SU1520198A1 - Hydraulic drive of motor grader - Google Patents

Abstract

The invention relates to earthmoving equipment and reduces power consumption in a hydraulic drive. The hydraulic actuator has pumps 1 and 2 of working equipment and steering control. The working cavities of the main hydraulic cylinders (HZ) 3 are communicated through a manual control unit 4 of hydraulic valves (GR) with pressure and drain hydraulic lines (CH) 5 and 6. A selector GR 7 is connected to block 4. The main unit 8 of electrically controlled GR is connected to the working cavity The Hz 3 and the inlet 9 communicate with the output 10 of the selector GR 7. The additional block 11 of electrically controlled GRs is connected to the working cavities of the additional HZ 12 and to the inlet 13 and the outlet 10 of the selector GR 7. The shaft of the pump 2 is kinematically connected to the shaft of the pump 1. The hydraulic actuator has check valves 14 and 15. Inlet C Apana 14 communicates with drain CH 6. The valve 14 output communicates with the pump 2 inlet and with the valve 15 inlet. Outputs 10 and 16 of the selector GR 7 and block 8 are connected to the outlet of the valve 14. Valve 15 exit communicates with the input 13 of the selector GR 7. Selector The GR 7 is configured to communicate in one of the positions of its pressure head spool GL 5 with the pump 2 inlet and exit 16 of the block 8 from the drain GL 6. In the automatic mode of the motor grader, the core GR 7 switches to the right position. The pressurized fluid enters the inlet of pump 2. Pump 2 operates in motor mode. This reduces energy costs in the hydraulic drive. 1 il.

Description

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additional HZ 12 cavity and to input 13 and output 10 of selector GR 7. Pump shaft 2 is kinematically connected to pump shaft 1. The hydraulic actuator has check valves 14 and 15. Valve 14 inlet communicates with drain CH 6, Valve 14 outlet communicates with inlet pump 2 and with the valve inlet 15. Outlets 10 and 16 of the selector GR 7 and block Q ka 8 are connected to the outlet of the valve 14. The valve 15 output communicates with the inlet 13 of the selector GR 7. The selector GR 7

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made with the possibility of communication in one of the positions of its spool of pressure head CH 5 with the inlet of pump 2 and exit 16 of block 8 from drain GL 6. In the automatic mode of operation of the grader, the spool of state GR 7 switches to the right position. The pressurized fluid enters the inlet of pump 2. Pump 2 operates in the motor mode. This allows for a reduction in the cost of the zeros. hyi in the hydraulic drive. 1 il.

The invention relates to earth moving equipment and can be used in hydraulic motor graders.

The purpose of the invention is to reduce energy consumption in the hydraulic drive.

The drawing shows a diagram of the hydraulic motor grader.

The hydraulic drive of the motor grader consists of a pump 1 of the working equipment, a pump 2 of the steering, a block of hydraulic distributors and hydraulic cylinders. The working cavities of the main hydraulic cylinders 3 are communicated through a manual control unit 4 with hydraulic distributors with pressure and drain lines 5 and 6. A selector valve 7k is also connected to unit 4. The main unit 8 of hydraulic control valves for hydraulic distributors is connected to the working cavity of hydraulic valve 1H and LPI 3 and input 9 communicated with the output 10 of the selector valve 7. The additional block 11 of the electrically controlled valves is connected to the working spaces. additional hydraulic cylinders 12 and to the inlet 13. and outlet 10 of the hydraulic distributor 7. The steering pump 2 is kinematically connected with the shaft of the pump 1 of the working equipment. The hydraulic actuator is equipped with two check valves 14 and 15.- The inlet of the check valve 14 is connected to the drain hydraulic line 6, and its output is connected to the pump 2 inlet, to the outlet 10 of the hydraulic distributor 7, to the outlet 16 of the unit 8 and to the inlet of the check valve 15, the output of which is communicated with the inlet 13 of the hydraulic distributor 7. The selector hydraulic distributor-gel 7 is made with the possibility of sorption in one of the positions of its hydraulic valve of the pressure hydraulic line 5 sec.

five

30 35-do 45 jO with

pump house and exit 16 of block 8 - with

 drain hydroline 6.

The hydraulic motor grader works as follows.

During the operation of the hydraulic system of the grader in the manual control mode, the working fluid is supplied from the pump 1 of the working equipment through the block 4 of the hydraulic distributors with the manual control to hydraulic cylinders 3 or through the hydraulic distributor and the block 11

hydraulic cylinders 12. During operation of hydraulic cylinders 12, the hydraulic valve 7 and any of the hydraulic valves of the block 11 are simultaneously turned on, while the hydraulic valve 7 moves to the extreme left position, and the check valve 15 is closed and prevents the flow of fluid through the block 8 into the drain hydraulic line 6. Hydraulic power supply steering is carried out by pump 2, the valve 14 is open and allows fluid flow to the inlet of pump 2 from the drainage line 6; In addition, when the hydraulic cylinders 12 are in operation, inlet of the pump 2 a backwater is created ti equal hydraulic resistance discharge line 6.

The operation of the motor grader in automatic control mode results in a signal from the position sensor of the working body (not shown) being simultaneously applied to the hydraulic distributor 7 and to any of the distributors of the unit 8. At this, the hydraulic distributor 7 moves to the extreme position and the fluid pressure is supplied to the inlet of the pump 2 and to the unit 11, while the check valve 15 is open and allows the passage of fluid into the drainage line 6. Part of the fluid is supplied to the inlet of the steering pump 2, the flow of which is usually less than the flow of the pump 1. what equipment. Consequently, the remaining part of the flow, equal to the difference in feeds of pumps 1 and 2, is fed to the power distributors of block 8 and further to the hydraulic cylinders 3, (since for operation in automatic control mode, the speed of movement of hydraulic cylinders 3 must be several times lower than with manual management.

As a result of creating an overpressure in the automatic mode of operation of the grader at the inlet of the steering pump 2, the latter operates in the engine mode, which allows reducing the energy costs in the hydraulic drive.

Claims (1)

Invention Formula The hydraulic motor of the motor grader, which contains the working equipment pump, the pressure and drain lines, the hydraulic control valve block with manual control, the main hydraulic cylinders, the working cavities of which are communicated through the hydraulic control valve block with hydraulic control valve and hydraulic drain valve, are connected to the hydraulic control valve block with manual control valve control, additional hydraulic cylinders of the main unit of electrically controlled hydraulic distributors, connected to the working cavities of the main hydraulics an input unit connected to the output of the selector distributor an additional unit of electric control valves connected to the working cavities of the additional hydraulic cylinders and to the input and output of the selector hydraulic distributor, and the steering pump, the shaft of the rotary kinematically connected to the pump shaft of the working equipment characterized in that, in order to reduce energy consumption in the hydraulic actuator, it is equipped with two check valves, the inlet of the first of which {communicates with the drainage line, and the outlet - in the pump inlet left control, with the output of the selector distributor, with the output of the main distributor block and with the inlet of the second check valve, the outlet of which is connected to the inlet of the selector distributor, the selector hydrodistributor being able to communicate in one of its positions of the hydraulic control valve and the output of the main valve block - with drain hydroline.