Vacuum pump and system of a vacuum pump and an engine

A system, comprising:

• an engine;
• and
• a vacuum pump including:
• a casing;
• a cavity in the casing, the cavity having an inlet and an outlet;
• a vane configured to be rotated inside the cavity so as to draw fluid into the cavity through the inlet and to expel fluid out of the cavity through the outlet thereby causing a reduction in pressure at the inlet;
• a drive shaft configured to rotationally drive the vane;
• an oil supply conduit extending through the drive shaft and configured to supply oil from a reservoir to the cavity;
• and
• a check valve arranged in the oil supply conduit between the reservoir and the cavity, the check valve having a check valve body,
• wherein the check valve is configured to meter a flow of the oil from the reservoir to the cavity, and
• wherein the check valve body is configured to be located, when a pressure in the oil supply conduit on a reservoir side of the check valve exceeds, by at least a first threshold, a pressure in the oil supply conduit on a cavity side of the check valve, in a closed position thereby preventing the flow of oil from the reservoir to the cavity, and
• wherein the vacuum pump is mounted to the engine.

A vacuum pump suitable for mounting to an engine, comprising:

• a casing;
• a cavity in the casing, the cavity having an inlet and an outlet;
• a vane configured to be rotated inside the cavity so as to draw fluid into the cavity through the inlet and to expel fluid out of the cavity through the outlet thereby causing a reduction in pressure at the inlet;
• an oil supply conduit configured to supply oil from a reservoir to the cavity;
• a check valve arranged in the oil supply conduit between the reservoir and the cavity, the check valve having a check valve body;
• and
• valve seat against which the check valve body is biased so as to prevent the flow of oil from the reservoir to the cavity when a pressure in the oil supply conduit on a reservoir side of the check valve exceeds, by at least a first threshold, a pressure in the oil supply conduit on a cavity side of the check valve.