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Work vehicle

A technology for operating vehicles and operating devices, which is applied to motor vehicles, servo motors, mechanically driven excavators/dredgers, etc., can solve problems such as engine application and engine flameout, and achieve the effect of suppressing engine flameout, clear structure and effect

Active Publication Date: 2022-03-11
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of a work vehicle equipped with such an engine, compared with a work vehicle equipped with an engine that does not take measures to reduce fuel consumption, it is easier to apply a load exceeding the engine output torque to the engine, and engine stalls may occur frequently

Method used

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Embodiment Construction

[0022] Hereinafter, as one form of the work vehicle according to the embodiment of the present invention, for example, a wheel loader that performs loading and unloading operations of excavating sand and minerals in an open pit mine and loading them onto a dump truck or the like will be described.

[0023]

[0024] First, refer to figure 1 The overall structure of the wheel loader 1 will be described.

[0025] figure 1 It is an external appearance side view showing a configuration example of the wheel loader 1 according to the embodiment of the present invention.

[0026] The wheel loader 1 is an articulated work vehicle whose body is folded in the center near the center to steer. Specifically, the front frame 110 serving as the front part of the vehicle body and the rear frame 120 serving as the rear part of the vehicle body are connected so as to be rotatable in the left and right directions by the center pin 101, and the rod of the steering cylinder 116 expands and cont...

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PUM

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Abstract

In a work vehicle in which a loading / unloading work device is operated by an electric operating lever, the occurrence of engine stall is suppressed regardless of the type of system mounted on the vehicle body. In a wheel loader (1) provided with a loading / unloading work device (11) operated by an electric operating lever (19), a first directional control valve (5) and a second directional control valve (6) include neutral positions (5N, 6N) at which hydraulic oil discharged from a hydraulic pump (12) is returned to a hydraulic oil tank (10), and when the discharge pressure (P) of the hydraulic pump (12) is at least a main overflow pressure (Pr) and the engine rotation speed (N) is lower than a low idle rotation speed (NL), the hydraulic oil is returned to the neutral positions (5N, 6N). The controller (2, 2A) limits the output of control signals to the first solenoid control valve (3) and the second solenoid control valve (4) such that the first directional control valve (5) and the second directional control valve (6) are switched to neutral positions (5N, 6N).

Description

technical field [0001] The present invention relates to a work vehicle in which a loading and unloading work device is operated by an electric operating lever. Background technique [0002] In a work vehicle including a working device such as a wheel loader, a hydraulic pump that discharges working oil for driving the working device and various other auxiliary machines are driven by an engine. Therefore, when an operation such as releasing the work implement is performed with the engine idling, the sum of the driving torque on the hydraulic pump side and the driving torque on the auxiliary machinery side may exceed the output torque of the engine. When a load exceeding the engine output torque is applied to the engine, the engine stalls. [0003] In addition, in recent years, work vehicles place emphasis on low fuel consumption, and development of technologies for reducing fuel consumption is required. As an example of a method for reducing fuel consumption of a work vehic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F3/28E02F3/36E02F3/42E02F9/20E02F9/22
CPCE02F3/28E02F3/36E02F3/42E02F9/20E02F9/22E02F9/2025E02F9/2083E02F9/2246E02F9/225E02F9/2267E02F9/2282E02F9/2012E02F9/2228E02F3/431F15B2211/20523F15B2211/20538F15B2211/3116F15B2211/50554F15B2211/575F15B2211/6309F15B2211/6346F15B2211/665F15B2211/67F15B21/087F15B11/0423F15B13/0433F15B2211/327F15B2211/329F15B2211/633E02F9/2285F15B11/028F15B11/08B60Y2200/415E02F3/283E02F9/26F15B15/20
Inventor 宫本泰典田中哲二
Owner NIHON KENKI CO LTD
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