A car door hinge with a buffer function

Abstract

This application discloses a door hinge device with a buffer function, aiming to solve the problems of existing door hinges being easily impacted, severely worn, and having a short structural lifespan during frequent and rapid opening and closing. The device includes a mounting base, a hinge arm, a hinge pin, and a hydraulic cylinder. The two ends of the hydraulic cylinder are eccentrically arranged relative to a first rotation axis defined by the hinge pin, allowing for passive extension and retraction during door opening or closing to provide buffering damping. A rolling bearing is installed between the hinge pin and the hinge arm to reduce friction and extend service life. Anti-wear pads are installed between the hinge arm and the mounting base to reduce direct contact wear. The cylinder body of the hydraulic cylinder is fixedly connected to the hinge arm, and the push rod is connected to a lug plate on the mounting base via a rotating joint, thereby improving the overall structure's buffering energy absorption capacity, stability, and durability. This technical solution can significantly reduce impact loads, improve the smoothness of door opening and closing, and enhance overall vehicle safety performance.

Description

Technical Field

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

[0002] In daily life, the frequent opening and closing of car doors is a common operation. However, during this process, especially at the moment the door closes, a significant impact load is often generated. This instantaneous peak impact force often acts concentrated on the door hinge, causing localized stress concentration in that area.

[0003] To improve the structural strength and durability of car door hinges, traditional solutions often involve increasing the thickness of the hinge arms or using higher-strength materials. However, these methods tend to significantly increase manufacturing costs and overall weight, which contradicts the requirements of lightweighting and cost control in modern automotive design. Furthermore, traditional door hinges often produce a loud closing noise when the door is closed due to the lack of an effective cushioning mechanism, which not only affects the user experience but also reduces the overall comfort of the vehicle. Summary of the Invention

[0004] This utility model discloses a car door hinge, which aims to solve the problems of impact load, stress concentration, wear and noise generated by existing car door hinges during the opening and closing of car doors.

[0005] The technical solution of this utility model is as follows:

[0006] A car door hinge includes: a mounting base; a hinge arm rotatably connected to the mounting base via a hinge pin, the hinge pin defining a first rotation axis; and a hydraulic cylinder connected between the hinge arm and the mounting base; wherein the connection point between the hydraulic cylinder and the hinge arm, and the connection point between the hydraulic cylinder and the mounting base, are both eccentrically arranged relative to the first rotation axis.

[0007] This technical solution effectively absorbs the impact load when the door closes through the buffering effect of the hydraulic cylinder, reduces stress concentration at the root of the hinge arm, thereby extending the service life of the hinge and reducing noise.

[0008] Furthermore, the aforementioned door hinge also includes two rolling bearings, which are spaced apart between the hinge arm and the hinge pin along the direction of the first rotation axis.

[0009] This technical solution can significantly reduce the frictional resistance between the hinge arm and the hinge pin, making the door opening and closing smoother and further improving the durability of the hinge.

[0010] Furthermore, the aforementioned door hinge also includes an anti-wear pad, which is disposed between the hinge arm and the mounting base.

[0011] This technical solution can effectively reduce wear between the hinge arm and the mounting base, further extending the service life of the hinge.

[0012] More specifically, in some embodiments, according to the aforementioned door hinge, the hydraulic cylinder includes a cylinder body and a push rod; the cylinder body is connected to the hinge arm, and the push rod is connected to the mounting base.

[0013] This technical solution clarifies the structural composition of the hydraulic cylinder and its connection method with each part of the hinge, ensuring the realization of the hydraulic buffer function.

[0014] Preferably, according to the aforementioned door hinge, a lug is provided on the mounting base; the push rod is rotatably connected to the lug via a rotating joint.

[0015] This technical solution provides a stable and flexible rotating connection point for the push rod, ensuring smooth movement of the hydraulic cylinder during the opening and closing of the car door.

[0016] Furthermore, according to the aforementioned door hinge, the rotating joint includes a pivot; the push rod is rotatably connected to the pivot.

[0017] This technical solution allows for further refinement of the rotating pair structure, ensuring the stability and reliability of the connection.

[0018] More specifically, in some embodiments, according to the aforementioned door hinge, the hinge pin is located on one side of the hinge arm, and the hydraulic cylinder is located on the other side of the hinge arm away from the hinge pin.

[0019] This technical solution can optimize the layout of the hydraulic cylinder, enabling it to achieve the best buffering effect within a limited space and potentially provide a better lever arm action.

[0020] Preferably, according to the aforementioned door hinge, the cylinder body of the hydraulic cylinder is fixedly connected to the hinge arm.

[0021] This technical solution ensures a secure connection between the hydraulic cylinder bodies and improves the stability of the entire buffer system.

[0022] Furthermore, according to the aforementioned door hinge, the hydraulic cylinder also includes a connecting column and a piston.

[0023] This technical solution can further improve the description of the internal structure of the hydraulic cylinder and provide the necessary components to realize its hydraulic buffer function.

[0024] Preferably, according to the aforementioned door hinge, the rotating joint is a columnar structure or a plate-like structure.

[0025] This technical solution provides a variety of options for the design of rotary joints to adapt to different structural and spatial requirements, thereby improving design flexibility.

[0026] The present invention discloses a car door hinge, which effectively solves the problems of impact load, stress concentration and noise generated when the car door is frequently opened and closed in the prior art by setting a hydraulic cylinder between the mounting base and the hinge arm, and the connection point of the hydraulic cylinder, the hinge arm and the mounting base are all eccentrically set relative to the first rotation axis defined by the hinge pin. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a high-strength car door hinge arm.

[0028] Figure 2 This is a side view schematic diagram of a high-strength car door hinge arm structure.

[0029] Figure 3 This is a cross-sectional schematic diagram of a hydraulic device for a high-strength car door hinge arm.

[0030] Figure 4 This is a cross-sectional schematic diagram of the connection between the hinge arm and the hinge pin in a high-strength car door hinge arm.

[0031] Attached icon numbers: 1. Mounting base; 11. Hinge pin; 2. Hinge arm; 21. Hydraulic cylinder; 211. Connecting column; 212. Piston; 213. Push rod; 23. Rolling bearing; 24. Anti-wear pad; 3. Rotating pair; 31. Rotating shaft; 32. Support plate. Detailed Implementation

[0032] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.

[0033] During the opening and closing of existing car doors, frequent and rapid opening and closing operations by users can easily generate significant impact loads. Especially at the moment of closing the door, the instantaneous peak impact force often concentrates on the root area of ​​the hinge arm, forming a local stress concentration.

[0034] This embodiment discloses a car door hinge, which is typically used between the car door and the vehicle body to enable the opening and closing of the door. The core of this door hinge lies in its ability to effectively manage the impact force generated during rapid opening and closing of the door, and to improve the overall structural strength. The mounting base 1 is typically fixedly connected to the vehicle body structure, while the hinge arm 2 is fixedly connected to the door. The hinge pin 11 is a key component connecting the mounting base 1 and the hinge arm 2, allowing the hinge arm 2 to rotate around a first rotation axis defined by it, thereby realizing the opening and closing of the door. The hydraulic cylinder 21, as the main buffer element, typically contains hydraulic oil and a piston, providing a buffering effect through the flow resistance of the hydraulic oil. The connection points between the hydraulic cylinder 21 and the hinge arm 2 and the mounting base 1 refer to the connection positions of the two ends of the hydraulic cylinder 21 with the respective hinge arm 2 and mounting base 1. These connection points are designed to be eccentrically positioned relative to the rotation center of the hinge arm 2, i.e., the first rotation axis. This means that they are not located on the first rotation axis, but are at a certain radial distance from it. This eccentric design is the key to achieving the buffering effect.

[0035] See Figure 1 This embodiment discloses a car door hinge, which includes a mounting base 1, a hinge arm 2, and a hydraulic cylinder 21.

[0036] Mounting base 1 is designed to be securely fixed to the vehicle body structure. As a preferred embodiment, mounting base 1 can be made of high-strength steel or cast aluminum alloy to ensure its structural stability when bearing the weight of the door and impact loads. Mounting base 1 may have pre-drilled bolt holes for reliable installation onto the vehicle body using bolts.

[0037] The hinge arm 2 is designed to be securely attached to the door. The hinge arm 2 can be made of either high-strength steel or lightweight aluminum alloy to balance strength and weight requirements. One end of the hinge arm 2 is rotatably connected to the mounting base 1 via a hinge pin 11.

[0038] The hinge pin 11 is the core component connecting the mounting base 1 and the hinge arm 2, allowing the hinge arm 2 to rotate relative to the mounting base 1. The hinge pin 11 can be a solid or hollow cylindrical pin, with both ends fixed in corresponding holes in the mounting base 1, and the other end secured by a nut or other fastener. The central axis of the hinge pin 11 defines a first axis of rotation, around which the hinge arm 2 rotates, thereby opening and closing the door.

[0039] Hydraulic cylinder 21 is cleverly connected between hinge arm 2 and mounting base 1. Hydraulic cylinder 21 can be a single-acting or double-acting hydraulic damper, filled with hydraulic medium, and generates damping force through the movement of piston within the cylinder. The two ends of hydraulic cylinder 21 are connected to hinge arm 2 and mounting base 1, respectively.

[0040] The connection points between the hydraulic cylinder 21 and the hinge arm 2, as well as the connection point between the hydraulic cylinder 21 and the mounting base 1, are both eccentrically positioned relative to the first rotation axis. This means that neither of the two connection points of the hydraulic cylinder 21 is directly located on the first rotation axis, but rather maintains a certain radial distance from it. For example, when the hinge arm 2 rotates around the first rotation axis, the length of the hydraulic cylinder 21 changes accordingly due to the eccentricity of its connection points, thus passively extending and retracting. This eccentric arrangement allows the hydraulic cylinder 21 to be effectively driven during the opening or closing of the door, generating axial buffering force.

[0041] The door hinge in this embodiment cleverly solves the aforementioned problem by introducing a hydraulic cylinder 21 and setting its connection point eccentrically relative to the first rotation axis. The hydraulic cylinder 21 provides active buffering during door opening and closing, effectively absorbing and dispersing impact energy, thereby significantly reducing the concentration of impact load at the hinge arm root and preventing premature fatigue or damage to the hinge.

[0042] When the door opens, the hinge arm 2 rotates in the opposite direction, driving the hydraulic cylinder 21 to be stretched. During the stretching process, the hydraulic cylinder 21 also provides controllable resistance, making the door opening process smoother and preventing the door from suddenly popping open or shaking.

[0043] In some embodiments described above, the hinge arm 2 is rotatably connected to the mounting base 1 via a hinge pin 11. However, during long-term use, the direct contact between the hinge arm 2 and the hinge pin 11 may lead to increased friction and accelerated wear, thereby affecting the smoothness of rotation and service life. To address this, this application further proposes a scheme of providing a rolling bearing 23 between the hinge arm 2 and the hinge pin 11 to optimize their rotatable connection.

[0044] The rolling bearing 23 is a mechanical component that reduces rotational friction and improves rotational efficiency, typically consisting of an inner ring, an outer ring, rolling elements, and a cage. Specifically, two rolling bearings 23 are configured to be spaced apart along the first rotational axis, meaning they maintain a certain distance in the axial direction of the hinge pin 11 and are located within the connection area between the hinge arm 2 and the hinge pin 11. This spacing helps provide more stable support and distributes axial and radial loads.

[0045] The solution of this application converts sliding friction into rolling friction by introducing two rolling bearings 23 between the hinge arm 2 and the hinge pin 11. Because the rolling elements of the rolling bearings 23 roll between the inner and outer rings, the coefficient of friction of the rotating pair is greatly reduced, making the rotation of the hinge arm 2 relative to the hinge pin 11 smoother and less strenuous. At the same time, the rolling bearings 23 can effectively bear radial and axial loads and transmit them evenly, avoiding localized stress concentration, thereby significantly reducing wear on the contact surface between the hinge pin 11 and the hinge arm 2.

[0046] Through the above technical solution, the rotational resistance of the door hinge is significantly reduced due to the introduction of the rolling bearing 23, making the opening and closing process of the door easier and smoother. In addition, the rolling bearing 23 effectively reduces the direct wear between the hinge pin 11 and the hinge arm 2, thereby extending the service life of the door hinge and reducing maintenance requirements.

[0047] In some preferred embodiments, the inner bore of the hinge arm 2 can be machined to fit the outer ring of the rolling bearing 23, while the outer diameter of the hinge pin 11 fits the inner ring of the rolling bearing 23. The two rolling bearings 23 can be installed at opposite ends of the inner bore of the hinge arm 2 and axially positioned using shoulders or retaining rings to ensure they are spaced apart along the first axis of rotation. For example, deep groove ball bearings or tapered roller bearings can be used as the rolling bearings 23 to accommodate different loads and installation requirements.

[0048] In some embodiments described above, there is relative rotation between the hinge arm 2 and the mounting base 1 of the door hinge. However, during long-term use, wear may occur between the hinge arm 2 and the mounting base 1 due to direct contact, thereby affecting the smoothness of hinge rotation and its service life. To address this, this application further proposes an improvement scheme aimed at effectively reducing wear between components and improving the durability of the hinge.

[0049] Specifically, the door hinge of this application also includes an anti-wear pad 24, which is disposed between the hinge arm 2 and the mounting base 1. The anti-wear pad 24 is a thin sheet-like structure with wear-resistant properties, which can be made of polymer materials, composite materials, or metal materials with a low coefficient of friction. This ensures that when the hinge arm 2 rotates relative to the mounting base 1, the two main structural components are no longer in direct contact, but rather contact is achieved through the anti-wear pad 24 as an intermediate medium.

[0050] Based on the above-described embodiments of this application, in order to further optimize the structure of the door hinge, this application proposes an improved solution, namely, the hydraulic cylinder 21 includes a cylinder body and a push rod 213; the cylinder body is connected to the hinge arm 2, and the push rod 213 is connected to the mounting base 1.

[0051] The hydraulic cylinder 21 is a key component providing damping and assist functions. Its cylinder body is connected to the hinge arm 2, and the push rod 213 is connected to the mounting base 1. Specifically, the cylinder body can be fixed to the hinge arm 2 by welding, bolting, or other methods to ensure its stability and reliability during movement. The push rod 213 is connected to the mounting base 1 through a rotating joint, thereby realizing the extension and retraction movement of the push rod 213.

[0052] The solution in this application connects the cylinder body of the hydraulic cylinder 21 to the hinge arm 2 and the push rod 213 to the mounting base 1, allowing the hydraulic cylinder 21 to better adapt to the rotation of the hinge arm 2, thereby providing a smoother damping effect. When the car door opens or closes, the hinge arm 2 rotates around the first rotation axis, at which time the push rod 213 of the hydraulic cylinder 21 extends or retracts accordingly, thus buffering the movement of the car door. Since the cylinder body is directly fixed to the hinge arm 2, energy loss during movement can be reduced, improving the damping effect.

[0053] The above technical solution makes the installation of hydraulic cylinder 21 more stable, reduces vibration and noise, and improves the overall performance and service life of the door hinge. At the same time, because the damping effect of hydraulic cylinder 21 is more stable, it can effectively avoid sudden impacts during the opening or closing of the door, improving passenger comfort and safety.

[0054] In one specific implementation, the cylinder body of the hydraulic cylinder 21 can be fixed to the hinge arm 2 with bolts, and the number and position of the bolts can be adjusted according to actual needs. The push rod 213 can be connected to the mounting base 1 via a ball joint, thereby enabling the push rod 213 to rotate freely within a certain angle range. In addition, to improve the sealing performance of the hydraulic cylinder 21, a sealing ring can be provided between the cylinder body and the push rod 213.

[0055] The lug plate 32 is a plate-like structure extending from the mounting base 1. Its main function is to provide a connection point for the push rod 213, allowing the push rod 213 to be rotatably connected to the mounting base 1 via the revolute joint 3. The design of the lug plate 32 can be adjusted according to actual needs, such as changing its shape, size, and position to meet different design requirements. The revolute joint 3 is a mechanism that enables a rotatable connection between two components, and it can take various forms, such as pin connection, bearing connection, etc. In this embodiment, the main function of the revolute joint 3 is to allow the push rod 213 to rotate relative to the lug plate 32, thereby enabling the hydraulic cylinder 21 to better adapt to the rotation of the hinge arm 2.

[0056] In this application, by providing a lug plate 32 on the mounting base 1 and rotatably connecting the push rod 213 to the lug plate 32 via a rotating joint 3, the force exerted by the hydraulic cylinder 21 on the mounting base 1 can be effectively dispersed, avoiding stress concentration and thus improving the strength and durability of the mounting base 1. Furthermore, the rotating joint 3 allows the push rod 213 to better adapt to the rotation of the hinge arm 2, reducing friction and wear between the push rod 213 and the mounting base 1, thereby extending the service life of the hydraulic cylinder 21.

[0057] As a preferred embodiment, the rotating joint 3 can adopt a ball joint structure. Ball joint structures have advantages such as simple structure, high load-bearing capacity, and flexible rotation, which can well meet the design requirements of this application. The solution of this application uses a rotating shaft 31 to achieve the rotational connection between the push rod 213 and the support plate 32, which can effectively reduce friction and improve transmission efficiency, thereby ensuring that the hydraulic cylinder 21 can push or pull the hinge arm 2 more smoothly. At the same time, because the rotating shaft 31 has high strength and rigidity, it can effectively bear the load generated by the hydraulic cylinder 21, thereby ensuring the stability and reliability of the door hinge.

[0058] In the above embodiments of this application, the hinge pin 11 and the hydraulic cylinder 21 are both located on the same side of the hinge arm 2. In practical applications, due to the limitation of installation space, the arrangement of the hydraulic cylinder 21 may be interfered, or the structure of the hinge arm 2 may become more complicated.

[0059] To address this issue, this application proposes an improved solution: the hinge pin 11 is positioned on one side of the hinge arm 2, and the hydraulic cylinder 21 is positioned on the other side of the hinge arm 2 away from the hinge pin 11. In this manner, the hinge pin 11 and the hydraulic cylinder 21 are located on opposite sides of the hinge arm 2, effectively avoiding mutual interference and optimizing the structural layout.

[0060] The hinge pin 11 defines the first rotation axis, around which the hinge arm 2 rotates to open and close the door. The hydraulic cylinder 21 provides damping to control the speed at which the door opens or closes, preventing it from opening or closing too quickly.

[0061] Specifically, placing the hinge pin 11 on one side of the hinge arm 2 makes the structure of the hinge arm 2 more compact and reduces the amount of material used. At the same time, placing the hydraulic cylinder 21 on the other side of the hinge arm 2 away from the hinge pin 11 increases the lever arm of the hydraulic cylinder 21, thereby reducing the thrust required by the hydraulic cylinder 21 and reducing the size and weight of the hydraulic cylinder 21.

[0062] The solution of this application avoids mutual interference between the hinge pin 11 and the hydraulic cylinder 21 by setting the hinge pin 11 and the hydraulic cylinder 21 on both sides of the hinge arm 2 respectively, which makes the structure of the hinge arm 2 simpler and also reduces the size and weight of the hydraulic cylinder 21.

[0063] Furthermore, this structural design simplifies the overall structure of the door hinge. Compared to other connection methods, the fixed connection reduces additional connecting parts and assembly steps, lowering production costs and maintenance difficulty. Simultaneously, since there is no relative movement between the cylinder body of the hydraulic cylinder 21 and the hinge arm 2, wear and noise caused by friction or collision can be avoided, improving the lifespan and comfort of the door hinge.

[0064] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An automobile door hinge having a buffering function, characterized by comprising: include: Mounting base (1); hinge The hinge arm (2) is rotatably connected to the mounting base (1) via a hinge pin (11), the hinge pin (11) defining a first rotation axis; and a hydraulic cylinder (21) is connected between the hinge arm (2) and the mounting base (1); wherein the connection point between the hydraulic cylinder (21) and the hinge arm (2), and the connection point between the hydraulic cylinder (21) and the mounting base (1), are both eccentrically set relative to the first rotation axis.

2. The automobile door hinge having a buffering function according to claim 1, wherein, It also includes two rolling bearings (23), which are spaced apart between the hinge arm (2) and the hinge pin (11) along the direction of the first rotation axis.

3. The automobile door hinge with a buffering function according to claim 1, characterized in that, It also includes an anti-wear pad (24), which is disposed between the hinge arm (2) and the mounting base (1).

4. A car door hinge with a buffer function according to claim 1, characterized in that, The hydraulic cylinder (21) includes a cylinder body and a push rod (213); the cylinder body is connected to the hinge arm (2), and the push rod (213) is connected to the mounting base (1).

5. The automobile door hinge having a buffering function according to claim 4, wherein An ear plate (32) is provided on the mounting base (1); the push rod (213) is rotatably connected to the ear plate (32) through a rotating joint (3).

6. The automobile door hinge having a buffering function according to claim 5, wherein The rotating pair (3) includes a rotating shaft (31); the push rod (213) is rotatably connected to the rotating shaft (31).

7. The automobile door hinge having a buffering function according to claim 1, wherein The hinge pin (11) is located on one side of the hinge arm (2), and the hydraulic cylinder (21) is located on the other side of the hinge arm (2) away from the hinge pin (11).

8. The automobile door hinge having a buffering function according to claim 4, wherein The cylinder body of the hydraulic cylinder (21) is fixedly connected to the hinge arm (2).

9. The automobile door hinge having a buffering function according to claim 4, wherein The hydraulic cylinder (21) also includes a connecting column (211) and a piston (212).

10. The automotive door hinge having a buffering function according to claim 5, wherein The rotating pair (3) is a columnar structure or a plate-like structure.

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