Shift Knob Assembly Locking Mechanism for Secure Rod Connection
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Solution Overview
Problem
The assembly process of shift knobs for vehicles is complex and time-consuming, and existing designs often result in the shift knob being forcibly inserted, making precise alignment difficult and increasing the risk of separation when turned strongly.
Innovation Solution
A shift knob assembly featuring a connection pin, a locking part with elastic return, and a guide part that simplifies the assembly process by allowing the shift rod to be easily locked into place, preventing rotation by external forces through a combination of guide protrusions, a damper part, and an elastic spring mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift knob is assembled by screwing it onto threads on the rod, then the connection is secure, but the assembly process becomes difficult and time-consuming
Solution Approach 1:
The invention divides the connection mechanism into separate functional elements: a connection pin on the rod, a through hole in the coupling part, and a locking part with locking protrusions. This segmentation allows for a simpler insertion process while maintaining secure connection through the locking mechanism.
Solution Approach 2:
The locking part acts as an intermediary element between the connection pin and the knob body. It receives the connection pin through the through hole and secures it using locking protrusions that engage with the pin, providing both ease of assembly and secure connection.
2Productivity
If the shift knob is forcibly inserted into the rod, then assembly is completed, but precise alignment becomes difficult and the risk of separation increases
Solution Approach 1:
The locking part serves as a mediator that guides the connection pin into proper alignment through the through hole before securing it. This intermediary structure ensures precise alignment without requiring forceful insertion, eliminating the associated risks.
Solution Approach 2:
The locking part automatically performs the alignment function as the connection pin is inserted through the through hole. The geometry of the through hole and locking part working together enable self-alignment, eliminating the need for external alignment tools or techniques.
3Ease of operation
If the shift knob is turned strongly by the driver, then gear shifting is achieved, but the shift knob may be forcibly turned relative to the rod and separated
Solution Approach 1:
The locking protrusions are pre-configured on the locking part to engage with the connection pin before any operational forces are applied. This preliminary locking action prevents the shift knob from being forcibly turned or separated during strong driver input.
Solution Approach 2:
The locking mechanism provides dynamic resistance to separation forces while allowing the intended rotational motion for gear shifting. The locking protrusions engage with the connection pin to prevent separation, yet the overall structure permits the necessary movement for operation.
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 simplifies the assembly and disassembly of shift knobs, enhances durability, and prevents unwanted rotation, making the process more efficient and reliable.
Implementation Method 1
an elastic part connected to the locking part for allowing the locking part that is rotated by the connection pin to go back to an original position by elastic force
Data Source
AI summary
A shift knob assembly includes a shift rod provided with a connection pin; a knob body provided with a mounting space therein, a coupling part into which the shift rod is inserted from a lower portion of the coupling part, and a through hole formed at the lower portion of the coupling part for allowing the connection pin to pass therethrough; a locking part being mounted in the mounting space of the knob body; and an elastic part connected to the locking part for allowing the locking part that is rotated by the connection pin to go back to an original position by elastic force. The shift knob assembly can simplify an assembly process of the knob body for a vehicle, provide efficient assembling/disassembling of the shift knob, and prevent the shift knob from being rotated by external force.