US 9,750,191 B2Granted

Electro-hydraulic drive system

AssigneeParker-Hannifin Corporation

InventorsJason Scot Richardson, Ryan Schroeder, Victor Connor, Kenneth Jackson

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Abstract

Provided is an electro-hydraulic drive system including first and second electro-hydraulic transmissions for driving respective wheels, the transmissions each including an electric motor, a hydraulic pump driven by the electric motor, and a hydraulic motor drive by the hydraulic pump. When used in a turf vehicle, such as a zero-turn-radius mower, the electro-hydraulic drive system operates the wheels independently from an engine of the mower, thereby allowing the mower to be moved without having to start the engine. In this way, power consumption is lowered and total efficiency of the mower is increased.

Claims18

Dependent claims

A mower comprising:

an engine;
an electro-hydraulic drive system including:
a first electro-hydraulic transmission for driving a first wheel, the first electro-hydraulic transmission including a first electric motor, a first hydraulic pump coupled to and driven by the first electric motor, and a first hydraulic motor coupled to and driven by the first hydraulic pump, the hydraulic motor including an output shaft for driving the wheel;
and
a second electro-hydraulic transmission for driving a second wheel, the second electro-hydraulic transmission including a second electric motor, a second hydraulic pump coupled to and driven by the second electric motor, and a second hydraulic motor coupled to and driven by the second hydraulic pump, the hydraulic motor including an output shaft for driving the wheel,
wherein the electro-hydraulic drive system is operable during a normal operating state of the engine and wherein the electro-hydraulic drive system is operable when the engine is in a non-operating state.

3 more elements

A mower including:

a frame;
a mower deck supported by the frame;
an engine mounted to the frame and configured to power the mower deck;
an electro-hydraulic drive system including:
a first electro-hydraulic transmission for driving a first wheel, the first electro-hydraulic transmission including a first electric motor, a first hydraulic pump coupled to and driven by the first electric motor, and a first hydraulic motor coupled to and driven by the first hydraulic pump, the hydraulic motor including an output shaft for driving the wheel, wherein each of the first hydraulic pump, the first electric motor, and the first hydraulic motor are mounted relative to a first common housing;
and
a second electro-hydraulic transmission for driving a second wheel, the second electro-hydraulic transmission including a second electric motor, a second hydraulic pump coupled to and driven by the second electric motor, and a second hydraulic motor coupled to and driven by the second hydraulic pump, the hydraulic motor including an output shaft for driving the wheel, wherein each of the second hydraulic pump, the second electric motor, and the second hydraulic motor are mounted relative to a second common housing;
and
a controller coupled to the first and second electric motors for controlling the first and second motors,
wherein the electro-hydraulic drive system is operable during a normal operating state of the engine and wherein the electro-hydraulic drive system is operable when the engine is in a non-operating state.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/254,674Filed 1 Sep 2016 · continuation
Priority: 10 May 2012
Published: US 2016/0366824 A122 Dec 2016
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

A01D 69/025
Electric: electric hybrid systems
A01D 69/03
Driving mechanisms or parts thereof for harvesters or mowers: fluid
B60K 17/105
Of fluid gearing: units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles
F01C 1/103
Of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member: the two members rotating…

Family

Application61/645,111Us provisional application · filed 10 May 2012
Application13/891,777Parent of this continuation · filed 10 May 2013
US 2016/0366824 A1Pre-grant publication · published 22 Dec 2016
US 9,435,324 B2Parent of this continuation
US 2013/0302188 A1Published application
US 9,750,191 B2This patent

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

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