Vehicle door hinge assembly and forklift
The concealed four-bar linkage door hinge assembly solves the problem of limited opening angle of traditional forklift door hinges, enabling large-angle opening, improving maintenance efficiency and appearance, reducing the risk of damage, and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional forklift door hinge structures result in limited door opening angles, affecting maintenance space and efficiency. Furthermore, the exposed design impacts aesthetics, makes the doors more susceptible to damage, shortens their lifespan, and reduces safety.
The door hinge assembly employs a concealed four-bar linkage, including first and second connectors, a fixed component, and a movable component bracket, enabling a wide-angle opening. Wear is reduced through bushings and limit pins, and the design conceals it inside the door.
It enables the doors to open at a wide angle, improves maintenance efficiency and aesthetics, reduces the risk of collision damage, extends hinge life, and enhances safety.
Smart Images
Figure CN224064145U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engineering machinery technology, and in particular to a door hinge assembly and a forklift. Background Technology
[0002] Door hinges, as a key component connecting the door to the chassis, play a crucial role in forklift design and use. The ease of door opening and closing is paramount in the daily use and maintenance of forklifts. However, traditional door hinge structures have many limitations, especially the limited opening angle, typically only allowing the door to open to a relatively fixed and limited range. This results in a cramped operating space, making it difficult for maintenance personnel to obtain sufficient operating space when repairing, replacing, or inspecting internal forklift components. The use of maintenance tools is also greatly restricted, significantly impacting maintenance efficiency and work quality.
[0003] In addition, traditional forklift door hinges mostly adopt an exposed structure, which has obvious drawbacks: on the one hand, it destroys the simplicity and aesthetics of the overall appearance of the forklift; on the other hand, exposed hinges are easily damaged by external forces such as collisions and scratches during operation, resulting in hinge damage or abnormal door opening and closing, affecting normal use.
[0004] Furthermore, exposed hinges, due to their long-term exposure to the external environment, are prone to accumulating dust and impurities. This not only accelerates hinge wear and reduces safety but also shortens their lifespan and affects reliability. More seriously, this wear can further affect the sealing and safety of the forklift doors, posing a potential threat to the personal safety of operators. Utility Model Content
[0005] Therefore, the purpose of this utility model is to provide a door hinge assembly and a forklift, thereby solving at least one of the shortcomings of existing door hinges.
[0006] To achieve the above objectives, the first aspect of this utility model provides a car door hinge assembly, including at least two hinges. Each hinge includes a first connector, a fixed bracket fixed to the vehicle frame, and a movable bracket fixed to the car door. The two ends of the first connector are respectively hinged to the fixed bracket and the movable bracket. At least one of the at least two hinges is provided with a second connector, the two ends of which are respectively hinged to the fixed bracket and the movable bracket. The first connector, the second connector, the fixed bracket, and the movable bracket form a four-bar linkage.
[0007] Furthermore, the fixing bracket includes an upper fixing bracket and a lower fixing bracket located on the upper and lower sides of the first connector, respectively, and the movable bracket includes an upper movable bracket and a lower movable bracket located on the upper and lower sides of the first connector, respectively.
[0008] Furthermore, the first connector is an arc-shaped plate structure, and each end of the first connector is provided with a shaft hole. The first connector is hinged to the fixed component bracket and the movable component bracket through the shaft hole and the first pin.
[0009] Furthermore, the second connector has an arc-shaped rod structure, and shaft holes are provided at both ends of the second connector. The second connector is hinged to the upper fixed bracket and the upper movable bracket through the shaft holes and the second pin.
[0010] Furthermore, bushings are fitted on the outer sides of the first pin and the second pin.
[0011] Furthermore, the ends of the first pin and the second pin are provided with limiting pins to restrict their axial movement.
[0012] Furthermore, spacers are also provided on the first pin and the second pin.
[0013] Furthermore, the door hinge assembly is connected to the inside of the vehicle frame and the door.
[0014] The second aspect of this utility model provides a forklift, including a door hinge assembly as described in any of the above claims.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] In this embodiment, the door hinge assembly allows one end of the first connector to rotate around a fixed bracket on the frame when the door is opened, while the other end rotates around a movable bracket on the door. This continues until both ends of the first connector reach their limit positions, achieving a large-angle opening of the door. This greatly facilitates the maintenance of forklift parts and significantly improves the efficiency and operability of daily forklift maintenance. Furthermore, the hinge features a concealed design, which not only enhances the overall simplicity of the forklift's appearance but also reduces the risk of collision damage caused by exposed hinges, extending the hinge's lifespan. Attached Figure Description
[0017] Figure 1 This is a structural schematic diagram of the door hinge assembly of this utility model;
[0018] Figure 2 This is a structural schematic diagram of the fastener bracket of this utility model;
[0019] Figure 3 This is a schematic diagram of the structure of the movable component bracket of this utility model;
[0020] Figure 4 This is an exploded view of the structure of the door hinge assembly of this utility model;
[0021] Figure 5 This is an exploded view of the structure of the first connecting member and the fixing member bracket of this utility model;
[0022] Figure 6 This is an exploded view of the structure of the second connecting member and the fixing member bracket of this utility model;
[0023] In the picture:
[0024] 1. Second connecting piece; 2. Upper fixing bracket; 3. Bushing; 4. Lower fixing bracket; 5. Frame; 6. Spacer; 7. Limiting pin; 8. Door; 9. First pin; 10. Lower movable bracket; 11. First connecting piece; 12. Upper movable bracket; 13. Second pin. Detailed Implementation
[0025] To facilitate understanding of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0026] The present invention will now be described in detail. In the following paragraphs, different aspects of the embodiments are defined in more detail. These aspects may be combined with any other aspect or multiple aspects unless explicitly stated otherwise. In particular, any feature considered preferred or advantageous may be combined with one or more other features considered preferred or advantageous.
[0027] In the description of this utility model, it should be understood that the terms "inner", "outer", "upper", "lower", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.
[0028] refer to Figure 1 , Figure 4As shown, this utility model discloses a car door hinge assembly, connected between the inner side of the vehicle frame 5 and the car door 8, including at least two hinges. Each hinge includes a first connecting member 11, a fixed member bracket fixed to the vehicle frame 5, and a movable member bracket fixed to the car door 8. The two ends of the first connecting member 11 are respectively hinged to the fixed member bracket and the movable member bracket. At least one of the at least two hinges is provided with a second connecting member 1, the two ends of which are respectively hinged to the fixed member bracket and the movable member bracket. The first connecting member 11, the second connecting member 1, the fixed member bracket, and the movable member bracket form a four-bar linkage.
[0029] When the door 8 is opened, one end of the first connecting member 11 rotates around the fixed bracket fixed to the frame 5, and the other end rotates around the movable bracket fixed to the door 8, until both ends of the first connecting member 11 rotate to their limit positions, thereby achieving a large-angle opening of the door. The first connecting member 11, the second connecting member 1, the fixed bracket, and the movable bracket form a four-bar linkage to ensure the movement trajectory of the hinge, allowing the hinge to rotate in a preset direction, ensuring the convenience and reliability of opening and closing the door. The door hinge assembly of this embodiment achieves a large-angle opening of the door, greatly facilitating the maintenance of forklift parts and significantly improving the efficiency and operability of daily forklift maintenance. Furthermore, the hinge adopts a hidden design, which not only improves the simplicity of the overall appearance of the forklift but also reduces the risk of collision damage caused by exposed hinges and extends the service life of the hinges.
[0030] refer to Figures 2 to 3 As shown, in some embodiments, the fixing bracket includes an upper fixing bracket 2 and a lower fixing bracket 4 located on the upper and lower sides of the first connecting member 11, respectively. The upper fixing bracket 2 and the lower fixing bracket 4 are welded to the inner side of the frame 5, are parallel to each other, and each has a coaxial shaft hole in its middle for mounting the first connecting member 11. The movable bracket includes an upper movable bracket 12 and a lower movable bracket 10 located on the upper and lower sides of the first connecting member 11, respectively. The upper movable bracket 12 and the lower movable bracket 10 are welded to the inner side of the door 8, are parallel to each other, and each has a large coaxial shaft hole in its middle for mounting the first connecting member 11.
[0031] refer to Figure 5 As shown, the first connecting member 11 is an arc-shaped plate structure. The two ends of the first connecting member 11 are respectively provided with shaft holes. One end of the first connecting member 11 is hinged between the upper fixed member bracket 2 and the lower fixed member bracket 4 through the shaft hole and the first pin 9, and the other end is hinged between the upper movable member bracket 12 and the lower movable member bracket 10 through the shaft hole and the first pin 9.
[0032] refer to Figure 6 As shown, the second connecting member 1 is further in the form of an arc-shaped rod structure. The two ends of the second connecting member 1 are respectively provided with shaft holes. The upper fixed member bracket 2 is provided with a small shaft hole at the end away from the frame 5. The upper movable member bracket 12 is provided with a small shaft hole at the end away from the door 8. The second connecting member 1 is hinged to the upper fixed member bracket 2 and the upper movable member bracket 12 through the shaft holes and the second pin 13.
[0033] In some embodiments, bushings 3 are fitted around the outer sides of the first pin 9 and the second pin 13. Specifically, bushings 3 are fitted at both ends of the area where the first pin 9 is rotatably connected to the first connector 11, in the area where the first pin 9 is rotatably connected to the fixed bracket, and in the area where the first pin 9 is rotatably connected to the movable bracket. When the first connector 11 rotates around the first pin 9, the bushings 3 can reduce wear between the first connector 11 and the first pin 9, and also serve to fix the position of the first connector 11. When the first pin 9 rotates relative to the fixed bracket and the movable bracket, the bushings 3 can reduce wear between the first connector 11 and the fixed bracket and the movable bracket. In addition, bushings 3 are fitted in the area where the second pin 13 is rotatably connected to the second connector 1, to reduce wear between the second pin 13 and the second connector 1.
[0034] In some embodiments, the ends of the first pin 9 and the second pin 13 are provided with limiting pins 7 to restrict their axial movement. The limiting pins 7 are detachably connected to the first pin 9 and the second pin 13.
[0035] In some embodiments, a spacer 6 is also provided on the first pin 9 and the second pin 13. The spacer 6 is provided between the first connecting member 11 and the fixed member bracket and the movable member bracket, and between the limiting pin 7 and the fixed member bracket and the movable member bracket, to reduce wear between these components and improve the stability of the hinge structure.
[0036] This utility model also discloses a forklift, including the aforementioned door hinge assembly.
[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A vehicle door hinge assembly, characterized by, The door hinge assembly comprises at least two hinges, each of which comprises a first connecting piece (11), a fixed piece support fixed on a vehicle frame (5), and a movable piece support fixed on a vehicle door (8), two ends of the first connecting piece (11) are hingedly connected with the fixed piece support and the movable piece support respectively, and at least one of the at least two hinges is provided with a second connecting piece (1), two ends of the second connecting piece (1) are hingedly connected with the fixed piece support and the movable piece support respectively, and the first connecting piece (11), the second connecting piece (1), the fixed piece support and the movable piece support form a four-bar mechanism.
2. The vehicle door hinge assembly of claim 1, wherein, The fixed piece support comprises an upper fixed piece support (2) and a lower fixed piece support (4) located on the upper and lower sides of the first connecting piece (11) respectively, and the movable piece support comprises an upper movable piece support (12) and a lower movable piece support (10) located on the upper and lower sides of the first connecting piece (11) respectively.
3. The vehicle door hinge assembly of claim 1, wherein, The first connecting piece (11) is in an arc-shaped plate structure, two ends of the first connecting piece (11) are provided with shaft holes respectively, and the first connecting piece (11) is hingedly connected with the fixed piece support and the movable piece support through the shaft holes and a first pin shaft (9).
4. The vehicle door hinge assembly of claim 3, wherein, The second connecting piece (1) is in an arc-shaped rod structure, two ends of the second connecting piece (1) are provided with shaft holes respectively, and the second connecting piece (1) is hingedly connected with the upper fixed piece support (2) and the upper movable piece support (12) through the shaft holes and a second pin shaft (13).
5. The vehicle door hinge assembly of claim 4, wherein, The outer sides of the first pin shaft (9) and the second pin shaft (13) are provided with shaft sleeves (3).
6. The vehicle door hinge assembly of claim 4, wherein, End portions of the first pin shaft (9) and the second pin shaft (13) are provided with limiting pins (7) for limiting axial movement.
7. The vehicle door hinge assembly of claim 4, wherein, The first pin shaft (9) and the second pin shaft (13) are further provided with spacer sleeves (6).
8. The vehicle door hinge assembly of claims 1-7, wherein, The door hinge assembly is connected to the inner sides of the vehicle frame (5) and the vehicle door (8).
9. A fork lift truck characterised in that, The door hinge assembly comprises any one of claims 1-8.