Loader frame hinge structure

Abstract

A loader frame articulation structure, belonging to the field of engineering machinery, includes a front frame and a rear frame, connected by an articulation assembly. The articulation assembly includes an articulation shaft, which is fixedly mounted on the front frame, and the rear frame is rotatably connected to the articulation shaft. The articulation shaft includes a cylindrical portion and a truncated cone portion. The truncated cone portion is fixedly mounted on the upper end of the cylindrical portion and installed within an articulation hole in the front frame. A mounting plate is mounted on the upper end of the truncated cone portion, and the mounting plate is fixedly connected to the front frame by bolts. The cylindrical portion is rotatably connected to the rear frame, and the lower end of the cylindrical portion is connected to the articulation hole on the front frame via a bushing. The use of a conical surface fit at the loader's articulation structure significantly improves the assembly accuracy and connection strength at the articulation point, thereby solving the connection strength problem at the articulation point under extreme working conditions and the fatigue wear problem caused by the increasing use time of the loader, effectively reducing the failure rate of the loader product.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to a hinged structure for a loader frame. Background Technology

[0002] A loader is a type of earthmoving machinery that uses a bucket to scoop up materials for cyclical operations. It is mainly used for loading earth and loose materials, and can also be used for surface stripping of soft soil, ground leveling, and site clearing.

[0003] A loader consists of a front frame and a rear frame. The front frame carries the working device (bucket, boom, etc.) and transmits power, while the rear frame houses the engine, gearbox, drive axle, cab, radiator, hood lights, and other components, as well as auxiliary steering. The loader's frame has an articulated structure (such as...) Figure 1 As shown in the figure, as an important load-bearing and connecting component of the loader, its front side is used to connect to the front frame and its rear side is used to connect to the rear frame. At the same time, it also takes into account the steering function of the whole machine and plays a decisive role in the performance, stability and service life of the whole machine.

[0004] Existing loader articulated structures (such as) Figure 2 As shown, the hinge shaft has a cylindrical structure. Due to the high precision requirements of the components at the hinge, and the fact that manufacturing and assembly often fail to meet these requirements, stress concentration or large assembly errors can easily occur at the hinge positions of the front and rear frames. This can lead to wear or loosening of the hinge shaft after prolonged operation, affecting the reliability and efficiency of the entire machine. Furthermore, under overload or extreme operating conditions, the hinge structure may be at risk of direct failure, directly impacting the safety and service life of the entire machine. Utility Model Content

[0005] To address the technical problems of existing loader frame articulation structures, where the articulation shaft is cylindrical, requiring high precision in machining and installation, and prone to wear or loosening after prolonged operation, this utility model provides a loader frame articulation structure.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a loader frame articulation structure, including a front frame and a rear frame, which are connected by an articulation assembly. The articulation assembly includes an articulation shaft, which is fixedly mounted on the front frame and rotatably connected to the rear frame. The articulation shaft includes a cylindrical part and a truncated cone part. The truncated cone part is fixedly mounted on the upper end of the cylindrical part and installed in the articulation hole of the front frame. A mounting plate is installed on the upper end of the truncated cone part, and the mounting plate is fixedly connected to the front frame by bolts. The cylindrical part is rotatably connected to the rear frame, and the lower end of the cylindrical part is connected to the articulation hole on the front frame through a bushing. The articulation structure of the loader uses a conical surface fit, which greatly improves the assembly accuracy and connection strength at the articulation structure. This solves the connection strength problem at the articulation point of the loader under extreme working conditions, as well as the fatigue wear problem caused by the increase of the loader's service time, effectively reducing the failure rate of the loader product and improving the service life of the whole machine.

[0008] Preferably, a first hinge hole and a second hinge hole are provided at the position where the front frame connects to the hinge assembly. The first hinge hole and the second hinge hole are arranged vertically. The first hinge hole is a conical hole. The truncated cone part is installed in the first hinge hole, and the lower end of the cylindrical part is installed in the second hinge hole. The conical hole can achieve a fit with the conical surface of the truncated cone part and reduce local contact stress.

[0009] Preferably, the hinge shaft is fixedly connected to the mounting plate by screws, eliminating the welding operation, avoiding the deformation and stress concentration problems caused by the high temperature of welding, and improving the overall service life of the hinge shaft.

[0010] Preferably, the mounting plate is fixedly connected to the front frame with bolts, which effectively restricts the position of the articulation shaft and ensures an effective connection between the front frame and the rear frame.

[0011] Preferably, a threaded hole is provided at the lower end of the cylindrical part, and a bushing is fitted onto the lower end of the cylindrical part. The bushing is fixedly connected to the cylindrical part by screws. On the one hand, this improves the wear resistance of the hinge shaft, thereby improving the overall reliability of the hinge structure. On the other hand, by replacing the bushing, the requirements for the machining accuracy of the cylindrical part can be reduced.

[0012] Preferably, the bushing includes a cylindrical insertion part, the lower end of the cylindrical part is inserted into the insertion part, the outer diameter of the insertion part is the same as the inner diameter of the second hinge hole, and the lower end of the insertion part is fixedly connected to a limiting part, which is a plate-shaped structure. The size of the limiting part is larger than the outer diameter of the insertion part. By cooperating with the mounting plate, the position of the hinge shaft on the front frame is restricted, and the wobbling and axial movement of the hinge shaft are avoided.

[0013] Preferably, the length of the insertion part is the same as the depth of the second hinge hole, which ensures uniform force distribution and improves the aesthetics of the installation.

[0014] Preferably, a third hinge hole is provided on the rear frame, and a bearing is fixedly installed in the third hinge hole. The inner ring of the bearing is fixedly connected to the cylindrical part, which improves the smoothness of rotation between the rear frame and the hinge shaft.

[0015] Preferably, there are two sets of articulation components, which are arranged opposite each other to ensure the connection stability between the rear frame and the front frame.

[0016] Preferably, the minimum diameter of the truncated cone portion is not less than that of the cylindrical portion, which not only facilitates the improvement of the strength of the hinge shaft, but also facilitates the installation and use of the hinge shaft.

[0017] As can be seen from the above technical solutions, the advantages of this utility model are:

[0018] 1. The conical surface fit between the truncated cone and the first hinge hole can evenly distribute the load and significantly reduce local contact stress. At the same time, during the operation of the whole machine, the conical surface fit can simultaneously transmit radial force, axial force and torque, and has a stronger load-bearing capacity. When the middle hinge of the whole machine is subjected to frequent impacts, the conical surface fit effectively improves the fatigue life of the hinge structure. Moreover, the conical surface fit can simplify the assembly process of the hinge shaft and the hinge hole, reduce manual adjustment time, and the conical surface fit can simultaneously improve the radial and axial assembly accuracy of the hinge shaft, achieve precise alignment, and in the middle hinge structure with a large opening, it can better ensure the coaxiality of the upper and lower hinge shafts and avoid bearing wear caused by assembly errors.

[0019] 2. The hinge shaft is fixedly connected to the mounting plate with screws, eliminating the welding operation and avoiding the deformation and stress concentration problems caused by the high temperature of welding, thus improving the overall service life of the hinge shaft.

[0020] 3. A threaded hole is provided at the lower end of the cylindrical part, and a bushing is fitted onto the lower end of the cylindrical part. The bushing is fixedly connected to the cylindrical part by screws. On the one hand, this improves the wear resistance of the hinge shaft, thereby improving the overall reliability of the hinge structure. On the other hand, by replacing the bushing, the requirements for the machining accuracy of the cylindrical part can be reduced. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0022] Figure 1 A schematic diagram of the overall structure of the articulated loader frame structure in the background technology;

[0023] Figure 2A partial cross-sectional schematic diagram of the articulated structure of a loader frame, as shown in the background technology;

[0024] Figure 3 This is a partial cross-sectional structural diagram of the loader frame articulation structure according to one or more embodiments of the present invention;

[0025] Figure 4 This is an exploded structural diagram of the hinge shaft according to one or more embodiments of the present invention.

[0026] Figure 5 This is an exploded structural diagram of the hinge assembly according to one or more embodiments of the present invention.

[0027] The components represented by the various reference numerals in the diagram are:

[0028] 1. Front frame; 2. Rear frame; 3. Articulation assembly; 4. Articulation shaft; 5. Bearing; 6. End cap; 7. Sealing ring; 8. Cylindrical part; 9. Frustum conical part; 10. Mounting plate; 11. Screw; 12. Threaded hole; 13. Connecting hole; 14. Mounting hole; 15. Washer; 16. Bushing; 17. Insertion part; 18. Limiting part; 19. First hinge hole; 20. Second hinge hole; 21. Third hinge hole; 22. Bolt. Detailed Implementation

[0029] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0030] Example 1

[0031] In a typical embodiment of this utility model, such as Figures 3-5 As shown, a loader frame articulation structure is proposed, including: a front frame 1, a rear frame 2 and an articulation assembly 3. The articulation assembly 3 is provided in two sets, and the two sets of articulation assemblies 3 are arranged vertically opposite each other. The front frame 1 and the rear frame 2 are hinged together by the vertically opposite articulation assemblies 3. Both the front frame 1 and the rear frame 2 are provided with articulation holes for the installation of the articulation assembly 3.

[0032] like Figure 3 As shown, the articulation assembly 3 includes an articulation shaft 4, a bearing 5, and a bushing 16. The articulation shaft 4 is fixedly installed on the front frame 1, and the bearing 5 is fixedly installed on the rear frame 2. The rear frame 2 is rotatably connected to the articulation shaft 4 through the bearing 5, thereby realizing the articulation between the front frame 1 and the rear frame 2.

[0033] The hinge shaft 4 includes a cylindrical part 8 and a truncated cone part 9. The truncated cone part 9 is fixedly installed on the upper end of the cylindrical part 8. The minimum diameter of the truncated cone part 9 is not less than that of the cylindrical part 8. The truncated cone part 9 is installed in the hinge hole of the front frame 1. The upper end of the truncated cone part 9 is detachably installed with a mounting plate 10. The mounting plate 10 is fixedly connected to the front frame 1 by bolts 22. The cylindrical part 8 is fixedly connected to the inner ring of the bearing 5. The lower end of the cylindrical part 8 is connected to the hinge hole on the front frame 1 through a bushing 16.

[0034] like Figure 5 As shown, the front frame 1 has two hinge holes at the position for connecting with the hinge assembly 3, namely a first hinge hole 19 and a second hinge hole 20. The first hinge hole 19 and the second hinge hole 20 are arranged vertically. The first hinge hole 19 is a conical hole structure, and the second hinge hole 20 is a through hole structure. The first hinge hole 19 is used for the installation of the truncated cone part 9, and the second hinge hole 20 is used for the installation of the lower end of the cylindrical part 8. The rear frame 2 has a third hinge hole 21 at the position for connecting with the hinge assembly 3, and the bearing 5 is fixedly installed in the third hinge hole 21.

[0035] The fit between the truncated cone 9 and the first hinge hole 19 can evenly distribute the load and significantly reduce local contact stress. At the same time, during the operation of the whole machine, the conical fit can simultaneously transmit radial force, axial force and torque, and has a stronger load-bearing capacity. When the middle hinge of the whole machine is subjected to frequent impacts, the conical fit effectively improves the fatigue life of the hinge structure. Moreover, the conical fit can simplify the assembly process of the hinge shaft 4 and the hinge hole, reduce manual adjustment time, and the conical fit can simultaneously improve the radial and axial assembly accuracy of the hinge shaft, achieve precise alignment, and in the middle hinge structure with a large opening, it can better ensure the coaxiality of the upper and lower hinge shafts 4 and avoid bearing wear caused by assembly errors.

[0036] The hinge shaft 4 is fixedly connected to the mounting plate 10 by screws 11, such as Figure 4 As shown, the mounting plate 10 is larger than the truncated cone portion 9. A threaded hole 12 is provided in the middle of the truncated cone portion 9 for threaded connection with the screw 11. A connecting hole 13 is provided in the middle of the mounting plate 10. The number of connecting holes 13 is the same as the number of threaded holes 12 and they correspond one-to-one. They are used for the installation of the screw 11. After the screw 11 passes through the connecting hole 13, it is threadedly connected to the threaded hole 12 to realize the detachable connection between the mounting plate 10 and the truncated cone portion 9. A washer 15 is provided between the screw 11 and the mounting plate 10 to reduce the wear between the screw 11 and the mounting plate 10. Several mounting holes 14 are also provided on the mounting plate 10 along its circumference. The mounting holes 14 are used for the installation of bolts 22 to fix the mounting plate 10 to the front frame 1 together with the bolts 22 to limit the position of the hinge shaft 4.

[0037] Because uneven heating during welding can cause deformation and shrinkage stress in the parts, and the high temperature of welding can change the properties of the base material, potentially causing embrittlement and reducing the hardness of the hinge shaft 4, this embodiment uses screws 11 to connect the mounting plate 10 to the truncated cone portion 9, eliminating the welding operation and avoiding the problems of deformation and stress concentration caused by the high temperature of welding.

[0038] like Figure 3 As shown, the lower end of the cylindrical part 8 is also provided with a threaded hole 12 for threaded connection with the screw 11. The bushing 16 is sleeved on the lower end of the cylindrical part 8 and is fixedly connected to the cylindrical part 8 by the screw 11.

[0039] like Figure 5 As shown, the bushing 16 includes an insertion part 17 and a limiting part 18. The insertion part 17 has a cylindrical structure with an open upper end. The inner diameter of the upper end of the insertion part 17 is the same as the outer diameter of the lower end of the cylindrical part 8, so as to be fitted onto the cylindrical part 8. The outer diameter of the insertion part 17 is the same as the inner diameter of the second hinge hole 20, so as to be inserted into the second hinge hole 20. On the one hand, this improves the wear resistance of the hinge shaft 4, thereby improving the overall reliability of the hinge structure. On the other hand, by replacing the bushing 16, the requirements for the machining accuracy of the cylindrical part 8 can be reduced.

[0040] In this embodiment, the length of the insertion part 17 is the same as the depth of the second hinge hole 20. The limiting part 18 is fixedly disposed at the lower end of the insertion part 17. The limiting part 18 is a plate-shaped structure (such as a circular plate, a rectangular plate, etc.) to block the lower end of the insertion part 17. The size of the limiting part 18 is larger than the outer diameter of the insertion part 17 to limit the position of the insertion part 17. A through hole is provided at the middle position of the limiting part 18 for the installation of the screw 11. The screw 11 is used to fix the bushing 16 to the lower end of the cylindrical part 8. Then, through the cooperation of the limiting part 18 and the mounting plate 10, the position of the hinge shaft 4 on the front frame 1 is limited to avoid the shaking and axial movement of the hinge shaft 4.

[0041] like Figure 5 As shown, a third hinge hole 21 is provided on the rear frame 2. The bearing 5 is installed in the third hinge hole 21. Both the upper and lower ends of the bearing 5 are provided with end caps 6. The end caps 6 are fixedly connected to the rear frame 2 by bolts 22 to restrict the position of the bearing 5. A sealing ring 7 is provided between the end cap 6 and the cylindrical part 8 to play a sealing role.

[0042] 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 loader frame articulation structure, comprising: A front frame (1) and a rear frame (2) are connected by a hinge assembly (3), characterized in that the hinge assembly (3) includes a hinge shaft (4), the hinge shaft (4) is fixedly installed on the front frame (1), and the rear frame (2) is rotatably connected to the hinge shaft (4); The hinge shaft (4) includes a cylindrical part (8) and a truncated cone part (9). The truncated cone part (9) is fixedly installed on the upper end of the cylindrical part (8). The truncated cone part (9) is installed in the hinge hole of the front frame (1). The upper end of the truncated cone part (9) is equipped with a mounting plate (10). The mounting plate (10) is fixedly connected to the front frame (1) by bolts (22). The cylindrical part (8) is rotatably connected to the rear frame (2). The lower end of the cylindrical part (8) is connected to the hinge hole on the front frame (1) through a bushing (16).

2. The loader frame articulated structure according to claim 1, characterized in that, The front frame (1) is provided with a first hinge hole (19) and a second hinge hole (20) at the connection position of the hinge assembly (3). The first hinge hole (19) and the second hinge hole (20) are arranged vertically. The first hinge hole (19) is a conical hole. The truncated cone part (9) is installed in the first hinge hole (19), and the lower end of the cylindrical part (8) is installed in the second hinge hole (20).

3. The loader frame articulated structure according to claim 1, characterized in that, The hinge shaft (4) is fixedly connected to the mounting plate (10) by screws (11).

4. The loader frame articulated structure according to claim 3, characterized in that, The mounting plate (10) is fixedly connected to the front frame (1) by bolts (22).

5. The loader frame articulated structure according to claim 2, characterized in that, A threaded hole (12) is provided at the lower end of the cylindrical part (8), and a bushing (16) is fitted on the lower end of the cylindrical part (8). The bushing (16) is fixedly connected to the cylindrical part (8) by a screw (11).

6. The loader frame articulated structure according to claim 5, characterized in that, The bushing (16) includes a cylindrical insertion part (17), the lower end of the cylindrical part (8) is inserted into the insertion part (17), the outer diameter of the insertion part (17) is the same as the inner diameter of the second hinge hole (20), and the lower end of the insertion part (17) is fixedly connected to a limiting part (18), the limiting part (18) is a plate-shaped structure, and the size of the limiting part (18) is larger than the outer diameter of the insertion part (17).

7. The loader frame articulated structure according to claim 6, characterized in that, The length of the insertion part (17) is the same as the depth of the second hinge hole (20).

8. The loader frame articulated structure according to claim 1, characterized in that, A third hinge hole (21) is provided on the rear frame (2). A bearing (5) is fixedly installed in the third hinge hole (21). The inner ring of the bearing (5) is fixedly connected to the cylindrical part (8).

9. The loader frame articulated structure according to claim 1, characterized in that, The hinge assembly (3) is provided in two sets, and the two sets of hinge assemblies (3) are arranged opposite each other.

10. The loader frame articulated structure according to claim 1, characterized in that, The minimum diameter of the truncated cone portion (9) is not less than that of the cylindrical portion (8).

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