Polyurethane gauge wheel tire
A disclosed example embodiment of a gauge wheel tire includes a first polyurethane sidewall portion, a second polyurethane sidewall portion, a polyurethane ground-engaging portion, and a polyurethane axial support portion. The first polyurethane sidewall portion is spaced apart from the second polyurethane sidewall portion, and the polyurethane ground-engaging portion extends from the first polyurethane sidewall portion to the second polyurethane sidewall portion and is adapted to contact a ground surface as the gauge wheel tire rotates about an axis of rotation. The polyurethane axial support portion extends from the first polyurethane sidewall portion to the second polyurethane sidewall portion, and is spaced apart from the polyurethane ground-engaging portion to form a gap that allows radial movement of the polyurethane ground-engaging portion relative to the polyurethane axial support portion.
1. A method for making a gauge wheel tire, comprising:
forming a first elastomer component comprising at least a ground-engaging portion of the gauge wheel tire, the ground-engaging portion being adapted to contact a ground surface as the gauge wheel tire rotates about an axis of rotation;
forming a second elastomer component comprising at least an axial support portion; and
moving the first elastomer component relative to the second elastomer component to generate friction that melts contacting portions of the first elastomer component and the second elastomer component so as to combine the first elastomer component and the second elastomer component into an assembly in which the axial support portion is spaced apart from the ground-engaging portion to form a gap that allows radial movement of the ground-engaging portion relative to the axial support portion.
2. The method of claim 1 , wherein:
forming the first elastomer component comprises curing a first quantity of polyurethane material in a shape of the first elastomer component.
3. The method of claim 2 , wherein:
forming the second elastomer component comprises curing a second quantity of polyurethane material in a shape of the second elastomer component.
4. The method of claim 1 , wherein the first elastomer component further comprises a first sidewall portion and a second sidewall portion spaced apart from the first sidewall portion.
5. The method of claim 4 , wherein the first elastomer component further comprises a protrusion extending axially from the first sidewall portion, the protrusion including a generally flat region adapted to contact and clean debris from a disc or knife of an agricultural planter.
6. The method of claim 1 , wherein a hardness of at least the first elastomer component is between 85 Shore A and 95 Shore A.
7. The method of claim 6 , wherein a hardness of the second elastomer component is between 85 Shore A and 95 Shore A.
8. The method of claim 1 , wherein:
the second elastomer component has a circular shape that matches a circular shape of an inner circumference of the first elastomer component; and
combining the first elastomer component and the second elastomer component into the assembly comprises forming an annular cavity between the first elastomer component and the second elastomer component.
9. A gauge wheel tire, comprising:
a first polyurethane sidewall portion;
a second polyurethane sidewall portion spaced apart from the first polyurethane sidewall portion;
a polyurethane ground-engaging portion extending from the first polyurethane sidewall portion to the second polyurethane sidewall portion and adapted to contact a ground surface as the gauge wheel tire rotates about an axis of rotation; and
a polyurethane axial support portion extending from the first polyurethane sidewall portion to the second polyurethane sidewall portion, wherein the polyurethane axial support portion is spaced apart from the polyurethane ground-engaging portion to form a gap that allows radial movement of the polyurethane ground-engaging portion relative to the polyurethane axial support portion, wherein the polyurethane axial support portion comprises at least one protrusion that extends radially upward into the gap to inhibit the polyurethane ground-engaging portion from moving radially inward beyond a height of the at least one protrusion;
wherein there is a first seam at a first location where the polyurethane axial support portion and the first polyurethane sidewall portion are welded or glued together, and there is a second seam at a second location where the polyurethane axial support portion and the second polyurethane sidewall portion are welded or glued together.
10. The gauge wheel tire of claim 9 , wherein the polyurethane axial support portion has a different elastic modulus than each of the first polyurethane sidewall portion and the second polyurethane sidewall portion.
11. The gauge wheel tire of claim 9 , wherein the polyurethane axial support portion has a different hardness than each of the first polyurethane sidewall portion and the second polyurethane sidewall portion.
12. The gauge wheel tire of claim 9 , wherein the first seam comprises a first thermal welding joint and the second seam comprises a second thermal welding joint.
13. The gauge wheel tire of claim 12 , wherein the polyurethane axial support portion extends about an inner circumference of the gauge wheel tire to form an annular cavity defined by the first polyurethane sidewall portion, the second polyurethane sidewall portion, the polyurethane ground-engaging portion, and the polyurethane axial support portion.
14. The gauge wheel tire of claim 9 , wherein the first seam and the second seam each comprises an adhesive material.
15. The gauge wheel tire of claim 14 , wherein the polyurethane axial support portion extends about an inner circumference of the gauge wheel tire to form an annular cavity defined by the first polyurethane sidewall portion, the second polyurethane sidewall portion, the polyurethane ground-engaging portion, and the polyurethane axial support portion.
16. The gauge wheel tire of claim 9 , wherein a hardness of at least the polyurethane ground-engaging portion is between 85 Shore A and 95 Shore A.
17. The gauge wheel tire of claim 16 , wherein a hardness of each of the first polyurethane sidewall portion, the second polyurethane sidewall portion, and the polyurethane axial support portion is between 85 Shore A and 95 Shore A.
18. The gauge wheel tire of claim 9 , wherein the polyurethane axial support portion includes at least one flange that defines an annular cavity adapted to receive a circular gauge wheel rim.
19. The gauge wheel tire of claim 9 , further comprising a polyurethane protrusion portion extending axially from the first polyurethane sidewall portion, the polyurethane protrusion portion including a generally flat region adapted to contact and clean debris from a disc or knife of an agricultural planter.
20. The gauge wheel tire of claim 9 , wherein a hardness of at least the polyurethane ground-engaging portion is between 70 Shore A and 65 Shore D.
21. The gauge wheel tire of claim 16 , wherein a hardness of each of the first polyurethane sidewall portion, the second polyurethane sidewall portion, and the polyurethane axial support portion is between 70 Shore A and 65 Shore D.
22. The method of claim 1 , wherein the axial support portion comprises at least one protrusion that extends radially upward into the gap to inhibit the ground-engaging portion from moving radially inward beyond a height of the at least one protrusion.