Construction machinery

A technology for construction machinery and work, which is applied in the direction of mechanical equipment, soil movers/shovels, fluid pressure actuators, etc., can solve problems such as the timing of regeneration and use of energy that does not involve energy, so as to extend the operating time and reduce fuel consumption. Consumption, productivity improvement effect

Active Publication Date: 2014-10-15
NIHON KENKI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Although the above patent document 1 discloses an energy recovery/regeneration dev

Method used

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  • Construction machinery
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Example Embodiment

[0032] Example 1

[0033] in figure 1 Among them, the electric hydraulic excavator includes a traveling body 40, a rotating body 50 rotatably provided on the traveling body 40, and an excavating mechanism 60 mounted on the rotating body 50.

[0034] The excavating mechanism 60 is composed of a boom 61, a boom hydraulic cylinder 6 for driving the boom 61, an arm 62 rotatably pivotally supported near the tip of the boom 61, an arm hydraulic cylinder 64 for driving the arm 62, A bucket 63 rotatably supported at the tip of the arm 62 and a bucket hydraulic cylinder 65 for driving the bucket 63 are configured.

[0035] A prime mover chamber 51 that houses an engine, a main pump, etc., described later, is provided at the rear of the rotating body 50.

[0036] Next, use figure 2 To explain the system structure of the electric / hydraulic equipment of the hydraulic excavator. In addition, in this embodiment, as an actuator, the boom hydraulic cylinder 6 is described as an example. figure 2 I...

Example Embodiment

[0096] According to the first embodiment of the construction machine of the present invention described above, it is possible to provide a construction machine that can reduce the power of the engine 1 as the power source by efficiently using the recovered energy, and greatly reduce the overall fuel consumption of the construction machine. As a result, the operating time of construction machinery is extended, so productivity is improved.

[0097] In addition, in this embodiment, Figure 5 The case where the change in the target value of the discharge flow rate of the hydraulic pump motor 9 and the main pump 3 is designed in a stepwise manner is shown, but it is not limited to this. For example, it can also be changed smoothly.

[0098] In addition, when the discharge pressure fluctuates greatly, the controller 20 may also use the discharge pressure signal after averaging processing (low-pass filter processing) in order to prevent the drive / stop driving of the hydraulic pump motor 9...

Example Embodiment

[0099] Example 2

[0100] Hereinafter, the second embodiment of the construction machine of the present invention will be described using the drawings. Picture 9 It is a system configuration diagram of electric / hydraulic equipment constituting the second embodiment of the construction machine of the present invention. in Picture 9 In, and Figure 2 to Figure 8 The same reference numerals in the shown reference numerals denote the same parts, and therefore detailed descriptions thereof are omitted.

[0101] Picture 9 The illustrated second embodiment of the construction machine of the present invention is composed of substantially the same equipment as the first embodiment, but the following structure is different.

[0102] In the first embodiment, the hydraulic oil supply circuit 10 is constituted by the switching valve 11c as the hydraulic oil switching unit, and the direction of the hydraulic oil discharged from the hydraulic pump motor 9 is controlled in accordance with the co...

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Abstract

Construction machinery is provided which can significantly reduce fuel consumption through the efficient use of recovered energy. The construction machinery includes: a first hydraulic pump (3) and a second hydraulic pump (9) for discharging hydraulic fluid to operate an actuator (6); a second power source (7) for driving the second hydraulic pump (9); an energy storage means (8) for storing energy to drive the second power source (7); and a hydraulic fluid supply circuit (10) with a hydraulic fluid switching unit (11c) for receiving hydraulic fluid discharged from the first hydraulic pump (3) and hydraulic fluid discharged from the second hydraulic pump (9), and selecting one or both sources of hydraulic fluid to be supplied to the actuator (6). The construction machinery also includes a control device (20) for outputting switching instructions to the hydraulic fluid switching unit (11c) and for outputting drive instructions to the second power source (7) when the drive efficiency of the second hydraulic pump (9) and/or the amount of energy stored in the energy storage means (8) exceeds a predetermined set value.

Description

technical field [0001] The present invention relates to engineering machinery, in particular to an engineering machinery with two or more hydraulic pumps for supplying working hydraulic oil to an actuator. Background technique [0002] Generally, a hydraulic excavator as one of construction machines has: a prime mover such as an engine; a hydraulic pump driven by the prime mover; and a boom, an arm, a bucket, and a rotating body driven by hydraulic oil discharged from the hydraulic pump. and other hydraulic actuators; and the control valve that switches the supply of hydraulic oil from the hydraulic pump to the hydraulic actuator. For this kind of construction machinery, a technology has been proposed to reduce the power of the power source and reduce the fuel consumption of the entire construction machinery, which recovers the potential energy of the boom falling due to its own weight and the inertial kinetic energy of the rotating body to effectively use it. [0003] For ...

Claims

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Application Information

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IPC IPC(8): F15B11/00E02F9/20F15B11/02F15B21/14
CPCF15B2211/88E02F9/2217F15B2211/20569E02F9/2242E02F9/2292F15B2211/20546F15B2211/41518F15B2211/31558F15B11/02F15B2211/20576F15B2211/20515E02F9/2296F15B11/00F15B21/14E02F9/2095E02F9/20E02F9/2075F15B11/024F15B15/14F15B2211/2053
Inventor 井村进也佐竹英敏石川广二土方圣二金田朋晃
Owner NIHON KENKI CO LTD
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