Speed Differential Device for Overrunning Clutch
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Solution Overview
Problem
Existing speed differential devices for vehicles face issues with reduced bearing ability and strength, leading to potential wheel locking during transient acceleration, deceleration, and gear reduction, especially in two and four-wheel structures, and require complex structures with increased cost and weight to prevent these issues.
Innovation Solution
A speed differential device for a common double overrunning clutch featuring a cam installed on the output ring, combined left and right input units with rolling post retainers and returning springs, a damping unit, and a claw control ring interacting with an external power unit to prevent wheel locking and enhance bearing ability, suitable for both two and four-wheel structures, including engine braking functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cam is installed on the power input unit of a clutch, then the strength of the outer ring is improved, but the bearing ability of the outer ring is reduced
Solution Approach 1:
The clutch is divided into separate left and right halves, each with its own cam unit (101, 201) installed on independent power input units (1, 2). This segmentation allows each half to bear loads independently, preventing the bearing ability reduction that would occur in a single integrated structure. The left and right clutch halves operate semi-independently while maintaining synchronized control through the claw control ring.
Solution Approach 2:
A claw control ring (7) is introduced as an intermediary component to control the synchronous action of left and right claws (5, 6). This mediator ensures that both sides of the clutch operate in coordination, allowing the cam units to reinforce each other's strength while the bearing loads are distributed across multiple contact points, thus maintaining bearing ability while improving overall strength.
2Reliability
If left and right rolling posts are disposed in the speed differential device, then wheel locking can be prevented, but the structure becomes complicated, cost increases, weight increases, and assembly time increases
Solution Approach 1:
The left and right rolling posts (3A, 4A) are merged into a unified speed differential device structure where they work together through shared components. The left rolling post retainer (3) and right rolling post retainer (4) are integrated with common returning springs (30, 40) that interact with a single clutch unit. This merging reduces the overall complexity compared to having completely separate left and right systems, while still preventing wheel locking through the coordinated action of both rolling posts.
Solution Approach 2:
The clutch unit serves multiple functions: it controls both the left and right rolling posts simultaneously, manages the returning springs for both sides, and prevents wheel locking for both wheels. This multi-functionality reduces the need for separate control mechanisms for each side, thereby simplifying the overall structure while maintaining the reliability of preventing wheel locking.
3Reliability
If the speed differential structure uses a cam to prevent locking during transient acceleration and deceleration, then safety is improved, but the structure becomes more complex
Solution Approach 1:
The cam units (101, 201) are merged into the left and right power input units (1, 2) respectively, forming an integrated speed differential device. This unified structure allows the cams to work together in preventing locking during transient conditions, while the shared clutch unit and claw control ring coordinate their action to maintain safety without requiring separate complex control systems for each side.
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 provides a safer, simpler, and more robust speed differential device that prevents wheel locking during transient movements, supports both two and four-wheel configurations, and offers engine braking functionality while maintaining a lightweight and cost-effective design.
Implementation Method 1
an inner annular surface of an outer of a power input unit of a clutch is installed with a cam which not only affect the strength of an outer ring thereof, but also reduce the bearing ability of the outer ring
Implementation Method 2
the left rolling post retainer (3) being installed with a left returning spring (30); the right rolling post retainer (4) being installed with a right returning spring (40); the left returning spring (30) and the right returning spring (40) being interacted with a clutch unit
Implementation Method 3
A speed differential device for a common double overrunning clutch featuring a cam installed on the output ring, combined left and right input units with rolling post retainers and returning springs, a damping unit
Data Source
AI summary
A speed differential device for a common double overrunning clutch includes a left input unit and a right input unit being combined together as a combination structure; a left input unit 1 with a cam unit and a right output unit with a cam unit being installed with the combination structure of the left input unit and the right input unit; a left rolling post retainer and a plurality of left rolling posts being installed between the left input unit and the left output ring; a right rolling post retainer and a plurality of right rolling posts being installed between the right input unit and the right output unit; the left rolling post retainer being installed with a left returning spring; the right rolling post retainer being installed with a right returning spring; the left returning spring and the right returning spring being interacted with a clutch unit.