US 10,562,564 B2 · Work vehicle

Abstract

A work vehicle is articulated with a front frame and a rear frame linked to the front frame. The work vehicle includes a hydraulic actuator, a control valve, an operation member and a force imparting component. The hydraulic actuator is configured to be hydraulically driven to change a steering angle of the front frame with respect to the rear frame. The control valve is configured to control flow of fluid supplied to the hydraulic actuator. The operation member is linked to the control valve and configured to be operated by an operator. The force imparting component is configured to impart an assist force or a counterforce to an operation of the operation member.

Claims12

Dependent claims

A work vehicle, the work vehicle being articulated with a front frame and a rear frame linked to the front frame, the work vehicle comprising:

a hydraulic actuator configured to be hydraulically driven and to change a steering angle of the front frame with respect to the rear frame;
a control valve configured to control flow of fluid supplied to the hydraulic actuator;
an operation member linked to the control valve and configured to be operated by an operator;
and
a force imparting component configured to impart an assist force or a counterforce to an operation of the operation member, the force imparting component including an electric motor as a drive source thereof.

2 more elements

A work vehicle, the work vehicle being articulated with a front frame and a rear frame linked to the front frame, the work vehicle comprising:

a hydraulic actuator configured to be hydraulically driven and to change a steering angle of the front frame with respect to the rear frame;
a control valve configured to control flow of fluid supplied to the hydraulic actuator;
an operation member linked to the control valve and configured to be operated by an operator;
and
a force imparting component configured to impart an assist force or a counterforce to an operation of the operation member,
the control valve including
a first input member linked to the operation member and displaced according to an amount of operation of the operation member,
a second input member displaced according to the steering angle, and
a biasing component biasing the first input member to a neutral position at which an amount of displacement of the first input member matches an amount of displacement of the second input member,
the control valve controlling flow of fluid supplied to the hydraulic actuator according to a difference between the amount of displacement of the first input member and the amount of displacement of the second input member, and
the operation member being operated against biasing force produced by the biasing component.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/556,359Filed 26 Oct 2016

Priority

JP 2015-21386830 Oct 2015

Published

US 2018/0105202 A119 Apr 2018

Granted

18 Feb 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

B62D 5/065
Fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle: characterised by specially adapted means for…
B62D 5/006
Means for generating torque on steering wheel or input member, e.g. feedback: power actuated
B62D 5/04
Power-assisted or power-driven steering: electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
B62D 5/0409
Electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear: electric motor acting on the steering column

Work vehicle

Life of this patent

Work vehicle

Life of this patent

Abstract

Claims12