Claw-Type Gearshift Blocking Ring for Low-Noise Speed Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Claw-type gearshifts in vehicles experience vibrations and noise due to rotational speed differences during engagement of coupling elements, leading to increased wear and noise generation.
Innovation Solution
A claw-type gearshift design incorporating a sliding sleeve, a clutch body, and a blocking ring with axially resilient tabs and a friction surface, which prevents the sliding sleeve from striking the clutch body at high differential speeds, allowing engagement only after speed adaptation, thus reducing noise and wear. The blocking ring is fixed to the hub body and rotates between release and locking positions based on frictional connections, eliminating the need for thrust pieces and reducing axial installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sliding sleeve engages directly with the clutch body at high rotational speed differences, then the gearshift can be actuated quickly, but vibrations and noise occur during engagement
Solution Approach 1:
The blocking ring serves as an intermediary element between the sliding sleeve and the clutch body. It prevents direct engagement at high speed differences by blocking the sliding sleeve's path, allowing speed adaptation to occur first through the friction connection with the hub body, thereby eliminating vibrations and noise during engagement
2Reliability
If the blocking ring is designed with thrust pieces on the hub body to enable active return to release position, then the blocking ring can be reliably reset, but the axial installation space increases
Solution Approach 1:
The blocking ring resets itself automatically through the friction connection with the hub body. When the clutch body and hub body have different rotational speeds, the friction force causes the blocking ring to rotate back to the release position without requiring external thrust pieces or active return mechanisms, thereby maintaining compact axial dimensions
3Object-affected harmful factors
If the blocking ring uses permanent frictional connection with the clutch body for speed adaptation, then noise generation and wear are reduced, but the device complexity increases
Solution Approach 1:
The blocking ring performs multiple functions: it blocks the sliding sleeve during high speed differences, enables speed adaptation through friction connection with the hub body, and automatically resets to the release position. This multi-functionality is achieved within a relatively simple ring structure with tabs, avoiding the need for separate mechanisms for each function
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
Significantly reduces noise generation and component wear by ensuring the sliding sleeve engages with the clutch body only after speed adaptation, minimizing axial installation space and manufacturing costs while maintaining effective locking and frictional forces.
Implementation Method 1
a plurality of axially resilient tabs which are directed radially inward and which bear against the hub body and limit the movement of the blocking ring in relation to the hub body in the circumferential direction
Implementation Method 2
a ring portion which is arranged radially outside of the resilient tabs and which includes a friction surface that rests permanently against a mating friction surface on the clutch body
Data Source
AI summary
A claw-type gearshift includes a sliding sleeve and a clutch body of a speed change gear, in which the sliding sleeve can engage. A blocking ring having an external toothing is arranged axially between the hub body and the clutch body and is fixed to the hub body such that it is rotatable in relation to the sliding sleeve by a certain degree in the circumferential direction between a release position and two locking positions. The blocking ring has a plurality of axially resilient tabs which are directed radially inward and which bear against the hub body and limit the movement of the blocking ring relative to the hub body in the circumferential direction, and a ring portion which is arranged radially outside of the tabs and which includes a friction surface that rests permanently against a mating friction surface on the clutch body.