Parking integrated brake caliper

Abstract

The present invention discloses a parking integrated brake caliper. It comprises a caliper body, a piston arranged in a cylinder hole of the caliper body, and a parking mechanism, wherein the parking mechanism comprises a fixed disk with a through hole in the center and a movable disk with an axis; the fixed disk is fixed at the bottom of the cylinder hole of the caliper body, a boss is arranged on the end face, the axis of the movable disk passes through the center hole of the fixed disk, the end face of the movable disk is provided with a periodically changing continuous curved surface meshing with the fixed disk boss, and the continuous curved surface is pressed against the fixed disk end face boss; during parking braking, the movable disk is driven to rotate relative to the fixed disk, and the rotational motion of the movable disk is converted into the linear motion of the movable disk, thereby pushing the brake block to clamp the brake disk to realize parking braking. The present invention has excellent durability and anti-overload design, the parking stroke and force are precisely controllable and adjustable, the safety factor is high, and the structure is simple and compact.

Description

Technical Field

[0001] The invention relates to a vehicle brake caliper structure, in particular to a parking integrated brake caliper having both parking brake and service brake functions. Background Art

[0002] According to ZL 01805802.7, the parking integrated brake caliper of this type converts the rotational motion of the rotating arm into linear motion, and includes a first disc that can rotate but cannot move linearly, and a second disc that cannot rotate but can move linearly, the two discs are provided with concave ramps of the same structure, a metal ball is provided between the concave ramps of the first disc and the second disc, the rotation of the first disc causes the metal ball to move from the bottom of the concave ramp along the ramp to the top, pushing the second disc to move linearly, and then pushing the piston and the brake pad to press the brake disc, generating a friction torque, and realizing the parking function.

[0003] This structure can better realize the parking function, but the above technical solution has the following three problems:

[0004] At least three metal balls are required to ensure the structural stability of both the first plate and the second plate, which results in a large number of parts and a complicated assembly process;

[0005] The metal ball and the concave ramp are in near-point contact, and the contact area has a strong pressure, which causes the metal ball and the concave ramp to wear more. Especially in the case of overload, the metal ball is at risk of being crushed. Once the metal ball is crushed, the parking function will fail and need to be disassembled for repair;

[0006] When the rotation angle of the first plate exceeds the designed angle, there is a risk of the metal ball slipping out of the concave ramp. Once the metal ball slips out of the ball track, the gap between the first plate and the second plate is at its maximum value, and it cannot be restored even after the driving force is unloaded, resulting in the inability to release the parking brake, which requires disassembly and repair. Summary of the invention

[0007] The purpose of the present invention is to provide a parking integrated brake caliper to solve the problems of the existing parking integrated brake caliper, such as a large number of parts, complex assembly, poor durability, and multiple failure risks, and to achieve parking brake and service brake functions.

[0008] The technical solution adopted by the present invention is:

[0009] The present invention comprises a caliper body, a cylinder hole is provided in the caliper body, a piston movable in the axial direction is installed in the cylinder hole of the caliper body, the outer end surface of the piston is connected to the brake block, a mounting hole is provided in the inner end of the piston, a screw sleeve is installed in the mounting hole, the screw sleeve is sleeved on the threaded end of the screw rod, and the other end of the screw rod is set as a disc-shaped structure; and also comprises a parking mechanism, the disc-shaped structure is connected to the rotating arm through the parking mechanism, and the parking mechanism comprises:

[0010] A fixed plate with a center hole in the center has one end pressed against the bottom of the cylinder hole of the caliper body and kept fixed, and the other end of the fixed plate is connected to the movable plate. The other end face of the fixed plate is provided with N bosses evenly spaced along the circumference, each boss is in a fan-shaped shape, and the thickness of the boss along the circumference of the fixed plate forms a structure in which the middle thickness is greater than the thickness on both sides, and the bosses are arranged symmetrically with respect to the radial center line of the bosses themselves, so that each boss on the fixed plate has N-fold rotational symmetry around the central axis of the fixed plate.

[0011] A movable disk with an axis comprises an axis portion and a disk portion which are coaxially fixed together. The axis portion passes through the center hole of the fixed disk and is coaxially connected to the rotating arm. The disk portion is connected between the screw disk structure and the fixed disk. The end face of the movable disk portion connected to the fixed disk is arranged as a continuous curved surface with N-fold rotational symmetry around the central axis of the movable disk. The continuous curved surface is formed by connecting N fan-shaped annular undulating curved surfaces along the circumferential direction. The middle thickness of each fan-shaped annular undulating curved surface along the circumference of the fixed disk is greater than the thickness on both sides. The continuous curved surface of the movable disk portion is pressed against the end face where the boss of the fixed disk is located. When the parking brake is operated, the movable disk is driven to rotate by the rotating arm, and the movable disk rotates relative to the fixed disk. The rotational motion of the movable disk is converted into a reciprocating offset motion of the movable disk along the axial direction by the matching connection relationship between the continuous curved surface of the movable disk and the boss surface of the fixed disk.

[0012] The N is a natural number not less than 2.

[0013] Each boss is divided into a first boss side, a boss top and a second boss side in sequence along the circumference of the fixing plate. The thickness of the boss top is greater than the thickness of the first boss side and the second boss side on both sides.

[0014] The center angle 2b between the first boss side edge and the second boss side edge on both sides of the boss of the fixing plate is 5 degrees to 180 degrees.

[0015] Each sector annular undulating curved surface is divided into a first curved surface bottom, a curved surface top and a second curved surface bottom along the circumference of the movable disk. The thickness of the movable disk at the curved surface top is greater than the thickness of the movable disk at the first curved surface bottom and the second curved surface bottom on both sides.

[0016] The maximum thickness of the boss of the fixed disk is greater than the difference between the maximum thickness and the minimum thickness of the movable disk portion.

[0017] The boss surface of the fixed disk and the continuous curved surface of the movable disk are both coated with a friction-reducing coating.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Reduce the number of parts, improve assembly efficiency and product reliability;

[0020] 2. By changing the original metal ball structure, the function of the metal ball structure is integrated into the fixed plate and the movable plate, changing from point contact to surface contact. On the one hand, it can effectively avoid the situation where the metal ball is crushed due to overload and the parking function fails; on the other hand, the contact surface of the fixed plate and the movable plate is coated with a polytetrafluoroethylene coating, and the durability is better than the excellent structure;

[0021] 3. The structure designed in the present invention can effectively avoid the technical problem of the metal ball in the existing structure slipping out of the concave ramp and causing the parking brake to be unable to be released. Even if the rotation angle of the movable disc exceeds the design limit, further rotation will automatically release the parking brake;

[0022] 4. In the structure designed by the present invention, the rotation angle of the movable plate and the horizontal displacement of the movable plate are in a linear relationship, the ratio is accurately adjustable, the design freedom is large, and the parking stroke is accurately controllable and adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. The drawings show:

[0024] Figure 1 It is a cross-sectional view of the assembly of the present invention.

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the movable disk of the present invention.

[0026] Figure 3 It is a schematic diagram of the end surface structure of the movable disk of the present invention.

[0027] Figure 4 It is a schematic diagram of the end surface structure of the fixed disk of the present invention.

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the fixed disk of the present invention.

[0029] Figure 6 It is an exploded view of the assembly between the movable disk and the fixed disk of the present invention.

[0030] Figure 7 It is a schematic diagram of the cooperation between the movable disk and the fixed disk of the present invention.

[0031] In the figure, 1. brake block, 2. piston, 3. screw sleeve, 4. caliper body, 5. screw, 6. movable disk, 60. shaft, 61. continuous curved surface, 62. bottom of the first curved surface, 63. top of the curved surface, 64. bottom of the second curved surface, 65. central axis of the movable disk, 7. fixed disk, 70. center hole, 71. boss, 72. central axis of the fixed disk, 73. side of the first boss, 74. side of the second boss, 75. top of the boss, 76. surface of the boss, 77. end face of the fixed disk, 8. rotating arm. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, the specifically implemented brake caliper includes a caliper body 4, which is provided with a cylinder hole. A piston 2 movable in an axial direction is installed on the outer side of the cylinder hole of the caliper body 4, and the outer end surface of the piston 2 is connected to the brake block 1. A mounting hole is provided at the inner end of the piston 2, and a screw sleeve 3 is installed in the mounting hole. The screw sleeve 3 is mounted on the threaded end of the screw rod 5, and the other end of the screw rod 5 is set as a disc structure.

[0034] In the specific implementation, a parking mechanism is provided, and the disc-shaped structure is connected to the rotating arm 8 via the parking mechanism. The parking mechanism includes:

[0035] like Figure 4 and Figure 5 As shown, an annular fixed plate 7 with a center hole 70 in the center has one end pressed against the bottom of the cylinder hole of the caliper body 4 and kept fixed. The fixed plate 7 is prevented from rotational movement and axial movement at the bottom of the cylinder hole of the caliper body 4 by a fixing pin. The other end of the fixed plate 7 is connected to the movable plate 6. The other end face 77 of the fixed plate 7 is provided with three bosses 71 evenly spaced along the circumference. Each boss 71 is fan-shaped. The thickness of the boss 71 along the circumference of the fixed plate 7 forms a structure in which the middle thickness is greater than the thickness on both sides, and the bosses 71 are symmetrically arranged with respect to the radial center line of the bosses 71 themselves, so that each boss 71 on the fixed plate 7 has three-fold rotational symmetry around the central axis of the fixed plate.

[0036] like Figure 2 and Figure 3As shown, a movable disk 6 with an axis includes a shaft portion 60 and a disk portion which are coaxially fixed together. The shaft portion 60 passes through the central hole 70 of the fixed disk 7 and is coaxially connected to the rotating arm 8 via a spline structure. The disk portion is connected between the disk structure of the screw 5 and the fixed disk 7. The disk portion of the movable disk 6 is coaxially connected to the disk structure of the screw 5 via a flat key at the end face connected to the screw 5. The disk portion of the movable disk 6 is arranged at the end face connected to the fixed disk 7 to form a continuous curved surface 61 with three-fold rotational symmetry around the central axis 65 of the movable disk; the continuous curved surface 61 is composed of three fan-shaped undulating curved surfaces connected along the circumferential direction, and the middle thickness of each fan-shaped undulating curved surface along the circumference of the fixed disk 7 is greater than the thickness on both sides. The continuous curved surface 61 of the disk portion of the movable disk 6 is pressed against the end face where the boss 71 of the fixed disk 7 is located.

[0037] like Figure 3 As shown, each boss 71 is divided into a first boss side 73, a boss top 75 and a second boss side 74 along the circumference of the fixed plate 7, and the thickness of the boss top 75 is greater than the thickness of the first boss side 73 and the second boss side 74 on both sides.

[0038] In a specific implementation, the boss 71 of the fixing plate 7 is a fan-shaped symmetrical structure, and the center angle 2b between the first boss side edge 73 and the second boss side edge 74 on both sides is 60 degrees.

[0039] The boss surface 76 of the boss 71 of the fixed plate 7 is composed of two helical surfaces, which are connected by a combination of two helical surfaces, starting from the first boss side edge 73 and the second boss side edge 74 on both sides, both with the fixed plate central axis 72 as the axis, with a pitch of L, and converge at the boss top 75 in the radial direction. The pitch L is 18 mm.

[0040] like Figure 3 As shown, each fan-shaped undulating surface is divided into a first curved surface bottom 62, a curved surface top 63 and a second curved surface bottom 64 respectively along the circumference of the movable disk 6, and the thickness of the movable disk 6 at the curved surface top 63 is greater than the thickness of the movable disk 6 at the first curved surface bottom 62 and the second curved surface bottom 64 on both sides.

[0041] Viewed from another angle, the continuous curved surface 61 of the movable disk 6 is a fan-shaped undulating curved surface with a period from the bottom 62 of the first curved surface on one side through the top 63 of the curved surface to the bottom 64 of the second curved surface on the other side. Each period is a fan-shaped symmetrical structure. The angle 2a from the bottom 62 of the first curved surface to the bottom 64 of the second curved surface is 360 / 3 degrees, that is, the central angle 2a occupied by the fan-shaped undulating curved surface is 360 / 3 degrees.

[0042] The fan-shaped undulating curved surface of one period of the continuous curved surface 61 on the end surface of the movable disk is composed of two spiral surfaces with the first curved surface bottom 62 and the second curved surface bottom 64 on both sides as the starting position, the central axis 65 of the movable disk as the axis, the pitch L, and the spiral surfaces converging to the curved surface top 63 in the radial direction. The pitch is 18mm.

[0043] The maximum thickness of the boss 71 of the fixed disk 7 is 2 mm, that is, the axial vertical distance h1 from the top 75 of the boss to the end face 77 of the fixed disk is 2 mm, which is greater than the difference between the maximum thickness and the minimum thickness of the disk part of the movable disk 6 by 1.5 mm, that is, the axial vertical distance h2 from the top 63 of the curved surface to the bottom 62 of the first curved surface and the bottom 64 of the second curved surface is 1.5 mm, thus avoiding the fixed disk boss and the movable disk curved surface from not being in engagement.

[0044] In a specific implementation, both the boss surface 76 of the fixed disk 7 and the continuous curved surface 61 of the movable disk 6 are coated with a friction-reducing coating to reduce the sliding resistance of the movable disk when it rotates relative to the fixed disk.

[0045] When the parking brake is operated, the movable disc 6 is driven to rotate by the rotating arm 8, and the movable disc 6 rotates relative to the fixed disc 7. The rotating motion of the movable disc 6 is converted into the reciprocating offset motion of the movable disc 6 along the axial direction by the matching connection relationship between the continuous curved surface 61 of the movable disc 6 and the boss surface 76 of the fixed disc 7. The reciprocating axial motion of the movable disc 6 drives the screw 5 to move axially and rotate, and then drives the piston 2 to move axially nonlinearly through the thread pair between the screw 5 and the screw sleeve 3, pushing the brake block 1 to clamp the brake disc to achieve parking brake.

[0046] like Figure 7 As shown, after the fitting contact connection between the continuous curved surface 61 of the movable disk 6 and the boss surface 76 of the fixed disk 7, when the brake block 1 retracts, the curved top 63 of the continuous curved surface 61 of the movable disk 6 will be located in the interval gap between the adjacent bosses 71 of the fixed disk 7; when the brake block 1 is extended, the curved top 63 of the continuous curved surface 61 of the movable disk 6 will be located at the boss top 75 of the boss 71 of the fixed disk 7.

[0047] Specifically, after the movable disk 6 rotates 30 degrees relative to the fixed disk 7, the movable disk 6 moves 1.5 mm in the axial direction.

[0048] When service braking is required, the hydraulic pressure pushes the piston 2 to move along the X direction, so that the brake block clamps the brake disc to achieve braking. At this time, the parking mechanism does not work.

[0049] Therefore, the present invention has excellent durability and anti-overload design, the parking stroke and force are precisely controllable and adjustable, the safety factor is high, and the structure is simple and compact.

Claims

1. A parking integrated brake caliper, comprising a caliper body (4), the caliper body (4) being provided with a cylinder hole, a piston (2) being installed in the cylinder hole of the caliper body (4) and being movable in an axial direction, the outer end surface of the piston (2) being connected to a brake pad (1), the inner end of the piston (2) being provided with a mounting hole, a screw sleeve (3) being installed in the mounting hole, the screw sleeve (3) being sleeved on a threaded end of a screw rod (5), the other end of the screw rod (5) being arranged as a disc-shaped structure; characterized in that: The vehicle also includes a parking mechanism, wherein the disc-shaped structure is connected to the rotating arm (8) via the parking mechanism, and the parking mechanism includes: A fixed plate (7) having a center hole (70) at its center, one end of which is pressed against the bottom of the cylinder hole of the caliper body (4) and is kept fixed, the other end of the fixed plate (7) being connected to the movable plate (6), the other end surface (77) of the fixed plate (7) being provided with N bosses (71) evenly spaced along the circumference, each boss (71) being in a fan-shaped ring shape, the thickness of the bosses (71) along the circumference of the fixed plate (7) forming a structure in which the thickness in the middle is greater than the thickness on both sides, and the bosses (71) are arranged symmetrically about the radial center line thereof, and each boss (71) on the fixed plate (7) has N-fold rotational symmetry around the center axis of the fixed plate; A movable disk (6) with an axis comprises a shaft portion (60) and a disk portion which are coaxially fixed to form an integral whole. The shaft portion (60) passes through a central hole (70) of a fixed disk (7) and is coaxially connected to a rotating arm (8). The disk portion is connected between the disk-shaped structure of a screw rod (5) and the fixed disk (7). The end surface of the disk portion of the movable disk (6) connected to the fixed disk (7) is configured as a continuous curved surface (61) having N-fold rotational symmetry around the central axis (65) of the movable disk. The continuous curved surface (61) is formed by connecting N fan-shaped annular undulating curved surfaces in the circumferential direction. Each fan-shaped annular undulating curved surface The thickness in the middle of the fixed plate (7) along the circumference is greater than the thickness on both sides, and the continuous curved surface (61) of the plate portion of the movable plate (6) is pressed against the end surface of the boss (71) of the fixed plate (7); when the parking brake is operated, the movable plate (6) is driven to rotate by the rotating arm (8), and the movable plate (6) rotates relative to the fixed plate (7), and the rotational motion of the movable plate (6) is converted into a reciprocating offset motion of the movable plate (6) along the axial direction due to the matching connection relationship between the continuous curved surface (61) of the movable plate (6) and the boss surface (76) of the fixed plate (7); The N is a natural number not less than 2.

2. The parking integrated brake caliper according to claim 1, characterized in that: Each boss (71) is respectively divided into a first boss side (73), a boss top (75) and a second boss side (74) in sequence along the circumferential direction of the fixing plate (7), and the thickness of the boss top (75) is greater than the thickness of the first boss side (73) and the second boss side (74) on both sides.

3. The parking integrated brake caliper according to claim 2, characterized in that: The center angle (2b) between the first boss side edge (73) and the second boss side edge (74) on both sides of the boss (71) of the fixing plate (7) is 5 degrees to 180 degrees.

4. The parking integrated brake caliper according to claim 2, characterized in that: Each sector annular undulating curved surface is respectively divided into a first curved surface bottom (62), a curved surface top (63) and a second curved surface bottom (64) in sequence along the circumference of the movable disk (6), and the thickness of the movable disk (6) at the curved surface top (63) is greater than the thickness of the movable disk (6) at the first curved surface bottom (62) and the second curved surface bottom (64) on both sides.

5. The parking integrated brake caliper according to claim 1, characterized in that: The maximum thickness of the boss (71) of the fixed disk (7) is greater than the difference between the maximum thickness and the minimum thickness of the disk portion of the movable disk (6).

6. The parking integrated brake caliper according to claim 1, characterized in that: The boss surface (76) of the fixed disk (7) and the continuous curved surface (61) of the movable disk (6) are both coated with a friction-reducing coating.

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