Double mold shot pull to seat universal TPMS sensor
View Patent ↗A tire pressure sensor assembly is provided for use with a wheel rim including a valve hole. The sensor assembly including a metal valve stem element having a stem base, a stem body, a stem cap end, and an inner stem chamber. A lower sensor housing is rigidly over-molded onto the stem base and forms a sensor storage chamber. A tire pressure sensor element is mounted therein. An outer rubber seal is over-molded onto the stem body and includes an inner retention portion, an outer retention portion, and a retention groove configured to allow the metal valve stem element to be press-fit and retained into the valve hole. A plurality of vent holes are formed spaced around an outer perimeter of the stem base to allow universal orientation within the valve hole.
1. A tire pressure sensor assembly for use with a wheel rim including a valve hole, the tire pressure sensor assembly comprising:
a metal valve stem element comprising a stem base, a stem body, a stem cap end, and an inner stem chamber;
a lower sensor housing over-molded onto said stem base, said lower sensor housing forming a sensor storage chamber;
a tire pressure sensor element mounted within said sensor storage chamber;
an outer rubber seal over-molded onto said stem body, said outer rubber seal including an inner retention portion, an outer retention portion, and a retention groove, said outer retention portion configured to allow said metal valve stem element to be press-fit into the valve hole and retained by said retention groove;
a plurality of vent holes in communication with said inner valve chamber, said plurality of vent holes configured to allow universal orientation of said metal valve stem element within the valve hole.
2. A tire pressure sensor assembly as described in claim 1 , wherein said plurality of vent holes are formed into said metal valve stem.
3. A tire pressure sensor assembly as described in claim 1 , wherein said plurality of vent holes are formed spaced around an outer perimeter of said stem base to facilitate universal orientation.
4. A tire pressure sensor assembly as described in claim 1 , wherein said lower sensor housing is perpendicular to a stem axis such that said tire pressure sensor element is horizontally mounted.
5. A tire pressure sensor assembly as described in claim 1 , wherein said lower sensor housing is symmetrically mounted relative to a stem axis.
6. A tire pressure sensor assembly as described in claim 1 , wherein said retention groove is positioned along said stem body such that said stem body protrudes past the valve hole after installation to increase mounting rigidity.
7. A tire pressure sensor assembly as described in claim 1 , further comprising:
a sensor housing cover covering said sensor storage chamber.
8. A tire pressure sensor assembly as described in claim 7 , further comprising:
a pressure inlet formed in said sensor housing cover.
9. A tire pressure sensor assembly as described in claim 1 , further comprising:
a plurality of over-mold housing vents axially coincident with said plurality of vent holes.
10. A tire pressure sensor assembly for use with a wheel rim including a valve hole, the tire pressure sensor assembly comprising:
a metal valve stem element comprising a stem base, a stem body, a stem cap end, and an inner stem chamber;
a lower sensor housing rigidly over-molded onto said stem base, said lower sensor housing forming a sensor storage chamber;
a tire pressure sensor element mounted within said sensor storage chamber;
an outer rubber seal over-molded onto said stem body, said outer rubber seal including an inner retention portion, an outer retention portion, and a retention groove, said outer retention portion configured to allow said metal valve stem element to be press-fit into the valve hole and retained by said retention groove;
a plurality of vent holes in communication with said inner valve chamber, said plurality of vent holes formed spaced around an outer perimeter of said stem base to allow universal orientation of said metal valve stem elements within the valve hole.
11. A tire pressures sensor assembly as described in claim 10 , wherein said lower sensor housing is perpendicular to a stem axis such that said tire pressure element is horizontally mounted.
12. A tire pressure sensor assembly as described in claim 10 , wherein said lower sensor housing is symmetrically orientated relative to a stem axis.
13. A tire pressure sensor assembly as described in claim 10 , wherein said retention groove is positioned along said stem body such that said stem body protrudes past the valve hole after installation to increase mounting rigidity.
14. A tire pressure sensor assembly as described in claim 10 , further comprising:
a sensor housing cover covering said sensor storage chamber; and
a pressure inlet formed in said sensor housing cover.
15. A method of manufacturing a tire pressure sensor assembly for installation in a wheel rim including a valve hole, the method comprising:
forming a metal valve stem element comprising a stem base, a stem body, a stem cap, and an inner stem chamber, said metal valve stem element including a plurality of vent holes formed spaced around an outer perimeter of said stem base to allow universal orientation of said metal valve stem element within the valve hole after installation;
overmolding a lower sensor housing onto said metal valve stem element, said lower sensor housing forming a sensor storage chamber;
overmolding an outer rubber seal onto said stem body, said outer rubber seal including an inner retention portion, an outer retention portion, and a retention groove, said outer retention portion configured to allow said metal valve stem element to be press-fit into the valve hole and retained by said retention groove;
mounting a tire pressure sensor element within said sensor storage chamber.
16. A method as described in claim 15 , further comprising:
positioning said retention groove along said stem body such that said stem body protrudes past the valve hole after installation to increase mounting rigidity.
17. A method as described in claim 15 , wherein said lower sensor housing is perpendicular to a stem axis such that said tire pressure sensor element is horizontally mounted.
18. A method as described in claim 15 , further comprising:
overmolding a lower sensor housing such that a plurality of over-mold housing vents are formed axially coincident with said plurality of vent holes.
19. A method as described in claim 15 , wherein said lower sensor housing is orientated symmetrically around a stem axis.
20. A method as described in claim 15 , further comprising:
sealing said sensor storage chamber by way of mounting a sensor housing cover over said sensor storage chamber, said sensor housing cover including a pressure inlet formed therein.