Engine mount system

An engine mount system comprising:

• multiple vacuum-driven switchable liquid-filled engine mounts that are switchable to provide different mount characteristics by selectively introducing negative pressure or atmospheric pressure;
• pipelines connected to respective ones of the engine mounts for introducing the negative pressure or the atmospheric pressure into the engine mounts;
• and
• a check valve and an orifice portion for restricting a flow rate of a fluid flowing therethrough, the check valve and the orifice portion being provided in parallel on one of the pipelines connected to a first engine mount of said engine mounts;
• a switching valve for switching the pressure to be introduced in the engine mounts between the negative pressure and the atmospheric pressure in accordance with a vehicular running state, wherein the pipelines are joined together at a junction, the switching valve is provided between the junction and a side from which the negative or atmospheric pressure is introduced into the switching valve, and the check valve and the orifice portion being provided on the one of the pipelines at a location between the junction and the first engine mount;
• wherein, due to the check valve and the orifice portion being arranged in parallel on said one of the pipelines, the system is operable such that when the switching valve changes the pressure in said pipelines from atmospheric pressure to negative pressure, the pressure in all of said engine mounts changes at a substantially similar rate due to fluid flow through both the check valve and the orifice portion, and when the switching valve changes the pressure in said pipelines from negative pressure to atmospheric pressure, the pressure in said first engine mount changes at a different rate than the pressure in another of said engine mounts, due to fluid flow to the first engine mount exclusively through said orifice portion.