Patent ID: 7614708

Claim:
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.