Vehicle Transfer Compactness via Integrated Drum Cam
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Solution Overview
Problem
Conventional vehicle transfer systems are large due to the need for a long distance between the output shaft and fork shaft to prevent interference between the high/low switching mechanism and clutch, limiting downsizing opportunities.
Innovation Solution
A transfer system with a ball cam and drum cam configuration where the drum cam is integrated with the output shaft, allowing for a shorter distance between the output shaft and fork shaft, and utilizing a spherical rolling element and inclined recess grooves to transmit motion efficiently, eliminating the need for a separate drum cam on the fork shaft and reducing the size of the transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the output shaft and fork shaft is increased to prevent interference between the high/low switching mechanism and clutch, then the interference is avoided, but the transfer size increases
Solution Approach 1:
The patent repositions the drum cam from the fork shaft to the output shaft, changing the spatial arrangement of components. This dimensional reconfiguration allows the high/low switching mechanism and clutch to be arranged without requiring excessive distance between the output shaft and fork shaft, thus preventing interference while maintaining compact size.
Solution Approach 2:
The output shaft is given multiple functions: it serves as both the output shaft for power transmission and as the mounting shaft for the drum cam. This multi-functionality eliminates the need for separate mounting locations that would increase the overall transfer size, allowing compact arrangement of components.
2Volume of moving object
If the distance between the output shaft and fork shaft is reduced for downsizing, then the transfer size decreases, but interference between the high/low switching mechanism and clutch occurs
Solution Approach 1:
By moving the drum cam to the output shaft and reconfiguring the spatial relationships between components in different dimensions, the patent enables shorter distance between output shaft and fork shaft without causing interference between mechanisms.
3Ease of operation
If a separate drum cam is provided on the fork shaft for high/low switching, then the switching mechanism operates independently, but the transfer size increases
Solution Approach 1:
The output shaft performs dual functions as both the power output shaft and the mounting shaft for the drum cam. This integration reduces the number of separate components and their mounting locations, enabling compact transfer design while maintaining independent operation of the high/low switching mechanism.
Solution Approach 2:
The patent merges the drum cam mounting function with the output shaft, combining two functions into a single component. This merging eliminates the need for a separate drum cam on the fork shaft, reducing overall transfer size while preserving switching operation capability.
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 enables a more compact transfer design by reducing the distance between the output shaft and fork shaft, enhancing responsiveness and allowing for continuous variable torque control, thereby improving driving force distribution and system efficiency.
Implementation Method 1
a ball cam including a first annular member, and a second annular member positioned on the clutch side, the first annular member and the second annular member being each supported on the output shaft so as to be rotatable relative to the output shaft, including respective inclined recess grooves formed in surfaces facing each other and being prevented from moving in the common axis direction, and a spherical rolling element housed in the inclined recess grooves of the first annular member and the second annular member
Implementation Method 2
including respective inclined recess grooves formed in surfaces facing each other
Implementation Method 3
a drum cam including a cam groove formed in an outer peripheral portion, the cam groove engaging with the cam engagement member, being connected to either of the first annular member and the second annular member and pivoting around the common axis to move the cam engagement member to the axis direction of the fork shaft
Data Source
AI summary
A drum cam is connected to a first annular member in a ball cam provided on a rear wheel-side output shaft. Furthermore, linear motion of a second annular member in the ball cam provided on the rear wheel-side output shaft is transmitted to a front wheel-driving clutch via a first transmission mechanism.