US 12,472,661 B2
Mixer drum drive with additional pump
Bryan Datema, Rochester, MN (US); David Ilgert, Oshkosh, WI (US); Robert Varao, Oshkosh, WI (US); and Yanming Hou, Oshkosh, WI (US)
Assigned to Oshkosh Corporation, Oshkosh, WI (US)
Filed by Oshkosh Corporation, Oshkosh, WI (US)
Filed on Jan. 26, 2021, as Appl. No. 17/158,662.
Claims priority of provisional application 62/968,581, filed on Jan. 31, 2020.
Prior Publication US 2021/0237312 A1, Aug. 5, 2021
Int. Cl. B28C 5/42 (2006.01); B60L 1/00 (2006.01); B60L 53/50 (2019.01); B60P 3/16 (2006.01)
CPC B28C 5/4272 (2013.01) [B28C 5/4213 (2013.01); B28C 5/422 (2013.01); B28C 5/4268 (2013.01); B60L 1/003 (2013.01); B60L 53/50 (2019.02); B60P 3/16 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A vehicle, comprising:
an engine;
an electric energy system;
a drum configured to mix drum contents received therein;
a drum drive system coupled to the drum and the engine, the drum drive system including:
a primary pump mechanically coupled to the engine;
an electric motor powered by the electric energy system;
an auxiliary pump fluidly coupled to the primary pump and powered by the electric motor, the auxiliary pump being a variable displacement pump, the electric motor and the auxiliary pump forming part of an accessory power unit that is removably coupled to the vehicle, the accessory power unit further comprising a housing that is configured to enclose the electric motor and the auxiliary pump; and
a drum motor fluidly coupled to the primary pump and the auxiliary pump and positioned to drive the drum to agitate the drum contents; and
a control system communicably coupled to the drum drive system, the control system configured to:
activate the electric motor based on an operating status of the vehicle; and
control a displacement of the auxiliary pump to satisfy a target rotational speed of the drum without increasing an operating speed of the electric motor.