Holding structure for tire air pressure detecting device
A holding structure of a tire air pressure detecting device includes a tire air pressure detecting device ( 23 ) which is held by a screw shaft ( 43 ) of a tire valve ( 30 ), a fixing nut ( 44 ) which is screwed to the screw shaft ( 43 ) and configured to fix the tire valve ( 40 ) to a wheel rim ( 30 ), a holding sleeve ( 50 ) which is screwed to the screw shaft ( 43 ) and configured to hold the tire air pressure detecting device ( 23 ) on the screw shaft ( 43 ), an elastic member ( 45 ) which is sandwiched between the tire air pressure detecting device ( 23 ) and a device supporting portion ( 60 ) including at least one of the fixing nut ( 44 ), the holding sleeve ( 50 ) and the wheel rim ( 30 ) in an axial direction of the screw shaft ( 43 ), and a rotation restricting portion ( 48 ) which is configured to restrict rotation of the tire air pressure detecting device ( 23 ) around the screw shaft ( 43 ) between the elastic member ( 45 ) and the tire air pressure detecting device ( 23 ).
1. A holding structure of a tire air pressure detecting device, comprising:
a wheel in which a tire is mounted on a wheel rim;
a tire valve which is fixed to the wheel rim;
a tire air pressure detecting device which is held by a screw shaft protruding on an inner side of the tire in the tire valve;
a fixing nut which is screwed to the screw shaft and configured to fix the tire valve to the wheel rim;
a holding sleeve which is screwed to the screw shaft and configured to hold the tire air pressure detecting device on the screw shaft; and
an elastic member which is sandwiched between the tire air pressure detecting device and a device supporting portion including at least one of the fixing nut, the holding sleeve and the wheel rim in an axial direction of the screw shaft, wherein:
the tire air pressure detecting device is in a floating support state capable of being elastically displaced toward the fixing nut side in the axial direction of the screw shaft,
the tire air pressure detecting device comprises a case side rotation restricting portion which engages with the elastic member in a case which accommodates equipment, and
the elastic member comprises a rotation restricting portion which is configured to restrict rotation of the tire air pressure detecting device around the screw shaft by engaging with the case side rotation restricting portion.
2. The holding structure of a tire air pressure detecting device according to claim 1 , wherein one of the rotation restricting portion and the case side rotation restricting portion comprises a plurality of concave or convex first fitting portions arranged in a rotating direction around the screw shaft, and
the other one of the elastic member and the tire air pressure detecting device comprises a convex or concave second fitting portion capable of being fitted to any one of the plurality of first fitting portions.
3. The holding structure of a tire air pressure detecting device according to claim 1 , wherein the elastic member is integrally mounted on the fixing nut.
4. The holding structure of a tire air pressure detecting device according to claim 1 , wherein the elastic member is provided to be spaced apart from the wheel rim.
5. The holding structure of a tire air pressure detecting device according to claim 1 , wherein the elastic member comprises a sandwiched portion which is sandwiched between the tire air pressure detecting device and the device supporting portion in the axial direction of the screw shaft, and a fitting portion which engages with the device supporting portion not to allow relative rotation around the screw shaft, and
the fitting portion comprises the rotation restricting portion on an end surface spaced apart from the tire air pressure detecting device in the axial direction.
6. The holding structure of a tire air pressure detecting device according to claim 1 , wherein: each of the case and the elastic member is a resin molded product,
the rotation restricting portion is formed on the elastic member, and
a case side rotation restricting portion which engages with the rotation restricting portion is formed on the case.