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Improved Wheel Pilot Bore Diameter Gauge Disclosure Number: IPCOM000251107D
Publication Date: 2017-Oct-12
Document File: 1 page(s) / 316K

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The Prior Art Database

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Improved Wheel Pilot Bore Diameter Gauge

Wheel pilot bores in the automotive industry require tight tolerances for diameter. If the pilot

bore is too small the wheel will not fit over the hub; if it is too large the vehicle will experience

excess vibration from the wheel being misaligned with the axle. Most wheel suppliers use a

go/no-go gauge consisting of 2 cylinders, one with the maximum specified bore diameter and

one with the minimum, to determine if their wheels are built to spec. If the smaller cylinder fits

within the pilot bore and the larger one does not the wheel is considered within spec.

These types of gauges are flawed however, and can mark an out of specification bore as

being within specification. If the bore has an oval shape with the narrow part of the oval smaller

than the maximum diameter and the wide part of the oval larger than the maximum diameter the

gauge will still measure the bore as within specification. See figure 1. A pilot bore with these

attributes could still create significant vibration in a vehicle.

Figure 1 Figure 2

The suggested solution is a new gauge. The minimum diameter cylinder will be the same;

if the minimum end of the gauge fits in the pilot bore is large enough. The other end of the gauge

will consist of a bar however, instead of a cylinder. See figure 2. The bar will be as long as the

maximum specified pilot bore diameter. It can be rotated around the circumference of the pilot

bore and if it fits into the pilot bore at any angl...