Nested Cam-Type Damper for Compact Vehicle Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle transmission structures with cam-type torque dampers have a large distance between bearings, leading to increased size of the gear shift shaft, which complicates the fixing structure and increases the overall size of the transmission.
Innovation Solution
A vehicle transmission structure with a cam-type damper that includes a drive-side cam member on the drive shaft and a driven-side cam member on the driven shaft, both incapable of relative rotation, where the cam members are positioned using a biasing unit and annular protrusions to restrict axial movement, simplifying the fixing structure and reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cam-type torque damper is disposed over the whole interval between a pair of bearings, then the torque damper can effectively absorb rotational torque, but the distance between bearings becomes large and the size of the gear shift shaft increases
Solution Approach 1:
The driven shaft is rotatably supported inside the drive shaft, forming a nested configuration. The cam members are disposed within the nested shaft structure, allowing the torque damper to function effectively within a compact axial space without increasing the overall gear shift shaft length
Solution Approach 2:
The invention transitions from a conventional linear arrangement where cam members span the entire bearing interval to a nested radial arrangement where the driven shaft is positioned inside the drive shaft. This dimensional reorganization allows the cam-type torque damper to maintain its torque absorption capability while significantly reducing the axial length of the gear shift shaft
2Stability of the object's composition
If the cam members are fixed to shaft ends with long interval between bearings, then the torque damper structure is stable, but the fixing structure becomes complex and the overall size increases
Solution Approach 1:
By nesting the driven shaft inside the drive shaft and positioning cam members within this nested structure, the fixing structure is simplified. The cam members are retained between the nested shafts and bearing structures, eliminating the need for complex external fixation mechanisms while maintaining stability
Solution Approach 2:
The invention combines multiple functions into the nested shaft structure: the drive shaft and driven shaft serve both as structural support elements and as part of the torque transmission path. The cam members integrate torque damping functionality into the existing shaft assembly, reducing the need for separate fixation components
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 configuration simplifies the positioning of cam members, restricts axial movement, and effectively absorbs relative positional deviations, thereby suppressing the increase in size of the gear shift shaft and maintaining transmission efficiency.
Implementation Method 1
one cam member (132) of the drive-side cam member (131) and the driven-side cam member (132) is positioned by being pressed against an end surface (103h) of the annular protrusion part (103d) with the intermediary of the other cam member (131) by a biasing unit (134)
Implementation Method 2
a cam-type damper (118) that is provided between the drive shaft (114) and the driven shaft (103) and is capable of absorbing relative positional deviation in the rotational direction between the drive shaft (114) and the driven shaft (103) due to rotational torque received from the drive shaft (114)
Data Source
AI summary
A cam-type damper 118 includes a drive cam 131 provided on a clutch shaft 114 without capability of relative rotation and a driven cam 132 provided on a main shaft 103 without capability of relative rotation. The clutch shaft 114 contains a shaft end of the main shaft 103 and the main shaft 103 is rotatably supported on the inner circumferential surface of the clutch shaft 114. The driven cam 132 provided on the main shaft 103 is disposed between a front end surface 114g of the clutch shaft 114 and a rear end surface 103h of a main shaft gear 103d provided on the main shaft 103 and the movement of the driven cam 132 in the axial direction is restricted.