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Overload prevention device for construction machine

A construction machinery and anti-overload technology, applied in construction, mechanical equipment, control devices, etc., can solve the problems of increased fuel injection volume, engine loading and deceleration, etc., to eliminate engine loading and deceleration, reduce fuel consumption, and improve operability Effect

Active Publication Date: 2013-08-28
SUMITOMO CONSTRUCTION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although suppressed to a lesser extent, engine load deceleration still occurs, resulting in increased fuel injection quantity

Method used

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  • Overload prevention device for construction machine
  • Overload prevention device for construction machine
  • Overload prevention device for construction machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] Hereinafter, an overload prevention device for a construction machine according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0040] figure 1 It is a figure which shows the hydraulic circuit of the overload prevention device of the construction machine which concerns on one Embodiment of this invention. figure 2 yes means figure 1 The torque characteristic diagram of the relationship between the secondary pressure of the electromagnetic inverse proportional valve and the pump input torque of the embodiment. image 3 yes means figure 1 The timing diagram of each characteristic in the embodiment. In addition, in figure 1 Neutral to and Figure 7 The structural elements that are the same as the shown structural elements are marked with the same symbols, and repeated explanations are omitted.

[0041] As described above, in order to prevent engine load deceleration from occurring when the discharge press...

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PUM

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Abstract

In an over-loading prevention device including a hydraulic pump, a control valve, and a control lever, a discharge-quantity control unit performs constant-torque control which decreases a discharge quantity in proportion to an increase in a discharge pressure in the pump to control an input torque of the pump uniformly. An operation-state detection unit detects an actuation state of the control lever. A control unit outputs a control signal that sets the pump input torque to a minimum torque according to the constant-torque control, to the discharge-quantity control unit when the control lever is operated over a predetermined speed, and subsequently changes a level of the control signal to a maximum torque according to the constant-torque control in accordance with a predetermined control pattern to raise the pump input torque.

Description

technical field [0001] The present invention relates to an anti-overload device for a construction machine, and in particular to an anti-overload device for a construction machine capable of reducing fuel consumption during various operations in construction machines such as a hydraulic shovel using an internal combustion engine as a drive system. Background technique [0002] Existing overload protection devices for construction machinery, such as Figure 7 Hydraulic pump-driven controls shown. [0003] exist Figure 7 In the hydraulic pump-driven control device of the present invention, a variable displacement hydraulic pump (main pump) 2 and a pilot pump 3 driven by an engine (internal combustion engine) 1 are provided. The discharge port of the variable displacement hydraulic pump 2 faces an unillustrated hydraulic actuator and communicates with a control valve 4 for controlling supply and discharge of hydraulic pressure from the variable displacement hydraulic pump 2 . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/00F02D29/00E02F9/22F02D29/04
CPCE02F9/2285F15B2211/6316E02F9/2235F15B2211/20553E02F9/2228F15B2211/6346F15B2211/20523E02F9/226F15B2211/633F02D29/04E02F9/2296F15B2211/26B60K17/00E02F9/22F02D29/00F15B11/00
Inventor 塚本浩之西贵志
Owner SUMITOMO CONSTRUCTION MACHINERY
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