Differential Shift Clutch with Stationary Parts and Coupling Links
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Solution Overview
Problem
Existing differential arrangements for motor vehicle drive axles have complex and expensive designs due to axially movable coupling elements that are subject to high mechanical stress, making them costly and difficult to produce.
Innovation Solution
A differential arrangement with a shift clutch that includes a first and second clutch part connected to the differential gear and input part, respectively, and at least six coupling elements that are displaceable relative to these parts, allowing torque transmission and disconnection without moving the coupling parts, using a switching element to shift between closed and open states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axially movable clutch parts are used to transmit and interrupt torque, then torque transmission can be controlled, but the design becomes complex and production costs increase due to high mechanical stress
Solution Approach 1:
The clutch is segmented into multiple coupling links (at least six) that distribute the torque load. Each coupling link is a separate element that can be individually designed and positioned, transforming a single complex movable clutch part into multiple simpler elements working in parallel.
Solution Approach 2:
Instead of making the clutch parts themselves movable to engage and disengage, the invention uses displaceable coupling members that can be inserted into or removed from recesses in the clutch parts. This inverts the approach: the clutch parts remain stationary while the coupling members provide the movable engagement function.
2Ease of operation
If axially movable clutch parts are actuated to control torque transmission, then shifting functionality is achieved, but mechanical stress and design intricacies increase
Solution Approach 1:
The torque transmission path is segmented into multiple coupling links, each bearing a portion of the total torque load. This segmentation reduces the mechanical stress on any single coupling link and on the clutch parts themselves, while maintaining full shifting functionality through the collective action of all coupling links.
Solution Approach 2:
The actuation mechanism displaces coupling members along their axes rather than moving the entire clutch parts axially. This inverted approach reduces the mechanical stress on the clutch parts by keeping them stationary, while still achieving complete torque transmission control through the displacement of the coupling members into and out of engagement positions.
3Device complexity
If coupling members are made displaceable relative to clutch parts, then torque transmission is simplified, but manufacturing precision requirements increase
Solution Approach 1:
Rather than requiring precise manufacturing of movable clutch parts, the invention uses stationary clutch parts with recesses and displaceable coupling members. The precision requirement is shifted to the positioning of coupling members relative to the recesses, which can be achieved through simpler manufacturing processes for the clutch parts themselves while using tolerances and guidance features for the coupling members.
Data Source
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AI summary
Differential assembly, in particular for a drive axle of a motor vehicle. The differential assembly comprises a drive wheel; a differential gear with an input part; a shift clutch effectively arranged between the drive wheel and the differential gear, wherein, in the closed state of the shift clutch, torque is transmitted from the drive wheel to the differential gear, and in the open state of the shift clutch, torque transmission is interrupted. A first clutch part of the shift clutch is rigidly connected to the input part or to a differential housing of the differential gear, and a second clutch part of the shift clutch is rigidly connected to the other part of the input part and the differential housing, respectively.