Introduction to the Concept and Structure of Spoke and Wheel Sensors

In order to meet the needs of different scales, manufacturers have designed multiple types of sensors, including spoke type sensors. In addition, there are S-type sensors, single point sensors, cantilever beam sensors, box sensors, corrugated pipe sensors, column sensors, bridge sensors, micro sensors, and so on. Today, we will mainly introduce themSpoke sensor。
　

The elastic element of the spoke type sensor is an elastic element with a hole structure, which looks like a wheel and forms multiple symmetrically distributed spokes between the wheel hub and tire. External load is applied to the upper end face of the wheel hub. The wheel hub, spoke, and tire together form multiple shear beams with fixed supports on both sides. The elastic components of the spoke sensor are as follows:

The shear force elastic element of the hole structure has a low profile and good stability. It is not very sensitive to bending moments, but has good linearity. Large lateral stiffness, strong resistance to lateral and eccentric loads. The overall structure is symmetrical, and the thermal expansion in different directions is consistent with each other, with a small temperature coefficient.

The hole shaped elastic element adopts a simple drilling process to ensure that the cross-sectional shear beam has greater stiffness and smaller stress concentration at the root, and the strain area is in a pure shear stress state. This can make the sticking position of the resistance strain gauge more reasonable. If there are many holes formed by shear strain beams, it is easier to obtain an ideal stress area suitable for sticking resistance strain gauges.

The advantages brought by the structure of spoke type sensors include strong impact resistance and anti bias load capacity, not affected by loading points and supporting edges, good linearity, fixed installation, convenient installation, and good interchangeability; The disadvantages of the spoke type sensor structure include complex mechanical processing, high manufacturing costs, and difficulty in controlling large lag.