US 11,938,807 B2
Device for cooling and lubricating an electric power train of an electric or hybrid motor vehicle
Bassel Assaad, Saint Cyr l'École (FR); and Julien Borie, Guyancourt (FR)
Assigned to RENAULT s.a.s., Boulogne-Billancourt (FR); and NISSAN MOTOR CO., LTD., Yokohama (JP)
Appl. No. 17/602,573
Filed by RENAULT s.a.s., Boulogne-Billancourt (FR); and NISSAN MOTOR CO., LTD., Yokohama-Shi (JP)
PCT Filed Mar. 20, 2020, PCT No. PCT/EP2020/057861
§ 371(c)(1), (2) Date Oct. 8, 2021,
PCT Pub. No. WO2020/207770, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 19 03881 (FR), filed on Apr. 11, 2019.
Prior Publication US 2022/0126677 A1, Apr. 28, 2022
Int. Cl. B60K 11/02 (2006.01); B60K 1/00 (2006.01); H02K 9/19 (2006.01)
CPC B60K 11/02 (2013.01) [B60K 1/00 (2013.01); B60K 2001/006 (2013.01); B60Y 2200/91 (2013.01); B60Y 2306/05 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A device for cooling and lubricating an electric power train of an electric or hybrid motor vehicle, comprising an electric machine with a wound rotor and a speed reducer coupled to the machine, the device comprising:
a cooling circuit of the electric machine which is supplied with oil, comprising a heat exchanger which is connected to a pipe for removing cooling liquid coming from a cooling liquid circuit which connects members of the electric power train passing via a radiator of the vehicle and to a pipe for removing oil coming from an oil reservoir which is arranged in the lower portion of the electric machine and control means in order to supply at an output of the heat exchanger a flow of oil which is controlled in terms of temperature to an oil distribution circuit of the cooling circuit which is configured to project the oil which is controlled in terms of temperature and which is from the heat exchanger onto heating elements of the electric machine, whilst the oil projected in this manner is recovered in the oil reservoir;
a lubrication circuit of the speed reducer comprising a housing inside which the speed reducer is arranged, a base of the housing being shaped to constitute an oil store which enables the speed reducer to be lubricated by moving a volume of oil generated by the rotation of elements of the speed reducer in contact with the oil store; and
a diversion pipe at the output of the heat exchanger, the diversion pipe being configured to convey a portion of the oil which is controlled in terms of temperature and which is from the heat exchanger to an inlet of a network of heat exchange pipes which are arranged in contact with the base of the housing of the speed reducer in order to enable the oil of the oil store to be cooled, the output of the network of heat exchange pipes being connected to the oil reservoir.