HYDRAULIC CONTROL DEVICE

摘要

A hydraulic control device (1) is equipped with: a mechanical pump (31) that supplies oil to a power transmission device (5) via a hydraulic passage (36) by means of the driving of an engine (3); an electric pump (33) that supplies oil to the power transmission device (5) via the hydraulic passage (36) by means of the driving of a motor (32) when the engine (3) stops and the mechanical pump (31) has stopped; and an accumulator (44) which is connected to the hydraulic passage (36) and accumulates oil from the hydraulic passage (36) by means of the opening/closing of an accumulation control valve (45) during normal driving of a vehicle (2), and which supplies accumulated oil to a belt-type continuously variable transmission mechanism (11) of the power transmission device (5) when a disturbance is input from the drive wheel (4) side during driving while an idling stop function, which stops the engine (3) when the vehicle is operating, is being executed. By means of this configuration the accumulator (44) is used to ensure the belt-clamping force of the continuously variable transmission mechanism (11), and the pressure level of the oil which can be supplied by the electric pump (33) can be reduced, so an increase in the size of the electric pump (33) can be prevented.