US 11,802,031 B2Granted

Electric boom

AssigneeOshkosh Corporation

InventorsPrabhu Shankar, Louis Bafile, Jihong Hao, Eko Prasetiawan, Scott Riley, David Lombardo

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Abstract

A fully electric lift device includes a base assembly, a lift assembly, a platform assembly, tractive elements, an energy storage device, and a control system. The lift assembly is coupled with the base assembly and is driven by an electric linear actuator for a lifting function. The platform assembly is positioned at a top of the lift assembly and can be raised or lowered as the lift assembly performs the lifting function. The tractive elements are rotatably coupled with the base assembly and can be driven by an electric wheel motor to perform a driving function. The control system includes a controller that operates the electric wheel motor and the electric linear actuator to perform the driving function and the lifting function using power drawn from the energy storage device. The lift assembly and the tractive elements use only electrical energy to perform the lifting and driving functions.

Claims20

Dependent claims

A lift device, comprising:

a chassis;
a battery coupled to the chassis;
a lift assembly coupled to the chassis and configured to selectively raise and lower a load relative to the chassis;
a front axle assembly pivotally coupled to the lift assembly and configured to rotate about a longitudinal axis relative to the chassis and a rear axle assembly pivotally coupled to the lift assembly and configured to rotate about the longitudinal axis relative to the chassis;
a plurality of tractive elements coupled to the front axle assembly and the rear axle assembly and configured to support the lift device;
a front electric linear actuator coupled to at least one of the chassis and the front axle assembly and configured to consume electrical energy supplied by the battery to extend and retract and a rear electric linear actuator coupled to at least one of the chassis and the rear axle assembly and configured to consume electrical energy supplied by the battery to extend and retract;
and
a controller configured to control operation of the front electric linear actuator and the rear electric linear actuator;
wherein in a first mode of operation, the controller is configured to control the front electric linear actuator and the rear electric linear actuator to permit rotation of the front axle assembly and the rear axle assembly through a first range of motion, and wherein in a second mode of operation, the controller is configured to control the front electric linear actuator and the rear electric linear actuator to limit rotation of the front axle assembly and the rear axle assembly to a second range of motion smaller than the first range of motion.

6 more elements

A method of controlling oscillation of a front axle assembly and a rear axle assembly of a lift device, the lift device including a pair of tractive elements coupled to the front axle assembly and the rear axle assembly, a chassis pivotally coupled to the front axle assembly and the rear axle assembly such that the front axle assembly and the rear axle assembly rotate relative to the chassis about a longitudinal axis, a front electric linear actuator coupled to at least one of the front axle assembly and the chassis, and a rear electric linear actuator coupled to at least one of the rear axle assembly and the chassis, the method comprising:

during a first mode of operation, controlling the front electric linear actuator and the rear electric linear actuator such that both the front axle assembly and the rear axle assembly are permitted to rotate through a first range of motion;
and
during a second mode of operation, controlling the front electric linear actuator and the rear electric linear actuator to limit rotation of both the front axle assembly and the rear axle assembly to a second range of motion smaller than the first range of motion.

A leveling system for a lift device, the leveling system comprising:

a battery;
a plurality of electric linear actuators comprising at least a front electric linear actuator coupled with at least one of a chassis of the lift device and a front axle assembly of the lift device, and a rear electric linear actuator coupled with at least one of the chassis of the lift device and a rear axle assembly of the lift device, the front axle assembly and the rear axle assembly pivotally coupled with a lift assembly and configured to rotate about a longitudinal axis relative to the chassis, wherein the plurality of electric linear actuators are configured to consume electrical energy supplied by the battery to extend and retract;
and
a controller configured to control operation of the plurality of electric linear actuators;
wherein in a first mode of operation, the controller is configured to control the front electric linear actuator to permit rotation of the front axle assembly through a first range of motion, and control the rear electric linear actuator to permit rotation of the rear axle assembly through the first range of motion, and wherein in a second mode of operation, the controller is configured to control the front electric linear actuator to limit rotation of the front axle assembly to a second range of motion smaller than the first range of motion, and control the rear electric linear actuator to limit rotation of the rear axle assembly to the second range of motion smaller than the first range of motion.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/881,322Filed 4 Aug 2022 · continuation
Priority: 5 Apr 2019
Published: US 2022/0371864 A124 Nov 2022
Granted: 31 Oct 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B66F 3/44
Devices, e.g. jacks, adapted for uninterrupted lifting of loads: with self-contained electric driving motors
B66F 11/044
For movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required…
B66F 11/048
For movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required…
B60S 9/21
Power driven manoeuvring fittings, e.g. reciprocably driven steppers or rotatably driven cams: comprising a rotatably driven auxiliary wheel or…

Family

Application62/829,972Us provisional application · filed 5 Apr 2019
Application62/829,919Us provisional application · filed 5 Apr 2019
Application62/829,960Us provisional application · filed 5 Apr 2019
Application62/830,128Us provisional application · filed 5 Apr 2019
Application62/829,976Us provisional application · filed 5 Apr 2019
Application16/811,180Parent of this continuation · filed 6 Mar 2020
US 2022/0371864 A1Pre-grant publication · published 24 Nov 2022
US 11,492,239 B2Parent of this continuation
US 2020/0317480 A1Published application
US 11,802,031 B2This patent

From the US filing history. Foreign family members aren’t listed.