Load Detection Device Point Contact Transmission Member
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Solution Overview
Problem
The load detection device disclosed in Japanese Unexamined Patent Application Publication No. 2017-49134 suffers from accuracy deterioration over time due to repeated sliding between the curved surface of the load detection part and the resin part of the application member, leading to deformation and reduced detection accuracy.
Innovation Solution
A load detection device configuration featuring a load detection part with a curved surface, an application member with a flat surface, and a transmission member that allows for point contact between the curved surface and the transmission member, and surface contact between the flat surface and the transmission member, enabling increased sliding of the application member relative to the transmission member when a shearing force is applied, thus preventing deformation and maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the curved surface of the load detection part and the resin part of the application member are in point contact to absorb relative inclination, then assembly tolerance is accommodated, but the resin part deforms due to repeated sliding and detection accuracy deteriorates over time
Solution Approach 1:
A flat surface part is introduced as an intermediary component between the curved surface of the load detection part and the resin part of the application member. This flat surface part receives the shearing force through sliding and prevents direct transmission of deformation to the resin part, thereby maintaining load detection accuracy while still accommodating assembly tolerances through the curved surface contact
Solution Approach 2:
The contact interface is segmented into two distinct contact regions: a curved surface contact between the load detection part and flat surface part for absorbing relative inclination, and a flat surface contact between the flat surface part and resin part for shearing force absorption. This segmentation separates the functions of tolerance accommodation and force transmission, preventing resin part deformation
2Reliability
If the flat surface of the application member and the transmission member are in surface contact, then the shearing force is absorbed through sliding, but the device complexity increases
Solution Approach 1:
The flat surface part serves multiple functions simultaneously: it acts as a contact surface for the curved surface to absorb relative inclination, provides a sliding interface with the resin part for shearing force absorption, and prevents deformation of the application member. This multi-functionality reduces the need for additional components despite the increased contact interface
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively absorbs shearing forces and prevents deformation of the application member, thereby maintaining the accuracy of load detection over time by allowing the application member and transmission member to slide in the shear direction, reducing positional deviations and preventing foreign matter entry.
Implementation Method 1
an amount of sliding of the application member with respect to the transmission member is larger than that of the load detection part with respect to the transmission member when a shearing force is applied to the load detection device
Data Source
AI summary
A load detection device capable of preventing deterioration of the accuracy of a load detection with the lapse of time is provided. A first exemplary aspect is a load detection device, including: a load detection part including a curved surface; an application member comprising a flat surface; and a transmission member located between the load detection part and the application member. The curved surface of the load detection part and a first surface of the transmission member come into point contact with each other, and the flat surface of the application member and a second surface opposite to the first surface of the transmission member come into surface contact with each other.