Electro-Hydraulic Lift-Tip Device for Waste Vehicles
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Solution Overview
Problem
Existing lifting and tilting devices for waste collection vehicles require a connection to the hydraulic system of the vehicle, complicating installation and maintenance, and leading to unnecessary weight and cost due to oversized hydraulic systems.
Innovation Solution
A lifting and tilting device with an electro-hydraulic drive system that includes a pump operated by an electric motor, a pressure accumulator, and check valves, allowing the hydraulic system to be self-contained and only connected electrically to the vehicle, reducing the need for a direct hydraulic connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lifting and tilting device is connected to the hydraulic system of the refuse collection vehicle, then the hydraulic consumers can be supplied with hydraulic fluid, but the installation and maintenance become more complex and the system weight increases
Solution Approach 1:
The hydraulic system is extracted from the vehicle's central hydraulic system and made self-contained on the lifting and tilting device. The device carries its own hydraulic pump, tank, and distribution system, eliminating the need for external hydraulic connections while maintaining reliable hydraulic fluid supply to all consumers
Solution Approach 2:
A hydraulic distribution manifold acts as an intermediary component, receiving hydraulic fluid from the pump and distributing it to multiple consumers (pallet truck, restraint device, locking device, chute) through separate controllable connections, simplifying the overall system architecture
2Reliability
If the hydraulic system is connected to the vehicle's hydraulic system, then hydraulic consumers can be supplied, but the system weight and cost increase due to oversized hydraulic systems
Solution Approach 1:
The hydraulic system is designed with local quality by sizing components according to the actual needs of each hydraulic consumer rather than being constrained by the vehicle's centralized hydraulic system. The pump, tank, and distribution lines are optimized for the specific flow rates and pressures required by the pallet truck, restraint device, locking device, and chute
Solution Approach 2:
The hydraulic system is extracted from the vehicle's central system and made self-contained, allowing the lifting and tilting device to carry only the hydraulic components it actually needs, significantly reducing the overall hydraulic system weight and cost
3Reliability
If the pump operates continuously to supply hydraulic fluid, then the hydraulic consumers are always supplied, but energy consumption increases
Solution Approach 1:
The pump operates periodically rather than continuously, activating only when hydraulic fluid is needed by the consumers. The system uses pressure sensors and control logic to determine when the pump should run, maintaining reliable hydraulic supply while minimizing energy consumption during periods when no hydraulic action is required
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 simplifies installation and maintenance, reduces weight and cost by allowing the hydraulic system to be tailored to specific needs, and conserves energy by only operating the pump during demand peaks, while ensuring continuous hydraulic fluid supply to consumers.
Implementation Method 1
the electro-hydraulic drive system has a pump (4) which is operated by an electric drive (5) and has a tank (6) for the hydraulic fluid
Implementation Method 2
the electro-hydraulic drive system has a pressure accumulator (7) which can be filled with hydraulic fluid by the pump (4)
Data Source
Figure 1
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AI summary
The invention relates to a lifting and tipping device (1) for a waste collection vehicle with at least one electric drive (2, 5), at least one electrically driven lifting platform, and at least one hydraulically operated consumer (9, 10), characterized in that the at least one hydraulically operated consumer (9, 10) is supplied with hydraulic fluid by an electro-hydraulic drive system (3), wherein the electro-hydraulic drive system (3) comprises a pump (4) which is driven by an electric drive (5), and a tank (6) for the hydraulic fluid. The invention further relates to a waste collection vehicle with such a lifting and tipping device. Advantageously, the invention makes it possible to forego a connection between the lifting and tipping device and the hydraulic system of the waste collection vehicle.