| 摘要 |
PURPOSE:To enable the air pressure within a tire to be detected on the car side in a simple manner by forming a passage communicating the inside of the tire with the outside thereof in an axle, and providing thereby a connecting device equipped with the sealing function by magnetic fluid for the bearing section of the axle through which the passage is communicated outside. CONSTITUTION:An axle D is provided with a communicating pipe 9 to the axial direction wherein the aforesaid pipe is communicate with the inside of a tire through a pipe 11. Furthermore, the axle 1 is provided to the radial direction with another communicating pipe 13 the center section of which is communicated with a connecting pipe 9. And one end section thereof is hermetically communicated with a pipe 15 through a connecting device 16. And the connecting device 16 is constituted in such a way that a plurality of circularly projected sections 20a is provided on the inner circumference of the outer wheel 20 of a bearing 3 for forming a space 21, and that a permanent magnet 23 and magnetic fluid 24 allowing magnetic flux thereof to be energized in maintaining the space 21 at a hermetic condition are provided in the space 21. Owing to this constitution, the air pressure within a tire is led to a pipe 15 from the pipe 11 through the connecting device 16, thereby detecting thereof by a specified detecting means for controlling loads. |
