Composite Planetary Transmission Common Axis Design
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Solution Overview
Problem
Existing speed changing transmission apparatuses face challenges in achieving smooth and compact design, particularly in synthesizing outputs from engine drive forces and electric motor drive forces without speed changing actions, and in minimizing structural projections to enhance compactness and reduce speed changing shocks during range transcending operations.
Innovation Solution
A speed changing transmission apparatus with a composite planetary transmission section, including a clutch section, a speed-reducing planetary transmission mechanism, and an output clutch mechanism, arranged to rotate about a common axis, allowing for the elimination of structural projections and enabling smooth speed changing operations across multiple speed ranges with reduced shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clutch mechanisms and planetary transmission mechanisms are arranged separately, then the transmission apparatus can achieve multiple speed ranges, but the structural projections increase and compactness is reduced
Solution Approach 1:
The patent combines multiple clutch mechanisms (first clutch C11, second clutch C12, third clutch C13, fourth clutch C14) and planetary transmission mechanisms (first planetary mechanism U1, second planetary mechanism U2, third planetary mechanism U3) into a integrated composite planetary transmission section where they share common carriers and rotational members. The input side rotational members of the clutches are arranged to rotate about a common axis, eliminating the need for separate housings and support structures, thereby reducing structural projections while maintaining multiple speed range functionality.
Solution Approach 2:
The common carrier 44 serves multiple functions by supporting planet gears of both the first planetary transmission mechanism U1 and the second planetary transmission mechanism U2 simultaneously. The input side rotational members serve dual purposes as both clutch input members and transmission element support shafts, allowing a single structural component to perform multiple functions and reduce overall structural complexity.
2Ease of operation
If conventional clutch mechanisms are used with separate operable coupling mechanisms, then speed changing operations can be performed, but speed changing shocks occur during range transcending
Solution Approach 1:
The patent arranges the input side rotational members of the clutch mechanisms to rotate about a common axis beforehand, establishing a shared rotational platform. This preliminary arrangement allows for coordinated engagement and disengagement of multiple clutches during range transcending operations, enabling smoother transition between speed ranges by pre-establishing the mechanical relationship between different transmission paths.
Solution Approach 2:
The common carrier 44 acts as an intermediary element that mediates the interaction between different planetary transmission mechanisms and clutch mechanisms. By providing a shared support structure, it enables coordinated operation of multiple clutches during range transcending, reducing shock by distributing the load transition across multiple engagement points rather than single-point engagement.
3Reliability
If separate support structures are used for each transmission mechanism, then reliable operation is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the support structures for multiple planetary transmission mechanisms into a single common carrier 44 that supports all planet gears. This consolidation reduces the number of separate support structures from multiple individual carriers to one shared carrier, simplifying the overall device structure while maintaining reliable operation through proper load distribution and unified support.
Solution Approach 2:
The common carrier 44 is designed as a universal support structure that performs multiple functions: supporting planet gears of the first planetary mechanism U1, supporting planet gears of the second planetary mechanism U2, and serving as a rotational member for clutch mechanisms. This multi-functional design reduces device complexity by eliminating redundant support structures while ensuring reliable operation through centralized support.
Data Source
AI summary
A composite planetary transmission section (P) is provided for synthesizing output from a stepless speed changing section (20) with an engine drive force. In a transmission line from the planetary transmission section (P) to an output rotational body (90), there are provided first clutch mechanism (60), a second clutch mechanism (70), a speed-reducing planetary transmission mechanism (80), an operable coupling clutch mechanism (110) and an output clutch mechanism (120). A ring gear (83) of the speed-reducing planetary transmission mechanism (80) includes a brake mechanism (100). A sun gear (43) of the planetary transmission section (P), an input side rotational member (62) of the first clutch mechanism (60), an input side rotational member (71) of the second clutch mechanism (70), a sun gear (84) of the speed-reducing planetary transmission mechanism (80), and an input side rotational member (122) of the output clutch mechanism (120) are rotatable about a common rotational axis. A rotational shaft (97) operably coupling a carrier (44) of the composite planetary transmission section (P) with the output rotational body (90) is inserted through a planetary transmission mechanism (50) of the composite planetary transmission section (P), the first clutch mechanism (60), the second clutch mechanism (70) and the speed-reducing planetary transmission mechanism (80).