| 摘要 |
A design assisting apparatus of a steering device arranges a coordinate of a handle position reference point, a coordinate of a first universal joint reference point, a coordinate of a second universal joint reference point, and a coordinate of a steering gear reference point in a three-dimensional space, calculates a reference axis passing through the second universal joint reference point from the first universal joint reference point, calculates a phase angle which is an angle between a straight line from the handle position reference point to the first joint reference point when viewed along the reference axis and a straight line from the second joint reference point to the steering gear reference point when viewed along the reference axis, and determines success or failure of a condition in which the allowable range of the phase angle allowable error is included in the allowable range of the allowable torque variation rate. |
| 主权项 |
1. A design assisting apparatus of a steering device including a steering mechanism with a column yoke, a slide tube yoke, a slide shaft yoke, and a pinion-side yoke,
the design assisting apparatus comprising:
a storage unit that stores a coordinate of a handle position reference point of a handle, a coordinate of a first universal joint reference point connecting the column yoke and the slide tube yoke, a coordinate of a second universal joint reference point connecting the slide shaft yoke and the pinion-side yoke, a coordinate of a steering gear reference point, an allowable torque variation rate, and a phase angle allowable error which is a range of a phase angle deviation caused by a manufacturing error;an input unit that accepts a change of the allowable torque variation rate or the phase angle allowable error;a reference point arrangement unit that arranges the coordinate of the handle position reference point, the coordinate of the first universal joint reference point, the coordinate of the second universal joint reference point, and the coordinate of the steering gear reference point, in a three-dimensional space in which the longitudinal, vertical, and lateral directions of a vehicle are determined;a reference axis calculation unit that calculates a reference axis passing through the second universal joint reference point from the first universal joint reference point;a phase angle calculation unit that calculates a phase angle which is an angle between a first projection line which is a straight line from the handle position reference point to the first universal joint reference point projected onto a projection plane perpendicular to the reference axis and a second projection line which is a straight line from the second universal joint reference point to the steering gear reference point projected onto the projection plane;a control device that calculates a torque variation rate-phase angle curve as a function of a torque variation rate and the phase angle, wherein the torque variation rate is a ratio between an input torque and an output torque, the input torque is a torque on one axis connecting between the handle position reference point and the first universal joint reference point and the output torque is a torque on another axis connecting between the steering gear reference point and the second universal joint reference point;an allowable range determination unit that determines success or failure of a condition in which an allowable range of the phase angle allowable error is included in an allowable range corresponding to the allowable torque variation rate based on the torque variation rate-phase angle curve; anda display unit that displays the allowable range corresponding to the allowable torque variation rate and the allowable range of the phase angle allowable error. |
