CN206530558U - A kind of travel driving system for hydraulic pressure 4 wheel driven agricultural machinery - Google Patents

Abstract

The utility model provides a walking drive system for hydraulic four-wheel drive agricultural machinery, which includes a hydraulic mechanism, a driving wheel driving mechanism and a steering wheel driving mechanism. The hydraulic mechanism includes a fuel tank connected through a hydraulic pipeline, a closed variable column Piston pump, closed quantitative plunger motor, free wheel valve group and two low-speed high-torque motors, closed variable displacement piston pump drives closed fixed quantitative plunger motor, closed fixed quantitative plunger motor drives two Walking driving wheel; the closed variable plunger pump drives two low-speed high-torque motors through the free wheel valve group, and the two low-speed high-torque motors drive two steering wheels through the steering wheel drive mechanism to realize hydraulic four-wheel drive. At the same time, the operation Personnel can use four-wheel drive when the load is heavy, and two-wheel drive when the load is small, which is easy to switch and saves energy.

Description

A walking drive system for hydraulic four-wheel drive agricultural machinery

technical field

The utility model relates to the field of agricultural machinery, in particular to a walking drive system for hydraulic four-wheel drive agricultural machinery.

Background technique

At present, wheeled agricultural machinery basically adopts the walking mode of front wheel drive and rear wheel steering. Now that agricultural machinery is developing towards intelligence and large-scale, the driving force required is increasing. The driving mode of two-wheel drive can no longer meet the walking needs of large-scale agricultural machinery. , The utility model adopts a hydraulic mechanism to realize hydraulic four-wheel drive. The utility model adopts four-wheel drive when the load is large, and two-wheel drive when the load is small, which is simple to switch and saves energy.

Utility model content

The technical problem to be solved by the utility model is: to provide a walking drive system for hydraulic four-wheel drive agricultural machinery, which adopts hydraulic mechanism to realize hydraulic four-wheel drive, adopts four-wheel drive when the load is large, and adopts two-wheel drive when the load is small, and the switching is simple ,save energy.

In order to achieve the above object, the technical solution adopted by the utility model is: a walking drive system for hydraulic four-wheel drive agricultural machinery, including a hydraulic mechanism, a driving wheel driving mechanism and a steering wheel driving mechanism, the hydraulic mechanism includes The fuel tank, closed variable displacement plunger pump, closed quantitative plunger motor, freewheel valve group and two low-speed high-torque motors are connected with the road. The fuel tank is connected with the closed variable displacement plunger pump, and the closed variable displacement plunger The two oil outlets of the pump are respectively connected with the two oil inlets of the closed quantitative piston motor, and the output shaft of the closed fixed quantitative piston motor is connected with the two driving wheels through the drive wheel drive mechanism; the free The input end of the valve group of the free wheel is connected with the two oil inlets of the closed quantitative plunger motor, and the output end of the valve group of the free wheel is connected with the two oil inlet pipes of the two low-speed high-torque motors connected in parallel. Two low-speed high-torque motors are respectively connected to the two steering wheels through the rotating wheel drive mechanism; the closed variable plunger pump drives the closed quantitative plunger motor, and the closed quantitative plunger motor drives the two walking wheels through the drive wheel drive mechanism. Drive wheel; the closed variable plunger pump drives two low-speed high-torque motors through the free wheel valve group, and the two low-speed high-torque motors drive two steering wheels through the steering wheel drive mechanism to realize hydraulic four-wheel drive;

Preferably, the closed variable displacement plunger pump is also provided with an independent control pump that provides pressure energy to the free wheel valve group, the oil inlet of the control pump is connected to the oil tank, and the oil outlet of the control pump is connected to the free wheel The valve group is connected;

Preferably, the freewheel valve group includes a two-position four-way electromagnetic directional valve and a three-position five-way hydraulic directional valve, and the positive oil inlet of the two-position four-way electromagnetic directional valve is connected to the oil outlet of the control pump. Connection, the positive oil outlet of the two-position four-way electromagnetic directional valve is connected with the control oil port of the three-position five-way hydraulic directional valve, and the reverse oil inlet of the two-position four-way electromagnetic directional valve is connected with the three-position five-way hydraulic directional valve. The oil return port of the hydraulic reversing valve is connected with the oil drain port, and the reverse oil outlet of the two-position four-way electromagnetic reversing valve is connected with the oil tank; the two oil inlets of the three-position five-way hydraulic reversing valve The port is connected to the two oil inlets of the closed quantitative plunger motor respectively, and the two oil outlets of the three-position five-way hydraulic reversing valve are respectively connected to the two oil inlets of the two low-speed high-torque motors connected in parallel. , The oil outlets of the two low-speed high-torque motors are connected in parallel to the oil tank, and the two-position, four-way electromagnetic directional valve can control the work of the three-position, five-way hydraulic directional valve through the pressure provided by the control pump.

The beneficial effects brought by the utility model are: the utility model adopts a hydraulic mechanism to realize hydraulic four-wheel drive, adopts four-wheel drive when the load is large, and adopts two-drive when the load is small, saving energy; the utility model adopts a low-speed high-torque motor, which is easy to install , The low-speed high-torque motor is installed on the rear axle to directly drive the steering wheels.

Description of drawings

Fig. 1 is the overall schematic diagram of the utility model;

Fig. 2 is the structural representation of hydraulic mechanism in the utility model;

Marks in the figure: 1. Closed variable displacement plunger pump, 2. Control pump, 3. Low-speed high-torque motor, 4. Closed quantitative plunger motor, 5. Two-position four-way electromagnetic reversing valve, 6. Free wheel valve Group, 7. Three-position five-way hydraulic reversing valve, 8. Fuel tank.

detailed description

The principles and features of the utility model will be described in detail below in conjunction with the embodiments, which are only used to describe the utility model, and are not intended to limit the scope of the utility model.

As shown in Figure 1, a walking drive system for hydraulic four-wheel drive agricultural machinery includes a hydraulic mechanism, a driving wheel driving mechanism and a steering wheel driving mechanism, and the driving wheel driving mechanism and the steering wheel driving mechanism are relatively mature in the field technology, which will not be described in detail here. The drive wheel drive mechanism mainly includes a gearbox and a wheel speed reducer. The plunger motor 4, the freewheel valve group 6 and two low-speed high-torque motors 3, the oil tank 8 is connected with the closed variable displacement plunger pump 1, and the two oil outlets of the closed variable displacement plunger pump are connected with the closed variable displacement plunger pump respectively. The two oil inlets of the quantitative plunger motor 3 are connected, and the output shaft of the closed quantitative plunger motor is connected with the two driving wheels through the drive wheel drive mechanism; the input end of the free wheel valve group 6 is connected to the closed type. The two oil inlets of the quantitative plunger motor are connected, and the output end of the free wheel valve group is connected with the two oil inlet pipes of two low-speed high-torque motors connected in parallel. The two low-speed high-torque motors 3 are respectively Correspondingly connected with the two steering wheels through the rotating wheel drive mechanism; the closed variable displacement plunger pump drives the closed quantitative plunger motor, and the closed quantitative plunger motor drives the two walking driving wheels through the drive wheel drive mechanism; the closed variable displacement The plunger pump drives two low-speed high-torque motors through the freewheel valve group, and the two low-speed high-torque motors drive two steering wheels through the steering wheel drive mechanism. The low-speed high-torque motor is installed on the rear axle and directly drives the steering wheels to realize hydraulic four drive;

The closed variable displacement plunger pump 1 is also provided with an independent control pump 2 that provides pressure energy to the freewheel valve group. The control pump 2 and the closed variable displacement plunger pump 1 are independent of each other, wherein the closed variable displacement plunger pump 1 drives the closed quantitative plunger motor, and the control pump 2 provides pressure energy to the free wheel valve group; the closed variable piston pump 1 is connected to the oil inlet of the control pump and the oil tank, and the oil outlet of the control pump is connected to the free wheel valve Group phase connection;

The freewheel valve group 6 includes a two-position four-way electromagnetic reversing valve 5 and a three-position five-way hydraulic reversing valve 7. The forward oil outlet of the two-position four-way electromagnetic reversing valve is connected with the control oil port of the three-position five-way hydraulic reversing valve 7, and the reverse oil inlet of the two-position four-way electromagnetic reversing valve is connected with the The oil return port of the three-position five-way hydraulic reversing valve is connected with the oil drain port, and the reverse oil outlet of the two-position four-way electromagnetic reversing valve is connected with the oil tank 8; the three-position five-way hydraulic reversing valve The two oil inlets are respectively connected to the two oil inlets of the closed quantitative plunger motor, and the two oil outlets of the three-position five-way hydraulic reversing valve 7 are respectively connected to the two outlets of the two low-speed high-torque motors 3 connected in parallel. The oil inlet pipes are connected, the oil outlets of the two low-speed high-torque motors are connected in parallel and then connected to the oil tank, and the two-position four-way electromagnetic directional valve can control the pressure provided by the three-position five-way hydraulic directional valve through the control pump. work; in this embodiment, the positive oil inlet of the two-position four-way electromagnetic reversing valve is the pressure oil port P of the reversing valve, the forward oil outlet is the working oil port A of the reversing valve, and the reverse The oil inlet is the working oil port B of the reversing valve, and the reverse oil outlet is the oil return port T of the reversing valve. The passages between the oil inlet and the forward oil outlet, and the reverse oil inlet and the reverse oil outlet are respectively connected, and the oil in the oil tank is pressurized by the control pump and enters the forward port of the two-position four-way electromagnetic reversing valve. to the oil inlet, and then flows from the forward oil outlet of the two-position four-way electromagnetic directional valve to the control oil port of the three-position five-way hydraulic directional valve, driving the spool of the three-position five-way hydraulic directional valve to move, Then the channels between the two oil inlets and the two oil outlets of the three-position five-way hydraulic reversing valve are connected respectively, and the three-position five-way hydraulic reversing valve, the closed variable plunger pump and the low-speed high-torque motor The oil circuit is connected, and the low-speed high-torque motor drives the two steering wheels through the steering wheel drive mechanism to realize four-wheel drive; at the same time, the oil flowing out from the oil outlets of the two low-speed high-torque motors directly flows back to the fuel tank, and from the three-position five-way The oil flowing out of the oil return port and oil drain port of the hydraulic reversing valve flows back to the oil tank through the reverse oil inlet and reverse oil outlet port of the two-position four-way electromagnetic reversing valve; , the positive oil circuit of the two-position four-way electromagnetic reversing valve is disconnected, and the spool of the three-position five-way hydraulic reversing valve returns to the initial position after losing pressure energy, so that the two positions of the three-position five-way hydraulic reversing valve The passages between the first oil inlet and the two oil outlets are respectively disconnected, and the low-speed high-torque motor idles and does not work after losing the driving pressure, realizing two-wheel drive.

The working process of the utility model is a walking drive system for hydraulic four-wheel drive agricultural machinery: the oil in the oil tank 8 is divided into two paths after being pressurized by the closed variable plunger pump 1, and then enters the closed quantitative plunger motor 4 respectively. The two oil inlets drive the operation of the closed quantitative plunger motor, and the closed quantitative plunger motor 4 drives the two driving wheels to run through the drive wheel drive mechanism; when the two-position four-way electromagnetic reversing valve 5 is powered on, the two-position The passages between the forward oil inlet and the forward oil outlet, the reverse oil inlet and the reverse oil outlet of the four-way electromagnetic reversing valve are respectively connected, and the oil in the oil tank 8 is pressurized by the control pump 2 Enter the positive oil inlet port of the two-position four-way electromagnetic reversing valve, and then flow from the positive oil outlet port of the two-position four-way electromagnetic reversing valve 5 to the control oil port of the three-position five-way hydraulic reversing valve 7, driving The spool of the three-position five-way hydraulic reversing valve 7 moves, so that the two oil inlets and two oil outlets of the three-position five-way hydraulic reversing valve are connected respectively, and then the three-position five-way hydraulic reversing valve 7, The closed variable plunger pump 1 and the low-speed high-torque motor 3 are connected to the oil circuit. After the low-speed large motor works, the two steering wheels are driven to run through the steering wheel drive mechanism; at the same time, the oil flows out from the two low-speed high-torque motor oil outlets. The oil directly flows back to the oil tank 8, and the oil flowing out from the oil return port and oil drain port of the three-position five-way hydraulic reversing valve 7 passes through the reverse oil inlet and reverse oil outlet of the two-position four-way electromagnetic reversing valve 5 flow back to the oil tank; when the two-position four-way electromagnetic reversing valve loses power, the positive oil circuit of the two-position four-way electromagnetic reversing valve is disconnected, and the spool of the three-position five-way hydraulic reversing valve 7 returns to the oil tank after losing pressure energy. to the initial position, and then the passages between the two oil inlets and the two oil outlets of the three-position five-way hydraulic reversing valve are respectively disconnected, and the low-speed high-torque motor idling does not work after losing the driving pressure, realizing two-drive When the operator uses the utility model, the two-position four-way electromagnetic reversing valve can be energized to realize four-wheel drive when the load is large, and the two-position four-way electromagnetic reversing valve can be powered off when the load is small to realize two-wheel drive. Simple control and energy saving.

Claims (3)

1. A walking drive system for hydraulic four-wheel drive agricultural machinery, including a hydraulic mechanism, a drive wheel drive mechanism and a steering wheel drive mechanism, characterized in that: the hydraulic mechanism includes an oil tank (8) connected through a hydraulic pipeline , a closed variable displacement plunger pump (1), a closed quantitative piston motor (4), a freewheel valve group (6) and two low-speed high-torque motors (3), the oil tank (8) and the closed variable displacement column The two oil outlets of the closed variable displacement piston pump are respectively connected with the two oil inlets of the closed quantitative piston motor (3), and the output shaft of the closed quantitative piston motor passes through The driving wheel driving mechanism is connected with the two walking driving wheels; the input end of the free wheel valve group (6) is connected with the two oil inlet ports of the closed quantitative plunger motor, and the output end of the free wheel valve group is connected with the parallel The two oil inlet pipes of the two low-speed high-torque motors (3) are respectively connected to the two steering wheels through the rotating wheel drive mechanism; the closed variable displacement plunger pump drives Closed quantitative plunger motor, the closed quantitative plunger motor drives two travel driving wheels through the drive wheel drive mechanism; the closed variable piston pump drives two low-speed high-torque motors through the free wheel valve group, two low-speed high-torque motors The two steering wheels are driven by the steering wheel drive mechanism to realize hydraulic four-wheel drive. 2. A walking drive system for hydraulic four-wheel drive agricultural machinery according to claim 1, characterized in that: the closed variable displacement plunger pump (1) is also provided with an independent free wheel valve group The control pump (2) that provides pressure energy, the oil inlet port of the control pump is connected with the oil tank (8), and the oil outlet port of the control pump is connected with the free wheel valve group. 3. A walking drive system for hydraulic four-wheel drive agricultural machinery according to claim 2, characterized in that: the free wheel valve group (6) includes a two-position four-way electromagnetic reversing valve (5) and three The five-position hydraulic directional valve (7), the forward oil inlet port of the two-position four-way electromagnetic directional valve (5) is connected to the oil outlet of the control pump (2), the two-position four-way electromagnetic directional valve The positive oil outlet is connected to the control oil port of the three-position five-way hydraulic directional valve (7), and the reverse oil inlet port of the two-position four-way electromagnetic directional valve is connected to the oil return port of the three-position five-way hydraulic directional valve. connected to the drain port, and the reverse oil outlet of the two-position four-way electromagnetic directional valve is connected to the oil tank (8); the two oil inlets of the three-position five-way hydraulic directional valve are connected to the closed quantitative The two oil inlets of the plunger motor are connected respectively, and the two oil outlets of the three-position five-way hydraulic reversing valve (7) are respectively connected with the two oil inlet pipes of two low-speed high-torque motors (3) connected in parallel. Connection, the oil outlets of the two low-speed high-torque motors are connected in parallel and then connected to the fuel tank. The two-position four-way electromagnetic directional valve can control the work of the three-position five-way hydraulic directional valve through the pressure provided by the control pump.