Resilient spring for disc brake caliper

Abstract

The application discloses a spring sheet for a disc brake caliper. The spring sheet is in the shape of a 2 with a bottom edge removed, and comprises four extending parts connected in sequence. The first extending part has two free end parts. The first free end part extends from a groove formed in a first edge in the middle of the first extending part and forms an included angle with the first extending part. The second free end part extends directly from a second edge on one side of the first extending part and forms an included angle with the first extending part. The outer end part of the first free end part is protruded on both sides to form two head parts. The two head parts are symmetrically arranged on both sides, and the two head parts have an included angle therebetween. The application can completely eliminate the noise recognizable by human ears generated between brake pads and a caliper body during braking and reduce the residual drag torque of the brake caliper.

Description

Technical Field

[0001] The invention relates to components and structural relationships inside a disc brake caliper, in particular to an elastic spring used for the disc brake caliper. Background Art

[0002] A disc brake caliper is typically arranged across the radial circumferential outer boundary of a brake disc, which rotates about a rotation axis defining an axial direction ZZ. The disc brake caliper also defines a radial direction RR, which is orthogonal to the axial direction ZZ, and a tangential direction CC, which is orthogonal to both the axial direction ZZ and the radial direction RR.

[0003] A brake caliper generally includes two caliper bodies on opposite sides, with at least one piston cylinder on each caliper body. A piston is installed in each piston cylinder. The hydraulic piston can apply thrust to the brake pad facing it, causing it to press against the braking surface of the brake disc. The two opposite brake pads press against the two opposite braking surfaces of the brake disc to apply braking effect to the vehicle.

[0004] A brake pad generally includes a brake lining and a friction material fixed thereon. The side of the brake lining facing the piston is adapted to be subjected to the force of the piston, thereby causing the brake pad to produce an axial displacement in the ZZ direction. At the same time, the brake pad also includes two side surfaces facing the caliper body. Usually, there is a gap between these two side surfaces and the caliper body.

[0005] When the brake disc rotates clockwise around the axial direction ZZ, the disc brake caliper pushes the piston through hydraulic pressure, pressing the two opposing brake pads against the two opposite braking surfaces of the brake disc. As a result, the two brake pads are subjected to a force in the positive tangential direction (CC) and displaced until the brake pads contact one side of the caliper body and the gap is completely eliminated. At the same time, the gap between the other side of the brake pad and the caliper body increases to the sum of the original gaps on both sides. This process is usually completed within milliseconds. Part of the impact energy generated by the brake pads on the brake caliper body is dissipated as heat, part is used to cause deformation of the brake lining and caliper body, and the rest is transmitted to the surroundings in the form of sound waves.

[0006] When the braking action ends, the piston returns to the position where no hydraulic pressure is applied. In the absence of external force, the brake pad maintains single-sided contact with the caliper body and cannot return to the initial state of clearance between the two sides.

[0007] The state where there is a gap between the brake pad and the caliper body on only one side is undesirable because when the brake disc rotates counterclockwise around the axial direction ZZ, the disc brake caliper pushes the piston again through hydraulic pressure, pressing the two opposing brake pads against the two opposite braking surfaces of the brake disc. The two brake pads are subjected to a force in the negative tangential direction (CC) and displaced. At this time, there is a gap between the brake pad and the caliper body on only one side, and this gap is the sum of the original gaps on both sides. Therefore, the impact energy generated by the contact between the brake pad and the caliper body is greater than when there is a gap on both sides, and the decibel value of the sound generated will also be higher;

[0008] This sound can be a single impact sound, a continuous chirping sound, or an intermittent shaking sound. This sound is often considered undesirable. It is not only considered as noise, but also makes the driver doubt the safety of the vehicle.

[0009] Moreover, when there is a gap between the brake pad and the caliper body on only one side, the brake pad is in a state of unbalanced force on both sides. When braking is completed, the brake pad cannot completely return to its initial position, and one side cannot be separated from the brake disc surface, resulting in residual drag torque. This residual drag torque is undesirable because the continuous friction between the brake pad and the brake disc will cause noise, additional wear and additional vehicle energy consumption.

[0010] For this reason, a known solution is to minimize the gap between the brake pad and the brake caliper body as much as possible. Reducing the gap can indeed reduce the impact energy, thereby reducing the decibel value of the sound and reducing the probability of being recognized by the human ear. However, there is a lower limit to the reduction of the gap. When the vehicle brakes continuously, the brake pad and the caliper body will expand due to heat. When the gap between the caliper body and the brake pad is less than the expansion of the brake pad and the caliper body, the caliper body and the brake pad will get stuck, causing a reduction in braking efficiency. This risk is unacceptable compared to the noise. The known solution cannot completely eliminate the noise generated by the collision between the brake pad and the caliper body while ensuring that the caliper body and the brake pad do not get stuck. In addition, reducing the gap is not conducive to the disengagement of the brake pad and the brake disc, which may further increase the residual drag torque.

[0011] Furthermore, a known solution involves attaching a rubber shock-absorbing layer to the side of the brake pad where it contacts the caliper body. This design utilizes the rubber's shock-absorbing and damping properties to absorb some of the impact energy, thereby reducing the decibel level and the likelihood of it being detected by the human ear. However, because the rubber layer and the adhesive used for the attachment are much weaker than the brake pad and caliper body, they can be damaged by frequent braking, eventually losing their shock-absorbing and damping properties and causing the noise to reappear. Furthermore, the friction coefficient between the rubber layer and the caliper body is greater than that between the brake lining and the caliper body, hindering the disengagement of the brake pad from the brake disc and potentially further increasing the residual drag torque.

[0012] The known solutions cannot meet the requirements of eliminating noise and reducing the residual drag torque. Summary of the Invention

[0013] In order to solve the problems existing in the background technology, the purpose of the present invention is to design and provide an elastic spring for a disc brake caliper to provide a solution to the above needs. The elastic gasket can completely eliminate noise that can be recognized by the human ear while reducing the residual drag torque.

[0014] The technical solution adopted in the present invention is:

[0015] The elastic spring piece is in the shape of a "2" with the bottom edge removed, and is formed to include a first stretching portion, a second stretching portion, a third stretching portion and a fourth stretching portion connected in sequence;

[0016] The first extension portion has a first free end and a second free end. The first free end extends from a groove defined by a first edge in the middle of the first extension portion. The first free end and the first extension portion are connected to form an angle θ1.

[0017] The second free end portion directly extends from the second edge of one of the two sides of the first extending portion; the second free end portion and the first extending portion are connected to form an angle θ3;

[0018] The first free end extends out of the outer end of the first extension portion and is provided with protrusions on both sides to form a first head and a second head respectively. The first head and the second head are symmetrically arranged on both sides; an angle θ2 is formed between the first head and the second head.

[0019] The elastic spring is made of a metal material layer and a rubber material layer laminated together, and the ratio of the thickness T1 of the metal material layer to the thickness T2 of the rubber material layer is between 1-5.

[0020] The included angle θ1 between the first free end portion and the first extension portion is between 95 degrees and 130 degrees, the included angle θ3 between the second free end portion and the first extension portion is between 110 degrees and 135 degrees, and the included angle θ2 between the first head portion and the second head portion is between 120 degrees and 170 degrees;

[0021] In the first extending portion, a protruding length L2 of the first free end portion is less than 30% of a width L1 of the elastic spring piece, and a protruding length L3 of the second free end portion is less than 30% of the width L1 of the elastic spring piece.

[0022] The second stretching portion is used to connect the first stretching portion and the third stretching portion, the first stretching portion and the second stretching portion are connected to form an angle θ4, the second stretching portion and the third stretching portion are connected to form an angle θ5; the fourth stretching portion is connected to the third stretching portion to form an angle θ7, and the fourth stretching portion has an arched structure protruding toward the outside and toward the brake pad.

[0023] The included angle θ4 between the first stretching portion and the second stretching portion is between 70 degrees and 120 degrees, the included angle θ5 between the second stretching portion and the third stretching portion is between 90 degrees and 130 degrees, and the included angle θ7 between the fourth stretching portion and the third stretching portion is between 70 degrees and 120 degrees;

[0024] The protruding direction K of the arched structure of the fourth extending portion is perpendicular to the vertical plane where the second extending portion is located, and the protruding height H of the arched structure is 70%-150% of the thickness T of the elastic spring.

[0025] One side of the arch structure in the protruding direction is a metal material layer, and the other side is an outer rubber material layer.

[0026] There is an opening structure at the connection between the third extension portion and the fourth extension portion. The third extension portion has a third free end portion, which extends from the first edge of the upper side of the opening structure. The third free end portion and the third extension portion are connected to form an angle θ6.

[0027] The included angle θ6 between the third free end and the third extension portion is between 90 degrees and 130 degrees. The horizontal width L4 of the opening structure is less than 50% of the width L1 of the elastic spring. The horizontal width L5 of the third free end is less than 80% of the horizontal width L4 of the opening structure.

[0028] The disc brake caliper is a disc brake caliper suitable for straddling a brake disc; the brake disc includes a first braking surface and a second braking surface on both sides of the brake disc; the disc brake caliper includes:

[0029] Inner clamp body:

[0030] The inner caliper body includes at least one piston cylinder hole for mounting a piston, a first piston is mounted in the piston cylinder hole, an outer end surface of the first piston is connected to a first brake pad, and the first piston is used to apply an axial force in a ZZ direction to the first brake pad to press the first brake pad against the first braking surface of the brake disc;

[0031] The inner caliper body includes two grooves for mounting elastic springs, the two grooves being located on either side of the inner caliper body, each groove corresponding to a corresponding elastic spring, a portion of the first brake pad being embedded in the groove via the elastic springs, and the elastic springs being used to constrain movement of the first brake pad in the tangential direction CC, the axial direction ZZ, and the radial direction RR;

[0032] The inner caliper body includes two mounting structures for connecting the inner caliper body to a support member for supporting the brake caliper on a vehicle.

[0033] Outer clamp body:

[0034] The outer caliper body includes at least one piston cylinder hole for mounting a piston, a second piston is mounted in the piston cylinder hole, an outer end surface of the second piston is connected to a second brake pad, and the second piston acts to apply an axial force in a ZZ direction to the second brake pad to press the second brake pad against the second braking surface of the brake disc;

[0035] The outer caliper body includes two grooves for installing elastic springs, and the two grooves are located on both sides of the inner caliper body. Each groove corresponds to the installation of an elastic spring, and a part of the second brake pad is embedded in the groove through the elastic spring. The elastic spring is used to constrain the movement of the second brake pad in the tangential direction CC, axial direction ZZ, and radial direction RR.

[0036] Both sides of the first brake pad / the second brake pad in the disc brake caliper are provided with lugs, which are embedded in the 2-shaped groove portion of the elastic spring with the bottom edge removed; the 2-shaped groove portion of the elastic spring with the bottom edge removed is embedded in the two grooves of the inner caliper body / the two grooves of the outer caliper body.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The composite stacking of metal, rubber, and adhesive layers combines the strength of metal and the shock-absorbing and damping properties of rubber. This allows the spring to support the brake pad and absorb impact energy, effectively reducing impact energy by 30%.

[0039] 2. The fourth extension portion has a raised arched structure. When impacted by the brake pad base plate, the arched structure deforms from an arched shape to a straight shape. This deformation process converts the impact kinetic energy of the brake base plate into the elastic potential energy of the elastic spring, which can reduce the impact energy by 15%;

[0040] 3. The combined effect of the above two can reduce the decibel value of the noise generated by the brake pad impact to below 60 decibels, which is lower than the background noise of the vehicle, thus preventing the sound from being recognized by the human ear;

[0041] 4. After the elastic spring is installed to the caliper body, its metal layer faces the brake pad base plate, and is equipped with an arched structure, so that there is a metal-to-metal line contact between the brake pad base plate and the elastic spring, which has low friction resistance and can reduce the brake caliper drag torque by more than 15%. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. The drawings show:

[0043] Figure 1 It is an axial view of the elastic spring of the present invention.

[0044] Figure 2 yes Figure 1 Front view of the elastic reed in FIG.

[0045] Figure 3 yes Figure 1 Left view of the elastic reed in.

[0046] Figure 4 yes Figure 3 A partial view of the elastic reed in FIG.

[0047] Figure 5 yes Figure 1 Auxiliary view of the elastic reed in.

[0048] Figure 6 It is a cross-sectional view of the brake caliper assembly of the present invention.

[0049] Figure 7 It is an axial view of the brake caliper assembly of the present invention.

[0050] Figure 8 Shown Figure 7 Axial view of the inner caliper body, first brake pad and spring spring in FIG.

[0051] Figure 9 Shown Figure 7 Axial view of the outer caliper body, second brake pad and spring spring.

[0052] In the figure, 1. brake caliper assembly, 2. brake disc, 3. inner caliper body, 4. outer caliper body, 5. elastic spring, 6. piston, 7. first brake pad, 8. second brake pad, 9. connecting bolt;

[0053] a first braking surface (21), a second braking surface (22);

[0054] A piston cylinder hole (31), two mounting structures (32, 33), and two grooves (34, 35);

[0055] Piston cylinder hole (41), groove (42, 43);

[0056] a metal material layer (501), a rubber material layer (502);

[0057] a first stretching portion (51), a second stretching portion (52), a third stretching portion (53), and a fourth stretching portion (54);

[0058] A first free end portion (511), a second free end portion (512), a first edge (513), and a second edge (514);

[0059] a first header (5111) and a second header (5112);

[0060] Arched structure (541). DETAILED DESCRIPTION

[0061] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] The elastic spring 5 of the present invention is an elastic spring suitable for a disc brake caliper 1 straddling a brake disc 2 .

[0063] like Figure 6-Figure 9 As shown, the disc brake caliper 1 is a disc brake caliper suitable for straddling a brake disc 2 ; the brake disc 2 includes a first braking surface 21 and a second braking surface 22 on both sides of the brake disc, and the disc brake caliper 1 includes an inner caliper body 3 and an outer caliper body 4 .

[0064] Inner clamp body 3:

[0065] like Figure 6 As shown, the inner caliper body 3 includes at least one piston cylinder hole 31 for mounting a piston 6. A first piston 6 is mounted in the piston cylinder hole 31. The outer end surface of the first piston 6 is connected to a first brake pad 7. The first piston 6 is used to apply an axial force in the ZZ direction to the first brake pad 7 to press the first brake pad 7 against the first braking surface 21 of the brake disc 2.

[0066] like Figure 8As shown, the inner caliper body 3 includes two grooves 34 and 35 for installing elastic springs 5. The two grooves 34 and 35 are respectively located on both sides of the inner caliper body 3 along the axial direction ZZ. Each groove 34 / 35 corresponds to the installation of an elastic spring 5. A part of the first brake pad 7 is embedded in the groove 34 / 35 through the elastic spring 5. The elastic spring 5 is used to constrain the movement of the first brake pad 7 in the tangential direction CC, the axial direction ZZ, and the radial direction RR.

[0067] like Figure 8 As shown, the inner caliper body 3 includes two mounting structures 32 and 33 for connection. The mounting structures 32 and 33 are used to connect the inner caliper body 3 to a supporting component for supporting the brake caliper on a vehicle. The mounting structures 32 and 33 can be specifically a through hole.

[0068] Outer clamp body 4:

[0069] like Figure 6 As shown, the outer caliper body 4 includes at least one piston cylinder hole 41 for mounting a piston 6. A second piston 6 is mounted in the piston cylinder hole 31. The outer end surface of the second piston 6 is connected to the second brake pad 8. The second piston 6 acts to apply an axial force in the ZZ direction to the second brake pad 8, so that the second brake pad 8 is pressed against the second braking surface 22 of the brake disc.

[0070] like Figure 9 As shown, the outer caliper body 4 includes two grooves 42 and 43 for installing elastic springs 5. The two grooves 42 and 43 are respectively located on both sides of the inner caliper body 3 along the axial direction ZZ. Each groove 42 / 43 corresponds to the installation of an elastic spring 5. A part of the second brake pad 8 is embedded in the groove 42 / 43 through the elastic spring 5. The elastic spring 5 is used to constrain the movement of the second brake pad 8 in the tangential direction CC, the axial direction ZZ, and the radial direction RR.

[0071] In specific implementation, Figure 7 As shown, the inner caliper body 3 and the outer caliper body 4 are connected into one body by at least four connecting bolts 9 so as to be suitable for straddling the brake disc 2, ensuring that the first brake pad 7 and the second brake pad 8 can respectively and simultaneously abut against the first braking surface 21 and the first braking surface 22 of the brake disc 2, thereby achieving the braking function.

[0072] The axial direction ZZ is also the direction toward or away from the brake disc 2 and is parallel to the axial direction of the piston cylinder bore 31. The tangential direction CC and the radial direction RR are both directions perpendicular to the axial direction ZZ. In practice, the disc brake caliper 1 is mounted on the wheel hub. The tangential direction CC is the tangential direction of the hub, and the radial direction RR is the radial direction of the hub.

[0073] like Figure 1 As shown, the elastic spring 5 is in the shape of a 2 with the bottom edge removed as a whole, and is formed to include a first stretching portion 51, a second stretching portion 52, a third stretching portion 53 and a fourth stretching portion 54 that are connected in sequence; the first stretching portion 51, the second stretching portion 52, the third stretching portion 53 and the fourth stretching portion 54 are connected in sequence to form a 2 with the bottom edge removed, the first stretching portion 51 is the top edge of the 2, the second stretching portion 52 is the side edge of the top of the 2, the third stretching portion 53 is the middle edge of the 2, and the fourth stretching portion 54 is the side edge of the bottom of the 2.

[0074] The first extension portion 51 has a first free end portion 511 and a second free end portion 512. The first free end portion 511 extends from a groove defined by a first edge 513 in the middle of the first extension portion 51. The first free end portion 511 and the first extension portion 51 are connected to form an angle θ1 between 95 and 130 degrees.

[0075] The second free end portion 512 extends directly from the second edge 514 on one side of the first extension portion. The second free end portion 512 and the first extension portion 51 are connected to form an angle θ3, which is between 110 degrees and 135 degrees.

[0076] The specific angle setting of the second free end 512 allows the brake pad base plate to enter the elastic spring along a specific angle, playing a guiding role, and effectively avoiding the jamming phenomenon caused by the incorrect posture of the brake pad base plate, thereby causing abnormal increase in noise and drag.

[0077] like Figure 2 As shown, the first free end portion 511 extends outward from the outer end portion of the first extension portion 51 and is provided with protrusions on both sides to form a first head portion 5111 and a second head portion 5112 respectively. The first head portion 5111 and the second head portion 5112 are symmetrically arranged on both sides. Figure 2 The center line MM is arranged symmetrically; Figure 5 As shown, an included angle θ2 is formed between the first head 5111 and the second head 5112 , and the included angle θ2 is between 120 degrees and 170 degrees.

[0078] The structural design of the two heads with a specific angle setting on the first extension part 511 can effectively constrain the movement of the elastic spring in the axial direction ZZ and the radial direction RR, ensuring that the energy of the brake pad base plate is transferred to the caliper body through the elastic spring without causing displacement and deformation of the elastic spring.

[0079] like Figure 4As shown, the elastic spring 5 is made of a metal layer 501 and a rubber layer 502, with the ratio of the thickness T1 of the metal layer 501 to the thickness T2 of the rubber layer 502 being between 1 and 5. The total thickness T of the elastic spring 5 is between 0.2 mm and 2 mm.

[0080] The metal material is stainless steel, and the rubber material is NBR rubber. The two material layers are integrated by a rolling process. The elastic spring 5 is formed into a first stretching portion 51, a second stretching portion 52, a third stretching portion 53 and a fourth stretching portion 54 by a mold.

[0081] In the first extending portion 51 , the first free end portion 511 extends by a length L2 less than 30% of the width L1 of the elastic spring 5 , and the second free end portion 512 extends by a length L3 less than 30% of the width L1 of the elastic spring 5 .

[0082] like Figure 3 As shown, the second stretching portion 52 is used to connect the first stretching portion 51 and the third stretching portion 53. The first stretching portion 51 and the second stretching portion 52 are connected to form an angle θ4, which is between 70 degrees and 120 degrees. The second stretching portion 52 and the third stretching portion 53 are connected to form an angle θ5, which is between 90 degrees and 130 degrees. The fourth stretching portion 54 is connected to the third stretching portion 53 to form an angle θ7, which is between 70 degrees and 120 degrees. The fourth stretching portion 54 has an arched structure 541 that protrudes outward and toward the brake pad.

[0083] like Figure 3 As shown, the protruding direction K of the arch structure 541 of the fourth extending portion 54 is perpendicular to the vertical plane where the second extending portion 52 is located, and the protruding height H of the arch structure 541 is 70%-150% of the thickness T of the elastic spring 5 .

[0084] One side of the arch structure 541 in the protruding direction is the metal material layer 501 , and the other side is the outer rubber material layer 502 .

[0085] The structural design of the specific protruding arch structure 541 on the fourth extension portion 54 allows the arch structure to convert the impact kinetic energy of the brake base plate into the elastic potential energy of the elastic spring through deformation during braking, thereby reducing the impact energy of the brake pad base plate on the caliper body and achieving the effect of reducing noise.

[0086] There is an opening structure 55 at the connection between the third extension portion 53 and the fourth extension portion 54. The third extension portion 53 has a third free end portion 531, which extends from a first edge 551 in the middle of the upper side of the opening structure 55. The third free end portion 531 and the third extension portion 53 are connected to form an angle θ6, which is between 90 degrees and 130 degrees.

[0087] The horizontal width L4 of the opening structure 55 is less than 50% of the width L1 of the elastic spring 5 , and the horizontal width L5 of the third free end portion 531 is less than 80% of the horizontal width L4 of the opening structure 55 .

[0088] The opening structure 55 specifically arranged between the third extension portion 53 and the fourth extension portion 54 and the third free end 531 together with the first free end 511 and the two heads constrain the displacement of the elastic spring in the axial direction ZZ, ensuring that the elastic spring will not tilt or deflect in the groove of the caliper body.

[0089] Both sides of the first brake pad 7 / the second brake pad 8 in the disc brake caliper 1 are provided with lugs, which are embedded in the 2-shaped groove portion of the elastic spring 5 with the bottom edge removed; the 2-shaped groove portion of the elastic spring 5 with the bottom edge removed is embedded in the two grooves 34, 35 of the inner caliper body 3 / the two grooves 42, 43 of the outer caliper body 4.

[0090] In a specific implementation, the angle θ1 formed by the first free end 511 and the first extending portion 51 is 130 degrees; the angle θ2 formed by the first head 5111 and the second head 5112 is 145 degrees; and the angle θ3 formed by the second free end 512 and the first extending portion 51 is 115 degrees.

[0091] An angle θ4 formed by the first extension portion 51 and the second extension portion 52 is 90 degrees; an angle θ5 formed by the second extension portion 52 and the third extension portion 53 is 90 degrees; and an angle θ6 formed by the third free end portion 531 and the third extension portion 53 is 120 degrees.

[0092] The angle θ7 formed by the fourth extending portion 54 and the third extending portion 53 is 90 degrees. The thickness T of the elastic spring 5 is 0.6 mm. The thickness T1 of the metal material layer 501 is 0.5 mm. The thickness T2 of the rubber material layer 502 is 0.1 mm. The ratio T1 / T2 is 5.

[0093] The first free end portion 511 extends by a length L2 corresponding to 25% of the width L1 of the elastic spring 5 ; the second free end portion 512 extends by a length L3 corresponding to 20% of the width L1 of the elastic spring 5 .

[0094] The horizontal width L4 of the opening structure 55 corresponds to 40% of the width L1 of the elastic spring 5 ; the horizontal width L5 of the third free end portion 531 corresponds to 70% of the horizontal width L4 of the opening structure 55 .

[0095] The arch structure 541 of the fourth extending portion 54 has a protruding direction K perpendicular to the plane where the second extending portion 52 is located; the protruding height H of the arch structure 541 is 0.6 mm, corresponding to 100% of the thickness T of the elastic spring 5 .

[0096] In the specific implementation, after bench and actual vehicle testing, the test results are as follows:

[0097] 1) During braking, the noise generated by the brake pad base impacting the elastic spring and caliper body is lower than the ambient background noise (<55dB);

[0098] 2) The test bench drag torque and the actual vehicle drag torque are less than 0.5 Nm, which is 24% lower than the state without the elastic spring of the present invention.

[0099] 3) Test results show that the noise that is recognizable to the human ear generated between the brake pad and the caliper during braking can be completely eliminated and the residual drag torque of the brake caliper can be reduced.

[0100] The foregoing description is by way of illustration only of certain exemplary embodiments of the present invention. Modifications and adjustments may be made by those skilled in the art without departing from the scope of the present invention as defined in the following claims. Therefore, the foregoing drawings and description are illustrative in nature and should not be construed as limiting the scope of the claims.

Claims

1. An elastic spring for a disc brake caliper, characterized in that: The elastic spring (5) is in the shape of a letter "2" with the bottom edge removed, and is formed to include a first stretching portion (51), a second stretching portion (52), a third stretching portion (53) and a fourth stretching portion (54) connected in sequence; The first extension portion (51) has a first free end portion (511) and a second free end portion (512), the first free end portion (511) extending from a groove formed by a first edge (513) in the middle of the first extension portion (51), and the first free end portion (511) and the first extension portion (51) are connected to form an angle θ1; The second free end portion (512) directly extends from a second edge (514) on one side of the first extension portion; the second free end portion (512) is connected to the first extension portion (51) to form an angle θ3; The first free end portion (511) extends out of the outer end portion of the first extension portion (51), and protrusions are provided on both sides to form a first head portion (5111) and a second head portion (5112), respectively. The first head portion (5111) and the second head portion (5112) are symmetrically arranged on both sides; an angle θ2 is formed between the first head portion (5111) and the second head portion (5112); The second stretching portion (52) is used to connect the first stretching portion (51) and the third stretching portion (53), the first stretching portion (51) and the second stretching portion (52) are connected to form an angle θ4, and the second stretching portion (52) and the third stretching portion (53) are connected to form an angle θ5; the fourth stretching portion (54) is connected to the third stretching portion (53) to form an angle θ7, and the fourth stretching portion (54) has an arched structure (541) protruding toward the outside and toward the brake pad; An opening structure (55) is provided at the connection between the third extension portion (53) and the fourth extension portion (54); the third extension portion (53) has a third free end portion (531); the third free end portion (531) extends from a first edge (551) on the upper side of the opening structure (55); and the third free end portion (531) and the third extension portion (53) are connected to form an angle θ6.

2. The elastic spring for a disc brake caliper according to claim 1, characterized in that: The elastic spring (5) is made of a metal material layer (501) and a rubber material layer (502) laminated together, and the ratio of the thickness T1 of the metal material layer (501) to the thickness T2 of the rubber material layer (502) is between 1 and 5.

3. The elastic spring for a disc brake caliper according to claim 1, characterized in that: An included angle θ1 between the first free end portion (511) and the first extension portion (51) is between 95 degrees and 130 degrees, an included angle θ3 between the second free end portion (512) and the first extension portion (51) is between 110 degrees and 135 degrees, and an included angle θ2 between the first head portion (5111) and the second head portion (5112) is between 120 degrees and 170 degrees; In the first extending portion (51), the extending length L2 of the first free end portion (511) is less than 30% of the width L1 of the elastic spring (5), and the extending length L3 of the second free end portion (512) is less than 30% of the width L1 of the elastic spring (5).

4. The elastic spring for a disc brake caliper according to claim 1, characterized in that: An included angle θ4 between the first stretching portion (51) and the second stretching portion (52) is between 70 degrees and 120 degrees, an included angle θ5 between the second stretching portion (52) and the third stretching portion (53) is between 90 degrees and 130 degrees, and an included angle θ7 between the fourth stretching portion (54) and the third stretching portion (53) is between 70 degrees and 120 degrees; The protruding direction K of the arch structure (541) of the fourth extending portion (54) is perpendicular to the vertical plane where the second extending portion (52) is located, and the protruding height H of the arch structure (541) is 70%-150% of the thickness T of the elastic spring (5).

5. The elastic spring for a disc brake caliper according to claim 1, characterized in that: One side of the arch structure (541) in the protruding direction is a metal material layer (501), and the other side is an outer rubber material layer (502).

6. The elastic spring for a disc brake caliper according to claim 1, characterized in that: The included angle θ6 between the third free end portion (531) and the third extending portion (53) is between 90 degrees and 130 degrees, the horizontal width L4 of the opening structure (55) is less than 50% of the width L1 of the elastic spring (5), and the horizontal width L5 of the third free end portion (531) is less than 80% of the horizontal width L4 of the opening structure (55).

7. The elastic spring for a disc brake caliper according to claim 1, characterized in that: The disc brake caliper (1) is a disc brake caliper suitable for straddling a brake disc (2); the brake disc (2) comprises a first braking surface (21) and a second braking surface (22) on both sides of the brake disc; the disc brake caliper (1) comprises: Inner clamp body (3): The inner caliper body (3) comprises at least one first piston cylinder hole (31) for mounting a piston (6), a first piston (6) being mounted in the first piston cylinder hole (31), a first brake pad (7) being connected to an outer end surface of the first piston (6), and the first piston (6) being used to apply an axial force in a ZZ direction to the first brake pad (7) so as to press the first brake pad (7) against a first braking surface (21) of the brake disc (2); The inner caliper body (3) comprises two grooves (34, 35) for mounting elastic springs (5), the two grooves (34, 35) being located on both sides of the inner caliper body (3), each groove (34 / 35) correspondingly mounting an elastic spring (5), a portion of the first brake pad (7) being embedded in the groove (34 / 35) through the elastic spring (5), and the elastic spring (5) being used to constrain the movement of the first brake pad (7) in the tangential direction CC, the axial direction ZZ, and the radial direction RR; Outer clamp body (4): The outer caliper body (4) includes at least one second piston cylinder hole (41) for mounting a piston (6), a second piston (6) is mounted in the second piston cylinder hole (41), an outer end surface of the second piston (6) is connected to a second brake pad (8), and the second piston (6) acts to apply an axial force in a ZZ direction to the second brake pad (8) to press the second brake pad (8) against the second braking surface (22) of the brake disc; The outer caliper body (4) comprises two grooves (42, 43) for mounting elastic springs (5), the two grooves (42, 43) being located on both sides of the outer caliper body (4), and each groove (42 / 43) correspondingly mounting an elastic spring (5), a portion of the second brake pad (8) being embedded in the groove (42 / 43) through the elastic spring (5), and the elastic spring (5) being used to constrain the movement of the second brake pad (8) in the tangential direction CC, the axial direction ZZ, and the radial direction RR.

8. The elastic spring for a disc brake caliper according to claim 7, characterized in that: Lugs are provided on both sides of the first brake pad (7) / the second brake pad (8) in the disc brake caliper (1), and the lugs are embedded in the 2-shaped groove portion of the elastic spring (5) with the bottom edge removed; the 2-shaped groove portion of the elastic spring (5) with the bottom edge removed is embedded in the two grooves (34, 35) of the inner caliper body (3) / the two grooves (42, 43) of the outer caliper body (4).

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