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Hydraulic control circuit for an articulation assembly

A control circuit and valve assembly technology, applied in servo meter circuits, fluid pressure actuators, mechanically driven excavators/dredgers, etc., can solve the problems of small articulation degree and difficulty in maintaining articulation degree accurately

Active Publication Date: 2019-10-18
DEERE & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under manual control, it can be difficult to precisely maintain the desired degree of articulation
For example, it can be difficult to keep a work vehicle in a straight line even with a small degree of articulation

Method used

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  • Hydraulic control circuit for an articulation assembly
  • Hydraulic control circuit for an articulation assembly
  • Hydraulic control circuit for an articulation assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] figure 1 A work vehicle is shown, which in the illustrated embodiment is a motor grader (or simply "motor grader") 10 . Motor grader 10 includes a chassis 14 having a front frame 18 and a rear frame 22 . The front frame 18 supports a cab 26 which may include an operator seat, controls for operating the motor grader 10, and the like. A prime mover 30 (eg, a diesel engine) is supported on the rear frame 22 and enclosed within a compartment 34 . Chassis 14 is supported by front wheels 38 at the front of motor grader 10 and dual-wheel or tandem rear wheels 42 at the rear of motor grader 10 .

[0012] Motor grader 10 includes a hoop 46 disposed forward of cab 26 and suspended below front frame 18 by lifter bracket 50 and drawbar 54 . A work implement, which in the illustrated embodiment is a blade 58 or a moldboard, extends transversely through circle 46 . Motor grader 10 includes blade positioning assembly 62 that allows the position and orientation of blade 58 to be ad...

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PUM

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Abstract

A work vehicle includes a first frame, a second frame pivotally coupled to the first frame at an articulation joint, and a control circuit operable to control relative movement of the first and secondframes about the articulation joint. The control circuit includes a pump, an actuator in fluid communication with the pump, and a first valve assembly coupled to a user-manipulable control. The firstvalve assembly is configured to direct fluid from the pump to the actuator in response to movement of the user-manipulable control to pivot the first and second frames. The control circuit also includes a second valve assembly configured to direct fluid from the pump to the actuator in response to receiving an electronic control signal to pivot the first and second frames.

Description

technical field [0001] The present invention relates to hydraulic control circuits, and more particularly to a hydraulic control circuit for an articulation assembly of a work vehicle. Background technique [0002] Many work vehicles include front and rear frames coupled together by articulating joints to reduce the turning radius of the vehicle and thereby improve maneuverability or maneuverability. The articulation joint may be passive or may be part of an active articulation assembly. Active articulation assemblies typically include one or more actuators to control the degree of articulation between the front and rear frames. One or more actuators may be manually controlled. Under manual control, one or more actuators rotate the front frame relative to the rear frame in response to steering input (eg, provided through user manipulation of the steering control). However, under manual control, it may be difficult to precisely maintain the desired degree of articulation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F3/76E02F3/85E02F9/08
CPCE02F3/7636E02F3/764E02F3/7645E02F3/765E02F3/84E02F3/844E02F9/0841F15B2211/30565F15B2211/324F15B2211/327F15B2211/6346E02F9/225F15B11/16F15B2211/6306F15B2211/7053F15B2211/7107F15B2211/35
Inventor 亚当·泽尔
Owner DEERE & CO