Land leveller traveling hydraulic driving system with parallel connection of double pumps and double motors

A drive system and motor grader technology, which is applied to earth movers/excavators, construction, etc., can solve the problems of difficult realization and lack of natural differential speed, and achieve the effect of convenient operation, simple structure and easy realization

Active Publication Date: 2016-09-28
GAOYUAN HIGHWAY MAINTENANCE TECH HENAN PROV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Driven independently by two single-pump and single-motor circuits, it is easy to achieve synchronization through control, but the vehicle does not have natural differential speed when turning. Complicated control to distribute the steering flow of the motors on both sides, which is difficult to achieve

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  • Land leveller traveling hydraulic driving system with parallel connection of double pumps and double motors

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Embodiment Construction

[0026] The present invention is described in further detail below in conjunction with accompanying drawing:

[0027] refer to figure 1 , the motor grader driving hydraulic drive system with two pumps and two motors in parallel according to the present invention includes a transfer case 1, a fuel tank, two single-pump and single-motor closed hydraulic circuits, a first two-position two-way solenoid valve 111 and a second two-way solenoid valve 111. Two-position two-way solenoid valve 112; two single-pump single-motor closed-type hydraulic circuits include travel pump 2, pump swash plate control hydraulic cylinder 3, first electric proportional valve 41, second electric proportional valve 42, first safety overflow Valve 61, second safety relief valve 62, relief valve 63, charge relief valve 64, shuttle valve 7, charge pump 13, flushing valve 9, motor variable control hydraulic cylinder 12 and travel variable motor 8; transfer case The output shaft of 1 is connected with the dri...

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Abstract

The invention discloses a land leveller traveling hydraulic driving system with parallel connection of double pumps and double motors. The system comprises a transfer case, an oil tank, two single-pump single-motor closed hydraulic loops and a first two-position two-way solenoid valve as well as a second two-position two-way solenoid valve; the two single-pump single-motor closed hydraulic loops respectively comprise a traveling pump, a pump tilting tray control hydraulic cylinder, a first electric proportional valve, a second electric proportional valve, a first safety overflow valve, a second safety overflow valve, an overflow valve, an oil supplementing overflow valve, a shuttle valve, an oil supplementing pump, a flush valve, a motor variable control hydraulic cylinder and a traveling variable motor. The system is simple in structure and can realize stepless speed change, free veering and synchronous control.

Description

technical field [0001] The invention belongs to the technical field of transmission and control of construction machinery, and relates to a driving hydraulic drive system of a grader with two pumps and two motors connected in parallel. Background technique [0002] A grader is a construction machine that uses a blade as the main working device and is equipped with other replaceable auxiliary working devices to complete land leveling and shaping. [0003] At present, the drive system of motor grader mainly has three forms: mechanical transmission, hydraulic transmission and hydrostatic transmission. Among them, the mechanical grader adopts the direct transmission of the gearbox, which has high transmission efficiency, but the structure is complex, the gearbox is difficult to manufacture and the manufacturing cost is high, and it is not easy to realize automatic transmission, let alone continuously variable transmission; the hydraulic grader has a strong Excellent load self-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
CPCE02F9/225E02F9/2253E02F9/2292
Inventor 王欣张志友王瑜赵睿英
Owner GAOYUAN HIGHWAY MAINTENANCE TECH HENAN PROV
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