Oil pressure sensor attachment structure

An oil pressure sensor attachment structure for attaching an oil pressure sensor to an upper surface of an oil passage body having therein an oil passage in which oil flows, the oil pressure sensor measuring a pressure of oil that flows in the oil passage,

• wherein the oil passage body has an oil passage opening, which is connected to the oil passage, in the upper surface of the oil passage body,
• wherein the oil pressure sensor includes a sensor body and a sensor case that covers the sensor body,
• wherein the sensor case includes a detection port in a lower surface thereof, the detection port being connected to the oil passage opening in a state in which the oil pressure sensor is attached to the upper surface of the oil passage body,
• the oil pressure sensor attachment structure comprising:
• a guide projection disposed on the upper surface of the oil passage body;
• and
• the sensor case,
• wherein the guide projection includes
• a pair of first walls that protrude upward from the upper surface of the oil passage body and that face each other in a first direction with the oil passage opening therebetween, the first direction being a horizontal direction, and
• a pair of first protrusions each of which protrudes from a corresponding one of the first walls toward the other first wall and that face each other in the first direction with a gap therebetween,
• wherein a receiving portion is provided between the first walls,
• wherein the receiving portion includes a first receiving opening that is open toward one side in a second direction that is a horizontal direction perpendicular to the first direction, and the receiving portion is capable of receiving the sensor case from the first receiving opening in the second direction,
• wherein the guide projection includes a second wall that protrudes upward from the upper surface of the oil passage body,
• wherein the second wall faces the first receiving opening in the second direction with a gap therebetween and is disposed in such a way that the oil passage opening is located between the second wall and the first receiving opening,
• wherein the sensor case includes
• a columnar portion that extends in an up-down direction and that is inserted into the gap between the first protrusions,
• a flange that protrudes from the columnar portion outward in a radial direction of the columnar portion, at least a part of the flange being disposed in the receiving portion between the upper surface of the oil passage body and the first protrusions, and
• a facing portion that is connected to the flange and protrudes to a position above the flange,
• wherein each of the first protrusions has a first surface that faces toward the other side in the second direction, and
• wherein the facing portion is disposed on the other side of the first surface in the second direction and faces the first surface.