A tracked chassis

Abstract

The utility model relates to the technical field of chassis, concretely relates to a caterpillar track chassis, including two caterpillar tracks, being equipped with the transition beam between two caterpillar tracks, the length direction of transition beam is identical with the walking direction of caterpillar track, the telescopic oil cylinder one and telescopic oil cylinder two of cross inclination setting are equipped between each caterpillar track and transition beam, one end of telescopic oil cylinder one is hinged through hinging shaft no.

Description

Technical Field

[0001] This utility model relates to the field of chassis technology, specifically to a tracked chassis. Background Technology

[0002] In modern industry, construction, and municipal maintenance, aerial work platforms are becoming increasingly versatile as key equipment for performing high-altitude operations. To perform tasks in various scenarios, aerial work platforms sometimes have to move on irregular surfaces, such as fields, mountain slopes, or construction sites covered with gravel.

[0003] Currently, most aerial work platforms use wheeled chassis. Leveraging the point contact characteristics of tires with the ground, they can maneuver flexibly and move quickly on hardened surfaces such as concrete roads and level factory areas, offering significant advantages in operational efficiency. However, wheeled chassis have poor off-road capability, and their load-bearing stability depends on the flatness of the ground. To ensure operational safety, additional retractable outriggers are required for rigid support, and the deployment, leveling, and retraction of these outriggers take considerable time.

[0004] To address the issue of insufficient off-road capability, some aerial work platforms have adopted a tracked chassis design. This effectively handles complex terrains such as mud, gravel piles, and steep slopes, offering a significant improvement in off-road performance compared to wheeled chassis. However, tracked aerial work platforms typically require extension and retraction to change their travel width. This extension and retraction usually relies on the telescopic structures on both sides of the chassis. Each telescopic structure is hinged to both ends of the chassis and the traveling mechanism. However, in existing tracked chassis, each telescopic mechanism consists of a single telescopic arm, resulting in a relatively simple structure lacking stable geometric support. A single telescopic arm is highly susceptible to changes in deflection and load, making it prone to swaying and exhibiting poor stability. For example, patent CN214524124U discloses an adjustable chassis where the distance between the chassis and the traveling mechanism is changed by pushing and pulling a single telescopic arm on each side. This simple structure also lacks stable support. Utility Model Content

[0005] To address the technical problems of existing tracked chassis where each side's telescopic mechanism is a single telescopic arm, resulting in a simple structure, lack of stable geometric support, and significant swaying and poor stability due to the large influence of deflection and load changes on the single telescopic arm, this utility model provides a tracked chassis.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A tracked chassis includes two tracks, with a transition beam between them. The length direction of the transition beam is consistent with the walking direction of the tracks. Each track and the transition beam are provided with two telescopic cylinders, a first telescopic cylinder and a second telescopic cylinder, which are arranged in a cross-shaped and inclined manner. One end of the first telescopic cylinder is hinged to the track via a hinge shaft 1, and the other end of the first telescopic cylinder is hinged to the transition beam via a hinge shaft 2. One end of the second telescopic cylinder is hinged to the track via a hinge shaft 3, and the other end of the second telescopic cylinder is hinged to the transition beam via a hinge shaft 4. Each track and the transition beam are provided with a connecting rod. One end of the connecting rod is hinged to the track via a hinge shaft 1, and the other end of the connecting rod is hinged to the transition beam via a hinge shaft 4.

[0008] The above structural design uses two intersecting telescopic cylinders (first and second) and a connecting rod to form two opposing triangular structures. These two triangles together form a variable rectangular structure. The shape of this rectangle can be changed by extending and retracting the telescopic cylinders, allowing for flexible adjustment of the distance between the tracks and the transition beam. This enables the chassis to expand and contract, adapting to different operating scenarios. The triangles possess geometric stability, maintaining connection strength during the extension and retraction of the telescopic cylinders and preventing chassis swaying due to deflection or load changes, significantly improving the stability of the track-transition beam connection.

[0009] As a preferred implementation of a tracked chassis, one telescopic cylinder and two telescopic cylinders are provided between each track and the transition beam.

[0010] By adopting the above structural design and increasing the number of telescopic cylinders, the load can be distributed to multiple support points, reducing the stress load, lowering the risk of cylinder damage, and extending service life. The coordinated operation of multiple telescopic cylinders allows for more stable and accurate control of the chassis's expansion and contraction. Furthermore, if one telescopic cylinder malfunctions, another can still assist in operation, improving the reliability of the chassis.

[0011] As a preferred implementation of a tracked chassis, two tracks are symmetrically arranged on both sides of the transition beam.

[0012] By adopting the above structural design, the symmetrical structure ensures that the load is evenly distributed on both sides of the transition beam, avoiding the risk of tilting or overturning due to uneven weight distribution on one side when the chassis is deployed or retracted. Furthermore, it ensures that the forces on both tracks are consistent when deployed and retracted, reducing deviation caused by center of gravity shift and improving driving stability.

[0013] As a preferred implementation of a tracked chassis, the hinge shafts on both sides of the transition beam are symmetrically arranged about the transition beam, and the hinge shafts on both sides of the transition beam are symmetrically arranged about the transition beam.

[0014] By adopting the above structural design, it is ensured that the installation angles and force paths of the telescopic cylinders 1 and 2 on both sides are consistent when the chassis is extended or retracted, avoiding stress concentration on one side due to structural deviations. In addition, when the chassis is extended or retracted, the displacement and speed of the tracks on both sides are more synchronized, reducing skewing.

[0015] As a preferred implementation method for tracked chassis, the telescopic cylinders one and two on both sides of the transition beam are independently set.

[0016] With the above structural design, telescopic cylinder one and telescopic cylinder two can retract independently, allowing for individual adjustment of the distance between the track and the transition beam on one side, adapting to asymmetrical terrain and improving off-road capability.

[0017] As a preferred implementation of a tracked chassis, each track is provided with two connecting rods between it and the transition beam.

[0018] By adopting the above structural design, the number of connecting rods is increased to form two sets of connecting rods. These two sets of connecting rods share the tensile and thrust forces between the track and the transition beam, reducing the stress on individual connecting rods and preventing deformation or breakage due to overload, thus further enhancing structural stability. Furthermore, even if a single connecting rod fails, the other connecting rods can temporarily maintain the connection, reducing the risk of sudden failure and improving chassis safety.

[0019] As a preferred implementation of a tracked chassis, two connecting rods between each track and the transition beam are respectively located at both ends of the track's traveling direction.

[0020] By adopting the above structural design, it is possible to ensure that both the front and rear ends of the track are supported in the direction of travel when the chassis moves forward, backward, or uphill, thus avoiding excessive force on one end that could cause warping or swaying.

[0021] As a preferred implementation of a tracked chassis, the surface of the connecting rod is provided with an anti-corrosion coating.

[0022] By adopting the above structural design, the anti-corrosion coating can resist corrosion from outdoor humid and acidic / alkaline environments, extend the service life of the connecting rods, and reduce chassis maintenance costs.

[0023] As a preferred implementation of a tracked chassis, both telescopic cylinder one and telescopic cylinder two are fitted with telescopic dust covers.

[0024] By adopting the above structural design, the dust cover can prevent external dust, mud, moisture and other impurities from entering the interior of telescopic cylinder one and telescopic cylinder two, avoiding oil leakage or jamming caused by wear of piston rod and seals due to impurities, and extending the service life of telescopic cylinder one and telescopic cylinder two; especially in muddy and dusty outdoor working environments, it can significantly improve the working reliability of telescopic cylinder one and telescopic cylinder two and reduce the frequency of maintenance.

[0025] As a preferred implementation of a tracked chassis, the surfaces of hinge shaft one, hinge shaft two, hinge shaft three, and hinge shaft four are all provided with a wear-resistant coating.

[0026] By adopting the above structural scheme, wear on hinge shaft 1, hinge shaft 2, hinge shaft 3 and hinge shaft 4 during rotation is reduced, service life is extended, flexible rotation performance at each hinge is guaranteed, and maintenance frequency is reduced.

[0027] The beneficial effects of this utility model include:

[0028] The intersecting telescopic cylinders one and two, along with the connecting rod, form two opposing triangular structures. These two triangles combine to create a variable rectangular structure. The shape of this rectangle can be altered by extending and retracting the telescopic cylinders, allowing for flexible adjustment of the distance between the tracks and the transition beam. This enables the chassis to expand and contract, adapting to different operational scenarios. The triangles possess geometric stability, maintaining connection strength during the extension and retraction of the telescopic cylinders and preventing chassis swaying due to deflection or load changes, significantly improving the stability of the track-transition beam connection. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the structure of a tracked chassis when deployed in a specific embodiment of this utility model;

[0031] Figure 2 This is a schematic diagram of the structure of a tracked chassis when it is retracted in a specific embodiment of this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of a tracked chassis with one side extended and the other side retracted in a specific embodiment of the present utility model;

[0033] Figure 4 This is a top view of a tracked chassis according to a specific embodiment of the present utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the telescopic dust cover in a specific embodiment of this utility model.

[0035] List of components and reference numerals:

[0036] 1. Track; 2. Transition beam; 3. Telescopic cylinder one; 4. Telescopic cylinder two; 5. Hinge shaft one; 6. Hinge shaft two; 7. Hinge shaft three; 8. Hinge shaft four; 9. Connecting rod; 10. Telescopic dust cover. Detailed Implementation

[0037] 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 in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Reference Figure 1-5 This embodiment proposes a tracked chassis, including two tracks 1, with a transition beam 2 between the two tracks 1. The two tracks 1 are symmetrically arranged on both sides of the transition beam 2, and the length direction of the transition beam 2 is consistent with the walking direction of the tracks 1. Each track 1 and the transition beam 2 is provided with a telescopic cylinder 3 and a telescopic cylinder 4 arranged in a cross-slope manner. The telescopic cylinder 3 and the telescopic cylinder 4 are both covered with a telescopic dust cover 10, which can prevent external dust, mud, moisture and other impurities from entering the interior of the telescopic cylinder 3 and the telescopic cylinder 4.

[0039] One end of telescopic cylinder 3 is hinged to track 1 via hinge shaft 5, and the other end of telescopic cylinder 3 is hinged to transition beam 2 via hinge shaft 6. One end of telescopic cylinder 4 is hinged to track 1 via hinge shaft 7, and the other end of telescopic cylinder 4 is hinged to transition beam 2 via hinge shaft 8. Hinges 6 on both sides of transition beam 2 are symmetrically arranged about transition beam 2, and hinge shafts 8 on both sides of transition beam 2 are symmetrically arranged about transition beam 2. The surfaces of hinge shafts 5, 6, 7, and 8 are all coated with a wear-resistant coating, which can reduce wear on hinge shafts 5, 6, 7, and 8 during rotation, extend service life, and ensure flexible rotation performance at each hinge.

[0040] Two connecting rods 9 are provided between each track 1 and the transition beam 2. The surface of the connecting rods 9 is coated with an anti-corrosion coating to resist corrosion from outdoor humid and acidic / alkaline environments, extending the service life of the connecting rods 9 and reducing chassis maintenance costs. One end of the connecting rod 9 is hinged to the track 1 via hinge shaft 5, and the other end of the connecting rod 9 is hinged to the transition beam 2 via hinge shaft 8. The two connecting rods 9 between each track 1 and the transition beam 2 are respectively located at both ends of the track 1 in the direction of travel, ensuring that the front and rear ends of the track 1 are supported in the direction of travel when the chassis moves forward, backward, or uphill, preventing excessive force on one end from causing warping or swaying.

[0041] Each track 1 and transition beam 2 is connected by one telescopic cylinder 3 and two telescopic cylinders 4. By increasing the number of telescopic cylinders 4, the load can be distributed to multiple support points, reducing the stress load, lowering the risk of cylinder damage, and extending service life. Multiple telescopic cylinders working together provide more stable and accurate control over the chassis's deployment and retraction. Furthermore, if one telescopic cylinder 4 fails, another can still assist, improving the reliability of the chassis operation. Telescopic cylinder 3 and the two telescopic cylinders 4 are arranged sequentially along the travel direction of track 1. The telescopic cylinders 3 and 4 on both sides of transition beam 2 can extend and retract independently, allowing for individual adjustment of the distance between track 1 and transition beam 2 on one side, adapting to asymmetrical terrain and improving off-road capability.

[0042] In this embodiment, the intersecting and tilting telescopic cylinders 3 and 4, along with the connecting rod 9, form two opposing triangular structures. These two opposing triangles create a variable rectangular structure. The shape of this rectangle can be changed by extending and retracting the telescopic cylinders 3 and 4, allowing for flexible adjustment of the distance between the track 1 and the transition beam 2. This enables the chassis to expand and contract, adapting to different operating scenarios. The triangles possess geometric stability, maintaining connection strength during the extension and retraction of the telescopic cylinders 3 and 4, preventing chassis swaying due to deflection or load changes, and significantly improving the stability of the connection between the track 1 and the transition beam 2.

[0043] Work process:

[0044] When the chassis is initially fully extended, the distance between the two tracks 1 is at its maximum, the horizontal height of the transition beam 2 is at its minimum, the telescopic cylinder 3 is at its shortest length, and the telescopic cylinder 4 is at its longest length. When the chassis is initially fully retracted, the distance between the two tracks 1 is at its minimum, the horizontal height of the transition beam 2 is at its maximum, the telescopic cylinder 3 is at its longest length, and the telescopic cylinder 4 is at its shortest length.

[0045] When the chassis needs to retract, the hydraulic control system controls the telescopic cylinders 3 and 4 on both sides of the track 1 and transition beam 2 to extend synchronously and retract synchronously. The telescopic cylinders 3 and 4 work together: when telescopic cylinder 3 extends, its ends push the transition beam 2 upwards; when telescopic cylinder 4 retracts, its ends pull the track 1 closer to the transition beam 2. As telescopic cylinder 3 extends and telescopic cylinder 4 retracts, the "variable rectangle" structure formed by their intersection gradually narrows, the distance between the track 1 and transition beam 2 decreases, and the tilt angle of the connecting rod 9 approaches vertical, but always maintains a stable triangular structure with telescopic cylinders 3 and 4 to avoid swaying. Due to symmetrical force on both sides, the transition beam 2 gradually rises in horizontal height and always remains horizontal. When the distance between the two track 1 sides retracts to the preset width, the hydraulic control system controls telescopic cylinder 3 to stop extending and telescopic cylinder 4 to stop retracting. At this point, the overall structure is compact and suitable for passage through narrow spaces.

[0046] When the chassis needs to be deployed, the hydraulic control system controls the telescopic cylinders 3 and 4 on both sides of the track 1 and transition beam 2 to retract synchronously and extend synchronously. The telescopic cylinders 3 and 4 work together: when telescopic cylinder 3 retracts, its ends pull the transition beam 2 downwards; when telescopic cylinder 4 extends, its ends push the track 1 away from the transition beam 2. As telescopic cylinder 3 retracts and telescopic cylinder 4 extends, the "variable rectangle" structure formed by their intersection gradually widens, the distance between the track 1 and transition beam 2 increases, and the tilt angle of the connecting rod 9 approaches horizontal, maintaining a stable triangular structure with telescopic cylinders 3 and 4 to prevent swaying. Due to symmetrical force on both sides, the transition beam 2 gradually decreases in height and remains horizontal. When the distance between the two track 1 sides reaches the preset width, the hydraulic control system controls telescopic cylinder 3 to stop retracting and telescopic cylinder 4 to stop extending. At this point, the overall structure is wider, suitable for stable passage in situations with sufficient space.

[0047] When the working surface height is asymmetrical, only one side of the track 1 can be adjusted, while the other side remains stationary, as shown in the reference. Figure 3 Taking the example of the left track 1 being close to the transition beam 2 while the right track 1 remains stationary, the hydraulic control system controls the left telescopic cylinder 3 to extend and the left telescopic cylinder 4 to retract, while the right telescopic cylinders 3 and 4 remain stationary. At this time, the left "variable rectangle" structure narrows, the distance between the left track 1 and the transition beam 2 narrows, the left connecting rod 9 becomes closer to vertical, the transition beam 2 is raised relative to the left track 1, and the height of the left track 1 is lower than the height of the right track 1.

[0048] 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 tracked chassis comprising two tracks (1), characterized in that, A transition beam (2) is provided between the two tracks (1). The length direction of the transition beam (2) is consistent with the walking direction of the track (1). Each track (1) and the transition beam (2) is provided with a telescopic cylinder 1 (3) and a telescopic cylinder 2 (4) arranged in a cross-slope configuration. One end of the telescopic cylinder 1 (3) is hinged to the track (1) through a hinge shaft 1 (5), and the other end of the telescopic cylinder 1 (3) is hinged to the transition beam (2) through a hinge shaft 2 (6). One end of the telescopic cylinder 2 (4) is hinged to the track (1) through a hinge shaft 3 (7), and the other end of the telescopic cylinder 2 (4) is hinged to the transition beam (2) through a hinge shaft 4 (8). Each track (1) and the transition beam (2) is provided with a connecting rod (9). One end of the connecting rod (9) is hinged to the track (1) through a hinge shaft 1 (5), and the other end of the connecting rod (9) is hinged to the transition beam (2) through a hinge shaft 4 (8).

2. The tracked chassis according to claim 1, characterized in that, Each track (1) is connected to a transition beam (2) by a telescopic cylinder one (3) and two telescopic cylinders two (4).

3. A tracked chassis according to claim 1, characterized in that, Two tracks (1) are symmetrically arranged on both sides of the transition beam (2).

4. A tracked chassis according to claim 3, characterized in that, The hinge shafts 2 (6) on both sides of the transition beam (2) are symmetrically arranged about the transition beam (2), and the hinge shafts 4 (8) on both sides of the transition beam (2) are symmetrically arranged about the transition beam (2).

5. A tracked chassis according to claim 1, characterized in that, The telescopic cylinders 1 (3) and 2 (4) on both sides of the transition beam (2) are set independently.

6. A tracked chassis according to claim 1, characterized in that, Two connecting rods (9) are provided between each track (1) and the transition beam (2).

7. A tracked chassis according to claim 6, characterized in that, Two connecting rods (9) between each track (1) and the transition beam (2) are respectively set at both ends of the track (1) in the direction of travel.

8. A tracked chassis according to claim 1, characterized in that, The surface of the connecting rod (9) is coated with an anti-corrosion coating.

9. A tracked chassis according to claim 1, characterized in that, Telescopic dust covers (10) are fitted on the outside of telescopic cylinder one (3) and telescopic cylinder two (4).

10. A tracked chassis according to claim 1, characterized in that, The surfaces of hinge shaft one (5), hinge shaft two (6), hinge shaft three (7) and hinge shaft four (8) are all provided with wear-resistant coatings.

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