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Work machine

A technology of working machinery and prime mover, which is applied to mechanical equipment, earth movers/excavators, servo motors, etc., can solve problems such as waste of energy, and achieve the effects of reducing energy, maintaining operability, and good operability

Pending Publication Date: 2021-10-22
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, even when the hydraulic actuator is not driven, the pilot hydraulic pump supplies hydraulic oil according to the rotation speed of the engine, so there is a problem of wasting energy

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0038] figure 1 It is a side view which shows the hydraulic excavator of 1st Embodiment. The hydraulic excavator 1 of the present embodiment includes a traveling body 2 that travels by driving the crawler belts provided on the left and right side portions, respectively, and a rotating body 3 rotatably provided on the upper portion of the traveling body 2 . The revolving body 3 has a cab 4 , a machine room 5 , a counterweight 6 , and a working machine 7 . The cab 4 is provided on the left side of the rotating body 3 . The machine room 5 is provided behind the cab 4 . The counterweight 6 is provided behind the machine room 5 , that is, at the rearmost part of the rotating body 3 .

[0039] The work machine 7 has a boom 8 , an arm 9 , a bucket 10 , a boom cylinder 11 a for driving the boom 8 , an arm cylinder 11 b for driving the arm 9 , and a bucket cylinder for driving the bucket 10 11c. The base end portion of the boom 8 is rotatably attached to the front portion of the r...

no. 2 approach

[0067] Below, refer to Figure 9 as well as Figure 10 A second embodiment of the working machine will be described. The hydraulic excavator of the present embodiment is different from the above-described first embodiment in that the pilot hydraulic pump is driven by the electric motor and in the structure of the control device. The other structures are the same as those of the first embodiment, so repeated descriptions are omitted.

[0068] Figure 9 It is a block diagram which shows the system of the hydraulic excavator of 2nd Embodiment. In the present embodiment, the pilot hydraulic pump 18 is a fixed-capacity hydraulic pump driven by an electric motor 31, the electric motor 31 is driven by a battery 32, and its rotational speed is controlled in accordance with a control command from the control device 15A. The electric motor 31 and the battery 32 are arranged inside the machine room 5 , for example.

[0069] Figure 10 It is a block diagram showing a control device ...

no. 3 approach

[0073] Below, refer to Figure 11 to Figure 15 A third embodiment of the working machine will be described. The hydraulic excavator of the present embodiment differs from the above-described first embodiment in that the operating device is an electric lever, and in that it further includes an electromagnetic proportional valve. The other structures are the same as those of the first embodiment, so repeated descriptions are omitted.

[0074] Figure 11 It is a block diagram which shows the system of the hydraulic excavator of 3rd Embodiment. The operating device 14A of the present embodiment is an electric lever, and includes a boom operating lever, an arm operating lever, a bucket operating lever, a swing operating lever, a right travel operating lever, and a left traveling operating lever. The boom operation lever outputs the boom lowering operation amount and the boom raising operation amount to the control device 15B, the arm operation lever outputs the arm unloading ope...

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Abstract

A hydraulic excavator (1) is provided with: an engine (16); a main hydraulic pump (17) driven by the engine (16); a plurality of hydraulic actuators driven by hydraulic oil discharged from the main hydraulic pump (17); a plurality of flow control valves controlling the flow of hydraulic oil supplied to the hydraulic actuator from the main hydraulic pump (17); a pilot hydraulic pump (18) supplying hydraulic oil for driving the flow control valves; and a control device (15) controlling the discharge flow of the pilot hydraulic pump (18). The control device (15) controls the discharge flow of the pilot hydraulic pump (18) to a sum of a required pilot flow determined according to a control instruction to the flow control valve and a preset standby flow. k machine A hydraulic excavator (1) is provided with: an engine (16); a main hydraulic pump (17) driven by an engine (16); a plurality of hydraulic actuators driven by hydraulic oil discharged from the main hydraulic pump (17); a plurality of flow control valves controlling the flow of hydraulic oil supplied to the hydraulic actuator from the main hydraulic pump (17); a pilot hydraulic pump (18) supplying hydraulic oil for driving the flow control valves; and a control device (15) controlling the discharge flow of the pilot hydraulic pump (18). The control device (15) controls the discharge flow of the pilot hydraulic pump (18) to a sum of a required pilot flow determined according to a control instruction to the flow control valve and a preset standby flow.

Description

technical field [0001] The present invention relates to work machines. [0002] This application claims priority based on Japanese Patent Application No. 2019-174623 for which it applied on September 25, 2019, and the content is incorporated herein by reference. Background technique [0003] As a work machine, there is known a hydraulic excavator including a main hydraulic pump for supplying hydraulic oil for driving a hydraulic actuator, a flow control valve for controlling the flow rate of the hydraulic oil supplied to the hydraulic actuator, and a flow rate supply for driving the hydraulic actuator. Pilot hydraulic pump that controls the hydraulic oil of the valve. In such a working machine, a main hydraulic pump and a pilot hydraulic pump are usually driven by a single engine (that is, a prime mover), and the pilot hydraulic pump is a fixed-capacity hydraulic pump. Furthermore, even when the hydraulic actuator is not driven, the pilot hydraulic pump supplies hydraulic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/17F15B13/08F15B13/042F15B13/044F15B13/02E02F9/22
CPCF15B11/17F15B13/08F15B13/042F15B13/025E02F9/22E02F9/2264E02F9/2285E02F9/2267F15B2211/88F15B2013/0448F15B2211/67F15B2211/8646E02F9/2228E02F9/2235E02F9/2075F15B2211/329F15B2211/355F15B2211/6355F15B2211/635F15B2211/20546F15B13/0433F15B11/16F15B2211/30525F15B11/162F15B11/166F15B21/087F15B13/0422F15B13/0424F15B2211/20523F15B2211/20515F15B2211/20538F15B2211/20576F15B2211/265F15B2211/523F15B2211/526F15B2211/575F15B2211/633F15B2211/6346F15B2211/6333F15B2211/71F15B2211/7135F15B2211/7142F15B2211/78F15B2211/781F15B2211/6652F15B2211/6651F15B11/08F15B2211/20553E02F9/2296
Inventor 千叶孝昭熊谷贤人今井勇佑
Owner NIHON KENKI CO LTD
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