Hinge

Abstract

The utility model relates to the technical field of machine manufacturing, in particular to a hinge. The hinge is an integrated hinge main body formed by a cold heading process through a die; the hinge main body comprises a base and a connecting body formed by upwards extending one end of the base, the connecting body is of a square cylinder structure, each cylinder surface of the connecting body is of a plane structure, a mounting hole is formed in the base, and a pin shaft hole penetrating through the left and right cylinder surfaces of the connecting body and a back hole formed in the back cylinder surface of the connecting body are formed in the top of the connecting body. The hinge provided by the utility model has a finer appearance and higher product quality.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, and in particular to a hinge. Background Technology

[0002] Car door hinges are key components for the smooth opening of car doors. With the increasing number of car manufacturers, competition in the automotive industry is becoming increasingly fierce. Therefore, each car company strives to ensure the highest quality for every component while minimizing costs within reasonable limits, in order to remain competitive in the vast automotive market.

[0003] Traditional car door hinges are mass-produced using rolled profiles, a method that suffers from long production cycles and low material utilization. Furthermore, products manufactured this way tend to have a rougher appearance and lower overall quality. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the current method of producing car door hinges using roll profiles, this utility model provides a hinge with a more refined appearance and higher product quality.

[0005] According to one aspect of the present invention, a hinge is provided.

[0006] The hinge body is formed into a single unit by cold forging using a mold;

[0007] The hinge body includes a base and a connecting body extending upward from one end of the base. The connecting body is a square column structure with each column surface being a planar structure. The base has mounting holes, and the top of the connecting body has pin holes penetrating its left and right columns, as well as a head hole on its rear column surface.

[0008] Optionally, the connector may have a stepped structure at one end, which is lower than the pin hole and the head hole. The front end of the stepped structure is chamfered to limit the rotation angle of the hinge.

[0009] Optionally, the inner wall of the posterior cerebral orifice is threaded with a pitch of 0.5-1.5 mm, which is used to connect with a limiting pin to limit the rotation angle of the hinge.

[0010] Optionally, the base is provided with drainage holes, the diameter of which is 2-5 mm and they are evenly distributed along the length of the base.

[0011] Optionally, the chamfer angle of the stepped structure is 30°-60°, and the step height is 1 / 3-1 / 2 of the diameter of the pin hole.

[0012] Optionally, the hinge body is made of alloy steel, and the alloy steel is composed of Cr12 type steel or 50Mn steel.

[0013] Optionally, the inner wall of the pin hole is provided with a wear-resistant coating, the coating thickness being 10-50 μm.

[0014] Optionally, the distance between the drain hole and the edge of the base is 3-8mm, and the hole spacing is 10-20mm.

[0015] Optionally, the surface roughness Ra of the hinge body is ≤0.8μm, and there are no burrs after cold heading.

[0016] Advantages of this invention: The hinge body is integrally formed from the base and the connecting body, and each cylindrical surface of the connecting body is a plane. In contrast, the outer surface of the hinge made of traditional rolled profiles is very rough. Compared with the traditional hinge, the hinge provided by this invention has a more refined appearance and higher product quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the appearance of a hinge according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the hinge body according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the hinge with mounting holes and pin holes according to an embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the appearance of a hinge with a back hole according to an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1:

[0024] like Figures 1-4 As shown, a hinge is formed into a single hinge body by cold forging through a mold. The hinge body includes a base 1 and a connecting body 2 extending upward from one end of the base 1. The connecting body 2 is a square column structure with each column surface being a planar structure. The base 1 has mounting holes 11. The top of the connecting body 2 has pin holes 21 penetrating through its left and right column surfaces, and a head hole 22 opened on its rear column surface.

[0025] Specifically, the hinge provided by this utility model is connected to the car door through the mounting hole 11 on the base, and there is also a body hinge that is connected to the car body. The door hinge and the body hinge are connected through the pin hole 21 and the connecting pin. The door hinge rotates around the connecting pin in the middle to realize the opening and closing of the car door.

[0026] Example 2:

[0027] like Figures 1-4 As shown, a hinge is formed into a single hinge body by cold forging through a mold. The hinge body includes a base 1 and a connecting body 2 extending upward from one end of the base 1. The connecting body 2 is a square column structure with each column surface being a planar structure. The base 1 has mounting holes 11. The top of the connecting body 2 has pin holes 21 penetrating through its left and right column surfaces, and a head hole 22 opened on its rear column surface.

[0028] Specifically, the hinge provided by this utility model is connected to the car door through the mounting hole 11 on the base, and there is also a body hinge that is connected to the car body. The door hinge and the body hinge are connected through the pin hole 21 and the connecting pin. The door hinge rotates around the connecting pin in the middle to realize the opening and closing of the car door.

[0029] Furthermore, a stepped structure 23 is provided at one end of the connecting body 2. The stepped structure 23 is lower than the pin hole 21 and the head hole 22. The front end of the stepped structure 23 is chamfered to limit the rotation angle of the hinge.

[0030] Specifically, without any limiting structure, a hinge can rotate 360°, but for a car door, the rotation angle is limited. The rotation angle cannot be too large, otherwise the car door is prone to collision. The rotation angle of a car door hinge is generally between 70° and 110°.

[0031] Furthermore, the inner wall of the posterior hole is threaded with a thread pitch of 0.5-1.5mm, which is used to connect with the limit pin to limit the rotation angle of the hinge. On the one hand, it limits the rotation angle of the door during the opening and closing of the door, and on the other hand, it enhances the stability of the connection between the door and the body.

[0032] Furthermore, the base is also provided with drainage holes, the diameter of which is 2-5mm and they are evenly distributed along the length of the base, for drainage between the gaps in the car door.

[0033] Furthermore, the chamfer angle of the stepped structure is 30°-60°, and the step height is 1 / 3-1 / 2 of the diameter of the pin hole. The chamfer angle of 30°-60° ensures that the contact area between the step and the body hinge protrusion is moderate when the door rotates, which avoids excessive friction and effectively limits the door opening angle (70°-110°) to prevent collisions; the step height is proportional to the diameter of the pin hole (1 / 3-1 / 2), which ensures the reliability of the limiting function and avoids local stress concentration in the connecting body due to excessive step height, thus improving the overall structural stability.

[0034] Furthermore, the hinge body is made of alloy steel, specifically Cr12 steel or 50Mn steel. Cr12 steel (high carbon, high chromium) and 50Mn steel (medium carbon, manganese steel) possess excellent hardness and fatigue resistance, making them suitable for withstanding the impact loads of frequent opening and closing of vehicle doors.

[0035] Furthermore, the inner wall of the pin hole is provided with a wear-resistant coating, the coating thickness being 10-50 μm. The wear-resistant coating (such as DLC, titanium nitride) can reduce the coefficient of friction between the pin and the hole wall, reducing wear, especially in frequent rotation scenarios, increasing lifespan by more than 30%.

[0036] Furthermore, the distance between the drain hole and the edge of the base is 3-8mm, and the hole spacing is 10-20mm. The 3-8mm distance prevents the drain hole from being too close to the edge, which would reduce the structural strength, while ensuring that accumulated water is drained quickly and preventing corrosion.

[0037] Furthermore, the surface roughness Ra of the hinge body is ≤0.8μm, and there are no burrs after cold heading. The smooth surface with Ra≤0.8μm does not require secondary polishing, directly meeting the requirements of high-end models for appearance refinement.

[0038] The hinge provided by this utility model is manufactured in the following manner:

[0039] The hinge body is formed from a metal blank using a mold through a cold heading process.

[0040] Install mounting holes on the base of the hinge body, and open the shaft hole and the head hole on the connecting body of the hinge body.

[0041] Machining the limiting surface of the hinge body;

[0042] The posterior cerebellar foramen was tapped.

[0043] In the cold heading process, a high-plasticity, low-hardness metal blank is formed into an integral hinge body by a cold heading machine at room temperature. The use of a cold heading machine to form the hinge body in one step can effectively reduce material waste, and the surface of the formed hinge body is highly smooth, reducing the need for subsequent surface polishing.

[0044] Specifically, the steps of the cold heading process are as follows: First, select the metal material for cold heading, such as alloy steel, stainless steel or carbon structural steel, to ensure that the material has good plasticity and strength; perform annealing softening, phosphating saponification or coating treatment on the material to reduce hardness, improve lubricity and reduce mold wear; the cold heading machine applies pressure to the metal material in the mold, causing the metal material to undergo plastic deformation in the mold, thereby forming the shape of the hinge body.

[0045] The metal blanks are made of alloy steel, stainless steel, aluminum alloy or carbon structural steel.

[0046] Specifically, alloy steel includes Cr12 steel, 50Mn, etc. The advantages of using alloy steel are: high strength, high toughness, good corrosion resistance, suitable for the plastic deformation requirements of cold heading process. 50Mn can improve hardness and wear resistance after heat treatment, meeting the load-bearing requirements of car door hinges. The use of alloy steel is common in German cars and meets the strict requirements of national standards for longitudinal (≥11.11KN) and lateral (≥8.89KN) loads.

[0047] Stainless steel includes 304, 316, etc. The advantages of choosing stainless steel are: excellent corrosion resistance and aesthetics, no need for frequent maintenance, and suitability for humid or corrosive environments; it is often used in car models with high requirements for appearance and durability, such as door hinges of luxury brands.

[0048] The advantages of aluminum alloys are: they are relatively light, which can reduce the weight of the vehicle body and improve fuel efficiency; they are often used in some luxury models, such as the Mercedes-Benz E-Class, to balance lightweight and strength.

[0049] Carbon structural steel includes Q195, Q235, etc. The advantages of using carbon structural steel are: low cost, good cold heading performance, and it is often used in economy car models.

[0050] The preferred material is alloy steel.

[0051] The limiting surface of the hinge body is machined by milling to limit the maximum opening angle of the hinge, and the machining is performed using a milling machine.

[0052] Among them, the back hole is tapped and connected to the limit pin to limit the hinge rotation angle. The back hole and the limit pin are connected by threads. When the car door is opened, the limit pin is used to prevent the car door from opening too wide and causing the car door to collide.

[0053] In this process, mounting holes are drilled on the base of the hinge body, and both the mounting holes and the pin holes are formed using a drilling machine.

[0054] Hinges produced by applying cold heading technology to hinge manufacturing have advantages over hinges produced by traditional roll forming, such as improved material utilization, reduced production cycle, simplified processes, and improved product quality.

[0055] The specific process for producing hinges using traditional roll profiles is as follows: the roll profile is cut into sections, additionally ground, the two end faces of the hinge are milled, and finally mounting holes, pin holes, and back holes are drilled. Furthermore, the hinges produced by traditional roll profiles have very rough and uneven front faces.

[0056] The hinge body provided by this utility model has a high surface smoothness, which does not require additional polishing, thus improving both product quality and material utilization.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A hinge, characterized in that, The hinge body is formed into a single unit by cold forging using a mold; The hinge body includes a base and a connecting body extending upward from one end of the base. The connecting body is a square column structure with each column surface being a planar structure. The base has mounting holes, and the top of the connecting body has pin holes penetrating its left and right columns, as well as a head hole on its rear column surface.

2. The hinge according to claim 1, characterized in that, The connector has a stepped structure at one end on the left or right. The stepped structure is lower than the pin hole and the head hole. The front end of the stepped structure is chamfered to limit the rotation angle of the hinge.

3. The hinge according to claim 1, characterized in that, The inner wall of the posterior cerebral orifice is threaded with a pitch of 0.5-1.5 mm, which is used to connect with a limiting pin to limit the rotation angle of the hinge.

4. The hinge according to claim 1, characterized in that, The base has drainage holes with a diameter of 2-5 mm, which are evenly distributed along the length of the base.

5. The hinge according to claim 2, characterized in that, The chamfer angle of the stepped structure is 30°-60°, and the step height is 1 / 3-1 / 2 of the diameter of the pin hole.

6. The hinge according to claim 1, characterized in that, The hinge body is made of alloy steel, and the alloy steel is composed of Cr12 type steel or 50Mn steel.

7. The hinge according to claim 1, characterized in that, The inner wall of the pin hole is provided with a wear-resistant coating, the coating thickness being 10-50μm.

8. The hinge according to claim 4, characterized in that, The distance between the drainage hole and the edge of the base is 3-8mm, and the hole spacing is 10-20mm.

9. The hinge according to claim 1, characterized in that, The surface roughness Ra of the hinge body is ≤0.8μm, and there are no burrs after cold heading.

Images