Gear Case Rib Structure to Reduce Hydraulic Stirring Resistance
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Solution Overview
Problem
Existing driving force transmission devices face increased stirring resistance due to hydraulic fluid leakage between the case and baffle plate, which can be costly to mitigate with seal members and compromise assemblability.
Innovation Solution
Incorporating a rib protruding from the case towards the baffle plate with a linear portion crossing the rotation direction of the gear, reducing the clearance between the case and baffle plate, thereby minimizing hydraulic fluid flow and preventing increased stirring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a seal member is disposed in the clearance between the case and the baffle plate to prevent hydraulic fluid leakage, then the stirring resistance of the gear is reduced, but the manufacturing cost increases and assemblability deteriorates
Solution Approach 1:
The invention extracts the sealing function from a separate seal member and integrates it into the baffle plate structure itself. The inclined surface on the baffle plate creates a self-sealing effect that prevents hydraulic fluid leakage without requiring additional seal components, thereby reducing manufacturing cost and improving assemblability while maintaining low stirring resistance
Solution Approach 2:
The baffle plate structure performs multiple functions including flow guidance and self-sealing. The inclined surface automatically prevents hydraulic fluid from passing through the clearance between the case and baffle plate during operation, eliminating the need for external sealing mechanisms and reducing overall system complexity
2Ease of operation
If the clearance between the case and the baffle plate is large, then the assemblability is improved, but the amount of hydraulic fluid flowing into the gear side increases and stirring resistance increases
Solution Approach 1:
The baffle plate features a localized inclined surface at the specific region where hydraulic fluid leakage occurs. This local structural modification creates effective sealing at the critical clearance area while maintaining a larger overall clearance for ease of assembly, thus resolving the contradiction between assemblability and stirring resistance
Solution Approach 2:
The invention addresses the clearance issue by adding a dimensional element - the inclined surface angle - to the baffle plate structure. This angular dimension creates a self-sealing effect that prevents fluid leakage even with larger clearances, transforming a one-dimensional clearance problem into a two-dimensional solution involving both clearance size and surface angle
Data Source
AI summary
A driving force transmission device includes: a gear; a case receiving the gear; a baffle plate positioned between a side surface of the gear and the case, the baffle plate including a downstream side end portion positioned at a most downstream position in a rotation direction of the gear, the case including a rib protruding toward the downstream side end portion, a clearance positioned between a surface of the rib and a surface of the baffle plate, the rib including a linear portion crossing a rotation direction of the gear.