Parking Gear Sprag Stopper Structure to Prevent Rod Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing parking apparatus for vehicles experiences damage to the parking rod part due to racheting between the sprag and parking gear when the parking gear is released on a gradient road, leading to loss of parking function.
Innovation Solution
The parking apparatus includes a detent lever part, a parking rod part with a cam structure that reduces direct contact between the sprag and parking rod body, and a sprag stopper part that makes a line contact with the parking rod cam part, preventing damage and maintaining the parking function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sprag part directly contacts the parking rod body part, then the structure is simple, but damage to the parking rod part occurs due to racheting between the sprag and parking gear
Solution Approach 1:
The patent introduces a sprag stopper part as an intermediary component between the sprag part and the parking rod cam part. This mediator prevents direct contact between the sprag and the parking rod body, thereby eliminating the source of damage while maintaining the overall simplicity of the structure.
Solution Approach 2:
The parking rod cam part is segmented into distinct functional zones: a cam tilting part with a specific tilt angle and a cam contact part. This segmentation allows the sprag stopper to interact with one portion while the sprag interacts with another, preventing damage transmission to the parking rod body.
2Speed
If the parking gear is disposed in one axis for faster rotation, then the parking gear release speed increases, but strong rotatory power causes the sprag to attempt to go between the teeth, causing racheting
Solution Approach 1:
The sprag stopper part is positioned to preemptively prevent the sprag from engaging with the parking rod cam part during the gear release process. By establishing this protective constraint before racheting can occur, the design counteracts the harmful effects of the strong rotatory power generated during rapid gear rotation.
3Reliability
If the sprag stopper part height is increased to prevent contact, then the sprag is protected, but the sprag contact part and parking cam pipe part may collide
Solution Approach 1:
The patent optimizes the height parameter of the sprag stopper part to achieve the precise balance needed: it is tall enough to prevent the sprag from contacting the parking rod cam part, yet short enough to allow the sprag contact part to clear the parking cam pipe part without collision. This precise parameter control resolves the contradiction between protection and collision prevention.
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 solution prevents damage to the parking rod part and ensures normal operation by geometrically robust design and line contact structure, allowing the parking apparatus to function without deforming other components during parking and release states.
Implementation Method 1
a parking rod cam part mounted on an end of the parking rod body part and configured to come into contact with the sprag part and move the sprag part up and down
Implementation Method 2
a sprag part configured to come into contact with the parking rod part and to move up and down in response to the movement of the parking rod part
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A parking apparatus for a vehicle includes a driving part, a detent lever part connected to a central axis of the driving part and rotated in response to a rotation of the central axis, a parking rod part moved in a straight line in response to the rotation of the detent lever part, a sprag part configured to come into contact with the parking rod part and to move up and down in response to the movement of the parking rod part, and a parking gear part disposed over the sprag part, geared by the rise of the sprag part, and configured to have it rotation restricted.