Hydrodynamic Transmission for Construction Vehicle Shock Load Absorption
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Solution Overview
Problem
Self-propelled construction machines face overloading issues with drive motors and structures when encountering hard materials due to high shock loads, which can lead to stalling of internal combustion engines.
Innovation Solution
The implementation of a hydrodynamic transmission system with a control device that regulates the speed difference between the drive and output shafts, allowing for a predetermined slip, thereby reducing the risk of overloading and absorbing shock loads, and enabling operation with a certain slip in the hydrodynamic gear during maximum load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the milling or cutting drum is driven at high power to remove material efficiently, then productivity increases, but the drive motor and structure become overloaded by shock loads when encountering hard material
Solution Approach 1:
A hydrodynamic transmission element (fluid coupling or torque converter) is introduced as an intermediary between the drive motor and the milling drum. This intermediary uses fluid dynamics to transmit torque, automatically limiting peak loads through hydrodynamic effects while maintaining high average power transmission for productivity. The fluid coupling absorbs shock loads when the drum encounters hard material, preventing motor overload while sustaining efficient material removal during normal operation.
2Device complexity
If a conventional clutch is used to switch off the working unit, then the structure becomes simpler, but wear and tear increases and shock loads are not absorbed
Solution Approach 1:
The patent replaces mechanical clutch elements with a hydrodynamic transmission system using fluid couplings or torque converters. This hydraulic approach transmits power through rotating fluid, eliminating direct mechanical contact between engagement components. The result is elimination of wear from clutch plates and friction surfaces, while the fluid's compressibility and hydrodynamic characteristics naturally absorb shock loads during engagement and operation.
3Power
If the internal combustion engine operates at high speed to provide sufficient power, then power output increases, but the engine stalls when overloaded
Solution Approach 1:
The hydrodynamic transmission element serves as a protective intermediary between the internal combustion engine and the high-load milling drum. When the drum encounters hard material causing overload, the fluid coupling limits torque transmission to the drum, preventing excessive load on the engine. This allows the engine to maintain higher operating speeds for power output while the hydrodynamic element prevents stalling by automatically slippage under peak load 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
This solution prevents overloading of the internal combustion engine and reduces shock loads, ensuring stable operation by adjusting the drive power and feed rate to maintain optimal torque and speed settings, even when encountering hard materials.
Implementation Method 1
the transmission system for transmitting the drive power from the drive unit (5) to the working unit (4), which comprises at least one working unit, does not have a conventional clutch with which the working unit (4) can be switched on, but has a hydrodynamic transmission (10) which has a drive shaft (10A) and an output shaft (10B)
Data Source
AI summary
The machine has landing gears (1) that comprise wheels or chain drive assemblies (1A,1B). A primary power transmission strand transmits driving power of a drive unit (5) on wheels or chain drive assemblies to control the transferred power. A secondary power transmission strand transmits the driving power of the drive unit on a working unit (4). A regulating device controls transferred power over the primary power transmission strand such that the rotation speed difference between the drive shaft and driven shaft of a hydrodynamic gear box corresponds to a given value. An independent claim is included for method for controlling self-propelled construction machine.