Disconnected axle assembly and all-terrain crane

Abstract

The invention belongs to the field of engineering machinery, and discloses a disconnected axle assembly and an all-terrain crane, the disconnected axle assembly is used for being installed on a frame rotation section and comprises a left axle and a right axle, the left axle and the right axle are distributed on the two sides of the frame rotation section, and the left axle and the right axle are connected with the frame rotation section through respective suspension oil cylinders; and the wheel side driving motors are mounted in the left axle and the right axle and are used for rotationally driving the wheels on the two sides. The invention provides a disconnected axle assembly of an independent suspension and a wheel side hydraulic auxiliary driving system of the disconnected axle assembly. A mechanical drive axle and a wheel side hydraulic drive axle can be driven at the same time through a single engine. Compared with the prior art, the height of the whole vehicle can be reduced, the height of the gravity center can be reduced, the running anti-roll capacity is improved, running is safer, wheel edge liquid driving force can be increased, the dynamic property of the whole vehicle is improved, the wheel edge liquid driving force can be selectively input according to the running working condition of the vehicle, and control is flexible and convenient.

Description

Technical Field

[0001] The present application belongs to the field of engineering machinery, and in particular, relates to a disconnecting axle assembly and an all-terrain crane. Background Art

[0002] The super-large all-terrain cranes for wind power construction generally have the following features: Figure 1 , Figure 2 The 9 bridges or more bridges shown have an increasing deadweight, and their bearing capacity and dynamic performance requirements are further improved to adapt to the poor road surface conditions, large slopes, and complex terrain of the wind farm sites.

[0003] Moreover, the crane frame is equipped with a slewing device. When the drive axle is arranged under the slewing, the bottom plane of the frame slewing needs to be further raised. At this time, the center of gravity of the whole vehicle is higher and the anti-rolling performance is poor. Figure 3 As shown in the figure, the axle under the swing device is arranged as a non-drive axle. On the one hand, the frame swing part structural parts are the main force-bearing parts, occupying more height space. To ensure driving safety, the height of the center of gravity of the whole vehicle should be reduced as much as possible. On the other hand, the adaptability of the suspension to the ground is guaranteed by the suspension travel, that is, the upward jump of the axle relative to the frame must meet the standard requirements. Under comprehensive consideration, the height of the frame swing bottom plane from the wheel center plane is usually designed to be higher, which inevitably causes the center of gravity of the whole vehicle to be higher and the anti-roll performance of driving to be poor. Summary of the invention

[0004] The purpose of the present application is to provide a disconnecting axle assembly and an all-terrain crane to improve the structural performance and driving dynamics performance of the entire vehicle.

[0005] To achieve the above objectives, the present application provides a disconnected axle assembly, which is used to be installed on a rotating section of a vehicle frame and includes: The left axle and the right axle are distributed on both sides of the frame rotating section, and the left axle and the right axle are respectively connected to the frame rotating section through their own suspension cylinders; The wheel-side drive motors are installed in the left axle and the right axle and are used to rotate and drive the wheels on both sides.

[0006] In some embodiments, the disconnect axle assembly includes: A left swing arm, the left end of which is hinged to the left axle; A right swing arm, the right end of which is hinged to the right axle; Wherein, the frame rotating section is provided with a bottom support, and the right end of the left swing arm and the left end of the right swing arm are respectively hinged to the two sides of the bottom support.

[0007] In some embodiments, the left axle and the right axle both include a wheel-side steering knuckle, the top end of the wheel-side steering knuckle is connected to the bottom end of the suspension cylinder, and the bottom end of the wheel-side steering knuckle is hinged to the left swing arm or the right swing arm.

[0008] In some embodiments, the wheel drive motor is a hydraulic motor or an electric motor.

[0009] The present application also provides an all-terrain crane, which includes the above-mentioned disconnecting axle assembly.

[0010] In some embodiments, the all terrain crane comprises: a mechanical drive system including a plurality of first integral axles driven by a chassis engine; The whole-bridge hydraulic drive system includes a plurality of second integral vehicle axles driven by the undercarriage hydraulic system; A wheel drive system, comprising the disconnect axle assembly driven by the wheel drive motor; Among them, the plurality of the first integral axles, the plurality of the second integral axles and the disconnect axle assembly are all drive axles.

[0011] In some embodiments, the all terrain crane includes a single undercarriage engine and an uppercar engine for driving the lowercar hydraulic system.

[0012] In some embodiments, the all terrain crane includes a controller configured to: Obtain the total target torque of the vehicle under the current driving condition; Determining that the total target torque of the entire vehicle is less than the mechanical drive torque that can be provided by the mechanical drive system; Controlling and starting the mechanical drive system; Determining that the total target torque of the whole vehicle is greater than the mechanical drive torque that can be provided by the mechanical drive system, and less than the sum of the mechanical drive torque and the hydraulic drive torque that can be provided by the whole-bridge hydraulic drive system; Controlling and starting the mechanical drive system and the whole-bridge hydraulic drive system; Determining that the total target torque of the whole vehicle is greater than the sum of the mechanical drive torque and the hydraulic drive torque that can be provided by the whole-bridge hydraulic drive system; Control and start the mechanical drive system, the whole-bridge hydraulic drive system and the wheel-side drive system.

[0013] In some embodiments, the wheel drive motor is a hydraulic motor, and the wheel drive system includes: A transmission, arranged at the output end of the chassis engine and comprising a transmission power take-off device; A hydraulic pump is installed on the transmission power take-off device and is connected to the wheel-side drive motor through a hydraulic pipeline.

[0014] In some embodiments, the controller is further configured to: Determining that the all-terrain crane is in a heavy-load driving condition, and the total vehicle weight G is greater than a preset vehicle weight value and the real-time vehicle speed v is less than a preset vehicle speed value; Control and start the whole-bridge hydraulic drive system and the wheel-side drive system.

[0015] In some embodiments, the hydraulic pump is a variable displacement pump, the wheel drive motor is a variable displacement motor, and the controller is further configured to: determining that the first integral axle is slipping; Controlling and adjusting the displacement of the hydraulic pump to increase the wheel drive torque T3 that the wheel drive system can provide; Determining that the wheel side axle load distribution of the two side axles of the disconnect axle assembly is different; According to the ratio of the wheel axle loads on both sides, the motor displacements of the wheel drive motors on both sides are controlled and adjusted.

[0016] In the disconnected axle assembly of the present application, a disconnected axle as a drive axle is arranged below the frame rotary section to replace the integral axle, so that the arrangement of the vehicle structural parts is not affected by the axle main reducer, bridge housing, etc., and the height of the frame rotary part can be reduced according to the arrangement space, that is, the upper plane of the frame can be reduced as much as possible, thereby reducing the center of gravity of the vehicle, improving the anti-rolling performance, and enhancing the structural performance of the vehicle. The left and right wheel drive motors in the disconnected axle assembly can independently drive the left and right wheels, further improving the driving dynamics performance, and better adapting to turning, slipping and other working conditions.

[0017] Other advantages of the present application and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application but do not constitute a limitation to the present application. In the accompanying drawings: Figure 1 A top view of an axle drive system of an existing ultra-large all-terrain crane; Figure 2 for Figure 1 A front view of the axle drive system; Figure 3 It is a schematic diagram of the installation of the axle below the frame slewing section of the existing super large all terrain crane; Figure 4It is a structural schematic diagram of a disconnect type axle assembly according to a specific embodiment of the present application; Figure 5 This is the hydraulic drive schematic diagram of the wheel side drive motor; Figure 6 It is a schematic structural diagram of an axle drive system of an all-terrain crane according to a specific embodiment of the present application.

[0019] Description of Reference Numerals DETAILED DESCRIPTION

[0020] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present application and is not intended to limit the present application. It should be noted that, in the absence of conflict, the implementations in the present application and the features in the implementations can be combined with each other.

[0021] The disconnect axle assembly and the all-terrain crane of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] As mentioned above, arranging an integral non-driven axle or driven axle under the swing will be limited by the height size of the frame swing structure, making the center of gravity of the vehicle higher and the anti-roll performance poor, affecting driving safety.

[0023] In view of this, the present application discloses a novel disconnecting axle assembly. Figure 4 The disconnectable axle assembly 100 is used to be mounted to the frame rotary section 1 and comprises: The left axle 21 and the right axle 22 are distributed on both sides of the frame rotating section 1, and the left axle 21 and the right axle 22 are connected to the frame rotating section 1 through their own suspension cylinders 6; The wheel-side drive motor 3 is installed in the left axle 21 and the right axle 22 and is used to rotate and drive the wheels on both sides.

[0024] The present application arranges a drive axle below the frame rotation section 1 (i.e., the middle section of the frame connected to the crane upper body, on which a rotation device is installed), and the drive axle is a disconnected axle rather than an integral axle, so that the arrangement of the vehicle structural parts is not affected by the axle main reducer, the bridge housing, etc., and at the same time, the height of the frame rotation part can be reduced according to the arrangement space, that is, the upper plane of the frame can be lowered as much as possible, thereby reducing the center of gravity of the vehicle, improving the anti-rolling performance, and enhancing the structural performance of the vehicle.

[0025] The disconnected axle of the independent suspension is arranged below the frame revolving section 1. The so-called disconnected axle means that the left axle 21 and the right axle 22 are not coaxially driven, and are independent of each other. In this case, the left suspension installed between the left axle 21 and the frame revolving section 1 and the right suspension installed between the right axle 22 and the frame revolving section 1 are independent of each other and do not affect each other. Figure 4 In the embodiment, the bouncing of the suspension cylinder 6 on the left side will not transmit and affect the suspension cylinder 6 on the right side.

[0026] At the same time, the present application changes the axle below the rotation of the frame rotation section 1 from a non-drive axle to a wheel-side drive axle to further improve the driving dynamics. The wheel-side drive motors 3 on the left and right sides can independently drive the left and right wheels, respectively, so that the left and right wheels can independently adjust the wheel speed to adapt to turning conditions, etc.

[0027] Comparable, in Figure 3 In the axle below the existing frame rotation section shown, a non-driven axle is used. However, even so, in order to meet the suspension design requirements and avoid mechanical interference between the frame rotation part structural parts and the integral axle, the height of the frame rotation bottom plane from the wheel center plane is usually designed to be higher, which makes the structural performance of the whole vehicle worse.

[0028] See also Figure 4 The disconnect axle assembly 100 further includes: A left swing arm 41, the left end of which is hinged to the left axle 21; A right swing arm 42, the right end of which is hinged to the right axle 22; The frame rotating section 1 is provided with a bottom support 5 , and the right end of the left swing arm 41 and the left end of the right swing arm 42 are hinged to two sides of the bottom support 5 respectively.

[0029] It can be seen that the left and right axles are connected by an articulated swing arm, so that there is no correlation between the wheels on both sides and between the suspensions on both sides. The right end of the left swing arm 41 and the left end of the right swing arm 42 are respectively hinged to the two sides of the bottom support 5, and the bottom support 5 is welded to the bottom of the frame rotating section 1, so that the axle has a supporting effect on the bottom support 5, that is, supports the frame rotating section 1. Moreover, the disconnected axle will not produce contact interference with the bottom support 5. Of course, this is only an example, and the left and right axles of the disconnected axle and the axle and the frame rotating section 1 can also be connected through other structural parts.

[0030] Specifically, both the left axle 21 and the right axle 22 may include a wheel-side steering knuckle 7, the top end of the wheel-side steering knuckle 7 is connected to the bottom end of the suspension cylinder 6, and the bottom end of the wheel-side steering knuckle 7 is hinged to the left swing arm 41 or the right swing arm 42. In this way, the force of the independent suspension is transmitted to the axle through the wheel-side steering knuckle 7. In addition, the wheel-side drive motor 3 can be installed on a wheel-side reducer (not shown), located between the top end and the bottom end of the wheel-side steering knuckle 7, and connected to the wheel through the wheel-side steering knuckle 7.

[0031] It should be noted that the above-mentioned wheel-side drive motor 3 can be a hydraulic motor or an electric motor. The hydraulic motor has a large driving force and is suitable for heavy-load driving, while the electric motor has a fast response and a high speed and is suitable for flexible control of light loads.

[0032] The present application also discloses an all-terrain crane, which includes the above-mentioned disconnecting axle assembly 100. By adopting the disconnecting axle assembly 100, the center of gravity of the whole vehicle is lowered, the anti-rolling performance is improved, the structural performance of the whole vehicle is enhanced, and the driving dynamic performance is further improved through wheel side drive.

[0033] See also Figure 6 , the all-terrain crane of this embodiment may include: A mechanical drive system including a plurality of first integral axles 200 driven by a chassis engine 8; The whole bridge hydraulic drive system includes a plurality of second integral vehicle axles 300 driven by the vehicle disembarking hydraulic system; The wheel side drive system includes a disconnecting axle assembly 100 driven by a wheel side drive motor 3; The plurality of first integral axles 200 , the plurality of second integral axles 300 and the disconnect axle assembly 100 are all drive axles.

[0034] Comparatively, if Figure 1 As shown in the figure, super-large all-terrain cranes with nine or more axles generally use a combination of 6 axle mechanical drive and 2 axle hydraulic drive, a total of 8 axle drives, using mechanical and hydraulic hybrid drive, and the other axle is an integral non-driven axle 400. It can be seen that the existing super-large all-terrain cranes only have mechanical drive systems and whole-bridge hydraulic drive systems, and not all axles are driven axles.

[0035] And in Figure 6 The ultra-large all-terrain crane shown in the figure also has a 9-axle structure, using a combination of 6-axle mechanical drive and 2-axle hydraulic drive, and an additional disconnecting axle assembly 100 is added to replace Figure 1 In this way, all axles use drive axles, which can further improve driving dynamics and control flexibility and diversity. Different combinations of drive systems can be selected under different working conditions.

[0036] The power source of the multiple first integral axles 200 in the mechanical drive system is from the chassis engine 8. The power source of the multiple second integral axles 300 in the full-bridge hydraulic drive system is generally from the upper vehicle engine (not shown), that is, the upper vehicle engine drives the upper vehicle hydraulic pump to work, and the hydraulic pipeline passes through the rotary device to the lower vehicle hydraulic system, thereby driving the multiple second integral axles 300. The power source of the disconnectable axle assembly 100 can be obtained from nearby materials, such as Figure 5 As shown, the power comes from the chassis engine 8, and the power performance of the whole vehicle can be increased without the help of the upper vehicle engine or additional power source. It can be seen that the all-terrain crane of this embodiment may include a single chassis engine 8 and an upper vehicle engine for driving the lower vehicle hydraulic system. In other words, wheel-side hydraulic drive is suitable for crane products with only one engine in the whole vehicle, so that the power performance of the whole vehicle can be increased without the help of the upper vehicle engine or additional power source.

[0037] exist Figure 6 In the ultra-large all-terrain crane, the vehicle's axle drive system has three drive modes: mechanical drive, full-bridge hydraulic drive, and wheel-side drive, and all axles are drive axles. On this basis, the all-terrain crane can also include a controller for controlling each drive, and the controller can be configured as: Obtain the total target torque T of the vehicle under the current driving condition; Determine that the total target torque T of the whole vehicle is less than the mechanical drive torque T1 that can be provided by the mechanical drive system; Control and start the mechanical drive system; Determine that the total target torque T of the whole vehicle is greater than the mechanical drive torque T1 that can be provided by the mechanical drive system, and is less than the sum of the mechanical drive torque T1 and the hydraulic drive torque T2 that can be provided by the whole bridge hydraulic drive system; Control and start the mechanical drive system and the whole bridge hydraulic drive system; Determine that the total target torque T of the whole vehicle is greater than the sum of the mechanical drive torque T1 and the hydraulic drive torque T2 that can be provided by the whole bridge hydraulic drive system; Control and start the mechanical drive system, the entire bridge hydraulic drive system and the wheel side drive system.

[0038] It can be seen that the controller can match the appropriate drive system and its combination according to the required size of the total target torque T of the whole vehicle to avoid energy waste caused by insufficient or excessive driving force of the whole vehicle. As an example, specifically, the total target torque of the whole vehicle is , where G is the vehicle weight and ɑ is the road slope. The actual output torque of the vehicle is , It is the mechanical driving torque provided by the chassis engine 8 driving the mechanical drive axle (i.e., the first integral vehicle axle 200) through the transmission 9 and the transfer case (not shown). . is the hydraulic driving torque provided by the vehicle engine driving the hydraulic driving axle (i.e., the second integral vehicle axle 300), . It is the wheel hydraulic drive torque provided by the chassis engine 8 driving the two wheel drive motors 3 of the disconnecting axle assembly 100 through the transmission power take-off device. .

[0039] In each torque formula, T tq is the real-time torque of the engine, i g 、i d 、i a1 They are the transmission speed ratio, transfer case speed ratio, and mechanical drive axle speed ratio respectively. is the mechanical efficiency of the transmission system. g1 is the hydraulic motor displacement, is the hydraulic motor pressure difference, i r 、i a2 They are the speed ratio of the reducer and the speed ratio of the hydraulic drive axle. is the mechanical efficiency of the whole bridge hydraulic drive system. g2 is the displacement of the wheel drive motor 3, is the pressure difference of the wheel hydraulic motor, i a3 The speed ratio of the left and right wheel reducers of the disconnect axle with independent suspension, is the mechanical efficiency of the wheel drive system.

[0040] In this embodiment, the wheel drive motor 3 is a hydraulic motor, and the power is taken from the chassis engine 8. Figure 5 , the wheel side drive system may include: A transmission 9, which is arranged at the output end of the chassis engine 8 and includes a transmission power take-off device; The hydraulic pump 10 is installed on the transmission power take-off device and connected to the wheel-side drive motor 3 through a hydraulic pipeline.

[0041] exist Figure 5 In the embodiment, when the disconnecting axle assembly 100 uses a hydraulic motor with a larger torque to drive the wheels on both sides, the power source of the wheel-side drive system is the chassis engine 8. The chassis engine 8 is connected to the transmission 9, and the hydraulic pump 10 is installed on the transmission power take-off device, and then connected to the wheel-side drive motor 3 through a hydraulic pipeline. The wheel-side drive motor 3 is installed on the left and right wheel-side reducers of the disconnecting axle. The hydraulic system directly drives the wheel-side reducer, and a coupling and disengagement mechanism can be set on the wheel-side reducer. In this way, the chassis engine 8 drives the hydraulic pump 10, and then pumps pressure oil to the hydraulic motor to complete the hydraulic drive of the wheel-side drive system.

[0042] It should be noted that the principles and structures of the above-mentioned transmission power take-off device, wheel-side reducer and other components are well known to technical personnel in this field, and are not key components of this application, so they will not be elaborated here.

[0043] In particular, the hydraulic pump 10 may be a variable displacement pump, and the wheel-side drive motor 3 may also be a variable displacement motor, so that the wheel-side drive force may be adjusted by adjusting the motor displacement. Therefore, the controller may also be configured as follows: Determine that the all-terrain crane is in a heavy-load driving condition, and the total vehicle weight G is greater than a preset vehicle weight value and the real-time vehicle speed v is less than a preset vehicle speed value; Control and start the whole bridge hydraulic drive system and wheel side drive system.

[0044] In other words, when driving with a heavy load, the mechanical drive system is activated first. When it is greater than the mechanical drive torque T1, the hydraulic drive, especially the wheel drive, can be started as a supplement. For example, when the vehicle is too heavy and the speed is too slow, it is judged that the mechanical drive force is insufficient, and the hydraulic drive can be started. The preset vehicle weight value and the preset vehicle speed value can be set according to the actual situation.

[0045] When the hydraulic pump 10 is a variable displacement pump and the wheel drive motor 3 is a variable displacement motor, the controller may also be configured as follows: Determining that the first integral axle 200 is slipping; Controlling and adjusting the displacement of the hydraulic pump 10 to increase the wheel drive torque T3 that the wheel drive system can provide; Determining that the wheel side axle load distribution of the two side axles of the disconnecting axle assembly 100 is different; According to the ratio of the wheel axle loads on both sides, the motor displacements of the wheel drive motors 3 on both sides are controlled and adjusted.

[0046] In other words, when skidding or turning occurs, by utilizing the feature that the wheel drive motors 3 on both sides of the disconnect axle assembly 100 are driven independently of each other, different driving forces can be applied to the vehicles on both sides to adapt to the driving conditions.

[0047] In summary, for ultra-large all-terrain cranes such as those with nine bridges or more, the vehicle drive control may include: ① When it is detected that the vehicle is in a heavy-load driving state, the total weight G of the vehicle is greater than the set value, and the vehicle speed v is less than the set value, it is judged that the driving force of the mechanical drive system is insufficient, and you can choose to increase the use Figure 6 The 2-bridge full-bridge hydraulic drive system and the 1-bridge wheel-side drive system serve as power supplements to jointly drive the vehicle.

[0048] It can be seen that when the vehicle is heavily loaded and the weight is greater than the preset value and the vehicle speed is less than the preset value, the hydraulic drive system is selected; when the vehicle is heavily loaded, the mechanical drive system is started first. When it is greater than the mechanical drive torque T1, the hydraulic drive, especially the wheel drive, can be started as a supplement.

[0049] ② According to the different heavy-load driving conditions of the vehicle, that is, according to the weight of the vehicle and the road slope, different hydraulic drives are selected. , there is no need to put the whole bridge hydraulic drive into operation; when it is detected ,and , give priority to 8-axle mechanical drive and 2-axle hydraulic drive; when it is detected , and then simultaneously put the 1st bridge wheel side hydraulic drive into operation.

[0050] ③ When some mechanical drive axles are detected to be slipping (which can be confirmed by comparing the slip ratio of each axle with the set value), the displacement of the wheel drive motor 3 is adjusted. , increasing the wheel drive torque.

[0051] When it is detected that the left and right wheel side axle load distributions of the independent suspension disconnect axle assembly 100 are different, for example when the vehicle is turning, the displacements of the left and right hydraulic motors can be adjusted according to the left and right wheel side axle load ratios to maximize the use of ground adhesion to provide wheel side hydraulic drive torque.

[0052] In summary, the present application provides a disconnect axle assembly of an independent suspension and its wheel-side hydraulic auxiliary drive system, which can use a single engine to drive both the mechanical drive axle and the wheel-side hydraulic drive axle. According to the newly designed disconnect axle assembly and its application in the axle drive system of an all-terrain crane, as well as the corresponding control strategy, compared with the prior art, the present application can reduce the height of the entire vehicle, reduce the center of gravity height, improve the anti-rolling ability during driving, make driving safer, increase the wheel-side hydraulic drive force, and improve the power of the entire vehicle. Moreover, the wheel-side hydraulic drive force can be selected according to the driving conditions of the vehicle.

[0053] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A disconnect axle assembly, characterized in that: The disconnectable axle assembly (100) is used to be mounted on a vehicle frame rotary section (1) and comprises: A left axle (21) and a right axle (22) are distributed on both sides of the frame rotating section (1), and the left axle (21) and the right axle (22) are respectively connected to the frame rotating section (1) via respective suspension cylinders (6); The wheel side drive motor (3) is installed in the left vehicle axle (21) and the right vehicle axle (22) and is used to rotationally drive the wheels on both sides.

2. The disconnect axle assembly according to claim 1, characterized in that: The disconnectable axle assembly (100) comprises: A left swing arm (41), the left end of the left swing arm (41) being hinged to the left axle (21); A right swing arm (42), the right end of the right swing arm (42) being hinged to the right axle (22); The frame rotating section (1) is provided with a bottom support (5), and the right end of the left swing arm (41) and the left end of the right swing arm (42) are respectively hinged to two sides of the bottom support (5).

3. The disconnect axle assembly according to claim 2, characterized in that: The left axle (21) and the right axle (22) both comprise a wheel-side steering knuckle (7), the top end of the wheel-side steering knuckle (7) being connected to the bottom end of the suspension cylinder (6), and the bottom end of the wheel-side steering knuckle (7) being hinged to the left swing arm (41) or the right swing arm (42).

4. The disconnect axle assembly according to any one of claims 1 to 3, characterized in that: The wheel side drive motor (3) is a hydraulic motor or an electric motor.

5. An all-terrain crane, characterized in that: The all-terrain crane comprises a disconnect axle assembly (100) according to any one of claims 1 to 3.

6. The all-terrain crane according to claim 5, characterized in that: The all terrain crane comprises: A mechanical drive system comprising a plurality of first integral axles (200) driven by a chassis engine (8); The whole-bridge hydraulic drive system comprises a plurality of second integral vehicle axles (300) driven by the off-vehicle hydraulic system; A wheel drive system, comprising the disconnectable axle assembly (100) driven by the wheel drive motor (3); Wherein, the plurality of the first integral vehicle axles (200), the plurality of the second integral vehicle axles (300) and the disconnectable vehicle axle assembly (100) are all drive axles.

7. The all-terrain crane according to claim 6, characterized in that: The all-terrain crane comprises a single chassis engine (8) and an upper vehicle engine for driving the lower vehicle hydraulic system.

8. The all-terrain crane according to claim 6, characterized in that: The all terrain crane includes a controller configured to: Obtain the total target torque (T) of the vehicle under the current driving condition; Determining that the total target torque (T) of the whole vehicle is less than the mechanical drive torque (T1) that can be provided by the mechanical drive system; Controlling and starting the mechanical drive system; Determine that the total target torque T of the whole vehicle is greater than the mechanical drive torque (T1) that can be provided by the mechanical drive system, and is less than the sum of the mechanical drive torque (T1) and the hydraulic drive torque (T2) that can be provided by the whole bridge hydraulic drive system; Controlling and starting the mechanical drive system and the whole-bridge hydraulic drive system; Determining that the total target torque T of the whole vehicle is greater than the sum of the mechanical drive torque (T1) and the hydraulic drive torque (T2) that can be provided by the whole-bridge hydraulic drive system; Control and start the mechanical drive system, the whole-bridge hydraulic drive system and the wheel-side drive system.

9. The all-terrain crane according to claim 8, characterized in that: The wheel drive motor (3) is a hydraulic motor, and the wheel drive system comprises: A transmission (9), arranged at the output end of the chassis engine (8) and comprising a transmission power take-off device; A hydraulic pump (10) is mounted on the transmission power take-off device and connected to the wheel drive motor (3) via a hydraulic pipeline.

10. The all-terrain crane according to claim 9, characterized in that: The controller is also configured to: Determining that the all-terrain crane is in a heavy-load driving condition, and the total vehicle weight G is greater than a preset vehicle weight value and the real-time vehicle speed v is less than a preset vehicle speed value; Control and start the whole-bridge hydraulic drive system and the wheel-side drive system.

11. The all-terrain crane according to claim 9, characterized in that: The hydraulic pump (10) is a variable displacement pump, the wheel drive motor (3) is a variable displacement motor, and the controller is further configured as follows: Determining that the first integral vehicle axle (200) is slipping; Controlling and adjusting the displacement of the hydraulic pump (10) to increase the wheel drive torque T3 that can be provided by the wheel drive system; Determining that the wheel side axle load distribution of the axles on both sides of the disconnecting axle assembly (100) is different; According to the ratio of the wheel side axle loads on both sides, the motor displacement of the wheel side drive motors (3) on both sides is controlled and adjusted.

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