Bevel Gear System With Non-Concurrent Axes For Mass Reduction
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Solution Overview
Problem
Conventional mechanical systems for transmitting rotational movement between shafts using bevel gears and accessory pinions require concurrent axes of rotation, limiting the adaptability of the reduction ratio and increasing the number of mechanical parts, which results in higher mass and cost without ensuring optimal longevity and reliability.
Innovation Solution
A mechanical system with a bevel gear and an accessory pinion featuring conical primitive surfaces that allow for non-concurrent axes of rotation, enabling efficient torque transmission with reduced power consumption and eliminating the need for additional speed reduction components by varying the shape and orientation of the teeth and axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axes of rotation are arranged to be concurrent to limit slippage and wear between teeth, then the reliability is improved, but the device complexity increases and adaptability decreases
Solution Approach 1:
The invention changes the geometric parameters of the gear system by allowing non-concurrent axes of rotation. The accessory pinion's axis is positioned at a distance from the common vertex S of the bevel gear, creating a offset configuration. This parameter change enables direct adaptation of reduction ratios without additional components while maintaining tooth meshing integrity through modified primitive operating surfaces.
2Adaptability or versatility
If additional means are used to adapt reduction ratio, then the adaptability is improved, but the device complexity and mass increase
Solution Approach 1:
The invention introduces a movable accessory pinion that can be positioned at different distances from the common vertex S along the direction perpendicular to the second axis. This dynamic positioning capability allows continuous variation of the reduction ratio without requiring additional fixed components or complex mechanisms, directly achieving adaptability while minimizing part count.
3Adaptability or versatility
If additional bevel gears are used to modify shaft orientation, then the adaptability is improved, but the mass and cost increase
Solution Approach 1:
The accessory pinion serves multiple functions simultaneously: it transmits rotational movement from the bevel wheel to a third shaft, adapts the reduction ratio through variable positioning, and modifies the orientation of the output shaft. This multi-functionality eliminates the need for separate orientation-modifying components, reducing overall system mass and cost.
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 reduces the mass and cost of the mechanical system while maintaining reliability, allowing for direct speed reduction and adapting the reduction ratio without increasing the number of parts, with power consumption via the accessory pinion being significantly lower than through the bevel wheel.
Implementation Method 1
a bevel gear consisting of a first bevel gear provided with teeth movable in rotation about the first axis and a bevel gear provided with teeth movable in rotation about the second axis, the respective teeth of the first bevel pinion and of the bevel wheel being capable of cooperating in a complementary manner with each other
Implementation Method 2
By definition, such first and second primitive operating surfaces then roll without sliding on each other during the operation of such a bevel gear
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
The present invention relates to a mechanical system (4) for transmitting rotational motion between at least two shafts (10) and (20) rotatable respectively about a first axis (11) and a second axis (21), said first and second axes (11) and (21) being concurrent with each other, said mechanical system (4) comprising a bevel gear (7) composed of a first bevel pinion (12) provided with teeth (13), rotatable about said first axis (11) and a bevel wheel (22) provided with teeth (23), rotatable about said second axis (21), said teeth (13) and (23) respectively of said first bevel pinion (12) and said bevel wheel (22) being adapted to cooperate in a complementary manner with each other, said first bevel pinion (12), referred to as the "power pinion", having a first primitive surface of definition (14) of conical shape, said bevel wheel (22) exhibiting a second primitive surface of definition (24) of conical shape.