Tire pressure sensors and tire valves

A tire valve, comprising a tire pressure sensor, wherein, the tire pressure sensor comprises a sensor assembly obtained through an injection molding process, and the sensor assembly comprises a printed circuit board, a battery and a helical antenna assembly;

• wherein battery pins of the battery are connected to corresponding power supply pins of the printed circuit board respectively;
• the helical antenna assembly comprises an antenna support and a helical antenna on an outer sidewall of the antenna support, the antenna support is internally hollow, a helical groove is provided on the outer sidewall of the antenna support, the helical antenna is wound into the helical groove, and a plurality of fasteners for fixing the printed circuit board are at a bottom of the antenna support;
• wherein a pressure sensing component and an antenna matching circuit are printed on the printed circuit board, and the antenna matching circuit is configured to transmit to an input end of the helical antenna a radio frequency signal which is output by the pressure sensing component and obtained by the pressure sensing component modulating a sensed tire pressure signal;
• and
• wherein there is a wedge-shaped groove adapted to the helical antenna on an upper end of the antenna support, and a line distance of the helical groove is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.