Vehicular brake hydraulic control device

1. A vehicular brake hydraulic pressure control device comprising:

first and second brake operation elements;

a first brake system comprising:

a first control valve unit that actuates a first wheel brake; and

an interlocking control valve unit that actuates a second wheel brake;

wherein the first control valve unit and the interlocking control valve unit are operated in response to operation of the first operation element;

a second brake system comprising a second control valve unit that actuates a second wheel brake in response to an operation of the second operation element; and

a switching unit;

wherein the first brake system comprises:

a first master cylinder that is connected to the first operation element and generates hydraulic brake pressure in a first hydraulic pressure output channel communicating with the first control valve unit and the interlocking control valve unit;

one or more accumulators that stores brake fluid, which is supplied to the first hydraulic pressure output channel, at atmosphere;

a cut valve that is disposed between the first hydraulic pressure output channel, and a first wheel hydraulic pressure channel connected to the first wheel brake and an interlocking wheel hydraulic pressure channel connected to the second wheel brake, and switches between allow-state and block-state, in which brake fluid is allowed to flow or is blocked, respectively, from the first hydraulic pressure output channel to the first wheel hydraulic pressure channel and the interlocking wheel hydraulic pressure channel; and

a pump that is disposed between a hydraulic pressure intake channel connected to the first hydraulic pressure output channel and a hydraulic pressure discharge channel connected to the first wheel hydraulic pressure channel and the interlocking wheel hydraulic pressure channel, and

the second brake system comprises:

a second master cylinder that is connected to the second operation element and generates hydraulic brake pressure in a second hydraulic pressure output channel connected to the second control valve unit,

a plurality of brake cylinders that is provided in the second wheel brake, and comprising:

a first port into which brake fluid flows from the interlocking control valve unit of the first brake system, and

second ports into which brake fluid flowed from the second control valve unit enter thereto through other corresponding channels than the interlocking control valve unit, and

wherein the plurality of brake cylinders are actuated independently by corresponding brake fluid flowed from the interlocking control valve unit and the second control valve unit, and

wherein the switching unit changes a channel through which the brake fluid flows into the first hydraulic pressure output channel, from the first master cylinder to the one or more accumulators, when the pump is in operation.

2. The device according to claim 1 , further comprising:

a detecting unit that detects the operational amount of the first operation element;

a stroke simulator that is connected to the first hydraulic pressure output channel, and applies reacting force to the first operation element in accordance with the detected operational amount by the detecting unit when the pump is in operation; and

wherein the first control valve unit and the interlocking control valve unit are controlled on the basis of detected operational amount by the detecting unit.

3. The device according to claim 1 ,

wherein the switching unit is a cutoff valve that opens and closes the first hydraulic pressure output channel and

the one or more accumulators is connected to the first hydraulic pressure output channel such that brake fluid flows into or out the one or more accumulators.

4. The device according to claim 1 ,

wherein the brake fluid returned to the first hydraulic pressure output channel through the hydraulic pressure intake channel flows into the one or more accumulators.

5. The device according to claim 1 ,

wherein the first brake system is a rear wheel brake system, and

the second brake system is a front wheel brake system.

6. The device according to claim 1 ,

wherein the first brake system is a front wheel brake system, and

the second brake system is a rear wheel brake system.