Integrated Transmission Gear Shifting Assembly With Shared Drive Cam
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Solution Overview
Problem
Current gear shifting assemblies in automobiles are complex, leading to high manufacturing costs, increased risk of oil leakage, power loss, and maintenance issues, with existing solutions either relying on hydraulic systems or motor control, which are not efficient or reliable.
Innovation Solution
A gear shifting assembly that integrates a P-gear mechanism and forward-gear mechanism with a common drive mechanism, utilizing a P-gear cam and gear shifting cam on the transmission shaft with specifically designed curved surfaces to allow simultaneous operation without interference, reducing energy consumption and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydraulic system is used for gear shifting among forward gears and P gear, then gear shifting can be achieved, but the structure becomes complicated and manufacturing cost increases due to addition of high-pressure oil pump, actuating piston, and complicated oil path system
Solution Approach 1:
The patent replaces the hydraulic control system with a direct mechanical control system. The shift lever directly drives the shift fork through mechanical connection, eliminating the need for hydraulic components such as high-pressure oil pump, actuating piston, and complex oil paths. This mechanical substitution resolves the technical contradiction by achieving gear shifting function while dramatically simplifying the overall structure.
2Ease of operation
If a hydraulic system is used for gear shifting, then gear shifting can be achieved, but the risk of oil leakage increases and reliability deteriorates
Solution Approach 1:
By replacing the hydraulic system with a direct mechanical control system, the patent eliminates oil leakage risks entirely. The mechanical connection between shift lever and shift fork does not involve seals or fluid pathways, thereby fundamentally resolving the reliability issue associated with hydraulic systems.
3Ease of operation
If a hydraulic system is used for gear shifting, then gear shifting can be achieved, but additional power loss increases and maintenance costs rise
Solution Approach 1:
The mechanical control system eliminates the high-pressure oil pump and hydraulic fluid circulation required in hydraulic systems. This substitution removes the parasitic power losses associated with hydraulic fluid pumping, pressure maintenance, and leakage, thereby reducing overall power loss and maintenance requirements.
4Ease of operation
If separate motors are used to control shifting among forward gears and parking at P gear, then gear shifting can be achieved, but the structure becomes complicated and space occupied increases
Solution Approach 1:
The patent merges the control functions for forward gear shifting and P gear parking into a single integrated mechanical system. The shift lever and its associated shift fork simultaneously control both the forward gear selection and the parking gear engagement, eliminating the need for separate motors and their control systems. This merging principle resolves the contradiction by achieving full gear shifting functionality while reducing structural complexity.
5Ease of operation
If the cam is axially provided at one side of the shifting hub opposite to the gear engaging side, then the gear engaging function can be achieved, but the structure becomes complex and occupies more space in axial direction
Solution Approach 1:
The patent repositions the cam from the axial direction to the radial direction of the transmission shaft. Instead of placing the cam axially at one side of the shifting hub, the cam is now arranged radially on the transmission shaft, with its profile controlling the shift fork movement. This dimensional change allows the gear engaging function to be achieved while significantly reducing the axial length and compacting the overall structure.
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
The solution enables compact, efficient, and reliable gear shifting and parking functions, reducing the complexity and cost of the assembly while minimizing energy consumption and enhancing reliability by using a single drive motor and elastic assemblies for axial compensation.
Implementation Method 1
both ends of the gear shifting cam are respectively provided with an elastic assembly, the elastic assemblies are fixed to the transmission shaft and have a set pre-tightening force for pre-compressing the gear shifting cam
Implementation Method 2
the elastic assemblies have a set pre-tightening force in the axial direction of the transmission shaft so that the gear shifting cam is always fixed to the transmission shaft when the gear shifting cam moves to any position within a set range
Data Source
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AI summary
The present disclosure relates to the field of automobiles, and in particular to a gear shifting assembly of a transmission, a transmission, and an automobile. The present disclosure aims to address the problem of complicated structure existing in a gear shifting assembly or the like. To this end, the gear shifting assembly of a transmission according to the present disclosure includes a P-gear mechanism and a forward-gear mechanism, wherein the gear shifting assembly further includes a drive mechanism and a shifting mechanism, and the shifting mechanism is configured to be capable of switching the drive mechanism so that the P-gear mechanism or the forward-gear mechanism is in an operational state. By employing the common drive mechanism, the gear-shifting function of forward gears and the function of parking at the P-gear can be realized without interference, and on the basis of function integration, elements are saved so that the gear shifting assembly is made more compact in structure.