Low-speed running driving device of pavement maintenance truck

Abstract

The utility model relates to a low-speed running driving device for a pavement maintenance truck, which comprises a driving device body mounted on a pavement maintenance tail frame, the driving device body consists of a mounting frame and hydraulic oil cylinders, and the hydraulic oil cylinders are vertically mounted on the left and right sides of the tail frame close to the bottom of the frame respectively. A horizontally-arranged installation frame is arranged under the two hydraulic oil cylinders, the two sides of the top of the installation frame are welded to the bottoms of piston rods in the two hydraulic oil cylinders respectively, a driving mechanism is installed at the bottom of the installation frame, and when the pavement maintenance truck runs at a high speed, the piston rods of the hydraulic oil cylinders retract to drive the installation frame to ascend; the driving mechanism is not contacted with the ground; when the pavement maintenance vehicle runs at a low speed, the vehicle is in a neutral gear, the piston rod of the hydraulic oil cylinder extends out to drive the mounting frame to descend, and the driving mechanism on the mounting frame is in contact with the ground, so that the maintenance vehicle runs at a low speed during construction. The device is simple and reasonable in overall structure, convenient to install and maintain and safe and reliable in operation.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical equipment technology and relates to a low-speed driving drive device for road maintenance vehicles. Background Technology

[0002] After a period of use, asphalt pavements often develop various defects, including cracking, rutting, subsidence, bulging, undulation, particle loss, loosening, and spalling. These require the use of road maintenance vehicles for repair and maintenance. Currently, maintenance vehicles are integrated road maintenance vehicles that combine heating, milling, paving, and compaction functions. However, existing integrated maintenance vehicles, due to their use of a vehicle chassis, have a high speed even in first gear, which is insufficient to meet the requirements of heating, milling, paving, and compaction. Using a semi-clutch to reduce speed results in insufficient power and accelerates clutch wear. Traditional vehicle chassis, when requiring low-speed travel during construction, primarily use friction wheels to drive the rear wheels; this method causes significant wear on the rear wheels, affecting vehicle safety.

[0003] To address this issue, a low-speed driving device for road maintenance vehicles was designed to overcome the aforementioned problems. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a road maintenance vehicle low-speed driving device with a simple and reasonable structure, convenient installation and maintenance, safe and reliable operation, which does not require any changes to the original vehicle chassis transmission system, can realize high-speed driving of the car, and can meet the needs of low-speed driving during construction operations, and the driving speed is easy to control.

[0005] This utility model is achieved through the following technical solution: a low-speed driving drive device for a road maintenance vehicle, comprising a drive device body mounted on the rear frame of the road maintenance vehicle. The drive device body consists of a mounting frame and hydraulic cylinders. There are at least two hydraulic cylinders, which are respectively vertically mounted on the left and right sides of the rear frame near the bottom of the frame. A protective guide mechanism is provided on the outside of each hydraulic cylinder, and a horizontally mounted mounting frame is provided directly below the two hydraulic cylinders. The top two sides of the mounting frame are welded to the bottom of the piston rods inside the two hydraulic cylinders, and a drive mechanism is installed at the bottom of the mounting frame. When the road maintenance vehicle is traveling at high speed, the piston rods of the hydraulic cylinders retract, causing the mounting frame to rise, and the drive mechanism does not contact the ground. When the road maintenance vehicle is traveling at low speed and the vehicle is in neutral, the piston rods of the hydraulic cylinders extend, causing the mounting frame to descend, and the drive mechanism on the mounting frame contacts the ground, thus achieving the need for low-speed driving of the maintenance vehicle during construction.

[0006] Preferably, a cylinder connecting lug is provided on each side of the top surface of the mounting frame for fixed connection with the protective guide mechanism on the outside of each hydraulic cylinder, and a mounting seat is provided on the bottom surface of the mounting frame for fixed installation of the drive mechanism.

[0007] Preferably, the drive mechanism consists of a drive shaft, drive wheels, and a hydraulic motor. The mounting base on the bottom of the mounting bracket consists of at least two bearing mounting bases with mounting through holes and a motor mounting base. After at least one set of drive wheels is fitted onto the drive shaft, the drive shaft is horizontally inserted and passes through each mounting through hole. One end of the drive shaft is connected to the hydraulic motor via a coupling. The hydraulic motor is mounted on the motor mounting base, and a seated bearing is installed on the other end of its drive shaft to prevent the drive wheels from falling out during operation.

[0008] Preferably, the protective guiding mechanism is a guide cylinder assembly, which is sleeved between the cylinder barrel and the mounting bracket of the hydraulic cylinder, located outside the piston rod of the hydraulic cylinder. The guide cylinder assembly consists of an upper guide cylinder and a lower guide cylinder, the lower guide cylinder having a smaller diameter than the upper guide cylinder. The lower guide cylinder is disposed inside the upper guide cylinder and is movably connected to the upper guide cylinder. A guide cylinder connecting lug is provided at the bottom of the lower guide cylinder and is fixedly connected to the cylinder connecting lug. The lower guide cylinder moves up and down inside the upper guide cylinder as the piston rod of the hydraulic cylinder extends and retracts, protecting the piston rod and reducing wear on the piston rod during operation.

[0009] Preferably, the extension lengths of the upper and lower guide cylinders are greater than the extension length of the hydraulic cylinder piston rod.

[0010] Preferably, the drive wheel is made of rubber or silicone to increase the friction between the drive wheel and the ground.

[0011] Compared with the prior art, the advantages of this utility model are as follows:

[0012] The low-speed driving drive device for road maintenance vehicles designed in this invention can meet both high-speed driving needs and low-speed driving needs during construction operations, and the driving speed is easy to control. This invention has many advantages, including a simple and reasonable overall structure, convenient installation and maintenance, safe and reliable operation, and no need to make any changes to the original vehicle chassis transmission system. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of the present invention in operation.

[0014] Figure 2 This is a left-side view of the present invention during operation.

[0015] Figure 3 This is a front view schematic diagram of the present invention when it is not in operation.

[0016] Figure 4 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 5 This is a front view schematic diagram of the mounting bracket in this utility model.

[0018] Figure 6 This is a schematic diagram of the guide cylinder assembly in this utility model. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1-4As shown, a low-speed driving drive device for a road maintenance vehicle includes a drive device body mounted on the rear frame of the road maintenance vehicle. The drive device body consists of a mounting frame 1 and hydraulic cylinders 2. There are at least two hydraulic cylinders 2, which are respectively vertically mounted on the left and right sides of the rear frame near the bottom of the frame. A protective guide mechanism is provided on the outside of each hydraulic cylinder, and a horizontally positioned mounting frame 1 is provided directly below the two hydraulic cylinders 2. The top two sides of the mounting frame 1 are welded to the bottom of the piston rods inside the two hydraulic cylinders 2, and a drive mechanism is installed at the bottom of the mounting frame 1. When the road maintenance vehicle is traveling at high speed, the vehicle is driven by the chassis, the piston rods of the hydraulic cylinders 2 retract, driving the mounting frame to rise, and the drive mechanism does not contact the ground. When the road maintenance vehicle is traveling at low speed, the vehicle is in neutral, the piston rods of the hydraulic cylinders 2 extend, driving the mounting frame 1 to descend, and the drive mechanism on the mounting frame contacts the ground, thus achieving the low-speed driving requirement of the road maintenance vehicle during construction. The mounting frame 1 has a cylinder connecting lug 3 on each side of its top surface for fixed connection with the protective guide mechanism on the outside of each hydraulic cylinder 2. Mounting seats are provided on the bottom surface of the mounting frame 1 for fixing the drive mechanism. The drive mechanism consists of a drive shaft 4, drive wheels 5, and a hydraulic motor 6. The mounting seats on the bottom surface of the mounting frame 1 consist of at least two bearing mounting seats 7 with mounting through holes and a motor mounting seat 8. After at least one set of drive wheels 5 are fitted onto the drive shaft 4, the drive shaft 4 is horizontally inserted and passes through each mounting through hole. One end of the drive shaft 4 is connected to the hydraulic motor 6 via a coupling 9. The hydraulic motor 6 is mounted on the motor mounting seat 8. A seated bearing 14 is installed on the other end of the drive shaft 4 to prevent the drive wheels 5 from falling out during operation.

[0022] The hydraulic cylinders in this invention are arranged in pairs. When the ground is uneven, the left and right cylinders can extend to different lengths to ensure that the drive wheel is pressed firmly against the ground.

[0023] like Figure 5-6 As shown, the protective guiding mechanism is a guide cylinder assembly. The guide cylinder assembly is sleeved between the cylinder barrel of the hydraulic cylinder 2 and the mounting bracket 1, located outside the piston rod of the hydraulic cylinder 2. The guide cylinder assembly consists of an upper guide cylinder 10 and a lower guide cylinder 11. The diameter of the lower guide cylinder 11 is smaller than that of the upper guide cylinder 10. The lower guide cylinder 11 is disposed inside the upper guide cylinder 10 and movably connected to it. A guide cylinder connecting lug 12 is provided at the bottom of the lower guide cylinder 11 and is fixedly connected to the cylinder connecting lug 3. The lower guide cylinder 11 moves up and down within the upper guide cylinder 10 as the piston rod of the hydraulic cylinder 2 extends and retracts, protecting the piston rod and reducing wear during operation. The extension and retraction lengths of the upper guide cylinder 10 and the lower guide cylinder 11 are greater than the extension and retraction length of the piston rod of the hydraulic cylinder 2. The drive wheel 5 is made of rubber or silicone to increase the friction between the drive wheel 5 and the ground.

[0024] In this invention, the upper guide cylinder and the lower guide cylinder are installed on the same axis and can extend and retract freely. The extension and retraction length is greater than the extension and retraction length of the hydraulic cylinder. This ensures the normal use of the piston rod and protects the piston rod, while also preventing the lower guide cylinder from falling out of the upper guide cylinder (the lower guide cylinder and the piston rod of the hydraulic cylinder are both fixedly connected to the mounting base and extend and retract simultaneously. The extension and retraction length is greater than the extension and retraction length of the hydraulic cylinder, which ensures that when the piston rod is in its longest extended state, the lower guide cylinder part is still inside the upper guide cylinder).

[0025] The working principle of this utility model is as follows:

[0026] When the maintenance vehicle is traveling at low speed, it is in neutral gear. The hydraulic cylinder extends and presses the drive wheels against the ground, providing the pressure required for friction. The hydraulic motor drives the drive wheels to rotate, and the friction generated between the drive wheels and the ground propels the vehicle. The driving speed is controlled by the speed of the hydraulic motor, and the driving direction is controlled by the rotation direction of the hydraulic motor, thus achieving the need for low-speed driving when the maintenance vehicle is working.

[0027] When traveling at high speed, the hydraulic cylinder retracts, separating the drive wheels from the ground, and the maintenance vehicle is converted to a car chassis for driving, thus meeting the need for high-speed travel of the maintenance vehicle.

[0028] The low-speed driving drive device for road maintenance vehicles designed in this utility model can meet the needs of both high-speed driving and low-speed driving during construction operations. The driving speed is easy to control, and it has many advantages such as simple and reasonable overall structure, convenient installation and maintenance, safe and reliable operation, and no need to make any changes to the original vehicle chassis transmission system.

[0029] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A low-speed travel drive device for a road maintenance vehicle, comprising a drive device body mounted on a road maintenance vehicle rear frame, characterized by: The drive device body is composed of a mounting frame (1) and hydraulic cylinders (2), the hydraulic cylinders (2) are at least two, vertically installed on the left and right sides of the tail frame (13) near the bottom of the frame, a protection guide mechanism is arranged on the outer side of each hydraulic cylinder, and a mounting frame (1) is arranged below the two hydraulic cylinders (2) and horizontally, the top of the mounting frame (1) is welded with the bottom of the piston rod in the two hydraulic cylinders (2) respectively, and a drive mechanism is mounted at the bottom of the mounting frame (1), when the road maintenance vehicle drives at high speed, the piston rod of the hydraulic cylinder (2) is retracted, the mounting frame is lifted, and the drive mechanism is not in contact with the ground; when the road maintenance vehicle drives at low speed, the car is in neutral position, the piston rod of the hydraulic cylinder (2) is extended to drive the mounting frame (1) to descend, the drive mechanism on the mounting frame is in contact with the ground, and the needs of low-speed driving during maintenance vehicle construction are realized.

2. The low speed drive apparatus for a road maintenance vehicle according to claim 1, characterized by: The top of the mounting frame (1) is provided with an oil cylinder connecting lug (3) on both sides, which is used for fixed connection between the protection guide mechanism on the outer side of each hydraulic cylinder (2), and a mounting seat is arranged on the bottom of the mounting frame (1) for fixing and mounting the drive mechanism.

3. The low speed drive apparatus for a road maintenance vehicle according to claim 1, characterized by: The drive mechanism is composed of a drive shaft (4), a drive wheel (5) and a hydraulic motor (6), the mounting seat on the bottom of the mounting frame (1) is composed of at least two bearing mounting seats (7) with mounting holes and a motor mounting seat (8), after at least one set of drive wheels (5) is sleeved on the drive shaft (4), the drive shaft (4) is inserted into and penetrates each mounting hole, one end of the drive shaft (4) is connected with the hydraulic motor (6) through a shaft coupling (9), the hydraulic motor (6) is mounted on the motor mounting seat (8), and a bearing (14) is mounted on the other end of the drive shaft (4), so that the drive wheel (5) is prevented from falling off during work.

4. The road maintenance vehicle low-speed travel drive device according to claim 2 or 3, characterized by: The protection guide mechanism is a guide cylinder assembly, which is sleeved between the cylinder barrel of the hydraulic cylinder (2) and the mounting frame (1) and located outside the piston rod of the hydraulic cylinder (2), and the guide cylinder assembly is composed of an upper guide cylinder (10) and a lower guide cylinder (11), the diameter of the lower guide cylinder (11) is smaller than that of the upper guide cylinder (10), the lower guide cylinder (11) is arranged in the upper guide cylinder (10) and movably connected with the upper guide cylinder (10), a guide cylinder connecting lug (12) is arranged at the bottom of the lower guide cylinder (11) and fixedly connected with the oil cylinder connecting lug (3), and the lower guide cylinder (11) moves up and down in the upper guide cylinder (10) along with the extension and retraction of the piston rod of the hydraulic cylinder (2), so as to protect the piston rod and reduce the wear of the piston rod during work.

5. The low speed drive apparatus for a road maintenance vehicle according to claim 4, characterized by: The extension length of the upper guide cylinder (10) and the lower guide cylinder (11) is greater than the extension length of the piston rod of the hydraulic cylinder (2).

6. The low speed drive apparatus for a road maintenance vehicle according to claim 3, characterized by: The drive wheel (5) is composed of rubber or silicone, which is used for improving the friction between the drive wheel (5) and the ground.

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