Hydraulic unit of electronic control brake system

1. A hydraulic unit of an electronic control brake system, which includes a modulator block having a plurality of accommodating bores in which a plurality of valves and pressure sensors coupled to a master cylinder to control braking hydraulic pressure supplied towards vehicle wheels are installed,

wherein passages connecting between the accommodating bores are formed in the modulator block, and the passages are formed to be divided into two layers,

wherein the accommodating bores in which an inflow valve, an outflow valve, a shut-off valve, a simulation valve, a pressure sensor and a switching valve are installed are formed on one surface of the modulator block, and the accommodating bore in which a check valve is installed are formed on the other surface of the modulator block facing the one surface of the modulator block, and

wherein the plurality of accommodating bores, formed on one surface of the modulator block, have the inflow valve, the outflow valve, the shut-off valve, the simulation valve, the pressure sensors, and the switching valve positioned in order.

2. The hydraulic unit according to claim 1 , wherein the modulator block is formed to have two hydraulic circuits, and the plurality of accommodating bores and the passages forming the two hydraulic circuits are formed laterally symmetric with respect to the center of the modulator block.

3. The hydraulic unit according to claim 1 , wherein the accommodating bore in which the check valve is accommodated is formed to be positioned between the shut-off valve and the switching valve.

4. The hydraulic unit according to claim 2 , wherein the modulator block has a master cylinder connecting unit, a reservoir connecting unit, a pedal simulator connecting unit, and a pressure supplying device connecting unit further formed on the other surface of the modulator block.

5. The hydraulic unit according to claim 4 , wherein the reservoir connecting unit, the pedal simulator connecting unit, and the pressure supplying device connecting unit are positioned on a central line of the modulator block separating the two hydraulic circuits, and

wherein the reservoir connecting unit and the pressure supplying device connecting unit are connected to the two hydraulic circuits through the passages.

6. The hydraulic unit according to claim 1 , wherein a wheel cylinder connecting unit is formed in a side surface between one surface and the other surface of the modulator block.