BEAKING SPRING

Abstract

A pair of pad springs (10) for elastically supporting a pair of pad plates (20) on a support, the pad springs (10) comprising: a pair of clamp feet (400) in contact with projecting surfaces of projections formed on two sides of the facing plates (20); a pair of first anchors (100) connected to lower ends of the bracket feet (400) and shaped to be bent in contact with lower surfaces of the projections; a pair of second anchors (200) connected to upper ends of the bracket feet (400) and shaped to be in contact with upper surfaces of the projections; a connector (300) configured to connect the pair of second anchors (200); and a pair of brackets (500), one end of which is connected to the clamp feet (400) and is shaped to extend inwardly, and the other end of which is curved outwardly to be in contact with and support the decking plates (20) and is shaped to extend, wherein the pair of supports (500) comprises an inner support (510) in contact with and supporting an inner lining of the pair of lining plates (20) and an outer support (520) in contact with and supporting an outer lining of the pair of lining plates (20), and the inner bracket (510) is formed of a material with a higher rigidity than the outer bracket (520).

Description

BACKGROUND1. Field of InterestEmbodiments of the present disclosure relate to a pad spring of a caliper brake, and more particularly, to a pad spring whose brake pad contacting portions have different rigidities to maintain a constant distance between a disc and a pad plate of a brake.2. Description of the Prior ArtGenerally, vehicles necessarily have braking systems for braking. In a caliper brake, which is one of these brake systems, a hydraulic or electronic pressing member and a brake pad are attached to a side surface of a disc that rotates with a vehicle wheel. When a pedal is operated, the brake pad is pressed against the disc, thereby generating a frictional force and being used as a braking force for braking a vehicle.That is, in the brake caliper, the disc and a pad contact each other when the vehicle is braked, and a sufficient distance should be generated between the disc and the pad during the travel of the vehicle.A pad spring is a component that is typically provided in the caliper and is provided in a carrier for receiving a brake shoe to create a constant distance between the disc and the pad plate.However, there is a front side and a rear side in the wheel of the vehicle due to a traveling direction in the caliper brake, there is an inner side that directly receives a force of a mechanism and an outer side that indirectly receives the force of the mechanism in each of a pair of pad plates, and therefore, the pressure on the brake shoe and the pad plate is asymmetric during braking of the vehicle.Since the conventional pad spring is made of a uniform material and is symmetrically shaped, an entire pad spring has a uniform rigidity. This does not correspond to the asymmetric pressure received by a brake shoe and a pad plate, and as a result, the distance between a disc and the pad plate becomes unequal when a vehicle is repeatedly driven and braked. This creates a drag torque problem, in which the disk and the lining plate rub during travel.Accordingly, there is a need for a new pad spring that can maintain a constant distance between a disc and a pad plate by properly matching the asymmetric pressure received by a brake shoe and the pad plate during braking of a vehicle.DE 20 2017 100 837 U1 discloses a pad spring wherein a pair of holders asymmetrically contact the inner and outer pads due to the asymmetric arrangement of the holders on a clip base.DE 10 2021 208 405 A1 discloses a pad spring in which a pair of anchors are provided on the upper and lower sides of a bracket base. The shape, thickness, material or stiffness of the anchors may vary depending on the section. However, the anchors on the inside of the bracket and the anchors on the outside of the bracket are symmetrical to each other.DE 20 2015 104454 U1 discloses a lining spring, wherein the lining spring can be produced in a modular construction unit and can vary depending on the section in shape, thickness and material properties. However, the pad spring on the inner pad side and the pad spring on the outer pad side are symmetrical to each other.[Prior Art][Patent Document]Korean Patent Registration No. 10-1040937 (registered on 07. Jun. 2011)OBJECT AND SOLUTION OF THE OBJECTIt is an object of the invention to provide a pad spring that minimizes drag torque by individually matching the asymmetric pressure applied to a brake shoe and a pad plate of a caliper brake during braking of a vehicle.Another object is to enable a pad spring to be provided in which a separate component is not required due to the material and shape of the pad spring and drag torque of a caliper brake is minimized to reduce manufacturing costs of the caliper brake.This object is achieved by a pair of pad springs according to claims 1 and 7, respectively.In a pair of pad springs according to the present invention, each of a pair of pad springs for elastically supporting a pair of pad plates on a bracket includes a pair of clip legs in contact with protruding surfaces of protrusions formed on two sides of the pad plates, a pair of first anchors connected to lower ends of the clip legs and shaped to be curved in contact with lower surfaces of the protrusions, a pair of second anchors connected to upper ends of the clip legs and shaped to be curved in contact with upper surfaces of the protrusions, a connector configured to connect the pair of second anchors, and a pair of brackets each having one end connected to the clip legs and shaped, in which the pair of brackets extend inward and the other end is curved outward to be in contact with and support the facing plates and is formed to extend, wherein the pair of brackets includes an inner bracket in contact with and support an inner pad of the pair of facing plates and an outer bracket in contact with and support an outer pad of the pair of facing plates, and the inner bracket is formed of a material having a higher rigidity than the outer bracket.A thickness of the pair of brackets may decrease toward the bracket foot and increase toward the facing plate, and an average thickness of the inner bracket may be greater than an average thickness of the outer bracket.A width of the pair of brackets may decrease toward the bracket foot and increase toward the facing plate, and an average width of the inner bracket may be greater than an average width of the outer bracket.In the pair of brackets, at least one opening may be formed, and a total area of the opening formed in the inner bracket may be smaller than a total area of the opening formed in the outer bracket.A length of the inner bracket may be greater than a length of the outer bracket.A portion of the inner bracket connected to the bracket foot may be positioned closer to the pad than a portion of the outer bracket connected to the other bracket foot.In another pad spring pair according to the present invention, each of a pair of pad springs for elastically supporting a pair of pad plates on a bracket includes a pair of clip legs in contact with protruding surfaces of protrusions formed on two sides of the pad plates, a pair of first anchors connected to lower ends of the clip legs and shaped to be curved in contact with lower surfaces of the protrusions, a pair of second anchors connected to upper ends of the clip legs and shaped to be curved in contact with upper surfaces of the protrusions, a connector configured to connect the pair of second anchors, and a pair of brackets each having one end connected to the clip legs and shaped, extending inward and the other end curved outward to be in contact with and support the facing plates and formed to extend, wherein the pair of brackets includes an inner bracket in contact with and support an inner pad of the pair of facing plates and an outer bracket in contact with and support an outer pad of the pair of facing plates, and the inner bracket is formed of a material having a lower stiffness than the outer bracket.A thickness of the pair of brackets may decrease toward the bracket foot and increase toward the facing plate, and an average thickness of the inner bracket may be less than an average thickness of the outer bracket.A width of the pair of brackets may decrease toward the bracket foot and increase toward the pad plate, and an average width of the inner bracket may be less than an average width of the outer bracket.At least one opening may be formed in the two brackets, and a total area of the opening formed in the inner bracket may be larger than a total area of the opening formed in the outer bracket.A length of the inner bracket may be less than a length of the outer bracket.A portion of the inner bracket connected to the bracket foot may be farther from the pad than a portion of the outer bracket connected to the other bracket foot.The inner holder may be formed of iron, aluminum or hard plastic.The outer holder may be formed of iron, aluminum or hard plastic.The shape of the opening may have at least one of a circular, elliptical, rectangular, square, or diamond shape.BRIEF DESCRIPTION OF THE DRAWINGSThese and / or other aspects of the disclosure will become apparent and more fully understood from the following description of the exemplary embodiments taken in conjunction with the accompanying drawings, in which: FIG. 1 is a perspective view showing a pad spring according to the present embodiment; FIG. 2 is a cross-sectional view illustrating a state in which a holder of the pad spring is in contact with and supports a pad plate according to the present embodiment; FIG. 3 is a set of views each showing a side surface of a bracket of a pad spring according to a present embodiment, wherein FIG. 3A is a cross-sectional view showing a typical bracket, FIG. 3B is a cross-sectional view showing a bracket whose parts have different thicknesses, and FIG. 3C is a cross-sectional view showing two brackets having different lengths; and FIG. 4 is a set of views each illustrating a front surface of a bracket of a pad spring according to a present embodiment, wherein FIG. 4A is a cross-sectional view illustrating a typical bracket, FIG. 4B is a cross-sectional view illustrating a bracket whose portions have different widths, and FIG. 4C is a cross-sectional view illustrating a bracket in which a plurality of openings are provided.DETAILED DESCRIPTIONHereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are intended to convey the spirit of the present disclosure to those skilled in the art. The present disclosure is not limited to the embodiments disclosed herein and may be embodied in various forms. In the drawings, parts unrelated to the description may be omitted to make the present disclosure clearer, and components may be exaggerated in size to facilitate understanding of the present disclosure.A caliper brake is a brake device of a vehicle, and serves to generate a frictional force by bringing a disc and a pad plate 20 into contact with each other during braking and generating a sufficient distance between the disc and the pad plate 20 during travel. In this case, a pad spring 10 is a general component of the brake callipers provided in a carrier to create a constant distance between the disc and the pad plate 20. However, since the conventional pad spring 10 has a symmetrical shape and is formed of a material having uniform rigidity, the conventional pad spring 10 cannot adequately overcome asymmetrical pressure applied to a brake shoe and the pad plate 20. As a result, a constant distance cannot be provided between the disk and the facing plate 20, or the distances between the disk and certain portions of the facing plate 20 become different, and thus a drag torque problem occurs that the disk and the facing plate 20 rub each other during travel. The present disclosure aims to solve the problems by implementing the pad spring 10, a part of which coming into contact with the pad plate 20 and a part supporting the pad plate 20 have different rigidities to adequately overcome the asymmetric pressure.FIG. 1 is a perspective view showing a pad spring 10 according to a present embodiment, and FIG. 2 is a cross-sectional view showing a state in which brackets 500 of the pad spring 10 are in contact with and support pad plates 20 according to the present embodiment. As illustrated in FIGS. 1 and 2, the pad spring 10 according to the present disclosure is provided as a pair of pad springs 10 to elastically support a pair of pad plates 20 on a carrier. Specifically, protrusions are formed on two sides of the pad plates, and the pad spring 10 includes a pair of bracket legs 400 each in contact with a protruding surface of one of the protrusions, a pair of first anchors 100 connected to a lower end of the bracket leg 400 and shaped to be bent into contact with a lower surface of the protrusion, a pair of second anchors 200 connected to an upper end of the bracket leg 400 and shaped to be bent into contact with an upper surface of the protrusion, a connector 300 for connecting the pair of second anchors 200, and a pair of brackets 500 each of which is bonded to the bracket leg 400 with one end and shaped to extend inward, and the other end is bent and shaped to extend outward, to be in contact with and support one of the facing plates. The pair of brackets 500 includes an inner bracket 510 that is in contact with and supports an inner pad 21 of the pair of pad plates and an outer bracket 520 that is in contact with and supports an outer pad 22 of the pair of pad plates. The inner bracket 510 and the outer bracket 520 are in contact with and support an inner surface of the inner pad 21 and an inner surface of the outer pad 22, respectively.In this case, the inner bracket 510 is provided with a different rigidity from the outer bracket 520. In order to realize the different rigidities, there are a method in which the inner bracket 510 and the outer bracket 520 are formed of different materials, and a method in which the inner bracket 510 and the outer bracket 520 have different shapes.In a molding method using different materials, the inner bracket 510 may be formed of a material having higher rigidity than the outer bracket 520, and conversely, the inner bracket 510 may be formed of a material having lower rigidity than the outer bracket 520. In this case, the material having the higher rigidity may be one of iron, aluminum, or hard plastic.In a molding method for different shapes, the thickness, length, bonding position, width, and presence of an opening 530 between the inner bracket 510 and the outer bracket 520 are differentiated.FIG. 3 is a set of views each showing a side surface of a bracket 500 of a pad spring 10 according to a present embodiment, wherein FIG. 3A is a cross-sectional view showing a typical bracket 500, FIG. 3B is a cross-sectional view showing a bracket 500 whose parts have different thicknesses, and FIG. 3C is a cross-sectional view showing two brackets 500 having different lengths. Referring to FIG. 3, the bracket 500 in FIG. 3A may have a length L and a thickness t. Generally, the bracket 500 of a pad spring 10 has a constant thickness t in a longitudinal direction (in a direction of the length L). However, as illustrated in FIG. 3B, the bracket 500 may be formed to have a thickness decreasing toward a bracket foot 400 and increasing toward a pad plate, so that a certain rigidity of the entire bracket 500 may be realized, and an inner bracket 510 and an outer bracket 520 may be formed to have different rigidities by such a method. That is, in order for the inner bracket 510 to have higher rigidity than the outer bracket 520, the average thickness of the inner bracket 510 should be greater than the average thickness of the outer bracket 520. Conversely, the average thickness of the inner bracket 510 should be less than the average thickness of the outer bracket 520.Moreover, as illustrated in FIG. 3C, a certain rigidity of the entire bracket 500 may be realized by varying a length of the bracket 500, and a rigidity of an inner bracket 510 and a rigidity of an outer bracket 520 may be realized differently by such a method. That is, in order for the inner bracket 510 to have higher rigidity than the outer bracket 520, a length of the inner bracket 510 should be greater than a length of the outer bracket 520. Conversely, the length of the inner bracket 510 should be less than the length of the outer bracket 520.As illustrated in FIG. 3B, in the bracket 500 of the caliper brake according to the present embodiment, when a portion near the bracket foot 400 has a thickness t 1 and a portion near the pad plates has a thickness t 2, the thickness t 1 may be smaller than the thickness t 2, and as an example, the thickness t 1 may be 0.3 mm and the thickness t 2 may be 0.5 mm. In addition, as illustrated in FIG. 3C, in the bracket 500 of the parking brake, when a larger length is a length L 2 and a smaller length is a length L 1, the length L 1 may be smaller than the length L 2, and as an example, the length L 1 may be 12 mm and the length L 2 may be 15 mm. In this case, the bracket 500 having a large average value of thicknesses between a thickness t 1 and a thickness t 2 has a rigidity greater than the bracket 500 having a small average value thereof, and the bracket 500 having the length L 2 has a rigidity greater than the bracket 500 having the length L 1. However, the present embodiment is not limited to the thickness t 1, the thickness t 2, the length L 1, and the length L 2, and includes each thickness t at which the thickness t 2 is less than the thickness t 2 and each length L at which the length L 1 is less than the length L 2.The rigidity may also vary depending on a part of the bracket 500 connected to the bracket foot 400. There is a method of adjusting the position of one end of the bracket 500 connected to the bracket foot 400 of the pad spring 10 to adjust the distance between the other end of the bracket 500 and the pad plate 20. In this case, even if the bracket 500 has a constant length L, the same effect can be obtained as in a case where the inner bracket 510 and the outer bracket 520 have different rigidities. That is, in order for the inner bracket 510 to have higher rigidity than the outer bracket 520, a part of the inner bracket 510 connected to the bracket leg 400 should be positioned closer to the pad plate than a part of the bracket 520 connected to the bracket leg 400. Conversely, a portion of the inner bracket 510 connected to the bracket foot 400 should be farther from the pad than a portion of the outer bracket 520 connected to the bracket foot 400.Referring to FIG. 2, the brackets 500 of the parking brake according to the present embodiment are bonded to the pair of bracket feet 400. In this case, since the portions where the brackets 500 and the clamp feet 400 are connected to each other are close to each other inwardly, deformation is less even if the pad plates 20 are compressed at the same interval. That is, the same operation as in the low rigidity brackets 500 is performed.FIG. 4 is a set of views each showing a front surface of a bracket 500 of a pad spring 10 according to a present embodiment, wherein FIG. 4A is a cross-sectional view showing a typical bracket 500, FIG. 4B is a cross-sectional view showing a bracket 500 whose portions have different widths, and FIG. 4C is a cross-sectional view showing a bracket 500 in which a plurality of openings 530 are provided. Referring to FIG. 4, the bracket 500 in FIG. 4A may have a width b. Generally, the bracket 500 of the pad spring 10 has a constant width b. However, as illustrated in FIG. 4B, the width of the bracket 500 may decrease toward a bracket foot 400 and increase toward pad plates, and the rigidity of the inner bracket 510 and the rigidity of the outer bracket 520 may become different by such a method. That is, in order for the inner bracket 510 to have higher rigidity than the outer bracket 520, the average width of the inner bracket 510 should be larger than the average width of the outer bracket 520. Conversely, the average width of the inner bracket 510 should be less than the average width of the outer bracket 520.Moreover, a certain rigidity of the entire bracket 500 may be realized by forming at least one opening 530 in the bracket 500 as illustrated in FIG. 4C, and a rigidity of an inner bracket 510 and a rigidity of an outer bracket 520 may become different by such a method. In this case, the opening 530 may have a circular, an elliptical, a rectangular, a square, or a diamond shape. That is, in order for the inner bracket 510 to have higher rigidity than the outer bracket 520, a total area of the opening 530 formed in the inner bracket 510 should be smaller than a total area of the opening 530 formed in the outer bracket 520. Otherwise, the total area of the opening 530 formed in the inner bracket 510 should be larger than the total area of the opening 530 formed in the outer bracket 520.As illustrated in FIG. 4B, in the bracket 500 of the caliper brake according to the present embodiment, when a portion near a bracket foot 400 has a width b 1 and a portion near the pad plate has a width b 2, the width b 1 may be smaller than the width b 2, and as an example, the width b 1 may be 0.8 mm and the width b 2 may be 10 mm. Moreover, as shown in FIG. 4C, the caliper brake bracket 500 may include a circular opening 530, an elliptical opening 530, and a plurality of openings 530. The rigidity of the bracket 500 having a large total area of the openings 530 is lower than the rigidity of the bracket 500 having a small total area of the openings 530. However, the present embodiment is not limited to the width b 1 and the width b 2, and includes any width b in which a width b 1 is smaller than a width b 2, and the present embodiment is not limited to the shapes and the number of the openings 530, and includes any shape and number of the openings 530 passing through the bracket 500.The pad spring 10 of the vehicle according to the present embodiment having such a configuration includes a plurality of brackets 500 provided at four positions divided into a front side, a rear side, an inner side, and an outer side, and the brackets 500 may have different rigidities with respect to materials, thicknesses, lengths, connection positions, widths, and the presence of openings 530 to appropriately correspond to the asymmetric pressure applied to the brake shoe and the pad plate 20 of the caliper brake and minimize drag torque. In the present embodiment, since the material and the shape of the bracket 500 are changed, appropriate rigidity can be easily implemented depending on the type of the caliper, and thus the pad spring 10 can be very universal, and target rigidity can be implemented by simply changing the configuration, thereby reducing the manufacturing cost of the caliper.As is apparent from the above description, the present embodiment minimizes drag torque corresponding to the asymmetric pressure applied to a brake shoe and a pad plate of a caliper brake during braking of a vehicle.The present embodiment does not require a separate component due to the material and shape of a pad spring and can minimize the drag torque of a caliper brake, thereby reducing the manufacturing cost of the caliper brake.

Claims

A pair of pad springs (10) for elastically supporting a pair of pad plates (20) on a support, the pad springs (10) comprising: a pair of bracket feet (400) that are in contact with protruding surfaces of protrusions formed on two sides of the pad plates (20); a pair of first anchors (100) that are connected to lower ends of the bracket feet (400) and are shaped to be bent in contact with lower surfaces of the protrusions; a pair of second anchors (200) that are connected to upper ends of the bracket feet (400) and are shaped to be in contact with upper surfaces of the protrusions; a connector (300) configured to connect the pair of second anchors (200); and a pair of brackets (500), one ends of which are connected to the bracket feet (400) and are shaped to extend inward and the other ends of which are curved outward to be in contact with and support the pad plates (20) and are shaped to extend, wherein the pair of brackets (500) comprises and supports an inner bracket (510) in contact with and supports an inner pad of the pair of pad plates (20) and comprises and supports an outer bracket (520) in contact with and supports an outer pad of the pair of pad plates (20), and the inner bracket (510) is formed of a material having a higher rigidity than the outer bracket (520).The pad spring (10) of claim 1, wherein: a thickness of the pair of brackets (500) decreases toward the bracket foot (400) and increases toward the pad plate (20); and an average thickness of the inner bracket (510) is greater than an average thickness of the outer bracket (520).The pad spring (10) of claim 1 or 2, wherein: a width of the pair of brackets (500) decreases toward the bracket foot (400) and increases toward the pad plate (20); and an average width of the inner bracket (510) is greater than an average width of the outer bracket (520).The pad spring (10) of any one of claims 1 to 3, wherein: at least one opening (530) is formed in the pair of brackets (500); and a total area of the opening (530) formed in the inner bracket (510) is smaller than a total area of the opening (530) formed in the outer bracket (520).The pad spring (10) of any one of claims 1 to 4, wherein a length of the inner bracket (510) is greater than a length of the outer bracket (520).The pad spring (10) according to any one of claims 1 to 5, wherein a part of the inner bracket (510) connected to the bracket leg (400) is disposed closer to the pad plate (20) than a part of the outer bracket (520) connected to the other of the bracket legs (400).A pair of pad springs (10) for elastically supporting a pair of pad plates (20) on a support, the pad springs (10) comprising: a pair of bracket feet (400) that are in contact with protruding surfaces of protrusions formed on two sides of the pad plates (20); a pair of first anchors (100) connected to lower ends of the bracket feet (400) and shaped to be bent in contact with lower surfaces of the protrusions; a pair of second anchors (200) connected to upper ends of the bracket feet (400) and shaped to be in contact with upper surfaces of the protrusions; a connector (300) configured to connect the pair of second anchors (200); and a pair of brackets (500), one ends of which are connected to the bracket feet (400) and are shaped to extend inward and the other ends of which are curved outward to be in contact with and support the pad plates (20) and are shaped to extend, wherein the pair of brackets (500) comprises and supports an inner bracket (510) in contact with and supports an inner pad of the pair of pad plates (20) and comprises and supports an outer bracket (520) in contact with and supports an outer pad of the pair of pad plates (20), and the inner bracket (510) is formed of a material having a lower rigidity than the outer bracket (520).The pad spring (10) of claim 7, wherein: a thickness of the pair of brackets (500) decreases toward the bracket foot (400) and increases toward the pad plate (20); and an average thickness of the inner bracket (510) is less than an average thickness of the outer bracket (520).The pad spring (10) of claim 7 or 8, wherein: a width of the pair of brackets (500) decreases toward the bracket foot (400) and increases toward one of the pad plates (20); and an average width of the inner bracket (510) is less than an average width of the outer bracket (520).The pad spring (10) of any one of claims 7 to 9, wherein: at least one opening (530) is formed in the pair of brackets (500); and a total area of the opening (530) formed in the inner bracket (510) is greater than a total area of the opening (530) formed in the outer bracket (520).The pad spring (10) of any one of claims 7 to 10, wherein a length of the inner bracket (510) is less than a length of the outer bracket (520).The pad spring (10) of any one of claims 7 to 11, wherein a portion of the inner bracket (510) connected to the bracket leg (400) is disposed farther away from the pad plate (20) than a portion of the outer bracket (520) connected to the other of the bracket legs (400).The pad spring (10) according to any one of claims 7 to 12, wherein the inner bracket (510) is formed of one of iron, aluminum, or hard plastic.The pad spring (10) according to any one of claims 7 to 13, wherein the outer bracket (520) is formed of one of iron, aluminum, or hard plastic.The pad spring (10) of claim 4, wherein a shape of the opening (530) comprises at least one of a circular shape, an elliptical shape, a rectangular shape, a square shape, and a rhombic shape.The pad spring (10) of claim 10, wherein a shape of the opening (530) comprises at least one of a circular shape, an elliptical shape, a rectangular shape, a square shape, and a rhombic shape.

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