear portion 310 includes an inner ring gear portion 311 and an outer ring gear portion 315.

[0072] The inner portion 311 of the ring gear may be disposed outside the planetary gear portion 130 or 230, and the inner portion 311 of the ring gear has an inner gear portion 312 formed along its inner circumferential surface so as to mesh with the planetary gear portion 130 or 230.

[0073] The outer portion 315 of the ring gear engages with the outer surface of the inner portion 311 of the ring gear, and the outer portion 315 has an external gear portion 316 formed along its outer peripheral surface for meshing with the balance gear portion 320. The outer portion 315 of the ring gear can be integrally formed with the inner portion 311 of the ring gear.

[0074] When installed on one side (based on) Figure 3 When the inner gear portion 312 of the inner ring gear 311 (on the left side) rotates while meshing with the planetary gear portion 130, the outer ring gear portion 315, which is integral with the inner ring gear portion 311, also rotates in the same direction as the inner gear portion 312.

[0075] Therefore, the rotational force of the outer portion 315 of the ring gear on one side is transmitted to the other side (based on the balance gear portion 320) via the balance gear portion 320. Figure 3 The ring gear portion 310 (on the right side), particularly the outer portion 315 of the ring gear.

[0076] The balancing gear 320 rotates while meshing with the ring gear 310, particularly the external gear 316 formed on the outer portion 315 of the ring gear, and transmits the rotational force of the ring gear 310 on one side to the ring gear 310 on the other side.

[0077] More specifically, when the pressing load for pressing the pair of pressing portions 100 and 200, particularly, the pair of piston portions 170 and 270 against the brake pad 20 is applied unevenly, the balancing gear portion 320 transmits the pressing load of the piston portion 170 provided on one side to the piston portion 270 provided on the other side, thereby bringing the pair of piston portions 170 and 270 into contact with the brake pad 20 with a uniform pressing load. Conversely, the balancing gear portion 320 can of course transmit the pressing load of the piston portion 270 provided on the other side to the piston portion 170 provided on one side.

[0078] According to an embodiment of the present disclosure, the balancing gear portion 320 is provided in the form of a spur gear. The central portion of the balancing gear portion 320 is inserted into the rotation shaft portion 321, so that the balancing gear portion 320 is rotatably supported by the rotation shaft portion 321. The balancing gear portion 320 rotates while being engaged with the external gear portion 316 formed along the outer circumferential surface of the annular gear outer portion 315. However, the balancing gear portion 320 can have various shapes other than the spur gear shape, for example, a bevel gear shape or a helical gear shape, whose gear teeth are inclined at a predetermined angle with respect to the rotational center axis of the balancing gear portion 320.

[0079] Further, the present disclosure is not limited to the example in which the balancing gear portion 320 has a gear shape. Various modified examples can be made. For example, the balancing gear portion 320 can be provided in the form of a belt connected to the pair of annular gear portions 310, and transmit power from one pressing portion 100 to the other pressing portion 200.

[0080] The balancing gear portion 320 can be provided in plural. Therefore, the present disclosure is not limited to the present embodiment provided with two balancing gear portions 320. Various modified examples can be made. For example, one or three or more balancing gear portions can be provided depending on the distance between the pair of annular gear portions 310.

[0081] The load transmission restriction portion 400 selectively restricts the operation of the load transmission portion 300 through the pressing load transmission portion 300. More specifically, the load transmission restriction portion 400 selectively restricts the operation of the load transmission portion 300 by pressing the balancing gear portion 320 in the axial direction, thereby applying a rotational resistance having a predetermined size to the balancing gear portion 320.

[0082] That is, when the braking force is applied, the load transmission restriction portion 400 allows the rotation of the balancing gear portion 320, thereby applying a relatively high operation load to the pressing portions 100 and 200 through the rotational resistance. Therefore, the load transmission restriction portion 400 can make the load transmission portion 300 smoothly eliminate the load deviation between the pair of pressing portions 100 and 200 in the process of applying the braking force.

[0083] Further, when the braking force applied by the pressing portions 100 and 200 is released, the load transmission restriction portion 400 restricts the rotation of the counter gear portion 320 such that a relatively low operation load is applied to the pressing portions 100 and 200. Accordingly, the load transmission restriction portion 400 can cause the pair of pressing portions 100 and 200 to be rapidly separated from the brake pad 20 in the process of releasing the braking force, thereby preventing drag caused by residual load.

[0084] In this case, the magnitude of the rotational resistance applied by the load transmission restriction portion 400 can be set to be smaller than the magnitude of the rotational force transmitted from the ring gear portion 310 to the counter gear portion 320 when the braking force is applied by the pressing portions 100 and 200, and greater than the magnitude of the rotational force transmitted from the ring gear portion 310 to the counter gear portion 320 when the braking force applied by the pressing portions 100 and 200 is released.

[0085] Figure 4 FIG. 6 is an enlarged view schematically illustrating a state in which the load transmission restriction portion according to an embodiment of the disclosure is mounted, Figure 5 FIG. 7 is a perspective view schematically illustrating a configuration of the load transmission restriction portion according to an embodiment of the disclosure, and Figure 6 FIG. 8 is an exploded perspective view schematically illustrating a configuration of the load transmission restriction portion according to an embodiment of the disclosure.

[0086] Referring to Figures 4 to 6 The load transmission restriction portion 400 according to an embodiment of the disclosure includes a support plate 410, a pressure plate 420, a pressing member 430, and a stopper 440.

[0087] The support plate 410 is fixed to the rotation shaft portion 321 and supports the pressing member 430, which will be described below. According to an embodiment of the disclosure, the support plate 410 can be provided in the form of a plate disposed in parallel to and facing the counter gear portion 320. The support plate 410 is spaced apart from a lower surface of the counter gear portion 320 at a predetermined interval in the axial direction of the counter gear portion 320. The rotation shaft portion 321 can be inserted into the support plate 410 so that the support plate 410 is slidable in the longitudinal direction of the rotation shaft portion 321. In a state in which the rotation shaft portion 321 is inserted into the support plate 410, the support plate 410 can be fixed in place by abutting the stopper 440, which will be described below.

[0088] The pressure plate 420 is disposed to face the support plate 410 and to be in contact with the counter gear portion 320. The pressure plate 420 is in close contact with the counter gear portion 320 by receiving a pressing force from the pressing member 430, which will be described below. Accordingly, the rotational resistance applied by the load transmission restriction portion 400 to the counter gear portion 320 can be generated by a frictional force applied between the pressure plate 420 and the counter gear portion 320.

[0089] The pressure plate 420 according to an embodiment of the disclosure includes a first pressure plate 421 and a second pressure plate 422.

[0090] The first pressure plate 421 is disposed to face one side of each of the balance gear portions 320. The first pressure plate 421 according to an embodiment of the disclosure can be disposed in the form of a plate disposed in parallel with the upper surfaces of the balance gear portions 320 and facing the balance gear portions 320. The first pressure plate 421 is fixed at a position where the lower surface of the first pressure plate 421 is in contact with the upper surface of the balance gear portion 320. The first pressure plate 421 is in close contact with the upper surface of the balance gear portion 320 by a reaction force generated when the second pressure plate 422 described below is in close contact with the lower surface of the balance gear portion 320. The first pressure plate 421 can be integrated with the rotating shaft portion 321. Alternatively, the first pressure plate 421 can be fixed to the rotating shaft portion 321 by a separate fixing method, an adhesive, or the like in a state where the rotating shaft portion 321 is inserted into the first pressure plate 421.

[0091] The second pressure plate 422 is disposed to face the other side of each of the balance gear portions 320 and to receive a pressing force from the pressing member 430. The second pressure plate 422 according to an embodiment of the disclosure can be disposed in the form of a plate disposed between the upper surface of the support plate 410 and the lower surface of the balance gear portion 320. The second pressure plate 422 is disposed in parallel with the upper surface of the support plate 410 and the lower surface of the balance gear portion 320. The second pressure plate 422 can be installed to be movable in the longitudinal direction of the rotating shaft portion 321 in a state where the rotating shaft portion 321 is inserted into the second pressure plate 422. The lower surface of the second pressure plate 422 is in abutment with the pressing member 430 described below and receives a pressing force from the pressing member 430. The upper surface of the second pressure plate 422 is in close contact with the lower surface of the balance gear portion 320 by the pressing force transmitted from the pressing member 430.

[0092] Accordingly, since the first pressure plate 421 and the second pressure plate 422 are in close contact with both opposite surfaces of the balance gear portion 320, a rotational resistance can be applied to the balance gear portion 320 by a frictional force generated between the first pressure plate 421 and the second pressure plate 422 and the balance gear portion 320.

[0093] The pressing members 430 are disposed between the support plate 410 and the pressure plate 420 and press the pressure plate 420 toward the balancing gear portion 320. The pressing members 430 according to the embodiment of the disclosure can be provided in the form of a disc spring, a coil spring, or the like that is elastically deformable in the longitudinal direction thereof. The pressing members 430 are disposed between the upper surface of the support plate 410 and the lower surface of the second pressure plate 422. Both opposite ends of each of the pressing members 430 are fixed by abutting against the upper surface of the support plate 410 and the lower surface of the second pressure plate 422. The pressing members 430 compressed to a predetermined length can be installed between the support plate 410 and the second pressure plate 422. Thus, the elastic restoring force of the pressing members 430 can press the second pressure plate 422 toward the balancing gear portion 320.

[0094] The stopper 440 is fixed to the rotating shaft portion 321 and supports the support plate 410 on the rotating shaft portion 321. The stopper 440 according to the embodiment of the disclosure can be fixed to the rotating shaft portion 321 in the manner of using various joint structures such as crimping, screwing, or the like. In the state in which the stopper 440 is fixed to the rotating shaft portion 321, the stopper 440 fixes the installation position of the support plate 410 by supporting the lower surface of the support plate 410. Thus, the stopper 440 can prevent the support plate 410 from being arbitrarily moved in the longitudinal direction of the rotating shaft portion 321 by the reaction force applied from the pressing members 430.

[0095] The stopper 440 is installed to be movable in the longitudinal direction of the rotating shaft portion 321, so that the joint position of the stopper 440 with respect to the rotating shaft portion 321 can be adjusted. The stopper 440 is moved in the longitudinal direction of the rotating shaft portion 321, thereby adjusting the interval between the support plate 410 and the pressure plate 420, more specifically, the interval between the support plate 410 and the second pressure plate 422. Thus, the stopper 440 can change the degree to which the pressing members 430 are compressed, thereby adjusting the magnitude of the pressing force applied to the balancing gear portion 320 from the pressing members 430.

[0096] Hereinafter, the operation principle of the brake device 1 for a vehicle configured as described above will be described.

[0097] Figures 7 to 9 To schematically illustrate the operation view of the process in which the brake device for a vehicle according to the embodiment of the disclosure applies a braking force. Figures 7 to 9 To schematically illustrate the operation view of the process in which the brake device for a vehicle according to the embodiment of the disclosure applies a braking force.

[0098] Referring to Figures 7 to 9 To apply a braking force, the electric motor generates power by receiving electric power from the outside, and the connecting gear portions 120 and 220 connected to the output shaft of the electric motor are rotated by the driving gear.

[0099] The sun gear portions 110 and 210 rotate along with the rotation of the connection gear portions 120 and 220. The planetary gears 131 and 231 engaged with the sun gears 111 and 211 revolve around the sun gears 111 and 211 while rotating on their own around the center of rotation thereof.

[0100] As the planetary gears 131 and 231 revolve, the carrier portions 150 and 250 engaged with the planetary gears 131 and 231 rotate clockwise or counterclockwise. As the carrier portions 150 and 250 rotate, the piston portions 170 and 270 engaged with the carrier portions 150 and 250 move toward the brake pad 20 and contact and press the brake pad 20.

[0101] For various reasons, a large amount of power provided by the driving portion 30 can be transmitted to either one of the pair of pressing portions 100 and 200.

[0102] For example, when the pressing portion 100 provided on one side (based on the left side) receives a greater amount of power than the pressing portion 200 provided on the other side (based on the right side), the piston portion 170 provided on one side can contact the brake pad 20 before the piston portion 270 provided on the other side contacts the brake pad 20. Figure 7 Figure 7

[0103] In a state in which the piston portion 170 provided on one side has contacted the brake pad 20 while the piston portion 270 provided on the other side has not contacted the brake pad 20, the planetary gear portion 130 of the pressing portion 100 provided on one side only rotates on its own around its axis of rotation. That is, the planetary gear portion 130 does not revolve.

[0104] More specifically, since power generated by the operation of the driving portion 30 is continuously transmitted to the sun gear 111, the sun gear 111 continuously rotates. In this case, since the piston portion 170 has contacted the brake pad 20, the plurality of planetary gears 131 engaged with the sun gear 111 only rotate on their own around their center of rotation without revolving.

[0105] The ring gear portion 310 provided on one side rotates clockwise or counterclockwise along with the rotation of the plurality of planetary gears 131.

[0106] When the ring gear portion 310 provided on one side rotates, the ring gear outer portion 315 engaged with the ring gear inner portion 311 as one body transmits rotational force to the balance gear portion 320.

[0107] Due to the reaction force between the brake pad 20 and the piston portion 170, when a braking force is applied, a load higher than that applied when the braking force is released is transmitted to the ring gear portion 310. ​​

[0108] Accordingly, the rotational force transmitted from the ring gear portion 310 provided at one side to the balance gear portion 320 becomes higher than the rotational resistance applied to the balance gear portion 320 through the load transmission limiting portion 400, so that the balance gear portion 320 rotates.

[0109] As the balance gear portion 320 rotates, the power supplied to the pressing portion 100 provided at one side is sequentially transmitted to the piston portion 270 at the other side through the balance gear portion 320, the outer gear portion 316 provided at the other side, the inner gear portion 312 of the ring gear inner portion 311, the planetary gear portion 230, and the carrier portion 250 engaged with the planetary gear portion 230.

[0110] Accordingly, the power supplied by the driving portion 30 is transmitted to the piston portion 270 provided at the other side which has not yet contacted the brake pad 20, and the linear motion of the piston portion 170 provided at one side which has already contacted the brake pad 20 is stopped until the piston portion 270 provided at the other side contacts the brake pad 20.

[0111] Thereafter, when the piston portions 170 and 270 provided at one side and the other side both contact the brake pad 20, the power of the driving portion 30 is uniformly transmitted to the piston portions 170 and 270 provided at one side and the other side. Accordingly, the brake pad 20 can be simultaneously pressed by uniform load.

[0112] Figure 10 and 11 An operation view for schematically illustrating a process in which the brake device for a vehicle according to an embodiment of the disclosure releases a braking force.

[0113] In order to release the braking force, the electric motor generates power by receiving electric power from the outside, and the connection gear portions 120 and 220 connected to the output shaft of the electric motor by the driving gear rotate in a direction opposite to the direction in which the connection gear portions 120 and 220 rotate when the braking force is applied.

[0114] The sun gear portions 110 and 210 also rotate together with the rotation of the connection gear portions 120 and 220. The planetary gears 131 and 231 engaged with the sun gears 111 and 211 revolve around the sun gears 111 and 211 while rotating on their own rotation centers.

[0115] As the planetary gears 131 and 231 revolve, the carrier portions 150 and 250 engaged with the planetary gears 131 and 231 rotate in a direction opposite to the direction in which the carrier portions 150 and 250 rotate when the braking force is applied. As the carrier portions 150 and 250 rotate, the piston portions 170 and 270 engaged with the carrier portions 150 and 250 move away from the brake pad 20, thereby releasing the brake pad 20.

[0116] For various reasons, a large amount of power supplied from the driving portion 30 can be transmitted to either one of the pair of pressing portions 100 and 200.

[0117] Even when the braking force is released, a load bias occurs between the pair of pressing portions 100 and 200, and a reaction force is not applied between the brake pad 20 and the piston portion 170. Thus, a load lower than the load applied when the braking force is applied is transmitted to the ring gear portion 310.

[0118] Thus, the rotational force transmitted from the ring gear portion 310 provided on one side to the balance gear portion 320 becomes lower than the rotational resistance applied to the balance gear portion 320 by the load transmission limiting portion 400, and thus the balance gear portion 320 does not rotate.

[0119] Since the balance gear portion 320 does not rotate, the pair of ring gear portions 310 also does not rotate, and thus the load is not transmitted through the load transmission portion 300.

[0120] Thereafter, the load transmitted from the driving portion 30 to the pair of pressing portions 100 and 200 is directly transmitted to the pair of piston portions 170 and 270 as it is.

[0121] Thus, the pair of piston portions 170 and 270 can be rapidly moved away from the brake pad 20.

[0122] Although the present disclosure has been described with reference to the exemplary embodiments depicted in the accompanying drawings, the description of the exemplary embodiments is merely for the purpose of illustration, and those skilled in the art will understand that various modifications and any other exemplary embodiments equivalent thereto are available. Accordingly, the technical scope of the present disclosure should be determined by the technical spirit of the claims.

[0123] Although the exemplary embodiments of the present disclosure have been disclosed for the purpose of illustration, those skilled in the art will understand that various modifications, supplements, and replacements are possible without departing from the scope and spirit of the present disclosure defined in the technical spirit.

Claims

1. A braking device for a vehicle, comprising: A drive unit, configured to generate driving force; A pair of pressing parts are configured to receive driving force from the drive part and apply or release braking force; A load transfer unit is installed between a pair of said pressing units and configured to transfer the pressing load of any one of the pair of said pressing units to the other pressing unit; and A load transfer limiting unit is configured to selectively limit the operation of the load transfer unit by pressing the load transfer unit; The load transmission unit includes: A pair of ring gears, each connected to one of the pressing parts, and One or more balancing gear portions are disposed between a pair of said annular gear portions and configured to rotate while meshing with said annular gear portions; The load transmission limiting part includes: The pressing member is configured to be elastically deformable in its longitudinal direction and presses against the one or more balancing gears in the axial direction.

2. The braking device according to claim 1, wherein, Each of the pair of said pressing parts includes: The sun gear is configured to rotate by receiving power from the drive unit; The planetary gear section is configured to rotate while meshing with the sun gear section; The carrier portion engages with the planetary gear portion; and A piston portion, which is connected to the carrier portion and configured to press or release the brake pad while extending or retracting by receiving rotational force from the carrier portion.

3. The braking device according to claim 2, wherein, The pair of ring gears are configured to rotate while meshing with the planetary gears.

4. The braking device according to claim 1, wherein, When the pressing part applies braking force, the load transmission limiting part allows the rotation of the balancing gear part, and when the pressing part releases the braking force, the load transmission limiting part restricts the rotation of the balancing gear part.

5. The braking device according to claim 1, wherein, The load transmission limiting part applies rotational resistance to the balance gear part by pressing the balance gear part.

6. The braking device according to claim 3, wherein, The load transmission limiting unit further includes: A support plate, fixed to a rotating shaft portion, the rotating shaft portion supporting the balance gear portion, allowing the balance gear portion to rotate; and A pressure plate, which is configured to face the support plate and to contact the balance gear section; The pressing member is disposed between the support plate and the pressure plate and is configured to press the pressure plate against the one or more balance gears.

7. The braking device according to claim 6, wherein, The pressure plate includes: A first pressure plate, which is positioned facing the side of the balancing gear section; and The second pressure plate is positioned facing the other side of the balance gear section and is configured to receive pressing force from the pressing member.

8. The braking device according to claim 7, wherein, The second pressure plate is mounted to be movable in the longitudinal direction of the rotating shaft portion.

9. The braking device according to claim 6, further comprising: A stop block, which engages with the rotating shaft portion and is configured to support the support plate.

10. The braking device according to claim 9, wherein, The stop is installed to be movable in the longitudinal direction of the rotating shaft portion and to adjust the distance between the support plate and the pressure plate.

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