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Hydraulic systems for construction equipment

A technology for hydraulic systems and construction equipment, applied in the field of hydraulic systems, can solve problems such as reducing combined operability, and achieve the effects of improving operability, increasing fuel ratio, and improving working ability

Inactive Publication Date: 2016-06-22
VOLVO CONSTR EQUIP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is almost impossible to operate an attachment such as a swing arm, thereby reducing combined operability

Method used

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  • Hydraulic systems for construction equipment
  • Hydraulic systems for construction equipment

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Embodiment Construction

[0064] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Matters defined in the specification, such as detailed structures and elements, are merely specific details to help those skilled in the art fully understand the present invention, and the present invention is not limited to the embodiments disclosed hereinafter.

[0065] like figure 2 As shown, a hydraulic system for construction equipment according to an embodiment of the present invention includes:

[0066] A variable displacement hydraulic pump 1 (hereinafter referred to as "hydraulic pump"), which is connected to an engine (not shown);

[0067] An attachment operating device (actuator joystick) 2 and a rotary operating device (rotary joystick) 3 that output an operation signal proportional to an operator's operation amount;

[0068] At least one accessory actuator 5 (only one accessory actuator is shown in the figures, but hydrauli...

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PUM

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Abstract

The invention discloses a hydraulic system provided with a pressure compensation valve, comprising: a hydraulic pump; a control device for working equipment and rotary motion; an actuator for working equipment; connected to the hydraulic pump; a first control valve for controlling the working fluid supplied to the actuator; a second control valve for controlling the working fluid supplied to the swing motor; a check valve for installed into the flow path; a first pressure compensation valve; a second pressure compensation valve; a maximum load pressure sensor for sensing the pressure of the maximum load sensing pressure line; and a control section for controlling the outlet flow of the hydraulic pump . During the combined operation of the swing motion and the work equipment, the load pressure on the side of the swing motion is not transmitted to the first pressure compensation valve on the work equipment side.

Description

technical field [0001] The invention relates to a hydraulic system for construction equipment. More particularly, the present invention relates to a hydraulic system for construction equipment having a pressure compensating valve that can improve operability when combined operations of a swing unit and an attachment are performed. Background technique [0002] Such as figure 1 As shown, hydraulic systems for construction equipment in the prior art include: [0003] A variable displacement hydraulic pump 1 (hereinafter referred to as "hydraulic pump"), which is connected to an engine (not shown); [0004] Attachment operating device 2 and rotary operating device 3, which output an operating signal proportional to the operator's operating amount; [0005] at least one accessory actuator 5 connected into the discharge flow path 4 of the hydraulic pump 1 , wherein said accessory actuator 5 is driven by operating the accessory operating device 2 ; [0006] a swing motor 7, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02E02F9/22G05D16/08G05G9/047
CPCE02F9/2228E02F9/2235E02F9/2285E02F9/2296F15B2211/605F15B2211/6309F15B2211/6313F15B2211/6316F15B2211/65F15B2211/7058F15B2211/7135E02F9/123F15B11/165F15B2211/20546F15B2211/253F15B2211/651F15B2211/6652E02F3/36E02F9/12E02F9/20F15B11/055F15B2211/25F15B2211/78
Inventor 裵相基李在勋
Owner VOLVO CONSTR EQUIP AB
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