CN214617605U - Aluminum matrix composite material ventilation brake disc for automobile - Google Patents

Abstract

The utility model relates to an aluminium base composite material ventilation brake disc for car, this brake disc adopt SiCp/A356 aluminium base composite material to form through antigravity casting method preparation, including first working disc (10), second working disc (20), splice bar (30), installation department (40) and arc connecting portion (50), first working disc and second working disc pass through splice bar fixed connection, the inboard braking surface (11) of first working disc and the outside braking surface (21) parallel arrangement of second working disc, the installation department passes through arc connecting portion and second working disc fixed connection. The utility model discloses a brake disc compares brake disc of grey cast iron material can realize subtracting more than the heavy 50%, because the higher heat-conduction ability of this material and heat storage capacity, can reduce the friction temperature rise of brake disc simultaneously to homogenization brake disc temperature distribution avoids forming big thermal stress in the brake disc, prevents that the crackle from sprouting and expanding.

Description

Aluminum matrix composite material ventilation brake disc for automobile

Technical Field

The utility model belongs to the technical field of the car brake disc is relevant, in particular to adopt aluminium base combined material's light long-life ventilation brake disc for car.

Background

The braking system of the automobile is very important to the driving safety, and the braking system has the function of decelerating and stopping the running automobile. The operating principle of the brake system is to convert the kinetic energy of the vehicle into heat energy by friction.

The brakes of the automobile braking system mainly comprise a drum type brake and a disc type brake. Among them, the disc brake is open, the heat generated in the braking process can be quickly dissipated, and the disc brake has good braking efficiency and is widely applied to automobiles at present.

The brake disc of the disc brake is a disc-shaped component with an end plane as a friction working surface. The brake disc can be divided into a solid disc (single disc) and a ventilation disc (double disc) according to the structure. The automobile is driven by air convection at the air duct, so that the aim of heat dissipation is fulfilled, the brake disc can be prevented from being overheated, the thermal attenuation is reduced, the service life is prolonged, and better braking performance is provided. The channel design inside the ventilating disc comprises a straight channel, a bent channel, a strut-type channel and the like.

The contribution of the reduction of the unsprung mass of the automobile to the light weight of the automobile, energy conservation and emission reduction is the most obvious, and meanwhile, the control performance of the automobile is also favorably improved. Since a brake disc is one of the core components that can effectively reduce the weight of a vehicle, it is necessary to develop a lightweight brake disc for an automobile.

At present, the mainstream automobile brake disc material mainly comprises gray cast iron, the typical mark is HT250, but the weight of the steel material is larger, and the trend of energy conservation, emission reduction and light weight of the automobile is not met.

At present, the lightweight brake disc material can be mainly used in two types: the first is C/C composite material or C/C-SiC composite material; another class is particle, whisker or fiber reinforced metal matrix composites. Both materials have good lightweight characteristics. However, the main problems of the C/C-SiC material are that the manufacturing process is complex, the cost is high, and the preparation and the forming are to be further improved. The preparation method of the particle reinforced metal matrix composite material comprises a powder metallurgy method, a stirring casting method and the like. The SiC particle reinforced aluminum matrix composite material prepared by the powder metallurgy method has limitation on the structural complexity or flexibility of a workpiece, and the cost of material preparation and workpiece forming is high. In recent years, the stirring casting method is developed to prepare the SiCp/A356 composite material, namely the silicon carbide particle reinforced aluminum matrix composite material.

The SiCp/A356 aluminum-based composite material has the advantages of high specific strength and specific stiffness, good thermal conductivity, high heat capacity, good wear resistance and the like, and compared with a C/C-SiC composite material, the SiCp/A356 aluminum-based composite material has the advantages of relatively simple material preparation and forming process and obvious cost advantage. The SiC-particle-reinforced SiCp/A356 aluminum-based composite material is selected as a lightweight automobile brake disc material, so that the weight of the brake disc is expected to be reduced by 30-50%, the service life can be prolonged, the application cost can be reduced, the safety and reliability can be improved, the noiseless green braking can be realized, and the SiC-particle-reinforced SiCp/A356 aluminum-based composite material is particularly suitable for new energy automobile brake discs. Of course, compared with the traditional steel material, the SiCp/a356 aluminum-based composite material also has the problems of low melting point, large expansion coefficient, poor liquid fluidity and the like, thereby causing the problems of being incapable of bearing higher friction braking temperature, higher thermal stress and the like. In addition, when cast molding is employed, well-designed sequential solidification processes also need to be considered.

Through searching the prior art, Chinese patent CN 209067715U 'an automobile brake disc' provides an air duct design that is spirally distributed along the circumference of a working part, can promote ventilation efficiency, reduces the temperature of the brake disc, and reduces weight through reducing the thickness of the disc body, thereby realizing light weight. Several problems with this solution include: the weight reduction effect achieved by reducing the thickness of the plate body is limited, and the heat storage capacity of the material is not favorably exerted; the design of the spiral radiating air duct ensures that the air flow rate difference and the heat exchange coefficient difference of different parts of the brake disc are large, so that the temperature difference and the temperature uniformity of different parts of the brake disc are large, and large thermal stress is easily formed to cause thermal cracking; moreover, the dense spiral air duct is not easy to cast and form and is difficult to clean.

Chinese patent CN 207034033U, "a ventilated type automobile brake disc", discloses an automobile brake disc with inner ring ventilation block, middle ring ventilation block and outer ring ventilation block structural design, the ventilation block is used for improving the radiating effect, reduces the brake disc temperature. The ventilation block design of the technical scheme is very distinctive, but the light weight scheme is not provided.

Chinese patent CN 210397521U "a light-weight type car brake disc" focuses on clean subassembly and radiator unit, clears up mud stain in real time through clean subassembly, makes the brake disc keep normal heat dissipation always, improves the radiating effect of brake disc through radiator unit. This technical scheme relates to the subassembly more, and the structure is complicated, is unfavorable for using widely.

Chinese patent CN 105525153A, "a silicon carbide particle reinforced aluminum matrix composite brake disc", discloses a silicon carbide particle reinforced aluminum matrix composite and a preparation method thereof, and also provides a brake disc for rail transit vehicles, which is manufactured based on the composite. The technical scheme does not relate to the brake disc for the automobile, and can not be directly used for the automobile brake disc with small size and different braking working conditions.

Chinese patent CN 111442039A 'a light wear-resistant aluminum-based powder metallurgy composite material automobile brake disc and a preparation method thereof' discloses a brake disc composed of an aluminum-based structural material disc body and a wear-resistant aluminum-based composite material friction surface and a preparation method of the material. The material is prepared by adopting the powder metallurgy principle, and simultaneously achieves the effects of wear resistance and weight reduction. However, the powder metallurgy method has the problems of complex process and high manufacturing cost, is not suitable for large-scale industrial production, and is difficult to produce good economic benefit. In particular, a certain amount of powder materials such as iron or copper and the like are added in the preparation of the composite material to improve the performance of the brake disc made of the powder metallurgy composite material, and although surface protection treatment measures are adopted in the patent, the materials are easy to form a galvanic cell with aluminum powder or aluminum phase in the service process to generate electrochemical corrosion, the service life of the brake disc is shortened, and the service safety is influenced.

Based on this, the utility model is especially provided.

SUMMERY OF THE UTILITY MODEL

Under the condition of meeting the requirements of structures and sizes of automobile brake disc interfaces and the like, the aluminum-based composite material brake disc structure is designed, so that the thermal capacity (brake temperature rise and thermal stress) of the brake disc under the service condition meets the service requirement.

The mechanical property of the aluminum matrix composite material is lower than that of the traditional steel material, the forming difficulty is higher, a more advanced forming method and a reasonable structural design are needed to be adopted to improve the forming quality and the mechanical property of the aluminum matrix composite material brake disc, the brake temperature rise is reduced, and the brake thermal stress is reduced.

One of the objectives of the present invention is to provide a ventilation brake disc made of aluminum matrix composite for automobiles, which satisfies the size of the interface and realizes the lightweight of the brake disc by adopting the novel aluminum matrix composite and reasonable structural design; the second purpose of the utility model is to adopt the antigravity forming method and the reasonable forming process design to make the forming quality and the mechanical property of the brake disc more traditional gravity casting promoted by a wide margin, satisfy the requirement of the working condition of service simultaneously.

The utility model discloses contain two sets of technical scheme that have similar utility model thinking, first group's technical scheme is: the utility model provides an aluminium base composite material ventilation brake disc for car, this brake disc adopt SiCp/A356 aluminium base composite material to form through antigravity casting method shaping preparation, including first working disc, second working disc, splice bar, installation department and arc connecting portion, first working disc and second working disc pass through splice bar fixed connection, and the inboard braking surface of first working disc and the outside braking surface parallel arrangement of second working disc, the installation department passes through arc connecting portion and second working disc fixed connection.

Furthermore, the connecting ribs are of plate-shaped, columnar or plate-column combined structures, wherein the plate-shaped structures are linear or curved, and the thickness of the cross-sectional plate of the plate-shaped structures is not less than 6 mm; the columnar structure is in the shape of a cylinder, an elliptic cylinder, a polygon prism or a special-shaped structure, and the diameter of the minimum diameter or the diameter of an inscribed circle of the section of the columnar structure is not less than that of the column

Furthermore, wear limit marks are arranged on the outer circles of the first working disc and the second working disc close to the braking surface and used for marking the wear state and enhancing the heat dissipation capacity.

Further, cylindrical splice bar arranges along the tangential direction of brake disc friction working face internal diameter circle, as the strut type ventiduct structure of brake disc, and 20 tangential directions are all divided to whole brake disc altogether, and 4 splice bars are arranged to each tangential direction, and whole brake disc is 80 splice bars altogether.

Furthermore, the mounting part is a mounting structure of the brake disc, and is provided with a fixing hole for fixing the brake disc on an axle or a hub of an automobile.

The utility model discloses a second group's technical scheme is: the preparation method of the aluminum-based composite material ventilated brake disc for the automobile is characterized by comprising the following steps of:

s1: heating A356 aluminum alloy to 750 ℃ in a crucible, cooling to 650 ℃ along with the furnace after refining degassing, and preserving heat under the protection of nitrogen or argon or vacuum for later use;

s2: adding 18-28 wt% of SiC into the A356 aluminum alloy melt obtained in the step S1, and uniformly stirring;

s3: heating the mixture of the aluminum alloy and the SiC obtained in the step S2 to 680-750 ℃ for counter-gravity casting to obtain a casting blank of the brake disc;

s4: and (5) machining the casting blank obtained in the step (S3) to obtain the automobile aluminum-based composite material ventilated brake disc.

Optionally, in step S3, casting an ingot of the mixture of the aluminum alloy and SiC obtained in step S2, cooling the ingot, and using the cooled ingot as a raw material of the aluminum-based composite brake disc, wherein in the production of the brake disc, the ingot is heated to 680-750 ℃ under the protection of nitrogen or argon or vacuum, and then casting by counter-gravity to obtain a casting blank of the brake disc.

The utility model has the advantages that:

1. the utility model discloses an aluminium base combined material ventilation brake disc for car's ventilation heat-sinking capability, temperature homogenization ability, heat load ability, structural strength all have good performance, satisfy the performance requirement under the operating mode, and cast molding is of high quality, compare typical HT250 grey cast iron material ventilation brake disc of equivalent specification, realize losing weight more than 50%, compare other combined material brake discs, have obvious cost advantage;

2. the utility model discloses an aluminium base combined material ventilation brake disc of SiCp/A356 can regard as car lightweight brake disc to use widely, is expected to realize that the brake disc subtracts heavy 30% ~ 50% target, can also increase of service life, reduce the application cost, improve fail safe nature, realizes noiseless green braking, the specially adapted new energy automobile brake disc.

3. The utility model discloses a brake disc can reduce the friction temperature rise of brake disc because the higher heat-conduction ability of the aluminium base combined material of SiCp/A356 and heat accumulation ability to homogenization brake disc temperature distribution avoids forming big thermal stress in the brake disc, prevents that the crackle from sprouting and expanding.

4. The utility model discloses a brake disc adopts antigravity casting method shaping, and the casting mould can be for sclerosis sand mould or metal mold, and its bulk rigidity can be guaranteed to the whole casting of brake disc.

Drawings

Fig. 1 is a schematic structural view of a ventilated brake disc according to an embodiment of the present invention, wherein fig. 1(a) is an outer braking surface of the brake disc, and fig. 1(b) is an inner braking surface of the brake disc.

Fig. 2 is a schematic side view of a ventilated brake disc according to an embodiment of the present invention.

Fig. 3 is a longitudinal sectional view of fig. 2.

Fig. 4 is a half-sectional view of a ventilated brake disc according to an embodiment of the present invention.

Fig. 5 is a transverse cross-sectional view of a ventilation brake disc according to an embodiment of the present invention, wherein the connecting rib has a cylindrical structure.

Fig. 6 is a transverse cross-sectional view of another embodiment of the ventilated brake disc of the present invention, wherein the connecting ribs are curved plate-like structures with a curved curvature.

Fig. 7 is a transverse sectional view of a ventilation brake disc according to another embodiment of the present invention, wherein the connecting ribs are a combination of a linear plate and a cylinder.

Fig. 8 is an enlarged schematic view of a local structure of a solid brake disc wear limit mark according to an embodiment of the present invention.

Fig. 9 is an enlarged schematic view of a partial structure of a solid brake disc wear limit mark according to another embodiment of the present invention.

Fig. 10 is an enlarged view of a part of a solid brake disc wear limit mark according to another embodiment of the present invention.

Fig. 11 is an enlarged schematic view of a partial structure of a solid brake disc wear limit mark according to another embodiment of the present invention.

Fig. 12 is an enlarged view of a part of a solid brake disc wear limit mark according to another embodiment of the present invention.

Fig. 13 is a countergravity casting process according to an embodiment of the present invention.

FIG. 14 is the result of a filling simulation of the scheme shown in FIG. 13.

Fig. 15 is a result of a cooling curve simulation for the arrangement shown in fig. 13.

Wherein:

10-first working disc, 11-inner braking surface, 12-ventilating surface, 20-second working disc, 21-outer braking surface, 211-abrasion limit mark, 22-ventilating surface, 30-connecting rib, 40-mounting portion, 41-fixing hole and 50-arc connecting portion.

Detailed Description

The present invention is further described with reference to the accompanying drawings.

As shown in fig. 1-3, the utility model discloses an aluminium matrix composite material ventilation brake disc for car adopts the preparation of SiCp/A356 aluminium matrix composite to form, including first working disc 10, second working disc 20, splice bar 30, installation department 40 and arc connecting portion 50, first working disc 10 includes two faces, one is inboard braking face 11, another is ventilation face 12, second working disc 20 also includes two faces, one of them is outside braking face 21, another is ventilation face 22, first working disc 10 and second working disc 20 pass through splice bar 30 fixed connection, inboard braking face 11 of first working disc 10 and the outside braking face 21 parallel arrangement of second working disc 20, installation department 40 passes through arc connecting portion 50 and second working disc 20 fixed connection.

As shown in fig. 2 and 8, the outer circles of the first working disc 10 and the second working disc 20 near the braking surface are provided with wear limit marks 211 distributed along the entire circle of the outer circle of the working disc, and the width of the wear limit marks 211 is set according to the wear limit specified by the automobile manufacturer to mark the wear condition of the brake disc, so as to determine whether the brake disc needs to be replaced, increase the heat dissipation surface area of the brake disc, and improve the heat dissipation capacity.

Optionally, the wear limit indicator 211 can also be designed as shown in fig. 9, 10, 11, and 12.

As shown in fig. 4-7, the connecting rib 30 may be a plate-like, columnar or plate-column combined structure, wherein the plate-like structure is a straight line or a curved line (see fig. 6), and the cross-sectional plate thickness is not less than 6 mm; the columnar structure is in the shape of cylinder, elliptic cylinder, polygon prism or special-shaped structure (see fig. 4 and 5), and the diameter of the smallest cross section or the diameter of the inscribed circle is not less than

As shown in fig. 4 and 5, in a preferred embodiment, the cylindrical connecting ribs 30 are arranged along the tangential direction of the inner diameter circle of the friction working surface of the brake disc, as the strut-type ventilation duct structure of the brake disc, the whole brake disc is divided into 20 tangential directions, 4 connecting ribs 30 are arranged in each tangential direction, and the whole brake disc is divided into 80 connecting ribs 30. The brake disc friction surfaces here are the inner 11 and outer 21 braking surfaces.

As shown in fig. 1 and 4-7, the mounting portion 40 is a mounting structure of a brake disc, and is provided with a plurality of fixing holes 41, and the fixing holes 41 are used for fixing the brake disc on an axle or a hub of an automobile. The specific structure and dimensions of the mounting portion 40 are designed according to the requirements of the automobile manufacturer.

In one embodiment, the utility model provides a preparation method of aluminium base composite material ventilation brake disc for car, includes following step:

s1: heating A356 aluminum alloy in a crucible to 680-750 ℃, for example 680 ℃, 690 ℃, 700 ℃, 730 ℃ or 750 ℃, refining and degassing, cooling to 650 ℃ along with the furnace, and preserving heat under the protection of nitrogen or argon or vacuum for later use;

s2: adding 18-28 wt% of SiC into the A356 aluminum alloy melt obtained in the step S1, and uniformly stirring;

s3: and heating the mixture of the aluminum alloy and the SiC obtained in the step S2 to 680-750 ℃, for example 680 ℃, 690 ℃, 700 ℃, 730 ℃ or 750 ℃, and carrying out anti-gravity casting to obtain a casting blank of the brake disc.

S4: and (5) machining the casting blank obtained in the step (S3) to obtain the aluminum matrix composite solid brake disc for the automobile.

In an alternative embodiment, in step S3, the mixture of aluminum alloy and SiC obtained in step S2 is cast into an ingot, and the ingot is cooled and then used as a raw material of an aluminum matrix composite brake disc, and when the brake disc is produced, the ingot is heated to 680 and 750 ℃ under the protection of nitrogen or argon or vacuum, and is subjected to anti-gravity casting, so as to obtain a casting blank of the brake disc.

The utility model discloses in, the material of this ventilation brake disc adopts the aluminium base combined material of SiCp/A356 granule reinforcing, and the combined material base member adopts A356 or 356Z.2 aluminium ingot, and the reinforcing phase adopts the SiC granule, and the content is 18 ~ 28 wt%. Compare the brake disc of typical equal specification HT250 grey cast iron material on the market, the utility model discloses a SiCp/A356 aluminium base composite material ventilation brake disc can realize subtracting more than 50% of weight, and this aluminium base composite material has higher heat-conduction ability and heat accumulation ability, can reduce the friction temperature rise of brake disc to homogenization brake disc temperature distribution avoids forming big thermal stress in the brake disc.

The utility model discloses following embodiment is still provided.

The first embodiment is as follows:

the utility model discloses a brake disc adopts metal mold, antigravity casting method shaping brake disc blank, and the shaping quality and the mechanical properties of brake disc blank are showing and are being superior to with the shaping quality and the mechanical properties of material gravity casting. The tensile strength obtained by casting the metal mold and the counter-gravity of the brake disc can be improved by more than 60 percent compared with a gravity casting method, thereby ensuring the performance requirement of the aluminum matrix composite brake disc in service.

After the brake disc is cast, the brake disc is further processed by machining to reach the specified technical conditions.

The utility model discloses SiCp/A356 aluminium base composite's mechanical properties, thermophysical property, frictional wear performance can reach the friction braking performance requirement of car. The following is that the method that adopts simulation analysis and physical test is right the utility model discloses the SiCp/A356 aluminium base composite material ventilation brake disc carries out the result of analysis verification and test for the car.

1. Fluid simulation analysis

And carrying out simulation calculation by adopting fluid simulation software, and analyzing the characteristics of ventilation, heat accumulation and uniform temperature of the brake disc structure by taking the continuous braking working condition of 100-20 kph as a simulation working condition. The result of fluid analog simulation analysis shows, the utility model discloses aluminium base composite material ventilation brake disc's ventiduct structural design is showing the flow velocity difference that has reduced air flow velocity and different positions, and heat transfer coefficient and different position heat transfer coefficient difference are less, and this makes the utility model provides an aluminium base composite material brake disc has better ventilation heat-sinking capability, and the homogenization temperature effect is better, and is difficult for forming big thermal stress, can avoid hot cracked emergence, can effectively prevent crackle emergence and extension, the in service life-span of extension brake disc.

2. Heat capacity simulation analysis

And (3) carrying out heat capacity simulation calculation by adopting finite element software, setting a heat capacity simulation calculation working condition according to relevant requirements of an automobile brake disc test, and analyzing and checking the temperature and the structural strength of the SiCp/A356 aluminum-based composite material ventilated brake disc. The results of the simulation calculations are summarized in tables 1 and 2. Finite element thermal capacity simulation analysis result shows, under the settlement operating mode, the utility model discloses aluminium matrix composite ventilation brake disc has better heat dissipation, heat accumulation ability, and temperature distribution is comparatively even, and stress is less, and the structural design of brake disc can satisfy the temperature requirement and the intensity requirement of allowwing under the given operating mode.

TABLE 1. the embodiment of the utility model provides a weight and simulation condition highest temperature summary table of brake disc design

Table 2 the embodiment of the utility model provides a brake disc stress analog computation summary table

3. Simulation analysis of forming process

Adopt solidification simulation software to develop the utility model discloses aluminum matrix composite ventilates the metal mold of brake disc and the antigravity casting forming process simulation of resin psammitolite, analysis and aassessment pouring, solidification process and brake disc foundry goods quality. Fig. 13 is an optimized molding process, wherein point a1 is the position of the upper disc surface for casting, point a2 is the position of the lower disc surface for casting, point A3 is the position of the ingate, point a4 is the position of the runner, and point a5 is the position of the riser. The simulation analysis result of the utility model, which is developed by the Procast solidification simulation software, shows that the stable mold filling effect shown in figure 14 can be obtained by adopting the antigravity casting process shown in figure 13, and the risk of defects such as air holes, slag inclusion and the like generated in the mold filling process can be effectively reduced; FIG. 15 is a solidification cooling curve of points A1-A5, and according to the principle of sequential solidification, the reasonable solidification sequence should be A1-A2-A3-A4-A5, that is, point A1 is solidified first, and then point A2, point A3 and point A4 are solidified first, and finally point A5 is solidified. The cooling curve of fig. 15 shows, the utility model discloses a antigravity casting process can realize fine order solidification mode, solidifies in-process promptly from stalk A5 to cross gate A4, to ingate A3 cool time in proper order by long shortening, solidification order is reasonable, can establish good feeding passageway, can implement the solidification feeding to lower disk position A2, upper disk position A1, obtains the sound brake disc foundry goods blank of no shrinkage cavity.

Through the casting process of design, the utility model discloses aluminum matrix composite ventilation brake disc fills the type process steady, can establish good order solidification mode, can reduce the gas pocket effectively, press from both sides the sediment defect and can realize good feeding effect, can obtain the good SiCp/A356 aluminum matrix composite ventilation brake disc of shaping quality.

4. Mechanical properties

After a SiCp/A356 aluminum-based composite material sample formed by a metal mold and antigravity casting method is subjected to heat treatment, the mechanical properties such as strength, hardness and the like are tested, and the test results are shown in the following table. As can be seen from Table 3, the tensile strength of the aluminum matrix composite formed by the metal mold and antigravity casting method is improved by about 60% compared with the conventional gravity casting method.

Table 3 performance of the aluminum matrix composite material of the embodiment of the present invention

Molding method	Tensile strength at room temperature/MPa	hardness/HBS
			Gravity casting	About 170	About 80
Metal mould, antigravity	≥280	≥110

5. Physical and frictional wear properties

Test results show that the normal-temperature specific heat capacity of the aluminum matrix composite material is not less than 856J/(kg.K), and the normal-temperature thermal conductivity is not less than 143W/(m.K).

The friction test result of the aluminum-based composite material ventilated brake disc and the synthetic brake pad shows that the repeatability and the stability of the static friction coefficient are good in a dry state and a wet state, and the average static friction coefficient is 0.42-0.48. The average friction coefficient under dry friction conditions is higher than 0.35. The curve of the instantaneous friction coefficient is smooth, and the instantaneous friction coefficient has good repeatability and stability under the same braking condition.

Furthermore, the utility model discloses aluminum matrix composite ventilation brake disc's nominal weight is 4.46 kilograms, compares with the typical equal specification HT250 grey cast iron brake disc in existing market, the utility model discloses the weight reduction of brake disc is more than 50%, and the lightweight effect is showing.

Example two:

the second embodiment is a ventilation brake disc with curved plate-shaped connecting ribs.

As shown in fig. 6, the connecting rib 30 of the present embodiment has a curved plate-like structure with a curvature, one end of the connecting rib 30 of the plate-like structure extends inward to the mounting portion 40 and is connected to the mounting portion 40, and the other end extends outward to a position close to the maximum outer diameter of the brake disc. 30 lath-shaped structural connecting ribs 30 are uniformly distributed on the whole brake disc along the circumferential direction.

Simulation analysis shows that the connecting rib 30 of the embodiment has excellent air pumping capacity, air flow in the air duct is high, the heat dissipation and cooling effects are obvious, and the friction temperature rise can be effectively reduced.

The rest structural features of the two-way air brake disc of the embodiment are the same as those of the first embodiment, and are not described again.

Example three:

the third embodiment is a ventilation brake disc combining a linear plate-shaped connecting rib and a cylindrical connecting rib.

As shown in fig. 7, in the present embodiment, the connecting rib 30 is formed by a three-ring structure, the inner ring is a linear plate-shaped structure, one end of the plate-shaped structure connecting rib 30 extends inwards to the mounting portion 40 and is connected with the mounting portion 40, the other end extends outwards to a position close to the middle diameter of the brake disc body, and the 30 strip-shaped structure connecting ribs 30 are uniformly distributed on the whole brake disc along the circumferential direction; the middle ring is a cylindrical structure connecting rib 30, 30 connecting ribs are uniformly distributed on the same circumference of the brake disc, and the positions of the connecting ribs are staggered with the inner ring plate-shaped connecting ribs 30; the outer lane is cylindric structure splice bar 30, evenly distributed 30 on the same circumference of brake disc, and is crisscross each other with the cylindric splice bar 30 of well circle in the position.

Simulation analysis shows that the connecting rib 30 of the embodiment has the advantages of the first embodiment and the second embodiment in the ventilation and heat dissipation effects, and has the capabilities of better ventilation and heat dissipation and reducing the temperature of the brake disc, and better capability of homogenizing the temperature of each part of the brake disc.

The rest structural features of the three-ventilation brake disc in the embodiment are the same as those in the first embodiment, and are not described again.

Optionally, the utility model relates to an aluminium base composite brake disc for car, its casting mould can also adopt the sclerosis sand mould, like the resin sand mould.

The utility model discloses an aluminium base combined material ventilation brake disc's for car ventilation heat-sinking capability, temperature homogenization ability, heat load capacity, structural strength all have good performance, satisfy the performance requirement under the operating mode, and casting shaping excellent quality, compare typical equal specification HT250 grey cast iron material ventilation brake disc, realize subtracting to weigh more than 50%, compare other combined material brake discs, have obvious cost advantage, the utility model discloses a SiCp/A356 aluminium base combined material ventilation brake disc can regard as car lightweight brake disc to use widely, is expected to realize that the brake disc subtracts 30% ~ 50% target, can also increase of service life, reduces the application cost, improves fail safe nature, realizes noiseless green braking, specially adapted new energy automobile brake disc.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims (5)

1. The utility model provides an aluminium base combined material ventilation brake disc for car, its characterized in that, this brake disc adopts the aluminium base combined material preparation of SiCp/A356 to form, includes first working disc (10), second working disc (20), splice bar (30), installation department (40) and arc connecting portion (50), first working disc (10) and second working disc (20) are through splice bar (30) fixed connection, inboard braking surface (11) of first working disc (10) and outside braking surface (21) parallel arrangement of second working disc (20), installation department (40) are through arc connecting portion (50) and second working disc (20) fixed connection.

2. The aluminum matrix composite material ventilated brake disc for automobiles according to claim 1, wherein the connecting rib (30) is a plate-like, columnar or plate-column bonded structure, wherein the plate-like structure is a linear or curved shape, and the thickness of the cross-sectional plate thereof is not less than 6 mm; the columnar structure is in the shape of a cylinder, an elliptic cylinder, a polygon prism or a special-shaped structure, and the diameter of the minimum diameter or the diameter of an inscribed circle of the section of the columnar structure is not less than that of the column

。

3. The ventilated brake disc of aluminum matrix composite for automobile according to claim 1, wherein the first and second discs (10, 20) are provided with wear limit marks (211) on the outer circumferences near the braking surfaces for marking the wear state and enhancing the heat dissipation capability.

4. The aluminum matrix composite material ventilated brake disc for the automobile according to any one of claims 1 to 3, wherein the cylindrical connecting ribs (30) are arranged in a tangential direction of an inner diameter circle of a friction working surface of the brake disc, as a strut type air duct structure of the brake disc, the whole brake disc is divided into 20 tangential directions in total, 4 connecting ribs (30) are arranged in each tangential direction, and the whole brake disc is divided into 80 connecting ribs (30) in total.

5. A ventilated brake disc of aluminium matrix composite material for motor vehicles according to any one of claims 1 to 3, wherein the mounting portion (40) is a mounting structure of the brake disc, provided with fixing holes (41) for fixing the brake disc to the axle or hub of the motor vehicle.

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