Synchronizer Blocking Key Direct Contact Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing synchronizing devices for double clutch transmissions increase the number of elements and device length due to the presence of an indexing key, leading to higher manufacturing costs and dispersed synchronous force as the blocking key does not directly contact the clutch hub.
Innovation Solution
A synchronizing device design where the blocking key directly contacts the clutch hub, eliminating the need for an indexing key and incorporating a blocker ring with a receiving portion to enhance synchronous force, reducing the number of elements and device length, and preventing vibration or clearance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an indexing key is used to guide movement of the blocking key, then the blocking key can be guided during operation, but the number of elements and device length increase
Solution Approach 1:
The indexing key and blocker ring are merged into a single integrated component. The blocker ring directly incorporates the indexing function through its interaction with the blocking key, eliminating the need for a separate indexing key component while maintaining the guidance function during operation.
Solution Approach 2:
The blocker ring is designed to perform multiple functions simultaneously: it acts as both the synchronizing element that engages with the clutch hub and the indexing mechanism that guides the blocking key movement. This multi-functionality reduces the overall number of components required in the system.
2Ease of operation
If an indexing key is used to guide movement of the blocking key, then the blocking key can be guided during operation, but the device length increases
Solution Approach 1:
The indexing key and blocker ring are merged into a single integrated component. The blocker ring directly incorporates the indexing function through its interaction with the blocking key, eliminating the need for a separate indexing key component while maintaining the guidance function during operation.
Solution Approach 2:
The guidance function is transitioned from a separate axial component (indexing key) to a radial interaction between the blocker ring and blocking key. This dimensional change allows the indexing function to be achieved within the existing radial space of the synchronizer assembly, reducing axial length.
3Ease of operation
If the blocking key does not directly contact the clutch hub, then the blocking key can move freely, but the synchronous force is dispersed
Solution Approach 1:
The indexing function is extracted from the blocking key-clutch hub interaction and assigned to the blocker ring. This allows the blocking key to maintain direct contact with the clutch hub for force transmission while the blocker ring provides the necessary guidance and indexing function through a separate mechanism.
Solution Approach 2:
The blocker ring acts as an intermediary element that provides guidance to the blocking key without interfering with the direct force transmission between the blocking key and clutch hub. The blocking key guide portions on the blocker ring mediate the movement guidance while allowing full force contact.
Data Source
AI summary
A synchronizing device for transmission including a clutch hub disposed to a shaft and a plurality of clutch hub groove formed thereto, a sleeve splined and connected to an external side of the clutch hub for being capable of moving along axial direction of the shaft, a blocking key disposed to the clutch hub groove, and a clutch gear disposed coaxial to the shaft may include a blocker ring disposed to touch a cone portion formed to the clutch gear, wherein a blocking key locking portion may be formed to the clutch hub for an upper external circumference of the blocking key to contact thereto, and a receiving portion for supporting the blocking key may be formed to the blocker ring.