A force-enhancing automobile brake caliper

Abstract

The present invention relates to a force-enhancing automobile brake caliper, which belongs to the field of automobile brake technology, and comprises a caliper body, one end of which is provided with an outer brake block, and the other end is formed with a piston cylinder inside, a piston is slidably connected in the piston cylinder, an inner brake block is provided at the output end of the piston, and the angle between the pressure of the piston acting on the inner brake block and the pressure of the brake disc acting on the inner brake block is A, 5°≤A≤30°. The present invention increases the braking force of the piston on the brake disc by making the piston cylinder inclined, and realizes that a large-sized brake caliper in the prior art can be replaced by a small-sized brake caliper without adding additional parts, thereby realizing a lightweight design of the brake caliper.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile brakes and relates to a force-boosting automobile brake caliper. Background Art

[0002] At present, with the promotion of new energy vehicles, major OEMs have increasingly stringent requirements on vehicle performance and cost. Therefore, while meeting performance requirements, lightweight design has become an important design goal. As an important component of a car, the weight and cost of the brake caliper have also become one of the focuses of attention of automobile manufacturers. Existing brake calipers mostly use disc brake calipers, whose brake piston cylinders are arranged along the normal direction of the end face of the brake disc. The positive pressure of the brake disc on the inner brake pad is equal to the equivalent pressure of the piston on the inner brake pad under the dynamic hydraulic pressure. In order to obtain a larger braking force, a larger cylinder diameter is required, resulting in a large volume and heavy weight of the brake caliper. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a force-boosting automobile brake caliper to increase the braking force of the piston on the brake disc, thereby achieving a lightweight design of the brake caliper.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A force-amplifying automobile brake caliper comprises a caliper body, one end of the caliper body is provided with an outer brake pad, the other end is formed with a piston cylinder inside, a piston is slidably connected inside the piston cylinder, an inner brake pad is provided at the output end of the piston, the angle between the pressure of the piston acting on the inner brake pad and the pressure of the brake disc acting on the inner brake pad is A, 5°≤A≤30°.

[0006] Optionally, 15°≤A≤20°.

[0007] Optionally, a sealing groove that acts on a piston sealing ring mounted on the piston is formed on the inner wall of the piston cylinder, and the axial cross-section of the sealing groove includes a bottom surface, and a front side surface and a rear side surface located at the front end and rear end of the bottom surface respectively, and the bottom surface of the sealing groove includes a first bottom surface connected to the front side surface and parallel to the axis of the piston cylinder, a second bottom surface that is not parallel to the axis of the piston cylinder and whose included angle C is an acute angle, and a V-shaped surface connecting the first bottom surface and the second bottom surface, and the aperture corresponding to the first bottom surface is smaller than the average aperture corresponding to the second bottom surface, so that the interference fit between the piston sealing ring and the first bottom surface is greater than the interference fit with the second bottom surface.

[0008] Optionally, 7.5°≤C≤10.5°.

[0009] Optionally, the front side surface includes a front end inclined surface having an angle B with the radial surface of the piston cylinder, and a front vertical surface connected to the front end inclined surface, and the other end of the front vertical surface is connected to the first bottom surface.

[0010] Optionally, the rear side surface includes a rear end inclined surface having an angle D with the radial surface of the piston cylinder, and a rear vertical surface connected to the rear end inclined surface, and the other end of the rear vertical surface is connected to the first bottom surface.

[0011] Optionally, the area of ​​the front end inclined surface is larger than the area of ​​the rear end inclined surface.

[0012] The beneficial effects of the present invention are:

[0013] 1. The present invention tilts the piston cylinder so that it has a greater braking force on the brake disc than the piston cylinder arranged along the normal direction of the end surface of the brake disc in the prior art, thereby achieving the braking force of a large piston generated by a small piston, thereby achieving the replacement of the large-sized brake caliper in the prior art with a small-sized brake caliper without adding additional parts, thereby achieving a lightweight design of the brake caliper.

[0014] 2. The present invention does not require additional parts and components. Low hydraulic braking can be achieved by simply changing the structure of the sealing groove, and the braking response is fast, thereby improving driving safety and comfort.

[0015] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 Schematic diagram of the brake caliper structure Figure 1 ;

[0018] Figure 2 Schematic diagram of the brake caliper structure Figure 2 ;

[0019] Figure 3 Schematic diagram of the force on the inner brake pad;

[0020] Figure 4 Schematic diagram of the brake caliper structure Figure 3 ;

[0021] Figure 5 It is a structural schematic diagram of the clamp body;

[0022] Figure 6 for Figure 5 A partial enlarged view of point F.

[0023] Reference numerals: piston 1 , caliper body 2 , piston sealing ring 3 , inner brake pad 4 , brake disc 5 , outer brake pad 6 , bracket 7 , front end inclined surface 11 , first bottom surface 12 , second bottom surface 13 , rear end inclined surface 14 . DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] See also Figure 1 to Figure 6 A force-enhancing automobile brake caliper comprises a caliper body 2, one end of the caliper body 2 is provided with an outer brake pad 6, and the other end is formed with a piston cylinder inside, a piston 1 is slidably connected in the piston cylinder, and an inner brake pad 4 that can fit therewith is provided at the output end of the piston 1; the piston cylinder is arranged obliquely, and the angle between the axis of the piston cylinder and the end surface normal of the brake disc 5 is A, so that the angle between the end surface normal of the inner brake pad 4 facing the piston 1 and the end surface normal of the brake disc 5 is also A, so that the angle between the pressure of the piston 1 acting on the inner brake pad 4 and the pressure of the brake disc 5 acting on the inner brake pad 4 can be A, and the range of A is 5°≤A≤30°.

[0028] Figure 3The force analysis diagram of the inner brake pad 4 is shown in FIG. The inner brake pad 4 is taken as the research object. From the force balance of the inner brake pad 4 in the y direction, it can be concluded that:

[0029]

[0030] In the formula, μ is the friction coefficient; F is the equivalent hydraulic pressure acting on the inner brake pad 4 by the piston 1, N is the positive pressure exerted on the inner brake pad 4, A is the angle between the axis of the piston cylinder and the end surface normal of the brake disc 5; Fz is the reaction force exerted by the bracket 7 on the brake pad.

[0031] In the prior art, the positive pressure of the brake disc on the inner brake pad is equal to the equivalent pressure of the piston on the inner brake pad under the dynamic hydraulic pressure, and the braking force of the car is proportional to the square of the piston radius. However, in the present invention, the positive pressure N on the inner brake pad 4 is greater than the equivalent pressure F of the piston 1 on the inner brake pad 4 under the dynamic hydraulic pressure. Therefore, the brake caliper in the present invention can achieve the braking force under the condition of large piston diameter by using a small piston diameter, and can completely replace the brake caliper under large cylinder diameter. The weight of the brake caliper is positively correlated with the piston diameter. Therefore, the brake caliper of the present invention can achieve the goal of lightweight design.

[0032] The piston cylinder of the present invention is arranged at an angle, and has a greater braking force on the brake disc than the piston cylinder arranged along the normal direction of the end surface of the brake disc in the prior art, thereby achieving the braking force of a large piston generated by a small piston, thereby achieving the replacement of the large-sized brake caliper in the prior art with a small-sized brake caliper without adding additional parts.

[0033] Preferably, 15°≤A≤20°.

[0034] The inner wall of the piston cylinder of the present invention is provided with a sealing groove for acting with the piston sealing ring sleeved on the piston. The axial section of the sealing groove includes a bottom surface, and a front side surface and a rear side surface located at the front end and the rear end of the bottom surface respectively. The bottom surface of the sealing groove includes a first bottom surface 12 connected to the front side surface and parallel to the axis of the piston cylinder, a second bottom surface 13 which is not parallel to the axis of the piston cylinder and whose angle C is an acute angle, and a V-shaped surface connecting the first bottom surface 12 and the second bottom surface 13. The aperture corresponding to the first bottom surface 12 is smaller than the average aperture corresponding to the second bottom surface 13, so that the interference amount of the piston sealing ring 3 with the first bottom surface 12 is greater than the interference amount of the piston sealing ring 3 with the second bottom surface 13. The range of C is: 7.5°≤C≤10.5°, preferably C=8°.

[0035] In order to reduce stress concentration, the junction between the first bottom surface 12 and the front side surface, and the junction between the second bottom surface 13 and the rear side surface in the present invention both have chamfer structures.

[0036] The front side surface of the sealing groove in the present invention includes a front inclined surface 11 with an angle B with the piston cylinder radial surface, and a front vertical surface connected to the front inclined surface 11, and the other end of the front vertical surface is connected to the first bottom surface 12. The range of B is: 25°≤B≤35°, preferably B=30°.

[0037] The rear side surface of the sealing groove in the present invention includes a rear end inclined surface 14 with an angle D with the piston cylinder radial surface, and a rear vertical surface connected to the rear end inclined surface 14, and the other end of the rear vertical surface is connected to the first bottom surface 12. The range of D is: 32°≤D≤42°, preferably D=37°.

[0038] Preferably, in the present invention, the area of ​​the front end inclined surface 11 is larger than the area of ​​the rear end inclined surface 14 .

[0039] The sealing groove of the present invention is arranged corresponding to the position of the piston sealing ring 3, generally close to one end of the cylinder port of the piston cylinder.

[0040] Example

[0041] A force-amplifying automobile brake caliper comprises a bracket 7, a piston 1, a caliper body 2, a piston sealing ring 3, an inner brake pad 4, a brake disc 5, an outer brake pad 6 and a piston dust cover. An outer brake pad is arranged at one end of the caliper body, and a piston cylinder is formed on the inner side of the other end. The piston cylinder is arranged obliquely, and an angle A=15° is formed between the axis of the piston cylinder and the end surface normal of the brake disc 5. The angle between the end surface normal of the inner brake pad facing the piston and the end surface normal of the brake disc 5 is A. The inner brake pad cooperates with the output end surface of the piston so that the angle between the pressure of the piston acting on the inner brake pad and the pressure of the brake disc acting on the inner brake pad is A.

[0042] The caliper body 1 is connected to the bracket 7 through a guide pin, the piston 1 is slidably arranged in the piston cylinder of the caliper body 1, the piston seal ring 3 is sleeved on the outside of the piston 1 and is located in the seal groove opened on the inner wall of the piston cylinder, and the piston dust cover is located on the side of the piston seal ring 3 close to the cylinder port of the piston cylinder. The axial section of the seal groove includes a bottom surface, and a front side surface and a rear side surface located at the front end and rear end of the bottom surface respectively. The bottom surface of the seal groove includes a first bottom surface 12 connected to the front side surface and parallel to the axis of the piston cylinder, a second bottom surface 13 that is not parallel to the axis of the piston cylinder and whose angle C is an acute angle, and a V-shaped surface connecting the first bottom surface 12 and the second bottom surface 13, C = 8°. The front side surface of the seal groove includes a front end inclined surface 11 with an angle B with the radial surface of the piston cylinder, and a front vertical surface connected to the front end inclined surface 11, and the other end of the front vertical surface is connected to the first bottom surface 12, B = 30°. The rear side surface of the sealing groove includes a rear end inclined surface 14 with an angle D with the piston cylinder radial surface, and a rear vertical surface connected to the rear end inclined surface 14, and the other end of the rear vertical surface is connected to the first bottom surface 12, D = 37 degrees. The area of ​​the front end inclined surface 11 is larger than the area of ​​the rear end inclined surface 14.

[0043] The cross section of the piston seal ring 3 is rectangular and made of rubber. The piston seal ring 3 can be deformed under the pressure of the hydraulic pressure, air pressure or other power device on the piston 1. Under the action of the brake fluid, the piston 1 moves from the bottom of the cylinder hole of the piston cylinder of the brake caliper to the claw of the brake caliper and generates axial pressure. This axial pressure presses the brake block to make the brake block and the brake disc rub to generate braking force, so that the piston seal ring 3 moves to the claw end of the brake caliper. Since the interference amount of the piston seal ring 3 at the first bottom surface 12 with the piston 1 is greater than the interference amount of the piston seal ring 3 at the second bottom surface 13, the piston seal ring 3 is not easy to deform under the action of pre-pressure, so only a small amount of brake fluid is needed to generate the braking force to achieve braking. Therefore, the brake fluid required by the present invention is low and the braking response is fast.

[0044] The present invention does not require additional parts. By optimizing the angle between the center line of the piston cylinder hole and the normal line to the end surface of the brake disc, the braking force under the large piston can be generated by a small piston, and the braking force effect of the large piston cylinder can be generated by the small piston cylinder. Therefore, the large piston brake caliper can be replaced by a small piston brake caliper, which can well meet the weight requirements and achieve the purpose of lightweight without affecting the performance in various aspects. In addition, without adding additional parts, low hydraulic braking can be achieved by only changing the structure of the sealing groove, and the braking response is fast, which improves the safety and comfort of driving.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A force-enhancing automobile brake caliper, comprising a caliper body, one end of which is provided with an outer brake pad, and the other end of which is formed with a piston cylinder inside, a piston slidably connected in the piston cylinder, and an inner brake pad is provided at the output end of the piston, characterized in that: The angle between the pressure of the piston on the inner brake pad and the pressure of the brake disc on the inner brake pad is A, and the range of A is 5°≤A≤30°; A sealing groove for acting with a piston sealing ring sleeved on the piston is provided on the inner wall of the piston cylinder, the axial section of the sealing groove includes a bottom surface, and a front side surface and a rear side surface respectively located at the front end and the rear end of the bottom surface, the bottom surface of the sealing groove includes a first bottom surface connected to the front side surface and parallel to the axis of the piston cylinder, a second bottom surface which is not parallel to the axis of the piston cylinder and whose included angle C is an acute angle, 7.5°≤C≤10.5°, and a V-shaped surface connecting the first bottom surface and the second bottom surface, and the aperture corresponding to the first bottom surface is smaller than the average value of the aperture corresponding to the second bottom surface, so that the interference amount of the piston sealing ring with the first bottom surface is greater than the interference amount of the piston sealing ring with the second bottom surface; The front side surface includes a front end inclined surface with an angle of B with the radial surface of the piston cylinder, and a front vertical surface connected to the front end inclined surface, and the other end of the front vertical surface is connected to the first bottom surface; the rear side surface includes a rear end inclined surface with an angle of D with the radial surface of the piston cylinder, and a rear vertical surface connected to the rear end inclined surface, and the other end of the rear vertical surface is connected to the second bottom surface; the area of ​​the front end inclined surface is larger than the area of ​​the rear end inclined surface.

2. The force-amplifying automobile brake caliper according to claim 1, characterized in that: 15°≤A≤20°。

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