Planetary Transmission Brake Layout for High-Speed Heavy Vehicles
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Solution Overview
Problem
Existing brake systems in agricultural and heavy load vehicles fail to provide a fixed operating brake at high vehicle speeds and increased sizes, leading to inefficiencies and potential damage from high circumferential speeds.
Innovation Solution
A brake device is positioned between the planet carrier and the output drive element, such as a ring gear, allowing for a larger brake design that can absorb energy during braking, with a direct force flow and reduced circumferential speeds, and can function as both a holding and operating brake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a brake device is placed closer to the rotational axis of the drive shaft, then the brake device can be more compact, but the circumferential speeds in the brake device increase leading to excessive energy and heat generation
Solution Approach 1:
The brake device is positioned radially outward from the planetary gearset, utilizing the space between the planet carrier and ring gear. This radial displacement moves the brake from a central location to a peripheral location, increasing the effective braking radius and reducing circumferential speed while maintaining compact overall transmission dimensions.
2Adaptability or versatility
If a brake device is placed between planet carriers and the output drive element, then the brake can function as both holding and operating brake, but the structural complexity increases
Solution Approach 1:
The brake device is designed to perform multiple functions: it acts as a holding brake to prevent unintended movement when the vehicle is stationary, and as an operating brake to control vehicle speed during operation. The same brake mechanism and positioning achieve both functions, eliminating the need for separate holding and operating brake systems.
Solution Approach 2:
The brake device is integrated into the planetary gearset structure by positioning it between the planet carrier and ring gear. This merging of the brake system with the existing transmission components achieves multi-functionality while minimizing additional structural complexity.
3Speed
If the brake device is positioned further from the rotational axis, then the circumferential speeds are reduced, but the brake device requires more space
Solution Approach 1:
The solution utilizes the radial dimension of the transmission housing, positioning the brake device in the annular space between the planet carrier and ring gear. This allows the brake to operate at a larger radius with reduced circumferential speed while fitting within the existing transmission envelope without requiring additional external space.
4Reliability
If a holding brake is designed to actuate in the initial position without pressure, then safety is improved, but the actuating mechanism complexity increases
Solution Approach 1:
The holding brake is designed with inverted logic: instead of requiring pressure application to activate the brake, the brake is spring-loaded to engage automatically in the initial position and requires pressure only to release. This inversion ensures that any failure of the pressure system defaults to the safe braked state, improving reliability while using a simple spring-actuated mechanism.
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 brake device effectively stops the vehicle during braking, reduces wear and tear, and maintains operational efficiency even in failure scenarios, while providing a compact and cost-effective solution for high-power applications.
Implementation Method 1
The brake device preferably comprises a multiple disk brake, inner disks of which are non-rotatably connected to the planet carrier, and the out disks of which are connected to the output drive element for conjoint rotation therewith
Implementation Method 2
The heat can be discharged through the brake fluid, or by the connection of the brake to the ring gear or planet carrier
Implementation Method 3
The heat can be discharged through the brake fluid
Data Source
AI summary
A transmission for an agricultural or heavy load vehicle is provided, and includes a central drive shaft, at least one planetary gearset comprising a planet carrier, at least one output drive element, and one brake device. The drive shaft is connected to the output drive element via the planetary gearset. The brake device is located between the planet carrier and the output drive element in the form of a ring gear, such that the output drive element can be coupled to the planet carrier via the brake device.