US 11,987,113 B2
Oil supply device and control method for electric vehicle powertrain
Jin Young Hwang, Suwon-Si (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed on Jul. 11, 2022, as Appl. No. 17/861,595.
Claims priority of application No. 10-2021-0108311 (KR), filed on Aug. 17, 2021.
Prior Publication US 2023/0053739 A1, Feb. 23, 2023
Int. Cl. B60K 11/02 (2006.01); F16H 57/04 (2010.01); H02P 29/60 (2016.01)
CPC B60K 11/02 (2013.01) [F16H 57/0435 (2013.01); F16H 57/0436 (2013.01); H02P 29/60 (2016.02); F16H 57/0476 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An oil supply apparatus for an electric vehicle powertrain apparatus, the oil supply apparatus comprising:
an electric oil pump;
a motor lubrication flow path connected to the electric oil pump and provided to supply oil from the electric oil pump to a bearing of a motor;
a motor cooling flow path branched from the motor lubrication flow path to supply oil for cooling the motor from the electric oil pump; and
a cooling control valve apparatus provided in the motor cooling flow path to control oil supplied to the motor through the motor cooling flow path according to an operating state of the electric oil pump,
wherein the cooling control valve apparatus is configured to be elastically supported to open when a pressure of oil supplied from the electric oil pump reaches a predetermined opening pressure, and
wherein when the pressure of the oil reaches the predetermined opening pressure and the cooling control valve apparatus opens, the cooling control valve apparatus is self-locked by the pressure of the oil so that the cooling control valve apparatus does not close until the pressure of the oil reaches a predetermined closing pressure lower than the predetermined opening pressure.