Tire pressure monitoring sensor and mounting method

1. A tire pressure monitoring assembly mountable to a wheel rim comprising:

a rubber housing defining a bore;

a valve body disposed at least partially within the bore; and

a spring member disposed within the bore of the rubber housing and biased against a surface of the wheel rim for securing the tire pressure monitoring assembly, wherein the spring member includes a shape that biases a portion of the rubber housing radially outward.

2. The assembly as recited in claim 1 , wherein the spring member compresses radially responsive to the assembly being pulled through an opening in the wheel rim.

3. The assembly as recited in claim 1 , wherein the spring member comprise a strip of material that deforms from a first shape that biases a portion of the rubber housing radially outward to a second shape that retracts the portion of the rubber housing for insertion through the opening an opening in the wheel rim.

4. The assembly as recited in claim 1 , wherein the spring member includes a portion for securing a sensor housing within the wheel rim.

5. The assembly as recited in claim 3 , wherein the spring member comprises a coil spring including a first diameter and a second diameter, wherein the second diameter is larger than the first diameter.

6. The assembly as recited in claim 1 , wherein the spring member includes a cam surface engageable for biasing the spring member radially outward.

7. The assembly as recited in claim 6 , including a mandrel received within the bore for engaging the cam surface and biasing the spring member radially outward.

8. The assembly as recited in claim 7 , wherein the mandrel comprises a portion of the valve body that engages the spring member.

9. The assembly as recited in claim 7 , wherein the mandrel includes a detent for locking the spring member in a radially outward position.

10. A method of securing a valve stem and tire pressure monitoring assembly to a wheel rim comprising the steps of:

a) inserting a rubber housing through an opening in a wheel rim; and

b) expanding a biasing member supported by the rubber housing radially outward to engage a surface of the wheel rim radially outboard of the opening.

11. The method as recited in claim 10 , wherein the biasing member comprises a spring clip supported on a valve stem extending from the rubber housing.

12. The method as recited in claim 10 , including the step of disposing the biasing member within the rubber housing and compressing the biasing member to a size capable of being received through the opening in the wheel rim.

13. The method as recited in claim 10 , wherein the step of compressing the biasing member comprises pulling the rubber housing axially to elongate a portion of the biasing member and concurrently reduce a size of the biasing member.

14. The method as recited in claim 10 , including the step of disposing a biasing member within a bore of the rubber housing and deforming the biasing member radially outward with a fixed part of the tire pressure monitoring assembly received within the bore.

15. The method as recited in claim 14 , including the step of locking the biasing member in the deformed radially outward position with a detent on the fixed part.