Axle Drive System with Non-Unity Intermediate Gear Ratio
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Solution Overview
Problem
Existing axle drive systems for commercial vehicles with multiple driven axles face acoustic disadvantages, load-bearing capability issues, and inefficient installation space utilization due to identical tip circle diameters and transmission ratios, leading to permanent rotational speed differences and reduced service life.
Innovation Solution
The proposed axle drive system features an intermediate gear stage with a non-unity transmission ratio, ensuring unequal numbers of teeth for the intermediate pinion and gear, which distributes stress evenly and prevents constant meshing, combined with bevel gear stages that maintain overall transmission ratios, eliminating permanent rotational speed differences and optimizing installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a transmission ratio of i=1.0 is used in the intermediate gear stage, then the installation space is reduced and the structure is simplified, but acoustic disadvantages and load-bearing capability disadvantages occur
Solution Approach 1:
The patent changes the transmission ratio parameter from i=1.0 to i≠1.0 in the intermediate gear stage. This parameter change resolves the contradiction by improving load-bearing capability and acoustic properties while maintaining a compact design through optimized gear dimensions and tooth distribution.
2Volume of moving object
If identical tip circle diameters of intermediate gears are used, then the installation space is optimized, but acoustic disadvantages and load-bearing capability disadvantages occur
Solution Approach 1:
The patent modifies the gear parameters by using different tip circle diameters for the intermediate gears. This change eliminates the harmful acoustic effects caused by identical diameters while maintaining space efficiency through careful dimensional optimization of the gear components.
3Reliability
If a transmission ratio of i≠1.0 is used in the intermediate gear stage, then acoustic properties and load-bearing capability are improved, but permanent rotational speed differences occur in the longitudinal differential
Solution Approach 1:
The patent introduces asymmetry in the gear configuration by using different transmission ratios in the intermediate gear stage. This asymmetric design improves load distribution and acoustic properties while the overall symmetric arrangement of the drive axles maintains rotational speed balance.
Solution Approach 2:
The patent carefully selects specific parameter values for the intermediate gears with i≠1.0 to achieve optimal load-bearing capability and acoustic performance. The parameters are chosen such that the permanent rotational speed differences are minimized and do not adversely affect the longitudinal differential operation.
4Ease of manufacture
If intermediate gears with identical diameters and tooth numbers are used, then the manufacturing is simplified, but acoustic disadvantages and load-bearing capability disadvantages occur
Solution Approach 1:
The patent changes the gear parameters from identical diameters and tooth numbers to different values. This parameter modification eliminates the harmful acoustic effects and improves load-bearing capability while maintaining manufacturing feasibility through standardized production processes for non-identical gear 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 design enhances acoustic properties, load-bearing capability, and installation space utilization by distributing stress evenly across teeth and preventing permanent rotational speed differences, thereby increasing service life and reducing noise during operation.
Implementation Method 1
The first drive axle has an intermediate gear stage with an intermediate pinion and an intermediate gear
Implementation Method 2
a first bevel gear stage with a bevel pinion and a ring gear
Data Source
AI summary
An axle drive system for a motor vehicle, in particular a commercial vehicle, has a drive unit. The axle drive apparatus also has a first drive axle for drive-connecting to the drive unit. The first drive axle has a first intermediate gear stage and a first bevel gear stage. The axle drive system also has a second drive axle which is drive-connected to the first drive axle. A transmission ratio of the first intermediate gear stage is not equal to 1. A transmission ratio of the first drive axle, in particular a common transmission ratio of the first intermediate gear stage and the first bevel gear stage, corresponds to a transmission ratio of the second drive axle.