Park-Position Mechanism Force Absorption Guide Rod
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Solution Overview
Problem
Conventional park-position mechanisms for all-terrain vehicles face issues with smooth switching to the PARK position due to accidental contact with the addendum top face of the park gear, leading to undesired strains and potential damage to the park arm.
Innovation Solution
A park-position mechanism featuring a cam, park gear, and park arm with a torsion spring and guide rod system that absorbs driving forces, allowing for smooth engagement and disengagement of the park gear, preventing damage and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cam directly drives the park arm to engage the park gear, then the switching action is direct and simple, but the park arm is subjected to excessive force and may be damaged
Solution Approach 1:
The guide rod acts as an intermediary component between the cam and the park arm. The cam drives the guide rod, which in turn drives the park arm to engage the park gear. This intermediary structure allows the driving force to be transmitted more smoothly and reduces the direct impact force on the park arm, thereby preventing damage while maintaining operational reliability.
2Speed
If the cam directly engages the park gear through the park arm, then the switching speed is fast, but operation smoothness is compromised due to accidental contact with the addendum top face
Solution Approach 1:
The guide rod serves as a mediator that translates the cam's rotational motion into smooth linear motion of the park arm. This intermediary mechanism ensures that the park arm engages the park gear smoothly without accidental contact with the addendum top face, while still maintaining fast switching speed.
Solution Approach 2:
The patent incorporates a resilient member (such as a spring) that provides beforehand cushioning to absorb shocks and reduce impact forces during the engagement process. This cushioning effect prevents operation trouble caused by accidental contact and ensures smooth switching.
3Device complexity
If the park arm is directly driven by the cam without force absorption, then the mechanism is simple, but excessive force damages the park arm
Solution Approach 1:
The guide rod acts as a force-absorbing intermediary between the cam and the park arm. It transmits the driving force from the cam while absorbing excessive force through its movable connection, thereby protecting the park arm from damage without significantly increasing mechanism complexity.
Solution Approach 2:
The resilient member provides beforehand cushioning by absorbing excess force before it can reach and damage the park arm. This cushioning mechanism is integrated into the guide rod assembly, maintaining relative simplicity while significantly improving the park arm's durability.
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 mechanism ensures smooth operation and protects the park arm from excessive forces, enhancing the durability and ease of assembly by absorbing driving forces and facilitating correct engagement with the park gear.
Implementation Method 1
a resilient member absorbs the driving force from the cam, preventing direct force application to the park arm
Implementation Method 2
A park arm (6) is arranged between the cam (522) and the park gear (531)... A torsion spring (64) is arranged between the park arm (6) and the crankshaft case (7)
Data Source
AI summary
A park-position mechanism includes a selector mechanism that includes a cam mounted on a selector hub shaft, a park gear mounted on a main shaft and corresponding in position to the cam, a park arm arranged between the cam and the park gear. The park arm has a holed base fit over a stud that rotates and supports the park arm in a crankshaft case. A torsion spring is arranged between the park arm and the crankshaft case with ends attached to the park arm and the crankshaft case respectively. The park arm has a driven section and an engaging section respectively extending from opposite sides of the holed base. The engaging section forms a projection. The driven section forms a hole in which a guide rod is received in an axially movable manner. The guide rod is engaged with the earn and is thus selectively driven by the cam to cause engagement of the projection of the engaging section with the park gear. A resilient member is arranged between the hole and the guide rod. The resilient member and the guide rod function to absorb a driving force induced by the earn to eliminate direct application of the force on the driven section thereby protecting the park arm from being damaged by excessive amount of force acting thereon and enhancing operation smooth of switching to the PARK position.