Tire pressure sensor and automobile tire

A tire pressure sensor, comprising:

• a housing, a fixed base being provided in the house, the fixed base being provided with an accommodation recess having an upward opening, and a vent hole penetrated to the exterior of the housing being provided on the bottom wall of the accommodation recess;
• a circuit board being fixed in the housing, the circuit board being provided with a tire pressure detection chip, and the tire pressure detection chip being located in the accommodation recess, and being provided with a detection hole at a position corresponding to the vent hole;
• an elastic sealing member located between the bottom wall of the accommodation recess and the tire pressure detection chip, and being used for sealing a gap between the bottom wall of the accommodation recess and the tire pressure detection chip, and the elastic sealing member being provided with a communication hole communicated with the detection hole and the vent hole;
• and a flexible sealant filled between the inner peripheral wall of the accommodation recess and the outer peripheral wall of the tire pressure detection chip, and between the inner peripheral wall of the accommodation recess and the outer periphery of the elastic sealing member;
• wherein a limiting groove is further provided at the middle of the bottom wall of the accommodation recess, the accommodation recess, the limiting groove and the vent hole are successively arranged in communication from top to bottom on the fixed base, and in an axial direction of the vent hole, the cross-sectional area of the limiting groove is greater than that of the vent hole and less than that of the accommodation recess;
• the elastic sealing member is adapted to the limiting groove, and part of the elastic sealing member is located in the limiting groove, and the other part is located in the accommodation recess and is in extrusion contact with the tire pressure detection chip;
• wherein an area of the face of the elastic sealing member facing the tire pressure detection chip is greater than an area of the face of the tire pressure sensor chip facing the elastic sealing member.