Special vehicles and their power systems

Abstract

The present invention provides a special vehicle and its power system. The power system includes an engine, a hydraulic main pump, an assembly bracket, and a transmission pump. The engine has two parallel output shafts that rotate about their own axes. The hydraulic main pump is located on one side of the engine and connected to one of the engine's output shafts, thereby outputting high-pressure oil to drive the special vehicle's drive axle. The assembly bracket is located on the same side of the engine as the hydraulic main pump and has a height difference with the hydraulic main pump. The transmission pump is mounted on the assembly bracket and connected to the other output shaft of the engine, thereby outputting high-pressure oil to drive the special vehicle's rear axle steering.

Description

Technical Field

[0001] The present invention relates to the field of special vehicles, and in particular to a special vehicle and a power system thereof. Background Art

[0002] A traditional vehicle includes an engine, a drive shaft, a gearbox, a drive axle assembly and drive wheels. The engine provides driving force, the gearbox changes the speed and torque from the engine, and the gearbox and drive axle assembly are connected by a drive shaft. The drive axle assembly changes the speed and torque from the gearbox and transmits them to the drive wheel mechanism to achieve the movement of the vehicle.

[0003] However, in the vehicle with the above structure, the engine and transmission assembly takes up a large layout space of the vehicle, which makes the layout space for the upper installation and modification of the vehicle small. Summary of the Invention

[0004] The object of the present invention is to provide a special vehicle and a power system thereof, so as to solve the problem in the prior art that the space for vehicle installation and modification is relatively small.

[0005] In order to solve the above technical problems, the present invention provides a power system for a special vehicle, comprising: an engine having two output shafts arranged in parallel, which rotate around their own axes; a hydraulic main pump located on one side of the engine and connected to one of the output shafts of the engine, thereby outputting high-pressure oil to drive the driving axle of the special vehicle; an assembly bracket located on the same side of the engine as the hydraulic main pump and having a height difference with the hydraulic main pump; a transmission pump installed at the assembly bracket; the transmission pump is connected to the other output shaft of the engine, thereby outputting high-pressure oil to drive the rear axle steering of the special vehicle.

[0006] In one embodiment, the transmission pump includes two hydraulic pumps arranged in parallel, one of which is connected to the rear axle steering, and the other is used to connect to the cooling system of the special vehicle.

[0007] In one embodiment, the output shaft of the engine is connected to the hydraulic main pump via a first coupling.

[0008] In one embodiment, a shell is provided on the outer periphery of the first coupling; and the assembly bracket is fixedly connected to the shell.

[0009] In one embodiment, the assembly bracket is plate-shaped and is arranged vertically;

[0010] The transmission pump is connected to the assembly bracket via fasteners.

[0011] In one embodiment, the output shaft of the engine is connected to the transmission pump via a second coupling.

[0012] In one embodiment, the transmission pump is connected to the rear axle steering and the cooling system respectively through first connecting pipes.

[0013] In one embodiment, the hydraulic main pump is connected to the drive axle via a second connecting pipeline.

[0014] The present invention also provides a special vehicle, comprising a drive axle, a rear axle steering, a cooling system and the power system as described above, wherein the drive axle is connected to the hydraulic main pump, and the rear axle steering is connected to the transmission pump.

[0015] It can be seen from the above technical solution that the advantages and positive effects of the present invention are:

[0016] The power system of the present invention realizes the change of gear and vehicle speed of special vehicles through the cooperation of the engine, hydraulic main pump and hydraulic motor. Compared with the related technology, the gearbox is omitted, and the layout space of the special vehicle is increased.

[0017] The engine drives the transmission pump, which in turn drives the rear axle steering, thereby realizing rear wheel steering of the special vehicle. Therefore, the special vehicle in the present invention realizes all-wheel steering, thereby improving the maneuverability of the special vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of one embodiment of the special vehicle of the present invention;

[0019] Figure 2 It is a structural schematic diagram of one embodiment of the power system of the present invention;

[0020] Figure 3 yes Figure 2 Exploded view of the powertrain;

[0021] Figure 4 It is a structural schematic diagram of one embodiment of the drive axle of the present invention;

[0022] Figure 5 yes Figure 4 Schematic diagram of the structure of the middle drive axle housing and mounting bracket;

[0023] Figure 6 It is a schematic diagram of the principle of the power system of the present invention driving the drive axle.

[0024] Among them, the figure numbers are explained as follows: 1. Special vehicle; 11. Frame; 12. Power system; 121. Engine; 122. Hydraulic main pump; 123. Assembly bracket; 124. Transmission pump; 125. First coupling; 126. Second coupling; 13. Drive axle; 131. Drive axle housing; 132. Mounting bracket; 133. Hydraulic motor; 14. Travel wheel; 15. Solenoid valve; 16. Overflow valve. DETAILED DESCRIPTION

[0025] Typical embodiments embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative rather than limiting.

[0026] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] The present invention provides a special vehicle with a large upper installation and modification space, which is suitable for vehicles with special purposes, such as mixing tank trucks and snow removal vehicles.

[0028] See Figure 1 The special vehicle 1 includes a frame 11, a power system 12, a driving axle 13, running wheels 14, a rear axle steering (not shown in the figure) and a cooling system (not shown in the figure).

[0029] For the convenience of explanation, the longitudinal direction of the frame 11 is defined as the longitudinal direction, and the width direction of the frame 11 is defined as the transverse direction. The direction of the frame 11 close to the cab is defined as the front, and the direction away from the cab is defined as the rear.

[0030] The vehicle frame 11 is frame-shaped and generally includes two longitudinal beams spaced apart and parallel to each other and a plurality of transverse beams disposed between the two longitudinal beams.

[0031] The power system 12 is arranged at the front of the vehicle frame 11. Figure 2 and Figure 3 The power system 12 specifically includes an engine 121 , a hydraulic main pump 122 , an assembly bracket 123 and a transmission pump 124 .

[0032] The engine 121 is fixed to the front of the vehicle frame 11 and is used to provide power for the entire special vehicle 1. Specifically, the engine 121 has two output shafts arranged in parallel, each output shaft rotating around its own axis. In this embodiment, the two output shafts are respectively a first output shaft and a second output shaft.

[0033] The hydraulic main pump 122 is disposed on one side of the engine 121 , and the hydraulic main pump 122 is located at the bottom of the engine 121 . In this embodiment, the hydraulic main pump 122 is located at the rear side of the engine 121 .

[0034] The input end of the hydraulic main pump 122 is connected to the second output shaft of the engine 121 via a second coupling 126, so that the input end of the hydraulic main pump 122 rotates together with the second output shaft. Specifically, the input end of the hydraulic main pump 122 is fixedly connected to one end of the second coupling 126, and the second output shaft is fixedly linked to the other end of the second coupling 126.

[0035] The hydraulic main pump 122 is driven by the engine 121 , that is, when the second output shaft rotates, the hydraulic main pump 122 outputs high-pressure oil.

[0036] In this embodiment, the hydraulic main pump 122 can be a plunger pump, or a gear pump, or a screw pump, and the specific setting depends on actual conditions.

[0037] The assembly bracket 123 is installed above the housing of the second coupling 126 , thereby achieving connection between the assembly bracket 123 and the engine 121 .

[0038] Specifically, the assembly bracket 123 is plate-shaped and vertically arranged. A through hole is provided in the middle of the assembly bracket 123, and the axis of the through hole extends in the longitudinal direction.

[0039] The transmission pump 124 is connected to the mounting bracket 123 to achieve installation, creating a height difference between the transmission pump 124 and the main hydraulic pump 122. In this embodiment, the transmission pump 124 comprises two hydraulic pumps arranged in parallel. These two hydraulic pumps are respectively connected to the rear axle steering and cooling systems, thereby driving the rear axle steering and cooling systems. The two hydraulic pumps are connected to the rear axle steering and cooling systems respectively via first connecting pipes.

[0040] Specifically, the transmission pump 124 is connected to the engine 121 via a first coupling 125, so that the input end of the transmission pump 124 rotates together with the first output shaft of the engine 121. When the transmission pump 124 is driven by the engine 121, that is, when the first output shaft rotates, the transmission pump 124 outputs high-pressure oil.

[0041] The first coupling 125 is located above the second coupling 126. The input end of the transmission pump 124 passes through a through hole in the assembly bracket 123 and is connected to the first coupling 125, thereby connecting to the first output shaft of the engine 121. Specifically, the input end of the transmission pump 124 is fixedly connected to one end of the first coupling 125, and the first output shaft is fixedly connected to the other end of the first coupling 125.

[0042] The drive axles 13 include a front drive axle 13 disposed at the front of the vehicle frame 11 and a rear drive axle 13 disposed at the rear of the vehicle frame 11. The front drive axle 13 and the rear drive frame 11 are spaced apart along the length, i.e., the longitudinal direction, of the vehicle frame 11. The drive axles 13 are connected to the hydraulic main pump 122 via a second connecting pipeline.

[0043] The front drive axle 13 is located behind the power system 12, specifically behind the hydraulic main pump 122. Figure 4 and Figure 5 The front drive axle 13 includes a drive axle housing 131 , a mounting bracket 132 and a hydraulic motor 133 .

[0044] The drive axle housing 131 extends in the transverse direction and is connected to the vehicle frame 11 through the front suspension.

[0045] Travel wheels 14 are mounted on both ends of the drive axle housing 131 .

[0046] The mounting bracket 132 is disposed in the middle of the drive axle housing 131 in the longitudinal direction and protrudes from one side of the drive axle housing 131. In this embodiment, the mounting bracket 132 protrudes from the rear side of the drive axle housing 131. Specifically, in this embodiment, the mounting bracket 132 is integrally formed with the drive axle housing 131, thereby improving the overall strength of the front drive axle 13.

[0047] The hydraulic motor 133 is connected to the mounting bracket 132 to achieve the installation of the hydraulic motor 133 , and the hydraulic motor 133 is connected to the running wheel 14 to drive the rotation of the running wheel 14 , thereby achieving the running function.

[0048] In this embodiment, the mounting bracket 132 has an installation space inside, and the peripheral wall of the installation space is provided with internal splines. The outer periphery of the hydraulic motor 133 is provided with external splines, which are adapted to the internal splines to achieve the installation of the hydraulic motor 133.

[0049] In other embodiments, an inner flat keyway may be provided on the peripheral wall of the installation space. An outer flat keyway is provided on the outer periphery of the hydraulic motor 133, and the outer flat keyway matches the inner flat keyway to achieve connection between the hydraulic motor 133 and the mounting bracket 132 via a flat key.

[0050] In another embodiment, the mounting bracket 132 and the hydraulic motor 133 may be connected via flanges and fasteners.

[0051] The hydraulic motor 133 is connected to the hydraulic main pump 122 via a hydraulic pipeline, thereby converting the high-pressure oil delivered by the hydraulic main pump 122 into mechanical energy, thereby driving the travel wheel 14 to rotate.

[0052] Specifically, a solenoid valve 15 is provided between the hydraulic motor 133 and the hydraulic main pump 122 . The engine 121 drives the hydraulic main pump 122 , and the power drives the hydraulic motor 133 via the solenoid valve 15 , and the hydraulic motor 133 drives the travel wheels 14 .

[0053] The solenoid valve 15 has a spring position and a gain position. When the solenoid valve 15 is in the spring position, the hydraulic motor 133 rotates forward and the special vehicle 1 is in a forward state. When the solenoid valve 15 is in a gain position, the hydraulic motor 133 rotates reversely and the special vehicle 1 is in a reverse state.

[0054] The rear drive axle 13 is located behind the front drive axle 13 , and its mounting bracket 132 protrudes from the front side of the drive axle housing 131 .

[0055] When the rear drive axle 13 is driven by the engine 121 and the solenoid valve 15 is in the spring position, the hydraulic motor 133 rotates in the reverse direction, thereby cooperating with the front drive axle 13 to put the special vehicle 1 in a forward state. When the solenoid valve 15 is in the energized state, the hydraulic motor 133 rotates in the forward direction, thereby cooperating with the front drive axle 13 to put the special vehicle 1 in a reverse state.

[0056] The remaining structures of the rear drive axle 13 are consistent with those of the front drive axle 13 , and reference may be made to the description of the front drive axle 13 , which will not be described in detail here.

[0057] See Figure 6 The power system 12 provides power to the drive axle 13, and the working principle of the drive axle 13 is as follows:

[0058] The engine 121 starts, driving the hydraulic main pump 122. This power, through the solenoid valve 15, drives the solenoid valves 15 of the front and rear drive axles 13. At this point, the solenoid valve 15 of the front drive axle 13 is in the spring position, and its hydraulic motor 133 rotates forward, causing the running wheels 14 on the front drive axle 13 to rotate forward. The solenoid valve 15 of the rear drive axle 13 is in the spring position, and its hydraulic motor 133 rotates reversely, causing the running wheels 14 on the rear drive axle 13 to rotate reversely, thereby enabling the special vehicle 1 to move forward.

[0059] The engine 121 starts, driving the hydraulic main pump 122. This power, through the solenoid valve 15, drives the solenoid valves 15 of the front and rear drive axles 13. At this point, the solenoid valve 15 of the front drive axle 13 is in the neutral position, causing its hydraulic motor 133 to rotate in reverse, causing the running wheels 14 on the front drive axle 13 to rotate in reverse. The solenoid valve 15 of the rear drive axle 13 is in the neutral position, causing its hydraulic motor 133 to rotate in the forward direction, causing the running wheels 14 on the rear drive axle 13 to rotate in the forward direction, thereby enabling the special vehicle 1 to reverse.

[0060] Furthermore, a relief valve 16 is provided between the hydraulic main pump 122 and the two hydraulic motors 133 . The relief valve 16 is provided on the hydraulic pipeline to prevent the hydraulic pipeline from being overloaded, thereby forming a safety circuit.

[0061] Both the front and rear drive axles include hydraulic motors 133, each driven by a hydraulic main pump 122. This eliminates the need for a drive shaft to connect the front and rear drive axles, improving their transmission efficiency. Furthermore, the space between the front and rear drive axles provides space for installation and modification. The absence of a drive shaft between the front and rear drive axles also allows for flexible design and adjustment of the wheelbase of the special vehicle 1 in this embodiment, breaking down design barriers that hinder the layout of certain short-wheelbase vehicles.

[0062] Through the cooperation of the engine 121, the hydraulic main pump 122 and the hydraulic motor 133, the gear position and vehicle speed of the special vehicle 1 are changed. Compared with the related technology, the gearbox is omitted, and the layout space of the special vehicle 1 is increased.

[0063] The rear axle steering system is connected to one of the hydraulic pumps in the transmission pump 124 and receives power from it, thereby achieving the steering function. Specifically, the rear axle steering system includes a hydraulic cylinder and left and right steering wheels. The hydraulic cylinder has two piston rods, which are connected to the left and right steering wheels respectively. The hydraulic cylinder is connected to the transmission pump 124 and receives power, which causes the piston rods to move left or right, thereby achieving steering.

[0064] The transmission pump 124 is driven by the engine 121, and then the rear axle steering is driven to realize the rear wheel steering of the special vehicle 1, wherein the front wheel steering is the same as in the related art. Therefore, the special vehicle 1 in the present invention realizes all-wheel steering, thereby improving the maneuverability of the special vehicle 1.

[0065] The cooling system is connected to another hydraulic pump of the transmission pump 124 and is driven by the hydraulic pump to circulate the cooling liquid to achieve the cooling function. Specifically, the cooling system includes a radiator, a cooling pipe, and a cooling medium located within the cooling pipe. In this embodiment, the cooling medium is oil.

[0066] The hydraulic pump starts, providing power to make the heat dissipation medium flow in the heat dissipation pipe and enter the radiator for cooling, and then enter the heat dissipation pipe for circulation.

[0067] It can be seen from the above technical solution that the advantages and positive effects of the present invention are:

[0068] The power system of the present invention realizes the change of gear and vehicle speed of special vehicles through the cooperation of the engine, hydraulic main pump and hydraulic motor. Compared with the related technology, the gearbox is omitted, and the layout space of the special vehicle is increased.

[0069] The engine drives the transmission pump, which in turn drives the rear axle steering, thereby realizing rear wheel steering of the special vehicle. Therefore, the special vehicle in the present invention realizes all-wheel steering, thereby improving the maneuverability of the special vehicle.

[0070] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are intended to be illustrative and exemplary rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims, such that all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A power system for a special vehicle, characterized in that: include: The engine has two output shafts arranged in parallel, and the output shafts rotate around their own axes; the engine is fixed to the front of the frame of the special vehicle, and the direction of the frame closer to the cab is the front; The hydraulic main pump is located on one side of the engine and is connected to one of the output shafts of the engine to output high-pressure oil to drive the drive axle of the special vehicle; the hydraulic main pump is a plunger pump; the output shaft of the engine and the hydraulic main pump are connected by a second coupling; a shell is provided on the outer periphery of the second coupling; the drive axle includes a front drive axle arranged at the front of the frame and a rear drive axle arranged at the rear of the frame; the front drive axle and the rear drive axle both include a drive axle housing, a mounting bracket and a hydraulic motor, and the mounting bracket of the front drive axle The mounting bracket is arranged in the middle of the drive axle housing of the front drive axle in the length direction and protrudes out from the rear side of the drive axle housing. The mounting bracket of the front drive axle is integrally formed with the drive axle housing of the front drive axle. The hydraulic motor of the front drive axle is connected to the mounting bracket of the front drive axle. The interior of the mounting bracket has an installation space, and the peripheral wall of the installation space is provided with an internal spline; the outer periphery of the hydraulic motor is provided with an external spline, and the external spline is adapted to the internal spline to realize the installation of the hydraulic motor; the mounting bracket of the rear drive axle protrudes out of the rear drive axle. The front side of the drive axle housing; a solenoid valve is further provided between the hydraulic motor and the hydraulic main pump, the engine drives the hydraulic main pump, and the power drives the hydraulic motor via the solenoid valve; the solenoid valve corresponding to the rear drive axle cooperates with the solenoid valve corresponding to the front drive axle to put the special vehicle in a forward state or a reverse state; when the solenoid valve corresponding to the front drive axle is in the spring position, its hydraulic motor rotates forward, so that the running wheels at the front drive axle rotate forward; when the solenoid valve corresponding to the rear drive axle is in the spring position, its hydraulic motor rotates reversely, so that the running wheels at the rear drive axle rotate reversely When the electromagnetic valve corresponding to the front drive axle is in the gain state, the hydraulic motor thereof rotates in the reverse direction, so that the traveling wheels at the front drive axle rotate in the reverse direction; when the electromagnetic valve corresponding to the rear drive axle is in the gain state, the hydraulic motor thereof rotates in the forward direction, so that the traveling wheels at the rear drive axle rotate in the forward direction, so that the special vehicle moves in the reverse direction; the hydraulic motor is connected to the hydraulic main pump via a hydraulic pipeline; an overflow valve is further provided between the hydraulic main pump and the two hydraulic motors, and the overflow valve is provided on the hydraulic pipeline to prevent the hydraulic pipeline from being overloaded; An assembly bracket is located on the same side of the engine as the hydraulic main pump and has a height difference with the hydraulic main pump; the assembly bracket is fixedly connected to the housing; the assembly bracket is plate-shaped and arranged vertically; a through hole is defined in the middle of the assembly bracket, and the axis of the through hole extends longitudinally; A transmission pump is installed on the assembly bracket, and the input end of the transmission pump passes through the through hole on the assembly bracket and is connected to the first coupling; the transmission pump is connected to the other output shaft of the engine, so as to output high-pressure oil to drive the rear axle steering of the special vehicle; the transmission pump includes two hydraulic pumps arranged in parallel, one of which is connected to the rear axle steering, and the other hydraulic pump is used to connect to the cooling system of the special vehicle, and the cooling system includes a radiator, a cooling pipe and a cooling medium located in the cooling pipe; the rear axle steering includes a hydraulic cylinder and a left steering wheel and a right steering wheel, and the hydraulic cylinder is provided with two piston rods, which are respectively connected to the left steering wheel and the right steering wheel, and the hydraulic cylinder is connected to the transmission pump to receive power drive, so that the piston rod moves to the left or right, thereby realizing steering; the special vehicle has front-wheel steering.

2. The power system of a special vehicle according to claim 1, characterized in that: The transmission pump is connected to the assembly bracket via fasteners.

3. The power system of a special vehicle according to claim 1, characterized in that: The output shaft of the engine is connected to the transmission pump via a first coupling.

4. The power system of a special vehicle according to claim 1, characterized in that: The transmission pump is connected to the rear axle steering and the cooling system respectively through first connecting pipelines.

5. The power system of a special vehicle according to claim 1, characterized in that: The hydraulic main pump is connected to the drive axle via a second connecting pipeline.

6. A special vehicle, characterized in that: The vehicle comprises a driving axle, a rear axle steering system, a cooling system and a power system according to any one of claims 1 to 5, wherein the driving axle is connected to the hydraulic main pump, and the rear axle steering system is connected to the transmission pump.

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