Conical-Tooth Spur Gear Differential With Integrated Blocking
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Solution Overview
Problem
Spur gear differentials are costly to produce and require significant constructional space, particularly due to the complexity of their toothing and the need for additional devices to achieve a blocking effect, which complicates manufacturing and increases size.
Innovation Solution
The implementation of conical toothing on at least one of the output spur gears and/or planet gears, allowing for a rotational movement to be converted into a further movement that creates a blocking effect, thereby reducing the need for additional devices and simplifying production by minimizing post-processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spur gear differentials are used with standard toothing, then manufacturing requires multiple post-processing steps and tight tolerances, but production costs increase and manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the gear toothing by using conical toothing instead of cylindrical toothing. This parameter change allows the gears to self-align during operation, reducing the need for tight manufacturing tolerances and minimizing post-processing steps while maintaining functional precision
Solution Approach 2:
The conical toothing design allows the gears to dynamically adjust their contact pattern during rotation. The gears automatically find their optimal engagement position through the conical geometry, reducing sensitivity to manufacturing variations and eliminating the need for precise pre-alignment
2Reliability
If additional devices are added to achieve blocking effect in spur gear differentials, then blocking function is improved, but constructional space increases and device complexity increases
Solution Approach 1:
The patent merges the blocking function with the existing conical toothing structure. The same conical gears that enable differential motion also provide the blocking effect through their geometric configuration, eliminating the need for separate locking mechanisms and reducing overall device complexity
Solution Approach 2:
The conical toothing serves multiple functions simultaneously: it enables differential motion between the output gears and provides the blocking effect when needed. This multi-functionality reduces the number of components required and simplifies the overall differential design
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 design achieves a blocking effect efficiently with a compact design, reducing production costs and complexity, as the conical toothing enables a frictional force to be generated that retards rotational speed, effectively managing differential speed differences without the need for additional components.
Implementation Method 1
at least one (or all) of the output spur gears and/or of the planet gears is conically toothed in such a way that, when the planet gears rotate relative to one another, the at least one of the output spur gears and/or of the planet gears is moved into a position
Implementation Method 2
the conical toothing enables a frictional force to be generated that retards rotational speed, effectively managing differential speed differences
Data Source
AI summary
The invention relates to a spur gear differential (1), in particular for motor vehicles, comprising a planet carrier (2) for circulating about a differential axis (X), a first output spur gear (3), which is arranged coaxially to the differential axis (X), a second output spur gear (4), which is likewise arranged coaxially to the differential axis (X), and at least one pair (5) of planet gears (6, 7) that mesh with one another, said pair being rotatably arranged in the planet carrier (2), each planet gear (6, 7) meshing with one output spur gear (3, 4). At least one of the output spur gears (3, 4) and/or of the planet gears (6, 7) is conically toothed in such a way that, when the planet gears (6, 7) rotate relative to one another, the at least one of the output spur gears (3, 4) and/or of the planet gears (6, 7) is moved into a position in which a blocking effect is brought about. The invention further relates to a corresponding method for producing a spur gear differential (1) of this type.