Claw-Type Gearshift Blocking Ring for Low-Noise Shifting
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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 featuring a sliding sleeve, a clutch body, and a blocking ring with conical friction surfaces, where the blocking ring prevents the sliding sleeve from engaging with the clutch body until rotational speed synchronization, reducing noise and wear by ensuring high frictional force and preventing the blocking ring from returning to its release position without active assistance, utilizing a separate speed adaption mechanism and elastic properties for self-return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sliding sleeve engages directly with the clutch body during speed difference, then the gearshift can be shifted, but vibrations and noise occur due to rotational speed differences
Solution Approach 1:
A blocking ring is introduced as an intermediary component between the sliding sleeve and the clutch body. The blocking ring has blocking ring teeth that can block the engagement between sliding sleeve teeth and clutch body teeth when rotational speed differences exist. The blocking ring includes conical friction surfaces that enable speed adaptation through friction, allowing the system to shift gears only when speeds are synchronized, thereby eliminating noise and vibration caused by direct engagement during speed difference.
2Object-affected harmful factors
If the blocking ring prevents engagement during speed difference, then noise and wear are reduced, but the device complexity increases due to additional components
Solution Approach 1:
The blocking ring is designed to perform multiple functions within a single component: (1) It acts as a blocking mechanism with blocking ring teeth to prevent engagement during speed difference; (2) It provides speed adaptation through conical friction surfaces that enable rotational speed synchronization; (3) It serves as a form-locking blockade to prevent axial displacement of the sliding sleeve. By combining these functions in one component, the patent reduces the need for separate synchronizer rings and blocking mechanisms, thereby limiting the increase in device complexity.
3Strength
If the blocking ring teeth and sliding sleeve teeth are formed with flattened axial ends, then the blocking ring cannot be actively returned to release position, but the force components in circumferential direction are minimized
Solution Approach 1:
The blocking ring is designed to return to its release position automatically through self-service mechanisms rather than active forcing. The conical friction surfaces create frictional forces that, combined with the elastic deformation of the blocking ring during engagement, enable the blocking ring to rotate back to the release position when the sliding sleeve returns. The flattened axial ends of the blocking ring teeth and sliding sleeve teeth minimize lateral force components, allowing the elastic recovery and frictional forces to naturally return the blocking ring without requiring additional active return mechanisms.
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 correct switching and high frictional force dominance, allowing for low-noise and low-wear shifting with reduced material thickness and axial installation space, as the blocking ring returns to its release position through rotational speed changes rather than active force.
Implementation Method 1
The friction surface on the blocking ring and the mating friction surface on the clutch body have a conical shape. The conical friction surfaces of the blocking ring and the clutch body result in a high frictional force, which can be easily adjusted such that it predominates over frictional forces between the sliding sleeve teeth and the blocking ring teeth in the locking position.
Implementation Method 2
allowing for low-noise and low-wear shifting with reduced material thickness and axial installation space, as the blocking ring returns to its release position through rotational speed changes rather than active force.
Data Source
AI summary
In a claw-type gearshift, a blocking ring is arranged axially between a hub body having a sliding sleeve and a clutch body such that it is rotatable between a release position and two locking positions. The blocking ring is adapted to be displaced toward the clutch body until conical friction surfaces on the blocking ring and on the clutch body come into contact. The blocking ring constitutes a form-locking blockade for the sliding sleeve against displacement of the sliding sleeve teeth between the clutch body teeth when an axial shifting force is applied in the non-synchronized state. When the claw clutch is shifted, a difference in speed between the clutch body and the hub body is reduced and the sliding sleeve is deflected in the axial direction toward the speed change gear to be shifted, as a result of which a friction surface of the blocking ring and a mating friction surface of the clutch body come into contact.