Lever Switch Remote Shaft Alignment for Accuracy
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Solution Overview
Problem
Existing lever switch devices for vehicles suffer from reduced switching accuracy and limited operation angles due to the movement of remote shaft tip portions during rotational operations, affecting the reliability of switches corresponding to operating knobs.
Innovation Solution
A lever switch device with a bracket rotatably supported about a center axis, a lever main body rotating about a different axis, and remote shafts with operation portions aligned on the center axis, allowing for improved switching accuracy and reliability by maintaining constant positional relations between operation portions and their corresponding fittings during rotational operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two remote shafts are rotatably incorporated in the lever with operating knobs at tip portions, then the structure is simplified and the lever size is reduced, but the switching accuracy deteriorates and the operation angle is limited due to tip portion movement during rotation
Solution Approach 1:
The patent transitions from a conventional design where remote shafts rotate about their own axes to a design where remote shafts translate along the rotation center axis of the lever. This dimensional change in the motion pattern eliminates the tip portion movement that causes switching accuracy deterioration while preserving the compact structure.
Solution Approach 2:
The patent introduces operation portions as intermediary elements between the remote shafts and the switches. These operation portions are positioned at the rotation center axis and transmit rotational motion to the switches without suffering from the tip portion movement problem, thereby maintaining switching accuracy while enabling compact lever design.
2Device complexity
If two remote shafts are rotatably incorporated in the lever with operating knobs at tip portions, then the structure is simplified and the lever size is reduced, but the operation angle is limited due to tip portion movement during rotation
Solution Approach 1:
By changing the motion pattern of remote shafts from rotational movement about their own axes to translational movement along the lever's rotation center axis, the patent eliminates the geometric constraints that limit operation angle, thereby expanding the lever's rotational range while maintaining structural simplicity.
Solution Approach 2:
The operation portions serve as mediators that decouple the lever's rotation from the switches' actuation mechanism. This allows the lever to rotate through larger angles without the tip portions moving in a way that would constrain the operation, thereby increasing adaptability while keeping the structure simple.
3Volume of moving object
If the tip portion position moves during lever rotation, then the lever can be compact, but the reliability of switches is reduced
Solution Approach 1:
The operation portions positioned at the rotation center axis act as intermediaries between the remote shafts and the switches. They transmit motion reliably without the positional instability caused by tip portion movement, ensuring consistent switch actuation and high reliability while allowing compact lever dimensions.
Solution Approach 2:
By positioning operation portions at the rotation center axis rather than at the tip portions of remote shafts, the patent eliminates the dimensional instability that occurs during rotation. This ensures reliable switch actuation while maintaining compact lever size.
Data Source
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AI summary
The invention provides for a lever switch device, includes a lever main body (101) rotatably supported by a body (1) around a predetermined rotation centre axis (C), a first remote shaft (111) rotatably incorporated in the lever main body (101), and comprising a first operating knob (110) at one end and a first operation portion (112) at another end for operating an operational object by a rotational operation of the first operating knob (110), a second remote shaft (121) rotatably arranged in the lever main body (101) with a coaxial structure with the first remote shaft (111), and includes a second operating knob (120) at one end and a second operation portion (122) at another end for operating an operational object by a rotational operation of the second operating knob, (120) and wherein centres of rotation of the first and second operation portions )112, 122) are provided on the said rotation centre axis of the lever main body (101).