Drive axle of construction machinery and construction machinery

Abstract

The present application discloses a drive axle of a construction machinery and a construction machinery. The drive axle of the construction machinery includes a bridge housing, a half shaft, and a differential assembly. The first end of the half shaft is configured to be connected to a wheel hub. Both the half shaft and the differential assembly are disposed within the bridge housing. The differential assembly includes a differential, a parking brake device, and a service brake device. The differential is connected to the second end of the half shaft. The parking brake device is configured to apply a braking force to the differential. The service brake device is configured to apply a braking force to the half shaft. The parking brake device is integrated inside the differential assembly. Compared with the existing parking brake scheme and service brake scheme, it will not be polluted by the external environment, reducing the risks of rust corrosion and brake failure. The torque required for the service brake is smaller, the size of the service brake device is also smaller, the structure is simple and compact, and the braking performance is good.

Description

Technical Field

[0001] This application relates to the field of construction machinery, and particularly to a drive axle of construction machinery and construction machinery. Background Art

[0002] Currently, there is only a main reducer in the drive axle of construction machinery. The drive axle has a differential function, and the service brakes are assembled on both wheel ends of the drive axle; the parking brake is generally assembled at the output end of the gearbox or at the two output ends of the drive axle. The external type is greatly affected by the environment. When it is exposed to the air for a long time and in corrosive working conditions such as chemical fertilizers and sulfur, the braking components will rust and corrode, resulting in brake failure and prone to safety accidents. Moreover, the parking brake and the service brake are separately arranged with many components and a complex structure.

[0003] It should be noted here that the statements in this background art section only provide background art related to this application and do not necessarily constitute prior art. Summary of the Invention

[0004] This application provides a drive axle of construction machinery and construction machinery to improve braking performance.

[0005] In a first aspect of this application, a drive axle of construction machinery is provided, including a bridge housing, a half shaft, and a differential assembly. The first end of the half shaft is configured to be connected to a wheel hub. Both the half shaft and the differential assembly are disposed within the bridge housing. The differential assembly includes a differential, a parking brake device, and a service brake device. The differential is connected to the second end of the half shaft. The parking brake device is configured to apply a braking force to the differential. The service brake device is configured to apply a braking force to the half shaft.

[0006] In some embodiments, the parking brake device includes a first moving member and a first brake disc group. The first brake disc group is sleeved outside the differential and connected to the differential, and the surface of the first brake disc group away from the first moving member is a first friction surface. The first moving member is movably disposed relative to the first brake disc group in the axial direction to approach or move away from the first brake disc group. The parking brake device has a parking brake state and a parking brake release state. In the parking brake state, the first moving member moves in a direction approaching the first brake disc group to press the first brake disc group against the bridge housing and cause friction between the first friction surface and the bridge housing to generate a braking force. In the parking brake release state, the first moving member moves in a direction away from the first brake disc group to separate the first friction surface of the first brake disc group from the bridge housing.

[0007] In some embodiments, the first brake disc group includes a first brake pad and a first steel sheet. The first brake pad and the first steel sheet are arranged axially, and one of the first brake pad and the first steel sheet is connected to the inner wall of the axle housing by a spline. The other of the first brake pad and the first steel sheet is connected to the differential by a spline. In the parking brake state, the first moving member pushes the first brake pad and the first steel sheet to axially move the first friction surface to perform parking braking.

[0008] In some embodiments, the axle housing has a protruding portion. The protruding portion is configured to extend from the inner wall of the axle housing towards the half shaft and is located on one side of the first friction surface. In the parking brake state, the first friction surface is pressed against the protruding portion under the action of the first moving member to generate friction.

[0009] In some embodiments, the parking brake device further includes a first elastic member and a first oil passage. The first end of the first elastic member is connected to the axle housing. The second end of the first elastic member is connected to the first moving member. The oil can enter the gap between the first moving member and the axle housing through the first oil passage. In the parking brake state, the first elastic member applies a thrust to the first moving member to move the first moving member towards the first brake disc group. In the state where the parking brake is released, the oil enters the gap through the first oil passage, and the pressure of the oil overcomes the elastic force of the first elastic member to move the first moving member away from the first brake disc group.

[0010] In some embodiments, the first elastic member is a disc spring.

[0011] In some embodiments, the service brake device includes a second moving member and a second brake disc group. The second brake disc group is sleeved outside the half shaft and is connected to the half shaft, and the surface of the second brake disc group away from the second moving member is the second friction surface. The second moving member is movably arranged relative to the second brake disc group in the axial direction to approach or move away from the second brake disc group. The service brake device has a service brake state and a service brake release state. In the service brake state, the second moving member moves towards the second brake disc group to press the second brake disc group against the axle housing and cause the second friction surface to rub against the axle housing to generate braking force. In the service brake release state, the second moving member moves away from the second brake disc group to separate the second friction surface of the second brake disc group from the axle housing.

[0012] In some embodiments, the second brake disc group includes a second brake pad and a second steel sheet. The second brake pad and the second steel sheet are arranged axially, and one of the second brake pad and the second steel sheet is connected to the inner wall of the axle housing by a spline. The other of the second brake pad and the second steel sheet is connected to the half shaft by a spline. In the service brake state, the second moving member pushes the second brake pad and the second steel sheet to axially move the second friction surface to perform service braking.

[0013] In some embodiments, the second brake disc group includes a plurality of second brake pads and a plurality of second steel sheets, and the plurality of second brake pads and the plurality of second steel sheets are alternately arranged in the axial direction.

[0014] In some embodiments, the service brake device further includes a second elastic member and a second oil passage. The first end of the second elastic member is connected to the axle housing. The second end of the second elastic member is connected to the second moving member. The oil can enter the gap between the second moving member and the axle housing through the second oil passage. In the service brake state, the oil enters the gap through the second oil passage, and the pressure of the oil overcomes the elastic force of the second elastic member to move the second moving member in a direction close to the second brake disc group. In the state where the service brake is released, the oil leaves the gap, and the second elastic member generates a force for reverse movement on the second moving member to move the second moving member in a direction away from the second brake disc group.

[0015] In some embodiments, the second elastic member is a disc spring.

[0016] In some embodiments, the differential includes a driving spiral gear shaft. One end of the driving spiral gear shaft away from the differential has a spline to form a first power connection interface. The drive axle further includes a gear shaft. The gear shaft meshes with the driving spiral gear shaft, and one end of the gear shaft has a spline to form a second power connection interface.

[0017] In some embodiments, the first power connection interface is configured to input power to the drive axle or output power from the drive axle; and / or, the second power connection interface is configured to input power to the drive axle or output power from the drive axle.

[0018] In some embodiments, the construction machinery includes a steering system and a steering emergency pump for providing power to the steering system. When the construction machinery breaks down and is towed, the rotation of the half shaft is transmitted to the gear shaft through the differential and output to the steering emergency pump through the second power connection interface. The second aspect of the present application provides a construction machinery including the drive axle of the construction machinery as described above.

[0019] Based on the technical solution provided by this application, the drive axle of construction machinery includes a bridge housing, a half shaft, and a differential assembly. The first end of the half shaft is configured to be connected to a wheel hub. Both the half shaft and the differential assembly are disposed within the bridge housing. The differential assembly includes a differential, a parking brake device, and a service brake device. The differential is connected to the second end of the half shaft. The parking brake device is configured to apply a braking force to the differential. The service brake device is configured to apply a braking force to the half shaft. The parking brake device is integrated inside the differential assembly. Compared with the existing solution of externally placing the parking brake at the input end of the drive axle, it will not be polluted by the external environment, reducing the risks of rust corrosion and brake failure. Compared with the traditional wheel-side service brake, the service brake device is built into the differential assembly and applies a braking force to the half shaft. Therefore, the required braking torque is smaller than that of wheel-side braking, and thus the size of the service brake device is also smaller and the structure is simple. In summary, the drive axle provided by this application has a simple and compact structure, combines the functions of parking brake and service brake, and has good braking performance.

[0020] Other features and advantages of this application will become clear through the following detailed description of the exemplary embodiments of this application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings described herein are used to provide a further understanding of this application, and constitute a part of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0022] Figure 1 is an overall schematic diagram of the drive axle of the construction machinery according to the embodiment of this application.

[0023] Figure 2 is a schematic structural diagram of the parking brake device according to the embodiment of this application.

[0024] Figure 3 is Figure 2 a partial enlarged view of

[0025] Figure 4 is a schematic structural diagram of the service brake device according to the embodiment of this application.

[0026] Figure 5 is Figure 4 a partial enlarged view of

[0027] Figure 6 is Figure 1 a schematic diagram after the first oil passage is filled with oil in

[0028] Figure 7 is Figure 1 a schematic diagram after the second oil passage is filled with oil in

[0029] In the figure:

[0030] 1. Axle housing; 11. First axle housing; 12. Second axle housing; 13. Third axle housing; 2. Half shaft; 3. Differential assembly; 31. Differential; 311. Driving spiral gear shaft; 312. Driven spiral gear shaft; 32. Parking brake device; 321. First moving part; 322. First brake pad; 323. First elastic part; 324. First oil passage; 325. First steel sheet; 33. Service brake device; 331. Second moving part; 332. Second brake pad; 333. Second elastic part; 334. Second oil passage; 335. Second steel sheet; 326. Baffle; 4. Gear shaft; 5. Connecting flange; A. Protruding part; B. Protruding disc. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0032] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways, and corresponding interpretations may be made for the spatial relative descriptions used herein.

[0034] Reference Figure 1 , the present application provides a drive axle for a construction machine, including a bridge housing 1, a half shaft 2, and a differential assembly 3. The first end of the half shaft 2 is configured to be connected to a wheel hub. Both the half shaft 2 and the differential assembly 3 are disposed within the bridge housing 1. The differential assembly 3 includes a differential 31, a parking brake device 32, and a service brake device 33. The differential 31 is connected to the second end of the half shaft 2. The parking brake device 32 is configured to apply a braking force to the differential 31. The service brake device 33 is configured to apply a braking force to the half shaft 2. The parking brake device 32 is integrated inside the differential assembly 3. Compared with the existing solution of externally placing the parking brake at the input end of the drive axle, it will not be polluted by the external environment, reducing the risks of rust corrosion and brake failure. Compared with the traditional in-wheel service brake, the service brake device 33 is built into the differential assembly 3 and applies a braking force to the half shaft 2. Therefore, the required braking torque is smaller than that of the in-wheel brake, and thus the size of the service brake device 33 is also smaller and the structure is simple. In summary, the drive axle provided by the present application has a simple and compact structure, combines the functions of parking brake and service brake, and has good braking performance.

[0035] Reference Figure 2, in some embodiments, the parking brake device 32 includes a first moving member 321 and a first brake disc group. The first brake disc group is sleeved outside the differential 31 and connected to the differential 31, and the surface of the first brake disc group away from the first moving member 321 is a first friction surface. The first moving member 321 is movably arranged relative to the first brake disc group in the axial direction to approach or move away from the first brake disc group. The parking brake device 32 has a parking brake state and a parking brake release state. In the parking brake state, the first moving member 321 moves towards the first brake disc group to press the first brake disc group against the axle housing 1 and cause friction between the first friction surface and the axle housing 1 to generate braking force. In the parking brake release state, the first moving member 321 moves away from the first brake disc group to separate the first friction surface of the first brake disc group from the axle housing 1. The axial direction described in the embodiments herein is parallel to the axis of the half shaft 2. Specifically, by simply controlling the axial movement of the first moving member 321, the presence or absence of the braking force of the parking brake device 32 can be controlled. During braking, due to the frictional force generated by the first friction surface, the first brake disc group and the differential 31 remain relatively stationary.

[0036] Reference Figure 3 , in some embodiments, the first brake disc group includes a first brake pad 322 and a first steel disc 325. The first brake pad 322 and the first steel disc 325 are arranged axially, and one of the first brake pad 322 and the first steel disc 325 is connected to the inner wall of the axle housing 1 through a spline. The other of the first brake pad 322 and the first steel disc 325 is connected to the differential 31 through a spline. In the parking brake state, the first moving member 321 pushes the first brake pad 322 and the first steel disc 325 to axially move the first friction surface for parking braking. For example, the first steel disc 325 is connected to the inner wall of the axle housing 1, the first brake pad 322 is connected to the differential 31, and the first steel disc 325 can only move a small distance axially relative to the first brake pad 322 through the keyway of the spline. The first brake pad 322 can only move a small distance axially relative to the differential 31 through the keyway of the spline. During braking, the first steel disc 325 moves axially to press against the first brake pad 322 and make the first brake pad 322 axially approach the axle housing 1, that is, the first steel disc 325, the first brake pad 322, and the axle housing 1 are closely attached together. The three are relatively stationary and friction is generated between the mating surfaces of the three to limit the continued rotation of the differential 31 to achieve braking. When not braking, the first brake pad 322 rotates together with the differential 31, and the first steel disc 325 does not rotate relative to the differential 31.

[0037] Reference Figure 2, in some embodiments, the axle housing 1 has a protrusion A. The protrusion A is configured to extend from the inner wall of the axle housing 1 towards the half shaft 2 and is located on one side of the first friction surface. In the parking brake state, the first friction surface presses against the protrusion A under the action of the first moving member 321 and generates friction. Specifically, the extending position of the protrusion A is coordinated with the axial moving distance of the first steel sheet 325 and the first brake pad 322, so that under the action of the first moving member 321, the first steel sheet 325 and the first brake pad 322 exactly axially move to fit against the protrusion A to generate friction. During braking, under the action of the first moving member 321, the first steel sheet 325 and the first brake pad 322 axially press against the protrusion A, that is, the first brake pad 322 is stationary relative to the axle housing 1, and further makes the differential 31 stationary relative to the axle housing 1.

[0038] Reference Figure 2 and Figure 3 , in order to enhance the braking effect of the parking brake device 32, in some embodiments, the parking brake device 32 further includes a baffle 326. The baffle 326 is connected to the inner wall of the axle housing 1 by splines. Specifically, the splines on the inner wall of the axle housing 1 have short teeth and long teeth. The keyway depth of the short teeth is shorter than that of the long teeth. The first steel sheet 325 and the first brake pad 322 are spline-connected to the long teeth. The baffle 326 is arranged on the short teeth, and the baffle 326 is blocked by the long teeth and cannot move in the direction towards the first brake pad 322. The baffle 326 is also configured to be adjacent to the protrusion A so that the baffle 326 is blocked by the protrusion A in the direction away from the first brake pad 322, and finally makes the baffle 326 non-axially movable relative to the axle housing 1. During parking braking, under the action of the first moving member 321, the first steel sheet 325 and the first brake pad 322 axially move through the long teeth and press against the baffle 326. Further, one side surface of the baffle 326 is used to contact and rub against the first friction surface, and the area of this side surface is equivalent to the area of the first friction surface to increase the friction area and enhance the frictional force during braking. At least part of the other side of the baffle 326 is recessed to form a concave-convex fit with the protrusion A to enhance the braking effect.

[0039] Reference Figure 2, in some embodiments, the parking brake device 32 further includes a first elastic member 323 and a first oil passage 324. The first end of the first elastic member 323 is connected to the axle housing 1. The second end of the first elastic member 323 is connected to the first moving member 321. The hydraulic fluid can enter the gap between the first moving member 321 and the axle housing 1 through the first oil passage 324. In the parking brake state, the first elastic member 323 applies a thrust to the first moving member 321 to move the first moving member 321 in a direction close to the first brake pad 322. In the state where the parking brake is released, the hydraulic fluid enters the gap through the first oil passage 324, and the pressure of the hydraulic fluid overcomes the elastic force of the first elastic member 323 to move the first moving member 321 in a direction away from the first brake pad 322. Specifically, the hydraulic oil used to flow into the first oil passage 324 for parking braking is connected to the hydraulic oil tank of the construction machinery. When the parking brake device 32 is closed, the hydraulic oil enters the first oil passage 324. When the parking brake device 32 is started, the hydraulic oil leaves the first oil passage 324. In this cycle, the hydraulic oil can complete heat dissipation due to its own flow, realizing the heat dissipation of the parking brake device 32 without additionally arranging a cooling device.

[0040] In some embodiments, the first elastic member 323 is a disc spring. The disc spring is configured to tightly press the first moving member 321 against the first brake disc group when no oil enters the first oil passage 324.

[0041] In some embodiments, the first moving member 321 is a piston.

[0042] Reference Figure 4 , in some embodiments, the service brake device 33 includes a second moving member 331 and a second brake disc group. The second brake disc group is sleeved outside the half shaft 2 and connected to the half shaft 2, and the surface of the second brake disc group far from the second moving member 331 is the second friction surface. The second moving member 331 is movably arranged relative to the second brake disc group in the axial direction to approach or depart from the second brake disc group. The service brake device 33 has a service brake state and a service brake release state. In the service brake state, the second moving member 331 moves in a direction close to the second brake disc group to press the second brake disc group against the axle housing 1 and cause the second friction surface to rub against the axle housing 1 to generate a braking force. In the service brake release state, the second moving member 331 moves in a direction away from the second brake disc group to separate the second friction surface of the second brake disc group from the axle housing 1. Only by controlling the axial movement of the second moving member 331 can the presence or absence of the braking force of the service brake device 33 be controlled. During braking, through the frictional force generated by the second friction surface, the second brake disc group and the half shaft 2 are jointly stopped from rotating.

[0043] Reference Figure 4, in some embodiments, a convex disk B is provided on the half shaft 2, and the second brake disk group is splined to the convex disk B. By providing the convex disk B, the torque of the vehicle braking of the half shaft 2 generated by the friction force on the second friction surface can be increased. Providing the convex disk B also facilitates the interchangeability with the half shafts of other products and improves the applicability of the drive axle.

[0044] Reference Figure 4 and Figure 5 , in some embodiments, the second brake disk group includes a second brake pad 332 and a second steel sheet 335. The second brake pad 332 and the second steel sheet 335 are arranged axially, and one of the second brake pad 332 and the second steel sheet 335 is splined to the inner wall of the axle housing 1. The other of the second brake pad 332 and the second steel sheet 335 is splined to the half shaft 2. In the vehicle braking state, the second moving member 331 presses the second brake pad 332 and the second steel sheet 335 to axially move the second friction surface for vehicle braking. For example, the second steel sheet 335 is connected to the inner wall of the axle housing 1, and the second brake pad 332 is connected to the half shaft 2. The second brake pad 332 and the second steel sheet 335 can move a small distance axially relative to the half shaft 2 only through the key grooves of the spline. During braking, the second brake pad 332 moves axially to press against the second steel sheet 335 and makes the second steel sheet 335 axially press against the axle housing 1. That is, the second steel sheet 335, the second brake pad 332, and the axle housing 1 are closely attached together. The three are relatively stationary and friction is generated between the mating surfaces of the three to limit the continued rotation of the half shaft 2 to achieve braking. When not braking, the second brake pad 332 rotates together with the half shaft 2, and the second steel sheet 335 does not rotate relative to the half shaft.

[0045] In some embodiments, the second brake disk group includes a plurality of second brake pads 332 and a plurality of second steel sheets 335. The plurality of second brake pads 332 and the plurality of second steel sheets 335 are alternately arranged in the axial direction. Specifically, the braking force required for vehicle braking is greater, so providing a plurality of brake pads and steel sheets can increase the friction force and improve the braking effect.

[0046] Reference Figure 4, in some embodiments, the service brake device 33 further includes a second elastic member 333 and a second oil passage 334. The first end of the second elastic member 333 is connected to the axle housing 1. The second end of the second elastic member 333 is connected to the second moving member 331. The oil can enter the gap between the second moving member 331 and the axle housing 1 through the second oil passage 334. In the service brake state, the oil enters the gap through the second oil passage 334, and the pressure of the oil overcomes the elastic force of the second elastic member 333 to move the second moving member 331 in the direction close to the second brake disc group. In the state where the service brake is released, the oil leaves the gap, and the second elastic member 333 generates a force for the second moving member 331 to move in the reverse direction, causing the second moving member 331 to move in the direction away from the second brake disc group. Specifically, the hydraulic oil used to flow into the second oil passage 334 for service braking is connected to the hydraulic oil tank of the construction machinery. When the service brake device 33 is started, the hydraulic oil enters the second oil passage 334, and when the service brake device 33 is closed, the hydraulic oil leaves the second oil passage 334. In this cycle, the hydraulic oil can complete heat dissipation due to its own flow, realizing the heat dissipation of the service brake device 33 without additionally arranging a cooling device.

[0047] In some embodiments, the second elastic member 333 is a disc spring. When no oil enters the second oil passage 334, the disc spring is configured to move the second moving member 331 away from the second brake disc group.

[0048] In some embodiments, the second moving member 331 is a piston.

[0049] Reference Figure 1 , in some embodiments, the axle housing 1 includes a first axle housing 11, a second axle housing 12, and a third axle housing 13 arranged in sequence in the axial direction. The first axle housing 11 is used to cover the differential 31. The third axle housing 13 is used to cover the half shaft 2. The second axle housing 12 is arranged between the first axle housing 11 and the third axle housing 13. There is an installation gap for arranging the parking brake device 32 between the first axle housing 11 and the second axle housing 12 in the axial direction. There is an installation gap for arranging the service brake device 33 between the third axle housing 13 and the second axle housing 12 in the axial direction. Through the two installation gaps, the parking brake device 32 and the service brake device 33 are compactly arranged in the differential assembly 3, and the parking brake device 32 and the service brake device 33 are detachable.

[0050] In some embodiments, the parking brake device 32 is controlled by a handle, and the service brake device 33 is controlled by a pedal. Both the handle and the pedal are arranged in the cab of the construction machinery. As Figure 6 shown, when the engine is started, press the handle to make the first oil passage 324 inlet, forcing the piston of the parking brake device 32 to move away from the first steel sheet 325, and the first brake pad 322 is released from the first steel sheet 325, and the parking braking force disappears; as Figure 7As shown, in the driving state, when vehicle braking is required, the pedal is depressed to allow oil to enter the second oil passage 334. The piston of the parking brake device 33 presses against the second steel sheet 335, and the second steel sheet 335 and the second brake pad 332 are pressed tightly to generate braking force. When the vehicle braking is released, the pedal is released, and the oil leaves the second oil passage 334. The disc spring forces the piston to reset, and the vehicle braking force disappears. After parking, the handle is depressed, the oil leaves the first oil passage 324, and the disc spring forces the piston to reset to generate parking braking force.

[0051] Reference Figure 1 , in some embodiments, the differential 31 includes a driving spiral gear shaft 311. One end of the driving spiral gear shaft 311 away from the differential 31 has a spline to form a first power connection interface. The drive axle further includes a gear shaft 4. The gear shaft 4 meshes with the driving spiral gear shaft 311, and one end of the gear shaft 4 has a spline to form a second power connection interface. Specifically, the differential further has a driven spiral gear 312. The driven spiral gear 312 meshes with the gear on the driving spiral gear shaft 311. The rotation of the driving spiral gear shaft 311 drives the rotation of the driven spiral gear 312, which in turn causes the half shaft 2 to rotate. The half shaft 2 then drives the hub to rotate to achieve the power output at both ends of the drive axle. A connecting flange 5 is further provided at one end of the driving spiral gear shaft 311 away from the differential 31. The first connection interface is used to connect with the transmission shaft of the construction machinery. The connecting flange 5 is used to stabilize the connection relationship between the transmission shaft and the driving spiral gear shaft 311. The transmission shaft transmits power to the driving spiral gear shaft 311, drives the half shaft 2 to rotate, and thus realizes the rotation of the hub. In some embodiments, the second power connection interface is connected to a motor or a pump through a spline, and the motor or the pump can be connected to other working devices according to requirements. When the construction machinery is working normally, the rotation of the driving spiral gear shaft 311 drives the gear shaft 4 to rotate, and then transmits the power to the motor or the pump. The motor and the pump further transmit the power to other working devices.

[0052] In some embodiments, the first power connection interface is configured to input power to the drive axle or output power from the drive axle; and / or, the second power connection interface is configured to input power to the drive axle or output power from the drive axle. The drive axle has multiple working modes through the two power connection interfaces. The first is that the two power connection interfaces jointly serve as power inputs to rotate the half shaft 2; the second is that the first power connection interface alone serves as a power input to rotate the half shaft 2; the third is that the second power connection interface alone serves as a power input to rotate the half shaft 2, and at this time, the transmission ratio between the meshing gears of the gear shaft 4 and the driving helical gear shaft 311 can be adjusted to meet the vehicle transmission coefficient; the fourth is that the first power connection interface alone serves as a power input, and the half shaft 2 and the second connection interface serve as power outputs; the fifth is that the second power connection interface alone serves as a power input, and the half shaft 2 and the first connection interface serve as power outputs. The above are the five power modes of the construction machinery during normal operation. In some embodiments, there is also a sixth working mode. Specifically, the construction machinery includes a steering system and a steering emergency pump for providing power to the steering system. When the construction machinery breaks down and is towed, the rotation of the half shaft 2 is transmitted to the gear shaft 4 through the differential 31 and output to the steering emergency pump through the second power connection interface. The second connection interface serves as an emergency steering power take-off port to provide flow to the steering system to ensure safe steering and guarantee the safety during towing. During the towing of the vehicle, the rotation of the ground tires serves as power and is transmitted back to the second connection interface through the drive axle without an external power source, reducing system energy consumption.

[0053] The present application also provides a construction machinery, including the drive axle of the construction machinery as described above.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present application or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present application, they should all be covered within the scope of the technical solutions claimed in the present application.

Claims

1. A drive axle of a construction machinery, characterized in that, Comprising: Axle housing (1); Half shaft (2), the first end of the half shaft (2) being configured to be connected to a wheel hub; And Differential assembly (3), both the half shaft (2) and the differential assembly (3) being disposed within the axle housing (1), the differential assembly (3) comprising: Differential (31), the differential (31) being connected to the second end of the half shaft (2); Parking brake device (32), disposed adjacent to the differential (31) within the axle housing (1), the parking brake device (32) being connected to the differential (31) and configured to apply a braking force to the differential (31), the parking brake device (32) comprising a first moving member (321) and a first brake disc group, the first brake disc group being sleeved outside the differential (31) and connected to the differential (31), and the surface of the first brake disc group remote from the first moving member (321) being a first friction surface, the first moving member (321) being movably disposed relative to the first brake disc group in the axial direction to approach or move away from the first brake disc group, the parking brake device (32) having a parking brake state and a parking brake release state, in the parking brake state, the first moving member (321) moves in a direction approaching the first brake disc group to press the first brake disc group against the axle housing (1) and cause the first friction surface to frictionally engage with the axle housing (1) to generate a braking force; in the parking brake release state, the first moving member (321) moves in a direction away from the first brake disc group to separate the first friction surface of the first brake disc group from the axle housing (1); and Service brake device (33), configured to apply a braking force to the half shaft (2).

2. The drive axle of the construction machinery according to claim 1, characterized in that, The first brake disc group includes a first brake pad (322) and a first steel sheet (325), the first brake pad (322) and the first steel sheet (325) being arranged axially, and one of the first brake pad (322) and the first steel sheet (325) being connected to the inner wall of the axle housing (1) by a spline, and the other of the first brake pad (322) and the first steel sheet (325) being connected to the differential (31) by a spline, in the parking brake state, the first moving member (321) presses the first brake pad (322) and the first steel sheet (325) to axially move the first friction surface for parking braking.

3. The drive axle of the construction machinery according to claim 1, characterized in that, The axle housing (1) has a protruding portion (A), the protruding portion (A) being configured to extend from the inner wall of the axle housing (1) towards the half shaft (2) and located on one side of the first friction surface, in the parking brake state, the first friction surface presses against the protruding portion (A) under the action of the first moving member (321) and generates friction.

4. The drive axle of the construction machinery according to claim 1, characterized in that The parking brake device (32) further includes a first elastic member (323) and a first oil passage (324). The first end of the first elastic member (323) is connected to the axle housing (1), and the second end of the first elastic member (323) is connected to the first moving member (321). The oil can enter the gap between the first moving member (321) and the axle housing (1) through the first oil passage (324). In the parking brake state, the first elastic member (323) applies a thrust force to the first moving member (321) to move the first moving member (321) in a direction close to the first brake disc group; in the state where the parking brake is released, the oil enters the gap through the first oil passage (324), and the pressure of the oil overcomes the elastic force of the first elastic member (323) to move the first moving member (321) in a direction away from the first brake disc group.

5. The drive axle of the construction machinery according to claim 4, characterized in that, The first elastic member (323) is a disc spring.

6. The drive axle of the construction machinery according to claim 1, characterized in that, The service brake device (33) includes a second moving member (331) and a second brake disc group. The second brake disc group is sleeved outside the half shaft (2) and connected to the half shaft (2). The surface of the second brake disc group away from the second moving member (331) is a second friction surface. The second moving member (331) is movably arranged relative to the second brake disc group in the axial direction to approach or separate from the second brake disc group. The service brake device (33) has a service brake state and a state where the service brake is released. In the service brake state, the second moving member (331) moves in a direction close to the second brake disc group to press the second brake disc group against the axle housing (1) and cause the second friction surface to rub against the axle housing (1) to generate a braking force; in the state where the service brake is released, the second moving member (331) moves in a direction away from the second brake disc group to separate the second friction surface of the second brake disc group from the axle housing (1).

7. The drive axle of the construction machinery according to claim 6, characterized in that, The second brake disc group includes a second brake pad (332) and a second steel sheet (335). The second brake pad (332) and the second steel sheet (335) are arranged axially. One of the second brake pad (332) and the second steel sheet (335) is connected to the inner wall of the axle housing (1) by a spline, and the other of the second brake pad (332) and the second steel sheet (335) is connected to the half shaft (2) by a spline. In the service brake state, the second moving member (331) presses the second brake pad (332) and the second steel sheet (335) to axially move the second friction surface for service braking.

8. The drive axle of the construction machinery according to claim 7, characterized in that, The second brake disc group includes a plurality of the second brake pads (332) and a plurality of the second steel sheets (335). The plurality of the second brake pads (332) and the plurality of the second steel sheets (335) are alternately arranged in the axial direction.

9. The drive axle of the construction machinery according to claim 6, characterized in that, The service brake device (33) further includes a second elastic member (333) and a second oil passage (334). The first end of the second elastic member (333) is connected to the axle housing (1), and the second end of the second elastic member (333) is connected to the second moving member (331). The oil can enter the gap between the second moving member (331) and the axle housing (1) through the second oil passage (334). In the service brake state, the oil enters the gap through the second oil passage (334), and the pressure of the oil overcomes the elastic force of the second elastic member (333) to move the second moving member (331) in the direction close to the second brake disc group; in the state where the service brake is released, the oil leaves the gap, and the second elastic member (333) generates a force for the second moving member (331) to move in the reverse direction, moving the second moving member (331) in the direction away from the second brake disc group.

10. The drive axle of the construction machinery according to claim 9, characterized in that, The second elastic member (333) is a disc spring.

11. The drive axle of the construction machinery according to any one of claims 1 to 10, characterized in that, The differential (31) includes a driving spiral gear shaft (311). One end of the driving spiral gear shaft (311) far from the differential (31) has a spline to form a first power connection interface. The drive axle further includes a gear shaft (4). The gear shaft (4) meshes with the driving spiral gear shaft (311), and one end of the gear shaft (4) has a spline to form a second power connection interface.

12. The drive axle of the construction machinery according to claim 11, characterized in that, The first power connection interface is configured to input power to the drive axle or output power from the drive axle; and / or, the second power connection interface is configured to input power to the drive axle or output power from the drive axle.

13. The drive axle of the construction machinery according to claim 11, characterized in that, The construction machinery includes a steering system and a steering emergency pump for providing power to the steering system. When the construction machinery breaks down and is towed, the rotation of the half shaft (2) is transmitted to the gear shaft (4) through the differential (31) and output to the steering emergency pump through the second power connection interface.

14. An engineering machinery, characterized in that, A drive axle of a construction machinery including the drive axle according to any one of claims 1 to 13.

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