Frame assembly of two-axle unmanned transport vehicle

Abstract

The invention discloses a frame assembly of a two-axle unmanned transport vehicle. The frame assembly comprises a main frame and an auxiliary frame. The auxiliary frame is arranged on one side of the main frame in the height direction of the main frame; the two ends of the main frame in the length direction are each provided with at least one auxiliary frame. The bearing capacity of the frame assembly can be improved, and the frame assembly is suitable for the heavy unmanned transport vehicle.

Description

Technical Field

[0001] The invention relates to the field of unmanned transport vehicles, in particular to a frame assembly of a two-axle unmanned transport vehicle. Background Art

[0002] The existing large transport vehicles have a light-loaded front cab and a heavy-loaded rear cab with a double-layer frame, which is quite different from the entire operating conditions and usage scenarios of unmanned transport vehicles. In addition, the main frame of the existing large transport vehicles needs to bear the point concentrated load brought by the upper saddle, so the sub-frame at the rear of the transport vehicle falls on the side of the main frame to strengthen the main frame and play a bending resistance role.

[0003] However, the subframe of this type of frame structure generally uses short beams, which mainly play an auxiliary strengthening role and are not directly stressed. In addition, since the subframe is installed on the side of the main frame, it can only disperse the stress in the vertical direction of the main frame, which reduces the load-bearing capacity of the frame. Unmanned transport vehicles have higher requirements on the load-bearing capacity of the frame because they need to carry hydrogen tanks, control cabinets, high-voltage cabinets and other structures, and the frame assembly of existing large transport vehicles cannot meet the needs of unmanned transport vehicles. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a frame assembly of a two-axle unmanned transport vehicle to improve the load-bearing capacity of the frame.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A frame assembly of a two-axle unmanned transport vehicle comprises a main frame and a sub-frame; in the height direction of the main frame, the sub-frame is installed on one side of the main frame; at least one sub-frame is respectively arranged at both ends of the main frame in the length direction.

[0006] Furthermore, the main frame includes at least two mutually parallel main longitudinal beams and at least three main cross beams; the main cross beam is arranged between two of the oppositely arranged main longitudinal beams and is perpendicular to the main longitudinal beams.

[0007] Furthermore, the main longitudinal beam includes a horizontal plate and a vertical plate; in the height direction of the main frame, a horizontal plate is respectively provided at both ends of the vertical plate, and the horizontal plate and the vertical plate are perpendicular to each other; the connection between the horizontal plate and the vertical plate is connected by a smooth transition of an arc surface.

[0008] Furthermore, the main longitudinal beam includes a first beam body and a second beam body that are embedded in each other; in the height direction of the main frame, the first beam body and the second beam body are arranged opposite to each other; a clamping groove is provided on the side of the first beam body close to the second beam body, the second beam body is embedded in the clamping groove, and the first beam body and the second beam body are riveted.

[0009] Furthermore, the engaging groove comprises a first limiting surface and a second limiting surface; an acute angle is formed between the first limiting surface and the second limiting surface; and the first limiting surface and the second limiting surface are connected by a smooth transition of an arc surface.

[0010] Furthermore, in the length direction of the main frame, a side of the sub-frame facing the other sub-frame has an arc-shaped clearance groove.

[0011] Furthermore, there is a spacing between the sub-frames located at both ends of the same main frame, and the ratio of the spacing to the length of the main frame is 0.2-0.5.

[0012] Furthermore, the main frame is connected to each of the sub-frames via an even number of first connecting assemblies and second connecting assemblies, respectively.

[0013] Furthermore, the main frame is connected to each of the sub-frames via at least four diagonally arranged second connecting assemblies.

[0014] Furthermore, the second connecting assembly includes a second connecting member and an extension frame; the extension frame is connected to the second connecting member and extends in a direction away from the main frame.

[0015] The beneficial effect of the present invention is that the torsion and bending resistance of the frame assembly is greatly improved by adding a sub-frame in the height direction of the main frame, so that the hydrogen tank, control cabinet, battery, etc. can be integrated on the frame to ensure the carrying capacity of the unmanned transport vehicle. In addition, since the sub-frames are respectively provided at both ends of the length direction of the main frame, the carrying capacity of the front and rear parts of the frame assembly is balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structural diagram of the frame assembly of the present invention is Figure 2 for Figure 1 Side view of Figure 3 for Figure 1 A magnified view of part A; Figure 4 for Figure 1 A magnified view of part B; Figure 5 Figure 1 Enlarged view of part C; Figure 6 for Figure 1 A front view of Figure 7 for Figure 1 A top view of Figure 8It is a schematic diagram of the local structure of the secondary crossbeam in the present invention; Fig. 9 for Figure 8 The curvature design data diagram of the arc surface at A in the middle; Fig.10 for Figure 8 The curvature design data diagram of the arc surface at B in the middle; Fig.11 for Figure 8 The curvature design data diagram of the arc surface at C in the middle; Fig.12 for Figure 8 The curvature design data diagram of the arc surface at D in the middle; Fig.13 for Figure 8 Curvature design data diagram of the arc surface at E in the middle.

[0017] Description of labels: 1. Main frame; 11. Main longitudinal beam; 111. Horizontal plate; 112. Vertical plate; 113. First beam body; 1131. Limiting portion; 114. Second beam body; 115. Engaging groove; 1151. First limiting surface; 1152. Second limiting surface; 12. Main cross beam; 121. Main cross beam body; 122. First reinforcement; 1221. First extension portion; 123. Second reinforcement; 1231. Second extension portion; 2. Subframe; 21. Arc-shaped clearance groove; 22. Sub-longitudinal beam; 23. Sub-cross beam; 3. A first connection component; 4. Second connecting assembly; 41. Second connecting member; 42. Extension frame. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0019] Please refer to Figure 1-Figure 7 A frame assembly of a two-bridge unmanned transport vehicle includes a main frame 1 and a sub-frame 2; the sub-frame 2 is installed on one side of the main frame 1 in the height direction of the main frame 1; at least one sub-frame 2 is respectively provided at both ends of the main frame 1 in the length direction. The main frame 1 and the sub-frame 2 are connected by riveting.

[0020] It can be understood that the invention significantly improves the torsion and bending resistance of the frame assembly by adding a subframe 2 in the height direction of the main frame 1, thereby enabling the hydrogen tank, control cabinet, battery, etc. to be integrated on the frame to ensure the carrying capacity of the unmanned transport vehicle. In addition, since the subframes 2 are respectively provided at both ends of the length direction of the main frame 1, the carrying capacity of the front and rear parts of the frame assembly is balanced.

[0021] In some embodiments, the main frame 1 includes at least two mutually parallel main longitudinal beams 11 and at least three main cross beams 12; the main cross beam 12 is arranged between two of the oppositely arranged main longitudinal beams 11 and is perpendicular to the main longitudinal beams 11. When the length of the main frame 1 is 14m~15m, about eight main cross beams 12 should be arranged. The more the number of main cross beams 12 is, the stronger the bearing capacity of the main frame 1 is. Specifically, the main cross beam 12 includes a main cross beam body 121 and a first reinforcement 122, and a first reinforcement 122 is respectively arranged at both ends of the main cross beam body 121 in the length direction, and the first reinforcement 122 is embedded in the main longitudinal beam 11; the main cross beam 12 located at the end of the main longitudinal beam 11 also includes a second reinforcement 123, and a first reinforcement 122 is respectively arranged at both ends of the main cross beam body 121 in the length direction, and the first reinforcement 122 is embedded in the second reinforcement 123 and connected to the main longitudinal beam 11 through the second reinforcement 123. Furthermore, in the length direction of the main longitudinal beam 11, the length of the second reinforcement 123 should be greater than the length of the first reinforcement 122. The arrangement of the first reinforcement 122 and the second reinforcement 123 plays a reinforcing role in the height direction and the length direction of the main frame 1, and improves the bearing capacity of the main longitudinal beam 11. The cross-sections of the first reinforcement 122 and the second reinforcement 123 are both concave, and the first reinforcement 122 has a first extension portion 1221 extending along the middle of the main cross beam body 121, and the second reinforcement 123 has a second extension portion 1231 extending along the middle of the main cross beam body 121. The arrangement of the first extension portion 1221 and the second extension portion 1231 is used to improve the bearing capacity and bending resistance of the main cross beam 12 in the vertical direction.

[0022] In some embodiments, the main longitudinal beam 11 includes a horizontal plate 111 and a vertical plate 112; in the height direction of the main frame 1, a horizontal plate 111 is respectively provided at both ends of the vertical plate 112, and the horizontal plate 111 and the vertical plate 112 are perpendicular to each other; the connection between the horizontal plate 111 and the vertical plate 112 is connected by a smooth transition of an arc surface. The vertical plate 112 is used to improve the bending and torsion resistance of the horizontal plate 111, thereby making the main longitudinal beam 11 have a good load-bearing capacity. Among them, the horizontal plate 111 and the vertical plate 112 are connected by an arc surface transition, which can reduce the local stress caused by pressure in a single direction. Specifically, the curvature of the arc surface is obtained by a proprietary curvature design, so that the overall bending resistance of the main longitudinal beam 11 is improved, and stress concentration can be avoided to increase the fatigue degree of the main longitudinal beam 11. The curvature design is as follows: refer to Figure 8 , the curvature of the arc surface at A changes continuously (refer to the change rule Fig. 9 ), the maximum value is 0.51mm^-1; the curvature of the arc surface at B changes continuously (refer to the change rule Fig.10 ), the maximum value is 0.1mm^-1; the curvature of the arc surface at C changes continuously (refer to the change rule Fig.11 ), the maximum value is 0.09mm^-1; the curvature of the arc surface at D changes continuously (refer to the change law Fig.12 ), the maximum value is 0.09mm^-1; the curvature of the arc surface at E changes continuously (refer to the change law Fig.13 ), the maximum value is 0.09mm^-1.

[0023] In some embodiments, the main longitudinal beam 11 includes a first beam body 113 and a second beam body 114 that are interlocked with each other; in the height direction of the main frame 1, the first beam body 113 and the second beam body 114 are arranged opposite to each other; a snap-fit ​​groove 115 is arranged on one side of the first beam body 113 close to the second beam body 114, the second beam body 114 is embedded in the snap-fit ​​groove 115, and the first beam body 113 is riveted to the second beam body 11. Specifically, the first beam body 113 and the second beam body 114 both include a horizontal plate 111 and a vertical plate 112, wherein the vertical plate 112 of the first beam body 113 is further provided with a limiting portion 1131, the limiting portion 1131 and the vertical plate 112 form a snap-fit ​​groove 115, and when the first beam body 113 and the second beam body 114 are interlocked, the limiting portion 1131 and the vertical plate 112 of the second beam body 114 abut against each other. In addition, the first beam body 113 and the second beam body 114 are riveted, and the first beam body 113 and the second beam body 114 are riveted to the second reinforcement member 123 at the same time.

[0024] In some embodiments, the engaging groove 115 includes a first limiting surface 1151 and a second limiting surface 1152; an acute angle is formed between the first limiting surface 1151 and the second limiting surface 1152; the first limiting surface 1151 and the second limiting surface 1152 are connected by a smooth transition of an arc surface. Similarly, the arc surface is designed to disperse stress to avoid stress concentration and fatigue of the main longitudinal beam 11.

[0025] In some embodiments, in the length direction of the main frame 1, the side of the sub-frame 2 facing the other sub-frame 2 has an arc-shaped clearance groove 21. The arc-shaped clearance groove 21 is provided to play a role in avoiding the wheels. Preferably, two sub-frames 2 are provided on the same main frame 1, and the two sub-frames 2 are symmetrically arranged with the central axis of the main frame 1 as the symmetry center. Correspondingly, the opposite ends of the two sub-frames 2 each have an arc-shaped clearance groove 21, and the slotting curvature of the two arc-shaped clearance grooves 21 adopts a double parabola perpendicular intersection design to ensure that the residual strength of the frame assembly is maximized. The arc-shaped clearance groove 21 is composed of an arc and a straight line.

[0026] In some embodiments, the subframe 2 includes at least two mutually parallel sub-longitudinal beams 22 and at least two sub-cross beams 23. Specifically, the structure of the sub-cross beam 23 is the same as that of the main cross beam 12. The sub-longitudinal beam 22 is different from the main longitudinal beam 11 only in that an arc-shaped clearance groove 21 is provided at the end of the sub-longitudinal beam 22.

[0027] In some embodiments, there is a spacing between the sub-frames 2 located at both ends of the same main frame 1, and the ratio of the spacing to the length of the main frame 1 is 0.2-0.5. A certain spacing should be maintained between the two sub-frames 2 to provide space for the wheels. The larger the spacing, the larger the wheel size that can be accommodated, and vice versa. The wheel size is also related to the carrying capacity of the vehicle, so the spacing should not be too small, but also not too large. When the wheel size is too large, the required spacing is also larger, which will correspondingly shorten the length of the sub-frame 2, so that the carrying capacity of the frame assembly decreases accordingly. Therefore, as a preferred embodiment, the ratio of the spacing to the length of the main frame 1 is 0.33.

[0028] In some embodiments, the main frame 1 is connected to each sub-frame 2 through an even number of first connecting assemblies 3 and second connecting assemblies 4. Specifically, in the width direction of the main frame 1, the first connecting assemblies 3 and second connecting assemblies 4 located on both sides of the main frame 1 and the sub-frame 2 should be symmetrically arranged to ensure stress balance at the front and rear of the frame assembly. The first connecting assembly 3 is connected to the main frame 1 and the sub-frame 2 by riveting, and the part where the first connecting assembly 3 is riveted to the sub-frame 2 is provided with a collar, and no gasket is provided at the collar to reduce stress concentration.

[0029] In some embodiments, the main frame 1 is connected to each sub-frame 2 via at least four diagonally arranged second connection assemblies 4 to ensure stress balance at the front and rear of the frame assembly and improve the reliability of the transport vehicle.

[0030] In some embodiments, the second connection assembly 4 includes a second connection member 41 and an extension frame 42; the extension frame 42 is connected to the second connection member 41 and extends in a direction away from the main frame 1. The extension frame 42 is provided to connect with the functional module to realize the integration of the functional module and the frame assembly. Specifically, the functional module includes a hydrogen tank, a high-voltage cabinet, a battery, a control cabinet, etc.

[0031] Embodiment 1 of the present invention is: A frame of a two-bridge unmanned transport vehicle comprises a main frame 1 and a sub-frame 2; the sub-frame 2 is mounted on one side of the main frame 1 in the height direction of the main frame 1; and a sub-frame 2 is respectively arranged at both ends in the length direction of the main frame 1. The main frame 1 and the sub-frame 2 are connected by riveting.

[0032] In this embodiment, the main frame 1 includes two parallel main longitudinal beams 11 and eight main cross beams 12; the main cross beam 12 is arranged between two oppositely arranged main longitudinal beams 11 and is perpendicular to the main longitudinal beams 11. Specifically, the main cross beam 12 includes a main cross beam body 121 and a first reinforcement 122, and a first reinforcement 122 is respectively arranged at both ends of the main cross beam body 121 in the length direction, and the first reinforcement 122 is embedded in the main longitudinal beam 11; the main cross beam 12 located at the end of the main longitudinal beam 11 also includes a second reinforcement 123, and a first reinforcement 122 is respectively arranged at both ends of the main cross beam body 121 in the length direction, and the first reinforcement 122 is embedded in the second reinforcement 123 and connected to the main longitudinal beam 11 through the second reinforcement 123. Further, in the length direction of the main longitudinal beam 11, the length of the second reinforcement 123 should be greater than the length of the first reinforcement 122. The cross sections of the first reinforcement 122 and the second reinforcement 123 are both concave, and the first reinforcement 122 has a first extension portion 1221 extending along the middle of the main beam body 121, and the second reinforcement 123 has a second extension portion 1231 extending along the middle of the main beam body 121, the first extension portion 1221 presses against the main beam body 121, and the second extension portion 1231 presses against the first extension portion 1221. Preferably, all the main beams 12 are symmetrically distributed with the central axis of the main frame 1 as the symmetry center.

[0033] In this embodiment, the main longitudinal beam 11 includes a horizontal plate 111 and a vertical plate 112; in the height direction of the main frame 1, a horizontal plate 111 is respectively provided at both ends of the vertical plate 112, and the horizontal plate 111 and the vertical plate 112 are perpendicular to each other; the connection between the horizontal plate 111 and the vertical plate 112 is connected by a smooth arc transition.

[0034] In this embodiment, the main longitudinal beam 11 includes a first beam body 113 and a second beam body 114 that are interlocked with each other; in the height direction of the main frame 1, the first beam body 113 and the second beam body 114 are arranged opposite to each other; a snap-fitting groove 115 is arranged on one side of the first beam body 113 close to the second beam body 114, the second beam body 114 is embedded in the snap-fitting groove 115, and the first beam body 113 and the second beam body 114 are riveted. Specifically, the first beam body 113 and the second beam body 114 both include a horizontal plate 111 and a vertical plate 112, wherein the vertical plate 112 of the first beam body 113 is further provided with a limiting portion 1131, the limiting portion 1131 and the vertical plate 112 form a snap-fitting groove 115, and when the first beam body 113 and the second beam body 114 are interlocked, the limiting portion 1131 and the vertical plate 112 of the second beam body 114 abut against each other. The first beam body 113 and the second beam body 114 are riveted together, and the first beam body 113 and the second beam body 114 are riveted together with the second reinforcement member 123 at the same time.

[0035] In this embodiment, the engaging groove 115 includes a first limiting surface 1151 and a second limiting surface 1152 ; an acute angle is formed between the first limiting surface 1151 and the second limiting surface 1152 ; the first limiting surface 1151 and the second limiting surface 1152 are connected by a smooth transition of an arc surface.

[0036] In this embodiment, in the length direction of the main frame 1, the side of the sub-frame 2 facing the other sub-frame 2 has an arc-shaped clearance groove 21. Two sub-frames 2 are arranged on the same main frame 1, and the two sub-frames 2 are symmetrically arranged with the central axis of the main frame 1 as the symmetry center. Correspondingly, the opposite ends of the two sub-frames 2 each have an arc-shaped clearance groove 21.

[0037] In this embodiment, the subframe 2 includes two sub-longitudinal beams 22 and two sub-cross beams 23 which are parallel to each other.

[0038] In this embodiment, there is a spacing between the two sub-frames 2, and the ratio of the spacing to the length of the main frame 1 is 0.33.

[0039] In this embodiment, the main frame 1 is connected to each sub-frame 2 through two first connection components 3 and two second connection components 4. Specifically, in the width direction of the main frame 1, the two first connection components 3 and the two second connection components 4 located on both sides of the main frame 1 and the sub-frame 2 should be symmetrically arranged.

[0040] In this embodiment, the main frame 1 is connected to each auxiliary frame 2 via four diagonally arranged second connecting assemblies 4 .

[0041] In this embodiment, the second connecting assembly 4 includes a second connecting member 41 and an extending frame 42 ; the extending frame 42 is connected to the second connecting member 41 and extends in a direction away from the main frame 1 .

[0042] In summary, the present invention provides a frame assembly for a two-axle unmanned transport vehicle. Due to the double-layer frame structure formed by the main frame and the auxiliary frame, the load-bearing capacity of the frame assembly is improved, and all the bends on the longitudinal beam and the cross beam are connected by arc transition, so that the stress can be dispersed, avoiding fatigue of the frame assembly, which can not only improve the load-bearing capacity but also extend the service life. Due to the improved load-bearing capacity of the frame assembly, the functional module can be integrated into the frame assembly, realizing the automatic driving of the unmanned transport vehicle, and making the unmanned transport vehicle have good load-bearing capacity.

[0043] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A frame assembly of a two-axle unmanned transport vehicle, characterized in that: Including main frame and subframe; The sub-frame is installed on one side of the main frame in the height direction of the main frame; At least one sub-frame is respectively arranged at both ends of the main frame in the length direction.

2. The frame assembly of a two-axle unmanned transport vehicle according to claim 1, characterized in that: The main frame includes at least two mutually parallel main longitudinal beams and at least three main cross beams; The main cross beam is arranged between two oppositely arranged main longitudinal beams and is perpendicular to the main longitudinal beams.

3. The frame assembly of a two-axle unmanned transport vehicle according to claim 2, characterized in that: The main longitudinal beam includes a horizontal plate and a vertical plate; In the height direction of the main frame, two ends of the vertical plate are respectively provided with a horizontal plate, and the horizontal plate and the vertical plate are perpendicular to each other; The connection between the horizontal plate and the vertical plate is connected by a smooth transition of an arc surface.

4. The frame assembly of a two-axle unmanned transport vehicle according to claim 1, characterized in that: The main longitudinal beam comprises a first beam body and a second beam body which are interlocked with each other; In the height direction of the main frame, the first beam body and the second beam body are arranged opposite to each other; A clamping groove is arranged on one side of the first beam body close to the second beam body, the second beam body is embedded in the clamping groove, and the first beam body and the second beam body are riveted.

5. The frame assembly of a two-axle unmanned transport vehicle according to claim 4, characterized in that: The engaging groove comprises a first limiting surface and a second limiting surface; An acute angle is formed between the first limiting surface and the second limiting surface; The first limiting surface and the second limiting surface are connected by a smooth transition of an arc surface.

6. The frame assembly of a two-axle unmanned transport vehicle according to claim 1, characterized in that: In the length direction of the main frame, one side of the sub-frame facing the other sub-frame has an arc-shaped clearance groove.

7. The frame assembly of a two-axle unmanned transport vehicle according to claim 1, characterized in that: There is a spacing between the sub-frames located at both ends of the same main frame, and the ratio of the spacing to the length of the main frame is 0.2-0.

5.

8. The frame assembly of a two-axle unmanned transport vehicle according to claim 1, characterized in that: The main frame is connected to each of the sub-frames through an even number of first connecting assemblies and second connecting assemblies.

9. The frame assembly of a two-axle unmanned transport vehicle according to claim 1, characterized in that: The main frame is connected to each of the sub-frames via at least four diagonally arranged second connecting assemblies.

10. The frame assembly of a two-axle unmanned transport vehicle according to claim 9, characterized in that: The second connecting assembly includes a second connecting member and an extension frame; The extension frame is connected to the second connecting member and is extended in a direction away from the main frame.

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