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Drift-prevention valve device, blade device, and working machine

An anti-drift, valve device technology, used in mechanical equipment, accumulator devices, earth movers/shovels, etc., can solve problems such as difficulty in obtaining proper operation of pistons

Active Publication Date: 2021-05-28
CATEPILLAR SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this configuration, when the piston of the pilot check valve pushes the poppet valve in the valve opening direction, head side pressure and rod side pressure will be applied to the piston, and it is difficult to obtain proper operation of the piston

Method used

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  • Drift-prevention valve device, blade device, and working machine
  • Drift-prevention valve device, blade device, and working machine
  • Drift-prevention valve device, blade device, and working machine

Examples

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Embodiment Construction

[0045] Below, based on Figure 1 to Figure 7 One embodiment shown describes the invention in detail.

[0046] exist Figure 1 to Figure 6 In , reference numeral 10 denotes a working machine. The working machine 10 of the present embodiment will be described by taking a hydraulic excavator-type working machine as an example.

[0047] The machine tool 10 includes a machine body 11 . In the present embodiment, the upper swing body 13 is provided so as to be swingable on the lower travel body 12 . The lower traveling body 12 may be wheeled or tracked, driven by a traveling engine. The upper swing body 13 is driven by a swing motor. The body 11 includes a cab 14 . The cab 14 is mounted on the upper swing body 13 .

[0048] In addition, the working equipment 15 is supported by the machine body 11 . The working equipment 15 includes: a boom whose base is articulated with the upper swing body 13 so as to be freely rotatable in the vertical direction; an arm serving as a rod ar...

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Abstract

To provide a drift-prevention valve device, a blade device, and a working machine capable of operating an actuated unit and preventing the machine body from drifting with a simple configuration. The drift-prevention valve device is provided with a non- return valve 41 that allows the flow of hydraulic oil from a control valve 28 to a head chamber 34h of a blade cylinder 34 and blocks the flow of the hydraulic oil in the reverse direction; and a piston accommodation part 42 separately disposed from an accommodation part 70 of the non-return valve 41, configured to movably accommodate a power piston 43. The power piston 43 defines a first piston chamber 42pl communicating with a rod chamber of 34r of the blade cylinder 34 and a second piston chamber 42p2 for drain positioned on a poppet 71 side of the non- return valve 41 and communicating with a tank 52. The power piston 43 is connected to the poppet 71 of the non-return valve 41, so that the power piston 43 can be operated by the difference between the urging force of the poppet 71 by a spring 72 of the non-retum valve 41 and a rod chamber pressure of the blade cylinder 34.

Description

technical field [0001] The present invention relates to an anti-drift valve device mounted on a fluid pressure cylinder configured to move an actuating unit up and down, a blade device with the anti-drift valve device, and a working machine with the anti-drift valve device. Background technique [0002] Conventionally, among work machines such as hydraulic excavators, some are provided with a blade device for soil removal work. The blade unit can be used as an outrigger, for example, to ground the blade when digging with a bucket and to cause reaction forces from the ground associated with digging to act on the body to make it difficult to tip the body. In the case where the blade unit is used as a leg in this way, it is necessary to prevent the blade cylinder from shrinking and the body from being pinched even if the pipe connected to the blade cylinder is damaged. [0003] There is known a configuration in which, for example, a pilot type switching valve is switched by a ...

Claims

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Application Information

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IPC IPC(8): E02F3/815E02F9/22F15B1/00
CPCE02F9/2267E02F3/815F15B11/003F15B2013/0413F15B2211/30515F15B2211/321F15B2211/329F15B2211/355F15B13/0405F15B2211/3127F15B2211/6355E02F3/964E02F9/085E02F9/2271E02F9/2285F15B13/0401E02F9/2282F15B15/202
Inventor 居本周平喜安浩一前田宏
Owner CATEPILLAR SARL
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