A hinge mechanism for a driver's cab door

Abstract

This utility model discloses a hinge mechanism for a driver's cab door, including a first bracket, a U-shaped bracket, and a limiting shaft. The limiting shaft passes through the U-shaped bracket. One end of the first bracket is connected to the driver's cab door, and the other end is hinged to the limiting shaft on the U-shaped bracket. Limiting portions are provided on both sides of the end of the first bracket that is hinged to the limiting shaft. The limiting portions and the first bracket are integral structures. When the driver's cab door rotates open, it drives the first bracket to rotate synchronously, causing the limiting portions to abut against the side end face of the U-shaped bracket. By using an integral first bracket with limiting portions to achieve surface contact limiting with the side end face of the U-shaped bracket, the original thin plate welding and limiting pin line contact method is replaced, improving the overall structural strength and impact resistance of the hinge mechanism. The integrated design of the bent plate and sleeve, as well as the transverse reinforcing rib structure, improves the rigidity and deformation resistance of the components.

Description

Technical Field

[0001] This utility model relates to a hinge mechanism for a driver's cab door, belonging to the technical field of engineering machinery. Background Technology

[0002] Currently, the hinge structure on the cab door includes a hinge frame mounted on the cab door, which is welded from thin plates; a U-shaped bracket mounted on the door frame pillar; a connecting pin and a limiting pin mounted on the U-shaped bracket. The two ends of the hinge frame are connected to the cab door and the connecting pin, respectively. After rotating around the connecting pin, the hinge frame abuts against the outer surface of the limiting pin, forming a line-surface contact. This structure is relatively complex, has poor assembly processability, is not convenient for assembly and fine-tuning, occupies a large space, and has poor welding precision and weld formation. Moreover, it is a non-reinforced structure with poor load strength and insufficient rigidity, making it prone to deformation. At the same time, the frequent collisions between the hinge frame and the limiting pin on the cab door can easily cause the limiting pin to deform, which in turn reduces the sealing reliability of the door under the action of gravity and vibration. Summary of the Invention

[0003] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides a hinge mechanism for a driver's cab door. The device adopts a method in which the limiting part of the first bracket contacts the surface of the U-shaped bracket, thereby solving the problems of easy deformation of the limiting pin and poor overall assembly processability.

[0004] Technical solution: A hinge mechanism for a driver's cab door includes a first bracket, a U-shaped bracket, and a limiting shaft. The limiting shaft passes through the U-shaped bracket. One end of the first bracket is connected to the driver's cab door, and the other end is hinged to the limiting shaft on the U-shaped bracket. Limiting portions are provided on both sides of the end of the first bracket that is hinged to the limiting shaft. The limiting portions and the first bracket are integral structures. When the driver's cab door is rotated open, it drives the first bracket to rotate synchronously, so that the limiting portions abut against the side end face of the U-shaped bracket.

[0005] This utility model achieves surface contact limiting by using a first bracket with a limiting part and the side end face of a U-shaped bracket, replacing the original thin plate welded structure and the contact method of the limiting pin. This significantly improves the structural strength and impact resistance, and solves the problems of insufficient rigidity and easy deformation of the original hinge structure, easy damage to the limiting pin, and reduced door sealing reliability.

[0006] In a preferred embodiment, to improve structural integrity and processing efficiency, the first bracket includes a bent plate bent toward the cab and a sleeve. One end of the bent plate is detachably connected to the cab door, and the other end is fixedly connected to the sleeve. The limiting parts are respectively arranged on both sides of the bent plate near the sleeve end and away from the connection between the sleeve and the bent plate. The sleeve is sleeved on the outer circular surface of the limiting shaft.

[0007] By using a bending plate formed by one-piece bending, the bending plate and the sleeve are integrated and welded together, solving the problems of complex process, poor precision and difficult assembly caused by the original welding of multiple thin plates.

[0008] In a preferred embodiment, to improve the reliability of the limiting mechanism and the durability of the structure, the edge of the limiting part away from the cab is provided with a contact surface in the vertical direction. After the cab door is rotated and closed, the contact surface on the bending plate is in a non-contact state with the U-shaped bracket. After the cab door is rotated and opened, the contact surface on the bending plate abuts against the side end face of the U-shaped bracket.

[0009] By replacing the original line-to-surface contact between the limiting pin and the thin plate welded bracket with a surface-to-surface contact between the contact surface of the limiting part and the side end face of the U-shaped bracket, a larger pressure bearing area is achieved. At the same time, by optimizing the bending angle to match the gas spring stroke, damage to the gas spring caused by excessive door opening is avoided. The bending angle of the bending plate is related to the gas spring formation on the cab door. The maximum standard stroke of the gas spring is usually 10-15mm. The bending angle of the bending plate needs to ensure that the actual maximum opening of the gas spring is less than the maximum standard stroke, to prevent the cab door from opening too wide and causing the gas spring to exceed its maximum standard stroke and be damaged.

[0010] In a preferred embodiment, to enhance the structural rigidity of the bent plate, a reinforcing rib is provided at the bend of the bent plate in the horizontal direction.

[0011] By adding transverse reinforcing ribs at the bends, the deformation resistance is improved, solving the problem that the original thin plate structure is prone to deformation after frequent stress.

[0012] Preferably, to protect the cab door glass and reduce vibration transmission, a rubber pad is provided between one end of the bent plate and the cab door. By providing a rubber pad at the connection, shock absorption and stress dispersion are achieved, preventing direct contact between the first bracket and the glass from causing damage.

[0013] In a preferred embodiment, to limit the axial displacement of the limiting shaft and improve assembly stability, the top end of the limiting shaft is provided with a limiting boss with a diameter larger than the diameter of the limiting shaft. The bottom surface of the limiting boss abuts against the upper end surface of the U-shaped bracket, and a limiting clamp is provided on the outer circumference of the bottom end of the limiting shaft away from the lower end surface of the U-shaped bracket. Through the coordinated limiting design of the limiting boss and the limiting clamp, reliable fixation of the shaft system is achieved, preventing loosening or detachment due to vibration.

[0014] In a preferred embodiment, to improve the smoothness and durability of hinge rotation, the system further includes a grease fitting, an oil injection hole extending axially into the limit shaft, and a connecting hole extending radially from the outer circumference of the limit shaft into the limit shaft, wherein the oil injection hole and the connecting hole are interconnected. By integrating the oil injection channel and the grease fitting, convenient lubrication maintenance is achieved, friction and wear are reduced, and the flexible and reliable opening and closing of the door is ensured.

[0015] In a preferred embodiment, to ensure the coaxiality of the kinematic pair and the effectiveness of lubrication, a bushing is further included between the limiting shaft and the sleeve, the bushing being fitted onto the limiting shaft. By adding a bushing structure, precise fit and oil film retention are achieved between the sleeve and the limiting shaft, further reducing the risk of wear.

[0016] Beneficial Effects: This utility model achieves surface contact limiting by using an integrated first bracket with a limiting part and the side end face of the U-shaped bracket, replacing the original line contact method of thin plate welding and limiting pins, thus improving the overall structural strength and impact resistance of the hinge mechanism. The integrated design of the bending plate and sleeve, along with the transverse reinforcing rib structure, improves the rigidity and deformation resistance of the components. The combination of dual axial fixing by the limiting boss and the clamp, and a lubrication system integrating the oil injection channel and bushing, ensures shaft stability and smooth rotation, extending service life. Furthermore, the matching design between the bending angle and the gas spring stroke prevents damage to accessories caused by excessive door opening. This solution meets the stringent requirements of hinge reliability, durability, and ease of maintenance for cab doors under high-frequency, high-load conditions. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the hinge structure in the prior art of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram showing the contact surface of the driver's cab door abutting against the U-shaped bracket after it is opened. Figure 4 This is a cross-sectional view of the structure of this utility model; Figure 5 This is an internal sectional view of the limiting shaft of this utility model. Detailed Implementation

[0019] 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.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] like Figure 1 The hinge structure shown includes a hinge frame mounted on the cab door, which is made of thin plates and welded together; a U-shaped bracket mounted on the door frame pillar; a connecting pin and a limiting pin mounted on the U-shaped bracket. The two ends of the hinge frame are connected to the cab door and the connecting pin, respectively. After rotating around the connecting pin, the hinge frame abuts against the outer surface of the limiting pin, forming a line-to-surface contact. The thin plates are welded together, specifically a connecting bent plate for welding to the connecting pin and a limiting bent plate for abutting against and limiting the limiting pin. The two are welded together in opposite bending directions. The hinge frame made of thin plates has poor load-bearing strength, insufficient rigidity, and is prone to deformation. It is a non-reinforced structure with a large overall size, poor welding precision, poor weld formation, and poor appearance. In addition, every time the door is opened, the limiting bent plate will hit the limiting pin. Over time, the limiting pin is prone to deformation. Furthermore, due to the precision issues of the manufacturing process, this hinge structure is prone to larger assembly errors and is not easy to fine-tune.

[0023] like Figures 2-5 As shown, a hinge mechanism for a driver's cab door includes a first bracket 1, a U-shaped bracket 2, and a limiting shaft 3. The limiting shaft 3 passes through the U-shaped bracket 2. One end of the first bracket 1 is connected to the driver's cab door 4, and the other end is hinged to the limiting shaft 3 on the U-shaped bracket 2. Limiting portions 5 are provided on both sides of the end of the first bracket 1 that is hinged to the limiting shaft 3. The limiting portions 5 and the first bracket 1 are integral structures. After the driver's cab door 4 is rotated open, it drives the first bracket 1 to rotate synchronously, so that the limiting portions 5 abut against the side end face of the U-shaped bracket 2.

[0024] The first bracket 1 with the limiting part 5 achieves surface contact limiting with the side end face of the U-shaped bracket 2, which replaces the original thin plate welded structure and the contact method of the limiting pin. This significantly improves the structural strength and impact resistance, and solves the problems of insufficient rigidity and easy deformation of the original hinge structure, easy damage of the limiting pin, and reduced door sealing reliability.

[0025] To improve structural integrity and processing efficiency, the first bracket 1 includes a bent plate 11 bent towards the cab and a sleeve 12. One end of the bent plate 11 is detachably connected to the cab door 4, and the other end is fixedly connected to the sleeve 12. The limiting parts 5 are respectively arranged on both sides of the bent plate 11 near the end of the sleeve 12, and away from the connection between the sleeve 12 and the bent plate 11. The sleeve 12 is sleeved on the outer circular surface of the limiting shaft 3. By using a one-piece bent plate 11, the integrated welding of the bent plate 11 and the sleeve 12 is achieved, solving the problems of complex process, poor precision, and difficult assembly caused by the original welding of multiple thin plates.

[0026] To improve the reliability of the limiting position and the durability of the structure, the edge of the limiting part 5 away from the cab is provided with a contact surface 51 in the vertical direction. After the cab door 4 is rotated and closed, the contact surface 51 on the bending plate 11 is in a non-contact state with the U-shaped bracket 2. After the cab door 4 is rotated and opened, the contact surface 51 on the bending plate 11 abuts against the side end face of the U-shaped bracket 2.

[0027] By replacing the original line-to-surface contact between the limiting pin and the thin plate welded bracket with the surface-to-surface contact of the contact surface 51 on the limiting part 5 and the side end face of the U-shaped bracket 2, a larger pressure bearing area is achieved. At the same time, by optimizing the bending angle to match the gas spring stroke, excessive opening of the door is avoided, which could damage the gas spring. The bending angle of the bending plate 11 is related to the formation of the gas spring on the cab door 4. The maximum standard stroke of the gas spring is usually 10-15mm. The bending angle of the bending plate 11 needs to ensure that the actual maximum opening of the gas spring is less than the maximum standard stroke, to prevent the cab door 4 from opening too wide and causing the gas spring to exceed its maximum standard stroke and be damaged.

[0028] To enhance the structural rigidity of the bent plate 11, a reinforcing rib 111 is provided at the bend of the bent plate 11 along the horizontal direction. By providing a transverse reinforcing rib 111 at the bend, the resistance to deformation is improved, solving the problem that the original thin plate structure is prone to deformation after frequent stress.

[0029] To protect the glass of the cab door 4 and reduce vibration transmission, a rubber pad 6 is provided between one end of the bending plate 11 and the cab door 4. By providing the rubber pad 6 at the connection, shock absorption and stress dispersion are achieved, preventing the first bracket 1 from directly contacting the glass and causing damage.

[0030] To limit the axial displacement of the limiting shaft 3 and improve assembly stability, a limiting boss 31 with a diameter larger than that of the limiting shaft 3 is provided at the top end of the limiting shaft 3. The bottom surface of the limiting boss 31 abuts against the upper end surface of the U-shaped bracket 2, and a limiting clamp 7 is provided on the outer circular surface of the bottom end of the limiting shaft 3 away from the lower end surface of the U-shaped bracket 2. Through the coordinated limiting design of the limiting boss 31 and the limiting clamp 7, reliable fixation of the shaft system is achieved, avoiding loosening or detachment due to vibration. Example 1

[0031] To improve the smoothness and durability of hinge rotation, the system also includes a grease nipple 8, an oil injection hole 32 extending axially into the limiting shaft 3, and a connecting hole 33 extending radially from the outer circumference of the limiting shaft 3 into its interior. The oil injection hole 32 and the connecting hole 33 are interconnected. By integrating the oil injection channel with the grease nipple 8, convenient lubrication and maintenance are achieved, friction and wear are reduced, and the door opening and closing is ensured to be flexible and reliable. Example 2

[0032] To ensure the coaxiality and lubrication effectiveness of the moving parts, a bushing 8 is also included, which is disposed between the limiting shaft 3 and the sleeve 12 and is fitted onto the limiting shaft 3. By adding the bushing 8, a precise fit and oil film retention are achieved between the sleeve 12 and the limiting shaft 3, further reducing the risk of wear. In this embodiment, a shim can also be provided between the limiting shaft 3 and the sleeve 12 to facilitate assembly and fine-tuning.

[0033] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hinge mechanism for a cab door, characterised in that: It includes a first bracket (1), a U-shaped bracket (2), and a limiting shaft (3). The limiting shaft (3) passes through the U-shaped bracket (2). One end of the first bracket (1) is connected to the cab door (4), and the other end is hinged to the limiting shaft (3) on the U-shaped bracket (2). Limiting parts (5) are provided on both sides of the end of the first bracket (1) that is hinged to the limiting shaft (3). The limiting part (5) and the first bracket (1) are an integral structure. After the cab door (4) is rotated and opened, it drives the first bracket (1) to rotate synchronously, so that the limiting part (5) abuts against the side end face of the U-shaped bracket (2).

2. A cab door hinge mechanism according to claim 1, characterised in that: The first bracket (1) includes a bent plate (11) bent towards the cab and a sleeve (12). One end of the bent plate (11) is detachably connected to the cab door (4), and the other end is fixedly connected to the sleeve (12). The limiting part (5) is respectively set on both sides of the bent plate (11) near the end of the sleeve (12) and away from the connection between the sleeve (12) and the bent plate (11). The sleeve (12) is sleeved on the outer circle of the limiting shaft (3).

3. A cab door hinge mechanism according to claim 2, characterised in that: The limiting part (5) has a contact surface (51) on the edge away from the cab in the vertical direction. After the cab door (4) is rotated and closed, the contact surface (51) on the bending plate (11) is in a non-contact state with the U-shaped bracket (2). After the cab door (4) is rotated and opened, the contact surface (51) on the bending plate (11) abuts against the side end face of the U-shaped bracket (2).

4. A cab door hinge mechanism according to claim 3, characterised in that: The bending plate (11) is provided with a reinforcing rib (111) in the horizontal direction at the bending point.

5. The cab door hinge mechanism of claim 2, wherein: A rubber pad (6) is provided between one end of the bending plate (11) and the cab door (4).

6. The cab door hinge mechanism of claim 2, wherein: The top of the limiting shaft (3) is provided with a limiting boss (31) with a diameter larger than that of the limiting shaft (3). The bottom surface of the limiting boss (31) abuts against the upper surface of the U-shaped bracket (2). A limiting clamp (7) is provided on the bottom outer circle surface of the limiting shaft (3) away from the lower surface of the U-shaped bracket (2).

7. A cab door hinge mechanism according to claim 6, characterised in that: It also includes a grease nipple (8), an oil injection hole (32) opened along the axial direction of the limiting shaft (3) to the inside of the limiting shaft (3), and a connecting hole (33) opened radially from its outer circle to the inside of the limiting shaft (3), wherein the oil injection hole (32) and the connecting hole (33) are connected.

8. A cab door hinge mechanism according to claim 7, characterised in that: It also includes a bushing (9) disposed between the limiting shaft (3) and the sleeve (12), the bushing (9) being sleeved on the limiting shaft (3).

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