Hydraulic system for work vehicle

一种作业车辆、液压系统的技术，应用在液压系统领域，能够解决阀组件大型化成本、装置结构复杂化等问题

Inactive Publication Date: 2006-11-01
KUBOTA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, only by opening and closing the cock valve, it is not possible to switch to one of the two states of the confluence of the pressure oil from the auxiliary hydraulic pump to the pressure oil from the main hydraulic pump and the discharge into the oil tank, and the device structure is also difficult. Unnecessarily complicated, there is a problem of increasing the size and cost of the valve assembly

Method used

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  • Hydraulic system for work vehicle
  • Hydraulic system for work vehicle
  • Hydraulic system for work vehicle

Examples

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Embodiment Construction

[0031] Below, according to Figure 1 to Figure 9 Embodiments of the present invention will be described in detail.

[0032] Such as Figure 8 as well as Figure 9 As shown, the backhoe 1 of the present embodiment includes a lower traveling device 2 and an upper rotating body 3 .

[0033] The traveling device 2 includes a pair of left and right traveling bodies including rubber crawlers 4 and a traveling motor 5 that drives the rubber crawlers 4 . In this embodiment, a crawler-type traveling device is used.

[0034] Further, a dozer blade 7 operable by a blade pressure cylinder 6 is provided at the front portion of the traveling device 2 .

[0035] The rotating body 3 includes: a rotating table 12 supported above the traveling device 2 through a rotating bearing 11 so as to be rotatable about a rotating axis X in the vertical direction; Middle is excavation device) 13. Further, the turntable 12 is provided with a hydraulic turn motor 14 for turning the turntable 12 around...

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Abstract

The hydraulic system (40) for a work vehicle includes a main hydraulic pump (p1), a main supply circuit (M) through which pressurized oil from the main hydraulic pump flows, a sub hydraulic pump (p2), and a sub supply circuit (S) through which pressurized oil from the sub hydraulic pump flows. The main supply circuit supplies pressurized oil to a hydraulic travel motor (5L,5R) that drives a travel device (2) and a service actuator (27) that is disposed in an attachment with which the work vehicle is detachably furnished. The sub supply circuit merges with the main supply circuit and supplies pressurized oil to the service actuator. The hydraulic system for a work vehicle further includes a flow amount adjustment valve (v11) that adjusts the flow amount of the pressurized oil from the sub supply circuit that merges with the main supply circuit.

Description

technical field [0001] The invention relates to a hydraulic system of working vehicles such as backhoes. Background technique [0002] Conventionally, work vehicles such as backhoes have been equipped with a pair of left and right hydraulic travel motors, a plurality of hydraulic cylinders, auxiliary oil ports capable of supplying pressure oil to actuators (auxiliary actuators) of externally detachable attachments, etc. , and have a hydraulic system that can make these hydraulic actuators act simultaneously, and the hydraulic system has: an oil tank for storing pressure oil; a main hydraulic pump and an auxiliary hydraulic pump that can be driven by an engine; connecting these hydraulic devices, hydraulic pumps, and oil tanks There are multiple supply circuits, and the supply circuits are switched according to the working conditions, so as to supply an appropriate amount of pressure oil to each hydraulic actuator. [0003] Among such hydraulic systems, there is known a syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
CPCE02F9/2239E02F9/2292
Inventor 堀井启司
Owner KUBOTA CORP
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