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Pressure loss reducing circuit for a works machine

A pressure and machine technology applied in the field of pressure loss reduction circuits for work machines that can solve problems such as reduction in actuator operating speed, increase in return oil pressure loss, and reduction in fuel efficiency

Inactive Publication Date: 2015-12-02
CATEPILLAR SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Increased pressure loss of return oil across the switching spool of the directional switching valve due to increased oil volume
Therefore, in a work machine that performs work by frequently operating a large number of cylinders, there are problems in that since the pressure increases on the supply side in order to compensate for the pressure loss, the operating speed of the actuator decreases, the work efficiency deteriorates, and the fuel efficiency decreases.

Method used

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  • Pressure loss reducing circuit for a works machine
  • Pressure loss reducing circuit for a works machine
  • Pressure loss reducing circuit for a works machine

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Embodiment Construction

[0023] Hereinafter, a pressure loss reducing circuit of a work machine configured according to the present invention will be described in more detail with reference to the accompanying drawings showing preferred embodiments.

[0024] First, a hydraulic excavator as a typical example of a work machine to which a pressure loss reduction circuit is applied will be described with reference to FIG. 6 . The hydraulic excavator 70 includes a lower traveling structure 72 and an upper rotating structure 74 on which a working arm arrangement 76 having a plurality of hydraulic actuators is disposed.

[0025] The working arm assembly 76 includes a boom 76a attached to the upper rotating structure 74 for swinging in a vertical direction, an arm 76b attached to a distal end of the boom 76a for swinging in a vertical direction, and a distal end of the arm 76b for swinging. The bucket 76c swings vertically. The working arm device 76 further includes a boom cylinder 76d as an actuator for swi...

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PUM

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Abstract

A pressure loss reducing circuit reduces a pressure loss of oil returning from an actuator to a direction switching valve with a simple configuration while suppressing an increase in the manufacturing cost and substantially eliminating the need of an additional installation space. The pressure loss reducing circuit includes a bypass valve (16) disposed between an actuator oil path (10) and a tank oil path (14) of a direction switching valve (2), and opened and closed according to a signal from a controller (8), and moreover screwed into and attached to the direction switching valve (2) According to an operation signal of a switching spool (2a) when oil returning from an actuator (4) is caused to flow to the actuator oil path (10), the controller (8) opens the bypass valve (16) so that the actuator oil path (10) and the tank oil path (14) communicate with each other and supplies the returning oil to the switching spool (2a) and the bypass valve (16) to reduce a pressure loss.

Description

technical field [0001] The present invention relates to a circuit for reducing the pressure loss of hydraulic oil returning from a hydraulic actuator to a directional switching valve. Background technique [0002] Work machines (hydraulic excavators as a typical example) include a large number of actuators such as oil cylinders to perform work. The actuator is operated using oil pumped from a pump and supplied by a directional switching valve operated by an operator. [0003] When the oil pumped from the pump is supplied to the rod side of the cylinder through the direction switching valve, and the discharged oil on the head side is returned to the direction switching valve, due to the difference in cross-sectional area on the rod side and the head side of the cylinder The difference, the amount of returned oil per unit time in relation to the amount of supplied oil is amplified and increased. Also, when the return oil is pushed by the weight of the load applied to the cyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22F15B11/044
CPCE02F9/2203E02F9/2235E02F9/2267E02F9/2296F15B11/044F15B2211/40515F15B2211/4159F15B2211/426F15B2211/46F15B2211/50518F15B2211/513F15B2211/5156F15B2211/5159F15B2211/526F15B2211/6346F15B11/165F15B21/08F15B2211/205F15B2211/25
Inventor 金绳裕也居本周平峰元太安富雄大横山裕
Owner CATEPILLAR SARL