Front axle structure and aerial work platform

Abstract

The application provides a front axle structure and an aerial work platform, and relates to the technical field of aerial work platforms. The front axle structure comprises: a first swing part on a beam main body, the beam main body swings around the first swing part; two knuckles, the two knuckles are respectively hingedly arranged at the two ends of the beam main body, the beam main body and the knuckles are integrally formed, and the knuckles are used for being connected with wheels; a local reinforcing part is arranged at a stress concentration area of the beam main body and is integrally formed with the beam main body; and a driving assembly, the two knuckles are connected with the driving assembly. According to the application, the beam main body and the knuckles are integrally formed, welding joints are avoided, stress concentration is reduced, the local reinforcing part changes a stress transmission path, load is dispersed, the possibility of local deformation of the beam main body is reduced, the beam main body is swung up and down through the first swing part, and therefore, the beam main body can adapt to complex ground.

Description

Technical Field

[0001] This application relates to the field of aerial work platform technology, and more particularly to a front axle structure and an aerial work platform. Background Technology

[0002] Aerial work platforms are widely used in construction, power maintenance, bridge maintenance, factory equipment installation and other work scenarios, especially in complex terrains (such as muddy ground, mountains, and uneven roads).

[0003] In related technologies, the front axle structure of aerial work platforms uses a welded structure to achieve load-bearing and steering. The front axle structure includes a steering knuckle, steering linkage, multiple crossbeams, and a steering cylinder. The multiple crossbeams are welded to form a crossbeam frame, the steering knuckle is welded to the crossbeams, and the steering cylinder and linkage are controlled by pins to achieve left and right steering.

[0004] However, the welded joints of the aforementioned front axle structure are prone to stress concentration areas and weld fatigue, which leads to local deformation of the crossbeam after long-term loading. Furthermore, the crossbeam lacks the ability to swing up and down, making it unable to effectively conform to uneven ground, resulting in wheel slippage or insufficient grip, and making it unable to adapt to complex terrain. Utility Model Content

[0005] This application provides a front axle structure and an aerial work platform vehicle that avoids welded joints and prevents local deformation of the crossbeams, and adapts to complex terrain by swinging up and down.

[0006] To achieve the above objectives, the technical solution of this application is as follows:

[0007] On one hand, this application provides a front axle structure, including: a crossbeam body with a first swing member on the crossbeam body, the crossbeam body being configured to swing around the first swing member; two steering knuckles, the two steering knuckles being respectively hinged to both ends of the crossbeam body, the crossbeam body and the steering knuckles being integrally formed, the steering knuckles being used to connect with wheels; a local reinforcement member, the local reinforcement member being disposed in the stress concentration area of ​​the crossbeam body and integrally formed with the crossbeam body; and a drive assembly, the two steering knuckles being connected to the drive assembly, the drive assembly being configured to drive the steering knuckles to rotate, thereby turning the wheels.

[0008] In one possible implementation, the front axle structure in this embodiment further includes two floating mechanisms, which are disposed opposite to each other on the crossbeam body, and a first swing member is located between the two floating mechanisms. The crossbeam body is configured such that when the floating mechanisms are opened, the crossbeam body swings around the first swing member.

[0009] In one possible implementation, the front axle structure in this embodiment has arc-shaped guide grooves at both ends of the crossbeam body facing the steering knuckle, and local reinforcing members are disposed within the arc-shaped guide grooves.

[0010] In one possible implementation, in the front axle structure of this application embodiment, local reinforcing members are sequentially arranged on the inner sidewall of the arc-shaped guide groove along the extension direction of the arc-shaped guide groove.

[0011] In one possible implementation, the front axle structure in this embodiment of the application has at least one arc-shaped segment on the steering knuckle, one end of which extends to the hinge point between the steering knuckle and the crossbeam body.

[0012] In one possible implementation, the front axle structure in this embodiment of the application has multiple arc-shaped segments, which are arranged sequentially along the periphery of the steering knuckle.

[0013] In one possible implementation, the front axle structure in this application embodiment includes a drive cylinder with two telescopic ends and a first connecting end on the steering knuckle. The telescopic ends and the first connecting end are hinged to each other. The drive cylinder is configured to drive the two telescopic ends to extend and / or retract, so as to rotate the steering knuckle through the first connecting end.

[0014] In one possible implementation, the front axle structure in this embodiment of the application further includes a steering linkage. The steering linkage is located on one side of the drive cylinder, and the steering knuckle has a second connecting end. The two ends of the steering linkage are respectively hinged to the second connecting ends of the two steering knuckles.

[0015] In one possible implementation, the front axle structure in this embodiment of the application has an extension on the main body of the crossbeam, the drive cylinder is connected to the extension, and the extension and the first swing member are both located on the central axis of the main body of the crossbeam.

[0016] On the other hand, this application also provides an aerial work platform vehicle, including a vehicle body and a front axle structure of any of the above embodiments mounted on the vehicle body.

[0017] This application provides a front axle structure and an aerial work platform vehicle. The front axle structure includes a crossbeam body with a first swing member, the crossbeam body being configured to swing around the first swing member; two steering knuckles, each hinged to one end of the crossbeam body, the crossbeam body and the steering knuckles being integrally formed, the steering knuckles being used to connect to the wheels; local reinforcement members, located in stress concentration areas of the crossbeam body and integrally formed with the crossbeam body; and a drive assembly, with both steering knuckles connected to the drive assembly, the drive assembly being configured to drive the steering knuckles to rotate, thereby steering the wheels. In this embodiment, the integral forming of the crossbeam body and steering knuckles (e.g., integral casting) avoids welding joints and reduces stress concentration. The steering knuckles are hinged to the crossbeam body, forming a stable steering support structure. The steering knuckles rotate around the hinge point under the drive of a steering cylinder, steering the wheels. The local reinforcement members are located in stress concentration areas of the crossbeam body (e.g., the hinge between the steering knuckles and the crossbeam body), changing the stress transmission path, dispersing the load, and reducing the possibility of local deformation of the crossbeam body. When the aerial work platform vehicle is in motion, the main body of the crossbeam swings up and down through the first swinging component. For example, on uneven roads, when one wheel is raised, the main body of the crossbeam swings upward around the swinging component, so that the other wheel maintains ground pressure and ensures grip, thus adapting to complex terrain. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1 This is a schematic diagram of the front axle structure provided in an embodiment of this application;

[0020] Figure 2 for Figure 1 A structural schematic diagram of the front axle structure from another perspective;

[0021] Figure 3 for Figure 2 Enlarged structural diagram of section A;

[0022] Figure 4 This is a structural schematic diagram of the floating mechanism in the front axle structure provided in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the connection between the front axle structure and the vehicle body, provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10-Wheel; 11-Wheel hub; 20-Frame; 100-Crossbeam body; 101-Guide groove; 102-Mounting position; 103-First support surface; 104-First side; 110-Extension; 200-First swing member; 300-Steering knuckle; 301-Hinged end; 310-First connecting end; 320-Second connecting end; 330-Arc segment; 400-Partial reinforcement; 500-Drive assembly; 510-Drive cylinder; 520-Telescopic end; 530-Steering linkage; 600-Floating mechanism; 610-Floating cylinder solenoid valve.

[0026] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0028] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and are not intended to indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0029] Furthermore, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Aerial work platforms are widely used in construction, power maintenance, bridge maintenance, factory equipment installation and other work scenarios, especially in complex terrains (such as muddy ground, mountains, and uneven roads).

[0032] In related technologies, the front axle structure of aerial work platforms uses a welded structure to achieve both load-bearing and steering. The front axle structure is assembled by welding components such as the crossbeam, steering knuckle, and steering linkage. Specifically, the crossbeam is fixed into an integral frame by welding, the steering knuckle is connected to the crossbeam by welding, and the steering cylinder and linkage are controlled by pins.

[0033] It is understandable that welded joints are prone to forming stress concentration areas, which can lead to local deformation of the crossbeam after long-term loading, affecting the load-bearing capacity and steering accuracy of the front axle. Moreover, the welded connection method makes the crossbeam prone to fatigue cracks under dynamic loads (such as driving on bumpy roads).

[0034] Moreover, the front axle structure in the relevant technology lacks the ability to swing up and down, and cannot effectively conform to uneven ground, resulting in wheel slippage or insufficient grip, and poor adaptability to complex road conditions.

[0035] In addition, the lack of coordination in the four-wheel steering of the front axle structure in related technologies can easily cause tire dragging, accelerated wear, and reduced tire life.

[0036] Therefore, the aforementioned front axle structure has weak welding points, and due to weld fatigue caused by welding, the weld joint is prone to forming a stress concentration area. After long-term loading, this leads to local deformation of the crossbeam. Furthermore, the aforementioned front axle structure lacks the ability to swing up and down, and cannot effectively conform to uneven ground, resulting in wheel slippage or insufficient grip, which affects the equipment's ability to get out of trouble.

[0037] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] On the one hand, this application provides a front axle structure, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The system includes: a crossbeam body 100, on which a first swing member 200 is provided, and the crossbeam body 100 is configured to swing around the first swing member 200; two steering knuckles 300, which are respectively hinged to both ends of the crossbeam body 100, and the crossbeam body 100 and the steering knuckles 300 are integrally formed, with the steering knuckles 300 used to connect with the wheel 10; a local reinforcement member 400, which is provided in the stress concentration area of ​​the crossbeam body 100 and integrally formed with the crossbeam body 100; and a drive assembly 500, to which both steering knuckles 300 are connected, and the drive assembly 500 is configured to drive the steering knuckles 300 to rotate, thereby turning the wheel 10.

[0039] The main body 100 of the crossbeam is formed by integral casting. The main body 100 has a first support surface 103, a first side surface 104, a second support surface, and a second side surface connected sequentially. The first support surface 103 and the second support surface are opposite to each other, and the first side surface 104 and the second side surface are opposite to each other. Each steering knuckle 300 has two hinge ends 301, which are respectively positioned on the first support surface 103 and the second support surface. The wheel hub 11 of the wheel 10 is connected to the steering knuckle 300.

[0040] This application also includes a hinge shaft and a first bending plate. The hinge end 301 has a first hinge hole, and both the first support surface 103 and the second support surface have second hinge holes. The first bending plate has a third hinge hole. The hinge shaft passes through the first hinge hole, the second hinge hole, and the third hinge hole in sequence, thereby hinged the hinge end 301 to the crossbeam body 100, allowing the steering knuckle 300 to rotate. Furthermore, the first bending plate is also used for connection to other components of the vehicle frame.

[0041] The first bending plate includes a first horizontal segment, a vertical segment, and a second horizontal segment connected in sequence. The second horizontal segment is located above the first horizontal segment, and the first horizontal segment has a third hinge hole. The second horizontal segment may also be provided with a connecting part for connection with other components of the vehicle body.

[0042] The embodiments of this application do not limit the number of hinge shafts and first bending plates. For example, the number of hinge shafts is four, the number of first bending plates is two, and both first bending plates are disposed on the first support surface 103.

[0043] A first swing member 200 is provided on the top of the crossbeam body 100, and the first swing member 200 is a swing pin. The crossbeam body 100 has pin holes, for example, some pin holes are located on the first side 104.

[0044] Stress concentration areas in the main body 100 of the crossbeam, such as the periphery of the first swing member 200 and the support pin that is hinged to the steering knuckle 300.

[0045] By setting the swing pin on the upper end of the crossbeam body 100, the entire front axle can swing up and down. When driving on complex roads with uneven surfaces and large undulations, the front axle can adjust its posture at any time to ensure that the wheels 10 are in close contact with the ground, significantly improving the vehicle's grip and effectively enhancing its ability to get out of trouble in harsh conditions such as mud and mountains.

[0046] The main body of the crossbeam 100 is integrally cast to reduce manufacturing costs, eliminate weak points in welding and weld fatigue caused by welding. At the same time, integral casting can significantly improve the load-bearing capacity, stress dispersion capacity and deformation of the crossbeam 100 by strengthening the local structure.

[0047] In this embodiment, both the crossbeam body 100 and the steering knuckle 300 are integrally formed (e.g., using a one-piece casting process), avoiding welded joints and reducing stress concentration. The steering knuckle 300 is hinged to the crossbeam body 100, forming a stable steering support structure. Driven by the steering cylinder, the steering knuckle 300 rotates around the hinge point, turning the wheels 10. Local reinforcement members 400 are located in stress concentration areas of the crossbeam body 100 (e.g., the hinge point between the steering knuckle 300 and the crossbeam body 100), changing the stress transmission path, dispersing the load, and reducing the possibility of local deformation of the crossbeam body 100. When the aerial work platform is in motion, the crossbeam body 100 swings up and down via the first swing member 200. For example, on uneven surfaces, when one wheel 10 is raised, the crossbeam body 100 swings upward around the swing member, keeping the other wheel 10 grounded and ensuring grip, thus adapting to complex terrain.

[0048] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 It also includes two floating mechanisms 600, which are arranged opposite to each other on the crossbeam body 100, and the first swing member 200 is located between the two floating mechanisms 600. The crossbeam body 100 is configured such that when the floating mechanism 600 is opened, the crossbeam body 100 swings around the first swing member 200.

[0049] The floating mechanism 600 is a floating hydraulic cylinder, and the first swing element 200 is disposed between the two floating hydraulic cylinders. The floating mechanism 600 is disposed on the mounting position 102 of the crossbeam body 100.

[0050] The main body of the crossbeam 100 is moved vertically by the drive of the floating hydraulic cylinder, and the main body of the crossbeam 100 swings up and down vertically around the first swing member 200 by two floating hydraulic cylinders.

[0051] The extension direction of the floating cylinder is perpendicular to the extension direction of the drive cylinder 510.

[0052] It also includes a floating cylinder solenoid valve 610 to control the opening of the floating mechanism 600.

[0053] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Both ends of the crossbeam body 100 facing the steering knuckle 300 have arc-shaped guide grooves 101, and local reinforcing members 400 are set in the arc-shaped guide grooves 101.

[0054] The guide groove 101 facilitates stress dispersion in the main body 100 of the crossbeam, providing a buffering and dispersing effect. Furthermore, the local reinforcing member 400 is installed in the guide groove 101, thickening and strengthening it. The bottom of the guide groove 101 faces the central axis of the main body 100 of the crossbeam, and the opening of the guide groove 101 faces the steering knuckle 300.

[0055] In one possible implementation, combining Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In the front axle structure of this application embodiment, the local reinforcement 400 is sequentially arranged on the inner sidewall of the arc-shaped guide groove 101 along the extension direction of the arc-shaped guide groove 101.

[0056] Within the guide groove 101, reinforcing members are continuously arranged along the groove direction, thereby thickening the inner wall of the arc-shaped guide groove 101. The reinforcing members are integrally cast with the main body of the crossbeam 100, without interface defects.

[0057] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The steering knuckle 300 has at least one arc-shaped segment 330, one end of which extends to the hinge point between the steering knuckle 300 and the crossbeam body 100.

[0058] The arc segment 330 reduces the concentrated stress between the steering knuckle 300 and the main body of the crossbeam 100.

[0059] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5There are multiple arc-shaped segments 330, which are arranged sequentially along the circumference of the steering knuckle 300.

[0060] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The drive assembly 500 includes a drive cylinder 510 having two telescopic ends 520. The steering knuckle 300 has a first connecting end 310. The telescopic ends 520 and the first connecting end 310 are hinged to each other. The drive cylinder 510 is configured to drive the two telescopic ends 520 to extend and / or retract, so as to rotate the steering knuckle 300 through the first connecting end 310.

[0061] An extension 110 is provided on the first side 104 of the crossbeam body 100. The extension 110 is connected to one end of the drive cylinder 510 to fix the drive cylinder 510 on the crossbeam body 100.

[0062] The number of drive cylinders 510 can be one, and the drive cylinder 510 has two telescopic ends 520.

[0063] Alternatively, there may be two drive cylinders 510, which are arranged opposite to each other on the extension 110. The two drive cylinders 510 correspond to the two telescopic ends 520 respectively, and the telescopic ends 520 are connected to the first connecting end 310 of the steering knuckle 300.

[0064] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The drive assembly 500 also includes a steering link 530, which is located on one side of the drive cylinder 510. The steering knuckle 300 has a second connecting end 320, and the two ends of the steering link 530 are respectively hinged to the second connecting ends 320 of the two steering knuckles 300.

[0065] The two steering knuckles 300 and the crossbeam body 100 form four connecting hinge points.

[0066] The steering linkage 530, through coordinated movement with the crossbeam body 100 and the steering knuckle 300, synchronously adjusts the steering angle of the four wheels, reduces eccentric load, and lowers tire wear.

[0067] Through the synergy of the four-point hinge and the steering link 530, the steering centers of the four wheels are brought closer to the same geometric center. The four-point hinge, by setting multiple hinge points (such as the bottom four-point support surface) between the crossbeam body 100 and the steering knuckle 300, makes the motion trajectory of each wheel more consistent with the Ackermann steering principle during steering. The steering link 530, through its multi-point connection with the crossbeam body 100 and the steering knuckle 300, adjusts the steering angle of each wheel, reduces the difference in steering radius between the inner and outer wheels, reduces tire drag and slippage during steering, and makes the contact force between the tire and the ground more concentrated on rolling friction rather than lateral sliding friction.

[0068] It should be noted that the Ackermann steering principle is that when a vehicle turns, the inner wheel has a larger steering angle than the outer wheel, so that the steering axes of all wheels 10 approximately intersect at a point on the center line of the rear axle, thereby achieving smooth turning.

[0069] When the aerial work platform vehicle travels on complex road conditions, the main body of the crossbeam 100 swings up and down via a swing pin at the top. For example, on uneven surfaces, when one wheel 10 is raised, the main body of the crossbeam 100 rotates around the swinging component, keeping the other wheel 10 in contact with the ground and ensuring traction. Simultaneously, the drive cylinder 510, driven hydraulically, transmits power to the steering knuckle 300, causing it to rotate around the hinge point and steer the wheel 10. The steering linkage 530, through coordinated movement with the main body of the crossbeam 100 and the steering knuckle 300, synchronously adjusts the steering angle of the four wheels, reducing eccentric load and tire wear.

[0070] In one possible implementation, the front axle structure in this embodiment of the application, combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The main body 100 of the crossbeam has an extension 110, and the drive cylinder 510 is connected to the extension 110. The extension 110 and the first swing member 200 are both located on the central axis of the main body 100 of the crossbeam.

[0071] On the other hand, this application also provides an aerial work platform vehicle, such as... Figure 5 As shown, it includes a vehicle body and a front axle structure of any of the above embodiments mounted on the vehicle body.

[0072] The aerial work platform includes a vehicle body, which includes a frame 20, a rear axle structure, and a front axle structure. The rear axle structure is welded to the frame 20, and the front axle structure is detachably connected to the frame 20, such as by a threaded connection.

[0073] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A front axle structure, characterized in that, include: A crossbeam body having a first swing member, the crossbeam body being configured to swing about the first swing member; Two steering knuckles are respectively hinged at both ends of the crossbeam body. The crossbeam body and the steering knuckles are integrally formed. The steering knuckles are used to connect with the wheels. A local reinforcement member is provided in the stress concentration area of ​​the main body of the crossbeam and is integrally formed with the main body of the crossbeam. A drive assembly, to which both steering knuckles are connected, the drive assembly being configured to drive the steering knuckles to rotate, thereby steering the wheels.

2. The front axle structure according to claim 1, characterized in that, It also includes two floating mechanisms, which are disposed opposite to each other on the crossbeam body, and the first swing member is located between the two floating mechanisms. The crossbeam body is configured to swing around the first swing member when the floating mechanisms are open.

3. The front axle structure according to claim 1 or 2, characterized in that, Both ends of the crossbeam body facing the steering knuckle have arc-shaped guide grooves, and the local reinforcement is disposed in the arc-shaped guide grooves.

4. The front axle structure according to claim 3, characterized in that, The local reinforcing members are sequentially arranged on the inner sidewall of the arc-shaped guide groove along the extension direction of the arc-shaped guide groove.

5. The front axle structure according to claim 1 or 2, characterized in that, The steering knuckle has at least one arc-shaped segment, one end of which extends to the hinge point between the steering knuckle and the crossbeam body.

6. The front axle structure according to claim 5, characterized in that, The number of arc-shaped segments is multiple, and the multiple arc-shaped segments are arranged sequentially along the circumference of the steering knuckle.

7. The front axle structure according to claim 1 or 2, characterized in that, The drive assembly includes a drive cylinder having two telescopic ends. The steering knuckle has a first connecting end, and the telescopic ends are hinged to the first connecting end in a one-to-one correspondence. The drive cylinder is configured to drive the two telescopic ends to extend and / or retract, so as to rotate the steering knuckle through the first connecting end.

8. The front axle structure according to claim 7, characterized in that, The drive assembly also includes a steering link located on one side of the drive cylinder. The steering knuckle has a second connecting end, and the two ends of the steering link are respectively hinged to the second connecting ends of the two steering knuckles.

9. The front axle structure according to claim 7, characterized in that, The main body of the crossbeam has an extension, the driving cylinder is connected to the extension, and the extension and the first swing member are both located on the central axis of the main body of the crossbeam.

10. An aerial work platform vehicle, characterized in that, Includes a vehicle body and a front axle structure as described in any one of claims 1-9 mounted on the vehicle body.

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