WE CLAIM
1. A disc wheel 200 with variable thickness for agricultural tractor and/ or off
road vehicle application comprising:
an axle mounting area 201 having a thickness T;
an axle mounting radius area 202 connecting to a wheel weight mounting
area 203;
a connection bracket mounting area 204 having a thickness T3 same as the
thickness T of the axle mounting area 201;
characterized in that,
wherein said thickness of the disc wheel includes maximum thickness T at
the axle mounting area 201 and T3 at the connection bracket mounting
area 204;
wherein said thickness T from the axle mounting area 201 gradually
decreases up to the end of the wheel weight mounting area 203 and
matches the thickness T3 at the connection bracket mounting area 204
using a flow form process 402; and
wherein the thickness T2 of the wheel weight mounting area 203 is less
than the thickness T1 of the axle mounting radius area 202 and the
thickness T1 of the axle mounting radius area 202 is less than the
thickness T of the axle mounting area 201.
2. The disc wheel 200 as claimed in claim 1, wherein said thickness T1 of the
axle mounting radius area 202 is in a range of 0.65T - 0.9T.
3. The disc wheel 200 as claimed in claim 1, wherein said thickness T2 of the
wheel weight mounting area 203 is in the range of 0.4T - 0.5T.
4. The disc wheel 200 as claimed in claim 1, wherein said disc wheel 200
with variable thickness prevents bolt hole failures by providing higher
strength at the axle mounting area 201.
5. The disc wheel 200 as claimed in claim 1, wherein tensile strength of the
axle mounting area 201 is 300 to 800MPa; wherein said tensile strength of
a region between the axle mounting radius area 202 and the wheel weight
mounting area 203 increase up to 50MPa to 400MPa.
6. The disc wheel 200 as claimed in claim 1, wherein said disc wheel is
formed by flow form process and thereby provides variable thickness
across disc profile without affecting the thickness T of the axle mounting
area 201 and T3 the connection bracket mounting area 204.
7. A method for forming a disc wheel 200 using a flow forming process 402
comprising the steps of, spinning a square blank with or without hole in a
circular mandrel 407; forming disc using flow forming process in the
square blank 408; reducing thickness of the disc gradually from the axle
mounting area 201 up to the end of the wheel weight mounting area 203
without affecting thickness of an axle mounting area and a connection
bracket mounting area 409; and piercing and clipping edge of the formed
disc 410.