Tire valve and method for producing tire valve
A tire valve includes a grommet fitted on an outside of a valve stem on a proximal end side, the tire valve being inserted into a valve attachment hole from a distal end side, the grommet having a proximal end portion engaging with the valve attachment hole, a stem step portion provided on an outer surface of the valve stem and increasing in diameter at the proximal end side and facing toward the distal end side, a ring provided on the grommet in a portion on the distal end side of the stem step portion and restricting axial movements of the ring relative to the grommet, and a pressed portion provided on the grommet between the stem step portion and the ring to be pressed between the stem step portion and the ring wherein the grommet receives a load applied toward the proximal end side of the valve stem.
1. A tire valve including a grommet fitted on an outside of a valve stem on a proximal end side, which is one end side of the valve stem, the tire valve being inserted into a valve attachment hole of a tire wheel from a distal end side, which is an other end side of the valve stem, the grommet having a proximal end portion engaging with the valve attachment hole, the tire valve comprising:
a stem step portion provided on an outer surface of the valve stem in a portion where the grommet is fitted, the stem step portion increasing in diameter at the proximal end side, and facing toward the distal end side,
a ring provided on the grommet in a portion on the distal end side of the stem step portion of the valve stem, and restricting axial movements of the ring relative to the grommet, and
a pressed portion provided on the grommet between the stem step portion and the ring, to be pressed between the stem step portion and the ring wherein the grommet receives a load applied toward the proximal end side of the valve stem,
wherein the ring is arranged radially outside the grommet, and
wherein the grommet is provided with a grommet step portion on an outer surface thereof so as to face the ring from the distal end side.
2. The tire valve according to claim 1 wherein the ring has an inside diameter substantially equal to a diameter of an outer periphery of the stem step portion.
3. The tire valve according to claim 1 , wherein the grommet is formed with a ring accommodating groove on the outer surface thereof, the groove accommodating the ring and including the grommet step portion in a distal end portion thereof.
4. The tire valve according to claim 2 , wherein the grommet is formed with a ring accommodating groove on the outer surface thereof, the groove accommodating the ring and including the grommet step portion in a distal end portion thereof.
5. The tire valve according to claim 1 , wherein the stem step portion has a tapered surface that comes closer to a center axis of the valve stem toward the distal end side.
6. The tire valve according to claim 1 , wherein the ring has a tapered surface in a proximal end portion where an inner surface is tapered outward toward the proximal end side.
7. The tire valve according to claim 1 , wherein the grommet includes, on the outer surface thereof, an engaging groove that engages with an opening edge of the valve attachment hole, and a tapered portion extending from the engaging groove and decreasing in diameter toward the distal end side,
the valve stem includes a large-diameter part extending from an outer edge of the stem step portion toward the proximal end side,
the large-diameter part being positioned on a radially inner side of the engaging groove or the tapered portion of the grommet.
8. The tire valve according to claim 1 , wherein the pressed portion is located in a middle portion in the axial direction of the grommet, and
a gap is formed between the one end side of the stem step portion of the valve stem and the grommet.
9. A method for producing the tire valve according to claim 1 , wherein
the grommet is fitted over the valve stem from the distal end side after the ring has been fixed to or engaged with the grommet.