Torsion bar torque transducer is mainly composed of torsion bar tension spring, rotation-displacement converter, and potentiometer. The main function of the torsion bar tension spring is to detect the torque of the driver acting on the steering wheel and convert it into the corresponding corner value.
The angle-displacement converter is a pair of spiral mechanisms that convert the relative rotation angles of the two ends of the torsion bar tension spring into the axial displacement of the sliding sleeve, consisting of a rigid ball, a spiral groove and a slider. The slider can move in the spiral direction relative to the input shaft, and together the slider is mounted to the output shaft by a pin and can move vertically relative to the output shaft.
Therefore, when the input axis rolls relative to the output axis, the slider moves vertically according to the direction of rotation of the input axis and the amount of rotation relative to the output axis. When the steering wheel is rolled, the knob moment is transmitted to the torsion lever, and the input axis is incorrectly relative to the direction of the output axis.
The error is that the slider is moving, and the movement of these axes is converted into the lever rotation viewpoint of the potentiometer, and the movement of the sliding contact on the resistance line changes the resistance value of the potentiometer, and the change in resistance is converted into voltage by the potentiometer. In this way, the torque signal is converted into a voltage signal.
Planning of torsion bar torque transducers:
The torsion bar is an important part of the entire torsion bar torque sensor, so the key to the planning of the torsion bar torque sensor is the planning of the torsion bar. The torsion bar is connected to the steering wheel shaft by means of a fine-toothed involute spline, and the other end is connected to the steering output shaft by a radial pin (diameter D).
Outer diameter of the end structure of the torsion bar fine-toothed involute spline:
d0=(1.15-1.25)d, length L=(0.5-0.7)d, in order to avoid excessive stress concentration, when excessive fillet, the radius R=(3-5)d, the useful length of the torsion bar is l, and d is the diameter of the useful length of the torsion bar.
The changing stiffness k of the torsion bar is an important physical quantity of the torsion bar, which can be calculated with reference to the following formula.
When it is subjected to torque T, the shear stress τ and deformation angle φ are changed, respectively:
The varying stiffness is:
where d-torsion bar diameter, useful length, Ip moment of inertia, Zi torsional cross-section coefficient
Torsion bar torque sensors are used more in EPS in the early stage, but because they are contact, the conflicts generated during operation make them easy to wear and tear, affecting their accuracy, and will be gradually screened.
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