Transverse Gear Locking Mechanism for Vehicle Transmission Shift Rods
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Solution Overview
Problem
Existing motor vehicle transmission shifting arrangements require complex gear locking mechanisms to prevent simultaneous engagement of multiple gears, which can increase axial space requirements and complicate assembly, while also being difficult to implement and weigh heavily.
Innovation Solution
A shifting arrangement with a mechanical gear locking system that uses a blocking element movably mounted in a transverse guide section, allowing only one shift rod to assume a gear position at a time, featuring a through-opening in the first shift rod for the blocking element and a stop element to prevent backout, enabling easy assembly and reduced weight without additional axial length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical gear locking mechanism is used to prevent simultaneous engagement of multiple gears, then gear engagement safety is improved, but device complexity and weight increase
Solution Approach 1:
The locking mechanism is segmented into modular components: locking elements that can be individually positioned, guide sections that provide structured movement paths, and stop elements that define positioning limits. This segmentation allows the complex locking function to be achieved through simple, standardized parts rather than a monolithic complex mechanism.
Solution Approach 2:
Guide sections act as intermediaries between the locking elements and the shift rods, providing a structured path that enables the locking elements to engage and disengage smoothly. This intermediary structure simplifies the interaction between components while ensuring reliable locking functionality.
2Reliability
If a mechanical gear locking mechanism is used to prevent simultaneous engagement of multiple gears, then gear engagement safety is improved, but weight increases
Solution Approach 1:
The locking elements are designed as simple, lightweight components that can be easily manufactured and replaced if needed. Rather than using heavy-duty permanent locking structures, the patent employs simple pin-like elements that fulfill the locking function with minimal weight while maintaining reliability through proper geometric design.
Solution Approach 2:
Instead of using heavy locking elements that actively engage with the shift rods, the mechanism uses stop elements and guide sections that passively define the movement limits. The locking function is achieved through the geometry of the guide sections and stop elements rather than through active heavy-duty locking components.
3Reliability
If existing gear locking mechanisms are used, then gear engagement safety is improved, but assembly becomes more difficult
Solution Approach 1:
The guide sections are pre-formed with integrated stop elements and recesses that automatically guide the locking elements into their correct positions during assembly. This preliminary structuring of the guide sections eliminates the need for complex alignment procedures and ensures that components self-assemble in the correct configuration.
Solution Approach 2:
The locking elements are designed to nest within the guide sections, with the guide sections containing recesses that receive the locking elements. This nested arrangement allows compact packaging of components and simplifies assembly by enabling components to be inserted into predetermined positions within the housing.
4Reliability
If locking mechanisms are located at axial ends of shift rods, then gear engagement safety is improved, but axial installation space increases
Solution Approach 1:
The locking mechanism transitions from axial positioning (at the ends of shift rods) to transverse positioning (within guide sections perpendicular to the shift rod axis). This dimensional change allows the locking function to be achieved within the radial space of the transmission housing rather than requiring additional axial length.
Solution Approach 2:
The guide sections are merged with the housing structure, integrating the locking mechanism into the existing housing rather than adding separate axial extension components. This merging allows the locking elements to be positioned transversely within the housing volume, eliminating the need for additional axial installation space.
Data Source
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AI summary
Shift arrangement (50) for a motor vehicle transmission (16) with a plurality of gears (G1-G8), wherein the gears (G1-G8) can be engaged and disengaged by means of the shift arrangement (50), with a housing (54) defining a longitudinal direction (52), with a first and a second shift rod (46, 70) arranged parallel to each other and each mounted to be movable in the longitudinal direction (52) with respect to the housing (54), such that each shift rod (46, 70) has a neutral position (N) and at least one gear position (G2, G4;G6, G8), and with a mechanical gear locking arrangement (80) that acts between the shift rods (46, 70) so that only one of the shift rods (46, 70) can assume a gear position at any given time, wherein the gear shifting arrangement (80) has a locking element (82) that is movably mounted in a transverse guide section (84) with respect to the housing (54) in a direction (86) transverse to the longitudinal direction (52), wherein the locking element (82) is movably mounted between a first locking position (S1) in which movement of the first shift rod (46) out of its neutral position (N) is blocked, and a second locking position (S2) in which movement of the second shift rod (70) out of its neutral position (N) is blocked. In this case, at least the first switching rod (46) has a through-opening (92) whose through-opening cross-section (94) is adapted to a locking element cross-section (96) of the locking element (82).