Automobile electromagnetic brake shell

Abstract

The utility model particularly relates to an automobile electromagnetic brake shell which comprises a cylindrical body, the body is provided with a fixing key, a flange, a key groove, a bearing hole, an inner hole and a coil containing chamber, the coil containing chamber is communicated with a wire passing hole, and the end face, away from the flange, between the outer side wall of the body and the coil containing chamber is a friction face. A coil riveting fixing face is arranged between the coil containing chamber and the inner hole and located on one end face of the bearing hole, the coil riveting fixing face is immersed into the coil containing chamber, and the friction face and the coil riveting fixing face are not located on the same plane. The shell is reasonable in structure, capable of bearing high torque and high in tolerance, can serve as an electromagnetic iron core to generate electromagnetic force to brake a friction disc, can avoid the potential failure problem caused by overheating, and is resistant to corrosion, light in weight and capable of meeting the performance requirements of automobile parts.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive electromagnetic brake housings, and particularly refers to an automotive electromagnetic brake housing. Background Technique

[0002] With the continuous deepening of the electrification and intelligentization of automotive technologies, more and more automobiles have added the configuration of electric door opening. Compared with the traditional manual door opening method, its application scenarios require more intelligence and diversification. In many scenarios, the door needs to be locked at a certain angle in a timely manner. Therefore, a new type of brake has been developed to meet this requirement. As a key component for restricting door opening and closing, this brake is installed at the lower part of the 4 or specified car door glass windows near the door lock as required. The housing, as a braking connection part, is installed between the motor and the door lock.

[0003] As a key component in this brake, the housing needs to bear the torque from the door motor on the one hand, and on the other hand, it needs to be fixed to the door parts through its own key grooves and also bear a certain torque. On the other hand, the part itself, as an electromagnet core, needs to generate sufficient electromagnetic force to brake the friction disc, and at the same time, it cannot generate too much heat leading to potential failure. Since it is a door part, it may be corroded by external rain, moisture, etc., and needs to meet certain salt spray corrosion requirements; finally, as an automotive part, the part needs to be weight-reduced, so there is a need for lightweighting.

[0004] Therefore, it is necessary to develop an automotive electromagnetic brake housing that meets the above requirements. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned technical defects and provide an automotive electromagnetic brake housing.

[0006] An automotive electromagnetic brake housing includes a cylindrical body. One end of the outer side of the wall of the body is provided with a flange. Between the outer side of the wall of the body and the flange, there are several fixing keys. Inside the wall of the body near the flange end, several key grooves are evenly distributed. Near the key grooves inside the body, there is a bearing hole. Inside the body, on the side of the bearing hole far from the key grooves, there is an inner hole passing through the body. At the end of the body far from the flange and surrounding the inner hole, there is a coil accommodating chamber. On the wall of the body, there is a wire passing hole communicating with the coil accommodating chamber. The outer side wall of the body and the coil accommodating chamber and the end face far from the flange is a friction surface. Between the coil accommodating chamber and the inner hole and at one end face of the bearing hole is a coil riveting and fixing surface, and the coil riveting and fixing surface is recessed into the coil accommodating chamber. The friction surface and the coil riveting and fixing surface are not in the same plane.

[0007] Furthermore, between the bearing hole and the inner hole, there is a step for avoiding interference with the rotation of the bearing balls.

[0008] Furthermore, the coil accommodating chamber is provided with a crescent-shaped stepped sunk groove for avoiding interference with the coil.

[0009] Furthermore, the number of the fixing keys is 4. Two of the fixing keys are distributed at an angle of 50 degrees with respect to the axis of the body and are symmetric with the other two fixing keys.

[0010] Furthermore, the distance between the friction surface and the coil riveting and fixing surface does not exceed 0.3 mm.

[0011] Advantages of the present utility model: The housing structure of the present utility model is reasonable, capable of bearing high torque and having strong tolerance, capable of generating electromagnetic force as an electromagnet core to brake the friction disc, capable of avoiding potential failure problems caused by overheating. The housing of the present utility model is corrosion-resistant and lightweight, and can meet the performance requirements of automotive parts. Description of the Drawings

[0012] Figure 1 is a three-dimensional schematic view of a housing of an automotive electromagnetic brake of the present invention;

[0013] Figure 2 is a second three-dimensional schematic view of a housing of an automotive electromagnetic brake of the present invention;

[0014] Figure 3 is a side view schematic view of a housing of an automotive electromagnetic brake of the present invention;

[0015] Figure 4 is Figure 3 the schematic view of the A-A cross-section in

[0016] Figure 5 is a three-dimensional connection schematic view of a housing of an automotive electromagnetic brake of the present invention and some brake components;

[0017] Figure 6 is an assembled cross-section schematic view of a housing of an automotive electromagnetic brake of the present invention and some brake components.

[0018] As shown in the figure: 1. Body; 2. Fixing key; 3. Flange; 4. Keyway; 5. Bearing hole; 6. Inner hole; 7. Coil accommodating chamber; 8. Wire hole; 9. Friction surface; 10. Coil riveting and fixing surface; 11. Step; 12. Crescent sunk groove; 1-1. Door connection part; 1-2. Motor connection part; 1-3. Friction disc; 1-4. Bearing. Detailed Embodiments

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0020] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0021] In the description of the embodiments of the present utility model, if a certain feature is referred to as "arranged", "fixed", "connected", "installed" on another feature, it can be directly arranged, fixed, connected on another feature, or indirectly arranged, fixed, connected, installed on another feature.

[0022] In the description of the embodiments of the present utility model, if "several" is involved, its meaning is more than one; if "a plurality" is involved, its meaning is more than two; if "greater than", "less than", "exceeding" are involved, they should all be understood as not including the number itself; if "above", "below", "within" are involved, they should all be understood as including the number itself. If "first", "second" are involved, it should be understood as being used to distinguish technical features and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0023] The following further describes the present utility model in detail with reference to the drawings.

[0024] As Figures 1-4As shown in the figure, an automotive electromagnetic brake housing includes a cylindrical body 1. One end of the outer side of the wall of the body 1 is provided with a flange 3. Between the outer side of the wall of the body 1 and the flange 3, several fixing keys 2 are provided. Inside the wall of the body 1 near one end of the flange 3, several key grooves 4 are evenly distributed. Near the key grooves 4 inside the body 1, a bearing hole 5 is provided. Inside the body 1, on the side of the bearing hole 5 away from the key grooves 4, there is an inner hole 6 passing through the body 1. At one end of the body 1 away from the flange 3 and surrounding the inner hole 6, there is a coil accommodation chamber 7. On the wall of the body 1, there is a wire passing hole 8 communicating with the coil accommodation chamber 7. The outer side wall of the body 1 and the coil accommodation chamber 7 and away from one end face of the flange 3 is a friction surface 9. Between the coil accommodation chamber 7 and the inner hole 6 and at one end face of the bearing hole 5 is a coil riveting and fixing surface 10. The coil riveting and fixing surface 10 is recessed into the coil accommodation chamber 7. The friction surface 9 and the coil riveting and fixing surface 10 are not in the same plane and the distance between them does not exceed 0.3 mm.

[0025] The body 1, the fixing keys 2 and the flange 3 are of an integral structure and are made of high-strength, corrosion-resistant and high-temperature-resistant materials.

[0026] During implementation, the specific dimensions of each component are as follows:

[0027] The number of the fixing keys 2 is 4. Two of the fixing keys 2 are distributed at an angle of 50 degrees from the axis of the body 1 and are symmetrical with the other two fixing keys 2. The length of the fixing keys 2 is 5 - 20 mm and the width is 3 - 5 mm.

[0028] Preferably, the length of the fixing keys 2 is 9 mm and the width is 3.85 mm.

[0029] The length of the flange 3 along the axis direction of the body 1 is 1.5 - 4 mm;

[0030] Preferably, the length of the flange 3 along the axis direction of the body 1 is 1.9 mm.

[0031] The key grooves 4 are rectangular key grooves with a width of 3 - 6 mm, a length of 3 - 6 mm, and the number of key grooves is 6 - 10;

[0032] Preferably, the number of the key grooves 4 is 8, the width is 4.65 mm, and the length is 4.8 mm.

[0033] Between the bearing hole 5 and the inner hole 6, there is a step 11 for preventing interference with the rotation of the bearing balls. The diameter of the inner hole 6 is 9 - 12 mm for fixing the bearing. For example, if the bearing hole diameter is 19 mm, it is used to fix a bearing with an outer diameter of 19 mm and an inner diameter of 8 mm;

[0034] Preferably, the diameter of the inner hole 6 is 10.5 mm.

[0035] The coil accommodating chamber 7 is provided with a crescent-shaped stepped sink, i.e., the crescent sink 12 for avoiding interference with the coil. The length of the coil accommodating chamber 7 is generally 9 - 11 mm; preferably, the length of the coil accommodating chamber 7 is 10.06 mm.

[0036] Preferably, the wire passing hole 8 is a coil wire passing hole with a diameter of 5.5 mm.

[0037] Preferably, the distance between the friction surface 9 and the coil riveting fixing surface 10 is 0.075 mm.

[0038] When the automotive electromagnetic brake housing of the present utility model is in use, as Figure 5 and 6 shown, the rod body with the door connection component 1 - 1 and the motor connection component 1 - 2 is installed in the housing. A bearing 1 - 4 is arranged between the bearing hole 5 and the rod body. A friction disc 1 - 3 is installed on the rod body at the friction surface 9. There is an air gap between the friction disc 1 - 3 and the friction surface 9. The friction disc 1 - 3 is fixedly connected to the rod body. The fixing key 2 is used to fix with the fixing component of the door. The door connection component 1 - 1 is connected to the door, and the motor connection component 1 - 2 is connected to the motor. When the friction disc 1 - 3 is energized, the side of the friction disc 1 - 3 close to the friction surface 9 is attracted to the friction surface 9 to achieve braking.

[0039] The housing of the present utility model is made of the following materials by using powder metallurgy and machining techniques:

[0040] The materials include raw materials with the following mass percentages: P, 0 - 0.9%, the balance is Fe, and the remaining impurities are < 1%. Among them, P is added to the iron powder in the form of iron - phosphorus alloy. The Fe powder is easy - to - compress high - purity iron powder. This material is made by powder metallurgy process, and its properties include high strength, corrosion resistance and heat resistance.

[0041] Specifically, it includes the following steps:

[0042] Step 1: Material preparation. The materials include raw materials with the following mass percentages: P, 0 - 0.9%, the balance is Fe, and the remaining impurities are < 1%. Among them, P is added to the iron powder in the form of iron - phosphorus alloy. The Fe powder is easy - to - compress high - purity iron powder;

[0043] Step 2: Powder mixing: According to the component ratio in Step 1, powder mixing treatment is carried out to meet the requirements of powder metallurgy forming and pressing. During the powder mixing process, segregation, agglomeration, explosion, etc. should not occur among the powders;

[0044] Step 3: Forming: It is formed by using a mold and a mechanical forming press of more than 60 tons. The mold structure is two - up and three - down, and special positioning is adopted between the molds to ensure the position accuracy requirements of the product; meanwhile, the density of each part is strictly controlled during the forming process;

[0045] Step 4. Sintering: The product blank formed in Step 3 is placed on a refractory plate for sintering. The temperature in the high-temperature sintering stage is controlled at 1100°-1250° for sintering and forming.

[0046] Step 5. Primary machining: mainly rough machining, machining the product obtained by sintering in Step 4, including rough turning the bearing hole, drilling and deburring, such as bearing hole 5, wire passing hole 8, etc.

[0047] Step 6. Impregnation treatment: The shell blank is sealed with a special sealing agent. During the process, the sample block needs to be detected to ensure the impregnation effect. Before impregnation, pre-sealing treatment such as steam treatment can also be used.

[0048] Step 7. Shot peening treatment: The parts are suspended with specific tooling to remove the residual sealing agent on the surface. The shot peening particles are stainless steel shots with a diameter less than 0.3 mm.

[0049] Step 8: Electroplating treatment: Adopt the hanging plating method for galvanizing or nickel plating. Currently, galvanizing treatment is selected, and the color is blue-white.

[0050] Step 9. Secondary machining: including precision turning of holes such as bearing holes, precision turning of friction surfaces. The whole process is dry turning, and coolant is not allowed to be used, and the machining burrs are removed.

[0051] Step 10. Surface treatment: Use a surface treatment preparation to perform rust prevention treatment on the parts, and treat them with a special oxidant. The surface has a silver-white metallic luster and is oil-free.

[0052] The product obtained through the above steps, after testing, has a product density in the range of 6.8 g / cc - 7.5 g / cc, and its performance meets the usage requirements of the automotive electromagnetic brake housing.

[0053] Finally, the obtained product can be packaged. Package it according to production requirements to prevent bumps and scratches during transportation.

[0054] Adopting the powder metallurgy die forming process, each structure can be formed at one time, including the fixing key 2 fixed to the door component, the flange 3 of the door rubber ring edge, and the rectangular keyway 4 part connected to the motor drive. At the same time, taking advantage of the characteristics of powder metallurgy die forming, multiple punches can be set to completely form the coil accommodation chamber 7 and form the crescent-shaped sinking groove 12 for positioning the coil. Only a small amount of subsequent machining is required, such as precision machining of the bearing hole 5 and friction surface 9 with high precision requirements, and drilling the wire passing hole 8. The whole process of the product is compared with the processing of round steel blanks, including blanking, wire cutting, electrical discharge machining, etc., and the raw material utilization rate is increased to more than 80%. At the same time, the wire passing hole can be formed in the coil accommodation chamber part, and only the outer wall needs to be drilled through, avoiding excessive machining.

[0055] The above description is made on the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and without departing from the gist of the creation of the present utility model, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.

Claims

1. An automotive electromagnetic brake housing, characterized in that: It includes a cylindrical body (1). One end of the outer side of the wall of the body (1) is provided with a flange (3). A number of fixing keys (2) are provided between the outer side of the wall of the body (1) and the flange (3). A number of key grooves (4) are evenly distributed on the inner side of the wall of the body (1) near one end of the flange (3). A bearing hole (5) is provided inside the body (1) near the key groove (4). An inner hole (6) penetrating the body (1) is provided on the side of the bearing hole (5) away from the key groove (4) inside the body (1). A coil accommodating chamber (7) is provided at one end of the body (1) away from the flange (3) and surrounding the inner hole (6). A wire passing hole (8) communicating with the coil accommodating chamber (7) is provided on the wall of the body (1). The end face of the outer side wall of the body (1) away from the flange (3) between the outer side wall of the body (1) and the coil accommodating chamber (7) is a friction surface (9). The end face of one end of the bearing hole (5) between the coil accommodating chamber (7) and the inner hole (6) is a coil riveting and fixing surface (10). The coil riveting and fixing surface (10) is recessed into the coil accommodating chamber (7). The friction surface (9) and the coil riveting and fixing surface (10) are not in the same plane.

2. A motor vehicle electromagnetic brake housing according to claim 1, characterized in that: A step (11) for avoiding interference with the rotation of the bearing balls is provided between the bearing hole (5) and the inner hole (6).

3. The automotive electromagnetic brake housing according to claim 1, wherein: The coil accommodating chamber (7) is provided with a crescent-shaped stepped sink, a crescent sink (12) for avoiding interference with the coil.

4. The automotive electromagnetic brake housing according to claim 1, characterized in that: The number of the fixing keys (2) is 4. Two of the fixing keys (2) are distributed at an angle of 50 degrees with respect to the axis of the body (1) and are symmetric with the other two fixing keys (2).

5. A motor vehicle electromagnetic brake housing according to claim 1, characterized in that: The distance between the friction surface (9) and the coil riveting and fixing surface (10) does not exceed 0.3 mm.

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