Straddle Vehicle Wheel Speed Sensor Linkage Mechanism
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Solution Overview
Problem
Existing straddle-type vehicles face challenges in accurately detecting wheel speed due to the independent swinging of the front wheel supporting arm and brake bracket, which can lead to inaccuracies in wheel speed measurement.
Innovation Solution
A wheel speed sensor configuration where a rotary member is fixed on the axle and an axle rotation measuring unit is turnably supported opposite to the rotary member, with a link mechanism connecting the axle rotation measuring unit to the front fork, allowing it to turn in the opposite direction of the front wheel supporting arm, maintaining the relative position and ensuring accurate wheel speed detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the front wheel supporting arm swings independently to allow suspension movement, then the suspension function is improved, but the wheel speed measurement accuracy deteriorates due to relative motion between the sensor and rotary member
Solution Approach 1:
Instead of fixing the sensor on the supporting arm (which moves), the patent inverts the approach by mounting the sensor on the stationary front fork while using a link mechanism to compensate for the arm's movement. This inversion of the mounting location resolves the contradiction by decoupling the sensor's reference frame from the moving arm.
Solution Approach 2:
The patent introduces a link mechanism as an intermediary between the front wheel supporting arm and the axle rotation measuring unit. This link mechanism compensates for the arm's swinging motion, maintaining the relative position between the sensor and rotary member despite the arm's independent movement, thus preserving measurement accuracy while allowing suspension function.
2Ease of operation
If the brake bracket swings independently for brake operation, then the brake function is improved, but the wheel speed detection accuracy deteriorates due to changing relative positions
Solution Approach 1:
The link mechanism serves as an intermediary that compensates for both the supporting arm's suspension movement and the brake bracket's independent swinging. It maintains the relative position between the axle rotation measuring unit and the rotary member on the axle, ensuring accurate wheel speed detection while allowing both suspension and brake operations to function independently.
3Device complexity
If the axle rotation measuring unit is fixed on the front wheel supporting arm, then the structure is simplified, but measurement accuracy deteriorates during arm turning
Solution Approach 1:
Rather than directly fixing the sensor on the moving arm (simple but inaccurate), the patent uses a link mechanism as an intermediary that connects the arm to the sensor. This adds some structural complexity but ensures the sensor maintains a stable relative position to the rotary member, achieving accurate measurements.
Solution Approach 2:
The patent replaces a simple rigid mechanical mounting (sensor fixed directly on arm) with a more complex mechanical linkage system that actively compensates for motion. This substitution transforms the mounting from a static connection to a dynamic compensation system that maintains measurement accuracy despite arm movement.
Data Source
AI summary
An axle extends in an axial direction. A front wheel is rotatable around a wheel rotational axis. A front wheel supporting arm rotatably supports the axle. A front fork swingably supports the front wheel supporting arm such that the front wheel supporting arm is rotatable in a first direction about the wheel rotational axis. A rotary member is rotatable together with the axle around the wheel rotational axis. An axle rotation detector is supported on the axle opposite to the rotary member in the axial direction to be rotatable around the wheel rotational axis to detect a difference between rotational speeds of the axle rotation detector and the rotary member. A link mechanism is provided between the axle rotation detector and the front fork to turn the axle rotation detector in a second rotational direction opposite to the first rotational direction about the wheel rotational axis.