A parking brake caliper and an automobile

Abstract

The present invention provides a parking brake caliper and an automobile, belonging to the technical field of motor vehicle braking. It includes a caliper body, a piston arranged in the caliper body, a return spring seat arranged in the caliper body, and a screw rod with one end arranged in the piston and the other end passing through the return spring seat. A screw rod gasket is sleeved on the screw rod, and the screw rod gasket is located at one end of the return spring seat away from the piston. When the screw rod drives the return spring seat to move, the outer edge of the screw rod gasket abuts against the inner edge of the return spring seat along the radial direction of the screw rod, so that the return spring seat is stuck in the caliper body. When the piston is pushed out, the screw rod drives the return spring seat and the screw rod gasket to move. The outer edge of the screw rod gasket abuts against the inner edge of the return spring seat along the radial direction of the screw rod, and the screw rod gasket is stuck at the inner end of the return spring seat, avoiding the return spring seat from being pulled off, ensuring the reliability of the brake caliper during driving braking and parking braking, and improving parking safety.

Description

Technical Field

[0001] The present invention relates to the technical field of motor vehicle braking, and more particularly, to a parking brake caliper and an automobile. Background Art

[0002] The parking function of the rear disc brake of a motor vehicle is divided into a mechanical parking structure and an electronic parking structure. The mechanical parking structure is divided into a cam push rod type and a ball disc type parking. As shown in CN206072182U for the existing cam push rod type parking brake caliper, under the condition of high braking hydraulic pressure, due to the deformation of the brake caliper or the large space outside the piston of the brake caliper allowing the piston to be pushed out, the screw rod in the brake caliper drives the return spring seat to move, and the return spring seat will be pulled out of the brake caliper, which is called pull-off. The pull-off failure of the return spring seat will cause safety problems such as brake oil leakage and parking failure. Summary of the Invention

[0003] An object of the present invention is to provide a parking brake caliper and an automobile, which can effectively prevent the pull-off of the return spring seat.

[0004] Embodiments of the present invention are implemented as follows:

[0005] On the one hand, an embodiment of the present invention provides a parking brake caliper, which includes a caliper body, a piston arranged in the caliper body, a return spring seat arranged in the caliper body, and a screw rod with one end arranged in the piston and the other end passing through the return spring seat. A screw rod gasket is sleeved on the screw rod, and the screw rod gasket is located at one end of the return spring seat away from the piston. When the screw rod drives the return spring seat to move, the outer edge of the screw rod gasket and the inner edge of the return spring seat abut against each other along the radial direction of the screw rod, so that the return spring seat is stuck in the caliper body.

[0006] Optionally, one end of the return spring seat has a claw protruding outward, the caliper body has a card slot, the screw rod drives the return spring seat and the screw rod gasket to move away from the card slot, and the return spring seat is clamped in the card slot through the claw and abuts against the outer edge of the screw rod gasket.

[0007] Optionally, the axial cross-section of the return spring seat is trapezoidal, and the claw is located at the large end of the trapezoid.

[0008] Optionally, a boss is arranged on the inner hole side wall of the caliper body to form the card slot between the boss and the inner hole bottom wall of the caliper body, and the large end of the trapezoid and the end face of the boss abut against each other along the radial direction of the screw rod.

[0009] Optionally, a boss is arranged on the inner wall of the caliper body to form the card slot between the boss and the inner wall of the caliper body, and the large end of the trapezoid and the end face of the boss abut against each other along the axial direction of the screw rod.

[0010] Optionally, it further includes a screw sleeve, the screw sleeve is arranged inside the piston, the screw sleeve is in threaded fit with one end of the screw rod, and the piston is connected to the screw rod through the screw sleeve.

[0011] Optionally, a plain bearing and a screw sleeve gasket that fits against the plain bearing are further arranged inside the piston. The plain bearing and the screw sleeve gasket are located between the return spring seat and the screw sleeve, and the screw sleeve gasket is close to the return spring seat.

[0012] Optionally, it further includes a screw sleeve return spring. One end of the screw sleeve return spring abuts against the screw sleeve gasket, and the other end is arranged inside the piston.

[0013] Optionally, the caliper body, the piston, the screw rod, the return spring seat, and the screw rod gasket are coaxially arranged.

[0014] Another aspect of the embodiments of the present invention provides an automobile, including the above-mentioned parking brake caliper.

[0015] The beneficial effects of the embodiments of the present invention include:

[0016] For the parking brake caliper and the automobile provided by the embodiments of the present invention, when the piston is pushed out, the screw rod drives the return spring seat to move, and at the same time the screw rod gasket moves. The outer edge of the screw rod gasket abuts against the inner edge of the return spring seat along the radial direction of the screw rod. The screw rod gasket is stuck inside the end of the return spring seat, and the screw rod gasket pushes the return spring seat outwards, so that the return spring seat is stuck inside the caliper body. The radial contraction of the return spring seat is restricted by the screw rod gasket to prevent the end of the return spring seat from detaching from the inside of the caliper body, avoiding the return spring seat from being pulled off, ensuring the reliability of the brake caliper during parking braking, and improving parking safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 It is one of the structural schematic diagrams of the parking brake caliper provided by the embodiments of the present invention;

[0019] Figure 2 It is another structural schematic diagram of the parking brake caliper provided by the embodiments of the present invention;

[0020] Figure 3 It is yet another structural schematic diagram of the parking brake caliper provided by the embodiments of the present invention;

[0021] Figure 4 is Figure 3 the enlarged view of A in

[0022] Figure 5 is the schematic diagram of the pull-off of the return spring seat provided by the embodiment of the present invention.

[0023] Icon: 1 - pliers body; 11 - clamping groove; 12 - boss; 2 - piston; 3 - screw sleeve; 4 - plain bearing; 5 - screw sleeve gasket; 6 - screw sleeve return spring; 7 - return spring seat; 71 - claw; 8 - screw rod; 9 - screw rod return spring; 10 - screw rod gasket. Specific embodiments

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0026] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] The mechanical parking structure for parking the rear disc brake of a motor vehicle is divided into a cam push rod type and a ball disc type. The existing cam push rod type parking brake caliper is shown in CN206072182U. Under the condition of high braking hydraulic pressure, due to the deformation of the brake disc, brake pads and brake caliper, the piston push-out space increases, the piston moves forward, the screw sleeve return spring compresses and coils, and the screw sleeve rotates to compensate for the piston push-out stroke. However, since the piston push-out rate is higher than the screw sleeve rotation compensation rate, the hydraulic pressure continues to push the piston, the screw rod moves forward, and the screw sleeve return spring 6 and the screw rod return spring 9 compress and coil, resulting in the pull-off of the return spring seat. The pull-off failure of the return spring seat will cause safety problems such as brake oil leakage and parking failure.

[0028] Please refer to Figure 1, this embodiment provides a parking brake caliper. When the piston 2 is pushed out, the screw 8 drives the return spring seat 7 to move, and at the same time the screw gasket 10 moves. The outer edge of the screw gasket 10 abuts against the inner edge of the return spring seat 7 along the radial direction of the screw 8. In the state where the screw return spring 9 is in a compressed state, the screw gasket 10 is stuck at the inner end of the return spring seat 7, and the radial contraction of the return spring seat 7 is restricted by the screw gasket 10 to prevent the end of the return spring seat 7 from disengaging from the card slot 11 inside the caliper body 1, thus solving the problem of the return spring seat 7 being pulled off.

[0029] Specifically, this parking brake caliper includes a caliper body 1, a piston 2 provided inside the caliper body 1, a return spring seat 7 provided inside the caliper body 1, and a screw 8 with one end provided inside the piston 2 and the other end passing through the return spring seat 7. A screw gasket 10 is sleeved on the screw 8, and the screw gasket 10 is located at the end of the return spring seat 7 away from the piston 2. When the screw 8 drives the return spring seat 7 to move, the outer edge of the screw gasket 10 abuts against the inner edge of the return spring seat 7 along the radial direction of the screw 8, so that the return spring seat 7 is stuck inside the caliper body 1.

[0030] It should be noted that, first, a piston 2 and a return spring seat 7 are provided inside the caliper body 1, one end of the screw 8 is provided inside the piston 2, and the other end of the screw 8 passes through the return spring seat 7. Among them, the caliper body 1, the piston 2, the return spring seat 7, the screw 8 and the screw gasket 10 can be coaxially arranged, that is, the axes of the caliper body 1, the piston 2, the return spring seat 7, the screw 8 and the screw gasket 10 are all collinear. Collinearity can enable the synchronous movement of each part and has good working performance.

[0031] Second, a screw gasket 10 is sleeved on the screw 8, and the screw gasket 10 is located at the end of the return spring seat 7 away from the piston 2. When the piston 2 moves, it drives the screw 8 to move, and the return spring seat 7 moves accordingly. At the same time, the screw gasket 10 on the screw 8 also moves with the screw 8. When the screw 8 drives the return spring seat 7 to move, the outer edge of the screw gasket 10 abuts against the inner edge of the return spring seat 7 along the radial direction of the screw 8, and the screw gasket 10 pushes the return spring seat 7 outwards, restricting the radial ( Figure 3 in the Y direction) contraction of the return spring seat 7, so that the return spring seat 7 is stuck inside the caliper body 1.

[0032] The parking brake caliper provided by the embodiment of the present invention has the following structure: when the piston 2 is pushed out, the screw rod 8 drives the return spring seat 7 to move, and at the same time the screw washer 10 moves, and the outer edge of the screw washer 10 and the inner edge of the return spring seat 7 are radially abutted against each other along the screw rod 8, and the screw washer 10 is stuck in the inner end of the return spring seat 7. The screw washer 10 stretches the return spring seat 7 outward to limit the radial contraction of the return spring seat 7, so that the return spring seat 7 is stuck in the caliper body 1 to prevent the end of the return spring seat 7 from detaching from the inside of the caliper body 1 and the return spring seat 7 from being pulled off, thereby ensuring the reliability of the brake caliper during service braking and parking braking and improving parking safety.

[0033] Furthermore, one end of the return spring seat 7 has a claw 71 protruding outward, the caliper body 1 has a slot 11, the screw 8 drives the return spring seat 7 and the screw gasket 10 to move away from the slot 11, and the return spring seat 7 is clamped in the slot 11 by the claw 71 and abuts against the outer edge of the screw gasket.

[0034] The claw 71 acts like a gripper to "grasp" the slot 11, so that the return spring seat 7 has a force point to be stuck in the caliper body 1, and the return spring seat 7 can firmly grasp the slot to prevent the return spring seat 7 from being pulled off.

[0035] For example, the return spring seat 7 is a structure with one end open, the open end of the return spring seat 7 has a claw 71 protruding outward, and the caliper body 1 has a slot 11, such as Figure 2 In the initial assembly state, the screw gasket 10 and the claw 71 are both located in the slot 11, and the portion of the return spring seat 7 without the claw 71 is located outside the slot 11; Figure 3 As shown, when the screw rod 8 drives the return spring seat 7 and the screw gasket 10 to move away from the slot 11, that is, to the right, the claw 71 is stuck on the wall of the slot 11. At this time, the screw gasket 10 moves to the position of the claw 71, and the outer edge of the screw gasket abuts against the inner edge of the return spring seat 7. The screw gasket 10 pushes the return spring seat 7 outward to limit the radial contraction of the claw 71 of the return spring seat 7, so that the boss 12 of the slot 11 blocks the claw 71 from continuing to move to the right, and the return spring seat 7 is stuck in the slot 11 to prevent the return spring seat 7 from being pulled out of the slot 11.

[0036] For example, the axial cross-section of the return spring seat 7 is a trapezoid, and the claw 71 is located at the large end of the trapezoid, which is also the open end of the return spring seat 7, so that the screw gasket 10 can open the return spring seat 7 outward.

[0037] The trapezoidal structure is stable, and the return spring seat 7 can be stressed evenly, and the overall movement is stable. Meanwhile, the large end of the trapezoid is an open end, and after the large end is subjected to the holding force of the screw gasket 10, it is easy to open outwards, so that the claw 71 is clamped into the slot 11.

[0038] In addition, an inner hole is provided on the pliers body 1 in the axial direction, and the piston 2, the return spring seat 7, and the screw 8 are all arranged in this inner hole. A boss 12 is provided on the side wall of the inner hole, and a clamping groove 11 is formed between the boss 12 and the bottom wall of the inner hole. The large end of the trapezoid and the end face of the boss 12 abut against each other along the axial direction of the screw 8 ( Figure 3 in the X direction). As shown in Figure 4 , the outer edge of the screw gasket 10 abuts against the inner edge of the return spring seat 7 along the radial direction (Y direction) of the screw 8. The screw gasket 10 has a force to expand outward to expand the claw 71 outward (in the radial direction of the screw gasket 10), and the boss 12 blocks the claw 71. At the same time, the large end of the trapezoid, that is, the claw 71 and the end face of the boss 12 abut against each other along the axial direction (X direction) of the screw 8, so that the claw 71 is pressed against the end face of the boss 12, and the claw 71 is tightly clamped in the clamping groove 11. The screw gasket 10 abuts against the return spring seat 7 radially. The screw gasket 10 radially expands the claw 71 of the return spring seat 7 outward, and the claw 71 presses against the end face of the boss 12, so that the return spring seat 7 is firmly clamped in the clamping groove 11.

[0039] In this way, the situation where the return spring seat 7 is pulled out of the clamping groove 11 in Figure 5 is avoided: the screw gasket 10 does not abut against the claw 71. Therefore, when the return spring seat 7 moves to the right, there is no force applied to expand the claw 71 outward. The claw 71 "passes by" the boss 12, and the claw 71 moves to the right along the boss 12, causing the return spring seat 7 to be pulled out of the clamping groove 11, resulting in the return spring seat 7 being pulled off.

[0040] A screw return spring 9 is also sleeved on the screw 8. One end of the screw return spring 9 abuts against the screw gasket 10, and the other end abuts against the end of the return spring seat 7 away from the screw gasket 10.

[0041] In this way, in the compressed state of the screw return spring 9, the return spring seat 7 is limited, further preventing the end of the return spring seat 7 from detaching from the clamping groove 11 inside the pliers body 1.

[0042] This parking brake caliper further includes a screw sleeve 3, a plain bearing 4, a screw sleeve gasket 5, and a screw sleeve return spring 6. The screw sleeve 3 is arranged inside the piston 2. The screw sleeve 3 is in threaded cooperation with one end of the screw 8. The piston 2 is connected to the screw 8 through the screw sleeve 3. The screw sleeve 3 connects the piston 2 and the screw 8, and one end of the screw 8 can perform spiral movement inside the screw sleeve 3. A screw sleeve gasket 5 and a plain bearing 4 are also arranged inside the piston 2. The screw sleeve gasket 5 and the plain bearing 4 are arranged in a fitting manner. The plain bearing 4 and the screw sleeve gasket 5 are located between the screw sleeve return spring 6 and the screw sleeve 3. The screw sleeve gasket 5 is close to the screw sleeve return spring 6. One end of the screw sleeve return spring 6 abuts against the screw sleeve gasket 5, and the other end is arranged inside the piston 2. The screw 8 is threadedly connected to the screw sleeve 3. Due to the different thread profile angles, the clearance compensation of the piston 2 and the retention of the parking clamping force are realized, facilitating the compensation of the parking clearance.

[0043] When the parking brake is applied, the screw rod 8 moves forward while compressing the return spring 6 of the screw sleeve and the return spring 9 of the screw rod. When the parking brake is completed and the handbrake force is removed, the screw rod 8 moves backward translationally under the elastic force of the return spring 6 of the screw sleeve and the return spring 9 of the screw rod to achieve return, and the piston 2 moves backward, thereby releasing the braking force.

[0044] An embodiment of the present invention also discloses an automobile, including the parking brake caliper of any one of the above. This automobile has the same structure and beneficial effects as the parking brake caliper in the foregoing embodiment. The structure and beneficial effects of the parking brake caliper have been described in detail in the foregoing embodiment and will not be repeated here.

[0045] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A parking brake caliper, characterized in that, It includes a clamp body, a piston arranged in the clamp body, a return spring seat arranged in the clamp body, and a screw rod with one end arranged in the piston and the other end passing through the return spring seat. A screw rod gasket is sleeved on the screw rod, and the screw rod gasket is located at one end of the return spring seat away from the piston. When the screw rod drives the return spring seat to move, the outer edge of the screw rod gasket abuts against the inner edge of the return spring seat along the radial direction of the screw rod, so that the return spring seat is clamped in the clamp body; One end of the return spring seat has a claw protruding outward, the clamp body has a clamping groove, the screw rod drives the return spring seat and the screw rod gasket to move away from the clamping groove, and the return spring seat is clamped in the clamping groove through the claw and abuts against the outer edge of the screw rod gasket; The axial cross-section of the return spring seat is trapezoidal, and the claw is located at the large end of the trapezoid; A convex platform is arranged on the inner wall of the clamp body to form the clamping groove between the convex platform and the inner wall of the clamp body, and the large end of the trapezoid abuts against the end face of the convex platform along the axial direction of the screw rod.

2. The parking brake caliper according to claim 1, characterized in that, It also includes a screw rod return spring sleeved on the screw rod. One end of the screw rod return spring abuts against the screw rod gasket, and the other end abuts against the end of the return spring seat away from the screw rod gasket.

3. The parking brake caliper according to claim 1, characterized in that, It also includes a screw sleeve. The screw sleeve is arranged in the piston, and the screw sleeve is in threaded cooperation with one end of the screw rod. The piston is connected to the screw rod through the screw sleeve.

4. The parking brake caliper according to claim 3, characterized in that, A plain bearing and a screw sleeve gasket attached to the plain bearing are also arranged in the piston. The plain bearing and the screw sleeve gasket are located between the return spring seat and the screw sleeve, and the screw sleeve gasket is close to the return spring seat.

5. The parking brake caliper according to claim 4, characterized in that, It also includes a screw sleeve return spring. One end of the screw sleeve return spring abuts against the screw sleeve gasket, and the other end is arranged in the piston.

6. The parking brake caliper according to claim 1, characterized in that, The clamp body, the piston, the screw rod, the return spring seat and the screw rod gasket are coaxially arranged.

7. A vehicle, characterized in that, It includes the parking brake caliper according to any one of claims 1 to 6.

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