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Hybrid construction machine

A construction machinery and hybrid technology, applied in hybrid vehicles, fluid hybrid vehicles, power units, etc., can solve the problems of insufficient torque of the upper rotating body, workability (decreased workability, inability to obtain a sense of operation, etc.) Achieving a good sense of operation and work ability, ensuring the effect of operation sense and work ability

Active Publication Date: 2012-10-03
HITACHI CONSTRUCTION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the technologies described in Patent Documents 1 to 3, when it is necessary to stop the function of the motor due to a failure of the motor, an abnormal voltage of the power storage device, or other reasons, the hydraulic motor alone is used to drive the upper rotating body. Insufficient torque (rotational torque) not only fails to obtain a good operating feeling, but also reduces workability (workability)

Method used

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no. 1 approach

[0112] ~Structure of Hydraulic Excavator~

[0113] figure 1 A side view of the hybrid hydraulic excavator according to the first embodiment of the present invention is shown.

[0114] exist figure 1 Among them, the hybrid hydraulic excavator includes: an undercarriage 10 ; an upper revolving unit 20 rotatably provided on the undercarriage 10 ; and an excavating mechanism 30 .

[0115] The undercarriage body 10 consists of a pair of crawler belts 11a, 11b and crawler frames 12a, 12b (in figure 1 Only one side is shown in the figure), a pair of right and left traveling hydraulic motors 13, 14 for independently driving and controlling each crawler belt 11a, 11b, and a reduction mechanism thereof.

[0116] The upper rotating body 20 is composed of the following components: a rotating frame 21; an engine 22 as a prime mover installed on the rotating frame 21; a generator 23 driven by the engine 22; for storing the electric power generated by the generator 23 The electric motor ...

no. 2 approach

[0176] use Figure 16 A hybrid hydraulic excavator according to a second embodiment of the present invention will be described. In this embodiment, when the electric motor 25 for turning is not driven, in order to increase the braking torque, the combined throttling of the meter-out part of the direction and flow control valve 37 and the throttle part of the auxiliary valve is used to make the hydraulic pressure for turning The meter-out pressure rise of the motor is controlled.

[0177] Figure 16 It is a figure which shows the detail of the rotary hydraulic system of the hydraulic circuit apparatus concerning 2nd Embodiment of this invention. In the figure, for Figure 1 ~ Figure 3 The same structural elements are assigned the same reference signs.

[0178] exist Figure 16 In, instead of the first embodiment's image 3 The electromagnetic proportional pressure reducing valves 71 and 72 shown, the rotary hydraulic system has a meter-out auxiliary valve 44 and an electr...

no. 3 approach

[0182] use Figure 17 ~ Figure 19 A hybrid hydraulic excavator according to a third embodiment of the present invention will be described. In this embodiment, in order to increase the driving torque of the hydraulic motor 27 for swing when the electric swing motor 25 is not driven, the bypass throttle portion of the direction and flow control valve 37 is controlled in the closing direction, thereby making the The rotation is controlled so that the meter-in pressure of the hydraulic motor 27 increases.

[0183] Figure 17 It is a figure which shows the detail of the rotary hydraulic system of the hydraulic circuit apparatus concerning 3rd Embodiment of this invention. In the figure, for Figure 1 ~ Figure 3 The same structural elements are assigned the same reference signs.

[0184] exist Figure 17 , instead of the first embodiment image 3 The shown intermediate bypass reversing valve 38, controller 51, operating device 52, pressure sensors 53a, 53b, electromagnetic pro...

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PUM

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Abstract

Provided is a hybrid construction machine (driving the upper swing structure (20) using a hydraulic motor (27) and an electric motor (25) together) capable of regenerating the energy of the upper swing structure (20) in deceleration or stopping into electric power and using the regenerated electric power for assisting the driving of the upper swing structure (20), while also being capable of securing satisfactory operational feeling and operation capability even when the electric motor (25) does not operate. When the electric motor (25) is not driven, a controller (51) controls a hydraulic circuit system (40) (specifically, a swing direction / flow rate control valve (42), a center bypass cut valve and a regulator) so as to increase output torque of the hydraulic motor (27) by an amount corresponding to torque to be compensated for the non-driving of the electric motor (25) compared to cases where the electric motor (25) is driven.

Description

technical field [0001] The invention relates to a hybrid construction machine, in particular to a hybrid construction machine that drives an upper rotating body through a hydraulic motor and an electric motor. Background technique [0002] Conventionally, in the field of construction machinery, hydraulic actuators have been widely used because they can reduce the size and weight of equipment while maintaining output. However, in recent years, in order to improve energy efficiency, construction machines equipped with electric actuators have been proposed and some of them have been put into practical use. In particular, since the actuator that rotates the upper revolving body of the construction machine relative to the lower traveling body is a rotary actuator with a large inertial load, and is used frequently, it is frequently started and stopped, so it can be expected that the upper revolving body will stop. Energy recovery, so when an electric actuator is used as a rotary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F3/04E02F3/42E02F9/20E02F9/22
CPCE02F9/2095E02F9/2235E02F9/2075Y02T10/6282B60W2300/17B60K6/12E02F9/2217B60K6/48Y02T10/6208E02F9/123E02F9/2296Y02T10/6221Y02T10/62B60R16/033E02F9/20E02F9/22
Inventor 大木孝利佐竹英敏石川广二西川真司
Owner HITACHI CONSTRUCTION MACHINERY CO LTD
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