Brake actuator and brake device comprising same

Abstract

A brake actuator includes: a housing; the first motor is mounted in the shell; a transmission gear rotatably mounted in the housing and connected to the first motor; a first parking member that rotates together with the transfer gear; a second motor disposed spaced apart from the first motor; a second parking member connected to the second motor and configured to restrict rotation of the first parking member when the second parking member is rotated in the first rotational direction; and a support member disposed to face the second parking member, and configured to restrict a rotation range of the second parking member in a second rotational direction opposite the first rotational direction. Even if the operation of the first motor is released when parking braking is performed by the first parking member and the second parking member, the brake actuator can maintain the parking braking force.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate to a brake actuator and a brake device including the same, and more particularly, to a brake actuator capable of ensuring stable parking brake performance and a brake device including the same. Background Art

[0002] Generally, a brake device for a vehicle is a device that brings a pad and a disc close to each other by using a driving force to push a piston and brakes the vehicle by using a frictional force between the pad and the disc.

[0003] Among braking systems, an electromechanical brake (EMB) is a device that generates braking force by applying pressure to a piston through a mechanism such as a gear or screw, using a motor directly mounted on the caliper, rather than using oil pressure. The advantages of this type of EMB are that, since it can perform active and independent braking for each wheel, in addition to conventional parking brakes, it can also implement additional functions such as the anti-lock brake system (ABS), electronic stability control system (ESC), traction control system (TCS), and autonomous emergency braking (AEB). Furthermore, the lack of oil pressure transmission delay allows for higher performance.

[0004] Conventional EMBs utilize a ball screw to ensure rapid piston response and high efficiency. However, due to their structural characteristics, these ball screws lack the self-locking mechanism that would otherwise restrict self-rotation. When power to the motor is cut off, conventional EMBs suffer from the problem of arbitrarily releasing the braking force due to the repulsive force between the pad and the piston.

[0005] Background art of the present disclosure is disclosed in Korean Patent Application Publication No. 10-2010-0098846 (September 10, 2010, entitled “Disc brake with parking function”). Summary of the Invention

[0006] Various embodiments are directed to providing a brake actuator capable of ensuring stable parking brake performance and a brake device including the brake actuator.

[0007] In one embodiment, a brake actuator includes a housing; a first motor mounted in the housing; a transmission gear rotatably mounted in the housing and connected to the first motor; a first parking member that rotates together with the transmission gear; a second motor arranged to be spaced apart from the first motor; a second parking member connected to the second motor and configured to limit the rotation of the first parking member when the second parking member rotates in a first rotational direction; and a support member arranged to face the second parking member and configured to limit the rotation range of the second parking member in a second rotational direction opposite to the first rotational direction.

[0008] The first parking member may include a first parking body connected to the first output shaft of the first motor; and a plurality of extensions extending from the first parking body and arranged along a circumferential surface of the first parking body.

[0009] The extension portion may be inclined relative to a radial direction of the first parking body.

[0010] The second parking member may include: a second parking body, which is connected to the second output shaft of the second motor and rotates in the first rotational direction or the second rotational direction; a capturing member, which extends from the second parking body and is inserted between the extensions adjacent to each other when the second parking body rotates in the first rotational direction; and a return member, which is connected to the second parking body and is configured to add rotational power in the second rotational direction to the second parking body.

[0011] The return member may apply rotational power in the second rotational direction to the second parking member when the second parking member is in contact with the support member.

[0012] The return member may be arranged to be elastically deformable.

[0013] The return member may be a torsion spring.

[0014] The second parking member may further include a distribution member provided in the second parking body.

[0015] The second motor may include a neck portion disposed around the second output shaft. The distribution member may include a motor boss extending from the second parking body and disposed around the neck portion.

[0016] The dispensing member may include a housing boss extending from the second parking body and inserted into the housing.

[0017] The support member may protrude from the housing, and when the second parking body is rotated by a set angle or more in the second rotation direction, the support member comes into contact with the second parking body.

[0018] The end portion of the support member may have a curved shape.

[0019] The first parking body may be movably mounted in the length direction of the first output shaft. When the weight acting between the extension portion and the catch member reaches or exceeds a set value, the first parking body may be movable in a disengagement direction parallel to the length direction of the first output shaft.

[0020] The side surface of the extension portion may be inclined relative to the length direction of the first output shaft.

[0021] The brake actuator may further include a reset member configured to pressurize the first parking member in a direction opposite to the disengaging direction.

[0022] The reset member may include a reset body arranged to face the first parking body; and a pressing member arranged between the reset body and the first parking body and provided to be elastically deformable.

[0023] The pressing member may be a compression spring.

[0024] In one embodiment, a brake device includes: a caliper body; a piston unit movably mounted in the caliper body and configured to contact or separate from a brake pad in a direction of movement of the piston unit; and a brake actuator connected to the piston unit and configured to move the piston unit. The brake actuator includes: a housing; a first motor mounted in the housing; a transmission gear rotatably mounted in the housing and connected to the first motor and the piston unit; a first parking member rotating together with the transmission gear; a second motor spaced apart from the first motor; a second parking member connected to the second motor and configured to limit rotation of the first parking member when the second parking member rotates in a first rotational direction; and a support member disposed so as to face the second parking member and configured to limit the rotation range of the second parking member in a second rotational direction opposite to the first rotational direction.

[0025] According to one embodiment of the present disclosure, even if the operation of the first motor is released when parking braking is performed by the first and second parking members, the brake actuator and the brake device can maintain the parking braking force.

[0026] According to one embodiment of the present disclosure, the brake actuator and the brake device can adjust the operation of the second parking body only by on / off control of the second motor because the second parking body can return to its original position by the return member even without driving of the second motor.

[0027] According to one embodiment of the present disclosure, the brake actuator and the brake device can reduce the stroke length of the second parking member during parking braking and improve space utilization by limiting the rotation range of the second parking member in the second rotation direction through the second support member.

[0028] According to one embodiment of the present disclosure, a brake actuator and a brake device can prevent damage to the second output shaft by distributing a reaction force generated between the extension portion and the capture member when the parking brake is applied through the distributing member.

[0029] According to one embodiment of the present disclosure, if the braking force cannot be released smoothly due to damage to the first and second parking members or erroneous operation of the first and second parking members, the brake actuator and the braking device can forcibly release the braking force through the inclined structure of the extension part and the reset member to prevent the loss of the vehicle's driving ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a perspective view schematically showing the configuration of a brake device according to an embodiment of the present disclosure.

[0031] Figure 2 is a cross-sectional view schematically showing the configuration of a brake device according to an embodiment of the present disclosure.

[0032] Figure 3 is a perspective view schematically showing the configuration of a brake actuator according to an embodiment of the present disclosure.

[0033] Figure 4 is a front view schematically showing the configuration of a brake actuator according to an embodiment of the present disclosure.

[0034] Figure 5 is a perspective view schematically illustrating the configuration of a first parking member and a second parking member according to an embodiment of the present disclosure.

[0035] Figure 6 2 is a front view schematically showing the configuration of a first parking member and a second parking member according to an embodiment of the present disclosure.

[0036] Figure 7 is a side view schematically illustrating the configuration of a first parking member and a second parking member according to an embodiment of the present disclosure.

[0037] Figure 8 is an enlarged view schematically showing the configuration of a dispensing member according to an embodiment of the present disclosure.

[0038] Figure 9 It shows Figure 8 An enlarged view of a modified example of the dispensing member is shown.

[0039] Figure 10 It shows Figure 8 An enlarged view of another variant of the dispensing member is shown.

[0040] Figures 11 to 13 is a diagram schematically showing a process of generating a parking brake force.

[0041] Figure 14 and Figure 15 is a view schematically showing a process of releasing the parking brake force.

[0042] Figure 16 and Figure 17 is a diagram schematically showing a process of forcibly releasing the parking brake force. DETAILED DESCRIPTION

[0043] Hereinafter, a brake actuator and a brake apparatus including the same according to an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0044] In the process, the thickness of the lines or the size of the components shown in the drawings may have been exaggerated for the sake of clarity and convenience. The terms described below have been defined by considering their functions in this disclosure and may change according to the intention or practice of the user or operator. Therefore, these terms should be defined based on the overall content of this specification.

[0045] Furthermore, throughout the specification, when it is described that a component is “connected (or coupled)” to another component, the component may be “directly connected (or coupled)” to the other component, or may be “indirectly connected (or coupled)” to the other component via another member interposed therebetween. When it is mentioned that a component “includes (or contains)” another component, this means that the component may also “include (or contain)” the other component, rather than excluding the other component, unless explicitly described otherwise.

[0046] In addition, throughout the specification, the same reference numerals may represent the same components. Although not mentioned or described in a particular figure, the same or similar reference numerals may be described based on another figure. In addition, although a part of a particular figure is not marked with a reference numeral, the part may be described based on another figure. In addition, the number, shape and size of the detailed components included in the drawings of this application, the relative differences between the sizes, etc. are set for ease of understanding, do not limit the embodiments, and can be implemented in various forms.

[0047] Figure 1 is a perspective view schematically showing the configuration of a brake device according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view schematically showing the configuration of a brake device according to an embodiment of the present disclosure.

[0048] Reference Figure 1 and Figure 2 The brake device 1 according to the present embodiment includes a caliper body 10 , a piston unit 20 and a brake actuator 30 .

[0049] The caliper body 10 forms a schematic appearance of the brake device and may generally support a piston unit 20 and a brake actuator 30 .

[0050] The caliper body 10 according to the present embodiment may include a bridge 11 , fingers 12 , and a cylinder 13 .

[0051] The bridge 11 forms the outer appearance of the central portion of the caliper body 10 and can support the finger 12 and the cylinder 13. The bottom of the bridge 11 can be arranged to face the circumferential surface of the brake disc D by being spaced apart from the circumferential surface of the brake disc D at a predetermined interval. Both sides of the bridge 11 can be parallel to the central axis of the brake disc D (i.e., Figure 1 The detailed shape of the bridge member 11 is not limited to Figure 1 and Figure 2 The shape shown is the same, and the design of the bridge 11 can be changed to various shapes.

[0052] A pair of brake pads P may be arranged below the bridge 11. The pair of brake pads P may be spaced apart from each other along the central axis of the brake disc D. The pair of brake pads P may also be arranged to face each other with the brake disc D interposed therebetween. The pair of brake pads P may be supported by the bracket 2 or the bridge 11 so that the pair of brake pads P can slide and move in a direction parallel to the central axis of the brake disc D. A friction pad comprising a material having a high coefficient of friction (e.g., rubber) may be attached to one surface of the brake pads P facing the brake disc D.

[0053] The bridge 11 can be movably connected to the bracket 2 fixed to the steering knuckle (not shown) through a guide rod 11a. When the vehicle brakes, the bridge 11 can slide and move in a direction parallel to the central axis of the brake disc D due to the reaction force generated between the brake pad P and the piston unit 20.

[0054] The finger 12 may extend downward from one side of the bridge 11. The finger 12 may be integrally connected to the bridge 11 by welding, stamping, or bending. The finger 12 may be positioned to face either of the pair of brake pads P. The finger 12 may pressurize or release either of the pair of brake pads P toward the brake disc D by sliding and moving the bridge 11.

[0055] The cylinder 13 may extend downward from the other side of the bridge 11. The cylinder 13 may be formed in a cylindrical shape with a hollow interior and one side open. The central axis of the cylinder 13 may be arranged parallel to the central axis of the brake disc D. The open side of the cylinder 13 may be arranged to face the other of the pair of brake pads P.

[0056] The piston unit 20 is movably mounted in the caliper body 10. The piston unit 20 can contact or separate from the other of the pair of brake pads P in its moving direction. When the piston unit 20 contacts the brake pads P, it applies pressure to the brake pads P toward the brake disc D. The brake pads P approach the brake disc D and apply braking force to the vehicle. When the piston unit 20 separates from the brake pads P, the piston unit 20 releases the pressure applied to the brake pads P. The brake pads P separate from the brake disc D and release the braking force applied to the vehicle.

[0057] The piston unit 20 may include a piston 21 , a bolt 22 , and a nut 23 .

[0058] The piston 21 may be formed in a cup shape with one side open. The closed side of the piston 21 may be arranged toward the brake pad P, which is arranged to face the cylinder 13. The open side of the piston 21 may be arranged toward the interior space of the cylinder 13. The exterior of the piston 21 may be supported by the interior of the cylinder 13, allowing the piston 21 to slide and move thereon. Conversely, the exterior of the piston 21 may be spaced apart from the interior of the cylinder 13 by a predetermined distance, forming a gap.

[0059] The piston 21 can be moved in a direction parallel to the central axis of the cylinder 13 (i.e. Figure 1 The piston 21 can move forward and backward in a direction parallel to the X-axis in the cylinder 13. When moving forward, the piston 21 protrudes toward the outside of the cylinder 13 and can pressurize the brake pad P, which is arranged facing the cylinder 13, toward the brake disc D. In this case, the bridge 11 can move in the direction opposite to the movement of the piston 21 due to the reaction force generated between the piston 21 and the brake pad P. When moving backward, the piston 21 releases the pressure applied to the brake pad P and can separate the brake pad P from the brake disc D.

[0060] The bolt 22 is disposed within the cylinder 13 and can be rotated by a driving force applied by the brake actuator 30 .

[0061] For example, the bolt 22 may be formed into a rod shape having a generally circular cross-section. The bolt 22 is disposed within the cylinder 13, and the central axis of the bolt 22 may be aligned with the central axis of the cylinder 13. One end of the bolt 22 may be disposed so as to face the interior of the piston 21, spaced apart from the end thereof by a predetermined distance. The other end of the bolt 22 extends through the closed side of the cylinder 13 and may protrude outside the caliper body 10. When the brake actuator 30 is operated, the bolt 22 may rotate clockwise or counterclockwise about its central axis.

[0062] A groove may be formed on the outer peripheral surface of the bolt 22, wherein the circumference of the electric body having a spherical shape on one side is located in the groove. The groove extends in a spiral shape in the length direction of the bolt 22 and may provide a circulation path for the electric body.

[0063] The nut 23 is provided in the cylinder 13 and can be connected to the bolt 22. The nut 23 can move with the rotation of the bolt 22 to reciprocate linearly in the cylinder 13 in a direction parallel to the length direction of the bolt 22. The nut 23 can pressurize the piston 21 toward the brake pad P or release the pressure of the piston 21 in the moving direction thereof.

[0064] For example, the nut 23 may be formed into a hollow cylindrical shape. The inner circumferential surface of the nut 23 may be arranged to face the outer circumferential surface of the bolt thread 22 by being spaced apart from the outer circumferential surface of the bolt 22 by a predetermined distance. A groove may be formed on the inner circumferential surface of the nut 23, in which the circumferential direction on the other side of the power element is located. The groove extends in a spiral shape in the longitudinal direction of the nut 23 and can provide a circulation path for the power element.

[0065] The nut 23 may receive the rotational power of the bolt 22 through the electric body. When the bolt 22 rotates, the nut 23 may move forward and backward in the length direction of the bolt 22 through the cyclic movement of the electric body.

[0066] During forward movement, the nut 23 contacts the inside of the piston 21 and may pressurize the piston 21 toward the brake disc D. During backward movement, the nut 23 separates from the inside of the piston 21 and may release the pressure applied to the piston 21 .

[0067] The brake actuator 30 is connected to the piston unit 20 and can move the piston unit 20. That is, the brake actuator 30 may function as a component that generates a driving force for applying or releasing a braking force to the vehicle and transmits the generated driving force to the piston unit 20.

[0068] Figure 3is a perspective view schematically showing the configuration of a brake actuator according to an embodiment of the present disclosure. Figure 4 is a front view schematically showing the configuration of a brake actuator according to an embodiment of the present disclosure.

[0069] See also Figure 3 and Figure 4 The brake actuator 30 according to the present embodiment includes a housing 100 , a first motor 200 , a transmission gear 300 , a first parking member 400 , a second motor 500 , a second parking member 600 , and a support member 700 .

[0070] The housing 100 is fixed to the caliper body 10 and may generally support the first motor 200 , the transmission gear 300 , the first parking member 400 , the second motor 500 , and the second parking member 600 .

[0071] The housing 100 may include a housing body 110 and a housing cover 120 .

[0072] The housing body 110 may be formed in a barrel shape with a hollow interior and an open side. The closed side of the housing body 110 may be arranged to face the rear surface of the cylinder 13. The housing body 110 may be fixed to the rear surface of the cylinder 13 by various types of coupling methods such as bolt connection, welding, and assembly coupling. The cross-sectional shape of the housing body 110 is not limited to Figure 3 and Figure 4 The shape shown, the design of its cross-sectional shape can be changed into various shapes.

[0073] The housing cover 120 is arranged to face the housing body 110 and can close the internal space of the housing body 110. The housing cover 120 is formed to have a generally plate-like shape and can be arranged to face the open side of the housing body 110. The housing cover 120 can be fixed to the open side of the housing body 110 by various types of coupling methods such as bolting, welding, and assembly coupling. The cross-sectional shape of the housing cover 120 can be formed to correspond to the cross-sectional shape of the housing body 110.

[0074] The first motor 200 is installed in the housing 100 and generates a rotational power for moving the piston unit 20. For example, the first motor 200 can be exemplified by various types of electric motors, which can rotate the first output shaft 210 by receiving power from the outside. The first motor 200 can be fixed to the outside of the housing body 110 by various types of coupling methods (such as bolt connection, welding, and assembly coupling). The first output shaft 210 passes through the housing body 110 and can protrude into the internal space of the housing body 110. The length direction of the first output shaft 210 can be parallel to the length direction of the cylinder 13 and the bolt 22 (for example, parallel to Figure 3The first motor 200 is electrically connected to and may be powered by a battery of the vehicle.

[0075] The transmission gear 300 may be rotatably installed in the housing 100. The transmission gear 300 is connected to the first motor 200 and rotates in conjunction with the rotational power generated by the first motor 200. The transmission gear 300 may serve as a component for transmitting the rotational power generated by the first motor 200 to the piston unit 20.

[0076] The transmission gear 300 may include a first transmission gear 310 , a second transmission gear 320 , and a third transmission gear 330 .

[0077] The first transmission gear 310 can be connected to the first output shaft 210 of the first motor 200. For example, the first transmission gear 310 can be exemplified as a hollow helical gear or a spur gear, wherein teeth are formed on its outer circumferential surface. The central axis of the first transmission gear 310 can be arranged on the same axis as the central axis of the first output shaft 210 of the first motor 200. The inner circumferential surface of the first transmission gear 310 can be spline-coupled to the outer circumferential surface of the first output shaft 210. Therefore, when the first motor 200 is operated, the first transmission gear 310 can rotate at the same angular velocity as the first output shaft 210.

[0078] The second transmission gear 320 is meshed with and coupled to the first transmission gear 310 and can rotate as the first transmission gear 310 rotates. For example, the second transmission gear 320 can be exemplified as a hollow helical gear or a spur gear with teeth formed on its outer circumferential surface. The central axis of the second transmission gear 320 can be arranged parallel to the central axis of the first transmission gear 310. The second transmission gear 320 can be rotatably supported by a separate shaft (not shown) around its central axis within the housing 100. The outer circumferential surface of the second transmission gear 320 can be meshed with and coupled to the outer circumferential surface of the first transmission gear 310. When the first transmission gear 310 rotates, the second transmission gear 320 can rotate in a direction opposite to the first transmission gear 310. The diameter of the second transmission gear 320 can be larger than the diameter of the first transmission gear 310. Therefore, the second transmission gear 320 can amplify the magnitude of the rotational power transmitted by the first transmission gear 310.

[0079] The third transmission gear 330 meshes with and couples with the second transmission gear 320 and can rotate as the second transmission gear 320 rotates. The third transmission gear 330 serves as a component that ultimately transmits the rotational power generated by the first motor 200 to the piston unit 20. For example, the third transmission gear 330 can be a hollow helical gear or spur gear with teeth formed on its outer circumferential surface. The central axis of the third transmission gear 330 can be parallel to the central axis of the second transmission gear 320. The central axis of the third transmission gear 330 can be coaxial with the central axis of the bolt 22 of the piston unit 20. The outer circumferential surface of the third transmission gear 330 can mesh with and couple with the outer circumferential surface of the second transmission gear 320. When the second transmission gear 320 rotates, the third transmission gear 330 can rotate about its central axis in a direction opposite to that of the second transmission gear 320. The rear end of the bolt 22 protruding from the rear surface of the cylinder 13 can be inserted into the central portion of the third transmission gear 330. The outer circumferential surface of the bolt 22 can be spline-coupled to the inner circumferential surface of the third transmission gear 330. Therefore, when the third transmission gear 330 rotates, the bolt 22 rotates along with the third transmission gear 330, moving the nut 23 forward and backward. The third transmission gear 330 can be formed to have a larger diameter than the second transmission gear 320. Therefore, when the second transmission gear 320 rotates, the third transmission gear 330 rotates at a lower angular velocity than the second transmission gear 320, thereby amplifying the amount of rotational power transmitted to the piston unit 20.

[0080] When the first output shaft 210 rotates in the braking direction, the rotational power of the first output shaft 210 is sequentially transmitted to the first transmission gear 310, the second transmission gear 320, the third transmission gear 330 and the bolt 22. The nut 23 and the piston 21 advance and can bring the brake pad P closer to the brake disc D.

[0081] When the first output shaft 210 rotates in the brake release direction, the rotational power of the first output shaft 210 is sequentially transmitted to the first transmission gear 310, the second transmission gear 320, the third transmission gear 330 and the bolt 220. The nut 23 and the piston 21 retreat, and the brake pad P can be separated from the brake disc D.

[0082] The first parking member 400 rotates together with the transmission gear 300 and may function as a component for maintaining a parking brake force together with the second parking member 600 .

[0083] Figure 5 is a perspective view schematically illustrating the configuration of a first parking member and a second parking member according to an embodiment of the present disclosure. Figure 6 is a front view schematically showing the configuration of a first parking member and a second parking member according to an embodiment of the present disclosure. Figure 7 is a side view schematically illustrating the configuration of a first parking member and a second parking member according to an embodiment of the present disclosure.

[0084] Reference Figures 1 to 7 The first parking component 400 may include a first parking body 410 and an extension portion 420 .

[0085] The first parking body 410 can be connected to the first output shaft 210 of the first motor 200. For example, the first parking body 410 can be formed into a ring shape with a hollow portion formed in the center portion of the first parking body 410. The central axis of the first parking body 410 can be coaxial with the central axis of the first output shaft 210. The inner circumferential surface of the first parking body 410 can be spline-coupled to the outer circumferential surface of the first output shaft 210. When the first output shaft 210 rotates, the first parking body 410 can rotate at the same angular velocity as the first output shaft 210 and the first transmission gear 310. Therefore, the weight applied to the second parking member 600 can be reduced compared to a case where the first parking body 410 is connected to the second transmission gear 320 or the third transmission gear 330, whose rotational power is distributed through a gear ratio. When the first output shaft 210 rotates, the first parking body 410 can rotate together with the first output shaft 210 in the brake application direction or the brake release direction.

[0086] The extension portion 420 extends from the first parking body 410 and can serve as a component that forms an interference structure with the second parking member 600. For example, the extension portion 420 can protrude from the circumferential surface of the first parking body 410 to the outside of the first parking body 410. A plurality of extension portions 420 can be provided. The plurality of extension portions 420 can be arranged along the circumferential surface of the first parking body 410 around the central axis of the first parking body 410. The intervals between adjacent extension portions 420 can be formed uniformly.

[0087] The extension portion 420 may be inclined relative to the radial direction of the first parking body 410. For example, the extension portion 420 may be inclined in the brake release direction (ie, Figure 6 The extension portion 420 may be inclined in a clockwise direction (in the clockwise direction), or the extension portion may be extended in a shape in which the extension portion is bent into a spiral shape at a set angle from the circumferential surface of the first parking body 410. Therefore, when the extension portion 420 is fastened to the second parking member 600, the extension portion 420 can allow the first parking body 410 to rotate in the brake application direction and also restrict the rotation of the first parking body 410 in the brake release direction.

[0088] The second motor 500 is installed in the housing 100 and generates a rotating power that rotates the second parking component 600. For example, the second motor 500 can be exemplified by various types of electric motors, which can rotate the second output shaft 510 by receiving power from the outside. The second motor 500 can be arranged to be spaced apart from the first motor 200. The second motor 500 can be arranged in the housing body 110, or it can also be arranged outside the housing body 110. The second motor 500 can be fixed to the housing body 110 by various coupling methods (such as bolt connection, welding, assembly coupling). The second output shaft 510 can be arranged in the internal space of the housing body 110. The length direction of the second output shaft 510 can be parallel to the length direction of the first output shaft 210. Conversely, the length direction of the second output shaft 510 can also intersect with the length direction of the first output shaft 210. The second motor 500 is electrically connected to the battery of the vehicle and can be powered by it.

[0089] The second parking member 600 may be rotatably mounted in the housing 100. The second parking member 600 may be connected to the second motor 500. The second parking member 600 may rotate in first and second opposite rotational directions about the second output shaft 510 by receiving rotational power from the second motor 500. The second parking member 600 may selectively restrict rotation of the first parking member 400 depending on the rotational direction of the first parking member 400. More specifically, when the second parking member 600 rotates in the first rotational direction, the second parking member 600 may restrict rotation of the first parking member 400. The second parking member 600 may prevent the piston unit 20 from losing the parking brake force because, although the operation of the first motor 200 is suspended when the vehicle's parking brake is applied, the piston unit 20 is not separated from the brake pad P. When the second parking member 600 rotates in the second rotational direction, the second parking member 600 may allow rotation of the first parking member 400. Therefore, when the vehicle operates normally, the second parking member 600 can enable the parking brake operation of the first motor 200 to be smoothly performed.

[0090] The second parking member 600 may include a second parking body 610 , a capture member 620 , and a return member 630 .

[0091] The second parking body 610 forms a schematic appearance of the second parking member 600 and may support the capturing member 620. The second parking body 610 may be connected to the second output shaft 510. The second parking body 610 may rotate in the first and second rotation directions along with the rotation of the second output shaft 510.

[0092] For example, the second parking body 610 may be formed in a substantially rod shape. The second output shaft 510 may be inserted into the second parking body 610. The outer peripheral surface of the second output shaft 510 may be coupled to the interior of the second parking body 610 by a spline. Therefore, when the second output shaft 510 rotates, the second parking body 610 may rotate together with the second output shaft 510 about the second output shaft 510 in the first rotation direction and the second rotation direction. The rotation of the second parking body 610 in the first rotation direction may refer to the rotation of the second parking body 610 with the second output shaft 510. Figure 6 The second output shaft 510 in the second rotation direction rotates counterclockwise. The rotation of the second parking body 610 in the second rotation direction means that the second parking body 610 rotates counterclockwise with the second output shaft 510 in the second rotation direction. Figure 6 The second output shaft 510 in the embodiment rotates clockwise.

[0093] The catch member 620 may extend from the second parking body 610. The catch member 620 may restrict or allow rotation of the extension portion 420 according to a rotation direction of the second parking body 610.

[0094] For example, the capture member 620 may extend from one end of the second parking body 610. The end of the capture member 620 may be arranged to face the first parking member 400. The length direction of the capture member 620 may extend in a curved manner from one end of the second parking body 610 toward the first parking member 400. When the second parking body 610 rotates in the first rotational direction, the capture member 620 may be inserted into a pair of extensions 420 adjacent to each other. In this case, the capture member 620 engages and couples to the extensions 420, and may restrict the rotation of the first parking body 410. When the second parking body 610 rotates in the second rotational direction, the capture member 620 may fall to the outside from the pair of extensions 420 adjacent to each other. In this case, the capture member 620 is separated from the extensions 420, and the first parking body 410 may be allowed to rotate.

[0095] The width of the catch member 620 gradually narrows toward the end thereof. Therefore, when the second parking body 610 rotates in the first rotation direction, the catch member 620 can be more easily inserted between the pair of extension portions 420 adjacent to each other.

[0096] The return member 630 is connected to the second parking body 610 and can add rotational power in the second rotational direction to the second parking body 610. The return member 630 can be configured to be elastically deformable. When the capture member 620 is separated from the extension portion 420, the return member 630 can serve as a component that rotates the second parking body 610 in the second rotational direction through its self-elastic restoring force. Therefore, when the parking brake is released, the return member 630 can return the second parking body 610 to its original angle even without the second motor 500 driving it. Therefore, bidirectional rotation of the second parking body 610 can be achieved simply by turning the second motor 500 on / off.

[0097] For example, the return member 630 can be exemplified as a torsion spring capable of storing or releasing rotational power through its elastic deformation. The central axis of the return member 630 can be coaxial with the central axis of the second output shaft 510. One end of the return member 630 can be connected to the second parking body 610. The other end of the return member 630 can be connected to a portion that is fixed when the second parking body 610 rotates (e.g., the housing 100 or the second motor 500).

[0098] When the catch member 620 is inserted between a pair of adjacent extensions 420, the return member 630 can be installed so as to be compressed or extended in the first rotational direction in its neutral state. Therefore, when the parking brake is released, the return member 630 can separate the catch member 620 from the extensions 420 by constantly applying rotational power to the second parking body 610 in the second rotational direction.

[0099] The second parking member 600 may further include a dispensing member 640 .

[0100] The distribution member 640 may be provided in the second parking body 610. The distribution member 640 may serve as a component that distributes the weight applied to the second output shaft 510 when the extension portion 420 and the capture member 620 are captured and coupled.

[0101] Figure 8 is an enlarged view schematically showing the configuration of a dispensing member according to an embodiment of the present disclosure.

[0102] See also Figure 8, a neck portion 501 may be formed in the second motor 500. The neck portion 501 may extend from one surface of the second motor 500 in the length direction of the second output shaft 510. The central axis of the neck portion 501 may be coaxial with the central axis of the second output shaft 510. The inner circumferential surface of the neck portion 501 may be arranged to surround the outer circumferential surface of the second output shaft 510. The neck portion 501 may be formed to have a larger diameter than the second output shaft 510. Therefore, the neck portion 501 may provide a space in which a bushing or a bearing may be installed between the neck portion 501 and the second output shaft 510.

[0103] The dispensing member 640 may include a motor boss 641 .

[0104] The motor boss 641 can extend from the second parking body 610 toward the second motor 500. The length direction of the motor boss 641 can be parallel to the length direction of the second output shaft 510. The central axis of the motor boss 641 can be located on the same axis as the central axis of the second output shaft 510. The inner circumferential surface of the motor boss 641 can be arranged to surround the outer circumferential surface of the neck 501. The inner circumferential surface of the motor boss 641 can contact the outer circumferential surface of the neck 501. Therefore, when the extension 420 and the capture member 620 are captured and coupled, the motor boss 641 can prevent the second output shaft 510 from being bent or damaged by distributing the reaction force generated between the extension 420 and the capture member 620 to the neck 501. When the second parking body 610 rotates, the motor boss 641 can rotate relative to the neck 501.

[0105] Figure 9 It shows Figure 8 An enlarged view of a modified example of the dispensing member is shown.

[0106] See also Figure 9 , the dispensing member 640 may include a housing boss 642 .

[0107] The housing boss 642 may extend from the second parking body 610 toward the housing 100 (e.g., the housing cover 120). The length direction of the housing boss 642 may be parallel to the length direction of the second output shaft 510. The housing boss 642 may be inserted into the housing cover 120. The exterior of the housing boss 642 may contact the interior of the housing cover 120. Therefore, when the extension 420 and the capture member 620 are captured and coupled, the housing boss 642 can prevent the second output shaft 510 from bending or being damaged by distributing the reaction force generated between the extension 420 and the capture member 620 to the housing 100. The housing boss 642 is not limited to such content and may be inserted into the housing body 110 according to the position of the second motor 500. When the second parking body 610 rotates, the housing boss 642 can rotate relative to the housing 100.

[0108] A plurality of housing bosses 642 may be provided, and the plurality of housing bosses 642 may be arranged in a circumferential direction around the second output shaft 510 .

[0109] Figure 10 It shows Figure 8 An enlarged view of another variant of the dispensing member is shown.

[0110] See also Figure 10 , the distribution member 640 may be configured to include both the motor boss 641 and the housing boss 642. In this case, the motor boss 641 and the housing boss 642 may extend in opposite directions, with the second parking body 610 interposed between the motor boss 641 and the housing boss 642. For example, in Figure 9 In the embodiment, the motor boss 641 may extend downward from the second parking body 610 , and the housing boss 642 may extend upward from the second parking body 610 .

[0111] The support member 700 may be arranged to face the second parking member 600 within the housing 100. The support member 700 may limit the rotation range of the second parking member 600 in the second rotation direction. In other words, the support member 700 may serve as a component that limits the second parking body 610 from rotating at a set angle or greater in the second rotation direction by the elastic force of the return member 630.

[0112] For example, the support member 700 may protrude from the inner wall surface of the housing body 110 toward the second parking body 610. Alternatively, the support member 700 may be positioned facing the first parking body 400, with the second parking body 610 interposed therebetween. After the catch member 620 separates from the extension 420, the position of the support member 700 may be variously designed and modified within a range of positions where the support member 700 can contact the exterior of the second parking body 610, where the second parking body 610 rotates in the second rotational direction due to the elastic force of the return member 630. The end of the support member 700 that contacts the exterior of the second parking body 610 may have a curved shape. Thus, the support member 700 can prevent damage to the second parking body 610 caused by stress concentration when the support member 700 contacts the second parking body 610.

[0113] When the second parking body 610 is in contact with the support member 700, the return member 630 can maintain a state in which rotational force in the second rotational direction is applied to the second parking body 600. That is, when the second parking body 610 is in contact with the support member 700, the return member 630 can be installed in a state in which it has been compressed or extended from a neutral state toward the first rotational direction. Therefore, when no external force is applied to the second parking body 610, the return member 630 can prevent the second parking body 610 from repeatedly contacting or separating with the support member 700 due to external vibration, thereby generating noise or damaging the second parking body 610 or the support member 700.

[0114] The initial position of the second parking body 610 may mean that the second parking body 610 has come into contact with the supporting member 700 .

[0115] The first parking body 410 may be installed to reciprocate in the length direction of the first output shaft 210. For example, the inner circumferential surface of the first parking body 410 may be coupled to the outer circumferential surface of the first output shaft 210 by a spline.

[0116] The side surface of the extension portion 420 may be inclined relative to the length direction of the first output shaft 210. For example, the extension portion 420 may have Figure 5 A cross section that narrows downwards.

[0117] The side surface of the capture member 620 may be parallel to the longitudinal direction of the first output shaft 210. Alternatively, the side surface of the capture member 620 may be inclined relative to the longitudinal direction of the first output shaft 210. In this case, the side surface of the capture member 620 may be formed at an angle corresponding to the inclination angle of the side surface of the extension portion 420, so that the side surface of the capture member 620 contacts the side surface of the extension portion 420.

[0118] Since the side surface of the extension portion 420 has an inclined angle, part of the reaction force acting between the extension portion 420 and the capture member 620 can be transmitted in a direction parallel to the length direction of the first output shaft 210. In this case, when the reaction force acting between the extension portion 420 and the capture member 620 is greater than a set value, the first parking body 410 can move linearly in a disengagement direction parallel to the length direction of the first output shaft 210. When the first parking body 410 moves in the disengagement direction, the extension portion 420 may fall from the capture member 620 to the outside. For example, the disengagement direction may refer to Figure 5 Therefore, if the second parking body 610 cannot rotate smoothly in the second rotation direction due to the capture of the extension 420 and the capture member 620 or damage to the return member 630, the extension 420 can be separated from the capture member 620 by forced rotation of the first output shaft 210.

[0119] The brake actuator 30 may further include a reset member 800 .

[0120] After the first parking body 410 moves in the disengagement direction, the return member 800 can move the first parking body 410 in the direction opposite to the disengagement direction. Therefore, after the extension portion 420 and the catch member 620 are forcibly separated from each other, the return member 800 can restore the first parking body 410 to its original position to prevent the parking brake maintenance performance of the brake actuator 30 from being permanently lost.

[0121] The reset member 800 may include a reset body 810 and an elastic member 820 .

[0122] The reset body 810 may be spaced apart from the first parking body 410 in a direction parallel to the length direction of the first output shaft 210. For example, the reset body 810 may be formed to have a circular plate shape that extends from the circumferential surface of the first output shaft 210 in the radial direction of the first output shaft 210. The bottom of the reset body 810 may be arranged to face the top of the first parking body 410. Conversely, the top of the reset body 810 may face the bottom of the first parking body 410.

[0123] The elastic member 820 can be configured to be elastically deformable in a direction parallel to the lengthwise direction of the first output shaft 210. For example, the elastic member 820 can be a compression spring that is elastically deformable in its lengthwise direction. The lengthwise direction of the elastic member 820 can be parallel to the lengthwise direction of the first output shaft 210. The central axis of the elastic member 820 can be coaxial with the central axis of the first output shaft 210. The ends of the elastic member 820 can respectively contact the facing surfaces of the reset body 810 and the first parking body 410.

[0124] When the first parking body 410 is in its initial position, the elastic member 820 can be installed in a neutral state where the elastic member 820 is neither stretched nor compressed. When the first parking body 410 moves in the disengagement direction, the elastic member 820 can accumulate elastic energy while extending or compressing along its length. After the extension portion 420 and the capture member 620 are forcibly separated from each other, the elastic member 820 can use the elastic energy accumulated in the elastic member 820 to pressurize or propel the first parking body 410 in a direction opposite to the disengagement direction, thereby returning the first parking body 410 to its initial position. When the first parking body 410 rotates in the first rotational direction, the initial position of the first parking body 410 can be variously designed and changed within a range of positions within which the capture member 620 can be inserted between a pair of adjacent extension portions 420.

[0125] The above describes an example in which the first parking body 410 is installed to be reciprocatable in the longitudinal direction of the first output shaft 210 , but the present disclosure is not limited thereto. The second parking body 610 may be installed to be reciprocatable in the longitudinal direction of the second output shaft 510 .

[0126] In this case, the return member 800 may be installed to have a position and structure in which the return member 800 can pressurize the second parking body 610 in a direction opposite to the disengagement direction.

[0127] The brake actuator 30 may also include a control module.

[0128] The control module is connected to the first motor 200 and the second motor 500 and controls the operation of the first motor 200 and the second motor 500. More specifically, the control module can control the operation of the first motor 200 and the second motor 500 based on a brake signal or a brake release signal generated by a user's brake pedal manipulation or a parking brake command. The control module is electrically connected to the first motor 200 and the second motor 500 and can be implemented using an integrated circuit (IC), a microcontroller (μC), a microprocessor, or an application-specific integrated circuit (ASIC). It can control whether the first output shaft 210 and the second output shaft 510 rotate, the rotation speed of the first output shaft 210 and the second output shaft 510, or a combination thereof. The control module can control the rotation direction of the first output shaft 210 and the second output shaft 510 in only one direction through an on / off operation. Conversely, the control module can control the rotation direction of the first output shaft 210 and the second output shaft 510 in both directions through multiple circuits. The control module can be arranged in the housing 100. Instead, the control module may be coupled to the outside of the housing 100 .

[0129] Hereinafter, the operation of the brake actuator 30 according to the embodiment of the present invention will be described.

[0130] Figures 11 to 13 FIG2 is a diagram schematically showing a process of generating a parking brake force.

[0131] See also Figures 11 to 13 During parking braking, when the second parking body 610 is already in its initial position, the first motor 200 can be driven in the brake application direction (ie, Figure 11 The first output shaft 210 is rotated in the counterclockwise direction).

[0132] When the first output shaft 210 rotates in the brake applying direction, the rotational power of the first output shaft 210 is transmitted to the piston unit 20 through the transmission gear 300. The brake pad P contacts the brake disc D, thereby generating a braking force for the vehicle.

[0133] In this case, the first parking member 400 may rotate together with the first output shaft 210 in the brake applying direction.

[0134] Thereafter, the second motor 500 can cause the second output shaft 510 to rotate in the first rotation direction (ie, Figure 12 counterclockwise in the direction of rotation).

[0135] When the second output shaft 510 rotates in the first rotation direction, the second parking body 610 rotates in the first rotation direction together with the second output shaft 510 . The catch member 620 moves toward the first parking member 400 .

[0136] When the second parking body 610 is rotated at a set angle or more in the first rotation direction, the catch member 620 may be inserted between a pair of extensions 420 adjacent to each other.

[0137] The return member 630 is elastically deformed when the second parking body 610 rotates in the first rotation direction, and may accumulate elastic energy for rotating the second parking body 610 in the second rotation direction.

[0138] Thereafter, the operation of the first motor 200 is suspended. By the reaction force acting between the brake disc D and the brake pad P, the brake release direction (ie, Figure 13 The rotational power of the clockwise direction in the

[0139] The extension portion 420 and the capture member 620 are captured and coupled by the rotational power in the brake release direction applied to the first output shaft 210 .

[0140] Thereafter, the rotational power in the brake release direction applied to the first output shaft 210 is offset by the reaction force between the extension 420 and the catch member 620, and the rotation of the first parking body 410 and the first output shaft 210 is restricted.

[0141] Figure 14 and Figure 15 is a view schematically showing a process of releasing the parking brake force.

[0142] Reference Figures 1 to 15 , when the parking brake is released, Figure 12 In the state, the first motor 200 can make the first output shaft 210 in the braking direction (ie, Figure 14The device rotates at a predetermined angle in the counterclockwise direction (in the direction of rotation).

[0143] When the first output shaft 210 rotates in the braking direction, the reaction force acting between the extension portion 420 and the catch member 620 decreases.

[0144] Due to the reduction of the reaction force, the second parking body 610 can rotate in the second rotation direction (ie, Figure 14 (clockwise direction in the figure).

[0145] When the second parking body 610 rotates in the second rotation direction, the catch member 620 falls to the outside from the pair of extensions 420 adjacent to each other, and allows the first parking body 410 and the first output shaft 210 to rotate.

[0146] When the second parking body 610 rotates at a set angle or more in the second rotation direction, the second parking body 610 comes into contact with the support member 700 and the rotation of the second parking body 610 in the second rotation direction may be paused.

[0147] Thereafter, the first output shaft 210 is moved in the brake release direction (ie, Figure 15 and release the parking brake force.

[0148] Figure 16 and Figure 17 is a diagram schematically showing a process of forcibly releasing the parking brake force.

[0149] See also Figures 1 to 17 If the first output shaft 210 is not in the brake application direction (ie, Figure 15 ) or the second parking body 610 is not rotated in the second rotation direction (ie, Figure 15 ), the first motor 200 rotates the first output shaft 210 in the brake release direction (ie, Figure 15 The motor is forced to rotate in the clockwise direction.

[0150] When the first output shaft 210 rotates in the brake releasing direction, the reaction force acting between the extension portion 420 and the catch member 620 increases.

[0151] Part of the reaction force acting between the extension portion 420 and the catch member 620 is transferred in a direction parallel to the length direction of the first output shaft 210 by the inclination angle of the side surface of the extension portion 420 .

[0152] When the magnitude of the reaction force acting between the extension portion 420 and the capture member 620 is greater than a set magnitude, the first parking body 410 is disengaged in a direction parallel to the length direction of the first output shaft 210 (ie, Figure 17 Move in a straight line (upward).

[0153] The extending portion 420 relatively moves with respect to the catching member 620 in the length direction of the first output shaft 210. The extending portion 420 and the catching member 620 may be separated from each other.

[0154] During this process, the elastic member 820 may be elastically deformed in the length direction of the first output shaft 210 and accumulate elastic energy for returning the first parking body 410 to its original position.

[0155] Thereafter, when the second parking body 610 is returned to its initial position by the elastic restoring force of the return member 630, the driving force of the second motor 500, or manually, the first parking body 410 is moved in the direction opposite to the disengagement direction (ie, Figure 17 ) and can return to its initial position.

[0156] 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 by the technical solutions.

Claims

1. A brake actuator comprising: case; a first motor mounted in the housing; a transmission gear rotatably mounted in the housing and connected to the first motor; a first parking member that rotates together with the transmission gear; a second motor disposed so as to be spaced apart from the first motor; a second parking member connected to the second motor and configured to restrict rotation of the first parking member when the second parking member rotates in a first rotational direction; as well as A support member is arranged to face the second parking member, and the support member is configured to limit a rotation range of the second parking member in a second rotation direction opposite to the first rotation direction.

2. The brake actuator according to claim 1, wherein: The first parking member comprises: a first parking body connected to a first output shaft of the first motor; and A plurality of extensions extend from the first parking body and are arranged along a circumferential surface of the first parking body.

3. The brake actuator according to claim 2, wherein: The extending portion is inclined with respect to a radial direction of the first parking body.

4. The brake actuator according to claim 2, wherein: The second parking member comprises: a second parking body connected to a second output shaft of the second motor and rotating in the first rotation direction or the second rotation direction; a catch member extending from the second parking body and being inserted between the extensions adjacent to each other when the second parking body rotates in the first rotation direction; and A return member is connected to the second parking body and is configured to add rotational power in the second rotational direction to the second parking body.

5. The brake actuator according to claim 4, wherein: The return member adds rotational power in the second rotational direction to the second parking member when the second parking member is in contact with the support member.

6. The brake actuator according to claim 4, wherein: The return member is configured to be elastically deformable.

7. The brake actuator according to claim 6, wherein: The return member is a torsion spring.

8. The brake actuator according to claim 4, wherein: The second parking member further includes a distribution member disposed in the second parking body.

9. The brake actuator according to claim 8, wherein: The second motor includes a neck disposed around the second output shaft; and The dispensing member includes a motor boss extending from the second parking body and mounted around the neck.

10. The brake actuator according to claim 8, wherein The dispensing member includes a housing boss extending from the second parking body and inserted into the housing.

11. The brake actuator according to claim 4, wherein: The support member protrudes from the housing and contacts the second parking body, and when the second parking body rotates by a set angle or more in the second rotation direction, the support member contacts the second parking body.

12. The brake actuator according to claim 11, wherein: An end portion of the support member has a curved shape.

13. The brake actuator according to claim 4, wherein: The first parking body is movably mounted in the length direction of the first output shaft, and When the weight acting between the extension portion and the catch member reaches or exceeds a set magnitude, the first parking body moves in a disengagement direction parallel to the lengthwise direction of the first output shaft.

14. The brake actuator according to claim 13, wherein: A side surface of the extending portion is inclined relative to a longitudinal direction of the first output shaft. 15 . The brake actuator of claim 13 , further comprising a reset member configured to pressurize the first parking member in a direction opposite to the disengaging direction.

16. The brake actuator according to claim 15, wherein: The reset member comprises: a reset body arranged to face the first parking body; and A pressing member is disposed between the return body and the first parking body, and the pressing member is configured to be elastically deformable.

17. The brake actuator according to claim 16, wherein: The pressing member is a compression spring.

18. A braking device comprising: caliper body; a piston unit movably mounted in the caliper body and configured to contact or separate from a brake pad in a moving direction of the piston unit; as well as a brake actuator connected to the piston unit and configured to move the piston unit, Wherein, the brake actuator comprises: case; a first motor mounted in the housing; a transmission gear rotatably mounted in the housing and connected to the first motor and the piston unit; a first parking member that rotates together with the transmission gear; a second motor disposed so as to be spaced apart from the first motor; a second parking member connected to the second motor and configured to restrict rotation of the first parking member when the second parking member rotates in a first rotational direction; and A support member is arranged to face the second parking member, and the support member is configured to limit a rotation range of the second parking member in a second rotation direction opposite to the first rotation direction.

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