Front Loader Boom Angle Sensing That Tolerates Backlash
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Solution Overview
Problem
Existing front loader systems face challenges in accurately detecting the relative rotation angle between members due to backlash and tolerance, which can cause the distance between the detection unit and the portion to be detected to exceed an appropriate operation distance.
Innovation Solution
A front loader system with a configuration that includes a fixing member, a rotating member, a detection unit, and an engagement member, where the engagement member is engaged with the rotating member to allow movement in the axial direction of the rotating shaft, and an engagement groove is formed in the radial direction to accommodate backlash, ensuring the detection unit and portion to be detected maintain a consistent distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an angle sensor is provided between two relatively rotating members (boom), then the rotation angle can be detected, but the distance between the portion to be detected and the detection unit may exceed the appropriate operation distance due to backlash and tolerance
Solution Approach 1:
The detection system is divided into separate components: a detection rod (engagement member) that rotates with the boom and a sensor body (detection unit) that remains stationary relative to the rotating shaft. This segmentation allows the detection rod to accommodate axial movement due to backlash while the sensor body maintains a stable detection position, ensuring both measurement precision and reliability
Solution Approach 2:
The detection rod acts as an intermediary between the rotating boom and the stationary sensor body. It transmits rotational information to the sensor while accommodating axial backlash through its ability to move along the radial engagement groove, thereby maintaining reliable detection despite the backlash and tolerance between rotating members
2Measurement precision
If the distance between the portion to be detected and the detection unit is kept at an appropriate operation distance, then accurate detection is possible, but additional components and complex installation are required
Solution Approach 1:
The detection rod serves multiple functions: it acts as an engagement member connecting to the boom, provides the portion to be detected by the sensor, and simultaneously accommodates axial backlash through movement along the engagement groove. This multi-functionality eliminates the need for separate components to handle backlash, reducing device complexity while maintaining detection accuracy
Solution Approach 2:
The engagement groove is designed to dynamically accommodate the detection rod's axial movement due to backlash. This dynamic design allows the system to adapt to varying backlash conditions without requiring precise pre-adjustment or additional rigid components, simplifying installation while maintaining accurate detection
Data Source
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AI summary
Included are: a fixing member (boom rotating shaft) fixed to the first member (side frame); a rotating member (sensor stay) relatively rotatable with respect to the fixing member, a portion to be detected (magnet) fixed to one (boom rotating shaft) of the fixing member and the rotating member, a detection unit (sensor body) fixed to the other (sensor stay) of the fixing member and the rotating member and configured to detect a relative rotation angle of the portion to be detected, and an engagement member (detection rod) fixed to the second member (boom) and engaged with the rotating member in a state of allowing movement of the rotating member in an axial direction of a rotating shaft.