Hybrid construction machine

A construction machinery and hybrid technology, applied in mechanical equipment, hybrid vehicles, motor vehicles, etc., can solve the problems of increased energy loss of construction machinery, and achieve the goal of suppressing fuel consumption, increasing fuel consumption rate, and improving fuel consumption rate. Effect

Inactive Publication Date: 2011-05-25
SUMITOMO HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, since the excess load on the engine is compensated, the electric energy loss when the battery is discharged, the electric energy loss by the inverter not shown in the figure, the loss in the generator, and the mechanical energy loss in the gears are accumulated, resulting in a loss of the construction machine as a whole. energy loss becomes larger

Method used

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Embodiment Construction

[0044] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0045] First, a hybrid hydraulic excavator will be described as an example of a hybrid construction machine to which the present invention is applied.

[0046] figure 1 A side view of a hybrid hydraulic excavator. On an undercarriage 1 of a hybrid hydraulic excavator, a revolving upper body 3 is mounted via a revolving mechanism 2 . The boom 4 extends from the upper slewing body 3 , and an arm 5 is connected to the front end of the boom 4 . Furthermore, a bucket 6 is connected to the tip of the arm 5 . The boom 4 , stick 5 and bucket 6 are hydraulically driven by the boom cylinder 7 , stick cylinder 8 and bucket cylinder 9 respectively. Furthermore, a cab 10 and a power source (not shown) are mounted on the upper revolving structure 3 .

[0047] figure 2 yes means figure 1 A block diagram showing the structure of the drive system of the hybrid hydraulic excavato...

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Abstract

A hybrid construction machine includes an engine (11), a hydraulic pump (14) driven by the engine (11), an electric motor (12) for assisting drive of the engine (11), and an electricity generator (12) driven by the engine (11) to generate electricity. The speed of the engine (11) is changed according to the magnitude of a load to the engine (11). When the load demanded by the engine (11) is reduced, electricity is generated by the electricity generator (12) to reduce the rotational speed of the engine (11). When the load demanded by the engine (11) is increased, the electric motor (12) is driven to accelerate the engine (11) by assisting the engine (11).

Description

technical field [0001] The present invention relates to construction machines, and more particularly to hybrid construction machines in which the drive of an engine is assisted by an electric motor. Background technique [0002] Construction machinery is mostly hydraulically driven. An example of a hydraulically driven construction machine is a hydraulic excavator. In hydraulic excavators, hydraulic actuators (hydraulic cylinders, hydraulic motors) are generally used to drive the excavator, turn the upper revolving body, and travel the lower traveling body. Generally, many hydraulic pressures supplied to hydraulic actuators are generated by hydraulic pumps that use an engine as a drive source. At this time, the output of the hydraulic drive is determined by the output of the engine. [0003] The work of the hydraulic excavator is not only the work that generally requires 100% of the capacity of the engine, but also many tasks that only need to exhibit the capacity of, for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D29/04B60K6/48B60L11/14E02F9/20F02D29/00F02D29/06B60L50/15B60L50/16
CPCF02D29/06Y02T10/6286B60L2200/26Y02T10/7022B60L2260/54B60W10/06B60K6/48B60L1/003B60L11/005B60W20/00B60K6/20E02F9/2075E02F9/2025B60L2200/40B60L1/20B60W10/30Y02T10/7077B60L11/02F02D29/04E02F9/2246B60W10/08Y02T10/6221B60L50/10B60L50/16B60L50/40E02F9/123Y02T10/62Y02T10/70Y02T10/7072B60W2510/0638B60W2510/0666E02F9/00
Inventor 古贺方土庄野博三大须贺忠男久保隆
Owner SUMITOMO HEAVY IND LTD
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