Pivot Joint Pin-and-Slit Structure for Backlash-Free Assembly
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Solution Overview
Problem
Conventional pivot joint structures using a clevis pin suffer from backlash, abnormal noise, reduced actuation efficiency, and difficult assembly due to clearance requirements and the need for additional components like anti-removal split pins.
Innovation Solution
A pivot joint structure with a pin having a protrusion part inserted into a slit and secured by a spring, featuring guide parts and curved sections to prevent backlash and facilitate easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clearance is provided at connection parts to ensure dimension tolerance and assembly operability, then assembly is easier, but backlash occurs causing abnormal noise and degraded actuation efficiency
Solution Approach 1:
A pin is introduced as an intermediary component between the pedal and clevis. The pin includes a pin body inserted through pin holes and a protrusion part that engages with a slit in the clevis, mediating the connection to eliminate backlash while maintaining assembly operability
Solution Approach 2:
The slit in the clevis is designed to be movable relative to the protrusion part during assembly. The slit has a first guide part that guides the protrusion part during insertion and a second guide part that positions it finally, allowing dynamic adjustment during the assembly process to ensure proper engagement without backlash
2Reliability
If an anti-removal split pin is inserted to prevent pin removal, then pin security is improved, but assembly complexity increases due to difficult both-hand work
Solution Approach 1:
The anti-removal function is merged into the clevis structure itself through the slit design. The protrusion part inserted into the slit provides both positioning and anti-removal functionality, eliminating the need for separate split pin components and simplifying assembly to a single-hand operation
Solution Approach 2:
The slit structure with its guide parts performs the anti-removal function automatically during the assembly process. The first guide part guides insertion and the second guide part secures the protrusion part in position, making the structure self-servicing without requiring additional components or complex assembly steps
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
The structure reduces backlash, improves assembly efficiency, enhances actuation efficiency, and ensures reliable operation with reduced noise and simplified assembly.
Implementation Method 1
a spring (40) that is urged by elastic force in a state of being deformed, toward one side in the axial direction of the pin body (31)
Data Source
AI summary
A pivot joint structure includes a first pin hole, a second pin hole, and a pin including a pin body inserted through the first pin hole and the second pin hole. The pin includes a protrusion part extending from an axis center of the pin body in a first direction, the fixation holder includes a planar part where the second pin hole is provided and a wall part rising from the planar part in the axial direction of the pin body, the wall part includes a first slit extending in a second direction and having an opening at one end, and the protrusion part is inserted into the first slit by being rotated toward the first slit about a rotation center at the axis center of the pin body.