Construction machinery drive systems and pavers

Abstract

The present application relates to the technical field of construction machinery, and provides a construction machinery drive system and a paver. The construction machinery drive system includes: a drive axle; a first drive wheel group, the first drive wheel of the first drive wheel group is connected to the drive axle through a first transmission mechanism; a second drive wheel group, the second drive wheel group is connected to the first drive wheel group through a connection mechanism, and can be lifted and lowered by rotating relative to the first drive wheel group; the second drive wheel of the second drive wheel group is connected to the first transmission mechanism through a second transmission mechanism, and the second transmission mechanism can form a transmission connection or disconnect the transmission connection with the first transmission mechanism. In the technical solution of the present application, different driving modes can be adopted according to different construction scenarios, which can improve the adaptability to different road surfaces, enhance the anti-skid performance, prevent or reduce the impact on the turning performance of the paver, and improve energy utilization efficiency and reduce energy consumption.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to an engineering machinery drive system and a paver. Background Art

[0002] At present, in the field of engineering machinery, pavers are one of the common road construction machinery used for road paving operations. Some pavers use a four-wheel rear drive system, but there is a problem of poor adaptability to uneven road surfaces, and the wheels are prone to slippage, which affects the normal driving of the pavers. In addition, the turning performance of the four-wheel rear drive system is poor, which affects the driving flexibility. The prior art provides a swing-frame rear-wheel drive structure for a paver, in which two rows of drive wheels can swing around the drive axle through a swing frame to improve the adaptability to the road surface. However, the rear drive structure in this scheme is relatively complex, and the front and rear rows of drive wheels move simultaneously during swinging, which has limited effect on improving the road surface adaptability and anti-skid performance, and there are still problems of poor flexibility and high energy consumption. Summary of the invention

[0003] According to the embodiments of the present invention, it is intended to improve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, an object according to an embodiment of the present invention is to provide a construction machinery drive system.

[0005] Another object of an embodiment of the present invention is to provide a paving machine.

[0006] In order to achieve the above-mentioned purpose, according to an embodiment of the first aspect of the present invention, there is provided a construction machinery drive system, comprising: a drive axle; a first drive wheel group, wherein the first drive wheel of the first drive wheel group is transmission-connected to the drive axle via a first transmission mechanism; a second drive wheel group, wherein the second drive wheel group is rotationally connected to the first drive wheel group via a connecting mechanism and can be lifted and lowered by rotating relative to the first drive wheel group; wherein the second drive wheel of the second drive wheel group is connected to the first transmission mechanism via a second transmission mechanism, and the second transmission mechanism can form a transmission connection or disconnect a transmission connection with the first transmission mechanism.

[0007] According to an embodiment of the first aspect of the present invention, the engineering machinery drive system includes a drive axle, a first drive wheel group, a second drive wheel group, a connecting mechanism, a first transmission mechanism and a second transmission mechanism. The drive axle is used to output power; the first drive wheel group and the second drive wheel group are respectively arranged on the rear side and the front side of the drive axle to form two rows of drive wheel groups in front and behind, and each row of drive wheel groups may include two drive wheels to form a four-wheel drive form. The second drive wheel group is connected to the first drive wheel group through a connecting mechanism, so that the second drive wheel group can rotate around the first drive wheel group as the center, thereby realizing the lifting movement of the second drive wheel group, so that the working state of the second drive wheel group is adjusted according to different construction scenes, and the first drive wheel group can be driven alone, or the second drive wheel group and the second drive wheel group can be driven simultaneously.

[0008] The first drive wheel group is provided with a first drive wheel, and is connected to the output end of the drive bridge through a first transmission mechanism to drive the first drive wheel to rotate. The second drive wheel group is provided with a second drive wheel, and is connected to the first transmission mechanism through a second transmission mechanism; the second transmission mechanism can form a transmission connection with the first transmission mechanism to take power through the first transmission mechanism and drive the second drive wheel to rotate; the second transmission mechanism can also be disconnected from the first transmission mechanism, so that when the second drive wheel is in a non-working position (the second drive wheel rises and leaves the ground), there is no need to transmit power to the second drive wheel, which is conducive to improving energy utilization efficiency and reducing energy consumption.

[0009] Taking the application of the engineering machinery drive system in the present scheme to a paver as an example, when the paver is in the paving operation process, the second drive wheel group and the first drive wheel group can work together to increase the adhesion between the tire and the ground, enhance the overall driving force and anti-skid performance, and when encountering uneven road conditions, the contact state between the second drive wheel group and the road surface can be adjusted at any time to prevent slipping; when the paver is in a non-operating process or a transfer process, the second drive wheel group can be raised, and the paver is driven only by the first drive wheel group to enhance driving flexibility and improve turning performance, and there is no need to transmit driving force to the second drive wheel, which is beneficial to improving energy utilization efficiency and reducing energy consumption.

[0010] The engineering machinery drive system in this solution can be used for a variety of engineering machinery such as pavers. Different driving modes can be adopted according to different construction scenes, which can effectively improve the adaptability to different road surfaces and prevent slipping. At the same time, the driving flexibility of the engineering machinery is higher, which can prevent the impact on the turning performance. In addition, the use of an adjustable second transmission mechanism is conducive to improving energy utilization efficiency and reducing energy consumption.

[0011] In addition, the engineering machinery drive system in the above technical solution provided in the embodiment of the present invention may also have the following additional technical features:

[0012] In the above technical solution, the second driving wheel set further includes: a lifting mechanism connected to the connecting mechanism, which is used to drive the connecting mechanism to rotate relative to the first driving wheel set so that the second driving wheel performs a lifting movement.

[0013] In this technical solution, a lifting mechanism connected to the connecting mechanism is provided, so that the connecting mechanism is driven by the lifting mechanism to rotate relative to the first driving wheel group, thereby driving the second driving wheel to move up and down in the height direction, thereby adjusting the driving mode. When assembled on an engineering machine, the lifting mechanism can be connected to the frame of the engineering machine to fix the lifting mechanism.

[0014] In the above technical solution, the first driving wheel group includes two first driving wheels, which are respectively arranged at the two ends of the driving axle; the second driving wheel group includes two second driving wheels, which are respectively arranged at the front sides of the two first driving wheels, and a connecting mechanism is provided on the inner side of each second driving wheel; the lifting mechanism includes two lifting cylinders, which are respectively arranged corresponding to the connecting mechanisms on both sides, and one end of the lifting cylinder is rotatably connected to the connecting mechanism, and the other end extends upward from the connecting mechanism for connecting to the frame of the engineering machinery.

[0015] In this technical solution, the first drive wheel group includes two first drive wheels, and correspondingly, the second drive wheel group includes two second drive wheels. The two first drive wheels and the two second drive wheels are respectively arranged corresponding to the two ends of the drive axle, so as to be transmission-connected with the drive axle; the first drive wheel and the second drive wheel on the same side are both rotationally connected with the same connecting mechanism to realize the rotational connection between the second drive wheel and the first drive wheel. A lifting cylinder is respectively arranged corresponding to the connecting mechanisms on both sides, and one end of the lifting cylinder is rotationally connected with the connecting mechanism, and the other end is rotationally connected with the frame above the connecting mechanism, so that the connecting mechanism is driven to rotate around the first drive wheel through the telescopic movement of the lifting cylinder, thereby driving the second drive wheel to perform lifting and lowering movement in the height direction.

[0016] In the above technical solution, each connecting mechanism is provided with at least one first limiting hole, which is used to cooperate with the limiting structure on the frame to limit the rotation of the connecting mechanism through the relative movement between the limiting structure and the first limiting hole; wherein the first limiting hole is arranged along the circumferential direction with the rotating shaft of the first driving wheel as the center.

[0017] In this technical solution, a first limiting hole is provided on the connection mechanism, so that when it is assembled on the engineering machinery, it cooperates with the limiting structure on the frame, and the limiting structure extending into the first limiting hole limits the rotation of the connection mechanism, so that the lifting stroke of the second drive wheel is limited to a suitable range. The first limiting hole can be a waist-shaped hole, and the extension direction of the first limiting hole is adapted to the rotation arc of the connection mechanism, that is, it is arranged along the circumferential direction with the rotating shaft of the first drive wheel as the center; the number of the first limiting holes can be one or more, and when multiple first limiting holes are provided, the multiple first limiting holes are arranged at intervals along the circumferential direction.

[0018] In the above technical solution, the first transmission mechanism includes two first sprocket mechanisms, each of which includes a first driving wheel, a first driven wheel, a first transmission chain and a first drive shaft, the first driving wheel is connected to the output end of the drive bridge, and the first driven wheel is connected to the first drive wheel through the first drive shaft; the second transmission mechanism includes two second sprocket mechanisms, each of which includes a second driving wheel, a second driven wheel, a second transmission chain, a second drive shaft and a clutch, the second driven wheel is connected to the second drive wheel through the second drive shaft, and the clutch is arranged between the second driving wheel and the first drive shaft, and is used to form a transmission connection or disconnect the transmission connection between the second driving wheel and the first drive shaft.

[0019] In this technical solution, the first transmission mechanism includes two first sprocket mechanisms, and the second transmission mechanism includes two second sprocket mechanisms. Specifically, the two first sprocket mechanisms are respectively arranged corresponding to the two first drive wheels, and each first sprocket mechanism includes a first driving wheel, a first driven wheel, a first transmission chain and a first drive shaft; the first transmission chain is meshed with the first driving wheel and the first driven wheel to realize chain transmission; the first driving wheel is connected to the output end of the drive bridge, and the first driven wheel is connected to the first drive wheel through the first drive shaft. When the drive bridge is working, power is transmitted to the first drive wheel through the first driving wheel, the first transmission chain, the first driven wheel and the first drive shaft, so that the first drive wheel rotates, thereby driving the engineering machinery to travel.

[0020] Similarly, two second sprocket mechanisms are respectively arranged corresponding to the two second drive wheels, and each second sprocket mechanism includes a second driving wheel, a second driven wheel, a second transmission chain, a second drive shaft and a clutch. The second transmission chain meshes with the second driving wheel and the second driven wheel to realize chain transmission; the second driven wheel is connected to the second driving wheel through the second drive shaft, the second driving wheel is connected to the first drive shaft, and a clutch is provided between the second driving wheel and the first drive shaft, and the transmission relationship between the second driving wheel and the first drive shaft can be adjusted by connection or separation. When the second driving wheel works with the first driving wheel, the second driving wheel is connected to the first drive shaft through the clutch, and then the power is transmitted to the second driving wheel through the second driving wheel, the second transmission chain, the second driven wheel and the second drive shaft, so that the second driving wheel rotates. When the second driving wheel rises and leaves the ground under the action of the lifting cylinder, the clutch can be separated to disconnect the second driving wheel from the transmission connection with the first drive shaft, thereby stopping the transmission of power to the second driving wheel.

[0021] In the above technical solution, the engineering machinery drive system also includes: a controller, which is electrically connected to the lifting mechanism and the clutch, and is used to control the operation of the lifting mechanism and the clutch to disconnect the transmission connection between the second driving wheel and the first driving shaft after the second driving wheel leaves the ground.

[0022] In this technical solution, a controller electrically connected to the lifting mechanism and the clutch is provided to control the lifting mechanism and the clutch, so that according to the working scene and construction requirements of the engineering machinery, the lifting mechanism is controlled to drive the second drive wheel to rise or fall, and the clutch is controlled to perform corresponding actions, so that the second transmission mechanism and the first transmission mechanism are connected in transmission when the second drive wheel is in a working state, and the second transmission mechanism is disconnected from the first transmission mechanism when the second drive wheel is in a non-working state, so as to reduce energy consumption.

[0023] In the above technical solution, the engineering machinery drive system also includes: a detector, which is arranged corresponding to the second drive wheel and is used to detect whether the second drive wheel is in a slipping state; wherein the controller is electrically connected to the detector to control the operation of the lifting mechanism according to the detection result of the detector.

[0024] In this technical solution, a detector is provided to detect whether the second drive wheel is in a slipping state, and the detector is electrically connected to the controller, so that the controller can directly control the lifting mechanism to adjust the second drive wheel when the second drive wheel slips, so as to increase the adhesion between the second drive wheel and the ground, improve the anti-slip performance, and reduce the impact on the normal operation of the construction machinery.

[0025] In the above technical solution, the first transmission mechanism also includes a first tensioner, which cooperates with the first transmission chain and is used to adjust the tension state of the first transmission chain; the second transmission mechanism also includes a second tensioner, which cooperates with the second transmission chain and is used to adjust the tension state of the second transmission chain.

[0026] In this technical solution, a first tensioner matched with the first transmission chain is provided in the first transmission mechanism to adjust the tension state of the first transmission chain, so that the first transmission chain is kept in a suitable tension state, and the first transmission chain is prevented from being too loose or too tight to affect normal transmission. Similarly, a second tensioner matched with the second transmission chain is provided in the second transmission mechanism to adjust the tension state of the second transmission chain, so that the second transmission chain is kept in a suitable tension state. When assembled in engineering machinery, the first tensioner and the second tensioner can be respectively installed at corresponding positions on the frame for easy fixation.

[0027] In the above technical solution, the second tensioner includes: a mounting seat, which is arranged corresponding to the first transmission chain and has a second limiting hole on the mounting seat; a tensioning wheel, which cooperates with the first transmission chain and has a limiting slider on one side of the tensioning wheel, and the limiting slider extends into the second limiting hole; a tensioning cylinder, one end of which is connected to the mounting seat and the other end is connected to the tensioning wheel, and is used to drive the tensioning wheel to slide along the extension direction of the second limiting hole to adjust the tensioning state of the first transmission chain.

[0028] In this technical solution, the second tensioner includes a mounting seat, a tensioning wheel and a tensioning cylinder. The mounting seat is fixedly connected to the frame and is arranged at a position corresponding to the first transmission chain; the two ends of the tensioning cylinder are respectively connected to the mounting seat and the tensioning wheel, and the tensioning wheel cooperates with the first transmission chain to adjust the position of the tensioning wheel through the telescopic movement of the tensioning cylinder, thereby changing the magnitude of the tensioning force, and adjusting the tensioning state of the first transmission chain without manual adjustment, which is convenient and quick. Among them, a second limiting hole is provided on the mounting seat, and a limiting slider is provided on the side of the tensioning wheel corresponding to the mounting seat. The limiting slider extends into the second limiting hole and can slide along the extension direction of the second limiting hole under the drive of the tensioning cylinder, thereby limiting the tensioning wheel.

[0029] Furthermore, the engineering machinery drive system also includes a tire pressure detection component, including a plurality of tire pressure sensors, which are respectively arranged on two second drive wheels, and are used to detect the tire pressure of the second drive wheels; wherein, the controller is electrically connected to the tire pressure sensor, and when the second drive wheel and the first drive wheel are working at the same time, the controller controls the lifting mechanism to work according to the tire pressure of the second drive wheel to drive the second drive wheel to rise or fall, so that the tire pressure of the second drive wheel meets the operating requirements to prevent slipping.

[0030] The controller determines the current tire pressure condition based on the detection results of the tire pressure sensor. When the tire pressure is less than the first tire pressure threshold, the controller controls the lifting mechanism to drive the second drive wheel to descend. When the tire pressure is greater than the second tire pressure threshold, the controller controls the lifting mechanism to drive the second drive wheel to rise. When the tire pressure is greater than or equal to the first tire pressure threshold and less than or equal to the second tire pressure threshold, the controller controls the lifting mechanism to maintain the current state. It can be understood that if the tire pressure of the second drive wheel is less than the first tire pressure threshold, it indicates that the current tire pressure is insufficient and the second drive wheel may slip during the operation. At this time, the controller controls the lifting cylinder to extend and drive the second drive wheel to descend to increase the pressure between the second drive wheel and the ground and increase the tire pressure of the second drive wheel to meet the operation requirements; if the tire pressure of the second drive wheel is greater than the second tire pressure threshold, it indicates that the tire pressure of the second drive wheel is too high, which is not conducive to normal construction. At this time, the lifting mechanism is controlled to drive the second drive wheel to rise to reduce the tire pressure of the second drive wheel; when the second drive wheel is between the first tire pressure threshold and the second tire pressure threshold, it indicates that the tire pressure reaches the tire pressure range required by the operation. At this time, there is no need to change the height of the second drive wheel. The lifting mechanism is controlled to maintain the current state so that the second drive wheel operates under the current tire pressure state. Among them, the first tire pressure threshold is less than the second tire pressure threshold, and the specific value can be set according to the tire model of the second drive wheel and the specific construction requirements.

[0031] Furthermore, a tire pressure sensor is also provided on the first drive wheel to detect the tire pressure of the first drive wheel, so that the operator can timely know the tire pressure status of the first drive wheel and make timely adjustments when the tire pressure of the first drive wheel exceeds the normal tire pressure range.

[0032] An embodiment of the second aspect of the present invention provides a paver, comprising: a paver body, the paver body being provided with a frame; an engineering machinery drive system according to any one of the embodiments of the first aspect above, wherein a drive axle of the engineering machinery drive system is connected to the paver body, and a first drive wheel group of the engineering machinery drive system is located on the rear side of the drive axle, and a second drive wheel group is located on the front side of the drive axle.

[0033] According to an embodiment of the second aspect of the present invention, a paver includes a paver body and an engineering machinery drive system according to any one of the embodiments of the first aspect. The paver body serves as the main body of the paver, and the movement of the paver body drives the working device (such as an ironing plate, a hopper, etc.) to achieve paving operations. The drive axle of the engineering machinery drive system is fixedly connected to the paver body and extends in the lateral direction of the paver body, with both ends being output ends. The first drive wheel group and the second drive wheel group of the engineering machinery drive system are arranged below the drive axle, and the second drive wheel group is located in front of the first drive wheel group.

[0034] The first drive wheel group is connected to the output end of the drive bridge through the first transmission mechanism, and the second drive wheel group is connected to the first drive wheel group through the connecting mechanism, and can rotate around the first drive wheel group to realize the lifting movement of the second drive wheel group, so as to adjust the driving mode (such as the first drive wheel group is driven alone or the first drive wheel group and the second drive wheel group are driven at the same time); the second drive wheel of the second drive wheel group is connected to the first transmission mechanism through the second transmission mechanism, and the second transmission mechanism can form a transmission connection or disconnect the transmission connection with the first transmission mechanism to adapt to the working state of the second drive wheel.

[0035] The paver in this solution can adopt different driving modes according to different working scenarios and construction requirements, which can effectively improve the adaptability to different road surfaces, enhance the anti-skid performance and prevent slipping. At the same time, the paver has higher driving flexibility and can prevent the impact on the turning performance. In addition, the transmission relationship of the second drive wheel can be adjusted according to the different working conditions of the second drive wheel, which is conducive to saving energy and reducing energy consumption.

[0036] In addition, the paver in this solution also has all the beneficial effects of the engineering machinery drive system in the embodiment of the first aspect mentioned above, which will not be repeated here.

[0037] Additional aspects and advantages of embodiments of the present invention will become apparent in the following description or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the embodiments of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 A schematic diagram showing a partial structure of a construction machinery drive system according to an embodiment of the present invention;

[0040] Figure 2 A schematic diagram showing a partial structure of a construction machinery drive system according to an embodiment of the present invention;

[0041] Figure 3 A schematic diagram showing a partial structure of a paver according to an embodiment of the present invention;

[0042] Figure 4 A top view showing a partial structure of a paving machine according to an embodiment of the present invention;

[0043] Figure 5 A top view showing a partial structure of a paving machine according to an embodiment of the present invention;

[0044] Figure 6A schematic diagram showing a connection mechanism according to an embodiment of the present invention is shown;

[0045] Figure 7 shows a top view of a connection mechanism according to an embodiment of the present invention;

[0046] Figure 8 A schematic diagram showing a partial structure of a construction machinery drive system according to an embodiment of the present invention;

[0047] Fig. 9 A schematic diagram showing a partial structure of a construction machinery drive system according to an embodiment of the present invention;

[0048] Fig.10 A schematic diagram showing a partial structure of a construction machinery drive system according to an embodiment of the present invention;

[0049] Fig.11 A schematic block diagram showing the electrical connection relationship of a controller according to an embodiment of the present invention is shown;

[0050] Fig.12 A schematic block diagram showing the electrical connection relationship of a controller according to an embodiment of the present invention is shown;

[0051] Fig.13 A schematic block diagram showing the electrical connection relationship of a controller according to an embodiment of the present invention is shown;

[0052] Fig.14 A schematic diagram of a second tensioner according to an embodiment of the present invention is shown;

[0053] Fig.15 A schematic diagram of a second tensioner according to an embodiment of the present invention is shown;

[0054] Fig.16 A schematic diagram of a second tensioner according to an embodiment of the present invention is shown;

[0055] Fig.17 A flow chart showing the control logic of the lifting mechanism according to an embodiment of the present invention is shown.

[0056] in, Figures 1 to 16 The corresponding relationship between the reference numerals and component names is as follows:

[0057] 1 engineering machinery drive system, 10 driving axle, 11 first driving wheel set, 111 first driving wheel, 12 first transmission mechanism, 121 first sprocket mechanism, 1211 first driving wheel, 1212 first driven wheel, 1213 first transmission chain, 1214 first driving shaft, 122 first tensioner, 13 second driving wheel set, 131 second driving wheel, 132 lifting mechanism, 1321 lifting cylinder, 14 second transmission mechanism, 141 second sprocket mechanism, 1411 second driving wheel wheel, 1412 second driven wheel, 1413 second transmission chain, 1414 second drive shaft, 1415 clutch, 142 second tensioner, 1421 mounting seat, 1422 tensioning cylinder, 1423 tensioning wheel, 1424 second limiting hole, 1425 limiting slider, 15 connecting mechanism, 151 first limiting hole, 152 first shaft hole, 153 second shaft hole, 16 controller, 17 detector, 18 tire pressure sensor, 2 paver, 21 paver body, 211 frame. DETAILED DESCRIPTION

[0058] In order to more clearly understand the above-mentioned purposes, features and advantages in the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0059] In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the present invention. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0060] Refer to the following Figures 1 to 17 The following describes a construction machinery drive system and a paving machine according to some embodiments of the present invention.

[0061] It should be noted that the engineering machinery drive system of the present invention can be used for various engineering machinery such as pavers. The following embodiments 1 to 8 use pavers as application scenarios to describe the engineering machinery drive systems of some embodiments of the present invention.

[0062] Embodiment 1

[0063] This embodiment provides a construction machinery driving system 1, such as Figure 1 , Figure 2 and Figure 3 As shown, the engineering machinery driving system 1 includes a driving axle 10 , a first driving wheel set 11 , a second driving wheel set 13 , a connecting mechanism 15 , a first transmission mechanism 12 and a second transmission mechanism 14 .

[0064] The driving axle 10 is arranged on the paving machine body 21, and can output power outward under the action of the driving device of the paving machine body 21; the first driving wheel group 11 is arranged on the rear side of the driving axle 10, and the second driving wheel group 13 is arranged on the front side of the driving axle 10 to form two rows of driving wheel groups in front and behind; the first driving wheel group 11 is provided with two first driving wheels 111, and the second driving wheel group 13 is provided with two second driving wheels 131 to form a four-wheel drive form.

[0065] The second driving wheel set 13 is rotatably connected to the first driving wheel set 11 through the connecting mechanism 15. The second driving wheel set 13 can be driven by the connecting mechanism 15 to rotate around the rotating shaft of the first driving wheel set 11 to achieve the lifting movement of the second driving wheel set 13. According to different construction scenarios of the paving machine 2, the first driving wheel set 11 can be driven alone, or the second driving wheel set 13 and the second driving wheel set 13 can be driven simultaneously.

[0066] The first drive wheel 111 is connected to the output end of the drive axle 10 through the first transmission mechanism 12, and the second drive wheel 131 is connected to the first transmission mechanism 12 through the second transmission mechanism 14. The second transmission mechanism 14 can be connected to the first transmission mechanism 12 to take power through the first transmission mechanism 12 and drive the second drive wheel 131 to rotate. The second transmission mechanism 14 can also be disconnected from the first transmission mechanism 12, so that when the second drive wheel 131 is in a non-working position (the state in which the second drive wheel 131 rises and leaves the ground), only the first transmission mechanism 12 works, and the second transmission mechanism 14 does not need to transmit power to the second drive wheel 131, so as to reduce energy consumption.

[0067] For example, when the paver 2 is in the process of paving, the adhesion between the driving wheel and the ground is required to be high. At this time, the second driving wheel 131 and the first driving wheel 111 can work together to increase the adhesion between the tire and the ground, enhance the overall driving force and anti-skid performance; when encountering uneven road conditions, the second driving wheel 131 can also be raised and lowered at any time to adjust the contact state between the second driving wheel 131 and the road surface to prevent slipping. When the paver 2 is in the non-operating process or the transfer process, the paver 2 does not require high driving force. At this time, the second driving wheel 131 can be raised, and the paver 2 can be driven only by the first driving wheel 111 to improve driving flexibility and improve turning performance. There is no need to transmit driving force to the second driving wheel 131, and the second transmission mechanism 14 can be disconnected from the first transmission mechanism 12.

[0068] The construction machinery drive system 1 in this embodiment can adopt different driving modes according to different construction scenes, which can effectively improve the adaptability to different road surfaces and prevent slipping. At the same time, the paver 2 has higher driving flexibility, which can prevent or reduce the impact on turning performance; in addition, the use of an adjustable second transmission mechanism 14 is conducive to improving energy utilization efficiency and reducing energy consumption.

[0069] Embodiment 2

[0070] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the first embodiment.

[0071] like Figures 1 to 3 As shown, the second driving wheel group 13 also includes a lifting mechanism 132, which is arranged corresponding to the connecting mechanism 15 and connected to the connecting mechanism 15, so that the connecting mechanism 15 is driven to rotate relative to the first driving wheel group 11 through the lifting mechanism 132, thereby driving the second driving wheel 131 to move up and down in the height direction, thereby realizing the adjustment of the driving mode.

[0072] When assembled on the paving machine body 21 , the lifting mechanism 132 can be connected to the frame 211 of the paving machine body 21 to achieve the fixation of the lifting mechanism 132 .

[0073] Embodiment 3

[0074] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the second embodiment.

[0075] like Figure 1 , Figure 4 and Figure 5 As shown, the two first drive wheels 111 and the two second drive wheels 131 are respectively arranged corresponding to the two ends of the drive bridge 10, so as to be transmission-connected with the drive bridge 10; a connecting mechanism 15 is provided on the inner side of each second drive wheel 131, and the first drive wheel 111 and the second drive wheel 131 located on the same side are rotationally connected to the same connecting mechanism 15, so that a rotational connection is formed between the second drive wheel 131 and the first drive wheel 111.

[0076] The lifting mechanism 132 includes two lifting cylinders 1321, which are respectively arranged corresponding to the connecting mechanisms 15 on both sides. One end of the lifting cylinder 1321 is rotatably connected to the connecting mechanism 15, and the other end is rotatably connected to the frame 211 above the connecting mechanism 15. Through the telescopic movement of the lifting cylinder 1321, the connecting mechanism 15 can be rotated around the first driving wheel 111. When the lifting cylinder 1321 is retracted, the connecting mechanism 15 rotates upward to drive the second driving wheel 131 to rise. When the lifting cylinder 1321 is extended, the connecting mechanism 15 rotates downward to drive the second driving wheel 131 to descend, thereby realizing the lifting and lowering movement of the second driving wheel 131 in the height direction.

[0077] Embodiment 4

[0078] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the third embodiment.

[0079] like Figure 5 , Figure 6 and Figure 7 As shown, the connection mechanism 15 is provided with a first limiting hole 151 to cooperate with the limiting structure on the frame 211 when assembled on the paving machine body 21. Specifically, the first limiting hole 151 is a waist-shaped hole, and there are two of them; the connection mechanism 15 is also provided with a first shaft hole 152 and a second shaft hole 153, which are used to connect the first driving wheel 111 and the second driving wheel 131 respectively; the extension direction of each waist-shaped hole is adapted to the rotation arc of the connection mechanism 15, and the two waist-shaped holes are arranged at intervals in the circumferential direction with the first shaft hole 152 as the center.

[0080] A limiting structure corresponding to the first limiting hole 151 is provided on the frame 211 and extends into the first limiting hole 151. When the connecting mechanism 15 is driven by the lifting cylinder 1321 to rotate, the position of the first limiting hole 151 changes relative to the limiting structure. When the limiting structure abuts against the end wall of the first limiting hole 151, the connecting mechanism 15 is limited so that the lifting stroke of the connecting mechanism 15 is limited within a suitable range.

[0081] It should be noted that the first limiting holes 151 may also be of other shapes, and the number may also be one or other number greater than two.

[0082] Embodiment 5

[0083] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the third embodiment.

[0084] like Figure 5 , Figure 8 and Fig. 9As shown, the first transmission mechanism 12 includes two first sprocket mechanisms 121 , and the second transmission mechanism 14 includes two second sprocket mechanisms 141 .

[0085] Specifically, the two first sprocket mechanisms 121 are respectively arranged corresponding to the two first driving wheels 111, and each first sprocket mechanism 121 includes a first driving wheel 1211, a first driven wheel 1212, a first transmission chain 1213 and a first driving shaft 1214; the first transmission chain 1213 is meshed with the first driving wheel 1211 and the first driven wheel 1212, the first driving wheel 1211 is connected to the output end of the driving bridge 10, and the first driven wheel 1212 is connected to the first driving wheel 111 through the first driving shaft 1214, so as to realize the transmission connection between the driving bridge 10 and the first driving wheel 111. When the driving bridge 10 is working, the driving bridge 10 transmits power to the first driving wheel 111 through the first driving wheel 1211, the first transmission chain 1213, the first driven wheel 1212 and the first driving shaft 1214, so that the first driving wheel 111 rotates, thereby driving the paving machine body 21 to travel.

[0086] like Fig. 9 and Fig.10 As shown, two second sprocket mechanisms 141 are respectively arranged corresponding to the two second driving wheels 131, and each second sprocket mechanism 141 includes a second driving wheel 1411, a second driven wheel 1412, a second transmission chain 1413, a second driving shaft 1414 and a clutch 1415. The second transmission chain 1413 is meshed with the second driving wheel 1411 and the second driven wheel 1412, the second driven wheel 1412 is connected to the second driving wheel 131 through the second driving shaft 1414, and the second driving wheel 1411 is connected to the first driving shaft 1214; a clutch 1415 is arranged between the second driving wheel 1411 and the first driving shaft 1214, and the clutch 1415 adjusts the transmission relationship between the second driving wheel 1411 and the first driving shaft 1214 through connection or separation operation.

[0087] When the second driving wheel 131 works together with the first driving wheel 111, the clutch 1415 enables the second driving wheel 1411 to form a transmission connection with the first driving shaft 1214, and then transmits power to the second driving wheel 131 through the second driving wheel 1411, the second transmission chain 1413, the second driven wheel 1412 and the second driving shaft 1414, so that the second driving wheel 131 rotates. When the second driving wheel 131 rises and leaves the ground under the action of the lifting cylinder 1321, the clutch 1415 can be disengaged to disconnect the second driving wheel 1411 from the first driving shaft 1214, thereby stopping the transmission of power to the second driving wheel 131.

[0088] Embodiment 6

[0089] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the second embodiment.

[0090] like Figures 9 to 11 As shown, the engineering machinery drive system 1 is further provided with a controller 16, which is electrically connected to the lifting mechanism 132 and the clutch 1415, and is used to control the lifting mechanism 132 and the clutch 1415. The controller 16 can control the lifting mechanism 132 to drive the second drive wheel 131 to rise or fall according to the working scene and construction requirements of the paver 2, and control the clutch 1415 to perform corresponding actions, so that the second transmission mechanism 14 is in a transmission connection with the first transmission mechanism 12 when the second drive wheel 131 is in a working state, and the second transmission mechanism 14 is disconnected from the first transmission mechanism 12 when the second drive wheel 131 is in a non-working state, so as to reduce energy consumption.

[0091] Furthermore, if Fig.12 As shown, the engineering machinery driving system 1 is further provided with a detector 17, and the detector 17 is electrically connected to the controller 16; the detector 17 can detect whether the second driving wheel 131 is in a slipping state, and can send the detection result to the controller 16. According to the detection result of the detector 17, the controller 16 can directly control the lifting mechanism 132 to adjust the second driving wheel 131 when the second driving wheel 131 slips, so that the second driving wheel 131 descends, increases the adhesion between the second driving wheel 131 and the ground, improves the anti-skid performance, and reduces the impact of slipping on the normal operation of the paver 2.

[0092] Embodiment 7

[0093] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the sixth embodiment.

[0094] like Figure 8 and Fig.13 As shown, the engineering machinery drive system 1 also includes a tire pressure detection component, including a plurality of tire pressure sensors 18, which are respectively arranged on the two second drive wheels 131, and are used to detect the tire pressure of the second drive wheels 131; wherein the controller 16 is electrically connected to the tire pressure sensor 18, and when the second drive wheel 131 and the first drive wheel 111 are working at the same time, the controller 16 controls the lifting mechanism 132 to work according to the tire pressure of the second drive wheel, so as to drive the second drive wheel 131 to rise or fall, so that the tire pressure of the second drive wheel 131 meets the operating requirements to prevent slipping.

[0095] like Fig.17As shown, the controller 16 determines the current tire pressure condition according to the detection result of the tire pressure sensor 18. When the tire pressure is less than the first tire pressure threshold, the controller 16 controls the lifting cylinder 1321 to drive the second drive wheel to descend. When the tire pressure is greater than the second tire pressure threshold, the controller 16 controls the lifting cylinder 1321 to drive the second drive wheel to rise. When the tire pressure is greater than or equal to the first tire pressure threshold and less than or equal to the second tire pressure threshold, the controller 16 controls the lifting cylinder 1321 to maintain the current state. Among them, the first tire pressure threshold is less than the second tire pressure threshold, and the specific value can be set according to the tire model of the second drive wheel 131 and the specific construction requirements.

[0096] Furthermore, if Figure 8 As shown, a tire pressure sensor 18 is also provided on the first driving wheel 111 to detect the tire pressure of the first driving wheel 111, so that the operator can timely know the tire pressure status of the first driving wheel 111 and make timely adjustments when the tire pressure of the first driving wheel 111 exceeds the normal tire pressure range.

[0097] Embodiment 8

[0098] This embodiment provides a construction machinery driving system 1, which is further improved on the basis of the second embodiment.

[0099] like Figures 8 to 10 As shown, the first transmission mechanism 12 is further provided with a first tensioner 122 matched with the first transmission chain 1213, and the second transmission mechanism 14 is further provided with a second tensioner 142 matched with the second transmission chain 1413, so as to adjust the tension state of the first transmission chain 1213 and the second transmission chain 1413 respectively, so as to keep the first transmission chain 1213 and the second transmission chain 1413 in a suitable tension state, and prevent the transmission chain from being too loose or too tight to affect normal transmission. When assembled on the paving machine body 21, the first tensioner 122 and the second tensioner 142 can be respectively installed at corresponding positions on the frame 211 for easy fixation.

[0100] Furthermore, if Fig.14 , Fig.15 and Fig.16 As shown, the second tensioner 142 is a hydraulic tensioner, including a mounting seat 1421, a tensioning wheel 1423 and a tensioning oil cylinder 1422. The mounting seat 1421 is fixedly connected to the frame 211 and is arranged at a position corresponding to the first transmission chain 1213; the two ends of the tensioning oil cylinder 1422 are respectively connected to the mounting seat 1421 and the tensioning wheel 1423, and the tensioning wheel 1423 cooperates with the first transmission chain 1213 to adjust the position of the tensioning wheel 1423 through the telescopic movement of the tensioning oil cylinder 1422, thereby changing the size of the tensioning force, and realizing the adjustment of the tensioning state of the first transmission chain 1213, without manual adjustment, which is convenient and quick.

[0101] Among them, a second limiting hole 1424 is provided on the mounting seat 1421, and a limiting slider 1425 is provided on the side of the tensioning wheel 1423 corresponding to the mounting seat 1421. The limiting slider 1425 extends into the second limiting hole 1424 and can slide along the extension direction of the second limiting hole 1424 under the drive of the tensioning cylinder 1422, thereby limiting the tensioning wheel 1423.

[0102] Further, the first tensioner 122 may be Figure 8 The mechanical tensioner shown can of course also be a hydraulic tensioner.

[0103] A specific embodiment of the above-mentioned engineering machinery drive system 1 is provided below:

[0104] In this embodiment, a construction machinery drive system 1 is provided, including a drive axle 10, a first drive wheel set 11, a second drive wheel set 13, a connecting mechanism 15, a first transmission mechanism 12, a second transmission mechanism 14, a controller 16, a detector 17 and a tire pressure detection component.

[0105] like Figure 1 , Figure 2 and Figure 3 As shown, the drive axle 10 is arranged on the paving machine body 21, and can output power outward under the action of the driving device of the paving machine body 21; the first driving wheel group 11 is arranged on the rear side of the drive axle 10, and the second driving wheel group 13 is arranged on the front side of the drive axle 10 to form two rows of front and rear driving wheel groups; the first driving wheel group 11 is provided with two first driving wheels 111, and the second driving wheel group 13 is provided with two second driving wheels 131 to form a four-wheel drive form.

[0106] The second driving wheel set 13 is rotationally connected to the first driving wheel set 11 via a connecting mechanism 15 . Driven by the connecting mechanism 15 , the second driving wheel set 13 can rotate around the rotating shaft of the first driving wheel set 11 to achieve lifting movement of the second driving wheel set 13 .

[0107] The first drive wheel 111 is connected to the output end of the drive axle 10 through the first transmission mechanism 12, and the second drive wheel 131 is connected to the first transmission mechanism 12 through the second transmission mechanism 14. The second transmission mechanism 14 can be connected to the first transmission mechanism 12 to take power through the first transmission mechanism 12 and drive the second drive wheel 131 to rotate, and the second transmission mechanism 14 can also be disconnected from the first transmission mechanism 12.

[0108] like Figures 1 to 3As shown, the second driving wheel group 13 also includes a lifting mechanism 132, which is connected to the connecting mechanism 15 and is used to drive the connecting mechanism 15 to rotate relative to the first driving wheel group 11, thereby driving the second driving wheel 131 to move up and down in the height direction, thereby adjusting the driving mode.

[0109] Specifically, Figure 1 , Figure 4 and Figure 5 As shown, the two first drive wheels 111 and the two second drive wheels 131 are respectively arranged corresponding to the two ends of the drive bridge 10, so as to be transmission-connected with the drive bridge 10; a connecting mechanism 15 is provided on the inner side of each second drive wheel 131, and the first drive wheel 111 and the second drive wheel 131 located on the same side are rotationally connected to the same connecting mechanism 15, so that a rotational connection is formed between the second drive wheel 131 and the first drive wheel 111.

[0110] The lifting mechanism 132 includes two lifting cylinders 1321, which are respectively arranged corresponding to the connecting mechanisms 15 on both sides. One end of the lifting cylinder 1321 is rotatably connected to the connecting mechanism 15, and the other end is rotatably connected to the frame 211 above the connecting mechanism 15. Through the telescopic movement of the lifting cylinder 1321, the connecting mechanism 15 can be rotated around the first driving wheel 111. When the lifting cylinder 1321 is retracted, the connecting mechanism 15 rotates upward to drive the second driving wheel 131 to rise. When the lifting cylinder 1321 is extended, the connecting mechanism 15 rotates downward to drive the second driving wheel 131 to descend.

[0111] like Figure 5 , Figure 6 and Figure 7 As shown, the connecting mechanism 15 is provided with a first limiting hole 151, which is specifically a waist-shaped hole, and there are two of them; the connecting mechanism 15 is also provided with a first axial hole 152 and a second axial hole 153, which are respectively used to connect the first driving wheel 111 and the second driving wheel 131; the extension direction of each waist-shaped hole is adapted to the rotation arc of the connecting mechanism 15, and the two waist-shaped holes are arranged at intervals in the circumferential direction with the first axial hole 152 as the center.

[0112] A limiting structure corresponding to the first limiting hole 151 is provided on the frame 211 and extends into the first limiting hole 151. When the connecting mechanism 15 is driven by the lifting cylinder 1321 to rotate, the position of the first limiting hole 151 changes relative to the limiting structure. When the limiting structure abuts against the end wall of the first limiting hole 151, the connecting mechanism 15 is limited so that the lifting stroke of the connecting mechanism 15 is limited within a suitable range.

[0113] like Figure 5 , Figure 8 and Fig. 9As shown, the first transmission mechanism 12 includes two first sprocket mechanisms 121 , and the second transmission mechanism 14 includes two second sprocket mechanisms 141 .

[0114] Specifically, the two first sprocket mechanisms 121 are respectively arranged corresponding to the two first driving wheels 111, and each first sprocket mechanism 121 includes a first driving wheel 1211, a first driven wheel 1212, a first transmission chain 1213 and a first driving shaft 1214; the first transmission chain 1213 is meshed with the first driving wheel 1211 and the first driven wheel 1212, the first driving wheel 1211 is connected to the output end of the driving bridge 10, and the first driven wheel 1212 is connected to the first driving wheel 111 through the first driving shaft 1214, so as to realize the transmission connection between the driving bridge 10 and the first driving wheel 111. When the driving bridge 10 is working, the driving bridge 10 transmits power to the first driving wheel 111 through the first driving wheel 1211, the first transmission chain 1213, the first driven wheel 1212 and the first driving shaft 1214, so that the first driving wheel 111 rotates, thereby driving the paving machine body 21 to travel.

[0115] like Fig. 9 and Fig.10 As shown, two second sprocket mechanisms 141 are respectively arranged corresponding to the two second driving wheels 131, and each second sprocket mechanism 141 includes a second driving wheel 1411, a second driven wheel 1412, a second transmission chain 1413, a second driving shaft 1414 and a clutch 1415. The second transmission chain 1413 is meshed with the second driving wheel 1411 and the second driven wheel 1412, the second driven wheel 1412 is connected to the second driving wheel 131 through the second driving shaft 1414, and the second driving wheel 1411 is connected to the first driving shaft 1214; a clutch 1415 is arranged between the second driving wheel 1411 and the first driving shaft 1214, and the clutch 1415 adjusts the transmission relationship between the second driving wheel 1411 and the first driving shaft 1214 through connection or separation operation.

[0116] like Figures 9 to 12 As shown, the controller 16 is electrically connected to the lifting mechanism 132, the clutch 1415 and the detector 17; the detector 17 can detect whether the second drive wheel 131 is in a slipping state, and the controller 16 can control the lifting mechanism 132 and the clutch 1415 according to the detection result of the detector 17. According to the working scene and construction requirements of the paver 2, the controller 16 controls the lifting mechanism 132 to drive the second drive wheel 131 to rise or fall, and controls the clutch 1415 to perform corresponding actions.

[0117] When the second driving wheel 131 is in working state, the controller 16 controls the clutch 1415 to perform a connection operation, so that the second driving wheel 1411 forms a transmission connection with the first driving shaft 1214, and then transmits power to the second driving wheel 131 through the second driving wheel 1411, the second transmission chain 1413, the second driven wheel 1412 and the second driving shaft 1414, so that the second driving wheel 131 rotates. Among them, when the second driving wheel 131 slips, the controller 16 controls the lifting mechanism 132 to adjust the second driving wheel 131, so that the second driving wheel 131 descends, increases the adhesion between the second driving wheel 131 and the ground, improves the anti-skid performance, and reduces the impact of slippage on the normal operation of the paver 2. When the second driving wheel 131 is in non-working state, the controller 16 controls the lifting mechanism 132 to drive the second driving wheel 131 to rise, and controls the clutch 1415 to perform a separation operation, so that the second transmission mechanism 14 is disconnected from the first transmission mechanism 12, and stops transmitting power to the second driving wheel 131, so as to reduce energy consumption.

[0118] like Figure 8 and Fig.13 As shown, the tire pressure detection component includes a plurality of tire pressure sensors 18, which are respectively arranged on the two second drive wheels 131, and are used to detect the tire pressure of the second drive wheel 131; wherein, the controller 16 is electrically connected to the tire pressure sensor 18, and when the second drive wheel 131 and the first drive wheel 111 are working at the same time, the controller 16 controls the lifting mechanism 132 to work according to the tire pressure of the second drive wheel, so as to drive the second drive wheel 131 to rise or fall, so that the tire pressure of the second drive wheel 131 meets the operating requirements to prevent slipping.

[0119] Furthermore, a tire pressure sensor 18 is also provided on the first driving wheel 111 to detect the tire pressure of the first driving wheel 111, so that the operator can timely know the tire pressure status of the first driving wheel 111 and make timely adjustments when the tire pressure of the first driving wheel 111 exceeds the normal tire pressure range.

[0120] like Figures 8 to 10 As shown, the first transmission mechanism 12 is also provided with a first tensioner 122 matched with the first transmission chain 1213, and the second transmission mechanism 14 is also provided with a second tensioner 142 matched with the second transmission chain 1413, so as to adjust the tension state of the first transmission chain 1213 and the second transmission chain 1413 respectively, so as to keep the first transmission chain 1213 and the second transmission chain 1413 in a suitable tension state, and prevent the transmission chain from being too loose or too tight to affect normal transmission. When assembled on the paving machine body 21, the first tensioner 122 and the second tensioner 142 can be respectively installed at corresponding positions on the frame 211 for easy fixation. Among them, the first tensioner 122 is a mechanical tensioner, and the second tensioner 142 is a hydraulic tensioner.

[0121] Specifically, Fig.14 , Fig.15 and Fig.16 As shown, the second tensioner 142 includes a mounting seat 1421, a tensioning wheel 1423 and a tensioning oil cylinder 1422. The mounting seat 1421 is fixedly connected to the frame 211 and is arranged at a position corresponding to the first transmission chain 1213; the two ends of the tensioning oil cylinder 1422 are respectively connected to the mounting seat 1421 and the tensioning wheel 1423, and the tensioning wheel 1423 cooperates with the first transmission chain 1213 to adjust the position of the tensioning wheel 1423 through the telescopic movement of the tensioning oil cylinder 1422, thereby changing the size of the tensioning force, and realizing the adjustment of the tensioning state of the first transmission chain 1213, without manual adjustment, which is convenient and quick. Among them, a second limiting hole 1424 is provided on the mounting seat 1421, and a limiting slider 1425 is provided on the side of the tensioning wheel 1423 corresponding to the mounting seat 1421. The limiting slider 1425 extends into the second limiting hole 1424 and can slide along the extension direction of the second limiting hole 1424 under the drive of the tensioning cylinder 1422, thereby limiting the tensioning wheel 1423.

[0122] When the paver 2 is in the process of paving, the adhesion between the driving wheel and the ground is required to be high. At this time, the second driving wheel 131 and the first driving wheel 111 can work together to increase the adhesion between the tire and the ground, enhance the overall driving force and anti-skid performance; when encountering uneven road conditions, the second driving wheel 131 can also be raised and lowered at any time to adjust the contact state between the second driving wheel 131 and the road surface to prevent slipping. When the paver 2 is in the non-operating process or the transfer process, the paver 2 does not require high driving force. At this time, the second driving wheel 131 can be raised, and the paver 2 can be driven only by the first driving wheel 111 to improve driving flexibility and improve turning performance. There is no need to transmit driving force to the second driving wheel 131, and the second transmission mechanism 14 can be disconnected from the first transmission mechanism 12.

[0123] The construction machinery drive system 1 in this embodiment can adopt different driving modes according to different construction scenes, which can effectively improve the adaptability to different road surfaces and prevent slipping. At the same time, the paver 2 has higher driving flexibility, which can prevent or reduce the impact on turning performance; in addition, the use of an adjustable second transmission mechanism 14 is conducive to improving energy utilization efficiency and reducing energy consumption.

[0124] Embodiment 9

[0125] This embodiment provides a paving machine 2, such as Figures 1 to 5 As shown, the paver 2 includes a paver body 21 and the engineering machinery drive system 1 in any of the above-mentioned embodiments.

[0126] The paver body 21 is the main body of the paver 2, and can be provided with working devices, such as a screed plate, a hopper, etc. The working devices travel with the paver body 21 to perform paving operations. The drive axle 10 of the engineering machinery drive system 1 is fixedly connected to the paver body 21 and extends in the lateral direction of the paver body 21, with both ends being output ends. The first drive wheel set 11 and the second drive wheel set 13 of the engineering machinery drive system 1 are arranged below the drive axle 10, and the second drive wheel set 13 is located in front of the first drive wheel set 11.

[0127] The first drive wheel set 11 is connected to the output end of the drive bridge 10 through the first transmission mechanism 12; the second drive wheel set 13 is connected to the first drive wheel set 11 through the connection mechanism 15, and can rotate around the first drive wheel set 11 to realize the lifting movement of the second drive wheel set 13, so as to adjust the driving mode and realize the first drive wheel set 11 driving alone or the first drive wheel set 11 and the second drive wheel set 13 driving at the same time; the second drive wheel 131 of the second drive wheel set 13 is connected to the first transmission mechanism 12 through the second transmission mechanism 14, wherein the second transmission mechanism 14 can form a transmission connection or disconnect the transmission connection with the first transmission mechanism 12 to adapt to the working state of the second drive wheel 131, so as to stop transmitting power to the second drive wheel 131 when the second drive wheel 131 is in a non-working state.

[0128] The paver 2 in this embodiment can adopt different driving modes according to different working scenes and construction requirements, which can effectively improve the adaptability to different road surfaces, enhance the anti-skid performance, and prevent slipping. At the same time, the paver 2 has higher driving flexibility, which can prevent or reduce the impact on turning performance; in addition, the transmission relationship of the second drive wheel 131 can be adjusted according to the different working states of the second drive wheel 131, which is conducive to saving energy and reducing energy consumption.

[0129] In addition, the paver 2 in this embodiment also has all the beneficial effects of the engineering machinery drive system 1 in any of the above embodiments, which will not be repeated here.

[0130] A specific embodiment of the present application is provided below:

[0131] A floating engineering machinery driving system consists of an axle, a driving chain a, a sprocket a, a sprocket b, a rear wheel system a, a driving shaft system a, a tensioning device a, a linkage device, a transmission chain b, a tensioning device b, a lifting cylinder, a sprocket c, a rear wheel system b, a driving shaft system b, etc.

[0132] Power transmission route: The sprocket on the axle is connected to sprocket a through the drive chain a, and there is a certain transmission ratio between the two sprockets. At this time, the drive shaft system a will be driven to rotate, and the rear wheel system a will be driven to rotate. At this time, due to the coaxial relationship, the sprocket b will rotate synchronously. The sprocket b and sprocket c are connected by the transmission chain b. Through the chain drive, the sprocket c will be driven to rotate around the drive shaft system b. Also due to the coaxial relationship, the rear wheel system b will rotate synchronously.

[0133] When designing the connection between the rear wheel system b and the rear wheel system a bracket, a linkage device is specially designed. When the rear wheel system b is raised or lowered, the linkage device rotates around the fulcrum. A waist-shaped hole is designed on the linkage device, so that the rear wheel system b rotates around an arc during the raising or lowering process, making the raising or lowering convenient.

[0134] The chain will become loose during the lifting and lowering of the rear wheel system b. At this time, the chain needs to be tensioned. Since the rear wheel system a is fixed, a mechanically adjustable tensioning device a is used here. The rear wheel system b needs to float. For convenience, a hydraulic one-button tensioning device b is specially designed.

[0135] The driving system of construction machinery is driven by the lifting cylinder installed on the linkage device. When the rear wheel system b needs to be away from the ground to facilitate steering and save energy, just move the lifting cylinder upward to drive the linkage device to rotate upward around the fulcrum; when the rear wheel system b needs to contact the ground to increase adhesion and solve the problem of slipping, just move the lifting cylinder downward to drive the linkage device to rotate downward around the fulcrum. Easy to operate.

[0136] To save energy, when the paver is working normally or in the process of transfer, the lifting cylinder is used to rotate around the support through the linkage device, so as to lift the rear wheel system b and move the rear wheel system b away from the working surface. The clutch is disengaged through the electronic control system, so that only the sprocket c of the rear wheel system rotates on the axis, and other components are in a relatively static state.

[0137] The above describes in detail the technical solutions of some embodiments of the present invention in combination with the accompanying drawings. Different driving modes can be adopted according to different construction scenes, which can effectively improve the adaptability to different road surfaces and prevent slipping. At the same time, the driving flexibility of the paver is higher, which can prevent the turning performance from being affected. In addition, the use of an adjustable second transmission mechanism is conducive to improving energy utilization efficiency and reducing energy consumption.

[0138] In the embodiments of the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0139] In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by terms such as “up”, “down”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the technical solution of the present application.

[0140] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", 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 invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0141] The above are only preferred embodiments of the present invention and are not intended to limit the technical solution of the present application. For those skilled in the art, the technical solution of the present application may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the technical solution of the present application shall be included in the protection scope of the present application.

Claims

1. A construction machinery drive system (1), characterized in that: include: Drive axle (10); A first driving wheel set (11), wherein a first driving wheel (111) of the first driving wheel set (11) is drivingly connected to the driving axle (10) via a first transmission mechanism (12); a second driving wheel set (13), the second driving wheel set (13) being rotationally connected to the first driving wheel set (11) via a connecting mechanism (15), and capable of being lifted or lowered by rotating relative to the first driving wheel set (11); The second driving wheel (131) of the second driving wheel set (13) is connected to the first transmission mechanism (12) via a second transmission mechanism (14), and the second transmission mechanism (14) can form a transmission connection with the first transmission mechanism (12) or disconnect the transmission connection; The second driving wheel set (13) further comprises: a lifting mechanism (132) connected to the connecting mechanism (15) and used for driving the connecting mechanism (15) to rotate relative to the first driving wheel set (11) so as to enable the second driving wheel (131) to perform a lifting movement; The first driving wheel set (11) comprises two first driving wheels (111), which are respectively arranged at two ends of the driving bridge (10); The second driving wheel set (13) comprises two second driving wheels (131), which are respectively arranged at the front sides of the two first driving wheels (111), and a connecting mechanism (15) is arranged on the inner side of each second driving wheel (131); The lifting mechanism (132) comprises two lifting cylinders (1321), which are respectively arranged corresponding to the connecting mechanisms (15) on both sides, and one end of the lifting cylinder (1321) is rotatably connected to the connecting mechanism (15), and the other end extends upward from the connecting mechanism (15) to be connected to the frame of the engineering machinery; The first transmission mechanism (12) comprises two first sprocket mechanisms (121), each of the first sprocket mechanisms (121) comprises a first driving wheel (1211), a first driven wheel (1212), a first transmission chain (1213) and a first drive shaft (1214), the first driving wheel (1211) being connected to an output end of the drive bridge (10), and the first driven wheel (1212) being connected to the first drive wheel (111) via the first drive shaft (1214); The second transmission mechanism (14) comprises two second sprocket mechanisms (141), each of the second sprocket mechanisms (141) comprises a second driving wheel (1411), a second driven wheel (1412), a second transmission chain (1413), a second drive shaft (1414) and a clutch (1415), the second driven wheel (1412) being connected to the second drive wheel (131) via the second drive shaft (1414), the clutch (1415) being arranged between the second driving wheel (1411) and the first drive shaft (1214), and being used to establish a transmission connection or disconnect a transmission connection between the second driving wheel (1411) and the first drive shaft (1214); A controller (16) electrically connected to the lifting mechanism (132) and used to control the operation of the lifting mechanism (132); A plurality of tire pressure sensors (18), respectively disposed on the two second driving wheels (131), and used for detecting the tire pressure of the second driving wheels (131); The controller (16) is electrically connected to a tire pressure sensor (18), and when the second drive wheel (131) and the first drive wheel (111) are working simultaneously, the controller (16) controls the lifting mechanism (132) to work according to the tire pressure of the second drive wheel (131), so as to drive the second drive wheel (131) to rise or fall; The second transmission mechanism (14) further comprises a second tensioner (142) which cooperates with the second transmission chain (1413) and is used to adjust the tension state of the second transmission chain (1413); The second tensioner (142) comprises: A mounting seat (1421) is arranged corresponding to the first transmission chain (1213), and a second limiting hole (1424) is provided on the mounting seat (1421); A tensioning wheel (1423) is matched with the first transmission chain (1213), and a limiting slider (1425) is provided on one side of the tensioning wheel (1423), and the limiting slider (1425) extends into the second limiting hole (1424); A tensioning cylinder (1422) is connected to the mounting seat (1421) at one end and to the tensioning wheel (1423) at the other end, and is used to drive the tensioning wheel (1423) to slide along the extension direction of the second limiting hole (1424) to adjust the tensioning state of the first transmission chain (1213).

2. The construction machinery drive system (1) according to claim 1, characterized in that: Each of the connecting mechanisms (15) is provided with at least one first limiting hole (151) for cooperating with a limiting structure on the frame, so as to limit the rotation of the connecting mechanism (15) through relative movement between the limiting structure and the first limiting hole (151); Wherein, the first limiting hole (151) is arranged along the circumferential direction with the rotating shaft of the first driving wheel (111) as the center.

3. The construction machinery drive system (1) according to claim 1, characterized in that: The controller (16) is electrically connected to the clutch (1415) and is used to control the operation of the clutch (1415) so as to disconnect the transmission connection between the second driving wheel (1411) and the first driving shaft (1214) after the second driving wheel (131) leaves the ground.

4. The construction machinery drive system (1) according to claim 3, characterized in that: Also includes: a detector (17), arranged corresponding to the second driving wheel (131), and used for detecting whether the second driving wheel (131) is in a slipping state; The controller (16) is electrically connected to the detector (17) to control the operation of the lifting mechanism (132) according to the detection result of the detector (17).

5. The construction machinery drive system (1) according to claim 2, characterized in that: The first transmission mechanism (12) further comprises a first tensioner (122) which cooperates with the first transmission chain (1213) and is used to adjust the tension state of the first transmission chain (1213).

6. A paver (2), characterized in that: include: A paving machine body (21), wherein the paving machine body (21) is provided with a frame; The construction machinery drive system (1) as claimed in any one of claims 1 to 5, wherein the drive axle (10) of the construction machinery drive system (1) is connected to the paving machine body (21), and the first drive wheel set (11) of the construction machinery drive system (1) is located at the rear side of the drive axle (10), and the second drive wheel set (13) is located at the front side of the drive axle (10).

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