Mounting structure for power control unit

摘要

A PCU (20) comprises an anchoring pedestal (22) that is attached to the opening of a transaxle and that has been molded from resin so as to be formed integrally with a terminal block (21); a cooler (27) that is disposed on top of the anchoring pedestal (22) and that has a power module; a heat-conductive board stay (14) connected to the top of the cooler (27); and a control board (29) connected to the top of the board stay (14). This mounting structure is configured such that by disposing the board stay (14) near a cooling tube (17a) for introducing coolant cooled by a radiator and by attaching the stay to the cooler (27) via a heat-dissipating sheet (61a) for actively conducting heat from the control board, the control board (29) is cooled by the coolant before the coolant has absorbed heat. Thus, the pressure elevation converter and inverter that form the power control unit and the motor are housed as a single component inside one case and the coolability of the control board disposed at the top of the power control unit can be ensured.

主权项

1. A power control unit mounting structure, employed to mount, on a motor case in which a rotary electric machine that drives a vehicle is housed, a power control unit that controls the rotary electric machine,
wherein the power control unit includes
an anchoring pedestal, molded by employing a resin, that is attached to an opening of the motor case,a cooler that is disposed on the anchoring pedestal, and that has a power module,a heat-conductive board mounting base connected to a top of the cooler,a control board connected to a top of the board mounting base,a cover that is made of a thin metal plate and covers the entire power control unit,a first heat insulating chamber provided between the anchoring pedestal and the cooler, anda second heat insulating chamber provided between the cooler and the cover,wherein a transfer of heat from the motor case to the power control unit is restricted by the anchoring pedestal, the first and second heat insulating chambers, and the cover to prevent increase of a temperature for the control board.