Motorcycle Throttle Grip Apparatus with Directional Biasing
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Solution Overview
Problem
The existing throttle grip apparatuses for motorcycles suffer from unstable rotation and reduced operability due to the need for a single, high-biasing-force spring and limited layout flexibility, which increases the size of the apparatus when trying to detect the rotation angle of the throttle grip.
Innovation Solution
A throttle grip apparatus with multiple engaging parts on the throttle grip and interlocking member, a biasing-force applying unit that selectively applies the biasing force of the second biasing unit based on the rotation direction, and a transmission unit with a gear to accommodate the second biasing unit within the interlocking member, stabilizing the rotation and reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one second biasing unit is installed inside the interlocking member, then the structure is simple, but a spring with relatively large biasing force is required and rotation becomes unstable
Solution Approach 1:
The patent divides the single second biasing unit into multiple second biasing units (at least two) distributed around the interlocking member. This segmentation allows the total biasing force to be distributed across multiple smaller forces, providing stable rotational return without requiring a single large-biasing-force spring, thereby resolving the contradiction between structural simplicity and rotation stability.
2Difficulty of detecting and measuring
If the magnet and second biasing unit are installed inside the interlocking member, then the rotation detection is achieved, but the size of the interlocking member increases and installation position of the magnetic sensor is limited
Solution Approach 1:
The patent extracts the magnet from the interlocking member and relocates it to the rotary member. This extraction reduces the size and complexity of the interlocking member while maintaining the rotation detection function, as the magnetic sensor can now detect the rotation of the rotary member which carries the magnet, thereby resolving the contradiction between detection capability and component size.
Solution Approach 2:
The rotary member is given multiple functions: it transmits rotation from the throttle grip to the interlocking member and also carries the magnet for rotation angle detection. This multi-functionality eliminates the need for separate components and reduces overall system complexity and size.
3Adaptability or versatility
If a rotary member and transmission unit are added to transmit rotation, then the magnet can be installed outside the interlocking member, but the size of the whole apparatus increases due to separate spaces required
Solution Approach 1:
The patent merges the transmission function and detection function into a single rotary member. The rotary member both transmits rotation from the throttle grip to the interlocking member and carries the magnet for detection. This merging eliminates the need for separate transmission units and magnet mounting structures, reducing the overall apparatus size while maintaining layout flexibility.
Solution Approach 2:
The magnet is nested on the rotary member which itself is nested within the interlocking member structure. This nesting arrangement allows compact integration of multiple functions without requiring separate spaces, thereby reducing the overall apparatus size while maintaining adaptability.
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 design improves the operability and stability of the throttle grip by selectively applying biasing forces based on rotation direction, while maintaining a compact size and flexible layout, enhancing the control of engine operations.
Implementation Method 1
a first biasing unit configured to bias the interlocking member toward its initial position
Implementation Method 2
a second biasing unit configured to bias the sliding member toward its initial position
Implementation Method 3
a rotation angle detecting unit having a magnet installed inside the interlocking member and a magnetic sensor configured to detect a change in the magnetic force from the magnet
Data Source
AI summary
A throttle grip apparatus includes a throttle grip, an interlocking member which includes engaged parts to be engaged with engaging parts formed on the throttle grip and is rotatable in conjunction with rotation of the throttle grip, a first biasing unit which biases the interlocking member when the throttle grip rotates in a normal direction, a second biasing unit which biases the interlocking member when the throttle grip rotates in a reverse direction. The engaging parts and the engaged parts are formed respectively on the throttle grip and the interlocking member at regular intervals along a rotation direction of the throttle grip, and the second biasing unit is installed at each of positions between the engaged pans of the interlocking member.