Receptacle for a fluid, in particular engine oil pan or transmission oil pan for a motor vehicle

An oil pan for a motor vehicle, comprising:

• a drain opening located in a lower portion of the oil pan when the oil pan is in an installed position;
• a drain plug that is configured to be inserted in the drain opening and moveable from an open to a closed position and vice versa, the drain plug comprising a body comprising a circumferential groove extending around a vertical axis extending through the body;
• and
• an O-ring seal within the circumferential groove;
• wherein:
• the drain plug and drain opening are complementary in shape, such that in the closed position the drain plug and the drain opening form a bayonet closure, such that said O-ring seal centers the drain plug in the drain opening and engages at least an inward facing surface of the drain opening and an outward facing surface of the body to form a radial seal;
• the drain opening has a periphery including at least a retaining face, a guide ramp, and an oblique guide, the retaining face extending only over a portion of an angular extent of the drain opening at the periphery of the drain opening;
• the drain plug comprises a locking element that is configured such that, when viewed from outside the oil pan, a first rotatory movement of the drain plug causes at least a portion of the locking element to abut the guide ramp and the retaining face, so as to guide the drain plug axially to the closed position;
• the locking element comprises at least a first side that is oriented towards an interior of the oil pan, the first side comprising at least one oblique slide face that is configured to abut a facing surface of the oblique guide of the periphery of the drain opening such that a second rotatory movement of the drain plug causes the at least one oblique slide face of the locking element to abut the facing surface of the oblique guide of the periphery of the drain opening, so as to guide the drain plug axially to the open position;
• and
• the oblique guide of the drain opening has a stagger that is configured such that axial movement of the drain plug along the oblique guide from the closed to the open position is greater than a strand thickness of the O-ring seal and disengages the O-ring seal from the inward facing surface of the drain opening.