An EMB caliper casting sand core structure

Abstract

The utility model relates to an EMB caliper casting sand core structure, including casting main body and sand core, the hook claw is equipped with in casting main body top, is equipped with the cylinder body in lower extreme, is equipped with the cylinder hole that goes through up and down in cylinder body, is equipped with a motor positioning boss at the two sides outer wall of cylinder body before and after, the sand core includes the core shaft that goes into the cylinder hole, the coaxial arrangement of core shaft and cylinder hole, and the bottom end is equipped with two locating blocks along the arrangement before and after to the core shaft downward and goes out the cylinder hole, the utility model discloses improves the casting quality: ensure the stability and reliability of sand core in the pouring process, reduce the sand eye, pore and so on defects of casting, improve the product pass rate.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, specifically to a sand core structure for EMB caliper castings. Background Technology

[0002] As the automotive industry undergoes a profound transformation towards the "new four modernizations" (electrification, intelligentization, connectivity, and sharing), lightweighting and intelligentization of vehicles have become core competitive advantages. As a key actuator for realizing intelligent chassis, brake-by-wire technology is undergoing a revolutionary iteration from electro-hydraulic braking (EHB) to electro-mechanical braking (EMB).

[0003] As a core mechanical component of the EMB system, the EMB caliper has a more complex structure than traditional calipers, placing higher demands on manufacturing processes. Currently, the core sand core structure in the casting production of EMB calipers presents the following prominent challenges: 1. High structural complexity: To meet the built-in requirements of the EMB motor and transmission mechanism, the caliper's internal cavity structure is complex, leading to high core-making difficulty and low yield. 2. High production costs: Complex sand cores often require multiple components, resulting in low core-making efficiency, high mold costs, and a high likelihood of scrap during production, directly increasing the unit cost. 3. Difficulty in guaranteeing accuracy and stability: Existing sand core solutions may face problems such as inaccurate positioning, insufficient strength, or improper gas generation control during the casting process, affecting the dimensional accuracy and internal quality of the casting, and consequently impacting the final performance and reliability of the EMB caliper. Summary of the Invention

[0004] The purpose of this utility model is to solve the problems existing in the prior art and provide an EMB caliper casting sand core structure.

[0005] The specific solution of this utility model is: an EMB caliper casting sand core structure, including a casting body and a sand core. The casting body has a claw at the top and a cylinder at the bottom. The cylinder has a cylinder hole that runs vertically through it. Each of the front and rear outer walls of the cylinder has a motor positioning boss. The sand core includes a mandrel that extends into the cylinder hole. The mandrel is coaxially arranged with the cylinder hole. The mandrel extends downward out of the cylinder hole and has two positioning blocks arranged in the front-rear direction at its bottom.

[0006] Furthermore, the two positioning blocks arranged in the front and rear directions are trapezoidal, and the two positioning blocks have different sizes.

[0007] Furthermore, a limiting boss is provided on the end face of the positioning block located on the back of the cylinder bore.

[0008] Furthermore, the upper end of the cylinder bore is provided with a countersunk platform of a certain height, and the upper end of the mandrel is provided with a boss that matches the countersunk platform.

[0009] Compared with the prior art, this utility model has the following advantages: 1. Simplified core-making process: Optimizes the sand core morphology, reduces the number of blocks, and reduces the complexity of the mold and the difficulty of core-making operation; 2. Improves casting quality: Ensures the stability and reliability of the sand core during the casting process, reduces defects such as sand holes and air holes in the casting, and improves the product qualification rate; 3. Significantly reduces costs: By improving production efficiency, reducing scrap rate, and reducing mold maintenance costs, the cost reduction goal of EMB calipers is fundamentally achieved, and the product's market competitiveness is enhanced. Attached Figure Description

[0010] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;

[0011] Figure 2 This is a three-dimensional structural diagram of the back of this utility model;

[0012] Figure 3 This is the front view of this utility model;

[0013] Figure 4 yes Figure 3 AA view;

[0014] Figure 5 yes Figure 4 BB view;

[0015] In the diagram: 1. Casting body; 2. Claw; 3. Cylinder bore; 4. Motor positioning boss; 5. Front positioning block; 6. Limiting boss; 7. Rear positioning block; 8. Mandrel. Detailed Implementation

[0016] See Figure 1-5This embodiment describes a sand core structure for an EMB caliper casting, comprising a casting body 1 and a sand core. The casting body 1 has a claw 2 at its top and a cylinder at its bottom, with a through-hole 3 inside the cylinder. A motor positioning boss 4 is located on each of the front and rear outer walls of the cylinder. The sand core includes a mandrel 8 extending into the cylinder hole 3, coaxially arranged with the cylinder hole 3. The mandrel 8 extends downwards from the cylinder hole 3 and has two positioning blocks arranged along the front-rear direction at its bottom. After casting, a positioning hole is machined on each of the two motor positioning bosses 4. Furthermore, a front positioning block 5 and a rear positioning block 7 are provided in the front-rear direction, both trapezoidal in shape and of different sizes. Further, a limiting boss 6 is provided on the end face of the positioning block located on the back of the cylinder hole 3. This invention, by setting two trapezoidal positioning blocks of different sizes and a limiting boss 6 at the end of one of the positioning blocks, prevents the mixing or misuse of sand cores corresponding to different caliper models. Furthermore, the upper end of the cylinder bore 3 is provided with a countersunk platform of a certain height, and the upper end of the mandrel 8 is provided with a boss that matches the countersunk platform. The sand core of this invention is positioned at the lowest point of the casting, preventing related sand holes from falling into the casting, resulting in high surface quality. The burrs on the casting sand core are in contact with the machined surface, requiring no grinding and being very clean; they can be removed later. Compared to the sand core with hook claw 2, the curing time is shortened by 50%, and the weight of the sand core is reduced by 60%.

Claims

1. A sand core structure for an EMB caliper casting, characterized in that: The casting includes a main body and a sand core. The main body has a hook at the top and a cylinder at the bottom. The cylinder has a through-hole. The outer walls of the front and rear sides of the cylinder each have a motor positioning boss. The sand core includes a mandrel that extends into the cylinder hole. The mandrel is coaxial with the cylinder hole. The mandrel extends downward into the cylinder hole and has two positioning blocks at its bottom that are arranged in the front-rear direction.

2. The sand core structure for an EMB caliper casting according to claim 1, characterized in that: The two positioning blocks arranged in the front-to-back direction are trapezoidal, and the two positioning blocks have different sizes.

3. The sand core structure for an EMB caliper casting according to claim 2, characterized in that: The end face of the positioning block located on the back of the cylinder bore is provided with a limiting boss.

4. The sand core structure for an EMB caliper casting according to claim 1, characterized in that: The upper end of the cylinder bore is provided with a countersunk platform of a certain height, and the upper end of the mandrel is provided with a boss that matches the countersunk platform.

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