Main frame and auxiliary frame connecting assembly and main frame and auxiliary frame connecting structure

Abstract

The utility model discloses a main and auxiliary frame connecting assembly and a main and auxiliary frame connecting structure, and belongs to the technical field of dumper parts. The main and auxiliary frame connecting assembly comprises an upper tensioning frame and a lower tensioning frame, the upper tensioning frame is used for being connected with an auxiliary frame longitudinal beam, the lower tensioning frame is used for being connected with a main frame longitudinal beam, the upper tensioning frame and the lower tensioning frame are connected through a second bolt pair, and a base plate is arranged between the upper tensioning frame and the lower tensioning frame. A gap between the upper tensioning frame and the lower tensioning frame can be eliminated through the base plate, the anti-loosening effect is achieved, the precision requirement for installation and positioning of the upper tensioning frame and the lower tensioning frame is lowered, the second bolt pair is sleeved with the sleeve, the sleeve is located between the head of a bolt of the second bolt pair and the upper tensioning frame, the threaded section of the bolt is only used for being connected with the lower tensioning frame, and therefore the anti-loosening effect is achieved. And the bolt bar in the area where the sleeve is located only bears axial force, so that the stress efficiency and reliability of the bolt are improved, and the bolt is not easy to break when being lengthened.

Description

Technical Field

[0001] This utility model relates to the technical field of dump truck parts, and in particular to a main and sub-frame connection assembly and a main and sub-frame connection structure. Background Technology

[0002] Dump trucks consist of a chassis, cargo box, and hydraulic lifting system. The chassis and cargo box are connected and fixed by a subframe. Due to the harsh working conditions and complex stress process of dump trucks, the subframe must be restricted in the vertical and horizontal directions during the connection with the longitudinal beams of the main frame. The subframe and the longitudinal beams of the main frame are generally fixed and limited by U-bolts and thrust plates.

[0003] However, the connection parts of the U-bolt and thrust plate structure are prone to loosening. In order to solve the loosening problem, a connection structure for connecting the main and sub-frames of dump trucks has been developed. The connection structure includes an upper connector and a lower connector. The upper connector is fixedly connected to the sub-frame by welding, and the lower connector is fixedly connected to the longitudinal beam of the main frame by bolts. The upper connector and the lower connector are also fixedly connected by bolts to improve the connection firmness.

[0004] In the aforementioned connection structure, the upper and lower connectors are only connected by bolts. This requires high precision in the installation and positioning of the upper and lower connectors. Gaps are very likely to exist between the upper and lower connectors, necessitating the lengthening of the bolts between them to accommodate the gaps and increase the preload. However, the presence of gaps can easily lead to loosening, and the extended bolts are also prone to breakage under stress. Furthermore, the way the upper and lower connectors fit only against the corresponding subframe and main frame longitudinal beams means that the lateral restraint of the subframe mainly relies on the bolts between the upper and lower connectors, which are extremely susceptible to damage under stress. Utility Model Content

[0005] To address the technical problems in the existing main and subframe connection structures of dump trucks mentioned above, where the upper and lower connecting parts are only connected by bolts, requiring high installation and positioning accuracy of the upper and lower connecting parts, and gaps are easily formed between the upper and lower connecting parts, it is necessary to lengthen the bolts between the upper and lower connecting parts. This not only makes them prone to loosening, but the lengthened bolts are also prone to breakage under stress. Therefore, this utility model provides a main and subframe connection assembly.

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

[0007] This utility model provides a main and subframe connection assembly, including an upper tensioning bracket and a lower tensioning bracket. The upper tensioning bracket is used to connect with the subframe longitudinal beam, and the lower tensioning bracket is used to connect with the main frame longitudinal beam. The upper and lower tensioning brackets are connected by a second bolt assembly. A shim is provided between the upper and lower tensioning brackets to eliminate the gap between them, thus preventing loosening and reducing the accuracy requirements for the installation and positioning of the upper and lower tensioning brackets. A sleeve is fitted on the second bolt assembly, located between the bolt head and the upper tensioning bracket. This ensures that the threaded section of the bolt is only used to connect the lower tensioning bracket, while the bolt shank in the sleeve area only bears axial force, improving the bolt's stress efficiency and reliability and ensuring that the bolt is not easily broken when extended.

[0008] Preferably, the upper tensioning frame is detachably connected to the web of the subframe longitudinal beam via the first bolt pair, and the lower tensioning frame is detachably connected to the web of the main frame longitudinal beam via the first bolt pair. No welding operation is required, which effectively avoids the problem of paint damage caused by welding. No touch-up painting is required, ensuring the uniformity of paint color and the aesthetic appearance of the frame.

[0009] Preferably, both the upper tensioner and the lower tensioner are L-shaped structures, which simplifies the structure and facilitates the installation of the first bolt pair and the second bolt pair.

[0010] Preferably, both the upper tensioning bracket and the lower tensioning bracket include a vertical section and a horizontal section. The vertical section is provided with several first mounting holes, and the horizontal section is provided with several second mounting holes, which facilitates the installation of bolt pairs and reduces the need for on-site drilling.

[0011] Preferably, the first bolt pair is connected to the first mounting hole, and the second bolt pair is connected to the second mounting hole, so as to connect the upper and lower tensioning frames and the upper and lower tensioning frames to the corresponding longitudinal beams by using the first bolt pair and the second bolt pair respectively.

[0012] Preferably, the vertical and horizontal sections are fixedly connected by reinforced side plates to improve the overall strength and stability of the upper and lower tensioning frames.

[0013] Preferably, the height of the upper end of the vertical section of the lower tensioner is higher than that of the main frame longitudinal beam. The vertical section of the lower tensioner is in contact with the web of the main frame longitudinal beam and the sub-frame longitudinal beam. This can assist the second bolt pair in limiting the left and right movement of the sub-frame longitudinal beam, improving the left and right limiting effect while reducing the stress on the second bolt pair and increasing its service life.

[0014] Preferably, the second bolt pair passes through the upper tensioning bracket, the pad, and the lower tensioning bracket in sequence to ensure the firmness of the connection between the upper tensioning bracket, the lower tensioning bracket, and the pad.

[0015] Preferably, at least one pad is provided to meet the filling requirements of different gap sizes between the upper tensioning frame and the lower tensioning frame.

[0016] This utility model provides a main and sub-frame connection structure, including a main frame longitudinal beam and a sub-frame longitudinal beam. Both sides of the main frame longitudinal beam are fixedly connected to the sub-frame longitudinal beam through a main and sub-frame connection assembly, so as to connect the main frame longitudinal beam and the sub-frame longitudinal beam by means of the main and sub-frame connection assembly, thereby restricting the vertical and horizontal directions of the sub-frame longitudinal beam.

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

[0018] 1. A shim is provided between the upper and lower tensioning brackets. The shim can be used to eliminate the gap between the upper and lower tensioning brackets, which can prevent loosening and reduce the accuracy requirements for the installation and positioning of the upper and lower tensioning brackets. A sleeve is fitted on the second bolt assembly. The sleeve is located between the bolt head of the second bolt assembly and the upper tensioning bracket. This allows the threaded section of the bolt to be used only to connect the lower tensioning bracket, while the bolt shank in the area where the sleeve is located only bears the axial force, which improves the stress efficiency and reliability of the bolt and ensures that the bolt is not easy to break when it is lengthened.

[0019] 2. The height of the upper end of the vertical section of the lower tensioner is higher than that of the main frame longitudinal beam. The vertical section of the lower tensioner fits in close contact with the web of the main frame longitudinal beam and the sub-frame longitudinal beam. This can assist the second bolt pair in limiting the left and right movement of the sub-frame longitudinal beam, improving the left and right limiting effect while reducing the stress on the second bolt pair and increasing its service life. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a front view structural diagram of the main and subframe connection assembly of this utility model in use according to one or more embodiments;

[0022] Figure 2 This is a side view of the main and subframe connection assembly of the present invention in use according to one or more embodiments;

[0023] Figure 3 This is a front view structural diagram of the tensioning frame according to one or more embodiments of the present invention;

[0024] Figure 4 This is a top view of the tensioning frame according to one or more embodiments of the present invention;

[0025] Figure 5 This is a side view of the tensioning frame according to one or more embodiments of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the pad 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. Upper tensioning bracket; 2. Lower tensioning bracket; 3. First bolt pair; 4. Second bolt pair; 5. Washer plate; 6. Sleeve; 7. Vertical section; 8. Horizontal section; 9. Reinforcing side plate; 10. First mounting hole; 11. Second mounting hole; 12. Main frame longitudinal beam; 13. Subframe longitudinal beam; 14. Third mounting hole. 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 1-6 As shown, a main and subframe connection assembly is proposed, including: a tensioning frame arranged vertically, a first bolt pair 3, a second bolt pair 4, a pad 5, and a sleeve 6. The tensioning frame is divided into an upper tensioning frame 1 and a lower tensioning frame 2. The upper tensioning frame 1 is used to connect with the subframe longitudinal beam 14, and the lower tensioning frame 2 is used to connect with the main frame longitudinal beam 12. Specifically, the upper tensioning frame 1 is detachably connected to the web of the subframe longitudinal beam 14 through the first bolt pair 3, and the lower tensioning frame 2 is detachably connected to the web of the main frame longitudinal beam 12 through the first bolt pair 3. The upper tensioning frame 1 and the lower tensioning frame 2 are detachably connected to each other through the second bolt pair 4.

[0032] Both the first bolt assembly 3 and the second bolt assembly 4 include a bolt and a nut, with the bolt and nut threaded together. At least one washer 5 is provided, and the washer 5 is placed between the upper tensioning bracket 1 and the lower tensioning bracket 2. The second bolt assembly 4 passes through the upper tensioning bracket 1, the washer 5 and the lower tensioning bracket 2 in sequence. The washer 5 can be used to eliminate the gap between the upper tensioning bracket 1 and the lower tensioning bracket 2, thereby preventing loosening and reducing the accuracy requirements for the installation and positioning of the upper tensioning bracket 1 and the lower tensioning bracket 2.

[0033] In this embodiment, the upper tensioning frame 1 and the lower tensioning frame 2 are respectively connected to the corresponding subframe longitudinal beam 13 and main frame longitudinal beam 12 through the first bolt pair 3. No welding operation is required, which effectively avoids the problem of paint damage caused by welding. No touch-up painting is required, ensuring the uniformity of paint color and the aesthetic appearance of the frame.

[0034] The sleeve 6 is fitted onto the second bolt assembly 4, and the sleeve 6 is located between the bolt head of the second bolt assembly 4 and the upper tensioning bracket 1. Specifically, the sleeve 6 is fitted onto the threaded section of the bolt shank of the second bolt assembly 4 above the upper tensioning bracket 1. The bolt head of the second bolt assembly 4 applies downward pressure to the upper tensioning bracket 1 through the sleeve 6, and applies upward tension to the lower tensioning bracket 2 in conjunction with the bolt. By increasing the length of the bolt, the preload is increased to achieve a firm connection between the upper tensioning bracket 1 and the lower tensioning bracket 2. The sleeve 6 can fill the "idle length" of the bolt shank, so that the threaded section of the bolt is only used to connect the lower tensioning bracket 2, while the bolt shank in the area where the sleeve 6 is located only bears the axial force, improving the stress efficiency and reliability of the bolt and ensuring that the bolt is not easy to break when it is lengthened.

[0035] Both the upper tensioner 1 and the lower tensioner 2 are L-shaped structures, and their structures are identical, as detailed below. Figure 3 , Figure 4 and Figure 5 As shown, both the upper tensioning frame 1 and the lower tensioning frame 2 include a vertical section 7, a horizontal section 8 and a reinforcing side plate 9. The vertical section 7, the horizontal section 8 and the reinforcing side plate 9 are fixedly connected. The vertical section 7 and the horizontal section 8 are perpendicular to each other. The two are fixedly connected to form an L-shaped structure. There are two reinforcing side plates 9. The two sides of the vertical section 7 and the horizontal section 8 are fixedly connected together through the reinforcing side plates 9.

[0036] In this embodiment, the vertical section 7, the horizontal section 8, and the reinforcing side plate 9 are integrally formed, which reduces welding operations, reduces deformation problems caused by welding, and ensures the aesthetic appearance of the upper tensioning frame 1 and the lower tensioning frame 2.

[0037] The vertical section 7 is used to fit against the web of the longitudinal beam, and several first mounting holes 10 are provided on the vertical section 7 for the installation of the first bolt pair 3; the horizontal section 8 is used to fit against the pad 5, and several second mounting holes 11 are provided on the horizontal section 8 for the installation of the second bolt pair 4; such as Figure 6 As shown, the pad 5 is provided with a number of third mounting holes 14. The number of third mounting holes 14 is the same as the number of second mounting holes 11 and they correspond one-to-one, so as to be used for the installation of the second bolt pair 4.

[0038] In this embodiment, the vertical section 7 of the upper tensioning frame 1 is used to connect and fit with the web of the subframe longitudinal beam 13; the vertical section 7 of the lower tensioning frame 2 is used to connect with the web of the main frame longitudinal beam 12, and the upper end of the vertical section 7 of the lower tensioning frame 2 is higher than the main frame longitudinal beam 12, so that the vertical section 7 of the lower tensioning frame 2 can fit with the web of both the main frame longitudinal beam 12 and the subframe longitudinal beam 13 at the same time, thereby assisting the second bolt assembly 4 in limiting the subframe longitudinal beam 13 to the left and right, improving the left and right limiting effect, reducing the stress on the second bolt assembly 4, and improving the service life of the second bolt assembly 4.

[0039] Understandably, in practical use, a drilling rig can be used to drill holes in the main frame longitudinal beam 12 and the subframe longitudinal beam 13 for the installation of the first bolt assembly 3, and a fixed torque wrench can be used to tighten the first bolt assembly 3 to ensure that there is no gap between the vertical section 7 and the corresponding longitudinal beam web, thus ensuring the fixity and stability of the connection; thread-locking adhesive can also be applied to the bolts to improve the resistance to torque attenuation.

[0040] Example 2

[0041] In another typical embodiment of this utility model, a main and sub-frame connection structure is proposed, including: a main frame longitudinal beam 12, a sub-frame longitudinal beam 13, and a main and sub-frame connection assembly. Both sides of the main frame longitudinal beam 12 are fixedly connected to the sub-frame longitudinal beam 13 through the main and sub-frame connection assembly, thereby restricting the movement of the sub-frame longitudinal beam 13 in the vertical and horizontal directions.

[0042] It should be noted that the two sides of the main frame longitudinal beam 12 mentioned in this embodiment specifically refer to the left and right longitudinal beams of the frame, that is, the outermost longitudinal beams of the frame. Therefore, there is no need to process and install on the inside of the frame, which effectively reduces the installation difficulty.

[0043] Specifically, the main and subframe connection assembly includes an upper tensioning frame 1 and a lower tensioning frame 2. The upper tensioning frame 1 and the lower tensioning frame 2 are connected by a second bolt pair 4. The upper tensioning frame 1 is mounted on the web of the subframe longitudinal beam 13 by a first bolt pair 3. The vertical section 7 of the upper tensioning frame 1 is connected to and fits against the web of the subframe longitudinal beam 13.

[0044] The lower tensioner 2 is installed on the web of the main frame longitudinal beam 12 via the first bolt pair 3. The upper end of the vertical section 7 of the lower tensioner 2 is higher than the main frame longitudinal beam 12, so that the vertical section 7 of the lower tensioner 2 is in contact with the web of both the main frame longitudinal beam 12 and the sub-frame longitudinal beam 13. This assists the second bolt pair 4 in limiting the sub-frame longitudinal beam 13 to the left and right, improving the left and right limiting effect while reducing the stress on the second bolt pair 4 and increasing its service life.

[0045] At least one pad 5 is provided between the horizontal section 8 of the upper tensioning bracket 1 and the horizontal section 8 of the lower tensioning bracket 2. The second bolt pair 4 passes through the upper tensioning bracket 1, the pad 5 and the lower tensioning bracket 2 in sequence. The pad 5 can be used to eliminate the gap between the upper tensioning bracket 1 and the lower tensioning bracket 2, so as to prevent loosening and reduce the accuracy requirements for the installation and positioning of the upper tensioning bracket 1 and the lower tensioning bracket 2.

[0046] 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 main and subframe connection assembly, comprising: The upper tensioning frame (1) and the lower tensioning frame (2) are used to connect with the subframe longitudinal beam (13) and the lower tensioning frame (2) are used to connect with the main frame longitudinal beam (12). The upper tensioning frame (1) and the lower tensioning frame (2) are connected by a second bolt pair (4). The upper tensioning frame (1) and the lower tensioning frame (2) are characterized by a pad (5) between the upper tensioning frame (1) and the lower tensioning frame (2), and a sleeve (6) is fitted on the second bolt pair (4). The sleeve (6) is located between the bolt head of the second bolt pair (4) and the upper tensioning frame (1).

2. The main and subframe connection assembly according to claim 1, characterized in that, The upper tensioning frame (1) is detachably connected to the web of the subframe longitudinal beam (13) via the first bolt pair (3), and the lower tensioning frame (2) is detachably connected to the web of the main frame longitudinal beam (12) via the first bolt pair (3).

3. The main and subframe connection assembly according to claim 2, characterized in that, Both the upper tensioning bracket (1) and the lower tensioning bracket (2) are L-shaped structures.

4. The main and subframe connection assembly according to claim 3, characterized in that, The upper tensioning bracket (1) and the lower tensioning bracket (2) both include a vertical section (7) and a horizontal section (8). The vertical section (7) is provided with a number of first mounting holes (10), and the horizontal section (8) is provided with a number of second mounting holes (11).

5. The main and subframe connection assembly according to claim 4, characterized in that, The first bolt pair (3) is connected to the first mounting hole (10), and the second bolt pair (4) is connected to the second mounting hole (11).

6. The main and subframe connection assembly according to claim 4, characterized in that, The vertical section (7) and the horizontal section (8) are fixedly connected on both sides by reinforcing side plates (9).

7. The main and subframe connection assembly according to claim 4, characterized in that, The height of the upper end of the vertical section (7) of the lower tension frame (2) is higher than that of the main frame longitudinal beam (12). The vertical section (7) of the lower tension frame (2) is in contact with the web of the main frame longitudinal beam (12) and the sub-frame longitudinal beam (13).

8. The main and subframe connection assembly according to claim 1, characterized in that, The second bolt assembly (4) passes through the upper tensioning bracket (1), the pad (5), and the lower tensioning bracket (2) in sequence.

9. The main and subframe connection assembly according to claim 1, characterized in that, At least one pad (5) shall be provided.

10. A main and subframe connection structure, characterized in that, include: The main frame longitudinal beam (12) and the sub-frame longitudinal beam (13) are fixedly connected on both sides of the main frame longitudinal beam (12) to the sub-frame longitudinal beam (13) by the main and sub-frame connecting assembly as described in any one of claims 1-9.

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