Compact Multi-Speed Shift Assembly for Work Vehicles
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Solution Overview
Problem
Existing drive assemblies for work vehicles, such as motor graders, face challenges in achieving multiple speeds while maintaining a compact size and reducing manufacturing costs and weight, particularly due to the complexity of gear trains and shifting assemblies that occupy significant axial space.
Innovation Solution
A compact drive assembly with a shifting assembly that includes a gear set and brake arrangement, where the brake components are positioned within the wheel bearing support, allowing for independent rotation of gears and enabling multiple speed modes by selectively braking specific gears, thereby reducing the axial dimension and simplifying the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex gear trains and shifting assemblies are used to achieve multiple speeds, then speed variability is improved, but axial dimension and device complexity increase
Solution Approach 1:
The drive assembly is segmented into independent gear sets (first gear set, second gear set) that can operate independently, allowing speed selection through discrete gear engagement rather than complex continuous shifting mechanisms. This segmentation enables multiple speed modes while maintaining a compact axial footprint.
Solution Approach 2:
The patent employs nested gear arrangements where gear sets are positioned concentrically or in overlapping configurations. The first and second gear sets are arranged to share space efficiently, with gears nested within the axial envelope of the housing, thereby achieving multiple speeds without increasing axial dimension.
2Adaptability or versatility
If complex gear trains and shifting assemblies are used to achieve multiple speeds, then speed variability is improved, but device complexity increases
Solution Approach 1:
The shifting mechanism is divided into independent brake components (first brake component, second brake component) that selectively engage with specific gears. This segmentation simplifies the control logic and mechanical complexity compared to traditional multi-component shifting assemblies, as each brake component independently controls a specific gear engagement state.
Solution Approach 2:
The patent replaces complex mechanical shifting mechanisms with a brake-based selection system. Instead of using multiple clutch packs and complex linkage mechanisms to engage/disengage gears, the invention uses brake components to selectively lock or release specific gears, thereby achieving speed variation with simpler mechanical means.
3Ease of manufacture
If motors are operated at higher speeds to reduce cost of motors and inverters, then motor cost is reduced, but drive assembly size and cost increase due to higher gear ratios required
Solution Approach 1:
The drive assembly uses segmented gear sets with different ratio ranges. The first gear set provides a first range of ratios while the second gear set provides a second range, allowing the motor to operate at optimized speeds for each range. This segmentation enables the use of smaller, less expensive motors by distributing the ratio requirements across multiple gear sets rather than requiring one large motor with extremely high reduction ratios.
Solution Approach 2:
The patent implements dynamic gear ratio selection through the brake component system, which can switch between different gear sets based on operating conditions. This dynamic adaptability allows the drive assembly to optimize the gear ratio for each operating regime, enabling smaller motors to be used effectively across a wider speed range without requiring oversized components to handle the maximum ratio requirements in all conditions.
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 achieves a compact form factor, reducing the axial dimension of the drive assembly while providing multiple speed modes, improving manufacturing efficiency and reducing the overall size and weight, making it suitable for use in various work vehicles.
Implementation Method 1
the first brake component brakes the first gear of the gear set with respect to the drive housing... the second brake component brakes the second gear of the gear set with respect to the drive housing
Data Source
AI summary
A drive assembly includes a drive housing, a bearing-mounted wheel mount configured to rotate about a rotation axis with respect to the drive housing, and a shift assembly coupled between an input shaft and the wheel mount to selectably cause rotation of the wheel mount various rotational speeds. The shift assembly includes a gear set and a brake arrangement. The gear set has a first gear and a second gear, each being rotatable by the input shaft independent of the other. The brake arrangement has a first brake component and a second brake component. During rotation of the wheel mount at a first rotational speed, the first brake component brakes the first gear with respect to the drive housing. During rotation of the wheel mount at a second rotational speed, the second brake component brakes the second gear with respect to the drive housing.