Anti-drag structure of automobile brake caliper

Abstract

The present invention relates to an anti-drag structure for automobile brake calipers, belonging to the technical field of automobile brakes, and comprising a brake caliper body, a cylinder hole being provided on the brake caliper body, and a brake claw being provided along the axis of the cylinder hole; a cylindrical piston sleeve being press-fitted in the cylinder hole by interference fit, a step ring groove being provided on the inner wall of the piston sleeve, the step ring groove being composed of a large diameter ring groove and a small diameter ring groove with a rectangular cross section, a rubber sealing ring with a cross section corresponding to the large diameter ring groove being embedded in the large diameter ring groove, a phenolic resin PF ring with a cross section corresponding to the small diameter ring groove being embedded in the small diameter ring groove, and a chamfer being provided on the inner edge of the end face where the phenolic resin PF ring and the rubber sealing ring are attached. The present invention can improve the versatility of the brake caliper body and improve the standardization of the production and manufacturing of the brake caliper by providing the piston sleeve; the use of the rubber sealing ring and the phenolic resin PF ring can reduce the residual drag torque of the brake caliper, reduce fuel consumption, and achieve the purpose of emission reduction.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile braking, and in particular relates to an anti-drag structure of an automobile brake caliper. Background Art

[0002] Brake calipers are mostly used on car disc brakes. When in use, different brake cylinder diameters need to be matched according to different vehicle parameters. However, at present, automobile technology is developing in the direction of low emissions and high performance. The vehicle parameters of most cars are different, resulting in different brake cylinder diameters of automobile brake calipers, which makes the specifications of automobile brake calipers more and more, inconvenient to manufacture and high cost.

[0003] In addition, with the development, the requirements for residual drag torque of automobile brakes are getting higher and higher. The traditional design scheme cannot meet the performance requirements of automobile brake drag torque exceeding 3Mpa hydraulic conditions and meet the more stringent requirements of required fluid volume and drag torque. The traditional design scheme faces the low drag requirements caused by the diversification of brake caliper cylinder diameter specifications and increasingly stringent emission requirements, which causes the development costs of automobile brake suppliers to rise, and the development risks also rise accordingly.

[0004] Nowadays, automobiles have further developed in the direction of platformization, unification and low emissions; optimizing the structure of automobile brake calipers, improving automobile brake performance, reducing automobile drag torque to reduce fuel consumption, and further shortening the automobile development cycle and reducing product management risk models, reducing costs and increasing efficiency has become imperative. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an anti-drag structure for an automobile brake caliper, so as to avoid the problem of inconvenient standardization of specifications and high drag torque under high hydraulic conditions, thereby achieving the effect of improving versatility and reducing emissions.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The anti-drag structure of automobile brake caliper includes a brake caliper body, a cylinder hole is formed on the brake caliper body, and the brake caliper body also has a brake claw extending along the axis of the cylinder hole; a cylindrical piston sleeve is press-fitted in the cylinder hole by interference fit, and a step ring groove is formed on the inner wall of the piston sleeve, and the step ring groove consists of a large-diameter ring groove and a small-diameter ring groove with a rectangular cross-section, a rubber sealing ring with a corresponding cross-section is embedded in the large-diameter ring groove, and a phenolic resin PF ring with a corresponding cross-section is embedded in the small-diameter ring groove, and the inner edge of the end face of the phenolic resin PF ring in contact with the rubber sealing ring is also chamfered.

[0008] Furthermore, the brake caliper body is an aluminum alloy part, and an anodized layer is attached to the outer surface of the brake caliper body.

[0009] Furthermore, the step ring groove is formed at one end of the piston sleeve close to the brake claw, and the small diameter ring groove in which the phenolic resin PF ring is embedded is located at one side of the step ring groove close to the brake claw.

[0010] Furthermore, the phenolic resin PF ring has an assembly opening that separates the circumferentially continuous phenolic resin PF ring to facilitate assembly.

[0011] The beneficial effects of the present invention are:

[0012] 1. The anti-drag structure of the automobile brake caliper of the present invention improves the versatility of the brake caliper body by setting the piston sleeve. When facing the needs of different cylinder diameters, the brake caliper body can be universal, and only needs to replace the piston sleeve with different inner diameter sizes, thereby improving the unification and platformization of the production and manufacturing of the brake caliper body, thereby reducing costs.

[0013] 2. The anti-drag structure of the automobile brake caliper of the present invention uses a rubber sealing ring made of rubber that can be elastically deformed under pressure, and a phenolic resin PF ring made of a phenolic resin material with high hydraulic sensitivity under high pressure. The phenolic resin PF ring has the characteristics of stability at low hydraulic pressure and linear step when the pressure reaches a high hydraulic pressure critical value. It is stable at low pressure and achieves high-slope compression at high hydraulic pressure exceeding, for example, 30 bar. When in use, the elastic potential energy of the rubber sealing ring can be stored through the chamfer of the end face that is in contact with the rubber sealing ring. Under high hydraulic conditions, the material properties are triggered, the phenolic resin PF ring is linearly compressed, and it undergoes a step-like elastic deformation, which can increase the deformation of the rubber sealing ring and store more elastic potential energy of the rubber sealing ring, thereby reducing the residual drag torque of the automobile brake, reducing fuel consumption, and achieving the purpose of emission reduction.

[0014] 3. The anti-drag structure of the automobile brake caliper of the present invention is combined with a piston sleeve made of a high-strength aluminum alloy and anodized to improve wear resistance, which is beneficial to increasing the life and safety of the brake caliper and facilitating lightweight design.

[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 1It is a structural schematic diagram of an anti-drag structure of a vehicle brake caliper according to a specific embodiment;

[0018] Figure 2 is a schematic diagram of a single body of a brake caliper body in a specific embodiment;

[0019] Figure 3 It is a schematic diagram of the assembly of the piston sleeve and internal assembly parts in a specific embodiment;

[0020] Figure 4 is a single body schematic diagram of a piston sleeve in a specific embodiment;

[0021] Figure 5 Schematic diagram of a monomer of a phenolic resin PF ring in a specific embodiment;

[0022] Figure 6 for Figure 5 Left view of .

[0023] Reference numerals:

[0024] Brake caliper body 1, cylinder hole 11, brake claw 12, step hole 13, piston sleeve 2, step ring groove 21, large diameter ring groove 22, small diameter ring groove 23, phenolic resin PF ring 3, chamfer 31, assembly opening 32, rubber sealing ring 4. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] See also Figure 1 to Figure 6 The anti-drag structure of the automobile brake caliper includes a brake caliper body 1, a cylinder hole 11 is formed on the brake caliper body 1, and the brake caliper body 1 also has a brake claw 12 extending along the axis of the cylinder hole 11; the structure of the brake caliper body 1 is the prior art, and it can be understood that the end of the cylinder hole 11 away from the brake claw 12 on the brake caliper body 1 also has a stepped small hole 13 coaxial with the cylinder hole 11 for passing a piston rod, and a cylindrical piston sleeve 2 is press-fitted in the cylinder hole 11 by interference fit, and the piston A step ring groove 21 is provided on the inner wall of the sleeve 2, and the step ring groove 21 consists of a large diameter ring groove 22 and a small diameter ring groove 23, both of which have rectangular cross-sections. A rubber sealing ring 4 with a corresponding cross-section is embedded in the large diameter ring groove 22, that is, the cross-section of the rubber sealing ring 4 is also rectangular, and a phenolic resin PF ring 3 with a corresponding cross-section is embedded in the small diameter ring groove 23. The inner edge of the end face of the phenolic resin PF ring 3 that is in contact with the rubber sealing ring 4 is also provided with a chamfer 31 to make its cross-section present a shape similar to a right-angled trapezoid.

[0029] The anti-drag structure of the automobile brake caliper of the embodiment improves the versatility of the brake caliper body 1 by setting the piston sleeve 2. When facing the needs of different cylinder diameters, the brake caliper body 1 can be universal, and only needs to replace the piston sleeve 2 with different inner diameters (same outer diameter) (correspondingly, the rubber seal ring 4 and the phenolic resin PF ring 3 should also be replaced simultaneously), thereby improving the unification and platformization of the production and manufacturing of the brake caliper body 1, thereby reducing the cost; at the same time, the rubber seal ring 4 made of rubber that can be elastically deformed under pressure and the phenolic resin PF ring 3 made of phenolic resin (Bakelite) material with high hydraulic sensitivity under high pressure are used. The grease PF ring 3 has the characteristics of stability at low hydraulic pressure and linear step when the pressure reaches the critical value of high hydraulic pressure. It is stable at low pressure and reaches high slope compression when the high hydraulic pressure exceeds 30 bar, for example. When in use, the chamfer 31 of the end face that is in contact with the rubber seal ring 4 can store the elastic potential energy of the rubber seal ring 4. Under high hydraulic conditions, the material properties are triggered, and the phenolic resin PF ring 3 is linearly compressed, and the phenolic resin PF ring 3 undergoes a step-like elastic deformation, which can increase the deformation of the rubber seal ring 4 and store more elastic potential energy of the rubber seal ring 4, thereby reducing the residual drag torque of the automobile brake, reducing fuel consumption, and achieving the purpose of emission reduction. To a certain extent, it solves the current problem of the balance performance between the required fluid volume and the drag torque of the automobile brake caliper under high hydraulic conditions.

[0030] The brake caliper body 1 is a high-strength aluminum alloy part, and an anodized layer (not shown in the figure) is attached to the outer surface of the brake caliper body 1.

[0031] In this way, the automobile brake caliper uses a piston sleeve 2 made of high-strength aluminum alloy through anodizing treatment to improve wear resistance, which is beneficial to improving the life and safety of the brake caliper and is beneficial to lightweight and standardized design.

[0032] Among them, the step ring groove 21 is opened at one end of the piston sleeve 2 close to the brake claw 12, and the small-diameter ring groove 23 in which the phenolic resin PF ring 3 is embedded is located in the step ring groove 21 (compared to the large-diameter ring groove 22) on the side close to the brake claw 12 to better ensure the functional effect; the phenolic resin PF ring 3 has an assembly opening 32 that disconnects the circumferentially continuous phenolic resin PF ring 3 to facilitate assembly.

[0033] In this way, during assembly, the parts can be staggered through the assembly opening 32 and rebound to return to a full circle after being inserted into the small-diameter annular groove 23, which facilitates assembly.

[0034] 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. An anti-drag structure for a brake caliper of an automobile, comprising a brake caliper body, a cylinder hole being formed on the brake caliper body, and a brake claw extending along the axis of the cylinder hole; characterized in that: A cylindrical piston sleeve is press-fitted into the cylinder hole with an interference fit, and a step ring groove is provided on the inner wall of the piston sleeve. The step ring groove consists of a large-diameter ring groove and a small-diameter ring groove with rectangular cross-sections. A rubber sealing ring with a corresponding cross-section is embedded in the large-diameter ring groove, and a phenolic resin ring with a corresponding cross-section is embedded in the small-diameter ring groove. The inner edges of the end faces of the phenolic resin ring and the rubber sealing ring that are in contact are also chamfered.

2. The anti-drag structure for automobile brake calipers according to claim 1, characterized in that: The brake caliper body is an aluminum alloy part, and an anodized layer is attached to the outer surface of the brake caliper body.

3. The anti-drag structure for automobile brake calipers according to claim 1, characterized in that: The step ring groove is arranged at one end of the piston sleeve close to the brake claw, and the small diameter ring groove in which the phenolic resin ring is embedded is located at one side close to the brake claw in the step ring groove.

4. The anti-drag structure for automobile brake calipers according to claim 1, characterized in that: The phenolic resin ring has an assembly opening which breaks the phenolic resin ring which is continuous in the circumferential direction, so as to facilitate assembly.

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