Claw-Type Gearshift Locking Structure for Low-Noise Engagement
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Solution Overview
Problem
Claw-type gearshifts in vehicles often experience vibrations and noise during gear engagement due to rotational speed differences between coupling elements.
Innovation Solution
The claw-type gearshift incorporates thrust pieces with friction surfaces that cooperate with mating friction surfaces on the clutch body, allowing the sliding sleeve to engage only after speed adaptation, thereby reducing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a claw-type gearshift is used for speed change, then the structure is simplified compared to synchronized gearshifts, but vibrations and noise occur during engagement due to rotational speed differences
Solution Approach 1:
The thrust piece performs preliminary action by equalizing rotational speeds between the hub body and clutch body before the sliding sleeve engages the clutch body. The friction surface on the thrust piece contacts the clutch body to reduce speed difference, preventing vibrations and noise during subsequent engagement while maintaining the simplified claw-type structure
2Device complexity
If the sliding sleeve directly engages the clutch body without speed adaptation, then the structure is simpler, but noise generation and component wear increase
Solution Approach 1:
The thrust piece acts as an intermediary element between the sliding sleeve and clutch body. It mediates the speed difference through frictional contact, allowing the sliding sleeve to engage the clutch body smoothly without direct high-speed differential contact, thereby reducing noise and wear while keeping the structure simple
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
This solution effectively reduces noise generation and component wear by ensuring synchronized speed before engagement, without the need for a synchronizer ring or blocking ring.
Implementation Method 1
at least one thrust piece (23) which is coupled to the sliding sleeve (20) and includes a friction surface (42) that cooperates with a mating friction surface (44) on the clutch body (14)
Data Source
AI summary
A claw-type gearshift has a sliding sleeve which is adapted to be axially displaced on a hub body and a clutch body of a speed change gear. The hub body has at least one thrust piece arranged thereon which includes a friction surface that cooperates with a mating friction surface on the clutch body, the at least one thrust piece being displaceable in the circumferential direction between a release position and two locking positions that are located on either side of the release position. A first locking structure on the at least one thrust piece cooperates with a second locking structure on the internal toothing of the sliding sleeve. The locking structures are configured such that in each of the locking positions, the locking structures rest against each other such that a further axial movement of the sliding sleeve is blocked. For shifting a gear, a difference in speed between the clutch body and the hub body is reduced.